357 research outputs found
The effect of zinc stearate on thermal degradation of paraffin wax
Get PDFIn this research, the effects of zinc stearate addition on paraffin wax degradation were investigated by differential scanning calorimetry (DSC) and thermogravimetry (TG). The apparent activation energies of wax decomposition in nitrogen and air atmospheres were determined as 76 and 37 kJ mol-1, respectively applying Kissinger method to TG data. The degradation rate constants of paraffin containing zinc stearate (0.1-0.5%) were found to be almost two times greater than that of paraffin only in air atmosphere. However, zinc stearate did not affect the rate constants in nitrogen significantly.State Planning Organization Project 2002 K 12039
Comparison of the effects of different laryngoscope types on difficult intubation
No full textTıpta Uzmanlık TeziEndotrakeal entübasyonun anestezi pratiğinde başlıca endikasyonu genel anestezi uygulanacak hastalarda havayolu açıklığının ve güvenliğinin sağlanmasıdır. Anesteziyolojide klinik pratiklere laringoskopun girmesinden beri bütün çabalar laringoskop "blade"nin şeklini mükemmel yapmaya yöneliktir. Bunun amacı laringeal yapıların, glottisin daha iyi görülmesini sağlayarak endotrakeal entübasyonun başarı oranını artırmaktır. Laringoskopi ve endotrakeal entübasyon, larinks ve trakeanın mekanik uyarımına bağlı refleks sempatik bir yanıt oluşturarak plazma katekolamin konsantrasyonlarında artış, taşikardi, hipertansiyon, aritmiler ve özellikle kalp rezervi kısıtlı hastalarda miyokardial iskemiye sebep olabilir. Biz yaptığımız bu çalışmada, zor entübasyon olabileceği mallampati testi ile tahmin edilen hastalarda, Macintosh ve Truview EVO2TM laringoskobu; glottik görüntü kalitesi, entübasyon başarısı, entübasyon süresi, ve iki laringoskopa entübasyon sonrası gelişen hemodinamik yanıt ve komplikasyon oranları yönünden karşılaştırmayı amaçladık. Çalışmaya 18?65 yaş arasında değişen "American Society of Anesthesiologists" sınıflaması I-II dereceye giren mallampatisi III-IV olan elektif cerrahi uygulanacak 50 hasta dahil edildi. Hastalar rastgele 25'erli iki gruba ayrıldı. Grup M; Macintosh "blade"li laringoskop ile entübasyon yapılan grup, Grup T; Truview EVO2TM laringoskop ile entübasyon yapılan grup. Entübasyon esnasında tespit edilen Cormack-Lehane skoru, entübasyon süresi, entübasyon başarısı, komplikasyonlar ve Hemodinamik parametreler;Perioperatif kalp atım hızı, sistolik arter basıncı, diyastolik arter basıncı, ortalama arter basıncı, periferik oksijen satürasyonu değerleri kaydedildi. Her iki grupta glottik görüntü kalitesi karşılaştırıldığında Grubu T'de 16 (%64) olguda Cormack-Lehane skoru derece III ve IV olarak görülürken, Grup M'de 17 (%68) olguda Cormack-Lehane skoru derece III ve IV 51 olarak görüldü. Entübasyon süreleri; Grup M'de 13 sn, Grup T'de ise 27,76 sn olarak bulundu. Grup T'deki olgularda entübasyon süresi Grup M'deki olgulara göre anlamlı derecede yüksek bulundu. Entübasyon girişimi esnasında Grup M'de 6 (%24) olguda diş ve yumuşak doku hasarı oluşurken Grup T'de ise 5 (%20) olguda diş ve yumuşak doku hasarı oluştu, istatistiksel olarak anlamlı fark bulunmadı. Grup T'deki olgulara, Grup M'deki olgulara göre istatistiksel olarak anlamlı derecede daha fazla kuvvet uygulandığı bulundu. Hemodinamik parametreler açısından iki grup arasında anlamlı fark bulunmadı. Zor entübasyon düşünülen olgularda, daha iyi orafaringeal ve glottik görüntü elde ediliyor olması ve başarılı entübasyon sağlaması özellikleri ile Truview EVO2TM laringoskobun, Macintosh "blade"li laringoskop'a üstünlük sağladığı, fakat entübasyon süresi yönünden ise, Macintosh "blade"li laringoskobun Truview EVO2TM laringoskoba üstünlük sağladığı, kanısına varıldı.Anahtar kelimeler:Endotrakeal entübasyon,Macintosh "blade" laringoskop,Video-laringoskopAbstractThe principal indication of endotracheal entubation in practically anesthesia is, to provide the safety of airline of the patients under general anestesia while clinically practising anesthesiology, all the effort is for making the perfect shape of the blade. While we are trying to do that our aim is, having a best seen of the structure of larynx, glottis and redounding the success of endotracheal intubation laryngoscopy and endotracheal intubation causes the increase of catecolamine, tachycardia, hypertension, aritmia and myokardial ischemia especially on the patients with limited reserved heart diseases by forming a reflex, sympathetic response depends on mechanically stimulus of larynx and traachea. In that study, we aimed to compare the guality of view, the success of intubation, hemodynamıc responses and complication of macintosch and Trueview EVO2 TM laryngoscopes on the patients who could have diffucult intubation that we forecast by the mallampaty classification. We included 50 patients to our research between the ages of 18-65 and in the classification of American Society of Anesthesiologists 1-2 who has degree of 3-4 mallompaty score. The patients were divided into two groups randomly. The first group is group M: the group which is intubated by macintosch blade and the second group is group T: the group which is intubated with truview EVO 2 TM laryngoscope. All the parameters the Cormack-Lehane score which is evaluate by the intubation; preoperatively heart rate, systolic 53 arteriel pressure, diastolic arteriel pressure and mean arteriel pressure, peripheral oxygen saturation were recorded. When we compare the quality of wiews;in the group T on 16 patients (%64) we found the cormack-lehane score 3 and 4 and in the group M on 17 patients(%68) we found the cormack-lehane score 3 and 4.The intubation periods were 13 sec. in group M and 27,26 sec.in group T.The intubation time on group T was significally meaningfull by considering group M. While the intubation, 6 patients in group M had damaged of teeth and soft palate. By the way, in group T, 5 patients had the same damages and there was no statistically meaningful difference. we found that, there were much power applied on patients in group T than group M. There was no important difference in both groups about the hemodynamically parameters. As a result: we can say that on the cases of diffucult intubation, truview EVO2 TM laryngoscope is much beter about having a best view of glottis and having a successful intubaton than macintosch. But in added to that; group M is much beter than group T about the period of time by intubating the patients.Keywords: Endotracheal intubation, macintosch “blade”, laryngoscope, video laryngoscop
Grafik Tasarım Programı Öğrencilerinin Ders Başarı Düzeylerinin Mezun Oldukları Liselere Göre Değerlendirilmesi
No full textAyçe, Mehmet Taragay (Arel Author), Sevindik, Orhan (Arel Author)Bu çalışmada meslek yüksekokulu Grafik Tasarım programı öğrencilerinin bölüm derslerindeki başarı düzeyleri, mezun oldukları lise türleri göz önüne alınarak incelenmiştir. Çalışma, İstanbul Arel Üniversitesi Meslek Yüksekokulu Grafik Tasarım programı öğrencileri temel alınarak yapılmıştır. Yöntem olarak öğrenciler, mezun oldukları liselere göre gruplandırılmış ve üniversite eğitimlerinde seçilen derslere göre başarı durumları incelenmiştir. Veriler, çeşitli istatistik yöntemleri kullanılarak analiz edilmiştir. Grafik Tasarım programındaki dersler incelendiğinde mezun olunan derslere göre başarı düzeylerinin değişkenlik gösterdiği görülmüştür
Statistical inference on the reliability performance index for electric power generation systems
No full textIncludes bibliographical references (leaves 101-106)A primary objective of this research is to analytically develop a probability density function for the "Loss of Load, " a widely used index in power systems reliability evaluation. The equations to compute the parameters of this distribution for any given load cycle are derived. The forced outage rate (F.O.R.) for a generating unit is instrumental in the computation of reliability indices. This research also suggests a method for obtaining a statistically consistent estimator of F.O.R. using a decision theoretic approach. In order to develop the theoretical structure for the problem stated, classical and decision theoretic (Bayesian) statistical inferences are used as major tools along with the univariate and multivariate asymptotic theory. Consequently, an approximate numerical multiple integration scheme is employed to compute the parameters of the asymptotic pobability density function. The author believes that this statistical approach offers a more realistic alternative to the conventional calculation of an averaged value for the Loss of Load index where deterministic outage data are used
Fortune at the Bottom of the Pyramid: An Alternative Perspective
Get PDFThe Bottom of the Pyramid (BOP) has emerged as one of the dominant ideas in business. Cognizant of the overwhelming attention BOP has attracted and its potential impact on the billions of the poor and on managerial practices, the author analyzes the different aspects of BOP approach on how large corporations can serve low income customers profitably. An attempt is made to provide an alternate perspective on the BOP concept. I argue for the facilitation of selective consumption by the poor by avoiding their undesirable inclusion (marketing products that are not likely to enhance their wellbeing or products that are likely to be abused by them) and exclusion (not offering products that are likely to enhances their wellbeing) in target market selection decisions by the private sector organizations. A framework is presented for assessing the appropriateness of large corporations’ participation in BOP markets. I also emphasize the need to strengthen the role of the poor as a producer for rapid poverty alleviation.
Preparation and characterization of magnesium stearate, cobalt stearate, and copper stearate and their effects on poly(vinyl chloride) dehydrochlorination
No full textPreparation and characterization of pure metal soaps and investigation of their effects on poly(vinyl chloride) (PVC) dehydrochlorination were the objectives of the present study. Magnesium stearate (MgSt2), cobalt stearate (CoSt2), and copper stearate (CuSt2) were prepared by a precipitation method. An aqueous sodium stearate (NaSt) solution was mixed at 500 rpm with respective metal salt solutions at 75oC. The precipitates that formed were collected by filtration, washed with water, and ultimately dried at 105oC under reduced pressure. Lamellar crystals that melted on heating were obtained. Solid-liquid phase transitions were observed by optical microscopy at 160oC, 159oC, and 117oC for MgSt2, CoSt2, and CuSt2, respectively. However, the melting points of MgSt2, CoSt2, and CuSt2 were determined as 115oC, 159oC, and 111oC, respectively, by analysis by differential scanning calorimetry. The onset temperature of the mass loss was the lowest at 255oC for CuSt2 and the lowest activation energy for thermal decomposition was 18 kJ/mol for CuSt2. CoSt2 was effective in extending the induction time of PVC dehydrochlorination at both 140oC and 160oC. The activation energy calculated from stability time decreased from 175 kJ/mol for a blank PVC sample to 114, 105, and 107 kJ/mol for MgSt2, CoSt2, and CuSt2-containing PVC samples, respectively. All three metal soaps accelerated the dehydrochlorination of PVC. J. VINYL ADDIT. TECHNOL., 21:235-244, 2015.TUBITAK (MISAG 185
Comparison of 1869 thyroid ultrasound-guided fine-needle aspiration biopsies between general surgeons and interventional radiologists
No full textConclusion: The results from both of the clinic's rates of non-diagnostic FNAB, performed via USG, were found to be acceptable. Our study also demonstrates that USG-guided FNAB can be performed with a low non-diagnostic rate as experience grows. (C) 2016 The Author(s). Published by Elsevier Ltd on behalf of IJS Publishing Group Ltd
Author Correction: A new ape from Türkiye and the radiation of late Miocene hominines
No full textCorrection to: Communications Biology, published online 23 August 2023. In the original version of the Article, two authors and their affiliations were omitted. In the original version of the Article, author first names were not provided for all authors. The corrected author list and affiliations are provided below. This has now been corrected in the HTML and PDF versions of the article. Ayla Sevim-Erol1, David R. Begun2, Alper Yavuz3, Erhan Tarhan4, Çilem Sönmez Sözer1, Serdar Mayda5, Lars W. van den Hoek Ostende6, Robert M. G. Martin2 ; M. Cihat Alçiçek7 1 Ankara University, Faculty of Languages History and Geography, Department of Anthropology, Ankara, Türkiye 2 Department of Anthropology, University of Toronto, Toronto, ON, Canada 3 Mehmet Akif Ersoy University of Science and Letters, Department of Anthropology, Burdur, Türkiye 4 Hitit University Faculty of Science and Letters, Department of Anthropology, Çorum, Türkiye 5 Ege University Fakulty of Science, Department of Biology, İzmir, Türkiye 6 Naturalis Biodiversity Center, Leiden, The Netherlands 7 Pamukkale University, Department of Geology, 20070 Denizli, Türkiye The Author Contributions section should read “A.S.E. is the PR of the project, secured funding for excavations and lab analysis and directed excavations. A.S.E. and D.R.B. are responsible for data curation, acquired funding and supervised research. D.R.B. conceptualized the analysis, conducted the investigation, developed the methodology, prepared the original draft and all subsequent versions. C.S.S., S.M., L.W.vdH. and C.A. contributed their analysis of geological and paleontological results. R.M.G.M. was responsible for the segmentation and analysis of the scans of the mandible. A.Y and E.T. participated in the excavations.” This has now been corrected in the HTML and PDF versions of the article. © 2023, Springer Nature Limited
A comparative study of the reasons for and means of setting-up a small business: the case of Turkish Cypriot restaurateurs and lawyers in North Cyprus and Britain.
No full textPhDThis study aims to generate insights into the business start-up activities of Turkish
Cypriot business owners in the restaurant and the legal sectors in North Cyprus and
Britain, by drawing cross cultural comparisons between the two sectors, and the two
countries. The research objectives are to examine the business start-up reasons for
Turkish Cypriot restaurateurs and lawyers; to identify and investigate, the 'forms of
capital' (Bourdieu, 1986) that they acquire and deploy; and to compare and contrast the
business start-up activities of Turkish Cypriots cross-nationally, North Cyprus and
Britain, and cross-sectorally, restaurant and legal sectors.
Methodologically, the research draws on extensive fieldwork with 66 participants
drawn from two different sectors in both countries. Applying a critical realist
methodology, experiences of participants are examined by analysing rich interview
material and documentary evidence.
Business start-up activity of Turkish Cypriots is a multi-faceted phenomenon, which is
examined in this thesis by looking into the interplay of agentic and structural influences.
The agentic influences, such as individual reasons for financial betterment, serving to
their community groups, desire for independence, are intertwined with structural
factors. The most important structural factors appear to be the importance of family and
changing socio-economic conditions. There are cross-country and cross-sectoral
variations in the degree to which these factors influence business set-up experiences.
The thesis makes empirical contributions to this field of study. There have been
extensive studies which have touched on ethnicity, sectoral differences, cross-national
variations and individual forms of capital. However, there has not been a study which
looked at the complex intersection of these key structural influences on business set-up
activity. This study fills this gap and contributes to our understanding of mainstream
and minority ethnic business start-up experiences between business start-up experiences
in one ethnic community across two sectors and two countries. Empirically, the research
findings reveal that both agentic and structural influences shape 'business start-up
activity of Turkish Cypriots in restaurant and legal sectors, in North Cyprus and Britain
Akdeniz Bölgesi Seralarında Yetiştirilen Bitkilerin Beslenme Durumlarının incelenmesi II. Domates, Hıyar, Biber ve Patlıcan Bitkilerinin Beslenme Durumları
Get PDFBu çal ışma, Akdeniz Bölgesinde yeti ştirilen domates, h ı yar, biber ve patl ı can bitkilerinin beslenme durumlar ı n ı incelemek ve beslenme sorunlar ı n ı belirlemek amac ı yla yap ı lm ışt ı r. Bu amaçla; domates, h ı yar, biber ve patl ı can yetiştirilen toplam 314 adet seradan yaprak örnekleri al ı nm ışt ı r. Yaprak örneklerinde, azot N , fosfor P , potasyum K , kalsiyum Ca , magnezyum Mg , demir Fe , bak ı r Cu , çinko Zn , mangan Mn ve bor B analizleri yap ı lm ışt ı r. Yaprak örneklerine ait analiz sonuçlar ı sı n ı r değerleri ile karşı laşt ı r ı larak incelenen bitkilerin beslenme durumlar ı n ı n ortaya konulmas ı na çal ışı lm ışt ı r. Elde edilen bulgulara göre, domates bitkisi yaprak örneklerinin N, Ca, Mg, Fe, Cu, Mn kapsamlar ı sı n ı r değ erlerine göre yeterli ve fazla düzeyde, K ve B kapsamlar ı yönünden noksan, P ve Zn bakı m ı ndan ise büyük çoğ unlu ğ u yeterli ve noksan düzeylerde belirlenmi ştir. H ı yar bitkisi yapraklar ı n ı n N kapsamlar ı noksan düzeyden fazla düzeye kadar de ğ i şim gösterirken, P, Ca, Mg, Fe, Cu, Zn ve Mn kapsamlar ı bak ı m ı ndan yeterli, K kapsamları yönünden örneklerin ço ğu ve B bakı m ı ndan da hemen hemen tamam ı noksan düzeylerde belirlenmi ştir. Biber bitkisinin yaprak örneklerinin N, P, Ca, Mg, Fe, Cu, Zn ve Mn kapsamlar ı bak ı m ı ndan çoğ unluğu yeterli ve fazla, B kapsamları yönünden örneklerin tamam ı noksan, K bak ı m ı ndan ise noksandan fazla düzeye kadar de ğiştiği saptanm ışt ı r. Patl ı can bitkisi yaprak örneklerinin N, K, Mg, Cu kapsamlar ı noksan düzeyden fazla düzeye kadar bir değişim gösterirken, B kapsamlar ı bak ı m ı ndan örneklerin tamam ı noksan düzeyde, P, Ca ve Fe kapsamlar ı yönünden yeterli, Zn ve Mn kapsamlar ı bak ı m ı ndan ise noksan ve yeterli düzeylerde de ğişen bir dağı l ı m göstermiştir
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