Materials Literature
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This work presents a new formulation to predict refraction from flat electrically-thin lenses and reflectors comprised of inhomogeneous media. Snell law is not applicable to such devices but only for flat homogeneous interfaces. Refraction from electrically-thin surface in general can be physically explained through t…
The advent of Transformation Optics (TO) has led to a resurgence of interest in gradient-index (GRIN) optics. Furthermore, it has been noted that TO-derived lenses often possess better performance than those arrived at through more traditional GRIN design techniques. Due to the dispersive nature of optical materials,…
Periodic subwavelength structures on a boundary can enhance the transmission through the boundary. While rigorous methods are accurate for designing these structures, recent methods could benefit from an improved effective medium approximation. In this work, a modified Rayleigh mixture fomula is used to approximate th…
This research aims at the design of a circuit to provide power supply to every element in a sensor array in a scanning style for the data acquisition with very few wires. It is useful in data acquisition when there is a need of large amount of wires, but without enough space to hold these wires. It will make a sensing…
We present transmission measurement results of a cylindrical impedance metasurface used to reshape the radiation pattern of an enclosed two-dimensional current line source. The metasurface was fabricated using printed circuit board methods and measured in a parallel plate waveguide. Measurement results are in agreemen…
This paper provides a ground plane solution for the fractal-shaped reconfigurable dual-band slot-ring antenna by using the Electromagnetic Band-Gap (EBG) surfaces. The EBG surface is designed with an in-phase bandwidth from 1.7 to 3.0 GHz. A distance between the EBG and the antenna is selected to be 7. 5 mm. The EBG-b…
For the modeling of electron-hole interactions occurring in atomically thin transition metal dichalcogenides, the Keldysh approximation has been used in the recent literature. This work first explains how the exact Coulomb interaction energy can be evaluated for electron-hole pairs in a general multilayered medium and…
The resonant response of prolate nano-spheroids is numerically investigated via a surface integral equation method. Several results, such as the surface field distribution of dipole and higher order modes, the normalized extinction and the plasmonic albedo as a function of the axial ratio of the nano-scatterer, are ob…
This work focuses on a development of an accurate Finite Element Method (FEM) model to predict the Reed Critical Frequency (RCF) of an electric motor and a study of the influence of the fixation base on the deviations from the numerical to the experimental results. Ideally, the base for experimental tests needs to be…
Unique physicochemical properties of nanomaterials offer novel methodologies for disease treatment and diagnosis. Dynamic nanoparticle assemblies are adding an additional level of functionality and flexibility by combining multiple nanoparticle types into structures with stimuli-responsive size and surface chemistry.…
Chlordecone is a synthetic organo chlorinated compound that has been used as pesticide. It has been identified and listed as persistent organic pollutant by the Stockholm Convention. The use of activated carbon filters is one of the most widely popular solutions for water decontamination. The chlordecone labeled with…
The fundamental possibility of the MBE GaN nanowires growth on silicon substrate with nanoscale buffer layer of silicon carbide has been demonstrated for the first time. Morphological and spectral properties of the resulting system have been studied and compared properties of GaN nanowires on silicon substrate.
Essas integrais são para a matemática a mesma coisa que trabalhar com pesos e fazer ginástica para o futebol.(...) Se você quer jogar futebol para ganhar a vida, ou mesmo participar do time do colégio, vai ter de passar uma porc ¸ão de fins de semana enfadonhos no campo de treinamento.Não há outro jeito.Mas aqui está…
University of Minnesota Ph.D. dissertation. June 2016. Major: Mechanical Engineering. Advisor: Christopher Hogan. 1 computer file (PDF); ix, 1761 pages.
University of Minnesota Ph.D. dissertation. June 2016. Major: Chemistry. Advisor: Connie Lu. 1 computer file (PDF); xx, 183 pages.
Blue phosphorescent iridium complexes iridium(III)bis[(4,6-di-fluorophenyl)-pyridinato-N,C2'] (FIrpic) and yellow phosphorescent iridium complexes Iridium(III) bis (4-phenylthieno [3,2-c]pyridinato-N,C2′)acetylacetonate (PO-01) was doped into the small molecular phosphorescent host N, N_-dicarbazolyl-3, 5-benzene (mCP…
In this study, the effects of surface shape of ceramic laminated armor made of alumina (Al2O3) on the protection level using numerical modelling. Two types of surface shape namely concave and planar are considered. Both bullet and armor are modelled with NIJ Standards level IV. ANSYS Autodyn software is used in the de…
The conventional high temperature concrete for application in kiln and furnaces is a mixture of refractory aggregate and calcium aluminate cement binder. The CaO-Al2O3 binary equilibrium diagram provides useful information regarding existence of various calcium aluminates, out of which CA(CaO.Al2O3), CA2(CaO.2Al2O3) a…
In terms of development of GNSS-signal receiver examines the physical design of integrated passive components on the basis of the low-temperature ceramic, such as a power divider, stripline, microstrip and the associated microstrip transmission line, bandpass filter capacitor resonator. As a result of the physical des…
Here the reference phase technique is used in the design of all metallic zoned lenses based on the fishnet metamaterial. Several metalenses are designed and evaluated both numerically and experimentally. It is shown that the radiation gain is experimentally increased in 1.8 dB when the reference phase is applied to th…