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天津市建设管理委员会 《中国勘察设计》2004,(12):22-23
经过近几年的努力,天津建筑业整体水平取得了长足进步,已经成为天津经济发展的支柱产业。2003全市实现建筑业总产值510亿元,同比2002年增长25%;实现建筑业增加值120亿元,同比增长24%,占全国市场生产总值比重5.1%,第一次超过房地产贡献率。预计2004年实现建筑业总产值640亿元,建筑业增加值150亿元,为我市国民经济持续高速增长做出了积极的贡献。归纳我市加快建筑业改革与发展主要做法有五方面: 相似文献
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新疆维吾尔自治区建设厅 《中国勘察设计》2004,(12):72-73,76
改革开放以来,我区建筑业得到了较快发展,建筑业整体水平有所提高,生产能力得到增强。2003年,我区建筑业完成总产值354.5亿元,同比增长15.4%;完成建筑业增加值77.1亿元,同比增长5%,占自治区GDP的4.1%;房屋建筑施工面积3071万平方米,同比增长107.4%。建筑业在拉动经济增长的同时,带动了相关产业发展,形成了较长产业链, 相似文献
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上海市建设管理委员会 《中国勘察设计》2004,(12):24-25,31
近年来,上海的建设规模保持稳定增长,每年固定资产投资均保持在2000亿元,2003年全市固定资产投资额达245.11亿元,再创新高。本市建筑行业发展迅猛,主要经济技术指标稳步增长。2003年,全市建筑业总产值达到1529.56亿元,比上年增加435.68亿元,增长39.8%。建筑业增加值264.87亿元,比上年增加1.3%。 相似文献
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《中国勘察设计》2021,(8)
正本刊讯日前,中国建筑业协会发布《2021年上半年建筑业发展统计分析》。统计显示,上半年建筑业实现增加值33335.2亿元,同比增长8.6%,建筑业增加值占国内生产总值的比重为6.26%;江苏、浙江建筑业依然领跑全国各地,总产值双双超过1万亿元。2021年上半年,全国建筑业企业(指具有资质等级的总承包和专业承包建筑业企业,不含劳务分包建筑业企业,下同)完成建筑业总产值119843.55亿元,同比增长18.85%;完成竣工产值44334.74亿元,同比增长16.59%;签订合同总额443614.48亿元,同比增长13.49%;新签合同额144134.03亿元,同比增长14.40%;房屋施工面积119.31亿平方米,同比增长6.47%;房屋竣工面积14.10亿平方米,同比增长13.23%。 相似文献
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行业市场逐渐走向存量时代
建筑业是我国国民经济的支柱产业.2020年,我国建筑业实现总产值26.4万亿元."十三五"期间,建筑业总产值年均增长7.8%.相对于"十二五"期间建筑业总产值13.5%的年均增速,"十三五"期间建筑业增长放缓. 相似文献
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2003年,我省完成全社会固定资产投资1180亿元,全省建筑业完成增加值260亿元,比2002年增长11%,占全省GDP的10.8%。建筑业从业人员达到110余万人,约占全社会从业人员的5.9%,吸纳农村富余劳动力达82万人,建筑业已成为我省的支柱产业之一。 相似文献
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鉴于大陆岩浆弧上盘广泛分布有碳酸盐岩,岩体上升侵位过程使其碳通量明显的高于洋内岛弧,从而有可能影响着地质历史长时间尺度(百万年)的气候变化。陆弧碳的排放可分为两部分,一部分是与喷出岩相关的火山作用,另一部分是与侵入岩相关的脱碳过程。侵入岩的体量一般是喷出岩体量的10倍以上,由此与侵入岩有关的脱碳作用释放的碳通量不可忽视,可能类似与喷出岩有关的火山作用释放的碳通量甚至更大。火山作用能够将气体直接排入大气中,因此在以往的工作中研究较为充分。但与侵入岩相关的脱碳过程如:矽卡岩化,发生在地下,关于地下脱碳过程如何将碳释放到大气中还缺少详细的工作。本文,通过对比研究火山地区和非火山地区与侵入岩相关的深部脱碳过程,发现深部碳可以通过区域断层系统、地下水系统和热泉、火山通道、隐爆角砾岩筒、高频率的岩浆热液事件等途径瞬时地释放进入大气。通过初步估算,发现单个矽卡岩矿化事件所产生的二氧化碳通量(0.02~0.2Mt/yr)能够与目前地球绝大部分的普通单个火山的碳通量(<0.5Mt/yr)类比。因此岩浆深部脱碳过程对大气的影响至少与火山相当,其对气候的影响不可忽视。 相似文献
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Mathematical Geosciences - 相似文献
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本文从人生信念、道德境界以及我国传统美德等方面阐述了敬业精神对当今激烈的市场竞争中的重要作用,并推出大力倡导敬业精神,纠正行业不正之风的基本途径和方法。 相似文献
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An extension to the DRASTIC model is proposed in order to assess aquifer vulnerability to pollution. In contrast to the DRASTIC
model, which considers the unsaturated and saturated zones together and computes a global intrinsic vulnerability index, the
suggested approach discriminates between the aquifer vertical vulnerability (a concept related to the pollutant percolation)
and the groundwater susceptibility (a concept that depends on the behaviour and uses of the groundwater). This approach is
applied to the Haouz aquifer (Morocco) that supplies water to the Marrakech area. This aquifer is widely overexploited and
there is evidence that the groundwater quality is threatened by various sources of pollution. Evaluation of the vertical vulnerability
indicates that the aquifer mainly presents a moderate-to-weak vertical vulnerability. The zones potentially most favourable
to pollutant percolation are mainly located in Central Haouz, along or near the surface wadis. The aquifer susceptibility
is high in places located near the N’Fis, Baaja and Issil wadis. Everywhere else, low-to-moderate susceptibility is observed.
This new approach therefore enables areas of vertical vulnerability and areas of susceptibility to be delineated separately.
As a result, it constitutes a valuable decision-making tool for optimising the management of aquifer water resources and land-use
planning. 相似文献
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水平定向钻进地层适应性的评价方法 总被引:1,自引:0,他引:1
水平定向钻进的地层适应性对施工技术方案、钻具选择、参数选取和施工效益都有着重要影响。应采用钻进地层的岩土硬度、完整性和研磨性三方面指标,对比钻进技术工艺和技术器具特点,对钻进效率、钻孔的成孔和孔壁稳定性、以及钻具寿命等进行定性及定量的评价,从而有利于大大提高水平定向钻进铺管施工的技术和经济效益。 相似文献
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Nutrient loading to estuaries with heavily populated watersheds can have profound ecological consequences. In evaluating policy
options for managing nitrogen (N), it is helpful to understand current and historic spatial loading patterns to the system.
We modeled N inputs to Narragansett Bay from 1850 to 2000, using data on population, human waste disposal, livestock, fertilizer,
and atmospheric deposition. We found that total N loading to the bay increased 250% from 1850 to 2000, and 80% from 1900 to
2000. Loading to the upper bay increased far more than that to the lower bay, and the most important source shifted from non-point
animal waste to human waste concentrated at sewage treatment facilities. We also modeled future N loads in 2015 under four
management scenarios. Planned improvements in sewage treatment would reduce N loads 9% below business-as-usual, to the 1990
loading rate. Greater reductions, to circa 1900 rates of loading, may be possible. 相似文献
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Nowadays, environmental problems related to soil pollution with heavy metals are numerous, therefore, it is important to understand metals behaviour in aquatic sediments and soils and to estimate their transfer. The fate of metals in the environment is closely related to their interactions with the major reactive compartments (organic matter, iron and manganese oxides, clays). The objective of this work is to develop an approach based on the combination of several models to study metal ion speciation in different environmental systems. Models used to describe the interactions of metals with the main reactive phases in the soil are CD-MUSIC (amorphous and crystallized iron oxides), NICA-Donnan (organic matter and manganese oxides) and cationic ion exchange model (clays). First, this work implies the definition of generic parameters to describe the interactions of the studied metals with iron and manganese oxides and part of this information is missing in the literature. Then, after a validation of the approach by comparison with analytical results, this multi-surface model is applied to test sites corresponding to one soil and two riverine environments.These new models give good predictions of the behaviour of major and trace metal ions even in heterogeneous systems characteristic of natural environment. The measured free metal concentrations in the solution are in agreement with those obtained from model calculations. In the case of the soil test site, the soil solution composition and speciation are predicted using the soil major constituents characteristics. 相似文献
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Der Sarkissian Rita Abdallah Chadi Zaninetti Jean-Marc Najem Sara 《Natural Hazards》2020,103(1):121-137
Natural Hazards - Estimating the resilience of a road network (one of the essential critical infrastructures in times of crisis) to natural hazards is crucial in achieving the goals of disaster... 相似文献