Now showing items 1021-1030 of 1043
Spatial monomer distribution for a flexible polymer in a good solvent
(The American Institute of Physics, 1981-02-15)
We calculate the fourth moment 〈r4〉 of the average monomer–monomer separation in a flexible linear polymer in the excluded volume limit. The ratio 〈r4〉/〈r2〉2 is a universal number expressible in terms of the exponents γ ...
Dynamics of phase‐locked semiconductor laser arrays
(The American Institute of Physics, 1988-05-23)
Time‐dependent coupled mode theory is used to investigate the stability of phase‐locked semiconductor laser arrays. The output of individual array elements is dynamically unstable and exhibits large amplitude chaotic ...
On the interaction of vortex rings and pairs with a free surface for varying amounts of surface active agent
(The American Institute of Physics, 1989-12)
Observations are reported of the interaction with a free surface of vortex rings and vortex pairs moving normal to the surface when different amounts of surface active agents are present on the surface. At a vortex ring ...
The thermodynamics of ammonium scheelites. III. An analysis of the heat capacity and related data of deuterated ammonium perrhenate ND4ReO4
(The American Institute of Physics, 1986-11-15)
An analysis of the heat capacity of deuterated and undeuterated NH4ReO4 has been carried out in which the effects of the anisotropy of the thermal expansion have been considered, an approach hitherto not used for ammonium ...
Production of intense, coherent, tunable narrow‐band lyman‐alpha radiation
(The American Institute of Physics, 1988-10-01)
Nearly transform limited pulses of 1216 Å radiation have been generated by sum frequency generation in 0.1 to 10 torr of mercury vapor. The summed input beams, consisting of photons at 3127 Å and 5454 Å originate in 1 MHz ...
Spectroscopic measurements of He2 in the afterglow of a dense Z‐pinch plasma
(The American Institute of Physics, 1986-03-15)
Visible emission spectroscopy (330–650 nm) has been performed radially and axially on a Z‐pinch plasma. During the peak compression, continuum and He ii line emission (468.6 nm) predominated. We report the first observation ...
Spin-polarized low-energy positron beams and their applications
(Springer-Verlag, 1987-08)
The production and use of low-energy (100 eV to 5 keV) high-intensity, spin-polarized positron beams is reviewed. Methods for obtaining beams with high polarization are discussed. Applications include studies of the ...
Search for polarization in Ξ0 hyperons
(The American Institute of Physics, 1983-03-15)
Inclusive hyperon production by 400 GeV protons at Fermilab has shown that the hyperons are produced with significant polarization. However no polarization has been seen for Λ’s produced at these energies. In this paper ...
Molecular beam epitaxial GaAs optical detectors on silica fibers
(The American Institute of Physics, 1988-05-23)
By using molecular beam epitaxy and post‐growth annealing techniques, we have successfully made GaAs interdigitated photoconductive detectors on D‐shaped silica fibers. The detectors exhibit low leakage current and internal ...
Neutrino astrophysics with IMB: past, present, and future
(Elsevier, 1988-03)
A burst of eight neutrino interactions occurring over a six second interval had been observed with the IMB detector. The closeness in time of the burst to the optical discovery of Supernova 1987a suggests that the neutrinos ...