全文获取类型
收费全文 | 657篇 |
免费 | 92篇 |
专业分类
电工技术 | 3篇 |
综合类 | 11篇 |
化学工业 | 262篇 |
金属工艺 | 5篇 |
机械仪表 | 11篇 |
建筑科学 | 31篇 |
矿业工程 | 10篇 |
能源动力 | 32篇 |
轻工业 | 77篇 |
水利工程 | 4篇 |
石油天然气 | 1篇 |
无线电 | 41篇 |
一般工业技术 | 132篇 |
冶金工业 | 22篇 |
原子能技术 | 2篇 |
自动化技术 | 105篇 |
出版年
2024年 | 1篇 |
2023年 | 35篇 |
2022年 | 18篇 |
2021年 | 78篇 |
2020年 | 29篇 |
2019年 | 36篇 |
2018年 | 29篇 |
2017年 | 32篇 |
2016年 | 36篇 |
2015年 | 50篇 |
2014年 | 49篇 |
2013年 | 48篇 |
2012年 | 52篇 |
2011年 | 66篇 |
2010年 | 36篇 |
2009年 | 39篇 |
2008年 | 25篇 |
2007年 | 20篇 |
2006年 | 8篇 |
2005年 | 14篇 |
2004年 | 6篇 |
2003年 | 7篇 |
2002年 | 3篇 |
2001年 | 7篇 |
2000年 | 3篇 |
1999年 | 4篇 |
1998年 | 3篇 |
1997年 | 2篇 |
1996年 | 3篇 |
1995年 | 1篇 |
1994年 | 4篇 |
1993年 | 1篇 |
1992年 | 1篇 |
1991年 | 1篇 |
1989年 | 1篇 |
1936年 | 1篇 |
排序方式: 共有749条查询结果,搜索用时 15 毫秒
121.
122.
123.
Humidity Sensors: Lithium Tin Sulfide—a High‐Refractive‐Index 2D Material for Humidity‐Responsive Photonic Crystals (Adv. Funct. Mater. 14/2018)
下载免费PDF全文
![点击此处可从《Advanced functional materials》网站下载免费的PDF全文](/ch/ext_images/free.gif)
124.
125.
Hydrogels: Near‐Infrared Light‐Sensitive Polyvinyl Alcohol Hydrogel Photoresist for Spatiotemporal Control of Cell‐Instructive 3D Microenvironments (Adv. Mater. 10/2018)
下载免费PDF全文
![点击此处可从《Advanced materials (Deerfield Beach, Fla.)》网站下载免费的PDF全文](/ch/ext_images/free.gif)
126.
127.
Effects of task experience and layout on learning from text and pictures with or without unnecessary picture descriptions
下载免费PDF全文
![点击此处可从《Journal of Computer Assisted Learning》网站下载免费的PDF全文](/ch/ext_images/free.gif)
Gertjan Rop Anne Schüler Peter P.J.L. Verkoeijen Katharina Scheiter Tamara van Gog 《Journal of Computer Assisted Learning》2018,34(4):458-470
The presentation of extraneous (i.e., irrelevant or unnecessary) information may hamper learning with multimedia. The present study examined whether people can learn to ignore unnecessary information with increasing experience with the task and whether this depends on the layout of that information. In two experiments, participants learned about the process of mitosis from a multimedia slideshow, with each slide presenting a combination of expository text and a picture on one of the stages in the process. Slides either contained no unnecessary text (control condition) or unnecessary text (i.e., merely describing the picture) either integrated in the picture (integrated condition) or presented underneath the picture (separated condition). Knowledge about the studied mitosis phase was tested immediately after each slide using a cloze test. Across Experiments 1 and 2, we did not find a reliable negative effect of the unnecessary text on cloze test performance. As a result, the question of whether task experience would reduce or eliminate that negative effect could not be answered. The eye movement data did confirm, however, that participants attended less to the unnecessary information with increasing task experience, suggesting that students can adapt their study strategy and learn to ignore unnecessary information. 相似文献
128.
Dennis R. Bukenberger Katharina Schwarz Hendrik P. A. Lensch 《Computer Graphics Forum》2018,37(1):301-312
Notebook scribbles, art or technical illustrations—line drawings are a simplistic method to visually communicate information. Automated line drawings often originate from virtual 3D models, but one cannot trivially experience their three‐dimensionality. This paper introduces a novel concept to produce stereo‐consistent line drawings of virtual 3D objects. Some contour lines do not only depend on an objects geometry, but also on the position of the observer. To accomplish consistency between multiple view positions, our approach exploits geometrical characteristics of 3D surfaces in object space. Established techniques for stereo‐consistent line drawings operate on rendered pixel images. In contrast, our pipeline operates in object space using vector geometry, which yields many advantages: The position of the final viewpoint(s) is flexible within a certain window even after the contour generation, e.g. a stereoscopic image pair is only one possible application. Such windows can be concatenated to simulate contours observed from an arbitrary camera path. Various types of popular contour generators can be handled equivalently, occlusions are natively supported and stylization based on geometry characteristics is also easily possible. 相似文献
129.
130.
Vu Thanh Cong Wenqian Wang Richard D. Tilley George Sharbeen Phoebe A. Phillips Katharina Gaus John Justin Gooding 《Advanced functional materials》2021,31(32):2007880
Macropinocytosis is a consequence of oncogenic alterations of cancer cells while most healthy cells are non-macropinocytic. It is currently unclear whether macropinocytic cancer cells can be targeted rather than healthy cells, by adjusting the shape and size of nanoparticles. Herein, the endocytosis of two differently shaped nanoparticles; nanorods and nanospheres are compared in cancer and healthy cells. The cells are breast epithelial cancer cells (MCF7) and breast epithelial healthy cells (MCF10A) and pancreas cancer cells (PANC-1 cells) and non-tumourogenic patient-derived cancer-associated fibroblasts (CAFs). The endocytosis pathway is quantified by a combination of pair correlation microscopy and endocytosis inhibitors. MCF7 cells use clathrin-mediated endocytosis and macropinocytosis to take up the nanorods while MCF10A cells use predominantly clathrin-mediated endocytosis. Based on the comparison of endocytic behavior of cancer and healthy cells, MCF7 cells can be induced to take up more nanorods and suppress the metabolism and endocytosis of nanorods in MCF10A cells. The nanorods allow targeting to breast cancer MCF7 cells and pancreas cancer cells over the healthy cells. This study opens exciting possibilities for shape to target the cancer cells over healthy cells, by adjusting nanoparticle shape. 相似文献