The traditional microdosimetric approach uses observables such as the distribution of lineal energy deposition, y, and the specific energy deposition, z, to describe radiation quality with respect to damage in biological systems. A problem is, however, that there is no obvious link from purely physical observables to resulting biological effect. In recent developments, however, microdosimetric ...

Here I briefly summarize the talks about multiloop calculations [1,2,3,4,5,6,7] which were presented at the parallel session “Simulations and Computations in Theoretical Physics and Phenomenology” at the VIII International Workshop on Advanced Computing and Analysis Techniques in Physics Research (ACAT’2002), June 24–28, 2002, Moscow. In order to have some rough classification of these contribu...

Recently, algorithms for calculation of 3-loop propagator diagrams in HQET and on-shell QCD with a heavy quark have been constructed and implemented. These algorithms (based on integration by parts recurrence relations) reduce an arbitrary diagram to a combination of a finite number of basis integrals. Here I discuss various ways to calculate non-trivial bases integrals, either exactly or as ex...

A Monte Carlo simulation using the PRESTA version of the EGS4 code has been employed as an investigative tool to calculate the absorbed dose in water close to 192Ir wire implants. It has been shown that a treatment planning system, such as GE Target II, using the Sievert integral and the Meisberger polynomial is only able to reproduce the Monte Carlo results at radial distances of 1 mm and fart...

This note discusses the estimation of systematic uncertainties and their incorporation into upper limit calculations. Two different approaches to reducing systematics and their degrading impact on upper limits are introduced. An improved χ function is defined which is useful in comparing Poisson distributed data with models marginalized by systematic uncertainties. Also, a technique using profi...

I will discuss the recent progress toward computing few-body observables using numerical lattice techniques. The focus is overwhelmingly on the latest results from lattice QCD calculations. I present preliminary results from a lattice calculation of the central and tensor potentials between B-mesons in the heavy-quark limit.

We present a fast calculation of the electromagnetic field near the focus of an objective with a high numerical aperture (NA). Instead of direct integration, the vectorial Debye diffraction integral is evaluated with the fast Fourier transform for calculating the electromagnetic field in the entire focal region. We generalize this concept with the chirp z transform for obtaining a flexible samp...

Many statistics methods require one or more least squares problems to be solved. There are several ways to perform this calculation, using objects from the base R system and using objects in the classes defined in the Matrix package. We compare the speed of some of these methods on a very small example and on a example for which the model matrix is large and sparse. 1 Linear least squares calcu...

The current OWL specification does not include a syntax for specifying calculated values for data type properties. Their introduction, although acknowledged among the desiderata, seems yet unlikely to appear in the forthcoming OWL 2.0. This paper shows one way of working around this absence using annotations. The aim here is not to suggest a standard but, rather, to individuate the potential is...