4D Printing Technology and Its Application Possibilities in Unmanned Aerial Vehicles (UAVs)

Ece Kalay | İskender Özkul

4D printing technology is an innovative manufacturing method that adds the dimension of time to traditional 3D printing, enabling materials to respond to environmental stimuli (such as temperature, humidity, light, etc.) by changing shape, properties, or functionality. This study examines the fundamental principles of 4D printing in detail and explores its advantages and potential applications in the context of Unmanned Aerial Vehicles (UAVs). The foundation of 4D printing lies in the use of smart materials such as shape-memory polymers, self-healing composites, and hydrogels. These materials allow UAV components to dynamically adapt to flight conditions through pre-programmed responses. The study also comparatively discusses 4D printing techniques (FDM, SLA, DIW, SLM) and their suitabilit...

The Determination of Financing Sources Affecting the Capital Budgets of Airline Companies

Korkmaz, Turhan | Turaboğlu, Tuncay Turan

This study aims to determine the impact of airline companies’ internal and external financing decisions on fixed asset investments. For this purpose, 25 airline companies worldwide were divided into two groups, with a market value greater than 10 billion dollars (BigCap) and below (SmallCap), and analyzed using the panel data method. External financing sources have a negative effect on fixed asset investments for BigCap airline companies, while external financing sources have a positive effect on SmallCap airline companies. Equity financing, return on assets, and net profit margin have statistically significant positive effects on fixed asset investments in SmallCap companies, while these effects are not statistically significant for BigCap companies.

Sermaye Yapısının İşletmeye Özgü Belirleyicileri: Türk İmalat Sanayi Alt Sektörleri Üzerine Bir Uygulama

Adil, Alpaslan | Karadeniz, Erdinç

Bu araştırmanın temel amacı, Türk imalat sanayi alt sektörlerinde sermaye yapısını belirleyen işletmeye özgü değişkenlerin etkilerini analiz etmektir. Bu kapsamda, Türkiye Cumhuriyet Merkez Bankası tarafından yayımlanan sektör bilançoları kullanılarak, imalat sektöründe faaliyet gösteren 22 alt sektörün 2009-2023 dönemine ait panel veri seti oluşturulmuştur. Elde edilen veriler doğrultusunda, panel eşbütünleşme ilişkilerinin varlığını test etmek amacıyla Durbin-Hausman panel eşbütünleşme testi uygulanmıştır. Ayrıca, değişkenler arasındaki nedensellik ilişkisini ortaya koymak amacıyla Emirmahmutoğlu ve Köse (2011) tarafından geliştirilen panel nedensellik testi tercih edilmiştir. Sermaye yapısını temsilen kaldıraç oranı bağımlı değişken olarak belirlenmiş; işletme büyüklüğü, kârlılık, sabit...

Türk Hastane Hizmetleri Sektöründe Yatırılan Sermayenin Getirisinin Analizi
ANALYSIS OF RETURN ON INVESTED CAPITAL IN TURKISH HOSPITAL SERVICES SECTOR

Karadeniz, Erdinç

Bu araştırmanın amacı Türk hastane hizmetleri sektöründe yatırılan sermayenin getirisinin hesaplanarak analiz edilmesidir. Bu amaçla Türkiye Cumhuriyet Merkez Bankası tarafından yayınlanan hastane hizmetleri sektör bilançoları ile Borsa İstanbul’da işlem gören dört adet şirketin 2018-2022 yıllarına ait finansal verileri üzerinden yatırılan sermaye, vergi sonrası net faaliyet karı ve yatırılan sermayenin getirisi hesaplanmıştır. Analiz sonucunda hastane hizmetleri sektöründe yatırılan sermaye ve vergi sonrası net faaliyet karı değerlerinin analiz döneminde pozitif olduğu ve yıllar itibariyle artış eğiliminde olduğu gözlemlenmiştir. Yine sektörün yatırılan sermayenin getirisi değerlerinin analiz döneminde standart değer olan %10’un üzerinde gerçekleştiği belirlenmiştir. Borsa İstanbul’da pay...

Bernoulli-Padovan polynomials and Pado-Bernoulli matrices

Dişkaya, Orhan | Menken, Hamza

In the present work we introduce Bernoulli-Padovan numbers and polynomials. We give their generating functions of the Bernoulli-Padovan numbers and polynomials. We establish various relations involving the Bernoulli-Padovan numbers and polynomials by considering the Pado-derivative. We describe Pado-Bernoulli matrices in terms of the Bernoulli-Padovan numbers and polynomials. We establish a factorisation of the Pado- Bernoulli matrix by using a generalised Pado-Pascal matrix, and obtain the inverse of the Pado-Bernoulli matrix. Also, we give a relationship between the Pado-Bernoulli matrix and the Pado-Pascal matrix.

ON THE BICOMPLEX PADOVAN AND BICOMPLEX PERRIN NUMBERS

Dişkaya, Orhan | Menken, Hamza

In this paper we first introduce the bicomplex Padovan and bicom- plex Perrin numbers which generalize Padovan and Perrin numbers, and then we derive the Binet-like formulas, the generating functions and the exponential gen- erating functions, series, sums of these sequences. Also, we obtain some binomial identities for them.

On the bivariate Padovan polynomials matrix

Dişkaya, Orhan | Menken, Hamza

In this paper, we intruduce the bivariate Padovan sequence we examine its various identities. We define the bivariate Padovan polynomials matrix. Then, we find the Binet formula, generating function and exponential generating function of the bivariate Padovan polynomials matrix. Also, we obtain a sum formula and its series representation.

On the Hyperbolic Leonardo and Hyperbolic Francois Quaternions

Dişkaya, Orhan | Menken, Hamza

In this paper, we present a new definition, referred to as the Francois sequence, related to the Lucas-like form of the Leonardo sequence. We also introduce the hyperbolic Leonardo and hyperbolic Francois quaternions. Afterward, we derive the Binet-like formulas and their generating functions. Moreover, we provide some binomial sums, Honsberger-like, d’Ocagne-like, Catalan-like, and Cassini-like identities of the hyperbolic Leonardo quaternions and hyperbolic Francois quaternions that allow an understanding of the quaternions’ proper- ties and their relation to the Francois sequence and Leonardo sequence. Finally, considering the results presented in this study, we discuss the need for further research in this field.

ON THE NOVEL GENERALIZATIONS OF THE PADOVAN SEQUENCE

Dişkaya, Orhan | Menken, Hamza

In the present work, we consider the Padovan sequence and define a sequence (called Quadrovan) that is a new generalization. In addition, we give the previously defined Tridovan sequence as a generalization of the Padovan sequence. We derive the Binet-like formulas, the generating functions and the exponential generating functions for the Tridovan and Quadrovan sequences. Also, we establish their series and matrices.

On the Quinary Fibonacci-Padovan Sequences

Dişkaya, Orhan | Menken, Hamza

In this paper, we consider the Fibonacci and Padovan sequences. We introduce the quinary Fibonacci-Padovan sequences whose compounds are the Fibonacci and Padovan sequences. We derive the Binet-like formulas, the generating functions and exponential generating functions of these sequences. Also, we obtain some binomial identities, series and sums for them.

ON THE PADOVAN ARRAYS

Dişkaya, Orhan | Menken, Hamza

In the present work, two new recurrences of the Padovan sequence given with delayed initial conditions are defined. Some identities of these sequences which we call the Padovan arrays were examined. Also, generating and series functions of the Padovan arrays are examined.

On the Richard and Raoul numbers

Dişkaya, Orhan | Menken, Hamza

In this study, we define and examine the Richard and Raoul sequences and we deal with, in detail, two special cases, namely, Richard and Raoul sequences. We indicate that there are close relations between Richard and Raoul numbers and Padovan and Perrin numbers. Moreover, we present the Binet-like formulas, generating functions, summation formulas, and some identities for these sequences.

On the Fibonacci quaternion sequence with quadruple-produce components

Dişkaya, Orhan | Menken, Hamza

This paper examines the Fibonacci quaternion sequence with quadruple-produce components, and demonstrates a golden-like ra- tio and some identities for this sequence. Its generating and exponential generating functions are given. Along with these, its series and binomial sum formula are established.

ZAMAN ETKENLİ FAALİYET TABANLI MALİYETLEME: TÜRKİYE’DEKİ AKADEMİK MAKALELERİN BİBLİYOGRAFİSİ (2007-2023)

Kurtlar, Murat.

Bu çalışmada, stratejik maliyetleme yaklaşımlarından zaman etkenli faaliyet tabanlı maliyetleme yaklaşımını konu alan Türkiye’deki akademik dergilerde 2007-2023 yılları arasında yayımlanmış makalelerin bibliyografisinin incelenmesi amaçlanmaktadır. Bu amaçla Google Akademik, Ulakbim, DergiPark ve diğer veri tabanlarından yararlanılarak 33 adet makale incelenmiştir. Çalışmanın sonucunda, ilgili dönemde incelenen makalelerin çoğunlukla 2017 ve 2019 yıllarında, yarısından fazlasının gerçek işletme verilerine göre yapılan ampirik çalışmalardan oluştuğu, erkek yazarlar tarafından ve iki yazarlı olarak yapıldığı tespit edilmiştir. Ayrıca konu ile ilgili makalelerin en fazla Muhasebe ve Vergi Uygulamaları, Muhasebe ve Finansman, Muhasebe Bilim Dünyası dergilerinde yayımlandığı, 30 farklı üniversi...

INVESTIGATION OF THE WEAR BEHAVIOR OF ALUMINUM ADDED BRAKE FRICTION COMPOSITES

Sugözü, Banu | Sugözü, İlker

New phosphine-amino-alcohol tridentate ligands for ruthenium catalyzed asymmetric transfer hydrogenation of ketones

Altan, Orhan | Yılmaz, Mustafa Kemal

New phosphine-amino-alcohol tridentate ligands (3a-c) and six new ruthenium complexes (4a-c and 5a-c) were synthesized and characterized. Catalytic activities of the metal complexes were tested on aryl alkyl ketones. All of the substrates were converted to related sec-alcohols in excellent yields (up to 99%), but enantioselectivities were insufficient (up to 40% ee). Despite the catalytic performance of 5a-c complexes can be considered as better than 4a-c, actually the catalytic activity of the complexes has been differed according to substrate. The ketones with less positive carbonyl carbons tend to give S-configuration with 5a-c and R-configuration with 4a-c. The catalytic performance of the complexes was rationalized by means of DFT calculations.