检索结果-南通市图书馆

Image Splicing Detection Based on Texture Features with Fractal Entropy

在线全文

维普期刊数据库

学校读者我要写书评

暂无评论

Computers, materials & Continua 2021年第12期69卷 3903-3915页

作者： razi J.Al-Azawi Nadia m.G.Al-Saidi Hamid A.Jalab Rabha W.Ibrahim Dumitru Baleanu Department of Laser and Optoelectronics Engineering University of TechnologyBaghdad10066Iraq Department of Applied Sciences University of TechnologyBaghdad10066Iraq Department of Computer System and Technology Faculty of Computer Science and Information TechnologyUniversiti MalayaKuala Lumpur50603Malaysia IEEE:94086547 Kuala Lumpur59200Malaysia Department of mathematics Cankaya UniversityBalgat06530AnkaraTurkey Institute of Space Sciences R76900 Magurele-BucharestRomania Department of medical Research China Medical UniversityTaichung40402Taiwan

Over the past years,image manipulation tools have become widely accessible and easier to use,which made the issue of image tampering far more *** a direct result to the development of sophisticated image-editing applications,it has become near impossible to recognize tampered images with naked ***,to overcome this issue,computer techniques and algorithms have been developed to help with the identification of tampered *** on detection of tampered images still carries great *** the present study,we particularly focus on image splicing forgery,a type of manipulation where a region of an image is transposed onto another *** proposed study consists of four features extraction stages used to extract the important features from suspicious images,namely,Fractal Entropy(FrEp),local binary patterns(LBP),Skewness,and *** main advantage of FrEp is the ability to extract the texture information contained in the input ***,the“support vector machine”(SVm)classification is used to classify images into either spliced or *** analysis shows that the proposed algorithm performs better than recent state-of-the-art of splicing detection ***,the proposed algorithm achieves an ideal balance between performance,accuracy,and efficacy,which makes it suitable for real-world applications.

关键词： Fractal entropy image splicing texture features LBP SVm

Turbulent Kinetic Energy of Flow during Inhale and Exhale to Characterize the Severity of Obstructive Sleep Apnea Patient

在线全文

维普期刊数据库

学校读者我要写书评

暂无评论

Computer modeling in Engineering & Sciences 2023年第7期136卷 43-61页

作者： W.m.Faizal C.Y.Khor muhammad Nooramin Che Yaakob N.N.N.Ghazali m.Z.Zainon Norliza Binti Ibrahim Roziana mohd razi Faculty of mechanical Engineering&Technology University Malaysia PerlisPadang Besar02100Malaysia Department of mechanical Engineering Faculty of EngineeringUniversity of MalayaKuala Lumpur50603Malaysia Department of Oral&maxillofacial Clinical Science Faculty of DentistryUniversity of MalayaKuala Lumpur50603Malaysia Department of Paediatric Dentistry and Orthodontics Faculty of DentistryUniversity of MalayaKuala Lumpur50603Malaysia

This paper aims to investigate and present the numerical investigation of airflow characteristics using Turbulent Kinetic Energy(TKE)to characterize the upper airway with obstructive sleep apnea(OSA)under inhale and exhale breathing *** importance of TKE under both breathing conditions is that it showan accuratemethod in expressing the severity of flow in sleep *** fluid dynamics simulate the upper airway’s airflow via steady-state Reynolds-averaged Navier-Stokes(RANS)with k–ωshear stress transport(SST)*** three-dimensional(3D)airway model is created based on the CT scan images of an actual patient,meshed with 1.29 million elements using materialise Interactive medical Image Control System(mImICS)and ANSYS software,*** TKE were noticed around the region after the necking(smaller cross-sectional area)during the inhale and exhale *** turbulent kinetic energy could be used as a valuablemeasure to identify the severity of *** study is expected to provide a better understanding and clear visualization of the airflow characteristics during the inhale and exhale breathing in the upper airway of patients for medical practitioners in the OSA research field.

关键词： Obstructive sleep apnea breathing disorders real patient CFD turbulent kinetic energy

Computational Analysis of Airflow in Upper Airway under Light and Heavy Breathing Conditions for a Realistic Patient Having Obstructive Sleep Apnea

在线全文

维普期刊数据库

学校读者我要写书评

暂无评论

Computer modeling in Engineering & Sciences 2021年第8期128卷 583-604页

作者： W.m.Faizal N.N.N.Ghazali C.Y.Khor m.Z.Zainon Irfan Anjum Badruddin Sarfaraz Kamangar Norliza Binti Ibrahim Roziana mohd razi Faculty of mechanical Engineering Technology University Malaysia PerlisPerlisMalaysia Department of mechanical Engineering Faculty of EngineeringUniversity of MalayaKuala Lumpur50603Malaysia Research Center for Advanced materials Science King Khalid UniversityAbha61413Saudi Arabia Department of mechanical Engineering College of EngineeringKing Khalid UniversityAbha61421Saudi Arabia Department of Oral&maxillofacial Clinical Science Faculty of DentistryUniversity of MalayaKuala Lumpur50603Malaysia Department of Paediatric Dentistry and Orthodontics Faculty of DentistryUniversity of MalayaKuala Lumpur50603Malaysia

Background:Obstructive sleep apnea is a sleeping disorder that has troubled a sizeable *** is an active area of research on obstructive sleep apnea that intends to better understand airflow behaviors and therefore treat patients more *** paper aims to investigate the airflow characteristics of the upper airway in an obstructive sleep apnea(OSA)patient under light and heavy breathing conditions by using Turbulent Kinetic Energy(TKE),an accurate method in expressing the flow concentration mechanisms of sleeping *** is important to visualize the concentration of flow in the upper airway in order to identify the severity level of the obstruction during ***:Computational fluid dynamic(CFD)analysis was used as a solution tool to evaluate the airflow during light and heavy breathing conditions.A medical imaging technique was used to extract the 3D model from the CT scan ***,mesh generation and simulation were carried out via CFD software to evaluate the light and heavy breathing characteristics related to obstructive sleep *** state Reynold’s averaged Navier-Stoke(RANS)with the k-ωshear stress transport(SST)turbulence model was *** airflow characteristics were quantified using parameters such as pressure distribution,skin friction coefficient,velocity profile,Reynolds number,turbulent Reynolds number and turbulence kinetic ***:Contour plots at different planes were used to visualize the airflow distribution as it passed through different cross-sectional areas of the *** results revealed that the presence of a smaller cross-sectional area of the airway caused an increase in airflow parameters,especially during heavy ***,turbulent airflow conditions along the airway were noticed during heavy *** severity of OSA could be measured by the turbulent kinetic energy which is able to show the behavior and concentration of mean *** study is expected to p

关键词： Human upper airway computational fluid dynamics obstructive sleep apnea turbulent kinetic energy

Analysis of Demagnetizer Operation Using the Finite Element method

在线全文

维普期刊数据库

学校读者我要写书评

暂无评论

Journal of Energy and Power Engineering 2010年第2期4卷 58-64页

作者： N. morovvati H. Feshki Farahani m. Sabaghi S.m. Pedram.razi Islamic Azad University Ashtian Branch Ashtian Iran Laser and Optics Research Center NSTRI Tehran Iran Islamic Azad University Tehran South Branch Tehran Iran

Permanent magnets with high energy products are widely used in a variety of electromagnetic devices. Such devices can be found in marine, aerospace, and robotic applications which require the minimization of weight and volume of the electromagnetic device. During the magnetizing process, the magnet may not be perfectly magnetized. Therefore, it needs to be demagnetized. Because of high coercivity of some permanent magnets, the demagnetization process requires the intense magnetic fields in close proximity with the magnetic material. The fields must be produced for a short period of time （millisecond range） and they also must be bidirectional in order to overcome the coercivity of magnetic material. Different parameters have been known to affect the demagnetizer operation such as the core shape, core material, turn number, cross section of air gap, magnet type and so on. The amplitude and waveform of the fixture current is obtained from PSPICE simulations and also from experimental measurement. A 2D finite element analysis is developed to simulate the magnetic fields and the mechanical forces. In this paper, the main parameters affecting the optimal design of the demagnetizer are discussed. Simulation results show that the core structure, air gap width, and turn numbers are the most important parameters when designing such a device.

关键词： Demagnetizer effective parameters fixture finite element method ANSYS software.

Long-Term Land Deformation monitoring Using Quasi-Persistent Scatterer (Q-PS) Technique Observed by Sentinel-1A: Case Study Kelok Sembilan

在线全文

维普期刊数据库

学校读者我要写书评

暂无评论

Advances in Remote Sensing 2018年第4期7卷 277-289页

作者： Pakhrur razi Josaphat Tetuko Sri Sumantyo Daniele Perissin Hiroaki Kuze Physics Department Universitas Negeri Padang Sumatra Indonesia Center for Environmental Remote Sensing Chiba University Chiba Japan Lyle School of Civil Engineering Purdue University West Lafayette IN USA

Located on the mountainous area, Kelok Sembilan flyover area in West Sumatra, Indonesia has a long history of land deformation, therefore monitoring and analyzing as continuously is a necessity to minimize the impact. Notably, in the rainy season, the land deformation occurs along this area. The zone is crucial as the center of transportation connection in the middle of Sumatra. Quasi-Persistent Scatterer (Q-PS) Interferometry technique was applied for extracting information of land deformation on the field from time to time. Not only does the method have high performance for detecting land deformation but also improve the number of PS point, especially in a non-urban area. This research supported by 90 scenes of Sentinel-1A (C-band) taken from October 2014 to November 2017 for ascending and descending orbit with VV and VH polarization in 5 × 20 m (range × azimuth) resolution. Both satellite orbits detected two critical locations of land deformation namely as zone A and Zone B, which located in positive steep slope where there is more than 500 mm movement in the Line of Sight (LOS) during acquisition time. Deformations in the vertical and horizontal direction for both zone, are 778.9 mm, 795.7 mm and 730.5 mm, 751.7 mm, respectively. Finally, the results were confirmed by ground truth data using Unmanned Aerial Vehicle (UAV) observation.

关键词： Interferometry Synthetic Aperture Radar Land Deformation Q-PS Technique Kelok Sembilan

Differentiation of Wharton's jelly mesenchymal stem cells into neurons in alginate scaffold

在线全文

维普期刊数据库

学校读者我要写书评

暂无评论

Neural Regeneration Research 2015年第8期10卷 1312-1316页

作者： Seyed mojtaba Hosseini Attiyeh Vasaghi Newsha Nakhlparvar Reza Roshanravan Tahereh Talaei-khozani Zahra razi Student Research Committee Shiraz University of Medical Sciences Cell and molecular medicine Student Research Group Medical School Shiraz University of Medical Sciences Stem Cell Laboratory Department of Anatomy Shiraz University of Medical Sciences Colorectal Research Center Department of Surgery Shiraz University of Medical Science Tissue Engineering Laboratory Department of Tissue Engineering School of Advanced Medical Science and Technology Shiraz University of Medical Sciences Laboratory for Stem Cell Research Department of Anatomy Medical School Shiraz University of Medical Sciences Department of medical Physics Shiraz University of Medical Sciences

Alginate scaffold has been considered as an appropriate biomaterial for promoting the differentiation of embryonic stem cells toward neuronal cell lineage. We hypothesized that alginate scaffold is suitable for culturing Wharton’s jelly mesenchymal stem cells（WJmSCs） and can promote the differentiation of WJmSCs into neuron-like cells. In this study, we cultured WJmSCs in a three-dimensional scaffold fabricated by 0.25% alginate and 50 m m Ca Cl2 in the presence of neurogenic medium containing 10 μm retinoic acid and 20 ng/m L basic fibroblast growth factor. These cells were also cultured in conventional two-dimensional culture condition in the presence of neurogenic medium as controls. After 10 days, immunofluorescence staining was performed for detecting β-tubulin（marker for WJmSCs-differentiated neuron） and CD271（motor neuron marker）. β-Tubulin and CD271 expression levels were significantly greater in the WJmSCs cultured in the three-dimensional alginate scaffold than in the conventional two-dimensional culture condition. These findings suggest that three-dimensional alginate scaffold cell culture system can induce neuronal differentiation of WJmSCs effectively.

关键词： nerve regeneration Wharton’s jelly mesenchymal stem cells mesenchymal stem cells neurons motor neurons alginate 3D scaffold neural regeneration

Valuable Biomolecules from Nine North Atlantic Red macroalgae: Amino Acids, Fatty Acids, Carotenoids, minerals and metals

维普期刊数据库

同方期刊数据库评论

在线全文

学校读者我要写书评

暂无评论

Natural Resources 2016年第4期7卷 157-183页

作者： Behnaz razi Parjikolaei Annette Bruhn Karin Loft Eybye martin mørk Larsen michael Bo Rasmussen Knud Villy Christensen Xavier C. Fretté Department of Chemical Engineering Biotechnology and Environmental Technology University of Southern Denmark Odense Denmark Department of Bioscience Aarhus University Silkeborg Denmark Food Technology Department Life Science Division Danish Technological Institute Aarhus Denmark Department of Bioscience Aarhus University Roskilde Denmark

In modern society, novel marine resources are scrutinized pursuing compounds of use in the medical, pharmaceutical, biotech, food or feed industry. Few of the numerous marine macroalgae are currently exploited. In this study, the contents of nutritional compounds from nine common North Atlantic red macroalgae were compared: the lipid content was low and constant among the species, whereas the fatty acid profiles indicated that these species constitute interesting sources of polyunsaturated fatty acids (PUFA). The dominating essential and non-essential amino acids were lysine and leucine, aspartic acid, glutamic acid, and arginine, respectively. The amino acid score of the nine algae varied from 44% to 92%, the most commonly first limiting amino acid being histidine. Lutein, β-carotene, and zeaxanthin were the identified carotenoids. Contents of all macro and trace minerals, with the exception of phosphorus, were higher than those described for conventional food. Low sodium/potassium ratios (0.08 - 2.54) suggested a potential for using the ash fraction for sodium salt replacement. The algae constituted rich sources of carbohydrates (40% to 71% of Dm) which show their potential for a broader commercial exploitation. In some species, the concentrations of arsenic, cadmium, and lead exceeded limit values for application in food or feed. In conclusion, the nine algae represent promising potential sources of health promoting additives for human and animal diets, in whole or in a biorefinery concept.

关键词： Protein Lipid Carotenoids Dry matter Arsenic

Free vibration and buckling analysis of polymeric composite beams reinforced by functionally graded bamboo fbers

在线全文

维普期刊数据库

学校读者我要写书评

暂无评论

Applied mathematics and mechanics(English Edition) 2024年第3期45卷 543-562页

作者： H.m.FEIZABAD m.H.YAS Department of mechanical Engineering Razi UniversityKermanshah ***Iran

Natural fibers have been extensively researched as reinforcement materials in polymers on account of their environmental and economic advantages in comparison with synthetic fibers in the recent *** fibers are renowned for their good mechanical properties,abundance,and short cycle *** beams are one of the fundamental structural components and are susceptible to mechanical loads in engineering applications,this paper performs a study on the free vibration and buckling responses of bamboo fiber reinforced composite(BFRC)beams on the elastic *** different functionally graded(FG)layouts and a uniform one are the considered distributions for unidirectional long bamboo fibers across the *** elastic properties of the composite are determined with the law of *** Hamilton’s principle,the governing equations of motion are *** generalized differential quadrature method(GDQm)is then applied to the equations to obtain the *** achieved outcomes exhibit that the natural frequency and buckling load values vary as the fiber volume fractions and distributions,elastic foundation stiffness values,and boundary conditions(BCs)and slenderness ratio of the beam ***,a comparative study is conducted between the derived analysis outcomes for BFRC and homogenous polymer beams to examine the effectiveness of bamboo fibers as reinforcement materials,demonstrating the significant enhancements in both vibration and buckling responses,with the exception of natural frequencies for cantilever beams on the Pasternak foundation with the FG-◇fiber ***,the obtained analysis results of BFRC beams are also compared with those for carbon nanotube reinforced composite(CNTRC)beams found in the literature,indicating that the buckling loads and natural frequencies of BFRC beams are lower than those of CNTRC beams.

关键词： bamboo fiber free vibration buckling analysis functionally graded(FG)beam elastic foundation generalized differential quadrature method(GDQm)

Stair and Step Soliton Solutions of the Integrable (2+1) and (3+1)-Dimensional Boiti-Leon-manna-Pempinelli Equations

维普期刊数据库

同方期刊数据库评论

在线全文

学校读者我要写书评

暂无评论

Communications in Theoretical Physics 2012年第12期58卷 785-794页

作者： m.T. Darvishi m. Najafi L. Kavitha m. Venkatesh Department of mathematics Razi University Department of Physiology Faculty of Medicine Kermanshah University of Medical Sciences Department of Physics Periyar University Center for Nanoscience and Nanotechnology Periyar University

The multiple exp-function method is a new approach to obtain multiple wave solutions of nonlinear partial differential equations (NLPDEs). By this method one can obtain multi-soliton solutions of NLPDEs. In this paper, using computer algebra systems, we apply the multiple exp-function method to construct the exact multiple wave solutions of a (2+1)-dimensional Boiti-Leon-manna-Pempinelli equation. Also, we extend the equation to a (3+1)-dimensional case and obtain some exact solutions for the new equation by applying the multiple exp-function method. By these applications, we obtain single-wave, double-wave and multi-wave solutions for these equations.

关键词： multiple exp-function method Boiti-Leon-manna-Pempinelli equation exact solution multi-soliton solution