647 research outputs found
Excited states of beryllium atom from explicitly correlated wave functions
A study of the first excited states of beryllium atom starting from
explicitly correlated wave functions is carried out. Several properties are
obtained and discussed focusing on the analysis of the Hund's rules in terms of
the single--particle and electron pair intracule and extracule densities. A
systematic study of the differences on the electronic distributions of the
singlet and triplet states is carried out. The trial wave function used to
describe the different bound states consists of a generalized Jastrow-type
correlation factor times a configuration interaction model wave function. This
model wave function has been fixed by using a generalization of the optimized
effective potential method to deal with multiconfiguration wave functions. The
optimization of the wave function and the calculation of the different
quantities is carried out by means of the Variational Monte Carlo method.Comment: 28 pages, 6 figure
Ferrimagnetism and compensation points in a decorated 3D Ising models
We give a precise numerical solution for decorated Ising models on the simple
cubic lattice which show ferromagnetism, compensation points, and reentrant
behaviour. The models, consisting of spins on a simple cubic
lattice, and decorating S=1 or spins on the bonds, can be mapped
exactly onto the normal spin-1/2 Ising model, whose properties are well known.Comment: 8 pages, 5 figure
Monte Carlo Study of Mixed-Spin S=(1/2,1) Ising Ferrimagnets
We investigate Ising ferrimagnets on square and simple-cubic lattices with
exchange couplings between spins of values S=1/2 and S=1 on neighbouring sites
and an additional single-site anisotropy term on the S=1 sites. Based mainly on
a careful and comprehensive Monte Carlo study, we conclude that there is no
tricritical point in the two--dimensional case, in contradiction to mean-field
predictions and recent series results. However, evidence for a tricritical
point is found in the three-dimensional case. In addition, a line of
compensation points is found for the simple-cubic, but not for the square
lattice.Comment: 14 pages, 11 figure
Long-term yogurt consumption and risk of incident hypertension in adults
The Nurses' Health Study and Health Professionals Follow-up Study cohorts are supported by grants UM1 CA186107, UM1 CA176726, and UM1 CA167552 from the National Institutes of Health. The current analyses were supported by small grants from the National Dairy Council, the General Mills Bell Institute for Health and Nutrition, and the Boston Nutrition and Obesity Research Center. The Boston Nutrition Obesity Research Center is administratively based at Boston Medical Center and is funded by the National Institutes of Health (NIH/NIDDK) grant P30DK046200. (UM1 CA186107 - National Institutes of Health; UM1 CA176726 - National Institutes of Health; UM1 CA167552 - National Institutes of Health; small grants from the National Dairy Council; General Mills Bell Institute for Health and Nutrition; Boston Nutrition and Obesity Research Center; P30DK046200 - National Institutes of Health (NIH/NIDDK))Accepted manuscrip
Strategic supplier performance in a competitive landscape: Enhancing organizational performance through lean supply chain management
In a context characterized by increasing competitive pressure, supply chain collaboration has gained greater relevance and lean principles have been integrated into supply chain management to address the challenge of achieving better organizational performance. The purpose of this study is to understand the roles of strategic supplier performance and competitive intensity in Lean Supply Chain Management (LSCM) implementation and its performance. We use a variance-based Structural Equation Model analysis with empirical data from a sample of 273 Spanish companies to analyze the relationships among strategic suppliers, competitive intensity, LSCM implementation, and performance. Our findings indicate that strategic supplier performance is positively associated with LSCM implementation and that this relationship is heightened in highly competitive industries. Our results also reveal the indirect association of LSCM implementation in the strategic supplier performance-organizational performance relationship. JEL CLASSIFICATION: M11
Phase Angle Calculation Dynamics of Type 4 Wind Turbines in RMS Simulations during Severe Voltage Dips.
Epoca de plantio para o algodoeiro herbaceo (Gossipium hirsutum L.) nas principais regioes produtoras do Estado de Minas Gerais.
bitstream/item/33351/1/EPOCA-DE-PLANTIO-PARA-O-ALGODOEIRO.pd
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