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Showing papers on "Shields published in 1975"


Journal ArticleDOI
TL;DR: In this paper, an analysis of the shielding effectiveness of braided-wire shields is made using the parameters of the woven wire and the theory of electromagnetic coupling through small irises.
Abstract: An analysis of the shielding effectiveness of braidedwire shields is made using the parameters of the woven wire and the theory of electromagnetic coupling through small irises. The coupling through the rhombic-shaped holes in the braid is approximated by using the electric and magnetic polarizabilities of elliptical holes of the same width and length as the rhombus. The analysis develops the transfer impedance and the mutual capacitance of the shield. The transfer impedance is calculated and plotted for shields of different optical coverages. The variation of mutual capacitance and mutual inductance with the weave angle of the braid are examined.

150 citations


Patent
Charles Chia-Hsiung Lin1
02 Jun 1975
TL;DR: In this paper, a magnetoresistive sensing element used for sensing magnetic transitions includes relatively thick shields and substantially thinner shields between the thick shield and the MR element, and the output pulse waveform resulting from sensing a magnetic transition is improved permitting a higher linear density.
Abstract: A magnetoresistive sensing element used for sensing magnetic transitions includes relatively thick shields and substantially thinner shields between the thick shields and the MR element. The output pulse waveform resulting from the MR element sensing a magnetic transition is improved permitting a higher linear density. The thick shields can comprise the legs of an inductive write transducer with the thin shields and MR element interposed for the read function. Another read/write head embodiment can include a separate write tranducer with the thin shields and the MR element placed between one of the legs of a write transducer and a third magnetic shield formed from either a thick magnetic layer or a magnetic substrate.

60 citations


Journal ArticleDOI
TL;DR: In this article, the calculational methods developed for nuclear heating in an earlier paper are applied to fusion-reactor blankets and shields and the study shows that the nuclear heating is increased in fusion reactor blankets.
Abstract: The calculational methods developed for nuclear heating in an earlier paper are applied to fusion-reactor blankets and shields The study shows that the nuclear heating in fusion-reactor blankets h

17 citations


Patent
31 Oct 1975
Abstract: An electrostatic shielding arrangement for improving the initial distribution of voltage which in turn reduces the insulation stresses on disc-wound coils resulting from the application of impulse or steep wave-front voltages to such coils. Floating electrostatic shields are placed near or internal of the innermost or the innermost and outermost turns only of a disc coil section. Shields are connected together in pairs, with no more than one shield connection being made between adjacent coil sections.

8 citations


Patent
27 Aug 1975
TL;DR: In this article, a vacuum interrupter for high voltage applications is described, which comprises a tubular metal central shield around its arcing gap for condensing arc-generated vapors and two end shields located at opposite ends of the interrupters.
Abstract: This vacuum interrupter is for high voltage applications and comprises a tubular metal central shield around its arcing gap for condensing arc-generated vapors and two tubular metal end shields located at opposite ends of the interrupter. Two tubular metal intermediate shields are respectively provided at opposite ends of the central shield between the central shield and the adjacent end shields. These intermediate shields are normally electrically isolated from the central shield and the end shields. Each intermediate shield is disposed adjacent to the central shield but does not axially overlap with the central shield. Each intermediate shield also surrounds the inner end of its associated end shield in radially-spaced, axially-overlapping relationship with the associated end shield.

2 citations


Patent
24 Apr 1975
TL;DR: In this paper, a cylindric or truncated conic conic insulator is constructed from synthetic material in two parts by molding, pressing or injecting and hardening.
Abstract: The stalk type insulator which has been produced from synthetic material in two parts by moulding, pressing or injecting and hardening consists mainly of a cylindric or truncated conic stalk and at least two the stalk encircling shields in ring shape Each shield consists of a ring disc with two each other parallel, plane main surfaces which have an angle of inclination between 10 deg and 20 deg against a cross-section plane of the stalk through their geometrical centre At least over part of the height of the insulator are situated two adjacent shields and the lower one has a smaller diameter than the upper The outer edges of the shields lie on a conic surface The total number of shields is arranged in groups

2 citations



01 Jan 1975
TL;DR: In this paper, the authors applied radiofrequency signals simulating electrical interference ranging from 50 Hz to 50 MHz to the shields of the input cable system (two solid- shielded, mineral-insulated cables approximately 6 m long) of a wide-band differential preamplifier for use with fission counters as input devices as part of in-vessel, low-level flux monitors in future liquid- metal fast breeder reactors (LMFBRs) to determine the common-mode rejection.
Abstract: Radio-frequency signals simulating electrical interference ranging from 50 Hz to 50 MHz were applied to the shields of the input cable system (two solid- shielded, mineral-insulated cables approximately 6 m long) of a wide-band (approximately 60 MHz) differential preamplifier for use with fission counters as input devices as part of in-vessel, low-level flux monitors in future liquid- metal fast breeder reactors (LMFBRs) to determine the common-mode rejection. Results show that differences in electrical properties and shielding characteristics of the two input coaxial cables along with end effects produced by an unbalanced sensor severely degrade the rejection capability of the differential preamplifier. At 1 MHz, the common-mode rejection without input cables is approximately -70 dB; this is reduced to approximately -10 dB when measured with the rf signal applied to the surface of the input cable shields. Measurements of the shielding characteristics of the input cables showed resonances at test frequencies greater than 2 MHz. A ferrite core was installed in the input assembly to increase the impedance of the shields and to permit termination of the coaxial line consisting of the input cable shields and the protective metal conduit for the input cables. This assembly eliminated all resonances below 20 MHz. The increased impedance also reduced the amplitude of the shield currents, resulting in an increase in the shielding effectiveness of the input cables without affecting the signal transmission of the cables. (auth)

1 citations


Journal ArticleDOI
TL;DR: In this article, a single-scatter approximation of clearance gaps around plugs and other movable components can be derived from some typical geometries, and the accuracy of this method is shown to be sufficient for dealing with practical problems.