Keyword: Particulate matter (PM)

Briefs: Physical Sciences
Particle-Image Velocimeter Having Large Depth of Field

An instrument that functions mainly as a particle-image velocimeter provides data on the sizes and velocities of flying opaque particles. The instrument is being developed as a means of characterizing fluxes of wind-borne dust particles in the Martian atmosphere. The instrument could also...

Briefs: Physical Sciences

An alternative design concept for nuclear thermal rocket engines for interplanetary spacecraft calls for the use of grooved-ring fuel elements. Beyond spacecraft rocket engines, this...

Briefs: Physical Sciences

Microleaks for inlets of mass spectrometers used to analyze atmospheric gases can be fabricated in silicon wafers by means of photolithography, etching, and other techniques that are...

Briefs: Manufacturing & Prototyping

A method of (1) sealing a sample of material acquired in a possibly biologically contaminated (“dirty”) environment into a hermetic container, (2) sterilizing the outer surface of...

Briefs: Manufacturing & Prototyping
System for Removing Pollutants From Incinerator Exhaust

A system for removing pollutants — primarily sulfur dioxide and mixed oxides of nitrogen (NOx) — from incinerator exhaust has been demonstrated. The system is also designed secondarily to remove particles, hydrocarbons, and CO. The system is intended for use in an enclosed...

Briefs: Materials
Oxide Fiber Cathode Materials for Rechargeable Lithium Cells

LiCoO2 and LiNiO2 fibers have been investigated as alternatives to LiCoO2 and LiNiO2 powders used as lithium-intercalation compounds in cathodes of rechargeable lithium-ion electrochemical cells. In making such a cathode, LiCoO2 or...

Briefs: Green Design & Manufacturing
Oxide Fiber Cathode Materials for Rechargeable Lithium Cells

Fibers have been investigated at Johnson Space Center as alternatives to other powders used as lithium-intercalation compounds in cathodes of rechargeable lithium-ion electrochemical cells. The fibers can be pressed and sintered to form a cathode, without need for a binder or a...

Briefs: Green Design & Manufacturing
System for Removing Pollutants From Incinerator Exhaust

A system for removing pollutants — primarily sulfur dioxide and mixed oxides of nitrogen (NOx) — from incinerator exhaust has been demonstrated. The system is also designed secondarily to remove particles, hydrocarbons, and CO. The system is intended for use in an enclosed...

Briefs: Mechanical & Fluid Systems

An apparatus is being developed for sampling water for signs of microbial life in an ocean hydrothermal vent at a depth of as much as 6.5 km. Heretofore, evidence of microbial life in deep-sea hydrothermal...

Briefs: Physical Sciences

A method of using ellipsometry or polarization analysis of light in total internal reflection of a surface to determine the number density of gold nanoparticles on a smooth...

Briefs: Physical Sciences
Gold Nanoparticle Labels Amplify Ellipsometric Signals

The ellipsometric method reported in the immediately preceding article was developed in conjunction with a method of using gold nanoparticles as labels on biomolecules that one seeks to detect. The purpose of the labeling is to exploit the optical properties of the gold nanoparticles in...

Briefs: Materials

Nano-engineered catalysts, and a method of fabricating them, have been developed in a continuing effort to improve the performances of direct methanol fuel cells as candidate power...

Briefs: Materials

Capillography (from the Latin capillus, “hair”, and the Greek graphein, “to write”) is a recently conceived technique for forming mats of nanofibers into useful patterns. The concept was inspired...

Briefs: Mechanical & Fluid Systems

The figure presents a cross-sectional view of a supercharged, variable-compression, two-cycle, internal-combustion engine that offers significant advantages over prior such engines. The improvements...

Briefs: Medical
UV-Resistant Non-Spore-Forming Bacteria From Spacecraft-Assembly Facilities

Four species of non-spore-forming bacteria collected from clean-room surfaces in spacecraft-assembly facilities could survive doses of ultraviolet (UV) radiation that would suffice to kill most known cultivable bacterial species. In a previous study, high UV resistance...

Application Briefs: Aerospace
STEREO observatories and Solar Probe
Johns Hopkins University Applied Physics Laboratory
Laurel, MD
240-228-5000
www.jhuapl.edu

NASA’s Solar Terrestrial Relations Observatory...

Briefs: Physical Sciences

An instrument for rapidly measuring the electric charges and sizes (from ≈1 to ≈100 μm) of airborne particles is undergoing development. Conceived for monitoring atmospheric dust particles on Mars,...

Briefs: Electronics & Computers

Electronic sensor systems for detecting and locating impacts of rapidly moving particles on spacecraft have been invented. Systems of this type could also be useful on Earth in settings in which the occurrence of...

Application Briefs: Medical
Laboratory for Global Health Observation
University of Alabama at Birmingham, School
of Public Health
Birmingham, AL
205-934-4993
...
Briefs: Manufacturing & Prototyping

An improved method of filling a molding flask with sand and compacting the sand around a refractory- coated foam mold pattern has been developed for incorporation into the lost-foam...

Briefs: Medical

The laboratory apparatus shown in the figure is a chamber for aerosol deposition of bioparticles on surfaces of test coupons. It is designed for primary use in inoculating both flat and...

Briefs: Information Technology
Symmetric Phase-Only Filtering in Particle-Image Velocimetry

Symmetrical phase-only filtering (SPOF) can be exploited to obtain substantial improvements in the results of data processing in particle- image velocimetry (PIV). In comparison with traditional PIV data processing, SPOF PIV data processing yields narrower and larger amplitude...

Briefs: Medical

The hydrocyclone- filtration extractor (HFE), now undergoing development, is a simple, robust apparatus for processing large amounts of soil to extract trace amounts of...

Articles: Manufacturing & Prototyping
Litroenergy™, a New Light Source Material Steve Stark
MPK Co.
Champlin, MN

A patent-pending light source material, Litroenergy™ contains self-luminous micro...

Briefs: Materials

Work output is comparable to conventional SMA alloys but with transition temperatures significantly exceeding those of conventional materials.

Compositions and production processes have...

Briefs: Physical Sciences

A mathematical model of image artifacts produced by dust particles on lenses has been derived. Machinevision systems often have to work with camera lenses that become dusty during use. Dust...

Briefs: Physical Sciences

Nanostructured devices that exploit the hybrid-polariton resonances arising from coupling among photons, phonons, and plasmons are subjects of research directed toward the development of...

Briefs: Information Technology
Scheme for Quantum Computing Immune to Decoherence

A constructive scheme has been devised to enable mapping of any quantum computation into a spintronic circuit in which the computation is encoded in a basis that is, in principle, immune to quantum decoherence. The scheme is implemented by an algorithm that utilizes multiple physical spins to...

Briefs: Physical Sciences

The uncertainty in the frequency of a linear- ion-trap frequency standard (LITS) can be reduced substantially by use of a very small magnetic inhomogeneity tailored to compensate...