高压变频器在洗煤厂介质泵上的应用

本文介绍了风光牌高压变频器在新疆伊犁钢铁有限责任公司洗煤厂介质泵的应用情况,对应用案例进行了介绍。结果表明,在洗煤厂介质泵上采用高压变频器具有较高的经济效益和社会效益。     

一类时延网络控制系统的最优非脆弱H∞控制

针对一类时延网络控制系统,研究了当存在有限能量外部扰动时,系统的最优状态反馈非脆弱H_∞控制律的设计问题。通过将时延看作系统的时变参数不确定性,应用H_∞鲁棒控制理论及线性矩阵不等式(LMI)技巧,给出了具有控制增益扰动的次优非脆弱H_∞控制律存在的充分条件,提出了最优非脆弱H_∞控制律的设计方法。数值仿真例子表明了所提方法的有效性。     

苦荞可可蛋糕的研制

结合传统的海绵蛋糕工艺,将苦荞粉和可可粉代替部分低筋面粉,通过单因素和正交试验确定最佳配方,制得优质的苦荞可可蛋糕。本试验结果表明,苦麦可可蛋糕最佳配方为:低筋面粉70 g,苦荞粉20 g,可可粉10 g,糖70 g,鸡蛋120 g,牛奶50 g,蛋糕油3.5 g,泡打粉1.5 g,盐1.5 g。本试验为其他苦荞系列蛋糕的研制提供了理论依据。     

渗碳层中的碳化物对渗碳齿轮强度的影响

从齿轮受力和失效特点出发,通过金相检验分析,指出了渗碳层中的碳化物对齿轮强度有害,渗碳淬火后的齿面应避免出现碳化物．在实际生产中为了使齿根含碳量接近共析成分,以齿顶部出现少量碳化物为宜．     

高振实密度球形镍粉研制

论述了液相还原法直接制备高振实密度球形镍粉的新工艺。原料采用NiSO4·5H2O,利用NaOH调节溶液的pH值并形成Ni(OH)2,还原剂采用N2H4·H2O,还原过程中加入晶核引发剂及表面活性剂。研究工作采用正交试验法安排实验,分析了对镍粉的振实密度及粒径的影响因素之主次顺序,得出实验室规模的较优工艺组合条件为: g (N2H4·H2O/Ni2+)≥2.2;反应时间为24 min左右;Ni2+的浓度为2.0 mol/L;g (NaOH/Ni2+)为1.1;反应温度为80℃。新工艺可制备振实密度高达3.0以上、质量中位径约为1 mm的高质量球形镍粉。     

气缸孔两种激光表面处理加工技术的比较

本文简要介绍了激光淬火技术和激光珩磨技术,并从耐磨延寿机理、主要技术要素、处理加工工艺以及应用 效能等方面对它们进行了比较研究,结果表明两者是不同的激光表面处理加工方法。     

The Influences of DMF Content in Composite Polymer Electrolytes on Li+-Conductivity and Interfacial Stability with Li-Metal

Trace N, N-dimethylformamide(DMF) containing composite polymer electrolytes (CPEs) has attracted much attention owing to the dramatically increased Li⁺-conductivity. But the amount of DMF is critical and needs to be clarified for the interfacial stability, since DMF is easily reduced by Li-metal. Herein, the influences of DMF in poly(ethylene oxide) (PEO) and poly(vinylidene fluoride) (PVDF) based CPEs are studied on the Li⁺-conductivity and interfacial stability. In PEO-based CPEs, owing to a stronger interaction of lithium bis(trifluoromethanesulfon)imide (LiTFSI) with PEO than DMF, DMF can not be confined and be easily evaporated off. Only ≈0.25wt.% DMF is absorbed on ceramic electrolyte fillers, giving two times increased Li⁺-conductivity compared with the DMF-free counterparts and generating stable interface with Li-metal; but over much DMF (≥2.2 wt.%) leads to serious interfacial reactions with Li-metal. While in PVDF-based CPEs, ≈8wt.% DMF is confined by LiTFSI owing to a stronger interaction of LiTFSI with DMF than with PVDF. Short-term stable interface with Li-metal can be obtained, but longer-term cycling or higher current density leads to the gradually aggravated reactions with Li-metal. Thanks to the high-voltage stability of PVDF based CPEs, better cycling performance is obtained when they are used as catholytes to match high-voltage cathodes.     

液晶TFT有源矩阵单元性能分析

本文详细分析液晶薄膜晶体管(TFT)有源矩阵单元性能.其中包括薄膜晶体管单元结构特性和液晶单元电容充放电物理过程。通过分析,推导出有用的计算公式。这些结果对实际工作具有指导作用。     

Dynamic Survivability in WDM Mesh Networks Under Dynamic Traffic

Network survivability is a crucial requirement in WDM mesh networks. In this paper, we systematically consider the problem of dynamic survivability with dynamic single link failure in WDM networks under dynamic traffic demands. Specifically, we investigate various protection schemes, such as dedicated path protection (DPP), shared path protection (SPP), dedicated link protection (DLP), shared link protection (SLP), and two restoration schemes, path restoration (PR) and link restoration (LR). Moreover, two new shared protection methods are proposed, i.e., SRLG-based shared link protection (SRLG-SLP) and SRLG-based shared path protection (SRLG-SPP). The SRLG (shared risk link group) constraint defines the availability of protection resources to a working path, which requires that any two working paths sharing the same risk of failure (or in the same SRLG) cannot share the same protection resources. Furthermore, in our study, we consider a more practical dynamic single-link failure model, in which the link-failure-interarrival time and link-failure-holding time are considered as two independent parameters. Based on this link-failure model, extensive simulations are done to analyze and compare the dynamic survivable performance of various protection and restoration schemes. Resource utilization, protection efficiency, restoration efficiency, and service disruption ratio are employed as survivable performance metrics versus traffic load, link-failure frequency, and link-failure reparation time to evaluate the survivable performance. Many meaningful results are given. In addition, we show that the developed SRLG-SLP and SRLG-SPP protection schemes perform very well in terms of protection efficiency and service disruption ratio, while sacrificing some performance in terms of resource utilization.     

G-band (140-220-GHz) InP-based HBT amplifiers

We report tuned amplifiers designed for the 140-220-GHz frequency band. The amplifiers were designed in a transferred-substrate InP-based heterojunction bipolar transistor technology that enables efficient scaling of the parasitic collector-base junction capacitance. A single-stage amplifier exhibited 6.3-dB small-signal gain at 175 GHz. Three-stage amplifiers were subsequently fabricated with one design demonstrating 12.0-dB gain at 170 GHz and a second design exhibiting 8.5-dB gain at 195 GHz.