首页 | 本学科首页   官方微博 | 高级检索  
文章检索
  按 检索   检索词:      
出版年份:   被引次数:   他引次数: 提示:输入*表示无穷大
  收费全文   502篇
  免费   38篇
  国内免费   5篇
电工技术   12篇
化学工业   144篇
金属工艺   14篇
机械仪表   4篇
建筑科学   4篇
矿业工程   1篇
能源动力   31篇
轻工业   21篇
水利工程   1篇
石油天然气   6篇
无线电   64篇
一般工业技术   121篇
冶金工业   8篇
原子能技术   4篇
自动化技术   110篇
  2024年   1篇
  2023年   15篇
  2022年   19篇
  2021年   24篇
  2020年   37篇
  2019年   26篇
  2018年   33篇
  2017年   22篇
  2016年   16篇
  2015年   16篇
  2014年   31篇
  2013年   48篇
  2012年   19篇
  2011年   34篇
  2010年   34篇
  2009年   22篇
  2008年   27篇
  2007年   14篇
  2006年   9篇
  2005年   15篇
  2004年   1篇
  2003年   6篇
  2002年   6篇
  2001年   8篇
  2000年   2篇
  1999年   4篇
  1998年   5篇
  1997年   1篇
  1996年   5篇
  1995年   2篇
  1994年   4篇
  1993年   5篇
  1992年   2篇
  1991年   5篇
  1990年   1篇
  1989年   2篇
  1988年   2篇
  1987年   2篇
  1986年   2篇
  1985年   1篇
  1983年   3篇
  1982年   3篇
  1981年   2篇
  1980年   4篇
  1979年   1篇
  1978年   1篇
  1977年   1篇
  1974年   1篇
  1965年   1篇
排序方式: 共有545条查询结果,搜索用时 15 毫秒
71.
Full replacement of sucrose with sorbitol is feasible in mango jam manufacturing. Dynamic rheological tests characterized mango jam manufactured with sucrose/sorbitol as a weak gel. Mango jam did not follow Cox-Merz or modified Cox-Merz rule. The storage- and loss- moduli increased with sucrose concentration up to 60%, but decreased at higher sucrose concentrations. Gel strength decreased with increasing sorbitol concentration because of weaker junction zones in pectin gel network. FTIR spectra revealed that C-O and C-C stretching vibrations are indicators of the gel strength because pectin polymeric chain network formation in fruit jam is due to hydrogen bonding and hydrophobic interactions.  相似文献   
72.
In recent years,iron(Fe)based degradable metal is explored as an alternative to permanent fracture fixation devices.In the present work,copper(Cu)is added in Fe-Mn system to enhance the degradation rate and antimicrobial properties.Fe-Mn-xCu(x=0.9,5 and 10 wt.%)alloys are prepared by the melting-casting-forging route.XRD analysis confirms austenite phase stabilization due to the presence of Mn and Cu.As predicted by Thermo-Calc calculations,Cu rich phase precipitations are noticed along the austen-ite grain boundaries.Degradation behaviours of Cu added Fe-Mn alloys are investigated through static immersion and electrochemical polarization where enhanced degradation is found for higher Cu added alloys.When challenged against E.Coli bacteria,the Fe-Mn-Cu alloy media extract shows a significant bac-tericidal effect compare to the base alloy.In vitro cytocompatibility studies,as determined using MG63 and MC3T3-E1 cell lines,indicate increased cell density as a function of time for all the alloys.When implanted in rabbit femur,the newly developed alloy does not show any kind of tissue necrosis around the implants.Better osteogenesis and higher new bone formation are observed with Fe-Mn-10Cu alloy as evident from micro-computed tomography(μ-CT)and fluorochrome labelling.  相似文献   
73.
The micro-powder injection molding (micro-PIM) process has the potential to bridge the gap between the design and manufacturing of micro-components that are often used in small and handy devices. Numerical modeling helps to analyze and overcome various difficulties of micro-PIM. In the present work, a numerical model is developed to predict the powder–binder separation (a common defect in PIM and especially severe in micro-PIM) during the injection of an alumina feedstock. A powder–binder separation criterion is proposed dealing with applied injection pressure and friction force between the powder and binder. An indirect comparison of feedstock travel time between two locations is used to validate the model. The predicted segregation from the simulated result is supported by a qualitative experimental measurement. The developed model can be used to optimize injection parameters to get a defect-free product.  相似文献   
74.
Wireless Personal Communications - This paper presents a study of a class of iris localization algorithms in the presence of blurring. The effect of blurring is a serious problem in most image...  相似文献   
75.
76.
77.
Real-Time Systems - With continuous technology scaling, the power density and hence the temperature of Network-on-Chip (NoC) may increase rapidly. This in-turn degrades the performance of the chip...  相似文献   
78.
79.
The goal of the work presented here was to develop a simulation approach for studying the effects of materials and geometry on the performance of Li‐ion Solid State Batteries (SSB). Simulation provides the opportunity to explore, with ease, different material properties and cell geometries to optimize a Li‐ion SSB's performance. Simulations shown in this paper are time‐dependent and consider electrochemical reaction, heat transfer, the diffusion of Li‐ions and electrons in the electrolyte, and solid Li diffusion in the positive electrode. A 2D model was simulated and the results shown. The simulations were able to show discharge curves, heat flux, the concentration of Li‐ions, electrons, and solid Li at any time in the discharge cycle. Copyright © 2015 John Wiley & Sons, Ltd.  相似文献   
80.
Dohare  Indu  Singh  Karan 《Wireless Networks》2020,26(5):3331-3348
Wireless Networks - Green communication plays a significant role in sensor enabled IoT. Energy is at the focal point in the smart application of the IoT which enables the sensors to be work. The...  相似文献   
设为首页 | 免责声明 | 关于勤云 | 加入收藏

Copyright©北京勤云科技发展有限公司  京ICP备09084417号