Materials Literature
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A principal contribuição para a exposição externa aos seres humanos provem da radioatividade natural presente em solos, principalmente do 40 K e das séries do 238 U e 232 Th.No presente trabalho foram determinadas as concentrações de atividade de 226 Ra (série do 238 U) , 232 Th e 40 K em amostras superficiais de arei…
This work is devoted to the study of interactions between fuel, flame and water droplets generated by water mist systems. It is completed by an extinction model development in FDS (Fire Dynamics Simulator) software, which is a CFD code widely used by the scientific and engineering communities. Knowledge on physical ph…
The socio-economic benefits anticipated with the use and production of nanomaterial and nanoparticles in consumer products are linked to the fulfillment of the requirement for sustainability during the whole material life cycle. Engineered nanoparticles (ENP) can be of environmental concern, both due to the possible h…
In this thesis, the application of moment matching based model order reduction techniques to first- and second-order model problems of Maxwell's equations in semiconductor structures is considered. Apart from preserving the specific structure of Maxwell's equations in the reduced order model, we provide a new Greedy-t…
It is shown that solutions of the Cauchy for the fourth-order thin film equation becomes non-oscillatory and non-sign-changing precisely at and above the heteroclinic bifurcation point n=1.75987..., so that, possibly, these solutions begin to coincide with nonnegative solutions of a standard and well-known free-bounda…
We consider the modified phase-field crystal (MPFC) equation that has recently been proposed by P. Stefanovic et al. This is a variant of the phase-field crystal (PFC) equation, introduced by K.-R. Elder et al., which is characterized by the presence of an inertial term $βϕ_{tt}$. Here $ϕ$ is the phase function standi…
Ce travail a pour objectif d'étudier la formation des aérosols organiques secondaires (AOS) formés dans l'atmosphère à partir de l'oxydation en phase gazeuse de composés organiques volatils en présence d’oxydants atmosphériques (ozone, radicaux hydroxyle, chlore et nitrate). Parmi eux, les hydrocarbures aromatiques po…
There have been many studies in the energy field to achieve different goals such as energy security, energy independence and production of cheap energy. The consensus of the general population is that renewable energy sources can be used on a short-term basis to compensate for the energy requirement of the world. Howe…
Les betons de chanvre associent un granulat vegetal issu du chanvre, appele « chenevotte », et une matrice minerale. Ce sont des materiaux isolants repondant particulierement bien aux nouvelles problematiques environnementales du secteur du bâtiment. Pourtant, leur developpement est freine par d'occasionnels desordres…
This data set contains global Surface Radiation Budget (SRB) and a few top-of-atmosphere (TOA) radiation budget parameters on a 1-degree x 1-degree spatial resolution. These parameters are provided as monthly, monthly-3 hourly (i.e. monthly average for a particular 3 hourly period) and 3-hourly averages. All monthly p…
Mechanical and functional properties of metals are strongly related to their microstructures, which are themselves inherited from thermal and mechanical processing. For example, the material grain size distribution plays an important role on the material yield limit and work hardening. The understanding of these micro…
We report the observation of biexcitons (AA) and heterobiexcitons (AB) in monolayer MoS2 measured using transient absorption spectroscopy. The binding energies of these biexcitons were measured to be 35 meV and 60 meV, respectively, rendering high-order electronic correlations stable against disorder and thermal fluct…
The improvement of specific performances of metallic materials used for aerospaceapplications needs continuous researches and developments. Titanium alloys are materials ofchoice for aerospace companies thanks to their high mechanical properties and low density.Among them, the β-metastable alloys that retain up to 40%…
Esta tesis doctoral define y desarrolla un nuevo modelo para el analisis del arco electrico en interruptores de baja tension. El modelo propuesto se ha desarrollado en un entorno software de dinamica de fluidos computacional, CFD, utilizando como base un analisis de volumenes finitos, FVM. La herramienta comercial uti…
Kurzfassung Charakteristisch für Warmarbeitswerkzeuge ist eine individuelle werkzeugspezifische Beanspruchung und ein daraus resultierendes breites Spektrum an spezifischen lebensdauerbegrenzenden Schädigungen. Da die Schädigung vor allem auf die oberflächennahen Randbereiche beschränkt ist, eröffnet eine Randschichtb…
The present work is a trail to evaluate the synthesized slow release system of composed of poly poly( -amino ester) (PAE) containing drugs as antitumor for sustained time period. The network structures from poly( -amino ester) were synthesized via a simplified addition polymerization method to carry drug for applying…
Bacterial cellulose, produced by Acetobacter xylinum, is an interesting material for using as a wound dressing since it provides moist environment to a wound resulting in a better wound healing. However, bacterial cellulose (BC) itself has no antibacterial activity to prevent wound infection. To achieve antibacterial…
Dual orexin receptor (OXR) antagonists (DORAs) such as almorexant, SB-649868, suvorexant (MK-4305) and filorexant (MK-6096), have shown promise for the treatment of insomnias and sleep disorders. Whether antagonism of both OX1R and OX2R is necessary for sleep induction has been a matter of some debate. Experiments usi…
다양한 이온성 액체를 사용하여 은이 담지된 이산화티타늄 입자를 제조하였다. 합성에 사용된 이온성 액체의 종류에 따라 입자의 물성이 변하는 것을 관찰하였다. 이는 이온성 액체의 특성이 은 입자들의 결합에 영향을 주기 때문이다. 제조된 입자의 촉매 성능을 측정하기 위하여 산소분위기에서 벤질알코올의 산화반응을 실시하였다. 그 결과 1-octyl-3-methylimidazolium tetrafluoroborate를 이용하여 합성한 $Ag/TiO_2$ 입자가 가장 우수한 촉매 활성을 나타내었다. $Ag/TiO_2$ particle was prepared using vario…
(метод термического анализа). m). Обнаружены вакансии фтора в позиции 8с и междоузельные анионы в двух позициях 32f. Соотношение дефектов в структуре Sr0.7Ce0.3F2.3 соответствует тетраэдрической конфигурации кластера дефектов {Sr4 - nCenF26}. Дефектная структура закаленного (со скоростью 25 K/мин) кристалла отличается…