Bibliographies thématiques / Metal-based systems

Littérature scientifique sur le sujet « Metal-based systems »

Auteur : Grafiati
Publié le 18 mai 2024

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Articles de revues sur le sujet "Metal-based systems"

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Khirallah, Kareem, et Mohamed A. Swillam. « Nanoelectromechanical systems-based metal-insulator-metal plasmonics tunable filter ». Journal of Micro/Nanolithography, MEMS, and MOEMS 14, no 2 (6 avril 2015) : 025501. http://dx.doi.org/10.1117/1.jmm.14.2.025501.

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Romero-Canelón, Isolda, et Peter J. Sadler. « Systems approach to metal-based pharmacology ». Proceedings of the National Academy of Sciences 112, no 14 (30 mars 2015) : 4187–88. http://dx.doi.org/10.1073/pnas.1503858112.

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Allahverdiyeva, Kh V., N. T. Kakhramanov, M. I. Abdullin, G. S. Martynova et D. R. Nurullayeva. « RHEOLOGICAL PROPERTIES OF METAL-FILLED SYSTEMS BASED ON HIGH-DENSITY POLYETHYLENE AND ALUMINUM ». Azerbaijan Chemical Journal, no 2 (2 juin 2022) : 40–46. http://dx.doi.org/10.32737/0005-2531-2022-2-40-46.

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The paper considers the fundamental principles of the study of the rheological features of the melt flow of the initial high-density polyethylene and its filled compositions with aluminum powder, depending on the filler concentration, temperature and shear rate. To improve the compatibility of metal-polymer systems, a compatibilizer has been used, which is a graft copolymer of high-density polyethylene containing 5.6 wt. % maleic anhydride. The flow curves and the dependence of the effective viscosity on the shear rate of the initial high-density polyethylene and composites containing 0.5 wt. % and 5.0 wt. % aluminum powder has been determined. The regularity of the change in the effective viscosity of the melt on the temperature in Arrhenius coordinates has been established. Based on the curves obtained, the values of the activation energy of the viscous flow have been determined. A temperature-invariant characteristic of the composites viscosity properties has been drawn, which makes it possible to predict the change in the value of this indicator at high shear rates, close to their processing by extrusion and injection molding. The developed materials have been tested at the METAK LLC enterprise in Azerbaijan
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Hartley, Jennifer M., Jack Allen, Julia Meierl, Alexei Schmidt, Ingo Krossing et Andrew P. Abbott. « Calcium chloride-based systems for metal electrodeposition ». Electrochimica Acta 402 (janvier 2022) : 139560. http://dx.doi.org/10.1016/j.electacta.2021.139560.

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Popescu, Roxana, et Alexandru Grumezescu. « Metal Based Frameworks for Drug Delivery Systems ». Current Topics in Medicinal Chemistry 15, no 15 (22 mai 2015) : 1532–42. http://dx.doi.org/10.2174/1568026615666150414145323.

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Manuchehrabadi, Navid, Meng Shi, Priyatanu Roy, Jinbin Qiu, Feng Xu, Tian Jian Lu et John Bischof. « Metal foam based rewarming of vitrified systems ». Cryobiology 81 (avril 2018) : 231. http://dx.doi.org/10.1016/j.cryobiol.2017.12.074.

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Thomas-Gipson, Jintha, Garikoitz Beobide, Oscar Castillo, Antonio Luque, Sonia Pérez-Yáñez et Pascual Román. « Supramolecular Architectures Based on Metal-Cytosine Systems ». European Journal of Inorganic Chemistry 2017, no 10 (10 mars 2017) : 1333–40. http://dx.doi.org/10.1002/ejic.201601475.

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Bayly, Simon R., et Paul D. Beer. « ChemInform Abstract : Metal-Based Anion Receptor Systems ». ChemInform 41, no 25 (22 juin 2010) : no. http://dx.doi.org/10.1002/chin.201025196.

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Clementyev, E. S., D. A. Serebrennikov et V. V. Sikolenko. « Metal matrix composites based on valence-unstable systems ». IOP Conference Series : Materials Science and Engineering 1100, no 1 (1 février 2021) : 012040. http://dx.doi.org/10.1088/1757-899x/1100/1/012040.

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Warner, N. A. « Liquid metal systems for gasification-based power generation ». Proceedings of the Institution of Mechanical Engineers, Part A : Journal of Power and Energy 218, no 6 (septembre 2004) : 387–401. http://dx.doi.org/10.1243/0957650041761955.

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Thèses sur le sujet "Metal-based systems"

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Paul, Satadal. « Theoretical investigation of magnetic behaviour in metal-based systems ». Thesis, University of North Bengal, 2013. http://hdl.handle.net/123456789/956.

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Ma, Wei. « Low temperature metal-based micro fabrication and packaging technology / ». View abstract or full-text, 2005. http://library.ust.hk/cgi/db/thesis.pl?MECH%202005%20MA.

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Ebenhoch, Carola [Verfasser]. « Memristive Systems Based on Metal Oxide Nanowires / Carola Ebenhoch ». Konstanz : KOPS Universität Konstanz, 2021. http://d-nb.info/1237222109/34.

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Zuki, Hafiza Mohamed. « Optical multi-metal ion sensing systems based on immobilised fluorescent reagents ». Thesis, University of Manchester, 2009. http://ethos.bl.uk/OrderDetails.do?uin=uk.bl.ethos.506630.

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Zhang, Guangrui. « Systems-based modelling and optimisation of fracture toughness of metal alloys ». Thesis, University of Sheffield, 2013. http://etheses.whiterose.ac.uk/4691/.

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The modelling, prediction and prevention of material failures is the key issue during material design and processing. Finite Element Methods (FEM) combined with physically-based models are a popular approach to modelling fracture characteristics. However, in industrial practice, the interlinked process with high dimensions and complexities could be too complicated to be expressed purely on the principles of physics. Mathematical models via data-driven modelling approaches, were developed to remedy the aforementioned disadvantages of physically-based models. Therefore, this project focuses on developing a hybrid model to assess the toughness of metal alloys, and to improve the current material design techniques through the model-based optimal design. Firstly, a data-driven model of the crack propagation of compact tension test is constructed; an error compensation strategy is also developed and tested. In order to improve the current material design technique through the model-based optimal design, a multi-objective particle swarm optimisation algorithm is proposed and tested using different benchmark functions. A data-driven model based finite element model structure is then proposed. Finally, the optimisation algorithm is applied together with the finite element analysis to the optimal design of material. The results show that the constructed model for compact tension test and the error compensation strategy performed well. The proposed multi-objective particle swarm optimisation algorithm outperforms the compared two particle swarm optimisation algorithms; it is also applied successfully to the optimal design of the small punch test.
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Travan, Andrea. « Nanocomposite systems based on metal nanoparticles and polysaccharides for biomedical applications ». Doctoral thesis, Università degli studi di Trieste, 2010. http://hdl.handle.net/10077/3629.

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2008/2009
Questo lavoro riguarda lo sviluppo di materiali nanocompositi per applicazioni biomediche e si configura all’ interno del progetto europeo “Newbone” (EU-FP6); in particolare, lo scopo principale della tesi era realizzare un rivestimento biocompatibile e dotato di proprietà antibatteriche per protesi ortopediche. Sono stati preparati sistemi nanocompositi basati su un polisaccaride derivato dal chitosano (Chitlac) che permette di ottenere soluzioni colloidali di nanoparticelle (argento e oro) con proprietà antibatteriche. Parallelamente, è stato studiato un particolare meccanismo chimico di riduzione degli ioni argento ad opera dei residui di lattitolo del Chitlac; le proprietà ottiche delle nanoparticelle ottenute attraverso questo meccanismo sono state valutate attraverso spettroscopia Raman, evidenziando la possibilità di avere un incremento del segnale grazie al verificarsi dell’ effetto SERS. Essendo state riscontrate migliori proprietà biologiche del sistema a base di argento (Chitlac-nAg) rispetto a quello a base di oro in termini di efficacia antimicrobica e biocompatibilità, Chitlac-nAg è stato scelto per i successivi studi di realizzazione del rivestimento per la protesi. Test sul meccanismo antimicrobico della soluzione ChitlacnAg hanno dimostrato l’interazione tra le nanoparticelle e la membrana batterica. Allo stesso tempo, poiché la mancanza di barriere fisiche può favorire la diffusione delle nanoparticelle all’ interno delle cellule eucariote con rischio di effetti citotossici causati dalla loro internalizzazione, si è voluto realizzare delle strutture tridimensionali a base di Chitlac in grado di intrappolare le nanoparticelle. A questo scopo, sono state sfruttate le proprietà di gelificazione del polisaccaride alginato in modo da ottenere un sistema semi-solido in miscela con Chitlac-nAg; il materiale ottenuto possiede marcate proprietà antibatteriche senza però risultare tossico per le cellule eucariote, come dimostrato da test in vitro e in vivo. Questo risultato è particolarmente importante in relazione allo stato dell’ arte sull’ argomento. Poiché la parte portante della protesi è costituita da un polimero metacrilico, al fine di rivestire questo materiale di substrato è stata messa a punto una tecnica basata sull’ attivazione della superficie e successiva deposizione del rivestimento a base di Chitlac. Questa tecnica permette di ottenere un rivestimento nanocomposito costituito da nanoparticelle di argento incorporate nella matrice di Chitlac. Grazie a questo strato bioattivo la superficie della protesi acquisisce un’ efficace attività antibatterica che si manifesta quando i batteri entrano in diretto contatto con il materiale. Inoltre, test in vitro hanno dimostrato che le cellule eucariote aderiscono e proliferano sul rivestimento nanocomposito, suggerendo quindi una buona integrazione del materiale nei tessuti attorno all’ impianto. La combinazione di tali proprietà ha determinato la scelta di questo rivestimento per il test in vivo su “minipig” a conclusione del progetto europeo: questo test è al momento in via di svolgimento e da esso ci si può attendere una conferma degli incoraggianti risultati ottenuti dagli studi in vitro.
The present work is focused on the development of nanocomposite systems for biomedical applications and has been carried out in the framework of the European Project called “Newbone” (EU-FP6); in particular, the main goal of the thesis was to realize biocompatible coatings for orthopedic prosthesis endowed with antimicrobial properties. Nanocomposite systems based on a chitosan-derived polysaccharide (Chitlac) that stabilizes metal nanoparticles (silver and gold) have been prepared in colloidal solutions which possess broad spectrum antibacterial properties. As a complementary work, it was studied and defined a particular chemical mechanism of silver ions reduction carried out by the lactose moieties of Chitlac; the optical properties of the metallic nanoparticles obtained through this mechanism were tested by means of Raman spectroscopy, thus detecting considerable enhancements of the signal due to the SERS effect (Surface Enhanced Raman Scattering). Given the better biological properties of silver-based systems (Chitlac-nAg) with respect to gold in terms of antimicrobial efficacy and biocompatibility, only the former metal was chosen in the following steps towards the preparation of the nanocomposite coating for the prosthesis. Studies on the biocidal mechanism of the Chitlac-nAg solution ascribed the activity to the interaction metal-bacteria membrane. On the other hand, since the lack of physical barriers to nanoparticle diffusion into eukaryotic cells determines the risk of a massive uptake with cytotoxic outcomes, we focused our attention toward the preparation of Chitlac-based threedimensional structures entrapping silver nanoparticles. To this end, the gel forming properties of the polysaccharide alginate were exploited allowing the production of a semi-solid system in a mixture with Chitlac-nAg: this material displays potent antibacterial properties without showing cytotoxic effects towards eukaryotic cells, as verified by in vitro and in vivo tests. Such result was particularly important in relation to the state of the art in this research field. Since the core material of the prosthesis is made of methacrylic thermosets, in order to coat this substrate material we have devised a technique based on surface activation followed by deposition of the Chitlac-based layer. Such technique allows obtaining a nanocomposite coating where silver nanoparticles are entrapped within the Chitlac matrix. This bioactive layer endows the thermoset surface with considerable antimicrobial properties, as bacteria are rapidly killed upon direct contact with the material. At the same time, in vitro tests proved that eukaryotic cells adhere and proliferate on the nanocomposite coating, which indicates the possibility to have good integration of the material in the tissues surrounding the implant. The combination of these properties determined the choice of our coating for the final in vivo test in a minipig model as a conclusion of the European project; this test is in progress at the moment and it will hopefully confirm the encouraging studies in vitro.
XXII Ciclo
1981
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Naik, A. J. T. « Hetero-junction and nanomaterial systems for metal oxide semiconductor based gas sensing ». Thesis, University College London (University of London), 2015. http://discovery.ucl.ac.uk/1463687/.

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Investigations into a number of hetero-junction and nanoceramic materials systems for metal oxide semiconductor (MOS) gas sensing for potential environmental and bio-sensing applications are presented. The hetero-junction study encompasses investigations into various composite n-n hetero-contact systems such as WO3-ZnO and SnO2-ZnO and a p-n hetero-contact system, specifically CTO (Chromium Titanium Oxide) - ZnO. The facile fabrication of various arrays of hetero-junction MOS gas sensor devices has been demonstrated. A simple change in the compositional contribution of an individual metal oxide within a composite, exhibits the ability to tune the composite’s responsivity and selectivity. The hetero-junction systems were characterized by various techniques including Scanning Electron Microscopy (SEM), Raman spectroscopy, X-Ray Diffraction (XRD) and X-Ray Photoelectron Spectroscopy (XPS) and the influence of the physical and chemical properties of these materials towards the associated gas sensing properties, deduced. Further, the influence of fundamental properties of junctions such as contact potential and packing structure, towards the sensing properties, are also discussed. The nanomaterials study encompasses investigation into ZnO semiconducting oxides fabricated by various emerging fabrication technologies including Continuous Hydrothermal Flow Synthesis (CHFS) and other relatively high temperature routes. The chemical and physical properties of the nanoceramics have been investigated by various techniques including Transmission Electron Microscopy (TEM), Scanning Electron Microscopy (SEM) and Brunauer Emmett Teller (BET) surface area measurements. The investigation demonstrates emerging techniques for the production of nanomaterials, which can be successfully used in MOS gas sensing for the desired applications. Further, the study shows that the behaviour of the nanomaterials is complex and material surface area is not the only deterministic factor of enhanced responsivities, but microstructural factors such as morphology and particle size, as well as heat-treatment conditions are all influential over the overall sensing properties. This thesis presents an overview of emerging material systems for MOS gas sensing applications.
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Sidiropoulos, Themistoklis. « Enhanced light-matter interactions in laser systems incorporating metal-based optical confinement ». Thesis, Imperial College London, 2014. http://hdl.handle.net/10044/1/30831.

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The aim of plasmonics is to exploit the strong coupling between photons and collective electron oscillations in metals, so-called surface plasmon polaritons, which enable a strong confinement of the electromagnetic field to metal-dielectric interfaces. The interaction of confined optical states with electronic transitions within matter accelerates these otherwise slow light-matter interactions. This work's purpose is to investigate accelerated light-matter interactions within plasmonic lasers, which arise due to optical confinement, and how these influence laser dynamics. In particular, this work focuses on the fabrication, demonstration and characterisation of plasmonic lasers. The devices investigated in this work consist of semiconductor nanowires made from zinc oxide (ZnO) placed in the proximity of a silver substrate. In this geometry the metal allows for strong optical confinement, whereas the semiconductor delivers the necessary gain to achieve lasing. Operating at room temperature, the emission from ZnO lies near the surface plasmon frequency, where confinement and loss become maximal, leading to accelerated spontaneous recombination, gain switching and gain recovery compared with conventional - photonic - ZnO nanowire lasers. To assess the lasing dynamics, in this work a novel double-pump spectroscopy technique is used, which exploits the non-linearity of the laser process to allow the investigation of accelerated light-matter interactions. This novel technique is necessary, as the speed of plasmonic devices is too fast for electrical detection, and the emission of single devices is too weak for non-linear spectroscopic techniques. Comparing photonic and plasmonic devices reveals contrasting dynamics between both, highlighting the benefits of plasmonic confinement, but also exposing an important limitation. Plasmonic devices could potentially be faster, but are ultimately limited by internal relaxation processes of the chosen gain medium. The findings of this work will improve the understanding of plasmonic lasers and their limitations, but also lead to improved knowledge of internal semiconductor processes.
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Sorarù, Antonio. « Molecular and nanodimensional metal based systems for the therapy against neurodegenerative diseases ». Doctoral thesis, Università degli studi di Padova, 2015. http://hdl.handle.net/11577/3424628.

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Reactive oxygen species (ROS) are harmful species produced during metabolic processes, such as photosynthesis and respiration, of living organism. In both case, the substrate (oxygen/water) undergoes several multi electronic reaction, during which some electrons can “escape” from the catalytic cycle and produce ROS, such as superoxide radical anion, hydrogen peroxide, hydroxyl radical and other derivatives. These species are really dangerous, since they are able to oxidize almost all cellular components. Indeed they can damage lipids, proteins, DNA, affecting cellular functions till cell death. Under oxidative stress condition, accumulation of damage due to ROS has been supposed to play a role in several pathologies, and in particular in age-related ones, such as Alzheimer’s disease (AD). This disease is characterized by an accumulation of neurotoxic senile plaques, mainly made of short peptide monomers, that tend to aggregate into fibrils, called amyloid β peptide (Aβ). Although the mechanism involved in the production of these peptides is still unknown, some hypothesis suggest that ROS are produced within the fibrils and are responsible for further Aβ production. Nature has developed different catalytic strategies to limit ROS production, and the most important is the enzymatic pathway: superoxide dismutases (SOD) and catalase (CAT) enzymes are able to dismutate, respectively, superoxide and hydrogen peroxide. Nevertheless, in case of unpaired ROS production it is of huge interest to find new artificial systems that are able to help natural enzymes in their task. In this thesis, four different classes of synthetic enzymes (synzymes) that mimic natural anti ROS systems have been investigated: I. Isostructural mononuclear manganese complexes, with general formula [Mn(L)X2], characterized by a pentadentate ligand L, containing different heteroatoms (N, O or S) have been used for the dismutation of hydrogen peroxide and superoxide anion. Their activity, also depending on heteroatoms, and stability were studied, first in organic solvents to have a comparison with literature similar compounds, then in aqueous solution, where only few compounds were known to work. The sulfur-containing complex [Mn(L)(OTf)2] was found to exhibit high dual SOD/CAT-like activity with excellent stability, when used in the presence of a base. II. Isostructural dinuclear manganese complexes, with general formula [Mn2L2X], were widely studied as artificial catalases. A comparison with other dimanganese complexes, in terms of Michealis-Menten parameter, KM and kcat, was performed. Superoxide dismutase activity was also evaluated, demonstrating the unique dual SOD/CAT behavior of [Mn2L2X] with respect to other dinuclear complexes. Finally, the ligands were modified with mitochondriotropic functionalities. In particular, two fluorescent rhodamine derivatives and a triphenylphosphonium salt, were taken into account. III. Some multimetallic manganese oxoclusters, containing 6-13 manganese atoms, were synthetized during a Short Term Scientific Mission in Dublin, in the group of Prof. Wolfgang Schmitt. The catalase-like activity of these compounds was tested for the first time. Their H2O2 dismutation capability was thus demonstrated and their stability in aqueous environment was checked. Preliminary test as SOD mimics were also performed. IV. In the end, a completely inorganic compound, a polyoxometalate (POM) substituted with four ruthenium atoms, with formula [Ru4O4(OH)2(H2O)4(γ-SiW10O36)2]10-, able to dismutate hydrogen peroxide was studied. Its activity in different biological buffers and media was initially optimized. Its capability of interaction with Aβ peptides, coupled with its catalase activity, were exploited to control these two major events involved in Alzheimer’s disease. Preliminary test on neuronal cells were then performed (with Dr.ssa de Bartolo (ITM-CNR, Rende, CS)), confirming the interesting properties of the compound in vitro and finding a very low toxicity. Finally, encapsulation of POM was achieved in order to enables delivery and targeting in cells, using polymeric multilayer biocompatible microcapsules in which POM is deposited. The presence of POM and its catalytic activity were confirmed and analyzed.
Le reazioni biochimiche che coinvolgono il trasferimento di elettroni dall’ossigeno per dare acqua, durante la respirazione cellulare, e dall’acqua per dare ossigeno, durante la fotosintesi, possono portare alla formazione di specie reattive dell’ossigeno (ROS, reactive oxygen species), dovute alla “perdita” di elettroni dal ciclo catalitico. Tra queste specie troviamo inizialmente il superossido O2-•, l’acqua ossigenata e il radicale ossidrile. Queste possono reagire con altre molecole per dare origine ad altre specie reattive, per esempio dell’azoto, ma soprattutto possono danneggiare peptidi, lipidi e DNA e causare ingenti danni alle funzioni cellulari fino a portare alla morte della cellula stessa. In condizioni di stress ossidativo, l’accumulo di queste specie sembra giocare un importante ruolo nelle malattie degenerative, come ad esempio il morbo di Alzheimer (AD). In questo caso, la malattia è caratterizzata dalla presenza di aggregati proteici in forma di placche, che hanno un effetto neurotossico. Questi accumuli proteici sono costituiti principalmente da peptidi di 40-42 amminoacidi chiamati β-amiloidi (Aβ), che tendono ad aggregare, in forma di fibrille. Le cause della formazione e accumulo di questi peptidi non sono ancora del tutto chiare, ma si hanno evidenze sul coinvolgimento delle ROS nella fase di formazione dei peptidi, e sull’aumento della loro produzione, dopo la formazione delle fibre, a causa di reazioni mediate dai metalli intrappolate nelle fibre stesse. La natura ha sviluppato dei sistemi per proteggersi da queste specie reattive, tra questi citiamo gli enzimi superossido dismutasi (SOD) e catalasi (CAT), capaci rispettivamente di eliminare superossido e acqua ossigenata, che tuttavia in certe situazioni di elevato stress ossidativo possono risultare insufficienti per prevenire i danni. È quindi di estremo interesse lo studio di composti artificiali capaci di aiutare gli enzimi naturali nel loro compito di eliminare le ROS dall’ambiente biologico. Considerando ciò, in questa tesi sono state considerate le seguenti quattro classi di composti, utilizzati come enzimi sintetici (synzymes), per imitare le funzioni dei sistemi anti ROS naturali: I. Complessi mononucleari ed isostrutturali di manganese, di formula generale [Mn(L)X2], caratterizzati da un legante pentadentato, L, contenente differenti eteroatomi (N, O, o S), sono stati studiati nella dismutazione dell’acqua ossigenata e del radicale anione superossido. L’attività è stata inizialmente analizzata in solvente organico (acetonitrile) per aver dei termini di paragone con altri composti di letteratura. In seguito l’attività è stata studiata anche in acqua, dove solo pochi composti di letteratura sono risultati attivi. Se utilizzati in presenza di base, i complessi [Mn(L)(OTf)2] contenenti zolfo mostrano una duplice attività SOD/CAT ed un’elevata stabilità. II. Complessi dinucleari ed isostrutturali di manganese, di formula generale [Mn2L2X], sono stati studiati inizialmente per l’eliminazione dell’acqua ossigenata. Un confronto con simili composti di letteratura è stato effettuato tramite il calcolo dei parametri, derivati dall’ equazione di cinetica enzimatica di Michalis-Menten, KM e kcat. E’ stata anche analizzata la capacità di smaltire il superossido, dimostrando le caratteristiche uniche di [Mn2L2X] nella duplice attività CAT/SOD, in ambiente acquoso, rispetto ad altri complessi dinucleari. Infine, modificando i leganti, si è cercato di introdurre nuove funzionalità adatte alla veicolazione del composto in cellula. In particolare, sono stati utilizzati residui organici noti per la loro affinità verso i mitocondri, come i derivati della rodamina e i sali di trifenilfosfonio. III. Sono stati studiati oxoclusters multimetallici di manganese, contenti 6-13 atomi di metallo, sintetizzati durante un Short Term Scientific Mission (STSM, COST action CM1203) a Dublino, presso il laboratorio del Prof. Wolfgang Schmitt, analizzandone per la prima volta l’attività di dismutazione dell’ acqua ossigenata e del superossido, oltre che la stabilità in soluzioni acquose. IV. Un composto completamente inorganico, un poliossometallato (POM) contenete quattro atomi di rutenio, di formula [Ru4O4(OH)2(H2O)4(γ-SiW10O36)2]10-, è considerato per la sua solubilità in ambiente acquoso e la capacità di dismutare efficacemente l’acqua ossigenata. L’attività è stata analizzata in diversi tamponi e mezzi comunemente usati per analisi di sistemi biologici. In soluzione, il complesso è capace di ridurre la produzione di ROS e anche di interagire con peptidi amiloidei, evitandone l’aggregazione in fibrille, dimostrandosi quindi promettente nel contrastare due importanti eventi che si verificano durante la malattia di Alzheimer. In collaborazione con la Dr.ssa de Bartolo (ITM-CNR, Rende, CS) sono state quindi effettuate prove preliminari in cellule neuronali, per verificare sia la tossicità del composto (che risulta essere nulla anche a 100µM di concentrazione) che l’effettiva attività anti-ROS e anti-amiloidogenica in vitro. Infine si è studiato l’inserimento del POM all’interno della shell di microcapsule polimeriche multistrato, con la prospettiva di controllarne la veicolazione in cellula.
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Koo, Yiu, et 顧耀. « Synthesis of metal-containing thiophene-based conjugated polymers for photovoltaic applications ». Thesis, The University of Hong Kong (Pokfulam, Hong Kong), 2009. http://hub.hku.hk/bib/B41897262.

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Livres sur le sujet "Metal-based systems"

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Crichton, Robert R. Metal-based neurodegeneration : From molecular mechanisms to therapeutic strategies. 2e éd. Chichester, West Sussex, U.K : John Wiley & Sons, 2013.

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J, Ward Roberta, dir. Metal-based neurodegeneration : From molecular mechanisms to therapeutic strategies. Chichester : J. Wiley & Sons, 2006.

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IEEE International Workshop on Defect Based Testing (2000 Montréal, Québec). 2000 IEEE International Workshop on Defect Based Testing : April 30, 2000, Montreal, Canada : proceedings. Los Alamitos, Calif : IEEE Computer Society, 2000.

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Qian, Limin. Soft X-Ray Spectroscopic Study of Fullerene Based Transition-Metal Compounds and Related Systems. Uppsala Universitet, 2001.

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Crichton, R., Robert Crichton et Roberta Ward. Metal-Based Neurodegeneration. Wiley & Sons, Incorporated, John, 2006.

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Rodríguez, Clara Guglieri. Relationship Between Structure and Magnetic Behaviour in ZnO-Based Systems. Springer, 2015.

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Rodríguez, Clara Guglieri. Relationship Between Structure and Magnetic Behaviour in ZnO-Based Systems. Springer, 2015.

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Mu, Rentao. Construction and Reactivity of Pt-Based Bi-component Catalytic Systems. Springer, 2017.

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Mu, Rentao. Construction and Reactivity of Pt-Based Bi-component Catalytic Systems. Springer, 2018.

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Crichton, Robert, et Roberta Ward. Metal-Based Neurodegeneration : From Molecular Mechanisms to Therapeutic Strategies. Wiley & Sons, Limited, John, 2006.

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Chapitres de livres sur le sujet "Metal-based systems"

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Korotcenkov, Ghenadii. « Metal-Based Nanostructures ». Dans Integrated Analytical Systems, 73–91. New York, NY : Springer New York, 2013. http://dx.doi.org/10.1007/978-1-4614-7388-6_4.

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Korotcenkov, Ghenadii. « Metal Oxide-Based Nanostructures ». Dans Integrated Analytical Systems, 47–71. New York, NY : Springer New York, 2013. http://dx.doi.org/10.1007/978-1-4614-7388-6_3.

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Spolenak, Ralph, Ehrenfried Zschech, Manfred Weihnacht, Joachim Schumann, Claus M. Schneider, Hermann Mai et Stefan Braun. « Thin Film Systems : Basic Aspects ». Dans Metal Based Thin Films for Electronics, 7–120. Weinheim, FRG : Wiley-VCH Verlag GmbH & Co. KGaA, 2005. http://dx.doi.org/10.1002/3527602534.ch2.

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Arseenko, Mariia, Julie Gheysen, Florent Hannard, Nicolas Nothomb et Aude Simar. « Self-Healing in Metal-Based Systems ». Dans Engineering Materials and Processes, 43–78. Cham : Springer International Publishing, 2021. http://dx.doi.org/10.1007/978-3-030-86880-2_3.

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Spolenak, Ralph, Horst Wendrock, Klaus Wetzig, Ehrenfried Zschech, Siegfried Menzel, Claus M. Schneider, Hartmut Vinzelberg et al. « Challenges for Thin Film Systems Characterization and Optimization ». Dans Metal Based Thin Films for Electronics, 205–316. Weinheim, FRG : Wiley-VCH Verlag GmbH & Co. KGaA, 2005. http://dx.doi.org/10.1002/3527602534.ch4.

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Ratha, Satyajit, et Aneeya Kumar Samantara. « Metal Chalcogenide-Based Electrochemical Capacitors ». Dans Electrochemical Energy Conversion and Storage Systems for Future Sustainability, 1–55. Includes bibliographical references and index. : Apple Academic Press, 2020. http://dx.doi.org/10.1201/9781003009320-1.

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Korotcenkov, Ghenadii. « Metal Oxide-Based Nanocomposites for Conductometric Gas Sensors ». Dans Integrated Analytical Systems, 197–207. New York, NY : Springer New York, 2013. http://dx.doi.org/10.1007/978-1-4614-7388-6_14.

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Laakso, Sampsa, Jaakko Peltokorpi, Juho Ratava, Mika Lohtander et Juha Varis. « Graph-Based Analysis of Metal Cutting Parameters ». Dans Advances in Sustainable and Competitive Manufacturing Systems, 627–36. Heidelberg : Springer International Publishing, 2013. http://dx.doi.org/10.1007/978-3-319-00557-7_52.

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Savchenko, Maxim A., et Alexei V. Stefanovich. « Spin Glasses Based on Rare-Earth Metal Compounds ». Dans Fluctuational Superconductivity of Magnetic Systems, 133–68. Berlin, Heidelberg : Springer Berlin Heidelberg, 1990. http://dx.doi.org/10.1007/978-3-642-74287-3_7.

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Nishihara, Hiroshi. « Redox-Based Functionalities of Multinuclear Metal Complex Systems ». Dans Frontiers in Transition Metal-Containing Polymers, 369–97. Hoboken, NJ, USA : John Wiley & Sons, Inc., 2006. http://dx.doi.org/10.1002/9780470086063.ch9.

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Actes de conférences sur le sujet "Metal-based systems"

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Pullanchiyodan, Abhilash, Libu Manjakkal et Ravinder Dahiya. « Metal Coated Fabric Based Supercapacitors ». Dans 2020 IEEE International Conference on Flexible and Printable Sensors and Systems (FLEPS). IEEE, 2020. http://dx.doi.org/10.1109/fleps49123.2020.9239537.

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Roy, S., C. K. Sarkar et P. Bhattacharyya. « ZnO nanoflake based metal-insulator-metal methane sensor for underground coalmine application ». Dans 2012 International Conference on Communications, Devices and Intelligent Systems (CODIS). IEEE, 2012. http://dx.doi.org/10.1109/codis.2012.6422196.

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Koyama, Asuto, Tetsuo Kan, Eiji Iwase, Kiyoshi Matsumoto et Isao Shimoyama. « Force sensor based on metal nanoparticle ». Dans 2010 IEEE 23rd International Conference on Micro Electro Mechanical Systems (MEMS). IEEE, 2010. http://dx.doi.org/10.1109/memsys.2010.5442475.

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Kim, Daeyoung, Jun Hyeon Yoo, Yunho Lee, Wonjae Choi, Koangki Yoo et Jeong-Bong Lee. « Gallium-based liquid metal inkjet printing ». Dans 2014 IEEE 27th International Conference on Micro Electro Mechanical Systems (MEMS). IEEE, 2014. http://dx.doi.org/10.1109/memsys.2014.6765804.

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Hosseini, Amir, Hamid Nejati et Yehia Massoud. « A Metal-Insulator-Metal based two-dimensional triangular lattice photonic band-gap structure ». Dans 2007 Joint 50th IEEE International Midwest Symposium on Circuits and Systems (MWSCAS) and the IEEE Northeast Workshop on Circuits and Systems (NEWCAS 2007). IEEE, 2007. http://dx.doi.org/10.1109/mwscas.2007.4488780.

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Sun, Haoran, Xiaomei Lin et Jingjun Lin. « Comparison of SP-LIBS and DP-LIBS on metal and non-metal testing based on LIBS ». Dans Laser Components, Systems, and Applications, sous la direction de Lan Jiang, Shibin Jiang, Lijun Wang et Long Zhang. SPIE, 2017. http://dx.doi.org/10.1117/12.2284622.

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Anderson, P. R. G., A. R. A. McLelland et P. J. Ward. « Thixoforming of Aluminium-Based Metal Matrix Composite Systems ». Dans International Congress & Exposition. 400 Commonwealth Drive, Warrendale, PA, United States : SAE International, 1994. http://dx.doi.org/10.4271/940812.

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Roy, Harshit, Arkaprova Ray et Bibhu Datta Sahoo. « Deterministic Dither Based Mismatch Characterization of Wide Range of Metal-Oxide-Metal Capacitors ». Dans 2020 IEEE 63rd International Midwest Symposium on Circuits and Systems (MWSCAS). IEEE, 2020. http://dx.doi.org/10.1109/mwscas48704.2020.9184450.

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Madzik, Mateusz, Elangovan Elamurugu et Jaime Viegas. « Metal oxide thin film transistor based sensing ». Dans 2016 IEEE 59th International Midwest Symposium on Circuits and Systems (MWSCAS). IEEE, 2016. http://dx.doi.org/10.1109/mwscas.2016.7870044.

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Boi, Mauro, Daniele Battaglia, Andrea Salimbeni et Alfonso Damiano. « Energy Storage Systems Based on Sodium Metal Halides Batteries ». Dans 2019 IEEE Energy Conversion Congress and Exposition (ECCE). IEEE, 2019. http://dx.doi.org/10.1109/ecce.2019.8913257.

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Rapports d'organisations sur le sujet "Metal-based systems"

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Wenz, Tracy Renee. A transport based one-dimensional perturbation code for reactivity calculations in metal systems. Office of Scientific and Technical Information (OSTI), février 1995. http://dx.doi.org/10.2172/27061.

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Chiang, Tai C. Electronic Struture and Quantum Effects of Thin Metal Film Systems Based on Silicon Carbide. Fort Belvoir, VA : Defense Technical Information Center, mai 2013. http://dx.doi.org/10.21236/ada577620.

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Vesely, Charles, Paul Barnard et Bal Dosanjh. Metal-Supported Ceria Electrolyte-based SOFC Stack for Scalable, Low‐Cost, High‐Efficiency and Robust Stationary Power Systems. Office of Scientific and Technical Information (OSTI), mars 2021. http://dx.doi.org/10.2172/1772925.

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Ianakiev, Kiril D. SNM Movement Detection / Radiation Sensors and Advanced Materials Portfolio Review RadSensing2011 6Li-Metal Based Neutron Detector Systems for Replacing 3He Gas Proportional Counters. Office of Scientific and Technical Information (OSTI), mars 2013. http://dx.doi.org/10.2172/1072253.

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Kimble, Tyron. PR-575-183603-R01 Performance of External Profiling Inspection. Chantilly, Virginia : Pipeline Research Council International, Inc. (PRCI), janvier 2019. http://dx.doi.org/10.55274/r0011553.

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Previous efforts have shown that the laser/light based NDE systems do generally provide sufficiently accurate measurements for validating MFL ILI. However, the specific samples studied lack metrics associated with large metal loss areas or areas of interacting metal loss. It is generally accepted that the performance would deteriorate in such conditions, but a comprehensive evaluation has not been performed. This project aims to provide an insight into the performance of these technologies as pertaining to the measurement of larger or interacting areas of metal loss on pipelines.
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Corriveau, L., J. F. Montreuil, O. Blein, E. Potter, M. Ansari, J. Craven, R. Enkin et al. Metasomatic iron and alkali calcic (MIAC) system frameworks : a TGI-6 task force to help de-risk exploration for IOCG, IOA and affiliated primary critical metal deposits. Natural Resources Canada/CMSS/Information Management, 2021. http://dx.doi.org/10.4095/329093.

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Australia's and China's resources (e.g. Olympic Dam Cu-U-Au-Ag and Bayan Obo REE deposits) highlight how discovery and mining of iron oxide copper-gold (IOCG), iron oxide±apatite (IOA) and affiliated primary critical metal deposits in metasomatic iron and alkali-calcic (MIAC) mineral systems can secure a long-term supply of critical metals for Canada and its partners. In Canada, MIAC systems comprise a wide range of undeveloped primary critical metal deposits (e.g. NWT NICO Au-Co-Bi-Cu and Québec HREE-rich Josette deposits). Underexplored settings are parts of metallogenic belts that extend into Australia and the USA. Some settings, such as the Camsell River district explored by the Dene First Nations in the NWT, have infrastructures and 100s of km of historic drill cores. Yet vocabularies for mapping MIAC systems are scanty. Ability to identify metasomatic vectors to ore is fledging. Deposit models based on host rock types, structural controls or metal associations underpin the identification of MIAC-affinities, assessment of systems' full mineral potential and development of robust mineral exploration strategies. This workshop presentation reviews public geoscience research and tools developed by the Targeted Geoscience Initiative to establish the MIAC frameworks of prospective Canadian settings and global mining districts and help de-risk exploration for IOCG, IOA and affiliated primary critical metal deposits. The knowledge also supports fundamental research, environmental baseline assessment and societal decisions. It fulfills objectives of the Canadian Mineral and Metal Plan and the Critical Mineral Mapping Initiative among others. The GSC-led MIAC research team comprises members of the academic, private and public sectors from Canada, Australia, Europe, USA, China and Dene First Nations. The team's novel alteration mapping protocols, geological, mineralogical, geochemical and geophysical framework tools, and holistic mineral systems and petrophysics models mitigate and solve some of the exploration and geosciences challenges posed by the intricacies of MIAC systems. The group pioneers the use of discriminant alteration diagrams and barcodes, the assembly of a vocab for mapping and core logging, and the provision of field short courses, atlas, photo collections and system-scale field, geochemical, rock physical properties and geophysical datasets are in progress to synthesize shared signatures of Canadian settings and global MIAC mining districts. Research on a metamorphosed MIAC system and metamorphic phase equilibria modelling of alteration facies will provide a foundation for framework mapping and exploration of high-grade metamorphic terranes where surface and near surface resources are still to be discovered and mined as are those of non-metamorphosed MIAC systems.
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Cadieu, Fred J. Systematics of Permanent Magnet Film Texturing and the Limits of Film Synthesized 1-12 and 2-17 Iron Based Rare Earth Transition Metal Permanent Systems. Fort Belvoir, VA : Defense Technical Information Center, janvier 1998. http://dx.doi.org/10.21236/ada344282.

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Chefetz, Benny, Baoshan Xing, Leor Eshed-Williams, Tamara Polubesova et Jason Unrine. DOM affected behavior of manufactured nanoparticles in soil-plant system. United States Department of Agriculture, janvier 2016. http://dx.doi.org/10.32747/2016.7604286.bard.

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The overall goal of this project was to elucidate the role of dissolved organic matter (DOM) in soil retention, bioavailability and plant uptake of silver and cerium oxide NPs. The environmental risks of manufactured nanoparticles (NPs) are attracting increasing attention from both industrial and scientific communities. These NPs have shown to be taken-up, translocated and bio- accumulated in plant edible parts. However, very little is known about the behavior of NPs in soil-plant system as affected by dissolved organic matter (DOM). Thus DOM effect on NPs behavior is critical to assessing the environmental fate and risks related to NP exposure. Carbon-based nanomaterials embedded with metal NPs demonstrate a great potential to serve as catalyst and disinfectors. Hence, synthesis of novel carbon-based nanocomposites and testing them in the environmentally relevant conditions (particularly in the DOM presence) is important for their implementation in water purification. Sorption of DOM on Ag-Ag₂S NPs, CeO₂ NPs and synthesized Ag-Fe₃O₄-carbon nanotubebifunctional composite has been studied. High DOM concentration (50mg/L) decreased the adsorptive and catalytic efficiencies of all synthesized NPs. Recyclable Ag-Fe₃O₄-carbon nanotube composite exhibited excellent catalytic and anti-bacterial action, providing complete reduction of common pollutants and inactivating gram-negative and gram-positive bacteria at environmentally relevant DOM concentrations (5-10 mg/L). Our composite material may be suitable for water purification ranging from natural to the industrial waste effluents. We also examined the role of maize (Zeamays L.)-derived root exudates (a form of DOM) and their components on the aggregation and dissolution of CuONPs in the rhizosphere. Root exudates (RE) significantly inhibited the aggregation of CuONPs regardless of ionic strength and electrolyte type. With RE, the critical coagulation concentration of CuONPs in NaCl shifted from 30 to 125 mM and the value in CaCl₂ shifted from 4 to 20 mM. This inhibition was correlated with molecular weight (MW) of RE fractions. Higher MW fraction (> 10 kDa) reduced the aggregation most. RE also significantly promoted the dissolution of CuONPs and lower MW fraction (< 3 kDa) RE mainly contributed to this process. Also, Cu accumulation in plant root tissues was significantly enhanced by RE. This study provides useful insights into the interactions between RE and CuONPs, which is of significance for the safe use of CuONPs-based antimicrobial products in agricultural production. Wheat root exudates (RE) had high reducing ability to convert Ag+ to nAg under light exposure. Photo-induced reduction of Ag+ to nAg in pristine RE was mainly attributed to the 0-3 kDa fraction. Quantification of the silver species change over time suggested that Cl⁻ played an important role in photoconversion of Ag+ to nAg through the formation and redox cycling of photoreactiveAgCl. Potential electron donors for the photoreduction of Ag+ were identified to be reducing sugars and organic acids of low MW. Meanwhile, the stabilization of the formed particles was controlled by both low (0-3 kDa) and high (>3 kDa) MW molecules. This work provides new information for the formation mechanism of metal nanoparticles mediated by RE, which may further our understanding of the biogeochemical cycling and toxicity of heavy metal ions in agricultural and environmental systems. Copper sulfide nanoparticles (CuSNPs) at 1:1 and 1:4 ratios of Cu and S were synthesized, and their respective antifungal efficacy was evaluated against the pathogenic activity of Gibberellafujikuroi(Bakanae disease) in rice (Oryza sativa). In a 2-d in vitro study, CuS decreased G. fujikuroiColony- Forming Units (CFU) compared to controls. In a greenhouse study, treating with CuSNPs at 50 mg/L at the seed stage significantly decreased disease incidence on rice while the commercial Cu-based pesticide Kocide 3000 had no impact on disease. Foliar-applied CuONPs and CuS (1:1) NPs decreased disease incidence by 30.0 and 32.5%, respectively, which outperformed CuS (1:4) NPs (15%) and Kocide 3000 (12.5%). CuS (1:4) NPs also modulated the shoot salicylic acid (SA) and Jasmonic acid (JA) production to enhance the plant defense mechanisms against G. fujikuroiinfection. These results are useful for improving the delivery efficiency of agrichemicals via nano-enabled strategies while minimizing their environmental impact, and advance our understanding of the defense mechanisms triggered by the NPs presence in plants.
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Brent Marquis. A Sensor System Based on Semi-Conductor Metal Oxide Technology for In Situ Detection of Coal Fired Combustion Gases. Office of Scientific and Technical Information (OSTI), mai 2007. http://dx.doi.org/10.2172/944414.

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Chauhan, Vinod. L52307 Remaining Strength of Corroded Pipe Under Secondary Biaxial Loading. Chantilly, Virginia : Pipeline Research Council International, Inc. (PRCI), août 2009. http://dx.doi.org/10.55274/r0010175.

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Corrosion metal-loss is one of the major damage mechanisms to transmission pipelines worldwide. Several methods have been developed for assessment of corrosion defects, such as ASME B31G, RSTRENG and LPC. These methods were derived based on experimental tests and theoretical/numerical studies of the failure behavior of corroded pipelines subjected only to internal pressure loading. In the vast majority of cases, internal pressure loading will be the main loading mechanism on the pipeline. However, there may be instances when pipelines could also be subjected to significant loading from the environment. For onshore pipelines, these additional loads could be as a result of ground movement due to landslides, mining subsidence, or even seismic activity. In the case of offshore pipelines the formation of free spans may impose significant bending loads. For instance, seabed scour can lead to the development and growth of free spans of pipelines resting on the seabed, particularly if they are not trenched. Whilst, the guidance detailed in standard assessment methods will be sufficient in the majority of cases, it may be inappropriate or non-conservative to use it in cases when the pipeline may also be subjected to significant external loading. As a result, this work focus on : The remaining strength of corroded pipelines subject to internal pressure and external loading cannot be explicitly assessed using the ASME B31G, RSTRENG and LPC assessment methods. However, these assessment methods have been validated using pipe with real corrosion and simulated (machined) defects welded to dome ends to form a pressure vessel and subsequently failed under internal pressure loading. Consequently, existing methods include some inherent biaxial loading and the remaining strength of corroded pipelines can be assessed with a limited amount of external loading. Ground movement due to landslides can impose significant external loading to transmission pipelines. Stresses in pipelines due to landslides can be greater than the stresses due to internal pressure loading. Methods developed by the nuclear industry for assessing corroded pipework are given in ASME Code Case N-597-2 and based on ASME B31G when the axial extent of wall thinning is limited. For more extensive corrosion, the assessment methods are based on branch reinforcement and local membrane stress limits. Strictly the methods given in ASME Code Case N-597-2 are only applicable to the assessment of piping systems designed to the ASME Boiler and Pressure Vessel Code, Section III. Failure loci of pipelines with isolated corrosion defects and subjected to combined loads have been derived for common pipeline geometries and materials. The failure loci have been validated using tests performed on 457.2mm (18-inch) and 1219.2mm (48-inch) diameter pipe under combined bending/pressure loading. These failure loci can be used to assess the limit of acceptability of existing assessment methods such as ASME B31G and RSTRENG under combined loading conditions.
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