2,927 research outputs found
NORSEX 1979 microwave remote sensing data report
Airborne microwave remote sensing measurements obtained by NASA Langley Research Center in support of the 1979 Norwegian Remote Sensing Experiment (NORSEX) are summarized. The objectives of NORSEX were to investigate the capabilities of an active/passive microwave system to measure ice concentration and type in the vicinity of the marginal ice zone near Svalbard, Norway and to apply microwave techniques to the investigation of a thermal oceanic front near Bear Island, Norway. The instruments used during NORSEX include the stepped frequency microwave radiometer, airborne microwave scatterometer, precision radiation thermometer and metric aerial photography. The data are inventoried, summarized, and presented in a user-friendly format. Data summaries are presented as time-history plots which indicate when and where data were obtained as well as the sensor configuration. All data are available on nine-track computer tapes in card-image format upon request to the NASA Langley Technical Library
In-medium kaon and antikaon properties in the quark-meson coupling model
The properties of the kaon, , and antikaon, \kbar, in nuclear medium are
studied in the quark-meson coupling (QMC) model. Employing a constituent
quark-antiquark (MIT bag model) picture, their excitation energies in a nuclear
medium at zero momentum are calculated within mean field approximation. The
scalar, and the vector mesons are assumed to couple directly to the nonstrange
quarks and antiquarks in the and \kbar mesons. It is demonstrated that
the meson induces different mean field potentials for each member of the
isodoublets, and \kbar, when they are embedded in asymmetric nuclear
matter. Furthermore, it is also shown that this meson potential is
repulsive for the meson in matter with a neutron excess, and renders
condensation less likely to occur.Comment: Latex, 11 pages, 4 Postscript figures, a few typos which can be
important for an interpretation (but not reflected in the results) are
corrected, as published in (E) Phys. Lett. B 436 (1998) 45
Cluster-Grouping, Co-Teaching, and Professional Learning Communities Focused on Mathematics Instruction Lead to Improved Engagement and Achievement in Mathematics for Students
Is there Quark Matter in (Low-Mass) Pulsars?
The effect of the QCD phase transition is studied for the mass-radius
relation of compact stars and for hot and dense matter at a given proton
fraction used as input in core-collapse supernova simulations. The phase
transitions to the 2SC and CFL color superconducting phases lead to stable
hybrid star configurations with a pure quark matter core. In supernova
explosions quark matter could be easily produced due to -equilibrium,
small proton fractions and nonvanishing temperatures. A low critical density
for the phase transition to quark matter is compatible with present pulsar mass
measurements.Comment: 4 pages, 3 figures, talk given at the QM2008 conference, Jaipur,
India, February 4-10, 2008, JPG in pres
Fiscal Effects of Minimum Wages – An Analysis for Germany
Against the background of the current discussion on the introduction of statutory minimum wages in Germany, this paper analyzes the potential employment and fiscal effects of such a policy. Based on estimated labor demand elasticities obtained from a structural labor demand model, the empirical results imply that the introduction of minimum wages in Germany will be associated with significant employment losses that are concentrated among marginal and low- and semi-skilled full-time workers. Even though minimum wages will lead to increased public revenues from income taxes and social security benefits, they will result in a significant fiscal burden, due to increased expenditures for unemployment benefits and decreased revenues from corporate taxes.Minimum wages, employment, public budget, fiscal effects
The Convention on Animal Protection: The Missing Link in a One Health Global Strategy for Pandemic Prevention
As the COVID-19 pandemic demonstrates, society’s failure to address animal well-being has had grave consequences not just for animals but also for humans. The emergence of zoonotic diseases is largely a result of high-risk contact with and mistreatment of animals, and it obligates states to assess the risks and mitigate, if not prevent, the underlying harms to animals that ensue. In keeping with the One Health approach, the proposed Convention on Animal Protection for Public Health, Animal Welfare, and the Environment (CAP) lays the groundwork for a comprehensive global strategy to address the missing link in other approaches to the pandemic—specifically by recognizing explicitly that the protection of animal well-being is good for animals, for people, and for the planet.
This Article sets CAP in its historical context, capturing how previous international agreements have been reached to preserve the exploitation of animals as living resources but have not ventured much further than that. The Article looks at how high-risk contact with and mistreatment of animals led to the emergence of COVID-19 and highlights how existing legal frameworks are ill-equipped to prevent similar pandemics. The Article then turns to a discussion of CAP—its origins with the adoption of an American Bar Association (ABA) policy urging the negotiation of a treaty to prevent pandemics by advancing animal protection and welfare, as well as its structure and provisions as framed by its first draft—and distinguishes CAP from other treaty proposals. In conclusion, the Article underscores the opportunity CAP presents not just to help prevent future pandemics but also to advance animals’ intrinsic interests, which are inextricably interwoven with our own
Stability of CFL cores in Hybrid Stars
We study the equation state of strongly interacting quark matter within a
NJL-like model in which the chiral condensates and the color superconducting
gaps are computed self-consistently as a function of the baryon density. A
vector interaction term is added to the Lagrangian in order to render the quark
matter equation of state stiffer. For the low density hadronic phase we use a
relativistic mean field model. The phase transition to quark matter is computed
by a Maxwell construction. We show that stable CFL cores in hybrid stars are
possible if the superconducting gap is sufficiently large. Moreover we find
stable stellar configurations in which two phase transitions occur, a first
transition from hadronic matter to 2SC quark matter and a second transition
from 2SC quark matter to CFL quark matter.Comment: 10 pages, 6 figure
Study of Beta Equilibrated 2+1 Flavor Quark Matter in PNJL Model
We report a first case study of the phase diagram of 2+1 flavor strongly
interacting matter in equilibrium, using the
PolyakovNambuJona-Lasinio model. Physical characteristics of relevant
thermodynamic observables have been discussed. A comparative analysis with the
corresponding observables in the Nambu-Jona-Lasinio model is presented. We find
distinct differences between the models in terms of a number of thermodynamic
quantities like the speed of sound, specific heat, various number densities as
well as entropy. The present study is expected to give us a better insight into
the role that the superdense matter created in heavy ion collision experiments
play in our understanding of the properties of matter inside the core of
supermassive stars in the Universe
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