446 results about "Shock strength" patented technology

Embodiments of the invention relate to a supersonic nacelle design employing a bypass flow path internal to the nacelle and around the engine. By shaping the nacelle, embodiments of the invention may function to reduce sonic boom strength, cowl drag, and / or airframe interference drag. Embodiments of the invention may also function to improve total pressure recovery and / or total thrust of the primary flow path through the engine.

An airfoil family for a helicopter rotor blade, designated SC362XX. SC362XX essentially removes the large lower surface suction peak associated with ‘drag creep’ at moderate lift coefficients while reducing the peak Mach number and shock strength at high lift / Mach number conditions. Another optional airfoil family for use at inboard regions of the helicopter rotor, which is designated SC3252XX airfoil family, is a relatively thicker airfoil section that includes a significant increase in thickness forward of the 30% x / c location to provide a relatively thick and rigid inboard section. The lift coefficient at which the drag divergence Mach number was optimized is the same in both families thereby readily providing application to a single rotor blade.

The invention provides a composite laminate with improved shock strength. The composite laminate comprises (a) multi layers of carbon fiber fabric layers, wherein the carbon fiber fabric is a woven bidirectional cloth or unidirectional cloth; (b) multi layers of non-woven thin felts, wherein the non-woven thin felt is composed of para-aromatic polyamide; and (c) a cured epoxy resin, wherein the cured epoxy resin is formed by solidifying an epoxy resin system for impregnation which is impregnated in the carbon fiber fabric layer (a), and at least one layer of the non-woven thin felt (b) is sandwiched between the two layers of the carbon fiber fabric layers, and the two outer surface layers of the composite laminate are carbon fiber fabric layers (a). The invention also provides a method for preparing the composite laminate with improved shock strength, and use of the composite laminate for preparing products or parts of sports equipment and transport tools.

A method for determining a cardiac shock strength, for example the programmed first-therapeutic shock strength of an implantable cardioverter defibrillator (ICD), including the steps of sensing a change in a T-wave of an electrogram with respect to time such as the maximum of the first derivative of a T-wave of an electrogram; delivering a test shock by (i) delivering a test shock at a test-shock strength and at a test-shock time relating to the maximum of the first derivative of the T-wave with respect to time; and (ii) sensing for cardiac fibrillation. If fibrillation is not sensed, test-shock delivery is repeated at the same test-shock strength and at specific, different test-shock times relating to the maximum of the first derivative of the T-wave. If fibrillation is still not sensed, the shock strength is decreased and test shocks are repeated at the same specific test shock times relative to the maximum of the first derivative of the T-wave. And if fibrillation is sensed, the programmed therapeutic shock strength of the ICD is set as a function of the incrementally greater test-shock strength. Also disclosed is an apparatus for selecting a programmed first-shock strength of an ICD, including a shock subsystem for delivering therapeutic shocks and test shocks to the heart, and a ULV subsystem connected to the shock subsystem, to provide test shocks of test-shock strengths and at test-shock times relating to the maximum of the first derivative of the T-wave with respect to time, and to determine the therapeutic shock strength of the ICD as a function of the test-shock strengths.