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  • MakaleYalnız künye2014
    Biyokütle enerjisi potansiyeli ve ekonomik etkileri: TRA1 Bölgesi üzerine bir saha araştırması

    Yaprakli, Sevda; Bayramoglu, Turgut

    Bu çalışmanın amacı TRA1 Bölgesi’nde (Erzurum-Erzincan-Bayburt) Biyokütle Enerjisi (BE) potansiyelini ve ekonomik etkilerini tespit etmektir. Bu amaçla 2013 yılı için TRA1 Bölgesi’nde 952 anket formu kullanılarak bir saha araştırması yapılmış ve elde edilen veriler istatistiki analizlere tabi tutulmuştur. Analiz sonuçlarına göre TRA1 Bölgesi’nde hayvansal ve bitkisel kaynaklı toplam ekonomik BE potansiyeli 4,778 Ton Eşdeğeri Petrol-TEP’tir. BE’nin % 56’sı Erzurum’da, % 27,2’si Erzincan’da ve % 16,8’i Bayburt’ta üretilebilecek düzeydedir. Ayrıca TRA1 Bölgesi’nde BE üretiminin yerel ekonomi üzerindeki en önemli üç etkisinin; ilave gelir artışı, istihdam artışı ve toprak verimliliğinin artması şeklinde olacağı belirlenmiştir. Sonuç olarak, TRA1 Bölgesi’nde BE potansiyelinin varolduğu ve bu potansiyele uygun BE üretiminin yerel ekonomiye olumlu katkıda bulunacağı tespit edilmiştir.

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  • MakaleYalnız künye2014
    Postmodernizm ve eğitim

    Bayram, Bora; Kılıç, Latife Kırbaşoğlu

    Son yıllarda modernizmin eleştirisiyle adını sıkça duyduğumuz bir söylem dikkatleri üzerine çekmektedir: postmodernizm. Sanayi sonrası toplumların var oluş sürecinin doğurduğu bu kavram, eleştirisi ve vadettikleriyle hayli iddialı bir perspektif çizmektedir. Özgürlük, eşitlik ve adalet kavramlarına yeni bir bakış kazandıran postmodern tavır, sanattan sosyolojiye dek yankılarını çok çeşitli alanlarda hissedebileceğimiz yeniliklerle yüklü şekilde hayatımıza girmiştir. Postmodernizmin şüphesiz eğitim üzerine de etkisi olmuştur. Buna göre öğrenciyi bir birey olarak merkeze alıp öğretmenin rehber olarak öne çıktığı yeni bir ortam tasavvur edilmiştir. Öğrencinin kendi öğrenmelerini kendinin yapılandırması, okullarınsa seçime dayalı alternatif konular sunması ortaya atılan en önemli yenilikler olarak dikkat çekmektedir. Postmodern yaklaşımın eğitim sürecine dâhil edilmesiyle eğitimli insanın algısı da değişmiştir. Temel alanlarda sağlanan öğrenmelerin eğitimli birey için artık yeterli olarak görülmediği yeni bir yaklaşımın kapılarının aralandığı bu süreçte eğitimli birey, kitle iletişim araçlarının etkili şekilde kullanımına vakıf niteliklere sahip olmalıdır. Bu bağlamda bireyin yeteneklerine göre en iddialı olduğu alanlarda eğitim yapılması gerekliliği öğretim yöntemlerinde de ciddi bir sorgulamayı gerekli kılmıştır. Çalışmamızda bu gereklilikler çerçevesinde postmodernizm kavramı ve onun eğitimle ilişkisi irdelenmiştir.

    AtıfTR Dizin5
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  • MakaleYalnız künye2014
    Expectation Scale for Mathematical Applications Course: A Study on Validity and Reliability

    Doruk, Muhammet; Öztürk, Mesut; Kaplan, Abdullah

    This study aims to develop a measurement tool with high validity and reliability in order to reveal what secondary school students expect of mathematical applications course. For this purpose, researchers developed an Expectation Scale for Mathematical Applications Course on 5 point Likert scale with 29 items and three factors. The scale was applied on a total of 405 fifth- and sixth-graders to take mathematical applications course at state secondary schools in a medium sized city of north east of Turkey. Exploratory factor analysis is used to determine the structural validity of the scale. Reliability analysis concluded that reliability coefficient (Cronbach alpha) of the scale is .93. Reliability coefficients of three factors obtained from the scale vary between .81 and .94 explaining 60% of the total variance of the scale. According to these values, we can say that the developed scale is a data collection tool with high validity, reliability and variance explanatoriness.

    AtıfTR Dizin3
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  • MakaleYalnız künye2014
    Üretim İşletmelerinde Firma Karlılığının Finansal Belirleyicileri ve BİST İmalat Sanayi Uygulaması

    Karaca, Süleyman Serdar; Korkmaz, Özge

    Firmaların karlılık düzeylerini etkileyen faktörlerin saptanması ekonominin verimliliğinin ve etkinliğinin belirlenmesinde büyük önem taşımaktadır. Bu çalışma, firmaların karlılık düzeylerinin açıklanmasında, finansal göstergelerinin anlamlılığını ve finansal göstergeler ile karlılık değişkenleri arasındaki ilişkilerin ortaya konulmasını amaçlamaktadır. Analizde, İmalat Sanayi Endeksinde yer alan 78 adet firma kullanılmış ve 2000-2011 yılları arasındaki finansal oranlar yıllık olarak ele alınmıştır. Çalışmada, değişkenler arasındaki ilişkiyi ölçmek amacıyla panel regresyon modellerinden yararlanılmış ve 3 ayrı model elde edilmiştir. Modellerde, Hisse Başına Kazanç (HBK), Net Kar / Öz Sermaye (NK/OS) ve Net Kar / Toplam Aktif (NK/TA) bağımlı değişken, Net Satış / Toplam Aktif (NS/TA), Satılan Mamul Maliyet / Stoklar (SMM/STK), Net Satışlar / Ticari Alacaklar (NS/TİCA), Cari Oran (CO), Duran Varlık / Toplam Aktif (DV/TA), Maddi Duran Varlık / Uzun Vadeli Yabancı Kaynak (MDV/UVYK), Net Satışlar / Dönen Varlıklar (NS/DV) ve Toplam Borç / Toplam Aktif (TB/TA) bağımsız değişken olarak kullanılmıştır. Sonuç olarak, analiz edilen her üç modeli TB/TA, DV/TA, MDV/UVYK değişkenleri istatistiki olarak açıklarken, Model 2 ve Model 3 için ise sadece NS/DV değişkenin istatistiki olarak açıkladığı gözlenmiştir.

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  • MakaleYalnız künye2014
    Çoklu kırınımlar içeren senaryolar için elektromanyetik dalga yayılım modelleri

    Tabakcıoğlu, Mehmet Barış; Cansiz, Ahmet

    Dijital yayın sistemlerinde daha güvenilir yayın yapmak için kapsama alanı ve alıcı üzerindeki alan şiddetinin kestiriminde yayılım modelleri kullanılmaktadır. Yayılım modelleri temelde nümerik ve ışın izleme tekniğine dayanan modeller olmak üzere iki ana grupta incelenebilir. Elektromanyetik dalga yayılım modellerinde hesaplama zamanı ve kestirilen alan şiddetinin kesinliği arasında bir ödünleşme vardır. Nümerik modeller kesin sonuçlar vermesine karşın, hesaplama zamanı yüksektir, ışın izleme tekniğine dayanan modeller ise kesinliği az olmakla beraber hesaplama zamanı düşüktür. Hesaplama zamanı ve kesinlik açısından optimum olan modellere ihtiyaç duyulmuştur. Bunun için birçok model geliştirilmiştir.

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  • MakaleYalnız künye2014
    Hayriyye-i nâbi, lutfiyye ve telemak aynı yüzyılların farklı kültürlerinden çocuklara ortak nasihatler

    Erbay, Nazire

    Millî değerlerini bilmeyen, evrensel bazı kabullerden habersiz, bilimden uzak nesillerin kendi milletine hatta insanlığa tehlikeli olacağı düşüncesiyle çocukları ve gençleri eğitme işi, sadece devlete ait bir görev değil, aynı zamanda sanatçılar tarafından da yüzyıllardır vazife olarak görülmüştür. Günümüzde ,,global ahlak ilkeleri"nin varlığı bazı değerlerin evrenselliğini, bu değerlerin yüzyıllardır değişmeden kaldığını gösterir. Varlığı kabul edilen bu değerlerin önemi edebi ve dini eserlerin incelenmesiyle bir kez daha açığa çıkmaktadır. Bireyin, toplumun mutlu yaşaması için dünyevi kıymetlerin, fiziksel güzelliğin, paranın, insanlar arasındaki ırk ayırımının, sosyal konumun bir tarafa bırakması gerektiği nasihat içeren eserlerde vurgulanmaktadır. Ayrıca devlet yöneticisinin toplumsal barışı, huzuru yakalayabilmesi aynı şekilde bazı ahlaki değerlerinin iktidarı boyunca söz konusu olması gerekmektedir. 17. yüzyılın hikemî üsluptaki ismi Nâbi Hayriyye"yi, Sümbülzâde Vehbi Lutfiyye"yi oğullarına nasihat etmek maksadıyla yazarlar. Batı medeniyetine ait Telemak da Nâbi"nin eseriyle aynı yüzyılda Fenelon tarafından kaleme alınır. Eser, hocası Mentor tarafından eğitime tabi tutulan Telemak"ın maceralarını anlatır. Eser; eğitici, nasihat verici, çocuğu hayata hazırlayıcı özellikleriyle dikkat çeker. Bu çalışmada çocuklara ve gençlere nasihatler veren klasik Türk edebiyatının önemli iki eseri Nâbi"nin Hayriyye"si ile Sümbülzâde Vehbi"nin Lutfiyye"si Batı kültürünün birçok değerini yansıtan Telemak"la benzer içerikteki nasihatleriyle değerlendirilecektir. Çalışmada, aynı yüzyıllarda, farklı coğrafyalardaki benzer siyasi karışıklıkların içinde yazılan Nâbi"nin ve Fenelon"un eserlerine ,,özellikle" dikkat çekilecektir.

    AtıfTR Dizin2
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  • MakaleYalnız künye2014
    The Obligatory Alms of Risky Debts and Setting off Debts to Obligatory Alms

    Şen, Yusuf

    Trade relations are the indispensable elements of human life. Being a debtee in these relations is an inevitable issue. The subject of debts arise from trade relations or lending has great importance in terms of giving alms to the holders of right, that is one of the bases of Islam. Not all the main criteria necessary for giving alms are not necessary for the alms of debts. There isn't a complete ownership, alias quality for debts and this circumstance makes the alms of debts disputable. Moreover, is it possible to set off the debts to obligatory alms? In this essay, alms of risky debts will be explained with regards to debt and debtee within the context of general obligatory alms criteria and the subject of setting off debts to alms will be dwelle on

    AtıfTR Dizin3
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  • MakaleYalnız künye2014
    2008 Global Economic Crisis and the Caucasus-Central Asia Turkish Diaspora

    Durmaz, Atakan; Kalça, Adem

    The economic crisis that started in the US and shook the whole world has affected all economies in some degree. The Central-Asian and Caucasian countries newly arising at world scene and having problems in developing and making use of the wealth they own have got their share of the crises. The economic crises, in addition to the structural (economic, social, political etc.) problems of the region, have had negative effects on the recent growth trend. However, the strongest effect of the crises has been on the Diasporas of the countries in the region. The exchanges from Diasporas take an importance place in the GNPs of the region's countries except from Kazakhstan. After all, the loss of income and job has disrupted Diaspora sources highly by the effect of the crises on the countries containing their Diasporas. During the period in which the crises mostly took its affect, especially Russia and Kazakhstan have imposed some sanctions over the migrant workers within their domestic policy. These sanctions have caused the Diaspora to have great income loss. Also, many migrants have been forced to turn back to their home countries, and this has led the already existing unemployment of those countries to rise up. The aim of this study is to present the extent to which the countries in the region are affected by this period and to state the precautions to be taken for the future in the scope of the crisis's effect on the Diaspora.

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  • MakaleYalnız künye2014
    Story analysis with reference to semantic analysing of sabahattin ali’s story “duvar”

    Akpinar, Ahmet

    There exists understanding, explanation and agreement at the center of every type of human activity. Language is not a system randomly coming together to pass our thoughts to others, it is a string based on words each one of which was born with the principle of causality. Language is a system including words that connect to each other and to other things to provide communication and its intention is to provide on the one hand a message and on the other a set of signs or symbols. Ferdinand de Saussure is famous for his sign language and this system is evaluated as the relationship between ‘signifier ou signifiant’ or ‘signified or signifier’. Linguistics is the scientific research of language. Semantics, however, is a subdivision of linguistics, which investigates the meaning of the language. Semantics is not interested in the meaning of semantic phrases but rather it thematizes the meaning of sentences and underlines changes in meaning and relationships between signifier and signified. In semantics, the meaning is not what is said but what is understand. It examines the part of the signified of a sign both diachronically and simultaneously. According to Guiraud (1999), a word with no meaning has its uses. The meaning of a word depends on the relation to the other words within the same context. This view stems from Saussure’s “value” notion which is the result of the relation build between sign and the other formats in the language. According to Saussure (1998), everything becomes meaningful as a whole. In language, there is no individual element but only dissention. When our perception contrasts and comprehends the outside world, it begins to make shapes and to make sense to us. In this study, Sabahattin Ali’s story “Duvar” in which he frequently refers to the notion of “Freedom” is examined utilizing Semiotics. Considering semantics, meaning fields as denotation, connotation, semantic analysis, antonym, hyponymy and homonymy are emphasized. Also, the elements of person, place and time of the story are showed in text level

    AtıfTR Dizin1
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  • MakaleYalnız künye2014
    Effect of language and literature on individiuals and society during war atmosphere: a textbook example

    Bulut, Mesut

    The wars broke out after the Balkan War and immediately after it left deep scars in the memory of Turkish nation. These war years when thousands of Muslim Turkish people were slaughtered were called “disaster years” and they were printed in history as disgrace because these conflict years were full of real life stories which were painful and miserable. For example, cross was drawn on their foreheads without considering whether they are children or not, religious men were hanged from their turbans, and innocent girls were dragged along and exposed to any kind of cruelty. During this period, such disadvantages as an enormous empire and her remaining balance facing extinction due to the conspiracies of European states and emergence of treachery from everywhere caused sorrow and despair on Muslim Turkish nation and therefore, various movements of ideas were introduced; however, they did not yield results and anywhere in the motherland was occupied and tyrannized. In such an atmosphere, many patriotic intellectuals and writers who chose ideology of Turkish nationalism as their motto made an effort to bring educational aspect of language and literature into the forefront. For that purpose, they performed tasks to increase the motivation and morale of Turkish nation. Specifically, Young Pens (Genç Kalemler) which was begun in the city of Thessalonica in 1911 by the three writers who were most representative of the movement: Ziya Gökalp , Ömer Seyfettin, and Ali Canip Yöntem, had many fans as a result of the Balkan wars and had a very important role for the Turkism to gain strength. With New Language Movement " (Turkish: "Yeni Lisan"), they pointed out that language must be simplified, the effects of foreign language and rules on Turkish must be removed and the differences between the oral language and the written language must be removed. Therefore, this language and literature movement aimed at unity and nationalization in language. In this period, many nationalistic intellectuals and writers such as Ömer Seyfettin, Ali Canip Yöntem, Ziya Gökalp and M. Fuad Köprülü used language and literature as a means of education to educate and raise the awareness of the society. Moreover, they were not indifferent to the conditions of the country; on the contrary, examples of patriotism were actively exhibited, and remedies were searched for the liberation of the Turkish nation. For that purpose, national sensitivity was mentioned extensively primarily in Tasvir-i Efkâr (Picture of Ideas) newspaper, such magazines as Türk Yurdu, Türk Ocağı and Türk Derneği and in the TurkishLiterature textbooks written for the courses which were going to be taught in schools belonging to Maarif Nezareti (Ministry of National Education) and it was the aim to wake up people from “dreaming” and to raise their awareness. In this sense, language and literature was used as a means with the pens of intellectuals and writers in the war of independence during the Balkan wars and afterwards. The aim of the study was to detect and evaluate for what purposes language and literature was used as educational means during the war atmosphere in the Balkan Wars and afterwards . For that purpose, the example texts in Turkish-Literature textbook called Millî Kıraat (Fifth Part) by M. Fuad Köprülü for the 8th grades in primary education and the 9th grades in secondary education in Ottoman Period were used. This study was carried out via document analysis, one of the qualitative research methods. The study shed light on the history, the attention was drawn on the roles and functions of literary texts in language and literature education and it aimed at making contributions to the future studies

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  • MakaleYalnız künye2014
    Studies by ataturk to simplify turkish and an evaluation of discussions on language in this context

    Bulut, Mesut

    Every society and nation has leaders who they value and respect. These leaders were engraved on the community's memory and they are unique people who sacrificed themselves for the sake of their country's and nation's welfare and happiness. Churchill for England, Washington for the USA, Napoleon for France, Gandhi for India are considered as important leaders for their nation and historical personage. Ataturk's position and historical personage are very different for Turkish nation and oppressed nations. Ataturk is not a one dimensional leader. Ataturk, with his revolutions, founded a new nation and beyond being a historical personage, he is one of the rare leaders who had many qualities such as being a citizen, soldier and an intellectual. The life of Ataturk has become a subject of thousands of research not only in Turkey but also in many countries in the world and his life has been studied as a course. Language is the primary value which Ataturk placed emphasis on. Language can be defined as the common value and life philosophy of a nation. Language is undoubtedly the most important means to provide solidarity and unity in a country. A common language spoken by the individuals who constitute the nation is the most important element which makes a nation. Language, the most important indicator of national conscience, is the symbol of bearing the trace of a nation which an individual belongs to. For a nation to evoke the sense of existence socially there is a bond between the way of thinking and feelings, history, language, and culture. At this point, because Ataturk especially believed that the foundations of the new Republic would be actualized by establishing an understanding of national language, he initially preferred to solve the problems of Turkish, an educational and official language. For that purpose, he actualized Language Reform, and he placed emphasis on simplification /nativisation of Turkish. Turkish Language Association was founded for that purpose and Ataturk wanted these problems to be solved. This study aimed at exploring the nativisation/ simplification studies carried out for Turkish from Republic period to today by means of presenting Ataturk's point of view and evaluations were made about the studies which were carried out for the purpose of nativisation/ simplification of Turkish and its becoming a language of science and education and discussions on Turkish language such as liquidationism, fabrication, Ottoman Turkish, language fascism, pure Turkish (Turkish made up largely of words that are etymologically Turkish), and it also aimed at solutions were suggested on current problems of Turkish.

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  • MakaleYalnız künye2014
    Effects of contradictions in terms in teaching grammar on teaching turkish

    Bulut, Mesut

    Grammar is the set of structural rules governing the composition of clauses, phrases, and words in any given natural language. The term refers also to the study of such rules, and this field includes morphology, syntax, and phonology, often complemented by phonetics, semantics, and pragmatics. Undoubtedly, language is the primary element that makes a society and a nation. The unity of language is crucial because it is the primary element that what makes a nation. Therefore, language education is a subject which every nation must lay emphasis on and pay attention to. It is an undeniable fact that as a nation there are some problems in the development of our language. Teaching grammar is the description and explanation process of grammar meaningfully within the framework of set of rules. Thus, instruction of grammar structures which compose the main structure of a language is a condition which must be approached delicately. It is a fact that while teaching Turkish grammar, contradictions in terms are experienced due to some problems. Because the course contents identified by Council of Higher Education (YÖK) and teachers and preservice teachers raised according to different academic perspectives encountered differences in the curriculum of Ministry of National Education (MEB), being in a dilemma, they are asked to forget a set of knowledge implementation…being exposed to such expressions as “Here is not a university ...” It is possible to evaluate such approaches encountered in teaching grammar as the first reflections of contradictions in terms. Of course, there will be different approaches to grammar, but if different approaches begin to threaten the unity of language, it becomes very important to approach this subject carefully. This study discussed the reflections of contradictions in terms in teaching Turkish grammar on language and the answer to the question what problems such contradictions in terms caused about the unity in language was sought. It was found in the study that contradictions in terms in teaching grammar triggered instability in language; therefore, it was concluded that all educators and linguistics should give some thought to this subject and seek ways to solve the problem. A set of evaluations were made about some contradiction based problems with this study and solutions were suggested for these problems

    AtıfTR Dizin8
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  • MakaleYalnız künye2014
    Impact of brain-based learning approach on turkish education

    Bulut, Mesut

    In today’s information age, it is easier to have access to information but it is also difficult because individuals deal with many things at the same time with information technology. Therefore, the individual cannot focus on learning activity physiologically and psychologically. Undoubtedly, this condition has a negative effect on the individuals’ education-teaching. In this regard learning psychology is an important point with regard to student and teacher and it must be the subject of the studies. Therefore, education-teaching programs must be prepared and implemented in accordance with the necessities of the time. Turkish education program, its content, and teacher and student to implement this program gain importance. Language teaching has an important place among the education-teaching activities and individuals’ expressing themselves, having a reputable position, having a good career, adapting to the changing world order and promoting cultural transfer can be accomplished with a good language education and teaching. In this regard brain based language teaching and learning is an important topic which each nation or state takes very seriously. Education and teaching programs change continuously in the changing and globalising world. These changes are also felt in Turkish education because language is the most important factor which supports a society and a nation and maintains its existence. There are many problems about Turkish teaching, the language which we speak and write. The research was carried out with survey model. Various evaluations were made about Turkish education and Turkish teaching, various results were obtained, and some suggestions were made within the framework of brain-based learning approach in the research. The relation between the brain-based learning approach and Turkish teaching were taken into consideration during the solutions for the problems related to Turkish teaching. The aim of the study, which was carried out to examine the reflections of brain-based learning on Turkish with reference to Turkish education and Turkish teaching, is to make contributions to Turkish and the studies to be conducted about this topic

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  • MakaleYalnız künye2014
    Kelime öğretiminde grafik düzenleyicileri (frayer modeli örneği)

    İlter, İlhan

    Kelime dağarcığı, temelinde bilgiye dayalı sözcükler, terimler ve kavramlar bilgisi olup; aslında insan bilincinin bir evrenidir (Vygotsky, 1986). Bu açıdan kelime kazanımı ve gelişimi, bireyin akademik, sosyal ve kültürel gelişiminin, kısacası profesyonel yaşamın gerekli bir parçasıdır. Zengin kelime bilgisi, eğitimsel deneyimlerin tüm içerik bölgelerini etkiler ve özellikle iletişimin bütün bölümlerinde etkin bir rol oynar. Kelime öğretiminde bir grafik düzenleyici olan Frayer modeli, sosyal ve bilişsel yapılandırmacı öğrenme kuramını temel alarak öğrenci öğrenmesini destekler; bu nedenle model, başarılı kelime öğretiminin tüm bileşenlerine fazlasıyla sahiptir. Nitekim bu tip bir düzenleyici kullanmanın en büyük avantajlarından biri de, öğrencilerin yeni bilgiyi şemalarında bulunan ön bilgi ve yaşantılarına bağlamasıdır. Şema teorisine göre, bir kişi zihinde daha önce depoladığı bilgiyle yeni bilgi arasında anlamlı bir bağ kuramadığı sürece yeni bilgiyi öğrenemez. Dolayısıyla Frayer modeli, öğrencilerin kelimeleri uzun süreli belleğe kaydetmesini amaçlayan bilgi işlem sürecine dayalı bir strateji olup; kelimelere yeni anlamlar kazandırarak semantik haritalar oluşturmasına yardımcı olur. Ayrıca Frayer modeli, öğrencilerin anahtar kelimeye ilişkin tanımını ve temel özelliklerini açıklamalarına, örnek olan ve örnek olmayan kavramları belirlemelerine, böylece kendi anlamlarını geliştirmelerine katkı sağlar. Bu araştırmanın amacı, Frayer modelinin özelliklerini açıklamak ve modele yönelik Sosyal bilgiler, Matematik ve Fen ve Teknoloji dersleri bağlamında örnek etkinlikler sunmaktır. Araştırmada, nitel araştırma yöntemlerinden biri olan 'doküman incelemesi' yöntemi kullanılmıştır. Sonuç olarak modelin kullanımının kavramsal algı zorluğu çeken öğrenciler ya da zayıf okuyucular üzerinde olumlu etkiler yaratması, soyut ve karmaşık kelimelerin öğretiminde ya da öğrencinin öğrenmesine engel olduğu herhangi bir kavram bölgesinde kullanılarak anlamlı öğrenmeyi gerçekleştirmesi açısından öğrenme ortamında etkili olacağı önerilmektedir

    AtıfTR Dizin8
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  • MakaleAçık Erişim2014
    DETERMINATION OF THE WEAR FAULT IN SPUR GEAR SYSTEM USING STATISTICAL PROCESS CONTROL METHOD

    Maras, Sinan; Arslan, Hakan

    Vibration analysis is one of the early warning methods widely used in obtaining information about faults occurring on the machine elements and structures. In this method, gear fault detection can be performed by analyzing of the vibration test results using signal processing, artificial intelligence and statistical analysis methods. The objective of this study is detection the existence of wear by examining changes in the vibrations of spur gears due to wear faults in statistical process control carts. In this study, artificial wear was created on the surfaces of spur gears in order to be examined in gears test rig. Then, these gears were attached and vibrations data were recorded by operating the system at various loading and number of cycles conditions. Detection of fault was demonstrated by analyzing undeformed and worn gears data in statistical process control carts by means of real-time experimental studies.

    AtıfWoS1OpenAlex2
    Web of Scienceİncele
  • MakaleAçık Erişim2014
    Production of pectin lyase from Geobacillus pallidus p26, purification, characterization and fruit juice application

    Çelik, Safinur Yildirim; Demir, Nazan; Demir, Yasar; Adiguzel, Ahmet; Gulluce, Medine

    A bacterial strain was isolated from Pasinler hot spring, Erzurum, Turkey. The purified thermophilic isolate was identified as Geobacillus pallidus P26 and used to produce extracellular pectin lyase (EC 4.2.2.10). Pectin lyase enzyme was purified 34 fold by using DEAE-cellulose anion exchange column chromatography and characterized. Molecular weight of the enzyme was determined as 56 kDa by using Sephadex G-100 gel filtration chromatography. Purification of enzyme was verified by SDS-PAGE. The pH- and temperature optima of enzyme were determined (pH 9.0 and 60 degrees C, respectively). Pectin lyase was mostly stable at 50 degrees C: for 24 hours. Its' activity ducruitscd to 50 % for 24 h at 60 degrees C. K-M and V-max were calculated as 24.8 mg/mL and 2.28 mu mol/L min, respectively. Purified pectin lyase was inhibited by Fe3+, Zn2+, Cu2+, Ca2+, Co2+ and Hg2+ but not by Mg2+. The purified pectin lyase enzyme was used for getting fruits juices. It was found that yields of fruits juices increased when they were compared with control.

    AtıfWoS9OpenAlex9
    Web of Scienceİncele
  • MakaleAçık Erişim2014Scopus SJRQ1
    Comparison between Analytical and ANSYS Calculations for a Receding Contact Problem

    Yaylaci, Murat; Öner, Erdal; Birinci, Ahmet

    This paper considers a receding contact problem for two elastic layers (with different elastic constants and heights) supported by two elastic quarter planes. The lower layer is supported by two elastic quarter planes, and the upper elastic layer is subjected to a symmetrical distributed load whose length is 2a on its top surface. It is assumed that contact between all surfaces is frictionless, and the effect of gravity force is neglected. First, the problem is formulated and solved using the theory of elasticity and integral transform technique. Using the integral transform technique and boundary conditions of the problem, the problem is reduced to a system of singular integral equations in which contact pressures and contact areas are unknown. The system of singular integral equations is solved numerically by using the Gauss-Jacobi integration formulation. Second, the receding contact problem has been developed based on the FEM ANSYS software. Two-dimensional analysis of the problem is carried out. The ANSYS and analytical results for the contact pressures, contact areas, and normal stresses (sigma(x) and sigma(y)) along the axis of symmetry are given for various dimensionless quantities. The ANSYS results are verified by comparison with analytical results. (C) 2014 American Society of Civil Engineers.

    AtıfWoS50OpenAlex35
    Web of Scienceİncele
  • MakaleAçık Erişim2014Scopus SJRQ2
    Assessment of kinetics, thermodynamics, and equilibrium parameters of Cu(II) adsorption onto Rosa canina seeds

    Serencam, Huseyin; Ozdes, Duygu; Duran, Celal; Senturk, Hasan Basri

    Rosa canina seeds (RCS) is considered as a low-cost and promising adsorbent in removal of metal ions; hence, in the present study, we aimed to test the adsorptive removal of Cu(II) ions from aqueous solutions by utilizing RCS in a batch process. After characterization of RCS by using several techniques, the effects of various experimental parameters such as initial pH of aqueous solution, contact time, initial Cu(II) concentration, RCS concentration, temperature, and electrolyte concentration were studied upon the adsorption process. The desorption conditions of Cu(II) ions from the loaded RCS were also evaluated. Maximum Cu(II) adsorption was found to occur at pH 6.0 and the equilibrium was established after 60 min of contact time. The adsorption isotherms were described by means of Langmuir, Freundlich, Temkin, and Dubinin Radushkevich models. The adsorption kinetics were analyzed using pseudo-first-order, pseudo-second-order, Elovich and intraparticle diffusion models and the adsorption data were well described by the pseudo-second-order model. Thermodynamic parameters such as the Gibbs free energy (ΔG), enthalpy (ΔH), and entropy (ΔS) changes were also evaluated and it has been found that the adsorption process was feasible, spontaneous, and endothermic in the temperature range of 278-313 K.

    • SDG 6 · Temiz Su ve Sanitasyon
    AtıfScopus19WoS20OpenAlex19
    ScopusWeb of Scienceİncele
  • MakaleAçık Erişim2014Scopus SJRQ2
    Two-step numerical procedure for complex permittivity retrieval of dielectric materials from reflection measurements

    Hasar, Ugur Cem; Barroso, Joaquim José; Kaya, Yunus; Ertugrul, Mehmet; Bute, Musa; Catalá-Civera, José M.

    A two-step measurement procedure has been proposed for measurement of complex permittivity of dielectric materials using one-port reflection measurements. In the procedure, as a first step, a graphical method is applied to analyze on the complex reflection-coefficient plane the general pattern of dielectric behavior of the sample. Then, as a second step, optimization algorithms are utilized for retrieving electrical properties of samples. The procedure requires measurement of complex reflection scattering parameters of at least two samples with different lengths. It has been validated by X-band measurements of three polyvinyl chloride samples with lengths 5, 10, and 20 mm.

    AtıfScopus14WoS13OpenAlex15
    ScopusWeb of Scienceİncele
  • MakaleYalnız künye2014Scopus SJRQ2
    A comparative study of selected disperse azo dye derivatives based on spectroscopic (FT-IR, NMR and UV-Vis) and nonlinear optical behaviors

    Cinar, Mehmet; Coruh, Ali; Karabacak, Mehmet

    In the present work, a combined experimental and quantum chemical study on ground state equilibrium structure, spectroscopic and nonlinear optical properties of selected disperse azo dye molecules are reported. The vibrational transitions were identified based on the recorded FT-IR spectra in the range of 4000-400 cm-1 for solid state, simulated IR spectra and total energy distribution (TED) of vibrational modes. The chemical shifts were determined from the results of observed 1H and 13C NMR spectra in chloroform and dimethylsulfoxide solution. The DFT/gauge-invariant atomic orbital (GIAO) methodology was applied to predict the magnetic properties. Electronic properties were carried out by UV-Vis spectroscopy and TD-DFT/CIS approach. The nonlinear optical (NLO) features were addressed theoretically. A detailed description of spectroscopic and NLO behaviors of studied disperse azo dyes was reported with the help of comparison of experimental measurements and theoretical calculations.

    AtıfScopus30WoS29OpenAlex29
    ScopusWeb of SciencePubMedİncele