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Search Results: 1 - 10 of 1746 matches for " Jeff Gentry "
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Discussion of "Estimating the historical and future probabilities of large terrorist events" by Aaron Clauset and Ryan Woodard
Gentry White
Statistics , 2014, DOI: 10.1214/13-AOAS614C
Abstract: Discussion of "Estimating the historical and future probabilities of large terrorist events" by Aaron Clauset and Ryan Woodard [arXiv:1209.0089].
SWAT and Wavelet Analysis for Understanding the Climate Change Impact on Hydrologic Response  [PDF]
Shesh Raj Koirala, Randall W. Gentry
Open Journal of Modern Hydrology (OJMH) , 2012, DOI: 10.4236/ojmh.2012.22006
Abstract: Quantifying the hydrological response to an increased atmospheric carbon dioxide concentration and climate change is important in a watershed scale particularly from the application point of view. The specific objectives are to evaluate the climate change impact on the future water yield at the outlet of Clinch River Watershed upstream of Norris Lake in Tennessee, USA and see how the frequency of extreme water yield (e.g. flood) changes compared to present condition. The predicted future climate change by climate change scenarios A2 from community climate system model (CCSM) is applied. The model was calibrated using monthly average streamflow data from 1970 to 1989 and validated using similar data from 1990 to 2009 collected at a USGS gauging station 03528000. Changes in monthly average streamflow were estimated for long term (around 2099). Results were also interpreted in the time-frequency domain approach by showing how frequency of occurrence changes based on A2 scenario.
The Genuine Cosmic Rosetta
Robert V. Gentry,David W. Gentry
Physics , 1998,
Abstract: Reexamination of general relativistic experimental results shows the universe is governed by Einstein's static-spacetime general relativity instead of Friedmann-Lemaitre expanding-spacetime general relativity. The absence of expansion redshifts in a static-spacetime universe suggests a reevaluation of the present cosmology is needed.
An 11bp Region with Stem Formation Potential Is Essential for de novo DNA Methylation of the RPS Element
Matthew Gentry, Peter Meyer
PLOS ONE , 2013, DOI: 10.1371/journal.pone.0063652
Abstract: The initiation of DNA methylation in Arabidopsis is controlled by the RNA-directed DNA methylation (RdDM) pathway that uses 24nt siRNAs to recruit de novo methyltransferase DRM2 to the target site. We previously described the REPETITIVE PETUNIA SEQUENCE (RPS) fragment that acts as a hot spot for de novo methylation, for which it requires the cooperative activity of all three methyltransferases MET1, CMT3 and DRM2, but not the RdDM pathway. RPS contains two identical 11nt elements in inverted orientation, interrupted by a 18nt spacer, which resembles the features of a stemloop structure. The analysis of deletion/substitution derivatives of this region showed that deletion of one 11nt element RPS is sufficient to eliminate de novo methylation of RPS. In addition, deletion of a 10nt region directly adjacent to one of the 11nt elements, significantly reduced de novo methylation. When both 11nt regions were replaced by two 11nt elements with altered DNA sequence but unchanged inverted repeat homology, DNA methylation was not affected, indicating that de novo methylation was not targeted to a specific DNA sequence element. These data suggest that de novo DNA methylation is attracted by a secondary structure to which the two 11nt elements contribute, and that the adjacent 10nt region influences the stability of this structure. This resembles the recognition of structural features by DNA methyltransferases in animals and suggests that similar mechanisms exist in plants.
The New Redshift Interpretation Affirmed
Robert V. Gentry
Physics , 1998,
Abstract: In late 1997 I reported (Mod. Phys. Lett. A 12 (1997) 2919; astro-ph/9806280) the discovery of A New Redshift Interpretation (NRI) of the Hubble relation and the 2.7K CBR, which showed for the first time that it was possible to explain these phenomena within the framework of a universe governed by Einstein's static-spacetime general relativity (GR) instead of the Friedmann-Lemaitre expanding-spacetime paradigm. More recently Carlip and Scranton (astro-ph/9808021; C&S) claim to find flaws in this discovery, while also claiming the standard cosmology is error free. Their analysis assumes the NRI represents a static cosmological model of the universe. This is wrong. My MPLA report clearly states the NRI encompasses an expanding universe wherein galaxies are undergoing Doppler recession due to vacuum density repulsion. C&S's confusion on this crucial point leads to serious errors in their analysis. Next, in claiming the standard cosmology is error free, C&S fail to respond to the contradictory evidence in my preprint, gr-qc/9806061. There I first show why the universe is governed by Einstein static-spacetime GR, and not the Friedmann-Lemaitre expanding spacetime paradigm on which Big Bang cosmology is critically hinged. Secondly, I note a most embarrassing fact about the F-L paradigm--namely, that it has always involved gargantuan nonconservation-of-energy losses amounting to the mass equivalent of about thirty million universes, each with a mass of 10^21 suns.
Optical Detection and Analysis of Pictor A's Jet
Eric S. Gentry
Physics , 2014,
Abstract: New images from the Hubble Space Telescope of the FRII radio galaxy Pictor A reveal a number of jet knot candidates which coincide with previously detected radio and x-ray knots. Previous observations in x-ray and radio bands show the entire jet to be 1.9' long, with interesting variability, but an optical component was previously unknown. The discovered optical component is faint, and knot candidates must be teased out from a bright host galaxy. Using three broadband filters, we extract knot fluxes and upper-bounds on the flux for multiple knot candidates at wavelengths of 1600nm, 814nm and 475nm. We find that the data suggest that localized particle re-accleration events followed by synchrotron emission could explain the observed knot candidates, but those electrons could not supply enough x-ray flux to match prior observations. Our data provide key evidence suggesting a second, higher energy electron population which was previously hypothesized, but could not be confirmed.
A New Redshift Interpretation
Robert V. Gentry
Physics , 1998, DOI: 10.1142/S0217732397003034
Abstract: A nonhomogeneous universe with vacuum energy, but without spacetime expansion, is utilized together with gravitational and Doppler redshifts as the basis for proposing a new interpretation of the Hubble relation and the 2.7K Cosmic Blackbody Radiation.
Maser Radiation in an Astrophysical Context (Overview)
Eric S. Gentry
Physics , 2013,
Abstract: In this paper we will look at the phenomenon of Microwave Amplification by Stimulated Emission of Radiation (a maser system). We begin by deriving amplification by stimulated emission using time-dependent perturbation theory, in which the perturbation provided by external radiation. When this perturbation is applied to an ensemble of particles exhibiting a population inversion, the result is stimulated microwave radiation. We will explore both unsaturated and saturated masers and compare their properties. By understanding their gain, as well as the effect of line broadening, astronomers are to identify astrophysical masers. By studying such masers, we gain new insight into poorly understood physical environments, particularly those around young and old stars, and compact stellar bodies.
The augmented marking complex of a surface
Matthew Gentry Durham
Mathematics , 2013,
Abstract: We build an augmentation of the Masur-Minsky marking complex by Groves-Manning combinatorial horoballs to obtain a graph we call the augmented marking complex, $\mathcal{AM}(S)$. Adapting work of Masur-Minsky, we prove that $\mathcal{AM}(S)$ is quasiisometric to Teichm\"uller space with the Teichm\"uller metric. A similar construction was independently discovered by Eskin-Masur-Rafi. We also completely integrate the Masur-Minsky hierarchy machinery to $\mathcal{AM}(S)$ to build flexible families of uniform quasigeodesics in Teichm\"uller space. As an application, we give a new proof of Rafi's distance formula for the Teichm\"uller metric.
The asymptotic geometry of the Teichmüller metric: Dimension and rank
Matthew Gentry Durham
Mathematics , 2014,
Abstract: We analyze the asymptotic cones of Teichm\"uller space with the Teichm\"uller metric, $(\mathcal{T}(S),d_T)$. We give a new proof of a theorem of Eskin-Masur-Rafi which bounds the dimension of quasiisometrically embedded flats in $(\mathcal{T}(S),d_T)$. Our approach is an application of the ideas of Behrstock and Behrstock-Minsky to the quasiisometry model we previously built for $(\mathcal{T}(S),d_T)$.
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