Pattern angle

Slip angle pattern Angle at which a tensioned fiber will slide off the filament wound dome. If the difference between the wind angle and the geodesic angle is less than the slip angle, the fiber will not slide off the dome. Slip angles for different fiber-plastic systems vary and must be determined experimentally. 

To understand better Grinding with the F pattern will always correct the service profile in the direction of the target profile. By a curious tangential effect of the contact between the plane end of the grinding wheel and the rail, the grinding action concentrates on excess metal. The profile is progressively improved until the F pattern angles produce the required shape. 

When one designs cyclones, the cone diameters, Dd and Dc2, and the height of the cone. He-, or cone angle, / , are normally known. Given these, one can then compute the cone lengths or radii l and + 2 (shown in Fig. 15.1.8) and the 2-dimensional pattern angle 0. The values for li and + 2 are given by the equations ... 

Fig. 15.1.8. Cyclone cone geometry and its construction pattern The pattern angle 6 is given by ...

Axes of symmetry. An axis about which rotation of the body through an angle of 2njn (where n is an integer) gives an identical pattern 2-fold, 3-fold, 4-fold and 6-fold axes are known in crystals 5-fold axes are known in molecules. In a lattice the rotation may be accompanied by a lateral movement parallel to the axis (screw axis). 

A planar calibration pattern is placed in front of the image intensiher tube to calculate the distortion parameters. The calibration marks are arranged in a regular, right angled... 

First, the plane n(x,y) coincides with the diffuser mean plane of G, IT (x ,y ). When G is translated a distance x and rotated an angle Aa respect to the y axis of Il (x ,y ), we ob-a null movement of the speckle pattern on a circumference of center C and radius R ... 

For conventional probes, acoustic verification aims at characterizing the beam pattern, beam crossing, beam angle, sensitivity, etc., which are key characteristics in the acoustic interaction between acoustic beam and defect. For array transducers, obviously, it is also a meaning to check the acoustic capabilities of the probe. That is to valid a domain (angle beam, focus, etc.) in which the probe can operate satisfactorily. 

The diffraction pattern consists of a small number of spots whose symmetry of arrangement is that of the surface grid of atoms (see Fig. IV-10). The pattern is due primarily to the first layer of atoms because of the small penetrating power of the low-energy electrons (or, in HEED, because of the grazing angle of incidence used) there may, however, be weak indications of scattering from a second or third layer. 

The ESDIAD pattern does, however, provide very usefril infomiation on the nature and synnnetry of an adsorbate. As an example, figure A1.7.13(a) shows the ESDIAD pattern of desorbed collected from a 0.25 ML coverage of PF on Ru(OOOl) [89]. The pattern displays a ring of emission, which indicates that the molecule adsorbs intact and is bonded tlirough the P end. It freely rotates about the P-Ru bond so that tlie emission occurs at all azimuthal angles, regardless of the substrate structure. In figure A1.7.13(b), the... 

Powder diffraction studies with neutrons are perfonned both at nuclear reactors and at spallation sources. In both cases a cylindrical sample is observed by multiple detectors or, in some cases, by a curved, position-sensitive detector. In a powder diffractometer at a reactor, collimators and detectors at many different 20 angles are scaimed over small angular ranges to fill in the pattern. At a spallation source, pulses of neutrons of different wavelengdis strike the sample at different times and detectors at different angles see the entire powder pattern, also at different times. These slightly displaced patterns are then time focused , either by electronic hardware or by software in the subsequent data analysis. 

In this section, we concentrate on the relationship between diffraction pattern and surface lattice [5], In direct analogy with the tln-ee-dimensional bulk case, the surface lattice is defined by two vectors a and b parallel to the surface (defined already above), subtended by an angle y a and b together specify one unit cell, as illustrated in figure B1.21.4. Withm that unit cell atoms are arranged according to a basis, which is the list of atomic coordinates within drat unit cell we need not know these positions for the purposes of this discussion. Note that this unit cell can be viewed as being infinitely deep in the third dimension (perpendicular to the surface), so as to include all atoms below the surface to arbitrary depth. 

Figure Bl.21.4. Direct lattices (at left) and reciprocal lattices (middle) for the five two-dimensional Bravais lattices. The reciprocal lattice corresponds directly to the diffraction pattern observed on a standard LEED display. Note that other choices of unit cells are possible e.g., for hexagonal lattices, one often chooses vectors a and b that are subtended by an angle y of 120° rather than 60°. Then the reciprocal unit cell vectors also change in the hexagonal case, the angle between a and b becomes 60° rather than 120°.

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