Search results for "Turing"
showing 10 items of 2644 documents
Heavy metal sorption in biosorbents – Using spent grain from the brewing industry
2019
The sorption properties of brewer's spent grain (BSG) were assessed in terms of its usefulness in removing heavy metals from solutions. The specific objectives of the investigation involved studying sorption equilibrium and kinetics, assessing the influence of other cations on sorption efficiency, and examining the possibility of bed regeneration. The studies were carried out in a static system, with a constant ratio of solution volume to biosorbent mass, and using a flow through system. The affinity of metal cations to BSG functional groups was established and increased in the series: Mn2þzZn2þ < Ni2þ < Cd2þ < Cu2þ < Pb2þ. The BSG's sorption capacities (mmol g�1), determined using the Lang…
Study of the implementation of SPIF as a Reshaping strategy in terms of formability and accuracy performance
2022
The adaption of circular economy strategies has become increasingly necessary in current times. Researches need to be addressed on finding alternative processes or the modification of the existing processes in order to reprocess End-of-Life (EoL) components and consequently recover both materials and their functions. This research paper focuses on the use of single point incremental forming (SPIF) process for the Reshaping of sheet metal EoL components. Uniaxial and biaxial pre-straining was performed on AA5754 sheets to imitate an end-of-life component, and SPIF operations were carried out so as to obtain reshaped components. In previous works, the authors have proven the technical feasibi…
The role of thermal contribution in the design of AA2024 friction stir welded butt and lap joints: mechanical properties and energy demand
2022
Although in recent times the use of solid-state welding processes as friction stir welding (FSW) has become increasingly widespread, for some joint morphologies, as lap joints, there are still signifcantly less data available on both process parameters optimization and energy consumption. In the present paper, the authors investigated the possibility of enhancing the joint quality in two diferent confgurations, i.e. lap and butt joints, taking into account specifc thermal contribution (STC) conferred to the weld. Strength, micro-hardness and microstructure were evaluated on the produced AA2024 aluminum alloys butt and lap joints. The surface response method (RSM) was used to investigate the…
Identification of linear parameter varying models
2002
We consider identification of a certain class of discrete-time nonlinear systems known as linear parameter varying system. We assume that inputs, outputs and the scheduling parameters are directly measured, and a form of the functional dependence of the system coefficients on the parameters is known. We show how this identification problem can be reduced to a linear regression, and provide compact formulae for the corresponding least mean square and recursive least-squares algorithms. We derive conditions on persistency of excitation in terms of the inputs and scheduling parameter trajectories when the functional dependence is of polynomial type. These conditions have a natural polynomial i…
Symmetric boundary element method versus finite element method
2002
The paper examines the effectiveness of the symmetric boundary element formulation when the continuum body is subdivided into large elements called macro-elements. The approach proposed combines a strong reduction of variables with an elastic solution close to the real response. Indeed, if the displacement method is used, this approach permits one to determine for every macro-element a relationship connecting the weighted traction vector defined on the sides of the interface boundary with the node displacement vector of the same boundary and with the external action vector. Such a strategy is very similar to that followed through the finite element method, but with the advantages of having …
Residual stress and material flow prediction in Friction Stir Welding of Gr2 Titanium T-joints
2022
Friction Stir Welding is nowadays an established technique successfully used by many industries. However, most of the research and, consequently, most of the applications regard aluminum alloys and butt joints. T-joints are of high interest for different industrial sectors as aeronautical, aerospace, naval and ground transportation, for which joint integrity and low residual stress are extremely important. In this study, an experimental and numerical approach is proposed with the aim to study the peculiarities of the residual stress distribution and material flow occurring in FSW of CP-Ti T-joints. Experiments were carried out to assess the feasibility of the process and to acquire the temp…
ITO top-electrodes via industrial-scale PLD for efficient buffer-layer-free semitransparent perovskite solar cells
2022
The deposition of transparent conductive oxides (TCO) usually employs harsh conditions that are frequently harmful to soft/organic underlayers. Herein, successful use of an industrial pulsed laser deposition (PLD) tool to directly deposit indium tin oxide (ITO) films on semitransparent vacuum-deposited perovskite solar cells without damage to the device stack is demonstrated. The morphological, electronic, and optical properties of the PLD deposited ITO films are optimized. A direct relation between the PLD chamber pressure and the solar cell performance is obtained. The semitransparent perovskite solar cells prepared exclusively by vacuum-assisted techniques had fill factors of 78% and exc…
Wine competition: from between-juries consistency to sensory perception of consumers
2015
Wine is a complex product offering to consumer a multitude of choices. Considering this diversity, wine competitions provide a way of helping consumers in their choices. However, the dramatic increase of wine contests in the last fifteen years has led to an increase in the number of award-winning wines. Is a medal really a guarantee of quality or having a medal is just a matter of chance? Two studies were therefore conducted during 3 years in a French wine competition. The first study assessed the impact of the order in which the wine was assessed, and the variability between juries’ judgements and therefore the chances of winning an award. For this purpose, the same wine was placed on all …
Towards farm-level health management of offshore wind farms for maintenance improvements
2015
This paper studies a conceptual architecture for health management of offshore wind farms. To this aim, various necessary enablers of a health management sys- tem are presented to improve reliability and availability while optimizing maintenance costs. The main focus lies on improving existing condition monitoring systems based on concepts of condition-based maintenance and relia- bility centered maintenance. A brief review of the rel- evant state-of-the-art is presented and gaps to be filled towards realization of such health management system are discussed.
Economic transitions in finis terra
2009
A gradualist approach has been taken in describing the evolution of the last foragers in the Iberian Mediterranean Region (IMR) up to their rapid collapse, brought about by the appearance of the first prehistoric farmers. This point of view assumes that the post-Last Glaical Maximum (LGM) climatic change brought about a certain restructuring of the mammal fauna and exerted a direct influence by flooding the changing coastal plain and submerging coastal sites related to marine resource use. This paper proposes that small prey was a constant and structural resource in the IMR that did not signal intensification, since human consumption of rabbits goes back to the Middle Palaeolithic. At the s…