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Found 6374 publications

MHD Casson nanofluid flow over a vertical stretchable sheet saturated with a porous medium: a parametric approach for sensitive analysis

Noreen Sher Akbar Assmaa Abd-Elmonem Syed M. Hussain Khurram Javid Wasim Jamshed Shakil Shaiq Hijaz Ahmad Kamel Guedri Abbas Khan

Publication Name: Discover Nano

Publication Date: 2026-12-01

Volume: 21

Issue: 1

Page Range: Unknown

Description:

Purpose: After being motivated by the diverse applications of blood rheology, nanotechnology, magnetic field, chemical reaction, solar radiation, and non-Darcy porous media in nano-industrial, medical, and chemical engineering domains. The current computational study aims to numerically examine the influences of velocity slip, internal thermal generation or absorption, chemical reactions, and thermal radiation on magneto-hydrodynamic blood-based nanofluid flow with thermo-Brownian motion through an extending interface within a high-permeability medium. Furthermore, the sensitive analysis of flow features with respect to the independent flow parameters is considered. Design/methodology/approach: Suitable similarity equations are employed to convert the partial differential equations into ordinary differential equations together with their boundary constraints. The NDSolve method in Mathematica 11.0 is employed to numerically analyze the flow model, yielding data for the stream function, velocity profile, frictional force coefficient, temperature profile, concentration profile, local Nusselt number, and Sherwood number across several rheological parameters. Main findings: A boundary slip diminishes momentum transmission from the fluid to the surface; when velocity slip escalates, the velocity profile declines. The intensity of the thermal boundary layer escalates with the thermal Grashof number. The temperature distribution is exacerbated by the influence of radiation. As the Brownian parameter grows, the nanofluid temperature intensifies. The chemical reaction parameter substantially affects the enhancement of both skin friction and the Sherwood number. The Nusselt number is enhanced by increasing the thermal Grashof number. The sensitivity analysis indicates that the chemical reaction and concentration Grashof number significantly influence the improvement of rheological properties. Applications: The results of this work are relevant for regulating film thickness, chemical vapour deposition, drug delivery systems, and process optimization.

Open Access: Yes

DOI: 10.1186/s11671-026-04667-7

Stability analysis of a fractional prey–predator model with Holling type III functional response and disease in both populations

D. U. Ozsahin L. Shangerganesh Ilker Ozsahin V. Govindaraj Hijaz Ahmad S. Hariharan Halet Ismail D. U. Ozsahin

Publication Name: Network Modeling Analysis in Health Informatics and Bioinformatics

Publication Date: 2026-12-01

Volume: 15

Issue: 1

Page Range: Unknown

Description:

This paper develops and analyzes a fractional-order predator–prey model with Holling type III functional response, incorporating the transmission of a contagious disease between both populations. We first establish the existence, uniqueness, non-negativity, and boundedness of solutions for the fractional-order system. The local stability of the model’s equilibrium points is examined, and the global stability is rigorously proved using a suitable Lyapunov function. We also investigate the effects of disease transmission on the predator–prey dynamics by identifying multiple equilibria, threshold parameters, and stability conditions. In particular, we analyze the existence of Hopf bifurcation at the endemic equilibrium point through bifurcation analysis, revealing the possible emergence of periodic oscillations. Analytical results are complemented by numerical simulations, highlighting the importance of incorporating both Holling type III predation and disease transmission when assessing prey–predator coexistence.

Open Access: Yes

DOI: 10.1007/s13721-025-00692-1

Characterization of serratia species and qualitative detection of serratia marcescens in raw and pasteurized milk by an analytical method based on polymerase chain reaction

E. Korcz Z. Kerényi László Varga

Publication Name: Elelmiszervizsgalati Kozlemenyek

Publication Date: 2021-01-01

Volume: 67

Issue: 2

Page Range: 3453-3464

Description:

Serratia species are opportunistic pathogenic microorganisms primarily known as nosocomial infectious agents, which can also cause food quality problems. The appearance of the extracellular pigment-producing Serratia marcescens in cow’s milk causes its red discoloration, posing a challenge to the dairy industry and food certification laboratories. The detection of the bacterium by conventional procedures based on microbiological methods is time-consuming and labor-intensive, and in many cases does not lead to satisfactory results due to the competitive inhibitory effect of the accompanying microflora. Following the analysis of the relevant literature, the published endpoint PCR methods and the primers used for the detection of S. marcescens were evaluated in in silico and in vitro assays, and then the procedure was tested on farm milk samples. Using the method, a total of 60 raw and pasteurized milk samples were analyzed, more than half of which (i.e., 32) were identified as S. marcescens positive. The significance of our work is mainly represented by the application of the published test methods in food industry practice. Our results highlight to the importance of detecting this bacterial species.

Open Access: Yes

DOI: 10.52091/EVIK-2021/2-4-ENG

Mass optimization of gears

Imre Czinege

Publication Name: Periodica Polytechnica Mechanical Engineering

Publication Date: 2019-01-01

Volume: 63

Issue: 2

Page Range: 75-79

Description:

The paper deals with the mass optimization of gear pairs. The proposed material science based selection strategy uses an extended version of Ashby model, where the minimum value of mass as function of material parameters and density can be calculated. Comparative analyses have proved that applying the method proposed, various gear materials can be classified and ranked. It could be concluded that case or induction hardened steels and titanium alloys with appropriate surface treatment are the best solutions for high quality gear materials. The presented relationships for material parameters and geometry of gears help empirical or heuristic selection of proper materials.

Open Access: Yes

DOI: 10.3311/PPme.11648

Plastic Limited Numerical Modelling on Contact Friction Effects of Steel–Concrete Connection for Composite Bridges

Oveys Ghodousian János Szép Marco Domaneschi Majid Movahedi Rad Raffaele Cucuzza Daniel Gosztola

Publication Name: Buildings

Publication Date: 2024-09-01

Volume: 14

Issue: 9

Page Range: Unknown

Description:

This research employs plastic limit analysis to examine load combinations, contact interactions, and friction effects on steel–concrete connections. A nonlinear finite element model was developed using ABAQUS 2021, incorporating the concrete damage plasticity model and contact friction interactions. The model’s validity was confirmed through laboratory experiments. Results indicate that contact elements and friction between the top flange, concrete slab, and studs significantly influence structural behavior. Unlike conventional push-out tests, real deck–slab connections exhibit different load-displacement responses due to the self-weight and additional loads, such as vehicular traffic. Under horizontal loading, extensive failures with large deformations along the studs occur, while vertically compressive loads lead to failures around the connections.

Open Access: Yes

DOI: 10.3390/buildings14092898

Preface I

Vikas Sharma Attila Kurucz Ewelina Idziak Vikas Sharma José Braga de Vasconcelos

Publication Name: World Sustainability Series

Publication Date: 2026-01-01

Volume: Part F1269

Issue: Unknown

Page Range: vii

Description:

No description provided

Open Access: Yes

DOI: DOI not available

Investigation of the tribological properties of nano-scaled ZrO2 and CuO additive in automotive lubricants

Jan Knaup D. Tóth

Publication Name: Iop Conference Series Materials Science and Engineering

Publication Date: 2020-08-25

Volume: 903

Issue: 1

Page Range: Unknown

Description:

To improve the fuel efficiency and the lifetime of the internal combustion engines, the lubricants and their additives have to be developed further. One of the possible future engines lubricants can be the nano-sized ceramic particles, which can provide positive tribological properties also in the presence of non-metallic surface materials. This paper presents the results of investigations with the help of ZrO2 and CuO nano-sized ceramic particles. To define the tribological properties of these additives, lubricant samples with different additive-concentrations were prepared and tribologically analysed. The frictional losses of these lubricant samples were analysed by a ball-on-disk sliding friction machine. The worn surface on the test specimens was analysed by different high-resolution microscopes. To define the functional mechanisms of the nano-additives, the worn surfaces were investigated by high resolution scanning electron microscopes. The ZrO2 additive has experimentally shown an excellent wear reduction property (over 40% wear reduction compared with the neat Group 3 base oil) at the optimum mixing concentration of 0.4wt%. Both frictional and wear reduction properties could be determined at the application of CuO additive (15-15% friction coefficient and wear scar diameter reduction) at its optimum concentration (0.5wt%). A copper-yellow layer can be seen on the worn surface of the disc specimens with CuO, which indicates the mechanism of chemical transformation to elementary copper from the cupric-oxide nanoparticle and this elementary copper can be melted on the surface, because of the applied high temperature and high loads during the experiments.

Open Access: Yes

DOI: 10.1088/1757-899X/903/1/012015

Preliminary Study on the Optimal Calibration of High Damping Rubber Bearings

Marco Domaneschi Majid Movahedi Rad Raffaele Cucuzza Giuseppe Carlo Marano Santiago Londoño López Santiago Londono Lopez Rita Greco

Publication Name: Lecture Notes in Civil Engineering

Publication Date: 2025-01-01

Volume: 770 LNCE

Issue: Unknown

Page Range: 226-239

Description:

Seismic isolation emerged as an efficient technology for seismic protection. It has been proven to simultaneously reduce inter-story drift demands and horizontal accelerations in buildings when properly implemented. Since the 80s, several numerical models appeared in literature to simulate the dissipative behaviour of High Damping Rubber Bearings (HDRB) devices under different acting scenarios. Despite the efforts provided by several authors to reproduce the real behaviour of such devices through the definition of efficient numerical models, the variability of laws’ parameters in the mass-production series of devices should receive further investigations. This research presents the preliminary results pointed out by an identification procedure of no.2 existing literature models with an increasing level of computation effort. The reliability of the numerical outputs and the goodness of each numerical model have been demonstrated by comparing them with experimental tests obtained from the SISMALAB laboratory. Experimental data are composed of no. 5 samples of the same devices, subjected to both compression forces and horizontal displacement under sinusoidal cyclic deformation. The optimal values of each device have been obtained by performing an optimization process where the difference between experimental and numerical behaviour has been minimized. The well-known Genetic Algorithm has been chosen for this purpose.

Open Access: Yes

DOI: 10.1007/978-3-032-08407-1_20

Two new species of Oribatella (Acari, Oribatida, Oribatellidae) from Guatemala

Sergey G. Ermilov Jenő Kontschán

Publication Name: International Journal of Acarology

Publication Date: 2024-01-01

Volume: 50

Issue: 6

Page Range: 515-521

Description:

Two new species of oribatid mites of the genus Oribatella (Oribatida, Oribatellidae)—O. paradechambrierisp. nov. and O. parastrinatiisp. nov.—are described, based on adults collected from rainforest litter in Guatemala. Oribatella paradechambrierisp. nov. is similar to O. dechambrieri but differs by the smaller body size, the length of the teeth of the lamellae, the relative length of the free distal and fixed mediobasal parts of the lamella, the size of the trapezoid region in basal part of the prodorsum, and the length of the interlamellar seta. Oribatella parastrinatiisp. nov. is similar to O. strinatii but differs by the smaller body size, the morphology of the rostrum, the morphology of the tutorial cusp, the presence of large dense foveolae in the centrodorsal part of the notogaster and between the genital and anal apertures, and dense short transverse ridges on the medioposterior part of the notogaster, and the number of genital setae. Oribatella dechambrieri is the first record of the species for Guatemala. The belonging of O. paradechambrieri to the genus Fenestrobates is discussed. http://www.zoobank.org/urn:lsid:zoobank.org:pub:5F474B0F-7E2B-42CC-9252-E5C41D17FE96.

Open Access: Yes

DOI: 10.1080/01647954.2024.2373983