离子色谱、毛细管电泳及毛细管电泳离子色谱发展概况

毛细管电泳离子色谱是近年来发展迅速的一种分离检测技术,在无机阴阳离子检测方面有着广泛的应用前景。文章综述了离子色谱和毛细管电泳的发展概况,阐述了毛细管电泳离子色谱的研究现状。     

离子色谱分离技术的现状及其展望

简述了近年来离子色谱分离技术的发展状况,重点介绍了化学抑制型离子交换柱的研究新进展以及在样品分析方面的应用。提及了离子色谱仪硬件的一些新发展和新概念——只加水和电极化的离子色谱床。     

离子液体在天然产物化学中的应用

首先介绍了离子液体的发展历史以及离子液体的种类、特点、制备方法,重点综述了离子液体在天然产物提取分离中的应用,主要分析了离子液体微波辅助萃取分离、离子液体超声强化萃取分离以及离子液体双水相萃取分离方面的研究进展,并指出了离子液体在天然产物提取分离的应用中存在的问题,介绍了两种改进方法——固定化离子液体和聚离子液体技术。其次概括了离子液体在色谱分析中的应用,包括气相色谱、高效液相色谱及毛细管电泳。最后对离子液体在天然产物中的应用进行了总结与展望,指出了其所面临的挑战及未来的研究方向。     

第三届全国离子色谱学术交流会征文通知

中国仪器仪表学会分析仪器学会离子色谱专业委员会定于1991年下半年召开第三届全国离子色谱学术交流会,拟参加者请将论文于1991年3月30日(以邮戳为准)前寄北京934信箱,候小平收,邮政编码100083、一、征文内容离子色谱在各领域的最新研究成果,包括基础理论研究、分析方法、仪器和柱填料的研制以及具体应用等方     

第四届全国离子色谱学术报告会在上海召开

第四届全国离子色谱学术报告会于1993年11月11日至13日在上海召开,来自全国30多个科研院所、大专院校、生产厂家和应用单位的50多名代表出席会议。会议共收录学术论文48篇。与会代表就离子色谱的现状和发展前景进行了广泛的交流和讨论。 随着新型离子交换柱填料的发展,IC技术已成功地扩展到多种基体中有机和无机离子的测定,应用领域不断扩大,发展前景十分广阔。从交流的学术论文可以看出,我国离子色谱的研制能力和应用研究水平也有了较大的提高,主要表现在以下两个方面:     

离子色谱的最新进展和几个热点应用

自1975年第一台商品化的离子色谱仪问世以来，离子色谱的仪器有了长足发展，离子色谱的应用领域也由最初的无机阴阳离子分析拓展到更宽的范围。本文对离子色谱技术的最新进展-只加水技术进行了总结，并对离子色谱几个最新的热点应用进行了介绍。     

离子色谱在食品和农药残留分析中的应用

离子色谱已经成为无机阴、阳离子和部分有机离子最主要的分析方法,在食品、医药、生化、农业等领域得到了广泛应用.本文着重介绍目前最新的离子色谱技术及其在食品、农药等方面的分析应用情况.     

气相色谱-离子迁移谱联用检测毒害气体研究

离子迁移谱检测技术是现场检测毒害气体的重要方法,具有快速响应,灵敏度高等优点。现场快速的气相色谱分离结合离子迁移谱检测可以获得多维的分析信息,色谱突出的分离特点使分析的准确性大大增加。本文介绍了当前现场快速色谱与离子迁移等检测器联用的技术的优点,详细研究了相关的技术发展概况,分析了接口方法等主要影响因素,介绍了在毒害气体检测领域的应用进展。     

离子色谱在油田开发中的应用

运用离子色谱分析技术，对油田开发过程中油田水分析等方面进行应用研究，建立了油田水分析、防垢剂、化学示踪剂检测的离子色谱方法，该分析方法简便、快速、准确，可以应用到现场，对于油田开发具有很好的应用前景。     

离子色谱法的原理及其在水质分析中的应用

离子色谱作为一项新的分析技术,近年来发展迅速。本文简要介绍了离子色谱法的主要分离机理、独特的抑制技术以及一些色谱参数的选择,并综述其在水质分析中的应用。     

Minimal Realization of Linear Graph Models for Multi-physics Systems

An engineering system may consist of several different types of components,belonging to such physical"domains"as mechanical,electrical,fluid,and thermal.It is t...     

INTEGRAL EQUATION METHOD＇S APPLICATION IN HOLE-EDGE STRESS OF COMPOSITE MATERIAL PLATE WITH DIFFERENT SHAPED HOLES

The strength of composite plate with different hole-shapes is always one of the most important but complicated issues in the application of the composite material. The holes will lead to mutations and discontinuity to the structure. So the hole-edge stress concentration is always a serious phenomenon. And the phenomenon makes the structure strength decrease very quickly to form dangerous weak points. Most partial damage begins from these weak points. According to the complex variable functions theory, the accurate boundary condition of composite plate with different hole-shapes is founded by conformal mapping method to settle the boundary condition problem of complex hole-shapes. Composite plate with commonly hole-shapes in engineering is studied by several complex variable stress fimction. The boundary integral equations are founded based on exact boundary conditions. Then the exact hole-edge stress analytic solution of composite plate with rectangle holes and wing manholes is resolved. Both of offset axis loadings and its influences on the stress concentration coefficient of the hole-edge are discussed. And comparisons of different loads along various offset axis on the hole-edge stress distribution of orthotropic plate with rectangle hole or wing manhole are made. It can be concluded that hole-edge with continuous variable curvatures might help to decrease the stress concentration coefficient; and smaller angle of outer load and fiber can decrease the stress peak value.     

Non-monotonic material contrast in scanning ion and scanning electron images

30 keV Ga⁺ focused ion beam induced secondary electron (iSE) imaging was used to determine the relative contrast between several materials. The iSE signal compared from C, Si, Al, Ti, Cr, Ni, Cu, Mo, Ag, and W metal layers does not decrease with an increase in target atomic number Z₂, and shows a non-monotonic relationship between contrast and Z₂. The non-monotonic relationship is attributed to periodic fluctuations of the stopping power and sputter yield inherent to the ion–solid interactions. In addition, material contrast from electron-induced secondary electron (eSE) and backscattered electron (BSE) images using scanning electron microscopy (SEM) also shows non-monotonic contrast as a function of Z₂, following the periodic behavior of the stopping power for electron–solid interactions. A comparison of the iSE and eSE results shows similar relative contrast between the metal layers, and not complementary contrast as conventionally understood. These similarities in the contrast behavior can be attributed to similarities in the periodic and non-monotonic function defined by incident particle–solid interaction theory.     

Application of Feature Extraction through Convolution Neural Networks and SVM Classifier for Robust Grading of Apples

This paper proposes a novel grading method of apples,in an automated grading device that uses convolutional neural networks to extract the size,color,texture,an...     

分布动态载荷识别的抗噪处理

针对正交多项式频域法在用多种响应对矩形薄板进行载荷识别中抗噪性较差的问题,综合运用平均法、矩阵预处理和奇异值截断法等方法对之进行改善,并引入空间映射的思想,将该方法的应用范围拓展为复杂的模型.利用仿真算例,证实了该方法具有较好的抗噪性.     

基于MELTAC-N平台的核电厂安全级DCS环网研究与测试

针对工程实践中环网通讯相关问题的处理缺乏理论基础及国产化安全级DCS平台的开发缺乏成熟经验借鉴问题,对基于MELTAC-N平台核电厂安全级DCS环网的软硬件实现进行了研究。提出了安全级DCS环网双环网冗余设计、光切换开关设计等硬件设计方法,以及以RPR协议为基础,采用全数据收发策略的软件设计方法。在CPR1000安全级DCS平台上对安全级DCS环网的可靠性及实时性进行了评价,并进行了容错能力、响应时间及响应时间稳定性测试验证实验。结果表明,基于MELTAC-N平台安全级DCS环网软硬件设计具有较好的容错能力及响应时间稳定性。     

Short-Term Relay Quality Prediction Algorithm Based on Long and Short-Term Memory

The fraction defective of semi-finished products is predicted to optimize the process of relay production lines, by which production quality and productivity ar...     

End-to-End Multiview Gesture Recognition for Autonomous Car Parking System

The use of hand gestures can be the most intuitive human-machine interaction medium.The early approaches for hand gesture recognition used device-based methods....     

The laboratory simulation of abrasive wear

Abrasive wear has long been recognised as one of the most potentially serious tribological problems facing the operators of many types of plant and machinery; several industrial surveys have indicated that wear by abrasion can be responsible for more than 50% of unscheduled machine and plant stoppages. Locating the operating point of a tribological contact in an appropriate operational ‚map’︁ can provide a useful guide to the likely nature and origins of the surface degradation experienced in use, though care must be exercised in choosing the most suitable parameters for the axes of the plot. Laboratory testing of materials and simulations of machine contacts are carried out for a number of purposes; at one level for the very practical aims of ranking candidate materials or surface hardening treatments in order of their wear resistance, or in an attempt to predict wear lives under field conditions. More fundamentally, tests may be aimed at elucidating the essential physical mechanisms of surface damage and loss, with the longer term aim of building an analytical and predictive model of the wear process itself. In many cases, component surface damage is brought about by the ingress of hard, particulate matter into machine bearing or sealing clearances. These may be running dry although, more usually, a lubricant or service fluid is present at the interface. A number of standardised wear test geometries and procedures have been established for both two- and three-body wear situations, and these are briefly described. Although abrasive wear is often modelled as following an ‚Archard’︁ equation (i.e. a linear increase in material loss with both load and time, and an inverse dependence on specimen hardness) both industrial experience and laboratory tests of particularly lubricated contacts show that this is not always the case: increasing the hardness differential in an abrasively contaminated lubricated pair may not always reduce the rate of damage to the harder surface.     

Limits of topographic measurement by the scanning tunnelling and atomic force microscopes

Parameters describing the topographic character of a surface (height, surface wavelength, slope and curvature) can be derived from equivalent sinusoidal profiles. The response of a surface-measuring instrument may be modelled in terms of instrument parameters such as stylus radius, and scanning range and resolution. The performance of the instrument may then be mapped as a zone in amplitude-wavelength (AW) space to show the sinusoidal profiles it is capable of measuring. In a first-order analysis the STM and AFM are considered as equivalent to contact-stylus instruments with a notional stylus radius equal to the tip radius plus the gap. Comparisons between different instruments and types of instrument are readily made by mapping in AW space. The error arising from convolution of the sinusoidal profile with that of the finite tip may be quantified and plotted as contours in AW space.