695 research outputs found
Comparing 3C 120 jet emission at small and large scales
Context. Important information on the evolution of the jet can be obtained by
comparing the physical state of the plasma at its propagation through the
broad-line region (where the jet is most likely formed) into the intergalactic
medium, where it starts to significantly decelerate. Aims. We compare the
constraints on the physical parameters in the innermost ( pc) and outer
( kpc) regions of the 3C 120 jet by means of a detailed multiwavelength
analysis and theoretical modeling of their broadband spectra. Methods.The data
collected by Fermi LAT, Swift and Chandra are analyzed together and the
spectral energy distributions are modeled using a leptonic synchrotron and
inverse Compton model, taking into account the seed photons originating inside
and outside of the jet. The model parameters are estimated using the MCMC
method. Results. The -ray flux from the inner jet of 3C 120 was
characterized by rapid variation from MJD 56900 to MJD 57300. Two strong flares
were observed on April 24, 2015 when, within 19.0 minutes and 3.15 hours the
flux was as high as and
respectively. The broadband
emission in the quiet and flaring states can be described as SSC emission while
IC scattering of dusty torus photons cannot be excluded for the flaring states.
The X-ray emission from the knots can be well reproduced by IC scattering of
CMB photons only if the jet is highly relativistic (since even when
still ). These extreme requirements can be somewhat
softened assuming the X-rays are from the synchrotron emission of a second
population of very-high-energy electrons. Conclusions. We found that the jet
power estimated at two scales is consistent, suggesting that the jet does not
suffer severe dissipation, it simply becomes radiatively inefficient.Comment: Accepted for publication in Astronomy & Astrophysics. The abstract
has been shortened to comply with the size limit set by arXi
Weak localization of holes in high-mobility heterostructures
Theory of weak localization is developed for two-dimensional holes in
semiconductor heterostructures. Ballistic regime of weak localization where the
backscattering occurs from few impurities is studied with account for
anisotropic momentum scattering of holes. The transition from weak localization
to anti-localization is demonstrated for long dephasing times. For stronger
dephasing the conductivity correction is negative at all hole densities due to
non-monotonous dependence of the spin relaxation time on the hole wavevector.
The anomalous temperature dependent correction to the conductivity is
calculated. We show that the temperature dependence of the conductivity is
non-monotonous at moderate hole densities.Comment: 5 pages, 4 figure
Modern technologies in vocational education
The article analyzes the further development of vocational education, which is possible in the revision of the theoretical approaches and the application of new educational technologies. Pedagogical technologies allow to transform the learning process to the path of its preliminary design followed by the reproductionАнализируется дальнейшее развитие профессионально-технического образования, которое возможно при пересмотре теоретических подходов и применении новых педагогических технологий. Педагогические технологии позволяют перевести процесс обучения на путь предварительного его проектирования с последующим воспроизведение
FORMATION GOTOVNOCTI STUDENTS OF TECHNICAL COLLEGES TO THE CHOICE INDIVIDUAL EDUCATIONAL TRAJECTORIES
The article deals with the choice of educational trajectories of students of technical colleges. It seeks to clarify the concept of "individual educational trajectory", and based on the analysis of existing learning environment the necessity of formation students’ readiness to individual choice of educational trajectories in the modern educational space.Статья посвящена проблеме выбора образовательных траекторий студентами технических вузов. В ней предпринята попытка уточнения понятия «индивидуальная образовательная траектория», а также на основе анализа существующих условий обучения обосновывается необходимость формирования готовности студентов к выбору индивидуальных образо-вательных траекторий в современном образовательном пространстве
The problem of choosing individual educational тrajectories by students of technical universities in terms of international educational activities
The article deals with the choice of educational trajectories by students in the international educational space. It attempts to clarify the terms «educational space» and «educational trajectory»Статья посвящена проблеме выбора образовательных траекторий студентами технических вузов в международном образовательном пространстве. В ней предпринята попытка уточнения терминов «образовательное пространство» и «образовательная траектория
Modular training as one of the modern technologies of teaching and learning process
The article discusses the modular training as a way of modernization and efficiency of the educational process. Actualizes the role of the teacher as the controlling unit for the efficiency and quality of teaching-learning processВ статье рассматривается модульное обучение как один из способов модернизации и эффективности учебного процесса. Актуализируется роль преподавателя как контролирующего звена для эффективности и качества учебного-познавательного процесс
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