全文获取类型
收费全文 | 20250篇 |
免费 | 173篇 |
国内免费 | 304篇 |
专业分类
系统科学 | 258篇 |
丛书文集 | 354篇 |
教育与普及 | 182篇 |
理论与方法论 | 86篇 |
现状及发展 | 6199篇 |
研究方法 | 799篇 |
综合类 | 12564篇 |
自然研究 | 285篇 |
出版年
2015年 | 198篇 |
2014年 | 256篇 |
2013年 | 314篇 |
2012年 | 503篇 |
2011年 | 760篇 |
2010年 | 344篇 |
2009年 | 303篇 |
2008年 | 598篇 |
2007年 | 546篇 |
2006年 | 524篇 |
2005年 | 496篇 |
2004年 | 456篇 |
2003年 | 430篇 |
2002年 | 447篇 |
2001年 | 641篇 |
2000年 | 578篇 |
1999年 | 525篇 |
1998年 | 218篇 |
1997年 | 215篇 |
1996年 | 239篇 |
1995年 | 213篇 |
1994年 | 193篇 |
1992年 | 353篇 |
1991年 | 281篇 |
1990年 | 299篇 |
1989年 | 296篇 |
1988年 | 296篇 |
1987年 | 256篇 |
1986年 | 223篇 |
1985年 | 301篇 |
1984年 | 231篇 |
1979年 | 418篇 |
1978年 | 309篇 |
1977年 | 307篇 |
1976年 | 289篇 |
1975年 | 323篇 |
1974年 | 385篇 |
1973年 | 365篇 |
1972年 | 379篇 |
1971年 | 434篇 |
1970年 | 550篇 |
1969年 | 462篇 |
1968年 | 469篇 |
1967年 | 431篇 |
1966年 | 383篇 |
1965年 | 285篇 |
1958年 | 297篇 |
1957年 | 199篇 |
1956年 | 185篇 |
1954年 | 185篇 |
排序方式: 共有10000条查询结果,搜索用时 22 毫秒
91.
E. Schraufstätter 《Cellular and molecular life sciences : CMLS》1948,4(12):484-486
Summary Chalcone, flavanone, flavone, and its derivatives had a certain bacteriostatic effect onSt. aureus. Flavonol has no activity and morin, a derivative of flavonol, showed only a weak inhibition of the bacterial growth.Cystein did not have any antagonistic effect.Extracts of drugs, which contain natural flavanones, flavones, isoflavones and flavonols, are more or less bacteriostatic. 相似文献
92.
93.
94.
Hong Zhang Kui Zhang Ying Mu Ning Yao Robert J. Sclabassi Mingui Sun 《自然科学进展(英文版)》2008,18(12):1507-1512
Image-based gait analysis as a means of biometric identification has attracted much research attention. Most of the existing methods focus on human identification, posture analysis and movement tracking. There have been few investigations on measuring the carried load based on the carrier's gait characteristics by automatic image processing. Nevertheless, this measurement is very useful in a number of applications, such as the study of the carried load on the postural development of children and adolescence. In this paper, we investigate how to automatically estimate the carried weight from a sequence of images. We present a method to extract human gait silhouette based on an observation that humans tend to minimize the energy during motion. We compute several angles of body leaning and determine the relationship of the carried weight, the leaning angles and the centroid location according to a human kinetic study. Our weight determination method has been verified successfully by experiments. 相似文献
95.
The venoms of predatory cone snails harbor a rich repertoire of peptide toxins that are valuable research tools, but recently
have also proven to be useful drugs. Among the conotoxins with several disulfide bridges, the O-superfamily toxins are characterized
by a conserved cysteine knot pattern: C-C-CC-C-C. While ω-conotoxins and κ-conotoxins block Ca2+ and K+ channels, respectively, the closely related δ- and μO-conotoxins affect voltage-gated Na+ channels (Nav channels). δ-conotoxins mainly remove the fast inactivation of Nav channels and, thus, functionally resemble long-chain scorpion α-toxins. μO-conotoxins are functionally similar to μ-conotoxins,
since they inhibit the ion flow through Nav channels. Recent results from functional and structural assays have gained insight into the underlying molecular mechanisms.
Both types of toxins are voltage-sensor toxins interfering with the voltage-sensor elements of Nav channels.
Received 27 December 2006; received after revision 30 January 2007; accepted 19 February 2007 相似文献
96.
本文根据井壁结构模型试验结果,对目前具有代表性的复杂应力状态下的砼强度准则进行了分析和对比,找到了一种比较适合于井壁结构的砼强度准则,从而为井壁结构承载能力的合理计算提供了理论基础. 相似文献
97.
98.
J E Landegent N Jansen in de Wal G J van Ommen F Baas J J de Vijlder P van Duijn M Van der Ploeg 《Nature》1985,317(6033):175-177
During the past few years, several methods have been developed for the detection of specific nucleic acid sequences by in situ hybridization using non-radioactive labels such as fluorochromes, cytochemically detectable enzymes and electron-dense markers. These methods are preferable to autoradiography in terms of speed of performance and topological resolution. Their limited sensitivity, however, has so far restricted their use to the detection of repeated sequences. Here we report single gene detection with a procedure using 2-acetylaminofluorene (AAF)-modified probes, immunoperoxidase cytochemistry and reflection-contrast microscopy. We confirmed the autoradiographic data on the localization of the human thyroglobulin (Tg) gene to the distal end of the long arm of chromosome 8. A mixture of cosmid cHT2-derived subclones of the 3' part of the Tg gene, 22.3 kilobase pairs (kbp) in total, was used as a hybridization probe. This procedure can be used to map other unique sequences, if genomic clones are available from which clones with an appropriate amount of inserts can be isolated. 相似文献
99.
电子耳蜗是一项正在迅速发展的聋人康复新技术,其关键是要研制出可靠、灵活、价格低廉的产品。首先介绍电子耳蜗的原理及其进展,然后介绍基于TMS320VC5402 DSP处理器的电子耳蜗语音处理器。实验证明:基于DSP的电子耳蜗系统可以按照患者的实际情况灵活选择各种语音处理方案,并能方便实现语音预处理、噪声抑制和对应各电极的频谱阈值调整,是一种比较好的系统结构。 相似文献
100.
论微观辨证 总被引:7,自引:0,他引:7
郭尧杰 《厦门大学学报(自然科学版)》2002,41(4):512-516
探讨了在中、西医理论不同的前提下,如何合理选择应用现代检测项目作为辩证的指标,并提出微观辩证的新概念。 相似文献