锦纶6切片质量对FDY纺丝的影响

阐述了锦纶６切片的粘度、低聚物含量、水份含量等主要质量指标对ＦＤＹ可纺性的影响,并初步分析了其影响机理及影响趋势,提出了生产ＦＤＹ用锦纶６切片的质量控制范围和要考虑的因素．     

铼掺杂WO3材料的VOCs气敏特性

通过掺杂法制得一系列不同Re2O7掺杂量的WO3粉体,测试了元件的气敏性能。研究发现：适量掺杂Re2O7,不仅可以显著降低WO3的电阻值,而且有利于提高WO3纳米材料对VOCs气体的灵敏度,其中掺杂量为6%（质量分数）的烧结型气敏元件在300℃下对VOCs有较高的灵敏度和选择性,是一种气敏性能很好的VOCs气敏元件。     

基于货运车辆车载GPS大数据的道路超速率计算与分析

在我国交通事故统计中,人为失误导致的交通事故占90％,超速行为的危险性已引起各界重视.尤其大型货物运输车辆,其重量大,制动性能较差,该类车辆超速导致的交通事故通常比较严重.对货物运输平台提供的车辆行驶相关数据(包括GPS定位数据、时间数据、速度数据)进行处理和分析.通过OSMnx在Open Street Map下载广东地图数据并处理,运用隐马尔科夫模型对原始GPS定位数据进行地图匹配,对车辆行驶数据进行LSTM时间序列建模和学习训练,将训练好的网络用于各个路段车辆超速的预测.结果表明,该方法能够很好地拟合超速率的变化趋势,物流平台可以根据预测结果对司机进行提醒,对减少驾驶员的超速行为和保障安全行驶具有重要意义.     

变工况下热泵供热及膨胀机供热的热力性能对比分析

通过对各设备进行建模,以某300 MW热电联产机组为例,对热泵供热及利用小型膨胀机发电后排汽供热两种方案进行变工况分析。结果表明,对于热泵供热方案,在不同的主蒸汽流量下,都存在一个最佳出口热网水温,使系统煤耗最低;采用热泵最佳参数与膨胀机方案进行变工况对比,发现在采暖抽汽参数较低时,热泵方案的煤耗高于膨胀机方案,随着采暖抽汽参数的增大,当热泵出口最佳热网水温超过70℃时,热泵方案的煤耗开始低于膨胀机方案;同样,在采暖抽汽参数较低时,热泵供热效率比膨胀机方案低,当热泵出口最佳热网水温超过64℃时,热泵方案供热效率开始超过膨胀机方案;提出等效节能量指标,并通过计算表明该指标可用于对比两方案的节能效益。     

计及故障持续时间的换流变压器阀侧单相接地故障分析

换流变压器阀侧单相接地故障发生时刻具有随机性,其相对于换流阀通断时刻的位置不同,会导致不同的暂态过程。首先提出了类换相失败的概念,以换相失败和类换相失败为切入点,在将故障发生时刻分段的基础上,考虑了瞬时性故障时,故障持续时间对于换流器暂态过程的影响。理论分析和仿真验证表明,换流变压器阀侧高压桥发生故障时,会立即造成类换相失败的发生,而低压桥瞬时性故障时,可能不对外体现故障特征。     

基于光声传感器的道边空气质量监测站设计

道边空气污染问题日益严重,为了适应道路空气质量监测的需要,设计了基于光声传感器的道边空气质量监测站,介绍了系统的工作原理、硬件原理图、软件流程图以及GPRS数据传输流程图,并着重介绍了光声传感器的原理和设计。监测站采用基于气体光声光谱原理的光声传感器检测道边环境中污染气体的浓度,并通过LCD显示屏显示监测结果,同时通过GPRS通信网络将数据传输给监控中心用于研究,整个监测站具有体积小、成本低、实时性和自动监测的特点,便于应用于道边环境监测。     

C312-1型大功率LDMOS功率管外壳

<正>LDMOS功率管在雷达、无线通讯基站、无线广播发射塔等电子系统中具有广泛的应用,而该类器件对外壳的散热和可靠性有很高的要求。南京电子器件研究所最近研制成一种用于封装300 W LDMOS功率管的高可靠外壳—C312-1型多层陶瓷外壳,具有比较优异的性能。该外壳由金属底板、陶瓷框架和陶瓷盖板组成,器件采用金锡封帽工     

LTCC 450 MHz CDMA功放模块的研制

对LTCC埋层电感进行了研究,以研制体积小、低损耗、微波性能好的高密度功放模块。利用商用三维电磁场分析软件HFSS对LTCC集成化功率放大器PA组装和互连中的关键参数进行了仿真和优化。研制出450MHzCDMA手机LTCC功率放大器,增益29.0dB,VSWR为2.0∶1,PAE为34%,体积为6mm×6mm×1.2mm。     

Fabrication of Ultra-Durable and Flexible NiPx-Based Electrode toward High-Efficient Alkaline Seawater Splitting at Industrial Grade Current Density

Designing nonprecious metal-based electrocatalysts to yield sustainable hydrogen energy by large-scale seawater electrolysis is challenging to global emissions of carbon neutrality and carbon peaking. Herein, a series of highly efficient, economical, and robust Ni–P-based nanoballs grown on the flexible and anti-corrosive hydrophobic asbestos (NiP_x@HA) is synthesized by electroless plating at 25 °C toward alkaline simulated seawater splitting. On the basis of the strong chemical attachment between 2D layered substrate and nickel-rich components, robust hexagonal Ni₅P₄ crystalline modification, and fast electron transfer capability, the overpotentials during hydrogen/oxygen evolution reaction (HER/OER) are 208 and 392 mV at 200 mA cm⁻², and the chronopotentiometric measurement at 500 mA cm⁻² lasts for over 40 days. Additionally, the versatile strategy is broadly profitable for industrial applications and enables multi-elemental doping (iron/cobalt/molybdenum/boron/tungsten), flexible substrate employment (nickel foam/filter paper/hydrophilic cloth), and scalable synthesis (22 cm × 22 cm). Density functional theory (DFT) also reveals that the optimized performance is due to the fundamental effect of incorporating O-source into Ni₅P₄. Therefore, this work exhibits a complementary strategy in the construction of NiP_x-based electrodes and offers bright opportunities to produce scalable hydrogen effectively and stably in alkaline corrosive electrolytes.     

In Situ Coupling of Carbon Dots with Co-ZIF Nanoarrays Enabling Highly Efficient Oxygen Evolution Electrocatalysis

Metal-organic frameworks (MOFs) are regarded as one promising class of precatalysts for electrocatalytic oxygen evolution reaction (OER), yet most of them suffer from poor conductivity and lack of coordinatively unsaturated metal sites, which hinders the fast electrochemical reconstruction and thus a poor OER activity. To address this issue, a unique heterocomposite has been constructed by in situ inserting carbon dots (CDs) into cobalt-based zeolitic imidazolate framework (Co-ZIF) nanosheet arrays (Co-ZIF/CDs/CC) in the presence of carbon cloth (CC) via one-pot coprecipitation for alkaline OER. Benefiting from the synergism between CDs and Co-ZIF subunits such as superior conductivity, strong charge interaction as well as abundant metal sites exposure, the Co-ZIF/CDs/CC exhibits an enhanced promotion effect for OER and contributes to the deep phase transformation from CDs-coupled Co-ZIF to CDs-coupled active CoOOH. As expected, the achieved Co-ZIF/CDs/CC only requires an overpotential of 226 mV to deliver 10 mA cm⁻² in 1.0 M KOH, which is lower than that of Co-ZIF/CC and superior to most previously reported CC-supported MOF precatalysts. Moreover, it can also maintain a large current density of 100 mA cm⁻² for 24 h with negligible activity decay.