The objective of this program is to develop the knowledge and technology necessary to take full advantage of the unidirectional attenuative properties of ferrites in achieving improved gain and bandwidth in crossed-field microwave amplifiers and oscillators. During this fourth quarterly period, activities included further cold testing of ferrite materials in the L-band cold test vehicle and in ...

In thermoelectric (TE) generators, maximizing the efficiency of conversion of direct heat to electricity requires the reduction of any thermal and electrical contact resistances between the TE legs and the metallic contacts. This requirement is especially challenging in the development of intermediate to high-temperature TE generators. PbTe-based TE materials are known to be highly efficient up...

BACKGROUND Metals are present in electronic cigarette (EC) fluid and aerosol and may present health risks to users. OBJECTIVE The objective of this study was to measure the amounts of tin, copper, zinc, silver, nickel and chromium in the aerosol from four brands of EC and to identify the sources of these metals by examining the elemental composition of the atomizer components. METHODS Four ...

The realization of bimetallic structures is one the major challenges manufacturing industry, to this aim different technologies are employed, among these vacuum brazing presents some advantages: technology, in fact, relatively easy use and relative low temperature process time avoid formation brittle intermetallics thermally affected zones. An application technology regenerative thrust chamber ...

The International Thermonuclear Experiment Reactor (ITER) Thermal shield (TS) serves as a cryogenic heat exchanger to maintain the thermal stability of ITER superconducting magnet coil, which is critical control plasma during operation device. TS composed long-length 316L stainless steel (SS) and copper brazed joints. In this case, feasible fabrication design for CCS presented, accomplished by ...