Time filter

Source Type

Felea C.I.,Technical University Gheorghe Asachi | Ursache M.,Technical University Gheorghe Asachi | Hnatiuc E.,Technical University Gheorghe Asachi | Chirita M.,University Of Medicine And Pharmacy Gr pa Of Iasi
2014 International Conference on Optimization of Electrical and Electronic Equipment, OPTIM 2014 | Year: 2014

Gas injection using simple and double crossing method through active discharge area of an electrochemical reactor GlidArc type has been used during experiments. This proposal could be a prerequisite for improvements of reactors efficiency with cold plasma discharges. New proposed solutions of gas injection are used to compare methods efficiency. Bio decontamination effects during experiments have been confirmed using a GlidArc reactor with circular symmetry at simple and double crossing method of gas injection. Experiments have been performed under ambient environment. © 2014 IEEE. Source

Hritcu D.,Technical University Gheorghe Asachi | Lupu-Poliac M.,Technical University Gheorghe Asachi | Hatmanu M.,Technical University Gheorghe Asachi | Baciu E.-R.,University Of Medicine And Pharmacy Gr pa Of Iasi | And 2 more authors.
Key Engineering Materials | Year: 2015

Discovered in 1930, metal processing by electrolysis processes in aqueous solutions, are being intensely studied starting with 1960, so that now they have a wide diversity and industrial applicability. The present paper illustrates some theoretical considerations regarding specific electrode processes of the aqueous solutions electrolysis and the I=f(U) characteristics of the Me/VGS/E electrochemical system thus establishing the forming conditions of electrolytic plasma (PE). The continuous and stable character of the deposited layer (VGS) and of the shell formed by the electrolytic plasma will contribute to the rapid heating of the metal electrode, under the influence of the three heat flows qa, ql and qs. Plasma electrolytic saturation phenomena (PES) and the formation of oxides on the metal surface (PEO), represent the two main directions of plasma electrolytic deposition (PED). © (2015) Trans Tech Publications, Switzerland. Source

Petrescu H.A.,Polytechnic University of Bucharest | Vlasceanu D.,Polytechnic University of Bucharest | Stamate A.,University of Bucharest | Bololoi R.,Polytechnic University of Bucharest | Hanganu S.C.,University Of Medicine And Pharmacy Gr pa Of Iasi
Key Engineering Materials | Year: 2014

Dental medicine represents a very important part of our life. As our appearance or looks is a major concern for us, a beautiful smile can improve our life. Moreover, our teeth health reflects on our overall health. This paper presents a method for highlighting the differences between a natural tooth and a prosthetic one. In order to determine the stress distribution in teeth during the use of prosthetics pivots, several virtual geometric models of the teeth were created (first molar and second molar), both in their natural form and when using pivots. The results obtained from these analyses were compared in order to reveal the behavior of a prosthetic tooth during normal life loads. Such results of real life behavior can be used by dental medics in order to predict the life span of restored teeth. © (2015) Trans Tech Publications, Switzerland. Source

Kloetzer L.,Technical University Gheorghe Asachi | Galaction A.-I.,University Of Medicine And Pharmacy Gr pa Of Iasi | Cascaval D.,Technical University Gheorghe Asachi
Separation Science and Technology | Year: 2010

p-Aminobenzoic acid has been facilitated pertracted with Amberlite LA-2 dissolved in dichloromethane, using a U-shaped pertraction cell which allows obtaining the free liquid membrane. The pertraction has been a carrier out in the presence of 1-octanol added in the liquid membrane. The addition of the alcohol led to the increase for up to 3 times of the acid initial and final mass flows, this effect being directly related to the process variables (pH-gradient between the aqueous phases, carrier and alcohol concentrations inside the membrane phase, mixing intensity). But, the influence of 1-octanol on the transport capacity of the pertraction system was negative, its addition inducing the accumulation of PABA in the liquid membrane, and requiring the reevaluation and optimization of the acid reextraction from the membrane phase to the stripping one. © Taylor & Francis Group, LLC. Source

Cascaval D.,Technical University Gheorghe Asachi | Galaction A.-I.,University Of Medicine And Pharmacy Gr pa Of Iasi | Camarut S.,Technical University Gheorghe Asachi
Chemical and Biochemical Engineering Quarterly | Year: 2011

The paper is dedicated to the analysis of the scale-up of an aerobic stirred bioreactor from 4 L working volume to 40 L using the mixing time criterion, taking into account its required conditions and effects. Therefore, if the selected operating parameters allow obtaining similar values of mixing time in the larger bioreactor as in the reference one, it is possible to maintain also the specific power consumption by scaling-up. However, the shear forces in the larger bioreactor are amplified with 23-35 %, the most important increase being recorded for high viscous broths. Source

Discover hidden collaborations