Materials Literature
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In earth orbit, there are a great number of MMOD(MicroMeteoroid and Orbital Debris) which are increasing naturally every year. Since they move in extremely high velocity, it is possible to give a critical damage to the structure of satellites with impact. In this study, HVI(Hypervelocity Impact) simulation is performe…
In this paper, a full sequence of manufacturing process of outer race of the first generation hub bearing for passenger’s car is simulated with emphasis on tracing metal flow lines. The importance of metal flow lines in forging of the bearing is emphasized to enhance structural rigidity and product quality of bearings…
Smart-materials can be activated by various source such as electric, magnetic and thermal energy. These sources are powerful, and then strong instant activation is possible. However, these require direct connection to the power source structure or complex additional device. This makes it difficult be applied to smart…
Recent advances in computing power make atomistic modelling a viable approach for the study of complex chemical processes in a variety of applications. Atomistic modelling has, thus, the potential to explain some of the mechanisms of the most complex reactions occurring in construction materials such as carbonation of…
The thesis investigates synthesis, characterization, reactivity ratio determination and thermal studies of N-vinyl-2-pyrrolidone based copolymers and terpolymers. N-vinyl-2-pyrrolidone-co-methyl methacrylate, N-vinyl-2-pyrrolidone-maleic anhydride-methyl methacrylate, and N-vinyl-2-pyrrolidone-maleic anhydride-styrene…
This paper describes a terrestrial walking robot using poly-vinylidene fluoride (PVDF) / polyvinyl pyrrolidone (PVP) / polystyrene sulfuric acid (PSSA) blend membrane based ionic polymer metal composite (IPMC). The proposed IPMC actuator based on PVDF/PVP/PSSA polymer mixture of ratio 30/15/55 showed better performanc…
In this work it is presented the photorelease of two model neurotransmitter amino acids, namely glycine and β-alanine, from two different coumarins. These model neurotransmitters were chosen due to their biological importance as well as their pharmacological activities. The coumarin-amino acid conjugates were irradiat…
It is well known that microstructures of a heating surface significantly enhances critical heat flux (CHF) of pool boiling due to the surface roughness-amplified capillary force. We suggest the limitation of the capillary effect induced by the surface roughness, by modelling a capillary wicking flow and a permeable li…
Hydrogen crossover through a membrane is an inevitable phenomenon in a polymer electrolyte membrane fuel cell (PEMFC). Also, the hydrogen crossed over from anode side is directly reacted with oxygen at cathode side. As a result of direct reaction, water is produced and it hydrates the membrane. Thus, the membrane is n…
Flight safety analyses concerned with Launch Vehicle are performed to measure the risk to the people, ship and aircraft using impact point and impact dispersion area of debris generated by on-trajectory failures and malfunction turns. Predictions of impact point and impact dispersion area are essential for launch vehi…
Photo responsive polymer is well known for its photo bending feature, which contracts under UV light, and goes back to original shape under visible light. The main reason for this reversible deformation under different kinds of light is due to azobenzene monomer included in the polymer. As azobenzene monomer turns fro…
A Supercapacitor is an electrochemical device which has a higher energy density than a battery and a high power density than a conventional capacitor. Other than an activated carbon material, carbon nanotubes draw an attention to be also used as a promising electrode material because of its porous structure. The elect…
Το αντικείμενο της διδακτορικής διατριβής περιλαμβάνει τρείς ενότητες. Καταρχήν, την διερεύνηση της επίδρασης των βιοκαυσίμων στις ιδιότητες των βενζινών. Τα βιοσυστατικά που χρησιμοποιήθηκαν ήταν η αιθανόλη (EtOH) και ο αιθυλο-τριτοταγής-βουτυλαιθέρας (ETBE) σε εμπορικές βενζίνες. Τα καύσιμα βάσης που παρασκευάστηκαν…
In the present study, a two-dimensional numerical code is developed that is capable to predict the performance of a thermoelectric module that includes a p-leg and an n-leg together with top and bottom end plates. The present code can predict the heat flow, electric current, Joule heating, Peltier heating, Thomson hea…
Solution blow spinning (SBS) is a spinning technique for fabricating the sub-micron fibers by utilizing air pressure. Unlike the electrospinning, almost all materials can be spun due to conductivity is not required in the base material. Further advantages of this process are a simple process and low initial cost. In t…
The effect of coating melting behavior on nugget growth during resistance spot welding of hot- stamped boron steels was evaluated. A comparative analysis of the dynamic resistance for bare hot stamped and Al-Si coated hot stamped boron steels was carried out. The dynamic resistance curve of Al-Si coated hot stamped bo…
University of Minnesota Ph.D. dissertation. November 2014. Major: Chemical Engineering. Advisor: Prof. Eray S. Aydil. 1 computer file (PDF); x, 141 pages.
The purpose of this study is to suggest analysis model of RCB construction in nuclear power plant. For the objective, This study drew the risk factors of RCB construction from existing literature. The results of the study proposed analysis model made hierarchy in rebar, form, and concrete work. These will be baseline…
To evaluate flaws in reactor pressure vessel head penetration nozzles, it is important to consider the geometric constraints for each of the flaws. ASME B&PV code sec. XI proposed the evaluation procedure and acceptance criteria for the flaws detected in in-service inspection, but for some cracks, the code requires ca…
the power quality problems are common in most of industrial and commercial users. The non linear load can be generates current harmonics and/or voltage harmonics, which makes worse the power quality. Therefore, these harmonics must be mitigation. This review provides a survey of the mitigation of above mention harmoni…