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curve</title> <meta name="description" content="Search results for: growth curve"> <meta name="keywords" content="growth curve"> <meta name="viewport" content="width=device-width, initial-scale=1, minimum-scale=1, maximum-scale=1, user-scalable=no"> <meta charset="utf-8"> <link href="https://cdn.waset.org/favicon.ico" type="image/x-icon" rel="shortcut icon"> <link href="https://cdn.waset.org/static/plugins/bootstrap-4.2.1/css/bootstrap.min.css" rel="stylesheet"> <link href="https://cdn.waset.org/static/plugins/fontawesome/css/all.min.css" rel="stylesheet"> <link href="https://cdn.waset.org/static/css/site.css?v=150220211555" rel="stylesheet"> </head> <body> <header> <div class="container"> <nav class="navbar navbar-expand-lg navbar-light"> <a class="navbar-brand" href="https://waset.org"> <img src="https://cdn.waset.org/static/images/wasetc.png" alt="Open Science Research Excellence" title="Open Science Research Excellence" /> </a> <button class="d-block d-lg-none navbar-toggler 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id="custom-search-input"> <div class="input-group"> <i class="fas fa-search"></i> <input type="text" class="search-query" name="q" placeholder="Author, Title, Abstract, Keywords" value="growth curve"> <input type="submit" class="btn_search" value="Search"> </div> </div> </form> </div> </div> <div class="row mt-3"> <div class="col-sm-3"> <div class="card"> <div class="card-body"><strong>Commenced</strong> in January 2007</div> </div> </div> <div class="col-sm-3"> <div class="card"> <div class="card-body"><strong>Frequency:</strong> Monthly</div> </div> </div> <div class="col-sm-3"> <div class="card"> <div class="card-body"><strong>Edition:</strong> International</div> </div> </div> <div class="col-sm-3"> <div class="card"> <div class="card-body"><strong>Paper Count:</strong> 7378</div> </div> </div> </div> <h1 class="mt-3 mb-3 text-center" style="font-size:1.6rem;">Search results for: growth curve</h1> <div class="card paper-listing mb-3 mt-3"> <h5 class="card-header" style="font-size:.9rem"><span class="badge badge-info">7378</span> The Growth Curve of Gompertz Model in Body Weight of Slovak Mixed-Sex Goose Breeds</h5> <div class="card-body"> <p class="card-text"><strong>Authors:</strong> <a href="https://publications.waset.org/abstracts/search?q=Cyril%20Hrncar">Cyril Hrncar</a>, <a href="https://publications.waset.org/abstracts/search?q=Jozef%20Bujko"> Jozef Bujko</a>, <a href="https://publications.waset.org/abstracts/search?q=Widya%20P.%20B.%20Putra"> Widya P. B. Putra</a> </p> <p class="card-text"><strong>Abstract:</strong></p> The growth curve of poultry is important to evaluate the farming management system. This study was aimed to estimate the growth curve of body weight in goose. The growth curve in this study was estimated with non-linear Gompertz model through CurveExpert 1.4. software. Three Slovak mixed-sex goose breeds of Landes (L), Pomeranian (P) and Steinbacher (S) were used in this study. Total of 28 geese (10 L, 8 P and 10 S) were used to estimate the growth curve. Research showed that the asymptotic weight (A) in those geese were reached of 5332.51 g (L), 6186.14 g (P) and 5048.27 g (S). Thus, the maturing rate (k) in each breed were similar (0.05 g/day). The weight of inflection was reached of 1960.48 g (L), 2274.32 g (P) and 1855.98 g (S). The time of inflection (ti) was reached of 25.6 days (L), 26.2 days (P) and 27.80 days (S). The maximum growth rate (MGR) was reached of 98.02 g/day (L), 113.72 g/day (P) and 92.80 g/day (S). Hence, the coefficient of determination (R2) in Gompertz model was 0.99 for each breed. It can be concluded that Pomeranian geese had highest of growth trait than the other breeds. <p class="card-text"><strong>Keywords:</strong> <a href="https://publications.waset.org/abstracts/search?q=body%20weight" title="body weight">body weight</a>, <a href="https://publications.waset.org/abstracts/search?q=growth%20curve" title=" growth curve"> growth curve</a>, <a href="https://publications.waset.org/abstracts/search?q=inflection" title=" inflection"> inflection</a>, <a href="https://publications.waset.org/abstracts/search?q=Slovak%20geese" title=" Slovak geese"> Slovak geese</a>, <a href="https://publications.waset.org/abstracts/search?q=Gompertz%20model" title=" Gompertz model"> Gompertz model</a> </p> <a href="https://publications.waset.org/abstracts/129511/the-growth-curve-of-gompertz-model-in-body-weight-of-slovak-mixed-sex-goose-breeds" class="btn btn-primary btn-sm">Procedia</a> <a href="https://publications.waset.org/abstracts/129511.pdf" target="_blank" class="btn btn-primary btn-sm">PDF</a> <span class="bg-info text-light px-1 py-1 float-right rounded"> Downloads <span class="badge badge-light">147</span> </span> </div> </div> <div class="card paper-listing mb-3 mt-3"> <h5 class="card-header" style="font-size:.9rem"><span class="badge badge-info">7377</span> Comparison of the Distillation Curve Obtained Experimentally with the Curve Extrapolated by a Commercial Simulator</h5> <div class="card-body"> <p class="card-text"><strong>Authors:</strong> <a href="https://publications.waset.org/abstracts/search?q=L%C3%ADvia%20B.%20Meirelles">Lívia B. Meirelles</a>, <a href="https://publications.waset.org/abstracts/search?q=Erika%20C.%20A.%20N.%20Chrisman"> Erika C. A. N. Chrisman</a>, <a href="https://publications.waset.org/abstracts/search?q=Fl%C3%A1via%20B.%20de%20Andrade"> Flávia B. de Andrade</a>, <a href="https://publications.waset.org/abstracts/search?q=Lilian%20C.%20M.%20de%20Oliveira"> Lilian C. M. de Oliveira</a> </p> <p class="card-text"><strong>Abstract:</strong></p> True Boiling Point distillation (TBP) is one of the most common experimental techniques for the determination of petroleum properties. This curve provides information about the performance of petroleum in terms of its cuts. The experiment is performed in a few days. Techniques are used to determine the properties faster with a software that calculates the distillation curve when a little information about crude oil is known. In order to evaluate the accuracy of distillation curve prediction, eight points of the TBP curve and specific gravity curve (348 K and 523 K) were inserted into the HYSYS Oil Manager, and the extended curve was evaluated up to 748 K. The methods were able to predict the curve with the accuracy of 0.6%-9.2% error (Software X ASTM), 0.2%-5.1% error (Software X Spaltrohr). <p class="card-text"><strong>Keywords:</strong> <a href="https://publications.waset.org/abstracts/search?q=distillation%20curve" title="distillation curve">distillation curve</a>, <a href="https://publications.waset.org/abstracts/search?q=petroleum%20distillation" title=" petroleum distillation"> petroleum distillation</a>, <a href="https://publications.waset.org/abstracts/search?q=simulation" title=" simulation"> simulation</a>, <a href="https://publications.waset.org/abstracts/search?q=true%20boiling%20point%20curve" title=" true boiling point curve"> true boiling point curve</a> </p> <a href="https://publications.waset.org/abstracts/68293/comparison-of-the-distillation-curve-obtained-experimentally-with-the-curve-extrapolated-by-a-commercial-simulator" class="btn btn-primary btn-sm">Procedia</a> <a href="https://publications.waset.org/abstracts/68293.pdf" target="_blank" class="btn btn-primary btn-sm">PDF</a> <span class="bg-info text-light px-1 py-1 float-right rounded"> Downloads <span class="badge badge-light">442</span> </span> </div> </div> <div class="card paper-listing mb-3 mt-3"> <h5 class="card-header" style="font-size:.9rem"><span class="badge badge-info">7376</span> Economic Growth and Transport Carbon Dioxide Emissions in New Zealand: A Co-Integration Analysis of the Environmental Kuznets Curve</h5> <div class="card-body"> <p class="card-text"><strong>Authors:</strong> <a href="https://publications.waset.org/abstracts/search?q=Mingyue%20Sheng">Mingyue Sheng</a>, <a href="https://publications.waset.org/abstracts/search?q=Basil%20Sharp"> Basil Sharp</a> </p> <p class="card-text"><strong>Abstract:</strong></p> Greenhouse gas (GHG) emissions from national transport account for the largest share of emissions from energy use in New Zealand. Whether the environmental Kuznets curve (EKC) relationship exists between environmental degradation indicators from the transport sector and economic growth in New Zealand remains unclear. This paper aims at exploring the causality relationship between CO₂ emissions from the transport sector, fossil fuel consumption, and the Gross Domestic Product (GDP) per capita in New Zealand, using annual data for the period 1977 to 2013. First, conventional unit root tests (Augmented Dickey–Fuller and Phillips–Perron tests), and a unit root test with the breakpoint (Zivot-Andrews test) are employed to examine the stationarity of the variables. Second, the autoregressive distributed lag (ARDL) bounds test for co-integration, followed by Granger causality investigated causality among the variables. Empirical results of the study reveal that, in the short run, there is a unidirectional causality between economic growth and transport CO₂ emissions with direction from economic growth to transport CO₂ emissions, as well as a bidirectional causality from transport CO₂ emissions to road energy consumption. <p class="card-text"><strong>Keywords:</strong> <a href="https://publications.waset.org/abstracts/search?q=economic%20growth" title="economic growth">economic growth</a>, <a href="https://publications.waset.org/abstracts/search?q=transport%20carbon%20dioxide%20emissions" title=" transport carbon dioxide emissions"> transport carbon dioxide emissions</a>, <a href="https://publications.waset.org/abstracts/search?q=environmental%20Kuznets%20curve" title=" environmental Kuznets curve"> environmental Kuznets curve</a>, <a href="https://publications.waset.org/abstracts/search?q=causality" title=" causality"> causality</a> </p> <a href="https://publications.waset.org/abstracts/92763/economic-growth-and-transport-carbon-dioxide-emissions-in-new-zealand-a-co-integration-analysis-of-the-environmental-kuznets-curve" class="btn btn-primary btn-sm">Procedia</a> <a href="https://publications.waset.org/abstracts/92763.pdf" target="_blank" class="btn btn-primary btn-sm">PDF</a> <span class="bg-info text-light px-1 py-1 float-right rounded"> Downloads <span class="badge badge-light">300</span> </span> </div> </div> <div class="card paper-listing mb-3 mt-3"> <h5 class="card-header" style="font-size:.9rem"><span class="badge badge-info">7375</span> Approximating Maximum Speed on Road from Curvature Information of Bezier Curve</h5> <div class="card-body"> <p class="card-text"><strong>Authors:</strong> <a href="https://publications.waset.org/abstracts/search?q=M.%20Yushalify%20Misro">M. Yushalify Misro</a>, <a href="https://publications.waset.org/abstracts/search?q=Ahmad%20Ramli"> Ahmad Ramli</a>, <a href="https://publications.waset.org/abstracts/search?q=Jamaludin%20M.%20Ali"> Jamaludin M. Ali</a> </p> <p class="card-text"><strong>Abstract:</strong></p> Bezier curves have useful properties for path generation problem, for instance, it can generate the reference trajectory for vehicles to satisfy the path constraints. Both algorithms join cubic Bezier curve segment smoothly to generate the path. Some of the useful properties of Bezier are curvature. In mathematics, the curvature is the amount by which a geometric object deviates from being flat, or straight in the case of a line. Another extrinsic example of curvature is a circle, where the curvature is equal to the reciprocal of its radius at any point on the circle. The smaller the radius, the higher the curvature thus the vehicle needs to bend sharply. In this study, we use Bezier curve to fit highway-like curve. We use the different approach to finding the best approximation for the curve so that it will resemble highway-like curve. We compute curvature value by analytical differentiation of the Bezier Curve. We will then compute the maximum speed for driving using the curvature information obtained. Our research works on some assumptions; first the Bezier curve estimates the real shape of the curve which can be verified visually. Even, though, the fitting process of Bezier curve does not interpolate exactly on the curve of interest, we believe that the estimation of speed is acceptable. We verified our result with the manual calculation of the curvature from the map. <p class="card-text"><strong>Keywords:</strong> <a href="https://publications.waset.org/abstracts/search?q=speed%20estimation" title="speed estimation">speed estimation</a>, <a href="https://publications.waset.org/abstracts/search?q=path%20constraints" title=" path constraints"> path constraints</a>, <a href="https://publications.waset.org/abstracts/search?q=reference%20trajectory" title=" reference trajectory"> reference trajectory</a>, <a href="https://publications.waset.org/abstracts/search?q=Bezier%20curve" title=" Bezier curve"> Bezier curve</a> </p> <a href="https://publications.waset.org/abstracts/36228/approximating-maximum-speed-on-road-from-curvature-information-of-bezier-curve" class="btn btn-primary btn-sm">Procedia</a> <a href="https://publications.waset.org/abstracts/36228.pdf" target="_blank" class="btn btn-primary btn-sm">PDF</a> <span class="bg-info text-light px-1 py-1 float-right rounded"> Downloads <span class="badge badge-light">375</span> </span> </div> </div> <div class="card paper-listing mb-3 mt-3"> <h5 class="card-header" style="font-size:.9rem"><span class="badge badge-info">7374</span> Lactation Curve at Holstein Cows in Romania and Influencing Factors</h5> <div class="card-body"> <p class="card-text"><strong>Authors:</strong> <a href="https://publications.waset.org/abstracts/search?q=Enea%20Danut%20Nicolae">Enea Danut Nicolae</a>, <a href="https://publications.waset.org/abstracts/search?q=Osman%20%28Defta%29%20Aurelia"> Osman (Defta) Aurelia</a>, <a href="https://publications.waset.org/abstracts/search?q=Vidu%20Livia"> Vidu Livia</a>, <a href="https://publications.waset.org/abstracts/search?q=Marginean%20Gheorghe"> Marginean Gheorghe</a>, <a href="https://publications.waset.org/abstracts/search?q=Defta%20Nicoleta"> Defta Nicoleta</a>, <a href="https://publications.waset.org/abstracts/search?q=Moise%20Andrada"> Moise Andrada</a> </p> <p class="card-text"><strong>Abstract:</strong></p> Today, as a result of population growth, there is an increase in demand for animal products; milk and dairy products are an important part of this category. Maintaining production at maximum levels for as long as possible is one of the main objectives of dairy farmers. Over the course of lactation, a cow's milk production is not uniform. During the initial stage of lactation, the cow's milk production follows an upward slope, a plateau, and then a downward slope, which is a reflection of the lactation curve. The evolution of the lactation curve is influenced by numerous factors, which are genetic, exploitation, physiological, environmental and technological. The aim of this study was to observe the lactation curve of Holstein cows in Romania and determine the extent to which they conform to the expected pattern. In addition, there has been an analysis of the factors which have an influence on this curve and the extent of this influence. In order to be able to carry out the present study, data were collected from three farms located in three different geographical areas. To highlight the findings, the data collected was then statistically processed and graphically interpreted. All the farms have only Holstein cows, which are kept in free stalls. <p class="card-text"><strong>Keywords:</strong> <a href="https://publications.waset.org/abstracts/search?q=lactation%20curve" title="lactation curve">lactation curve</a>, <a href="https://publications.waset.org/abstracts/search?q=Holstein" title=" Holstein"> Holstein</a>, <a href="https://publications.waset.org/abstracts/search?q=milk%20production" title=" milk production"> milk production</a>, <a href="https://publications.waset.org/abstracts/search?q=influencing%20factors" title=" influencing factors"> influencing factors</a> </p> <a href="https://publications.waset.org/abstracts/183985/lactation-curve-at-holstein-cows-in-romania-and-influencing-factors" class="btn btn-primary btn-sm">Procedia</a> <a href="https://publications.waset.org/abstracts/183985.pdf" target="_blank" class="btn btn-primary btn-sm">PDF</a> <span class="bg-info text-light px-1 py-1 float-right rounded"> Downloads <span class="badge badge-light">62</span> </span> </div> </div> <div class="card paper-listing mb-3 mt-3"> <h5 class="card-header" style="font-size:.9rem"><span class="badge badge-info">7373</span> Capital Accumulation, Technology Diffusion and Economic Growth: An Empirical Application to Tunisian Case</h5> <div class="card-body"> <p class="card-text"><strong>Authors:</strong> <a href="https://publications.waset.org/abstracts/search?q=Ahmed%20Bellakhdhar">Ahmed Bellakhdhar</a> </p> <p class="card-text"><strong>Abstract:</strong></p> This paper aims to test the impact of various variables-namely, investment in physical capital, investment in human capital, openness to trade and foreign direct investments, and distance from the technology frontier-on economic growth in the Tunisian context during the period 1976-2010. Empirical results identify that the impact of human capital is significantly positive. This finding confirms the hypothesis that human capital is a main driver of economic performance through its role of improving the internal productive capacity and the absorption of foreign technology especially via foreign direct investments. The effect of FDI is significantly positive in all alternative regressions and the coefficient associated to physical capital variable is positive, but not significant overall. Concerning the import of technologically advanced equipments, our estimates show the absence of a significant direct impact on economic growth in Tunisia. Our empirical results also support the assumption of a non linear relationship between tax and growth and demonstrate the existence of an inverted-U curve between the two variables, in the spirit of the “Laffer curve”. <p class="card-text"><strong>Keywords:</strong> <a href="https://publications.waset.org/abstracts/search?q=Endogenous%20growth" title="Endogenous growth">Endogenous growth</a>, <a href="https://publications.waset.org/abstracts/search?q=Human%20capital" title=" Human capital"> Human capital</a>, <a href="https://publications.waset.org/abstracts/search?q=Technology%20transfer" title=" Technology transfer"> Technology transfer</a>, <a href="https://publications.waset.org/abstracts/search?q=Absorptive%20capacity" title=" Absorptive capacity"> Absorptive capacity</a> </p> <a href="https://publications.waset.org/abstracts/121905/capital-accumulation-technology-diffusion-and-economic-growth-an-empirical-application-to-tunisian-case" class="btn btn-primary btn-sm">Procedia</a> <a href="https://publications.waset.org/abstracts/121905.pdf" target="_blank" class="btn btn-primary btn-sm">PDF</a> <span class="bg-info text-light px-1 py-1 float-right rounded"> Downloads <span class="badge badge-light">133</span> </span> </div> </div> <div class="card paper-listing mb-3 mt-3"> <h5 class="card-header" style="font-size:.9rem"><span class="badge badge-info">7372</span> Growth Curves Genetic Analysis of Native South Caspian Sea Poultry Using Bayesian Statistics</h5> <div class="card-body"> <p class="card-text"><strong>Authors:</strong> <a href="https://publications.waset.org/abstracts/search?q=Jamal%20Fayazi">Jamal Fayazi</a>, <a href="https://publications.waset.org/abstracts/search?q=Farhad%20Anoosheh"> Farhad Anoosheh</a>, <a href="https://publications.waset.org/abstracts/search?q=Mohammad%20R.%20Ghorbani"> Mohammad R. Ghorbani</a>, <a href="https://publications.waset.org/abstracts/search?q=Ali%20R.%20Paydar"> Ali R. Paydar</a> </p> <p class="card-text"><strong>Abstract:</strong></p> In this study, to determine the best non-linear regression model describing the growth curve of native poultry, 9657 chicks of generations 18, 19, and 20 raised in Mazandaran breeding center were used. Fowls and roosters of this center distributed in south of Caspian Sea region. To estimate the genetic variability of none linear regression parameter of growth traits, a Gibbs sampling of Bayesian analysis was used. The average body weight traits in the first day (BW1), eighth week (BW8) and twelfth week (BW12) were respectively estimated as 36.05, 763.03, and 1194.98 grams. Based on the coefficient of determination, mean squares of error and Akaike information criteria, Gompertz model was selected as the best growth descriptive function. In Gompertz model, the estimated values for the parameters of maturity weight (A), integration constant (B) and maturity rate (K) were estimated to be 1734.4, 3.986, and 0.282, respectively. The direct heritability of BW1, BW8 and BW12 were respectively reported to be as 0.378, 0.3709, 0.316, 0.389, 0.43, 0.09 and 0.07. With regard to estimated parameters, the results of this study indicated that there is a possibility to improve some property of growth curve using appropriate selection programs. <p class="card-text"><strong>Keywords:</strong> <a href="https://publications.waset.org/abstracts/search?q=direct%20heritability" title="direct heritability">direct heritability</a>, <a href="https://publications.waset.org/abstracts/search?q=Gompertz" title=" Gompertz"> Gompertz</a>, <a href="https://publications.waset.org/abstracts/search?q=growth%20traits" title=" growth traits"> growth traits</a>, <a href="https://publications.waset.org/abstracts/search?q=maturity%20weight" title=" maturity weight"> maturity weight</a>, <a href="https://publications.waset.org/abstracts/search?q=native%20poultry" title=" native poultry"> native poultry</a> </p> <a href="https://publications.waset.org/abstracts/91206/growth-curves-genetic-analysis-of-native-south-caspian-sea-poultry-using-bayesian-statistics" class="btn btn-primary btn-sm">Procedia</a> <a href="https://publications.waset.org/abstracts/91206.pdf" target="_blank" class="btn btn-primary btn-sm">PDF</a> <span class="bg-info text-light px-1 py-1 float-right rounded"> Downloads <span class="badge badge-light">265</span> </span> </div> </div> <div class="card paper-listing mb-3 mt-3"> <h5 class="card-header" style="font-size:.9rem"><span class="badge badge-info">7371</span> Working Memory Growth from Kindergarten to First Grade: Considering Impulsivity, Parental Discipline Methods and Socioeconomic Status</h5> <div class="card-body"> <p class="card-text"><strong>Authors:</strong> <a href="https://publications.waset.org/abstracts/search?q=Ayse%20Cobanoglu">Ayse Cobanoglu</a> </p> <p class="card-text"><strong>Abstract:</strong></p> Working memory can be defined as a workspace that holds and regulates active information in mind. This study investigates individual changes in children's working memory from kindergarten to first grade. The main purpose of the study is whether parental discipline methods and child impulsive/overactive behaviors affect children's working memory initial status and growth rate, controlling for gender, minority status, and socioeconomic status (SES). A linear growth curve model with the first four waves of the Early Childhood Longitudinal Study-Kindergarten Cohort of 2011 (ECLS-K:2011) is performed to analyze the individual growth of children's working memory longitudinally (N=3915). Results revealed that there is a significant variation among students' initial status in the kindergarten fall semester as well as the growth rate during the first two years of schooling. While minority status, SES, and children's overactive/impulsive behaviors influenced children's initial status, only SES and minority status were significantly associated with the growth rate of working memory. For parental discipline methods, such as giving a warning and ignoring the child's negative behavior, are also negatively associated with initial working memory scores. Following that, students' working memory growth rate is examined, and students with lower SES as well as minorities showed a faster growth pattern during the first two years of schooling. However, the findings of parental disciplinary methods on working memory growth rates were mixed. It can be concluded that schooling helps low-SES minority students to develop their working memory. <p class="card-text"><strong>Keywords:</strong> <a href="https://publications.waset.org/abstracts/search?q=growth%20curve%20modeling" title="growth curve modeling">growth curve modeling</a>, <a href="https://publications.waset.org/abstracts/search?q=impulsive%2Foveractive%20behaviors" title=" impulsive/overactive behaviors"> impulsive/overactive behaviors</a>, <a href="https://publications.waset.org/abstracts/search?q=parenting" title=" parenting"> parenting</a>, <a href="https://publications.waset.org/abstracts/search?q=working%20memory" title=" working memory"> working memory</a> </p> <a href="https://publications.waset.org/abstracts/114758/working-memory-growth-from-kindergarten-to-first-grade-considering-impulsivity-parental-discipline-methods-and-socioeconomic-status" class="btn btn-primary btn-sm">Procedia</a> <a href="https://publications.waset.org/abstracts/114758.pdf" target="_blank" class="btn btn-primary btn-sm">PDF</a> <span class="bg-info text-light px-1 py-1 float-right rounded"> Downloads <span class="badge badge-light">135</span> </span> </div> </div> <div class="card paper-listing mb-3 mt-3"> <h5 class="card-header" style="font-size:.9rem"><span class="badge badge-info">7370</span> Statistical Modeling of Mandarin Tone Sandhi: Neutralization of Underlying Pitch Targets</h5> <div class="card-body"> <p class="card-text"><strong>Authors:</strong> <a href="https://publications.waset.org/abstracts/search?q=Si%20Chen">Si Chen</a>, <a href="https://publications.waset.org/abstracts/search?q=Caroline%20Wiltshire"> Caroline Wiltshire</a>, <a href="https://publications.waset.org/abstracts/search?q=Bin%20Li"> Bin Li</a> </p> <p class="card-text"><strong>Abstract:</strong></p> This study statistically models the surface f0 contour and the underlying pitch target of a well-studied third sandhi tone of Mandarin Chinese. Although the growth curve analysis on the surface f0 contours indicates non-neutralization of this sandhi tone (T3) and the base T2, their underlying pitch targets do show neutralization. These results in Mandarin are also consistent with the perception of native speakers, where they cannot distinguish the third T3 from the base T2, compensating contextual variation. It is possible to use the proposed statistical procedure of testing underlying pitch targets to verify tone sandhi processes in other tonal languages. <p class="card-text"><strong>Keywords:</strong> <a href="https://publications.waset.org/abstracts/search?q=growth%20curve%20analysis" title="growth curve analysis">growth curve analysis</a>, <a href="https://publications.waset.org/abstracts/search?q=Mandarin%20Chinese" title=" Mandarin Chinese"> Mandarin Chinese</a>, <a href="https://publications.waset.org/abstracts/search?q=tone%20sandhi" title=" tone sandhi"> tone sandhi</a>, <a href="https://publications.waset.org/abstracts/search?q=underlying%20pitch%20target" title=" underlying pitch target"> underlying pitch target</a> </p> <a href="https://publications.waset.org/abstracts/55068/statistical-modeling-of-mandarin-tone-sandhi-neutralization-of-underlying-pitch-targets" class="btn btn-primary btn-sm">Procedia</a> <a href="https://publications.waset.org/abstracts/55068.pdf" target="_blank" class="btn btn-primary btn-sm">PDF</a> <span class="bg-info text-light px-1 py-1 float-right rounded"> Downloads <span class="badge badge-light">336</span> </span> </div> </div> <div class="card paper-listing mb-3 mt-3"> <h5 class="card-header" style="font-size:.9rem"><span class="badge badge-info">7369</span> Effects of Allium Sativum Essential Oil on MIC, MBC and Growth Curve of Vibrio Parahaemolyticus ATCC 43996 and Its Thermostable Direct Hemolysin Production</h5> <div class="card-body"> <p class="card-text"><strong>Authors:</strong> <a href="https://publications.waset.org/abstracts/search?q=Afshin%20Akhondzadeh%20Basti">Afshin Akhondzadeh Basti</a>, <a href="https://publications.waset.org/abstracts/search?q=Zohreh%20Mashak"> Zohreh Mashak</a>, <a href="https://publications.waset.org/abstracts/search?q=Ali%20Khanjari"> Ali Khanjari</a>, <a href="https://publications.waset.org/abstracts/search?q=Mohammad%20Adel%20Rezaei"> Mohammad Adel Rezaei</a>, <a href="https://publications.waset.org/abstracts/search?q=Fatemeh%20Mohammadkhan"> Fatemeh Mohammadkhan</a> </p> <p class="card-text"><strong>Abstract:</strong></p> Vibrio parahaemolyticus is a halophilic bacterium and often causes gastroenteritis because of consumption of raw or inadequately cooked seafood. Studies showed a strong association of thermostable direct hemolysin (TDH) produced by members of this species with its pathogenicity. The effects of garlic (Allium sativum) essential oil at concentrations of 0, 0.005, 0.015, 0.03 and 0.045% on the minimum inhibitiotory concentration (MIC), minimum bactericidal concentration (MBC), growth curve and production of TDH toxin of vibrio parahaemolyticus were studied in BHI model. MIC and MBC of Allium sativum essential oil was estimated 0.03%. The results of this study revealed that the TDH production was significantly affected by Allium sativum EO and titers of TDH production in 0 and 0.005 % were 1/256 whereas this titer in 0.015 % concentration of EO. Concentrations of 0.005 and 0/015 % of garlic essential oil reduced the bacterial growth rate significantly (P < 0.05) compared to the control group. According to the results Allium sativum essential oil showed to be effective against bacterial growth and production of TDH toxin. Its potential application in food systems may be suggested. <p class="card-text"><strong>Keywords:</strong> <a href="https://publications.waset.org/abstracts/search?q=allium%20sativum%20essential%20oil" title="allium sativum essential oil">allium sativum essential oil</a>, <a href="https://publications.waset.org/abstracts/search?q=vibrio%20parahaemolyticus" title=" vibrio parahaemolyticus"> vibrio parahaemolyticus</a>, <a href="https://publications.waset.org/abstracts/search?q=TDH" title=" TDH"> TDH</a>, <a href="https://publications.waset.org/abstracts/search?q=consumption" title=" consumption"> consumption</a> </p> <a href="https://publications.waset.org/abstracts/22990/effects-of-allium-sativum-essential-oil-on-mic-mbc-and-growth-curve-of-vibrio-parahaemolyticus-atcc-43996-and-its-thermostable-direct-hemolysin-production" class="btn btn-primary btn-sm">Procedia</a> <a href="https://publications.waset.org/abstracts/22990.pdf" target="_blank" class="btn btn-primary btn-sm">PDF</a> <span class="bg-info text-light px-1 py-1 float-right rounded"> Downloads <span class="badge badge-light">428</span> </span> </div> </div> <div class="card paper-listing mb-3 mt-3"> <h5 class="card-header" style="font-size:.9rem"><span class="badge badge-info">7368</span> Bifurcation Curve for Semipositone Problem with Minkowski-Curvature Operator</h5> <div class="card-body"> <p class="card-text"><strong>Authors:</strong> <a href="https://publications.waset.org/abstracts/search?q=Shao-Yuan%20Huang">Shao-Yuan Huang</a> </p> <p class="card-text"><strong>Abstract:</strong></p> We study the shape of the bifurcation curve of positive solutions for the semipositone problem with the Minkowski-curvature operator. The Minkowski-curvature problem plays an important role in certain fundamental issues in differential geometry and in the special theory of relativity. In addition, it is well known that studying the multiplicity of positive solutions is equivalent to studying the shape of the bifurcation curve. By the shape of the bifurcation curve, we can understand the change in the multiplicity of positive solutions with varying parameters. In this paper, our main technique is a time-map method used in Corsato's PhD Thesis. By this method, studying the shape of the bifurcation curve is equivalent to studying the shape of a certain function T with improper integral. Generally speaking, it is difficult to study the shape of T. So, in this paper, we consider two cases that the nonlinearity is convex or concave. Thus we obtain the following results: (i) If f''(u) < 0 for u > 0, then the bifurcation curve is C-shaped. (ii) If f''(u) > 0 for u > 0, then there exists η>β such that the bifurcation curve does not exist for 0 <L≤ η and is C- like shaped for L>η. Furthermore, we prove that the bifurcation is C-shaped for L > η under a certain condition. <p class="card-text"><strong>Keywords:</strong> <a href="https://publications.waset.org/abstracts/search?q=bifurcation%20curve" title="bifurcation curve">bifurcation curve</a>, <a href="https://publications.waset.org/abstracts/search?q=Minkowski-curvature%20problem" title=" Minkowski-curvature problem"> Minkowski-curvature problem</a>, <a href="https://publications.waset.org/abstracts/search?q=positive%20solution" title=" positive solution"> positive solution</a>, <a href="https://publications.waset.org/abstracts/search?q=time-map%20method" title=" time-map method"> time-map method</a> </p> <a href="https://publications.waset.org/abstracts/159183/bifurcation-curve-for-semipositone-problem-with-minkowski-curvature-operator" class="btn btn-primary btn-sm">Procedia</a> <a href="https://publications.waset.org/abstracts/159183.pdf" target="_blank" class="btn btn-primary btn-sm">PDF</a> <span class="bg-info text-light px-1 py-1 float-right rounded"> Downloads <span class="badge badge-light">103</span> </span> </div> </div> <div class="card paper-listing mb-3 mt-3"> <h5 class="card-header" style="font-size:.9rem"><span class="badge badge-info">7367</span> Democracy as a Curve: A Study on How Democratization Impacts Economic Growth</h5> <div class="card-body"> <p class="card-text"><strong>Authors:</strong> <a href="https://publications.waset.org/abstracts/search?q=Henrique%20Alpalh%C3%A3o">Henrique Alpalhão</a> </p> <p class="card-text"><strong>Abstract:</strong></p> This paper attempts to model the widely studied relationship between a country's economic growth and its level of democracy, with an emphasis on possible non-linearities. We adopt the concept of 'political capital' as a measure of democracy, which is extremely uncommon in the literature and brings considerable advantages both in terms of dynamic considerations and plausibility. While the literature is not consensual on this matter, we obtain, via panel Arellano-Bond regression analysis on a database of more than 60 countries over 50 years, significant and robust results that indicate that the impact of democratization on economic growth varies according to the stage of democratic development each country is in. <p class="card-text"><strong>Keywords:</strong> <a href="https://publications.waset.org/abstracts/search?q=democracy" title="democracy">democracy</a>, <a href="https://publications.waset.org/abstracts/search?q=economic%20growth" title=" economic growth"> economic growth</a>, <a href="https://publications.waset.org/abstracts/search?q=political%20capital" title=" political capital"> political capital</a>, <a href="https://publications.waset.org/abstracts/search?q=political%20economy" title=" political economy"> political economy</a> </p> <a href="https://publications.waset.org/abstracts/81495/democracy-as-a-curve-a-study-on-how-democratization-impacts-economic-growth" class="btn btn-primary btn-sm">Procedia</a> <a href="https://publications.waset.org/abstracts/81495.pdf" target="_blank" class="btn btn-primary btn-sm">PDF</a> <span class="bg-info text-light px-1 py-1 float-right rounded"> Downloads <span class="badge badge-light">321</span> </span> </div> </div> <div class="card paper-listing mb-3 mt-3"> <h5 class="card-header" style="font-size:.9rem"><span class="badge badge-info">7366</span> Nexus between Energy, Environment and Economic Growth: Sectoral Analysis from Pakistan</h5> <div class="card-body"> <p class="card-text"><strong>Authors:</strong> <a href="https://publications.waset.org/abstracts/search?q=Muhammad%20Afzal">Muhammad Afzal</a>, <a href="https://publications.waset.org/abstracts/search?q=Muhammad%20Sajjad"> Muhammad Sajjad</a> </p> <p class="card-text"><strong>Abstract:</strong></p> Climate change has become a global environmental challenge and it has affected the world’s economy. Its impact is widespread across all major sectors of the economy i.e. agriculture, industry, and services sectors. This study attempts to measure the long run as well as the short-run dynamic between energy; environment and economic growth by using Autoregressive Distributed Lag (ARDL) bound testing approach at aggregate as well as sectoral level. We measured the causal relationship between electricity consumption, fuel consumption, CO₂ emission, and real Gross Domestic Product (GDP) for the period of 1980 to 2016 for Pakistan. Our co-integration results reveal that all the variables are co-integrated at aggregate as well as at sectoral level. Electricity consumption shows two-way casual relation at for industry, services and aggregate level. The inverted U-Curve hypothesis tested the relationship between greenhouse gas emissions and per capita GDP and results supported the Environment Kuznet Curve (EKC) hypothesis. This study cannot ignore the importance of energy for economic growth but prefers to focus on renewable and green energy to pave on the trajectory of development. <p class="card-text"><strong>Keywords:</strong> <a href="https://publications.waset.org/abstracts/search?q=climate%20change" title="climate change">climate change</a>, <a href="https://publications.waset.org/abstracts/search?q=economic%20growth" title=" economic growth"> economic growth</a>, <a href="https://publications.waset.org/abstracts/search?q=energy" title=" energy"> energy</a>, <a href="https://publications.waset.org/abstracts/search?q=environment" title=" environment"> environment</a> </p> <a href="https://publications.waset.org/abstracts/90349/nexus-between-energy-environment-and-economic-growth-sectoral-analysis-from-pakistan" class="btn btn-primary btn-sm">Procedia</a> <a href="https://publications.waset.org/abstracts/90349.pdf" target="_blank" class="btn btn-primary btn-sm">PDF</a> <span class="bg-info text-light px-1 py-1 float-right rounded"> Downloads <span class="badge badge-light">164</span> </span> </div> </div> <div class="card paper-listing mb-3 mt-3"> <h5 class="card-header" style="font-size:.9rem"><span class="badge badge-info">7365</span> Debt Relief for Emerging Economies: An Empirical Investigation</h5> <div class="card-body"> <p class="card-text"><strong>Authors:</strong> <a href="https://publications.waset.org/abstracts/search?q=Hummad%20Ch.%20Umar">Hummad Ch. Umar </a> </p> <p class="card-text"><strong>Abstract:</strong></p> Most of the developing economies, including Pakistan, are confronted with high level of external debt which is adversely affecting their economic performance. The hypothesis of debt overhang is often used to assess the negative relationship between foreign debt and the economic growth of the indebted country. As first objective of the present study, this hypothesis is tested by using Pooled OLS (POLS), Generalized Method of Moment (GMM), Random Effect (RE), and Fixed effect (FE) techniques. As second objective, the study uses the concept of debt Laffer Curve to determine the eligibility condition of the indebted countries for the relief programs. According to this approach, countries lying on the right side of the Laffer Curve are stated to be trapped in the strong debt overhang making them unable to come out of the vicious circle of low growth and high foreign debt. The empirical analysis confirms that only two countries out of twenty two completely fulfill the conditions of being eligible for the debt relief. All other countries continue to face debt burden of different magnitudes. The study further confirms that the debt relief alone is not sufficient for overcoming the debt problem. Instead, sound economic policies and conducive investment decisions are required to lay the foundations of long-term growth and development. Debt relief should be the option for only those countries that meet a minimum measurable criterion of good governance, economic freedom, and consistency of policies. <p class="card-text"><strong>Keywords:</strong> <a href="https://publications.waset.org/abstracts/search?q=external%20debt" title="external debt">external debt</a>, <a href="https://publications.waset.org/abstracts/search?q=debt%20burden" title=" debt burden"> debt burden</a>, <a href="https://publications.waset.org/abstracts/search?q=debt%20overhang" title=" debt overhang"> debt overhang</a>, <a href="https://publications.waset.org/abstracts/search?q=debt%20laffer%20curve" title=" debt laffer curve"> debt laffer curve</a>, <a href="https://publications.waset.org/abstracts/search?q=debt%20relief" title=" debt relief"> debt relief</a>, <a href="https://publications.waset.org/abstracts/search?q=investment%20decisions" title=" investment decisions"> investment decisions</a> </p> <a href="https://publications.waset.org/abstracts/38102/debt-relief-for-emerging-economies-an-empirical-investigation" class="btn btn-primary btn-sm">Procedia</a> <a href="https://publications.waset.org/abstracts/38102.pdf" target="_blank" class="btn btn-primary btn-sm">PDF</a> <span class="bg-info text-light px-1 py-1 float-right rounded"> Downloads <span class="badge badge-light">326</span> </span> </div> </div> <div class="card paper-listing mb-3 mt-3"> <h5 class="card-header" style="font-size:.9rem"><span class="badge badge-info">7364</span> Solving 94-Bit ECDLP with 70 Computers in Parallel</h5> <div class="card-body"> <p class="card-text"><strong>Authors:</strong> <a href="https://publications.waset.org/abstracts/search?q=Shunsuke%20Miyoshi">Shunsuke Miyoshi</a>, <a href="https://publications.waset.org/abstracts/search?q=Yasuyuki%20Nogami"> Yasuyuki Nogami</a>, <a href="https://publications.waset.org/abstracts/search?q=Takuya%20Kusaka"> Takuya Kusaka</a>, <a href="https://publications.waset.org/abstracts/search?q=Nariyoshi%20Yamai"> Nariyoshi Yamai</a> </p> <p class="card-text"><strong>Abstract:</strong></p> Elliptic curve discrete logarithm problem (ECDLP) is one of problems on which the security of pairing-based cryptography is based. This paper considers Pollard's rho method to evaluate the security of ECDLP on Barreto-Naehrig (BN) curve that is an efficient pairing-friendly curve. Some techniques are proposed to make the rho method efficient. Especially, the group structure on BN curve, distinguished point method, and Montgomery trick are well-known techniques. This paper applies these techniques and shows its optimization. According to the experimental results for which a large-scale parallel system with MySQL is applied, 94-bit ECDLP was solved about 28 hours by parallelizing 71 computers. <p class="card-text"><strong>Keywords:</strong> <a href="https://publications.waset.org/abstracts/search?q=Pollard%27s%20rho%20method" title="Pollard's rho method">Pollard's rho method</a>, <a href="https://publications.waset.org/abstracts/search?q=BN%20curve" title=" BN curve"> BN curve</a>, <a href="https://publications.waset.org/abstracts/search?q=Montgomery%20multiplication" title=" Montgomery multiplication"> Montgomery multiplication</a> </p> <a href="https://publications.waset.org/abstracts/28038/solving-94-bit-ecdlp-with-70-computers-in-parallel" class="btn btn-primary btn-sm">Procedia</a> <a href="https://publications.waset.org/abstracts/28038.pdf" target="_blank" class="btn btn-primary btn-sm">PDF</a> <span class="bg-info text-light px-1 py-1 float-right rounded"> Downloads <span class="badge badge-light">272</span> </span> </div> </div> <div class="card paper-listing mb-3 mt-3"> <h5 class="card-header" style="font-size:.9rem"><span class="badge badge-info">7363</span> Generating Arabic Fonts Using Rational Cubic Ball Functions</h5> <div class="card-body"> <p class="card-text"><strong>Authors:</strong> <a href="https://publications.waset.org/abstracts/search?q=Fakharuddin%20Ibrahim">Fakharuddin Ibrahim</a>, <a href="https://publications.waset.org/abstracts/search?q=Jamaludin%20Md.%20Ali"> Jamaludin Md. Ali</a>, <a href="https://publications.waset.org/abstracts/search?q=Ahmad%20Ramli"> Ahmad Ramli </a> </p> <p class="card-text"><strong>Abstract:</strong></p> In this paper, we will discuss about the data interpolation by using the rational cubic Ball curve. To generate a curve with a better and satisfactory smoothness, the curve segments must be connected with a certain amount of continuity. The continuity that we will consider is of type G<sup>1</sup> continuity. The conditions considered are known as the G<sup>1</sup> Hermite condition. A simple application of the proposed method is to generate an Arabic font satisfying the required continuity. <p class="card-text"><strong>Keywords:</strong> <a href="https://publications.waset.org/abstracts/search?q=data%20interpolation" title="data interpolation">data interpolation</a>, <a href="https://publications.waset.org/abstracts/search?q=rational%20ball%20curve" title=" rational ball curve"> rational ball curve</a>, <a href="https://publications.waset.org/abstracts/search?q=hermite%20condition" title=" hermite condition"> hermite condition</a>, <a href="https://publications.waset.org/abstracts/search?q=continuity" title=" continuity"> continuity</a> </p> <a href="https://publications.waset.org/abstracts/44202/generating-arabic-fonts-using-rational-cubic-ball-functions" class="btn btn-primary btn-sm">Procedia</a> <a href="https://publications.waset.org/abstracts/44202.pdf" target="_blank" class="btn btn-primary btn-sm">PDF</a> <span class="bg-info text-light px-1 py-1 float-right rounded"> Downloads <span class="badge badge-light">429</span> </span> </div> </div> <div class="card paper-listing mb-3 mt-3"> <h5 class="card-header" style="font-size:.9rem"><span class="badge badge-info">7362</span> Examining the Missing Feedback Link in Environmental Kuznets Curve Hypothesis</h5> <div class="card-body"> <p class="card-text"><strong>Authors:</strong> <a href="https://publications.waset.org/abstracts/search?q=Apra%20Sinha">Apra Sinha</a> </p> <p class="card-text"><strong>Abstract:</strong></p> The inverted U-shaped Environmental Kuznets curve (EKC) demonstrates(pollution-income relationship)that initially the pollution and environmental degradation surpass the level of income per capita; however this trend reverses since at the higher income levels, economic growth initiates environmental upgrading. However, what effect does increased environmental degradation has on growth is the missing feedback link which has not been addressed in the EKC hypothesis. This paper examines the missing feedback link in EKC hypothesis in Indian context by examining the casual association between fossil fuel consumption, carbon dioxide emissions and economic growth for India. Fossil fuel consumption here has been taken as a proxy of driver of economic growth. The casual association between the aforementioned variables has been analyzed using five interventions namely 1) urban development for which urbanization has been taken proxy 2) industrial development for which industrial value added has been taken proxy 3) trade liberalization for which sum of exports and imports as a share of GDP has been taken as proxy 4)financial development for which a)domestic credit to private sector and b)net foreign assets has been taken as proxies. The choice of interventions for this study has been done keeping in view the economic liberalization perspective of India. The main aim of the paper is to investigate the missing feedback link for Environmental Kuznets Curve Hypothesis before and after incorporating the intervening variables. The period of study is from 1971 to 2011 as it covers pre and post liberalization era in India. All the data has been taken from World Bank country level indicators. The Johansen and Juselius cointegration testing methodology and Error Correction based Granger causality have been applied on all the variables. The results clearly show that out of five interventions, only in two interventions the missing feedback link is being addressed. This paper can put forward significant policy implications for environment protection and sustainable development. <p class="card-text"><strong>Keywords:</strong> <a href="https://publications.waset.org/abstracts/search?q=environmental%20Kuznets%20curve%20hypothesis" title="environmental Kuznets curve hypothesis">environmental Kuznets curve hypothesis</a>, <a href="https://publications.waset.org/abstracts/search?q=fossil%20fuel%20consumption" title=" fossil fuel consumption"> fossil fuel consumption</a>, <a href="https://publications.waset.org/abstracts/search?q=industrialization" title=" industrialization"> industrialization</a>, <a href="https://publications.waset.org/abstracts/search?q=trade%20liberalization" title=" trade liberalization"> trade liberalization</a>, <a href="https://publications.waset.org/abstracts/search?q=urbanization" title=" urbanization"> urbanization</a> </p> <a href="https://publications.waset.org/abstracts/73656/examining-the-missing-feedback-link-in-environmental-kuznets-curve-hypothesis" class="btn btn-primary btn-sm">Procedia</a> <a href="https://publications.waset.org/abstracts/73656.pdf" target="_blank" class="btn btn-primary btn-sm">PDF</a> <span class="bg-info text-light px-1 py-1 float-right rounded"> Downloads <span class="badge badge-light">252</span> </span> </div> </div> <div class="card paper-listing mb-3 mt-3"> <h5 class="card-header" style="font-size:.9rem"><span class="badge badge-info">7361</span> An Optimized RDP Algorithm for Curve Approximation</h5> <div class="card-body"> <p class="card-text"><strong>Authors:</strong> <a href="https://publications.waset.org/abstracts/search?q=Jean-Pierre%20Lomaliza">Jean-Pierre Lomaliza</a>, <a href="https://publications.waset.org/abstracts/search?q=Kwang-Seok%20Moon"> Kwang-Seok Moon</a>, <a href="https://publications.waset.org/abstracts/search?q=Hanhoon%20Park"> Hanhoon Park</a> </p> <p class="card-text"><strong>Abstract:</strong></p> It is well-known that Ramer Douglas Peucker (RDP) algorithm greatly depends on the method of choosing starting points. Therefore, this paper focuses on finding such starting points that will optimize the results of RDP algorithm. Specifically, this paper proposes a curve approximation algorithm that finds flat points, called essential points, of an input curve, divides the curve into corner-like sub-curves using the essential points, and applies the RDP algorithm to the sub-curves. The number of essential points play a role on optimizing the approximation results by balancing the degree of shape information loss and the amount of data reduction. Through experiments with curves of various types and complexities of shape, we compared the performance of the proposed algorithm with three other methods, i.e., the RDP algorithm itself and its variants. As a result, the proposed algorithm outperformed the others in term of maintaining the original shapes of the input curve, which is important in various applications like pattern recognition. <p class="card-text"><strong>Keywords:</strong> <a href="https://publications.waset.org/abstracts/search?q=curve%20approximation" title="curve approximation">curve approximation</a>, <a href="https://publications.waset.org/abstracts/search?q=essential%20point" title=" essential point"> essential point</a>, <a href="https://publications.waset.org/abstracts/search?q=RDP%20algorithm" title=" RDP algorithm"> RDP algorithm</a> </p> <a href="https://publications.waset.org/abstracts/29359/an-optimized-rdp-algorithm-for-curve-approximation" class="btn btn-primary btn-sm">Procedia</a> <a href="https://publications.waset.org/abstracts/29359.pdf" target="_blank" class="btn btn-primary btn-sm">PDF</a> <span class="bg-info text-light px-1 py-1 float-right rounded"> Downloads <span class="badge badge-light">535</span> </span> </div> </div> <div class="card paper-listing mb-3 mt-3"> <h5 class="card-header" style="font-size:.9rem"><span class="badge badge-info">7360</span> A Cohesive Zone Model with Parameters Determined by Uniaxial Stress-Strain Curve</h5> <div class="card-body"> <p class="card-text"><strong>Authors:</strong> <a href="https://publications.waset.org/abstracts/search?q=Y.J.%20Wang">Y.J. Wang</a>, <a href="https://publications.waset.org/abstracts/search?q=C.%20Q.%20Ru"> C. Q. Ru</a> </p> <p class="card-text"><strong>Abstract:</strong></p> A key issue of cohesive zone models is how to determine the cohesive zone model parameters based on real material test data. In this paper, uniaxial nominal stress-strain curve (SS curve) is used to determine two key parameters of a cohesive zone model (CZM): The maximum traction and the area under the curve of traction-separation law (TSL). To this end, the true SS curve is obtained based on the nominal SS curve, and the relationship between the nominal SS curve and TSL is derived based on an assumption that the stress for cracking should be the same in both CZM and the real material. In particular, the true SS curve after necking is derived from the nominal SS curve by taking the average of the power law extrapolation and the linear extrapolation, and a damage factor is introduced to offset the true stress reduction caused by the voids generated at the necking zone. The maximum traction of the TSL is equal to the maximum true stress calculated based on the damage factor at the end of hardening. In addition, a simple specimen is modeled by Abaqus/Standard to calculate the critical J-integral, and the fracture energy calculated by the critical J-integral represents the stored strain energy in the necking zone calculated by the true SS curve. Finally, the CZM parameters obtained by the present method are compared to those used in a previous related work for a simulation of the drop-weight tear test. <p class="card-text"><strong>Keywords:</strong> <a href="https://publications.waset.org/abstracts/search?q=dynamic%20fracture" title="dynamic fracture">dynamic fracture</a>, <a href="https://publications.waset.org/abstracts/search?q=cohesive%20zone%20model" title=" cohesive zone model"> cohesive zone model</a>, <a href="https://publications.waset.org/abstracts/search?q=traction-separation%20law" title=" traction-separation law"> traction-separation law</a>, <a href="https://publications.waset.org/abstracts/search?q=stress-strain%20curve" title=" stress-strain curve"> stress-strain curve</a>, <a href="https://publications.waset.org/abstracts/search?q=J-integral" title=" J-integral"> J-integral</a> </p> <a href="https://publications.waset.org/abstracts/21419/a-cohesive-zone-model-with-parameters-determined-by-uniaxial-stress-strain-curve" class="btn btn-primary btn-sm">Procedia</a> <a href="https://publications.waset.org/abstracts/21419.pdf" target="_blank" class="btn btn-primary btn-sm">PDF</a> <span class="bg-info text-light px-1 py-1 float-right rounded"> Downloads <span class="badge badge-light">474</span> </span> </div> </div> <div class="card paper-listing mb-3 mt-3"> <h5 class="card-header" style="font-size:.9rem"><span class="badge badge-info">7359</span> Determination of Cohesive Zone Model’s Parameters Based On the Uniaxial Stress-Strain Curve</h5> <div class="card-body"> <p class="card-text"><strong>Authors:</strong> <a href="https://publications.waset.org/abstracts/search?q=Y.%20J.%20Wang">Y. J. Wang</a>, <a href="https://publications.waset.org/abstracts/search?q=C.%20Q.%20Ru"> C. Q. Ru</a> </p> <p class="card-text"><strong>Abstract:</strong></p> A key issue of cohesive zone models is how to determine the cohesive zone model (CZM) parameters based on real material test data. In this paper, uniaxial nominal stress-strain curve (SS curve) is used to determine two key parameters of a cohesive zone model: the maximum traction and the area under the curve of traction-separation law (TSL). To this end, the true SS curve is obtained based on the nominal SS curve, and the relationship between the nominal SS curve and TSL is derived based on an assumption that the stress for cracking should be the same in both CZM and the real material. In particular, the true SS curve after necking is derived from the nominal SS curve by taking the average of the power law extrapolation and the linear extrapolation, and a damage factor is introduced to offset the true stress reduction caused by the voids generated at the necking zone. The maximum traction of the TSL is equal to the maximum true stress calculated based on the damage factor at the end of hardening. In addition, a simple specimen is simulated by Abaqus/Standard to calculate the critical J-integral, and the fracture energy calculated by the critical J-integral represents the stored strain energy in the necking zone calculated by the true SS curve. Finally, the CZM parameters obtained by the present method are compared to those used in a previous related work for a simulation of the drop-weight tear test. <p class="card-text"><strong>Keywords:</strong> <a href="https://publications.waset.org/abstracts/search?q=dynamic%20fracture" title="dynamic fracture">dynamic fracture</a>, <a href="https://publications.waset.org/abstracts/search?q=cohesive%20zone%20model" title=" cohesive zone model"> cohesive zone model</a>, <a href="https://publications.waset.org/abstracts/search?q=traction-separation%20law" title=" traction-separation law"> traction-separation law</a>, <a href="https://publications.waset.org/abstracts/search?q=stress-strain%20curve" title=" stress-strain curve"> stress-strain curve</a>, <a href="https://publications.waset.org/abstracts/search?q=J-integral" title=" J-integral"> J-integral</a> </p> <a href="https://publications.waset.org/abstracts/23486/determination-of-cohesive-zone-models-parameters-based-on-the-uniaxial-stress-strain-curve" class="btn btn-primary btn-sm">Procedia</a> <a href="https://publications.waset.org/abstracts/23486.pdf" target="_blank" class="btn btn-primary btn-sm">PDF</a> <span class="bg-info text-light px-1 py-1 float-right rounded"> Downloads <span class="badge badge-light">513</span> </span> </div> </div> <div class="card paper-listing mb-3 mt-3"> <h5 class="card-header" style="font-size:.9rem"><span class="badge badge-info">7358</span> Critical Study on the Sensitivity of Corrosion Fatigue Crack Growth Rate to Cyclic Waveform and Microstructure in Marine Steel</h5> <div class="card-body"> <p class="card-text"><strong>Authors:</strong> <a href="https://publications.waset.org/abstracts/search?q=V.%20C.%20Igwemezie">V. C. Igwemezie</a>, <a href="https://publications.waset.org/abstracts/search?q=A.%20N.%20Mehmanparast"> A. N. Mehmanparast</a> </p> <p class="card-text"><strong>Abstract:</strong></p> The primary focus of this work is to understand how variations in the microstructure and cyclic waveform affect the corrosion fatigue crack growth (CFCG) in steel, especially in the Paris region of the da/dN vs. ΔK curve. This work is important because it provides fundamental information on the modelling, design, selection, and use of steels for various engineering applications in the marine environment. The corrosion fatigue tests data on normalized and thermomechanical control process (TMCP) ferritic-pearlitic steels by the authors were compared with several studies on different microstructures in the literature. The microstructures of these steels are radically different and general comparative fatigue crack growth resistance performance study on the effect of microstructure in these materials are very scarce and where available are limited to few studies. The results, for purposes of engineering application, in this study show less dependency of fatigue crack growth rate (FCGR) on yield strength, tensile strength, ductility, frequency and stress ratio in the range 0.1 – 0.7. The nature of the steel microstructure appears to be a major factor in determining the rate at which fatigue cracks propagate in the entire da/dN vs. ΔK sigmoidal curve. The study also shows that the sine wave shape is the most damaging fatigue waveform for ferritic-pearlitic steels. This tends to suggest that the test under sine waveform would be a conservative approach, regardless of the waveform for design of engineering structures. <p class="card-text"><strong>Keywords:</strong> <a href="https://publications.waset.org/abstracts/search?q=BS7910" title="BS7910">BS7910</a>, <a href="https://publications.waset.org/abstracts/search?q=corrosion-fatigue%20crack%20growth%20rate" title=" corrosion-fatigue crack growth rate"> corrosion-fatigue crack growth rate</a>, <a href="https://publications.waset.org/abstracts/search?q=cyclic%20waveform" title=" cyclic waveform"> cyclic waveform</a>, <a href="https://publications.waset.org/abstracts/search?q=microstructure" title=" microstructure"> microstructure</a>, <a href="https://publications.waset.org/abstracts/search?q=steel" title=" steel"> steel</a> </p> <a href="https://publications.waset.org/abstracts/102147/critical-study-on-the-sensitivity-of-corrosion-fatigue-crack-growth-rate-to-cyclic-waveform-and-microstructure-in-marine-steel" class="btn btn-primary btn-sm">Procedia</a> <a href="https://publications.waset.org/abstracts/102147.pdf" target="_blank" class="btn btn-primary btn-sm">PDF</a> <span class="bg-info text-light px-1 py-1 float-right rounded"> Downloads <span class="badge badge-light">155</span> </span> </div> </div> <div class="card paper-listing mb-3 mt-3"> <h5 class="card-header" style="font-size:.9rem"><span class="badge badge-info">7357</span> Cotton Transplantation as a Practice to Escape Infection with Some Soil-Borne Pathogens</h5> <div class="card-body"> <p class="card-text"><strong>Authors:</strong> <a href="https://publications.waset.org/abstracts/search?q=E.%20M.%20H.%20Maggie">E. M. H. Maggie</a>, <a href="https://publications.waset.org/abstracts/search?q=M.%20N.%20A.%20Nazmey"> M. N. A. Nazmey</a>, <a href="https://publications.waset.org/abstracts/search?q=M.%20A.%20Abdel-Sattar"> M. A. Abdel-Sattar</a>, <a href="https://publications.waset.org/abstracts/search?q=S.%20A.%20Saied"> S. A. Saied</a> </p> <p class="card-text"><strong>Abstract:</strong></p> A successful trial of transplanting cotton is reported. Seeds grown in trays for 4-5 weeks in an easily prepared supporting medium such as peat moss or similar plant waste are tried. Careful transplanting of seedlings, with root system as intact as possible, is being made in the permanent field. The practice reduced damping-off incidence rate and allowed full winter crop revenues. Further work is needed to evaluate certain parameters such as growth curve, flowering curve, and yield at economic bases. <p class="card-text"><strong>Keywords:</strong> <a href="https://publications.waset.org/abstracts/search?q=cotton" title="cotton">cotton</a>, <a href="https://publications.waset.org/abstracts/search?q=transplanting%20cotton" title=" transplanting cotton"> transplanting cotton</a>, <a href="https://publications.waset.org/abstracts/search?q=damping-off%20diseases" title=" damping-off diseases"> damping-off diseases</a>, <a href="https://publications.waset.org/abstracts/search?q=environment%20sciences" title=" environment sciences"> environment sciences</a> </p> <a href="https://publications.waset.org/abstracts/3698/cotton-transplantation-as-a-practice-to-escape-infection-with-some-soil-borne-pathogens" class="btn btn-primary btn-sm">Procedia</a> <a href="https://publications.waset.org/abstracts/3698.pdf" target="_blank" class="btn btn-primary btn-sm">PDF</a> <span class="bg-info text-light px-1 py-1 float-right rounded"> Downloads <span class="badge badge-light">367</span> </span> </div> </div> <div class="card paper-listing mb-3 mt-3"> <h5 class="card-header" style="font-size:.9rem"><span class="badge badge-info">7356</span> Detection of Keypoint in Press-Fit Curve Based on Convolutional Neural Network</h5> <div class="card-body"> <p class="card-text"><strong>Authors:</strong> <a href="https://publications.waset.org/abstracts/search?q=Shoujia%20Fang">Shoujia Fang</a>, <a href="https://publications.waset.org/abstracts/search?q=Guoqing%20Ding"> Guoqing Ding</a>, <a href="https://publications.waset.org/abstracts/search?q=Xin%20Chen"> Xin Chen</a> </p> <p class="card-text"><strong>Abstract:</strong></p> The quality of press-fit assembly is closely related to reliability and safety of product. The paper proposed a keypoint detection method based on convolutional neural network to improve the accuracy of keypoint detection in press-fit curve. It would provide an auxiliary basis for judging quality of press-fit assembly. The press-fit curve is a curve of press-fit force and displacement. Both force data and distance data are time-series data. Therefore, one-dimensional convolutional neural network is used to process the press-fit curve. After the obtained press-fit data is filtered, the multi-layer one-dimensional convolutional neural network is used to perform the automatic learning of press-fit curve features, and then sent to the multi-layer perceptron to finally output keypoint of the curve. We used the data of press-fit assembly equipment in the actual production process to train CNN model, and we used different data from the same equipment to evaluate the performance of detection. Compared with the existing research result, the performance of detection was significantly improved. This method can provide a reliable basis for the judgment of press-fit quality. <p class="card-text"><strong>Keywords:</strong> <a href="https://publications.waset.org/abstracts/search?q=keypoint%20detection" title="keypoint detection">keypoint detection</a>, <a href="https://publications.waset.org/abstracts/search?q=curve%20feature" title=" curve feature"> curve feature</a>, <a href="https://publications.waset.org/abstracts/search?q=convolutional%20neural%20network" title=" convolutional neural network"> convolutional neural network</a>, <a href="https://publications.waset.org/abstracts/search?q=press-fit%20assembly" title=" press-fit assembly"> press-fit assembly</a> </p> <a href="https://publications.waset.org/abstracts/98263/detection-of-keypoint-in-press-fit-curve-based-on-convolutional-neural-network" class="btn btn-primary btn-sm">Procedia</a> <a href="https://publications.waset.org/abstracts/98263.pdf" target="_blank" class="btn btn-primary btn-sm">PDF</a> <span class="bg-info text-light px-1 py-1 float-right rounded"> Downloads <span class="badge badge-light">230</span> </span> </div> </div> <div class="card paper-listing mb-3 mt-3"> <h5 class="card-header" style="font-size:.9rem"><span class="badge badge-info">7355</span> The Term Structure of Government Bond Yields in an Emerging Market: Empirical Evidence from Pakistan Bond Market</h5> <div class="card-body"> <p class="card-text"><strong>Authors:</strong> <a href="https://publications.waset.org/abstracts/search?q=Wali%20Ullah">Wali Ullah</a>, <a href="https://publications.waset.org/abstracts/search?q=Muhammad%20Nishat"> Muhammad Nishat</a> </p> <p class="card-text"><strong>Abstract:</strong></p> The study investigates the extent to which the so called Nelson-Siegel model (DNS) and its extended version that accounts for time varying volatility (DNS-EGARCH) can optimally fit the yield curve and predict its future path in the context of an emerging economy. For the in-sample fit, both models fit the curve remarkably well even in the emerging markets. However, the DNS-EGARCH model fits the curve slightly better than the DNS. Moreover, both specifications of yield curve that are based on the Nelson-Siegel functional form outperform the benchmark VAR forecasts at all forecast horizons. The DNS-EGARCH comes with more precise forecasts than the DNS for the 6- and 12-month ahead forecasts, while the two have almost similar performance in terms of RMSE for the very short forecast horizons. <p class="card-text"><strong>Keywords:</strong> <a href="https://publications.waset.org/abstracts/search?q=yield%20curve" title="yield curve">yield curve</a>, <a href="https://publications.waset.org/abstracts/search?q=forecasting" title=" forecasting"> forecasting</a>, <a href="https://publications.waset.org/abstracts/search?q=emerging%20markets" title=" emerging markets"> emerging markets</a>, <a href="https://publications.waset.org/abstracts/search?q=Kalman%20filter" title=" Kalman filter"> Kalman filter</a>, <a href="https://publications.waset.org/abstracts/search?q=EGARCH" title=" EGARCH"> EGARCH</a> </p> <a href="https://publications.waset.org/abstracts/17242/the-term-structure-of-government-bond-yields-in-an-emerging-market-empirical-evidence-from-pakistan-bond-market" class="btn btn-primary btn-sm">Procedia</a> <a href="https://publications.waset.org/abstracts/17242.pdf" target="_blank" class="btn btn-primary btn-sm">PDF</a> <span class="bg-info text-light px-1 py-1 float-right rounded"> Downloads <span class="badge badge-light">539</span> </span> </div> </div> <div class="card paper-listing mb-3 mt-3"> <h5 class="card-header" style="font-size:.9rem"><span class="badge badge-info">7354</span> Study of Bifurcation Curve with Aspect Ratio at Low Reynolds Number</h5> <div class="card-body"> <p class="card-text"><strong>Authors:</strong> <a href="https://publications.waset.org/abstracts/search?q=Amit%20K.%20Singh">Amit K. Singh</a>, <a href="https://publications.waset.org/abstracts/search?q=Subhankar%20Sen"> Subhankar Sen</a> </p> <p class="card-text"><strong>Abstract:</strong></p> The bifurcation curve of separation in steady two-dimensional viscous flow past an elliptic cylinder is studied by varying the angle of incidence (α) with different aspect ratio (ratio of minor to major axis). The solutions are based on numerical investigation, using finite element analysis, of the Navier-Stokes equations for incompressible flow. Results are presented for Reynolds number up to 50 and angle of incidence varies from 0° to 90°. Range of aspect ratio (Ar) is from 0.1 to 1 (in steps of 0.1) and flow is considered as unbounded flow. Bifurcation curve represents the locus of Reynolds numbers (Res) at which flow detaches or separates from the surface of the body at a given α and Ar. In earlier studies, effect of Ar on laminar separation curve or bifurcation curve is limited for Ar = 0.1, 0.2, 0.5 and 0.8. Some results are also available at α = 90° and 45°. The present study attempts to provide a systematic data and clear understanding on the effect of Ar at bifurcation curve and its point of maxima. In addition, issues regarding location of separation angle and maximum ratio of coefficient of lift to drag are studied. We found that nature of curve, separation angle and maximum ratio of lift to drag changes considerably with respect to change in Ar. <p class="card-text"><strong>Keywords:</strong> <a href="https://publications.waset.org/abstracts/search?q=aspect%20ratio" title="aspect ratio">aspect ratio</a>, <a href="https://publications.waset.org/abstracts/search?q=bifurcation%20curve" title=" bifurcation curve"> bifurcation curve</a>, <a href="https://publications.waset.org/abstracts/search?q=elliptic%20cylinder" title=" elliptic cylinder"> elliptic cylinder</a>, <a href="https://publications.waset.org/abstracts/search?q=GMRES" title=" GMRES"> GMRES</a>, <a href="https://publications.waset.org/abstracts/search?q=stabilized%20finite-element" title=" stabilized finite-element"> stabilized finite-element</a> </p> <a href="https://publications.waset.org/abstracts/40551/study-of-bifurcation-curve-with-aspect-ratio-at-low-reynolds-number" class="btn btn-primary btn-sm">Procedia</a> <a href="https://publications.waset.org/abstracts/40551.pdf" target="_blank" class="btn btn-primary btn-sm">PDF</a> <span class="bg-info text-light px-1 py-1 float-right rounded"> Downloads <span class="badge badge-light">343</span> </span> </div> </div> <div class="card paper-listing mb-3 mt-3"> <h5 class="card-header" style="font-size:.9rem"><span class="badge badge-info">7353</span> Choosing between the Regression Correlation, the Rank Correlation, and the Correlation Curve</h5> <div class="card-body"> <p class="card-text"><strong>Authors:</strong> <a href="https://publications.waset.org/abstracts/search?q=Roger%20L.%20Goodwin">Roger L. Goodwin</a> </p> <p class="card-text"><strong>Abstract:</strong></p> This paper presents a rank correlation curve. The traditional correlation coefficient is valid for both continuous variables and for integer variables using rank statistics. Since the correlation coefficient has already been established in rank statistics by Spearman, such a calculation can be extended to the correlation curve. This paper presents two survey questions. The survey collected non-continuous variables. We will show weak to moderate correlation. Obviously, one question has a negative effect on the other. A review of the qualitative literature can answer which question and why. The rank correlation curve shows which collection of responses has a positive slope and which collection of responses has a negative slope. Such information is unavailable from the flat, "first-glance" correlation statistics. <p class="card-text"><strong>Keywords:</strong> <a href="https://publications.waset.org/abstracts/search?q=Bayesian%20estimation" title="Bayesian estimation">Bayesian estimation</a>, <a href="https://publications.waset.org/abstracts/search?q=regression%20model" title=" regression model"> regression model</a>, <a href="https://publications.waset.org/abstracts/search?q=rank%20statistics" title=" rank statistics"> rank statistics</a>, <a href="https://publications.waset.org/abstracts/search?q=correlation" title=" correlation"> correlation</a>, <a href="https://publications.waset.org/abstracts/search?q=correlation%20curve" title=" correlation curve"> correlation curve</a> </p> <a href="https://publications.waset.org/abstracts/9847/choosing-between-the-regression-correlation-the-rank-correlation-and-the-correlation-curve" class="btn btn-primary btn-sm">Procedia</a> <a href="https://publications.waset.org/abstracts/9847.pdf" target="_blank" class="btn btn-primary btn-sm">PDF</a> <span class="bg-info text-light px-1 py-1 float-right rounded"> Downloads <span class="badge badge-light">477</span> </span> </div> </div> <div class="card paper-listing mb-3 mt-3"> <h5 class="card-header" style="font-size:.9rem"><span class="badge badge-info">7352</span> Fracture Toughness Characterizations of Single Edge Notch (SENB) Testing Using DIC System</h5> <div class="card-body"> <p class="card-text"><strong>Authors:</strong> <a href="https://publications.waset.org/abstracts/search?q=Amr%20Mohamadien">Amr Mohamadien</a>, <a href="https://publications.waset.org/abstracts/search?q=Ali%20Imanpour"> Ali Imanpour</a>, <a href="https://publications.waset.org/abstracts/search?q=Sylvester%20Agbo"> Sylvester Agbo</a>, <a href="https://publications.waset.org/abstracts/search?q=Nader%20Yoosef-Ghodsi"> Nader Yoosef-Ghodsi</a>, <a href="https://publications.waset.org/abstracts/search?q=Samer%20Adeeb"> Samer Adeeb</a> </p> <p class="card-text"><strong>Abstract:</strong></p> The fracture toughness resistance curve (e.g., J-R curve and crack tip opening displacement (CTOD) or δ-R curve) is important in facilitating strain-based design and integrity assessment of oil and gas pipelines. This paper aims to present laboratory experimental data to characterize the fracture behavior of pipeline steel. The influential parameters associated with the fracture of API 5L X52 pipeline steel, including different initial crack sizes, were experimentally investigated for a single notch edge bend (SENB). A total of 9 small-scale specimens with different crack length to specimen depth ratios were conducted and tested using single edge notch bending (SENB). ASTM E1820 and BS7448 provide testing procedures to construct the fracture resistance curve (Load-CTOD, CTOD-R, or J-R) from test results. However, these procedures are limited by standard specimens’ dimensions, displacement gauges, and calibration curves. To overcome these limitations, this paper presents the use of small-scale specimens and a 3D-digital image correlation (DIC) system to extract the parameters required for fracture toughness estimation. Fracture resistance curve parameters in terms of crack mouth open displacement (CMOD), crack tip opening displacement (CTOD), and crack growth length (∆a) were carried out from test results by utilizing the DIC system, and an improved regression fitting resistance function (CTOD Vs. crack growth), or (J-integral Vs. crack growth) that is dependent on a variety of initial crack sizes was constructed and presented. The obtained results were compared to the available results of the classical physical measurement techniques, and acceptable matchings were observed. Moreover, a case study was implemented to estimate the maximum strain value that initiates the stable crack growth. This might be of interest to developing more accurate strain-based damage models. The results of laboratory testing in this study offer a valuable database to develop and validate damage models that are able to predict crack propagation of pipeline steel, accounting for the influential parameters associated with fracture toughness. <p class="card-text"><strong>Keywords:</strong> <a href="https://publications.waset.org/abstracts/search?q=fracture%20toughness" title="fracture toughness">fracture toughness</a>, <a href="https://publications.waset.org/abstracts/search?q=crack%20propagation%20in%20pipeline%20steels" title=" crack propagation in pipeline steels"> crack propagation in pipeline steels</a>, <a href="https://publications.waset.org/abstracts/search?q=CTOD-R" title=" CTOD-R"> CTOD-R</a>, <a href="https://publications.waset.org/abstracts/search?q=strain-based%20damage%20model" title=" strain-based damage model"> strain-based damage model</a> </p> <a href="https://publications.waset.org/abstracts/181490/fracture-toughness-characterizations-of-single-edge-notch-senb-testing-using-dic-system" class="btn btn-primary btn-sm">Procedia</a> <a href="https://publications.waset.org/abstracts/181490.pdf" target="_blank" class="btn btn-primary btn-sm">PDF</a> <span class="bg-info text-light px-1 py-1 float-right rounded"> Downloads <span class="badge badge-light">63</span> </span> </div> </div> <div class="card paper-listing mb-3 mt-3"> <h5 class="card-header" style="font-size:.9rem"><span class="badge badge-info">7351</span> Representation of the Solution of One Dynamical System on the Plane</h5> <div class="card-body"> <p class="card-text"><strong>Authors:</strong> <a href="https://publications.waset.org/abstracts/search?q=Kushakov%20Kholmurodjon">Kushakov Kholmurodjon</a>, <a href="https://publications.waset.org/abstracts/search?q=Muhammadjonov%20Akbarshox"> Muhammadjonov Akbarshox</a> </p> <p class="card-text"><strong>Abstract:</strong></p> This present paper is devoted to a system of second-order nonlinear differential equations with a special right-hand side, exactly, the linear part and a third-order polynomial of a special form. It is shown that for some relations between the parameters, there is a second-order curve in which trajectories leaving the points of this curve remain in the same place. Thus, the curve is invariant with respect to the given system. Moreover, this system is invariant under a non-degenerate linear transformation of variables. The form of this curve, depending on the relations between the parameters and the eigenvalues of the matrix, is proved. All solutions of this system of differential equations are shown analytically. <p class="card-text"><strong>Keywords:</strong> <a href="https://publications.waset.org/abstracts/search?q=dynamic%20system" title="dynamic system">dynamic system</a>, <a href="https://publications.waset.org/abstracts/search?q=ellipse" title=" ellipse"> ellipse</a>, <a href="https://publications.waset.org/abstracts/search?q=hyperbola" title=" hyperbola"> hyperbola</a>, <a href="https://publications.waset.org/abstracts/search?q=Hess%20system" title=" Hess system"> Hess system</a>, <a href="https://publications.waset.org/abstracts/search?q=polar%20coordinate%20system" title=" polar coordinate system"> polar coordinate system</a> </p> <a href="https://publications.waset.org/abstracts/140142/representation-of-the-solution-of-one-dynamical-system-on-the-plane" class="btn btn-primary btn-sm">Procedia</a> <a href="https://publications.waset.org/abstracts/140142.pdf" target="_blank" class="btn btn-primary btn-sm">PDF</a> <span class="bg-info text-light px-1 py-1 float-right rounded"> Downloads <span class="badge badge-light">193</span> </span> </div> </div> <div class="card paper-listing mb-3 mt-3"> <h5 class="card-header" style="font-size:.9rem"><span class="badge badge-info">7350</span> A Bathtub Curve from Nonparametric Model</h5> <div class="card-body"> <p class="card-text"><strong>Authors:</strong> <a href="https://publications.waset.org/abstracts/search?q=Eduardo%20C.%20Guardia">Eduardo C. Guardia</a>, <a href="https://publications.waset.org/abstracts/search?q=Jose%20W.%20M.%20Lima"> Jose W. M. Lima</a>, <a href="https://publications.waset.org/abstracts/search?q=Afonso%20H.%20M.%20Santos"> Afonso H. M. Santos</a> </p> <p class="card-text"><strong>Abstract:</strong></p> This paper presents a nonparametric method to obtain the hazard rate “Bathtub curve” for power system components. The model is a mixture of the three known phases of a component life, the decreasing failure rate (DFR), the constant failure rate (CFR) and the increasing failure rate (IFR) represented by three parametric Weibull models. The parameters are obtained from a simultaneous fitting process of the model to the Kernel nonparametric hazard rate curve. From the Weibull parameters and failure rate curves the useful lifetime and the characteristic lifetime were defined. To demonstrate the model the historic time-to-failure of distribution transformers were used as an example. The resulted “Bathtub curve” shows the failure rate for the equipment lifetime which can be applied in economic and replacement decision models. <p class="card-text"><strong>Keywords:</strong> <a href="https://publications.waset.org/abstracts/search?q=bathtub%20curve" title="bathtub curve">bathtub curve</a>, <a href="https://publications.waset.org/abstracts/search?q=failure%20analysis" title=" failure analysis"> failure analysis</a>, <a href="https://publications.waset.org/abstracts/search?q=lifetime%20estimation" title=" lifetime estimation"> lifetime estimation</a>, <a href="https://publications.waset.org/abstracts/search?q=parameter%20estimation" title=" parameter estimation"> parameter estimation</a>, <a href="https://publications.waset.org/abstracts/search?q=Weibull%20distribution" title=" Weibull distribution"> Weibull distribution</a> </p> <a href="https://publications.waset.org/abstracts/10780/a-bathtub-curve-from-nonparametric-model" class="btn btn-primary btn-sm">Procedia</a> <a href="https://publications.waset.org/abstracts/10780.pdf" target="_blank" class="btn btn-primary btn-sm">PDF</a> <span class="bg-info text-light px-1 py-1 float-right rounded"> Downloads <span class="badge badge-light">446</span> </span> </div> </div> <div class="card paper-listing mb-3 mt-3"> <h5 class="card-header" style="font-size:.9rem"><span class="badge badge-info">7349</span> Weighted G2 Multi-Degree Reduction of Bezier Curves</h5> <div class="card-body"> <p class="card-text"><strong>Authors:</strong> <a href="https://publications.waset.org/abstracts/search?q=Salisu%20ibrahim">Salisu ibrahim</a>, <a href="https://publications.waset.org/abstracts/search?q=Abdalla%20Rababah"> Abdalla Rababah</a> </p> <p class="card-text"><strong>Abstract:</strong></p> In this research, we use Weighted G2-Multi-degree reduction of Bezier curve of degree n to a Bezier curve of degree m, m < n. The degree reduction of Bezier curves is used to represent a given Bezier curve of n by a Bezier curve of degree m, m < n. Exact degree reduction is not possible, and degree reduction is approximate process in nature. We derive a weighted degree reducing method that is geometrically continuous at the end points. Different norms will be considered, several error minimizations will be given. The proposed methods produce error function that are less than the errors of existing methods. <p class="card-text"><strong>Keywords:</strong> <a href="https://publications.waset.org/abstracts/search?q=Bezier%20curves" title="Bezier curves">Bezier curves</a>, <a href="https://publications.waset.org/abstracts/search?q=multiple%20degree%20reduction" title=" multiple degree reduction"> multiple degree reduction</a>, <a href="https://publications.waset.org/abstracts/search?q=geometric%20continuity" title=" geometric continuity"> geometric continuity</a>, <a href="https://publications.waset.org/abstracts/search?q=error%20function" title=" error function"> error function</a> </p> <a href="https://publications.waset.org/abstracts/18669/weighted-g2-multi-degree-reduction-of-bezier-curves" class="btn btn-primary btn-sm">Procedia</a> <a href="https://publications.waset.org/abstracts/18669.pdf" target="_blank" class="btn btn-primary btn-sm">PDF</a> <span class="bg-info text-light px-1 py-1 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