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新产品·新成果BMS—1型便携式棉花测色仪浙江大学光材系与郑州棉麻加工研究所共同研制成功的BMS－1型便携式棉花测色仪已通过技术鉴定。该仪器用于测定棉花颜色特性，是集光、机、电、微机于一体的精密仪器。仪器根据色度学原理设计，并应用标准板建立了用于棉花色泽分级的均匀颜色空间。仪器设计合理、结构小巧、操作简便。该仪器的研制成功，填补了国内空白，其主要技术指标达到美国同类产品的水平．由于仪器在棉花检验中有着广泛的应用前景，因此具有较大的社会和经济效益。（沉涵芬）ZG－9000型显微高速摄影系统浙江大学光科系最近…     

迭代目标转换因子分析法辅助分光光度法同时测定大米中痕量镧、铈和钕

在ｐＨ２．０时,Ｌａ（Ⅲ）Ｃｅ（Ⅳ）和Ｎｄ（Ⅲ）均与ＣＰＡⅢ发生高灵敏的显色反应,形成稳定的二元络合物,其λｍａｘ分别为６７３．６７３和６７０ｎｍ,表明吸收光谱严重重叠;在相应λｍａｘ处,其表观摩尔吸光系数分别为７．６０＊１０＾４、６．７６＊１０＾４和７．８０＊１０＾４Ｌ．ｍｏｌ＾－１．ｃｍ＾－１。本文采用迭代目标转换因子分析法辅助分光光度法对模拟样和大米样中痕量镧、铈和钕进行了同时测定。结果具有满意的准确度和精密度。     

用快速分光光度法（水溶或萃取）测定硅酸盐岩矿中的钛

发展了一种用２．３－二羟萘（Ｈ２ＮＤ）作发色剂的灵敏且有高度选择性的水溶以及萃取分光光度法来测定Ｔｉ（１Ｖ）。在ｐＨ４￣９时，该试剂（Ｈ２ＮＤ）形成１：３（ＴｉＯＨ＾３＋：配位体的络合物。在λｍａｘ×３７５ｎｍ时摩尔吸收率与Ｓａｎｄｅｌｌ灵敏度分别为３．２×１０＾４ｌ．ｍｏｌ＾－１·ｃｍ＾－１和０．００１μｇ／ｃｍ＾２。发现该法对于测定岩矿样品中的Ｔｉ（１Ｖ）具有高度选择性。以乙酸乙酯溶剂萃取Ｔｉ     

用DBHQ非萃取分光光度法测定合金和环境,生物和土壤样品中的钒（V）

本文介绍一种在稍微酸性的溶液（０．０００１５－０．０１６ｍｏｌ＾－１Ｈ２ＳＯ４）中，用５．７－二溴－８－羟基喹啉（ＤＢＨＱ）作新型分光光度试剂，快速测定钒（Ｖ）的超灵敏和高选择的非萃取分光光度法。反应是瞬时的，吸光度保持稳定超过４８ｈ。发现平均摩尔吸收系数和Ｓａｎｄｅｌｌ灵敏度分别为６．１×１０＾３ｌ ｍｏｌ＾－１ｃｍ＾－１和０．０１５μｇ ｃｍ＾－２Ｖ（Ｖ）。获得了０．１－２０μｇ ｍｌ＾－１（     

棉花色泽仪的研制

棉花色泽仪的研制＊林敏叶关荣（深圳大学深圳５１８０６０）（浙江大学杭州３１００２７）１引言颜色作为评价棉花质量的指标之一已有二百多年历史了,当然,这主要是通过分级员的眼睛来确定的。但是,人眼只能比较测量两个颜色的差别,而不能对颜色进行绝对测量,因此目...     

流动注射光度法测铁的研究：Fe（Ⅲ）—5—Br—PADAP—EtoH显色体系

用自行组装的ＦＩＡ装置，对Ｆｅ（Ⅲ）－５－Ｂｒ－ＰＡＤＡＰ－ＥｔＯＨ显色体的三种流路进行了系统的研究，选择了最佳的ＦＩＡ流路方式及其工作条件，拟订了Ｆｅ（Ⅲ）的ＦＩＡ光度法，测定前需用Ｈ２Ｏ２将Ｆｅ（Ⅱ）氧化成Ｆｅ（Ⅲ）用于总铁量的测定。方法的线性范围，检测限及采样速度分别为０－１．４ｍｇ．ｌ＾－１，０．００４ｍｇ．ｌ＾－１和９０样次．ｈ＾－１。该方法用于天然水或某些工业用水中总铁量的测定，结果满     

用便携式MIPID气相色谱仪现场测定空气中的苯,甲苯和乙烯

利用便携式微波等离子体离子化检测器（ＭＩＰＩＤ）气相色谱仪，以氩气为载气和工作气体，测定了空气中的苯、甲苯和乙苯。考察了各种实验参数对测定的影响。探讨了苯系物电离电位与离子化效率及检出限的关系。对苯、甲苯和乙苯的检出限分别为４．０×１０＾－１１ｇ，２．５×１０＾－１１ｇ和１．２×１０＾－１１ｇ。     

二苯偶氮碳酰肼间接光度法测定废水中的氰化物

在硝酸介质下,汞（Ⅱ）与二苯偶氮碳酰肼及ＯＰ形成蓝色络合物,氰化物使蓝色络合物褪色,从而建立了测定氰化物的间接光度法,λｍａｘ＝５４０ｎｍ,氰化物在０－２０ｕｇ／２５ｍｌ范围内符合比耳定律,其表观摩尔吸光系数为ε＝３．０＊１０＾４Ｌ．ｍｏｌ．ｃｍ＾－１。     

流通池光谱电化学法

建立了一种电解池置于光谱仪器之外的流通池光谱电化学法。对实验装置的结构和实验方法作了说明。用该法研究了Ｆｅ（ＣＮ）６＾３－／Ｆｅ（ＣＮ）６＾４－和邻联甲苯胺体系，测定了式量电位Ｅ°′和电子转移数ｎ，结果与文献值一致；还测定了Ｆｅ（ＣＮ）６＾３－／Ｆｅ（ＣＮ）６＾４－体系的热力学常数△Ｓ°和△Ｈ°。     

用快原子轰击质谱研究醌式化合物Medermycin,G—15F和G—15G

Ｍｅｄｅｒｍｙｃｉｎ，Ｇ－１５Ｆ和Ｇ－１５Ｇ三个化合物都有醌式结构，在底物甘油中，准分子离子为（Ｍ＋３Ｈ）＾＋但在底物３－硝基苯甲醇（ＮＢＡ）中，准分子离子为（Ｍ＋Ｈ）＾＋，本文用ＦＡＢＭＳ对此作了研究。     

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.