Search results

This article is aims to inform aircraft propulsion system designers of the implications which fundamental power distribution design assumptions have on the effectiveness and viability of turboelectric distributed propulsion (TeDP) systems. Improvements and challenges associated with selecting alternating or direct current for normal- and superconducting distribution systems are presented. Additionally, for superconducting systems, the benefits of bi-polar DC distribution are discussed, as well as the implications of operating voltage on the mass and efficiency of TeDP grid components.

The approach to this paper selects several high-level fundamental configuration decisions, which must be made, and it qualitatively discusses potential implications of these decisions.

Near term TeDP architectures which employ conventionally conducting systems may benefit from alternating current (AC) distribution concepts to eliminate the mass and losses associated with power conversion. Farther term TeDP concepts which employ superconducting technologies may benefit from direct current (DC) distribution to reduce the cryocooling requirements stemming from AC conduction losses. Selecting the operating voltage for superconducting concepts requires a divergence from the present day criteria employed with terrestrial superconducting transmission systems.

The criteria presented in the paper will assist in the early conceptual architecting of TeDP systems.

The governing principles behind the configuration of multi-MW airborne electrical microgrid systems are presently immature. This paper represents a unique look and the motivating principles behind fundamental electrical configuration decisions in the context of TeDP.

The purpose of this paper is to highlight and discuss the unique safety and protection requirements for the electrical microgrid system in a turboelectric distributed propulsion aircraft.

The NASA N3-X concept aircraft requirements were considered. The TeDP system was decomposed into three subsystems: turbogenerator, distribution system and propulsors. Unique considerations for each of these subsystems were identified.

The fail-safe requirements for a TeDP system require a divergence from the standard safety case used for conventional propulsion systems. Advantages in flight control and single-engine-out scenarios can be realized using TeDP. Additionally, a targeted use of energy storage and reconfigurability may enable seamless response to propulsion systems failures.

The concepts discussed in this paper will assist to guide the early conceptual and preliminary design and evaluation of TeDP architectures.

The safety case for TeDP architectures is currently immature. The work presented here acts to frame some of the major issues when designing, evaluating and verifying TeDP conceptual architectures.

Building a bioeconomy requires efficient technology transfer and global linkages to exploit finite intellectual property exclusivity periods. The purpose of this paper, using a resource‐based view lens, is to assess the priorities, capabilities, and competitiveness of the emerging New Zealand (NZ) bioeconomy.

A triangulated design was used that involved four focus groups, 27 interviews, five case studies, and survey of 176 NZ biotechnology industry participants from a broad range of backgrounds such as scientists, managers, and investors.

Two high‐priority capabilities were identified as being critical to fostering a competitive bioeconomy – access to talent and access to funding. Participants also identified the critical role of government in building and coordinating infrastructure, enabling critical capabilities, and accelerating bi‐directional technology and capital flows.

Most biotechnology research and data has focused on the USA and European Union. This is one of the first studies of NZ biotechnology participants, and insights gained within this context are potentially applicable for increasing our understanding of building biotechnology industries outside established clusters.

Value co-creation thinking is reshaping the understanding of markets and marketing and presents a significant opportunity to develop the theory and practice of social marketing. However, whilst value co-creation offers thought-provoking new directions for the field, applying this theory and its core concepts in social marketing is not without significant challenges. The paper aims to discuss these issues.

This is a conceptual paper that seeks to integrate lessons from social marketing practice with the value co-creation discourse from commercial marketing. Drawing upon two projects that have applied principles of collaboration and co-design, the paper provides a critical perspective on the adoption of value co-creation in social marketing.

The collaborative and emancipatory ambitions of co-creation seem highly compatible with social marketing. However, the paper notes some significant conceptual, ethical and practical obstacles in the path of a workable theory of value co-creation for social marketing.

While representation of value co-creation and other collaborative approaches is increasing in the social marketing literature, this is the first attempt to provide an integrated and critical review of their compatibility with social marketing at a conceptual, ethical and theoretical level. The analysis shows that value co-creation theory can simultaneously offer opportunities and present obstacles for social marketing.

The purpose of this study is to explore the struggle for entry and career success of the early pioneer women accountants in Great Britain and its former colonies the USA, Canada, Australia and New Zealand.

A career crafting matrix guides the analysis of historical information available on five pioneer women accountants in order to understand their success in gaining entry into the profession and their subsequent careers.

Despite an exclusionary environment, career crafting efforts coupled with family and organizational support enabled these women to become one of the first female accountants in their respective countries. Their struggles were not personal but much broader—seeking social, political, economic and professional empowerment for women.

This is the first paper to utilize the career crafting matrix developed from current female accountants' careers to explore careers of pioneering female accountants. It adds to the limited literature on women actors in accounting and may provide insight into approaching current forms of difference and discrimination.

This chapter develops a model of professionalism via a synthesis of three extant theories from the sociology of the professions literature. Nine components or conditions of the model are used to trace the historical development of public accountancy through an Early Era from 1850 to 1929 and a Modern Era from 1930 to the mid-1980s. The conclusion is that concerted efforts over an approximate 130 year period were needed for accountancy to achieve elite professional status in the eyes of the U.S. public. The question remaining is if accountants have forgotten the history lessons on what has been required to achieve and sustain elite professional status?

Using a sample of 304 Certified Public Accountants (CPAs), this paper investigates gender differences in moral development and personal value preferences of CPAs. We used the Defining Issues Test (DIT) to measure moral development, the Rokeach Value Survey (RVS) (Rokeach, 1973) to determine value preferences, and the Musser and Orke (1992) typology to determine value type preferences. The typology analysis indicates that all CPAs in our sample prefer personal values to social values. From an overall ethical predisposition standpoint, males and females are more alike than different; yet, there were a few notable differences. Specifically, males prefer competence values and females have higher preference for moral values. For example, while male CPAs exhibit higher priorities for the competence values of imaginative and logical, female CPAs exhibit higher priority for the moral value of loving. We also find a gender effect for moral development, where female CPAs significantly outscore their male counterparts.

The purpose of this paper is to develop weights of key performance areas (KPAs) and performance indicators for public private partnerships (PPPs) in Bangladesh. Since a variety of PPP arrangements is observable, different performance measurement approaches exist in the literature. However, analysing the relative importance of indicators influencing the performance score of particular projects using the perspective of developing countries remains unexplored.

The authors’ method involves application of the analytical hierarchy process (AHP) to develop weights for eight KPAs for which 41 contributing performance indicators have been developed. In total, 68 respondents (62 per cent of the PPP practitioners in Bangladesh) participated in a structured questionnaire survey and their judgements have been found to be consistent, using consistency ratios, a geometric consistency index and one-way ANOVA test.

“Feasibility analysis”, “life cycle evaluation and monitoring” and “optimal risk allocation” are the most significant performance indicators in Bangladesh. “Financing” is the most important KPA, followed by “planning and initiation” and “transparency and accountability”. Interestingly, unlike the cost, time and quality measures of the public sector comparator analysis used in most developed countries, a different set of indicators and KPAs are found dominant.

This suggests that performance indicators and their weights may differ for developing countries. Future research could usefully focus on testing this model in different countries and applying it to derive performance scores for individual PPPs.

An application of AHP in determining weights of the performance indicators represents a major contribution to the literature on PPP performance measurement in the developing countries including Bangladesh.