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61.
Shahrestani Shahed Mokhtari Ahmad Reza Alipour-Asll Masood 《Natural Resources Research》2019,28(3):1071-1087
Natural Resources Research - The weighted mean and the multiple regression techniques are two methods that are employed to estimate elemental background concentration of lithologies upstream of... 相似文献
62.
Habib Kazi Ahsan Neogi Amit Kumer Oh Jina Lee Youn-Ho Kim Choong-Gon 《Ocean Science Journal》2019,54(1):79-86
Ocean Science Journal - The new puffer fish species Chelonodontops bengalensis (Pisces: Tetraodontidae) is described from two specimens collected on the southwest coast of the Bay of Bengal,... 相似文献
63.
64.
An Estimation of Rock Strength Using a Drilling Performance Model: A Case Study in Blacktip Field,Australia 总被引:1,自引:0,他引:1
This paper presents the results of a case study performed in Well BT-1 in the Blacktip field; an offshore field located in
northern Australia. An analytical model based on mud logging data was used to estimate a formation’s strength in Well BT-1.
The drilled well is vertical and the input data to the model included the rate of penetration, rotary speed, weight on bit
and torque values of the bit obtained from mud logging data. The final model was completed in several steps: estimation of
the bit constants from either lab or field data, backward calculation of rock strength using a drilling performance model,
smoothing of the estimated log to obtain the apparent rock strength log and classifying the formations into zones with similar
strength values. The results of a log-based approach carried out in Well BT-1 were used to do the modelling. The results presented
here indicate that the drilling performance model is able to predict the formation strength reasonably well. Based on the
results, care should be taken when the model is used for the intervals where the bit is worn and dull, since within these
intervals the model tends to over-estimate the rock strength. 相似文献
65.
Priyanka Tripathi G. Parthasarathy S. Masood Ahmad O. P. Pandey 《International Journal of Earth Sciences》2012,101(5):1385-1395
We report here for the first time geochemical, mineralogical and stable carbon and oxygen isotopic data on the crystalline basement rocks of the 1993 Killari earthquake region of Maharashtra (India), which is covered by a thick suite of Deccan volcanics. Our results revealed the hitherto unknown amphibolite–granulite nature of the 2.5?Ga basement, which contains 2.00–2.28?wt% of CO2. The stable carbon (δ13C) and oxygen (δ18O) isotopic measurements on carbonates separated from two basement samples KIL-13 (440.5?m depth) and KIL-20 (499.6?m depth) collected from the KLR-1 borehole drilled in the epicentral region showed the respective values of ?6.23 and ?6.22‰ versus PDB for δ13C and 7.94 and 8.11‰ versus SMOW for δ18O. The samples plot in the primary igneous carbonatite field, indicating the mantle origin of the carbonates, derived through the process of mantle metasomatism from the deep mantle carbon reservoir. This would suggest large-scale crust-mantle thermal fluid interaction beneath the Killari seismogenic region, which is characterized by massive upwarping of the high-velocity mafic crust and retrograde metamorphism. 相似文献
66.
Geotectonics - The collision of the Eurasian and Indian plates has resulted in two spatially offset subduction zones, the Makran subduction zone to the south and the Himalayan convergent margin to... 相似文献
67.
Miraj M. A. F. Shahzad S. Munawar M. J. Ahsan N. Saleem R. F. Afgan S. 《Geotectonics》2021,55(6):874-887
Geotectonics - The subsurface structure analysis of the Southern North Sea through the interpretation of 2D seismic data set (SNSTI-NL-87 and SNST-NL-83) is carried out. The subsurface structural... 相似文献
68.
Masood Ahsan Siddiqui Syed Mohammad Rashid Lubna Siddiqui Shahzad Ali Ansari 《Journal of the Indian Society of Remote Sensing》2012,40(1):109-119
The paper tries to estimate the rate of waste generation per head/per day, to identify suitable sites for waste disposal,
to find out optimal route for collection vehicles and to analyze the financial aspects of solid waste management in Moradabad
City, India.The study is based on sample of 2,500 households and secondary data. The City generates about 318 tones of solid
waste with an average per capita rate of 460 gram per day. Collection and disposal efficiency is nearly 64%. Sensitivity analysis
of the present disposal site as per the norms of Central Pollution Control Board indicates that it is moderately suitable.
Subsequently two new disposal sites were identified. Redefined routes and related issues were evaluated in financial terms.
It is estimated that by adopting the proposed plan, the expenditure on waste management will increase by about 52%, but at
the same time about 90% of city area and 95% of city population will be served. 相似文献
69.
Relative Sea Level Changes in Maldives and Vulnerability of Land Due to Abnormal Coastal Inundation 总被引:1,自引:0,他引:1
Tariq Masood Ali Khan Dewan Abdul Quadir T. S. Murty Anwarul Kabir Fahmida Aktar Majajul Alam Sarker 《Marine Geodesy》2013,36(1-2):133-143
Oceanic Islands in the Pacific and Indian Oceans have extremely small land areas, usually less than 500 km2, with maximum height about 4 m above sea level. The Republic of Maldives is an independent island nation in the Indian Ocean south of Sri Lanka which stretches vertically in the Indian Ocean from 07° 06'N - 0° 42'S. The land area of this island country is about 300 km2, and none of Maldives' 1190 islands has an elevation more than 3 m above sea level. In fact the Maldives has the distinction of being the flattest country on earth, making it extremely vulnerable to the effects of global warming. Of the south Asian countries, the Maldives is the most vulnerable nation, facing severe consequences as a result of global warming and sea level rise (SLR). Because of their obvious vulnerability to SLR, the Government of Maldives is very much concerned about climate change. As global warming and the related SLR is an important integrated environmental issue, the need of the hour is to monitor and assess these changes. The present article deals mainly with the analysis of the tidal and Sea Surface Temperature (SST) data observed at Male and Gan stations along the Maldives coast in the northern and southern hemispheres, respectively. The objective of the analysis is to study the trends of these parameters. Trend analysis is also performed on the corresponding air temperature data of both stations. The results show that Maldives coastal sea level is rising in the same way (rising trend) as the global sea level. The mean tidal level at Male has shown an increasing trend of about 4.1 mm/year.Similarly at Gan, near the equator,it has registered a positive trend of about 3.9 mm/year.Sea level variations are the manifestations of various changes that are taking place in the Ocean-Atmosphere system. Therefore, the variations in SST and air temperature are intimately linked to sea level rise. It is found that SST and air temperature have also registered an increasing trend at both stations. The evidence of rising trends suggest that careful future monitoring of these parameters is very much required. Tropical cyclones normally do not affect the Maldives coast. However, due to its isolated location, the long fetches in association with swells generated by storms, that originated in the far south have resulted in flooding. Thus the rising rate of sea level with high waves and flat topography have increased the risk of flooding and increased the rate of erosion and alteration of beaches. 相似文献
70.
A simple and reliable method for predicting the relationship between lateral displacement and earth pressure for rigidly framed earth retaining structures (RFERS) was developed. Closed‐form equations were derived such that if one value of displacement or pressure is known (or assumed) the other can be computed for hydrostatic, seismic, uniform, and semi‐elliptical earth pressure distributions. Additionally, the general form of the equations can be used to predict the magnitude of the lateral force even if the shape of the earth pressure is unknown, with a reasonable degree of accuracy. The expressions for deflection were derived by treating the structure as an equivalent cantilever beam and calibrating the resulting expression using the finite element method (FEM). A parametric FEM analysis, of 42 000 different RFERS configurations, was performed to calibrate the expressions, using multivariate non‐linear regression between the derived expressions and FEM. A Weibull statistical analysis was performed for each equation and determined that the equations had better than 80% probability to yield deflections that are within 25% of the value computed using FEM. Furthermore, there is a 98% certainty that each equation will yield a deflection that is within 50% of that computed using FEM. Copyright © 2011 John Wiley & Sons, Ltd. 相似文献