检索结果-南通市图书馆

Integrated self-referencing single shot digital holographic microscope and optical tweezer

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

Light(Advanced Manufacturing) 2022年第3期3卷 205-218页

作者： Subhash Utadiya Sachin Joshi Nimit Patel Chetna Patel Mugdha Joglekar Vani Cahhniwal Timothy O’Connor bahram javidi Arun Anand Optics Laboratory Applied Physics DepartmentFaculty of Technology and EngineeringThe Maharaja Sayajirao University of BarodaVadodara 390001India Department of Electrical and Computer Engineering University of ConnecticutStorrsCT06269-4157USA Institute of Interdisciplinary Studies The Maharaja Sayajirao University of BarodaVadodaraIndia

Digital holographic microscopy is a single-shot technique for quantitative phase imaging of samples,yielding thickness profiles of phase *** provides sample features based on their morphology,leading to their classification and ***,observing samples,especially cells,in fluids using holographic microscopes is difficult without immobilizing the *** tweezers can be used for sample immobilization in *** present manuscript provides an overview of our ongoing work on the development of a compact,low-cost microscopy system for digital holographic imaging of optically trapped *** of digital holographic microscopy system with tweezers is realized by using the optical pickup unit extracted from DVD burners to trap microsamples,which are then holographically imaged using a highly compact self-referencing interferometer along with a low-cost,in-house developed quadrant photodiode,providing morphological and spectral information of trapped *** developed integrated module was tested using polystyrene microspheres as well as human *** investigated system offers a multitude of sample features,including physical and mechanical parameters and corner frequency information of the *** features were used for sample *** proposed technique has vast potential in opening up new avenues for low-cost,digital holographic imaging and analysis of immobilized samples in fluids and their classification.

关键词： Digital holographic microscopy Optical tweezers Red blood cells Quantitative phase imaging

Quasi noise-free digital holography

在线全文

维普期刊数据库

学校读者我要写书评

暂无评论

Light(Science & Applications) 2016年第1期5卷 506-517页

作者： Vittorio Bianco Pasquale Memmolo Melania Paturzo Andrea Finizio bahram javidi Pietro Ferraro Institute of Applied Sciences and Intelligent Systems''E.Caianiello'' Italian National Research Council(ISASI-CNR)Via Campi Flegrei 3480078Pozzuoli(Napoli)Italy ECE Department University of ConnecticutU-157StorrsConnecticut06269USA

One of the main drawbacks of Digital Holography(DH)is the coherent nature of the light source,which severely corrupts the quality of holographic *** numerous techniques to reduce noise in DH have provided good results,holographic noise suppression remains a challenging *** propose a novel framework that combines the concepts of encoding multiple uncorrelated digital holograms,block grouping and collaborative filtering to achieve quasi noise-free DH *** optimized joint action of these different image-denoising methods permits the removal of up to 98%of the noise while preserving the image *** resulting quality of the hologram reconstructions is comparable to the quality achievable with non-coherent techniques and far beyond the current state of art in *** validation is provided for both singlewavelength and multi-wavelength DH,and a comparison with the most used holographic denoising methods is performed.

关键词： coherent noise reduction digital holography image reconstruction techniques multiplex holography noise in imaging systems speckle

Strategies for reducing speckle noise in digital holography

在线全文

维普期刊数据库

学校读者我要写书评

暂无评论

Light(Science & Applications) 2018年第1期7卷 613-628页

作者： Vittorio Bianco Pasquale Memmolo Marco Leo Silvio Montresor Cosimo Distante Melania Paturzo Pascal Picart bahram javidi Pietro Ferraro CNR-ISASI Istituto di Scienze Applicate e Sistemi Intelligenti“E.Caianiello” via Campi Flegrei 3480078 Pozzuoli(NA)Italy Universitédu Maine CNRS UMR 6613LAUMAvenue Olivier Messiaen72085 Le Mans Cedex 9France Electrical and Computer Engineering Department University of ConnecticutU-4157StorrsCT 06269USA

Digital holography(DH)has emerged as one of the most effective coherent imaging *** technological developments of digital sensors and optical elements have made DH the primary approach in several research fields,from quantitative phase imaging to optical metrology and 3D display technologies,to name a *** many other digital imaging techniques,DH must cope with the issue of speckle artifacts,due to the coherent nature of the required light *** the complexity of the recently proposed de-speckling methods,many have not yet attained the required level of *** is,a universal denoising strategy for completely suppressing holographic noise has not yet been *** the removal of speckle noise from holographic images represents a bottleneck for the entire optics and photonics scientific *** review article provides a broad discussion about the noise issue in DH,with the aim of covering the best-performing noise reduction approaches that have been proposed so *** comparisons among these approaches will be presented.

关键词： speckle holographic coherent

Theoretical and experimental study on the fluidity performance of hard-to-fluidize carbon nanotubes-based CO_(2) capture sorbents

在线全文

维普期刊数据库

学校读者我要写书评

暂无评论

Frontiers of Chemical Science and Engineering 2022年第10期16卷 1460-1475页

作者： Mahsa javidi Nobarzad Maryam Tahmasebpoor Mohammad Heidari Covadonga Pevida Faculty of Chemical&Petroleum Engineering University of TabrizTabriz 51666-16471Iran Instituto de Ciencia y Tecnología del Carbono INCAR-CSICOviedo 33011Spain

Carbon nanotubes-based materials have been identified as promising sorbents for efficient CO_(2)capture in fluidized beds,suffering from insufficient contact with CO_(2)for the high-level CO_(2)capture *** study focuses on promoting the fluidizability of hard-to-fluidize pure and synthesized silica-coated amine-functionalized carbon *** novel synthesized sorbent presents a superior sorption capacity of about 25 times higher than pure carbon nanotubes during 5 consecutive adsorption/regeneration *** low-cost fluidizable-SiO_(2)nanoparticles are used as assistant material to improve the fluidity of carbon nanotubes-based *** reveal that a minimum amount of 7.5 and 5 wt%SiO_(2)nanoparticles are required to achieve an agglomerate particulate fluidization behavior for pure and synthesized carbon nanotubes,*** carbon nanotubes+7.5 wt%SiO_(2)and synthesized carbon nanotubes+5 wt%SiO_(2)indicates an agglomerate particulate fluidization characteristic,including the high-level bed expansion ratio,low minimum fluidization velocity(1.5 and 1.6 cm·s^(–1)),high Richardson−Zaki n index(5.2 and 5.3>5),and lowΠvalue(83.2 and 84.8<100,respectively).Chemical modification of carbon nanotubes causes not only enhanced CO_(2)uptake capacity but also decreases the required amount of silica additive to reach a homogeneous fluidization behavior for synthesized carbon nanotubes sorbent.

关键词： CO_(2) capture CNT-based sorbents fluidization SiO_(2) nanoparticles fluidized bed reactors

Hierarchical data replication strategy to improve performance in cloud computing

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

Frontiers of Computer Science 2021年第2期15卷 63-79页

作者： Najme MANSOURI Mohammad Masoud javidi Behnam Mohammad Hasani ZADE Department of Computer Science Shahid Bahonar University of KermanKerman76169-14111Iran Mahani Mathematical Research Center Shahid Bahonar University of KermanKerman76169-14111Iran

Cloud computing environment is getting more interesting as a new trend of data *** replication has been widely applied to improve data access in distributed systems such as Grid and ***,due to the finite storage capacity of each site,copies that are useful for future jobs can be wastefully deleted and replaced with less valuable ***,it is considerable to have appropriate replication strategy that can dynamically store the replicas while satisfying quality of service(QoS)requirements and storage capacity *** this paper,we present a dynamic replication algorithm,named hierarchical data replication strategy(HDRS).HDRS consists of the replica creation that can adaptively increase replicas based on exponential growth or decay rate,the replica placement according to the access load and labeling technique,and finally the replica replacement based on the value of file in the *** evaluate different dynamic data replication methods using CloudSim *** demonstrate that HDRS can reduce response time and bandwidth usage compared with other *** means that the HDRS can determine a popular file and replicates it to the best *** method avoids useless replications and decreases access latency by balancing the load of sites.

关键词： cloud computing data replication multi-tier architecture simulation load balance

Modeling and optimization of the parameters affecting the in-situ microencapsulation process for producing epoxy-based self-healing anti-corrosion coatings

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

Particuology 2018年第1期16卷 59-69页

作者： Ali Ebrahiminiya Mohammad Khorram Shadi Hassanajili Mehdi javidi School of Chemical and Petroleum Engineering Shiraz University Shiraz lran Department of Materials Science and Engineering School of Engineering Shiraz University Shiraz lran

Micro/nanocapsules of urea-formaldehyde resin loaded with linseed oil, which are a self-healing agent in glass flake epoxy anti-corrosion paint, were prepared using a combination of ultrasonic homogenization and in-situ polymerization. The main objective of this study was to model and optimize the microen- capsulation process. Five-level central composite design was used to design, model, and optimize the microencapsulation process. A quadratic model was constructed to show the dependency of the per- centage of encapsulated linseed oil and capsule size, as model responses, on the studied independent variables （the rotational speed of the agitator and the power and duration of sonication）. Analysis of vari- ance showed that all of the variables have significant effects on the encapsulated linseed oil percentage, while the rotational speed of the agitator and sonication time is effective variables for controlling the capsule size. Under the determined optimum conditions, a maximum encapsulated linseed oil percentage （ELO%） of 93.9% and a minimum micro/nanocapsule size of 0.574 μm were achieved at 594 rpm agitation, 350 W sonication power, and 3 min sonication time. Validation of the model was performed. The percent- age relative errors between the predicted and experimental values of the ELO% and micro/nanocapsule size are 1.28% and 3.66%, respectively. The efficacy of the optimum micro/nanocapsules in healing cracks in a glass flake epoxy paint and corrosion protection was investigated by the salt spray test and Tafel polarization technique.

关键词： Urea-formaldehyde Response surface methodology Central composite design Ultrasonic homogenization Linseed oil Self-healing coating

Analytical and Numerical Solutions of Riesz Space Fractional Advection-Dispersion Equations with Delay

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 2019年第10期121卷 249-272页

作者： Mahdi Saedshoar Heris Mohammad javidi Bashir Ahmad Department of Applied Mathematics University of TabrizTabrizIran Nonlinear Analysis and Applied Mathematics(NAAM)Research Group Department of MathematicsFaculty of ScienceKing Abdulaziz UniversityJeddah 21589Saudi Arabia.

In this paper,we propose numerical methods for the Riesz space fractional advection-dispersion equations with delay(RFADED).We utilize the fractional backward differential formulas method of second order(FBDF2)and weighted shifted Grünwald difference(WSGD)operators to approximate the Riesz fractional derivative and present the finite difference method for the ***,the FBDF2 and the shifted Grünwald methods are ***,based on the FBDF2 method and the WSGD operators,the finite difference method is applied to the *** also show that our numerical schemes are conditionally stable and convergent with the accuracy of O(+h2)and O(2+h2)*** we find the analytical solution for RFDED in terms Mittag-Leffler type ***,some numerical examples are given to show the efficacy of the numerical methods and the results are found to be in complete agreement with the analytical solution.

关键词： Riesz fractional derivative shifted Grünwald difference operators fractional advection-dispersion equation delay differential equations FBDF method

A fractional-order toxin producing phytoplankton and zooplankton system

在线全文

维普期刊数据库

学校读者我要写书评

暂无评论

International Journal of Biomathematics 2014年第4期7卷 63-83页

作者： M. javidi N. Nyamoradi Faculty of Mathematical SciencesUniversity of Tabriz Tabriz Iran Department of MathematicsFaculty of Sciences Razi University 67149 Kermanshah Iran

In this work, we investigate the dynamical behavior of a fractional-order toxin producing on a phytoplankton-zooplankton （TPPZ） system with nutrient cycling. We propose a mathematical system to model this situation. All the feasible equilibria of the system are obtained and the conditions for the existence of the equilibriums are determined. Local stability analysis of the TPPZ is studied by using the fractional Routh-Hurwitz stability conditions. Numerical simulations are carried out for a hypothetical set of parameter values to substantiate our analytical findings.

关键词： Toxic-phytoplankton zooplankton stability numerical simulation frac-tional-order.

Dynamic analysis of a fractional order system

在线全文

维普期刊数据库

学校读者我要写书评

暂无评论

International Journal of Biomathematics 2015年第6期8卷 157-173页

作者： M. javidi N. Nyamoradi Faculty of Mathematical SciencesUniversity of Tabriz Tabriz Iran Department of Mathematics Faculty of Sciences Razi University 67149 Kermanshah Iran

In this paper, we investigate the dynamical behavior of a fractional order phytoplankton- zooplankton system. In this paper, stability analysis of the phytoplankton zooplankton model （PZM） is studied by using the fractional Routh-Hurwitz stability conditions. We have studied the local stability of the equilibrium points of PZM. We applied an efficient numerical method based on converting the fractional derivative to integer derivative to solve the PZM.

关键词： Phytoplankton-zooplankton model Routh-Hurwitz stability conditions numerical simulation.