Analog-to-digital conversion techniques for precision photometry

Three types of analog-to-digital converters are described: parallel, successive-approximation, and integrating. The functioning of comparators and sample-and-hold amplifiers is explained. Differential and integral linearity are defined, and good and bad examples are illustrated. The applicability and relative advantages of the three types of converters for precision astronomical photometric measurements are discussed. For most measurements, integral linearity is more important than differential linearity. Successive-approximation converters should be used with multielement solid state detectors because of their high speed, but dual slope integrating converters may be superior for use with single element solid state detectors where speed of digitization is not a factor. In all cases, the input signal should be tailored so that they occupy the upper part of the converter's dynamic range; this can be achieved by providing adjustable gain, or better by varying the integration time of the observation if possible

The electromagnetic spike solutions

The aim of this paper is to use the existing relation between polarized electromagnetic Gowdy spacetimes and vacuum Gowdy spacetimes to find explicit solutions for electromagnetic spikes by a procedure which has been developed by one of the authors for gravitational spikes. We present new inhomogeneous solutions which we call the EME and MEM electromagnetic spike solutions.Comment: V3: 13 pages and 4 figures. No change in main result. Title and names of the solutions changed to make their physical interpretation more clea

Future asymptotics of tilted Bianchi type II cosmologies

In this paper we study the future asymptotics of spatially homogeneous Bianchi type II cosmologies with a tilted perfect fluid with a linear equation of state. By means of Hamiltonian methods we first find a monotone function for a special tilted case, which subsequently allows us to construct a new set of monotone functions for the general tilted type II cosmologies. In the context of a new partially gauge invariant dynamical system, this then leads to a proof for a theorem that for the first time gives a complete description of the future asymptotic states of the general tilted Bianchi type II models. The generality of our arguments suggests how one can produce monotone functions that are useful for determining the asymptotics of other tilted perfect fluid cosmologies, as well as for other sources.Comment: 15 page

Junior Recital, Chet Frierson, saxophone

The presentation of this junior recital will fulfill in part the requirements for the Bachelor of Music degree in Jazz Studies. Chet Frierson studies saxophone with J.C. Kuhl

Elegy for Stan

Chet Corey was born and raised in Minneapolis. Chet Corey’s poems have appeared in literary and religious journals since the mid-1960s, including Benedictines Magazine, Kansas Quarterly, Louisville Review, National Catholic Reporter, Review for Religious, South Dakota Review, and Windhover (U. of Mary-Hardin Baylor). Most recently poems have appeared in or are forthcoming in Coe Review, Right Hand Pointing and Stoneboat. Chet and his wife Kathy live alongside Bush Lake in Bloomington, Minnesota