An inventory of state natural resources information systems

The status of a project to inventory state natural resources information systems is summarized. All tasks accomplished are described, and tasks remaining to be completed are outlined

Academic-Community Partnerships: Effectiveness Evaluated Beyond the Ivory Walls

Community-based participatory research (CBPR) has furthered our understanding of the working principles required for academic-community partnerships to address persistent public health problems. However, little is known about how effective these partnerships have been in eliminating or reducing community-based public health issues. To contribute to the literature in this area, the authors conducted a survey of U.S. schools and programs in public health and community groups working with these academic partners to: (1) identify the most common local public health issues addressed; (2) examine the characteristics of the partnership and the actual or perceived benefits and challenges for each partner; (3) assess the perceived effectiveness of the partnership and their evaluation techniques; and (4) analyze the intent to continue or dissolve the partnership and the associated factors that influence this decision. The authors provide recommendations that can improve the development, functioning, and effectiveness of academic-community collaborations aimed at addressing a variety of public health concerns

Heavy Quark Thermalization in Classical Lattice Gauge Theory: Lessons for Strongly-Coupled QCD

Thermalization of a heavy quark near rest is controlled by the correlator of two electric fields along a temporal Wilson line. We address this correlator within real-time, classical lattice Yang-Mills theory, and elaborate on the analogies that exist with the dynamics of hot QCD. In the weak-coupling limit, it can be shown analytically that the dynamics on the two sides are closely related to each other. For intermediate couplings, we carry out non-perturbative simulations within the classical theory, showing that the leading term in the weak-coupling expansion significantly underestimates the heavy quark thermalization rate. Our analytic and numerical results also yield a general understanding concerning the overall shape of the spectral function corresponding to the electric field correlator, which may be helpful in subsequent efforts to reconstruct it from Euclidean lattice Monte Carlo simulations.Comment: 22 pages. v2: a reference and clarifications added; published versio

A way to estimate the heavy quark thermalization rate from the lattice

The thermalization rate of a heavy quark is related to its momentum diffusion coefficient. Starting from a Kubo relation and using the framework of the heavy quark effective theory, we argue that in the large-mass limit the momentum diffusion coefficient can be defined through a certain Euclidean correlation function, involving color-electric fields along a Polyakov loop. Furthermore, carrying out a perturbative computation, we demonstrate that the spectral function corresponding to this correlator is relatively flat at small frequencies. Therefore, unlike in the case of several other transport coefficients, for which the narrowness of the transport peak makes analytic continuation from Euclidean lattice data susceptible to severe systematic uncertainties, it appears that the determination of the heavy quark thermalization rate could be relatively well under control.Comment: 17 pages. v2: clarifications and references added, published versio

Iron Displacements and Magnetoelastic Coupling in the Spin-Ladder Compound BaFe2Se3

We report long-range ordered antiferromagnetism concomitant with local iron displacements in the spin-ladder compound BaFe$_2$Se$_3$. Short-range magnetic correlations, present at room temperature, develop into long-range antiferromagnetic order below T$_N$ = 256 K, with no superconductivity down to 1.8 K. Built of ferromagnetic Fe$_4$ plaquettes, the magnetic ground state correlates with local displacements of the Fe atoms. These iron displacements imply significant magnetoelastic coupling in FeX$_4$-based materials, an ingredient hypothesized to be important in the emergence of superconductivity. This result also suggests that knowledge of these local displacements is essential for properly understanding the electronic structure of these systems. As with the copper oxide superconductors two decades ago, our results highlight the importance of reduced dimensionality spin ladder compounds in the study of the coupling of spin, charge, and atom positions in superconducting materials

Qualidade e diferenciação em torno do café: modelos em concorrência.

O objetivo deste trabalho consiste em discutir dois enfoques divergentes em torno da cafeicultura com vistas a fornecer elementos de análise para uma pesquisa acerca das dinâmicas territoriais, agricultura e sociedade. Cada vez mais, oportunidades se desenham para uma revalorização da cafeicultura, particularmente em sintonia com as idéias de fortalecer a agricultura familiar, de promover as dinâmicas territoriais e de preservar o meio ambiente. Porém, estas oportunidades concorrem com um modelo dominante de conceber os sistemas agro-alimentares no Brasil, no qual a agricultura consiste apenas em suporte para a produção de commodities indiferenciadas, baratas e abundantes

Orbital Selective Magnetism in the Spin-Ladder Iron Selenides Ba1−x_{1-x}Kx_{x}Fe2_2Se3_3

Here we show that the 2.80(8) {\mu}B/Fe block antiferromagnetic order of BaFe2Se3 transforms into stripe antiferromagnetic order in KFe2Se3 with a decrease in moment to 2.1(1) {\mu}B/Fe. This reduction is larger than expected from the change in electron count from Ba$^{2+}$ to K$^{+}$, and occurs with the loss of the displacements of Fe atoms from ideal positions in the ladders, as found by neutron pair distribution function analysis. Intermediate compositions remain insulating, and magnetic susceptibility measurements show a suppression of magnetic order and probable formation of a spin-glass. Together, these results imply an orbital-dependent selection of magnetic versus bonded behavior, driven by relative bandwidths and fillings.Comment: Final versio

Identificação de dinâmicas sociais e econômicas na construção territorial de cafés de qualidade diferenciada no Sul de Minas.

O Sul de Minas é a maior região produtora de café do país e o espaço geográfico de Machado, Poço Fundo e Campestre, aí localizado, compreende um dos mais destacados conjuntos de municípios sob o ponto de vista do cultivo. A base técnica e social sob a qual a cultura do café destas três áreas se desenvolveu historicamente é caracterizada por numerosas e pequenas explorações familiares. O café é de toda evidência responsável por uma identidade territorial aí existente, o que torna pertinente uma pesquisa nestes municípios do Sul de Minas Gerais, com ênfase nos conhecimentos, práticas e representações utilizadas na produção, usos, difusão e conservação de recursos do território. O objetivo da pesquisa é buscar respostas aos problemas do desenvolvimento territorial sustentável e, para tal, destacou inicialmente o município de Poço Fundo, dentre os três mencionados. A partir da conclusão do mapeamento de projetos coletivos, atores sociais e programas públicos, esta fase da pesquisa, aqui em destaque, buscou identificar as dinâmicas sociais e econômicas capazes de caracterizar o processo de construção de território junto a gestores públicos e atores representativos dos projetos coletivos, por intermédio do uso de entrevistas apoiadas em um roteiro único semi-estruturado