生命科学建筑及其发展趋势

用作生命科学研究的建筑物需要有专门的建设和服务元素的介入．才能提供和创造符合工艺流程状况的设施和环境。其中的专业实验室。布置时应针对用户进行环境定制和专业设施配置,并为对生物生命各个方面的高端观察提供便利。在分析生命科学建筑的特征厦发展趋势的同时,对其内部空间的使用进行了调查,为生命科学建筑设计提供佐证。     

村庄规划可实施性的反思与对策

当前村庄规划普遍存在实施效果不理想的问题,主要原因是村庄规划缺少地域性、科学性、协调性.应不断更新规划观念,丰富规划设计手段,通过增加产业规划、把握特色规划、制定建设计划、实施阳光规划和完善跟踪机制等措施提高村庄规划的可实施性.     

无线网络化温度传感系统设计

本文介绍了一种由网关、无线通信模块、单片机温度测控单元构成的多点温度无线远程测控系统。文章阐述了系统的功能、组成。介绍了无线数据传输协议及部分软件设计。     

PG-2, a Potent AMP against Pathogenic Microbial Strains,from Potato (Solanum tuberosum L cv. Gogu Valley) Tubers Not Cytotoxic against Human Cells

In an earlier study, we isolated potamin-1 (PT-1), a 5.6-kDa trypsin-chymotrypsin protease inhibitor, from the tubers of a potato strain (Solanum tuberosum L cv. Gogu Valley). We established that PT-1 strongly inhibits pathogenic microbial strains, but not human bacterial strains, and that its sequence shows 62% homology with a serine protease inhibitor. In the present study, we isolated an antifungal and antibacterial peptide with no cytotoxicity from tubers of the same potato strain. The peptide (peptide-G2, PG-2) was isolated using salt-extraction, ultrafiltration and reverse-phase high performance liquid chromatography (RP-HPLC). Matrix-assisted laser desorption/ionization time-of-flight mass spectrometry (MALDI-TOF/MS) showed the protein to have a molecular mass of 3228.5 Da, while automated Edman degradation showed the N-terminal sequence of PG-2 to be LVKDNPLDISPKQVQALCTDLVIRCMCCC-. PG-2 exhibited antimicrobial activity against Candida albicans, a human pathogenic yeast strain, and Clavibacter michiganensis subsp. michiganensis, a plant late blight strain. PG-2 also showed antibacterial activity against Staphylococcus aureus, but did not lyse human red blood cells and was thermostable. Overall, these results suggest PG-2 may be a good candidate to serve as a natural antimicrobial agent, agricultural pesticide and/or food additive.     

纳米b-Ni(OH)2的制备及其储锂性能

以Ni(NO₃)₂·6H₂O和NaOH为原料采用化学沉淀法制备了Ni(OH)₂电极材料。采用X射线衍射(XRD)和场发射扫描电子显微镜(FESEM)表征了样品的微观结构,结果表明该样品是具有片状纳米次级结构的β-Ni(OH)₂。采用循环伏安(CV)和电化学充放电测试研究了该β-Ni(OH)₂样品的储锂性能,结果发现该样品作为锂离子电池负极材料具有非常高的储锂活性,在50 mA·g^-1电流密度下其第3次循环放电比容量高于1550 mA·h·g^-1;样品电极中的碳含量对其循环性能和倍率性都有显著影响,通过交流阻抗(EIS)测试分析了样品电极中碳含量的作用机理。     

ZnF2包覆对锂离子电池正极材料LiNi0.5Mn1.5O4的性能影响

本文用溶胶凝胶法制备了LiNi0.5Mn1.5O4正极材料,然后用ZnF2对其进行表面包覆。XRD测试表明,包覆处理没有影响材料的晶体结构,EDS、SEM和TEM测试表明,2wt%ZnF2在LiNi0.5Mn1.5O4表面形成了约7 nm厚的均匀包覆层。对未包覆、1wt%、2wt%、3wt%包覆后的材料进行电化学性能测试对比,发现包覆后都能减弱电解液与基体间的相互作用,较大地稳定电极表面,提高了材料的电化学性能。其中,2wt%ZnF2包覆样品表现出最佳的电化学性能,0.2 C倍率下循环200圈后,其放电比容量维持在109 mAh/g,容量保持率为79.7%;在10 C时,放电比容量依然高达102.1 mAh/g;5 C高倍率下循环500圈后,放电比容量维持在94.2 mAh/g,容量保持率为85.6%。     

Local thermal sensation and comfort study in a field environment chamber served by displacement ventilation system in the tropics

This paper presents a study of local thermal sensation (LTS) and comfort in a field environmental chamber (FEC) served by displacement ventilation (DV) system. The FEC, 11.12 m (L)×7.53 m (W)×2.60 m (H), simulates a typical office layout. A total of 60 tropically acclimatized subjects, 30 male and 30 female, were engaged in sedentary office work for 3 h. Subjects were exposed to three vertical air temperature gradients, nominally 1, 3 and 5 K/m, between 0.1 and 1.1 m heights and three room air temperatures of 20, 23 and 26 °C at 0.6 m height. The objective of this study is to investigate the mutual effect of local and overall thermal sensation (OTS) and comfort in DV environment. The results show that in a space served by DV system, at OTS close to neutral, local thermal discomfort decreased with the increase of room air temperature. The OTS of occupants was mainly affected by LTS at the arm, calf, foot, back and hand. Local thermal discomfort was affected by both LTS and OTS. At overall cold thermal sensation, all body segments prefer slightly warm sensation. At overall slightly warm thermal sensation, all body segments prefer slightly cool sensation.     

金属铟提高Cu-Al合金抗失泽能力机理的研究

本文采用常规腐蚀试验与电化学试验方法以及金相、X射线衍线、电子探针等分析方法研究了含铟的Cu-Al合金在人工汗液中抗失泽能力的机理。结果表明,铟能细化合金的晶粒,并使合金呈现均匀腐蚀,减弱合金的择优取向;合金中存在富铟偏析相,这些相影响合金的失泽行为。     

塔里木盆地奥陶系生物礁的发现及其意义

通过对塔里木盆地野外地质露头的考察和岩心的观察以及地震剖面的解释 ,在奥陶系发现了大量的生物礁。生物礁的分布地区和层位存在着规律性 ,从层位上来看 ,生物礁主要分布在中、上奥陶统 ;从地区来看 ,主要分布在塔中、轮南、巴楚、阿尔金断隆和库鲁克塔格地区。造礁生物主要有层孔虫、苔藓虫、珊瑚、蓝绿藻、管孔藻、托盘类、海绵 ,附礁生物主要有角石、腹足、棘皮、介形虫、瓣鳃、腕足、海百合、藻类、三叶虫、头足类 ,不同地区造礁生物和附礁生物组合是有差异的。生物礁发育的环境是台地边缘和台地内部相对高的地方。生物礁的发现无论在实践中还是在理论上都具有很重要的意义。图 2表 1参 4