Pyrotechnic universe
نویسندگان
چکیده
منابع مشابه
Pyrotechnic Universe
One of the central points of the ekpyrotic cosmological scenario based on Hor̆ava-Witten theory is that we live on a negative tension brane. However, the tension of the visible brane in HW theory, as well as in relevant cases of non-standard embedding, is positive. To make this scenario realistic one must solve the problem of the negative cosmological constant on the visible brane and fine-tune ...
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One of the central points of the ekpyrotic cosmological scenario based on Hor̆ava-Witten theory is that we live on a negative tension brane. However, the tension of the visible brane is positive in the usual HW phenomenology with stronger coupling on the hidden brane, both for standard and nonstandard embedding. To make ekpyrotic scenario realistic one must solve the problem of the negative cosm...
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Pyrotechnic delays are used in commercial and military items requiring a time delay between two energetic events. For example, US Army hand-held signals (HHS) use a delay element to properly sequence the expulsion of illuminating rounds at the rockets’ apex. Many military delay formulations contain barium, lead, chromates, and perchlorates. The US Army is reformulating pyrotechnic items to remo...
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A t ris timulus photoelectric colorimeter has been designed ~o. measure the chromaticities of p yro techni c smokes ha ving hi ghly saturat~d colors. To ~llInllmZe edg,e, effects an.d r~a: wall r efl ection t he smoke chamber was desIgn ed as a 36-111Ch cube: Ihree fil ters " el e designed to approxim.ate .the dayligh~ e I E standard observer Junctl~ns for. t he SOUl'C~ filter -pho\.otube com...
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Smokes are used on the battlefield for signaling, for marking targets, and for screening troop movements. Many high-performance compositions are toxic or hazardous, while non-toxic alternatives offer sub-par performance. The environmentally benign compositions described herein use boron carbide as a pyrotechnic fuel to produce thick clouds of white smoke. Experimentation and thermodynamic model...
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ژورنال
عنوان ژورنال: Physical Review D
سال: 2001
ISSN: 0556-2821,1089-4918
DOI: 10.1103/physrevd.64.123523