Density, pressed

Interstitial Gas on the Shock Sensitivity of Low Explosive Compacts , Ibid, 349-58(1965) 13) Marjorie W. Evans et al, Shock Initiation of Low-Density Pressing of Ammonium Perchlorate , Ibid, 359-71 14) Donna Price T.P. 

Shock Initiation of Low-Density Pressings of Ammonium Perchlorate , 4thONRSymp-Deton (1965), 359-72... 

Powder, color Density, apparent, g/cc Density, pressed at at 20000 psi Ballistic Mortar Blast Effects Brisance by Sand Test, g sand crushed Brisance for TNT Detonation Rate... 

Fig 6b. Layer of low density (pressing of the material takes place at the beginning of the impact)... 

Particle size, mean, microns Apparent density, g/cc (Ref 1) Density (pressed at 15000 psi), g/cc... 

Apparent powder density Apparent powder volume Bulk powder density Effective solid density Green density Pressed density Immersed density... 

Tighter tolerances on finished hole sizes -Necessary for high-density press-fit coni ctk s... 

Figure Bl.17.11. Reconstructed density of an a,p-tiibulin protein dimer as obtained from electron crystallography (Nogales etal 1997). Note the appearance of the p-sheets ((a), marked B) and the a-helices ((b), marked H) in the density. In particular the right-handed a-helix H6 is very clear. Pictures by courtesy of E Nogales and Academic Press.

Parr R G and Yang W 1989 Density Functionai Theory of Atoms and Moiecuies (New York Oxford University Press)... 

K. Blum, Density matrix theory and applications. Plenum Press, New York, 1981,... 

Jj u e e. press the molecular orbital ipj as a linear combination of basis functions, then the electrojT density at a point r is given as ... 

Parr, R. G. Yang, W. 1989. Density Functional Theory of Atoms and Molecules. Oxford Univ. Press, New York. 

The usual commercial form of the element is powder, but it can be consolidated by pressing and resistance-sintering in a vacuum or hydrogen atmosphere. This process produces a compact shape in excess of 90 percent of the density of the metal. 

Plywood furniture core panels, also about 19 mm (3/4 in.) thick, were normally made of a number of layers of relatively thick, 1.5—3.0 mm (1 /16—1 /8 in.) lower value wood veneers combined with thin surface pHes of the decorative veneer. These assembhes were laid-up from glued veneers and then pressed while the bonding occurred. Both lumber core and plywood core have been almost totally displaced in recent years by particleboard or medium-density fiberboard, both discussed herein. This change resulted from the increasing availabiHty and improved finishing characteristics of composites and from decreasing suppHes of core lumber or veneer of suitable quaHty. 

The mats are moved along the line to the press loader. When the loader is filled and the press opens to remove the load of freshly pressed boards, the loader pushes the new boards into the unloader and deposits the load of mats on the press platens. The press closes as quickly as possible to the desired panel thickness. More pressure, as much as 4.8—6.9 MPa (700—1000 psi) is required to press high density dry-process hardboard, because the dry fiber exhibits much more resistance to compression and densification than wet fiber. Press temperatures are also higher, in the range of 220—246°C. No screens are used in the dry-process, but the moisture in the mats requires a breathe cycle during pressing to avoid blowing the boards apart at the end of the cycle. Because no screens are used, the products are called smooth-two-sides (S-2-S), in contrast to the wet-process boards, which have a screen pattern embossed into the back side and are known as smooth-one-side (S-l-S). 

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