Investigation of 4He3^{4}He_{3} trimer on the base of Faddeev equations in configuration space

Precise numerical calculations of bound states of a three-atomic Helium cluster are performed. The modern techniques of solution of Faddeev equations are combined to obtain an efficient numerical scheme. Binding energies and other observables for ground and excited states are calculated. Geometric properties of the clusters are discussed.Comment: uses elsart.sty, 9 tables, 5 PostScript figure

Ultra-low energy elastic scattering in a system of three He atoms

Differential Faddeev equations in total angular momentum representation are used for the first time to investigate ultra-low energy elastic scattering of a helium atom on a helium dimer. Six potential models of interatomic interaction are investigated. The results improve and extend the Faddeev equations based results known in literature. The employed method can be applied to investigation of different elastic and inelastic processes in three- and four-atomic weakly bounded systems below three-body threshold.Comment: 13 pages, 4 tables, 2 figures, elsar

Structural response of SSME turbine blade airfoils

Reusable space propulsion hot gas-path components are required to operate under severe thermal and mechanical loading conditions. These operating conditions produce elevated temperature and thermal transients which results in significant thermally induced inelastic strains, particularly, in the turbopump turbine blades. An inelastic analysis for this component may therefore be necessary. Anisotropic alloys such as MAR M-247 or PWA-1480 are being considered to meet the safety and durability requirements of this component. An anisotropic inelastic structural analysis for an SSME fuel turbopump turbine blade was performed. The thermal loads used resulted from a transient heat transfer analysis of a turbine blade. A comparison of preliminary results from the elastic and inelastic analyses is presented

An Assessment of the Eye Tracking Signal Quality Captured in the HoloLens 2

We present an analysis of the eye tracking signal quality of the HoloLens 2s integrated eye tracker. Signal quality was measured from eye movement data captured during a random saccades task from a new eye movement dataset collected on 30 healthy adults. We characterize the eye tracking signal quality of the device in terms of spatial accuracy, spatial precision, temporal precision, linearity, and crosstalk. Most notably, our evaluation of spatial accuracy reveals that the eye movement data in our dataset appears to be uncalibrated. Recalibrating the data using a subset of our dataset task produces notably better eye tracking signal quality.Comment: 10 pages, 10 figure

Rydberg-London Potential for Diatomic Molecules and Unbonded Atom Pairs

We propose and test a pair potential that is accurate at all relevant distances and simple enough for use in large-scale computer simulations. A combination of the Rydberg potential from spectroscopy and the London inverse-sixth-power energy, the proposed form fits spectroscopically determined potentials better than the Morse, Varnshi, and Hulburt-Hirschfelder potentials and much better than the Lennard-Jones and harmonic potentials. At long distances, it goes smoothly to the correct London force appropriate for gases and preserves van der Waals's "continuity of the gas and liquid states," which is routinely violated by coefficients assigned to the Lennard-Jones 6-12 form.Comment: Five pages, 10 figure

Physical Informal Learning Environment on Campus Ground: A Review

Past few decades, there has been a raft amplifying interest in higher education institutions, nationally and internationally, in the creation of new types of learning environment supporting learner-centered or constructivist pedagogy. This paper reviews the effectiveness of the physical informal learning environment initiated by learners outside their formal lecture hours in higher education. The aim of this paper is to present a synthesis of 40 studies from 1979 to 2016 on pyhsical informal learning setting on campus. Learning is the essential activity of colleges and universities. Commonly learning occurs in classrooms which identified as formal learning and sometimes its results from serendipitous interactions among individuals at transitional spaces which classified as informal learning. Space whether physical or virtual can have an impact on learning. Thus, it can bring people together, encourage exploration, collaboration, and discussion. Space can carry an unspoken message of silence which mentioned as the power of built pedagogy in colleges and universities. Nevertheless, the subject remains topical due to the dynamism of the variables, particularly the pedagogy, learning media, spaces, learners themselves and the study location. However, exploring the intermediate space as physical informal learning environment that affect students’ performance and satisfaction in higher education remain crucial and decisive among educators and researchers. Therefore, there is a growing interest in higher education institutions, nationally and internationally, in the creating of new types of learning environment supporting learnercentered or constructivist pedagogy. Hence, The Next Generation Learning Spaces project team (NGLS) under Australian Learning & Teaching Council ( The University Of Queensland) , explored the interdependence of pedagogy, space, and technology to develop the Pedagogy-Space-Technology (PST) framework which permits institutions to develop new teaching and learning setting that will strengthen student engagement and enhance learning outcomes. This paper contributes to the paramount significance of the quality informal learning environment in order to accomplish functional obligation and cater for learner’s emotional urgency for enthusiasm and touch of identity