Influences of oak utilization on the medium density fiberboard properties

Softwoods are the basic and traditional raw materials for medium-density fiberboard production. However, sustainable consumption of wood material in the production of wood-based products requires material variety. Therefore, the usability of hardwood species in the production and its effects on the board properties should be of interest. Considering this, the influence of oak utilization percentages (30 %, 50 %, 70 %, and 100 %) on the physical (density, thickness swelling-TS 2 and 24 h) and mechanical (modulus of rupture, modulus of elasticity, internal bonding, screw holding resistance, and Janka hardness) properties of medium density fiberboard was evaluated in this study. Boards were factory-made instead of laboratory-made using Quercus petraea (oak), Fagus orientalis (beech), and Pinus sylvester (Scots pine) fibers. According to the results, the modulus of rupture, modulus of elasticity, and Janka hardness values were increased when medium-density fiberboard was produced using only oak fiber. On the contrary, thickness swelling, screw-holding resistance, and internal bonding properties were decreased

Fonksiyonel Kademelendirilmiş Al-SicKompozit Malzemelerin Termal Şok Etkisi Altında Mekanik Özelliklerinin İncelenmesi

Konferans Bildirisi -- Teorik ve Uygulamalı Mekanik Türk Milli Komitesi, 2015Conference Paper -- Theoretical and Applied Mechanical Turkish National Committee, 2015Bu çalışmada balistik amaçlı geliştirilen fonksiyonel kademelendirilmiş malzemelerin (FGM) basma testi altındaki şekilsel ve mekanik davranışı inlenmiştir. Al-SiC karışımından oluşan bu malzemelerden n=0.1, n=1 ve n=10 değerlerine sahip olanlar deneysel çalışmalarda kullanılmıştır. Bu malzemelerden bir seri, direk olarak basma testine tabi tutulmuş ve bunların mekanik değerlerine ve hasar şekillerine bakılmıştır. Diğer bir seri ise 550 C’den 0 C’ye ani olarak soğutularak (termal şok), önce makro incelemeye tabi tutulmuş daha sonra yine bu numunelerede basma testi uygulanmıştır. Elde edilen sonuçlar FGM’lerin basma testi altında farklı n değerlerinde farklı yapıda şekil değiştirdiğini, termal şokların ise basma dayanımını artırıcı, şekil değiştirme kabiliyetini azaltıcı etki ortaya koyduğunu göstermektedir.In this study, structural and mechanical behavior of the functional graded materials which developed for ballistic was examined under compression test. The materials which have Al-SiC mixing and value of n=0.1, n=1 and n=10, have been used in experimental studies. A series of these pruducts were subjected to compression test directly, and these mechanical values and damage forms was examined. And the other series of macro wiev was investigate and then was applied to compression test after thermal shocking from 550 C to 0 C. The obtained results show that the functional graded materials presents different mechanical behaviour under different n value. Thermal shocks introduced the increasing affect to compression strenght and decreasing affect to shape changing ability

9th Grade Students' Learning of Designing an Incubator through Instruction Based on Engineering Design Tasks

In this study, a STEM activity was designed in which 9th-grade students can complete the task of making incubators by overcoming the difficulties they face in the engineering design process. This activity has been handled in the context of energy conversion and prepared based on the engineering design process consisting of 9 stages. The activity was applied to 34 (19 females and 15 males) 9th-grade students studying at a public school in the Eastern Black Sea Region in Turkey in the fall semester of the 2019-2020 academic year. This application took 7 lesson hours (7x40 minutes) in total. At each stage of the engineering design process, students worked like an engineer and scientists by collaboratively conducting scientific research and inquiry. Throughout the process, students were confronted with several difficulties, given the time and opportunity to help them develop STEM literacy. More importantly, the students had the opportunity to experience a STEM activity by putting the steps of the engineering design process into practice

The place and significance of Kizzuwatna in Hittite state

Dünya tarihini inceleyenler için Anadolu'nun çok özel bir yeri olduğu görülmektedir. Eskiçağ dünyasında Anadolu, her zaman yerleşilen, yurt edinilen, çevresindeki kültürlerden etkilenen ve onları etkileyen değerli bir yaşam alanı olmuştur. Anadolu, coğrafi konumu ve ekonomik yönden taşıdığı önem nedeniyle birçok uygarlığın geliştiği bir bölge olmuştur. Bu uygarlıklardan en önemlilerinden biri ve Anadolu'da ilk siyasi birliği kurmuş ve yarım asır boyunca burada hüküm sürmüş olan Hitit uygarlığıdır.Hitit Devleti, gerek diğer devletlere siyasi haklar tanıması bakımından, gerekse Hitit kralının icraatının bir meclis tarafından denetlenmesi bakımından tarihin en eski hukuk devletidir.Kizzuvatna tarihini incelediğimizde, Hitit Devleti ile eşitlik esasına dayanan birçok antlaşma yaptığı görülmektedir. Siyasi ilişkilerinin yanı sıra kültürel açıdan Hititleri oldukça etkileyen Kizzuvatna'nın, Mezopotamya kültürünü Hitit Devleti'ne aktarmış olduğunu öğrenmekteyiz. Çalışmamızda Hitit metinlerinde sözü edilen Kizzuvatna Ülkesi ile ilgili metin yerleri ve bu ülke ile ilgili bilgi veren diğer kaynaklar incelenerek bir bütün halinde sunulmaya çalışılmıştır ve Hitit Devleti için bu ülkenin önemi ortaya konulmaya çalışılmıştır.It is seen that Anatolia has an important place for the scholars who study the World History. In the ancient world, Anatolia which is not only affected by the cultures around but also affecting the cultures around, has always had a precious place. Anatolia has always been a region where many civilizations have arisen due to its geographical position and economical significance. One of the most important of these cultures is the Hittite civilization which established the first political unity in Anatolia through half a century.The Hittite State is the oldest constitutional government of history in terms of both according right to other states and the inspection of the Hittite king by a council. When analyzing the history of Kizzuwatna, it can be seen that; there are many treaties between the two governments based on the principle of equality. On the other hand, it is understood that, besides the political relations in between, Kizzuwatna had also an important impact on Hittite Culture and it transferred the Mesopotamian cultural aspects to the Hittite State.In this thesis; the land of Kizzuwatna which was metinoned in Hittite texts and the places of them tried to be analyzed and presented as a whole by using also other sources in relation to this country

The Data Representations of a Building Project: BIM Model, and IFC or IFCXML Data Standard

Building regulations in the construction industry are legal documents written in human language. These are interpreted and implemented by people and generally controlled by local governments. Traditional building regulation control and supervision methods emerge as a time-consuming and error-prone process for architects, engineers, and public authorities. Therefore, BIM\u27s effective building regulation control is considered a promising field of study in the construction industry. Automated Code Compliance Checking (ACCC) method is a rule-based method that provides simultaneous control of the computer’s building regulations. ACCC takes into account the characteristics of the building elements and related building regulations. BIM is recognized as the most effective platform for information exchange of building projects in the construction industry. It supports the development of various software. It facilitates automated or semi-automated ACCC of the building projects for compliance with building regulations and standards for the participants involved in the building production process. The data of the building project are represented in two ways in the ACCC. These are BIM Model, and IFC or IFCXML Data Standard. In this study, the BIM, IFC, and IFCXML representations of the building project data were explained over the sample housing project in the ACCC process

The impact of economic crisis on agricultural macroeconmic variables in turkey for the period of 1980-2008.

This study explores the impact of the economic crisis on the agricultural sector of Turkey. The data used covers the period of 1980-2008. This study employs some agricultural macro variables namely, gross value added of the agricultural sector, quantity index of agricultural export and import values, relative prices of agricultural goods and the reel exchange rate. The framework of the analysis is a five variables VAR model. Via this VAR model the study try to assess the impact of the economic crisis that occurred after the 1980’s on the agricultural sector of Turkey. Applying the VAR model a robust relationship is found between agricultural GDP, import, export, relative prices and exchange rates. The assessment of the effect of the economic crisis is being captured by adding a dummy variable to the model. The results show that there is no robust relationship between agricultural GDP and the indicator of the years of the (dummy) crisis. Moreover, there seems to be a positive relationship between the dummy and agricultural export and exchange rate while a negative one between import and relative prices.Economic Crisis, VAR, Agricultural Macro-Variables, Turkey

The acute effect of static stretching between sets on the number of repetitions performance in resistance training

Rest interval between sets in resistance exercises is an important variable that influence on the training volume. The purpose of the current study was to determine the effect of static stretching on the number of repetitions for three consecutive sets upper and lower body exercises. Nine trained men (age: 21,78 2,49 years; height: 171,5 4,62 cm; weight: 73,98 6,62 kg; body fat percentage: 11,1 3,95 %) completed three sets push down and leg extension exercises with 10 repetition maximum, %60 of 1 repetition maximum and %85 of 1 repetition maximum load. Participants took part static stretching and non-stretching conditions that was done on counterbalance. The results of this study demonstrated that the number of repetitions significantly decreased after static stretching for both exercises at all intensities. When compared the two conditions, the number of repetitions after static stretching on set 2 and set 3  was significantly lower than the set 1 for push down exercise at all intensities. However, for leg extension exercise at 10 repetition maximum intensity on set 2 was significantly lower than the set 1 and at %85 of 1 repetition maximum intensity on set 2 and set 3 significantly lower than the set 1. There is no significant difference for leg extension exercise between groups at %60 of 1 repetition maximum intensity. In conclusion, this study indicated that static stretching between consecutive sets has negative effect on the number of repetitions for push down and leg extension exercises. Therefore static stretching should be avoided during the rest period between sets when performing the push down and leg extension exercises

Taş yapıların cephelerindeki malzeme bozulmalarının yersel lazer tarama yöntemiyle araştırılması: Mardin Konağı örneği

Mardin Mansion is located in the protected area of the Mardin urban site. The building is a valuable building that reflects the architectural features of the traditional houses of Mardin. The aim of the study is to investigate the stone material problems of the historical Mardin mansion, which reflects the traditional housing characteristics of the province of Mardin. For this purpose, the data obtained from observational and laser scanning were combined and interpreted. As a result of the study, the most common types of material deterioration in buildings; It has been seen that there are dıscolouratıon and plants. It is thought that the intense discolouration occurring on the facades is due to the effect of increasing air pollution in the region. As a result, it is recommended to take precautions against the damages caused by air pollution on the facades of the buildings in the region.Mardin Köşkü, Mardin kentsel sit alanındaki koruma altına alınmış bölgede yer almaktadır. Yapı Mardingeleneksel evlerinin yöreye mimari özelliklerini yansıtan değerli bir yapıdır. Geleneksel konakta, çeşitlietkenlerden dolayı oluşan bozulmalar açıkça görülmektedir. Çalışmanın amacı, Mardin ili gelenekselkonut özelliklerini yansıtan tarihi Mardin konağının taş malzeme sorunlarının araştırılmasıdır. Bu amaçlagözlemsel ve lazer taramadan elde edilen veriler birleştirilerek yorumlanmıştır. Çalışma sonucundayapılarda en sık görülen malzeme bozulması türlerinin; yüzey kirliliği ve bitkilenme olduğu görülmüştür.Cephelerde meydana gelen yoğun yüzey kirliliğinin, yörede artan hava kirliliğinin etkisindenkaynaklandığı düşünülmektedir. Sonuçta, bölgedeki yapıların cephelerinde hava kirliliğinin nedenolduğu hasarlara karşı önlem alınması önerilmektedir

2-{2-[4-(4-Fluoro­phen­yl)piperazin-1-yl]-2-oxoeth­yl}-6-(morpholin-4-yl)-4-phenyl­pyridazin-3(2H)-one

In the title compound, C26H28FN5O3, the morpholine ring adopts a chair conformation. The piperazine ring is puckered [Q T = 0.5437 (15) Å, θ = 8.89 (15) and ϕ = 357.2 (11)°]. The 1,6-dihydro­pyridazine ring makes dihedral angles of 28.03 (7) and 77.46 (7)° with the phenyl and benzene rings, respectively. In the crystal, mol­ecules are linked along the c axis by C—H⋯O inter­actions and are flattened parallel to the ac plane. C–H⋯π inter­actions also contribute to the stability of the structure

Intrasellar arachnoid cyst: A case report and review of the literature

AbstractIntroductionArachnoid cysts (ACs) are frequently found on intracranial imaging studies but intrasellar arachnoid cysts are rarely encountered.Presentation of caseWe present a 49-year old patient who had headaches for 6 months and cystic sellar mass was found in his cranial imaging. We operated him by transnasal transsphenoidal route. Our intraoperative diagnosis was an arachnoid cyst and pathologic studies verified our observation. He did well postoperatively and after a 1year follow-up he was left free from future follow-ups.DiscussionAs common cystic lesions occupying the sellar region can simulate ACs both clinically and radiologically, neurosurgeon can fail to include ACs in making the initial diagnosis preoperatively.ConclusionAlthough a rare entity, arachnoid cysts should be considered in the differential diagnosis of sellar region