全文获取类型
收费全文 | 3356篇 |
免费 | 390篇 |
国内免费 | 404篇 |
专业分类
测绘学 | 115篇 |
大气科学 | 494篇 |
地球物理 | 1261篇 |
地质学 | 1236篇 |
海洋学 | 525篇 |
天文学 | 42篇 |
综合类 | 119篇 |
自然地理 | 358篇 |
出版年
2024年 | 17篇 |
2023年 | 27篇 |
2022年 | 45篇 |
2021年 | 77篇 |
2020年 | 88篇 |
2019年 | 100篇 |
2018年 | 57篇 |
2017年 | 127篇 |
2016年 | 137篇 |
2015年 | 159篇 |
2014年 | 211篇 |
2013年 | 167篇 |
2012年 | 147篇 |
2011年 | 221篇 |
2010年 | 153篇 |
2009年 | 233篇 |
2008年 | 292篇 |
2007年 | 239篇 |
2006年 | 218篇 |
2005年 | 184篇 |
2004年 | 147篇 |
2003年 | 128篇 |
2002年 | 126篇 |
2001年 | 97篇 |
2000年 | 126篇 |
1999年 | 94篇 |
1998年 | 103篇 |
1997年 | 72篇 |
1996年 | 69篇 |
1995年 | 51篇 |
1994年 | 46篇 |
1993年 | 35篇 |
1992年 | 31篇 |
1991年 | 24篇 |
1990年 | 19篇 |
1989年 | 22篇 |
1988年 | 15篇 |
1987年 | 8篇 |
1986年 | 4篇 |
1985年 | 6篇 |
1984年 | 7篇 |
1983年 | 2篇 |
1982年 | 3篇 |
1981年 | 1篇 |
1980年 | 3篇 |
1979年 | 1篇 |
1978年 | 6篇 |
1977年 | 2篇 |
1976年 | 1篇 |
1954年 | 2篇 |
排序方式: 共有4150条查询结果,搜索用时 15 毫秒
261.
A simple two-domain bucket model of fractured soil was coupled with a stochastic model of rainfall variability, in order to investigate the climate and soil controls upon the stochastic properties of the triggering of fracture flow and surface runoff, and the partitioning of rainfall between the matrix and fracture domains and surface runoff. Conventionally, soils are regarded as time domain filters between rainfall and hydrological response. This investigation highlights an additional type of threshold filtering especially important in understanding the infiltration behaviour of fractured soils, for which an event-based characterisation of rainfall in modelling is crucial. A priori-definable indices were derived which are capable of describing elements of this threshold filtering, by allowing the statistical properties of fracture flow- and surface runoff-triggering storms (i.e., mean and variance of storm duration, intensity and effective inter-storm period, as well as cumulative partitioning of rainfall), to be inferred directly from average storm and soil properties. Using these indices, the long-term response of fractured soils, including the long-term hydrological importance of fractures, can be estimated without simulation. 相似文献
262.
Muthukumar Anbazhagi Dhanraj Loganathan Subramani Tamilselvan Raj Jayabalou Senthilkumar Kamatchiammal Rakesh Kumar 《洁净——土壤、空气、水》2007,35(2):167-171
Cryptosporidium is an enteric parasitic protozoan capable of causing chronic diarrhea. One of the most common modes of transmission is through faeces‐contaminated water. This study determines the distribution of Cryptosporidium oocysts for the first time in Chennai City's drinking water supply. 199 drinking water samples were collected from ten zones of the city. In the water samples Cryptosporidium, a common pathogenic protozoan of the gastrointestinal tract, has been analyzed physico chemically as well as microbiologically for heterotrophic organisms and total coliforms (TC). The studies revealed that three zones of the city were highly contaminated with coliforms and parasitic protozoa. A statistical analysis was done to find any correlation between heterotrophic organisms, total coliforms, and oocysts. Even though a positive correlation exists between oocysts and bacteriological parameters, a regression equation shows that heterotrophic plate count (HPC) and total coliforms were only 20% responsible for the presence of oocysts. The level of Cryptosporidium oocysts isolated from the water samples may present a public health hazard although no major outbreaks have so far been reported in Chennai City. Routine surveillance of water quality throughout the city is needed to curb the pollutants. 相似文献
263.
The numerical and proportional distributions of zoobenthos in lake Uluabat, which is located in the Northwestern part of Turkey and having international importance according to the Ramsar Convention, were determined from August 2004 to July 2005 at monthly intervals (except for December 2004, January and February 2005) at 12 different stations. Thirty‐three taxonomic groups were recorded. It was found that the zoobenthos consisted of 35.6 % Oligochaeta, 27.7 % Nematoda, 12.3 % Chironomidae larvae, 10.7 % Gastropoda, 3.6 % Ostracoda, and 10.1 % Varia by numbers (Bivalvia, Ceratopogonidae, Hirudinea, Odonata, Ephemeroptera, Asilidae, Hydraacarina, Hemiptera, Argulidae, and Gammaridae). The average number of invertebrates was 160 individuals for 33 taxa at the 12 different stations. Also some environmental parameters of the lakewater were analyzed (temperature, pH, dissolved oxygen, biochemical oxygen demand, chemical oxygen demand, NO2–N, NO3–N, NH3–N, PO4–3, fecal coliform, and total coliform). The relationships between the dynamics of the Oligochaeta and the physicochemical variables were supported by the Pearson correlation index and the canonical correspondence analysis (CANOCO). It was found that the relation between the average number of P. hammoniensis and P. albicola (p < 0.05, r = 0.590 and 0.593, respectively) and L. hoffmeisteri (p < 0.01, r = 0.777) was directly proportional while the relation between the average number of some taxa Trichodrillus sp., Rhyacodrilus coccineus, Nais communis, N. variabilis, and N. barbata and NO3–N (p < 0.05, r = –0.685) was inversely proportional. 相似文献
264.
Wagner José Barreto Ieda Scarminio Maria Cristina Solci Dílson Norio Ishikawa Melissa Tiemi Ogasawara Sônia Naomi Nomi Sônia Regina Giancoli Barreto 《洁净——土壤、空气、水》2007,35(3):239-245
Seventeen physical and chemical parameters were obtained from a hydroelectric reservoir located in a tropical region in the south of Brazil. Multivariate Principal Component Analysis (PCA) and Hierarchical Group Analysis (HGA) were used to identify the parameters discriminating the origin of water from the Tibagi and the Primeiro de Maio River, after it has passed the mixing region. The study was conducted during the dry and rainy seasons in July 2002 and February 2003 at three depths and three sampling sites located 0, 5, and 10 km away from the mixing region. The statistical methods showed to be appropriate for identifying the contribution of each tributary in the water mixing site of a complex water system. The most important discriminating parameter was the absorbance relation A(253 nm)/A(203 nm), followed by the concentrations of Fe(III), Mn(III), and Ni(II). An anthropogenic interference was found in the reservoir due to high Ni(II) and orthophosphate concentrations caused by a nearby town sewage discharge. The interference was more important during the dry periods due to the lower dispersion of the pollutants. Urgent initiatives should be taken from the state government to build treatment stations for the wastewater of the small cities around the Capivara hydroelectric reservoir to prevent the drinking water quality from deteriorating. 相似文献
265.
266.
Prediction of surface horizontal displacements, and gravity and tilt changes caused by filling the Three Gorges Reservoir 总被引:11,自引:0,他引:11
Horizontal displacements, and gravity and tilt changes induced by filling the Three Gorges Reservoir are modeled using elastic
loading Green functions. When the water surface reaches its highest level, the effects become maximum on the reservoir banks.
The longitudinal and latitudinal components of the horizontal displacements reach −8.2 and 7.7 mm respectively, gravity is
increased by up to 3.4 mGal, and the prime vertical and meridian components of the tilt changes are −7.8 and −17.5 arcseconds
respectively. Accordingly, the filling of the reservoir will influence values observed from global positioning system (GPS),
gravimetry and tilt measurements in the area. The results given can be used to provide important corrections for extracting
earthquake-related signals from observed data.
Received: 19 January 2001 / Accepted: 3 September 2001 相似文献
267.
268.
淄博市大武水源地地下水水位总体预测 总被引:1,自引:0,他引:1
本文采用水均衡法对淄博市大武水源地地下水位变动进行研究,并对降水量与人渗补给量的关系以及平均给水度随地下水位的变化关系进行了分析。通过历史资料的验证,表明本文所建立的水均衡模型对于地下水位变动的预测是可靠的,而且简单可行,随后根据不同的地下水开采量等对未来地下水位的变动趋势进行了预测。 相似文献
269.
采用不同的方法研究了河北万全水位异常与区域中强地震活动的关系,发现万全深井水位在1989年10月18日山西大同-阳高6.1级地震前及1998年1月10日河北张北6.2级地震前有趋势性变化,水位有大于50mm的瞬时突升突降的变化。指出,万全深水井水位的形态变化和瞬间突升突降变化似可作为晋冀蒙三省交界区地震趋势判断的依据。 相似文献
270.
APPLICATION OF A NEW METHOD IN STUDYING THE SCATTERED STAGE-DISCHARGE RELATIONSHIP OF UNSTEADY FLOWS 总被引:2,自引:0,他引:2
1 INTRODUCTIONThe macroscopic vedation of the stage-discharge relationship of unsteady nows in alluvial rivers is animPortant and comPlex problem. The Jinjiang reach of the Middle Yangtze Xiver swells often and theflood defence of the reach is the most serious. The stage-discharge relationship is the basic featore of theflow characteristics. The three hydrological stahons, Chenglingii station (at the exit of the DongtingLak), Jianll station and Luoshan station, are key stations on the… 相似文献