The composite-tendency Robert-Asselin-Williams (RAW) filter in semi-implicit integrations

Timediscretization in weatherandclimate modelsintroduces truncation errors that limit the accuracy of the simulations. Recent work has yielded a method for reducing the amplitude errors in leap-frog integrations from first-order to fifth-order.This improvement is achieved by replacing the Robert–Asselin filter with the Robert–Asselin–Williams (RAW) filter and using a linear combination of unfiltered and filtered states to compute the tendency term. The purpose of the present article is to apply the composite-tendency RAW-filtered leapfrog scheme to semi-implicit integrations. A theoretical analysis shows that the stability and accuracy are unaffected by the introduction of the implicitly treated mode. The scheme is tested in semi-implicit numerical integrations in both a simple nonlinear stiff system and a medium-complexity atmospheric general circulation model and yields substantial improvements in both cases. We conclude that the composite-tendency RAW-filtered leap-frog scheme is suitable for use in semi-implicit integrations.

Bathymetric distribution of the shrimp Rimapenaeus constrictus (Stimpson, 1874) (Decapoda, Penaeidae) in two locations off the southeastern Brazilian coast

The distribution of benthic organisms is directly or indirectly associated with the physical and chemical properties of the water and sediment. This study analysed the spatial and temporal distribution of Rimapenaeus constrictus in unconsolidated sublittoral sediments of two areas off the northern coast of the state of Sao Paulo, Brazil. We also analysed the association of environmental factors with the occurrence of this species. Shrimp were collected monthly from July 2001 to June 2003, with a fishing boat equipped with two double-rig nets, in the regions of Ubatuba (UBA) and Caraguatatuba (CA). The collections were made during the day, along five transects with mean depths of 5, 10, 15, 20, 25, 30, and 35 m. We obtained a total of 5478 individuals, 3403 (UBA = 2025 and CA = 1378) during the first year, and 2075 (UBA = 875 and CA = 1200) during the second year. Significant differences in abundance were observed in relation to depth, season of the year, and also in the interaction between region and depth. Higher abundances occurred in fall and winter, independently of the sampling year. The largest numbers of shrimp were caught on the 20-m transect in UBA and the 25-m transect in CA. It is concluded that the distribution pattern of this species is closely related to environmental factors, and the temperature of the bottom water and the sediment texture were the most significant variables affecting the distribution.

Civilisation, culture and the hybrid self in the work of Robert Ezra Park

Contemporary discussions on hybridity in cultural and ethnic studies have overlooked the work of the Chicago sociologist Robert E. Park. Park's idea of the “marginal man” and his work on cultural and racial hybridity can shed further light on the construction and representation of the hybrid self. The contribution that Park has made to a social theory of hybridity has been overshadowed by research conducted within post-colonial and cultural studies. I do not suggest that recent conceptualisations of hybridity are inadequate; rather that Park has something to contribute to contemporary accounts and in some cases anticipates some of the themes and issues surrounding the concept of hybridity. The following examination connects Park's work on hybridity with ideas such as civilisation, culture and modernity and argues that a mild form of primitivism underlines his notion of the “marginal man”.

T.S. Eliot`s idea of the clerisy, and its discussion by Karl Mannheim and Michael Polanyi in the context of J.H. Oldham`s moot

In 1938, Joseph Oldham, a leading British Christian ecumenist, formed a discussion group that came to be known as the Moot. The Moot met in a retreat setting for several long weekends each year until early 1947, its discussions carefully organized and convened by Oldham. More than anything else, the discussions of the Moot revolved around the topic of order and, more particularly, around the problem of how order might be restored in British society and culture in the context of a ‘world turned upside down’. Oldham and most members of the group sought a central place for Christian ideas and ideals in British social life.

A striking feature of the Moot was the intellectual stature and the diversity of interests of its members. Among its 16 or so regular members were Oldham (1874-1969), his close friend T.S. Eliot (1888-1963) and Karl Mannheim (1893-1947). Among the later ‘visitors’ to Moot meetings was Michael Polanyi (1891-1976), who first came to the 20th Moot meeting in June of 1944.1

This article presents several papers that were produced for the Moot discussion of 15-18 December 1944 by Eliot, Mannheim and Polanyi. These papers have intrinsic and historical interest, and are published together for the first time here. The initial paper, written by Eliot, treats the role in society of ‘the clerisy’2 - a term borrowed from Samuel Taylor Coleridge that points to an intellectual elite or vanguard. Eliot requested that Oldham solicit responses to his paper from Mannheim and Polanyi. Mannheim’s response was a set of detailed answers to four questions that Eliot posed at the end of his essay. Polanyi’s response was a short, coherent essay, which he identified as ‘my own position with respect’ to Eliot’s discussion; his essay outlines a brief account of the role of the clerisy in science.3 Eliot wrote short comments on the responses of both Mannheim and Polanyi. These five pieces, which have a natural unity, should be of interest to anyone working in the history of social thought. We have abridged only Mannheim’s lengthy response and have eliminated a few lines of illustrative material from Eliot’s reply to Mannheim, but these excisions in no way detract from the clarity of the authors’ perspectives in this rich trilogue.

Musilian Concept of Modern Man

German-Austrian Robert Musil (1880-1942) is considered an artist with an extremely unorthodox conception of art to a basic human problem. In his time, there existed a dissociation of substance from social values. Musil actually started with this foundation in considering the taunting dilemma that the accelerating technology of the century is overstepping each day the ability of the human mind to adjust to it. Musil maintained that social organization, patterns of thought and cherished ideals correspond to a reality that no longer exists