全文获取类型
收费全文 | 859篇 |
免费 | 25篇 |
国内免费 | 4篇 |
专业分类
电工技术 | 11篇 |
化学工业 | 169篇 |
金属工艺 | 22篇 |
机械仪表 | 27篇 |
建筑科学 | 13篇 |
能源动力 | 26篇 |
轻工业 | 86篇 |
水利工程 | 2篇 |
无线电 | 146篇 |
一般工业技术 | 180篇 |
冶金工业 | 75篇 |
自动化技术 | 131篇 |
出版年
2024年 | 1篇 |
2023年 | 2篇 |
2022年 | 11篇 |
2021年 | 15篇 |
2020年 | 4篇 |
2019年 | 8篇 |
2018年 | 9篇 |
2017年 | 15篇 |
2016年 | 11篇 |
2015年 | 11篇 |
2014年 | 18篇 |
2013年 | 69篇 |
2012年 | 41篇 |
2011年 | 36篇 |
2010年 | 37篇 |
2009年 | 43篇 |
2008年 | 49篇 |
2007年 | 62篇 |
2006年 | 42篇 |
2005年 | 31篇 |
2004年 | 24篇 |
2003年 | 34篇 |
2002年 | 27篇 |
2001年 | 18篇 |
2000年 | 19篇 |
1999年 | 21篇 |
1998年 | 36篇 |
1997年 | 29篇 |
1996年 | 29篇 |
1995年 | 19篇 |
1994年 | 19篇 |
1993年 | 14篇 |
1992年 | 7篇 |
1991年 | 7篇 |
1990年 | 7篇 |
1989年 | 8篇 |
1988年 | 9篇 |
1987年 | 7篇 |
1986年 | 7篇 |
1985年 | 7篇 |
1984年 | 6篇 |
1983年 | 2篇 |
1982年 | 3篇 |
1981年 | 1篇 |
1980年 | 3篇 |
1979年 | 2篇 |
1977年 | 5篇 |
1976年 | 3篇 |
排序方式: 共有888条查询结果,搜索用时 15 毫秒
881.
882.
Ying Zhong Yi-Siou Chiou Min-Hsiung Pan Chi-Tang Ho Fereidoon Shahidi 《Journal of Functional Foods》2012,4(1):323-330
Epigallocatechin gallate (EGCG), the major polyphenol in green tea and a functional food ingredient/nutraceutical with health-promoting properties, was structurally modified by esterification with butyric and docosahexaenoic (DHA) acid in order to improve its lipophilicity and hence bioefficacy in vivo. The lipophilic derivatives of EGCG so-prepared were evaluated for their anticancer activity against azoxymethane (AOM)-induced colon carcinogenesis in mice. Formation of colonic aberrant crypt foci (ACF) was monitored as the biomarker of colorectal cancer (CRC). It was found that oral administration of EGCG derivatives led to reduced size of ACF in the mouse colon. EGCG–DHA esters were more effective than EGCG-butyrate in inhibiting the formation of ACF. The total number of large colonic ACF was remarkably decreased by treatment with EGCG derivatives, especially by the EGCG–DHA esters, which showed a 100% inhibition of large ACF formation. Two tumor-promoting enzymes, iNOS and COX-2 were also inhibited by EGCG derivatives to various extents at the expression level. The results suggest that the lipophilic ester derivatives of EGCG are effective in inhibiting colon carcinogenesis and may be good candidates for colon cancer prevention/treatment. 相似文献
883.
Eliminating cryptographic computation errors is vital for preventing attacks. A simple approach is to verify the correctness
of the cipher before outputting it. The multiplication is the most significant arithmetic operation among the cryptographic
computations. Hence, a multiplier with concurrent error detection ability is urgently necessary to avert attacks. Employing
the re-computing shifted operand concept, this study presents a semi-systolic array polynomial basis multiplier with concurrent
error detection with minimal area overhead. Moreover, the proposed multiplier requires only two extra clock cycles while traditional
multipliers using XOR trees consume at least
extra XOR gate delays in GF(2m) fields.
Chiou-Yng Lee received the Bachelor’s degree (1986) in medical engineering and the M.S. degree in electronic engineering (1992), both from
the Chung Yuan university, Taiwan, and the Ph.D. degree in electrical engineering from Chang Gung University, Taiwan, in 2001.
From 1988 to now, he was a research associate with Chunghwa Telecommunication Laboratory in Taiwan. He joined the department
of project planning. He taught those related field courses at Ching-Yun Technology University. He is currently as an assistant
professor of Department of Computer Information and Network Engineering in Lunghwa University of Science and Technology. His
research interests include computations in finite fields, error-control coding, signal processing, and digital transmission
system. Besides, he is a member of the IEEE and the IEEE Computer society. He is also an honor member of Phi Tao Phi in 2001.
Che Wun Chiou received his B.S. degree in Electronic Engineering from Chung Yuan Christian University in 1982, the M.S. degree and the
Ph.D. degree in Electrical Engineering from National Cheng Kung University in 1984 and 1989, respectively. From 1990 to 2000,
he was with the Chung Shan Institute of Science and Technology in Taiwan. He joined the Department of Electronic Engineering
and the Department of Computer Science and Information Engineering, Ching Yun University in 2000 and 2005, respectively. He
is currently as Dean of Division of Continuing Education in Ching Yun University. His current research interests include fault-tolerant
computing, computer arithmetic, parallel processing, and cryptography.
Jim-Min Lin was born on March 5, 1963 in Taipei, Taiwan. He received the B.S. degree in Engineering Science and the M.S. and the Ph.D.
degrees in Electrical Engineering, all from National Cheng Kung University, Tainan, Taiwan, in 1985, 1987, and 1992, respectively.
Since February 1993, he has been an Associate Professor at the Department of Information Engineering and Computer Science,
Feng Chia University, Taichung City, Taiwan. He is currently as Professor at the Department of Information Engineering and
Computer Science, Feng Chia University. His research interests include Operating Systems, Software Integration/Reuse, Embedded
Systems, Software Agent Technology, and Testable Design. 相似文献
884.
Wei SW Chern LL Wu YC Wang YL Lin CM Chiou CS 《International journal of food microbiology》2008,122(1-2):148-155
We reported four foodborne disease outbreaks in Taiwan caused by sucrose-nonfermenting and by beta-galactosidase-deficient variants of non-O1, non-O139 Vibrio cholerae. The sucrose-nonfermenting vibrios collected from three outbreaks were biochemically identified to be V. mimicus and the beta-galactosidase-deficient vibrios from an outbreak to be V. alginolyticus. However, molecular methods including DNA-DNA hybridization, fatty acid profile analysis, and sequence analysis of 16S rRNA, oriC, pyrH, recA, and rpoA indicated that these vibrios should be V. cholerae. These V. cholerae variants carried two hemolysin genes, hlyA and hlx, but contained neither cholera toxin gene, ctx, V. mimicus hemolysin gene, vmh, nor thermo-directed hemolysin, tdh. The sucrose-nonfermenting variants of V. cholerae shared a high level of genetic relatedness; they could derive from a common clone. In our record from 1995 to date, this was the first time that V. cholerae variants were discovered as etiologic agents for foodborne disease outbreaks in Taiwan. 相似文献
885.
Sol-gel prepared Ni-alumina composite materials 总被引:3,自引:0,他引:3
The sol-gel method has been utilized for the preparation of dense, homogeneous ceramic-metal composites with up to 50% Ni in Al2O2. Examination by SEM and TEM shows that the materials consist of micrometre-size Al2O3 with metallic Ni in isolated regions from 50 m down to nanometre size. The density ranges from 97% (10% Ni) to 74% (50% Ni) of the theoretical number. The hardness decreases from 18 GPa for pure alumina to 10 GPa for alumina containing 50% Ni. The fracture toughness increases significantly from K
1c=3–4 MPa m1/2 to K
1c=8.5 MPa m1/2. The elastic and shear moduli decrease from E=400 GPa and G=160 GPa for pure alumina to E=320 GPa and G=135 GPa when containing 50% Ni. The electrical resistivity is 106m with 10 to 40% Ni but decreases drastically at 50% Ni content. 相似文献
886.
Synergetic effect of hybrid boron nitride and multi-walled carbon nanotubes on the thermal conductivity of epoxy composites 总被引:1,自引:0,他引:1
Chih-Chun Teng Chen-Chi M. Ma Kuo-Chan Chiou Tzong-Ming Lee Yeng-Fong Shih 《Materials Chemistry and Physics》2011
This study investigates the synergistic effect of combining multi-walled carbon nanotubes (MWCNTs) and boron nitride (BN) flakes on thermally conductive epoxy composite. The surface of the two fillers was functionalized to form covalent bonds between the epoxy and filler, thereby reducing thermal interfacial resistance. The hybrid filler provided significant enhancement of thermal conductivity, adding 30 vol% modified BN and 1 vol% functionalized MWCNTs achieving a 743% increase in thermal conductivity (1.913 W mK−1, compared to 0.2267 W mK−1 of neat epoxy). 相似文献
887.
As robots enabled by artificial intelligence become more agentic, people may come to develop trust schemas based on a robot's actions and attribute blame to the robot as they would with a human partner. Trust and blame have yet to be investigated during dynamic physical coordination tasks despite the potential ramifications for manufacturing and service industries that could benefit from effective human–robot physical coordination. In anticipation of future human–robot work configurations, we developed a joint physical coordination task as a preliminary test environment for understanding trust and blame in a work partner. Fifty-five participants were asked to jointly balance and transport a weighted box along a fixed path, and we used this test environment to evaluate the impact of a surprising event on trust in a work partner, and attribution of blame following a negative performance outcome. Results indicate that the group who experienced a surprising event compared to the group who did not trusted their partner more, but there was no difference in the attribution of blame to themselves, their partner, or to the surprising event. Conversely, the group who did not experience a surprising event tended to blame themselves for the negative outcome. These findings suggest that environmental uncertainty may prompt people's attribution of blame across multiple parties, including themselves. Moreover, people may build trust in work partners through the shared experience of surprising events. Future work would benefit from adopting our study design to investigate whether these findings are extendable to human–robot joint actors. 相似文献
888.
Chih-Ying Huang Hung-Min Lin Chun-Hao Chiang Hsin-An Chen Ting-Ran Liu Deepak Vishnu S. K Jau-Wern Chiou Raman Sankar Huang-Ming Tsai Way-Faung Pong Chun-Wei Chen 《Advanced functional materials》2023,33(43):2305792
Because oxygen molecules in the ground state favor a triplet spin configuration, spin-polarized electrons at electrocatalysts may promote the generation of parallel spin-aligned oxygen atoms, enhancing oxygen evolution reaction (OER) kinetics. In this study, a significant enhancement of OER performance is demonstrated by controlling the spin-exchange interaction and spin-selected electron transfer of 2D CoxFe1−xPS3 (x = 0–0.45) van der Waals (vdW) single crystals through Co doping. The pristine FePS3 exhibits antiferromagnetic orbital ordering, while the Co-doped FePS3 exhibits the emergence of interatomic ferromagnetism due to doping-mediated magnetic exchange interactions. The coupling between Fe and Co ions in the Co-doped FePS3 crystal allows the formation of efficient spin-selective electron transfer channels compared to the pristine FePS3. The correlation of spin-exchange interactions and spin-selected electron transfers of 2D Co-doped FePS3 crystals with a superior OER performance is further revealed by superconducting quantum interference device magnetometer, in situ X-ray absorption near edge spectra and density functional theory simulations. The result suggests that manipulating the spin-exchange interactions of 2D vdW crystals to enhance the spin-selected electron transfer efficiencies through doping is an effective strategy to boost their OER catalytic performances. 相似文献