全文获取类型
收费全文 | 1309篇 |
免费 | 27篇 |
国内免费 | 5篇 |
专业分类
电工技术 | 5篇 |
化学工业 | 162篇 |
金属工艺 | 34篇 |
机械仪表 | 14篇 |
建筑科学 | 20篇 |
矿业工程 | 2篇 |
能源动力 | 51篇 |
轻工业 | 42篇 |
水利工程 | 3篇 |
石油天然气 | 1篇 |
无线电 | 116篇 |
一般工业技术 | 225篇 |
冶金工业 | 510篇 |
原子能技术 | 28篇 |
自动化技术 | 128篇 |
出版年
2023年 | 8篇 |
2022年 | 27篇 |
2021年 | 40篇 |
2020年 | 39篇 |
2019年 | 34篇 |
2018年 | 47篇 |
2017年 | 36篇 |
2016年 | 24篇 |
2015年 | 21篇 |
2014年 | 29篇 |
2013年 | 48篇 |
2012年 | 35篇 |
2011年 | 40篇 |
2010年 | 25篇 |
2009年 | 31篇 |
2008年 | 29篇 |
2007年 | 32篇 |
2006年 | 18篇 |
2005年 | 13篇 |
2004年 | 11篇 |
2003年 | 11篇 |
2002年 | 13篇 |
2001年 | 16篇 |
2000年 | 17篇 |
1999年 | 21篇 |
1998年 | 124篇 |
1997年 | 69篇 |
1996年 | 63篇 |
1995年 | 43篇 |
1994年 | 39篇 |
1993年 | 52篇 |
1992年 | 15篇 |
1991年 | 25篇 |
1990年 | 23篇 |
1989年 | 27篇 |
1988年 | 16篇 |
1987年 | 8篇 |
1986年 | 21篇 |
1985年 | 14篇 |
1984年 | 5篇 |
1983年 | 14篇 |
1982年 | 13篇 |
1981年 | 4篇 |
1980年 | 8篇 |
1978年 | 7篇 |
1977年 | 20篇 |
1976年 | 49篇 |
1975年 | 5篇 |
1974年 | 3篇 |
1970年 | 2篇 |
排序方式: 共有1341条查询结果,搜索用时 15 毫秒
91.
92.
93.
S. K. Tripathi 《Journal of Materials Science》2010,45(20):5468-5471
This article reports the measurements of temperature-dependent barrier height (BH) of CdSe Schottky diodes. These diodes have
been made by thermal evaporation technique on ITO glass and glass substrates at room temperature. The XRD measurements have
been made and the average particle size has been calculated which comes out to be ~20 nm. The Au dots have been made for non-ohmic
contacts. I–V characteristics have been measured at different temperatures (280–330 K). These characteristics obey the thermionic emission
theory. The BH decreases and ideality factor increases with the increase in temperature. Richardson’s plot has been made and
Richardson’s constant has been calculated which is less than the expected value. Capacitance measurements have been done at
different frequencies and the interface states have been calculated. The results have been explained on the basis of BH inhomogeneities. 相似文献
94.
Sumit K. Mishra Nabanita Saha S. Singh Chhemendra Sharma M. V. S. N. Prasad Sachin Gautam Amit Misra Abhishek Gaur Deepika Bhattu Subhasish Ghosh Anubhav Dwivedi Rosalin Dalai Debajyoti Paul Tarun Gupta Sachchida N. Tripathi R. K. Kotnala 《Mapan》2017,32(3):229-241
Estimation of the direct radiative forcing (DRF) by atmospheric particles is uncertain to a large extent owing to uncertainties in their morphology (shape and size), mixing states, and chemical composition. A region-specific database of the aforementioned physico-chemical properties (at individual particle level) is necessary to improve numerically-estimated optical and radiative properties. Till date, there is no detailed observation of the above mentioned properties over Kanpur in the Indo-Gangetic Plain (IGP). To fill this gap, an experiment was carried out at Kanpur (IITK; 26.52°N, 80.23°E, 142 m msl), India from April to July, 2011. Particle types broadly classified as (a) Cu-rich particles mixed with carbon and sulphur (b) dust and clays mixed with carbonaceous species (c) Fe-rich particles mixed with carbon and sulfur and (d) calcite (CaCO3) particles aged with nitrate, were observed. The frequency distributions of aspect ratio (AR; indicator of extent of particle non-sphericity) of total 708 particles from April to June reveal that particles with aspect ratio range >1.2 to ≤1.4 were abundant throughout the experiment except during June when it was found to shift to high AR range, >1.4 to ≤1.6 (followed with another peak of AR i.e. >2 to ≤2.4) due to dust storm conditions enhancing the occurrence of more non-spherical particles over the sampling site. The spherical particles (and close to spherical shape; AR range, 1.0 to ≤1.2) were found to be <20% throughout the experiment with a minimum (11.5%) during June. Consideration of Homogeneous Equivalent Sphere Approximation (HESA) in the optical/radiative model over the study region is found to be irrelevant during the campaign. 相似文献
95.
96.
97.
The present work has been carried out with the aim to synthesize tin oxide decorated reduce graphene oxide nanocomposite (SnO2/RGO-Nc) via in-situ synthesis process and the influence of RGO loading on structural, optical, thermal and dielectric properties of SnO2 has been discussed. The XRD, FESEM coupled with EDX elemental mapping, TEM, FTIR, Raman and XPS results reveal that the SnO2 nanoparticles have been successfully incorporated onto the RGO sheets. The reduction in the energy gap of the composite sample as compared to SnO2 measured from the Tauc’s relation can be attributed to strong coupling between RGO and SnO2 NPs. Thermogravimetric analysis (TGA) shows improved thermal stability of the SnO2/RGO-Nc. From the dielectric measurements, it is observed that the dielectric constant and dielectric loss decreases as frequency of applied field increases. AC conductivity of all samples increases as applied frequency increases which follows Jonscher’s power law. All composite samples show better conductivity as compared to SnO2. This is due to the formation of continuous conductive pathway between SnO2 and RGO sheets. Further high dielectric constant, low loss and high ac conductivity have been observed at optimum loading of RGO in SnO2/RGO2-Nc as compared to other composite samples which is due the percolation effects. The impedance analysis exhibits only one semicircle for SnO2 and SnO2/RGO composite which suggests that the involvement of grain boundaries dominated over the grain contribution. 相似文献
98.
99.
Constraint-based routing gradually becomes an essential enabling mechanism for a variety of emerging network services such as virtual private networking and QoS support. A number of previous works have recognized its significance and investigated many aspects of the operation of constraint-based routing and in particular its variant concerned with determining paths for requests with specific QoS requirements, known as QoS routing. In this work we build on previous results on the cost of QoS routing and investigate the performance/cost trade-offs involved in the operation of a representative QoS routing architecture, elaborate on the constituents of this cost, and identify the main methods for containing the cost that QoS routing incurs on routers. Our results show that the cost of QoS routing is not excessive and that there indeed exist operational configurations, which can achieve reasonable performance gains with only a minimal increase in processing cost when compared to conventional best-effort routing 相似文献
100.
The authors outline a method for generating all possible, canonic, linearly tunable, OTA-C sinusoidal oscillators systematically.<> 相似文献