储氧材料制备过程中的结构及织构变化

Ce_0.65Zr_0.35O₂ solid solution was prepared by co-precipitation method and characterized by X-ray diffraction (XRD), Raman spectra, BET, oxygen storage capacity (OSC) and temperature-programmed reduction measurements (H₂-TPR) after calcination at 100 ℃, 300 ℃, 600 ℃, and 1 000 ℃. The results showed that the precipitation was a crystalline of fluorite structure, and in the process of the precipitation transformation into Ce_0.65Zr_0.35O₂ solid solution, the fluorite structure of the precipitation kept unchanged. The samples had different BET surface areas and OSC at different temperatures, but they held the performance of stable structure. After 1 000 ℃, there didn′t appear the other crystalline phase. So the samples prepared by co-precipitation method had excellent texture and higher thermal stability.     

新型一维梯状双链配位聚合物{[Cu(malate)(2,2'-bipy)]•3H2O}∞的合成、晶体结构与表征

合成了铜(II)与羟基丁二酸和2,2'-联吡啶形成的配位聚合物{[Cu(malate)(2,2'-bipy)]•3H₂O}_∞ (其中malate＝羟基丁二酸根, 2,2'-bipy＝2,2'-联吡啶), 通过X射线衍射测定了单晶结构, 并进行了元素分析、红外光谱、紫外光谱、热分析等研究. 配合物属单斜晶系, 空间群P2(1)/c; 晶胞参数: a＝0.70132(10) nm, b＝1.9730(3) nm, c＝1.18998(16) nm, β＝94.551(3)°; Z＝2; 最终偏离因子R＝0.0483. 配合物中每个铜(II)原子与来自2,2'-联吡啶的两个氮原子和两个羟基丁二酸根的三个氧原子配位, 形成畸变的三角双锥结构单元. 每个羟基丁二酸根以R构型方式桥联两个三角双锥结构单元, 沿a轴方向无限延伸形成一维链. 两条平行链以面对面的方式重叠, 彼此吡啶环之间存在强的(-(相互作用, 加之C_吡啶环—H…O_羧基弱相互作用形成新颖的梯状双链结构, 比邻的梯状双链又通过分子间O_羟基-H…O_羧基氢键沿a轴方向共同构筑了具有隧道的三维结构.     

IMT2000及其候选方案比较

ＩＭＴ２０００及其候选方案比较国家数字交换系统工程技术研究中心单睿，熊谨煜，刘萍，胡捍英，鲁国英１扩频通信与ＩＭＴ２０００在现代信息社会，移动通信技术在日益改变着人们的工作方式与生活观念。８０年代初正式运营的第一代模拟通信系统无论在技术还是通信质量方...     

Modified (2+1)-dimensional displacement shallow water wave system and its approximate similarity solutions

Recently, a new (2+1)-dimensional shallow water wave system, the (2+1)-dimensional displacement shallow water wave system (2DDSWWS), was constructed by applying the variational principle of the analytic mechanics in the Lagrange coordinates. The disadvantage is that fluid viscidity is not considered in the 2DDSWWS, which is the same as the famous Kadomtsev—Petviashvili equation and Korteweg—de Vries equation. Applying dimensional analysis, we modify the 2DDSWWS and add the term related to the fluid viscidity to the 2DDSWWS. The approximate similarity solutions of the modified 2DDSWWS (M2DDSWWS) is studied and four similarity solutions are obtained. For the perfect fluids, the coefficient of kinematic viscosity is zero, then the M2DDSWWS will degenerate to the 2DDSWWS.     

广义耦合KdV孤子方程的达布变换及其奇孤子解

借助谱问题的规范变换, 给出广义耦合KdV孤子方程的达布变换,利用达布变换来产生广义耦合KdV孤子方程的奇孤子解,并且用行列式的形式来表达广义耦合KdV孤子方程的奇孤子解．作为应用,广义耦合KdV孤子方程奇孤子解的前两个例子被给出．     

Drift vortices in inhomogeneous collisional dusty magnetoplasma

For the sake of investigating the drift coherent vortex structure in an inhomogeneous dense dusty magnetoplasma,using the quantum hydrodynamic model a nonlinear controlling equation is deduced when the collision effect is considered.New vortex solutions of the electrostatic potential are obtained by a special transformation method, and three evolutive cases of monopolar vortex chains with spatial and temporal distribution are analyzed by representative parameters. It is found that the collision frequency, particle density, drift velocity, dust charge number, electron Fermi wavelength, quantum correction,and quantum parameter are all influencing factors of the vortex evolution. Compared to the uniform dusty system, the vortex solutions of the inhomogeneous system present richer spatial evolution and physical meaning. These results may explain corresponding vortex phenomena and support beneficial references for the dense dusty plasma atmosphere.     

新一代堆芯多群常数库制作系统的研制

随着新一代组件计算程序计算精度要求的不断提高,组件计算程序对配套多群常数库提出了更高的要求,例如:要求能群结构更加精细、共振参数更加多样、燃耗数据更加精确等。为满足新一代组件计算程序的这一系列需求研发了一套制作多群常数库的系统NPLC-3。NPLC-3系统以NJOY程序为中心包含了输入参数库、驱动程序、主库制作程序、并群、并库、删除、添加、进制转换、数据自动检验等功能模块,针对各功能模块采用不同方法初步验证了系统的正确性。相对传统的数据制作方法,NPLC-3系统在燃耗链设计、燃耗数据计算以及共振数据制作等方面增加新的特性,而且系统采用独立的I/O接口、全自动读取参数库并生成输入卡,相对过去制作数据库的手段有了很大的改进。With the unceasing enhancement of the calculation accuracy requirement on the new generation of lattice code, higher requirements on multi-group constants library were put forward. For example, fine energy group structures are required, more types of data are need for the resonance processing, more accuracy burn-up data is required. To meet this series of demand, a multi-group constants production system NPLC-3 was developed. The NPLC-3 system which mainly based on the NJOY program contains an input parameter database and a series of functional codes such as driver code, main library production code, energy group collapsing code, work library production code and so on. Recently, different methods were adopted to validate these codes respectively according to their functions. Compared to the traditional methods in multi-group constants production, NPLC-3 system adopts several new methods in the design of burn up chain, calculation of burn up data and resonance parameters. What's more, the NPLC-3 system has an independent I/O interface, and can fully automatic generate input cards from the input parameters database. Relative to the past means of production library, NPLC-3 system has great improvement.     

胶束电动毛细管色谱分析测定牛奶中的异油酸

为分析测定牛奶中异油酸(t11-C181)的含量,建立了毛细管电泳分析异油酸的方法。优化后的电泳条件为:缓冲液含4%(w/v)β-CD、54mmol·L-1 SDS、80mmol·L-1硼酸盐(pH 9.0)、8mol·L-1尿素和4%(v/v)甲醇,电泳电压为25kV、毛细管柱温为15℃。该方法测定异油酸在100~2 500μg·mL-1范围内的线性关系良好(R2=0.9817),检出限(LOD)为10μg·mL-1,平均加标回收率为95.6%。通过该方法测得市售牛奶中异油酸的含量为11.25mg·g-1乳脂。该方法不仅可以准确测定牛奶中的异油酸,而且可以同时检测牛奶中的主要共轭亚油酸异构体。更多还原     

基于网格的WEBGIS在中药材空间管理中的应用

本文指出了中药栽培在中医发展中的重要性并简单介绍了当前基于3S技术中药材空间管理信息系统在中药资源中的应用,构建了基于网格技术的WEBGIS的框架体系,并论述了其在中药材空间管理信息系统应用中的优越性.     

硼原子高Rydberg态能级研究

利用最弱受约束电子势模型理论,通过对最弱受约束电子的识别,将Martin公式推广到了多电子原子系统.依此研究了B原子的2s2np(n≥30)系列Rydberg能级,理论计算值与实验值吻合较好,二者的相对误差小于6.59×10-5,达到了很高的精度.