1984 Cilt 1 Sayı 1

Permanent URI for this collectionhttps://hdl.handle.net/11452/31800

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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.
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.
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.
Elektro-hidrolik aç-kapa (on-off) valflar
(Uludağ Üniversitesi, 1984) Yüksel, İbrahim; Mühendislik Fakültesi
This paper describes elektrohydraulic systems and elektro-hidraulic control valves used in these systems. Especially, operations of new developing on-off digital electro-hydraulic systems, which could be used in digital electro-hydraulic systems, have been investigated. Furthermore, on-off type of free floating disc valves are described. The single-dise valve, while having the merit of simplicity, was found to have a signifıcant steady state power loss when using a 25 mm diameter dics size. Due to this, lts main application is thought to be as a miniature pilot or first stage valve, as it could be manufactured to less than half the present size. The double-dise valve, while being more complex, has the important advantages of no quiescent power loss and low sensitivity to particle contamination
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.
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.
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.
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.
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.
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.
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.
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.
Yün, tiftik ve deve yünü liflerin fiziksel iç yapıları üzerinde elektron mikroskopla bir araştırma
(Uludağ Üniversitesi, 1984) Altınbaş, Emir Tekin; Mühendislik Fakültesi; Tekstil Mühendisliği Bölümü
Önemli tekstil maddelerinden; yün, tiftik ve deve yünü liflerinin incelik, uzunluk, direnç vb. çeşitlik teknolojik özellikleri birçok yerli ve yabancı araştırmalarla saptanmış ve bu alanda birçok bilgi ler ortaya konulmuştur . Ancak bu özelliklerin dayanağı olan lifterin fiziksel ve kimyasal iç yapıları üzerindeki araştırmalar ise, bu özelliklerin incelenmesine yarayışlı araç ve gereçlerin güç temin edilebilmesi nedeniyle sınırlı olmuştur.

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