1987 Cilt 2 Sayı 1
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Item Open Access Application des méthodes mathématiques de planification par expérience en resolution des problemes a caractere électronique(Uludağ Üniversitesi, 1987) Chermoukhamedov, A.; Oktay, Ali; Uludağ Üniversitesi/Mühendislik Fakültesi.In this article, mathematical methods based on planification by experience are used in order to determine a mathematical model for the dielectric permittivity of polybenzoxazole film under the effects of several physical parameters. The analytical relationships between these parameters and the dielectric permittivity are very important as far as the technology of electronic devices these are contain dielectric materials.Item Open Access Bir kaymalı yatağın elasto hidrodinamik incelenmesinde sonlu farklara dayanan bilgisayar programı(Uludağ Üniversitesi, 1987) Dinç, Saim; Güllü, Emin; Kopmaz, Osman; Uludağ Üniversitesi/Mühendislik Fakültesi/Makine Bölümü.In this study performance characteristics of journal bearings are investigated, including the shaft deformation. To determine the pressure distribution and oil film thickness Reynolds' differential equation is solved with Reynolds type of boundary conditions while constitutive equations, usable for linear elastic materials, are utilized to determine the deformations. When shaft deformation is considered together with linear deformotion, bearing performance is observed to be in negligibly important. Therefore it can be concluded that elasticities of bearing materials must be taken into account during design.Item Open Access Fiziksel beyazlatıcı maddeler(Uludağ Üniversitesi, 1987) İskender, Abdülhalik; Erdoğan, Bahar; Uludağ Üniversitesi/Mühendislik Fakültesi.In this article optical whiteners, physical whitening agents are examined. Examples for nucleating agents and optical whiteners are given. Physical whitening agents are examined in two groups as blueing materials and fluorescent brighteners. Their regions in the spectrum are given. On the other hand fluorescent brighteners are classified as anionic, cationic and diapers and also they are explained. Asa result the criteria for selecting a brightener are given.Item Open Access Çamcağız kaolininin (İvrindi - Balıkesir) jeolojisi ve teknolojik özellikleri(Uludağ Üniversitesi, 1987) Erdinç, Hayri; Uludağ Üniversitesi/Mühendislik Fakültesi/İnşaat Bölümü.In this study, the Palaeozoic (Pre-Permian, Permian) and Cenozoic (Tertiary, Quaternary) rocks and the kaolin deposit in the location of Çamcağız around Küçük Yenice village of lurindi town in Balıkesir have been investigated. The kaolin deposit of Çamcağız was derived from the alteration of the pyroclastic rocks of Tertiary age by hydrothermal solutions. DTA, X-ray diffractometer and electron microscope analysis of the specimens collected from the pit have confirmed that kaolinite was the chief clay mineral and alunite, quartz and iron oxide minerals were the impurities. The Kaolin reserve of Çamcağız aero has been estimated about 1.273.200 tons (visible + probably) and is currently being used essentially in the ceramic industry. Studies also show that the above mentioned row material can be used in paper pulp which serves as a filling substance. In contrast, kaolin in the Çakmak area contains iron oxide and alunite in higher degrees and therefore can not be used in the ceramic industry without purificotion.Item Open Access The investigation of the effecfs of fatigue on the residual strength of composite materials(Uludağ Üniversitesi, 1987) Ülkü, Sedat; Uludağ Üniversitesi/Mühendislik Fakültesi.This paper presents the results of an investigation into the effects of fatigue on the residual strength of a 0°/90° CFRP composite. Cycling was carried out at five different stress levels over a range of 60 % to 90 % of the ultimate tensile strength of the composite. For a given stress level a relationship has been derived between the residual strength and the fatigue life of the composite. This relationship the fatigue characteristics for any given stress level without the need for time consuming and expensive testing. It has been shown that stress concentrations affect a crossplied laminate to a lesser extent than unidirectional laminates and homogeneous materials.Item Open Access Single peak differential thermoluminescence method for calculation of the trap energies(Uludağ Üniversitesi, 1987) Selçuk, Ata; Uludağ Üniversitesi/Mühendislik Fakültesi.''There are mathematical formulas in the summary. Please open the file read.''Item Open Access The strength of joints in fibre reinforced plastics(Uludağ Üniversitesi, 1987) Ülkü, Sedat; Uludağ Üniversitesi/Mühendislik Fakültesi.This work, mostly theoretical, relating to all aspects of adhesively bonded joints in composite materials is reviewed. The theoretical work is subdivided into classical and finite element methods. General principles and design guidelines are also presented.The load carrying joints in composite materials can be affected by two basic methods is mechanical fastening or adhesive bonding. This work is seen to be related mainly to theoretical results, derived either from classical analytical or finite element methods. The various approaches are compared with each other arıd, wlıere possible, willı experimental data.This work, mostly theoretical, relating to all aspects of adhesively bonded joints in composite materials is reviewed. The theoretical work is subdivided into classical and finite element methods. General principles and design guidelines are also presented.The load carrying joints in composite materials can be affected by two basic methods is mechanical fastening or adhesive bonding. This work is seen to be related mainly to theoretical results, derived either from classical analytical or finite element methods. The various approaches are compared with each other and, where possible, with experimental data.Item Open Access Buhar sıkıştırmalı ısı pompasına etki eden parametrelerin incelenmesi(Uludağ Üniversitesi, 1987) Yamankaradeniz, Recep; Uludağ Üniversitesi/Mühendislik Fakültesi/Makine Mühendislik Bölümü.In this study, the cycle calculations and the determination of the coefficient of performance for the vapour compression heat pump are explained. The variation of the coefficient of performance according to changes in the condenser and evaporator temperatures, calculat by a computer program are given. The effect of superheating and subcooling on the coefficient of performance is explained by curues. Concepts of heat pump efficiency and primary energy rate are given and the factors affecting them are examined.Item Open Access Computer-aided-design of workholding devices(Uludağ Üniversitesi, 1987) Öztürk, F.; Uludağ Üniversitesi/Mühendislik Fakültesi/Makine Bölümü.This paper describes a CAD system used for workholder design. The interactive system can be used to generate the best location system for a workholder and also assist with the positioning of supports and clamps in order to minimise the influence of the machining forces.Item Open Access Kurşun-antimuan alaşımlarının hızlı katılaştırma ile üretimi ve pb-asit akümülatörlerine uygulanması açısından önemi(Uludağ Üniversitesi, 1987) Demirci, A. Halim; Akçal, Ümit; Uludağ Üniversitesi/Mühendislik Fakültesi.In der gegenwartigen Technologie werden die Schnell-Erstarrungsverfahren zur Erzielung besserer Werkstoffeigenschaften in zunehmendem Masse herangezogen. Als ein Anwendungsbeispiel dieser Verfahren wurde hiermit versucht, anhand einer Reihe von Pb-Sn-Legierungen den Einfluss der Abkühlgeschwindigkeit auf ihre Eigenschaftanderungen zu ermitteln, sowie die Bedeutung erzielter Untersuchungsergebnissen bezüglich der Anwend Wendbarkeit an Pb-Akkumulatoren zu zeigen.Item Open Access Uranyum dioksidin termodinamik özelikleri(Uludağ Üniversitesi, 1987) Kırbıyık, Mehmet; Uludağ Üniversitesi/Mühendislik Fakültesi.In this study, thermodynamic properties and equations of state concerning solid, liquid and liquid vapor phase of uranium dioxide were given in empirical and analytical formulas. Menzles' critical point estimates of 2000 bars, 800 K and 0.33258 cm3/g were used. Moreover, the relations of the speed of sound were derived in 8ingle and two-phase domains for adiabatic process.Item Open Access Methode de determination du profil de la constante diélectrique a partir de la connaissance du champ électrique(Uludağ Üniversitesi, 1987) Oktay, Ali; Uludağ Üniversitesi/Mühendislik Fakültesi/Elektronik Bölümü.La détermination d’un profil de constante diélectrique est un problème de grand intérêt susceptible d 'applications nombreuses dans la conception de composants micro-ondes. L'objet de cet étude est de reconstruire un profil de constante diélectrique dans un guide d'onde rectangulaire rempli homogénéiquement de matériaux diélectriques, à partir de la connaissance de la configuration du champ électrique. Cette méthode donne un moyen technique pour connaître des propriétés d 'un matériau diélectrique traités par des hyperfréquences en vue de réaliser des applicateurs assurant un transfert efficace d 'énergie.Item Open Access Nükleer fisyon(Uludağ Üniversitesi, 1987) Dinçer, Salih; Uludağ Üniversitesi/Mühendislik Fakültesi.Fission reaction is a special type of a nuclear reaction in which a large nucleus split into two medium-mass nuclear fragments and additional two are three neutrons, but also a large amount of energy is emitted. A special type of fission in which a heavy nucleus such as U2 3 5 absorbs a slow neutron and breaks into two equal-size fragments in each such fission 200 Me V of energy is released. In a nuclear reactor the number of fissions per unit time is controlled and the liberated nuclear energy is used to make steam to drive turbines and generate electrical power. If the reaction is uncontrolled the number of fissions will increase geometrically, resulting in all the energy of the source being released over a short time interval, producing a nuclear bomb. In this article the theory of the fission reaction mentioned above is described.Item Open Access Floating ADC method for series- parallel A/D conversion(Uludağ Üniversitesi, 1987) Tütüncüoğlu, Ergür; Uludağ Üniversitesi/Mühendislik Fakültesi.In this paper, a fully integrable 8 bit series-parallel AD converter based on a new "floating ADC" principle is presented. Cross-plot tests of the experimental converter revealed that the differential nonlinearity of the 8 bit system will be less than ± LSB for an analog input voltage of fV pp· A converter of this type provides a good alternative to the all parallel system at sampling frequencies up to 100 M Hz. when chip size and power dissipation must be reduced.Item Open Access Endüstride radyoizotoplar(Uludağ Üniversitesi, 1987) Dinçer, Salih; Uludağ Üniversitesi/Mühendislik Fakültesi.In this paper there is a brief discussion of radioactive decay processes, the nature some of the nuclear radiations and a few measurement techniques used in industry.