全文获取类型
收费全文 | 12937篇 |
免费 | 978篇 |
国内免费 | 1079篇 |
专业分类
电工技术 | 493篇 |
技术理论 | 1篇 |
综合类 | 882篇 |
化学工业 | 2314篇 |
金属工艺 | 258篇 |
机械仪表 | 519篇 |
建筑科学 | 693篇 |
矿业工程 | 217篇 |
能源动力 | 1289篇 |
轻工业 | 1126篇 |
水利工程 | 99篇 |
石油天然气 | 220篇 |
武器工业 | 159篇 |
无线电 | 2488篇 |
一般工业技术 | 1693篇 |
冶金工业 | 273篇 |
原子能技术 | 1797篇 |
自动化技术 | 473篇 |
出版年
2024年 | 52篇 |
2023年 | 169篇 |
2022年 | 420篇 |
2021年 | 483篇 |
2020年 | 400篇 |
2019年 | 367篇 |
2018年 | 270篇 |
2017年 | 428篇 |
2016年 | 481篇 |
2015年 | 444篇 |
2014年 | 610篇 |
2013年 | 1075篇 |
2012年 | 828篇 |
2011年 | 940篇 |
2010年 | 672篇 |
2009年 | 754篇 |
2008年 | 610篇 |
2007年 | 835篇 |
2006年 | 778篇 |
2005年 | 649篇 |
2004年 | 571篇 |
2003年 | 534篇 |
2002年 | 413篇 |
2001年 | 348篇 |
2000年 | 271篇 |
1999年 | 244篇 |
1998年 | 215篇 |
1997年 | 164篇 |
1996年 | 152篇 |
1995年 | 130篇 |
1994年 | 106篇 |
1993年 | 81篇 |
1992年 | 87篇 |
1991年 | 62篇 |
1990年 | 56篇 |
1989年 | 39篇 |
1988年 | 50篇 |
1987年 | 43篇 |
1986年 | 29篇 |
1985年 | 37篇 |
1984年 | 25篇 |
1983年 | 16篇 |
1982年 | 18篇 |
1981年 | 12篇 |
1980年 | 2篇 |
1979年 | 3篇 |
1978年 | 2篇 |
1976年 | 3篇 |
1959年 | 10篇 |
1951年 | 1篇 |
排序方式: 共有10000条查询结果,搜索用时 0 毫秒
51.
Radiation‐induced simultaneous grafting of styrene onto polytetrafluoroethylene (PTFE) films and the subsequent sulfonation in the chlorosulfonic acid/dichloroethane were investigated. The effects of the main radiation grafting conditions, such as the type of solvents, irradiation dose, dose rate, the styrene concentrations, etc., on the degree of grafting (DOG) were studied. To elucidate the influence of both the grafting and sulfonation conditions on the properties of the PTFE‐g‐polystyrene‐sulfonic acid (PSSA) membranes, the sulfonation conditions, including the sulfonation temperature and the concentration of the ClSO3H with respect to the DOG, were systematically evaluated. The grafted and sulfonated membranes were characterized by FTIR–ATR spectra, ion‐exchange capacity (IEC), water uptake, thickness measurement, etc. The as‐prepared PTFE‐g‐PSSA membranes in this work showed a good combination of a high IEC (0.85–2.75 meq g?1), acceptable water uptake (8.86–56.9 wt %), low thickness, and volume expansion and/or contraction. © 2005 Wiley Periodicals, Inc. J Appl Polym Sci 99: 1415–1428, 2006 相似文献
52.
分析了煤矿井下输电巷道、牵引网络及电机车巷道、机电硐室内以及通信系统的电磁干扰特点及传播路径,并对某煤矿井下不同区域的电磁干扰进行了测试;通过分析测试数据,参考GB 9175—88《环境电磁波卫生标准》对各区域的电磁环境进行了评价,结果表明所测试环境均达到一级环境电磁场的标准。 相似文献
53.
Results of studying thermal decomposition of ammonium perchlorate (AP) samples in the original form and after irradiation
by γ-quanta of 60Co by methods of differential scanning calorimetry and dynamic thermogravimetry with heating rates b = 0.1–0.3 K/sec are described. Irradiation is performed in air at a temperature of 298 ± 2 K and a dose rate of ≈0.2 Gy/sec
in the range of absorbed doses D = 0–150 kGy. Preliminary irradiation is demonstrated to lead to substantial transformations of the pattern of thermal decomposition
of ammonium perchlorate in the dynamic regime of heating: the single-stage process of decomposition of non-irradiated samples
proceeding at b = 0.107 K/sec in the temperature range of 625 to 743 K is replaced by a multistage process. At D = 150 kGy, exothermal transformations accompanied by noticeable losses of sample mass are observed starting from 473 K. Within
experimental errors, the total thermal effect of AP decomposition is found to be independent of the absorbed dose and amounts
to −1150 kJ/kg on the average.
__________
Translated from Fizika Goreniya i Vzryva, Vol. 43, No. 6, pp. 69–74, November–December, 2007. 相似文献
54.
Radiation‐induced graft copolymerization of maize starch/acrylic acid has been performed. Also, natural byproduct wood pulp was used after chemical treatment for the removal of metal ions from the investigated wastewater. The surface and structure morphology of the wood pulp and starch/acrylic acid were investigated by scanning electron microscopy and infrared spectroscopy. The physical parameters, such as swelling, gel percentage, and grafting efficiency (%) of starch/acrylic acid copolymer, were studied. The factors affecting the abilities of the prepared materials for removing heavy metal ions and dyes from aqueous solutions were studied. It was found that the maximum metal uptake is in the following sequence: Fe3+ > Cr3+ > Pb2+ > Cd2+. The adsorption capacity of such investigated metal ions increases with the increase of pH values. © 2005 Wiley Periodicals, Inc. J Appl Polym Sci, 2006 相似文献
55.
A low profile circularly polarized (CP) antenna with reconfigurable polarization is designed and presented, which can radiate omnidirectional patterns that can be switched between left‐hand circularly polarized (LHCP) and right‐hand circularly polarized (RHCP). A pair of arc‐shaped complementary dipoles is acted as reconfigurable elements by bridging four pin diodes at the dipole arced arms. A meander phase shift line is employed to connected the arc dipole arms and plate cavity to adjust the phase relationship of two sources. The proposed antenna exhibits the omnidirectional radiation pattern by combining six identical elements placed in a circular array configuration. 24 p‐i‐n diodes are exploited to six elements, by manipulating the dc bias voltage across the diodes, the polarization state of the antenna can be switched. The patterns of the antenna are similar to that of a dipole, but its size is only about Φ0.87 × 0.029λ0 at 5.8 GHz. The overlapped bandwidth of measured 3‐dB axial ratio (AR) and 10‐dB return loss is 5.724‐5.87 and 5.738‐5.91 GHz for two polarization states, which are right on the target of ISM band. It can be well adapted to medical diagnosis systems. 相似文献
56.
57.
Recent progress of CERN RD50 Collaboration 总被引:1,自引:0,他引:1
P. LUUKKA 《中国有色金属学会会刊》2006,16(B01):133-136
The objective of the CERN RD50 Collaboration is to develop radiation hard semiconductor detectors for very high luminosity colliders, in particular, for the upgrade of the large hadron collider (LHC) which itself is scheduled to be operational in 2007. The approach of the RD50 has two major research lines, material engineering and device engineering. These are further subdivided into projects covering defect characterization and engineering, new detector materials, detector characterization, new detector structures and full detector systems. Presently, 264 members from 53 institutes are actively participating in the RD50 Collaboration. Detectors made of defect engineered substrates, e.g. high resistivity magnetic Czochralski (MCz-Si), epitaxial silicon (Epi-Si) on Czochralski silicon (Cz-Si) substrate, intentionally thermal donor (TD) compensated p-type MCz-Si and oxygen enriched (DOFZ) silicon, have been demonstrated by the RD50 Collaboration. An overview and highlights of the results of these defect engineering techniques were given in this report. 相似文献
58.
ZO U Hongcheng DAI Shujuan QIAN Zhixiong LI Guangxia Huazhong University of Science Technology Wuhan China Originally published in ACTA METALL SIN 《金属学报(英文版)》1989,2(6):428-432
The change of microstructure of fatigue specimens before and after laser radiation was studiedby transmission electron microscopy.The results show that the diameter of dislocation cell λtends to a constant at fatigue failure.Based on the principles of continuous damagemechanics,expressions of the fatigue damage criterion and processes of fatigue damage evolu-tion for L Y12CZ have been derived. 相似文献
59.
60.
辐射源具有强烈的社会敏感性,无论是丢弃还是泄漏,都会给人类社会和环境造成无法估量的损失和危害。为了使其能够进一步造福于人类社会,对辐射源进行规范使用,安全监管尤为重要。文章介绍了一套集辐射源剂量监测、RFID电子标签、GPS地球定位、位移检测、视频监控和管理为一体的安全监管物联网应用系统,以降低辐射源被盗的风险,准确高效地实现辐射源安全监管的目标。 相似文献