Kohl, A. L., and Riesenfeld, F. C., Gas Purification, Gulf Publishing Company, Houston, Texas 1979.  [c.65]

Plug-flow reactors have a decreasing concentration gradient from inlet to outlet, which means that toxic compounds in the feed remain undiluted during their passage along the reactor, and this may inhibit or kill many of the microorganisms within the  [c.315]

The production tubing provides the conduit from the reservoir to the wellhead, and Is located in the well by a sealing production packer which maintains pressure isolation between the reservoir and the annulus outside the tubing. Control of the well can then be effected under normal conditions by the series of control valves on the Christmas tree at surface. In the highly unlikely event of failure of all of the Christmas tree valves (such as damage of the wellhead), the subsurface safety valve (SSSV), which requires an active pressure to keep it open, will close. The circulating sleeve may be opened using a wireline tool to provide communication between the annulus and the production tubing. This may be necessary to kill the well or to replace the tubing contents with a light fluid such as diesel to enable fluid to start flowing. Wireline nipples have internal machined profiles which allow special plugs to seat and locate into them. These wireline plugs have many uses, but are commonly used to provide barriers to fluid flow during workover operations. The nipples are also used to hang off pressure gauge carriers for well testing.  [c.228]

An appropriate estimate of technical cost is important for economic analysis. Underestimating costs may lead to funding difficulties associated with cost overruns, and ultimately, lower profitability than expected. Setting estimates too high can kill a project unnecessarily. Costs are often based on suppliers price lists and historical data. However, many recent oil and gas developments can be considered pioneering ventures in terms of the technology and engineering applied. Estimating solely on the basis of historical costs can be inappropriate.  [c.299]

Bilge keel butts Throughout 1 in 10 welds  [c.1043]

J. Tille and J. C. Kelley, Brit. J. Appl. Phys., 14(10), 717 (1963).  [c.39]

Lj. Maksimovic, D. Babic, and N. Kallay, J. Phys. Chem., 89, 2405 (1985).  [c.346]

N. Kallay, B. Biskup, M. Tomic, and E. Matijevic, J. Colloid Interface ScL, 114, 357 (1986) G. Thompson, N. Kallay, and E. Matijevic, Chem. Eng. ScL, 39, 1271 (1984).  [c.462]

N. Kallay, E. Barouch, and E. Matijevic, Adv. Colloid Interface ScL, 27, 1 (1987).  [c.462]

The idea of a physically adsorbed precursor state turns out to be difficult to evaluate experimentally. TTie process of forming such a state has been called trapping, and the probability of an impinging molecule losing enough kinetic energy to trap in a molecularly adsorbed state is called the condensation coefficient, c. One would expect c to decrease with increasing kinetic energy of the impinging molecule, and this has been observed [122] and by using molecular beam techniques, the angle of incident of the beam may be varied, and now c should depend on kin 6 where 6 is the angle of incidence and kin is the overall kinetic energy (see Problem XVIII-32). Experimentally, the 6 dependence may be cos d", where n is much less than 2 (see Ref. 122), and the explanation is not clear. The complexities of the model are developed by Xu and Koel [115] for the case of bimetallic catalysts some half dozen probabilities or coefficients are involved.  [c.705]

C. T. Campbell and B. E. Koel, Surf. ScL, 186, 393 (1987).  [c.745]

D. H. Parker, M. E. Bartram, and B. E. Koel, Surf. Sci., 217,489 (1989).  [c.746]

R. G. Windham, M. E. Bartram, and B. E. Koel, J. Phys. Chem., 92,2862 (1988).  [c.747]

C. T. Campbell and B. E. Koel, J. Catal, 92, 272 (1985).  [c.748]

C. Xu and B. E. Koel, J. Chem. Phys., 100, 664 (1994).  [c.748]

C. T. Campbell, B. E. Koel, and K. A. Daube, J. Vac. Sci. Tech., A5, 810 (1987).  [c.750]

M. E. Bartram, R. G. Windham, and B. E. Koel, Surf. ScL, 184, 47 (1987).  [c.755]

Mathematically, the above observation suggests a time-energy uncertainty principle [H]. If the incident frequency is detuned by an amount Aw from resonance with the excited electronic state, the wavepacket can live on the excited state only for a time x s= l/Aw (see figure Al.6.15. This follows from inspection of the integral in equation (Al.6.92) if the incident light frequency is mismatched from the intrinsic frequencies of the evolution operator, there will be a rapidly oscillating phase to the integrand. Nomially, such a rapidly oscillating phase would kill the integral completely, but there is a special effect that comes into play here, since the lower bound of the integral is 0 and not -oo. The absence of contributions from negative t leads to an incomplete cancellation of the portions of the integral around / = 0. The size of the region around / = 0 is inversely proportional to the mismatch in frequencies, Aor. Since the physical significance of t is time delay between incident and scattered photons, and tliis time delay is the effective wavepacket lifetime in the excited state, we are led to conclude that the effective lifetime decreases as the incident frequency is detuned from resonance.  [c.251]

Gericke K-H, Klee S, Comes F J and Dixon R N 1986 J. Chem. Rhys. 85 4463  [c.882]

Goodman D W, Kelley R D, Madey T E and Yates J T Jr 1980 Kinetics of the hydrogenation of CO over a single crystal nickel catalyst J. Catal. 63 226  [c.955]

The adliesion and fiision mechanisms between bilayers have also been studied with the SEA [M, 100]. Kuhl et al [17] found that solutions of short-chained polymers (PEG) could produce a short-range depletion attraction between lipid bilayers, which clearly depends on the polymer concentration (fignre Bl.20.1 It. This depletion attraction was found to mduce a membrane fusion widiin 10 minutes that was observed, in real-time, using PECO fringes. There has been considerable progress in the preparation of fluid membranes to mimic natural conditions in the SEA [ ], which promises even more exciting discoveries in biologically relevant areas.  [c.1742]

Kuhl T Let al 1994 Modulation of interaction forces between bilayers exposing short-chained ethylene oxide headgroups Biophys. J. 66 1479-88  [c.1749]

Kaihel, G., Distillation Columns with Vertical Partitions, Chem. Eng. TechnoL, 10 92, 1987.  [c.157]

Prepared by the dehydration of benzamide. Hydrolysed by dilute acids and alkalis to benzoic acid. Good solvent. benzopheDone,C]3HioO,PhC(0)Ph. Colourless rhombic prisms, m.p. 49 C, b.p. 306°C. Characteristic smell. It is prepared by the action of benzoyl chloride upon benzene in the presence of aluminium chloride (Friedel-Crafts reaction) or by the oxidation of di-phenylmethane. It is much used in perfumery. Forms a kelyl with sodium.  [c.57]

If a situation arises whereby formation fluid or gas enters the bore bole the driller will notice an increase in the total volume of mud. Other indications such as a sudden increase in penetration rate and a decrease in pump pressure may also indicate an influx. Much depends on a quick response of the driller to close in the well before substantial volumes of formation fluid have entered the borehole. Onoe the BOP is closed, the new mud gradient required to restore balance to the system can be calculated. The heavier mud is then circulated in through the kill line and the lighter mud and influx is circulated out through the choke line. Once overbalance is restored, the BOP can be opened again and drilling operations continue.  [c.60]

Aben, H., Idnurm, S., Josepson, J., Kell, K.-J., Puro, A. Optical tomography of the stress tensor field. Proc. SPIE, ISfS "Analytical methods for optical tomography , 1991, 220-229.  [c.138]

Puro, A., Kell, K.-J. Complete determination of stresses in fiber preforms of arbitrary cross section. J. Lightwave Technology. 1992, 10(8) 1010-101f.  [c.138]

Wlodarczyk S., Dybiec Cz., Wlodarczyk W, The application of eddy currents and other techniques for measuring corrosion of metal tanks during exploitation. Materials CCl National Conference about Science and practice in fighting against corrossion , Kule May 1994.  [c.388]

B. E. Koel and G. A. Somoijai, Catalysis Science and Technology, Vol. 38, Springer-Verlag, New York, 1983.  [c.323]

Fig. XVin-5. HREELS spectra for NO2 on Pt(lll) adsorbed in different bonding geometries. [From M. E. Bartram and B. E. Koel, / Vac. Sci. Tech., A6, 782 (1988).] Fig. XVin-5. HREELS spectra for NO2 on Pt(lll) adsorbed in different bonding geometries. [From M. E. Bartram and B. E. Koel, / Vac. Sci. Tech., A6, 782 (1988).]
Fig. XVni-8. (a) Work function change for Pt(lU) as a function of oxygen adatom coverage. From Ref. 82. b) Same, for potassium. The corresponding sequence of LEED structures is indicated. [Reprinted with permission from R. G. Windham, M. E. Bartram, and B. E. Koel, J. Phys. Chem., 92, 2862 (1988) (Ref. 83). Copyright 1988, American Chemical Society.] Fig. XVni-8. (a) Work function change for Pt(lU) as a function of oxygen adatom coverage. From Ref. 82. b) Same, for potassium. The corresponding sequence of LEED structures is indicated. [Reprinted with permission from R. G. Windham, M. E. Bartram, and B. E. Koel, J. Phys. Chem., 92, 2862 (1988) (Ref. 83). Copyright 1988, American Chemical Society.]
If the heating is quickly to a high temperature, or a flashing, all adsorbed gas is removed indiscriminately. If, however, the heating is gradual, then separate, successive desorptions may be observed. Thus, as illustrated in Fig. XVIII-9, hydrogen leaves flat, stepped, and kinked Pt surfaces in stages, indicating the presence of different adsorption sites. The presences of successive desorption stages is fairly common. No less than four are found for H2 chemisorbed on Pd(llO), as shown in Fig. XVIII-10 notice how successive maxima appear with increasing exposure. Xu and Koel [87a] report three different states for NO desorption from Pt(III), possibly due to different bonding geometries (as in Fig. XVlII-5). Yates [88] has reviewed the subject.  [c.696]

B. E. Kole and G. A. Somoijai, in Catalysis Science and Technology, Vol. 38, J. R. Anderson and M. Boudart, eds., Springer-Verlag, New York, 1985.  [c.744]

B. E. Bent, C. M. Mate, J. E. Crowell, B. E. Koel, and G. A. Somoijai, J. Phys. Chem., 91, 1493 (1987).  [c.744]

A. G. Sault and D. W. Goodman, in Advances in Chemical Physics, K. P. Kawley, ed., Wiley, New York, 1989.  [c.754]

Mills I, Cvitas T, Homann K, Kallay N and Kuchitsu K 1993 Quantities, Units and Symbols in Physioal Chemistry 2nd edn (Oxford Blackwell) (3rd edn in preparation)  [c.794]

Overbury S H, Mullins D R, Paffett M T and Koel B E 1991 Surface structure determination of Sn deposited on Pt(111) by low energy alkali ion scattering Surf. Sc/. 254 45-57  [c.1825]

See pages that mention the term Kahweol : [c.39]    [c.51]    [c.162]    [c.230]    [c.385]    [c.41]    [c.746]    [c.747]    [c.189]    [c.319]    [c.763]    [c.888]    [c.1374]    [c.1747]   
See chapters in:

The logic of chemical synthesis  -> Kahweol

The logic of chemical synthesis (1989) -- [ c.204 ]