Moore

Semi-submersible rigs are often referred to as semis , and are a floating type of rig. Like the jack-up, a semi is self contained. The structure is supported by large pontoons which are ballasted with water to provide the required stability and height. The rig is held in position by anchors and mooring lines or dynamically positioned by thrusters. A large diameter steel pipe ( riser ) is connected to the sea-bed and serves as a conduit for the drill string. The blowout preventer (BOP) is also located at the sea-bed ( sub sea stack ). 

Ship-shaped FPSOs must be designed to weather vane i.e. must have the ability to rotate in the direction of wind or current. This requires complex mooring systems and the connections with the well heads must be able to accommodate the movement. The mooring systems can be via a single buoy or, in newer vessels designed for the harsh environments of the North Sea, via an internal or external turret. Figure 10.33 shows a schematic of the Shell-BP Foinaven FPSO. 

D. H. Kaelble, Physical Chemistry of Adhesion, Wiley-Interscience, New York, 1971. D. F. Moore, Principles arui Applications of Tribology, Peigamon, New York, 1975. 

D. F. Moore, Principles and Applications of D-ibology, Pergamon, New York, 1975. 

Langhoff C A, Moore B and DeMeuse M 1983 Diffusion theory and piooseoond atom reoombination J. Chem. Phys. 78 1191... 

Green W H, Moore C B and Polik W F 1992 Transition states and rate constants for unimolecular reactions Ann. Rev. Phys. Chem. 43 591-626... 

Polik W F, Guyer D R and Moore C B 1990 Stark level-crossing spectroscopy of Sq formaldehyde eigenstates at the dissociation threshold J. Chem. Phys. 92 3453-70... 

Miller W H, Hernandez R, Moore C B and Polik W F A 1990 Transition state theory-based statistical distribution of unimolecular decay rates with application to unimolecular decomposition of formaldehyde J. Chem. Phys. 93 5657-66... 

Moore J H, Davis C C and Copian M A 1989 Building Scientific Apparatus 2nd edn (Redwood City, CA Addison-Wesiey) ch 5 The fundamentais of eiectron opticai design. 

Goruganthu R R, Coplan M A, Moore J H and Tossell J A 1988 (e,2e) momentum speotrosoopio study of the interaotion of-CHj and - CFj groups with the oarbon-oarbon triple bond J. Chem. Phys. 89 25... 

Muiier M and Moor H 1984 Cryofixation of thick specimens by high pressure freezing The Science of Bioiogicai Specimen Preparation ed J-P Revei, T Barnard and G H Haggis (O Hare, iL SEM, AMF 60666) pp 131-8... 

Moor H 1987 Theory and practice of high pressure freezing Cryotechniques in Bioiogicai Eiectron Microscopy ed R A Steinbrecht and K Zieroid (Beriin Springer) pp 175-91... 

Schmidt S C, Schiferl D, Zinn A S, Ragan D D and Moore D S 1991 Calibration of the nitrogen vibron pressure scale for use at high temperatures and pressures J. Appi. Phys. 69 2793... 

Moore C B and Smith I W M 1996 State-resolved studies of reactions in the gas-phase J. Phys. Chem. 100 12 848... 

Kuciauskas D, Lin S, Seely G R, Moore A L, Moore T A, Gust D, Drovetskaya T, Reed C A and Boyd P D W 1996 Energy and photoinduced electron transfer in porphyrin-fullerene dyads J. Phys. Chem. 100 15 926-32... 

Liddell P A, Sumida J P, Macpherson A N, Noss L, Seely G R, Clark K N, Moore A L, Moore T A and Gust D 1994 Preparation and photophysical studies of porphyrin-Cgg dyads Photochem. Photobiol. 60 537-41... 

Carbonera D, DiValentin M, Corva]a C, Agostini G, Giacometti G, Liddell P A, Kuciauskas D, Moore A L, Moore T A and Gust D 1998 EPR investigation of photoinduced radical pair formation and decay to a triplet state in a carotene-porphyrin-fullerene triad J. Am. Chem. Soc. 120 4398-405... 

Moore G 1980 VLSI, what does the future hold Eiectron. Aust. 42 14... 

Hwang G S, Anderson C M, Gordon M J, Moore T A, Minton T K and Glapis K P 1996 Gas-surface dynamics and profile evolution during etching of silicon Phys. Rev. Lett. 77 3049-51... 

Winningham T A, Giiiis H P, Choutov D A, Martin K P, Moore J T and Dougias K 1998 Formation of ordered nanociuster arrays by seif-assembiy on nano-patterned Si(IOO) surfaces Surf. Sol. 406 221-8... 

Steinberg-Yfrach G, Rigaud G-L, Durantini E N, Moore A L, Gust D and Moore T A 1998 Light driven production of ATP catalysed by F0F1-ATP synthase in an artificial photosynthetic membrane Nature 392 479-82... 

Stephenson J C and Moore C B 1972 Temperature dependence of nearly resonant vibration-vibration energy transfer in COj mixtures J. Chem. Phys. 56 1295-308... 

Yardley J T and Moore C B 1967 Intramolecular vibration-to-vibration energy transfer in carbon dioxide J. Chem. Phys. 46 4491-5... 

Moore C B 1969 Laser studies of vibrational energy transfer Accounts Chem. Res. 2 103-9... 

Moore P, Tokmakoff A, Keyes T and Payer M D 1995 The low frequenoy density of states and vibrational population dynamios of polyatomio moleoules in liquids J. Chem. Phys. 103 3325-34... 

The mathematical form of the PEF is in almost every case a compromise between speed and accuracy. As computer power continually increases, ideally following Moore s Law, and the cost/performance ratio is getting better, one might think that there is no longer a need to sacrifice accuracy to save computational time. This is not really true, because in direct proportion to the CPU speed is the rise in the scientists interest in calculating larger and larger molecules (in fact, their interest always rises faster than the CPU speed). 

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