全文获取类型
收费全文 | 1027篇 |
免费 | 362篇 |
国内免费 | 41篇 |
专业分类
电工技术 | 73篇 |
综合类 | 33篇 |
化学工业 | 295篇 |
金属工艺 | 15篇 |
机械仪表 | 25篇 |
建筑科学 | 26篇 |
矿业工程 | 4篇 |
能源动力 | 19篇 |
轻工业 | 31篇 |
水利工程 | 3篇 |
石油天然气 | 18篇 |
武器工业 | 4篇 |
无线电 | 361篇 |
一般工业技术 | 460篇 |
冶金工业 | 20篇 |
原子能技术 | 17篇 |
自动化技术 | 26篇 |
出版年
2024年 | 7篇 |
2023年 | 28篇 |
2022年 | 18篇 |
2021年 | 49篇 |
2020年 | 92篇 |
2019年 | 107篇 |
2018年 | 93篇 |
2017年 | 108篇 |
2016年 | 76篇 |
2015年 | 109篇 |
2014年 | 108篇 |
2013年 | 89篇 |
2012年 | 76篇 |
2011年 | 74篇 |
2010年 | 55篇 |
2009年 | 41篇 |
2008年 | 62篇 |
2007年 | 49篇 |
2006年 | 41篇 |
2005年 | 36篇 |
2004年 | 26篇 |
2003年 | 15篇 |
2002年 | 16篇 |
2001年 | 9篇 |
2000年 | 11篇 |
1999年 | 12篇 |
1998年 | 6篇 |
1997年 | 5篇 |
1996年 | 3篇 |
1994年 | 5篇 |
1992年 | 2篇 |
1987年 | 1篇 |
1974年 | 1篇 |
排序方式: 共有1430条查询结果,搜索用时 15 毫秒
91.
92.
93.
The emerging professional adhocracy: A general framework of responsive organizing (a republication).
This reprinted article originally appeared in Consulting Psychology Journal: Practice and Research, 1997, Vol 49(1), 25-34. (The following abstract of the original article appeared in record 1997-30041-003.) Offers a framework of the characteristics of the responsive organization. A responsive organization is one in which structures and procedures enhance the organization's ability to take advantage of the changes in the environment. Responsiveness, in this case, is more than just being reactive; it means that an organization is able to anticipate change and maintain a proactive orientation to the external environment. Within the framework discussed, the authors also include some of the problems that might be expected in this new organizational form. It is suggested that these tools will allow for the systematic examination of organizational performance and assist change agents in facilitating efforts intended to result in more responsive organizing. (PsycINFO Database Record (c) 2010 APA, all rights reserved) 相似文献
94.
95.
Chih-Yu Kuo Ting-Yu Liu Andri Hardiansyah Chia-Fen Lee Man-Sheng Wang Wen-Yen Chiu 《Nanoscale research letters》2014,9(1):520
In the present work, we prepare thermo- and pH-sensitive polymer-based nanoparticles incorporating with magnetic iron oxide as the remote-controlled, stimuli-response nanocarriers. Well-defined, dual functional tri-block copolymer poly[(acrylic acid)-block-(N-isopropylacrylamide)-block-(acrylic acid)], was synthesized via reversible addition-fragmentation chain-transfer (RAFT) polymerization with S,S′-bis(α,α′-dimethyl-α″-acetic acid)trithiocarbonate (CMP) as a chain transfer agent (CTA). With the aid of using 3-aminopropyltriethoxysilane, the surface-modified iron oxides, Fe3O4-NH2, was then attached on the surface of self-assembled tri-block copolymer micelles via 1-[3-(dimethylamino)propyl]-3-ethylcarbodiimide hydrochloride/N-hydroxysuccinamide (EDC/NHS) crosslinking method in order to furnish not only the magnetic resources for remote control but also the structure maintenance for spherical morphology of our nanocarriers. The nanocarrier was characterized by transmission electron microscope (TEM), Fourier transform infrared spectroscopy (FT-IR), and ultraviolet–visible (UV/Vis) spectral analysis. Rhodamine 6G (R6G), as the modeling drugs, was encapsulated into the magnetic nanocarriers by a simple swelling method for fluorescence-labeling and controlled release monitoring. Biocompatibility of the nanocarriers was studied via 3-(4,5-dimethylthiazol-2-yl)-2,5-diphenyltetrazolium bromide (MTT) assay, which revealed that neither the pristine nanocarrier nor the R6G-loaded nanocarriers were cytotoxic to the normal fibroblast cells (L-929 cells). The in vitro stimuli-triggered release measurement showed that the intelligent nanocarriers were highly sensitive to the change of pH value and temperature rising by the high-frequency magnetic field (HFMF) treatment, which provided the significant potential to apply this technology to biomedical therapy by stimuli-responsive controlled release. 相似文献
96.
Hongzhuo Liu Liang Feng Gaurav Tolia Mark R. Liddell Jinsong Hao 《Drug development and industrial pharmacy》2014,40(7):896-903
A convenient and efficient in vitro diffusion cell method to evaluate formulations for inner ear delivery via the intratympanic route is currently not available. The existing in vitro diffusion cell systems commonly used to evaluate drug formulations do not resemble the physical dimensions of the middle ear and round window membrane. The objectives of this study were to examine a modified in vitro diffusion cell system of a small diffusion area for studying sustained release formulations in inner ear drug delivery and to identify a formulation for sustained drug delivery to the inner ear. Four formulations and a control were examined in this study using cidofovir as the model drug. Drug release from the formulations in the modified diffusion cell system was slower than that in the conventional diffusion cell system due to the decrease in the diffusion surface area of the modified diffusion cell system. The modified diffusion cell system was able to show different drug release behaviors among the formulations and allowed formulation evaluation better than the conventional diffusion cell system. Among the formulations investigated, poly(lactic-co-glycolic acid)–poly(ethylene glycol)–poly(lactic-co-glycolic acid) triblock copolymer systems provided the longest sustained drug delivery, probably due to their rigid gel structures and/or polymer-to-cidofovir interactions. 相似文献
97.
25th Anniversary Article: Interfacing Nanoparticles and Biology: New Strategies for Biomedicine
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)
Gulen Yesilbag Tonga Krishnendu Saha Vincent M. Rotello 《Advanced materials (Deerfield Beach, Fla.)》2014,26(3):359-370
The exterior surface of nanoparticles (NPs) dictates the behavior of these systems with the outside world. Understanding the interactions of the NP surface functionality with biosystems enables the design and fabrication of effective platforms for therapeutics, diagnostics, and imaging agents. In this review, we highlight the role of chemistry in the engineering of nanomaterials, focusing on the fundamental role played by surface chemistry in controlling the interaction of NPs with proteins and cells. 相似文献
98.
99.
100.
Jingli Zhang Mingxi Zhang Kangjian Tang Francis Verpoort Taolei Sun 《Small (Weinheim an der Bergstrasse, Germany)》2014,10(1):32-46
The introduction of stimuli‐responsive polymers into the study of organic catalysis leads to the generation of a new kind of polymer‐based stimuli‐responsive recyclable catalytic system. Owing to their reversible switching properties in response to external stimuli, these systems are capable of improving the mass transports of reactants/products in aqueous solution, modulating the chemical reaction rates, and switching the catalytic process on and off. Furthermore, their stimuli‐responsive properties facilitate the separation and recovery of the active catalysts from the reaction mixtures. As a fascinating approach of the controllable catalysis, these stimuli‐responsive catalytic systems including thermoresponsive, pH‐responsive, chemo‐mechano‐chemical, ionic strength‐responsive, and dual‐responsive, are reviewed in terms of their nanoreactors and mechanisms. 相似文献