Plane, planing

DA Property Plane Plane Plane Plane Plane Plane Nonplane ... 

Platsne,/. plane, plane tree, platieren, v.t. plate. 

Figure 4. Contour maps of the electron density of LiCI, BCI3, SCI2 in the av(xz) plane (the plane containing the three nuclei) and in the a/(yz) plane [the plane bisecting ZCI-S-CI perpendicularly to the av(xz) plane], NCI3 in the av plane (plane containing one N-CI bond and bisecting ZCI-N-CI formed by the remaining two bonds), and Cl2. (See legend to Fig. 2 for contour values.)...

Similar, but different, redeployment is envisaged when a carbon atom combines with three other atoms, e.g. in ethene (ethylene) (p. 8) three sp2 hybrid atomic orbitals disposed at 120° to each other in the same plane (plane trigonal hybridisation) are then employed. Finally, when carbon combines with two other atoms, e.g. in ethyne (acetylene) (p. 9) two sp1 hybrid atomic orbitals disposed at 180° to each other (idigonal hybridisation) are employed. In each case the s orbital is always involved as it is the one of lowest energy level. 

Two parallel p orbitals overlap side-by-side to form a pi (tt) bond. Fig. 2-3(u), or a n bond. Fig. 2-3(6). The bond axis lies in a nodal plane (plane of zero electronic density) perpendicular to the cross-sectional plane of the tt bond. 

PLANES OF SYMMETRY. The plane of symmetry is reflection in the plane. Planes of symmetry are often called mirror planes or reflection planes. Some examples of planes of symmetry are shown in Fig. 5.3. Note that it is not sufficient for the two halves of the body to be identical. They must be exact minor images of one another in the plane. Fig. 5.4 illustrates a plane dividing a body into two identical halves which are not minor images of one another in the plane so that the plane is not a plane of symmetry. 

Fig. 1. Brewster angle. A, incident plane (plane of polarization or plane of magnetic vector, after reflection) B, plane of vibration (plane of electric vector, after refleclion) C, reflecting surface (dielectric)...

In /pl e — /Plane //Plane when R species is not initially present) is linear with a slope 26 mV (if T = 298 K) and intercept equal to E 2 This slope is characteristic of reversible charge transfer processes. There are other reversibility criteria based on the difference between potentials Ey4 — F 4. corresponding to the currents /Plane = (3/4)/dpl e and Plme = (1/4)/pl e, with this difference being 56.4 mV (See Chap. 5 of [2] [17] and Fig. 2.4b). 

In that frame, the use of a plane-plane rheometer has been evaluated. The purpose of the experiment carried out in the rheometer is not to mimic fire testing (this is not possible since the heating rate [slow ramp vs. quenching], heating source [convection vs. radiation], sample size, and boundaries effect are different) but to develop a test method that will permit the characterization of the char strength when exposed to pressure (in that case compression force). 

These two limiting forms show an equivalence between the closely approaching-sphere and the planar-block interactions. Ask, what area of the plane-plane interaction is equivalent to the sphere-sphere interaction Equate —[AHam/(12 /2)] L2 = [—(Anam/l2)] (R//) to see that two spheres look like two planes of area L2 = Ibr/. 

Conversely, if we compare the interaction free energy -(Alm/2m/12)(R/Z) of two equal-radius spheres with that of two circular parallel patches of radius R, area jrR2, on facing planes of the same materials in the same medium, we have [-( im/2m/12jr/2)]7rR2 = [-(Alm/2m/12)](R/Z)(R/Z). The plane-plane interaction per unit area is stronger by a variable factor (R/Z) 1. 

The mirror plane (plane of symmetry) (a). If a molecule has a plane that divides it into two halves that are mirror images, the plane is a mirror plane (plane of symmetry). Consider the H20 molecule as shown in Figure 2.15. 

Symmetry planes-plane 2, plane 3, plane 5 do not lead to equivalent position because of the presence of atom 13C at position A. The molecule does not have now centre of symmetry. In other words, introduction 13C has decreased the cyclobutadiene symmetry. 

Condition for Bragg reflection from scattering centers conflned to a set of equidistant, parallel planes. (Planes are perpendicular to the page, their traces are indicated by the horizontal lines.)... 

FIGURE 12.1. Schematic representation of refraction and reflection of a plane electromagnetic wave at a boundary. The surface normal is taken along the z-axis, and the incident beam is assumed to be in the x-z plane (plane of incidence). 

Tlie phase factors for a few atomic planes (planes of constant z) are shown in the figure. Wc must construct a Hamiltonian matrix based upon thc.se six Bloch states for eacli wave number k. The corresponding matrix elements are... 

Plane-polarized light (Section 5.12A) Light that has an electric vector that oscillates in a single plane. Plane-polarized light, also... 

Intramolecular OH bond out of the OOO plane, plane. Intermolecular bond. 

FIGURE 2.13 (cont d). An equatorial plane (plane of projection) is selected, and the points where these lines to the pole touch the equatorial plane are noted (labeled 1 to 5), (c) The points of intersection with the equatorial plane are joined by lines or arcs, (d) The resulting diagram, viewed on the equatorial plane, shows the symmetry of the crystal, cubic in this case, (Courtesy Ernest E. Wahlstrom and John Wiley Sons, Inc. From Wahlstrom, E. E. Optical Crystallography. 5th edn, John Wiley New York, Chichester, Brisbane, Toronto (1979). John Wiley Sons, Inc.)... 

Lattice planes Planes through at least three noncolinear crystal lattice points. 

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