中国科学院机构知识库网格系统: 检索

Isotopic reconstruction of iron oxidation-reduction process based on an Archean Ocean analogue 期刊论文 OAI收割
SCIENCE OF THE TOTAL ENVIRONMENT, 2022, 卷号: 817, 页码: 10
作者: Yang, Xi; Guo, Qingjun; Boyko, Valeria; Avetisyan, Khoren; Findlay, Alyssa J.

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Iron isotopes Iron oxidation-reduction process Dissimilatory iron reduction Modern lake Archean

Isotopic reconstruction of iron oxidation-reduction process based on an Archean Ocean analogue 期刊论文 OAI收割
SCIENCE OF THE TOTAL ENVIRONMENT, 2022, 卷号: 817, 页码: 10
作者: Yang, Xi; Guo, Qingjun; Boyko, Valeria; Avetisyan, Khoren; Findlay, Alyssa J.

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Iron isotopes Iron oxidation-reduction process Dissimilatory iron reduction Modern lake Archean

Quantitative temperature reconstruction based on growth rate of annually-layered stalagmite: a case study from central China 期刊论文 OAI收割
QUATERNARY SCIENCE REVIEWS, 2013, 卷号: 72, 页码: 137-145
作者: Tan, Liangcheng; Yi, Liang; Cai, Yanjun; Shen, Chuan-Chou; Cheng, Hai

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收藏 | 浏览/下载：19/0 | 提交时间：2018/09/26

Stalagmite Annual layer Growth rate Temperature Modern process Central China

Quantitative temperature reconstruction based on growth rate of annually-layered stalagmite: a case study from central China 期刊论文 OAI收割
QUATERNARY SCIENCE REVIEWS, 2013, 卷号: 72, 页码: 137-145
作者: Tan, Liangcheng; Yi, Liang; Cai, Yanjun; Shen, Chuan-Chou; Cheng, Hai

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收藏 | 浏览/下载：23/0 | 提交时间：2018/09/26

Stalagmite Annual layer Growth rate Temperature Modern process Central China

Quantitative temperature reconstruction based on growth rate of annually-layered stalagmite: a case study from central China 期刊论文 OAI收割
QUATERNARY SCIENCE REVIEWS, 2013, 卷号: 72, 页码: 137-145
作者: Cai, YJ (Cai, Yanjun)[ 1 ]; Tan, LC (Tan, Liangcheng)[ 1 ]; Yi, L (Yi, Liang)[ 2 ]; An, ZS (An, Zhisheng)[ 1 ]; Cheng, H (Cheng, Hai)[ 4,5 ]

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收藏 | 浏览/下载：26/0 | 提交时间：2018/12/10

Stalagmite Annual Layer Growth Rate Temperature Modern Process Central China

Design of reimaging F/1.0 long-wavelength infrared optical system (EI CONFERENCE) 会议论文 OAI收割
International Symposium on Photoelectronic Detection and Imaging 2011: Advances in Infrared Imaging and Applications, May 24, 2011 - May 24, 2011, Beijing, China
作者: Zhang X.; Zhang X.; Zhang X.

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A reimaging F/1.0 long-wavelength infrared optical system is proposed. The design has a flexible opto-mechanical layout. The design process is as follows. Firstly the catadioptric reimaging system consists of two reflecting mirrors and a relay lenses. Two reflecting mirrors make up of the first imaging system and are therefore free of chromatic aberrations while low dispersion lenses were used in the reimaging system so the optical system do not need achromatic design for a high image quality. Then to correct high-order aberrations resulting from large relative aperture more parameters need to be used with aspheric or diffractive surfaces due to modern optic technology development. Here aspheric is selected for easily manufacture. Finally the design is completed with the help of ZEMAX software. The effective focal length of the objective is 120mm and the field of view (FOV) is 4. The simulated final design shows adequate image quality and the modulation transfer function (MTF) is close to diffraction limit. The effect of the surrounding environmental temperature is analyzed using the concept of thermal defocusing and the thermal compensation is discussed. 2011 Copyright Society of Photo-Optical Instrumentation Engineers (SPIE).

The ship-borne infrared searching and tracking system based on the inertial platform (EI CONFERENCE) 会议论文 OAI收割
International Symposium on Photoelectronic Detection and Imaging 2011: Advances in Infrared Imaging and Applications, May 24, 2011 - May 24, 2011, Beijing, China
作者: Li Y.; Zhang H.; Zhang H.; Li Y.; Li Y.

收藏 | 浏览/下载：40/0 | 提交时间：2013/03/25

As a result of the radar system got interferenced or in the state of half silent it can cause the guided precision drop badly In the modern electronic warfare therefore it can lead to the equipment depended on electronic guidance cannot strike the incoming goals exactly. It will need to rely on optoelectronic devices to make up for its shortcomings but when interference is in the process of radar leading especially the electro-optical equipment is influenced by the roll pitch and yaw rotation it can affect the target appear outside of the field of optoelectronic devices for a long time so the infrared optoelectronic equipment can not exert the superiority and also it cannot get across weapon-control system "reverse bring" missile against incoming goals. So the conventional ship-borne infrared system unable to track the target of incoming quickly the ability of optoelectronic rivalry declines heavily.Here we provide a brand new controlling algorithm for the semi-automatic searching and infrared tracking based on inertial navigation platform. Now it is applying well in our XX infrared optoelectronic searching and tracking system. The algorithm is mainly divided into two steps: The artificial mode turns into auto-searching when the deviation of guide exceeds the current scene under the course of leading for radar.When the threshold value of the image picked-up is satisfied by the contrast of the target in the searching scene the speed computed by using the CA model Least Square Method feeds back to the speed loop. And then combine the infrared information to accomplish the closed-loop control of the infrared optoelectronic system tracking. The algorithm is verified via experiment. Target capturing distance is 22.3 kilometers on the great lead deviation by using the algorithm. But without using the algorithm the capturing distance declines 12 kilometers. The algorithm advances the ability of infrared optoelectronic rivalry and declines the target capturing time by using semi-automatic searching and reliable capturing-tracking when the lead deviation of the radar is great. 2011 Copyright Society of Photo-Optical Instrumentation Engineers (SPIE).

The development and design of the gas-liquid two-phase flow-meter system based on DSP (EI CONFERENCE) 会议论文 OAI收割
2008 International Conference on Advanced Computer Theory and Engineering, ICACTE 2008, December 20, 2008 - December 22, 2008, Phuket, Thailand
Zhu J.-W.

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Recently as the fast development of the modern engineer the measuring problem of the gas and liquid is becoming prominence and many countries spend so much in the research. The system with which the thesis developed has realized data acquisition data compression and decompression a friendly human-machine interface RS232 serial communication reading or writing USB disk. The architecture of system is flexible. The thesis presents a research on the measurement process and the whole structure of the flow metering system and analyzes the schematic circuit of the main hardware modules 2008 IEEE.

The research for EO imaging system simulation (EI CONFERENCE) 会议论文 OAI收割
International Symposium on Photoelectronic Detection and Imaging, ISPDI 2007: Optoelectronic System Design, Manufacturing, and Testings, September 9, 2007 - September 12, 2007, Beijing, China
作者: Wang L.-J.; Zhang X.; Zhang X.; Zhang X.; Zhang J.-P.

收藏 | 浏览/下载：23/0 | 提交时间：2013/03/25

Electric-Optical (EO) imaging systems are modern systems especially the one consists of aspheric optics and image processing called wavefront coding system. The design concept of this kind system is totally different from the traditional image system. The trade-off between the complexity of the image deconvolution and the depth of focus extended should be considered. So we establish a simulation model consisting of optical optimization design system signal-to-noise ratio analysis and recovered image evaluation. The data can be exchanged among them. This simulation tools will be very useful in system design process.

Application of CMOS APS star tracker with large FOV in attitude and angular velocity determination (EI CONFERENCE) 会议论文 OAI收割
Advanced Sensor Systems and Applications III, November 12, 2007 - November 14, 2007, Beijing, China
Lu D.; Guang J.; Shaoju W.; Tao C.

收藏 | 浏览/下载：30/0 | 提交时间：2013/03/25

The paper deals with the spacecraft attitude determination problem using a new kind of star tracker with large FOV based on CMOS APS. Star tracker has been developed since 1970s and proved to be the most accurate sensor ever used in the spacecraft attitude determination systems. But the traditional CCD star tracker also has some disadvantages such as small FOV high power consumption low sample rate and low working angular rate limit which prevent the use of CCD star tracker in attitude large angle maneuvering process. The new kind of star tracker based on CMOS APS has no such disadvantages and is more applicable on modern low-cost agile small satellites. Its higher sample rate and working angular rate limit over traditional CCD star tracker make it more adapt for spacecraft angular velocity determination. Because of the large FOV of the star tracker the mathematical model of traditional CCD star tracker with a small FOV is not appropriate. So a new mathematical model was quoted to fit the star tracker with a large FOV. An alternative adaptive algorithm was also introduced in the paper. It can help the EKF algorithm work lacking of accurate covariance of the observation noise. An optimal estimation algorithm was used to estimate the angular velocity directly from the star tracker measurements. Mathematic simulation results indicate the CMOS APS star tracker can give accurate attitude information and estimated angular rate. The method can be used as the chief attitude determination system design of low-cost satellite without gyros or be used as a backup strategy in the event of gyro failures to enhance the reliability of the attitude determination system.