Results 1 to 10 of about 3,033,628 (267)

Numerical Study on Effects of High-Frequency Arrayed Energy Deposition on Scramjet Combustor Performance [PDF]

open access: yesHangkong bingqi, 2023
For the supersonic flows have large momentum, it is difficult to get higher penetration depth because of the influence of transverse jet on incoming flow so as to affect the mixing and combustion efficiency of jet in scramjet combustor.
Cai Zilin, Gao Feng, Wang Hongyu, Ma Cenrui
doaj   +1 more source

Bonuses and pitfalls of a paperless drive-through screening and COVID-19: A field report

open access: yesJournal of Microbiology, Immunology and Infection, 2021
As the world witnessed the rapid spread of SARS-CoV-2, the World Health Organization has called for governing bodies worldwide to intensify case findings, contact tracing, monitoring, and quarantine or isolation of contacts with COVID-19.
Elly Lee   +3 more
doaj   +1 more source

VELOcities of CEpheids (VELOCE) [PDF]

open access: yesAstronomy & Astrophysics
We present the first data release of VELOcities of CEpheids (VELOCE), dedicated to measuring the high-precision radial velocities (RVs) of Galactic classical Cepheids (henceforth, Cepheids). The first data release (VELOCE DR1) comprises 18 225 RV measurements of 258 bona fide classical Cepheids on both hemispheres collected mainly between 2010 and 2022,
Anderson, Richard I.   +29 more
openaire   +7 more sources

Oscillatory Modes оf the Atmosphere оf Jupiter аnd Venus

open access: yesНаука. Инновации. Технологии, 2023
Introduction. The article studies the oscillatory modes of the atmosphere of two planets (Jupiter, Venus), taking into account the influence of axial rotation, which affects the occurrence of beating and resonance, and comparing their parameters with the
I. S. Afanasyev   +2 more
doaj   +1 more source

Negative Group Velocity [PDF]

open access: yes, 2000
The group velocity for pulses in an optical medium can be negative at frequencies between those of a pair of laser-pumped spectral lines. The gain medium then can amplify the leading edge of a pulse resulting in a time advance of the pulse when it exits ...
Hamilton W. R., Kirk T. McDonald
core   +4 more sources

Comparative study of gait parameters of patients undergoing distal femoral resections with non-operated and healthy limbs: a meta-analysis study

open access: yesFrontiers in Oncology, 2023
IntroductionGait analysis is one of the most important components of functional outcome evaluation in patients with lower-extremity tumors. Disparities between operated limbs when compared with non-operated limbs and healthy populations based on gait ...
Nishant Banskota   +4 more
doaj   +1 more source

Tidal streams, fish, and seabirds: Understanding the linkages between mobile predators, prey, and hydrodynamics

open access: yesEcosphere, 2022
Driven by the necessity to decarbonize energy sources, many countries are targeting tidal stream environments for power generation. However, these areas can act as foraging hotspots for marine top predators, such as seabirds.
Ana Couto   +7 more
doaj   +1 more source

High-Velocity Clouds in the Nearby Spiral Galaxy M 83 [PDF]

open access: yes, 2008
We present deep HI 21-cm and optical observations of the face-on spiral galaxy M 83 obtained as part of a project to search for high-velocity clouds (HVCs) in nearby galaxies.
Bart P. Wakker   +51 more
core   +2 more sources

Determination of coordinates of the earthquake hypocenter by the method of circles

open access: yesВестник Дагестанского государственного технического университета: Технические науки, 2021
Objective. The aim of the study is to develop a method for determining the coordinates of the earthquake hypocenter using various combinations of second and fourth order figures as a geo-locus of the hypocenter position points.Method.
G. K. Aslanov, T. G. Aslanov
doaj   +1 more source

Deep processes, velocity, heat and density models of the East Kamchatka upper mantle

open access: yesГеофизический журнал, 2020
For the velocity structure of the lithosphere of East Kamchatka, a tomographic model of high spatial resolution was constructed. Model demonstrates clear relation of velocity values in mantle with subsurface structure.
V.V. Gordienko   +2 more
doaj   +1 more source

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