全文获取类型
收费全文 | 253篇 |
免费 | 5篇 |
专业分类
教育 | 159篇 |
科学研究 | 55篇 |
各国文化 | 6篇 |
体育 | 11篇 |
文化理论 | 4篇 |
信息传播 | 23篇 |
出版年
2021年 | 5篇 |
2020年 | 7篇 |
2019年 | 6篇 |
2018年 | 8篇 |
2017年 | 9篇 |
2016年 | 6篇 |
2015年 | 4篇 |
2014年 | 9篇 |
2013年 | 74篇 |
2012年 | 5篇 |
2011年 | 2篇 |
2010年 | 5篇 |
2009年 | 4篇 |
2008年 | 2篇 |
2007年 | 3篇 |
2006年 | 3篇 |
2005年 | 5篇 |
2004年 | 5篇 |
2003年 | 2篇 |
2002年 | 3篇 |
2001年 | 4篇 |
2000年 | 2篇 |
1997年 | 3篇 |
1994年 | 3篇 |
1993年 | 3篇 |
1992年 | 3篇 |
1991年 | 2篇 |
1990年 | 2篇 |
1987年 | 4篇 |
1986年 | 2篇 |
1984年 | 4篇 |
1982年 | 2篇 |
1978年 | 3篇 |
1974年 | 4篇 |
1969年 | 2篇 |
1962年 | 2篇 |
1961年 | 2篇 |
1925年 | 2篇 |
1922年 | 1篇 |
1921年 | 1篇 |
1920年 | 1篇 |
1919年 | 1篇 |
1918年 | 2篇 |
1910年 | 1篇 |
1908年 | 3篇 |
1905年 | 2篇 |
1900年 | 1篇 |
1895年 | 1篇 |
1890年 | 5篇 |
1889年 | 8篇 |
排序方式: 共有258条查询结果,搜索用时 31 毫秒
81.
82.
83.
84.
85.
Edgar Scavino Dzuraidah Abdul Wahab Aini Hussain Hassan Basri Mohd Marzuki Mustafa 《浙江大学学报(A卷英文版)》2009,10(6):794-799
An experimental machine vision apparatus was used to identify and extract recyclable plastic bottles out of a conveyor belt. Color images were taken with a commercially available Webcam, and the recognition was performed by our homemade software, based on the shape and dimensions of object images. The software was able to manage multiple bottles in a single image and was additionally extended to cases involving touching bottles. The identification was fulfilled by comparing the set of measured features with an existing database and meanwhile integrating various recognition techniques such as minimum distance in the feature space, self-organized maps, and neural networks. The recognition system was tested on a set of 50 different bottles and provided so far an accuracy of about 97% on bottle identification. The extraction of the bottles was performed by means of a pneumatic arm, which was activated according to the plastic type; polyethylene-terephthalate (PET) bottles were left on the conveyor belt, while non-PET bottles were extracted. The software was designed to provide the best compromise between reliability and speed for real-time applications in view of the commercialization of the system at existing recycling plants. 相似文献
86.
Tracy L. Kivell Sara K. Doyle Richard H. Madden Terry L. Mitchell Ershela L. Sims 《Anatomical sciences education》2009,2(4):173-178
Much research has shown the benefits of additional anatomical learning and dissection beyond the first year of medical school human gross anatomy, all the way through postgraduate medical training. We have developed an interactive method for teaching eye and orbit anatomy to medical students in their ophthalmology rotation at Duke University School of Medicine. We provide review lectures on the detailed anatomy of the adult human eye and orbit as well as the developmental anatomy of the eye. These lectures are followed by a demonstration of the anatomy of the orbit using conventional frontal and superior exposures on a prosected human cadaver. The anatomy is projected onto a large LCD screen using a mounted overhead camera. Following a brief lecture on clinically relevant anatomy, each student then dissects a fresh porcine (pig) eye under low magnification using a dissecting microscope. These dissections serve to identify structures extrinsic to the eyeball, including extraocular muscle attachments, small vessels, optic nerve stalk, and fascial sheath of the eyeball (Tenon's fascia). Dissection then shifts to the internal anatomy of the eyeball. The size and anatomy of the porcine eye is comparable with that of the human and the dissection provides students with a valuable hands‐on learning opportunity that is otherwise not available in embalmed human cadavers. Students and clinical faculty feedback reveal high levels of satisfaction with the presentation of anatomy and its scheduling early during the ophthalmology clerkship. Anat Sci Educ 2:173–178, 2009. © 2009 American Association of Anatomists. 相似文献
87.
88.
89.
90.