bluuebunny/crossref_metadata_2025 huggingface dataset:
Epilepsie en taalproblemen
Authors: Rouhl Rob , Vlooswijk Mariëlle , Nobel Ellen
Published: December 2021

Bij patiënten met epilepsie kan een algemene cognitieve functie zoals de mentale verwerkingssnelheid aangedaan zijn, maar ook selectief één of enkele specifieke cognitieve domeinen. Zo komen er ook problemen met taal en aanverwante functies voor bij volwassenen met epilepsie. Deze taalproblemen kunnen een gevolg zijn van de epilepsie zelf, maar ook van de behandeling met anti-epileptica of het gevolg van epilepsiechirurgie. In deze bijdrage een kort overzicht van taalproblemen bij volwassen patiënten met epilepsie.
Het belang van nachtelijke aanvalsdetectie
Authors: Arends Johan , Leijten Frans
Published: December 2021

Het detecteren van epileptische aanvallen is vooral van belang tijdens de nacht. In deze periode is geen goede observatie mogelijk en treden relatief veel aanvallen op. Ook kan plotselinge dood door epilepsie optreden (Sudden Unexpected Death in Epilepsy, SUDEP). Daarom is er behoefte aan een alarmeringssysteem voor nachtelijke epileptische aanvallen. Dat geldt voor de chronische professionele zorg, met personeelstekorten in de nacht, en voor ouders van een kind met nachtelijke aanvallen. Uit EEG-registraties blijkt dat patiënten hun nachtelijke aanvalsfrequentie onderschatten, terwijl verwanten vaak het gevoel hebben dat er een gebrek is aan controle wanneer de persoon met een epileptische aanval hulp nodig heeft.
Vroege medicatie-afbouw na kinderepilepsiechirurgie
Authors: Boshuisen Kim , Uiterwaal Cuno , Braun Kees
Published: December 2021

In de loop van de tijd is de visie ten aanzien van afbouw van anti-epileptica na kinderepilepsiechirurgie veranderd. Hier wordt het onderzoek beschreven dat is gedaan naar het effect van afbouw van anti-epileptica bij deze kinderen. Ook wordt aangegeven hoe het resultaat van dit onderzoek heeft bijgedragen aan de verandering van het postoperatieve medicatiebeleid.
Een predictiemodel voor de kans op recidief-aanvallen
Authors: Lamberink Herm , Geleijns Karin , Otte Willem , Braun Kees
Published: December 2021

Van de mensen die baat hebben bij medicatie en aanvalsvrij worden kan een groot deel na enige tijd de therapie staken zonder dat aanvallen terugkeren. Dit roept meteen twee vragen op: (1) wie kan veilig de anti-epileptica staken en (2) hoe lang dient men te wachten voordat de medicatie afgebouwd kan worden? Om elk van deze vragen te beantwoorden werden twee predictiemodellen ontwikkeld. Deze modellen en het resultaat van toepassing hiervan worden hier besproken.
Op weg naar efficiënte zorg waar de patiënt centraal staat
Authors: De Kinderen Reina
Published: December 2021

Op woensdag 5 juli 2017 promoveerde Ben Wijnen aan de Universiteit van Maastricht op het proefschrift Health Technology Assessment in Epilepsy - moving towards patient-centered, efficient care, Het proefschrift beschrijft 1) methodologische aspecten en voorkeurstudies in Health Technology Assessment binnen het veld van de epilepsie en 2) economische evaluaties binnen het veld van de epilepsie.
Failings in holotype deposition of twelve plant names
Authors: Bandyopadhyay S. , Krishna Gopal , Venu P.
Published: December 2021

This paper points out that the holotypes of twelve plant names were deposited in herbaria other than those stated in the protologues.
Pelaksanaan Upaya Meningkatkan Hasil Belajar Peserta Didik Pada Mata Pelajaran Fikih Melalui Metode Demonstrasi Berbasis ICT
Authors: Mubarok Dadun , Syafe’i.R  , Fathurrohman.A
Published: December 2021

Hasil belajar peserta didik merupakan hal yang sangat penting dalam pendidikan, karena peserta didik menjadi tolak ukur kesuksesasan sebuah pembelajaran, hal ini disesbabkan karena beberapa hal, diantaranya yaitu guru kurang terampil dalam merancang metode dan model pembelajaran.  Tujuan penelitian yang akan dicapai adalah untuk mengetahui pelaksanaan dan evaluasi penggunaan dalam penggunaan metode demonstrasi untuk meningkatkan hasil belajar peserta didik pada mata pelajaran fikih di MTs Manba’ul Ulum Asshiddiqiyah 10 Cianjur. Bentuk penelitian ini menggunakan metode Penelitian Tindakan Kelas (PTK) pada peserta didik kelas Kelas IX (Semnilan) MTs Manba’ul Ulum Ashiddiqiyah 10 Cianjur. Model siklus terdiri dari: perencanaan, pelakasanaan, observasi, refleksi dan evaluasi. Subjek pada penelitian ini yaitu semua siswa kelas IX B sebanyak 20 peserta didik. Dalam penelitian ini terdapat 3 siklus yaitu: pra siklus, siklus I dan siklus II. Pengumpulan data melalui metode tes untuk mengukur ketercapaian KKM dalam mata pelajaran PAI pada materi Fikih. Berdasarkan hasil penelitian dapat disimpulkan bahwa: Pelaksanaan penggunakan metode demonstrasi berbasisi ICT dengan tahapan: pelaksanaan, pembagian kelompok, pada pra siklus menggunakan metode ceramah, siklus I menggunakan metode demosntrasi, siklus II menggunakan metode demosntrasi berbasis ICT.
IMPLEMENTASI NILAI PENDIDIKAN MULTIKULTURAL DI SEKOLAH DASAR (Penelitian Di MI Jamaludin Sampih)
Authors: Wardatushobariah Neng
Published: December 2021

Penelitian ini bertujuan untuk mendeskripsikan yaitu; 1). Peran kepala sekolah dalam implementasi nilai pendidikan multikultural di sekolah, 2). Peran guru dalam mengimplementasikan nilai pendidikan multikultural di sekolah, 3). Pentingnya pendidikan multikultural bagi peserta didik di MIS JAMALUDDIN. Metode penelitian yang digunakan adalah metode kualitatif deskriptif dengan sumber data diperoleh dari kepala sekolah, guru dan siswa. Analisis data yang digunakan yaitu pengumpulan data, reduksi data, penyajian data, dan penarikan kesimpulan/ferivikasi. Teknik pengumpulan data yaitu observasi, wawancara, dan dokumentasi hingga triangulasi. Hasil dari penelitian ini adalah implementasi nilai pendidikan multikultural dapat dilakukan melalui kegiatan intrakurikuler disekolah dapat dilakukan dengan penguatan materi tentang keberagaman yaitu tentang beragam suku, budaya, agama dan adat istiadat.
Economies of Scale Through E-Teaching in the Post-COVID Era – Students’ Improvements Recommendations Using Mixed Methods Design
Authors: Eckhaus Eyal , Davidovitch Nitza
Published: December 2021

This study centers on a retrospective investigation of effective and pedagogic planning of academic digital courses taught during the COVID-19 crisis, from the students’ perspective. We shall focus on the difference between the traditional, teaching-centered paradigm, and the modern learning-centered approach, while emphasizing the formulation of learning outcomes in online study expanses, in light of the learning experience imposed on teachers and students at the various academic institutions.The study explored the learning outcomes from students’ point of view, as well as the benefits and challenges embodied by formulating learning goals in the post-COVID era, according to the learning-centered paradigm, relating to the strengths and weaknesses of the Zoom teaching method from the students’ perspective, predicated on 1,828 students from several institutions. We used a mixed methods design incorporating qualitative and quantitative analysis to develop the Online Teaching Recommendations (SOTR) model. We used Structural Equation Modeling (SEM) for goodness-of-fit.The research findings indicate that the various types of e-learning challenge academic institutions to carry out renewed thinking about the main potential advantage of physical academic institutions where students and teachers meet, talk, and discuss directly and unmediated, compared to virtual bodies of knowledge and teaching that are evolving at present and that are allegedly threatening to render universities irrelevant.
A mathematical model for the 3-D dynamics of lee wave across a meso-scale mountain corner
Authors: DAS PRASANTA , DUTTA SOMENATH , MONDAL SHYAMAL KUMAR
Published: December 2021

A mathematical model for studying the 3-D dynamical structure of lee wave across a meso-scale mountain corner has been proposed for a mean flow with realistic vertical variation of wind and temperature. The basic flow consists of both zonal wind component (U) and meridional component (V), which are assumed to be dependent of height. The Brunt-Vaisala frequency (N) is also assumed to be dependent of height. This model has been applied to the mountain corner, in the North East India, formed by broadly North-South oriented Assam Burma Hills (ABH) and broadly               East-West oriented Khasi Jayantia hills (KJH). The model has been solved following the quasi-numerical approach. The perturbation vertical velocity  is expressed as a double integral. Three cases have been studied and in all cases the relation between the possible transverse and divergent lee wave numbers (k, l) and also the updraft/downdraft regions associated with lee waves at different heights has been mapped and discussed.
Peningkatan Hasil Belajar Peserta Didik dengan Menggunakan Model Pembelajaran Discovery learning pada Kelas XI MA As’adiyah Putri Sengkang
Authors: Hajriani Rini
Published: December 2021

This research is classroom action research. Teachers who are delivering learning materials do not use varied methods and always use the lecture method, so that most students do not understand and are not active in the learning process which results in unsatisfactory student learning outcomes. The purpose of this study was to determine the increase in student learning outcomes through the Discovery Learning cooperative learning model in biology class XI IPA MA As'adiyah Putri Sengkang. The subjects of this study were students of class XI MA As'adiyah Putri Sengkang, totaling 22 students. It was carried out in two cycles. Each cycle was carried out 3 meetings. At the end of cycles I and II, data was collected using a learning outcome evaluation test. The instruments used in this research are learning outcomes test questions and student activity observation sheets. The results showed that the application of the Discovery Learning learning model could improve student learning outcomes in biology class XI IPA 5 MA As'adiyah Putri Sengkang.
Pengaruh Penggunaan Media Benda Asli Terhadap Prestasi Belajar pada Mata Pelajaran IPA Kelas III Sekolah Dasar Negeri No. 6 Pinrang Kabupaten Pinrang
Authors: Agustina
Published: December 2021

This research is a type of experimental research conducted at SD No. 6 Pinrang with the aim of getting an overview of students' ability to use real object media as learning media in biology science subjects in class III. The population of this study were all thirdgrade students, totaling 34 people. Because the population is relatively small, the researchers used a population sample. The population sample was randomized to be divided into two research objects, namely the experimental group and the control group. the experimental group is a group of students who are taught using real object media and the control group is a group of students who are taught without using real object media. Data collection was taken through documentation techniques, experimental techniques, and test techniques and then analyzed statistically using mean analysis. The results of this study illustrate the effect of increasing the writing ability of students who are taught by using serial image media compared to students who are taught without using serial image media, namely 21.4 > 20.4. This research is expected to contribute ideas to the utilization of serial image media in the teaching and learning process to improve students' ability to use real object media.
Study of Diffraction of Surface Plasmon Polaritons at the Rectangular Edge of a Metall-Dielectric Interface in the Terahertz Region
Authors: Gerasimov Vasily , Zhizhin German , Knyazev Boris , Kotelnikov Igor , Nikitin Alexey , Cherkasskij Valeriy
Published: December 2021

Surface plasmon polaritons diffraction at the rectangular edge of a plane gold-dielectric interface was studied using monochromatic terahertz radiation of Novosibirsk free electron laser. Experimental results were compared with the exact solution of the two dimensional diffraction problem. For short distances from the sample edge experimental data reasonably agreed with theory. The field intensity distribution beyond the edge is not symmetrical regarding to the sample surface and extends mainly in the upper hemisphere. In the far zone the electromagnetic field forms a freely-propagating wave which has Lorentzian profile with the divergence depended on the surface impedance. The propagation length of surface plasmon polaritons along bare gold and gold covered with a submicron ZnS layers were measured and amounted to tens of millimeters
Density of Perfluorohexane Near the Evaporation Critical Point
Authors: Stankus Sergey , Khairulin Rashid , Martynets Viktor , Molorodov Yuri
Published: December 2021

The density of n-perfluorohexane along the liquid-vapour coexistence curve has been studied by a gamma-ray attenuation technique over the temperature range from 293.83 to 449.18 K. The critical temperature 449.22  0.05 K, the density 613.8  2 kg/m3 , and the critical exponent of coexistence curve 0.349  0.005 were determined. The approximation equations of the temperature dependence of the liquid and vapor phases density were obtained. The results were compared with the data available in the literature. The influence of hydrostatic effect due to the high compressibility of the substance in the vicinity of the vaporization critical point was observed
Research Photostimulated Luminescence of Solid Solutions ZnS: Cu, Pb
Authors: Galchenko Tatyana , Vorobyov Viktor
Published: December 2021

The dependences of the intensity of the photostimulated luminescence on the concentration of the activator – copper under irradiate by UV light with a wavelength of λ = 365 nm and laser light with λ = 940 nm are detected. On the base of the obtained dependences the optimal composition of the phosphor (Zn0,999-X Pb0,001 CuХ) S is determined. The lead concentration was chosen arbitrarily
Laminar Burning Velocities of Methanol, Ethanol and Numerical Research of Processes of Spontaneous Ignition and Propagation of the Laminar Flame in Rich Mixes of Ethanol with Air
Authors: Khachikian Artem , Bolshova Tatyana , Bunev Valeriy , Babkin Vyacheslav
Published: December 2021

Processes of spontaneous ignition and propagation of a flat laminar flame in ethanol mixes with air investigated by numerical methods. It is shown that in rich mixes in a flame and at spontaneous ignition superadiabatic temperatures develop. Faster process of formation of water appears also more productive in a thermal emission and temperature increase, than slower processes of formation of CO and CO2. Presence of superadiabatic temperatures stabilizes burning of rich mixes of ethanol of subcritical composition
The Analysis of Influence of Characteristics of Radiation of CO2 and Fiber Lasers on the Form and Depth of the Destroyed Surface of а Metal
Authors: Zaitsev Aleksandr , Kovalev Oleg , Smirnova Elena
Published: December 2021

On the basis of model ideas of interaction of laser radiation with metals the results of theoretical and research of influence of radiation wave length with circular polarization of a laser beam on a form of a destroyed surface of stainless steel sheet at a variation of laser power and material thickness are presented. The special attention is paid to the comparative analysis of efficiency of destruction of metal at CO2 laser (with λ = 10.6мкм), and fiber laser (with λ = 1.07мкм), which widely now in use in technological complexes on laser cutting of various sheet materials
Evaporation and Boiling of the Film of Binary Mixture of Freons on a Vertical Cylinder with Wire Mesh Coating
Authors: Volodin Oleg , Pavlenko Aleksandr , Pecherkin Nikolay , Serdyukov Vladimir
Published: December 2021

The paper presents the experimental results on heat transfer in films falling down the vertical cylinder with mesh coating in a wide range of Reynolds’ number (30–270). The mixture of freons R21 and R114 as well as the pure R21 were used as working liquids. The features of heat transfer in falling liquid films on the surface with wire mesh coating compared with the smooth surface have been revealed. It is shown that the heat transfer coefficient at evaporation on the surface with mesh coating is somewhat higher than on the smooth surface; and the nucleate boiling develops earlier on the surface with such a coating. The influence of the initial mixture composition on the coefficient of heat transfer is negligible at evaporation and boiling of binary mixture of freons with close saturation temperatures
Manufacturing of Composite Material Made of Aluminum Matrix Reinforced by Carbon Nanotubes by the Way of Hot Pressing Following by Cold Rolling
Authors: Alekseev Artem , Predtechensky Mikhail
Published: December 2021

The method of manufacturing Al-CNT composite by hot pressing and cold rolling was tried out. Composite with a tensile strength as well as tensile strength of middle strength aluminum alloys was made
Quantitative Study of Excitation of Unsteady Görtler Instability Modes in Concave-Wall Boundary Layer by Free-Stream Turbulence
Authors: Ivanov Andrey , Kachanov Yuriy , Mischenko Dmitriy
Published: December 2021

The paper is devoted to the first experimental study of distributed excitation of Görtler instability modes due the distributed mechanism of receptivity of a concave-wall boundary layer to streamwise freestream vortices. Experiments are carried out in the following range of problem parameters: Görtler numbers G* = 7,4÷21,3, frequencies f = 15, 20, and 26 Hz (nondimensional frequency parameters are F = 17,04; 22,72 and 29,54), and a broad range of spanwise scales of disturbances z = 8÷24 мм (nondimensional scales are Λ = 149÷774). It is found that this receptivity mechanism is quite efficient and can lead to amplification of unsteady Görtler vortices even in regimes where the boundary layer is linearly stable to these boundary-layer disturbances. Estimations of quantitative characteristics of the investigated physical phenomenon: the complex values of the distributed vortex receptivity coefficients are obtained in the present study for the first time. It is found that examined receptivity mechanism is especially effective for vortices with spanwise wavelengths close to the most dangerous in terms of the linear stability theory. The amplitudes of the receptivity coefficients are found to decrease with the streamwise coordinate
Prospects of Studies in Region of Low-Sized Aircraft (Review)
Authors: Zverkov Ilya , Kryukov Alexey , Grek Genrich
Published: December 2021

In the given review the problem of improvement of aerodynamic characteristics of the low-sized aircraft is considered with point of view of the fundamental phenomena of the mechanics of liquid, gas and plasma. It is a problem of the local boundary layer separation (separated bubbles) and flow separation from a wing forward edge at which all global structure of a flow varies. The review of the works establishing this interrelation and methods of the influence, eliminating harmful consequences of the separations is submitted. The method of separation elimination with help of a wavy surface, as the most perspective and easily sold on practice is in more details allocated in this review. The second part of the review is devoted to the analysis of a flow of elements of designs of various low-sized aircraft with indication of probably problem places where the flow is realized at Reynolds number less than 106 and where can arise the local separations. Application of a wavy surface in such places can improve aerodynamic characteristics of the flying device promoting its more effective operation
Basic Software for NSLS-II Booster Synchrotron Magnetic System Control
Authors: Derbenev Anton , Karnaev Sergey , Makeev Aleksandr , Cheblakov Pavel
Published: December 2021

NSLS-II booster synchrotron magnetic system requires a specific control hardware and software. This article describes the control system as a whole and its concepts of operation. Principles of control were proposed and EPICS-based software was developed, permitting individual independent digital control of each power supply. This design provides precise alteration of power supplies operation in each synchrotron cycle with frequency of 1 or 2 Hz
The Role of Two-Dimensional Roughness Element in the Laminar-Turbulent Process in the Favorable Pressure Gradient of the Swept Wing
Authors: Tolkachev Stepan , Kaprilevskaya Valeria , Kozlov Viktor
Published: December 2021

In the article using a liquid crystal thermography investigated the development of stationary and secondary disturbances, which were excited by cylindrical and two-dimensional roughness elements. It was shown, that two-dimensional roughness element has a destabilizing effect on disturbances, induced by cylindrical roughness element. Also the twodimensional roughness element is able to excite the stationary structures, and then the secondary disturbances the frequency interval of which is lower than in the case of stationary vortices excitation by cylindrical roughness element
Effect Of The Rib Inclination Angle On Liquid Film Spreading Over The Structured Surface
Authors: Pavlenko Aleksandr , Volodin Oleg , Serdyukov Vladimir
Published: December 2021

Results of experimental studies on hydrodynamics of the film flow of liquid nitrogen over the surface of the single elements of structured packing are presented. The effect of inclination angle of the large ribs and perforation on the zones of liquid film spreading over the corrugated surface with microtexture at different Reynolds numbers of the film is shown based on a comparison of experimental data. It is shown that the angle of large rib inclination has a significant influence on redistribution of the local flow rate of liquid flowing on the surface with complex geometry. Analysis of results of the high-speed video revealed that in a vicinity of the vertical lateral edges of corrugated plates, the intense rivulet flows are formed, including those with separation from the film flow surface. This negative factor can lead to significant liquid accumulation and flow near the vertical edges of the structured packing and on the inner wall of the heat exchanging apparatuses and, finally, to a significant increase in the degree of maldistribution of local liquid flow rate over the crosssection, for instance, of the distillation columns.
Investigation Of Anomalies In The Electronic Dispersion Of The Hubbard Model, t–J And t–J* Models Within The Cluster Perturbation Theory In The X-Operator Representation
Authors: Kuz’min Valeriy , Nikolaev Sergey
Published: December 2021

The electronic structure with the spectral line broadening corresponding to the angle-resolved photoemission spectroscopy resolution has been calculated for the Hubbard model, t–J and t–J* models within the norm-conserving cluster perturbation theory. The electronic dispersion anomalies similar to the high-energy kinks observed in the angle-resolved photoemission spectroscopy experiments are obtained at the energy scale of order of the hopping integral t. The doping dependence of the high-energy anomalies for different Coulomb repulsion values is discussed. The influence of the threesite correlated hopping on the results is analyzed.
The Based On Digital Signal Processor Power Source With Reversible Output Synchronous Rectifier
Authors: Senkov Dmitriy , Pureskin Dmitriy , Medvedko Anatoliy
Published: December 2021

There are the structure and control algorithms 10kW power source with 25 kHz converter and output synchronous rectifier shown in the article. The output voltage or current of power source has controlled waveform with 1 kHz maximal frequency. The output voltage is galvanically isolated from mains. The source design allows using the load’s energy recuperation in the power converter storage capacitor and soft switching in the synchronous rectifier. The article shows the application of power source as 400 Hz waveform regulated sinusoidal voltage generator.
Influence Of The Variable Parameters Jet Flowing Through The Slit On The Supersonic Gas Flow In The Expanding Channel
Authors: Zamuraev Vladimir , Kalinina Anna
Published: December 2021

Influence of the jet flowing from a gas generator through a narrow slit on shock-wave structure of a stream in the channel of variable section is investigated. Influence of the size of a jet, density and speed of gas on an entrance, and also influence of oscillations of parameters of a jet is studied. Possibility of management of a supersonic stream of shock-wave structure in the channel with the help pulse and periodic an energy supply before a jet is investigated at negative feedback on pressure.
Regimes Of Bubble Generation In The Flow Of Viscous Liquid
Authors: Vorobyev Maxim , Kashinsky Oleg , Lobanov Pavel , Chinak Aleksandr
Published: December 2021

Data of experimental study of the processes arising at gas injection through a capillary in to the liquid flow are presented. The characteristic modes of gas-liquid bubble mixture formation are investigated. Bubble coalescence near the capillary edge was shown to produce different modes. Glycerol was applied as working liquid. Its heating was made to change physical properties of working liquid.
On Nature Of Osmosis Pressure
Authors: Popov Leonid
Published: December 2021

In scientific and education literature you can find the opinion that osmosis is caused by the pressure of solved molecules. In this paper we present the critic of this conception and the valid physical interpretation of this phenomena.
Application Of Elastic Layers To Register Pressure Field On The Model Surface In Supersonic Flow
Authors: Golubev Maxim , Shmakov Andrey
Published: December 2021

The work presents the results of application of panoramic interferential technique which is based on elastic layers (sensors) usage to obtain pressure distribution on the flat plate having sharp leading edge. Experiments were done in supersonic wind tunnel at Mach number M = 4. Sensitivity and response time are shown to be enough to register pressure pulsation against standing and traveling sensor surface waves. Applying high-frequency image acquiring is demonstrated to make possible to distinguish at visualization images high-speed disturbances propagating in the boundary layer from low-speed surface waves
Experimental Investigation Of Explosive Boiling Organic Liquids By Measuring The Laser Intensity Reflected On Microbubbles
Authors: Kozulin Igor , Kuznetsov Vladimir , Bartkus German
Published: December 2021

In this paper the experimental study was made for explosive boiling of liquids under pulsed heating. Experimentally obtained patterns for explosive boiling of organic liquids (ethylene glycol, octane) with the help of optical method measuring the laser intensity reflected from the microheater surface. A multi-layered thin film heater was used in experiments as microheater manufactured by Hewlett Packard technology, with size 100 × 110 mcm. The data of dynamics boiling shown that high heat flux density provide the conditions for the phase explosion whose properties was studied experimentally, including the history of surface vapor covering, nucleation time and the lifetime of the main bubble.
Formation Two Dimensional Negative Islands At High Rate Cooling Of Ultra-Flat Surface Si(111)
Authors: Sitnikov Sergey , Kosolobov Sergey , Latyshev Aleksandr
Published: December 2021

In situ ultrahigh vacuum reflection electron and ex situ atomic force microscopy have been applied to investigate morphology transformations of the ultra-flat stepped Si(111) surface with wide (20–50 µm in diameter) singular terraces during sublimation and quenching from elevated temperatures. The formation of two dimensional negative (vacancy) islands has been observed on the wide terraces after the quenching from temperatures above 1 200°C. The increasing of the critical terrace size for the two-dimensional negative island nucleation has been explained by the changing of the atomic mechanism of mass transport on silicon surface.
Control Of Processes Of Ignition And Combustion Stabilization In The Supersonic Combustion Chamber
Authors: Vankova Olga , Goldfeld Marat , Fedorova Natalya
Published: December 2021

In the paper, results of mathematical modeling of a flow in the supersonic combustion chamber are presented, which have been performed under the conditions of burning initiation by means of an electronic bunch of high energy on the basis of the offered ignition model. Calculations are carried out on the basis of the Reynolds averaged Navier – Stokes equations supplemented by the k–ω SST turbulence model and detailed chemistry kinetics. As a result of numerical modeling, it has been shown that in a frame of the offered model it is possible to predict the ignition of mixture at low stagnation temperatures. The numerical results confirm the experimental data. It is shown that the choice of the optimum scheme of stabilization and the stabilizer geometry allows one to get the flame propagation over all the channel and to provide the stability of combustion even at high flow Mach numbers. The offered mathematical model has allowed defining the conditions of ignition
Diffraction Of A Plane Monochromatic Wave At The Circular Aperture And Circular Disk
Authors: Zakharov Mikhail
Published: December 2021

In the framework of the scalar theory of diffraction of normally incident plane monochromatic wave, the intensity distribution of the diffraction field along the axis of an annular hole was found. As particular cases, the diffraction at an opaque circular disk of radius R ب λ (λ is the wavelength) and at a circular aperture in an opaque screen was considered. Accounting for the vector nature of the field of electromagnetic waves led to more correct results, including at large angles of diffraction, i.e. at sufficiently small distances from the screen (smaller and of order R), where the scalar theory, as it is known, not applicable.
Numerical Research Of Influence Of Disperse Composition On Characteristics Of Combustion Of Coal-Fired Circulating Fluidized Bed
Authors: Salomatov Vladimir , Gil Andrey , Starchenko Aleksandr , Arkhipov Roman
Published: December 2021

The peculiarity of mathematical modeling of the circulating fluidized bed (CFB) is that the solid phase (fuel and ash particles) is always a polydispersed medium. The paper constructed a mathematical model of gas dynamics, heat and mass transfer and combustion in the furnace volume of CFB steam generator with a highly concentrated content of the dispersed phase in relation to the investigation of processes in aerothermochemical CFB furnace. Taking into account: the turbulent structure of the two-phase flow, radiation heat transfer in a dusty environment, the chemical reaction kinetics of ignition and combustion, the effects of the power and thermal interactions between the particles and the particles with the wall. A model of such an environment has been chosen phenomenological model of interpenetrating continua Rahmatulina HA. The characteristic features of CFB technology are: firstly organized circulation of solid particles; Second, the repeated return unburned coarse fractions in the fluidised bed. As a result, during the low-temperature burn-in CFB increased almost two orders of magnitude compared with torch mode, allowing you to burn the most difficult fuels in the energy sector. Numerical analysis of data showed that the best results on the effects of polydisperse composition for fuel combustion characteristics in CFB process provides a particle size distribution in which a small fraction predominates.
Creating Of Stable Transonic Zone Into Supersonic Flow In Axisymmetrical Channel By The Action Of Jet And Energy Sources
Authors: Zamuraev Vladimir , Kalinina Anna
Published: December 2021

The effect of the jet flowing out from the gas generator through a narrow annular gap, on the shockwave structure of the flow in the axisymmetric channel of variable section is studied. The effect of the gap size is investigated. The possibility to control the shock-wave structure of supersonic flow in the channel and creating of transonic area using pulsed-periodic energy supply and jet is studied.
Features Of Particle Size Measurements In The Nanosilica Hydrosol By The Optical Methods
Authors: Zobov Konstantin , Syzrantsev Vyacheslav , Bardakhanov Sergey
Published: December 2021

The current level of study and application of nanoparticles raises the question of their classification. One of the main parameters in this case is the particle size. However, its measurement on such a small scale is a valuable problem as usual models are not correct. The article presents the results of measurements of the light attenuation in the hydrosols (dispersions of nanoparticles in water). The Rayleigh scattering theory was applied to the experimental data for obtaining the average size of nanoparticles with various specific surfaces. The obtained values were compared with the results of the transmission electron microscopy analysis and with the results of dynamic light scattering measurements. All of measurements variants presented the specified value of medium size. It could be caused by the mechanics characteristics, structure and other properties of nanoparticles related to the surface properties and their production process. The Rayleigh theory gave the undervalued particle size, and dynamic light scattering gave overvalued one in a comparison with the microscopy data. It is shown that the light transmission attenuation strongly depends from the particle size, only for particles bigger than 15 nm. For smaller particles the association was not found. There are two different particle size ranges for dynamic light scattering measurement of different produced particle.
HTTP Packets Filtration Method Based On Post-Analysis Of Requests To Web-Resource
Authors: Budnikov Konstantin , Kurochkin Aleksandr , Lubkov Anatoliy , Yakovlev Aleksandr
Published: December 2021

The paper describes an HTTP-request filtering method at packet level by using post-analysis of the passed request to control access to a web-resource. Unlike methods using preliminary analysis of requests, in this method the request is analyzed not before it is sent to the Internet to the webserver on which the requested resource is placed, but after, at the time while the request over communication lines comes to the web-server, which generates a response, and the response message comes back to the filter. Depending on the check results the response received from the web-server by filter device is passed to the user or locked. The approach of such kind reduces the time to wait for the answer on request to the resource in comparison to methods that use preliminary analysis of the request before it is sent to web-server.
Nuclear Fusion And Solar Energy
Authors: Kotelnikov Igor
Published: December 2021

An attempt is made to critically rethink 66 years in the development agenda of controlled nuclear fusion and on this basis to answer the question: will a thermonuclear reactor be in demand in XXI century. A hypothetical fusion reactor is compared to existing nuclear fission reactor on the energy gained per unit volume of the active core when using either D-T or p-11 B-fuel. Progress in fusion research is opposed to the rapid development of solar energy. It is suggested that humankind will always need a variety of energy resources, so the fusion power plant can be built even with the dominance of solar energy.
Numerical Investigation Of The Evolution Of Disturbances On A Flat Plate In A Hypersonic Flow Of A Mixture Of Vibrationally Excited Gases
Authors: Reshetova Anna , Poplavskaya Tatyana
Published: December 2021

The problem of the evolution of disturbances in a hypersonic viscous shock layer on a plate in the flow of a mixture of vibrationally excited carbon dioxide and nitrogen is considered by solving of the Navier – Stokes equations. Two channels of vibrational relaxation of CO2 molecules in collisions with CO2 and in collisions with N2 were taken into account by using a two-temperature model of relaxation flows in modeling the thermal nonequilibrium. The data on the dynamics of the evolution of disturbances on f flat plate in a wide range of determining parameters (attack angle α = 5÷20°, concentration of CO2 in mixture, braking temperature T0 = 2000÷4000 K) are presented in this paper.
Multimode Pulsations In The Axisymmetric Cavern At Supersonic Flow
Authors: Gubanov Dmitriy , Zapryagaev Valeriy
Published: December 2021

Experimental study results of flow structure and pressure pulsation spectral characteristics of axisymmetric cavern at supersonic flow with Mach number 2 is presented. Multimode pulsation existence is observed. Different modes dominate in different time moments. Maximum of one mode amplitude correspond to minimum value of another. Mode tuning nature is incidental. Time of one mode existence is much more than one of mode oscillation period. It is determine that pulsation mode exist in the form of toroidal and helical disturbances. Numerical calculation results qualitative reproduce multimode fluctuation and corresponded to experimental data
Precision Four-Quadrant Current Source Vch-500-12r For Superconducting Solenoids
Authors: Aktershev Yuriy , Vasichev Sergey , Veremeenko Vladimir
Published: December 2021

A precision controllable bidirectional current source 0-500A for superconducting solenoids used in particle physics experiments has been proposed. This article discusses the operation principle of the designed device including a 40-kHz voltage conversion with subsequent synchronous rectification and an approach to energy recuperation from large inductive loads. It also presents some circuit designs aimed at reducing switching losses and increasing the overall efficiency. Current instability for 8 hours of continuous operation is no more than 0.01 % of the normal current.
Islamic Law Overview on Implementation of Murabahah Bil Wakalah on Multi-Purpose Financing Products
Authors: Mualim  , Agustine Hendra Karunia , Hariyani Annisa
Published: December 2021

This study aims to examine the implementation of Murabahah bil Wakalah on multipurpose financing products in a review of Islamic Law. The research method used in this research is field research (field research). The types and sources of data in this study used primary and secondary data. Data collection techniques through interviews, observation, and documentation. The data obtained in this study are conclusions from various processes in qualitative research. Starting from data collection, selecting appropriate data, presenting data and then concluding.The results of this study are murabahah bil wakalah contracts in multipurpose financing at BPRS HIK Parahyangan, murabahah contracts are carried out simultaneously with wakalah contracts. Where the murabahah contract is carried out at the beginning to determine the selling price, the agreed profit, and the installment period.
Azerbaijan Russia and NATO cooperation in the field of ensuring national security
Authors:   Azerbaijan Higher Military Academy, Huseynov Ramid , Aslanli Asif
Published: December 2021

This article considers issues of ensuring the national security of the Republic of Azerbaijan in foreign policy activities, the military-strategic significance of the country for the world and regional states. The position of Russia in South Caucasus policy, its relationship with Armenia, as well as the reasons for the turn of Azerbaijan to the West and NATO are clarified. Also, the importance of Azerbaijani, Russia and NATO relations, the achievements and prospects for peace and security, the building of the national army and militarypolitical cooperation are examined.
Ecological design of the coast of the Caspian sea at the Baku bay
Authors:   Western Caspian University, Andreyeva Janna , Safronova Lidiya ,   Azerbaijan State University of Economics
Published: December 2021

This article considers the ecological approach in design as one of the directions of the world ecological movement, which allows for a positive impact on the dynamics of the development of the infrastructure of the aquatic environment, flora and fauna of the Caspian Sea, and also expands the possibilities for building a perfect ecosystem at the Baku Bay, including social and cultural factors.
Mediation in Criminal Misdemeanor Cases
Authors: Charkoudian Lorig , Walter Jamie , Harmon-Darrow Caroline , Bernstein Justin
Published: December 2021

Diversion of criminal misdemeanors to mediation by district attorneys has been practiced since the 1970s, but research on its impact on critical outcomes like recidivism is scant and outdated. This quasi-experimental study compares 78 mediated cases from a county that diverts cases to mediation with 128 cases in a similar neighboring county that does not, using phone surveys and case review to ask whether recidivism in mediated cases differs from cases prosecuted or treated as usual over the subsequent year. Controlling for case factors and attitudes toward conflict, a case that is not mediated was five times more likely to result in judicial action, five times more likely to result in jury trial demand, and ten times more likely to result in supervised probation or jail time, and mediated cases were almost five times less likely to return to criminal court in the subsequent year than those that were not mediated.
Perceptions of Image-Based Sexual Abuse Among the American Public
Authors: Call Corey
Published: December 2021

Image-based sexual abuse (IBSA) involves the sharing or distribution of erotic material without the consent of the subject in the material. A common scenario of IBSA revolves around an individual sharing erotic material of their former intimate partner following the dissolution of the relationship in order to humiliate or harass that former partner for a perceived wrongdoing. This scenario has caused IBSA to be referred to as “revenge porn” in the past, but that phrase does not capture the full breadth of IBSA behaviors and motivations. IBSA is a relatively new phenomenon, having emerged in the last decade, and few studies have examined public perceptions of the activity. In the present study, the attitudes of a national sample (_n_ = 1,023) of Americans were examined on IBSA-related issues. Results of this study showed that the general public largely disapproves of IBSA and supports its criminalization; however, the public also attributes blame to the victims of IBSA. Several factors influence these perceptions including sex, race, age, parental status, political orientation, and sexting history.
Recycling of damaged RC frames: Replacing crumbled concrete and installing steel haunches below/above the beam at connections
Authors: Ahmad Naveed , Arifullah  , Ilyas Babar , Hussain Sida
Published: December 2021

Experimental and numerical studies are presented evaluating the efficacy of a recycling technique applied to a 1:3 reduced scale damaged RC frame. The crumbled concrete at the beam-column connections was replaced with new high-strength concrete. Epoxy mortar was applied at the interface to secure bonding between the old and new concrete. Additionally, the connections were provisioned with steel haunches, applied below and above the beams. The retrofitted frame was tested under quasi-static cyclic loads. The lateral resistance-displacement hysteretic response of the tested frame was obtained to quantify hysteretic damping, derive the lateral resistance-displacement capacity curve, and develop performance levels. The technique improved the response of the frame; exhibiting an increase in the lateral stiffness, resistance and post-yield stiffness of the frame in comparison to the undamaged original frame. This good behaviour is attributed to the steel haunches installed at connections. A representative numerical model was calibrated in the finite element program SeismoStruct. A set of spectrum compatible ground motions were input to the numerical model for response history analysis. The story drift demands were computed for both the design basis and maximum considered earthquakes. Moreover, the technique was extended to a five-story frame, which was evaluated through nonlinear static pushover and response history analyses. Overstrength factor WR = 4.0 is proposed to facilitate analysis and preliminary design of steel haunches and anchors for retrofitting the low-/mid-rise RC frames.
The Engineered CRISPR-CAS System is a Beneficial Biological Tool for Detecting and Combating Antibiotic Resistance Microbes
Authors:   Sunil Sarkar Lane, Silchar, Assam, India, Chourasia Jay
Published: December 2021

Nowadays, the quick detection of antibiotic resistance bacteria causes a major problem in the field of the development of new antibiotics against the resistant bacteria. To overcome this problem, genome editing tools like clustered regularly interspaced short palindromic repeats (CRISPR) can be used. The CRISPR-CAS system is useful for targeting and killing antibiotic-resistant bacteria by cleaving resistance genes. It is also used to detect antibioticresistant bacteria. CRISPR is made up of a single guide RNA and the CAS 9 protein. The single guide RNA is used to guide toward the target sequence, and the CAS 9 protein is an enzyme that cuts DNA and is used in conjunction with the guide RNA. This modified sgRNA contains a complementary sequence to that of the target resistance gene and recognizes the target resistance sequence; therefore, it is cleaved by CAS-9 protein, and the removal of the resistance gene turns bacteria into antibiotic-sensitive ones. One of the delivery systems of CRISPR into bacteria is via bacteriophage.
The Impact Digitalization Has on Students’ Behavior on a High-Level Institution as the University of Namibia
Authors:   University of Namibia, Windhoek, Namibia, Shikwambi Johannes Ndeshihala , Angula Nikodemus ,   University of Namibia, Windhoek, Namibia
Published: December 2021

The overall aim of this study was to describe and understand how the impact of digitalization impacts students' behavior on a high-level institution such as the University of Namibia. In order to achieve this aim, the following research questions/and research objectives were formulated. The findings of the study were as follows: About 60% of respondents indicated had benefited from digitalization offered by the University of Namibia. Meaning that students had a positive behavior on the digitalization in their learning environment. But about 5 (25%) and 4 (20%) of the respondents showed their disagreement. 4 (20%) of the respondents were neutral as the opted in the middle of the data collection. Only 2 (10%) of the respondents were in agreement with the digital online platforms that it created a more collaborative lecture room environment at the University of Namibia. With thus, students were unsatisfied with digital online platforms in the lecture room and referred to it of being very inadequate and unreliable. With that mind it is recommended that the digitalization should be updated, restructure and improved by the University for Better Performances and the promotion of learning among the stakeholders.