Showing papers on "Shields published in 1978"

EMP Coupling Through Cable Shields

Abstract: Recent research in electromagnetic coupling between the interior and exterior of coaxial cables is described. Both tubular shields and shields with apertures are discussed with reference to the physical coupling mechanisms and their mathematical representations in terms of transmission-line models.

EMP coupling through cable shields

Abstract: Recent research in electromagnetic coupling between the interior and exterior of coaxial cables is described. Both tubular shields and shields with apertures are discussed with reference to the physical coupling mechanisms and their mathematical representations in terms of transmission-line models.

Coolant loop for the rotor of a turbogenerator with a superconductive exciter winding

Abstract: A coolant circulatory loop for a turbogenerator rotor having a superconductive field winding and a damper and cold shielding surrounding the field winding, the field winding being cooled by deeply-cooled liquid helium, and the damper and cold shielding by an at least partly vaporized partial flow of helium that has flowed through the field winding, includes a mixing chamber, means for feeding liquid helium in forced circulation from the mixing chamber to the field winding wherein it is heated due to winding losses and pressure reduction and is partly evaporated, means located in the rotating rotor for recooling the non-evaporated helium by removing heat of vaporization therefrom and returning the thus recooled helium to the mixing chamber, cooling means external to the rotor for recooling the partial flow of helium after it has cooled the damper and cold shielding and means for feeding the recooled partial flow of helium back to the mixing chamber.

Solar energy collector - with sensitive plate in evacuated space between two protective shields and in point contact with them

Abstract: An energy-absorbing plate is located between two transparent shields, the space between these being evacuated. The plate is formed with projections so that contact between it and the shields is at points or lines only. For solar energy absorbers with liq. or gaseous heat transfer media. Low heat losses and simple construction are obtd. Specifically the energy collector plate is flat and is formed with channels for the heat transfer fluid. It lies in the evacuated space between two transparent shield which are sepd. by spaces to withstand the external atmos. pressure.

Electrical inductive apparatus having non-magnetic flux shields

Abstract: The electrical inductive apparatus including non-magnetic flux shields constructed of strips of highly electrically conductive material which are arranged to form a continuous loop around the core window. The shields are disposed parallel to the laminations of the magnetic core and adjacent the top and bottom surfaces of the core. Current induced in the shields by the leakage flux from the windings produces an opposing flux which prevents substantially all of the winding leakage flux from entering the magnetic core.

Shielding of longitudinal magnetic fields with thin, closely, spaced concentric cylindrical shells with applications to atomic clocks

Abstract: A general formula is given for the longitudinal shielding effectiveness of N closed concentric cylinders The use of these equations is demonstrated by application to the design of magnetic shields for hydrogen maser atomic clocks Examples of design tradeoffs such as size, weight, and material thickness are discussed Experimental results on three sets of shields fabricated by three manufacturers are presented Two of the sets were designed employing the techniques described Agreement between the experimental results and the design calculations is then demonstrated

High resistance continuous shield for reduced capacitive coupling in a deflection yoke

Abstract: Capacitive coupling between coils of an electron beam deflection yoke and between coils and the electron tube is reduced by electrostatic shields The shields are continuous for best shielding Eddy currents flow in the shield resulting from the magnetic beam deflection fields results in field distortion and power loss The eddy current flow and the power loss are reduced by using a nickel chromium alloy material for the shield

Method of manufacturing honeycomb material with integral heat radiation shields

Abstract: A method of manufacturing structural honeycomb with superior insulation effectiveness, by the incorporation of integral heat radiation shields into the current process of manufacturing honeycomb hexagonal cells as formed by expanding a block of flat laminations. The heat radiation shields are initially in the form of flat ribbons (4) of thin low emissivity metal coated plastic film, which are bonded between each lamination, in a direction normal to either the adhesive lines, strips on stripes (2), or unmasked stripes, strips, or lines, used to bond the honeycomb nodes. The ribbons (4) are formed of compressed pleats, which open up when the flat laminated block is expanded, closing off each hexagonal cell with spaced heat radiation shields (6).

Magnetic shielding device for induction equipment

Abstract: PURPOSE:To prevent generation of local heating in the upper and lower flanges by permitting at least one side of the side walls of the upper tank and lower tank to project from the flange face and by permitting the upper and lower magnetic shields made of magnetic material to approach each other closer.

Spherical lead shields for megavoltage teletherapy.

Abstract: A new method of manufacturing individualized, focused lead shields for megavoltage teletherapy is described. Computerized film dosimetry demonstrated that in contrast to nonfocused shields, the new focused shields exhibit good maintenance of penumbra width as the distance between the edge of the beam and the central axis is increased.

The Shielding of Asynchronous Magnetic Fields in the Superconducting Synchronous Generator with Electromagnetic Shields

Abstract: The shielding effects of the single and double electromagnetic shields was investigated in terms of the field winding mechanical shield, the superconductor location, thickness, and conductivity. The eddy current loss and electromagnetic shield were evaluated in terms of the diffusion time constant.