97 © 2016 Guilford Publications, Inc. this work was facilitated by support from the national Science foundation, ford foundation, SpSSi, tufts university, and a provost’s Scholarship from the university of chicago. We would like to thank laura Babbitt for suggestions on this project and our research assistants. correspondence should be addressed to Sarah e. gaither, department of psychology, 58...

We examine several types of visibility graphs in which sightlines can pass through k objects. For k ≥ 1 we bound the maximum thickness of semi-bar k-visibility graphs between d 2 3 (k + 1)e and 2k. In addition we show that the maximum number of edges in arc and circle k-visibility graphs on n vertices is at most (k+1)(3n− k− 2) for n > 4k+4 and ( n 2 ) for n ≤ 4k + 4, while the maximum chromati...

-Peripheral blood lymphocytes (PBL) were obtained from 13 patients and tumour-intrinsic lymphocytes (TIL) from 20 patients with colorectal cancer. The PBL were separated on a Ficoll-Isopaque gradient and the TIL by digestion of the tumour with collagenase-DNase. Both PBL and TIL were passed through nylonwool columns and the eluted cells were co-cultured for 2 h with 51Cr-labelled tumour cells f...

The influence of pad facing material on hydrodynamic lubrication in tilting-pad thrustbearings is investigated in terms of pad and oil-film temperatures and oil-film thickness. Two tilting-pad thrust bearings are examined: one with babbitt pad facing, the other with a layer of a PTFE based composite material. Frictional torque, pad, collar and oil-film temperatures and oil-film thicknes...