全文获取类型
收费全文 | 1024篇 |
免费 | 285篇 |
国内免费 | 177篇 |
专业分类
测绘学 | 81篇 |
大气科学 | 36篇 |
地球物理 | 374篇 |
地质学 | 691篇 |
海洋学 | 149篇 |
天文学 | 17篇 |
综合类 | 58篇 |
自然地理 | 80篇 |
出版年
2024年 | 3篇 |
2023年 | 14篇 |
2022年 | 30篇 |
2021年 | 29篇 |
2020年 | 30篇 |
2019年 | 45篇 |
2018年 | 39篇 |
2017年 | 56篇 |
2016年 | 62篇 |
2015年 | 63篇 |
2014年 | 69篇 |
2013年 | 58篇 |
2012年 | 72篇 |
2011年 | 89篇 |
2010年 | 62篇 |
2009年 | 61篇 |
2008年 | 62篇 |
2007年 | 62篇 |
2006年 | 70篇 |
2005年 | 59篇 |
2004年 | 69篇 |
2003年 | 39篇 |
2002年 | 37篇 |
2001年 | 34篇 |
2000年 | 31篇 |
1999年 | 39篇 |
1998年 | 37篇 |
1997年 | 32篇 |
1996年 | 31篇 |
1995年 | 19篇 |
1994年 | 18篇 |
1993年 | 23篇 |
1992年 | 11篇 |
1991年 | 6篇 |
1990年 | 6篇 |
1989年 | 6篇 |
1988年 | 4篇 |
1987年 | 2篇 |
1986年 | 2篇 |
1985年 | 1篇 |
1984年 | 1篇 |
1980年 | 1篇 |
1978年 | 1篇 |
1954年 | 1篇 |
排序方式: 共有1486条查询结果,搜索用时 46 毫秒
151.
对3种室内可见光通信传输技术的数字信号处理方法(DSP),包括正交频分复用(OFDM)、单载波频域均衡(SCFDE)与单载波频分复用(SCFDM)进行了对比分析.通过峰值功率比(PAPR)和计算复杂度比较了3种方法的优劣.分析结果表明,SCFDE和SCFDM具有较低的PAPR,但SCFDM计算复杂度较高.此外,还使用白光LED灯针对3种调制解调方法建立了实验模型.实验结果表明,在VLC传输系统中,由于低PAPR特性,使得SCFDE和SCFDM在误码率(BER)和Q值方面的性能优于OFDM. 相似文献
152.
Nancy Perry 《Urban geography》2016,37(1):141-161
This study examines the eminent domain action in 1942 where the federal government took 411 acres of land, including an African American neighborhood, to construct the Pentagon building in Arlington County, Virginia. The Fifth Amendment of the U.S. Constitution acknowledges the right of the federal government to exercise eminent domain where needed for the common good, but requires that property owners be given just compensation. This study explores the issue of compensation: what the residents lost when they were forced to move, how that loss was compensated, and whether the compensation was “just.” The study data include interviews with former residents of the neighborhood, oral histories, land records, census data, photographs, and newspaper articles. The study concludes that the federal government compensated the residents for land and buildings, but was unable to compensate for a lost community. For many residents, that community is mourned even 72 years later. 相似文献
153.
本文介绍了球谐合成和分析问题的数值计算原理,研究分析了其内在的并行性,提出了区域划分和聚合通信的并行计算策略。基于傅立叶变换技术,应用MPI(消息传递接口)并行编程模式,实现了球谐分析及合成计算的并行化。实验结果表明,较之串行实现,并行实现大大缩短了计算时间,获得了近似线形加速比,取得很高的并行效率。 相似文献
154.
Thomas Jenkin 《The Australian geographer》1999,30(3):355-371
The exploitation of natural resources within areas that are valued for their environmental qualities raises competing emotions. This paper considers a proposal to undertake petroleum exploration in an area of recognised environmental value, namely, the Coongie Lakes of far north-east South Australia. In development cases such as this, the level of inquiry needs to address environmental, social, cultural and economic issues from a range of interest groups; therefore, the process of assessment is a crucial factor in minimising conflict and meeting the wishes of the stakeholders. In the example of Coongie Lakes, the chosen method failed. This paper discusses the perspectives of the major stakeholders, the process of assessment undertaken, and the criticisms directed at this process. The apparent inadequacies of the assessment process undertaken are then highlighted, and an alternative assessment procedure suggested. 相似文献
155.
156.
低水位体系域在层序地层中是一种很重要的海退式层序单元,沉积作用颇具特色,它是指示地层划分与对比,岩相,构造古地理,板块活动的良好标志。 相似文献
157.
Modelling of pile wave barriers by effective trenches and their screening effectiveness 总被引:2,自引:0,他引:2
The three-dimensional problem of isolation of vibration by a row of piles is studied numerically on the basis of a model replacing the row of piles by an effective trench in order to reduce the modelling complexity. The analysis is accomplished with the aid of an advanced frequency domain boundary element method, which is used for both the infilled trench and the soil medium in conjunction with a coupling procedure based on enforcement of equilibrium and compatibility at the trench–soil interface. Linear elastic or viscoelastic material behaviour is assumed for both the piles and the soil. The piles can be tubular or solid and have circular or square cross-section. The vibration source is a vertical force, harmonically varying with time, and the row of piles acts as a passive wave barrier. The effective trench model is constructed by invoking well known homogenization techniques used in the mechanics of fibre-reinforced composite materials, and its accuracy is compared against a rigorous boundary element analysis modelling each pile separately in full contact with the soil medium. On the basis of the effective trench model, the screening effectiveness of a row of piles is studied through parametric studies. 相似文献
158.
In this paper, a study on the transient response of an elastic structure embedded in a homogeneous, isotropic and linearly elastic half-plane is presented. Transient dynamic and seismic forces are considered in the analysis. The numerical method employed is the coupled Finite-Element–Boundary-Element technique (FE–BE). The finite element method (FEM) is used for discretization of the near field and the boundary element method (BEM) is employed to model the semi-infinite far field. These two methods are coupled through equilibrium and compatibility conditions at the soil–structure interface. Effects of non-zero initial conditions due to the pre-dynamic loads and/or self-weight of the structure are included in the transient boundary element formulation. Hence, it is possible to analyse practical cases (such as dam–foundation systems) involving initial conditions due to the pre-seismic loads such as water pressure and self-weight of the dam. As an application of the proposed formulation, a gravity dam has been analysed and the results for different foundation stiffness are presented. The results of the analysis indicate the importance of including the foundation stiffness and thus the dam–foundation interaction. 相似文献
159.
160.