橱窗里的预级设计

正英国著名的百货公司Harrods携手世界顶级设计杂志Wallpaper*,在设计与工艺的摩登之旅上又迈进了一大步。在Harrods举行展览活动中,特别展出了Wallpaper*Handmade过去4年里与全球顶级设计师、艺术家和品牌合作推出的50件设计作品,而这50件作品的展出形式也非常特别,全部在Harrods商场沿布朗普顿路(Brompton Road)的12个橱窗里呈现,包含有Hermes、Alfredo     

离子液体在生物大分子中的应用研究进展

离子液体作为一种可设计性的绿色溶剂和高效催化剂,以其热稳定性好,催化性强,电导率高,溶解能力强,零蒸汽压等特性,在诸多领域具有广泛的应用。本文总结了离子液体的历史、制备、应用,主要介绍了目前离子液体在纤维素、胶原蛋白、角蛋白等生物大分子中的应用研究。同时重点介绍了离子液体在制革固废物和废水处理中的应用,并指出离子液体在皮革应用领域具有巨大前景。     

表面活性剂对酶活性的影响研究进展

综述了不同类型表面活性剂对脂肪酶、蛋白酶与纤维素酶活性的影响。一般的结论是,非离子表面活性剂对酶活性影响较小,甚至有激活作用;阴离子表面活性剂对酶活性影响大,主要起抑制作用。同时,指出这些影响规律对皮革行业有效利用酶与表面活性剂的协同作用具有指导意义。     

大功率机车用轴流冷却风机叶轮的改进设计

大功率电力机车发动机用冷却风机是保证机车运行安全的重要设备,但目前国内该类车用冷却风机主要依赖进口.论文在一维设计基础上,通过三维数值软件 NUMECA 对某大功率8轴机车用轴流冷却风机叶轮进行方案分析并改进设计,获得了性能较好的叶轮模型.在满足外形尺寸不变及限制功率的前提下,降低转速和流量,实现了出口风压相对提高并改善了效率,该冷却风机已装车运行.     

首钢矿业公司烧结厂实施小球烧结技术

该厂和北京钢铁研究总院联合开发的小球烧结新技术,以强化混合制粒、燃料分加、提高混合料温度为主要特征,实现了低温烧结.表面点火温度降低150℃以上,每吨烧结矿点火重油消耗降低0.5 kg以上,烧结过程温度降低100℃左右,燃料消耗降低8 kg/t以上,台车料厚提高到650～ 700 mm左右.经过完善和创新,对于改善成品矿质量,降低消耗发挥了突出作用,收到了显著的经济效益,电耗降低10kW*h/t以上,烧结机利用系数提高10%以上,成品矿运输到北京末子降低5%以上.     

Study on parameters of L-[1-13C]phenylalanine breath test for quantitative assessment of liver function in healthy subjects and patients with hepatitis B virus-related liver disease

1 Introduction Hepatitis B virus-related liver disease is the most common hepatopathy around the world, especially in developing countries like China, which brings more and more increasing healthy and social burden. To measure liver function accurately is critical for moni-toring the progression of liver dysfunction; evaluating the effect of treatment; predicting long term prognosis and risk of surgical interventions and optimal timing of liver transplant. But in clinic, there are few routine…     

基于循环平稳性的异构网OFDM系统窄带干扰消除

在异构网正交频分复用系统中,异系统窄带干扰会造成系统性能的下降。该文提出一种基于信号循环平稳性的异系统窄带干扰消除算法,对干扰进行估计和消除,推导了干扰消除的信干噪比增益。仿真结果表明,与传统的线性预测滤波算法相比,该文提出的方法可以更为准确地估计窄带干扰信号,消除异系统干扰,提高系统性能。     

Tensile properties and fracture characteristics of spray cast alloy IC6 （Ni-7.8Al-14Mo-0.05B）

Tensile testing results of spray cast Ni3Al-based superalloy indicated that the yield strength and tensile strength increase with the increasing of temperature and reached maximum at around 760℃, then decrease with the increasing of temperature. After high temperature isostatic pressing (HIP), yield strength decreased and ductility and tensile strength increased. Stereographic projection showed that no matter at room temperature, medium temperature or high temperature, cracks extend along (111).     

Corrosion of two kinds of cast steels containing chromium in hot concentrated alkaline

A typical hot concentrated alkaline corrosion environment exists in alumina metallurgical industry, so that steel materials with outstanding alkaline corrosion resistance are strongly demanded for its processing equipment. In this paper, the corrosion resistance of two kinds of martensitic cast steels containing chromium in static 303g/L NaOH alkaline solution at 85℃ was studied through polarization and potential-time curves, corrosion weight loss and corrosion morphology analysis. Experimental results showed that protection effect by passive film of cast steel containing Cr was temporary. The low carbon steel without Cr content also exhibited chemical passivity in the same solution. The corrosion mode of the tested Cr-containing cast steel was composed of active dissolving corrosion and caustic embrittlement cracking. Dissolving corrosion was the primary mechanism for the induced weight loss, while severe caustic embrittlement cracking was secondary. With the increase of chromium content in the cast steel, the tendency of the caustic embrittlement cracking decreased, while the active dissolving corrosion increased.