Self field measurements by Hall sensors on the SeCRETS short sample CICC's subjected to cyclic load

An imbalance in the transport current among the strands of a Cable-in-Conduit conductors (CICC) can be associated with the change of their performance. In order to understand and improve the performance of CICC's, it is essential to study the current imbalance. This paper focuses on the study of the current imbalance in two short samples of the SeCRETS (Segregated Copper Ratio Experiment on Transient Stability) conductors subjected to a cyclic load in the SULTAN facility. The self field around the conductors was measured on four locations by 32 miniature Hall sensors for a reconstruction of the current distribution. The results of the self field measurements in the DC tests are presented and discussed

Langmuir wave linear evolution in inhomogeneous nonstationary anisotropic plasma

Equations describing the linear evolution of a non-dissipative Langmuir wave in inhomogeneous nonstationary anisotropic plasma without magnetic field are derived in the geometrical optics approximation. A continuity equation is obtained for the wave action density, and the conditions for the action conservation are formulated. In homogeneous plasma, the wave field E universally scales with the electron density N as E ~ N^{3/4}, whereas the wavevector evolution varies depending on the wave geometry

Computer Microscopy of Biological Fluid Dry Patterns for Medical Diagnostics

We elaborate hardware and software system that implements the principle of diagnosis based on the standard procedure of pattern preparation including digital recognition of image and its computer analysis based on specially developed algorithms by comparing with the expert descriptors and extensive database of dry pattern samples obtained from clinical treatments which include more than 1500 samples to high selective and accuracy recognition of pathologies, for recognition of wide range of pathologies, in particular, the endogenous intoxication. Keywords: biological fluids, image analysis, medical diagnostics, endogenous intoxication

Semiclassical treatment of logarithmic perturbation theory

The explicit semiclassical treatment of logarithmic perturbation theory for the nonrelativistic bound states problem is developed. Based upon $\hbar$-expansions and suitable quantization conditions a new procedure for deriving perturbation expansions for the one-dimensional anharmonic oscillator is offered. Avoiding disadvantages of the standard approach, new handy recursion formulae with the same simple form both for ground and exited states have been obtained. As an example, the perturbation expansions for the energy eigenvalues of the harmonic oscillator perturbed by $\lambda x^{6}$ are considered.Comment: 6 pages, LATEX 2.09 using IOP style

Individualization and digitalization of creative development of students in chemistry lessons

Background. In the context of increasing robotization and digitalization of most of the routine and algorithmic types of human activity, the problem of the creative development of each child and the individualization of education in a public school, especially in the field of natural science education, arises.The aim. To study the prerequisites and opportunities for digitalization of the creative development of students as a means of increasing the reflexivity of their mental activity in solving creative problems and individualizing the educational process in a public school based on the subject of chemistry.Methods. At the first stage of the study, a survey of chemistry teachers was used. At the second stage, diagnostic tasks in chemistry were developed to verify the identified stereotypes; at the third stage, ways were studied to overcome stereotyped ideas in chemistry by schoolchildren; and at the fifth stage, the possibility of digitizing mental actions using the CREO_DATUM computer program was studied.Results. Of the 70 different variants of erroneous ideas in the school chemistry course, 18 thinking stereotypes turned out to be the most common. The possibility of overcoming stereotypes is not associated with additional classes and explanations of teachers, but with the independent solution of creative tasks by students, since in this process the reflection of schoolchildren develops, which is a condition for overcoming stereotypes. The optimal time in the classroom for students to complete short creative tasks is 10–12 minutes. It is sufficient to measure such creative actions of students as divergence, criticality, uniqueness. To digitize the mental activity of students when solving creative problems in chemistry and to automate the construction of graphs for the creative development of each student, the CREO_DATUM program was developed and tested.Conclusion. Long-term studies of the possibility of using subject-creative tasks based on the material of a school chemistry course for the development of creativity and reflexivity of students serve as a rationale for designing digital means for individualizing the creative development of students

Stochastic resonance in a superparamagnetic particle

Abstract The stochastic resonance (SR) effect in a single-domain particle is investigated for the case where the exciting field is imposed not parallel to the anisotropy axis but at an arbitrary angle. We show that despite the fact that for the transverse case there is no SR at all, the intermediate cases yield signal-to-noise ratios much higher than the wellinvestigated longitudinal case. The frequency range over which the effect is observable is estimated. r 2002 Elsevier Science B.V. All rights reserved. Keywords: Superparamagnetic dynamics; Stochastic resonance; Signal-to-noise ratio The phenomenon of stochastic resonance (SR) is inherent to noise-driven multistable systems. As it always happens with the effects related to Brownian motion, it has a very wide range of applicability In magnetism, the SR effect turns up in several situations. In particular, in a single-domain ferromagnetic particle with uniaxial anisotropy. In the absence of interaction with the neighbours the particle orientationdependent energy is where e; n and h are the unit vectors of the particle magnetic moment, anisotropy axis and the external field, respectively; K is the effective anisotropy constant (for uniaxial anisotropy it is essentially positive), m ¼ I s V is the magnetic moment of a single-domain particle, I s its magnetization and V its volume. As Eq. Reducing the problem to a one-dimensional equation (as is typical for the basic SR theory), the authors find that in the limit o-0 and in the linear response theory approximation, magnetic stochastic resonance is described by some universal curve, SNR 0 ð1=sÞ: This curve corresponds to the cross-section b ¼ 0 of the surface i

Modern endoscopic criteria for stratifiation of patients with atrophic gastritis in the development of precancerous changes of the stomach

Purpose: to identify the most signifiant endoscopic diagnostic criteria for the development of precancerous changes of the of the stomach mucosa (SM). Material and methods. 80 patients with atrophic gastritis were examined (34 (42.5 %) men and 46 (57.5 %) women, the average age (57.7 ± 2.1) years. The diagnosis was set during endoscopic examinations and was morphologically confimed in all cases. Esophagogastroduodenoscopy was performed using EVIS EXERA III video endoscopic system with Olympus 190 gastroscope (Japan). Examination of the stomach was carried out in white light regimen, magnifiation (near focus) and NBI regimen. All examined patients were divided into groups according to the presence and prevalence of intestinal metaplasia (IM) and the presence of SM dysplasia: group I – SM atrophy without IM (10 patients), II – SM atrophy with IM, limited of the antral part (20 patients), III – SM atrophy with diffse (multifocal) IM (39 patients), IV – SM dysplasia (11 patients). Results. For the formation of group of patients with high risk of developing gastric cancer, diagnostic criteria of structural changes of gastric mucosa with pre-cancerous potential were identifid. In white light upper endoscopy, the knotted / tuberous relief of the stomach mucosa can be considered as a diagnostic criterion for sensitivity (81.4 %) and specifiity (60.0 %) indicators. The xanthomatosis of the stomach mucosa increases by 5 times the risk of IM or dysplasia in patients with atrophic gastritis (sensitivity – 47.1 %, specifiity – 90.0 %). Magnifiation endoscopy and endoscopy with narrow-band imaging allowed us to establish another diagnostic criterion for the formation of the group with high risk of developing gastric cancer: pyloric metaplasia (pseudopylorisation) of the gastric corpus. Pyloric metaplasia increases the frequency of detection of structural precancerous changes in a patient with atrophic gastritis by almost 7 times (sensitivity – 71.4 %, specifiity – 70.0 %). Conclusion. The established endoscopic criteria (nodular relief of the stomach (OR = 4.96), xanthomatosis of the stomach (OR = 4.94), pyloric metaplasia of the stomach body (OR = 6.72)) can be applied in the formation of a group of patients with atrophic gastritis who have high potential for the development of gastric cancer and require careful examination using modern endoscopic equipment and dynamic surveillance