CHARACTERISTICS OF QUATERNARY AMMONIUM RESISTANT BACTERIA FROM A FINE PAPERMACHINE SYSTEM

To evaluate the biocide effect of quaternary ammonium chloride (QAC), a whitewater sample was taken from a fine papermachine headbox. By plate spreading method, 51 strains of facultative anaerobe were isolated morphologically. Then the strains were separately transferred to basal medium and were incubated before the beginning of log phase. To identify strains with different QAC resistance, 30-120 ppm of N-Alkyl-benzyl-dimethyl ammonium chloride were added to basal medium.Biocide effect was investigated by comparison of bacterial growth, which can be monitored by 600 nm light absorbance of basal medium suspension. Among 51 strains, only 2 strains can Survive for QAC concentration up to 120 ppm. API20E aud 16S rRNA gene sequencing technique were applied to identify two strains with highest (120 ppm)QAC resistance. One strain (HB22)was identified as Morganella morganii. HB22 can resist QAC concentration up to 150 ppm. HB22 is Gram-negative rod, motile with flagella, catalase positive, oxidase negative, Indole positive, H2S production negative, facultative anaerobe. HB22 has optimum growth condition of 35℃ and pH 7.0.HB22 can catabolize only glucose and D (+)-Mannose.The other (HB45) was identified with high similarity among Pseudomonas cf. monteili or Pseudomonas mosselii or Pseudomonas putida. HB45 can resist QAC concentration up to 200 ppm.HB45 is Gram-negative rod, motile with flagella,catalase positive, oxidase negative, Indole negative,H2S production negative, aerobe. HB45 has optimum growth condition of 30℃ and pH 7.4. HB45 can catabolize L-Arabinose, L(+)-Rhanmose, D (+)-Mannose, Glucose, Glycerol, Lactose, Maltose,Raffmose, Xylose, Cellulose and Xylan. The implication of this work to paper industry is also discussed.     

PIC系列单片机片内定时器实时时钟的实现

针对直接用单片机片内定时器作实时计时不准问题，本文提出了一种可以获取与秒成整数倍关系的定时器溢出信号的方法，同时克服定量溢出中信号被其它中断暂停所受的计时影响，实验表明，在4MHz晶振下，计时误差可控制在每天14s以下，本方法也适用于一般的单片机，在PIC87系列上的实验结果表明效果很好。     

Research on Tracing Evaluation System in Virtual Enterprise Based on Neural Network

The tracing evaluation index system was designed to be used in virtual enterprise and established neural network trace evaluation model. As a result, it was more simple and nicer than the traditional method, so it had wider application foreground.     

制造企业ERP系统柔性集成机制探讨

结合现代制造企业运营和管理方式的发展趋势,提出了新型ERP系统所必须的主体功能体系.为使ERP系统的集成方法具有相当的柔性以满足ERP系统与制造企业运营方式变化相适应的要求,基于ESP规则的基本框架,设计了一种新的ERP系统的集成方式,该方法在静态主体功能体系的基础上,理顺每个功能的处理逻辑,在运营方式发生变化时,通过修改ESP规则来实现系统功能模块的动态集成,并给出应用实例说明了该方法优良的模块性和灵活性.     

聚乙二醇(PEG)活化及其在药物释放和反应载体中的应用

本文综述了PEG羟基活化的方法，包括羟基转换为醛基、胺基、叠氮基、弄赢改酯基、羧基、烯基以及一些易离去基团如卤素、对甲苯磺改基等，并简述了其在药物释放和反应载体方面的应用研究最新进展。     

山西省吕梁区灌溉用水定额的编制

文章以调查典型县现状年灌溉用水定额为基础 ,以当地灌溉水可利用量为控制条件 ,采用逐级平衡的办法 ,制定吕梁区主要作物的灌溉用水定额     

改进VFP性能的几项实用技术

本文根据作者近几年的教学实践和实际开发经验,从优化、提高VFP性能的目标出发,介绍一些实用技巧和技术,从而大大改进Visual FoxPro的性能,提高数据的访问速度.     

NIPA类共聚温敏水凝胶中水的状态和耐热性

用N-异丙基丙烯酰胺（NIPA）与丙烯酸钠（SA）及甲基丙烯酸钠（SMA）共聚合成了两个系列的水凝胶，研究了共聚组成与水凝胶基本性质的关系，并用示差扫描量热法（DSC）和热失重法（TG）研究了此类水凝胶中水的状态和耐热性。     

APCI5000电气自动化成套装置设计

电气自动化成套装置种类繁多，并广泛应用于电力系统．结合现场实际商业运行期所积累的经验，并根据市场预测以及目前工控机发展动态，提出了采用APCI5000工业控制计算机实现电气自动化成套装置设计的最佳方案．     

搜寻平面机构中虚约束的拆杆组法

本文根据机构的组成原理,提出一种搜寻机构中虚约束的新方法一拆杆组法,用该方法能方便地判断出机构中所含的虚约束,同时能迅速排除含有特定几何条件而实际上并不存在虚约束的机构.