Геоморфологические методы поисков россыпей драгоценных камней на острове Шри Ланка

Morphometric methods of evaluation of relief and river valleys in first place have been used to evaluate the territory of Shri Lanka with the search for deposits in view.В работе на основе применения приемов геоморфологического анализа рельефа о. Шри-Ланка сделан прогноз и выявлены места возможных концентраций россыпей драгоценных камней

Минералогические и петрофизические исследования пирокластического материала вулкана Эйяфьятлайокюдль (о. Исландия)

Take a mineralogical and petrophysical research of pyroclastic rock of volcano Eyjafjallajökull. Test a mineral composition and petrophysical properties of pyroclastic rock.Проведены минералогические и петрофизические исследования пепла вулкана Эйяфьятлайокюдль. Определен минеральный состав пепла и его петрофизические свойства

Рельеф острова Шри-Ланка (юго-западная часть) и россыпи

On the explored territory 5 genetic types of the relief are distinguished as well as related to them gem sands. These gem sands had been formed in the Kalu-Ganga river valley within the junction zone of the low accumulative plain-depression and low hill and low mountain ridge relief made up by the productive Proterozoic thick layers.Выделены основные генетические типы рельефа о. Шри-Ланка, указаны места возможных концентрации россыпей драгоценных камней

Петрохимические и петрофизические особенности карбонатных пород Хвойнинского месторождения известняков

Questions of research and mapping of carbonaceous deposits, based on petrophysical, petrochemical and geological methods, are discussed.Рост объемов жилищного строительства, ремонт имеющихся зданий и сооружений и пр. требует расширения производства цемента и других строительных материалов на основе поисков, разведки и вовлечения в эксплуатацию новых месторождений карбонатного сырья

О геологическом феномене - выпадении "каменной тучи" у Великого Устюга

In Velikij Ustug region stones with some specific features are known. According to ancient legends and chronicles these stones presumably are of meteoritic origin. The detailed mineralogo-petrographical, petrophysical and mineragraphycal analyses of one of such stones showed, that most probably it has Earth origin.Приведены данные по особенностям геоморфологии района выпадения «каменной тучи» предположительно метеоритного происхождения (1290 г.). На основе минералого-петрографического, петрофизического, минераграфического анализов камня, взятого с места выпадения «каменной тучи», определена его земная природа

Measurement of the azimuthal anisotropy of Y(1S) and Y(2S) mesons in PbPb collisions at √S^{S}NN = 5.02 TeV

The second-order Fourier coefficients (υ$_{2}$) characterizing the azimuthal distributions of Υ(1S) and Υ(2S) mesons produced in PbPb collisions at $\sqrt{s_{NN}}$ = 5.02 TeV are studied. The Υmesons are reconstructed in their dimuon decay channel, as measured by the CMS detector. The collected data set corresponds to an integrated luminosity of 1.7 nb$^{-1}$. The scalar product method is used to extract the υ$_{2}$ coefficients of the azimuthal distributions. Results are reported for the rapidity range |y| < 2.4, in the transverse momentum interval 0 < p$_{T}$ < 50 GeV/c, and in three centrality ranges of 10–30%, 30–50% and 50–90%. In contrast to the J/ψ mesons, the measured υ$_{2}$ values for the Υ mesons are found to be consistent with zero

Measurement of prompt D0^{0} and D‾\overline{D}0^{0} meson azimuthal anisotropy and search for strong electric fields in PbPb collisions at root SNN\sqrt{S_{NN}} = 5.02 TeV

The strong Coulomb field created in ultrarelativistic heavy ion collisions is expected to produce a rapiditydependent difference (Av2) in the second Fourier coefficient of the azimuthal distribution (elliptic flow, v2) between D0 (uc) and D0 (uc) mesons. Motivated by the search for evidence of this field, the CMS detector at the LHC is used to perform the first measurement of Av2. The rapidity-averaged value is found to be (Av2) = 0.001 ? 0.001 (stat)? 0.003 (syst) in PbPb collisions at ?sNN = 5.02 TeV. In addition, the influence of the collision geometry is explored by measuring the D0 and D0mesons v2 and triangular flow coefficient (v3) as functions of rapidity, transverse momentum (pT), and event centrality (a measure of the overlap of the two Pb nuclei). A clear centrality dependence of prompt D0 meson v2 values is observed, while the v3 is largely independent of centrality. These trends are consistent with expectations of flow driven by the initial-state geometry. ? 2021 The Author. Published by Elsevier B.V. This is an open access article under the CC BY licens

Performance of reconstruction and identification of τ leptons decaying to hadrons and vτ in pp collisions at √s=13 TeV

The algorithm developed by the CMS Collaboration to reconstruct and identify τ leptons produced in proton-proton collisions at √s=7 and 8 TeV, via their decays to hadrons and a neutrino, has been significantly improved. The changes include a revised reconstruction of π⁰ candidates, and improvements in multivariate discriminants to separate τ leptons from jets and electrons. The algorithm is extended to reconstruct τ leptons in highly Lorentz-boosted pair production, and in the high-level trigger. The performance of the algorithm is studied using proton-proton collisions recorded during 2016 at √s=13 TeV, corresponding to an integrated luminosity of 35.9 fb¯¹. The performance is evaluated in terms of the efficiency for a genuine τ lepton to pass the identification criteria and of the probabilities for jets, electrons, and muons to be misidentified as τ leptons. The results are found to be very close to those expected from Monte Carlo simulation

Performance of the CMS Level-1 trigger in proton-proton collisions at √s = 13 TeV

At the start of Run 2 in 2015, the LHC delivered proton-proton collisions at a center-of-mass energy of 13\TeV. During Run 2 (years 2015–2018) the LHC eventually reached a luminosity of 2.1× 10$^{34}$ cm$^{-2}$s$^{-1}$, almost three times that reached during Run 1 (2009–2013) and a factor of two larger than the LHC design value, leading to events with up to a mean of about 50 simultaneous inelastic proton-proton collisions per bunch crossing (pileup). The CMS Level-1 trigger was upgraded prior to 2016 to improve the selection of physics events in the challenging conditions posed by the second run of the LHC. This paper describes the performance of the CMS Level-1 trigger upgrade during the data taking period of 2016–2018. The upgraded trigger implements pattern recognition and boosted decision tree regression techniques for muon reconstruction, includes pileup subtraction for jets and energy sums, and incorporates pileup-dependent isolation requirements for electrons and tau leptons. In addition, the new trigger calculates high-level quantities such as the invariant mass of pairs of reconstructed particles. The upgrade reduces the trigger rate from background processes and improves the trigger efficiency for a wide variety of physics signals