Group Formation

Peer Reviewedhttp://deepblue.lib.umich.edu/bitstream/2027.42/68807/2/10.1177_104649647300400206.pd

Energy loss due to defect formation from 206Pb recoils in SuperCDMS germanium detectors

The Super Cryogenic Dark Matter Search experiment at the Soudan Underground Laboratory studied energy loss associated with defect formation in germanium crystals at mK temperatures using in situ 210Pb sources. We examine the spectrum of 206Pb nuclear recoils near its expected 103 keV endpoint energy and determine an energy loss of (6:08 ± 0:18)%, which we attribute to defect formation. From this result and using TRIM simulations, we extract the first experimentally determined average displacement threshold energy of 19.7+0.6−0.5 eV for germanium. This has implications for the analysis thresholds of future germanium-based dark matter searches

Using Simulated Students to Evaluate an Adaptive Testing System

This paper describes a strategy for evaluating adaptive tests by means of simulations of student b ehaviours. After a brief introduction to the topic of adaptive tests and a discussion of the use of simulation of student behaviour in the field of Intelligent Tutoring Systems, the paper shows h ow a ''student model'', which may be constructed during a testing process, can be used as the kernel of a simulation of student ability. The paper then discusses how such a simulation can be used as part of the necessary ''pre-production'' evaluation of an adaptive test. Finally, it describes the use of simulations to fine-tune an adaptive test to yield a desired effectiveness

Social science computing services

ESRC Award H-00/23/2010SIGLEAvailable from British Library Document Supply Centre- DSC:9082.689(30) / BLDSC - British Library Document Supply CentreGBUnited Kingdo