cometadata/datacite-rtg-text-other-reclassification-records huggingface dataset:
Dynamical quantum ergodicity from energy level statistics
Creators: name: Vikram, Amit
name: Galitski, Victor
Publisher: name: arXiv
Year: 2022
Subjects: subject: Quantum Physics (quant-ph)
subject: Statistical Mechanics (cond-mat.stat-mech)
subject: Mathematical Physics (math-ph)
subject: Chaotic Dynamics (nlin.CD)
subject: FOS: Physical sciences

description: Ergodic theory provides a rigorous mathematical description of chaos in classical dynamical systems, including a formal definition of the ergodic hierarchy. How ergodic dynamics is reflected in the energy levels and eigenstates of a quantum system is the central question of quantum chaos, but a rigorous quantum notion of ergodicity remains elusive. Closely related to the classical ergodic hierarchy is a less-known notion of cyclic approximate periodic transformations [see, e.g., I. Cornfield, S. Fomin, and Y. Sinai, Ergodic Theory (Springer-Verlag New York, 1982)], which maps any "ergodic" dynamical system to a cyclic permutation on a circle and arguably represents the most elementary form of ergodicity. This paper shows that cyclic ergodicity generalizes to quantum dynamical systems, and provides a rigorous observable-independent definition of quantum ergodicity. It implies the ability to construct an orthonormal basis, where quantum dynamics transports any initial basis vector to have a sufficiently large overlap with each of the other basis vectors in a cyclic sequence. It is proven that the basis, maximizing the overlap over all such quantum cyclic permutations, is obtained via the discrete Fourier transform of the energy eigenstates. This relates quantum cyclic ergodicity to energy level statistics. The level statistics of Wigner-Dyson random matrices, usually associated with quantum chaos on empirical grounds, is derived as a special case of this general relation. To demonstrate generality, we prove that irrational flows on a 2D torus are classical and quantum cyclic ergodic, with spectral rigidity distinct from Wigner-Dyson. Finally, we motivate a quantum ergodic hierarchy of operators and discuss connections to eigenstate thermalization. This work provides a general framework for transplanting some rigorous concepts of ergodic theory to quantum dynamical systems.
description: 46+11 pages (single-column), 9+1 figures; v3: expanded introduction with more background and a qualitative summary, slightly extended definitions and some additional explanations. Close to published version
Feasibility of access EGI resources through the ESCAPE developed ESFRI Science Analysis Platform
Creators: name: Giuliano, Taffoni
name: Sara, Bertocco
name: Manuel, Parra-Royón
name: Dave, Morris
name: Klaas, Kliffen
name: Franco, Tinarelli
name: Matteo, Stagni
name: Vincenzo, Galluzzi
name: Francesco, Bedosti
name: Marco, Molinaro
name: John, Swinbank
name: Susana, Sanchez Exposito
Publisher: name: Zenodo
Year: 2023

description: Poster presented at EGI Conference 2022
Crack initiation at V-notch tip under in-plane mixed mode loading: a review of the fictitious notch rounding concept
Creators: name: Filippo, Berto
Publisher: name: Физическая мезомеханика
Year: 2015
Subjects: ЗАКРУГЛЕНИЕ ФИКТИВНОЙ ТРЕЩИНЫ
НАГРУЖЕНИЕ СМЕШАННОГО ТИПА
V-ОБРАЗНЫЙ НАДРЕЗ С ОТВЕРСТИЕМ У КОРНЯ
МИКРОСТРУКТУРНОЕ НАГРУЖЕНИЕ
FICTITIOUS NOTCH ROUNDING
MIXED MODE LOADING
V-NOTCHES WITH ROOT HOLE
MICROSTRUCTURAL SUPPORT

description: The fictitious notch rounding concept has been recently applied for the first time to V-notches with root hole subjected to in-plane mixed mode loading. Out-of-bisector crack propagation is taken into account. The fictitious notch radius is determined as a function of the real notch radius (the microstructural support length) and the notch opening angle. Due to the complexity of the problem, a method based on the simple normal stress failure criterion has been used. It is combined with the maximum tangential stress criterion to determine the crack propagation angle. An analytical method based on Neuber’s procedure has been developed. The method provides the values of the microstructural support factor as a function of the mode ratio and the notch opening angle. The support factor is considered to be independent of the microstructural support length. Finally, for comparison, the support factor is determined on a purely numerical basis by iterative analysis of finite element models. The present paper is aimed to give a brief overview of the recent findings on this challenging topic making clear the state of the art.
Feasibility of access EGI resources through the ESCAPE developed ESFRI Science Analysis Platform
Creators: name: Giuliano, Taffoni
name: Sara, Bertocco
name: Manuel, Parra-Royón
name: Dave, Morris
name: Klaas, Kliffen
name: Franco, Tinarelli
name: Matteo, Stagni
name: Vincenzo, Galluzzi
name: Francesco, Bedosti
name: Marco, Molinaro
name: John, Swinbank
name: Susana, Sanchez Exposito
Publisher: name: Zenodo
Year: 2023

description: Poster presented at ADASS XXXII
Parabolic frequency monotonicity on Ricci flow and Ricci-harmonic flow with bounded curvatures
Creators: name: Li, Chuanhuan
name: Li, Yi
name: Xu, Kairui
Publisher: name: arXiv
Year: 2022
Subjects: subject: Differential Geometry (math.DG)
subject: FOS: Mathematics

description: In this paper, we study the monotonicity of parabolic frequency motivated by \cite{frequency on RF} under the Ricci flow and the Ricci-harmonic flow on manifolds. Here we consider two cases: one is the monotonicity of parabolic frequency for the solution of linear heat equation with bounded Bakry-Émery Ricci curvature, and another case is the monotonicity of parabolic frequency for the solution of heat equation with bounded Ricci curvature.
description: 16 pages
Dilaton field and cosmic wave propagation
Creators: name: Ni, Wei-Tou
Publisher: name: arXiv
Year: 2014
Subjects: subject: General Relativity and Quantum Cosmology (gr-qc)
subject: Cosmology and Nongalactic Astrophysics (astro-ph.CO)
subject: High Energy Physics - Phenomenology (hep-ph)
subject: Optics (physics.optics)
subject: FOS: Physical sciences

description: We study the electromagnetic wave propagation in the joint dilaton field and axion field. Dilaton field induces amplification/attenuation in the propagation while axion field induces polarization rotation. The amplification/attenuation induced by dilaton is independent of the frequency (energy) and the polarization of electromagnetic waves (photons). From observations, the agreement with and the precise calibration of the cosmic microwave background (CMB) to blackbody radiation constrains the fractional change of dilaton |Δψ|/ψ to less than about 8 x 10^(-4) since the time of the last scattering surface of the CMB.
description: 16 pages, Physics Letters A in press
Brittle fracture of rounded V-notches in isostatic graphite under static multiaxial loading
Creators: name: Filippo, Berto
name: Campagnolo Alberto
name: Ayatollahi Majid, R.
Publisher: name: Физическая мезомеханика
Year: 2015
Subjects: МНОГООСНОЕ НАГРУЖЕНИЕ
MULTIAXIAL LOADING
ИЗОСТАТИЧЕСКИЙ ПОЛИКРИСТАЛЛИЧЕСКИЙ ГРАФИТ
ISOSTATIC POLYCRYSTALLINE GRAPHITE
V-ОБРАЗНЫЙ НАДРЕЗ
ПЛОТНОСТЬ ЭНЕРГИИ ДЕФОРМАЦИИ
STRAIN ENERGY DENSITY
КОНТРОЛЬНЫЙ ОБЪЕМ
CONTROL VOLUME
V-NOTCH

description: While a large bulk of experimental results from cracked specimens of polycrystalline graphite under pure modes of loading, in particular under mode I loading, can be found in the literature, only a very limited number of tests have been carried out on notches. At the best of the author knowledge dealing with the specific case of V-notches under mixed mode loading (tension + torsion) no results can be found in the literature. With the aim to fill this lack, the problem of mixed mode (I + III) brittle fracture of polycrystalline graphite is investigated systematically here for the first time. The present study considers cylindrical specimens weakened by circumferential notches characterized by different acuities. A new complete set of experimental data is provided considering different geometrical configurations by varying the notch opening angle and the notch tip radius. The multiaxial static tests have been performed considering different values of the mode mixity ratio (i.e. the ratio between the nominal stress due to tension and that due to torsion loading). A criterion based on the local strain energy density previously applied by the same authors only to pure modes of loading is extended here to the case of tension and torsion loadings applied in combination. The proposed criterion allows a sound assessment of the fracture loads.
Generalized cell structures
Creators: name: Hernández-Dávila, Ana
name: Itzá-Ortiz, Benjamín A.
name: Leonel-Gómez, Rocío
Publisher: name: arXiv
Year: 2021
Subjects: subject: General Topology (math.GN)
subject: FOS: Mathematics
subject: 54F65 (Primary) 54E15, 54B35 (Secondary)

description: Cell structures were introduced by W. Debski and E. Tymchatyn as a way to study some classes of topological spaces and their continuous functions by means of discrete approximations. In this work we weaken the notion of cell structure and prove that the resulting class of topological space admitting such a generalized cell structure includes non-regular spaces.
description: 17 pages
blob loss: instance imbalance aware loss functions for semantic segmentation
Creators: name: Kofler, Florian
name: Shit, Suprosanna
name: Ezhov, Ivan
name: Fidon, Lucas
name: Horvath, Izabela
name: Al-Maskari, Rami
name: Li, Hongwei
name: Bhatia, Harsharan
name: Loehr, Timo
name: Piraud, Marie
name: Erturk, Ali
name: Kirschke, Jan
name: Peeken, Jan C.
name: Vercauteren, Tom
name: Zimmer, Claus
name: Wiestler, Benedikt
name: Menze, Bjoern
Publisher: name: arXiv
Year: 2022
Subjects: subject: Computer Vision and Pattern Recognition (cs.CV)
subject: Machine Learning (cs.LG)
subject: Image and Video Processing (eess.IV)
subject: FOS: Computer and information sciences
subject: FOS: Electrical engineering, electronic engineering, information engineering

description: Deep convolutional neural networks (CNN) have proven to be remarkably effective in semantic segmentation tasks. Most popular loss functions were introduced targeting improved volumetric scores, such as the Dice coefficient (DSC). By design, DSC can tackle class imbalance, however, it does not recognize instance imbalance within a class. As a result, a large foreground instance can dominate minor instances and still produce a satisfactory DSC. Nevertheless, detecting tiny instances is crucial for many applications, such as disease monitoring. For example, it is imperative to locate and surveil small-scale lesions in the follow-up of multiple sclerosis patients. We propose a novel family of loss functions, \emph{blob loss}, primarily aimed at maximizing instance-level detection metrics, such as F1 score and sensitivity. \emph{Blob loss} is designed for semantic segmentation problems where detecting multiple instances matters. We extensively evaluate a DSC-based \emph{blob loss} in five complex 3D semantic segmentation tasks featuring pronounced instance heterogeneity in terms of texture and morphology. Compared to soft Dice loss, we achieve 5% improvement for MS lesions, 3% improvement for liver tumor, and an average 2% improvement for microscopy segmentation tasks considering F1 score.
description: 23 pages, 7 figures // corrected one mistake where it said beta instead of alpha in the text
Quantum Gauge Field Theory in Cohesive Homotopy Type Theory
Creators: name: Schreiber, Urs
name: Shulman, Michael
Publisher: name: arXiv
Year: 2014
Subjects: subject: Mathematical Physics (math-ph)
subject: Logic in Computer Science (cs.LO)
subject: Category Theory (math.CT)
subject: FOS: Physical sciences
subject: FOS: Computer and information sciences
subject: FOS: Mathematics

description: We implement in the formal language of homotopy type theory a new set of axioms called cohesion. Then we indicate how the resulting cohesive homotopy type theory naturally serves as a formal foundation for central concepts in quantum gauge field theory. This is a brief survey of work by the authors developed in detail elsewhere.
description: In Proceedings QPL 2012, arXiv:1407.8427
Some considerations on the J-integral under elastic-plastic conditions for materials obeying a Ramberg-Osgood law
Creators: name: Pasquale, Gallo
name: Filippo, Berto
Publisher: name: Физическая мезомеханика
Year: 2015
Subjects: J-ИНТЕГРАЛ
ТРЕЩИНА
CRACK
УПРУГОПЛАСТИЧЕСКОЕ ПОВЕДЕНИЕ
ELASTIC-PLASTIC BEHAVIOUR
ЗАКОН РАМБЕРГА-ОСГУДА
RAMBERG-OSGOOD LAW
СТЕПЕННОЙ ЗАКОН
POWER LAW
/-INTEGRAL

description: Among the approaches available for structural analysis, the /-integral has received an excellent feedback as a fracture parameter under elastic-plastic conditions. In the literature and dealing with the crack case, it is proposed to evaluate the /-integral as a sum of elastic and plastic contributions. However, some uncertainties arise when applying this method to a Ramberg-Osgood law, especially under large scale yielding conditions. The aim of the present paper is to discuss how the /-integral evaluation can be performed for elastic-plastic cracked components. Two different non-linear behaviours have been considered for the material: the Ramberg-Osgood law and power law. Numerical and finite element results from different approaches have been accurately compared, proving that the most appropriate way to evaluate the /-integral for a material obeying Ramberg-Osgood law is to perform two finite element analyses evaluating separately the elastic contribution (through a linear elastic analysis) and the plastic contribution (through a nonlinear analysis considering power law behaviour).
Detecting anomalous quartic gauge couplings using the isolation forest machine learning algorithm
Creators: name: Jiang, Li
name: Guo, Yu-Chen
name: Yang, Ji-Chong
Publisher: name: arXiv
Year: 2021
Subjects: subject: High Energy Physics - Phenomenology (hep-ph)
subject: FOS: Physical sciences

description: The search of new physics~(NP) beyond the Standard Model is one of the most important tasks of high energy physics. A common characteristic of the NP signals is that they are usually few and kinematically different. We use a model independent strategy to study the phenomenology of NP by directly picking out and studying the kinematically unusual events. For this purpose, the isolation forest~(IF) algorithm is applied, which is found to be efficient in identifying the signal events of the anomalous quartic gauge couplings~(aQGCs). The IF algorithm can also be used to constraint the coefficients of aQGCs. As a machine learning algorithm, the IF algorithm shows a good prospect in the future studies of NP.
description: 19 pages, 10 figures
Fracture assessment of notched bainitic functionally graded steels under mixed mode (i + II) loading
Creators: name: Salavati Hadi
name: Alizadeh Yoness
name: Filippo, Berto
Publisher: name: Физическая мезомеханика
Year: 2015
Subjects: ФУНКЦИОНАЛЬНО-ГРАДИЕНТНАЯ СТАЛЬ
FUNCTIONALLY GRADED STEEL
ПЛОТНОСТЬ ЭНЕРГИИ ДЕФОРМАЦИИ
STRAIN ENERGY DENSITY
КРИТИЧЕСКАЯ РАЗРУШАЮЩАЯ НАГРУЗКА
CRITICAL FRACTURE LOAD
РАДИУС НАДРЕЗА
NOTCH RADIUS
ГЛУБИНА НАДРЕЗА
NOTCH DEPTH
УГОЛ РАСКРЫТИЯ НАДРЕЗА
NOTCH OPENING ANGLE

description: The averaged value of the strain-energy density over a well-defined volume is one of the powerful criteria to assess the static strength of Uand V-notched specimens. This contribution is the first to investigate the effect of notch parameters (notch radius, notch depth and notch opening angle) for fracture assessment of specimens weakened by blunt V-notches made of bainitic functionally graded steels under mixed mode loading (I + II). A numerical method has been used to evaluate the boundary of the control volume, the mean value of the strain-energy density and the critical fracture load. Different values of the notch radius (0.5, 1.0, 1.5 and 2.0 mm), notch depth (5.5, 6.0 and 6.5 mm), notch opening angle (30°, 60° and 90°) and distance of the applied load from the notch bisector line (5 and 10 mm) have been considered. Moreover, this contribution shows that the mean value of the strain-energy density over the control volume can also be accurately determined from a coarse mesh for functionally graded steels.
Observation of a multitude of correlated states at the surface of bulk 1T-TaSe$_2$ crystals
Creators: name: Chen, Yi
name: Ruan, Wei
name: Cain, Jeffrey D.
name: Lee, Ryan L.
name: Kahn, Salman
name: Jia, Caihong
name: Zettl, Alex
name: Crommie, Michael F.
Publisher: name: arXiv
Year: 2022
Subjects: subject: Strongly Correlated Electrons (cond-mat.str-el)
subject: Materials Science (cond-mat.mtrl-sci)
subject: FOS: Physical sciences

description: The interplay between electron-electron interactions and structural ordering can yield exceptionally rich correlated electronic phases. We have used scanning tunneling microscopy to investigate bulk 1T-TaSe2 and have uncovered surprisingly diverse correlated surface states thereof. These surface states exhibit the same in-plane charge density wave ordering but dramatically different electronic ground states ranging from insulating to metallic. The insulating variety of surface state shows signatures of a decoupled surface Mott layer. The metallic surface states, on the other hand, exhibit zero-bias peaks of varying strength that suggest Kondo phases arising from coupling between the Mott surface layer and the metallic bulk of 1T-TaSe2. The surface of bulk 1T-TaSe2 thus constitutes a rare realization of the periodic Anderson model covering a wide parameter regime, thereby providing a model system for accessing different correlated phenomena in the same crystal. Our results highlight the central role played by strong correlations in this material family.
Mode i fracture analysis of polymethylmetacrylate using modified energy-based models
Creators: name: Ayatollahi Majid, R.
name: Razavi S.M.J.
name: Rashidi Moghaddam Morteza
name: Filippo, Berto
Publisher: name: Физическая мезомеханика
Year: 2015
Subjects: МОДИФИЦИРОВАННЫЕ ЭНЕРГЕТИЧЕСКИЕ КРИТЕРИИ
MODIFIED ENERGY-BASED CRITERIA
Т-НАПРЯЖЕНИЕ
T-STRESS
ХРУПКОЕ РАЗРУШЕНИЕ
BRITTLE FRACTURE
ЗОНА ПРОЦЕССА
PROCESS ZONE
ТРАЕКТОРИЯ ТРЕЩИНЫ
CRACK TRAJECTORY

description: The paper presents two energy-based approaches to predict the fracture trajectory and the fracture load in components containing a mode I crack. The fracture behavior of polymethylmetacrylate (PMMA) samples was investigated experimentally and theoretically for compact tension and double cantilever beam test specimens. The crack growth trajectories and the values of apparent fracture resistance in these two specimens were considerably different although both were under pure mode I loading. Two energy-based methods, i.e., the strain energy density and the averaged strain energy density criteria were modified to estimate the fracture trajectory and the fracture load in brittle materials respectively by considering the T-stress effects. The difference between the crack trajectories and the fracture resistances of different cracked specimens of the same material (PMMA) was found to be related to the magnitude and the sign of T-stress.
The Chow rings of the moduli spaces of curves of genus 7, 8, and 9
Creators: name: Canning, Samir
name: Larson, Hannah
Publisher: name: arXiv
Year: 2021
Subjects: subject: Algebraic Geometry (math.AG)
subject: FOS: Mathematics
subject: 14H10, 14C15, 14C17

description: The rational Chow ring of the moduli space $\mathcal{M}_g$ of curves of genus $g$ is known for $g \leq 6$. Here, we determine the rational Chow rings of $\mathcal{M}_7, \mathcal{M}_8,$ and $\mathcal{M}_9$ by showing they are tautological. One key ingredient is intersection theory on Hurwitz spaces of degree $4$ and $5$ covers of $\mathbb{P}^1$, as developed by the authors in [1]. The main focus of this paper is a detailed geometric analysis of special tetragonal and pentagonal covers whose associated vector bundles on $\mathbb{P}^1$ are so unbalanced that they fail to lie in the large open subset considered in [1]. In genus $9$, we use work of Mukai [23] to present the locus of hexagonal curves as a global quotient stack, and, using equivariant intersection theory, we show its Chow ring is generated by restrictions of tautological classes.
description: 48 pages, final version, to appear in Journal of Algebraic Geometry
Energy-Efficient Resource Assignment and Power Allocation in Heterogeneous Cloud Radio Access Networks
Creators: name: Peng, Mugen
name: Zhang, Kecheng
name: Jiang, Jiamo
name: Wang, Jiaheng
name: Wang, Wenbo
Publisher: name: arXiv
Year: 2014
Subjects: subject: Information Theory (cs.IT)
subject: FOS: Computer and information sciences

description: Taking full advantages of both heterogeneous networks (HetNets) and cloud access radio access networks (CRANs), heterogeneous cloud radio access networks (H-CRANs) are presented to enhance both the spectral and energy efficiencies, where remote radio heads (RRHs) are mainly used to provide high data rates for users with high quality of service (QoS) requirements, while the high power node (HPN) is deployed to guarantee the seamless coverage and serve users with low QoS requirements. To mitigate the inter-tier interference and improve EE performances in H-CRANs, characterizing user association with RRH/HPN is considered in this paper, and the traditional soft fractional frequency reuse (S-FFR) is enhanced. Based on the RRH/HPN association constraint and the enhanced S-FFR, an energy-efficient optimization problem with the resource assignment and power allocation for the orthogonal frequency division multiple access (OFDMA) based H-CRANs is formulated as a non-convex objective function. To deal with the non-convexity, an equivalent convex feasibility problem is reformulated, and closedform expressions for the energy-efficient resource allocation solution to jointly allocate the resource block and transmit power are derived by the Lagrange dual decomposition method. Simulation results confirm that the H-CRAN architecture and the corresponding resource allocation solution can enhance the energy efficiency significantly.
description: 13 pages, 7 figures, accepted by IEEE TVT
An Action Plan for Carbon Captureand Storage in California: Opportunities,Challenges, and Solutions
Creators: name: Saltzer, Sarah
Publisher: name: Stanford Digital Repository
Year: 2023
Subjects: CCS
Carbon Capture and Storage
Carbon Sequestration

description: This study analyzes key options, including a set of technologies and support infrastructure for Carbon Capture and Storage, that could enable some “quick wins,” as well as help meet mid-century sustainable development targets.
Combining the hybrid mimetic mixed method with the Scharfetter-Gummel scheme for magnetised transport in plasmas
Creators: name: Cheng, Hanz Martin
name: Boonkkamp, Jan ten thije
name: Janssen, Jesper
name: Mihailova, Diana
name: van Dijk, Jan
Publisher: name: arXiv
Year: 2021
Subjects: subject: Plasma Physics (physics.plasm-ph)
subject: Numerical Analysis (math.NA)
subject: FOS: Physical sciences
subject: FOS: Mathematics

description: In this paper, we propose a numerical scheme for fluid models of magnetised plasmas. One important feature of the numerical scheme is that it should be able to handle the anisotropy induced by the magnetic field. In order to do so, we propose the use of the hybrid mimetic mixed (HMM) scheme for diffusion. This is combined with a hybridised variant of the Scharfetter-Gummel (SG) scheme for advection. The proposed hybrid scheme can be implemented very efficiently via static condensation. Numerical tests are then performed to show the applicability of the combined HMM-SG scheme, even for highly anisotropic magnetic fields.
Diffusion of tangential tensor fields: numerical issues and influence of geometric properties
Creators: name: Bachini, Elena
name: Brandner, Philip
name: Jankuhn, Thomas
name: Nestler, Michael
name: Praetorius, Simon
name: Reusken, Arnold
name: Voigt, Axel
Publisher: name: arXiv
Year: 2022
Subjects: subject: Numerical Analysis (math.NA)
subject: FOS: Mathematics
subject: G.1.8
subject: 58J65, 65M22, 35R01

description: We study the diffusion of tangential tensor-valued data on curved surfaces. For this purpose, several finite-element-based numerical methods are collected and used to solve a tangential surface n-tensor heat flow problem. These methods differ with respect to the surface representation used, the geometric information required, and the treatment of the tangentiality condition. We emphasize the importance of geometric properties and their increasing influence as the tensorial degree changes from n=0 to n>=1. A specific example is presented that illustrates how curvature drastically affects the behavior of the solution.
description: 25 pages, 6 figures
On the ability of the equivalent material concept in predicting ductile failure of U-notches under moderateand large-scale yielding conditions
Creators: name: Torabi Ali Reza
name: Habibi Rasool
name: Behrooz, Mohammad Hosseini
Publisher: name: Физическая мезомеханика
Year: 2015
Subjects: КОНЦЕПЦИЯ ЭКВИВАЛЕНТНОГО МАТЕРИАЛА
EQUIVALENT MATERIAL CONCEPT
U-ОБРАЗНЫЙ НАДРЕЗ
СРЕДНЯЯ ТЕКУЧЕСТЬ
ВЫСОКАЯ ТЕКУЧЕСТЬ
ЗАРОЖДЕНИЕ ТРЕЩИН
U-NOTCH
MODERATE-SCALE YIELDING
LARGE-SCALE YIELDING
CRACK INITIATION

description: In the present research, first, the equivalent material concept (EMC), proposed originally by the first author to equate a ductile material with a virtual brittle material, was utilized in conjunction with two stress-based brittle fracture criteria, namely the point-stress (PS) and the mean-stress (MS) criteria, to develop two combined failure criteria capable of predicting tensile crack initiation from U-notches in ductile materials. Then, to verify the two failure criteria, several rectangular thin plates weakened by a central bean-shaped slit with two U-shaped ends and made of aluminum alloys Al 7075-T6 and Al 6061-T6 were tested under tension. Experimental observations indicated that Al 7075-T6 plates failed by moderate-scale yielding while Al 6061-T6 by large-scale yielding. It was found that the EMC-MS criterion could predict the experimental results of both materials successfully. Meanwhile, the EMC-PS criterion was found to be accurate for moderate and large notch radii, particularly for Al 6061-T6 material.
Alle möchten, von Gerechtigkeit und Liebe geleitet, danach trachten, Verkehrsunfälle zu vermeiden.
Publisher: name: Herder Korrespondenz
Year: 1970

description: Herder Korrespondenz, Bd. 13 Nr. 9 (1958): Herder Korrespondenz, Band 13, Heft 9
Extract the energy scale of anomalous $γγ\to W^+W^-$ scattering in the vector boson scattering process using artificial neural networks
Creators: name: Yang, Ji-Chong
name: Chen, Jin-Hua
name: Guo, Yu-Chen
Publisher: name: arXiv
Year: 2021
Subjects: subject: High Energy Physics - Phenomenology (hep-ph)
subject: FOS: Physical sciences

description: As a model independent approach to search for the signals of new physics~(NP) beyond the Standard Model~(SM), the SM effective field theory~(SMEFT) draws a lot of attention recently. The energy scale of a process is an important parameter in the study of an EFT such as the SMEFT. However, for the processes at a hadron collider with neutrinos in the final states, the energy scales are difficult to reconstruct. In this paper, we study the energy scale of anomalous $γγ\to W^+W^-$ scattering in the vector boson scattering~(VBS) process $pp\to j j \ell^+\ell^-ν\barν$ at the large hadron collider~(LHC) using artificial neural networks~(ANNs). We find that the ANN is a powerful tool to reconstruct the energy scale of $γγ\to W^+W^-$ scattering. The factors affecting the effects of ANNs are also studied. In addition, we make an attempt to interpret the ANN and arrive at an approximate formula which has only five fitting parameters and works much better than the approximation derived from kinematic analysis. With the help of ANN approach, the unitarity bound is applied as a cut on the energy scale of $γγ\to W^+W^-$ scattering, which is found to has a significant suppressive effect on signal events. The sensitivity of the process $pp\to j j \ell^+\ell^-ν\barν$ to anomalous $γγWW$ couplings and the expected constraints on the coefficients at current and possible future LHC are also studied.
description: 28 pages, 15 figures
Combination of inclusive top-quark pair production cross-section measurements using ATLAS and CMS data at $\sqrt{s}= 7$ and 8 TeV
Creators: name: ATLAS
name: Collaborations, CMS
Publisher: name: arXiv
Year: 2022
Subjects: subject: High Energy Physics - Experiment (hep-ex)
subject: FOS: Physical sciences

description: A combination of measurements of the inclusive top-quark pair production cross-section performed by ATLAS and CMS in proton-proton collisions at centre-of-mass energies of 7 and 8 TeV at the LHC is presented. The cross-sections are obtained using top-quark pair decays with an opposite-charge electron-muon pair in the final state and with data corresponding to an integrated luminosity of about 5 fb$^{-1}$ at $\sqrt{s}=7$ TeV and about 20 fb$^{-1}$ at $\sqrt{s}=8$ TeV for each experiment. The combined cross-sections are determined to be $178.5 \pm 4.7$ pb at $\sqrt{s}=7$ TeV and $243.3^{+6.0}_{-5.9}$ pb at $\sqrt{s}=8$ TeV with a correlation of 0.41, using a reference top-quark mass value of 172.5 GeV. The ratio of the combined cross-sections is determined to be $R_{8/7}= 1.363\pm 0.032$. The combined measured cross-sections and their ratio agree well with theory calculations using several parton distribution function (PDF) sets. The values of the top-quark pole mass (with the strong coupling fixed at 0.118) and the strong coupling (with the top-quark pole mass fixed at 172.5 GeV) are extracted from the combined results by fitting a next-to-next-to-leading-order plus next-to-next-to-leading-log QCD prediction to the measurements. Using a version of the NNPDF3.1 PDF set containing no top-quark measurements, the results obtained are $m_t^\text{pole} = 173.4^{+1.8}_{-2.0}$ GeV and $α_\text{s}(m_Z)= 0.1170^{+ 0.0021}_{-0.0018}$.
description: 59 pages in total, author lists starting at page 24, 4 figures, 6 tables. All figures including auxiliary figures are available at https://atlas.web.cern.ch/Atlas/GROUPS/PHYSICS/PAPERS/TOPQ-2018-39 and at https://cms-results.web.cern.ch/cms-results/public-results/publications/TOP-18-014/index.html
Microcalorimetric and SAXS Determination of PEO-SDS Interactions: The Effect of Cosolutes Formed by Ions
Creators: name: Barbosa, Aparecida Mageste
name: Santos, Igor José Boggione
name: Ferreira, Guilherme Max Dias
name: da Silva, Maria do Carmo Hespanhol
name: Teixeira, Alvaro Vianna Novaes de Carvalho
name: da Silva, Luis Henrique Mendes
Publisher: name: arXiv
Year: 2014
Subjects: subject: Materials Science (cond-mat.mtrl-sci)
subject: Soft Condensed Matter (cond-mat.soft)
subject: Chemical Physics (physics.chem-ph)
subject: FOS: Physical sciences

description: The effect of different ionic cosolutes (NaCl, Na$_2$SO$_4$, Li$_2$SO$_4$, NaSCN, Na$_2$[Fe(CN)5NO], and Na$_3$[Co(NO)$_6$]) on the interaction between sodium dodecyl sulfate (SDS) and poly(ethylene oxide) (PEO) was examined by small-angle X-ray scattering (SAXS) and isothermal titration calorimetric techniques. The critical aggregation concentration values (cac), the saturation concentration ($C_2$), the integral enthalpy change for aggregate formation ($ΔH_{\mbox{agg}}$(int)) and the standard free energy change of micelle adsorption on the macromolecule chain ( $ΔΔG_{\mbox{agg}}$) were derived from the calorimetric titration curves. In the presence of 1.00 mmol L$^{-1}$ cosolute, no changes in the parameters were observed when compared with those obtained for SDS-PEO interactions in pure water. For NaCl, Na$_2$SO$_4$, Li$_2$SO$_4$, and NaSCN at 10.0 and 100 mmol L$^{-1}$, the cosolute presence lowered cac, increased $C_2$, and the PEO-SDS aggregate became more stable. In the presence of Na$_2$[Fe(CN)5NO], the calorimetric titration curves changed drastically, showing a possible reduction in the PEO-SDS degree of interaction, possibility disrupting the formed nanostructure; however, the SAXS data confirmed, independent of the small energy observed, the presence of aggregates adsorbed on the polymer chain.
description: 8 pages, 8 figures
SARLAVHA: G'AZNACHILIK TIZIMIDA NAZORAT TADBIRLARINI O'TKAZISH VA TAKOMILLASHTIRISH
Creators: name: Xasanov, Adiz
Publisher: name: Zenodo
Year: 2024

description: O’zbekiston Respublikasining moliyaviy barqarorligi va iqtisodiy o’sishining muhim omili sifatida g‘aznachilik tizimining roli katta ahamiyat kasb etmoqda. Moliyaviy resurslarni samarali boshqarish, ularning shaffofligi va hisobdorligi, davlat va jamiyatning barqaror rivojlanishi uchun hal qiluvchi omillar hisoblanadi. Shu sababli, g‘aznachilik tizimida amalga oshiriladigan nazorat tadbirlarining sifati va samaradorligi, ushbu tizimning umumiy ishlashiga bevosita ta'sir ko’rsatadi. O’zbekiston Respublikasida so’nggi yillarda amalga oshirilayotgan iqtisodiy islohotlar jarayonida g‘aznachilik tizimining rolini yanada mustahkamlash va uning samaradorligini oshirish masalalari dolzarb bo’lib qolmoqda.
Critical plane orientation influence on multiaxial high-cycle fatigue assessment
Creators: name: Carpinteri Andrea
name: Ronchei Camilla
name: Scorza Daniela
name: Vantadori Sabrina
Publisher: name: Физическая мезомеханика
Year: 2015
Subjects: НАГРУЗКА С ПОСТОЯННОЙ АМПЛИТУДОЙ
ОРИЕНТАЦИЯ КРИТИЧЕСКОЙ ПЛОСКОСТИ
ОЦЕНКА УСТАЛОСТНОЙ ПРОЧНОСТИ
МОДИФИЦИРОВАННЫЙ КРИТЕРИЙ CARPINTERI-SPAGNOLI
МНОГОЦИКЛОВАЯ УСТАЛОСТЬ ПРИ МНОГООСНОМ НАГРУЖЕНИИ
CONSTANT AMPLITUDE LOADING
CRITICAL PLANE ORIENTATION
FATIGUE LIFETIME ESTIMATION
MODIFIED CARPINTERI-SPAGNOLI CRITERION
MULTIAXIAL HIGH-CYCLE FATIGUE

description: In the present paper, the multiaxial fatigue lifetime of structural components failing in the high-cycle fatigue regime is evaluated by employing the modified Carpinteri-Spagnoli (C-S) multiaxial fatigue criterion based on the critical plane approach. In the above criterion, the critical plane position is linked to averaged principal stress directions through an off-angle δ. Then, the fatigue damage parameter used is determined by a nonlinear combination of an equivalent normal stress amplitude and the shear stress amplitude acting on the critical plane. In the present paper, some modifications of the original expression for the off-angle δ are implemented in the modified Carpinteri-Spagnoli criterion. In particular, modified expressions recently proposed by Lagoda et al. are in accordance with the assumption originally developed by Carpinteri and co-workers, that is, the off-angle is a function of the ratio between the fatigue limit under fully reversed shear stress and that under fully reversed normal stress. Such expressions can be employed for metals ranging from mild to very hard fatigue behaviour. Some experimental data available in the literature are compared with the theoretical estimations and, only for materials with hard and very hard fatigue behaviour, the modified δ relationships are shown to yield fatigue lifetime results slightly better than those determined through the original δ expression.
Exploring Techniques for the Analysis of Spontaneous Asynchronicity in MPI-Parallel Applications
Creators: name: Afzal, Ayesha
name: Hager, Georg
name: Wellein, Gerhard
name: Markidis, Stefano
Publisher: name: arXiv
Year: 2022
Subjects: subject: Distributed, Parallel, and Cluster Computing (cs.DC)
subject: Machine Learning (cs.LG)
subject: Performance (cs.PF)
subject: FOS: Computer and information sciences

description: This paper studies the utility of using data analytics and machine learning techniques for identifying, classifying, and characterizing the dynamics of large-scale parallel (MPI) programs. To this end, we run microbenchmarks and realistic proxy applications with the regular compute-communicate structure on two different supercomputing platforms and choose the per-process performance and MPI time per time step as relevant observables. Using principal component analysis, clustering techniques, correlation functions, and a new "phase space plot," we show how desynchronization patterns (or lack thereof) can be readily identified from a data set that is much smaller than a full MPI trace. Our methods also lead the way towards a more general classification of parallel program dynamics.
description: 12 pages, 9 figures, 1 table
Abundance stratification in Type Ia Supernovae - IV: the luminous, peculiar SN 1991T
Creators: name: Sasdelli, Michele
name: Mazzali, Paolo A.
name: Pian, Elena
name: Nomoto, Ken'ichi
name: Hachinger, Stephan
name: Cappellaro, Enrico
name: Benetti, Stefano
Publisher: name: arXiv
Year: 2014
Subjects: subject: Solar and Stellar Astrophysics (astro-ph.SR)
subject: FOS: Physical sciences

description: The abundance distribution of the elements in the ejecta of the peculiar, luminous Type Ia supernova (SN Ia) 1991T is obtained modelling spectra from before maximum light until a year after the explosion, with the method of "Abundance Tomography". SN 1991T is different from other slowly declining SNe Ia (e.g. SN 1999ee) in having a weaker Si II 6355 line and strong features of iron group elements before maximum. The distance to the SN is investigated along with the abundances and the density profile. The ionization transition that happens around maximum sets a strict upper limit on the luminosity. Both W7 and the WDD3 delayed detonation model are tested. WDD3 is found to provide marginally better fits. In this model the core of the ejecta is dominated by stable Fe with a mass of about 0.15 solar masses, as in most SNe Ia. The layer above is mainly 56Ni up to v~10000 km/s (~0.78 solar masses). A significant amount of 56Ni (~3 %) is located in the outer layers. A narrow layer between 10000 km/s and ~12000 km/s is dominated by intermediate mass elements (IME), ~0.18 solar masses. This is small for a SN Ia. The high luminosity and the consequently high ionization, and the high 56Ni abundance at high velocities explain the peculiar early-time spectra of SN 1991T. The outer part is mainly of oxygen, ~0.3 solar masses. Carbon lines are never detected, yielding an upper limit of 0.01 solar masses for C. The abundances obtained with the W7 density model are qualitatively similar to those of the WDD3 model. Different elements are stratified with moderate mixing, resembling a delayed detonation.
description: 19 pages, 9 figures, 4 tables, accepted for publication in MNRAS
Thermodynamics of a dilute Bose gas: A path-integral Monte Carlo study
Creators: name: Spada, Gabriele
name: Pilati, Sebastiano
name: Giorgini, Stefano
Publisher: name: arXiv
Year: 2021
Subjects: subject: Quantum Gases (cond-mat.quant-gas)
subject: Computational Physics (physics.comp-ph)
subject: Quantum Physics (quant-ph)
subject: FOS: Physical sciences

description: We present precise path-integral Monte-Carlo results for the thermodynamics of a homogeneous dilute Bose gas. Pressure and energy are calculated as a function of temperature both below and above the Bose-Einstein transition. Specifically, we address interaction effects, focusing on deviations from the ideal gas law in the thermodynamic limit. We also calculate the isothermal compressibility and the contact parameter, which provide a clear signature of the role played by interactions. In particular, we show that the compressibility exhibits a discontinuity at the transition point. To gain physical insight, numerical results are systematically compared with the predictions of first-order Hartree-Fock and second-order Popov theories, both giving an approximate description of the gas thermodynamics. The comparison shows the extension of the critical region around the transition point, where the inaccuracies of the perturbative expansions are more pronounced.
description: v3: corrected typos in eqs.(15), (A10) and (A11), updated fig.8 with corrected perturbative predictions, implements errata corrige on published version; v2: 10 pages, improved fig.2 and corresponding discussion; v1: 9 pages, 8 figures, data available on zenodo.org
Algoritmo Baseado na Meta-heurÍstica Particle Swarm Optimization para Configuração de Pools de Threads em Motores de Execução de Plataformas de Integração
Creators: name: BRIGO, MAIRA S.
name: FRANTZ, RAFAEL Z.
name: FREIRE, DANIELA L.
Publisher: name: Zenodo
Year: 2020

description: Vídeo de apresentação do artigo "Algoritmo Baseado na Meta-heurÍstica Particle Swarm Optimization para Configuração de Pools de Threads em Motores de Execução de Plataformas de Integração" da Sessão Técnica 2, do Fórum de Pós-Graduação da IV Escola Regional de Engenharia de Software.
Crack tip opening angle as a fracture resistance parameter to describe ductile crack extension and arrest in steel pipes under service pressure
Creators: name: Mohamed, Ben Amara
name: Pluvinage Guy
name: Capelle Julien
name: Azari Zitouni
Publisher: name: Физическая мезомеханика
Year: 2015
Subjects: РАСПРОСТРАНЕНИЕ ВЯЗКИХ ТРЕЩИН
DUCTILE CRACK EXTENSION
ТРУБА
PIPE
УГОЛ РАСКРЫТИЯ ВЕРШИНЫ ТРЕЩИНЫ
CRACK TIP OPENING ANGLE (CTOA)
СТАЛЬ
STEEL

description: The angle between two element sides representing the crack tip is defined as the crack tip opening angle (CTOA). Its critical value is used as a criterion of fracture resistance for characterizing stable tearing in thin metallic materials. Various methods are used for determination of the CTOA. Optical microscopy is one of the most common methods as well as fitting of experimental load-displacement diagrams by the finite element method (DIC). Additionally, analytical analysis using the experimental load-displacement curve method (SSM) derived from the plastic hinge model of deflection in three-point bending of a ductile specimen is applied. This approach assumes a constant rotation centre distance. Values of CTOA for API 5L X65 pipe steel found by three methods-DIC, CNM, and SSM-are given. Values of CTOA given by these three methods are similar and close to 20°. A discussion on the different parameters used to characterize the fracture resistance of running cracks in a pipe under service pressure is presented. The energy of fracture at impact determined by Charpy or drop-weight tear test (DWTT) tests and the critical J energy parameter are considered as well as the yield locus after damage, cohesive zone energy, and CTOA is another approach. One notes that CTOA is assumed to be constant during stable crack extension and decreases linearly with crack length during the instable and primary phase. A numerical technique to describe a ductile running crack using the node release technique and using CTOA as the fracture resistance criterion is presented. This method is compared with three different two-curve methods (TCMs): the Battelle, high strength line pipe (HLP), and HLP-Sumitomo methods. The Batelle TCM, as the oldest method, based on Charpy energy, gives a strongly conservative prediction. Predictions by the CTOA method are close to those obtained by the HLP-Sumitomo one.
Central AdS Generalized Ay{ó}n-Beato-Garc{\'ı}a Black Holes and Joule-Thomson Expansion
Creators: name: Ghasemi, Elham
name: Ghaffarnejad, Hossein
Publisher: name: arXiv
Year: 2022
Subjects: subject: General Relativity and Quantum Cosmology (gr-qc)
subject: High Energy Physics - Theory (hep-th)
subject: FOS: Physical sciences

description: In this paper, the Joule-Thomson (JT) adiabatic expansion is investigated for generalized Ayon-Beato-Garcia (ABG) regular black hole. It has a magnetic charge which makes central region of the black hole metric to be AdS spacetime and so become non singular. Thus we not need to use an additional cosmological parameter coming from ADS/CFT correspondence for production of pressure coordinate in the black hole equation of state. Form this point of view our work is a new approach versus to conventional methods which are addressed in the references of this paper. However we will see important behavior of parameters of this modified ABG black hole on possibility of being of JT adiabatic expansion. This black hole is characterized by five parameters including mass $m$, magnetic charge $q$, and three other parameters related to form of used nonlinear electromagnetic interaction fields. Inversion points are in fact a particular T-P curve at constant enthalpy and it separates cooling and heating phase of the modified AdS ABG black hole.
description: 13 pages and 8 figures
Floquet engineering multi-channel Kondo physics
Creators: name: Quito, Victor L.
name: Flint, Rebecca
Publisher: name: arXiv
Year: 2021
Subjects: subject: Strongly Correlated Electrons (cond-mat.str-el)
subject: FOS: Physical sciences

description: Floquet engineering is a powerful technique using periodic potentials, typically laser light, to drive materials into regimes inaccessible in equilibrium. Here, we show that Kondo models can be driven to multi-channel degenerate points, even when the starting model is single-channel. These emergent channels are differentiated by symmetry, and their strength and number can be controlled by changing the light polarization, frequency and amplitude. Unpolarized light, constructed by polarization averaging, is particularly useful to induce three and four channel degeneracies. Multi-channel Kondo models host a wide variety of exotic phenomena, including non-Abelian anyons in impurity models and composite pair superconductivity in lattice models. We demonstrate our findings on both a simple square lattice toy model and a more realistic spin-orbit coupled model for $J=5/2$ Ce ions in a tetragonal environment, as relevant for the Ce 115 materials, and show that the transition temperature for composite pair superconductivity can be dynamically enhanced.
description: 19 pages including Appendices, 10 figures
Regularity for parabolic integro-differential equations with very irregular kernels
Creators: name: Schwab, Russell W.
name: Silvestre, Luis
Publisher: name: arXiv
Year: 2014
Subjects: subject: Analysis of PDEs (math.AP)
subject: Probability (math.PR)
subject: FOS: Mathematics

description: We prove Hölder regularity for a general class of parabolic integro-differential equations, which (strictly) includes many previous results. We present a proof which avoids the use of a convex envelop as well as give a new covering argument which is better suited to the fractional order setting. Our main result involves a class of kernels which may contain a singular measure, may vanish at some points, and are not required to be symmetric. This new generality of integro-differential operators opens the door to further applications of the theory, including some regularization estimates for the Boltzmann equation.
Using a nested anomaly detection machine learning algorithm to study the neutral triple gauge couplings at an \texorpdfstring{$e^+e^-$}{e+e-} collider
Creators: name: Yang, Ji-Chong
name: Guo, Yu-Chen
name: Cai, Li-Hua
Publisher: name: arXiv
Year: 2021
Subjects: subject: High Energy Physics - Phenomenology (hep-ph)
subject: FOS: Physical sciences

description: Anomaly detection algorithms have been proved to be useful in the search of new physics beyond the Standard Model. However, a prerequisite for using an anomaly detection algorithm is that the signal to be sought is indeed anomalous. This does not always hold true, for example when interference between new physics and the Standard Model becomes important. In this case, the search of new physics is no longer an anomaly detection. To overcome this difficulty, we propose a nested anomaly detection algorithm, which appears to be useful in the study of neutral triple gauge couplings at the CEPC, the ILC and the FCC-ee. Our approach inherits the advantages of the anomaly detection algorithm been nested, while at the same time, it is no longer an anomaly detection algorithm. As a complement to anomaly detection algorithms, it can achieve better results on problems that are no longer anomaly detection.
description: 12 pages, 6 figures