全文获取类型
收费全文 | 106324篇 |
免费 | 9512篇 |
国内免费 | 6041篇 |
专业分类
电工技术 | 4212篇 |
技术理论 | 6篇 |
综合类 | 11495篇 |
化学工业 | 14875篇 |
金属工艺 | 6691篇 |
机械仪表 | 6484篇 |
建筑科学 | 22946篇 |
矿业工程 | 4730篇 |
能源动力 | 2501篇 |
轻工业 | 5387篇 |
水利工程 | 2853篇 |
石油天然气 | 5022篇 |
武器工业 | 936篇 |
无线电 | 8343篇 |
一般工业技术 | 10769篇 |
冶金工业 | 3977篇 |
原子能技术 | 693篇 |
自动化技术 | 9957篇 |
出版年
2024年 | 278篇 |
2023年 | 1367篇 |
2022年 | 2565篇 |
2021年 | 3088篇 |
2020年 | 3046篇 |
2019年 | 2488篇 |
2018年 | 2349篇 |
2017年 | 3060篇 |
2016年 | 3262篇 |
2015年 | 3517篇 |
2014年 | 6435篇 |
2013年 | 5676篇 |
2012年 | 7490篇 |
2011年 | 8161篇 |
2010年 | 6268篇 |
2009年 | 6729篇 |
2008年 | 6177篇 |
2007年 | 7280篇 |
2006年 | 6689篇 |
2005年 | 5858篇 |
2004年 | 4780篇 |
2003年 | 4341篇 |
2002年 | 3691篇 |
2001年 | 3087篇 |
2000年 | 2650篇 |
1999年 | 2189篇 |
1998年 | 1718篇 |
1997年 | 1596篇 |
1996年 | 1109篇 |
1995年 | 957篇 |
1994年 | 887篇 |
1993年 | 601篇 |
1992年 | 555篇 |
1991年 | 426篇 |
1990年 | 349篇 |
1989年 | 250篇 |
1988年 | 195篇 |
1987年 | 102篇 |
1986年 | 72篇 |
1985年 | 79篇 |
1984年 | 64篇 |
1983年 | 59篇 |
1982年 | 71篇 |
1981年 | 26篇 |
1980年 | 79篇 |
1979年 | 23篇 |
1978年 | 11篇 |
1976年 | 12篇 |
1975年 | 12篇 |
1951年 | 10篇 |
排序方式: 共有10000条查询结果,搜索用时 968 毫秒
61.
Liang Shi Dainan Zhang Rui Peng Cheng Liu Xiaolei Shi Xueying Wang Huaiwu Zhang 《Journal of the European Ceramic Society》2021,41(11):5526-5530
Mg(1-x)ZnxTa2O6 (x = 0.00?0.08) dielectric ceramics were synthesized via the traditional solid-state reaction method. We used XRD and Rietveld refinement to demonstrate that a pure Mg(1-x)ZnxTa2O6 phase with trirutile structure was formed. Zn2+ substitution helped to decrease the Raman full width at half width of the A1g mode at 703 cm?1, which resulted in an increase in the order and rigidity of the TaO6 octahedron, this in turn contributed to improving the Q×f values. Additionally, the introduction of Zn2+ significantly promoted grain growth and increased the dense, and the molecular polarizability, these factors lead to a higher permittivity. Moreover, enhanced Ta-O bond energy resulted in a more stable TaO6 octahedron in the Mg(1?x)ZnxTa2O6 system, which contributed to enhanced τf values via substitution of Zn2+ doped on the A-site. Correspondingly, the microwave dielectric properties were significantly improved for 0.04-doped samples, obtaining: εr = 27, Q × f = 185,000 GHz (at 7.47 GHz), τf =32 ppm/°C. 相似文献
62.
63.
《Ceramics International》2022,48(2):1889-1897
SiC fiber reinforced ceramic matrix composites (SiCf-CMCs) are considered to be one of the most promising materials in the electromagnetic (EM) stealth of aero-engines, which is expected to achieve strong absorption and broad-band performance. Multiscale structural design was applied to SiCf/Si3N4–SiOC composites by construction of micro/nanoscale heterogeneous interfaces and macro double-layer impedance matching structure. SiCf/Si3N4–SiOC composites were fabricated by using SiC fibers with different conductivities and SiOC–Si3N4 matrices with gradient impedance structures to improve impedance matching effectively. Owing to its unique structure, SiCf/Si3N4–SiOC composites (A3-composites) achieved excellent EM wave absorption performance with a minimum reflection coefficient (RCmin) of ?25.1 dB at 2.45 mm and an effective absorption bandwidth (EAB) of 4.0 GHz at 2.85 mm in X-band. Moreover, double-layer SiCf/Si3N4–SiOC with an improved impedance matching structure obtained an RCmin of ?56.9 dB and an EAB of 4.2 GHz at 3.00 mm, which means it can absorb more than 90% of the EM waves in the whole X-band. The RC is less than ?8 dB at 2.6–2.8 mm from RT to 600 °C in the whole X-band, displaying excellent high-temperature absorption performance. The results provide a new design opinion for broad-band EM absorbing SiCf-CMCs at high temperatures. 相似文献
64.
随着互联网的迅猛发展,建设在线开放课程成为高职院校信息化教学改革的一个方向。首先通过分析国内外的在线课程现状,发现阻碍在线课程发展的共性问题;然后对"常用工具软件"课程现状进行深入调查、分析和研究,提出将虚拟化技术应用到课程建设中以解决网络教学遇到的问题;最后将研究结论应用到教学实践中,用于提升学生专业能力,提高教学效果。 相似文献
65.
Using a comprehensive set of drop weight impact test data (h50) newly compiled from literature for 308 materials, a recent approach to predict impact sensitivities of nitro compounds is generalized to most explosive substances of interest. Compared to previous ones, this procedure is more thoroughly validated and exhibits a good predictive value. Furthermore, it yields new insight into the physical mechanisms involved, explaining for instance the unexpected desensitization of some oxygen-deficient triazoles upon nitration. 相似文献
66.
Traditional maximum power point tracking (MPPT) methods can hardly find global maximum power point (MPP) because output characteristics curve of photovoltaic (PV) array may have multi local maximum power points in irregular shadow, and thus easily fall into the local maximum power point. To address this drawback, Considering that sliding mode variable structure (SMVS) control strategy have such advantages as simple structure, fast response and strong robustness, and P&O method have the advantages of simple principle and convenient implementation, so a new algorithm combining SMVS control method and P&O method is proposed, besides, PI controller is applied to reduce system chattering caused by switching sliding surface. It is applied to MPPT control of PV array in irregular shadow to solve the problem of multi-peak optimization in partial shadow. In order to verity the rationality of the proposed algorithm, the experimental circuit is built, which achieves MPPT control by means of the proposed algorithm and P&O method. The experimental results show that compared with the traditional P&O algorithm, the proposed algorithm can fast track the global MPP, tracking speed increases by 60% and the relative error decreased by 20%. Moreover, the system becomes more stable near the MPP, the fluctuations of output power is greatly reduced, and thus make full use of solar energy. 相似文献
67.
Zhiyuan Jiang Peng Liu Qihui Chen Hung-Jue Sue Tim Bremner Lorenzo P. DiSano 《应用聚合物科学杂志》2020,137(33):48966
Interest in developing high-performance blends for niche applications has grown significantly in efforts to meet ever-increasing harsh environment demands. In this work, four model poly(aryl-ether-ketone)/polybenzimidazole (PAEK/PBI) blends were chosen to study the influence of premixing methods, processing, and matrix polymers, on their mechanical properties. Among the model poly(ether ether ketone) (PEEK) and PBI blends, mechanical properties are greatly enhanced by melt premixing. The molding process mainly affects the matrix crystallinity, which in turn greatly influences fracture toughness of the blend. Poly(ether ketone ketone) (PEKK) and PBI blend exhibits a slightly lower tensile strength and fracture toughness than PEEK/PBI due to the differences in inherent properties of PEEK and PEKK matrices and their interfacial interaction with PBI. The processing−structure–property relationship of PAEK/PBI blends is established to help guide optimal design of high-performance polymer blends for structural applications. © 2020 Wiley Periodicals, Inc. J. Appl. Polym. Sci. 2020 , 137, 48966. 相似文献
68.
介绍了一款汽车雨挡导流片异型塑件两板注射模的结构设计,该模具基于采用常规的滑块抽芯机构及斜顶机构难以实现塑件完全脱模的机构设计困难问题,突破常规设计思路,设计了一种型芯浮顶式侧抽芯机构来实现塑件的自动化注射生产。机构中,在模具开模打开后,通过顶出板及顶杆将塑件和部分成型一同顶出,而后再通过侧边二次顶出机构将塑件从局部型芯上顶出而实现塑件的完全脱模,有效地简化了模具结构设计,降低了模具的加工制造难度,降低了模具的制造成本,模具结构复杂新颖,工作稳定可靠,为异型类塑件的模具结构及机构设计创新设计提供了一个较好的案例借鉴。 相似文献
69.
To improve the electrochemical properties of rare-earth–Mg–Ni-based hydrogen storage alloys, the effects of stoichiometry and Cu-substitution on the phase structure and thermodynamic properties of the ... 相似文献
70.
《Ceramics International》2020,46(17):26895-26902
The structural, optical, and magnetic properties of polycrystalline Nd1-xAxMn0.5Co0.5O3−δ (A = Ba, Sr and Ca; x = 0 and 0.25) perovskite oxides were investigated. The powder XRD pattern demonstrates that the unit cell volume decreases with the changing A-site dopant type. The estimated bandgap energy (Eg) from UV–vis spectroscopic for NdMn0.5Co0.5O3−δ, Nd0.75Ba0.25Mn0.5Co0.5O3−δ, Nd0.75Sr0.25Mn0.5Co0.5O3−δ and Nd0.75Ca0.25Mn0.5Co0.5O3−δ are 3.27, 3.82, 3.79 and 3.53 eV respectively. The substitution of divalent element alters the absorption spectrum, while the redshift optical transition was observed with an increasing ionic radius of dopant. Temperature-dependent magnetization exposes that the Curie temperature (TC) gradually decreases with the decreasing size of alkaline earth metals, and glassy nature was observed at a lower applied magnetic field. The observation of TC can be well explained by the considering of the cationic size disorder parameter in A-site than the random distribution of B-site ions. 相似文献