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A model is proposed for the mechanism of material removal in ultrasonic machining. From this model and fundamental physical principles, a machining rate equation is derived for the special case where solid, circular tools are used in conjunction with a puddled slurry. A comparison of the...
An experimental study of the L cathode is presented, including the chemistry of carbonate decomposition and barium generation, the origin of BaO in the evaporant, the barium transport mechanism through the porous plug, and the factors determining cathode life. Carbonate decomposition is...
Compressional creep tests were run on single crystals oriented so that the direction of compression was along the c axis. Two activation energies of creep were found: approximately 24 500 cal∕mole above 120°C and 12 000 cal∕mole below this temperature.
The work functions of germanium single crystals have been obtained by measuring the contact potential differences between the germanium crystals and a gold reference whose work function was measured by the Fowler method. Work function values for the bombardment‐cleaned surfaces of three samples...
Performance characteristics of the L cathode, including emission, evaporation rate, and evaporant composition, are presented, followed by an investigation of the constitution of the emitting surface. Activation of the external tungsten surface is effected by the migration thereover of strongly...
A variational method is used to calculate the distribution of energy reflected from an echelette diffraction grating. Experiments performed using a klystron generating 3.2‐cm electromagnetic waves which impinge upon a large scale grating agree with the calculations to within a few percent, the...
The internal friction peak in tantalum arising from the diffusion of interstitial carbon has been located at 338°C for vibration frequencies of 0.55 cps. The corresponding activation energy is 39.6 kcal. The identification of this peak is made difficult by its proximity to the nitrogen peak....
Area contacts of twenty different metals were made on n and p silicon. The contacts were applied by the use of jet plating techniques, with the exception of alkali metal contacts which were pressure contact or mercury amalgam contact. A qualitative correlation is shown to exist between the work...
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