Positive electrodes of nickel-cadmium batteries

Ni hydroxide sintered electrodes which are filled electrochemically are superior to chemically treated electrodes. In the electrochemical process, the hydroxide grows on the Ni grains and possesses a well-defined porous structure. Diffusion and conducting mechanisms are therefore facilitated

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

Analyses using VR/AR visualization

Chemnitz University of Technology's Institute for Machine Tools and Production Processes has developed new visualization methods for studying finite elements analysis (FEA) results in immersive environments along with a mobile augmented reality system. Their aim is to visualize the direction and gradient of stress using 3D glyphs. These methods allow component characteristics to be studied in the machine environment during the development process and merges results from structural and thermal analyses into one application, resulting in a more efficient and informative process of analysis. the stereoscopic visualization methods and glyph-based displays also support human perception and improve comprehension of complete data. Other benefits also include: interactive scaling of displacement vectors, provision of both structural and thermal analysis findings in one application, and data preparation

Entwicklung eines Verfahrens zur Oxidation schwer abbaubarer Cyanokomplexe Abschlussbericht

SIGLEAvailable from TIB Hannover: F02B540 / FIZ - Fachinformationszzentrum Karlsruhe / TIB - Technische InformationsbibliothekDeutsche Bundesstiftung Umwelt, Osnabrueck (Germany)DEGerman

Entwicklung und Untersuchung eines Verfahrens zur elektrochemischen Aufbereitung von Abwasser

Copy held by FIZ Karlsruhe; available from UB/TIB Hannover / FIZ - Fachinformationszzentrum Karlsruhe / TIB - Technische InformationsbibliothekSIGLEDEGerman

Weiterentwicklung und Optimierung einfacher Oxidationsverfahren zur Aufbereitung organisch belasteter Grund- und Trinkwaesser in den NBL. Teilprojekt A-C Abschlussbericht

At present the use of Advanced Oxidation Processes (AOP) in drinking-water treatment plants is largely investigated. An important point of interest is the metabolism of the degraded substances, to avoid the formation of toxic byproducts. Three variants of the AOP-processes were tested in batchreactors, flow-through-reactors and in a pilot plant (UV/H2O2). Batchreactors were used to determine various reaction parameters. Flow-through reactors were used for testing UV-lamps and for the comparison of the single AOPs. The pilot-plant for the UV/H2O2-process was optimised at a contaminated well. Metabolites were analysed by HPLC, CG/MS and capillary electrophoresis. Detailed degradation pathways of atrazine and isoproturone were obtained. The comparison of the processes showed as a result of the project that each one yields a sufficient degradation of the micropollutant. For the ozone/H2O2-variant the lowest amount of energie was needed. The examinations proved the reliability of AOPs for purification of polluted ground-, drinking-, and surfacewater from micropollutants. As-up-scaling of the ozone/H2O2-process for waterworks should be possible. (orig.)Available from TIB Hannover: F98B1304+a / FIZ - Fachinformationszzentrum Karlsruhe / TIB - Technische InformationsbibliothekSIGLEBundesministerium fuer Bildung, Wissenschaft, Forschung und Technologie, Bonn (Germany)DEGerman