Search results

The paper aims to provide an approach to actively decrease the radiation of acoustic noise in synchronous machines.

Splitting regular three‐phase windings of synchronous machines into two independent three‐phase systems allows for an active influence of the current waveform if both winding systems are mutually displaced against each other. The harmonics content of each phase‐current varies due to the mutual inductive coupling with participating currents of both systems. Therefore, the ensuing force‐density distribution on the stator teeth varies accordingly. Resulting structure dynamics and furthermore the radiation of relevant harmonics of the acoustic noise are based on the mechanical excitation of considered force‐density distributions.

Configurations of mutual displacement of phase windings of both winding systems with significant decrease of mechanical deformation and emitted acoustic noise are found. Simulation methods to entirely describe and prove the behavior described are developed.

The proposed approach is developed for a particular synchronous machine. Other machine types are conceivable for analysis in the same manner. Tools need to be adapted. Universal and reliable statements regarding acoustic behavior depend on the mechanical restraint of the machine and may therefore vary.

Active force‐density distribution is used for the noise reduction of alternators in vehicle applications. Additionally, wind‐power generators are considered for the application of split stator winding systems to actively counteract inhomogeneous force distributions on the rotor, evoked by stalling of the propeller blades during pole passing.

Active force‐density modification by stator winding modifications allows for the decrease of noise radiation of electrical machines with rotating‐field windings. Innovative simulation methods developed may now replace prototyping partially.

To present a new approach for improvement and optimization of synchronous claw‐pole alternators without changing the general machine design.

Various changes on the magnetically relevant parts of the machine design have been discussed formerly to achieve improved electromagnetic and acoustic behavior. The electrical part of the machine is considered in this paper, varying the stator winding arrangement to achieve optimized behavior.

Provides information about motivation and the methodology of the optimization process. Presents the entire analysis, covering idea, technical and computational implementation as well as verification.

It describes a method based on the utilization of specific, partly self‐generated software, which perhaps limits its usefulness if mentioned tools are unavailable. However, the presented basic method is to be used generally.

This paper presents a promising approach to further optimize the design of synchronous claw‐pole alternators without major changes in the machine design.

The purpose of this paper is to propose a three-staged approach to configuration change management that uses a combination of complexity analysis, data visualization, and algorithmic validation to assist in validating configuration changes.

In order to accomplish the above purpose, the authors conducted a review of existing configuration management practices. This was followed by an in-depth case study of the configuration management practices of a major automotive OEM. The primary means of data collection for the case study were interviews, ethnographic study, and document analysis. Based on the results of the case study, a set of support tools is proposed to assist in the configuration management process.

Through the case study, the authors identified that the OEM used a configuration management method that largely represented the rule-based reasoning methods identified in the literature review. In addition, many of the associated challenges are present, primarily, the difficulty in making changes to the rule system and evaluating the changes.

The primary limitation is that the case study was based on a single OEM. However, the results are in line with other practices identified in the literature review. Therefore, it is expected that the findings and recommendations should hold true in other applications.

A set of configuration management tools and associated requirements are identified and defined that could be used to assist companies in the automotive industry, and perhaps others, in managing their option changes as they continue to move towards full mass customization of products.

The proposed approach for configuration management has not been seen in any other organization. The value of this paper is in the effectiveness of the proposed approach in assisting in the configuration change management process.

Small businesses are dominant in most economies and their owners likely experience high levels of distress. However, we have not fully explored how these common businesses meaningfully differ with respect to the stress process. Understanding the meaningful variations or subgroups (i.e., heterogeneity) in the small business population will advance occupational health psychology, both in research and practice (e.g., Schonfeld, 2017; Stephan, 2018). To systematize these efforts, the author identifies five commonly appearing “heterogeneity factors” from the literature as modifiers of stressors or the stress process among small business owners. These five heterogeneity factors include: owner centrality, individual differences, gender differences, business/ownership type, and time. After synthesizing the research corresponding to each of these five factors, the author offers specific suggestions for identifying and incorporating relevant heterogeneity factors in future investigations of small business owners’ stress. The author closes by discussing implications for advancing occupational health theories.

This paper aims to respond to increasing interest in the intersection between accounting and human rights and to explore whether access to information might itself constitute a human right. As human rights have “moral force”, establishing access to information as a human right may act as a catalyst for policy change. The paper also aims to focus on environmental information, and specifically the case of corporate water‐related disclosures.

This paper follows Griffin and Sen, who suggest that a candidate human right might be recognised when it is consistent with “founding” human rights, it is important and it may be influenced by societal action. The specific case for access to corporate water‐related information to constitute a human right is evaluated against these principles.

Access to corporate water‐related disclosures may indeed constitute a human right. Political participation is a founding human right, water is a critical subject of political debate, water‐related information is required in order for political participation and the state is in a position to facilitate provision of such information. Corporate water disclosures may not necessarily be in the form of annual sustainability reports, however, but may include reporting by government agencies via public databases and product labelling. A countervailing corporate right to privacy is considered and found to be relevant but not necessarily incompatible with heightened disclosure obligations.

This paper seeks to make both a theoretical and a practical contribution. Theoretically, the paper explores how reporting might be conceived from a rights‐based perspective and provides a method for determining which disclosures might constitute a human right. Practically, the paper may assist those calling for improved disclosure regulation by showing how such calls might be embedded within human rights discourse.

Shortages of personal protective equipment (PPE) across the United States at the start of the COVID-19 pandemic created entrepreneurial opportunities for sewists and makers. In the United States in March and April 2020, masks were not readily available to the general public from existing retailers and PPE for medical use was being rationed for healthcare workers. Sewists and crafters, professionals and amateurs alike, began making and selling and/or donating masks. For individuals with sewing skills and time, sewing and selling masks became a lifeline financially, personally, and socially. To understand the experiences of people who made and distributed handmade masks during the early months of the pandemic in the United States, an interdisciplinary team developed an online cross-sectional survey instrument using a qualitative-dominated approach with both open and closed questions. This chapter explores themes identified from a sample of 94 participants, predominantly female-identifying, who created an enterprise or added a product line to an existing business. The sample includes individuals who did not identify as a ‘creative entrepreneur’ prior to the pandemic but did identify as an entrepreneur after starting a mask-making venture. Informed by entrepreneurship literature, the authors observed that these nascent entrepreneurs articulated recognisable motivations for social entrepreneurship, showed signs of pre-existing entrepreneurial mindsets, and employed business models and marketing tactics of entrepreneurs, largely without any business training. Implications for the study include increased recognition of latent entrepreneurial readiness, interest of women in social entrepreneurship, and higher levels of business knowledge among women than previously recognised.

In decades since the Rio Summit, freshwater has become an increasingly prominent issue in the global arena and attention has turned to the role of the corporate sector. Various (predominantly voluntary) corporate water accounting standards currently exist, from water-related components in wide-ranging sustainability standards such as the Global Reporting Initiative through to standards specifically focused on water and/or a particular industry. While academic research on adoption of these standards is sparse, initial findings reveal generally poor water reporting in terms of both quality and quantity. In future, the major areas where reporting (and standards) could be improved are the provision of site-level water information and the assessment of water risk throughout the supply chain.

The risk-return relationship of real estate equities is of particular interest for investors, practitioners and researchers. The purpose of this paper is to examine, in an asset pricing framework, whether the systematic risk factors play a significantly different role in explaining the returns of listed real estate companies, compared to general equities.

Running the difference test of the Fama-French three-factor and the liquidity-augmented asset pricing model, the authors analyze the effect of the systematic risk factors related to market, size, BE/ME and liquidity in a time-series setting over the period July 1992 to June 2012. By applying the propensity score matching (PSM) algorithm, the authors bypass the “curse of dimensionality” of traditional matching techniques and identify a comparable control sample of general equities, in terms of the relevant firm characteristics of size, BE/ME and liquidity.

The empirical results indicate that European real estate equity returns load significantly differently on the size, value and liquidity factor, while the influence of the market factor seems to be equivalent. In addition, the authors find an economically and statistically significant underperformance of European real estate equities, after accounting for the diverging role of systematic risk factors. Running the conditional time-series regression, the authors further reveal that these findings are predominately caused by the divergent risk-return behavior of real estate equities in economic downturns.

Due to the diverging role of the systematic risk factors in pricing real estate equities, the authors provide evidence of potential diversification benefits for investors and portfolio managers.

This is the first real estate asset pricing study to dissect the unique risk-return relationship of real estate equities by employing propensity score matching.

Understanding the pricing of real estate equities is a central objective of real estate research. This paper aims to investigate the impact of liquidity on European real estate equity returns, after accounting for well-documented systematic risk factors.

Based on risk factors derived from general equity data, the authors extend the Fama-French time-series regression approach by a liquidity factor, using a pan-European sample of 272 real estate equities.

The empirical results indicate that liquidity is a significant pricing factor in real estate stock returns, even after controlling for market, size and book-to-market factors. In addition, the authors detect that real estate stock returns load predominantly positively on the liquidity risk factor, suggesting that real estate equities tend to behave like illiquid common equities. These findings are underpinned by a series of robustness checks. Running a comparative analysis with alternative factor models, the authors further demonstrate that the liquidity-augmented asset-pricing model is most appropriate for explaining European real estate stock returns.

The inclusion of sentiment and downside risk factors could provide further insights into real estate asset pricing in European capital markets.

This is the first study to examine the role of liquidity as a systematic risk factor in a pan-European setting.

The purpose of this paper is to understand how national institutional environments contribute to differences in life satisfaction between entrepreneurs and employees.

Leveraging person–environment fit and institutional theories and using a sample of more than 70,000 entrepreneurs and employees from 43 countries, the study investigates how the impact of entrepreneurial activity on life satisfaction differs in various environmental contexts. An entrepreneur’s life satisfaction arguably should increase when a high degree of compatibility or fit exists between his or her choice to be an entrepreneur and the informal and formal institutional environment.

The study finds that differences in life satisfaction between entrepreneurs and employees are larger in countries with high power distance, low uncertainty avoidance, extant entrepreneurship policies, low commercial profit taxes and low worker rights.

This study sheds new light on how entrepreneurial activity affects life satisfaction, contingent on the informal and formal institutions in a country that support entrepreneurship by its residents.