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阳城用户反映在其经常上下班的道路上会出现掉话情况，且比较频繁。经现场测试及后台参数核查最终确定问题原因为附近下挂直放站的基站搜索窗设置过小，导致可以利用的多径或其它的相邻导频不能被正确利用，形成干扰，致使出现不能切换或掉话等网络问题。增大搜索窗设置后，掉话问题得以解决。 相似文献
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利用高温固相法制备Eu3+掺杂的BaAl2Si2O8荧光粉并研究其发光性能,通过X射线衍射分析该发光材料的结构特征.光致发光谱表明:在近紫外光激发下该荧光粉可以发出较好的红光,峰值位于615nm处;Eu3+的最佳掺杂量为0.08mol.分析了BaAl2Si2O8∶0.08Eu3+材料的发射强度随电荷补偿剂Li+,Na+和K+掺杂量的变化规律,结果表明:随着电荷补偿剂含量的增大,BaAl2Si2O8∶0.08Eu3+的发射强度均出现先增大后减小趋势;K+具有更好的补偿效果.色参数测量结果表明,该荧光粉是一种较好的用于白光发光二极管的红色荧光粉.Abstract： Eu3+ doped BaAl2Si2O8 phosphors were synthesized by a high temperature solid state method, and the luminescent properties were also investigated. The structure characteristics of the luminescent materials were determined by X-ray powder diffractometer. Photoluminescence measurements indicate that the phosphors exhibit a bright red emission centered at 615 run excited by near ultraviolet. The optimal concentration of the doping Eu3+ in BaAl2Si2O8:Eu3+ phosphor was 0.08 mole. The influence of concentration of Li+, Na+ and K+ on the emission spectra of BaAl2Si2O8:0.08Eu3+ were analyzed. The results show that the emission intensity of BaAl2Si2O8:0.08Eu3+ firstly increases and then decreases with increasing the concentration of charge compensator, and K+ has better compensation effect The color parameters indicate that this phosphor is a superior red phosphor candidate for white light-emitting diodes. 相似文献
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某编织厂由于业务发展需要,新增多部移动手机用户,但是用户反映在该区域内很多地方信号都比较差。后经现场测试分析,定位为附近窑村基站B/C扇区馈线鸳鸯导致其覆盖区域过小,不能对该地区进行有效覆盖,经优化整改后,弱覆盖问题得到明显改善。 相似文献
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