中国科学院机构知识库网格系统: 检索

浏览/检索结果: 共9条，第1-9条

帮助

条数/页：排序方式：
	Simulation of Soil Organic Carbon Content Based on Laboratory Spectrum in the Three-Rivers Source Region of China 期刊论文 OAI收割 REMOTE SENSING, 2022, 卷号: 14, 期号: 6, 页码: 20 作者: Zhou, Wei; Li, Haoran; Wen, Shiya; Xie, Lijuan; Wang, Ting \| 收藏 \| 浏览/下载：40/0 \| 提交时间：2022/09/21 soil organic carbon visible-near infrared spectroscopy characteristic band extreme gradient boosting Tibetan plateau
	Simulation of Soil Organic Carbon Content Based on Laboratory Spectrum in the Three-Rivers Source Region of China 期刊论文 OAI收割 REMOTE SENSING, 2022, 卷号: 14, 期号: 6, 页码: 20 作者: Zhou, Wei; Li, Haoran; Wen, Shiya; Xie, Lijuan; Wang, Ting \| 收藏 \| 浏览/下载：23/0 \| 提交时间：2022/09/21 soil organic carbon visible-near infrared spectroscopy characteristic band extreme gradient boosting Tibetan plateau
	No pulsed radio emission during a bursting phase of a Galactic magnetar 期刊论文 OAI收割 Nature, 2020, 卷号: 587, 页码: 63-65 作者: HXMT \| 收藏 \| 浏览/下载：44/0 \| 提交时间：2022/02/08 Astrophysics - High Energy Astrophysical Phenomena Abstract: Fast radio bursts (FRBs) are millisecond-duration radio transients of unknown physical origin observed at extragalactic distances^1-3. It has long been speculated that magnetars are the engine powering repeating bursts from FRB sources^4-13, but no convincing evidence has been collected so far¹⁴. Recently, the Galactic magnetar SRG 1935+2154 entered an active phase by emitting intense soft íray bursts¹⁵. One FRB-like event with two peaks (FRB 200428) and a luminosity slightly lower than the faintest extragalactic FRBs was detected from the source, in association with a soft íray/hard-X-ray flare^18-21. Here we report an eight-hour targeted radio observational campaign comprising four sessions and assisted by multi-wavelength (optical and hard-X-ray) data. During the third session, 29 soft-íray repeater (SGR) bursts were detected in íray energies. Throughout the observing period, we detected no single dispersed pulsed emission coincident with the arrivals of SGR bursts, but unfortunately we were not observing when the FRB was detected. The non-detection places a fluence upper limit that is eight orders of magnitude lower than the fluence of FRB 200428. Our results suggest that FRB-SGR burst associations are rare. FRBs may be highly relativistic and geometrically beamed, or FRB-like events associated with SGR bursts may have narrow spectra and characteristic frequencies outside the observed band. It is also possible that the physical conditions required to achieve coherent radiation in SGR bursts are difficult to satisfy, and that only under extreme conditions could an FRB be associated with an SGR burst.
	Ground-based measurement of the space object temperature (EI CONFERENCE) 会议论文 OAI收割 5th International Symposium on Advanced Optical Manufacturing and Testing Technologies: Large Mirrors and Telescopes, April 26, 2010 - April 29, 2010, Dalian, China 作者: Wu Y.-H.; Wang J.-L.; Wang J.-L. 收藏 \| 浏览/下载：71/0 \| 提交时间：2013/03/25 Multi-band IR data of the space object can be used in the fields of object identification and space surveillance. The radiation characteristics of the object can be obtained by analyzing these data. These characteristics include temperature area emissivity absorptivity reflectivity and temporal trends. The infrared radiation temperature of the space object is an important characteristic from which the object's working state in orbit can be judged. We apply the method of measuring the spectral distribution of the object and fit the data to the Planck formula to determine the temperature. In order to improve the precision of measuring temperature on the space object we optimize the centric wavelength and the bandwidth effectively. Also we use a simple program to implement temperature measurement. 2010 Copyright SPIE - The International Society for Optical Engineering.
	THE INFLUENCES OF TEMPERATURE AND CHAIN-CHAIN INTERACTION ON FEATURES OF SOLITONS EXCITED IN alpha-HELIX PROTEIN MOLECULES WITH THREE CHANNELS 期刊论文 OAI收割 International Journal of Modern Physics B, 2009, 卷号: 23, 期号: 10, 页码: 2303-2322 X. F. Pang; M. J. Liu 收藏 \| 浏览/下载：26/0 \| 提交时间：2012/04/13 Soliton feature bio-energy transport protein molecule temperature Runge-Kutta method transported bio-energy davydov soliton improved model characteristic parameters thermodynamic properties biological temperature finite-temperature vibron solitons living systems polaron band
	Features of Motion of Soliton Transported Bio-energy in Aperiodic alpha-Helix Protein Molecules with Three Channels 期刊论文 OAI收割 Communications in Theoretical Physics, 2009, 卷号: 51, 期号: 1, 页码: 170-180 X. F. Pang; M. J. Liu 收藏 \| 浏览/下载：29/0 \| 提交时间：2012/04/13 structure aperiodicity soliton stability protein bio-energy Runge-Kulta method davydov soliton finite-temperature improved model characteristic parameters thermodynamic properties biological temperature vibron solitons living systems polaron band heat bath
	Characteristic parameters measurement of a 3mm band radiometer 期刊论文 OAI收割 JOURNAL OF INFRARED AND MILLIMETER WAVES , 2007, 卷号: 26, 期号: 2, 页码: 129-132 Peng Shu-Sheng; Wu Li; Yin Xing-Hui 收藏 \| 浏览/下载：16/0 \| 提交时间：2012/02/04 3mm band radiometer characteristic parameter aperture calibration
	Properties of soliton-transported bio-energy in alpha-helix protein molecules with three channels 期刊论文 OAI收割 Communications in Theoretical Physics, 2007, 卷号: 48, 期号: 2, 页码: 369-376 X. F. Pang; M. J. Liu 收藏 \| 浏览/下载：27/0 \| 提交时间：2012/04/13 bio-energy transport soliton protein molecule Runge-Kutta method thermal stabilization davydov soliton finite-temperature improved model characteristic parameters thermodynamic properties biological temperature living systems polaron band heat bath quantum
	Theoretical analysis of 980nm high power Vertical External-cavity Surface-emitting Semiconductor Laser (VECSEL) (EI CONFERENCE) 会议论文 OAI收割 ICO20: Lasers and Laser Technologies, August 21, 2005 - August 26, 2005, Changchun, China 作者: Wang L.-J.; Wang L.-J.; Ning Y.-Q.; Qin L. 收藏 \| 浏览/下载：23/0 \| 提交时间：2013/03/25 By using bottom-emitting structure we will develop laser diode (LD) pumped 980 nm VECSEL with active region of InGaAs/GaAsP/AlGaAs system. Because the thickness of barrier layer and absorption layer exceed that of quantum well single well approximation model (KP method) can be used to calculate the band structure of VECSEL. The Schrodinger equation of finite deep potential well can be adopted to calculate the energy level structures of electron heavy and light holes. According to the transition selection rule we theoretically obtained the emitting wavelength of VECSEL and calculated quasi-Femi energy of valence band and conduction band based on the analysis of energy level structure of electron and holes. By analyzing the gain of strained quantum wells we calculated the gain of VECSEL using transition matrix elements of electron heavy and light holes. We give out the threshold gain output power and other characteristic parameters. We will study the configuration of VECSEL and pumping scheme. We designed external cavity mirror active region and bottom-emitting structure. A LD-pumped vertical external cavity surface-emitting laser whose output power is greater than 1.0 W can be predicted.