MOA油料光谱仪在鉴别真假润滑油中的应用

应用ＭＯＡ油料光谱仪，快速测定各元素含量，对比真假油数据，从而鉴定真假润滑油。该方法快速，准确，是一种实用价值较高的方法。     

真假醇酸树脂油漆的红外光谱鉴别方法

利用红外分光光度法与计算机联用来鉴别真假醇酸树脂油漆,通过获得的IR光谱,可清晰地观察到真假醇酸树脂油漆在结构上的差异,从而能够快速、准确地鉴别醇酸树脂油漆的真伪。     

佰元真假钞光谱和能谱的分析比较

通过傅立叶变换红外光谱仪、显微拉曼光谱仪以及电子探针/能谱仪等分别对真假佰元纸币进行测试,并对测试结果进行比较和分析,从光谱和能谱分析的角度比较真假佰元纸币的异同,为假币的鉴别提供另一种有效的方法。     

目前农村需要四种测定仪器

随着农业科学技木的发展和农副业生产水平的提高,目前农村需要四种测定仪器: 1.真假化肥测定仪。目前市场上真假化肥混杂。化肥经销单位和种田大户等急需要一种能测定真假化肥的仪器,以便迅速测定真假化肥及所含成分,避免上当受骗。 2.土壤肥力测定仪。由于土壤肥力不断     

振动系统时域动态识别的几个问题

在ITD方法[1]-[7]中,准确区分真假模态和精确识别模态参数是识别技术的两个关键问题。该法采用模态置信因子来区别真假模态[4][5],其准确度受测试数据中的噪声与测点个数的影响较严重。该法将最小二乘方程组化为法方程[4]来求解系统矩阵,增加了所求方程的病态性和不稳定性[8][9]。为此,本文进行了改进,借助于对不同序列频率值的比较来区别真假模态,当测点较少也有足够的可靠性,且测试噪声对频率的影响也最小。在算法上本文采用了改进的Gram－Schmidt正交化方法来求解识别计算中的最小二乘方程组,使识别精度有了提高。本文用FORTRAN77语言编制了识别程序,进行了若干试算,结果令人满意。     

解读《农药标签和说明书管理办法》判定农药的真实性

农药产品的包装标志及标签是农药产品的缩影,标识混乱的背后往往隐藏着许多假冒伪劣产品。通过农药标签和说明书判定农药的真实性,是广大农民朋友对农药产品最直接、最快捷、最有效的判别方式。文章详细阐述了农药标签和说明书所必须包含的全部内容,只要掌握了这些内容,农民朋友就能够快速识别出农药产品的真假,从而避免对农药使用者造成危害和损失。     

一种用于牙齿颜色测试的快速光谱仪

介绍了采用声光可谓滤光器 AOTF(Acousto～optic Turnable Filter)、光纤及计算机进行牙齿颜色测试的方法。这种方法测试速度快,全电控,体积小,测试精度高,可测试真假牙齿或假牙材料的颜色,在镶牙及假牙生产上有实际意义。     

农用土壤肥料养分测定仪研制

利用现代电子技术,采用液晶显示器,集成电路技术研制了一种低功耗、交直流两用的土壤肥料养分测定仪。与主机配套的有相应的测定土壤和肥料养分的化学试剂和器皿,仪器和配制的试剂构成了在农村测定土壤肥料的最小系统。实践证明：使用该测定仪能快速、可靠地测定出土壤、肥料中的养分含量,为在农村推广测土配方施肥和基层鉴别化肥真假奠定了坚实物质基础。     

真假农药的识别

从产品标签、包装、农药物质形态以及实验法等四方面入手，详细介绍了真假农药的识别方法。     

一种用于牙齿颜色测试的快速光谱仪

介绍了采用声光可谓滤光器ＡＯＴＦ（Ａｃｏｕｓｔｏ－ｏｐｔｉｃ Ｔｕｒｎａｂｌｅ Ｆｉｌｔｅｒ）、光纤及计算机进行牙齿颜色测试的方法。这种方法测试速度快，全电控，体积小，测试精度高，可测试真假牙齿或假牙材料的颜色，在镶牙及假牙生产上有实际意义。     

Elastic–plastic contact analysis of an ellipsoid and a rigid flat

The work presents a finite element model (FEM) of the equivalent von-Mises stress and displacements that are formed for the different ellipticity contact of an ellipsoid with a rigid flat. The material is modeled as elastic perfectly plastic and follows the von-Mises yield criterion. The smaller the ellipticity of the ellipsoid is, the larger the depth of the first yield point from the ellipsoid tip happens. The FEM produces contours for the normalized normal and radial displacement as functions of the different interference depths. The evolution of plastic region in the asperity tip for a sphere (k_e=1) and an ellipsoid with different ellipticities $(k_e=\frac{1}{2}\mathrm{and}\frac{1}{5})$ is shown with increasing interferences. It is interesting to note the behavior of the evolution of the plastic region in the ellipsoid tip for different ellipticities, k_e, is different. The developments of the plastic region on the contact surface are shown in more details in Fig. 7. When the dimensionless contact pressure is up to 2.5, the uniform contact pressure distribution is almost prevailing in the entire contact area. It can be observed clearly that the normalized contact pressure ascends slowly from the center to the edge of the contact area for a sphere (k_e=1), almost has uniform distribution prevailing the entire contact area for an ellipsoid $(k_e=\frac{1}{2})$, and descends slowly from the center to the edge of the contact area for an ellipsoid $(k_e=\frac{1}{5})$.     

The response to antioxidants in base oils of different degrees of refining

Base oils with different compositions and different degrees of refining have been subjected to three types of oxidation stability tests in the presence of antioxidants. A higher degree of refining of base oils depletes the natural antioxidants present in oils of lower degree of refining. However, the results of the study show that oxidation stability of highly refined oils, after addition of suitable antioxidant packages, by far outperforms that of the oils of lower degree of refining. This is true regardless of the dominating hydrocarbon type in the oil, or its feedstock origin. The results also show that in general, the viscosity index of a base oil, or any other simple physical property, has no direct correlation to oxidation stability or response to antioxidants. To analyse the response to antioxidants, a concept called oxidation stability response is introduced. A novel method for determining the oxidation onset temperature in differential scanning calorimetry measurements by inverse derivatives is introduced. Copyright © 2007 John Wiley & Sons, Ltd.     

Measurements of thermodynamic parameters for complexation between a tetra-aza macrocycle ligand and some metal cations based on conductometric method

Thermodynamic aspects of complexation process between 14-membered tetra-aza macrocycle ligand and four metal cations were studied in ethanol–water (EtOH–H₂O) binary mixtures at different temperatures by applying conductometric method. In all the cases, the stability constants (log K_f) of 1:1 formed complexes between ligand and cations were obtained by fitting the molar conductivity curves using the Genplot computer program and the formation constant values (log K_f) were generally in the range of 1.41–2.70. The values of thermodynamic parameters, standard enthalpy $(\mathrm{\Delta }{H}_C^{\circ })$ and standard entropy $(\mathrm{\Delta }{S}_C^{\circ })$ were obtained from the temperature dependence of the stability constants using the Van’t Hoff plots. Complexes in every cases were found to be entropy stabilized, and the selectivity order of all the complexes changes as well as the changes in composition of the solvent mixtures. The experimental data was tested by using artificial neural network (ANN) technique and was in a good agreement with estimated data.     

Classification of Multigrade Motor Oils at 0°F

Viscosities of polymer-oil blends do not plot as straight lines throughout the range of ASTM Viscosity-Temperature Chart D 341. One consequence is that SAE 10W/30 motor oils can be formulated from borderline 20W base stocks and high-potency V-I improvers. Compared to 10W/30 oils based on true 10W stocks, these anomalous representatives are relatively hard-starting at low temperatures. The heavy-base group can be excluded from the classification by specifying that the maximum extrapolated viscosity shall apply to sonic-irradiated rather than to new oils. This approach appears more attractive than published procedures based on the Brook-field and Ferranti-Shirley viscometers, or on identification of base stocks by dialysis.     

基于多传感器的智能火灾报警器的设计

同时采用烟雾传感器,温度传感器和火焰传感器来探测火灾现场。使用神经网络对多个传感器探测到的数据进行处理和识别。仿真结果表明。该多传感器的智能火灾报警器能够比较准确的识别火灾信号。准确性较高。误报率较低。