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Relevant Properties (relevant + property)

Distribution by Scientific Domains

Physics and Astronomy	33%

Selected Abstracts

A set-oriented method definition language for object databases and its semantics

CONCURRENCY AND COMPUTATION: PRACTICE & EXPERIENCE, Issue 14 2003
Elisa Bertino
Abstract In this paper we propose a set-oriented rule-based method definition language for object-oriented databases. Most existing object-oriented database systems exploit a general-purpose imperative object-oriented programming language as the method definition language. Because methods are written in a general-purpose imperative language, it is difficult to analyze their properties and to optimize them. Optimization is important when dealing with a large amount of objects as in databases. We therefore believe that the use of an ad hoc, set-oriented language can offer some advantages, at least at the specification level. In particular, such a language can offer an appropriate framework to reason about method properties. In this paper, besides defining a set-oriented rule-based language for method definition, we formally define its semantics, addressing the problems of inconsistency and non-determinism in set-oriented updates. Moreover, we characterize some relevant properties of methods, such as conflicts among method specifications in sibling classes and behavioral refinement in subclasses. Copyright © 2003 John Wiley & Sons, Ltd. [source]

How children know the relevant properties for generalizing object names

DEVELOPMENTAL SCIENCE, Issue 2 2002
Susan S. Jones
Young children's novel word extensions indicate that their animal categories, like those of adults, are characterized by multiple similarities among instances; whereas their artifact categories, again like those of adults, are characterized more simply by commonalities among instances in shape. Three experiments shed light on the nature and development of a mechanism that enables children to organize novel lexical categories differently for different kinds of objects. Experiment 1 shows that, by adult judgments, animals and artifacts present different category organizations. Experiment 2 shows relations between both age and the number of nouns young children have acquired, and children's kind-specific generalizations of newly learned nouns. Experiment 3 is a training study in which even younger children show an ability to learn and then generalize highly abstract relations between different contextual cues and different category structures; and importantly, to learn more than one set of such relations at a time. Together, these three findings indicate one way in which children are able to rapidly and accurately form lexical categories that parallel those of adults in their language community. [source]

The influence of the particle size distribution on fluidized bed hydrodynamics using high-throughput experimentation

AICHE JOURNAL, Issue 8 2009
Renske Beetstra
Abstract The goal of the described project is to design mixtures of particles with optimal fluidization properties. Using high-throughput experimentation, a novel approach to study hydrodynamics in fluidized beds, the relevant properties can be obtained in a limited period of time. This approach is demonstrated by assessing the influence of particle size distribution on fluidized bed hydrodynamics of Geldart A powders. By manipulating the width of the particle size distribution of alumina powder, the bubble diameter is reduced up to 40%. The addition of fines to a given particle size distribution also decreases the bubble diameter up to 40%, whereas the addition of coarse particles hardly influences the bubble size. At low gas velocities, the bubble size was found to increase with fines addition or increasing standard deviation. © 2009 American Institute of Chemical Engineers AIChE J, 2009 [source]

A symmetry based approach to evaluation of carbon nanotube electronic hyperpolarizability

LASER PHYSICS LETTERS, Issue 12 2004
L. De Dominicis
Abstract The properties of the carbon nanotubes (CNTs) hyperpolarizability , due to , electrons is studied by using the formalism of the irreducible representations of CNT space symmetry group (G). The main contribution to the second order nonlinearity is demonstrated to come from electrons at the origin of the Brillouin zone (k = 0). Within this scheme, a description based on the isogonal point group associated to G accounts for the relevant properties of ,. (© 2004 by ASTRO, Ltd. Published exclusively by WILEY-VCH Verlag GmbH & Co. KGaA) [source]

Incentive schemes for executive officers when forecasts matter

MANAGERIAL AND DECISION ECONOMICS, Issue 5 2010
Joaquim Vergés
This paper develops a new perspective on results-based incentive schemes for non-CEO managers. It shows that it is possible to establish incentive schemes that take into account both the actual output obtained and the forecast figure previously established as a target, without the negative consequences derived from the perverse loop of hiding-ratchet effects. A general linear two-staged scheme is proposed. In addition, relevant properties of this incentive system are stated that show how principals (corporate management) may determine the expected forecasting behavior of agents (executive officers) by suitably choosing the scheme parameters according to a simple set of rules. Copyright © 2009 John Wiley & Sons, Ltd. [source]

Silver nanocluster containing diamond like carbon

PHYSICA STATUS SOLIDI (A) APPLICATIONS AND MATERIALS SCIENCE, Issue 4 2008
F. Schwarz
Abstract Applying Diamond Like Carbon (DLC) as medical coating has become well established since large scale plasma processes like Plasma Immersion Ion Implantation and Deposition (PIII&D) are available. Now the focus of research lies on systematic modification of certain biological relevant properties and the most recent field of interest turned to generating antimicrobial behaviour. This is desirable for medical tools as well as for different types of medical implants. Since silver and copper are known to provide a bactericidal effect, one tries to introduce clusters of these noble metals into the carbon matrix. The basic principle of the method presented is to convert a metal containing polymer film into DLC by ion bombardment. In this paper the hydrogenated DLC matrix is characterized and the evolution of the metal particles is studied. By means of film composition (RBS/ERD), bonding structure (Raman spectroscopy) and hardness (nanoindentation), the dependency of these material properties on ion species, energy and fluence is investigated. TEM imaging is used to visualize the film structure. Upon ion irradiation of the polymer films, increased density and considerable loss of hydrogen can be observed, which both are controlled by ion fluence and mass. The crosslinking of the carbon network, caused by hydrogen drive out as well as atomic displacements in collision cascades, results in the formation of a-C:H. The silver particles in the film some ion induced growth, but still remain as nanoclusters in the a-C:H matrix. (© 2008 WILEY-VCH Verlag GmbH & Co. KGaA, Weinheim) [source]