Uludağ Üniversitesi Mühendislik Dergisi / Uludağ University Journal of The Faculty of Engineering

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Yeni bir dipolmetre yapımı ve polar maddelerin dipol momentinin tayini
(Uludağ Üniversitesi, 1984) Sılay, İlhan; Balıkesir Mühendislik Fakültesi
In this study a new dipalemeter was constructed in order to determine the dipole moments of polar liquids. The resonance circuit was controlled by means of a quartz crystal of 1 M Hz and two variable precision condensers and an EM 80 lamp were used for this purpose. As an energy source, a 250 volt regulated stable source was prepared. Useful were given about the calibration method of the instrument; the advantageous capacity of the sample cell was found, anda phenol solution was prepared under 25° C in four different benzen concentrations and by the help of a dipalemeter the dipole moment value of the polar liquid was determined. The value found compared with the one in the literature.
Durgunluk noktası ve kuyulara permenan olmayan akım
(Uludağ Üniversitesi, 1984) Topacık, Dinçer; Eroğlu, Veysel
In this paper, stagnation point has been determined in the aquifers with a sloping piezometric surface. Formation constants and drawdowns have been calculated by the Theis equation and Jacob approach.
Açık uç (open-end) iplikçiliğinde kullanılan lif açma mekaizmaları
(Uludağ Üniversitesi, 1984) Özipek, Bülent; Mühendislik Fakültesi; Tekstil Mühendisliği Bölümü
In the present paper, the main features of open-end spinning which is one of the new spinning methods and has commercially developed at present time are summarized and fibre opening devices used in this spinning system are explained. It has been said that among the opening devices developed miniature taker-in type opening rollers are largely used and this type of opening roller has been described in detail. Also, it has been pointed out that the speed of opening roller has an effect on spinning performance.
İmalatta karşılaşılan problemler
(Uludağ Üniversitesi, 1984) Bir, Ahmet; Mühendislik Fakültesi
This, very detailed subject, is considered by using the experiences in business and selecting the important and interesting problems of engineering. The problems are collected into two groups: the technological problems and the problems of technical management. The technological problems are taken into account in two sections as in the establishment and test period and the maintanence and repair period of the foundation. In the main seetion on technical management, howewer, is considered the production planning and the relations between employee and employer.
Mimaride güneş kontrolü
(Uludağ Üniversitesi, 1984) Reman, Orhan; Balıkesir Mühendislik Fakültesi
Yeryüzündeki canlılar için güneş ışınımının hayat ve sağlık kaynağı olduğunu biliyoruz. Mekan düzenlemesinde en önemli unsur fonksiyona göre düzenlenmiş hacmin insan fızyolojisine en uygun aydınlanma ve güneş ışınımından yararlanabilmesi olmalıdır . Herhangi bir bölgede planlanmış bir proje için direkt güneş ışınımının günün çeşitli saatlerinde kış ve yaz aylarında kaç derecelik açı altında mekan içerisine girdiğini hesaplamak gerekir. Burada iki önemli açı söz konusudur. Bunlardan Azimut açısı; güneş ışınlarının geldiği yönü, Yükseklik açısı ise; bu yönde gelen ışınımın kaç derece açı ile geldiğini açıklamaktadır.
Elastic and geometric stiffness matrices for thın walled stiffener element
(Uludağ Üniversitesi, 1984) Saylan, Şerif; Toridis, Theodore
Elastic and geometric stiffness matrices for a structural stiffener member are obtained using the differential equations given by Chen and Atsuta 4. Presence of additional elements over the conventional form is observed in the geometric Stiffness matrix. The known transformation matrix is used to express the elements displacements with respect to the middle surface of the stiffened plate.
Otomotiv endüstrisindeki gelişmeler
(Uludağ Üniversitesi, 1984) Borat, Oğuz; Mühendislik Fakültesi; Makina Bölümü
The problems of the automotive industries, arised by the various constraints such as air pollution, decrease of fossil fuels, usage of alternative fuels, noise pollution, safety, fuel economy, etc., are studied under the titles of alternative fuels, alternative engines and technical improvements. Resultingly, the research subjects and the technological trends, required for solutions reductions of the problems to be faced in the short and long terms, are discussed.
Serçeören (Kepsut-Balıkesir) vollastonit yatağı
(Uludağ Üniversitesi, 1984) Erdinç, Hayri; Balıkesir Mühendislik Fakültesi; İnşaat Mühendisliği Bölümü
Vollastonit Türkiye için oldukça yeni bir hammaddedir. ilk üretimi 1968 yılında Serçeören yatağından yapılmıştır. Serçeören köyünün kuzeydoğusundaki kontakt metamorfızma kuşağında yer alan kalksilikat felslerin ana minerali olan vollastonit'e eşlik eden minerallerin bazıları granat, diyopsit, forsterit, vezüvyanit ve tremolittir. Bu alanda 500.000 ton kadar vollastonit tahmin edilmektedir. Günü müze değin, aralıklı olarak yapılan üretimle 100.000 ton saf vollastonit seramik endüstrisinde kullanmak için tüketilmiş , geriye % SO civarında vollastonit içeren kalksilikat felsler kalmıştır. Bunlardan yararlanıl ması zenginleştirme işlemlerinin geliştirilmesine bağlıdır . Kuzeybatı Anadolu'da yer alan asid bileşimli intrüsif kayaçiarın çevrelerinde birkaç yerde vol lastonit oluşumları bilinmekte olup, yenilerinin bulunma olasılığı oldukça yüksektir.
Effecfs of gravity on interdendritic fluid flow in large remelted ingots
(Uludağ Üniversitesi, 1984) Yerebakan, Metin; Mühendislik Fakültesi; Makine Mühendiliği Bölümü
This paper presents analytic calculations of the interdendritic fluid-flow in mush zones whose width is small compared to their length, a situation which is caracteristic of large remelted ingots. The flow is found to consist of two main components. The first one is normal to the isotherms which feeds solidification shrinkage and the second one is parallel to the isotherms which is produced by gravity acting on desity differences in the interdendritic liquid. If the isotherms are not exactly parallel, then the gravity induced flow parallel to the isotherms induces a component normal to it. This companent may cause the freckles that occur in remelted ingots when melting conditions are changed.
Hızlı üretken reaktörlerde kaza sonrası plutonyum aktivitesi ve kaçağı
(Uludağ Üniversitesi, 1984) Kırbıyık, Mehmet; Mühendislik Fakültesi; Makina Mühendisliği Bölümü
In the present study, radioactive plutonium isotope activities in inner and outer containment atmaspheres and time dependence if the change in the amount of plutonium isotopes released to the environment from the outer containment were calculated using an analytical method following the hypothetical core-disruptive accident in liquid metal (sodium) cooled fast breeder reactors. Calculations were made for 400 MW Fast Test Reactor whose fuel 7 % vaporized in the accident. lt was found that the radioactive plutonium concentration in each containment atmosphere was 10 13 times greater than the maximum permissible plutonium concentration in air, following the accident. The results show that the total leakage of the plutonium isotopes approximately increases asa lineer function of time. The total amount of plutonium released to the environment is approximately 22 Ci for 1,5 x 10 2 second and 430 Ci for 3 x 10 3 second.
Hafif inşaat malzemeleri
(Uludağ Üniversitesi, 1984) Erdinç, Hayri; Balıkesir Mühendislik Fakültesi; İnşaat Mühendisliği Bölümü
Lightweight aggregates are materials weighing less than usual aggregates of sand, gravel and crushed rock. They may be natural such as pumice, pumicite, diatomite and some vegetable products or manufactu red materials of heat operations i ncluding expanded perlite, vermiculite, day, shale, slate, cooled slags and coal breeze. Lightweight aggregates are used more widely in construction of multistory and commercial building, bridge decks, highway roads and other structures. Besides weighing less, these raw materials are ex cellent insulator and refractory. Some of them have applications in fıltration and agricultural secteurs. The industry of lightweight materials has progressed in the developed countries. These countries consume more than 70~0 percent of world's production. The domestic industry of these raw materials has not improved greatly in Turkey. But the production of expanded perlite has been accelerated to gain repo tation following USA and Russia. lt is hoped that lightweight aggregates will be considered to be valid and be used increasingly in constructions.
Ana ulaşım eksenleri ve beklenen zaman tasarrufları
(Uludağ Üniversitesi, 1984) Sütaş, İlhan
In this work, in order to bring to the same level the interregional development indexes for the developing countries, uniform the economic growth, distribute evenly the capital and service investments, minimize the demografic activities and land transport movements, the role of the Main Transportation Axes has been studied and the time savings that can be obtained between all of the settlement centers has been formulated with the aid of a new model.
Prediction of some turbulent flows using upwind and hybrid discretısa tion schemes and the two-eouation turbulence model
(Uludağ Üniversitesi, 1984) Choudhury, P. Roy; Gerstein, M.; Karasu, Tahir; Mühendislik Fakültesi; Makine Mühendisliği Bölümü
The paper presents the use of a numerical solution procedure for the prediction of steady, in compressible and two-dimensional turbulent flow in a pipe, in sudden expansions in pipes, and over a back ward-facing step using upwind and hybrid discretisation schemes. The numerical procedure employs a two-equation turbulence model, which entails the solution of two differential equations of transport for characteristics of turbulence; nameIy, the kinetic energy of turbulence and its rate of dissipation. The Reynolds stresses are related to the mean velocity gradients through a scalar turbulent viscosity, calculated from the above turbulence variables. In the near-wall regions, wall functions are employed. The predictions results from simultaneous solution of differential equations for conservation of mass and momentum, together with equations describing the transport of turbulence, by means of a finite-difference solution procedure. The predictions obtained using upwind and hybrid discretisation schemes are compared with each other and with published experimental data. For flows in which recirculation is present, the use of hybrid scheme results in closer agreement with measurements. In general, the predictions made are in good qualitative agreement with experiment.
Kristalin grafit ve dökme demirlerde grafit morfolojisi
(Uludağ Üniversitesi, 1984) Yerebakan, Metin; Mühendislik Fakültesi; Makina Mühendisliği Bölümü
Bu yazıda grafitin kristalize oluşuna ilişkin çeşitli teknikler ile kristal grafitin dökme demirlerdeki morfolojisi incelemektedir. Grafit kristallerinin elde edilmesi ile grafıtin modifikasyonları üzerinde durula rak, daha yüksek mukavemetli dökmedemirlerin üretilmesinde morfolojik olarak grafitin rolü izah edilmek tedir.
Atkı atma ve acızlık açma sistemleri açısından dokuma makinalarının günümüzdeki durumu
(Uludağ Üniversitesi, 1984) Alpay, H. R.; Mühendislik Fakültesi; Tekstil Mühendisliği Bölümü
In the present paper, the picking and the shedding mechanisms of weaving machines are studied and explanations about the commonly used systems are given. The picking mechanisms are emphasized, in particular, those which are of the most importance are explained in detail. The shedding mechanisms are briefly described from the point of view of their importance on the fabric design. A conclusion has been made.
Atomizasyon yöntemi ile metal tozları üretimi ve endüstriyel uygulamaları
(Uludağ Üniversitesi, 1984) Yerebakan, Metin; Mühendislik Fakültesi; Makina Mühendisliği Bölümü
Processing of powder materials begins with consideration of the powder properties and caracteristics such as size, shape, composition and structure. These powder features affects the response of subsequent compaction. sintering and densitication processes. Considerable effort is directed toward improved understanding of powder production-method called "atomisation" is reviewed, The mostflexible process in high tonnage production is atomisation since it provides the capability to produce gich quality alloy powders and affords greatest control over powder properties.
Mass specfrometer in investigation of the annealing process of the thermoluminescence phosphore
(Uludağ Üniversitesi, 1984) Selçuk, Ata; Mühendislik Fakültesi
Annealing process which is very important to obtain stable thermoluminescence character of the radiation dosimeters is investigated by using the Bendix 2001 GC-MS Time of Flight (T.O.F.) mass spectrometer. Natural calcium fluorite (No: 18, blue) is subjected to the annealing process in the range of 650°C and the evolved gases are recorded by mass spectrometer instantaneously. (m/e), 12, 15, 16, 17, 18, 20, 22, 24, 25, 26, 27, 28, 39, 40, 41 , 42, 43, 44 peaks are detected. This experiment has not performed to analyse the evolved gases and resudues in the sample. But instead to show a way how this can be done using a mass spectrometer.
Halk sanatı el örme desenlerinin modern örme makinalarında uygulanması
(Uludağ Üniversitesi, 1984) Tasmacı, Mehmet; Mühendislik Fakültesi; Tekstil Mühendisliği Bölümü
Die Handstrickerei, wie man sagen kann, began mit dem Bekleidungsgefıihl von Menschen seit früherer Zeiten. Eine Handstrickerei ist nicht anders als von einem einfachen strickerei bis zur Herstellung von Maschenwaren, mit der Hilfe von einfachen Geraten. Die Eigenart ist hier, dem man mit einem guten Geführt und Geschmak mit anzierenden Farben ein Gebilde produziert wird. Die Handstrickerei und ihre Mustern haben für die Entwicklung zu den heutigen und modernen Maschienen viel beigetragen. Mit der Hand lange Zeit dauernde Erzeugung von Muster wird mit der Mas chienen so kurzer zeit gefertigt, mit modernen Strick-und Wirkmaschienen kann man mit einfaden und Kettfaedenprinzip arbeiten und sie sind die Flach-und Rundstrickform gebaut worden. lhre Nadeln können so wohl einzelne als auch zusammen sich bewegen lassen und je nach dem, wird sie automatischweise mechanisch und elektronisch gesteuert. Die Fertigstellung der Mustern werden hier mit Jacguard-und Farbeiurichtung, Umhaenge-und Versatzeinricht~ngen, Ajour, Plattier, lntersia-und Einstreichtechniken durchgefıihrt.
Bazı adsorbanların fizikokimyasal özelliklerinin incelenmesi
(Uludağ Üniversitesi, 1984) Balkı, Nihat; Balıkesir Mühendislik Fakültesi
In this work the change of physicohemical properties of meerschaum, alumina, bentonite and kaolin with the temperature was studied and the effect of this change to that of adsorption yield was investigated.
Prediction of turbulent swirling flows in annuli
(Uludağ Üniversitesi, 1984) Spalding, Brian D.; Karasu, Tahir; Mühendislik Fakültesi; Makine Mühendisliği Bölümü
The paper presents the use of a numerical solution procedure for the prediction of steady, in compressible, and two-dimensional axisymmetric turbulent swirling flows in annuli. The mathematical model comprises differential equations for continuity, momentum, turbulence kinetic energy and its rate of dissipation. The simultaneous solution of these equations by means of a finite-difference solution algorithm yields the values of the variables at all internal grid points in the flow domain. The numerical solution procedure, composed of the mathematical model and its solution algorithm, is applied to predict the fields of variables within annular ducts; the results of predictions are compared with published experimental data. The predicted results for turbulent flow in a vertical large-gap annulus with both rotating and non-rotating inner cylinder, and for turbulent swirling flow in a stationary annulus with a rotating inlet were in generally good agreement with experimental measurements reported in the literature.

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