Now showing items 11-20 of 30
Concentration dependence of diffusion coefficient at various molecular weights and temperatures
(Elsevier, 1981-09)
The effect of temperature on the concentration dependence of the diffusion coefficient D(c) is investigated experimentally by light scattering using polystyrene with Mw = 179 000 and 900 000 in toluene and cyclohexane at ...
Benchmark results for particle transport in a binary Markov statistical medium
(Elsevier, 1989-10)
We give numerical benchmark results for particle transport in a randomly mixed binary medium, with the mixing statistics described as a homogeneous Markov process. A Monte Carlo procedure is used to generate a physical ...
Soft X-ray emission from a CO 2 laser-heated Z-pinch plasma
(Kluwer Academic Publishers-Plenum Publishers; Plenum Publishing Corporation ; Springer Science+Business Media, 1987-09)
We report results of soft X-ray measurements in which a high-power (10 10 –10 11 W/cm 2 ) CO 2 laser was used to heat a near critical density (<10 19 cm −3 ) helium Z-pinch plasma. Frequency-integrated X-ray data show that ...
Cold neutron prompt gamma activation analysis at nist: A progress report
(Kluwer Academic Publishers; Akadémiai Kiadó ; Springer Science+Business Media, 1995-02)
Neutron captue prompt gamma-ray activation analysis at the NIST Cold Neutron Research Facility
(Kluwer Academic Publishers; Akadémiai Kiadó ; Springer Science+Business Media, 1993-01)
An instrument for neutron capture prompt gamma-ray activation analysis (PGAA) has been constructed as part of the Cold Neutron Research Facility at the 20 MW National Institute of Standards and Technology Research Reactor. ...
Production of XeO * in a CW microwave discharge
(Kluwer Academic Publishers-Plenum Publishers; Plenum Publishing Corporation ; Springer Science+Business Media, 1989-12)
A low-power CW microwave discharge at 2.45 GHz was used to produce XeO * excimer molecules. It was found that a total gas pressure between 5 and 20 Torr, absorbed power of about 20–100 W, and an oxygen-to-xenon ratio of ...
The half-life of 76 As
(Kluwer Academic Publishers; Kluwer Academic Publishers/Akadémiai Kiadó ; Springer Science+Business Media, 2003-09)
In the course of making high-accuracy measurements of arsenic, we found that the most recently published and compiled half-life of 76 As did not agree with our data as well as the earlier accepted value. To redetermine ...
Measuring hydrogen by cold-neutron prompt-gamma activation analysis
(Kluwer Academic Publishers; Akadémiai Kiadó ; Springer Science+Business Media, 1994-05)
By irradiating with cold neutrons and avoiding hydrogenous materials of construction, we have developed a PGAA instrument at the Cold Neutron Research Facility at NIST with hydrogen detection limits in the microgram range ...
Cold neutron prompt gamma activation analysis at NIST: A progress report
(Kluwer Academic Publishers; Akadémiai Kiadó ; Springer Science+Business Media, 1994-05)
An instrument for prompt gamma-ray activation analysis is now in operation at the NIST Cold Neutron Research Facility (CNRF). The cold neutron beam is relatively free of contamination by fast neutrons and reactor gamma ...
Optical emission spectroscopy of electron-cyclotron-resonance-heated helium mirror plasmas
(Kluwer Academic Publishers-Plenum Publishers; Plenum Publishing Corporation ; Springer Science+Business Media, 1991-03)
In this experiment emission spectroscopy in the 3000–5000 Å range has been utilized to determine the electron temperature (15–60 eV) and ion density (2–5 x 10 11 cm −3 ) of helium plasmas produced by the Michigan mirror ...