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Computers, Materials & Continua 2021年第3期66卷 2373-2383页

作者： Antonio peña-garcía Huchang Liao Department of Civil engineering&Research Group“Lighting Technology for Safety and Sustainability” University of GranadaGranada18071Spain Business School Sichuan UniversityChengdu610064China

The requirements for automotive lighting systems,especially the light patterns ensuring driver perception,are based on criteria related to the headlamps,rather than the light perceived by drivers and road ***,important factors such as pavement reflectance,driver age,or time of night,are largely *** factors such as presence of other vehicles,vehicle speed and weather conditions are considered by the Adaptive Driving Beam(ADB)and Adaptive Front-lighting System(AFS)respectively,though with no information regarding the visual perception of drivers and other road ***,it is simpler to simulate and measure the light emitted by the lamps than the light reflected by the pavement or emitted by other *** the current technology in cameras and light sensors,communication protocols,and control of Light emitting Diodes(LeD),combined with decision-making techniques applied to large amounts of data,can open a new era in the operation of headlamps and thus ensure the visual needs of drivers in real time and under actual road *** solution lies in an interaction road-sensor-headlamp,which is not based on the light emitted by headlamps,but rather on the light perceived by the *** study thus proposes a dual grid based on luminance and luminous intensity,which would manage the headlamps by optimizing driver perception and the safety of all road users.

关键词： Vehicle systems optical sensing LeD control automotive lighting

New injectable two-step forming hydrogel for delivery of bioactive substances in tissue regeneration

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Regenerative Biomaterials 2019年第3期6卷 149-162页

作者： edgar pe´rez-Herrero Patricia garcı´a-garcı´a Jaime Go´mez-Morales Matias Llabre´s Araceli Delgado Carmen e´vora Department of Chemical engineering and Pharmaceutical Technology University of La LagunaLa Laguna 38200TenerifeSpain Institute of Biomedical Technologies(ITB) Center for Biomedical Research of the Canary Islands(CIBICAN)University of La LagunaLa Laguna 38071TenerifeSpain Laboratory of Crystallographic Studies Andalusian Earth Sciences InstituteSpanish Research Council—University of GranadaArmillaGranada 18100Spain Institute of Tropical Diseases and Healthcare of the Canary Islands University of La LagunaLa Laguna 38203TenerifeSpain

A hydrogel based on chitosan,collagen,hydroxypropyl-c-cyclodextrin and polyethylene glycol was developed and *** incorporation of nano-hydroxyapatite and pre-encapsulated hydrophobic/hydrophilic model drugs diminished the porosity of hydrogel from 81.6262.25%to 69.9863.07%.Interactions between components of hydrogel,demonstrated by FTIR spectroscopy and rheology,generated a network that was able to trap bioactive components and delay the burst *** thixotropic behavior of hydrogel provided adaptability to facilitate its implantation in a minimally invasive *** profiles from microspheres included or not in hydrogel revealed a two-phase behavior with a burst-and a controlled-release *** same release rate for microspheres included or not in the hydrogel in the controlled-release period demonstrated that mass transfer process was controlled by internal *** diffusion coefficients,Deff,that describe internal diffusion inside microspheres,and mass transfer coefficients,h,*** contribution of hydrogel to mass transfer,were determined using‘genetic algorithms’,obtaining values between 2.64·10^(-15) and 6.67·10^(-15)m^(2)/s for Deff and 8.50·10^(-10) to 3.04·10^(-9) m/s for *** proposed model fits experimental data,obtaining an R2-value ranged between 95.41 and 98.87%.In vitro culture of mesenchymal stem cells in hydrogel showed no manifestations of intolerance or toxicity,observing an intense proliferation of the cells after 7 days,being most of the scaffold surface occupied by living cells.

关键词： hydrogel collagen–cyclodextrin–chitosan rheology mass transfer estradiol FITC-dextran

Recent Growth of Wettability Gradient Surfaces: A Review

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Research 2022年第4期2022卷 359-379页

作者： raza Gulfam Yongping Chen jiangsu Key Laboratory of Micro and Nano Heat Fluid Flow Technology and energy Application School of Environmental Science and EngineeringSuzhou University of Science and TechnologySuzhou 215009China Key Laboratory of energy Thermal Conversion and Control of Ministry of education School of Energy and EnvironmentSoutheast UniversityNanjingJiangsu 210096China

This review reports the recent progress and future prospects of wettability gradient surfaces (WGSs), particularly focusing on the governing principles, fabrication methods, classification, characterization, and applications. While transforming the inherent wettability into artificial wettability via bioinspiration, topographic micro/nanostructures are produced with changed surface energy, resulting in new droplet wetting regimes and droplet dynamic regimes. WGSs have been mainly classified in dry and wet surfaces, depending on the apparent surface states. Wettability gradient has long been documented as a surface phenomenon inducing the droplet mobility in the direction of decreasing wettability. However, it is herein critically emphasized that the wettability gradient does not always result in droplet mobility. Indeed, the sticky and slippery dynamic regimes exist in WGSs, prohibiting or allowing the droplet mobility, respectively. Lastly, the stringent bottlenecks encountered by WGSs are highlighted along with solution-oriented recommendations, and furthermore, phase change materials are strongly anticipated as a new class in WGSs. In all, WGSs intend to open up new technological insights for applications, encompassing water harvesting, droplet and bubble manipulation, controllable microfluidic systems, and condensation heat transfer, among others.

关键词： furthermore bubble harvesting

Low Impedance Fault Identification and Classification Based on Boltzmann Machine Learning for HVDC Transmission Systems

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Journal of Modern Power Systems and Clean energy 2022年第2期10卷 440-449页

作者： Raheel Muzzammel Ali raza the Department of electrical engineering University of LahoreLahore 54000Pakistan

Identification and classification of DC faults are considered as fundamentals of DC grid protection.A sudden rise of DC fault current must be identified and classified to immediately operate the corresponding interrupting *** this paper,the Boltzmann machine learning(BML)approach is proposed for identification and classification of DC faults using travelling waves generated at fault point in voltage source converter based high-voltage direct current(VSC-HVDC)transmission *** unsupervised way of feature extraction is performed on the frequency spectrum of the travelling *** class logistic regression(BCLR)classifies the HVDC transmission system into faulty and healthy *** proposed technique reduces the time for fault identification and classification because of reduced tagged data with few ***,the faults near or at converter stations are readily identified and *** performance of the proposed technique is assessed via simulations developed in MATLAB/Simulink and tested for pre-fault and post-fault data both at VSC1 and VSC2,***,the proposed technique is supported by analyzing the root mean square error to show practicality and realization with reduced computations.

关键词： Binary class logistic regression(BCLR) Boltzmann machine learning(BML) DC grid protection fault identification and classification voltage source converter based high-voltage direct current(VSC-HVDC)transmission system

Mathematical Modelling of Rotavirus Disease Through efficient Methods

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Computers, Materials & Continua 2022年第9期72卷 4727-4740页

作者： Ali raza Department of Mathematics Govt.Maulana Zafar Ali Khan Graduate College WazirabadPunjab Higher Education Department(PHED)Lahore54000Pakistan

The design of evolutionary approaches has a vital role in the recent development of scientific *** tackle highly nonlinear complex problems,nonlinear ordinary differential equations,partial differential equations,stochastic differential equations,and many more may called computational *** rotavirus causes may include severe diarrhea,vomiting,and fever leading to rapid *** the report of the World Health Organization(WHO),approximately 600,000 children die worldwide each year,80 percent of whom live in developing *** million children are hospitalized each *** Asia,up to 45 percent of the children hospitalized for diarrhea may be infected with *** rotavirus model is categorized into five-compartment like susceptible(S),breastfeeding(M),vaccinated(V),infected(I),and recovered children(R).Positivity,boundedness,equilibria,reproduction number,and stability results are part of the qualitative analysis of the *** that,the design of the evolutionary approaches on the model predicts the efficiency,visualization,long-term behavior of the disease,and best results of the rotavirus *** the end,evolutionary computations are an appropriate tool for double-checking the qualitative examination of the model.

关键词： Rotavirus disease epidemic model methods comparison analysis

Thermal radiation and slip effects on magnetohydrodynamic(MHD)stagnation point flow of Casson fluid over a convective stretching sheet

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Propulsion and Power Research 2019年第2期8卷 138-146页

作者： Jawad raza School of Quantitative Sciences Universiti Utara MalaysiaMalaysia University of Lahore Pakpattan CampusPakistan

Current study examines the combined effect of thermal radiation and velocity slip along a convective heated stretching ***(MHD)effect near the stagnation point is also under *** main structure of partial differential equations attained in the form of momentum,energy and concentration *** a self-similar solution,the system of governing PDes assimilated into the set of nonlinear ordinary differential equations by applying suitable similarity *** nonlinear ODes are successfully solved via Runge-Kutta-Fehlberg *** obtained unknown functions are discussed in detail after plotting the numerical results against different arising physical *** validations of numerical results have been taken into account with two different numerical approaches and it is found to be in excellent agreement with the numerical *** study reveals that concentration boundary layer thickness decreases by increasing the values of Schmidt number and increases by increasing the chemical reaction parameter.

关键词： Magnetic field Casson fluid Stretching sheet Thermal radiation Chemical reaction

Comparative analysis of single-crater parameters in ultrasonic-assisted and unassisted micro-eDM of Ti6Al4V using discharge plasma imaging

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Nanotechnology and Precision engineering 2024年第2期7卷 11-24页

作者： Sohaib raza Chandrakant Nirala Department of Mechanical engineering Indian Institute of Technology RoparPunjab 140001India

Ultrasonic-assisted micro-electro-discharge machining(eDM)has the potential to enhance processing responses such as material removal rate(MRR)and surface *** understand the reasons for this enhancement,the physical mechanisms responsible for the individual discharges and the craters that they form need to be *** work examines features of craters formed by single discharges at various parameter values in both conventional and ultrasonic-assistedeDM of ***-speed imaging of the plasma channel is performed,and data on the individual discharges are captured in real-time.A 2D axisymmetric model using finite element software is established to model crater *** the basis of simulation and experimental results,a comparative study is then carried out to examine the effects of ultrasonic vibrational assistance on crater *** every set ofeDM parameters,the crater diameter and depth from a single discharge are found to be higher in ultrasonic-assistedeDM than in conventional*** improved crater geometry and the reduced bulge formation at the crater edges are attributed to the increased melt pool velocity and temperature predicted by the model.

关键词： Ultrasonic vibration Discharge crater Plasma diameter Single discharge

Dipole and Combo Optical Solitons in Birefringent Fibers in the Presence of Four-Wave Mixing

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Communications in Theoretical Physics 2019年第6期71卷 723-730页

作者： Nauman raza Asad Zubair Department of Mathematics University of the Punjab Quaid-e-Azam Campus

The ultimate theme of this study is to develop dipole and combo optical solitons in birefringent fibers(BF) along with the effect of four-wave mixing(4 WM). Two types of rough mediums are used which are Kerr law and parabolic law. Ansatz method of Choudhuri is applied to obtain dark in the bright(dipole) soliton solutions providing bright background for the propagation of optical dark pulse. Ansatz method of Li is applied to obtain combo soliton solutions providing bright solitary wave and dark solitary wave solutions. These results also exist to hold in non-Kerr media with higher order dispersion.

关键词： dipole solitons combo solitons ansatz methods four-wave mixing birefringent fibers

A new study and modeling of COVID-19 disease through fractional models:A comparative paradigm

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Applied Mathematics(A Journal of Chinese Universities) 2024年第4期39卷 674-699页

作者： Muhammad Asad Ullah Nauman raza Department of Mathematics University of the PunjabLahore 54000Pakistan

In this research,novel epidemic models based on fractional calculus are developed by utilizing the Caputo and Atangana-Baleanu(AB)*** models integrate vaccination effects,additional safety measures,home and hospital isolation,and treatment *** models are particularly significant as they provide a more comprehensive understanding of epidemic diseases and can account for non-locality and memory *** points of the model are calculated,including the disease-free and endemic equilibrium points,and the basic reproduction number R0 is computed using the next-generation matrix *** indicate that the epidemic becomes endemic when R0 is greater than unity,and it goes extinct when it is less than *** positiveness and boundedness of the solutions of model are *** Routh-Hurwitz technique is utilized to analyze the local stability of equilibrium *** Lyapunov function and the LaSalle’s principle are used to demonstrate the global stability of equilibrium *** schemes are proposed,and their validity is established by comparing them to the fourth-order Runge-Kutta(RK4)*** simulations are performed using the Adams-Bashforth-Moulton predictor-corrector algorithm for the Caputo time-fractional derivative and the Toufik-Atangana numerical technique for the AB time-fractional *** study looks at how the quarantine policy affected different human population *** the basis of these findings,a strict quarantine policy voluntarily implemented by an informed human population can help reduce the pandemic’s ***,vaccination efforts become a crucial tool in the fight against *** can greatly lower the number of susceptible people and develop a shield of immunity in the population by guaranteeing common access to vaccinations and boosting vaccination ***,the graphical representations of the fractional models are also developed.

关键词： Atangana-Baleanu fractional derivative Caputo fractional derivative Tou k-Atangana numeri-cal scheme Adams-Bashforth-Moulton predictor-corrector Reproduction number R_(0)

Flow and passive scalar transfer characteristics around a row of interacting tandem cylinders

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Journal of Hydrodynamics 2022年第4期34卷 596-619页

作者： Kamau Kingora Mishal Mohammad raza Hamid Sadat Department of Mechanical engineering University of North TexasDentonTexasUSA

Transfer and transport of a passive scalar as well as flow structures of unbounded flow over a row of 2,3,4 and 5 equispaced identical cylinders at Re=90 and pitch ratios 1.05D≤S≤7D are *** are performed through high fidelity simulations using a novel sharp-interface immersed boundary *** flow regimes are identified based on the nature of flow in the gap between the first two cylinders:dormant in the gap where fluid in the gap is motionless;symmetric in the gap where fluid in the gap behaves like a cavity flow;alternating in the gap where fluid in the gap is trapped but flaps up and down;wake in the gap where periodic vortices are shed in the gap;and bi-stable flow regime where vortices are shed in the gap for some time and then quasi-periodic twin vortices prevail for other times.A jump in values of hydrodynamic forces,pressure coefficient,Strouhal number,and Sherwood number is observed as pitch ratio increases due to change in flow *** high pitch ratio,a convectively unstable two-row vortical train is formed by the second *** cylinders immersed in the two-row vortical structures have no effect on flow structure downstream or upstream and portray poor scalar transfer *** effect of configuration size on flow structures is found not to be as prominent as that of pitch ratio.

关键词： Computational fluid dynamics(CFD) interacting cylinders wake interference vortical structures scalar transport