Results 21 to 30 of about 320,727 (290)

Beyond Well-designed SPARQL [PDF]

open access: yes, 2015
SPARQL is the standard query language for RDF data. The distinctive feature of SPARQL is the OPTIONAL operator, which allows for partial answers when complete answers are not available due to lack of information.
Kaminski, Mark, Kostylev, Egor V.
core   +1 more source

The Assessment of Modification of High-Zinc Aluminium Alloy

open access: yesArchives of Foundry Engineering, 2014
The results of examinations of the influence of titanium-boron inoculant on the solidification, the microstructure, and the mechanical properties of AlZn20 alloy are presented. The examinations were carried out for specimens cast both of the non-modified
Zyska A.   +3 more
doaj   +1 more source

Wavefront reconfigurable metasurface through graphene micro-ribbons with resonant strategy

open access: yesResults in Physics, 2023
The majority of metasurfaces are static in their optical properties due to the principles of their construction. For the effect of wavefront reconfigurable, graphene provides the opportunity for adjustability via gate biasing.
Kai He   +6 more
doaj   +1 more source

Options to Improve the Mechanical Properties of Protein-Based Materials [PDF]

open access: yesMolecules, 2022
While bio-based but chemically synthesized polymers such as polylactic acid require industrial conditions for biodegradation, protein-based materials are home compostable and show high potential for disposable products that are not collected. However, so far, such materials lack in their mechanical properties to reach the requirements for, e.g ...
Lamp, Anne   +2 more
openaire   +3 more sources

Tissue biomimicry using cross-linked electrospun nonwoven fibre composites

open access: yesCurrent Directions in Biomedical Engineering, 2019
Mimicking the structural properties of natural tissue was aimed to be achieved by combining complementary mechanical properties of materials showing high tensile strength with those of high elasticity. By using two polymers with different properties, the
Illner Sabine   +8 more
doaj   +1 more source

Some Calibration Estimators of the Mean of a Sensitive Variable Under Measurement Error

open access: yesMathematics
This study explores the estimation of the mean of a sensitive variable using calibration estimators under measurement error. Three randomized response techniques are evaluated: Partial Randomized Response Technique, Compulsory Randomized Response ...
Sat Gupta   +2 more
doaj   +1 more source

Sociological monitoring of customer satisfaction with the quality of the educational services

open access: yesВысшее образование в России, 2022
The article focuses on the properties and characteristics of the educational process, which determine its ability to respond to the educational needs of specific customers.
G. . Gaidukova
doaj  

Evaluation of fractal dimensions from bitmap image (Part: Algorithms)

open access: yesActa Universitatis Agriculturae et Silviculturae Mendelianae Brunensis, 2004
The work assembled the complex application for evaluation of main fractal characteristics from input image. New simple modifications of evaluation of positive cells according to appropriate scale were implemented.
Petr Koňas
doaj   +1 more source

PROPERTIES OF OPTION PRICES IN MODELS WITH JUMPS [PDF]

open access: yesMathematical Finance, 2007
We study convexity and monotonicity properties of option prices in a model with jumps using the fact that these prices satisfy certain parabolic integro–differential equations. Conditions are provided under which preservation of convexity holds, i.e., under which the value, calculated under a chosen martingale measure, of an option with a convex ...
Ekstrom, Erik   +2 more
openaire   +3 more sources

Synthesizing Probabilistic Invariants via Doob's Decomposition

open access: yes, 2016
When analyzing probabilistic computations, a powerful approach is to first find a martingale---an expression on the program variables whose expectation remains invariant---and then apply the optional stopping theorem in order to infer properties at ...
Barthe, Gilles   +3 more
core   +1 more source

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