机构

• 地理科学与资源研究所 [8]
• 长春光学精密机械与物... [7]
• 青藏高原研究所 [1]

采集方式

• OAI收割 [16]

内容类型

• SCI/SSCI论文 [8]
• 会议论文 [7]
• 期刊论文 [1]

发表日期

• 2017 [1]
• 2016 [2]
• 2014 [1]
• 2013 [2]
• 2011 [2]
• 2010 [1]
• 更多

学科主题

• 地理学::自然地理学 [1]

筛选

浏览/检索结果: 共16条，第1-10条 帮助 条数/页： 5101520253035404550556065707580859095100 排序方式： 请选择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作者升序作者降序 Late-Holocene Indian summer monsoon variability revealed from a 3300-year-long lake sediment record from Nir'pa Co, southeastern Tibet 期刊论文  OAI收割 HOLOCENE, 2017, 卷号: 27, 期号: 4, 页码: 541-552 作者:  Lei, YB (Lei, Yanbin);  Bird, BW (Bird, Broxton W.);  Perello, M (Perello, Melanie);  Polissar, PJ (Polissar, Pratigya J.);  Yao, TD (Yao, Tandong)   |  收藏  |  浏览/下载：34/0  |  提交时间：2018/07/16 TROPICAL PACIFIC-OCEAN  LAST 2 MILLENNIA  EL-NINO  ENVIRONMENTAL-CHANGES  ASIAN MONSOON  ICE-AGE  NAM-CO  PLATEAU  CLIMATE  RAINFALL   Spatial patterns of precipitation anomalies in eastern China during centennial cold and warm periods of the past 2000 years SCI/SSCI论文  OAI收割 2016 作者:  Hao Z. X.;  Zheng, J. Y.;  Zhang, X. Z.;  Liu, H. L.;  Li, M. Q.   |  收藏  |  浏览/下载：22/0  |  提交时间：2017/11/09 centennial cold/warm periods  historical records  precipitation  anomalies  spatial patterns  eastern China  asian summer monsoon  tropical northern-hemisphere  last 2 millennia  temperature  variability  climate  reconstructions  medieval  drought   Recent advances on reconstruction of climate and extreme events in China for the past 2000 years SCI/SSCI论文  OAI收割 2016 作者:  Ge Q. S.;  Zheng, J. Y.;  Hao, Z. X.;  Liu, Y.;  Li, M. Q.   |  收藏  |  浏览/下载：26/0  |  提交时间：2017/11/09 high-resolution paleoclimatic reconstruction  extreme events  China  2000 years  qinghai-tibetan plateau  asian summer monsoon  tree-ring width  northern-hemisphere temperature  low-frequency variability  last 2  millennia  qilian mountains  eastern china  lower reaches  high-resolution   Drought variability at the northern fringe of the Asian summer monsoon region over the past millennia SCI/SSCI论文  OAI收割 2014 作者:  Zhao Y.;  Zhao Y. 收藏  |  浏览/下载：48/0  |  提交时间：2014/12/24 Tree rings  Drought  Palmer drought severity index  The Asian summer  monsoon  Past climate change  Regional climate dynamics  low-frequency variability  pacific sst variability  last 2 millennia  tree-ring  temperature variability  hemisphere temperature  atlantic  oscillation  tibetan plateau  severity index  central china   Temperature changes over the past 2000 yr in China and comparison with the Northern Hemisphere SCI/SSCI论文  OAI收割 2013 Ge Q.; Hao Z.; Zheng J.; Shao X. 收藏  |  浏览/下载：164/0  |  提交时间：2014/12/24 last 2 millennia  tibetan plateau  ice cores  reconstruction  variability  climate  series  record  middle  age   Temperature and precipitation control of the spatial variation of terrestrial ecosystem carbon exchange in the Asian region SCI/SSCI论文  OAI收割 2013 Chen Z.; Yu G. R.; Ge J. P.; Sun X. M.; Hirano T.; Saigusa N.; Wang Q. F.; Zhu X. J.; Zhang Y. P.; Zhang J. H.; Yan J. H.; Wang H. M.; Zhao L.; Wang Y. F.; Shi P. L.; Zhao F. H. 收藏  |  浏览/下载：30/0  |  提交时间：2014/12/24 Terrestrial ecosystem  Spatial variation  Carbon exchange fluxes  Climate controlling factors  Carbon source/sink strength  Asian region  last 2 decades  atmospheric co2  water-vapor  east-asia  soil  respiration  interannual variability  tropical forests  dioxide  china  flux   Design of motion compensation mechanism of satellite remote sensing camera (EI CONFERENCE) 会议论文  OAI收割 International Symposium on Photoelectronic Detection and Imaging 2011: Space Exploration Technologies and Applications, May 24, 2011 - May 26, 2011, Beijing, China Gu S.; Yan Y.; Xu K.; Jin G. 收藏  |  浏览/下载：49/0  |  提交时间：2013/03/25 With the development of aerospace remote sensing technology  the ground resolution of remote sensing camera enhances continuously. Since there is relative motion between camera and ground target when taking pictures  the target image recorded in recording media is moved and blurred. In order to enhance the imaging quality and resolution of the camera  the image motion had to be compensated. In order to abate the effect of image motion to image quality of space camera and improve the resolution of the camera  the compensation method of image motion to space camera is researched. First  the reason of producing drift angle and adjustment principle are analyzed in this paper. This paper introduce the composition and transmission principle of image motion compensation mechanism. Second  the system adopts 80C31 as controller of drift angle  and adopts stepping motor for actuators  and adopts absolute photoelectric encoder as the drift Angle measuring element. Then the control mathematical model of the image motion compensation mechanism are deduced  and it achieve the closed-loop control of the drift angle position. At the last  this paper analyses the transmission precision of the mechanism. Through the experiment  we measured the actual precision of the image motion compensation mechanism  and compared with the theoretical analysis. There are two major contributions in this paper. First  the traditional image motion compensation mechanism is big volume and quality heavy. This has not fit for the development trend of space camera miniaturization and lightweight. But if reduce the volume and quality of mechanism  it will bring adverse effects for the precision and stiffness of mechanism. For this problem  This paper designed a image motion compensation that have some advantages such as small size  light weight at the same time  high precision  stiffness and so on. This image motion compensation can be applicable to the small optics cameras with high resolution. Second  the traditional mechanism control need to corrected  fitting and iterative for the control formula of mechanism. Only in this way  we can get the optimal control mathematical model. This paper has high precision of the control formula derived. It can achieve the high precision control without fitting  It also simplify the difficulty of control mathematical model establishment. This paper designed the range of adjusting of image motion compensation mechanism between -5 +5. Based on choosing-5  -4  -3  -2  -1  0  +1  +2  +3  +4  +4 as the expectation value of the imaginary drift angle  we get ten groups of the fact data in adjusting drift angle measured. The test results show that the precision of the drift angle control system can be achieved in 1. It can meet the system requirements that the precision of the control system is less than 3'  and it can achieve the high-precision image motion compensation. 2011 SPIE.   Brazing RB-SiC used in large aperture space optical system (EI CONFERENCE) 会议论文  OAI收割 2011 International Conference on Materials and Products Manufacturing Technology, ICMPMT 2011, October 28, 2011 - October 30, 2011, Chengdu, China Zhang B.; Zhang Z. 收藏  |  浏览/下载：27/0  |  提交时间：2013/03/25 Because of the sic material's superior optical characteristic  machine characteristic and hot characteristic  it becomes currently the space big aperture reflector choose firstly1. For larger aperture sic mirror  it is not economical and safe to make the monolithic body directly 2  3. The SiC mirror brazed assembly with several segments can solve these problems. In this paper  one 600 mm sic plane mirror as demonstration welded with 3 radial segments is roughly grinded to the required figure at first  then the mirror is finely grinded and polished by the technology of CCOS  the mirror figure error is less than 1/20 ( = 632.8nm) in RMS finally. The problems of the preferential removal near braze joint are solved. The methods of reducing the residual stress of mirror are discussed. At last  some measurements and experiments are carried on  and the results conclude that the brazed SiC mirror can meet the requirement of large aperture optical systems. (2011) Trans Tech Publications.   Dynamic responses of terrestrial ecosystems structure and function to climate change in China SCI/SSCI论文  OAI收割 2010 作者:  Zhang Z. 收藏  |  浏览/下载：35/0  |  提交时间：2012/06/08 global vegetation model  last glacial maximum  leaf-area index  carbon  balance  biosphere model  forest ecosystems  plant geography  water-balance  co2  storage   Storage and compression design of high speed CCD (EI CONFERENCE) 会议论文  OAI收割 4th International Symposium on Advanced Optical Manufacturing and Testing Technologies: Optical Test and Measurement Technology and Equipment, November 19, 2008 - November 21, 2008, Chengdu, China Cai X.; Zhai L. P. 收藏  |  浏览/下载：65/0  |  提交时间：2013/03/25 In current field of CCD measurement  large area and high resolution CCD is used to obtain big measurement image  so that  speed and capacity of CCD requires high performance of later storage and process system. The paper discusses how to use SCSI hard disk to construct storage system and use DSPs and FPGA to realize image compression. As for storage subsystem  Because CCD is divided into multiplex output  SCSI array is used in RAID0 way. The storage system is composed of high speed buffer  DMA controller  control MCU  SCSI protocol controller and SCSI hard disk. As for compression subsystem  according to requirement of communication and monitor system  the output is fixed resolution image and analog PAL signal. The compression means is JPEG2000 standard  in which  9/7 wavelets in lifting format is used. 2 DSPs and FPGA are used to compose parallel compression system. The system is composed of FPGA pre-processing module  DSP compression module  video decoder module  data buffer module and communication module. Firstly  discrete wavelet transform and quantization is realized in FPGA. Secondly  entropy coding and stream adaption is realized in DSPs. Last  analog PAL signal is output by Video decoder. Data buffer is realized in synchronous dual-port RAM and state of subsystem is transfer to controller. Through subjective and objective evaluation  the storage and compression system satisfies the requirement of system. 2009 SPIE.