全文获取类型
| 收费全文 | 2507篇 |
| 免费 | 50篇 |
| 国内免费 | 3篇 |
专业分类
| 教育 | 1762篇 |
| 科学研究 | 182篇 |
| 各国文化 | 57篇 |
| 体育 | 249篇 |
| 综合类 | 2篇 |
| 文化理论 | 34篇 |
| 信息传播 | 274篇 |
出版年
| 2023年 | 10篇 |
| 2022年 | 11篇 |
| 2021年 | 29篇 |
| 2020年 | 44篇 |
| 2019年 | 67篇 |
| 2018年 | 135篇 |
| 2017年 | 115篇 |
| 2016年 | 109篇 |
| 2015年 | 78篇 |
| 2014年 | 89篇 |
| 2013年 | 569篇 |
| 2012年 | 87篇 |
| 2011年 | 81篇 |
| 2010年 | 68篇 |
| 2009年 | 69篇 |
| 2008年 | 68篇 |
| 2007年 | 59篇 |
| 2006年 | 47篇 |
| 2005年 | 52篇 |
| 2004年 | 48篇 |
| 2003年 | 42篇 |
| 2002年 | 41篇 |
| 2001年 | 26篇 |
| 2000年 | 42篇 |
| 1999年 | 28篇 |
| 1998年 | 29篇 |
| 1997年 | 29篇 |
| 1996年 | 29篇 |
| 1995年 | 33篇 |
| 1994年 | 26篇 |
| 1993年 | 34篇 |
| 1992年 | 17篇 |
| 1991年 | 14篇 |
| 1990年 | 29篇 |
| 1989年 | 15篇 |
| 1988年 | 19篇 |
| 1987年 | 20篇 |
| 1986年 | 13篇 |
| 1985年 | 19篇 |
| 1984年 | 24篇 |
| 1983年 | 15篇 |
| 1982年 | 12篇 |
| 1981年 | 16篇 |
| 1980年 | 16篇 |
| 1979年 | 10篇 |
| 1978年 | 14篇 |
| 1977年 | 9篇 |
| 1974年 | 9篇 |
| 1973年 | 8篇 |
| 1969年 | 8篇 |
排序方式： 共有2560条查询结果，搜索用时 250 毫秒
11.
12.
13.
14.
15.
16.
17.
Software engineering education can be viewed as a challenging task. Computer science students tend to focus on the programming aspects of a project, and take a “hacking approach” to completing a project, rather than viewing the process. Our course material includes teaching the Personal Software Process (PSP). Students are required to produce defect and effort metrics, as well as project summary reports. Tools to assist information recording and production of reports are difficult for students to access. The cost in terms of financial and learning time is usually too high at the educational level to justify using commercial tools that are available for the professional software engineer. We have developed a tool—Personal Assistant for Software Engineers—to aid students in the learning of the PSP. The tool has been successfully used in four subjects for a semester. Following feedback and evaluation, it has been redesigned, and is currently in stage two. The tool has been useful for students, and has automated the previous manual process of producing time and defect reports, along with project summaries, thus allowing them to focus on the meaning of the information. 相似文献
18.
19.
20.
Birgit Angelika Schmidt Martin Andreas Ziemann Simone Pentzien Toralf Gabsch Werner Koch Jörg Krüger 《文物保护研究》2016,61(2):113-122
A great number of Central Asian wall paintings, archeological materials, architectural fragments, and textiles, as well as painting fragments on silk and paper, make up the so called Turfan Collection at the Asian Art Museum in Berlin. The largest part of the collection comes from the Kucha region, a very important cultural center in the third to ninth centuries. Between 1902 and 1914, four German expeditions traveled along the northern Silk Road. During these expeditions, wall paintings were detached from their original settings in Buddhist cave complexes. This paper reports a technical study of a wall painting, existing in eight fragments, from the Buddhist cave no. 40 (Ritterhöhle). Its original painted surface is soot blackened and largely illegible. Grünwedel, leader of the first and third expeditions, described the almost complete destruction of the rediscovered temple complex and evidence of fire damage. The aim of this case study is to identify the materials used for the wall paintings. Furthermore, soot deposits as well as materials from conservation interventions were of interest. Non-invasive analyses were preferred but a limited number of samples were taken to provide more precise information on the painting technique. By employing optical and scanning electron microscopy, energy dispersive X-ray spectroscopy, micro X-ray fluorescence spectroscopy, X-ray diffraction analysis, and Raman spectroscopy, a layer sequence of earthen render, a ground layer made of gypsum, and a paint layer containing a variety of inorganic pigments were identified. 相似文献