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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

A comprehens.v. investigation on nonlinear vibration and bending characteristics of bio-inspired helicoidal laminated composite structures

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Applied Mathematics and Mechanics(English Edition) 2025年第1期46卷 81-100页

作者： s.sAURABH R.KIRAN D.sINGH R.vAIsH v.s.CHAUHAN school of Mechanical and Materials Engineering Indian Institute of Technology Mandi

Bio-inspired helicoidal composite laminates, inspired by the intricate helical structures found in nature, present a promising frontier for enhancing the mechanical properties of structural designs. Hence, this study provides a comprehens.v. investigation into the nonlinear free vibration and nonlinear bending behavior of bio-inspired composite plates. The inverse hyperbolic shear deformation theory(IHsDT) of plates is employed to characterize the displacement field, with the incorporation of Green-Lagrange nonlinearity. The problem is modeled using the C0finite element method(FEM), and an in-house code is developed in the MATLAB environment to solve it numerically. various helicoidal layup configurations including helicoidal recurs.v.(HR), helicoidal exponential(HE), helicoidal semi-circular(Hs), linear helicoidal(LH), and Fibonacci helicoidal(FH)with different layup sequences and quasi-isotropic configurations are studied. The model is.v.lidated, and parametric studies are conducted. These studies investigate the effects of layup configurations, side-to-thickness ratio, modulus ratios, boundary conditions, and loading conditions at different load amplitudes on the nonlinear vibration and nonlinear bending behaviors of bio-inspired composite plates. The results show that the laminate sequence exerts a substantial impact on both nonlinear natural frequencies and nonlinear bending behaviors. Moreover, this influence varies across different side-to-thickness ratios and boundary conditions of the bio-inspired composite plate.

关键词： bio-inspired composite plate finite element method (FEM) Green-Lagrange helicoidal inverse hyperbolic shear deformation theory (IHsDT) nonlinear O322

Unlocking hypoglycemia–associated brain microvascular dysfunction:critical insights from proteomic analysis

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Neural Regeneration Research 2025年第6期20卷 1707-1708页

作者： s.v. s.v.P.sakamuri Anil sakamuri Department of Chemistry Auburn University at MontgomeryMontgomeryALUSA vascular Biology Center and Department of Medicine Medical College of Georgia at Augusta UniversityAugustaGAUSA

Hypoglycemia-a critical complication linked to worsened brain function in diabetic subjects:Hypoglycemia is characterized by a decline in circulatory glucose levels below sta nda rd physiological *** hypoglycemia,classified as level 1 hypoglycemia,is defined by blood glucose levels below 70 mg/dL and can be effectively addressed through carbohydrate *** hypoglycemia,denoted by blood glucose levels less than 54 mg/dL,poses a life-threatening risk if left *** with type 1 and type 2 diabetes undergoing insulin treatment are particularly susceptible to hypoglycemia due to impaired counterregulatory mechanisms.

关键词： impaired intake critical

Photoluminescence upgradation of La_(2)MgTiO_(6):2%Dy^(3+) perovskite with monovalent(Li^(+)),divalent(Ba^(2+),sr^(2+)) and trivalent(Bi^(3+),sm^(3+))cation sensitization

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Journal of Rare Earths 2025年第1期43卷 47-56,I0002页

作者： v.P.veena K.Arun C.K.shilpa s.v.Jasira K.M.Nissamudeen school of Pure and Applied Physics Kannur UniversityPayyanur CampusEdatKannurKrala67 India Department of Nanoscience and Nanotechnology Kannur UniversityPayyanur CampusEdatkannurKerala670327India

Nano phosphors of 2%Dy^(3+)(wt%)doped La_(2)MgTiO_(6) and monovalent/divalent/trivalent co-doped La_(1.98)Dy_(0.02)MgTiO_(6):x%A^(y+)(A^(y+):Li+,Ba^(2+),sr^(2+),Bi^(3+),and sm^(3+);0≤x≤2 wt%)were synthesized by combustion *** the XRD data,it is deduced that an increase in the valency of co-dopant increases the crystallinity of the double perovskite orthorhombic nanocrystal *** an increase in co-dopant size,an elevation in optical bandgap is.v.sible with the highest bandgap of 3.835 ev for Bi^(3+).The photo-absorption is monotonically broadened for sr^(2+),sm^(3+),and Li+around 200-450 ***351 nm,Dy^(3+)triggered lattice shows major characteristic emission peaks at 480 nm(^(4)F_(9/2)→^(6)H_(15/2)),574 nm(^(4)F_(9/2)→^(6)H_(13/2)),and 670 nm(^(4)F_(9/2)→^(6)H_(11/2)).leading to near white light emission with CIE coordinates(0.341,0.376).Upon co-doping,the PL intensity is significantly increased with maximum emission for trivalent sm^(3+),followed by divalent sr^(2+)and monovalent Li+*** increasing excitation wavelength,sr^(2+)shows a dominated output and it is found that divalent sr^(2+)is a potential codopant that could enhance luminescence intensity up to 6 times with a sr^(2+)→Dy^(3+)energy transfer efficiency of 86%.It is specified that the CIE coordinates of Li+co-doped samples show ideal white emission with color coordinates(0.333,0.336).The concluding outcomes signify the noblest rare earth sm^(3+)co-doping and thus sm^(3+)→Dy^(3+)energy transfer mechanism is discussed in detail.

关键词： Photoluminescence Perovskite WLED Co-doping Rareearths

多变量预后模型改善结直肠癌复发预测：PROsPe CT试验

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国际医学放射学杂志 2025年第1期 115-116页

作者： v.Goh s.Mallett v.Boulter R.Glynne-Jones s.Khan s.Lessels 李晗

摘要目的改善预后预测以指导个性化治疗的需求仍未能解决。通过前瞻性研究CT、遗传和免疫组织化学标志物，以改善对结直肠癌复发的预测。方法该多中心试验（Is

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Influence of structural factors on the strength properties of aluminum alloys under shock wave loading

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Matter and Radiation at Extremes 2018年第4期3卷 145-158页

作者： s.v.Razorenov Institute of Problems of Chemical Physics RAs ChernogolovkaRussia National Research Tomsk state University TomskRussia

The results of measurements of the strength characteristics-Hugoniot elastic limit and spall strength of aluminum and aluminum alloys in different structural states under shock wave loading are ***-crystals and polycrystalline technical grade aluminumА1013 and aluminum alloysА2024,АА6063Т6,А1421,A7,А7075,А3003,A5083,АА1070 in the initial coarse-grained state and ultrafine-grained or nanocrystalline structural state were *** refinement of the grain structure was carried out by different methods of s.v.re plastic deformation such as Equal Chanel Angular Pressing,Dynamic Channel Angular Pressing,High-Pressure Torsion and Accumulative *** strength characteristics of shock-loaded samples in different structural states were obtained from the analysis of the evolution of the free surface velocity histories recorded by means of laser Doppler velocimeter *** strain rates before spall fracture of the samples were in the range of 10^(4)-10^(5 )s^(-1),the maximum pressure of shock compression did not exceed 7 *** results of these studies clearly demonstrate the influence of structural factors on the resistance to high-rate deformation and dynamic fracture,and it is much less than under the static and quasi-static loading.

关键词： Aluminum alloys shock wave loading Ultrafine-grained structure Dynamic strength properties

Modeling net-charge fluctuations in heavy-ion collisions at the LHC

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Chinese Physics C 2025年第1期49卷 281-289页

作者： G.O.Ambaryan A.s.Chernyshov G.Kh.Eyyubova v.L.Korotkikh I.P.Lokhtin s.v.Petrushanko A.M.snigirev E.E.Zabrodin Physics Department Lomonosov Moscow State UniversityRU-119991 MoscowRussia skobeltsyn Institute of Nuclear Physics Lomonosov Moscow State UniversityRU-119991 MoscowRussia Bogoliubov Laboratory of Theoretical Physics Joint Institute for Nuclear ResearchRU-141980 DubnaRussia Department of Physics University of OsloN-0316 OsloNorway

Analysis of Pb+Pb data for net-charge fluctuations at LHC energies using the HYDJET++model is *** strongly intens.v. quantities D and Σ were used to remove the effects related to system volume *** employed two versions of HYDJET++for the *** first one is the standard or default version,whereas the second one is a modification that takes into account explicit event-by-event conservation of the electric net-charge of produced *** inclusion of the canonical net-charge conservation in the model allows for better description of the experimental data obtained by the ALICE and CMs Collaborations.A comparison with calculations from other models is also presented.

关键词： relativistic heavy-ion collisions net-charge fluctuations strongly intens.v. variables canonical charge conservation

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v^+注入锐钛矿TiO_2第一性原理研究

物理学报 2007年第8期56卷 4896-4900页

作者：侯兴刚刘安东北京师范大学低能核物理研究所射线束技术与材料改性教育部重点实验室北京市辐射中心北京100875

用金属离子注入方法在锐钛矿TiO2薄膜中掺杂了v+,采用全势线性缀加平面波方法计算了锐钛矿TiO2及v+掺杂TiO2超原胞的电子结构,通过紫外-可见吸收光谱测试方法检测了注入不同剂量的v+对TiO2薄膜吸收光谱的影响.理论计算和实验结果表明,... 详细信息

用金属离子注入方法在锐钛矿TiO2薄膜中掺杂了v+,采用全势线性缀加平面波方法计算了锐钛矿TiO2及v+掺杂TiO2超原胞的电子结构,通过紫外-可见吸收光谱测试方法检测了注入不同剂量的v+对TiO2薄膜吸收光谱的影响.理论计算和实验结果表明,锐钛矿TiO2薄膜注入v+后,带隙宽度变小,吸收光谱发生红移,并且TiO2的带隙宽度随着注入v+剂量的增加而减小.

关键词： v^+注入 TiO2 全势线性缀加平面波方法能带结构

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v^+注入TiO_2光催化薄膜的性能研究

核技术 2007年第8期30卷 647-651页

作者：侯兴刚刘安东教育部射线束技术与材料改性重点实验室北京师范大学低能核物理研究所北京市辐射中心北京100875

采用v+注入方法制备了能够吸收可见光的TiO2薄膜。紫外-可见光谱表明,随着v+注入量的增加,TiO2薄膜的光学带隙宽度减小。对注入后的TiO2薄膜退火可进一步减小光学带隙宽度。荧光光谱和可见光光催化实验表明,v+注入量为1×1016/cm-2时,T... 详细信息

采用v+注入方法制备了能够吸收可见光的TiO2薄膜。紫外-可见光谱表明,随着v+注入量的增加,TiO2薄膜的光学带隙宽度减小。对注入后的TiO2薄膜退火可进一步减小光学带隙宽度。荧光光谱和可见光光催化实验表明,v+注入量为1×1016/cm-2时,TiO2薄膜有最佳可见光光催化降解能力。

关键词： TiO_2薄膜离子注入紫外-可见光谱可见光光催化