全文获取类型
收费全文 | 6650篇 |
免费 | 276篇 |
国内免费 | 17篇 |
专业分类
电工技术 | 73篇 |
综合类 | 7篇 |
化学工业 | 1556篇 |
金属工艺 | 109篇 |
机械仪表 | 150篇 |
建筑科学 | 331篇 |
矿业工程 | 9篇 |
能源动力 | 228篇 |
轻工业 | 550篇 |
水利工程 | 63篇 |
石油天然气 | 26篇 |
武器工业 | 2篇 |
无线电 | 587篇 |
一般工业技术 | 1116篇 |
冶金工业 | 954篇 |
原子能技术 | 35篇 |
自动化技术 | 1147篇 |
出版年
2023年 | 68篇 |
2022年 | 109篇 |
2021年 | 173篇 |
2020年 | 124篇 |
2019年 | 125篇 |
2018年 | 175篇 |
2017年 | 158篇 |
2016年 | 195篇 |
2015年 | 161篇 |
2014年 | 225篇 |
2013年 | 412篇 |
2012年 | 369篇 |
2011年 | 432篇 |
2010年 | 327篇 |
2009年 | 371篇 |
2008年 | 358篇 |
2007年 | 372篇 |
2006年 | 264篇 |
2005年 | 254篇 |
2004年 | 207篇 |
2003年 | 183篇 |
2002年 | 160篇 |
2001年 | 107篇 |
2000年 | 112篇 |
1999年 | 109篇 |
1998年 | 112篇 |
1997年 | 122篇 |
1996年 | 86篇 |
1995年 | 104篇 |
1994年 | 89篇 |
1993年 | 65篇 |
1992年 | 65篇 |
1991年 | 31篇 |
1990年 | 46篇 |
1989年 | 67篇 |
1988年 | 51篇 |
1987年 | 41篇 |
1986年 | 52篇 |
1985年 | 59篇 |
1984年 | 45篇 |
1983年 | 55篇 |
1982年 | 35篇 |
1981年 | 36篇 |
1980年 | 33篇 |
1979年 | 26篇 |
1978年 | 19篇 |
1977年 | 17篇 |
1976年 | 25篇 |
1975年 | 29篇 |
1974年 | 22篇 |
排序方式: 共有6943条查询结果,搜索用时 15 毫秒
71.
Sylvain Tourancheau Kjell Brunnström Börje Andrén Patrick Le Callet 《Journal of the Society for Information Display》2009,17(3):239-249
Abstract— The primary goal of this study was to find a measurement method for motion blur which is easy to carry out and gives results that can be reproduced from one lab to another. This method should be able to also take into account methods for reduction of motion blur such as backlight flashing. Two methods have been compared. The first method uses a high‐speed camera that permits us to directly picture the blurred‐edge profile. The second one exploits the mathematical analysis of the motion‐blur formation to construct the blurred‐edge profile from the temporal step response. Measurement results and method proposals are given and discussed. 相似文献
72.
The present paper deals with a generalization of the homogeneous multi-server finite-source retrial queue with search for customers in the orbit. The novelty of the investigation is the introduction of balking and impatience for requests who arrive at the service facility with a limited capacity and FIFO queue. Arriving customers may balk, i.e., they either join the queue or go to the orbit. Moreover, the requests are impatient and abandon the buffer after a random time and enter the orbit, too. In case of an empty buffer, each server searches for a customer in the orbit after finishing service. All random variables involved in the model construction are supposed to be exponentially distributed and independent of each other. The primary aim of this analysis is to show the effect of balking, impatience, and buffer size on the steady-state performance measures. Concentrating on the mean response time, several numerical examples are investigated by the help of the MOSEL-2 tool used for creating the model and calculating the stationary characteristics. 相似文献
73.
74.
75.
This paper introduces time stream Pétri nets (Ts treamPn), a model for the formal specification of multimedia synchronization scenarios. This new model extends time Pétri nets to formally describe the timed behaviour of multimedia objects and streams in asynchronous distributed systems. The proposed approach uses time intervals to label the arcs exiting from the places of the net, and typed transitions to define different firing rules. This model allows a complete and accurate specification of synchronization constraints between multimedia streams and can be used at different levels of granularity. 相似文献
76.
Yannick Schellander Marius Winter Maurice Schamber Fabian Munkes Patrick Schalberger Harald Kuebler Tilman Pfau Norbert Fruehauf 《Journal of the Society for Information Display》2023,31(5):363-372
In this work, real-time ultraviolet photodetectors are realized through metal–semiconductor–metal (MSM) structures. Amorphous indium gallium zinc oxide (a-IGZO) is used as semiconductor material and gold as metal electrodes. The readout of an individual sensor is implemented by a transimpedance amplifier (TIA) consisting of an all-enhancement a-IGZO thin-film transistor (TFT) operational amplifier and a switched capacitor (SC) as feedback resistance. The photosensor and the transimpedance amplifier are both manufactured on glass substrates. The measured photosensor possesses a high responsivity R , a low response time t R E S , and a good noise equivalent power value NEP . 相似文献
77.
Sheikh Abdullah Al Nusayer Patrick Schalberger Holger Baur Florian Kleber Norbert Fruehauf 《Journal of the Society for Information Display》2023,31(9):535-547
Active matrix prestressed microelectromechanical shutter displays enable outstanding optical properties as well as robust operating performance. The microelectromechanical systems (MEMS) shutter elements have been optimized for higher light outcoupling efficiency with lower operation voltage and higher pixel density. The MEMS elements have been co-fabricated with self-aligned metal-oxide thin-film transistors (TFTs). Several optimizations were required to integrate MEMS process without hampering the performance of both elements. The optimized display process requires only seven photolithographic masks with ensuring proper compatibility between MEMS shutter and metal-oxide TFT process. 相似文献
78.
Srivastava Rachna Gaudet Vincent C. Mitran Patrick 《Journal of Signal Processing Systems》2022,94(1):101-116
Journal of Signal Processing Systems - This paper describes a field-programmable gate array (FPGA) implementation of a fixed-point low-density lattice code (LDLC) decoder where the Gaussian mixture... 相似文献
79.
Journal of Logic, Language and Information - 相似文献
80.
High Figure of Merit (FOM) of Bragg Modes in Au‐Coated Nanodisk Arrays for Plasmonic Sensing 下载免费PDF全文
Maxime Couture Thibault Brulé Stacey Laing Wenli Cui Mitradeep Sarkar Benjamin Charron Karen Faulds Wei Peng Michael Canva Jean‐Francois Masson 《Small (Weinheim an der Bergstrasse, Germany)》2017,13(38)
Gold‐coated nanodisk arrays of nearly micron periodicity are reported that have high figure of merit (FOM) and sensitivity necessary for plasmonic refractometric sensing, with the added benefit of suitability for surface‐enhanced Raman scattering (SERS), large‐scale microfabrication using standard photolithographic techniques and a simple instrumental setup. Gold nanodisk arrays are covered with a gold layer to excite the Bragg modes (BM), which are the propagative surface plasmons localized by the diffraction from the disk array. This generates surface‐guided modes, localized as standing waves, leading to highly confined fields confirmed by a mapping of the SERS intensity and numerical simulations with 3D finite element method. The optimal gold‐coated nanodisk arrays are applied for refractometric sensing in transmission spectroscopy with better performance than nanohole arrays and they are integrated to a 96‐well plate reader for detection of IgY proteins in the nanometer range in PBS. The potential for sensing in biofluids is assessed with IgG detection in 1:1 diluted urine. The structure exhibits a high FOM of up to 46, exceeding the FOM of structures supporting surface plasmon polaritons and comparable to more complex nanostructures, demonstrating that subwavelength features are not necessary for high‐performance plasmonic sensing. 相似文献