9,955 research outputs found
The Gamow-Teller Resonance in Finite Nuclei in the Relativistic Random Phase Approximation
Gamow-Teller(GT) resonances in finite nuclei are studied in a fully
consistent relativistic random phase approximation (RPA) framework. A
relativistic form of the Landau-Migdal contact interaction in the spin-isospin
channel is adopted. This choice ensures that the GT excitation energy in
nuclear matter is correctly reproduced in the non-relativistic limit. The GT
response functions of doubly magic nuclei Ca, Zr and Pb
are calculated using the parameter set NL3 and =0.6 . It is found that
effects related to Dirac sea states account for a reduction of 6-7 % in the GT
sum rule.Comment: 9 pages, 1 figur
Lost and found : resilience approaches that helped the Vietnamese residents of Biloxi, Mississippi in the aftermath of Hurricane Katrina
Vietnamese American residents of Biloxi, Mississippi were impacted heavily by Hurricane Katrina; many are still recovering from the losses caused by the storm. Stories in the news media and academia have discussed the strengths and resilience in the Vietnamese communities post Hurricane Katrina. However, no authors discuss in detail the resilience factors that helped the survivors. The purpose of this study is to use post-Hurricane Katrina as an exemplar to understand the experience of the Vietnamese community in Biloxi, Mississippi. The researcher intended to explore the protective factors that survivors use to help rebuild their lives. The study used existing data from the research project that I participated in and examined literature on the experiences of the Vietnamese Americans to assist in identifying the protective factors. Theories of resilience included individual, family and community and are explored to understand the sources of these protective factors. This study found that the resilience theories mentioned in this paper help to understand the resilience experiences of Vietnamese American survivors of Hurricane Katrina. Resilience assessment (LINC) utilizes the mapping process to evaluate the individuals\u27, families\u27 and communities\u27 strengths. This researcher found that focusing on strength capacities builds culture-appropriate and effective intervention when working with the Vietnamese American hurricane survivors
New Technology, Human Capital and Growth in a Developing Country
In a developing country with three sectors: consumption goods, new tech- nology, and education, the productivity of the consumption goods depends on a new technology and skilled labor used to produce this new technology. There can be three stages of economic growth. In the Â…rst stage the country concentrates on the production of consumption goods; in the second the country must import both physical capital and new technology capital to produce consumption goods and new technology; in the third the country must import capital and invest in the training and education of high skilled labor.Optimal growth model; New technology capital;Human Capital; Developing country
New Technology, Human Capital and Growth for European Transitional Economies.
We consider a transitional country with three sectors in economy: con- sumption goods, new technology, and education. Productivity of the con- sumption goods sector depends on new technology and skilled labor used for production of the new technology. Then there might be three stages of economic growth. In the first stage the country concentrates on produc- tion of consumption goods; in the second stage the country imports both physical capital and new technology capital; in the last stage the country imports new technology capital and invests in training and education of high skilled labor in the same time.Optimal growth model, New technology capital, Human Capital, Developing country.
Joint Deep Modeling of Users and Items Using Reviews for Recommendation
A large amount of information exists in reviews written by users. This source
of information has been ignored by most of the current recommender systems
while it can potentially alleviate the sparsity problem and improve the quality
of recommendations. In this paper, we present a deep model to learn item
properties and user behaviors jointly from review text. The proposed model,
named Deep Cooperative Neural Networks (DeepCoNN), consists of two parallel
neural networks coupled in the last layers. One of the networks focuses on
learning user behaviors exploiting reviews written by the user, and the other
one learns item properties from the reviews written for the item. A shared
layer is introduced on the top to couple these two networks together. The
shared layer enables latent factors learned for users and items to interact
with each other in a manner similar to factorization machine techniques.
Experimental results demonstrate that DeepCoNN significantly outperforms all
baseline recommender systems on a variety of datasets.Comment: WSDM 201
Motion in a rocked ratchet with spatially periodic friction
We present a detailed study of the transport and energetics of a Brownian
particle moving in a periodic potential in the presence of an adiabatic
external periodic drive. The particle is considered to move in a medium with
periodic space dependent friction with the same periodicity as that of the
potential but with a phase lag. We obtain several results, most of them arising
due to the medium being inhomogeneous and are sensitive to the phase lag. When
the potential is symmetric we show that efficiency of energy transduction can
be maximised as a function of noise strength or temperature. However, in the
case of asymmtertic potential the temperature may or may not facilitate the
energy conversion but current reversals can be obtained as a function of
temperature and the amplitude of the periodic drive. The reentrant behaviour of
current can also be seen as a function of phase lag
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