Estimation of the friction velocity in stably stratified boundary-layer flows over hills

A method is suggested for the calculation of the friction velocity for stable turbulent boundary-layer flow over hills. The method is tested using a continuous upstream mean velocity profile compatible with the propagation of gravity waves, and is incorporated into the linear model of Hunt, Leibovich and Richards with the modification proposed by Hunt, Richards and Brighton to include the effects of stability, and the reformulated solution of Weng for the near-surface region. Those theoretical results are compared with results from simulations using a non-hydrostatic microscale-mesoscale two-dimensional numerical model, and with field observations for different values of stability. These comparisons show a considerable improvement in the behaviour of the theoretical model when the friction velocity is calculated using the method proposed here, leading to a consistent variation of the boundary-layer structure with stability, and better agreement with observational and numerical data.

Orographic drag associated with lee waves trapped at an inversion

The drag produced by 2D orographic gravity waves trapped at a temperature inversion and waves propagating in the stably stratified layer existing above are explicitly calculated using linear theory, for a two-layer atmosphere with neutral static stability near the surface, mimicking a well-mixed boundary layer. For realistic values of the flow parameters, trapped lee wave drag, which is given by a closed analytical expression, is comparable to propagating wave drag, especially in moderately to strongly non-hydrostatic conditions. In resonant flow, both drag components substantially exceed the single-layer hydrostatic drag estimate used in most parametrization schemes. Both drag components are optimally amplified for a relatively low-level inversion and Froude numbers Fr ≈ 1. While propagating wave drag is maximized for approximately hydrostatic flow, trapped lee wave drag is maximized for l_2 a = O(1) (where l_2 is the Scorer parameter in the stable layer and a is the mountain width). This roughly happens when the horizontal scale of trapped lee waves matches that of the mountain slope. The drag behavior as a function of Fr for l_2 H = 0.5 (where H is the inversion height) and different values of l2a shows good agreement with numerical simulations. Regions of parameter space with high trapped lee wave drag correlate reasonably well with those where lee wave rotors were found to occur in previous nonlinear numerical simulations including frictional effects. This suggests that trapped lee wave drag, besides giving a relevant contribution to low-level drag exerted on the atmosphere, may also be useful to diagnose lee rotor formation.

Interaction of membrane mimetic vesicles with the antimicrobial peptide gomesin and its analogues

Fundação de Amparo à Pesquisa do Estado de São Paulo (FAPESP)

Assessment the Health Hazard from (222)Rn in Old Metalliferous Mines in San Luis, Argentina

Radon levels in two old mines in San Luis, Argentina, are reported and analyzed. The radiation dose and environmental health risk of (222)Rn concentrations to both guides and visitors were estimated. CR-39 nuclear track detectors were used for this purpose. The values for the (222)Rn concentration at each monitoring site ranged from 0.43 +/- 0.04 to 1.48 +/- 0.12 kBq m(-3) in the Los Cndores wolfram mine and from 1.8 +/- 0.1 to 6.0 +/- 0.5 kBq center dot m(-3) in the La Carolina gold mine, indicating that, in this mine, the radon levels exceed up to four times the action level of 1.5 kBq m(-3) recommended by the International Commission on Radiological Protection. The patterns of the radon transport process revealed that the La Carolina gold mine can be interpreted as a gas confined into a single tube with constant cross-section and air velocity. Patterns of radon activity, taking into account the chimney-effect winds, were used to detect tributary currents of air from shafts or larger fissures along the main adit of the Los Cndores mine, showing that radon can be used as an important tracer of tributary air currents stream out from fissures and smaller voids in the rock of the mine.

Occupational exposure to radon and natural gamma radiation in the La Carolina, a former gold mine in San Luis Province, Argentina

Radon and gamma radiation level measurements were carried out inside the La Carolina mine, one of the oldest gold mining camps of southern South America, which is open for touristic visits nowadays. CR-39 track-etch detectors and thermoluminescent dosimeters of natural CaF(2) and LiF TLD-100 were exposed at 14 points along the mine tunnels in order to estimate the mean (222)Rn concentration and the ambient dose equivalent during the summer season (November 2008 to February 2009). The values for the (222)Rn concentration at each monitoring site ranged from 1.8 +/- 0.1 kBq m(-3) to 6.0 +/- 0.5 kBq m(-3), with a mean value of 4.8 kBq m(-3), indicating that these measurements exceed in about three times the upper action level recommended by ICRP for workplaces. The correlations between radon and gamma radiation levels inside the mine were also investigated. Effective doses due to (222)Rn and gamma rays inside the mine were determined, resulting in negligible values to tourists. Considering the effective dose to the mine tourist guides, values exceeding 20 mSv of internal contribution to the effective doses can be reached, depending on the number of working hours inside the mine. (C) 2009 Elsevier Ltd. All rights reserved.

Petrology and geochemistry of the banded iron formation in the Eastern Sierras Pampeanas of San Luis (Argentina): Implications for the evolution of the Nogoli Metamorphic Complex

The metamorphosed banded iron formation from the Nogoli Metamorphic Complex of western Sierra de San Luis, Eastern Sierras Pampeanas of Argentina (Nogoli area, 32 degrees 55`S-66 degrees 15`W) is classified as an oxide facies iron formation of Algoma Type, with a tectonic setting possibly associated with an island arc or back arc, on the basis of field mapping, mineral and textural arrangements and whole rock geochemical features. The origin of banded iron formation is mainly related to chemical precipitation of hydrogenous sediments from seawater in oceanic environments. The primary chemical precipitate is a result of solutions that represent mixtures of seawater and hydrothermal fluids, with significant dilution by maficultramafic volcanic and siliciclastic materials. Multi-stage T(DM) model ages of 1670, 1854 and 1939 Ma and positive, mantle-like xi Nd((1502)) values of +3.8, +1.5 and +0.5 from the banded iron formation are around the range of those mafic to ultramafic meta-volcanic rocks of Nogoli Metamorphic Complex, which are between 1679 and 1765 Ma and +2.64 and +3.68, respectively. This Sm and Nd isotopic connection suggests a close genetic relationship between ferruginous and mafic-ultramafic meta-volcanic rocks, as part of the same island arc or back arc setting. A previous Sm-Nd whole rock isochron of similar to 1.5 Ga performed on mafic-ultramafic meta-volcanic rocks led to the interpretation that chemical sedimentation as old as Mesoproterozoic is possible for the banded iron formation. A clockwise P-T path can be inferred for the regional metamorphic evolution of the banded iron formation, with three distinctive trajectories: (1) Relict prograde M(1)-M(3) segment with gradual P and T increase from greenschist facies at M(1) to amphibolite facies at M(3). (2) Peak P-T conditions at high amphibolite-low granulite facies during M(4). (3) Retrograde counterpart of M(4), that returns from amphibolite facies and stabilizes at greenschist facies during M(5). Each trajectory may be regarded as produced by different tectonic events related to the Pampean? (1) and the Famatinian (2 and 3) orogenies, during the Early to Middle Paleozoic. The Nogoli Metamorphic Complex is interpreted as part of a greenstone belt within the large Meso- to Neoproterozoic Pampean Terrane of the Eastern Sierras Pampeanas of Argentina. (C) 2009 Elsevier Ltd. All rights reserved.

Luis Millones, Charles A. Dana Associate Professor of Spanish

Luis Millones, Charles A. Dana Associate Professor of Spanish reading Pliny's A Historie of the World

As "Confrarias" como um Fenômeno Organizacional Brasileiro: Notas Etnográficas de um Aprendiz de Bourdieu

Over the last years we have seen a significant increase in scholarly production within the organization studies field in Brazil. However it is still not representative. The tendency to consume foreign and fashionable ideas unrestrainedly, to make use of imported, universal and non-contextualized explanations to inquiry phenomenon which are essentially local and particular, make it difficult to develop a true Brazilian tradition. This work is a result of an ambitious ethnographic adventure" of an acknowledged apprentice of sociologist Pierre Bourdieu's large body of knowledge. It is about taking reflexivity to the limit. It is about learning "through the body" in an effort - both theoretical and empirical - to investigate a Brazilian organizational phenomenon which reproduces the hierarchical side of our society and, under the disguise of the legitimacy offered by organizational discourse, help keeping the very structure of our society in a silent but powerful way. I also want this work to be an alert for the importance of contextualization as a means to avoid a recurring distortion of the scholarly production in administrative science: the mobilization of theoretical references in such a safe way that make explicitness totally unnecessary, the appropriation of concepts whose essence is strange to the nature of the very phenomenon which they aim to explain, and the insistence in the impersonal style, in third-voice narratives, as if it were possible to produce knowledge in social sciences with absolute impartiality. "

Impactos emocionais causados pela mudança de estilo de gestão em um hospital na cidade de São Luis-MA

The objective of this study is to identify how a health institution can minimize the emotional impacts caused by the change of a style of classic management for a participative administration, that the workers and controllers can see the institution as a dynamic organization, that must be faced as an alive system, mobile and adaptable, where they is beings that have the right to react and to answer to the stimulatons. For that, the institution can handle motivator¿s instruments that develop in the people the potential to react of adequate way to the changes proposals, as well as increasing the perspective of possible technological improvements and interpersonal relationship between the internal and external customers. To change the style to manage, to hear the staff of support and user, are not part of the routine of the heads that develop classic management. This decision demands adaptation and flexibility, study, update and psychological preparation, to face common feelings to the new. It fits to the new directors, to visualize these feelings and work to minimize, avoiding future upheavals and the confrontation of situations that can harm the production of the company, as well as the quality of the communication between the diverse dimensions of the organization people. In this study case, based in phenomenological methodology, was possible to verify, through half-open interviews and comments, how was faced the feelings caused at the old direction time, composed for military who withheld the power and determined the actions of the hospital in study, was replaced by health professionals, that saw in the work team the best option to solve the problems and the potential to carry through an administration based in adequate strategies the reality of the moment, with the objective of reaching the satisfaction of the customer. Through this work, is possible to prove the theory that the changes cause impacts that affect the behavior of the people involved and cause stress, as well as conclude that despite the new direction show themselves, during the change, much made use to make right and involve all the workers, didn¿t have traced strategies to minimize the emotional impacts caused by the changes, what made all face their feelings of doubts and anxiety without no special care. Many obtained, by themselves, to face and to adapt the new proposals, but some could not assimilate the new administrative methodology and had been moved away definitively from the institution.

Consumo para obtenção de status: estudo empírico entre meninas pré-dolescentes de São Luis do Maranhão

The consumption of goods from brands in vogue, which symbolize status, popularity, success and social distinction, among those from the same social group in a pre-teenage girls¿ environment, has been a topic for academic studies as well as the market, due to their relevant consumption power for the companies worldwide. This paper aims to check out the use of these goods by them in São Luís, in order to become popular, succesful and socially distinguished; and the relation of the consumption for status with the brand image consumed and the pre-teenage girl self image; how familiar with the goods and the brand they are; and their attitude concerning their qualities. The empirical metodology had two phases: a qualitative and a quantitative one. The first one started with a specific group of 8 (eight) pre-teenage girls from high and medium classes, with the purpose of collecting some basis in order to reinforce the theory once the hypothesis were elaborated and used to guide the quantitative research as well as to adapt some North American scales. In the second stage of the qualitative research, a survey was applied in a convenience sample of 300 (three hundred) pre-teenage girls from São Luís, all from the high, medium high and low classes. The main result showed the pre-teenage girls from São Luís consume goods and brands for status, so they could get prestige, success, and social distinction, however, they do not define themselves or judge the social status of those from their social group based only on the clothes they wear and the brands which indicate their consumption power. Some other status symbols are important too, like, housing, the family car, the neighborhood where they dwell, the parents¿ occupation; the school they go to, the long and straight hair, how correct they speak Portuguese and their holiday trips. Another result highlighted was the strong relation of the brand image with their self image in the consumption for status.