Evaluation methods of man-machine-environment system for clean and safe production in phosphorus mines: A case study

Phosphorus is an essential element in agricultural production and chemical industry. However, since the risk of casualties and economic loss by mining accidents, the application of clean and safe production in phosphorus mines encounters great challenges. For this purpose, a man-machine-environment system composed of evaluation indexes was established, and the grading standards of indexes were defined. Firstly, the measurements of 39 qualitative indexes were obtained through the survey data. According to the measured values of 31 quantitative indexes, the measurements of quantitative indexes were calculated by linear measurement function(LM) and other three functions. Then the singleindex measurement evaluation matrixes were established. Secondly, the entropy weight method was used to determine the weights of each index directly. The analytic hierarchy process(AHP) was also applied to calculate the weights of index and index factor hierarchies after the established hierarchical model. The weights of system hierarchies were given by the grid-based fuzzy Borda method(GFB). The comprehensive weights were determined by the combination method of AHP and GFB(CAG). Furthermore, the multi-index comprehensive measurement evaluation vectors were obtained.Thirdly, the vectors were evaluated by the credible degree recognition(CDR) and the maximum membership(TMM)criteria. Based on the above functions, methods, and criteria, 16 combination evaluation methods were recommended.Finally, the clean and safe production grade of Kaiyang phosphate mine in China was evaluated. The results show that the LM-CAG-CDR is the most reasonable method, which can not only determine the clean and safe production grade of phosphorus mines, but also improve the development level of clean and safe mining of phosphorus mines for guidance.In addition, some beneficial suggestions and measures were also proposed to advance the clean and safe production grade of Kaiyang phosphorus mine.

真菌在蚊虫防控中的应用研究进展

蚊虫是疟疾、登革热等传染病的重要传播媒介,对人类健康造成严重威胁。基于杀虫剂的化学防治是当前蚊媒疾病媒介控制的主要策略之一,但杀虫剂抗药性的威胁日益严重,迫切需要开发更多的蚊虫控制工具。昆虫病原真菌可作为化学杀虫剂的一种环保替代品,能够通过影响蚊虫的寿命和媒介能力等达到防控蚊虫和蚊媒传染病的目的,也能通过转基因技术对真菌进行改造间接发挥作用。该文对绿僵菌、白僵菌和大链壶菌等主要杀蚊真菌进行介绍,并对其在蚊虫防控中的研究进展进行综述和展望。

胸水ADA及ADA同工酶在结核性胸膜炎中的诊断价值

目的:探讨胸水ADA及ADA同工酶联合胸水淋巴细胞与中性粒细胞比值(L/N Ratio)在结核性胸膜炎中的诊断价值。方法:纳入2019年1月~2019年6月长沙市中心医院收治的155例疑似结核性胸膜炎患者,检测患者胸水ADA和ADA2活性以及胸水L/N。分别比较不同阈值下ADA、ADA2和胸水L/N对诊断结核性胸膜炎的敏感度和特异性。结果:ADA阀值为48 U/L时,诊断结核性胸膜炎的敏感度为90.6%,特异性为88.6%。ADA2阀值为26 U/L时,诊断结核性胸膜炎的敏感度为90.6%,特异性为94.3%。L/N阀值为0.70时,诊断结核性胸膜炎的敏感度为100%,特异性为48.8%。ADA阀值为48U/L结合L/N阀值0.70时,诊断结核性胸膜炎的敏感度为90.6%,特异性为98.4%。ADA2阀值为26 U/L结合L/N阀值0.70时,诊断结核性胸膜炎的敏感度为90.6%,特异性为97.6%。ADA阈值48U/L,ADA2阀值26 U/L结合L/N阀值0.70时,诊断结核性胸膜炎的敏感度为96.9%,特异性为97.6%。结论:ADA、ADA同工酶联合L/N检测分析可以有效早期筛检结核性胸膜炎。

海上风机基础高阶水动力荷载数值模拟研究

在实际海洋环境下,海上风机结构常常承受非线性波浪和系泊系统的联合作用,探究海上浮式风机基础高阶水动力荷载及其运动响应非常重要。该文基于非线性势流理论和摄动展开技术,建立了海上浮式风机基础与波浪和系泊系统耦合作用的二阶时域高阶边界元数值分析模型,研究了OC4-DeepCwind半潜浮式风机基础在波浪作用下的动力响应特性。并通过与已发表数据进行对比,验证了模型准确性。分析计算得到的波浪力和平台运动响应随时间变化的演变特性及其与线性结果的区别,发现某些波频作用下非线性效应影响显著。该研究成果可为海上风电系统及海洋结构物设计提供一定参考。