Analytical Solutions to the Hulthen and the Morse Potentials by using the Asymptotic Iteration Method

We present the exact analytical solution of the radial Schr\"{o}dinger equation for the deformed Hulth\'{e}n and the Morse potentials within the framework of the Asymptotic Iteration Method. The bound state energy eigenvalues and corresponding wave functions are obtained explicitly. Our results are in excellent agreement with the findings of the other methods.Comment: 13 pages and 2 table

Comparing of Welfare indicators between Turkey and European Union Member States

This study considered pre-selected socio-economic indicators of the first 15 members of the European Union, subsequent 9 countries from East and Central Europe and Turkey, analyzing the situations of countries and variables according to one another and betraying the possible commonalities and disparities between them. Aiming at finding possible similarities and disparities between them selected social economic indicators from EUROSTAT (2005 data were used) is acquired and by using related variables the multidimensional scaling analysis is applied. As a result of the multidimensional scaling analysis the obtained stress value for the two-dimensional configuration was 0,18. The k=2 dimension the stress value explains the data in the rate of 0,85387. It is important to look at the inflation rate and gini coefficient first, when the objective is to investigate the development and welfare indicators of a country. According to distances between Countries, higher welfare and development level was demonstrated in the first 15 members of the European Union. In the second dimension, the distances between the countries of East-Central Europe that subsequently joined the Union and Turkey show that they have similar welfare and development level.Multidimensional Scaling, Social Economics Indicators, EUROSTAT

Vibration Suppression And Reduction Of Walk Tendency In Horizontal Axis Washing Machines Using Semi-active And Active Suspension Control Methods

Tez (Yüksek Lisans) -- İstanbul Teknik Üniversitesi, Fen Bilimleri Enstitüsü, 2002Thesis (M.Sc.) -- İstanbul Technical University, Institute of Science and Technology, 2002Çamaşır makinalarında tambur içerisinde çamaşırın düzgün dağılmaması nedeniyle ortaya çıkan dengesiz yük dağılımı merkezkaç bir etki oluşturmaktadır. Dengelenmemiş yük dağılımıyla oluşan merkezkaç etkinin büyüklüğü tamburun hızıyla artan titreşimlere neden olur. Genliği en yüksek olan titreşimler sıkma devrine geçiş sırasında olmaktadır. Bu çalışmada, titreşim genliğini azaltmak için şu ana kadar çamaşır makinasının süspansiyon sisteminde kullanılan kuru sürtünmeli sönümleyici yerine manyetoreolojik MR özellikli sönümleyici kullanılması önerildi. Süspansiyon sisteminin iki serbestlik dereceli modeline literatürden alınan MR sönümleyici modeli monte edilerek yarı-aktif süspansiyon sistemi oluşturuldu. İki serbestlik dereceli yarı-aktif ve pasif süspansiyon modellerinin performansları, titreşim genlikleri ve dikey doğrultuda iletilen kuvvetler göz önüne alınarak incelendi. Bundan sonra açık çevrim yarı-aktif kontrol metodu kullanılarak MR sönümleyicili süspansiyon modelinin davranışı ele alındı. Daha sonra yay, sönümleyici ve kütleden oluşan iki serbestlik dereceli pasif süspansiyon modeline değişik aktif titreşim kontrol teknikleri uygulandı. Son olarak ele alınan her bir kontrol metodunun, dengelenmemiş yük dağılımıyla oluşan titreşimleri gidermedeki etkinliği değerlendirildi.The main source of vibration problems in washing machines is due to the centrifugal forces of the rotating unbalanced laundry. These centrifugal forces generate vibrations whose amplitudes increase with the rotational speed of the drum and reach a peak during the transient period from washing to spin-extraction. The use of magneto-rheological dampers in the drum suspension is considered here in place of the customarily used passive dampers to enhance vibration suppression. In this study, a MR damper model taken from the literature is used along with a linear single degree of freedom model of the suspension system of the washing machine. Performances of both passive and semi-active suspension system models of the washing machine regarding displacement amplitude and the vertically transmitted force are investigated first. After that, an open-loop semi-active control method is implemented on the linear single degree of freedom model of the suspension system including MR damper in place of viscous damper. Finally, active vibration control methods are applied to the passive suspension model and effectiveness of each control method in suppressing the vibrations created by unbalanced laundry is evaluated.Yüksek LisansM.Sc

Modelling the relationship between water level and vertical displacements on the Yamula Dam, Turkey

International audienceMonitoring deformation pattern of dams is often one of the most effective ways to understand their safety status. The main objective of the study is to find the extent to which rising reservoir level affects the mechanism of deformation of The Yamula Dam under certain change in the reservoir level conditions during to the first filling period. Three different deformation analysis techniques, namely static, kinematic and dynamic, were used to analyze four geodetic monitoring records consisting of vertical displacements of nine object points established on the Dam and six reference points surrounding of it, to see whether the rising reservoir level have a role in the vertical deformations during the first filling period. The largest vertical displacements were in the middle of the dam. There is an apparent linear relationship between the dam subsidence and the reservoir level. A dynamic deformation model was developed to model this situation. The model infers a causative relationship between the reservoir level and the dam deformations. The analysis of the results determines the degree of the correlation between the change in the reservoir level and the observed structural deformation of the dam

The effects of using the expanding (cort 1) thinking program in the unit " electiricity in our lives" in primary education 7th grade lesson, science and technology, to students academic achivement, scientific creativity and tendency of critical thinking.

Bu araştırmanın amacı, Cort 1 düşünme programının ilköğretim 7. Sınıf Fen ve Teknoloji dersi “Yaşamımızdaki Elektrik” ünitesinde kullanılmasının öğrencilerin akademik başarılarına, bilimsel yaratıcılıklarına ve eleştirel düşünme eğilimlerine etkisini incelemektir. Aydın ilindeki orta sosyoekonomik düzeyde olan bir ortaokuldan gruplar (deney ve kontrol grupları) seçilmiştir. Uygulamada yarı deneysel desenlerden ön test-son test eşleştirilmiş kontrol gruplu desen kullanılmıştır. Araştırmanın çalışma grubunu deney grubunda 24, kontrol grubunda 24 öğrenci olmak üzere toplam 48 öğrenci oluşturmaktadır. “Yaşamımızdaki Elektrik” ünitesi Başarı Testi, Eleştirel Düşünme Eğilimi Ölçeği ve Bilimsel Yaratıcılık Ölçeği araştırmanın veri toplama araçlarıdır. Öğrencilerin akademik başarılarını ölçmek amacıyla geliştirilen başarı testi, bilimsel yaratıcılık ölçeği ve eleştirel düşünme eğilimi ölçeği uygulama öncesi her iki gruba uygulanmıştır. 7. sınıf Fen ve Teknoloji ders kitabındaki ‘Yaşamımızdaki Elektrik’ ünitesi, deney grubuna Cort 1 düşünme programının Fen ve Teknoloji dersi kazanımlarına uygun olarak hazırlanan etkinlik yaprakları kullanılarak, kontrol grubuna ise ders programı ve ders kitabına bağlı kalınarak işlenmiştir. Uygulama sonrasında Başarı Testi, Bilimsel Yaratıcılık Ölçeği Ve Eleştirel Düşünme Eğilimi Ölçeği öğrencilere tekrar uygulanmıştır. Deney ve kontrol grupları arasında uygulanan yönteme göre anlamlı farklılığın olup olmadığını belirlemek üzere “Tek Faktörlü Kovaryans Analizi (ANCOVA)” kullanılmıştır. Uygulama sonucuna göre Cort 1 düşünme programı kullanılarak yapılan öğretim sonucunda deney grubunun akademik başarısının, bilimsel yaratıcılığının ve eleştirel düşünme eğiliminin kontrol grubuna göre anlamlı fark göstererek arttığı görülmüştür.The aim of this research is to examine the effects of using the Cort 1 thinking program in the unit “Electricity in our lives” in primary education’s 7th grade lesson, to students’ academic achievement, scientific creativity and tendency of critical thinking. Groups are selected from seventh graders with in Middle school of middle socioeconomic level in Aydın. The model of the study is Pre-test/Post-test control group quasi experimental design. The participants of the research, as in 24 students in experiment group and 24 students in control group (total is 48). The “Electricity in our lives” unit, the achievement test, critical thinking tendency scale and scientific creativity scale, are the tools of data collection for research. The critical thinking tendency scale, scientific creativity scale, achievement test developed in order to measure the students’ academic achievement were applied the both groups before and after experiment. The mentioned unit has been carried out to the experiment group as using predominantly practice expression with the support of activity papers, and with respecting to lesson program and the textbook to control group. One factor ANCOVA for complicated measurements was used in order to measure if any specific differences between the methods used in both groups. Eventually the experiment group which was used the Cort 1 thinking program education was more accomplished than the other group in academic achievement, scientific creativity and tendency of critical thinking