全文获取类型
收费全文 | 434篇 |
免费 | 32篇 |
国内免费 | 4篇 |
专业分类
电工技术 | 5篇 |
综合类 | 5篇 |
化学工业 | 106篇 |
金属工艺 | 9篇 |
机械仪表 | 20篇 |
建筑科学 | 19篇 |
矿业工程 | 2篇 |
能源动力 | 30篇 |
轻工业 | 38篇 |
水利工程 | 9篇 |
石油天然气 | 7篇 |
无线电 | 36篇 |
一般工业技术 | 100篇 |
冶金工业 | 20篇 |
原子能技术 | 6篇 |
自动化技术 | 58篇 |
出版年
2023年 | 6篇 |
2022年 | 9篇 |
2021年 | 22篇 |
2020年 | 18篇 |
2019年 | 31篇 |
2018年 | 36篇 |
2017年 | 24篇 |
2016年 | 26篇 |
2015年 | 14篇 |
2014年 | 29篇 |
2013年 | 41篇 |
2012年 | 36篇 |
2011年 | 30篇 |
2010年 | 24篇 |
2009年 | 13篇 |
2008年 | 24篇 |
2007年 | 15篇 |
2006年 | 12篇 |
2005年 | 8篇 |
2004年 | 8篇 |
2003年 | 4篇 |
2002年 | 6篇 |
2001年 | 2篇 |
2000年 | 1篇 |
1999年 | 6篇 |
1998年 | 2篇 |
1997年 | 3篇 |
1995年 | 1篇 |
1993年 | 1篇 |
1992年 | 2篇 |
1991年 | 1篇 |
1990年 | 3篇 |
1988年 | 1篇 |
1987年 | 2篇 |
1986年 | 1篇 |
1985年 | 3篇 |
1984年 | 1篇 |
1979年 | 1篇 |
1976年 | 1篇 |
1974年 | 1篇 |
1969年 | 1篇 |
排序方式: 共有470条查询结果,搜索用时 31 毫秒
31.
Soroosh Sharifi‐Asl Fernando A. Soto Tara Foroozan Mohammad Asadi Yifei Yuan Ramasubramonian Deivanayagam Ramin Rojaee Boao Song Xuanxuan Bi Khalil Amine Jun Lu Amin Salehi‐khojin Perla B. Balbuena Reza Shahbazian‐Yassar 《Advanced functional materials》2019,29(23)
LiCoO2 is a prime example of widely used cathodes that suffer from the structural/thermal instability issues that lead to the release of their lattice oxygen under nonequilibrium conditions and safety concerns in Li‐ion batteries. Here, it is shown that an atomically thin layer of reduced graphene oxide can suppress oxygen release from LixCoO2 particles and improve their structural stability. Electrochemical cycling, differential electrochemical mass spectroscopy, differential scanning calorimetry, and in situ heating transmission electron microscopy are performed to characterize the effectiveness of the graphene‐coating on the abusive tolerance of LixCoO2. Electrochemical cycling mass spectroscopy results suggest that oxygen release is hindered at high cutoff voltage cycling when the cathode is coated with reduced graphene oxide. Thermal analysis, in situ heating transmission electron microscopy, and electron energy loss spectroscopy results show that the reduction of Co species from the graphene‐coated samples is delayed when compared with bare cathodes. Finally, density functional theory and ab initio molecular dynamics calculations show that the rGO layers could suppress O2 formation more effectively due to the strong C? Ocathode bond formation at the interface of rGO/LCO where low coordination oxygens exist. This investigation uncovers a reliable approach for hindering the oxygen release reaction and improving the thermal stability of battery cathodes. 相似文献
32.
34.
35.
Yoojin Jung Paul T. Imhoff Don C. Augenstein Ramin Yazdani 《Canadian Metallurgical Quarterly》2009,135(3):138-146
Gas collection systems of various designs have been used to control landfill gas emissions, which can be problematic, particularly before installation of final landfill covers. In this work, an innovative gas collection system that includes a permeable layer near the top surface of landfills was evaluated for enhancing capture of landfill gas and reducing fugitive methane emissions. A computational model that accounts for advective and diffusive fluxes of multiple gas components was used to evaluate the efficiency of this new design for intermediate landfill covers. The utility of the high-permeability gas-conductive layer was illustrated for several conditions of interest including varying refuse permeability, varying degrees of permeability anisotropy, and temporal atmospheric pressure changes. Simulations showed that the permeable layer decreased methane emissions by 43% when the horizontal to vertical permeability ratio for refuse was kh/kv = 3 and the domain average kh = 3×10?12?m2, while reductions in methane emissions decreased to 17% for the same anisotropy but with kh = 10?11?m2. With this design, barometric pressure changes did not significantly affect oxygen intrusion or methane emission rates. 相似文献
36.
Ali Najafi Aria Alasty Ramin Vatankhah Mohammad Eghtesad Farhang Daneshmand 《Asian journal of control》2017,19(6):2219-2225
Boundary stabilization of vibrating three‐dimensional Cosserat elastic solids are studied using mathematical tools, such as operator theory and semigroup techniques. The advantages of the boundary control laws for both boundary stabilization problems are investigated. The boundary stabilization problems are studied using a Lyapunov stability method and LaSalle's invariant set theorem. Numerical simulations are provided to illustrate the effectiveness and performance of the designed control scheme. 相似文献
37.
Mandeep M. Sahani Tarek M. Daoud Ramin Sam Jerry Andrews Yuk Lun Cheng Carl M. Kjellstrand Todd S. Ing 《Hemodialysis international. International Symposium on Home Hemodialysis》2001,5(1):92-96
An aggressive dialysis in a grossly azotemic patient, especially one with severe metabolic acidosis, can lead to dialysis disequilibrium syndrome (DDS). Mild forms present as nausea, vomiting, restlessness, and headache. Severe manifestations include seizures, obtundation, coma, and even death. This clinical picture is caused by cerebral edema induced by one or more of the following mechanisms:
- 相似文献
38.
39.
Majid Aryafar Ramin Raiszadeh Alireza Shalbafzadeh 《Journal of Materials Science》2010,45(11):3041-3051
The possibility of the bonding of the two layers of a double oxide film defect when held in liquid A356 Al alloy was investigated.
The defect was modelled experimentally by maintaining two aluminium oxide layers in contact with each other and the atmosphere
trapped between them in the A356 liquid alloy for varying lengths of time of between 30 s and 48 h. Any changes in the composition
and morphology of these layers were studied by SEM, EDX and XRD. The results showed that the two layers of a double oxide
film defect might bond to each other by two different mechanisms, one during the transformation of Al2O3 to MgAl2O4 spinel in relatively short holding times, which would cause the layers to bond at several points and the other during the
gradual transformation of spinel to MgO in longer times, which would cause strong bonding between the layers. It was shown
that any bonding can take place essentially only after the oxygen and nitrogen of the atmosphere within the defect are consumed. 相似文献
40.
Ricardo de O. Schmidt Ramin Sadre Luuk Hendriks 《Journal of Network and Systems Management》2016,24(3):746-753
This is the report on the Workshop on Flow-Based Network Management, held within the 37th IRTF NMRG meeting, during IETF 93, on 24th July 2015, in Prague, Czech Republic. Following the tradition of the IRTF NMRG, the workshop focused on technologies, developments, and challenges of using flow-level traffic measurements for network management. 相似文献