45 research outputs found
A comparison of electrochemical degradation of phenol on boron doped diamond and lead dioxide anodes
This work compares two electrode materials used to mineralize phenol contained in waste waters. Two disks covered with either boron doped diamond (BDD) or PbO2 were used as anodes in a one compartment flow cell under the same hydrodynamic conditions. Efficiencies of galvanostatic electrolyses are compared on the basis of measurements of Total Organic Carbon (TOC) and Chemical Oxygen Demand (COD). Galvanostatic electrolyses were monitored by analysis of phenol and of its oxidation derivatives to evaluate the operating time needed for complete elimination of toxic aromatics. The experimental current efficiency is close to the theoretical value for the BDD electrode. Other parameters being equal, phenol species disappeared at the same rate using the two electrode materials but the BDD anode showed better efficiency to eliminate TOC and COD. Moreover, during the electrolysis less intermediates are formed with BDD compared to PbO2 whatever the current density. A comparison of energy consumption is given based on the criterion of 99% removal of aromatic compounds
GATS and the steering capacity of a nation state in higher education: case studies of the Czech Republic and the Netherlands
Traction transformer 1 MV.A, superconducting, oil-immersed and medium frequency
This paper deals with comparing 3 types of transformers - superconducting, oil-immersed and middle-frequency.
These transformers can be used for locomotive as the main transformer. Weight, sizes and losses are introduced. The
influence of eddy currents is describes by middle-frequency transformer. The article deals with magnetic properties of
materials for higher frequency
Release of Acetylcholine by the Isolated Rat Heart Atria and its Influence on Regulation of Contractility by Rhythm
Forme de la relation contractilité-fréquence du myocarde auriculaire du hamster, comparée a celle du cobaye et du rat
Supplementary Material for: Prenatal Diagnosis of Congenital Epulis by 2D/3D Ultrasound and Magnetic Resonance
Congenital epulis is a rare benign oral cavity tumor that usually arises from the maxillary alveolar mucosa. It is also known as congenital gingival granular cell tumor. Prenatal diagnosis is uncommon and mostly confined to the third trimester. We report a case of congenital epulis, which was referred to our department at 35 weeks of gestation. Both images from our prenatal 2D/3D ultrasound (including Doppler technique) and magnetic resonance examination are presented. A baby girl weighing 2,800 g was delivered spontaneously at 36 weeks and 1 day. The newborn had to be intubated immediately after delivery. A simple excision of the mass was performed on the first day of neonatal life after clinical examination by our pediatric stomatologists confirmed the presence of a tumor resembling epulis. The correctness of this diagnosis was subsequently confirmed by histogenesis. Photographs from the operating room show the postnatal appearance of the tumor. The baby was discharged at the age of 19 days and has remained well at follow-up controls