Interaction of strontium oxide with Sr-Cl<Subscript>2</Subscript>-<Emphasis Type="Italic">M</Emphasis>Cl melts

The kinetics of dissolution and the solubility of strontium oxide in melts of KCl, NaCl, CsCl, (3Li-2K)C_leut (eutectic), and LiCl containing 5, 7, and 12 mol % SrCl₂ at 973–1073 K are determined by the isothermal saturation method. The diffusion coefficients of strontium ions in these salt systems are estimated.     

Thoracic and lumbar myelography with metrizamid (author's transl)

With the new x-ray medium Metrizamid it is possible to perform almost complication-free lumbar and thoracic myelography. In an experience the type of complications arising were reduced to moderate headaches, mild nausea occasional dissiness. No convulsions were seen. The number of complications are less than with other watersoluble contrast medium.     

Transition metals supported on oxides: density functional cluster studies of palladium deposition on MgO(001)

The interaction of isolated Pd atoms and of a square Pd₄ cluster with the (001) surface of MgO is investigated by means of density functional (DF) calculations. The oxide surface is represented by various model clusters and the effect of the surrounding is taken into account by embedding the cluster in point charges and total ion model potentials. The calculations are performed at the relativistic level using the Becke–Perdew exchange-correlation functional. The adsorption properties determined with this computational scheme are compared with other DF results. The bonding of the Pd atoms and clusters with the surface is analyzed in terms of charge density difference plots. It is found that the polarization of the metal adsorbate due to the surface electric field provides an important contribution to the metal–oxide adhesion energy. This revised version was published online in June 2006 with corrections to the Cover Date.     

Applied kinetics of styrene suspension polymerization

In order to describe the kinetics of styrene suspension polymerization, it was proposed to apply the concept of the organized space of experiment formed by the results of kinetic experiments at different combinations of initial conditions, the properties of which can be determined using factor analysis. For this purpose, a 5 × 5 matrix of experiments performed at five temperatures and five initiator concentrations was implemented. Using the reduction of the obtained curves to the unified dimensionless time scale and performing the merge and ordering operation on the curves, it was shown that the introduction of seven empirical parameters was sufficient for the complete characterization of the entire space. A semi-empirical dependence of the monomer conversion on the dimensionless time was obtained; it was adequate to the experiment.     

Reactor Dynamics of Suspension Polymerization of Styrene

Theoretical Foundations of Chemical Engineering - The reactor dynamics of suspension polymerization of styrene has been studied in a specially designed unit controlled by a computer. It is found...     

Developing an Adaptive Supervisor Controller for a Control System for a Radical Polymerization Reactor

Theoretical Foundations of Chemical Engineering - This paper is devoted to solving the problem of controlling complex chemical engineering processes using the example of radical polymerization....     

In sweet harmony or in bitter discord? How cultural values and stakeholder requirements shape and users read an urban computing technology

AI & SOCIETY - Culture is, in many ways, implicated in and shapes technology design and use. Inspired by Stuart Hall’s conception of encoding/decoding, we maintain that technological...     

Study and Analysis of the Change in the Viscosity of a Reaction Mixture during the Suspension Polymerization of Styrene

Theoretical Foundations of Chemical Engineering - The change in the viscosity of a reaction mixture in the process of polystyrene synthesis and the possibility of controlling it in the course of...