Sheeting mechanism

Lomas DA, Elliott PR> Sidhar SK, Foreman RC> Finch JT, Cox DW, et al. al-Antitrypsin Mmalton (Phe52-deleted) forms loop-sheet polymers in vivo Evidence for the C sheet mechanism of polymerization. J Biol Chem 1995 270 16864-70. 

In the early 1990 s Kuroda et al. reported preparation of porous materials resulting from interaction of layered silica kanemite with alkyltrimethylammonium salt solutions [21]. Later on [22] they proposed the mechanism labeled FSM (Folding Sheet Mechanism see Fig. 4) to rationalize the nature of the products [23,24],... 

Fig. 4. Proposed mechanism of the formation of a mesoporous material by bending and condensation of surfactant treated kanemite (Folding Sheet Mechanism) ([22] reproduced by permission of The Royal Society of Chemistry],...

Another very remarkable structure was recently reported by the group of Kuroda [9]. So far all structures with one dimensional pore systems were either hexagonally packed or disordered. Kuroda succeeded in synthesizing a square packing of pores (Fig. 2) in an orthorhombic structure which are most probably formed following the folded sheet mechanism originally proposed for FSM-16. Formation of the material - called KSW-2 - is possible by strict pH control during the transformation of the kanemite-surfactant composite. 

To anchor the sheet mechanically, non-penetrating rivets are used to fix the membrane, particularly on sloped roofs or steep surfaces. Polyamide studs are fixed to the deck with an EPDM rubber cap and metal clip. Spacing of the studs depending on the expected wind lift, and the covering is then placed over the fixed studs. With the help of proper lubricants, caps are secured to the studs with a fastener tool and the perimeters can be secured with adhesive. 

Web formation, the second phase in manufacturing nonwoven fabrics, transforms fibers or filaments from linear elements into planar arrays in the form of preferentially arranged layers of lofty and loosely held fiber networks termed webs, batts, or sheets. Mechanical and fluid means are used to achieve the fiber arrangement. Basic fabric parameters established at web formation, in addition to fiber orientation, are the unfinished product weight per imit area and the manufactured... 

Intercalation of surfactant ions into layered silicates via a folded sheet mechanism (FSM materials). 

FIGURE 6 Scheme showing the folding sheet mechanism for the formation of mesoporous materials. 

Because of the difficult service requirements and the stringent need for absolute leak tightness, the early sodium (or NaK) cooled reactors utilized very conservatively designed steam generators. EBR-I, EBR-II, SRE, Hallam, and DFR all employed multiple barriers between the sodium and water/steam. The various concepts employed double tubes, double tube sheets, mechanical separation barriers, and in some instances methods of detecting leakage across one barrier. All of these units, with only minor exceptions, have performed satisfactorily and reliably. 

At relatively slow spin speeds and low liquid feed rates, viscosity and surface tension forces predominate. In that case, direct drop formation at the disk edge is usually found. The drops usually consist of a primary drop (relatively large) and several smaller satellite drops. Higher spin speeds and feed rates lead to drop formation from strings (mechanisms 2) and sheets (mechanism 3) in which inertial and frictional forces begin to dominate. 

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