Results 31 to 40 of about 9,463,996 (246)

On compositions of numbers and graphs

open access: yesCoRR, 2007
The main purpose of this note is to pose a couple of problems which are easily formulated thought some seem to be not yet solved. These problems are of general interest for discrete mathematics including a new twig of a bough of theory of graphs i.e. a given graph compositions.
openaire   +3 more sources

Narayana numbers and Schur–Szegő composition

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

Determination of the Optimum formula for Composite Motor Gasoline Octane Number Blending Enhancer

open access: yesJournal of Engineering, 2019
To decrease the dependency of producing high octane number gasoline on the catalytic processes in petroleum refineries and to increase the gasoline pool, the effect of adding a suggested formula of composite blending octane number enhancer to motor ...
Alaa D. Jawad Al-Bayati   +2 more
doaj   +1 more source

Generating d-Composite Sandwich Numbers

open access: yesIntegers, 2015
See the abstract in the attached pdf.
Lenny Jones, Alicia Lamarche
openaire   +4 more sources

A Fibonacci-like Sequence of Composite Numbers [PDF]

open access: yesThe Electronic Journal of Combinatorics, 1999
In 1964, Ronald Graham proved that there exist relatively prime natural numbers $a$ and $b$ such that the sequence $\{A_n\}$ defined by $$ {A}_{n} =A_{n-1}+A_{n-2}\qquad (n\ge 2;A_0=a,A_1=b)$$ contains no prime numbers, and constructed a 34-digit pair satisfying this condition. In 1990, Donald Knuth found a 17-digit pair satisfying the same conditions.
openaire   +3 more sources

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

Influence of in vitro irrigation protocols on root canal treatment for bond strength to enamel and coronary dentin

open access: yesSaudi Endodontic Journal, 2021
Introduction: The purpose of this study was to evaluate the effects of different concentrations of chitosan solution used as a final rinse after root canal treatment on the shear bond strength of composite resin to enamel and coronary dentin.
Vanessa Lessa Araújo   +6 more
doaj   +1 more source

Heat Transfer in Composite Cylinders Under Harmonically Oscillating Ambient Conditions

open access: yesAppliedMath
An analytical solution is presented for transient heat conduction in a two-layer composite cylinder subjected to outer-surface convection with a general time-dependent ambient temperature.
Rajai S. Alassar   +3 more
doaj   +1 more source

Solid Pseudopapillary Neoplasm of the Pancreas in Children and Adolescents: Expert Recommendations

open access: yesPediatric Blood &Cancer, EarlyView.
ABSTRACT Solid pseudopapillary neoplasm of the pancreas (SPN) is a rare low‐grade malignant exocrine pancreatic tumor, mostly discovered during the second decade of life in females, with a very good prognosis, provided microscopically complete surgical excision is achieved.
Sabine Irtan   +18 more
wiley   +1 more source

Magnetic‑Field‑Assisted Thermoplastic Composite Shaping: Heat‐softened Volumetric Reconfiguration for Accelerated Manufacturing

open access: yesMacromolecular Materials and Engineering
Additive manufacturing (AM) of multifunctional thermoplastic composites faces persistent trade‑offs among speed, geometric complexity, and property control.
Hamed Yazdani Nezhad
doaj   +1 more source

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