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Flexible pavement longitudinal joint quality evaluation using non-destructive testing

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Journal of Road Engineering 2024年第2期4卷 189-202页

作者： Hamad Bin Muslim Syed Waqar Haider lev Khazanovich Department of Civil and Environmental Engineering Michigan State UniversityEast LansingMI 48824USA Department of Civil and Environmental Engineering University of PittsburghPittsburghPA 15261USA

Longitudinal joint construction quality is critical to the life of flexible *** deteriorated longitudinal joints has become a challenge for many highway *** the joint's quality through better compaction during construction can help achieve flexible pavements with longer service lives and less *** quality control(QC)and quality assurance(QA)plans provide limited ***,the risk of missing areas with poor joint compaction is significant.A density profiling system(DPS)is a non-destructive alternative to conventional destructive evaluation *** can provide quick and continuous real-time coverage of the compaction during construction in *** paper presents several case studies comparing various types of longitudinal joints and demonstrating the use of DPS to evaluate the joint's compaction *** paper shows that dielectric measurements can provide valuable insight into the ability of various construction techniques to achieve adequate levels of compaction at the longitudinal *** paper proposes a dielectric-based longitudinal joint quality index(LJQI)to evaluate the relative compaction of the joint during *** also shows that adopting DPS for assessing the compaction of longitudinal joints can minimize the risk of agencies accepting poorly constructed joints,identify locations of poor quality during construction,and achieve better-performing flexible pavements.

关键词： Sustainable pavements Dielectric/density profiling system Quality assurance Non-destructive testing Asphalt longitudinal joint

Visual guidelines and tutoring in pediatric urological surgery

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复古是时尚永远的腔调摄影师lev Efimov的时尚人像

当代泌尿学（英文） 2024年第1期18卷 18-22页

作者： Stanislav Kotcherov Shahar Rotem Jawdat Jaber Galit Avraham Gennady lev Michal Darmon Yudith Gabay Boris Chertin Department of Pediatric Urology Shaare Zedek Medical CenterFaculty of MedicineHebrew UniversityJerusalemIsrael Department of Pediatric Surgery Shaare Zedek Medical CenterFaculty of MedicineHebrew UniversityJerusalemIsrael The Operation Room Shaare Zedek Medical CenterJerusalemIsrael

Background:The aim of this prospective randomized study was to evaluate the impact of visual guidelines(picture book)and parents tutoring on pediatric urological surgery on parent's stress and anxiety,the number of postoperative contacts,and complications.Materials and methods:Following institutional ethical committee approval,a special picture book reflecting different stages of the con-valescent period following multiple types of pediatric urological surgery was *** were randomly divided into 2 groups in which 33 parents in Group 1 received the picture book in addition to routine instructions prior to the surgery and 31 in Group 2 received only routine postoperative *** parents were asked to answer a questionnaire(Amsterdam Preoperative Anxiety and Infor-mation Scale)regarding the level of anxiety before surgery and immediately after surgery in the recovery *** number of postop-erative parent's calls,nonplaned emergency room visits,and complications were recorded.Results:No statistically significant difference in perioperative parental anxiety was found(p=0.88).The visual tutoring group had a sig-nificantly lower rate of emergency room admissions(6.6％vs.18.6％,p=0.0433),however parents from this group made a higher num-ber of postoperative calls(9.9％vs.3.1％,p=0.38).Two(6.6％)from the tutoring group expressed their desire to omit visual counseling in future surgical preparation and 4(13.2％)did not have an *** satisfaction with regards to the preoperative counseling and information and the number of postoperative complications was similar in both groups.Conclusions:Visual tutoring does not add any value to parental anxiety but seems helpful in reducing postoperative emergency room *** parents preferred to exclude visual information from future preoperative counseling.

关键词： Anesthesia Children Hypospadias Pediatric case Questionnaires

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人像摄影 2020年第9期 12-25页

作者： Demi(文/采访) 列夫·叶菲莫夫(摄影) 不详

拍照是自我欣赏的一种方式列夫·叶菲莫夫(lev Efimov),1980年出生在苏联西北部一个名叫普斯科夫(Pskov)的小城市。“我2003年就结婚了,现在是三个男孩的父亲,成为父亲大概是发生在我身上最神奇和快乐的事情了。另一件神奇的事就是摄影... 详细信息

拍照是自我欣赏的一种方式列夫·叶菲莫夫(lev Efimov),1980年出生在苏联西北部一个名叫普斯科夫(Pskov)的小城市。“我2003年就结婚了,现在是三个男孩的父亲,成为父亲大概是发生在我身上最神奇和快乐的事情了。另一件神奇的事就是摄影,我大学的专业是生物学,和摄影最初的相遇是在2005年,那时还只是作为爱好。”

关键词：自我欣赏叶菲莫夫普斯科夫摄影师生物学时尚

Multi-gene genetic programming extension of AASHTO M-E for design oflow-volume concrete pavements

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Journal of Road Engineering 2022年第3期2卷 252-266页

作者： Haoran Li lev Khazanovich Department of Civil and Environmental Engineering University of PittsburghPittsburghPA 15261USA

The American Association of State Highway and Transportation Officials Mechanistic-Empirical Pavement DesignGuide (AASHTO M-E) offers an opportunity to design more economical and sustainable high-volume rigid pavementscompared to conventional design guidelines. It is achieved through optimizing pavement structural andthickness design under specified climate and traffic conditions using advanced M-E principles, thereby minimizingeconomic costs and environmental impact. However, the implementation of AASHTO M-E design for low-volumeconcrete pavements using AASHTOWare Pavement ME Design (Pavement ME) software is often overly *** is because Pavement ME specifies the minimum design thickness of concrete slab as 152.4 mm (6 in.). Thispaper introduces a novel extension of the AASHTO M-E framework for the design of low-volume joint plain concretepavements (JPCPs) without modification of Pavement ME. It utilizes multi-gene genetic programming (MGGP)-based computational models to obtain rapid solutions for JPCP damage accumulation and long-term performanceanalyses. The developed MGGP models simulate the fatigue damage and differential energy accumulations. Thispermits the prediction of transverse cracking and joint faulting for a wide range of design input parameters and axlespectrum. The developed MGGP-based models match Pavement ME-predicted cracking and faulting for rigidpavements with conventional concrete slab thicknesses and enable rational extrapolation of performance predictionfor thinner JPCPs. This paper demonstrates how the developed computational model enables sustainable lowvolumepavement design using optimized ME solutions for Pittsburgh, PA, conditions.

关键词： Mechanistic-empirical pavement design guide Low-volume roads Concrete pavement Transverse cracking Joint faulting Multi-gene genetic programming(MGGP)

Onsite strength determination for early-opening decision making of high early strength concrete pavement

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Journal of Traffic and Transportation Engineering(English Edition) 2023年第2期10卷 291-303页

作者： Katelyn Kosar Lucio Salles de Salles Naser Pourakbar Sharifi Julie Vandenbossche lev Khazanovich Department of Civil and Environmental Engineering University of PittsburghPittsburghPA 15261USA Department of Civil Engineering Technology Environmental Management and SafetyRochester Institute of TechnologyRochesterNY 14623USA

High early strength(HES)concrete pavements are commonly opened to traffic within the first 24 h after construction,making early-opening decisions critical for pavement quality and traffic ***,most state departments of transportation rely on compressive strength testing for early-opening decision ***,there laboratory tests are labor intensive,costly and not always representative of field strength *** this study,non-destructive testing(maturity and ultrasonic tomography)was explored for faster and reliable in-situ strength *** experimental section constructed using HES concrete was routinely monitored using compressive testing,maturity,and ultrasonic tomography in the first 24 h after *** shear wave velocity,measured using ultrasonic tomography,was able to capture the strength-gain variability within a single slab and between different slabs due to the ability to monitor several locations in a short period of *** results were consistently conservative in the first 24 h of *** show that both maturity testing and ultrasonic tomography are able to replace or add to conventional strength testing for HES concrete pavements to facilitate making the opening decision within the first 24 *** tomography proved more beneficial as a result of the device's portability,increased speed of testing,and accurate estimations of HES concrete strength for the entire pavement length.

关键词： Road engineering High early strength concrete pavement Traffic early-opening Strength Maturity Ultrasonic tomography

Titanium oxide artificial synaptic device:Nanostructure modeling and synthesis,memristive cross-bar fabrication,and resistive switching investigation

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Nano Research 2023年第7期16卷 10222-10233页

作者： Vadim I.Avilov Roman V.Tominov Zakhar E.Vakulov lev G.Zhavoronkov Vladimir A.Smirnov Research Laboratory Neuroelectronics and Memristive Nanomaterials(NEUROMENA Lab) Southern Federal UniversityTaganrog 347922Russia Institute of Nanotechnologies Electronics and Electronic Equipment EngineeringSouthern Federal UniversityTaganrog 347922Russia

The paper shows the results of the mathematical model development and the numerical simulation of the oxygen vacancies,and the distribution of TiO,Ti_(2)O_(3),and TiO_(2)oxides in the titanium oxide nanostructure obtained by local anodic oxidation(anodization).The effect of the anodization voltage pulse duration and amplitude on the titanium oxide composition distribution and the conduction channel formation was *** device prototypes based on electrochemical titanium oxide are fabricated and *** was shown that forming free resistive switching between the low resistances state(LRS)1.43±0.54 kΩand the high resistance state(HRS)28.75±9.75 kΩwere observed during 100,000 switching cycles and LRS 1.49±0.23 kΩwas maintained for 10,000 *** resistive switching of the synaptic device prototype was *** was shown that increasing Uset from 0.5 to 1.5 V leads to different LRS from 3.96±0.19 to 0.71±0.10 kΩ.The results obtained can be used in the development of technological foundations for the formation of high-performance multilevel artificial synapses for elements of neuroelectronics and hardware neural networks.

关键词： artificial intelligence neuromorphic systems memristive cross bar resistive switching scanning probe microscopy titanium oxide

Geometric Interpretation of the Origin of the Universe

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Journal of Modern Physics 2022年第2期13卷 89-99页

作者： Bohdan lev Bogolyubov Institute for Theoretical Physics NAS of Ukraine Metrolohichna 14-b Kyiv Ukraine

An approach to the theory of geometrization of the Universe is proposed. The wave function of the Universe is represented by the Clifford number with the transfer rules that have the structure of the Dirac equation for any manifold. Solutions of this equation may be obtained in terms of the geometric interpretation. A new model is proposed that can explain the manifestation of the dark energy and dark matter in the Universe as a geometrical entity with a mechanism involving the spontaneous symmetry breaking.

关键词： Clifford Algebra Wave Function Geometric Interpretation Structural Equations

Critical Equatorial Trajectories of Massless Particles in a Kerr Spacetime

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Journal of High Energy Physics, Gravitation and Cosmology 2022年第3期8卷 647-656页

作者： lev Morgovsky Johann Wolfgang Goethe-Universitä t Frankfurt am Main Frankfurt Germany

In the presented work a closed analytical expression is obtained that describes the critical photon orbits in the equatorial plane of a spinning Kerr black hole (BH). A significant difference in the behavior of photons with prograde and retrograde directions of rotation is shown. The photons with prograde rotation exhibit an exponential increase in the deflection angle together with the number of rotations around the BH as its spin parameter increases. The number of rotations exceeds 103 when spin parameter of the BH reaches 0.999. At the same time this value decreases insignificantly for reverse rotating photons and is less than that for the non-spinning Schwarzschild BH. The transition to a zero spin limit made it possible to determine the number of photon rotations along the critical trajectory for such BHs.

关键词： Black Holes Gravitation Light Deflection Photon Trajectories

Factorizations of Finite Groups and Related Topics

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Algebra Colloquium 2020年第1期27卷 149-180页

作者： lev Kazarin Department of Mathematics Yaroslavl State UniversityRussia

This is a survey on the recent progress in the theory of finite groups with factorizations and around it,done by the author and his coauthors,and this has no pretensions to cover all topics in this wide area of *** particular,we only touch the great consequences of the fundamental paper of Liebeck,Praeger and Saxl on maximal factorizations of almost simple finite groups for the theory of groups with *** each case the reader can find additional references at the end of Section *** of the methods of investigation can be used to obtain information about finite groups in general,nilpotent algebras and related nearrings.

关键词： finite groups products of groups conjugacy classes Sylow subgroups Lie type groups factorizations