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Use of banana peel for the removal of boron from aqueous solutions in the batch adsorption system
No full textIn this study, the use of banana peels (BP) as a biosorbent which is considered agricultural waste for boron adsorption was investigated. The important operating parameters (pH, biosorbent dose, and contact time) affecting the batch adsorption system were examined. As a result of the conducted experiments, it was determined that the BP dose was 2 g/L, the initial pH was 6.07, and the contact time was 30 min. The maximum boron removal efficiency was achieved at approximately 66% under these conditions. In addition, different isotherms and kinetics were applied in this study. The R2 values of the pseudo-second-order kinetic model and the Freundlich isotherm were determined as 0.9694 and 0.9703, respectively. The maximum adsorption capacity of BP was calculated as 3.40 mg/g according to isotherms. SEM and FTIR analyses were performed to reveal the morphological and functional status of BP. The BP has a non-homogeneous macropores surface and predominantly hydroxyl (–OH), carboxyl (C–C), and amine (N–H) groups. As a result of the study, it was revealed that BP was an environmentally friendly, economical, and easily available biosorbent for boron removal. Graphical abstract: [Figure not available: see fulltext.]
Fostering creative thinking skills to burst the effect of emotional intelligence on entrepreneurial skills
No full textA good deal of study has already been revealed compact bilateral relationships between creative thinking, entrepreneurship, and emotional intelligence among teacher candidates. However, a compact review of the literature will not find a study with a sample of teacher candidates investigating the mediating effects of creative thinking in the relationship between their emotional intelligence and entrepreneurship. In this respect, missing from the literature is an actual constructed data-driven knowledge that promotes to understanding of systematic rationality of supposed associations. To that end, the current research designed in a descriptivecorrelational structural equation model (Covariance based) to test a developed hypothetical model bearing upon the literature. A survey was deployed to gather the data of 412 teacher candidates. 297 of these were females and 115 were males. The data analysis techniques were confined to descriptive, correlational, and prediction algorithms of the SPSS and the AMOS's standardized regression coefficients and the goodness of fit indices for the path model. The results uncovered that the emotional intelligence positively predicted the entrepreneurship and creative thinking. In this way, we understand that when the emotional intelligence increases, entrepreneurship and creative thinking also increase. On the other hand, creative thinking positively predicted the entrepreneurship. Specifically, entrepreneurship increases when creative thinking increases. In closing, teacher candidates' creative thinking played a significant role in the relationship between their emotional intelligence and entrepreneurship. The implication of these results can be advantageous for the planning and designing more effective courses of teacher education in accordance with the 21st century educational trends
Teacher noticing of students’ thinking in the context of mathematical modeling activities related to statistics
No full textIn this study, we investigated mathematics teacher’s noticing of students’ thinking in the context of mathematical modeling activities (MEAs) related to statistics. One middle-school mathematics teacher participated in the study, which adopted a case study design. Data were collected through interviews with the teacher based on video recordings of students’ group work, the written works of the students, and the researchers’ observations and field notes. As students evolved from first-draft solutions to more powerful, sharable ways of thinking about the modeling activity, the teacher focused on student thinking related to four distinct aspects of the overall modeling activities: understanding the problem, manipulation, interpretation, and verification. She mostly focused on procedural aspects of students’ thinking during the manipulation step. Her attention and interpretation of the manipulation step focused on the students’ (a) identification of the solution (how students reach the solution), (b) reasons why they selected these solutions (explanations and justifications of the solutions), and (c) features of the solutions they used. The teacher also noticed how the students’ performances depended on the structure of the activity (whether a data set was given). She pointed out that MEAs support students’ engagement, conceptual understanding, skills related to statistics, and ability to use data processing concepts in their daily lives
Hydrogen production through alkaline electrolyzers: a techno-economic and enviro-economic analysis
No full textHydrogen production through an alkaline electrolyzer as well as a techno-economic and enviro-economic analysis are presented. The proposal of this innovative study is to generate hydrogen gas energy from an alkaline electrolyzer energy system. The prototype of this alkaline electrolyzer was developed by application of hydrogen production through alkaline electrolyzer optimization. This novel chemical mixture is made up from the combination of ammonia, ethyl alcohol, urea, and deionized or distilled water. The result proved to be a model study by emphasizing the annual profit of the alkaline electrolyzer of a simple payback period of the prototype system. A prototype of alkaline electrolyzer is designed and developed to produce oxyhydrogen gas through water electrolysis
Environmentally friendly viscosity-modifying agent for self-compacting mortar: Cladophora sp. cellulose nanofibres
No full textAdmixtures such as viscosity modifying agents and mineral admixtures could be used to regulate the rheological behaviour of the self-compacting concrete mixture. Herein, cellulose nanofibres obtained from Cladophora sp., a bio-waste that pollutes water bodies and threatens the ecosystem, were used to provide appropriate plastic viscosity in self-compacting mortars instead of a traditional viscosity modifying agent known as Welan gum (WG). Within the scope of the study, mini-slump, mini-V funnel, viscosity tests, compressive-flexural strength tests and FE-SEM analyses were performed on the mortar and cement paste specimens prepared. According to the rheological results, increases of up to 93% in plastic viscosity and increases of up to 10 times in yield stress were observed in the CCF-used specimens. On the other hand, increases in yield stress up to seven times and in plastic viscosity up to 37% were determined in the specimens with WG added. Moreover, as a result of mechanical tests, increases of up to 15% in compressive strength and up to 7% increases in flexural strength were observed in the WG-added specimens. While the decreases of up to 4% in compressive strength were observed, increases of up to 12% in flexural strength were detected in the CCF-added specimens
Detection of N-hexanoyl-L-homoserine lactone via MIP-based QCM sensor: preparation and characterization
No full textWhile high living organisms use sounds and words to communicate with each other, bacteria provide this function with some communication molecules. These communication molecules are expressed as “Quorum Sensing” (QS) or chemicals produced by the environment sensing system and used by bacteria to communicate. This case revealed that bacteria are talking. N-acyl-homoserine-lactones (AHL), which are the main signaling molecules of gram-negative bacteria, may express the pathogenic factors, and Quorum Sensing (QS) system may play an important role in the identification of the being virus. AHLs are produced at low concentrations that are difficult to detect with general techniques. In this study, molecularly imprinted polymeric membranes, which are specific to lactone with 6-carbons (C6-HSL) were prepared on QCM chips, and molecularly imprinted QCM chips were utilized to detect N-hexanoyl-L-homoserine lactone (C6-HSL) with high sensitivity from the aqueous medium. Characterization of the synthesized polymers were analyzed by AFM, SEM, contact angle and FTIR-ATR spectrophotometer analyzes. The maximum C6-HSL adsorption on the C6-HSL imprinted QCM chip surface was observed at 1000 ng/mL concentration, pH 7.0. Moreover, GC–MS results correlated with the results of our studies, and they confirmed the sensitivity of synthesized polymers toward C6-HSL in solution containing competitor molecules
Hiperbolik uzaylarda sabit nokta teorisi üzerine bazi sonuçlar
Full text linkNormlu uzaylar gibi lineer yapılara çok benzeyen konvekslik özelliklerine sahip olan hiperbolik uzaylar, sabit nokta teorisi için verimli bir çalışma alanı olmuştur. İlgili literatür incelendiğinde klasik sabit nokta iterasyon yöntemlerinin hiperbolik uzaylara taşınmasıyla birçok sabit nokta teoreminin elde edildiği görülebilir. Bu tez dört bölümden oluşmaktadır. Birinci bölümde sabit nokta teorisine dair literatür bilgisi verilmiştir. İkinci bölümde klasik analiz ve fonksiyonel analize ait temel kavramlar verilmiştir. Üçüncü bölümde bazı sabit nokta iterasyon yöntemleri ile yeni iterasyon yöntemine yer verilmiş ve bu yöntem kullanılarak yakınsaklık, yakınsaklık denkliği, yakınsaklık hız analizi ve veri bağlılığı gibi bazı sabit nokta teoremleri elde edilmiştir. Dördüncü bölümde bu çalışmada elde edilen sonuçlar özetlenmiş ve ileride yapılabilecek olası çalışmalara yer verilmiştir.Hyperbolic spaces, which have convexity properties very similar to linear structures such as normed spaces, have been a productive field of study for fixed point theory. When the relevant literature is examined, it can be seen that many fixed point theorems are obtained by transferring the classical fixed point iteration methods to hyperbolic spaces. This thesis consists of four parts. In the first chapter, literature information about fixed point theory is given. In the second part, the basic concepts of classical analysis and functional analysis are given. In the third chapter, some fixed point iteration methods, and newly defined iteration method are given and some fixed point theorems such as convergence, the equivalence of convergence, convergence speed, and data dependency are obtained by using this method. In the fourth chapter, the results obtained in this study are summarized and possible future studies are given
Graduate school of social sciences examination of graduate thesis on early literacy between 2012-2022
No full textBu çalışma, 2012-2022 yılları arasında Türkiye'de erken okuryazarlık alanında yapılmış lisansüstü tezleri çeşitli başlıklar altında incelemek ve ulusal literatürde ne boyutta olduğunu belirlemek amacı ile yapılmıştır. Çalışmada nitel verilere dayalı doküman incelemesi modeli kullanılmıştır. Araştırmanın örneklemi amaçlı örnekleme yöntemlerinden ölçüt örnekleme ile belirlenmiştir. Araştırmanın örneklemini Yüksek Öğretim Kurulu'nun (YÖK) Ulusal Tez Merkezi'nde erken okuryazarlık anahtar sözcüğü kullanılarak tez adında bu kavramın kullanıldığı 44 lisansüstü tez oluşturmaktadır. 44 lisansüstü tezden 33'ü yüksek lisans, 11'i doktora tezidir. YÖK Ulusal Tez Merkez'inde ulaşılan 2012-2022 yılları arasında en fazla lisansüstü tezin 2021 yılında yapıldığı, yine aynı yıllar içinde erken okuryazarlık ile ilgili yapılan lisansüstü tezlerin 15 üniversiteye ait olduğu görülmüştür. Erken okuryazarlık ile ilgili lisansüstü tezlerin büyük çoğunluğunun yüksek lisans düzeyinde yapıldığı ve doktora düzeyindeki tez çalışmalarının daha az olduğu belirlenmiştir. İncelenen tezler eşit frekans sayıları ile en fazla eğitim bilimleri ve sosyal bilimler enstitülerinde ve yine eşit frekans sayıları ile en fazla çocuk gelişimi ve eğitimi ile temel eğitim anabilim dallarında yapılmıştır. İncelenen tezlerde araştırmacıların cinsiyetlerinin çoğunlukla kadın olduğu, çalışılan örneklem dağılımında en çok öğrencilerle çalışıldığı, tezlerde en çok kullanılan araştırma deseninin tarama olduğu ve tezlerde en çok nicel yöntem kullanıldığı tespit edilmiştir. Ele alınan lisansüstü tezlerde veri toplama araçlarının ve araştırma başlıklarının dağılımları incelendiğinde veri toplama aracı olarak en fazla ölçek kullanıldığı, araştırma başlığı olarak da erken okuryazarlık becerilerinin çeşitli değişkenler ile ilişkilerinin incelendiği görülmüştür.This study was conducted with the aim of examining the postgraduate theses in the field of early literacy in Turkey between the years 2012-2022 under various headings and determining the extent of it in the national literature. The document analysis model which is based on qualitative data was used in the study the sample of the research was determined by criterion sampling, which is one of the purposeful sampling methods. The sample of the research consists of 44 postgraduate theses in which this concept is used in the title of the thesis by using the keyword early literacy at the National Dissertation Center of the Council of Higher Education (YÖK). 33 of the 44 postgraduate theses are master's degree and 11 are doctoral dissertations. It has been observed that the most postgraduate theses were completed in 2021 between the years of 2012-2022, which were reached at the Council of higher education National Thesis Center. In addition, it has been observed that the postgraduate theses in the field of early literacy are completed in the same years belonged to 15 universities. It has been determined that the vast majority of postgraduate theses related to early literacy are done at the master's degree level, and there are fewer doctoral-level thesis studies. The theses examined were done at most at the institutes of educational sciences and social sciences with equal frequency numbers also at most at the departments of child development and education and basic education with equal frequency numbers. It has been determined that the gender of the researchers in the examined theses is mostly female. Most of the research sample consists of students. It has been determined that the most used research pattern in theses is scanning. In addition It has been found that quantitative method is used the most in theses. When the distributions of data collection tools and research titles were examined in the graduate theses the matter in hand, it was observed that the scale was used the most as a data collection tool
Koçansız Şeker Mısırı Silajlarının Kalitesine Sodyum Format Katkısının Etkisi
Full text linkThis study was carried out to determine the effects of different levels of organic acid-based sodium formate (SF) addition on nutrient contents, fermentation quality, dry matter intake, digestible dry matter, and relative feed value of no-cob sweet corn silages. In the experiment, groups were formed by adding 0 % SF (control group), 1 % SF and 2 % SF to no-cob corn, and the fermentation period continued for 60 days. At the end of the study, it was determined that SF supplement decreased the dry matter, crude protein, crude oil, ADF, NDF, starch, ME, acetic acid, propionic acid, butyric acid, and ethanol contents of corn silages, whereas it increased lactic acid, crude ash, and starch levels. In addition, it was found that the pH values of the experiment silages were statistically decreased with the addition of 1 % SF; dry matter intake, digestible dry matter, and relative feed values were found to increase. At the end of the study, it was concluded that 1 % SF addition could be used because of its positive effect on the fermentation properties and dry matter intake, digestible dry matter, and relative feed values as well as pH lowering and lactic acid-increasing effect of no-cob corn silages.Bu çalışma, farklı düzeylerde organik asit temeline dayalı sodyum format (SF) ilavesinin koçansız şeker mısır silajlarının ham besin madde içerikleri, fermentasyon kalitesi, kuru madde tüketimi, sindirilebilir kuru madde ve nispi yem değeri üzerine etkisini tespit etmek amacıyla yürütülmüştür. Araştırmada, koçansız mısır hasıllarına %0 SF (kontrol grubu); %1 SF ve %2 SF ilave edilerek gruplar oluşturulmuş ve 60 gün fermentasyona bırakılmıştır. Araştırma sonunda, SF katkısının mısır silajlarının kuru madde, ham protein, ham yağ, ADF, NDF, nişasta, ME, asetik asit, propiyonik asit, bütirik asit ve etanol içeriklerini azalttığı, buna karşılık laktik asit, ham kül ve nişasta düzeylerini artırdığı tespit edilmiştir. Ayrıca araştırma silajlarının pH değerlerinin, %1 SF ilavesiyle istatistiksel olarak önemli düzeyde azaldığı belirlenirken; kuru madde tüketimi, sindirilebilir kuru madde ve nispi yem değerlerinin ise arttığı tespit edilmiştir. Araştırma sonunda, %1 SF ilavesinin koçansız mısır silajlarının pH’sını düşürücü ve laktik asit artırıcı etkisinin yanı sıra kuru madde tüketimi, sindirilebilir kuru madde ve nispi yem değerleri üzerine pozitif etkisi nedeniyle kullanılabileceği sonucuna varılmıştır
Yumurtaya Verilen Monosodyum Glutamat’ın Tavuklard
Full text linkThe aim of this study was to investigate the effects of monosodium glutamate (MSG) in ovo administration on embryonic skeletal muscle development in chicken embryos, using histological, histopathological, and immunohistochemical methods. In this study, a total of 410 fertilized chicken eggs were used and were divided into five group as control, vehicle control, low-dose group (0.12 mg/g egg MSG), medium-dose group (0.6 mg/g egg MSG), and high-dose group (1.2 mg/g egg MSG). At incubation days 18 and 21, eggs from each group were opened and six live embryos were obtained. The embryos were sacrificed by decapitation, and skeletal muscle tissue samples (musculus fibularis longus and musculus sternocoracoideus pectoralis) were obtained. Sections were stained with hematoxylin-eosin. Moreover, caspase-3 reactivity was determined using the immunohistochemical method. Muscle development was delayed in the MSG groups and the number of caspase3-positive cells was higher (p < 0.05) than in the controls. Histopathological examinations revealed degenerative and necrotic changes in the skeletal muscle. Muscle degeneration (edema, muscle fiber degeneration, Zenker’s necrosis, and mononuclear cell infiltrations) were observed in all groups, except for the control groups. It was concluded that MSG could adversely affect the development of the skeletal muscle.Bu çalışmanın amacı yumurtaya verilen monosodyum glutamat (MSG)’ın civcivlerde iskelet kasının embriyonik gelişimi üzerindeki etkilerinin histolojik, histopatolojik ve immunohistokimyasal yöntemlerle araştırmaktı. Bu çalışmada 410 adet döllü tavuk yumurtası kullanıldı ve kontrol, taşıyıcı kontrol, düşük doz grup (0.12 mg/g MSG), orta doz grup (0.6 mg/g MSG) ve yüksek doz grup (1.2 mg/g MSG) olarak 5 gruba ayrıldı. Kuluçkanın 18 ve 21. günlerinde, her bir gruptan yumurtalar açıldı ve 6 canlı embriyo elde edildi. Embriyolar dekapitasyon ile sakrifiye edildi ve iskelet kası (musculus sternocoracoideus pectoralis, musculus fibularis longus) doku örnekleri alındı. Kesitler Hematoksilen-Eozin boyama yöntemi ile boyandı. Caspase-3 reaktivitesi ise immünohistokimyasal yöntemle belirlendi. Kas gelişiminin MSG uygulanan gruplarda geri kaldığı ve caspase-3 immunpozitif hücrelerin kontrol grupları ile karşılaştırıldığında daha fazla olduğu dikkati çekti (p<0.05). Histopatolojik incelemelerde iskelet kasında dejeneratif ve nekrotik değişiklikler saptandı. Kontrol ve distile su grubu hariç tüm gruplarda kaslarda dejenerasyon (ödem, kas fibrillerinde dejenerasyon, Zenker nekrozu ve mononükleer hücre infiltrasyonu) gözlendi. MSG'nin iskelet kası gelişimi üzerine olumsuz etkilerinin olabileceği sonucuna varılmıştır