Results 41 to 50 of about 2,640,441 (306)

Padé Approximant and Minimax Rational Approximation in Standard Cosmology

open access: yesGalaxies, 2016
The luminosity distance in the standard cosmology as given by ΛCDM and, consequently, the distance modulus for supernovae can be defined by the Padé approximant.
Lorenzo Zaninetti
doaj   +1 more source

Random Dynamic Response Characteristics of Pipeline Subjected to Blasting Cylindrical SH Waves

open access: yesShock and Vibration, 2021
It is essential to investigate the influence of blasting vibrations on pipelines, and the dynamic response is the crux in the safety issues. At present, the blasting seismic wave is usually regarded as a plane wave.
Shiwei Lu, Heng Zhang, Ling Ji
doaj   +1 more source

Effect of Centrifugal Force on Power Output of a Spin-Coated Poly(Vinylidene Fluoride-Trifluoroethylene)-Based Piezoelectric Nanogenerator

open access: yesEnergies, 2023
While poly(vinylidene fluoride-trifluoroethylene) (P(VDF-TrFE)) film is an excellent piezoelectric material for mechanical energy harvesting, the piezoelectric output varies considerably with the spin coating conditions.
Dong Geun Jeong   +3 more
doaj   +1 more source

Numerical Analysis of Occupant Head Injuries in Impacts with Dump Truck Panel

open access: yesApplied Bionics and Biomechanics, 2018
The human head will inevitably impact on the panel causing injury due to the inertia during dump truck collisions or emergency braking. Therefore, this paper aims to analyze the effects of panel design parameters on occupant head injuries via simulations
Shence Wang, Deshun Liu, Zhihua Cai
doaj   +1 more source

STUDY ON MECHANICAL PROPERTIES OF POROUS STRUCTURES BASED ON TPMS

open access: yesJixie qiangdu, 2022
In order to explore the influence of different TPMS pore structures on the mechanical properties of the porous scaffold, TPMS expressed by implicit function was used as the basic pore unit to construct the micro-porous structure.
WANG MaoHua   +5 more
doaj  

The Hubble Diagram: Jump from Supernovae to Gamma-ray Bursts

open access: yesUniverse, 2022
The Hubble diagram (HD) is a plot that contains a luminous distance modulus presented with respect to the redshift. The distance modulus–redshift relation of the most well-known “standard candles”, the type Ia supernovae (SN), is a crucial tool in ...
Nikita Yu. Lovyagin   +3 more
doaj   +1 more source

Local Glass Transition Temperature Tg(z) Within Polystyrene Is Strongly Impacted by the Modulus of the Neighboring PDMS Domain.

open access: yesACS Macro Letters, 2020
Profiles in the local glass transition temperature Tg(z) within polystyrene (PS) next to polydimethylsiloxane (PDMS) domains were determined using a localized fluorescence method.
Yannic J Gagnon, C. Roth
semanticscholar   +1 more source

Ages of globular clusters: breaking the age-distance degeneracy with the luminosity function [PDF]

open access: yes, 1996
We extend our previous method to determine globular cluster ages using the luminosity function (Jimenez \& Padoan 1996). We show that the luminosity function depends on both age and distance modulus and that it is possible to distinguish between the two.
arxiv   +1 more source

A Precise Distance to the Host Galaxy of the Binary Neutron Star Merger GW170817 Using Surface Brightness Fluctuations [PDF]

open access: yes, 2018
The joint detection of gravitational waves (GWs) and electromagnetic radiation from the binary neutron star (BNS) merger GW170817 has provided unprecedented insight into a wide range of physical processes: heavy element synthesis via the r-process; the ...
M. Cantiello   +27 more
semanticscholar   +1 more source

BV CCD Photometry of M71: Distance and Age [PDF]

open access: yesJournal of Astronomy and Space Sciences, 2004
We present BV CCD photometry of metal-rich globular cluster M71. Based on our color-magnitude diagram (CMD), we derive the distance to M71 using a sample of Hipparcos subdwarfs of similar metallicity. Our distance modulus is (m-M)V=13.46(± 0.17).
Hong-Suh Yim   +3 more
doaj   +1 more source

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