一种用于GR仪器PMT的高压电源设计

GR射线探测是石油开发中对井眼中因放射性元素自然衰变产生的GR射线的强度不同来进行地层识别,岩性分析,深度校准的常用方法.GR信号检测时需要采用高性能的高压电源驱动光电倍增管,对烁晶体探测到地层中的微弱GR射线进行放大实现.研究了一种针对GR仪器内PMT工作的高压电源电路,该电路采用PWM的控制方式,体积狭小,转换效率...     

固体氧化物燃料电池阴极材料的研究进展

简述了固体氧化物燃料电池阴极材料研究近况及重要进展。     

双正交尺度函数的两尺度关系

构造了双正交尺度函数Lk^j（x）与Lk^j^-（x）的两尺度关系。首先给出了双正交尺度函数Lk^j（x）与Lk^j^-（x）的定义以及几个引理,通过这些得到了双正交尺度函数的两尺度关系式。     

混合波动差分进化算法*

针对传统差分进化算法在处理复杂优化问题时存在易陷入局部最优解和求解精度低的缺陷,提出了混合波动差分进化算法。该算法预先设置两组配置参数,并依据混合系数的区分,依次选择每组中的交叉因子和相关参数构成波动算子生成变异率用于新算法中;同时为了加快收敛速度,采用选中随机向量中适应度值最优的向量作为基向量,避免算法寻优的盲目性。对一系列经典Benchmark函数的测试,并将实验结果与其他算法进行比较,证明了本算法的收敛速度与优化质量均显著改善。     

活性炭滤棒成型机的改进

针对活性炭滤棒内活性炭颗粒分布不均匀的现象,提出改进方案并实施,效果良好。     

Photoluminescent properties of tunable green-emitting oxynitride (Ba3-xSrx)Si6O12N2:Eu2+phosphor and its application in white LEDs

Green emitting Eu2+-doped (Ba3?xSrx)Si6O12N2 solid solutions were synthesized through solid state reaction at 1350 oC for 10 h under a N2/H2 atmosphere. The XRD patterns revealed that the solid solutio...     

High temperature stability of Eu2＋-activated nitride red phosphors

The novel nitride-based luminescent materials have received much attention since the end of the last century. In this paper, the commercial Eu2＋-activated nitride red phosphors, Sr1.95Si5N8：Eu0.05, Sr1.85Si5N8：Eu0.15 and Ca0.99AlSiN3：Eu0.01 phosphors were an-nealed at different temperatures （beyond 300 oC） to investigate the dependence of their luminescence performance and structure vari-ability on the temperature. By photoluminescence spectra, X-ray diffraction （XRD） and thermogravimetry-differential scanning calo-rimetry （TG-DSC） analysis, the high temperature stability of the hosts and activator of the three samples were disclosed. With the an-nealing temperature increasing, the activator Eu2＋ions were firstly oxidized and then host in Sr1.95Si5N8：Eu0.05 and Sr1.85Si5N8：Eu0.15, but for Ca0.99AlSiN3：Eu0.01, only the oxidation of the host could be observed, which would lead to the luminescence degradation and even failure of these phosphors. The activator Eu2＋ions were much more stable in CaAlSiN3：Eu than Sr2Si5N8：Eu due to their crystal surroundings, and its concentration also influenced the temperature stability of Sr2Si5N8：Eu.     

白光LED用硅酸盐系列荧光粉的专利分析

白光LED用硅酸盐荧光粉主要应用在对显色指数不高的暖白光照明领域与中低端液晶背光显示领域,其专利申请量表示了荧光粉的技术发展趋势。以含有M、Si、O、Ce/Eu的白光LED用硅酸盐荧光粉为主要研究对象,对专利文献著录项目数据与核心技术内容进行统计分析,讨论了其全球专利的申请趋势、产出国家或地域分布情况、申请目标国家或地域比例情况,全球主要研究单位专利申请情况,以及其专利在华主要申请单位技术分布情况、在华主要申请单位申请量排名情况等,希望对白光LED用荧光粉的企业及行业发展提供参考与借鉴。     

冷却机废气热风烧结

利用环冷机低温段（２００℃左右）废气作为热风风源的热风烧结技术开发成功的，并在鞍钢新烧结１号烧结机生产中取得节能，优质，经济效益好的效果。本文介绍这项技术的特点和经济效益。