Charge/discharge behavior of electric double-layer capacitors composed of activated carbon fiber cloth (ACFC) electrodes and an organic electrolyte was investigated. The modification of the ACFC electrodes was performed using cold plasma generated in argon-oxygen atmosphere. The effect of the cold plasma treatment of the ACPC electrodes on the capacitor performance was discussed on the basis of the physical and chemical properties of the ACFC surface such as pore radius distribution and surface atom concentration. 相似文献
The body-fixed coordinate system is applied to the wave-body interaction problem of a small-depth elastic structure which has both rigid and elastic body motion... 相似文献
Hydrogen is a promising alternative to fossil fuels that can reduce greenhouse gas emissions. Decoupled water electrolysis system using a reversible proton storage redox mediator, where the oxygen evolution reaction and hydrogen evolution reaction are separated in time and space, is an effective approach to producing hydrogen gas with high purity, high flexibility, and low cost. To realize fast hydrogen production in such a system, a redox mediator capable of releasing protons rapidly is required. Herein, α-MoO3, with an ultrafast proton transfer property that can be explained by a dense hydrogen bond network in the lattice oxygen arrays of HxMoO3, is examined as a high-rate redox mediator for fast hydrogen production in acidic electrolytes. The α-MoO3 redox mediator shows both a large capacity of 204 mAh g−1 and fast hydrogen production at a current rate of 10 A cm−2(≈153 A g−1), outperforming most of the previously reported solid-state redox mediators. 相似文献
In Japan, structural control is widely recognized as a fundamental technology for exceeding the performance limitations of conventional earthquake/wind‐resistant buildings. Over the last three decades, research and development (R & D) has been implemented in construction, mechanical industries, and universities. Additionally, many types of control strategies have been proposed through theoretical, experimental, and numerical investigations. In comparison with other countries, Japan has successfully and rapidly developed remarkable engineering applications for actual buildings using advanced structural control technologies, because Japanese construction companies promote R & D in cooperation with mechanical industries, structural design offices, and universities. This review paper introduces the recent structural control advances in Japan. The state‐of‐the‐art report is based on papers published by the Architectural Institute of Japan, the Proceedings of the 16th World Conference on Earthquake Engineering, articles published in a structural engineering magazine, the special theme sessions at the 7th World Conference on Structural Control and Monitoring, and other relevant information. The key research directions are the simplification of control laws and mechanical devices, high performance with either little or no energy supply, device magnification, use of structural frames and substructures, new materials, adaptability, and cautious uses serving various purposes. 相似文献
The Sosokan building of Keio University located in Yokohama, Japan, is a base‐isolated building with a semi‐active control system. The semi‐active dampers’ damping coefficient is changed to best reproduce the optimal control force in linear‐quadratic‐gaussian control. However, the implemented control gain was calculated on the basis of the structural parameters applied at the design stage. In this study, we identified the building's actual structural parameters using observational records from the 2011 Tohoku earthquake. Using the updated structural model and 1000 simulated ground motions, we conducted a dynamic response analysis, which resulted in a fragility curve. Then, we evaluated the damage probability using the fragility curve and a seismic hazard curve. Finally, we determined the optimal control parameters to minimize the damage probability and used these parameters to implement the semi‐active control system. 相似文献
We have been studying on estimating distribution of permittivity between measurement electrodes using capacitance and electric potential. Two arc electrodes were separated by long distance and there electrodes were surrounded by additional electrodes respectively. In past research work, we carried out numerical electric analysis for calculating the capacitance and electric potential using Finite Element Method (FEM) and compared with experimental and numerical results. The capacitance values were almost agreed with experimental and numerical results. However, the electric potential values were different between experimental and numerical results in conventional studies. In this paper, we proposed an equivalent circuit including the stray capacity and measurement method for capacitance, the electric potential in space between long distance electrodes was estimated. 相似文献
A transient linear response to a phase modulating field is studied for a two-level system which is placed under the influence of a surrounding environment. Both initial correlation and detuning between a two-level system and environment are taken into account. An exact expression of the transient linear response function is derived when the whole system contains no more than single excitation. If the reduced time evolution is non-Markovian, the transient response strongly depends on initial correlation, detuning and initial coherence. The detuning and initial coherence are more important than the initial correlation in the transversal response while the detuning and the initial correlation become significant in the longitudinal response. In particular, it is found that the longitudinal response is greatly enhanced and its decay becomes sufficiently slow under certain conditions. 相似文献
AbstractPatients with gait disorders often use bilateral crutches along with their own two legs. It is a kind of quadrupedalism. Crutch-assisted gait is usually described and evaluated qualitatively. In this study, we developed a system to quantify the spatial and temporal parameters for crutch-assisted quadrupedalism. Our system consists of walkway hardware and our originally developed software. We specifically extended the measurable area to 1200 mm × 4800 mm, large enough to measure crutch gait. Using our system, we could describe crutch gait precisely. Our system has a capability to evaluate differences between patients and changes within a patient. 相似文献
In the presence of a catalytic amount of cobalt(II) acetylacetonate/Xantphos in combination with trimethylaluminum, various ketoalkenes underwent an intramolecular cyclization reaction triggered by cleavage of the allylic C(sp3)−H bond, affording carbocyclic compounds with high regio‐ and diastereoselectivity. Mono‐, bi‐, and tricarbocyclic compounds were produced in good yields. One of the products thus obtained was derivatized into tramadol in four simple steps. Notably, these intramolecular cyclizations took place in the absence of a gem‐disubstituent on the tethered carbon chain (without the Thorpe‐Ingold effect).
