ICP-AES法测定钕铁硼镀镍溶液中的杂质元素含量

建立了用电感耦合等离子体发射光谱法(ICP-AES)测定钕铁硼材料镀镍溶液中镉、锰、铬、铜、铁、钙、锌、铝、钴、钕、镨和铈12种杂质元素含量的方法;确定了仪器的最佳工作参数及各元素的分析谱线;通过采用基体匹配和简单的镀液稀释消除了电镀液中大量存在的基体物质对待检测元素测定的光谱干扰。实验结果表明：本方法中12种待测元素线性关系良好,线性相关系数R>0.999,检出限为0.005～0.690μg/mL,精密度和回收率实验结果表明,本方法具有简便、快速、准确的优点,能够满足日常钕铁硼镀镍溶液中杂质元素的快速检测要求。     

对抽油机井井下漏失问题的研究

油田进入高含水开发阶段后,机械采油成为采油生产主要开采方式。抽油机井能否正常生产,直接关系到产量指标的完成。近几年,由于漏失造成抽油机井检泵大幅度上升,给我矿的机采管理工作带来了较大的困难。本文通过对正常生产时抽油泵工作过程和三相流体在井下管柱和井口流动过程的阐述,结合现场的实际情况,对可能产生漏失的原因进行分析。应用示功图、沉没度、产液薰、含水、电流、压力等多项生产数据对漏失部位进行综合诊断,使对漏失的检查和处理有的放矢,同时提出针对漏失问题的预防措施。     

Nd∶YAG激光辐照碳纤维复合材料的质量烧蚀

 通过实验研究了连续Nd：YAG激光辐照下碳纤维环氧树脂复合材料的质量烧蚀规律。结果表明：当激光功率密度大于 10 kW/cm2 时,材料烧蚀质量与激光辐照能量成正比关系;在同样激光辐照能量下,半径为0.65mm的激光辐照引起的复合材料的质量烧蚀率比半径为5.5mm的激光辐照的结果大一倍;激光功率在燃烧阈值附近时,燃烧现象引起质量烧蚀率的波动。     

扁平化时代风格的族群演进:2013——2020 年

目的探索扁平化时代下中国移动端界面的风格旅群演进情况，描绘了2013- 2020年间主流界面风格的发展全 貌及其演进机制。方法从扇平化风格三源头的关系辨析出发梳理了扇平化时代到来后20余种主流设计风格的成因、特征、分类、流变和相互关系,并沿着3条演进脉絡展开论证:第一，“伪扇平”时代经历了“选择适应期"“视效丰富期"和“质料表达期”3个阶段，其新生风格主要源于突破“扇平面本体”的设计规则限定;第二,基于扁平化风格要素,衍生出“复古初期特征”及“表达技法仿拟”2个风格组团;第三,新复古主义风格则平行架空于磨平化之上，与肩平化呈现出此消彼长的态势。上述风格发展遵循扁平化与报物化矛盾统一的底层逻辑,并呈现出“物竞天择”“适者生存”的进化论特征。结论风格演进的内因受社会观念与申美异化驱动,外因则与传播媒介发展有关。未来基于碎片化“风格模因”的合成风格流行将是一大趋势,公众将成为新风格的创造主体。     

变频器节能降耗原理及其应用研究

主要介绍高压变频器的工作原理、调速性能和节能作用,指出高压变频器在工业企业应用中取得较好的经济效益和社会效益,具有广阔的应用前景。以及我单位高压变频器在一次除尘中的应用。     

浅析公路沥青路面碾压施工的质量控制

路面的最终成品是碾压出来的,无论用哪种设计方法．沥青混合料通过现场碾压工艺取得高性能的路面是关键。无论是马氏击实还是旋转压实所成型的沥青混凝土检测的指标,不能完全接近汽车行驶于路面要求的使用性能。所以,通过现场施工工艺取得高性能沥青路面是关键。本文主要介绍了公路沥青路面碾压施工质量控制的方法。     

一种新型复合材料吸声的理论建模与仿真

建立了压电陶瓷/橡胶复合材料吸声的理论模型,给出了机电类比等效电路,数值仿真分析了材料参数变化时,电损耗效率和吸声系数的变化趋势.     

Green函数对饱和土隧道内集中荷载作用振动位移反应的计算

由于快速列车与城市地铁的发展,饱和土隧道内集中荷载作用的反应问题日显重要。Green函数对辐射条件的满足,积分方程的精确解答,Dirichlet条件下的通用性,使它对隧道内动荷载作用的土动力反应问题计算有着特有的优越性,作者根据已求得两相饱和介质Green函数,利用Lamb积分公式,结合隧道断面特征,以解析积分法推导了集中冲击荷载与简谐荷载圆形断面隧道内振动位移反应表达式闭合解、反应时程曲线、瞬态和稳态的振动形态;并根据它们的单位脉冲响应函数结合Duhamel积分求得隧道在地震荷载作用下的动力反应。另外窗形隧道受集中冲击荷载作用相关弹性波时程曲线也在文中给出。     

Kano模型在中国设计学研究中的应用

目的 全面分析Kano模型在我国设计学领域文献中的应用现状及全局特征。方法 以 CNKI收录的设计学领域Kano模型相关应用文献作为数据源,以科学文献计量可视化的方法综合运用VOSviewer和CiteSpace从文献的年份产出分布、研究机构、作者和     

浅谈磁粉检测设备的原理及应用

本文对牵引电机转子磁粉检测的工艺要求及设备进行了介绍和分析，对设备的原理、性能特点、工作过程等进行了阐述。实践证明，选用的设备使用情况良好。     

Estimation of Parameters of Universal Distribution of Moments of Failure of Products

A method is proposed for estimating the parameters of a mixture of exponential and Weibull distributions for which the accuracy of preliminary estimates obtained by graphical analysis is refined in accordance with the criterion of maximum likelihood. The efficiency of the proposed method is supported by the results of statistical modeling.     

Evaluation of optical properties of highly scattering media by moments of distributions of times of flight of photons

A novel method for the determination of the optical properties of tissue from time-domain measurements is presented. The data analysis is based on the evaluation of the first moment and the second centralized moment, i.e., the mean time of flight and the variance of the measured distribution of times of flight (DTOF) of photons injected by short (picosecond) laser pulses. Analytical expressions are derived for calculation of absorption and of reduced scattering coefficients from these moments by application of diffusion theory for infinite and semi-infinite homogeneous media. The proposed method was tested on experimental data obtained with phantoms, and results for absorption and reduced scattering coefficients obtained by the proposed method are compared with those obtained by fitting of the same data with analytical solutions of the diffusion equation. Furthermore, the accuracy of the moment analysis was investigated for a range of integration limits of the DTOF. The moment analysis may serve as a comparatively fast method for evaluating optical properties with sufficient accuracy and can be used, e.g., for on-line monitoring of optical properties of biological tissue.     

Analysis of the rate of propagation of the wave of change of boiling modes

An approximate analytical expression is derived for the velocity of the front of the wave of change of boiling modes on a rod and on a plate. The impact of the Thomson effect and of the heater orientation in the gravity field is included. Adequate agreement is demonstrated between the derived relations and experimental data.     

Estimation of potentialities of methods of summation of direct measurement errors

Conventional methods for summation of direct measurement errors are considered. Conditions under which these methods provide consistent results are stated. It is proposed to utilize for characteristic of the total error, its interval estimator or the half-sum of the value obtained by adding up its arithmetic and geometric random errors.Translated from Izmeritel'naya Tekhnika, No. 4, pp. 10–12, April, 1995.     

空压机轴承箱蜗壳温度探头油封改造

由于空压机进气侧轴承箱蜗壳温度探头密封效果不好,使空压机及其后续管道受到油污染。后将温度探头的O形圈密封改为骨架油封,杜绝了轴承箱漏油问题。文章简介空压机的结构和技术参数,详细介绍了骨架油封的制作和优点。     

Characteristics of mechanical properties of materials in studies of conditions of attainment of marginal states

It is shown that conditions of attainment of marginal states in the material of structural components are formulated on the basis of analysis of force and deformation criteria of formation and development of destruction. The parameters of these criteria are data on types of structural materials, standard and special characteristics of their mechanical properties, structural forms of considered elements of the equipment, and their operating stress loading. In this case, the construction of a system of state equations for describing interrelation of current damage, external actions, and responses to them is based on the concept of calculating variations in properties of materials at all stages of the design life cycle.     

Determination of parameters of microstructural inhomogeneity of deformation of metals by the method of modeling

The article suggests a method of evaluating the microstructural inhomogeneity of deformation of metals by modeling. The method includes the measurement of deformations of metal according to meshes of a dividing grid with small base and the calculation of the distribution parameters of microdeformations in model representation. It is shown that the modeling method makes it possible objectively to evaluate the microinhomogeneity of deformation of metals independently of the chosen mesh size of the dividing grid. New structural characteristics are introduced: the base and wave of variation expressing the degree of crumbling or amalgamation of metal grains by inhomogeneity of deformation.Translated from Problemy Prochnosti, No. 7, pp. 40–44, July, 1991.     

水三相点复现的不确定度评定

水三相点是开尔文热力学温度的唯一基准点，也是ITS-90国际温标重要的定义固定点。因此，水三相点不确定度分析对整个温标的建立、温度量值传递起着至关重要的作用。近3年来，中国计量科学研究院研制出一系列高质量的水三相点容器，加强了水三相点的研究，为不确定度的分析提供了更为可靠的实验依据。同时，不确定度的分析也是客观评价新研制容器性能的一个重要指标。因此，根据实验结果对新研制容器所复现的水三相点进行了不确定度评定。评定结果表明，其扩展不确定度为0．16mK(k=2．69，P=0．99)。