Free‐Fall Non‐Universality in Quantum Theory
Sign Up to like & getrecommendations! Published in 2022 at "Annalen der Physik"
DOI: 10.1002/andp.202200386
Abstract: We show by embodying the Einstein equivalence principle - local Poincar\'{e} invariance - and general covariance in quantum theory that wave-function spreading rules out the universality of free fall, i.e. the free-fall trajectory of a… read more here.
Keywords: fall; quantum theory; fall non; non universality ... See more keywords
Evaluation of the drag coefficients of tree crowns by numerical modeling of their free fall
Sign Up to like & getrecommendations! Published in 2018 at "Agricultural and Forest Meteorology"
DOI: 10.1016/j.agrformet.2018.03.020
Abstract: Abstract The method for evaluation of wind loads and drag coefficients for the trees of different species, size and morphology in natural conditions that does not require special equipment is presented for the first time.… read more here.
Keywords: free fall; drag coefficients; evaluation; tree stem ... See more keywords
Steam gasification of land, coastal zone and marine biomass by thermal gravimetric analyzer and a free-fall tubular gasifier: Biochars reactivity and hydrogen-rich syngas production.
Sign Up to like & getrecommendations! Published in 2019 at "Bioresource technology"
DOI: 10.1016/j.biortech.2019.121495
Abstract: The steam gasification properties and kinetics, products distribution and syngas composition derived from land, coastal zone and marine biomass have been studied by TGA and free-fall tubular gasifier. Volume model, shrinking core model and random… read more here.
Keywords: steam gasification; free fall; fall tubular; tubular gasifier ... See more keywords
In situ undrained shear strength characterization using data from free fall ball penetrometer tests
Sign Up to like & getrecommendations! Published in 2018 at "Computers and Geotechnics"
DOI: 10.1016/j.compgeo.2017.12.006
Abstract: Abstract Large-deformation finite element analyses (FEAs) employing coupled Eulerian-Lagrangian technique are performed to simulate penetration of a spherical free fall penetrometer (FFP) in clay. FEA results are analyzed following the principle of energy conservation. Although… read more here.
Keywords: methodology; free fall; shear strength; undrained shear ... See more keywords
Measurement and prediction of the initial settlement of cube-type artificial reefs caused by free-fall installation using a laboratory-scale experiment, regression analysis, and numerical collision analysis
Sign Up to like & getrecommendations! Published in 2021 at "Ocean Engineering"
DOI: 10.1016/j.oceaneng.2021.108643
Abstract: Abstract Several studies have identified stability issues related to artificial reefs (ARs) installed on the seabed. However, initial AR settlement during free-fall installation has not been well examined. We performed a laboratory-scale experiment, regression analysis,… read more here.
Keywords: free fall; settlement; analysis; fall installation ... See more keywords
Shape of free-fall arch in quasi-2D silo
Sign Up to like & getrecommendations! Published in 2020 at "Particuology"
DOI: 10.1016/j.partic.2020.10.001
Abstract: Abstract In this study, the optical flow method is used to measure the velocity distribution of a granular flow in a rectangular quasi-two-dimensional silo. Using the velocity gradient, a free-fall arch (FFA) is obtained and… read more here.
Keywords: quasi; shape; fall arch; free fall ... See more keywords
Universality of free fall from the orbital motion of a pulsar in a stellar triple system
Sign Up to like & getrecommendations! Published in 2018 at "Nature"
DOI: 10.1038/s41586-018-0265-1
Abstract: Einstein’s theory of gravity—the general theory of relativity1—is based on the universality of free fall, which specifies that all objects accelerate identically in an external gravitational field. In contrast to almost all alternative theories of… read more here.
Keywords: white dwarf; universality free; system; free fall ... See more keywords
The free fall of an apple: conceptual subtleties and implications for physics teaching
Sign Up to like & getrecommendations! Published in 2018 at "European Journal of Physics"
DOI: 10.1088/1361-6404/aaa91d
Abstract: The study of free fall is thoroughly present in physics teaching at all levels. From the point of view of Newtonian dynamics it appears to be extremely simple, as it consists of a two-body problem… read more here.
Keywords: physics teaching; free fall; conceptual subtleties; physics ... See more keywords
Free fall of a symmetrical gyroscope in vacuum
Sign Up to like & getrecommendations! Published in 2021 at "European Journal of Physics"
DOI: 10.1088/1361-6404/ac1e7b
Abstract: This paper describes the behavior of a symmetrical gyroscope when it falls down from a certain height over the surface of the earth. The assumptions of the model are that (i) the gravitational acceleration has… read more here.
Keywords: gyroscope; lean angle; free fall; fall symmetrical ... See more keywords
Isotope-selective high-order interferometry with large organic molecules in free fall
Sign Up to like & getrecommendations! Published in 2018 at "New Journal of Physics"
DOI: 10.1088/1367-2630/aaade2
Abstract: Interferometry in the time domain has proven valuable for matter-wave based measurements. This concept has recently been generalized to cold molecular clusters using short-pulse standing light waves which realized photo-depletion gratings, arranged in a time-domain… read more here.
Keywords: order; free fall; interferometry; organic molecules ... See more keywords
Diffraction of particles in free fall
Sign Up to like & getrecommendations! Published in 2018 at "Physical Review A"
DOI: 10.1103/physreva.98.043618
Abstract: The problem of a beam of quantum particles falling through a diffractive screen is studied. The solutions for single and double slits are obtained explicitly when the potential is approximated by a linear function. It… read more here.
Keywords: diffraction; diffraction particles; particles free; free fall ... See more keywords