环境监测仪器和技术的新进展

介绍了国内，外环境监测仪器和技术的最新进展，其中包括有机污染物和无机污染物监测，水和气的自动监测系统。重点介绍了以酶联免疫（ELISA）法为基础的检测；以紫外吸收、红外吸收为基础的大气污染物自动监测，室内致癌物的监测等。并对倍受各国关注的大气中PM2．5的标准制定，监测方法和原理，以及用INAA法、PIXE法，XRF法对大气颗粒物成分的分析测定等进行了介绍。目前MS已成为痕量环境污染物监测的重要手段，本文还介绍了几种MS的种类，应用情况，如GC—TOFMS、GC—MS—MS、LC—TOFMS、LC—MS—MS、同位素稀释ICP—MS在环境监测中的应用。     

法医毒物毒品分析的利器

随着分析技术的不断发展，法医毒品毒物的分析检测技术也有了快速发展。应用的仪器和技术也越来越丰富。其中液相色谱一串联质谱（LC—MS／MS）方法以灵敏度和选择性极高等优点受到广泛关注。文章以案例分析的形式详细介绍了这种法医毒品毒物检测的最新技术。[编者按]     

赛默飞推出仪器控制软件——用于实现蛋白质组学数据独立采集的组合式质谱仪

9月28日,赛默飞世尔科技推出用于Thermo Scientific Q Exactive高性能四极杆一轨道阱LC—MS／MS的全新数据独立采集（DIA）蛋白质组学功能。新型DIA功能使QExactivew质谱仪选择宽广的m／z窗口并在该窗口中裂解所有母体,从而采集样品中所有离子的MS／MS谱图,使仪器能够在单次运行中对样品中几乎所有已检测的肽段进行定量。     

赛默飞推出用于组合式质谱仪的仪器控制软件

近日,赛默飞世尔科技推出用于Thermo Scientific Q Exactive高性能四极杆-轨道阱LC—MS／MS的全新数据独立采集（DIA）蛋白质组学功能。新型DIA功能使QExactive质谱仪选择宽广的m／z窗口并在该窗口中裂解所有母体,从而采集样品中所有离子的MS／MS谱图,使仪器能够在单次运行中对样品中几乎所有已检测的肽段进行定量。     

利尿剂氨氯吡咪,苄硫噻嗪和三胺喋啶的LC／MS分析

国际奥委会规定检测的利尿剂采用甲基化和硅烷化后进行GC/MS确证分析。目前国际上用LC/MS对这类药物进行确证分析的报道不多,主要原因是LC/MS分析灵敏度不高。本文就上述问题对不同流动相和离子化试剂做了一些灵敏度对比研究实验,分别对标准品和阳性尿进行了LC/TS/MS分析,得到比较理想的结果。为进一步提高灵敏度,还需对流动相、离子化试剂等做更深入的研究。     

杀鼠药氟乙酰胺和氟乙酸钠LC/MS/MS分析

要建立了液质联用法（LC／MS／MS）测定杀鼠剂中氟乙酰胺和氟乙酸钠的方法。此二种药物由于具有价格便宜、合成简单、无色无味等特点，因此在中国被广泛非法使用。过去采用GCMS方法对其进行检测，但由于需要衍生化，所以费时费力，其衍生物也对测定产生干扰，本文采用LC/MS／MS方法同时对氟乙酰胺和氟乙酸钠进行了检测，方法快速、灵敏且不需要衍生化。     

液相色谱—质谱法（LC—MS）分析细胞色素C酶解肽谱及一级结构

本文采用液相色谱—质谱联用法（LC／MS）,对一种蛋白质—细胞色素C（Cyt．C）的胰蛋白酶酶解产物进行了质量肽谱分析,确定了各肽段在蛋白质中的位置。并用串联质谱（MS／MS）分析了大部分肽段的序列,均获得满意的结果。     

激情、机遇、极致、积极——天瑞仪器质谱仪系列新品媒体发布会侧记

3月19Et,“天瑞仪器2012质谱仪系列新品媒体发布会”在北京召开。江苏天瑞仪器股份有限公司董事长刘召贵博士携研发及市场高层出席,向数十家行业网站、媒体介绍其自主研发的3款质谱仪产品：GC—MS6800气相色谱．质谱联用仪、LC—MS1000液相色谱质谱联用仪、1CP—MS2000电感耦合等离子体质谱仪。     

机械传送带高压液相色谱/质谱联用的操作条件

高效液相色谱(LC)适用于分析热不稳定、强极性、难挥发的有机化合物,在有机化学、生物化学、药物化学等领域中得到广泛应用。而质谱(MS)作为一种检测和鉴定技术,具有通用性及灵敏度高的特点,采用各种质谱技术,可获得化合物的许多结构信息。这两种技术的结合(LC/MS联用),是当代最重要的分析技术之一。LC/MS联用接口的主要技术要求是(1)流动相挥发、排除、实现样品富集。(2)溶质不受损失,     

生物检材中乌头碱、次乌头碱、新乌头碱的LC/MS/MS分析

目的 建立生物检材中乌头碱、次乌头碱、新乌头碱LC／MS／MS分析方法。方法用氨仿／乙醇（9：1．pH=9）革取生物检材样品，采用电喷雾离子源,正离子MRM扫描。结果本方法线性相关系数r≥0．9957，结论：LC/MS／MS法灵敏可靠，样品处理快速简便，适用于生物检材中乌头碱、次乌头碱、新乌头碱的检测。     

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.