Materials Literature
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A modified liquid phase epitaxy (LPE) technique, called lateral diffusion LPE (LDLPE), is invented for low cost and high efficiency solar cell applications. Potentially, LDLPE is able to produce single crystalline silicon wafers directly from the raw material, rather than cutting wafers from single crystalline silicon…
The velocity of sound in soap foams at high gas volume fractions is experimentally studied by using the time difference method. It is found that the sound velocities increase with increasing bubble diameter, and asymptotically approach to the value in air when the diameter is larger than 12.5 mm. We propose a simple t…
The magnetic anomaly associated with the premartensitic transformation (PT) in Heusler alloy Ni 2 MnGa is investigated by using the Green's function technique based on the magnon-TA phonon interaction. The results of the numerical calculations suggest that the magnetic anomaly during the PT may originate from the stro…
Additional losses of asynchronous induction machines utilized in traction drives caused by the inverter have a great impact of the thermal behaviour of such machines. Due to the different design strategies of such machines compared against commonly used standard machines, an accurate modelling and evaluation of these…
Proses pembuatan casing dan dudukan pisau merupakan proses penting dan termasuk dalam prioritas utama karena casing dan dudukan pisau berfungsi sebagai penutup transmisi sedangkan dudukan pisau sebagai penopang pisau. Tujuan dari proses pembuatan casing dan dudukan pisau ialah untuk mengetahui bahan yang digunakan, me…
peer reviewed
The study of the behavior of different track panel structures on the lines of the Croatian Railways has been completed in regular conditions of utilization. The subject research has been conducted by measurement of strain in straight and curved track sections.
The paper studies the regeneration possibilities of Dieselexhaust particle filters, as well as the resulting problems.The application of exhaust particle filters is more and morerequired, because of the increasingly severe limitations imposedon the exhaust emissions of the Diesel engine vehicles.They are particularly…
The exchange of energy between low-frequency mechanical oscillations and high-frequency vibrational modes in carbon nanotubes (CNTs) is a process that plays an important role in a range of dynamic phenomena involving the dissipation of mechanical energy in both individual CNTs and CNT-based materials. The rates and ch…
미크론 자성비드 검출용 바이오센서에 활용하는 GMR-SV 박막을 이온빔 스퍼터링 증착법으로 glass/Ta(5.8 nm)/NiFe(5 nm)/Cu(t nm)/NiFe(3 nm)/FeMn(12 nm)/Ta(5.8 nm)의 구조를 갖도록 증착하였다. 비자성체 Cu의 두께가 3.0 nm에서 2.2 nm까지 얇아질수록 교환결합력은 증가하였고 자기저항비는 다소 감소하였다. 비자성체의 두께가 얇으면 반강자성체의 층간 교환작용이 강자 성체의 고정층뿐만 아니라 자유층의 스핀배열에도 영향을 주고 있음을 확인할 수 있었다. 또한 리소그래피 공정 과정을 거쳐 GMR-SV 소자를 제작하…
Κατά τη διάρκεια της Διδακτορικής Διατριβής διερευνήθηκαν δυνατότητες χρησιμοποίησης υμενίων φωτολιθογραφικών υλικών για τη σχηματοποίηση μικρών βιομορίων, πρωτεϊνών και κυττάρων και αναπτύχθηκαν μέθοδοι για την επίτευξη αυτού του σκοπού. Επιλέχθηκε η χρησιμοποίηση πολυμερικών υμενίων, επειδή αυτά είναι πιο ανθεκτικά…
The Al 0.85 Ga 0.15 As layers buried below the GaAs core layer with and without the SiO 2 layer were successfully oxidized in a wet ambient environment. The experimental results show that the SiO 2 layer has little impact on the lateral-wet-oxidation rate of the Al 0.85 Ga 0.15 As layer. The contrast of the SEM image…
The numerical simulations on 500-N class rocket engine using 96% hydrogen peroxide and kerosene have been conducted, considering atomization, evaporation, mixing and combustion of its propellants. The grid containing 1/6 part of combustion chamber has been generated and it is assumed that 3 kinds of liquid-phase prope…
This paper presents results of investigation of the resonant particle intended to be used in design of metamaterial with negative refraction index that shows the isotropic response to irradiating wave. The particle has planar structure, therefore it can be simply fabricated by a standard PCB technology. The resonant p…
An approach is proposed that allows computationally efficient optimization of tune-free diplexers. Following the proposed technique the diplexer channels are virtually decoupled making their joint electromagnetic optimization unnecessary. In practice this is realized by using especially constructed resonance-type boun…
Sheet specimens of alloy AZ31 were cross-rolled to equivalent strains of 0.05, 0.10, 0.30, 0.40, 0.56, and 0.77. The microstructure evolution was examined using a combination of optical metallography (OM), Electron Backscattered Diffraction (EBSD), Transmission Electron Microscopy (TEM) and X-ray diffraction (XRD). Th…
Accuracy comparison of phase- and time-domain methods for locating partial discharge (PD) in power cables is presented in this paper. The PD location is based on the measurement from two-end of the cable. Phase-domain methods estimate the PD location from the phase difference between the initial waves of a PD signal a…
Η διατριβή αυτή αφορά διηλεκτρικά και θερμικά φαινόμενα εμφανιζόμενα σε γραμμές μεταφοράς και διανομής, τόσο κατά την κανονική λειτουργία τους όσο και κατά την εμφάνιση σφαλμάτων. Στο κεφάλαιο 1 γίνεται μια εισαγωγή στα συστήματα μεταφοράς και διανομής ηλεκτρικής ενέργειας. Συγκεκριμένα, γίνεται μια σύντομη παρουσίαση…
In the design of phase-change memory (PCM), it is important to perform numerical simulations to predict the performances of different device structures. This work presents a numerical simulation using a coupled system including Poisson's equation, the current continuity equation, the thermal conductivity equation, and…
Surface modifications or coatings onto the inner walls of microchannels are vital in order to tailor the surface chemistry of the material for a number of biomedical and lab-on-chip applications. The technique of dry-process-based plasma polymerization is appropriate for modifying the surface chemistry of a material b…