This paper presents an analytical and numerical study on the dispersion properties of an Euler–Bernoulli beam immersed in a steady fluid flow with periodic arrays of airfoilshaped vibration absorbers attached to it. The resonance characteristics of the airfoils generate strong attenuation of flexural waves in the beam occurring at frequencies and numerical tools are developed to investigate the...

To study the fast-ion transport in a well controlled background plasma, a 3-cm diameter rf ion gun launches a pulsed, ,300 eV ribbon shaped argon ion beam parallel to or at 15° to the magnetic field in the Large Plasma Device sLAPDd fW. Gekelman, H. Pfister, Z. Lucky, J. Bamber, D. Leneman, and J. Maggs, Rev. Sci. Instrum. 62, 2875 s1991dg at UCLA. The parallel energy of the beam is measured by...

Abstract The effect of the foundation heterogeneity on mechanical behaviour a beam Vlasov soils is discussed. According to refined soil model, static problem beams lying transversely isotropic can be solved by an iterative method. In this paper, based energy variational principle, differential equations for under axial force foundations are derived. methods solving internal forces and deformati...

Accurate estimates of the ultrasound pressure and/or intensity incident on the developing fetus on a patient-specific basis could improve the diagnostic potential of medical ultrasound by allowing the clinician to increase the transmit power while still avoiding the potential for harmful bioeffects. Neglecting nonlinear effects, the pressure/intensity can be estimated if an accurate estimate of...

PURPOSES To determine the diagnostic capabilities of dynamic high-resolution electron-beam (HREB) CT scanning for diagnosing bronchiolitis obliterans syndrome (BOS) in lung transplant recipients. MATERIALS AND METHODS At the time of follow-up examinations after lung transplantation, 52 patients were examined by dynamic HREB CT scan. Visual signs of small airway disease were assessed and compa...

At short wavelengths, the attenuation of the radar signal due to precipitation along its path constitutes a major source of error for radar rainfall estimation. The different techniques developed to correct for this attenuation generally assume that the radar sampling volumes are homogeneously filled by rainfall. However, rainfall is highly variable over a large range of scales, and the influen...

OBJECTIVE X-ray attenuation coefficients are used in common radiological, pathological and spectroscopic examinations and in the determination of the radiation dose distribution in biological tissues. In radiology, these coefficients enable diagnosis by differentiating the abnormal tissues from the normal ones using their morphological structure and contrast differences. In this study, our aim ...

Molecular absorption by the precipitation media is known to reduce values of horizontal reflectivity (ZH) and differential reflectivity (ZDR) for precipitation radars operating at relatively short wavelengths. This attenuation effect is most pronounced behind intense convective echoes. With the advent of polarization diversity, differential propagation phase measurements (ΦDP) offer the advanta...

Vascular access ports are used widely in the administering of drugs for radiation oncology patients. Their dosimetric effect on radiation therapy delivery in photon beams has not been rigorously established. In this work the effects on external beam fields when any of a variety of vascular access ports is included in the path of a high energy beam are studied. This medical physics study specifi...

The ice, cloud, and land elevation satellite-2 (ICESat-2) is providing global measurements to the science community. ICESat-2 measures height of Earth’s surface using a photon counting laser altimeter, ATLAS (advanced topographic altimetry system). As system, number reflected photons per shot, or radiometry, function primarily transmitted energy, solar elevation, reflectance, atmospheric scatte...