全文获取类型
收费全文 | 337篇 |
免费 | 16篇 |
国内免费 | 1篇 |
专业分类
电工技术 | 6篇 |
化学工业 | 73篇 |
金属工艺 | 8篇 |
机械仪表 | 11篇 |
建筑科学 | 21篇 |
能源动力 | 35篇 |
轻工业 | 34篇 |
水利工程 | 2篇 |
石油天然气 | 3篇 |
无线电 | 32篇 |
一般工业技术 | 54篇 |
冶金工业 | 17篇 |
原子能技术 | 7篇 |
自动化技术 | 51篇 |
出版年
2023年 | 4篇 |
2022年 | 10篇 |
2021年 | 14篇 |
2020年 | 13篇 |
2019年 | 13篇 |
2018年 | 18篇 |
2017年 | 11篇 |
2016年 | 14篇 |
2015年 | 4篇 |
2014年 | 17篇 |
2013年 | 33篇 |
2012年 | 22篇 |
2011年 | 31篇 |
2010年 | 15篇 |
2009年 | 10篇 |
2008年 | 6篇 |
2007年 | 16篇 |
2006年 | 7篇 |
2005年 | 7篇 |
2004年 | 6篇 |
2003年 | 8篇 |
2002年 | 5篇 |
2001年 | 4篇 |
2000年 | 5篇 |
1999年 | 2篇 |
1998年 | 4篇 |
1997年 | 5篇 |
1995年 | 5篇 |
1994年 | 4篇 |
1993年 | 7篇 |
1992年 | 4篇 |
1991年 | 5篇 |
1990年 | 4篇 |
1989年 | 3篇 |
1988年 | 1篇 |
1987年 | 2篇 |
1986年 | 4篇 |
1985年 | 4篇 |
1984年 | 1篇 |
1983年 | 1篇 |
1981年 | 2篇 |
1980年 | 1篇 |
1976年 | 1篇 |
1959年 | 1篇 |
排序方式: 共有354条查询结果,搜索用时 15 毫秒
351.
Salam Abdulqadir Abdulrahman 《The International journal of environmental studies》2017,74(6):1013-1030
The constitution of Iraq affects the development by the Kurdistan Region of Iraq of its natural resources, oil in particular. The paper examines the constitution’s provisions in regard to natural resource questions. The Kurdistan Regional Government should give adequate attention to water problems and adopt a transparent oil and gas policy. There should be a new settlement for the disputed territories outside the current constitutional framework. 相似文献
352.
Elsayed M. E. Zayed Alngar Mohamed E. M. Biswas Anjan Ekici Mehmet Khan Salam Alshomrani Ali Saleh 《Journal of Communications Technology and Electronics》2021,66(5):481-544
Journal of Communications Technology and Electronics - This paper recovers soliton solutions to perturbed pure–cubic complex Ginzburg–Landau equation having a dozen forms of nonlinear... 相似文献
353.
The e 1-modification law has been proposed by K.S. Narendra and A.M. Annaswamy (ibid., vol.32, no.2, pp.134-5, 1987) for robust model reference adaptive control in the presence of bounded disturbances. Using this law, it is shown by the present authors that, in the case of regulation, a prototype adaptive control system with a single unknown pole and an unknown constant disturbance at its input possesses multiple equilibria and undergoes various bifurcations. Simulations and local analysis give a complete characterization of the possible dynamics exhibited by the disturbance adaptive system. As the constant disturbance is varied, saddle-node bifurcation, (subcritical) Hopf bifurcation, and saddle-connection bifurcation occur in that order. Consequently, in this case, the e 1-modification law is qualitatively equivalent to the σ-modification law 相似文献
354.
Reda M. El‐Shishtawy M. Abdel Salam M.A. Gabal Abdullah M. Asiri 《Polymer Composites》2012,33(4):532-539
New electromagnetic nanocomposites were prepared from polyaniline (PANI)/oxidized single‐walled carbon nanotubes (OxSWCNTs)/NiFe2O4 by in situ polymerization of aniline using hexanoic acid as a soft template. OxSWCNT and NiFe2O4 were prepared first so as to be used in the formulation of PANI composites. Transmission electron microscope (TEM) results revealed the formation of PANI nanoparticles of 60 nm diameter, OxSWCNT of 24 nm, and NiFe2O4 of 54 nm. Also, TEM image of the ternary composite indicated agglomerative coating of PANI appearing as a gray shells and black core of NiFe2O4 with widening the diameter of OxSWCNT to be around 66 nm. Dc conductivity was measured as a function of temperature. Magnetic susceptibility was measured as a function of temperature and magnetic field intensity. All samples revealed NiFe2O4‐dependent ferromagnetism. The activation energies for dc conductivity suggest that the conductivity is owing to hopping conduction mechanism. A synergistic effect between NiFe2O4 and PANI/OxSWCNT is observed. POLYM. COMPOS.,, 2012. © 2012 Society of Plastics Engineers 相似文献