全文获取类型
收费全文 | 1973篇 |
免费 | 471篇 |
国内免费 | 706篇 |
专业分类
测绘学 | 61篇 |
大气科学 | 418篇 |
地球物理 | 498篇 |
地质学 | 1137篇 |
海洋学 | 559篇 |
天文学 | 5篇 |
综合类 | 121篇 |
自然地理 | 351篇 |
出版年
2024年 | 6篇 |
2023年 | 36篇 |
2022年 | 80篇 |
2021年 | 98篇 |
2020年 | 121篇 |
2019年 | 114篇 |
2018年 | 97篇 |
2017年 | 98篇 |
2016年 | 113篇 |
2015年 | 124篇 |
2014年 | 182篇 |
2013年 | 181篇 |
2012年 | 125篇 |
2011年 | 164篇 |
2010年 | 112篇 |
2009年 | 128篇 |
2008年 | 107篇 |
2007年 | 145篇 |
2006年 | 158篇 |
2005年 | 109篇 |
2004年 | 105篇 |
2003年 | 89篇 |
2002年 | 84篇 |
2001年 | 55篇 |
2000年 | 71篇 |
1999年 | 64篇 |
1998年 | 56篇 |
1997年 | 68篇 |
1996年 | 53篇 |
1995年 | 40篇 |
1994年 | 37篇 |
1993年 | 31篇 |
1992年 | 28篇 |
1991年 | 18篇 |
1990年 | 19篇 |
1989年 | 4篇 |
1988年 | 7篇 |
1987年 | 6篇 |
1986年 | 5篇 |
1985年 | 4篇 |
1984年 | 2篇 |
1983年 | 1篇 |
1982年 | 2篇 |
1981年 | 1篇 |
1979年 | 1篇 |
1977年 | 1篇 |
排序方式: 共有3150条查询结果,搜索用时 375 毫秒
961.
A comprehensive numerical study on the three-dimensional structure of a turbulent jet in crossflow is performed. Thejet-to-crossflow velocity ratio (R) varies in the range of 2 ~ 16; both vertical jets and inclined jets without excess streamwisemomentum are considered. The numerical results of the standard two-equation k-~ model show that the turbulent structurecan be broadly categorised according to the jet-to-crossflow velocity ratio. For strong to moderate jet discharges, i.e. R >4, the jet is characterized by a longitudinal transition through a bent-over phase during which the jet becomes almost parallelwith the main freestream, to a sectional vortex-pair flow with double concentration maxima; the computed flow details andscalar mixing characteristics can be described by self-similar relations beyond a dimensionless distance of around 20 ~ 60.The similarity coefficients are only weakly dependent on R. The cross-section scalar field is kidney-shaped and bifurcated,with distinct double concentration maxima; the aspect ratio is found to be around 1.2. A loss in vertical momentum is ob-served and the added mass coefficient of the jet motion is found to be approximately 1. On the other hand, for weak jets instrong crossflow, i.e. R≤ 2, the lee of the jet is characterized by a negative pressure region. Although the double vortexflow can still be noted, the scalar field becomes more symmetrical and no longer bifurcated. The similarity coeffcients are al-so noticeably different. The predicted jet flow characteristics and mixing rates are well supported by experimental and field data 相似文献
962.
Kevin E. McHugh 《The Professional geographer》1989,41(4):429-439
The US Hispanic population has grown rapidly over the last two decades and remains geographically concentrated in nine states. Redistribution away from core states through internal migration has been largely offset by heavy immigration to traditional areas of Hispanic concentration. Geographical patterns of Hispanic miration show broad similarities to overall patterns of population redistribution in the United States. New York and California serve as key spatial redistributors or pivots in the Hispanic migration system. 相似文献
963.
广西云开地区属我国粤西—桂东重要的金银多金属成矿带,区内有金银矿床(点)近80处,受博白—岑溪深断裂带控制,产于前寒武系变质—混合杂岩内,沿NE、NNE向呈带状展布。在论述该区金银矿成矿地质背景基础上,分析了构造控矿特征,赋矿地层及岩浆演化与金银矿化的关系,矿床成因类型及典型矿床地质特征,矿化富集规律等矿床地质特征。在总结该区金银矿成矿条件、找矿标志的基础上指出了找矿远景。 相似文献
964.
I.INTRODUCTIONIntherecentyears,theresearchershavepaidattentiontotheproblemsofcarbonbalanceandcarboncycleintheearthecosystem,withtheincreaseofCQZamountintheearthatmosphere.Mireisoneoftheecotypesinwhichcarbonaccumulationrateisthefastest,anditisthestrongestsinkforac(Branirgd,1980).Butthereislicitedinformationavailableaboutopconcentrationovermire.SomemeasurementsaboutthetemPOralandspatialgradientofopconcentrationhavebeenmadewithinoraboveasugarbeetcanopy(Brown,1970),corncanopy(Alien,1971;R… 相似文献
965.
Jilin Province is one of the main grain-producing provinces of China, which has dominant position in maize production, by the view of its advantages in policy, location, breed and market. And after entering WTO,some measures have been taken to enhance maize competitive ability. But there are some difficulties in concentrating production to maize advantaged areas. This paper expounds the basis that Jilin Province becomes the advantage area of maize, analyzes the problems and puts forward the supporting policy. Some strategic measures are proposed,as developing comparable advantages, carrying out the strategy of un-equilibrium development and cultivating advantaged product areas of maize to rapidly improve the international competitive ability and productivity of maize in Jilin Province, cast the agricultural predicament off and promote the agricultural development into a new stage. 相似文献
966.
Meng Zhaoqin 《地球科学与环境学报》1997,(1)
本文从集中参数模型入手,讨论了单自由度和多自由度振动系统的导纳谱形式与特征,给出了完整桩与各种缺损桩的导纳振幅谱判断依据及计算处理方法,为导纳谱法在实际中的更好应用提供了理论说明。 相似文献
967.
阳极焙烧炉的燃烧计算与分析 总被引:1,自引:1,他引:0
采用计算燃烧学的原理和模型以及CFD软件对以重油作为燃料的阳极焙烧炉炉内的流动、燃烧过程进行了模拟计算,讨论了炉内温度场、流场和各组分浓度场的分布规律,分析了这些因素对碳阳极焙烧质量的影响.研究表明,在设计阳极焙烧炉结构时应考虑火道中挡板对气流分布的影响. 相似文献
968.
969.
1 Introduction From July 10th to September 26, 2003,“Xuelong”scientific expedition icebreaker executed the 2nd Chinese Arctic Research Expedition (CHINARE2003). The voyage star- ted from Shanghai to Dalian via Yellow Sea and Bo Hai and the cruising rout… 相似文献
970.
本文简要介绍了包括三部分观测的安徽淮南长期野外试验观测站,特别是土壤-植被-大气的集中观测,对小塔运行前三个月(2018年6月至8月)的数据,并结合同一时段大塔获得的数据,进行了初步分析.结果表明这些资料有合理的变化特征,日变化和夏季值特征显著,各月份间气象变化有明显差异.土壤水分和温度受降雨影响,在不同的下垫面条件下表现出不同的变化.土壤CO2日平均浓度在2 cm和10 cm处分别为1726和4481 ppm.2018年夏季土壤CO2浓度随土壤体积含水量的变化而变化,但与土壤温度呈弱相关. 相似文献