Start-up and running forces on bulk solids feeders: experimental findings versus available models

Many different models have been postulated over the years for sizing of feeder drives; these models have different bases, some rationally based and others more rule-of-thumb. Experience of Jenike & Johanson and likewise of The Wolfson Centre in trouble-shooting feeder drives has shown that drive powers are often poorly matched, so there is clearly still some way to go towards establishing a universally-used reliable approach. This paper presents an on-going programme of work designed to measure feeder forces experimentally on a purpose designed testing rig, and to compare these against some of the best known available models, and also against a full size installation. One aspect which is novel is the monitoring of the transition between the “filling stress field” load on the feeder and the “flowing stress field” load.

Perceptions of Gender Group Variability in Majority and Minority Contexts Two Field Studies with Nurses and Police Officers

Two field studies demonstrated that majority and minority size moderate perceived group variability. In Study 1 we found an outgroup homogeneity (OH) effect for female nurses in the majority, but an ingroup homogeneity (IH) effect for a token minority of male nurses. In Study 2 we found similar effects in a different setting - an OH effect for policemen in the majority and an IH effect for policewomen in the minority. Although measures of visibility, status, and, especially, familiarity tended to show the same pattern as perceived variability, there was no evidence that they mediated perceived dispersion. Results are discussed in terms of group size, rather than gender, being moderators of perceived variability, and with reference to Kanter's (1977a, 1977b) theory of group proportions.

Using an anisotropic semivariogram of acoustic backscatter intensity to determine the effects of river and tidal forces on the spatial structure of the Gold River delta

Senior thesis written for Oceanography 445

Análisis de la influencia del conflicto interno armado sobre el territorio perteneciente a la comunidad indígena Wiwa, que habita en la vertiente norte de la Sierra Nevada de Santa Marta, en el periodo 2002-2006

Este Estudio de Caso cruza las variables de conflicto interno armado en la Sierra Nevada de Santa Marta, Colombia, y territorio indígena Wiwa, con el fin de mostrar la influencia que llegó a tener el conflicto en todos los ámbitos de la vida individual y sobre todo grupal de los Wiwa, quienes presentan una especial relación con el territorio; la afectación fue tan grande que los llevó a ser considerados pueblo indígena en vía de extinción. La investigación está centrada en el primer periodo del ex-Presidente Álvaro Uribe, cuatrienio en el cual los actores armados del conflicto (FARC, AUC, Fuerzas Militares y de Policía) aumentaron su accionar, sobre todo por lo estratégico que resulta tener dominio territorial en la Sierra, ya que esta zona del país perteneciente ancestralmente a los cuatro pueblos indígenas serranos, sirve como zona de resguardo de grupos armados, tiene suelos aptos para la ganadería, el cultivo de banano, palma, pero también para los cultivos ilícitos, la salida al mar permite el tráfico de armas y drogas, además de poseer muchas fuentes hídricas. Se muestra entonces el conflicto de intereses entre los mismos grupos armados, y el de los grupos armados con los Wiwa, quienes denunciaron el desprecio absoluto por su cultura y su pensamiento territorial. Además de ello se evidencia como mediante actos de terror y violencia se violaron los derechos humanos y se infringió el derecho internacional humanitario.

The role of location in knowledge creation and diffusion: evidence of centripetal and centrifugal forces in the City of London financial services agglomeration

In this paper we report on a major empirical study of centripetal and centrifugal forces in the City of London financial services agglomeration. The study sheds light on (1) the manner and magnitude of firm interaction in the agglomeration; (2) the characteristics of the agglomeration that aid the competitiveness of incumbent firms; and (3) the problems associated with agglomeration. In addressing these issues, we use the data to (1) test emerging theory that explains the high productivity and innovation of agglomerations in terms of their ability to generate and diffuse knowledge; and (2) evaluate the ‘end of geography’ thesis.

Banking regulation and market forces in Australia

The purpose of this paper is to use Kane's notion of the regulatory dialectic to analyse the changing nature of bank regulation in Australia. Throughout Australia's economic history, economic regulation of the Australian banking system has not been static but has responded to changes in technology, market forces, and the behaviour of regulated institutions. From this analysis, some inferences about general banking principles and policy can be made.

Drugs and police

Discusses the corruption-cloud hanging over the Victoria police drug squad. What does it mean for criminal investigations and trials? And, speaking more generally, what is it about the drugs-trade and the way the law deals with it - that can lead law enforcers down the wrong path?

Public satisfaction with police : the importance of procedural justice and police performance in police-citizen encounters

A large body of literature has demonstrated that when authorities use procedural justice with those they regulate, people will be more satisfied with those authorities and will be more willing to cooperate and comply with their directions and rules. In the context of policing, procedural justice has also been shown to be important for shaping citizens’ views about police legitimacy, their satisfaction with police and also in fostering cooperation with police. What remains largely unexamined, however, is whether the positive effect of procedural justice varies across different types of police–citizen encounters. Using survey data collected from a national sample of 1,462 Australians, the present study will examine the relative importance of procedural justice on overall ratings of police satisfaction across two types of police–citizen encounters (citizen-initiated contacts and police-initiated contacts). It will be shown that procedural justice is most important in police-initiated contacts, while police performance is most important in citizen-initiated contacts.

The relationship between job status, interviewing experience, gender, and police officers' adherence to open-ended questions

Purpose : The current study examined whether several factors related to the job and demographic profile of police officers are associated with adherence to best-practice guidelines when interviewing children.

Method : One hundred and seventy-eight police officers completed a standardized (simulated) interview regarding an allegation of abuse by a 5-year-old child. Immediately prior to this interview, details were obtained from the officers' regarding their job status, gender, interview experience, the timing and nature of prior training/supervision, and experience outside the policing profession with young children.

Results : The results showed that timing of training was the only factor that related to interview performance. The proportion of open-ended questions among participants who completed their interviewer training course less than 1 month prior to the simulated interview was better than those who completed the training earlier. Interestingly, the performance of the latter group was identical to that of a group of participants who had not yet received any formal interview training. The implications of the findings are discussed, along with directions for future research.

The 'wimple' : rippled deformation of a fluid drop caused by hydrodynamic and surface forces during thin film drainage

It is well-known that hydrodynamic pressures in a thin draining liquid film can cause inversion of the curvature of a drop or bubble surface as it approaches another surface, creating a so-called “dimple”. Here it is shown that a more complicated rippled shape, dubbed a “wimple”, can be formed if a fluid drop that is already close to a solid wall is abruptly pushed further toward it. The wimple includes a central region in which the film remains thin, surrounded by a ring of greater film thickness that is bounded at the outer edge by a barrier rim where the film is thin. This shape later evolves into a conventional dimple bounded by the barrier rim, which then drains in the normal way. During the evolution from wimple to dimple, some of the fluid in the thicker part of the film ring flows toward the central region before eventually draining in the opposite direction. Although the drop is pressed toward the wall, the central part of the drop moves away from the wall before approaching it again. This is observed even when the inward push is too small to create a wimple.