526 research outputs found
Introduction to Holographic Superconductors
These lectures give an introduction to the theory of holographic
superconductors. These are superconductors that have a dual gravitational
description using gauge/gravity duality. After introducing a suitable
gravitational theory, we discuss its properties in various regimes: the probe
limit, the effects of backreaction, the zero temperature limit, and the
addition of magnetic fields. Using the gauge/gravity dictionary, these
properties reproduce many of the standard features of superconductors. Some
familiarity with gauge/gravity duality is assumed. A list of open problems is
included at the end.Comment: 34 pages, 10 figures, to appear in the proceedings of the 5th Aegean
Summer School, "From Gravity to Thermal Gauge Theories: the AdS/CFT
Correspondence"; v2: references adde
Tin determination in fistula seals from Conimbriga and Augusta Emerita
info:eu-repo/semantics/publishedVersio
Farmerâs evaluation of a rolling canvas prototype against his own system for harvesting olives
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., AraĂșjo, 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-GuimarĂŁes, 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-GuimarĂŁes, 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-GuimarĂŁes, S.A., Catanzaro GuimarĂŁes, 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-GuimarĂŁes SA. Possibility to reinforce bone repair with decalcified dentin matrix. In: Gesellschaft fĂŒr orale Implantologie (ed.). Jahrbuch fĂŒr Orale Implatologie. Berlin: Quintessenz1993. p. 33-
Competição de cultivares de abacaxi em Linhares, ES
The pineapple cultivars (Ananas comosus) Smooth Cayenne, PĂ©rola-da-Paraiba, PĂ©rola-da-Serra and Boituva, were compared. Smooth Cayenne produced significantly heavier fruits with largeat crown at the level of 5%. The penducle length of PĂ©rola-da-Serra local cultivar was longer. Cultivars PĂ©rola-da-Serra, PĂ©rola-da-ParaĂba and Boituva presented longer fruits, averaging 21.83 cm, 21.39 cm and 20.92cm respectively.Foram comparadas as cultivares de abacaxi (Ananas comosus) Smooth Cayenne, PĂ©rola-da-ParaĂba, PĂ©rola-da-Serra e Boituva. A Smooth Cayenne produziu frutos significativamente mais pesados e com maior coroa, ao nĂvel de 5%. O comprimento do pedĂșnculo da PĂ©rola-da-Serra foi maior do que o das outras. A PĂ©rola-da-Serra, a PĂ©rola-da-ParaĂba e a Boituva apresentaram frutos mais compridos, com as respectivas mĂ©dias de: 21,8, 21,39 e 20,92 cm
Farmerâs evaluation of a rolling canvas prototype against his own system for harvesting olives
An olive grower was invited to organise a full day harvesting test based on two rolling canvas prototypes, using his own trunk shaker, tractors and labour. This paper reports the results observed, making also a comparison with the usual harvesting method followed by the farmer, based on a trunk shaker and canvas manually placed under the trees.
Results show that the rolling canvas based system has got a slightly higher work rate, and according to the workers, is less demanding in terms of physical effort
The Kuiper Belt and Other Debris Disks
We discuss the current knowledge of the Solar system, focusing on bodies in
the outer regions, on the information they provide concerning Solar system
formation, and on the possible relationships that may exist between our system
and the debris disks of other stars. Beyond the domains of the Terrestrial and
giant planets, the comets in the Kuiper belt and the Oort cloud preserve some
of our most pristine materials. The Kuiper belt, in particular, is a
collisional dust source and a scientific bridge to the dusty "debris disks"
observed around many nearby main-sequence stars. Study of the Solar system
provides a level of detail that we cannot discern in the distant disks while
observations of the disks may help to set the Solar system in proper context.Comment: 50 pages, 25 Figures. To appear in conference proceedings book
"Astrophysics in the Next Decade
Mechanical harvesting of 400 trees per hectare olive orchards based on a rolling canvas prototype
Towards higher densities of trees per hectare different alternatives are required 10 collect olives harvested by trunk shakers. This paper puts forward a revised concept of the trailed can with a rolling canvas system. The equipment consists of a 6m lung box welded 10 a wheeled chassis with a rolling canvas system placed over its full length
Calagem e adubação potåssica na produção do cupuaçuzeiro em sistemas agroflorestais da AmazÎnia Ocidental
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