全文获取类型
收费全文 | 161篇 |
免费 | 11篇 |
国内免费 | 20篇 |
专业分类
电工技术 | 10篇 |
综合类 | 16篇 |
化学工业 | 4篇 |
金属工艺 | 1篇 |
机械仪表 | 11篇 |
建筑科学 | 2篇 |
矿业工程 | 4篇 |
轻工业 | 2篇 |
武器工业 | 1篇 |
无线电 | 58篇 |
一般工业技术 | 13篇 |
原子能技术 | 3篇 |
自动化技术 | 67篇 |
出版年
2022年 | 1篇 |
2019年 | 1篇 |
2018年 | 2篇 |
2017年 | 1篇 |
2016年 | 1篇 |
2015年 | 4篇 |
2014年 | 13篇 |
2013年 | 9篇 |
2012年 | 9篇 |
2011年 | 9篇 |
2010年 | 7篇 |
2009年 | 13篇 |
2008年 | 15篇 |
2007年 | 16篇 |
2006年 | 16篇 |
2005年 | 10篇 |
2004年 | 10篇 |
2003年 | 9篇 |
2002年 | 10篇 |
2001年 | 10篇 |
2000年 | 9篇 |
1999年 | 3篇 |
1998年 | 3篇 |
1997年 | 2篇 |
1996年 | 4篇 |
1994年 | 2篇 |
1993年 | 2篇 |
1987年 | 1篇 |
排序方式: 共有192条查询结果,搜索用时 7 毫秒
1.
2.
ANALYSIS ON ROOM TEMPERATURE TENSILE STRENGTH OF δ-Al_2O_3, FIBER / Al-12Si COMPOSITE 总被引:1,自引:0,他引:1
对δ-Al2O3纤维/Al-12Si复合材料室温拉伸强度的分析表明,在实验条件下该复合材料存在δ-Al2O3纤维的最小体积分数Vmin和临界体积分数Vcrit,并求出其基体强度δm和室温强度σc-δ-Al2O3纤维体积分数Vf直线方程及纤维的临界长度lc和复合材料的剪切应力τP确定复合材料的ROM预测曲线,应首先判断σm是否等于未增强合金的强度σum才能得出正确的结论。 相似文献
3.
Signature analyzers are very efficient output response compactors for BIST design. The only limitation of signature analysis is the fault coverage reduction (aliasing) due to the information loss inherent to any data compaction. In this article, in order to increase the effectiveness of ROM BIST, we take advantage from the simplicity of the error patterns generated by ROMs and we show that aliasing free signature analysis can be achieved in ROM BIST.This work was performed when the author was on leave from Minsk Radio Engineering Institute, Computer Department, Belorus. 相似文献
4.
5.
对TMS320C620X/670XDSP的存储结构和特点进行分析,采用分两次生成ROM文件的方式实现TMS320C620X/670XDSP自举,并阐述了该自举方法的关键过程。通过该自举方法,程序在片内RAM中执行,预置参数和常量从外部ROM中读取。结合软件三模冗余,该自举方法可以防止复杂电磁干扰环境下单粒子翻转效应。该方法已得到实际应用,行之有效。 相似文献
6.
介绍一种基于ARM的密码锁,它对系统的硬件设计和软件设计进行详细的描述。硬件方面,系统采用LPC2114为微控制器,CSI24WCO2为E^2PROM。LPC2114通过I^2C总线与CS124WCO2通信以实现系统功能。软件方面,系统主要包括加密和解密两部分。 相似文献
7.
《Ergonomics》2012,55(6):782-791
Manual load carriage is a universal activity and an inevitable part of the daily schedule of a soldier. Indian Infantry soldiers carry loads on the waist, back, shoulders and in the hands for a marching order. There is no reported study on the effects of load on gait in this population. It is important to evaluate their kinematic responses to existing load carriage operations and to provide guidelines towards the future design of heavy military backpacks (BPs) for optimising soldiers' performance. Kinematic changes of gait parameters in healthy male infantry soldiers whilst carrying no load (NL) and military loads of 4.2–17.5 kg (6.5–27.2% body weight) were investigated. All comparisons were conducted at a self-selected speed. Soldier characteristics were: mean (SD) age 23.3 (2.6) years; height 172.0 (3.8) cm; weight 64.3 (7.4) kg. Walk trials were collected using a 3-D Motion Analysis System. Results were subjected to one-way ANOVA followed by Dunnett post hoc test. There were increases in step length, stride length, cadence and midstance with the addition of a load compared to NL. These findings were resultant of an adaptive phenomenon within the individual to counterbalance load effect along with changes in speed. Ankle and hip ranges of motion (ROM) were significant. The ankle was more dorsiflexed, the knee and hip were more flexed during foot strike and helped in absorption of the load. The trunk showed more forward leaning with the addition of a load to adjust the centre of mass of the body and BP system back to the NL condition. Significant increases in ankle and hip ROM and trunk forward inclination (≥10°) with lighter loads, such as a BP (10.7 kg), BP with rifle (14.9 kg) and BP with a light machine gun (17.5 kg), may cause joint injuries. It is concluded that the existing BP needs design improvisation specifically for use in low intensity conflict environments. Statement of Relevance:The present study evaluates spatial, temporal and angular changes at trunk and limb joints during military load carriage of relatively lighter magnitude. Studies on similar aspects on the specific population are limited. These data can be used for optimising load carriage and designing ensembles, especially a heavy BP, for military operations. 相似文献
8.
《Ergonomics》2012,55(2):171-186
Sixteen male subjects each performed a repetitive, downwards, non-prehensile wrist exertion task with the arm pronated, at a rate of 15 times per minute and with a force of 10N?±?1N in 49 combinations of flexion/extension and radial/ulnar deviation to 0%, 18%, 38% and 55% of the Range of Motion (ROM) for 5 min each. The dependent measure was discomfort measured on a 100 mm visual analogue scale and for most of the analyses these were standardized by using the min?-?max procedure of <citeref rid="b20">Gescheider (1988)</citeref>. These Standardised Discomfort Levels (SDLs) were fitted to mathematical equations from which iso-discomfort contours were derived relative to the percentages of flexion/extension and radial/ulnar-deviation ROM used. The lowest standardized discomfort was found for the neutral wrist posture, followed by 18% extension with neutral radial/ulmar deviation. The results reveal interesting features of the processes involved and provide useful avenues for further research. 相似文献
9.
A method for evaluating fault coverage using simulated fault injection for digitalized systems in nuclear power plants 总被引:1,自引:0,他引:1
Suk Joon Kim Poong Hyun Seong Jun Seok Lee Man Cheol Kim Hyun Gook Kang Seung Cheol Jang 《Reliability Engineering & System Safety》2006,91(5):614-623
The fault coverage for digital system in nuclear power plants is evaluated using a simulated fault injection method. Digital systems have numerous advantages, such as hardware elements share and hardware replication of the needed number of independent channels. However, the application of digital systems to safety-critical systems in nuclear power plants has been limited due to reliability concerns. In the reliability issues, fault coverage is one of the most important factors. In this study, we propose an evaluation method of the fault coverage for safety-critical digital systems in nuclear power plants. The system under assessment is a local coincidence logic processor for a digital plant protection system at Ulchin nuclear power plant units 5 and 6. The assessed system is simplified and then a simulated fault injection method is applied to evaluate the fault coverage of two fault detection mechanisms. From the simulated fault injection experiment, the fault detection coverage of the watchdog timer is 44.2% and that of the read only memory (ROM) checksum is 50.5%. Our experiments show that the fault coverage of a safety-critical digital system is effectively quantified using the simulated fault injection method. 相似文献
10.