Three-body components of collision-induced absorption in the infrared

Three-body components of collision-induced absorption

Physical Review A ◽

10.1103/physreva.40.6260 ◽

1989 ◽

Vol 40 (11) ◽

pp. 6260-6274 ◽

Cited By ~ 26

Author(s):

Massimo Moraldi ◽

Lothar Frommhold

Keyword(s):

Induced Absorption ◽

Body Components ◽

Three Body

Download Full-text

QCD sum rule calculation of quark-gluon three-body components in the B-meson wave function

10.1063/1.3647413 ◽

2011 ◽

Author(s):

Tetsuo Nishikawa ◽

Kazuhiro Tanaka ◽

Atsushi Hosaka ◽

Kanchan Khemchandani ◽

Hideko Nagahiro ◽

...

Keyword(s):

Wave Function ◽

B Meson ◽

Meson Wave Function ◽

Sum Rule ◽

Body Components ◽

Three Body

Download Full-text

Effect of Finite Rotations on Gyroscopic Sensing Devices

Journal of Applied Mechanics ◽

10.1115/1.4011746 ◽

1958 ◽

Vol 25 (2) ◽

pp. 210-213

Author(s):

L. E. Goodman ◽

A. R. Robinson

Keyword(s):

Angular Velocity ◽

Three Dimensional ◽

Time History ◽

Simple Method ◽

Finite Rotations ◽

Actual Solution ◽

History Of ◽

Body Components ◽

Guidance Systems ◽

Three Body

Abstract The well-known noncommutativity of three-dimensional finite rotations has long been a curiosity in mechanics since, in actual solution of dynamical problems, the angular velocity, which is conveniently representable as a vector, plays a more natural role. In modern inertial guidance systems, however, the orientation of a body in space, i.e., a rotation, is of primary engineering interest. In this paper a simple method of determining orientation from the time history of three body components of angular velocity is developed by means of a new theorem in kinematics. As a special case of this theorem it is shown that a gyro subjected to a regime of rotations which returns it to the original space orientation will, in general, produce a residual signal. It will have experienced a nonzero and easily calculated mean angular velocity about its input axis. Some implications of the theorem for the design of inertial guidance systems and for the testing of gyros are discussed.

Download Full-text

Collision Induced Absorption in N2, CO2, and H2 at 2.3 cm−1

Canadian Journal of Physics ◽

10.1139/p75-225 ◽

1975 ◽

Vol 53 (18) ◽

pp. 1764-1776 ◽

Cited By ~ 18

Author(s):

I. R. Dagg ◽

G. E. Reesor ◽

J. L. Urbaniak

Keyword(s):

Microwave Absorption ◽

Loss Factor ◽

Relaxation Times ◽

Virial Coefficients ◽

Low Frequency ◽

Frequency Region ◽

Induced Absorption ◽

Three Body ◽

Initial Measurement

Collision induced microwave absorption is reported in pure N2, CO2, and H2 in the region of 2.3 cm−1. For N2 the results are taken at temperatures ranging from 208 to 333 K and at densities ranging from 50 to 300 amagat. The parts of the loss factor which are proportional to the square and the cube of the density are found to depend respectively on T−1.55±0.12 and T−2.56±0.44. These results are well explained by the theory which relates the virial coefficients and relaxation times to the loss factor. Both the two and three body relaxation times, τ2 and τ3 follow very closely a T−0.5 dependence. The ratio of τ2/τ3 is found to be 0.83. For CO2 the results are taken at temperatures ranging from 273 to 363 K and at densities ranging from 8 to 80 amagat. The parts of the loss factor which are proportional to the square and cube of the density depend respectively on T−3.08±0.05 and T−5.4±0.059. These results together with existing infrared results show that τ2 is nearly proportional to T−0.5 and the ratio τ2/τ3 is 0.91 at 296 K. An initial measurement is reported for collision induced absorption in H2. The results for all three gases have been compared to previously reported results in the low frequency region.

Download Full-text

Growth patterns in sheep: changes in the chemical composition of the empty body and its constituent parts during weight loss and compensatory growth

The Journal of Agricultural Science ◽

10.1017/s0021859600043288 ◽

1984 ◽

Vol 103 (1) ◽

pp. 17-24 ◽

Cited By ~ 9

Author(s):

B. W. Butler-Hogg

Keyword(s):

Weight Loss ◽

Body Weight ◽

Chemical Composition ◽

Chemical Constituents ◽

Growth Patterns ◽

The Body ◽

Control Group ◽

Relative Contribution ◽

Body Components ◽

Three Body

SummaryChemical compositional (protein, fat, ash and water) changes in the fleece-free empty body, carcass, viscera and ‘remainder’ components of Corriedale wether sheep were measured by serial slaughter of animals following five different growth paths.The composition of sheep, after losing up to 34% of body weight over 18 weeks at 125 g/day, was significantly different from a continuously growing control group at the same body weight, but the actual differences in the weights of tissues were small. At the end of weight loss all treatment sheep contained more fat and protein, and less water than controls.The different growth paths followed during weight loss led to differences in the proportions of protein, fat, ash and water lost and to differences between the three body components in the relative contribution made by each.The periods of weight loss led to changes in the relative growth coefficients for chemical constituents during realimentation, particularly those of fat and ash which were reduced, and of water which was increased.The response to realimentation differed between body components, particularly the carcass and viscera. Above the body weight at which weight loss was imposed the realimented sheep did not differ in chemical composition from the continuously ad libitum fed controls when compared at the same weight.

Download Full-text

Rototranslational absorption in gaseous H2–Ar mixtures at intermediate densities

Canadian Journal of Physics ◽

10.1139/p89-109 ◽

1989 ◽

Vol 67 (6) ◽

pp. 599-604 ◽

Cited By ~ 7

Author(s):

P. Dore ◽

A. Filabozzi ◽

G. Birnbaum

Keyword(s):

Absorption Spectrum ◽

Low Density ◽

Density Range ◽

Line Profiles ◽

Induced Absorption ◽

Density Limit ◽

Density Effects ◽

Low Density Limit ◽

Experimental Values ◽

Three Body

We present the measurements and analysis of the density effects on the rototranslational absorption spectrum of H2–Ar mixtures, for densities up to about 200 amagat. This density range is intermediate between the low-density limit, in which the spectrum is due to binary interactions, and the high-density range, in which density produces the so-called density-narrowing effect, which was studied previously. We find in the density range currently explored that density (ρ) effects are clearly evident and are well accounted for by considering a negative ρ3 contribution to the absorption besides the dominant ρ2 contribution. Experimental values of the two-body and three-body zeroth moments are obtained. We also obtain experimental line profiles for these two contributions. Even if the accuracy of the ρ3 profile is low, this work presents the first ρ3 line determined from measurements of collision-induced absorption.

Download Full-text