Extended Gaussian ensemble or q-statistics in hadronic production processes?

The extended Gaussian ensemble introduced recently as a generalization of the canonical ensemble, which allows to treat energy fluctuations present in the system, is used to analyze the inelasticity distributions in high energy multiparticle production processes.Comment: Presented at NEXT2005 (News, Expectations and Trends in Statistical Physics, NEXT-SigmaPhi 3rd International Conference) 13-18 August 2005, Kolymbari CRETE, minor corrections, to be published in Europ. Phys. J. B (2006

Electronic Structure of Three-Dimensional Superlattices Subject to Tilted Magnetic Fields

Full quantum-mechanical description of electrons moving in 3D structures with unidirectional periodic modulation subject to tilted magnetic fields requires an extensive numerical calculation. To understand magneto-oscillations in such systems it is in many cases sufficient to use the quasi-classical approach, in which the zero-magnetic-field Fermi surface is considered as a magnetic-field-independent rigid body in k-space and periods of oscillations are related to extremal cross-sections of the Fermi surface cut by planes perpendicular to the magnetic-field direction. We point out cases where the quasi-classical treatment fails and propose a simple tight-binding fully-quantum-mechanical model of the superlattice electronic structure.Comment: 8 pages, 7 figures, RevTex, submitted to Phys. Rev.

The Bose-Einstein distribution functions and the multiparticle production at high energies

The evolution properties of propagating particles produced at high energies in a randomly distributed environment are studied. The finite size of the phase space of the multiparticle production region as well as the chaoticity can be derived.Comment: 18 pages, LaTeX, no figures, no table

MODERN METHODS AND TECHNOLOGIES IN TEACHING OF FOREIGN LANGUAGES IN HIGHER TECHNICAL UNIVERSITIES

Вопрос эффективного усвоения иностранного языка требует прежде всего усовершенствования методик обучения. В статье рассмотрена важность использования интерактивных технологий и инновационных методов обучения иностранным языкам в высших технических вузах. Опираясь на исследования научной литературы и собственные наблюдения и опыт, осуществлен комплексный анализ новейших современных методов – залога повышения качества изучения иностранных языков в высших учебных заведениях. Рассмотрены роль и значение информационных технологий, а также обоснована эффективность и целесообразность внедрения их в учебный процесс и практическая реализация на занятиях иностранного языка. Освещен чрезвычайно актуальный вопрос выбора эффективных методов обучения, которые могут обеспечить мотивацию изучения иностранного языка, повысить активность студентов и определить ее направленность. Этот вопрос остается актуальным на любом этапе изучения иностранного языка. Доказано, что использование информационно-коммуникационных технологий способствует развитию у студентов навыков самостоятельной и групповой работы над учебным материалом и с первоисточниками, презентации видеопроектов, эффективного аудирования и т. п. При этом, используя новейшие методы обучения, преподаватель объединяет как коммуникативные, так и познавательные цели.Ключевые слова: инновационные технологии и методы обучения, интерактивные методики, коммуникативный и конструктивистский методы, традиционные и альтернтивные методы, игровые и неигровые методы, информационно-коммуникационные технологии.Питання ефективного засвоєння іноземних мов вимагає передусім вдосконалення методик навчання. У статті висвітлено важливість використання інтерактивних технологій та інноваційних методів у процесі викладання іноземних мов у технічних ВНЗ. Спираючись на дослідження наукової літератури та власні спостереження й досвід, здійснено комплексний аналіз новітніх сучасних методик як основи підвищення якості вивчення іноземних мов у вищих навчальних закладах. Розглянуто роль і значення інформаційних технологій, а також обґрунтовано ефективність і доцільність впровадження їх у навчальний процес та практичну реалізацію на заняттях з іноземної мови. Розглянуто надзвичайно актуальне питання вибору найефективніших методів навчання, які можуть забезпечити мотивацію вивчення іноземної мови, підвищити активність студентів і визначити її направленість. Це питання є актуальним на будь-якому етапі вивчення іноземної мови. Доведено, що використання інформаційно-комунікаційних технологій сприяє розвитку у студентів навичок самостійної і групової роботи над навчальним матеріалом та з першоджерелами, презентації відеопроектів, ефективного аудіювання тощо. При цьому, використовуючи новітні методи навчання, викладач поєднує як комунікативні, так і пізнавальні цілі.Ключові слова: інноваційні технології та методи навчання, інтерактивні методики, комунікативний та конструктивістський методи, традиційні та альтернативні методи, ігрові та неігрові методи, інформаційно-комунікаційні технології.Effective foreign language teaching requires enhanced language training methods. The article is devoted to the analysis of modern innovative methodics – the key to improving the quality of foreign language teaching in higher technical universities. The article highlights the actual issue of using innovative approaches and interactive technologies of teaching foreign languages in technical universities. The article tackles opportunities and advantages of innovative pedagogical methods, their introduction into educational processand practical realizatіon at foreign language lessons. The special emphasis is laid on the information technologies and their role in the educational process. This article deals with the importance of innovative methods and interactive technologies and also focuses on the basic theoretical analysis of the Ukrainian and foreign research works and own observations.Тhe article deals with the methods raising student’s motivation in foreign language studying, which consists of wishes to study, to be successful in his or her activity, to be sure in future career. In order to reach this goal the teacher must use innovative methods combining communicative and cognitive aim.Keywords: innovative technologies and methods of education, interactive methods, communicative and constructivist methods, traditional and alternative methods, gaming and non-gaming methods, informative and communicative technologies

The Fractal Properties of the Source and BEC

Using simple space-time implementation of the random cascade model we investigate numerically influence of the possible fractal structure of the emitting source on Bose-Einstein correlations between identical particles. The results are then discussed in terms of the non-extensive Tsallis statistics.Comment: LaTeX file and 2 PS files with figures, 8 pages altogether. Talk presented at the 12th Indian Summer School "Relativistic Heavy Ion Physics, Prague, Czech Republic, 30 August-3 Sept. 1999; to be published in Czech J. Phys. (1999). Some typos correcte

Possible Verification of Tilted Anisotropic Dirac Cone in \alpha-(BEDT-TTF)_2 I_3 Using Interlayer Magnetoresistance

It is proposed that the presence of a tilted and anisotropic Dirac cone can be verified using the interlayer magnetoresistance in the layered Dirac fermion system, which is realized in quasi-two-dimensional organic compound \alpha-(BEDT-TTF)_2 I_3. Theoretical formula is derived using the analytic Landau level wave functions and assuming local tunneling of electrons. It is shown that the resistivity takes the maximum in the direction of the tilt if anisotropy of the Fermi velocity of the Dirac cone is small. The procedure is described to determine the parameters of the tilt and anisotropy.Comment: 4 pages, 4 figures, corrected Fig.

Phenolic-rich extracts from avocado fruit residues as functional food ingredients with antioxidant and antiproliferative properties

In this study, the total phenolic compounds content and profile, the nutritional value, the antioxidant and antiproliferative activities of avocado peel, seed coat, and seed extracts were characterized. Additionally, an in-silico analysis was performed to identify the phenolic compounds with the highest intestinal absorption and Caco-2 permeability. The avocado peel extract possessed the highest content of phenolic compounds (309.95 ± 25.33 mMol GA/100 g of extract) and the lowest effective concentration (EC50) against DPPH and ABTS radicals (72.64 ± 10.70 and 181.68 ± 18.47, respectively). On the other hand, the peel and seed coat extracts had the lowest energy densities (226.06 ± 0.06 kcal/100g and 219.62 ± 0.49 kcal/100g, respectively). Regarding the antiproliferative activity, the avocado peel extract (180 ± 40 µg/mL) showed the lowest inhibitory concentration (IC50), followed by the seed (200 ± 21 µg/mL) and seed coat (340 ± 32 µg/mL) extracts. The IC50 of the extracts induced apoptosis in Caco-2 cells at the early and late stages. According to the in-silico analysis, these results could be related to the higher Caco-2 permeability to hy-droxysalidroside, salidroside, sakuranetin, and luteolin. Therefore, this study provides new insights regarding the potential use of these extracts as functional ingredients with antioxidant and antiproliferative properties and as medicinal agents in diseases related to oxidative stress such as cancer. © 2021 by the authors. Licensee MDPI, Basel, Switzerland

Stochastic Process Associated with Traveling Wave Solutions of the Sine-Gordon Equation

Stochastic processes associated with traveling wave solutions of the sine-Gordon equation are presented. The structure of the forward Kolmogorov equation as a conservation law is essential in the construction and so is the traveling wave structure. The derived stochastic processes are analyzed numerically. An interpretation of the behaviors of the stochastic processes is given in terms of the equation of motion.Comment: 12 pages, 9 figures; corrected typo

Highly anisotropic interlayer magnetoresistance in ZrSiS nodal-line Dirac semimetal

We instigate the angle-dependent magnetoresistance (AMR) of the layered nodal-line Dirac semimetal ZrSiS for the in-plane and out-of-plane current directions. This material has recently revealed an intriguing butterfly-shaped in-plane AMR that is not well understood. Our measurements of the polar out-of-plane AMR show a surprisingly different response with a pronounced cusp-like feature. The maximum of the cusp-like anisotropy is reached when the magnetic field is oriented in the $a$-$b$ plane. Moreover, the AMR for the azimuthal out-of-plane current direction exhibits a very strong four-fold $a$-$b$ plane anisotropy. Combining the Fermi surfaces calculated from first principles with the Boltzmann's semiclassical transport theory we reproduce and explain all the prominent features of the unusual behavior of the in-plane and out-of-plane AMR. We are also able to clarify the origin of the strong non-saturating transverse magnetoresistance as an effect of imperfect charge-carrier compensation and open orbits. Finally, by combining our theoretical model and experimental data we estimate the average relaxation time of $2.6\times10^{-14}$~s and the mean free path of $15$~nm at 1.8~K in our samples of ZrSiS.Comment: 8 pages, 4 figure

Spin-density-wave instabilities in the organic conductor (TMTSF)_2ClO_4: Role of anion ordering

We study the spin-density-wave instabilities in the quasi-one-dimensional conductor (TMTSF)_2ClO_4. The orientational order of the anions ClO_4 doubles the unit cell and leads to the presence of two electrnic bands at the Fermi level. From the Ginzburg-Landau expansion of the free energy, we determine the low-temperature phase diagram as a function of the strength of the Coulomb potential due to the anions. Upon increasing the anion potential, we first find a SDW phase corresponding to an interband pairing. This SDW phase is rapidly supressed, the metallic phase being then stable down to zero temperature. The SDW instability is restored when the anion potential becomes of the order of the hopping amplitude. The metal-SDW transition corresponds to an intraband pairing which leaves half of the Fermi surface metallic. At lower temperature, a second transition, corresponding to the other intraband pairing, takes place and opens a gap on the whole Fermi surface. We discuss the consequences of our results for the experimental phase diagram of (TMTSF)_2ClO_4 at high magnetic field.Comment: 13 pages, 10 figures, Version 2 with minor correction