Stair structures

Another concept is based on neutral, polyfunctional Lewis-acid spacers for the construction of stair and ladder structures [103]. Ortho-phenylene(indium-bromide) 48 exists as a THF stabilized dimer. The p-orbitals at indium are orientated perpendicular to the diindacyclus. Reaction of 48 with pyrazine in a molar ratio of 1 1 or 1 2 in THF results in the stair-structured molecule 49 whereas in a molar ratio of 1 4 the ladder-structured 50 (both contain additional THF) is obtained (Fig. 7-11). The polymers are insoluble in nonpolar solvents... 

When complex equipment (e.g., a converter and fractionator in a fluid catalytic cracking unit) is designed, a stair structure with a vertical pipe rack must be located between both vessels, as shown in Exhibit 12-26. Although elevators are often used, diem approval must be obtained before they are included. The optimum layout includes arranging the vessel platforms for easy access from the structure. Clearance between the vessel and structure platforms must accommodate die growth of the vessels, which should be calculated to satisfy safety concerns. This structure eliminates the... 

Van Hove MA, Koestner RJ, Stair PC, Biberian IP Kesmodel LL, Bartos I, Somorjai GA. 1981. The surface reconstructions of the (100) crystal faces of iridium, platinum and gold, 1. Experimental-observations and possible structural models. Surf Sci 103 189-217. 

For enclosed process structures, any inside stairs that serve as an exit or exit component require enclosure to provide personnel protection from smoke and fire during emergency egress. The stair enclosures serving as an exit way must have the following fire-resistive construction ... 

For enclosed process structures, open outside stairs may be used for an exit, but require protective separation from the interior of the building by walls with the same fire resistance rating as required for enclosed stairs. This construction should extend vertically from the ground to a point 10 ft (3 m) above the topmost landing of the stairs or to the roofline, whichever is lower, and to a point not less than 10 ft (3 m) horizontally. 

Practice For the stair climb, run stair steps with a large weight on your shoulders, such as a bag of sand or feed. Parking structures are good because they require you to turn up each flight in the stairwell. Again, if the test requires turnout coat and SCBA, you may want to practice it in restrictive clothing and with a loaded backpack on your back. 

The structure of Ag(SCN)(PPr3) was found to contain zigzag polymeric —Ag—SCN—Ag— SCN chains,178 cross-linked in pairs by Ag—S bonds to form double chains having a stair-step... 

Until recently, only two reports existed for 1 1 adducts of silver halides with amines, namely AgT piperidine57 and Agl-morpholine.381 The first had a tetrameric cubane structure whilst the second was described as a stair polymer adduct. The range has now been extended to include 2-and 3-methylpyridine, quinoline and triethylamine.382 In each case the adduct was obtained by recrystallization of silver(I) iodide from neat base. The colourless crystals were found to lose base readily on exposure to the atmosphere and structural data were collected from crystals mounted in argon-filled capillaries, containing mother liquor. 

Quantum mechanics is a highly mathematical view of the atom and expands the classical physics viewpoint to explain atomic structure. A staircase is a useful analogy in discussing quanta, in that you climb the stairs in certain quanta or in certain discrete units, namely, the steps themselves. You cannot step anywhere other than on a stair tread, and standing in between steps is not possible. In the same way, electrons have certain permitted locations and cannot exist between these locations. 

Trying to determine the structure of a protein by UV spectroscopy was like trying to determine the structure of a piano by listening to the sound it made while being dropped down a flight of stairs. 

All equipment supporting structures, including platforms, stairs, ladders, railing, etc. 

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