cometadata/datacite-rtg-text-other-reclassification-records huggingface dataset:
Spin-glass state induced by Mn-doping into a moderate gap layered semiconductor SnSe$_2$
Creators: name: Huang, Hongrui
name: Rahman, Azizur
name: Wang, Jianlin
name: Lu, Yalin
name: Akiyama, Ryota
name: Hasegawa, Shuji
Publisher: name: arXiv
Year: 2021
Subjects: subject: Materials Science (cond-mat.mtrl-sci)
subject: FOS: Physical sciences

description: Various types of magnetism can appear in emerging quantum materials such as van der Waals layered ones. Here, we report the successful doping of manganese atoms into a post-transition metal dichalcogenide semiconductor: SnSe$_2$. We synthesized a single crystal Sn$_{1-x}$Mn$_x$Se$_{2}$ with $\textit{x}$ = 0.04 by the chemical vapor transport (CVT) method and characterized it by x-ray diffraction (XRD) and energy-dispersive x-ray spectroscopy (EDS). The magnetic properties indicated a competition between coexisting ferromagnetic and antiferromagnetic interactions, from the temperature dependence of the magnetization, together with magnetic hysteresis loops. This means that magnetic clusters having ferromagnetic interaction within a cluster form and the short-range antiferromagnetic interaction works between the clusters; a spin-glass state appears below ~ 60 K. Furthermore, we confirmed by $\textit{ab initio}$ calculations that the ferromagnetic interaction comes from the 3$\textit{d}$ electrons of the manganese dopant. Our results offer a new material platform to understand and utilize the magnetism in the van der Waals layered materials.
Two-dimensional incompressible ideal flows in a noncylindrical material domain
Creators: name: Fernandes, Flavia Z.
name: Filho, Milton C. Lopes
Publisher: name: arXiv
Year: 2007
Subjects: subject: Analysis of PDEs (math.AP)
subject: FOS: Mathematics
subject: 35Q35,76B03,35Q30

description: The purpose of this work is to prove existence of a weak solution of the two dimensional incompressible Euler equations on a noncylindrical domain consisting of a smooth, bounded, connected and simply connected domain undergoing a prescribed motion. We prove existence of a weak solution for initial vorticity in $L^p$, for $p>1$. This work complements a similar result by C. He and L. Hsiao, who proved existence assuming that the flow velocity is tangent to the moving boundary, see [JDE v. 163 (2000) 265--291].
description: 16 pages
Η αρχή της μη αυτοενοχοποίησης του κατηγορουμένου
Creators: name: Διαμάντη, Παρασκευή Δημητρίου
Publisher: name: Aristotle University of Thessaloniki
Year: 2020
Subjects: Ποινική Δικονομία
Δικαιώματα του κατηγορουμένου
Η αρχή της μη αυτοενοχοποίησης
Criminal Procedure
Defendant’ s rights
The privilege against self - incrimination

description: Σκοπός της διπλωματικής εργασίας ήταν η αποτύπωση της έννοιας της αρχής της μη αυτοενοχοποίησης και η ανάλυση αυτής. Στο παρόν πόνημα επιχειρήθηκε η προσέγγιση των δικαιωμάτων του κατηγορουμένου και του τρόπου συσχετισμού τους με τον ρυθμιστικό πυρήνα της αρχής της μη αυτοενοχοποίησης, καθώς επίσης ερευνήθηκε η εφαρμογή του δικαιώματος αυτού σε όλα τα στάδια της ποινικής διαδικασίας και άλλοτε και σε διοικητικές διαδικασίες. Ένα ακόμα θέμα που παρουσιάστηκε, αφορούσε τις θέσεις της θεωρίας και νομολογίας για το δικαίωμα αυτό και το εύρος αξιοποίησης αυτού. Στη συνέχεια αναλύθηκαν τα αποτελέσματα της παραβίασης του δικαιώματος αυτού με συνέπεια την πρόκληση της απόλυτης ακυρότητας του άρθρου 171 παρ. 1 στ. δ΄ ΚΠΔ. Ακόμα παρατέθηκαν οι θέσεις της νομολογίας στο ζήτημα των ακυροτήτων και ακολούθως στο ζήτημα των παράνομων αποδεικτικών μέσων. Τέλος αναφέρθηκαν διεξοδικά οι θέσεις του Ευρωπαϊκού Δικαστηρίου Δικαιωμάτων του Ανθρώπου και σε σημαντικές αποφάσεις για την αξία του δικαιώματος της μη αυτοενοχοποίησης και τα έννομα αποτελέσματα που επιφέρει η παραβίαση αυτού
description: The purpose of the thesis was to delineate and analyze the concept of the privilege against self – incrimination. Τhe thesis analysed the defendant's rights and their relevance to the right to self - incrimination, as well as the application of this right in all stages of the criminal procedure and sometimes administrative procedure. Another issue that was presented had to do with the view of theory and jurisprudence on this right and the extent of its use. I then presented the consequences of this right’s violation and more specifically the total invalidity of Article 171 par. 1 of Criminal Procedure Code. I also presented the positions of the jurisprudence on the issue of invalidity and then on the issuee of illegal evidence. Finally, I have referred thoroughly to the European Court of Human Rights' positions and to important decisions for the value of the right to self-incrimination and the legal consequences of its violation
Supplemental Material
Creators: name: Kidder, Katherine
name: Noid, Will
Publisher: name: AIP Publishing
Year: 2024
Subjects: classificationCode: 51
subject: Physical sciences
subject: FOS: Physical sciences

description: This document provides Supplementary Material for the manuscript "Analysis of Mapping Atomic Models to Coarse-grained Resolution" by Katherine M. Kidder and W. G. Noid. Section I describes the inverses and pseudo-inverses of congruent ma- trices. Section II analyzes the Hessian matrix, h, of the linear models considered in the main text. In particular, Section IIC derives the determinant identity presented in Eq. (61) of the main text. Finally, Section III demonstrates that the 2-site rep- resentation, MQ, that maximizes Q aligns nicely with the lowest frequency normal mode of the Gaussian Network model (GNM) for actin.
Local Approximation Schemes for Topology Control
Creators: name: Damian, Mirela
name: Pandit, Saurav
name: Pemmaraju, Sriram
Publisher: name: arXiv
Year: 2008
Subjects: subject: Data Structures and Algorithms (cs.DS)
subject: Computational Complexity (cs.CC)
subject: FOS: Computer and information sciences
subject: C.2.4; F.2.2

description: This paper presents a distributed algorithm on wireless ad-hoc networks that runs in polylogarithmic number of rounds in the size of the network and constructs a linear size, lightweight, (1+ε)-spanner for any given ε> 0. A wireless network is modeled by a d-dimensional α-quasi unit ball graph (α-UBG), which is a higher dimensional generalization of the standard unit disk graph (UDG) model. The d-dimensional α-UBG model goes beyond the unrealistic ``flat world'' assumption of UDGs and also takes into account transmission errors, fading signal strength, and physical obstructions. The main result in the paper is this: for any fixed ε> 0, 0 < α\le 1, and d \ge 2, there is a distributed algorithm running in O(\log n \log^* n) communication rounds on an n-node, d-dimensional α-UBG G that computes a (1+ε)-spanner G' of G with maximum degree Δ(G') = O(1) and total weight w(G') = O(w(MST(G)). This result is motivated by the topology control problem in wireless ad-hoc networks and improves on existing topology control algorithms along several dimensions. The technical contributions of the paper include a new, sequential, greedy algorithm with relaxed edge ordering and lazy updating, and clustering techniques for filtering out unnecessary edges.
description: 11 pages, 6 figures
X(1812) in Quarkonia-Glueball-Hybrid Mixing Scheme
Creators: name: He, Xiao-Gang
name: Li, Xue-Qian
name: Liu, Xiang
name: Zeng, Xiao-Qiang
Publisher: name: arXiv
Year: 2006
Subjects: subject: High Energy Physics - Phenomenology (hep-ph)
subject: FOS: Physical sciences

description: Recently a $J^{PC}=0^{++}$ (X(1812)) state with a mass near the threshold of $ω$ and $ϕ$ has been observed by the BES collaboration in $J/ψ\to γωϕ$ decay. It has been suggested that it is a $I^G = 0^+$ state. If it is true, this state fits in a mixing scheme based on quarkonia, glueball and hybrid (QGH) very nicely where five physical states are predicted. Together with the known $f_0(1370)$, $f_0(1500)$, $f_0(1710)$, and $f_0(1790)$ states, X(1812) completes the five members in this family. Using known experimental data on these particles we determine the ranges of the mixing parameters and predict decay properties for X(1812). We also discuss some features which may be able to distinguish between four-quark and hybrid mixing schemes.
description: 15 pages, 2 figures, 3 tables
Unitarity, ergodicity, and quantum thermodynamics
Creators: name: Brody, Dorje C.
name: Hook, Daniel W.
name: Hughston, Lane P.
Publisher: name: arXiv
Year: 2007
Subjects: subject: Quantum Physics (quant-ph)
subject: High Energy Physics - Theory (hep-th)
subject: FOS: Physical sciences

description: This paper is concerned with the ergodic subspaces of the state spaces of isolated quantum systems. We prove a new ergodic theorem for closed quantum systems which shows that the equilibrium state of the system takes the form of a grand canonical density matrix involving a complete commuting set of observables including the Hamiltonian. The result obtained, which is derived for a generic finite-dimensional quantum system, shows that the equilibrium state arising from unitary evolution is always expressible in the canonical form, without the consideration of a system-bath decomposition.
description: 8 pages
Fault-Tolerant Real-Time Streaming with FEC thanks to Capillary Multi-Path Routing
Creators: name: Gabrielyan, Emin
Publisher: name: arXiv
Year: 2006
Subjects: subject: Networking and Internet Architecture (cs.NI)
subject: Multimedia (cs.MM)
subject: FOS: Computer and information sciences

description: Erasure resilient FEC codes in off-line packetized streaming rely on time diversity. This requires unrestricted buffering time at the receiver. In real-time streaming the playback buffering time must be very short. Path diversity is an orthogonal strategy. However, the large number of long paths increases the number of underlying links and consecutively the overall link failure rate. This may increase the overall requirement in redundant FEC packets for combating the link failures. We introduce the Redundancy Overall Requirement (ROR) metric, a routing coefficient specifying the total number of FEC packets required for compensation of all underlying link failures. We present a capillary routing algorithm for constructing layer by layer steadily diversifying multi-path routing patterns. By measuring the ROR coefficients of a dozen of routing layers on hundreds of network samples, we show that the number of required FEC packets decreases substantially when the path diversity is increased by the capillary routing construction algorithm.
COMPASS Results on Transverse Single-Spin Asymmetries
Creators: name: Martin, Anna
Publisher: name: arXiv
Year: 2007
Subjects: subject: High Energy Physics - Experiment (hep-ex)
subject: FOS: Physical sciences

description: New results on single spin asymmetries of charged hadrons produced in deep-inelastic scattering of muons on a transversely polarised LiD target are presented. The data were taken in the years 2002, 2003 and 2004 with the COMPASS spectrometer using the muon beam of the CERN SPS at 160 GeV/c. Preliminary results are given for the Sivers asymmetry and for all the three ``quark polarimeters'' presently used in COMPASS to measure the transversity distributions. The Collins and the Sivers asymmetries for charged hadrons turn out to be compatible with zero, within the small (~1%) statistical errors, at variance with the results from HERMES on a transversely polarised proton target. Similar results have been obtained for the two hadron asymmetries and for the Lambda polarisation. First attempts to describe the Collins and the Sivers asymmetries measured by COMPASS and HERMES allow to give a consistent picture of these transverse spin effects.
description: To appear in the proceedings of Advanced Studies Institute: Symmetries And Spin (SPIN-Praha-2006), 19-26 Jul 2006, Prague, Czech Republic
Implementation of ACTS into sPHENIX track reconstruction
Creators: name: Osborn, Joseph D.
name: Frawley, Anthony D.
name: Huang, Jin
name: Lee, Sookhyun
name: Da Costa, Hugo Pereira
name: Peters, Michael
name: Pinkenburg, Chris
name: Roland, Christof
name: Yu, Haiwang
Publisher: name: arXiv
Year: 2021
Subjects: subject: Instrumentation and Detectors (physics.ins-det)
subject: High Energy Physics - Experiment (hep-ex)
subject: Nuclear Experiment (nucl-ex)
subject: FOS: Physical sciences

description: sPHENIX is a high energy nuclear physics experiment under construction at the Relativistic Heavy Ion Collider at Brookhaven National Laboratory (BNL). The primary physics goals of sPHENIX are to study the quark-gluon-plasma, as well as the partonic structure of protons and nuclei, by measuring jets, their substructure, and heavy flavor hadrons in $p$$+$$p$, $p$+Au, and Au+Au collisions. sPHENIX will collect approximately 300 PB of data over three run periods, to be analyzed using available computing resources at BNL; thus, performing track reconstruction in a timely manner is a challenge due to the high occupancy of heavy ion collision events. The sPHENIX experiment has recently implemented the A Common Tracking Software (ACTS) track reconstruction toolkit with the goal of reconstructing tracks with high efficiency and within a computational budget of 5 seconds per minimum bias event. This paper reports the performance status of ACTS as the default track fitting tool within sPHENIX, including discussion of the first implementation of a time projection chamber geometry within ACTS.
Unusual field and temperature dependence of Hall effect in graphene
Creators: name: Falkovsky, L. A.
Publisher: name: arXiv
Year: 2006
Subjects: subject: Mesoscale and Nanoscale Physics (cond-mat.mes-hall)
subject: Materials Science (cond-mat.mtrl-sci)
subject: FOS: Physical sciences

description: We calculate the classic Hall conductivity and mobility of the undoped and doped (or in the gate voltage) graphene as a function of temperature, magnetic field, and carrier concentration. Carrier collisions with defects and acoustic phonons are taken into account. The Hall resistivity varies almost linearly with temperature. The magnetic field dependence of resistivity and mobility is anomalous in weak magnetic fields. There is the square root contribution from the field in the resistivity. The Hall mobility diverges logarithmically with the field for low doping.
description: 4 pages, 5 figures, typos corrected
Error mitigation for universal gates on encoded qubits
Creators: name: Piveteau, Christophe
name: Sutter, David
name: Bravyi, Sergey
name: Gambetta, Jay M.
name: Temme, Kristan
Publisher: name: arXiv
Year: 2021
Subjects: subject: Quantum Physics (quant-ph)
subject: FOS: Physical sciences

description: The Eastin-Knill theorem states that no quantum error correcting code can have a universal set of transversal gates. For CSS codes that can implement Clifford gates transversally it suffices to provide one additional non-Clifford gate, such as the T-gate, to achieve universality. Common methods to implement fault-tolerant T-gates like magic state distillation generate a significant hardware overhead that will likely prevent their practical usage in the near-term future. Recently methods have been developed to mitigate the effect of noise in shallow quantum circuits that are not protected by error correction. Error mitigation methods require no additional hardware resources but suffer from a bad asymptotic scaling and apply only to a restricted class of quantum algorithms. In this work, we combine both approaches and show how to implement encoded Clifford+T circuits where Clifford gates are protected from noise by error correction while errors introduced by noisy encoded T-gates are mitigated using the quasi-probability method. As a result, Clifford+T circuits with a number of T-gates inversely proportional to the physical noise rate can be implemented on small error-corrected devices without magic state distillation. We argue that such circuits can be out of reach for state-of-the-art classical simulation algorithms.
description: v2: 11 pages, 7 figures; published version
A secure radio-frequency assistive listening device for hard of hearing people
Creators: name: Chan, Paul S. K.
Publisher: name: University of British Columbia
Year: 2008

description: Assistive listening devices allow hearing impaired listeners to achieve higher comprehension than with hearing aids alone in difficult listening conditions which occurs during business meetings, lectures, and presentations. These devices minimize the acoustic pathway between the speaker and listener by using some form of electromagnetic transmission. A major problem with existing assistive listening devices is that they provide little security for the users, as the signal may be picked up by unauthorized listeners outside the confines of the meeting room or hall. The design, implementation, and testing of a secure radio-frequency assistive listening device are described in this thesis. The device combines digital voice encoding technology with the direct sequence spread spectrum technique to provide a secure digital voice communication channel for hearing impaired people. It is shown that the CCITT 0.722 and the digital voice encoding algorithms are acceptable for hearing impaired listeners. A transmitter and receiver based on the Arlan 650Tm wireless network card is implemented. Digitized speech samples are grouped into packets and transmitted using the TCP/IP protocol. The packet error rates of the device measured under some typical environment are presented. The degradation of intelligibility under packet loss conditions is also presented. It is shown that speech intelligibility decreases as the number of lost speech segments increases and the lost speech segments are replaced by two simple packet loss replacement methods.
Single chip variable rate viterbi decoder of constraint length K = 5
Creators: name: Bonek, Peter
Publisher: name: University of British Columbia
Year: 2009

description: This thesis presents a fully self-testable integrated circuit (IC) variable-rate Viterbi decoder of constraint length K = 5. The chip is designed to decode convolutional codes ranging from rate 7/8 to 1/4, derived from the same rate 1/2 mother code. The architecture of the Viterbi decoder is bit-serial node-parallel. The incoming 8-level quantized channel bits are input in parallel and converted to a serial stream. This reduces the amount of interprocessor wiring area substantially, as there are only single wire connections between the add-compare-select (ACS) units. High decoding speed is still achieved because the ACS operation is carried out concurrentiy in each of the 16 states. For the path memory, the register exchange technique was adopted. To reduce the ICs silicon area, the path memory is full-custom layout. For the trellis interconnections between consecutive memory stages, a novel state relabelling technique is proposed that reduces the interconnect area substantially. The area savings are accomplished by redrawing the trellis as sets of butterflies, A major aspect of this IC is its very cost effective built-in self-test. The stuck-at fault coverage is 99% with an overhead area of only 5%, which should not lower the manufacturing yield significantly, and thus yield significant benefits. A novel test algorithm was developed for the path memory. A specific but easy to generate test pattern is applied to the inputs. A major advantage of this deterministic test over pseudo-random techniques is that the test length is very short and, more importantly, independent of the number of states of the Viterbi decoder. The rest of the circuit is tested by pseudo-random patterns combined with a multiple signature analysis scheme. After finding an appropriate initial state of the test pattern generator, it is possible to check for four identical signatures. Compared to checking only one signature at the end of the test session, checking four identical signatures has the advantage of reducing the probability of error escape, while avoiding complicated signature checking for four different references. Moreover, test time can be reduced as faulty chips can be discarded as soon as a signature does not match the reference. These advantageous features are accomplished with circuit overhead equal to checking only a single signature at the end of the test session. The only cost is a one-time logic simulation performed at design phase.
First Step Towards EXPLAINable DGA Multiclass Classification
Creators: name: Drichel, Arthur
name: Faerber, Nils
name: Meyer, Ulrike
Publisher: name: arXiv
Year: 2021
Subjects: subject: Cryptography and Security (cs.CR)
subject: Machine Learning (cs.LG)
subject: FOS: Computer and information sciences

description: Numerous malware families rely on domain generation algorithms (DGAs) to establish a connection to their command and control (C2) server. Counteracting DGAs, several machine learning classifiers have been proposed enabling the identification of the DGA that generated a specific domain name and thus triggering targeted remediation measures. However, the proposed state-of-the-art classifiers are based on deep learning models. The black box nature of these makes it difficult to evaluate their reasoning. The resulting lack of confidence makes the utilization of such models impracticable. In this paper, we propose EXPLAIN, a feature-based and contextless DGA multiclass classifier. We comparatively evaluate several combinations of feature sets and hyperparameters for our approach against several state-of-the-art classifiers in a unified setting on the same real-world data. Our classifier achieves competitive results, is real-time capable, and its predictions are easier to trace back to features than the predictions made by the DGA multiclass classifiers proposed in related work.
description: Accepted at The 16th International Conference on Availability, Reliability and Security (ARES 2021)
Current-induced noise and damping in non-uniform ferromagnets
Creators: name: Foros, Jorn
name: Brataas, Arne
name: Tserkovnyak, Yaroslav
name: Bauer, Gerrit E. W.
Publisher: name: arXiv
Year: 2008
Subjects: subject: Mesoscale and Nanoscale Physics (cond-mat.mes-hall)
subject: FOS: Physical sciences

description: In the presence of spatial variation of the magnetization direction, electric current noise causes a fluctuating spin-transfer torque that increases the fluctuations of the ferromagnetic order parameter. By the fluctuation-dissipation theorem, the equilibrium fluctuations are related to the magnetization damping, which in non-uniform ferromagnets acquires a nonlocal tensor structure. In biased ferromagnets, shot noise can become the dominant contribution to the magnetization noise at low temperatures. Considering spin spirals as a simple example, we show that the current-induced noise and damping is significant.
description: 5 pages, 1 figure
Velocity Inversion in Nanochannel Flow
Creators: name: Jung, Youngkyun
Publisher: name: arXiv
Year: 2006
Subjects: subject: Statistical Mechanics (cond-mat.stat-mech)
subject: FOS: Physical sciences

description: The nanoscale cylindrical Couette flow is investigated by means of molecular dynamics simulations, in the case where the inner cylinder is rotating whereas the outer cylinder is at rest. We find that the tangential velocity of the low is inverted when the fluid-wall interaction near the outer cylinder is weak and the fluid density is low. The unusual velocity inversion behavior is shown to be strongly related to the degree of the slip between the fluid and the outer cylinder, which is determined by the presence or absence of the layering of the fluid near the outer wall.
description: 4 pages, 7 figures
The penetration of FUV radiation into molecular clouds
Creators: name: Goicoechea, Javier
name: Bourlot, Jacques Le
Publisher: name: arXiv
Year: 2007
Subjects: subject: Astrophysics (astro-ph)
subject: FOS: Physical sciences

description: The solution of the FUV radiative transfer equation can be complicated if the most relevant radiative processes such as dust scattering and gas line absorption are included, and have realistic (non-uniform) properties. We have extended the spherical harmonics method to solve for the FUV radiation field in illuminated clouds taking into account gas absorption and coherent, nonconservative and anisotropic scattering by dust grains. Our formalism allows us to consistently include: (i) varying dust populations and (ii) gas lines in the FUV radiative transfer. The FUV penetration depth rises for increasing dust albedo and anisotropy of the scattered radiation (e.g. when grains grow towards cloud interiors). Illustrative models of illuminated clouds where only the dust populations are varied confirm earlier predictions for the FUV penetration in diffuse clouds (A_V<1). For denser and more embedded sources (A_V>1) we show that the FUV radiation field inside the cloud can differ by orders of magnitude depending on the grain properties. We show that the photochemical and thermal gradients can be very different depending on grain growth. Therefore, the assumption of uniform dust properties and averaged extinction curves can be a crude approximation to determine the resulting scattering properties, prevailing chemistry and atomic/molecular abundances in ISM clouds or protoplanetary disks.
description: Accepted for publication in Astronomy & Astrophysics. Section 2. Astrophysical processes. Version 2: minor language corrections added. Figs. 2, 4 and 8 bitmapped to lower resolution
Scattering of topological kink-antikink states in bilayer graphene structures
Creators: name: Benchtaber, Nassima
name: Sánchez, David
name: Serra, Llorenç
Publisher: name: arXiv
Year: 2021
Subjects: subject: Mesoscale and Nanoscale Physics (cond-mat.mes-hall)
subject: FOS: Physical sciences

description: Gapped bilayer graphene can support the presence of intragap states due to kink gate potentials applied to the graphene layers. Electrons in these states display valley-momentum locking, which makes them attractive for topological valleytronics. Here, we show that kink-antikink local potentials enable modulated scattering of topological currents. We find that the kink-antikink coupling leads to anomalous steps in the junction conductance. Further, when the constriction detaches from the propagating modes, forming a loop, the conductance reveals the system energy spectrum. Remarkably, these kink-antikink devices can also work as valley filters with tiny magnetic fields by tuning a central gate.
description: 10 pages, 10 figures, v3, published version
Density fingerprint of giant vortices in Fermi gases near a Feshbach resonance
Creators: name: Hu, Hui
name: Liu, Xia-Ji
Publisher: name: arXiv
Year: 2006
Subjects: subject: Superconductivity (cond-mat.supr-con)
subject: Strongly Correlated Electrons (cond-mat.str-el)
subject: FOS: Physical sciences

description: The structure of multiply quantized or giant vortex states in atomic Fermi gases across a Feshbach resonance is studied within the context of self-consistent Bogoliubov-de Gennes theory. The particle density profile of vortices with $κ>1$ flux quanta is calculated. Owing to $κ$ discrete branches of vortex core bound states, inside the core the density oscillates as a function of the distance from the vortex line and displays a non-monotoic dependence on the interaction strengths, in marked contrast to the singly quantized case, in which the density depletes monotonically. This feature, never reported so far, can make a direct visualization of the giant vortices in atomic Fermi gases.
description: 4 pages and 5 figures; Published version in PRA
On the possible resolution of the B-meson decay polarization anomaly in R-parity violating SUSY
Creators: name: Faessler, Amand
name: Gutsche, Thomas
name: Helo, J. C.
name: Kovalenko, Sergey
name: Lyubovitskij, Valery E.
Publisher: name: arXiv
Year: 2007
Subjects: subject: High Energy Physics - Phenomenology (hep-ph)
subject: FOS: Physical sciences

description: We examine the possible resolution of the recently observed polarization anomaly in B0(bar{B}0) -> phi K*0(bar{K}*0) decay within R-parity violating (RPV) SUSY. We show that a combination of the superpotential trilinear (RPV)-interactions, with the couplings lambda', and the soft SUSY breaking bilinear RPV, sneutrino-Higgs mixing, proportional to tilde{mu}**2, can potentially generate the effective operators with the chirality structure necessary to account for this anomaly. However, we demonstrate that the existing experimental data on Bs -> mu+ mu- decay lead to stringent upper limits on the Wilson coefficients of these operators, which are about two orders of magnitude below the values required for the resolution of the B-decay polarization anomaly, and, therefore, it can hardly be explained within the RPV SUSY framework. As a byproduct result of our analysis we derive new limits on the products of the soft bilinear and the superpotential trilinear RPV-parameters of the form tilde{mu}**2 * lambda'.
description: 7 pages, 1 figure, accepted for publication in Phys. Rev. D
Superconductors with anomalous Floquet higher-order topology
Creators: name: Vu, DinhDuy
name: Zhang, Rui-Xing
name: Yang, Zhi-Cheng
name: Sarma, Sankar Das
Publisher: name: arXiv
Year: 2021
Subjects: subject: Materials Science (cond-mat.mtrl-sci)
subject: FOS: Physical sciences

description: We develop a general theory for two-dimensional (2D) anomalous Floquet higher-order topological superconductors (AFHOTSC), which are dynamical Majorana-carrying phases of matter with no static counterpart. Despite the triviality of its bulk Floquet bands, an AFHOTSC generically features the simultaneous presence of corner-localized Majorana modes at both zero and $π/T$ quasi-energies, a phenomenon beyond the scope of any static topological band theory. We show that the key to AFHOTSC is its unavoidable singular behavior in the phase spectrum of the bulk time-evolution operator. By mapping such evolution-phase singularities to the stroboscopic boundary signatures, we classify all 2D AFHOTSCs that are protected by a rotation group symmetry in symmetry class D. We further extract a higher-order topological index for unambiguously predicting the presence of Floquet corner Majorana modes, which we confirm numerically. Our theory serves as a milestone towards a dynamical topological theory for Floquet superconducting systems.
description: 6 pages, 4 figures
Distributed Principal Subspace Analysis for Partitioned Big Data: Algorithms, Analysis, and Implementation
Creators: name: Gang, Arpita
name: Xiang, Bingqing
name: Bajwa, Waheed U.
Publisher: name: arXiv
Year: 2021
Subjects: subject: Machine Learning (cs.LG)
subject: Distributed, Parallel, and Cluster Computing (cs.DC)
subject: Signal Processing (eess.SP)
subject: Optimization and Control (math.OC)
subject: FOS: Computer and information sciences
subject: FOS: Electrical engineering, electronic engineering, information engineering
subject: FOS: Mathematics

description: Principal Subspace Analysis (PSA) -- and its sibling, Principal Component Analysis (PCA) -- is one of the most popular approaches for dimensionality reduction in signal processing and machine learning. But centralized PSA/PCA solutions are fast becoming irrelevant in the modern era of big data, in which the number of samples and/or the dimensionality of samples often exceed the storage and/or computational capabilities of individual machines. This has led to the study of distributed PSA/PCA solutions, in which the data are partitioned across multiple machines and an estimate of the principal subspace is obtained through collaboration among the machines. It is in this vein that this paper revisits the problem of distributed PSA/PCA under the general framework of an arbitrarily connected network of machines that lacks a central server. The main contributions of the paper in this regard are threefold. First, two algorithms are proposed in the paper that can be used for distributed PSA/PCA, with one in the case of data partitioned across samples and the other in the case of data partitioned across (raw) features. Second, in the case of sample-wise partitioned data, the proposed algorithm and a variant of it are analyzed, and their convergence to the true subspace at linear rates is established. Third, extensive experiments on both synthetic and real-world data are carried out to validate the usefulness of the proposed algorithms. In particular, in the case of sample-wise partitioned data, an MPI-based distributed implementation is carried out to study the interplay between network topology and communications cost as well as to study the effects of straggler machines on the proposed algorithms.
description: 16 pages; Final accepted version; To appear in IEEE Transactions on Signal and Information Processing Over Networks
Hadronization Approach for a Quark-Gluon Plasma Formed in Relativistic Heavy Ion Collisions
Creators: name: Miao, Hong
name: Gao, Chongshou
name: Zhuang, Pengfei
Publisher: name: arXiv
Year: 2007
Subjects: subject: Nuclear Theory (nucl-th)
subject: High Energy Physics - Phenomenology (hep-ph)
subject: Nuclear Experiment (nucl-ex)
subject: FOS: Physical sciences

description: A transport model is developed to describe hadron emission from a strongly coupled quark-gluon plasma formed in relativistic heavy ion collisions. The quark-gluon plasma is controlled by ideal hydrodynamics, and the hadron motion is characterized by a transport equation with loss and gain terms. The two sets of equations are coupled to each other, and the hadronization hypersurface is determined by both the hydrodynamic evolution and the hadron emission. The model is applied to calculate the transverse momentum distributions of mesons and baryons, and most of the results agree well with the experimental data at RHIC.
description: 16 pages, 24 figures. Version accepted by PRC
Μελέτη βέλτιστων μετρήσεων ηλεκτρικής τομογραφίας με διατάξεις ηλεκτροδίων τοποθετημένων στον τρισδιάστατο χώρο
Creators: name: Λούβαρης, Πρόδρομος Κωνσταντίνου
Publisher: name: Aristotle University of Thessaloniki
Year: 2020
Subjects: Τρισδιάστατη ηλεκτρική τομογραφία
Βελτιστοποίηση πρωτοκόλλων
Τυχαία διαμόρφωση ηλεκτροδίων
3D ERT
Protocol optimization
Random electrode arrangement

description: Στα πλαίσια της παρούσας μεταπτυχιακής διατριβής μελετώνται βέλτιστες διατάξεις μέτρησης ηλεκτρικής τομογραφίας για ηλεκτρόδια των οποίων η θέση τους βρίσκεται σε γνωστές αλλά και σε τυχαίες θέσεις στον τρισδιάστατο χώρο. Η βελτιστοποίηση των πρωτοκόλλων υλοποιείται με τη μέθοδο του πίνακα διακριτικής ικανότητας (Stummer et al. 2004) όπως και με τη μέθοδο του Ιακωβιανού πίνακα (Αθανασίου 2009), ενώ πραγματοποιείται επέκταση των μεθόδων σε χρήση τρισδιάστατων ηλεκτρικών τομογραφιών. Επίσης δημιουργήθηκε αλγόριθμος ο οποίος βελτιστοποιεί πρωτόκολλα μετρήσεων βασισμένος στη μέθοδο του Ιακωβιανού πίνακα, ενώ παράλληλα υιοθετεί το κριτήριο της γραμμικής ανεξαρτησίας από τη μέθοδο του πίνακα διακριτικής ικανότητας. Προκειμένου να ελεγχθούν τόσο οι μέθοδοι βελτιστοποίησης όσο και οι τυχαίες θέσεις των ηλεκτροδίων, πραγματοποιήθηκαν πειράματα τόσο με συνθετικά μοντέλα όσο και με πραγματικές μετρήσεις πεδίου. Τα αποτελέσματα δείχνουν ότι οι μέθοδοι βελτιστοποίησης μπορούν να απεικονίσουν με επιτυχία τους στόχους επιτυγχάνοντας παρόμοια αποτελέσματα με τα πλήρη πρωτόκολλα
description: This master thesis examines the optimized ERT arrays for fixed or arbitrary electrode positions in the three dimensional space. Optimized arrays are calculated using the resolution matrix method (Stummer et al. 2004) and the Jacobian matrix method (Athanasiou 2009) extending the methodology in the three-dimensional (3D) space. Moreover, an optimizing algorithm was developed on the basis of the Jacobian matrix method while simultaneously adopting the linear independence criterion from the resolution matrix method. The effectiveness of the optimization methods in 3D ERTs with electrodes at arbitrary positions was tested using synthetic models and real field data. Results show that optimized protocols can depict the targets quite satisfactorily
On the two-dimensional magnetic reconnection with nonuniform resistivity
Creators: name: Malyshkin, Leonid
name: Kulsrud, Russell M.
Publisher: name: arXiv
Year: 2006
Subjects: subject: Astrophysics (astro-ph)
subject: FOS: Physical sciences

description: In this paper two theoretical approaches for the calculation of the rate of quasi-stationary, two-dimensional magnetic reconnection with nonuniform anomalous resistivity are considered in the framework of incompressible magnetohydrodynamics (MHD). In the first, ``global'' equations approach the MHD equations are approximately solved for a whole reconnection layer, including the upstream and downstream regions and the layer center. In the second, ``local'' equations approach the equations are solved across the reconnection layer, including only the upstream region and the layer center. Both approaches give the same approximate answer for the reconnection rate. Our theoretical model is in agreement with the results of recent simulations of reconnection with spatially nonuniform resistivity by Baty, Priest and Forbes (2006), contrary to their conclusions.
description: 7 pages, 1 figure
Frequency dependent impedance of stranded conductors using the subdivision method
Creators: name: Kashani, Mehrdad M.
Publisher: name: University of British Columbia
Year: 2008

description: Accurate determination of frequency dependent resistance of stranded conductors in transmission lines has not been thoroughly investigated for a wide frequency range of DCto 10 MHz. The main objective of this thesis project has been to write a computer program that calculates the resistance and inductance of stranded conductors in the indicated frequency range. The fundamental idea in the implemented technique is to subdivide the cross section of each strand with circular and straight line segments forming circular and elemental shape subconductors (or elements). Then, assuming uniform current density within each area, resistance, self inductance, and mutual inductances for all subconductors are calculated. The resistances and inductances are placed into a complex impedance matrix which is then reduced through mathematical manipulations to obtain a single complex number that represents the equivalent resistance and inductance of the whole conductor. The advantage of this method is that it automatically considers the skin effect and proximity effect of all of the subconductors in the conductor. Elemental shape subdivisions are more efficient than circular or rectangular shape subdivisions. In addition, the positioning of the elements within each strand is optimized for accuracy and CPU time. The electromagnetic transients program EMTP requires the values of the line parameters in the frequency range of DC to 10 MHz, and it uses the "TUBE" approximation to calculate them. As shown in this thesis, the TUBE approximation does not provide accurate results for resistance of stranded conductors above 5 kHz. The proposed program needs an IBM compatible (80386 or above) personal computer and runs with minimum user intervention. The results obtained in this research with the Subdivision method suggest that the log(R) versus log (frequency) graph can be approximated by a straight line in its high frequency range. Slopes of graphs for conductors with different number of strands have been calculated, and an exponential formula for resistance calculations above 5 kHz is devel-oped. The resistance value at 5 kHz is found by the TUBE formula, and then using the appropriate slope, the resistance of the stranded conductor is estimated at higher frequencies.
Quantum Monte Carlo modelling of the spherically averaged structure factor of a many-electron system
Creators: name: Gaudoin, R.
name: Pitarke, J. M.
Publisher: name: arXiv
Year: 2006
Subjects: subject: Materials Science (cond-mat.mtrl-sci)
subject: FOS: Physical sciences

description: The interaction and exchange-correlation contributions to the ground-state energy of an arbitrary many-electron system can be obtained from a spherical average of the wavevector-dependent diagonal structure factor (SF). We model the continuous-k spherically averaged SF using quantum Monte Carlo calculations in finite simulation cells. We thus derive a method that allows to substantially reduce the troublesome Coulomb finite-size errors that are usually present in ground-state energy calculations. To demonstrate this, we perform variational Monte Carlo calculations of the interaction energy of the homogeneous electron gas. The method is, however, equally applicable to arbitrary inhomogeneous systems.
description: 4 pages, 5 figures
Αγροτική Δημοσιογραφία. Η περίπτωση του διαδικτυακού τόπου Ypaithros.gr
Creators: name: Χρυσοχόου, Αφροδίτη Χρήστου
Publisher: name: Aristotle University of Thessaloniki
Year: 2020
Subjects: Αγροτική δημοσιογραφία
Διαδίκτυο
Ανάλυση Λόγου
Agricultural journalism
Internet
Discourse analysis

description: Σκοπός της παρούσας διατριβής ήταν η μελέτη και η έρευνα ενός ιδιαίτερου πεδίου δημοσιογραφίας που είναι παραγνωρισμένο στη χώρα μας και είναι η αγροτική, όσο και η ανάλυση του λόγου, ως ειδικού παραδείγματος, των χαρακτηριστικών και δομικών γνωρισμάτων που έχει ένα αγροτικό διαδικτυακό Μέσο ενημέρωσης σε επίπεδο περιεχομένου, ύφους, μορφής και λειτουργικότητας. Για τους παραπάνω σκοπούς και για την οργάνωση της μελέτης κρίθηκε απαραίτητη, πρωτίστως, η θεωρητική διερεύνηση εννοιών και προσεγγίσεων και επιχειρήθηκε, στη συνέχεια, η σύνδεση και συσχέτιση της θεωρίας με την εμπειρική εξέταση των ειδησεογραφικών τίτλων και κειμένων που δημοσιεύονται στην ηλεκτρονική σελίδα του αγροτικού διαδικτυακού τόπου
description: The aim of the present thesis was the study and research of a special field of journalism, which is unappreciated in our country and that is agricultural journalism, as well as the speech analysis, as a specific example, of the characteristics and structural features of an online agricultural medium concerning its content, way of expression, form and functionality. First of all, the theoretical investigation of meanings and approaches was deemed necessary for the purposes mentioned above and the organization of this study, and afterward, an attempt to connect and associate the theory with the empirical deliberation of the titles and texts that are released on the website
SIRIS Charter
Creators: name: SIRIS Academic
Publisher: name: Zenodo
Year: 2025

description: SIRIS Academic is a higher education & research consulting company born in 2010, 100% owned by a not-for-profit foundation. 

The company was established in 2010 as a privately-owned company with a clear mission outlined in its statutes: economic profit is a means, not an end. The ultimate goal is to contribute to the development of sound public policies for Higher Education, Research, and Innovation.By 2022, after 12 years of dedicated effort, SIRIS Academic had grown into a thriving organisation with 50 employees, operating across diverse global ecosystems. At this pivotal moment, the three founding partners, inspired by the steward-owned organisation model, chose to donate all their shares to the newly established SIRIS Foundation. The foundation was created to safeguard the company’s original mission and ensure that its value serves a collective purpose rather than an individual one. The SIRIS Foundation now stands as the sole owner of SIRIS Academic.

SIRIS Charter is the official document which defines the relationship, rights, and responsibilities between the SIRIS Foundation and SIRIS Academic. It outlines the governance structure, decision-making processes, and strategic alignment between the Foundation and its subsidiary, ensuring both entities work in harmony towards long-term value creation.
The prolate-to-oblate shape transition of phospholipid vesicles in response to frequency variation of an AC electric field can be explained by the dielectric anisotropy of a phospholipid bilayer
Creators: name: Peterlin, Primoz
name: Svetina, Sasa
name: Zeks, Bostjan
Publisher: name: arXiv
Year: 2006
Subjects: subject: Soft Condensed Matter (cond-mat.soft)
subject: FOS: Physical sciences

description: The external electric field deforms flaccid phospholipid vesicles into spheroidal bodies, with the rotational axis aligned with its direction. Deformation is frequency dependent: in the low frequency range (~ 1 kHz), the deformation is typically prolate, while increasing the frequency to the 10 kHz range changes the deformation to oblate. We attempt to explain this behaviour with a theoretical model, based on the minimization of the total free energy of the vesicle. The energy terms taken into account include the membrane bending energy and the energy of the electric field. The latter is calculated from the electric field via the Maxwell stress tensor, where the membrane is modelled as anisotropic lossy dielectric. Vesicle deformation in response to varying frequency is calculated numerically. Using a series expansion, we also derive a simplified expression for the deformation, which retains the frequency dependence of the exact expression and may provide a better substitute for the series expansion used by Winterhalter and Helfrich, which was found to be valid only in the limit of low frequencies. The model with the anisotropic membrane permittivity imposes two constraints on the values of material constants: tangential component of dielectric permittivity tensor of the phospholipid membrane must exceed its radial component by approximately a factor of 3; and the membrane conductivity has to be relatively high, approximately one tenth of the conductivity of the external aqueous medium.
description: 17 pages, 6 figures; accepted for publication in J. Phys.: Condens. Matter
Golem: An algorithm for robust experiment and process optimization
Creators: name: Aldeghi, Matteo
name: Häse, Florian
name: Hickman, Riley J.
name: Tamblyn, Isaac
name: Aspuru-Guzik, Alán
Publisher: name: arXiv
Year: 2021
Subjects: subject: Optimization and Control (math.OC)
subject: Machine Learning (cs.LG)
subject: Chemical Physics (physics.chem-ph)
subject: FOS: Mathematics
subject: FOS: Computer and information sciences
subject: FOS: Physical sciences

description: Numerous challenges in science and engineering can be framed as optimization tasks, including the maximization of reaction yields, the optimization of molecular and materials properties, and the fine-tuning of automated hardware protocols. Design of experiment and optimization algorithms are often adopted to solve these tasks efficiently. Increasingly, these experiment planning strategies are coupled with automated hardware to enable autonomous experimental platforms. The vast majority of the strategies used, however, do not consider robustness against the variability of experiment and process conditions. In fact, it is generally assumed that these parameters are exact and reproducible. Yet some experiments may have considerable noise associated with some of their conditions, and process parameters optimized under precise control may be applied in the future under variable operating conditions. In either scenario, the optimal solutions found might not be robust against input variability, affecting the reproducibility of results and returning suboptimal performance in practice. Here, we introduce Golem, an algorithm that is agnostic to the choice of experiment planning strategy and that enables robust experiment and process optimization. Golem identifies optimal solutions that are robust to input uncertainty, thus ensuring the reproducible performance of optimized experimental protocols and processes. It can be used to analyze the robustness of past experiments, or to guide experiment planning algorithms toward robust solutions on the fly. We assess the performance and domain of applicability of Golem through extensive benchmark studies and demonstrate its practical relevance by optimizing an analytical chemistry protocol under the presence of significant noise in its experimental conditions.
description: 37 pages, 25 figures; additional experiments, expanded discussions and references
Realistic digital preservation in the near future: How do we get from A to Z when B already seems too far away?
Creators: name: Langley, Somaya
Publisher: name: Apollo - University of Cambridge Repository
Year: 2019
Subjects: mobile
phone
access
preservation
digital preservation
Apple
iOs
iExplorer
DB Browser for SQL Lite

description: Developed as part of the Digital Preservation at Oxford and Cambridge (DPOC), also known as the Polonsky Digital Preservation Project - http://www.dpoc.ac.uk/