A NEW CHARACTERIZATION OF FIXED MODES FOR DECENTRALIZED CONTROL SYSTEMS

In this paper,a study of the characterization of fixed modes in decentralized control ismade.A new sufficient and necessary condition for the existence of fixed modes is obtained by meansof the generalized eigenvalue theory of matrix pairs,and the computability of the new condition ispresented.The results show that fixed modes can be computed in a reliable and efficient manner.     

化工过程培训仿真器的新型软件构造模式与C＋＋实现

本文提出了一类基于微机网络的化工过程仿真培训器的软件构造模式及用面向对象的Ｃ＋＋语言的实施方法。在提出的仿真器中：（１）过程按工艺流程切割为若干个独立的部分，分别建模，并在不同的学员操作站（下位机）运行，而过程间的物料、能量及信息耦合由下位机间的通讯实现；（２）根据下位机上运行的具体模型，配备相应的操作画面，形成一个相对独立的操作岗位；（３）教师指令台（上位机）仅承提对中个操作站的监控职能，如冻结、评分、引发事故等。由于该类仿真器中模型被分解为小规模的模块分散独立运行，过程数学模型和学员操作环境合二为一，极大地减少了通讯数量，显著地改进了仿真器的可靠性和运行速度，增强了微机对大型过程细微仿真的适应性     

L—山梨糖发酵中的芽孢杆菌噬菌体及抗噬菌体菌株的选育

从济南制药厂L—山梨糖混合发酵液中分离得到四株芽孢杆菌噬菌体,其中一株来自寄主巨大芽孢杆菌,三株来自腊状芽孢杆菌,这些噬菌体都是有尾的,根据形态可分为二类。通过选育获得了几株抗噬菌体菌株,经摇瓶混合发酵试验,表明抗株不但具有稳定的抗性而且保持了原种的性能。     

Production and characterization of antibody against aflatoxin M1

Antibody against aflatoxin M1 was obtained after immunization of rabbits with bovine serum albumin-afla M1 oxime conjugate. The antibody has greatest binding efficiency for afla M1, and was less efficient for afla B1. Cross-reaction of antibody with aflatoxin Q1, aflatoxicol, and aflatoxin B2a was weak. Aflatoxin B2, G1, and G2 and afla B1-guanine adducts showed almost no cross-reaction with the antibody. The sensitivity of the binding assay for aflatoxin M1 detection is in the range of 1-10 ng per assay. Detailed methods for the preparation of the conjugate, production of immune serum, and methods for antibody determination are described.     

Quantitative reactivity profiling predicts functional cysteines in proteomes

Cysteine is the most intrinsically nucleophilic amino acid in proteins, where its reactivity is tuned to perform diverse biochemical functions. The absence of a consensus sequence that defines functional cysteines in proteins has hindered their discovery and characterization. Here we describe a proteomics method to profile quantitatively the intrinsic reactivity of cysteine residues en masse directly in native biological systems. Hyper-reactivity was a rare feature among cysteines and it was found to specify a wide range of activities, including nucleophilic and reductive catalysis and sites of oxidative modification. Hyper-reactive cysteines were identified in several proteins of uncharacterized function, including a residue conserved across eukaryotic phylogeny that we show is required for yeast viability and is involved in iron-sulphur protein biogenesis. We also demonstrate that quantitative reactivity profiling can form the basis for screening and functional assignment of cysteines in computationally designed proteins, where it discriminated catalytically active from inactive cysteine hydrolase designs.     

Li~+增强SrWO_4:Er~(3+)-Yb~(3+)上转换发射的研究

采用化学共沉淀法制备了纳米晶Sr WO4:Er3+/Yb3+/Li+发光粉体.室温下观察到Er3+的特征发射和上转换发射,强发射带分别对应着2H11/2-4I15/2,4S3/2-4I15/2和4I13/2-4I15/2能级跃迁.研究了Li+的掺入使Sr WO4:Er3+/Yb3+样品的上转换发光强度增加的原因.     

地震荷载作用下核级(IE)蓄电池电气性能研究

简要介绍核级蓄电池模拟地震试验的试件选择、安装环境的模拟以及试验的基本程序,重点讨论地震荷载作用期间蓄电池连续放电特性,以及试验前后蓄电池容量的考核等特性问题。验证了样机设计的可靠性及合理性,为改进设计及现场安装提供了依据。还论证了国产蓄电池应用在核电领域中的可行性。     

富锗煤烟灰中的锗含量测定

建立了湿法消解-电感耦合等离子发射光谱法(ICP-AES)测定富锗煤烟灰中锗含量的方法,研究了样品预处理、进样系统、光谱干扰、等离子体测定条件对测定结果的影响.在优化实验条件下,方法的相对标准偏差0.79%,加标回收率98.55%~105.85%,表明该方法具有较好的准确度和精密度.