An assessment of mussel mortality caused by a drop in the water level of Lake Kariba

The level of Lake Kariba steadily fell during the period 1 June 1979 to 2 Feb 1980, except for a 2-wk period during Dec when it was allowed to rise slightly. Following this the level was again drawn down in anticipation of the Upper Zambezi flood water reaching the lake. At its highest level in June 1979 the lake was 487.42 m above sea level but by Feb 1980 it had dropped to 484.53 m, a total drop of 2.89 m. This left a considerable area of exposed shoreline and a large number of stranded mussels. This report presents the results of an attempt to estimate the mussel mortality, carried out from 28 Jan to 1 Feb 1980. The study area extended from the Charara river mouth to Andora harbour with a total of 24 stations

Transition Radiation from Rough Surfaces

We propose a theory of transition radiation emitted by charged particles entering a rough interface between two media. We show that the radiation process is influenced by surface inhomogeneities distributed both longitudinally and transversally with respect to the direction of particle motion. Moreover, we investigate in detail the transition radiation emitted at normal incidence of particles on a surface with Gaussian distribution of inhomogeneity deviations in relation to the smooth surface.Zadanie pt. Digitalizacja i udostępnienie w Cyfrowym Repozytorium Uniwersytetu Łódzkiego kolekcji czasopism naukowych wydawanych przez Uniwersytet Łódzki nr 885/P-DUN/2014 zostało dofinansowane ze środków MNiSW w ramach działalności upowszechniającej naukę

A short proof of a conjecture on the TrT_r-choice number of even cycles

In this note we prove that the $T_r$-choice number of the cycle $C_{2n}$ is equal to the $T_r$-choice number of the path (tree) on $4n-1$ vertices, i.e. $T_r$-$ch(C_{2n}) = \left\lfloor(2r+2)(4n-2)/(4n-1)\right\rfloor + 1$. This solves a recent conjecture of Alon and Zaks. \u

Cruise Report 73-KB-16: Big game fish investigations

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Geology of the Quernmore area : 1:10 000 sheet SD55NW : part of 1:50 000 Sheet 59 (Lancaster)

This report describes the surface geology of the 1:10 000 Series sheet SD 55 NW, part of the 1:50 000 Series sheet 59 (Lancaster). Detailed descriptions of the geological sequence encountered in the Wyresdale Tunnel, which crosses beneath the eastern part of this area, can be found in Johnson (1981) and Wilson et al. (1989). The area was first mapped at the 1:10 560 scale by J.R. Dakyns and R.H. Tiddeman in 1875-76 and published at the 1:10 560 scale in 1880 as parts of the Lancashire County Series sheets 30, 31, 34 and 35. In 1884 the geological information was published at the 1:63 360 scale as part of the Old Series sheet number 59 (Lancaster). During the present survey, the area to the south-east of the Quernrnore to Garstang road (approximately three quarters of the sheet) was mapped by Dr A.A. Wilson in 1984, as part of the BGS work commissioned by the North-west Water Authority in response to the Abbeystead Explosion Public Enquiry. Several, significant and previously unknown marine band localities were discovered by Dr Wilson during this survey. The remainder of the sheet was surveyed by Dr R.A. Hughes in 1988. A limited amount of field work was carried out by Dr A Brandon in 1990 and parts of the geological mapped revised. The area is one of hilly pastureland, marginal to the high, heather covered moorland of the Bowland Fells to the north-east. The rugged escarpment of Clougha extends into the north-east corner of the sheet, the highest point [5492 5939] being 421 m above Ordnance Datum. In the west, the north-east trending valley of the River Conder is the major topographical feature, and drains to the south. The lowest point is at the western end of the Conder valley [579 500], where elevation is less than 45 m above Ordnance Datum. To the east of the Conder valley the main lines of drainage flow from north to south along a series of glacial meltwater channels. The only centre of habitation is the ribbon development of Quernrnore [59 51]. The north-eastern part of the area was mapped by Moseley (1954). A detailed geological log of the Wyresdale Tunnel, constructed to link the drainage systems of the Rivers Lune and Wyre, was made by E.W. Johnson, N. Aitkenhead, J.I. Chisholm, R.S. Arthurton, and D.J.C. Mundy of the BGS, during construction. The results were published in a sedimentological synthesis by Johnson (1981), who described the succession in terms of a prograding delta-front sequence. Following the Wyresdale Tunnel explosion in May 1984, the BGS surveyed the area in an attempt to identify the source and the trap of the methane which exploded. A description of the geology as found during this survey is given in Wilson, Brandon, and Johnson (1989). All fossils recorded in this report were identified by Dr N.J.Riley. Subsequent to the preparation of the original draft report the stratigraphy and geological map of the area has been revised, particularly with regards to the Roeburndale Formation. This report therefore includes parts revised by Dr A Brandon in consultation with Or A A Wilson

Aspects of career development and information management policies at the Bank of Japan - a frank interview with a former central banker

Relatively little empirical research has been published on the internal affairs of central banks. Secrecy is a key aspect of central banking, and this has posed a major obstacle to researchers. In this paper, an experienced and senior former Bank of Japan official is interviewed concerning the personnel management and information management policies, as well as the informal ‘guidance’ at the Bank of Japan. A number of surprising details emerge concerning the personnel management and information management policies of the Japanese central bank.<br/

Finding information again using an individual’s web history

In a lifetime, an “average” person will visit approximately a million webpages. Sometimes a person finds they want to return to a given page at some future date but, having no recollection of where it was (URL, host, etc.) and so has to look for it again from scratch. This paper assesses how a person’s memory could be assisted by the presentation of a “map” of their web browsing activity. Three map organisation approaches were investigated: (i) time-based, (ii) place-based, and (iii) topic-based. Time-based organisation is the least suitable, because the temporal specificity of human memory is generally poor. Place-based approaches lack scalability, and are not helped by the fact that there is little repetition in the paths a person follows between places. Topic-based organisation is more promising, with topics derived from both the web content that is accessed and the search queries that are executed, which provide snapshots into a person’s cognitive processes by explicitly capturing the terminology of “what” they were looking for at that moment in time. In terms of presentation, a map that combines aspects of network connectivity with a space filling approach is likely to be most effective