Сучасний стан та структура ценопопуляцій видів роду Fritillaria L. у деяких місцезнаходженнях Полтавської області

The results of the investigation of chorology, ecological and coenotic features, a state of populations of species of Fritillaria L. genus in terrain of the Poltava Region are presented. The recommendations on preservation of a genus are given.Наведено результати досліджень хорології, еколого-ценотичних особливостей, стану популяцій видів роду Fritillaria L. на території Полтавської області. Дано рекомендації щодо охорони роду

Еколого-ценотичні особливості рідкісних видів спонтанної флори Національного дендрологічного парку “Софіївка” НАН України

An ecological and coenotic evaluation of four rare species of spontaneous flora of the National dendrological park Sofievka of the NAS of Ukraine – Tulipa quercetorum Klokov et Zoz, Allium ursinum L., Euonymus nana M. Bieb., Scopolia carniolica Jacq were carried out. It was determined the affiliation of the communities with the participation of studied species to the corydaletosum cavae subassociation of the Isopyro thalictroidis-Carpinetum Onyshchenko 1998 association. According to the results phytoindicative assessment it was revealed that communities with rare species are on the border or outside the borders of the eco logical amplitude of the association. The major factors of ecological differentiation of the communities were determined. The measures for effective protection of the studied species in conditions of the park were proposed.Проведено еколого-ценотичну оцінку чотирьох рідкісних представників спонтанної флори Національного дендрологічного парку “Софіївка” НАН України – Tulipa quercetorum Klokov et Zoz, Allium ursinum L., Euonymus nana M. Bieb., Scopolia carniolica Jacq. Установлено належність угруповань з їх участю до субасоціації Corydaletosum cavae асоціації Isopyro thalictroidis-Carpinetum Onyshchenko 1998. За результатами фітоіндикаційної оцінки виявлено, що угруповання за участю рідкісних видів перебувають на межі або за межею екологічної амплітуди асоціації. Виділено провідні чинники екологічної диференціації угруповань. Запропоновано заходи з ефективної охорони досліджених видів в умовах дендропарку

Photosensitive AlGaAs / GaAs Structures Grown by Molecular Beam Epitaxy

AlGaAs / GaAs photosensitive structures were grown by molecular beam epitaxy and photodetector de-vices were fabricated. The structures were characterized by reflection high-energy electron diffraction (RHEED), reflectance anisotropy spectroscopy (RAS) and atomic force microscopy (AFM). Spectral charac-teristics of p-i-n structures were calculated. It is shown that obtained structures have atomically smooth surface and abrupt heterointerfaces. Room-temperature I-V measurements of fabricated photodetectors showed low dark current Id=3.38 nA at reverse bias Urev=5 V. When you are citing the document, use the following link http://essuir.sumdu.edu.ua/handle/123456789/3613

Ecological and coenotic peculiarities of the rare species of spontaneous flora of the National Dendrological Park Sofiyivka of the NAS of Ukraine

An ecological and coenotic evaluation of four rare species of spontaneous flora of the National dendrological park Sofievka of the NAS of Ukraine — Tulipa quercetorum Klokov & Zoz, Allium ursinum L., Euonymus nana M. Bieb., Scopolia carniolica Jacq were carried out. It was determined the affiliation of the communities with the participation of studied species to the corydaletosum cavae subassociation of the Isopyro thalictroidis-Carpinetum Onyshchenko 1998 association. According to the results phytoindicative assessment it was revealed that communities with rare species are on the border or outside the borders of the eco logical amplitude of the association. The major factors of ecological differentiation of the communities were determined. The measures for effective protection of the studied species in conditions of the park were proposed

Search for supersymmetry in final states with missing transverse momentum and three or more b-jets in 139 fb−1^{-1} of proton–proton collisions at s=13\sqrt{s} = 13 TeV with the ATLAS detector

International audienceA search for supersymmetry involving the pair production of gluinos decaying via off-shell third-generation squarks into the lightest neutralino $(\tilde{\chi }^0_1)$ is reported. It exploits LHC proton–proton collision data at a centre-of-mass energy $\sqrt{s} = 13$ TeV with an integrated luminosity of 139 fb$^{-1}$ collected with the ATLAS detector from 2015 to 2018. The search uses events containing large missing transverse momentum, up to one electron or muon, and several energetic jets, at least three of which must be identified as containing b-hadrons. Both a simple kinematic event selection and an event selection based upon a deep neural-network are used. No significant excess above the predicted background is found. In simplified models involving the pair production of gluinos that decay via off-shell top (bottom) squarks, gluino masses less than 2.44 TeV (2.35 TeV) are excluded at 95% CL for a massless $\tilde{\chi }^0_1.$ Limits are also set on the gluino mass in models with variable branching ratios for gluino decays to $b\bar{b}\tilde{\chi }^0_1,t\bar{t}\tilde{\chi }^0_1$ and $t\bar{b}\tilde{\chi }^-_1/\bar{t}b\tilde{\chi }^+_1.

Search for pair production of third-generation leptoquarks decaying into a bottom quark and a τ\tau -lepton with the ATLAS detector

International audienceA search for pair-produced scalar or vector leptoquarks decaying into a b-quark and a $\tau$-lepton is presented using the full LHC Run 2 (2015–2018) data sample of 139 fb$^{-1}$ collected with the ATLAS detector in proton–proton collisions at a centre-of-mass energy of $\sqrt{s} =13$ TeV. Events in which at least one $\tau$-lepton decays hadronically are considered, and multivariate discriminants are used to extract the signals. No significant deviations from the Standard Model expectation are observed and 95% confidence-level upper limits on the production cross-section are derived as a function of leptoquark mass and branching ratio $\mathcal {B}$ into a $\tau$-lepton and b-quark. For scalar leptoquarks, masses below 1460 GeV are excluded assuming $\mathcal {B}=100$%, while for vector leptoquarks the corresponding limit is 1650 GeV (1910 GeV) in the minimal-coupling (Yang–Mills) scenario

Search for new phenomena in final states with photons, jets and missing transverse momentum in pp collisions at s \sqrt{s} = 13 TeV with the ATLAS detector

International audienceA search for new phenomena has been performed in final states with at least one isolated high-momentum photon, jets and missing transverse momentum in proton–proton collisions at a centre-of-mass energy of $\sqrt{s}$ = 13 TeV. The data, collected by the ATLAS experiment at the CERN LHC, correspond to an integrated luminosity of 139 fb$^{−1}$. The experimental results are interpreted in a supersymmetric model in which pair-produced gluinos decay into neutralinos, which in turn decay into a gravitino, at least one photon, and jets. No significant deviations from the predictions of the Standard Model are observed. Upper limits are set on the visible cross section due to physics beyond the Standard Model, and lower limits are set on the masses of the gluinos and neutralinos, all at 95% confidence level. Visible cross sections greater than 0.022 fb are excluded and pair-produced gluinos with masses up to 2200 GeV are excluded for most of the NLSP masses investigated.[graphic not available: see fulltext

Search for resonant and non-resonant Higgs boson pair production in the bb‾τ+τ− b\overline{b}{\tau}^{+}{\tau}^{-} decay channel using 13 TeV pp collision data from the ATLAS detector

International audienceA search for Higgs boson pair production in events with two b-jets and two τ-leptons is presented, using a proton–proton collision dataset with an integrated luminosity of 139 fb$^{−1}$ collected at $\sqrt{s}$ = 13 TeV by the ATLAS experiment at the LHC. Higgs boson pairs produced non-resonantly or in the decay of a narrow scalar resonance in the mass range from 251 to 1600 GeV are targeted. Events in which at least one τ-lepton decays hadronically are considered, and multivariate discriminants are used to reject the backgrounds. No significant excess of events above the expected background is observed in the non-resonant search. The largest excess in the resonant search is observed at a resonance mass of 1 TeV, with a local (global) significance of 3.1σ (2.0σ). Observed (expected) 95% confidence-level upper limits are set on the non-resonant Higgs boson pair-production cross-section at 4.7 (3.9) times the Standard Model prediction, assuming Standard Model kinematics, and on the resonant Higgs boson pair-production cross-section at between 21 and 900 fb (12 and 840 fb), depending on the mass of the narrow scalar resonance.[graphic not available: see fulltext

Luminosity determination in pppp collisions at s=13\sqrt{s}=13 TeV using the ATLAS detector at the LHC

The luminosity determination for the ATLAS detector at the LHC during Run 2 is presented, with $pp$ collisions at $\sqrt{s}=13$ TeV. The absolute luminosity scale is determined using van der Meer beam separation scans during dedicated running periods in each year, and extrapolated to the physics data-taking regime using complementary measurements from several luminosity-sensitive detectors. The total uncertainties in the integrated luminosities for each individual year of data-taking range from 0.9% to 1.1%, and are partially correlated between years. After standard data-quality selections, the full Run 2 $pp$ data sample corresponds to an integrated luminosity of $140.1\pm 1.2$ fb$^{-1}$, i.e. an uncertainty of 0.83%. A dedicated sample of low-pileup data recorded in 2017-18 for precision Standard Model physics measurements is analysed separately, and has an integrated luminosity of $338.1\pm 3.1$ pb$^{-1}$.The luminosity determination for the ATLAS detector at the LHC during Run 2 is presented, with pp collisions at a centre-of-mass energy $\sqrt{s}=13$ TeV. The absolute luminosity scale is determined using van der Meer beam separation scans during dedicated running periods in each year, and extrapolated to the physics data-taking regime using complementary measurements from several luminosity-sensitive detectors. The total uncertainties in the integrated luminosity for each individual year of data-taking range from 0.9% to 1.1%, and are partially correlated between years. After standard data-quality selections, the full Run 2 pp data sample corresponds to an integrated luminosity of $140.1\pm 1.2$ $\hbox {fb}^{-1}$, i.e. an uncertainty of 0.83%. A dedicated sample of low-pileup data recorded in 2017–2018 for precision Standard Model physics measurements is analysed separately, and has an integrated luminosity of $338.1\pm 3.1$ $\hbox {pb}^{-1}$.The luminosity determination for the ATLAS detector at the LHC during Run 2 is presented, with $pp$ collisions at $\sqrt{s}=13$ TeV. The absolute luminosity scale is determined using van der Meer beam separation scans during dedicated running periods in each year, and extrapolated to the physics data-taking regime using complementary measurements from several luminosity-sensitive detectors. The total uncertainties in the integrated luminosities for each individual year of data-taking range from 0.9% to 1.1%, and are partially correlated between years. After standard data-quality selections, the full Run 2 $pp$ data sample corresponds to an integrated luminosity of $140.1\pm 1.2$ fb$^{-1}$, i.e. an uncertainty of 0.83%. A dedicated sample of low-pileup data recorded in 2017-18 for precision Standard Model physics measurements is analysed separately, and has an integrated luminosity of $338.1\pm 3.1$ pb$^{-1}$