摘要：The alloying behavior and microstructures of the(CoCrFeNiMn)_(90)M_(10)(M=Al,Hf)high-entropy alloy(HEA)powders fabricated by mechanical alloying were *** CoCrFeNiMn)_(90)Al_(10) powders have duplex solid-solution *** contrast,nanocrystalline HfNi_(3) anchoring in amorphous structures is found in the(CoCrFeNiMn)_(90)Hf_(10) ***(CoCrFeNiMn)_(90)Al_(10) powders show better ferromagnetic behaviors,mainly explained by the facilitated motion of the magnetic domain induced by the coherent interface between duplex *** with our previous work,the rules of forming solid-solution and amorphous phase in as-milled HEA powders are preliminarily *** is found that,compared with the as-cast HEA reported previously,the variation range of mixing enthalpy with atomic size difference of the solid-solution formed in as-milled HEA powders is ***,the variation ranges between mixing enthalpy and entropy with atomic size difference of the amorphous phase in HEA powder become wider than those of high-entropy bulk metallic glass.

摘要：Photoelectrochemical(PEC)hydrogen production is of great interest as an ideal avenue towards clean and renewable ***,the instability and low energy conversion efficiency of photoanodes hinder their practical *** we address these issues by introducing a hole extraction layer(HEL)which could rapidly transfer and consume photogenerated *** HEL is constructed by reduced graphene oxide(RGO)and other cocatalysts that enable rapid transfer and subsequent consumption of holes,***,we showcase a high-stability photoanode composed of CdSeTe nanowires(CST NWs)and RGO/PdS nanoparticles(PdS NPs)based *** photoanode achieves excellent photocorrosion resistance,which allows stable hydrogen evolution for>2 h at 0.5 VRHE.

摘要：作为一种复杂的工业系统,离心压缩机具有强耦合、强非线性、大滞后的特点。由于控制参数较多,且参数之间相互影响、关系复杂,加之其控制优化需要综合考虑输出性能、整机效率、可靠性等因素,离心压缩机调控的难度非常大。本文提出了一种融合仿真模型与深度强化学习的离心压缩机控制优化方法,对避免流体机械工作点漂移、提高系统可靠性、降低能耗具有一定的意义。首先,分析离心压缩机典型结构,建立离心压缩机Greitzer仿真模型。然后,根据流体机械性能优化需求,设计优化评价指标,提出基于异步优势演员-评论家(A3C)深度强化学习的智能控制优化方法。最后,通过气动试验台实验验证了方法在压缩机系统中的应用效果。

摘要：Four Simmental steers （average BW 500 kg, aged 3.5） cannulated at the rumen consuming a corn stover diet were used in a 4×4 Latin square design and supplemented with calcium propionate （0, 100, 200 and 300 g/d） to evaluate the effects of calcium propionate on ruminal degradability of corn stover. The results showed that DM effective degradability of corn stover in group supplemented calcium propionate at 200 g/d tended to be higher than control group, but no significant difference （P〉0.05）. OM, NDF and ADF effective degradabilities of corn stover in group supplemented calcium propionate at 200 g/d were higher than control group （P〈0.05）, but no significant difference among other group （P〉0.05）. The optimum calcium propionate supplemented dose was 200 g/d.

摘要：全面介绍了钢结构框架体系非线性分析方法的研究现状及发展趋势 ,讨论了影响结构整体极限承载力的各种非线性因素及其考虑方法 。

摘要：简述了火箭基组合循环 (RBCC)推进系统及相应概念设计模型的发展与不足 ,并应用准一维流动理论及化学反应动力学理论建立了RBCC一维性能预估数学模型。该模型耦合了有限化学反应速率模型 ,考虑了包括变几何截面积、引射流动、燃料喷注、混合、燃烧及摩擦损失等多种影响流动的因素 ,并采用变步长半隐式多步龙格 库塔方法进行了数值求解。

摘要：针对三相三电平VIENNA整流器在d-q坐标系下强耦合,非线性的特点,以及控制器参数设计困难等问题,提出前馈解耦控制策略实现对d、q轴的解耦控制。同时利用MATLAB单输入-单输出(Single input—Single output,SISO)设计工具,详细分析内外环控制器零点位置及环路增益对系统性能的影响,并依据系统性能指标,确定内外环控制器参数。针对直流侧电容中点电位波动的问题,利用正负小矢量的相反作用,通过调节系数抑制中点电位波动。最后在MATLAB/SIMULINK软件中搭建仿真平台,验证所提出控制策略和参数设计的正确性,使VIENNA整流器具备良好的动,静态特性,保持单位功率因数运行和有效的电流谐波抑制。

摘要：设计了一款抗辐射16位25 MS/s流水线型模数转换器(ADC)。根据电容失配等因素确定了第一级4位的流水线结构,并设计了改进的自举开关来提高采样线性度。为了降低系统功耗,设计了一种开关电容动态偏置电路,通过减小放大器的平均电流来降低ADC的系统功耗。为了满足抗辐射的要求,针对电离总剂量效应和单粒子闩锁效应的机理,对电路进行抗辐射加固设计。该款抗辐射ADC在0.18μm CMOS工艺上进行制造,转换器的芯片面积为2.5 mm^(2),经过辐射试验后,在采样率25 MHz、1.8 V电源电压和30.1 MHz正弦输入的条件下,ADC的信噪比(SNR)达到了76.7 dBFS,无杂散动态范围(SFDR)为95.1 dBFS,功耗为38.76 mW,抗辐射能力达到电离总剂量100 Krad(Si)和单粒子闩锁阈值75 MeV·cm^(2)/mg,可满足空间环境的使用要求。

摘要：通常情况下互通式立交与服务区合建是由于受地形、地物限制导致立交、服务区布设空间不足或间距不满足规范要求而被迫采用的设计方案,提出一种新型的互通式立交与服务区的合建方案,适用于需要打造交旅融合式服务区而采用的服务区与互通合建方案。

摘要：对于配置可调螺距螺旋桨的船舶,螺旋桨的推进特性同常规定螺距螺旋桨船舶有较大差异,ISO15016标准中对于配置可调螺距螺旋桨的船舶EEDI测速仅有少量描述,缺乏测速流程及修正方法。文中从螺旋桨推进本质角度分析可调螺旋桨的推进特性,介绍了常规推进船舶EEDI的校核流程,通过对配置可调螺旋桨的船舶可能出现的几种试航EEDI测速情况进行分析,提出较为可行的EEDI测速分析方法,以期为相关船型设计、试验及标准完善提供一定的依据。