Wang-Landau sampling in three-dimensional polymers

Monte Carlo simulations using Wang-Landau sampling are performed to study three-dimensional chains of homopolymers on a lattice. We confirm the accuracy of the method by calculating the thermodynamic properties of this system. Our results are in good agreement with those obtained using Metropolis importance sampling. This algorithm enables one to accurately simulate the usually hardly accessible low-temperature regions since it determines the density of states in a single simulation.Comment: 5 pages, 9 figures arch-ive/Brazilian Journal of Physic

Exchange Narrowing Effects in the EPR Linewidth of Gd Diluted in Ce Compounds

Anomalous thermal behavior on the EPR linewidths of Gd impurities diluted in Ce compounds has been observed. In metals, the local magnetic moment EPR linewidth, \Delta H, is expected to increase linearly with the temperature. In contrast, in Ce_{x}La_{1-x}Os_{2} the Gd EPR spectra show a nonlinear increase. In this work, the mechanisms that are responsible for the thermal behavior of the EPR lines in Ce_{x}La_{1-x}Os_{2} are examined. We show that the exchange interaction between the local magnetic moments and the conduction electrons are responsible for the narrowing of the spectra at low temperatures. At high temperatures, the contribution to the linewidth of the exchange interaction between the local magnetic moments and the $Ce$ ions has an exponential dependence on the excitation energy of the intermediate valent ions. A complete fitting of the EPR spectra for powdered samples is obtained.Comment: 11 pages, 1 figur

How can health promotion interventions be adapted for minority ethnic communities? Five principles for guiding the development of behavioural interventions.

The term ‘culturally sensitive’ is often used to describe interventions adapted for minority ethnic communities. However, understanding of strategies for adapting behavioural interventions for such communities is limited. The questions addressed in this paper are: What are the main strategies for adapting interventions to reduce coronary heart disease (CHD) for minority ethnic communities? Why have interventions been adapted in these ways? A systematic review was carried out to investigate interventions for preventing CHD, including promoting physical activity, smoking cessation and healthier diets in Pakistani, Chinese and Indian communities in countries where these groups are minorities. International databases and key websites were searched, and 23 477 titles and abstracts were initially identified. Seventeen papers met inclusion and quality criteria. A ‘meta-ethnographic’ approach to data synthesis was employed to identify underlying principles for adapting interventions. The rationale underpinning adaptations is not made explicit in individual studies, limiting generalizability. Five principles for adapting behavioural interventions for minority ethnic communities were identified: (i) use community resources to publicize the intervention and increase accessibility; (ii) identify and address barriers to access and participation; (iii) develop communication strategies which are sensitive to language use and information requirements; (iv) work with cultural or religious values that either promote or hinder behavioural change; and (v) accommodate varying degrees of cultural identification. While the principles require further testing and verification, they have been generated through a systematic approach to study identification, quality appraisal and data synthesis. This represents significant progress in advancing understanding of adapted behavioural interventions for minority ethnic communities

Efeito da temperatura de condicionamento sobre a digestibilidade da proteina bruta e metabolizabilidade de dietas para frangos de corte.

Sabe-se que o tratamento térmico do alimento pode melhorar seu aproveitamento, sendo a influência do processamento sobre a digestibilidade o principal modo de ação (4). A peletização da ração aumenta a digestibilidade das frações da dieta pela ação mecânica e pela temperatura do processo. Os processos térmicos também promovem alterações das estruturas terciárias naturais das proteínas, facilitando sua digestão (2). A peletização proporciona um aumento do valor energético dos nutrientes, sendo uma alternativa viável para dietas de frangos de corte em termos de aumento da energia metabolizável da dieta. Com isso, objetivou-se avaliar o efeito de diferentes temperaturas de condicionamento sobre o coeficiente de metabolizabilidade aparente da matéria seca (CMAMS) e o coeficiente de digestibilidade aparente da proteína bruta (CDPBap)

Germinação de Cratylia argentea em diferentes graus de maturação.

Edição dos Anais do XVII Congresso Brasileiro de Sementes, Natal, 2011

O futuro do cooperativismo de leite.

bitstream/item/132478/1/Livro-O-futuro-do-cooperativismo.pd

Comportamento de variedades de milheto (Pennisetum glaucum (L.) R. Br.) para produção de massa.

- NETTO, D.A.M