Type Ia supernovae (SNe Ia) can be calibrated to be good standard candles at cosmological distances. However, at z > ∼ 1, gravitational lensing leads to significant level of noise in a SN Hubble diagram. We propose a pencil beam survey of SNe Ia which would yield a significant number of SNe in redshift bins of 0.1 for z up to 2. The SN number count can provide a direct probe of cosmology which ...

For cubic pencils we define the notion of an involution curve. This is a curve which intersects each pencil in exactly one non-base point pencil. Involution curves can be used to construct integrable maps plane leave invariant

2 Singularities and Extreme Points 4 2.1 Singularities and Genus . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 4 2.2 Parameterizing with a Pencil of Lines . . . . . . . . . . . . . . . . . . . . . . . . . . 6 2.3 Parameterizing with a Pencil of Curves . . . . . . . . . . . . . . . . . . . . . . . . . . 7 2.4 Algebraic Space Curves . . . . . . . . . . . . . . . . . . . . . ...

Processing speed is often described as a fundamental resource determining individual (e.g., I.Q.) and group (e.g., developmental) differences in cognition. However, most tests that measure speed present many items on a single page. Because many groups with slowed responding are also distractible, we compared younger and older adults on high(i.e., standard) versus low-distraction versions of two...

Item replenishment is important to maintaining a large scale item bank. In this paper we consider calibrating new items based on pre-calibrated operational items under the DINA model, the specification of which includes the so-called Q-matrix, as well as the slipping and guessing parameters. Making use of the maximum likelihood and Bayesian estimators for the latent knowledge states, we propose...

SUMMARY Flutter tests have been made on a half-wing model with a fan-engine nacelle attached by a pylon at an inboard section. The model was nominally rigid and flexibilities in pitch and roll were introduced at the root. Measurements were made of the flutter characteristics of the model at Mach numbers of 0.6 and 0.8 over a range of dynamic pressures using three different methods of analysis. ...

We report results of our investigation of the case of a 34-year-old woman (YJ) who showed persistent left unilateral spatial neglect (USN) in daily living, frequently hitting obstacles or bumping into the wall, although her visuospatial ability was mostly preserved in paper and pencil neuropsychological tests. In order to clarify this apparent discrepancy, her eye fixation pattern was monitored...

This study used computer-generated (“virtual”) mazes to investigate sex differences in the efficiency of spatial route learning in humans. Correlations between maze performance and traditional psychometric measures of spatial ability also were examined. Male and female subjects completed a total of five learning trials on each of two spatial mazes and completed a battery of spatial and verbal c...

We illustrate properties of the conics in Poncelet’s pencil using some new insights motivated by some elementary triangle constructions of Garcı́a.