Results 21 to 30 of about 1,769,613 (260)

An Experimental Study on Mechanical Modeling of Ceramics Based on Microstructure

open access: yesApplied Sciences, 2015
The actual grinding result of ceramics has not been well predicted by the present mechanical models. No allowance is made for direct effects of materials microstructure and almost all the mechanical models were obtained based on crystalline ceramics.
Ya-Nan Zhang   +4 more
doaj   +1 more source

A mathematical model to study the spread of COVID-19 and its control in India

open access: yesComputational and Mathematical Biophysics, 2023
In this article, a nonlinear mathematical model is proposed and analyzed to study the spread of coronavirus disease (COVID-19) and its control. Due to sudden emergence of a peculiar kind of infection, no vaccines were available, and therefore, the ...
Naresh Ram   +3 more
doaj   +1 more source

A streamlined method for chiral fermions on the lattice [PDF]

open access: yes, 1992
We discuss the use of renormalization counterterms to restore the chiral gauge symmetry in a lattice theory of Wilson fermions. We show that a large class of counterterms can be implemented automatically by making a simple modification to the fermion ...
Bodwin, Geoffrey T., Kovacs, Eve V.
core   +3 more sources

Spin-axion coupling [PDF]

open access: yes, 2015
We establish a new covariant phenomenological model, which describes an influence of pseudoscalar (axion) field on spins of test massive particles. The model includes general relativistic equations of particle motion and spin evolution in background ...
Balakin, Alexander B.   +1 more
core   +2 more sources

Hiệu quả đổi mới các doanh nghiệp tại Việt Nam

open access: yesTạp chí Khoa học Đại học Cần Thơ, 2020
Bài viết này nhằm mục đích phân tích hiệu quả đổi mới các doanh nghiệp tại Việt Nam. Số liệu trong nghiên cứu được trích ra từ cuộc khảo sát các doanh nghiệp tại Việt Nam của World Bank năm 2015, nghiên cứu trích dữ liệu từ 442 doanh nghiệp trong cuộc ...
Nguyễn Hoàng Minh
doaj   +1 more source

Modeling, Analysis and Physics Informed Neural Network approaches for studying the dynamics of COVID-19 involving human-human and human-pathogen interaction

open access: yesComputational and Mathematical Biophysics, 2022
In this work, the dynamics of the spread of COVID-19 is considered in the presence of both human-to-human transmission as well as environment-to-human transmission.
Nguyen Long   +2 more
doaj   +1 more source

Mathematical model of Ehrlichia chaffeensis transmission dynamics in dogs

open access: yesJournal of Biological Dynamics, 2023
Ehrlichia chaffeensis is a tick-borne disease transmitted by ticks to dogs. Few studies have mathematical modelled such tick-borne disease in dogs, and none have developed models that incorporate different ticks' developmental stages (discrete variable ...
Folashade B. Agusto   +2 more
doaj   +1 more source

Global stability dynamics and sensitivity assessment of COVID-19 with timely-delayed diagnosis in Ghana

open access: yesComputational and Mathematical Biophysics, 2022
In this paper, we study the dynamical effects of timely and delayed diagnosis on the spread of COVID-19 in Ghana during its initial phase by using reported data from March 12 to June 19, 2020. The estimated basic reproduction number, ℛ0, for the proposed
Moore Stephen E.   +4 more
doaj   +1 more source

Ferromagnetism of the 1-D Kondo Lattice Model: A Quantum Monte Carlo Study

open access: yes, 1992
The one dimensional Kondo lattice model is investigated using Quantum Monte Carlo and transfer matrix techniques. In the strong coupling region ferromagnetic ordering is found even at large band fillings.
Troyer, Matthias, Würtz, Diethelm
core   +1 more source

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