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浏览/检索结果: 共5条，第1-5条 帮助 已选(0)清除 条数/页：5101520253035404550556065707580859095100   排序方式：请选择作者升序作者降序题名升序题名降序发表日期升序发表日期降序提交时间升序提交时间降序 我国城乡居民最低保障标准确定问题研究 期刊论文 2013 陈珍珍 收藏  |  浏览/下载：5/0  |  提交时间：2016/07/01 最低保障标准  影响因素分析  确定方法  social security standards of Minimum living  relationship factors analysis  determining method   Molecular and physiological characterization of fluoroquinolone resistance in relation to uropathogenicity among Escherichia coli isolates isolated from Wenyu River, China 期刊论文 chemosphere, 2012 Sun, Jianxian; Hu, Jianying; Peng, Hui; Shi, Jiachen; Dong, Zhaomin 收藏  |  浏览/下载：2/0  |  提交时间：2015/11/10 Fluoroquinolone  Escherichia coli  Resistance  Mutation points  Uropathogenic  Virulence factors  URINARY-TRACT-INFECTIONS  ANTIBIOTIC-RESISTANCE  WASTE-WATER  DNA GYRASE  ANTIMICROBIAL SUSCEPTIBILITY  QUINOLONE RESISTANCE  DETERMINING REGION  MASS-SPECTROMETRY  VIRULENCE FACTORS  CIPROFLOXACIN   Laser pulse coded signal frequency measuring device based on DSP and CPLD (EI CONFERENCE) 会议论文 International Symposium on Photoelectronic Detection and Imaging 2011: Laser Sensing and Imaging; and Biological and Medical Applications of Photonics Sensing and Imaging, May 24, 2011 - May 26, 2011, Beijing, China Zhang H.-B.; Cao L.-H.; Geng A.-H.; Li Y.; Guo R.-H.; Wang T.-F. 收藏  |  浏览/下载：25/0  |  提交时间：2013/03/25 Laser pulse code is an anti-jamming measures used in semi-active laser guided weapons. On account of the laser-guided signals adopting pulse coding mode and the weak signal processing  it need complex calculations in the frequency measurement process according to the laser pulse code signal time correlation to meet the request in optoelectronic countermeasures in semi-active laser guided weapons. To ensure accurately completing frequency measurement in a short time  it needed to carry out self-related process with the pulse arrival time series composed of pulse arrival time  calculate the signal repetition period  and then identify the letter type to achieve signal decoding from determining the time value  number and rank number in a signal cycle by Using CPLD and DSP for signal processing chip  designing a laser-guided signal frequency measurement in the pulse frequency measurement device  improving the signal processing capability through the appropriate software algorithms. In this article  we introduced the principle of frequency measurement of the device  described the hardware components of the device  the system works and software  analyzed the impact of some system factors on the accuracy of the measurement. The experimental results indicated that this system improve the accuracy of the measurement under the premise of volume  real-time  anti-interference  low power of the laser pulse frequency measuring device. The practicality of the design  reliability has been demonstrated from the experimental point of view.   多环芳烃在小白洋淀挺水植物中的分布,组成及其影响因素 期刊论文 湖泊科学, 2010 秦宁; 朱樱; 吴文婧; 王军军; 王雁; 何圮霜; 何伟; 徐福留 收藏  |  浏览/下载：4/0  |  提交时间：2015/10/24 小白洋淀  挺水植物  多环芳烃  分布  组成  影响因素  Small Baiyangdian Lake  emergent macrophytes  PAHs  distribution  composition  determining factors   Intelligent MRTD testing for thermal imaging system using ANN (EI CONFERENCE) 会议论文 ICO20: Remote Sensing and Infrared Devices and Systems, August 21, 2005 - August 26, 2005, Changchun, China Sun J.; Ma D. 收藏  |  浏览/下载：18/0  |  提交时间：2013/03/25 The Minimum Resolvable Temperature Difference (MRTD) is the most widely accepted figure for describing the performance of a thermal imaging system. Many models have been proposed to predict it. The MRTD testing is a psychophysical task  for which biases are unavoidable. It requires laboratory conditions such as normal air condition and a constant temperature. It also needs expensive measuring equipments and takes a considerable period of time. Especially when measuring imagers of the same type  the test is time consuming. So an automated and intelligent measurement method should be discussed. This paper adopts the concept of automated MRTD testing using boundary contour system and fuzzy ARTMAP  but uses different methods. It describes an Automated MRTD Testing procedure basing on Back-Propagation Network. Firstly  we use frame grabber to capture the 4-bar target image data. Then according to image gray scale  we segment the image to get 4-bar place and extract feature vector representing the image characteristic and human detection ability. These feature sets  along with known target visibility  are used to train the ANN (Artificial Neural Networks). Actually it is a nonlinear classification (of input dimensions) of the image series using ANN. Our task is to justify if image is resolvable or uncertainty. Then the trained ANN will emulate observer performance in determining MRTD. This method can reduce the uncertainties between observers and long time dependent factors by standardization. This paper will introduce the feature extraction algorithm  demonstrate the feasibility of the whole process and give the accuracy of MRTD measurement.