3,865 research outputs found
Environmental science applications with Rapid Integrated Mapping and analysis System (RIMS)
The Rapid Integrated Mapping and analysis System (RIMS) has been developed at the University of New Hampshire as an online instrument for multidisciplinary data visualization, analysis and manipulation with a focus on hydrological applications. Recently it was enriched with data and tools to allow more sophisticated analysis of interdisciplinary data. Three different examples of specific scientific applications with RIMS are demonstrated and discussed. Analysis of historical changes in major components of the Eurasian pan-Arctic water budget is based on historical discharge data, gridded observational meteorological fields, and remote sensing data for sea ice area. Express analysis of the extremely hot and dry summer of 2010 across European Russia is performed using a combination of near-real time and historical data to evaluate the intensity and spatial distribution of this event and its socioeconomic impacts. Integrative analysis of hydrological, water management, and population data for Central Asia over the last 30 years provides an assessment of regional water security due to changes in climate, water use and demography. The presented case studies demonstrate the capabilities of RIMS as a powerful instrument for hydrological and coupled human-natural systems research
Development of Distributed Research Center for analysis of regional climatic and environmental changes
We present an approach and first results of a collaborative project being carried out by a joint team of researchers from the Institute of Monitoring of Climatic and Ecological Systems, Russia and Earth Systems Research Center UNH, USA. Its main objective is development of a hardware and software platform prototype of a Distributed Research Center (DRC) for monitoring and projecting of regional climatic and environmental changes in the Northern extratropical areas. The DRC should provide the specialists working in climate related sciences and decision-makers with accurate and detailed climatic characteristics for the selected area and reliable and affordable tools for their in-depth statistical analysis and studies of the effects of climate change. Within the framework of the project, new approaches to cloud processing and analysis of large geospatial datasets (big geospatial data) inherent to climate change studies are developed and deployed on technical platforms of both institutions. We discuss here the state of the art in this domain, describe web based information-computational systems developed by the partners, justify the methods chosen to reach the project goal, and briefly list the results obtained so far
Higher and missing resonances in omega photoproduction
We study the role of the nucleon resonances () in
photoproduction by using the quark model resonance parameters predicted by
Capstick and Roberts. The employed and
amplitudes include the configuration mixing effects due to the residual
quark-quark interactions. The contributions from the nucleon resonances are
found to be important in the differential cross sections at large scattering
angles and various spin observables. In particular, the parity asymmetry and
beam-target double asymmetry at forward scattering angles are suggested for a
crucial test of our predictions. The dominant contributions are found to be
from , a missing resonance, and which is
identified as the of the Particle Data Group.Comment: 8 pages, LaTeX with ws-p8-50x6-00.cls, 4 figures (5 eps files), Talk
presented at the NSTAR2001 Workshop on the Physics of Excited Nucleons,
Mainz, Germany, Mar. 7-10, 200
Electromagnetic production of vector mesons at low energies
We have investigated exclusive photoproduction of light vector mesons
(, and ) on the nucleon at low energies. In order to
explore the questions concerning the so-called missing nucleon resonances, we
first establish the predictions from a model based on the Pomeron and meson
exchange mechanisms. We have also explored the contributions due to the
mechanisms involving - and -channel intermediate nucleon state. Some
discrepancies found at the energies near threshold and large scattering angles
suggest a possibility of using this reaction to identify the nucleon
resonances.Comment: 9 pages, LaTeX with sprocl.sty, 5 figures (11 eps files), Talk
presented at the NSTAR2000 Workshop, The Physics of Excited Nucleons,
Jefferson Lab., Newport News, Feb. 16-19, 200
Probing nucleon strangeness in phi electroproduction
We investigate meson electroproduction to probe the hidden strangeness
content of the nucleon. We found that even a small amount of the
admixture in the nucleon wavefunction can lead to a significant change in
several double polarization asymmetries in electroproduction, which can
be tested experimentally at current electron facilities.Comment: 3 pages, 1 figure (2 eps files), LaTeX2e with espcrc1.sty, Talk at
the XVI International Conference on Few-Body Problems in Physics (FB16),
Taipei, Taiwan, March 6-10, 200
Non-linear Breit-Wheeler process with linearly polarized beams
We study the non-linear Breit-Wheeler process in the interaction of linearly polarized probe photons ()
with a linearly polarized laser beam (). In particular, we consider the
asymmetry of the total cross section and the azimuthal electron distributions
when the polarizations of the photon and laser beams in the initial state are
mutually perpendicular or parallel. Considering intense laser beams and the
strong field asymptotic we explore essentially the multi-photon dynamics. The
asymmetry exhibits some non-monotonic behavior depending on initial kinematic
conditions; it depends sensitively on the laser pulse duration. Our results
provide additional knowledge for studying non-linear multi-photon effects in
quantum electrodynamics and may be used in planning experiments in upcoming
laser facilities.Comment: 9 pages, 8 figure
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