Preparation of YAG: Ce and YAG: Eu phosphors by oxalic acid precipitation and their properties

白光LED技术对于合理利用能源和绿色照明具有重要意义。它拥有广阔的应用前景，将成为替代白炽灯、荧光灯的新一代新型光源。蓝光LED与YAG:Ce荧光粉配合制备白光LED，是当前白光LED的发展主流。使用性能优异的荧光材料可以有效提高白光LED发光效率。目前，制备YAG:Ce荧光粉公认最有效的方法是固相法；但该方法很难获得球形、无团聚的荧光粉，难以满足高效率白光LED对YAG:Ce荧光粉的要求。YAG:Eu作为一种用于彩色投影电视及紧凑型荧光灯等领域中的高效红色荧光粉，已引起了人们越来越多的兴趣。 本研究用草酸沉淀法制备Ce3+掺杂的YAG:Ce荧光粉和Eu3+掺杂的YAG:Eu荧光粉；通过TG...White LED (W-LED) technology is significant for appropriate utilization of energy and green lighting. It has a wide application prospect and consequently will become the new generation of illuminant as the substitute for the incandescent lamp and the fluorescent lamp. Nowadays it is the mainstream development trend that the W-LED consist of blue light GaN and yellow light YAG: Ce phosphor. Phospho...学位：理学硕士院系专业：化学化工学院化学系_物理化学(含化学物理)学号：20042509

当科で経験した後天性免疫不全症候群（AIDS） ９例の臨床的検討

We encountered nine patients with acquired immunodeficiency syndrome (AIDS). All were men, and ranged in age from 25 to 63 (mean,43.1±13.5years).One patient was a Thailander,one was a Brazilian and the others were Japanese. All patients presented CD4＋T-lymphocyte counts under 100/μl. Eight patients were admitted to our hopital because of pneumocystis carinii pneumonia (PCP), and the other was admitted with toxoplasmosis.Chest X ray films and chest computed tomography(CT)scans of the patients with PCP revealed distinct radiographic findings. We must be aware of the possibility of PCP and human immunodeficiency virus (HIV) infection when we encounter patients with atypical radiographic findings of interstitial pneumonitis.Article信州医学雑誌 48(2): 97-103(2000)journal articl

铈激活的钇铝石榴石荧光粉的制备方法

申请号： 200710009463.4 申请日： 2007.08.28 名称： 铈激活的钇铝石榴石荧光粉的制备方法 公开(公告) 号：CN101113333 公开(公告)日： 2008.01.30 主分类号： C09K11/80(2006.01)I 分类号：C09K11/80(2006.01)I 申请(专利权)人：厦门大学 地址：361005福建省厦门市思明南路422号 发 明 (设计)人：曾人杰;林成通;苏勉曾;郭 瑞 专利代理 机构：厦门南强之路专利事务所 代理人：马应森铈激活的钇铝石榴石荧光粉的制备方法，涉及一种荧光粉。提供一种广义的铈激活的钇铝石榴石荧光粉的制备方法。分子式为Y3-x-y-zRyAl5-mGamO12∶Cex，R′z，步骤：金属离子溶液的配制；沉淀剂溶液的配制；金属离子沉淀物的制备；助熔剂添加和固相反应；烧结；将经高温烧结的粉末，研磨后，依次酸洗，碱洗，水洗，烘干，即可得发光强度高、不经球磨就团聚程度低、粉末粒径适合、粒度分布窄的目标产物YAG:Ce荧光粉，经高温热处理后团聚程度低，不经球磨便可用于封装，可最大限度地发挥其优异的光学性能

EFFECT OF TURBULENCE ON AERODYNAMIC PROPERTY OF BLUFF BODY

This study is concerned with the effects of turbulence on aerodynamic properties subjectto vortex-induced oscillation.The mechanism of vortex-induced oscillation is closely related with the instability ofshear layer which separates from the leading edge of bluff body. Recent investigations havepointed out that the shear layer tends to be easily stimulated in a certain frequency domainby various flow conditions, such as flow pulsation, applied sound, body movement, flowimpingement on the cavity corner and so on.In this study, flow turbulence is considered as one of the external stimulation to shearlayer instability. Furthermore in order to clarify the effects of turbulence on aerodynamicproperties of vortex-induce oscilation, a series of wind tunnel tests, such as measurementsof body surface pressure and vibration amplitude, as well as flow visualization were carriedout for 2-D rectangular and hexagonal cross sections.This study is concerned with the effects of turbulence on aerodynamic properties subjectto vortex-induced oscillation.The mechanism of vortex-induced oscillation is closely related with the instability ofshear layer which separates from the leading edge of bluff body. Recent investigations havepointed out that the shear layer tends to be easily stimulated in a certain frequency domainby various flow conditions, such as flow pulsation, applied sound, body movement, flowimpingement on the cavity corner and so on.In this study, flow turbulence is considered as one of the external stimulation to shearlayer instability. Furthermore in order to clarify the effects of turbulence on aerodynamicproperties of vortex-induce oscilation, a series of wind tunnel tests, such as measurementsof body surface pressure and vibration amplitude, as well as flow visualization were carriedout for 2-D rectangular and hexagonal cross sections