The controlled electrochemical etching at room temperature of deep (up to 200 μm) silicon microstructures with aspect ratio ranging from 5 to 100 and etching rates from 10 to 3 μm/min, respectively, is here reported and discussed. This allows silicon microfabrication technology entering a region in the parameter space etching-rate vs. aspect-ratio that was so far unreachable for silicon microst...

n-Glucose-6-phosphate dehydrogenase (Zwischenferment) was discovered by Warburg and Christian in 1931 (1, 2). An active preparation was obtained then from horse erythrocytes and in 1932 from the Lebedev juice made from brewers’ yeast (3). Because of its extreme specificity, this enzyme has become an important analytical tool. Various preparations of it have been described, the first being those...

Illumination affects corrosion of oxide-covered metals via photoinitiated dissolution processes. Herein, anodized titanium with n-type semiconducting anatase TiO2 and copper p-type cuprite Cu2O thicknesses up to ≈90 nm are prepared, investigated under controlled convection in photoelectrochemical experiments illuminated at grazing incidence. photon energies above the bandgap triggers anodic pho...

This paper shows a correlation between surface effective porosity due to various sintering regimes and humidity sensitive electrical properties of the perovskite-based bulk type sensors, at room temperature. Furthermore, temperature transduction mechanism thick film sensors was studied in detail through electrochemical impedance spectroscopy (EIS) major transmissive components were detected by ...

this research work is devoted to the development of a mathematical model for the simulation of the flow of polymeric melts through the die region of extruders. a set of governing equations are solved using finite element method. standard galerkin technique is used in conjunction with the mixed scheme to solve the flow equation. due to the non-linear nature of global equations, the picard iterat...

in this paper‎, ‎we introduce a new model of point free topology‎ ‎for point-set topology‎. ‎we study the basic concepts in this‎ ‎structure and will find that it is naturally close to point-set‎ ‎topology‎.‎

in recent year, the evolutionary structural optimization (eso) method, has been applied as an effective tool for structures design. the concept of eso method is to use the finite element  results in each iteration of process and removal of inefficient material based on these results. in this method there are several experimental parameters such as rejection rate and evolutionary rate that are e...