Absorbed dose; calorimeter; heat loss compensation; heat flow theorems
A new calorimetric design and measuring technique are proposed for reducing uncertainties caused by temperature gradients. A theoretical analysis reveals a mathematical theorem concerning heat transfer and its electrical analog.
A new type of 3-body calorimeter for measuring absorbed dose produced by ionizing radiation is described in detail. All three bodies rise in temperature during irradiation, and the heat absorbed by the central core is measured by standard means....
Constant loading; force; high precision; high-precision weighing; load cell; mass; mass comparator; mass difference; strain-gage; substitution weighing; weighing; weights.
Described here is a simple mechanical method used to fabricate a high precision mass comparator using a bonded strain gage load cell. Results indicate that a standard deviation of less than 0.0003% is readily attainable, and the device works well...
decomposition; high pressure; high temperature; reactions.
This short note describes an apparatus that has been designed and constructed to allow assessment of the extent of chemical decomposition of fluids and fluid mixtures under high temperature, high pressure conditions. The apparatus is used to screen...
A new apparatus for measuring both the thermal conductivity and thermal diffusivity of fluids at temperatures from 220 to 775 K at pressures to 70 MPa is described. The instrument is based on the step-power-forced transient hot-wire technique. ...
This paper was written to commemorate the 50th anniversary of the atomic redefinition of the second in the International System (SI) in 1967. It focuses on the work of individuals and organizations in the United States who made significant...
CMSD; information model; interoperability; machine shop; manufacturing; simulation; standard
This report documents a journey “from research to an approved standard” of a NIST-led standard development activity. That standard, Core Manufacturing Simulation Data (CMSD) information model, provides neutral structures for the efficient exchange...
Dielectric liquids; electro-optical measurements; electrostatic field measurements; high voltage measurements; Kerr cell; laser applications; potential measurements; pulse measurements
A Kerr electro-optical technique, which permits observation and analysis of high intensity electric fields in nitrobenzene-filled Kerr cells, is described. Two-dimensional visual images, similar to those achieved in photoelastic-mechanical stress...
dimensioning and tolerancing; dimensional metrology; knowledge navigation; manufacturing training; VRML
Geometric dimensioning and tolerancing (GD&T) is a method to specify the dimensions and form of a part so that it will meet its design intent. GD&T is difficult to master for two main reasons. First, it is based on complex 3D geometric entities and...