Fuzzy reasoning Petri nets

This paper presents a fuzzy reasoning Petri net (FRPN) model to represent a fuzzy production rule-based system. The issues of how to represent and reason about rules containing negative literals are addressed in the proposed PN model. The execution rules based on the model are defined formally using the operators in max-algebra. Then, a fuzzy reasoning algorithm is proposed to perform fuzzy reasoning automatically. The algorithm is consistent with the matrix equation expression method in the traditional PNs and allows one to exploit the maximum parallel reasoning potential embedded in the model. The legitimacy and feasibility of the proposed approach are proved and validated through a turbine fault diagnosis expert system.     

安钢宽板坯连铸机达产实践

分析了安钢宽板坯连铸机在热试车期间出现的生产问题,总结出制约生产主要因素,制定针对性措施,使该连铸机在较短时间内实现达产创效.     

Densitometry determination of dioxins using gold nanoparticlemodified dioxin response element probes

This study aims to develop a rapid and sensitive densitometry bioassay of dioxins. It is known that dioxin ligand can bind heterodimeric aryl hydrocarbon receptor (AhR) and trigger the formation of the complex of dioxin-AhR, AhR nuclear translocator (Arnt), and dioxin-responsive element (DRE). We have established a rapid and sensitive method using nanoparticle-modified DRE probes based on dioxin-dependent binding of DRE to AhR complex. Dioxins can trigger the binding of nanoparticle-modified DRE probe to AhR complex. The nanoparticle-modified DRE probes in the dioxin-AhR-Arnt-DRE complexes immobilized on the microplates were detected by measuring optical density after silver enhancement. Results showed that as little as 0.01 pM of TCDD could be detected. Dioxins could be quantified accurately with the linear range from 1 nM to 0.01 pM. The coefficient of variation was 5≈8% in this bioassay. The optical density of nanoparticle-based silver enhancement was produced in a dose- and time- dependent manner. The dioxin concentrations in fly ash samples determined by this bioassay were comparable with that by the standard HRGC/HRMS. Thus this bioassay is a sensitive and convenient cell-free bioassay of dioxin that is suitable for screening of dioxins in environmental or food matrices.     

光隔离器及其相关的磁光材料

本文简要介绍了磁光隔离器的理论、结构和分类 ,并提出了该器件今后发展的几个问题 ,最后介绍了几种磁光材料     

由呼出气中的氡浓度估计铀矿工体内~(225)Ra的负荷量

本文测量了某铀矿不同工种的56名矿工下矿井作业前的呼出气中的~(222)Rn浓度,并由此估算了他们体内的~(226)Ra 负荷量。按不同工种的人数加权,呼出气中的~(222)Rn 浓度平均值为34.1Bqm~(-3),体内~(226)Ra 负荷量的均值为1.95kBq。同时还对9名休息了2天的和2名离开井下作业3—4年的矿工以及12名来下过矿井的本矿工人呼出气中氡浓度进行了测量,由此估算出其体内~(226)Ra 负荷量的均值分别为1.11、0.94和0.17kBq。     

FH-5A 加氢精制催化剂的研制

为适应加工高硫馏分油的需要，研制成功了加氢精制催化剂FH－5A。该剂以含硅氧化铝为载体、Mo-Ni为活性组分，并添加少量助剂而制得。FH－5A工业放大催化剂在氢分压3．4MPa、空速2．5h^-1、反应温度350℃的加氢条件下在小型装置处理伊朗催化裂化柴油和沙特轻质直馏柴油的混合油（30：70），可将原料油中硫含量由9000μg/g，氮含量由432μg/g降至47μg/g。评价试验表明，FH－5A加氢精制催化剂可满足中东高硫直馏柴油、二次加工柴油及其混合柴油加氢精制的需要。     

经济边际在油气资源勘探开发中的应用方法研究

油气资源勘探开发的经济边际分析是从石油企业的边际利润出发，确定石油企业的最优投入产出水平，为作出科学的投资决策和生产决策提供依据，界定了有关油气资源勘探开发经济边际的概念和内涵，探讨了石油企业边际成本和边际收入的确定方法。     

二滩水电站地下厂房洞室的施工特点

国际承包商在二滩工程中的许多施工布置和方法，施工技术和工艺、施工设备和措施很具有特色，扩展了我们的视野、丰富的我们的思路。总结其经验，可作为国内类似工程的参考。