Frank Thomson

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We study the graph-theoretic problem of embedding a graph in a book with its vertices in a line along the spine of the book and its edges on the pages in such a way that edges residing on the same page do not cross. This problem abstracts layout problems arising in the routing of multilayer printed circuit boards and in the design of fault-tolerant(More)
The power of butterry-like networks as multicomputer interconnection networks is studied, by considering how eeciently the butterry can emulate other networks. Emulations are studied formally via graph embeddings, so the topic here becomes: How eeciently can one embed the graph underlying a given interconnection network in the graph underlying the butterry(More)
Root rot of parsnip (Pastinaca sativa) and parsley (Petroselinum crispum) crops in south-eastern Australia is a disease complex, causing up to 80 % and 100 % yield losses, respectively. It is attributed to a range of fungi and oomycetes. We report on isolation and identification of eleven Pythium spp. from naturally infected roots of parsnip and parsley(More)
The four-jet nal state is analyzed to search for hadronic decays of pair-produced heavy particles. The analysis uses the ALEPH data collected at LEP in November 1995 at centre-of-mass energies of 130 and 136 GeV, corresponding to a total integrated luminosity of 5.7 pb ?1. An excess of four-jet events is observed with respect to the standard model(More)
The growing importance of networked workstations as a computing milieu has created a new modality of parallel computing, namely, the possibility of having one workstation \steal cycles" from another. In a typical episode of cycle-stealing, the owner of workstation B allows the owner of workstation A to take control of B's processor whenever it is idle, with(More)
Options for the integrated management of white blister (caused by Albugo candida) of Brassica crops include the use of well timed overhead irrigation, resistant cultivars, programs of weekly fungicide sprays or strategic fungicide applications based on the disease risk prediction model, Brassicaspot™. Initial systematic surveys of radish producers near(More)
A lower limit is set on the B 0 s meson oscillation parameter m s using data collected from 1991 to 1994 by the ALEPH detector. Events with a high transverse momentum lepton and a reconstructed secondary vertex are used. The high transverse momentum leptons are produced mainly by b hadron decays, and the sign of the lepton indicates the(More)
Four-fermion events have been selected in a data sample of 5.8 pb ?1 collected with the aleph detector at centre-of-mass energies of 130 and 136 GeV. The nal states`+`? q q, ` + ` ? ` + ` ? , q q, and`+`? have been examined. Five events are observed in the data, in agreement with the Standard Model predictions of 6:67 0:38 events from four-fermion processes(More)
From approximately 3 million hadronic decays of Z bosons recorded with the aleph detector at lep, a sample of 410 32 B 0 ! D + ` ? ` candidates is selected, wherè is either an electron or a muon. The diierential decay rate d?(B 0 ! D + ` ? `)=d! from this sample is tted, yielding a value for the product of the CKM matrix element jV cb j and the(More)
Using approximately 4 million hadronic Z decays recorded with the aleph detector from 1991 through 1995, the lifetime of the b baryon is measured with three independent methods. From the impact parameter distribution of candidate leptons in 1063 events with`? combinations, the average b baryon lifetime is measured to be 1:200:08 0:06 ps. From a sample of(More)