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81.
A new method is proposed to interpret magnetic anomalies due to a thin dike, a sphere, and a fault like structure, where depth, horizontal location, effective magnetization intensity and effective magnetization inclination of a buried structure are simultaneously obtained. The proposed method is based on Fair function minimization and also on stochastic optimization modeling. This new technique was firstly tested on a theoretical synthetic data randomly generated by a chosen statistical distribution from a known model with different random noises components. This mathematical simulation shows a very close agreement between the assumed and the estimated parameters. The applicability and validity of this method are thereafter applied to magnetic anomaly data taken from United States, Australia, India, and Brazil. The agreement between the results obtained by the new method and those obtained by other interpretative methods is good and comparable. Moreover, the depth obtained by such a method is found to be in high accordance with that obtained from drilling information. 相似文献
82.
This contribution is an attempt to enlarge the current knowledge about the focal mechanisms as well as the seismotectonic
settings in Syria. The seismologically active zones have been identified by applying an appropriate methodology to the events
recorded during the period 1995–2003 by the Syrian National Seismological Network (SNSN). The recorded events in Syria were
classified as weak during the research period. It was extremely important to propose and apply an appropriate methodology
to identify the focal mechanisms generating this seismic activity. The proposed methodology consists of applying a combination
of two techniques: the multiplet and the composite focal mechanisms. The combination of many events in one composite focal
mechanism was realized by a multiplet technique using the spectral coherence of the events as a measure of similarity. The
application of the proposed methodology allows a data set of composite fault plane solutions to be obtained. Most of the composite
fault plane solutions had strike-slip mechanisms which are in agreement with the configuration of seismogenic belts in Syria. 相似文献
83.
Jamal Asfahani 《Acta Geophysica》2011,59(1):139-154
Electrical resistivity survey is conducted in the Khanasser Valley, considered as a semi-arid region in Northern Syria, to
guide and control fresh water well drilling. Vertical Electrical Soundings (VES) are carried out near the existing wells,
which were also used to measure salinity and conductivity of water samplings. Resistivity and hydrogeological data combination
made it possible to establish empirical relationships between earth resistivity, water resistivity, and the amount of total
dissolved solids (TDS). These relationships are used in the present research in order to follow the TDS salinity variations,
both in lateral and depth directions, along the longitudinal profile LP3, located in Khanasser Valley. Apparent salinity map
under this profile is established for Quaternary and Paleogene deposits, and boundaries of suitable areas for fresh water
well drilling in the totality of the Khanasser Valley are drawn. It was shown that excessive fresh-water depletion may affect
the groundwater quality by upward seepage of saline water. Therefore, it is important to keep the fresh-salt water interface
in a stationary situation. The geoelectrical methods widely contribute in determining the position of such interface, and
can be easily applied in similar arid areas. 相似文献
84.
85.
In recent years, the United Arab Emirates (UAE) has experienced an unprecedented growth which is coupled with the increase in seismic activity in the surroundings. Previous studies presents significant variations in their results whereas some recent studies although very detailed focus on only few cities. This study reviews the results of previous studies and presents new findings for the whole of UAE based on the improved source model and use of next generation attenuation (NGA) equations. The peak ground accelerations, spectral accelerations and deaggregation of hazard for major cities are presented. Moreover, the breakdown of the range of mapped spectral accelerations (S 0.2 and S 1) is proposed to form the basis for the development of site amplification factors in subsequent studies. The results of this study indicate almost similar values of ground motion compared to some recently published studies and smaller values compared to some earlier studies. 相似文献
86.
Alhani Israa Jamal Noor Mohd Jamaludin bin Md Al-Bared Mohammed Ali Mohammed Harahap Indra Sati Hamonangan Albadri Wael Mahmood 《Acta Geotechnica》2020,15(11):3075-3093
Acta Geotechnica - During the construction of pavements, gravelly soil is used as the main material in the base and sub-base layers. Predicting the deformation behaviour of gravelly soil has been... 相似文献
87.
88.
Masoud SHARIFI-YAZDI Amirhossein ENAYATI Jamal SALEHI AGHDAM Mohammad BAHREHVAR Seyed Mustafa REZAEI 《《地质学报》英文版》2024,98(1):185-206
The Qom Formation is the most important hydrocarbon reservoir target in Central Iran. The Qom platform developed in a back-arc basin during the Oligo–Miocene due to the closing of the Tethyan Seaway. This formation consists of a variety of carbonate and non-carbonate facies deposited on a platform ranging from supratidal to basin. A combination of tectonic and eustatic events led to some lateral and vertical facies variations in the study area. Six third-order depositional sequences and related surfaces were identified regarding vertical facies changes in the studied sections of this Oligo–Miocene succession. According to all results and data, this succession was initially deposited during the Chattian upon a distally steepened ramp of siliciclastic-carbonate composition, including the Bouma sequence. Then, from the late Chattian to the Aquitanian, the platform changed into a homoclinal carbonate ramp with a gentle profile. With respect to tectonic activity, this phase was a calm period during the deposition of the Qom Formation. Finally, a drowned carbonate platform and a rimmed shelf emerged during the Burdigalian, terminated by the continental deposits of the Upper Red Formation. Regarding all geological characteristics, three main tectono-eustatic evolutionary phases have been recognized in the Qom back-arc basin. 相似文献
89.
90.
An instrumental earthquake catalog covering the time span between 1903 and 2007 and for the area bounded by 32°N–38°N and 35°E–43°E has been compiled in this research. The catalog has a magnitude of completeness (M c ) with 3.5. Least squares and statistical probability Gumbel’s techniques with different approaches have been applied on the instrumental events in order to assess the average recurrence time periods for different earthquake magnitudes. The constants a and b of Gutenberg-Richter and the average recurrence times have been computed firstly for the study area and secondly for the central and northern parts of Dead Sea fault system. The different statistical computations using Knopoff and Kagan formalism are generally in agreement and suggest an average recurrence time of 203 years for an earthquake of magnitude 7 for the region. The occurrence of large well-documented historical earthquakes in Lebanon and western Syria, the existence of active fault segments, the absence of large earthquakes during the study period, the increasing number of the low-magnitude earthquakes, and the continued accumulation of the strain since 1900 indicate therefore the probability of an earthquake occurrence of a large magnitude. This should be permanently taken into consideration in seismic hazard assessment on the local and regional scales. 相似文献