F.P.S. system

Imperial units The British system of units based on the pound and the yard. The former f.p.s. system was used in engineering and was loosely based on Imperial units for all scientific purposes SI units are now used. Imperial units are also being replaced for general purposes by metric units. 

F.P.S. system n. The foot-pound-second system of units. The British system of physical units derived from the three fundamental units of length, mass, and time, i.e., the foot, pound, mass, and the second. 

SI n. (1) Abbreviation for silicon or polydi-methylsiloxane. (2) Abbreviation for international systems of units , derived from the official French name, Le System International d Unites. An internationally agreed coherent system of units, derived from the MKS system, now in use for all scientific purposes and thereby replacing the cgs system and the f.p.s. system. The seven basic units are the metric (symbol m), kilogram (kg), second (s), ampere (A), Kelvin (K), mole (mol), and candela (cd). The radian (rad) and steradian (sr) are supplementary units. Derived units include the hertz (Hz), newton (N), joule (J), watt (W), coulomb (C), volt (V), farad (F), ohm (Q), weber (wb), tesla (T), henry (H), lumen (Im), and lux (lx). 

N, 0, F, P, S, and Cl the bond orbitals for normal valence compounds lead to about the same radii as tetrahedral orbitals, whereas in atoms below these in the periodic system normal valence bonds involve orbitals which approach p-orbitals rather closely, and so lead to weaker bonds, and to radii larger than the tetrahedral radii. This effect should be observed in Br, Se, and As, but not in Ge, and in I, Te, and Sb, but not Sn. For this reason we have added 0.03 A to the tetrahedral radii for As and Se and... 

At the time of writing, conversion from the Imperial (F.P.S) to metric system of units, especially in North America, is far from complete. Thus Imperial units have generally been used in the text with metric equivalents provided in brackets. In tables and figures, the system of units given in the original source (usually Imperial) has been retained. 

Ramanathan, P, S. Kannan, and J.F. Davis, Use Knowledge-Based-System Programming Toolkits to Improve Plant Trouhleshooting, Chemical Engineeiing Piogiess, June 1993, 75-84. (Expert system approach)... 

F.lleson,. S., and A. T. Kirkpatrick. 1997. Overview of the ASHRAE Cold Air Disttibiitiori System Design Guide. ASHRAE Transactions, vol. 107, p. 1. 

P s = design suction pressure of ejector, torr V = free volume of the process system, cu ft Wj = ejector capacity, 70°F dry air basis, Ib/hr... 

Sazani P., Gemignani F., Kang S.H., Maier M.A., Manoharan M., Persmark M., Bortner D., Kole R. Systemically delivered antisense oligomers upregulate... 

A homonuclear spin-system may be excited with radiofrequency (r.f.) pulses that are so Intense (in the order of p.s), compared to the frequency width of the spectrum, that all resonances are excited essentially uniformly. This is a nonselective excitation. A homonuclear spin-system may also be excited with a relatively weak, r.f. pulse (in the order of ms), in the sense that all components of a given multiplet are inverted at time zero, whereas the other resonances in the spectrum remain essentially unperturbed this is a selective excitation. The r.f. pulse may be single-selective, that is, there is an inversion of one multiplet in the spectrum, or double-selective, triple-selective, and so on, where two, three, or more separate multiplets in the spectrum are inverted simultaneously while the remaining resonances remain unperturbed. 

Nagy I, F Compernolle, K Ghys, J Vanderleyden, R De Mot (1995a) A single cytochrome P-450 system is involved in degradation of the herbicides EPTC (S-ethyl dipropylthiocarbamate) and atrazine by Rhodococcus sp. N186/21. Appl Environ Microbiol 61 2056-2060. 

Nagy 1, G Schools, F Compermolle, P Proost, J Vanderleyden, R De Mot (1995b) Degradation of the thiocar-bamate herbicide EPTC S-ethyl dipropylcarbamoylthioate and biosafening by Rhodococcus sp. strain N186/21 involve an inducible cytochrome P-450 system and aldehyde dehydrogenase. J Bacterial 177 676-687. 

The hydrosilylation of alkynes has also been studied using as catalysts Pt, Rh, Ir and Ni complexes. The improvement of the regioselectivity of the catalyst and the understanding of stereoelectronic factors that control it have been major incentives for the ongoing research. From numerous studies involving non-NHC catalysts, it has been established that there is a complex dependence of the product ratio on the type of metal, the aUcyne, the metal coordination sphere, the charge (cationic versus neutral) of the catalytic complex and the reaction conditions. In the Speier s and Karstedt s systems, mixtures of the thermodynamically more stable a- and -E-isomers are observed. Bulky phosphine ligands have been used on many occasions in order to obtain selectively P-f -isomers. 

Aghajanian, G.K. and Vandermaelen, C.P. Specific systems of the reticular core Serotonin. In Mountcastle, V.B. Bloom, F.E. and Geiger, S.R., eds. Handbook of Physiology, Volume IV. Intrinsic Regulatory Systems of the Brain. Bethesda, MD American Physiological Society, 1986. pp. 237-256. 

Fig. 27. Components and connections. [Drawn from J. S. Mullhi, M. L. Ang, and F. P. Lees, Reliability Engineering and System Safety, 23, 31 (1988).

In order to correctly predict which ligands occupy which sites in such compounds, one must recognize that, as a general rule, fluorines will always prefer the axial site in a trigonal bipyramidal system, perhaps because of fluorine s small size, but probably also because of its preference to bind to orbitals with as little s-character as possible. The orbitals used by P to make its axial bonds have less s-character than those used to make its equatorial bonds. This is reflected by the larger F—P coupling constants to the equatorial fluorine substituents. 

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