区域产业集群发展对策研究——以辽宁装备制造业为例

本文从理论上界定了区域产业集群的内涵与分类,针对辽宁装备制造业集群发展现状与存在的问题,从4个方面提出进一步促进辽宁装备制造业集群发展的思路与对策。     

成捆圆钢端面自动贴标系统设计

为实现钢铁企业成捆圆钢端面贴标的自动化,在分析圆钢生产工艺的基础上设计出一套成捆圆钢端面自动贴标系统。该系统包括机器视觉定位单元、供标单元、供压单元、自动贴标单元、激光测距单元和上位机通信控制单元等,采用机器视觉定位单元进行圆钢端面中心的平面定位,通过自动贴标单元实现成捆圆钢端面的自动贴标。在实验室条件下对系统进行测试,结果表明,该自动贴标系统可有效地解决人工贴标中存在的错贴、漏贴等问题,实现成捆圆钢端面高效、稳定的自动贴标。该系统可用于钢铁企业中成捆圆钢端面的自动化贴标。     

气相色谱法直接进样测定工业废气中的苯乙烯

建立了直接进样测定工业废气中苯乙烯的气相色谱法.工业废气样品通过气体进样阀进入气相色谱仪中进行分离和检测,采用0.25 mL气体进样阀时,方法的检出限为1.4 mg/m3,苯乙烯含量在3.19～51.0 mg/m3时,测定结果的相对标准偏差为2.19％～4.50％(n=5),与行业标准HJ 583-2010,HJ 584-2010相比,该方法操作简便、快速,适合工业废气中苯乙烯的快速测定.     

Rheological Analysis of Biopolymer Produced by Aureobasidium Pullulans in Different Sources of Nitrogen

Summary: In this study, the rheological behaviors of media fermented by two Aureobasidium pullulans strains (IOC 3467 and IOC 3011) were evaluated in different nutritional conditions. The media consisted of crystal sugar (sucrose), as the main carbon source, and different nitrogen sources (ammonium sulfate, sodium nitrate, ammonium nitrate, urea or residual brewery yeast - RBY). Viscosity measurements were performed on cell-free supernatants, from 48-hour fermentation assays, at 25 ^°C. Shear rates ranged between 0.1000 and 500 s⁻¹. All samples showed pseudoplastic behavior. Nevertheless, the viscosimetric profile of each one varied according to the nitrogen source, its concentration and the strain used. The maximum viscosity of 0.06 Pa.s. was achieved at 15.6 s⁻¹ for IOC 3011 strain grown on RBY as nitrogen source.     

Overcoming the limitations of lithiation chemistry for organoboron compounds with continuous processing

Quite a process: Recent pioneering reports establishing proof of concept for conducting lithiation chemistry to produce organoboron products in a continuous fashion are highlighted.     

Refining of plant oils to chemicals by olefin metathesis

Plant oils are attractive substrates for the chemical industry. Their scope for the production of chemicals can be expanded by sophisticated catalytic conversions. Olefin metathesis is an example, which also illustrates generic issues of "biorefining" to chemicals. Utilization on a large scale requires high catalyst activities, which influences the choice of the metathesis reaction. The mixture of different fatty acids composing a technical-grade plant oil substrate gives rise to a range of products. This decisively determines possible process schemes, and potentially provides novel chemicals and intermediates not employed to date.     

Microdetermination Par Polarographie Impulsionnelle Differentielle Du Chrome (VI) Present Dans Les Ciments Industriels

Abstract

The toxicological literature often mentions that chromium(VI), present and added to cements for technical reasons, induce dermatosis. Good analytical techniques are not available. The D.P.P. method proposed here for the microdetermination of chromium (VI) in cements is fast and selective. The cation is solubilized by stirring the cement with distilled water. After filtration, the solution is submitted to differential pulse polarography. Generally, samples analysed contain between 1 and 12 mg of chromium (VI) per kg of cement. The potential peak is -0.19 V v.s. S.C.E. for the pure chromium (VI) solution and is shifted toward between -0.25 and -0.30 V v.s. S.C.E. when chromium (VI) is extracted from real cement samples The detection limit is 0.3 ppm.     

Applications of Terahertz Spectroscopy in the Field of Construction and Building Materials

Abstract: In last two decades, rapid development in the field of terahertz (THz) technology has opened new possibilities for creating innovative imaging and sensing systems. Although the applications of THz technology in different sectors constantly increase, the construction industry lags behind them. The aim of this article is to review the current applications of THz spectroscopy in research and industry related to construction and building materials, along with the key drawbacks of technology and recommendations for future use. The review concludes that THz spectroscopy and imaging have promising potential and provide many opportunities for applications in construction and building materials characterization.     

低能X射线工业CT小间隔信号采集系统

为克服探测器阵列获取速度慢、重建图像精度低的缺点,并能在低能X射线的小焦点/微焦点CT系统中完成对小型精密复杂器件的检测,研究了低能X射线工业CT的小间隔信号采集系统。系统选取DT公司0.2 mm像素尺寸、高集成度、扫描速度快的X-CARD 0.2-256G为探测器,Altera公司的Cyclone EP1C3T为主控芯片,Intel公司的LXT972A为以太网控制芯片。从数据传输的可靠、稳定、高效率角度出发,用模块化的方法给出了系统的硬件设计,用有限状态机技术完成了系统的逻辑单元设计,并对系统的动态范围进行了测试。测试实验结果表明,系统的动态范围大于4000,能够检测精密器件、准确迅速地完成信号的采集传输,满足实际工业CT对信号采集的要求。     

上海市典型工业区大气中VOCs及其来源分析

为更好地了解和掌握上海市某典型工业区挥发性有机化合物(VOCs)的污染情况和来源,对该区2009~2015年大气环境的VOCs数据进行了统计分析.数据分析结果表明:该区域总挥发性有机物(TVOC)浓度随季节变化,呈冬季高、春夏季低的规律;大气中共检测出48种VOCs,其中,乙酸乙酯占比为30%、n-庚烷占比为11%、庚烷占比为10%、甲苯占比为7%(质量分数);分析T/B(甲苯与苯的体积分数之比)的比值:该工业区大气环境中VOCs浓度主要受有机溶剂挥发的影响,工业区周围居民区大气环境中VOCs浓度主要受机动车尾气排放量的影响.