Results 71 to 80 of about 1,081 (308)
Numerical optimization of Hall effect thruster with variation in magnetic field
FirePhysChemIn the present study, numerical analyses were conducted to enhance the strength of the magnetic field. While electromagnetic coils and permanent magnets have conventionally been used for this purpose, the study explores the utilization of superconducting
Harshit Shukla +2 more
doaj +1 more source
Australian Journal of Social Issues, EarlyView.ABSTRACT Robust measurement of disadvantage is essential to identifying and addressing inequities in children's development. We tested how a multidimensional framework of child disadvantage performed relative to a traditional socioeconomic position (SEP) approach to predict developmental outcomes.
Wei Hong +7 more
wiley +1 more source
The Anatomical Record, EarlyView.A new musculoskeletal reconstruction and revision of the cranio‐mandibular anatomy of the Devonian arthrodire placoderm Dunkleosteus terrelli from a comparative and functional anatomical perspective. Dunkleosteus is a specialized arthrodire with many specializations for feeding on large vertebrates, and many of its features are part of broader ...
Russell K. Engelman +4 more
wiley +1 more source
Design and Simulation of a Miniature Hall-Effect Thruster
, 2018 Hall-Effect Thrusters are one of the simpler designs of modern Electric Propulsion (EP) systems, with one of the highest efficiency rates. They use a crossed electric and magnetic field to generate the known Hall current from which the device derives its
McCraw, Hunter +2 more
core
Empirical electron cross-field mobility in a Hall effect thruster
, 2009 International audienceElectron transport across the magnetic field in Hall effect thrusters is still an open question. Models have so far assumed 1/B2 or 1/B scaling laws for the “anomalous” electron mobility, adjusted to reproduce the integrated ...
J. Pérez-Luna +11 more
core +1 more source
The Anatomical Record, EarlyView.Abstract The study of morphological evolution is fundamentally tied to ontogeny, yet studies of these heterochronic processes in the fossil record are rare. Fossils belonging to an ontogenetic series are difficult to assign to an ontogenetic stage due to inconsistent proxies for skeletal ages, challenging to taxonomically assign due to morphological ...
Erika R. Goldsmith, Michelle R. Stocker
wiley +1 more source
Hall-Effect Thruster Utilizing Bismuth as Propellant
, 2008 A laboratory-model Hall-effect spacecraft thruster was developed that utilizes bismuth as the propellant. Xenon was used in most prior Hall-effect thrusters.
Robin, Mike +3 more
core
Effect of cathode position on Hall-effect thruster performance and near-field plume properties
, 2008 Thruster efficiency and plume properties, including ion energy distributions and beam current density profiles, of a Hall-effect thruster are compared when the cathode is placed in nine radial positions relative to the thruster and at three cathode mass ...
Lyon King +3 more
core +1 more source
Experimental Investigations of a Krypton Stationary Plasma Thruster
International Journal of Aerospace Engineering, 2013 Stationary plasma thrusters are attractive electric propulsion systems for spacecrafts. The usual propellant is xenon. Among the other suggested propellants, krypton could be one of the best candidates.
A. I. Bugrova +5 more
doaj +1 more source
Archaeology in Oceania, EarlyView.ABSTRACT Gold discoveries transformed the 19th century British colony of Queensland, Australia, driving migration, a second wave of pastoral expansion northwards, and an increasingly diverse population. This study presents a comparative and contextual zooarchaeological analysis of British and southern Chinese food waste—globally significant migrant ...
Marc Cheeseman
wiley +1 more source