scholarly journals Long Wave Length Excitations in Superfluid He4 Films

1979 ◽  
Vol 61 (4) ◽  
pp. 983-995
Author(s):  
H. Kawamoto ◽  
T. Ohmi
Keyword(s):  
Wave Length ◽  
Long Wave

Wave Forces on a Stationary Platform of Elliptical Shape

1973 ◽  
Vol 17 (02) ◽  
pp. 61-71
Author(s):  
H. S. Chen ◽  
C. C. Mei
Keyword(s):  
Diffraction Problem ◽  
Wave Length ◽  
Practical Interest ◽  
Vertical Cylinder ◽  
Present Theory ◽  
Wave Forces ◽  
Mathieu Functions ◽  
Body Type ◽  
Elliptical Cross ◽  
Long Wave

Exciting forces and moments due to plane incident waves on a stationary platform are studied in this paper. The platform is a vertical cylinder with a finite draft and elliptical cross section. The mathematical solution to the diffraction problem is obtained on the basis of the linearized long wave approximation. Numerical results via Mathieu functions are presented for a shiplike body with beam-to-length ratio Various draft-to-depth ratios and angles of incidence are considered. Results have been checked with the limiting case of a circular cylinder for the long-wave length range. Aside from its own practical interest, the present theory provides a basis for comparison with other approximate theories of slender-body type and serves as a prelude to the corresponding calculations for arbitrary wavelengths.

scholarly journals Radiation torque on a spherical birefringent particle in the long wave length limit: analytical calculation

2005 ◽  
Vol 13 (14) ◽  
pp. 5192 ◽  
Author(s):  
Nian Ji ◽  
Mengkun Liu ◽  
Jihao Zhou ◽  
Zhifang Lin ◽  
S. T. Chui
Keyword(s):  
Wave Length ◽  
Analytical Calculation ◽  
Long Wave

scholarly journals Study the Effect of solvent on the Optical Properties Performance of active polymeric laser media

2007 ◽  
Vol 4 (3) ◽  
pp. 387-392
Author(s):  
Baghdad Science Journal
Keyword(s):  
Absorption Spectrum ◽  
Pure Water ◽  
Wave Length ◽  
Blue Shift ◽  
Short Wave ◽  
Fluorescence Yield ◽  
Effect Of Solvent ◽  
Long Wave ◽  
Short Wave Length ◽  
Laser Media

The paper include studies the effect of solvent of dye doped in polymeric laser sample which manufactured in primo press way, which is used as an active (R6G) tunable dye lasers. The remarks show that, when the viscosity of the solvent (from Pure Water to Ethanol), for the same concentration and thickness of the performance polymeric sample is increased, the absorption spectrum is shifts towards the long wave length (red shift), & towards short wave length (blue shift) for fluorescence spectrum, also increased the quantum fluorescence yield. The best result we obtained for the quantum fluorescence yield is (0.882) with thickness (0.25mm) in Ethanol solvent in concentration (2*10-3mole/liter), while when we used the Pure Water as a solvent, we found that the best quantum fluorescence yield is (0.72) at the same thickness & concentration of the sample.

Defect Mediated and Resonant Optical Excitation of Er3+ Ions in Silicon-rich Silicon Oxide

2003 ◽  
Vol 770 ◽  
Author(s):  
D. Kuritsyn ◽  
A. Kozanecki ◽  
H. Przybylińska ◽  
W. Jantsch
Keyword(s):  
Silicon Oxide ◽  
Excitation Cross Section ◽  
Wave Length ◽  
Optical Excitation ◽  
Excitation Band ◽  
Electrical Excitation ◽  
Long Wave ◽  
Distance Dependence ◽  
Large Enhancement ◽  
Wide Energy

AbstractWe study sensitization of the 4I13/2 – 4I15/2 Er3+ luminescence at 1.54 μm in silicon-rich silicon oxide (SRSO) in the whole range of blue-green pump wavelengths. We show that, in general, defects due to excess Si in silica act as luminescence sensitizers. They cause a wide excitation band with a long wave length limit of 600 nm. For monochromatic excitation the maximum luminescence yield is still smaller than for resonant excitation within the 4f shell of Er without additional Si. The large enhancement of the excitation cross section for electrical excitation reported in the literature is plausible, however, as the wide excitation band makes good use of the wide energy distribution of hot carriers. We suggest that the dominant factors, which limit the excitation efficiency of Er3+, are distance dependence of the transfer rate and little spectral overlap of the interacting states.

Long Wave-Length Buckling of Periodic Open-Cell Foams Subjected to Uniaxial Compression

2007 ◽  
Vol 345-346 ◽  
pp. 81-84
Author(s):  
Dai Okumura ◽  
Atsushi Okada ◽  
Nobutada Ohno
Keyword(s):  
Finite Element ◽  
Uniaxial Compression ◽  
Wave Length ◽  
Elastic Buckling ◽  
Element Analysis ◽  
Open Cell ◽  
Long Wavelength ◽  
Onset Condition ◽  
Long Wave ◽  
Open Cell Foams

In this study, the elastic buckling strength of cubic open-cell foams subjected to uniaxial compression is investigated using the homogenization framework developed by the present authors (Ohno et al., JMPS 2002; Okumura et al., JMPS 2004). First of all, based on the framework, the microscopic bifurcation and macroscopic instability of cubic open-cell foams are numerically analyzed by performing finite element analysis. It is thus shown that long wavelength buckling is the primary mode and occurs just after the onset of macroscopic instability. Then, a solution for predicting the stress of long wavelength buckling is analytically derived from the onset condition of macroscopic instability. The validity of this analytical solution is demonstrated by the finite element results.

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