全文获取类型
收费全文 | 11515篇 |
免费 | 1263篇 |
国内免费 | 1536篇 |
专业分类
测绘学 | 4129篇 |
大气科学 | 1249篇 |
地球物理 | 2051篇 |
地质学 | 3099篇 |
海洋学 | 1070篇 |
天文学 | 477篇 |
综合类 | 1244篇 |
自然地理 | 995篇 |
出版年
2024年 | 18篇 |
2023年 | 60篇 |
2022年 | 142篇 |
2021年 | 218篇 |
2020年 | 228篇 |
2019年 | 321篇 |
2018年 | 249篇 |
2017年 | 401篇 |
2016年 | 392篇 |
2015年 | 471篇 |
2014年 | 583篇 |
2013年 | 718篇 |
2012年 | 732篇 |
2011年 | 752篇 |
2010年 | 628篇 |
2009年 | 835篇 |
2008年 | 921篇 |
2007年 | 944篇 |
2006年 | 915篇 |
2005年 | 726篇 |
2004年 | 684篇 |
2003年 | 589篇 |
2002年 | 493篇 |
2001年 | 396篇 |
2000年 | 393篇 |
1999年 | 287篇 |
1998年 | 254篇 |
1997年 | 216篇 |
1996年 | 138篇 |
1995年 | 135篇 |
1994年 | 118篇 |
1993年 | 85篇 |
1992年 | 64篇 |
1991年 | 37篇 |
1990年 | 40篇 |
1989年 | 25篇 |
1988年 | 27篇 |
1987年 | 13篇 |
1986年 | 17篇 |
1985年 | 17篇 |
1984年 | 6篇 |
1983年 | 4篇 |
1981年 | 6篇 |
1980年 | 8篇 |
1979年 | 4篇 |
1976年 | 1篇 |
1974年 | 1篇 |
1954年 | 2篇 |
排序方式: 共有10000条查询结果,搜索用时 15 毫秒
951.
Abstract Isotopic analyses of organic carbon from the mid-Cretaceous sequence in Hokkaido, Japan, revealed a 2‰ positive excursion of δ13C values at the biostratigraphically defined Cenomanian/Turonian (C/T) boundary recognized in the Yezo Group. The planktonic foraminiferal Whiteinella archaeocretacea Zone, which is known to bracket the Cenomanian/Turonian boundary elsewhere in the world, was recognized in the Oyubari area of central Hokkaido based on the distribution of commonly occurring planktonic foraminifera. In the Tappu area of northwestern Hokkaido, where diagnostic planktonic foraminifera are rare but calcareous nannoplankton occur commonly, the interval coeval with the W. archaeocretacea Zone can also be established by recognizing the conjoined last appearance levels of Corollithion kennedyi and Axopodorhabdus albianus, both calcareous nannoplankton species. Carbon isotope profiles exhibit a similar pattern with comparable peaks and troughs occurring in the same stratigraphic position in the sequences. A prominent, positive 2‰ shift of δ13C values, here called ‘δ13C spike’ occurs in the middle of the W. archaeocretacea Zone in the Oyubari area and just above the conjoined last appearances of the two above-mentioned nannoplankton taxa in the Tappu area. The Cenomanian/Turonian boundary can be drawn just above the peak position of the spike in both sections. The Rock Eval analyses and biomarker analyses of organic carbon indicate that organic carbon subjected to our isotope analyses is of terrestrial origin. Therefore, the observed 2%o shift should reflect changes in the isotopic composition of the atmospheric CO2. A unique layer composed predominantly of sand-grain sized spumellarian Radiolaria is present immediately above the δ13C spike both in the Oyubari and Tappu areas, suggesting an increasing availability of both nutrients and silica in surface waters. 相似文献
952.
王建民 《紫金山天文台台刊》1999,18(3):271-273
频繁的超新星爆发可用以解释活动星系核与类星体的超高金属丰度。星团中的恒星与吸积盘相互作用导致致密天体中子星和黑洞的形成率很高,这些致密天体与红巨星很容易形成双星系统,而后形成(NS/BH,NS/BH) 双星由于引力辐射最终导致并合而形成伽玛射线爆发。我们估计了伽玛射线爆的爆发频率,发现与观测相符。 相似文献
953.
根据1992年和1995年两期GPS测量结果所获得的位移场和应变场,结合丰富的地质资料,利用有限元方法对华北地区现今构造应力场进行了数值模拟。计算结果表明:华北地区现今构造应力场主压应力方向为NEE,其边界力除受NE55°~SW235°方向的压应力作用外,同时还受到SE120°~NW300°方向的拉张力作用,其中NE-SW的压应力量值较大,约为SE-NW向拉应力的两倍,这个结果与震源机制解所获得的应力场方向基本一致。这一应力场状态是两种动力学过程的叠加:一是印度板块和太平洋板块的挤压,其中来自印度板块的作用力最大,约为太平洋板块作用力的1.5倍;另一个是因地幔隆起而产生的NW-SE向的水平拉张力。 相似文献
954.
Chol-qeshlaghi altered area lies in the northwestern part of the post-collisional Urumieh-Dokhtar magmatic arc, NW Iran. Pervasive silicic, argillic, phyllic and propylitic altered zones appears to be intimately affiliated to the fluids derivative of upper Oligocene Khankandi granodiorite. This paper is dedicated to the identification of geochemical characteristics of hydrothermal alterations, focusing on the determination of the mass gains and losses of REEs, to gain significant insights regarding the chemical exchanges prevailed between the host rocks and hydrothermal fluids. The low pH and high activity of SO_4~(-2) ligands in silicic alteration fluids, resulting in depletion of entire REEs. Decreasing of LREEs appeared in argillic zone may attributed to reduce in adsorption ability of clay minerals in low pH; whereas HREEs enrichment in phyllic zone was inclined to put it down to the abundance of sericite(± Fe oxides). A significant reduction of Eu/Eu* ratio in silicic zone can be attributed to negligible sulfides and clay minerals as some effective agents in adsorption of released Eu~(+2). Factors such as changes in pH, the abundance of absorptive neomorph mineral phases, activity of ligands play an important role in controlling the distribution and concentration of REEs in Chol-qeshlaghi alteration system. 相似文献
955.
The Qingchengzi orefield is a large polymetallic ore concentration area in the Liaodong peninsula,northeastern China,that includes twelve Pb-Zn deposits and five Au-Ag deposits along its periphery.The ore-forming age remains much disputed,which prevents the identification of the relationship between the mineralization and the associated magmatism.In this paper,we quantitatively present the feasibility of making ore mineral ~(40)Ar/~(39)Ar dating and report reliable ~(40)Ar/~(39)Ar ages of lamprophyre groundmass,K-feldspar and sphalerite from the Zhenzigou deposit.Direct and indirect methods are applied to constrain the timing of mineralization,which plays a vital role in discussing the contribution of multistage magmatism to ore formation.The low-potassium sphalerite yielded an inverse isochron age of 232.8±41.5 Ma,which features a relatively large uncertainty.Two lamprophyre groundmasses got reliable inverse isochron ages of 193.2±1.3 Ma and 152.3±1.5 Ma,respectively.K-feldspar yielded a precise inverse isochron age of 134.9±0.9 Ma.These four ages indicate that the mineralization is closely associated with Mesozoic magmatism.Consequently,regarding the cooling age of the earliest Mesozoic Shuangdinggou intrusion(224.2±1.2 Ma)as the initial time of mineralization,we can further constrain the age of the sphalerite to 224–191 Ma.These new and existing geochronological data,combined with the interaction cutting or symbiotic relationship between the lamprophyre veins and ore veins,suggest that the Pb-Zn-Au-Ag mineralization in the Qingchengzi orefield mainly occurred during three periods:the late Triassic(ca.224–193 Ma),the late Jurassic(ca.167–152 Ma)and the early Cretaceous(ca.138–134 Ma).This polymetallic deposits are shown to have been formed during multiple events coinciding with periods of the Mesozoic magmatic activity.In contrast,the Proterozoic magmatism and submarine exhalative and hydrothermal sedimentation in the Liaolaomo paleorift served mainly to transport and concentrate the ore-forming substances at the Liaohe Group with no associated Pb-Zn-Au-Ag mineralization. 相似文献
956.
用NCEP/NCAR再分析辐射资料估算月平均地表反照率 总被引:16,自引:1,他引:15
本文利用1979年 ̄1995年17年平均的NCEP/NCAR(National Center for Environmen-tal Prediction/National Center for Atmospheric Research,美国国家环境预报中心/美国国家大气研究中心)再分析辐射资料估算了全球月平均地表反照率.从所得结果的时空分布来看,用NCEP/NCAR辐射资料得到的全球地表反照率基本 相似文献
957.
运用块体不连续变形分析方法 ,对利用GPS测量数据解算中国大陆及其周边块体的位移进行分析。结果显示 ,除块体 2、10、13为近东西方向的运动 ,块体 15为近北东向的运动外 ,其余块体均朝南东或南东东方向运动。同时 ,各块体还以各自的角速度绕其重心旋转。整个研究区在南北方向是压缩的 ,所得的最大主应力方向与利用震源机制解与原地应力测量的结果总的来说大体一致。最后 ,对产生中国大陆及周边块体运动与变形的动力源进行了讨论 相似文献
958.
CT-1地震计传递函数测试仪的设计 总被引:6,自引:4,他引:2
将计算机控制技术应用到甚宽频带地震计的传递函数测试中。讨论了基本的测试方法和原理,阐述了传递函数测试系统的软、硬件设计,给出了测试系统的应用实例。该测试系统具有正弦波自动扫频、阶跃信号法和脉冲信号法等标定方法,满足了甚宽频带地震计的传递函数测试在观测频带、动态范围和测试精度等方面的要求。 相似文献
959.
Inadequate theoretical conceptualization of person/environment relations has characterized behavioral geography as an eclectic and incoherent subfield. Past work has failed to appreciate the person/environment unity as an entity of change. A transactional/transformational perspective is adopted in this paper as a basis for understanding the relationships between the dynamics of human behavior and the dynamics of the environment. Two conceptual models are developed which provide bases for understanding (i) different modes of person/environment transformation, and (ii) human behavior as it mediates change. The potential relevance of a transactional perspective for empirical research in behavioral geography is noted. 相似文献
960.
Noel Cressie 《Mathematical Geology》1985,17(7):693-702
The relative variogram has been employed as a tool for correcting a simple kind of nonstationarity, namely that in which local variance is proportional to local mean squared. In the past, this has been linked in a vague way to the lognormal distribution, although if {Zt; t D}is strongly stationary and normal over a domain D,then clearly {exp (Zt); t D}will stillbe stationary, but lognormal. The appropriate link is made in this article through a universal transformation principle. More general situations are considered, leading to the use of a scaled variogram. 相似文献