62,008 research outputs found
WHO CHOOSES TO OWN A MANUFACTURED HOME ?
Little research has been conducted on the choice of dwelling by U.S. homeowners. Few studies have included manufactured housing into the dwelling choices available to homeowners. This study focuses on the effects of demographic and socioeconomic variables on a household’s choice to own a manufactured home. A multinomial logit model was used to determine what type of households chooses to own a manufactured home when other traditional dwelling choices are available. I found that income and education play a major role in dwelling choice.Manufactured Housing; Housing Choice; Dwelling Choice, Multinomial Logit
POLITICAL MARKET IMPACTS ON MEXICAN IMPORT PERMITS FOR WHITE CORN
Crop Production/Industries, International Relations/Trade,
Multi-species grandcanonical models for networks with reciprocity
Reciprocity is a second-order correlation that has been recently detected in
all real directed networks and shown to have a crucial effect on the dynamical
processes taking place on them. However, no current theoretical model generates
networks with this nontrivial property. Here we propose a grandcanonical class
of models reproducing the observed patterns of reciprocity by regarding single
and double links as Fermi particles of different `chemical species' governed by
the corresponding chemical potentials. Within this framework we find
interesting special cases such as the extensions of random graphs, the
configuration model and hidden-variable models. Our theoretical predictions are
also in excellent agreement with the empirical results for networks with well
studied reciprocity.Comment: 4 pages, 1 figur
Stellar yields from metal-rich asymptotic giant branch models
We present new theoretical stellar yields and surface abundances for three
grids of metal-rich asymptotic giant branch (AGB) models. Post-processing
nucleosynthesis results are presented for stellar models with initial masses
between 1 and 7.5 for , and 1 and
8 for (solar) and . We include stellar surface
abundances as a function of thermal pulse on the AGB for elements from C to Bi
and for a selection of isotopic ratios for elements up to Fe and Ni (e.g.,
C/C), which can be obtained from observations of molecules in
stars and from the laboratory analysis of meteoritic stardust grains. Ratios of
elemental abundances of He/H, C/O, and N/O are also included, which are useful
for direct comparison to observations of AGB stars and their progeny including
planetary nebulae. The integrated elemental stellar yields are presented for
each model in the grid for hydrogen, helium and all stable elements from C to
Bi. Yields of Li are also included for intermediate-mass models with hot bottom
burning. We present the first neutron-capture (-process) yields for
super-solar metallicity AGB stars with , and the first complete
-process yields for models more massive than 6 at all three
metallicities.Comment: 20 pages, 20 figures, includes supplementary surface abundance and
yield data tables; accepted for publication in Ap
Photovoltaic effect in a gated two-dimensional electron gas in magnetic field
The photovoltaic effect induced by terahertz radiation in a gated
two-dimensional electron gas in magnetic field is considered theoretically. It
is assumed that the incoming radiation creates an ac voltage between the source
and gate and that the gate length is long compared to the damping length of
plasma waves. In the presence of pronounced Shubnikov-de Haas oscillations, an
important source of non-linearity is the oscillating dependence of the mobility
on the ac gate voltage. This results in a photoresponse oscillating as a
function of magnetic field, which is enhanced in the vicinity of the cyclotron
resonance, in accordance with recent experiments. Another, smooth component of
the photovoltage, unrelated to SdH oscillations, has a maximum at cyclotron
resonance.Comment: 4 pages, 3 figure
The hardwiring of development: Organization and function of genomic regulatory systems
The gene regulatory apparatus that directs development is
encoded in the DNA, in the form of organized arrays of
transcription factor target sites. Genes are regulated by
interactions with multiple transcription factors and the
target sites for the transcription factors required for the
control of each gene constitute its cis-regulatory system.
These systems are remarkably complex. Their hardwired
internal organization enables them to behave as genomic
information processing systems. Developmental gene regulatory
networks consist of the cis-regulatory systems of all
the relevant genes and the regulatory linkages amongst
them. Though there is yet little explicit information, some
general properties of genomic regulatory networks have
become apparent. The key to understanding how genomic
regulatory networks are organized, and how they work, lies
in experimental analysis of cis-regulatory systems at all
levels of the regulatory network
Community structure and water quality in Mediterranean streams of a Natural Park (Sant Llorenç del Munt, NE Spain)
Se estudian las comunidades de macroinvertebrados de los ríos del Parque Natural de Sant Llorenç del Munt i la Serra de l'Obac (Barcelona, NE España) y su relación con las condiciones de flujo de los ríos. Hasta 78 localidades se visitaron en dos ocasiones (invierno y verano de 1996) y en 26 de ellas se tomaron muestras de macroinvertebrados. Mientras en invierno el 63 % de los kilÛmetros investigados tenía flujo continuo y menos del 1% estaba seco, en verano solo el 26% tenía flujo continuo, un 20% estaba totalmente seco y el resto presentaba pozas en su lecho. A pesar de ello el número de familias de macroinvertebrados fue de 54 en invierno y 94 en verano, siendo dominantes en este último caso los heterópteros, coleópteros, odonatos y dípteros, mientras que en invierno los tricópteros y plecópteros eran más diversos. En general, la comunidad presentó una estrategia trófica recolectora aunque la proporción de los ramoneadores y depredadores aumentó en verano. El estudio de las comunidades mediante el análisis de su abundancia en los dos perÌodos, mostró que las variables temporales (flujo, temperatura) o las relacionadas con el incremento de la producciÛn primaria (oxÌgeno, pH) explicaban la mayor parte de la variabilidad con los elementos mas reófilos propios de invierno y los leníticos de verano, mientras que otros factores fisicoquímicos no eran relevantes. Calculado el índice biológico BMWP' se demostró que los valores en verano eran superiores o similares a los de invierno lo que se explica por la mayor diversidad aunque la calificaciÛn individual de cada una de las familias encontradas en verano fuera menor que las halladas en invierno
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