全文获取类型
收费全文 | 14087篇 |
免费 | 2088篇 |
国内免费 | 1545篇 |
专业分类
测绘学 | 5045篇 |
大气科学 | 827篇 |
地球物理 | 2488篇 |
地质学 | 5460篇 |
海洋学 | 1374篇 |
天文学 | 227篇 |
综合类 | 1290篇 |
自然地理 | 1009篇 |
出版年
2024年 | 19篇 |
2023年 | 98篇 |
2022年 | 402篇 |
2021年 | 466篇 |
2020年 | 503篇 |
2019年 | 564篇 |
2018年 | 356篇 |
2017年 | 501篇 |
2016年 | 448篇 |
2015年 | 521篇 |
2014年 | 787篇 |
2013年 | 817篇 |
2012年 | 961篇 |
2011年 | 917篇 |
2010年 | 853篇 |
2009年 | 962篇 |
2008年 | 945篇 |
2007年 | 1089篇 |
2006年 | 1037篇 |
2005年 | 838篇 |
2004年 | 762篇 |
2003年 | 711篇 |
2002年 | 521篇 |
2001年 | 511篇 |
2000年 | 443篇 |
1999年 | 367篇 |
1998年 | 342篇 |
1997年 | 211篇 |
1996年 | 179篇 |
1995年 | 119篇 |
1994年 | 111篇 |
1993年 | 92篇 |
1992年 | 73篇 |
1991年 | 40篇 |
1990年 | 36篇 |
1989年 | 24篇 |
1988年 | 25篇 |
1987年 | 19篇 |
1986年 | 10篇 |
1985年 | 5篇 |
1984年 | 13篇 |
1983年 | 4篇 |
1982年 | 4篇 |
1981年 | 3篇 |
1980年 | 2篇 |
1979年 | 3篇 |
1978年 | 2篇 |
1976年 | 2篇 |
1974年 | 1篇 |
1973年 | 1篇 |
排序方式: 共有10000条查询结果,搜索用时 31 毫秒
991.
992.
根据中奥(奥地利)两国政府1992-1994年科技合作协议,开展了《北京山区荒溪分类与危险区制图技术研究》.介绍了该研究的目的、方法与成果,根据实践的经验,提出了进一步开展荒溪危险区制图的有关建议. 相似文献
993.
本文讨论了GPS工程控制网的最优化设计问题;通过对GPS工程控制网的精度和可靠性分析,建立了应用点位精度矩阵相关性优化GPS网的数学模型;针对解算中存在的问题,提出了最短路径法寻找整数变量线性规划问题的最优解。 相似文献
994.
天山山区公路山地灾害主要出现于海拔>3000米的现代冰缘区,遭山地灾害威胁较严重的是独山子—库车公路和乌鲁木齐—库尔勒公路。较突出的山地灾害是雪崩、风吹雪、自然积雪、泥石流与石冰川,其次是倒石堆、热融滑塌和热融掏蚀。该区公路山地灾害防治应采取预防为主、防治结合的原则,此外应加强灾害预报。 相似文献
995.
J.M.ANDRADE D.PRADA S.MUNIATEGUI Department of Analytical Chemistry Universidade da Corun La Zapateir E- Corun Spain B.GOMEZ M.PAN Analytical Laboratory Complejo Industrial Repsol Petróleo S.A.de La Corun Poligono Bens Corun Spain Author to whom correspondence should be addressed. 《地理学报(英文版)》1993,(5)
This paper deals with a typical question encountered in all industrial analytical laboratories:are all thetests performed in the laboratory to characterize the final product really necessary?In this work the cross-validation technique,Procrustes rotation techniques and statistical variable selection have been used toreduce the 26 initial British Petroleum and ASTM kerosene specification tests to ten'essential'ones.Statistical as well as chemical considerations were used to select the optimum subset of original variablesto be retained from all the possible ones. 相似文献
996.
利用GPS载波相位观测值进行基线测定具有重要意义。本文讨论了基线测定中卫星星历误差对定位结果的影响,提出了基线上轨道改进的定位方法,编制了基线测定的定位软件,并使用高精度基线上的实际观测资料进行了计算。计算结果表明在基线上用轨道改进定位方法是可行的,可以提高定位精度。 相似文献
997.
Summary Formulation and case studies of a three dimensional kinematic model are presented. Thein situ overburden geometry can be simulated accurately and various initiation patterns of blasts can be modelled. The overburden geometry, hole patterns and explosive distribution are all explicit model inputs. Because the effect of explosive properties, rock mass condition and inter-row delay are very difficult to measure in terms of blast performance, these are represented in the model by control parameters which are left for calibration using field data. The output of the model is a three dimensional muckpile shape of any cross section and a contour map of grade distribution within the muckpile. Two case studies are presented which have shown that the model is a valuable tool for optimizing production blasting as well as for controlling grade dilution during blasting. 相似文献
998.
Assessment of reliability in water distribution networks using entropy based measures 总被引:2,自引:0,他引:2
K. Awumah I. Goulter S. K. Bhatt 《Stochastic Environmental Research and Risk Assessment (SERRA)》1990,4(4):309-320
Entropy based expressions for measurement of reliability and redundancy have recently been reported. These measures approach assessment of the reliability of the distribution network from the intrinsic redundancy of the network layout. The paper extends earlier work on entropy functions by including a more explicit statement of the alternate paths available in the network and by recognizing that under certain circumstances, e.g., failure of some part of the network work, an outflow link from a node under normal working condition may become an inflow link to the same node. The measures are assessed by comparison with parameters measuring Nodal Pair Reliability and percentage of flow supplied at adequate pressure for a range of networks and link failure conditions in this networks. The entropy measures are shown to reflect changes in the network reliability, as measured by these two comparative parameters, very well. 相似文献
999.
Cost-effective network design for groundwater flow monitoring 总被引:1,自引:0,他引:1
The extensive use of groundwater resources has increased the need for developing cost-effective monitoring networks to provide an indication of the degree to which the subsurface environment has been affected by human activities. This study presents a cost-effective approach to the design of groundwater flow monitoring networks. The groundwater network design is formulated with two problem formats: maximizing the statistical monitoring power for specified budget constraint and minimizing monitoring cost for statistical power requirement. The statistical monitoring power constraint is introduced with an information reliability threshold value. A branch and bound technique is employed to select the optimal solution from a discrete set of possible network alternatives. The method is tested to the design of groundwater flow monitoring problem in the Pomona County, California. 相似文献
1000.
《矿产资源法》颁布实施五周年,通过宣传贯彻,增强了广大干部、群众依法办矿的法制观念,推动了各项矿管工作的开展,依法办矿的矿山取得了采矿权,非法采矿的小矿山被关闭,违法行为受到查处,矿管部门的声望越来越高,促讲了依法治矿。宣传贯彻《矿产资源法》要领导首先学法,提高认识,加强领导,建立一支专兼结合的宣传队伍,采取多种形式有重点地进行宣传教育。我国、我省面临矿产资源形势是严峻的,浪费矿产资源的现象仍存在,要继续深入宣传贯彻《矿产资源法》。 相似文献