Effectiveness analysis of a mixed rumor-quelling strategy

Circulating the truth and quarantining a subset of rumor spreaders are two major rumor-quelling strategies. In practice, a mixture of the two strategies may be more effective than any one of the two strategies. This paper focuses on effectiveness analysis of the mixed strategy. For this purpose, we are going to establish a rumor-truth competing model on two-layer network. First, we introduce a Markov model characterizing the stochastic dynamics of the rumor-truth competing process, and write the corresponding Kolmogorov model capturing the expected dynamics of the rumor-truth competing process. Second, we give a bilinear model as the first approximation to the Kolmogorov model, and suggest a generic model as a more accurate approximation to the Kolmogorov model. The two models are the focus of concern in this work. For ease in treatment, we describe a limit system of the generic model. By studying the limit model, we present a criterion for the rumor to subside, a criterion for the rumor not necessarily to subside, and a criterion for the rumor to persist, respectively. These findings are instructive to the quelling of false rumors. Finally, through computer experiments we find that when a rumor subsides, the bilinear model is a good approximation to the Kolmogorov model.     

SDD探测器在X荧光分析系统中的应用

介绍了硅漂移（SDD）探测器在X荧光分析系统中的应用,与SI-PIN探测器在能量分辨率、计数率等性能指标上的对比,以及在系统检出限上的实验对比,SDD探测器在性能指标及检出限上有着较大的优势。     

Effect of oral ingestion of different forms of silver on tissue content of some essential elements in chicks

Silver is ingested in India in the form of varak, Ayurvedic bhasm and water contained in silver utensils, but nobody knows their effects. We have examined the effect of interaction of silver ingested in the form of varak (leaf), bhasm (ash) and water (colloidal solution) on some essential elements (Na, K, Ca, Mg, Cu, Fe and Zn) in blood, liver, spleen and kidneys of chicks. The results showed significant rise of silver in all the tissues and significant fall in copper in the blood. The greatest rise was obtained in blood silver by silver sol while it had the lowest amount of silver. Iron significantly increased in tissues but somewhat decreased in blood. Zinc content increased in all the tissues by leaf and ash but decreased by sol. No consistent pattern was seen in case of other elements.     

分银炉的准确控制

结合实际生产情况,提出对分银炉传动机构的电气控制线路进行改造,使操作更方便,刹车更迅速,提高了银转炉的转动准确度。     

某采矿企业X射线人体安检仪应用的辐射监测和分析

随着世界范围内安全形势日趋严峻,利用X射线进行人体安全检查已成为目前最有效的手段之一。为掌握X射线人体安检仪应用对受检人员的辐射影响,笔者对某采矿企业应用的此类设备进行辐射监测,监测结果表明X射线人体安检仪应用对受检人员的辐射影响满足国家标准剂量管理规定和审管部门的剂量管理要求。在监测结果评价的基础上,笔者对X射线人体安检仪应用的正当性进行了讨论,并提出了此类设备应用上的一些建议和值得注意的问题。