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81.
Dwayne D. Tannant 《Georisk: Assessment and Management of Risk for Engineered Systems and Geohazards》2015,9(3):148-157
The Testalinden earth dam in southern British Columbia failed in June 2010 and created a huge debris flow. Homes were destroyed and property was damaged. The failure of this small dam resulted in a comprehensive review of over 1000 dams in the province, evaluation of dam safety management practices, changes to the Water Act and improvements in how data on dams are collected, archived and communicated. The provincial dam inventory was re-evaluated to ensure that appropriate consequence classification, and therefore attention, is assigned to dams. Increased scrutiny was placed on dam owners to ensure they complied with dam safety policies and to ensure they submitted annual inspection reports and formal dam safety reviews in a timely manner. Dam owners and professionals engaged in dam safety activities have received new guidelines and better education and training. 相似文献
82.
新版IAEA安全导则《核电厂地震危险性评价》的分析与评述 总被引:4,自引:4,他引:0
本文分析了国际原子能机构新颁布的安全导则“EvaluationofSeismicHazardsforNuclearPowerPlants(NS-G-3.3)”与前版导则相比在内容、方法上的一些显著的变化;同时,结合我国核电厂厂址地震安全性评价的方法和实践,对该新版导则在我国的引进和应用中应该注意的问题,进行了评述。 相似文献
83.
Thanh Son Nguyen Lennart Börgesson Masakazu Chijimatsu Jan Hernelind Lanru Jing Akira Kobayashi Jonny Rutqvist 《Environmental Geology》2009,57(6):1239-1254
In order to demonstrate the feasibility of geological disposal of spent CANDU fuel in Canada, a safety assessment was performed
for a hypothetical repository in the Canadian Shield. The assessment shows that the maximum long term radionuclide release
from such repository would meet international criteria for dose rate; however, uncertainties in the assumed evolution of the
repository were identified. Such uncertainties could be resolved by the consideration of coupled Thermal-Hydro-Mechanical-Chemical
(THMC) processes. In Task A of the DECOVALEX-THMC project, THM models were developed within the framework of the theory of
poroelasticity. Such model development was performed in an iterative manner, using experimental data from laboratory and field
tests. The models were used to perform near-field simulations of the evolution of the repository in order to address the above-mentioned
uncertainties. This paper presents the definition and rationale of task A and the results of the simulations. From a repository
safety point of view, the simulations predict that the maximum temperature would be well below the design target of 100°C;
however, the stress on the container can marginally exceed the design value of 15 MPa. However, the most important finding
from the simulations is that a rock damage zone could form around the emplacement borehole. Such damage zone can extend a
few metres from the walls of the emplacement holes, with permeability values that are orders of magnitude higher than the
initial values. The damage zone has the potential to increase the radionuclide transport flux from the geosphere; the effect
of such an increase should be taken into account in the safety assessment and mitigated if necessary by the provision of sealing
systems.
Prepared for publication in Environmental Geology.
DECOVALEX-THMC Special Issue. 相似文献
84.
叶片桨距角之间的角度差异产生的空气动力失衡是海上风机的主要动力问题之一。基于海上风机分析程序FAST和水动力计算程序WADAM开发的一种时域数值模拟程序,可计算海上风机系统在风浪载荷作用下的耦合动力响应。应用此数值工具,模拟一个叶片上变桨控制系统失效的情况,研究空气动力失衡对浮式海上风机系统运动响应的影响。分析表明,空气动力载荷失衡引起的激振不仅激发了浮式基础的横向运动,而且增大了基础的纵荡运动和首摇运动。同时,空气动力失衡还大幅增加了风机塔柱底部受到的横向剪切力,对风机系统的安全性造成了威胁。 相似文献
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The article presents a statistical approach to characterize and predict engineering geological conditions in the up to 2000 m deep Faido tunnel and Gotthard base tunnel in Switzerland. Seismic investigations were conducted to improve the technology of interpreting seismic tomographic images. Overall, the goal of this study was to predict spacial maps of geological rock mass properties, such as, uniaxial compressive strength or total fracture spacing, by using up to six seismic features in combination, e.g., compression-wave and shear-wave velocities and dynamic Poisson's ratio. Self-Organizing Mapping (SOM), an artificial intelligent method, was used for the purposes of interpreting multi-dimensional geophysical attributes derived from seismic profiles of tomographic images along tunnel sidewalls. The SOM-method was applied in the Faido tunnel to delineate complex physical relations between the geological and seismic parameters. Then, the method was applied to predict geological properties around a segment of the Gotthard base tunnel with unknown geological–geotechnical conditions. The results illuminate that correlation analyses (pairwise parameter classification) are substantially less powerful than the SOM-method (multi-parameter classification) in order to interpret geological features from seismic in-situ data. Moreover, predicted spatial distributions of the total fracture spacing and the uniaxial compressive strength, for example, corresponded well with drill core and tunnel mapping results. The SOM-approach was a helpful tool for practitioners in predicting zones of instabilities and geological complexity during underground excavation processes of the Gotthard base tunnel. It is suggested to use such an interpretation method as decision support for purposes of sub/surface exploration and long-term geophysical monitoring of large-scale geoengineering projects, such as, disposals of nuclear waste and greenhouse gases or geopower plants for renewable energy (geothermal, biosoils). 相似文献
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Because it can be carried by flowing water, a sand/gravel pit on the river bed could migrate downstream. Consequently, the presence of pits on river beds could pose a safety threat to in-stream hydraulic structures such as bridge piers. A pit migration model can be used to predict progressive changes of pit geometry as it migrates downstream. However, due to the existence of many uncertainties, the maximum pit depth cannot be predicted with certainty. This paper adopted a simple pit migration model and evaluated the uncertainty associated with the calculated maximum pit depth. Such information is essential for evaluating the probability that a migrating pit could pose a safety threat to a downstream hydraulic structure. Three reliability analysis techniques were applied and their performances were compared. 相似文献