Ultra düşük oranlarda SWCNT ilaveli UHPC’lerin mekanik ve elektriksel özelliklerinin incelenmesi

With the development of nanotechnology, the use of nano materials with specific features in the construction industry, especially in the field of building materials, attracts attention by many researchers. According to the literature, carbon nanotubes (CNTs) are among the highly usable nanomaterials in the mixtures of cementitious materials. Although there are many studies on multi-walled carbon nanotube (MWCNT) added concretes, there are limited studies investigating the behavior of single-walled carbon nanotubes (SWCNTs) on concrete. In the present study, the mechanical and electrical properties of ultra-high performance concretes (UHPCs) produced by using SWCNT at the ratios of 0.0125, 0.020 and 0.025 % of cement weight were investigated. By adding 4.2 % steel fiber to the same mixtures, a total of 8 mixes with the reference were obtained. Conductivity and bending tests were carried out on 12X3X2 cm specimens. For electrical resistance measurement, the two-point uniaxial method, which is common in measuring cementitious materials, was used. According to the results, positive effects of SWCNT on mechanical properties have been observed. With the addition of SWCNT and increasing its ratio, the electrical resistance decreased, but it was found that high rates of SWCNT were required to increase the current rate. In addition, the effect of SWCNT was more pronounced in steel fiber added mixtures

Sustainability in manufacturing: Future trends

Climate change is perhaps one of the biggest crises affecting our world nowadays. Therefore, the conscious use and protection of resources by humans are extremely important. The term sustainability is often used to denote activities, initiatives, and actions aimed at protecting a particular resource. Sustainability deals with four different areas, i.e., human, social, economic, and environmental. Sustainable manufacturing is an economic process that reduces the damage to world impact while protecting our natural resources. Ecological cooling/lubrication used in sustainable manufacturing is the future trend. Throughout this chapter, research on ecological cooling/lubrication methods was discussed. Moreover, various studies and their results are reported. In recent years, studies in the literature have focused on alternative ecological cooling/lubrication methods that minimize or eliminate petroleum-based cutting fluids used in metal-cutting processes. Ecological cooling/lubrication methods for future trends in sustainable manufacturing can be listed as minimum quantity lubrication (MQL) machining, nanoparticle doped nanofluid machining, hybrid nanofluid machining, cryogenic cooling machining, and hybrid cooling/lubrication machining. © 2023 selection and editorial matter, Navneet Khanna, Kishor Kumar Gajrani, Khaled Giasin and J. Paulo Davim; individual chapters, the contributors

A novel pilot power allocation method based on energy efficiency maximization in massive MIMO systems for future generation wireless technologies

In this paper, we propose a novel pilot power allocation method that focuses on the maximization of the energy efficiency. The core algorithm of this method, which is a dynamic approach that takes into account signal-to-interference-plus-noise ratio (SINR), is called pilot power allocation polarizing SINRs (PS-PPA). The aim is to maximize the energy efficiency of the system along with the proposed pilot power allocation method using this algorithm in a multi-cell multi-user massive multiple-input multiple-output (MIMO) system. The algorithm determines difference between average SINR per cell and SINRs of users individually, during the scan of the whole cells sequentially. Therefore, it always updates the allocation for the latest SINR of users in power updates to improve the energy efficiency of the system. In power updates, PS-PPA calculates weights using an exponential function of the SINR difference. This weighting function is defined for each real number, so it can always result in a specific number. In addition, the weighting function is performed in the [ rho min,rho max$${\rho}_{min},{\rho}_{max}$$] range where the power values are predefined. The energy efficiency of the system is measured in a number of simulations by calculating the average SINR per cell. Furthermore, all these performance results are obtained for equal pilot power allocation (EPPA) and water-filling pilot power allocation (WF-PPA) schemes. As a result of simulation results, proposed pilot power allocation method has proven to be more superior than EPPA and WF-PPA methods

Receptor Tyrosine Kinase Pathway and Infiltrating Urothelial Carcinoma

Receptor tyrosine kinase pathway is frequently searched for cancer causing mutations in tumors. Emerg-ing targeted therapies are gleam of hope for them. Infiltrating urothelial carcinoma can have many morphological aspects according to their differentiation/variants. To evaluate KRAS, BRAF, and PIK3CA mutations and HER2, EGFR, and p16 expression, we divided urothelial carcinomas into two groups: differentiated/variants (n = 12) and conventional (n = 12). We compared results with clinical, demographic, histopathologic features and survival rates. No statistically sig-nificant results could be obtained in the comparison of histopathologic properties/survival rates with mutation analysis and EGFR, HER2, and p16 status. Differentiated/variants urothelial carcinoma showed higher EGFR expression (P < 0.001). Glandular differentiation was the most frequent type, followed by squamous and sarcomatoid differentiation. We observed the most common mutation at KRAS with a propensity for urothelial carcinoma with glandular differentiation. More than one mutation/high protein expression was seen in some tumors. Targeted therapies for KRAS mutation can be effective at urothelial carcinoma with glandular differentiation. Heterologous expression of relevant proteins and genes can be a cause for targeted treatment obstacle. The determination of the molecular characters of tumors is a guide in creating targeted treatment algorithms and in choosing the patient

Use of UAV Data and HEC-RAS Model for Dimensioning of Hydraulic Structures on Forest Roads

In terms of engineering standards, the dimensions of hydraulic structures such as culverts on forest roads should have the capability to drain the expected maximum discharge for a 50-year return period during their lifespan (i.e., 20 years). In Türkiye, Talbot’s formula, as empirical method, has commonly been used in determining the required cross-sectional area (CSA) of the structures. However, in practice, forest road engineers in Türkiye do not pay enough at-tention to their construction with required dimensions calculated by Talbot’s formula. In the present study, the Hydrological Engineering Centre – River Analysis System (HEC-RAS) model was used to evaluate the dimensions of installed structures in terms of their ability to drain maximum discharges, with the aim of determining the required dimensions for those that could not meet this requirement. To this purpose, the 6+000 km forest road No. 410 in Acısu Forest Enterprise, Gerede Forest Directorate (Bolu, Türkiye) was selected as the study area. In total, 15 small watersheds crossed by the forest road were delineated, with only six of them having cross-drainage structures. The HEC-RAS model geometry was generated by manual unmanned aerial vehicle (UAV) flights at altitudes of 5–15 m, providing very high spatial resolution (<1 cm). The maximum discharges of the watersheds were estimated for the HEC-RAS model using the Rational, Kürsteiner, and Soil Conservation Service-Curve Number (SCS-CN) methods. Maximum discharges of 0.18–6.03 were found for the Rational method, 0.45–4.46 for the Kürsteiner method, and 0.25–7.97 for the SCS-CN method. According to the HEC-RAS hydraulic model CSA simulations, most of the installed culvert CSAs calculated by Talbot’s formula were found to be incapable of draining maximum discharges. The study concluded that the HEC-RAS model can provide accurate and reliable results for determining the dimensions of such structures for forest roads. © 2022 by the authors

Mapping as a method of information and data collection in urban spaces: The case of Kuğulu Park

Haritalar insanların yer, mekân, kültür ve nesne kavramları ile ilişkisinin tanımlandığı, ifade ve iletişim araçlarıdır. Herhangi bir bilginin-verinin mekân üzerindeki dağılımını gösteren şema olarak da tanımlanmaktadır. Bu tanımlardan da anlaşılacağı üzere nesnelerini mekân ile kurgulamaları haritaların en önemli özelliklerinden biridir. Haritalama ise yaratıcısının algılarını yansıtan, hayal ile gerçeği bir arada barındıran, sanat, edebiyat ve bilim dâhil olmak üzere birçok alanda kullanılan bir bilgi ve veri yorumlama aracıdır. Günümüzde teknoloji büyük bir veri birikiminin oluşmasına neden olmaktadır. Bu verinin görselleştirilmesi, planlama ve tasarım için kullanılabilir hale getirilmesi, aktarılması önemli hale gelmiştir. Bu nedenle veri toplama ve yorumlama aracı olarak haritalama, planlama ve tasarım disiplinleri açısından önemli bir araç olarak görülmektedir. Mimarlıkta haritalama özellikle yapılı çevreden verilerin toplanması, yorumlanması ve kentsel tasarımda yer-kullanıcı ilişkilerinin daha iyi kavranması amacı ile kullanılmaktadır. Bu çalışmanın amacı; kentsel mekânları sosyal etkileşimlerle birlikte incelemek ve mimarlıkta haritalamanın önemini vurgulamaktır. Bu araştırma literatür çalışması ve alan çalışmaları olmak üzere iki aşamadan oluşmaktadır. Çalışmanın kavramsal temelini oluşturan kent, kentsel mekân ve haritalama ile ilgili literatür çalışması yapılmıştır. Elde edilen bilgiler ile alan çalışması gerçekleştirilmiştir. Çalışmada, seçilen belirli bir alandan toplanan bilgi ve verilerin farklı haritalama yöntemleri kullanılarak analiz edilmesi ve bu analizlerin görselleştirilmesi hedeflenmiştir. Araştırma boyunca harita analizleri, kelime bulutu, bilişsel, aktivite ve yaratıcı haritalama gibi farklı haritalama çeşitleri ve teknikleri uygulanmıştır. Ankara'nın Çankaya ilçesinde bulunan Kuğulu Park'ta aktivite haritalaması yapılmıştır. Bu yöntemin kullanılmasının amacı, kamusal alanlardaki toplanan verilerin incelenmesi, yorumlanması ve kentsel tasarımda yer-kullanıcı ilişkilerini daha iyi kavranmasını sağlamaktır. Kullanılacak haritalama yöntemleri, kentsel mekânların doğal ve dinamik süreçlerini aktarmamıza olanak sağlayacaktır. Bu çalışma; kentsel mekânların incelenmesine alternatif üreterek, mekânsal kademelenmede kamusal alanların konumunu ve haritalamanın mimariye katkısını vurgulayacaktır.Maps are means of expression and communication in which the relationship of people with the concepts of place, space, culture and object is defined. It is also defined as a diagram showing the distribution of any information-data over space. As can be understood from these definitions, one of the most important features of maps is that they construct their objects with space. Mapping, on the other hand, is an information and data interpretation tool that reflects the perceptions of its creator, combines imagination and reality, and is used in many fields including art, literature and science. Today, technology leads to the formation of a large amount of data. Visualization of this data, making it available for planning and design, and transferring it has become important. For this reason, mapping as a data collection and interpretation tool is seen as an important tool for planning and design disciplines. Mapping in architecture is especially used to collect and interpret data from the built environment and to better understand place-user relations in urban design. The aim of this study; to examine urban spaces with social interactions and to emphasize the importance of mapping in architecture. This research consists of two stages: literature study and field studies. A literature study on the city, urban space and mapping, which constitutes the conceptual basis of the study, was conducted. A field study was carried out with the obtained information. In the study, it is aimed to analyze the information and data collected from a selected area by using different mapping methods and to visualize these analyzes. Throughout the research, different mapping types and techniques such as map analysis, word cloud, cognitive, activity and creative mapping were applied. Activity mapping was carried out in Kuğulu Park in Ankara's Çankaya district. The purpose of using this method is to examine and interpret the data collected in public spaces and to provide a better understanding of place-user relations in urban design. The mapping methods to be used will enable us to convey the natural and dynamic processes of urban spaces. This work; By producing an alternative to the study of urban spaces, it will emphasize the position of public spaces in spatial grading and the contribution of mapping to architecture

Compact Operators on Cesàro sequence spaces and norms of Cesàro operators

This paper deals with the characterization of compact operators on Cesàro sequence spaces as an application of Hausdorff measure of noncompactness. Further, the norms of Cesàro operators on certain spaces are investigated. © 2023, University of Nis. All rights reserved

Monte Carlo simulation of gamma shielding properties of Lanthanum hexaboride (LaB6) and Cerium hexaboride (CeB6) materials synthesized by magnesiothermic reduction

Purpose: The purpose of this study is to synthesize the lanthanum hexaboride and cerium hexaboride materials within the optimum durability conditions and also investigate their gamma ray absorption features by using Monte Carlo method.Theory and Methods: Magnesiothermic reduction techniqe was used to synthesize materials by convenient experimental set up. Molecular structure and contents of the materials were determined using XRD and EDX spectroscopy for using the results in the Monte Carlo simulations. Beer-Lambert law was applied to calculate transmitted, absorbed and reflected quantity of incident photons directed onto material longitudinally. Atomic cross-section data of the related media were calculated by PEGS4 code of EGSnrc with broad photon energy range including low and high energy regions. After that, radiation absorption parameters such as mu/rho, HVL, TVL and MFP were calculated by using the developed code. Similar calculations were carried out by XCOM program to compare consistency of the obtained results. The calculated results were also compared with the previously investigated results for vermiculite, concrete, borosilicate, granite and lead.Results: The authors were succeeded desired purity level of the synthesized materials within the optimum conditions experimentally. It was observed from the calculated results that the lanthanum and the cerium hexaborides have higher absorption capability of gamma rays according to the aforementioned materials. It was also observed that they were more comparable with lead which is the standard shielding material.Conclusion: The results obtained from this study have showed that the synthesized materials are more promising than some previously investigated materials for radiation shielding. By thinking in terms of advantages and disadvantages, these materials may play an important role for protection of the people from hazardous effects of radiations used in medicine, industry, agriculture, nuclear power plants, research reactors, etc

Whole Exome Sequencing of ALMS1 gene Identified a Novel Pathogenic Homozygous Mutation (c.3132_3133delAC/p.Gln1045ValfsTer2) in a Turkish Family

Backgroud: Alstrom syndrome (AS) is a rare autosomal recessive disorder caused by pathogenic mutation in ALMS1 (ALMS1 centrosome and basal body associated protein) gene. Case Presentation: A 13.5-year-old male patient, who was born from consanguineous parents of Turkish descent, applied due to the complaint of obesity and non palpable testes. He had optic atrophy and hearing loss. His weight and body mass index were over 97th percentile. The fasting blood glucose level of the patient was 111 mg/dl and the patient had high level of insulin. Because AS was considered, genetic analysis of the ALMS1 gene was performed and a homozygous pathogenic (Class-II) mutation c.3132_3133delAC/ p.Gln1045ValfsTer2 was detected in the exon 8 region of the ALMS1 gene. His mother was heterozygous carrier of the same mutation. Conclusion: A novel c.3132_3133delAC mutation in ALMS1 gene cause clinical findings of AS such as obesity, reduced visual acuity, hearing loss and other systems manifestations

Testing the Factors that Determine the Profitability of Banks with a Dynamic Approach: Evidence from Turkey

The present study aims to identify the internal and external factors that affect the profitability of banks operating in Turkey. For this purpose, the study used data from 23 public, private, and foreign banks, covering the period from 2007 to 2020. Two dependent variables were used as the profitability indicators of banks, namely, the Return on Equity (ROE) and the Return on Assets (ROA). In order to increase the reliability of the models developed during the study, Dynamic Generalized Method of Moments (GMM) and Fixed Effect Model (FEM) were applied. Results of the analysis indicate a positive and statistically significant relation between inflation rate and GDP growth rate, and ROA and ROE. According to the results of GMM, there was a positive relation between ROA and ROE, and 1-year and 2-year lagged ROA and ROE. This situation may be explained by the fact that profits acquired in the Turkish banking sector are steady. ROA and ROE were observed to have a positive relation with inflation rate and economic growth rate. In other words, the increase in inflation rate and GDP growth rate positively affect profitability of public, private, and foreign banks