中国科学院机构知识库网格系统: 检索

Architecture Design and Ground Performance of Netherlands-China Low-Frequency Explorer 期刊论文 OAI收割
RADIO SCIENCE, 2024, 卷号: 59, 期号: 8
作者: Karapakula, Sukanth; Brinkerink, Christiaan; Vecchio, Antonio; Pourshaghaghi, Hamid R.; Dolron, Peter

|

收藏 | 浏览/下载：4/0 | 提交时间：2024/08/26

very low frequency radio receivers NCLE monopole antenna lunar observatory radio observations from the Moon

Synchronous X-ray/Optical QPOs from the Black Hole LMXB MAXI J1820+070 期刊论文 OAI收割
Monthly Notices of the Royal Astronomical Society, 2021
作者: HXMT

|

收藏 | 浏览/下载：52/0 | 提交时间：2022/02/08

black hole physics Low Mass X-ray Binaries accretion accretion discs stars: individual (MAXI J1820+070) Astrophysics - High Energy Astrophysical Phenomena Abstract: We present high-speed optical photometry from SAAO and SALT on the black hole LMXB MAXI J1820+070 (ASSASN-18ey), some of it simultaneous with NICER, Swift and Insight-HXMT X-ray coverage. We detect optical Quasi-Periodic Oscillations (QPOs) that move to higher frequencies as the outburst progresses, tracking both the frequency and evolution of similar X-ray QPOs previously reported. Correlated X-ray/optical data reveal a complex pattern of lags, including an anti-correlation and a sub-second lag that evolve over the first few weeks of outburst. They also show correlated components separated by a lag equal to the QPO period roughly centered on zero lag, implying that the inter-band variability is strongly and consistently affected by these QPOs at a constant phase lag of roughly ±Ю The synchronisation of X-ray and optical QPOs indicates that they must be produced in regions physically very close to each other we thus propose that they can be explained by a precessing jet model, based on analogies with V404 Cyg and MAXI J1348-630.

Modeling and analysis of NWC signal propagation amplitude based on LWPC and IRI models 期刊论文 OAI收割
CHINESE JOURNAL OF GEOPHYSICS-CHINESE EDITION, 2019, 卷号: 62, 期号: 9, 页码: 3223-3234
作者: Yi Juan; Gu XuDong; Li ZhiPeng; Lin RenTong; Cai YiHui

|

收藏 | 浏览/下载：50/0 | 提交时间：2020/05/18

NWC very low frequency (VLF) transmitter signals Long Wavelength Propagation Capability (LWPC) model International Reference Ionosphere (IRI) model Communication and navigation

Effects of strength level and loading frequency on very-high-cycle fatigue behavior for a bearing steel 期刊论文 OAI收割
INTERNATIONAL JOURNAL OF FATIGUE, 2012, 卷号: 38, 页码: 46-56
作者: Zhao AG(赵爱国); Xie JJ(谢季佳); Sun CQ(孙成奇); Lei ZQ(雷铮强); Hong YS(洪友士)

收藏 | 浏览/下载：64/0 | 提交时间：2013/01/18

Very-high-cycle fatigue Strength level Frequency effect Crack initiation Fatigue mechanism S-N Curve Subsurface Crack Initiation Low-Alloy Steel Gigacycle Fatigue Life Regime Mechanism Failure KHz

Multi-parameters decoupling method with Lamb wave sensor for improving the selectivity of label-free liquid detection (EI CONFERENCE) 会议论文 OAI收割
2011 16th International Solid-State Sensors, Actuators and Microsystems Conference, TRANSDUCERS'11, June 5, 2011 - June 9, 2011, Beijing, China
作者: Zhou L.

收藏 | 浏览/下载：24/0 | 提交时间：2013/03/25

The anti-symmetric modes (A01 mode for low frequency A 03 mode for high frequency) and symmetric modes (S0 mode) produced by Lamb wave sensor are used to detect multi-parameters of a liquid such as its density sound velocity and viscosity. These modes are found to be very different to the parameters. For example the A01 mode is very sensitive to the liquid's density but the A03 mode is sensitive to its sound velocity. The measurements of the attenuation with S0 mode can give out liquid's viscosity after its density been determined by A 01 mode. That could be a way to distinguish an unknown liquid with high sensitivity or to solve the problem of the selectivity of label free detection on biosensors. 2011 IEEE.

A new image fusion algorithm based on wavelet transform (EI CONFERENCE) 会议论文 OAI收割
2010 3rd International Conference on Advanced Computer Theory and Engineering, ICACTE 2010, August 20, 2010 - August 22, 2010, Chengdu, China
作者: He X.; Zhang Y.; Zhang L.-G.; Zhang L.-G.

收藏 | 浏览/下载：13/0 | 提交时间：2013/03/25

A new image fusion algorithm based on lifting wavelet transform is presented in this paper. The source images are decomposed using lifting wavelet transform respectively. Aiming at the coefficients of low frequency and high frequency this algorithm choose a different rule to fuse the image. To the low frequency the spatial frequency based on the neighborhood add consistency check is elected as the fusion guide. And the absolute maximum based on detail coefficients is selected as the guide to the high frequency. After that the fused image is obtained by using inverse lifting wavelet transform. Taking the ratio space frequency error and the mean gradient as criterions experimental results demonstrate that the algorithm is very effective. 2010 IEEE.

An Approximate Method For Calculation Of Fluid Force And Response Of A Circular Cylinder At Lock-In 期刊论文 OAI收割
China Ocean Engineering, 2008, 页码: 371-384
作者: Wang Y(王艺)

收藏 | 浏览/下载：563/28 | 提交时间：2009/08/03

Vortex-Induced Virbration Circular Cyclinder Lock-In Phase Lift Amplitude Vortex-Induced Vibrations Very-Low Mass Added-Mass Frequency Dynamics

Design of high-resolution fourier transform lens (EI CONFERENCE) 会议论文 OAI收割
3rd International Symposium on Advanced Optical Manufacturing and Testing Technologies, AOMATT 2007: Advanced Optical Manufacturing Technologies, July 8, 2007 - July 12, 2007, Chengdu, China
作者: Zhang L.; Zhang L.

收藏 | 浏览/下载：25/0 | 提交时间：2013/03/25

With the development of optical information processing high-resolution Fourier transform lens has often been used in holographic data storage system spatial filtering and observation of particles. This paper studies the optical design method of high-resolution Fourier transform optical lenses system which could be used in particles observation and holographic data storage system. According to Fourier transform relation between object and its frequency plane and the theory of geometrical optics the system with working wavelength 532nm and resolution 3 m was designed based on ZEMAX. A multi-configuration method was adopted to optimize the system's lenses. In the optical system a diaphragm was placed at the system's spectrum plane and the system demanded a low vacuum to cut down the influences of atmosphere and other particles. The result of finite element analysis indicated that the influences of vacuum pumping to optics spacing and mirror surface shape very minor and the imaging quality not being affected. This system has many advantages such as simple structure good image quality and a high resolution of 3 m. So it has a wide application prospect and can be used both in holographic data storage system and particles observation.

Magnetic field integral equation at very low frequencies 期刊论文 OAI收割
Ieee Transactions on Antennas and Propagation, 2003, 卷号: 51, 期号: 8, 页码: 1864-1871
Zhang, Y. H.; Cui, T. J.; Chew, W. C.; Zhao, J. S

收藏 | 浏览/下载：20/0 | 提交时间：2014/05/04

electric field integral equation (EFIE) electromagnetic (EM) scattering loop/tree basis magnetic field integral equation (MFIE) Rao-Wilton-Glisson (RWG) basis very low frequency arbitrary shape scattering

Linear bunchers and half-frequency bunching method 期刊论文 OAI收割
NUCLEAR INSTRUMENTS & METHODS IN PHYSICS RESEARCH SECTION A-ACCELERATORS SPECTROMETERS DETECTORS AND ASSOCIATED EQUIPMENT, 2000, 卷号: 455, 期号: 12, 页码: 533-538
作者: Tang, JY; Jiang, JZ; Shi, AM; Yin, ZK; Wang, YF

|

收藏 | 浏览/下载：15/0 | 提交时间：2010/10/29

very low energy beam transfer linear buncher half-frequency bunching high-voltage direct forming method