Samed Ayhan Özsoy, Safiye Meriç Acıkel and Cem Aydemir
The surface energy of the printing material can be increased to desired levels with different chemicals or methods. However, the important thing is that the surface properties of…
Abstract
Purpose
The surface energy of the printing material can be increased to desired levels with different chemicals or methods. However, the important thing is that the surface properties of printing material are not affected negatively. In this way the aim of this paper provide that the surface properties of matte and glossy coated paper is improved by the argon containing atmospheric pressure plasma device because the plasma treatment method does not occur surface damaging on the papers.
Design/methodology/approach
In experimental studies, test samples cut from 160 mm × 30 mm in size from 115 g/m2 gloss- and matt-coated papers were used. The plasma treatments of paper samples were carried out with an argon containing atmospheric pressure plasma device of laboratory scale that produces plasma of the corona discharge type at radio frequency. The optimized plasma parameters were at a frequency of 20 kHz and plasma power 200 W. A copper electrode of length 12 cm and diameter 2.5 mm was placed in the centre of the nozzle.
Findings
Research findings showed that the surface energies of the papers increased with the increase in plasma application time. While the contact angle of the untreated glossy paper is 82.2, 8 second plasma applied G3 sample showed 54 contact angle value. Similarly, the contact angle of the base paper of matt coated is 91.1, while M3 is reduced to 60.4 contact angles by the increasing plasma time.
Originality/value
Plasma treatment has shown that no chemical coating is needed to increase the wettability of the paper surface by reducing the contact angle between the paper and the water droplet. In addition, the surface energies of all papers treated by argon gas containing atmospheric pressure plasma, increased. Plasma treatment provides to improve both the wettability of the paper and the adhesion property required for the ink, with an environmentally friendly approach.
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Halit Firat Erdogan, Ayhan Kural and Can Ozsoy
The purpose of this paper is to design a controller for the unmanned aerial vehicle (UAV).
Abstract
Purpose
The purpose of this paper is to design a controller for the unmanned aerial vehicle (UAV).
Design/methodology/approach
In this study, the constrained multivariable multiple-input and multiple-output (MIMO) model predictive controller (MPC) has been designed to control all outputs by manipulating inputs. The aim of the autopilot of UAV is to keep the UAV around trim condition and to track airspeed commands.
Findings
The purpose of using this control method is to decrease the control effort under the certain constraints and deal with interactions between each output and input while tracking airspeed commands.
Originality/value
By using constraint, multivariable (four inputs and seven outputs) MPC unlike the relevant literature in this field, the UAV tracked airspeed commands with minimum control effort dealing with interactions between each input and output under disturbances such as wind.
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Gamze Koseoglu, S. Arzu Wasti and Hilal Terzi
In this chapter, the authors will examine turnover in Turkey. In the first section, the authors will briefly describe the legal, institutional, and cultural context with a…
Abstract
In this chapter, the authors will examine turnover in Turkey. In the first section, the authors will briefly describe the legal, institutional, and cultural context with a particular emphasis on their implications for employment conditions and turnover in Turkey. In the second section, the authors will review the academic literature on turnover that originated from Turkey. The authors divide the reviewed studies into two groups: generalizability studies, which are primarily replications of the mainstream literature with no focus on any specific characteristics of Turkey, and contextual studies, which emphasized the role of the economic, legal, or cultural background in formulating or interpreting their research. In the final section, the authors will discuss the findings of the review vis-á-vis the mainstream literature as well as practical implications and conclude with potential future research directions in the Turkish context.
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Celâl Ada and Ayhan Kural
The purpose of this paper is to present the autopilot design for the missile under various disturbances.
Abstract
Purpose
The purpose of this paper is to present the autopilot design for the missile under various disturbances.
Design/methodology/approach
In this study, model predictive control (MPC) method has been used for autopilot design for each axis. The aim of autopilot is that to keep the roll angle value around the zero degree and to track pitch/yaw acceleration commands. This three-axes control methodology also takes into consideration the interaction between pitch, yaw and roll motions.
Findings
The purpose of using MPC method for three-axes of the autopilot is to decrease the control effort and to make the close-loop system insensitive against modeling uncertainties and stochastic effects.
Originality/value
This study shows that the missile is able to reach to the desired target with good robustness, low control effort and little miss-distance under disturbances such as aerodynamic uncertainties, thrust misalignment and gust affect by using this alternative control method.