The interplay between a mobile target and a dynamic multileaf collimator can compromise the accuracy of intensity-modulated radiation therapy (IMRT). Our goal in this study is to investigate the dosimetric effects caused by the respiratory motion during IMRT. A moving phantom was built to simulate the typical breathing motion. Different sizes of the gating windows were selected for gated delive...

We give distance–redshift relations in terms of elliptic integrals for three different mass distributions of the Friedmann-Lemâitre-Robertson-Walker (FLRW) cosmology. These models are dynamically pressure free FLRW on large scales but, due to mass inhomogeneities, differ in their optical properties. They are the filled-beam model (standard FLRW), the empty-beam model (no mass density exists in ...

In the present paper, electrical energy harvesting from random vibrations of an Euler-Bernoulli nano-beam with two piezoelectric layers is investigated. The beam is composed of an aluminum layer together with two piezoelectric ceramic layers (PZT 5A) serving as energy harvesting sensors. In the proposed method, the equations governing the bimorph nano-beam will be analytically derived using cla...

Iterative learning control (ILC) applies to systems required track the desired trajectory of finite duration repeatedly. This article considers constrained ILC design for linear time-varying systems, a problem with limited, in relative terms, results literature but not uncommon practical applications. Different algorithms are developed, and their convergence properties established. An extension...

Formation of keV-energy Ar cluster ion beam is studied. Optimum condition for formation high intensity cluster beam with 2*10 16 clusters/sm 2 *sec investigated both experimentally and by numerical simulation. The mass distributions of the accelerated cluster ion beam were measured. It has been demonstrated that mass spectrum of cluster ion depend of collision processes between the ions during ...

Irradiations of intra-fractionally moving organs with a scanned ion beam need to be performed with a dedicated motion mitigation technique to avoid cold-spots in the delivered dose distribution due to interplay [1]. One possible way to achieve this is beam tracking [2]. Beam tracking compensates organ motion by adjusting the position of the pencil beam in real-time during treatment delivery. Th...

In this paper, the postbuckling problem and free linear nonlinear vibration surrounding configuration are accurately analyzed. The placement of translating beams that undergo significant overall buckling deformations in high-speed region, leading to strongly vibration, is studied. Using Galerkin method, we found partial differential equation reduced an ordinary with cubic quadratic terms, which...

1. Introduction This paper proposes beam scan by moving dielectric blocks mechanically in the feed waveguide of single-layer slotted waveguide arrays as shown in Fig.1. Millimeter-wave antennas with beam scan are desired in various systems such as collision-avoidance car radars [1-3]. Electrical scanning is the best but mechanical one is still attractive in terms of cost, efficiency, heat-radia...