[en] Calculations of microwave radiation power dependence upon magnetron parameters with a real voltage pulse shape being considered showed fairly good agreement with similar dependencies obtained experimentally. This allowed to choose magnetron optimal parameters in agreement with a high current accelerator as a power source. Next way to increase radiated power is to sum up powers of some pulse relativistic magnetrons. A scheme is based on the principle of nonsymmetry allowing a rather strong mismatch of magnetrons eigenfrequencies and being not so critical to a choice of connection line length. The strong coupling provides fast phase locking and high efficiency of the pulse powers addition

[en] The discovery of the Principle of Phase Stability by Vladimir Veksler and Edwin McMillian and the end of the war released a surge of accelerator activity at the Lawrence Berkeley Laboratory (then The University of California Radiation Laboratory). Six accelerators incorporating the Principle of Phase Stability were built in the period 1945--1954

[en] The crystalline phases ratio cubic/monoclinic or cubic/tetragonal in the PSZ/Mg zirconia account for its high thermal shock resistence. The optimization of the phases ratio is obtained through thermal annealing after sinterization. This work presents the effect of iron and silicon on the thermal annealing of ZrO2 + 4% MgO ceramic. (author)

[en] We study the entanglement dynamics of two atoms with initial tripartite entangled W-like state in the Tavis–Cummings model. We find that the entanglement evolvement is sensitive not only to the entanglement degree of the initial state but also to the concrete form of the initial state. The so-called sudden death effect occurs only for some initial states

[en] By using a system of internal phase-defining slits, beams with energy resolution δE/E approximately equal to 1:1000 have been attained at TRIUMF. The eventual aim of an energy spread of <100 keV implies separated turn extraction over the entire energy range of 200-520 MeV. To achieve this, work has proceeded toward the following three requirements: i) beam phase stability of +-2₀, ii) rf voltage stability of δV/V = 5x10^-₅ and iii) flat-topping of the rf fundamental with the addition of a third harmonic. Phase stability of +-1.5₀ has been demonstrated for several hours, using 3 software feedback loops: i) slow magnet drifts measured with an NMR probe to control the magnet power supply; ii) fast fluctuations in the field detected with an outer trim coil provide a correction to the rf frequency; and iii) phase fluctuations measured with the beam itself provide a final rf frequency correction. These loops have been implemented with dedicated CAMAC-based microprocessors

[en] Long-term stability of high entropy alloys (HEAs) is a critical consideration for the design and practical application of HEAs. It has long been assumed that many HEAs are a kinetically-stabilized metastable structure, and recent experiments have confirmed this hypothesis by observing HEA ecomposition after long-termequilibration. In the presentwork,we demonstrate the use of the CALculation of PHAse Diagrams (CALPHAD) approach to predict HEA stability and processing parameters, comparing experimental long-term annealing observations to CALPHAD phase diagrams from a commercially-available HEA database. As a result, we find good agreement between single- and multi-phase predictions and experiments.

[en] Published in summary form only

No abstract available

[en] Lead zirconate titanate (PZT) piezoelectric ceramics were driven in a resonant mode at various power levels. The stability of the PZT piezoelectric ceramics is found to depend greatly on the driving power level. At low driving power, the ceramics are very stable and the properties remain unchanged after continuous vibration for long periods of time. When the driving power is relatively high, however, an obvious temperature rise is observed in the ceramics during vibration and serious degradation occurs to the properties of the ceramics after some periods of continuous vibration. As the properties of the degraded ceramics are restored after an ageing process, it is proposed that high power resonant driving causes a de-ageing effect on PZT piezoelectric ceramics, which leads to degradation. The heat generated in PZT ceramics by driving with relatively high power is proved to play a vital role in the de-ageing effect

No abstract available