2,079 research outputs found
Processing and Characterization of Zinc Oxide Nanoparticle Filled Polymeric Nanocomposites
No full textAn Investigation of Polymeric Nanocomposite: Surface Functionalization and Nanofiller Effect
No full text
Ida von Hahn-Hahn und Isabelle Eberhardt. Ausbruch aus Restriktionen – Auf der Suche nach sich selbst
No full textThe following thesis compares the travelogue Orientalische Briefe by the German author Ida von Hahn-Hahn with the travel journals Mes Journaliers by the French author Isabelle Eberhardt, in the context of how each woman represents herself as a female traveler and author. The comparative study analyzes whether both authors in these texts deal with the issue of breaking out of social and cultural restrictions while traveling to the ‘Orient’. The overall question of my thesis concerns what kind of filters did they use to speak about the ‘cultural other’.
The personal backgrounds of Ida von Hahn-Hahn and Isabelle Eberhardt differ in several aspects. The German author Ida von Hahn-Hahn visited the ‘Orient’ in 1843 temporarily and each place on only one occasion whereas the French author Isabelle Eberhardt constantly traveled at the end of the 19th century and at the same time she turned North Africa into her new home. These texts were analyzed in the context of gender discourse analysis, focusing on the discourse of feminity in the 19th century and the discourse of the Western world about the ‘Orient’. The comparison showed similarities and differences in the way both authors present themselves and the ‘Arab woman’ by (de-)constructing pre-existing ‘images’.
In my analysis I was able to demonstrate that both authors consciously deal with the western femininity discourse of the 19th century and the Western discourse about the ‘Orient’ by selecting similar motives. Even though their results are quite different, both authors clearly use the ‘Orient’ to express their search of one’s self
Investigation of effective material properties in composites with internal defect or reinforcement particles
No full textAbstractThis paper is concerned with the investigation of the effective material properties of internally defective or particle-reinforced composites. An analysis was carried out with a novel method using the two-dimensional special finite element method mixing the concept of equivalent homogeneous materials. A formulation has been developed for a series of special finite elements containing an internal defect or reinforcement in order to assure the high accuracy especially in the vicinity of defects or reinforcements. The adoption of the special finite element can greatly simplify numerical modeling of particle-composites. The numerical result provides the effective material properties of particle-reinforced composite and explains that the size of particles has great influence on the material properties. Numerical examples also demonstrate the validity and versatility of the proposed method by comparing with existing results from literatures
Characterization of the Dᵂ-Laguerre-Hahn functionals
No full text29 pages, no figures.-- MSC2000 codes: 33C45, 39A10.MR#: MR1914598 (2003e:33021)Zbl#: Zbl 1021.33007We give some characterization theorems for the DᵂLaguerre-Hahn linear functionals and we extend the concept of the class of the usual Laguerre-Hahn functionals to the Dᵂ-Laguerre-Hahn functionals, recovering the classic results when ᵂ tends to zero. Moreover, we show that some transformations carried out on the Dᵂ-Laguerre-Hahn linear functionals lead to new Dᵂ-Laguerre-Hahn linear functionals. Finally, we analyze the class of the resulting functionals and we give some applications relative to the first associated Charlier, Meixner, Krawtchouk and Hahn orthogonal polynomials.The work of the second author (FM) was supported by Ministerio de Ciencia y Tecnología (Dirección General de Investigación) of Spain under grant BFM 2000-0206-C04-01 and the INTAS project INTAS 2000-272.Publicad
Photovoltaic performance of amorphous silicon flexible solar modules under mechanical loading
No full textThe applications of photovoltaic devices can be significantly expanded by directly integrating them into structures. Solar cells integrated into structures can help to power a variety of devices such as structural monitoring sensors and unmanned aerial vehicles (UAVs). However, little work has been reported in the literature on the performance of solar cells under deformation. Thus, a thorough investigation on the photovoltaic behavior of solar modules under mechanical loading is necessary in order to provide the optimal integration conditions for practical applications. The photovoltaic performance of commercially available amorphous silicon solar modules was tested under applied mechanical stresses. The current density-voltage characteristics were measured at increasing stress levels during a uniaxial tensile test. As strain increased, the short circuit current density decreased, and at strains greater than 1.4%, the fill factor, and maximum power point degraded. The performance degradation is attributed to micro-structural changes in the form of cracking under applied stress. These results are required to determine the allowable loading conditions and failure mechanism in solar module integrated structural systems
Performance of thin-film lithium energy cells under uniaxial pressure
No full textThe objective of this study was two-fold. The first objective
was to determine if the all-solid-state thin-film lithium energy
cells could withstand the minimal 550 kPa uniaxial pressure
required for composite manufacturing, which both specimens
successfully did. The second objective was to determine the
upper boundary uniaxial pressure limit of operation for the
all-solid-state thin-film lithium energy cells. The two all-solid-
state thin-film lithium energy cells tested in the present
study under uniaxial pressure performed well even when
subjected to uniaxial pressures up to about 2.0 MPa. However,
pressures higher than this value led to their degradation.
The observed degradation was due to the mechanical
failure of the sealant. Above this pressure, the sealant was
squeezed out of the space between the two mica substrates
and the lithium-metal anode layer, which in turn allowed the
ambient air to penetrate into the energy cell core, thus leading
to the rapid degradation of the charge and discharge performance
and the ultimate demise of the energy cell. We found
out that, within the observed range, uniformly distributed packaging characteristics, we found that allsolid-
state thin-film energy cells charge/discharge
cycles under upwardly increasing
uniform uniaxial pressure are extraordinarily
robust and resilient to the effects of uniaxial,
uniformly distributed uniaxial pressure had little or no effect on the charge/discharge
performance of the all-solid-state thin-film lithium energy
cells. Other power charge/draws outside of 1 mAh were
not of interest in this study for the reasons already pointed
out, albeit that they may be considered for future studies.
Apart from other considerations for failure due to the current and
constant power charge/sink of 1mAh. If the
overall structure of the energy cell is mechanically
robust, i.e., of high structural integrity,
the maximum pressure that can be
imposed is expected to be much higher than
the maximum values noted earlier.
The present study indicates that all-solidstate
thin-film energy cells can be used as an
integral part of a load-bearing multifunctional,
smart material structure if their packaging
is of sufficiently high structural integrity.
Hence, the goal of using fiber reinforced
laminated composites as the packaging
material for all-solid-state thin-film batteries
in multifunctional smart materials structures
is well within reach
Asymptotic iteration method for solving Hahn difference equations
No full textHahn’s difference operator Dq;wf(x)=(f(qx + w) – f(x))/((q – 1)x + w), q ∈ (0, 1), w > 0,
x = w/(1 – q) is used to unify the recently established difference and q-asymptotic
iteration methods (DAIM, qAIM). The technique is applied to solve the second-order
linear Hahn difference equations. The necessary and sufficient conditions for
polynomial solutions are derived and examined for the (q;w)-hypergeometric
equation.Natural Sciences and Engineering Research Council of CanadaCanadian Network for Research and Innovation in Machining Technolog
The Approximate Jordan-Hahn Decomposition
No full textNon-commutative measure theory embraces measure theory on cr-fields of subsets of a set, on projection lattices of von Neumann algebras or JBW-algebras and on hypergraphs alike [20], [27], [33], [37], [39], [40], [41]. Due to the unifying structure of an orthoalgebra concepts can easily be transferred from one branch to the other. Additional conceptual inpetus is obtained from the logico-probabilistic foundations of quantum mechanics (see [6], [19], [21]).In the late seventies the author studied the Jordan-Hahn decomposition of measures on orthomodular posets and certain graphs. These investigations revealed an interesting geometrical aspect of this decomposition in that the Jordan-Hahn property of the convex set of probability charges on a finite orthomodular poset can be characterized in terms of the extreme points of the unit ball of the Banach space dual of the base normed space of Jordan charges.</jats:p
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