Cd掺杂量对Zn1-xCdxO合金带隙的影响

回顾了国内外Zn1-xCdxO合金带隙研究的发展历程,总结和归纳了近10年来关于Zn1-xCdxO合金中Cd原子分数x与Eg(eV)关系的数据及理论等研究成果.在此基础上,以近10年来文献中的试验数据作为分析样本,考虑多种情况对其进行回归拟合,并对不同拟合方法及Cd含量对Eg的影响进行了深入的分析讨论,建立了Cd含量x与Eg的经验关系式(x-Eg关系式).与试验值相比,使用新xEg关系式预测得到的Eg值与其符合得较好,表明所建立的关系式能比较准确地反映Zn1-x CdxO合金中Cd含量x与Eg之间的关系.     

Effect of Cd Content on the Band-gap of Zn1-xCdxO Alloys

回顾了国内外Zn1 -xCdxO合金带隙研究的发展历程,总结和归纳了近10年来关于Zn1 -xCdxO合金中Cd原子分数x与Eg(eV)关系的数据及理论等研究成果.在此基础上,以近10年来文献中的试验数据作为分析样本,考虑多种情况对其进行回归拟合,并对不同拟合方法及Cd含量对Eg的影响进行了深入的分析讨论,建立了Cd含量x与Eg的经验关系式(x-ER关系式).与试验值相比,使用新x-Eg关系式预测得到的Eg值与其符合得较好,表明所建立的关系式能比较准确地反映Zn1 -xCdxO合金中Cd含量x与Eg之间的关系.     

Lax Cey Prz Nd1-xy-z Ni3.55 Co0.75 Mn0.4 Al0.3储氢合金中稀土元素配比规律的研究

应用均匀试验设计法设计LaxCeyPrzNd1-x-y-zNi3.55Co0.75Mn0.4Al0.3(0＜x,y,z＜1)储氢合金的成分,通过大量的、统一的实验,来研究不同稀土配比的合金与其容量、电压、循环稳定性等电化学性能之间的关系,重点应用模式识别的人工智能方法分析实验数据并建立了相关的模型,结果显示出很好的规律性.     

形状因子对金属橡胶结构力学性能的影响

以多孔材料理论为基础,建立金属橡胶结构的力与位移关系,通过空心圆柱形金属橡胶结构力与位移关系试验,验证形状因子对材料结构的力学性能的影响,并对试验数据进行拟合,得到力与位移关系模型中各项系数与形状因子的变化关系式以及各项系数与材料结构的高度、承载面积的变化关系式,从而实现了对由金属橡胶材料所组成的结构在密度一定、形状因子发生变化情况下的力与位移关系的预估.     

LaxCeyPrzNdl—x—y—zNi3.55Co0.75Mn0.4Al0.3储氢合金中烯土元素配比规律的研究

应用均匀试验设计法设计LaxCeyPrzNdl-x-y-zNi3.55Co0.75Mn0.4Al0.3（0＜x,y,z＜1）储氢合金的成分,通过大量的、统一的实验,来研究不同稀土配比的合金与其容量、电压、循环稳定笥等电化学性能之间的关系,重点应用模式识别的人工智能方法分析实验数据并建立了相关的模型,结果显示出很好的规律性。     

Cu对C041Ni33Al26合金马氏体相变和磁性转变的影响

采用金相显微技术、DSC、VSM方法,研究了Cu含量x(x=3,5,8)对Co41Ni33Al26合金马氏体相变和Curie点的影响.结果发现在x≤5%范围内,Co41Ni33-xAl26Cux合金马氏体相变温度与x的关系成直线变化,x每增加1%,马氏体相变温度降低约44K;其Curie点随x增加而缓慢下降,x每增加1%,Curie点约降低3.6K.与L10马氏体结构的Co41Ni33-xAl26Cux(x=0,3,5)合金相比,具有B2结构的Co41Ni25Al26Cu8合金易磁化,并且饱和磁化强度低.     

La_(1-x)Y_xNi_(4.8)Mn_(0.2)合金的储氢性能

研究了元素Y(钇)对La_(1-x)Y_xNi_(4.8)Mn_(0.2)(x=0.6,0.7,0.8)合金储氢性能的影响,结果表明:La_(1-x)Y_xNi_(4.8)Mn_(0.2)合金为CaCu_5型六方结构;随着Y含量的增加,晶格参数a和晶胞体积V减小,而c几乎不变,c/a线性增大;随着Y含量的增加,合金的吸放氢平台压显著升高,吸氢量减少,吸放氢平台斜率S和滞后系数_f略有增加,滞后系数H_f与XRD(111)峰的半高宽(FWHM)值的变化有着很好的对应关系,抗粉化性能提高。当Y含量x=0.8时,合金的吸放氢动力学综合性能最好。     

SE电池电极制造过程中的硅片表面粗糙度对蜡滴铺展的影响

建立了蜡滴铺展系数与多晶硅片表面粗糙度的准则关系式,运用最小二乘法数据拟合方法得出了蜡滴铺展系数与相关参数的实验关系式。该实验关系式揭示了喷蜡蜡滴在多晶硅片上的铺展直径与多晶硅片表面粗糙度间的函数关系。     

Zr1-xTix(Ni0.6Mn0.3V 0.1Cr0.05)2(x=0～0.5)Laves相储氢合金的电化学性能

本文研究Zr1-xTix(Ni0.6 Mn0.3V0.1Cr0.05)2(x=0,0.1,0.2,0.3,0.4,0.5)系Lav es相储氢电极合金的气态P-C-T性能、晶体结构及电化学性能.XRD分析表明,Ti合金化使 Zr基储氢合金主相从C15相转变为C14相.当x>0.2时,第二相Zr7Ni10相消失, 并出现TiNi相.Ti合金化使Zr基储氢合金中C15相和C14相的晶格常数线性递减.气态P-C-T 测试表明,Ti合金化从x=0增加至x=0.5时合金的吸放氢平台压力升高约10倍,但降低了储氢合金的最大储氢容量.电化学测试表明,Ti合金化有利于改善Zr基储氢合金的活化性能, 这与Ti在KOH溶液中易于溶解有关,但过高的Ti含量降低了合金电极的循环稳定性.Zr1 -xTix(Ni0.6Mn0.3V0.1Cr0.05)2合金的电化学容量和高倍率放电性能均随合金中Ti含量的增加先上升后下降,这与合金的相结构组成有很大关系 .     

Fe-Si-B非晶雾化粉末去除Cd(Ⅱ)的机理研究

为了实现铁基非晶合金在净化重金属离子溶液技术这一领域的突破乃至应用,采用Fe-Si-B系非晶态雾化粉末研究了其对溶液中毒性较强的Cd(Ⅱ)的去除效果.结果 表明:反应过程中生成的Cd(Ⅱ)的相关产物说明该重金属离子的去除是一个还原与吸附并存的过程,且生成的反应拟合曲线符合伪一级动力学模型.通过研究不同环境因素对Fe-Si-B非晶态雾化粉末去除Cd(Ⅱ)的影响,发现去除效率与温度、粉末投加量呈正相关关系,与溶液中Cd(Ⅱ)的起始浓度呈负相关关系.pH值因素影响的结果说明在碱性环境中有利于Cd(Ⅱ)去除速率和去除率的提升.     

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.     

Assessment of intakes of mixtures of radionuclides

Australia has several uranium mines and a large number of mineral sand mines, with associated processing facilities. Exposures resulting from these mining and processing operations usually involve intakes of mixtures of radionuclides. This work describes the development of a suite of first order, linear compartment models, based on the ICRP Publication 66 respiratory tract model, and an analytical solution to the decay equations, for assessing the consequences of such intakes. The computer programs based on these models directly compute excretion, organ retention and organ and whole-body doses for intakes of either single radionuclides or any mixture of radionuclides belonging to the same radioactive decay chain. The intake can be via inhalation, ingestion or injection, and can be acute, chronic or of limited duration. The starting concentration and degree of secular (dis)equilibrium can be specified for each radionuclide. No assumptions need to be made about the relative magnitudes of the radioactive half-lives of the different nuclides.     

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.     

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.     

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。     

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.     

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.     

Analysis of anisotropy of properties on the basis of studies of texture of coarse-grained ingots of thermoelectric materials

An analysis of anisotropy of the properties of a Bi₂Se_0.3Te_2.7 solid solution was carried out using construction of demonstrative surfaces for thermoelectric effectiveness and thermal expansion coefficients. It is shown that the texture is an important factor forming anisotropy of properties and technological fitness of ingots for manufacturing modules. Anisotropy of properties based on the studies of the ingot textures obtained using the float-zone method and Bridgman method (growing thermoelectric plates in a flat cavity) was studied.