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中国科学院国家天文台研究人员成功模拟SNR在前身星星风中射电演化（图）
中国科学院国家天文台 研究人员 SNR 前身 星星风 射电演化
2018/11/27
超新星遗迹是超新星爆发后与周围介质相互作用产生的一类天体，研究超新星遗迹可以帮助我们理解超新星的前身星模型和爆发模型，限制星系元素丰度和尘埃模型，分析宇宙线加速机制。然而多年来，一个最基本的问题却一直处于模棱两可的状态，那就是超新星遗迹多样化的射电形态是如何演变而来的。经过长期的努力攻关，最近国家天文台天体物理综合研究团组科研人员综合考虑星际磁场、前身星的星风和自行对遗迹演化的影响，利用大型软件包...
Comparative Analysis of SNR for Image Sensors with Enhanced Dynamic Range
CMOS Image sensor CCD Wide Dynamic Range APS Pixel level ADC
2015/8/17
Dynamic range is a critical figure of merit for image sensors. Often a sensor with higher dynamic range is regarded as higher quality than one with lower dynamic range. For CCD and CMOS sensors operat...
VLA and XMM-Newton Observations of the SNR W41/TeV Gamma-Ray Source HESS J1834–087
W41 HESS
2014/12/23
The recently discovered extended TeV source HESS J1834-087 is associated with both a diffuse X-ray enhancement and a molecular cloud, projected at the center of an old radio supernova remnant, G23.3-0...
Radio and X-ray images of the SNR G18.8+0.3 interacting with molecular clouds
Radio X-ray images
2014/12/23
New HI images from the VLA Galactic Plane Survey (VGPS) show clear absorption features associated with the supernova remnant (SNR) G18.8+0.3. High-resolution 13CO images reveal that molecular clouds o...
X-Ray Timing Observations of PSR J1930+1852 in the Crab-like SNR G54.1+0.3
PSR J1930+1852 remnants
2014/12/23
We present new X-ray timing and spectral observations of PSR J1930+1852, the young energetic pulsar at the center of the nonthermal supernova remnant G54.1+0.3. Using data obtained with the Rossi X-Ra...
Profiling power attacks like Template attack and Stochastic attack optimizes their performance by jointly evaluating the leakages of multiple sample points. However, such multivariate approaches are r...
低SNR海天线提取算法
低信噪比 海天线提取 算法
2016/9/2
针对海天线SNR低且有一定倾角难于提取的问题，提出一种新的海天线提取算法。在预处理阶段，利用Laplacian模板对海面的波纹进行增强，然后使用顺序滤波与数学形态学相结合的方法增加海面波纹的面积与灰度，预处理后增大了海面与天空的灰度差，海天线的SNR提升70%以上；最后，设计了一种斜线查找矩阵，通过对图像行扫描生成该矩阵，矩阵最大值的横纵坐标即为海天线的位置和角度。实测数据的试验结果验证了该方法的...
The mutual information of bit-interleaved coded modulation (BICM) systems, sometimes called the BICM capacity, is investigated at low signal-to-noise ratio (SNR), i.e., in the wideband regime. A new l...
PSR J0007+7303 in the CTA1 SNR: New Gamma-ray Results from Two Years of Fermi-LAT Observations
CTA1 SNR:Gamma-ray Results Fermi-LAT Observations
2011/10/12
One of the main results of the Fermi Gamma-Ray Space Telescope is the discovery of {\gamma}-ray selected pulsars. The high magnetic field pulsar, PSR J0007+7303 in CTA1, was the first ever to be disco...
Achieving a vanishing SNR-gap to exact lattice decoding at a subexponential complexity
SNR-gap subexponential complexity Information Theory
2011/9/15
Abstract: The work identifies the first lattice decoding solution that achieves, in the general outage-limited MIMO setting and in the high-rate and high-SNR limit, both a vanishing gap to the error-p...
HESS J1858+020 is a TeV gamma-ray source that was reported not to have any clear cataloged counterpart at any wavelength. However, it has been recently proposed that this source is indirectly associat...
A Detailed Study of the Molecular and Atomic Gas Toward the γ-ray SNR RX J1713.7-3946: Spatial TeV γ-ray and ISM Gas Correspondence
McClure-Griffi ths G. Rowel T. Inoue S. Inutsuka A. Kawamura
2011/9/27
RX J1713.7-3946 is the most remarkable TeV {\gamma}-ray SNR which emits {\gamma}-rays in the highest energy range 10-100 TeV. We made a combined analysis of CO and HI in the SNR and derived the total ...
Two-Step Acceleration Model of Cosmic Rays at Middle-Aged SNR
High Energy Astrophysical Phenomena (astro-ph.HE
2010/12/24
Recent gamma-ray observations of middle-aged supernova remnants revealed a mysterious broken power-law spectrum. Using three-dimensional magnetohydrodynamics simulations, we show that the interaction ...
Finite-SNR Diversity-Multiplexing Tradeoff via Asymptotic Analysis of Large MIMO Systems
Diversity-multiplexing tradeoff outage probability
2010/12/9
Diversity–multiplexing tradeoff (DMT) was characterized asymptotically (SNR-> infinity) for i.i.d. Rayleigh fading channel by Zheng and Tse [1].