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Dual sample cavities are described in which the standard sample sees both the primary modulation field and also an opposing secondary modulation field from a very small adjacent compensation coil. Both primary and secondary fields are at the same modulation frequency. The geometry permits...
An image‐reduction method utilizing asymmetric Bragg reflection is demonstrated by 9.5‐fold and 22.6‐fold one‐dimensional reductions of a 30 cell/mm gold mesh having a web width of 8μm. Applicability of the method to microphotolithography is suggested.
A new method for the rapid investigation of sedimentation phenomena of fine particles is developed by using the force due to a vibrational acceleration. The small displacement of the particle with respect to the wall of the container, which is produced by the vibration, is measured by the...
An apparatus is decribed which has been used to determine the shear modulus of cylindrical specimens vibrating in the torsional mode. The specimens are maintained in self‐excited vibration by an eddy‐current driver, an eddy‐current pickup, and a feed back circuit consisting of a...
Excellent pulse height and pulse shape discrimination performance has been obtained for liquid scintillators containing as much as 10 wt.% 6 Li‐salicylate dissolved in a toluene‐methanol solvent system using naphthalene and 9,10 diphenylanthracene as intermediate and secondary solutes. This...
A wide variety of dissolved chemicals can be measured continuously with some specificity by directly interfacing a relatively inexpensive mass spectrometer to a solution. Specifically, we describe the construction and initial use of a membrane interace to a mass spectrometer which allows the...
The design, construction, and performance of a 100‐MHz noise spectrometer are described. Basically a 100‐MHz bridge, this system uses the properties of a double balanced mixer to enable the experimenter to determine spectral densities of fluctuations in the real or imaginary parts of a sample...
The design of a small compact pulsed blowdown apparatus coupled to a cold cathode electron gun is described. This system allows the excitation of a gas mixture in supersonic flow at temperatures of 80 and 120 K and density of 1 amagat with a maximum electron beam current density of 20 A cm −2...
We describe a very simple and inexpensive interferometer setup which provides high accuracy measurements of the refractive index ( n ) of liquids with temperature. A standard deviation σ ( n ) =5.4×10 −7 has been observed in isooctane liquid when fitting n to a linear temperature variation.
An improved 10 B‐loaded liquid scintillator solution has been developed containing trimethylborate, 1‐methylnaphthalene, and 9,10‐diphenylanthracene. Cells up to 5 cm in diameter by 15.2 cm long have been prepared and tested with 10 B‐loadings up to 7.2% by weight (80% trimethylborate)....
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