14 research outputs found
NAISSANCE ET EVOLUTION DU CONCEPT D'EVALUATION DE LA QUALITE
No full textAn in-depth essay on quality control is presented. After a brief history of industry's concern with quality control, a concern more widespread and developed in Japan and the USA than in Western Europe where quality control programs are still in an experimental stage, the various criteria involved are listed: absolute criteria; functional criteria; availability criteria (reliability); sensorial criteria. Quality control management involves a number of distinct steps starting with a definition of terms and establishing outcome criteria. Secondly it involves defining the resources required, the structure items, while a third step is concerned with the definition of processes of resource utilisation (process items). The author discusses a quality control program in considerable detail and an extensive 96 item bibliography is appended.SCOPUS: NotDefined.jinfo:eu-repo/semantics/publishe
Design of multi-step dies for sheet metal forming using a workpiece-performance-based approach: A preliminary study
No full textDeep-drawn components are predominantly manufactured using multistep operations, e.g., in a progressive or transfer dies. Currently, intermediate die design is geometry-based and often neglects the influence of workpiece plastic flow during forming on the final part's mechanical performance. This approach results in non-homogeneous material deformation, inefficient material utilisation, wrinkling defects, and an increased risk of service failures. This study proposes an alternative workpiece-performance-based die-design approach for deep drawing, emphasising the critical role of material flow in determining the component's geometrical accuracy and mechanical properties. The strategy was experimentally tested on S420MC steel (1.8 mm thickness) square cups using two-step process chains: (1) a conventional method where the blank was partially drawn into a square cup, followed by full drawing, and (2) an alternative method starting with a circular blank partially drawn into a circular cup before full drawing to the square shape. Numerical analysis in AutoForm evaluates the evolution of effective plastic strain throughout the steps. The results demonstrate significant improvements, including more uniform strain distribution, a 7% wall thinning reduction, elimination of ironed wrinkles, and components with threefold increased strength and enhanced ductility. These findings highlight the potential of performance-based die design to improve material efficiency and structural reliability
Design of multi-step dies for sheet metal forming using a workpiece-performance-based approach: A preliminary study
No full textDeep-drawn components are predominantly manufactured using multistep operations, e.g., in a progressive or transfer dies. Currently, intermediate die design is geometry-based and often neglects the influence of workpiece plastic flow during forming on the final part's mechanical performance. This approach results in non-homogeneous material deformation, inefficient material utilisation, wrinkling defects, and an increased risk of service failures. This study proposes an alternative workpiece-performance-based die-design approach for deep drawing, emphasising the critical role of material flow in determining the component's geometrical accuracy and mechanical properties. The strategy was experimentally tested on S420MC steel (1.8 mm thickness) square cups using two-step process chains: (1) a conventional method where the blank was partially drawn into a square cup, followed by full drawing, and (2) an alternative method starting with a circular blank partially drawn into a circular cup before full drawing to the square shape. Numerical analysis in AutoForm evaluates the evolution of effective plastic strain throughout the steps. The results demonstrate significant improvements, including more uniform strain distribution, a 7% wall thinning reduction, elimination of ironed wrinkles, and components with threefold increased strength and enhanced ductility. These findings highlight the potential of performance-based die design to improve material efficiency and structural reliability
Inter‐Relations between Partner‐Provided Support and Self‐Efficacy: A Dyadic Longitudinal Analysis
No full textBasic formability analysis on new generation of high strength steel
No full textProyecto confidencial (Riunet)Cruz Pérez, ÁA. (2013). Basic formability analysis on new generation of high strength steel. https://riunet.upv.es/handle/10251/33237.Archivo delegad
Основания возникновения и прекращения правоотношений, связанных с использованием доменных имен второго и последующих уровней
No full textThe Grounds For the Emergence and Termination of the Legal Relations Hiprelated Tot Heuse of Domainn Amesthe Second and Subse Quent Levels Т. SiamionavaРассмотрены основания возникновения и прекращения правоотношений, связанных с использованием доменных имен второго и последующих уровней, ввиду того, что данные правоотношения по своей правовой природе являются гражданско-правовыми. Выполнена классификация оснований возникновения и прекращения правоотношений, связанных с использованием доменных имен, по характеру наступающих последствий. Доказано, что возникновение права на доменное имя имеет место не только на основании договора, а право владельца базируется не только на должном исполнении обязательств по договору с владельцем. Делается вывод, что право на доменное имя второго и последующего уровня приобретаются с целью свободного пользования, владения и распоряжения им, поэтому доменное имя представляет собой объект, имеющий экономическую ценность, право на доменное имя является имущественным с изъятиями.= The author analyzes the grounds for the emergence and termination of the legal relationship related to the use of domain names the second and subsequent levels, because these legal relations by their legal nature are civil; provides a classification of reasons of origin and termination of legal relations associated with the use of domain names, the nature of the coming consequences; proved that the origin of the domain name takes place not only on the basis of the contract and the right of the owner based not only on the proper performance of the obligations under the contract with the owner; concludes that the right to a domain name second and further levels are purchased for the purpose of free use, ownership and disposal of them, so a domain name is an object that has economic value. The right domain name is a property right, with some exceptions
The palynology and stratigraphy of the Cambrian Nolichucky Shale and associated formations at Thorn Hill, Tennessee, USA
No full textA detailed palynological and stratigraphic study was undertaken on the Cambrian Nolichucky Shale, Maynardville Limestone and Copper Ridge Dolomite (Conasauga Group), as exposed at Thorn Hill, northeastern Tennessee, USA. The majority of palynological samples show low abundance and diversity. Fifty two acritarch taxa (fifteen assigned to species; twenty six left in open nomenclature; eleven new forms), two problematica and four invertebrate components are described. Based upon trilobite biostratigraphy and stable carbon isotope chemostratigraphy, the stratigraphic position of the Cambrian Series 3/Furongian (Marjuman/Steptoean; Aphelaspis Zone/Crepicephalus Zone) boundary is broadly indentified within the uppermost section of the Nolichucky Shale. The first record of SPICE identified using organic residues is also reported, the onset of which is coincident with the Aphelaspis Zone/Crepicephalus Zone boundary). Recovered acritarchs have little immediate, comparative, stratigraphic value but some forms (Acritarch sp. 1 and Acritarch sp. 2) may have future potential use as biostratigraphic markers for shallow marine upper Cambrian Series 3 units. Palynofacies data and sedimentology indicate that the acritarch abundance peak in the Nolichucky Shale may represent maximum water depth within a transgressive/regressive cycle. Based on TEM analysis of vesicle wall ultrastructure, Peteinosphaeridium? sp. 1, Peteinosphaeridium? sp. 2, and Acritarch sp. 2 are interpreted as belonging to the Class Chlorophyceae. The vesicle wall ultrastructure of Acritarch sp. 1 is trilaminar, consisting of a central alveolar layer bounded by two, thin, electron dense layers and is comparable to that of diapause egg cases of extant branchiopods. Based upon wall ultrastructure, vesicle size and surface ornament, recalcitrant wall biochemistry and evidence of co-occurrence of branchiopod-type crustaceans, Acritarch sp. 1 is interpreted as being the egg case of a Cambrian branchiopod-type crustacean, and as such represents the earliest evidence for diapause-type dormancy in the fossil record
What determines euro area bank CDS spreads? National Bank of Belgium Working Paper, No. 190, May 2010
No full textThis paper decomposes the explained part of the CDS spread changes of 31 listed euro area banks according to various risk drivers. The choice of the credit risk drivers is inspired by the Merton (1974) model. Individual CDS liquidity and other market and business variables are identified to complement the Merton model and are shown to play an important role in explaining credit spread changes. Our decomposition reveals, however, highly changing dynamics in the credit, liquidity, and business cycle and market wide components. This result is important since supervisors and monetary policy makers extract different signals from liquidity based CDS spread changes than from business cycle or credit risk based changes. For the recent financial crisis, we confirm that the steeply rising CDS spreads are due to increased credit risk. However, individual CDS liquidity and market wide liquidity premia played a dominant role. In the period before the start of the crisis, our model and its decomposition suggest that credit risk was not correctly priced, a finding which was correctly observed by e.g. the International Monetary Fund
What determines euro area bank CDS spreads ?
No full textThis paper decomposes the explained part of the CDS spread changes of 31 listed euro area banks according to various risk drivers. The choice of the credit risk drivers is inspired by the Merton (1974) model. Individual CDS liquidity and other market and business variables are identified to complement the Merton model and are shown to play an important role in explaining credit spread changes. Our decomposition reveals, however, highly changing dynamics in the credit, liquidity, and business cycle and market wide components. This result is important since supervisors and monetary policy makers extract different signals from liquidity based CDS spread changes than from business cycle or credit risk based changes. For the recent financial crisis, we confirm that the steeply rising CDS spreads are due to increased credit risk. However, individual CDS liquidity and market wide liquidity premia played a dominant role. In the period before the start of the crisis, our model and its decomposition suggest that credit risk was not correctly priced, a finding which was correctly observed by e.g. the International Monetary Fundcredit default spreads, credit risk, financial crisis, financial sector, liquidity premia, structural model
