UNUCIWaALeL-pLlessuLre recoras as a runction aistance, or deptn, and time for support of other projects. Gages were installed in five different stations located at 2036, 4421, 7702, 9189, and 10.420 feet on a radial line from surface zero. The importance of shock-wave refraction was substantiated at the 9189-foot station by the magnitudes of the pulses, which were significantly lower than would be predicted by calculations using isovelocity conditions. Major Descriptors: -- REFRACTION; *HARDTACK PROJECT -- UNDERWATER EXPLOSIONS; *UNDERWATER EXPLOSIONS -- SHOCK WAVES *SHOCK WAVES Descriptors: PRESSURE MEASUREMENT Broader Terms: EXPLOSIONS; Subject Categories: 450202* Weaponry -- 10/5/581 01797201 Author(s): (-1989) (Item 281 -- Explosions & Explosives -- Nuclear -- from file: ERA-11-038768; Bultmann, NUCLEAR EXPLOSIONS E.H.; 103) EDB-86-120989 McDonough, G.F.; Sinnamon, G.K. Title: Operation Hardtack. Project 1.9. Loading on buried simulated structures in high-overpressure regions. Report for April-October 1958 Corporate Souree: Kaman Tempo, Santa Barbara, CA (USA) Publication Date: 31 Oct 1984 p 60 Report Number(s): AD-A-995263/1/XAB Document Type: Report Language: English Journal Announcement: EDB8606 Availability: NTIS, PC A04/MF AOl. Subfile: ERA (Energy Research Abstracts). GRA (NTIS NTS) Country of Origin: United States Country of Publication: United States Abstract: The objective of this project was to study some of the factors affecting the transmission of air-blast-induced pressure through soil and the loading produced on buried structures by such pressures in the high-pressure region (approximately 250 psi). Factors studied were: (1) the attenuation of pressure in a sand deposit when the water table is a few feet below the ground surface; (2) the effect of duration of positive phase of blast on the pressure transmitted through such a soil; (3) the effect of structure flexibility on the pressure acting on structures buried in such a soil; and (4) the relationship between horizontal and vertical pressures in such a soil. The project employed 43 devices, each a rigid cylinder having one rigid end and one deformable-diaphragm end. The devices were buried at depths ranging from 0 to 20 feet at each of two locations at the Eniwetok Proving Ground. The locations were chosen to give a predicted ground surface overpressure of about 250 psi from each of two shots, Cactus and Koa. Major Descriptors: *HARDTACK PROJECT -- NUCLEAR EXPLOSIONS; *MECHANICAL STRUCTURES -- DYNAMIC LOADS; *NUCLEAR EXPLOSIONS -- BLAST EFFECTS; *NUCLEAR EXPLOSIONS -- PRESSURE MEASUREMENT Broader Terms: EXPLOSIONS; NUCLEAR EXPLOSIONS Subject Categories: 450202* Weaponry -- (-1389) 10/5/582 01797200 Author(s): -- Explosions & Explosives -- Nuclear -- (Item 282 from file: 103) BRA-11-038767; EDB-86-120988 Patteson, A.W. Title: Operation Hardtack. Project 1.4. Physical characteristics of craters from near-surface nuclear detonations. Report for April-October 1958 Corporate Source: Kaman Tempo, Santa Barbara, Publication Date: 31 Oct 1984 p 41 Report Number(s): AD-A-995262/3/XAB Document Type: Report Language: English Journal Announéement: EDB8606 Availability: NTIS, PC A03/MF AOl. Subfile: ERA (Energy Research Abstracts). Country of Origin: United States 9003632 CA (USA) GRA (NTIS NTS)