全文获取类型
收费全文 | 5603篇 |
免费 | 1021篇 |
国内免费 | 1475篇 |
专业分类
测绘学 | 375篇 |
大气科学 | 777篇 |
地球物理 | 915篇 |
地质学 | 4351篇 |
海洋学 | 734篇 |
天文学 | 38篇 |
综合类 | 391篇 |
自然地理 | 518篇 |
出版年
2024年 | 19篇 |
2023年 | 70篇 |
2022年 | 166篇 |
2021年 | 186篇 |
2020年 | 167篇 |
2019年 | 212篇 |
2018年 | 182篇 |
2017年 | 233篇 |
2016年 | 253篇 |
2015年 | 256篇 |
2014年 | 374篇 |
2013年 | 309篇 |
2012年 | 390篇 |
2011年 | 418篇 |
2010年 | 369篇 |
2009年 | 414篇 |
2008年 | 385篇 |
2007年 | 423篇 |
2006年 | 412篇 |
2005年 | 356篇 |
2004年 | 301篇 |
2003年 | 308篇 |
2002年 | 253篇 |
2001年 | 215篇 |
2000年 | 209篇 |
1999年 | 200篇 |
1998年 | 145篇 |
1997年 | 153篇 |
1996年 | 137篇 |
1995年 | 100篇 |
1994年 | 97篇 |
1993年 | 79篇 |
1992年 | 73篇 |
1991年 | 43篇 |
1990年 | 36篇 |
1989年 | 24篇 |
1988年 | 13篇 |
1987年 | 9篇 |
1986年 | 10篇 |
1985年 | 9篇 |
1984年 | 6篇 |
1983年 | 18篇 |
1982年 | 9篇 |
1981年 | 11篇 |
1980年 | 16篇 |
1979年 | 8篇 |
1977年 | 4篇 |
1976年 | 4篇 |
1974年 | 4篇 |
1954年 | 3篇 |
排序方式: 共有8099条查询结果,搜索用时 78 毫秒
51.
Refraction of incoherent random gravity waves with currents and bottom topography results in spatial variations in the spectral characteristics of the free surface. Prediction of such variations based on the radiation transfer equation is in a simple analytic form for the case of one dimensional inhomogeneities in currents and topography. This analytic form is examined in terms of two-dimensional wave number- and polar frequency-direction spectra along the associated dynamic and kinematic constraints relevant to wave breaking and reflection. Results are specialized to the simplest case of horizontal shear currents in deep and shallow water with explicit examples to illustrate the relative and combined effects of currents and topography on free surface spectra. 相似文献
52.
我国东部邻海恶劣天气的时空分布及其成因初探 总被引:2,自引:0,他引:2
本文利用1930~1979年NCDC海洋船舶观测的气象资料,分析了中国东部邻海恶劣天气的时空分布。结果表明,海区恶劣天气的分布在冬季和夏季是不同的;在东北和西南季风期间,台湾东北和西南海区也有差异。影响恶劣天气条件的分布因子非常复杂,主要是季风和极锋、天气系统、冷暖洋流及地形等因子。 相似文献
53.
54.
人工养殖点带石斑鱼弧菌病病原菌的分离及鉴定 总被引:8,自引:1,他引:8
广东、海南两省多个海水网箱养殖场养殖的点带石斑鱼(Epinephelus malabaricus)发生严重的弧菌病,从海南三亚和广东深圳的发病鱼病灶上分离到2株致病性细菌VAL02和VAL00,经人工回接感染实验证明这2株菌引起点带石斑鱼弧菌病,VAL02对点带石斑鱼苗的半致死量是2.25×10~5 cfu/g。经形态及生理生化特征分析,鉴定出VAL02及VAL00均为溶藻弧菌。应用药敏纸片法研究了22种化学疗剂对VAL02及溶藻弧菌标准株的生长抑制作用,发现VAL02对氯霉素、氟哌酸、卡那霉素和乙酰螺旋霉素等产生耐药性,对复方新诺明和环丙沙星等敏感。 相似文献
55.
青岛地区的台风暴潮与潮灾 总被引:3,自引:0,他引:3
本文分析了青岛沿海地区的台风暴潮灾害状况,给出了潮位与海浪的联合作用对灾的影响关系式,提出了今后风暴潮预报的思路。 相似文献
56.
A series of transient tests were conducted to determine the seafloor coupling characteristics of a new ocean-bottom seismometer (OBS) developed for the United States Office of Naval Research (ONR). The OBS comprises a large recording package and a separate sensor package that is deployed from the recording package. In addition to the coupling characteristics of both the sensor and the recording packages, the seismic energy radiated from the main recording package as a result of motion of the recording package was measured. The observed vertical coupling resonances of both the recording package and the sensor package are in good agreement with those predicted by a simple model of soil-structure interaction. The most important result of this study is that significant energy is radiated from the recording package in response to horizontal motions of the recording package. When the sensor package is 1 m from the recording package, the amplitude of the recorded signal is similar to that recorded in the recording package. In the field, this effect will result in distortion of seismic signals and increased background noise recorded by the sensor package if the recording package is disturbed by seafloor currents or biological activity. The amplitude of this signal attenuates by approximately a factor of two as sensor/recorder separation is increased from 1 to 6 m, suggesting that an improved response can be achieved by increasing the separation between the recording package and the sensors. This effect is much less severe for vertical disturbances of the recording package. 相似文献
57.
对海洋来源的Vibro sp.QY102的产褐藻胶裂解酶的发酵条件进行研究。结果表明,该菌株最适液体培养基成分为(w/v):0.5%褐藻酸钠;0.4%蛋白胨;0.3%KH2PO4;0.7%K2HPO4.3H2O;2%NaCl;0.01%MgSO4.7H2O,pH=6.0。按3%的接种量接入培养基,30℃150 r/min振荡培养120 h,产酶达到10.2 U/mL,为优化前的4.5倍。Mg2 是该菌株产酶所必需的,这在其他褐藻胶裂解酶生产菌株中未见报道。该菌株产酶发酵条件的研究,为褐藻胶裂解酶的大规模制备及应用奠定了基础。 相似文献
58.
59.
Stanislav D. Furta 《Celestial Mechanics and Dynamical Astronomy》1992,53(3):255-266
The author considers a problem of Lyapunov's stability of relative equilibria of a flexible nonstretchable thread attached to the satellite moving in a circular Keplerian orbit in the first approximation. When it is in the position of relative equilibrium, the thread is known to be situated either along the radius vector of the orbit (the radial equilibrium) or along the circular orbit (the tangential equilibrium) and in each case the thread can be in a folded state. The author shows that folded radial equilibria of the thread are always unstable while tangential ones are unstable if the thread is sufficiently short in comparison with the radius of the orbit. The generalized Chetaev functional has been constructed to prove the instability. 相似文献
60.