Now showing items 11-20 of 3696
Fundamental Aspects of Episodic Accretion Chemistry Explored with Single-point Models
(IOP Publishing, 2012)
We explore a set of single-point chemical models to study the fundamental chemical aspects of episodic accretion in low-mass embedded protostars. Our goal is twofold: (1) to understand how the repeated heating and cooling ...
Ionization Rates in (AlxGa1−x)As
(The American Institute of Physics, 1970-10)
The ionization rates of (AlxGa1−x) As have been measured as a function of the Al content and the results are presented here. Values of both A and b are found to increase with Al content. It is also found that for low values ...
Optimum separate confinement structure for midinfrared HgCdTe heterostructure lasers
(The American Institute of Physics, 1992-09-01)
A study for the optimization of HgCdTe heterostructure lasers for applications as midinfrared wavelength sources has been carried out. Structures are examined to emit photons at 2.5 and 4.5 μm at 77 K. For the 2.5 μm case, ...
Measurements of molecular hyperpolarizabilities for ethylene, butadiene, hexatriene, and benzene
(The American Institute of Physics, 1978-12-15)
Third‐order polarizabilities are measured in the gas phase using dc electric‐field induced optical second‐ harmonic generation and are found to be positive in each case.
Two-fluid atmosphere for relativistic stars
(IOP Publishing Ltd, 1999-04-01)
We have extended the Vaidya radiating metric to include both a radiation fluid and a string fluid. This paper expands our brief introduction to extensions of the Schwarzschild vacuum which appeared in 1998 Phys. Rev. D ...
The Role of Environment in Low-level Active Galactic Nucleus Activity: No Evidence for Cluster Enhancement
(IOP Publishing, 2012)
We use the AMUSE-Virgo and AMUSE-Field surveys for nuclear X-ray emission in early-type galaxies to conduct a controlled comparison of low-level supermassive black hole activity within cluster and field spheroids. While ...
Space-charge-limited flows in the quantum regime
(The American Institute of Physics, 2006-05)
This paper reviews the recent developments of space-charge-limited (SCL) flow or Child-Langmuir (CL) law in the quantum regime. According to the classical CL law for planar diodes, the current density scales as 3/23∕2’s ...
Ultrasound detection using polymer microring optical resonator
(The American Institute of Physics, 2004-11-29)
Application of polymer waveguide microring resonators for high-frequency ultrasound detection is presented. The device consists of a microring optical resonator coupled to a straight optical waveguide which serves as input ...
Density and Current Density as Coordinates for a System of Interacting Bosons at Absolute Zero
(The American Institute of Physics, 1971-06)
The quantum field Hamiltonian expressed in terms of density and current density variables has been employed together with the equal‐time commutation relations among these variables to find the ground state energy and the ...