Scopus İndeksli Yayınlar Koleksiyonu / Scopus Indexed Publications Collections

Permanent URI for this collectionhttps://hdl.handle.net/20.500.13091/3

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Citation - Scopus: 1
2,4,6-Tris(p Synthesis and Electron Paramagnetic Resonance (epr) Analysis
(Sakarya University, 2022) Karataş, Ö.; Ceylan, Y.; Koç, Z.E.
A significant group of compounds arise from substituted s-triazine derivatives that have tripodal heterocyclic compound. Compounds classified as heterocyclic possible created the largest and most diverse family of organic compounds. In this study, we reported that a new template has been syntheses from a cyanuric chloride and its diamine derivative. The desired triamine a tripodal 2, 4, 6-tris (p-aminoaanilino)-1, 3, 5-triazine (C21H21N9), called to be TRIPOD, has been obtained from cyanuric chloride with 3 eq of p-phenylenediamine reaction in acetone. After synthesis, TRIPOD sample which was polycrystal form was irradiated by cobalt-gamma source. The electron paramagnetic resonance spectra of TRIPOD were recorded using X-band EPR spectrometer at room temperature in three axes (x, y, z) which are perpendicular at 10o intervals. The EPR spectrum was simulated using computer program and by using the spectrum. The radical structure was determined in the sample. © 2022, Sakarya University. All rights reserved.
Citation - Scopus: 5
Achieving Shojinka by Integrated Balancing of Multiple Straight Lines With Resource Dependent Task Times
(Springer New York LLC, 2019) Atasagun, Y.; Kara, Y.; Can Atasagun, Gözde
The concept of Shojinka, which is an important element of Just in Time production system, is attaining flexibility on the number of workers in a workshop due to demand variations. Even though Just in Time production system adopts U-shaped line layout, traditional straight lines can be combined and balanced in an integrated manner to obtain the advantages of Shojinka. In this case, the problem, which is called Integrated Balancing of Multiple Straight Lines, arises. On the other hand, the basic assumption of assembly line balancing is that every task’s time is fixed. However, in practice, different resource alternatives such as equipment or assistant worker may be available to process a task with different times. The problem in this case is to assign tasks and resources to stations that minimise total cost. In this study, a binary integer mathematical model is presented for integrated balancing of multiple straight lines, assuming that task times are resource dependent. The proposed model is illustrated and validated using several examples. An experimental analysis is also conducted to emphasize the advantages of the integrated balancing concept, compared to the situation in which the lines are balanced independent from each other. The experimental results show that, when multiple straight assembly lines are balanced in an integrated manner with resource dependent task times, an average total cost improvement of 23.105% can be obtained compared to the independent balances of the lines. This is a significant improvement that emphasizes the importance of balancing multiple straight lines in an integrated manner, to take the advantages of shojinka and to adhere to the main philosophy of Just in Time. © Springer Nature Switzerland AG 2019.
Air Quality of Karaman City, Turkey
(Hysen MANKOLLI, 2020) Mankolli, H.; Toros, H.; Dursun, S.
Karaman is a new and developing city in Turkey's economy is developing and the industry. Geographically, the location of Karaman is located in the south of the Central Anatolia region, in the north of the Taurus Mountains. With its fertile lands, the economy and industry based on Karaman agriculture are developing. Karaman city center has modern industrial facilities open for employment. It is known to have an important industrial potential in recent years. The total surface area of 887 thousand ha of Karaman province; 229 thousand hectares (26%) are flat areas and 654 thousand hectares (74%) are mountainous. The population size is around 250 thousand. Turkey is ahead in the production of bakery products, 35% and 20% of total wheat production is produced by Karaman biscuit manufacturing industry. Turkey, as in general in Karaman in fossil fuel consumption for heating in the cold winter air pollution as it is used in many developed cities is also observed. Traffic vehicles vehicle exhausts and fossil fuels used in industry are other important sources of pollution in the city center. In Turkey, the year 2020 at the beginning of March with the gorilla-19 Covidien epidemic, there has been a significant improvement in air quality. The field dust event that occurred after pandemic virus measures, especially PM pollution increase was observed. © 2020, Hysen MANKOLLI. All rights reserved.
Citation - Scopus: 4
An Analysis and Countermeasures of Fatal Accidents Caused by Firedamp Explosions in Underground Coal Mines in Turkey
(2019) Dursun, Arif Emre
Fatal accidents in underground coal mines in Turkey are common and experienced frequently. The major accident categories for underground coal mining in Turkey are gas related accidents (firedamp and outbursts), roof falls, flooding, fire and transport. In recent years, coal mine gas related accidents in Turkey, which are usually caused by firedamp and outbursts, are still threatening miners’ lives. Firedamp explosions are majorly serious mine accidents that can occur quickly and cause great deal damage. In this study, work-related accidents caused by firedamp and another gas accidents in Turkey between the years 2010-2016 were analyzed. As a result of these analyses, the number of deaths in underground coal mines in the past 7 years is 550 and the fatality rate is found to be 96.86%. The percentage of gases as the cause of the deaths is 70.18%. In this study, countermeasures are proposed that can prevent and control firedamp explosions and other gas related accidents.
Analysis of Factors Affecting Travel Costs in Beyşehir Lake National Park
(Tekirdag Namik Kemal University, 2022) Karakayacı, Zuhal; Karakayacı, Özer; Polat, Ahmet
Milli parklar sahip olduğu doğal, kültürel ve tarihi değerlerle rekreasyonel ve turizm amaçlı olarak değerlendirilmektedir. Türkiye’nin ikinci büyük milli parkı olan Beyşehir Gölü Milli Parkı da farklı zenginliklerle birçok insanın ziyaret ettiği yerlerden biridir. Milli parklar rekreasyon ve turizm amacıyla kullanıldığında, kullanıcılara bir maliyet getirmektedir. Seyahat, bir rekreasyonel faaliyet için tamamlayıcı bir nitelik taşımaktadır, çünkü bu faaliyetin gerçekleşebilmesi için söz konusu alana seyahat etmek gerekmektedir. Bu kapsamda, çalışmada Beyşehir Gölü Milli Parkı’nın seyahat maliyeti ve buna etki eden faktörleri incelenmiştir. Beyşehir Gölü Milli Parkı içinde bulunan çeşitli rekreasyon yerleri için ortalama seyahat maliyeti 252.97 TL, kişi başına düşen seyahat maliyeti 74.93 TL olarak hesaplanmıştır. Seyahat maliyetini etkileyen faktörleri incelemek için ziyaretçilerin seyahat maliyetleri yarı logaritmik regresyon modeliyle analiz edilmiştir. Bağımlı değişken seyahat süresince yapılan harcamaların toplamından oluşmakta, seyahat maliyetini etkileyen faktörler olarak, yaş, eğitim, medeni durum, gelir, geliş sıklığı, geliş amacı, geliş mesafesi gibi değişkenler alınmıştır. Analizlerde kullanılan; gelir, eğitim durumu, medeni durumun ‘’evli’’ olması, parka bir defadan fazla gelmiş olma, parka gelinen mesafe, parkı ziyaretin esas amaç olması ve parkta geçirilen zaman faktörleri ile seyahat maliyeti arasında pozitif bir ilişki bulunmaktadır. Yaş, parka geliş sıklığı ve parka şahsi araçla ulaşım sağlamış olma faktörleriyle seyahat maliyeti arasında ise negatif bir ilişki tespit edilmiştir. Seyahat maliyeti analizlerinde bu faktörlerin ele alınması rekreasyon amacıyla kullanılan alanların ekonomik anlamda değerlendirilmesinde yarar sağlayacaktır. Bir ülkenin önemli doğal kaynağı olan milli parkların ekonomik olarak ta değerlendirilerek milli gelire katkı sağlaması gerçekleştirilmelidir. Bu amaçla, milli parkları turizm faaliyetleri açısından sürdürülebilir hale getirecek çalışmalar doğayı koruyarak yapılmalıdır. Bu çalışmada tespit edilen seyahat maliyetini etkileyen faktörler de dikkate alınarak ilgili birimler tarafından programlar planlanmalıdır.
Analytical Study of the Radioactivity of Some Asphalt Springs in the Heet City, Anbar Governorate, Iraq
(Academic Science Publications and Distributions, 2025) Mahmood, B.A.; Faris, S.S.; Albayati, A.T.; Abdulkareem, N.T.; Eyada, S.O.; Abed, Q.N.
This research aims to estimate pollution levels of the concentrations of238U,232Th, and40K in the soil, water, and asphalt for some Heet City in the west of Anbar Governorate-Iraq to find out the natural and industrial radioactivity contaminations. In this study, the gamma-ray spectroscopy technique was used with a Germanium detector to calculate the levels of radioactivity of natural radionuclides (238U,232Th,40K) in different samples of soil, water, and asphalt collected from (8) areas of Heet City and its nearby regions in Anbar Governorate-Iraq. Through the study results, it was shown that the range of concentration values for238U,232Th, and40k in soil samples ranged from (1.2, 2, and 26) Bq/kg to (810, 506.6, and 435.7) Bq/kg and at an average (147.2, 94,1, and 309.28), respectively. While in asphalt samples, the concentrations ranged between (17 and 48) Bq/kg for both238U and232Th, and for40k, they ranged between (220 and 326) Bq/kg. As for water samples, the study did not detect any concentrations of238U and232Th, and the detected concentrations of40k were very low. In general, from this study, we conclude that the Abu Al-Jeer region contains relatively high radioactivity levels, higher than the permissible global limit in some of its areas. Therefore, periodic and continuous monitoring must be conducted to verify radioactivity in these areas to avoid any potential danger to the population. © 2025, Academic Science Publications and Distributions. All rights reserved.
Citation - Scopus: 3
Anti-Colorectal Cancer Effects of Medicinal Plants: Euphorbia Helioscopia, Ferula Elaeochytris, and Sideritis Albiflora
(2021) Deveci, Ebru; Çayan, Gülsen Tel; Karakurt, Serdar; Duru, Mehmet Emin
Phytochemicals, extracts, and mixtures obtained from plants have been offered as an option for cancer treatment and prevention for modern drug discovery in recent years. For this purpose, in this study, anti-colorectal cancer effects of the hexane, acetone, methanol, and water extracts obtained by sequential extraction from Euphorbia helioscopia L., Ferula elaeochytris Korovin, and Sideritis albiflora Hub.-Mor. on DLD-1 cell line were investigated in vitro by using Alamar blue assay. Dosedependent inhibition was detected in the viability of DLD-1 cell line. In all three plants species, E. helioscopia (IC50: 140.83±0.31 µg/mL), F. elaeochytris (IC50: 67.93±0.12 µg/mL), and S. albiflora (IC50: 85.12±0.10 µg/mL) methanol extracts showed higher anti-colorectal effects on DLD-1 cell line compared to other extracts tested for the same species. In addition, the IC50 value of doxorubicin used as a standard was found as 6.10±0.55 µg/mL. With the results obtained, as the first report highlighting in vitro anti-colorectal cancer effects of the studied plant species on DLD-1 cell line, promising marks were obtained from the analysis of the extracts as anti-cancer sources for plant-derived drug applications.
Citation - Scopus: 11
Antioxidant, Cytotoxic, and Enzyme Inhibitory Activities of Agropyron Repens and Crataegus Monogyna Species
(2020) Deveci, Ebru; Çayan, Gülşen Tel; Karakurt, Serdar; Duru, Mehmet Emin
Objective: The aim of this study was to investigate antioxidant, enzyme inhibitory and cytotoxic activities of Agropyron repens and Crataegus monogyna methanol extracts with total phenolic and flavonoid contents. Materials and Methods: Total phenolic and flavonoid contents of A. repens and C. monogyna methanol extracts were measured according to Folin Ciocalteu and aluminum nitrate methods, respectively. Antioxidant and enzyme inhibitory activities of the methanol extracts were tested spectrophotometrically. Also, cytotoxic activities of the methanol extracts against DLD-1 and CCD-18Co were investigated by using Alamar Blue assay. Results: C. monogyna methanol extract with the highest total phenolic and flavonoid contents (68.13±0.34 µg GAEs/mg extract and 36.91±0.17 µg QEs/mg extract, respectively) had the best antioxidant activity in ?-carotene-linoleic acid ($IC_50$: 32.72±0.15 µg/mL), CUPRAC ($A_0.50$: 282.69±0.25 µg/mL), DPPH• ($IC_50$: 71.69±0.85 µg/mL), and ABTS•+ ($IC_50$: 40.43±0.55 µg/ mL) assays. A. repens methanol extract showed the highest effect against AChE (18.73±0.47 %), BChE (37.59±1.07 %), urease (89.18±0.84%), ?-glucosidase (6.71±0.23 %), whereas C. monogyna methanol extract showed the highest effect against tyrosinase (30.52±1.00%) and ?-amylase (37.24±0.06 %). Also, A. repens ($IC_50$: 57.38 µg/mL) and C. monogyna ($IC_50$: 54.04 µg/ mL) methanol extracts showed close cytotoxic activity on DLD-1. Conclusion: Antioxidant, cytotoxic, and enzyme inhibitory activities of A. repens and C. monogyna methanol extracts were investigated with total phenolic and flavonoid contents in this study. The results obtained with this study strengthen the potential of the studied plants as a new source for the discovery of antioxidant, cytotoxic, and enzyme inhibitor agents.
An Application for Selecting and Evaluating Organization Based Kpis With Fuzzy Mcdm in a Large-Scale Organization Operating in the It Sector
(Springer Science and Business Media Deutschland GmbH, 2023) Yel, İ.; Baysal, M.E.; Sarucan, A.
In today's world, where many people use the outputs of the Information Technologies (IT) industry, it has become a problem for large-scale organizations to compare their IT departments objectively. The use of fuzzy MCDM methods for such a multidimensional problem is evaluated within the scope of this study. As a first step, twenty KPIs were determined by literature review and expert opinion to evaluate organizational units. Subsequently, KPI selection criteria were defined based on the opinions of ten expert personnel working in Architecht Information Systems for the selection of the most appropriate KPIs. These criteria are weighted by the fuzzy AHP method. Eight of the KPIs over the Neutrosophic Z Number (NZN) sets were selected for comparison by the same experts. Four different organizations were ranked by scoring over eight KPIs. It has been confirmed that the results of objective evaluations, instead of subjective evaluations, are more embraced by employees and managers, according to the outputs of the common sense and the infrastructural suitability of the institution. © 2023, The Author(s), under exclusive license to Springer Nature Switzerland AG.
Application of an Artificial Neural Network for Predicting Compressive and Flexural Strength of Basalt Fiber Added Lightweight
(Tulpar Academic Publishing, 2021) Calis, G.; Yıldızel, S.A.; Keskin, U. S.
Concrete is known as one of the fundamental materials in construction with its high amount of use. Lightweight concrete (LWC) can be a good alternative in reducing the environmental effect of concrete by decreasing the self-weight and dimensions of the structure. In order to reduce self-weight of concrete artificial aggregates, some of which are produced from waste materials, are utilized, and it also contributes to de-velop a sustainable material Artificial neural networks have been the focus of many scholars for long time with the purpose of analyzing and predicting the lightweight concrete compressive and flexural strengths. The artificial neural network is more powerful method in terms of providing explanation and prediction in engineering studies. It is proved that the error rate of ANN is smaller than regression method. Furthermore, ANN has superior performance over nonlinear regression model. In this paper, an ANN based system is proposed in order to provide a better understand-ing of basalt fiber reinforced lightweight concrete. In the regression analysis pre-dicted vs. experimental flexural strength, R-sqr is determined to be 86%. The most important strength contributing factors were analyzed within the scope of this study. © 2021, Tulpar Academic Publishing. All rights reserved.
Citation - Scopus: 4
An Application of Fuzzy Ahp, Edas and Waspas for the Selection of Process Method in Software Projects
(Springer Science and Business Media Deutschland GmbH, 2022) Yel, İ.; Sarucan, Ahmet; Baysal, M.E.
In software development projects, the complexity of the tasks to be completed and the fact that the resources are real people, unlike in the manufacturing sector, are important factors that pose challenges to project management. In addition, operational reasons such as time-dependent changes in software requirements also complicate the management of projects. During the execution of the projects, in addition to the internal dynamics of the project, the organizational characteristics of the participants and the competencies of the team also influence the success of the project. In this context, various software development process methodologies are used for change management, including “Agile and Waterfall Methods”. The aim is to select projects based on technical and managerial criteria by considering the skills of the development teams that actively participate in the project. In the study, the weights of the criteria are determined using fuzzy AHP. Then, Fuzzy EDAS and WASPAS methods are used for ranking the projects and the information technology teams. The statistical information about the errors after software development was obtained as a result of the process management decision made. © 2022, The Author(s), under exclusive license to Springer Nature Switzerland AG.
Citation - Scopus: 1
Application of Magnetic Biochar@alginate Composite as Adsorbent for Effective Removal of Methylene Blue From Aqueous Media
(ISRES Publishing, 2024) Parlayici, S.; Pehlivan, E.
In recent years, magnetic biochar has been widely used for the removal of dyes in polluted water due to its magnetic separation abilities and has been used as composite adsorbents by incorporating different biomasses into its structure for the removal of such pollutants. In this study, a new composite magnetic biochar@alginate composite (mBC@Alg) was synthesized as an alternative adsorbent for the removal of methylene blue (MB) from aqueous solutions. The primary focus of this intensive preparation procedure is on the synthesis, characterization, and optimization of the mBC@Alg for enhanced MB adsorption capacity. The composite material was characterized using FT-IR analysis and scanning electron microscopy (SEM). Batch adsorption studies experiments were performed to determine the removal efficiencies, pH, adsorbent dose, contact time and initial concentration of MB molecules. Various adsorption isotherms such as Freundlich, Langmuir, Scathard and Dubinin-Radushkevich were used to describe the adsorption behavior at equilibrium. The Langmuir adsorption isotherm was identified as the most appropriate model to explain the observed adsorption phenomena, and the adsorption capacity of mBC@Alg for MB was determined to be 416.67 mg/g using this isotherm. Kinetic studies were carried out using pseudo-first-order and pseudo-second-order kinetic models and it was concluded that the experimental data fit well with the second-order kinetic model. The adsorbent properties of the mBC@Alg composite are particularly effective in removing MB molecules from aqueous solutions. © 2024 Published by ISRES.
An Application With Fuzzy Ahp for Making the Assignment Aimed at the Holistic Benefit Over the Person Evaluation as Required by the Requirements and Evaluations of Individuals
(Springer Science and Business Media Deutschland GmbH, 2023) Yel, İ.; Şahin, H.; Baysal, M.E.; Sarucan, A.
It is assumed that the success rates of information technology (IT) projects will increase with the management of development packages called Most Valuable Product (MVP). This is considered to be a real requirement. Based on this assumption, this study identified different criteria based on the requirements or MVPs to be developed in an organization. The criteria are differentiated for analyst and software developer positions. The level of each criterion was defined by the experts for the development of MVPs. The same criteria were used to evaluate both analyst and software developer positions. After evaluating the MVPs and determining the levels of the individuals, the weights of the criteria were determined using fuzzy AHP to determine the desired level and the levels of the individuals. The minimization problem of which person should be assigned to which MVP package over the weights was solved using the Excel solver. The sums were performed. The result is a balanced distribution of multiple MVP packages within a unit; with the goal of assigning MVP packages to the positions that can best improve themselves and increase overall benefit. Evaluation of employee competencies and needs definitions of projects with fuzzy MCDM method constitutes an important contribution of this study. Under the guidance of the evaluations, erroneous assignments that would lead the project to failure were avoided and more competent people were appointed for more critical requirements. Thus, the potentials of competent persons were utilized at the highest level. © 2023, The Author(s), under exclusive license to Springer Nature Switzerland AG.
Assessment of Work Accidents in Highway, Street and Bridge Construction
(International Multidisciplinary Scientific Geoconference, 2018) Bilim, Atiye; Çelik, Osman Nuri
Occupational health and safety is an important work discipline that must be included in the working life. Especially, developed countries have been able to place this discipline in working life, while developing countries have still problems. These problems take place both in terms of legislation and practice. The situation is similar to that of developing countries, in Turkey. The construction sector is in line with the development status of a country. The construction sector contributes both directly and indirectly to the country's economy. It has become indispensable for the economy of a country with its share in employment and it stimulates production of goods and services related to the sector. The construction sector is not just about building constructions. We also need bridges, metros and high-speed train lines. Transports have a major contributor to the development of a country. In parallel with technological developments, large investments related with transports become increase. Due to the revival in this sub-sector, the number of work accidents has also tended to increase. Therefore, the work accidents in the highway, street and bridge constructions, which are the sub-activities of the construction sector, must be examined. In this study, work accidents in the sector were analyzed for Turkey and U.S. Also, the share of the sector in total work accidents and construction accidents were determined for Turkey and U.S. The causes of fatal work accidents in highway, street and bridge constructions were mentioned. © 2018, International Multidisciplinary Scientific Geoconference. All rights reserved.
Autogenous Self-Healing Assessment of 1-Year Cementitious Composites
(Springer Science and Business Media B.V., 2021) Yildirim, Gurkan; Ulugol, Huseyin; Ozturk, Oguzhan; Sahmaran, Mustafa
Traditional concrete materials are prone to cracking and as cracks form, durability issues arise which reduce the expected service life of the materials followed by structures incorporating them. This, in many occasions, may lead to repetitive repair and maintenance or even re-construction of certain structural/non-structural sections and structures. Thus, it is highly desirable to reduce the chance and/or further development of cracking. Engineered Cementitious Composites (ECC) are feasible materials to suppress cracking formation and progression through their strain-hardening response under uniaxial tensile loading conditions. Even at the stage of failure, these materials exhibit micron-size cracks which significantly improve the capability to resist against detrimental durability issues. Moreover, these microcracks are constantly reported to be closed through autogenous healing mechanisms with no external interference from outside which significantly improve the mechanical and durability performance and service life of these materials and structures incorporating them. However, the performance of autogenous self-healing in ECC is called into question, especially for late-age specimens since reactions which produce products to plug the micro-size cracks stabilize as the specimens get more and more mature. To clarify this subject, in this study, 1-year-old specimens produced from ECC mixtures incorporated with different mineral admixtures (i.e. Class-F fly ash and ground granulated blast furnace slag) were tested for their self-healing performance. For self-healing evaluation, specimens which were severely preloaded for creating microcracks, were subjected to four different curing conditions which included "Water", "Air", "CO2-water" and "CO2-air" for 90 additional days beyond initial 1 year. Tests used for self-healing assessments were electrical impedance (EI) and rapid chloride permeability (RCP). Results indicate that water is a must-have component for enhanced autogenous self-healing efficiency. "CO2-Water" curing results in the most effective self-healing performance regardless of the composition of ECC mixtures. By properly adjusting mixture proportions and curing conditions, microcracks as large as nearly half a millimeter (458 mu m) can be healed in only 30 days of further curing. Overall, results clearly suggest that late-age autogenous self-healing capability of ECC can be made as effective as the early-age with proper further environmental conditioning and mixture design.
Citation - Scopus: 1
Automatic Control of Recirculation System for Respiratory Control
(Springer International Publishing Ag, 2023) Jovanovic, Milos; Dihovicni, Djordje; Aksoy, Muharrem Hilmi
The issue of providing fresh air and technologies for its maintenance within physiologically acceptable references represents an active field of innovative engineering in the field of medicine, industry, army, space program, sports and lately and everyday life of people in cities. The problem-solving approach is generally divided into the construction of personal devices, for living in environments with reduced oxygen concentration and/or increased concentration of harmful elements that would lead to disruption of vital functions and system solutions for air recovery and ventilation in closed indoor units. Although 400 years have passed since the first technical concept, this area is still a challenge to optimize systems and devices and enable people to realize their activities in all potentially and real risk areas, in terms of maintaining respiratory function and metabolism without negative effects and increased efforts as close as possible to the stay in the natural environment for which man is prepared with his biological apparel.
Citation - Scopus: 1
Automatic Sleep Stage Classification for the Obstructive Sleep Apnea
(Trans Tech Publications Ltd, 2023) Özsen, Seral; Koca, Yasin; Tezel, Gülay Tezel; Solak, Fatma Zehra; Vatansev, Hulya; Kucukturk, Serkan
Automatic sleep scoring systems have been much more attention in the last decades. Whereas a wide variety of studies have been used in this subject area, the accuracies are still under acceptable limits to apply these methods to real-life data. One can find many high-accuracy studies in literature using a standard database but when it comes to using real data reaching such high performance is not straightforward. In this study, five distinct datasets were prepared using 124 persons including 93 unhealthy and 31 healthy persons. These datasets consist of time-, nonlinear-, welch-, discrete wavelet transform- and Hilbert-Huang transform features. By applying k-NN, Decision Trees, ANN, SVM, and Bagged Tree classifiers to these feature sets in various manners by using feature-selection highest classification accuracy was searched. The maximum classification accuracy was detected in the case of the Bagged Tree classifier as 95.06% with the use of 14 features among a total of 136 features. This accuracy is relatively high compared with the literature for a real-data application.
Availability Analysis of Gnss Orbit and Clock Files
(TUBITAK, 2023) Öğütcü, S.; Alçay, S.; Özdemir, B.N.; Konukseven, C.; Atiz, Ö.F.
Precise point positioning with Global Navigation Satellite Systems (GNSS), orbit and clock products are mandatory. Today, different analysis centers produce satellite orbit and clock products. At the same time, the latency of these products is divided into three different categories. In this study, the satellite availability analysis of the publicly available final, rapid and ultra-rapid orbit (sp3) and clock files were investigated for Global Positioning System (GPS), Globalnaya Navigatsionnaya Sputnikovaya Sistema (GLONASS), European Global Navigation Satellite System (Galileo), BeiDou Navigation Satellite System (Beidou-2, BeiDou-3) and Quasi-Zenith Satellite System (QZSS) satellites within a one-year period of 2021. In addition, clock biases that do not exist in orbit files have also been calculated for each system. The results show that average number of GPS and GLONASS satellites are consistent among the products, however, the average GALILEO and BeiDou satellites are significantly changing among the products. The minimum average number of Galileo satellites was calculated for the final, rapid and ultra-rapid orbit products for the Centre national d'études spatiales (CNES (final)), German Research Centre for Geosciences (GFZ (rapid)) and GFZ (ultra) analysis centers, respectively. The minimum average number of satellites for BeiDou-3 medium earth orbit (MEO) and QZSS was calculated for the CODE analysis center. © 2023, TUBITAK. All rights reserved.
Citation - Scopus: 2
Bibliometric Analysis of 3d Printing Technology in the Field of Architecture: an Education Review
(Common Ground Research Networks, 2024) Qurraie, B.S.; Top, S.M.; Özeren, E.B.; Özeren, Ö.
With the ease of access to 3D printers, innovative studies are carried out daily to bring new perspectives to the discipline of architecture and to produce new and creative ideas to solve existing problems. The primary purpose of this article is to explore the developments in architecture using 3D printing production by carrying out a bibliometric analysis of the 3D printer-related publications in the Web of Science database in the field of architecture. The publications between 2013 and 2023 were analyzed by keyword, author, countries, citation, affiliation, and source. VOSviewer and Biblioshiny software were used to display the results of the analysis graphically. Afterward, studies on the use of 3D printing in education were examined in detail. It was concluded that 3D printing has brought a new perspective and design flexibility to the field of architecture. However, the limitations of current technology and its potential impact on design processes remain a point of contentious discussion among students, academics, and practitioners. © 2024 Common Ground Research Networks. All rights reserved.
Citation - Scopus: 10
The Boriding Process for Enhancing the Surface Properties of High-Temperature Metallic Materials
(Springer Science and Business Media Deutschland GmbH, 2024) Campos, Silva, I.E.; Günen, A.; Serdar, Karakaş, M.; Delgado, Brito, A.M.
High-temperature metallic materials operate in environments with a broad spectrum of mechanical and chemical conditions, originating typical failures such as steam oxidation, hot corrosion, and wear-corrosion; the service life of the metallic component is reduced with severe economic losses. The ever-increasing demands for enhanced component performance require continuous improvements in existing material systems. In this sense, boriding is a promising thermochemical process used to increase the surface properties of metallic materials for high-temperature applications. The resulting boride coating has excellent wear resistance at high temperatures due to its high hardness, thermal, and chemical stability, and adhesion to the substrate material. In addition, the boride coating is resistant to corrosion in acidic, alkaline, and salt media, suitable for use in harsh environments. The mechanical and chemical properties of the boride coating are preserved at high temperatures (up to 1000 °C); the probability of the boride coating cracking or spalling at high temperature is negligible. This chapter reviews the various boriding methods as adopted for the formation of boride coating on high-temperature metallic materials to improve its performance for diverse high-temperature applications. Wear, practical adhesion, oxidation, corrosion, and tribocorrosion properties of borided materials are explained in terms of the boride coating-substrate system behavior. © The Author(s), under exclusive license to Springer Nature Switzerland AG 2024.

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