Cone angles

Reconstruction in Spiral Cone-Beam CT at small Cone-Angles... 

In order to prepare the system for 3D-CT, it is not enough to integrate a second detector array. Besides this special attention has to be paid to the computer hardware, the synchronisation between object movement and the data read out as well as to the collimator of the LINAC. The collimator has been built with 4 tungsten blocks which can be moved individually m order to shape different sht sizes for 2D-CT as well as different cone angles for 3D-CT or digital radiography. 

STM and AFM profiles distort the shape of a particle because the side of the tip rides up on the particle. This effect can be corrected for. Consider, say, a spherical gold particle on a smooth surface. The sphere may be truncated, that is, the center may be a distance q above the surface, where q < r, the radius of the sphere. Assume the tip to be a cone of cone angle a. The observed profile in the vertical plane containing the center of the sphere will be a rounded hump of base width 2d and height h. Calculate q and r for the case where a - 32° and d and h are 275 nm and 300 nm, respectively. Note Chapter XVI, Ref. 133a. Can you show how to obtain the relevent equation ... 

Phosphites, such as triisopropyl and triphenyl phosphite, are weaker electron donors than the corresponding phosphines, but they are used in some reactions because of their greater rr-accepting ability. The cyclic phosphite trimethylol-propane phosphite (TMPP) or 4-ethyl-2,6,7-trioxa-l-phosphabicyclo[2.2.2]oc-tane (8), which has a small cone angle and small steric hindrance, shows high catalytic activity in some reactions It is not commercially available, but can be prepared easily[27]. 

Conduit Cone angle Cone crushers Cone nulls... 

A spheroconical diamond indenter having a 120° included cone angle. 

Venturi Meters The standard Herschel-type venturi meter consists of a short length of straight tubing connected at either end to the pipe line by conic sections (see Fig. 10-15). Recommended proportions (ASME PTC, op. cit., p. 17) are entrance cone angle Oti = 21 2°, exit cone angle Cto = 5 to 15°, throat length = one throat diameter, and upstream tap located 0.25 to 0.5 pipe diameter upstream of the entrance cone. The straight and conical sections should be joined by smooth cui ved surfaces for best results. 

Pipe size, in (mm) Pipe outside diameter, in (mm) Cone outside diameter, in (mm) Wall thickness, in (mm) Cone angle. Approximate weight per foot, lb (kg)... 

The sharpness of separation of the mineral from the gangue is dependent on (1) the stability of the suspension, which is influenced by the size of the medium (2) the specific gravity of the medium (3) the cleanliness of the medium (4) the cone angle (5) the size and ratios of the internal openings in the cyclone (inlet, apex, and vortex) and (6) the pressure at which the pulp is introduced into the cyclone. A 20° cone angle is the most common. Cyclone diameter will be determined by the separation to be made as well as by the capacity required. The 0.5- and 0.6-m (20- and 24-in) cyclones are most common in coal plants, whereas multiple cones of 0.25- or 0.3-m (10- or 12-in) diameter are used in higher-gravity separations. 

Fig. 9. A, Model for the apex of a carbon nanocone with a cone angle of 19.2 [94] B, polyhedral and spherical forms of a multiwall carbon particle formed from and...

Using SI units, and from some literature reported values for hydroclones with D between 125 and 600 ram, and a cone angle of 38°, a value for coefficient K is 2.8 X 10. The maximum size of particles in the cleared liquid can be estimated from ... 

Nanocones of carbon are found[3] in some areas on the substrate together with tubes and other mesoscopic structures. In Fig. 7 two carbon cones are displayed. For both cones we measure opening angles of 19.0 0.5°. The cones are 240 A and 130 A long. Strikingly, all the observed cones (as many as 10 in a (800 A) area) have nearly identical cone angles -19°. 

Cone angles and throat depth dictate the bit best suited for stabilization. Cone angles are steep (60° to 70°), medium (80° to 90°), flat (100° to 120°), best suited for highly stable, stable and for fracturing formation, respectively. 

Complexes of trimethylphosphine (cone angle 118°) [115]. Syntheses are shown in Figure 2.63. The rhodium(III) complexes can be made by the usual routes or by oxidation of rhodium(I) complexes. Note that in contrast with the bulkier PPh3, refluxing RhCl3 with PMe3 does not result in reduction. 

Complexes of triisopropylphosphine (cone angle 160°) [69, 117]. In contrast to less bulky trialkylphosphines, a complex RhCl3(PPr3)3 has only been made by reaction at 0°C at higher temperatures, hydrides like RhHCl2(PPr 3)2 result (the less bulky tri(n-propyl)phosphine gives the 3 1 complex at reflux). 

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