1,762 research outputs found
The Emergence of Rural Artistic Havens: A First Look
Nearly all applied research on arts activity has examined phenomena in metropolitan areas. Findings from this past research confirm an arts specialization in a limited number of cities. This paper finds a similar pattern in nonmetropolitan areas, where a limited number of counties maintain or develop a distinct specialization in the arts. We document the emergence of these "rural artistic havens" and identify county characteristics associated with the attraction of performing, fine, and applied artists. The implications of these findings for rural development strategies focusing on the arts are discussed.arts activity, built amenities, creative class, logistic regression, natural amenities, tourism development, Community/Rural/Urban Development,
Ethanol Plant Location Determinants and County Comparative Advantage
The location of ethanol plants is determined by infrastructure, product and input markets, fiscal attributes of local communities, and state and federal incentives. This empirical analysis uses probit regression along with spatial clustering methods to analyze investment activity of ethanol plants at the county level for the lower U.S. 48 states from 2000 to 2007. The availability of feedstock dominates the site selection decision. Other factors, such as access to navigable rivers or railroads, product markets, producer credit and excise tax exemptions, and methyl tertiary-butyl ether bans provided some counties with a comparative advantage in attracting ethanol plants.cluster analysis, comparative advantage, ethanol production, location model, Community/Rural/Urban Development, Environmental Economics and Policy, Political Economy, R1, R3,
VLBA Imaging of NGC 4261: Symmetric Parsec-scale Jets and the Inner Accretion Region
We observed the nuclear region of NGC 4261 (3C270) with the VLBA at two
frequencies (1.6 and 8.4 GHz) simultaneously. We find that the position angle
of the parsec-scale radio axis agrees, within the errors, with the position
angle of the VLA-scale jet. Our observations also reveal basically symmetric
radio structures at both 1.6 and 8.4 GHz. Analysis of these images shows that
most of the central 10 pc of this source is not significantly affected by
free-free absorption, even though HST images show that the nucleus contains a
nearly edge-on disk of gas and dust on larger scales. Our highest angular
resolution image shows a very narrow gap in emission, which we interpret as an
absorption feature, just east of the radio core. This suggests that there may
be a small, dense inner accretion disk whose width is less than 0.1 pc. If the
inclination of this inner disk is close to that of the larger-scale HST disk it
becomes optically thin to 8.4 GHz radiation at a deprojected radius of about
0.8 pc. The brightness of the pc-scale jets falls off very rapidly on both
sides of the core, suggesting that the jets are rapidly expanding during the
the first several pc of their travel. It appears that there is a small dense
inner disk centered on the radio core (the base of the jets; less than 1 pc), a
low density bubble filling most of the the inner several pc of the nucleus
(within which the radio jets expand rapidly; ~10 pc), and a surrounding cool,
higher density region (of which the HST absorption disk is part; tens to
hundreds of pc) within which the transverse expansion of the radio jets, as
implied by the rate of decrease in jet brightness, is nearly halted.Comment: Accepted by the Astrophysical Journa
Preliminary Canopy Removal Experiments in Algal Dominated Communities Low on the Shore and in the Shallow Subtidal on the Isle of Man
The algal dominated communities immediately above and below the low-water spring level on a moderately exposed Manx shore were investigated by canopy removal experiments. Fucus serratus, Laminaria digitata and L. hyperborea were removed. Competition was shown to be important in determining the zonation of L. digitata and the distribution along the wave exposure gradient of other species such as Alaria esculenta, Desmarestia aculeata and D. viridis, and L. saccharina. Many species of algal epiphytes were early colonizers of canopy removal areas suggesting that competition from canopy algae usually restricts them to an epiphytic habit. The results indicate that interactions between macrophytes are much more important than grazing in structuring these communities
Speciation and Mobilization of Toxic Heavy Metal Ions by Methanogenic Bacteria
HWRIC Project HWR 92-09
1/t pressure and fermion behaviour of water in two dimensions
A variety of metal vacuum systems display the celebrated 1/t pressure, namely
power-law dependence on time t, with the exponent close to unity, the origin of
which has been a long-standing controversy. Here we propose a chemisorption
model for water adsorbates, based on the argument for fermion behaviour of
water vapour adsorbed on a stainless-steel surface, and obtain analytically the
power-law behaviour of pressure, with an exponent of unity. Further, the model
predicts that the pressure should depend on the temperature T according to
T^(3/2), which is indeed confirmed by our experiment. Our results should help
elucidate the unique characteristics of the adsorbed water.Comment: 11 pages, 4 figure
Factors Influencing Selection of Information Sources by Cotton Producers Considering Adoption of Precision Agriculture Technologies
Acknowledgements: The authors thank Cotton Incorporated and the Tennessee Agricultural Experiment Station for financial supportInformation source use decisions, Precision Agriculture Technologies, Extension, Media, Private sources, Multivariate Probit, Teaching/Communication/Extension/Profession, Q12, Q16,
Factors Influencing the Selection of Precision Farming Information Sources by Cotton Producers
Precision farming information demanded by cotton producers is provided by various suppliers, including consultants, farm input dealerships, University Extension systems, and media sources. Factors associated with the decisions to select among information sources to search for precision farming information are analyzed using a multivariate probit regression accounting for correlation among the different selection decisions. Factors influencing these decisions are age, education, and income. These findings should be valuable to precision farming information providers who may be able to better meet their target clientele needs.Extension, information-source-use decisions, media, multivariate probit, precision agriculture technologies, private sources, Farm Management, Teaching/Communication/Extension/Profession,
Investigation of transition frequencies of two acoustically coupled bubbles using a direct numerical simulation technique
The theoretical results regarding the ``transition frequencies'' of two
acoustically interacting bubbles have been verified numerically. The theory
provided by Ida [Phys. Lett. A 297 (2002) 210] predicted the existence of three
transition frequencies per bubble, each of which has the phase difference of
between a bubble's pulsation and the external sound field, while
previous theories predicted only two natural frequencies which cause such phase
shifts. Namely, two of the three transition frequencies correspond to the
natural frequencies, while the remaining does not. In a subsequent paper [M.
Ida, Phys. Rev. E 67 (2003) 056617], it was shown theoretically that transition
frequencies other than the natural frequencies may cause the sign reversal of
the secondary Bjerknes force acting between pulsating bubbles. In the present
study, we employ a direct numerical simulation technique that uses the
compressible Navier-Stokes equations with a surface-tension term as the
governing equations to investigate the transition frequencies of two coupled
bubbles by observing their pulsation amplitudes and directions of translational
motion, both of which change as the driving frequency changes. The numerical
results reproduce the recent theoretical predictions, validating the existence
of the transition frequencies not corresponding to the natural frequency.Comment: 18 pages, 8 figures, in pres
Factors Influencing Cotton Farmersâ Perceptions about the Importance of Information Sources in Precision Farming Decisions
Information generated by precision farming technologies is of particular importance to producers. Precision farming technologies implies the ability to improve the management of production factors using site-specific information. This study examines factors influencing cotton farmersâ perceptions about the importance of crop consultants, farm input dealerships, Extension, other farmers, trade shows, the Internet and printed news/media for making precision farming decisions using a rank ordered logit model (ROLM). Results suggest that age, land tenure, income, percentage of income from farming, and location may affect farmersâ perceptions about the importance of different information sources when making decisions about precision farming technologies. Results suggest that regardless of farmer/farm business characteristics other farmers (OF) is one of the most important information sources when making precision farming decisions. Findings suggest that high income producers are more likely to prefer crop consultants, University/Extension, trade shows, and the Internet over OF as a source of information when making decisions about precision farming technologies. Findings also suggest that researchers need to be very careful when designing questions that ask respondents to rank alternatives so that they guarantee that individuals with different skills are able to precisely understand what is being asked. Decreasing the number of alternatives respondents must consider may be one strategy to reduce the complexity of ranking questions to minimize the probability of the respondents leaving alternatives unranked or ranking them randomly.Information-source preferences, Rank Ordered Logit Model, Precision Farming, Production Economics, Research Methods/ Statistical Methods, Q16, C25,
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