Search results

1 – 10 of 37
To view the access options for this content please click here
Article
Publication date: 1 March 2001

Richard William Adderley and Peter Musgrove

This paper provides an overview of the role computer software plays within police forces with particular attention paid to crime analysis and investigation computer…

Abstract

This paper provides an overview of the role computer software plays within police forces with particular attention paid to crime analysis and investigation computer systems. A distinction is made between major crime (e.g. murder, violent assault, rape, etc.) and volume crime (e.g. domestic burglary, shoplifting, etc.). Illustrative systems that are in practical use for tackling both major and volume crime are described. Particular attention is paid to the attempts that have been made to apply artificial intelligence techniques to tackling the volume crime of burglary. A topic of current research is the use of data mining techniques for automatically detecting patterns in reported crimes. The paper concludes by looking at the problems and benefits such systems may bring.

Details

Policing: An International Journal of Police Strategies & Management, vol. 24 no. 1
Type: Research Article
ISSN: 1363-951X

Keywords

To view the access options for this content please click here
Article
Publication date: 4 March 2021

Delei Zhu and Shaoxian Bai

The purpose of this paper is to acquire sealing properties of supercritical CO2 (S-CO2) T-groove seal under ultra-high-speed conditions by thermo-elastohydrodynamic…

Abstract

Purpose

The purpose of this paper is to acquire sealing properties of supercritical CO2 (S-CO2) T-groove seal under ultra-high-speed conditions by thermo-elastohydrodynamic lubrication (TEHL) analysis.

Design/methodology/approach

Considering the choked flow effect, the finite difference method is applied to solve the gas state equation, Reynolds equation and energy equation. The temperature, pressure and viscosity distributions of the lubricating film are analyzed, and sealing characteristics is also obtained.

Findings

The face distortions induced by increasing rotational speed leads to the convergent face seal gap. When the linear velocity of rotation exceeds 400 m/s, the maximum temperature difference of the sealing film is approximately 140 K, and the viscosity of CO2 is altered by 17.80%. Near the critical temperature point of CO2, while the seal temperature increases by 50 K, the opening force of the T-groove non-contact seal enhances by 20% and the leakage rate declines by 80%.

Originality/value

The TEHL characteristics of the T-groove non-contact seal are numerically analyzed under ultra-high-speed, considering the real gas effect and choked flow effect. In the supercritical conditions, the influence of rotational speed, seal temperature, seal pressure and film thickness on sealing performance and face distortions is analyzed.

Details

Industrial Lubrication and Tribology, vol. ahead-of-print no. ahead-of-print
Type: Research Article
ISSN: 0036-8792

Keywords

To view the access options for this content please click here
Article
Publication date: 15 September 2020

Delei Zhu and Shaoxian Bai

The purpose of this study is to determine the sealing performance of face seals by numerical analysis of thermoelastohydrodynamic characteristics of supercritical CO2 (S-CO…

Abstract

Purpose

The purpose of this study is to determine the sealing performance of face seals by numerical analysis of thermoelastohydrodynamic characteristics of supercritical CO2 (S-CO2) spiral groove face seals in the supercritical regime.

Design/methodology/approach

The spiral groove face seal was used as the research object. The distribution of lubricating film pressure and temperature was analysed by solving the gas state, Reynolds and energy equations using the finite difference method. Furthermore, the influence law of sealing performance was obtained.

Findings

Close to the critical temperature of S-CO2, face distortions produced by increasing pressure lead to divergent clearance and resulted in reduced opening force. In the state of S-CO2, the face distortions generated by increasing seal temperature lead to convergent clearance, which enhances the opening force. In addition, near the critical temperature of S-CO2, the opening force may be reduced by 10%, and the leakage rate of the seal sharply increases by a factor of four.

Originality/value

The thermoelastohydrodynamic characteristics of supercritical CO2 face seals are illustrated considering the actual gas effect including compressibility, heat capacity and viscosity. Face distortions and sealing performance were calculated under different seal pressures and seal temperatures in the supercritical regime, as well as with N2 for comparison.

Peer review

The peer review history for this article is available at: https://publons.com/publon/10.1108/ILT-05-2020-0169/

Details

Industrial Lubrication and Tribology, vol. 73 no. 1
Type: Research Article
ISSN: 0036-8792

Keywords

To view the access options for this content please click here
Book part
Publication date: 3 October 2015

Flora Farago, Kay Sanders and Larissa Gaias

This chapter draws on developmental intergroup theory, parental ethnic-racial socialization literature, anti-bias curricula, and prejudice intervention studies to address…

Abstract

This chapter draws on developmental intergroup theory, parental ethnic-racial socialization literature, anti-bias curricula, and prejudice intervention studies to address the appropriateness of discussing race and racism in early childhood settings. Existing literature about teacher discussions surrounding race and racism is reviewed, best practices are shared, and the need for more research in this area is highlighted. The construct of parental ethnic-racial socialization is mapped onto early childhood anti-bias classroom practices. The chapter also outlines racial ideologies of teachers, specifically anti-bias and colorblind attitudes, and discusses how these ideologies may manifest in classroom practices surrounding race and racism. Colorblind ideology is problematized and dissected to show that colorblind practices may harm children. Young children’s interpretations of race and racism, in light of children’s cognitive developmental level, are discussed. Additionally, findings from racial prejudice intervention studies are applied to teaching. Early literacy practices surrounding race and racism are outlined with practical suggestions for teachers and teacher educators. Moreover, implications of teacher practices surrounding race and racism for children’s development, professional development, and teacher education are discussed.

To view the access options for this content please click here
Article
Publication date: 1 January 1978

JAMES A. CONWAY

This study attempted to clarify the relationship of power of school heads and participation of English teachers in school decisions. A deliberate sample of eight schools…

Abstract

This study attempted to clarify the relationship of power of school heads and participation of English teachers in school decisions. A deliberate sample of eight schools was drawn from the schools in the northwest of England. The major criteria for selection were: size (medium to large); location(urban‐suburban and reasonably accessible from Manchester); and representatives of the types of schools found in that geographic area. A descriptive analysis indicated that English teachers do perceive themselves participating in most decision areas. At a second level of analysis the relationship between status and intensity of participation was computed with r = .544 for the 103 members of staff (p<.001). An implication is that competence is a criterion for status position, leading to involvement and hence power in the social system. The final analysis dealt with implications of use of power from a description of participation patterns. The clusterings found lend credence to the belief that English heads are controlling those areas of power where tangible rewards and punishments are evident. They appear to be supporting participatory management in such other areas as those where teachers do not desire involvement or those which carry minimal expenditure of organizational resources.

Details

Journal of Educational Administration, vol. 16 no. 1
Type: Research Article
ISSN: 0957-8234

To view the access options for this content please click here
Article
Publication date: 22 June 2012

David Limond

The purpose of this paper is to encourage re‐reading and re‐evaluation of a series of educational polemics published in the UK in the 1960s and 1970s, the Black Papers…

Abstract

Purpose

The purpose of this paper is to encourage re‐reading and re‐evaluation of a series of educational polemics published in the UK in the 1960s and 1970s, the Black Papers. These works proposed, for the most part, avowedly conservative views on education: condemning so‐called “progressive” teaching methods and the re‐organisation of secondary schools in the UK (especially England) into non‐selective comprehensives. It is argued, however, that much said and written about the Black Papers since has concentrated only on selected “high profile” contributors, to the neglect of other contributors, often anonymous, whose comments were sometimes more measured/thoughtful.

Design/methodology/approach

The work proceeds first by re‐visiting the facts surrounding the writing of the Black Papers and their critical reception. It then analyses the nature of the contributors and describes selected essays not usually referred to when the Black Papers are discussed by historians and others.

Findings

The work finds that the Black Papers are often infuriatingly and unhelpful polemical in nature but that much written about them since has concentrated only on selected contributors, ignoring others who were more measured.

Originality/value

The work is perhaps the first critical re‐reading of the Black Papers in any depth in several decades. It does not simply dismiss them as hysterical rants by ill‐informed authors and suggests that they re‐pay careful attention, despite their often polemical nature.

Details

History of Education Review, vol. 41 no. 1
Type: Research Article
ISSN: 0819-8691

Keywords

To view the access options for this content please click here

Abstract

Details

The Emergence of Teacher Education in Zambia
Type: Book
ISBN: 978-1-78756-560-9

To view the access options for this content please click here
Article
Publication date: 1 January 1976

RICHARD J. BATES

Using material from contemporary New Zealand experience as a case study, this paper presents a functional analysis of the organizational problems facing secondary schools…

Abstract

Using material from contemporary New Zealand experience as a case study, this paper presents a functional analysis of the organizational problems facing secondary schools, develops a typology of dilemmas posed as a result of these problems, and discusses the manner in which various educational agencies, including the central Department, Teachers' Organizations and the recent Educational Development Conference have attempted to persuade schools to resolve these dilemmas in particular ways. Comments are also made on the internal characteristics of schools which may influence their resolution of these dilemmas in different ways thus leading to a growing heterogeneity within the state educational system.

Details

Journal of Educational Administration, vol. 14 no. 1
Type: Research Article
ISSN: 0957-8234

To view the access options for this content please click here
Article
Publication date: 1 January 1980

A.M. BADCOCK

With the objective of identifying the combinations of principal—deputy principal leadership styles perceived to be most effective in Victoria's State high schools, style…

Abstract

With the objective of identifying the combinations of principal—deputy principal leadership styles perceived to be most effective in Victoria's State high schools, style was defined in terms of task and relationship orientation. Fieldler's semantic differential scales for measuring orientation and atmosphere were adopted. The expectations of a groups of Education Department inspectors and administrators were utilised in the development of an effectiveness scale. Principal—deputy principal partnerships in which at least one of the two leaders was oriented towards tasks were perceived to be more effective than combinations in which neither was oriented towards tasks. Obversely, combinations in which relationship orientation was absent were seen as more effective than combinations in which relationship orientation was present. In the breakdown of schools by their atmosphere scores, the general finding linking task orientation with perceived effectiveness was replicated in the group of schools having the least‐favourable atmosphere.

Details

Journal of Educational Administration, vol. 18 no. 1
Type: Research Article
ISSN: 0957-8234

To view the access options for this content please click here
Book part
Publication date: 1 May 2020

Brendan P. Carmody

Abstract

Details

The Emergence of Teacher Education in Zambia
Type: Book
ISBN: 978-1-78756-560-9

1 – 10 of 37