ELISA法测定组胺的不确定度评定

根据JJF1059-1999《测量不确定度评定与表示》规范对ELISA法测定组胺的不确定度进行评价分析,分别计算各分量的不确定度,进而计算合成不确定度。取k=2(置信概率95%),当样品rA17的组胺浓度为11.47μg/mL时,移取溶剂相对不确定度为0.015μg/mL,重复性试验相对不确定度为0.0395μg/mL,曲线拟合的相对不确定度0.021μg/mL,合成相对标准不确定度为0.047μg/mL,其扩展不确定度为1.08μg/mL,建立适合ELISA法测定组胺浓度的不确定度分析。     

顶空-气相色谱法测定汽车内饰材料中挥发性有机物总量的不确定度评估

对顶空-气相色谱法测定汽车内饰材料中挥发性有机物总量(VOC)的不确定度进行评估。依据JJF1059.1—2012《测量不确定度评定与表示》和JJF 1135—2005《化学分析测量不确定度评定》相关规定,建立数学模型,分析不确定度的来源,对不确定度分量进行量化和合成,计算扩展不确定度。结果表明,汽车内饰材料中VOC总量为15μg C/g时,其扩展不确定度为1μg C/g(k=2)。     

动物源食品中β受体阻断剂残留量测定的不确定度评定

建立了液相色谱-串联质谱(LC-MS/MS)法测定动物源食品中β受体阻断剂残留量的数学模型,依据影响测量结果的不确定度来源,如标准溶液配制、样品称量、回归方程、方法重复性等,对各个不确定度分量进行评定和分析,给出了0.5μg/kg检测水平下,液相色谱-串联质谱法测定食品中β受体阻断剂残留量的相对合成标准不确定度以及扩展不确定度。通过比较各分量不确定度,发现实验过程中最小二乘法拟合带来的不确定度影响最大。     

原子吸收法测定水样中铅含量的测量不确定度评定

根据GB/T7475-1987,使用原子吸收光度法测定水质样品中铅的含量,按照JJF1059-1999《测量不确定度评定与表示》的要求对测定结果进行不确定度评定。分析测定过程中不确定度来源,计算各不确定度分量,求出合成不确定度和扩展不确定度,给出测定结果报告。当样品铅含量为1.31 mg/L时,测量结果的扩展不确定度为0.05 mg/L,k=2。     

石墨炉原子吸收法测定地表水中钒的不确定度评定

对石墨炉原子吸收分光光度法测定地表水中钒的不确定度进行分析讨论,建立不确定度的评定方法.根据测量不确定度的评定理论,分析了整个检测过程的不确定度来源,研究了不确定度的评定步骤和计算过程.通过推导计算,给出了扩展不确定度,地表水中钒的扩展不确定度为1.2μg/L,从而评定了石墨炉原子吸收法测定对水中钒浓度的测量结果不确定度.     

电感耦合等离子体质谱法对车用陶瓷催化转化器中铑测量的不确定度评定

利用电感耦合等离子体质谱(ICP-MS)法测定车用催化转化器中铑的标准方法,评定相应的测量结果的不确定度。通过对测定过程中不确定度分量来源的分析,计算各不确定度分量,最后计算出合成标准不确定度和扩展不确定度,以测量不确定度的形式对测量结果进行表述。得出:催化器样品中铑含量为(1.968±0.051 0)mg/g,t_(0.95)(12)=2.18。     

标准曲线法测定猪肉中盐酸克伦特罗含量不确定度的分析

讨论标准曲线法测定猪肉中盐酸克伦特罗的不确定度分析。通过对影响样品测试结果的不确定度分量的分析和量化,求出各分量对测量结果不确定度的相对贡献,得出被测量(猪肉中盐酸克伦特罗)的合成标准不确定度和扩展不确定度分别为u=0.27μg/kg和U=0.54μg/kg,并对测量结果进行表述:16.41±0.54μg/kg。如实反映测量的置信度和准确度。     

原子荧光光度计测定水中总汞的不确定度的评定

本文依照标准文件的原则对原子荧光光度计测定水中总汞的不确定度进行评定。笔者提出利用校准曲线的残差来量化曲线拟合带入的不确定度分量。这不仅减少工作量而且更符合监测工作实际,使评定程序更具可操作性。经评定,原子荧光法测定总汞水样(1.00μg/L)的扩展不确定度为3.0%。     

液相色谱法测定乳饮料中阿司帕坦含量的不确定度分析

采用高效液相色谱法对乳饮料中阿司帕坦含量的不确定度进行评估。根据JJF 1135—2005《化学分析测量不确定度评定》和JJF 1059.1—2012《测量不确定度评定与表示》中的有关规定,建立测定乳饮料中阿司帕坦含量不确定度的数学模型。根据不确定度的传播规律,逐层分析不确定度来源,对不确定度分量进行量化和合成,计算出相对和扩展不确定度。实验结果表明,乳饮料中阿司帕坦含量为0.118g/kg时,扩展不确定度为0.006g/kg(k=2)。不确定度的最大来源是拟合标准工作曲线产生的不确定度。     

红外光谱法测定精TiCl_4中CS_2结果的不确定度评定

采用红外光谱法测定了精TiCl4中CS2的含量并对测定结果进行了不确定度的评定。红外光谱法测定精TiCl4中CS2含量为6.60±0.082mg·kg-1。对标准储备液的配制、标准溶液的配制、标准曲线校正、样品重复性测定、仪器示值所引起的不确定度分量进行了评定,并计算出合成标准不确定度和扩展不确定度。结果表明,标准系列溶液的配制和标准曲线的拟合是引入不确定度的主要来源,在实验中应特别注意。     

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.     

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.