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Article
Publication date: 1 August 1981

Richard A. Lancioni and John F. Grashof

The year 1980, the decade of the 80s, twenty years until the year 2000. The next ten years may be among the most critical faced by American business, and physical…

Abstract

The year 1980, the decade of the 80s, twenty years until the year 2000. The next ten years may be among the most critical faced by American business, and physical distribution managers in particular, in our history. Further, the developments in physical distribution practice and management, and especially the way in which some of the critical problems are solved, will have impacts on the health and progress of business into the year 2000 and beyond. The following paragraphs address some of the critical problems and issues faced by physical distribution managers. Where possible recent trends which affect these concerns are identified and the potential development of these trends through the 1980s is traced.

Details

International Journal of Physical Distribution & Materials Management, vol. 11 no. 8
Type: Research Article
ISSN: 0269-8218

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Article
Publication date: 1 June 1972

Richard Lancioni and John Grashof

The physical distribution function of a firm is a complex process. It consists of all the activities involved in the flow of goods from the raw material supplier to the…

Abstract

The physical distribution function of a firm is a complex process. It consists of all the activities involved in the flow of goods from the raw material supplier to the final consumer and incorporates the major activity centres of purchasing, warehousing, transportation, order processing, and inventory control. The goal of a firm's distribution operation is to insure that established customer service levels are achieved at a minimum total cost.

Details

International Journal of Physical Distribution, vol. 3 no. 3
Type: Research Article
ISSN: 0020-7527

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Article
Publication date: 1 July 1997

Richard Lancioni and John Grashof

Reveals that physical distribution organization and information system development among US manufacturing firms is still in a period of transmission. Concludes that many…

Abstract

Reveals that physical distribution organization and information system development among US manufacturing firms is still in a period of transmission. Concludes that many problems have arisen because of the move towards the formalization of physical distribution management as an integral part of a firm’s management organization.

Details

International Journal of Physical Distribution & Logistics Management, vol. 27 no. 5/6
Type: Research Article
ISSN: 0960-0035

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Article
Publication date: 1 January 1986

Hussein M.A. Alawi

Self‐service food stores are a new emerging form of retail technology in Saudi Arabia. By focusing on relevant institutional, planning and operational dimensions, this…

Abstract

Self‐service food stores are a new emerging form of retail technology in Saudi Arabia. By focusing on relevant institutional, planning and operational dimensions, this exploratory study describes and analyses the process by which this form of food retailing was adopted. Data were collected from 96 stores located in three metropolitan areas of the Kingdom, and the results suggest that the sudden proliferation of these stores during the past decade was characterised by the lack of rational planning, short‐term decision making orientation, and limited concern for promotional activities. The analysis of the 62 study variables indicated that differences in store size exerted limited influence on store marketing activities and had a moderate effect on store planning and institutional dimensions.

Details

International Marketing Review, vol. 3 no. 1
Type: Research Article
ISSN: 0265-1335

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Article
Publication date: 1 August 1999

J. Orfi, N. Galanis and C.T. Nguyen

The fully developed laminar mixed convection flow in inclined tubes subject to axially and circumferentially uniform heat flux has been studied numerically for a…

Abstract

The fully developed laminar mixed convection flow in inclined tubes subject to axially and circumferentially uniform heat flux has been studied numerically for a Boussinesq fluid. Dual solutions characterized by a two‐ and a four‐vortex secondary flow structure in a cross‐section normal to the tube’s longitudinal axis have been found for different combinations of the Grashof number Gr and of the tube inclination α for all Prandtl numbers between 0.7 and 7. In the two‐parameter space defined by Gr and α dual solutions occur: at a given α, if the Grashof number exceeds a critical value Gr (for horizontal tubes Gr is approximately 5.5 × 105, 1.7 × 105 and 1.7 × 104 respectively for Pr = 0.7, 7 and 70); at a given Gr, if the tube inclination is below a critical value αc (for Gr = 106 this critical angle is approximately 62.5° and 83.5° respectively for Pr = 0.7 and 7). Numerical experiments carried out for developing flows indicate that the two‐vortex solution is the only stable flow structure.

Details

International Journal of Numerical Methods for Heat & Fluid Flow, vol. 9 no. 5
Type: Research Article
ISSN: 0961-5539

Keywords

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Article
Publication date: 15 June 2020

Nils Grashof, Alexander Kopka, Colin Wessendorf and Dirk Fornahl

This paper aims to show the interaction effects between clusters and cluster-specific attributes and the industrial internet of things (IoT) knowledge of a firm on the…

Abstract

Purpose

This paper aims to show the interaction effects between clusters and cluster-specific attributes and the industrial internet of things (IoT) knowledge of a firm on the innovativeness of firms. Cluster theory and the concept of key enabling technologies are linked to test their effect on a firm’s incremental and radical knowledge generation.

Design/methodology/approach

Quantitative approach at the firm-level. By combining several data sources (e.g. ORBIS, PATSTAT and German subsidy catalogue) the paper relies on a unique database encompassing 8,347 firms in Germany. Ordinary least squares (OLS)-regression techniques are used for data analysis.

Findings

Industrial IoT is an important driver of radical patents, mediated positively by firm size. For incremental knowledge, a substitution effect occurs between a cluster and IoT effects, which is bigger for larger firms and dependent on cluster attributes and firms’ outside connections.

Research limitations/implications

The paper opens up new research paths considering long-term disruptive effects of the industrial IoT compared to short-term effects on the innovativeness of firms within clusters. Additionally, it enables further research enriching the discussion about cluster attributes and how these affect ongoing processes.

Practical implications

Linking cluster theory and policy with Industry 4.0 raises awareness for being considerate in terms of funding and scrutinising one-size-fits-all approaches.

Originality/value

Connecting the concepts of a cluster and advanced manufacturing technologies as a proxy for industrial IoT, specifically focussing on both radical and incremental innovations is a new approach. Especially, taking into account the interaction effects between cluster attributes and the influence of industrial IoT on the innovativeness of firms.

Details

Competitiveness Review: An International Business Journal , vol. 31 no. 1
Type: Research Article
ISSN: 1059-5422

Keywords

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Article
Publication date: 9 October 2019

Bidemi Olumide Falodun and Adeola John Omowaye

This paper aims to address the problem of double-diffusive magnetohydrodynamics (MHD) non-Darcy convective flow of heat and mass transfer over a stretching sheet embedded…

Abstract

Purpose

This paper aims to address the problem of double-diffusive magnetohydrodynamics (MHD) non-Darcy convective flow of heat and mass transfer over a stretching sheet embedded in a thermally-stratified porous medium. The controlling parameters such as chemical reaction parameter, permeability parameter, etc., are extensively discussed and illustrated in this paper.

Design/methodology/approach

With the help of appropriate similarity variables, the governing partial differential equations are converted into ordinary differential equations. The transformed equations are solved using the spectral homotopy analysis method (SHAM). SHAM is a numerical method, which uses Chebyshev pseudospectral and homotopy analysis method in solving science and engineering problems.

Findings

The effects of all controlling parameters are presented using graphical representations. The results revealed that the applied magnetic field in the transverse direction to the flow gives rise to a resistive force called Lorentz. This force tends to reduce the flow of an electrically conducting fluid in the problem of heat and mass transfer. As a result, the fluid velocity reduces in the boundary layer. Also, the suction increases the velocity, temperature, and concentration of the fluid, respectively. The present results can be used in complex problems dealing with double-diffusive MHD non-Darcy convective flow of heat and mass transfer.

Originality/value

The uniqueness of this paper is the examination of double-diffusive MHD non-Darcy convective flow of heat and mass transfer. It is considered over a stretching sheet embedded in a thermally-stratified porous medium. To the best of the knowledge, a problem of this type has not been considered in the past. A novel method called SHAM is used to solve this modelled problem. The novelty of this method is its accuracy and fastness in computation.

Details

World Journal of Engineering, vol. 16 no. 6
Type: Research Article
ISSN: 1708-5284

Keywords

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Article
Publication date: 1 June 2001

Joseph Sarr, Mactar Sall, Mamadou Mansour Kane, Bassirou Ba and Michel Daguenet

The purpose of this paper is to compare the numerical laminar two‐dimensional unsteady natural convection in a partial sector‐shaped enclosure submitted respectively to a…

Abstract

The purpose of this paper is to compare the numerical laminar two‐dimensional unsteady natural convection in a partial sector‐shaped enclosure submitted respectively to a constant heat flux density q1 and a uniform temperature T1 on the inner cylindrical wall. The numerical model performed in this paper is applied more particularly for high Grashof numbers, in order to point out the advent and the development of pre‐turbulent flows. Results of numerical runs are presented. The mean Nusselt number on active walls is represented as a function of the Grashof number Gr and the aspect ratio Fr. The results may be correlated very well with an expression of the form \overlineNu = k1 Gr1k2, for technical calculations.

Details

International Journal of Numerical Methods for Heat & Fluid Flow, vol. 11 no. 4
Type: Research Article
ISSN: 0961-5539

Keywords

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Article
Publication date: 6 November 2017

Siva Reddy Sheri, Chamkha Ali. J. and Anjan Kumar Suram

The purpose of this paper is to analyze the thermal-diffusion and diffusion-thermo effects on magnetohydrodynamics (MHD) natural convective flow through porous medium in a…

Abstract

Purpose

The purpose of this paper is to analyze the thermal-diffusion and diffusion-thermo effects on magnetohydrodynamics (MHD) natural convective flow through porous medium in a rotating system with ramped temperature.

Design/methodology/approach

Using the non-dimensional variables, the flow governing equations along with corresponding initial and boundary conditions have been transformed into non-dimensional form. These non-dimensional partial differential equations are solved by using finite element method. This method is powerful and stable. It provides excellent convergence and flexibility in providing solutions.

Findings

The effects of Soret number, Dufour number, rotation parameter, magnetic parameter, Hall current parameter, permeability parameter, thermal Grashof number, solutal Grashof number, Prandtl number, thermal radiation parameter, heat absorption parameter, Schmidt number, chemical reaction parameter and time on the fluid velocities, temperature and concentration are represented graphically in a significant way and the influence of pertinent flow governing parameters on the skin frictions and Nusselt number are presented in tabular form. On the other hand, a comparison for validation of the numerical code with previously published work is performed, and an excellent agreement is observed for the limited case existing literature.

Practical implications

A very useful source of information for researchers on the subject of MHD flow through porous medium in a rotating system with ramped temperature.

Originality/value

The problem is moderately original, as it contains many effects like thermal-diffusion (Soret) and diffusion-thermo (Dufour) effects and chemical reaction.

Details

International Journal of Numerical Methods for Heat & Fluid Flow, vol. 27 no. 11
Type: Research Article
ISSN: 0961-5539

Keywords

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Article
Publication date: 1 September 1998

N.M. Al‐Najem, K.M. Khanafer and M.M. El‐Refaee

This paper numerically investigates the effect of the transverse magnetic field on flow field patterns and heat transfer processes in a tilted square cavity. The…

Abstract

This paper numerically investigates the effect of the transverse magnetic field on flow field patterns and heat transfer processes in a tilted square cavity. The horizontal walls of the enclosure are assumed to be insulated while the vertical walls are kept isothermal. The power law control volume approach is developed to solve the conservation equations at Prandtl number of 0.71. Validation tests with existing data demonstrate the ability of the present scheme to produce accurate results. The effects of Grashof number, enclosure inclination angle, and Hartmann number are also investigated. The study covers the range of the Hartmann number from 0 to 100, the enclosure inclination angle from 0° to ‐90° with Grashof number of 104 and 106. The effect of the magnetic field is found to suppress the convection currents and heat transfer inside the cavity. This effect is significant for low inclination angles and high Grashof numbers. Additionally, it is noted that there is no variation of average Nusselt number with respect to inclination angle for high Hartmann number.

Details

International Journal of Numerical Methods for Heat & Fluid Flow, vol. 8 no. 6
Type: Research Article
ISSN: 0961-5539

Keywords

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