Soil carbon sequestration rates under Mediterranean woody crops using recommended management practices : A meta-analysis

This work was supported by the projects: CARBOLIVAR (P11-RNM-7186) funded by Consejería de Innovación, Ciencia y Empresa of Junta de Andalucía and GEISpain project (CGL2014‐52838‐C2‐1‐R) funded by Ministerio de Economía y Competitividad, both including European Union ERDF funds. This work was also supported by the FPU 2012 grant program of the Ministerio de Educación, Cultura y Deporte of Spain. Dr. Roberto Garcia-Ruiz and Eduardo Aguilera gratefully acknowledge support by the Sustainable Farm Systems project (SSHRC 895-2011-1020) funded by the Canadian Social Sciences and Humanities Research Council.Peer reviewedPostprin

Non-linear response of single-molecule magnets: field-tuned quantum-to-classical crossovers

Quantum nanomagnets can show a field dependence of the relaxation time very different from their classical counterparts, due to resonant tunneling via excited states (near the anisotropy barrier top). The relaxation time then shows minima at the resonant fields H_{n}=n D at which the levels at both sides of the barrier become degenerate (D is the anisotropy constant). We showed that in Mn12, near zero field, this yields a contribution to the nonlinear susceptibility that makes it qualitatively different from the classical curves [Phys. Rev. B 72, 224433 (2005)]. Here we extend the experimental study to finite dc fields showing how the bias can trigger the system to display those quantum nonlinear responses, near the resonant fields, while recovering an classical-like behaviour for fields between them. The analysis of the experiments is done with heuristic expressions derived from simple balance equations and calculations with a Pauli-type quantum master equation.Comment: 4 pages, 3 figures. Submitted to Phys. Rev. B, brief report

Testing ZigBee Motes for Monitoring Refrigerated Vegetable Transportation under Real Conditions

Quality control and monitoring of perishable goods during transportation and delivery services is an increasing concern for producers, suppliers, transport decision makers and consumers. The major challenge is to ensure a continuous ‘cold chain’ from producer to consumer in order to guaranty prime condition of goods. In this framework, the suitability of ZigBee protocol for monitoring refrigerated transportation has been proposed by several authors. However, up to date there was not any experimental work performed under real conditions. Thus, the main objective of our experiment was to test wireless sensor motes based in the ZigBee/IEEE 802.15.4 protocol during a real shipment. The experiment was conducted in a refrigerated truck traveling through two countries (Spain and France) which means a journey of 1,051 kilometers. The paper illustrates the great potential of this type of motes, providing information about several parameters such as temperature, relative humidity, door openings and truck stops. Psychrometric charts have also been developed for improving the knowledge about water loss and condensation on the product during shipments

T35: a small automatic telescope for long-term observing campaigns

The T35 is a small telescope (14") equipped with a large format CCD camera installed in the Sierra Nevada Observatory (SNO) in Southern Spain. This telescope will be a useful tool for the detecting and studying pulsating stars, particularly, in open clusters. In this paper, we describe the automation process of the T35 and show also some images taken with the new instrumentation.Comment: 13 pages, 9 figures. Accepted for publication in the special issue "Robotic Astronomy" of Advances of Astronom

Patterns, localized structures and fronts in a reduced model of clonal plant growth

A simplified model of clonal plant growth is formulated, motivated by observations of spatial structures in Posidonia oceanica meadows in the Mediterranean Sea. Two levels of approximation are considered for the scale-dependent feedback terms. Both take into account mortality and clonal, or vegetative, growth as well as competition and facilitation, but the first version is nonlocal in space while the second is local. Study of the two versions of the model in the one-dimensional case reveals that both cases exhibit qualitatively similar behavior (but quantitative differences) and describe the competition between three spatially extended states, the bare soil state, the populated state, and a pattern state, and the associated spatially localized structures. The latter are of two types, holes in the populated state and vegetation patches on bare ground, and are organized within distinct snaking bifurcation diagrams. Fronts between the three extended states are studied and a transition between pushed and pulled fronts identified. Numerical simulations in one spatial dimension are used to determine front speeds and confront the predictions from the marginal stability condition for pulled fronts.Comment: 14 pages, 18 figures. To appear in Physica

Understanding Social and Cultural Contexts of Alcohol Misuse in Mexican-Origin Hispanic Men

Evidence suggests that Hispanic and non-Hispanic White men (NHW) have comparable prevalence rates of alcohol use. However, Hispanic men consistently have higher prevalence rates of alcohol misuse compared with NHW men. Consequently, Hispanic men experience disproportionate levels of adverse health consequences of alcohol misuse when compared with NHW men. The aim of this study was to explore Hispanic male perspectives and opinions regarding alcohol use patterns that may lead to disparate rates of alcohol misuse in Hispanic males. Demographic data were collected with questionnaires. Twenty semistructured one-on-one interviews were completed in English and Spanish with Mexican-origin Hispanic men (age: 44.6 +/- 11.3 years). A thematic analysis was conducted using a hybrid deductive-inductive strategy with an a priori codebook supplemented with iterative analysis of transcripts. Results suggest that alcohol misuse patterns in Hispanic males are influenced by an interaction between alcohol-related social norms and learned expressions of masculinity; a lack of knowledge of the alcohol-related health risks that further perpetuate the normalization of alcohol misuse; and expressions of masculinity and adaptive coping that lead to alcohol misuse as an escape from life stressors. Given the rapid expansion of the Hispanic population in the United States, and the disparate consequences of alcohol misuse in this population, it is imperative to consider the complex and often compounded impact of sociocultural norms and the social context on misuse-related behaviors. Viable prevention and treatment strategies should be addressed thought multicomponent, community-level strategies that more comprehensively address the complexities of alcohol misuse in this population.This item from the UA Faculty Publications collection is made available by the University of Arizona with support from the University of Arizona Libraries. If you have questions, please contact us at [email protected]