全文获取类型
收费全文 | 353篇 |
免费 | 10篇 |
专业分类
化学 | 230篇 |
晶体学 | 17篇 |
力学 | 18篇 |
数学 | 9篇 |
物理学 | 89篇 |
出版年
2023年 | 2篇 |
2022年 | 15篇 |
2021年 | 7篇 |
2020年 | 14篇 |
2019年 | 7篇 |
2018年 | 9篇 |
2017年 | 6篇 |
2016年 | 6篇 |
2015年 | 12篇 |
2014年 | 15篇 |
2013年 | 26篇 |
2012年 | 28篇 |
2011年 | 39篇 |
2010年 | 22篇 |
2009年 | 24篇 |
2008年 | 21篇 |
2007年 | 20篇 |
2006年 | 18篇 |
2005年 | 19篇 |
2004年 | 15篇 |
2003年 | 13篇 |
2002年 | 9篇 |
2001年 | 1篇 |
2000年 | 1篇 |
1999年 | 3篇 |
1996年 | 2篇 |
1995年 | 5篇 |
1994年 | 1篇 |
1992年 | 1篇 |
1990年 | 1篇 |
1984年 | 1篇 |
排序方式: 共有363条查询结果,搜索用时 0 毫秒
361.
362.
Vellapandi Saravanan Veera Sena Hariharan Arumugam Khajanajimudeen Mohamed Mydeen Balaji Krishnasamy Mohamedmustafa Mohamed Iqbal Alagar Muthukaruppan 《先进技术聚合物》2023,34(2):568-577
An attempt has been made to develop hybrid composites from benzoxazine monomer (C-ddm) hybridized with DGEBA epoxy resin (EP) and reinforced with varying weight percentages (20 wt%, 40 wt%, 60 wt%, 80 wt% and 100 wt%) of glycidoxypropyltrimethoxy- silane (GPTMS) functionalized granite dust (GD) obtained from industrial granite cutting and polishing process in order to utilize them for electrical insulation applications. The thermal stability of granite dust reinforced poly(EP-co-C-ddm) composites was studied by TGA analysis. Among the composites samples studied, 100 wt% GD reinforced poly(EP-co-C-ddm) composites possess better thermal stability than that of other neat matrices and composites. Among the composites prepared using varying weight percentages of functionalized GD reinforcement, it was observed that 80 wt% GD reinforced poly(EP-co-C-ddm) composites possesses better hydrophobic character than that of other neat matrices and composites. The value of LOI calculated for neat matrix (poly[EP-co-C-ddm]) and 20 wt%, 40 wt%, 60 wt%, 80 wt% and 100 wt% GD reinforced composites was found to be 22, 28, 34, 40, 43 and 45 respectively. The 80 wt% GD reinforced poly(EP-co-C-ddm) composites possess the higher values of tensile strength and flexural strength of 47 MPa and 140 MPa, respectively than those of their samples. The values of electrical surface resistivity and electrical volume resistivity of all the neat matrices and GD reinforced polybenzoxazine composites were found to be in the order of 1012 and 1013 respectively. The values of dielectric strength obtained from break down voltage (BDV) for neat matrix [poly(EP-co-C-ddm)] and 20 wt%, 40 wt%, 60 wt%, 80 wt% and 100 wt% of GD reinforced poly(EP-co-C-ddm) composites are 15.0, 15.5, 16.5, 17.0, 17.0 and 17.0 kV/mm, respectively. Data obtained from thermal stability, hydrophobic behavior and dielectric studies it was inferred that the hybrid polymer composites developed in the present work can be conveniently used in the form insulators, sealants, adhesives and matrices where application demands at high-performance industrial and engineering applications. 相似文献
363.
R. Saravanan S. K. Mohanlal K. S. Chandrasekaran 《Crystal Research and Technology》1992,27(2):219-224
The imaginary components of the anomalous dispersion correction terms for the heavy atoms gallium and indium, evcaluated from a systematic and precise experimetal measurement of the Bijvoet ratios for the spherically ground single crystals of GaP and InP, are reported. The procedure used is based on the work of Engel and Sturm who refined the crystal structures involving light atoms using anomalous scattering and employed the measured structure factors to evaluate the f″ values of the heavy atoms. In the present work, instead of refining the crystal structure, the structure factors are obtained using a refinement program. The experimentally evaluated f″ values are in very close agreement with the reported theoretical values. 相似文献