Search results

Numerical models of manufacturing processes are useful and provide insight for the practitioner; however, model verification and validation are a prerequisite for expedient application. This paper aims to detail the code-to-code verification of a thermal numerical model for the Bridgman solidification process of alloys in a two-dimensional axisymmetric domain, against an established commercial code (ANSYS Fluent); the work is considered a confidence building step in model development.

A grid sensitivity analysis is carried out to establish grid independence, and this is followed by simulations of two transient solidification scenarios: pulling rate step change and ramp input; the results of which are compared and discussed.

Good conformity of results is achieved; hence, the non-commercial model is code-to-code verified; in addition, the ability of the non-commercial model to deal with radial heat flow is demonstrated.

The ability of the home made model for Bridgman furnace solidification to deal with cases where significant radial heat transfer occurs in the sample was demonstrated. The introduction of front tracking to model the macroscopic growth of dendritic mush and the region of undercooled liquid is identified as the next step in model development.

Access to high-quality data is a challenge for humanitarian logistics researchers. However, humanitarian organizations publish large quantities of documents for various stakeholders. Researchers can use these as secondary data, but interpreting big volumes of text is time consuming. The purpose of this paper is to present an automated quantitative content analysis (AQCA) approach that allows researchers to analyze such documents quickly and reliably.

Content analysis is a method to facilitate a systematic description of documents. This paper builds on an existing content analysis method, to which it adds automated steps for processing large quantities of documents. It also presents different measures for quantifying the content of documents.

The AQCA approach has been applied successfully in four papers. For example, it can identify the main theme in a document, categorize documents along different dimensions, or compare the use of a theme in different documents. This paper also identifies several limitations of content analysis in the field of humanitarian logistics research and suggests ways to mitigate them.

The AQCA approach does not provide an exhaustive qualitative analysis of documents. Instead, it aims to analyze documents quickly and reliably to extract the contents’ quantifiable aspects.

Although content analysis has been used in humanitarian logistics research before, no paper has yet proposed an automated, step-by-step approach that researchers can use. It also is the first study to discuss specific limitations of content analysis in the context of humanitarian logistics.

To discuss the application of direct part marking identification (DPMI) using 2D matrix codes, the use of which is increasing in industries as diverse as automotive and medical instruments.Design/methodology/approach – The benefits of 2D codes are explained, emphasising that they have sufficient storage capacity to provide data for tracking a part during its manufacture and through the supply chain and allow traceability throughout its lifetime. It describes the operation of Cognex, one of the leading manufacturers of ID products and also the world's largest supplier of machine vision systems is Cognex. It explains that initially the electronics industry exploited Cognex' code reading technology and an application at a German board manufacturer is described. Another system, at a diesel engine injector manufacturer in France, has 42 Cognex systems reading 2D codes and guiding robots in assembly. Also described is a new range of Cognex hand‐held and fixed‐mount 1D and 2D code readers “loaded” with software that allows reading in difficult conditions and with degraded or partially obscured codes.Findings – The DPMI market has expanded into industries other than automotive, which has prompted Cognex to establish a new division of ID products.Originality/value – The paper emphasises the importance of 2D codes in product traceability and indicates how vision technology is being utilised to read these codes even under difficult conditions.

The purpose of this paper is to explore garment consumption decision processes of female consumers when they have the option to sew or purchase their clothing.

This research study presents a segment of the findings from a larger qualitative grounded theory study on women who choose to sew clothing for themselves (Martindale, 2017). This research analyzed the interview data pertaining to the unique sew or purchase decision-making process in which these consumers undertake as well as the related control over ready-to-wear consumption that sewing provides them.

The ability to sew resulted in a unique consumer decision-making process in regard to the clothing purchases due to the control it provided them over their ready-to-wear consumption. The women developed factors that they used to make the decision to sew or purchase. Over all the ability to sew provided them the option to sew or purchase clothing, allowing the women more control over their clothing selection specifically in regard to the garments body fit.

This study was limited to English-speaking women living in the North America. The qualitative data collected are specific to this sample which cannot be generalized to all female home sewers. Research involving a larger population of women from a larger geographic area is needed.

The newly developed sew or purchase model provides an understanding of the control that having the option to sew or purchase provides female consumers. The findings offer apparel industry professionals a new perspective on ready-to-wear consumer dissatisfaction. The investment that is made when a garment is sewn instead of purchased has the potential to increase wardrobe sustainability as the consumer experiences more attachment to the clothing they have made. The model serves a starting point for further exploration into other craft-related consumer decision behaviors.

Purchasing decisions of this nature have yet to be considered in published research. Exploring these women’s decisions who operate outside of typical consumer culture and developing a model for this consumer behavior explains a phenomenon not yet addressed by existing consumer consumption research.

Unprecedented transformations to the nature of work and organizations are compelling leadership and organization development scholars and practitioners to reexamine the relevance and utility existing models of leadership potential. While there exist several published leadership potential models, the range and intensity of environmental forces fundamentally changing the nature of work and organizations demands a revision of leadership potential. The purpose of this study is to develop a leadership potential model that reflects the current and emerging nature of work and leadership challenges while also providing organizations a practical tool for talent review processes, succession planning and leadership development practices.

This article presents a field study consisting of semistructured interviews with 45 leaders engaged in a highly complex, volatile and uncertain industry: US healthcare.

Our results illustrate a dynamic two-dimensional model of leadership potential that comprises both cognitive (analytical aptitude and learning agility) and behavioral (people savvy and leadership capability) competencies operating across micro- and macro-levels of influence.

The article concludes with a series of recommendations for how leadership and organization development professionals, executive teams and boards may utilize the model for leader assessment and selection practices, talent review and succession planning and talent development initiatives.

The proposed model of leadership potential offers several advancements to the field's existing theoretical frameworks. The proposed model highlights the criticality of competencies aligned with the changing nature of work, including collaboration skills, divergent thinking, environmental scanning and evaluating data in ambiguous contexts. The model diverges from the existing theory by establishing leader drive as a motivation to serve others and initiate sustainable changes in business operations.

A lack of standardisation in current robot systems makes off‐line programming difficult to attain. In Germany a system has been developed to help overcome the problem.

Advances in the design of image processing software and in the development of cameras with on‐board processing are changing the face of machine vision. A group of suppliers is now producing vision systems targeted directly at end‐users in the assembly plant.

The purpose of this paper is to add to the significant contributions of past research by assessing what the overall effectiveness of managerial training has been over a period of 50 years and by identifying changes in overall effectiveness during this time period. Additionally, this study aims to evaluate what the overall findings on the effectiveness of training has been based on study design and subgroups focusing on the equivalent of Kirkpatrick's famous learning, behavior, and results outcomes.

This study quantitatively integrates and extends the literature on management training through a meta‐analytic procedure. The resulting sample of past research includes studies from the time period between 1952 and 2002, representing 85 interventions and 4,779 subjects.

The results do not suggest a great deal of improvement in the effectiveness of managerial training from 1952 through 2002 and effect sizes have remained moderate. Additionally, outcome subgroup appears to moderate results. Specifically, programs implemented to achieve learning outcomes tended to have the largest effect sizes and were consistently significant relative to programs targeted at behavior and results outcomes.

The implications are directly related to the selection of evaluation methods for future studies assessing the effectiveness of managerial training programs. This implication is important to both the academic community and practitioners. The limitations of this study include the possible exclusion of past research and the heterogeneity of assessment methods used in past research, beyond the broad categories of objective and subjective assessment.

In addition to identifying the moderating effect of outcomes being measured, the main contribution of this study is that it covers a large time period. As a result, the analysis offers a more expanded view of managerial training over time.

This study aims to evaluate the melting process of the phase-change RT-35 material in a shell and tube heat exchanger saturated with a porous medium. Titanium porous media with isotropic and inhomogeneous structures are studied. The considered tubes in the shell and tube exchanger are made of copper with specific thicknesses. The phase-change material has a non-Newtonian behavior and follows the endorsed Carreau–Yasuda Model.

The enthalpy–porosity method is used for modeling of the melting process. The governing equations were transferred to their dimensionless forms. Finally, the equations are solved by applying the Galerkin finite element method.

The findings for different values of the relative permeability (K*) and permeability deviation angle (λ) are represented in the forms of charts, streamlines and constant temperature contours. The considerable effects of the relative permeability (K*) and deviation angle (λ) on the flow line patterns of the melting phase-change material are some of the significant achievements of this works.

This study was conducted using data from relevant research articles provided by reputable academic sources. The data included in this manuscript have not been published previously and are not under consideration by any other journal.

This paper aims to point out the critical problems in numerical verification of solidification simulation codes and the complexity of the verification and to propose and apply a procedure of generalized verification for macrosegregation simulation.

A partial verification of a finite‐volume computational model of macrosegregation in direct chill (DC) casting of binary aluminum alloys, including the coupled transport phenomena of heat transfer, fluid flow and species transport, is performed. The verification procedure is conducted on numerical test problems, defined as subproblems with respect to the complexity of the physical model, geometry, and boundary conditions. The studied cases are thermal convection with solidification in DC casting, thermal natural convection of a low‐Prandtl‐number liquid metal in a rectangular cavity and 1D directional solidification of a binary Al‐Cu alloy. Grid‐convergence studies, code comparison with an alternative Chebyshev‐collocation method, and comparison with a reference similarity solution are used for verification.

An excellent ability of the model to accurately resolve the thermal convection in the pertinent range of Prandtl and Rayleigh numbers is shown. Concerns regarding the solution of species transport in the mushy zone remain.

The proposed verification procedure is not completed in its entirety. Further verification of the solutal and thermosolutal convection problems is required.

This paper proposes verification techniques for complex coupled solidification problems involving significant convection in the melt.