IVG: Um indutor de alterações psicológicas? Estudo dos níveis de depressão, ansiedade e stress em mulheres no pré e pós I.V.G.

Dissertação de Mestrado apresentada ao Instituto Superior de Psicologia Aplicada para obtenção de grau de Mestre na especialidade de Psicologia Clínica.

Carrier-transport studies of III-nitride/Si3N4/Si isotype heterojunctions

GaN/Si3N4/n-Si and InN/Si3N4/n-Si heterojunctions (HJs) were fabricated using plasma-assisted molecular beam epitaxy for a comparison study. Single-crystalline wurtzite structures of GaN and InN epilayers were confirmed by high-resolution X-ray diffraction and thickness of ultrathin Si3N4 layer was measured by transmission electron microscopy. n-GaN/Si3N4/n-Si HJs show diode-like rectifying current-voltage (I-V) characteristic, while n-InN/Si3N4/n-Si HJs show symmetric nonlinear I-V behavior. The I-V characteristics of both HJs were discussed in terms of the band diagram of HJs and the carrier transport mechanism. The activation energies of carrier conduction were estimated to be similar to 29 meV for GaN/Si3N4/Si and similar to 95 meV for InN/Si3N4/Si HJs. (C) 2012 WILEY-VCH Verlag GmbH & Co. KGaA, Weinheim

Resistive-Switching Behavior in Polycrystalline CaCu3Ti4O12 Nanorods

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

Nonlinear Transport in Hybrid Polypyrrole-Gold Nanostructures

We have studied charge transport in nanometer scale films of polypyrrole (PPy) that were grown electrochemically onto discontinuous ultrathin films of gold. The gold films consisted of 100 nm size islands, separated from each other by nanometer-size gaps. The thickness of PPy can be varied from 30 to 200 nm. The I-V characteristics of these hybrid PPy-Au nanostructures show strong non-linearity at low temperatures, and in particular for the more insulating samples. The hopping transport is further verified from the log / versus V-1/4 plots. Furthermore, the I-V data follow an empirical relation dlog//dV(1/4) similar to T-1/2.

Nonlinear electrical behaviour of the Cr2O3, ZnO, CoO and Ta2O5-doped SnO2 varistors

The effects of Cr2O3 on the properties of (Zn, Co, Ta)-doped SnO2 varistors were investigated in this study. The samples with different Cr2O3 concentrations were sintered at 1400 degrees C for 2 h. The properties of (Zn, Co, Ta, Cr)-doped SnO2 varistors were evaluated by XRD. dilatornetry, SEM, I-V and impedance spectroscopy. DC electrical characterization showed a dramatic increase ill the breakdown electrical field and in the nonlinear coefficient with the increase in Cr2O3 concentration. The grain size was found to decrease from 13 to 5 mu m with increasing the Cr2O3 content. The impedance data, represented by means of Nyquist diagrams, show two time constants, one at low frequencies and the other at high frequencies. (c) 2005 Elsevier Ltd and Techna Group S.r.l. All rights reserved.

Dependence of La2O3 content on the nonlinear electrical behaviour of ZnO, CoO and Ta2O5 doped SnO2 varistors

The effects of La2O3 on the properties of (Zn, Co, Ta) doped SnO2 varistors were investigated in this study. The samples with different La2O3 concentrations were sintered at 1400 degrees C for 2 h and their properties were characterized by XRD, SEM, I-V and impedance spectroscopy. The grain size was found to decrease from 13 pm to 9 gm with increasing La2O3 content. The addition of rare earth element leads to increase the nonlinear coefficient and the breakdown voltage. The enhancement was expected to arise from the possible segregation of lanthanide ion due to its larger ionic radius to the grain boundaries, thereby modifying its electrical characteristics. Furthermore, the dopants such as La may help in the adsorption of O' to O '' at the grain boundaries characteristics. (c) 2006 Elsevier B.V. All rights reserved.

Relaxation-chaos phenomena in celestial mechanics. I. On wisdom's model for the 3/1 kirkwood gap

Sudden eccentricity increases of asteroidal motion in 3/1 resonance with Jupiter were discovered and explained by J. Wisdom through the occurrence of jumps in the action corresponding to the critical angle (resonant combination of the mean motions). We pursue some aspects of this mechanism, which could be termed relaxation-chaos: that is, an unconventional form of homoclinic behavior arising in perturbed integrable Hamiltonian systems for which the KAM theorem hypothesis do not hold. © 1987.

Krestʹi︠a︡nskoe di︠e︡lo v t︠s︡arstvovanīe imperatora Aleksandra II. Materīaly dli︠a︡ istorīi osvobozhdenīi︠a︡ krestʹi︠a︡n.

Added. t.p.: Gubernskīe komitety, ikh deputaty i Redakt︠s︡īonnyi︠a︡ kommissīi v krestʹi︠a︡nskom di︠e︡li︠e︡.

Gorodskīi︠a︡ poselenīi︠a︡ v Rossīĭskoĭ Imperīi.

Vols. 3-<4, 5, pt. 1> have imprint: S.-Peterburg : V Tip. K. Vulʹfa.

Slovarʹ istoricheskīĭ o svi︠a︡tykh, proslavlennykh v rossīĭskoĭ t︠s︡erkvi, i o ni︠e︡kotorykh podvizhnikakh blagochestīi︠a︡, mi︠e︡stno chtimykh.

Mode of access: Internet.

V.G. Bi︠e︡linskīĭ. Ri︠e︡chʹ, proiznesennai︠a︡ vesnoi︠u︡ 1898 g. po sluchai︠u︡ 50-li︠e︡tīi︠a︡ so dni︠a︡ smerti Belinskago na russkikh sobranīi︠a︡kh v Zhenevi︠e︡, T︠S︡i︠u︡rikhi︠e︡ i Berni︠e︡.

Cover title.

O sredstvakh k ustranenii͡u ėkonomicheskikh i finansovykh zatrudneniĭ v Rossii : statʹi i zami͡etki kasai͡ushchii͡asi͡a ėtogo predmeta /

Mode of access: Internet.

Kak budut proizvedeny vybory v Uchreditelʹnoe Sobranīe : polozhenīe o vyborakh v obshchedostupnom izlozhenīi /

At head of title: Izdanīe Vserossīĭskago T͡Sentralʹnago Ispolnitelʹnago Komiteta Sovi͡etov Rabochikh i Soldatskikh Deputatov.

Inventarnyĭ katalog kleĭm na amfornykh ruchkakh i gorlyshkakh i na cherepit︠s︡akh ėrmitazhnagʹo sobranīi︠a︡. S Z risunkami v teksti︠e︡, 15 fototipicheskimi i l avtotipicheskoi︠u︡ tablit︠s︡ami.

Romanized record.

Granular superconductors:from the nonlinear σ model to the Bose-Hubbard description

We modify a nonlinear σ model (NLσM) for the description of a granular disordered system in the presence of both the Coulomb repulsion and the Cooper pairing. We show that under certain controlled approximations the action of this model is reduced to the Ambegaokar-Eckern-Schön (AES) action, which is further reduced to the Bose-Hubbard (or “dirty-boson”) model with renormalized coupling constants. We obtain an effective action which is more general than the AES one but still simpler than the full NLσM action. This action can be applied in the region of parameters where the reduction to the AES or the Bose-Hubbard model is not justified. This action may lead to a different picture of the superconductor-insulator transition in two-dimensional systems.