Abstract:After comparing many synthesis methods, we have developed an improved method of solid state synthesis to prepare zinc oxide nanoparticles. A surfactant was added into the reactive system in the process of the solid state synthesis, so that the product of

Abstract:The optical properties of nanoparticles with Cds/SiO_2 core/shell were investigated.The CdS core of narrow size distribution were produced by solid-state synthesis method in room temperature, and the surface of CdS nanoparticles were coated with a layer o

Abstract:探讨了氩弧焊工艺参数对镁合金焊接接头质量的影响，采用金相显微镜，对AZ31镁合金薄板TIG焊接接头进行了微观组织观察、用X-射线衍射仪等分析测试手段对相组成和力学性能进行了分析，结果发现：焊接电流为40A和45A时，焊接接头的力学性能最好，(σb为205MPa)，为母材强度的80％左右，断裂总是发生在热影响区，焊缝区组织呈细小的等轴晶，主要存在α-Mg和Mg17Al12两种相，热影响区组织较粗大。

Abstract:以Ce(NO3)3·6H2O为铈源,(NH-4)2CO3·H2O为沉淀剂,并加入少量PEG4000作为分散剂,采用液相沉淀法制备前驱体Ce2(CO3)3·H2O,前驱体经热处理合成了纳米CeO2.通过XRD,DTA/TG,TEM,BET及杂质含量分析,并根据XRD线宽法,按Scherrer公式计算平均晶粒尺寸,结合相对密度的测定研究了在不同热处理温度下纳米CeO2性能的变化.结果表明前驱体经300℃焙烧1 h已完全形成CeO2,属于立方晶系,空间群为Fm3m,原生晶粒粒径为5 nm左右,颗粒粒径为20 nm左右,比表面积达140.61 m2/g,孔径分布为5～15 nm,孔径峰值为9.3 nm,纯度≥99.97%;随焙烧温度提高,将引起CeO2晶粒尺寸和相对密度显著增大,比表面积减少.

Abstract:以Ce(NO3)3·6H2O为铈源,(NH4)2CO3·H2O为沉淀剂,并加入少量PEG4000作为分散剂,采用液相沉淀法制备前驱体Ce2(CO3)3·H2O,前驱体经热处理合成了纳米CeO2.通过XRD,DTA/TG,TEM,BET及杂质含量分析,并根据XRD线宽法,按Scherrer公式计算平均晶粒尺寸,结合相对密度的测定研究了在不同热处理温度下纳米CeO2性能的变化.结果表明:前驱体经300℃焙烧1h已完全形成CeO2,属于立方晶系,空间群为Fm3m,原生晶粒粒径为5nm左右,颗粒粒径为20nm左右,比表面积达140.61m2/g,孔径分布为5～15nm,孔径峰值为9.3nm,纯度≥99.97%;随焙烧温度提高,将引起CeO2晶粒尺寸和相对密度显著增大,比表面积减少.

Abstract:The electroelastic interaction between a piezoelectric screw dislocation inside a circular inclusion and an interfacial conducting rigid line in piezoelectric composite materials was dealt with in this paper. By using the analytical continuation principle

Abstract:Data from the deformation on Split-Hopkinson bar were used to construct an artificial neural network model and a Zerrilli-Armstrong model for shock-prestrained copper. The predicting precison of the two models were compared. It was found that the artifici

Abstract:从驾驶员心理学和生理学角度探讨了汽车夜间会车时眩目的机理．由于传统的前照灯配光设计停留在二维的层面上，设计周期长，且配光效果差，很难达到防眩目的要求．本文通过Reflector CAD软件反求出了符合ECE法规配光要求的自由曲面前照灯反射镜的三维模型，该模型可以直接用于数控程序的编制，减小了前照灯的设计成本和设计周期，利用TracePro软件对模型进行近光配光的仿真实验，通过光线追踪的方法避免了实际配光实验时调整反射镜配光所需的反复制造过程，同时又保证了前照灯防眩目的效果。

Abstract:On the assumption of conical keyhole and using geometrical optics theory, a detailed study on Fresnel absorption and multiple reflections on the keyhole wall in deep penetration laser welding of metals was made by tracing a beam light. On the basis of th

Abstract:In the diagnosis of (VLSI) and non-linear circuits ,there have always been difficulties in locating the faults and the diagnosis is very slow. This paper presents a new fault diagnosis method for VLSI based on Artificial Neural Network (ANN) and (GMTC) an

Abstract:This paper presents a T-S approaching method with Gauss subordinating function for one class of non-linear systems. According to the approaching error and control performance, a fuzzy adaptive controller was designed on the basis of Lyapunov stability th

Abstract:The control method of discrete frequency softstarter for three-phase induction motor is studied in this paper. The optimal combination pattern of the three-phase current supply system that can make motor start with a high torque and a small current is sel

Abstract:The maximum quantity of externally bonded strengthening materials of reinforced concrete structures depends on the type of members, the reinforcement ratio of the sections, the value of externally bonded strengthening materials and the strength grade of c

Abstract:This paper proposes a new method of building three-dimension prospective models for dams. Taking the topographic map generated by digital topographic models as the basic data, this method first adopts the elevation projection theory to build the mathemati

Abstract:An integrated parameter mathematical model, document data and matlab 5.0 software were applied to simulate and analyze the indoor contamination concentration of indoor porous dry materials,first-order decay source of dope and wall under different combin

Abstract:A plate structure is a structure made of several plates. For each plate, some edges are independent and can be calculated by boundary conditions, while some edges are connected by other plates and can be solved by continuous conditions. In this paper, Acc

Abstract:Based on the Talreja's damage model with tensor valued internal state variables for composites, the constitutive relations with damage of the plane stress problems for the uni-ply plate were derived. Then the constitutive relations with damage for the lam

Abstract:以湖南省1990-1999年的SO2监测和统计数据为基础,对湖南省排放SO2的现状进行了分析,计算了湖南省各地区SO2排放强度,并对湖南省今后SO2排放趋势进行了预测.结果表明,湖南省SO2污染最为严重的地带是处于沅江和澧水流域的吉首和洪江南北走廊带,其次是以长沙为中心的湘江谷地;排放强度最大的区域位于湖南省中部的娄底、湘潭和株洲等地,排放强度大于10.0 t/km2·a,其次是岳阳,排放强度在7.50～10.0 t/km2·a之间.预测结果显示,湖南省SO2排放量在2005年将达到77.15×104 t,到2010年将达到92.41×104 t.

Abstract:以湖南省1990-1999年的SO2监测和统计数据为基础,对湖南省排放SO2的现状进行了分析,计算了湖南省各地区SO2排放强度,并对湖南省今后SO2排放趋势进行了预测.结果表明,湖南省SO2污染最为严重的地带是处于沅江和澧水流域的吉首和洪江南北走廊带,其次是以长沙为中心的湘江谷地;排放强度最大的区域位于湖南省中部的娄底、湘潭和株洲等地,排放强度大于10.0t/km2·a,其次是岳阳,排放强度在7.50～10.0t/km2·a之间.预测结果显示,湖南省SO2排放量在2005年将达到77.15×104t,到2010年将达到92.41×104t.

Abstract:The software test becomes more difficulty when the number of testing use caseincreases, so it is very important to study testing use case. This paper first gives the definition of tree morphism, and then discusses the scale of use case for operating to a

Abstract:研究以数控机床ICAID系统中色彩设计过程为对象，进行了色彩意象尺度法实验和对设计者设计认知过程实验．通过心理量表测量、因子分析和口语分析，建立了数控机床产品的二维色彩意象认知空间，提出了色彩辅助设计过程模型框架．开发了配色器，并实现数控机床ICAID系统的产品色彩设计定义、检索、使用、修改的系统化应用．系统在互联网上得到了成功验证．

Abstract:得到了若干Mobius群中相应性质在(U)(1,n;C)中的推广,并由此建立了(U)(1,n;C)上的类Jorgensen不等式.利用此不等式得到了(U)(1,n;C)中有限生成子群的一条离散准则.

Abstract:针对Coifman与Tian等人关于Coifman型小波构造方法中长度与消失矩受到严格限制的缺陷，通过研究具有一般长度双正交特性的Coifman小波的长度与消失矩的关系，得到了一种构造一般Coifman型小波的有效方法．新型小波系数均含有自由变量，现有Coifman型双正交小波都可以通过取特殊长度以及特殊参数时得到，因此，我们的结果推广了Coifman与Tian等人的结果。

Abstract:We constructed a simple but applicable algebraic multigrid-preconditioned CG algorithm(AMG_CG)for the solution of the finite element equations of three dimensional elasticity problems. The related coarsing technique and the design of interpolation operato

Abstract:Quantum Mechanics is abstruse even to college students of physics. In our opinion, the best way to master Quantum Mechanics is to fully understand its five basic hypotheses. First, We presented a dice model, which can explain the five basic hypotheses of

Abstract:针对参数随机化情况下生产过程能力的评价问题，提出了一类新的过程能力指数．通过建立多元质量特性的数学模型，研究了正态-Wishan共轭先验分布下该模型的贝叶斯统计推断问题；根据模型协方差阵的后验分布、Wishart分布变量与多个分布变量之积具有相同的概率分布这一关系、以及正定阵之间变换的Jacobian行列式，推导了多元质量特性过程能力指数的后验概率分布，并据此构造了参数共轭先验分布下的多元贝叶斯过程能力指数及其单侧置信下限．与传统的过程能力指数相比较，贝叶斯过程能力指数更能准确地评价非稳定环境下的生产过程能力水平．

Abstract:在传统的汽车保险奖惩系统中，索赔次数是唯一的经验定价因素，但这不能真实地反映每位投保人的风险．针对这个问题，本文构建了一个同时考虑索赔次数和索赔事故责任比例两个因素的奖惩系统，并在假设任一保单持有人在以往年度的平均索赔事故责任比例服从[0，1]上的均匀分布的基础上，证明了这样构造的奖惩系统是最优的——能保持财务上的平衡。