The Experts below are selected from a list of 39711 Experts worldwide ranked by ideXlab platform
Lavinia Corina Ciungu - One of the best experts on this subject based on the ideXlab platform.
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Involutive filters of pseudo-Hoops
Soft Computing, 2019Co-Authors: Lavinia Corina CiunguAbstract:In this paper, we introduce the notion of involutive filters of pseudo-Hoops, and we emphasize their role in the probability theory on these structures. Characterizations of involutive pseudo-Hoops are given, and their properties are investigated. We give a characterization of involutive filters of a good pseudo-Hoop, and we prove that in the case of good pseudo-Hoops, the sets of fantastic and involutive filters are equal. One of the main results consists of proving that a normal filter F of a bounded pseudo-Hoop A is involutive if and only if A / F is an involutive pseudo-Hoop. It is also proved that any implicative filter of a bounded pseudo-Hoop is involutive and that any Boolean filter of a bounded Wajsberg pseudo-Hoop is involutive. The notions of state operators and state-morphism operators on pseudo-Hoops are introduced, and the relationship between these operators is investigated. For a bounded Wajsberg pseudo-Hoop, we prove that the kernel of any state operator is an involutive filter.
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Involutive filters of pseudo-Hoops
arXiv: Logic, 2017Co-Authors: Lavinia Corina CiunguAbstract:In this this paper we introduce the notion of involutive filters of pseudo-Hoops, and we emphasize their role in the probability theory on these structures. A characterization of involutive pseudo-Hoops is given and their properties are investigated. We give characterizations of involutive filters of a bounded pseudo-Hoop and we prove that in the case of bounded Wajsberg pseudo-Hoops the notions of fantastic and involutive filters coincide. One of main results consists of proving that a normal filter $F$ of a bounded pseudo-Hoop $A$ is involutive if and only if $A/F$ is an involutive pseudo-Hoop. It is also proved that any Boolean filter of a bounded Wajsberg pseudo-Hoop is involutive. The notions of state operators and state-morphism operators on pseudo-Hoops are introduced and the relationship between these operators are investigated. For a bounded Wajsberg pseudo-Hoop we prove that the kernel of any state operator is an involutive filter.
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Pseudo-Hoops with Internal States
Springer Monographs in Mathematics, 2014Co-Authors: Lavinia Corina CiunguAbstract:In this chapter we study the internal states for the more general fuzzy structures, namely the pseudo-Hoops, and we present state pseudo-Hoops and state-morphism pseudo-Hoops. We define the notions of state operator, strong state operator, state-morphism operator, weak state-morphism operator and we study their properties. We prove that every strong state pseudo-Hoop is a state pseudo-Hoop and any state operator on an idempotent pseudo-Hoop is a weak state-morphism operator. One of the main results of the chapter consists of proving that every perfect pseudo-Hoop admits a state operator. Other results refer to the connection of the state operators with states and generalized states on a pseudo-Hoop. Some conditions are given for a state operator to be a generalized state and for a generalized state to be a state operator.
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Algebras on subintervals of pseudo-Hoops
Fuzzy Sets and Systems, 2009Co-Authors: Lavinia Corina CiunguAbstract:If A is a bounded [email protected]?-monoid or a pseudo-BL algebra, then it was proved that a subinterval [a,b] of A can be endowed with a structure of an algebra of the same kind as A. Similar results were obtained if A is a residuated lattice and a,b belong to the Boolean center of A. Given a bounded pseudo-Hoop A, in this paper we will give conditions for a,[email protected]?A for the subinterval [a,b] of A to be endowed with a structure of a pseudo-Hoop. We will introduce the notions of Bosbach and Riecan states on a pseudo-Hoop, we study their properties and we prove that any Bosbach state on a good pseudo-Hoop is a Riecan state. For the case of a bounded Wajsberg pseudo-Hoop we prove that the two states coincide. We also study the restrictions of Bosbach states on subinterval algebras of a pseudo-Hoop.
Luboš Náhlík - One of the best experts on this subject based on the ideXlab platform.
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Residual stress in polyethylene pipes
Polymer Testing, 2016Co-Authors: Jan Poduška, Pavel Hutař, Jaroslav Kučera, Andreas Frank, Jiří Sadílek, Gerald Pinter, Luboš NáhlíkAbstract:Abstract This paper deals with residual stress in polyethylene (PE) pipes as an important factor that influences their lifetime. Residual Hoop stress distribution in a PE pipe was determined using a methodology previously carried out by the authors on polypropylene pipes. Axial residual stress magnitude was determined by comparison of experimental data and finite element modelling. Based on the obtained results, a new simplified methodology for determining the residual Hoop stress is proposed. The method needs only one circular specimen made of pipe, but, unlike older methods, provides a more precise estimation of residual Hoop stress distribution taking into account its exponential shape. Some older results from literature are recalculated using this method and residual Hoop stress of various PE pipe grades and dimensions are then compared. To provide an idea of residual Hoop stress influence on lifetime of a pipe, a lifetime estimation is carried out for the examined pipe.
Jung Ho Park - One of the best experts on this subject based on the ideXlab platform.
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a pull out suture for transection of the posterior horn of the medial meniscus using a posterior trans septal portal
Knee Surgery Sports Traumatology Arthroscopy, 2007Co-Authors: Jin Hwan Ahn, Joon Ho Wang, Jae Chul Yoo, Haeng Kee Noh, Jung Ho ParkAbstract:A transection (root tear or complete radial tear) injury of the medial meniscus posterior horn is not rare in the oriental area and needs to be repaired to restore the Hoop tension and to reduce the extruded meniscus, which leads to osteoarthritis of the knee. In cases with transection of the medial meniscus posterior horn, the meniscus can be repaired by a pull out suture technique. However, it is difficult to manipulate a suture hook and drill a tibial tunnel in the narrow medial joint space using the traditional anterior arthroscopic technique. This article describes a new pull out suture technique for transection of the medial meniscus posterior horn using a posterior trans-septal portal that provides a safe and wide field of vision. The handling of the suture hook and a guide may reduce the possibility of a chondral or meniscal injury.
Jan Poduška - One of the best experts on this subject based on the ideXlab platform.
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Residual stress in polyethylene pipes
Polymer Testing, 2016Co-Authors: Jan Poduška, Pavel Hutař, Jaroslav Kučera, Andreas Frank, Jiří Sadílek, Gerald Pinter, Luboš NáhlíkAbstract:Abstract This paper deals with residual stress in polyethylene (PE) pipes as an important factor that influences their lifetime. Residual Hoop stress distribution in a PE pipe was determined using a methodology previously carried out by the authors on polypropylene pipes. Axial residual stress magnitude was determined by comparison of experimental data and finite element modelling. Based on the obtained results, a new simplified methodology for determining the residual Hoop stress is proposed. The method needs only one circular specimen made of pipe, but, unlike older methods, provides a more precise estimation of residual Hoop stress distribution taking into account its exponential shape. Some older results from literature are recalculated using this method and residual Hoop stress of various PE pipe grades and dimensions are then compared. To provide an idea of residual Hoop stress influence on lifetime of a pipe, a lifetime estimation is carried out for the examined pipe.
Brahim Benmokrane - One of the best experts on this subject based on the ideXlab platform.
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efficiency of glass fiber reinforced polymer gfrp discrete Hoops and bars in concrete columns under combined axial and flexural loads
Composites Part B-engineering, 2017Co-Authors: Abdeldayem Hadhood, Hamdy M Mohamed, Faouzi Ghrib, Brahim BenmokraneAbstract:Abstract Discrete Hoop reinforcement is preferable over continuous spiral reinforcement due to ease of construction in bridge applications. This research presents the experimental results of full-scale circular concrete columns reinforced with glass-fiber-reinforced-polymer (GFRP) bars and confined with GFRP discrete Hoops subjected to combined axial compression loads and bending moments. The findings of the experimental work were integrated with a theoretical analysis based on the strain computability and force equilibrium to extend the parametric study. The lowest and highest bounds of the mechanical properties of GFRP reinforcement along with concrete strength and reinforcement ratio were employed. Sets of axial force–bending moment ( P-M ) interaction diagrams and indicative guide charts are introduced, and recommendations drawn. The compressive-strength contribution of GFRP reinforcement is reviewed and discussed. The results reveal that the GFRP bars developed compression and tension strains up to −0.003 and 0.008 at peak loads and up to −0.015 and 0.0135 at failure on the compression and tension sides, respectively. The confinement provided by GFRP discrete Hoops (9.5 mm) spaced at 80 mm prevented the buckling of longitudinal GFRP bars up to and even past the peak load until failure occurred. Based on the experimental and theoretical results, the minimum GFRP longitudinal reinforcement ratio was found to be 1% in order to prevent tension failure (GFRP-bar rupture), provided that the mechanical properties comply with the limits of the available codes and standard.
