顶空毛细管气相色谱法测定曲克芦丁中环氧乙烷残留量

建立了顶空毛细管气相色谱法测定曲克芦丁中环氧乙烷残留量的方法。环氧乙烷浓度在0．1～3．0μg／mL范围内,线性与精密度良好,平均回收率为100．6％,最低检出限为0．04μg／mL,线性方程为Y=10247．99c=539．76,相关系数为0．999。方法简便,结果准确。     

毛细管气相色谱法测定海参口服液中甲基汞的含量

本文建立了海参口服液中甲基汞含量的毛细管气相色谱测定方法。该法采用WBI进样口,毛细管色谱柱DB-5（弱极性,30m×0．53mm×0．5μm）,ECD检测器进行检测。进样口温度：200~C,载气流速：10mL／min,柱室温度：100℃保持2min,以5℃／min升至230℃．检测器温度：300℃。方法简单、快速、重现性好,平均回收率大于85％,RSD小于3．0％,线性范围为0．1μg／mL-1．0μg／mL。     

毛细管气相色谱法测定膨化食品中BHT、BHA的含量

本文建立了膨化食品中BHT（二叔丁基羟基甲苯）、BHA（丁基羟基茴香醚）含量的毛细管气相色谱测定方法。该法采用WBI进样口,毛细管色谱柱FFAP（强极性25m×0．53mm×1μm）,FID检测器进行检测。进样口温度：230℃,载气流速：10mL／min,柱室温度：150℃保持3min,以30℃,min升至200℃,保持1min,再以10℃／min升至230℃,保持10min．检测器温度：250℃,样品用无水乙醇提取定容后直接进样测定。方法简单、快速、重现性好,平均回收率大于90％,RSD小于3．0％,线性范围为10μg/mL-200μg／mL。     

反相离子对色谱柱后衍生法测定生物组织中四种生物胺的含量

采用反相色谱柱后衍生法测定肌肉组织中的酪胺、亚精胺、腐胺和尸胺含量。样品经0．6mol／L的高氯酸溶液匀浆提取；流动相为10mmol／L的辛烷磺酸钠溶液（pH5．2）与0．1mol／L乙酸钠溶液一乙腈（pH4．5），流速1mL／min；柱后衍生液为0．1％邻苯二甲醛（OPA）溶液（pH10．5～11．0），流速0．5mL／min；Discovery C18分离柱和保护柱；荧光检测器的激发波长和发射波长分别为340nm和450nm；采用62rain的梯度洗脱程序；外标法定量测定。该方法在0．2～10μg／mL的浓度范围内具有良好的线性关系，酪胺、亚精胺、腐胺、尸胺的方法回收率在85．2％～103．3％之间，最低检测限为0．2μg／mL。     

气相色谱-火焰离子化检测器检测血清中乙二醇及其代谢产物羟乙酸

建立了气相色谱-火焰离子化检测器（FID）检测血清中乙二醇（ethylene glycol,EG）及其代谢产物羟乙酸（glycolic acid,GA）的方法。通过优化样本预处理和衍生化方法,用气相色谱-火焰离子化检测器检测标准工作液和小鼠中毒模型血清中乙二醇及其代谢产物羟乙酸。结果表明,乙二醇与羟乙酸浓度分别在0.01～10μg/mL,0.01～5μg/mL范围内线性良好,其标准曲线的相关系数分别为0.9999与0.9988,相对标准偏差均小于5%,绝对回收率分别为91～106%和89～95%,最低检出限分别为0.005μg/mL和0.01μg/mL。本方法灵敏度高,简单快速,结果准确可靠,适用于法医学鉴定和临床检验中乙二醇与羟乙酸的检测。     

液相色谱-串联质谱法测定食用油中的玉米赤霉烯酮

建立了固相萃取柱净化-液相色谱／串联质谱法测定食用植物油中玉米赤霉烯酮的方法。样品经正己烷稀释后,过氨基柱进行富集和净化,用液相色谱／串联质谱法进行分析。质谱法采用负离子扫描模式和多反应监测技术。在1．0～100．0ng／mL范围内,被测物浓度与峰面积呈线性关系（r=0．998）;在添加质量浓度为1．0～100．0μg／kg的玉米赤霉烯酮时,回收率≥90．0％,相对标准偏差〈3．5％,检出限为1．0μg／kg。该法简便、快速、准确,可用于食用油中玉米赤霉烯酮的测定。     

气相色谱-质谱法同时测定蜂蜜中的双甲脒及其代谢物残留

建立了一种用气相色谱．质谱法(GC-MS)测定蜂蜜中的双甲脒及其代谢物(2，4-二甲基苯胺)残留的方法。蜂蜜样品用pH为11．0的水溶液溶解，其中的双甲脒和2，4-二甲基苯胺残留用正己烷超声波提取后直接用GC-MS测定。样品添加浓度在10μg／kg～200μg／kg时，双甲脒和2，4-二甲基苯胺的添加回收率在60％～120％之间，检出限均为10μg／kg。     

依诺沙星在胶束体系中的荧光特性研究及应用

文章研究了依诺沙星在胶束体系中的荧光性质，发现十二烷基硫酸钠(SDS)对依诺沙星有较强的增敏作用，据此建立了胶束增敏荧光光度法测定痕量依诺沙星的新方法。经标准样品测定，依诺沙星浓度在0．03μg／mL～0．6μg／mL范围内与荧光强度呈良好的线性关系，检测限为0．01μg／mL，回收率为96．7％～99．2％，相对标准偏差为2．2％～3．9％。该法用于依诺沙星片剂的含量测定，结果令人满意。     

毛细管气相色谱法测定培哚普利中有机溶剂残留量

建立了毛细管气相色谱内标法测定培哚普利中甲醇、乙酸乙酯、甲苯等有机溶剂残留量的方法。以苯为内标,样品用二甲基亚砜溶解直接进样测定,色谱柱为CP—SIL8CB毛细管柱（30m×0．25mm×1．0μm）。有机溶剂残留添加回收率在98．1—100．8％之间,有机溶剂残留的最小检出限在0．1～0．25μg／mL之间。该方法具有快速、准确、操作简便等特点,能满足培哚普利中甲醇等有机溶剂残留量的定量检测。     

液相色谱串联质谱法测定谷物中二乙酸镳草镰刀菌烯醇

采用内标法，建立了液相色谱串联质谱法（LC／MS—MS）ESI＋测定谷物中的二乙酸镳草镰刀菌烯醇的方法。对比了液液革取与Micostep226、Micostep225、C185种SPE柱对样品前处理的效果，其中Micostep225SPE柱净化样品具有较好的回收率。标准工作曲线范围在0．1～100．0ng／mL之间，检出限为0．02ng／mL。对大米粉、面粉与玉米淀粉二乙酸镳草镰刀菌烯醇浓度为1．0～10．0ng／g合成样品的回收率在70．1％～82．7％之间，相对标准偏差在6．7％～9．5％之间。该方法快速、简单、灵敏度高。     

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.     

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....     

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。     

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.     

ANGULAR DISTORTION ALLOWABLE VALUE AND ASSESS METHOD OF WELD ON COKE TOWER

A graph as the new engineering method for estimate the safety of bulging deformation of coke tower is proposed. Through stresses analysis of circumferential weld of coke tower and comparing the stresses produced by pressure with heat stress of steady state, residual stress, bending stress produced by both itself weight and wind loads, it showed that the stresses produced by pressure on the angle distortion are the main factor of equivalent stress of the combined stress. After comparing four kinds of stress controlling conditions, the relation to stress with depth of angular distortion, grade of curvature of angular distortion and half of region of angular distortion has been inferred. Graph of deformation allowable value of coke tower for different condition by angular distortion and half of region of angular distortion has been plotted. The five steps for its engineering use have been explained. The lighter the grade of curvature is, the larger of bulge allowance, may be, and the bigger of depth of angular distortion may pose too. For the coke tower with a popular structure of Dg 5 400 mm×28 mm, the result by graph is nearly more than the result of two formulas formed by other research, the error is less than 7.0%. But, the graph can be easily applied to different size of angular distortion.