4,954 research outputs found
A classified list of practical mathematical problems for grades 9-12.
Thesis (M.A.)--Boston Universit
RURAL COMMUNITIES IN AN INDUSTRIALIZED AGRICULTURE
Community/Rural/Urban Development,
Viscoplastic constitutive models for zero-thickness interface elements, formulation and applications
An energy-based work-softening visco-plastic model for zero-thickness interface elements has been developed as an extension of an existing elastic-perfectly-viscoplastic formulation. In the inviscid limit the model also collapses into a well-established fracture mechanics-based elasto-plastic model. The new model is verified satisfactorily for common loading cases at interfaces such as pure tension (mode I) opening, and shear-compression (mixed-mode) sliding, with results that in the long term match the predictions of the fracture mechanics inviscid model.Postprint (published version
Viscoplastic constitutive models for zero-thickness interface elements, formulation and applications
An energy-based work-softening visco-plastic model for zero-thickness interface elements has been developed as an extension of an existing elastic-perfectly-viscoplastic formulation. In the inviscid limit the model also collapses into a well-established fracture mechanics-based elasto-plastic model. The new model is verified satisfactorily for common loading cases at interfaces such as pure tension (mode I) opening, and shear-compression (mixed-mode) sliding, with results that in the long term match the predictions of the fracture mechanics inviscid model
Sharp Bounds on the Entropy of the Poisson Law and Related Quantities
One of the difficulties in calculating the capacity of certain Poisson
channels is that H(lambda), the entropy of the Poisson distribution with mean
lambda, is not available in a simple form. In this work we derive upper and
lower bounds for H(lambda) that are asymptotically tight and easy to compute.
The derivation of such bounds involves only simple probabilistic and analytic
tools. This complements the asymptotic expansions of Knessl (1998), Jacquet and
Szpankowski (1999), and Flajolet (1999). The same method yields tight bounds on
the relative entropy D(n, p) between a binomial and a Poisson, thus refining
the work of Harremoes and Ruzankin (2004). Bounds on the entropy of the
binomial also follow easily.Comment: To appear, IEEE Trans. Inform. Theor
Estudio experimental del Sistema de AlbañilerĂa Integral en la construcciĂłn de viviendas sismorresistentes. Experimental study of the Integral Masonry System in the construction of earthquake resistant houses
This paper presents the application of the Integral
Masonry System (IMS) to the construction of earthquake
resistant houses and its experimental study. To verify the
security of this new type of building in seismic areas of
the third world two prototypes have been tested, one
with adobe and the other with hollow brick. In both
cases itâs a two-story 6x6x6 m3 house built to scale 1/2.
The tests are carried out at the Laboratory of Antiseismic
Structures of the Department of Engineering,
Pontifical Catholic University of Peru in Lima, in
collaboration with the UPM (Technical University of
Madrid).
This article shows the design process of the prototypes to
test, including the sizing of the reinforcements, the
characteristics of the tests and the results obtained. These
results show that the IMS with adobe or brick remains
stable with no significant cracks faced with a severe
earthquake, with an estimated acceleration of 1.8 g.
Este artĂculo presenta una aplicaciĂłn del Sistema de
AlbañilerĂa Integral (SAI) a la construcciĂłn de viviendas
sismorresistentes y su estudio experimental. Para verificar
su seguridad para su construcciĂłn en zonas sĂsmicas
del tercer mundo se han ensayado dos prototipos, uno
con adobe, y otro con ladrillo hueco. Se trata de una
vivienda de 6x6x6 m3 y dos plantas que se construyen a
escala 1/2. Los ensayos se realizaron en el Laboratorio
de Estructuras AntisĂsmicas del Departamento de IngenierĂa
de la Pontificia CatĂłlica Universidad del PerĂș (PUCP)
de Lima en colaboración con la UPM (Universidad Politécnica
de Madrid).
Este artĂculo muestra el proceso de diseño de los prototipos
a ensayar, incluido el dimensionado de los refuerzos,
las caracterĂsticas de los ensayos y los resultados
obtenidos. Estos resultados muestran que el SAI con
adobe o ladrillo permanece estable sin grietas significativas ante un sismo severo, con una aceleraciĂłn estimada
de 1,8 g
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