Dynamics of the Distorted Diamond Chain

We present results on the dynamics of the distorted diamond chain, S=1/2 dimers alternating with single spins 1/2 and exchange couplings $J_1$ and $J_3$ in between. The dynamics in the spin fluid (SF) and tetramer-dimer (TD) phases is investigated numerically by exact diagonalisation for up to 24 spins. Representative excitation spectra are presented, both for zero magnetic field and in the 1/3 plateau phase and the relevant parameters are determined across the phase diagram. The behavior across the SF-TD phase transition line is discussed for the specific heat and for excitation spectra. The relevance of the distorted diamond chain model for the material Cu$_3$(CO$_3$)$_2$(OH)$_2$ (azurite) is discussed with particular emphasis on inelastic neutron scattering experiments, a recent suggestion of one possibly ferromagnetic coupling constant is not confirmed.Comment: 24 pages, 8 figure

Consistência do software zonexpert 1.0 no Município de Ituporanga-SC para a cultura da cebola

Trabalho de Conclusão de Curso - Universidade Federal de Santa Catarina. Curso de Agronomia

Finite Temperature Dynamics of the Spin 1/2 Bond Alternating Heisenberg Antiferromagnetic Chain

We present results for the dynamic structure factor of the S=1/2 bond alternating Heisenberg chain over a large range of frequencies and temperatures. Data are obtained from a numerical evaluation of thermal averages based on the calculation of all eigenvalues and eigenfunctions for chains of up to 20 spins. Interpretation is guided by the exact temperature dependence in the noninteracting dimer limit which remains qualitatively valid up to an interdimer exchange $\lambda \approx 0.5$. The temperature induced central peak around zero frequency is clearly identified and aspects of the crossover to spin diffusion in its variation from low to high temperatures are discussed. The one-magnon peak acquires an asymmetric shape with increasing temperature. The two-magnon peak is dominated by the S=1 bound state which remains well defined up to temperatures of the order of J. The variation with temperature and wavevector of the integrated intensity for one and two magnon scattering and of the central peak are discussed.Comment: 8 pages, 8 figure

Data Acquisition, Data Management and Subject Tracking in an RCT: Promoting Breast Cancer Screening in Non-Adherent Women

As part of the mini-symposium entitled Data Acquisition, Data Management, and Subject Tracking in Clinical and Translational Research: Seeking Solutions to Persistent Challenges, Dr. Luckmann\u27s presentation focuses on common challenges arising from his clinical research experience in the development and implementation of complex data systems for clinical studies

A Parametric Model for Operability of Offshore Support Vessels via Configuration-Based Design

TCC (graduação) - Universidade Federal de Santa Catarina. Campus Joinville. Engenharia Naval.O propósito das embarcações de apoio offshore (OSV’s) é dar suporte a indústria do petróleo para várias atividades no mar, como abastecimento, manuseio de âncora, reboque e construção. Para a adequada realização de cada operação, a embarcação requer diferentes habilidades à bordo, em que a disponibilidade e capacidade destas habilidades estão diretamente associadas ao nível operacional da embarcação. O principal objetivo deste trabalho é desenvolver um modelo paramétrico de um OSV para levar em conta as habilidades da embarcação e sua conexão com as principais operações que estes tipos de navio podem realizar, classificando os projetos através de um sistema de pontuação de acordo com o desempenho e custo de construção. O modelo consiste em equações paramétricas, baseadas em análises de regressão de embarcações semelhantes e em uma abordagem preliminar baseada na configuração de módulos específicos, como guindastes, acomodação extra e maior propulsão. O modelo levará em conta diferentes contextos no qual o navio irá operar (e.g. Mar do norte, Ártico e Brasil) e será desenvolvido em ferramentas comuns de engenharia, como Excel e JavaScript.The purpose of Offshore Support Vessels (OSVs) is to support the oil industry for the many activities in sea, such as supply, anchor handling, towing and construction. For the proper performance of each operation, a vessel requires different installed capabilities on board, in which the availability and capacity of these capabilities are directly connected to the operational level of the vessel. The main objective of this thesis is to develop a parametric model of an OSV to take into account the vessel capabilities and its connection to the main operations that these vessels can perform, ranking the designs in some sort of score according to performance and construction cost. The model consists on parametric equations, based on regression analysis from similar vessels, and on a preliminary configuration based approach for specific modules, such as cranes, extra accommodation and larger propulsion. The model will take into account different contexts in which the vessel will operate (e.g. North Sea, Arctic and Brazil). The model will be developed in common engineering tools, such as Excel and JavaScript

Labour‐saving technologies in smallholder agriculture: An economy‐wide model with field operations

Labour-saving technologies are relevant for agricultural development. Yet, as this study shows, they are poorly integrated into agricultural production functions of economy-wide models. We report a computable general equilibrium (CGE) model, which explicitly incorporating field operations (e.g. land preparation, weeding or harvesting) in the context of smallholder agriculture. The field operations approach allows to model technological trade-offs in organic and conventional production systems at various stages of the agricultural production process. Simulating a structural change scenario, we compare the performance of the field operations approach with published benchmark production structures by assessing how they replicate empirically observed changes in land and agrochemical use. This benchmark analysis shows that incorporating field operations replicates the observed empirical changes most accurately and allows for more realistic modelling of labour-saving technologies. We use the field operations model to investigate three policy options to mitigate labour shortages in the agricultural sector of Bhutan. Permitting the employment of Indian workers in agriculture has the highest short-term potential in this respect. We find that subsidising agricultural machinery hiring services and removing import tariffs on agrochemical inputs are found to be less effective. Further options for model developments, such as combining field operations and labour market seasonality, are highlighted.Stiftung fiat panis, Ulm, Germany http://dx.doi.org/10.13039/501100011087Humboldt‐Universität zu Berlin http://dx.doi.org/10.13039/501100006211Peer Reviewe

Avaliação do rastreamento para câncer de prostata em homens com antígeno prostático específico menor que 3,0 ng/ml.

Trabalho de Conclusão de Curso - Universidade Federal de Santa Catarina. Curso de Medicina. Dapartamento de Clínica Cirúrgica

The Integration of Palestinian-Israeli Labour Markets: A CGE Approach

Replaced with revised version of paper 07/12/11.labor market, CGE, Labor and Human Capital,