全文获取类型
收费全文 | 49031篇 |
免费 | 9339篇 |
国内免费 | 11750篇 |
专业分类
测绘学 | 3770篇 |
大气科学 | 11203篇 |
地球物理 | 7361篇 |
地质学 | 23766篇 |
海洋学 | 5698篇 |
天文学 | 8061篇 |
综合类 | 2942篇 |
自然地理 | 7319篇 |
出版年
2024年 | 149篇 |
2023年 | 598篇 |
2022年 | 1564篇 |
2021年 | 1828篇 |
2020年 | 1824篇 |
2019年 | 2063篇 |
2018年 | 1682篇 |
2017年 | 1847篇 |
2016年 | 1895篇 |
2015年 | 2159篇 |
2014年 | 2922篇 |
2013年 | 3075篇 |
2012年 | 3167篇 |
2011年 | 3397篇 |
2010年 | 3064篇 |
2009年 | 3796篇 |
2008年 | 3691篇 |
2007年 | 3796篇 |
2006年 | 3619篇 |
2005年 | 3393篇 |
2004年 | 2911篇 |
2003年 | 2670篇 |
2002年 | 2226篇 |
2001年 | 2008篇 |
2000年 | 1875篇 |
1999年 | 1671篇 |
1998年 | 1447篇 |
1997年 | 1014篇 |
1996年 | 845篇 |
1995年 | 755篇 |
1994年 | 712篇 |
1993年 | 588篇 |
1992年 | 409篇 |
1991年 | 378篇 |
1990年 | 239篇 |
1989年 | 186篇 |
1988年 | 164篇 |
1987年 | 88篇 |
1986年 | 63篇 |
1985年 | 71篇 |
1984年 | 52篇 |
1983年 | 41篇 |
1982年 | 36篇 |
1981年 | 30篇 |
1980年 | 24篇 |
1979年 | 6篇 |
1978年 | 21篇 |
1977年 | 24篇 |
1976年 | 4篇 |
1954年 | 8篇 |
排序方式: 共有10000条查询结果,搜索用时 46 毫秒
991.
Here we report on the different sampling strategies for almost seven years of sampling rocks/sediments for the determination of As within the Intermediate Aquifer System (IAS) and upper Floridan Aquifer System (FAS), a very large and productive limestone aquifer spanning from Georgia into Florida. In the FAS, As contamination has become a recurring problem during aquifer storage and recovery (ASR), particularly in central and south Florida.To investigate these phenomena, samples from solid drill cores and rock cuttings were collected from the Hawthorn Group, Suwannee Limestone, Ocala Limestone and Avon Park Formation. Samples were taken along drill cores and rock cuttings (referred to as ‘interval’ samples) or from particular drill core sections and rock cuttings (referred to as ‘targeted’ samples) likely to contain elevated concentrations of As as indicated by the presence of pyrite, hydrous ferric oxide, organic matter, clay minerals, fracture surfaces, and high permeable (moldic) zones.Arsenic was present in all of the stratigraphic units at low concentrations, close to the global average for As in limestone of 2.6 mg/kg. The highest As concentration was 69 mg/kg. In all units, however, the average bulk As concentration in the targeted samples was substantially higher than that in the interval samples. Based on direct spot measurements by electron microprobe and indirect calculations, pyrite was identified as the main source of As in the FAS. Concentrations in pyrite ranged from less than 100 mg/kg to more than 11,000 mg/kg. Because pyrite is heterogeneously distributed, both vertically and horizontally in the sampled stratigraphic units, the same was observed for the distribution of As. However, As concentrations generally decreased with depth, i.e., highest As values in the Hawthorn Group and lowest As values in the Ocala Limestone and Avon Park Formation. Compared to pyrite, other trace minerals contained much less As.The average As concentrations of the two types of sample media (solid cores and rock cuttings) were quite similar. These results indicate that if simply the average bulk rock As concentration of a geologic unit is the desired outcome of an investigation, either interval or targeted sampling of rock cuttings, seems to be sufficient. This is particularly important when time and money are a factor. This approach could work equally well for any other trace element. Structural sedimentary information, such as fractures, etc., is likely lost, however, when sampling rock cuttings. Thus, if this information is required, solid core samples need to be collected by hollow core diamond drilling. 相似文献
992.
993.
福建云霄晶洞花岗岩及含石榴子石伟晶岩的硅氧同位素研究 总被引:1,自引:0,他引:1
在运用常规方法和激光烧蚀同位素分析方法分别对云霄晶洞花岗岩和伟晶岩(长石、石英和石榴子石)的硅、氧同位素组成进行研究的基础上,探讨了晶涧花岗岩及其含石榴子石伟晶岩的物质来源及形成条件.伟晶岩中的石英和长石的氧、硅同位素组成分别较之花岗岩中的石英和长石的氧、硅同位素组成,均未发生明显变化,表明二者岩浆来源一致.云霄县的乌... 相似文献
994.
995.
作为理解华南构造演化的关键地区,在华南板块南缘的云开地体和越北的Song Chay地体发育了早中生代的向北东逆冲推覆的韧性变形.在云开地体,经历角闪岩相和绿片岩相变质的矿物指示了产状平缓的面理上发育明显的北东-南西向矿物拉伸线理.沿着这些矿物拉伸线理,具有上部指向北东的剪切变形.同位素年代学的定年结果指示了变形事件发生... 相似文献
996.
重磁3D物性反演技术在金属矿勘探中的应用 总被引:1,自引:0,他引:1
解反演问题是地球物理资料处理解释的主要环节.反演就是依据已获得异常特征,结合地质和其他资料,求解地下源体的空间位置、形状及物性特征参数.随着对地质体全方位精细结构研究要求的提高,重磁等反演技术已发展到3D反演阶段.重磁反演主要有两种方法,即形态反演(建立场源模型形态单元)和物性反演(构建物性模型单元).在物性模型构建中... 相似文献
997.
998.
Two independent analytical methods (sequential extraction and kinetic extraction methods) were applied in order to understand the distribution and speciation of La in the coastal and estuarine sediments from the central east coast of India. Sequential extraction study revealed that La was primarily present as inert complexes (~ 50–60% of the total La) in all the sediments. Amounts of ~ 20–30% of the total La in all the sediments were found to associate with the total organic carbon (TOC) in the sediments. The dissociation rate constants of La–sediment complexes obtained from kinetic extraction studies revealed that the concentration of thermodynamically weak complexes of La gradually increased with the increasing La/TOC ratio in the sediments. 相似文献
999.
100MPa、800℃下Mo和W在流体/花岗质熔体相间分配的实验研究 总被引:3,自引:0,他引:3
利用“RQV-快速内冷淬火”(外加热冷封式)高温高压实验装置,在100MPa、800℃条件下,以东秦岭地区出露的高钾钙碱性岩浆岩(合峪花岗岩)为实验初始物,实验研究了Mo和W在花岗岩-H2O、花岗岩-NaCl(KCl)-H2O及花岗岩-NaF-H2O体系流体/熔体相间的分配行为。实验结果表明,Mo比W更倾向于分配进入流体相(DMo^流体/溶体〉〉DW^流体/溶体),相对于纯水体系而言,流体介质中Cl和F的存在均有利于Mo和W向流体相迁移富集,随体系内Cl含量的不断增高,Mo和W的分配系数呈线性增大趋势,而在天然花岗岩可能含有的F含量范围之内,F含量的增高将阻碍Mo、W向流体相迁移,流体介质中Na/K(摩尔比)的变化对Mo和W的分配系数没有明显影响,表明体系碱质(Na或K)类型不是Mo和W在流体/熔体相间分配的主要影响因素。 相似文献
1000.
滇西北衙金多金属矿床成矿地球化学特征 总被引:10,自引:0,他引:10
北衙金多金属矿床是金沙江-哀牢山-红河断裂带与新生代富碱斑岩有关的斑岩型矿床之一.本文重点提供了流体包裹体中稀土微量元素和矿石S、Pb同位素分析结果,并对成矿流体及成矿物质来源等问题进行了讨论.研究表明,本区流体包裹体稀土总量较低,∑REE介于5.19×10-6~9.0×10-6之间,反映轻重稀土分馏程度的∑LREE/... 相似文献