A structure model of nano-sized domain in Gd-doped ceria

Nano-sized domains have been widely observed in rare-earth-doped ceria, but their structure model remains unclear. In this work, based on the study of high resolution transmission electron microscopy (HRTEM) and selected area electron diffraction (SAED) of Gd-doped ceria, the structure model of the domains was constructed by a combination of defect clusters with oxygen vacancy chains. Then, the SAED patterns were simulated using this structure model. The simulated results are consistent with the observed SAED patterns.     

Classification and enumeration of matched free response matrices of linear finite automata

IfH andG are the transfer function matrix and the free response matrix of a linear finite automaton, thenG is called a free response matrix matched toH. GivenH, letG(H) be the set of all possible free response matrices matched toH. A classification and an enumeration on the setG(H) are given in this paper. Supported by National Natural Science Foundation     

Effect of 1,2-propanediol on the vapor-liquid equilibria of the ethyl acetate + ethanol system at 101.3 kPa

Vapor-liquid equilibrium (VLE) data for the system ethyl acetate + ethanol in the presence of 1,2-propanediol at concentrations of 0%, 20%, 30%, and 40% by weight were measured at 101.3 kPa. The experimental VLE data of the ternary system ethyl acetate + ethanol + 1,2-propanediol were correlated by the Margules, Wilson, NRTL, and UNIQUAC liquid models. The relative volativities of ethyl acetate with respect to ethanol were also determined. The results of the investigation indicate the disappearance of the binary azeotrope between ethyl acetate and ethanol at the solvent concentrations studied in this work.     

一类随机不可微规划的实施方案

本文给出了一类随机不可微规划的实施方案。数字实验表明，这种实施方案是可行的。     

Compact efficient diode-pumped Nd:YVO4 Q-switched blue laser with intracavity frequency tripling

We demonstrate a compact efficient diode-pumped acousto-optically Q-switched intracavity-frequency-tripled Nd:YVO₄ blue laser. The optimum polarization state is experimentally investigated to optimize the output performance. Greater than 280 mW of 447-nm average power at a repetition rate of 25 kHz was generated with a 15-W diode pump power. At 25 kHz, the pulse width is shorter than 15 ns and the peak power is higher than 800 W.     

维生素C或H_2O_2系统中HO~·对DNA的损伤作用

采用紫外分光光度法、ＴＢＡ法、琼脂糖凝胶电泳法检测维生素Ｃ或Ｈ２Ｏ２体系对ＤＮＡ的作用，发现ＤＮＡ在２６０ｎｍ处吸光值下降，检测到ＤＮＡ的脱氧核糖损伤，观察到ＤＮＡ链降解．痕量的过渡金属离子Ｆｅ２＋等能加速上述反应的进行，各种ＨＯ·清除剂可抑制上述反应．表明在上述两类反应体系中产生了ＨＯ·，是ＨＯ·破坏ＤＮＡ的碱基和脱氧核糖，降解ＤＮＡ链     

Study on the Reaction of Proteins with 5＇-Nitrosalicylfluoronemolybdenum（VI） Complex by Spectrophotometry in PVA 124 Microemulsion

The application of 5′‐nitrosalicylfluorone (5′‐NSF)‐molybdenum(VI) complex as a spectroscopic probe was studied. In the buffer medium of HOAc‐NaOAc at 3.45 and in the presence of PVA 124 microemulsion, 5 '‐NSF‐Mo(VI) complex combines protein rapidly to form a stable compound. leading to an absorbance decrease at 525 nrn of 5′‐NSF‐Mo(VI) complex. According to this change, microdetermination of protein has been described. Bovine serum albumin (BSA) could be determined in the linear range of 0–16 pg*mL with the detection limit of 11 ng*mL^?1. Many amino acid and metal ions studied do not interfere with the assay. The method possesses high sensitivity as well as high selectivity. It can be used to determine protein in human urine and milk powder successfully. The relative standard deviations are in all instances less than 4.7%. and the recoveries are between 97.6% and 106.0%. Moreover, the binding number of BSA with the complex, which is determined by using molar ratio, Rosenthal graphic and slope ratio methods, is in good agreement with each other.     

线性方程组Ax=b的反问题的一般解

给出了线性方程组Ax=b的反问题在n阶矩阵类中解的一般形式．     

红外反射法研究6H-SiC表面热氧化生长的SiO_2特性

本文利用红外反射峰位置与薄膜厚度及密度的关系研究了在SiC衬底上热氧化生长出的SiO2在退火前及在不同温度用高N2退火一小时后的1085cm-1附近红外反射峰的漂移情况,分析了SiO2的密度变化。密度的变化反映了退火中SiO2中的C和CO的扩散以及空位型缺陷的退火过程。     

植物甾醇乙酰化过程中高效液相色谱法的测定

应用高效液相色谱法对混合植物甾醇乙酰化过程的产物进行了测定。实验采用的色谱柱为 HypersilODS反相柱 (4 .6× 15 0 mm,5 μm) ,流动相为甲醇 ,紫外检测波长为 2 10 nm,恒溶剂洗脱的操作条件。实验结果表明 ,混合植物甾醇及其乙酸酯的响应时间小于 2 5 min,且各种甾醇及其酯的分离效果较好。采用该方法能够快速、准确地对植物甾醇酯化反应进行的程度及酯化产物含量进行测定。