Analysis of simply supported wood beams at ambient and high temperatures

The main objective of this work is to present a methodology for safety analysis of simply supported wood beams at ambient and high temperatures with a concentrated load at mid-span. Sixteen different beam configurations will be studied. All calculations were conducted according the Eurocode 5, part 1-1 and part 1-2. During this study will be analyzed the safe load bearing capacity according standards and compared with the elastic and plastic load from beam theory. The beam theory can provide sufficient accuracy up to the point of instability. The standard methods are generally conservative and they are suitable to be used for design purposes with safety. The studied beam cross sections will be in glued laminated wood, as yellow birch, with characteristics equals to a Glulam GL28H.info:eu-repo/semantics/publishedVersio

Optical Density Of Bone Repair After Implantation Of Homogenous Demineralized Dentin Matrix In Diabetic Rabbits

This research evaluated the bone repair process after implantation of homogenous demineralized dentin matrix (HDDM) in surgical defects in the parietal bone of rabbits with alloxan-induced diabetes, using a polytetrafluorethylene (PTFe) barrier for guided bone regeneration. Thirty-six rabbits were used and divided into four groups: control (C, n = 12), diabetic (D, n = 12, left parietal bone), diabetic with PTFe (DPTFe, same 12 rabbits, right parietal bone), and diabetic with PTFe associated to HDDM (D-PTFe+HDDM, n = 12). Bone defects were created in the parietal bone of the rabbits and the experimental treatments were performed, where applicable. The rabbits were sacrificed after 15, 30, 60 and 90 days. The bone defects were examined radiographically and by optical density (ANOVA and Tukey test, p < .05). The radiographic findings showed that the D-PTFe+HDDM group presented greater radiopacity and better trabecular bone arrangement when compared to that of the C, D and D-PTFe groups. The statistical analysis showed significant differences in the optical density of the newly formed bone among the studied groups. It was possible to conclude that HDDM was biocompatible in diabetic rabbits.223275280Abreu, P.P., Morosolli, A., Araújo, M.M., Carvalho, V.A.P., Gomes, M.F., Effects of autogenous demineralized dentin matrix on dental socket wound healing process in human (2004) Braz Oral Res, 18, p. 52. , SupplCarvalho, V.A.P., Tosello, D.O., Salgado, M.A.C., Gomes, M.F., Histomorphometric analysis of homogenous demineralized dentin matrix as osteopromotive material in rabbit mandibules (2004) Int J Oral Maxillofac Implants, 19 (5), pp. 679-686Gomes, M.F., Anjos, M.J.S., Nogueira, T.O., Catanzaro-Guimarães, S.A., Autogenous demineralized dentin matrix for tissue engineering applications: Radiographic and histomorphometric studies (2002) Int J Oral Maxillofac Implants, 17 (4), pp. 488-497Gomes, M.F., Silva, M.J.S., Nogueira, T.O., Catanzaro-Guimarães, S.A., Histologic evaluation of the osteoinductive property of autogenous demineralized dentin matrix on surgical bone defects in rabbit skulls using human amniotic membrane for guided bone regeneration (2001) Int J Oral Maxillofac Implants, 16 (4), pp. 563-571Guyton, A.C., Hall, J.E., (2006) Insulin, Glucagon, and Diabetes mellitus, pp. 827-840. , Guyton AC, Hall JE. Textbook of Medical Physiology. 11th ed, Elsevier;Fiorellini, J.P., Nevins, M.L., Norkin, A., Weber, H.P., Karimbux, N.Y., The effect of insulin therapy on osseointegration in a diabetic rat model (1999) Clin Oral Implants Res, 10 (5), pp. 362-368Lu, H., Kraut, D., Gerstenfeld, L.C., Graves, D.T., Diabetes interferes with the bone formation by affecting the expression of transcription factors that regulate osteoblast differentiation (2003) Endocrinology, 144 (1), pp. 346-352Nevins, M.L., Karimbux, N.Y., Weber, H.P., Giannobile, W.V., Fiorellini, J.P., Wound healing around endosseous implants in experimental diabetes (1998) Int J Oral Maxillofac Implants, 13 (5), pp. 620-629Claro, F.A., Lima, J.R., Salgado, M.A.C., Gomes, M.F., Porous Polyethylene for tissue engineering applications in diabetic rats treated with calcitonin: Histomorphometric analysis (2005) Int J Oral Maxillofac Implants, 20 (2), pp. 211-219Catanzaro-Guimarães, S.A., Catanzaro Guimarães, B.P., Garcia, R.B., Alle, N., Osteogenic potential of autogenic demineralized dentin implanted in bony defects in dogs (1986) Int J Oral Maxillofac Surg, 15 (2), pp. 160-169Bessho, K., Tagawa, T., Murata, M., Purification of rabbit bone morphogenetic protein derived from bone, dentin, and wound tissue after tooth extraction (1990) J Oral Maxillofac Surg, 48 (2), pp. 162-169Nakashima, M., Induction of dentine in amputated pulp of dogs by recombinant human bone morphogenetic proteins-2 and -4 with collagen matrix (1994) Arch Oral Biol, 39 (12), pp. 1085-1089Catanzaro-Guimarães SA. Possibility to reinforce bone repair with decalcified dentin matrix. In: Gesellschaft für orale Implantologie (ed.). Jahrbuch für Orale Implatologie. Berlin: Quintessenz1993. p. 33-

Mapping density, diversity and species-richness of the Amazon tree flora

Using 2.046 botanically-inventoried tree plots across the largest tropical forest on Earth, we mapped tree species-diversity and tree species-richness at 0.1-degree resolution, and investigated drivers for diversity and richness. Using only location, stratified by forest type, as predictor, our spatial model, to the best of our knowledge, provides the most accurate map of tree diversity in Amazonia to date, explaining approximately 70% of the tree diversity and species-richness. Large soil-forest combinations determine a significant percentage of the variation in tree species-richness and tree alpha-diversity in Amazonian forest-plots. We suggest that the size and fragmentation of these systems drive their large-scale diversity patterns and hence local diversity. A model not using location but cumulative water deficit, tree density, and temperature seasonality explains 47% of the tree species-richness in the terra-firme forest in Amazonia. Over large areas across Amazonia, residuals of this relationship are small and poorly spatially structured, suggesting that much of the residual variation may be local. The Guyana Shield area has consistently negative residuals, showing that this area has lower tree species-richness than expected by our models. We provide extensive plot meta-data, including tree density, tree alpha-diversity and tree species-richness results and gridded maps at 0.1-degree resolution

Tipo de conhecimento sobre inclusão produzido pelas pesquisas Type of knowledge about inclusion produced by research

As pesquisas brasileiras sobre produção de conhecimento no campo da Educação Especial iniciaram-se há mais de 15 anos. No presente objetivou-se analisar o tipo de conhecimento produzido nessa área frente à metodologia empregada nas dissertações e teses financiadas pelo Programa de Apoio a Educação Especial. Os trabalhos de conclusão de curso analisados referiam-se àqueles projetos aprovados pelo Proesp no âmbito do Estado de São Paulo. O período de análise ficou compreendido entre 2004 e 2008. Vinte e sete estudos foram localizados. A análise dos estudos foi realizada por meio de cinco categorias: 1) pesquisas que apresentaram generalização e aplicação imediata dos resultados; 2) pesquisas que apresentaram resultados imediatos para um grupo específico de participantes; 3) pesquisas descritivas com achados inovadores; 4) pesquisas de intervenção com achados inovadores; 5) pesquisas descritivas que corroboraram outras pesquisas. Foi possível concluir que os estudos avançaram nos conhecimentos sobre a inclusão e que o uso de metodologias pouco utilizadas no campo da educação serviu de subsídio para obter os resultados.<br>The Brazilian research on knowledge production in the field of Special Education began more than 15 years ago. The objective was to analyze the type of knowledge produced in the area before the methodology used in dissertations funded by the "Programa de Apoio a Educação Especial - PROESP". The final paper analyzed referred to those projects approved by PROESP within the State of São Paulo. The analysis period was between 2004 and 2008. Twenty-seven studies were found. The review was conducted through five categories: 1) studies that showed generalization and immediate application of the results, 2) research that showed immediate results for a specific group of participants, 3) descriptive research with innovative findings, 4) intervention research with innovative findings and 5) descriptive research that corroborated other studies. It was concluded that the studies advance in knowledge on inclusion and the use of some infrequent methodologies in education served as a subsidy to get the results