中国科学院机构知识库网格系统: 检索

浏览/检索结果: 共5条，第1-5条

帮助

条数/页：排序方式：
	A new evil waveforms evaluating method for new BDS navigation signals 期刊论文 OAI收割 GPS SOLUTIONS, 2018, 卷号: 22, 期号: 2, 页码: 13 作者: He, Chengyan; Guo, Ji; Lu, Xiaochun; Wang, Xue; Rao, Yongnan \| 收藏 \| 浏览/下载：19/0 \| 提交时间：2021/11/29 GNSS Satellite navigation signal Evil waveform Evaluating Threat model
	Parameterized characterization for rotating-bending fatigue strength of high-strength metal components 会议论文 OAI收割 International Conference on Airworthiness ＆ Fatigue-7th ICSAELS Series Conference, 中国北京/Beijing, China, 2013-03-25 作者: Zhang JF(张均锋); Bian XD(卞祥德); Mu D(穆丹) 收藏 \| 浏览/下载：33/0 \| 提交时间：2014/04/02 fatigue surface modification layer parameterized characterization evaluating model
	Evaluation system of photovoltaic disturbance effect based on simulations (EI CONFERENCE) 会议论文 OAI收割 2011 International Conference on Electric Information and Control Engineering, ICEICE 2011, April 15, 2011 - April 17, 2011, Wuhan, China 作者: Li Y.; Lu M.; Guo L.-H.; Li Y.; Li Y. 收藏 \| 浏览/下载：15/0 \| 提交时间：2013/03/25 The evaluation system is investigated for the disturbing effect of optical countermeasure device to photoelectrical guided weapon in this paper. The general optical countermeasure simulation model is established by using photoelectrical countermeasure simulation test to conduct the estimation of countermeasure effect. The target-missing quantity of guided weapon and guided precision is designated as evaluating index. Whether the disturbing is valid or not is based on Whether the target-missing quantity is more than 3 times of normal guided precision without disturbance or not. 2011 IEEE.
	System identification of tracking error and evaluation of tracking performance using BP neural network (EI CONFERENCE) 会议论文 OAI收割 International Symposium on Photoelectronic Detection and Imaging 2009: Advances in Infrared Imaging and Applications, June 17, 2009 - June 19, 2009, Beijing, China Zhang N.; Shen X.-H. 收藏 \| 浏览/下载：20/0 \| 提交时间：2013/03/25 A novel approach for evaluating the tracking performance of optoelectronic theodolite is proposed. First an equivalent mathematic model of tracking error is established. Then the equivalent sine signal is inputted to the equivalent model and the outputs are sampled. The results of evaluating the tracking performance are obtained based on the statistical calculation of output produced by equivalent model. Equivalent model using the BP (Backprogration) neural network structure is identified. The training method of BP neural network adopts the LM (Levenberg-Marquardt) algorithm for the sake of speeding up training process. The BP neural network is trained and tested by using the training and testing samples gotten from the simulation model of optoelectronic theodolite tracking system under MATLAB/SIMULINK. The estimate errors of equivalent model including average error maximum error and standard error are 2.5872e-0060 2.8 and 1.9. The results show that the equivalent model identified based on BP neural network meets the needs of evaluating the tracking performance of optoelectronic theodolite. The accurate evaluation of tracking performance is achieved. 2009 SPIE.
	Anti-stokes fluorescent cooling by energy transfer (EI CONFERENCE) 会议论文 OAI收割作者: Zhang J.; Wang Y.; Wang Y.; Wang Y.; Wang Y. 收藏 \| 浏览/下载：17/0 \| 提交时间：2013/03/25 A new model on the mechanism of anti-Stokes fluorescent cooling is proposed based on which incident laser induces a phonon-assisted energy transfer from one luminescent center to another in an optical medium and causes medium cooling when the energy transfer is an anti-Stokes process and absorbs phonons. Here we develop the model in two cases: two-phonon-assisted energy transfer for a small energy mismatch and one-phonon-assisted energy transfer for a large energy mismatch. The dependence of relative cooling efficiency on photon energy and temperature is also discussed in evaluating the new mechanism. 2006 Elsevier B.V. All rights reserved.