全文获取类型
收费全文 | 69篇 |
免费 | 3篇 |
国内免费 | 26篇 |
专业分类
化学 | 79篇 |
晶体学 | 1篇 |
力学 | 11篇 |
物理学 | 7篇 |
出版年
2023年 | 3篇 |
2022年 | 2篇 |
2021年 | 3篇 |
2020年 | 4篇 |
2019年 | 1篇 |
2018年 | 3篇 |
2017年 | 2篇 |
2016年 | 1篇 |
2015年 | 3篇 |
2014年 | 5篇 |
2013年 | 7篇 |
2012年 | 5篇 |
2011年 | 8篇 |
2010年 | 4篇 |
2009年 | 3篇 |
2008年 | 1篇 |
2007年 | 2篇 |
2006年 | 4篇 |
2005年 | 1篇 |
2004年 | 4篇 |
2003年 | 1篇 |
2002年 | 3篇 |
2001年 | 1篇 |
2000年 | 6篇 |
1999年 | 2篇 |
1998年 | 1篇 |
1996年 | 1篇 |
1995年 | 2篇 |
1994年 | 2篇 |
1993年 | 3篇 |
1992年 | 3篇 |
1991年 | 2篇 |
1987年 | 2篇 |
1986年 | 1篇 |
1985年 | 2篇 |
排序方式: 共有98条查询结果,搜索用时 15 毫秒
81.
We propose a general formulation for nonisothermal multiphase flow of brine and gas through saline media. The balance equations include mass balance (three species), equilibrium of stresses and energy balance (total internal energy). Salt, water and air mass balance equations are established. The balance of salt allows the establishment of the equation for porosity evolution due to solid skeleton deformation, dissolution/precipitation of salt and migration of brine inclusions. Water and air mass balance equations are also obtained. Two equations are required for water: total water in the medium and water present in solid phase brine inclusions. The mechanical problem is formulated through the equation of stress equilibrium. Finally, the balance of internal energy is established assuming thermal equilibrium between phases. Some general aspects of the constitutive theory are also presented. 相似文献
82.
Masaaki Musashi Takao Oi Rob Kreulen 《Isotopes in environmental and health studies》2013,49(2):285-299
We report chlorine stable isotopic compositions (δ37Cl, expressed in ‰ relative to the standard mean ocean chloride) as well as δ2H and δ18O values of deep saline fluids taken at eight drill-holes reaching from 73 to 780?m below sea level in the Ibusuki coastal geothermal region, Japan. Analytical results show that the δ37Cl values narrowly range between ?0.26 and +0.21?‰ with an analytical precision of ±0.06?‰. Except for one sample, the samples examined are negative in δ37Cl value with varying Cl/B molar ratios from 117 to 1265. A correlation study between the Cl/B molar ratio and the δ37Cl/δ11B ratio indicates a hyperbola-type mixing of at least two Cl sources in the Ibusuki region. One of them depletes in 37Cl with a higher value of Cl/B molar ratio; and the other one enriches in 37Cl with a lower Cl/B molar ratio. The former is chemically identical to that of the deep brine, which is altered seawater through the seawater–hot rock interaction. The latter is chemically similar to gas condensate derived from the high-temperature (890?°C) vent of an island-arc volcano near the Ibusuki region. 相似文献
83.
Tamer N. Azouggaghoualen M. D. Atbir A. Mançour-Billah S. El Hadek M. 《Journal of Thermal Analysis and Calorimetry》2004,77(3):789-801
Desalination of sea-water was investigated. Effluent of desalination plant was evaporated in isotherm and isobar condition.
Density, electric conductivity measurements and chemical analysis were carried out during the process. The results characterising
the crystalline phase provide the fields and limits of the precipitation and separation.
This revised version was published online in August 2006 with corrections to the Cover Date. 相似文献
84.
Sheng-Tao Fang Na-Na Kong Bing-Fei Yan Cui-Yun Yang Jian-Hua Wang Su-Jing Liu 《Natural product research》2016,30(24):2856-2860
Phytochemical investigation of the fruits of Vitex negundo var. cannabifolia led to the isolation of 22 compounds (1–22). Their structures were elucidated mainly by spectroscopic analysis and comparison with the literature data. Among them, compounds 1 and 2 were two new artificial lignans. Primary bioassay showed that the polymethoxyflavones 9–12 displayed moderate-to-weak cytotoxicity against human HepG2 and rat C6 cell lines, while the triterpenoids 13–17 exhibited significant brine shrimp lethality with LC50values of 7.5–29.4 μM. 相似文献
85.
Krzysztof Drwal Zuzanna Górska Patrycja Bończak Beata Krasnodębska-Ostręga 《Electroanalysis》2023,35(5):e202200397
The stripping voltammetry at HMDE is proposed for Cd and Pb (undesirable ingredients) determination in the natural brine (CCl >43 g L−1). Samples with so high salinity have to be significantly diluted. For ICP MS, a 105–6 times dilution is required, which disqualifies this method. The proposed procedure allows to determine Cd (0.001 μg L−1) and Pb (0.005 μg L−1) after only 100 times dilution. The thermal chloride stripping or isolation by Chelex 100 increase the quality of obtained data. The recovery study was performed. The LOQs are below recommendations related to the use of brines in balneology. 相似文献
86.
离子色谱法测定饱和卤水中痕量碘离子 总被引:1,自引:0,他引:1
建立了一种在线样品预处理、脉冲安培检测饱和卤水中痕量I-的离子色谱新方法。进样体积为50μL,选用Cryptand C1浓缩柱富集I-,并用10 mmol/L NaOH洗脱样品中的基体Cl-。用0.5 mmol/L NaOH将I-从浓缩柱转移到保护柱柱端。用IonPac AS20阴离子交换柱,25 mmol/L NaOH淋洗分离,结合脉冲安培银工作电极检测。I-检出限为0.07μg/L(3倍基线噪音);I-在5~1000μg/L范围内具有良好的线性关系(r=0.9995)。50μg/L的I-溶液连续进样9次,峰高相对标准偏差(RSD)为1.0%。 相似文献
87.
88.
盐湖卤水蒸发浓缩过程中pH值变化规律研究 总被引:2,自引:0,他引:2
实验测定了当雄错、一里坪和多格错仁3个盐湖卤水蒸发浓缩过程中pH值,结果发现卤水浓缩过程中pH值表现趋酸向变化或越碱向变化规律;卤水中氯化钠、硫酸钠和水等大量中性成分随浓缩进行不断减少,则强酸弱碱盐或强碱弱酸盐在体系中所占比例越来越大,其水解推动pH值规律性变化;上述3个盐湖卤水浓缩时pH值变化试验数据反映的规律表明,据卤水化学组成配盐结果,可预先判断浓缩过程中pH值变化趋向;氯化物型和硫酸镁亚型盐湖卤水蒸发浓缩时pH值表现逐渐下降的规律,碱金属的碳酸盐或硼酸盐占较大比例的盐湖卤水蒸发浓缩时pH值表现逐渐上升规律;卤水浓缩过程中pH值变化规律对盐湖资源开发研究具有指导作用。 相似文献
89.
90.
FaQiangLI BaoPingLING PeiHuaMA 《中国化学快报》2004,15(11):1353-1356
A novel method for removing boron with ion exchange resin from residual brines tomanufacture boron-free magnesia is described. The concentration of boron in the target magnesiamanufactured thereby from Qinghai salt lakes is lower than 5 μg/g, and the typical D50 size ofproduct is 10.625 μm. 相似文献