Approximating nonstationaryPh(t)/M(t)/s/c queueing systems

Nonstationary phase processes are defined and a surrogate distribution approximation (SDA) method for analyzing transient and nonstationary queueing systems with nonstationary phase arrival processes is presented. Regardless of system capacityc, the SDA method requires the numerical solution of only 6K differential equations, whereK is the number of phases in the arrival process, compared to theK(c+1) Kolmogorov forward equations required for the classical method of solution. Time-dependent approximations of mean and variance of the number of entities in the system and the number of busy servers are obtained. Empirical test results over a wide range of systems indicate the SDA is quite accurate.This research was partially funded by National Science Foundation grant ECS-8404409.     

Thermal conductivity of NbSe3

The thermal conductivity, κ, of NbSe₃ has been measured by novel self-heating techniques that allowed the electric field dependence of κ to also be measured. Measurements were made from 35 K to room temperature. Above the charge density wave transitions, the phonon thermal conductivity is 4–7 times the electron thermal conductivity, and it rises smoothly below the transitions, indicating that phonon-phonon scattering predominates. Phonon mean free parths have been estimated at 187 A° at 60 K and 60 A° at 150 K. No clear anomalies were observed at the phase transitions, giving upper limits to changes in the phonon mean free path. No field dependence of κ was observed.     

Anisotropic effects in the angular distribution of photoelectrons from cesium 6s

Dirac-Fock calculations show dramatic variations of the asymmetry parameter with energy for Cs 6s in contrast to the β = 2 prediction of more approximate theories.     

A new statement of Einstein's equivalence principle and relevant experiments

By considering the relationship between a freely falling frame and a local Lorentz frame, we propose a new expression of Einstein's equivalence principle (EEP). According to it, some feasible experiments should be done to test EEP. We point out that the effect of the magnetic-type gravitational counterpart of the Aharonov-Bohm experiment is too small to be detected now.     

Redox-driven shaving of dendrimers

A new methodology utilizing a redox-triggered activation for the facile release of dendrimer end groups is reported.     

Cyclopolymerisation. 7. Mitt. Die13C-NMR-Spektren von Cyclopolymeren aus N,N-Diallylaminen

Ohne Zusammenfassung     

Cyclopolymerisation. 6. Mitt. Darstellung und Eigenschaften von vernetzten cyclopolymerisierten Polyaminen.

Ohne Zusammenfassung