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source depletion</title> <meta name="description" content="Search results for: spring source depletion"> <meta name="keywords" content="spring source depletion"> <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 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action="https://publications.waset.org/abstracts/search"> <div 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="spring source depletion"> <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> 5422</div> </div> </div> </div> <h1 class="mt-3 mb-3 text-center" style="font-size:1.6rem;">Search results for: spring source depletion</h1> <div class="card paper-listing mb-3 mt-3"> <h5 class="card-header" style="font-size:.9rem"><span class="badge badge-info">5422</span> A Comparative Study of Standard, Casted, and Riveted Eye Design of a Mono Leaf Spring Using CAE Tools</h5> <div class="card-body"> <p class="card-text"><strong>Authors:</strong> <a href="https://publications.waset.org/abstracts/search?q=Gian%20Bhushan">Gian Bhushan</a>, <a href="https://publications.waset.org/abstracts/search?q=Vinkel%20Arora"> Vinkel Arora</a>, <a href="https://publications.waset.org/abstracts/search?q=M.%20L.%20Aggarwal"> M. L. Aggarwal</a> </p> <p class="card-text"><strong>Abstract:</strong></p> The objective of the present study is to determine better eye end design of a mono leaf spring used in light motor vehicle. A conventional 65Si7 spring steel leaf spring model with standard eye, casted and riveted eye end are considered. The CAD model of the leaf springs is prepared in CATIA and analyzed using ANSYS. The standard eye, casted, and riveted eye leaf springs are subjected to similar loading conditions. The CAE analysis of the leaf spring is performed for various parameters like deflection and Von-Mises stress. Mass reduction of 62.9% is achieved in case of riveted eye mono leaf spring as compared to standard eye mono leaf spring for the same loading conditions. <p class="card-text"><strong>Keywords:</strong> <a href="https://publications.waset.org/abstracts/search?q=CAE" title="CAE">CAE</a>, <a href="https://publications.waset.org/abstracts/search?q=leaf%20spring" title=" leaf spring"> leaf spring</a>, <a href="https://publications.waset.org/abstracts/search?q=standard" title=" standard"> standard</a>, <a href="https://publications.waset.org/abstracts/search?q=casted" title=" casted"> casted</a>, <a href="https://publications.waset.org/abstracts/search?q=riveted%20eye" title=" riveted eye"> riveted eye</a> </p> <a href="https://publications.waset.org/abstracts/15462/a-comparative-study-of-standard-casted-and-riveted-eye-design-of-a-mono-leaf-spring-using-cae-tools" class="btn btn-primary btn-sm">Procedia</a> <a href="https://publications.waset.org/abstracts/15462.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">371</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">5421</span> Technological Value of Selected Spring Wheat Cultivars Depending on the Sowing Date</h5> <div class="card-body"> <p class="card-text"><strong>Authors:</strong> <a href="https://publications.waset.org/abstracts/search?q=Marta%20Wyzi%C5%84ska">Marta Wyzińska</a>, <a href="https://publications.waset.org/abstracts/search?q=Jerzy%20Grabi%C5%84ski"> Jerzy Grabiński</a>, <a href="https://publications.waset.org/abstracts/search?q=Alicja%20Su%C5%82ek"> Alicja Sułek</a> </p> <p class="card-text"><strong>Abstract:</strong></p> The grain quality is a decisive factor in its use. In Poland, spring wheat is characterized by more favorable quality parameters in relation to the winter form of this species. In the present study, the effects of three different sowing dates (autumn, delayed autumn, and spring) and cultivar (Tybalt, Cytra, Bombona, Monsun, and Parabola) on the selected technological value parameters of spring wheat over three years were studied. The field trials were carried out in two locations (Bezek, Czesławice) in the Lubelskie Vivodeship, Poland. It was found that the falling number of spring wheat grains from autumn sowing dates was at a similar level to wheat sown in spring. The amount of wet gluten in the grain was variable in years, and its quality was better in wheat sown in spring. Sedimentation index was dependent upon on the cultivar. <p class="card-text"><strong>Keywords:</strong> <a href="https://publications.waset.org/abstracts/search?q=Sowing%20term" title="Sowing term">Sowing term</a>, <a href="https://publications.waset.org/abstracts/search?q=spring%20wheat" title=" spring wheat"> spring wheat</a>, <a href="https://publications.waset.org/abstracts/search?q=technological%20value" title=" technological value"> technological value</a>, <a href="https://publications.waset.org/abstracts/search?q=quality" title=" quality"> quality</a> </p> <a href="https://publications.waset.org/abstracts/104669/technological-value-of-selected-spring-wheat-cultivars-depending-on-the-sowing-date" class="btn btn-primary btn-sm">Procedia</a> <a href="https://publications.waset.org/abstracts/104669.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">160</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">5420</span> Robust Control Design and Analysis Using SCILAB for a Mass-Spring-Damper System</h5> <div class="card-body"> <p class="card-text"><strong>Authors:</strong> <a href="https://publications.waset.org/abstracts/search?q=Yoonsoo%20Kim">Yoonsoo Kim</a> </p> <p class="card-text"><strong>Abstract:</strong></p> This paper introduces an open-source software package SCILAB, an alternative of MATLAB, which can be used for robust control design and analysis of a typical mass-spring-damper (MSD) system. Using the previously published ideas in this popular mechanical system is considered to provide another example of usefulness of SCILAB for advanced control design. <p class="card-text"><strong>Keywords:</strong> <a href="https://publications.waset.org/abstracts/search?q=robust%20control" title="robust control">robust control</a>, <a href="https://publications.waset.org/abstracts/search?q=SCILAB" title=" SCILAB"> SCILAB</a>, <a href="https://publications.waset.org/abstracts/search?q=mass-spring-damper%20%28MSD%29" title=" mass-spring-damper (MSD)"> mass-spring-damper (MSD)</a>, <a href="https://publications.waset.org/abstracts/search?q=popular%20mechanical%20systems" title=" popular mechanical systems"> popular mechanical systems</a> </p> <a href="https://publications.waset.org/abstracts/1958/robust-control-design-and-analysis-using-scilab-for-a-mass-spring-damper-system" class="btn btn-primary btn-sm">Procedia</a> <a href="https://publications.waset.org/abstracts/1958.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">472</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">5419</span> A Variable Stiffness Approach to Vibration Control</h5> <div class="card-body"> <p class="card-text"><strong>Authors:</strong> <a href="https://publications.waset.org/abstracts/search?q=S.%20A.%20Alotaibi">S. A. Alotaibi</a>, <a href="https://publications.waset.org/abstracts/search?q=M.%20A.%20Al-Ajmi"> M. A. Al-Ajmi</a> </p> <p class="card-text"><strong>Abstract:</strong></p> This work introduces a new concept for controlling the mechanical vibrations via variable stiffness coil spring. The concept relies on fitting a screw though the spring to change the number of active spring coils. A prototype has been built and tested with promising results toward an innovation in the field of vibration control. <p class="card-text"><strong>Keywords:</strong> <a href="https://publications.waset.org/abstracts/search?q=variable%20stiffness" title="variable stiffness">variable stiffness</a>, <a href="https://publications.waset.org/abstracts/search?q=coil%20spring" title=" coil spring"> coil spring</a>, <a href="https://publications.waset.org/abstracts/search?q=vibration%20control" title=" vibration control"> vibration control</a>, <a href="https://publications.waset.org/abstracts/search?q=computer%20science" title=" computer science"> computer science</a> </p> <a href="https://publications.waset.org/abstracts/5909/a-variable-stiffness-approach-to-vibration-control" class="btn btn-primary btn-sm">Procedia</a> <a href="https://publications.waset.org/abstracts/5909.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">407</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">5418</span> Tourism Potentials of Ikogosi Warm Spring in Nigeria</h5> <div class="card-body"> <p class="card-text"><strong>Authors:</strong> <a href="https://publications.waset.org/abstracts/search?q=A.I.%20Adeyemo">A.I. Adeyemo</a> </p> <p class="card-text"><strong>Abstract:</strong></p> Ikogosi warm spring results from a complex mechanical and chemical forces that generates internal heat in the rocks forming a warm and cold water at the same geographical location at the same time. From time immemorial, the local community had thought, it to be the work of a deity, and they were worshipping the spring. This complex phenomenon has been a source of tourist attraction to both local and international tourists over the years. 450 copies of a structured questionnaire were given out, and a total of 500 respondents were interviewed. The result showed that ikogosi warm spring impacts the community positively by providing employment to the teeming youths, and it provides income to traders. The result shows that 66% of the respondents confirmed that it increased their income and that transportation business increased more than 73%.the level of enlightenment and socialization increased greatly in the community. However, it also impacted the community negatively as it increased crime rates such as stealing, kidnapping, prostitution, and unwanted pregnancy among the secondary school girls and the other teenagers. Generally, 50% of the respondents reported that tourism in the warm spring results in insecurity in the community. IT also increased environmental problems such as noise and waste pollutions; the continuous movement on the land results in soil compartment leading to erosion, and leaching, which also results in loss of soil fertility. It was concluded that if the potentials of the spring are fully tapped, it will be a good avenue for income generation to the country. <p class="card-text"><strong>Keywords:</strong> <a href="https://publications.waset.org/abstracts/search?q=community" title="community">community</a>, <a href="https://publications.waset.org/abstracts/search?q=Ikogosi" title=" Ikogosi"> Ikogosi</a>, <a href="https://publications.waset.org/abstracts/search?q=revenue" title=" revenue"> revenue</a>, <a href="https://publications.waset.org/abstracts/search?q=warm%20spring" title=" warm spring"> warm spring</a> </p> <a href="https://publications.waset.org/abstracts/118013/tourism-potentials-of-ikogosi-warm-spring-in-nigeria" class="btn btn-primary btn-sm">Procedia</a> <a href="https://publications.waset.org/abstracts/118013.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">159</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">5417</span> Identifying Karst Pattern to Prevent Bell Spring from Being Submerged in Daryan Dam Reservoir </h5> <div class="card-body"> <p class="card-text"><strong>Authors:</strong> <a href="https://publications.waset.org/abstracts/search?q=H.%20Shafaattalab%20Dehghani">H. Shafaattalab Dehghani</a>, <a href="https://publications.waset.org/abstracts/search?q=H.%20R.%20Zarei"> H. R. Zarei </a> </p> <p class="card-text"><strong>Abstract:</strong></p> The large karstic Bell spring with a discharge ranging between 250 and 5300 lit/ sec is one of the most important springs of Kermanshah Province. This spring supplies drinking water of Nodsheh City and its surrounding villages. The spring is located in the reservoir of Daryan Dam and its mouth would be submerged after impounding under a water column of about 110 m height. This paper has aimed to render an account of the karstification pattern around the spring under consideration with the intention of preventing Bell Spring from being submerged in Daryan Dam Reservoir. The studies comprise engineering geology and hydrogeology investigations. Some geotechnical activities included in these studies include geophysical studies, drilling, excavation of exploratory gallery and shaft and diving. The results depict that Bell is a single-conduit siphon spring with 4 m diameter and 85 m height that 32 m of the conduit is located below the spring outlet. To survive the spring, it was decided to plug the outlet and convey the water to upper elevations under the natural pressure of the aquifer. After plugging, water was successfully conveyed to elevation 837 meter above sea level (about 120 m from the outlet) under the natural pressure of the aquifer. This signifies the accuracy of the studies done and proper recognition of the karstification pattern of Bell Spring. This is a unique experience in karst problems in Iran. <p class="card-text"><strong>Keywords:</strong> <a href="https://publications.waset.org/abstracts/search?q=bell%20spring" title="bell spring">bell spring</a>, <a href="https://publications.waset.org/abstracts/search?q=Karst" title=" Karst"> Karst</a>, <a href="https://publications.waset.org/abstracts/search?q=Daryan%20Dam" title=" Daryan Dam"> Daryan Dam</a>, <a href="https://publications.waset.org/abstracts/search?q=submerged" title=" submerged"> submerged</a> </p> <a href="https://publications.waset.org/abstracts/45230/identifying-karst-pattern-to-prevent-bell-spring-from-being-submerged-in-daryan-dam-reservoir" class="btn btn-primary btn-sm">Procedia</a> <a href="https://publications.waset.org/abstracts/45230.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">274</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">5416</span> Characteristics and Durability Evaluation of Air Spring</h5> <div class="card-body"> <p class="card-text"><strong>Authors:</strong> <a href="https://publications.waset.org/abstracts/search?q=Chang%20Su%20Woo">Chang Su Woo</a>, <a href="https://publications.waset.org/abstracts/search?q=Hyun%20Sung%20Park"> Hyun Sung Park</a> </p> <p class="card-text"><strong>Abstract:</strong></p> Air spring system is widely accepted for railway vehicle secondary suspension to reduce and absorb the vibration and noise. The low natural frequency ensures a comfortable ride and an invariably good stiffness. In this paper, the characteristic and durability test was conducted in laboratory by using servo-hydraulic fatigue testing system to reliability evaluation of air spring for electric railway vehicle. The experimental results show that the characteristics and durability of domestically developed products are excellent. Moreover, to guarantee the adaption of air spring, the ride comfort and air pressure variation were measured in train test on subway line. Air spring developed by this study for railway vehicles can guarantee the reliability of average usage of 1 million times at 90% confidence level. <p class="card-text"><strong>Keywords:</strong> <a href="https://publications.waset.org/abstracts/search?q=air%20spring" title="air spring">air spring</a>, <a href="https://publications.waset.org/abstracts/search?q=reliability" title=" reliability"> reliability</a>, <a href="https://publications.waset.org/abstracts/search?q=railway" title=" railway"> railway</a>, <a href="https://publications.waset.org/abstracts/search?q=service%20lifetime" title=" service lifetime"> service lifetime</a> </p> <a href="https://publications.waset.org/abstracts/60068/characteristics-and-durability-evaluation-of-air-spring" class="btn btn-primary btn-sm">Procedia</a> <a href="https://publications.waset.org/abstracts/60068.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">476</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">5415</span> Depletion Layer Parameters of Al-MoO3-P-CdTe-Al MOS Structures</h5> <div class="card-body"> <p class="card-text"><strong>Authors:</strong> <a href="https://publications.waset.org/abstracts/search?q=A.%20C.%20Sarmah">A. C. Sarmah</a> </p> <p class="card-text"><strong>Abstract:</strong></p> The Al-MoO3-P-CdTe-Al MOS sandwich structures were fabricated by vacuum deposition method on cleaned glass substrates. Capacitance versus voltage measurements were performed at different frequencies and sweep rates of applied voltages for oxide and semiconductor films of different thicknesses. In the negative voltage region of the C-V curve a high differential capacitance of the semiconductor was observed and at high frequencies (<10 kHz) the transition from accumulation to depletion and further to deep depletion was observed as the voltage was swept from negative to positive. A study have been undertaken to determine the value of acceptor density and some depletion layer parameters such as depletion layer capacitance, depletion width, impurity concentration, flat band voltage, Debye length, flat band capacitance, diffusion or built-in-potential, space charge per unit area etc. These were determined from C-V measurements for different oxide and semiconductor thicknesses. <p class="card-text"><strong>Keywords:</strong> <a href="https://publications.waset.org/abstracts/search?q=debye%20length" title="debye length">debye length</a>, <a href="https://publications.waset.org/abstracts/search?q=depletion%20width" title=" depletion width"> depletion width</a>, <a href="https://publications.waset.org/abstracts/search?q=flat%20band%20capacitance" title=" flat band capacitance"> flat band capacitance</a>, <a href="https://publications.waset.org/abstracts/search?q=impurity%20concentration" title=" impurity concentration"> impurity concentration</a> </p> <a href="https://publications.waset.org/abstracts/17976/depletion-layer-parameters-of-al-moo3-p-cdte-al-mos-structures" class="btn btn-primary btn-sm">Procedia</a> <a href="https://publications.waset.org/abstracts/17976.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">451</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">5414</span> Fracture and Dynamic Behavior of Leaf Spring Suspension</h5> <div class="card-body"> <p class="card-text"><strong>Authors:</strong> <a href="https://publications.waset.org/abstracts/search?q=S.%20Lecheb">S. Lecheb</a>, <a href="https://publications.waset.org/abstracts/search?q=A.%20Chellil"> A. Chellil</a>, <a href="https://publications.waset.org/abstracts/search?q=H.%20Mechakra"> H. Mechakra</a>, <a href="https://publications.waset.org/abstracts/search?q=S.%20Attou"> S. Attou</a>, <a href="https://publications.waset.org/abstracts/search?q=H.%20Kebir"> H. Kebir</a> </p> <p class="card-text"><strong>Abstract:</strong></p> Although leaf springs are one of the oldest suspension components they are still frequently used, especially in commercial vehicles. Being able to capture the leaf spring characteristics is of significant importance for vehicle handling dynamics studies. The main function of leaf spring is not only to support vertical load but also to isolate road induced vibrations. It is subjected to millions of load cycles leading to fatigue failure. It needs to have excellent fatigue life. The objective of this work is its use of Abaqus software to locate the most stressed areas and predict the areas in which it occurs in fatigue and crack of leaf spring and calculate the stress and frequencies of this model. <p class="card-text"><strong>Keywords:</strong> <a href="https://publications.waset.org/abstracts/search?q=leaf%20spring" title="leaf spring">leaf spring</a>, <a href="https://publications.waset.org/abstracts/search?q=crack" title=" crack"> crack</a>, <a href="https://publications.waset.org/abstracts/search?q=stress" title=" stress"> stress</a>, <a href="https://publications.waset.org/abstracts/search?q=natural%20frequencies" title=" natural frequencies"> natural frequencies</a> </p> <a href="https://publications.waset.org/abstracts/42368/fracture-and-dynamic-behavior-of-leaf-spring-suspension" class="btn btn-primary btn-sm">Procedia</a> <a href="https://publications.waset.org/abstracts/42368.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">463</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">5413</span> Useful Lifetime Prediction of Chevron Rubber Spring for Railway Vehicle</h5> <div class="card-body"> <p class="card-text"><strong>Authors:</strong> <a href="https://publications.waset.org/abstracts/search?q=Chang%20Su%20Woo">Chang Su Woo</a>, <a href="https://publications.waset.org/abstracts/search?q=Hyun%20Sung%20Park"> Hyun Sung Park</a> </p> <p class="card-text"><strong>Abstract:</strong></p> Useful lifetime evaluation of chevron rubber spring was very important in design procedure to assure the safety and reliability. It is, therefore, necessary to establish a suitable criterion for the replacement period of chevron rubber spring. In this study, we performed characteristic analysis and useful lifetime prediction of chevron rubber spring. Rubber material coefficient was obtained by curve fittings of uni-axial tension, equi bi-axial tension and pure shear test. Computer simulation was executed to predict and evaluate the load capacity and stiffness for chevron rubber spring. In order to useful lifetime prediction of rubber material, we carried out the compression set with heat aging test in an oven at the temperature ranging from 50°C to 100°C during a period 180 days. By using the Arrhenius plot, several useful lifetime prediction equations for rubber material was proposed. <p class="card-text"><strong>Keywords:</strong> <a href="https://publications.waset.org/abstracts/search?q=chevron%20rubber%20spring" title="chevron rubber spring">chevron rubber spring</a>, <a href="https://publications.waset.org/abstracts/search?q=material%20coefficient" title=" material coefficient"> material coefficient</a>, <a href="https://publications.waset.org/abstracts/search?q=finite%20element%20analysis" title=" finite element analysis"> finite element analysis</a>, <a href="https://publications.waset.org/abstracts/search?q=useful%20lifetime%20prediction" title=" useful lifetime prediction"> useful lifetime prediction</a> </p> <a href="https://publications.waset.org/abstracts/33892/useful-lifetime-prediction-of-chevron-rubber-spring-for-railway-vehicle" class="btn btn-primary btn-sm">Procedia</a> <a href="https://publications.waset.org/abstracts/33892.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">568</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">5412</span> The Hydro-Geology and Drinking Water Quality of Ikogosi Warm Spring in South West Nigeria</h5> <div class="card-body"> <p class="card-text"><strong>Authors:</strong> <a href="https://publications.waset.org/abstracts/search?q=Ikudayisi%20Akinola">Ikudayisi Akinola</a>, <a href="https://publications.waset.org/abstracts/search?q=Adeyemo%20Folasade"> Adeyemo Folasade</a>, <a href="https://publications.waset.org/abstracts/search?q=Adeyemo%20Josiah"> Adeyemo Josiah</a> </p> <p class="card-text"><strong>Abstract:</strong></p> This study focuses on the hydro-geology and chemistry of Ikogosi Warm Spring in South West Nigeria. Ikogosi warm spring is a global tourist attraction because it has both warm and cold spring sources. Water samples from the cold spring, warm spring and the meeting point were collected, analyzed and the result shows close similarity in temperature, hydrogen iron concentration (pH), alkalinity, hardness, Calcium, Magnesium, Sodium, Iron, total dissolved solid and heavy metals. The measured parameters in the water samples are within World Health Organisation standards for fresh water. The study of the geology of the warm spring reveals that the study area is underlain by a group of slightly migmatised to non-migmatised paraschists and meta-igneous rocks. The concentration levels of selected heavy metals, (Copper, Cadmium, Zinc, Arsenic and Cromium) were determined in the water (ppm) samples. Chromium had the highest concentration value of 1.52ppm (an average of 49.67%) and Cadmium had the lowest concentration with value of 0.15ppm (an average of 4.89%). Comparison of these results showed that, their mean levels are within the standard values obtained in Nigeria. It can be concluded that both warm and spring water are safe for drinking. <p class="card-text"><strong>Keywords:</strong> <a href="https://publications.waset.org/abstracts/search?q=cold%20spring" title="cold spring">cold spring</a>, <a href="https://publications.waset.org/abstracts/search?q=Ikogosi" title=" Ikogosi"> Ikogosi</a>, <a href="https://publications.waset.org/abstracts/search?q=melting%20point" title=" melting point"> melting point</a>, <a href="https://publications.waset.org/abstracts/search?q=warm%20spring" title=" warm spring"> warm spring</a>, <a href="https://publications.waset.org/abstracts/search?q=water%20samples" title=" water samples"> water samples</a> </p> <a href="https://publications.waset.org/abstracts/27501/the-hydro-geology-and-drinking-water-quality-of-ikogosi-warm-spring-in-south-west-nigeria" class="btn btn-primary btn-sm">Procedia</a> <a href="https://publications.waset.org/abstracts/27501.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">546</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">5411</span> A Compact Quasi-Zero Stiffness Vibration Isolator Using Flexure-Based Spring Mechanisms Capable of Tunable Stiffness</h5> <div class="card-body"> <p class="card-text"><strong>Authors:</strong> <a href="https://publications.waset.org/abstracts/search?q=Thanh-Phong%20Dao">Thanh-Phong Dao</a>, <a href="https://publications.waset.org/abstracts/search?q=Shyh-Chour%20Huang"> Shyh-Chour Huang</a> </p> <p class="card-text"><strong>Abstract:</strong></p> This study presents a quasi-zero stiffness (QZS) vibration isolator using flexure-based spring mechanisms which afford both negative and positive stiffness elements, which enable self-adjustment. The QZS property of the isolator is achieved at the equilibrium position. A nonlinear mathematical model is then developed, based on the pre-compression of the flexure-based spring mechanisms. The dynamics are further analyzed using the Harmonic Balance method. The vibration attention efficiency is illustrated using displacement transmissibility, which is then compared with the corresponding linear isolator. The effects of parameters on performance are also investigated by numerical solutions. The flexure-based spring mechanisms are subsequently designed using the concept of compliant mechanisms, with evaluation by ANSYS software, and simulations of the QZS isolator. <p class="card-text"><strong>Keywords:</strong> <a href="https://publications.waset.org/abstracts/search?q=vibration%20isolator" title="vibration isolator">vibration isolator</a>, <a href="https://publications.waset.org/abstracts/search?q=quasi-zero%20stiffness" title=" quasi-zero stiffness"> quasi-zero stiffness</a>, <a href="https://publications.waset.org/abstracts/search?q=flexure-based%20spring%20mechanisms" title=" flexure-based spring mechanisms"> flexure-based spring mechanisms</a>, <a href="https://publications.waset.org/abstracts/search?q=compliant%20mechanism" title=" compliant mechanism"> compliant mechanism</a> </p> <a href="https://publications.waset.org/abstracts/45689/a-compact-quasi-zero-stiffness-vibration-isolator-using-flexure-based-spring-mechanisms-capable-of-tunable-stiffness" class="btn btn-primary btn-sm">Procedia</a> <a href="https://publications.waset.org/abstracts/45689.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">463</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">5410</span> Failure of Cable Reel Flat Spring of Crane: Beyond Fatigue Life Use</h5> <div class="card-body"> <p class="card-text"><strong>Authors:</strong> <a href="https://publications.waset.org/abstracts/search?q=Urbi%20Pal">Urbi Pal</a>, <a href="https://publications.waset.org/abstracts/search?q=Piyas%20Palit"> Piyas Palit</a>, <a href="https://publications.waset.org/abstracts/search?q=Jitendra%20Mathur"> Jitendra Mathur</a>, <a href="https://publications.waset.org/abstracts/search?q=Abhay%20Chaturvedi"> Abhay Chaturvedi</a>, <a href="https://publications.waset.org/abstracts/search?q=Sandip%20Bhattacharya"> Sandip Bhattacharya</a> </p> <p class="card-text"><strong>Abstract:</strong></p> The hot rolled slab lifting crane cable reel drum (CRD) failed due to failure of cable reel flat spring which are inside the cassette of CRD. CRD is used for the movement of tong cable. Stereoscopic observation revealed beach marks and Scanning Electron Microscopy showed striations confirming fatigue mode of failure. Chemical composition should be spring steel (Cr-Mo-V) as per IS 3431:1982 instead of C-Mn steel. To find out the reason of fatigue failure, the theoretical fatigue life of flat spiral spring has been calculated. The calculation of number of fatigue cycles included bending moment, maximum stress on the spring, ultimate tensile strength and alternative stress. The bending moment determination has been taken account with various parameters like Young’s Modulus, width, thickness, outer diameter, arbor diameter, pay out the length and angular deflection in rotations. With all the required data, the calculated fatigue life turned to be 10000 cycles, but the spring served 15000 cycles which clearly indicated beyond fatigue life usage. Different UTS values have been plotted with respect to the number of fatigue cycles and clearly showed that the increase in UTS by 40% increases fatigue life by 50%. The significance of higher UTS lied here, and higher UTS depends on modified chemistry with proper tempered martensite microstructure. This kind of failure can be easily avoided by changing the crane spring maintenance schedule from 2 years to 1.5 years considering 600 cycles per month. The plant has changed changing the schedule of cable reel spring and procured new flat reel spring made of 50CrV2 steel. <p class="card-text"><strong>Keywords:</strong> <a href="https://publications.waset.org/abstracts/search?q=cable%20reel%20spring" title="cable reel spring">cable reel spring</a>, <a href="https://publications.waset.org/abstracts/search?q=fatigue%20life" title=" fatigue life"> fatigue life</a>, <a href="https://publications.waset.org/abstracts/search?q=stress" title=" stress"> stress</a>, <a href="https://publications.waset.org/abstracts/search?q=spring%20steel" title=" spring steel"> spring steel</a> </p> <a href="https://publications.waset.org/abstracts/108278/failure-of-cable-reel-flat-spring-of-crane-beyond-fatigue-life-use" class="btn btn-primary btn-sm">Procedia</a> <a href="https://publications.waset.org/abstracts/108278.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">156</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">5409</span> A Passive Reaction Force Compensation for a Linear Motor Motion Stage Using Pre-Compressed Springs</h5> <div class="card-body"> <p class="card-text"><strong>Authors:</strong> <a href="https://publications.waset.org/abstracts/search?q=Kim%20Duc%20Hoang">Kim Duc Hoang</a>, <a href="https://publications.waset.org/abstracts/search?q=Hyeong%20Joon%20Ahn"> Hyeong Joon Ahn</a> </p> <p class="card-text"><strong>Abstract:</strong></p> Residual vibration of the system base due to a high-acceleration motion of a stage may reduce life and productivity of the manufacturing device. Although a passive RFC can reduce vibration of the system base, spring or dummy mass should be replaced to tune performance of the RFC. In this paper, we develop a novel concept of the passive RFC mechanism for a linear motor motion stage using pre-compressed springs. Dynamic characteristic of the passive RFC can be adjusted by pre-compression of the spring without exchanging the spring or dummy mass. First, we build a linear motor motion stage with pre-compressed springs. Then, the effect of the pre-compressed spring on the passive RFC is investigated by changing both pre-compressions and stiffness of springs. Finally, the effectiveness of the passive RFC using pre-compressed springs was verified with both simulations and experiments. <p class="card-text"><strong>Keywords:</strong> <a href="https://publications.waset.org/abstracts/search?q=linear%20motor%20motion%20stage" title="linear motor motion stage">linear motor motion stage</a>, <a href="https://publications.waset.org/abstracts/search?q=residual%20vibration" title=" residual vibration"> residual vibration</a>, <a href="https://publications.waset.org/abstracts/search?q=passive%20RFC" title=" passive RFC"> passive RFC</a>, <a href="https://publications.waset.org/abstracts/search?q=pre-compressed%20spring" title=" pre-compressed spring"> pre-compressed spring</a> </p> <a href="https://publications.waset.org/abstracts/63341/a-passive-reaction-force-compensation-for-a-linear-motor-motion-stage-using-pre-compressed-springs" class="btn btn-primary btn-sm">Procedia</a> <a href="https://publications.waset.org/abstracts/63341.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">354</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">5408</span> Design and Optimization of an Electromagnetic Vibration Energy Converter</h5> <div class="card-body"> <p class="card-text"><strong>Authors:</strong> <a href="https://publications.waset.org/abstracts/search?q=Slim%20Naifar">Slim Naifar</a>, <a href="https://publications.waset.org/abstracts/search?q=Sonia%20Bradai"> Sonia Bradai</a>, <a href="https://publications.waset.org/abstracts/search?q=Christian%20Viehweger"> Christian Viehweger</a>, <a href="https://publications.waset.org/abstracts/search?q=Olfa%20Kanoun"> Olfa Kanoun</a> </p> <p class="card-text"><strong>Abstract:</strong></p> Vibration provides an interesting source of energy since it is available in many indoor and outdoor applications. Nevertheless, in order to have an efficient design of the harvesting system, vibration converters have to satisfy some criterion in terms of robustness, compactness and energy outcome. In this work, an electromagnetic converter based on mechanical spring principle is proposed. The designed harvester is formed by a coil oscillating around ten ring magnets using a mechanical spring. The proposed design overcomes one of the main limitation of the moving coil by avoiding the contact between the coil wires with the mechanical spring which leads to a better robustness for the converter. In addition, the whole system can be implemented in a cavity of a screw. Different parameters in the harvester were investigated by finite element method including the magnet size, the coil winding number and diameter and the excitation frequency and amplitude. A prototype was realized and tested. Experiments were performed for 0.5 g to 1 g acceleration. The used experimental setup consists of an electrodynamic shaker as an external artificial vibration source controlled by a laser sensor to measure the applied displacement and frequency excitation. Together with the laser sensor, a controller unit, and an amplifier, the shaker is operated in a closed loop which allows controlling the vibration amplitude. The resonance frequency of the proposed designs is in the range of 24 Hz. Results indicate that the harvester can generate 612 mV and 1150 mV maximum open circuit peak to peak voltage at resonance for 0.5 g and 1 g acceleration respectively which correspond to 4.75 mW and 1.34 mW output power. Tuning the frequency to other values is also possible due to the possibility to add mass to the moving part of the or by changing the mechanical spring stiffness. <p class="card-text"><strong>Keywords:</strong> <a href="https://publications.waset.org/abstracts/search?q=energy%20harvesting" title="energy harvesting">energy harvesting</a>, <a href="https://publications.waset.org/abstracts/search?q=electromagnetic%20principle" title=" electromagnetic principle"> electromagnetic principle</a>, <a href="https://publications.waset.org/abstracts/search?q=vibration%20converter" title=" vibration converter"> vibration converter</a>, <a href="https://publications.waset.org/abstracts/search?q=moving%20coil" title=" moving coil"> moving coil</a> </p> <a href="https://publications.waset.org/abstracts/78340/design-and-optimization-of-an-electromagnetic-vibration-energy-converter" class="btn btn-primary btn-sm">Procedia</a> <a href="https://publications.waset.org/abstracts/78340.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">298</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">5407</span> A Theoretical Study of Multi-Leaf Spring in Seismic Response Control</h5> <div class="card-body"> <p class="card-text"><strong>Authors:</strong> <a href="https://publications.waset.org/abstracts/search?q=M.%20Ezati%20Kooshki">M. Ezati Kooshki </a>, <a href="https://publications.waset.org/abstracts/search?q=H.%20Pourmohamad"> H. Pourmohamad </a> </p> <p class="card-text"><strong>Abstract:</strong></p> Leaf spring dampers are used for commercial vehicles and heavy tracks. The main function of this damper in these vehicles is protection against damage and providing comfort for drivers by creating suspension between road and vehicle. This paper presents a new device, circular leaf spring damper, which is frequently used on vehicles, aiming to gain seismic protection of structures. Finite element analyses were conducted on several one-story structures using finite element software (Abaqus, v6.10-1). The time history analysis was conducted on the records of Kobe (1995) and San Fernando (1971) ground motions to demonstrate the advantages of using leaf spring in structures as compared to simple bracing system. This paper also suggests extending the use of this damper in structures, considering its large control force despite high cycle fatigue properties and low prices. <p class="card-text"><strong>Keywords:</strong> <a href="https://publications.waset.org/abstracts/search?q=bracing%20system" title="bracing system">bracing system</a>, <a href="https://publications.waset.org/abstracts/search?q=finite%20element%20analysis" title=" finite element analysis"> finite element analysis</a>, <a href="https://publications.waset.org/abstracts/search?q=leaf%20spring" title=" leaf spring"> leaf spring</a>, <a href="https://publications.waset.org/abstracts/search?q=seismic%20protection" title=" seismic protection"> seismic protection</a>, <a href="https://publications.waset.org/abstracts/search?q=time%20history%20analysis" title=" time history analysis"> time history analysis</a> </p> <a href="https://publications.waset.org/abstracts/33648/a-theoretical-study-of-multi-leaf-spring-in-seismic-response-control" class="btn btn-primary btn-sm">Procedia</a> <a href="https://publications.waset.org/abstracts/33648.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">405</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">5406</span> Optimization of Process Parameters Affecting on Spring-Back in V-Bending Process for High Strength Low Alloy Steel HSLA 420 Using FEA (HyperForm) and Taguchi Technique</h5> <div class="card-body"> <p class="card-text"><strong>Authors:</strong> <a href="https://publications.waset.org/abstracts/search?q=Navajyoti%20Panda">Navajyoti Panda</a>, <a href="https://publications.waset.org/abstracts/search?q=R.%20S.%20Pawar"> R. S. Pawar</a> </p> <p class="card-text"><strong>Abstract:</strong></p> In this study, process parameters like punch angle, die opening, grain direction, and pre-bend condition of the strip for deep draw of high strength low alloy steel HSLA 420 are investigated. The finite element method (FEM) in association with the Taguchi and the analysis of variance (ANOVA) techniques are carried out to investigate the degree of importance of process parameters in V-bending process for HSLA 420&ST12 grade material. From results, it is observed that punch angle had a major influence on the spring-back. Die opening also showed very significant role on spring back. On the other hand, it is revealed that grain direction had the least impact on spring back; however, if strip from flat sheet is taken, then it is less prone to spring back as compared to the strip from sheet metal coil. HyperForm software is used for FEM simulation and experiments are designed using Taguchi method. Percentage contribution of the parameters is obtained through the ANOVA techniques. <p class="card-text"><strong>Keywords:</strong> <a href="https://publications.waset.org/abstracts/search?q=bending" title="bending">bending</a>, <a href="https://publications.waset.org/abstracts/search?q=spring-back" title=" spring-back"> spring-back</a>, <a href="https://publications.waset.org/abstracts/search?q=v-bending" title=" v-bending"> v-bending</a>, <a href="https://publications.waset.org/abstracts/search?q=FEM" title=" FEM"> FEM</a>, <a href="https://publications.waset.org/abstracts/search?q=Taguchi" title=" Taguchi"> Taguchi</a>, <a href="https://publications.waset.org/abstracts/search?q=HSLA%20420%20and%20St12%20materials" title=" HSLA 420 and St12 materials"> HSLA 420 and St12 materials</a>, <a href="https://publications.waset.org/abstracts/search?q=HyperForm" title=" HyperForm"> HyperForm</a>, <a href="https://publications.waset.org/abstracts/search?q=profile%20projector" title=" profile projector"> profile projector</a> </p> <a href="https://publications.waset.org/abstracts/82474/optimization-of-process-parameters-affecting-on-spring-back-in-v-bending-process-for-high-strength-low-alloy-steel-hsla-420-using-fea-hyperform-and-taguchi-technique" class="btn btn-primary btn-sm">Procedia</a> <a href="https://publications.waset.org/abstracts/82474.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">189</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">5405</span> The Dynamics of Jordanian Socio-Political Satire after the Arab Spring</h5> <div class="card-body"> <p class="card-text"><strong>Authors:</strong> <a href="https://publications.waset.org/abstracts/search?q=Yousef%20Barahmeh">Yousef Barahmeh</a> </p> <p class="card-text"><strong>Abstract:</strong></p> There is a wide cultural belief that Jordanians are po-faced and unable to produce humour and satire. However, in the light of the harbingers of the Arab Spring in the early 2011, socio-political satire has thrived notably in social media as a rigorous act of critique and dissent against the institutionalized discourse. This paper seeks to explore the case study of Ahmad Hassan al-Zou’bi’s satirical articles and Facebook posts in the context of theories of satire and digital politics. Al-Zou’bi is the most prominent and prolific Jordanian satirist who rose to prominence after the Arab Spring. The analysis shows that his satirical articles provide a vintage point to the rhetoric behind the socio-political and economic reform programs as much as the adverse impact of neoliberal governments in the modern history of Jordan. <p class="card-text"><strong>Keywords:</strong> <a href="https://publications.waset.org/abstracts/search?q=Arab%20Spring" title="Arab Spring">Arab Spring</a>, <a href="https://publications.waset.org/abstracts/search?q=digital%20politics" title=" digital politics"> digital politics</a>, <a href="https://publications.waset.org/abstracts/search?q=humour%20and%20socio-political%20satire" title=" humour and socio-political satire"> humour and socio-political satire</a> </p> <a href="https://publications.waset.org/abstracts/69779/the-dynamics-of-jordanian-socio-political-satire-after-the-arab-spring" class="btn btn-primary btn-sm">Procedia</a> <a href="https://publications.waset.org/abstracts/69779.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">450</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">5404</span> Design and Analysis of Universal Multifunctional Leaf Spring Main Landing Gear for Light Aircraft</h5> <div class="card-body"> <p class="card-text"><strong>Authors:</strong> <a href="https://publications.waset.org/abstracts/search?q=Meiyuan%20Zheng">Meiyuan Zheng</a>, <a href="https://publications.waset.org/abstracts/search?q=Jingwu%20He"> Jingwu He</a>, <a href="https://publications.waset.org/abstracts/search?q=Yuexi%20Xiong"> Yuexi Xiong</a> </p> <p class="card-text"><strong>Abstract:</strong></p> A universal multi-function leaf spring main landing gear was designed for light aircraft. The main landing gear combined with the leaf spring, skidding, and wheels enables it to have a good takeoff and landing performance on various grounds such as the hard, snow, grass and sand grounds. Firstly, the characteristics of different landing sites were studied in this paper in order to analyze the load of the main landing gear on different types of grounds. Based on this analysis, the structural design optimization along with the strength and stiffness characteristics of the main landing gear has been done, which enables it to have good takeoff and landing performance on different types of grounds given the relevant regulations and standards. Additionally, the impact of the skidding on the aircraft during the flight was also taken into consideration. Finally, a universal multi-function leaf spring type of the main landing gear suitable for light aircraft has been developed. <p class="card-text"><strong>Keywords:</strong> <a href="https://publications.waset.org/abstracts/search?q=landing%20gear" title="landing gear">landing gear</a>, <a href="https://publications.waset.org/abstracts/search?q=multi-function" title=" multi-function"> multi-function</a>, <a href="https://publications.waset.org/abstracts/search?q=leaf%20spring" title=" leaf spring"> leaf spring</a>, <a href="https://publications.waset.org/abstracts/search?q=skidding" title=" skidding"> skidding</a> </p> <a href="https://publications.waset.org/abstracts/73736/design-and-analysis-of-universal-multifunctional-leaf-spring-main-landing-gear-for-light-aircraft" class="btn btn-primary btn-sm">Procedia</a> <a href="https://publications.waset.org/abstracts/73736.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">268</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">5403</span> A Consideration on the Offset Frontal Impact Modeling Using Spring-Mass Model</h5> <div class="card-body"> <p class="card-text"><strong>Authors:</strong> <a href="https://publications.waset.org/abstracts/search?q=Jaemoon%20Lim">Jaemoon Lim</a> </p> <p class="card-text"><strong>Abstract:</strong></p> To construct the lumped spring-mass model considering the occupants for the offset frontal crash, the SISAME software and the NHTSA test data were used. The data on 56 kph 40% offset frontal vehicle to deformable barrier crash test of a MY2007 Mazda 6 4-door sedan were obtained from NHTSA test database. The overall behaviors of B-pillar and engine of simulation models agreed very well with the test data. The trends of accelerations at the driver and passenger head were similar but big differences in peak values. The differences of peak values caused the large errors of the HIC36 and 3 ms chest g’s. To predict well the behaviors of dummies, the spring-mass model for the offset frontal crash needs to be improved. <p class="card-text"><strong>Keywords:</strong> <a href="https://publications.waset.org/abstracts/search?q=chest%20g%E2%80%99s" title="chest g’s">chest g’s</a>, <a href="https://publications.waset.org/abstracts/search?q=HIC36" title=" HIC36"> HIC36</a>, <a href="https://publications.waset.org/abstracts/search?q=lumped%20spring-mass%20model" title=" lumped spring-mass model"> lumped spring-mass model</a>, <a href="https://publications.waset.org/abstracts/search?q=offset%20frontal%20impact" title=" offset frontal impact"> offset frontal impact</a>, <a href="https://publications.waset.org/abstracts/search?q=SISAME" title=" SISAME"> SISAME</a> </p> <a href="https://publications.waset.org/abstracts/32557/a-consideration-on-the-offset-frontal-impact-modeling-using-spring-mass-model" class="btn btn-primary btn-sm">Procedia</a> <a href="https://publications.waset.org/abstracts/32557.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">457</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">5402</span> Shaking Table Test and Seismic Performance Evaluation of Spring Viscous Damper Cable System</h5> <div class="card-body"> <p class="card-text"><strong>Authors:</strong> <a href="https://publications.waset.org/abstracts/search?q=Asad%20Naeem">Asad Naeem</a>, <a href="https://publications.waset.org/abstracts/search?q=Jinkoo%20Kim"> Jinkoo Kim</a> </p> <p class="card-text"><strong>Abstract:</strong></p> This research proposes a self-centering passive damping system consisting of a spring viscous damper linked with a preloaded tendon. The seismic performance of the spring viscous damper is evaluated by pseudo-dynamic tests, and the results are used for the formulation of an analytical model of the damper in the structural analysis program. The shaking table tests of a two-story steel frame installed with the proposed damping system are carried out using five different earthquake records. The results from the shaking table tests are verified by numerical simulation of the retrofitted structure. The results obtained from experiments and numerical simulations demonstrate that the proposed damping system with self-centering capability is effective in reducing earthquake-induced displacement and member forces. <p class="card-text"><strong>Keywords:</strong> <a href="https://publications.waset.org/abstracts/search?q=seismic%20retrofit" title="seismic retrofit">seismic retrofit</a>, <a href="https://publications.waset.org/abstracts/search?q=spring%20viscous%20damper" title=" spring viscous damper"> spring viscous damper</a>, <a href="https://publications.waset.org/abstracts/search?q=shaking%20table%20test" title=" shaking table test"> shaking table test</a>, <a href="https://publications.waset.org/abstracts/search?q=earthquake%20resistant%20structures" title=" earthquake resistant structures"> earthquake resistant structures</a> </p> <a href="https://publications.waset.org/abstracts/97455/shaking-table-test-and-seismic-performance-evaluation-of-spring-viscous-damper-cable-system" class="btn btn-primary btn-sm">Procedia</a> <a href="https://publications.waset.org/abstracts/97455.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">180</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">5401</span> Approximate Spring Balancing for Swimming Pool Lift Mechanism to Reduce Actuator Torque</h5> <div class="card-body"> <p class="card-text"><strong>Authors:</strong> <a href="https://publications.waset.org/abstracts/search?q=Apurva%20Patil">Apurva Patil</a>, <a href="https://publications.waset.org/abstracts/search?q=Sujatha%20Srinivasan"> Sujatha Srinivasan</a> </p> <p class="card-text"><strong>Abstract:</strong></p> Reducing actuator loads is important for applications in which human effort is required for actuation. The potential benefit of applying spring balancing to rehabilitation devices which work against gravity on a nonhorizontal plane is well recognized, but practical applications have been elusive. Although existing methods provide exact spring balance, they require additional masses or auxiliary links, or all the springs used originate from the ground, which makes the resulting device bulky and space-inefficient. This paper uses a method of static balancing of mechanisms with conservative loads such as gravity and spring loads using non-zero-free-length springs and no auxiliary links. Application of this method to a manually operated swimming pool lift mechanism which lowers and raises the physically challenged users into or out of the swimming pool is presented here. Various possible configurations using extension and compression springs as well as gas spring in the mechanism are compared. This work involves approximate spring balancing of the mechanism using minimization of potential energy variance. It uses the approach of flattening the potential energy distribution over the workspace and fuses it with numerical optimization. The results show the considerable reduction in actuator torque requirement with practical spring design and arrangement. Although the method provides only an approximate balancing, it is versatile, flexible in choosing appropriate control variables that are relevant to the design problem and easy to implement. The true potential of this technique lies in the fact that it uses a very simple optimization to find the spring constant, free length of the spring and the optimal attachment points subject to the optimization constraints. Also, it uses physically realizable non-zero-free-length springs directly, thereby reducing the complexity involved in simulating zero-free-length springs from non-zero-free-length springs. This method allows springs to be attached inside the mechanism, which makes the implementation of spring balancing practical. Because auxiliary linkages can be avoided, the resultant swimming pool lift mechanism is compact. The cost benefits and reduced complexity can be significant advantages in the development of this user-actuated swimming pool lift for developing countries. <p class="card-text"><strong>Keywords:</strong> <a href="https://publications.waset.org/abstracts/search?q=gas%20spring" title="gas spring">gas spring</a>, <a href="https://publications.waset.org/abstracts/search?q=rehabilitation%20device" title=" rehabilitation device"> rehabilitation device</a>, <a href="https://publications.waset.org/abstracts/search?q=spring%20balancing" title=" spring balancing"> spring balancing</a>, <a href="https://publications.waset.org/abstracts/search?q=swimming%20pool%20lift" title=" swimming pool lift "> swimming pool lift </a> </p> <a href="https://publications.waset.org/abstracts/67372/approximate-spring-balancing-for-swimming-pool-lift-mechanism-to-reduce-actuator-torque" class="btn btn-primary btn-sm">Procedia</a> <a href="https://publications.waset.org/abstracts/67372.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">241</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">5400</span> Atmospheric Polycyclic Aromatic Hydrocarbons (PAHs) in Rural and Urban of Central Taiwan</h5> <div class="card-body"> <p class="card-text"><strong>Authors:</strong> <a href="https://publications.waset.org/abstracts/search?q=Shih%20Yu%20Pan">Shih Yu Pan</a>, <a href="https://publications.waset.org/abstracts/search?q=Pao%20Chen%20Hung"> Pao Chen Hung</a>, <a href="https://publications.waset.org/abstracts/search?q=Chuan%20Yao%20Lin"> Chuan Yao Lin</a>, <a href="https://publications.waset.org/abstracts/search?q=Charles%20C.-K.%20Chou"> Charles C.-K. Chou</a>, <a href="https://publications.waset.org/abstracts/search?q=Yu%20Chi%20Lin"> Yu Chi Lin</a>, <a href="https://publications.waset.org/abstracts/search?q=Kai%20Hsien%20Chi"> Kai Hsien Chi</a> </p> <p class="card-text"><strong>Abstract:</strong></p> This study analyzed 16 atmospheric PAHs species which were controlled by USEPA and IARC. To measure the concentration of PAHs, four rural sampling sites and two urban sampling sites were selected in Central Taiwan during spring and summer. In central Taiwan, the rural sampling stations were located in the downstream of Da-An River, Da-Jang River, Wu River and Chuo-shui River. On the other hand, the urban sampling sites were located in Taichung district and close to the roadside. Ambient air samples of both vapor phase and particle phase of PAHs compounds were collected using high volume sampling trains (Analitica). The sampling media were polyurethane foam (PUF) with XAD2 and quartz fiber filters. Diagnostic ratio, Principal component analysis (PCA), Positive Matrix Factorization (PMF) models were used to evaluate the apportionment of PAHs in the atmosphere and speculate the relative contribution of various emission sources. Because of the high temperature and low wind speed, high PAHs concentration in the atmosphere was observed. The total PAHs concentration, especially in vapor phase, had significant change during summer. During the sampling periods the total PAHs concentration of atmospheric at four rural and two urban sampling sites in spring and summer were 3.70±0.40 ng/m3,3.40±0.63 ng/m3,5.22±1.24 ng/m3,7.23±0.37 ng/m3,7.46±2.36 ng/m3,6.21±0.55 ng/m3　; 15.0± 0.14 ng/m3,18.8±8.05 ng/m3,20.2±8.58 ng/m3,16.1±3.75 ng/m3,29.8±10.4 ng/m3,35.3±11.8 ng/m3, respectively. In order to identify PAHs sources, we used diagnostic ratio to classify the emission sources. The potential sources were diesel combustion and gasoline combustion in spring and summer, respectively. According to the principal component analysis (PCA), the PC1 and PC2 had 23.8%, 20.4% variance and 21.3%, 17.1% variance in spring and summer, respectively. Especially high molecular weight PAHs (BaP, IND, BghiP, Flu, Phe, Flt, Pyr) were dominated in spring when low molecular weight PAHs (AcPy, Ant, Acp, Flu) because of the dominating high temperatures were dominated in the summer. Analysis by using PMF model found the sources of PAHs in spring were stationary sources (34%), vehicle emissions (24%), coal combustion (23%) and petrochemical fuel gas (19%), while in summer the emission sources were petrochemical fuel gas (34%), the natural environment of volatile organic compounds (29%), coal combustion (19%) and stationary sources (18%). <p class="card-text"><strong>Keywords:</strong> <a href="https://publications.waset.org/abstracts/search?q=PAHs" title="PAHs">PAHs</a>, <a href="https://publications.waset.org/abstracts/search?q=source%20identification" title=" source identification"> source identification</a>, <a href="https://publications.waset.org/abstracts/search?q=diagnostic%20ratio" title=" diagnostic ratio"> diagnostic ratio</a>, <a href="https://publications.waset.org/abstracts/search?q=principal%20component%20analysis" title=" principal component analysis"> principal component analysis</a>, <a href="https://publications.waset.org/abstracts/search?q=positive%20matrix%20factorization" title=" positive matrix factorization"> positive matrix factorization</a> </p> <a href="https://publications.waset.org/abstracts/43417/atmospheric-polycyclic-aromatic-hydrocarbons-pahs-in-rural-and-urban-of-central-taiwan" class="btn btn-primary btn-sm">Procedia</a> <a href="https://publications.waset.org/abstracts/43417.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">267</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">5399</span> Long Term Monitoring and Assessment of Atmospheric Aerosols in Indo-Gangetic Region of India</h5> <div class="card-body"> <p class="card-text"><strong>Authors:</strong> <a href="https://publications.waset.org/abstracts/search?q=Ningombam%20Linthoingambi%20Devi">Ningombam Linthoingambi Devi</a>, <a href="https://publications.waset.org/abstracts/search?q=Amrendra%20Kumar"> Amrendra Kumar</a> </p> <p class="card-text"><strong>Abstract:</strong></p> The long term sampling at one of the most populated city in Indo-Gangetic region shows higher mass concentration of atmospheric aerosol (PM₂.₅) during spring season (144.70µg/m³), summer season (91.96 µg/m³), the autumn season (266.48µg/m³) and winter season (367.09 µg/m³) respectively. The concentration of PM₂.₅ in Patna across the year shows much higher than the limit fixed by the national ambient air quality level fixed by central pollution control board India (CPCB, India) and World Health Organization (WHO). Different water-soluble cation (Na⁺, K⁺, Ca²⁺, NH₄⁺ , and Mg²⁺) and anion (Cl⁻, NO₃⁻ , and SO₄²⁻) species were detected in PM₂.₅. Results show the significantly higher loaded of water-soluble ions during winter and spring seasons. The acidity of the atmosphere was revealed and calculated using selected major cations (K⁺, Ca²⁺ , and NH₄⁺) and anions (SO₄²⁻, and NO₃⁻). A regression correlation was analyzed to check the significant linkage between the acidity and alkalinity ions. During the winter season (r² = 0.79) and spring season (r² = 0.64) shows good significant correlation between the cations and anions. The ratio of NO₃⁻/SO₄²⁻ indicates the sources of secondary pollutants were mainly influenced by industrial and vehicular emission however SO₄²⁻ mostly emitted from industries during the winter season. <p class="card-text"><strong>Keywords:</strong> <a href="https://publications.waset.org/abstracts/search?q=aerosols" title="aerosols">aerosols</a>, <a href="https://publications.waset.org/abstracts/search?q=inorganic%20species" title=" inorganic species"> inorganic species</a>, <a href="https://publications.waset.org/abstracts/search?q=source%20apportionment" title=" source apportionment"> source apportionment</a>, <a href="https://publications.waset.org/abstracts/search?q=Indo-Gangetic%20region" title=" Indo-Gangetic region"> Indo-Gangetic region</a> </p> <a href="https://publications.waset.org/abstracts/114594/long-term-monitoring-and-assessment-of-atmospheric-aerosols-in-indo-gangetic-region-of-india" class="btn btn-primary btn-sm">Procedia</a> <a href="https://publications.waset.org/abstracts/114594.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">132</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">5398</span> Development of Underactuated Robot Hand Using Cross Section Deformation Spring</h5> <div class="card-body"> <p class="card-text"><strong>Authors:</strong> <a href="https://publications.waset.org/abstracts/search?q=Naoki%20Saito">Naoki Saito</a>, <a href="https://publications.waset.org/abstracts/search?q=Daisuke%20Kon"> Daisuke Kon</a>, <a href="https://publications.waset.org/abstracts/search?q=Toshiyuki%20Sato"> Toshiyuki Sato</a> </p> <p class="card-text"><strong>Abstract:</strong></p> This paper describes an underactuated robot hand operated by low-power actuators. It can grasp objects of various shapes using easy operations. This hand is suitable for use as a lightweight prosthetic hand that can grasp various objects using few input channels. To realize operations using a low-power actuator, a cross section deformation spring is proposed. The design procedure of the underactuated robot finger is proposed to realize an adaptive grasping movement. The validity of this mechanism and design procedure are confirmed through an object grasping experiment. Results demonstrate the effectiveness of a cross section deformation spring in reducing the actuator power. Moreover, adaptive grasping movement is realized by an easy operation. <p class="card-text"><strong>Keywords:</strong> <a href="https://publications.waset.org/abstracts/search?q=robot%20hand" title="robot hand">robot hand</a>, <a href="https://publications.waset.org/abstracts/search?q=underactuated%20mechanism" title=" underactuated mechanism"> underactuated mechanism</a>, <a href="https://publications.waset.org/abstracts/search?q=cross-section%20deformation%20spring" title=" cross-section deformation spring"> cross-section deformation spring</a>, <a href="https://publications.waset.org/abstracts/search?q=prosthetic%20hand" title=" prosthetic hand"> prosthetic hand</a> </p> <a href="https://publications.waset.org/abstracts/1439/development-of-underactuated-robot-hand-using-cross-section-deformation-spring" class="btn btn-primary btn-sm">Procedia</a> <a href="https://publications.waset.org/abstracts/1439.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">372</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">5397</span> Groundwater Monitoring Using a Community: Science Approach</h5> <div class="card-body"> <p class="card-text"><strong>Authors:</strong> <a href="https://publications.waset.org/abstracts/search?q=Shobha%20Kumari%20Yadav">Shobha Kumari Yadav</a>, <a href="https://publications.waset.org/abstracts/search?q=Yubaraj%20Satyal"> Yubaraj Satyal</a>, <a href="https://publications.waset.org/abstracts/search?q=Ajaya%20Dixit"> Ajaya Dixit</a> </p> <p class="card-text"><strong>Abstract:</strong></p> In addressing groundwater depletion, it is important to develop evidence base so to be used in assessing the state of its degradation. Groundwater data is limited compared to meteorological data, which impedes the groundwater use and management plan. Monitoring of groundwater levels provides information base to assess the condition of aquifers, their responses to water extraction, land-use change, and climatic variability. It is important to maintain a network of spatially distributed, long-term monitoring wells to support groundwater management plan. Monitoring involving local community is a cost effective approach that generates real time data to effectively manage groundwater use. This paper presents the relationship between rainfall and spring flow, which are the main source of freshwater for drinking, household consumptions and agriculture in hills of Nepal. The supply and withdrawal of water from springs depends upon local hydrology and the meteorological characteristics- such as rainfall, evapotranspiration and interflow. The study offers evidence of the use of scientific method and community based initiative for managing groundwater and springshed. The approach presents a method to replicate similar initiative in other parts of the country for maintaining integrity of springs. <p class="card-text"><strong>Keywords:</strong> <a href="https://publications.waset.org/abstracts/search?q=citizen%20science" title="citizen science">citizen science</a>, <a href="https://publications.waset.org/abstracts/search?q=groundwater" title=" groundwater"> groundwater</a>, <a href="https://publications.waset.org/abstracts/search?q=water%20resource%20management" title=" water resource management"> water resource management</a>, <a href="https://publications.waset.org/abstracts/search?q=Nepal" title=" Nepal"> Nepal</a> </p> <a href="https://publications.waset.org/abstracts/45352/groundwater-monitoring-using-a-community-science-approach" class="btn btn-primary btn-sm">Procedia</a> <a href="https://publications.waset.org/abstracts/45352.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">203</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">5396</span> Ex (War) Machina: Arab Spring</h5> <div class="card-body"> <p class="card-text"><strong>Authors:</strong> <a href="https://publications.waset.org/abstracts/search?q=Deniz%20Alca">Deniz Alca</a> </p> <p class="card-text"><strong>Abstract:</strong></p> This research aims to study the themes of autonomy, democracy and the legitimacy of power under the headline of Arab Spring. After the first wave of Arab Spring, among the frequently mentioned ideals of self-recognition, awakening, democracy, autonomy, freedom etc. main concern of the border neighbors and the western governments was to see a “legitimate power.” Although the metaphor of spring was still pointing at emancipation, the principal focus was mostly not on the people but on the governments. So the question of what makes a government legitimate has come to the forefront. However, democracy and freedom, seems to be the main subject matters of the discussions, this rush about establishment of “legitimate governments” lead other countries, to indulge or worse endorse armed oppositionists. So essence of “power” changed from legitimate to rulership. It seems that the civil initiative or autonomy and clearly democracy are still far away from us. The need to a savior is overpowering. This cultural and traditional and almost hereditary miss orientation of the people, both the ones who are playing the role of god and the ones who believed the inevitable need to be freed by someone else, seems to be leading the Arabs to a new autocracy or worse. Middle East is waiting for the ex machina to operate. But what it gets is a spreading warfare. This darkness falling down on Middle East under the concept of spring may be explained by the confrontation of the concepts of emancipation and liberation. So the question is, if the era of emancipation really over or is there still a chance for autonomy and grassroots democracy operating as constituent power? <p class="card-text"><strong>Keywords:</strong> <a href="https://publications.waset.org/abstracts/search?q=autonomy" title="autonomy">autonomy</a>, <a href="https://publications.waset.org/abstracts/search?q=awakening" title=" awakening"> awakening</a>, <a href="https://publications.waset.org/abstracts/search?q=civil%20initiative" title=" civil initiative"> civil initiative</a>, <a href="https://publications.waset.org/abstracts/search?q=democracy" title=" democracy"> democracy</a>, <a href="https://publications.waset.org/abstracts/search?q=emancipation" title=" emancipation"> emancipation</a>, <a href="https://publications.waset.org/abstracts/search?q=legitimacy" title=" legitimacy"> legitimacy</a>, <a href="https://publications.waset.org/abstracts/search?q=liberation" title=" liberation"> liberation</a> </p> <a href="https://publications.waset.org/abstracts/30805/ex-war-machina-arab-spring" class="btn btn-primary btn-sm">Procedia</a> <a href="https://publications.waset.org/abstracts/30805.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">405</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">5395</span> The Arab Spring Rebellion or Revolution: An Analysis of the Text</h5> <div class="card-body"> <p class="card-text"><strong>Authors:</strong> <a href="https://publications.waset.org/abstracts/search?q=Sulaiman%20Ahmed">Sulaiman Ahmed</a> </p> <p class="card-text"><strong>Abstract:</strong></p> This paper will analyse the classical Islamic text in order to determine whether the Arab spring was a rebellion or a revolution. Commencing in 2010, we saw a series of revolutions or what some would call rebellions throughout the Arab peninsula. Many of the religious clergies came out emphatically in support of the people who wanted to overthrow the leaders. This brought forth the important question about the acceptability of rebelling against unjust leaders in Islamic theological texts. The paper will look to analyse the Islamic legal and theological position on the permissibility of rebelling, whether there is scholarly consensus on the issue, and how the texts are analysed in order to come to the current position we have today. The position of the clergy who supported the Arab spring will also be analysed in order to deduce if their position falls within the religious framework. An inquiry will be about to determine the ideology of those who joined the rebellion after the inception and whether these ideas can be found in classical Islamic texts. The nuances of these positions will be analysed in order to determine whether what we witnessed was a rebellion or a revolution. <p class="card-text"><strong>Keywords:</strong> <a href="https://publications.waset.org/abstracts/search?q=rebellion" title="rebellion">rebellion</a>, <a href="https://publications.waset.org/abstracts/search?q=revolution" title=" revolution"> revolution</a>, <a href="https://publications.waset.org/abstracts/search?q=Arab%20spring" title=" Arab spring"> Arab spring</a>, <a href="https://publications.waset.org/abstracts/search?q=scholarly%20consensus" title=" scholarly consensus"> scholarly consensus</a> </p> <a href="https://publications.waset.org/abstracts/98300/the-arab-spring-rebellion-or-revolution-an-analysis-of-the-text" class="btn btn-primary btn-sm">Procedia</a> <a href="https://publications.waset.org/abstracts/98300.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">154</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">5394</span> Uncertainty and Volatility in Middle East and North Africa Stock Market during the Arab Spring</h5> <div class="card-body"> <p class="card-text"><strong>Authors:</strong> <a href="https://publications.waset.org/abstracts/search?q=Ameen%20Alshugaa">Ameen Alshugaa</a>, <a href="https://publications.waset.org/abstracts/search?q=Abul%20Mansur%20Masih"> Abul Mansur Masih</a> </p> <p class="card-text"><strong>Abstract:</strong></p> This paper sheds light on the economic impacts of political uncertainty caused by the civil uprisings that swept the Arab World and have been collectively known as the Arab Spring. Measuring documented effects of political uncertainty on regional stock market indices, we examine the impact of the Arab Spring on the volatility of stock markets in eight countries in the Middle East and North Africa (MENA) region: Egypt, Lebanon, Jordon, United Arab Emirate, Qatar, Bahrain, Oman and Kuwait. This analysis also permits testing the existence of financial contagion among equity markets in the MENA region during the Arab Spring. To capture the time-varying and multi-horizon nature of the evidence of volatility and contagion in the eight MENA stock markets, we apply two robust methodologies on consecutive data from November 2008 to March 2014: MGARCH-DCC, Continuous Wavelet Transforms (CWT). Our results indicate two key findings. First, the discrepancies between volatile stock markets of countries directly impacted by the Arab Spring and countries that were not directly impacted indicate that international investors may still enjoy portfolio diversification and investment in MENA markets. Second, the lack of financial contagion during the Arab Spring suggests that there is little evidence of cointegration among MENA markets. Providing a general analysis of the economic situation and the investment climate in the MENA region during and after the Arab Spring, this study bear significant importance for policy makers, local and international investors, and market regulators. <p class="card-text"><strong>Keywords:</strong> <a href="https://publications.waset.org/abstracts/search?q=Portfolio%20Diversification" title="Portfolio Diversification ">Portfolio Diversification </a>, <a href="https://publications.waset.org/abstracts/search?q=MENA%20Region" title=" MENA Region "> MENA Region </a>, <a href="https://publications.waset.org/abstracts/search?q=Stock%20Market%20Indices" title=" Stock Market Indices"> Stock Market Indices</a>, <a href="https://publications.waset.org/abstracts/search?q=MGARCH-DCC" title=" MGARCH-DCC"> MGARCH-DCC</a>, <a href="https://publications.waset.org/abstracts/search?q=Wavelet%20Analysis" title=" Wavelet Analysis"> Wavelet Analysis</a>, <a href="https://publications.waset.org/abstracts/search?q=CWT" title=" CWT"> CWT</a> </p> <a href="https://publications.waset.org/abstracts/50777/uncertainty-and-volatility-in-middle-east-and-north-africa-stock-market-during-the-arab-spring" class="btn btn-primary btn-sm">Procedia</a> <a href="https://publications.waset.org/abstracts/50777.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">292</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">5393</span> Experimental Study on the Molecular Spring Isolator</h5> <div class="card-body"> <p class="card-text"><strong>Authors:</strong> <a href="https://publications.waset.org/abstracts/search?q=Muchun%20Yu">Muchun Yu</a>, <a href="https://publications.waset.org/abstracts/search?q=Xue%20Gao"> Xue Gao</a>, <a href="https://publications.waset.org/abstracts/search?q=Qian%20Chen"> Qian Chen</a> </p> <p class="card-text"><strong>Abstract:</strong></p> As a novel passive vibration isolation technology, molecular spring isolator (MSI) is investigated in this paper. An MSI consists of water and hydrophobic zeolites as working medium. Under periodic excitation, water molecules intrude into hydrophobic pores of zeolites when the pressure rises and water molecules extrude from hydrophobic pores when pressure drops. At the same time, energy is stored, released and dissipated. An MSI of piston-cylinder structure was designed in this work. Experiments were conducted to investigate the stiffness properties of MSI. The results show that MSI exhibits high-static-low dynamic (HSLD) stiffness. Furthermore, factors such as the quantity of zeolites, temperature, and ions in water are proved to have an influence on the stiffness properties of MSI. <p class="card-text"><strong>Keywords:</strong> <a href="https://publications.waset.org/abstracts/search?q=hydrophobic%20zeolites" title="hydrophobic zeolites">hydrophobic zeolites</a>, <a href="https://publications.waset.org/abstracts/search?q=molecular%20spring" title=" molecular spring"> molecular spring</a>, <a href="https://publications.waset.org/abstracts/search?q=stiffness" title=" stiffness"> stiffness</a>, <a href="https://publications.waset.org/abstracts/search?q=vibration%20isolation" title=" vibration isolation"> vibration isolation</a> </p> <a href="https://publications.waset.org/abstracts/29568/experimental-study-on-the-molecular-spring-isolator" class="btn btn-primary btn-sm">Procedia</a> <a href="https://publications.waset.org/abstracts/29568.pdf" target="_blank" class="btn btn-primary btn-sm">PDF</a> <span 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