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《Planning》2013,(21)
<正>初冬季节,记者慕名来到了双城市团结乡育新村,这个村是双城市至团结乡公路通过的地方。今年正是村里的赶集日,这里显得非常热闹。水泥路面两旁已安上了路灯。在集市上,我们打听这个村的书记,有一位姓徐的农民告诉我们,他叫邵玉库。今年44岁的邵书记,是在外打工和搞建筑25年后回家建设家乡的。2011年当选为村党支部书记,我们村有11000亩土地、3100人、739户;村里虽然有 相似文献
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春晓镇慈岙村,这个浙江宁波北仑区靠海的小乡村从2013年4月中旬开始频繁出现在微博和各种建筑类网络媒体上,因为那里盖了一座与众不同的“农民自建房”(图1)。 相似文献
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建筑业是江苏省海门市的支柱产业。近几年来海门市不断完善和深化建筑企业的改制,在深化建筑企业改制中抓住企业产权制度这个中心,选准突破口实现重点突破,主要是实现五个实破。 一、产权界定上的突破 建筑企业存量资产中,乡镇(村)或主管部门的原始投入和历年追加投入,均界定为乡镇(村)或主管部门所有。 建筑企业按政府有关规定历年享受的税费金,转让入“盈余公积”并已核销的余额,均界定为乡镇(村)或主管部门所有。 除上述两项外,对历年积累形成的增值资产,乡镇(村)或主管部门有原始投入的,一类企业(净资产1000万元… 相似文献
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在全球气候变化的挑战面前,绿色建筑是最重要的应对领域;在实现到2020年我国单位国内生产总值二氧化碳排放比2005年下降40%-45%目标的征途上,绿色建筑肩负重任;在建设低碳生态城市的进程中,绿色建筑将作出重大贡献。从这个意义上说,我们为推广绿色建筑所做的一切努力,将无隗于现在,也必将无隗于后人。 相似文献
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以一个典型工程为背景,通过现场监测,总结了嵌岩地下连续墙的受力和变形特征,并与普通地连墙进行比较,发现嵌岩地连墙在嵌岩位置会出现很大的负弯矩,对其设计起控制作用;通过理论计算分析了墙厚和嵌岩深度对墙体受力的影响,发现加大墙厚可以在一定程度上减少变形,但是会大大增加墙身受力特别是嵌固段的负弯矩;一定的嵌岩深度有助于提高围护结构的稳定和减少变形,但达到一定深度后再增大嵌岩深度并不能改善支护结构受力;根据施工阶段的变形监测,利用有限元方法对地连墙嵌岩段进行受力分析,结果表明在基岩顶面地连墙会出现应力集中,但是区域不大,设计时可以考虑一定的塑性应力重分布. 相似文献
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The effects of different concentrations (10-5 - 10-2 M) of copper sulfate on root growth, cell division and nucleoli in root-tip cells of Helianthus annuus L. were investigated. Cu had an inhibitory effect on the root growth at 10-4 - 10-2 M during the entire treatment. Cu has toxic effects on chromosomal morphology including anaphase bridges and chromosome stickiness and on nucleoli, causing some similar silver-stained particulate material scattered in the nuclei. Once the nucleolus is poisoned, showing some silver-stained particles scattered in the nucleus, the root growth of H. annuus is obviously inhibited. And once more silver-stained particles appear in the nucleus, the root growth is almost or completely stopped. The possible mechanism of the Cu poisoning of root-tip cells of H. annuus is also briefly discussed. 相似文献
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本文采用框剪结构的并联铁摩辛柯梁模型,从结构总势能出发,求得框剪结构非连续化假定下协同分析的哈密顿对偶体系,由两端边值问题精细积分法中的区段混合能矩阵推导出结构的层单元刚度矩阵,利用有限元刚度集成法形成总刚矩阵;然后采用初值问题的精细积分法对框剪结构进行动力时程分析,并采用Matlab编制相应的程序。以某10层框剪结构为例,验证了本文方法的可靠性与可行性,本方法也适用于其它高层建筑结构如框架、剪力墙、筒中筒等结构。 相似文献
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总结了整体现浇电缆工作井的工作特点和不足,分析采用预制装配式电缆工作井的优势,指出后者亟须解决的关键技术问题和可能的解决办法。针对现有预制电缆工作井专利技术的不足,建议采用混凝土空心板技术,并综述了现浇混凝土空心楼盖的研究与应用现状。通过SAP2000分析了实际电缆工作井的受力状况,用现有混凝土理论按空心井壁进行配筋设计,将其与现浇混凝土实心井壁进行技术经济对比分析后可知:在预制装配式电缆工作井中采用混凝土空心板技术是可行的,可取得节省材料、减轻自重和减少拼装接缝的效益,但空心板在压弯受力状态下的承载力计算理论尚需作进一步的研究。 相似文献
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Billen G Garnier J Némery J Sebilo M Sferratore A Barles S Benoit P Benoît M 《The Science of the total environment》2007,375(1-3):80-97
A model (the Riverstrahler model) is used to describe nutrient transfer and transformation at the scale of the whole drainage network of the Seine based on information concerning the basic mechanisms governing N, P and Si inputs to the drainage network and in-stream transformation and retention. It was used to calculate the budget of these nutrients through the whole river continuum from land to sea. With the help of historical documents, the constraints used as forcing function in this model were reconstructed to express the changing conditions of land-use and urban population over the last five hundred years. The corresponding scenarios were run for different hydrological regimes including dry, mean and wet conditions. The results were validated on the long-term series of nutrient measurements spanning more than a century available at some stations on the Seine, upstream and downstream of the city of Paris. The model was also used to explore past and future trends in nutrient loading, retention and delivery to the coastal zone, in response to human management of the terrestrial watershed. Beside the initial pristine state, used as an idealized reference state (with N, P and Si delivered fluxes of about 45-110 kg N km(-2) yr(-1), 2-5 kg P km(-2) yr(-1), 510-1325 kg Si km(-2) yr(-1)), four periods were distinguished. The first one is that of the traditional cottage economy which prevailed, with quite a constant total population, until the end of the 18th century. N, P and Si fluxes were about 235-750 kg N km(-2) yr(-1), 15-60 kg P km(-2) yr(-1) and 425-1280 kg Si km(-2) yr(-1), depending on hydrological conditions. The second period, from the beginning of the 19th century to about the 1950's, corresponded to rapid increase in the total and urban population with a corresponding increase of point sources of N and P. From 1950 onwards, modern farming practices resulted in a dramatic increase in diffuse sources of nitrogen and to a lesser extent phosphorus: riverine N and P export reached 1320-2800 kg N km(-2) yr(-1), and 310-340 kg P km(-2) yr(-1): silica export remained fairly constant at around 410-1260 kg Si km(-2) yr(-1) depending on the hydrological conditions. In the 1990's, the fourth period is represented by a stabilized population and improved wastewater treatment, when the export of phosphorus is reduced to values as low as 40-60 kg P km(-2) yr(-1), but without as effective a reduction of nitrogen export. This represents an unprecedented situation for the marine coastal system, i.e. a shift from nitrogen to phosphorus limitation, as nitrogen is still delivered far in excess of the amount of silica available for diatom blooms. 相似文献
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智能建筑在实现其智能化、舒适化目标基础上,其较大的运行能耗问题已引起社会的广泛关注,本文以空调设备系统运行控制为研究对象,对相应的空调系统节能运行控制模型和空调系统在线优化控制目标函数进行研究,提出空调设备系统运行控制节能策略,并进行相应的工程应用研究。 相似文献