18,140 research outputs found
Shrub line advance in alpine tundra of the Kluane region: Mechanisms of expansion and ecosystem impacts
Shrub Line Advance in Alpine Tundra of the Kluane Region: Mechanisms of Expansion and Ecosystem Impacts
Space station automation of common module power management and distribution, volume 2
The new Space Station Module Power Management and Distribution System (SSM/PMAD) testbed automation system is described. The subjects discussed include testbed 120 volt dc star bus configuration and operation, SSM/PMAD automation system architecture, fault recovery and management expert system (FRAMES) rules english representation, the SSM/PMAD user interface, and the SSM/PMAD future direction. Several appendices are presented and include the following: SSM/PMAD interface user manual version 1.0, SSM/PMAD lowest level processor (LLP) reference, SSM/PMAD technical reference version 1.0, SSM/PMAD LLP visual control logic representation's (VCLR's), SSM/PMAD LLP/FRAMES interface control document (ICD) , and SSM/PMAD LLP switchgear interface controller (SIC) ICD
Carbon exchange and permafrost collapse: implications for a changing climate
Thesis (M.S.) University of Alaska Fairbanks, 2005With a warmer climate, the wetlands of Interior Alaska may experience more frequent or extensive stand-replacing fires and permafrost degradation. This, in turn may change the primary factors controlling carbon emissions. I measured carbon exchange along a moisture transect from the center of a sphagnum-dominated bog into a burned forest (2001 Survey Line Fire) on the Tanana River Floodplain. Both the bog and the surrounding burn were sinks for CO₂, and the bog was a CH₄ source in the abnormally dry summer of 2004. Thermokarst and subsiding soils were observed on the margin of the bog in the three years since the fire, increasing the anaerobic portion of the soil landscape. I observed the greatest variation in carbon fluxes in this portion of the transect. I conclude that permafrost collapse is altering the pattern of emissions from this landscape. I tracked historical changes in vegetation, hydrology and fire at this site through macrofossil, charcoal and diatom analysis of peat cores. The paleoecological record suggests that fire mediates permafrost collapse in this system. This study indicates that future changes in temperature and precipitation will alter carbon cycling and vegetation patterns across this boreal landscape
Dispersion-induced generation of higher order transversal modes in singly-resonant optical parametric oscillators
We study the effects of higher order transversal modes in a model of a
singly-resonant OPO, using both numerical solutions and mode expansions
including up to two radial modes. The numerical and two-mode solutions predict
lower threshold and higher conversion than the single-mode solution at negative
dispersion. Relative power in the zero order radial mode ranges from about 88%
at positive and small negative dispersion to 48% at larger negative dispersion,
with most of the higher mode content in the first mode, and less than 2% in
higher modes.Comment: 13 pages, 4 figures, PACS Numbers: 42.65.Ky, 42.10.Qj, Key Words:
parametric oscillation, phase-matching, diffractio
AGN pairs: chance superpositions or black hole binaries?
Several active galactic nuclei (AGN) with multiple sets of emission lines
separated by over 2000 km/s have been observed recently. These have been
interpreted as being due to massive black hole (MBH) recoil following a black
hole merger, MBH binaries, or chance superpositions of AGN in galaxy clusters.
Moreover, a number of double-peaked AGN with velocity offsets of ~ a few 100
km/s have also been detected and interpreted as being due to the internal
kinematics of the narrow line regions or MBH binary systems. Here we reexamine
the superposition model. Using the Millennium Run we estimate the total number
of detectable AGN pairs as a function of the emission line offset. We show that
AGN pairs with high velocity line separations up to ~2000 km/s are very likely
to be chance superpositions of two AGN in clusters of galaxies for reasonable
assumptions about the relative fraction of AGN. No superimposed AGN pairs are
predicted for velocity offsets in excess of ~3000 km/s as the required AGN
fractions would violate observational constraints. The high velocity AGN pair
numbers predicted here are competitive with those predicted from the models
relying on MBH recoil or MBH binaries. However, the model fails to account for
the largest emission line velocity offsets that require the presence of MBH
binaries.Comment: 4 pages, 2 figures, submitted to ApJ Letter
Trivial Spectrum of Free 1+1 Light-Cone Strings
The BRST cohomology of 1+1 strings in a free light-cone gauge contains only
the two-dimensional tachyon, and excludes all excited states of both matter and
ghosts, including the special states that arise in the continuum conformal
gauge quantization and in the matrix models. This exclusion takes place
at a very basic level, and therefore may signal some serious problems or at
least unresolved issues involved in this gauge choice.Comment: 9 pages, UTTG 17-9
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