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Articles 23851 - 23880 of 27383
Full-Text Articles in Engineering
Assessing Pedagogy In Bioengineering Classrooms: Quantifying Elements Of The “How People Learn” Model Using The Vanth Observation System (Vos), Monica F. Cox, David S. Cordray
Assessing Pedagogy In Bioengineering Classrooms: Quantifying Elements Of The “How People Learn” Model Using The Vanth Observation System (Vos), Monica F. Cox, David S. Cordray
School of Engineering Education Faculty Publications
One goal of the VaNTH Engineering Research Center is to estimate the effects of the “value added” to bioengineering student learning as a result of “How People Learn” (HPL) framework interventions. A necessary step in that process is to assess pedagogical differences in both lecture-based and HPL-oriented courses. Data from 28 bioengineering courses, over five semesters, were analyzed using a newly developed HPL Index. This index, developed from the Classroom Interaction Observation portion of the VaNTH Observation System, reports levels of HPL-inspired pedagogy, traditional pedagogy, and classroom organization within a class using codes for different types of faculty and student …
Determining The Repair Ranking Of Existing Rc Bridges Using Multi-Pole Fuzzy Pattern Recognition Evaluation Method, Ming-Te Liang, Ting- Bang Chu, Wen-Hu Tsao, Chi-Jang Yeh
Determining The Repair Ranking Of Existing Rc Bridges Using Multi-Pole Fuzzy Pattern Recognition Evaluation Method, Ming-Te Liang, Ting- Bang Chu, Wen-Hu Tsao, Chi-Jang Yeh
Journal of Marine Science and Technology–Taiwan
This paper proposes a technique for determining the repair ranking of existing reinforced concrete (RC) bridges using the multi-pole fuzzy pattern recognition evaluation method. The differences between bridges and grades are expressed by weighted generalized weight distance. To find the optimal relative membership degree of an evaluated bridge attributed to any grade, the operative principle is that the sum of the square of weighted generalized weight distance is minimum. Based on this principle, the problem of extreme value is established by the objective function in connection with constraint condition. Using the Lagrangean method, the multi-pole fuzzy pattern recognition evaluation method …
Web-Based Information Management System For The Long Term Ecological Research Program In Kenting, Taiwan, Yang-Chi Chang, Meng-Tsung Lee, Kun-Chi Lai
Web-Based Information Management System For The Long Term Ecological Research Program In Kenting, Taiwan, Yang-Chi Chang, Meng-Tsung Lee, Kun-Chi Lai
Journal of Marine Science and Technology–Taiwan
This paper introduces a web-based information management system which has been set up as a collaborative facility to allow key environmental and ecological information access for the Long Term Ecological Research (LTER) in Kenting, Taiwan. The coral reef ecosystem degradation in Kenting has concerned both public and private sectors, for which a LTER team was formed to investigate the problem. A multi-functional web-based system integrates diverse data collections and analyses efforts of team members during the project span. It also provides authorities with effective information and knowledge for sustainable coral reef management. Three information technologies, web Database Management System (DBMS), …
Dynamic Reynolds Equation For Micropolar Fluid Lubrication Of Porous Slider Bearings, Neminath Bhujappa Naduvinamani, Gudadappagouda Basanagouda Marali
Dynamic Reynolds Equation For Micropolar Fluid Lubrication Of Porous Slider Bearings, Neminath Bhujappa Naduvinamani, Gudadappagouda Basanagouda Marali
Journal of Marine Science and Technology–Taiwan
In this paper an attempt has been made to study the rheological effects of micropolar fluid lubricants on the steady state and dynamic behavior of porous slider bearings by considering the squeezing action. The general modified Reynolds-type equation of porous sliding-squeezing surfaces with micropolar fluids is derived for the assessment of dynamic characteristics of bearings with general film thickness. The detailed analysis is presented for the plane inclined porous slider bearings by using perturbation method. Two Reynolds-type equations corresponding to steady performance and perturbed characteristics are obtained. The closed form solution of these equations is obtained. The numerical computations of …
Developing A Convective Code With Vorticity Transport In Upwind Method, Je -Ee Ho
Developing A Convective Code With Vorticity Transport In Upwind Method, Je -Ee Ho
Journal of Marine Science and Technology–Taiwan
The Navier-Strokes equations are usually used to solve the convective problems, however, to satisfy the conversation of mass, the uncertainty of pressure terms will easily trigger off the numerical divergence during the iterative process; which results in a calculating failure and makes the numerical solutions impossible. In this study, a vorticity–transport method that avoids the involvement of pressure terms by cross differentiate the governing equations and meets the flow conservation with stream function was proposed. With the aid of the upwind scheme and implicit method, an effective transformation from the partial differential equations into the vortex potential algebraic equations would …
Multi-Objective Control Design For Stochastic Large-Scale Systems Based On Lmi Approach And Sliding Mode Control Concept, Koan-Yuh Chang, Wen-Jer Chang
Multi-Objective Control Design For Stochastic Large-Scale Systems Based On Lmi Approach And Sliding Mode Control Concept, Koan-Yuh Chang, Wen-Jer Chang
Journal of Marine Science and Technology–Taiwan
In this paper, a controller u (t) i is designed for stochastic large-scale systems to achieve the following three objectives simultaneously: the pole placement constraint, H∞ norm constraint and individual state variance constraint. In terms of the invariance property of sliding mode control, both the uncertain interconnection terms and an unknown nonlinear function will disappear on the sliding mode. Then, with the aid of upper bound covariance control theory, pole placement skill and H∞ norm control theory, a controller, in which the control feedback gain matrix Gi is synthesized using linear matrix inequality approach, is derived to achieve the above …
Effect Of Steel Fiber On The Mechanical Properties Of Cement-Based Composites Containing Silica Fume, Wei-Ting Lin, Ran Huang, Chin-Lai Lee, Hui-Mi Hsu
Effect Of Steel Fiber On The Mechanical Properties Of Cement-Based Composites Containing Silica Fume, Wei-Ting Lin, Ran Huang, Chin-Lai Lee, Hui-Mi Hsu
Journal of Marine Science and Technology–Taiwan
An experimental program was carried out to evaluate the mechanical properties of cement-based composites. Test variables included water to cementitious ratio, dosage of silica fume and volume fraction of steel fiber. Compressive strength test, direct tensile strength test, splitting tensile strength test, abrasion resistance test and drop weight test were performed and the results were analyzed statistically. According to the results of this study, the designed direct tensile testing method was a suitable method to estimate the tensile strength of fiber cement-based composites. Addition of fibers provided better performance for the cement-based composites, while silica fume in the composites would …
Characteristic Study Of Mhd Minipump, Je -Ee Ho
Characteristic Study Of Mhd Minipump, Je -Ee Ho
Journal of Marine Science and Technology–Taiwan
The present study aims to develop and discuss the availability of the Magneto Hydrodynamics Minipump (MHD) as a miniaturizative part specified for precise manufacturing or medical application. Based on the MHD theory, an available working current (1.8A) induced by lower voltage (0-12V) and weaker magnetic intensity (0.04T) meets the need in mini-system operation. However, precise estimations of working capacity, maximum head, dynamic head, and static head in various electrolyte concentrations are necessary. Furthermore, this work also provides a simplified analytic model with a static balance between Lorentz force, surface tension force, and body force. Compared with analytic solutions and experimental …
Mining Mining Data: Bringing Empirical Analysis To Bear On The Regulation Of Safety And Health In U.S. Mining, Alison D. Morantz
Mining Mining Data: Bringing Empirical Analysis To Bear On The Regulation Of Safety And Health In U.S. Mining, Alison D. Morantz
West Virginia Law Review
No abstract provided.
Workers At Risk: The Unfulfilled Promise Of The Occupational Safety And Health Act, Lynn Rhinehart
Workers At Risk: The Unfulfilled Promise Of The Occupational Safety And Health Act, Lynn Rhinehart
West Virginia Law Review
No abstract provided.
Integrating Technology To Improve Mine Safety In The Wake Of Recent Mine Disasters, Jeffery L. Kohler
Integrating Technology To Improve Mine Safety In The Wake Of Recent Mine Disasters, Jeffery L. Kohler
West Virginia Law Review
No abstract provided.
Free Markets, Individual Liberties And Safe Coal Mines: A Post-Sago Perspective, C. Gregory Ruffennach
Free Markets, Individual Liberties And Safe Coal Mines: A Post-Sago Perspective, C. Gregory Ruffennach
West Virginia Law Review
No abstract provided.
The Failed Promise Of Workplace Health Regulation, David C. Vladeck
The Failed Promise Of Workplace Health Regulation, David C. Vladeck
West Virginia Law Review
No abstract provided.
Dedication, Joyce E. Mcconnell
Approaching Coal Mine Safety From A Comparative Law And Interdisciplinary Perspective, Anne Marie Lofaso
Approaching Coal Mine Safety From A Comparative Law And Interdisciplinary Perspective, Anne Marie Lofaso
West Virginia Law Review
No abstract provided.
Let's Not Abandon What Works, Edward Chair
Let's Not Abandon What Works, Edward Chair
West Virginia Law Review
No abstract provided.
Electrocatalytic Performance Of Carbon Supported Au-Ir Catalyst As Cathodic Catalyst In Direct Formic Acid Fuel Cell, Wei Chen, Ya-Wen Tang, Tain-Hong Lu
Electrocatalytic Performance Of Carbon Supported Au-Ir Catalyst As Cathodic Catalyst In Direct Formic Acid Fuel Cell, Wei Chen, Ya-Wen Tang, Tain-Hong Lu
Journal of Electrochemistry
In this paper,it is reported for the first time that the electrocatalytic activities of the carbon supported Au(Au/C),carbon supported Ir(Ir/C) and the carbon supported Au-Ir(Au-Ir/C) catalysts prepared in the aqueous solution with tetrahydrofuran(THF) for the oxidation of formic acid and for the oxygen reduction were compared.It was found that all three catalysts showed no electrocatalytic activity for the oxidation of formic acid,but the electrocatalytic activity of the Au-Ir/C catalyst for oxygen reduction was much better than those of Au/C and Ir/C.Thus,the Au-Ir/C catalyst is suitable to be used as the cathodic catalyst in Direct formic acid fuel cell(DFAFC).
An Hap/Nanosilver Coating Prepared By Electrochemical Deposition And Its Antibacterial Characterization, Zhi-Wang Geng, Hui Wang, Chang-Jian Lin
An Hap/Nanosilver Coating Prepared By Electrochemical Deposition And Its Antibacterial Characterization, Zhi-Wang Geng, Hui Wang, Chang-Jian Lin
Journal of Electrochemistry
The silver nanoparticles were prepared by sodium citrate reduction of AgNO3.The nanoparticles were electrophoretic deposited on titanium, followed by the electrolytic deposition of hydroxyapatite(HAp). It is revealed, by the high-resolution transmission electron microscopy(HRTEM), that the diameters of nanosilver particles ranged from 5nm to 20nm. The XPS and XRD indicated the coating consisting of silver and HAp. According to the SEM images and antibacterial test, it is demonstrated that when the concentrations of the electrophoretic solution became higher more silver particles were depostited, and the antibacterial property improved. However, the particles aggregated on titanium greatly when the concentration exceeded …
Hydrolysis Of Sodium Borohydride By Ru-Ni Foam Catalyst, Jie Cheng, Feng Ye, Tong-Tao Wang, Jing-Jing Li, Yong-Liang Wang, Xin-Dong Wang
Hydrolysis Of Sodium Borohydride By Ru-Ni Foam Catalyst, Jie Cheng, Feng Ye, Tong-Tao Wang, Jing-Jing Li, Yong-Liang Wang, Xin-Dong Wang
Journal of Electrochemistry
This paper presented a method of hydrogen generation from sodium borohydride solution for fuel cells.The Ru-Ni foam catalyst which was prepared by chemical plating showed strong activity and stability.The pretreatment of Ni foam before chemical plating was very important for the catalyst's strong activity and stability.This easy-to-prepared catalyst exhibited a good activity after being used several times.The effects of NaBH4 concentration,temperature and used times on the hydrogen generation rate were investigated.The results showed that the rate was remarkablely increased with the temperature rising and the rate increased more than ten times when the temperature of reaction rised from 15 …
Preparation And Supercapacitive Properties Of Co(Oh)2/Nay Composite, Chi Ma, Ling-Bin Kong, Yong-Chun Luo, Long Kang
Preparation And Supercapacitive Properties Of Co(Oh)2/Nay Composite, Chi Ma, Ling-Bin Kong, Yong-Chun Luo, Long Kang
Journal of Electrochemistry
The Co(OH)2/NaY composite was prepared by chemical precipitation method and then tested as an active electrode material for an electrochemical supercapacitor.The results indicated that the composite displayed superior capacitive performance.The maximum specific capacitance of Co(OH)2 was 632.5 F/g.The structure and electrochemical properties of the composite were also discussed.
Corrosion Inhibition Of Self-Assembled Films On Iron By Electrochemical Impedance Spectroscopy, Yuan-Yuan Feng, Shen-Hao Chen, Juan-Juan Zhou, Wen-Juan Guo
Corrosion Inhibition Of Self-Assembled Films On Iron By Electrochemical Impedance Spectroscopy, Yuan-Yuan Feng, Shen-Hao Chen, Juan-Juan Zhou, Wen-Juan Guo
Journal of Electrochemistry
The self-assembled films of tetradecylamine were formed on iron surface, and the inhibition ability of which for iron corrosion in 0.5 mol/L H2SO4 solutions was studied by electrochemical impedance spectroscopy technique. Results indicated that longer immersion time would result in stronger inhibition ability of the films. The maximal inhibition efficiency(IE) of the tetradecylamine films was 68.7%. When the tetradecylamine films were modified by dodecylthiol, the mixed films became denser and more stable, thus the inhibition ability increased remarkably. The η of the mixed films increased to 78.2%.
Electrochemical Synthesis, Characterization And Fluorescence Property Of Nano Na2Sif6, Guo-Xu Qin, Xin-Jun Wan, Xi-Mei Yuan, Dao-Bao Chu
Electrochemical Synthesis, Characterization And Fluorescence Property Of Nano Na2Sif6, Guo-Xu Qin, Xin-Jun Wan, Xi-Mei Yuan, Dao-Bao Chu
Journal of Electrochemistry
The nano TiO2 film was prepared by sol-gel process and characterized with X-ray diffraction(XRD) and scanning electron microscope(SEM).It was found that the average size of pore diameter was about 80 nm for the nano TiO2 film.The Nano Na2SiF6 was synthesized by electrochemical deposition on the nanoporous film electrode and characterized with XRD and transmission electron microscope(TEM).The result showed that the average size of nanoparticle was 20 nm for the nano Na2SiF6.The fluorescence property of nano Na2SiF6 was also studied briefly.The result indicated that the nano Na2SiF …
Electricity Generation In Microbial Fuel Cells Catalyzed By Mixed Culture And Pure Culture, Chen-Dong Shuang, En-Ren Zhang, Guo-Wang Diao, Fang-Fang Fan, Jie Yuan
Electricity Generation In Microbial Fuel Cells Catalyzed By Mixed Culture And Pure Culture, Chen-Dong Shuang, En-Ren Zhang, Guo-Wang Diao, Fang-Fang Fan, Jie Yuan
Journal of Electrochemistry
Microbial fuel cells(MFCs) were constructed by inoculating fresh sedimentary microorganisms.Effect of phenol on performance of MFCs was investigated.The results showed that the generation of electrical current was induced by bacteria attached on the surface of the anode.Presence of phenol reduced the rate of glucose consumption and extended the duration of electricity generation with the same addition of glucose.In addition,the electricity generation by a single strain(belonging to pseudomonas species) separated from the sedimentary MFC was also investigated.The experimental results indicated that the presence of metabolic intermediates which exhibited electrochemical activity was necessary for the electricity production.Analysis of GC-MS showed that the …
Preliminary Study Of Single Flow Zinc-Nickel Battery, Li Zhang, Jie Cheng, Yu-Sheng Yang, Yue-Hua Wen, Xin-Dong Wang, Zi-Li Xie
Preliminary Study Of Single Flow Zinc-Nickel Battery, Li Zhang, Jie Cheng, Yu-Sheng Yang, Yue-Hua Wen, Xin-Dong Wang, Zi-Li Xie
Journal of Electrochemistry
The micromorphology of zinc electrodeposited at different currents in the flowing electrolyte was studied.It has been shown that the structure of the zinc became compacted with the increase of the charge current density and no zinc dendrite was presenct.A cell with 2Ah capacity was assembled and the charge-discharge test was performed.The results showed that the average charge voltage was 1.84V and the average discharge voltage was 1.65V.The high efficiencies can be achieved with an average coulombic efficiency of 97% and energy efficiency of 86% over 1000 cycles.
Electrochemical Reductive Behaviors Of 3,4,5,6-Tetrachloro-2-Trichloromethylpyridine At Ag Electrode, Chun-An Ma, Yi-Jiao Hu, Ying-Hua Xu
Electrochemical Reductive Behaviors Of 3,4,5,6-Tetrachloro-2-Trichloromethylpyridine At Ag Electrode, Chun-An Ma, Yi-Jiao Hu, Ying-Hua Xu
Journal of Electrochemistry
The electrochemical reductive behavior of 3,4,5,6-tetrachloro-2-trichloropyridine(heptachloropyridine) on silver electrode in the mixture of acetonitrile and water solutions containing TBAP was investigated by cyclic voltammetry.The influences of scan rate,concentration and temperature on the electrochemical behavior were discussed.It was shown that the reduction of heptachloropyridine on the silver electrode was a diffusion-controlled irreversible process.The diffusion coefficient of heptachloropyridine in the acetonitrile solution was 3.0×10-5 cm2/s.The mechanism of the dechloration of 3,4,5,6-tetrachloro-2-trichloropyridine was also discussed.
Direct Electrochemistry Of Hemoglobin On The Electrode Modified With Ddab And Swcnt, Wen-Jing Hou, Lin Zhou, Xia-Qin Wu, Hong-Xia Zhang, Wen Xie, Liu Yang, Zhong-Qing Lu
Direct Electrochemistry Of Hemoglobin On The Electrode Modified With Ddab And Swcnt, Wen-Jing Hou, Lin Zhou, Xia-Qin Wu, Hong-Xia Zhang, Wen Xie, Liu Yang, Zhong-Qing Lu
Journal of Electrochemistry
Hemoglobin(Hb) was immobilized onto the surface of glassy carbon electrode with the single-wall carbon nanotubes and surfactant didodecyldimethylamonium bromide(DDAB) modified previously and its electrochemical behaviors have been investigated by cyclic voltammetry.A pair of well-defined redox peaks has been obtained.Cyclic voltammetry and electrochemical impedance spectroscopy(EIS) were also used to study on the effect of different concentration of SWCNT in DDAB.The result shows that the 1 mg/mL is the best choice.The dependence of E0' on solution pH with the slope of 39 mV/pH,indicated that redox of the Hb is a one electron reaction with two protons transfer.The results also showed …
The Effect Of Ru: Sn On Properties Of Ru-Ir-Sn Oxide Anode Coatings, Lei Ji, Jun-Tao Wang, Wen-Bin Liu, Li-Kun Xu, Gui-Lin Xue
The Effect Of Ru: Sn On Properties Of Ru-Ir-Sn Oxide Anode Coatings, Lei Ji, Jun-Tao Wang, Wen-Bin Liu, Li-Kun Xu, Gui-Lin Xue
Journal of Electrochemistry
The anode coatings of Ru-Ir-Sn oxide with different Ru/Sn ratios were prepared by sol-gel method.The influences of Ru/Sn ratio on properties of anode coatings were studied by scanning electron microscope(SEM),energy dispersive X-ray detector(EDX),X-ray diffraction(XRD).The potential of chlorine evolution,current efficiency,accelerated life,cyclic vohammetry and electrochemical impedance spectroscopy(EIS) tests were carried out.The results showed that there was an obvious effect of Ru/Sn ratio on the morphology of the coatings.The cyclic voltammogram,double layer capacitances and accelerated life of anode coatings had a tendency to fall down firstly then increased as the Ru% increased,the current effency and potential of chlorine evolution had a tendency to …
Design And Fabrication Of The High Efficient Platinum-Nanoporous Gold Catalysts, Zhao-Na Liu, Jin-Tao Zhang, Fang Tian, Peng-Peng Liu, Hou-Yi Ma, Yi Ding
Design And Fabrication Of The High Efficient Platinum-Nanoporous Gold Catalysts, Zhao-Na Liu, Jin-Tao Zhang, Fang Tian, Peng-Peng Liu, Hou-Yi Ma, Yi Ding
Journal of Electrochemistry
The nanoporous gold(NPG) electrodes with uniform pore sizes and ligaments were prepared by using a simple dealloying method.The as-prepared NPG showed high catalytic activity towards the oxidation of formic acid and formaldehyde.After tiny amount of platinum was deposited onto the NPG substrate,not only the structure stability of NPG was greatly improved,but also the Pt-Au bimetallic catalysts displayed the better catalytic activity and the stronger poison resistance towards the electrooxidation of small organic molecules than the bulk platinum due to synergistic effect between Au and Pt compositions.