Temperature Distribution Analytical Calculation for the Laser Lift-off of GaN/Al_2O_3 Material

【中文文摘】分析了脉冲激光作用下GaN的衬底剥离过程。利用简化的一维模型,给出一种比较直观的脉冲激光辐照下GaN/Al2O3材料温度分布的解析形式,得到了分界面温度和脉冲宽度的关系。表明,单脉冲作用下分界面的温度与加热时间的平方根成正比,并得出脉冲过后随着深度变化温度梯度的分布。在连续脉冲作用时,分界面的温度呈锯齿状不断升高。 【英文文摘】The process of laser lift-off of GaN thin films from substrates was analysed.A temperature distribution analytical calculation form of the GaN/Al_2O_3 material irradiated by pulsed laser was presented under one dimension,and the temperature calculation form of different interface was obtained.The results show that the temperature of interface is in proportion to the square root of time when the material is irradiated by single pulse laser,however,it increases saw-like when the material is irradiated by continuous pulse laser.国家自然科学基金资助项目(60276029); 福建省自然科学基金资助项目(A0210006)资助项

Developing Flow Battery for Large Scale Energy Storage

介绍一种新近发展迅速的大规模蓄电技术——液流蓄电池。叙述了其原理和优势、国内外发展现况和关键技术;分析了其作为风能与太阳能发电的蓄能、电网调峰、用电大户自备电源的应用前景;提出了发展我国液流电池的意见、建议。This article introduces a fast-developing large scale energy storage technology-flow battery, narrates its principles, advantages, development status and key technologies of both domestic and abroad. This article also analyzes the application prospects of the flow battery when it is used as the energy storage device for wind and solar power plant, in power management, and as the standby power source of the big electricity-consumer. The proposals of developing flow battery are also presented

基于DEA模型分析我国公立医院运行效率

目的运用数据包络分析方法评价我国公立医院运行效率及变化,为公立医院提高运行效率、进一步完善和优化卫生资源配置提供决策依据。方法选取2011-2015年《中国卫生统计年鉴》等统计资料中的数据,采用数据包络分析法的CCR模型在规模报酬不变情况下计算综合效率值、BCC模型在规模报酬可变情况下计算纯技术效率值和规模效率值,对全国公立医院的运行效率进行分析,并通过Malmquist模型对生产效率变化趋势进行分析。结果 2014年全国31个省市公立医院平均综合效率值为0.887,综合效率值为1即DEA有效的省市10个,处于规模效率不变状态,其他省市是DEA非有效且处于规模效率递减状态;DEA有效省市主要集中在东部和西部;26个(83.88%)省市公立医院全要素生产率提高;非DEA有效省市若达到DEA有效可节省大量卫生资源投入、获得更多医院产出。结论近五年我国公立医院管理和技术方面效率有很大提高,但由于医院规模扩张过快反而降低了医院运行效率。适度的规模更有利于公立医院效率的提高,应该控制大型公立医院的发展规模,引导医院提高医疗技术和管理水平,促进内涵式发展,改善服务、改进管理,从而提高效率。国家自然科学基金项目(71403229

Discussion of screening strategy of retinopathy of prematurity

目的:根据早产儿出生体重和出生胎龄为指标,探讨早产儿视网膜病变的临床筛查标准和初次筛查时间。方法:收集2008年2月~2011年2月厦门市妇幼保健院nICu病区1 148例早产儿,使用双目间接眼底镜进行眼底检查,收集相关临床资料进行统计分析。结果:出生体重≤1 000 g、1 001~1 250 g、1 251~1 500 g、1 501~1 750 g、1 751~2 000 g、>2 000 g各组间阈值rOP发生率比较有统计学差异(χ2=201.54,P32周时阈值rOP发病率明显降低;rOC曲线显示在出生胎龄32.07周面积最大;出现阈值rOP时的矫正胎龄﹤35周的8例早产儿,出生后周龄均在4~6周。结论:出生体重≤1 500 g和出生胎龄≤32周是rOP筛查指标;初次筛查时间在矫正胎龄≥35W或出生后4~6周。Objective:To explore the clinical screening criteria and screening time for the first time according to birth weight and birth gestational age of premature infants.Methods:A total of 1 148 premature infants from NICU of the hospital from February 2008 to February 2011 were collected,bilateral indirect ophthalmoscope was used for fundus examination,related clinical data were collected for statistical analysis.Results:There was statistically significant difference in the incidence of threshold retinopathy of prematurity(ROP) among the infants with birth weight ≤1 000 g,1 001-1 250 g,1 251-1 500 g,1 501-1 750 g,1 751-2 000 g,and >2 000 g(χ2=201.54,P1 500 g decreased significantly.The area under ROC curve was the largest in the infants with birth weight=1 532.5 g;there was statistically significant difference in the incidence of threshold ROP among the infants with birth gestational age32 weeks decreased significantly ROC curve showed that the area was the largest in the infants with birth gestational age=32.07 weeks;the gestational weeks of 8 premature infants with threshold ROP whose correct gestational weeks was less than 35 weeks were 4-6 weeks.Conclusion:Birth weight≤1 500 g and birth gestational weeks≤32 weeks are screening indexes of ROP;the screening time for the first time was correct gestational weeks≥35 weeks or at 4-6 weeks after birth.厦门市科技计划项目〔350Z20114027

Leray Formulas with finite Discrete Kernels on Circular Building Domains

在Cn空间中由n个圆型域构成的堆垒域d上，建立了有限离散局部全纯核的lErAy积分公式.For the building domain D consisting of the union of any N circular domains in Cspace, the Leray formulas with finite discrete local holomorphic kernels have been obtained

Experimental study for cement sample inner damage by exploding wave

通过优化试验方案，实现了爆炸激波对水泥试样内部的损伤破坏试验，观察到激波对试样的损伤破坏现象。根据试验需求，设计、制作和标定了可用于测量水泥试样内部激波压力（或速度）的传感器，并在水中与商业传感器一起进行了测试，发现两种传感器获得的波形一致，并且该传感器的尺度可以满足试验的需要。利用量纲分析的方法，得到了激波在水泥试样中的衰减规律模型，通过比较相同条件下实测压力与模型计算的压力，发现计算压力要比实测压力高5％～15％

利用爆炸技术改善低渗透储层的实验研究

为了更好地开发低渗透油气藏,首先介绍"层内爆炸"增产技术的基本思路,然后用水中炸药界面爆炸对水泥试样损伤破坏的实验来模拟水力裂缝"层内爆炸"增产中激波使岩石损伤开裂的现象。通过实验观察到3个损伤区域:压剪损伤区,拉伸损伤区和边界损伤区,并且微裂纹的启裂扩展与水泥试样的初始损伤有关。分析发现:压剪损伤区和拉伸损伤区内裂纹的密度与装药量相关;压剪损伤区和拉伸损伤区半径分别为装药当量半径的2 5和20 30倍;量纲分析表明,损伤区半径与装药当量半径成线性关系。通过简易渗透率实验,发现压实区有一定的渗透率,这对"层内爆炸"采油技术的研究具有重要意义。最后,定性分析激波在试样中的传播过程以及试样微裂纹的启裂扩展机制

激波作用下水泥试样内部损伤试验方法研究

通过优化试验方案，实现了爆炸激波对水泥试样内部的损伤破坏试验，观察到激波对试样的损伤破坏现象。根据试验需求，设计、制作和标定了可用于测量水泥试样内部激波压力（或速度）的传感器，并在水中与商业传感器一起进行了测试，发现两种传感器获得的波形一致，并且该传感器的尺度可以满足试验的需要。利用量纲分析的方法，得到了激波在水泥试样中的衰减规律模型，通过比较相同条件下实测压力与模型计算的压力，发现计算压力要比实测压力高5％～15％

Rock damage experiment and evaluation method by exploding wave

通过水中爆炸激波对试样的损伤试验来模拟激波对地层岩石的破坏作用。试验中观测了爆炸后试样内部裂纹形貌的分布，利用自制传感器测到了试样内部的激波压力，优化筛选出了损伤度模型。通过对试样弹性波速进行处理和分析，给出了试样的动态损伤阈值求解方法。结果表明，激波在试样中的传播符合指数衰减规律，相对损伤度、无量纲波速的平方、无量纲拉应力它们两两之间呈线性关系