Niğde Ömer Halisdemir University Institutional Repository
Not a member yet
14438 research outputs found
Sort by
The effect of lesson study model on the development of social studies teacher candidates' professional skills: An action research
Get PDFEğitim Bilimleri Enstitüsü, Türkçe ve Sosyal Bilgiler Ana Bilim Dalı, Sosyal Bilgiler Eğitimi Bilim DalıDers imecesi modeli; planlama, uygulama, gözlemleme, yansıtma ve yeniden planlama gibi adımların doğurduğu verilerin, bir grup eğitimci tarafından işbirliği içinde analiz edilmesi ve gerçek sınıf ortamında derslerin gözlemlenmesi olarak tanımlanmaktadır. İşbirlikli eylem araştırması olarak da değerlendirilen bu model, ortaya çıkış coğrafyası olan Japonya'da öğretmen eğitiminde oldukça köklü bir geçmişe sahiptir. Bu araştırmada da sosyal bilgiler öğretmen adaylarının mesleki becerilerinin gelişiminde ders imecesi modelinin etkisini incelemek amaçlanmıştır. Araştırmada, nitel yaklaşım benimsenerek eylem araştırması desenine başvurulmuştur. 2021-2022 eğitim-öğretim yılının bahar döneminde Niğde ili merkez ilçeye bağlı bir ortaokulda uygulanan bu modelde, katılımcı grubu; beş son sınıf sosyal bilgiler öğretmen adayı (uygulayıcılar), araştırmacı (kolaylaştırıcı, uzman, araştırmacı), danışman (araştırmacının tez danışmanı), uygulama okulu sosyal bilgiler öğretmeni (dış uzman) ve yedinci sınıf öğrencileri oluşturmuştur. Araştırma; derslerin gözlemlenmesi, bireysel ve ortak ders planı yazımı, planlanan araştırma derslerinin uygulayıcılar tarafından sunumu, derslerin değerlendirilmesi, yeni planlar için toplantıların yapılması ve sürecin sonundaki yansıtma oturumuyla (ilgili kamuoyu ile sonuçların paylaşılması) şekillenen sekiz haftalık bir süreyi yansıtmaktadır. Bu sürede veri toplama araçları olarak şunlar kullanılmıştır: ders planları, revize ders planı, ders gözlem formu, görüşme formları, toplantı gözlem formu ve katılımcı günlüğü. Bu araçlar, nitel ve nicel veri analizi tekniği kullanılarak analiz edilmiştir. Araştırmanın sonunda, sosyal bilgiler öğretmen adaylarının mesleki becerilerinin gelişiminde ders imecesi modelinin etkisine yönelik olarak şu bulgulara ulaşılmıştır: Araştırmada öğretmen adaylarının, Ders imecesi modelini mesleki gelişimde başvurulabilir bir model olarak değerlendirdikleri görülmüştür. Araştırma derslerinin planlanması aşamasının, uygulayıcıları; planlama becerileri, konu alanı hâkimiyeti, alan bilgisi ve alan eğitimi bilgisi noktasında olumlu yönde etkilediği görülmüştür. Araştırmada, eksik olarak değerlendirilen mesleki bilginin öğreniminde ders imecesi modeli teşvik edici olarak nitelendirilmiştir. Dış uzman (uygulama okulu sosyal bilgiler öğretmeni) ve araştırmacı (kolaylaştırıcı, uzman), uygulayıcılar tarafından; yönlendirici, yardımcı, kolaylaştırıcı, rehber ve öğretici olarak nitelendirilmiştir. Araştırmada öğretmen adaylarının (uygulayıcılar), Öğretmenlik Uygulaması II dersinde ders imecesi modelinin yürütülebilirliği ve modelin derse olan katkısı hakkında hemfikir oldukları görülmüştür. Öğretmen adayları, modelin iletişim ve işbirliğini geliştirmesi durumunu, modele yönelik güçlü yön olarak belirtmiştir. Başarıyla uygulanabilmesi için modelin, uygulayıcılardan yetkinlik kazanmasını istemesi bulgusu araştırmada zayıf yön olarak değerlendirilirken, aynı öğrenci grubuna uygulanması da sınırlılık olarak ifade edilmiştir. Modeli aşamalı yapısından ötürü; piramit, tümdengelim, tümevarım, istasyon, halka, tren ve insanın yaşamda geçirdiği evreler gibi kavramlarla ilişkilendiren öğretmen adaylarının, mesleki yaşantılarında da ders imecesi uygulamalarını meslektaşları ile deneyimlemeyi düşündükleri görülmüştür. Araştırmanın bulguları ışığında da modelin yaygınlaştırılması, farklı branş, kademe ve derslerde çeşitli desenler aracılığıyla uygulanması ve öğretmen mesleki gelişimi ile hizmetiçi eğitim kapsamında kullanılması önerilmektedir.The Lesson Study Model is defined as the collaborative analysis of the data generated by steps such as planning, conducting, observing, reflecting and re-planning by a group of educators and the observation of lessons in the live classroom environment. This model, which is also considered as collaborative action research, has a long-established history in teacher education in Japan, where it originated. In this study, it was aimed to examine the effect of the lesson study model on the development of social studies teacher candidates' professional skills. In the study, qualitative approach was adopted and action research method was applied. In this model, which was implemented in a secondary school in the central district of Niğde province in the spring semester of the 2021-2022 academic year, the participant group consisted of five senior social studies teacher candidates (practitioners), the researcher (facilitator, expert, researcher), the supervisor (the researcher's thesis supervisor), the social studies teacher of the implementation school (external expert), and seventh grade students. The research reflects an eight-week period characterized by observation of lessons, writing individual and joint plans, presentation of the planned research lessons by the practitioners, evaluation of the lessons, meetings for new plans, and a reflection session at the end of the process (sharing the results with the relevant public). During this period, the following were used as data collection tools: lesson plans, revised lesson plans, lesson observation forms, interview forms, meeting observation forms and participant diaries. These tools were analyzed using qualitative and quantitative data analysis techniques. At the end of the study, the following findings were reached regarding the effect of the lesson study model on the development of social studies teachers' professional skills: In the study, it was seen that teacher candidates' evaluated the Lesson Study model as a model that can be used in professional development. Practitioners of the research course planning phase; It has been observed that it has a positive effect on planning skills, subject area mastery, field knowledge and field education knowledge. In the study, the lesson study model was described as encouraging in the learning of professional knowledge that was evaluated as missing. The external expert (the social studies teacher of the implementation school) and the researcher (facilitator, expert) were characterized by the practitioners as directive, helpful, facilitator, guide and instructor. In the study, it was seen that teacher canditates' (practitioners) agreed on the feasibility of the lesson study model in the Teaching Practice II course and the contribution of the model to the course. The teacher candidates stated that the model's development of communication and cooperation was a strength of the model. While the finding that the model requires practitioners to gain competence in order to be successfully implemented was considered as a weakness in the research, the fact that it was applied to the same group of students was expressed as a limitation. It was seen that the teacher candidates', who associated the model with concepts such as pyramid, deduction, induction, station, ring, train and stages of human life due to its gradual structure, thought of experiencing lesson study practices with their colleagues in their professional lives. In the light of the findings of the research, it is recommended that the model be disseminated, applied through various patterns in different branches, levels and courses, and used within the scope of teacher professional development and in-service training
Melatonin modulates lipopolysaccharides-induced inflammatory response and maintains circadian rhythm associated with histone H3 acetylation in bovine mammary epithelial cells
Get PDFLipopolysaccharides (LPS) can disrupt the barrier function of mammary epithelial cells, leading to mastitis. The protective effects of melatonin (MT) have been demonstrated against various infections, but the underlying mechanism remains unclear in LPS-induced bovine mastitis. This study, therefore, aimed to investigate the modulatory effect of melatonin (MT) on LPS-induced inflammation in bovine mammary epithelial cells (BMECs), its influence on the disruption of circadian rhythms triggered by this inflammation, and the potential underlying molecular mechanisms. BMECs extracted from lactating cows underwent one of 4 treatments in triplicates for 12 h simultaneously: Control (CON), LPS (exposed to LPS at 1 mu g/mL), MT (exposed to MT at 40 mu mol/L), or LPS + MT (LMT, exposed to both LPS at 1 mu g/mL and MT at 40 mu mol/L). The flow cytometry results demonstrated that MT reduced the ratios of cells in the G0/G1 phase but increased those in the G2/M phase (P < 0.05). Additionally, MT inhibited p65 phosphorylation levels, leading to a decreased cellular inflammatory response (P < 0.05). Treatment with MT elevated the acetylation levels of histone H3 in BMECs compared to the LPS treatment (P < 0.05). The circadian rhythm analysis revealed a significant increase in the gene expression levels of BMAL1, PER1, CRY1, and CRY2 at the 12 h mark in LMT compared to the LPS treatment (P < 0.05). Additionally, this study assessed the fluctuations in clock-related genes PER2 and CLOCK over 24 h under various treatment conditions. The results demonstrated that BMECs exposed to LMT treatment exhibited a significant increase in the expression levels of CLOCK and PER2 genes from 4 to 24 h in comparison to the LPS treatment (P < 0.05). Moreover, cells in the LMT treatment displayed a more regular circadian rhythm cycle compared to those in the LPS treatment. Overall, the data suggest that MT could alleviate the inflammatory response in BMECs by upregulating histone H3 acetylation, thereby maintaining the physiological circadian rhythm of BMECs.National key research and development program [2021YFC2103004]; Excellent Doctoral Dissertation Fund of Yangzhou University and International Academic Exchange Fund for Graduate Students of Yangzhou University; Construction and Demonstration of Ecological Circulation Safety Breeding Model for Meat Sheep in Southern Xinjiang [2021DB014]This study was financially supported by the national key research and development program (2021YFC2103004) , Construction and Demonstration of Ecological Circulation Safety Breeding Model for Meat Sheep in Southern Xinjiang (2021DB014) , the Excellent Doctoral Dissertation Fund of Yangzhou University and International Academic Exchange Fund for Graduate Students of Yangzhou University. We thank the University of Melbourne and Xinjiang Academy of Agricultural and Reclamation Sciences for the cooperation that made this paper possible
Farkılı yetiştirme sistemi ve yumurta tavuğu genotipinnin davranış, refah, performans ve yumurta kalitesi özellikleri üzerindeki etkisi
Get PDFFen Bilimleri Enstitüsü, Hayvansal Üretim ve Teknolojisi Ana Bilim DalıBu çalışmada, farklı yetiştirme sistemleri ve genotipleri, yumurtacı hibritlerin, davranış, refah, performans ve yumurta kalitesi özellikleri üzerindeki etkisi araştırılmıştır. Araştırmanın hayvan metaryali Lohmann ISL Classic (W) ve Lohmann Sandy (S), Yetiştirme sistemleri ise altlıklı yer sistemi (DL) ve serbest mera sistemidir. Mera sisteminde Mentha piperita (MP), Petroselinum crispum (PC) ve Medicago sativa (MS)'da bitkileri kullanılmıştır. Araştırmada mera alanı kullanımı genotipler arasında ve bitki türleri arasında farklılık göstermiştir (P<0.01). Yetiştirme sistemi ve genotip, toplam tüy skorunu, bazı davranışları, ilk yumurtlama ve %50 yumurta verim yaşını, tavuk-gün yumurta verimini, toplam yumurta ağırlığını ve yumurta büyüklüğü dağılımını etkilemiştir (P<0.01; P<0.05). Yetiştirme sisteminin, yüz uzunluğunun oransal asimetri, yumurtlama döneminde yem tüketimi, yemden yararlanma oranı, yumurta yüzey alanı ve kabuk kalite özelliklerini önemli ölçüde etkilediği belirlenmiştir (P<0.01; P<0.05). Genotip, tavukların ibik yüzey ve rektal sıcaklıkları, yem tüketimi, yumurta şekil indeksini, kabuk kalınlığını, ak ve sari özelliklerini önemli ölçüde etkilemiştir (P<0.01; P<0.05). Sonuç olarak, bitki türleri, yetiştirme sistemi ve genotipi, tavuklarda bazı refah özelliklerini, davranışları, performansı ve yumurta kalitesi özelliklerini modüle etmektedir.This study investigated the effect of different production systems and laying hen genotypes on welfare, behavior, performance, and egg quality characteristics. Lohmann LSL Classic (W) and Lohmann Sandy (S) genotypes were evaluated in the deep litter system (DL), and free access to outdoor Mentha piperita (MP), Petroselinum crispum (PC), and Medicago sativa (MS). Range use varied between genotypes and among plant species (P<0.01). Both the production system and genotype influenced the total feather score and the proportion of hens expressing some behaviors, age at first egg and 50% egg production, hen-day egg production, overall egg weight, and egg size distribution (P<0.01; P<0.05). It was determined that the production system significantly influenced the fluctuating asymmetry of face length, feed intake during the egg-laying period, feed conversion ratio, egg surface area, and shell quality traits (P<0.01; P<0.05). Hen genotype significantly impacted comb and rectal temperatures, feed intake, shape index, shell thickness, and albumen and yolk traits (P<0.01; P<0.05). In conclusion, the plant species, production system, and hen genotype modulate some welfare traits, behaviors, performance, and egg quality characteristics in hens
Nanoakışkanların elektriksel iletkenlik ve stabilitelerinin yapay sinir ağları ile modellenmesi: Kütlesel oran ve sıcaklığa bağlı korelasyon türetilmesi
Get PDFHazırlanma sürelerinin uzun olması ve termofiziksel özelliklerinin belirlenmesinin zahmetli olması nanoakışkan çalışmalarını yapay zekâ destekli modelleme çalışmalarına yönlendirmiştir. Bununla birlikte yapılan modelleme çalışmaları ağırlıklı olarak ısıl iletkenlik ve viskozite üzerine yoğunlaşmıştır. Bu çalışmada, nanoakışkan çalışmalarında genellikle ihmal edilen stabilite ve elektriksel iletkenlik göz önüne alınarak, %0.1-%3 kütlesel oran ve 20°C-70°C sıcaklık aralığındaki MgO/EG nanoakışkanların pH, elektriksel iletkenlik ve zeta potansiyelini tahmin etmek için bir yapay sinir ağları modeli geliştirilmiştir. Geliştirilen modelin MSE ve R2 değeri sırasıyla 0.011118 ve 0.99987 iken, pH, elektriksel iletkenlik ve zeta potansiyeli için ortalama mutlak MoD değerleri ise sırasıyla %0.11, %0.78 ve %0.74 olarak belirlenmiştir. Bahsi geçen bu performans parametreleri geliştirilen ağın yüksek performanslı olduğunu ortaya koymuştur. Ayrıca model verileri kullanılarak literatürde ilk defa bu üç özellik için de geçerli, katsayıları birbirinden farklı ortak bir korelasyon ortaya konulmuştur. Yeni korelasyonun pH, elektriksel iletkenlik ve zeta potansiyeli için ortalama mutlak MoD değerleri sırasıyla %0.35, %2.08 ve %1.54’tür. Deneysel veriler ile mutlak % hata değerlerini ortaya çıkaran bu değerler yeni korelasyonun yüksek doğrulukta tahmin yeteneğini ortaya koymaktadır
The effect of powder and pellet forms of added metal hydride materials on reaction kinetics and storage
Get PDFIn the present research, metal hydride pellets were synthesized to enhance the kinetics of hydrogen charge/ discharge processes. By incorporating ENG (expanded natural graphite) and copper additives, we observed improvements in the heat transfer coefficients and storage capacities of the hydrogen storage materials. The reactor is designed to contain 1000 g of storage material in the form of powder or 25 pellets each weighing 40 g. The influence of storage materials with enhanced thermal conductivity on the hydrogen charge/discharge process was experimentally studied in a metal hydride reactor under a pressure of 10 bar. The reactor was heated under vacuum (10-4-4 mmHg) to approximately 200 degrees C for 2 h in order to complete the activation process. Following the heating process, the reactor was allowed to cool to ambient temperature, after which the hydrogen was introduced to the reactor at 10 bar pressure for 50 min. The absorption and desorption procedure was reiterated up to 20 cycles, and recordings of data were taken at intervals of 5 cycles to monitor the variations between the cycles. After 10 charge/discharge cycles under pressure of 10 bar, the hydrogen stored in the reactor amounted to approximately 9.93 g in pellet form and 7.20 g in powder form.Scientific and Technical Research Council of Turkey (TUBITAK) [121M529]; Council of Higher Education (YOK)The authors would like to thank The Scientific and Technical Research Council of Turkey (TUBITAK) for the financial support under contract number 121M529. 100/2000 PhD. Scholarship Program governed by Council of Higher Education (YOK) is also acknowledged
In firearms and air shooting examination of the factors affecting the pre-competition stress levels of licensed athletes
Get PDFSosyal Bilimler Enstitüsü, Beden Eğitimi ve Spor Ana Bilim Dalı, Spor Bilimleri Bilim DalıBu çalışma, ateşli ve havalı silah branşında lisanslı sporcuların müsabaka öncesi stres düzeylerini etkileyen faktörlerin incelenmesi amacıyla gerçekleştirilmiştir. 13-14 Ocak Havalı ve Ateşli Silahlar Türkiye Şampiyonası'na katılan lisanslı sporcular arasından gönüllü olarak katılım gösteren 111 kadın, 150 erkek toplam 261 katılımcı ile gerçekleştirilmiştir. Verilerin toplanmasında Spor Karşılaşmaları Kaygı Testi adlı anket kullanılmış ve toplanan veriler JASP (Java Analysis Software Package) programı ile değişkenler açısından incelenmiştir. Cinsiyet, medeni durum, derece var/yok, müsabakaya katılma/katılmama, katılım var derece var/yok değişkenlerinin müsabaka öncesi stres puanına etkisinin belirlenmesinde Bağımsız Gruplar T testi, spor yapılan yıl, yaş ve eğitim düzeyi değişkenlerinin müsabaka öncesi stres puanına etkisinin belirlenmesinde ise One-way ANOVA ve Post Hoc Turkey testleri kullanılmıştır. İstatistiksel testler sonucunda müsabaka öncesi stres düzeyleri ile yaş, medeni durum, spor yapılan yıl, derece var/yok ve eğitim düzeyleri değişkenleri arasında anlamlı bir ilişki saptanmıştır (p0,05).This study was conducted to examine the factors affecting the pre-competition stress levels of licensed athletes in firearms and air weapons branch. The study was carried out with a total of 261 participants, 111 females and 150 males, who voluntarily participated in the 13-14 January Air and Firearms Turkey Championship. A questionnaire called Sport Competitions Anxiety Test was used to collect the data and the collected data were analysed in terms of variables with JASP (Java Analysis Software Package) programme. One-way ANOVA and Post Hoc Turkey tests were used to determine the effect of gender, marital status, degree present/degre, participation/non-participation, participation present/degree present/absent variables on pre-competition stress score, in addition, One-way ANOVA and Post Hoc Turkey tests were used to determine the effect of years of experience in sport and education level variables on pre-competition stress score. As a result of statistical tests, a significant relationship was found between the pre-competition stress levels and the variables of age, marital status, years of sport, having/not having a degree and education level (p0,05)
The Role of Local Governments in The Context of Disaster Communication and Social Media: The Example of 06 February 2023 Kahramanmaraş Earthquake
Get PDFThe February 06, 2023, Kahramanmaraş earthquake brought great destruction and loss of life to the region. In times of crisis, effective disaster communication is crucial to ensure public safety and facilitate response efforts. Local governments play a critical role in managing and disseminating information during disasters using various communication channels, including social media. This research aims to analyze the role of local governments in disaster communication during the Kahramanmaraş earthquake. In particular, it examined how local governments use social media for disaster communication, the strategies they use to manage information dissemination, and the effectiveness of their communication efforts. By exploring these key issues, this study aims to provide insights into the vital role of local governments in disaster communication and contribute to improving future disaster response efforts. In this context, using the case study method, the posts of Kahramanmaraş Metropolitan Municipality on X accounts were analyzed between February 06, 2023, and March 09, 2023
Nonequivalent Antiferromagnetically Coupled Sublattices Induce Two-Step Spin-Crossover Transitions: Equilibrium and Nonequilibrium Aspects
Get PDFAs a continuation to the previously published work (Yal & ccedil;& imath;n et al. (2022)), we investigate the equilibrium and nonequilibrium properties of the spin-crossover systems, with a specific focus on the nonequivalent sublattice, and compare these properties with those of the equivalent sublattices. We used the lowest approximation of the cluster variation method (LACVM) to derive the static equations for the order parameters of the two sublattices and determine high-spin fraction in relation to temperature and external magnetic field in a spin-crossover system. At a low temperature, the transition from stable high-spin (HS) state where nHS=1 occurs in the plateau region, where nHS=0.5 for nonequivalent sublattices. The order parameters for non-equivalent sublattices exhibit different states at the transition temperature. Also, we study the nonequilibrium properties of the order parameters and high-spin fraction using the path probability method (PPM). With the current model, we obtain and analyze the relaxation curves for the order parameters Sa, Sb, and high-spin fraction. These curves demonstrate the existence of bistability at low temperatures. At the end of this study, we present the flow diagram that shows the order parameters for different temperature values. The diagram exhibits states that are stable, metastable, and unstable
Tuning the Proportional-Integral-Derivative Control Parameters of Unmanned Aerial Vehicles Using Artificial Neural Networks for Point-to-Point Trajectory Approach
Get PDFNowadays, trajectory control is a significant issue for unmanned micro aerial vehicles (MAVs) due to large disturbances such as wind and storms. Trajectory control is typically implemented using a proportional-integral-derivative (PID) controller. In order to achieve high accuracy in trajectory tracking, it is essential to set the PID gain parameters to optimum values. For this reason, separate gain values are set for roll, pitch and yaw movements before autonomous flight in quadrotor systems. Traditionally, this adjustment is performed manually or automatically in autotune mode. Given the constraints of narrow orchard corridors, the use of manual or autotune mode is neither practical nor effective, as the quadrotor system has to fly in narrow apple orchard corridors covered with hail nets. These reasons require the development of an innovative solution specific to quadrotor vehicles designed for constrained areas such as apple orchards. This paper recognizes the need for effective trajectory control in quadrotors and proposes a novel neural network-based approach to tuning the optimal PID control parameters. This new approach not only improves trajectory control efficiency but also addresses the unique challenges posed by environments with constrained locational characteristics. Flight simulations using the proposed neural network models have demonstrated successful trajectory tracking performance and highlighted the superiority of the feed-forward back propagation network (FFBPN), especially in latitude tracking within 7.52745 x 10-5 RMSE trajectory error. Simulation results support the high performance of the proposed approach for the development of automatic flight capabilities in challenging environments
Pedal curves obtained from Frenet vector of a space curve and Smarandache curves belonging to these curves
Get PDFIn this study, first the pedal curves as the geometric locus of perpendicular projections to the Frenet vectors of a space curve were defined and the Frenet vectors, curvature, and torsion of these pedal curves were calculated. Second, for each pedal curve, Smarandache curves were defined by taking the Frenet vectors as position vectors. Finally, the expressions of Frenet vectors, curvature, and torsion related to the main curves were obtained for each Smarandache curve. Thus, new curves were added to the curve family