Keyword: Vacuum

Briefs: Physical Sciences

Miniature ring-orbitron getter ion pumps have been proposed for supplying high vacuums to advanced scientific instruments expected to be developed in the next few years. Examples of such...

Briefs: Robotics, Automation & Control

A laboratory apparatus called a "vacuum damper investigation and performance evaluation robot" ("V-DIAPER") affords capabilities for vacuum dynamic testing of torsional dampers. The apparatus...

Briefs: Photonics/Optics

There are a number of important OEM photonic applications based on the detection of low incident light levels, including flow cytometry, PET (positron emission tomography) imaging,...

Briefs: Materials

Doping with silver bromide has been found to be an effective technique for enhancing the optical homogeneity and other qualities of single crystals of lead bromide. These crystals are grown...

Briefs: Materials

Materials based on β-Zn4Sb3have been found to exhibit unusually high values of the dimensionless thermoelectric figure of merit at temperatures between 200...

Briefs: Physical Sciences
Electrostrictive Thermal Break Between Superfluid Reservoirs

A proposed technique would make it possible to maintain two reservoirs of superfluid helium at the same pressure but at different temperatures. Heretofore, a fountain effect (described below) has made this impossible. The proposed technique could be useful for low-temperature...

Briefs: Mechanical & Fluid Systems

Acoustic-radiation pressure can be used to improve performance in the dispensing of liquid drops into gases or vacuum and in dispensing gas bubbles into liquids. In a typical application...

Briefs: Test & Measurement
Noncontact Measurement of Resistivity of Molten Material

It is now possible to determine the electrical resistivity of a molten sample of a pure, electrically conductive material (a metal or semiconductor), without contact between the sample or any solid object. Once the electrical resistivity has been determined, the thermal conductivity can...

Briefs: Manufacturing & Prototyping

Vacuum plasma spraying (VPS) has been demonstrated to be an effective technique for the fabrication of refractory-metal components of solar-thermal engines. Heretofore, such...

Briefs: Robotics, Automation & Control

A three-ball tribometer has been developed for use in evaluating the performances of oils and greases as lubricants in a vacuum at room temperature. This apparatus differs from the...

Briefs: Electronics & Computers

A single-block fixture enables the rapid and accurate electrical characterization of planar microwave electronic components, by use of the through-reflect-line (TRL) technique, in...

Briefs: Electronics & Computers
Delta-Doped CCDs for Measuring Energies of Positive Ions

Research closely related to that reported in the preceding article has shown that δ-doped charge-coupled devices (CCDs) could be used to detect incident protons and perhaps other positive ions, and to measure the kinetic energies of the ions, down to about 1.25 keV. Prior to the...

Briefs: Materials

Ion-beam-deposited surface layers of diamond-like carbon (DLC) on fine-grain chemical-vapor-deposited (CVD) diamond have been found to be effective in reducing friction and wear in a...

Briefs: Electronics & Computers

Charge-coupled devices (CCDs) of a type developed previously for imaging in ultraviolet light have been found to be useful as detectors of electrons and other charged particles with kinetic...

Briefs: Manufacturing & Prototyping

The figure illustrates selected aspects of a manually actuated apparatus for use in coating two small objects with suitable metals, then forcing the two objects together at the coated flat...

Briefs: Electronics & Computers
Plasma Window Technology for Propagating Particle Beams and Radiation from Vacuum to Atmosphere

Plasma windows can separate vacuum and atmosphere, or regions of high and low vacuums, in a way which facilitates transmission of various particle beams and/or radiation from low- to high-pressure regions. In a prototype device, a stabilized plasma...

Briefs: Electronics & Computers

A substrate of nickel coated with a thin layer of silver and further coated with a thin protective layer of silicon dioxide has been found to constitute an optically reflective...

Briefs: Physical Sciences

A sonochemical treatment has been proposed for removing hydrazine contaminants from water. The basis of the proposal is a conjecture that the sonochemical effect in water containing...

Briefs: Electronics & Computers

Microbridges that constitute the superconducting-transition sensory elements of electron-diffusion-cooled hot-electron bolometers can now be fabricated in increased yield and...

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