528 research outputs found
Expansion of a mathematical model of thermoregulation to include high metabolic rates Final report, Jun. 19, 1967 - Jun. 18, 1968
Mathematical model of human thermoregulation with high metabolic rate
A Common-Path Interferometer for Time-Resolved and Shot-Noise-Limited Detection of Single Nanoparticles
We give a detailed description of a novel method for time-resolved
experiments on single non-luminescent nanoparticles. The method is based on the
combination of pump-probe spectroscopy and a common-path interferometer. In our
interferometer, probe and reference arms are separated in time and polarization
by a birefringent crystal. The interferometer, fully described by an analytical
model, allows us to separately detect the real and imaginary contributions to
the signal. We demonstrate the possibilities of the setup by time-resolved
detection of single gold nanoparticles as small as 10 nm in diameter, and of
acoustic oscillations of particles larger than 40 nm in diameter
Point defects in silicon after zinc diffusion - a deep level transient spectroscopy and spreading-resistance profiling study
We present results from spreading-resistance profiling and deep level transient spectroscopy on Si after Zn diffusion at 1294 K. Concentration profiles of substitutional in dislocation-free and highly dislocated Si are described by a diffusion mechanism involving interstitial-substitutional exchange. Additional annealing at 873 K following quenching from the diffusion temperature is required in the case of dislocation-free Si to electrically activate . The formation of complexes of with unwanted impurities upon quenching is discussed. Additional Ni diffusion experiments as well as total energy calculations suggest that Ni is a likely candidate for the passivation of Zns. From total energy calculations we find that the formation of complexes involving Zn and Ni depends on the position of the Fermi level. This explains differences in results from spreading-resistance profiling and deep level transient spectroscopy on near-intrinsic and p-type Si, respectively
Development of mathematical models of environmental physiology
Selected articles concerned with mathematical or simulation models of human thermoregulation are presented. The articles presented include: (1) development and use of simulation models in medicine, (2) model of cardio-vascular adjustments during exercise, (3) effective temperature scale based on simple model of human physiological regulatory response, (4) behavioral approach to thermoregulatory set point during exercise, and (5) importance of skin temperature in sweat regulation
Expansion of a mathematical model of thermoregulation to include high metabolic rates Final report, 19 Jun. 1968 - 18 Jun. 1969
Body temperature and sweating during thermal transients caused by exercis
Potassium self-diffusion in a K-rich single-crystal alkali feldspar
The paper reports potassium diffusion measurements performed on gem-quality
single-crystal alkali feldspar in the temperature range from to 1021 \,
\mbox{K}. Natural sanidine from Volkesfeld, Germany was implanted with
\mbox{}^{43}\mbox{K} at the ISOLDE/CERN radioactive ion-beam facility normal
to the (001) crystallographic plane. Diffusion coefficients are well described
by the Arrhenius equation with an activation energy of 2.4 \, \mbox{eV} and a
pre-exponential factor of 5\times10^{-6} \, \mbox{m}^{2}/\mbox{s}, which is
more than three orders of magnitude lower than the \mbox{}^{22}\mbox{Na}
diffusivity in the same feldspar and the same crystallographic direction.
State-of-the-art considerations including ionic conductivity data on the same
crystal and Monte Carlo simulations of diffusion in random binary alloy
structures point to a correlated motion of K and Na through the interstitialcy
mechanism
Effects of ion pairs on mass and charge transport in a crosslinked amorphous polymer electrolyte
- …