Gasket

About: Gasket is a research topic. Over the lifetime, 24101 publications have been published within this topic receiving 113641 citations.

On a spectral analysis for the Sierpinski gasket

Abstract: A complete description of the eigenvalues of the Laplacian on the finite Sierpinski gasket is presented. We then demonstrate highly oscillatory behaviours of the distribution function of the eigenvalues, the integrated density of states (for the infinite gasket) and the spectrum of the Laplacian on the infinite gasket. The method has two ingredients: the decimation method in calculating eigenvalues due to Rammal and Toulouse and a simple description of the Dirichlet form associated with the Laplacian.

Electric heating apparatus for de-icing pipes

Abstract: An apparatus for heating liquid in a pipe to prevent freezing of the liquid and for de-icing of frozen pipes includes an elongated housing constructed of plastic material and having a central bore and fittings for detachably coupling each end of the housing to the open end of a liquid pipe so that the central bore connects a first liquid pipe to a second liquid pipe. The fittings each comprise a sleeve attachable to the pipe end, a sealing gasket between the end of the housing and an annular flange on the sleeve, and a threaded coupling nut cooperating with external threads on the housing and having a flange engaging the sleeve flange. The housing includes a lateral passageway intermediate its end communicating with the central bore and closed by a sealer valve having an opening with a normally closed penetrable seal of elastomeric material. An elongated electric resistance heating cable, including a probe containing an electric heating core at the free end thereof, is slidably insertable through the penetrable seal into the housing bore and then into one of the pipes through the open end thereof. An electric control means including a switch and rheostat is mounted on the housing and connected to the heating cable for controlling the operation and temperature of the heating cable. The cable is sufficiently rigid to allow the cable to be pushed through the sealer valve into the bore and flexible enough to follow the contour of the pipe bends as the cable is pushed into the pipe.

Ultra‐High‐Pressure, High‐Temperature Apparatus: the ``Belt''

Abstract: Equipment is described for maintaining pressures of 100 000 atmos at temperatures in excess of 2000°C for long periods of time. The equipment makes use of conical Carboloy pistons that push into each end of a specially shaped Carboloy chamber. Both chamber and pistons receive lateral support from stressed binding rings. Axial motion of the conical pistons in and out of the chamber is accomplished (while still maintaining a pressure seal) by the use of a specially shaped sandwich gasket made up of naturally occurring pyrophyllite and a steel cone. The arrangement gives a multistaging effect in a single stage. Pyrophyllite in addition to its use in the gasket is also used as pressure transmitting medium, thermal insulation, and electrical insulation. The sample is heated by passage of an electric current through a metal or graphite tube. Methods of pressure and temperature calibration as well as construction details are discussed.

Aerosol valve assembly

Abstract: 877,933. Valves. AEROSOL RESEARCH CO. June 13, 1958, No. 19080/58. Class 135. [Also in Group XXVIII] An aerosol valve comprises a gasket 9 sealing the outlet of a mounting cup 2 adapted to engage the upper edge of a container, a sealing cup 19, a spring 18 normally holding the cup in sealing engagement with the underside of the gasket 9 and a dispensing head 22 having an outlet orifice 32 communicating with a hollow stem 26 provided with a longitudinal metering groove 29 in its outer surface, the dispensing head being operable either by tilting it or depressing it to displace the sealing cup 19 from sealing engagement with the gasket 9 to permit material released by the breaking of the seal to flow along the metering groove and into and through the stem 26. More than one groove may be provided and a notch may be provided at the bottom of the groove or grooves to form a passage from the groove to the interior of the stem. The spring 18 is housed within a ribbed tubular shell 11 dimensioned to fit within the hub of the mounting cup 2. A syphon tube 16 leads from the shell 11 to the bottom of the container. The head 22 complete with stem 26 may be readily withdrawn from the gasket 9 for cleaning purposes. In another embodiment the orifice 32 in the head 23 is omitted so that the valve can be used for dispensing foam.