Spall


The kelly is hung from the travelling block. Since the latter does not rotate, a bearing is required between the block and the kelly. This bearing is called a swivel. Turning the drill string in a deep reservoir would be equivalent to transmitting torque through an everyday drinking straw dangling from the edge of a 75 storey high rise building As a result, all components of the drill string are made of high quality steels.  [c.38]

Having been cleaned, the mud is transferred into mud tanks, large treatment and storage units. From there a powerful pump brings the mud up through a pipe stand pipe) and through a hose connected to the swivel (rotary hose) forcing it down the hole inside the drill string. Eventually the cleaned mud will exit again through the bit nozzles.  [c.39]

Other compounds which may be found in crude oil are metals such as vanadium, nickel, copper, zinc and iron, but these are usually of little consequence. Vanadium, if present, is often distilled from the feed stock of catalytic cracking processes, since it may spoil catalysis. The treatment of emulsion sludges by bio-treatment may lead to the concentration of metals and radioactive material, causing subsequent disposal problems.  [c.94]

C. A. Bunton and G. Savelli, Adv. Phys. Org. Chem., 22, 213 (1986).  [c.497]

Fig. XV-10. Illustration of a bilayer membrane and two of its deformation modes (a) twist (b) splay. (From Ref. 75.) Fig. XV-10. Illustration of a bilayer membrane and two of its deformation modes (a) twist (b) splay. (From Ref. 75.)
King, 1971 Naphtali and Sandholm, 1971 Newman, 1963 and Tomich, 1970). Moreover the choice of appropriate computation procedures for distillation, absorption, and extraction is highly dependent on the system being separated, the conditions of separation, and the specifications to be satisfied (Friday and Smith, 1964 Seppala and Luus, 1972). The thermodynamic methods presented in Chapters 3, 4, and 5, particularly when combined to  [c.110]

Figure 6.30 shows the grand composite curve plotted from the problem table cascade in Fig. 6.186. The starting point for the flue gas is an actual temperature of 1800 C, which corresponds to a shifl ed temperature of (1800 — 25) = mS C on the grand composite curve. The flue gas profile is not restricted above the pinch and can be cooled to pinch temperature corresponding to a shifted temperature of 145 C before venting to the atmosphere. The actual stack temperature is thus 145 + 25= 170°C. This is just above the acid dew point of 160 C. Now calculate the fuel consumption Figure 6.30 shows the grand composite curve plotted from the problem table cascade in Fig. 6.186. The starting point for the flue gas is an actual temperature of 1800 C, which corresponds to a shifl ed temperature of (1800 — 25) = mS C on the grand composite curve. The flue gas profile is not restricted above the pinch and can be cooled to pinch temperature corresponding to a shifted temperature of 145 C before venting to the atmosphere. The actual stack temperature is thus 145 + 25= 170°C. This is just above the acid dew point of 160 C. Now calculate the fuel consumption
The steps of image processing used in the examinations displayed in figures 3 a to 3d. Figure 3a shows the original X-ray image of a sample spot in 60°-angle arrangement with the laser induced molten bath and hard particles. The following image (figure 3b) is the result of a contrast and brilliance correction. The setting of a defined treshold leads to the segmentation of the hard particles from the image background (figure 3c). Figure 3d shows a Laplace-filtered image as an example for further possibilities to emphasize the particles. A similar effect is given e.g. by Sobel filtering.  [c.546]

In order to build up a strong and effective inii tructure of local NDT practitioners at international standards, the NDT training programme has been taken up in Bangladesh. Through this training programme, approximately 100 trained and skilled NDT personnel are available aho can cater all NDT services to our national industries with the available NDT equipment and materials. All the five NDT methods are being used very successfully by the local NDT practitioners in the industries. So foreign contract for any NDT work in our industries is not required at the moment. But in view of increasing activities in the industrial sectors, these will not commensurate with actual reqttirement within a short spell of time until adequate steps are taken for improvement of required magnitude dimension of these facih ties.  [c.919]

BE-1702 Validation, expansion and standardisation of procedures for high temperature Dr. 1. Shibli ERA Technology Ltd  [c.936]

T. Sevel, NH. Pedersen, C.E. Weinell, B. Lind-Nielsen, North Sea Flow Measurements Workshop, 1996, Peebles, Scotland  [c.1060]

If the dependence on temperature as well as on composition is known for a solution, enthalpies and entropies of adsorption may be calculated from the appropriate thermodynamic relationships [82]. Neam and Spaull [147] have, for example, calculated the enthalpies of surface adsorption for a series of straight-chain alcohols. They find an increment in enthalpy of about 1.96 kJ/mol per CH2 group.  [c.91]

F. Brochard-Wyart and P. G. de Gennes, J. Phys. Cond. Matter, 6, 23A(suppl.), A9-A12 (1994).  [c.492]

One of the major sueoesses of energy band theory is that it ean be used to prediet whether a erystal exists as a metal or insulator. If a band is filled, the Pauli prineiple prevents eleetrons from ehanging tlieir momentum in response to the eleetrie field as all possible momentum states are oeeupied. In a metal this eonstraint is not present as an eleetron ean ehange its momentum state by moving from a filled to an oeeupied state within a given band. The distinet types of energy bands for insulators, metals, semieonduetors and semimetals are sehematieally illustrated in figure Al.3.8. In an insulator, energy bands are either eompletely empty or eompletely filled. The band gap between the highest oeeupied band and lowest empty band is large, e.g. above 5 eV. In a semieonduetor, the bands are also eompletely filled or empty, but the gap is smaller, e.g. below 3 eV. In metals bands are not eompletely oeeupied and no gap between filled and empty states oeeiirs. Semimetals are a speeial ease. No gap exists, but one band is almost eompletely oeeupied it overlaps with a band that is almost eompletely empty.  [c.105]

Three other examples of liquid-gas phase diagrams for a two-eomponent system are illustrated in figure A2.5.5 all a result of deviations from ideal behaviour. Sueh deviations in the liquid mixture ean sometimes produee azeotropie behaviour, in whieh there are maximum or minimum boiling mixtures (shown in figure A2.5.5(a) and figure A2.5.5(b)). Exeept at the azeotropie eomposition (that of the maximum or minimum), a eonstant-eomposition path through the vaporization yields the same kind of qualitative behaviour shown in figure A2.5.4. Behavior like that shown in figure A2.5.2 is found only on the speeial path tlirough the maximum or minimum, where the entire vaporization proeess oeerirs at a unique temperature.  [c.615]

In equation (bl. 15.7) p(co) is tlie frequeney distribution of the MW radiation. This result obtained with explieit evaluation of the transition matrix elements oeeurring for simple EPR is just a speeial ease of a imieh more general result, Femii s golden mle, whieh is the basis for the ealeulation of transition rates in general  [c.1550]

There are some speeial teelmiques that ean be used with the NMP, speeifieally seaiming transmission ion mieroseopy (STIM). In this ease the bombarding ion beam is allowed to penetrate tlirough a thin sample and the energies of the transmitted ions are measured. As the energy loss of the ions tlirough the sample is direetly proportional to the amount of material traversed, the sample thiekness ean be imaged with very high  [c.1845]

MW em and GW em Speeial lasers used in nuelear frision experiments may even reaeh 10 W em [78, 79]. Ideally the monoehromatieity, Av, is related to the pulse length. At, tlirough  [c.2136]

The fonnation of reaetive speeies by photodissoeiation of a preeursor tlnough flash photolysis ean be regarded as a speeial ease of ehemieal aetivation. More generally, this teelmique exploits the enthalpy of a ehemieal reaetion to generate speeies with a non-equilibrium energy distribution (relative to the ambient temperature). Using different reaetions to produee the same reaetive speeies allows one to study the energy dependenee of the ensuing reaetion kineties (or eollisional deaetivation). Flistorioally, the method has played a eentral role in the experimental study of eollisional energy-transfer proeesses and non-equilibrium effeets on ehemieal reaetion rates [83, M, M, and 87].  [c.2138]

Gott Y V, Ioffe M S and Telkovsky V G 1962 Nuclear Fusion Suppl. part 3 (Vienna International Atomio Energy Agenoy) p 1045  [c.2480]

Pirotta M, Renn A, Werts M FI V and Wild U P 1996 Single molecule spectroscopy. Perylene in the Shpol skii matrix n-nonane Chem. Phys. Lett. 250 576-82  [c.2507]

Pirotta M, Guttler F, Gygax FI, Renn A, Sepiol J and Wild U P 1993 Single molecule spectroscopy fluorescence lifetime measurements of pentacene in p-terphenyl Chem. Phys. Lett. 208 379-84  [c.2508]

Guttler F, Sepiol J, Plakhotnik T, Mitterdorfer A, Renn A and Wild U P 1993 Single molecule spectroscopy fluorescence excitation spectra with polarized light J. Lumin. 56 29-38  [c.2508]


See pages that mention the term Spall : [c.129]    [c.207]    [c.233]    [c.234]    [c.39]    [c.156]    [c.37]    [c.41]    [c.987]    [c.1053]    [c.1060]    [c.100]    [c.2]    [c.41]    [c.131]    [c.339]    [c.617]    [c.1132]    [c.1221]    [c.1224]    [c.1661]    [c.2143]    [c.2291]    [c.2381]    [c.2505]    [c.2507]    [c.2507]   
Solids under high-pressure shock compression - mechanics, physics, and chemistry (1992) -- [ c.45 , c.46 ]