Elektrodenkinetische Untersuchungen zum Siliciumdurchtritt an der Phasengrenze zwischen einer kieselsäurehaltigen Oxidschmelze und einer siliciumhaltigen Metallschmelze

Bedeutung elektrochemischer Untersuchungen von Reaktionen zwischen flüssigen Metallen und Schlacken. Aufbau einer galvanischen Kette, deren Bruttoreaktion der Bildung von SiO₂ entspricht. Anwendung der galvanostatischen Impulsmethode zur Ermittlung der Abhängigkeit der Stromdichte von der Durchtrittsüberspannung und der Austauschstromdichte beim Siliciumdurchtritt an der Phasengrenze Metallschmelze/Oxidschmelze. Ergänzende Messungen der EMK und der Stromausbeuten in bezug auf elektrolytisch entwickelten Sauerstoff.     

A hexahedral mesh connectivity compression with vertex degrees

This paper introduces a new algorithm for the compression of manifold hexahedral meshes topology, using vertex degree. The topology compression consists of two parts—the mesh’s boundary consisting of quadrilaterals is compressed first, and then the hexahedra are processed by the help of six commands. The topology compression algorithm has been matched against the best-known method to-date, and shows itself to be competitive.     

Robotic Assembly System in Semiconductor Industry

A sensor-based robotic production system for assembly of rectifier bridges is described. Assembly tasks in semiconductor industry require a robot with good positional accuracy having the capability of high velocities and accelerations in all degrees of freedom. An important part of the semiconductor production is to measure the diode properties. The trajectory of the manipulator end-effector is determined by the results from these measurements. A vaccum gripper with an air flow sensor is also used in this particular task. The robotic language DARL was used to control the assembly process.     

Compressed vertex chain codes

This paper introduces three new vertex chain codes. Firstly, considering that the vertex chain code uses 2 bits to represent only three code elements, a new code is introduced without increasing the average bits per code. The second case introduces a variable-length vertex chain code. Finally, a new compressed chain code is proposed based on the Huffman method. The continuation introduces a method for quantificationally evaluating the efficiency of chain codes. The efficiencies of the new vertex chain codes are then compared theoretically and practically against the most popular chain codes. The result of the comparison shows that the new compressed chain code is the most efficient.     

Orientation dependent surface segregation of antimony on non-oriented electrical steel sheet

The surface segregation of antimony was studied using AES on a 1.8% Si steel alloyed with different mass contents of Sb (0.052 and 0.1%). The dependency of surface segregation on grain orientation and on the presence of other solute atoms (S. P. C, Al. Si) were investigated under UHV conditions in the temperature range from 450 to 900 °C. The results lead to an explanation for the formation of a texture rich in (100)-grains in Si steel caused by the presence of Sb. Also grain boundaries were analysed by AES after annealing at 850, 700 and 550 °C for different times. Since the grain boundary segregation was negligible one can conclude that the texture formation results from orientation dependent surface segregation of Sb causing differences in surface energies and stabilities of different grains.