Structural Analysis of ZnS Thin Film Prepared by Thermal Evaporation

用双舟热蒸发制备了掺稀土硫化锌薄膜，用X射线衍射技术对硫化锌粉末和所制薄膜的晶体相结构进行研究，发现硫化锌薄膜的晶体结构与硫化锌粉末的晶体结构不同。薄膜晶体的生长受诸多因素影响，有择优取向生长趋势，是二维层状结构沿C轴方向的密堆积。这些研究为高新材料的研制提供了参考。ZnS thin films doped with erbium are prepared by thermal evaporation with two boats , and the crystalline phase structures of ZnS powder and the prepared films are studied using x-ray diffraction technique.lt is found that the structure of ZnS film is dif- ferent from that of ZnS powder.The growth of film crystal is affected by numbers of factors and tends to a preferential orientation.The film is two-dimensional layer struc- ture packing along c axis.lt provides basis for research on new luminescence material with high efficiency.福建省自然科学基

Clinical and pathophysiological studies on duodenal ulcers: evidence for the existence of twopopulations.

published_or_final_versionMedicineMasterDoctor of Medicin

基于量子级联激光器的ADN 基发动机燃烧室内CO 浓度和温度测量系统的设计

ADN（二硝酰胺铵）作为一种绿色推进剂已在固体推进剂以及液体推进剂领域得到一定程度的应用，是未来化学推进技术的一个新方向。目前我国正处于ADN 推进剂研究的起始阶段，燃烧过程的研究是当前研究的一个重要问题。由于ADN 基推进剂催化分解及燃烧反应过程复杂，相关的实验数据无法从国外公开文献获得，因此有必要开展ADN 发动机催化分解及燃烧反应的实验研究。本实验采用基于量子级联激光器吸收光谱诊断技术对ADN 基发动机燃烧室内燃烧过程进行探究。CO 是ADN基燃烧反应特征产物之一，通过测量ADN 基发动机不同工况下CO 的浓度和燃烧室内温度，可以获得ADN 基的催化效率及燃烧反应进行的程度

JUNO Sensitivity on Proton Decay p→νˉK+p\to \bar\nu K^+ Searches

The Jiangmen Underground Neutrino Observatory (JUNO) is a large liquid scintillator detector designed to explore many topics in fundamental physics. In this paper, the potential on searching for proton decay in $p\to \bar\nu K^+$ mode with JUNO is investigated.The kaon and its decay particles feature a clear three-fold coincidence signature that results in a high efficiency for identification. Moreover, the excellent energy resolution of JUNO permits to suppress the sizable background caused by other delayed signals. Based on these advantages, the detection efficiency for the proton decay via $p\to \bar\nu K^+$ is 36.9% with a background level of 0.2 events after 10 years of data taking. The estimated sensitivity based on 200 kton-years exposure is $9.6 \times 10^{33}$ years, competitive with the current best limits on the proton lifetime in this channel

JUNO sensitivity on proton decay p → ν K + searches*

The Jiangmen Underground Neutrino Observatory (JUNO) is a large liquid scintillator detector designed to explore many topics in fundamental physics. In this study, the potential of searching for proton decay in the $p\to \bar{\nu} K^+$ mode with JUNO is investigated. The kaon and its decay particles feature a clear three-fold coincidence signature that results in a high efficiency for identification. Moreover, the excellent energy resolution of JUNO permits suppression of the sizable background caused by other delayed signals. Based on these advantages, the detection efficiency for the proton decay via $p\to \bar{\nu} K^+$ is 36.9% ± 4.9% with a background level of $0.2\pm 0.05({\rm syst})\pm$$0.2({\rm stat})$ events after 10 years of data collection. The estimated sensitivity based on 200 kton-years of exposure is $9.6 \times 10^{33}$ years, which is competitive with the current best limits on the proton lifetime in this channel and complements the use of different detection technologies