摘要：A solution cooling absorption（SCA）approach is proposed to modify the aqueous ammonia absorption refrigerat-ion cycle using the strong solution from the absorber to cool the forepart of the absorption in the cycle for reclaiming some portion of absorption *** a consequence of raised temperature at the inlet,the strong solution partially boils at the outlet of the solution heat exchanger,and diminishes the thermal heat consumption of the heat *** calculation results show that the coefficient of performance（COP）of this modified cycle is about 28.3% higher than that of the traditional cycle under typical conditions;while the required heat transfer area of the total heat exchangers of the cycle is somewhat less than that of the traditional *** capacity of refrigeration with the new absorption cycle is more than doubled in contrast to the adsorption scheme with an identical *** is sufficient to supply a fishing boat the chilling capacity for preservation of fishing products with the modified cycle chiller driven by its diesel engine exhaust.

摘要：为研究和设计面向第三方场景的高效盲检方法,提出了一种基于Polar译码度量选择的第三方高效PdCCH盲检方法,其技术路线包括Polar译码算法与物理的下行控制信道(PdCCH)盲检算法2个板块.基于Polar译码盲检算法,引入一种基于下行控制信息(dCI)长度的Polar译码度量,提出了改进的基于Polar译码度量选择的第三方盲检方法.基于PdCCH盲检算法,引入一种重排序盲检算法.将改进的Polar译码算法与重排序盲检算法有机结合,提出面向第三方场景的高效PdCCH盲检方法.基于MATLAB平台搭建5G PdCCH盲检仿真链路,对所提方法进行验证与分析.结果表明,该方法能够同时有效减小PdCCH盲检次数与dCI候选长度数量,在保证目标捕获准确率的前提下提高盲检效率.

摘要：The flow stress behavior and microstructure development of Al-5Zn-2Mg （7005） aluminum alloy were studied by hot compression tests at deformation temperatures between 300-500 ＆#176;C and strain rates between 0.05-50 s-1. The deformed structures of the samples were observed by optical microscopy （OM）, transmission electron microscopy （TEM） and electron backscattering diffraction （EBSd） analysis. The calculated activation energy is 147 kJ/mol, which is very close to the activation energy for lattice self-diffusion in aluminum （142 kJ/mol）. dynamic recovery is the dominant restoration mechanism during the deformation. At high strain rate of 50 s-1, temperature rise due to deformation heating leads to a significant flow softening. Microstructure observations indicated that the remaining softening after deformation heating correction at high strain rate and the softening observed at high temperature are associated with grain coarsening induced by grain boundary migration during dynamic recovery process.

摘要：介绍利用计算机软件进行适宜银川气候的建筑设计方法,以图表的形式分析当地的气候数据并明确得到适应银川气候特点的建筑设计策略.气候分析图和被动设计策略对建筑师在草图设计阶段具有指导意义.

摘要：To further improve the utilization efficiency of solar energy and the performance of solar heat pump heating systems,a new heating mode of a solar air-source heat pump（SASHP）is proposed,and the characteristics and performance of the heat pump part of this new heating system are *** on a SASHP with 10 kW,the mathematical model of this system is built,and the characteristics and performance are concluded from the simulation analysis at different environmental temperatures and output water *** results show that the performance of heat pumps can be greatly improved based on the new *** the environmental temperature is 7 ℃,the coefficient of performance（COP）of the air-source heat pump（ASHP）can be increased by 26% at *** paper sets up a base for further study on the heating system with this new SASHP in the heating season.

摘要：Flexible wearable sensors with excellent electric response and self-powered capability have become an appealing hotspot for personal healthcare and human-machine ***,based on triboelectric nanogenerator(TENG),a flexible self-powered tactile sensor composed of micro-frustum-arrays-structured polydimethylsiloxane(PdMS)film/copper(Cu)electrodes,and poly(vinylidenefluoride-trifluoroethylene)(P(VdF-TrFE))nanofibers has been *** TENG-based self-powered tactile sensor can generate electrical signals through the contact-separation process of two triboelectric layers under external mechanical *** to the uniform and controllable micro-frustum-arrays structure fabricated by micro-electro-mechanical system(MEMS)process and the P(VdF-TrFE)nanofibers fabricated by electrostatic spinning,the flexible PdMS-based sensor presents high sensitivity of 2.97 V kPa^-1,stability of 40,000 cycles(no significant decay),response time of 60 ms at 1 Hz,low detection pressure of a water drop(~4 Pa,35 mg)and good linearity of 0.99231 in low pressure *** the PdMS film presents ultra-flexibility and excellent-biocompatibility,the sensor can be comfortably attached on human ***,the tactile sensor can recognize various types of human body movements by the corresponding electrical ***,the as-prepared TENGs are potential on the prospects of gesture detection,health assessment,human-machine interfaces and so on.

摘要：Organic electrode materials(OEMs)have attracted significant attention for use in aqueous zinc-ion batteries(AZIBs)because of their abundant resources and flexible ***,the development of high-performance OEMs is strongly hindered by their high solubility,poor conductivity,sluggish ion diffusion kinetics,and difficult coordination toward Zn^(2+).Herein,inspired by fabric crafts,we have designed a robust polymer fabric through the iterative evolution of the building blocks from point to line and *** evolution from point to line could not only improve the structural stability and electrical conductivity but also adjust the active site arrangement to enable the storage of Zn^(2+).In addition to further boosting the aforementioned properties,the evolution from line to plane could also facilitate the construction of noninterference channels for ion ***,the poly(1,4,5,8-naphthalenete tracarboxylic dianhydride/2,3,5,6-tetraaminocyclohexa-2,5-diene-1,4-dione)(PNT)polymer fabric has the most enhanced structural stability,optimized active site arrangement,improved electrical conductivity,and suitable ion channels,resulting in a record-high capacity retention of 96%at a high mass loading of 56.9 mg cm-2and a stable cycle life of more than 20,000 cycles at 150 C(1 C=200 mA g^(-1))in *** addition,PNT exhibits universality for a wide range of ions in organic electrolyte systems,such as Li/Na/K-ion *** iterative design of polymer fabric cathode has laid the foundation for the development of advanced OEMs to promote the performance of metal-ion batteries.

摘要：In order to decrease vehicle crashes, a new rear view vehicle detection system based on monocular vision is designed. First, a small and flexible hardware platform based on a dM642 digtal signal processor （dSP） micro-controller is built. Then, a two-step vehicle detection algorithm is proposed. In the first step, a fast vehicle edge and symmetry fusion algorithm is used and a low threshold is set so that all the possible vehicles have a nearly 100% detection rate （TP） and the non-vehicles have a high false detection rate （FP）, i. e., all the possible vehicles can be obtained. In the second step, a classifier using a probabilistic neural network （PNN） which is based on multiple scales and an orientation Gabor feature is trained to classify the possible vehicles and eliminate the false detected vehicles from the candidate vehicles generated in the first step. Experimental results demonstrate that the proposed system maintains a high detection rate and a low false detection rate under different road, weather and lighting conditions.

摘要：The pursuit of high-mileage models results in the recurrence of lithium metal batteries(LMBs)to researchers’***,the lithium(Li)metal anode for LMBs undergoes the uncontrollable formation of Li dendrites and infinite volume change during cycling,impeding its practical *** overcome these challenges,we developed a metal-organic framework(MOF)-derived pathway to construct lithiophilic three-dimensional(3d)skeleton using different substrates(e.g.,carbon cloth(CC)and Cu mesh)for dendrite-free lithium metal *** a typical example,the MOF-derived ZnO/nitrogen-doped carbon(NC)nanosheet-modified 3d CC was well-constructed as a lithiophilic hierarchical host(CC@ZnO/NC@Li)for molten Li *** from the lithiophilic N-functional groups and LiZn alloy,the synthesized CC@ZnO/NC@Li composite anode promoted the uniform distribution of Li,resulting in a dendrite-free ***,the 3d conductive carbon skeleton enhanced the reaction kinetics and buffered the volume change of the *** CC@ZnO/NC@Li composite anode presented a prolonged lifespan of over 1000 cycles at 5 mA cm^(−2) with a low overpotential of 19 *** with a LiFePO_(4) cathode,the CC@ZnO/NC@Li composite anode also exhibited superior electrochemical properties in the full-cell *** versatile strategy may open up the channel of designing multi-functional lithiophilic 3d hosts for the Li metal anode.

摘要：The dynamic recrystallization （drX） process of AZ31 magnesium alloy including microstructure and dislocation density evolution during hot compression was simulated by adopting the cellular automaton （CA） method coupling the Laasraoui-Jonas model （LJ model）. The reliability of simulation depended on the accuracy of the hardening parameter, the recovery parameter and the strain rate sensitivity in the LJ model. The hardening parameter was calculated in terms of the LJ model and the Kocks-Mecking model （KM model）, and then the recovery parameter and the strain rate sensitivity were obtained by using the equation of steady state flow stress for drX. Good agreements between the simulations and the experimental observations were achieved.