磷化氢作为昆虫呼吸毒剂的生化研究进展

就近年来国内外对磷化氢作为昆虫呼吸毒剂的生化研究热点问题 ,如昆虫对磷化氢的吸收 ;磷化氢在昆虫细胞内的分布 ;磷化氢抗性昆虫品系对磷化氢吸收量降低与主动排除机制的关系 ;磷化氢与线粒体呼吸酶系的相互作用等进行综述 .它将对未来研究磷化氢生化毒理学和进一步科学使用磷化氢熏蒸剂以及研制与开发新型熏蒸剂具有重要意义     

高维有噪频谱有限函数的外推

给出的定量既适合于一维与高维,又适合于有噪与无噪的频谱有限的频谱有限函数的外推,是对Ｓａｎｚ－Ｈｕａｎｇ两个猜想的改进,同时讨论了外推函数与真函数的逼近关系,对于一个一维或高维Ω频谱有限函数ｆ,如果仅知道它在局部区域Ｔ上的有噪测量值ｆ,用集合「ｇ：ｇ是Ω频谱有限函数,在Ｔ上｜ｇ（ｔ）－ｆ（ｔ）｜≤δ」（δ≥０）中Ｌ＾２范数最小的元素ｈδｆ作为外推函数,给出了关于它的逼近定理及其范数逼近公式,并且给     

IMT—2000系统网络概述

简要介绍了国际电联 (ITU)建议的 IMT- 2 0 0 0网络技术方面的特点 ,以及 ITU的相关建议制订情况 ,阐述了IMT- 2 0 0 0家族的概念、网络的兼容和过渡及网络实现的原则和方案。     

FCC FAMILY TECHNOLOGY BRIDGING PETROLEUM REFINING WITH PETROCHEMICAL INDUSTRY

Since the demand of lightolefins as petrochemical raw feedstocks is increasing,FCC is being extend-ed to a lightolefin generator from conventional transportation fuel production.In recentyears,a seriesof FCC family technologies,such as DCC,MGG and CPP,have been developed by the Research Instituteof Petroleum Processing( RIPP,SINOPEC) for the production of lightolefins from the heavy hydrocar-bons.Up to now,several commercial DCC and MGG units have been puton stream inside and out…     

Characterization of plasticized PMMA-LiBF4 based solid polymer electrolytes

Polymer electrolyte films prepared from poly(methyl methacrylate) and LiBF₄ with different concentrations of plasticizer (DBP) are described. The formation of polymer-salt complex has been confirmed by FTIR spectral studies. The temperature dependence of conductivity of polymer films seems to obey the VTF relation. Values of conductivities of the polymer complexes are presented and discussed.     

Effect of ZrO2 on conductivity of PVC-PMMA-LiBF4-DBP polymer electrolytes

The preparation and characterization of composite polymer electrolytes of PVC-PMMA-LiBF₄-DBP for different concentrations of ZrO₂ have been investigated. FTIR studies indicate complex formation between the polymers, salt and plasticizer. The electrical conductivity values measured by a.c. impedance spectroscopy is found to depend upon the ZrO₂ concentration. The temperature dependence of the conductivity of the polymer films seems to obey the VTF relation. The conductivity values are presented and results discussed.     

An approach for assessing human decision reliability

This paper presents a method to study human reliability in decision situations related to nuclear power plant disturbances. Decisions often play a significant role in handling of emergency situations. The method may be applied to probabilistic safety assessments (PSAs) in cases where decision making is an important dimension of an accident sequence. Such situations are frequent e.g. in accident management. In this paper, a modelling approach for decision reliability studies is first proposed. Then, a case study with two decision situations with relatively different characteristics is presented. Qualitative and quantitative findings of the study are discussed. In very simple decision cases with time pressure, time reliability correlation proved out to be a feasible reliability modelling method. In all other decision situations, more advanced probabilistic decision models have to be used. Finally, decision probability assessment by using simulator run results and expert judgement is presented.     

面向体验的产品族形象研究

分析了体验的内涵,对产品族的概念进行拓展;定义了产品族形象,提出基于核心理念层、中间特征层和外在综合表现层的产品族形象构成模型,产品族特征平台是产品族形象的基础;构建了以情境知识型线索和身体体验型线索为主体的产品族形象线索模型。     

气相石蜡聚合在流化床催化反应器中的数学模型和先进控制

In this study, the developments in modeling gas-phase catalyzed olefin polymerization fluidized-bed reactors （FBR） using Ziegler-Natta catalyst is presented. The modified mathematical model to account for mass and heat transfer between the solid particles and the surrounding gas in the emulsion phase is developed in this work to include site activation reaction. This model developed in the present study is subsequently compared with well-known models, namely, the bubble-growth, well-mixed and the constant bubble size models for porous and non porous catalyst. The results we obtained from the model was very close to the constant bubble size model, well-mixed model and bubble growth model at the beginning of the reaction but its overall behavior changed and is closer to the well-mixed model compared with the bubble growth model and constant bubble size model after half an hour of operation. Neural-network based predictive controller are implemented to control the system and compared with the conventional PID controller, giving acceptable results.