中国科学院机构知识库网格系统: 检索

Driving mechanisms of the spatial distribution of industrial parks and the relative hazard level of the surrounding environment 期刊论文 OAI收割
ENVIRONMENTAL GEOCHEMISTRY AND HEALTH, 2025, 卷号: 47, 期号: 1, 页码: 22
作者: Qiao, Pengwei; Shan, Yue; Wei, Yan; Wang, Shuo; He, Peiran

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收藏 | 浏览/下载：19/0 | 提交时间：2025/03/03

Nested structure Over spatial distribution Site selection Main factor identification Hazard level evaluation

基于主体功能区的区域可持续发展协调性分析——以新疆北疆为例 学位论文 OAI收割
北京: 中国科学院大学, 2019
作者: 钟佳利

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收藏 | 浏览/下载：96/0 | 提交时间：2021/12/10

主体功能区可持续发展协调发展度模型关键影响因素 Main Functional Area Sustainable Development Coordinated Development Model Key Influencing Factor

Structure and magnetic properties of (Al, Co) Co-doped ZnO thin films (EI CONFERENCE) 会议论文 OAI收割
2012 International Conference on Materials Science and Nanotechnology, ICMSN 2012, November 16, 2012 - November 18, 2012, Guangzhou, China
Cao P.; Bai Y.

收藏 | 浏览/下载：37/0 | 提交时间：2013/03/25

In this study Zn0.99Co0.01Al0.015O thin film has been prepared by sol-gel method. The structural and magnetic properties of the sample were investigated. X-ray diffraction spectroscopy analyses indicate that the Co and Al codoping can not disturb the structure of ZnO. No additional peaks are observed in the Zn0.99Co0.01Al xO and Al3+ and Co2+ substitute for Zn 2+ without changing the wurtzite structure. The resistance measurements confirm that Al ions increase the free carriers concentration. Based on the above experiments we think the ferromagnetic behavior of the sample could not originate from Co nanoclusters. The presence of free carriers and localized d spins is a prerequisite for the appearance of ferromagnetism. As the result the carriers generated by Al doping is considered a main factor to induce the ferromagnetic phenomenon. (2013) Trans Tech Publications Switzerland.

Precision analysis of simulation systems with hardware-in-loop caused by performance of three-Axis virtual flight motion simulator (EI CONFERENCE) 会议论文 OAI收割
2011 International Conference on Manufacturing Science and Technology, ICMST 2011, September 16, 2011 - September 18, 2011, Singapore, Singapore
Wang T.; Zhu M.-C.; Yin S.-L.; Jia H.-G.

收藏 | 浏览/下载：57/0 | 提交时间：2013/03/25

Simulation systems with hardware-in-loop are composed by three-Axis virtual flight motion simulator simulation computer load torque simulator and visual simulation systems. Three-Axis Virtual Flight Motion Simulator are used to simulate the attitude of missile in simulation system with hardware-in-loop so its performance influenced the result of simulation directly. This paper mainly analyzed the factors which influenced the performance of a three-Axis virtual flight motion simulator which we are used now in the lab then analyzed the entire simulation system's error caused by these factors through numerical simulation method. By analysis we can see that bandwidth is the main factor influenced the precision of simulation systems with hardware-in-loop mechanical device installation error and measurement error may also cause some errors of the systems at the same time.

Study of the neural network constitutive models for turfy soil with different decomposition degree (EI CONFERENCE) 会议论文 OAI收割
2011 2nd International Conference on Mechanic Automation and Control Engineering, MACE 2011, July 15, 2011 - July 17, 2011, Inner Mongolia, China
作者: Nie L.

收藏 | 浏览/下载：23/0 | 提交时间：2013/03/25

The turfy soil is of a special humus soil. The decomposition degree is the main factor on the physical and mechanical properties of turfy soil. To build the turfy soil constitutive model there are a few shortages such as the calculation cumbersome and low accuracy for parameter value with the method of traditional models. Furthermore those methods did not reflect the influence of strength that effected by decomposition degree of the turfy soil. In this paper the relationship of stress-strain with different decomposition degrees of turfy soil was carried out through indoor tests. Based on above experimental results an improved method which divided into different zones according to different decomposition degrees of turfy soil and calculated combining with neural network constitutive model is put forward. The result shows that the neural network of turfy soil has good fitting precision and good generalization ability. It can fully describe the influence of the turfy soil. 2011 IEEE.

Analysis of impact of gyroscope synthetical error on an electric-optical stabilized control system (EI CONFERENCE) 会议论文 OAI收割
3rd International Conference on BioMedical Engineering and Informatics, BMEI 2010, October 16, 2010 - October 18, 2010, Yantai, China
作者: Zhang X.; Zhang X.; Zhang X.; Jiang H.

收藏 | 浏览/下载：26/0 | 提交时间：2013/03/25

As one of the key components on a seeker EO stabilized platform on a missile gyroscope is directly relative to errors of servo systems. Main errors of gyro such as bias drift and scale factor nonlinearity are added to a servo system the result is analyzed to illuminated that how a gyro has effect on a seeker servo system. With the mathematical models of a gyro and a seeker the principle of choosing a gyro is theoretically deduced first and then two gyros model with different main parameters are added into the same gimbals model the errors of servo systems are compared to prove the deduction. Final conclusion is helpful for choosing proper gyros in a seeker servo system. 2010 IEEE.

Factors affecting leaf morphology: a case study of Ranunculus natans C. A. Mey. (Ranunculaceae) in the arid zone of northwest China 期刊论文 OAI收割
ECOLOGICAL RESEARCH, 2009, 卷号: 24, 期号: 6, 页码: 1323-1333
作者: Li, Zhongqiang; Yu, Dan

收藏 | 浏览/下载：80/0 | 提交时间：2010/10/13

Phenotypic plasticity Adaptation Main factor Aquatic macrophyte Arid zone

LED optical engine based on rectangular CPC for micro-projection display (EI CONFERENCE) 会议论文 OAI收割
4th International Symposium on Advanced Optical Manufacturing and Testing Technologies: Advanced Optical Manufacturing Technologies, November 19, 2008 - November 21, 2008, Chengdu, China
作者: Meng Z.; Meng Z.

收藏 | 浏览/下载：24/0 | 提交时间：2013/03/25

With applications in digital display consumer electronics medicine automotive lighting traffic signals and general illumination the light-emitting diode (LED) is the world's most efficient light source being mass produced today[1]. However high cost is the main factor restricting widespread application of LED lighting and the packaging is the most expensive aspect of LED products. Light emitting diodes (LED) are regarded as the most important light sources in solid-state lighting for their advantages in energy efficiency long life vivid colors high reliability environmental protection safety and multiple applications. However application of LEDs in projection display exist many questions such as low illuminance uniformity and low energy efficiency by reason of luminescence distribution and constructure specificity for LED the study on application of LED in the micro-projection display and projection display is reported[2-8]. Considering the question mensioned above the rectangular CPC(Compound Parabolic Concentrator) system with three-color LED is applied in the projection display. 2009 SPIE.

Novel algorithm for computer-aided alignment of wide field of view complex optical system (EI CONFERENCE) 会议论文 OAI收割
Yang X.; Han C.

收藏 | 浏览/下载：37/0 | 提交时间：2013/03/25

With the advent of the new complex optical system alignment technology is necessary. In this paper is presented an alignment algorithm whose main idea is composed of damped least square method and singular value decomposition method. In addition the how and why to enter the damped factor into algorithm is explained. According to this algorithm an alignment software package was compiled and compared self-compiled software with alignment package of CODE V. Results show that this self-compiled software is much more valid than alignment package of CODE V. For a field of view of 2 R-C system average MTF over the field of view was greater than 0.3 at 50 line pairs /mm.

Real time tracking by LOPF algorithm with mixture model (EI CONFERENCE) 会议论文 OAI收割
MIPPR 2007: Automatic Target Recognition and Image Analysis; and Multispectral Image Acquisition, November 15, 2007 - November 17, 2007, Wuhan, China
Meng B.; Zhu M.; Han G.; Wu Z.

收藏 | 浏览/下载：32/0 | 提交时间：2013/03/25

A new particle filter-the Local Optimum Particle Filter (LOPF) algorithm is presented for tracking object accurately and steadily in visual sequences in real time which is a challenge task in computer vision field. In order to using the particles efficiently we first use Sobel algorithm to extract the profile of the object. Then we employ a new Local Optimum algorithm to auto-initialize some certain number of particles from these edge points as centre of the particles. The main advantage we do this in stead of selecting particles randomly in conventional particle filter is that we can pay more attentions on these more important optimum candidates and reduce the unnecessary calculation on those negligible ones in addition we can overcome the conventional degeneracy phenomenon in a way and decrease the computational costs. Otherwise the threshold is a key factor that affecting the results very much. So here we adapt an adaptive threshold choosing method to get the optimal Sobel result. The dissimilarities between the target model and the target candidates are expressed by a metric derived from the Bhattacharyya coefficient. Here we use both the counter cue to select the particles and the color cur to describe the targets as the mixture target model. The effectiveness of our scheme is demonstrated by real visual tracking experiments. Results from simulations and experiments with real video data show the improved performance of the proposed algorithm when compared with that of the standard particle filter. The superior performance is evident when the target encountering the occlusion in real video where the standard particle filter usually fails.