简易光电编码器在冲压机中的应用

叙述了冲压机专用角度速度计的光电编码器的设计，提出了低成本的设计和制造方法。为冲压机生产企业提供了一个提高产品档次和效益的途径。     

影响防静电瓷质地板电性能测定的因素分析

分析了影响防静电瓷质地板表面电阻和体积电阻测定的主要因素.     

实验室对标准文件的要求和管理

标准文件对任何实验室来说都是非常重要的.因为它不仅是实验室、检验/测试工作的依据,也是实验室资质认定/认可能力确认的依据;它不仅是实验室检验/测试过程的程序(方法)的依据,也是实验室对测试结果符合性(合格评定)的依据.因此,实验室对标准文件的要求,控制、管理应做出有效的、科学的、适宜的控制程序和管理规定,并在实践中加以有效的实施,确保检验/测试结果的有效性、准确性和可靠性.……     

面向群体快速融合的仿生无人机集群架构

摘 要：无人机集群作战是未来战场的重要组成部分。集群内的无人机通过协作，进行载荷的互补与任务协调，以提升系统整体性能。自然界中如蚂蚁、狼、鸽子、鱼等群体，其个体与单架无人机行为类似，而蚁群、狼群、鸽群又能依靠个体间的规则，通过协调与组织实现更为复杂的行为。不同生物集群展现的能力不同，在战场上能承担的任务也各不相同。从生物集群的群体特征出发，考虑生物间的拓扑和交流机制，提出了一种仿生无人机集群的融合架构。不同种类的仿生无人机集群自由地融合，增强了无人机集群的异构性，提高仿生无人机集群架构的协调能力。     

PBA derived FeCoP nanoparticles decorated on NCNFs as efficient electrocatalyst for water splitting

Transition metal phosphides have been known as promising electrocatalysts for hydrogen evolution and oxygen evolution reactions (HER and OER) due to their high catalytic activity. In this work, the FeCoP nanoparticles decorated on N-doped electrospun carbon nanofibers (FeCoP@NCNFs) was successfully synthesized through depositing Fe, Co-based Prussian blue analogue Co₃[Fe(CN)₆]₂·10H₂O (FeCo-PBA) onto the electrospun PVP/PAN nanofibers via layer-by-layer approach, followed by carbonization and phosphorization treatments. Benefiting from the high electrical conductivity, abundant catalytic active sites and the synergistic effect between FeCoP nanoparticles and N-doped carbon nanofibers network, the obtained FeCoP@NCNFs displays good bifunctional electrocatalytic activity. In 1 M KOH, the FeCoP@NCNFs achieves 10 mA cm^?2 at an overpotential of 290, 226 mV for OER and HER, respectively. Moreover, it demands overpotential of 196 mV to achieve 10 mA cm^?2 for HER in 0.5 M H₂SO₄. The FeCoP@NCNFs is used as both anode and cathode for overall water splitting, it requires a low voltage of 1.65 V to achieve a current density of 10 mA cm^?2 and maintains outstanding stability over 10 h. Herein, a strategy for preparing bifunctional electrocatalysts of compositing transition metal phosphides with carbon nanofibers is proposed, and the application of metal-organic framework in electrocatalytic field is further extended.     

空腹和餐后状态下盐酸西替利嗪片的生物等效性研究#br#

目的：评价中国健康人群空腹和餐后状态下口服盐酸西替利嗪片的生物等效性。方法：采用单剂量、随机、开放、两制剂、两周期、交叉对照的试验设计，健康受试者每周期在空腹或餐后状态下口服受试制剂和参比制剂盐酸西替利嗪片10 mg。采用经验证的液相色谱-串联质谱（LC-MS/MS）法测定西替利嗪的血浆浓度，使用WinNonlin 6.3计算药动学参数并用SAS 9.4软件进行生物等效性评价。结果：空腹状态下，受试制剂和参比制剂中西替利嗪Cmax分别为（402±84）、（379±53） ng/mL，AUC0-t分别为（2 520±491）、（2 455±480） ng·mL-1·h，AUC0-∞分别为（2 623±483）、（2 608±441） ng·mL-1·h。餐后状态下，受试制剂和参比制剂中西替利嗪Cmax分别为（221± 55）、（221±36）ng/mL，AUC0-t分别为（2 046±524）、（2 067±513） ng·mL-1·h，AUC0-∞分别为（2 142±508）、（2 165±500） ng·mL-1·h。受试制剂和参比制剂西替利嗪Cmax、AUC0-t和AUC0-∞几何均值比的90%置信区间均在80.00%～125.00%的生物等效性范围内。结论：盐酸西替利嗪片受试制剂和参比制剂在空腹和餐后状态下均具有生物等效性。     

无线传感器网络高效的MAC协议研究

目前无线传感器网络中的MAC协议可分为发送端启动和接收端启动两类.同步的发送端启动协议同步代价高,基于前导的异步协议网络利用率低,而接收端启动的算法会产生发送端盲等等问题.本文结合这两类协议的优点,提出一种可自适应变换数据传输模式的MAC协议(IL-MAC).该协议根据节点的消息队列长度决定当前使用哪种传输模式,并通过...     

二丙基次磷酸铝对尼龙6的阻燃作用

通过极限氧指数测定、垂直燃烧实验和锥型量热分析研究了二丙基次磷酸铝(ADPP)对尼龙6(PA6)的阻燃作用。结果表明,ADPP对PA6具有良好的阻燃效果。当ADPP添加量为15%时,阻燃PA6的LOI就高达30.7%,阻燃等级达V-0。与未阻燃PA6相比,燃烧时的热释放速率和质量损失速率显著降低,但累计热释放量略有增大。热重和残余物分析结果表明,ADPP是通过气相和凝聚相同时产生阻燃作用的。一方面它通过分解成不挥发性磷酸铝和促进PA6成炭,形成膨胀层而产生阻燃作用;另一方面,它分解成挥发性磷化物,在气相通过捕获燃烧产生的自由基而抑制燃烧。ADPP热稳定性良好,能满足聚酰胺的加工要求,但其使用明显降低了PA6的热稳定性。     

Dual Cocatalysts in TiO2 Photocatalysis

Semiconductor photocatalysis is recognized as a promising strategy to simultaneously address energy needs and environmental pollution. Titanium dioxide (TiO₂) has been investigated for such applications due to its low cost, nontoxicity, and high chemical stability. However, pristine TiO₂ still suffers from low utilization of visible light and high photogenerated‐charge‐carrier recombination rate. Recently, TiO₂ photocatalysts modified by dual cocatalysts with different functions have attracted much attention due to the extended light absorption, enhanced reactant adsorption, and promoted charge‐carrier‐separation efficiency granted by various cocatalysts. Recent progress on the component and structural design of dual cocatalysts in TiO₂ photocatalysts is summarized. Depending on their components, dual cocatalysts decorated on TiO₂ photocatalysts can be divided into the following categories: bimetallic cocatalysts, metal–metal oxide/sulfide cocatalysts, metal–graphene cocatalysts, and metal oxide/sulfide–graphene cocatalysts. Depending on their architecture, they can be categorized into randomly deposited binary cocatalysts, facet‐dependent selective‐deposition binary cocatalysts, and core–shell structural binary cocatalysts. Concluding perspectives on the challenges and opportunities for the further exploration of dual cocatalyst–modified TiO₂ photocatalysts are presented.