11351 research outputs found
Sort by
An Optimal Reinsurance Contract from Insurer\u27s and Reinsurer\u27s Viewpoints
Get PDFThis article constructs two classes of appropriate reinsurance contracts from both an insurer’s and a reinsurer’s viewpoints. The first class, say C; has been constructed by minimizing the conditional tail expectation, say CTE, of an insurer’s random risk. Then an optimal reinsurance contract has been obtained by estimating the reinsurance’s random risk, using the Bayesian estimation method while the second class of reinsurance contracts, say C*; is obtained by minimizing a convex combination of the CTE of both the insurer’s and reinsurer’s random risks. These two approaches consider both the insurer’s and reinsurer’s viewpoints to establish an optimal reinsurance contract. A simulation study has been conducted to show practical implementation of our results
Asymptotically Double Lacunary Equivalent Sequences in Topological Groups
Get PDFIn this paper we study the concept of asymptotically double lacunary statistical convergent sequences in topological groups and prove some inclusion theorems
Fabrication of layer-by-layer electrospun composite membranes based on polylactic acid (PLA) and poly (caprolactone) (PCL)/Chitosan
No full textTissue engineering is an interdisciplinary field that applies the principles of engineering and life sciences towards the tissue development. Scaffolds can provide physical support and carry growth factors to the target cells. In this study, multi-layered composite scaffolds or membranes were fabricated using poly (lactic acid) PLA and by blending of synthetic polycaprolactone (PCL) and natural Chitosan layer-by-layer with a multilayer electrospinning technique. Scanning Electron Microscopy (SEM), water contact angle measurement (WCA) and water uptake were measured to characterize the multilayered scaffolds. Using optimized solution concentrations and processing parameters, the composite PLA and PCL/Chitosan was successfully fabricated layer-by-layer. It was found that the composite microfibrous membranes were homogenous. No beads were observed in the microfibers of the membranes. The composite layer-by layer membrane had enhanced wettability and water uptake properties than single layered membranes
Almost output regulation of discrete-time switched linear systems
No full textIn this paper, we propose a new hybrid control approach for almost output regulation of a class of discrete-time switched linear systems with average dwell time (ADT). Both controlled plant and exosystem are described by switched linear systems. The proposed hybrid controller is constructed as a switching impulsive system, where the controller states will undergo impulsive jumps at each switching instant. By using the ADT technique incorporated with multiple quadratic Lyapunov functions, the hybrid synthesis conditions for almost output regulation with asymptotic stability and weighted H∞ performance are formulated as a set of linear matrix equations and linear matrix inequalities (LMIs), which can be solved effectively. The proposed hybrid control method has been demonstrated through a numerical example
Sperm DNA assays and their relationship to sperm motility and morphology in bulls (Bos Taurus)
No full textThe relationship among sperm DNA assays in bulls with different sperm motility and morphology measures has not been reported. The objectives of the present study were to (1) describe Comet assay measures and examine their repeatability (inter- and intra-assay); (2) compare sperm DNA quality assays (i.e., Sperm Chromatin Structure Assay-SCSA; alkaline and neutral Comet assays and Sperm Bos Halomax assay-SBH) in two groups of bulls selected on either greater and lesser sperm motility and morphology (greater compared with lesser); (3) determine the relationship among DNA assays and sperm motility and morphology values. Inter-assay repeatability was greater for the neutral Comet assay as compared to the alkaline Comet assay. Intra-assay repeatability was greater than inter-assay repeatability for both Comet assays. Comet assay dimension measures and percentage tail DNA were the most repeatable for both Comet assays. Among sperm DNA quality assays, only SCSA measures and neutral Comet assay Ghosts (% Ghosts), head diameter and area, and comet area were different between greater and lesser sperm quality groups (P\u3c0.05). The SCSA measures were inversely correlated with neutral Comet head measures (diameter, area, and intensity) and positively with percentage Ghosts (P\u3c0.05). The % Ghosts and COMP-αt were correlated with some measures of sperm morphology and sperm motility. The neutral Comet assay was more appropriate for sperm evaluation than the alkaline Comet assay for distinguishing among groups with different sperm quality
Hartree-Fock energy of a finite two-dimensional electron gas system in a jellium background
No full textWe adopt a Hartree-Fock approach and calculate the energy of a finite two-dimensional electron gas system confined to a region that is treated as a positive jellium background. The electrons are considered fully spin-polarized (spinless) and interact with a Coulomb potential. The calculation of the exact potential energy of electrons in a finite square jellium domain is very challenging since the mathematical expressions depend on each component of particle\u27s position and not the radial distance from the center of the domain. In order to address this issue we introduce an approximation to the problem. We assess the quality of this approximation and discuss instances where its use is not only desirable, but also fairly accurate. The results give a correct picture of how the energy of the finite system evolves towards the bulk value as the size of the system increases
Shape-dependent energy of an elliptical jellium background
No full textThe jellium model is commonly used in condensed matter physics to study the properties of a two-dimensional electron gas system. Within this approximation, one assumes that electrons move in the presence of a neutralizing background consisting of uniformly spread positive charge. When properties of bulk systems (of infinite size) are studied, shape of the jellium domain is irrelevant. However, the same cannot be said when one is dealing with finite systems of electrons confined in a finite two-dimensional region of space. In such a case, geometry and shape of the jellium background play a role on the overall properties of the system. In this work, we assume that the region where the electrons are confined is represented by a jellium background charge with an elliptical shape. It is shown that, in this case, the Coulomb self-energy of the elliptically shaped region can be exactly calculated in closed analytical form by using suitable mathematical transformations. The results obtained reveal the external influence of geometry/shape on the properties of two-dimensional systems of few electrons confined to a small finite region of space
Panther - April 2015 - Vol. XCV No. 7
Get PDFhttps://digitalcommons.pvamu.edu/pv-panther-newspapers/1409/thumbnail.jp
A new insight into design approach with focus to architect-client relationship
No full textMany studies stress cooperation between architects and clients in which knowledge and experiences are shared in order to reach synergy. Thus, a process approach is required to make the latent knowledge and intention of the client explicit, efficiently connecting him/her to the architect. However, little attention has been given to socio-technical features of this relationship within architectural design process. This study aims to present an approach with collaborative, communicative and innovative features, which develop client involvement, information sharing and design-supporting tools within architectural design process. A literature survey has been conducted to investigate the characteristics of the communication process, architectural design process, design-supporting tools and means, method and concept of virtualization in design and communication. Finally, this study concluded by integrating the concept of virtualization and virtual reality tools into communication and design process. A new design approach will be generated, which will satisfy both architect and client, as well as design outcomes
