全文获取类型
收费全文 | 47395篇 |
免费 | 6125篇 |
国内免费 | 3294篇 |
学科分类
工业技术 | 56814篇 |
出版年
2024年 | 265篇 |
2023年 | 1257篇 |
2022年 | 2381篇 |
2021年 | 3404篇 |
2020年 | 2331篇 |
2019年 | 1766篇 |
2018年 | 1783篇 |
2017年 | 1952篇 |
2016年 | 1725篇 |
2015年 | 2385篇 |
2014年 | 2850篇 |
2013年 | 3234篇 |
2012年 | 3750篇 |
2011年 | 3821篇 |
2010年 | 3292篇 |
2009年 | 3093篇 |
2008年 | 2998篇 |
2007年 | 2691篇 |
2006年 | 2394篇 |
2005年 | 2116篇 |
2004年 | 1326篇 |
2003年 | 1004篇 |
2002年 | 912篇 |
2001年 | 778篇 |
2000年 | 696篇 |
1999年 | 593篇 |
1998年 | 391篇 |
1997年 | 331篇 |
1996年 | 301篇 |
1995年 | 237篇 |
1994年 | 200篇 |
1993年 | 120篇 |
1992年 | 100篇 |
1991年 | 78篇 |
1990年 | 55篇 |
1989年 | 41篇 |
1988年 | 34篇 |
1987年 | 24篇 |
1986年 | 32篇 |
1985年 | 10篇 |
1984年 | 6篇 |
1982年 | 11篇 |
1981年 | 6篇 |
1980年 | 11篇 |
1979年 | 11篇 |
1977年 | 1篇 |
1975年 | 1篇 |
1973年 | 1篇 |
1959年 | 7篇 |
1951年 | 7篇 |
排序方式: 共有10000条查询结果,搜索用时 15 毫秒
81.
Jinting Jiu Seiji Isoda Motonari Adachi Hao Wang 《Journal of Materials Science: Materials in Electronics》2007,18(6):593-597
Nanocrystalline TiO2 with 3–10 nm in diameter was prepared with a surfactant-template method. Dye-sensitized solar cells were assembled using
the prepared nanocrystalline TiO2 with large surface area and high crystallinity, which achieved significant higher Jsc when compared to cells fabricated with
bigger particles of 25 nm in diameter. In the cells with nanocrystalline TiO2, the sintering temperature drastically affected the conversion performance of the cells. 相似文献
82.
83.
84.
Y. L. Hao R. Yang M. Niinomi D. Kuroda Y. L. Zhou K. Fukunaga A. Suzuki 《Metallurgical and Materials Transactions A》2003,34(4):1007-1012
Alloys for implant devices require improved strength but a reduced Young’s modulus, in order to become mechanically more compatible
with adjacent bone tissues. In this study, a new metastable β-type titanium alloy, Ti-29Nb-13Ta-4.6Zr (wt pct), was subjected to aging treatment to produce different microstructures,
and the resulting mechanical properties, including the Young’s modulus, were measured. The Young’s modulus of this alloy is
found to be sensitive to microstructures generated by various heat treatments. For microstructures varying from (α + β) to (α + β + ω) and (β + ω), the Young’s modulus increases with an accompanying increase in tensile strength and hardness, but decreases in ductility.
The (β + ω) microstructure has a low strength, high modulus, and poor ductility and cannot be used for biomedical applications. For
an (α + β) microstructure, the volume fraction of the phases is shown to be the main factor that determines the mechanical properties. 相似文献
85.
86.
Yanqing Ji Hao Ying John Yen Shizhuo Zhu Daniel C. Barth‐Jones Richard E. Miller R. Michael Massanari 《国际智能系统杂志》2007,22(8):827-845
Discovering unknown adverse drug reactions (ADRs) in postmarketing surveillance as early as possible is highly desirable. Nevertheless, current postmarketing surveillance methods largely rely on spontaneous reports that suffer from serious underreporting, latency, and inconsistent reporting. Thus these methods are not ideal for rapidly identifying rare ADRs. The multiagent systems paradigm is an emerging and effective approach to tackling distributed problems, especially when data sources and knowledge are geographically located in different places and coordination and collaboration are necessary for decision making. In this article, we propose an active, multiagent framework for early detection of ADRs by utilizing electronic patient data distributed across many different sources and locations. In this framework, intelligent agents assist a team of experts based on the well‐known human decision‐making model called Recognition‐Primed Decision (RPD). We generalize the RPD model to a fuzzy RPD model and utilize fuzzy logic technology to not only represent, interpret, and compute imprecise and subjective cues that are commonly encountered in the ADR problem but also to retrieve prior experiences by evaluating the extent of matching between the current situation and a past experience. We describe our preliminary multiagent system design and illustrate its potential benefits for assisting expert teams in early detection of previously unknown ADRs. © 2007 Wiley Periodicals, Inc. Int J Int Syst 22: 827–845, 2007. 相似文献
87.
88.
89.
低云中短波红外表观辐射模型研究 总被引:2,自引:1,他引:1
在对空红外系统的多光谱探测和红外仿真中,云的干扰不可忽略,所以,对云的辐射特性的研究至关重要。在不同的波段,云的辐射特性会有很大的差异,为了研究各个不同波段云的表现辐射特性.需要计算云的光谱辐射量。在典型观测模式下建立了低云的表观光谱辐射模型,研究了对云背景辐射有贡献的各个辐射分量的计算方法。基于传统的二流近似模型获取各个参数,引入云的光谱光学厚度的经验公式。进而获得了低云在中短波段的光谱辐射特性,有效地计算出了云背景在1-5μm的中短波段内的表现光谱辐亮度数据,并且节省了计算时间。经过比较发现,该模型的计算结果与实测结果有较好的一致性。可以为云背景多光谱分析、探测及仿真提供背景数据。 相似文献
90.
Hao Chen 《IEEE transactions on information theory / Professional Technical Group on Information Theory》2005,51(5):1854-1856
We prove a result which reduces the computation of the linear complexity of a sequence over GF(pm) (p is an odd prime) with period 2n (n is a positive integer such that there exists an element bisinGF(pm), bn=-1) to the computation of the linear complexities of two sequences with period n. By combining with some known algorithms such as the Berlekamp-Massey algorithm and the Games-Chan algorithm we can determine the linear complexity of any sequence over GF(pm) with period 2tn (such that 2 t|pm-1 and gcd(n,pm-1)=1) more efficiently 相似文献