高压热处理对氧沉淀低温形核的影响

研究了外加高压(1GPa)下对450℃热处理硅片中氧沉淀行为的影响.透射电镜观察表明相对于大气压下热处理的样品,高压处理的样品会产生密度更高、尺寸更小的氧沉淀,表明高压有利于小直径氧沉淀的生成.电学性能测试表明,高压下处理的样品其热施主生成浓度和生成速率远远高于常压下处理的样品,这表明热施主与低温热处理过程中生成的高浓度氧沉淀核心有密切的关系.     

CCD高速信号采集和处理系统

介绍了一种用于线阵ＣＣＤ高速数据采集的方法和系统，用双ＣＣＤ图象存储体逐场存储ＣＣＤ信号，ＣＰＵ直接对存储体进行寻址运算的原理，并用８０９７单片机构成的１６位数据总线ＣＰＵ单元，实现了ＣＣＤ信号的高速采集及处理。     

中国台湾电信市场现状

台湾电信市场的开放大致分四个阶段,从1995年起,陆续开放了移动通信、卫星通信及固定通信等多种业务。固网市场,2001年新世纪资通、台湾固网和力霸宽频电信的加入打破了中华电信的独家垄断,开始形成四强竞争的新局面。移动领域,1997年底6家运营商8张民营执照的发放开始了该领域史无前例的竞争。在2001年1月,台湾大哥大、远致电信、亚太行动宽频、联邦电信和中华电信获得了3G执照,累计竞标金额达488.99亿元(新台币)。     

工艺条件对薄片陶瓷材料凝胶流延成型的影响

利用有机单体的聚合原理，成功进行了陶瓷薄片材料的凝胶流延成型。讨论了工艺条件对成型的影响。使用惰性气氛保护克服了单体聚合反应中的氧气阻聚问题，浆料在一定温度和气氛条件下能够顺利完成聚合反应。所成型的坯体具有良好的强度和柔韧性，在1550℃经2h烧结，烧结样品显微结构均匀，没有发现晶粒异常长大现象，烧结体致密度达到97．7％。     

99Tcm-MDP scintigraphy in high-voltage electrical burn patients

In high-voltage electrical burn injuries (> 1000 V), it is difficult to identify the site and extent of non-viable deep tissue damage for debridement to avoid further tissue injury from wound infection and the risk of sepsis. This prospective study was designed to evaluate the usefulness of 99Tcm-methylene di-phosphonate (99Tcm-MDP) scintigraphy in detecting the extent of tissue injury and determining the level of amputation required for electrical burn patients. Over a 5 year period, 33 high-voltage electrical burn patients were studied. Blood flow and blood pool studies revealed absent perfusion in 37 limbs, all of which eventually were amputated. In addition to a routine three-phase bone scan, images were obtained at 30-60 min (early images) to evaluate whether soft tissue injury could be detected better at that time. For comparison of the detection rate from the early images and bone (delayed) images, 164 corresponding spot views of both images were reviewed. Eighty-three and 125 tissue necrotic lesions were demonstrated by the early images and bone images respectively. All of the 83 lesions found by the early images were more clearly identified by the bone images. All but one of the 125 lesions underwent surgical debridement or amputation. We concluded that the blood flow and blood pool images correlated well with the level of amputation required. The site and extent of tissue necrotic lesions can be clearly identified on 99Tcm-MDP bone scans. Because the early images were less sensitive in detecting tissue necrosis, we suggest that early imaging is not necessary.     

带有集中质量的分布质量弹性转动横振精确解

求得了带有集中质量的分布质量弹性转轴系统横向自由振动的频率方程和振型函数的精确解析表达式，及其与不转动轴系统自由振动的频率方程和振型函数及转动角速度之间的精确解析关系     

Structured document storage and refined declarative and navigational access mechanisms in HyperStorM

The combination of SGML and database technology allows to refine both declarative and navigational access mechanisms for structured document collection: with regard to declarative access, the user can formulate complex information needs without knowing a query language, the respective document type definition (DTD) or the underlying modelling. Navigational access is eased by hyperlink-rendition mechanisms going beyond plain link-integrity checking. With our approach, the database-internal representation of documents is configurable. It allows for an efficient implementation of operations, because DTD knowledge is not needed for document structure recognition. We show how the number of method invocations and the cost of parsing can be significantly reduced. Edited by Y.C. Tay. Received April 22, 1996 / Accepted March 16, 1997     

密码子优化的牛精蛋白基因在大肠杆菌中的表达

以PCR的方法得到牛精蛋白基因的基因，去其内含子，得到牛精蛋白cDNA，克隆入原核表达载体pGEX-2T中，组装成表达载体pGEX-2T-PE，利用大肠杆菌偏好的编码精氨酸的密码子CGT将野生型牛精蛋白基因中编码精氨酸的稀有密码子（AGA或AGG）替换掉，通过基因合成得到密码子优化的牛精蛋白的基因，将其克隆入原核表达载体pGEX-2T中，组装成表达载体pGEX-2T-PS。将这两个表达载体分别转化入大肠杆菌表达菌株BL21中，经IPTG诱导，同样条件下，野生型牛精蛋白基因无法得到表达，密码子优化的牛精蛋白基因能够得到良好的表达，表达产物约占细菌总蛋白的18％，将表达蛋白纯化，进行DNA－蛋白结合实验，发现其能与DNA发生非特异性的结合。     

非掺杂InP的低温光致发光研究

研究了2K低温下非有意掺杂InP单晶的光致发光谱,对近带边的辐射跃迁进行了仔细分析,报道了InP单晶在大功率光激发时束缚于中性施主的激子跃迁发光相对减弱、而束缚于中性受主的激子跃迁发光相对增强的现象,并探讨了其机制,确认了材料中存在Mg、Zn等残余受主杂质,并计算得到Mg受主的离化能为41.5meV.