146 research outputs found
ab-plane tunneling and Andreev spectroscopy of superconducting gap and pseudogap in (Bi,Pb)2Sr2Ca2Cu3O10 and Bi2Sr2CaCu2O8
We have measured the temperature dependence of gap features revealed by
Andreev reflection Delta_s and by tunneling Delta in the ab-plane of optimal
and slightly overdoped microcrystals of (BiPb)2Sr2Ca2Cu3O10 (Bi2223) with
critical temperature Tc=110-115 K, and Bi2Sr2CaCu2O8 (Bi2212) with Tc=80-84 K.
The tunneling conductance of Bi2223-Insulator-Bi2223 junction shows peaks at
the 2Delta gap voltage, as well as dips and broad humps at other voltages. In
Bi2223, similarly to the well known Bi2212 spectra, the energies corresponding
to 2Delta, to the dip, and to the hump structure are in the ratio of 2:3:4.
This confirms that the dip and hump features are generic to the high
temperature superconductors, irrespective of the number of CuO2 layers or the
BiO superstructure. On the other hand, in both compounds Delta(T) and
Delta_s(T) dependences are completely different, and we conclude that the two
entities have different nature.Comment: LaTeX 2e, 17 pages, 7 figures in .eps forma
Tunable high-energy ion source via oblique laser pulse incidence on a double-layer target
The laser-driven acceleration of high quality proton beams from a
double-layer target, comprised of a high-Z ion layer and a thin disk of
hydrogen, is investigated with three-dimensional particle-in-cell simulations
in the case of oblique incidence of a laser pulse. It is shown that the proton
beam energy reaches its maximum at a certain incidence angle of the laser
pulse, where it can be much greater than the energy at normal incidence. The
proton beam propagates at some angle with respect to the target surface normal,
as determined by the proton energy and the incidence angle
Formation of singularities on the surface of a liquid metal in a strong electric field
The nonlinear dynamics of the free surface of an ideal conducting liquid in a
strong external electric field is studied. It is establish that the equations
of motion for such a liquid can be solved in the approximation in which the
surface deviates from a plane by small angles. This makes it possible to show
that on an initially smooth surface for almost any initial conditions points
with an infinite curvature corresponding to branch points of the root type can
form in a finite time.Comment: 14 page
Chaotic Interaction of Langmuir Solitons and Long Wavelength Radiation
In this work we analyze the interaction of isolated solitary structures and
ion-acoustic radiation. If the radiation amplitude is small solitary structures
persists, but when the amplitude grows energy transfer towards small spatial
scales occurs. We show that transfer is particularly fast when a fixed point of
a low dimensional model is destroyed.Comment: LaTex + 4 eps file
On modulational instability and energy localization in anharmonic lattices at finite energy density
The localization of vibrational energy, induced by the modulational
instability of the Brillouin-zone-boundary mode in a chain of classical
anharmonic oscillators with finite initial energy density, is studied within a
continuum theory. We describe the initial localization stage as a gas of
envelope solitons and explain their merging, eventually leading to a single
localized object containing a macroscopic fraction of the total energy of the
lattice. The initial-energy-density dependences of all characteristic time
scales of the soliton formation and merging are described analytically. Spatial
power spectra are computed and used for the quantitative explanation of the
numerical results.Comment: 12 pages, 7 figure
On Field Induced Diaelastic Effect in a Small Josephson Contact
An analog of the diaelastic effect is predicted to occur in a small Josephson
contact with Josephson vortices manifesting itself as magnetic field induced
softening of the contact shear modulus C(T,H). In addition to Fraunhofer type
field oscillations, C(T,H) is found to exhibit pronounced flux driven
temperature oscillations near T_C
Innovative pedagogical forms of medical education of students of a medical university: the experience of the department of psychology and pedagogy
An experiment of the Department of Psychology and Pedagogy of Ural State Medical University on realization of innovative pedagogical forms of education of students of a medical school is exposed in this article. Such innovative pedagogical forms as story-role modelling of situations, art-therapeutic classes, mediation techniques of conflict management and project activities are presented and described. These pedagogical forms are relevant in the conditions of medical education and are focused on formation of common cultural and professional competences.В статье показан опыт кафедры психологии и педагогики УГМУ по реализации инновационных педагогических форм обучения студентов медицинского вуза. Представлено краткое описание таких форм практических занятий как сюжетно-ролевое моделирование ситуаций, арт-терапевтические занятия, медиативные формы управления конфликтами, проектная деятельность. Эти педагогические формы доказали эффективность при реализации концепции практико-ориентированного медицинского образования и нацелены на формирование как общекультурных, так и общепрофессиональных компетенций будущих медицинских работников
Assessment of practical skills in primary accreditation of the specialist on the methody of «simulated patient»: the results of the piloting station «history in the primary outpatient medical visit”
The description and results of realization of the pilot project within the second stage of primary accreditation of specialists in 2017 (specialty «Medical job») are briefly presented. The pilot project’s goal is to assess the real opportunities of realization examination of the effective communicative skills to with patients during the collection of complaints and anamnesis on a primary outpatient medical appointment. The pilot station was tested in two universities: the First Moscow State Medical University and the Urals State Medical University, Yekaterinburg.Кратко представлены описание и результаты реализации пилотного проекта в рамках второго этапа первичной аккредитации специалистов в 2017 году (специальность «Лечебное дело»). Цель пилота — оценка возможностей реализации экзамена по владению практическими навыками эффективного общения с пациентами при сборе жалоб и анамнеза на первичном амбулаторном врачебном приеме. Пилотная станция проходила апробацию в двух вузах: Первом Московском государственном медицинском университете им. И.М. Сеченова и Уральском государственном медицинском университете, г. Екатеринбург
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