Results of stellar evolution calculations and results of non-adiabatic stellar pulsation calculations can be used to construct theoretical , composition-dependent, short period boundaries (or \blue edges") of the instability strip in the period-luminosity plane for Cepheids pulsating in the fundamental and rst overtone radial modes. The slopes of these blue edges are very similar to the slopes ...

Abstract An optimized sliding‐mode observer control algorithm for permanent magnet synchronous motor (PMSM) is proposed to solve the problems in conventional algorithms (e.g., system chattering and phase delay). The adopts a new piecewise function as switching reduce chattering. low pass filter substituted with complex coefficient delay caused by filter. Moreover, counter emf back obtained usin...

The flow field and erosion pattern of continuous and pulsating impinging jets has been studied experimentally. The mean velocity field as well as turbulent and pulsation components, wall pressure and wall shear stress distr ibutions were investigated in an axisymmetric air jet impinging upon a rough wall. The results show how harmonic velocity pulsations at the nozzle affect both the mean and t...

Supraglacial streams are a significant part of the glacial hydrological system and important for understanding the connection between glacial hydrology and glacier dynamics. Here we determine the factors that influence the development of step-pool formation and pulsating flow in a supraglacial stream on Bylot Island, Nunavut. Results show that during the second week of a 2-week study, multiple ...

BACKGROUND Lower abdominal soft tissue transfer is the standard procedure for breast reconstruction. However, abdominal wall weakness and herniation commonly occur postoperatively at the donor site. To reduce the morbidities of the donor site, the superficial inferior epigastric artery (SIEA) flap was introduced, but inconsistent anatomy of the SIEA has reduced its utility. In the present study...

We suggest a mechanism for enhancing magnetic activity in tidally interacting binaries. We suppose that the deviation of the primary star from spherical symmetry due to the tidal influence of the companion leads to stellar pulsation in its fundamental mode. It is shown that stellar radial pulsation amplifies torsional Alfvén waves in a dipole-like magnetic field, buried in the interior, accordi...

By preparing a sensor system around isolated exceptional points, one can obtain great enhancement of the sensitivity benefiting from non-Hermiticity. However, this comes at cost reduction flexibility system, which is critical for practical applications. generalizing points to surfaces, it has been theoretically proposed recently that enhanced and be combined. Here, we experimentally demonstrate...

Gas pulsation in the discharge side of rotary compressor is one of the main sources of noise, so the discharge muffler is widely used to decrease the gas pulsation and noise level. Investigations on pressure pulsation in the muffler can provide not only a method to evaluate the muffler design and modification, but also a base for advanced study of noise in rotary compressor. In this paper the m...