全文获取类型
收费全文 | 322篇 |
免费 | 6篇 |
专业分类
电工技术 | 2篇 |
化学工业 | 62篇 |
金属工艺 | 10篇 |
机械仪表 | 9篇 |
建筑科学 | 4篇 |
矿业工程 | 1篇 |
能源动力 | 5篇 |
轻工业 | 3篇 |
石油天然气 | 6篇 |
无线电 | 30篇 |
一般工业技术 | 77篇 |
冶金工业 | 90篇 |
原子能技术 | 13篇 |
自动化技术 | 16篇 |
出版年
2023年 | 3篇 |
2022年 | 11篇 |
2021年 | 6篇 |
2020年 | 6篇 |
2019年 | 4篇 |
2018年 | 9篇 |
2017年 | 4篇 |
2016年 | 6篇 |
2015年 | 4篇 |
2014年 | 9篇 |
2013年 | 14篇 |
2012年 | 9篇 |
2011年 | 18篇 |
2010年 | 12篇 |
2009年 | 13篇 |
2008年 | 21篇 |
2007年 | 7篇 |
2006年 | 13篇 |
2005年 | 4篇 |
2004年 | 13篇 |
2003年 | 11篇 |
2002年 | 12篇 |
2001年 | 9篇 |
2000年 | 15篇 |
1999年 | 6篇 |
1998年 | 9篇 |
1997年 | 11篇 |
1996年 | 14篇 |
1995年 | 8篇 |
1994年 | 3篇 |
1993年 | 3篇 |
1992年 | 2篇 |
1991年 | 2篇 |
1990年 | 4篇 |
1987年 | 3篇 |
1983年 | 2篇 |
1979年 | 1篇 |
1978年 | 2篇 |
1977年 | 1篇 |
1976年 | 4篇 |
1975年 | 2篇 |
1974年 | 1篇 |
1973年 | 2篇 |
1972年 | 1篇 |
1971年 | 1篇 |
1970年 | 1篇 |
1967年 | 1篇 |
1966年 | 1篇 |
1964年 | 3篇 |
1962年 | 2篇 |
排序方式: 共有328条查询结果,搜索用时 15 毫秒
31.
32.
33.
D. Tillakhodzhaev M. U. Sadykov Yu. Yu. Lazauskas T. A. Sabirov F. P. Chumakov I. Taleikene 《Fibre Chemistry》1987,18(3):233-236
Conclusions Results of this research have shown the efficiency and economic advisability of using the method of reagent treatment of wastewater from the washing division of plants manufacturing triacetate yarns, with the objective of cleaning them up from A-1 lubricant.The economic benefit on introduction of the developed method for cleaning up wastewater from A-1 lubricant will be 351,000 rubles per year at the Kaunas plant and 102,000 rubles per year at the Engels plant.Translated from Khimicheskie Volokna, No. 3, pp. 53–55, May–June, 1986. 相似文献
34.
Method for reconstructing atmospheric optical parameters from the data of polarization lidar sensing
Inversion of polarization lidar sensing data based on the form of the lidar sensing equation with allowance for contributions from multiple-scattering calls for a priori information on the scattering phase matrix. In the present study the parameters of the Stokes vectors for various propagation media, including those with the scattering phase matrices that vary along the measuring range, are investigated. It is demonstrated that, in spaceborne lidar sensing, a simple parameterization of the multiple-scattering contribution is applicable and the polarization signal's characteristics depend mainly on the lidar and depolarization ratios, whereas differences in the angular dependences of the matrix components are no longer determining factors. An algorithm for simultaneous reconstruction of the profiles of the backscattering coefficient and depolarization and lidar ratios in an inhomogeneous medium is suggested. Specific features of the methods are analyzed for the examples of interpretation of lidar signal profiles calculated by the Monte Carlo method and are measured experimentally. 相似文献
35.
1. | Rolling of steel at 1100° and higher leads to austenite grain growth after annealing. |
2. | A recrystallization threshold appears with plastic deformation at temperatures up to 1100°, the range of the recrystallization threshold broadening as the temperature of the preceding plastic deformation decreases. Plastic deformation =20% at 1150° always leads to a jump of austenite grain growth with repeated quenching, and for steel rolled at 1150 and 1200° the region of austenite grain growth broadens to =30–40%. |
3. | At all degrees of deformation at different temperatures the average diameter of austenite grains decreases with decreasing preliminary rolling temperatures and increasing degrees of repeated plastic deformation. This undoubtedly affects the consistency of the properties inherited by high-speed steel during subsequent high-temperature plastic deformation. |
36.
37.
Yangkun He Gerhard H. Fecher Chenguang Fu Yu Pan Kaustuv Manna Johannes Kroder Ajay Jha Xiao Wang Zhiwei Hu Stefano Agrestini Javier Herrero-Martín Manuel Valvidares Yurii Skourski Walter Schnelle Plamen Stamenov Horst Borrmann Liu Hao Tjeng Rudolf Schaefer Stuart S. P. Parkin John Michael D. Coey Claudia Felser 《Advanced materials (Deerfield Beach, Fla.)》2020,32(45):2004331
The development of high-density magnetic recording media is limited by superparamagnetism in very small ferromagnetic crystals. Hard magnetic materials with strong perpendicular anisotropy offer stability and high recording density. To overcome the difficulty of writing media with a large coercivity, heat-assisted magnetic recording was developed, rapidly heating the media to the Curie temperature Tc before writing, followed by rapid cooling. Requirements are a suitable Tc, coupled with anisotropic thermal conductivity and hard magnetic properties. Here, Rh2CoSb is introduced as a new hard magnet with potential for thin-film magnetic recording. A magnetocrystalline anisotropy of 3.6 MJ m−3 is combined with a saturation magnetization of μ0Ms = 0.52 T at 2 K (2.2 MJ m−3 and 0.44 T at room temperature). The magnetic hardness parameter of 3.7 at room temperature is the highest observed for any rare-earth-free hard magnet. The anisotropy is related to an unquenched orbital moment of 0.42 μB on Co, which is hybridized with neighboring Rh atoms with a large spin–orbit interaction. Moreover, the pronounced temperature dependence of the anisotropy that follows from its Tc of 450 K, together with a thermal conductivity of 20 W m−1 K−1, make Rh2CoSb a candidate for the development of heat-assisted writing with a recording density in excess of 10 Tb in.−2. 相似文献
38.
Dirk H. Ortgies Francisco J. Teran Uéslen Rocha Leonor de la Cueva Gorka Salas David Cabrera Alexander S. Vanetsev Mihkel Rähn Väino Sammelselg Yurii V. Orlovskii Daniel Jaque 《Advanced functional materials》2018,28(11)
Magnetic nanoparticles (M:NPs) are unique agents for in vivo thermal therapies due to their multimodal capacity for efficient heat generation under optical and/or magnetic excitation. Nevertheless, their transfer from laboratory to the clinic is hampered by the absence of thermal feedback and by the influence that external conditions (e.g., agglomeration and biological matrix interactions) have on their heating efficiency. Overcoming these limitations requires, first, the implementation of strategies providing thermal sensing to M:NPs in order to obtain in situ thermal feedback during thermal therapies. At the same time, M:NPs should be modified so that their heating efficiency will be maintained independently of the environment and the added capability for thermometry. In this work, optomagnetic hybrid nanostructures (OMHSs) that simultaneously satisfy these two conditions are presented. Polymeric encapsulation of M:NPs with neodymium‐doped nanoparticles results in a hybrid structure capable of subtissue thermal feedback while making the heating efficiency of M:NPs independent of the medium. The potential application of the OMHSs herein developed for fully controlled thermal therapies is demonstrated by an ex vivo endoscope‐assisted controlled intracoronary heating experiment. 相似文献
39.
An organometallic approach was used to functionalize multiwalled carbon nanotubes with n-butyllithium. This procedure was repeated two more times to achieve a higher degree of multiwalled carbon nanotube functionalization. The functionalized nanotubes have been characterized by Fourier transform infrared and Raman spectroscopy, thermogravimetrical analysis, scanning electron microscopy and sedimentation studies. It was possible to form stable suspensions of the functionalized nanotubes in tetrahydrofuran and they were used to make nanotube polymer composites. The mechanical properties of these new nanotube polymer composites were tested and they were found to show an increase of up to 25% in their Young's moduli and up to 50% in their tensile strength over pure polystyrene. 相似文献
40.
Hernandez Y Nicolosi V Lotya M Blighe FM Sun Z De S McGovern IT Holland B Byrne M Gun'Ko YK Boland JJ Niraj P Duesberg G Krishnamurthy S Goodhue R Hutchison J Scardaci V Ferrari AC Coleman JN 《Nature nanotechnology》2008,3(9):563-568
Fully exploiting the properties of graphene will require a method for the mass production of this remarkable material. Two main routes are possible: large-scale growth or large-scale exfoliation. Here, we demonstrate graphene dispersions with concentrations up to approximately 0.01 mg ml(-1), produced by dispersion and exfoliation of graphite in organic solvents such as N-methyl-pyrrolidone. This is possible because the energy required to exfoliate graphene is balanced by the solvent-graphene interaction for solvents whose surface energies match that of graphene. We confirm the presence of individual graphene sheets by Raman spectroscopy, transmission electron microscopy and electron diffraction. Our method results in a monolayer yield of approximately 1 wt%, which could potentially be improved to 7-12 wt% with further processing. The absence of defects or oxides is confirmed by X-ray photoelectron, infrared and Raman spectroscopies. We are able to produce semi-transparent conducting films and conducting composites. Solution processing of graphene opens up a range of potential large-area applications, from device and sensor fabrication to liquid-phase chemistry. 相似文献