Results 261 to 270 of about 114,417 (310)

Retroreflector with acute dihedral angles

Optics Letters, 1994
An acute-angle retroreflector having three dihedral angles of 45, 60, and 90 deg was studied by use of the ray-trace method. Incident rays are reflected nine times in the retroreflector, and there are 26 different sequences for reflections. Errors in the dihedral angles will cause the directions of the reflected rays to diverge.
Nobuo Sugimoto, Atsushi Minato
openaire   +3 more sources

Dihedral angles between alveolar septa

Journal of Applied Physiology, 1988
To determine the dihedral angle, alpha, at the characteristic three-way septal junctions of lung parenchyma, we examined photomicrographs of sections. The three angles, A, formed where three septal traces meet on section, were measured and found to range between approximately 50 and 170 degrees. Theoretical considerations predicted that the dispersion
E. H. Oldmixon, F. G. Hoppin, James P. Butler   +2 more
openaire   +3 more sources

Dihedral Angles in Cyclic Molecules

Journal of Structural Chemistry, 2003
The experimental and quantum-chemical values of dihedral angles are analyzed for mono- and bicyclic molecules. Correlations have been found for the bond and dihedral angles.
Lev V. Vilkov, E. G. Atavin
openaire   +2 more sources

Dihedral angles in silicon carbide

Ceramics International, 2003
The commonly accepted hypothesis says that the role of sintering activators such as carbon and boron consists in modifying the relation between the energy of surface and that of grain boundaries in SiC. This means that dihedral angles in samples containing one of the activators, both of them or none should be different.
Ludosław Stobierski, Agnieszka Gubernat
openaire   +2 more sources

THE EXPONENTIAL BEHAVIOUR OF THE GREEN FUNCTION IN A DIHEDRAL ANGLE

Communications in Contemporary Mathematics, 2001
We study the behaviour of the Green function of the heat problem in a dihedral angle with oblique (or Neumann) conditions on the faces. The uniform estimates obtained for the Green function and its derivatives show, in particular, the exponential decay at infinity, as in the parabolic problems in regular domains.
M. G. GARRONI, V. A. SOLONNIKOV, VIVALDI, Maria Agostina   +2 more
openaire   +3 more sources

On the standard deviation of a dihedral angle

Acta Crystallographica Section A, 1974
Expressions for derivatives of a dihedral angle with respect to positional parameters of the atoms involved are presented and their use with the propagation-of-error formula, in evaluating the standard deviation of a dihedral angle, is indicated. The expressions derived are valid in oblique and orthogonal frames of reference.
openaire   +2 more sources

Simulation studies of the dihedral angle in water

The Journal of Physical Chemistry, 1984
Distribution g(δ) de l'angle diedre δ pour des tetranieres et des dimeres, a liaison hydrogene, dans l'eau liquide, pour les modeles MCY et ...
Robin J. Speedy, Mihaly Mezei
openaire   +2 more sources

Toward an understanding of disequilibrium dihedral angles in mafic rocks [PDF]

Journal of Geophysical Research, 2012
The median dihedral angle at clinopyroxene‐plagioclase‐plagioclase junctions in mafic rocks, Θcpp, is generally lower than equilibrium (109° ± 2°). Observation of a wide range of mafic bodies demonstrates that previous work on systematic variations of Θcpp is incorrect in several important respects.
Madeleine C S Humphreys, Rosalind T Helz, Christian Tegner   +2 more
exaly   +6 more sources

The dihedral angle of 2‐(trifluoromethyl)phenothiazine

Journal of Heterocyclic Chemistry, 1976
AbstractThe structure of 2‐(trifluoromethyl)phenothiazine, C13H8NSF3, was determined by single crystal X‐ray diffraction. The molecule crystallizes in space group P212121, with a = 7.766(2), b = 5.957(1), and c = 23.499(5)Å. The final R value is 0.073.
D. W. Phelps, A. W. Cordes
openaire   +2 more sources

Dihedral Angles of the Cycloheptane Ring

Australian Journal of Chemistry, 1988
A method is described for calculating sets of dihedral angles in a seven- membered ring with equal tetrahedral bond angles and equal bond lengths. Representative values are given for the separate chair and boat manifolds of solutions.
openaire   +2 more sources