共查询到20条相似文献,搜索用时 62 毫秒
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发展建筑机械化事业的目的显然是要多、快、好、省地完成建筑工程的生产任务。若实现建筑机械化后并不能如此,则建筑机械化就失去意义。长期来我国建筑机械化水平较低,提高也较缓慢,这在一定程度上表明我国建筑工程施工还不急需机械 相似文献
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HZD10二次投料砼搅拌站韦庆杰(中国建筑科学研究院机械化所廊坊)陈涛(广西南宁通用机械厂)HZD10二次投料砼搅拌站是在满足精度、生产效率、造价三大因素的前提下,以改进提高和促进我国砼搅拌工艺发展,满足砼二次搅拌工艺需要,由中国建筑科学研究院机械化... 相似文献
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紧跟世界先进水平为建筑机械市场提供一流产品四川省建设机械厂厂长袁著曦《建筑机械化》第四届编委会委员随着改革开放的不断深入发展,我国的基本建设事业展现出蓬勃的生机,如何适应建筑市场的需要,紧紧依靠科学技术,不断研制、开发并生产出质量可靠性能先进的建筑机... 相似文献
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It has been suggested that iron is a limiting factor on bloom-forming cyanobacteria in lake water. Although the availability of iron for phytoplankton depends significantly on its speciation, little is known about iron speciation in natural lake water. We investigated the horizontal distribution and temporal variation of dissolved iron and its chemical speciation in Lake Kasumigaura and its two inflowing rivers. Concentrations of dissolved iron and its organic ligands, determined by cathodic stripping voltammetry, clearly decreased as lake water flowed from the river entry points toward the center of the lake, indicating their riverine origin. The fraction of iron occurring in organic complexes tended to increase with the water flow. These results suggest that most of the dissolved iron in river water forms unstable soluble species, such as inorganic iron; thus, these unstable iron species may be scavenged in the mouths of rivers, and stable organic complexes of iron may flow to the center of the lake. Furthermore, most of the dissolved iron (88.2-99.9%) was present as organic complexes, and the inorganic iron level in Lake Kasumigaura (pFe' value=7.8-13.6) was similar to that observed in the open ocean. This result suggests that iron is an important factor determining the structure of the phytoplankton community in Lake Kasumigaura. 相似文献
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针对某能源仓下煤不顺畅的问题,进行能源仓改造加固,介绍了能源仓及其支撑结构的形式和设计参数,建立了空间有限元模型,对能源仓及其支撑结构在改造加固前后的受力性能进行了分析,并对比分析结果,提出相关数据作为改造加固依据。 相似文献
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20世纪末出现的剖面建筑现象,其外部形态的剖面性强调了空间和建筑形态生成的思考方式。从"功能"(program)和"身体"(body)的感知出发是其两种典型的空间思考方式。这类建筑强调建筑生成的"过程"(process);剖面成为一种思考方式;它重新挖掘了建筑的"概念"(idea),强调建筑图纸和建造的密切关联,对当代实践具有启示意义。 相似文献
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绿色通道及其规划原则 总被引:20,自引:0,他引:20
绿色通道作为一个重要的概念,在保护生态学、城市规划及景观设计学等诸多领域广泛应用.明确了绿色通道的定义、分类、功能及其理论背景,从人-自然关系的视角回顾了绿色通道规划的发展历史,从尺度、目标、构成、网络结构及横向协调等5个方面对绿色通道的规划提出了比较详细的一般性指导原则,将生态、休闲、文化等诸多功能的要求都包含其中,反映了绿色通道研究的最新趋势. 相似文献
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