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Research Interests:
Research Interests:
Research Interests:
Research Interests:
Research Interests:
Research Interests: Sociology, Higher Education, Educational Research, Case Study Research, Content Analysis, and 12 moreCase Studies, Work Based Learning, Policy Analysis, Interviews, Career Development, Case Study, Education Systems, Flexibility in engineering design, Government Policy, Learning Process, Curriculum and Pedagogy, and Vocational Education Training
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Research Interests:
The advent of large area deep radio and X-ray sky surveys is leading to the creation of many new BL Lac samples. In particular, the Rosat All-Sky (RASS) and the VLA's FIRST (Faint Images of the Radio Sky at Twenty centimeters)... more
The advent of large area deep radio and X-ray sky surveys is leading to the creation of many new BL Lac samples. In particular, the Rosat All-Sky (RASS) and the VLA's FIRST (Faint Images of the Radio Sky at Twenty centimeters) surveys are proving to be rich sources of new BL Lacs. We will discuss the methods used in several independent BL Lac searches based on these surveys, including the RASS-Green Bank, RASS-FIRST, and FIRST Flat Spectrum samples in addition to the large sample of serendipitous BL Lacs discovered in the course of the FIRST bright quasar survey. We will present the multiwavelength properties of these objects, including their broadband radio, optical and X-ray flux distributions, and their optical emission line and polarization properties. Comparison of these properties with those of previously known BL Lacs clearly points to the existence of a large previously unrecognized population of intermediate BL Lacs: objects with characteristics intermediate between th...
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Research Interests:
As part of the changes to industrial classifications following the United Nations’ revision to the International Standard Industrial Classification, ISIC Rev. 4, the UK moved to its version of a new classification between 2007 and 2011.... more
As part of the changes to industrial classifications following the United Nations’ revision to the International Standard Industrial Classification, ISIC Rev. 4, the UK moved to its version of a new classification between 2007 and 2011. We describe the processes involved in changing an industrial classification, including model-based adjustment methods and changes to survey designs and operations. We discuss the quality of the approaches used for different time periods in the same series, and the ways in which consistent time series are produced for users of economic statistics. We provide some general evaluation of the changeover, and guidance on the best approaches to follow when updating classifications.