HPLC Columns,Theory, Technology,and Practice

ABSTRACT

This paper presents some results of experimental research addressing the influence of different thermal insulation fillings on dynamic properties of industrial resistance temperature probes, based on a thin-film platinum resistance temperature detector. The experiments were carried out with four jacket thin-film resistance temperature probes, all having identical protection tube geometry, yet differing in the thermal insulation filling materials. Further, a comparison between transient response characteristics in water established experimentally and those based on simulations with electric–thermal analogy, is given. The results of these analyses can be applied to enhance the dynamic response of temperature measurement made by temperature probes in water.     

ICP-AES法测定碳钢、低合金钢中13种元素

本文选择了硝酸、王水、逆王水,进行碳钢、低合金钢溶样条件试验,以谱线强度为指标,溶解酸种类、溶解酸浓度、溶解酸用量、定容酸用量等四因素为变化条件,各因素中有三水平,即按正交实验表L_9(3~4)进行试验,编制计算程序,快速、科学地优选出最佳溶样条件—30ml NHO_3(1+5v/v)和3ml HCl,ICP-AES法同时测定铝、砷、铬、钴、铜、磷、锰、钼、镍、硅、锡、钛和钒13种元素。为确定测试方法的重复性(r)和再现性(R)而进行精密度试验。精密度数据是由10个实验室对7个样品作试验确定的。方法的回收率为94％-105％。精密度在8％以内。     

Determination of Calcium,Zinc, and Phosphorus in multigrade crankcase oils by XRF,DRES, and ICP-AES

The effect of viscosity index improvers such as styrene-isoprene copolymer (SICP), styrene-butadiene copolymer (SBCP), ethylene-propylene copolymer (OCP) and poly(alkyl) methacrylate (PMA), in multigrade oils on the determination of Ca, Zn and P in fresh and used lubricating oils was studied using XRF, DRES and ICP-AES techniques. Crankcase lubricating oil blends containing known amounts of Ca (2900 ppm), Zn (1700 ppm) and P (1600 ppm) were further formulated with different concentrations of these VI improvers and analysed for their Ca, Zn, and P contents by XRF, DRES and ICP-AES. Based on a comparison of the resulting analytical data, it was concluded that the VI improvers had no effect on the analysis results, and that the concentrations of Ca, Zn and P in the oil determined by these techniques correlate well with each other.     

土壤中铅铬铜铁锌锰钙的测定

报道使用全酸法消解土壤，并用同一消解液分剐测定土壤中的铅、铬、铜、铁、锌、锰、钙等金属元素。其中铅使用原子荧光光谱法测定，其他元素使用火焰原子吸收光谱法测定。方法准确、快速、简便，适用于环境土壤中多种元素的测定，结果满意。     

多目标的搜索、成像、跟踪、测控与通信

本文讨论了以下技术：空中多目标搜索与成像,给出了一种基于闪光照相原理设计的微波成像系统。这一系统经济、实用,采用的DOA算法先进;空中多目标的精密跟踪,提出了2种基于天线阵和数据处理的跟踪系统：一种是梯度跟踪系统,另一种是单脉冲系统。它们都是在基带用数据处理的办法产生角误差信息,都具有同时跟踪多目标的能力。本文着重讨论了2种系统的跟踪模块的设计与算法,给出了多目标跟踪的仿真结果;多目标测控与通信,给出了基于数字波束形成DBF及数字匹配滤波器—码分多址（DMF-CDMA）技术的多飞行器测控系统。仿真证明本文提出的方法与系统是可行的。     

创新发展,和谐共赢——就CIMT2007的主题采访吴柏林总干事长

第10届中国国际机床展览会（CIMT2007）将于2007年4月9-15日在北京国际展览中心举行。CIMT展会自创办以来，就以‘集结世界机械制造技术与装备之精华，展示机械制造领域技术的新高度，汇合世界机床市场多方位信息的大潮汛，推动中国机械制造业和机床工具工业的技术进步与生产力发展’为目的，在每届展会上，通过不同的展会主题来诠释中国机床工具工业协会这一办展目的，并体现‘交流技术、加强合作、扩大贸易、共同繁荣’的办展宗旨。     

标准化、现代化、敏捷化与成组技术

讨论了机械制造业中标准化工作对制造业现代化和敏捷化的重要性,阐述了机械产品结构的模块化、系列化和标准化与产品创新和敏捷制造的关系,强调了成组技术对实现敏捷制造的作用。     

Metal-on-metal bearings surfaces: materials, manufacture, design, optimization, and alternatives

When first introduced, total hip replacements offered pain relief and improved mobility in elderly patients. The success of this procedure in terms of long-term durability and restoration of function has led to its use in younger, more active patients. This has resulted in a commensurate increase in patient expectation regarding longevity and the degree to which function and lifestyle is restored. The bearing surface is a key feature of the performance of replacement joints. It is generally accepted that excessive amounts of wear debris preclude their long-term survivorship and hence there is an ongoing requirement for bearing surfaces which minimize debris generation. The purpose of this paper is to review the factors which affect the performance of so-called metal-on-metal bearings, to compare their performance with that of the other commonly used contemporary alternatives, metal and ceramic articulating against highly cross-linked polyethylene, and ceramic-on-ceramic, and finally to consider the potential solutions offered by new developments such as ceramic-on-metal and coatings applied to metal-on-metal bearings.     

在线式小视场大量程高精度红外热像系统研究

本文针对工业上使用的红外热像系统精度低、高量程需要扩展、视场较大、价格昂贵等缺点,结合比色测温原理,设计了一套在线式小视场大量程高精度红外热像系统,并对测温系统的结构进行了详细描述,对滤光片的选择算法进行了阐述.     

Lymphatic function, lymphangiogenesis, and cancer metastasis

The lymphatic system serves as the primary route for the metastasis of many cancers and the extent of lymph node involvement is the most important indicator of tumor aggressiveness. Despite the apparent importance of the lymphatic vessels for tumor dissemination, it has remained unclear whether activation of lymphatic endothelial cells may affect tumor progression and metastasis and the molecular mechanisms of lymphangiogenesis are just beginning to be elucidated. This overview describes the unique structural and functional characteristics of the lymphatic vessels that render them particularly suitable for invasion by tumor cells and for their efficient transport to lymph nodes. Recent evidence indicates occurrence of tumor lymphangiogenesis and its correlation with metastasis. Molecular regulation of tumor lymphangiogenesis, its significance for tumor metastasis, and implications for cancer therapy are discussed.     

The Wear of Copper,Aluminum, Mild Steel,and Zinc,and Their Wear Particle Shape Factors

Unlubricated, highly loaded sliding experiments were conducted for systems of mild steel, copper, aluminum, and zinc. Load is critical in determining the wear mode. A Cocks wedge mechanism is the primary method of wear for copper, and for aluminum until a critical temperature is reached. The wear of steel is characterized by the formation of small un-joined fragments.

The surfaces of wear particles were of two types; copper showed one type, and aluminum, mild steel, and zinc the other.

Wear particle shape can be characterized by the ratios of dimensions (L/W) and (L/H). These factors are easily determined to good accuracy, and have distributions which are both far different in form and mean values for the various metals. The mean values of the shape factors are independent of particle size, and of each other.

Surface roughness is not related to wear particle size for highly loaded sliding.     

轮胎模具的设计，测试，制造，设备检测和人员培训

在德国和捷克共和国建有工厂的AZ Formen及Maschinenbau GmbH公司,作为模具和模具闭合系统的制造商40年多年来一直服务于38个国家的轮胎工业。     

工业设计与产品、企业、市场

在未来的时代中,成功的企业是最大限度的发挥工业设计的软作用的企业,是追求产品,企业,市场三位一体最佳化的企业。这一方面要求工业设计要使企业去主动的认识市场,分析市场,引领市场的发展方向,而不要被动的去趋从于市场的潮流;另一方面要求企业要高度的重视工业设计,为工业设计的发展创造良好的内部环境。