全文获取类型
收费全文 | 69篇 |
免费 | 3篇 |
国内免费 | 11篇 |
专业分类
化学 | 32篇 |
力学 | 18篇 |
综合类 | 4篇 |
数学 | 5篇 |
物理学 | 24篇 |
出版年
2021年 | 2篇 |
2020年 | 3篇 |
2019年 | 3篇 |
2018年 | 2篇 |
2017年 | 2篇 |
2016年 | 3篇 |
2015年 | 1篇 |
2014年 | 4篇 |
2013年 | 2篇 |
2012年 | 6篇 |
2011年 | 10篇 |
2010年 | 4篇 |
2009年 | 7篇 |
2008年 | 6篇 |
2007年 | 4篇 |
2006年 | 4篇 |
2005年 | 2篇 |
2004年 | 2篇 |
2003年 | 1篇 |
2002年 | 1篇 |
2001年 | 2篇 |
2000年 | 1篇 |
1999年 | 1篇 |
1998年 | 2篇 |
1997年 | 1篇 |
1996年 | 2篇 |
1995年 | 1篇 |
1993年 | 2篇 |
1992年 | 1篇 |
1988年 | 1篇 |
排序方式: 共有83条查询结果,搜索用时 15 毫秒
1.
Xinchun He Wenwen Lv Xiaomeng Shi Hao Wei Min Shi Feijun Wang 《Tetrahedron letters》2018,59(11):1038-1041
Phosphonylation of the pretreated 2-(hydroxymethyl)phenol derivatives with acetic anhydride using trialkylphosphites as the nucleophilic reagents was reported, providing a practical way to the synthesis of novel highly steric 3,3′-bis-substituted benzo[d][1,2]oxaphosphole 2-oxides. 相似文献
2.
Xufeng Dong Jinping Ou Xinchun Guan 《Journal of magnetism and magnetic materials》2010,322(22):3648-3652
Magnetostrictive properties have relationship with the applied orientation field during the preparation of giant magnetostrictive composites. To understand the dependence of the optimal orientation field on particle volume fraction, composites with 20%, 30% and 50% particles by volume were fabricated by distributing Terfenol-D particles in an unsaturated polyester resin under various orientation fields. Their magnetostrictive properties were tested without pre-stress at room temperature. The results indicate that as the particle volume fraction increases, the optimal orientation field increases. The main reason for this phenomenon is the packing density for the composites with higher particle volume fraction is larger than that for those with lower particle content. 相似文献
3.
To overcome the complicated and time-consuming difficulties of current models, a new lubrication equation based on boundary velocity slip model for solving the ultra-thin film gas lubrication in hard disk drives is proposed by adopting the nanoscale effect function, N p. The present model is easy to calculate and applicable at nanoscale. The results of numerical calculations indicate that the present model produces a close approximation to that of the exact Boltzmann model. 相似文献
4.
介绍了采用X射线光电子谱(XPS)等技术研究脉冲激光沉积在Ni、Mo、C、NaCl(100)表面的Cu、Au原子团簇的电子状态;结合Cu2p3/2 X射线光电子谱峰和Cu L3M4,5M4,5俄歇跃迁分离了电子结合能的初态和终态贡献,得出了它们随Cu表面浓度变化的关系,并对之作出了解释。使用XPS、RBS、TEM三项技术研究了Au在NaCl(100)表面的生长过程,通过计算得出了在不同表面浓度下Au原子团簇的平均高度和表面覆盖率。 相似文献
5.
Xinchun Li Jianbin Pan Fan Yang Jun Feng Jinyuan Mo Zuanguang Chen 《Mikrochimica acta》2011,174(1-2):123-130
We report on a simple amperometric detector for use in microchip capillary electrophoresis. A disposable syringe serves as the electrode holder that is fixed at the outlet of the separation channel. A carbon paste electrode is used to detect dopamine (DA) and catechol (CA) after electrophoretic separation. The two model analytes were well separated within 60 s. The response is linear in the concentration range from 4 to 500???M, and the detection limit is 1.2???M for DA (S/N = 3:1). The relative standard deviations of the inter-run and inter-electrode peak currents, respectively, are 2.8% and 5.7% for DA, and 3.9% and 6.5% for CA. Favorable column efficiency (expressed by the theoretical plate number which is 5.3 × 104 m-1 for DA) is achieved. The method was successfully applied to the separation and detection of 3-aminophenol (3-AP) in an injection powder containing sodium 4-aminosalicylate. The detection limit of 3-AP is as low as 1.7???M, which meets the demand of the impurity test. The facile assembly allows convenient replacement of working electrodes and improves the longevity of the microanalytical system. Figure
Voltammetric behaviors of 3-AP and 4-AS at carbon paste electrode (CPE), and microchip electrophoresis-amperometry with CPE for the two analytes. 相似文献
6.
小功率空气冷却ICP-AES 研究I——小功率空气冷却ICP的特性 总被引:1,自引:1,他引:1
本文用顺序等离子体光谱仪研究了27.12MHz他激式R.F.发生器点燃的小功率空气冷却ICP的特性。测量并比较了二十个元素五十七条谱线在空气冷却和氩冷却两种ICP中的检测限。 相似文献
7.
8.
Controllable synthesis and characterization of ammonium polyphosphate with crystalline form V by phosphoric acid process 总被引:2,自引:0,他引:2
Gousheng Liu Wenyan Chen Xinchun Liu Jianguo Yu 《Polymer Degradation and Stability》2010,95(9):1834-12155
Ammonium polyphosphate (APP) with crystalline form V (APP-V) was synthesized by heating a mixture of 85% food-grade phosphoric acid and melamine under dry ammonia atmosphere. Effects such as raw material ratios, charging methods, dehydration temperature, condensation temperature and condensation time were investigated. Its water solubility was tested, its XRD and FTIR were characterized and compared with those of industrial APP-I and APP-II. Results showed that the prepared APP-V was insoluble in water, its XRD spectrum was the same as APP-V in literature. The molecular structures of the prepared APP-V and APP-I/APP-II were speculated and discussed in detail. 相似文献
9.
采用免疫化学方法,以胸苷激酶(TK)抗体检测了5种培养的细胞(4种癌细胞和1种正常细胞)及12种人类癌组织切片.结果表明,正常细胞呈阴性结果,4种癌细胞及12种癌组织均呈阳性结果.提示此种方法在癌症的临床诊断方面可能有意义. 相似文献
10.