基于以太网的智能金属管浮子流量计

根据磁阻传感器的角位移测量原理,提出智能金属管浮子流量计的设计方案。该方案采用低功耗MCU和高精度ADC实现对流量的数字化采集和智能控制,应用LMBP算法实现高精度的静态特征曲线拟合;通过裁减TCP/IP协议,在以太网上实现了流量计与用户的数据通信。实际运行表明,设计的流量计系统运行稳定可靠。     

鸭传染性浆膜炎研究进展

鸭传染性浆膜炎是我国近二十年来新出现的一种感染鸭、鹅、火鸡等多种禽类的急性、败血性、接触性传染病,主要感染2-7周龄雏鸭,死亡率高达50%-80%,并因常与其他细菌混合感染,严重影响了养鸭业的发展,造成了巨大的经济损失.本文从鸭传染性浆膜炎的病原、流行病学、病理变化以及预防和治疗等几个方面对该病作了简要的综述.     

面向语义关系的生物文本检索算法

面向语义关系的生物文本检索算法通过从生物文本中自动生成满足一定语义关系的模板，将语义关系提取与文本信息检索技术有机融合，以满足用户对生物语义关系查询的需求．在国际性评测会议TREC Genomics提供的标准数据集上的实验结果表明，该算法可以显著地改善生物文本信息检索的性能（平均检索精度提高15．34N）．     

AB3型储氢合金复合电极材料制备及电化学性能

以La_2Mg_(17)作为中间合金采用熔炼法成功制备了AB_3型合金La_(0．7)Mg_(0．3)Ni_(2．875)Co_(0．525)Mn_(0．1),与球磨法制得的NiB进行不同比例的复合．对合金复合前后的电化学容量、循环寿命、高倍率放电以及电化学交流阻抗(EIS)进行了测试,结果表明储氢材料经NiB复合后,合金电极循环稳定性明显提高,但是其最高放电容量有所降低；高倍率放电能力增强,抗腐蚀性能增强．     

积极探索加快实现供水企业扭亏增盈

文章针对平定县供水管理局运行多年来存在的问题，提出了合理的建议和改进意见。     

常见建筑砌体裂缝原因及其防治

引起砌体结构墙体裂缝的因素很多,既有地基、温度、干缩引起的,也可能是由于设计上的疏忽、施工质量、材料不合格及缺乏经验等造成的．本文简要总结分析了实际工程中遇到的砌体裂缝以及其产生的原因,结合工程实际特点,针对性地提出一些控制裂缝的措施和方法,在工程中具有一定的现实意义。     

西部省区旅游业可持续发展竞争力综合评价研究

根据相关研究成果及研究地区特征，按照构建指标体系数据的可获得性、代表性、全面性、相关性和相对性原则，建立了由政府管理水平与公共服务设施、经济实力、旅游业及第三产业效益、环境水平、开放程度等5个子系统共45个评价指标，基于SPSS12．0大型统计软件，运用因子分析法对西部11个省区旅游业可持续发展竞争力进行了定量评价，指出了其发展优势及制约因素．按照聚类分析法将有序样本聚类为3个类型区，并对不同类型区旅游业可持续发展提出了相应的对策和建议，即一类地区应提升旅游业经营理念，积极发展第三产业；二类地区应加大对外开放力度，整合区域旅游资源；三类地区应提高政府管理水平，加快经济发展步伐，加强旅游产品的营销，提高旅游业发展的宏观规划及微观管理水平。     

Molecular modeling of the ion channel-like nanotube structure of amyloid β-peptide

The ion channel-like nanotube structure of the oligomers of amyloid β-peptide (Aβ) was first investi-gated by molecular modeling. The results reveal that the hydrogen bond net is one of the key factors to stabilize the structure. The hydrophobicity distribution mode of the side chains is in favor of the structure inserting into the bilayers and forming a hydrophilic pore. The lumen space is under the control of the negative potential,weaker but spreading continuously,to which the cation selectivity attributes; meanwhile,the alternate distribution of the stronger positive and negative potentials makes the electrostatic distribution of the structure framework balance,which is also one of the key factors stabilizing the structure. The results lay the theoretical foundation for illuminating the structure stability and the ion permeability,and give a clue to elucidating the molecular mechanism of Alzheimer's dis-ease (AD) and designing novel drugs to prevent or reverse AD at the root.     

我国元数据研究述略

将2000—2006年国内关于元数据的研究归纳为3个方面,并加以阐述。     

Microbial community structure in major habitats above 6000 m on Mount Everest

Bacterial abundance in surface snow between 6600 and 8000 m a.s.l. on the northern slope of Mt. Ev- erest was investigated by flow cytometry. Bacterial diversity in serac ice at 6000 m a.s.l., glacier melt- water at 6350 m, and surface snow at 6600 m a.s.l. was examined by constructing a 16S rRNA gene clone library. Bacterial abundance in snow was higher than that in the Antarctic but similar to other mountain regions in the world. Bacterial abundance in surface snow increased with altitude but showed no correlation with chemical parameters. Bacteria in the cryosphere on Mt. Everest were closely related to those isolated from soil, aquatic environments, plants, animals, humans and other frozen environ- ments. Bacterial community structures in major habitats above 6000 m were variable. The Cyto- phaga-Flavobacterium-Bacteroides (CFB) group absolutely dominated in glacial meltwater, while β-Proteobacteria and the CFB group dominated in serac ice, and β-Proteobacteria and Actinobacteria dominated in surface snow. The remarkable differences among the habitats were most likely due to the bacterial post-deposition changes during acclimation processes.