Torsional vibrations in a shaft train of an air compressor: modification, calculation and measurement

2021 ◽  
Vol ahead-of-print (ahead-of-print) ◽  
Author(s):  
Matthias Humer ◽  
Stefan Habel
Keyword(s):  
Theory And Practice ◽  
Mode Shapes ◽  
Electrical Network ◽  
Damping Factor ◽  
Torsional Vibrations ◽  
Rotating Machines ◽  
Vibration Measurements ◽  
Content Type ◽  
Air Compressor ◽  
Calculation Results

Purpose Due to the installation of the new, more powerful gearbox and the dismantling of the exciter machine, the vibration characteristics of the shaft train will be changed. Therefore, it is necessary to reassess the shaft train. It is to be investigated if the shaft train of the compressor meets the general requirements for bending and torsional vibrations and can be safely operated within the electrical network. The purpose of this paper is to show the necessary alignment of modification, calculation and measurement in such a project.. Design/methodology/approach After some modification work on the shaft train of an air compressor, it was necessary to do some engineering calculations regarding the bending natural and torsional natural frequencies and their mode shapes. The correctness of the calculated values was proven by vibration measurements performed at the shaft train in operation. Findings It can be concluded that the change and replacement of rotating equipment in a shaft train never should be done without any engineering calculations in advance and measurements after the component modification. Most important is that the calculation results have to be compared with the measurement results for verifying the calculation assumptions. In the case described above, one can see that theory and practice match well. In addition to this, the very low damping of torsional vibrations is proved again, which can be a significant problem in some situations. Originality/value Also, today one can find torsional vibration measurements of rotating machines, including frequency, magnitude and damping factor, very seldom. Especially for smaller machines, there are no real comparisons between calculation and measurement are usual. This paper shows that an alignment between theoretical and practical approaches is necessary to avoid operational problems for rotating machines.

scholarly journals Unpacking the package

2015 ◽  
Vol 12 (4) ◽  
pp. 346-376 ◽  
Author(s):  
Mark Evans ◽  
Basil Phillip Tucker
Keyword(s):  
Organisational Change ◽  
Clean Energy ◽  
Management Control ◽  
Theory And Practice ◽  
Structured Interviews ◽  
Informal Control ◽  
Content Type ◽  
Energy Company ◽  
Management Controls ◽  
Control Package

Purpose – The purpose of this paper is to explore the ways in which both formal and informal control, operating as a package, are implicated in responding to organisational change arising from the introduction of the Australian Federal Government’s Clean Energy Act (2011). Design/methodology/approach – This investigation is based on a review of archival data, and semi-structured interviews conducted with 15 staff at different hierarchical levels within an Australian renewable energy company. Findings – Although formal management control systems and informal control both played important roles in the organisation’s reorientation to organisational change, it was the latter form of control that predominated over the former. The influence of the prevailing organisational culture, however, was pivotal in orchestrating both formal and informal control efforts within this organisation. Originality/value – This study contributes to management control theory and practice in two ways: first, it provides much needed empirical evidence about the ways in which management controls act as a package; second, it offers insights into the relative importance of the components of a management control package in the context of a particular organisational change. In addition, it responds to Laughlin’s (1991) call for empirical “flesh” to be added to the skeletal framework he advocates to make this conceptualisation of organisational change, “more meaningful”.

Dave Snowden on KM and big data/analytics: interview with David J. Pauleen

2017 ◽  
Vol 21 (1) ◽  
pp. 12-17 ◽  
Author(s):  
David J. Pauleen
Keyword(s):  
Big Data ◽  
Data Analytics ◽  
Big Data Analytics ◽  
Theory And Practice ◽  
Content Type ◽  
Face To Face ◽  
The Relationship ◽  
A Company ◽  
Practical Implications ◽  
Scientific Officer

Purpose Dave Snowden has been an important voice in knowledge management over the years. As the founder and chief scientific officer of Cognitive Edge, a company focused on the development of the theory and practice of social complexity, he offers informative views on the relationship between big data/analytics and KM. Design/methodology/approach A face-to-face interview was held with Dave Snowden in May 2015 in Auckland, New Zealand. Findings According to Snowden, analytics in the form of algorithms are imperfect and can only to a small extent capture the reasoning and analytical capabilities of people. For this reason, while big data/analytics can be useful, they are limited and must be used in conjunction with human knowledge and reasoning. Practical implications Snowden offers his views on big data/analytics and how they can be used effectively in real world situations in combination with human reasoning and input, for example in fields from resource management to individual health care. Originality/value Snowden is an innovative thinker. He combines knowledge and experience from many fields and offers original views and understanding of big data/analytics, knowledge and management.

Moderating role of patriotism on sales tax compliance among Jordanian SMEs

2020 ◽  
Vol 13 (3) ◽  
pp. 389-415 ◽  
Author(s):  
Ahmad Farhan Alshira'h ◽  
Hijattulah Abdul-Jabbar
Keyword(s):  
Tax Compliance ◽  
Arab Countries ◽  
Moderating Effect ◽  
Theory And Practice ◽  
Sales Tax ◽  
Deterrence Theory ◽  
Content Type ◽  
Tax Rate ◽  
Tax Audit ◽  
The Impact

Purpose The purpose of this paper is to investigate the impact of tax audit, tax rate and tax penalty on sales tax compliance and examine the moderating effect of patriotism on the associations between tax audit, tax rate and tax penalty with sales tax compliance among Jordanian manufacturing small- and medium-sized enterprises (SMEs). Design/methodology/approach In this study, 660 questionnaires were distributed by using systematic random sampling to manufacturing SMEs in Jordan, after which a total of 385 useable questionnaires were deemed suitable for analysis. Partial least squares structural equation modelling (PLS-SEM) was used to validate the measurement model and structural model and the predictive relevance of the study’s model. Findings The findings showed that tax audit and tax penalty were positively associated with the level of sales tax compliance, whereas tax rate was insignificantly associated with sales tax compliance. They also demonstrated the moderating significant effect of patriotism on the relationship between tax penalty, tax audit and tax rate with sales tax compliance. Research limitations/implications Tax authorities and policymakers in developing majority societies in developing countries and in other Arab countries, especially in Jordan may use the results to focus their interest on the formulation of policies founded on the outcomes of the study to strengthen eligible SMEs to comply to further boost their sales collections. Originality/value This study extends the deterrence theory in the context of sales tax compliance by proposing the moderating effect of patriotism in the deterrence theory on sales tax compliance among SMEs. Moreover, the suitability for the use of PLS-SEM as a statistical tool in investigating the extended deterrence theory with patriotism as a moderating variable as well as its implications for theory and practice was also discussed.

Journey towards best practices in acting on early warning signs in complex projects within a Russian context

2015 ◽  
Vol 8 (4) ◽  
pp. 828-843 ◽  
Author(s):  
Gulnara Sharaborova ◽  
Derek H.T. Walker ◽  
Guinevere Gilbert
Keyword(s):  
Early Warning ◽  
Point Of View ◽  
Warning Signs ◽  
Theory And Practice ◽  
Doctoral Study ◽  
Content Type ◽  
Early Warning Signs ◽  
Complex Projects ◽  
Research Findings ◽  
Phd Thesis

Purpose – The purpose of this paper is to provide a summary report and reflect on a recently passed PhD thesis (Sharaborova, 2014b) related to project management topics. Design/methodology/approach – This paper focussed on narrative reflection upon the completed doctoral journey. Findings – This paper presents the thesis findings, the research models, the guide in dealing with the early warning signs that developed as a result of this research and the contribution made to theory and practice. Research limitations/implications – Limitations of the research and the perspectives of the further diffusion of the research findings are considered. Originality/value – This TRN is a PhD candidate’s point of view as well as the opinions of the scientific research supervisors about the doctoral study and its outcome. The paper could be useful for novice researchers who wish to conduct their research and did not yet make a decision.

Coalition loyalty-programme adoption and urban commercial-network effectiveness evaluation

2014 ◽  
Vol 42 (9) ◽  
pp. 818-838 ◽  
Author(s):  
Ivan De Noni ◽  
Luigi Orsi ◽  
Luca Zanderighi
Keyword(s):  
Urban Areas ◽  
Dynamic Network ◽  
Theory And Practice ◽  
Evaluation Methodology ◽  
Marketing Theory ◽  
Urban Network ◽  
Content Type ◽  
Network Effectiveness ◽  
Commercial Network ◽  
Loyalty Programme

Purpose – To counter the proliferation of out-of-town shopping centres, a spontaneous or planned coalition loyalty programme (CLP), one involving most retailers in an urban network, may positively affect a town centre's capacity to entice customers and may enhance its competitiveness. The purpose of this paper is to assess the effectiveness of CLP implementation in town-centre management (TCM) as a tool for enhancing urban commercial-system attractiveness. Design/methodology/approach – The theoretical framework used in this study is supported by the evaluation methodologies of an empirical case study: the Savigliano Card project. CLP performance analysis uses a dynamic network-competitiveness index, an approach based on Laspeyres-type decomposition. The effects on each retailer's profitability are then tested by matching network and regression analyses. Findings – The results suggest that CLPs implementation in a TCM scheme can produce benefits and positive externalities for customers, retailers and urban areas. CLPs can influence a town centre's revitalisation process, improve the attractiveness of the urban commercial network and increase the profitability of private retailers by enhancing cross-selling dynamics. Practical implications – The paper provides a CLP performance-evaluation methodology and presents the benefits concerning CLP implementation in TCM strategies. Originality/value – This type of CLP is weakly exploited in marketing theory and practice; therefore, the paper provides theoretical and empirical explanations for the measurement of CLP effectiveness in TCM. In addition, it has significant implications for both practitioners and academics.

Propagation of risks and their impact on performance in fresh food retail

2015 ◽  
Vol 26 (3) ◽  
pp. 568-602 ◽  
Author(s):  
Samir K Srivastava ◽  
Atanu Chaudhuri ◽  
Rajiv K. Srivastava
Keyword(s):  
Supply Chain ◽  
Supply Chains ◽  
Performance Measures ◽  
Theory And Practice ◽  
Food Retail ◽  
Content Type ◽  
Fresh Food ◽  
Retail Supply Chains ◽  
And Performance ◽  
Supply Chain Risks

Purpose – The purpose of this paper is to carry out structural analysis of potential supply chain risks and performance measures in fresh food retail by applying interpretive structural modeling (ISM). Design/methodology/approach – Inputs were taken from industry experts in identifying and understanding interdependencies among food retail supply chain risks on different levels (sourcing and logistics outside the retail stores; storage and customer interface at the stores). Interdependencies among risks and their impact on performance measures are structured into a hierarchy in order to derive subsystems of interdependent elements to derive useful insights for theory and practice. Findings – Using the ISM approach the risks and performance measures were clustered according to their driving power and dependence power. Change in/inadequate government regulations’ are at the bottom level of the hierarchy implying highest driving power and require higher attention and focussed mitigation strategies. Risks like lack of traceability, transport delays/breakdowns and temperature abuse, cross-contamination in transport and storage have medium driver and dependence powers. Research limitations/implications – The approach is focussed on food retail supply chains in the Indian context and thereby limits the ability to generalize the findings. The academics and experts were selected on convenience and availability. Practical implications – It gives managers a better understanding of the risks and performance measures that have most influence on others (driving performance measures) and those measures which are most influenced by others (dependent performance measures) in fresh food retail and also a tool to prioritize them. This kind of information is strategic for managers who can use it to identify which performance measures they should concentrate on managing the trade-offs between measures. The findings and the applicability for practical use have been validated by both experts and practicing managers in food retail supply chains. Originality/value – The work is perhaps the first to link supply chain risks with performance and explains the propagation of risks in food retail supply chains. It contributes to theory by addressing a few research gaps and provides relevant managerial insights for practitioners.

Chinese workers’ responses to justice: quitting, collective action or both?

2018 ◽  
Vol 9 (1) ◽  
pp. 21-44
Author(s):  
Yucheng Zhang ◽  
Stephen J. Frenkel
Keyword(s):  
Collective Action ◽  
Social Exchange ◽  
Interactional Justice ◽  
Social Identification ◽  
Theory And Practice ◽  
Western China ◽  
Chain Model ◽  
Content Type ◽  
Service Employees ◽  
Chinese Workers

Purpose This paper aims to analyse two ways in which Chinese workers attempt to resist unjust treatment: exit through quitting and voice via collective action. This is in the context of rapid economic growth, rising economic inequality (Lu and Gao, 2011; Qin et al., 2009; Reed, 2012) and escalating industrial conflict (Pringle, 2011). Design/methodology/approach A model is developed and hypotheses formulated in the light of qualitative data analysis that included archival data, workplace observation and interviews with employees and managers at a large factory. A mediated chain model was tested based on a survey of 234 semi-skilled and skilled manual workers and 353 service employees employed in the same city in Western China. Findings Organisational identification and organisational cynicism were found to mediate the relationship between interactional justice and the two outcomes, intention to quit and collective opposition. Originality/value The authors’ interpretation of these relationships challenge previous research by showing that social identification is a more powerful explanation than social exchange in accounting for variations in these two outcomes. Implications are drawn for human resource theory and practice.

Rhetorically speaking: on white preservice teachers’ failure to imagine an anti-racist English education

2021 ◽  
Vol ahead-of-print (ahead-of-print) ◽  
Author(s):  
S.R. Toliver ◽  
Heidi Hadley
Keyword(s):  
Preservice Teachers ◽  
Thematic Analysis ◽  
Design Methodology ◽  
Teacher Educators ◽  
English Education ◽  
Theory And Practice ◽  
Education Programs ◽  
Content Type

Purpose This paper aims to identify how white preservice teachers’ inability to imagine an equitable space for Black and Brown children contributes to the ubiquity of whiteness in English education. Further, the authors contend that the preservice teachers’ responses mirror how the larger field of English education fails to imagine Black and Brown life. Design/methodology/approach Using abolitionist teaching as a guide, the authors use reflexive thematic analysis to examine the rhetorical moves their preservice teachers made to defer responsibility for anti-racist teaching. Findings The findings show preservice teachers’ rhetorical moves across three themes: failure to imagine Black and Brown humanity, failure to imagine a connection between theory and practice, and failure to imagine curriculum and schooling beyond whiteness. Originality/value By highlighting how preservice teachers fail to imagine spaces for Black and Brown youth, this study offers another pathway through which teacher educators, teachers and English education programs can assist their faculty and students in activating their imaginations in the pursuit of anti-racist, abolitionist teaching.

“Enabling circular business models in the fashion industry: the role of digital innovation”

2021 ◽  
Vol ahead-of-print (ahead-of-print) ◽  
Author(s):  
Phuc Hong Huynh
Keyword(s):  
Business Model ◽  
Circular Economy ◽  
Business Models ◽  
Digital Technologies ◽  
Theory And Practice ◽  
Chain Model ◽  
Fashion Industry ◽  
Digital Innovation ◽  
Content Type ◽  
Radical Innovations

PurposeDigital innovation and circular business model innovation are two critical enablers of a circular economy. A wide variety of digital technologies such as blockchain, 3D printing, cyber-physical systems, or big data also diverges the applications of digital technologies in circular business models. Given heterogeneous attributes of circular business models and digital technologies, the selections of digital technologies and circular business models might be highly distinctive within and between sectorial contexts. This paper examines digital circular business models in the context of the fashion industry and its multiple actors. This industry as the world’s second polluting industry requires an urgent circular economy (CE) transition with less resource consumption, lower waste emissions and a more stable economy.Design/methodology/approachAn inductive, exploratory multiple-case study method is employed to investigate the ten cases of different sized fashion companies (i.e. large, small medium-sized firm (SME) and startup firms). The comparison across cases is conducted to understand fashion firms' distinct behaviours in adopting various digital circular economy strategies.FindingsThe paper presents three archetypes of digital-based circular business models in the fashion industry: the blockchain-based supply chain model, the service-based model and the pull demand-driven model. Besides incremental innovations, the radical business model and digital innovations as presented in the pull demand-driven model may be crucial to the fashion circular economy transition. The pull demand–driven model may shift the economy from scales to scopes, change the whole process of how the fashion items are forecasted, produced, and used, and reform consumer behaviours. The paths of adopting digital fashion circular business models are also different among large, SMEs and startup fashion firms.Practical implicationsThe study provides business managers with empirical insights on how circular business models (CBMs) should be chosen according to intrinsic business capacities, technological competences and CE strategies. The emerging trends of new fashion markets (e.g. rental, subscription) and consumers' sustainable awareness should be not be neglected. Moreover, besides adopting recycling and reuse strategies, large fashion incumbents consider collaborating with other technology suppliers and startup companies to incubate more radical innovations.Social implicationsAppropriate policies and regulations should be enacted to enable the digital CE transition. Market patterns and consumer acceptances are considered highly challenging to these digital fashion models. A balanced policy on both the demand and supply sides are suggested. The one-side policy may fail CBMs that entail an upside-down collaboration of both producers and consumers. Moreover, it is perhaps time to rethink how to reduce unnecessary new demand rather than repeatedly producing and recycling.Originality/valueThe pace of CE research is lagging far behind the accelerating environmental contamination by the fashion industry. The study aims to narrow the gap between theory and practice to harmonise fashion firms' orchestration and accelerate the transition of the fashion industry towards the CE. This study examines diverse types of digital technologies in different circular business models in a homogeneous context of the fashion industry with heterogeneous firm types.

Is one good enough? Gauging brand love using a visual single-item measure

2021 ◽  
Vol ahead-of-print (ahead-of-print) ◽  
Author(s):  
Salim Moussa
Keyword(s):  
Concurrent Validity ◽  
Rating Scale ◽  
Reliability And Validity ◽  
Theory And Practice ◽  
Single Item ◽  
Brand Love ◽  
Content Type ◽  
Visual Rating ◽  
Product Categories ◽  
Willingness To Forgive

PurposeThough brand love is recognized as being an important marketing topic both for theory and practice, a gap still exists with regard to its operationalization. To bridge this gap, this paper proposes a single-item measure (SIM) that uses a visual rating scale (i.e., a rating scale combining verbal with nonverbal contents).Design/methodology/approachThree studies covering over 700 respondents and examining three international brands over three product categories were conducted to test the new measure.FindingsFindings provide consistent evidence for the reliability and validity of the proposed measure. They also demonstrate that brand love, as gauged by the new SIM, is good in predicting positive word of mouth, willingness to pay a higher price, and willingness to forgive brand mishaps.Research limitations/implicationsThe paper focuses on brand love mainly from a measurement perspective.Practical implicationsThis paper provides a practical and parsimonious tool to measure brand love.Originality/valueExtant SIMs of brand love are less than ordinal, content invalid, of unknown reliability, and of untested concurrent validity. This paper provides academics and practitioners alike with a SIM of brand love that is ordinal, content valid, and tested in terms of reliability and concurrent validity.

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