Results 71 to 80 of about 17,103 (274)

An airborne radar sea clutter spectrum parameters estimation method based on intelligent learning

Xibei Gongye Daxue Xuebao
Traditional airborne radar sea clutter suppression methods have a high degree of human participation and large errors in estimating the clutter power spectrum.
FAN Yifei, WANG Xinbao, SU Jia, TAO Mingliang, CHEN Ming, WANG Ling   +5 more
doaj   +1 more source

Spatial-temporal correlated sea clutter simulation based on the probability definition with extended samples for airborne radar

The Journal of Engineering, 2019
Sea clutter is often examined to be of spatial-temporal correlation which highly affects the detection performance on ship targets for airborne early warning radar.
Mao Huihuang, Xie Wenchong, Zhao Xinggang, Xia Saiqiang   +3 more
doaj   +1 more source

Holographic Fermi and Non-Fermi Liquids with Transitions in Dilaton Gravity [PDF]

, 2011
We study the two-point function for fermionic operators in a class of strongly coupled systems using the gauge-gravity correspondence. The gravity description includes a gauge field and a dilaton which determines the gauge coupling and the potential ...
A Dabholkar, A Donos, A Donos, A Sen, AB Migdal, B Gouteraux, C Charmousis, C-M Chen, CP Herzog, E Witten, GT Horowitz, GW Gibbons, H Liu, JM Maldacena, JP Gauntlett, K Balasubramanian, K Goldstein, K Goldstein, K Goldstein, L Huijse, M Cubrovic, M Edalati, M Kulaxizi, MA Vasiliev, Nilay Kundu, Norihiro Iizuka, P Koroteev, Prithvi Narayan, R Kallosh, R Meyer, S Bellucci, S Ferrara, S Ferrara, S Gubser, S Jain, S Jain, S Kachru, S Kachru, S Kachru, S Kachru, S Sachdev, S-S Lee, SA Hartnoll, SA Hartnoll, Sandip P. Trivedi, SK Chakrabarti, SS Gubser, SS Gubser, T Faulkner, T Faulkner, T Senthil, X Arsiwalla   +51 more
core   +2 more sources

Bridging Theory and Prediction: A Hybrid SEM and Machine Learning Approach to Optimize Lean Construction for Megaproject Sustainability in China

Corporate Social Responsibility and Environmental Management, EarlyView.
ABSTRACT Construction megaprojects, large‐scale, complex, and capital‐intensive, are particularly prone to inefficiencies, cost overruns, delays, and environmental degradation due to fragmented workflows, stakeholder misalignment, and resource intensity.
Abdelazim Ibrahim, Tarek Zayed, Zoubeir Lafhaj, Ahmed Maged, Ahmed Farouk Kineber, Jingchao Yang   +5 more
wiley   +1 more source

Ocean waves and turbulence as observed with an adaptive coherent multifrequency radar [PDF]

, 1984
An adaptive coherent multifrequency radar system is developed for several applications. The velocity distribution (Doppler spectrum) and spectral intensity of 15 different irregularity scales (waves and turbulence) can be measured simultaneously ...
Gjessing, D. T., Hjelmstad, J.
core   +1 more source

Examining early inhibitory control and emotion regulation as predictors of childhood internalizing and externalizing problems: A longitudinal study

JCPP Advances, EarlyView.
In a longitudinal sample (n = 94), we tested links between inhibitory control at age 4, emotion regulation (ER) at age 6, and internalizing (INT) and externalizing (EXT) problems at ages 9–10. Early inhibitory control did not predict ER or later INT/EXT (no mediation), whereas ER at 6 showed prospective associations with both outcomes.
Lilja K. Jónsdóttir, Matilda A. Frick, Andreas Frick, Emma J. Heeman, Karin C. Brocki   +4 more
wiley   +1 more source

Method for weak target detection in sea environment

The Journal of Engineering, 2019
In this study, a new method for sea surface target detection in low signal-to-clutter environment is proposed, which can not only reduce the computation amount but also suppress the sea clutter, static targets and noise.
Chang Gao, Ran Tao, Xuejing Kang
doaj   +1 more source

Impact of Gravity on Vacuum Stability

, 2016
In a pioneering paper on the role of gravity on false vacuum decay, Coleman and De Luccia showed that a strong gravitational field can stabilize the false vacuum, suppressing the formation of true vacuum bubbles. This result is obtained for the case when
Branchina, Vincenzo, Messina, Emanuele, Zappala, Dario   +2 more
core   +1 more source

Seasonal Variability of Precipitating Systems in Four Radar Domains of Northeast Brazil

International Journal of Climatology, EarlyView.
This study analyzes the climatology and evaluates how the physical aspects of precipitating systems are influenced by the dry and wet seasons in Northeast Brazil, highlighting seasonal variations in the frequency, size, intensity, and duration of these systems in the regions of Natal, Maceió, Petrolina, and Salvador.
Amanda Carolina da Silva Queiroz, Thiago Souza Biscaro   +1 more
wiley   +1 more source

Amplitude Suppression of Nongaussian Sea Clutter in a Coherent Bandpass Path of the Receiver

Известия высших учебных заведений России: Радиоэлектроника, 2016
The method of non-linear amplitude suppression of radar clutter from a sea surface in the coherent band path of the receiver is considered. The model of the most adequate nongaussian radar clutter from the rough sea surface which envelope is based on K ...
E. A. Milashchenko, A. A. Yazovsky
doaj