Search results

This study aims to investigate the effects of propeller locations on the aerodynamic characteristics of a generic 55° swept angle sharp-edged delta wing unmanned aerial vehicle (UAV) model.

A generic delta-winged UAV model has been designed and fabricated to investigate the aerodynamic properties of the model when the propeller is placed at three different locations. In this research, the propeller has been placed at three different positions on the wing, namely, front, middle and rear. The experiments were conducted in a closed-circuit low-speed wind tunnel at speeds of 20 and 25 m/s corresponding to 0.6 × 10⁶ and 0.8 × 10⁶ Reynolds numbers, respectively. The propeller speed was set at constant 6,000 RPM and the angles of attack were varied from 0° to 20° for all cases. During the experiment, two measurement techniques were used on the wing, which were the steady balance measurement and surface pressure measurement.

The results show that the locations of the propeller have significant influence on the lift, drag and pitching moment of the UAV. Another important observation obtained from this study is that the location of the propeller can affect the development of the vortex and vortex breakdown. The results also show that the propeller advance ratio can also influence the characteristics of the primary vortex developed on the wing. Another main observation was that the size of the primary vortex decreases if the propeller advance ratio is increased.

There are various forms of UAVs, one of them is in the delta-shaped planform. The data obtained from this experiment can be used to understand the aerodynamic properties and best propeller locations for the similar UAV aircrafts.

To the best of the author’s knowledge, the surface pressure data available for a non-slender delta-shaped UAV model is limited. The data presented in this paper would provide a better insight into the flow characteristics of generic delta winged UAV at three different propeller locations.

The aim of this paper is to investigate whether undergraduate students in the College of Health Sciences in Niger Delta University are information literate, and to determine whether they are aware of and use different information resources including electronic ones, and to assess their ability to evaluate information before use.

Questionnaire and interview methods were used to collect data from the students.

The students mostly rely on textbooks, medical journals, the internet, colleagues, and the Nigerian National University Commission's virtual library for information. They rarely use electronic resources such as MEDLINE, HINARI, the Cochrane Library, and EbscoHost. This could be because of a lack of awareness and skills necessary to search databases. Problems such as lack of time, the challenge of locating “good citable stuff”, inability to use effectively the medical library, and poor skills in information searching were mentioned. The study recommends that medical librarians and faculty should collaborate in integrating information literacy skills into the medical school curriculum.

This paper may help inform discussion about students' competences for locating, selecting, evaluating and using information essential for lifelong learning.

With the increasing concerns about food management, attention is placed on the monitoring of different potential risk factors for food handling. Therefore, the purpose of this paper is to propose a system that helps facilitate and improve the quality of decision making, reduces the level of substandard goods, and facilitates data capturing and manipulation, to help a warehouses improve quality assurance in the inventory‐receiving process with the support of technology.

This system consists of three modules, which integrate the radio frequency identification (RFID) technology, case‐based reasoning (CBR), and fuzzy reasoning (FR) technique to help monitor food quality assurance activities. In the first module, the data collection module, raw warehouse and work station information are collected. In the second module, the data sorting module, the collected data are stored in a database. In this module, data are decoded, and the coding stored in the RFID tags are transformed into meaningful information. The last module is the decision‐making module, through which the operation guidelines and optimal storage conditions are determined.

To validate the feasibility of the proposed system, a case study was conducted in food manufacturing companies. A pilot run of the system revealed that the performance of the receiving operation assignment and food quality assurance activities improved significantly.

In summary, the major contribution of this paper is to develop an effective infrastructure for managing food‐receiving process and facilitating decision making in quality assurance. Integrating CBR and FR techniques to improve the quality of decision making on food inventories is an emerging idea. The system development roadmap demonstrates the way to future research opportunities for managing food inventories in the receiving operations and implementing artificial intelligent techniques in the logistics industry.

This paper seeks to illustrate designation of a real‐time oil spill monitoring and management system using computer system, GIS models, internet and a variety of other technologies.

Appropriate models in GIS, together with monitoring technologies and internet‐based communication infrastructure, facilitate oil spill early warning, situational analysis, risk analysis and damage analysis in addition to management and disaster response in real‐time. The system architect includes command and control module, designed for managing and coordinating oil spill accidents response. The structure also includes an accident data dissemination scheme, through an internet portal which distributes disaster thematic products and facilitates communication between oil spill disaster players and the administration office.

The functionality of such a system through its components including database, central repository, disaster models, command and control and communication schemes covers all the stages of spill management before, during, and after an accident.

The system acts as a single umbrella of control and administration for efficient and effective oil spill accident management and enhances oil spill accident early warning and alert mechanisms. The system will also enhance decision supports for quick emergency responses and improve real‐time communication and information sharing between responsible agencies.

This study explores the different survival strategies employed by family-owned small and medium-sized businesses in Nigeria. The study delves into the dynamics of ensuring business continuity from founders to successors and identifies the success factors that can facilitate seamless leadership transition outcomes.

This study utilised a qualitative multiple-case study approach, with the population consisting of founders from three medium-sized family businesses in Nigeria. Semi-structured interviews were the primary data collection tool used in the study. Furthermore, company documents were analysed to gain further insights into the leadership transition strategies employed in the selected businesses.

Successful transition and survival of family businesses are dependent on the founder's desire and support for transition, successor preparation, building trust and credibility in successors, and instilling a clear vision for the business.

The study's findings will provide valuable insights to leaders of family-owned SMEs, specifically in the development of effective leadership transition action plans. It should be noted that the study is limited to three family-owned businesses in two locations in Nigeria, which may restrict the generalisability of the findings. Despite this, the study offers novel contributions to the current literature by presenting practical strategies for achieving the survival of family businesses in an emerging economy.

This study proposed strategies for business survival, continuity, sustainability and seamless leadership transition for small and medium-sized family-owned businesses. Importantly, the study recommends action plans for present and prospective family business leaders to deepen succession pathways.

This paper argues that policymakers and academics should place more emphasis on maximising the additional benefit created by entrepreneurial support programs and impact investments. It demonstrates a robust approach to advancing this field of research by using qualitative methods to determine the variables that may predict the additional benefit a firm will gain from funding.

The research is based on 60 semi-structured interviews averaging 1.5 h each; 45 with entrepreneurs that did or did not receive funding from a business plan competition in Nigeria, 15 with relevant elites. Detailed World Bank panel data on program participants further validated responses and supported conclusions.

Numerous factors that may explain additional benefit were uncovered, including those that vary the need for external funding and those that vary access to it.

Qualitative methods explored variables previously assumed to be unobservable. Future studies are necessary to test the results quantitatively.

Understanding the characteristics that indicate ex ante which firms would most benefit from support will help policymakers, impact investors and development institutions to more effectively allocate capital.

This paper addresses the paucity of research into increasing additional impact and demonstrates the value of pursuing it. Methods used to suggest additionality variables for such programs and many of the factors highlighted are unique to this study. The research is also based on unique access to the participants and un-anonymised data from a significant World Bank study, and on substantially more interviews than previous papers.

This paper aims to investigate the aerodynamic characteristics as well as static stability of wing-in-ground effect aircraft. The effect of geometrical characteristics, namely, twist angle, dihedral angle, sweep angle and taper ratio are examined.

A three-dimensional computational fluid dynamic code is developed to investigate the aerodynamic characteristics of the effect. The turbulent model is utilized for characterization of flow over wing surface.

The numerical results show that the maximum change of the drag coefficient depends on the angle of attack, twist angle and ground clearance, in a decreasing order. Also, it is found that the lift coefficient increases as the ground clearance, twist angle and dihedral angle decrease. On the other hand, the sweep angle does not have a significant effect on the lift coefficient for the considered wing section and Reynolds number. Also, as the aerodynamic characteristics increase, the taper ratio befits in trailing state.

To design an aircraft, the effect of each design parameter needs to be estimated. For this purpose, the sensitivity analysis is used. In this paper, the influence of all parameter against each other including ground clearance, angle of attack, twist angle, dihedral angle and sweep angle for the NACA 6409 are investigated.

As a summary, the contribution of this paper is to predict the aerodynamic performance for the cruise condition. In this study, the sensitivity of the design parameter on aerodynamic performance can be estimated and the effect of geometrical characteristics has been investigated in detail. Also, the best lift to drag coefficient for the NACA 6409 wing section specifies and two types of taper ratios in ground effect are compared.

This study aims to investigate external auditors’ whistleblowing intentions by applying the moderated multicomponent of the theory of planned behaviour (TPB), incorporating perceived organizational support (POS) and provides insights on the moderating effect of moral norm on the relationship between attitude and internal whistleblowing intentions.

Data was gathered using a questionnaire survey involving 274 external auditors in Malaysia and the data was analyzed using SmartPLS 3.2.9.

The results show that there are positive relationships between perceived behavioural control and POS with whistleblowing intentions, but there is no evidence to support the hypotheses related to attitude and subjective norm. The findings provide partial support for the capability of the multicomponent model of TPB in examining whistleblowing intentions. The results further show that moral norm moderates the relationship between attitude and whistleblowing intentions.

The findings can assist accounting professional bodies and policy makers in formulating strategies to enhance the practice and, consequently, the benefits of whistleblowing. The findings are also valuable to managers of audit firms in strategizing for ways to enhance whistleblowing intentions to encourage the audit staffs to report any wrongdoings done by their colleagues.

This study provides the perspective of whistleblowing intentions of external auditors in the institutional setting of an emerging market, Malaysia. Further, this study extends the TPB model in whistleblowing studies by applying a higher-order construct, incorporating POS as an additional determinant of whistleblowing intentions and considering moral norm as moderating the relationship between attitude and whistleblowing intentions.

The aim of this study is to investigate the impact of integration capabilities on reverse supply chain (RSC) adoption and, consequently, RSCs' effectiveness. Thus, supply chain (SC) integration capabilities and their types in relation to internal, supplier and customer integration capabilities are investigated.

In this paper a quantitative survey was conducted with Malaysian manufacturers with a certified the International Organization for Standardization (ISO) 14001 environmental management system. The entire population was utilized through census sampling; 150 useable survey responses were received. The partial least squares technique was used for the data analysis.

The results indicate that internal integration improves external integration. In addition, supplier and customer integration have a positive direct effect on the adoption of RSC activities. Though internal integration has no significant direct effect on the adoption of RSC activities, it has an indirect impact through both supplier integrative capabilities and customer integrative capabilities.

The findings of this study suggest that the managers of manufacturers whose internal integrative capabilities are the base and whose SC integrative capabilities and external integrative capabilities are reinforcing SC integrative capabilities should adopt RSC activities.

The paper offers in-depth insight into this issue and has shed light on the ambiguities in the literature regarding the role of SC integration in RSC adoption.

This paper aims to analyze online repatronage intention (ORI) in the context of after-sales service (ASS) and assortment satisfaction (AS) for professional services. This study also aims to study the influence of ASS upon AS. Additionally, the role of social influence (SI) in influencing these two and other dependent variables is examined. Finally, the effect of moderation on these hypothesized relationships by four dichotomous variables is also investigated.

A structured questionnaire was used to collect data from 458 customers, who had a recent experience of ASS with their respective professional service providers, through purposive sampling method.

This empirical study establishes that ASS is an antecedent to AS and ORI. The finding of this empirical study also confirms that AS has a direct positive influence on ORI and customer loyalty. This implies that satisfied customers are more likely to repatronage the professional service and would be loyal to such professional service providers. The findings also reveal that all constructs are influenced by SI. Civil status, gender, city type (metro/non metro) and income status moderate a few of the hypothesized relationships, with city type having the maximum effect.

To the best of the author’s knowledge, this is the first study on online purchase of professional services which proves that ASS influences AS. Given the growth of online professional services, this study provides scholars and practitioners with suggestions and recommendations on how ASS and AS can be used to build ORI and a loyalty base. This study fills the void in extant literature by examining the interrelationships between ASS, assortment satisfaction, ORI and customer loyalty.