Application of the S=1 underscreened Anderson lattice model to Kondo uranium and neptunium compounds

Magnetic properties of uranium and neptunium compounds showing the coexistence of Kondo screening effect and ferromagnetic order are investigated within the Anderson lattice Hamiltonian with a two-fold degenerate $f$-level in each site, corresponding to $5f^2$ electronic configuration with $S=1$ spins. A derivation of the Schrieffer-Wolff transformation is presented and the resulting Hamiltonian has an effective $f$-band term, in addition to the regular exchange Kondo interaction between the $S=1$ $f$-spins and the $s=1/2$ spins of the conduction electrons. The obtained effective Kondo lattice model can describe both the Kondo regime and a weak delocalization of $5f$-electron. Within this model we compute the Kondo and Curie temperatures as a function of model parameters, namely the Kondo exchange interaction constant $J_K$, the magnetic intersite exchange interaction $J_H$ and the effective $f$-bandwidth. We deduce, therefore, a phase diagram of the model which yields the coexistence of Kondo effect and ferromagnetic ordering and also accounts for the pressure dependence of the Curie temperature of uranium compounds such as UTe.Comment: 9 pages, 4 figure

Dynamic critical exponents of the Ising model with multispin interactions

We revisit the short-time dynamics of 2D Ising model with three spin interactions in one direction and estimate the critical exponents $z,$ $\theta,$ $\beta$ and $\nu$. Taking properly into account the symmetry of the Hamiltonian we obtain results completely different from those obtained by Wang et al.. For the dynamic exponent $z$ our result coincides with that of the 4-state Potts model in two dimensions. In addition, results for the static exponents $\nu$ and $\beta$ agree with previous estimates obtained from finite size scaling combined with conformal invariance. Finally, for the new dynamic exponent $\theta$ we find a negative and close to zero value, a result also expected for the 4-state Potts model according to Okano et al.Comment: 12 pages, 9 figures, corrected Abstract mistypes, corrected equation on page 4 (Parameter Q

The role of collaborative networks in product-service system business models for an advanced manufacturing technology SME

This research appreciates the relevance of servitization business models for an Advanced Manufacturing Technology (AMT) SME in the Ornamental Stones (OS) cluster. A holistic conceptual model was designed and tested addressing strategy, organizational structure and technological infrastructure. Primary data gathered by semi-structured interviews were completed by unstructured observation and documentation studying. The model usefulness/usability was qualitatively confirmed by the outcomes relevance. As regards results, primary stages of servitization are already occurring in the case. They might progress towards advanced servitization, if both digital business platforms and Industry4.0 and collaborative networks are deployed. Moreover, the lack of open innovation in the OS SME generates strong feelings of ownership towards resources, which constrains servitization progress and provides a threat to cluster survival. However, a mandatory progress towards Building Information Modelling is expected, which is going to demand virtual breeding environments and virtual organizations that will leverage competitive advantage and enable servitization progress.info:eu-repo/semantics/acceptedVersio

The Adults and Older Adults Functional Assessment Inventory

[EN] Functional assessment methods are an important element in multidimensional neuropsychological evaluations, particularly in older adults. The Adults and Older Adults Functional Assessment Inventory is a new measure of basic and instrumental activities of daily living. Rasch model analyses were used to analyze the psychometric characteristics of the instrument in a sample of 803 participants. The original categories did not provide an optimal assessment of functional incapacity. The scale was dichotomized to achieve a better reliability score and item fit. The final 50 items revealed a moderately high variability in item difficulty, acceptable fits to items and persons, and a good Person Separation Reliability score. The scores were able to discriminate between normal controls and clinical patients. None of the items showed Differential Item Functioning associated with age, gender, or education. The instrument is able to achieve measures of functional incapacity with the useful properties of the Rasch model

Cognitive Factors and Gender Related to Self-reported Difficulties in Older Drivers

The purpose of this study is to determine the association between selfreported driving difficulties among older drivers and scores on specific cognitive tests. A cross-sectional study of 38 car drivers (22 men and 16 women), aged 61- 81 was carried out. The participants were volunteers recruited from two senior universities and a university health program for older drivers, in the area of Lisbon, Portugal. A battery of visual, psychomotor and cognitive measures was undertaken with a questionnaire about driving difficulties in a sample of healthy older adults. Difficulties in driving were the dependent variable in this study, defined as any reported difficulty in ≥ 4 driving situations. After a multivariate analysis, the independent factors significantly associated with driving difficulties were divided attention subtest of UFOV® (p=0.013), number of trials with success in the Tower of London (p=0.015) and gender (p=0.021). The drivers that reported difficulties in ≥ 4 driving situations made significantly less trials with success in the Tower of London test, had lower performances in divided attention between central and peripheral targets, and were more frequently females. Results suggest that planning ability, divided visual attention and gender are three important factors to be considered in the analysis of driving difficulties. However, further investigation with additional cognitive tests and driving measures (staterecorded crashes, driving simulator and on-road driving performance) could be developed in order to understand the factors related to driving difficulties in healthy older drivers

Produção e distribuição da biomassa da parte aérea do pinhão manso irrigado, aos dois anos de idade, em Santa Maria da Boa Vista-PE.

E em: CONGRESSO DA REDE BRASILEIRA DE TECNOLOGIA DE BIODIESEL, 3., 2009, Brasília, DF. Anais... Brasília, DF: MCT, 2009. p. 571-572

Efeito da irrigação no desenvolvimento vegetativo de macieiras cvs. "Galaxy" e "Fuji Suprema" na região dos Campos de Cima da Serra do RS.

O cultivo da macieira na região sul do Brasil tem sido efetuado, em geral, sem o uso da irrigação, entretanto, têm ocorrido períodos frequentes de déficit hídrico durante o ciclo, afetando, principalmente o crescimento inicial das plantas

Compostagem com aeração forçada como alternativa de aproveitamento dos resíduos gerados pela agroindústria conserveira.

A indústria de conservas tem grande importância na economia da região de Pelotas, RS, produzindo um grande volume de resíduos orgânicos que não possuem um fim adequado. O trabalho objetivou encontrar uma alternativa a esse problema através da compostagem dos produtos oriundos dessa atividade para que esses sejam reutilizados como adubo orgânico. O trabalho foi desenvolvido em uma agroindústria de Pelotas, onde montaram-se duas baterias de reatores de compostagem com um sistema de aeração forçada e controle de temperatura para a preparação do composto. Foram testadas combinações de materiais orgânicos, utilizando-se os resíduos originados da indústria conserveira, associados à material rico em carbono. Durante o processo foram avaliadas a evolução da temperatura interna, a evolução do pH, a determinação dos componentes químicos, a relação carbono/nitrogênio e a identificação de fungos presentes no composto. Foi possível constatar que o produto gerado é viável como substituto de parte da adubação química de um pomar, reduzindo-se com isso o custo de produção