全文获取类型
| 收费全文 | 10259篇 |
| 免费 | 59篇 |
| 国内免费 | 124篇 |
专业分类
| 教育 | 6501篇 |
| 科学研究 | 1238篇 |
| 各国文化 | 92篇 |
| 体育 | 1638篇 |
| 综合类 | 18篇 |
| 文化理论 | 66篇 |
| 信息传播 | 889篇 |
出版年
| 2021年 | 87篇 |
| 2020年 | 167篇 |
| 2019年 | 208篇 |
| 2018年 | 281篇 |
| 2017年 | 280篇 |
| 2016年 | 268篇 |
| 2015年 | 189篇 |
| 2014年 | 239篇 |
| 2013年 | 1565篇 |
| 2012年 | 213篇 |
| 2011年 | 226篇 |
| 2010年 | 190篇 |
| 2009年 | 209篇 |
| 2008年 | 190篇 |
| 2007年 | 184篇 |
| 2006年 | 199篇 |
| 2005年 | 173篇 |
| 2004年 | 380篇 |
| 2003年 | 349篇 |
| 2002年 | 337篇 |
| 2001年 | 401篇 |
| 2000年 | 240篇 |
| 1999年 | 162篇 |
| 1998年 | 106篇 |
| 1997年 | 97篇 |
| 1996年 | 96篇 |
| 1995年 | 107篇 |
| 1994年 | 101篇 |
| 1993年 | 77篇 |
| 1992年 | 152篇 |
| 1991年 | 118篇 |
| 1990年 | 135篇 |
| 1989年 | 149篇 |
| 1988年 | 110篇 |
| 1987年 | 129篇 |
| 1986年 | 120篇 |
| 1985年 | 136篇 |
| 1984年 | 120篇 |
| 1983年 | 123篇 |
| 1982年 | 96篇 |
| 1981年 | 83篇 |
| 1980年 | 90篇 |
| 1979年 | 134篇 |
| 1978年 | 88篇 |
| 1977年 | 72篇 |
| 1976年 | 90篇 |
| 1975年 | 66篇 |
| 1974年 | 72篇 |
| 1973年 | 68篇 |
| 1971年 | 67篇 |
排序方式： 共有10000条查询结果，搜索用时 0 毫秒
961.
Michelle D. Lazarus Gordon L. Kauffman Jr. Milind J. Kothari Timothy J. Mosher Matthew L. Silvis John R. Wawrzyniak Daniel T. Anderson Kevin P. Black 《Anatomical sciences education》2014,7(5):379-388
Current undergraduate medical school curricular trends focus on both vertical integration of clinical knowledge into the traditionally basic science‐dedicated curricula and increasing basic science education in the clinical years. This latter type of integration is more difficult and less reported on than the former. Here, we present an outline of a course wherein the primary learning and teaching objective is to integrate basic science anatomy knowledge with clinical education. The course was developed through collaboration by a multi‐specialist course development team (composed of both basic scientists and physicians) and was founded in current adult learning theories. The course was designed to be widely applicable to multiple future specialties, using current published reports regarding the topics and clinical care areas relying heavily on anatomical knowledge regardless of specialist focus. To this end, the course focuses on the role of anatomy in the diagnosis and treatment of frequently encountered musculoskeletal conditions. Our iterative implementation and action research approach to this course development has yielded a curricular template for anatomy integration into clinical years. Key components for successful implementation of these types of courses, including content topic sequence, the faculty development team, learning approaches, and hidden curricula, were developed. We also report preliminary feedback from course stakeholders and lessons learned through the process. The purpose of this report is to enhance the current literature regarding basic science integration in the clinical years of medical school. Anat Sci Educ 7: 379–388. © 2014 American Association of Anatomists. 相似文献
962.
963.
Ivan Bradaric Athina P. Petropulu Konstantinos I. Diamantaras 《Journal of The Franklin Institute》2002,339(2):161-187
Higher-order statistics (HOS) are well known for their robustness to additive Gaussian noise and ability to preserve phase. HOS estimates, on the other hand, have been criticized for high complexity and the need for long data in order to maintain small variance. Since rank reduction offers a general principle for reduction of estimator variance and complexity, we consider the problem of designing low-rank estimators for HOS. We propose three methods for choosing the transformation matrix that reduces the mean-square error (MSE) associated with the low-rank HOS estimates. We also demonstrate the advantages of using low-rank third-order moment estimates for blind system estimation. Results indicate that the full rank MSE corresponding to some data length N can be attained by a low-rank estimator corresponding to a length significantly smaller than N. 相似文献
964.
H.C. Reddy C.P. Reddy M.N.S. Swamy V. Ramachandran 《Journal of The Franklin Institute》1982,313(4):197-206
In this paper a method for the realization of RC transfer immittance functions with an unsymmetrical lattice is presented. The method yields minimal capacitor realizations for Z12(s) with no pole at s = 0 and ?y12(s) having no pole at s = ∞. The number of resistors needed are only two more than the minimum needed. 相似文献
965.
LUO Guang ZHOU Shang-qi HAN Zhong CHEN Shuang-kou 《重庆大学学报(英文版)》2006,5(4):193-199
1 Introduction a Compton scattering is well known, and its applications are studied by physicists, chemists and specialists in many fields. Some applications are relatively mature and relevant instruments have been developed such as ComScan; whereas the o… 相似文献
966.
卢义玉 《重庆大学学报(英文版)》2003,2(1)
~~00002RKRSr= (6) If 0tKt=, Eqs. (2),(3) and (4) change into the following equation that is applied to simulations using the MathCAD software. ddd(,,)dd1dxyygxyzzttt=== (7) where 11251(,,)()(1)gxyzABCyxaaaa=++-+, 2132131145678222124531678831(1),23(1)[(1sin],[3cos()] AyyByxxyxzCxyxyxyxzggaaaaaaaaaaaaagaaaa-------=--=++---+=+-- (8) 5g00pK6g0p… 相似文献
967.
陈德淑 《重庆大学学报(英文版)》2003,2(2)
1. Introduction At present, it is necessary to use fertilizer to ensure the stable and high agricultural productivity. However, as we all know, the fertilizer not only decreases the self-fertility of soil, but also is accompanied with pesticide. Food poisoning caused by remnant pesticide in fruits and vegetables is often reported, and in such cases, chronic poisoning is the majority. The remnant pesticide accumulates in body gradually, and then induces kinds of disease. As reported, the Miyu… 相似文献
968.
马勇 《重庆大学学报(英文版)》2003,2(1)
1. Introduction SnO2 is an n-type semiconductor with rutile crystal structure and with a wide band gap of about 3.6 eV. SnO2 has a wide range of applications as photo-detectors, heat mirrors, transparent electrodes for solar cells, conductive filler, thick resistors, catalysts and gas sensors. One of the most important applications of SnO2 lies in gas sensors [1]. SnO2 gas sensors have been attracting much attention [2-5] because of their many advantages over current technologies for detect… 相似文献
969.
A fractal approximation algorithm for inverse initial-value problems of nonlinear differential equations 总被引：1，自引：0，他引：1
唐艳 《重庆大学学报(英文版)》2003,2(2)
1. Introduction Initial-value problems (IVP) for the differential equations are often confronted with in many fields of science, and are particularly common in engineering. These problems are characterized by a governing differential equation and its associated initial conditions. Methods for solving direct IVP have been known for many decades in the area of differential equation. A few of the more popular methods of solution have proven to provide sufficient and even efficient mechanisms … 相似文献
970.
The subject of this work is the assessment on the stability of an excavated high slope in order to insure the security of the building site adjacent to the slope,which is frequently encountered in town construction in mountainous areas due to terrain limit.On the base of some typical engineering cases in Chongqing,several crucial problems on security assessment of building site adjacent to an excavated high slope,including the natural geological conditions and man-destroyed degree,engineering environment,potential failure pattern of the high slope,calculation parameters and analysis methods,are roundly discussed.It is demonstrated that the conclusion of security assessment can be determined according to the aspects above-mentioned,and the security assessment is one of the fundamental data to insure the safety of the related construction,site and buildings. 相似文献