Search results

1 – 10 of over 3000
Per page
102050
Citations:
Loading...
Access Restricted. View access options
Article
Publication date: 18 April 2017

Shahrain Mahmood, A.J. Qureshi, Kheng Lim Goh and Didier Talamona

This paper aims to investigate the tensile strength of partially filled fused filament fabrication (FFF) printed parts with respect of cross-sectional geometry of partially filled…

336

Abstract

Purpose

This paper aims to investigate the tensile strength of partially filled fused filament fabrication (FFF) printed parts with respect of cross-sectional geometry of partially filled test pieces. It was reported in the authors’ earlier work that the ultimate tensile strength (UTS) is inversely proportional to the cross-sectional area of a specimen, whereas the number of shells and infill density are directly proportional to the UTS with all other parameters being held constant. Here, the authors present an in-depth evaluation of the phenomenon and a parametric model that can provide useful estimates of the UTS of the printed part by accounting for the dimensions of the solid floor/roof layers, shells and infills.

Design/methodology/approach

It was found that partially filled FFF printed parts consist of hollow sections. Because of these voids, the conventional method of determining the UTS via the gross cross-sectional area given by A = b × h, where b and h are the width and thickness of the printed part, respectively, cannot be used. A mathematical model of a more accurate representation of the cross-sectional area of a partially filled part was formulated. Additionally, the model was extended to predict the dimensions as well as the lateral distortion of the respective features within a printed part using input values from the experimental data.

Findings

The result from this investigation shows that to calculate the UTS of a partially filled FFF part, the calculation based on the conventional approach is not sufficient. A new meta-model is proposed which takes into account the geometry of the internal features to give an estimate of the strength of a partially filled printed part that is closer to the value of the strength of the material that is used for fabricating the part.

Originality/value

This paper investigates the tensile strength of a partially filled FFF printed part. The results have shown that the tensile strength of a partially filled part can be similar to that of a solid part, at a lower cost: shorter printing time and lower material usage. By taking into account the geometries within a printed part, the cross-sectional area can be accurately represented. The mathematical model which was developed would aid end-users to predict the tensile strength for a given set of input values of the process parameters.

Details

Rapid Prototyping Journal, vol. 23 no. 3
Type: Research Article
ISSN: 1355-2546

Keywords

Access Restricted. View access options
Article
Publication date: 16 January 2017

Shahrain Mahmood, A.J. Qureshi, Kheng Lim Goh and Didier Talamona

This paper aims to discuss the effect of changes of a comprehensive list of process parameters on part scalability and tensile strength of fused filament fabrication (FFF) printed…

838

Abstract

Purpose

This paper aims to discuss the effect of changes of a comprehensive list of process parameters on part scalability and tensile strength of fused filament fabrication (FFF) printed parts. A number of parameters hitherto not studied such as cross-sectional area and its interaction with number of shells and infill density are presented and studied.

Design/methodology/approach

From a preliminary investigation, results have shown that varying the process parameters affects the ultimate tensile strength (UTS) of a FFF printed component, with component scale and number of shells as the two most significant parameters affecting the UTS. A further investigation based on the interactions of four process parameters, specimen width, b, specimen thickness, h, number of shells, n, and infill density, i, and their effects on the UTS was performed. Taguchi’s design of experiment was used to develop an experimental plan in this investigation. Specimens were printed and tested for their tensile strength until fracture and the results analyzed.

Findings

Results obtained support an inverse relationship between part scalability, change in cross-sectional area and the UTS of a FFF printed part. The UTS results were calculated in line with conventional method based on the gross cross-sectional area of A = (b × h).

Originality/value

The paper investigates the effect of part scalability on the UTS of FFF printed parts and evaluates the conventional method of calculating material tensile strength of FFF printed parts using the gross cross-sectional area of A = (b × h). The results of this findings show that the conventional method cannot be used as FFF printed parts consists of partially filled parts and not a solid component.

Details

Rapid Prototyping Journal, vol. 23 no. 1
Type: Research Article
ISSN: 1355-2546

Keywords

Access Restricted. View access options
Book part
Publication date: 4 September 2024

Aamer Al Aflak and Priya Vij

Purpose: Green consumerism is on the rise in the 21st century, impelling businesses to prioritise environmental awareness and expand eco-products to keep up with the growing…

Abstract

Purpose: Green consumerism is on the rise in the 21st century, impelling businesses to prioritise environmental awareness and expand eco-products to keep up with the growing demand. This research examines how social media (SM) and moral obligations (MO) affect consumer views and their propensity to make eco-friendly choices.

Methodology: Data were gathered from 508 participants using an adaptive questionnaire. The proposed model was tested using ‘structural equation modelling’.

Findings: The results show that electronic word-of-mouth (EWOM) and the intent to acquire green goods favourably impact consumer behaviour. MO positively influences attitudes and intentions to make green purchases (GPI), with attitudes acting as a mediator between MO and GPI.

Implications: This research is of utmost importance for marketers wanting to enhance their SM communication strategies to influence consumers’ opinions of green products and raise the possibility that they would make environmentally conscious purchases.

Details

Sustainability Development through Green Economics
Type: Book
ISBN: 978-1-83797-425-2

Keywords

Access Restricted. View access options
Book part
Publication date: 25 January 2023

Wangoo Lee, Jan Dul and Zsofia Toth

Necessary conditions represent the factors that cannot be compensated but must be present to aim the desired outcome; if a necessary condition is absent, the outcome will not…

Abstract

Necessary conditions represent the factors that cannot be compensated but must be present to aim the desired outcome; if a necessary condition is absent, the outcome will not exist. This logic of necessity causality differs from the conventional logic that has been evaluated by the methods drawing the lines “through the middle of the data” (e.g., regression and SEM). The authors argue that the empirical investigation of necessity causality has been largely ignored in hospitality and tourism literature although the notion of necessary causes for achieving certain outcomes is widespread throughout the studies. Thus, the authors introduce “necessary condition analysis” (NCA) as a suitable analytical method to identify necessary conditions in hospitality and tourism research. This chapter provides details on the underlying logic, key advantages, and an illustrative example of NCA. The chapter concludes by offering a few recommendations for future NCA applications in hospitality and tourism research.

Details

Cutting Edge Research Methods in Hospitality and Tourism
Type: Book
ISBN: 978-1-80455-064-9

Keywords

Access Restricted. View access options
Book part
Publication date: 29 October 2018

Hassan Raza, Brad van Eeden-Moorefield, Joseph G. Grzywacz, Miriam R. Linver and Soyoung Lee

The current longitudinal study investigated the within- and between-person variance in work-to-family conflict and family-to-work conflict among working mothers over time. It also…

Abstract

The current longitudinal study investigated the within- and between-person variance in work-to-family conflict and family-to-work conflict among working mothers over time. It also examined the effects of a nonstandard work schedule and relationship quality on work-to-family conflict and family-to-work conflict using bioecological theory. Results of multilevel modeling analyses showed that there was significant within- and between-person variance in work-to-family conflict and family-to-work conflict. The linear and quadratic terms were significantly related to family-to-work conflict, whereas the quadratic term was significantly associated with work-to-family conflict. There was also a positive relationship between a nonstandard work schedule and work-to-family conflict, whereas relationship quality was negatively associated with family-to-work conflict. Future studies should consider diversity among working mothers to adequately predict work–family conflict. The current study provides important implications for employers to consider, concerning within-and between-person differences among working mothers, which could in turn allow for accommodations and help to decrease work–family conflict.

Details

The Work-Family Interface: Spillover, Complications, and Challenges
Type: Book
ISBN: 978-1-78769-112-4

Keywords

Access Restricted. View access options
Book part
Publication date: 10 October 2017

Francisco H. G. Ferreira, Deon Filmer and Norbert Schady

Conditional cash transfers (CCT) have been adopted in many countries over the last two decades. Although the impacts of these programs have been studied extensively, understanding…

Abstract

Conditional cash transfers (CCT) have been adopted in many countries over the last two decades. Although the impacts of these programs have been studied extensively, understanding of the economic mechanisms through which cash and conditions affect household decisions remains incomplete. In particular, relatively little is known about the effects of these programs on intra-household allocation decisions. This chapter uses evidence from a program in Cambodia, where eligibility varied substantially among siblings in the same household, to illustrate these effects. A simple model of schooling decisions highlights three different effects of a child-specific CCT: an income effect, a substitution effect, and a displacement effect. The model predicts that such a CCT should unambiguously increase enrollment for eligible children, but have an ambiguous effect on ineligible siblings. The ambiguity arises from the interaction of a positive income effect with a negative displacement effect. These predictions are shown to be consistent with evidence from Cambodia, where the CESSP Scholarship Program (CSP) makes modest transfers, conditional on school enrollment for children of middle-school age. Scholarship recipients were more than 20 percentage points more likely to be enrolled in school, and 10 percentage points less likely to work for pay. However, the school enrollment and work of ineligible siblings was largely unaffected by the program. A possible fourth effect, operating through non-pecuniary spillovers of the intervention among siblings, remains largely outside the scope of the analysis, although there is some tentative evidence to suggest that it might also be at work.

Details

Research on Economic Inequality
Type: Book
ISBN: 978-1-78714-521-4

Keywords

Available. Open Access. Open Access
Article
Publication date: 31 December 2014

Jinsoo Lee

This paper examines the effectiveness of the three macro-prudential measures introduced by the Korean government in 2010 and 2011: (i) introduction of limit for FX forward…

230

Abstract

This paper examines the effectiveness of the three macro-prudential measures introduced by the Korean government in 2010 and 2011: (i) introduction of limit for FX forward positions of domestic banks and foreign bank branches, (ii) reintroduction of tax on foreign investors' earnings from Korean government bonds, and (iii) imposition of macro-prudential stability levy on non-deposit foreign currency liabilities appeared in bank balance sheets. The results show that the three measures were not successful: The limits of FX forward position did not lead to the decrease in foreign borrowings. The reintroduction of the tax did not reduce foreign investments in Korean government bonds. Lastly, the levy on non-deposit foreign currency liabilities did not lower the foreign borrowings from the banks and did not result in more financing through deposits for banks. The ineffectiveness of the capital flow management system in controling the amount of foreign capital flows implies that the system might not be effective in mitigating the pressure on exchange rate caused by excessive volatility of foreign capital flows.

Details

Journal of International Logistics and Trade, vol. 12 no. 3
Type: Research Article
ISSN: 1738-2122

Keywords

Access Restricted. View access options
Book part
Publication date: 26 August 2019

Kim Abildgren

Empirical studies on household-level inflation inequality have so far only focused on periods with positive inflation rates. However, the major concern on the policy agenda since…

Abstract

Empirical studies on household-level inflation inequality have so far only focused on periods with positive inflation rates. However, the major concern on the policy agenda since the most recent financial crisis has been deflation rather than inflation. This naturally raises the question regarding the effect of deflation on the distribution of real income when households spend their budget on different consumption bundles. This chapter compiles annual household-level inflation rates in Denmark from 1930 to 1935 based on microdata from the Expenditure and Saving Survey of 1931 and price data from the official Retail Price Index. The results indicate that lower-income households faced a larger decline in prices on their consumption of goods and services during the deflation years 1930–1932 than higher-income households did. The deflation thus contributed to narrowing the difference in real incomes between the top and bottom parts of the income distribution during the recession. In the years 1933–1935 with positive inflation rates, the lower-income households experienced higher inflation rates than higher-income households. Over the period 1930–1935 seen as a whole, the price development contributed slightly to reducing real income inequality. The low degree of medium-term persistence of differences in household-specific inflation rates is consistent with previous findings in various time periods from the 1960s to the 2000s without any persistent deflation events. The chapter at hand is the first empirical study of the direct distributional effects of price developments at the household level in a period with persistent deflation.

Available. Content available
Article
Publication date: 22 October 2024

Christopher Pich and Guja Armannsdottir

Brand image remains a “nebulous” construct with very few frameworks dedicated to understanding the process of uncovering brand image. This is supported by explicit calls for…

403

Abstract

Purpose

Brand image remains a “nebulous” construct with very few frameworks dedicated to understanding the process of uncovering brand image. This is supported by explicit calls for greater clarity on how to examine brand image, particularly in different settings. Political branding is one setting that has received some attention, however, research has focused on “party” political brands and neglected “non-party” brands (independent candidates). Therefore, this study aims to examine how young citizens interpret independent non-party brands through the theoretical lens of brand image in the context of Guernsey and develop a systematic brand image framework that provides greater clarity to this topic area.

Design/methodology/approach

A qualitative interpretivist approach using focus group discussions was adopted to investigate the phenomenon from the perspective of young voters 18–24 years of age. Focus group discussions ceased upon reaching theoretical saturation and a six-staged thematic analytical strategy was adopted to analyse the findings.

Findings

This study revealed deep insight into the political brand image of non-party brands from the perspective of young voters in an under-explored context. More specifically, this study uncovered that Guernsey’s political brands were seen as “accessible”; however, there was little differentiation, identification and connection between young voters and politicians. Further, this study uncovered a series of opportunities for strategists such as the desire for a younger generational view and younger representation in the Guernsey Parliament and greater clarity, distinction and authenticity related to political brand image.

Originality/value

This study addresses explicit calls for further research on brand image with a distinct focus on non-party political brands. Further, this study concludes by presenting the “consumer brand image schema”; a systematic framework which can be used to uncover brand image within and beyond the setting of politics. Further, the framework operationalises the complex concept of brand image and provides a three-stage process to examine and develop brand image. This will enable strategists to develop targeted strategies and adopt appropriate tactics to manage brand image to ensure brands are differentiated and interpreted as authentic, relatable, engaging, accessible and identifiable.

Details

Qualitative Market Research: An International Journal, vol. 28 no. 1
Type: Research Article
ISSN: 1352-2752

Keywords

Access Restricted. View access options
Article
Publication date: 18 June 2021

Chuanyuan Zhou, Zhenyu Liu, Chan Qiu and Jianrong Tan

The conventional statistical method of three-dimensional tolerance analysis requires numerous pseudo-random numbers and consumes enormous computations to increase the calculation…

200

Abstract

Purpose

The conventional statistical method of three-dimensional tolerance analysis requires numerous pseudo-random numbers and consumes enormous computations to increase the calculation accuracy, such as the Monte Carlo simulation. The purpose of this paper is to propose a novel method to overcome the problems.

Design/methodology/approach

With the combination of the quasi-Monte Carlo method and the unified Jacobian-torsor model, this paper proposes a three-dimensional tolerance analysis method based on edge sampling. By setting reasonable evaluation criteria, the sequence numbers representing relatively smaller deviations are excluded and the remaining numbers are selected and kept which represent deviations approximate to and still comply with the tolerance requirements.

Findings

The case study illustrates the effectiveness and superiority of the proposed method in that it can reduce the sample size, diminish the computations, predict wider tolerance ranges and improve the accuracy of three-dimensional tolerance of precision assembly simultaneously.

Research limitations/implications

The proposed method may be applied only when the dimensional and geometric tolerances are interpreted in the three-dimensional tolerance representation model.

Practical implications

The proposed tolerance analysis method can evaluate the impact of manufacturing errors on the product structure quantitatively and provide a theoretical basis for structural design, process planning and manufacture inspection.

Originality/value

The paper is original in proposing edge sampling as a sampling strategy to generating deviation numbers in tolerance analysis.

Details

Assembly Automation, vol. 41 no. 4
Type: Research Article
ISSN: 0144-5154

Keywords

1 – 10 of over 3000
Per page
102050