Materials Literature
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Russian Abstract: Исследовано напряженное состояние сварного соединения с несимметричной механической неоднородностью при статическом нагружении. Получены формулы для расчета тензора средних предельных напряжений на контактных поверхностях. English Abstract: The stressed state of welded joint with unsymmetrical mec…
为了提高砷化镓(GaAs)多结太阳电池的光电转换效率，设计了宽光谱(300 nm～1 800 nm)ZnS/Al2O3/MgF2三层减反射膜，分析了各层的厚度及折射率对三层膜系有效反射率的影响。结果表明： 对于整个波长，ZnS厚度对有效反射率的影响要大于Al2O3和MgF2，MgF2厚度对有效反射率的影响最小；适当减小MgF2的折射率或增加ZnS的折射率可得到更低的有效反射率。同时，当 ZnS，Al2O3和MgF2的最优物理厚度分别为52.77 nm，82.61 nm，125.17 nm时，此时最小有效反射率为2.31％。
The four main industrial processes needed to produce a plastic packaging structure are: cast extrusion, blown extrusion, injection moulding, and blown moulding. Since one polymer may not offer all the protection and marketing properties required for a specific food product, multilayer films can be produced. Each layer…
Τις τελευταίες τέσσερις δεκαετίες παρουσιάζεται μεγάλη πρόοδος στην ανάπτυξη μεταευρετικών μεθόδων δηλαδή αλγορίθμων που μπορούν να εφαρμοστούν σε δύσκολα προβλήματα βελτιστοποίησης για τα οποία είναι ακατάλληλη η χρήση αιτιοκρατικών προσεγγίσεων. Τέτοιες προηγμένες τεχνικές βασίζονται συνήθως στη μοντελοποίηση φυσικώ…
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Germanene, a graphene like single layer structure of Ge, has been shown to be stable and recently grown on Pt and Au substrates. We show that a Ge adatom adsorbed to germanene pushes down the host Ge atom underneath and forms a dumbbell structure. This exothermic process occurs spontaneously. The attractive dumbbell-d…
We explore the phase coherence of thin films of the topological insulator\nmaterial Bi2Se2Te grown through pulsed laser deposition (PLD) technique. The\nfilms were characterised using various techniques for phase and composition.\nThe films were found to be of good quality. We carried out extensive\nmagneto-transport…
A strip of 2D HgTe topological insulator is studied. The same-spin edge states in ideal system propagate in opposite directions on different sides of the strip and do not mix by tunneling. Impurities, edge irregularities, and phonons produce transitions between the contra-propagating edge states on different edges. Th…
Micro alloy vanadium steel is high strength low alloy steel, possessing precipitation strengthening carbonitrides, nitride & carbides during subsequent austenite to ferrite transformation. The carbides, nitrides of Vanadium has cubic body centred structure which exhibit certain cohesion with the cubic Steel matrix. Th…
Determination by FLUKA Monte Carlo Code of Thicknesses of Shielding Required for Controlled Areas in Proton AcceleratorsAbstract: The prompt radiation field produced by accelerated protons in proton accelerator is quite complex, consisting of a mixture of changed and neutral particles as well as photons. The goal of s…
Hydrothermal synthesis autoclave reactor offers simple, safer and environmentally friendlier process for the preparation of valuable nanoparticles. In this study, cadmium selenide (CdSe) quantum dot (QD) were successfully synthesized via one-step hydrothermal synthetic route at 195 oC. The reactant mixtures used for t…
A simple and efficient translational and rotational invariant digital system to classify diatoms image is presented. The system uses the modulus of the Fourier transform, intensity profiles and the standard correlation between the intensity profiles of the target and the image problem (image to identify). The system w…
Two batches of lead free ceramics of the composition (K 0.5 Na 0.5 ) 0.95 La 0.016 Nb 0.9 Ta 0.1 O 3 (KNNTaLa) were sintered between 1150 and 1180 °C. In the first batch, the samples were prepared in a sealed crucible embedded in powders of the same composition and, in the second, they were sintered in open air. Measu…
We consider the $C^1$-classification of gapped Hamiltonians introduced in [Fannes-Nachtergaele-Werner, Nachtergaele] as parents Hamiltonians of translation invariant finitely correlated states. Within this family, we show that the number of edge modes, which is equal at the left and right edge, is the complete invaria…
Thermosalient materials, or colloquially commonly called “jumping crystals”, are promising materials for conversion of thermal (or light) energy into mechanical work on the nanoscale. These materials, when heated or cooled, undergo a sudden and sharp polymorphic single crystal to single crystal phase transition. Durin…
El principal objetivo de esta tesis es analizar la influencia de la temperatura y del tipo de matriz en dos materiales compuestos de calidad aeronautica en uno de los modos de dano con mas influencia en la perdida de propiedades mecanicas, en este tipo de materiales, y que es la presencia de grietas interlaminares sus…
The structural, magnetic and magneto-transport properties of bulk ceramic double perovskite Sr2Fe1 delta-MoO6 (delta = 0.0, 0.02, 0.05 and 0.10) samples were systematically investigated. The rietveld fitted X-ray diffraction patterns shows the tetragonal symmetry with Fe deficiency up to delta = 0.10, which suggested…
Thermal shock resistance is a key property of refractory materials. Its determination and prediction is essential for the design of structural refractories as well as lining materials. Young’s modulus of elasticity (E) is a crucial parameter for the calculation of thermal shock resistance. For all investigated carbon-…
Currently, solid-state nuclear magnetic resonance (NMR) methodology is still evolving. However, this thesis focuses on the application of NMR methods to improving the understanding of solid-state hydrogen storage materials. In particular, this thesis demonstrates how NMR can provide a unique perspective on materials f…
En aquesta tesis doctoral s’han investigat capes primes i nanostructures de WO3 per sensat òptic de gasos. S’han realitzats els estudis de la síntesis dels materials nanoestructurats, la possible fabricació del dispositiu i les propietats per la detecció dels gasos. Han estat investigades les capes primes de WO3, amb…