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Articles 22531 - 22560 of 27412

Full-Text Articles in Engineering

Effect Of Alkaline Solutions On Engineering Properties Of Alkali-Activated Ggbfs Paste, Tzong-Ruey Yang, Ta-Peng Chang, Bo-Tsun Chen, Jeng-Ywan Shih, Wei-Lun Lin Jun 2012

Effect Of Alkaline Solutions On Engineering Properties Of Alkali-Activated Ggbfs Paste, Tzong-Ruey Yang, Ta-Peng Chang, Bo-Tsun Chen, Jeng-Ywan Shih, Wei-Lun Lin

Journal of Marine Science and Technology–Taiwan

In this study, two kinds of alkaline solutions, sodium hydroxide (NaOH) and sodium silicate (Na2SiO3), with three dosages of 0.5, 1.0 and 1.5% by weight were used to produce the alkali-activated ground granulated blast furnace slag (GGBFS) paste at three different liquid-solid ratios by weight of 0.45, 0.5 and 0.55. Most engineering properties of the paste were examined at age of 3, 7, 14, 28 and 56 days. Experimental results show that a mixed alkaline solution of sodium hydroxide and sodium silicate is necessary to produce an alkaliactivated GGBFS paste with adequate workability and strength. Both the liquid-solid ratio and …

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A Study Of Statistical Models Application For Mixture Of High-Flowing Concrete, Ming-Chih Li, Yu-Sheng Chen, Yin-Wen Chan, Vihn Long Hoang Jun 2012

A Study Of Statistical Models Application For Mixture Of High-Flowing Concrete, Ming-Chih Li, Yu-Sheng Chen, Yin-Wen Chan, Vihn Long Hoang

Journal of Marine Science and Technology–Taiwan

High flowing concrete (HFC) is defined as a concrete that exhibits a high deformability and a good resistance to segregation. The grade of workability for HFC is concrete slump flow that between 50 to 70 cm. In the research, 21statistically balanced concrete mixtures were investigated by statistical models, and discussed further the workability, strength and durability properties of concrete, which are responded by granulated ground blastfurnace slag (GGBS), Fly ash, waterbinder ratio (w/b) and superplasticizer (sp). The Box-Wilson central composite design (CCD) method is used in this study. The total binder content is 375 kg/m3 , and four independent variables …

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The Relationship Between Migration Time In Acmt And Ponding Time In Ponding Test For Cementitious Materials, Chung-Chia Yang, Yu-Ming Tsai, Kuo-Cheng Yang Jun 2012

The Relationship Between Migration Time In Acmt And Ponding Time In Ponding Test For Cementitious Materials, Chung-Chia Yang, Yu-Ming Tsai, Kuo-Cheng Yang

Journal of Marine Science and Technology–Taiwan

The objective of this study is to investigate the relationship between the diffusion behaviors of chloride ions and the migration of chloride ions in the cementitious materials. Different kinds of mortars with different binder combination (fly ash, slag and fly ash plus slag) and w/b ratios (w/b = 0.35, 0.45, 0.55, and 0.65) were used. In this study, the diffusion test and the migration test were carried out with the ponding test (AASHTO T259) and the accelerated chloride migration test (ACMT), respectively. The chloride profiles were obtained under different ponding time with ponding test and different migration time with ACMT. …

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Prediction Model Of Air-Borne Salt Distribution In The Coastal Region Of Northern Taiwan, Yu-Sheng Chen, Hui-Jen Chiu, Yi-Wen Chan, Yung-Chang Chang, Chung-Chia Yang Jun 2012

Prediction Model Of Air-Borne Salt Distribution In The Coastal Region Of Northern Taiwan, Yu-Sheng Chen, Hui-Jen Chiu, Yi-Wen Chan, Yung-Chang Chang, Chung-Chia Yang

Journal of Marine Science and Technology–Taiwan

Taiwan is located in subtropical region, where temperature and humidity are relatively high all year round. Besides, the island is surrounded by ocean that the air-borne salt (ABS) attack is one of the major concerns for concrete structures. In this paper, a prediction model for the distribution of air-borne salt in the coastal region of northern Taiwan is proposed based on the result of ABS measurement at 38 sites near a period of four years. The ABS content was calculated monthly based on the salt concentration, water amount, time, and area of entrance. The monthly measured ABS of the entire …

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Using Mercury Intrusion Porosimetry To Study The Interfacial Properties Of Cement-Based Materials, Shih-Wei Cho Jun 2012

Using Mercury Intrusion Porosimetry To Study The Interfacial Properties Of Cement-Based Materials, Shih-Wei Cho

Journal of Marine Science and Technology–Taiwan

Cement-based material is a typical porous composite material. Pore structures and interfacial properties of cementbased materials are influenced properties of ion transport behavior and durability. This study determines pore structure by employing mercury intrusion porosimetry (MIP), with mortar specimens manufactured with three different watercement (w/c) ratios and five volume proportions of fine aggregate to investigate interfacial properties. The experimental results show that total mercury intrusion decreases with an increase in sand volume proportion when comparing the same w/c ratio. The calculated mercury intrusion of interfacial transition zone increases with w/c and the volume proportion of fine aggregate.

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The Study Of Chloride Ion Transport Behavior Of Mortar Under Different Storing Environment Temperatures, Shih-Han Weng, Chung-Chia Yang, Shih-Wei Cho, Kuo-Cheng Yang Jun 2012

The Study Of Chloride Ion Transport Behavior Of Mortar Under Different Storing Environment Temperatures, Shih-Han Weng, Chung-Chia Yang, Shih-Wei Cho, Kuo-Cheng Yang

Journal of Marine Science and Technology–Taiwan

This study presents the chloride ion transport behavior of mortar from accelerated chloride migration test (ACMT). The water/cement ratio of mortars is 0.45, and the five volume fractions of fine aggregates (0%, 15%, 30%, 50% and 60%) were evaluated. After stored under different environment temperatures (25°C, 40°C, 60°Cand 80°C), the chloride ion passing through specimens was carried out with ACMT. From the Nernest-Planck equation and modified Fick’s second law, test data could be calculate the chloride migration coefficient of non-steady-state and steady-state. For mortar structure, dilution and tortuosity effects are positive effect to resist the penetration of Chloride ion. On …

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Performance-Based Plastic Design And Energy-Based Evaluation Of Seismic Resistant Rc Moment Frame, Wen-Cheng Liao, Subhash C. Goel Jun 2012

Performance-Based Plastic Design And Energy-Based Evaluation Of Seismic Resistant Rc Moment Frame, Wen-Cheng Liao, Subhash C. Goel

Journal of Marine Science and Technology–Taiwan

This paper presents first time application of the Performance-Based Plastic Design (PBPD) approach to seismic resistant reinforced concrete special moment frames (RC SMF). Four baseline RC SMF (4, 8, 12 and 20-story) as used in the FEMA P695 were selected for this study. Those frames were redesigned by the PBPD approach. The baseline code designed frames and the PBPD frames were subjected to extensive inelastic pushover and time-history analyses. It turns out that the work-energy equation in PBPD to determine design base shear can also be used to estimate seismic demands, herein called the energy spectrum method. In summary, this …

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Effect Of Ground Granulated Blast Furnace Slag On Mechanical Behavior Of Pva-Ecc, Ing Lim, Jenn-Chuan Chern, Tony Liu, Yin-Wen Chan Jun 2012

Effect Of Ground Granulated Blast Furnace Slag On Mechanical Behavior Of Pva-Ecc, Ing Lim, Jenn-Chuan Chern, Tony Liu, Yin-Wen Chan

Journal of Marine Science and Technology–Taiwan

As the most popular construction material, concrete has many advantages compared to other materials. However, its brittle nature causes cracking and results in many deterioration problems and failures in infrastructures. Considering the issue of sustainability, researchers around the world have conducted numerous studies to develop concrete that has better performances, higher durability, longer life span, and less damaging effects to nature. To obtain such characteristics, researchers not only focus on strength enhancement, but also ductility and toughness. This paper examines the effect of using ground granulated blast furnace slag as partial cement replacement in producing engineered cementitious composite (ECC), a …

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Analysis Of Influential Factors And Association Rules For Bridge Deck Deterioration With Utilization Of National Bridge Inventory, Rong Yau Huang, Ping Fu Chen Jun 2012

Analysis Of Influential Factors And Association Rules For Bridge Deck Deterioration With Utilization Of National Bridge Inventory, Rong Yau Huang, Ping Fu Chen

Journal of Marine Science and Technology–Taiwan

Bridge is the hub of the roads and plays a crucial role in transportation. In recent years, the age of most bridges in Taiwan has gotten old gradually; as a result, the bridges deteriorate and need to be fixed and maintained. Nevertheless, it is not easy to predict the timing of bridge deterioration, and such situation has become one of the important issues in introducing the concept of preventive maintenance. In fact, in order to control the condition of bridge deterioration, many countries have set up bridge management system and regulated methods and mechanism of inspection. The record of bridge …

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Towards The Deployment And Adoption Of Location-Based Services For Optimal Mobile Communication Operations In Africa, Folasade Dahunsi May 2012

Towards The Deployment And Adoption Of Location-Based Services For Optimal Mobile Communication Operations In Africa, Folasade Dahunsi

The African Journal of Information Systems

Africa is the world’s second largest and second most populous continent with about one billion people. Mobile phones are a major source of communication and means of taking information and technology to rural and remote areas of the continent. With low-cost and readily available mobile phones, underprivileged, low-income earners and rural dwellers can also participate in the Information and Communication Technology (ICT) revolution. Services are introduced by mobile operators and vendors to enhance and optimize this mobile evolution. One of such service is location-based services (LBS); LBS make available personalized services based on the geographical location of the subscriber’s phone. …

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An End To End-To-End? A Review Essay Of Barbara Van Schewick’S Internet Architecture And Innovation, Adam Candeub May 2012

An End To End-To-End? A Review Essay Of Barbara Van Schewick’S Internet Architecture And Innovation, Adam Candeub

Federal Communications Law Journal

Amidst much controversy, the FCC released its landmark "network neutrality" order in December 2010. This regulation prohibits Internet service providers, such as Verizon or Comcast, from discriminating in favor of traffic or content that they own or with which they are affiliated. Professor Barbara van Schewick's recently published book, Internet Architecture and Innovation, could not be timelier. Employing a variety of economic and technical arguments, van Schewick defends the type of regulation the FCC passed as necessary to preserve the Internet's potential for innovation. My central critique of Internet Architecture is its deployment of economic theories on one side of …

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Bs News May/June May 2012

Bs News May/June

Building Services Engineering

No abstract provided.

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Electrochemical Preparation Of Nanostructural Pt-Ni And Pd-Ni Films For Ethanol Electro-Oxidation, Chen-Zhong Yao, Hui-Xuan Ma, Bo-Hui Wei Apr 2012

Electrochemical Preparation Of Nanostructural Pt-Ni And Pd-Ni Films For Ethanol Electro-Oxidation, Chen-Zhong Yao, Hui-Xuan Ma, Bo-Hui Wei

Journal of Electrochemistry

The Pt-Ni and Pd-Ni films were successfully prepared on Ti substrates by electrodeposition method. The porous Pt-Ni nanoflakes appeared to be uniform with the thickness of the slices about 10 ~ 20 nm. The porous Pd-Ni nanoparticles with a flower shape appeared to be uniform with the diameters of 50 ~ 60 nm. The XRD patterns also indicated that the Pd-Ni and Pt-Ni nanostructures have the poor crystallinity. The onset potentials of ethanol oxidation were negatively shifted to –0.74 V on Pt-Ni electrodes and –0.71 V on Pd-Ni electrodes, respectively. Addition of Ni could enhance catalytic activities and antitoxic properties …

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Synthesis Of Lini0.5Co0.2Mn0.3O2 For Lithium Ion Batteries And The Mechanism Of Capacity Fading At High Temperature, Wen Liu, Miao Wang, Ji-Tao Chen, Xin-Xiang Zhang, Heng-Hui Zhou Apr 2012

Synthesis Of Lini0.5Co0.2Mn0.3O2 For Lithium Ion Batteries And The Mechanism Of Capacity Fading At High Temperature, Wen Liu, Miao Wang, Ji-Tao Chen, Xin-Xiang Zhang, Heng-Hui Zhou

Journal of Electrochemistry

The Ni-rich cathode materials, LiNi0.5Co0.2Mn0.3O2, have been synthesized by Co-precipitation and high-temperature solid-phase sintering method. Constant current charge-discharge tests showed high discharge capacity of 179.2 mAh·g-1 in the 3.0~4.4 V at 0.2C. However, at 55 °C the LiNi0.5Co0.2Mn0.3O2 experienced the dramatic capacity fading after 100 charge-discharge cycles. Electrochemical Impedance Spectroscopy, X-Ray Photoelectron Spectroscopy, Atomic Emission Spectroscopy have been employed to study the capacity fading mechanism of LiNi0.5Co0.2Mn0.3O2 cycled at high temperature in range of high-voltage charge and …

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Electrochemical Performances Of Carbon-Coated Na2Ti6O13 Nanotubes, Guo-Ran Li, Shuai Sun, Xue-Ping Gao Apr 2012

Electrochemical Performances Of Carbon-Coated Na2Ti6O13 Nanotubes, Guo-Ran Li, Shuai Sun, Xue-Ping Gao

Journal of Electrochemistry

With rutile TiO2 and NaOH as starting materials, the Na2Ti6O13 nanotubes were prepared by a hydrothermal reaction. The carbon-coated Na2Ti6O13 nanotubes were obtained by treating the Na2Ti6O13 nanotubes for 4 h in glucose aqueous solutions containing 0.1 mol·L-1 NaOH. The as-prepared samples were characterized by X-ray diffraction (XRD), scanning electron microscopy (SEM) and transmission electron microcopy (TEM). The results showed that the dimensions of carbon-coated Na2Ti6O13 nanotubes were 14 ~ 19 nm of outer diameter, 2 ~ 5 …

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Synthesis And Electrochemical Properties Of Yttrium-Doped Lini0.49Mn1.49Y0.02O4, Xian-Wen Zhang, Zheng-Xi Zhang, Li Yang, Shao-Hua Fang, Long Qu Apr 2012

Synthesis And Electrochemical Properties Of Yttrium-Doped Lini0.49Mn1.49Y0.02O4, Xian-Wen Zhang, Zheng-Xi Zhang, Li Yang, Shao-Hua Fang, Long Qu

Journal of Electrochemistry

The LiNi0.49Mn1.49Y0.02O4 cathode material was synthesized using the citric acid-assisted sol-gel method by partial substitutions of Ni and Mn with Y in the LiNi0.5Mn1.5O4 material. The influences of Y doping on the structure and electrochemical properties were investigated by means of X-ray diffraction, cyclic voltammetry, galvanostatic charge/discharge tests and AC impedance spectroscopy. The results showed that the introduction of Y into the LiNi0.5Mn1.5O4 greatly improved the cycle performance and rate capability. When the charge and discharge current was 1 C in the potential …

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Template-Free Synthesis Of Porous Nio Hierarchical Structure For High Performance Supercapacitors, Yun Huang, Zhong Wu, Xin-Bo Zhang Apr 2012

Template-Free Synthesis Of Porous Nio Hierarchical Structure For High Performance Supercapacitors, Yun Huang, Zhong Wu, Xin-Bo Zhang

Journal of Electrochemistry

A facile and template-free hydrothermal method is proposed to successfully synthesize porous NiO hierarchical structure, which is found to be assembled from ultrathin NiO nanosheets. As for electrochemical pseudocapacitor application, the obtained material exhibits not only high specific capacitances of 435 F·g-1 at 20 mV·s-1 and 367 F·g-1 at 10 A·g-1, but also holds a good electrochemical stability over 1000 cycles at a current rate of 20 mV·s-1. These results suggest that the hierarchical structured porous NiO is a promising supercapacitor electrode material.

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Electrochemical Reduction Of Co2 On Sn/Cu Electrodes, Chen-Chen Zhao, Jian-Wei Guo, Li Wang, Xiang-Ming He, Cheng Wang, Zhi-Xiang Liu Apr 2012

Electrochemical Reduction Of Co2 On Sn/Cu Electrodes, Chen-Chen Zhao, Jian-Wei Guo, Li Wang, Xiang-Ming He, Cheng Wang, Zhi-Xiang Liu

Journal of Electrochemistry

The Sn/Cu electrodes were prepared by electroplating method and their morphologies under different galvanization current densities were determined by SEM. In alkali, the effects of Sn/Cu electrodes on the activities towards hydrogen evolution and electrochemical reduction of CO2 were investigated in alkaline solutions using a three-electrode system. These results indicated that the Sn/Cu electrodes prepared at 10 mA/cm2 and 15 mA/cm2 showed good activities, while that prepared at 15 mA/cm2 was even better in activities. The synergetic structure of the Sn/Cu electrode to be beneficial to electrochemical reduction of CO2 has been pointed out.

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Electrochemical Properties Of The Keggin-Type Lacunary Heteropolysilicate Anion And Its Eectrocatalysis For H2O2 Reduction, Xi-Long Liu, Chun-Yan Wu, Fang Zhou, Hong-Sheng Liu, Ying-Jie Hua, Chong-Tai Wang, Xiao-Yang Liu Apr 2012

Electrochemical Properties Of The Keggin-Type Lacunary Heteropolysilicate Anion And Its Eectrocatalysis For H2O2 Reduction, Xi-Long Liu, Chun-Yan Wu, Fang Zhou, Hong-Sheng Liu, Ying-Jie Hua, Chong-Tai Wang, Xiao-Yang Liu

Journal of Electrochemistry

Electrochemical properties of the Keggin-type lacunary heteropolysilicate anion SiW11O398- (SiW11) and its indirect electrocatalysis for H2O2 reduction in the supporting electrolyte containing 0.1 mol·L-1 NaHSO4 and Na2SO4 solutions were investigated using cyclic voltammetry, square wave voltammetry and alternating current impedance spectroscopy. Experimental results indicated that SiW11 showed two pairs of reversible redox waves on the glassy carbon (GC) electrode in an acidic solution. The electron transfer number corresponding to the two pairs of waves was one, and the proton transfer number involved was two during …

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NaXMYFe(Cn)6(M=Fe, Co, Ni): A New Class Of Cathode Materials For Sodium Ion Batteries, Jiang-Feng Qian, Min Zhou, Yu-Liang Cao, Han-Xi Yang Apr 2012

NaXMYFe(Cn)6(M=Fe, Co, Ni): A New Class Of Cathode Materials For Sodium Ion Batteries, Jiang-Feng Qian, Min Zhou, Yu-Liang Cao, Han-Xi Yang

Journal of Electrochemistry

Three types of Prussian blue compounds, NaxMyFe(CN)6 (M = Fe, Co, Ni), were prepared simply by solution precipitation method and tested as cathode materials for sodium-ion batteries. X-ray diffraction and SEM measurements demonstrated that the prepared materials, namely, NaFeFe(CN)6, Na2CoFe(CN)6, and Na2NiFe(CN)6, exhibited a perfect cubic structure with a particle size of several tens nanometers. Cyclic voltammetric and galvanostatic cycling tests revealed very different electrochemical behaviors of these three materials. The specific capacities of NaFeFe(CN)6 and Na2CoFe(CN)6 could reach 113 mAh·g …

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Preparation And Electrochemical Performance Of Mo-Doped Li3V2(Po4)3/C Cathode Materials, Zhi-Yuan Tang, Wei Yuan, Ji Yan, Wen-Feng Mao, Li Ma Apr 2012

Preparation And Electrochemical Performance Of Mo-Doped Li3V2(Po4)3/C Cathode Materials, Zhi-Yuan Tang, Wei Yuan, Ji Yan, Wen-Feng Mao, Li Ma

Journal of Electrochemistry

The molybdenum-doped Li3V2-xMox(PO4)3/C (x = 0.01, 0.02 and 0.03) cathode materials were prepared with a sol-gel method by using Li2CO3, NH4H2PO4, V2O5 and MoO3 as raw materials, and citric acid as both chelating reagent and carbon source. The X-ray diffraction (XRD) analyses showed that the crystal structure of as-prepared samples is monoclinic with space group P21/n. Scanning electron microscopy (SEM) observations indicated the uniform morphology for Li3Mo0.02V1.98(PO4) …

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Synthesis And Electrochemical Properties Of Lifeso4F/Graphene Composite As Cathode Material For Lithium-Ion Batteries, Wei Guo, Ya-Xia Yin, Li-Jun Wan, Yu-Guo Guo Apr 2012

Synthesis And Electrochemical Properties Of Lifeso4F/Graphene Composite As Cathode Material For Lithium-Ion Batteries, Wei Guo, Ya-Xia Yin, Li-Jun Wan, Yu-Guo Guo

Journal of Electrochemistry

The LiFeSO4F was successfully synthesized from the reactions of FeSO4∙xH2O (x=1, 4, 7) with LiF in tetraethylene glycol media through a facile low temperature method. The structures and microscopic features of the products were characterized by XRD, SEM and TEM. TGA result shows the good thermal stability of the as-prepared LiFeSO4F. No diffraction peaks of the FeSO4 are observed in the as-prepared products with the starting material of either FeSO4∙4H2O or FeSO4∙7H2O, which should be ascribed to delaying the release of H2 …

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Corrosion Inhibition Of 316l Steel Using Sodium Diethyl Dithiocarbamate Solution In Simulated Crude Oil, Xiao-Guang Ren, Jie Yang Apr 2012

Corrosion Inhibition Of 316l Steel Using Sodium Diethyl Dithiocarbamate Solution In Simulated Crude Oil, Xiao-Guang Ren, Jie Yang

Journal of Electrochemistry

The corrosion inhibition behaviors of 316L steel using the sodium diethyl dithiocarbamate (SDDTC) compound in the crude simulation solution were studied in the absence and presence of zinc sulfate or sodium chromate with different compositions. Experiment resultss showed that in the environments of highly acidic and high concentrations of chloride ions the SDDTC compound could well inhibit the corrosion of 316L steel. The good synergic effects on the corrosion inhibition of 316L steel by additions of either zinc sulfate or sodium chromate into SDDTC compound were indicated in this study, which is of great significance and importance in practical applications.

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Ethanol Electrooxidation On Pt/Mo2/Cnts Catalysts, Yu-Long Cheng, Jie Sun, Ji-Gang Li, Li-Gong Zhang, Tian Zhou, Geng Chang, Zhong-Chao Dong Apr 2012

Ethanol Electrooxidation On Pt/Mo2/Cnts Catalysts, Yu-Long Cheng, Jie Sun, Ji-Gang Li, Li-Gong Zhang, Tian Zhou, Geng Chang, Zhong-Chao Dong

Journal of Electrochemistry

The ethanol electrooxidation behaviors on Pt/MO2/CNTs（M=Sn, Ti, Ce）and Pt/CNTs catalysts in H2SO4 solutions were researched by cyclic voltammetry. It has revealed that the catalysts with the addition of metal oxides presented higher electrooxidation activity for ethanol, in particular, the Pt/CeO2/CNTs catalyst showed the best activity for ethanol electrooxidation intermediate. The Pt/SnO2/CNTs catalyst demonstrated the best ethanol electrooxidation activity when considering the synthetic effects of such parameters as the onset oxidation potential, peak current densities and total oxidation area.

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Catalytic Activities Of Electrochemically Dealloyed Pt(Pd)-Cu Catalysts For Oxygen Reduction Reaction, Rui-Zhi Yang, Strasser Peter, Toney Michael Apr 2012

Catalytic Activities Of Electrochemically Dealloyed Pt(Pd)-Cu Catalysts For Oxygen Reduction Reaction, Rui-Zhi Yang, Strasser Peter, Toney Michael

Journal of Electrochemistry

The electrochemically dealloyed Pt(Pd)-Cu catalysts were prepared by electrochemical dealloying of Cu3Pt(Pd) and their catalytic activities toward oxygen reduction reaction (ORR) were studied in 0.1 mol·L-1 HClO4 . solutions. The structural features of the dealloyed Pt(Pd)-Cu were revealed by synchrotron-based anomalous X-ray diffraction (AXRD) and surface X-ray scattering (SXS) at an atomic scale. We established a relationship between the structure and the catalytic activity by comparing the ORR activity and the structure of dealloyed Cu3Pt nanoparticles with similarly dealloyed Cu3Pt thin films and Cu3Pt(111). The enhancement in the activity of …

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Electrocatalytic Oxidation Of Ethanol On Ni-P-Tio2 Composite Coating Electrodes, Guang-Hui Hu, Hai-Xia Zeng, Zhi-Gang Wei, Zhan-Chang Pan, Shu-Guang Xie, Yan-Di Zou Apr 2012

Electrocatalytic Oxidation Of Ethanol On Ni-P-Tio2 Composite Coating Electrodes, Guang-Hui Hu, Hai-Xia Zeng, Zhi-Gang Wei, Zhan-Chang Pan, Shu-Guang Xie, Yan-Di Zou

Journal of Electrochemistry

The Ni-P-TiO2 composite coating electrodes with different contents of TiO2 particulates were prepared by electroless plating technique from Ni-P plating bath containing TiO2 powders on brass. Cyclic voltammetry, linear sweep voltammetry (LSV), chronoamperometry and electrochemical impedance spectroscopy (EIS) were used to test the electrochemical performance of Ni-P-TiO2/Cu electrodes. It was indicated that the Ni-P-TiO2/Cu electrodes exhibited very strong electrocatalytic activity toward the oxidation of ethanol in alkaline medium at ambient temperature. The electrocatalytic activity of ethanol oxidation on the Ni-P-TiO2 electrodes depended on the amounts of TiO2 in the coatings. The …

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Fabrication Of Composite Wick Structure Heat Spreader, Sheng-Hong Tsai, Yu-Tang Chen, Shung-Wen Kang Apr 2012

Fabrication Of Composite Wick Structure Heat Spreader, Sheng-Hong Tsai, Yu-Tang Chen, Shung-Wen Kang

Journal of Marine Science and Technology–Taiwan

A novel heat spreader was developed with its main cavity of copper tube, where copper mesh and support structure was served as the capillary constructions. The size of the support structure was 73 mm × 48.5 mm × 2.7 mm. Ceramic heater, 30 mm × 30 mm, was used as the heating source with the output power from 10 Watts to 130 Watts, and utilized the heat sink integrated with fan as the cooler. De-ion water was employed as the working fluid with the same filling charge. When heating power was 130 Watts, the temperature of heat source in heat …

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Design Optimal Control Of Ship Maneuver Patterns For Collision Avoidance: A Review, Chia-Hung Shih, Po-Hsuan Huang, Saburo Yamamura, Chen-Yuan Chen Apr 2012

Design Optimal Control Of Ship Maneuver Patterns For Collision Avoidance: A Review, Chia-Hung Shih, Po-Hsuan Huang, Saburo Yamamura, Chen-Yuan Chen

Journal of Marine Science and Technology–Taiwan

Although there have been lots studies about vehicular maneuvers on land or sea, maneuvers within a small area that require direction changes have rarely been discussed. Many reports on the arrival or departure of ships from ports have revealed more about what are safe and effective turning maneuvers within a narrow area. Convenient navigation systems for ship maneuvering should allow quick avoidance of obstacle to find the shortest distance in the whole seaway is important. This study proposes a review model that will satisfy optimal turning maneuvering anywhere and be applicable to any type of ship. However, the water-based environment …

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The Improvement Of Heat Insulation For Roof Steel Plates By Triz Application, Ruey-Sen Chiu, Shao-Tsai Cheng Apr 2012

The Improvement Of Heat Insulation For Roof Steel Plates By Triz Application, Ruey-Sen Chiu, Shao-Tsai Cheng

Journal of Marine Science and Technology–Taiwan

More and more colored plates have been used on roofs in the steel buildings in Taiwan, such as roofs of high-technology factories and offices of large-scale construction sites. Facing the impacts of global economic crisis as well as the exhaustion of natural resources, we should seriously look at the issue of energy saving and try every possible method to save energy in daily life. In architecture industry, architects have devoted themselves to green buildings. However, there should be an inventive way to upgrade heat insulation of external building structures. The studies on this topic in Taiwan mainly focus on the …

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Corrosion Related Property Improvement For Cement Mortar Applied To Marine Environment, Pei-Ying Chung, Hsien Hua Lee, Meng-Syun Yu Apr 2012

Corrosion Related Property Improvement For Cement Mortar Applied To Marine Environment, Pei-Ying Chung, Hsien Hua Lee, Meng-Syun Yu

Journal of Marine Science and Technology–Taiwan

It is a well known fact that infrastructures in marine environments are subjected to corrosion attacks all the time. The most severe corrosion happens to the steel materials that are directly exposed in the marine environment, particularly for the portion exposed in the splash zone, where the air (oxygen) is embroiled with water causing a wet and dry alternately exerting environment. The most widely used material of marine infrastructure, such as reinforced concrete, is also subjected to deterioration damage from the marine environment. In this way, it weakens the impermeability of the material so that the sea water is allowed …

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