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Functional gradient materials (FGMs) have a microstructurally graded transition in composition (e.g. zirconia to a nickel based superalloy). The graded transition eliminates problems associated with a discrete interface such as poor mechanical strength and transport losses. They are being actively pursued by the engineering community, particularly in Japan, as a means of taking advantage of two di ...

This Phase I project has two primary objectives. The first objective is to evaluate the feasibility of a fully ion implanted fabrication process based on the heterodimensional 2-D MESFET. The new device, the 2-D JFET, will have p+ ion implanted sidegates which laterally modulate a thin, highly doped n-type conducting channel. The 2-D JFET should have excellent high speed, low power characteristics ...

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IT IS PROPOSED THAT ADVANCED ARCJET ENGINES CAN BE DEVELOPED USING KNOWN PRINCIPLES FOR ADVANCED NOZZLE DESIGN, ARC ATTACHMENT, INCREASED CHAMBER EFFECTIVE TEMPERATURE AND SO FORTH. SUCH STUDIES ARE PARTIALLY SUPPORTED BY EXPERIMENTAL RESULTS BY RESEARCHERS IN THE RUSSIAN FEDERATION. YET THESE PRINCIPLES RESULT IN INCREASED HEATING OF THE ANODE, AS THE ARC MORE EFFECTIVELY HEATS THE ANODE. THIS CA ...

BIMODAL REACTORS FOR POWER AND PROPULSION HAVE LONG BEEN OF INTEREST FOR MISSIONS REQUIRINGS BOTH HIGH POWER AND LARGE DELTA-V; E.G., HIGH ALTITUDE, GEOSYNCHRONOUS AND PLANETARY MISSIONS. IT PROPULSIVE THRUST AND ELECTRIC POWER CAN BOTH BE SUPPLIED FROM THE SAME UNIT, A LARGE POTENTIAL SAVINGS CAN OCCUR. SUCH A REACTOR CAN BE DEVELOPED FROM A URANIUM CARBIDE FUELED THERMIONIC REACTOR WITH SINGLE C ...

Phase I proposes to demonstrate an easy-to-operate, inexpensive room temperature neutron detector based on boron-doped diamond. The detector would produce an immediate signal related to low-level neutron irradiation. The concept exploits the high neutron absorption cross section of B-10, which results in excellent sensitivity. The charge carriers generated in the diamond by a neutron absorption ev ...

Unexpected coupling between nuclear reaction cross sections and the solid state of metal deuterides has been demonstrated in layered Pd-PdO deuterided structures. As a result, high rates of charged particle and neutron measurements have been observed through a reaction initiated by altering the chemical state of the system. Moreover, the system acts as an amplifier of fast neutrons, with a 200-to- ...

The development of a microwave curing method for resin matrix composites and jointing/bonding epoxy is proposed. This technique will take advantage of the ability of vapor-grown carbon fiber (VGCF) to absorb microwave energy with high efficiency. By adding VGCF to resin matrix composite material and epoxy, we hope that the materials can be processed by microwave irradiation in a manner that result ...

properties: Intramolecular and intermolecular charge transfers in phthalocyanine molecules can be used as signal generators for information processing and storage; phthalocyanine molecules show an excellent molecular stability resistant to environmental changes and harsh conditions, high thermal stability up to 280¿ C in normal environment and up to 700-800¿ C in vacuum, resistive to B and most ...

A THEORETICAL PROGRAM IS PROPOSED TO INVESTIGATE A COMPACT, LOW-VOLTAGE INFRARED GRATING LASER WITH MULTI-KILOWATT OUPUT CAPABILITY. THE RADIATION IS GENERATED BY THE PASSAGE OF AN ANNULAR BEAM OF ELECTRONS THROUGH A COAXIAL PAIR OF CONDUCTORS, THE INNER CONDUCTOR BEING A CORRUGATED CYLINDER WHICH FORMS THE GRATING. THE ELECTRON BEAM IS GUIDED BY AN AXIAL MAGNETIC FIELD. THE DIMENSIONS OF THE OPTI ...