Pb_(0.50)Sr_(0.75)Y_(0.70)Ca_(0.25)Cu_(1.70)O_y单晶的磁阻研究

对低掺杂区非超导的Pb_(6.56)Sr_(?)Y_(?)Ca_(?)Cu_(?)O_y单晶样品进行了电阻和磁阻的测量,发现在低温下电阻温度关系遵从变程跳跃传导的R=R_(?)exp[(T_(?)/T)~(?)]的变化规律,这说明该样品处于强局域化区域.在低温下的磁阻为负并有明显的各向异性,这表明这类体系的磁阻主要来自于轨道效应的贡献,并且可能受到自旋-轨道散射的影响.     

陨成分的分析

采用FI-IR红外光谱仪对德州清陨石的不同部位进行测定，确定了清陨石的组分和分类。     

Application of ^41Ca Tracer and Its AMS Measurement in CIAE

The man-made calcium isotope ^41Ca is an ideal tracer for the study of calcium metabolism. We represent the first application of accelerator mass spectrometry (AMS) measurement of ^41Ca tracer in China. The technique is being applied to the research field of cell messenger at the China Institute of Atomic Energy (CLAE). The sample preparation methods and the AMS measurements are discussed and some interesting results are presented.     

任2n个元生成的子代数都是n步次理想的诣零Jordan代数

<正> 众所周知,幂零群的任一子群是n步次正规子群.反之如何呢?这正是[1]中的第22问题.对此,文章[2]进行了讨论.类似地,对于其它代数系统,[3]讨论了结合环,[4]讨论了Lie代数,[5]讨论了交错代数.本文讨论Jordan代数. 以下用J表示域F(特征任意)上的Jordan代数,表示由J的子集H生成的子代数.     

类立克次氏体的鉴定及其在系统感染小麦植株中的胞间转移

本文论述经电子显微镜观察、诊断后证明,小麦黄化卷叶病系类立克次氏体(RLO)侵染所致。病原物的形态结构及其在寄主植株内的分布具有典型的类立克次氏体特征。在寄主维管束的韧皮部、木质部均能见到RLO。导管中RLO颗粒与一些弥漫于导管中的电子致密物质关系密切,经常可见原木质部的管壁,有时是成熟的导管壁受到腐蚀而形成孔道,RLO可经这些孔道进入相邻细胞和细胞间隙。筛管中可见大量RLO,它们可以经过筛孔进入另一筛分子。RLO穿越细胞壁的位置大多在胞间连丝密集区,或纹孔区。这些地方连丝间的次生壁因RLO的侵染而消融形成孔道。少数胞间孔道与胞间连丝或纹孔无关。基于上述观察结果,对该病原物造成寄主系统感染的机制进行了讨论。     

IDENTIFICATION OF A RICKETTSIA-LIKE ORGANISM AND ITS INTERCELLULAR MOVEMENT IN SYSTEMATICALLY INFECTED WHEAT PLANT

According to the electron microscopic observation the wheat yellow curl-leaf disease wascaused by a rickettsia-like organism (RLO). The morphology and structure of the pathogenand its distribution within the host plant were of typical characteristics of the RLO. RLO_Swere seen in the phloem and xylem of the host plant. In xylem elements RLO particleswere closely related to electron-dense materials spreading in them. Some channels wereformed in the cell walls of protoxylem, and sometimes in the cell walls of mature xylem ele-ments which were eroded. RLOs entered adjacent cells and intercellular spaces via thesechannels. A large number of RLOs were seen in sieve elements and they could get intoadjacent sieve elements via sieve pores. The places of intercellular movement of RLOs weremostly in the plasmodesmata-dense areas or pit fields where the primary cell walls amongplasmodesmata were dissolved to form some channels by the invasion of RLOs. And theforming of less intercellular channels did not relate to plasmodesmata and pit fields. Basedon these results the mechanism of systematical infection of host plant caused by the RLO isdiscussed in this paper.     

状态方程靶制备技术研究

随着状态方程物理实验的深入，对靶的制备精度和要求不断提高，采用原有的工艺制备的EOS靶已经不能满足物理实验的要求。考虑现有设备情况，采用轧机轧制法制备金属薄膜，精密切削加工楔形靶，真空扩散连接法制备Al-Cu阻抗匹配靶。     

ACTA PHOTONICA SINICA

本文采用有效折射率方法对Ti扩散Er     

聚氧化烯烃脂肪酸乙醇酰胺磺基琥珀酸单酯二钠的表面活性

聚氧化烯烃脂肪酸乙醇酰胺磺基琥珀酸单酯二钠的表面活性吴金川＊庄燕何志敏屠雨恩（天津大学化学工程研究所天津３０００７２）关键词聚氧化烯烃脂肪酸乙醇酰胺磺基琥珀酸单酯二钠，表面活性，临界胶束浓度，润湿力，起泡力，乳液稳定性１９９７－０２－２８收稿，１９９...