材料期刊网，材料期刊，材料类期刊，材料期刊投稿

对丰中子晕核11Li的核电荷均方根半径的实验确定, 特别是其与9Li的半径的差值, 将对各种核模型进行灵敏的检验. 选择锂的合适跃迁, 利用激光光谱技术高精度测量该跃迁的同位素移位, 并扣除精确理论计算的质量移位贡献值, 可以用来确定有关同位素的核电荷均方根半径. 就目前能够提供的实验设备和手段, 对于不稳定锂的同位素8,9Li和短寿命丰中子晕核11Li而言, 这是能够得到与核模型相独立的电荷半径值的唯一可行的方法. 这类实验正在德国重离子研究中心(GSI)和欧洲核子中心的ISOLDE/CERN 上计划实施.描述了锂原子的激光激发共振电离途径和进行锂的同位素移位测量的实验装置, 并讨论了采用这种方法测量到的6,7Li的初步结果及其精度, 以及使用该方法研究不稳定核的灵敏性.

关键词: 晕核 , 同位素移位 , 电荷半径

Preparation of I_2 Clusters and Their Absorption Spectra

Zhaojun LIN , Zhanguo WANG , Wei CHEN and Lanying LIN(Lab. of Sendconductor Materials Science , Institute of Semiconductors , Chinese Academy of Sciences , Beijing 100083 , China)

材料科学技术（英文）

Samples have been prepared at different temperatures by loading I2 molecules into the cages of zeolite 5A, and the measurements of the absorption spectra have been carried out for the prepared samples. It is shown that I2 molecular clusters are formed in the cages of zeolite 5A,and it is also found that moIecuIar clusters which are bonded with intermoIecuIar forces have an important feature, namely, the intermolecular distance in molecular clusters can be changed on different preparing conditions and the blue shift of absorption edges can not be as the criterion of forming molecular clusters.

关键词:

Galvanostatic electrodeposition and microstructure of copper (I) oxide film

Materials Research Innovations

Polycrystalline copper (I) oxide films were deposited on stainless steel substrate by galvanostatic electrodeposition method and were characterized by Xray diffraction and scanning electron microscopy. The effect of bath temperature, bath pH and current density on the compositon, grain size, surface texture and surface morphology of the electrodeposited films were investigated. The films deposited at low bath pH (less than or equal to 7) consisted of copper (I) oxide and metallic copper; while the films deposited at bath pH between 8 and 12 and bath temperature of 60 degrees C were pure copper (I) oxide. The preferred orientation of the copper (I) oxide films depended on the relative growth rate of (111) and (200) faces and could be controlled by adjusting the bath pH and/or the cathodic current density. (100)-oriented copper (1) oxide films could be deposited at pH=9 and current densities in the range of 0.25-1 mA/cm(2) while (111)-oriented films could be prepared at pH=12 or at pH=9 using the current densities between 1.5-2.5 mA/cm(2). Computer simulated crystallite shapes showed that the crystal shape changed from octahedral for (100)-oriented film to trucated pyramids and cubs for (111)-oriented film. And they were approved by scanning electron microscopy.

关键词: copper(I) oxide;electrochemical deposition;thin films;microstructure;electrochemical synthesis;thin-films

Mode I and mixed mode I/II fatigue cracking in Ni3Al(CrB) single crystals

Fatigue & Fracture of Engineering Materials & Structures

Nominal mode I and mixed mode I/II fatigue tests were carried out using the intermetallic compound Ni3Al(CrB) in the form of single crystal specimens. The effects of crystal orientation and load mode on fatigue crack initiation and growth were studied. The fracture surfaces of the single crystals were characterized by a cleavage-like appearance and cracking occurred either on a single {111} plane or on multiple {111} planes irrespective of whether mode I or mixed mode I/II loadings were applied. It was found that the crack initiation and growth behaviour are dependent on both crystal orientation and applied loading mode. The cracking behaviour predicted by three mixed mode fracture criteria (MTS, SED and G criteria) in polycrystalline materials under mixed mode loading can be understood from the present results on single crystals.

关键词: fatigue cracking;mixed mode loading;crystallographic orientation;resolved shear stress;Ni3Al(CrB) single crystals;growth;alloy

正常形变带[521]1/2的ΔI=1颤动

吴崇试 , 潘奕

原子核物理评论 doi:10.3969/j.issn.1007-4627.2002.01.001

系统分析了A≈170区正常形变带[521]1/2-中的ΔI=1颤动现象. 根据旋称伙伴带的跃迁能量提取Δ2 Eγ (I)=[Eγ(I)+Eγ(I-2)]/2-Eγ(I-1)值, 表现出旋称相关的规则上下颤动. 其颤动幅度在低自旋端约为50 keV, 而后随自旋而增大或减小, 大体呈抛物线形. 利用改进的ab公式, 提取了相关的脱耦合系数. 运用Nilsson波函数, 探讨了原子核集体哈密顿量中高阶微扰项的可能形式.

关键词: 正常形变带 , 旋称伙伴带 , ΔI = 1颤动 , 脱耦合效应 , 改进的ab拟合

采用UF法精制I+G产品

张国俊 , 许赵辉 , 刘忠洲

膜科学与技术 doi:10.3969/j.issn.1007-8924.2002.02.010

采用截留分子量(MWCO)1万的卷式超滤膜和截留分子量(MWCO)6 000的中空纤维超滤膜,去除I+G粗品液中影响I+G产品透光的色素、大分子蛋白及可溶性胶体蛋白,不需加碳、压滤等工序,产品透光合格率达100%,产品透光的合格稳定性较现有生产工艺大大提高,该工艺不仅可以省去加碳压滤等工序,而且可以保证产品一次性达到合格产品.

关键词: 肌苷酸 , 鸟苷酸 , 超滤 , 透光