应用区域地球物理资料探讨大别山地区地质构造

大别山地区是一地球物理场变异带,大别隆起的北界是桐柏—晓天断裂系,南界是桐柏—浠水断裂系,东界是郯庐断裂系,三个壳型断裂所围截的“V”形三角地块呈—北厚南薄的楔形变质地块,楔于东秦岭褶皱带中。区内主要金银多金属矿产,受桐柏—晓天断裂系和桐柏—浠水断裂系的控制,桐柏—大悟—圻春为—含金聚矿构造带。     

城市环境中的设施与居民的心理和行为

人对环境具有本能的感觉和认知能力,不同环境给予社会群体(指具有一定的文化层次、道德修养、风俗习惯和生活水准等的社会各阶层)的心理感受和行为诱导也各有所异。在当前倡导和谐社会的形势下,构筑良好的城市环境设施,对提高居民的生活环境质量,培养他们健康积极的心理和行为,具有重要的作用和意义。     

Ultraviolet light inactivation of protozoa in drinking water: a Bayesian meta-analysis

To assess the dose of UV light needed to achieve specified levels of Giardia spp. cysts and Cryptosporidium spp. oocysts inactivation in drinking water, a Bayesian meta-analysis is used to analyze experimental data from several studies. Of the 20 studies identified by an extensive data collection effort, 14 (five reported experiments on Giardia and nine on Cryptosporidium) were selected for analysis based on a set of criteria. A substantial amount of the log inactivation data are reported as greater than a given inactivation level (i.e., censored data). The Bayesian hierarchical modeling approach used in this study not only properly addresses the common concerns in a meta-analysis but also provides a robust method for incorporating censored data. Different statistical models will result in different estimates of the UV doses needed to achieve a specific inactivation level. The Bayesian approach allows us to present the uncertainty in terms of risk, which is better suited for supporting US EPA in developing regulations.     

混凝土早期开裂试验方法评述

近年来,开裂问题日益成为混凝土材料研究领域的热点,主要针对国内外混凝土材料早期约束收缩开裂试验研究的进展进行了总结与评述。混凝土约束开裂试验方法的研究已经取得一定进展,但是混凝土开裂是多种因素综合的结果,因此正确评价混凝土的开裂性,还需要从多方面入手,仍需要大量的研究工作。     

现代控制技术在工程机械上应用的探讨

以摊铺机控制系统为例，阐述了CAN总线在工程机械现代控制系统中的应用，并对工程机械远程监控系统作了初步探讨。     

阅读建筑的一种经验——古市徹雄访谈随感

2006年12月在南宁参加“2006当代中国建筑创作论坛”期间,本刊记者(以下简称NA)对古市徽雄教授(以下简称古市)进行了访谈。以下为访谈过程中部分内容的记录。NA:《风、光、水、地、神的设计》中“神”的意义,是更偏重于“god”抑或是“soul”、“spirit”?古市:“神”是一种风土、一种精神、一种文化。“风、光、水、地、神”既是建筑所需要考虑的元素,也是建筑项目的代指。“神的设计”直接     

Cobalt-Encapsulated in Nitrogen-Doped Carbon Nanotubes Prepared by Hydrothermal Method as Catalyst for Hydrogen Evolution

Abstract

Cobalt-encapsulated in nitrogen-doped carbon nanotubes (Co-NCNT) were prepared by hydrothermal method. CoCl₂·6H₂O and graphitic carbon nitride (g-C₃N₄) were used as raw material. Samples containing such defective structures were synthesized by hydrothermal methods, while there is an excellent synergistic effect between cobalt nanoparticles and carbon nanotubes on hydrogen evolution reaction (HER). In order to improving the HER performance, different samples were fabricated by changing the molar ratio of raw materials and pyrolysis temperature. The results show that Co-NCNT has the best HER performances at the ratio of CoCl₂·6H₂O and g-C₃N₄ (1:7) when the pyrolysis temperature reached 700?°C. The overpotential has reached 285?mV when the current density is 10?mA·cm^?2, the Tafel slope of the sample is 103?mV·dec^?1.     

Evaluation of solar temperature field under different wind speeds for Shanghai 65 m radio telescope

The Shanghai 65 m radio telescope is currently the largest full range rotatable radio telescope in Asia. Gravity, wind and temperature are the three main factors which may have a bad effect on the reflector’s surface precision. To study the effect of the thermal deformation caused by daily non-uniform temperature fields on the surface precision of the main reflector, both the temperature field and its effect were studied in detail for two typical days (January 15th and July 15th). The method to simulate temperature fields was studied initially, considering heat conduction, solar radiation, shadowing, air convection, sky radiation and ground radiation. Then, an integral parametric thermal finite element model (FEM) of the telescope was established using the ANSYS thermal analysis module. Finally, the effect of non-uniform temperature fields on the surface precision of the main reflector was estimated in terms of the Root Mean Square (RMS) deformation based on temperature transient analysis. The proposed methods and conclusions drawn can provide valuable information for thermal design, thermal monitoring and thermal control of the Shanghai 65 m radio telescope and other similar giant antenna structures.