智能水位监控终端的设计

介绍了一种智能水位监控终端系统的设计方案。以低功耗51单片机作为核心处理器,分别对雨量计和水位计的采集数据进行处理,最后通过GPRS网络传输到监控中心。利用模拟搭建的电子开关继电器控制电源的闭合断开达到节省功耗的目的。     

并用比对氟橡胶/氟硅橡胶并用胶性能的影响

将氟橡胶与氟硅橡胶/硅橡胶混炼胶并用,制备氟橡胶/氟硅橡胶并用胶,研究氟橡胶/氟硅橡胶并用比对并用胶性能的影响。结果表明:随着氟硅橡胶用量增大,并用胶的脆性温度降低,耐低温性能明显提高;当氟橡胶/氟硅橡胶并用比为8/2时,并用胶的微观结构未出现明显分层现象,物理性能较好。     

工艺参数对半固态Al-4Cu-Mg合金微观组织与性能的影响

采用应变诱发熔化激活工艺(SIMA)制备了半固态Al-4Cu-Mg合金，并对其组织性能进行了研究。结果表明：通过合理选择SIMA工艺参数，能够得到晶粒尺寸小且呈近球状的半固态组织；SIMA工艺参数对晶粒的大小和形状产生较大的影响。变形量越大、等温温度越低和保温时间越短，晶粒尺寸越小；变形量越大、等温温度越高和保温时间越长，分形维数越小，晶粒越圆整；采用变形量为20％～25％、等温温度为580～600℃和保温时间为2～6min的合理SIMA工艺参数，可获得室温抗压强度和屈服强度分别为358～387MPa和246-265MPa的半固态材料。     

Electrode Engineering by Atomic Layer Deposition for Sodium‐Ion Batteries: From Traditional to Advanced Batteries

Sodium‐ion batteries (SIBs) have emerged as one of the most promising and competitive energy storage systems due to abundant sodium resources and its environmentally friendly features. However, further improvements in the engineering of the SIB electrode/electrolyte interphase—which directly determines the Na‐ion transfer behavior, material structure stability, and sodiation/desodiation property—are highly recommended to meet the continuously increasing requirements for secondary power sources. Reasonably speaking, to promote SIBs, the advanced and controllable interphase/electrode engineering approach exhibits promise by rationally designing the bulk electrode and generating a well‐defined interphase. Atomic layer deposition (ALD) technology, with atomic‐scale deposition, superior uniformity, excellent conformality, and a self‐limiting nature, is thus expected to address the current challenges facing SIBs in terms of low energy density, limited cycling life, and structural instability, and to promote innovations such as multifunctional electrodes and nanostructured materials for advanced SIBs. This review summarizes and discusses the most recent advancements in the interphase engineering of SIBs by ALD via modifying traditional electrodes and designing advanced electrodes (such as 3D, organic, and protected sodium metal electrodes). Furthermore, based on the recent critical progress and current scientific understanding, future perspectives for the engineering of next‐generation SIB electrodes by ALD can be provided.     

HiGee Strategy toward Rapid Mass Production of Porous Covalent Organic Polymers with Superior Methane Deliverable Capacity

High porosity with well‐defined molecular reticulation along with strong stability is desired for natural gas delivery. The catalyzed Yamamoto‐type Ullmann cross‐coupling route with efficient terminal halogen removal capability is currently used to prepare porous organic materials with high specific surface area as well as ultrahigh hydrothermal stability. As a typical fast coupling reaction, the traditional stirred solvothermal approach shows the limitation of macroscopic reaction kinetics due to the increasing viscosity of the reaction mixture with the molecular network growth until it turns to a jelly‐like consistency. Herein, a high‐gravity chemical synthetic strategy to achieve rapid and economical preparation of a class of, but not limited to, covalent organic polymers (COPs) with high hydrothermal stability using the Ullman cross‐coupling route is described. The viscous fluid is vigorously split into homogeneous microdroplets through the rotating packed bed (RPB) under the HiGee environment. The HiGee approach shortens the traditional reaction time from 600 to 15 min as well as reduces the usage of high‐cost nickel (0) catalyst by 40 wt%. Specially, the COP‐10 obtained with the HiGee approach displays an excellent deliverable methane capacity of 415 cm³ _STP g^?1 at 298 K with working pressures 5–65 bar, which is higher than that of most reported porous organic materials.     

基于人群搜索算法优化PID的矿井提升机调速系统

针对传统矿井提升机变频调速系统存在的因超调量大、控制精度不高导致的矿井提升机调速效果差的问题,提出一种人群搜索优化PID控制器的方法,相较于传统的PID控制调速系统,该系统具有调节速度快和系统鲁棒性好的特点,解决了传统调速系统存在的问题.     

软件定义空基骨干网中的编码感知机会路由方案

为保障空基通信任务的高效实施,针对软件定义空基骨干网中路由信息交互时存在的时延、开销以及可靠性方面的不足,提出一种改进的兼具软件定义与网络编码优势的CAOR-SD方案。该方案在沿用编码感知机会路由基本思想的前提下,将节点距离与编码收益综合考虑构造转发消耗函数进行候选转发节点优先级的分配,从而提高网络传输效率;同时对控制报文的反馈机制和节点的流表结构进行设计,控制开销有效降低。仿真结果表明,该路由方案可较好地适应空基通信场景,能够降低传输时延和路由开销,提高网络吞吐量和数据成功传输率。     

基于能效的D2D通信系统的干扰协调与资源优化

针对传统蜂窝用户与D2D通信用户之间的同频干扰问题,本文提出基于能效的D2D通信干扰协调与资源优化方案。该方案采用功率控制与资源分配分步进行的方式进行处理,首先是对于单个D2D用户的功率控制,在蜂窝用户最小速率以及D2D用户和蜂窝用户最大功率的限制条件下,通过优化D2D用户和蜂窝用户的功率使得D2D用户的能效最大,在此阶段,采用基于参数法的Dinkelbach算法来进行用户的功率分配;最后借助Kuhn-Munkres (KM)算法为D2D用户分配蜂窝频谱资源,以使得D2D用户的总能效最大。仿真结果表明,相比于其他方案,在保证蜂窝用户正常通信时,该方案能够进一步提高系统内D2D用户的能量效率,使能效优化效果更明显。     

锂硫二次电池硫基正极材料的研究进展

作为新一代的储能体系,锂硫二次电池以高的理论能量密度(2 600 m Ah/g),廉价的正极材料以及环境友好等特点受到广泛的关注。但是,由于硫的绝缘性和充放电过程中体积的膨胀、锂硫之间复杂的电化学反应及其产物多硫化物的溶解性等诸多问题的存在,阻碍了锂硫二次电池走向商业化。本文从无机金属化合物与硫复合、导电高分子与硫复合、纳米碳及其衍生物与硫复合,以及三元复合等方面出发,综述了近年来锂硫电池正极材料的研究现状,并展望了该材料的未来发展趋势。     

GB/T18801―2015《空气净化器》国家标准修订若干关键技术研究

近几年,随着我国大气环境中颗粒污染物浓度的持续降低以及新冠疫情的暴发,消费者对居室空气环境质量及空气净化器的使用提出了新的更高要求,GB/T 18801—2015《空气净化器》国家标准亟需在指标的规范性、气态污染物去除评价、病毒去除评价、二次异味评价等方面进行修订.在开展了大量的数据分析和多轮比对试验验证工作的基础上,重点在关联指标建立、气态污染物混合加载试验方法、病毒去除评价及试验方法、模拟二次异味评价及试验方法和动态平衡试验方法等方面开展了深入研究工作,并结合研究结果对GB/T 18801—2015标准进行了补充和完善.修订后的GB/T 18801—2015评价指标更加规范,试验方法的针对性更强,对行业的引领作用更加显著.