摘要：Noble metal-reducible oxide interfaces have been regarded as one of the most active sites for water-gas shift ***,the molecular reaction mechanism of water-gas shift reaction at these interfaces still remains ***,water-gas shift reaction at Pt-NiO interfaces has been in-situ explored using surface-enhanced Raman spectroscopy by construction of Au@Pt@NiO *** Raman spectroscopic evidence demonstrates that water-gas shift reaction at Pt-NiO interfaces proceeds via an associative mechanism with the carbonate species as a key *** carbonate species is generated through the reaction of adsorbed CO with gaseous water,and its decomposition is a slow step in water-gas shift ***,the Pt-NiO interfaces would promote the formation of this carbonate intermediate,thus leading to a higher activity compared with pure *** spectral information deepens the fundamental understanding of the reaction mechanism of water-gas shift reaction,which would promote the design of more efficient catalysts.

摘要：采用紫外可见分光光度法测定火炭母(Polygonum chinense L.)中总黄酮的含量,以总黄酮含量为考察指标,以提取方式、提取溶剂、料液比、提取时间、提取次数为考察因素,在单因素试验的基础上,采用L9(33)正交设计优化火炭母中总黄酮的提取工艺。最优提取工艺:70%乙醇为提取溶剂,料液比1∶70(m/V),超声波提取45 min,提取2次。以芦丁为对照品,在500 nm波长处测定其吸光度,平均加样回收率为98.76%,相对标准偏差为1.72%。结果表明,13个产地火炭母药材的总黄酮含量为22.205 4~52.173 7 mg/g,相对标准偏差(RSD)为1.07%~2.81%。13个产地总黄酮含量由高到低依次为桂林市、南宁市、玉林市、百色市、贺州市、河池市、贵港市、防城港市、钦州市、梧州市、来宾市、崇左市、柳州市。该方法精密度、稳定性、重复性良好,可作为广西产火炭母药材质量评价的依据。

摘要：近年来我国枸杞产业快速发展,由于农机与农艺不能有效结合,人工枸杞采收作业仍是枸杞生产全过程中最重要的环节,如何高效采收依旧是枸杞行业可持续发展的关键问题。课题利用Jack人因工程软件,主要分析杞农常用的人工采收方式,分析杞农采收过程中常用姿势的疲劳特性,进行评判分析。结合枸杞采摘特点,以人因工程为研究基础,通过定性分析与定量分析相结合的分析方法,以枸杞采摘作业姿势为研究内容,Jack模拟仿真软件为研究工具,分析不同枸杞采摘作业姿势对人体不同的疲劳特性影响,并给予影响评分,建立枸杞采摘作业疲劳评价体系,根据不同环境、不同姿势、不同状态的综合评分实现劳动姿势疲劳判断,为辅助穿戴式枸杞采摘装置的设计奠定理论基础,提高杞农个体采摘效率,并指导人们安全作业。

摘要：本文研究了全钨ITER朗缪尔探针在高热负荷条件下的耐热性能、绝缘性能和损伤行为。利用核工业西南物理研究院的60 kW电子束测试平台,对探针在10 MW/m^(2)稳态热负荷、20 MW/m^(2)瞬态热负荷及15 MW/m^(2)高参数稳态热负荷下进行模拟测试。实验结果表明,全钨朗缪尔探针能够承受10 MW/m^(2)热负荷100分钟、20 MW/m^(2)热负荷300次循环以及15 MW/m^(2)热负荷3000次循环。在15 MW/m^(2)条件下,探针表面在前1000次循环中无明显损伤,但在3000次循环后出现裂纹,且部分探针表面发生再结晶现象。研究表明,现有全钨朗缪尔探针的设计能够满足当前ITER装置的服役条件,但面对未来DEMO堆更加苛刻的条件可能还需要进一步优化。

摘要：The problems existing in the binary logic system and the advantages of multiple-valued logic (MVL) are introduced. A literal circuit with three-track-output structure is created based on resonant tunneling diodes (RTDs) and it has the most basic memory function. A ternary RTD D flip-flop with pre-set and pre-reset functions is also designed, the key module of which is the RTD literal circuit. Two types of output structure of the ternary RTD D flip-flop are optional: one is three-track and the other is single-track; these two structures can be transformed conveniently by merely adding tri-valued RTD NAND, NOR, and inverter units after the three-track output. The design is verified by simulation. Ternary flip-flop consists of an RTD literal circuit and it not only is easy to understand and implement but also provides a solution for the algebraic interface between the multiple-valued logic and the binary logic. The method can also be used for design of other types of multiple-valued RTD flip-flop circuits.

摘要：An accurate measurement of the refractive index is necessary for the optical design of both deep ultraviolet laser diodes and light-emitting diodes. Generally, the refractive indices along different crystallographic axes of anisotropic thin films are measured using variable angle spectroscopic ***, there are still some limitations concerning this method. Here we proposed a potential method to measure the band edge refractive index of wide bandgap semiconductor. An aperiodic oscillation emission phenomenon due to the Fabry-Perot effect was observed in the fluorescence spectrum of an AlN film with a thickness of 1500 nm. Based on the characteristics of the fluorescence spectrum and the definition of Fabry-Perot effect, we obtained the ordinary refractive index of the AlN thin film near the band edge directly. This refractive index measurement method is a supplement to the variable angle ellipsometry,and it is a more direct and effective method for transferred film and thinner samples to measure the fluorescence spectrum.

摘要：为了降低B_4C的烧结温度,提高B_4C断裂韧性,本文以B_4C、TiO_2、活性炭为原料,采用原位反应法热压烧结制备了TiB_2体积分数为10％的TiB_2/B_4C复合材料。探索了烧结温度对复合材料组织和力学性能的影响规律。结果表明,随烧结温度的提高,复合材料的抗弯强度和断裂韧性先增大后减小,在2050℃时有最大值,分别为544MPa和6.3MPa·m^(1/2),弹性模量和断裂韧性变化不大。随烧结温度的升高,基体和第二相晶粒逐渐长大。采用2050℃/1h/35MPa为最佳烧结工艺。

摘要：The application of multiple UAVs in complicated tasks has been widely explored in recent *** to the advantages of flexibility,cheapness and consistence,the performance of heterogeneous multi-UAVs with proper cooperative task allocation is superior to over the single ***,several constraints should be satisfied to realize the efficient cooperation,such as special time-window,variant equipment,specified execution ***,a proper task allocation in UAVs is the crucial point for the final *** task allocation problem of the heterogeneous UAVs can be formulated as a multi-objective optimization problem coupled with the UAV *** this end,a multi-layer encoding strategy and a constraint scheduling method are designed to handle the critical logical and physical *** addition,four optimization objectives:completion time,target reward,UAV damage,and total range,are introduced to evaluate various allocation ***,to efficiently solve the multi-objective optimization problem,an improved multi-objective quantum-behaved particle swarm optimization(IMOQPSO)algorithm is *** this algorithm,a modified solution evaluation method is designed to guide algorithmic evolution;both the convergence and distribution of particles are considered comprehensively;and boundary solutions which may produce some special allocation plans are ***,adaptive parameter control and mixed update mechanism are also introduced in this ***,both the proposed model and algorithm are verified by simulation experiments.

摘要：Diffraction limited electron storage ring is considered a promising candidate for future light sources,whose main characteristics are higher brilliance,better transverse coherence and better *** challenge of diffraction limited storage ring design is how to achieve the ultra low beam emittance with acceptable nonlinear *** linear and nonlinear parameter optimization methods based on Artificial Intelligence were developed for the storage ring physical *** an example of application,partial physical design of HALS(Hefei Advanced Light Source),which is a diffraction limited VUV and soft X-ray light source,was *** emittance growth due to the Intra Beam Scattering effect,which is the main obstacle to achieve ultra low emittance,was estimated quantitatively and possible cures were *** is inspiring that better performance of diffraction limited storage ring can be achieved in principle with careful parameter optimization.

摘要：In order to simultaneously improve strength and formability,an analytical model for the concentration distribution of precipitates and solute elements is established and used to theoretically design and control the heterogeneous microstructure of Al−Zn−Mg−Cu *** results show that the dissolution of precipitates is mainly affected by particle size and heat treatment temperature,the heterogeneous distribution level of solute elements diffused in the alloy matrix mainly depends on the grain size,while the heat treatment temperature only has an obvious effect on the concentration distribution in the larger grains,and the experimental results of Al−Zn−Mg−Cu alloy are in good agreement with the theoretical model predictions of precipitates and solute element concentration *** the concentration distribution of precipitates and solute elements in Al−Zn−Mg−Cu alloys is the premise of accurately constructing heterogeneous microstructure in micro-domains,which can be used to significantly improve the formability of Al−Zn−Mg−Cu alloys with a heterostructure.