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991.
Jiaqi Chen 《中国地理科学(英文版)》1994,4(2):129-133
In Taihu Lake basin during June–July in 1991, there happened a catastrophic flood, the precipitation reached that of 1954
and the water level was the highest in the history in Taihu Lake. This heavy flood, happening in the relatively humid period
and being well accord with flood-drought change tendency, was early precautioned. The occurrence of the flood illustrated
that using records of historical climate to predict flood-drough tendency is practically significant for hazard-reduction
project. 相似文献
992.
程其畴 《中国地理科学(英文版)》1996,6(2):185-191
ECOLOGIC ENVIRONMENT OF TARIM RIVER AND ITS PROTECTIVE PROGRAMME ChengQichou(程其畴)XinjiangInstituteofGeography,theChineseAcade... 相似文献
993.
Spectrum analyses of water quality time series have been carried out for five hydrometric stations including Wuhan hydrometric
station of the Changjiang(Yangtze) River, etc. The fluctuations of Ca2+, Mg2+ and HCO
3
−
concentrations in river water under different physical geography conditions have about two-year cycle which is corresponding
to hydrometeorological quasi-biannual-oscillation (QBO). Na+, Cl− SO
4
2−
have about two-year cycle in the area lightly affected by human activities while two-year cycle doesn’t exist in the area
heavily affected by human activities. All the fluctuations of major ions have about three-month cycle. The river diseharge
fluctuation accounts for 43.9%, 45.1%, 54.3%, 33.9%, 30.3% and 42.7% of the variance of Ca2+, Mg2+, HCO
3
−
, Na+, Cl−, SO
4
2−
, respectively, at Wuhan from 1962 to 1985. According to the spectrum characteristic of major ions, the duration of the time
series has to be at least 13 years for trend analysis of monthly water quality data.
Foundation item: Under the auspices of the National Natural Science Foundation of China (No. 49671017).
Biography: XIA Xing-hui(1971-), female, a native of Hunan Province, Ph. D. Her research interest includes environmental chemistry. 相似文献
994.
卢秀容 《广东海洋大学学报》2001,21(4):47-51
在市场经济的条件下,渔业企业作为一个独立的投资主体,对任何一项投资,它都会考虑其经济效益.本文通过一个实例,阐述了渔业企业在投资之前,如何从财务上评估该项投资的经济效益. 相似文献
995.
996.
当前,由于缺乏对气象服务投入量与产出量准确而完整的统计,要对气象服务的各种经济效益作出总体评价是困难的。然而,在专项气象服务中,却不乏原始、完整而准确的资料。作者从此出发,讨论了专项气象服务经济效益评价的理论。并通过实地调查,以彭州市气象局几项专项气象服务为例探讨了评价技术。 相似文献
997.
After the survey of pollution sources, a study on surface water quality assessment and forecast is given by means of grey
system method, fuzzy mathematical method and multiple-index method. Based on it, aquatic environment quality features, treatment
measures and environmental strategies of the area are proposed. The quality of aquatic environment of 5 rivers in the Tumen
River area is studied. The results show that the pollution of surface water is serious; water quality of most rivers is between
grade IV and V except the Hunchun River, being higher than grade IV standard; pollution levels of most rivers have been basically
controlled except the of Burhatong River, which is deteriorating gradually. Pollutants of the rivers are comparatively regular,
mainly are SS, COD, BOD, AR-OH, NH3-N. The main pollution trades are chemical fibre industry, pulp and paper making industry and mining industry. If the growth
rate of gross industrial product is higher than 25 percent under the encouraging-model of regional exploitation, the pollutants’
load will overtake the bearing capacity of aquatic environment. Thus some protection program against pollution must be worked
out in order to achieve the harmonious development of economy society and environment.
A project from “Studies on Earlier Stage of Regional Development” of the Chinese Academy of Sciences 相似文献
998.
999.
The supraregional GIS-supported stochastical model, WEKU, for the determination of groundwater residence times in the upper
aquifers of large groundwater provinces is presented. Using a two-dimensional analytical model of groundwater flow, groundwater
residence times are determined within two extreme cases. In the first case, maximal groundwater residence times are calculated,
representing the part of groundwater, that is drained by the main surface water of a groundwater catchment area. In the second
case, minimal groundwater residence times for drainage into the nearest surface water are determined. Using explicit distribution
functions of the input parameters, mean values as well as potential ranges of variations of the groundwater residence times
are derived. The WEKU model has been used for the determination of groundwater residence times throughout Germany. The model
results – mean values and deviations of the groundwater velocity and the maximal and minimal groundwater residence times in
the upper aquifers – are presented by general maps and discussed in detail. It is shown that the groundwater residence times
in the upper aquifer vary regionally, differentiated between less than 1 year and more than 2000 years. Using this information,
the time scales can be specified, until measures to remediate polluted groundwater resources may lead to a substantial groundwater
quality improvement in the different groundwater provinces of Germany. With respect to its supraregional scale of application,
the WEKU model may serve as a useful tool for the supraregional groundwater management on a state, federal or international
level.
Received: 15 August 1995 · Accepted: 15 October 1995 相似文献
1000.
本文以丰富的实际资料,论证了地下水的卤素元素(F、Cl、Br、I)的形成、含量及其分布规律与含水介质成分、上覆岩土性质、地下水退流条件、氧化还原环境、地下水矿化度之间的关系。根据江汉平原东部区和鄱阳湖区地下水中Br、I元素的调查研究结果及它们形成的控制因素与分布规律,结合长江三角洲南部区水文地球化学环境条件分析对比,指出该区是一个形成Br、I矿泉水的有利地区。 相似文献