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Correction method for moderate and severe degrees of hallux valgus associated with transfer metatarsalgia

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World Journal of Orthopedics 2024年第3期15卷 238-246页

作者： Amangasy Zhanaspayev Nurlan Bokembayev marat Zhanaspayev Aidos Tlemissov Sabina Aubakirova Alexander Prokazyuk Department of Traumatology and Orthopaedics The National Scientific Center of Traumatology and Orthopaedics Named after Academician Batpenov NDAstana 010000Kazakhstan Department of Traumatology and Paediatric Surgery Non-Commercial Joint-Stock Company“Semey Medical University”Semey 071400Kazakhstan Department of Habilitation and Rehabilitation Center of Habilitation and Rehabilitation of Persons with Disabilities of the Abai RegionSemey 071400Kazakhstan Department of Anaesthesiology and Resuscitation Center of Nuclear Medicine and OncologySemey 071400Kazakhstan

BACKGROUND Hallux valgus(HV)is a common foot deformity that manifests with increasing age,especially in *** associated foot pain causes impaired gait and decreases quality of *** and severe HV is a deformity that is charac-terized by the involvement of lesser rays and requires complex surgical *** this study,we attempted to develop a procedure for this *** To analyse the treatment results of patients who underwent simultaneous surgical correction of all parts of a static forefoot *** We conducted a prospective clinical trial between 2016 and 2021 in which 30 feet with moderate or severe HV associated with Tailor’s bunion and metatarsalgia were surgically treated via a new method involving surgical correction of all associated *** method included a modified Lapidus procedure,M2M3 tarsometatarsal arthrodesis,intermetatarsal fusion of the M4 and M5 bases,and the use of an original external fixation apparatus to enhance correction ***,postoperative,and final follow-up radiographic data and American Orthopaedic Foot and Ankle Society(AOFAS)scores were compared,and P values<0.05 were considered to indicate statistical *** The study included 28 females(93.3%)and 2 males feet(6.7%),20(66.7%)of whom had a moderate degree of HV and 10(33.3%)of whom had severe deformity.M2 and M3 metatarsalgia was observed in 21 feet,and 9 feet experienced pain only at *** mean follow-up duration was 11 *** patients had good correction of the HV angle[preoperative median,36.5 degrees,interquartile range(IQR):30-45;postoperative median,10 degrees,IQR:8.8-10;follow-up median,11.5 degrees,IQR:10-14;P<0.01].At follow-up,metatarsalgia was resolved in most patients(30 vs 5).There was a clinically negligible decrease in the corrected angles at the final follow-up,and the overall AOFAS score was significantly better(median,65 points,IQR:53.8-70;vs 80 points,IQR:75-85;P<0.01).CONCLUSION The developed me

关键词： Hallux valgus Metatarsalgia Tailor’s bunion Lapidus procedure Proximal metatarsal osteotomy Splayfoot

Thermal conductivity suppression in uranium-doped thorium dioxide due to phonon-spin interactions

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Journal of Materiomics 2024年第3期10卷 709-715页

作者： Zilong Hua Saqeeb Adnan Amey R.Khanolkar Karl Rickert David B.Turner Timothy A.Prusnick J.Matthew Mann David H.Hurley marat Khafizov Cody A.Dennett Materials Science and Engineering Department Idaho National LaboratoryIdaho FallsID83415USA Department of Mechanical and Aerospace Engineering The Ohio State UniversityColumbusOH43210USA KBR DaytonOH45431USA Azimuth Corporation FairbornOH45324USA Air Force Research Laboratory Wright-Patterson AFBOH45433USA Department of Nuclear Science and Engineering Massachusetts Institute of TechnologyCambridgeMA02139USA

In this work,impact of low level of uranium(U)atom substitution on thermal conductivity of thorium dioxide(ThO_(2))is ***_(2)is an electronic insulator with a wide optical band-gap and no unpaired electrons whose thermal transport is governed by phonons.U-substitution introduces unpaired f-electrons resulting in paramagnetic behavior of UeThO_(2)at room temperature,which significantly suppresses its thermal conductivity.A single crystal of UeThO_(2)with graded composition of U is grown using a hydrothermal synthesis method,and thermal conductivity measurements are performed in re-gions with uniform composition of U at levels of 0%,6%,9%and 16%.Measured thermal conductivity profiles over 77e300 K temperature range are analyzed using an analytical expression for phonon-mediated thermal transport based on Klemens-Callaway *** dependent thermal con-ductivity is found to deviate significantly from the Rayleigh scattering trend expected for a simple substitutional point defect with a small perturbation to mass and interatomic *** the resonant scattering term,observed large suppression of thermal conductivity at low temperatures can be closely ***,the extracted phonon-spin coupling constants imply a nonlinear relation of phonon-spin interaction intensity with respect to U doping *** study reveals how phonon-spin scattering contributed by unpaired f-electrons in U atoms influences thermal transport in the UeThO_(2)system.

关键词： Phonon-spin interactions Thermal conductivity UdThO_(2)system

Ignition of Hydrocarbon-Air Supersonic Flow by Volumetric Ionization

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Journal of Thermal Science 2015年第6期24卷 583-590页

作者： marat A.Goldfeld George A.Pozdnyakov Khristianovich Institute of Theoretical and Applied Mechanics SB RAS

The paper describes the results of the electron-beam initiation of the combustion in the mixtures of hydrogen,natural gas or kerosene vapors with *** beam characteristics were studied in closed volume with immobile *** researches included definition of an integrated current of an electronic beam,distribution of a current density and an estimation of average energy of *** of fuel mixtures ignition by means of this approach in the combustor at high velocity at the entrance was *** were carried out at Mach numbers of 4 and *** of ignition and combustion under electron beam action was *** was revealed that ignition of mixture occurs after completion of electron gun *** obtained have confirmed effectiveness of electron beam application for ignition of hydrogen and natural *** numerical simulation of the combustion of mixture in channel was carried out by means of ANSYS CFD 12.0 instrumentation on the basis of Reynolds averaged Navier-Stokes equation using SST/k-ωturbulence *** combustion modeling,a detailed kinetic scheme with 38 reactions of 8 species was implemented taking into account finite rate *** have shown that the developed model allow to predict ignition of a mixture and flame propagation even at low flow temperatures.

关键词： supersonic flow combustor electron bean ignition delay numerical simulation.

Treatment strategies in obstructed defecation and fecal incontinence

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World Journal of Gastroenterology 2006年第20期12卷 3168-3173页

作者： marat Khaikin Steven D Wexner Department of Colorectal Surgery Cleveland Clinic Florida WestonFL 33331United States

Obstructed defecation （OD） and fecal incontinence （FI） are challenging clinical problems, which are commonly encountered in the practice of colorectal surgeons and gastroenterologists. These disorders sodally and psychologically distress patients and greatly impair their quality of life. The underlying anatomical and pathophysiological changes are complex, often incompletely understood and cannot always be determined. As a consequence, many medical, surgical, and behavioral approaches have been described, with no panacea. Over the past decade, advances in an understanding of these disorders together with rational and similar methods of evaluation in anorectal physiology laboratories （ARP）, radiology studies, and new surgical techniques have led to promising results. In this brief review, we discuss treatment strategies and recent updates on clinical and therapeutic aspects of obstructed defecation and fecal incontinence.

关键词： Obstructed defecation Fecal incontinence Treatment

Skin Friction Gage for Measurements in Hypersonic Flow

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Journal of Thermal Science 2003年第1期12卷 44-50页

作者： Francois Falempin marat Goldfeld Roman Nestoulia EADS Aerospatiale Matra Missiles ChatillonInstitute of Theoretical and Applied Mechanics NovosibirskInstitute of Theoretical and Applied Mechanics Novosibirsk France Russia Russia

A description and results of tests of a new small-scale gage for direct measurement of skin friction force are presented in the *** gage design provides separated measurement of longitudinal and transversal component of friction *** of this scheme provides high sensitivity and necessary high-frequency response of the *** tests of the gage were carried out in a blow down wind tunnel at Mach numbers of 2 and 4 within the range of Reynolds numbers Rex from 0.8 to 5 million and in the hot-shot wind tunnel at Mach number 6 and Reynolds numbers Rex=2.5-10 *** measurements of skin friction were carried out on a flat plate and on a ramp beyond the shock *** with the direct measurement of friction in the blow down wind tunnel,the measurements of profiles of average velocities and mass flow rate pulsations were *** of measurement errors has shown that the friction gage permits to measure skin friction coefficient on a flat plate with mistake not more than 10%.

关键词： skin friction gage hypersonic flow scramjet.

The Research of Laminar-Turbulent Transition in Hypersonic Three-Dimensional Boundary Layer

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Journal of Thermal Science 2005年第2期14卷 103-107页

作者： marat A.GOLDFELD Evgeniy V.ORLIK Institute of Theoretical and Applied Mechanics 4/1 Institutskaya Str. Novosibirsk 630090RussiaInstitute of Theoretical and Applied Mechanics 4/1 Institutskaya Str.Novosibirsk 630090Russia

The results of experimental investigation of laminar-turbulent transition in three-dimensional flow under the high continuous pressure gradient including the flow with local boundary layer separation are presented. The experimental studies were performed within the Mach number range from 4 to 6 and Reynolds number 10-60×106 1/m, the angles of attack were 0° and 5°. The experiments were carried out on the three-dimensional convergent inlet model with and without sidewalls. The influence of artificial tubulator of boundary layer on transition and flow structure was studied. The conducted researches have shown that adverse pressure gradient increase hastens transition and leads to decrease of transition area length. If pressure gradient rises velocity profile fullness increases and profile transformation from laminar to turbulent occurs. As a result of it the decrease of separation area length occurs. The same effect was reached with Reynolds number increase. These results are compared with the data on two-dimensional model with longitudinal curvature.

关键词： hypersonic boundary layer transition convergent inlet adverse pressure gradient.

High cyclic fatigue performance of Al-Cu-Mg-Ag alloy under T6 and T840 conditions

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Transactions of Nonferrous Metals Society of China 2017年第6期27卷 1215-1223页

作者： marat GAZIZOV Rustam KAIBYSHEV Belgorod State University Pobeda 85 Belgorod 308015 Russia

High cyclic fatigue(HCF)behavior of an AA2139alloy belonging to Al-Cu-Mg-Ag system in T6and T840conditionswas *** T840treatment involving cold rolling with a40%reduction prior to peak ageing provides an increase in tensilestrength compared with the ***,fatigue lifetime for two material conditions was nearly the same since there isweak effect of thermomechanical processing on micro-mechanisms of crack initiation and growth.

关键词： Al-Cu-Mg-Ag alloy thermomechanical processing microstructure fatigue life fractography

Surface and Subsurface Defects Studies of Dental Alloys Exposed to Sandblasting

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Acta Metallurgica Sinica(English Letters) 2019年第10期32卷 1181-1194页

作者： Krzysztof Siemek Miroslaw Kulik marat Eseev Miroslaw Wrobel Andrey Kobets Oleg Orlov Alexey Sidorin Joint Institute for Nuclear Research Joliot-Curie 6 Dubna Moscow Region Russian Federation 141980 Institute of Nuclear Physics PAS E. Radzikowskiego 152 31-342 Krakow Poland Institute of Physics Maria Curie-Sklodowska University pl. M. Curie-Skiodowskiej 1 20-031 Lublin Poland Northern Arctic Federal University Severnaya Dvina Emb. 17 Arkhangelsk Russian Federation 163002 AGH University of Science and Technology 30 Mickiewicza Ave 90-059 Krakow Poland Institute of Electrophysics and Radiation Technologies NAS of Ukraine Chernyshevsky St. 2& Kharkiv 61002 Ukraine

The defects created in commercial dental alloys during blasting with alumina particles propelled in compressed air under pressure 0.1 and 0.4 MPa have been studied using positron annihilation spectroscopy, scanning electron microscopy and X-ray diffraction. It was observed that higher pressure causes the increase in roughness and damaged zone range. The type of defects was determined as vacancies on dislocations. The defect concentration decreases with the depth and depends on alloys' type and applied pressure. The Rutherford backscattering spectroscopy and variable energy positron beam studies indicate shallow alumina deposition in material and show that small pressure of 0.1 MPa is not enough to remove metal surface oxides completely in 60 s in all studied dental alloys.

关键词： Sandblasting Positron annihilation technique Dental alloys Defects analysis Oxides

On Quantum Methods for Machine Learning Problems Part Ⅱ: Quantum Classification Algorithms

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Big Data Mining and Analytics 2020年第1期3卷 56-67页

作者： Farid Ablayev marat Ablayev Joshua Zhexue Huang Kamil Khadiev Nailya Salikhova Dingming Wu the College of Computer Science&Software Engineering Shenzhen UniversityShenzhen 518000China the Kazan Federal University Kazan 42008Russia

This is a review of quantum methods for machine learning problems that consists of two *** first part,"quantum tools",presented some of the fundamentals and introduced several quantum tools based on known quantum search *** second part of the review presents several classification problems in machine learning that can be accelerated with quantum *** have chosen supervised learning tasks as typical classification problems to illustrate the use of quantum methods for classification.

关键词： quantum classification binary classification nearest neighbor algorithm