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浏览/检索结果: 共9条,第1-9条 帮助

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Rate of vegetation change in southeast China during the Holocene and its potential drivers 期刊论文  OAI收割
REVIEW OF PALAEOBOTANY AND PALYNOLOGY, 2024, 卷号: 322, 页码: 10
作者:  
  |  收藏  |  浏览/下载:21/0  |  提交时间:2024/04/19
An experimental study on the influence of cooling rates on salt expansion in sodium sulfate soils 期刊论文  iSwitch采集
COLD REGIONS SCIENCE AND TECHNOLOGY, 2016, 卷号: 124, 页码: 67-76
作者:  
Lai, Yuanming;  Wan, Xusheng;  Zhang, Mingyi
收藏  |  浏览/下载:32/0  |  提交时间:2019/10/09
Mid-late Pleistocene glacial evolution in the Grove Mountains, East Antarctica, constraints from cosmogenic Be-10 surface exposure dating of glacial erratic cobbles 期刊论文  OAI收割
QUATERNARY SCIENCE REVIEWS, 2016, 卷号: 145, 期号: 0, 页码: 71-81
作者:  
Dong, GC (Dong, Guocheng);  Huang, FX (Huang, Feixin);  Caffee, MW (Caffee, Marc W.);  Huang, FX;  Yi, CL (Yi, Chaolu)
  |  收藏  |  浏览/下载:31/0  |  提交时间:2017/09/26
Glacial HisTories From The East Antarctic Ice Sheet (Eais) Provide Keys To UnderstAndIng Correlations Between The Eats And Global Climate. They Are Especially Helpful In The Assessment Of Global Sea Level Change  And As a Means Of Quantifying The Magnitude Of pAst Glacial Activity And The RAte At Which Ice Responded To climAte Change. Given The Significance Of Eais Glacial hisTories  It Is Imperative That More Glacial Chronologic Data For thIs Region Be Obtained  Especially For The Mid-to-lAte Pleistocene. We Report Cosmogenic Be-10 Surface Exposure DAtIng Results From Glacially Transported Cobbles Embedded In Blue-ice moraIne MAterial At Mount hardIng  The Grove Mountains  Eais. Forty Exotic Cobbles Sampled AlOng Two PrOfiles (a And b) On This Blue-ice MoraIne Present Apparent Exposure-ages RangIng From 7.2 To 542.2 Ka. We Explore This Scattered Dataset By UsIng PrIncipal compOnent Analysis (Pca) To Identify Statistically Significant Trends In The Data. We Identify a correlatiOn betWeen Exposure-age And Distance Of The Cobbles From Mount hardIng. In prOfile a  Cobbles Further From Mount HardIng Yield Older Exposure-ages Than Those That Are Relatively Close. In Profile b  Cobbles Closer To Mount HardIng Are Found To Have Relatively Older Exposure-ages. In Term Of Glacial hisTory We Suggest That The Direction Of Ice Flow Changed durIng The Period From Similar To 60 To 200 Ka  And That Multiple Glacial Fluctuations Occurred In The Mid-late Pleistocene. (c) 2016 Elsevier Ltd. All Rights Reserved.  
Close correlation between global air temperature change and polar motion during 1962-2013 SCI/SSCI论文  OAI收割
2016
作者:  
Huang M.;  Zhu, L.;  Gong, H.;  Shao, Y. P.
  |  收藏  |  浏览/下载:16/0  |  提交时间:2017/11/09
Chronology of Holocene sediments from the archaeological Salawusu site in the Mu Us Desert in China and its palaeoenvironmental implications 期刊论文  OAI收割
JOURNAL OF ASIAN EARTH SCIENCES, 2012, 卷号: 45, 页码: 247-255
作者:  
Liu, Kai;  Lai, ZhongPing
  |  收藏  |  浏览/下载:20/0  |  提交时间:2018/06/20
Simulation of the Decadal Permafrost Distribution on the Qinghai-Tibet Plateau (China) over the Past 50 Years SCI/SSCI论文  OAI收割
2012
Cheng W. M.; Zhao S. M.; Zhou C. H.; Chen X.
收藏  |  浏览/下载:23/0  |  提交时间:2014/12/25
Recent Carbon Accumulation in Changbai Mountain Peatlands, Northeast China SCI/SSCI论文  OAI收割
2010
Bao K. S.; Yu X. F.; Jia L.; Wang G. P.
收藏  |  浏览/下载:30/0  |  提交时间:2012/06/08
Study on experiment of grinding SiC mirror with fixed abrasive (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:  
Wang X.;  Zhang X.-J.;  Wang X.;  Wang X.
收藏  |  浏览/下载:24/0  |  提交时间:2013/03/25
A brand-new technology for manufacturing SiC reflecting mirror that is different from the traditional method is adopted  which is called as fixed abrasive surfacing technology. Not only the new method achieves better mirror quality with bigger diamond in diameter quickly  but also because of the fixed motion between the abrasive and workpiece and it will be good for surface finishing. During experiment  material removal characteristic which is on SiC under certain rotation speed and pressure by W7  W5  W3.5  W1.5 pellets has been tested. Through those removal curves  we come to a conclusion that the technology not only has a higher removal rate  but also has much more stability. In addition  the surface roughness experiment is mentioned. In the first stage  we achieved a mirror with surface roughness 42.758nm rms with W7 pellets. The surface roughness is descending as we change pellets with smaller diamond in diameter . At the end of experiment  a smooth surface with roughness 1.591nm rms has been achieved after using W1.5 pellets. Experiment results indicate that the technology which manufactures SiC reflecting mirror with fixed abrasive is able to replace the traditional slurry abrasive completely in certain finishing phase and also has a great foreground in application. 2009 SPIE.  
A high-speed acquisition and processing system of the laser speckle signal on the magnetic fluid (EI CONFERENCE) 会议论文  OAI收割
International Symposium on Photoelectronic Detection and Imaging 2009: Laser Sensing and Imaging, June 17, 2009 - June 19, 2009, Beijing, China
作者:  
Sun Y.;  Sun Y.;  Wan Q.-H.
收藏  |  浏览/下载:29/0  |  提交时间:2013/03/25
In order to achieve the dynamical detection and real-time analysis of the movement status of the magnetic fluid  according to the difficulties of the detection of the magnetic fluid  established a high-speed acquisition and processing system of laser speckle signal on the magnetic fluid. First of all  the FPGA (EP2C8T144C8N) drived the linear array CCD(TCD1501D) to scan in the corresponding time sequence given by the computer  collected the laser speckle interferometric image in rapid change on the surface of the magnetic fluid  which followed the movement of the magnetic fluid  and the signal collected by CCD was converted into the digital data through the high-speed A/D convertor and stored into the internal buffer FIFO of the FPGA  whose width and depth were designed by the user as required. Then  the FPGA sent the digital signal of the laser speckle interferometric images into the computer through the USB2.0 highspeed differential bus  whose transmission rate can reach 480Mb/s in theory. Finally  the distribution of the laser speckle on the magnetic fluid was messy and random  which carried certain information about the surface of the magnetic fluid  based on the theories of the statistic correlation and the subdivision of images  analysing and processing the laser speckle interferometric images  indirectly got the movement status of the magnetic fluid under the electromagnetic field. The experimental results show that: the High Speed Acquisition and Processing System has the advantage of full-court  non-contact  non-invasive  high-precision and high reliability and so on. The detection resolution of high speed acquisition and processing system is superior to 1m and the sample rate is 3Msps  which basically meets the requirements of the magnetic fluid movement state detection. 2009 SPIE.