Nikolai Zh Kolev

Assembly, testing, and installation of mPMT photosensor for the Water Cherenkov Test Experiment

M. Gola, M. Barbi, V. Berardi, A. Buchowicz et autres

ca, it, pl, mx, in (code pays fourni par la source)

K Band Radar Drone Signatures

Nikolai Zh Kolev, Ekaterinoslav Sirakov

bg (code pays fourni par la source)

Investigation of Underwater Packet Radio Communication at 433 MHz

Nikolai Zh Kolev, Darin Peev, Neli Stoycheva

An investigation of underwater packet radio communication at 433 megahertz is carried out. A finite element method model is developed for simulation of antenna radiation in an ununiform lossy media and electromagnetic wave power levels are calculated in fresh and seawater. An …

bg (code pays fourni par la source)

Stratified Layer Composite Material for Radar Anti-reflective Coating

Darin Peev, Nikolai Zh Kolev, Yordan Sivkov

A composite material design that minimizes the radar reflection in S and X bands for at least two different ma-terials to be cloaked is proposed. The designed layered anti- reflective coating has tunable parameters, tailored depending on dielectric properties of the body …

bg (code pays fourni par la source)

An approach for modeling the attenuation of UHF oscillations in a class of composite materials

Nikolay L. Gueorguiev, Nikolai Zh Kolev, Atanas D. Nachev

The use of composite materials in the aerospace industry necessitates their design in a way that makes them suitable for non-destructive testing, including ultra-high frequency diagnostic methods using emission in the range of several megahertz to several gigahertzes. Basic parameter determining the …

bg (code pays fourni par la source)

Determination of attenuations of ultra-high-frequency oscillations in a class of composite materials by a waveguide measuring line

Nikolay L. Gueorguiev, Nikolai Zh Kolev, Atanas D. Nachev

The growing use of composite materials in the aerospace industry necessitates the analysis of the possibilities for their diagnostics and for the non-destructive control of their quality, taking into account their specific features. One of the new methods for non-destructive diagnostics of …

bg (code pays fourni par la source)

Oil Spills Detection on Sea Surface by using Sentinel–1 SAR Images

Chavdar Alexandrov, Nikolai Zh Kolev, Yordan Sivkov, Avgustin Hristov et autres

The present paper describes an algorithm and software application for oil slicks detection on the sea surface by using Sentinel - 1 SAR images. Some experimental results demonstrate application's ability to process SAR images and to detect oil slicks on the sea …

bg (code pays fourni par la source)

AIS Assisted Sentinel-1 SLC Image Ship Detection, Motion and Displacement Estimation

Nikolai Zh Kolev, Avgustin Hristov, Miroslav Y. Tsvetkov, Chavdar Alexandrov

In the paper an algorithm for complex synthetic aperture radar (SAR) ship images, automatic identification system (AIS) assisted detection and motion estimation is proposed. Displacement of the moving target on the SAR image is calculated by formula and compared with that measured …

bg (code pays fourni par la source)

Proposal for A Water Cherenkov Test Beam Experiment for Hyper-Kamiokande andFuture Large-scale Water-based Detectors

M. Barbi, S. Bhadra, Satish Suresh Chinchanikar, L. Ludovici et autres

Here we propose a 50 ton scale Water Cherenkov test experiment (WCTE) to be deployed in an East Area test beam line. The experiment will include a secondary target located just upstream of the experiment in order to produce very low energy …

ОБРАБОТКА НА SAR ИЗОБРАЖЕНИЯ ЗА ОТКРИВАНЕ НА КОРАБИ ПО КИЛВАТЕРНАТА СЛЕДА

Чавдар Александров, Nikolai Zh Kolev, Мирослав Цветков, Йордан Сивков

SAR IMAGE PROCESSING FOR SHIP WAKE DETECTION

Chavdar Alexandrov, Nikolai Zh Kolev, Miroslav Y. Tsvetkov, Yordan Sivkov

A Water Cherenkov Test Beam Experiment for Hyper-Kamiokande and Future Large-scale Water-based Detectors

M. Barbi, S. Bhadra, L. Ludovici, Mark A. Scott et autres

Water Cherenkov and water-based particle detector technologies are used to realize multi-kiloton scale experiments such as the currently operating Super-Kamiokande experiment, the planned Hyper-Kamiokande experiment and the proposed THEIA detector and ESSnuSB detectors. These experiments are operated or proposed to study a …