Many test handlers process semiconductor devices in trays which must be rapidly heated or cooled by a forced air flow to a desired test temperature and then back to ambient temperature. This paper describes a new design feature for testhandler tray that significantly increases the rate of convective heat transfer to the tray and the devices in the tray. The improved tray incorporates lateral ri...

Sieve trays are widely used in the gas- liquid contactors such as distillation and absorption towers. In this article, a three-dimensional, two phase CFD model using Euler-Euler framework was developed to simulate a distillation tower with two sieve trays. Hydrodynamic simulation of air and water system in different rates of gas phase was carried out and velocity distribution parameters, clear ...

We argue that intelligible appeals to interlevel causes (top-down and bottom-up) can be understood, without remainder, as appeals to mechanistically mediated effects. Mechanistically mediated effects are hybrids of causal and constitutive relations, where the causal relations are exclusively intralevel. The idea of causation would have to stretch to the breaking point to accommodate interlevel ...

Some of the algorithms for solving the Tower of Hanoi puzzle can be applied “with eyes closed” or “without memory”. Here we survey the solution for the classical tower of Hanoi that uses finite automata, as well as some variations on the original puzzle. In passing, we obtain a new result on morphisms generating the classical and the lazy tower of Hanoi, and a new result on auomatic sequences.

objectives: the purpose of this study was to compare the accuracy of implant position transfer and surface detail reproduction using two impression techniques and materials. materials and methods: a metal model with two implants and three grooves of 0.25, 0.50 and 0.75 mm in depth on the flat superior surface of a die was fabricated. ten regular-body polyether (pe) and 10 regular-body polyvinyl...

OBJECTIVES The purpose of this study was to compare the accuracy of implant position transfer and surface detail reproduction using two impression techniques and materials. MATERIALS AND METHODS A metal model with two implants and three grooves of 0.25, 0.50 and 0.75 mm in depth on the flat superior surface of a die was fabricated. Ten regular-body polyether (PE) and 10 regular-body polyvinyl...

PURPOSE The aim of this in vitro study was to compare the accuracy of two different impression techniques for the All-on-Four implant therapy protocol. MATERIALS AND METHODS An acrylic resin analog for an edentulous maxilla with four internal connection implants (Replace Select, Nobel Biocare) was fabricated according to the All-on-Four protocol. A total of 40 impressions were made with diffe...

The paper proposes the concept and analyses possible application of augmented reality technologies in an airport control tower. Augmented reality overlays computer generated graphics over real objects in the surrounding environment. To explore the applicability of Augmented Reality technology into the airport tower environment we have performed the field study using the video camera mounted on ...