Results 21 to 30 of about 566,663 (314)

Preparation of ZnO/Brucite Functional Composite Powder by the Mechanochemical Method

open access: yesFrontiers in Materials, 2021
In this experiment, ZnO/brucite composite powder was prepared through the mechanochemical method; further, the properties, particle morphology, and structure of the composite powder were characterized. The results show that mechanical grinding action can
Huan Shuai   +4 more
doaj   +1 more source

On Highly Composite and Similar Numbers [PDF]

open access: yesTransactions of the American Mathematical Society, 1944
A (positive whole) number is called highly composite if it has more divisors than any smaller number, highly abundant if the sum of its divisors is greater than that for any smaller number, and superabundant if the sum of the reciprocals of its divisors is greater than that for any smaller number. The author uses \textit{A. E.
Alaoglu, Leon, Erdős, Pál
openaire   +1 more source

Tensile and Bending Strength Analysis of Ramie Fiber and Woven Ramie Reinforced Epoxy Composite

open access: yesJournal of Natural Fibers, 2021
This study aims to analyze the effect of the number of woven ramie layers (plies) and ramie fiber weight as reinforcement of composite on the tensile strength and bending strength.
Zulkifli Djafar   +2 more
doaj   +1 more source

The twentieth Fermat number is composite [PDF]

open access: yesMathematics of Computation, 1988
The twentieth Fermat number, F 20 = 2 2 20 + 1 {F_{20}
Young, Jeff, Buell, Duncan A.
openaire   +1 more source

Adaptive Speaker Recognition Based on Hidden Markov Model Parameter Optimization

open access: yesIEEE Access, 2020
The Hidden Markov Model (HMM) is a widely used method for speaker recognition. During its training, the composite order of the measurement probability matrix and the number of re-evaluations of the initial model affect the speed and accuracy of a ...
Yangjie Wei
doaj   +1 more source

The Preparation, Characterization, and Influence of Multiple Electroless Nickel-Phosphorus (Ni-P) Composite Coatings on Poplar Veneer

open access: yesBioResources, 2015
Nickel-Phosphorus (Ni-P) composite coatings were prepared on a poplar veneer surface via a simple electroless nickel (Ni) approach. The substrate deformation, flatness, crystalline structure, and wear resistance of the Ni-P composite coatings were ...
Yanfei Pan, Xin Wang, Jintian Huang
doaj   +1 more source

Compositional Bernoulli numbers

open access: yes, 2007
16 pages, to appear in Afr.
Blandin, Hector, Diaz, Rafael
openaire   +2 more sources

Highly Composite Numbers

open access: yes, 2023
The main result of this thesis is to show that there are only finitely many integers $n$ such that both $n$ and $d(n)$ are highly composite numbers at the same time, where $d(n)$ is the divisor function. Bertrand's postulate [4] is used many times throughout the thesis and allows us to write a proof that is as simple (and as short) as possible.
openaire   +2 more sources

Study on computational efficiency of composite schemes for convection-diffusion equations using single-grid and multigrid methods

open access: yesJournal of Thermal Science and Technology, 2015
The computational efficiency of different composite schemes for the convection terms of the convection-diffusion equations is systematically studied in this paper.
Jingfa LI   +4 more
doaj   +1 more source

Narayana numbers and Schur–Szegő composition

open access: yesJournal of Approximation Theory, 2009
zbMATH Open Web Interface contents unavailable due to conflicting licenses.
Kostov, Vladimir   +2 more
openaire   +2 more sources

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