205 research outputs found
The innovative organizational forms of the educational process as a way to implement professional standards
This article analyzes innovative organizational forms of educational process in the preparation of college teachers. Under the new conditions the development of the educational program associated with the job functions of professional standards and complement the competences list of the federal state educational standard of college’s profile-specialized competencies. Innovative organizational forms of educational process of college teachers training, which was built with the professional standards, are network education and modular training.Анализируются инновационные формы организации образовательного процесса в подготовке педагогов профессионального обучения. В новых условиях разработка образовательной программы связана с учетом трудовых функций профессионального стандарта и дополнением перечня компетенций Федерального государственного образовательного стандарта высшего образования профильно-специализированными компетенциями. Инновационными формами организации образовательного процесса подготовки педагога профессионального обучения, построенного с учетом профессионального стандарта, являются сетевая форма и модульное обучение
Structural, thermodynamic, and local probe investigations of a honeycomb material AgLiMnO
The system Ag[LiMn]O belongs to a quaternary
3R-delafossite family and crystallizes in a monoclinic symmetry with space
group and the magnetic Mn() ions form a honeycomb
network in the -plane. An anomaly around 50 K and the presence of
antiferromagnetic (AFM) coupling (Curie-Weiss temperature
K) were inferred from our magnetic susceptibility data. The magnetic specific
heat clearly manifests the onset of magnetic ordering in the vicinity of 48\,K
and the recovered magnetic entropy, above the ordering temperature, falls short
of the expected value, implying the presence of short-range magnetic
correlations. The (ESR) line broadening on approaching the ordering temperature
could be described in terms of a Berezinski-Kosterlitz-Thouless
(BKT) scenario with K. Li NMR line-shift probed as a
function of temperature tracks the static susceptibility (K) of
magnetically coupled Mn ions. The Li spin-lattice relaxation rate
(1/) exhibits a sharp decrease below about 50 K. Combining our bulk
and local probe measurements, we establish the presence of an ordered ground
state for the honeycomb system AgLiMnO.Our ab-initio
electronic structure calculations suggest that in the -plane, the nearest
neighbor (NN) exchange interaction is strong and AFM, while the next NN and the
third NN exchange interactions are FM and AFM respectively. In the absence of
any frustration the system is expected to exhibit long-range, AFM order, in
agreement with experiment.Comment: 11 pages, 13 figures, accepted in Phys Rev
Structural and magnetic dimers in the spin-gapped system CuTe2O5
We investigated the magnetic properties of the system CuTe2O5 by
susceptibility and electron spin resonance measurements. The anisotropy of the
effective g-factors and the ESR linewidth indicates that the anticipated
structural dimer does not correspond to the singlet-forming magnetic dimer.
Moreover, the spin susceptibility of CuTe2O5 can only be described by taking
into account interdimer interactions of the same order of magnitude than the
intradimer coupling. Analyzing the exchange couplings in the system we identify
the strongest magnetic coupling between two Cu ions to be mediated by
super-super exchange interaction via a bridging Te ligand, while the
superexchange coupling between the Cu ions of the structural dimer only results
in the second strongest coupling
The Influence of Social Networks on the Formation of Motivation for Sports
Статья посвящена влиянию социальных сетей на формирование мотивации к занятиям спортом. Мотивация играет ключевую роль в успехе любого спортсмена, она стимулирует и поддерживает стремление к достижению высоких результатов и развитию своих навыков. Социальные сети могут благоприятно влиять на мотивацию спортсменов, когда необходима поддержка единомышленников.The article is devoted to the influence of social networks on the formation of motivation to play sports. Motivation plays a key role in the success of any athlete, it stimulates and supports the desire to achieve high results and develop their skills. Social networks are the place where free time is most often spent in modern reality, so they can have a beneficial effect on the motivation of athletes when the support of like-minded people is needed
Singlet-triplet excitations and high-field magnetization in CuTe2O5
By measuring the THz electron spin resonance (ESR) transmission spectra and
high-field magnetization on the spin-gapped system CuTeO, we identified
the singlet-triplet excitations in the dimerized non-magnetic ground state. The
determined spin-gap value of meV at the point
() is significantly smaller than the strongest
antiferromagnetic exchange interaction between the Cu ions predicted by
theoretical investigations. We also observed the critical field
T for \textbf{H} \emph{bc}-plane and
T for \textbf{H} \emph{bc}-plane at the onset of
non-zero magnetization, consistent with the gap value and corresponding
anisotropic \emph{g}-factors determined previously. The observed
singlet-triplet excitations in Faraday and Voigt configurations suggest a
mixing of the singlet state with the triplet state and the
triplet states, respectively, due to the Dzyaloshinskii-Moriya (DM) interaction
with a DM vector perpendicular to the crystalline \emph{bc}-plane.Comment: 5 pages, 4 figure
Magnetic Resonance of the Intrinsic Defects of the Spin-Peierls Magnet CuGeO3
ESR of the pure monocrystals of CuGeO3 is studied in the frequency range 9-75
GHz and in the temperature interval 1.2-25 K. The splitting of the ESR line
into several spectral components is observed below 5 K, in the temperature
range where the magnetic susceptibility is suppressed by the spin-Peierls
dimerization. The analysis of the magnetic resonance signals allows one to
separate the signals of the S=1/2- and S=1 defects of the spin-Peierls phase.
The value of g-factor of these signals is close to that of the Cu-ion. The
additional line of the magnetic resonance is characterized by an anomalous
value of the g-factor and by the threshold-like increase of the microwave
susceptibility when the microwave power is increasing. The ESR signals are
supposingly attributed to two types of the planar magnetic defects, arising at
the boundaries of the domains of the spin-Peierls state with the different
values of the phase of the dimerization.Comment: LATEX-text, 12 PS-figures, typos corrected, LATEX-style change
Hybrid electron spin resonance and whispering gallery mode resonance spectroscopy of Fe3+ in sapphire
The development of a new era of quantum devices requires an understanding of how paramagnetic dopants or impurity spins behave in crystal hosts. Here, we describe a spectroscopic technique which uses traditional electron spin resonance (ESR) combined with the measurement of a large population of electromagnetic whispering gallery modes. This allows the characterization of the physical parameters of paramagnetic impurity ions in the crystal at low temperatures. We present measurements of two ultrahigh-purity sapphires cooled to 20 mK in temperature, and determine the concentration of Fe3 ions and their frequency sensitivity to a dc magnetic field. Our method is different from ESR in that it is possible to track the resonant frequency of the ion from zero applied magnetic field to any arbitrary value, allowing excellent measurement precision. This high precision reveals anisotropic behavior of the Zeeman splitting. In both crystals, each Zeeman component demonstrates a different g factor
Magnetization and specific heat of the dimer system CuTe2O5
We report on magnetization and specific heat measurements on
single-crystalline CuTe2O5. The experimental data are directly compared to
theoretical results for two different spin structures, namely an alternating
spin-chain and a two-dimensional (2D) coupled dimer model, obtained by Das et
al. [Phys. Rev. B 77, 224437 (2008)]. While the analysis of the specific heat
does not allow to distinguish between the two models, the magnetization data is
in good agreement with the 2D coupled dimer model.Comment: 5 pages, 3 figure
Renal Thrombotic Microangiopathy in Mice with Combined Deletion of Endocytic Recycling Regulators EHD3 and EHD4
Eps15 Homology Domain-containing 3 (EHD3), a member of the EHD protein family that regulates endocytic recycling, is the first protein reported to be specifically expressed in the glomerular endothelium in the kidney; therefore we generated Ehd3–/– mice and assessed renal development and pathology. Ehd3–/– animals showed no overt defects, and exhibited no proteinuria or glomerular pathology. However, as the expression of EHD4, a related family member, was elevated in the glomerular endothelium of Ehd3–/– mice and suggested functional compensation, we generated and analyzed Ehd3–/–; Ehd4–/– mice. These mice were smaller, possessed smaller and paler kidneys, were proteinuric and died between 3–24 weeks of age. Detailed analyses of Ehd3–/–; Ehd4–/– kidneys demonstrated thrombotic microangiopathy (TMA)-like glomerular lesions including thickening and duplication of glomerular basement membrane, endothelial swelling and loss of fenestrations. Other changes included segmental podocyte foot process effacement, mesangial interposition, and abnormal podocytic and mesangial marker expression. The glomerular lesions observed were strikingly similar to those seen in human pre-eclampsia and mouse models of reduced VEGF expression. As altered glomerular endothelial VEGFR2 expression and localization and increased apoptosis was observed in the absence of EHD3 and EHD4, we propose that EHD-mediated endocytic traffic of key surface receptors such as VEGFR2 is essential for physiological control of glomerular function. Furthermore, Ehd3–/–; Ehd4–/– mice provide a unique model to elucidate mechanisms of glomerular endothelial injury which is observed in a wide variety of human renal and extra-renal diseases
Advances in our understanding of the pathogenesis of glomerular thrombotic microangiopathy
Glomerular thrombotic microangiopathy is a hallmark feature of haemolytic uraemic syndrome, the leading cause of acute renal failure in childhood. This paper is a review of the different mechanistic pathways that lead to this histological picture in the kidney. It will focus on atypical HUS and complement dysregulation, but will also highlight some other recent advances in our understanding of this condition, including the potential role of the molecule vascular endothelial growth factor- A (VEGF-A)
- …