Acidic oxygen evolution reaction (OER) is a major limitation of practical hydrogen production from water electrolysis. Here, we developed an interfacial electron modulation strategy on the basis Ir-Co3O4 hybrids to build anomaly OH-rich catalyst-electrolyte layer for efficient OER. Our theoretical studies predict that accumulation preferentially occurs O near Ir sites, which confirmed via X-ray based and advanced microscopy characterization. The accumulated density up 20.0 e/Å2 according...

Abstract In order to facilitate the analysis and processing of optical signals, an FPGA-based CCD signal acquisition data transmission system is designed in this work. The uses FPGA as main control device, TCD1304DG/AP chip detector, CYUSB3KIT-003 development board product by Cypress for transmission. Verilog Python languages are employed modular design on-board verification. Through coordination each module, successfully achieves

Linearized unsteady-lifting-surface theory has been applied in the study of counterrotating propeller systems with equal or unequal number blades operating uniform nonuniform inflow fields when both units are rotating same rpm. The mathematical model takes into account as realistically possible geometry propulsive device, mutual interaction and three-dimensional spatially varying field. lie on a helicoidal surface pitch, have finite thickness arbitrary planform, camber sweep angle. field...

The reinforced concrete arch bridge with concrete-filled steel tubular stiffened skeleton is extensively used in the mountainous area of southwest China due to their long span and high stability. Beibanjiang Bridge located Shanghai- Kunming high-speed railway, which had a record 445 m, has recently been completed 2016. However, creep shrinkage have pronounced effects on long-term deflection stress redistribution this bridge. Several specimens natural environment were made predict behaviour...

The heating mechanism of the capacitor is researched, air cooling structure designed capacitors, model capacitors established for phenomenon occurs during charging and discharging process super in series hybrid electric vehicle. simulated based on software Star CCM +. results experiment show that maximum temperature difference less than 5°C among which ensures consistency working proves work substantially well.

New bounds for the Perron root ρ(A) of a positive matrix A are proposed. Let R1≥R2≥⋯≥Rn be row sums listed in descending order. We use pairwise combination method to prove that min1≤k≤j{(1−t)Rk+tRn−k+1}≤ρ(A)≤max1≤k≤j{tRk+(1−t)Rn−k+1},with j=⌈n/2⌉, t=M/(M+m), and M (respectively m) is maximum (resp. minimum) entry A. This result improves well-known Rn≤ρ(A)≤R1, same can also used improve several other known bounds.

In recent years, various welded details with complex local structure, ambiguous fatigue performance have appeared in fully steel truss bridges, however, they are not covered the current design specifications. order to study of revised cope-hole details, experiments were designed and carried out on three specimens detail same dimensions but subjected different stress amplitude. Local finite element model was established for further analysis. The results analysis basically consistent static...

Membranes are made by doping and modifying the Nafion117 with Nano-silica(SiO2). The penetration proton conductivity of composite membrane studied through gas chromatograph electrochemical workstation. With help cross-section spectrum, it shows that SiO2 particles can penetrate internal weight percentage is greater than 0.1% after membranes Nafion117, so has a very good combination substrate. which handled Sol on 60°C high water retention performance in temperature. permeability coefficient...

This paper continues the previous study on clarifying time-dependent behaviour of Beipanjiang Bridge ‒ a reinforced concrete arch bridge with concrete-filled steel tubular stiffened skeleton. The obtained prediction models and Finite Element Models were used to simulate long-term stress redistribution bridge. Three-dimensional beam elements simulated skeleton surrounding concrete. Then, parameters was carried out analyse influenced by different creep shrinkage models. simulation results...

Geological disasters as earthquake, often accompanied with the landslide collapse. Although earthquake is unpredictable, while relief can be most optimal. The area, due to lead instability of rock and soil mass, rescue route blocked. Time equals life, how choose a best way rescue, extremely important. manuscript kind measure determine based on fuzzy analytic hierarchy process (AHP), mainly aimed at geological disaster involving mass under seismic action traffic jams, establishing route....

In this paper, we get a lower bound of the smallest singular value an arbitrarily matrix A by trace H(A) and Euclidean norm H(A), where is Hermitian part A, numerical examples show e ectiveness our results.

Floating production, storage and offloading systems (FPSOs) have been widely used in the development of offshore oil gas fields because their many attractive features. These features include a large work area capacity, mobility (if desired), relatively low construction cost good stability. They are mostly ship shaped, either converted from existing tankers or purpose built. The hull structural scantling design for may be applicable to FPSOs; however, FPSOs own unique characteristics. located...

The fatigue performance of optimized welded detail has been investigated by experiments three specimens under different loadings. In addition, local finite element models this were established using software ANSYS. influences factors such as plate thickness, gap and initial geometric imperfections on the stress concentration coefficient (SCC) discussed. experimental results indicate that life for is 736,000, 1,044,200 1,920,300 times, respectively. web filler thickness imperfection have...

To study modeling calculation methods of new girder structure detail's hot spot stress, based on surface extrapolation method among stress method, a few finite element analysis models this welded detail were established by software ANSYS. The influence type, mesh density, different local the weld toe and was analyzed results at welds. show that difference normal in thickness direction is larger when distance from smaller. When greater than 0.5t, solid models, shell with welds non-weld tends...

Cope-hole details are widely applied to steel bridges. However, the safety of bridges is influenced by fatigue performance welded details. So, cope-hole with flange and web subjected axial loads were selected as research object. Based on basic theory linear elastic fracture mechanics Finite Element Method, stress intensity factors cope-holes calculated. The influences geometry size crack detail then investigated. Paris model propagation predicted life Besides, limit-state equation was also...

Some bounds for the Perron root $\rho$ of positive matrices are proposed. We proved that$$\max_{1\leq i \leq n}{\bigg(\sum_{k}{a_{ik}m_{ki}} \bigg)} \rho \min_{1\leq n}{\bigg(\sum_{k}{a_{ik}M_{ki}} \bigg)}.$$where $$m_{ki}=\min_{t}{\frac {(\alpha_k,\beta_t)}{(\alpha_i,\beta_t)}}, M_{ki}=\max_{t}{\frac {(\alpha_k,\beta_t)}{(\alpha_i,\beta_t)}}$$and $\alpha_k$ denotes $k$-th row matrix $A$, $\beta_t$ $t$-th column $(\alpha_k,\beta_t)$ inner product and $\beta_t$.And these can also be used to...

The object is dismantling machine shear head with 500kN’s maximum force. three-dimensional models, static analysis, topology optimization were done in the ANSYS Workbench. And goal driven was which based on optimization. total deformation, equivalent stress and geometry mass selected as objective parameters distance of two connecting holes, diameter long hole length blade design variables. At last, optimized structure checked. strength rigidity meet requirements decreased.

In order to reduce the costs and improve performances, conceptual design was proposed for a novel direct methanol fuel cells (DMFCs), named "1#DMFCs", whose outside size shape were ascertained by common 1 <sup xmlns:mml="http://www.w3.org/1998/Math/MathML" xmlns:xlink="http://www.w3.org/1999/xlink">#</sup> batteries. All basic parameters gained from experiment datum. Inside dimension structure determined calculating, admeasuring devising elaborately. Three-dimensional model devised through...

The principle and characteristics of Fault-tolerant Permanent Magnet Synchronous Linear Motor are introduced. design or computational method the polar distance concentrated winding coil, armature parameters, coil diameter, from adjacent windings given. magnetic thrust equation is derived, core issues analyzed. It provided theoretical basis for structural optimization Motor.