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Semantic Segmentation of Lumbar vertebrae Using Meijering U-Net(MU-Net)on Spine Magnetic Resonance Images

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Computer Modeling in Engineering & Sciences 2025年第1期142卷 733-757页

作者： Lakshmi S v v Shiloah Elizabeth Darmanayagam Sunil Retmin Raj Cyril Department of Computer Science and Engineering College of Engineering GuindyAnna UniversityChennai600025India Department of Information technology Madras Institute of TechnologyAnna UniversityChrompetChennai600044India

Lower back pain is one of the most common medical problems in the world and it is experienced by a huge percentage of people *** to its ability to produce a detailed view of the soft tissues,including the spinal cord,nerves,intervertebral discs,and vertebrae,Magnetic Resonance Imaging is thought to be the most effective method for imaging the *** semantic segmentation of vertebrae plays a major role in the diagnostic process of lumbar *** is difficult to semantically partition the vertebrae in Magnetic Resonance Images from the surrounding variety of tissues,including muscles,ligaments,and intervertebral discs.U-Net is a powerful deep-learning architecture to handle the challenges of medical image analysis tasks and achieves high segmentation *** work proposes a modified U-Net architecture namely MU-Net,consisting of the Meijering convolutional layer that incorporates the Meijering filter to perform the semantic segmentation of lumbar vertebrae L1 to L5 and sacral vertebra ***-colour mask images were generated and used as ground truth for training the *** work has been carried out on 1312 images expanded from t1-weighted mid-sagittal MRI images of 515 patients in the Lumbar Spine MRI Dataset publicly available from Mendeley *** proposed MU-Net model for the semantic segmentation of the lumbar vertebrae gives better performance with 98.79%of pixel accuracy(pA),98.66%of dice similarity coefficient(DSC),97.36%of Jaccard coefficient,and 92.55%mean Intersection over Union(mean IoU)metrics using the mentioned dataset.

关键词： Computer aided diagnosis(CAD) magnetic resonance imaging(MRI) semantic segmentation lumbar vertebrae deep learning U-Net model

公交优先条件下小汽车出行向公交转移的预测模型研究(英文)

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交通运输系统工程与信息 2009年第6期9卷 120-129页

作者： vEDAGIRI p. ARASAN v.t. 印度理工学院孟买分校土木工程系印度孟买400076 印度理工学院马德拉斯分校土木工程系印度钦奈600036

研究印度城市道路上设置公交专用道后小汽车出行向公交转移的可能性.借助新的混合交通流仿真模型测定设置公交专用道后公交服务水平改善状况.基于陈述偏好入户调查的抽样数据,本文还引入其他影响出行方式转移的变量,标定出行方式选择二... 详细信息

研究印度城市道路上设置公交专用道后小汽车出行向公交转移的可能性.借助新的混合交通流仿真模型测定设置公交专用道后公交服务水平改善状况.基于陈述偏好入户调查的抽样数据,本文还引入其他影响出行方式转移的变量,标定出行方式选择二元Logit模型.根据实际和预测数据,确定了公交服务水平改善条件下小汽车出行向公交转移的一系列主要影响因素.基于两种方式出行时间差,绘制出行方式转换概率曲线,并为多变量宽值域条件下交通方式转移的预测提供一种易于操作的方法.

关键词：公共交通混合交通流出行时间公交专用道出行方式选择模型

Enthalpy of Mixing of Liquid Al-Cr and Cr-Ni Alloys

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Journal of Materials Science & technology 2002年第2期18卷 167-170页

作者： p.Saltykov v.t.Witusiewicz 等 Max-planck-InstitutfureMetallforschungandUniveristaetStuttgart InstitutfuerNichtmetallischeAnorganischeMaterialienUnversityStuttgartPulvermetallurgischesLaboratoriumHeisenbergstr57056 Max-planck-I

the partial and the integral enthalpies of mixing of liquid Al-Cr and Ni-Cr binary alloys have been determined by high temperature isoperibolic calorimetry at 1723±5 K and 1729±5 K, respectively. the results were analytically described by the thermodynamically adapted power series (tApS). the enthalpies of mixing values for both binary liquid melts are small and negative and in good agreement with the available literature data. Minima of the mixing enthalpies of liquid Al-Cr and Ni-Cr alloys are -7.0 kJ·mol-1 at 46 at. pct Cr and -3.0 kJ·mol-1 at 37 at. pct Cr, respectively.

关键词： Al-Cr Cr-Ni Liquid alloys Enthalpy of mixing Isoperibolic calorimetry

tuning the particle size,physical properties,and photocatalytic activ.t. of Ag_(3)pO_(4)materials by changing the Ag^(+)/pO_(4)^(3-)ratio

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Chinese physics B 2023年第3期32卷 561-568页

作者： Hung N M Oanh L t M Chung D p thang D v Mai v.t.Hang L t Minh N v Center for Nano Science and technology Hanoi National University of Education136 Xuan Thuy RoadCau Giay DistrictHanoi 100000Vietnam Department of physics Hanoi National University of Education136 Xuan Thuy RoadCau Giay DistrictHanoi 100000Vietnam Hanoi University of Mining and Geology Duc Thang WardNorth Tu Liem DistrictHanoi 100000Vietnam Institute of Materials Science Vietnam Academy of Science and Technology18 Hoang Quoc VietHanoi 100000Vietnam Faculty of Basic Sciences Hanoi University of Natural Resources and Environment41 A Phu Dien RoadNorth Tu LiemHanoi 100000Vietnam

this study demonstrates the influence of the Ag^(+)/pO_(4)^(3-)ratio in precursor solution on the crystal structural formation,morphology,physical properties,and photocatalytic performance of a Ag_(3)pO_(4)photocatalyst that is fabricated,using a facile precipitation method,from AgNO_(3)and Na2HpO_(4)·12H_(2)*** material characterizations were carried out using x-ray diffraction(XRD),scanning electron microscopy(SEM),energy-dispersive x-ray spectroscopy(EDX),Brunauer–Emmett–teller(BEt)surface area,Fourier transform infrared(FtIR)absorption,Raman scattering,x-ray photoelectron spectroscopy(XpS),Uv-vis absorption,and photoluminescence(pL).the results show that Ag_(3)pO_(4)crystallizes better when the excess pO_(4)^(3-)content increases,and the lattice parameters decrease slightly,while the crystal diameter and the particle size *** change is also observed in the Raman scattering and FtIR spectra with the increase in the vibration frequency of the[pO_(4)]*** compression of the[pO_(4)]unit was also confirmed in the XpS spectra with the shift of p 2p peaks toward higher binding *** photocatalytic results showed that the samples synthesized from excess pO_(4)^(3-)solution exhibited higher photocatalytic performance compared to the sample with a Ag^(+)/pO_(4)^(3-)ratio of 3:1.A sample prepared from the precursor solution with a Ag^(+)/pO_(4)^(3-)ratio of 3:1.5 was optimal for RhB decomposition under both visible light and natural sunlight,completely decomposing 10 ppm RhB after 15 minutes of xenon lamp irradiation and after 60 minutes under solar light *** is attributed to the high crystallinity,small particle size and low electron–hole recombination rate of the sample.

关键词： morphology photocatalytic Ag^(+)/pO_(4)^(3-)ratio visible light

to deformation vector special solution in mining subsidence and ground and rock movements

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中国有色金属学会会刊：英文版 2005年第S1期15卷 294-298页

作者： v. Sedlák p. Blit'an technical University of Koice Faculty of Mining Ecology Process Control & Geotechnologies Institute of Geodesy & GIS Park Komenského 19 SK-04384 Koice SlovakiaTechnical University of Koice Faculty of Mining Ecology Process Control & Geotechnologies Institute of Geodesy & GIS Park Komenského 19 SK-04384 Koice Slovakia

the paper presents some specific procedures in modelling a deformation vector at deformation investigation of various engineering structures, buildings or terrain surfaces which are exposed by abiotik factors, for example by underground mining activ.t.es or recent geotectonic movements. A specific problem in deformation measurements is solved, when the same conditions of a monitoring network structure cannot be kept during all periodic observ.t.ons.

关键词： deformation vector mathematical modelling geodetic periodic monitoring

Impact of lanthanum on the modification of HfO_2 films structure

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Journal of Rare Earths 2015年第8期33卷 857-862页

作者： t.p.Smirnova L.v.Yakovkina v.O.Borisov Nikolaev Institute of Inorganic Chemistry SB RAS

LaxHf1-xOy thin films with various concentrations of La, homogeneous and nonhomogeneous distributions of elements throughout the films thickness was purposefully grown by CvD. the composition of the films and their chemical structures were characterized throughout the films thickness by X-ray photoelectron spectroscopy （XpS） and energy-dispersive X-ray spectrometry （EDXA）. A full picture of the film crystallinity was provided by the combination of grazing incidence X-ray diffraction （GIXRD） synchrotron radiation （SR） and high resolution transmission electron microscopy （HR tEM）. It was shown that La acted as ＂molar volume modulator＂ and stabilized the nonequilibrium at t≤1300 ℃ cubic phases. the samples with La content in range of 7 at.%〈CLa〈22 at.% were materials with fluorite-type （Fm-3m） structure. the pyroehlore phase formation was observed at -18 at.% La content. the correlation between the La-doped content and the films microstructure was revealed.

关键词： Hf1-xLaxOy films solid solutions X-ray diffraction microstructure rare earths

Electrodeposition of aluminium and aluminium-copper alloys from a room temperature ionic liquid electrolyte containing aluminium chloride and triethylamine hydrochloride

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International Journal of Minerals,Metallurgy and Materials 2013年第9期20卷 909-916页

作者： p.v. Suneesh t.G. Satheesh Babu t. Ramachandran Department of Sciences Amrita School of Engineering Amrita Vishwa Vidyapeetham Amritanagar P. O.Coimbatore - 641112India

the electrodeposition of A1 and A1-Cu binary alloys on to gold substrates from a room temperature ionic liquid electrolyte containing A1C13-EtaNHC1 was studied. the electrochemical behavior of the electrolyte and the mechanism of deposition were investigated through cyclic voltammetry （Cv）, and the properties of deposits obtained were assessed by scanning electron microscopy with energy dispersive X-ray spectroscopy （SEM-EDS） and X-ray diffraction （XRD）. A1 of 70μm in thickness and an A1-Cu alloy of 30μm in thickness with 8at% copper were deposited from the electrolyte. SEM images of the deposits indicate that the A1 deposit was smooth and uniform, whereas the Al-Cu deposit was nodular. the average crystalline size, as determined by XRD patterns, was found to be （30±5） and （29±5） nm, respectively, for A1 and A1-Cu alloys. potentiodynamic polarization （tafel plots） and electrochemical impedance spectroscopic （EIS） measurements showed that Al-Cu alloys are more corrosion resistant than Al.

关键词： electrodeposition aluminium copper alloys ionic liquids triethylamine hydrochloride copper acetylacetonate

Characterization of mixing in an optimized designed t–t mixer with cylindrical elements

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Chinese Journal of Chemical Engineering 2019年第10期27卷 2337-2351页

作者： t.Manoj Dundi v.R.K.Raju v.p.Chandramohan Mechanical Engineering Department National Institute of TechnologyWarangalTelangana StateIndia

passive micromixers are preferred over active mixers for many microfluidic applications due to their relative ease in integration into complex systems and operational *** also incur very low cost of ***,the degree of mixing is comparatively low in passive mixers than active mixers due to the absence of disturbance in the flow by external forces and the inherent laminar nature of microchannel *** designs of complex channel structures and three-dimensional geometries have been investigated in the past to obtain an efficient mixing in passive *** the studies on mixing enhancement with simple planar geometries of passive mixers have been few and *** present work aims to investigate the possibility of mixing enhancement by employing simple planar type designs,such as t-mixer and t–t mixer with cylindrical elements placed in the mixing *** mixing performance has been evaluated in the Reynolds number range of 6 *** results have shown that t–t mixer with cylindrical elements performed significantly well and obtained very good mixing quality over basic t-mixer for the entire range of Reynolds number(6 to 700).the device has also shown better mixing as compared to basic t–t mixer and t-mixer with cylindrical elements.A larger pair of vortices formed in the stagnation area due to the presence of a cylindrical element in the *** elements downstream caused significant enhancement in mixing due to splitting and recombining *** size of the cylindrical element in the t–t mixer has been optimized to obtain better mixing performance of the *** improvement in mixing quality by t–t mixer with cylindrical elements has been obtained at the expense of small rise in pressure drop as compared to other passive designs considered in this ***,the current design of t–t mixer with cylindrical elements can act as an effective and simple passive mixing device for various mi

关键词： CFD-simulation Cylindrical elements Micromixers Mixing quality Obstructions t–t-mixer

Suppression of Ambipolar Conduction in Schottky Barrier Carbon Nanotube Field Effect transistors:Modeling,Optimization Using particle Swarm Intelligence,and Fabrication

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Computer Modeling in Engineering & Sciences 2019年第6期119卷 577-591页

作者： p.Reena Monica v.t.Sreedevi School of Electronics Engineering VIT ChennaiVandalur-Kelambakkam RoadChennai603103India School of Electrical Engineering VIT ChennaiVandalur-Kelambakkam RoadChennai603103India

A mathematical model and experimental analysis of the impact of oxide thickness on the ambipolar conduction in Schottky Barrier Carbon Nanotubes(CNts)Field Effect transistor(SB CNtFEts)is *** of ambipolar conduction in SB CNtFEts is imperative in order to establish them as the future of IC *** ambipolar nature of SB CNtFEts leads to a great amount of leakage *** a gate oxide dielectric of thickness,tox^50 nm suppresses the ambipolar *** an SB CNtFEt,it is the electric field at the source/drain contacts that control the conductance and the band bending length at the contacts is defined by ***,tox is the prime parameter that influences the width of the Schottky barrier and the current in the subthreshold *** to the wide SB,there is a loss in on-current due to tunneling,but the current due to thermionic emission is increased by employing a high-κdielectric such as Zirconium dioxide(ZrO2).this work proposes an approach to suppress ambipolar behavior in SB CNtFEts without decreasing the on *** thickness and dielectric constant of the gate oxide are optimized using the particle swarm optimization(pSO)algorithm to achieve suppression of ambipolar conduction without any loss in *** proposed SB CNtFEt was modeled using *** demonstration of the suppression of ambipolar property is also *** SB CNtFEts are fabricated using high-κdielectric such as ZrO2 with different thickness.A device with thin(~5 nm)gate oxide and another device with thick(~50 nm)gate oxide were *** the experimental results,it is observed that the device with the thin gate oxide exhibited ambipolar characteristics and the device with the thick gate oxide did not exhibit ambipolar *** increase in thickness,tox,ensures suppression of ambipolar behavior.

关键词： Ambipolar conduction Carbon nanotubes high-κgate oxide Schottky barrier