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491.
河北平原地下水氢、氧、碳、氯同位素组成的环境意义 总被引:15,自引:0,他引:15
地下水是古气候信息的载体,它的化学成分和同位素组成可以反映古气候的演变。应用3H、14C和36Cl资料计算的河北平原地下水的年龄如下:第1含水组(Q4)0~3ka,第2含水组(Q3)3~100ka,第3含水组(Q2)100~300ka,第4含水组(Q1)300~700ka。根据δ18O和δD计算的地下水补给期的地面平均气温表明,第四纪以来河北平原气候环境是逐渐变暖的。根据第4至第1含水组(Q1~Q4)地下水δD=-70‰的等值线变化,认为第四纪以来,渤海海岸线逐渐由东向西移动。 相似文献
492.
本文探讨了层序界面及其附近的地质特征及其构型,建立了三型(Ⅰ,Ⅱ,Ⅲ型)八类层序界面分类方案;Ⅰ型界面包括暴露侵蚀削截面、古土壤面、古喀斯特面和暴露侵蚀界面;Ⅱ型界面包括海平面下降结构转换面和海侵上超界面;Ⅲ型界面包括海底侵蚀成岩间断面和事件界面。运用岩石地层学、生物地层学、磁性地层学及碳氧同位素等多学科,对二叠纪和三叠纪中,二叠与前二叠系之间、二叠与三叠系之间和中下三叠统之间3个主要层序界面进行了探讨,这3个界面分别属于Ⅰ型、Ⅲ型和Ⅰ型界面。提出了层序界面及其附近的地质特征及其地质过程的表现。 相似文献
493.
Abstract Stratigraphic productivity variations of radiolarians below the Permian-Triassic boundary are examined with Ishiga Diagrams in bedded chert sequences of southwest Japan. The diagrams of two different outcrops, drawn from the thickness variation of chert beds, show common stratigraphic variation, which indicates the diagram is a useful tool for correlation of bedded chert sequence. The common stratigraphic productivity variation is also well correlated to a compiled δ13 C excursion of shallow carbonate sequences. Bedded chert records a dramatic extinction event in a shallow surface zone of oceans below the Permian-Triassic boundary. The Permian-Triassic mass extinction is divided into three intervals based on the Ishiga Diagrams, the stratigraphic lithological variation of bedded chert sequences, and the δ13 C curve. The preceding extinction interval in the late Djulfian stage was not as serious an event and the biosphere soon recovered. The event of the main extinction interval commenced in the Dorashamian stage and caused a serious destruction of the biosphere. An event of the aftermath interval during the Early Triassic caused a delay in the recovery from the main extinction interval. 相似文献
494.
P. Digranes R. Mjelde S. Kodaira H. Shimamura T. Kanazawa H. Shiobara E. W. Berg 《Pure and Applied Geophysics》1996,147(4):611-629
Three component recordings from an array of five ocean bottom seismographs in the northwestern part of the Vøring basin have been used to obtain a 2-D shear-wave (S-wave) velocity-depth model. The shear waves are identified by means of travel-time differences compared to the compressional (P) waves, and by analyzing their particle motions. The model has been obtained by kinematic (travel-time) ray-tracing modelling of the OBS horizontal components.The shear-wave modelling indicates that mode conversions occur at several high velocity interfaces (sills) in the 4–10 km depth range, previously defined by a compressional-wave velocity-depth model using the same data set.An averageV
p
/V
s
ratio of 2.1 is inferred for the layers above the uppermost sill, indicative of both poorly consolidated sediments and a low sand/shale ratio. A significant decrease in theV
p
/V
s
ratio (1.7) below the first sill may in part be atributed to well consolidated sediments, and to a change in lithology to more sandy sediments. This layer is interpreted to lie within the lower Cretaceous sequence. At 5–10 km depthV
p
/V
s
ratios of 1.85 indicate a lower sand/shale ratio consistent with the expected lithologies. The averageV
p
/V
s
ratio inferred for the crust is 1.75, which is consistent with values obtained north of Vøring, in the Lofoten area. An eastward thinning of the crystalline basement is supported by the shear-wave modelling. 相似文献
495.
496.
497.
Tectonic and geochemical characteristics and reserved conditions of a mantle source gas accumulation zone in eastern China 总被引:8,自引:0,他引:8
Along both sides of the Tancheng-Lujiang Fracture Zone in eastern China, a series of mantle source gas pools constitute a
massive-scale tectonic accumulation zone in NNE direction, with the mantle geochemical characteristics of high concentrations
of C02 and He, high3He/4He-40Ar/36Ar ratio system and high δ13Coo2 ratios (the main frequency, -3.4%— 4.6%), showing no difference from the tectonic framework of the area. In the area, the
tectonic environment is a rift formed as a result of diapiric mantle injection and crust thinning to form graben-type basins
and lithospheric fractures. The mantle-derived volcanic rocks and inclusions are well-developed and a high geothermal zone
(mantlesource) exists in the area. The characteristics of the three components (solid, liquid and gas) of mantle, concentrated
all over the same tectonic space zone, show that the rift system is of a good tectonic environment or passage for mantle degassing
and gas migration. The main types of the gas pools are volcano, fault-block, anticline, buried hill and so on, but most of
them are combination traps closely related with fracture. For the mantle source gas pools, rift is an optimum tectonic region,
and nearby lithospheric fracture, mantle source volcanic rocks or basement uplifts are a favourable structural location when
reservoir-caprock association develops. 相似文献
498.
499.
Francis P. Miknis Arthur W. Lindner A. John Gannon Mark F. Davis Gary E. Maciel 《Organic Geochemistry》1984,7(3-4)
Solid state 13C NMR techniques of cross polarization with magic-angle spinning, and interrupted decoupling have been employed to examine the nature of the organic matter in eight kerogen concentrates representing five Tertiary deposits in Queensland, Australia. The NMR results show that five of the kerogens have high proportions of aliphatic carbon in their organic matter and correspond to Type I–II algal kerogens. Three of the kerogens, derived from carbonaceous shales, have a high proportion of aromatic carbon in their organic matter and correspond to Type III kerogens. The fractions of aliphatic carbon in all the kerogens, regardless of type, are shown to correlate with the conversion characteristics of the corresponding raw shales during Fischer assay. Interrupted decoupling NMR results show the presence of more oxygen-substituted carbon in the carbonaceous shales, which may account for the greater CO2 evolution and phenolic materials found in the pyrolysis products of the carbonaceous shales. 相似文献
500.