全文获取类型
收费全文 | 9109篇 |
免费 | 630篇 |
国内免费 | 376篇 |
专业分类
电工技术 | 240篇 |
综合类 | 467篇 |
化学工业 | 1284篇 |
金属工艺 | 321篇 |
机械仪表 | 316篇 |
建筑科学 | 710篇 |
矿业工程 | 132篇 |
能源动力 | 414篇 |
轻工业 | 712篇 |
水利工程 | 238篇 |
石油天然气 | 126篇 |
武器工业 | 37篇 |
无线电 | 1026篇 |
一般工业技术 | 1538篇 |
冶金工业 | 1202篇 |
原子能技术 | 472篇 |
自动化技术 | 880篇 |
出版年
2024年 | 22篇 |
2023年 | 150篇 |
2022年 | 184篇 |
2021年 | 269篇 |
2020年 | 233篇 |
2019年 | 233篇 |
2018年 | 226篇 |
2017年 | 273篇 |
2016年 | 307篇 |
2015年 | 271篇 |
2014年 | 388篇 |
2013年 | 724篇 |
2012年 | 440篇 |
2011年 | 684篇 |
2010年 | 525篇 |
2009年 | 487篇 |
2008年 | 476篇 |
2007年 | 548篇 |
2006年 | 530篇 |
2005年 | 375篇 |
2004年 | 384篇 |
2003年 | 316篇 |
2002年 | 305篇 |
2001年 | 224篇 |
2000年 | 170篇 |
1999年 | 156篇 |
1998年 | 211篇 |
1997年 | 132篇 |
1996年 | 126篇 |
1995年 | 90篇 |
1994年 | 84篇 |
1993年 | 63篇 |
1992年 | 49篇 |
1991年 | 54篇 |
1990年 | 55篇 |
1989年 | 49篇 |
1988年 | 33篇 |
1987年 | 23篇 |
1986年 | 28篇 |
1985年 | 37篇 |
1984年 | 24篇 |
1983年 | 22篇 |
1982年 | 16篇 |
1981年 | 7篇 |
1966年 | 7篇 |
1964年 | 22篇 |
1963年 | 11篇 |
1960年 | 9篇 |
1959年 | 7篇 |
1958年 | 6篇 |
排序方式: 共有10000条查询结果,搜索用时 15 毫秒
101.
太赫兹(terahertz,THz) 慢光效应可以有效地提升THz脉冲数据传输的安全性和存储性,而一般THz慢光器件对入射THz波偏振态变化敏感。本文设计了一种超材料结构,其微结构单元由一个十字型谐振器和4个U型谐振器构成。研究表明:基于超材料的THz慢光效应对线偏振光和圆偏振光均不敏感。通过对超材料结构的参数优化,获得到了最大群折射率为1 618的慢光效应。另外,本文在超材料微结构层和SiO2衬底之间嵌入了一层二硫化钼(MoS2)薄膜,当MoS2的载流子浓度从1.7×1017 cm-3增大到5.1×1019 cm-3时,群折射率从1 566减小到26。实现了偏振不敏感全光可调谐的THz慢光效应。该研究有望为偏振不敏感和全光可调谐的THz慢光器件设计提供崭新的研究思路。 相似文献
102.
Yeshu Tan Jianrui Feng Haobo Dong Longxiang Liu Siyu Zhao Feili Lai Tianxi Liu Ying Bai Ivan P. Parkin Guanjie He 《Advanced functional materials》2023,33(4):2209967
Platinum (Pt) is regarded as a promising electrocatalyst for hydrogen evolution reaction (HER). However, its application in an alkaline medium is limited by the activation energy of water dissociation, diffusion of H+, and desorption of H*. Moreover, the formation of effective structures with a low Pt usage amount is still a challenge. Herein, guided by the simulation discovery that the edge effect can boost local electric field (LEF) of the electrocatalysts for faster proton diffusion, platinum nanocrystals on the edge of transition metal phosphide nanosheets are fabricated. The unique heterostructure with ultralow Pt amount delivered an outstanding HER performance in an alkaline medium with a small overpotential of 44.5 mV and excellent stability for 80 h at the current density of −10 mA cm−2. The mass activity of as-prepared electrocatalyst is 2.77 A mg−1Pt, which is 15 times higher than that of commercial Pt/C electrocatalysts (0.18 A mg−1Pt). The density function theory calculation revealed the efficient water dissociation, fast adsorption, and desorption of protons with hybrid structure. The study provides an innovative strategy to design unique nanostructures for boosting HER performances via achieving both synergistic effects from hybrid components and enhanced LEF from the structural edge effect. 相似文献
103.
Bolun Peng Quanqian Lyu Miaomiao Li Shuo Du Jintao Zhu Lianbin Zhang 《Advanced functional materials》2023,33(18):2214045
Solar steam generation (SSG) through hydrogel-based evaporators has shown great promise for freshwater production. However, developing hydrogel-based evaporators with stable SSG performance in high-salinity brines remains challenging. Herein, phase-separated polyzwitterionic hydrogel-based evaporators are presented with sponge-like structures comprising interconnected pores for stable SSG performance, which are fabricated by photopolymerization of sulfobetaine methacrylate (SBMA) in water-dimethyl sulfoxide (DMSO) mixed solvents. It is shown that driven by competitive adsorption, the structures of the resulting poly(sulfobetaine methacrylate) (PSBMA) hydrogels can be readily tuned by the volume ratio of DMSO to achieve phase separation. The optimized phase-separated PSBMA hydrogels, combining the unique anti-polyelectrolyte effects of polyzwitterionic hydrogels, demonstrate a rapid water transport capability in brines. After introducing photothermal polypyrrole particles on the surface of the phase-separated PSBMA hydrogel evaporators, a stable water evaporation rate of ≈2.024 kg m−2 h−1 and high solar-to-vapor efficiency of ≈97.5% in a 3.5 wt.% brine are obtained under simulated solar light irradiation (1.0 kW m−2). Surprisingly, the evaporation rates remain stable even under high-intensity solar irradiation (2.0 kW m−2). It is anticipated that the polyzwitterionic hydrogel evaporators with sponge-like porous structures will contribute to developing SSG technology for high-salinity seawater applications. 相似文献
104.
CMOS图像传感器(CIS)工作在空间辐射或核辐射环境中遭受的辐照损伤问题备受关注。对CIS辐照损伤效应进行仿真模拟研究有助于深入揭示辐照损伤机理,进而开展抗辐射加固设计,有效提升CIS抗辐照能力。文章通过梳理国内外开展CIS辐照损伤效应仿真模拟研究方面的进展情况,结合课题组已开展的电子元器件辐照效应仿真模拟和实验研究基础,从CIS器件建模、时序驱动电路建模、辐照损伤效应建模、仿真模拟结果校验等方面探讨了CIS辐照损伤效应的仿真模拟方法,分析总结了当前CIS辐照效应仿真模拟研究中亟待解决的关键技术问题。 相似文献
105.
The effect of dynamic strain rates on failure responses of a fine‐grained granitic rock is studied experimentally and theoretically. Theoretical investigation employs a model incorporating dynamic fracture criterion with damage mechanics theory. Experimental investigation is conducted using split Hopkinson pressure bar device. In order to investigate the effects of microstructure on dynamic fracture failure under different loading rates, fragment debris of each tested specimen is collected and analyzed. It is found through the debris analysis that the granitic rock breaks down into the fragment debris in grain size scales and the effect of strain rates on the formation of fragment debris appears to be related to the microstructure of the rock. It is also found that dynamic inertia induced by the dynamic loading can reduce the effect of friction confinement generated by the contact between the cylindrical specimen and two split Hopkinson pressure bars on the dynamic responses of the specimen. Theoretical evaluations agree with the corresponding experimental observations. 相似文献
106.
107.
Cijun Shuai Chongxian He Liang Xu Quan Li Tong Chen 《Virtual and Physical Prototyping》2018,13(4):292-300
The discrete secondary phases usually cause severe galvanic corrosion, thereby resulting in rapid degradation for Mg–Al alloys in orthopaedics application. In this study, CaO was introduced into Mg–Al–Zn (AZ61) alloy via selective laser melting (SLM) to ameliorate the characterisations of the secondary phases, with an aim to improve its corrosion behaviour. Results revealed that CaO reacted with Mg and Al in Mg–Al alloys during SLM, suppressing the formation of coarse Mg17Al12 phase and promoting the formation of (Mg, Al)2Ca phase. Meanwhile, the rapid solidification during SLM promoted the homogeneous precipitation of the second phase. As a result, inert (Mg, Al)2Ca phase homogeneously wrapped the Mg grains, which effectively protected them from the invasion of corrosion solution. Thus, the degradation rate was remarkably reduced from 0.073 to 0.031?mg?cm–2?h–1. Furthermore, AZ61-9CaO exhibited good cytocompatibility. This work suggested that AZ61-9CaO was promising candidates for orthopaedics implants. 相似文献
108.
109.
S. K. Mishra L. C. Pathak V. Rao D. Bhattacharya K. L. Chopra 《Journal of Superconductivity》1996,9(2):211-216
Critical current densities of the superconducting Y-Ba-Cu-O (YBCO) films have been observed to decrease with the increase of power of microwave radiation. Presence of Josephson type of junctions in the microbridges has been established from the microwave irradiation and magnetic field studies. BCS energy gap parameter (2/kT
c
) has been calculated from thedI/dV characteristics and found to be 3.7 at 13 K. 相似文献
110.
Vimal Singh 《Automatica》2010,46(2):475-4311
A criterion for the global asymptotic stability of fixed-point state-space digital filters using two’s complement arithmetic is presented. The criterion is a modified form of a well-known criterion due to Mills, Mullis, and Roberts. The criterion is in the form of linear matrix inequality and, hence, computationally tractable. An example shows the effectiveness of the modified criterion. 相似文献