Valence-band offsets of strained heterojunction ZnS/ZnSe

采用基于lMTO-ASA的平均结合能计算方法，研究了在znSXSE1-X衬底上沿（001）方向外延生长的应变层异质结znS/znSE的价带带阶值。研究表明，应变的结果使价带带阶随衬底组分（X）的变化呈非线性且单调的关系；与其他理论计算和实验结果比较，本文的计算结果比较理想The valence-band offsets (VBO) of strained heterojunction ZnS/ZnSe as a function of the alloy composition x of ZnS x Se 1- x substrates are studied using the average-bond-energy theory based on LMTO-ASA method.It is shown that the strain leads to the nonlinear and monotonous variation of VBO's with x .The calculation results are more desirable compared with the theoretical and experimental data previously reported.国家和福建省自然科学基

VALENCE BAND ofFSETS of TERNARY ALLOY HETEROJUNCTIONS (AlP) x (Si 2) 1-x /GaP AND (GaP) x (Si 2) 1-x /GaP

采用基于lMTOASA的平均键能计算方法和原子集团展开方法，研究了两组晶格匹配三元合金异质结（AlP）X（SI2）1-X/gAP和（gAP）X（SI2）1-X/gAP的价带带阶ΔEV（X）值。研究表明，两组异质结的ΔEV（X）值随合金组分X的变化都是非线性的，且表现出非单调的关系。The valence band ofFsets Δ E v(x) as a Function of the alloy compositon x of two typical lattice matched ternary alloy heterojunctions (AlP) x (Si 2) 1-x /GaP and (GaP) x (Si 2) 1-x /GaP are studied by using the average bond energy theory in conjunction with the cluster expansion method.It is shown that the variations of Δ E v(x) at (AlP) x (Si 2) 1-x /GaP and (GaP) x (Si 2) 1-x /GaP are nonlinear and non monotonous.The calculated results of Δ E v are in very good agreement with the data previously reported.国家和福建省自然科学基

正态分布近似式的研究

正态分布近似式的研究郑金成蔡淑惠王仁智郑永梅程灿东（厦门大学物理系，361005）正态分布是一种重要的概率分布，在许多情况下，简单的近似解析方程有助于问题的解决。通过将理论计算与数值模拟相结合的方法给出了一个较好的近似式。标准正态分布函数的形式为Φ（..

[[alternative]]Relationship Study Between the Perceptions of Clinical Nursing Teachers' Caring Behaviors and Learning Satisfaction for the Junior College Nursing Students In Taiwan

[[abstract]]本研究目的在探討專科護理學生知覺臨床護理教師關懷行為與學習滿意度之現況，並探究專科護理學生知覺臨床護理教師關懷行為與學習滿意度之關係及內涵。採橫斷式相關性研究，以北部某醫護管理專科學校二專日間部、二專夜間部及進修部、五專部於94學年度下學期至某醫學中心內科病房、外科病房、護理之家、精神科病房實習之護理學生，共296人為研究對象。使用結構式問卷:「知覺關懷行為量表」及「學習滿意度量表」與個別性訪談呈現四個關懷向度內涵，經資料分析所得，研究結果重要發現如下:1.專科護理學生所知覺到臨床護理教師的關懷行為是中等偏高的正面關懷。2.不同學制及不同實習科別的專科護理學生所知覺到臨床護理教師的關懷行為有顯著差異。3.年齡愈大、工作經歷愈資深的專科護理學生所知覺到臨床護理教師的關懷行為呈顯著負相關。4.專科護理學生整體學習滿意度在「非常滿意」至「滿意」之間，屬於中上偏高之滿意程度。對護理工作愈有興趣者學習滿意度愈高。5.專科護理學生學習滿意度與臨床護理教師的關懷行為呈顯著正相關。臨床護理教師在「教學環境營造」及「教學方法」向度的關懷行為對專科護理學生學習滿意度具顯著預測力。6.專科護理學生知覺臨床護理教師關懷行為之內涵主要反應在「滋養」、「互動」、「期待」、「模範」四個向度。最後，根據本研究結果提出對護理臨床教育、護理研究及後續相關研究之建議方向，以供參考。關鍵字:臨床護理教師、知覺關懷行為、學習滿意度[[abstract]]The purpose of this research was to explore the existing situation of clinical nursing teacher’s caring behaviors and learning satisfaction and to investigate the relationship and the connotation meaning between the perception clinical nursing teacher’s caring behaviors and the learning satisfaction by the junior college nursing students. The cross-sectional correlation design was used and taking some 296 nursing students as the participants. These students are studying at day section and night section of 2-year institute as well as after-school study section and 5-year section of the medical nursing management institutes located in northern Taiwan and are assigned to take practicing courses at internal medicine wards, surgery wards, nursing home and psychological medicine wards in a medical center during the second semester of 2005. The Structural Questionnaires were used, focusing on “Perception of Caring Behaviors Scale”, Learning Satisfaction Scale” and individual interview to present the connotation meaning of four kinds of caring aspects. After analyzing the questionnaires, the result indicated as the followings: 1) The caring behaviors of the clinical nursing teachers as being perceived by the junior college nursing students belong to above-the-medium positive caring. 2) Obvious difference exists for the clinical nursing teacher’s caring behaviors as being perceived by the junior college nursing students in aspects of different semester system and different practicing sections. 3) Negative correlation exists for the clinical nursing teacher’s caring behaviors as being perceived by the junior college nursing students in aspects of the seniors, and the students of rich clinical work experienced. 4) The overall learning satisfaction of the junior college nursing students falls between “Very Satisfied” and “Satisfied”, which belongs to above-the-medium satisfaction. The more is interested in nursing, the more is satisfied. 5) Positive correlation exists between the caring behaviors of clinical nursing teachers and the learning satisfaction of nursing students, indicating obvious prediction in aspects of “Creating Teaching Environment” and Teaching-learning Process” for the learning satisfaction of nursing students. 6) The connotation meaning of the junior college nursing students for the perception clinical nursing teacher’s caring behaviors is mainly reflected on “Nurturance”, “Interaction”, “Expectation” and Modeling”. Finally, the suggestions were proposed according to the research result. Keywords: Clinical Nursing Teacher, Perception of Caring Behaviors, Learning Satisfactio

垂向荷载作用下饱和砂土的稳定性分析

用小扰动方法作了饱和砂土在垂向荷载作用下的稳定性分析,结果表明,一般情况下,有两种失稳形式:软化失稳和渗透失稳。饱和砂土的稳定性主要受到孔隙率、骨架模量和孔隙压力梯度的影响。这三个量与颗粒密度可以组成一个无量纲量η,该量的大小决定了饱和砂土是否会失稳

水平动载下饱和砂土地基液化区扩展

　对一侧受沿深度分布的水平振动载荷时,半无限饱和砂土地基液化区域的扩展进行了数值分析。结果表明: 在水平振动载荷作用下,砂土地基液化区域从载荷端由近到远逐渐发展;随载荷强度和频率的增加,以及土体模量的减小,液 化发展逐渐加快。在考虑的频率范围内,随着载荷频率的增加,土体表面的变形和土中的孔隙压力上升速度增加

蔗渣纤维素在离子液体中的均相混合酰化研究

以蔗渣纤维素为原料,在1-烯丙基-3-甲基咪唑氯盐([Amim]Cl)离子液体中,以乙酸酐和丁酸酐为酰化试剂,制备出不同取代度的醋酸丁酸纤维素产品,通过用FT-IR1、H-NMR、TGA等手段对产品进行了结构和性能表征。研究表明,通过对反应条件的控制可得到具有特定酰基含量的CAB,本方法得到了预期结构的CAB产品,制备出的CAB产品乙酰基含量为3.6%~17.4%,丁酰基含量为26.5%~46.0%。热重结果显示,CAB在370℃才达到最快分解温度,表明CAB具有良好的热稳定性

Industrial Edge Computing: Vision and Challenge

随着工业互联网技术的发展,工业设备生成的数据量以指数形式增长,给云计算带来了巨大的数据压力.边缘计算由于低时延、低流量、隐私性等特点在工业领域中有了越来越多的应用研究.本文针对近几年的工业云计算和边缘计算技术进行了综述.首先介绍了工业互联网背景下云计算和边缘计算的发展历史,分析了边缘计算的定义和边缘计算的几种计算典型形式与工业边缘计算的关系.其次分析了工业边缘计算的几种典型应用,针对当前的研究现状,讨论了工业场景中影响边缘计算应用的几种关键技术,并对工业场景下的研究挑战做了总结与展望.</p

Liquefaction and Displacement of Saturated Sand under Water Pressure Oscillation

为考察饱和砂土地基受到水压振荡作用时的动力响应,根据两相连续介质理论,分析了液化发展、液化区厚度、颗粒速度等.研究结果表明,随着土强度和渗透性的降低与载荷强度的增加,液化发展速率加快;随着土强度的降低和渗透性、载荷强度的增加,变形量增加;如果土的初始分布不均匀,则在渗透性小的位置,应变和孔隙水压力将剧烈变化,这可以解释为什么在一定条件下土中会出现断裂和水层