Specific cavity

Short shot can be avoided by proper mold design and control of polymer melt conditions—namely, temperature and injection pressure. This relationship is shown in Figure 7.76. Within the area bounded by the four curves, the specific polymer is moldable in the specific cavity. If the pressure and/or temperature are too low, short shot will result. If the temperature is too high, thermal degradation of the polymer can occur. If the temperature is too low, the polymer will not be molten. If the pressure is too high or the polymer is too fluid, the melt can flow into the gaps of the mold, creating thin webs of polymer attached to the molded article in an undesirable part... 

Type I sealant is suitable for use when the expl charge is TNT, Tritonal, Picratol and Minol-2. Type II is to be used with TNT, H-6, Tritonal, Composition B, Picratol and Minol-2. The sealing compd is melted and poured into the specific cavity where, desired. The sealer in the tail portion of the bomb is poured in the cavity as soon as the freshly poured molten expl charge has crusted over . The base plate, which closes the assembly, is screwed into place while the v sealing compn is still molten. Some bomb base plates are equipped with anti-withdrawal pins which extend down into the wax pad. Disassembly of the base plate after the compn solidifies is made difficult because of these pins... 

This is possible because both Xe and Kr have long residence times in a specific cavity. The Ar or CH4 molecule is freely exchanging between cavities but the Xen chemical shift reports the average number of Ar or CH4.with Xen, thus providing a more complete picture of distribution of mixed adsorbed species within a zeolite than has ever been obtained before. 

Fig. 1. Schematic diagram of the molecular imprinting process of specific cavities in a crosslinked polymer with the template (T) and functional monomers...

Figure 6.13. Schematic representation of the imprinting of specific cavities in cross-...

Scheme 4.1. Schematic representation of the imprinting of specific cavities in a cross-linked polymer by a template (T) with three different binding groups [4,5].

Scheme 4.II. Schematic representation of the polymerisation of 1 to obtain a specific cavity. The template la can be removed with water or methanol, leaving behind the free cavity [4].

Heilmann J, Maier WF (1994) Selective catalysis on silicon dioxide with substrate-specific cavities. Angew Chem Int Ed Engl 33 471... 

The formation of a spatially and functionally specific cavity has an obvious application in enzyme type catalysis [112]. Furthermore, in the light of interest in catalytic antibodies [113], the analogy between antibody and MIP suggests the concept of catalytic plastibodies . Robinson and Mosbach [114] demonstrated the potential for catalytic activity by imprinting a transition state analogue (p-nitrophenylmethyl-phosphonate) of the hydrolysis of p-ni-trophenylacetate (Figure 6.29)... 

TEM results directly evidence on appearance of nanoparticles together with specific r elief o f t he matrix i n t he p article s unrounding. D iameter o f t he p articles varies in the range of 20-100 run. Nanoparticles are usually located in the specific cavities those can appear due to very different melting temperatures of matrix and semiconductors (AT>300 K). 

Liquids.—The sp. gr. of liquids is determined by the specific cavity balance, by the specific gravity bottle, sometimes called pionometer, or by the spindle or hydrometer. 

Kaiser G.G. and Anderson J.T. (1992) Sorbents for liquid chromatography based on the footprint principle, Fresenius J. Analyt. Chem., 342, 834-838. Heilman J. and Maier W.F. (1994) Selective catalysis on silicon dioxide with substarte-specific cavities, Angew. Chem., Int. Ed. Engl, 33, 471-473. 

Bowl feeder Worktrays with workpiece-specific cavities... 

Fujii, Y. Kikuchi, K. Matsutani, K. Ota, K. Adachi, M. Syoji, M. Haneishi, I. Kuwana, Y. Template synthesis of polymer schiff base Cobalt (III) complex and formation of specific cavity for chiral amino acid. Chem. Lett. 1984,13, 1487-1490. 

The flow path length varies from 40 to 800 mm the wall thickness ranges from 0.5 to 3 mm with the possible flow path increasing as the wall thickness increases (for 0.5 mm thick walls the flow path ranges from 35 to 130 mm). The required specific cavity pressure varies from 18 MPa for low viscosity melts, thick walls to 200 MPa for high viscosity, thin walls. 

It should be noted that within the territory of development of a pure carbonate karst, in particular within hmestones of the Western Ural rugosity zone, the spatial relation of surface and especially subsurface karst forms (cavities) to elements of a buried relief is shown particularly vivid. Specifically, cavities are strictly bound to linear lowering of a relief, their axial zones. 

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