黄河断流的不良影响及水资源利用对策

七十年代以来黄河流域频繁发生的断流现象，加剧了黄河水资源利用的供需矛盾。本文对黄河断流的现状、成因及其影响进行了全面分析，并系统地阐述了黄河流域水资源利用现状及其存在的问题。在此基础上，提出了解决当前水资源供需矛盾的合理途径及建议     

Mo^6＋，Gd^3＋，PbF2组合掺杂对钨酸铅发光的改善和光谱分析

坩埚下降法生长了（Mo^6＋、PbF2），（Mo^6＋、Gd^3＋），（PbF2，Gd^3＋）组合掺杂，及PbF2单掺杂钨酸铅晶体，对样品进行了吸收光谱、光产额、x射线和紫外激发发光光谱等测试和表征，讨论了掺杂对钨酸铅发光的增强效果。掺杂钨酸铅总发光额都得到了增强；在门宽100ns内晶体的光产额都有提高，但在测试门宽在200ns内，（Gd^3＋、PbF2）掺杂样品光产额有所下降。x射线激发发光显示，PbWO4：（Mo^6＋、Gd^3＋）的蓝发光和绿发光分量都有提高；PbWO4：（Mo^6＋、PbF2）蓝发光受到拟制，提高了绿发光成分，晶体光学吸收边明显红移。PbWO4：（Gd^3＋、PbF2）蓝发光得到增强，绿发光得到一定的拟制。光致发光光谱分析表明，Gd^3＋掺杂对PbWO4基质发光有敏化作用。实验证实，F在PbWO4生长中非常不稳定，显示很差的掺杂均匀性。     

Optical properties of Eu^2＋-doped strontium borate glasses containing F-and Li^＋ ions

In this experiment, strontium borate glasses were prepared using the conventional quenching method in air atmosphere. Optical absorption, photoluminescence excitation and emission spectra, X-ray excited luminescence （XEL）, and luminescence decay curve of the as-prepared glasses were investigated at room temperature. The as-prepared glasses had two kinds of Eu ions, i.e., Eu^2＋ and Eu^2＋. Compared with the reported results of strontium borate glasses, Eu^2＋ luminescence was enhanced in the studied strontium borate glasses coprepared with F^- and Li^＋ ions. The coexisting of Li^＋ or F^- in the borate glasses could create more negative defect Vsr″ and stabilize Eu^2＋ ions, which might act as donor of electrons; For the F^- doping, the new center of B（O, F）4 （or BO3F） and BO2F2 units could be considered to be the distorted （BO4）, which were needed as a rigid framework to stabilize the divalent rare earth ions.     

Photoluminescence properties of a blue-emitting phosphor Eu2+-activated Ca3ZnAl4O10

A new aluminate host material Ca3ZnAl4O10 doped with Eu2+ was prepared by a high-temperature solid-state reaction method, and a pure crystalline phase of Ca3ZnAl4O10 was confirmed with X-ray powder diffraction (XRD) measurement. The luminescent property was investigated with excitation and emission spectra. The phosphor could be excited by UV light from 220 nm to 400 nm and emitted a blue luminescence peaked at 450 nm, which corresponded to the 4f65d1→4f7 transition of Eu2+ ions. The dependence of luminesce...     

哈尔滨市无管处确保森林防火通信频率安全

3月31日下午4时,黑龙江省哈尔滨市无线电管理处收到松花江林管局防火指挥部的干扰申诉,称其所属亚布力林业局庆阳林场地区森防通信频率受到不明信号干扰。     

我国三水铝土矿资源的综合利用研究

我国南方的三水铝土矿资源一直没有得到开发利用，属于呆滞的矿产，本文提出采用新的开发技术路线，对三水铝土矿进行溶出处理，得到的滤液用于合成不同类型的沸石，如4A沸石等，溶潭可以采取适宜的处理，综合利用三水铝土矿中的铁，解决环保问题，提高综合开发的效率。