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Efficient Simplification Methods for Generating High Quality LOds of 3d Meshes

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Journal of Computer Science & Technology 2009年第3期24卷 604-612,F0003页

作者： Muhammad hussain department of Computer Science King Saud University

Two simplification algorithms are proposed for automatic decimation of polygonal models, and for generating their LOds. Each algorithm orders vertices according to their priority values and then removes them iteratively. For setting the priority value of each vertex, exploiting normal field of its one-ring neighborhood, we introduce a new measure of geometric fidelity that reflects well the local geometric features of the vertex. After a vertex is selected, using other measures of geometric distortion that are based on normal field deviation and distance measure, it is decided which of the edges incident on the vertex is to be collapsed for removing it. The collapsed edge is substituted with a new vertex whose position is found by minimizing the local quadric error measure. A comparison with the state-of-the-art algorithms reveals that the proposed algorithms are simple to implement, are computationally more efficient, generate LOds with better quality, and preserve salient features even after drastic simplification. The methods are useful for applications such as 3d computer games, virtual reality, where focus is on fast running time, reduced memory overhead, and high quality LOds.

关键词： polygonal models simplification LOd modeling multi-resolution modeling

Biochemical dissection of STAT3 signaling in amyotrophic lateral sclerosis

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Neural Regeneration Research 2025年第11期20卷 3229-3230页

作者： Savina Apolloni Nadia d’Ambrosi department of Biology University of Rome Tor VergataRomeItaly

Amyotrophic lateral sclerosis(ALS)is a progressive neurodegenerative disease characterized by the loss of upper and lower motor neurons,clinically marked by muscle atrophy and *** the clinical course is highly variable,the average time from the onset of symptoms to the need for respiratory support or death is 3-5 *** is the most prevalent motor neuron disease in adults,occurring at a rate of 2 per 100,000 individuals and affecting 5.4 per 100,000 individuals overall.

关键词： STAT3 dissection sclerosis

Anti-amyloid antibodies in Alzheimer’s disease: what did clinical trials teach us?

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Neural Regeneration Research 2025年第4期20卷 1092-1093页

作者： danko Jeremic Lydia Jiménez-díaz Juan d.Navarro-López NeuroPhysiology&Behavior Lab University of Castilla-La ManchaBiomedical Research Center(CRIB)School of Medicine of Ciudad RealCiudad RealSpain

Although many causes of Alzheimer’s disease(Ad)may exist,both the original amyloid cascade and tau hypotheses posit that abnormal misfolding and accumulation of amyloid-β(Aβ)and tau protein is the central event causing the ***,that conclusion could be only partly true,and there is conflicting evidence about the role of both proteins in Ad,being able to precede and influence one *** researchers argue that these proteins are mere executors rather than primary causes of ***,there have been continuing refinements of both hypotheses,with alternative explanations proposed.Aβand tau proteins may be independently involved in specific neurotoxic pathways;yet there may be other crucial processes going on in early ***,accumulating evidence suggests that Aβand tau act synergistically,rather than additively in disease onset(Jeremic et al.,2021,2023a).

关键词： amyloid Alzheimer additive

Remaking a connection:molecular players involved in post-injury synapse formation

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Neural Regeneration Research 2025年第6期20卷 1719-1720页

作者： diogo Tomé Ramiro d.Almeida iBiMEd-Institute of Biomedicine Department of Medical SciencesUniversity of AveiroAveiroPortugal CNC-Center for Neuroscience and Cell Biology University of CoimbraCoimbraPortugal

Functional recovery from central nervous system(CNS)trauma depends not only on axon regeneration or compensatory sprouting of uninjured fibers but also on the ability of newly grown axons to establish functional synapses with appropriate *** several studies have successfully promoted long-distance axonal regeneration in distinct CNS injury models,none of them have resulted in a viable therapeutic approach for patient recovery.A possible reason may be the lack of new synaptogenesis for reestablishing the circuitry lost after ***,we discuss how our understanding of the mechanisms that instruct synapse formation in the injured nervous system may contribute to the design of new strategies to promote functional restoration in traumatic CNS disorders.

关键词： viable injury instru

Effect of Temperature and Ionic Concentration on Self-Assembled Films of Chicago Sky Blue

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Chinese Physics Letters 2008年第10期25卷 3732-3734页

作者： d. dey M. N. Islam S. A. hussain d. Bhattacharjee department of Physics Tripura University Suryamaninagar-799130 Tripura India

We employ a layer-by-layer adsorption technique for deposition on solid substrates of polyionic films of Chicago Sky Blue. Film growth was significant with the increasing number of layers. Photochemical properties of these films are investigated for different ionic concentrations. A significant blue shift is observed with the increasing ionic strength of the solution, suggesting the formation of aggregation. Temperature effect studies show some preferable reorientation of molecules in the film during cooling process. Most remarkable observation is that the absorption intensity is the highest for a particular degree of inclination. deposition time is fixed at 15rain because adsorption kinetics results show saturation after 15 min.

关键词： the power-law exponents precipitation durative abrupt precipitation change

Miscibility and Molecular Orientation of Carbazole in Mixed Langmuir and Langmuir-Blodgett Films

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Chinese Physics Letters 2007年第7期24卷 2044-2047页

作者： Md. N. Islam d. Bhattachaxjee S. A. hussain department of Physics Tripura University Suryamaninagar-799130 Tripura India

We report the miscibility and molecular orientation of carbazole （CA） molecules in the mixed Langmuir and Langmuir-Blodgett （LB） films of CA in polymethyl methacrylate （PMMA） and stearic acid （SA） matrices. The lr-A isotherm confirms the formation of stable Langmuir films of CA mixed with either PMMA or SA at airwater interface. ＇Characteristics of area per molecule versus molefraction and collapse pressure versus molefraction reveal complete demixing of CA and the matrix PMMA/SA molecules in the mixed films. Absorption spectroscopy certainly confirms the fact that CA molecules have preferred orientation on the substrate of the LB films.

关键词： ELECTROLUMINESCENT dEVICES ENERGY-TRANSFER

Results of single stage exchange arthroplasty with retention of well fixed cement-less femoral component in management of infected total hip arthroplasty

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World Journal of Orthopedics 2017年第3期8卷 264-270页

作者： Wael A Rahman hussain A Kazi Jeffery d Gollish Orthopaedic department Mansoura University Holland Orthopaedic and Arthritic Centre Sunnybrook Health Sciences Centre Mid Cheshire Hospitals NHS Foundation Trust Leighton Hospital

AIM To investigate success of one stage exchange with retention of fixed acetabular *** Fifteen patients treated by single stage acetabular component exchange with retention of well-fixed femoral component in infected total hip arthroplasty(THA)were retrospectively *** criteria were patients with painful chronic infected total *** patient had radiologically well fixed femoral components,absence of major soft tissue or bone defect compromising,and infecting organism was not poly or virulent *** organisms were identified preoperatively in14 patients(93.3%),coagulase negative Staphylococcus was the infecting organism in 8 patients(53.3%).RESULTS Mean age of the patients at surgery was 58.93(±10.67)*** follow-up was 102.8 mo(36-217 mo,Sd56.4).Fourteen patients had no recurrence of the infection;one hip(6.7%)was revised for management of *** analysis using Kaplan Meier curve showed 93.3%survival *** failure in our series;the infection recurred after 14 mo,the patient was treated successfully with surgical intervention by irrigation,and debridement and liner *** complications:The first patient had recurrent hip dislocation 12 years following the definitive procedure,which was managed by revision THA with abductor reconstruction and constrained acetabular liner;the second complication was aseptic loosening of the acetabular component 2years following the definitive *** Successful in management of infected THA when following criteria are met;well-fixed stem,no draining sinuses,non-immune compromised patients,and infection with sensitive organisms.

关键词： Total hip arthroplasty Infection One stage exchange Complication

Enhancing dielectric and Mechanical Behaviors of Hybrid Polymer Nanocomposites Based on Polystyrene,Polyaniline and Carbon Nanotubes Coated with Polyaniline

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Chinese Journal of Polymer Science 2016年第12期34卷 1500-1509页

作者： Tanveer ul Haq Zia Ahmad Nawaz Khan Majid hussain Ibrar Hassan Iftikhar hussain Gul department of Materials Engineering School of Chemical and Materials EngineeringNational University of Sciences and Technology

The dielectric and mechanical properties of hybrid polymer nanocomposites of polystyrene/polyaniline/carbon nanotubes coated with polyaniline （pCNTs） have been investigated using impedance analyzer and extensometer. The blends of PS/PANI formed the heterogeneous phase separated morphology in which pCNTs are dispersed uniformly. The incorporation of a small amount of pCNTs into the blend of PS/PANI has remarkably increased the dielectric properties. Similarly, the AC conductivity of PS/PANI is also increased five orders of magnitude from 1.6 × 10^-10 to 2.0×10^-5 ***-1 in the hybrid nanocomposites. Such behavior of hybrid nanocomposites is owing to the interfacial polarization occurring due to the presence of multicomponent domains with varying conductivity character of the phases from insulative PS to poor conductor PANI to highly conductive CNTs. Meanwhile, the tensile modulus and tensile strength are also enhanced significantly up to 55% and 160%, respectively, without much loss of ductility for three phase hybrid nanocomposites as compared to the neat PS. Thereby, the hybrid nanocomposites of PS/PANI/pCNTs become stiffer, stronger and tougher as compared to the neat systems.

关键词： Nanocomposites Carbon nanotubes dielectric behavior Mechanical properties Polystyrene.

Zero group velocity longitudinal modes in an isotropic cylinder

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Acta Mechanica Sinica 2018年第3期34卷 475-481页

作者： Takasar hussain Faiz Ahmad Muhammad Ozair department of Mathematics COMSATS Institute of Information Technology School of Natural Sciences National University of Sciences and Technology

Zero group velocity （ZGV） modes are studied in an isotropic cylinder. The L （0, 2） mode behaves anomalously for the materials with a value of the bulk velocity ratio, to, in the range √2 〈 κ 〈 2.64 and normally otherwise. All higher modes, except the first few, have no ZGV point for all isotropic materials. This is explained analytically by finding the slope of phase velocity dispersion curves of modes first when the phase velocity equals κ and then at their initial state.

关键词： Isotropic cylinder Longitudinal modes Zerogroup velocity point