Idaho Research Foundation, Inc.

Other

Patrick R Taylor

J Craig Oxford

D Michael Shields

Yang-Ki Hong

Hong Sik Jung

Shahid A Pirzada

Robert W Bartlett

Jonathan P Vanderloop

Matthew A Omofoma

Masud Abdel-Latif

A method for dynamically adjusting the spectral content of an audio signal, which increases the harmonic content of said audio signal, said method comprising translating an encoded digital signal into data bands, creating a psychoacoustic model to identify sections of said data bands that are deficient in harmonic quality, analyzing the fundamental frequency and amplitude of said harmonically deficient data bands, creating additional higher order harmonics for said harmonically deficient data bands, adding said higher order harmonics back to said encoded digital signal to form a newly enhanced signal, inverse filtering said newly enhanced signal, and converting said inverse filtered signal to an analog waveform for consumption by the listener.

Method for dynamically adjusting the spectral content of an audio signal

Substantially spherical magneto-plumbite ferrite (barium or strontium ferrite) particles are formed from well-dispersed ultra-fine substantially spherical iron-based oxide and/or hydroxide particles as precursor particles. The precursor particles are mixed with a colloidal barium or strontium carbonate (BaCO or SrCO ), and with small amounts of a byproduct, such as sodium or potassium chloride (NaCl or KCl) or hydroxide (NaOH or KOH) or nitrate (NaNO or KNO ), functioning as a flux to lower the calcination temperature. The particles are filtered out of the mixture, dried, and calcined for a time sufficiently long and/or at a temperature sufficiently high to form magneto-plumbite ferrite from the precursor particles, and for a time sufficiently short and/or a temperature sufficiently low to maintain the general spherical shape of the precursor particles. The particles are used for forming a magnetic recording media by dispersing the particles in a magnetic paint and coating the paint onto a substrate, or by dispersing the particles in a self-supporting material.

Media employing substantially spherical magneto-plumbite ferrite particles

Substantially spherical magneto-plumbite ferrite (barium or strontium ferrite) particles are formed from well-dispersed ultra-fine substantially spherical iron-based oxide and/or hydroxide particles as precursor particles. The precursor particles are mixed with a colloidal barium or strontium carbonate (BaCO,or SrCO,), and with small amounts of a byproduct, such as sodium or potassium chloride (NaCl or KCl) or hydroxide (NaOH or KOH) or nitrate (NaNO,or KNO,), functioning as a flux to lower the calcination temperature. The particles are filtered out of the mixture, dried, and calcined for a time sufficiently long and/or at a temperature sufficiently high to form magneto-plumbite ferrite from the precursor particles, and for a time sufficiently short and/or a temperature sufficiently low to maintain the general spherical shape of the precursor particles. The particles are used for forming a magnetic recording media by dispersing the particles in a magnetic paint and coating the paint onto a substrate, or by dispersing the particles in a self-supporting material.

Method of producing substantially spherical magneto-plumbite ferrite particles

An apparatus and method for the synthesis of ultra-free (submicron) ceramic carbides in a thermal plasma torch reactor using primarily silica, boron oxide, titanium dioxide or other oxides as metal sources and methane as a reductant. A plasma torch operated with both argon and helium as plasma gases and having methane as a primary carrier gas is connected to the plasma reactor for providing the heat necessary to carry out the reaction. A collection chamber with both interior and exterior cooling is connected to the reactor for quenching of the reactants. Cooling is provided to the torch, the reactor and the collection using coils, baffles and jackets.

Plasma production of ultra-fine ceramic carbides

A closed-cover hot cyclone reactor is used to melt and partially reduce particulate iron or ferro-alloy ores fed to it in a stream. Tangential streams of fuel gas or, preferably, producer gas supplied by an associated bath smelter, interact with the spiralling particles as they pass through the reactor. The molten metal travels downwardly along the reactor walls and can be discharged by gravity onto the receiving bath. The system eliminates the need for pelletizing ore and coking coal in smelting of iron products.

Partial reduction of particulate iron ores and cyclone reactor

Disclosed is a process for beneficiating chromite ore. The process can also be used to remove SO.sub.2 from SO.sub.2 -air mixtures which would ordinarily be vented. The chromite ore is pulverized and preferably mixed with sodium sulfate. Ammonium carbonate can also be added for subsequent vaporization to increase porosity. Sulphur oxide-oxygen roasting of the chromite ore is conducted at elevated temperatures in the approximate range between 300.degree. and 1,000.degree. C. or higher at approximately atmospheric pressures. After roasting, the ore is preferably leached using an aqueous ferric sulfate solution to remove soluble undesired constituents from the roasted chromite ore. The beneficiated chromite ore shows improved chromium concentrations and chromium to iron ratios when compared to the original ore.

Chromite ore beneficiation

Cobalt is separated from a cobalt arsenic sulfide ore or concentrate by means of leaching at substantially atmospheric pressure with a ferric sulfate-sulfuric acid solution.

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Moscow, ID, United States of America

Patrick R Taylor