全文获取类型
收费全文 | 2369篇 |
免费 | 406篇 |
国内免费 | 590篇 |
专业分类
测绘学 | 106篇 |
大气科学 | 473篇 |
地球物理 | 576篇 |
地质学 | 1238篇 |
海洋学 | 265篇 |
天文学 | 160篇 |
综合类 | 244篇 |
自然地理 | 303篇 |
出版年
2024年 | 6篇 |
2023年 | 57篇 |
2022年 | 139篇 |
2021年 | 150篇 |
2020年 | 94篇 |
2019年 | 124篇 |
2018年 | 168篇 |
2017年 | 137篇 |
2016年 | 160篇 |
2015年 | 117篇 |
2014年 | 154篇 |
2013年 | 139篇 |
2012年 | 115篇 |
2011年 | 128篇 |
2010年 | 146篇 |
2009年 | 115篇 |
2008年 | 106篇 |
2007年 | 87篇 |
2006年 | 72篇 |
2005年 | 73篇 |
2004年 | 39篇 |
2003年 | 61篇 |
2002年 | 48篇 |
2001年 | 45篇 |
2000年 | 72篇 |
1999年 | 113篇 |
1998年 | 92篇 |
1997年 | 90篇 |
1996年 | 89篇 |
1995年 | 97篇 |
1994年 | 66篇 |
1993年 | 62篇 |
1992年 | 44篇 |
1991年 | 30篇 |
1990年 | 24篇 |
1989年 | 25篇 |
1988年 | 21篇 |
1987年 | 13篇 |
1986年 | 12篇 |
1985年 | 9篇 |
1984年 | 5篇 |
1983年 | 9篇 |
1982年 | 5篇 |
1981年 | 2篇 |
1980年 | 1篇 |
1979年 | 1篇 |
1976年 | 1篇 |
1958年 | 2篇 |
排序方式: 共有3365条查询结果,搜索用时 0 毫秒
51.
We introduce a new code for cosmological simulations, PHo To Ns, which incorporates features for performing massive cosmological simulations on heterogeneous high performance computer(HPC) systems and threads oriented programming. PHo To Ns adopts a hybrid scheme to compute gravitational force, with the conventional Particle-Mesh(PM) algorithm to compute the long-range force,the Tree algorithm to compute the short range force and the direct summation Particle-Particle(PP) algorithm to compute gravity from very close particles. A self-similar space filling a Peano-Hilbert curve is used to decompose the computing domain. Threads programming is advantageously used to more flexibly manage the domain communication, PM calculation and synchronization, as well as Dual Tree Traversal on the CPU+MIC platform. PHo To Ns scales well and efficiency of the PP kernel achieves68.6% of peak performance on MIC and 74.4% on CPU platforms. We also test the accuracy of the code against the much used Gadget-2 in the community and found excellent agreement. 相似文献
52.
Hao-Yi Wan Shu-Lei Cao Huan-Yu Teng Yu Liu Jian-Chen Zhang Tong-Jie Zhang 《天文和天体物理学研究(英文版)》2018,(10)
In order to explore the properties of cosmic neutrinos, i.e. sum of the neutrino mass(∑m_ν) and the effective number of neutrino species(N_(eff)), which affects the Hubble expansion rate H(z)and the power of observational Hubble parameter data(OHD) in constraining cosmological parameters under the ΛCDM model, we utilize OHD to constrain the properties of cosmic neutrinos and apply an accurate H(z) function with mνand Neff. First, we simulate new OHD beyond the existing 43 OHD. According to the predictions of measurements of H_0(the current H(z) value), baryon acoustic oscillations(BAO) peaks, Sandage-Loeb(SL) test and cosmic microwave background(CMB), we assume observational accuracy up to 2% and redshift 0 z ≤5. With simulated H(z) data obtained from the fiducial model, we constrain the parameters including mνand Neff. When all parameters are set free, mν 0.196 eV(95%) and N_(eff)= 2.984 ± 0.826(68%) are obtained, and when fixing Neff as the standard baseline 3.046, we attain ∑m_ν 0.240 eV(95%). These constrained results are much tighter than the ones obtained by the current OHD, which makes the prospect of OHD in constraining cosmological parameters more promising as its accuracy and quantity grow. 相似文献
53.
54.
介绍了一种高精度、高性价比的GPS定位定向仪的设计及实现(〈1mil,2σ)方法,系统利用了实际应用中的有利约束条件,对基于LAMBDA方法的载波相位整周模糊度解算算法进行了改进,经过系统工程设计,在实际应用中实现了单频、高精度、快速定向数据的输出。可以满足绝大多数环境下的使用需求,大大降低了系统成本。 相似文献
55.
通过对常规观测资料、自动站资料、GMS-5卫星云图和多普勒雷达等气象资料分析发现, 2001年8月热带低压在福建北部登陆, 途经江苏无锡、常熟时, 其南侧西南气流与沪浙沿海的东南风形成切变线。受源源不断地水汽输送和切变线动力抬升作用, 热带低压南侧不断产生β-中尺度强对流回波带, 它们形成后随热带低压气旋性环流向东移动, 在上海城区附近辐合形成β-中尺度强对流回波群, 在卫星云图上呈现出以此为核心的中尺度对流辐合体 (MCC)。分析表明, 受水汽凝结、潜热释放这种正反馈机制作用, 在热带低压东南侧大尺度切变线中段北侧派生出一个独立、完整的近地面β-中尺度的气旋性环流, 它就是MCC的内核, 直接造成了上海“ 0185”特大暴雨的发生。 相似文献
56.
Darcys Law Expressed by Chemical Index 总被引:3,自引:0,他引:3
Hu Kuanrong Cao Yuqing Zhang Wenbing Hu Zhongyi Department of Hydrogeology Engineering Geology Changchun University of Science Technology Changchun 《中国地质大学学报(英文版)》2000,11(4)
In 18 5 6 ,HenryDarcypublishedhislaw ,theDarcy’slaw ,expressedbyhydraulicindexthroughalong termexperimentofwaterpermeationinmulti mineralmedium (Xu ,1986 ) ,whichnotonlymettheurgentneedofthedevelopmentofsocialecono myandpracticeforcalculationofwellwaterquantityatt… 相似文献
57.
西昌市地质灾害发育分布规律及防灾建议 总被引:1,自引:0,他引:1
西昌市地处川西的安宁河流域,区内地质条环境件复杂,生态环境脆弱,泥石流、滑坡等地质灾害发育,给当地居民生命财产安全及经济发展带来了较大影响。本文通过对西昌市目前发育的153处不同类型的地质灾害进行统计,总结了地质灾害在流域、高程、时段等方面的分布规律;对影响或控制西昌市地质灾害发育的地形地貌、构造、岩土体结构、地震、降雨及人类工程活动等因素进行了分析、总结;并针对西昌市的地质灾害类型及发育分布特征提出了适用于该地区的科学、合理的地质灾害防灾建议。 相似文献
58.
The research on diagenesis of clastic-rock reservoir is developing rapidly in recent ten years. Thus, it is of great significance in academic and scientific exploration to summarize the domestic and international research progress and the key issues of frontier research on diagenesis. The research progress, main achievement and recognition in diagenesis of clastic-rock reservoirs in recent years is discussed, and the hot issues or developing trend of diagenesis in the future is probed in this paper, on the basis of summarizing the previous research results and understanding, combined with the typical research examples at home and abroad. It is believed that great progress was obtained in provenance and parent rock constraints on sandstone types and their diagenetic evolution pathways, impact of fluid-rock interaction and its product on diagenesis, influence of thermodynamics and overpressure background on diagenesis and pore development, the timing sequence between hydrocarbon accumulation and filling process and the sandstone reservoir becoming low permeability-densification. At present, diagenetic research is developing in direction of the spatial and temporal dynamics and quantitative evolution mechanistic and diagenetic system controlled by the basin fluid dynamics, thermal dynamic processes, combining the micro-scale diagenesis research with the basin macroscopic background such as sedimentation from the source to the basin, burial history, hydrocarbon maturity and charge into reservoirs, tectonic evolution and fluid activity, and fluid and rock interaction.The aim of this paper is to induce the academic peers and experts in diagenesis and the related research fields to come forward with their valuable contributions, to cooperate and work together and joint efforts on the research exquisite, profundity and breadth of diagenesis, and application of the most advanced analytical measurement techniques and methods, as well as integration and infiltration of multidisciplinary, in order to promote the course of the clastic-rock reservoir diagenetic research in China. 相似文献
59.
60.
气候观测环境代表性和观测资料质量是开展大尺度气候变化监测和研究的前提。为了解我国干燥区气象观测环境变化和台站代表性,作者对河西走廊和北疆九个国家级气象站观测环境开展了调研。本文介绍了调研了解到的情况,并结合先前研究结果,从气候变化监测和研究的视角,讨论了西北干燥区地面观测站代表性问题。目前我国西北地区气象站地面观测,对于干燥区的城市和绿洲区域气候及其变化,具有较高的代表性,但对更广大的荒漠和半荒漠背景气候及其变化,代表性仍显不足。作者发现,早先研究中指出的北疆等地区城镇站地面气温序列负向城市化影响,应与观测场周围局地甚至区域尺度绿洲扩大有直接联系,较难反映绿洲以外干燥区地带性气温变化。针对地面观测环境调研所发现的问题,文章最后提出了几点建议,希望对未来国家基准气候站网设计和建设提供一定参考。 相似文献