中国科学院机构知识库网格系统: 检索

Network growth dynamics: The simultaneous interaction between network positions and research performance of collaborative organisations 期刊论文 OAI收割
TECHNOVATION, 2022, 卷号: 115
作者: Zhang, Yi; Chen, Kaihua

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收藏 | 浏览/下载：6/0 | 提交时间：2023/05/30

Network position Research performance Bidirectional relationship Inter-organisational research collaboration ego-network Cognitive proximity

Comparative study of customer relationship management research from East Asia, North America and Europe: A bibliometric overview 期刊论文 OAI收割
ELECTRONIC MARKETS, 2020, 页码: 23
作者: Liu, Wei; Wang, Zongshui; Zhao, Hong

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收藏 | 浏览/下载：9/0 | 提交时间：2020/05/24

Customer relationship management (CRM) Bibliometrics Co-word analysis Comparative analysis Research trends

中国药物分子设计40年发展成就 期刊论文 OAI收割
中国科学生命科学, 2019, 卷号: 49, 期号: 11, 页码: 1375
作者: 谭小芹; 熊嘉诚; 朱亭霏; 黄子铭; 童筱雏

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收藏 | 浏览/下载：50/0 | 提交时间：2020/07/01

drug design lead compounds structure-activity relationship drug target innovative drug research and development 药物分子设计先导化合物结构活性关系药物靶标创新药物研发

Recent Progress on Establishing Structure-Activity Relationship of Catalysts for Selective Catalytic Reduction (SCR) of NOx with NH3 期刊论文 OAI收割
Catalysis Surveys from Asia, 2018, 卷号: 22, 期号: 1, 页码: 1-19
作者: Huang XS(黄晓昇); Zhang GD(张国栋); Lu GX(吕功煊); Tang ZC(唐志诚); Tang ZC(唐志诚)

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收藏 | 浏览/下载：47/0 | 提交时间：2018/06/11

Scr Catalyst Nox Control Structure-activity Relationship Reaction Mechanism Research Progress

Relationships between B-mode ultrasound imaging signals and suspended sediment concentrations 期刊论文 OAI收割
MEASUREMENT, 2016, 卷号: 92, 页码: 34-41
作者: Song, Huan; Ma, Zhimin; Wang, Chuanying; Zou, Xianjian

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收藏 | 浏览/下载：26/0 | 提交时间：2018/06/05

B-mode ultrasound device Imaging signal analysis River model test Relationship research Suspended sediment concentration

Dynamic coupling analysis and modeling for stabilized platform of rolling-pitching seeker (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: Liu H.; Liu H.; Liu H.

收藏 | 浏览/下载：13/0 | 提交时间：2013/03/25

Missile's attitude change will be delivered to visual axis through stabilized platform during maneuvering flight and the missile vibration will be an interference source to visual axis stabilization. In order to solve this problem the coupling relationship between missile attitude and visual axis is obtained by Coordinate transformation. When the seeker stably tracks a target the angular velocity of visual axis in inertial space is zero so the relative angular velocity of roll axis and pitch axis can be derived for servo control. According to Oura dynamics equation the dynamic models of roll axis and pitch axis were established and kinetic equations of two axises were obtained. The dynamic models can provide theoretical basis to developing research of servo control system and structural optimization design of stabilized platform. Finally some measures could reduce the dynamic coupling between the framework was given. 2011 IEEE.

The calibration of faint simulation star magnitude based on single photon count technique (EI CONFERENCE) 会议论文 OAI收割
International Symposium on Photoelectronic Detection and Imaging 2009: Advances in Imaging Detectors and Applications, June 17, 2009 - June 19, 2009, Beijing, China
作者: Xu S.-Y.; Guo J.; Guo J.

收藏 | 浏览/下载：34/0 | 提交时间：2013/03/25

A calibration method of faint star magnitude of the star scene simulation device is proposed in this paper. In the research of simulation star magnitude luminometers and CCD devices are the general calibration devices which are used to measure the illumination intensity and calibrate its magnitude. But if the simulation magnitude is only sixth magnitude its illumination intensity is only 1.010-8 Lux. This illumination intensity level is the lowest illumination intensity that the commercial luminometer can detect. Hence the simulation star magnitude lower than six magnitude cannot be calibrated by luminoters. Likewise CCD devices also need an additive cooler in this case. When the single photon characteristic is presented due to the low luminosity of simulating light sources the simulation star magnitude can be calibrated by detecting its photon flux of radiation with the method of single photon count. In this paper the detection principle of single photon based on a compact designed PMT detecting of the radiation level of simulation star magnitude is advanced. Especially a spectrum match method is proved theoretically to be an effective means for selecting PMT photosensitive type. In the case of the detection object of the simulation star in visible wavelength a analysis indicates that the material of tri-alkali cathode materials its best choice after being compared the Signal-to-Noise of photon detector of several PMT photosensitive materials based on the different spectrum match ratio of different object light sources and different cathode materials. An experiment is employed to show the relationship of control voltage of PMT and its dark counter the relationship of the environment temperature of PMT and its dark counter which proves its only decades of CPS at room temperature. The so low dark counter avoids a bulky cooler and is convenient for installing it on the star scene simulation equipment. Finally in the experiment of calibrating the simulation star magnitudes the ability of its calibration is confirmed to reaches up to 12m meanwhile its calibration error is within 0.2m. 2009 SPIE.

The effect on tolerance distributing of an off-axis three mirror anastigmatic optical system with wavefront coding technology (EI CONFERENCE) 会议论文 OAI收割
Optical System Alignment and Tolerancing II, August 10, 2008 - August 11, 2008, San Diego, CA, United states
作者: Yan F.; Zhang X.-J.; Yan F.

收藏 | 浏览/下载：35/0 | 提交时间：2013/03/25

The wavefront coding technology is known as a system-level technology which can extend the depth of focus of optical system by innovative optical design and image restoration. This technology can control misfocus related aberrations including misfocus astigmatism and Petzval curvature temperature-related misfocus in digital imaging systems. It can also help optical system tolerate more residual error in optical manufacturing and alignment besides misfocus. The brief introduction of wavefront coding technology and the wavefront coded TMA system under research is presented respectively in part 1 and part 2. The "MTF similarity" is defined to describe the relationship among MTF at different position or different fields in the third part. It is also shown in this part that the MTF similarity of wavefront coded system is much higher than the normal system within a large range. In part 4 comparison between the origin system and the new system with wavefront coding technology is provided after multiple errors are introduced from which it can be observed that the system with wavefront coding technology can tolerate much bigger error than origin system. The error tolerance is re-distributed according to a new criterion based on MTF similarity. If the MTF similarity is less than a certain value it can be regarded that the system can tolerate the residual error. The new error tolerance is displayed and it is shown that the wavefront coding technology can also loosen the error distributing besides extended the depth of focus.

Research on the affect of differential-images technique to the resolution of infrared spatial camera (EI CONFERENCE) 会议论文 OAI收割
3rd International Symposium on Advanced Optical Manufacturing and Testing Technologies: Optical Test and Measurement Technology and Equipment, July 8, 2007 - July 12, 2007, Chengdu, China
Jin G.; An Y.; Qi Y.; Hu F.

收藏 | 浏览/下载：18/0 | 提交时间：2013/03/25

The optical system of infrared spatial camera adopts bigger relative aperture and bigger pixel size on focal plane element. These make the system have bulky volume and low resolution. The potential of the optical systems can not be exerted adequately. So one method for improving resolution of infrared spatial camera based on multi-frame difference-images is introduced in the dissertation. The method uses more than one detectors to acquire several difference images and then reconstructs a new high-resolution image from these images through the relationship of pixel grey value. The technique of difference-images that uses more than two detectors is researched and it can improve the resolution 2.5 times in theory. The relationship of pixel grey value between low-resolution difference-images and high-resolution image is found by analyzing the energy of CCD sampling a general relationship between the enhanced times of the resolution of the detected figure with differential method and the least count of CCD that will be used to detect figure is given. Based on the research of theory the implementation process of utilizing difference-images technique to improve the resolution of the figure was simulated used Matlab software by taking a personality image as the object and the software can output the result as an image. The result gotten from the works we have finished proves that the technique is available in high-resolution image reconstruction. The resolution of infrared spatial camera can be improved evidently when holding the size of optical structure or using big size detector by applying for difference image technique. So the technique has a high value in optical remote fields.

Application of linear CCD for position measurement (EI CONFERENCE) 会议论文 OAI收割
ICO20: Optical Devices and Instruments, August 21, 2005 - August 26, 2005, Changchun, China
作者: Fu Y.; Liu L.

收藏 | 浏览/下载：26/0 | 提交时间：2013/03/25

A method that measures relatively position relation between two vehicles fleetly and accurately that are both on a horizontal plane is proposed in the article. When manipulator rotates horizontally that of angle is less than 26 the linear CCD vidicon that is on the end of manipulator on the loading vehicle scans two point targets that are on the launching vehicle which satisfies technical requests. So the method is feasible. The research is not only significant for missile of automatic transshipment and then we can utilize spatial intersection principle and trigonometry theorem to get relatively position relationship. I.e. the coordinate parameters: x but also is valuable in theoretic research on method of measuring spatial position relationship. y z . Error analysis and the simulation on computer validate: the measurement error of length is less than 0.84mm