Volatilitede uzun hafıza ve yapısal kırılma: Borsa Istanbul örneği

The aim of this paper is to examine validity of the efficient market hypothesis in Borsa İstanbul. Daily returns series are calculated by using daily closing price for BİST100 and BİST30 indices for periods of 1988-2014 and the presence of long memory on the volatility of the returns series is examined by means of Adaptive-FIGARCH (A-FIGARCH) model proposed by Baillie and Morana (2009). Empirical results suggest that there are multiple structural breaks on variance of returns series and A-FIGARCH model outperforms. In addition, it is found evidence in favor of long memory on the conditional variance of returns series and hence it can be said that Borsa İstanbul is not weak form efficient market

LONG MEMORY AND STRUCTURAL BREAKS ON VOLATILITY: EVIDENCE FROM BORSA ISTANBUL

Bu çalışmanın amacı Borsa İstanbul’da etkin piyasalar hipotezinin geçerliliğini ampirik olarak araştırmaktır. Bu amaçla 1988 ile 2014 yılları arasında BİST100 ve BİST30 endeksleri için günlük kapanış verileri kullanılarak getiri serileri oluşturulmuş ve getiri serilerinin koşullu varyansında uzun hafızanın varlığı Baillie ve Morana (2009) tarafından geliştirilen Uyarlanabilir (Adaptive)-FIGARCH (A-FIGARCH) model ile araştırılmıştır. Analiz sonucunda, endeks getirilerinin varyansında çok sayıda yapısal kırılma noktası bulunmuş ve A-FIGARCH modelin getiri serilerini tahmin etmede daha üstün sonuçlar verdiği belirlenmiştir. Ayrıca, getiri serilerinin koşullu varyansının uzun hafıza özelliği gösterdiği ve buna bağlı olarak Borsa İstanbul’un zayıf formda etkin olmadığı sonucuna ulaşılmıştır.The aim of this paper is to examine validity of the efficient market hypothesis in Borsa İstanbul. Daily returns series are calculated by using daily closing price for BİST100 and BİST30 indices for periods of 1988-2014 and the presence of long memory on the volatility of the returns series is examined by means of Adaptive-FIGARCH (A-FIGARCH) model proposed by Baillie and Morana (2009). Empirical results suggest that there are multiple structural breaks on variance of returns series and A-FIGARCH model outperforms. In addition, it is found evidence in favor of long memory on the conditional variance of returns series and hence it can be said that Borsa İstanbul is not weak form efficient market

Volatilitede uzun hafıza ve yapısal kırılma: Borsa Istanbul örneği

The aim of this paper is to examine validity of the efficient market hypothesis in Borsa İstanbul. Daily returns series are calculated by using daily closing price for BİST100 and BİST30 indices for periods of 1988-2014 and the presence of long memory on the volatility of the returns series is examined by means of Adaptive-FIGARCH (A-FIGARCH) model proposed by Baillie and Morana (2009). Empirical results suggest that there are multiple structural breaks on variance of returns series and A-FIGARCH model outperforms. In addition, it is found evidence in favor of long memory on the conditional variance of returns series and hence it can be said that Borsa İstanbul is not weak form efficient market

THE VALIDITY AND RELIABILITY STUDY OF THE TURKISH VERSION OF PARENT EMOTION REGULATION SCALE

The purpose of this study is to adapt Parent Emotion Regulation Scale to Turkish. Original scale was developed by Pereira et. al. (2017) in order to evaluate regulation of negative emotions in parenting context. In the present study, after linguistic equivalance examined, the form was applied to 311 fathers and mothers of 3 to 15 year-old children. Internal consistency was assessed by Cronbach’s alpha and split half methods with adequete internal consistency. Confirmatory factor analysis showed a three-factor structure with good fit. Overall our results provide evidence that the PERS-T migt be a promising tool for the assessment parent emotion regulation in the Turkish context.  Article visualizations

Squatting Facet: A Case Study Dilkaya and Van-Kalesi Populations in Eastern Turkey

Anomalies of the skeleton provide information on living conditions, cultural structure and health problems in ancient societies. Squatting facet is a kind of anomaly that forms on the surfaces where the tibia and talus articulate is the squatting facet states the daily activities and living style of the society. The aim of this study is to learn the daily activities of the medieval societies in the Van region through studying of squatting facets. In this study, adult skeletons from Dilkaya and Van Kalesi-Eski Van Şehri societies dating to the Medieval Age were investigated (65 tibia and 82 tali from Dilkaya, 61 tibia and 52 tali from Van Kalesi-Eski Van Şehri). The lateral squatting facet had high ratios in both societies. The tibia lateral squatting facet found on females and males of Dilkaya was 97.2% and 96.9%, respectively, and on females and males of Van kalesi Eski Van Şehri was 87.5% and 89.2 %, respectively. The talus lateral squatting facet found on females and males of Dilkaya was 72.1% and 51.3%, respectively, and on females and males of Van kalesi Eski Van Şehri was 91.2% and 83.7%, respectively. The results provide an opportunity to study the relationship between past and modern population, and also describe the daily activity of life and cultural structure

2023'e Doğru Türkiye'de Üniversite Kütüphaneleri : Mevcut Durum, Sorunlar, Standartlar ve Çözüm Önerileri

Çağın gereklerine uygun ve dünya ile rekabet edebilir bir eğitim, öğretim ve araştırma altyapısı için üniversitelerin en azından kendi alanlarında üretilen bilgiye erişebilecek ve bu bilgiyi 7/24 kullanıcıların hizmetine sunabilecek altyapıya sahip olmaları gerekir. Bu altyapıdan yoksun bir üniversitede dünyanın bilgi ve deneyiminden yeterince yararlanılamadığı ve hatta daha önce üretilmiş bilgi ve deneyimleri tekrar üretmek üzere gereksiz yere zaman ve para harcadığı ileri sürülebilir. Oysa dünyadaki söz sahibi üniversitelere bakıldığında, bu üniversitelerin kütüphanelerine ciddi yatırımlar yaptıkları ve bu yatırımların sürüdürülebilir olması için gerekli önlemleri aldıkları görülür

Muhammad Mustafa Al-A‘zamî’s Joseph Schacht Criticism And Its Effects on Turkish Academy

Orientalism is one of the most popular topics in Islamic sciences, especially in the field of ḥadīth. Although the views of orientalists have started to be mentioned recently, it is seen that they have in fact influenced Islamic sciences indirectly or directly for a long time. The reason for the increase in the influence of orientalism in the field of ḥadīth is mainly the authors such as Goldziher, Juynboll and Schacht who have heavy critics about ḥadīths and become popular among both orientalists and Muslim world. One of the first people to follow orientalism studies in the field of ḥadīth from the Islamic world must have been Muhammad Mustafa al-A‘zamî. A‘zamî studied the works of both Goldziher and Schacht, especially in the field of ḥadīth, and tried to comment on them and refute their theories. A‘zamî’s opinions are important that they are used in most books by Turkish academicians. Although the number of studies related to orientalism in the field of ḥadīth in the Turkish academy seems to be low, in fact there have been very high-quality articles and books. However, we can say that there has not been enough work in the field due to various reasons, as the language problem. In this study, firstly, a short presentation about orientalism will be given. A‘zamî's views in this field will be mentioned after this part. His opinions on orientalists, especially Schacht, and his criticisms and the methods he followed in his work will be tried to be shown. Then, brief summaries of all books we could find directly on ḥadīth and orientalism in Turkish academy will be presented. On this part a general view can be obtained about the perspective of the Turkish academy on orientalists and A‘zamî’s effects on the field

Reasons of Decomposition Observed in Sandstones Used in The Historical Edirne Station Building

Tarihi Edirne Gar Binası, Edirne’nin Karaağaç semtinde bulunmaktadır. Meriç ve Tunca nehirleri üzerindeki köprülerden geçen düz bir yolla Edirne’ye bağlanmaktadır. Bina, Mimar Kemalettin Bey tarafından gar binası olarak tasarlanmıştır. Edirne Garı, 1977 yılında yeni kurulan Edirne Mühendislik ve Mimarlık Akademisi’ne verilmiştir. Günümüzde, Trakya Üniversitesi tarafından kullanılmaktadır. Gar binasında büyük holün yer aldığı orta bölümün dış duvarları, pencere ve kapı kemerleriyle silmeler, girişteki kulelerin üst bölümleri ve kemer duvarları kumtaşından yapılmıştır. Binada kullanılan kumtaşlarında zaman içerisinde bozulmaların meydana geldiği tespit edilmiştir. Yapılan araştırmada kumtaşlarındaki bu bozulmaların sebepleri belirlenmeye çalışılmıştır. Bu nedenle, kumtaşlarının kimyasal analizi yapılmış, petrografik ve mineralojik özellikleri belirlenmeye çalışılmıştır. Yapılan bu çalışmayla, gelecekte yapılacak olan restorasyon çalışmalarına yardımcı olmak hedeflenmiştir.The Historical Edirne Station Building is in Karaağaç district of Edirne. It is connected to Edirne through a straight road passing over the bridges over the rivers Meriç and Tunca. The building was designed as a station premises by Architect Kemalettin Bey. Edirne Station was given to newly established Edirne Engineering and Architecture Academy in 1977. Today, it is used by Trakya University. In the station building, the exterior walls of the middle section where the big hall is located, door and window arches and moldings, upper parts of the towers on the entrance and the arch walls are made of sandstones. It is detected that decompositions took place in the sandstones used in the building over time. It has been tried to determine the reasons of these decompositions in the sandstones in the research conducted. For that reason, chemical analyses were done on the sandstones and it has been tried to determine the petrographical and mineralogical characteristics of it. The research aimed to shed light on the restoration works to be carried out in the coming years

Adjuvant use of liquid alginate suspension for post-tonsillectomy morbidity: Double-blind randomized clinical trial of efficacy

Objective: To evaluate the efficacy of liquid alginate suspension in alleviating post-tonsillectomy morbidity in adult patients. Methods: A prospective, double-blind, randomized, placebo-controlled study comparing the effect of liquid alginate suspension with placebo was performed on 40 patients who underwent tonsillectomy at Derince State Hospital, Kocaeli, Turkey. The patients were randomly chosen, and each used liquid alginate suspension four times daily or a placebo solution at the same regimen. Tonsillectomy was performed under general anesthesia by cold dissection and suture ligation. Patients were examined at postoperative days 1, 3, 5, and 7 for healing, instructed to note the amount of analgesics used, and asked to mark the visual analog score of throat pain every day for a week. Results: The study group had statistically significant lower pain scores at day 2 (P = 0.03). Study group required less analgesic than the control group during the study period, but the difference was statistically different only on day 2 (P = 0.003) day. Healing was statistically significant on day 5 (P = 0.03) in the study group. Conclusion: Use of the antireflux suspensions in patients undergoing tonsillectomy may be effective in reducing postoperative morbidity in adjunct with classic analgesics. © 2009 American Academy of Otolaryngology-Head and Neck Surgery Foundation

Green Reduction of Graphene Oxide Coated Polyamide Fabric Using Carob Extract

A green reduction processes for graphene oxide using carob extract is reported in this work. In this study, graphene oxide (GO) nanosheets were synthesized using the improved Hummer's method and applied to polyamide fabric thorough the simple dip coating method, Then, the graphene oxide was reduced with a chemical reduction process using carob extract as a green reducing agent to give the reduced graphene oxide (RGO) material. The reduction time was studied. The structure, morphology, and thermal behavior of the material was characterized by X ray diffraction (XRD), scanning electron microscopy (SEM), and thermogravimetric analysis (TGA), respectively. The electrical resistivity results clearly revealed that the GO coated polyamide fabric was successfully converted to the RGO coated polyamide fabric with the effective elimination of oxygen containing functional groups