64 research outputs found
Applying the Means of Respiratory Hypoxic-Hypercapnic Load In Training of Skilled Ski Racers
No full textМалеев Дмитрий Олегович, доцент кафедры лыжного спорта, Институт физической культуры Тюменского государственного университета, г. Тюмень, [email protected]. D.O. Maleev, [email protected]
Tyumen State University, Tyumen, Russian FederationЦель. Изучение возможности использования дыхательного тренажера «Карбоник»
в качестве средства респираторной гипоксической-гиперкапнической нагрузки в подготовке лыжников-гонщиков высокой квалификации. Организация и методы исследования. Под наблюдением находились две группы лыжников-гонщиков высокой квалификации (МС и КМС). В качестве основного средства тренирующего гипоксического воздействия использовались интервальная гипоксическая тренировка (ИГТ) и
гипоксическая палатка. В тренировочном процессе лыжников-гонщиков обеих групп
применялись одинаковые по величине нагрузки. Отличительная особенность программ
тренировки каждой из двух групп состояла в том, что в ходе проведения исследования
в тренировочном процессе спортсменов первой группы (экспериментальной) использовался дыхательный тренажер «Карбоник» профессора В.П. Куликова, в подготовке
второй группы (контрольной) он не применялся. Контроль за реакцией сердечно-
сосудистой и дыхательной систем организма испытуемых осуществлялся при помощи
диагностического комплекса Cardio Soft (США), компьютерной программы Firstbeat
sports с компактным записывающим устройством Firstbeat Bodyguard (Финляндия) и
пульсоксиметра фирмы «Ангио-Скан-01П» (Россия). Результаты. Установлено, что
применение дыхательного тренажера «Карбоник» в качестве эргогенического средства
гипоксической тренировки обеспечивает значительное повышение уровня устойчивости организма квалифицированных лыжников-гонщиков к гипоксии и ускорение восстановительных процессов после выполнения физических нагрузок. Заключение. В ходе
проведения исследования выявлено, что использование в подготовке лыжников-
гонщиков высокой квалификации гипоксической-гиперкапнической смеси приводят
к сочетанному положительному действию гипоксии и гиперкапнии на организм спортсменов. Aim. To study the feasibility of breathing simulator 'Carbonic' as a means of respiratory
hypoxic-hypercapnic load in training of skilled ski racers. Research organization and methods.
The subjects under observation were two groups of highly skilled ski-racers (Masters
and Candidate Masters of Sports). The main hypoxic training devices used were the interval
hypoxic training (IHT) and hypoxic tent. During exercising both groups of ski-racers had
an equal physical load, but a distinctive feature of the training programs for each of the two
groups was that the first (experimental) group used the breathing simulator ‘Carbonic’ by
Professor V.P. Kulikov, whereas the second (test) group did not. Cardiovascular and respiratory
control was carried out by means of the diagnostic system CardioSoft (USA), Firstbeat
Sports software with Firstbeat Bodyguard recording device (Finland), and AngioScan-01P
pulse oximeter (Russia). Results. It has been established that using breathing simulator
'Carbonic' as an ergogenic means of hypoxic training leads to significant increase of hypoxia
tolerance levels in skilled ski racers and to acceleration of recovery processes after physical
loads. Conclusion. The study has shown that using the hypoxic-hypercapnic mixture in training
of skilled ski racers results in a combined positive effect of hypoxia and hypercapnia on
the athlete’s body
Anomalous lasing of high-speed 850 nm InGaAlAs oxide-confined vertical-cavity surface-emitting lasers with a large negative gain-to-cavity wavelength detuning
No full textThis article may be downloaded for personal use only. Any other use requires prior permission of the author and AIP Publishing. This article appeared in Appl. Phys. Lett. 105, 061104 (2014) and may be found at https://doi.org/10.1063/1.4892885.The impact of a large negative quantum well gain-to-cavity etalon wavelength detuning on the static and dynamic characteristics of 850 nm InGaAlAs high-speed oxide-confined vertical-cavity surface-emitting lasers (VCSELs) was investigated. Three distinct lasing regimes were revealed in large square aperture (≥7 μm per side) devices with large detuning including: (1) an anomalous lasing via higher order Hermite–Gaussian modes at low forward bias current; (2) lasing via the lowest order Hermite–Gaussian modes at high bias current; and (3) simultaneous lasing via both types of transverse modes at intermediate bias currents. In contrast to conventional multimode VCSELs a two-resonance modulation response was observed for the case of co-lasing via multiple transverse modes with high spectral separation. The reduction in the oxide aperture area resulted in classical lasing via the lowest order modes with a conventional single-resonance frequency response.DFG, 43659573, SFB 787: Halbleiter - Nanophotonik: Materialien, Modelle, Bauelement
Measurement of the and production cross sections in multilepton final states using 3.2 fb of collisions at = 13 TeV with the ATLAS detector
No full textSee paper for full list of authors - 22 pages plus author list + cover page (40 pages total), 8 figures, 5 tables. Submitted to Eur. Phys. J. C. All figures including auxiliary figures are available at http://atlas.web.cern.ch/Atlas/GROUPS/PHYSICS/PAPERS/TOPQ-2015-22/International audienceA measurement of the and production cross sections in final states with either two same-charge muons, or three or four leptons (electrons or muons) is presented. The analysis uses a data sample of proton-proton collisions at TeV recorded with the ATLAS detector at the Large Hadron Collider in 2015, corresponding to a total integrated luminosity of 3.2 fb. The inclusive cross sections are extracted using likelihood fits to signal and control regions, resulting in pb and pb, in agreement with the Standard Model predictions
Measurement of the top quark mass in the t(t)over-bar -> dilepton channel from root s=8TeVATLAS data
No full textThe top quark mass is measured in the t (t) over bar -> dilepton channel (lepton= e, mu) using ATLAS data recorded in the year 2012 at the LHC. The data were taken at a proton-proton centre-of-mass energy of root s = 8 TeV and correspond to an integrated luminosity of about 20.2 fb(-1). Exploiting the template method, and using the distribution of invariant masses of lepton-b-jetpairs, the top quark mass is measured to be m(top) = 172.99 +/- 0.41(stat)+/- 0.74(syst) GeV, with a total uncertainty of 0.84 GeV. Finally, acombination with previous ATLAS m(top) measurements from root s = 7 TeV data in the t (t) over bar -> dilepton and t (t) over bar -> lepton + jets channels results in m(top) = 172.84 +/- 0.34(stat)+/- 0.61(syst) GeV, with a total uncertainty of 0.70 GeV. (C) 2016 The Author. Published by Elsevier B.V
Identification and energy calibration of hadronically decaying tau leptons with the ATLAS experiment in collisions at =8 TeV
No full textSee paper for full list of authors – 21 pages plus author list + cover pages (36 pages total), 18 figures, 6 tables, submitted to EPJC, All figures including auxiliary figures are available at http://atlas.web.cern.ch/Atlas/GROUPS/PHYSICS/PAPERS/PERF-2013-06International audienceThis paper describes the trigger and offline reconstruction, identification and energy calibration algorithms for hadronic decays of tau leptons employed for the data collected from collisions in 2012 with the ATLAS detector at the LHC center-of-mass energy TeV. The performance of these algorithms is measured in most cases with Z decays to tau leptons using the full 2012 dataset, corresponding to an integrated luminosity of 20.3 fb. An uncertainty on the offline reconstructed tau energy scale of 2% to 4%, depending on transverse energy and pseudorapidity, is achieved using two independent methods. The offline tau identification efficiency is measured with a precision of 2.5% for hadronically decaying tau leptons with one associated track, and of 4% for the case of three associated tracks, inclusive in pseudorapidity and for a visible transverse energy greater than GeV. For hadronic tau lepton decays selected by offline algorithms, the tau trigger identification efficiency is measured with a precision of 2% to 8%, depending on the transverse energy. The performance of the tau algorithms, both offline and at the trigger level, is found to be stable with respect to the number of concurrent proton--proton interactions and has supported a variety of physics results using hadronically decaying tau leptons at ATLAS
Measurements of the charge asymmetry in top-quark pair production in the dilepton final state at s√=8 TeV with the ATLAS detector
No full textSee paper for full list of authors - 27 pages plus author list + cover pages (45 pages total), 8 figures, 4 tables, submitted to Physical Review D, All figures including auxiliary figures are available at this http URLInternational audienceMeasurements of the top--antitop quark pair production charge asymmetry in the dilepton channel are presented using data corresponding to an integrated luminosity of 20.3 fb−1 from pp collisions at a center-of-mass energy of s√=8 TeV collected with the ATLAS detector at the Large Hadron Collider at CERN. Inclusive and differential measurements as a function of the invariant mass, transverse momentum, and longitudinal boost of the tt¯ system are performed both in the full phase space and in a fiducial phase space closely matching the detector acceptance. Two observables are studied: AℓℓC based on the selected leptons and Att¯C based on the reconstructed tt¯ final state. The inclusive asymmetries are measured in the full phase space to be AℓℓC=0.008±0.006 and Att¯C=0.021±0.016, which are in agreement with the Standard Model predictions of AℓℓC=0.0064±0.0003 and Att¯C=0.0111±0.0004
Determination of spin and parity of the Higgs boson in the decay channel with the ATLAS detector
No full textSee paper for full list of authors – 42 pages plus author list + cover pages (59 pages total), 19 figures, 9 tables, submitted to The European Physical Journal C, All figures are available at https://atlas.web.cern.ch/Atlas/GROUPS/PHYSICS/PAPERS/HIGG-2013-14/International audienceStudies of the spin and parity quantum numbers of the Higgs boson in the final state are presented, based on proton-proton collision data collected by the ATLAS detector at the Large Hadron Collider, corresponding to an integrated luminosity of 20.3 fb at a centre-of-mass energy of TeV. The Standard Model spin-parity hypothesis is compared with alternative hypotheses for both spin and CP. The case where the observed resonance is a mixture of the Standard-Model-like Higgs boson and CP-even () or CP-odd () Higgs boson in scenarios beyond the Standard Model is also studied. The data are found to be consistent with the Standard Model prediction and limits are placed on alternative spin and CP hypotheses, including CP mixing in different scenarios
Search for supersymmetry in events containing a same-flavour opposite-sign dilepton pair, jets, and large missing transverse momentum in TeV collisions with the ATLAS detector
No full textSee paper for full list of authors – 44 pages plus author list (61 pages total), 13 figures, 18 tables, submitted to Eur. Phys. J. C, all figures including auxiliary figures are available at http://atlas.web.cern.ch/Atlas/GROUPS/PHYSICS/PAPERS/SUSY-2014-10/International audienceTwo searches for supersymmetric particles in final states containing a same-flavour opposite-sign lepton pair, jets and large missing transverse momentum are presented. The proton-proton collision data used in these searches were collected at a centre-of-mass energy TeV by the ATLAS detector at the Large Hadron Collider and corresponds to an integrated luminosity of 20.3 fb. Two leptonic production mechanisms are considered: decays of squarks and gluinos with bosons in the final state, resulting in a peak in the dilepton invariant mass distribution around the -boson mass; and decays of neutralinos (e.g. ), resulting in a kinematic endpoint in the dilepton invariant mass distribution. For the former, an excess of events above the expected Standard Model background is observed, with a significance of 3 standard deviations. In the latter case, the data are well-described by the expected Standard Model background. The results from each channel are interpreted in the context of several supersymmetric models involving the production of squarks and gluinos
Search for Higgs boson pair production in the final state from collisions at TeV with the ATLAS detector
No full text32 pages plus author list + cover pages (49 pages total), 18 figures, 9 tables, submitted to EPJC. All figures including auxiliary figures are available at this http URL - See paper for full list of authorsInternational audienceA search for Higgs boson pair production is performed with 19.5 fb of proton--proton collision data at 8 TeV, which were recorded by the ATLAS detector at the Large Hadron Collider in 2012. The decay products of each Higgs boson are reconstructed as a high-momentum system with either a pair of small-radius jets or a single large-radius jet, the latter exploiting jet substructure techniques and associated -tagged track-jets. No evidence for resonant or non-resonant Higgs boson pair production is observed. The data are interpreted in the context of the Randall--Sundrum model with a warped extra dimension as well as the two-Higgs-doublet model. An upper limit on the cross-section for of 3.2 (2.3) fb is set for a Kaluza--Klein graviton mass of 1.0 (1.5) TeV, at the 95\% confidence level. The search for non-resonant Standard Model production sets an observed 95\% confidence level upper limit on the production cross-section of 202 fb, compared to a SM prediction of fb
Measurement of differential cross sections of isolated-photon plus heavy-flavour jet production in pp collisions at root s=8 TeV using the ATLAS detector
No full textThis Letter presents the measurement of differential cross sections of isolated prompt photons produced in association with a b-jet or a c-jet. These final states provide sensitivity to the heavy-flavour content of the proton and aspects related to the modelling of heavy-flavour quarks in perturbative QCD. The measurement uses proton-proton collision data at a centre-of-mass energy of 8 TeV recorded by the ATLAS detector at the LHC in 2012 corresponding to an integrated luminosity of up to 20.2 fb(-1). The differential cross sections are measured for each jet flavour with respect to the transverse energy of the leading photon in two photon pseudorapidity regions: vertical bar eta(gamma)vertical bar < 1.37 and 1.56 < vertical bar eta(gamma)vertical bar < 2.37. The measurement covers photon transverse energies 25 < E-T(gamma) < 400 GeV and 25 < E-T(gamma) < 350 GeV respectively for the two vertical bar eta(gamma)vertical bar regions. For each jet flavour, the ratio of the cross sections in the two vertical bar eta(gamma)vertical bar regions is also measured. The measurement is corrected for detector effects and compared to leading-order and next-to-leading-order perturbative QCD calculations, based on various treatments and assumptions about the heavy-flavour content of the proton. Overall, the predictions agree well with the measurement, but some deviations are observed at high photon transverse energies. The total uncertainty in the measurement ranges between 13% and 66%, while the central gamma+b measurement exhibits the smallest uncertainty, ranging from 13% to 27%, which is comparable to the precision of the theoretical predictions. (c) 2017 The Author. Published by Elsevier B.V
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