Research on websites optimisation methods for local business owners

Проведені дослідження методів пошукової оптимізації для веб-сайтів підприємців. Виконано оцінки впливу пошукової оптимізації на підвищення позицій сайту в пошуковій видачі та отриманні більшої кількості потенційних клієнтівПроведены исследования методов поисковой оптимизации для веб-сайтов предпринимателей. Выполнены оценки влияния поисковой оптимизации на повышение позиций сайта в поисковой выдаче и получение большего количества потенциальных клиентов.Conducted a research of methods of search engine optimization for websites entrepreneurs. Its impact on improving the position of a website in the search results and getting more potential customers is provided

ВНЕДРЕНИЕ БЕСПРОВОДНОЙ ГЕТЕРОГЕННОЙ СЕТИ ДЛЯ ВОЕННОГО ПРИМЕНЕНИЯ НА ОСНОВЕ ВИРТУАЛИЗАЦИИ ЯДРА LTE

Telecommunication systems have always been the cornerstone of military forces. Modern systems like LTE provide high speed channels in pair with high mobility. Intelligent devices with advanced capabilities of information processing require from communication system to be able to transfer high speed flows of data between any two mobile terminals or stationary base. In this paper the concept of wireless heterogeneous network is proposed for utilization by military units. This concept implies use of network function virtualization for creating mobile core of LTE system that is paired with base station. For extension of the coverage area, the concept of mesh network that is based on self-organizing architecture of quad copters is proposed. The mathematical model of functioning of mesh network is proposed.У цій роботі запропоновано концепцію безпровідної гетерогенної мережі військового призначення. Ця концепція передбачає використання технології віртуалізації мережевих функцій для створення мобільного ядра системи LTE, яке може бути конструктивно поєднане з базовою станцією в одному мобільному модулі з високим рівнем захисту від відмов та уражень. Для розширення зони покриття запропонована концепція використовує безпілотні літаючі пристрої, які оснащені модулем передачі. Ці пристрої можуть самоорганізовуватися у безпровідну мережу та виступати у ролі проміжних вузлів при передачі інформації з кінця у кінець. У цій роботі також представлена математична модель функціонування та самоорганізації такої мережі.В этой работе предложена концепция беспроводной гетерогенной сети военного назначения. Эта концепция предусматривает использование технологии виртуализации сетевых функций для создания мобильного ядра системы LTE, которое может быть конструктивно сопряжено с базовой станцией в одном мобильном модуле с высоким уровнем защиты от отказов и поражений. Для расширения зоны покрытия предложенная концепция использует беспилотные летающие устройств, оснащенные модулем передачи. Эти устройства могут самоорганизовываться в беспроводную сеть и выступать в роли промежуточных узлов при передачи информации с конца в конец. В этой работе также представлена математическая модель функционирования и самоорганизации такой сети

Monte Carlo studies for the optimisation of the Cherenkov Telescope Array layout

International audienceThe Cherenkov Telescope Array (CTA) is the major next-generation observatory for ground-based very-high-energy gamma-ray astronomy. It will improve the sensitivity of current ground-based instruments by a factor of five to twenty, depending on the energy, greatly improving both their angular and energy resolutions over four decades in energy (from 20 GeV to 300 TeV). This achievement will be possible by using tens of imaging Cherenkov telescopes of three successive sizes. They will be arranged into two arrays, one per hemisphere, located on the La Palma island (Spain) and in Paranal (Chile). We present here the optimised and final telescope arrays for both CTA sites, as well as their foreseen performance, resulting from the analysis of three different large-scale Monte Carlo productions

Sensitivity of the Cherenkov Telescope Array for probing cosmology and fundamental physics with gamma-ray propagation

The Cherenkov Telescope Array (CTA), the new-generation ground-based observatory for γ astronomy, provides unique capabilities to address significant open questions in astrophysics, cosmology, and fundamental physics. We study some of the salient areas of γ cosmology that can be explored as part of the Key Science Projects of CTA, through simulated observations of active galactic nuclei (AGN) and of their relativistic jets. Observations of AGN with CTA will enable a measurement of γ absorption on the extragalactic background light with a statistical uncertainty below 15% up to a redshift z=2 and to constrain or detect γ halos up to intergalactic-magnetic-field strengths of at least 0.3 pG . Extragalactic observations with CTA also show promising potential to probe physics beyond the Standard Model. The best limits on Lorentz invariance violation from γ astronomy will be improved by a factor of at least two to three. CTA will also probe the parameter space in which axion-like particles could constitute a significant fraction, if not all, of dark matter. We conclude on the synergies between CTA and other upcoming facilities that will foster the growth of γ cosmology

Prospects for γ\gamma-ray observations of the Perseus galaxy cluster with the Cherenkov Telescope Array

International audienceGalaxy clusters are expected to be dark matter (DM) reservoirs and storage rooms for the cosmic-ray protons (CRp) that accumulate along the cluster's formation history. Accordingly, they are excellent targets to search for signals of DM annihilation and decay at gamma-ray energies and are predicted to be sources of large-scale gamma-ray emission due to hadronic interactions in the intracluster medium. We estimate the sensitivity of the Cherenkov Telescope Array (CTA) to detect diffuse gamma-ray emission from the Perseus galaxy cluster. We perform a detailed spatial and spectral modelling of the expected signal for the DM and the CRp components. For each, we compute the expected CTA sensitivity. The observing strategy of Perseus is also discussed. In the absence of a diffuse signal (non-detection), CTA should constrain the CRp to thermal energy ratio within the radius $R_{500}$ down to about $X_{500}10^{27}$s for DM masses above 1 TeV. These constraints will provide unprecedented sensitivity to the physics of both CRp acceleration and transport at cluster scale and to TeV DM particle models, especially in the decay scenario

Galactic transient sources with the Cherenkov Telescope Array

International audienceA wide variety of Galactic sources show transient emission at soft and hard X-ray energies: low-mass and high-mass X-ray binaries containing compact objects (e.g., novae, microquasars, transitional millisecond pulsars, supergiant fast X-ray transients), isolated neutron stars exhibiting extreme variability as magnetars as well as pulsar wind nebulae. Although most of them can show emission up to MeV and/or GeV energies, many have not yet been detected in the TeV domain by Imaging Atmospheric Cherenkov Telescopes. In this paper, we explore the feasibility of detecting new Galactic transients with the Cherenkov Telescope Array (CTA) and the prospects for studying them with Target of Opportunity observations. We show that CTA will likely detect new sources in the TeV regime, such as the massive microquasars in the Cygnus region, low-mass X-ray binaries with low-viewing angle, flaring emission from the Crab pulsar-wind nebula or other novae explosions, among others. We also discuss the multi-wavelength synergies with other instruments and large astronomical facilities

Prospects for γ\gamma-ray observations of the Perseus galaxy cluster with the Cherenkov Telescope Array

International audienceGalaxy clusters are expected to be dark matter (DM) reservoirs and storage rooms for the cosmic-ray protons (CRp) that accumulate along the cluster's formation history. Accordingly, they are excellent targets to search for signals of DM annihilation and decay at gamma-ray energies and are predicted to be sources of large-scale gamma-ray emission due to hadronic interactions in the intracluster medium. We estimate the sensitivity of the Cherenkov Telescope Array (CTA) to detect diffuse gamma-ray emission from the Perseus galaxy cluster. We perform a detailed spatial and spectral modelling of the expected signal for the DM and the CRp components. For each, we compute the expected CTA sensitivity. The observing strategy of Perseus is also discussed. In the absence of a diffuse signal (non-detection), CTA should constrain the CRp to thermal energy ratio within the radius $R_{500}$ down to about $X_{500}10^{27}$s for DM masses above 1 TeV. These constraints will provide unprecedented sensitivity to the physics of both CRp acceleration and transport at cluster scale and to TeV DM particle models, especially in the decay scenario

Galactic transient sources with the Cherenkov Telescope Array

International audienceA wide variety of Galactic sources show transient emission at soft and hard X-ray energies: low-mass and high-mass X-ray binaries containing compact objects (e.g., novae, microquasars, transitional millisecond pulsars, supergiant fast X-ray transients), isolated neutron stars exhibiting extreme variability as magnetars as well as pulsar wind nebulae. Although most of them can show emission up to MeV and/or GeV energies, many have not yet been detected in the TeV domain by Imaging Atmospheric Cherenkov Telescopes. In this paper, we explore the feasibility of detecting new Galactic transients with the Cherenkov Telescope Array (CTA) and the prospects for studying them with Target of Opportunity observations. We show that CTA will likely detect new sources in the TeV regime, such as the massive microquasars in the Cygnus region, low-mass X-ray binaries with low-viewing angle, flaring emission from the Crab pulsar-wind nebula or other novae explosions, among others. We also discuss the multi-wavelength synergies with other instruments and large astronomical facilities

Prospects for γ\gamma-ray observations of the Perseus galaxy cluster with the Cherenkov Telescope Array

International audienceGalaxy clusters are expected to be dark matter (DM) reservoirs and storage rooms for the cosmic-ray protons (CRp) that accumulate along the cluster's formation history. Accordingly, they are excellent targets to search for signals of DM annihilation and decay at gamma-ray energies and are predicted to be sources of large-scale gamma-ray emission due to hadronic interactions in the intracluster medium. We estimate the sensitivity of the Cherenkov Telescope Array (CTA) to detect diffuse gamma-ray emission from the Perseus galaxy cluster. We perform a detailed spatial and spectral modelling of the expected signal for the DM and the CRp components. For each, we compute the expected CTA sensitivity. The observing strategy of Perseus is also discussed. In the absence of a diffuse signal (non-detection), CTA should constrain the CRp to thermal energy ratio within the radius $R_{500}$ down to about $X_{500}10^{27}$s for DM masses above 1 TeV. These constraints will provide unprecedented sensitivity to the physics of both CRp acceleration and transport at cluster scale and to TeV DM particle models, especially in the decay scenario

Galactic transient sources with the Cherenkov Telescope Array

International audienceA wide variety of Galactic sources show transient emission at soft and hard X-ray energies: low-mass and high-mass X-ray binaries containing compact objects (e.g., novae, microquasars, transitional millisecond pulsars, supergiant fast X-ray transients), isolated neutron stars exhibiting extreme variability as magnetars as well as pulsar wind nebulae. Although most of them can show emission up to MeV and/or GeV energies, many have not yet been detected in the TeV domain by Imaging Atmospheric Cherenkov Telescopes. In this paper, we explore the feasibility of detecting new Galactic transients with the Cherenkov Telescope Array (CTA) and the prospects for studying them with Target of Opportunity observations. We show that CTA will likely detect new sources in the TeV regime, such as the massive microquasars in the Cygnus region, low-mass X-ray binaries with low-viewing angle, flaring emission from the Crab pulsar-wind nebula or other novae explosions, among others. We also discuss the multi-wavelength synergies with other instruments and large astronomical facilities