Mustafa Serdar Genç, Hacımurat Demir, Mustafa Özden and Tuna Murat Bodur
The purpose of this exhaustive experimental study is to investigate the fluid-structure interaction in the flexible membrane wings over a range of angles of attack for various…
Abstract
Purpose
The purpose of this exhaustive experimental study is to investigate the fluid-structure interaction in the flexible membrane wings over a range of angles of attack for various Reynolds numbers.
Design/methodology/approach
In this paper, an experimental study on fluid-structure interaction of flexible membrane wings was presented at Reynolds numbers of 2.5 × 104, 5 × 104 and 7.5 × 104. In the experimental studies, flow visualization, velocity and deformation measurements for flexible membrane wings were performed by the smoke-wire technique, multichannel constant temperature anemometer and digital image correlation system, respectively. All experimental results were combined and fluid-structure interaction was discussed.
Findings
In the flexible wings with the higher aspect ratio, higher vibration modes were noticed because the leading-edge separation was dominant at lower angles of attack. As both Reynolds number and the aspect ratio increased, the maximum membrane deformations increased and the vibrations became visible, secondary vibration modes were observed with growing the leading-edge vortices at moderate angles of attack. Moreover, in the graphs of the spectral analysis of the membrane displacement and the velocity; the dominant frequencies coincided because of the interaction of the flow over the wings and the membrane deformations.
Originality/value
Unlike available literature, obtained results were presented comparatively using the sketches of the smoke-wire photographs with deformation measurement or turbulence statistics from the velocity measurements. In this study, fluid-structure interaction and leading-edge vortices of membrane wings were investigated in detail with increasing both Reynolds number and the aspect ratio.
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Metin Reyhanoglu and Ozden Akin
This study aims to investigate the impact of toxic leadership, organizational justice and organizational silence on hospital employees' intention to leave their jobs.
Abstract
Purpose
This study aims to investigate the impact of toxic leadership, organizational justice and organizational silence on hospital employees' intention to leave their jobs.
Design/methodology/approach
A questionnaire survey was conducted with permanent and contractual employees of a university teaching hospital, including nurses, medical assistants, health technicians and clerical staff. Structural equation modeling was used to develop and test the model.
Findings
The findings reveal that toxic leadership is directly and negatively related to organizational justice, while all dimensions of organizational silence and the intention to leave are positively related. In this model, the coefficients of the relationships are found to be higher, almost doubling in permanent employees than in contracted employees, except for the relationship between toxic leadership and silence to protect the organization. This exception lies in the fact that permanent workers with long-term employment have been dealing with the managers for many years.
Research limitations/implications
The model can be extended with counterproductive behavior, work performance and satisfaction measures and work stress and compared with different sectors using higher sample volumes.
Originality/value
In the human-centered health-care industry, it is essential to know the way leadership behaviors guide health-care professionals. The negative leadership behaviors can negatively affect both employees' self-esteem and their attitudes toward patients and their relatives. The results of the present study are expected to contribute to the development of more effective manager selection and promotion policies by policy-makers as well as the determination of short- and long-term employment policies.
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Özden Melis Uluğ, Özen Odağ, J. Christopher Cohrs and Peter Holtz
Conflict understandings of lay people mirror society in miniature. Although lay people and their conflict understandings in society may shape the course of an ongoing conflict…
Abstract
Purpose
Conflict understandings of lay people mirror society in miniature. Although lay people and their conflict understandings in society may shape the course of an ongoing conflict, little scholarly attention is so far given to the understandings of everyday discourse in Turkey’s ongoing Kurdish conflict. The present research aims to examine the views of lay Kurds and Turks in two politically polarized cities in Turkey, Mersin and Diyarbakır.
Design/methodology/approach
To examine these views, the authors used focus group discussions and open-ended questionnaires with a total of 64 lay people from Mersin and Diyarbakır.
Findings
Qualitative content analysis revealed more conflict understandings than presented in the existing academic literature. Furthermore, multiple correspondence analysis suggested that both ethnic identity and the city in which people live are important factors influencing how people perceive the conflict.
Originality/value
The meaning of novel themes, differences and similarities within and between ethnic groups and two cities, and the usefulness of qualitative methods to examine lay people’s viewpoints are discussed.
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This paper aims to investigate the introduction of rationalist concepts through Taylorization to Turkey during the early republican era, using Wallace Clark’s case of the Turkish…
Abstract
Purpose
This paper aims to investigate the introduction of rationalist concepts through Taylorization to Turkey during the early republican era, using Wallace Clark’s case of the Turkish State Monopolies.
Design/methodology/approach
The study uses a historical narrative approach to explore the roles of foreign experts in the transfer of rationalist and Taylorist ideas to Turkish State Monopolies (Inhisarlar Idaresi).
Findings
This study illuminates the introduction and adoption of Taylorist principles in early republican Turkey through multiple lenses. First, it underscores the era’s fervent drive for rapid modernization, rooted in emulation of Western models perceived as progressive. Second, using a historical narrative approach, this research highlights the pivotal role of foreign expertise in catalyzing and formalizing rationalization efforts.
Originality/value
This study makes a unique and meaningful contribution to the history of management in terms of demonstrating the international influence of the Scientific Management Movement through the neglected case of Turkey.
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Ramazan Özkan and Mustafa Serdar Genç
Wind turbines are one of the best candidates to solve the problem of increasing energy demand in the world. The aim of this paper is to apply a multi-objective structural…
Abstract
Purpose
Wind turbines are one of the best candidates to solve the problem of increasing energy demand in the world. The aim of this paper is to apply a multi-objective structural optimization study to a Phase II wind turbine blade produced by the National Renewable Energy Laboratory to obtain a more efficient small-scale wind turbine.
Design/methodology/approach
To solve this structural optimization problem, a new Non-Dominated Sorting Genetic Algorithm (NSGA-II) was performed. In the optimization study, the objective function was on minimization of mass and cost of the blade, and design parameters were composite material type and spar cap layer number. Design constraints were deformation, strain, stress, natural frequency and failure criteria. ANSYS Composite PrepPost (ACP) module was used to model the composite materials of the blade. Moreover, fluid–structure interaction (FSI) model in ANSYS was used to carry out flow and structural analysis on the blade.
Findings
As a result, a new original blade was designed using the multi-objective structural optimization study which has been adapted for aerodynamic optimization, the NSGA-II algorithm and FSI. The mass of three selected optimized blades using carbon composite decreased as much as 6.6%, 11.9% and 14.3%, respectively, while their costs increased by 23.1%, 29.9% and 38.3%. This multi-objective structural optimization-based study indicates that the composite configuration of the blade could be altered to reach the desired weight and cost for production.
Originality/value
ACP module is a novel and advanced composite modeling technique. This study is a novel study to present the NSGA-II algorithm, which has been adapted for aerodynamic optimization, together with the FSI. Unlike other studies, complex composite layup, fiber directions and layer orientations were defined by using the ACP module, and the composite blade analyzed both aerodynamic pressure and structural design using ACP and FSI modules together.
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Australia is one of the “people scarce” countries which make efforts to invite skilled immigrants from more “people abundant” countries. The existence of legislation, as well as…
Abstract
Australia is one of the “people scarce” countries which make efforts to invite skilled immigrants from more “people abundant” countries. The existence of legislation, as well as organizational policies and mission statements on equity, nondiscrimination, and cultural diversity, does not mean that exclusionary practices do not take place both while hiring and after employment. With the increasing diversity in the work environment, Australian organizations need to make proper adjustments regarding worker's interests and needs, and to make sure the work environment is equitable and inclusive. A culture which encourages exclusion is likely to harm organizational outcomes including group effectiveness, motivation, and job satisfaction.
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The EU harmonisation has created changes in the military's formal and informal influence in the directions of decreased formal and informal military influence in civilian…
Abstract
The EU harmonisation has created changes in the military's formal and informal influence in the directions of decreased formal and informal military influence in civilian politics. The EU reforms have created changes in the mindset of the citizens, by creating changes in the security culture of the citizens and in the civil-military related political culture. The desired level of alignment has not been reached. Therefore, the study examines the areas where further alignment is required. Moving from Rebecca L. Schiff's concordance theory, the article examines the relationship between the Turkish military, the civilian politics and the society before and after the EU harmonisation process. It examines the effects of the EU harmonisation process on the changes in the civil-military balance of power, and on the related security culture and political values. The analysis focuses on: (i) increased civilian control and consequent changes in the policy of accountability; (ii) transparency building in the defence sector; (iii) parliamentary oversight; and (iv) the change in the political culture related to the civil-military issues. It also investigates the extent the EU harmonisation has achieved in building democratic civil-military relations in order to align with the EU standards.
Mustafa Çiçekler, Velican Üzüm and Emrullah Çopurkuyu
The purpose of this study is to investigate the effects of a pigment coating on the mechanical properties of fluting paper.
Abstract
Purpose
The purpose of this study is to investigate the effects of a pigment coating on the mechanical properties of fluting paper.
Design/methodology/approach
Two different calcium carbonate pigments were used in the preparation of the coated color, precipitated calcium carbonate (PCC) and ground calcium carbonate (GCC). Fluting paper produced by recycling waste paper was used as base paper. The effects of PCC and GCC pigments on mechanical properties were compared. Ring crush test (RCT), corrugating medium test (CMT), corrugating crush test (CCT), tensile and burst strength tests were applied to the coated papers, and the results were compared to the mechanical properties of base paper.
Findings
The tensile and burst indices of the coated papers were found to be higher than base papers about 13.9% and 6.05%, respectively. While the coating process positively affected the RCT and CCT values, it did not show a significant impact on the CMT values. GCC, one of the pigments used in coating colors, had a more effective effect on the mechanical properties of fluting papers compared to PCC.
Originality/value
These results suggest that coating of fluting papers has a positive effect on mechanical properties and the use of GCC as a pigment is more effective than PCC.