共查询到20条相似文献，搜索用时 125 毫秒
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综合性设计院如何有效应对入世后的挑战与机遇？如何积极响应江泽民总书记的“走出去”战略。该文介绍了机械工业第二设计研究院在深化改革，联合重组，创建国际型工程公司，全面提高核心竞争力等方面所做的大胆探索，可为兄弟单位思路创新提供借鉴。 相似文献
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随着WTO过渡期的结束，国家将允许境外设计公司参与竞争，同时国内设计单位改制所激发的活力及国家在政策上鼓励成立专业设计事务所，设计行业的竞争将越来越激烈，设计单位的专业化分工也越来越细，设计单位之间的竞争说到底是人力资源的竞争，由于设计行业的特殊性， 相似文献
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近年来，在面临多变、快变、巨变的行业联合重组、深化改革的严峻形势下，中联西北院要实现“做精做优，做强做大”，自身就必须要有一种积极健康、开拓奋进、持之以恒的推动力，这股推动力强劲与否，从很大程度上讲不是依赖于制度和技术，而是依靠企业文化，依靠我们每一位中联西北院人的思想和行动。[第一段] 相似文献
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近几年，二六五大队在鹰潭市开展创建省级卫生城市活动中，根据鹰潭市创建思路，把创建工作列入重要议事日程，切实加强环境建设和公共卫生管理工作，加强爱国卫生和“创卫”的宣传教育，组织和动员广大职工家属积极投入创建卫生社区活动，取得了良好的成效，多次受到月湖区通报表扬。 相似文献
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谈勘察设计行业的PDM应用与实施 总被引：1，自引：0，他引：1
介绍PDM在勘察设计行业的应用。工程建设全过程中，设计是先行的而且是贯穿全过程的关键环节。PDM充分利用先进的信息管理技术，把勘察设计过程产生的图纸以及其他设计文件作为产品来管理，旨在强化设计过程控制，提高工程设计水平与质量。 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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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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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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Marc F. Benedetti 《中国地球化学学报》2006,25(B08):269-269
Nowadays, environmental problems related to soil pollution with heavy metals are numerous, therefore, it is important to understand metal behavior in aquatic sediments and soils and to appreciate their transfer. The fate of the 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）. Firstly, this work implies the definition of generic parameters to describe the interactions of the studied metals with iron and manganese oxides, a part of this information is missing in the literature. Then, after the validation of the approach by comparison with analytical results, this multi-surface model is applied to test sites corresponding to a soil and to two riverine environments. These new models give good predictions of the behavior of major and trace metal ions even in heterogeneous system characteristics of the natural environment. The measured free metal concentrations in the solution are in agreement with those obtained from model calculations. 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