13,500 research outputs found
Gluon Radiation in Top Quark Production and Decay at an e^+ e^- Collider
We study the effects of gluon radiation on top production and decay processes
at an collider.The matrix elements are computed without any
approximations, using spinor techniques. We use a Monte Carlo event generator
which takes into account the infrared singularity due to soft gluons and
differences in kinematics associated with radiation in the production versus
decay process. The calculation is illustrated for several strategies of top
mass reconstruction.Comment: 9 pages, LaTeX, 6 postscript figures, uses aipproc.sty; presented at
the 20th annual MRST meeting on High-Energy Physics, Montreal, Canada, 13-15
May 199
âWe kind of try to merge our own experience with the objectivity of the criteriaâ: The role of connoisseurship and tacit practice in undergraduate fine art assessment
This article explores connoisseurship in the context of fine art undergraduate assessment practice. I interviewed twelve fine art lecturers in order to explore and unpack
the concept of connoisseurship in relation to subjectivity, objectivity and tacit practice.
Building on the work of Bourdieu (1973, 1977, 1986) and Shay (2003, 2005), both of whom problematize the view that subjectivity and objectivity are binary opposites, my
research illustrates the ways that connoisseurship is underpinned by informed professional judgements located in communities of practice. Within this particular conception
of connoisseurship, the lecturersâ expertise is co-constituted in communities of assessors through participation and engagement. Standards reside in communities of practice
A new approach to understanding T cell development: the isolation and characterization of immature CD4-, CD8-, CD3- T cell cDNAs by subtraction cloning
During T cell development in the mammalian thymus, immature T cells are observed that lack the cell surface markers CD4, CD8, and CD3. A subtracted cDNA library was constructed to isolate cDNAs that are specific for these immature T cells. Tissue-specific expression of 97 individual cDNAs were examined using different cell types by Northern blot analysis, and six cDNAs were analyzed by reverse transcriptase (RT) polymerase chain reaction (PCR) detection of RNA. Approximately 50% of the clones could not be detected on Northern blots, and 40% of the clones were expressed by at least one other cell-type including monocytes, mature T cells, and B cells. Eight cDNA clones appear to be specific for the CD4-, CD8-, CD3- T cell line, used to construct the library, as determined by Northern blot analysis. In addition, 330 cDNA clones were subjected to partial automated DNA sequence determination. Database searches, with both nucleotide and protein translations, revealed cDNAs that exhibit interesting similarities to human cell-cycle gene 1, platelet-derived growth factor receptor, c-fms oncogene (CSF-1) receptor, and members of the immunoglobulin gene superfamily. This approach of employing subtraction coupled with large scale partial cDNA sequence determination can be useful to identify genes that may be involved in early T cell growth, cellular recognition or differentiation
Analytic design of a 2.0 GHz space borne linear injected beam crossed field amplifier Final report
High efficiency design for crossed field amplifier for application in synchronous satellite
A theoretical investigation of 2-2 composite transducers with high shear attenuation in the passive phase
This paper is about a theoretical investigation of 2-2 composite transducers with high shear attenuation in the passive phase. It was presented at the Ătude de la propagation ultrasonore en milieux non homogènes en vue du contrĂ´le non-destructif in 2007
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