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Articles 31 - 60 of 197
Full-Text Articles in Engineering
Airports And Loci Of Aviation: Security Guidelines For Physical Design And Modification, Ibpp Editor
Airports And Loci Of Aviation: Security Guidelines For Physical Design And Modification, Ibpp Editor
International Bulletin of Political Psychology
This article provides guidelines for the design and modification of loci and aviation from a security perspective.
The Evaluation Of Aviation Security And Security Incidents, Ibpp Editor
The Evaluation Of Aviation Security And Security Incidents, Ibpp Editor
International Bulletin of Political Psychology
This article describes several difficulties in evaluating the efficacy of aviation security policies, programs, strategies, and tactics.
Motivation And Aviation As A Terrorism Target, Ibpp Editor
Motivation And Aviation As A Terrorism Target, Ibpp Editor
International Bulletin of Political Psychology
This article describes the content and dynamics of terrorist motivation towards targeting aviation.
Trends. Legislation, Bias, And The Funding Of Security Technology And Services, Ibpp Editor
Trends. Legislation, Bias, And The Funding Of Security Technology And Services, Ibpp Editor
International Bulletin of Political Psychology
This Trends article discusses the funding of security technologies and services, and the costs of potential bias in terms of legislation and procedures.
Weapons On Aircraft And Aviation Security, Ibpp Editor
Weapons On Aircraft And Aviation Security, Ibpp Editor
International Bulletin of Political Psychology
This article presents Issues to consider in developing aviation security policy on the deployment and employment of weapons on aircraft by aircrew and air marshals.
Biometric, Psychometric, And Sociometric Profiling, Ibpp Editor
Biometric, Psychometric, And Sociometric Profiling, Ibpp Editor
International Bulletin of Political Psychology
This article articulates basic Issues in developing security-based profiling technologies.
Intelligence Support For Aviation Security, Ibpp Editor
Intelligence Support For Aviation Security, Ibpp Editor
International Bulletin of Political Psychology
This article describes an introduction to and critique of intelligence support for aviation security.
Commentary On Philosophy And Aviation Security, Ibpp Editor
Commentary On Philosophy And Aviation Security, Ibpp Editor
International Bulletin of Political Psychology
This article outlines how the formal study of philosophy can be applied to aviation security, considering the merits of the inclusion of philosophers in the international working groups tasked with discerning and commenting on aviation security trends and their relevance for intelligence and security activities.
A Simplified Approach To Estimate The Ultimate Longitudinal Strength Of Ship Hull, Hsin-Chuan Kuo, Jiang-Ren Chang
A Simplified Approach To Estimate The Ultimate Longitudinal Strength Of Ship Hull, Hsin-Chuan Kuo, Jiang-Ren Chang
Journal of Marine Science and Technology
In this paper, the calculation of the ultimate longitudinal strength of the ship hull is revisited. A simplified approach dealing with the longitudinal ultimate strength of ship hull has been developed and an effective numerical program is implemented based on the individual components of ship structures. It is, then, possible to find the ultimate strength of the whole ship structure by evaluating those individual components. Comparisons of numerical results from the proposed approach and published literatures are conducted for further validation. Since relative errors of calculations of the current approach to the literature with respect to the experimental data are …
An Analytical Model For Deflection Of Laterally Loaded Piles, Jen-Cheng Liao, San-Shyan Lin
An Analytical Model For Deflection Of Laterally Loaded Piles, Jen-Cheng Liao, San-Shyan Lin
Journal of Marine Science and Technology
Load-deflection responses of laterally loaded piles are often obtained via in-situ lateral pile load tests. Problems of such tests are the difficulties occurring during data interpretation. In an effort to develop an efficient analytical method for analyzing deformation data of lateral loaded piles, an analytical model is proposed based on energy conservation of pile-soil system. The proposed analytical model not only provides a direct solution of the pile deflection function, but also has less need of complicated subsurface soil properties. In this paper, the authors present the theory and analytical model development of the proposed method. Two real cases are …
A Practical Experience About Dynamic Performance And Stability Improvement Of Synchronous Generators, Chi-Jui Wu, Yung-Sung Chuang
A Practical Experience About Dynamic Performance And Stability Improvement Of Synchronous Generators, Chi-Jui Wu, Yung-Sung Chuang
Journal of Marine Science and Technology
This paper describes the practical experiences about the no-load dynamic performance test, parameter identification, and tuning of static excitation systems (SESs) of the synchronous generators in the Tong-Shiao Generation Station of the Taiwan Power System. The dynamic stability of under-load generators has also been improved. The hardware circuits of SESs had been modified. This caused the detuning of parameter values, so that the generators did not have enough ability to sustain voltage fluctuation disturbances. Several SESs had been preliminarily retuned according to the results from simple field tests. However, step signal responses in field tests revealed that the characteristics of …
Experimental Study Of The Rheological Behaviors Of Fresh Concrete, Mortar, And Clay Grout, Cho-Liang Tsai, Yun Du, Yi-Shiun Tsai
Experimental Study Of The Rheological Behaviors Of Fresh Concrete, Mortar, And Clay Grout, Cho-Liang Tsai, Yun Du, Yi-Shiun Tsai
Journal of Marine Science and Technology
Most studies assume that fresh concrete is a Bingham fluid, but few studies precisely measure its Bingham constants, shear yield stress and viscosity, especially for normal fresh concrete. In stead of using commercial viscometer, this work developed a new experimental method and analytical procedure, based on the Stokes’ flow, for characterizing rheological properties of fluids. The experimental method developed here involved dragging a sphere submerged in the specimen fluid at a constant speed and measuring the resistance. Rheological properties of the specimen fluid can be calculated from the theoretical function correlating the drag velocity, drag force, and rheological properties of …
Model-Based Fuzzy Modeling And Control For Autonomous Underwater Vehicles In The Horizontal Plane, Wen-Jer Chang, Wei Chang, Hsien-Hsueh Liu
Model-Based Fuzzy Modeling And Control For Autonomous Underwater Vehicles In The Horizontal Plane, Wen-Jer Chang, Wei Chang, Hsien-Hsueh Liu
Journal of Marine Science and Technology
In this paper, the modeling and control of nonlinear Autonomous Underwater Vehicle (AUV) system is considered by using a TakagiSugeno (T − S) type fuzzy model. Applying the AUV T − S fuzzy model, one can develop a model-based fuzzy controller design utilizing the concept of Parallel Distributed Compensation (PDC). The main idea of the controller design approach is to derive each control rule so as to compensate each rule of a fuzzy system. The design procedure is conceptually simple and natural. Finally, the responses of states of AUV dynamic real system and AUV dynamic T − S fuzzy model …
Magneto-Hydrodynamic Squeeze Film Characteristics Between A Sphere And A Plane Surface, Tsu-Liang Chou, Jen-Wen Lai, Jaw-Ren Lin
Magneto-Hydrodynamic Squeeze Film Characteristics Between A Sphere And A Plane Surface, Tsu-Liang Chou, Jen-Wen Lai, Jaw-Ren Lin
Journal of Marine Science and Technology
Based upon the thin-film magneto-hydrodynamic (MHD) theory, this paper analyzes the squeeze-film characteristics between a sphere and plane surface lubricated with an electrically conducting fluid in the presence of a transverse magnetic field. The MHD Reynolds-type equation governing the squeeze-film pressure is derived using the continuity equation and the magneto-hydrodynamic motion equations. A closed-form solution for the squeezing film pressure is obtained, and applied to predict the MHD squeeze-film characteristics. According to the results obtained, the presence of externally applied magnetic fields signifies an enhancement in the squeeze-film pressure. On the whole, the magnetic-field effects characterized by the Hartmann number …
Synthesis Of Polyunit Vapor Phase Inhibitor And Its Volatile Corrosion Inhibition Performance, Da-Quan Zhang, Li-Xin Gao, Guo-Ding Zhou
Synthesis Of Polyunit Vapor Phase Inhibitor And Its Volatile Corrosion Inhibition Performance, Da-Quan Zhang, Li-Xin Gao, Guo-Ding Zhou
Journal of Electrochemistry
A Mannich Base derivative (BMMCH), containing two morpholinum moieties and one cyclohexylamnonium moiety, was synthesized through aminomethy1 reaction. Its configuration was verified by IR and 1H_NMR. Its volatile rustproofing effect was appraised by volatile rustproofing sieve test and vapor inhabitability test. The result shows that BMMCH has good protection effect for carbon steel. BMMCH has lower volatility compared with dicyclohexylamnonium nitrite (DICHAN) via closed space volatile weight_loss test. The inhibition mechanism was studied by potentiodynamic polarization electrochemistry technique in ASTM simulated atmospheric water. The corrosion potential of carbon steel electrode shifted to a negative direction when BMMCH was joined in. …
Comparison Of Thermal Cyclic Oxidation Of The Pvd Ni-Al And Hvof-Mcraly Coatings, Chang J.T., H. Yeh C., He J.L., Chen K.C.
Comparison Of Thermal Cyclic Oxidation Of The Pvd Ni-Al And Hvof-Mcraly Coatings, Chang J.T., H. Yeh C., He J.L., Chen K.C.
Journal of Electrochemistry
A PVD process_cathodic arc plasma ion plating was used to deposit Ni_Al films on Inconel 600 superalloy. The oxidation behaviors of PVD Ni_Al coating and the thermal sprayed CoCrAlY coatings were revealed and compared by performing cyclic thermal oxidation test at 1 100 ℃ to evaluate its feasibility. Experimental results showed that the films with different compositions of Ni 62 Al 38 , Ni 63 Al 37 and Ni 69 Al 31 could be obtained when using Ni 52 Al 48 , Ni 60 Al 40 and Ni 70 Al 30 as targets, respectively. During the cyclic thermal oxidation test, …
Electrochemistry And Electrocatalysis Of A Novel Μ-Oxamido Copper(Ⅱ) Binuclear Complex, Gui-Lian Gao, Guo-Bao Li, Qiu-Xia Yang, Xue-Lin Wang
Electrochemistry And Electrocatalysis Of A Novel Μ-Oxamido Copper(Ⅱ) Binuclear Complex, Gui-Lian Gao, Guo-Bao Li, Qiu-Xia Yang, Xue-Lin Wang
Journal of Electrochemistry
In this paper,the cyclic voltammetric and spectroelectrochemical behaviors of μ _oxamido Copper(Ⅱ) Binuclear Complex (deCu) in PBS were studied.Cyclic voltammograms of this complex in PBS(pH=9)exhibited two reductive peaks( E pc1 =-0.25 V, E pc2 =-0.50 V)at hanging mercury drop electrode(HMDE),peaks at -0.50 V and -0.25 V corresponded to the reduction of ligand and copper(Ⅱ)_complex, respectively.The spectroelectrochimical experiments showed that there was a new absorption band at 440 nm,and the absorption peaks at 270 nm,280 nm red shifted to 300 nm,310 nm under potential of -0.75 V.It was meant that the Cu(Ⅱ) turned into low valent copper,simultaneously,a new large coupling system …
Severe Corrosivity And Its Eletrochemical Mechanism Of Seawater In Xiamen Sea Area To Al-Mg Alloys, Le-Yun Lin, Yue-Hong Zhao
Severe Corrosivity And Its Eletrochemical Mechanism Of Seawater In Xiamen Sea Area To Al-Mg Alloys, Le-Yun Lin, Yue-Hong Zhao
Journal of Electrochemistry
The surface layer seawater of different sea areas in China exhibit different corrosivity to Al_Mg alloys according to the experiment results of 16 years exposure in seawater.The seawater in Xiamen sea area possesses severe corrosivity while seawater in Qingdao possesses the mildest corrosivity to Al_Mg alloys with better regularity of corrosion behavior.The present paper illustrates by experiment data that the strongest corrosivity of Xiamen seawater to Al_Mg alloys is owing to the low salinity of the seawater and the “electrolyte effect” come from it.The 16 year corrosion data and corrosion morphology of the typical Al_Mg alloys from full_immersion zone,tide zone …
An Electrochemical Prediction Method For Caustic Scc Of Fe-Cr-Ni Alloy, Chun-Bo Huang, Zhan-Peng Lv, Wu Yang
An Electrochemical Prediction Method For Caustic Scc Of Fe-Cr-Ni Alloy, Chun-Bo Huang, Zhan-Peng Lv, Wu Yang
Journal of Electrochemistry
Stress corrosion cracking (SCC) of Fe_Cr_Ni alloy (alloy 800 M) in hot concentrated caustic solution was investigated by means of tests of C_rings under controlled potentials. The steady dissolution current densities( i st ) of the plate specimens and C_rings polarized potentiostatically were measured. The simplifed steady potentiostatical curves were drawn on the basis of i st . The ratio R PD measured from i st and steady passive current density i p at low potentials ( R PD = i st / i p ) was designed as a polarization dissolution susceptibility parameter. The parameter R PD values of …
Influence Of Marine Organisms Upon Corrosion Of Steel Piling Systems, Jiunn-Shyong Luo, Cliff Cliff, Rau Rau, Kuei-Ching Chen
Influence Of Marine Organisms Upon Corrosion Of Steel Piling Systems, Jiunn-Shyong Luo, Cliff Cliff, Rau Rau, Kuei-Ching Chen
Journal of Electrochemistry
To study the influence of marine organisms upon corrosion of ASTM A36 steel piling sysems,specimens were immersed in both natural and synthetic seawater.Electrochemical techniques such as linear polarization resistance and electrochemical impedance scan(EIS) were applied to evaluate corrosion of the steel.The results indicated that attachment of marine organisms to form fouling layers on the steel surface reduced general corrosion,but localized corrosion occurred underneath marine organisms.An equivalent circuit model was established to simulate attachment of marine organisms upon carbon carbon steel surfaces.
Synthesis And Electrochemical Properties Of K_2feo_4, Ning Zhou, Shi-Hai Ye, Yong-Long Wang, Xue-Ping Gao, Dong-Feng Lin, Zuo-Xiang Zhou, De-Ying Song
Synthesis And Electrochemical Properties Of K_2feo_4, Ning Zhou, Shi-Hai Ye, Yong-Long Wang, Xue-Ping Gao, Dong-Feng Lin, Zuo-Xiang Zhou, De-Ying Song
Journal of Electrochemistry
The K 2FeO 4 used for new positive electrode materials was prepared. The primary batteries were used in different concentration of electrolyte and different currents. In 9 mol/L KOH , the capacity was the best. The higher the concentration of electrolyte, the lower the electric potential was. When the batteries discharged in 0.4 C , the capacity reached 521.3 mAh/g. By XRD, we gave the reasonable explanations for the discharge products of K 2FeO 4. Possible mechanism of discharge is discussed.
The Technique Of Rare-Earth Conversion Coatings On Aluminum Alloy, Jun-Tao Wang, Jian-Hua Wu, Guang-Zhang Chen
The Technique Of Rare-Earth Conversion Coatings On Aluminum Alloy, Jun-Tao Wang, Jian-Hua Wu, Guang-Zhang Chen
Journal of Electrochemistry
The orthogonal design was used to screen the film_forming technique on LY12 aluminum alloy using quadrivalent cerium salt, and the corrosion_resistance performance of the coating was studied. The results revealed that: after LY12 aluminum alloy was treated by cerium salt, its pitting potential shifts to positive direction while the corrosion potential slightly decreases, showing that the alloy becomes less sensitive to pitting corrosion was greatly improved, comparable to that after chromate treatment; in addition, by combining the results of electrochemical measurements with surface analysis, the mechanism of corrosion_resistance on the race_earth conversion coating of the aluminum alloy was also discussed.
Effect Of Heat Laminating Aggregation Status Of Polymer Lithium-Ion Battery Cathode On Battery Performance, Ming-Gang Jin, Quan-Feng Dong, Ming-Sen Zheng, Li Huang, Hui-Qun Cai, Jin-Qua You, Zu-Geng Lin
Effect Of Heat Laminating Aggregation Status Of Polymer Lithium-Ion Battery Cathode On Battery Performance, Ming-Gang Jin, Quan-Feng Dong, Ming-Sen Zheng, Li Huang, Hui-Qun Cai, Jin-Qua You, Zu-Geng Lin
Journal of Electrochemistry
Multi_layer heat laminated polymer lithium ion battery was made, the effect of temperature of cathode laminating on battry performance was also investigated. It was discovered that suitable temperature of cathode laminating is critical to battery performance and is a key parameter to manufacture process control of polymer lithium ion battery.
Corrosion Fatigue And Dynamic Strain Aging Of Duplex Stainless Steel In Aqueous Solution, Chuan-Ming Tseng, I-Hsuang Lo, Wen-Ta Tsai
Corrosion Fatigue And Dynamic Strain Aging Of Duplex Stainless Steel In Aqueous Solution, Chuan-Ming Tseng, I-Hsuang Lo, Wen-Ta Tsai
Journal of Electrochemistry
The corrosion fatigue and dynamic strain aging behaviors of 22%Cr duplex stainless steel (DSS) in sodium chloride solutions were investigated. Austenitic 316L SS and ferrtic 430 SS were also used in this study for a comparison. The experimental results showed that no stress corrosion cracking (SCC) occurred in all these SSs tested in 3.5wt% NaCl solution at 80 ℃. However, dynamic strain aging (DSA) occurred in 316L austenitic SS and 22%Cr DSS during slow strain rate testing (SSRT) in this solution.The occurrence of DSA was dependent on solution temperature,strain rate and the presence of austenitic phase. The corrosion rate of …
Fabrication Of Scanning Micro Cl~- Probe And In Situ Imaging Of Cl~- At The Interface Of 2024 Al Aloy/Solution, Yu-Hua Lin, Min-Hua Shao, Rong-Gang Hu, Yan Li, Rong-Gui Du, Chang-Jian Lin
Fabrication Of Scanning Micro Cl~- Probe And In Situ Imaging Of Cl~- At The Interface Of 2024 Al Aloy/Solution, Yu-Hua Lin, Min-Hua Shao, Rong-Gang Hu, Yan Li, Rong-Gui Du, Chang-Jian Lin
Journal of Electrochemistry
Micro combination Ag/AgCl electrode with a tip measuring tens micron in diameter was fabricated. The probe satisfied in situ imaging of Cl - distribution at metal surface in chloride solution because of its excellent linearity between potential and Cl - concentration, rapid response, good stability and selectivity. With the aid of the home made Micro Electrode Scanning system and scanning Cl - probe, the effect of the [Cl - ] at 2024_Al/solution interface on localized corrosion process was investigated. It was demonstated directly that Cl - ion in solution immigrated toward, then adsorbed preferentially and accumulated at the junction between …
Discussion On Factors Of Unstable 304 Stainless Steel Stress Corrosion Cracking, Xin-Sheng Zhang, Chun-Chun Xu, Gang Hu
Discussion On Factors Of Unstable 304 Stainless Steel Stress Corrosion Cracking, Xin-Sheng Zhang, Chun-Chun Xu, Gang Hu
Journal of Electrochemistry
The 304 stainless steels were stretched at low temperatures to get different martensite phase transformation.Ferrmagnetometer was used to measure the martensite phase content. It was found that the dislocation density of 304 stainless sted was increased unavoidably with increase of deformation.Transmission electron microscope (TEM) was used to study the distribution of the dislocation.The influence of microstructure change on SCC of 304 stainless steel was discussed by slow strain rate testing (SSRT) in 42% MgCl 2 boiling solution,metallurgical microscope and scanning electron microscope (SEM).The results showed that martensite phase and dislocation flaw act together on the SCC susceptibility of 304 stainless …