Modeling and optimization of sand crushing plant using experimental design methodology

2019 ◽  
Vol 16 (4) ◽  
pp. 487-496
Author(s):  
Djamel Benyessad ◽  
Hamid Arkoub ◽  
Abdelghani Seghir
Keyword(s):  
Mathematical Model ◽  
Experimental Design ◽  
Design Methodology ◽  
Operating Conditions ◽  
Experimental Program ◽  
Operating Parameters ◽  
Content Type ◽  
Modeling And Optimization ◽  
Crushing Plant

Purpose The purpose of this paper is to present results of an experimental program conducted on manufacturing process of crushed sand. The aim of the research is to propose an optimized approach which allows to fix, directly at the process stage, the rate of fines in the produced crushed sand. Design/methodology/approach In the first step of the study, samples of crushed sand are collected in situ, at each adjustment of the identified operating parameters. They are then analyzed in laboratory to retrieve especially the fines contents for each adjustment. These adjustments are conducted for all possible combinations of the extremum operating conditions of the parameters. In the second step of the study, the experimental design technique is applied to study the influence of the different factors, and to model the interaction between them. An expression is obtained and subjected to statistical tests, and then it is confronted to other experimental measures. Findings Parameters influencing the fines rates are identified and their effects are analyzed. The domain of variation of three predominant parameters is defined allowing to conduct in situ experiments with minimal incidence on the manufacturing disturbance. A mathematical model is proposed to quantify the crushed sand fines by analytical expression that takes into account the interaction between influencing parameters. Practical implications The conducted experiments provided new data that will help to enhance and to better set up the settings of the parameters influencing the rate of filler. The proposed expression constitutes a practical tool for the manufacturer to fix the operating parameters values that results in a desired target fines contents. Originality/value Modeling and optimization of the sand crushing plant, considered here as a case study, has not been attempted previously. The conducted experiments and the proposed mathematical model constitute an original work of this study.

Power imbalance issues in athlete sponsorship versus endorsement in the context of a scandal

2014 ◽  
Vol 48 (5/6) ◽  
pp. 1070-1091 ◽  
Author(s):  
François Anthony Carrillat ◽  
Alain d’Astous
Keyword(s):  
Experimental Design ◽  
Design Methodology ◽  
Negative Impact ◽  
Balance Of Power ◽  
Brand Attitude ◽  
Power Imbalance ◽  
Content Type ◽  
Probabilistic Sample ◽  
A Company

Purpose – The purpose of this study is to contrast athlete endorsement vs athlete sponsorship from a power imbalance perspective when a scandal strikes the athlete. Design/methodology/approach – A first study was conducted with a probabilistic sample of 252 adult consumers where the type of brand–athlete relationship (endorsement or sponsorship) and the level of congruence between the two entities (low or high) were manipulated in a mixed experimental design. A second study with a probabilistic sample of 118 adult consumers was conducted to demonstrate that consumers perceive that the balance of power between the brand and the athlete is not the same in endorsement and sponsorship situations. Findings – The results of the first study showed that when an athlete is in the midst of a scandal, the negative impact on the associated brand is stronger in the case of an endorsement than in the case of a sponsorship. However, this occurs only when the brand–athlete relationship is congruent. The results of the second study showed that the athlete’s power relative to the brand is greater in an endorsement than in a sponsorship context. Research limitations/implications – The findings suggest that a company that worries about the possibility that the athlete with whom it wants to build a relationship be eventually associated with some negative event (e.g. a scandal) should consider sponsorship rather than endorsement as a strategy. Originality/value – This study is the first to compare the athlete endorsement and sponsorship strategies in general and the first to put forward the notion of power imbalance in brand–athlete partnerships, its impact on how the two entities are represented in consumers’ memory networks and the consequences on brand attitude when the athlete is associated with a negative event.

Hedonic experiences at heritage attractions: the visitor’s perspective

2021 ◽  
Vol ahead-of-print (ahead-of-print) ◽  
Author(s):  
Ana Carolina Bender ◽  
Manuela Guerreiro ◽  
Bernardete Dias Sequeira ◽  
Júlio Mendes
Keyword(s):  
Design Methodology ◽  
Theory And Practice ◽  
Structured Interviews ◽  
Content Type ◽  
Heritage Sites ◽  
Exploratory Approach ◽  
Hedonic Experience ◽  
Using Data

Purpose The purpose of this study is to explore the hedonic experience and its formation at heritage attractions. Design/methodology/approach A qualitative and exploratory approach was applied, using data from 21 semi-structured interviews and three in-situ focus groups. Findings Findings highlight that senses, imagery and emotions are stimulated by the physical landscape and by triggers of memorable experiences. Research limitations/implications To further explore this topic, a broader range of heritage attractions and perspectives from the diverse stakeholders involved in the management and consumption of these sites is needed. Originality/value Given the scarcity of research dedicated to the hedonic experience at heritage sites, this study provides a contribution by exploring the visitor’s perspective and points out relevant insights. As the hedonic feelings of pleasure, comfort and related affective responses impact the quality of memorable experiences, relevant implications for theory and practice are discussed.

scholarly journals Recapitulation of the relationship between economic thoughts and realities

2019 ◽  
Vol 2 (1) ◽  
pp. 123-135
Author(s):  
Hua Liang
Keyword(s):  
Economic History ◽  
Design Methodology ◽  
Economic Thought ◽  
Content Type ◽  
Economic Problems ◽  
Root Cause ◽  
New Ideas ◽  
Economic Thinking ◽  
The Relationship

Purpose It is rather common for China’s current academic circles to use western doctrines that originated in situ to explain China’s economic problems, a suspicion of scenario misplacement may thus arise. The root cause lies in the lack of reflection about the current relationship between economic thoughts and realities. The paper aims to discuss these issues. Design/methodology/approach Correctly understanding economic thoughts associated with the brand of “that era” and effectively deducing its characteristics is of great significance to finding new features of this era and constructing new ideas with the characteristics of “this era.” Findings This motif is exactly the keynote on which to base the study of economic history and economic thought. Originality/value In a period of major historical turning points, the economic realities on which the economic thinking about that era (the era of economists) relied was undergoing major changes, and re-emphasizing the ancient topic of the relationship between economic thoughts and economic realities became particularly urgent.

How to motivate opinion leaders to spread e-WoM on social media: monetary vs non-monetary incentives

2021 ◽  
Vol ahead-of-print (ahead-of-print) ◽  
Author(s):  
Manuela López ◽  
Maria Sicilia ◽  
Peeter W.J. Verlegh
Keyword(s):  
Social Media ◽  
Experimental Design ◽  
Design Methodology ◽  
Word Of Mouth ◽  
Negative Impact ◽  
Monetary Incentive ◽  
Opinion Leaders ◽  
Monetary Incentives ◽  
Content Type ◽  
Source Of Information

PurposeOpinion leaders are increasingly important as a source of information, with consumers judging them to be more credible than other media and more influential than other consumers. Thus, companies have an interest in engaging opinion leaders to post about products and brands, and the authors analyse different incentives for encouraging them to spread the word on social media (via electronic word-of-mouth [e-WoM]).Design/methodology/approachA 2 × 3 between-subjects experimental design was developed in which 359 technological opinion leaders (bloggers) participated. The authors manipulated the monetary incentive (money vs no money) and non-monetary incentives (information only vs return product vs keep product) offered in exchange for a brand post.FindingsVarious techniques for approaching opinion leaders are effective, but to differing degrees. Providing a product free of charge increases the likelihood that opinion leaders will post about it, and the highest intention to post is observed when they are allowed to keep the product. In contrast, giving money to opinion leaders could have an indirect negative impact on their intention to post through the expected negative reaction of followers.Originality/valueIt remains unclear how opinion leaders can best be encouraged to spread e-WoM, as incentives used for consumers may work differently for opinion leaders, who have followers that they want to maintain. The main contribution of this paper lies in its explanation of why opinion leaders react differently to monetary versus non-monetary incentives.

Asset market bubbles in an experiment with sequential information releases

2021 ◽  
Vol ahead-of-print (ahead-of-print) ◽  
Author(s):  
Brian D. Kluger
Keyword(s):  
Experimental Design ◽  
Probability Distribution ◽  
Design Methodology ◽  
Asset Price ◽  
Common Factors ◽  
Asset Market ◽  
Content Type ◽  
Present Design ◽  
Sequential Information ◽  
Fundamental Values

PurposeMuch of the author’s understanding of experimental asset market bubbles is based on the Smith, Suchanek and Williams (SSW) design. The purpose of this paper is to find alternative bubble-producing designs, which is a promising path for new insights.Design/methodology/approachThe Smith et al. (1988) experimental design has been widely used to study bubbles. This paper introduces a novel modification, where the asset has a binary liquidation value and no dividends. Dividends are replaced by the events affecting the liquidation value probability distribution.FindingsOverpricing is common and consistent with subject optimism concerning the random liquidation value. Bubbles are also observed, as the degree of overpricing often rises and then fall during the experiments. However, crashes where the asset price drops below fundamental values are not observed.Research limitations/implicationsSubject over optimism, speculation and/or subject confusion are possible bubble ingredients. More research is needed to determine how much the factors responsible for these bubbles differ from the factors responsible for the SSW design. However, it seems likely that there are at least some common factors given the structural similarities between the two designs.Originality/valueThe present design is novel and may provide a means to better generalize results from previous experiments based on the SSW design.

Simulation on an electro-hydrostatic actuator controlled by a high-pressure piezoelectric pump with a displacement amplifier

2021 ◽  
Vol ahead-of-print (ahead-of-print) ◽  
Author(s):  
Bin Wang ◽  
Nanyue Xu ◽  
Pengyuan Wu ◽  
Rongfei Yang
Keyword(s):  
Mathematical Model ◽  
High Pressure ◽  
Design Methodology ◽  
Characteristic Analysis ◽  
Piezoelectric Pump ◽  
Component Level ◽  
Content Type ◽  
Amplification Ratio ◽  
And Performance ◽  
System Characteristics

Purpose The purpose of this paper is to provide a new hydrostatic actuator controlled by a piezoelectric piston pump and to reveal its characteristics. Design/methodology/approach In this paper, a piezoelectric pump with passive poppet valves and hydraulic displacement amplifier is designed as a new control component in a hydrostatic actuator for high actuation capacity. A component-level mathematical model is established to describe the system characteristics. Simulation verification for cases under typical conditions is implemented to evaluate the delivery behavior of the pump and the carrying ability of the actuator. Findings By using the displacement amplifier and the passive distributing valves, simulation demonstrates that the pump can deliver flow rate up to 3 L/min, and the actuator controlled by this pump can push an object weighing approximately 50 kg. In addition, it is particularly important to decide a proper amplification ratio of the amplifier in the pump for better actuation performance. Originality/value The piezoelectric pump presented in this paper has its potential to light hydrostatic actuator. The model constructed in this paper is valid for characteristic analysis and performance evaluation of this pump and actuators.

scholarly journals Branded premiums in tourism destination promotion

2020 ◽  
Vol ahead-of-print (ahead-of-print) ◽  
Author(s):  
Shasha Wang ◽  
Arnold Japutra ◽  
Sebastián Molinillo
Keyword(s):  
Experimental Design ◽  
Design Methodology ◽  
The Body ◽  
Brand Name ◽  
Tourism Destination ◽  
Content Type ◽  
Body Of Knowledge ◽  
The Impact ◽  
Practical Implications

Purpose The purpose of this paper is to test the influence of branded premiums or branded free gifts (e.g. a free of charge suitcase of a well-recognised brand) on tourism destination promotion. Specifically, the impact of brand name and price value of a branded premium on promoting a tourism destination was examined. Design/methodology/approach This research uses two experiment-based studies, applying a between-group experimental design. Findings The results revealed that appreciation leads to intention to visit the promoted destination when the branded promotion is offered. When a destination promotional offer contains a branded premium, consumers respond more favourably to the brand name of the premium than the price value of the premium. This finding applies to consumers’ responses to both the destination and the premium. Research limitations/implications This research adds to the body of knowledge on tourism destination promotion and the branding literature, specifically with promotional and branded premiums. Practical implications Mutual benefits can be obtained by both tourism destination marketers and premium marketers. Originality/value This research highlights the importance of branded premiums in tourism destination promotional offers. This research also shows the influence of the price value of a premium’s brand name in a tourism destination promotional offer.

Management systems integration: survey results

2017 ◽  
Vol 34 (8) ◽  
pp. 1252-1294 ◽  
Author(s):  
Pedro Domingues ◽  
Paulo Sampaio ◽  
Pedro M. Arezes
Keyword(s):  
Design Methodology ◽  
Implementation Process ◽  
Integrated System ◽  
Iso 14001 ◽  
Management Systems ◽  
Content Type ◽  
Survey Results ◽  
The Common ◽  
Effective Integration

Purpose The purpose of this paper is to report the results from a survey carried out among Portuguese companies with their management systems (MSs) certified according to, at least two of the following standards: ISO 9001, ISO 14001 and OHSAS 18001. In addition, the results from a second survey conducted amid a group of experts that pointed out several aspects that impact on the integration level will be dissected. Design/methodology/approach The phenomenon of MSs integration is hardly transferable to a contained environment so some of the common research methods traditionally adopted include case studies, surveys, interviews and observation in situ. The findings from two surveys online among Portuguese companies and Portuguese experts are reported in the current paper. Findings The results suggest that a set of common characteristics is present on the majority of the surveyed companies. On first hand, there is evidence of an effective integration of the policies and the existence of an integrated system manager on the organizational structure of the companies. On the other hand, results suggest that training was provided to top management concerning integration issues, an integrating concept was taken into account during the implementation process and tools, and methods and objectives of the subsystems are aligned. Research limitations/implications This paper addresses the issues raised in the mainstream scientific bibliography through the collection of information amidst Portuguese companies. At this stage, it is not possible to infer at which extent the conclusions may be transferable to other geographic contexts. The small number of companies that completed the survey precludes the statistical generalization of the findings but the analytical generalization is not impaired. Originality/value The authors believe that the conclusions of this paper may aid both practioneers and scholars in the understanding of a complex but manageable organizational phenomenon. In addition, through the contents of this paper companies may collect information regarding the pertinent issues to address when developing their IMSs.

A numerical method for solving the physics-based model of IGBT with all free-carrier injection conditions in the base region

2017 ◽  
Vol 36 (6) ◽  
pp. 1653-1662 ◽  
Author(s):  
Jiajia Chen ◽  
Yuhan Ma ◽  
Shiyou Yang
Keyword(s):  
Mathematical Model ◽  
Numerical Model ◽  
Design Methodology ◽  
Free Carrier ◽  
Carrier Injection ◽  
Base Region ◽  
Content Type ◽  
Insulated Gate Bipolar Transistor ◽  
Proposed Model ◽  
Solution Methodology

Purpose The purpose of this paper is to provide an accurate model and method to simulate the transient performances of an insulated gate bipolar transistor (IGBT) in an arbitrary free-carrier injection condition. Design/methodology/approach A numerical model and method for solving the physics-based model, an ambipolar diffusion equation-based model, of an IGBT is proposed. Findings The results of the proposed model are very close to the tested ones. Originality/value A mathematical model for an IGBT considering all free-carrier injection conditions is introduced, and a numerical solution methodology is proposed.

Perceived interviewee anxiety and performance in telephone interviews

2018 ◽  
Vol 6 (3) ◽  
pp. 320-332 ◽  
Author(s):  
Debora Jeske ◽  
Kenneth S. Shultz ◽  
Sarah Owen
Keyword(s):  
Experimental Design ◽  
Design Methodology ◽  
Telephone Interview ◽  
Subjective Assessment ◽  
Audio Recording ◽  
Content Type ◽  
Telephone Interviews ◽  
And Performance ◽  
Practical Implications

Purpose The purpose of this paper is to focus on the role of interviewee anxiety as a predictor of perceived hireability (Study 1, n=82) and job suitability (Study 2, n=74). Design/methodology/approach Using an experimental design, participants were randomly allocated to one of two conditions (an audio recording of either a confident or anxious job candidate with identical scripts) and asked to take the role of an interviewer. Findings The anxious interviewee (played by an actor) was consistently rated as less hireable (in a combined sample based on Studies and 2), less suitable to the job and received less favorable hiring recommendations (as assessed in Study 2) than the confident interviewee (played by the same actor). Research limitations/implications The study was conducted with students who may have less interview experience than experienced interviewers. Practical implications The results suggest that anxiety has a negative biasing effect on perceived hireability and job suitability ratings. In other words, the behavioral manipulation of anxiety affects hireability ratings, independent of any subjective assessment of anxiety. Originality/value The findings provide evidence of an anxiety bias in telephone interview settings. The results highlight the importance of considering anxiety cues when training employment interviewers.

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