摘要:
A gas generating composition containing glycidyl azide polymer and a high trogen content additive selected from the group consisting of guanylaminotetrazole nitrate, bis(triaminoguanidinium)5,5'azotetrazole, ammonium 5-nitraminotetrazole and high bulk density nitro guanidine generates large quantities of nitrogen gas upon burning and can be used to extinguish fires.
摘要:
Gun propellant is coated with an oligomer having the structure: ##STR1## wherein R is --CH.sub.2 CH.sub.2 CH.sub.2 Si(OCH.sub.3).sub.3 ; wherein ns an integer of from 5 to 50 and wherein m is an integer of from 1 to 5. The purpose of the coating is to decrease the peak pressure produced but make the pressure that is produced last longer.
摘要:
A method for stabilizing the soil wherein a liquid selected from the grouponsisting of (1) a mixture of dimer diisocyanate and dimer diamine; and (2 ) a mixture of dimer diisocyanate and a ketimine derivative of dimer diamine is applied to the soil and allowed to polymerize to form an elastomeric resin which bonds the soil particles together to form a composite structure.
摘要:
A continuous polymer film formed by air-activated cross-linking of polyfuional prepolymers is applied to the surface of a body of water for suppressing evaporation.
摘要:
A shock wave barrier comprises a periodic structure having the proper symmetry and local contrast modulation of the acoustic index to divert an incident shock wave by using constructive/destructive interference phenomena that produce a “band gap” in the transmission spectrum of the periodic structure. In general, shock wave energy within the band gap is reflected from the structure. Defect cavities may be formed in the periodic structure to create transmission resonances or “windows” in the band gap. A portion of the incident energy passes through the window and is concentrated in the defect cavities where it is dissipated by other means. The band gap can be quite wide, at least 50% of the center wavelength, and thus can provide an effective barrier from a wide variety of threats with varying blast pressure and range. The structure may be periodic in two or three dimensions providing a band gap barrier in two or three dimensions, respectively.
摘要:
An acoustic crystal explosive, which gains its properties from both its periodic structure and its composition, may be configured to suppress or enhance the sensitivity of detonation of the explosive in response to an acoustic wave. An explosive material and a medium (explosive or inactive) are arranged in a periodic array that provides local contrast modulation of the acoustic index to define a band gap in the acoustic transmission spectrum of the explosive materials. At least one defect cavity in the periodic array creates a resonance in the band gap. The defect cavity concentrates energy from an incident acoustic (shock) wave to detonate the explosive. Multiple defect cavities may be configured to provide a desired shaped charge or volumetric detonations. Means may be provided to reprogram the defect cavity(ies) to reconfigure the explosive.
摘要:
An arm sling assembly is disclosed for supporting at least one of the arms of a patient in an angled orientation against the torso. The assembly includes a sleeveless vest dimensioned to be worn on the torso of the patient. The vest is openable at the front to facilitate donning of the assembly. Moreover, attached to the one or both of the front portions of the vest is an arm support cuff. In particular, the support cuff is stitched to the front left or right portion of the vest along vertically spaced upper and lower attachment zones and is detached from the front portion between the zones so as to define an open-sided arm passageway in which the arm is inserted and supported. An alternative embodiment is also disclosed wherein the arm cuff is adjustably and removably attached to the vest at the upper attachment zone. This embodiment further includes a retaining strap that attaches to the back of the vest and encircles the supported arm(s), the arm support cuff(s), and a portion of the torso to securely retain the supported arm(s) against the torso of the patient.
摘要:
Measurement and correlation of chamber pressure and projectile position d is accomplished using an array of phototransistors, illuminated by collimated light, which phototransistors are sequentially switched off due to the interruption of the collimated light by the passing projectile. Pulses generated thereby may be displayed on an oscilloscope along with the pressure-time trace.
摘要:
A system for eliminating background signals in chopped infrared measuring systems employs operational amplifier principles for subtracting a reference signal of proper amplitude, phase and frequency from the background-plus-signal radiation. The output is converted to a dc voltage level directly related to incident flux.
摘要:
A shock wave barrier comprises a periodic structure having the proper symmetry and local contrast modulation of the acoustic index to divert an incident shock wave by using constructive/destructive interference phenomena that produce a “band gap” in the transmission spectrum of the periodic structure. In general, shock wave energy within the band gap is reflected from the structure. Defect cavities may be formed in the periodic structure to create transmission resonances or “windows” in the band gap. A portion of the incident energy passes through the window and is concentrated in the defect cavities where it is dissipated by other means. The band gap can be quite wide, at least 50% of the center wavelength, and thus can provide an effective barrier from a wide variety of threats with varying blast pressure and range. The structure may be periodic in two or three dimensions providing a band gap barrier in two or three dimensions, respectively.