检索结果-南通市图书馆

Machine learning enabled identification and real-time prediction of living plants’ stress using terahertz waves

在线全文

学校读者我要写书评

暂无评论

Defence technology（防务技术） 2022年第8期18卷 1330-1339页

作者： Adnan Zahid Kia Dashtipour Hasan t.abbas Ismail Ben Mabrouk Muath Al-Hasan Aifeng Ren Muhammad A.Imran Akram Alomainy Qammer H.abbasi School of Engineering and Physical Science Heriot-Watt UniversityEdinburghEH144ASUK James Watt School of Engineering University of GlasgowGlasgowG128QQUK College of Engineering Al-Ain UniversityAbu DhabiUnited Arab Emirates School of Electronic Engineering Xidian UniversityXi'anShaanxiChina School of Electronic Engineering and Computer Science Queen Mary University of LondonLondonUK

Considering the ongoing climate transformations, the appropriate and reliable phenotyping information of plant leaves is quite significant for early detection of disease, yield improvement. In real-life digital agricultural environment, the real-time prediction and identification of living plants leaves has immensely grown in recent years. Hence, cost-effective and automated and timely detection of plans species is vital for sustainable agriculture. this paper presents a novel, non-invasive method aiming to establish a feasible, and viable technique for the precise identification and observation of altering behaviour of plants species at cellular level for four consecutive days by integrating machine learning (ML) and tHz with a swissto12 materials characterization kit (MCK) in the frequency range of 0.75 to 1.1 tHz. For this purpose, measurements observations data of seven various living plants leaves were determined and incorporate three different ML algorithms such as random forest (RF), support vector machine, (SVM), and K-nearest neighbour (KNN). the results demonstrated that RF exhibited higher accuracy of 98.87% followed by KNN and SVM with an accuracy of 94.64% and 89.67%, respectively, for precise detection of different leaves by observing their morphological features. In addition, RF outperformed other classifiers for determination of water-stressed leaves and having an accuracy of 99.42%. It is envisioned that proposed study can be proven beneficial and vital in digital agriculture technology for the timely detection of plants species to significantly help in mitigate yield and economic losses and improve crops quality.

关键词： terahertz sensing Plants health Machine learning

Significance of induced magnetic field and variable thermal conductivity on stagnation point flow of second grade fluid

在线全文

学校读者我要写书评

暂无评论

Journal of Central South University 2021年第11期28卷 3381-3390页

作者： A.A.KHAN S.ILYAS t.abbas R.ELLAHI Department of Mathematics and Statistics International Islamic UniversityIslamabad 44000Pakistan Departrment of Mathematics Division of Science and TechnologyUniversity of EducationLahore 54770Pakistan Fulbright Fellow Department of Mechanical Engineering University of California RiversideRiverside 92521USA

In this study,the stagnation point transport of second grade fluid with linear stretching under the effects of variable thermal conductivity is *** magnetic field impact is also *** nonlinear set of particle differential equations is converted into set of ordinary differential equations through appropriate *** resulting equations are then resolved by optimal homotopy analysis *** effect of pertinent parameters of interest on skin friction coefficient,temperature,induced magnetic field,velocity and local Nusselt number is inspected by generating appropriate *** numerical results,the built-in bvp4 c technique in computational software MAtLAB is used for the convergence and residual errors of obtained series *** is perceived that the induced magnetic field is intensified by increasing β.It can also be observed that skin friction coefficient enhances with increasing value of magnetic parameter depending on the stretching ratio a/*** the validness of the obtained results,a comparison has been made and an excellent agreement of current study with existing literature is found.

关键词： stagnation point variable thermal conductivity induced magnetic field second grade fluid

Biochar Application Improves the Drought tolerance in Maize Seedlings

在线全文

学校读者我要写书评

暂无评论

Phyton-International Journal of Experimental Botany 2019年第4期88卷 379-388页

作者： A.Sattar A.Sher M.Ijaz M.Irfan M.Butt t.abbas S.Hussain A.abbas M.S.Ullah M.A.Cheema College of Agriculture Bahauddin Zakariya University Bahadur Sub-CampusLayyah31200Pakistan Department of Agronomy Faculty of Agriculture Science and Technology Bahauddin Zakariya UniversityMultan60800Pakistan Faculty of Pharmaceutical Sciences Government College UniversityFaisalabad38000Pakistan School of Science and the Environment Grenfell Campus Memorial University of NewfoundlandCorner Brook2000A2H 5G4Canada

Application of biochar to agricultural soils is mostly used to improve soil *** treatments were comprised of two factors:i)drought at two level,i.e.,80%and 40%water holding capacity(WHC)which was maintained on gravimetric basis ii)three levels of biochar i.e.,control,2 t ha^(-1) and 4 t ha^(-1) added to *** was done to examine potential of biochar application to enhance the growth attributes,water relations,photosynthetic pigments and antioxidants activities in maize(Zea mays L.)*** of study revealed that biochar application increased the growth qualities(total seedlings biomass,dry weight of shoot and root,shoot length and root length).In addition;contents of photosynthetic pigments(chlorophyll a,b,a+b and a/b),water relation(relative water contents,turgor potential,osmotic potential and water potential)were improved significantly due to addition of *** of 4 t ha^(-1) biochar led to significant rise activity of enzymatic antioxidant catalase(CAt),superoxide dismutase(SOD)and peroxidase(POD)in leaf of maize seedling sunder drought as well as well watered ***,biochar applied at the rate 4 t ha^(-1) improved the all the physiological and biochemical attributes in maize seedlings under *** the results it was concluded that biochar application is an efficient way to alleviate adverse effect of drought stress on *** drought prone areas,long term impacts of biochar on production of maize and properties of soil could be recommended as upcoming shove.

关键词： Antioxidants biochar drought stress water relations chlorophyll contents

transport mechanism in chemically reactive hybrid nanofluid flow containing gyrotactic micro-organisms over a curved oscillatory surface

维普期刊数据库评论

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) 2025年第1期46卷 177-192页

作者： M.NAVEED M.IMRAN t.ASGHAR Z.abbas Department of Mathematics Division of Science and TechnologyUniversity of Education Department of Mathematics The Islamia University of Bahawalpur

this paper examines the transport analysis, including both heat transfer and mass transfer, in hybrid nanofluid flow containing gyrotactic microorganisms towards a curved oscillatory surface. the influence of magnetic fields is also inspected in terms of their physical characteristics. to depict the phenomena of transport, modified versions of both Fick's and Fourier's laws are used. Additionally, the characteristics of both heterogeneous and homogeneous chemical reactions are also incorporated. Utilizing a curvilinear coordinate system, the flow problem is formulated as partial differential equations(PDEs)for momentum, concentration, microorganism field, and energy. An analytical solution to the obtained flow equations is achieved utilizing the homotopy analysis method(HAM).the effects of significant flow parameters on the pressure and microorganism fields, velocity, oscillation velocity, concentration, and temperature distributions are shown via graphs. Furthermore, the variations in skin friction, mass transfer rate, heat transfer rate, and local motile number due to different involved parameters are presented in tables and are analyzed in detail. Graphical results indicate that the curves of velocity and temperature fields are enhanced as the values of the solid volume fraction variables *** is also verified that the concentration rate field decreases as the values of the homogeneous reaction strength parameter and the radius of curvature parameter increase, and it increases with the Schmidt number and the heterogeneous reaction strength *** outcomes show a favorable response of the motile number to advanced values of the Peclet number, the Schmidt number, the microorganism difference parameter, and the bio-convective Lewis number.

关键词：

Simple operated multipurpose temperature control cryostat

在线全文

同方期刊数据库

学校读者我要写书评

暂无评论

Journal of Zhejiang University-Science A(Applied Physics & Engineering) 2007年第5期8卷 793-796页

作者： abbas t.A. OMAR M.S. Department of Physics College of Science University of SalahaddinArbilIraqi KurdistanIraq

A suitable simple optical cryostat for optical, magneto-optical, electrical and thermo-electrical measurements was designed. It is suitable for use in a magnetic pool gap as narrow as less than 1 cm. throughout a long period of time, the heat diffusion process of the cryostat can be easily operated at slow increase in sample temperature in a range 1.25 K/min at 200 K that will be reduced gradually to 0.66 K at room temperature. Liquid nitrogen was used to cool down the temperature. During the operation, the change in the measured energy gap of a semiconductor sample and other physical parameters resulting from the change of temperature can be corrected through the temperature coefficient of that parameter at the corresponding temperature. the cryostat was successfully used for all experiments mentioned above to measure the properties of a single crystal of GaP (Gallium Phosphate) semiconductor.

关键词： Optical cryostat Electrical cryostat Magneto-optical cryostat

Analysis of thermal responses in a two-dimensional porous medium caused by pulse heat flux

在线全文

学校读者我要写书评

暂无评论

Applied Mathematics and Mechanics(English Edition) 2020年第6期41卷 927-938页

作者： t.SAEED I.A.abbas Nonlinear Analysis and Applied Mathematics(NAAM)Research Group Department of MathematicsKing Abdulaziz UniversityJeddah 21441Saudi Arabia Department of Mathematics Faculty of ScienceSohag UniversitySohag 82524Egypt

In this article, the generalized model for thermoelastic waves with two relaxation times is utilized to compute the increment of temperature, the displacement components, the stress components, and the changes in the volume fraction field in a two-dimensional porous medium. By using the Fourier-Laplace transform and the eigenvalue method, the considered variables are obtained analytically. the derived approach is estimated with numerical outcomes which are applied to the porous media with a geometrical simplification. the numerical results for the considered variables are performed and presented graphically. Finally, the outcomes are represented graphically to display the difference among the classical dynamical(CD) coupled, the Lord-Shulman(LS), and the Green-Lindsay(GL) models.

关键词： Fourier-Laplace transform thermal relaxation time porous medium eigenvalue approach

Applying the spectral stochastic finite element method in multiple-random field RC structures

在线全文

学校读者我要写书评

暂无评论

Frontiers of Structural and Civil Engineering 2022年第4期16卷 434-447页

作者： abbas YAZDANI Civil Engineering Department University of Sistan and BaluchestanZahedan 98167-45845Iran

this paper uses the spectral stochastic finite element method(SSFEM)for analyzing reinforced concrete(RC)beam/slab *** doing so,it presents a new framework to study how the correlation length of a random field(RF)with uncertain parameters will affect modeling uncertainties and reliability *** considers:1)different correlation lengths for uncertainty parameters,and 2)dead and live loads as well as the elasticity moduli of concrete and steel as a multi-dimensional RF in concrete *** show the SSFEM’s efficiency in the study of concrete structures and to evaluate the sensitivity of the correlation length effects in evaluating the reliability,two examples of RC beams and slabs have been *** to the results,the RF correlation length is effective in modeling uncertainties and evaluating reliabilities;the longer the correlation length,the greater the dispersion range of the structure response and the higher the failure probability.

关键词： uncertainty spectral stochastic finite element method correlation length reliability assessment reinforced concrete beam/slab

Characteristics of settling of dilute suspension of particles with different density at high Reynolds numbers

在线全文

学校读者我要写书评

暂无评论

Particuology 2021年第3期19卷 62-74页

作者： Ali abbas Zaidi Department of Mechanical and Process Engineering ETH Zurich8092 ZurichSwitzerland

Dilute suspension of particles with same density and size develops clusters when settle at high Reynolds number(≥250).It is due to particles entrapment in the wakes produced by upstream *** this work,this phenomenon is studied for suspension having particles with different densities by numerical *** particle-fluid interactions are modelled using immersed boundary method and inter-particle collisions are modelled using discrete element *** simulations,settling Reynolds number is always kept above 250 and the suspension solid volume fraction is nearly 0.1 *** particle density ratios(*** of heavy particles to lighter particles)equal to 4:1 and 2:1 and particles with same density are *** each density ratio,the percentage volume fraction of each particle density is nearly varied from 0.8 to *** characteristics such as microstructures of settling particle,average settling velocity and velocity fluctuations of settling particles are *** show that for different density particles settling characteristics of suspension is largely dominated by heavy *** the end of paper,the underlying physics is explained for the anomalies observed in simulation.

关键词： Particle clustering at high reynolds number Suspension with different density particles Particle microstructure due to settling Immersed boundary method

Unsteady three-dimensional MHD flow of the micropolar fluid over an oscillatory disk with Cattaneo-Christov double diffusion

维普期刊数据库评论

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) 2019年第10期40卷 1471-1486页

作者： A.RAUF S.A.SHEHZAD Z.abbas t.HAYAt Department of Mathematics COMSATS University Islamabad Sahiwal 57000 Pakistan Department of Mathematics The Islamia University of Bahawalpur Bahawalpur 63100 Pakistan Department of Mathematics Quiad-i-Azam University Islamabad 44000 Pakistan

Cattaneo-Christov heat and mass flux models are considered rather than Fourier and Fick laws due to the presence of thermal and concentration transport hyperbolic phenomena. the generalized form of the Navier-Stokes model is considered in hydromagnetic flow. three-dimensional (3D) unsteady fluid motion is generated by the periodic oscillations of a rotating disk. Similarity transformations are used to obtain the normalized fluid flow model. the successive over relaxation (SOR) method with finite difference schemes are accomplished for the numerical solution of the obtained partial differential non-linear system. the flow features of the velocity, microrotation, temperature, and concentration fields are discussed in pictorial forms for various physical flow parameters. the couple stresses and heat and mass transfer rates for different physical quantities are explained via tabular forms. For better insight of the physical fluid model, 3D fluid phenomena and two-dimensional (2D) contours are also plotted. the results show that the micropolar fluids contain microstructure having non-symmetric stress tensor and are useful in lubrication theory. Moreover, the thermal and concentration waves in Cattaneo-Christov models have a significance role in the laser heating and enhancement in thermal conductivity.

关键词： three-dimensional (3D) flow micropolar fluid magnetohydrodynamics (MHD) Cattaneo-Christov theory oscillatory disk