Materials Literature
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The fullerides with composition A n In x Ga y C 60 (A=K,Rb,Cs; n=2,3; x,y<1) have been synthesized by a new method using liquid alloys of metals with indium and gallium (gallams) at room temperature. It was found that the fulleride K 2 In x Ga y C 60 is a superconductor with transition temperature T c = 24.5 K that ex…
Photoelectric emission from organic and metal thin films is generally observed with irradiation of photon energy larger than 4 eV. In this paper, however, we report photoelectric emission from Ag on a zinc-phthalocyanine (ZnPc) layer at a photon energy of 3.4 eV. The threshold energy for this photoelectric emission is…
YBa 2 Cu 3 O 7−x (YBCO) films were fabricated at various laser repetition rates on CeO 2 /YSZ/CeO 2 buffered Ni-W tapes by pulsed laser deposition (PLD). The dependence of structural and superconducting properties on the laser repetition rates was investigated. The microstructure and surface morphology of YBCO films w…
The paper is devoted to the sensitive films for application in chemical sensors. These films, made of the sol-gel derived porous silica, were fabricated via a sol-gel dip-coating method. We have obtained silica layers of the minimum refractive index of ~ 1.22 and porosity ~47%. These layers were sensitized with a pH i…
Thin films of Bi 2 Sr 2 CuO 6 (Bi-2201) with (001) or (115) orientation were grown on SrTiO 3 substrates. These films are expected to be useful as component films of heterostructures and devices (e.g. as insulators). We used two chemical routes, namely spin coating followed by thermal annealing and MOCVD. For both rou…
Power transformers based on High Temperature Superconductors (HTS) technology have revealed potential for several practical applications, offering economic, environmental and operational benefits. In this work, two 650 VA single-phase transformers prototypes were developed, tested and characterized: a conventional one…
The preparation of biaxially textured BaFe1.8Co0.2As2 thin films has been optimized on MgO single crystals and transfered to piezoelectric (001) Pb(Mg1/3Nb2/3)0.72Ti0.28O3 substrates. By utilizing the inverse piezoelectric effect the lattice parameter of these substrates can be controlled applying an electric field, l…
Liquid nitrogen (LN 2 ) based electrical insulation systems for superconducting equipment of electrical power distribution networks are state of the art. Since LN 2 is a cryogenic liquid it has some disadvantages when used as insulation. This paper deals with syntactic foam as an alternative insulation system for supe…
It is shown that the identification of the double groups required for treating molecular problems involving an odd number of electrons can be solved using abstract group theory without consideration of explicit matrices as in Pauli's discussion using spin matrices. This presupposes that the character tables are arrays…
A single-cylinder engine was used to assess the sensitivity of emissions, noise and fuel consumption to variation in cetane number when operated in low temperature combustion both with and without the application of compensation strategies. Without compensation, changes in cetane caused greater variability in all of t…
In this paper, we investigate differential subordination and superordination properties of a new class of meromorphic analytic functions in the punctured unit disc.We derive some sandwich theorems.
Pre-reacted powders of (Bi-Pb)2Sr2Ca2Cu3O10+δ (Bi-2223) were consolidated by using the spark plasma sintering (SPS) technique under vacuum and at different consolidated temperatures TD. We have found that the transport properties of SPS samples depend on their oxygen content because the SPS process is performed under…
We obtained the highest superconducting transition temperature of SmFeAsO1−xFx at 58.1 K by using low temperature synthesis with slow cooling. We found that the low temperature sintering suppresses the formation of amorphous FeAs, and the slow cooling introduces a high level of fluorine into oxygen site. By using this…
The paper is a literature review concerning polymer fuel cells. In the first part the structure, principle of operation and types of fuel cells (FC) are discussed. In-situ techniques used for evaluation of FC parameters in a single cell or assembled stacks, such as current-voltage characteristics (polarization curve),…
The compound KHIrO4, potassium hydrogentetraoxidoiridate(VI)(1-), crystallizes in a Scheelite-type structure containing discrete, slightly flattened, [Ir(O3OH)](-) tetrahedra--the first observation of a group 9 element in the 6+ oxidation state as an oxoanion.
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Abstract The J-aggregates of the diprotonated tetraphenylporphin formed in the o/w microemulsions including 2-alkyl alcohol, Triton X-100, toluene, and sulfuric acid, exhibited an induced circular dichroism (ICD) spectra corresponding to the chirality of the alcohol. The ICD intensity remarkably depended on the concen…
A formed device embedded-type 0402 sized (Ca0.7Sr0.3) (Zr0.8Ti0.2)O3(CSZT) embedded capacitor was fabricated for use in embedded printed circuit board. The capacitance and dielectric loss of the CSZT embedded capacitor were 406.1 pF and 0.015, respectively, at 1 MHz. The CSZT embedded capacitor exhibits stable capacit…
A fabrication process has been developed for fully planarized Nb-based superconducting inter-layer connections (vias) with minimum size down to 250 nm for superconductor very large scale integrated (VLSI) circuits with 8 and 10 superconducting layers on 200-mm wafers. Instead of single Nb wiring layers, it utilizes Nb…
Two-dimensional photonic crystal (2D PhC) waveguides with square lattice composed of dielectric rhombic cross-section elements in air background, by using plane wave expansion (PWE) method, are investigated. In order to study the change of photonic band gap (PBG) by changing of elongation of elements, the band structu…