浅谈专业数字化图书馆建设

数字图书馆是图书馆发展的主要方向。在我国，数字图书馆建设存在一些问题。探索解决问题的方法和途径，是摆在我们面前的一项任务。     

Production and structural features of a water-soluble polysaccharide from a mutant strain of Agrobacterium sp.

We have developed a mutant strain derived from Agrobacterium sp. ATCC 31750, which produces a water-soluble polysaccharide having potential utility to the food, feed, pharmaceutical and cosmetic industries. A high concentration of product (15 g/L) is obtained by 48 h cultivation of the mutant strain under optimized fermentation conditions. The water-soluble polysaccharide obtained from cultures of the mutant strain beta82 has Glc:Man:Gal in approximate molar ratios of 5.8:6.7:1.0. The molecular weight of the polysaccharide was determined to be approximately 1000 kDa by HPSEC analysis. Linkage analysis contained 3-Glcp, 3-Manp, terminal Glcp and terminal Manp, as well as a small proportion of 3- and 3,4-Galp, and 4,6-Manp residues. Based on analyses using FT-IR and ¹³C NMR spectrometers, most glycosidic bonds joining these sugar residues are of the α-type, and acetyl groups are apparently attached to the polymer chain at random.     

Simultaneous degradation of nitroaromatic compounds TNT,RDX, atrazine,and simazine by Pseudomonas putida HK‐6 in bench‐scale bioreactors

BACKGROUND: Environmental contamination by nitroaromatic compounds such as 2,4,6‐trinitrotoluene (TNT), hexahydro‐1,3,5‐trinitro‐1,3,5‐s‐triazine (RDX), atrazine, and/or simazine (TRAS) generated as waste from military and agricultural activities is a serious worldwide problem. Microbiological treatment of these compounds is an attractive method because many explosives and herbicides are biodegradable and the process can be made cost‐effective. We explored the feasibility of using cultures of Pseudomonas putida HK‐6 for simultaneous degradation of TRAS with the aim of microbial application in wastewater treatment in bench‐scale bioreactors. RESULTS: Experiments were conducted to study the effects of supplemental carbons, nitrogens, and Tween‐80 on the degradation of Ps. putida HK‐6 in media containing TRAS as target substrate(s). The most effective TRAS degradation was shown in the presence of molasses. Addition of nitrogen sources produced a delayed effect for the target substrate(s). Tween‐80 enhanced the degradation of target substrate(s). Simultaneous degradation of these compounds proceeded to completion within the given period. CONCLUSIONS: Ps. putida HK‐6 was capable of growth with TRAS, and the effects of supplements on TRAS degradation and simultaneous TRAS degradation were evaluated in bench‐scale bioreactors. The results of this study have practical applications in the processes of industrial waste stream treatment where the disposal of TRAS may be problematic. Copyright © 2008 Society of Chemical Industry     

长液信息化建设项目情况简介

1项目背景1.1公司面临的内外形势一方面,市场竞争加剧,客户对时间、价格、质量及个性化服务的要求越来越苛刻,市场瞬息万变,定单忽多忽少;另一方面,企业生产计划不准确,订单无法及时交付,库存积压严重。企业粗放式的管理造成产品成本居高不下,效率降低,越来越不能适应市场的需要,企业在行业中的排名也逐年下滑。     

一种攻丝丝锥的改进设计及试验

本文叙述了普通标准丝锥攻丝高韧性金属材料的困难性和存在的问题,针对该种金属材料的机加工特性,对丝锥材料的选择及其结构形式进行了改进设计和试验,并提出了攻丝加工的工艺参数和相应措施.     

常压渣油热反应过程中胶体的稳定性

利用质量分数电导率方法研究了中东和克拉玛依常压渣油在热反应过程中胶体的稳定性。结果表明，随着反应时间的增长，在热反应生焦诱导期内，渣油的胶体稳定性迅速下降；开始生焦后，胶体稳定性缓慢下降。从中东常压渣油的SARA四组分的数均相对分子质量、碳氢元素组成、平均芳碳率等方面探讨了中东常压渣油在热反应过程中胶体稳定性下降的原因。结果表明，在热反应中，由于裂解和缩聚反应的共同作用，使渣油的沥青质和饱和分含量上升，芳香分含量下降，胶质含量变化不大；随着热反应的进行，四组分的数均相对分子质量均呈下降趋势，导致了渣油胶体稳定性的下降并发生生焦反应。     

DVB-S接收系统中包同步机制的分析与实现

本文对DVB-S接收系统中包同步搜索机制的进行了深入细致的研究，分析了相关参数对搜索性能的影响，并给出一种高效且节省资源的实现结构。     

Treatment of low turbidity water by sweep coagulation using bentonite

A novel strategy of sweep coagulation to treat low turbidity water is presented herein. Study findings demonstrated that an Na⁺‐saturated bentonite with medium cation exchange capacity (CEC) resulted in significant turbidity removal at a bentonite dosage of 30 mg dm^?3. Bentonite dispersion with fully delaminated platelets tended to undergo a more porous type of coagulation with intense face‐to‐face interactions of platelets and effectively entrapped TiO₂ particles in band‐type structures. This type of coagulation usually results in a large volume of settled flocs with a fluffy structure and excellent turbidity removal efficiency for sweep coagulation. The sign and magnitude of electrical charge on TiO₂ particles has a minor effect on the efficiency of sweep coagulation. Copyright © 2005 Society of Chemical Industry     

从事放射性个人剂量监测分析与防护调查

为了能及时了解放射性工作人员的受照剂量，以便能够更好地保障放射工作人员的健康与安全，采用热释光测量法对包头地区从事放射性工作的工作人员进行了个人剂量监测，并对他们的剂量当量频数分布进行了统计与分析，对工作环境的防护进行了调查对比，就今后的工作提出建议。