Results 101 to 110 of about 4,727,160 (263)

Modified Newtonian dynamics and the Coma cluster

The Astronomical Journal, 1988
The consistency of Milgrom's theory of modified Newtonian dynamics is checked against optical and X-ray data for the Coma cluster of galaxies. It is found that viable models for the cluster containing no dark matter can be constructed. They require an extensive gaseous atmosphere through which galaxies move on near-radial orbits. The gas temperature is
Lih Sin The, Simon D. M. White
openaire   +1 more source

Probing the Nature of Gravity in the Low-acceleration Limit: Wide Binaries of Extreme Separations with Perspective Effects

The Astrophysical Journal
Recent statistical analyses of wide binaries have revealed a boost in gravitational acceleration with respect to the prediction by Newtonian gravity at low internal accelerations ≲10 ^−9 m s ^−2 .
Youngsub Yoon, Yong Tian, Kyu-Hyun Chae
doaj   +1 more source

EFFECTS OF HEMATOCRIT VARIATION ON BLOOD FLOW IN A SEGMENT WITH ANEURYSM OF THE POSTERIOR CEREBRAL ARTERY

Mağallaẗ Al-kūfaẗ Al-handasiyyaẗ
This article provides a full numerical analysis of blood flow dynamics in a major vascular segment from the lateral surface of the cerebral peduncle to the posterior edge of the midbrain (P2P), which possessed an aneurysm that was identified at a point ...
Chris Naguib, Amr Guaily, Moustafa Elhagri, Ahmed Elakhdar, Mohammed A. Boraey, Mohamed Elshabrawy   +5 more
doaj   +1 more source

Rheological Properties of Carboxymethyl Cellulose Solutions and Gels: An Overview

Journal of Applied Polymer Science, EarlyView.
The rheology of carboxymethyl cellulose is determined by the balance between electrostatic interactions, chain entanglements and association of unsubstituted cellulose‐like domains. The degree of substitution, substitution pattern, added salt concentration and pH determine whether solutions behave as viscoelastic liquids or weak gels.
Carlos G. Lopez
wiley   +1 more source

Modified Newtonian dynamics and its implications

, 2003
Milgrom has proposed that, the appearance of discrepancies between the Newtonian dynamical mass and the directly observable mass in astronomical systems could be due to a breakdown of Newtonian dynamics in the limit of low accelerations rather than the ...
Sanders, RH
core   +2 more sources

Open Star Clusters and Their Asymmetrical Tidal Tails

The Astrophysical Journal
Stars that evaporate from their star cluster by the energy equipartition process end up in either a leading or a trailing tidal tail. In Newtonian gravitation and for open star clusters in the solar vicinity, the tidal threshold, or práh, for escape is ...
Pavel Kroupa, Jan Pflamm-Altenburg, Sergij Mazurenko, Wenjie Wu, Ingo Thies, Vikrant Jadhav, Tereza Jerabkova   +6 more
doaj   +1 more source

Modified magnetic flow of Williamson nanofluid over a stretching sheet with Newtonian heating

Data Analytics and Applied Mathematics
In systems where heat transfer and flow dynamics are crucial, the Williamson nanofluid model is a useful tool for studying non-Newtonian fluids. Numerous industrial applications, such as energy systems, manufacturing processes, and thermal management ...
Nur Syamilah Arifin, Abdul Fatah Zainuddin, Ahmad Khudzairi Khalid, Nur Intan Syafinaz Ahmad, Wan Munirah Wan Mohamad, Abdul Rahman Mohd Kasim, Imran Ullah   +6 more
doaj   +1 more source

On the Status of the Geodesic Principle in Newtonian and Relativistic Physics [PDF]

, 2011
A theorem due to Bob Geroch and Pong Soo Jang ["Motion of a Body in General Relativity." Journal of Mathematical Physics 16(1), (1975)] provides a sense in which the geodesic principle has the status of a theorem in General Relativity (GR).
Weatherall, James Owen, James Owen Weatherall   +1 more
core   +1 more source

Process Optimization of Solution Blow Spinning for Poly (N‐Isopropylacrylamide) Fibers

Journal of Applied Polymer Science, EarlyView.
Solution blow spinning has emerged as a safe and scalable technique for fabricating thermoresponsive PNIPAM fibers. The influence of key parameters on jet stability and fiber uniformity is determined through both rheological analysis and statistical process optimization. A Box–Behnken design reveals an optimized window for producing PNIPAM fibers below
Maryam Parastar, Filipe de Almeida Araujo, Uttandaraman Sundararaj   +2 more
wiley   +1 more source

On the Evidence for the Violation of the Equivalence Principle in Disk Galaxies

Particles
We examine the claimed observations of a gravitational external field effect (EFE) reported by Chae et al. We show that observations suggestive of the EFE can be interpreted without violating Einstein’s equivalence principle, namely from known ...
Corey Sargent, William Clark, Antonia Seifert, Alicia Mand, Emerson Rogers, Adam Lane, Alexandre Deur, Balša Terzić   +7 more
doaj   +1 more source