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2011

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Full-Text Articles in Engineering

Adaptive Mitigation In The Electric Power Sector, Lesley K. Mcallister Dec 2011

Adaptive Mitigation In The Electric Power Sector, Lesley K. Mcallister

BYU Law Review

No abstract provided.

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Smart Growth In Dumb Places: Sustainability, Disaster, And The Future Of The American City, Lisa Grow Sun Dec 2011

Smart Growth In Dumb Places: Sustainability, Disaster, And The Future Of The American City, Lisa Grow Sun

BYU Law Review

One of the many lessons of the recent earthquake and tsunami in Japan is that we cannot mitigate disaster risk through building codes and other structural solutions alone. Location is key to a community’s natural hazard vulnerability. Consequently, the most far-reaching and important question for disaster mitigation today is where we will channel the growth that will be needed to accommodate our expanding population. Yet, both environmental scholars and policymakers are promoting sustainability initiatives that will channel our country’s future growth into existing urban areas that are already extremely vulnerable to disaster. Indeed, many of these policies - and the …

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Adapting To Climate Change While Planning For Disaster: Footholds, Rope Lines, And The Iowa Floods, Robert R.M. Verchick, Abby Hall Dec 2011

Adapting To Climate Change While Planning For Disaster: Footholds, Rope Lines, And The Iowa Floods, Robert R.M. Verchick, Abby Hall

BYU Law Review

No abstract provided.

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The Method Of Fundemental Solutions For The Multi-Dimensional Wave Equations, Meng-Huang Gu, Chia-Ming Fan, Der-Liang Young Dec 2011

The Method Of Fundemental Solutions For The Multi-Dimensional Wave Equations, Meng-Huang Gu, Chia-Ming Fan, Der-Liang Young

Journal of Marine Science and Technology

In this paper, a meshless method is developed for solving multi-dimensional wave equations. The proposed method is based on the method of particular solution (MPS), the method of fundamental solutions (MFS) and the Houbolt finite difference (FD) method. The wave equation is considered as a Poisson-type equation with the time-dependent source term. The Houbolt method is applied to avoid the difficult problems for dealing with the initial conditions in forming the linear algebra system. The works of space discretization are dependent on the method of particular solution and the method of fundamental solutions. There are three numerical examples considered in …

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Numerical Modeling Of A Dual Pontoon Floating Structure With A Liquid Container, Chai-Cheng Huang, Chih-Ting Feng, Hung-Jie Tang Dec 2011

Numerical Modeling Of A Dual Pontoon Floating Structure With A Liquid Container, Chai-Cheng Huang, Chih-Ting Feng, Hung-Jie Tang

Journal of Marine Science and Technology

A numerical model is developed to investigate the waveinduced dynamic properties of a dual pontoon floating structure (DPFS) with a liquid container on the top. This model has to deal with two kinds of fluid domain: one is the incident wave domain, while the other is the excited fluid domain in a sloshing container. The boundary integral equation method (BIEM) with linear element scheme is applied to forming a 2D fully nonlinear numerical wave tank (NWT). The secondorder Stokes wave theory is adopted to give the velocity on the input boundary. The velocity potential and acceleration potential are solved simultaneously …

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Development Of Early Warning Modeling System For Sudden Chemical Spill In Plain River Network, Hai-Long Yin, Zu-Xin Xu, Chen Wang, Da Yu Dec 2011

Development Of Early Warning Modeling System For Sudden Chemical Spill In Plain River Network, Hai-Long Yin, Zu-Xin Xu, Chen Wang, Da Yu

Journal of Marine Science and Technology

An early warning modeling system for assessing potential river water quality threat from sudden chemical discharge incidents was developed, based on a hydrodynamic model for tidal plain river network equipped with sluice gates and water quality models. For the hydrodynamic model, the mode to simulate river flow under artificial irreversible gate operation was presented, so that the flow related to gate control with tidal occurrence could be simulated, which was calibrated by the measured data. For the water quality models, three kinds of models including oil spill model, hydrophobic model and hydrophilic model were developed based on chemical properties. With …

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Influences Of Discharge Reductions On Salt Water Intrusion And Residual Circulation In Danshuei River, Wen-Cheng Liu, Wei-Bo Chen, Ming-Hsi Hsu Dec 2011

Influences Of Discharge Reductions On Salt Water Intrusion And Residual Circulation In Danshuei River, Wen-Cheng Liu, Wei-Bo Chen, Ming-Hsi Hsu

Journal of Marine Science and Technology

A three-dimensional, unstructured grid, hydrodynamic model was established and applied to study the salt water intrusion and residual circulation in the Danshuei River estuarine system of northern Taiwan. The construction of two reservoirs (i.e. Shihmen Reservoir and Feitsui Reservoir) and water diversion in the upper reaches of the river system significantly reduces the freshwater inflow. The changes had contributed farther to the intrusion of tidal flow and salt water in the upstream direction. The model was validated with available hydrographic data measured in 2001 then used to probe the change in salt water intrusion as a result of reservoir construction. …

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Streamwise Dynamics Controlled Jet Spreading, Mixing And Physical Source Of The Vortices, Amalendu Sau, Robert R. Hwang Dec 2011

Streamwise Dynamics Controlled Jet Spreading, Mixing And Physical Source Of The Vortices, Amalendu Sau, Robert R. Hwang

Journal of Marine Science and Technology

Within the framework of the present investigation we perform Direct Numerical Simulations to study the role of streamwise dynamics in the jet spreading and mixing, and provide a clear understanding about the source of these important vortices in two-step rectangular sudden expansion flows. The present setup is designed to generate higher mass entrainment, and the system generated passive forcing provided the necessary impetus for the sustained growth/evolution of the streamwise vertices, which played the key role in the mixing enhancement. On the other hand, by suitably placing two tiny rectangular ‘tabs’ on the inlet channel walls, the nature of growth …

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A 2d Chaos-Based Visual Encryption Scheme For Clinical Eeg Signals, Chin-Feng Lin, Boa-Shun Wang Dec 2011

A 2d Chaos-Based Visual Encryption Scheme For Clinical Eeg Signals, Chin-Feng Lin, Boa-Shun Wang

Journal of Marine Science and Technology

In this paper, we have developed a two-dimensional (2D) chaos-based encryption scheme that can be applied to signals with transmission bit errors in clinical electroencephalography (EEG) and mobile telemedicine. As opposed to one-dimensional (1D) chaos-based encryption, the proposed 2D schemes uses the concept of parallel processing to increase the encryption speed. An essential feature of the proposed scheme is that signals mapping of a 2D chaotic scrambler and a permutation scheme are used to obtain clinical EEG information that requires high-level encryption. Simulation results show that when the correct deciphering parameters are inputted, EEG signals with a transmission bit error …

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Effect Of Transverse Surface Roughness On The Performance Of Hydromagnetic Squeeze Film Between Conducting Truncated Conical Plates, Pragna Amratlal Vadher, Gunamani Deheri, Rakesh Manilal Patel Dec 2011

Effect Of Transverse Surface Roughness On The Performance Of Hydromagnetic Squeeze Film Between Conducting Truncated Conical Plates, Pragna Amratlal Vadher, Gunamani Deheri, Rakesh Manilal Patel

Journal of Marine Science and Technology

An attempt has been made to study and analyze the behavior of a hydromagnetic squeeze film between conducting porous transversely rough truncated conical plates. The associated Reynolds' equation is solved with appropriate boundary conditions to investigate the behavior of performance characteristics. The results indicate that the performance of the bearing system gets enhanced vis-à-vis a bearing system working with a conventional lubricant. This article reveals that the negative effect induced by porosity and standard deviation can be overcome completely by the positive effect of the magnetization parameter and conductivities by choosing suitable aspect ratio and the semi-vertical angle in the …

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Design Of A Two-Stage Electromagnetic Impulse Force Circuit For Gene Gun, Pei-Hwa Huang, Ping-Yin Chen Dec 2011

Design Of A Two-Stage Electromagnetic Impulse Force Circuit For Gene Gun, Pei-Hwa Huang, Ping-Yin Chen

Journal of Marine Science and Technology

The main objective of this paper is to present a design of the power source for gene gun based on the principle of electromagnetic mechanism. The energy stored in capacitors will be discharged toward the electromagnetic device of gene gun for providing micro-projectiles with electromagnetic force to generate the desired impact force, and a specific electronic circuit is to be designed to achieve the coupling between the electromagnetic device and the energy storage capacitor. A gene gun is to be implemented for a testing purpose. In order to reduce the size and the cost of the gene gun, a two-stage …

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A New Species Of Rhinogobius Gill, 1859 (Teleostei: Gobiidae) From The Bonin Islands, Japan, Toshiyuki Suzuki, I-Shiung Chen, Hiroshi Senou Dec 2011

A New Species Of Rhinogobius Gill, 1859 (Teleostei: Gobiidae) From The Bonin Islands, Japan, Toshiyuki Suzuki, I-Shiung Chen, Hiroshi Senou

Journal of Marine Science and Technology

A new freshwater goby, Rhinogobius ogasawaraensis was collected from streams of the Bonin Islands (Ogasawara Group), Japan. The species can be distinguished from all congeneric species by the following combination of characters: (1) meristic features: second dorsal fin rays I, 8-9; pectoral fin rays 18-20; predorsal scales 7-16; longitudinal scale rows usually 32-34; vertebral count 26; and (2) specific colouration: check with some red spots, nape with several longitudinal dark stripes, upper part of pectoral fin base with a horizontal deep brown bar, intermittent dark dotted rows along middle axis of body, no saddle shaped patch of dark dots on …

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Harmonic Decomposition By Hht On Regular Waves Propagating Over A Rectangular Submerged Obstacle Upon A Fluidized Bed, Yung-Lung Chen, Shiaw-Yih Tzang, Shan-Hwei Ou Dec 2011

Harmonic Decomposition By Hht On Regular Waves Propagating Over A Rectangular Submerged Obstacle Upon A Fluidized Bed, Yung-Lung Chen, Shiaw-Yih Tzang, Shan-Hwei Ou

Journal of Marine Science and Technology

The experimental measurements of surface waves over a submerged rectangular obstacle upon a sandy bed reported by Tzang et al. (2008) have further been analyzed in detail by Hilbert-Huang transform (HHT). The harmonic components of regular waves at 5 sites in the vicinity of the obstacle are decomposed into the intrinsic mode functions (IMFs) by the ensemble empirical mode decomposition (EEMD) with postprocessing scheme using masking signal EMD (MSEMD). The results of Hilbert spectrum of waves derived by the HHT illustrate that considerable decay of harmonic amplitude occurs at all 5 sites when the sandy bed have been fluidized but …

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Improved Technique For Controlling Oscillation Of Coastal Morphological Modeling System, Yun-Chih Chiang, Sung-Shan Hsiao, Ming-Chung Lin Dec 2011

Improved Technique For Controlling Oscillation Of Coastal Morphological Modeling System, Yun-Chih Chiang, Sung-Shan Hsiao, Ming-Chung Lin

Journal of Marine Science and Technology

Numerical modeling of coastal morphological evolution is a powerful tool for the planning and design of coastal engineering. The coastal morphological modeling system is based on the sediment conservation law, which couples modules for waves, wave-driven currents, and sediment transport rates. The numerical scheme for the sediment conservation law and nonlinear coupling between these modules can lead to dispersions, diffusions, spurious oscillations and instability problems that are still not well established. Filtering or artificial diffusion are often added to achieve stability. In this paper, several controlling oscillations schemes without filters are described. A stable morphological model is introduced with a …

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Dynamic Coupling Of Multi-Phase Fluids With A Moving Obstacle, Tso-Ren Wu, Chih-Jung Huang, Mei-Hui Chuang, Chung-Yue Wang, Chia-Ren Chu Dec 2011

Dynamic Coupling Of Multi-Phase Fluids With A Moving Obstacle, Tso-Ren Wu, Chih-Jung Huang, Mei-Hui Chuang, Chung-Yue Wang, Chia-Ren Chu

Journal of Marine Science and Technology

In this paper, we present a two-way coupled moving solid algorithm with discrete element method (DEM) to simulate dynamic fluid-solid interaction. This model allows obstacles moving in the multi-phase fluids to generate realistic motion for both the fluids and obstacles. We discretize the NavierStokes equation using finite volume method (FVM) for the fluid part. The volume-of-fluid (VOF) method is used to track the fluid-fluid and fluid-solid interfaces. This algorithm is useful in the fields of Engineering and Earth Sciences, such as structure collapse and landslide generated tsunamis. Examples of landslide tsunami and floating cubes are demonstrated using the algorithm.

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Sensitivity Analysis Of Time/Depth Dependent Chloride Diffusion Coefficient In Concrete, Yung-Ming Sun, Ta-Peng Chang, Ming-Te Liang Dec 2011

Sensitivity Analysis Of Time/Depth Dependent Chloride Diffusion Coefficient In Concrete, Yung-Ming Sun, Ta-Peng Chang, Ming-Te Liang

Journal of Marine Science and Technology

This paper presents the results for a sensitivity analysis of the time/depth dependent chloride diffusion model in concrete using differential analysis techniques. Four governing prameters of the model are taken to determine the sensitivity of the chloride diffusion coefficient: the time of exposure, inspecting depth, surface chloride concentration, and chloride concetration at the inspecting point. The results of this sensitivity analysis are discussed in detail, including variations in the diffusion coefficient according to the four parameters and the implications for durability design of concrete structures.

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Evaluation Of The Recovery Time Of Sea Bass (Dicentrarchus Labrax Linnaeus, 1758) Juveniles From Transport And Handling Stress: Using Ammonia Nitrogen Excretion Rates As A Stress Indicator, Betül Kayali, Murat Yigit, Musa Bulut Dec 2011

Evaluation Of The Recovery Time Of Sea Bass (Dicentrarchus Labrax Linnaeus, 1758) Juveniles From Transport And Handling Stress: Using Ammonia Nitrogen Excretion Rates As A Stress Indicator, Betül Kayali, Murat Yigit, Musa Bulut

Journal of Marine Science and Technology

A time-course study was conducted in order to evaluate the recovery time of juvenile Sea bass (Dicentrarchus labrax) from transport and handling stress. Among metabolite indices, ammonia nitrogen excretion rates were used as stress indicator. The measurements were carried out in water ambience of 13 ± 1ºC under natural light conditions (16L/8D photoperiod). Juveniles were transported for about 2 hours in a fish transport tank with oxygen supply. Handling stress was due to netting at the outlet site during stocking fish into the transport tank and netting at the experimental facility while transferring fish from transport tank into experimental tanks. …

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Minerva 2011, The Honors College Dec 2011

Minerva 2011, The Honors College

Minerva

This issue of Minerva includes an article on four newly-hired Honors preceptors, Rob Glover, Sarah Harlan-Haughey, Jordan LaBouff, and Justin Martin; a feature on Honors award, scholarship, and fellowship winners; and an article on the Honors College collaboration with the IDeA Network of Biomedical Research Infrastructure (INBRE) National Genomics Research Initiative.

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Ole Miss Engineer 2011-2012 Dec 2011

Ole Miss Engineer 2011-2012

Ole Miss Engineer

No abstract provided.

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Recovery Of Zinc From The Spent Zinc-Carbon Dry Cell Batteries Through Pyrometallurgical Route, M Haque Khan, Asw Kurny Dec 2011

Recovery Of Zinc From The Spent Zinc-Carbon Dry Cell Batteries Through Pyrometallurgical Route, M Haque Khan, Asw Kurny

Journal of Metals, Materials and Minerals

Spent zinc-carbon batteries of all the five types (AAA, AA, C, D and 9V) were processed to recover zinc metal. All the components of the battery were separated, chemically analyzed and the anodic zinc parts were subjected to pyrometallurgical processing. Extraction of zinc was negligible when no fluxing agent was used. However, extent of recovery increased significantly when chloride salts: sodium chloride, calcium chloride and ammonium chloride were used as a fluxing agent. Among these, ammonium chloride gave the best result as flux. Using 10 %wt. of each flux, extraction of zinc was 90% for ammonium chloride, and around 75% …

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4-(N,N-Diethylamino)Benzaldehyde Thiosemicarbazone As Corrosion Inhibitor For 6061 Al - 15 Vol. Pct. Sic(P) Composite And Its Base Alloy, G M. Pinto, J Nayak, A N. Shetty Dec 2011

4-(N,N-Diethylamino)Benzaldehyde Thiosemicarbazone As Corrosion Inhibitor For 6061 Al - 15 Vol. Pct. Sic(P) Composite And Its Base Alloy, G M. Pinto, J Nayak, A N. Shetty

Journal of Metals, Materials and Minerals

The inhibitive action of 4-(N,N-diethylamino)benzaldehyde thiosemicarbazone (DEABT) on the corrosion behavior of 6061 Al -15 vol. pct. SiC(p) composite and its base alloy was studied at different temperatures in sulfuric acid medium containing varying concentrations of it, using Tafel extrapolation and AC impedance spectroscopy (EIS) techniques. Results showed that DEABT was an effective inhibitor, showing inhibition efficiency of 80 % in 0.5 M sulfuric acid. The adsorption of DEABT on both the composite and the base alloy was found to be through physisorption obeying Langmuirs adsorption isotherm.The thermodynamic parameters such as free energy of adsorption and activation parameters were calculated.

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Effect Of Vanadium On Subcritical Heat Treatment Behavior Of Hypoeutectic 16 Wt% Cr Cast Iron Containing 2 Wt% Mo, R Junsamoot, S Inthidech, K Sriprateep, P Sricharoenchai, Y Matsubara Dec 2011

Effect Of Vanadium On Subcritical Heat Treatment Behavior Of Hypoeutectic 16 Wt% Cr Cast Iron Containing 2 Wt% Mo, R Junsamoot, S Inthidech, K Sriprateep, P Sricharoenchai, Y Matsubara

Journal of Metals, Materials and Minerals

Subcritical heat treatment of austenite in alloyed cast iron by tempering at the temperature below pearlite transformation (A1), has been used to improve matrix hardness without hardening. Hypoeutectic high chromium cast irons containing 16 wt% Cr - 2 wt% Mo without and with V were prepared in order to clarify the effect of holding temperature and holding time on behavior of hardness and decomposition fraction of austenite in matrix (f) in subcritical heat treatment. As-cast specimens were held at temperature from 723 K to 923 K for 14.4 - 43.2 ks, and then cooled by fan air. In the as-cast …

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Highly Porous Silica Network Prepared From Sodium Metasilicate, R E. Essien, O A. Olaniyi, L A. Adams, R O. Shaibu Dec 2011

Highly Porous Silica Network Prepared From Sodium Metasilicate, R E. Essien, O A. Olaniyi, L A. Adams, R O. Shaibu

Journal of Metals, Materials and Minerals

Porous silica network was prepared from sodium metasilicate (Na2SiO3) at room temperature (27C) using hydrochloric acid (HCl) as catalyst through the sol-gel method. The gel was dried at 120C for 1 day and calcined at 800C for 3 hours and the material obtained characterized using scanning electron microscopy (SEM), X-ray diffraction (XRD) and Fourier transform infrared spectroscopy (FTIR). The results showed the formation of amorphous silica particles of average sizes 598 nm with ordered porous network of pore sizes ranging from 0.18-0.91 ?m. This synthetic route uses sodium metasilicate as commercial precursor without pore forming templates which could be useful …

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Ni Electroless Plating Of Abs Polymer By Palladium And Tin-Free Process, P Dechasit, W Trakarnpruk Dec 2011

Ni Electroless Plating Of Abs Polymer By Palladium And Tin-Free Process, P Dechasit, W Trakarnpruk

Journal of Metals, Materials and Minerals

A palladium and tin-free process for the Ni electroless plating of acrylonitrile-butadiene-styrene (ABS) polymer has been developed. The ABS was first etched then activated with Ni (or Co) ions. Ni or Co adsorbed was quantified by atomic absorption spectroscopy. Sodium borohydride solution was found to be effective in reduction of Ni (or Co) ions. By immersing in a Ni plating bath the Co (or Ni) can then auto-catalytically deposit a Ni film on the ABS. The amount and thickness of Ni film determined by SEM-EDX were the highest when using 3 g/L of nickel acetate solution, 0.5 M sodium borohydride …

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Preparation Of Copper Lead Frame By Powder Metallurgy Technique, P Y. Chew, A H. You, T R. Vijayaram, B K. See, P S. Lim, M C. Ng Dec 2011

Preparation Of Copper Lead Frame By Powder Metallurgy Technique, P Y. Chew, A H. You, T R. Vijayaram, B K. See, P S. Lim, M C. Ng

Journal of Metals, Materials and Minerals

Pure Cu is prepared with the dimension of 17.7 mm in diameter and 10 - 15 mm in height using powder metallurgical method to characterize its electrical and mechanical properties. These samples are compacted at a constant pressure of 280 MPa. Pure Cu pellets are sintered at 600C and 950C for 3, 4 and 7 hours. Before sintering, pure Cu pellet is subjected to SEM in order to check the compactness of the pellet, and also the grain structure of the Cu. All the pellets with different temperatures are re-weighed and sintered density are calculated after sintering. Besides that, porosity …

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Mechanical Properties Of Stir-Mixed Sicp-Reinforced Aluminium Composites, R Buntan, D Phuenchomphu, P Sukmoung, K Doomao, O Anunapiwat, T Patcharawit Dec 2011

Mechanical Properties Of Stir-Mixed Sicp-Reinforced Aluminium Composites, R Buntan, D Phuenchomphu, P Sukmoung, K Doomao, O Anunapiwat, T Patcharawit

Journal of Metals, Materials and Minerals

Aluminium composites have found their strength in engineering applications such as automotive, electrical and light-weight applications. To achieve uniform microstructure and good mechanical properties, the fabrication techniques are prime factors in controlling wettability and porosity problems. This research therefore aimed for studying microstructure-mechanical property relation of SiCp-reinforced 356 aluminium composites fabricated by a cost-effective stir casting process, to which three elemental additions, Al-5Ti-B, Sr, and Mg,were investigated. Furthermore, effects of SiCp additions (0-15 wt.%) and T6 heat treatment (530C/12h + 155C/4 h) on mechanical properties of the composites were also studied. The 356 aluminium ingot was melted at 700C then …

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Process Parameter-Microstructure-Mechanical Property Relations Of Sicp-Reinforced Aluminum Composites Produced By Powder-Injection Casting, M Bunma, P Subarporn, R Bobuangern, T Patthannkitdamrong, T Thuanwong, T Patcharawit Dec 2011

Process Parameter-Microstructure-Mechanical Property Relations Of Sicp-Reinforced Aluminum Composites Produced By Powder-Injection Casting, M Bunma, P Subarporn, R Bobuangern, T Patthannkitdamrong, T Thuanwong, T Patcharawit

Journal of Metals, Materials and Minerals

Aluminum composites are of interest for engineering applications such as electrical and especially automotive applications and their final physical and mechanical properties are usually determined by fabrication techniques. This research aimed to study effects of process parameters, which are i) argon gas flow rates at 5 and 10 l/min, and ii) casting temperatures at 620 and 680C, on integrity of the SiCp-reinforced 356 aluminum composites fabricated by powder-injection casting using a modified flux injection degassing machine. The SiCp additions are 0, 10 and 15 wt.%. Microstructure - mechanical property relations were constructed based on the predetermined process parameters. Aluminum 356 …

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Synthesis Of Aligned Carbon Nanotubes By Floating Catalyst Method Using Ferrocene, R Ravindra, B R. Bhat Dec 2011

Synthesis Of Aligned Carbon Nanotubes By Floating Catalyst Method Using Ferrocene, R Ravindra, B R. Bhat

Journal of Metals, Materials and Minerals

The aligned carbon nanotubes (CNTs) have been synthesised by floating catalyst method using ferrocene as catalyst precursor and acetylene as carbon precursor. The reaction was carried out at 850C in double stage chemical vapor deposition (CVD) apparatus. The grown aligned CNTs were purified by air oxidation and acid treatment method. The aligned CNTs were characterised by using scanning electron microscopy, transmission electron microscopy and Raman spectroscopy. The purity of CNTs was determined by Thermal analysis and X-ray diffraction method. The average diameter of aligned CNTs were around 20nm. This process not only produces aligned CNTs but also avoids the preparation …

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Multi-Properties Of Chitosan/Montmorillonite Composite Films Incorporated With Virgin And Modified Montmorillonite, S Kittinaovarat, W Nitayaphat, N Jiratumnukul, S Charuchinda Dec 2011

Multi-Properties Of Chitosan/Montmorillonite Composite Films Incorporated With Virgin And Modified Montmorillonite, S Kittinaovarat, W Nitayaphat, N Jiratumnukul, S Charuchinda

Journal of Metals, Materials and Minerals

Chitosan (CTS) composite films were prepared by blending CTS with virgin or modified montmorillonite (vMMT or mMMT, respectively) and then spin coating. XRD analysis showed a good intercalation of CTS and the mMMT in the depolymerized 15 kDa CTS/mMMT composite. The tensile strength and rigidity of the CTS/vMMT and CTS/mMMT composite films increased, whilst the elongation at break decreased, with increasing levels of vMMT or, especially, mMMT from 0.1 to 2% (w/w). Both types of CTS/MMT composite films displayed a decreased oil and water absorption with increasing levels of incorporated vMMT or mMMT. Some aggregation of vMMT but not mMMT …

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Dynamic Modeling And Characteristic Analysis Of Proton Exchange Membrane Fuel Cell, Qiu-Hong Jia, Ming Han, Bin Deng, Cai-Zhi Zhang Nov 2011

Dynamic Modeling And Characteristic Analysis Of Proton Exchange Membrane Fuel Cell, Qiu-Hong Jia, Ming Han, Bin Deng, Cai-Zhi Zhang

Journal of Electrochemistry

In this paper, a dynamic model of PEMFC is developed to estimate the dynamic performance of PEMFC by analyzing in detail the influence factors of voltage of PEMFC including various losses. The partial pressure of hydrogen and oxygen is obtained using the differential form of the ideal-gas equation in this model. The steady-state model is obtained by setting reasonable parameter values. The simulation results and experimental results have good consistency, which shows that the simulation model is correct, reasonable and effective. It analyzed the dynamic response characteristics of the output voltage and the partial pressure of hydrogen in condition of …

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