The Compton effect, in computer lab workshop and lecture demonstrations in physics

Described a computer model for the demonstration of the Compton effect in lectures and laboratory practicum in physics courseОписана компьютерная модель для демонстрации эффекта Комптона на лекциях и лабораторном практикуме в курсе физик

DEVELOPMENT OF A VIRTUAL LABORATORY WORK «OHM’S LAW FOR A CLOSED (COMPLETE) CIRCUIT»

Features of this work-the interface is close to full-scale laboratory work, virtual devices are resistant to any electrical overload, the laboratory work program runs directly from the flash drive.Описана виртуальная лабораторная работа на тему «Закон Ома для замкнутой (полной) цепи», интерфейс которой близок к натурной лабораторной работе, при этом виртуальные приборы устойчивы к любым электрическим перегрузкам, программа лабораторной работы запускается непосредственно с флеш-носителя

The spectrum of hydrogen in a computer laboratory

The article describes a computer model of laboratory work on the study series Balmer in the spectrum of hydrogenВ статье описана компьютерная модель лабораторной работы по исследованию серии Бальмера в спектре водород

Trivalent zirconium and hafnium ions in yttria-based transparent ceramics

Electron paramagnetic resonance spectra of transparent yttria-based ceramics with zirconium and hafnium additives contain signals with close parameters due to paramagnetic Zr3+ and Hf3+ ions, which have similar ground-state electron configurations of [Kr]4d 1 and [Xe]5d 1, respectively. © 2013 Pleiades Publishing, Ltd

The MFA ground states for the extended Bose-Hubbard model with a three-body constraint

We address the intensively studied extended bosonic Hubbard model (EBHM) with truncation of the on-site Hilbert space to the three lowest occupation states n=0,1,2 in frames of the S=1 pseudospin formalism. Similar model was recently proposed to describe the charge degree of freedom in a model high-Tc cuprate with the on-site Hilbert space reduced to the three effective valence centers, nominally Cu^{1+;2+;3+} . With small corrections the model becomes equivalent to a strongly anisotropic S=1 quantum magnet in an external magnetic field. We have applied a generalized mean-field approach and quantum Monte-Carlo technique for the model 2D S=1 system with a two-particle transport to find the ground state phase with its evolution under deviation from half-filling.Comment: 9 pages, 3 figure

Magnetic properties and structure of TiO2-Mn (0.73 %) nanopowders: The effects of electron irradiation and vacuum annealing

Nanopowder TiO2-0.73 % Mn was synthesized by the sol-gel method. Thermal treatment of the samples was carried out in vacuum at a temperature of 500°C. Magnetic properties were studied in the temperature range from 2 to 850 K. The effects of electron irradiation and vacuum annealing on the EPR spectra and magnetic properties of TiO2-Mn powder are discussed. It was established that a part of manganese ions in the anatase crystal lattice interacts antiferromagnetically, which causes a decrease in magnetization as compared to the result of the calculation for non-interacting ions. Vacuum annealing leads to the formation of oxygen vacancies and, at the same time, to a noticeable increase in the ferromagnetic contribution to magnetization, especially, after preliminary electron irradiation. We assume that the ferromagnetic contribution to the magnetization appears either due to incomplete compensation of antiferromagnetically directed moments of manganese ions, or due to positive exchange interactions of Mn ions via defects in the TiO2 lattice. It is shown that the temperature of magnetic disordering in samples with a spontaneous magnetic moment exceeds 600°C. © 2019, Institute for Metals Superplasticity Problems of Russian Academy of Sciences. All rights reserved

Social Distancing and the Deficit of Presence (Philosophical Reflection of the Covid-19 Pandemic)

The paper claims that if the COVID-19 pandemic turned out to be a man-made risk (А. Giddens), i.e. an unforeseen consequence of a person’s own behavior and actions, then in order to avoid such fatal contingences that occur so unexpectedly, it is necessary to change the type of behavior and actions that have established in the culture of the Modern Period. During the pandemic people are forced to observe the spatial order. Distancing, self-isolation, the Red Zone and other spatial limitations made people acutely aware of the deficit of presence, the lack of their independent active participation in life. The new virus, on the one hand, returned a person to the awareness of the biological, natural origin of human existence, which has been forgotten by culture (science). On the other hand, the practices of social rationing and restriction revealed the influence of various forms of alienation — social, political, economic, cultural — on the fate of each individual. The introduction of the bioprinciple (the virus) into the social, cultural and political space radically changes the relationship between people and nature. This situation makes one think about the meaning of the notion of culture, which got its definition in the 18th century and is understood as non-nature reflected in the formula culture vs nature. The paper shows that the cultural ideal of human activity, which was established in modern times, became the reason of the alienation of technogenic civilization and social forms of life from nature. By destroying nature, turning it into the material for people’s various techne, people found themselves in conflict with their own life. Culture has lost its inner meaning of the presence of the world and of an individual which dissolved in various interpretations and ideas. Contemporary history is moving towards the establishment of a culture of Presence, where the world is viewed not as a mere material to be used, but an area for humans to engage with. What we see today is the assertion of the right to difference and the right to the presence of diversity — in nature, culture, politics (struggle for a multipolar world), in the personal domain (selfies, blogs, chats, etc.)

MODEL OF LABORATORY INSTALLATION FOR ELECTROSTATICS

The article describes a model of laboratory work on a computer in the field of electrostatics. The advantages of virtual laboratory work over the same normal work are shown. Examples of virtual laboratory work are given.В статье описана модель лабораторной работы на компьютере из области электростатики. Показаны преимущества виртуальной лабораторной работы перед такой же обычной работой. Даны примеры выполнения виртуальной лабораторной работы

Unconventional magnetism of non-uniform distribution of Co in TiO2 nanoparticles

High-resolution transmission electron microscopy (HRTEM), X-ray diffraction (XRD) analysis, electron paramagnetic resonance (EPR), X-ray absorption spectroscopy (XAS), magnetic methods, and density-functional theory (DFT) calculations were applied for the investigations of Co-doped anatase TiO2 nanoparticles (∼20 nm). It was found that high-spin Co2+ ions prefer to occupy the interstitial positions in the TiO2 lattice which are the most energetically favourable in compare to the substitutional those. A quantum mechanical model which operates mainly on two types of Co2+ – Co2+ dimers with different negative exchange interactions and the non-interacting paramagnetic Co2+ ions provides a satisfactorily description of magnetic properties for the TiO2:Co system. © 2020 Elsevier B.V.Russian Foundation for Basic Research. Ministry of Science and Higher Education of the Russian Federatio

Computer lecture demonstration of the properties of semiconductor diode

Described a computer model to demonstrate the properties of the semiconductor diode in the classroom physics courseОписана компьютерная модель для демонстрации свойств полупроводникового диода на занятиях курса физик