共查询到20条相似文献，搜索用时 156 毫秒
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高层建筑深层平板载荷试验的研究 总被引：2，自引：1，他引：2
介绍了高层建筑深层平板载荷试验方法的技术现状及一套测试深度可达百米，测试精度高且不受深度影响的新型深层平板载荷试验装置，提出了深层载荷试验中存在的关键性技术问题及解决措施，并给出了实测试验成果。 相似文献
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水电工程中的地应力测定工作,能及时了解地下深部岩体中的地应力变化情况,这对于大型水坝工程设计与后期稳定都有着直接的关系.通过钻孔进行地应力测试的技术,在国内已经成功地被运用于矿山与水电等工程上,但如何在几百米深度、孔内有水的情况下进行地应力测试,仍是一个技术难题.1984年,我队配合长江水利水电科学院,借助于从瑞典国家电力局引进的地应力测试装置与配套金刚石钻头,在长江三峡船闸区300号钻孔里,首次成功地进行了304.72米深 相似文献
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近年来,在陆上进行热流测试或钻孔地温测量过程中,人们发现一些地区近地表数十米以至上百米的地温曲线发生某些“扭曲”或“畸变”现象,在排除了可能造成这些现象的各种因素诸如岩性变化、地形、植被以及地下水活动影响之后,地温曲线依然与稳态地温 相似文献
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基于不同类型金矿床的能谱测据与金品位之间有不同的相关关系,对具体矿床单独建模预测是必要和可能的。能谱找金测据处理系统的设计就是根据测据处理的数学方法和步骤编制的。常用的多元线性回归分析预测效果往往不理想,而本系统对能谱测据作适当变换并计算权值、差值和有利度等预处理后,回归准确性显著提高。它同时可建立十多个数学模型,使用户有较大的选择余地。它采用树状程序结构,全中文菜单式提示,可逐级调用,也可单独运行各级子系统。它可移植于其它类似的地质矿床模型的测据(包括非能谱测据)处理。该系统快速、准确、简便、灵活,具有较大的实用性和推广价值。 相似文献
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Certain cultural information is expressed in the morphology of projectile points. the present paper presents a technique that can extract a large amount of information in the shape of these points. Using a concept from fractal geometry, the degree of shape irregularity is quantified. This technique can be used to document variability in shape of individual points within a point type, or among point types. In this paper, the shapes are segmented into two components (structural and textural), and points of similar characteristics plot closely in bivariate plots of these components. If necessary, the method can be modified to provide information at more than two scales. 相似文献
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The Use of Reference Materials: A Tutorial 总被引：2，自引：1，他引：2
Jean S. Kane 《Geostandards and Geoanalytical Research》2001,25(1):7-22
Any review of the analytical literature shows that, while reference materials are routinely used in laboratories world-wide, not all uses follow ISO Guide 33 (1989), which outlines best practices. Analytical data quality can suffer as a result. This paper reviews the various uses that the geoanalytical community has made of reference materials from a historical perspective, and suggests improvements in practice that would more closely follow ISO Guide 33 recommendations. 相似文献
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Pierre Gy 《International Journal of Mineral Processing》1981,8(3):279-286
This paper shortly describes a method making it possible to obtain, as the result of a single sampling operation, a “proportional sample” thanks to which the tonnage of material sampled can be accurately determined, as well as its grade.The tonnage estimation is reported to be more accurate and more reliable than the estimation obtained by means of conventional methods such as belt-scales (solids), flow- and density-meters (pulps), which makes the method very attractive. It was successfully tested at pilot scale and is being implemented in a full-scale flotation plant.By generalizing this sampling method to the various materials fed to or produced by a metallurgical plant (e.g. a flotation plant) a very accurate metallurgical balance can be established. Industrial results will be published as soon as available. 相似文献
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A modification of Burger's phi-normal approximation for the moments of grain-size data 总被引：1，自引：0，他引：1
YVES BEAUDOIN 《Sedimentology》1980,27(4):455-459
This paper gives a modification of Burger's method of approximation for the moments of grain-size data. It is shown that formal integration can be carried out in conjunction with Burger's phi-normal interpolation scheme. This approach obviates Burger's recourse to a discrete numerical integration procedure because exact integration yields a computationally more efficient approximation formula for the moments. 相似文献
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微生物参与下的水/粒界面吸附反应研究进展 总被引：3，自引：0，他引：3
回顾了近年来微生物存在下的水/粒界面吸附反应研究进展，包括微生物对金属阳离子的吸附、矿物微粒对微生物的吸附和微生物参与下的水/粒界面吸附；目前，这些吸附反应的定量化模型研究主要有体积分配关系和表面络合模型两种方法。其中，体积分配关系可从野外直接测得；而表面络合模型是采用不受溶液条件变化影响的准热力学常数来描述表面化学反应，能外推至实验室无法直接模拟的条件。随着人们对微生物在环境中重要性认识的加深，微生物参与下的水/粒界面吸附和可预测吸附程度的定量化模型受到人们越来越多的重视。 相似文献
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四川某金矿是一种难浸金矿，因为矿石中的金被包裹于含铁硫化矿物中，而且含有机炭质物。细菌Hst能有效氧化金矿中的硫化矿物以提高金的浸出率。如果细菌氧化矿石中铁的浸出率大于90％，金几乎完全解离，金的氰化浸出率大于90％。研究表明，该金矿的难浸特性是因为金包裹于含铁硫化矿物中，有机炭质物和粘土矿物对金浸出影响甚微。 相似文献
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Climate change is identified as a major threat to wetlands. Altered hydrology and rising temperature can change the biogeochemistry and function of a wetland to the degree that some important services might be turned into disservices. This means that they will, for example, no longer provide a water purification service and adversely they may start to decompose and release nutrients to the surface water. Moreover, a higher rate of decomposition than primary production (photosynthesis) may lead to a shift of their function from being a sink of carbon to a source. This review paper assesses the potential response of natural wetlands (peatlands) and constructed wetlands to climate change in terms of gas emission and nutrients release. In addition, the impact of key climatic factors such as temperature and water availability on wetlands has been reviewed. The authors identified the methodological gaps and weaknesses in the literature and then introduced a new framework for conducting a comprehensive mesocosm experiment to address the existing gaps in literature to support future climate change research on wetland ecosystems. In the future, higher temperatures resulting in drought might shift the role of both constructed wetland and peatland from a sink to a source of carbon. However, higher temperatures accompanied by more precipitation can promote photosynthesis to a degree that might exceed the respiration and maintain the carbon sink role of the wetland. There might be a critical water level at which the wetland can preserve most of its services. In order to find that level, a study of the key factors of climate change and their interactions using an appropriate experimental method is necessary. Some contradictory results of past experiments can be associated with different methodologies, designs, time periods, climates, and natural variability. Hence a long-term simulation of climate change for wetlands according to the proposed framework is recommended. This framework provides relatively more accurate and realistic simulations, valid comparative results, comprehensive understanding and supports coordination between researchers. This can help to find a sustainable management strategy for wetlands to be resilient to climate change. 相似文献
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Climate change is identified as a major threat to wetlands. Altered hydrology and rising temperature can change the biogeochemistry and function of a wetland to the degree that some important services might be turned into disservices. This means that they will, for example, no longer provide a water purification service and adversely they may start to decompose and release nutrients to the surface water. Moreover, a higher rate of decomposition than primary production (photosynthesis) may lead to a shift of their function from being a sink of carbon to a source. This review paper assesses the potential response of natural wetlands (peatlands) and constructed wetlands to climate change in terms of gas emission and nutrients release. In addition, the impact of key climatic factors such as temperature and water availability on wetlands has been reviewed. The authors identified the methodological gaps and weaknesses in the literature and then introduced a new framework for conducting a comprehensive mesocosm experiment to address the existing gaps in literature to support future climate change research on wetland ecosystems. In the future, higher temperatures resulting in drought might shift the role of both constructed wetland and peatland from a sink to a source of carbon. However, higher temperatures accompanied by more precipitation can promote photosynthesis to a degree that might exceed the respiration and maintain the carbon sink role of the wetland. There might be a critical water level at which the wetland can preserve most of its services. In order to find that level, a study of the key factors of climate change and their interactions using an appropriate experimental method is necessary. Some contradictory results of past experiments can be associated with different methodologies, designs, time periods, climates, and natural variability. Hence a long-term simulation of climate change for wetlands according to the proposed framework is recommended. This framework provides relatively more accurate and realistic simulations, valid comparative results, comprehensive understanding and supports coordination between researchers. This can help to find a sustainable management strategy for wetlands to be resilient to climate change. 相似文献