12,782 research outputs found
Mental health and emotional well-being of students in further education - a scoping study
This study aimed to explore how FE colleges in England are engaging with and addressing the mental health needs of their young students (aged 16-19), both in terms of promoting positive mental health and emotional well-being and in responding to identified mental health problems
Unitarity of the infinite-volume three-particle scattering amplitude arising from a finite-volume formalism
In a previous publication, two of us derived a relation between the
scattering amplitude of three identical bosons, , and a real
function referred to as the {divergence-free} K matrix and denoted . The result arose in the context of a relation between
finite-volume energies and , derived to all orders in
the perturbative expansion of a generic low-energy effective field theory. In
this work we set aside the role of the finite volume and focus on the
infinite-volume relation between and .
We show that, for any real choice of ,
satisfies the three-particle unitarity constraint to all orders. Given that
is also free of a class of kinematic divergences,
the function may provide a useful tool for parametrizing three-body scattering
data. Applications include the phenomenological analysis of experimental data
(where the connection to the finite volume is irrelevant) as well as
calculations in lattice quantum chromodynamics (where the volume plays a key
role).Comment: 19 pages, 4 figures, JLAB-THY-19-2945, CERN-TH-2019-07
FSA field test report, 1980 - 1982
Photovoltaic modules made of new and developing materials were tested in a continuing study of weatherability, compatibility, and corrosion protection. Over a two-year period, 365 two-cell submodules have been exposed for various intervals at three outdoor sites in Southern California or subjected to laboratory acceptance tests. Results to date show little loss of maximum power output, except in two types of modules. In the first of these, failure is due to cell fracture from the stresses that arise as water is regained from the surrounding air by a hardboard substrate, which shrank as it dried during its encapsulation in plastic film at 150 C in vacuo. In the second, the glass superstrate is sensitive to cracking, which also damages the cells electrostatically bonded to it; inadequate bonding of interconnects to the cells is also a problem in these modules. In a third type of module, a polyurethane pottant has begun to yellow, though as yet without significant effect on maximum power output
The exposure history of the Apollo 16 site: An assessment based on methane and hydrolysable carbon
Nineteen soils from eight stations at the Apollo 16 landing site have been analyzed for methane and hydrolysable carbon. These results, in conjunction with published data from photogeology, bulk chemistry, rare gases, primordial and cosmogenic radionuclides, and agglutinate abundances have been interpreted in terms of differing contributions from three components-North and South Ray Crater ejecta and Cayley Plains material
Programmable telemetry system Patent
Time division multiplexed telemetry transmitting system controlled by programmed memor
Tunable subpicosecond electron bunch train generation using a transverse-to-longitudinal phase space exchange technique
We report on the experimental generation of a train of subpicosecond electron
bunches. The bunch train generation is accomplished using a beamline capable of
exchanging the coordinates between the horizontal and longitudinal degrees of
freedom. An initial beam consisting of a set of horizontally-separated beamlets
is converted into a train of bunches temporally separated with tunable bunch
duration and separation. The experiment reported in this Letter unambiguously
demonstrates the conversion process and its versatility.Comment: 4 pages, 5 figures, 1 table; accepted for publication in PR
A Crystal Structure of the Bifunctional Antibiotic Simocyclinone D8, Bound to DNA Gyrase
Simocyclinones are bifunctional antibiotics that inhibit bacterial DNA gyrase by preventing DNA binding to the enzyme. We report the crystal structure of the complex formed between the N-terminal domain of the Escherichia coli gyrase A subunit and simocyclinone D8, revealing two binding pockets that separately accommodate the aminocoumarin and polyketide moieties of the antibiotic. These are close to, but distinct from, the quinolone-binding site, consistent with our observations that several mutations in this region confer resistance to both agents. Biochemical studies show that the individual moieties of simocyclinone D8 are comparatively weak inhibitors of gyrase relative to the parent compound, but their combination generates a more potent inhibitor. Our results should facilitate the design of drug molecules that target these unexploited binding pockets
Air Traffic Simulation Technology for High-Population Metroplexes
IAI's MetroSim optimizes air traffic by simulating departures, arrivals, and activity in air and onthe ground in busy metroplexes, where flights impact each other at a single airport and among traffic at nearby airports. MetroSim evolved out of several NASA SBIR/STTR Awards and has since been used by NASA for flight simulation analysis. MetroSim has also been integrated with FAA and DOT technology, has produced studies for the Port Authority of New York and New Jersey, and is under development to support the Nav
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