Materials Literature
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We study a system of classical particles in two dimensions interacting through an isotropic pair potential that displays a martensitic phase transition between a triangular and a rhomboidal structure upon the change of a single parameter. Previously it was shown that this potential is able to reproduce the shape memor…
O papel kraft natural, produzido a partir da celulose marrom, e empregado na confeccao de sacos e sacolas e aplicacoes em embrulhos e revestimentos. Uma maior eficiencia do processo Kraft pode ser obtida a partir do aumento do numero Kappa , no qual se obtem polpas menos deslignificadas, minimizando os custos da madei…
Teve-se, com o presente trabalho, o objetivo de propor melhorias ao processo de soldagem executado para a fabricacao de rotores de turbinas tipo Francis utilizados em Pequenas Centrais Hidroeletricas (PCHs), por meio da alteracao da geometria da junta solda. Para tanto, confeccionaram-se quatro corpos de prova para pr…
We present a study of the alloying series of the noncentrosymmetric $f$-electron intermetallic ${\mathrm{CePt}}_{3}{\mathrm{B}}_{1\ensuremath{-}x}{\mathrm{Si}}_{x}$ by means of muon spin rotation and relaxation measurements. In addition, we include a high-pressure magnetization investigation of the stoichiometric pare…
Graphene is a relatively new material with unique properties that found application in the field of electronics and optoelectronics. A broadband absorption makes it especially interesting for photodetection applications. Middle-infrared domain of electromagnetic spectrum still lacks active media for photodetection tha…
We summarize recent theoretical works on artificial graphene realized by honeycomb lattices of semiconductor (CdSe, HgTe, CdTe) quantum dots forming a two-dimensional single-crystalline sheet. In the case of CdSe, we predict conduction bands with Dirac cones at two distinct energies and nontrivial flat bands. An analo…
Beton merupakan bahan yang paling banyak digunakan untuk konstruksi. Material ini memiliki kuat tekan tinggi, sebaliknya kelemahannya adalah kuat tarik yang sangat kecil, mudah retak karena getas. Berbagai bangunan infrastruktur misalnya terowongan memerlukan material daktail, yaitu dengan mencampurkan serat baja keda…
This thesis is centred around the study materials with novel electronic properties, including transition metals interacting with semiconductors and unique molecular systems. The idea of advancing modern computing is the basis for motivating the work in that the projects all have potential to be used in novel applicati…
The effect of temperature oscillation at the film edge on the phonon transport is examined in two-dimensional silicon and diamond films. A numerical solution of transient frequency-dependent Boltzmann equation is presented to account for the phonon transport in the thin films. Three different frequencies of temperatur…
present an account on a new avenue to synthesize radiotracers aimed at the eventual ability to radiolabel just about any substance for medicinal purposes.
Abstract The electronic structure and the magnetic properties of a new diluted magnetic semiconductor have been investigated, using first‐principles calculations within the Perdew–Burke–Ernzerhof generalized gradient approximation. Compound is a ‐type structure semiconductor with a direct bandgap of 0.57 eV at the poi…
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Relations structure-propriétés dans de petites molécules pi-conjuguées : électrochromisme, conversion photovoltaïque et mécanofluorocromisme Ce travail porte sur la synthèse et l’évaluation de systèmes pi-conjugués en tant matériaux actifs pour des dispositifs opto(électroniques). Un premier chapitre décrit une série…
Telah dilakukan eksperimen untuk membentuk lapisan tipis TiC dengan menggunakan metode PIRAC (Powder Immersion Reaction Assisted Coating) melalui proses difusional. Pada metode ini, substrat grafit dibenamkan dalam serbuk titanium. Selanjutnya, eksperimental awal dilakukan tanpa adanya penambahan yodium dalam serbuk t…
We demonstrate the exfoliation of large-area monolayer flakes prepared from bulk MoS2 crystals. The flakes are first characterized using Raman and photoluminescence measurements. We then utilize time-resolved Kerr rotation (TRKR) measurements to probe the valley dynamics in the monolayer flakes at low temperatures. Th…
A three phase induction motor differences of stator slot size is investigated in terms of its localized flux distribution. The search coil induced voltage method is used to analyze the flux distribution in the stator core. For both stator models, the maximum flux density is found near the tooth and minimum towards the…
With the rapid development of GaN light-emitting diodes (LEDs), LEDs have been utilized in various ways. However, the quality of the GaN epi-structure has been a popular topic. In order to achieve higher internal quantum efficiency (IQE), LEDs have to be made with few defects during the epitaxy growth. Here we propose…
We describe a robust and efficient chain-of-states method for computing Minimum Energy Paths~(MEPs) associated to barrier-crossing events in poly-atomic systems. The path is parametrized in terms of a continuous variable $t \in [0,1]$ that plays the role of time. In contrast to previous chain-of-states algorithms such…
Transparent and conductive Indium Tin Oxide (ITO) films were grown on borosilicate glass substrate by radio frequency (RF) magnetron sputtering process. The effects of sputtering parameters e.g. substrate temperature and RF power levels on electrical, optical and structural properties were examined. The crystallinity,…
The feasibility of Veselago lensing in graphene with a p-n junction is investigated numerically for realistic injection leads. Two different set-ups with two narrow leads are considered with absorbing or reflecting side edges. This allows us to separately determine the influence of scattering on electron focusing for…