cometadata/datacite-rtg-text-other-reclassification-records huggingface dataset:
title: DENTAL STATUS OF ELDERLY PATIENTS WITH HYPOTHYROIDISM
Creators: name: D'yachenko, Svetlana V.
name: Firsova, Irina V.
name: Yakovlev, Anatoliy T.
name: Gavrikova, Lyudmila M.
Publisher: name: Astrakhan State Medical University
Year: 2021

description: Abstract. In the modern world, the proportion of elderly people is steadily growing. As you know, in elderly people, diseases of various systems and organs are much more common. However, the greatest growth in recent years has been seen in diseases of the endocrine system, in particular, pa-thology of the thyroid gland. This work is devoted to the study of dental status in elderly patients with hypothyroidism. The study involved 60 people of both sexes, who were surveyed and instrumental examination of the oral cavity with the definition of various index indicators. As a result, the absolute need for dental treatment of these patients was revealed. The state of oral hygiene is characterized as unsatisfactory. The protective properties of tooth enamel are significantly reduced due to hyposalivation, as well as the lack of bal-ance of macro- and microelements. It has been proven that the pathology of the thyroid gland, in par-ticular its hypofunction, has a significant negative effect on the state of the oral cavity of an elderly person. Therefore, the management of such patients must be carried out under the supervision of an endocrinologist or general practitioner. Determining the correct treatment strategy for elderly patients with hypothyroidism requires further research. Key words: elderly patients, hypothyroidism, dental status, dental health, lesions of dental hard tissues.
Quantum oscillations of photocurrents in HgTe quantum wells with Dirac and parabolic dispersions
Creators: name: Zoth, C.
name: Olbrich, P.
name: Vierling, P.
name: Dantscher, K.-M.
name: Bel'kov, V. V.
name: Semina, M. A.
name: Glazov, M. M.
name: Golub, L. E.
name: Kozlov, D. A.
name: Kvon, Z. D.
name: Mikhailov, N. N.
name: Dvoretsky, S. A.
name: Ganichev, Sergey
Publisher: name: Universität Regensburg
Year: 2014
Subjects: subject: 530 Physik

description: We report on the observation of magneto-oscillations of terahertz radiation induced photocurrent in HgTe/HgCdTe quantum wells of different widths, which are characterized by a Dirac-like, inverted, and normal parabolic band structure. The photocurrent data are accompanied by measurements of photoresistance (photoconductivity), radiation transmission, as well as magnetotransport. We develop a microscopic model of a cyclotron-resonance assisted photogalvanic effect, which describes main experimental findings. We demonstrate that the quantum oscillations of the photocurrent are caused by the crossing of Fermi level by Landau levels resulting in the oscillations of spin polarization and electron mobilities in spin subbands. Theory explains a photocurrent direction reversal with the variation of magnetic field observed in experiment. We describe the photoconductivity oscillations related with the thermal suppression of the Shubnikov–de Haas effect.
Probing topological transitions in HgTe/CdTe quantum wells by magneto-optical measurement
Creators: name: Scharf, Benedikt
name: Matos-Abiague, Alex
name: Zutic, Igor
name: Fabian, Jaroslav
Publisher: name: Universität Regensburg
Year: 2015
Subjects: subject: 530 Physik

description: In two-dimensional topological insulators, such as inverted HgTe/CdTe quantum wells, helical quantum spin Hall (QSH) states persist even at finite magnetic fields below a critical magnetic field Bc, above which only quantum Hall (QH) states can be found. Using linear-response theory, we theoretically investigate the magneto-optical properties of inverted HgTe/CdTe quantum wells, both for infinite two-dimensional and finite-strip geometries and for possible signatures of the transition between the QSH and QH regimes. In the absorption spectrum, several peaks arise due to nonequidistant Landau levels in both regimes. However, in the QSH regime, we find an additional absorption peak at low energies in the finite-strip geometry. This peak arises due to the presence of edge states in this geometry and persists for any Fermi level in the QSH regime, while in the QH regime the peak vanishes if the Fermi level is situated in the bulk gap. Thus, by sweeping the gate voltage, it is possible to experimentally distinguish between the QSH and QH regimes due to this signature. Moreover, we investigate the effect of spin-orbit coupling and finite temperature on this measurement scheme.
Tunneling anomalous and spin Hall effects
Creators: name: Matos-Abiague, Alex
name: Fabian, Jaroslav
Publisher: name: Universität Regensburg
Year: 2015
Subjects: subject: 530 Physik

description: We predict, theoretically, the existence of the anomalous Hall effect when a tunneling current flows through a tunnel junction in which only one of the electrodes is magnetic. The interfacial spin-orbit coupling present in the barrier region induces a spin-dependent momentum filtering in the directions perpendicular to the tunneling current, resulting in a skew tunneling even in the absence of impurities. This produces an anomalous Hall conductance and spin Hall currents in the nonmagnetic electrode when a bias voltage is applied across the tunneling heterojunction. If the barrier is composed of a noncentrosymmetric material, the anomalous Hall conductance and spin Hall currents become anisotropic with respect to both the magnetization and crystallographic directions, allowing us to separate this interfacial phenomenon from the bulk anomalous and spin Hall contributions. The proposed effect should be useful for proving and quantifying the interfacial spin-orbit fields in metallic and metal-semiconductor systems.
On the isomorphism between the reduction algebra and the invariant differential operators on Lie groups
Creators: name: Batakidis, Panagiotis
Publisher: name: arXiv
Year: 2011
Subjects: subject: Quantum Algebra (math.QA)
subject: Representation Theory (math.RT)
subject: FOS: Mathematics
subject: 53D55, 17B37

description: Using techniques of deformation (bi)quantization we establish a non-canonical algebra isomorphism between the deformed reduction algebra and the invariant differential operators on G/H. Further results concerning other deformations of these two algebras are also proved. Part of the author's PhD thesis at University Paris 7, 2009.
description: 27 pages
Die UN-Behindertenrechtskonvention in der Praxis des Ausschusses für die Rechte von Menschen mit Behinderungen
Creators: name: Uerpmann-Wittzack, Robert
Publisher: name: Universität Regensburg
Year: 2016
Subjects: subject: 340 Recht
subject: PR 1075

description: In the space of seven years, the UN Committee on the Rights of Persons with Disabilities (CeeRPD) established under Article 34 of the UN Convention on the Rights of Persons with Disabilities (CRPD) of 13 December 2006 has decided on 13 individual complaints and issued two general comments dealing with equality before the law and accessibility. This paper builds upon this practice in order to analyse general CRPD principles with regard to the notion of disability, equality rights, the progressive realisation of economic and social rights, possible justification of interferences, methods of interpretation, a margin of appreciation accorded to State parties, and the relationship between different rights. The CRPD is a hybrid convention with a holistic ambition, which emphasises equality rights while combining civil and political rights with economic and social rights. The CeeRPD tends to hold CRPD guarantees as being absolute, excluding any negative effects on grounds of disability. Even positive obligations are likely to be construed as obligations of result regardless of limited resources or competing interests. This engaged reading of the CRPD challenges current State practice. It corresponds to the advocatory role of the Committee as a highly qualified expert body for the rights of persons with disabilities.
Magnetoanisotropic Andreev Reflection in Ferromagnet-Superconductor Junctions
Creators: name: Högl, Petra
name: Matos-Abiague, Alex
name: Zutic, Igor
name: Fabian, Jaroslav
Publisher: name: Universität Regensburg
Year: 2015
Subjects: subject: 530 Physik

description: Andreev reflection spectroscopy of ferromagnet-superconductor (FS) junctions is an important probe of spin polarization. We theoretically investigate spin-polarized transport in FS junctions in the presence of Rashba and Dresselhaus interfacial spin-orbit fields and show that Andreev reflection can be controlled by changing the magnetization orientation. We predict a giant in- and out-of-plane magnetoanisotropy of the junction conductance. If the ferromagnet is highly spin polarized—in the half-metal limit—the magnetoanisotropic Andreev reflection depends universally on the spin-orbit fields only. Our results show that Andreev reflection spectroscopy can be used for sensitive probing of interfacial spin-orbit fields in a FS junction.
Non-integrable supersymmetries and their classification for $\mathfrak{gl}(1,1)$ and $\mathfrak{sl}(1,1)$
Creators: name: Kalus, Matthias
Publisher: name: arXiv
Year: 2010
Subjects: subject: Rings and Algebras (math.RA)
subject: Mathematical Physics (math-ph)
subject: FOS: Mathematics
subject: FOS: Physical sciences
subject: 58H15, 17B37

description: Infinitesimal supersymmetries over classical Lie groups that do not necessarily integrate to Lie supergroups are described. They yield a notion of supersymmetry that is less rigid than the assumption of a Lie supergroup action but still implies an underlying action of a Lie group. In contrast to Lie supergroups, the arising representation-theoretical Lie supergroups (RTLSG) occur as families associated to Harish-Chandra superpairs. However morphisms of RTLSGs directly correspond to morphisms of Harish-Chandra superpairs. Particular RTLSGs can be derived from the explicit constructions of Lie supergroups given by Berezin and Kostant. The Lie superalgebras $\mathfrak{gl}(1,1)$ or $\mathfrak{sl}(1,1)$ appearing also in higher dimensional classical Lie superalgebras, provide interesting first examples of RTLSGs. A classification of RTLSGs associated to real and complex $\mathfrak{gl}(1,1)$- and $\mathfrak{sl}(1,1)$-Harish-Chandra superpairs is given by parameter spaces and complete sets of invariants. The underlying Lie group is assumed to be connected but possibly not simply connected.
description: [v2] Classification completed
Classification of non-symplectic automorphisms on K3 surfaces which act trivially on the Néron-Severi lattice
Creators: name: Taki, Shingo
Publisher: name: arXiv
Year: 2010
Subjects: subject: Algebraic Geometry (math.AG)
subject: FOS: Mathematics
subject: 14J28, 14J50

description: We treat non-symplectic automorphisms on $K3$ surfaces which act trivially on the Néron-Severi lattice. In this paper, we classify non-symplectic automorphisms of prime-power order, especially 2-power order on $K3$ surfaces, i.e., we describe their fixed locus.
description: 15 pages
Outer automorphism groups of free groups: linear and free representations
Creators: name: Kielak, Dawid
Publisher: name: arXiv
Year: 2011
Subjects: subject: Group Theory (math.GR)
subject: FOS: Mathematics
subject: 20F65 (Primary), 20F28, 57M60, 20C15 (Secondary)

description: We study the existence of homomorphisms between Out(F_n) and Out(F_m) for n > 5 and m < n(n-1)/2, and conclude that if m is not equal to n then each such homomorphism factors through the finite group of order 2. In particular this provides an answer to a question of Bogopol'skii and Puga. In the course of the argument linear representations of Out(F_n) in dimension less than n(n+1)/2 over fields of characteristic zero are completely classified. It is shown that each such representation has to factor through the natural projection from Out(F_n) to GL(n,Z) coming from the action of Out(F_n) on the abelianisation of F_n. We obtain similar results about linear representation theory of Out(F_4) and Out(F_5).
description: Final version. To appear in JLMS
Universal ultrafast detector for short optical pulses based on graphene
Creators: name: Mittendorff, Martin
name: Kamann, Josef
name: Eroms, Jonathan
name: Weiss, Dieter
name: Drexler, Christoph
name: Ganichev, Sergey
name: Kerbusch, Jochen
name: Erbe, Artur
name: Suess, Ryan J.
name: Murphy, Thomas E.
name: Chatterjee, Sangam
name: Kolata, Kolja
name: Ohser, Joachim
name: Koenig-Otto, Jacob
name: Schneider, Harald
name: Helm, Manfred
name: Winnerl, Stephan
Publisher: name: Universität Regensburg
Year: 2015
Subjects: subject: Detectors; Photodetectors
subject: 530 Physik

description: Graphene has unique optical and electronic properties that make it attractive as an active material for broadband ultrafast detection. We present here a graphene-based detector that shows 40-picosecond electrical rise time over a spectral range that spans nearly three orders of magnitude, from the visible to the far-infrared. The detector employs a large area graphene active region with interdigitated electrodes that are connected to a log-periodic antenna to improve the long-wavelength collection efficiency, and a silicon carbide substrate that is transparent throughout the visible regime. The detector exhibits a noise-equivalent power of approximately 100 µW·Hz–½ and is characterized at wavelengths from 780 nm to 500 µm.
Quantum Mechanical Study on the Adsorption of Drug Gentamicin onto γ-Fe2O3 nanoparticles
Creators: name: Mommahed Heravi, Majid
name: MANSOORINASAB, A.
name: Morsali, Alireza
name: Beyramabadi, S. Ali
Publisher: name: figshare
Year: 2022
Subjects: subject: 30303 Optical Properties of Materials
subject: FOS: Chemical sciences
subject: 30302 Nanochemistry and Supramolecular Chemistry
subject: 30701 Quantum Chemistry
subject: 39904 Organometallic Chemistry
subject: Organic Chemistry
subject: 30502 Natural Products Chemistry
subject: 30599 Organic Chemistry not elsewhere classified
subject: 30205 Non-metal Chemistry
subject: Nuclear Chemistry
subject: 30504 Organic Green Chemistry

description: In this work, using quantum mechanics, the interaction of drug gentamicin with ã-Fe2O3 nanoparticles have been studied. Fe2O3 nanoparticles were modeled using Fe6(OH)18(H2O)6 ring clusters. gentamicin molecule can coordinate to the g-Fe2O3 nanoparticles via its own OH or NH2 groups. All of the calculations have been performed using a hybrid density functional method (B3LYP) in solution phase. Three possible modes of noncovalent interaction of gentamicin onto ã- Fe2O3 nanoparticles were investigated. Quantum molecular descriptors in the drug-nanoparticle systems were studied. It was found that binding of gentamicin with g-Fe2O3 nanoparticles is thermodynamically favorable. Among NCOOH and NCOCl, the first one has more binding energy and can act as a suitable system for drug gentamicin delivery within biological systems (noncovalent). Gentamicin can intract with g-Fe2O3 nanoparticles via OH and NH2 groups which the first one has more binding energy.
Factors effecting primary stability of mini-implants in vitro
Creators: name: Al-Ohali, Hadeel
Publisher: name: University of British Columbia
Year: 2017

description: Objectives: Mini-implants (MIs) are now routinely used in orthodontic treatments; however, compared to conventional implants, MIs suffer higher failure. Achieving primary stability (PS) appears to be the most important factor predicting success of MIs. Factors such as implant diameter, length, and bone quality are known to influence PS in conventional implants; however, little is known of the effects of these factors on PS in MIs. Therefore, the aim of this study was to investigate the effect of MI’s diameter, length and the presence of cortical bone in PS. Methods: AbsoAnchor TAD design from Dentos with 1.5,1.7, and 2mm diameters; 6,8, and 10mm length were placed in Polyurethane bone blocks with densities of cancellous bone (GP- 20). MIs were also placed in blocks were sandwiched with 1 or 2mm polyurethane sheets, which simulated cortical bone density. Four MIs in each group were placed using recommended procedures. PS of MIs was measured with Periotest and Osstell by three testers. The Cronbach Alpha inter-examiners reliability test was used to evaluate agreement among the testers. PS data were analyzed with multifactorial ANOVA to detect the significant influence of each factor in MIs’ PS (a = 0.05). Results: Both Osstell and Periotest indicated significant increase in PS (p<0.05) when cortical bone sheet of 1 or 2 mm thickness were in contact with MIs. MIs’ diameter had significant influence in PS, indicating that MIs with wider diameter (1.7-2 mm) had significantly higher PS (p < 0.05) in both cancellous and cortical sandwiched models. There was no significant difference in PS when different lengths of MIs were used in cortical sandwiched models; however, an increase in MIs’ length appeared to increase PS only in soft bone blocks, which simulated the hardness of the cancellous bone. Conclusions: Important factors in achieving PS in MIs appear to be bone type and implant diameter in heterogeneous bone (combined cancellous & cortical bone) often found in vivo. An increase in the length of the MIs only improves PS in homogeneous soft bone (cancellous bone). Recognizing factors improving PS would expect to decrease unnecessary trauma and failure rate in children and adolescence.
Delay and Redundancy in Lossless Source Coding
Creators: name: Shayevitz, Ofer
name: Meron, Eado
name: Feder, Meir
name: Zamir, Ram
Publisher: name: arXiv
Year: 2010
Subjects: subject: Information Theory (cs.IT)
subject: FOS: Computer and information sciences

description: The penalty incurred by imposing a finite delay constraint in lossless source coding of a memoryless source is investigated. It is well known that for the so-called block-to-variable and variable-to-variable codes, the redundancy decays at best polynomially with the delay, where in this case the delay is identified with the source block length or maximal source phrase length, respectively. In stark contrast, it is shown that for sequential codes (e.g., a delay-limited arithmetic code) the redundancy can be made to decay exponentially with the delay constraint. The corresponding redundancy-delay exponent is shown to be at least as good as the Rényi entropy of order 2 of the source, but (for almost all sources) not better than a quantity depending on the minimal source symbol probability and the alphabet size.
description: IEEE Transactions on Information Theory
Giant photocurrents in a Dirac fermion system at cyclotron resonance
Creators: name: Olbrich, P.
name: Zoth, C.
name: Vierling, P.
name: Dantscher, K.-M.
name: Budkin, G. V.
name: Tarasenko, S. A.
name: Bel'kov, V. V.
name: Kozlov, D. A.
name: Kvon, Z. D.
name: Mikhailov, N. N.
name: Dvoretsky, S. A.
name: Ganichev, Sergey
Publisher: name: Universität Regensburg
Year: 2013
Subjects: subject: 530 Physik

description: We report on the observation of the giant photocurrents in HgTe/HgCdTe quantum well (QW) of critical thickness at which a Dirac spectrum emerges. At an exciting QW of 6.6 nm width by terahertz (THz) radiation and sweeping magnetic field we detected a resonant photocurrent. Remarkably, the position of the resonance can be tuned from negative (−0.4 T) to positive (up to 1.2 T) magnetic fields by means of optical doping. The photocurrent data, accompanied by measurements of radiation transmission as well as Shubnikov–de Haas and quantum Hall effects, prove that the photocurrent is caused by cyclotron resonance in a Dirac fermion system, which allows us to obtain the effective electron velocity v≈7.2×105 m/s. We develop a microscopic theory of the effect and show that the inherent spin-dependent asymmetry of light-matter coupling in the system of Dirac fermions causes the electric current to flow.
Probing the Effects of Lorentz-Symmetry Violating Chern-Simons and Ricci-Cotton Terms in Higher Derivative Gravity
Creators: name: Pereira-Dias, B.
name: Hernaski, C. A.
name: Helayël-Neto, J. A.
Publisher: name: arXiv
Year: 2010
Subjects: subject: High Energy Physics - Theory (hep-th)
subject: General Relativity and Quantum Cosmology (gr-qc)
subject: FOS: Physical sciences

description: The combined effects of the Lorentz-symmetry violating Chern-Simons and Ricci-Cotton actions are investigated for the Einstein-Hilbert gravity in the second order formalism modified by higher derivative terms, and their consequences on the spectrum of excitations are analyzed. We follow the lines of previous works and build up an orthonormal basis of operators that splits the fundamental fields according to their individual degrees of freedom. With this new basis, the attainment of the propagators is remarkably simplified and the identification of the physical and unphysical modes gets a new insight. Our conclusion is that the only tachyon- and ghost-free model is the Einstein-Hilbert action added up by the Chern-Simons term with a time-like vector of the type $v^μ = (μ,\vec{0})$. Spectral consistency imposes taht the Ricci-Cotton term must be switched off. We then infer that gravity with Lorentz-symmetry violation imposes a drastically different constraint on the background if compared to usual gauge theories whenever conditions for suppression of tachyons and ghosts are required.
description: 15 pages. It coincides with the version published in Phys. Rev. D
Algorithm design for optimal power flow, security-constrained unit commitment, and demand response in energy systems
Creators: name: Bahrami, Shahab
Publisher: name: University of British Columbia
Year: 2017

description: Energy management is of prime importance for power system operators to enhance the use of the existing and new facilities, while maintaining a high level of reliability. In this thesis, we develop analytical models and efficient algorithms for energy management programs in transmission and distribution networks. First, we study the optimal power flow (OPF) in ac-dc grids, which is a non-convex optimization problem. We use convex relaxation techniques and transform the problem into a semidefinite program (SDP). We derive the sufficient conditions for zero relaxation gap and design an algorithm to obtain the global optimal solution. Subsequently, we study the security-constrained unit commitment (SCUC) problem in ac-dc grids with generation and load uncertainty. We introduce the concept of conditional value-at risk to limit the net power supply shortage. The SCUC is a nonlinear mixed-integer optimization problem. We use ℓ₁-norm approximation and convex relaxation techniques to transform the problem into an SDP. We develop an algorithm to determine a near-optimal solution. Next, we target the role of end-users in energy management activities. We study demand response programs for residential users and data centers. For residential users, we capture their coupled decision making in a demand response program with real-time pricing as a partially observable stochastic game. To make the problem tractable, we approximate the optimal scheduling policy of the residential users by the Markov perfect equilibrium (MPE) of a fully observable stochastic game with incomplete information. We develop an online load scheduling learning algorithm to determine the users’ MPE policy. Last but not least, we focus on the demand response program for data centers in deregulated electricity markets, where each data center can choose a utility company from multiple available suppliers. We model the data centers’ coupled decisions of utility company choices and workload scheduling as a many-to-one matching game with externalities. We characterize the stable outcome of the game, where no data center has an incentive to unilaterally change its strategy. We develop a distributed algorithm that is guaranteed to converge to a stable outcome.
Uniaxial linear resistivity of superconducting La(1.905)Ba(0.095)CuO(4) induced by an external magnetic field
Creators: name: Wen, Jinsheng
name: Jie, Qing
name: Li, Qiang
name: Huecker, M.
name: Zimmermann, M. v.
name: Han, Su Jung
name: Xu, Zhijun
name: Singh, D. K.
name: Konik, R. M.
name: Zhang, Liyuan
name: Gu, Genda
name: Tranquada, J. M.
Publisher: name: arXiv
Year: 2010
Subjects: subject: Superconductivity (cond-mat.supr-con)
subject: FOS: Physical sciences

description: We present an experimental study of the anisotropic resistivity of superconducting La(2-x)Ba(x)CuO(4) with x=0.095 and transition temperature Tc=32 K. In a magnetic field perpendicular to the CuO(2) layers, H(perp), we observe that the resistivity perpendicular to the layers, ρ(perp), becomes finite at a temperature consistent with previous studies on very similar materials; however, the onset of finite parallel resistivity, ρ(par), occurs at a much higher temperature. This behavior contradicts conventional theory, which predicts that ρ(perp) and ρ(par) should become finite at the same temperature. Voltage vs. current measurements near the threshold of voltage detectability indicate linear behavior perpendicular to the layers, becoming nonlinear at higher currents, while the behavior is nonlinear from the onset parallel to the layers. These results, in the presence of moderate H(perp), appear consistent with superconducting order parallel to the layers with voltage fluctuations between the layers due to thermal noise. In search of uncommon effects that might help to explain this behavior, we have performed diffraction measurements that provide evidence for H(perp)-induced charge and spin stripe order. The field-induced decoupling of superconducting layers is similar to the decoupled phase observed previously in La(2-x)Ba(x)CuO(4) with x=1/8 in zero field.
description: 12 pages, 14 figures, revised and enlarged version, accepted in PRB
Supplementary material from The generalized Wiener–Hopf equations for the elastic wave motion in angular regions
Creators: name: Daniele, Vito G.
name: Lombardi, Guido
Publisher: name: The Royal Society
Year: 2022
Subjects: subject: Mechanics
subject: 10299 Applied Mathematics not elsewhere classified
subject: FOS: Mathematics
subject: 20301 Acoustics and Acoustical Devices; Waves
subject: FOS: Physical sciences

description: In this work, we introduce a general method to deduce spectral functional equations in elasticity and thus, the generalized Wiener–Hopf equations (GWHEs), for the wave motion in angular regions filled by arbitrary linear homogeneous media and illuminated by sources localized at infinity. The work extends the methodology used in electromagnetic applications and proposes for the first time a complete theory to get the GWHEs in elasticity. In particular, we introduce a vector differential equation of first-order characterized by a matrix that depends on the medium filling the angular region. The functional equations are easily obtained by a projection of the reciprocal vectors of this matrix on the elastic field present on the faces of the angular region. The application of the boundary conditions to the functional equations yields GWHEs for practical problems. This paper extends and applies the general theory to the challenging canonical problem of elastic scattering in angular regions.
title: Дни науки и инноваций НовГУ: материалы XXVIII научной конеренции преподавателей, аспирантов и студентов НовГУ
Creators: name: Новгородский государственный университет имени Ярослава Мудрого
Publisher: name: Новгородский государственный университет имени Ярослава Мудрого (НовГУ)
Year: 2021

description: Часть 2 сборника включает 56 статей по медицинским, биологическим, сельскохозяйственным и техническим наукам, авторы которых явились победителями в секционных заседаниях традиционной научной конференции в НовГУ.
Предназначено для студентов, аспирантов, молодых исследователей и всех интересующихся актуальными достижениями в области медицины, биологии, экологии и природопользования, сельского хозяйства и электроники.
Facial-Liveliness-Verification for Monocular Real-Time-Systems
Creators: name: Hassani, Ali
Publisher: name: My University
Year: 2022
Subjects: subject: Face recognition
subject: Face liveliness
subject: Forensics
subject: Deepfake
subject: Real-time systems
subject: Electrical, Electronics, and Computer Engineering

description: Face-recognition is becoming the go-to authentication method. It is convenient: simply look at the camera for instant recognition. Attackers, however, can expose vulnerabilities by “replaying” an enrolled user. The primary concern here is the physical-spoof-attack. Attackers can acquire a representative image from social media and create a realistic looking facsimile (e.g., paper-mask) for authentication. This attack is rather popular for its efficacy and simplicity; despite this, there are few reliable monocular detection methods. Alternatively, attackers can tamper the camera stream by placing an injection device. The face-swap-attack similarly presents an acquired image of the victim, this time as a photo-realistic image alteration using machine-learning. This attack is new and does not yet have a computationally efficient means of detection. The goal of this dissertation is to address both problems in a fashion that is monocular, single-frame and computationally efficient. A series of four physics-informed facial-liveliness-verification frameworks are presented to achieve these goals. Performance evaluation shows best-in-class accuracy where all algorithms are optimized for real-time-systems. These results are discussed and concluded with proposed future works.
All-optical evaluation of spin-orbit interaction based on diffusive spin motion in a two-dimensional electron gas
Creators: name: Kohda, M.
name: Altmann, P.
name: Schuh, Dieter
name: Ganichev, Sergey
name: Wegscheider, Werner
name: Salis, G.
Publisher: name: Universität Regensburg
Year: 2015
Subjects: subject: 530 Physik

description: A method is presented that enables the measurement of spin-orbit coefficients in a diffusive two-dimensional electron gas without the need for processing the sample structure, applying electrical currents or resolving the spatial pattern of the spin mode. It is based on the dependence of the average electron velocity on the spatial distance between local excitation and detection of spin polarization, resulting in a variation of spin precession frequency that in an external magnetic field is linear in the spatial separation. By scanning the relative positions of the exciting and probing spots in a time-resolved Kerr rotation microscope, frequency gradients along the [100] and [010] crystal axes of GaAs/AlGaAs QWs are measured to obtain the Rashba and Dresselhaus spin-orbit coefficients, α and β. This simple method can be applied in a variety of materials with electron diffusion for evaluating spin-orbit coefficients.
Almost complex structures on real Lie supergroups
Creators: name: Kalus, Matthias
Publisher: name: arXiv
Year: 2010
Subjects: subject: Complex Variables (math.CV)
subject: FOS: Mathematics
subject: 32C11, 58A50

description: A complex Lie supergroup can be described as a real Lie supergroup with integrable almost complex structure. The necessary and sufficient conditions on an almost complex structure on a real Lie supergroup for defining a complex Lie supergroup are deduced. The classification of real Lie supergroups with such almost complex structures yields a new approach to the known classification of complex Lie supergroups by complex Harish-Chandra superpairs. A universal complexification of a real Lie supergroup is constructed.
description: This is a condensed version of the previous file with additional remarks
A Goal-Directed Implementation of Query Answering for Hybrid MKNF Knowledge Bases
Creators: name: Gomes, Ana Sofia
name: Alferes, Jose Julio
name: Swift, Terrance
Publisher: name: arXiv
Year: 2011
Subjects: subject: Artificial Intelligence (cs.AI)
subject: FOS: Computer and information sciences

description: Ontologies and rules are usually loosely coupled in knowledge representation formalisms. In fact, ontologies use open-world reasoning while the leading semantics for rules use non-monotonic, closed-world reasoning. One exception is the tightly-coupled framework of Minimal Knowledge and Negation as Failure (MKNF), which allows statements about individuals to be jointly derived via entailment from an ontology and inferences from rules. Nonetheless, the practical usefulness of MKNF has not always been clear, although recent work has formalized a general resolution-based method for querying MKNF when rules are taken to have the well-founded semantics, and the ontology is modeled by a general oracle. That work leaves open what algorithms should be used to relate the entailments of the ontology and the inferences of rules. In this paper we provide such algorithms, and describe the implementation of a query-driven system, CDF-Rules, for hybrid knowledge bases combining both (non-monotonic) rules under the well-founded semantics and a (monotonic) ontology, represented by a CDF Type-1 (ALQ) theory. To appear in Theory and Practice of Logic Programming (TPLP)
Graphene on transition-metal dichalcogenides: A platform for proximity spin-orbit physics and optospintronics
Creators: name: Gmitra, Martin
name: Fabian, Jaroslav
Publisher: name: Universität Regensburg
Year: 2015
Subjects: subject: 530 Physik

description: Hybrids of graphene and two-dimensional transition-metal dichalcogenides (TMDCs) have the potential to bring graphene spintronics to the next level. As we show here by performing first-principles calculations of graphene on monolayer MoS2, there are several advantages of such hybrids over pristine graphene. First, Dirac electrons in graphene exhibit a giant global proximity spin-orbit coupling, without compromising the semimetallic character of the whole system at zero field. Remarkably, these spin-orbit effects can be very accurately described by a simple effective Hamiltonian. Second, the Fermi level can be tuned by a transverse electric field to cross the MoS2 conduction band, creating a system of coupled massive and massless electron gases. Both charge and spin transport in such systems should be unique. Finally, we propose to use graphene/TMDC structures as a platform for optospintronics, in particular, for optical spin injection into graphene and for studying spin transfer between TMDCs and graphene.
Supplementary Material from The generalized Wiener–Hopf equations for the elastic wave motion in angular regions
Creators: name: Daniele, Vito G.
name: Lombardi, Guido
Publisher: name: The Royal Society
Year: 2022
Subjects: subject: Mechanics
subject: 10299 Applied Mathematics not elsewhere classified
subject: FOS: Mathematics
subject: 20301 Acoustics and Acoustical Devices; Waves
subject: FOS: Physical sciences

description: In this work, we introduce a general method to deduce spectral functional equations in elasticity and thus, the generalized Wiener–Hopf equations (GWHEs), for the wave motion in angular regions filled by arbitrary linear homogeneous media and illuminated by sources localized at infinity. The work extends the methodology used in electromagnetic applications and proposes for the first time a complete theory to get the GWHEs in elasticity. In particular, we introduce a vector differential equation of first-order characterized by a matrix that depends on the medium filling the angular region. The functional equations are easily obtained by a projection of the reciprocal vectors of this matrix on the elastic field present on the faces of the angular region. The application of the boundary conditions to the functional equations yields GWHEs for practical problems. This paper extends and applies the general theory to the challenging canonical problem of elastic scattering in angular regions.
Datenqualität als Erfolgsfaktor im Business Analytics
Creators: name: Heinrich, Bernd
name: Klier, Mathias
Publisher: name: Universität Regensburg
Year: 2016
Subjects: subject: Assessment, Business Analytics, Currency, Data Quality, Metric
subject: 330 Wirtschaft

description: “Garbage In, Garbage Out“ – this especially holds true for the fields of Business Analytics and data-driven decision support. Against this background, in this article we propose a probabilitybased metric to assess the currency of data. We demonstrate the application of the metric as well as its practical benefit using the case of a major German car manufacturer.
A SURVEY OF WIRELESS NETWORK SECURITY AMONG TERTIARY INSTITUTION IN NIGERIA: A CASE OF STUDY WAZIRI UMARU FEDERAL POLYTECHNIC BIRNIN KEBBI
Creators: name: Umar, Zayyanu
Publisher: name: figshare
Year: 2022
Subjects: subject: 80503 Networking and Communications
subject: FOS: Computer and information sciences

description: This paperinvestigates wireless network security
in Waziri Umaru Federal Polytechnic Birnin Kebbi as well as the devices used to monitor and secure the
wireless network. The data for thestudy were produced through theoral interview. From the study, the
researcher finds out that Waziri Umaru Federal Polytechnic Birnin Kebbi uses Cacti and Nagios as
wireless auditing tools which were originally developed to be used for helping the network administrators
to monitor their systems securely. The study also highlighted the security goalthat can assure the
secrecy of any network which includes: Authentication, Confidentiality, Integrity, Non-Repudiation,and
Reliability.The study further investigates some security threatsfacing wireless network security in Waziri
Umaru Federal Polytechnic Birnin Kebbi and proposes some measures that can be taken to minimize
the security threats.
Level Sets of the Takagi Function: Local Level Sets
Creators: name: Lagarias, Jeffrey C.
name: Maddock, Zachary
Publisher: name: arXiv
Year: 2010
Subjects: subject: Classical Analysis and ODEs (math.CA)
subject: FOS: Mathematics
subject: 26A45, 26A27, 26A30, 28A25

description: The Takagi function τ: [0, 1] \to [0, 1] is a continuous non-differentiable function constructed by Takagi in 1903. The level sets L(y) = {x : τ(x) = y} of the Takagi function τ(x) are studied by introducing a notion of local level set into which level sets are partitioned. Local level sets are simple to analyze, reducing questions to understanding the relation of level sets to local level sets, which is more complicated. It is known that for a "generic" full Lebesgue measure set of ordinates y, the level sets are finite sets. Here it is shown for a "generic" full Lebesgue measure set of abscissas x, the level set L(τ(x)) is uncountable. An interesting singular monotone function is constructed, associated to local level sets, and is used to show the expected number of local level sets at a random level y is exactly 3/2.
description: 32 pages, 2 figures, 1 table. Latest version has updated equation numbering. The final publication will soon be available at springerlink.com
Efficient and accurate treatment of weak pairs in local CCSD(T) calculations
Creators: name: Masur, Oliver
name: Usvyat, Denis
name: Schütz, Martin
Publisher: name: Universität Regensburg
Year: 2013
Subjects: subject: 540 Chemie

description: Local coupled cluster theory is based on (i) a restriction of the list of pairs (or triples) of occupied molecular orbitals, and (ii) a truncation of the virtual space to orbital pair (or triple) specific subspaces. The latter is motivated by an exponential decay of the contributions to the pair energy with respect to the distance between related local occupied and virtual orbitals; the former only by a polynomial R −6 decay with respect to the distance R between the two occupied orbitals of the pair. Consequently, the restriction of the pair list is more critical, and contributions of pairs should not be neglected unless the corresponding interorbital distance is really large. In local coupled cluster theory pairs are usually discriminated on the basis of the interorbital distance, or the size of the 2nd order Møller-Plesset perturbation theory (MP2) estimate of the pair energy. Only strong pairs are treated at the full coupled cluster level, while weak pairs are treated just at the level of MP2. Yet MP2 might be problematic in certain cases, for example, π-stacking is badly described by MP2, etc. We propose to substitute the MP2 treatment of weak pairs by an approach based on ring-CCD by including third-order diagrams with R −6 decay behavior. Such an approach is clearly superior; it provides higher accuracy, while the computational cost is not significantly higher than that of a MP2 based treatment of weak pairs.
Nonlinear spin control by terahertz-driven anisotropy fields
Creators: name: Baierl, Sebastian
name: Hohenleutner, Matthias
name: Kampfrath, T.
name: Zvezdin, A. K.
name: Kimel, A. V.
name: Huber, Rupert
name: Mikhaylovskiy, R. V.
Publisher: name: Universität Regensburg
Year: 2016
Subjects: subject: 530 Physik

description: Future information technologies, such as ultrafast data recording, quantum computation or spintronics, call for ever faster spin control by light1, 2, 3, 4, 5, 6, 7, 8, 9, 10, 11, 12, 13, 14, 15, 16. Intense terahertz pulses can couple to spins on the intrinsic energy scale of magnetic excitations5, 11. Here, we explore a novel electric dipole-mediated mechanism of nonlinear terahertz-spin coupling that is much stronger than linear Zeeman coupling to the terahertz magnetic field5, 10. Using the prototypical antiferromagnet thulium orthoferrite (TmFeO3), we demonstrate that resonant terahertz pumping of electronic orbital transitions modifies the magnetic anisotropy for ordered Fe3+ spins and triggers large-amplitude coherent spin oscillations. This mechanism is inherently nonlinear, it can be tailored by spectral shaping of the terahertz waveforms and its efficiency outperforms the Zeeman torque by an order of magnitude. Because orbital states govern the magnetic anisotropy in all transition-metal oxides, the demonstrated control scheme is expected to be applicable to many magnetic materials.
Quantum mechanical study on the noncovalent adsorption of drug gentamicin onto pristine and COOH functionalized carbon nanotubes
Creators: name: Mommahed Heravi, Majid
name: .Mansoorinasab, A
name: .Morsali, A
name: Beyramabadi, S. Ali
Publisher: name: figshare
Year: 2022
Subjects: subject: 30303 Optical Properties of Materials
subject: FOS: Chemical sciences
subject: 30302 Nanochemistry and Supramolecular Chemistry
subject: 30701 Quantum Chemistry
subject: 39904 Organometallic Chemistry
subject: Organic Chemistry
subject: 30502 Natural Products Chemistry
subject: 30599 Organic Chemistry not elsewhere classified
subject: 30205 Non-metal Chemistry
subject: Nuclear Chemistry
subject: 30504 Organic Green Chemistry
subject: 30503 Organic Chemical Synthesis

description: In this work, using quantum mechanics, the interaction of drug gentamicin with (5,5) pristine and COOH functionalized single wall carbon nanotubes (SWNT) have been studied. All of the calculations have been performed using a hybrid density functional method (B3LYP) in gas and solution phases. Five and two possible modes of noncovalent interaction of gentamicin onto pristine and COOH functionalized SWNT were investigated, respectively. Quantum molecular descriptors and frontier orbital analysis in the drug-nanotube systems were studied. It was found that binding of gentamicin with pristine (GEN/NT) in gas phase and COOH functionalized (GEN/NTCOOH) carbon nanotubes in both phases is thermodynamically favorable. The solvation energies show that the solubility of GEN/NTCOOH is higher than GEN/NT. Our calculations demonstrated that COOH functionalized carbon nanotubes can act as a suitable system for drug gentamicin delivery within biological systems.
title: Дни науки и инноваций НовГУ : материалы XXVIII научной конференции преподавателей, аспирантов и студентов НовГУ
Creators: name: Новгородский государственный университет имени Ярослава Мудрого (НовГУ)
Publisher: name: Новгородский государственный университет имени Ярослава Мудрого (НовГУ)
Year: 2021

description: Часть 1 сборника включает 75 статей по филологии, медиа, лингвистике, истории, философии, педагогике, психологии, экономике, управлению и праву, авторы которых явились победителями в секционных заседаниях традиционной научной конференции в НовГУ.
Предназначено для студентов, аспирантов, молодых исследователей и всех интересующихся достижениями социально-гуманитарного знания в Новгородском регионе.
Perception of motion in virtual reality interception tasks
Creators: name: Rolin, Robert Adam
Publisher: name: University of British Columbia
Year: 2017

description: Virtual Reality (VR) and related 3D display technologies have recently experienced tremendous growth in promise and popularity, but have significant limitations. Human vision, carefully tuned to integrating multiple cues from the real words can incorrectly perceive the virtual world in these displays. In this thesis, we conduct a series of psychophysics experiments evaluating motion perception in VR, culminating in a user-adapted method to increase interception accuracy of virtual objects by modifying motion-in-depth cues. Using a baseball hitting simulation in VR, we show that our modified motion-in-depth cues result in greater accuracy. Finally, we present implementations of 3D gaze analysis algorithms.
Exploring the singlet scalar dark matter from direct detections and neutrino signals via its annihilation in the Sun
Creators: name: Guo, Wan-Lei
name: Wu, Yue-Liang
Publisher: name: arXiv
Year: 2011
Subjects: subject: High Energy Physics - Phenomenology (hep-ph)
subject: Cosmology and Nongalactic Astrophysics (astro-ph.CO)
subject: FOS: Physical sciences

description: We explore the singlet scalar dark matter (DM) from direct detections and high energy neutrino signals generated by the solar DM annihilation. Two singlet scalar DM models are discussed, one is the real singlet scalar DM model as the simple extension of the standard model (SSDM-SM) with a discrete Z_2 symmetry, and another is the complex singlet scalar DM model as the simple extension of the left-right symmetric two Higgs bidoublet model (SSDM-2HBDM) with $P$ and CP symmetries. To derive the Sun capture rate, we consider the uncertainties in the hadronic matrix elements and calculate the spin-independent DM-nucleon elastic scattering cross section. We find that the predicted neutrino induced upgoing muon fluxes in the region 3.7 GeV < m_D < 4.2 GeV slightly exceed the Super-Kamiokande limit in the SSDM-SM. However, this exceeded region can be excluded by the current DM direct detection experiments. For the SSDM-2HBDM, one may adjust the Yukawa couplings to avoid the direct detection limits and enhance the predicted muon fluxes. For the allowed parameter space of the SSDM-SM and SSDM-2HBDM, the produced muon fluxes in the Super-Kamiokande and muon event rates in the IceCube are less than the experiment upper bound and atmosphere background, respectively.
description: 21 pages, 5 figures, 1 table. Accepted for publication in Nuclear Physics B
สัญญาจัดซื้อจัดจ้างและสัญญาอื่น ๆ (ส่วนที่ 1)
Creators: name: ธนิษฐ์นันท์ ภักดีธรรมะสกุล
Publisher: name: สำนักวิชานิติศาสตร์ มหาวิทยาลัยแม่ฟ้าหลวง
Year: 2563
Subjects: กฎหมายจัดซื้อจัดจ้างภาครัฐ
สัมปทาน

description: วารสารนิติศาสตร์ มหาวิทยาลัยแม่ฟ้าหลวง, 3, 1, 109-134