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Article
Publication date: 9 March 2015

Ruben Verborgh, Seth van Hooland, Aaron Straup Cope, Sebastian Chan, Erik Mannens and Rik Van de Walle

The purpose of this paper is to revisit a decade after its conception the Representational State Transfer (REST) architectural style and analyzes its relevance to address…

Abstract

Purpose

The purpose of this paper is to revisit a decade after its conception the Representational State Transfer (REST) architectural style and analyzes its relevance to address current challenges from the Library and Information Science (LIS) discipline.

Design/methodology/approach

Conceptual aspects of REST are reviewed and a generic architecture to support REST is presented. The relevance of the architecture is demonstrated with the help of a case study based on the collection registration database of the Cooper-Hewitt National Design Museum.

Findings

The authors argue that the “resources and representations” model of REST is a sustainable way for the management of web resources in a context of constant technological evolutions.

Practical implications

When making information resources available on the web, a resource-oriented publishing model can avoid the costs associated with the creation of multiple interfaces.

Originality/value

This paper re-examines the conceptual merits of REST and translates the architecture into actionable recommendations for institutions that publish resources.

Details

Journal of Documentation, vol. 71 no. 2
Type: Research Article
ISSN: 0022-0418

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Article
Publication date: 15 February 2013

S. Udhayakumar, P.V. Mohanram, P. Keerthi Anand and R. Srinivasan

Identifying the most probable natural resting orientation of a part, in automatic handling, helps in the effective design of feeder and orientation devices. For parts with…

Abstract

Purpose

Identifying the most probable natural resting orientation of a part, in automatic handling, helps in the effective design of feeder and orientation devices. For parts with complex geometries and topologies, it is not always intuitively apparent what the natural resting probability of each orientation is. The purpose of this paper is to determine, by theoretical methods, the probability of occurrence of each natural resting orientation of eight different typical sector shaped parts.

Design/methodology/approach

Probability of natural resting orientations were found using theoretical methods and drop test. Pearson's χ2 test was used to decide whether to accept or reject the expected data by comparing with the observed data.

Findings

Irrespective of dimensions and material, the most probable natural resting orientation was the same. Height of drop was influential in the probability of most probable natural resting orientation.

Research limitations/implications

The research does not include objects with minimum thickness (i.e. 2D objects).

Originality/value

The paper shows that determining the most probable natural resting orientation will help designers to design the part feeders effectively.

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Article
Publication date: 1 June 2005

Li‐teh Sun

Man has been seeking an ideal existence for a very long time. In this existence, justice, love, and peace are no longer words, but actual experiences. How ever, with the…

Abstract

Man has been seeking an ideal existence for a very long time. In this existence, justice, love, and peace are no longer words, but actual experiences. How ever, with the American preemptive invasion and occupation of Afghanistan and Iraq and the subsequent prisoner abuse, such an existence seems to be farther and farther away from reality. The purpose of this work is to stop this dangerous trend by promoting justice, love, and peace through a change of the paradigm that is inconsistent with justice, love, and peace. The strong paradigm that created the strong nation like the U.S. and the strong man like George W. Bush have been the culprit, rather than the contributor, of the above three universal ideals. Thus, rather than justice, love, and peace, the strong paradigm resulted in in justice, hatred, and violence. In order to remove these three and related evils, what the world needs in the beginning of the third millenium is the weak paradigm. Through the acceptance of the latter paradigm, the golden mean or middle paradigm can be formulated, which is a synergy of the weak and the strong paradigm. In order to understand properly the meaning of these paradigms, however, some digression appears necessary.

Details

International Journal of Sociology and Social Policy, vol. 25 no. 6/7
Type: Research Article
ISSN: 0144-333X

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Article
Publication date: 8 October 2019

Korti Mohammed Choukri, Korti Abdel Illah Nabil and Abboudi Said

High-pressure die casting is one of the manufacturing techniques used for the rational mass production of metal parts. Due to the high velocity of the molten metal during…

Abstract

Purpose

High-pressure die casting is one of the manufacturing techniques used for the rational mass production of metal parts. Due to the high velocity of the molten metal during the injection phase, the die casting of aluminum is so complex and it is almost impossible to calculate these exact performances. Numerical simulation is an effective way to optimize the injection phase and minimize air entrapment that causes porosity defects in the metal. Generally, the filling phase of the molten metal in the shot sleeve is neglected in most scientific work. This phase is followed by a rest period to allow the escape of the resident air bubbles (gravity effect). The paper aims to discuss these issue.

Design/methodology/approach

It is relatively clear that the model described poses a great challenge for numerical implementation, especially for 3D geometries. The governing transport equations are solved numerically using the commercial CFD solver Fluent and the equations are discretized using a pressure-based finite volume method. The coupling pressure–velocity was solved by the PISO algorithm. The PISO algorithm takes relatively more CPU time per solver iteration, but it significantly decreases the number of iterations required for the convergence of the transient flow problems. Laminar flow inside air and molten metal was assumed. In order to describe the behavior of the molten metal, a VOF model has been activated. The model makes it possible to account for the moving boundary due to the variation of the shot sleeve volume caused by the plunger displacement. The scheme used in the discretization of momentum equation was the first-order upwind scheme, and the scheme used for the pressure was the PRESTO. The profile of the plunger velocity, boundary conditions change with time and the physical properties change with liquid fraction were used by implementation of a user-defined function. For the discretization of the domain, an unstructured mesh with triangular elements is used. After conducting mesh sensitivity study, a mesh having 53,813 triangular elements has been chosen for the present study. The convergence criterion was set equal to 10–4 for all parameters.

Findings

The results show that the rest and global filling times increase by 2.5 and 8.57 percent with decreasing the pouring velocity by 10 percent. In addition, the rest and global filling times decrease by 5.77 and 8.12 percent with increasing the pouring velocity by 10 percent.

Originality/value

After the filling phase, it is necessary to offer a rest period before the injection phase. However, the rest and global filling times increase by 2.5 and 8.57 percent with decreasing the pouring velocity by 10 percent. In addition, the rest and global filling times decrease by 5.77 and 8.12 percent with increasing the pouring velocity by 10 percent. Increasing the pouring velocity by 10 percent leads increasing of the molten metal velocity in the shot sleeve and requires a delay of time of the beginning of the faster plunger movement by 7–10.5 percent. On the other hand, Figure 12 shows that increasing the pouring velocity requires increasing of the plunger velocity during the injection phase, thus increasing the pouring velocity. In order to overcome this problem, it is necessary to reduce the injection velocity and prolong the period of the slower plunger movement.

Details

Multidiscipline Modeling in Materials and Structures, vol. 15 no. 6
Type: Research Article
ISSN: 1573-6105

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The Handbook of Road Safety Measures
Type: Book
ISBN: 978-1-84855-250-0

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Abstract

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The Evolution of the British Funeral Industry in the 20th Century: From Undertaker to Funeral Director
Type: Book
ISBN: 978-1-78743-630-5

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Research on Professional Responsibility and Ethics in Accounting
Type: Book
ISBN: 978-0-76231-393-8

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Article
Publication date: 1 February 1970

Parker of, J. Cooke and J. Bridge

June 30, 1969 Master and servant — Contract of service — Lorry driver — Statutory rest period — Contractual option of cutting scrap during rest period — Whether “rest” …

Abstract

June 30, 1969 Master and servant — Contract of service — Lorry driver — Statutory rest period — Contractual option of cutting scrap during rest period — Whether “rest” — Road Traffic Act, 1960 (c.16), s. 73

Details

Managerial Law, vol. 7 no. 5
Type: Research Article
ISSN: 0309-0558

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Article
Publication date: 9 August 2013

José M. de la Torre‐Ruiz and J. Alberto Aragón‐Correa

The purpose of this paper is to examine how, within a team, the value of their best member depends critically on the performance of the rest. Analysis of the…

Abstract

Purpose

The purpose of this paper is to examine how, within a team, the value of their best member depends critically on the performance of the rest. Analysis of the interdependent team members complements the traditional focus of resource‐based‐view analyses of isolated resources.

Design/methodology/approach

The authors used data from 584 National Basketball Association teams (30 teams collected over 21 seasons).

Findings

The authors find a positive relationship between best member performance and team performance that increases as the rest of the team members’ performance improves.

Practical implications

Having team members with a high individual performance does not imply that the team will have a competitive advantage over the rest. To gain this advantage, it is also necessary that the rest of the team members also show a high individual performance.

Originality/value

These results contribute to the team literature increasing our knowledge about the effect of complementary resources on gaining competitive advantage. Additionally, sports teams offer the possibility of using objective data to assess team members’ individual value within a team.

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Article
Publication date: 26 February 2019

Debabrata Dutta and Somnath Ghosh

This paper aims to investigate the effect of delayed water curing on the mechanical and microstructural properties of fly ash-based geopolymer paste-blended with Ground…

Abstract

Purpose

This paper aims to investigate the effect of delayed water curing on the mechanical and microstructural properties of fly ash-based geopolymer paste-blended with Ground Granulated Blast Furnace Slag (GGBS) with different rest periods.

Design/methodology/approach

The blended geopolymer paste was composed of GGBS (15 per cent of the total weight) and the base material, Fly Ash (FA). The blended mix was activated by activator solution (Sodium hydroxide and Sodium silicate) containing 6 per cent Na2O of total base material. The effect of delayed water curing has been studied by gradually increasing the aging period (Rest Period) from 2 hours to 24 hours in the formation of activated outcome along with Calcium Silicate Hydrate (CSH). To analyze the mechanical and microstructural properties of the resultant blended geopolymer paste, compressive strength test, FESEM and XRD have been carried out. Moreover, a long-term durability test subjected to sulphate exposure has been performed to evaluate the durability of the designed sustainable geopolymer paste.

Findings

The present paper shows that the delayed water curing incorporates secondary heat input enhancing the partial polymer formation along with CSH. Slag-blended AAFA-based geopolymer paste is seen to exhibit quick setting property. Also, AAFA-based geopolymer paste samples subjected to longer rest period show early strength gain at a high rate under water curing as compared to those subjected to the shorter rest period.

Originality/value

To the best of authors’ knowledge, the effect of delayed water curing on the mechanical and microstructural properties of slag-blended AAFA-based geopolymer paste has not been studied before.

Details

World Journal of Engineering, vol. 16 no. 1
Type: Research Article
ISSN: 1708-5284

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