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A Novel Model for Describing Rail Weld Irregularities and Predicting Wheel-Rail Forces Using a Machine Learning Approach

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Computer Modeling in Engineering & sciences 2025年第1期142卷 555-577页

作者： Linlin Sun Zihui Wang Shukun Cui Ziquan Yan Weiping Hu Qingchun Meng State Key Laboratory of High-Speed Railway Track System China Academy of Railway Sciences Corporation LimitedBeijing100081China Railway Engineering Research Institute China Academy of Railway Sciences Corporation LimitedBeijing100081China School of Aeronautic Science and Engineering Beihang UniversityBeijing100191China

Rail weld irregularities are one of the primary excitation sources for vehicle-track interaction dynamics in modern high-speed *** can cause significant wheel-rail dynamic interactions,leading to wheel-rail noise,component damage,and *** researchers have employed the vehicle-track interaction dynamic model to study the dynamic interactions between wheel and rail induced by rail weld geometry ***,the cosine wave model used to simulate rail weld irregularities mainly focuses on the maximum value and neglects the geometric *** this study,novel theoretical models were developed for three categories of rail weld irregularities,based on measurements of the high-speed railway from Beijing to *** vertical dynamic forces in the time and frequency domains were compared under different running *** forces generated by the rail weld irregularities that were measured and modeled,respectively,were compared to validate the accuracy of the proposed ***,based on the numerical study,the impact force due to rail weld irrregularity is modeled using an Artificial Neural Network(ANN),and the optimum combination of parameters for this model is *** results showed that the proposed model provided a more accurate wheel/rail dynamic evaluation caused by rail weld irregularities than that established in the *** ANN model used in this paper can effectively predict the impact force due to rail weld irrregularity while reducing the computation time.

关键词： Rail weld irregularity high-speed railway vehicle-track coupled dynamics wheel/rail dynamic vertical force artificial neural networks

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Multitarget stool DNA for colorectal cancer screening:A review and commentary on the United States Preventive Services Draft Guidelines

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World Journal of Gastrointestinal Oncology 2016年第5期8卷 450-458页

作者： Barry M Berger Bernard Levin Robert J Hilsden Medical Affairs Exact Sciences Corporation Scientific Advisory Board Exact Sciences Departments of Medicine and Community Health sciences University of Calgary

Multitarget stool DNA(mt-sDNA) testing was approved for average risk colorectal cancer(CRC) screening by the United States Food and Drug Administration and thereafter reimbursed for use by the Medicare program(2014).The United States Preventive Services Task Force(USPSTF) October 2015 draft recommendation for CRC screening included mt-s DNA as an "alternative" screening test that "may be useful in select clinical circumstances",despite its very high sensitivity for early stage *** evidence supporting mt-s DNA for routine screening use is *** clinical efficacy of mt-s DNA as measured by sensitivity,specificity,life-years gained(LYG),and CRC deaths averted is similar to or exceeds that of the other more specifically recommended screening options included in the draft document,especially those requiring annual testing *** a population with primarily irregular screening participation,tests with the highest point sensitivity and reasonable specificity are more likely to favorably impact CRC related morbidity and mortality than those depending on annual *** paper reviews the evidence supporting mt-s DNA for routine screening and demonstrates,using USPSTF's modeling data,that mt-s DNA at three-year intervals provides significant clinical net benefits and fewer complications per LYG than annual fecal immunochemical testing,high sensitivity guaiac based fecal occult blood testing and 10-year colonoscopy screening.

关键词： Colorectal cancer screening Multitarget stool DNA Stool DNA The United States Preventive Services Task Force Cancer Intervention Surveillance Modeling Network Fecal immunological technique Modeling Interval

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THE HARDY TYPE INEQUALITY FOR THE MAXIMAL OPERATOR OF THE ONE-DIMENSIONAL DYADIC DERIVATIVE

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Acta Mathematica Scientia 2011年第4期31卷 1489-1493页

作者： Ushangi Goginava Institute of Mathematics Faculty of Exact and Natural Sciences Tbilisi State University

In this paper we prove that the maximal operator I of dyadic derivative is not bounded from the Hardy space H p [0, 1] to the Hardy space H p [0, 1], when 0 〈 p ≤ 1.

关键词： Walsh function Hardy space dyadic derivative

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On CAP Representations for Even Orthogonal Groups I:A Correspondence of Unramified Representations

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Chinese Annals of Mathematics,Series B 2015年第4期36卷 485-522页

作者： David GINZBURG Dihua JIANG David SOUDRY School of Mathematical sciences Sackler Faculty of Exact Sciences Tel-Aviv University School of Mathematics University of Minnesota

The authors prove the local unramified correspondence for a new type of construction of CAP representations of even orthogonal groups by a generalized automorphic descent method. This method is expected to work for al... 详细信息

关键词： Automorphic representations Fourier coefficients Satake parametertransfer

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Periods of automorphic forms,poles of L-functions and functorial lifting

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Science China Mathematics 2010年第9期53卷 2215-2238页

作者： GINZBURG David SOUDRY David School of Mathematical sciences Sackler Faculty of Exact SciencesTel-Aviv University69978Israel

In this paper,we survey our work on period,poles or special values of certain automorphic Lfunctions and their relations to certain types of Langlands functorial *** outline proofs for some results and leave others as... 详细信息

关键词： period of automorphic forms L-functions Langlands functoriality

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Plasmonic nanostructure design and characterization via Deep Learning

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Light(Science & Applications) 2018年第1期7卷 475-482页

作者： Itzik Malkiel Michael Mrejen Achiya Nagler Uri Arieli Lior Wolf Haim Suchowski School of Computer Science Faculty of Exact SciencesTel Aviv UniversityTel Aviv 69978Israel School of Physics and Astronomy Faculty of Exact SciencesTel Aviv UniversityTel Aviv 69978Israel

Nanophotonics,the field that merges photonics and nanotechnology,has in recent years revolutionized the field of optics by enabling the manipulation of light–matter interactions with subwavelength ***,despite the many advances in this field,the design,fabrication and characterization has remained widely an iterative process in which the designer guesses a structure and solves the Maxwell’s equations for *** contrast,the inverse problem,i.e.,obtaining a geometry for a desired electromagnetic response,remains a challenging and time-consuming task within the boundaries of very specific ***,we experimentally demonstrate that a novel Deep Neural Network trained with thousands of synthetic experiments is not only able to retrieve subwavelength dimensions from solely farfield measurements but is also capable of directly addressing the inverse *** approach allows the rapid design and characterization of metasurface-based optical elements as well as optimal nanostructures for targeted chemicals and biomolecules,which are critical for sensing,imaging and integrated spectroscopy applications.

关键词： characterization inverse dimensions

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Remediation effect of compost on soluble mercury transfer in a crop of Phaseolus vulgaris

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Journal of Environmental sciences 2015年第5期27卷 61-67页

作者： Nora E.Restrepo-Sánchez Liliana Acevedo-Betancourth Beatriz Henao-Murillo Carlos Peláez-Jaramillo Interdisciplinary Group of Molecular Studies (GIEM) Institute of Chemistry Faculty of Natural and Exact Sciences University of Antioquia

We studied the dynamics of mercury（Hg） transfer in Phaseolus vulgaris plants grown in soil with Hg-doped compost at the maximum levels permitted by Colombian law on organic amendments. Quantitative evaluation of transfer was made in different plant organs： roots,stem, leaves, pods and seeds. Matrix effect was determined in doped soil assays, using soil with and without addition of compost. Results showed that the use of organic matter reduced Hg transfer to the plant and the amount transferred was differentially distributed to the organs. We observed an inverse relationship between concentration and distance from the body to the root. It was evident that transfer was mediated by quantitative factors;the greater the presence of mercury in soil, the larger the amount that will be *** also indicate the remedial effect of compost and the presence of a barrier, at the root level, against mercury translocation to the plant aerial parts.

关键词： Trophic transfer Mercury Organic matter Soil pollution Remediation

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Fold completeness of a system of root vectors of a system of unbounded polynomial operator pencils in Banach spaces.Ⅱ.Application

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Science China Mathematics 2013年第1期56卷 105-122页

作者： YAKUBOV Yakov Raymond and Beverly Sackler Faculty of exact sciences School of Mathematical SciencesTel-Aviv University

This paper is a continuation of the author＇s paper in 2009, where the abstract theory of fold com- pleteness in Banach spaces has been presented. Using obtained there abstract results, we consider now very general boundary value problems for ODEs and PDEs which poIynomially depend on the spectral parameter in both the equation and the boundary conditions. Moreover, equations and boundary conditions may con- rain abstract operators as well. So, we deal, generally, with integro-differential equations, functional-differential equations, nonlocal boundary conditions, multipoint boundary conditions, integro-differential boundary condi- tions. We prove n-fold completeness of a system of root functions of considered problems in the corresponding direct sum of Sobolev spaces in the Banach Lq-framework, in contrast to previously known results in the Hilbert L2-framework. Some concrete mechanical problems are also presented.

关键词： fold completeness discrete spectrum regular problems eigenvalues root functions

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A mixed problem of plate bending for doubly connected domains with partially unknown boundaries in the presence of cyclic symmetry

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Science China(Physics,Mechanics & Astronomy) 2010年第10期53卷 1884-1894页

作者： Odishelidze N Criado-Aldeanueva F Faculty of exact and Natural sciences Tbilisi State University Department of Applied Physics II University of Malaga

This paper addresses the problem of plate bending for a doubly connected body with outer and inner boundaries in the form of regular polygons with a common center and parallel *** neighborhoods of the vertices of the inner boundary are equal full-strength smooth arcs symmetric about the rays coming from the vertices to the center,but have unknown *** bars are attached to the linear parts of the *** plate bends by the moments applied to the middle point *** unknown arcs are free from external *** same problem of plate bending is considered for a regular hexagon weakened by a full-strength *** the methods of complex analysis,the analytical image of Kolosov-Muskhelishvili's complex potentials (characterizing an elastic equilibrium of the body),the plate deflection and unknown parts of its boundary are determined under the condition that the tangential normal moment on that plate takes a constant *** analyses are also performed and the corresponding graphs are constructed.

关键词： plate bending theory complex variable.

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Magnetic and Electronic Properties of Double Perovskite Ba2SmNbO6 without Octahedral Tilting by First Principle Calculations

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Chinese Physics Letters 2017年第7期34卷 168-172页

作者： Abdelkader Khouidmi Hadj Baltache Ali Zaoui Faculty of exact sciences Djillali Liabes University Sidi Bel-Abbes 22000 Algeria Faculty of sciences and Technology Mustapha Stambouli University Mascara 29000 Algeria

The structural, magnetic and electronic properties of the double perovskite Ba2SmNbO6 （for the simple cubic structure where no octahedral tilting exists anymore） are studied using the density functional theory within the generalized gradient approximation as well as taking into account the on-site Coulomb repulsive interaction. The total energy, the spin magnetic moment, the band structure and the density of states are calculated. The optimization of the lattice constants is 8.5173 A, which is in good agreement with the experimental value 8.5180 A. The calculations reveal that Ba2SmNbO6 has a stable ferromagnetic ground state and the spin magnetic moment per molecule is 5.00μB/f.u. which comes mostly from the Sin3＋ ion only. By analysis of the band structure, the compound exhibits the direct band gap material and half-metallic ferromagnetic nature with 100% spin-up polarization, which implies potential applications of this new lanthanide compound in magneto-electronic and spintronic devices.

关键词： Ba Magnetic and Electronic Properties of Double Perovskite Ba2SmNbO6 without Octahedral Tilting by First Principle Calculations GGA

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