Implementation of a self-controlling heater: A concept

Proposed heater uses its own temperature coefficient for sensing function. Heating power is supplied from current source, heater voltage containing temperature information. Dynamic stability is very high since there is no thermal lag as would exist with separate heater and sensor

A design study of hydrazine and biowaste resistojets

A generalized modeling program was adapted in BASIC on a personal computer to compare the performance of four types of biowaste resistojets and two types of hydrazine augmenters. Analyzed biowaste design types were: (1) an electrically conductive ceramic heater-exchanger of zirconia; (2) a truss heater of platinum in cross flow; (3) an immersed bicoiled tubular heater-exchanger; and (4) a nonexposed, refractory metal, radiant heater in a central cavity within a heat exchanger case. Concepts 2 and 3 are designed to have an efficient, stainless steel outer pressure case. The hydrazine design types are: (5) an immersed bicoil heater exchanger and (6) a nonexposed radiant heater now with a refractory metal case. The ceramic biowaste resistojet has the highest specific impulse growth potential at 2000 K of 192.5 (CO2) and 269 s (H2O). The bicoil produces the highest augmenter temperature of 1994 K for a 2073 K heater giving 317 s at .73 overall efficiency. Detailed temperature profiles of each of the designs are shown. The scaled layout drawings of each are presented with recommended materials and fabrication methods

Do the Prophets Teach That Babylonia Will Be Rebuilt in the Eschaton

Dispensationalists have traditionally argued that Babylon in Revelation 14 and chaps. 17-18 is a symbol indicating some form of reestablished Rome. * In recent days a renewed interest has been shown in the idea that the ancient empire of Babylonia and city of Babylon will be rebuilt.2 This conclusion comes from a reading of the prophets—Isaiah and Jeremiah in particular—in a manner that requires the rebuilding of the city and empire of Babylonia in the eschaton. My approach to this question is from three different perspectives: (1) to study the context of the oracles against the nations (OAN) found in Isaiah 13-23 and, in particular, the way the critical thirteenth chapter fits into the Sitz im Leben of the eighth century during which Isaiah was prophesying; (2) to study the language of destruction found in this same unit and relate it to the treaty curses found in the ancient Near East and to the rest of the OT; and (3) to examine Jeremiah\u27s prophecies against Babylon containing much of the same language as that of Isaiah