全文获取类型
收费全文 | 63篇 |
免费 | 24篇 |
国内免费 | 3篇 |
专业分类
电工技术 | 14篇 |
综合类 | 4篇 |
化学工业 | 2篇 |
金属工艺 | 2篇 |
机械仪表 | 4篇 |
建筑科学 | 6篇 |
矿业工程 | 4篇 |
能源动力 | 3篇 |
轻工业 | 1篇 |
水利工程 | 1篇 |
石油天然气 | 2篇 |
武器工业 | 4篇 |
无线电 | 21篇 |
一般工业技术 | 3篇 |
冶金工业 | 1篇 |
原子能技术 | 1篇 |
自动化技术 | 17篇 |
出版年
2024年 | 1篇 |
2023年 | 1篇 |
2022年 | 7篇 |
2021年 | 9篇 |
2020年 | 11篇 |
2019年 | 4篇 |
2018年 | 4篇 |
2017年 | 3篇 |
2016年 | 4篇 |
2015年 | 4篇 |
2014年 | 8篇 |
2013年 | 8篇 |
2012年 | 6篇 |
2011年 | 6篇 |
2010年 | 5篇 |
2009年 | 2篇 |
2006年 | 2篇 |
2005年 | 2篇 |
2001年 | 2篇 |
1990年 | 1篇 |
排序方式: 共有90条查询结果,搜索用时 31 毫秒
1.
2.
光纤环形谐振腔环境温度变化带来的偏振波动噪声是影响谐振式光纤陀螺检测精度的主要光学噪声源之一,通过控制谐振腔温度,可以使偏振波动噪声得到有效抑制.为了抑制偏振波动噪声,减小R-FOG精度受FRR温度变化的影响,从理论上分析了谐振腔温度变化对谐振曲线、解调曲线的影响;针对不同温度下光纤环的谐振特性、解调曲线特性、陀螺零偏及零偏稳定性开展了实验,并对实验结果进行了分析.结果表明,谐振腔的工作温度为27.00℃时,两本征偏振态相距最远,总谐振曲线关于谐振频率点对称,谐振频率点检测误差可以忽略;陀螺零偏稳定性近似等于谐振腔温度为25.50℃时的1/100,在150 s的采样时间内达到0.07°/s,陀螺检测精度得到很大提高. 相似文献
3.
Bloom filter (BF) is a space-efficient data structure that represents a large set of items and supports efficient membership queries. It has been widely proposed to employ Bloom filters in the routing entries so as to facilitate data-centric routing in network applications. The existing designs of Bloom filters, however, cannot effectively support in-network queries. Given a query for a data item at a node in the network, the noise in unrelated routing entries very likely equals to the useful information of the item in the right routing entries. Consequently, the majority of queries are routed towards many wrong nodes besides those destinations, wasting large quantities of network traffic. To address this issue, we classified the existing designs as CUBF (Cumulative Bloom filters) and ABF (Aggregated Bloom filters), and then evaluate their performance in routing queries under the noisy environments. Based on the evaluation results, we propose a receiver-oriented design of Bloom filters to sufficiently restrict the probability of a wrong routing decision. Moreover, we significantly decrease the delay of a routing decision in the case of CUBF by using the bit slice approach, and reduce the transmission size of each BF in the case of ABF by using the compression approach. Both the theoretical analysis and experimental results demonstrate that our receiver-oriented design of Bloom filters apparently outperforms the existing approaches in terms of the success probability of routing and network traffic cost. 相似文献
4.
5.
6.
Xiaojun Li Panlong Gao Zuchao Zhu Yi Li 《Journal of Mechanical Science and Technology》2018,32(3):1161-1170
The effect of the blade loading distribution on head, radial force and pressure pulsation of a low specific-speed centrifugal pump with cylindrical impeller blades were investigated in the present study. Blade shapes were obtained by adopting the 1D inverse design method, impellers with different blade loading curves were obtained while the distribution of the blade loading was carefully tailored. Threedimensional URANS simulation method based on the Shear stress transport (SST) k-ω turbulence model was employed for the analyzation of flow patterns. Numerical results including the pressure distribution and velocity profile were validated by comparing with the available experimental data, and an acceptable agreement was obtained. Three typical parameters of the blade loading curve, including the location of the fore-loading point (mpre), location of the aft-loading point (mpost) and slope of the rectilinear segment (K), were analyzed. Results showed that the well-designed blade loading curve, such as the fore-loading impeller, can effectively reduce the pressure pulsation amplitude and the radial force. The significant effect of the variation of the aft-loading point on pump hydrodynamic performance was also investigated. Meanwhile, pressure and velocity distributions at different slopes of the blade loading curves show that the fore-loading impeller produces more uniform flow issuing from the impeller than that of the pump with aft-loading impeller, thus reduces the radial force and pressure pulsation of the pump. 相似文献
7.
Ahn Seongyool Yu Panlong Watanabe Hiroaki Kurose Ryoichi Tanno Kenji Kitagawa Toshiaki 《Journal of Mechanical Science and Technology》2021,35(5):2209-2218
Journal of Mechanical Science and Technology - A three-dimensional numerical simulation was performed to investigate the physics and combustion characteristics of a two-phase reacting turbulent... 相似文献
8.
以Bi2O3为添加剂,采用粉末冶金法制备不同掺杂量的AgSnO2触头材料试样。测量Ag对氧化物基片的润湿角,测试了试样的密度、电导率、接触电阻、燃弧能量等参数,分析了 Bi2O3对AgSnO2触头材料润湿性的影响。结果表明,添加适量的Bi2O3对AgSnO2触头材料的物理和电接触性能有明显的改善,Bi2O3含量为1.5%时AgSnO2触头材料的整体性能达到最佳。润湿角随着Bi2O3含量增大呈现出波动增大的规律,与AgSnO2触头材料接触电阻、燃弧能量的变化规律基本吻合。 相似文献
9.
本文简要介绍了大型柴油发电机组在低频低压下快速自启动的理论依据、方法和辅助设备的改进。最后,讨论了柴油机组自启动的试验结果。 相似文献
10.