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全球卫星定位系统因其高精度、全天候等优点而被广泛应用,但是单一导航系统容易受环境及人为干扰,导致在区域精度和连续性上有较大问题。本文对组合导航系统进行仿真,组合中国BDS、美国GPS、俄罗斯GLONASS和欧盟的GALILEO四个全球卫星导航系统,利用仿真数据对目前GPS单一系统、当前不完整组合系统、未来完整组合系统在赣州地区的几何精度衰减因子(GDOP)值、可见卫星数及导航精度进行对比分析。通过仿真结果可以发现,与单一的GPS系统相比,组合系统在可见卫星数、GDOP和导航精度上都有非常大的优势。 相似文献
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预处理-厌氧-好氧-气浮过滤处理制药废水 总被引:2,自引:0,他引:2
采用预处理-厌氧-好氧-气浮过滤工艺处理马杜霉素铵废水。通过加强对废水的预处理及生物菌的培养,有效地提高了废水的可生化性,保证了处理设施的稳定运行。出水达到了GB8978-1996的二级排放要求。 相似文献
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秦皇岛张桥庄生活垃圾填埋场渗滤液处理站采用物化/三级生化/物化/超滤纳滤工艺处理垃圾渗滤液。设计处理水量为150m3/d,原水COD约为20000mg/L,BOD5约为2500mg/L,NH3-N1000mg/L。运行结果表明,系统对COD的去除率可达95%,出水COD100mg/L,符合《污水综合排放标准》(GB8978—1996)的一级标准。在该工艺的运行中,生物膜的培养和驯化是关键。 相似文献
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采用厌氧/缺氧/好氧/混凝沉淀工艺处理合成革废水,运行结果表明,该工艺处理效果稳定可靠,运行费用低,出水水质达到<污水综合排放标准>(GB 8978-1996)的一级标准. 相似文献
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《Planning》2014,(10)
本文研究了一个带有负顾客的M/M/1/N多重工作休假排队系统。服务员在假期中以较低的速率服务顾客而非停止工作。利用马尔科夫过程理论和矩阵解法求出了稳态概率的矩阵解,并得到了系统的平均队长、平均等待队长以及顾客的消失概率等性能指标。 相似文献
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石墨烯具有独特的纳米结构和一系列极具吸引力的特性,成为新型纳米复合材料的理想载体,如纳米复合材料分散的基体.提出了一种以石墨,苯胺,四氯化锡为原料制备石墨烯/二氧化锡/聚苯胺的新方法.通过X-射线衍射,红外光谱,透射电子显微镜,扫描电子显微镜以及紫外-可见光谱对合成的材料进行表征.结果表明:二氧化锡纳米粒子原位吸附在石墨烯的表面,有效地避免了石墨烯片的堆叠,聚苯胺加入后可大大提高二氧化锡的电化学性质. 相似文献
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Pseudomonas aeruginosa was isolated consistently from domestic and hospital sewage. In domestic sewage the numbers were usually less than 30,000 per 100 ml whereas counts above 500,000 per 100 ml were frequently obtained in hospital sewage. Correspondingly high counts of Escherichia coli were not found in hospital sewage and the ratio of E. coli to P. aeruginosa was usually less than 25 compared to ratios of over 500 often found in ordinary domestic sewage. During passage through sewage treatment plants the numbers of both bacteria were reduced by about 90% so that their ratio in the effluent remained the same as in raw sewage.In samples from a fresh-water stream the numbers of P. aeruginosa reflected the levels of domestic pollution. Variations in the counts of the organism over the length of the stream usually closely parallelled those of E. coli. However, in samples taken from the stream in lightly populated, agricultural areas P. aeruginosa was frequently not isolated even when the counts of E. coli were high. This was consistent with results from examinations of faecal specimens which confirmed the presence of P. aeruginosa in humans but indicated that in animals the organism was not present in significant numbers. 相似文献
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