Phase Transition in a One-Dimensional Extended Peierls-Hubbard Model with a Pulse of Oscillating Electric Field: III. Interference Caused by a Double Pulse

In order to study consequences of the differences between the ionic-to-neutral and neutral-to-ionic transitions in the one-dimensional extended Peierls-Hubbard model with alternating potentials for the TTF-CA complex, we introduce a double pulse of oscillating electric field in the time-dependent Schr\"odinger equation and vary the interval between the two pulses as well as their strengths. When the dimerized ionic phase is photoexcited, the interference effect is clearly observed owing to the coherence of charge density and lattice displacements. Namely, the two pulses constructively interfere with each other if the interval is a multiple of the period of the optical lattice vibration, while they destructively interfere if the interval is a half-odd integer times the period, in the processes toward the neutral phase. The interference is strong especially when the pulse is strong and short because the coherence is also strong. Meanwhile, when the neutral phase is photoexcited, the interference effect is almost invisible or weakly observed when the pulse is weak. The photoinduced lattice oscillations are incoherent due to random phases. The strength of the interference caused by a double pulse is a key quantity to distinguish the two transitions and to evaluate the coherence of charge density and lattice displacements.Comment: 16 pages, 8 figure

Internet technology of seminars and control of homework of software development

At the present stage of an intensification of educational process there is actual a problem of preservation of quality of training by increase of overall performance of the teacher. In article questions of automation of remote interaction of students with the teacher when studying of the interpreted programming languagesНа современном этапе интенсификации учебного процесса становится актуальной задача сохранения качества обучения путем повышения эффективности работы преподавателя. В статье рассматриваются вопросы автоматизации удаленного взаимодействия студентов с преподавателем при изучении интерпретируемых языков программировани

Problems of control of progress and their software solution

The article considers verbal-communicative and the technical problems arising during monitoring procedure of progress of students on computers of the computer network. For the purpose of the solution of these problems the technique including a complex of the organizational actions and technical means allocated for increase of efficiency and comfort of work of the teacher is developedВ статье рассмотрены вербально-коммуникативные и технические проблемы, возникающие в ходе проведения контроля успеваемости студентов на компьютерах вычислительной сети. С целью решения этих проблем разработана методика, включающая комплекс организационных мероприятий и технических средств, направленных на повышение эффективности и комфорта работы преподавател

Giant Keplerate molecule Fe30 - the first octopole magnet

The multipole expansion technique is applied to one of the largest magnetic molecules, Fe30. The molecule's dipole, toroid and quadrupole magnetic moments are equal to zero (in the absence of magnetic field) so the multipole expansion starts from the octopole moment. Probably the Fe30 molecule is the most symmetrical magnetic body synthesized so far. The magnetization process is considered theoretically in different geometries. Some components of the octopole moment experience a jump while the magnetization rises linearly up to its saturation value. An elementary octopole moment consisting of four magnetic dipoles is proposed as a hint for designing of an experiment for measurement of octopole magnetic moment components.Comment: 7 pages, 9 figure

Casting individual cervical telescopic implants for burn-out SLA-models

© Published under licence by IOP Publishing Ltd. The production of individual implants, modeled specifically for a specific clinical case, is increasingly used every year in traumatology and oncology. Traditionally, individual implants are made on five coordinate milling CNC machines. However, the need to create individual implants with a mesh structure requires the search for new ways of production. In this paper, the feasibility of casting telescopic implants, obtained by laser stereolithography, has been studied. The process of burning photopolymer from a flask was studied. Inducast installation cast prototypes of cervical implants. The ineffectiveness of this technology in the manufacture of mesh collapsible telescopic implants has been established, but it can be used for structures with a thickness of 1 mm

Depth concentrations of deuterium ions implanted into some pure metals and alloys

Pure metals (Cu, Ti, Zr, V, Pd) and diluted Pd-alloys (Pd-Ag, Pd-Pt, Pd-Ru, Pd-Rh) were implanted by 25 keV deuterium ions at fluences in the range (1.2{\div}2.3)x1022 D+/m2. The post-treatment depth distributions of deuterium ions were measured 10 days and three months after the implantation using Elastic Recoil Detection Analysis (ERDA) and Rutherford Backscattering (RBS). Comparison of the obtained results allowed to make conclusions about relative stability of deuterium and hydrogen gases in pure metals and diluted Pd alloys. Very high diffusion rates of implanted deuterium ions from V and Pd pure metals and Pd alloys were observed. Small-angle X-ray scattering revealed formation of nanosized defects in implanted corundum and titanium.Comment: 12 pages, 9 figure

Manifestation of systemic toxicity in rats after a short-time inhalation of lead oxide nanoparticles

Outbred female rats were exposed to inhalation of lead oxide nanoparticle aerosol produced right then and there at a concentration of 1.30 ± 0.10 mg/m3 during 5 days for 4 h a day in a nose-only setup. A control group of rats were sham-exposed in parallel under similar conditions. Even this short-time exposure of a relatively low level was associated with nanoparticles retention demonstrable by transmission electron microscopy in the lungs and the olfactory brain. Some impairments were found in the organism’s status in the exposed group, some of which might be considered lead-specific toxicological outcomes (in particular, increase in reticulocytes proportion, in δ-aminolevulinic acid (δ-ALA) urine excretion, and the arterial hypertension’s development). © 2020 by the authors. Licensee MDPI, Basel, Switzerland.Funding: This work was funded by the budget of the Ekaterinburg Medical Research Center for Prophylaxis and Health Protection in Industrial Workers