Hybrid AC-DC standalone system based on PV array and wind turbine

This paper presents a new topology of hybrid AC-DC standalone system based on solar photo-voltaic (PV) array and wind turbine (WT) feeding three-phase four-wire loads. The proposed hybrid system employs two back to back converters and dc-dc boost converter to achieve maximum power point tracking (MPPT). To balance the power at the PCC, the system is reinforced by BESS (Battery Energy Storage System) to keep constant frequency and voltage and to improve the power quality. The dump load is added to the system and is placed at the common dc bus to manage the extra power when the battery is fully charged. The capacitor bank is used to provide the reactive power to the doubly fed induction generator (DFIG). The proposed system is studied for various types of linear, nonlinear and dynamic loads and under varying climate conditions. The dynamic behavior of the proposed system is verified using MATLAB/Simulink

Pulmonary paracoccidioidomycosis in immunized mice

Paracoccidioidomycosis was induced in immunized (IM) and non-immunized (NI) mice. The histopathology, the number of fungi in the lungs, the cellular (footpad test - FPT and macrophage inhibition factor assay - MIF) and humoral (immunodiffusion test) immune response were investigated serially postinfection. In the IM mice, at days 1 and 3, there was intense and predominant macrophagic-lymphocytic alveolitis with loose granulomatous reaction; at day 30, inflammation was mild. In the NI group, up to day 3, the lesions were focal; later there was formation of extensive epithelioid granuloma. The number of fungi in IM mice were always smaller than those of NI group. Immunization alone induced positive FPT and MIF indices with low titer of antibody. After infection, there was a significant decrease of the FPT indices in the IM group, which we interpreted as desensitization due to trapping of sensitized lymphocytes in the lungs. In conclusion, (1) The lesional pattern of pulmonary paracoccidioidomycosis in IM mice was similar to that of a hypersensitivity pneumonitis. This reaction was probably effective in reducing the extension of the infection and decrease the number of fungi. (2) In this model, pulmonary resistance against P. brasiliensis seems to be related to local and systemic delayed-type hypersensitivity reaction. © 1992 Kluwer Academic Publishers

Hybrid standalone power generation system using hydro-PV-battery for residential green buildings

This paper deals with control of hybrid standalone power generation using micro-hydro power turbine (MHP) coupled with a squirrel cage induction generator (SCIG) and a solar photovoltaic panel (PV), which is connected to the common DC bus of three-phase voltage source converter (VSC). The AC terminals of VSC are connected to point of common coupling (PCC) through interface inductors. A battery energy storage system (BESS) is also tied with the common DC bus through a buck-boost converter. The proposed system is mostly suitable to serve the power needs of any small size residential green building situated near a small river or cannel. Control algorithms are proposed for the three-phase VSC and the DC-DC buck-boost converter in order to extract the maximum power from PV array with single-stage conversion, to regulate the AC voltage and frequency at PCC and to improve the power quality. The effectiveness and the robustness of proposed controllers are validated by simulation using Matlab/Simulink at linear and nonlinear loads under different climate conditions

INVIVO and INVITRO EVALUATION of CELL-MEDIATED-IMMUNITY in PATIENTS WITH PARACOCCIDIOIDOMYCOSIS

ESCOLA PAULISTA MED,DEPT MICROBIOL IMUNOL & PARASITOL,São Paulo,BRASILUNIV São Paulo,FAC MED CLIN HOSP,DEPT CLIN MED,SECAO ALERGIA,São Paulo,BRASILESCOLA PAULISTA MED,DEPT MICROBIOL IMUNOL & PARASITOL,São Paulo,BRASILWeb of Scienc

Investigation of the electronic and magnetic properties of Mn doped ZnO using the FP-LAPW method

We report on the results of the structural, electronic and magnetic properties of ZnO (1 x 1 x 1), (1 x 2 x 2) in the zincblende (ZB) and rocksalt (RS) phases produced by doping Mn in ZnO structures, considering, for the magnetic interaction between the Mn atoms, both the near and far positions. These are evaluated using density functional theory (DFT). The band gaps of the ZnO semiconductor are calculated by the full potential linearized augmented plane wave (FP-LAPW) method with the local spin density approximation (LSDA) and the modified Becke-Johson (mBJ) potential. The results of the theoretical calculations are compared to the experimental values. The gaps of RS-ZnO are 0.735(LDA) eV and 2.688(LDA+mBJ) eV. They are comparable to 2.45 eV; in the zincblende phase, the gaps are 0.694(LDA) eV and 2.946(LDA+mBJ) eV compared to the 3.27 eV experimental value. Both the band gap and the total magnetic moment of Mn doped ZnO increased in the supercell 1 x 2 x 2 for the RS and ZB phases. Our analysis revealed that the mBJ potential is very efficient for the determination of the band gaps of ZnO semiconductors; it is clear that the mBJ potential gives good results for the treatment of the d-orbitals. (C) 2017 The Physical Society of the Republic of China (Taiwan). Published by Elsevier B.V. All rights reserved.WOS:0004076130000392-s2.0-8502784796