Non-linear analysis for the freezing–thawing situation of the rock surrounding the tunnel in cold regions under the conditions of different construction seasons, initial temperatures and insulations

In this paper, based on the governing differential equations of the problem of temperature field with phase change, the finite element formulae of this problem are obtained from Galerkin's method. An illustrative example of the temperature field in cold region tunnel under the conditions of the different construction seasons, different initial temperatures, different thicknesses and thermal conductivity of insulation material is provided. Then some significant results are presented, which can provide a reference for actual tunnel engineering designs in cold regions.     

北京地铁五号线炎热季节混凝土拌合物温度综合控制

本文针对炎热季节北京地铁五号线工程对预拌混凝土入模温度的要求（不大于28℃），通过原材料进厂温度控制，配比优化，科学调度、合理选择浇筑时间段，尽量避开高温施工等措施，在驻站监理的监督下．最大可能降低了混凝土出机温度及温度损失，满足了施工要求。     

新自然主义种植理念下的草本植物群落空间研究

新自然主义种植理念下,草本植物群落以低维护和长周期的显著优势在生态智慧城市的建设和城市拟自然景观营造中扮演着越来越重要的角色,因此亟须探索该生态种植理念下草本植物群落空间设计的创新型方法以指导城市拟自然景观的营造。综述新自然主义种植理念下草本植物群落空间设计的发展历程和群落空间设计原则,通过分析新自然主义种植理念下典型草本植物群落种植空间设计案例,归纳每种类型草本植物在群落空间设计中的作用,并以生态种植草本实验基地的4个稳定的草本植物组合为实例,总结4种草本植物群落的空间设计模式,以期将新型草本植物群落生态种植范式应用到未来城市拟自然景观空间的营造中。     

长江临堤复杂深基坑工程设计与施工

武汉时代广场临长江干堤仅60m,基坑开挖面积1.4万m2,开挖深度达19.45m,场地地质条件及周边环境复杂;基坑设计采取综合支护方案,通过精心策划与信息化施工管理,在长江汛期前完成全部地下室工程,成功地化解了深基坑安全与工期风险。     

计算机键盘塑料用模具型腔表面开裂分析

采用外观检查、硬度试验、化学分析和金相检验等方法对计算机键盘塑料用模具型腔表面开裂原因进行了分析。结果表明,该模具的开裂属于典型的应力腐蚀开裂,是由于模具设计不合理、热处理工艺不当和模具背面电火花加工后未进行去应力处理等因素所致。     

某工程基础及钢围堰设计与施工

水中基础施工是桥梁施工中控制工期的重要节点,该文阐述了在枯水期通过先旋挖钻孔施工桩基础再进行钢围堰施工,可避免常规施工方法在钢围堰上搭设钻孔平台进行水上钻孔施工的安全风险,为类似工程提供一定的参考。     

Variation in the volatile terpenoids of two industrially important basil (Ocimum basilicum L.) cultivars during plant ontogeny in two different cropping seasons from India

BACKGROUND: Two Ocimum basilicum cultivars, ‘Vikarsudha’ and ‘CIM‐Saumya’, grown in the Kumaon region of western Himalaya were evaluated for their essential oil yield and composition at different stages of plant growth during two distinct cropping seasons (spring–summer and rain–autumn). RESULTS: The highest yield of essential oil was obtained at full bloom stage in both cultivars in both cropping seasons. The essential oils obtained from different stages in two cropping seasons were analysed by capillary gas chromatography with flame ionisation detection, and gas chromatography–mass spectrometry. The major component of cultivar ‘Vikarsudha’ was methyl chavicol (84.3–94.3%), while for cultivar ‘CIM‐Saumya’ the main components were methyl chavicol (62.5–77.6%) and linalool (14.4–34.1%). CONCLUSION: This study clearly indicated that cultivar, cropping season, plant ontogeny and plant part had significant effects on the yield and quality of the essential oil of O. basilicum. Further, the amount of methyl chavicol in the cultivars grown in this region was higher than in cultivars from other parts of India. Copyright © 2011 Society of Chemical Industry     

抚河中下游流域缺水情况及典型年研究

抚河水量支撑着抚河流域的用水安全,尤其是人口密集、工农业较为发达的抚河中下游流域。通过对水文资料以及其他资料的整理分析,当前抚河中下游流域的缺水干旱呈现以下情况:近10 a来的降雨量有所偏少,干旱缺水频发;年内枯水期和后汛期(农业用水高峰期)均出现缺水问题;持续的社会发展使得对用水的需求保持高位,水资源供需问题不容乐观;年内最低水位下降的现象反映缺水干旱问题有所加重;流域内水利工程调节能力有所提高,但仍显不足。另外,对缺水期抚河径流量和降雨量进行频率分析,分别得出了频率曲线和典型年,2种方法得出的规律较为一致,因土壤前期含水量差异的原因,部分典型年有所差异。     

西安市过渡季节办公建筑室内热环境研究

根据在过渡季节里对所选取的办公建筑进行现场测试所得的数据,并通过分析调查问卷内容得出:西安地区过渡季节气候相对比较舒适。这个季节室内主观热感觉中性温度与当PMV=0时的室内温度值较接近,分别为25.6℃、25.24℃。