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Journal articles on the topic "CuII system"
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Amendola, Valeria, Massimo Boiocchi, Yuri Diaz Fernandez, Carlo Mangano, and Piersandro Pallavicini. "A Solvent-Dependent and Electrochemically Controlled Self-Assembling/Disassembling System." Collection of Czechoslovak Chemical Communications 68, no. 9 (2003): 1647–62. http://dx.doi.org/10.1135/cccc20031647.
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The bis-bidentate ligand R,S-1,2-diphenyl-N,N'-bis(2-quinolinemethylidene)ethane-1,2-diamine (ligand 4), containing two (iminomethyl)quinoline moieties separated by a cis-1,2-diphenylethylene spacer, forms stable complexes with both CuI and CuII. With CuII, the monomeric 1:1 complex [CuII(4)]2+ is obtained both in CH3CN and CH2Cl2. With CuI and overall 1:1 metal/ligand molar ratio, an equilibrium mixture is obtained in CH3CN, consisting of [CuI(4)2]+, [CuI2(4)2]2+ and [CuI2(4)(CH3CN)4]2+. The preponderant species is the two-metal one-ligand "open" complex [CuI2(4)(CH3CN)4]2+, in which each Cu+ cation is coordinated in a tetrahedral fashion by one (iminomethyl)quinoline unit and by two CH3CN molecules. Precipitation from the equilibrium mixture yields only crystals of [CuI2(4)(CH3CN)4](ClO4)2·2CH3CN, whose crystal and molecular structures have been determined. On the other hand, in the poorly coordinating CH2Cl2 solvent, only the dimeric helical [CuI2(4)2]2+ complex is obtained, when the overall metal/ligand 1:1 molar ratio is chosen. Addition of large quantities of acetonitrile to solutions of [CuI2(4)2]2+ in dichlorometane results in the formation of [CuI2(4)(CH3CN)4]2+, i.e. in the solvent-driven disassembling of the CuI helicate. While electrochemistry in CH3CN is poorly defined due to the presence of more than one CuI species, cyclic voltammetry experiments carried out in CH2Cl2 revealed a well defined behavior, with irreversible oxidation of [CuI2(4)2]2+ and irreversible reduction of [CuII(4)]2+ taking place at separate potentials (∆E ≈ 700 mV). Irreversibility and separation of the redox events are due to the self-assembling and disassembling processes following the reduction and oxidation, respectively.
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Rogers, Ciaran, Deepak Asthana, Adam Brookfield, et al. "Modelling Conformational Flexibility in a Spectrally Addressable Molecular Multi-Qubit Model System." Angewandte Chemie Internation Edition 61, no. 45 (2022): e202207947. https://doi.org/10.1002/anie.202207947.
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Dipolar coupled multi-spin systems have the potential to be used as molecular qubits. Herein we report the synthesis of a molecular multi-qubit model system with three individually addressable, weakly interacting, spin 1=2 centres of differing g-values. We use pulsed Electron Paramagnetic Resonance (EPR) techniques to characterise and separately address the individual electron spin qubits; CuII, Cr7Ni ring and a nitroxide, to determine the strength of the inter-qubit dipolar interaction. Orientation selective Relaxation-Induced Dipolar Modulation Enhancement (os-RIDME) detecting across the CuII spectrum revealed a strongly correlated CuII-Cr7Ni ring relationship; detecting on the nitroxide resonance measured both the nitroxide and CuII or nitroxide and Cr7Ni ring correlations, with switchability of the interaction based on differing relaxation dynamics, indicating a handle for implementing EPR-based quantum information processing (QIP) algorithms.
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Benari, MD, and GT Hefter. "Electrochemical Characteristics of the Copper(II)-Copper(I) Redox Couple in Dimethyl Sulfoxide Solutions." Australian Journal of Chemistry 43, no. 11 (1990): 1791. http://dx.doi.org/10.1071/ch9901791.
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A study of the electrochemical characteristics of the copper(II)/copper(I) redox couple has been made in chloride and bromide media in dimethyl sulfoxide (Me2SO) and their aqueous analogues. The formal potentials of the CuII/CuI couple in the Me2SO media are approximately 0.15 V less positive than in their aqueous counterparts probably due to a combination of solvation and complexation effects. Diffusion coefficients for both CuI and CuII are 5-10 times lower in Me2SO than in H2O as a result of the higher viscosity of Me2SO solutions. Heterogeneous electron-transfer rate constants for the CuII/CuI system on platinum are also an order of magnitude smaller than in aqueous solution. In general the electrochemical characteristics of the CuII/CuI system parallel those reported elsewhere for the FeIII/FeII couple. However, a detailed investigation of the CuII/CuI system by cyclic voltammetry indicates that the overall electrode process is complex, probably involving a quasi-reversible electron-transfer step coupled to a rate-determining loss of Cl - from CuII.
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Bobonazarzoda, Gulruhsor, Jahongul Davlatshoeva, Mubashirhon Rakhimova, Mahmurod Guriev, and Farida Miraminzoda. "Complexation processes of CuII with imidazole." From Chemistry Towards Technology Step-By-Step 6, no. 1 (2025): 81–87. https://doi.org/10.52957/2782-1900-2025-6-1-81-87.
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The purpose of the study is to investigate the complexation process in the heterogeneous Cu(0)-Cu(II)-imidazole-water system by the classical Clark-Nikolsky oxidation potential method at a temperature of 288.15 K and a solution ionic strength of 1.0 mol/L. The authors found the formation of the following coordination compounds in this system: [Cu(HL)2]3+, [CuHL(OH)]2+, [Cu(HL)2(OH)]2+, [Cu2(HL)2(OH)2]4+, [Cu2(HL)2(OH)3]3+. The complexation process proceeds in a rather wide pH range from 1.0 to 10.5.
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Chruscinska, Elzbieta, Eugenio Garribba, Giovanni Micera, and Daniele Sanna. "Hydrolytic and Dinuclear Species Formed by Copper(II) with Di-, Tri- and Tetra-peptides Containing Proline in the Second Position." Journal of Chemical Research 23, no. 3 (1999): 240–41. http://dx.doi.org/10.1177/174751989902300335.
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Walger, Elsa, Nathalie Marlin, Gérard Mortha, Florian Molton, and Carole Duboc. "Hydroxyl Radical Generation by the H2O2/CuII/Phenanthroline System under Both Neutral and Alkaline Conditions: An EPR/Spin-Trapping Investigation." Applied Sciences 11, no. 2 (2021): 687. http://dx.doi.org/10.3390/app11020687.
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The copper–phenanthroline complex CuI(Phen)2 was the first artificial nuclease studied in biology. The mechanism responsible for this activity involves CuII(Phen)2 and H2O2. Even if H2O2/Cu systems have been extensively studied in biology and oxidative chemistry, most of these studies were carried out at physiological pH only, and little information is available on the generation of radicals by the H2O2/CuII-Phen system. In the context of paper pulp bleaching to improve the bleaching ability of H2O2, this system has been investigated, mostly at alkaline pH, and more recently at near-neutral pH in the case of dyed cellulosic fibers. Hence, this paper aims at studying the production of radicals with the H2O2/CuII-Phen system at near-neutral and alkaline pHs. Using the EPR/spin-trapping method, HO• formation was monitored to understand the mechanisms involved. DMPO was used as a spin-trap to form DMPO–OH in the presence of HO•, and two HO• scavengers were compared to identify the origin of the observed DMPO–OH adduct, as nucleophilic addition of water onto DMPO leads to the same adduct. H2O2 decomposition was enhanced by the addition of CuII–Phen (and only slightly by addition of CuSO4), reaching a level similar to the Fenton reagent at near-neutral pH. This evidences the role of Phen, which improves the effect of CuII by tuning the electronic structure and structural properties of the corresponding CuII complexes.
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Dalecki, Alex G., Mehri Haeili, Santosh Shah, et al. "Disulfiram and Copper Ions Kill Mycobacterium tuberculosis in a Synergistic Manner." Antimicrobial Agents and Chemotherapy 59, no. 8 (2015): 4835–44. http://dx.doi.org/10.1128/aac.00692-15.
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ABSTRACTTuberculosis is a severe disease affecting millions worldwide. Unfortunately, treatment strategies are hampered both by the prohibitively long treatment regimen and the rise of drug-resistant strains. Significant effort has been expended in the search for new treatments, but few options have successfully emerged, and new treatment modalities are desperately needed. Recently, there has been growing interest in the synergistic antibacterial effects of copper ions (CuII/I) in combination with certain small molecular compounds, and we have previously reported development of a drug screening strategy to harness the intrinsic bactericidal properties of CuII/I. Here, we describe the copper-dependent antimycobacterial properties of disulfiram, an FDA-approved and well-tolerated sobriety aid. Disulfiram was inhibitory to mycobacteria only in the presence of CuII/Iand exerted its bactericidal activity well below the active concentration of CuII/Ior disulfiram alone. No other physiologically relevant bivalent transition metals (e.g., FeII, NiII, MnII, and CoII) exhibited this effect. We demonstrate that the movement of the disulfiram-copper complex across the cell envelope is porin independent and can inhibit intracellular protein functions. Additionally, the complex is able to synergistically induce intracellular copper stress responses significantly more than CuII/Ialone. Our data suggest that by complexing with disulfiram, CuII/Iis likely allowed unfettered access to vulnerable intracellular components, bypassing the normally sufficient copper homeostatic machinery. Overall, the synergistic antibacterial activity of CuII/Iand disulfiram reveals the susceptibility of the copper homeostasis system ofMycobacterium tuberculosisto chemical attacks and establishes compounds that act in concert with copper as a new class of bacterial inhibitors.
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Yogesh, Kumar, Sharda, Garg Ashish, and Pandey Rajayashree. "Polarographic behavior of CuII-theophylline complex." Journal of Indian Chemical Society Vol. 87, Oct 2010 (2010): 1231–34. https://doi.org/10.5281/zenodo.5804927.
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Electrochemical Laboratory, Department of Chemistry, University of Rajasthan, Jaipur-302 055, Rajasthan, India <em>E-mail:</em> yogesh.kmar@yahoo.com <em>Manuscript received 24 December 2009, revised 6 April 2010, accepted 13 April 2010</em> The Cu<sup>II</sup>-theophylline complex is best formed at pH 4.5. The Cu<sup>II</sup>-theophylline complex formed is in 1 : 1 ratio. The system is irreversible and the kinetic and thermodynamic parameters have been determined.
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Cini, Renzo, Rebecca Pogni, Riccardo Basosi, et al. "Oxygen Radical Scavenger Activity, EPR, NMR, Molecular Mechanics and Extended-Hückel Molecular Orbital Investigation of the Bis(Piroxicam)Copper(II) Complex." Metal-Based Drugs 2, no. 1 (1995): 43–56. http://dx.doi.org/10.1155/mbd.1995.43.
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The oxygen radical scavenger activity (ORSA) of [CuII(Pir)2] (HPir = Piroxicam = 4-hydroxy -2- methyl -N-2- pyridyl -2H- 1,2-benzothiazine -3- carboxamide 1,1-dioxide) was determined by chemiluminescence of samples obtained by mixing human neutrophils (from healthy subjects) and [CuII(Pir)2(DMF)2] (DMF = N,N -dimethylformammide) in DMSO/GLY/PBS (2:1:2, v/v) solution (DMSO = dimethylsulfoxide, GLY = 1,2,3-propantriol, PBS = Dulbecco’s buffer salt solution). The ratio of the residual radicals, for the HPir (1.02·10−4M) and [CuII(Pir)2(DMF)2] (1.08·10−5M) /HPir (8.01·10−5M) systems was higher than 12 (not stimulated) [excess of piroxicam was added (Cu/Pir molar ratio ≈1:10) in order to have most of the metal complexed as bischelate]. In contrast, the ratio of residual radicals for the CuCl2 (1.00·10−5M) and [CuII(Pir)2(DMF)2] (1.08·10−5M)/Hpir (8.01·10−5M)system was 5. The [CuII(Pir)2] compound is therefore a stronger radical scavenger than either HPir or CuCl2. A molecular mechanics (MM) analysis of the gas phase structures of neutral HPir, its zwitterionic (HPir+-) and anionic (Pir-) forms, and some CuII-piroxicam complexes based on X-ray structures allowed calculation of force constants. The most stable structure for HPir has a ZZZ conformation similar to that found in the CuII (and CdII complexes) in the solid state as well as in the gas phase. The structure is stabilized by a strong H bond which involves the N(amide)-H and O(enolic) groups. The MM simulation for the [CuII(Pir)2(DMF)2] complex showed that two high repulsive intramolecular contacts exist between a pyridyl hydrogen atom of one Pir- molecule with the O donor of the other ligand. These interactions activate a transition toward a pseudo-tetrahedral geometry, in the case the apical ligands are removed. On refluxing a suspension of [CuII(Pir)2(DMF)2] in acetone a brown microcystalline solid with the Cu(Pir)2·0.5DMF stoichiometry was in fact prepared. C13 spin-lattice relaxation rates of neutral, zwitterionic and anionic piroxicam, in DMSO solution are explained by the thermal equilibrium between the three most stable structures of the three forms, thus confirming the high quality of the force field. The EPR spectrum of [CuII(Pir)2(DMF)2] (DMSO/GLY, 2:1, v/v, 298 and 110 K) agrees with a N2O2+O2 pseudo-octahedral coordination geometry. The EPR spectrum of CuII(Pir)2·0.5DMF agrees with a pseudo-tetrahedral coordination geometry. The parameters extracted from the room temperature spectra of the solution phases are in agreement with the data reported for powder and frozen solutions. The extended-Hückel calculations on minimum energy structures of [CuII(Pir)2(DMF)2] and [CuII(Pir)2] (square planar) revealed that the HOMOs have a relevant character of dx2−y2. On the other hand the HOMO of a computer generated structure for [CuII(Pir)2] (pseudo-tetrahedral) has a relevant character of dxy atomic orbital. A dxy orbital is better suited to allow a dπ-pπ interaction to the O2- anion. Therefore this work shows that the anti-inflammatory activity of piroxicam could be due in part to the formation of [CuII(Pir)2] chelates, which can exert a SOD-like activity.
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Marino, Nadia, Francesc Lloret, Miguel Julve, and Giovanni De Munno. "Chemical and Structural Versatility in the Copper/2,2′-Bipyrimidine/Iodide System: A Regular Alternating Mixed-Valent Cu(II)-Cu(I) Chain Showing Unusually Similar Metal Coordination Environments." Magnetochemistry 11, no. 3 (2025): 20. https://doi.org/10.3390/magnetochemistry11030020.
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The reaction in reagent grade acetone of copper(II) nitrate hexahydrate, 2,2′-bipyrimidine (bpm) and potassium iodide in a 1:2:2 molar ratio afforded three different products: an unreduced Cu(II) species, a fully reduced Cu(I) species and a mixed-valent Cu(II)/Cu(I) species. Of these, only the unreduced Cu(II) complex of formula [CuII(bpm)3](I3)(I) (1) could be structurally characterized, the other two products being initially only isolated as amorphous powders. X-ray quality, beautifully shaped, quasi-black prismatic crystals of compound 2, namely {[CuI(I3)CuII(I)(bpm)2](I3)}n, and brick-reddish parallelepipeds of compound 3, namely {[CuI2 (μ-I)2(bpm)]}n, were successively obtained through the slow diffusion in H-shaped tubes of aqueous solutions of the three reagents, after extensive optimization of the crystallization conditions. Compound 1 consists of a rare tris(2,2′-bipyrimidine)copper(II) monomeric dication, charge balanced by both iodide and triiodide anions. Compound 3, whose structure as well as optical and photocatalytic properties were recently disclosed, consists of a regular alternating μ-bpm/di-μ-iodide copper(I) chain. Finally, compound 2 consists of a rare, regular alternating mixed-valent Cu(II)-Cu(I) μ-bpm copper chain, showing unusual similarities in the metal coordination environment. The magnetic properties of compound 2 remarkably reveal a very weak antiferromagnetic coupling between the paramagnetic Cu(II) ions which are well separated both intra- and inter-chain.
Dissertations / Theses on the topic "CuII system"
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Hagaman, Bruce M. "A prototype expert system to forecast typhoon conditions at Cubi Point, Philippines." Thesis, Monterey, California. Naval Postgraduate School, 1988. http://hdl.handle.net/10945/23099.
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A prototype expert system is designed to forecast the tropical cyclone related winds that may be used to set Conditions of Readiness (COR) at Cubi Point, Philippines. One set of rules modifies the storm position and strength forecasts to account for terrain interactions while crossing the Philippines. A second set estimates the local winds given the modified storm position and intensity. Tests using an independent storm set indicate the terrain-modified positions are comparable in accuracy to current Joint Typhoon Warning Center forecasts. However, the reduction of storm intensity due to terrain is underestimated and the westward translation of the storm is reduced too much. Finally, the conservative strategy of using worst-case wind gust estimates also contributes to an overprediction of the local winds and thus the COR. COR estimates are only 32% accurate, with a 95% capture rate for winds over 35 kt but a 70% false alarm rate due to overforecast of winds under 35 kt. More dynamic/statistical study appears to be required to refine the terrain- modification algorithm. Empirical rules form expert forecaster should be included in future systems. Theses. (fr)
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Souissy, Hassane. "Système automatique de zonage et inspection des cuirs." Valenciennes, 1988. https://ged.uphf.fr/nuxeo/site/esupversions/751e1220-f675-4b23-9ceb-d79d6f0fc722.
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Le système automatique requiert 2 aspects: le zonage expert de l'image d'une peau; l'inspection adaptée de chaque zone de l'image. On propose une technique de zonage automatique adaptée à la taille et à la forme de la peau et une méthode d'analyse adaptée au matériau d'aspect perturbé qui est le cuir.
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Magnúsdóttir, Bergrún Tinna. "Estimation and optimal designs for multi-response Emax models." Doctoral thesis, Stockholms universitet, Statistiska institutionen, 2014. http://urn.kb.se/resolve?urn=urn:nbn:se:su:diva-102888.
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This thesis concerns optimal designs and estimation approaches for a class of nonlinear dose response models, namely multi-response Emax models. These models describe the relationship between the dose of a drug and two or more efficacy and/or safety variables. In order to obtain precise parameter estimates it is important to choose efficient estimation approaches and to use optimal designs to control the level of the doses administered to the patients in the study. We provide some optimal designs that are efficient for estimating the parameters, a subset of the parameters, and a function of the parameters in multi-response Emax models. The function of interest is an estimate of the best dose to administer to a group of patients. More specifically the dose that maximizes the Clinical Utility Index (CUI) which assesses the net benefit of a drug taking both effects and side-effects into account. The designs derived in this thesis are locally optimal, that is they depend upon the true parameter values. An important part of this thesis is to study how sensitive the optimal designs are to misspecification of prior parameter values. For multi-response Emax models it is possible to derive maximum likelihood (ML) estimates separately for the parameters in each dose response relation. However, ML estimation can also be carried out simultaneously for all response profiles by making use of dependencies between the profiles (system estimation). In this thesis we compare the performance of these two approaches by using a simulation study where a bivariate Emax model is fitted and by fitting a four dimensional Emax model to real dose response data. The results are that system estimation can substantially increase the precision of parameter estimates, especially when the correlation between response profiles is strong or when the study has not been designed in an efficient way.<br><p>At the time of the doctoral defence the following papers were unpublished and had a status as follows: Paper 1: Manuscript; Paper 2: Manuscript; Paper 3: Manuscript; Paper 4: Manuscript.</p>
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Cui, Xinguang [Verfasser], and Eva [Akademischer Betreuer] Gutheil. "CFD Study of the Flow Field and Particle Dispersion and Deposition in the Upper Human Respiratory System / Xinguang Cui ; Betreuer: Eva Gutheil." Heidelberg : Universitätsbibliothek Heidelberg, 2012. http://d-nb.info/1179784979/34.
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Augustsson, Malin. "Inte så dum som den ser ut : Artificiell intelligens och användarvänlighet i interaktiva system." Thesis, Uppsala universitet, Institutionen för informatik och media, 2017. http://urn.kb.se/resolve?urn=urn:nbn:se:uu:diva-331127.
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Artificiell intelligens och maskininlärning i interaktiva system används allt mer och av allt fler. Det innebär nya utmaningar för god interaktionsdesign och användarvänlighet. I denna studie har en flerfallsstudie gjorts av fyra olika typer av sådana system. Flerfallsstudien har gjorts medelst intervjuer och en observationsstudie utefter en frågeställning utformad för att ta reda på vad som påverkar användarvänligheten i intelligenta interaktiva system. Empirin har analyserats kvalitativt med hjälp av ramverken PACT (People, Activities, Contexts, Technologies) med stöd av Normans 7 Designprinciper. Resultaten av studien ger nya perspektiv på hur människor interagerar med intelligenta system och visar att AI kan ha många positiva effekter för användarvänligheten i interaktiva system men också att det i en del situationer kan innebära stora utmaningar för teknologi och samhälle att göra intelligenta system användarvänliga.
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Whistance-Smith, Wallace John. "An exploration of the facilitating effects of graphical user interfaces (GUI) and character user interfaces (CUI) on the design of expert systems." Thesis, National Library of Canada = Bibliothèque nationale du Canada, 1997. http://www.collectionscanada.ca/obj/s4/f2/dsk3/ftp04/nq45835.pdf.
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Shen, Wenting. "Supramolecular assembly of π-systems using bimetallic CuI-clip bearing organophosporous ligands : control of the sold state organization in crystals and on surfaces". Rennes 1, 2010. http://www.theses.fr/2010REN1S078.
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La polyvalence d’un clip de (CuI)2 basé sur des ligands phosphorés et utilisé afin de contrôler l’organisation à l’état solide d’assemblages supramoléculaires variés des systèmes-π a été étudiée dans ce travail. Le chapitre I présente les résultats obtenus afin de construire des analogues supramoléculaires variés de [2,2]paracyclophanes en interaction πà partir de connecteurs totalement π-conjugués ayant différentes natures et topologies. Dans les chapitres II et III, nous avons étudié les effets de variations structurales centrées sur les systèmes-π. Nous avons ainsi introduit des chaînes aliphatiques flexibles dans le squelette des connecteurs π-conjugués afin d’examiner le rôle joué par les fragments π-conjugués lors de la construction d’édifices étendus en interaction π et utilisé des systèmes π monotopiques. Le dernier chapitre présente les études AFM préliminaires de l’organisation sur surface de certains des assemblages en interaction décrits dans ce travail<br>The versatility of (CuI)2-clip bearing organophosphorous ligands in order to control the solid state organization of a variety of π-stacked supramolecular assemblies with cyano-capped π-systems has been investigated in this work. The Chapter I presents the results we had in order to build various π-stacked supramolecular analogues of [2,2]paracyclophanes based on fully π-conjugated linkers having different nature and topology. In the Chapter II and Chapter III, we present investigations we made focused on structural variation of the π-systems. We introduce “flexible” aliphatic chains in the core of the π-conjugated linkers to investigate the role of the π-systems to obtain long range π-stacked organization (Chapter II) and use monotopic π-conjugated systems (Chapter III). The last chapter presents the preliminary AFM studies of organization on surfaces of some of the π-stacked assemblies described in this work
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Chang, Che Chun, and 張哲鈞. "Study of Anisotropic Interface Magnetoresistance of Fe, Co, Ni, CuNi and Pt, Pd Combination Multilayered System." Thesis, 2013. http://ndltd.ncl.edu.tw/handle/51265496522226845172.
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碩士<br>國立政治大學<br>應用物理研究所<br>101<br>Ferromagnetic metallic materials show anisotropic magnetoresistance (AMR) effect, that is the resistivity measured with current parallel to the applied magnetic field is larger than perpendicular to the applied magnetic field. In thin films with current in the plane, there are two directions for applying perpendicular magnetic field, one is field in plane, the other is field perpendicular to the plane. The magnetoresistance measured with three current-field relative directions were named longitudinal (L), transverse (T), and perpendicular (P) MR. In single ferromagnet Co and Ni films, the TMR is larger than PMR, which is named “Geometric Size Effect (GSE)”. However, in Co/Pt ferromagnet material/normal metal (FM/NM) multilayered systems, the behavior of PMR larger than TMR was observed and named “Anisotropic Interface Magnetoresistance (AIMR)” by Kobs et al. in 2011.
In this thesis, we focus on the FM/NM multilayered systems and the influence of the interface in AMR effect. The FM and NM layers were Fe, Co, Ni, CuNi and Pt, Pd, Cu respectively. Both total thicknesses of FM and NM layers were fixed at 100 nm. We varied the numbers of FM/NM bilayer from 4 to 80. The XRD patterns were used to confirm the thickness and quality of our samples. In the MR measurements, the AIMR effect was observed in all samples, and the AIMR ratio increases when the interface number increases. An unusual behavior in Ni/Pt, Ni/Pd, CuNi/Pd, and Ni/Cu multilayers was observed, the perpendicular MR is larger than longitudinal MR. In addition, the anisotropic fields and saturation moments were measured by the SQUID. No apparent correlation between the unusual MR and magnetic properties was found.
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Ou, Sin-Liang, and 歐信良. "Study of the Mo/Si bilayer and CuSi system recording thin films for write-once optical disc." Thesis, 2010. http://ndltd.ncl.edu.tw/handle/79347840487913113701.
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博士<br>臺灣大學<br>材料科學與工程學研究所<br>98<br>Recently, the methods to increase data storage of optical disc inclouding of blue laser optical recording, super resolution near field structure, multilayer, multi-level, holographic data storage, etc, and the blue laser optical recording was developed more rapidily than the others.
In this study, metal induced crystallization (MIC) mechanism for alloy and bilayer structure of inorganic recording thin films was investigated. The Mo(7 nm)/Si(7 nm) bilayer, CuSi(16 nm), Si(1.5~8 nm)/CuSi(16 nm) bilayer and Ge(1.5~8 nm)/CuSi(16 nm) bilayer recording films were prepared by magnetron sputtering. Thermal analysis shows that the Mo(7 nm)/Si(7 nm) bilayer films have one phase transition step, which temperature is occurred at 250 oC ~450 oC. The CuSi(16 nm) film has one phase transition step, which temperature is occurred 180 oC ~310 oC. The Si(1.5~8 nm)/CuSi(16 nm) bilayer films have two phase transition steps, which temperatures are occurred at 170 oC ~250 oC and 300 oC ~350 oC. The Ge(1.5~8 nm)/CuSi(16 nm) bilayer films have two phase transition steps, which are occurred at 150 oC ~280 oC and 300 oC ~440 oC. The TEM analysis shows that the as-deposited Mo(7 nm)/Si(7 nm) bilayer film is amorphous, and it would transform to the hexagonal MoSi2 phase after annealing at 300 oC for 20 mins. After annealing at 500 oC for 20 mins, it would transform to the hexagonal MoSi2 and cubic Mo3Si coexisting phases. The as-deposited CuSi(16 nm) film has Cu3Si phase, and it would transform to the Cu3Si and cubic Si coexisting phases after annealing at 300 oC for 20 mins. The as-deposited Si(1.5~8 nm)/CuSi(16 nm) bilayer films have Cu3Si phase, and it would transform to the Cu3Si and cubic Si coexisting phases after annealing at 300 oC for 20 mins. The grain size of cubic Si phase increases after annealing at 500 oC for 20 mins, and the hexagonal Si phase would be formed. The as-deposited Ge(1.5~8 nm)/CuSi(16 nm) bilayer films have Cu3Si phase, and it would transform to the Cu3Si, Cu3Ge and cubic Si coexisting phases after annealing at 300 oC for 20 mins. After annealing at 500 oC for 20 mins, it would transform to the Cu3Si, Cu3Ge, cubic Si and cubic Ge coexisting phases, and the amount of cubic Si phase decreases with the increasing of the Ge layer thickness. The dynamic tests show that the jitter value of Mo(7 nm)/Si(7 nm) bilayer film is 6.5% under 1X BD recording situation and 6.8% under 4X BD recording situation. The jitter value of CuSi(16 nm) film is 8.9% under 1X BD recording situation. On the other hand, the jitter values of Si/CuSi bilayer films are 7.5%, 5.2%, and 7.9% under 1X BD recording situation as the Si layer thickness are 1.5 nm, 3 nm, and 6nm, respectively. The jitter values of Ge/CuSi bilayer films are 7.5%, 7.6%, and 11.4% under 1X BD recording situation as the Ge layer thickness are 1.5 nm, 3 nm, and 6nm, respectively.
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Zhang, Yuepeng. "Multi-state system in a fault tree analsis of a nuclear based thermochemical hydrogen plant." Thesis, 2008. http://hdl.handle.net/10155/14.
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Nuclear-based hydrogen generation is a promising way to supply hydrogen for this large market in the future. This thesis focuses on one of the most promising methods, a thermochemical Cu-Cl cycle, which is currently under development by UOIT, Atomic Energy of Canada Limited (AECL) and the Argonne National Laboratory (ANL).
The safety issues of the Cu-Cl cycle are addressed in this thesis. An investigation of major accident scenarios shows that potential tragedies can be avoided with effective risk analysis and safety management programs. As a powerful and systematic tool, fault tree analysis (FTA) is adapted to the particular needs of the Cu-Cl system. This thesis develops a new method that combines FTA with a reliability analysis tool, multi-state system (MSS), to improve the accuracy of FTA and also improve system reliability.<br>UOIT
Books on the topic "CuII system"
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Hagaman, Bruce M. A prototype expert system to forecast typhoon conditions at Cubi Point, Philippines. Naval Postgraduate School, 1989.
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Ambrosi, Eugenio. Nella misura in cui--: Il linguaggio sindacale. Edizioni lavoro, 1987.
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translator, Yuke, ed. Fan cui ruo: Cong bu que ding xing zhong huo yi. Citic Press, 2014.
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Yue, Juanli. Zhongguo jin rong ti xi cui ruo xing yu jin rong wen ding zheng ce yan jiu: A study on the financial system fragility and financial stability policy of China. Jing ji ke xue chu ban she, 2016.
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Xi, Yongkai. Bai yin xian jing: Jin dai Zhongguo bai yin he xin xing huo bi ti xi cui ruo xing gen yuan ji ying xiang = Silver trap : the source and effect of the fragile monetary system with silver as the core in modern China. Zhongguo she hui ke xue chu ban she, 2020.
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Whistance-Smith, Wallace John. An exploration of the facilitating effects of graphical user interfaces (GUI) and character user interfaces (CUI) on the design of expert systems. 1997.
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Kaese, Peter-Michael. Experimentelle, röntgenographische und thermische Untersuchungen über die Systeme AgI/HgI2, CuI/HgI2, Ag2HgI4/Cu2HgI4 und AgI/CuI/HgI2: Anharmonische Verfeinung der Strukturen der Randphasen. 1993.
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Payne, John. A New and Complete System of Universal Geography: Describing Asia, Africa, Europe and America; With Their Subdivisions of Republics, States, Empires, ... of Each Country; Cities, Towns, and Curi. Arkose Press, 2015.
Find full textBook chapters on the topic "CuII system"
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Kahn, Olivier. "Magnetic Ordering of MnII CuII Bimetallic Systems: Design of Molecular Ferromagnets." In Organic and Inorganic Low-Dimensional Crystalline Materials. Springer US, 1987. http://dx.doi.org/10.1007/978-1-4899-2091-1_7.
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Fujiyoshi, Mamoru, Akio Fujiyoshi, Akiko Osawa, Yusuke Kuroda, and Yuta Sasaki. "Development of Synchronized CUI and GUI for Universal Design Tactile Graphics Production System BPLOT3." In Lecture Notes in Computer Science. Springer International Publishing, 2014. http://dx.doi.org/10.1007/978-3-319-08599-9_4.
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Bellanca, Nicolò, and Luca Pardi. "Ritirata sostenibile! I tanti modi con cui possiamo adattarci al cambiamento." In Studi e saggi. Firenze University Press, 2020. http://dx.doi.org/10.36253/978-88-5518-195-2.16.
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This Chapter examines the paths along which we humans could create an economy within planetary boundaries. To prevent the contraction of human activities from translating into a traumatic collapse, we should accept that contraction and indeed accelerate it. The negative impact on us would be greater, in fact, if we tried to stave off the decline, or slow it down. Given this paradox, the Chapter discusses how to support the return of socio-economic metabolism to the borders. In particular, it examines interventions at the individual, national and supranational level; mercantile policies; forms of collective and mutual action; measures that leverage systemic turning points. Finally, it thinks about how the relationship between humans and the environment is changing in terms of mutual "resonance".
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Yu, Wei, and Yun Yang. "Research on User Experience Design of Cross-Border E-commerce Platform Based on CUBI Model and NPS Index in the Context of Expanding Import: A Case Study of KaoLa." In Advances in Intelligent Systems and Computing. Springer International Publishing, 2019. http://dx.doi.org/10.1007/978-3-030-19135-1_52.
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Simon, Gaël. "Les habitants et l’eau dans la ville de Vendôme du xe au xve s. : entre usages et structuration de l’espace." In L’eau dans les villes d’Europe au Moyen Âge (IVe-XVe siècle) : un vecteur de transformation de l’espace urbain. Fédération pour l’édition de la Revue archéologique du Centre de la France, 2023. https://doi.org/10.4000/1377o.
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Vendôme est ce que l’on peut nommer une « petite Venise », dont le réseau hydraulique relativement dense et complexe (plus de 11 km de canaux sur une distance de 2,3 km entre la première et la dernière dérivation du Loir à son apogée au xviie s.) s’est mis en place progressivement et principalement entre la fin du xe s. et la fin du xve s. Le creusement de ces nombreux canaux répondait à des besoins divers et variés tels que l’installation de systèmes de défense aux xe, xie et xiiie s., l’utilisation de la puissance motrice de l’eau pour les sept moulins du xie s. et les dix-sept du xve s., les ressources halieutiques, la fabrication du cuir ou encore la lutte contre les crues fréquentes. Ce réseau et ses usages ne résultent pas d’une seule autorité, mais d’une multitude d’acteurs aux intérêts divers qui semblent négocier au jour le jour leur usage. Le dossier vendômois permet également d’enrichir les études sur la fabrique urbaine et plus précisément sur la résilience des formes comme celle des paléochenaux en montrant comment la forme d’un paléochenal du Loir s’est transmise sur plusieurs millénaires en étant constamment réactivée pour des fonctions diverses et successives (fossés de lutte contre les inondations, système de défense, approvisionnement des moulins, etc.).
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Nakagawa N., Lo C.C.H., and Shen Y. "Corrosion Under Insulation: Electromagnetic NDE Capabilities." In Studies in Applied Electromagnetics and Mechanics. IOS Press, 2009. https://doi.org/10.3233/978-1-60750-023-0-5.
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Industrial systems such as chemical plants use extensive piping systems for transporting hazardous materials and pressure. Their integrity must be maintained stringently against degradations such as corrosion. According to Ref. [1], &ldquo;chemical process system components are often made of carbon steel or steel alloys, and are covered with insulation.&rdquo; Insulation may trap moisture underneath, causing &ldquo;corrosion under insulation (CUI). This refers only to damage occurring between the inside layer of the insulation and the outside surface of the metal components.&rdquo; Generally, piping may develop flaws such as cracks, pitting, local thin areas (LTAs), and blisters, among which CUI tend to form pits and LTAs on the outside surface [2]. Thus, characteristically, damages of CUI are local, the size ranging from much smaller than the pipe diameter to similar to the diameter.
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Langdon, Christoph Schlueter, and Alexander Hars. "Open Source Software Business Models and Customer Involvement Economics." In Software Applications. IGI Global, 2009. http://dx.doi.org/10.4018/978-1-60566-060-8.ch113.
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This chapter is focused on the business economics of open source. From a strategic perspective, open source falls into a category of business models that generate advantages based on customer and user involvement (CUI). While open source has been a novel strategy in the software business, CUI-based strategies have been used elsewhere before. Since the success of e-commerce and ebusiness, CUI-based strategies have become far more prevalent for at least two reasons: Firstly, advances in information technology and systems have improved feasibility of implementation of CUI strategies and secondly, CUI-based economics appear to have often become a requirement for e-business profitability. This chapter presents a review of CUI-based competition, clearly delineates CUI antecedents and business value consequences, and concludes with a synopsis of managerial implications and a specific focus on open source.
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Hess Gabriel Immanuel, Fricker Guillaume, and Denecke Kerstin. "Improving and Evaluating eMMA's Communication Skills: A Chatbot for Managing Medication." In Studies in Health Technology and Informatics. IOS Press, 2019. https://doi.org/10.3233/978-1-61499-961-4-101.
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In previous work, a mobile application for medication self-management (eMMA) was introduced. It contained a basic conversational user interface (CUI). In this work, we extended the CUI by integrating the chatbot framework RiveScript and an instruction interface. To study task success, dialog quality and efficiency, we performed a theoretical and a quantitative evaluation as well as a usability test. The results show that the technical extensions of eMMA were useful to improve the chatbot's quality. However, the underlying knowledge base still requires substantial extensions before the system can be used in practice.
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Maulana, Irwin. "Optimizing the Inspection of Corrosion Under Insulation in Badak LNG Plant by the Implementation of Risk-Based Method." In Asset Integrity Management of Critical Infrastructure. ASME, 2024. http://dx.doi.org/10.1115/1.887738_ch16.
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Corrosion-Under-Insulation (CUI) remains as one of major problem within Badak LNG plant, as equipment failure due to this phenomenon contributes to lots of material damages and losses of process fluids. It has led the company to establish several inspection strategies to mitigate the corrosion which attacks the insulated equipment and piping systems. Within its operational years, Badak LNG had sequentially implemented both condition-based monitoring and time-based action as the way to combat CUI. Recently, the company proposed a well-known risk-based inspection (RBI) as an adaptive yet reactive method to manage the shortcomings of both previous strategies. This is intended to optimize the inspection of vulnerable assets to CUI failure as the method could help ‘better’ in determining which equipment and its specific locations that prone to fail due to CUI. RBI allows integrity engineers to ‘choose’ the inspection effectiveness based on the optimization among several criteria: budget availability for inspection and maintenance, plant operational status, specific time and duration for inspection and also risk tolerance. Hence, RBI could optimize the inspection program for CUI within Badak LNG plant, as it helps prioritizing the selection of vulnerable equipment based on its risk of failure.
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Pearce, Scott. "History Writing and Its Discontents." In Northern Wei (386-534). Oxford University PressNew York, 2023. http://dx.doi.org/10.1093/oso/9780197600399.003.0002.
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Abstract Chapter 2 examines the relationship between the lords of Northern Wei, Inner Asian interlopers in the Chinese world, and the long-established Chinese historiographical tradition, with its own deeply entrenched moral system and worldview. For those who accepted the tradition, its overseers—the “text masters” or Ru—exercised significant authority, as spokesmen for a vision of what the world should be. More practically, it was they who controlled what was at this time the only form of written recordkeeping available in East Asia. Bringing with them no written system of their own, the *Taghbach (Ch. Tuoba) lords depended on Chinese scribes to run the empire. But the scribes—the text masters—brought with them much more than simple accounting. And those who recorded events based on their own worldview could be in real danger: this chapter discusses the fate of Cui Hao, an official and historian of Emperor Taiwu, who in 450 was put to death for writing in his history—perhaps quite unintentionally—of the dynasty’s “unseemly affairs.”
Conference papers on the topic "CuII system"
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Bock, Peter P. "Service Life, Reliability and Reparability of Systems for Preventing Corrosion Under Insulation." In CORROSION 2012. NACE International, 2012. https://doi.org/10.5006/c2012-01661.
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Abstract There are currently several competitive protective coating systems commonly considered for use in hot, cyclic carbon steel operating equipment which is to be insulated (CUI, Corrosion Under Insulation Service). Performance characteristics of these different coating systems overlap, but vary significantly in ways which can become important (and costly) during the service life of a system. This paper compares the initial and long term costs, performance characteristics, expected service life as well as ease of repair of these CUI systems using lab test results and field performance experience obtained from users, third-party labs and vendors of the various systems. Service life of any CUI system is strongly affected by quality of surface preparation, quality of application, and by local conditions during the service life, but the coating system largely determines the cost of repair or replacement, and whether at initial failure the service life can be extended or the system has to be completely replaced.
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Swift, Mark. "Corrosion under Insulation on Industrial Piping - a Holistic Approach to Insulation System Design." In CORROSION 2019. NACE International, 2019. https://doi.org/10.5006/c2019-13042.
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Abstract Corrosion Under Insulation (CUI) on industrial piping is a major issue for the oil and gas industry. The potential influence of thermal and acoustic insulation materials is normally assessed through a series of individual laboratory tests on the insulation materials themselves, but very rarely on the applied system. Moreover, the tested physical values do not necessarily and readily reflect the potential influence that a given insulation material or system has on the risk of CUI. A more sophisticated approach is proposed which takes into account not only the applied insulation system, but also the CUI failure behaviour and water or water vapour ingress and retention processes. This approach allows the individual risk assessment of the applied insulation systems against different scenarios of water ingress to be performed. Other influencing factors for the risk assessment include the configuration of the insulation system (e.g. insulation materials, aluminium barrier foil, outside claddings) and specified construction or installation methods. It is hoped that the approach proposed in this paper will enable the reader to improve their knowledge of insulation materials and their influence on CUI risk and furthermore, be able to better identify vulnerable areas on the facility where CUI is likely to occur, thereby allowing appropriate CUI management strategies to be developed and implemented.
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Reynolds, James, and Peter Bock. "Third Generation Polysiloxane CUI Coatings and Sprayable Insulation for Hot, Cold and Cyclic Service; Lab Testing and More than Five Years of Field Experience." In CONFERENCE 2022. AMPP, 2022. https://doi.org/10.5006/c2022-18044.
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Abstract Third Generation Polysiloxane (TGPS) ambient curing CUI mitigation coatings have been used in the petrochemical industry for over five years. These coating technologies have demonstrated positive results in lab testing as well as both shop and field application for asset management in elevated temperature, cryogenic and cyclic applications across a wide range of service temperatures. TGPS coatings have also demonstrated effective use of a two-step (primer-insulation) CUI mitigation system when compared to traditional (CUI coating-fibrous or granular insulation-cladding) systems.
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Miyashita, Junki. "Performance of Three Types of Coatings in a Simulated Corrosion under Insulation Condition." In CORROSION 2017. NACE International, 2017. https://doi.org/10.5006/c2017-09296.
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Abstract Corrosion Under Insulation (CUI) is a serious threat that is unavoidable during long term plant operation, and coatings are the most effective measure for preventing CUI. Three types of coatings (i.e., heat resistant epoxy coating, new technology liquid coating (Note), and thermal sprayed aluminum coating) are typical candidates for preventing CUI. However, neither a set of guidelines for selection of the best coating system nor a standardized test method for CUI has been established. In order to establish such a set of guidelines and standardized test method, much more information is needed. This paper evaluates the resistances to CUI of three types of coatings under severe CUI conditions using a vertical pipe test method1. Certain possible improvements in the test method are also discussed. Note: “Inorganic copolymer or coatings with an inert multipolymeric matrix” specified as coating systems CS-6 and SS-5 in NACE(1) SP01982
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Wilds, Neil. "Performance of Next Generation CUI Mitigation Systems." In CORROSION 2017. NACE International, 2017. https://doi.org/10.5006/c2017-09331.
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Abstract Corrosion under Insulation (CUI) is one of the costliest problems facing the Oil & Gas and Process industries today. According to corrosion engineers, problems such as major equipment outages and unexpected maintenance costs stemming from CUI account for more unplanned downtime than all other causes. Thermal insulation of piping, valves, tanks or vessels is achieved by an INTEGRAL SYSTEM comprising of corrosion mitigation coating, thermal insulation media, and external cladding. If there is a failure of any of the three components this will result in the failure of the entire system or loss of long-term purpose of the system. Corrosion under insulation (CUI) generally originates as a result of ingress of water from various sources such as rainfall, cooling tower drift, steam discharge, wash downs and, because insulation is not vapour tight, condensation. In the past manufacturers of the three separate components frequently compete between themselves who has the best component, forgetting that the failure of the two remaining components may negate superiority of their particular component. There are numerous corrosion mitigation coatings, a wide variety of different types of thermal insulation media, or types of external cladding. It is often the best combination of the three which results in the BEST THERMAL INSULATION SYSTEM that has the best chance in minimizing the CUI and fulfilling the long-term thermal insulation function. Apart from the costs incurred by equipment or process outages there are also other costs that are sometimes not considered and this is time taken to apply and handle the CUI coating system and the amount of repairs to CUI coatings in the field that occur adding to installed costs of the CUI system and increased project costs. Coatings utilised for the mitigation of CUI have been prominent for decades and are described in detail in NACE Standard SP0198-20101, “The Control of Corrosion Under Thermal Insulation and Fireproofing Materials - A Systems Approach” More recently, from the early 2000's, dedicated CUI coatings have been formulated but have been seen to be either; Too soft, often difficult to handle without damage in new construction or refurbishment scenarios such as piping and valves resulting in delays to installation of the coated specimenToo hard and brittle, often difficult to handle without damage in new construction or refurbishment scenarios such as piping and valves resulting in increased repairs The challenge laid down by the customers to the coating manufacturers is to develop next generation CUI coatings combining both flexibility and also mechanical performance without detracting from the thermal and anti-corrosion performance which will lead to a decrease in in field remedial works. This however this is only one part of the CUI mitigation system and does not get away from the fact that one of the major potential contributors to CUI is the type of insulation itself. This paper will detail the performance differences between 1st generation and the next generation of ‘Multi Polymeric Inorganic Copolymer ‘and the proven benefits observed by the end user in the field but will also look at the alternatives to traditional insulation in the fight against CUI.
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Funahashi, Miki. "Solution to CUI with Three Layered Control and Warning Systems." In CORROSION 2014. NACE International, 2014. https://doi.org/10.5006/c2014-4079.
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Abstract Recently, the number of the accidents caused by Corrosion Under Insulation (CUI) leaks has been increasing in many countries. CUI is the most expensive problem in refineries and petrochemical plants due to the highly corrosive conditions and the lack of visual access. In general, CUI is caused by water under, or within, the insulation in contact with pipe. Visual inspection of steel piping, vessels and equipment by removing the insulation is the most reliable way to find CUI locations at present. However the cost of the inspection is significantly high, so that only limited areas are selected for the visual inspection. In cyclic and low temperature operating pipes and equipment, the main source of water is condensation, so that the entire piping and vessel surfaces are subject to CUI regardless of whether there may be ingress of water from the outside environment. Often, thermal sprayed aluminum (TSA) coatings are used to control CUI at present. Some CUI monitoring methods and non-destructive testing are also used to detect CUI. However, because these methods are limited and lack accuracy, the risks of CUI still exist. Based on the shortcomings of the existing methods, a cost-effective three-layer CUI protection system was developed by combining galvanic, cathodic and barrier protection. This paper discusses how to protect pipes from CUI using this three-layer system including cathodic protection and barrier protections and a new method to detect CUI locations remotely.
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Wilds, Neil. "High Performance Solutions for the Mitigation or Elimination of Corrosion under Insulation (CUI)." In MECC 2023. AMPP, 2023. https://doi.org/10.5006/mecc2023-20243.
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Abstract Corrosion under insulation (CUI), is still a critical threat to Oil & Gas and the process industries and requires coatings solutions which will not only look at the protection of steel under traditional insulation systems such as mineral wool and calcium silicate but also give an alternative to traditional insulation systems which could eliminate the conditions leading to CUI. This paper will firstly review details of performance testing of micaceous iron oxide, MIO, enhanced epoxy and inorganic technologies. Testing is centered around a fabrication to field approach looking at not only CUI simulation tests but ambient curing cyclic corrosion tests required for transportation of bulk items for Global projects. The paper will then move onto the other potential solution of CUI i.e. removing the insulation system and replacing it with a thermal insulation coating (TIC). Sherwin-Williams has developed a new TIC coating which can be applied in one coat instead of the current multiple coat system greatly reducing labour costs. This coating, a next generation waterborne TIC has low thermal conductivity and is designed to provide protection from surface contact burns via a single coat application. The coating insulates high temperature processes and lowers the surface temperature of the process vessels or pipes. Additionally, this product reduces solar radiant heat gain, a significant contribution of unwanted temperature increases in high solar exposure environments, thereby keeping commodities’ temperatures from rising too high. These two new technology platforms gives a unique opportunity to tackle CUI from two directions giving the customer alternative solutions to their CUI mitigation and elimination strategies.
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Zupicich, Christian, and Michael F. MeLampy. "Selection of Coating Systems for CUI Service." In SSPC 2013 Greencoat. SSPC, 2013. https://doi.org/10.5006/s2013-00044.
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Abstract This paper will discuss issues related to corrosion protection of high temperature carbon steel substrates which are insulated to preserve energy, provide process control and to keep workers safe from burn injuries. Corrosion under insulation (CUI) is a serious problem for many owners who have insulated service, where severe corrosion often occurs which can cause plant or process shutdowns, environmental damages and potential injuries to workers. A review of past and current technologies for preventing CUI will be presented. The initial and long term costs, performance characteristics, expected service life as well as ease of application and repair of coatings used under insulation will be discussed. Field and laboratory performance experience obtained from users, third-party laboratories, and vendors of the various coating systems are used for this comparison. It is this long term cost which determines the true value to the user of any CUI coating system. Local and overall risks associated with perforations are also of major concern. The two along with several other factors are important in coating selection process.
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John, D. G., D. Buxton, A. Piercy, et al. "Corrosion Control Issues for Marine Vessel Copper-Nickel Boxcoolers." In CORROSION 2014. NACE International, 2014. https://doi.org/10.5006/c2014-3818.
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Abstract Copper-Nickel (CuNi) alloys (sometimes referred to as Cunifer) have good corrosion resistance and natural fouling resistance in seawater and are used extensively for seawater systems, including heat exchangers. For smaller marine vessels (for example tugs, support vessels, etc.) the heat exchanger tubes are simply placed inside a seachest, open to the sea, to allow cooling creating a box cooler arrangement. To maintain the natural anti-fouling properties the CuNi needs to be isolated from the vessel’s cathodic protection (CP) system. However, depending on the configuration of the cooler and seachest as well as the position of the cathodic protection anodes within the seachest, isolated coolers can be at risk of stray current corrosion problems. As the tube walls are thin, even low rates of corrosion should be avoided. The paper will describe the overall problems encountered and methods developed to prevent stray current corrosion damage, whilst maintaining the natural marine fouling resistance of the CuNi.
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Swift, Mark. "Assessing the Impact of Insulation Choice on Corrosion in a High Humidity, Dual Temperature Environment Cycling between +5 °C and +80 °C (41 °F and 176 °F)." In CORROSION 2018. NACE International, 2018. https://doi.org/10.5006/c2018-10862.
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Abstract The benefits of closed cell, flexible elastomeric foam (FEF) insulation materials have long been appreciated by its users for application in challenging environments, such as marine and offshore. Despite their successful history, it is only recently that efforts have been made to qualify the benefits of FEF systems with respect to mitigating corrosion under insulation (CUI). The work began in 2014 with an assessment of the long-term performance of damaged insulation systems subjected to a continuous salt water spray environment and temperature conditions conducive to the development and spread of CUI. This paper describes the details of a second procedure developed by the testing centre INNCOA to assess the performance of several insulation systems with respect to the ingress of water vapour through a damaged section of the covering layer. The insulation systems were subjected to a continuous cycling within the cold/intermediate temperature regime in order to create favourable conditions for water vapour penetration into the insulation system and consequential CUI development. The results of this evaluation demonstrate that a systems approach to testing better represents real-life conditions for the initiation of CUI caused solely by water vapour ingress. While long term corrosion cannot be prevented, the independent assessment concludes that: ‘Insulation systems operating over a longer period with risk of condensation penetrating the insulation, Flexible Elastomeric Systems are recommended to mitigate corrosion under insulation’.
Reports on the topic "CuII system"
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McManamay, Rachel, and Wendy Wright. Vegetation mapping at Cumberland Island National Seashore. National Park Service, 2017. https://doi.org/10.36967/2243967.
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The Southeast Coast Network (SECN), with the support of the National Park Service (NPS) Vegetation Mapping Inventory Program, described and mapped vegetation at Cumberland Island National Seashore (CUIS). This mapping effort was accomplished through collaboration with the Southeast regional office of NatureServe (Raleigh/Durham, N.C.). The mapping area was 15,163.4 hectares (ha), encompassing the entire boundary of the seashore plus an additional buffered area. NatureServe ecologists identified plant associations for the seashore and a remote sensing specialist from the Southeast Coast Network conducted the vegetation mapping using 1:12,000-scale, color-infrared aerial photography and digital orthophotography. NatureServe collected vegetation and environmental data from 85 vegetation classification plots, and the remote sensing specialist assessed 60 observation points. Interns from the Student Conservation Association (SCA) and consultants from the Atkins consulting firm conducted an accuracy assessment (AA), which entailed sampling 712 points. Fieldwork and mapping were completed between 2005 and 2015. A total of 43 map classes were developed to map the vegetation and general land cover of Cumberland Island National Seashore and surroundings, including the following: 32 map classes representing natural/semi-natural vegetation at the association level in the National Vegetation Classification System (NVCS), 1 map class representing cultural vegetation (e.g., developed) in the NVCS, and 10 map classes representing non-vegetated units (e.g., open water bodies, buildings, roads). Features were interpreted using 1:12,000 scale digital color-infrared aerial photography (flown 01 May 2011) through heads-up-digitizing in ArcGIS (Version 10.0, © 2010 Environmental Systems Research Institute, Redlands, California). Polygons were mapped to a 0.5-hectare minimum mapping unit (MMU). A geodatabase containing various feature class layers and tables was constructed to show the locations of vegetation types and general land cover (vegetation map), vegetation plot samples, AA sites, project boundary extent, and aerial photographic centers. The feature class layer for the CUIS vegetation map provides 1,005 polygons of detailed attribute data covering 15,163.4 hectares, with an average polygon size of 144.7 hectares. Of the area mapped, 816 polygons (81% of all polygons) represent natural/semi-natural vegetation types in the NVCS, encompassing 9,542.8 hectares (62.9%) of the total map extent. Summary reports generated from the vegetation map layer indicate that the combined group Live Oak – (Cabbage Palmetto) Forest Alliance / Southeastern Florida Maritime Hammock dominates the vegetated landscape (101 polygons covering 3,746.6 ha). The combined group Southern Atlantic Coast Salt Marsh / Salt Flat (Swampfire Type) also covers a considerable portion of the seashore (92 polygons totaling 3,678.8 ha). A thematic accuracy assessment study was conducted on the nine map classes in the boundary of the seashore that represent floristic types within the NVCS. Results present an overall accuracy of 83.9% (Kappa statistic = 64.2%) based on data from 712 AA sites.
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McDonald, Jacob, and M. Gregory. Back barrier erosion monitoring at Cumberland Island National Seashore: 2018 data summary—Version 2.0. National Park Service, 2019. https://doi.org/10.36967/2259083.
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In 1999, the National Park Service’s (NPS) Inventory and Monitoring (I&M) Program (now I&M Division) substantially expanded a pilot long-term ecological monitoring program known as “Vital Signs Monitoring” to cover more than 270 parks. The program was designed to provide the minimum infrastructure required to identify and monitor the conditions of the highest priority resources within the National Park System (Fancy et al. 2009). The Southeast Coast Network (SECN) was one of thirty-two networks formed to implement the I&M Division’s program and is tailored to the specific needs of the parks within the network. The overarching purpose of SECN natural resource monitoring is to (1) collect and produce scientifically sound data that describes the current status of—and long-term trends in—the composition, structure, and function of park ecosystems, and (2) to determine how current management practices are sustaining these systems. The Southeast Coast Network achieves the above purposes by implementing long-term monitoring protocols and providing additional technical assistance when necessary. This report provides the results of a technical assistance project implemented at Cumberland Island National Seashore (CUIS) to monitor island margin retreat on the back barrier (west) side of the island. On 19–20 June 2017, the Southeast Coast Network and the United States Geological Survey (USGS) conducted an island margin survey of five sites on the back barrier side of Cumberland Island National Seashore. These five sites, Cumberland Wharf (CW), Brickhill Bluff (BB), Plum Orchard (PO), Dungeness Wharf (DW), and Raccoon Key (RK), had previously been monitored by the USGS from December 2011 to February 2013 to determine the average rate of island margin retreat at these pre-identified erosional hotspots (Calhoun and Riley 2016). The purpose of the 2017 survey was to determine if the long-term rates of island margin retreat from 2013 to 2017 (which includes the effects of Hurricane Matthew) is consistent with the rates observed from 2011 to 2013. On 27–28 March 2018, the five back barrier sites were again resurveyed by the Southeast Coast Network to determine the potential influence Hurricane Irma had on the island. A brief summary of the 2017 and 2018 surveys is provided below. The main report provides some background on each of the study sites, a general overview of the methods used to collect and process the data, and a more in-depth look at the results of the surveys.
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Baron, Lisa, William Vervaeke, and M. Gregory. Monitoring coastal wetland elevation in Southeast Coast Network parks: Protocol implementation plan. National Park Service, 2023. http://dx.doi.org/10.36967/2301244.
Full textAbstract:
The National Park Service (NPS) Inventory and Monitoring Division has initiated coastal wetland elevation monitoring at or in the vicinity of Cape Hatteras National Seashore (CAHA), Cape Lookout National Seashore (CALO), Fort Pulaski National Monument (FOPU), Fort Frederica National Monument (FOFR), Cumberland Island National Seashore (CUIS), Timucuan Ecological and Historic Preserve (TIMU), Fort Matanzas National Monument (FOMA), and Canaveral National Seashore (CANA). This protocol implementation plan is based on the Northeast Coastal and Barrier Network protocol, The Surface Elevation Table and Marker Horizon Technique: A Protocol for Monitoring Wetland Elevation Dynamics (Lynch et al. 2015) with the goal of ensuring NPS data are comparable with existing, contemporary, and future data sets collected by NPS monitoring networks and other monitoring programs. The Southeast Coast Network?s (SECN) coastal wetland monitoring effort collects surface elevation and marker horizon data at permanent monitoring stations in park salt marsh and mangrove wetlands to provide data to park resource managers on the status of, and trends in, coastal wetland conditions and abilities to adapt to sea level rise within the park and surrounding areas. In addition to sites located with park managed areas, multiple sites located within the Guana Tolomato Matanzas National Estuarine Research Reserve (GTMNERR) are being monitored in a partnership with their system-wide wetland elevation monitoring program. The sites monitored through the GTMNERR partnership are near Fort Matanzas National Monument and Castillo de San Marcos National Monument (CASA), geographically located between Canaveral National Seashore and Timucuan Ecological and Historic Preserve. Similarly, other partnerships will be perused around other parks to better understand wetland elevation dynamics around those areas. The purpose of this protocol implementation plan is twofold: to provide a monitoring framework for collecting scientifically sound data and to supply information to help evaluate the current status and trends in coastal wetland conditions. Understanding trends in coastal wetland condition and how stressors such as coastal storms and sea level rise affect them is important for managing these important ecosystems. Surface elevation and marker horizon data can be leveraged to determine if current management practices or environmental conditions are sustaining the desired functions and uses of the parks. Data collected under this protocol implementation plan are stored in the NPS Surface Elevation Table (SET) Monitoring Database (NPS I&M 2017). In addition to utilizing customized data handling and reporting procedures, this plan and its accompanying standard operating procedures (SOPs) set guidelines for data to be made available internally to park resource managers and employees along with publication to larger audiences via peer-reviewed reports and briefing statements.
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Boyle, M., M. Gregory, Michael Byrne, Paula Capece, Sarah Corbett, and Wendy Wright. Terrestrial vegetation monitoring in Southeast Coast Network parks: Protocol implementation plan. National Park Service, 2019. https://doi.org/10.36967/2263392.
Full textAbstract:
The Southeast Coast Network conducts long-term terrestrial vegetation monitoring as part of the nationwide Inventory and Monitoring Program of the National Park Service. Vegetation in parks is monitored as a key vital sign and indicator of overall ecosystem health because changes in vegetation condition reflect effects of stressors such as extreme weather, disease, invasive species, fire, and land use change. Plants also provide the structured habitat and food resources on which other species depend. Monitoring plants and their associated communities over time allows for targeted understanding of ecosystems within the SECN geography, which provides managers information about the degree of change within their parks’ natural vegetation. The Southeast Coast Network adheres to the definition of “natural” vegetation proposed by the National Vegetation Classification System as “vegetation which appears to be unmodified by human activities”, which differs from “cultural” vegetation “which is planted or actively maintained by humans such as annual croplands, orchards, and vineyards (Grossman et al. 1998).” Terrestrial vegetation monitoring takes place within natural vegetation areas of 15 national park units within the Southeast Coast Network. Parks include Canaveral National Seashore (CANA), Cape Hatteras National Seashore (CAHA), Cape Lookout National Seashore (CALO), Chattahoochee River National Recreation Area (CHAT), Congaree National Park (CONG), Cumberland Island National Seashore (CUIS), Fort Frederica National Monument (FOFR), Fort Matanzas National Monument (FOMA), Fort Pulaski National Monument (FOPU), Fort Sumter National Monument (FOSU), Horseshoe Bend National Military Park (HOBE), Kennesaw Mountain National Battlefield Park (KEMO), Moores Creek National Battlefield (MOCR), Ocmulgee Mounds National Historical Park (OCMU), and Timucuan Ecological and Historic Preserve (TIMU). The Southeast Coast Network monitors between nine and seventy-seven randomly located plots within each park. The number of plots depends on several factors, including the total terrestrial area and coverage of broadly defined habitat types within the park or its respective management unit. Monitored habitat types include tidal and nontidal maritime wetlands, alluvial wetlands, nonalluvial wetlands, upland forests, open upland woodlands, and natural to semi natural successional communities. Plots are 20 × 20 meters (65.6 × 65.6 feet [ft]) in size. Data collected in each plot include species richness, species-specific cover and constancy, species-specific woody stem seedling/sapling counts and adult tree (greater than 10 centimeters [3.9 inches (in)]) diameter at breast height (DBH), and site conditions and environmental covariates. The Southeast Coast Network’s approach, rationale, and required resources for terrestrial vegetation monitoring are described in this document, the protocol implementation plan narrative. Ten associated Standard Operating Procedures (SOPs) provide detailed instructions on how to collect, manage, analyze, and disseminate the project’s findings. The network’s narrative and some SOPs are derived, in large part, from Vegetation Monitoring Protocol for the Cumberland Piedmont Network, Version 1 (White et al. 2011). Any differences in approach between the two networks is documented throughout this Southeast Coast Network narrative and the SOP documents.