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Search Results: 1 - 10 of 1109 matches for " Grzegorz Grzela "
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Polarization-dependent light extinction in ensembles of polydisperse, vertical semiconductor nanowires: A Mie scattering effective medium
Grzegorz Grzela,Djamila Hourlier,Jaime Gómez Rivas
Physics , 2013, DOI: 10.1103/PhysRevB.86.045305
Abstract: We present an experimental and theoretical study of the angle- and polarization-dependent light extinction in random arrays of polydisperse semiconductor nanowires epitaxially grown on substrates. The specular reflectance is described by averaging the scattering properties of individual nanowires obtained from Lorenz-Mie theory over the diameter distribution. The complex effective refractive index describing the propagation and attenuation of the coherent beam scattered in forward direction is determined in the independent scattering approximation and used to calculate the angle- and polarization-dependent reflectance. Our measurements demonstrate the highly anisotropic scattering in ensembles of aligned nanowires.
Mapping the directional emission of quasi-two-dimensional photonic crystals of semiconductor nanowires using Fourier microscopy
Yannik Fontana,Grzegorz Grzela,Erik P. A. M. Bakkers,Jaime Gómez Rivas
Physics , 2013, DOI: 10.1103/PhysRevB.86.245303
Abstract: Controlling the dispersion and directionality of the emission of nanosources is one of the major goals of nanophotonics research. This control will allow the development of highly efficient nanosources even at the single photon level. One of the ways to achieve this goal is to couple the emission to Bloch modes of periodic structures. Here, we present the first measurements of the directional emission from nanowire photonic crystals by using Fourier microscopy. With this technique we efficiently collect and resolve the directional emission of nanowires within the numerical aperture of a microscope objective. The light emission from a heterostructure grown in each nanowire is governed by the photonic (Bloch) modes of the photonic crystal. We also demonstrate that the directionality of the emission can be easily controlled by infiltrating the photonic crystal with a high refractive index liquid. This work opens new possibilities for the control of the emission of sources in nanowires.
Broadband and omnidirectional anti-reflection layer for III/V multi-junction solar cells
Silke L. Diedenhofen,Grzegorz Grzela,Erik Haverkamp,Gerard Bauhuis,John Schermer,Jaime Gómez Rivas
Physics , 2012, DOI: 10.1016/j.solmat.2012.02.022
Abstract: We report a novel graded refractive index antireflection coating for III/V quadruple solar cells based on bottom-up grown tapered GaP nanowires. We have calculated the photocurrent density of an InGaP-GaAs-InGaAsP-InGaAs solar cell with a MgF2/ZnS double layer antireflection coating and with a graded refractive index coating. The photocurrent density can be increased by 5.9 % when the solar cell is coated with a graded refractive index layer with a thickness of 1\mu m. We propose to realize such a graded refractive index layer by growing tapered GaP nanowires on III/V solar cells. For a first demonstration of the feasibility of the growth of tapered nanowires on III/V solar cells, we have grown tapered GaP nanowires on AlInP/GaAs substrates. We show experimentally that the reflection from the nanowire coated substrate is reduced and that the transmission into the substrate is increased for a broad spectral and angular range.
Mattering Moderates the Link between Gender Ideology and Perceived Fairness of the Division of Household Labor
Mylène Lachance-Grzela
Interpersona : An International Journal on Personal Relationships , 2012,
Abstract: This study examines the moderational role played by the feeling of mattering to the partner in the relationship between gender ideology and perceived fairness using a sample of 141 Canadian mothers with at least one child between the ages of two to five years old. Results support the moderator model and suggest that the emotional rewards mothers receive from their romantic partner influence the way they use gender ideology to evaluate the fairness of the division of family labor in their household. The results show that egalitarian gender ideology is associated with a greater sense of unfairness only when women feel that their partner demonstrates a low level of appreciation toward them. The findings are discussed in terms of the distributive justice theory.
New Method for Measurement of Plant Roots Specific Surface  [PDF]
Grzegorz , Jozefaciuk, Malgorzata Lukowska
American Journal of Plant Sciences (AJPS) , 2013, DOI: 10.4236/ajps.2013.45135
Abstract:

To provide enough space to carry all surface charges responsible for high cation exchange capacity of plant roots, large area of the root specific surface is necessary, however all experimental methods used up to date give too small surface area values. In this paper, we propose to measure the plant roots surface area using water vapor adsorption isotherm. This method gives roots specific surface areas compatible to CEC. Methodical aspects of the measurements are described along with theoretical background for calculating specific surface area on the example of roots of barley grown in nutrient solution.

Decentralization of a Multi Data Source Distributed Processing System Using a Distributed Hash Table  [PDF]
Grzegorz Chmaj, Shahram Latifi
Int'l J. of Communications, Network and System Sciences (IJCNS) , 2013, DOI: 10.4236/ijcns.2013.610047
Abstract: A distributed processing system (DPS) contains many autonomous nodes, which contribute their own computing power. DPS is considered a unified logical structure, operating in a distributed manner; the processing tasks are divided into fragments and assigned to various nodes for processing. That type of operation requires and involves a great deal of communication. We propose to use the decentralized approach, based on a distributed hash table, to reduce the communication overhead and remove the server unit, thus avoiding having a single point of failure in the system. This paper proposes a mathematical model and algorithms that are implemented in a dedicated experimental system. Using the decentralized approach, this study demonstrates the efficient operation of a decentralized system which results in a reduced energy emission.
Statechart-based Controllers Synthesis in FPGA Structures with Embedded Array Blocks
Grzegorz abiak , Grzegorz Borowik
International Journal of Electronics and Telecommunications , 2010, DOI: 10.2478/v10177-010-0002-7
Abstract: Statechart diagrams, in general, are visual formalism for description of complex systems behaiour. Digital controllers, which act as reactive systems, can be very conveniently modeled with statecharts and efficiently synthesized in modern programmable devices. The paper presents in details syntax and semantics of statecharts and new implementation scheme. The issue of statecharts synthesis is not still ultimately solved. Main feature of the presented approach is the transformation of statechart diagrams into Finite State Machine, and through KISS format, functional decomposition and mapping into Embedded Memory Blocks. Embedded Memory are part of the modern programmable devices.
Periodic solutions for nonautonomous differential equations and inclusions in tubes
Grzegorz Gabor
Abstract and Applied Analysis , 2004, DOI: 10.1155/s1085337504403042
Abstract: We study the existence of periodic trajectories for nonautonomous differential equations and inclusions remaining in a prescribed compact subset of an extended phase space. These sets of constraints are nonconvex right-continuous tubes not satisfying the viability tangential condition on the whole boundary. We find sufficient conditions for existence of viable periodic trajectories studying properties of the exit subset of the tube. A new approximation approach for continuous multivalued maps is presented.
A de Casteljau Algorithm for -Bernstein-Stancu Polynomials
Grzegorz Nowak
Abstract and Applied Analysis , 2011, DOI: 10.1155/2011/609431
Abstract: This paper is concerned with a generalization of the -Bernstein polynomials and Stancu operators, where the function is evaluated at intervals which are in geometric progression. It is shown that these polynomials can be generated by a de Casteljau algorithm, which is a generalization of that relating to the classical case and -Bernstein case.
Novel Insights into the Role of Caveolin-2 in Cell- and Tissue-Specific Signaling and Function
Grzegorz Sowa
Biochemistry Research International , 2011, DOI: 10.1155/2011/809259
Abstract: Caveolin-2 is one of the major protein components of cholesterol- and glycosphingolipid-rich flask-shaped invaginations of plasma membrane caveolae. A new body of evidence suggests that caveolin-2 plays an important, and often more direct, role than caveolin-1 in regulating signaling and function in a cell- and tissue type-specific manner. The purpose of this paper is to primarily focus on discussing how these recent discoveries may help better understand the specific contribution of caveolin-2 to lipid raft- and caveolae-regulated cell/tissue-specific signaling and functions.
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