检索结果-南通市图书馆

Numerical investigation on the heat transfer enhancement using a confined slot impinging jet with nanofluid

在线全文

维普期刊数据库

学校读者我要写书评

暂无评论

Propulsion and Power Research 2019年第4期8卷 351-361页

作者： Ibrahim K.Alabdaly m.A.Ahmed Department of mechanical Engineering College of EngineeringUniversity of AnbarRamadiAnbarIraq

In this article,laminar convective heat transfer of a confined slot impinging jet with nanofluid has been numerically investigated over Reynolds number ranges of *** circular ribs are mounted on the lower-target surface:one rib located right the stagnation point and another one located on the left of the stagnation ***2-water nanofluid with nanoparticles volume fraction ranging from 0 to 4%and nanoparticles diameters of 30 nm has been *** two-dimensional governing continuity,momentum and energy equations have been solved using finite volume method based on SImPLE *** effect of Reynolds number,nanoparticles volume fraction,rib height and rib location on the flow and thermal characteristics are presented and *** showed that the average Nusselt number,performance factor,total entropy generation as well as friction factor increase with increasing nanoparticles volume *** addition,it is found that the best thermal-hydraulic performance factor is around 1.89 which is obtained at Reynolds number of 1000,nanoparticles volume fraction of 4%,the rib height of 0.1 and the rib location of 2.

关键词： Jet impingement Nanofluid Entropy generation Thermal-hydraulic performance Finite volume method

Study of the νi_(13/2)^(-1) band in ^(189)Pt

在线全文

维普期刊数据库

学校读者我要写书评

暂无评论

Chinese Physics C 2009年第9期33卷 743-747页

作者：滑伟周小红张玉虎郭应祥 Oshima m. Toh Y. Koizumi m. Osa A. Hatsukawa Y. 亓斌张双全孟杰 Sugawara m. Institute of modern Physics Chinese Academy of Sciences Graduate University of Chinese Academy of Sciences Japan Atomic Energy Agency School of Physics and State-Key Lab. Nucl. Phys. & Tech. Peking University Chiba Institute of Technology Narashino

High-spin levels of ^189Pt have been studied with the in-beam T-spectroscopy method via the ^176Yb（^18O,5n） reaction at the beam energies of 88 and 95 meV. The previously known ＂vi-1 13/2 band has been confirmed, and its unfavored signature branch extended up to the 31/2^＋ state. Within the framework of the triaxial particle-rotor model, the vi-1 13/2 band is suggested to be associated with the 11/2[615] configuration, and to have triaxial deformation.

关键词： high-spin state configuration particle-rotor model

Endoscopic palliation of malignant biliary stricture

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

World Journal of Gastrointestinal Oncology 2016年第3期8卷 240-247页

作者： Sanjay m Salgado monica Gaidhane michel Kahaleh Division of Gastroenterology and Hepatology Weill Cornell Medical College

malignant biliary strictures often present late after the window for curative resection has elapsed. In such patients, the goal of therapy is typically focused on palliation. While historically, palliative measures were performed surgically, the advent of endoscopic intervention offers minimally invasive options to provide relief of symptoms, improve quality of life, and in some cases, increase survival of these patients. Some of these therapies, such as endoscopic biliary decompression, have become mainstays of treatment for decades, whereas newer modalities, including radiofrequency ablation, and photodynamic therapy offer additional options for patients with incurable biliary malignancies.

关键词： Biliary strictures malignant Endoscopic retrograde cholangiopancreatography Photodynamic therapy Endoscopy Palliation Endoscopic ultrasound Radiofrequency ablation

Predictor-corrector FDm analysis of mHD Darcy-Forchheimer flow of a micropolar fluid with viscous dissipation and heterogeneous-homogeneous

在线全文

维普期刊数据库

学校读者我要写书评

暂无评论

Propulsion and Power Research 2024年第2期13卷 257-272页

作者： D.Thenmozhi m.Eswara Rao Department of mathematics Saveetha School of EngineeringSIMATSChennaiTamilnaduIndia

This research delves into an intricate exploration offluid dynamics within heat transfer systems,with a specific focus on enhancing our understanding and improving system *** a sophisticated mathematical model,the study incorporates micropolarfluid dynamics,micro rotational effects,laminarflow characterized by the Darcy-Forchheimer model,inertia effects,and chemical reactions within a heat transfer system featuring boundary layer *** mathematical framework consists of partial differential equations(PDEs),and the study utilizes advanced numerical techniques,including the(PC4-FDm)Predictor-Corrector Finite Difference method and the shooting method,to solve these govern-ing *** inclusion of quantized mesh points and analysis of convergence using 4th orderfinite difference methods enhances the precision of the obtained *** param-eters are scrutinized to draw meaningful *** heterogeneous parameter reveals an increasing trend influid concentration,while the homogeneous parameter indicates a collision effect leading to a decrease influid *** Eckert number,associated with viscous dissipation,exhibits a correlation with decreasedfluid temperature and increasedfluid *** rotation parameters suggest a parallel increase influid velocity and a marginal decrease influid ***,the Darcy-Forchheimer parameter,reflective of inertial effects,showcases an increase influid temperature and decrease in velocity in the convection *** the industrial implications,the study underscores the significance of convection heat transfer systems in the context of *** offer valuable insights for optimizing heating and cooling processes in diverse industrial applications,ranging from power plants to waste heat recovery units and pharmaceutical industries.

关键词： Predictor-corrector micropolarfluid magnetohydrodynamics(mHD) Viscous dissipation Homogeneous-heterogeneous

Optimization of Quantum Cost for Low Energy Reversible Signed/Unsigned multiplier Using Urdhva-Tiryakbhyam Sutra

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 Systems Science & Engineering 2023年第8期46卷 1827-1844页

作者： marwa A.Elmenyawi Radwa m.Tawfeek Benha Faculty of Engineering Benha University BenhaEgypt Arab Academy for Science Technology and Maritime Transport-Arab LeagueCairoEgypt

One of the elementary operations in computing systems is ***,high-speed and low-power multipliers design is mandatory for efficient computing *** designing low-energy dissipation circuits,reversible logic is more efficient than irreversible logic circuits but at the cost of higher *** paper introduces an efficient signed/unsigned 4×4 reversible Vedic multiplier with minimum quantum *** Vedic multiplier is considered fast as it generates all partial product and their sum in one *** paper proposes two reversible Vedic multipliers with optimized quantum cost and garbage ***,the unsigned Vedic multiplier is designed based on the Urdhava Tiryakbhyam(UT)*** multiplier consists of bitwise multiplication and adder *** with Vedic multipliers in the literature,the proposed design has a quantum cost of 111 with a reduction of 94%compared to the previous *** has a garbage output of 30 with optimization of the best-compared ***,the proposed unsigned multiplier is expanded to allow the multiplication of signed numbers as well as unsigned *** signed Vedic multipliers are presented with the aim of obtaining more optimization in performance *** has separate binary two’s complement(B2C)and mUX circuits,while DesignII combines binary two’s complement and mUX circuits in one *** shows the lowest quantum cost,231,regarding *** has a quantum cost of 199,reducing to 86.14%of *** functionality of the proposed multiplier is simulated and verified using XILINX ISE 14.2.

关键词： Vedic multiplier Urdhava Tiryakbhyam reversible logic signed/unsigned multiplier B2C

Global analysis of a reaction-diffusion blood-stage malaria model with immune response

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 2020年第4期13卷 201-231页

作者： A.m.Elaiw A.D.Al Agha Department of mathematics Faculty of Science King Abdulaziz University P.O.Box 80203Jeddah 21589Saudi Arabia

malaria is one of the most dangerous diseases that threatens people's lives around the *** this paper,we study a reaction-difusion model for the within-host dynamics of malaria infection with an antibody immune *** model is given by a system of partial differential equations(PDEs)to describe the blood-stage of malaria life *** addresses the interactions between uninfected red blood cells,antibodies,and three types of infected red blood cells,namely ringinfected red blood cells,trophozoite-infected red blood cells and schizont-infected red blood ***,the model contains a parameter to measure the efficacy of isoleucinc starvation and its effect on the growth of malaria *** show the basic properties of the *** compute all equilibria and derive the thresholds from the conditions of existence of malaria equilibrium *** prove the global stability of all equilibrium points based on choosing suitable Lyapunov *** use the characteristic equations to verify the local instability of equilibrium *** finally execute numerical simulations to validate the theoretical results and highlight some important *** results indicate that isoleucine starvation can have a critical impact on the stability of equilibrium *** the efficacy of isoleucine starvation is high,it switchcs the system from the infection state to the malaria-free *** presence of an antibody immune response does not lead to the elimination of malaria infection,but it suppresses the growth of malaria parasites and increases the amount of healthy red blood cells.

关键词： Plasmodium falciparum diffusion global stability isoleucine starvation anti-body irnmunity

Finite element analysis on transient magnetohydrodynamic(mHD)free convective chemically reacting micropolar fluid flow past a vertical porous plate with Hall current and viscous dissipation

在线全文

维普期刊数据库

学校读者我要写书评

暂无评论

Propulsion and Power Research 2018年第4期7卷 353-365页

作者： Siva Reddy Sheri m.D.Shamshuddin Department of mathematics.G1TAm University Hyderabad CampusTelangana 502329India Department of mathematics.Vaagdevi College of Engineering WarangalTelangana 506005India

This article deals with boundary layer analysis of magnetohydrodynamics on an unsteady chemically reactive micropolar rotating fluid flow past a semi-infinite vertical plate with been developed under Boussinesq *** governing partial differential equations are transformed into a set of coupled partial differential equations using suitable dimensionless *** resultant equations are solved numerically using variational finite element method.A parametric study illustrating the influence of different pertinent parameters is performed and the numerical results for translational velocity,microrotation velocity,temperature and concentration distributions near the boundary layers are discussed and presented graphically for the parametric ***,the skin-friction,wall couple stress,surface heat transfer and mass transfer rate dependency on the emerging thermo-physical parameters are also *** finite element code is benchmarked with the results reported in the literature to check the validity and accuracy under some limiting cases and excellent agreement with published solutions is achieved.

关键词： Hall current Chemical reaction micropolar fluid magnetohydrodynamic(mHD) Finite elementmethod(FEm)

On Lateral-Torsional Buckling of Non-Local Beams

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 Applied mathematics and mechanics 2010年第3期2卷 389-398页

作者： N.Challamel C.m.Wang UniversitéEuropéenne de Bretagne INSA de Rennes-LGCGM20avenue des Buttes de Coësmes35043 Rennes cedexFrance Department of Civil Engineering National University of SingaporeKent Ridge CrescentSingapore 119260

Nonlocal continuum mechanics allows one to account for the small length scale effect that becomes significant when dealing with micro-or *** paper deals with the lateral-torsional buckling of elastic nonlocal small-scale ***’s model is chosen for the nonlocal constitutive bendingcurvature *** effect of prebuckling deformation is taken into consideration on the basis of the Kirchhoff-Clebsch *** is shown that the application of Eringen’s model produces small-length scale terms in the nonlocal elastic lateraltorsional buckling moment of a hinged-hinged strip ***,the non-local parameter has the effect of reducing the critical lateral-torsional buckling *** tendency is consistent with the one observed for the in-plane stability analysis,for the lateral buckling of a hinged-hinged axially loaded *** lateral buckling solution can be derived from a physically motivated variational principle.

关键词： Lateral-torsional buckling Kirchhoff-Clebsch theory Eringen’s model nonlocal theory nanostructures

Few-shot learning for biotic stress classification of coffee leaves

在线全文

维普期刊数据库

学校读者我要写书评

暂无评论

Artificial Intelligence in Agriculture 2022年第1期6卷 55-67页

作者： Lucas m.Tassis Renato A.Krohling LABCIN-Nature Inspired Computing Lab Federal University of Espirito SantoAv.Fernando Ferrari514CEP29075-910 VitóriaEspırito SantoESBrazil PPGI-Graduate Program in Computer Science Federal University of Espirito SantoAv.Fernando Ferrari514CEP 29075-910VitóriaEspírito SantoESBrazil

In the last few years,deep neural networks have achieved promising results in several ***,one of the main limitations of these methods is the need for large-scale datasets to properly ***-shot learning methods emerged as an attempt to solve this *** the few-shot learning methods,there is a class of methods known as embedding learning or metric *** methods tackle the classification problem by learning to compare,needing fewer training *** of the main problems in plant diseases and pests recognition is the lack of large public datasets *** to this difficulty,the field emerges as an intriguing application to evaluate the few-shot learning *** field is also relevant due to the social and economic importance of agriculture in several *** this work,datasets consisting of biotic stresses in coffee leaves are used as a case study to evaluate the performance of few-shot learning in classification and severity estimation *** achieved competitive results compared with the ones reported in the literature in the classification task,with accuracy values close to 96%.Furthermore,we achieved superior results in the severity estimation task,obtaining 6.74%greater accuracy than the baseline.

关键词： Plant diseases and pests classification Image classification Few-shot learning meta-learning Convolutional neural networks