The imaging revolution with Ultrasound, Computed Tomography, and Magnetic Resonance Imaging entered the world of treatment planning in external beam radiation therapy in the 80ies and 90ies, step by step (9). With the support of modern computer technology, this has led to sophisticated, widespread, 3D sectional image based treatment planning, that nowadays increasingly forms an essential integr...

In this paper, vibration analysis of multiple-stepped Bernoulli-Euler and Timoshenko beams carrying point masses is presented analytically for various boundary conditions. Each attached element is considered to have both translational and rotational inertias. The method of solution is “transfer matrix method” which is based on the changes in the vibration modes at the vicinity of any discontinu...

We further study the incidence relations that arise from the various subtowers, known as Baby Monsters, which exist within the R-Monster Tower. This allows us to complete the RV T class spelling rules. We also present a method of calculating the various Baby Monsters that appear within the Monster Tower. MSC Primary: 58A30 Secondary: 58A17, 58K50.

SN 2002kg is a type IIn supernova, detected in October 2002 in the nearby spiral galaxy NGC 2403. We show that the position of SN 2002kg agrees within the errors with the position of the LBV V37. Ground based and HST ACS images however show that V37 is still present after the SN 2002kg event. We compiled a lightcurve of V37 which underlines the variablity of the object, and shows that SN 2002kg...

We investigate the possibility to detect giant planets that are still embedded in young circumstellar disks. Based on models with different stellar, planetary, and disk masses, and different radial positions of the planet we analyze the resulting submillimeter appearance of these systems. We find that the influence of the planet on the spectral energy distribution could not be distinguished fro...

We developed a new, three-dimensional simulation code ETRA3D to calculate beam dynamics in the injector of PNC s high-power, high-duty electron linac. In ETRA3D, beam dynamics are calculated by Hamiltonian equations and the space-charge force is calculated by the potentials produced by other electrons. The Hamiltonian is calculated at each time step and the length of the time step is varied by ...

Future kaon decay programs at BNL and FNAL are discussed. The primary focus of these programs is the measurement of the golden modes, K: -+ n“v~ and K+ -+ m+VD . The observation of K+ -+ T+VD by E787 at BNL is the first step in a series of measurements which will completely determine the unitarity triangle within the kaon system. The next step after E787 in the measurement of B(K+ + n+vfi ) wil...

Future kaon decay programs at BNL and FNAL are discussed. The primary focus of these programs is the measurement of the golden modes, K • L → π • νν and K + → π + νν. The observation of K + → π + νν by E787 at BNL is the first step in a series of measurements which will completely determine the unitarity triangle within the kaon system. The next step after E787 in the measurement of B(K + → π +...

The purpose of this study was to develop and evaluate filmless quality assurance (QA) tools for helical tomotherapy by using the signals from the on-board megavoltage computed tomography (MVCT) detector and applying a dedicated step-wedge phantom. The step-wedge phantom is a 15 cm long step-like aluminum block positioned on the couch. The phantom was moved through the slit beam and MVCT detecto...