Efficient Measurement of Thermal Coupling Effects for Multi-chip Light-emitting Diodes

随着高亮度的白光LED在室内和室外领域的广泛应用，对大功率LED的要求越来越高，由此多芯片LED应运而生，同时多芯片LED也是大功率LED芯片的发展趋势之一。对于多芯片LED来讲，芯片之间的热耦合是一个重要的问题，因为芯片的温升不仅只是自身产生的热量引起的，还有一部分是由于其他芯片对其的热耦合产生的。本文主要研究的是多芯片LEDLED模块的热耦合问题，主要从理论上推导了多芯片LED模块的热耦合矩阵，并通过热仿真和实验对多芯片LED模块的热耦合矩阵的合理性进行了验证。具体做了以下几个方面的工作： 1.多芯片LED的热耦合模型及其简化。对于单芯片LED来说，其温升主要是由自己产生的热量引起的，传...There are more and more requirements for high power devices in terms of wide applications of high-brightness white light-emitting diodes (LEDs), and therefore, the multi-chip LED emerges. For multi-chip LEDs, thermal coupling phenomena between chips is an important issue. Because the temperature rise of the chip is not only due to the heat generated by itself, but also due to the heat brought by t...学位：工学硕士院系专业：物理科学与技术学院_工程硕士(电子与通信工程)学号：3312013115285

Research on High S/P of Phosphor-type White LED with High Color Temperature

对于白光照明而言,显色指数(CRI)和暗视觉下光通量与明视觉下光通量的比值(S/P)是衡量白光光源质量的两个重要参数。CRI反映的是待测光源下物体色彩还原能力;而S/P值越高的光源下人眼视物越清晰,对节能也具有一定作用。一般而言,这两个参数越高越好;然而在实际中,两者是一对矛盾体。当前的大部分白光光源的S/P值普遍低于2.5。白光发光二极管(LED)具有光谱可调特性,因此可以通过优化光谱,在满足一定的CRI下获得更高的S/P值。首先模拟光谱,然后通过计算机编程调节光谱峰值波长、相对光强度等光谱参数,最终获得高色温(6 500 K)下高S/P值光谱,对于节能照明光源设计具有重要参考价值。For white light illumination, color rendering index(CRI) and scotopic/photopic(S/P) ratio are twocritical parameters to evaluate the quality of white light source. The CRI is introduced to describe the color fidelityof objects under tested light sources. Under light sources with higher S/P values, human eyes can see more clearly,and it also has a certain effect on energy saving. In general, the higher is the values of the two parameters, the quali-ty of the illumination effect is better. However, there is a trade-off between them. The S/P value of most of the cur-rent white light sources is generally less than 2.5. White light emitting diode(LED) has spectrum adjustment charac-teristic, so higher S/P value is obtained under the condition of meeting the certain CRI through optimizing spectrum.Firstly, LED spectrum is simulated, and then spectrum parameters such as spectrum peak wavelength and relativelight intensity are adjusted through computer programming. Finally, high S/P value spectrum under the high colortemperature of 6 500 K is obtained, which has an important reference value for energy-saving illumination lightingsource design.中德国际科技合作项目(2015DFG62190

男护士职业发展规划与管理新进展

随着现代医学技术的高速发展，单一性别的女性护理队伍格局也随之改变，男护士逐渐登上了护理岗位的舞台。男护士面临着很多障碍，因为对中国的人民群众来说，“男护士”还是一个崭新的词汇，因为传统观念的影响、社会舆论的压力以及家庭因素，导致男护士很难长期从事护理岗位，更不会把护理职业作为人生的职业规划目标。如果医院缺乏对男护士的长期培养以及优化晋升机制，护理管理者的管理能力低下，男护士的职业发展得不到支持，会导致其对职业的怠慢，也会导致严重的离职倾向。因此，如何更好地发挥男护士的力量，是对临床护理管理者提出的新的挑战。论文论述了男护士职业发展方向及规划，对男护士的管理进行了探讨，以期为推动男护士的发展提供依据。</jats:p

CBL联合TBL教学模式在儿科临床实习教学中的应用探讨

目的为帮助学生掌握儿科实习的理论知识和临床实践有机结合,并评价此项教学方法的效果。方法2018年6月-2018年12月的临床医学专业儿科实习的学生80名作为研究对象,组建团队为基础的教学模式(TBL)结合以病例为基础的教学模式(CBL)的教学方法,并对教学效果进行问卷调查,了解学生的反馈意见,通过统计学方法分析教学前后各项评分结果的差异性和效果。结果调查问卷结果显示大部分学生认为通过组建团队以及临床病例讨论与回顾的形式,提高了学习效率和综合素质。前后对比的调查表的4项指标(提高理论知识的理解、提高临床实践能力、提高临床思维能力、培养团队协作精神)差异具有统计学差异(P</jats:p

The Studies on Nanosized Materials for Lithium Ion Batteries

报道了作者最近在锂离子电池纳米材料方面的研究工作 .包括纳米负极材料 (如Sb ,SnSb ,CuSn及Si) ,纳米正极材料 (如CuS)合成 ,电化学性质 ,以及纳米材料的晶体结构与形貌在充放电过程中的变化等研究 .此外还报道了具有纳米尺度阴离子的锂盐在聚合物电解质中的增塑作用以及纳米硅Raman光谱和光致发光谱受电化学锂掺杂的影响 .最后对纳米材料的本征性质与其电化学性质的关系进行了讨论 ,并对其在锂离子电池中的应用及在基础研究方面的意义给予了评述 .Our recent works about nanosized materials for lithium ion batteries are reported, including the synthesis of nanosized Sb, SnSb, CuSn x, Si and CuS, their electrochemical performance as anode or cathode active materials,the variation of crystal structure and morphology during discharge and charge cycling. In addition,the self_plasticization of lithium salt with nanosized anion ion in polymer electrolyte,the influence of the electrochemical Li_doping on the Raman spectra and photoluminescence of nano_Si are also introduced. Furthermore,the relationship between intrinsic properties of nanosized materials and their electrochemical behaviors are discussed. The prospect of nanosized materials for lithium ion batteries is drawn.作者联系地址：中国科学院物理所固体离子学实验室!北京100080,中国科学院物理所固体离子学实验室!北京100080,中国科学院物理所固体离子学实验室!北京100080,中国科学院物理所固体离子学实验室!北京100080,中国科学院物理所固体离子学实验室!北京100080,中国科学院物理所固体离子学实验室!北Author's Address: Lab. for Solid State Ionics, Institute of Physics, Chinese Academy of Sciences, Beijing 100080, China$$