Bouncing solutions in Rastall's theory with a barotropic fluid

Rastall's theory is a modification of Einstein's theory of gravity where the covariant divergence of the stress-energy tensor is no more vanishing, but proportional to the gradient of the Ricci scalar. The motivation of this theory is to investigate a possible non-minimal coupling of the matter fields to geometry which, being proportional to the curvature scalar, may represent an effective description of quantum gravity effects. Non-conservation of the stress-energy tensor, via Bianchi identities, implies new field equations which have been recently used in a cosmological context, leading to some interesting results. In this paper we adopt Rastall's theory to reproduce some features of the effective Friedmann's equation emerging from loop quantum cosmology. We determine a class of bouncing cosmological solutions and comment about the possibility of employing these models as effective descriptions of the full quantum theory.Comment: Latex file, 14 pages, 1 figure in eps format. Typos corrected, one reference added. Published versio

Doing the right thing or doing things right: what is better for a successful manufacturing reshoring?

The article concerns the revision of earlier decisions to offshore production activities (so called “relocation of second degree”); more specifically it is focused on the “reshoring” (also referred as “relocation to the home country”, “back-reshoring” or “back-shoring”). The research aims are to investigate what types of mistakes occur along the decision-making and implementation process and how they affect the outcome, in terms of success or failure, of a relocation strategy. A multiple case study involving four companies in the fashion industry from Portugal and Italy was conducted. The cross-case analysis allowed to differentiate decision-making mistakes from implementation ones and to assess differences and similarities among the cases in terms of content of the relocation, drivers and outcomes. The research contributes to previous literature on reshoring by bringing evidence of different types of mistakes to be considered, thus requiring further conceptualization of the reshoring process. Managers and entrepreneurs should consider the importance of doing the things right also during the implementation, too often underestimated. The present article is the first one in the reshoring literature bringing evidence of cases of failure in the relocation decisions and discriminating among different kinds of mistakes.info:eu-repo/semantics/publishedVersio

Classificação digital de imagens CBERS-2B para identificação de áreas de pastagem degradada.

Utilizar imagens do satélite CBERS-2B e técnicas de processamento de imagens para identificar as áreas de pastagem degradada com solo exposto, nas sub-bacias do ribeirão Barreiro e ribeirão Mandioca, no município de Camapuã.Poster. Trabalho apresentado na V Mostra de Trabalhos de Estagiários e Bolsistas, Campinas, out. 2009

Classificação de pastagem no município de Rio Negro, MS.

Neste contexto, este trabalho tem por objetivo classificar diferentes níveis de pastagens degradadas no município de Rio Negro, MS, utilizando para este fim a fusão de imagens dos sensores CCD e HRC do satélite CBERS-2B, ano base 2008

Use of Cellulosic Materials as Dye Adsorbents — A Prospective Study

Cellulose is the most abundant biopolymer of nature, and it is widely used in the synthesis of new materials as well as in the adsorption of dye. This study reports a literature review (articles) and technology review (patents) about publications and product invention, which contain information on the use of cellulose on the adsorption of dyes in the period 2004–2014. For this work, research database and keywords were used to find articles and patents related to the subject under review. Specific words were used to find articles and patents related to the subject under review. After a demanding research, 1 patent and 23 articles that contain the words “cellulose,” “dye,” and “adsorption or sorption” in their titles were assessed, and annual evolution studies were performed for publications and countries that publish more

Cryopreservation of Vasconcellea quercifolia St.-Hil (Caricaceae) Zygotic Embryos

Vasconcellea quercifolia A. St.-Hil. (Caricaceae) is a tropical fruit species native to Brazil, with a great importance in plant breeding programs. The V. quercifolia has a resistance to the main diseases of Caricaceae, Papaya Ringspot Virus (PRSV). Considering its potential, cryopreservation becomes a tool for the conservation of this species. The objective of this paper was to study the cryopreservation of V. quercifolia zygotic embryos through dehydration in silica gel. Excised zygotic embryos were dehydrated in silica at 0, 20, 40, 80 and 100 minutes and then inoculated in MS medium. The percentage of germinated and recovered embryos, and growth analysis were evaluated, besides water content. Subsequently, they were acclimatized in a growth room with temperature controlled. For cryopreservation, the embryos were excised and dehydrated in silica for 0, 20, 40 and 60 minutes, immersed in Liquid Nitrogen (LN) for 1 hour, thawed in Recovery Solution (RS) and inoculated in MS medium. After 30 days, the percentage of germinated and recovered embryos was evaluated. The silica gel promotes a fast dehydrate of embryos. The results showed that embryo dehydration affected seedling development, and dehydration for over 20 minutes showed a reduction in all evaluated parameters. The plantlets regenerated from embryos dehydrate survive the acclimatization. It was possible to cryopreserve the V. quercifolia zygotic embryos when the dehydration time of 20 minutes by silica gel was used

Indicação de áreas de pastagens degradadas nas bacias do ribeirão Mandioca e ribeirão Barreiro a partir de imagens CBERS.

A utilização de imagens de satélite juntamente com o sensoriamento remoto e o SIG (Sistema de Informação Geográfica), tem colaborado para identificação de áreas degradadas, constituindo uma importante ferramenta para o manejo dos recursos naturais. Este trabalho tem como objetivo identificar as áreas de solo exposto devido à degradação de pastagens nas áreas das sub-bacias do ribeirão Mandioca e ribeirão Barreiro, afluentes do rio Coxim, no município de Camapuã, Mato Grosso do Sul. Foram utilizadas imagens digitais obtidas em 21/04/2009, dos sensores CCD e HRC, do satélite CBERS-2B. As imagens foram georreferenciadas, realçadas e mosaicadas. Em seguida foi aplicado o modelo linear de mistura espectral com as bandas 2, 3 e 4. Foram realizadas classificações supervisionadas pixel a pixel em quatro conjuntos de atributos espectrais utilizando-se a técnica de MAXVER no SIG Spring. A classificação realizada com os atributos espectrais Solo, Vegetação e HRC na área de estudo mostrou ser a mais adequada para definição das áreas de pastagens degradadas com predominância de solo exposto. Essas áreas degradadas são encontradas principalmente nas encostas próximas aos rios, justificando o assoreamento dos mesmos.GeoPantanal 2009