Microbial Fuel Cells (MFCs) are emerging as novel equipment to harvest bioelectricity from organic matter. In this study, double and single chamber microbial fuel cells, six units in all, were fabricated and simultaneously operated in batch mode for period of 30 days. Natural cattle dung slurry was used as substrate along with methylene blue and potassium permanganate as mediators to enhance the electron transfer rate, and further augment electrical parameters. Experimentation of MFCs with three types of anode electrodes viz. carbon electrode, copper electrode and zinc electrode subjected to similar conditions was evaluated. Performance was evaluated independently and compared by plotting polarization data generated during the testing period. Maximum current and power densities have been achieved from these MFCs and best attained values are 1858 mA/m2 and 1465 mW/m2 for single chamber zinc-carbon electrode MFC. The analogous result presents that metal electrode zinc MFC has the better power density as compare to carbon electrode MFC. Being more conductive, metal electrodes have the better capability to replace the carbon family electrodes for MFC based power applications. Although the MFCs power generation is low, but modifications in configuration, electrodes, mediators and power management may enhance the power output to a significant level for commercialization of this technology.
This article is devoted to the study of the immune status in children with pathology of the pancreas. In the analysis of changes of immune status in children with chronic pancreatitis revealed the greatest decline in T-cell level and components of complement, a decrease level of immunoglobulin A. In patients with reduced content of IFN-? FNO-?.
Abstract: The aim of the article is a description and characteristics of typological, structural and acoustic requirements of rehearsal spaces for presenting rock and pop music. It includes initial requirements for the spaces, the suitability of their combination with other functions, or spaces, as well as their integration into the environment. It presents a case study, points to the problems in the acoustic design of a music rehearsal space in a music centre building.
Esta monografía trata de influencia de la deformación de las puntas sobre su vida útil total. Presenta la influencia de las propiedades del material, la tecnología de producción y la intensidad de carga de los electrodos de soldadura sobre la vida útlil de las mismas. Han sido evaluadas las puntas más usuales en la práctica (aleación de CuCr1Zr) de tres formas establecidas antes de soldadura por puntos por resistencia y después del proceso de soldadura. El proceso de soldadura por puntos por resistencia se realiza a parámetros de soldadura bajos, medios y altos en la máquina de soldadura por puntos pneumática programable VTS BPK 20. Se ha evaluado la influencia de los parámetros de soldadura por puntos sobre las seleccionas características materiales de los materiales de puntas de soldadura. Mediante la prueba de recalcado fue estudiada dependencia de la resistencia transformable y deformación del material en la tecnología utilizada en producción de puntas.