摘要：The advancement of a Z-scheme photoelectrochemical(PEC)system for hydrogen production and watersplitting holds significant promise in addressing the escalatingglobal energy *** this study,a ternary Co-ZnCdS-BiFeO_(3)Z-scheme composite photocatalyst was *** optimizingthe ratio of BiFeO_(3)/ZnCdS,the photocatalytic activity of thematerial is enhanced,while enhancing the electron transferefficiency and strengthening the stability of the *** Co(dmgBF2)_(2)(H_(2)O)_(2)was selected as the co-catalystto further improve the electron-hole separation efficiencyand photocorrosion *** visible light irradiation,the hydrogen production rate of the PEC system can reach4.03 mmol g^(-1)h^(-1).Under optimal conditions,applying a biasvoltage of−0.1 V *** can produce−38.5μA cm^(−2).Thephotocatalytic current density of is as high as 13 times that ofpure ZnCdS,greatly improving the hydrogen production efficiency and stability of the *** study offers anovel benchmark for the development of a high efficiency Zscheme photocatalyst designed for water splitting and provides new insights into intrinsic resistance through PEC analyses.

摘要：To investigate the fan performance of air conditioning system, two different configuration fan test systems are designed. All scale simulation of the two systems provide the basis for design and improvement of air conditioning system fans to improve the internal flow, increase air volume, and reduce the noise. The conclusion that disturbance on flow of nuzzle outlet is the main sources of measurement error about 5% can be proved by the comparative analysis of the results between computation and experiment. Through Optimization Design of Partial Structure they all meet the industry standard, measurement error less than 1.5%.

摘要：Disposal of the pollutants arising from farming cattle and other livestock threatens the environment and public safety in diverse ***,we report on the synthesis of engineered biochars using cow dung as raw material,and investigating these biochars as antibacterial agents for water *** coating the biochars with N-halamine polymer and loading them with active chlorine (i.e.,Cl+),we were able to regulate them on demand by tuning the polymer coating and bleaching *** obtained N-halamine-modified biochars were found to be extremely potent against Escherichia coli and Staphylococcus *** also investigated the possibility of using these N-halamine-modified biochars for bacterial decontamination in real-world *** findings indicated that a homemade filter column packed with N-halamine-modified biochars removed pathogenic bacteria from mining sewage,dairy sewage,domestic sewage,and artificial *** proposed strategy could indicate a new way for utilizing livestock pollutants to create on-demand decontaminants.

摘要：动态治疗方案(Dynamic treatment regimens,DTRs)是一种序贯决策规则,是根据每个患者随时间变化而变化的特征和先前观察到的中间结果而量身定制的临床决策。精神障碍具有慢性和复杂性的特点,精神障碍患者具有异质性特点。这就要求随时间推移,根据个体对治疗反应的不同而分析出最佳的治疗方案,并动态地应用到患者之后的治疗中。多重方案随机序贯试验(Sequential Multiple Assignment Randomized Trial,SMARTs)的设计可以估计DTRs的治疗效应。SMARTs收集到大量的个体化变量和中间结果,在此基础上应用已有的现代统计工具可以优化DTRs。这些统计方法也可为今后的SMARTs研究设计推荐量身定制的变量。本文通过两个精神卫生研究案例介绍了DTRs和SMARTs,讨论了从SMARTs数据估算出最佳DTR的两种不同的计算机自动分析方法,并使用模拟数据演示这两种统计方法的性能。

摘要：While many techniques have been developed for the design of different types of antennas,such as wire antenna,patch antenna,lenses,and reflectors,these cannot be said general-purpose strategies for the synthesis and design of antennas to achieve the performance characteristics specified by ***,there has been an increasing need for the development of antenna design techniques because of the advent of 5 G and a variety of space,defense,biological,and similar applications,for which a robust and general-purpose design tool is not to be *** main objective of this study is to take a look at antenna design from the field manipulation point of view,which has the potential to partially fulfill this *** review the existing field manipulation techniques,including field transformation methods based on Maxwell’s and wave equations,point out some limitations of these techniques,and then present ways to improve the performance of these ***,we introduce an alternative approach for field manipulation based on two-dimensional(2 D)metasurfaces,and present laws of the generalized reflection and refraction that are based on 2 D surface ***,we explore how to overcome the limitations of conventional reflection and refraction processes that are strictly bounded by the critical ***,we provide some application examples of field manipulation methods in the antenna design,with a view on developing a general-purpose strategy for antenna design for future communication.

摘要：A heterogeneous wireless sensor network comprises a number of inexpensive energy constrained wireless sensor nodes which collect data from the sensing environment and transmit them toward the improved cluster head in a coordinated way. Employing clustering techniques in such networks can achieve balanced energy consumption of member nodes and prolong the network *** classical clustering techniques, clustering and in-cluster data routes are usually separated into independent operations. Although separate considerations of these two issues simplify the system design, it is often the non-optimal lifetime expectancy for wireless sensor networks. This paper proposes an integral framework that integrates these two correlated items in an interactive entirety. For that,we develop the clustering problems using nonlinear programming. Evolution process of clustering is provided in simulations. Results show that our joint-design proposal reaches the near optimal match between member nodes and cluster heads.

摘要：大规模通信系统的发展对传统滤波器设计提出了更高的要求,稀疏有限脉冲响应(FIR)滤波器具有低计算复杂度与低实现成本的特点,但常规凸松弛近似设计方法会产生额外的逼近误差,稀疏性也不理想,并且求解过程复杂。针对FIR滤波器在设计中由于乘法器个数多而导致实现成本高的问题,该文提出了一种基于加权最小二乘准则的稀疏FIR滤波器设计方法。首先,根据不同范数性质对初始稀疏表示的L0范数进行替换,即对目标函数进行改进,从而在保持稀疏性的基础上,解决非凸函数难以直接求解的问题;然后,将目标问题转化为2个凸子问题差的形式,根据迭代规则构造形式更为简单的子问题,采用交替求解方法求解子问题,以进一步提高求解效率并降低求解复杂度;最后,在确定0系数的位置后,通过求解一个加权最小二乘问题来进一步减小近似误差。仿真实验结果显示:与已有的稀疏滤波器求解方法相比,所提方法能够提高FIR滤波器的系数稀疏性,降低乘法器个数,并且在稀疏性增强的情况下获得较为折中的均方根误差与最大误差,同时计算机求解时间更少,求解效率更高。

摘要：The development of metal sulfide catalysts with remarkable activity toward efficient overall photocatalytic water splitting remains challenging owing to the dominant charge recombination and deficient catalytic active ***,in the process of water oxidation catalysis,the inhibition of severe photocorrosion is an immense task,requiring effective photogenic hole-transfer ***,stratified Co-MnO_(2)@CdS/CoS hollow cubes with spatially separated catalytic sites were rationally designed and fabricated as highly efficient controllable catalysts for photocatalytic overall water *** unique self-templated method,including a continuous anion/cation-exchange reaction,integrates a Co-doped oxidation co-catalyst(Co-MnO_(2))and a reduction co-catalyst(CoS)on the nanocubes with uniform interface contact and ultrathin two-dimensional(2D)nanometer *** demonstrate that the stratified Co-MnO_(2)@CdS/CoS hollow cubes can provide an abundance of active sites for surface redox reactions and contribute to the separation and migration of the photoionization charge *** particular,CoS nanoparticles dispersed on the walls of CdS hollow cubes were identified as reduction co-catalysts accelerating hydrogen generation,while Co-MnO_(2) nanosheets attached to the inner walls of the CdS hollow cube were oxidation co-catalysts,promoting oxygen evolution *** from the desirable structural and compositional advantages,optimized stratification of Co-MnO_(2)@CdS/CoS nanocubes provided a catalytic system devoid of precious metals,which exhibited a remarkable overall photocatalytic water-splitting rate(735.4(H_(2))and 361.1(O_(2))μmol h^(−1) g^(−1)),being among the highest values reported thus far for CdS-based ***,an apparent quantum efficiency(AQE)of 1.32%was achieved for hydrogen evolution at 420 *** study emphasizes the importance of rational design on the structure and composition of photocatalysts for overall water splittin

摘要：Biomedical metals are widely used as implant materials in the human or animal body to repair organs and restore function, such as heart valves, meninges, peritoneum and artificial *** element affects the microstructure, mechanical property, corrosion resistance and wear resistance, but also influences the antibacterial and biological ***, antibacterial metal alloys have shown great potential as a new kind of biomedical materials, in which Cu has been widely used as antibacterial agent *** addition, biodegradable metal alloys, including magnesium alloy and zinc alloy, also have attracted much attention *** was also used as alloying element to adjust the degradation ***, the role of Cu in the alloy design will be very important for the development of new *** this paper, we summarized the recent research results on the Cu-containing metal alloy for biomedical application and hoped that this review would give more suggestions for the further development of biomedical metal alloy.

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