全文获取类型
收费全文 | 1951篇 |
免费 | 223篇 |
国内免费 | 998篇 |
专业分类
测绘学 | 41篇 |
大气科学 | 37篇 |
地球物理 | 422篇 |
地质学 | 1907篇 |
海洋学 | 282篇 |
天文学 | 339篇 |
综合类 | 58篇 |
自然地理 | 86篇 |
出版年
2024年 | 10篇 |
2023年 | 20篇 |
2022年 | 60篇 |
2021年 | 77篇 |
2020年 | 93篇 |
2019年 | 101篇 |
2018年 | 38篇 |
2017年 | 59篇 |
2016年 | 89篇 |
2015年 | 94篇 |
2014年 | 122篇 |
2013年 | 82篇 |
2012年 | 119篇 |
2011年 | 188篇 |
2010年 | 151篇 |
2009年 | 168篇 |
2008年 | 170篇 |
2007年 | 183篇 |
2006年 | 168篇 |
2005年 | 156篇 |
2004年 | 137篇 |
2003年 | 102篇 |
2002年 | 97篇 |
2001年 | 94篇 |
2000年 | 91篇 |
1999年 | 75篇 |
1998年 | 50篇 |
1997年 | 54篇 |
1996年 | 52篇 |
1995年 | 41篇 |
1994年 | 44篇 |
1993年 | 38篇 |
1992年 | 43篇 |
1991年 | 31篇 |
1990年 | 18篇 |
1989年 | 15篇 |
1988年 | 11篇 |
1987年 | 6篇 |
1986年 | 14篇 |
1985年 | 5篇 |
1984年 | 1篇 |
1983年 | 1篇 |
1982年 | 2篇 |
1981年 | 1篇 |
1978年 | 1篇 |
排序方式: 共有3172条查询结果,搜索用时 15 毫秒
191.
Geotechnical properties of a chemically stabilized soil from Malaysia with rice husk ash as an additive 总被引:1,自引:0,他引:1
Summary The stabilization of Malaysian soil by mixing with rice husk ash, a locally available waste material, to improve its engineering properties is described. Stabilizing agents, i.e. cement and lime, were added to produce the reaction products which are responsible for the enhancement of the engineering properties. Based on the strength development, it seems that lime is the more effective stabilizing agent. However, the cheap waste material can be used as partial replacement for the more expensive cement in the cement-treatment of the soil. A durability study was carried out to evaluate the effectiveness of this stabilization method. 相似文献
192.
作者对激光热透镜光谱法测定微量钼进行了研究.试验表明,在丙酮介质中,Mo6+能被还原成Mo5+并形成钼蓝同多酸,最大吸收彼长在670um处,利用He-Ne激光器输出的632.8um的激光作光源,进行微量钼的热透镜法分析测定.两酮的存在能增强热透镜信号强度。钼含量在0.01—2.0μg/mL范围内与激光热透镜信号强度呈良好的线性关系,方法检出限为0.005μg/mL钼,已用于地质样品中微量钼的高灵敏度测定.结果满意. 相似文献
193.
194.
应用放射性同位素x射线荧光分析仪测定各种元素含量在许多文献中均有报道。本文主要介绍84A86型轻便x射线荧光分析仪首次在福建省紫金山铜矿区测定粉末样、块状岩心、坑道壁中铜矿的含量及其所取得的经济效益。 相似文献
195.
研究表明,在H3PO4介质中,丁基罗丹明B可从乙酸异戊酯有机相中的[T1Br4]^--结晶紫缔合物中置换结晶紫而形成新的离子缔合三元荧光络合物。详细考察了该络合物形成的最佳条件、荧光特征及萃取溶剂等,制定了地球化学样品中痕量T1的荧光光度测定新方法,其检出限0.005μg/ml.T1量在0-0.5μg/ml范围与荧光强度呈正比。测定了含T1量0.61-1.9μg/g的8个一级地球化学标样,结果相符 相似文献
196.
S. C.?Tarantino M.?ZemaEmail author M.?Pistorino M. C.?Domeneghetti 《Physics and Chemistry of Minerals》2003,30(10):590-598
Structural investigations at high temperature were carried out on natural columbite samples across the join Fe(Nb0.95Ta0.05)2O6–Mn(Nb0.95Ta0.05)2O6. The samples were preliminarily annealed to attain the complete cation-ordered state and avoid the superimposition of the effects of cation ordering during high-temperature studies. Unit-cell parameters of three columbites with different XFe content were measured at regular intervals in the temperature range 25–900 °C using single-crystal X-ray diffraction techniques. The crystal structures of completely ordered ferrocolumbite and manganocolumbite were also refined from intensity data collected at room temperature, 300 and 600 °C. Structural thermal expansion coefficients show positive, linear expansion of a, b, c lattice constants and cell volume. In general, slightly higher expansion occurs along a and c directions. However, anisotropy decreases sharply with decreasing Fe content. Reversibility of thermal expansion in the investigated temperature range was checked by high-temperature diffraction studies under heating-up and cooling-down conditions. Impurities do not play an important role in thermal expansion of columbites; expansion coefficients measured on two crystals of the same sample characterized by different Ti content are in fact almost identical. Structural changes with temperature essentially affect bond lengths: volumes of both A and B octahedral sites increase linearly with temperature, whereas interpolyhedral geometrical parameters do not vary significantly. 相似文献
197.
X射线荧光光谱分析检出限问题的探讨与建议 总被引:12,自引:5,他引:7
对有关X射线荧光光谱分析低含量元素的检出限问题进行了多方面的探讨。从检出限的定义及其定义下的相对标准偏差到各种不同测量、校准与校正方法的检出限及其相对应的相对标准偏差进行计算。提出了以定义检出限的相对标准偏差为基准,对各种测量方法计算出的检出限进行重新界定,从而确认一个具有可比性的、精度一致的检出限。同时还讨论了仪器与X光管固有杂质元素谱线对该元素检出限的影响;测量仪器、测量条件与测量时间对检出限的影响;不同岩性试样对检出限的影响;检出限与测定限等问题。 相似文献
198.
Laser ablation inductively coupled plasma mass spectrometry (LA-ICP-MS) has been applied to determine the elemental composition of the surface layer, as well as of the first interior layer, of quartz grains from the mine tailings from Kristineberg (northern Sweden) in order to determine concentration gradients between these two layers. The quartz grains were collected from the oxidized and unoxidized zones within the tailings. The aim of this study is to assess the role of quartz surfaces as sites for the attenuation of solutes from the mine-tailings porewater. Concentrations of Cu, Ag, Sb, Pb and Bi are highest near the surface of each grain and decrease towards the interior. The surface concentration of Cu, Zn and Pb is more pronounced within the unoxidized than within the oxidized zone of the tailings. Cu exhibits a distinct concentration peak at the surface of the quartz grains below the pre-remediation oxidation front. For Zn and Ce the trend of high surface concentration is less pronounced than for Cu or Pb. Silver, Bi and As are preferably adsorbed within the uppermost layers of the oxidized zone where the pH is as high as 6.2. The conversion of intensity signals of the elements to concentration values in ppm was done by using external standards (NIST silicate glass). 相似文献
199.
Webster Cash 《Experimental Astronomy》2003,16(2):91-136
For the astronomer, X-ray interferometry is the theory and practice of building dilute aperture telescopes for studying celestial X-ray sources. The short wavelengths and high surface brightness of X-ray sources will make the eventual scientific payoff very high, with direct imaging of the event horizons of black holes as the centerpiece. In this article, we review the history of X-ray interferometry and discuss the recent technical developments toward astronomical applications. We present several mission concepts and show they are achievable with todays technology. 相似文献
200.
YU Wen-fei 《天文研究与技术》2003,(1):12-15
最近对低质量X射线双星中的千赫兹准周期振动的研究表明 ,是辐射压力 ,而不是盘和磁球的相互作用以及处于盘内边界的广义相对论效应在短时标的盘切断机制上起作用。本文给出了一些研究结果及讨论。 相似文献