材料期刊网

Spatial Potential Distribution around Trench Target during Plasma Immersion Ion Implantation

Xiubo Tian , Chunbei Wei , Shiqin Yang , Paul K.Chu , Ricky K.Y.Fu

材料科学技术（英文）

Plasma ion implantation, an alternative to conventional beam-line ion implantation, is a sheath-acceleration ion bombardment technique and the initial sheath is crucial to the process efficacy and surface properties. The initial spatial potential distribution in the plasma sheath around a trench-shaped target is simulated using a two-dimensional model in this work. The results demonstrate that the sheath structure depends very much on the trench width. The potential drop in the trench may be quite small and the sheath expands outward if the width is small. This leads to a smaller incident ion dose into the sidewalls of the trench. In contrast, the initial potential distribution in the central region is quite similar to that without a trench if the trench width is larger than twice the ion-matrix sheath thickness for an infinite plane. Consequently, a higher ion dose into the sidewalls is possible.

关键词: Plasma ion implantation , null , null

Paul阱中射频源倍频作用下囚禁离子运动特性

陈图淼 , 聂宗秀

量子电子学报 doi:10.3969/j.issn.1007-5461.2003.01.010

基于以前的研究结果,采用函数级数展开法,研究了Paul阱中在非理想射频囚禁场作用下、考虑二次谐波φ=U-V1cosΩt-Vscos 2Ωt时囚禁离子运动特性,得到了单个囚禁离子运动Mathieu方程的解析解和z方向离子运动的特征频率(宏运动,微运动)随倍频参数的变化规律.

关键词: 运动特性 , 倍频效应 , Paul阱

Paul阱中共线两离子量子力学问题

邬云文 , 海文华

量子电子学报 doi:10.3969/j.issn.1007-5461.2006.05.011

运用熟知的级数截断方法,设计程序计算了线性Paul阱中两离子量子门系统Schr(o)dinger方程的精确解,分析了质心波函数几个较低能级的态,并作出对应的几率分布图;计算相对距离的方均差△r2＞(h)/2,相对运动的动量方均差△p2＜(h)/2,并满足量子力学的Heisenberg不确定度关系△r.△p＞(h)/2,它满足压缩态的条件,即质心处于基态时,两离子相对位置的量子态是一个压缩态,并得到了两离子纠缠态的表达式.纠缠的存在对量子计算和量子信息有影响,量子测量的不确定度和纠缠是在实验中应加以考虑的问题.

关键词: 量子信息 , Paul阱 , 两离子 , 纠缠 , 量子态

K金首饰走俏市场

黄晓霞

黄金 doi:10.3969/j.issn.1001-1277.2004.11.018

以金合金为基体材料或镶嵌各种人工合成宝石而加工制作的K金首饰在颜色、品种、款式等方面都优于纯金首饰,并随着设计及加工工艺水平的不断提高,K金首饰以其个性化、艺术化的创意在市场的份额越来越大.

关键词: 纯金首饰 , K金首饰 , 款式 , 首饰设计 , 制造工艺

K*(892)电磁质量反常

闫沐霖

原子核物理评论 doi:10.3969/j.issn.1007-4627.2001.04.010

电中性的K(892)电磁质量可以大于带电荷的K(892). 这是异乎寻常的现象, 将被称为K-电磁质量反常. 评述了这个课题, 并指出K的质量劈裂可以在北京谱仪(BES)上作精密测量.

关键词: 电磁质量劈裂 , BES实验 , 介子共振态

激光冷却Paul势阱中两个粒子的暂态行为

沈京玲 , 戴建华 , 张洪钧

量子电子学报 doi:10.3969/j.issn.1007-5461.2000.05.049

关键词:

K-cor夹层结构制备工艺

段沐枫 , 李宁 , 郑莹莹 , 肖军 , 李勇

宇航材料工艺

K-cor是应用Z-pin增强技术的一种新型高性能结构.本文以NHZP-1树脂为基体研究适合K-cor结构的半固化Z-pin拉挤工艺,得到固化度为51.25％的Z-pin为满足制备要求的最佳参数,并制作悬空装置采用两步法进行半固化Z-pin的植入和压弯,探索出压弯和后固化工艺.在此基础上,对试制的K-cor夹层结构进行平拉和剪切试验研究.结果发现,折弯长度是K-cor夹层结构的另一重要参数,较长的折弯长度会增加Z-pin与蒙皮的结合面积从而提高结构的拉伸性能.

关键词: 复合材料 , 半固化Z-pin , K-cor夹层结构 , 制备工艺 , 力学性能

(da)/(dN)与K_1间关系的探讨

陈篪

金属学报

本文证明我们所建议的关系: (da/dN)-C[(△K)~2-K_2~2/K_1~2-(△K)~2]~p能够很好地表达R=(K_(min)/K_(max))=常数时(da/dN)随△K的全部变化,其中P值在1左右,C约在3×10~(-3)—10~(-2)毫米/周之间。

关键词:

Electronic structure and transport properties of K-doped blue bronze Rb0.15K0.15MoO3

Materials Letters

Single crystals of K-doped blue bronze Rb0.15K0.15MoO3 and Rb0.3MoO3 have been investigated by measurements of the X-ray photoemission spectrum (XPS), electrical resistivity and thermoelectric power, respectively. Analysis of the XPS data reveals that two final states representing alternate screening channels coexist in Rb0.15K0.15MoO3. Compared with the pure bronze, the Mo sites of the doped sample contain less 4d electrons which reflected in the movement of Mo3d spectrum. Due to the discrepancy of electronic structure, the K ion doping results in the notable increase of the single particle activation energy and decrease of the thermoelectric power in the charge density wave state. (C) 2007 Elsevier B.V. All rights reserved.

关键词: blue bronze;charge-density-wave;electronic structure;nonlinear transport;k0.30moo3;tl0.3moo3;k0.3moo3;moo3

The effect of yttrium addition on the isothermal oxidation behavior of sputtered K38 nanocrystalline coating at 1273 K in air

Surface & Coatings Technology

The influence of various amounts of Y addition on the isothermal oxidation behavior of sputtered Ni-based superalloy K38 nanocrystalline coating at 1273 K was investigated. The result indicated that the addition of 0.05 and 0.1 wt.% Y in nanocrystalline coating enhanced the selective oxidation of Al, reduced scale growth rate and retarded the phase transformation from metastable to stable alumina. In contrast, 0.5 wt.% Y addition significantly increased the oxidation rate of the coating, the incorporation of Ti in the external alumina scale accelerated the phase transformation to stable alumina. (C) 2007 Elsevier B.V. All rights reserved.

关键词: high temperature oxidation;nanocrystalline coating;reactive-element;superalloy;high-temperature oxidation;oxide scales;percent y2o3;alloys;k38g;superalloy;resistance;diffusion;corrosion;growth