润滑脂的差热分析

润滑脂质量测定，通常采用红外光谱分析的方法。红外光谱主要基于物质分子吸收从红外光源来的具有一定能量的光子，由于这些光子被吸收，在光谱中就呈现一系列红外吸收谱带。该方法以涂KBr压片进样，测定快速、简便，但润滑脂质量的红外光谱分析也存在一些问题。一是很难在复杂的润滑脂红外吸     

应用傅里叶变换红外-衰减全反射法和差示光谱法研究甲烷磺酸铜的红外光谱

分别用衰减全反射法 ,石蜡糊差示光谱法及KBr压片法测定了甲烷磺酸铜的红外光谱。通过对结果的对比得出了结论 :甲烷磺酸铜在用KBr压片法制样时发生了固相反应 ,表现为 -SO2 -的不对称伸缩振动吸收峰发生了变化。     

粉末试样压片机两种常见故障的排除

769YP-15型粉末试样压片机是红外分光光度计压制 KBr 薄片的专用设备.在使用过程中,KBr 薄片粘连模具和油泵漏油是两种常见的故障.现根据我们的经验,对故障排除方法作一简单介绍.(1)KBr 薄片牢固地粘在模具硬质合金压片上,不能自行脱落。这种情况主要屉由于压片上出现许多小麻点引起的,而这些麻点又     

光谱学在有机导体研究中的应用

有机电荷转移复合物的光谱表征对于了解样品的电子结构、电性能和单晶结构相的归属是一种行之有效的手段。本文报道了我们在这方面所做的一些工作:(BEDT-TTF)_3Cl_2(H_2O)_2、(BEDT-TTF)_2、Cl(H_2O)_3的KBr压片的从中红外到可见、紫外区域的光谱和(BEDT-TTF)_5Cl_3(H_2O)_5的红外偏振光谱图。这些工作对于这些有机导体的进一步研究很有帮助。     

环磷酰胺制剂的红外光谱测定法

本文介绍了以溴化钾压片法测定环磷酰胺粉针剂、片剂的红外光谱法。以1050cm~(-1)(P-O-C键)为测定吸收带,按基线法求取不同浓度的吸收度直接制作标准曲线并由此求取样品含量,方法操作简便、专一、重现性好,平均回收率为97.3％,标准差:1.92％,变异系数:4.52％。     

用NaCl代替KBr作红外光谱固体样品压片的分散介质

用廉价的分析纯ＮａＣｌ代替光谱纯ＫＢｒ作为红外光谱分析的固体样品压片的分散介质，两者的空白和实际样品的红外光谱基本相同，适当增压片厚度，可克服ＮａＣｌ压片易碎的弱点。     

含水物质红外光谱测试的样品制备

介绍了含水物质红外光谱测试中常用的样品制备技术 ,包括结晶压片法、吸附压片法、蒸发涂片法、蒸发成膜法、液池参比法等     

镜面反射及其在高聚物研究中的应用

<正> 随着傅里叶红外光谱技术的发展,近年来一些新的红外附件如红外显微镜、光纤探头等也快速地发展起来。这些红外附件的应用使红外样品的制备变得十分简单。但是由于价格上的原因,上述附件的使用受到极大的限制。 用于常规的红外分析的样品通常是采用溶液法,薄膜法和溴化钾压片法来制备的。在高聚物研究中,固体的高分子样品主要是采用溶液铸膜或     

太赫兹技术对营养品中蛋白质含量的研究

采用太赫兹时域光谱(THz-TDS)和红外光谱分析技术,研究了3种奶粉、杏仁粉和白砂糖的光学性能和光谱特性。通过对比样品在1658 cm-1和1747 cm-1处的红外光谱吸收峰,可以判定蛋白质和脂肪含量的差别。对比样品在THz波段的吸收系数和折射率,蛋白质含量较高的样品其吸收系数和折射率较高。观察样品的红外吸收峰强度和位置难以定量分析样品的蛋白质含量,但可以利用样品在THz波段的吸收系数与折射率有效地判定营养品中蛋白质的含量。实验结果表明蛋白质在太赫兹波段比在红外波段有更好的区分性,THz-TDS技术有望为营养品中蛋白质含量检测提供一种有效的分析手段。     

用红外干涉法测量砷化镓外延层的厚度

红外干涉法测量砷化镓外延层厚度是一种较迅速、准确,而又无损的方法。此法一般是用于低阻材料的厚度测量。利用 H800红外分光光度计及 NaCl 或 KBr 棱镜进行测量。测量原理红外干涉法是利用在外延层表面入射的光反射后所呈现的红外干涉条纹,然后根据这些干涉条纹计算而得厚度的。但这样的干涉必须在一定的条件下进行。如外延层的表面要求平     

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.