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：
	Constraining the X-Ray-Infrared Spectral Index of Second-timescale Flares from SGR 1935+2154 with Palomar Gattini-IR 期刊论文 OAI收割 The Astrophysical Journal, 2020, 卷号: 901, 页码: L7 作者: HXMT \| 收藏 \| 浏览/下载：27/0 \| 提交时间：2022/02/08 Radio transient sources Magnetars Soft gamma-ray repeaters 2008 992 1471 Astrophysics - High Energy Astrophysical Phenomena Astrophysics - Instrumentation and Methods for Astrophysics Abstract: The Galactic magnetar SGR 1935+2154 has been reported to produce the first example of a bright millisecond-duration radio burst (FRB 200428) similar to the cosmological population of fast radio bursts (FRBs). The detection of a coincident bright X-ray burst represents the first observed multiwavelength counterpart of an FRB. However, the search for similar emission at optical wavelengths has been hampered by the high inferred extinction on the line of sight. Here, we present results from the first search for second-timescale emission from the source at near-infrared (NIR) wavelengths using the Palomar Gattini-IR observing system in the J band, enabled by a novel detector readout mode that allows short exposure times of ?0.84 s with 99.9% observing efficiency. With a total observing time of ?12 hr (?47,728 images) during its 2020 outburst, we place median 3Ҡlimits on the second-timescale NIR fluence of ?18 Jy ms (13.1 AB mag). The corresponding extinction-corrected limit is ?125 Jy ms for an estimated extinction of A_J = 2.0 mag. Our observations were sensitive enough to easily detect an NIR counterpart of FRB 200428 if the NIR emission falls on the same power law as observed across its radio to X-ray spectrum. We report nondetection limits from epochs of four simultaneous X-ray bursts detected by the Insight-HXMT and NuSTAR telescopes during our observations. These limits provide the most stringent constraints to date on fluence of flares at 10¹⁴ Hz, and constrain the fluence ratio of the NIR emission to coincident X-ray bursts to R_NIR ? 0.025 (fluence index ?0.35).
	Coordinated Formation Design of Multi-Robot Systems via an Adaptive-Gain Super-Twisting Sliding Mode Method 期刊论文 OAI收割 APPLIED SCIENCES-BASEL, 2019, 卷号: 9, 期号: 20, 页码: 19 作者: Qian, Dianwei; Zhang, Guigang; Chen, Jiarong; Wang, Jian; Wu, Zhimin \| 收藏 \| 浏览/下载：50/0 \| 提交时间：2020/03/30 second order sliding mode control adaptive control formation control multiple robots super twisting law
	The Generalized Thermodynamic Temperature and the New Expressions of the First and the Second Law of Thermodynamics 期刊论文 OAI收割 2016 作者: Hu, Y. C., Chen, Q. and Hu, Y. Y. 收藏 \| 浏览/下载：21/0 \| 提交时间：2017/05/27 Generalized thermodynamic temperature First law of thermodynamics Second law of thermodynamics Generalized Carnot cycle Generalized Clausius
	Kinetics of FeSe2 oxidation by ferric iron and its reactivity compared with FeS2 期刊论文 OAI收割 SCIENCE CHINA-CHEMISTRY, 2014, 卷号: 57, 期号: 9, 页码: 1300-1309 作者: Ma Bin; Nie Zhe; Liu ChunLi; Kang MingLiang; Bardelli, Fabrizio \| 收藏 \| 浏览/下载：32/0 \| 提交时间：2019/04/09 High-level Radioactive Waste Disposal Ferroselite Oxidative Dissolution Second-order Rate Law
	Research on computer control strategy for optical electric tracking system (EI CONFERENCE) 会议论文 OAI收割 2011 IEEE International Conference on Mechatronics and Automation, ICMA 2011, August 7, 2011 - August 10, 2011, Beijing, China 作者: Li M. 收藏 \| 浏览/下载：25/0 \| 提交时间：2013/03/25 In this paper mathematic model and computer control strategy for optical electrical tracking system have been researched and discussed. First the system's structure and its work process have been analyzed. Second according to the system's moving law the system's mathematic model has been built. As to the computer control strategy trigger guiding two closed loop PID control method as well as compound control method have been applied to satisfy the tracking accuracy. Third we apply the bilinear transformation to get the digital system and the sample time is 800Hz. The simulation results indicate that the maximum tracking error can be limited to less than 0.5 and the regulator time can be 0.04s. Then the control project resonance frequency should be more than 200Hz and the sample frequency should be more than 400Hz to meet the control accuracy requirement. So we can conclude that the system indexes such as swiftness high accuracy as long as real time have been satisfied. And the requirement of mechanical property has been present which is very useful to mechanical working. 2011 IEEE.
	Energy, exergy, and Second Law performance criteria 期刊论文 OAI收割 ENERGY, 2007, 卷号: 32, 期号: 4, 页码: 281-296 作者: Lior, Noam; Zhang, Na 收藏 \| 浏览/下载：35/0 \| 提交时间：2015/12/18 thermodynamics efficiency exergy Second Law performance
	Equation of motion of a mass point in gravitational field and classical tests of gauge theory of gravity 期刊论文 OAI收割 COMMUNICATIONS IN THEORETICAL PHYSICS, 2007, 卷号: 47, 期号: 3, 页码: 503-511 作者: Wu N(吴宁); Zhang DH(张达华); Wu, N; Zhang, DH 收藏 \| 浏览/下载：30/0 \| 提交时间：2016/06/28 classical tests of gauge theory of gravity gauge theory of gravity classical solution of field equation Newton's second law of motion
	Effects of P/B on the properties of anticorrosive coatings with different particle size 期刊论文 OAI收割 PROGRESS IN ORGANIC COATINGS, 2005, 卷号: 53, 期号: 2, 页码: 91-98 作者: Yang, LH; Liu, FC; Han, EH \| 收藏 \| 浏览/下载：25/0 \| 提交时间：2021/02/02 pigment/binder ratio Nano-ZnO polyurethane anticorrosion properties fick's second law
	Entropy of Gibbons-Maeda dilaton black hole due to arbitrary spin fields 期刊论文 OAI收割 INTERNATIONAL JOURNAL OF THEORETICAL PHYSICS, 2003, 卷号: 42, 期号: 4, 页码: 827-836 作者: Shen, YG; Shen, YG , Chinese Acad Sci, Shanghai Astron Observ, Shanghai 200030, Peoples R China. \| 收藏 \| 浏览/下载：25/0 \| 提交时间：2012/08/29 Fermionic Entropy Quantum Corrections Space-time Statistical-mechanics Geometric Entropy Second Law Thermodynamics Gravity Area Renormalization