Academic literature on the topic 'MFA phase'
Create a spot-on reference in APA, MLA, Chicago, Harvard, and other styles
Consult the lists of relevant articles, books, theses, conference reports, and other scholarly sources on the topic 'MFA phase.'
Next to every source in the list of references, there is an 'Add to bibliography' button. Press on it, and we will generate automatically the bibliographic reference to the chosen work in the citation style you need: APA, MLA, Harvard, Chicago, Vancouver, etc.
You can also download the full text of the academic publication as pdf and read online its abstract whenever available in the metadata.
Journal articles on the topic "MFA phase"
1
Москвин, А. С., та Ю. Д. Панов. "Природа псевдощелевой фазы ВТСП купратов". Физика твердого тела 62, № 9 (2020): 1390. http://dx.doi.org/10.21883/ftt.2020.09.49759.06h.
Full textAbstract:
The pseudogap phase of HTSC cuprates is associated with the formation of a system of quantum electron-hole (EH) dimers similar to the Anderson RVB-phase. We considered the specific role of electron-lattice relaxation in the formation of metastable EH dimers in cuprates with T- and T′-structures. In the model of charge triplets and S = 1 pseudospin formalism, the effective spin-pseudospin Hamiltonian of the cuprate CuO2 plane is introduced. In the framework of the molecular field approximation (MFA) for the coordinate representation, the main MFA phases were found: an antiferromagnetic insulator, a charge density wave, a bosonic superconductor with d-symmetry of the order parameter, and two metal Fermi-phases forming the phase of the "strange" metal. We argue that the MFA can correctly reproduce all the features of the typical cuprate phase diagrams. As for typical s = 1/2 quantum antiferromagnet the actually observed cuprate phases such as charge order and superconductivity reflect "physical" ground state, which is close to MFA-phases but with strongly reduced magnitudes of the local order parameters.
2
Kastberger, Gerald, Martin Ebner, and Thomas Hötzl. "Giant honeybees (Apis dorsata) trade off defensiveness against periodic mass flight activity." PLOS ONE 19, no. 4 (2024): e0298467. http://dx.doi.org/10.1371/journal.pone.0298467.
Full textAbstract:
The giant honeybee Apis dorsata (Fabricius, 1793) is an evolutionarily ancient species that builds its nests in the open. The nest consists of a single honeycomb covered with the bee curtain which are several layers of worker bees that remain almost motionless with their heads up and abdomens down on the nest surface, except for the mouth area, the hub between inner- and outer-nest activities. A colony may change this semi-quiescence several times a day, depending on its reproductive state and ambient temperature, to enter the state of mass flight activity (MFA), in which nest organisation is restructured and defense ability is likely to be suppressed (predicted by the mass-flight-suspend-defensiveness hypothesis). For this study, three episode of MFA (mfa1-3) of a selected experimental nest were analysed in a case study with sequences of >60 000 images at 50 Hz, each comprise a short pre-MFA session, the MFA and the post-MFA phase of further 10 min. To test colony defensiveness under normative conditions, a dummy wasp was cyclically presented with a standardised motion programme (Pd) with intervening sessions without such a presentation (nPd). Motion activity at five selected surveillance zones (sz1-5) on the nest were analysed. In contrast to mfa1,2, in mfa3 the experimental regime started with the cyclic presentation of the dummy wasp only after the MFA had subsided. As a result, the MFA intensity in mfa3 was significantly lower than in mfa1-2, suggesting that a colony is able to perceive external threats during the MFA. Characteristic ripples appear in the motion profiles, which can be interpreted as a start signal for the transition to MFA. Because they are strongest in the mouth zone and shift to higher frequencies on their way to the nest periphery, it can be concluded that MFA starts earlier in the mouth zone than in the peripheral zones, also suggesting that the mouth zone is a control centre for the scheduling of MFA. In Pd phases of pre- and postMFA, the histogram-based motion spectra are biphasic, suggesting two cohorts in the process, one remaining at quiescence and the other involved in shimmering. Under MFA, nPd and Pd spectra were typically Gaussian, suggesting that the nest mates with a uniform workload shifted to higher motion activity. At the end of the MFA, the spectra shift back to the lower motion activities and the Pd spectra form a biphasic again. This happens a few minutes earlier in the peripheral zones than in the mouth zone. Using time profiles of the skewness of the Pd motion spectra, the mass-flight-suspend-defensiveness hypothesis is confirmed, whereby the inhibition of defense ability was found to increase progressively during the MFA. These sawtooth-like time profiles of skewness during MFA show that defense capability is recovered again quite quickly at the end of MFA. Finally, with the help of the Pd motion spectra, clear indications can be obtained that the giant honeybees engage in a decision in the sense of a tradeoff between MFA and collective defensiveness, especially in the regions in the periphery to the mouth zone.
3
Spinanger, Dean. "Textiles Beyond the MFA Phase-Out." World Economy 22, no. 4 (1999): 455–76. http://dx.doi.org/10.1111/1467-9701.00213.
Full text
4
Lequeux, Gaspard, Joeri Beauprez, Jo Maertens, et al. "Dynamic Metabolic Flux Analysis Demonstrated on Cultures Where the Limiting Substrate Is Changed from Carbon to Nitrogen andVice Versa." Journal of Biomedicine and Biotechnology 2010 (2010): 1–19. http://dx.doi.org/10.1155/2010/621645.
Full textAbstract:
The main requirement for metabolic flux analysis (MFA) is that the cells are in a pseudo-steady state, that there is no accumulation or depletion of intracellular metabolites. In the past, the applications of MFA were limited to the analysis of continuous cultures. This contribution introduces the concept of dynamic MFA and extends MFA so that it is applicable to transient cultures. Time series of concentration measurements are transformed into flux values. This transformation involves differentiation, which typically increases the noisiness of the data. Therefore, a noise-reducing step is needed. In this work, polynomial smoothing was used. As a test case, dynamic MFA is applied onEscherichia colicultivations shifting from carbon limitation to nitrogen limitation and vice versa. After switching the limiting substrate from N to C, a lag phase was observed accompanied with an increase in maintenance energy requirement. This lag phase did not occur in the C- to N-limitation case.
5
Manoj, Greeshma. "Export performance of Indian Textile Industry in the Post Multi Fibre Agreement Regime." Artha - Journal of Social Sciences 13, no. 4 (2014): 63. http://dx.doi.org/10.12724/ajss.31.5.
Full textAbstract:
The Multi Fibre Agreement (MFA) and the quota system which governed the international trade in textiles and clothing came to an end on 1st January, 2005. The quota systems were more restrictive against cotton based fibres, which dominate India’s textile exports. Since India has a natural comparative advantage in cotton and cotton based fibres, abolition of MFA was expected to benefit India’s cotton industry as well as cotton based textiles and clothing sectors. This paper analyses the export performance of Indian textile industry in the post quota regime in terms of different sub sectors of Indian textiles during the period from 1992 to 2012.The entire period of the study is divided into Pre MFA (1992-2004) and Post MFA (2005-2012). Export performance has been examined in terms of annual growth rate and Compound Annual Growth Rate for the period from 1992-2012. The study finds that the textile exports have registered a strong growth rate in the post quota period (2005-2006), increasing from 2.69% in 2004-2005 to 23.14% in 2005-2006. A comparison of the different sectors of the textile export shows that all the sectors recorded an increase in the export values at different phases of the quota removal. If we compare the pre MFA growth (III Phase) and Post MFA growth (IV Phase), there has been a remarkable improvement in the export performance of all the sub sectors. Biggest gainer in the post MFA period is manmade textiles followed by cotton textiles and readymade garments. But India was not able to continue the same momentum in the succeeding years. This clearly indicates that Indian textile industry is facing so many challenges in the post quota regime. Thus, it is imperative to improve the competitiveness of our exports through policy changes, new investment and efficient supply chain management. Keywords: Textiles and clothing, Quota removal, MFA, Export performance, Trend analysis.
6
Purwantoro, Dwi Utami, Ilma Nugrahani, and Slamet Ibrahim Surantaatmadja. "Studies of preparation, characterization, and solubility of mefenamic acid-nicotinamide co-crystal synthesized by using melt crystallization method." Asian Journal of Pharmaceutical and Clinical Research 10, no. 5 (2017): 135. http://dx.doi.org/10.22159/ajpcr.2017.v10i5.15863.
Full textAbstract:
Objective : The objective of this study is to develop the formation mefenamic acid (MFA) – nicotinamide (NCT) co-crystal by using melt crystallization method and investigate its solubility.Method : Co-crystal was prepared by using melt crystallization method of MFA-NCT (1:2) at (220±3) ° C. The initial co-crystal formation was performed by powder x-ray diffraction (PXRD). The thin layer chromatography (TLC) method was done to confirm the chemical stability of MFA and NCT due to synthesized process. The melt crystallization of MFA-NCT (1:2) was characterized by DSC/TG, Infrared spectrophotometry, and scanning electron microscopy. The solubility of the melt crystallization of MFA-NCT (1:2) was evaluated by incubated the samples in water at 25 °C and shaken for 24 h. The solubility of MFA was measured by UV-Vis spectrophotometer.Result : Characterizations of a co-crystal MFA-NCT (1:2) including PXRD, FTIR, DSC and SEM have indicated the formation of new solid crystal phase that differ from MFA, NCT and its physical mixture. The chromatogram of the TLC study exhibited two spot that corresponds to MFA and NCT. The solubility of the melt crystallization of MFA-NCT (1:2) was 57.97 % higher than MFA solubility.Conclusion : These results suggest that MFA-NCT co-crystal can be synthesized by using melt crystallization method without decomposition of its component and provides an opportunity for the development of MFA solid form.Keywords: co-crystal, mefenamic acid, nicotinamide, melt crystallization, solubility
7
Lipowski, Adam, António L. Ferreira, and Dorota Lipowska. "Heat-Bath and Metropolis Dynamics in Ising-like Models on Directed Regular Random Graphs." Entropy 25, no. 12 (2023): 1615. http://dx.doi.org/10.3390/e25121615.
Full textAbstract:
Using a single-site mean-field approximation (MFA) and Monte Carlo simulations, we examine Ising-like models on directed regular random graphs. The models are directed-network implementations of the Ising model, Ising model with absorbing states, and majority voter models. When these nonequilibrium models are driven by the heat-bath dynamics, their stationary characteristics, such as magnetization, are correctly reproduced by MFA as confirmed by Monte Carlo simulations. It turns out that MFA reproduces the same result as the generating functional analysis that is expected to provide the exact description of such models. We argue that on directed regular random graphs, the neighbors of a given vertex are typically uncorrelated, and that is why MFA for models with heat-bath dynamics provides their exact description. For models with Metropolis dynamics, certain additional correlations become relevant, and MFA, which neglects these correlations, is less accurate. Models with heat-bath dynamics undergo continuous phase transition, and at the critical point, the power-law time decay of the order parameter exhibits the behavior of the Ising mean-field universality class. Analogous phase transitions for models with Metropolis dynamics are discontinuous.
8
Hanke, Tanja, Katharina Nöh, Stephan Noack, et al. "Combined Fluxomics and Transcriptomics Analysis of Glucose Catabolism via a Partially Cyclic Pentose Phosphate Pathway in Gluconobacter oxydans 621H." Applied and Environmental Microbiology 79, no. 7 (2013): 2336–48. http://dx.doi.org/10.1128/aem.03414-12.
Full textAbstract:
ABSTRACTIn this study, the distribution and regulation of periplasmic and cytoplasmic carbon fluxes inGluconobacter oxydans621H with glucose were studied by13C-based metabolic flux analysis (13C-MFA) in combination with transcriptomics and enzyme assays. For13C-MFA, cells were cultivated with specifically13C-labeled glucose, and intracellular metabolites were analyzed for their labeling pattern by liquid chromatography-mass spectrometry (LC-MS). In growth phase I, 90% of the glucose was oxidized periplasmically to gluconate and partially further oxidized to 2-ketogluconate. Of the glucose taken up by the cells, 9% was phosphorylated to glucose 6-phosphate, whereas 91% was oxidized by cytoplasmic glucose dehydrogenase to gluconate. Additional gluconate was taken up into the cells by transport. Of the cytoplasmic gluconate, 70% was oxidized to 5-ketogluconate and 30% was phosphorylated to 6-phosphogluconate. In growth phase II, 87% of gluconate was oxidized to 2-ketogluconate in the periplasm and 13% was taken up by the cells and almost completely converted to 6-phosphogluconate. SinceG. oxydanslacks phosphofructokinase, glucose 6-phosphate can be metabolized only via the oxidative pentose phosphate pathway (PPP) or the Entner-Doudoroff pathway (EDP).13C-MFA showed that 6-phosphogluconate is catabolized primarily via the oxidative PPP in both phases I and II (62% and 93%) and demonstrated a cyclic carbon flux through the oxidative PPP. The transcriptome comparison revealed an increased expression of PPP genes in growth phase II, which was supported by enzyme activity measurements and correlated with the increased PPP flux in phase II. Moreover, genes possibly related to a general stress response displayed increased expression in growth phase II.
9
Liu, Peng, Xinglan Cui, Yajing Wang, et al. "Preparation and Characterization of Lauric Acid/Modified Fly Ash/Graphene Composite as Low-Cost and Eco-Friendly Phase Change Materials for Thermal Energy Storage." Energies 16, no. 15 (2023): 5666. http://dx.doi.org/10.3390/en16155666.
Full textAbstract:
Fly ash is a kind of industrial solid waste that is considered “hazardous waste”. In this study, a supporting matrix of modified fly ash (MFA) was employed to package lauric acid (LA) via a facile direct impregnation method involving less experimental error. A low-cost and eco-friendly form-stable phase change material (PCM) of LA/MFA/graphene (G) was fabricated, with G as the thermal conductivity enhancer. The preparation and leakage testing of an LA/MFA/G form-stable PCM (FSPCM) were investigated in detail. The leakage test results indicated that good package efficiency was obtained using MFA with a higher specific surface area and richer pore structure to pack the LA. Then, LA/MFA/G composites were characterized via scanning electronic microscope (SEM), Fourier transform infrared spectroscope (FTIR), differential scanning calorimeter (DSC), and thermal gravimetric analyzer (TGA). The results showed that excellent form stability was obtained by adding MFA as the supporting matrix. The SEM analysis indicated that LA could be well dispersed into the structure of MFA. The FTIR analysis demonstrated that the components of the FSPCM were quite compatible. The results of the DSC illustrated that LA/MFA/G (5 wt. %) had a melting point of 45.38 °C and a latent heat of 41.08 J/g. The TGA analysis revealed that the prepared FSPCM had better thermal stability compared with LA within its working temperature range. In addition, the effects of G on the heat transfer performance of the prepared FSPCM were examined. In short, using MFA with a higher specific surface area and richer pore structure to pack the LA via a simple preparation process with less experimental error can contribute to good performance. The research not only improved the comprehensive utilization of solid waste, but also promotes the application of FSPCM in the field of building energy conservation.
10
Kajihata, Shuichi, Chikara Furusawa, Fumio Matsuda, and Hiroshi Shimizu. "OpenMebius: An Open Source Software for Isotopically Nonstationary13C-Based Metabolic Flux Analysis." BioMed Research International 2014 (2014): 1–10. http://dx.doi.org/10.1155/2014/627014.
Full textAbstract:
Thein vivomeasurement of metabolic flux by13C-based metabolic flux analysis (13C-MFA) provides valuable information regarding cell physiology. Bioinformatics tools have been developed to estimate metabolic flux distributions from the results of tracer isotopic labeling experiments using a13C-labeled carbon source. Metabolic flux is determined by nonlinear fitting of a metabolic model to the isotopic labeling enrichment of intracellular metabolites measured by mass spectrometry. Whereas13C-MFA is conventionally performed under isotopically constant conditions, isotopically nonstationary13C metabolic flux analysis (INST-13C-MFA) has recently been developed for flux analysis of cells with photosynthetic activity and cells at a quasi-steady metabolic state (e.g., primary cells or microorganisms under stationary phase). Here, the development of a novel open source software for INST-13C-MFA on the Windows platform is reported. OpenMebius (Open source software for Metabolic flux analysis) provides the function of autogenerating metabolic models for simulating isotopic labeling enrichment from a user-defined configuration worksheet. Analysis using simulated data demonstrated the applicability of OpenMebius for INST-13C-MFA. Confidence intervals determined by INST-13C-MFA were less than those determined by conventional methods, indicating the potential of INST-13C-MFA for precise metabolic flux analysis. OpenMebius is the open source software for the general application of INST-13C-MFA.
Dissertations / Theses on the topic "MFA phase"
1
Binder, Tomas, Christian Chmelik, Jörg Kärger, and Wolfgang Schmidt. "Microscopic analysis of phase transition effects during benzene sorption in MFI type zeolites." Universitätsbibliothek Leipzig, 2015. http://nbn-resolving.de/urn:nbn:de:bsz:15-qucosa-185519.
Full text
2
Binder, Tomas, Christian Chmelik, Jörg Kärger, and Wolfgang Schmidt. "Microscopic analysis of phase transition effects during benzene sorption in MFI type zeolites." Diffusion fundamentals 16 (2011) 64, S. 1-2, 2011. https://ul.qucosa.de/id/qucosa%3A13807.
Full text
3
Hanzig, Juliane. "SrTiO3 unter Einfluss von Temperatur und elektrischem Feld." Doctoral thesis, Technische Universitaet Bergakademie Freiberg Universitaetsbibliothek "Georgius Agricola", 2018. http://nbn-resolving.de/urn:nbn:de:bsz:105-qucosa-226537.
Full textAbstract:
Die Realstruktur des perowskitischen Modellsystems SrTiO3, welches in der Raumgruppe Pm-3m kristallisiert, wird durch die Sauerstoffvakanz als wichtigstem Defekt dominiert. Durch Temperaturbehandlung unter reduzierenden Bedingungen können Sauerstoffvakanzen in die Kristallstruktur eingebracht werden. Aufgrund ihrer positiven Ladung relativ zum Kristallgitter bewegen sie sich im elektrischen Feld entlang des TiO6-Oktaedernetzwerkes. Die Elektroformierung folgt dabei einem Arrheniuszusammenhang, wobei sowohl die Aktivierungsenergie als auch die Mobilität eine deutliche Abhängigkeit von der Kristallorientierung zeigen. Die Umverteilung der Sauerstoffvakanzen führt zu lokalen reversiblen Strukturänderungen, welche die Ausbildung einer neuen migrationsinduzierten feldstabilisierten polaren (MFP) Phase verursachen. In Abhängigkeit von der elektrischen Feldstärke zeichnet sie sich strukturell durch eine tetragonale Verzerrung der ursprünglich kubischen Elementarzelle aus und geht mit dem Verlust der Inversionssymmetrie einher. Die Polarisation in der Struktur wird durch die erwiesene Pyroelektrizität bestätigt und gilt als Grundlage, um anhand eines kristallographischen Symmetrieabstieges die Herleitung der Raumgruppe P4mm zu ermöglichen. Der durch die Migration hervorgerufene intrinsische Defektkonzentrationsgradient ruft eine elektromotorische Kraft hervor, deren Verwendung in einem elektrochemischen Energiespeicher experimentell nachgewiesen wurde. Diese neuen Funktionalitäten sind durch die Anwendung defektchemischer und kristallphysikalischer Konzepte infolge gezielter Materialmodifizierung unter Einfluss von Temperatur und elektrischem Feld zu verstehen<br>The real structure of the perovskite-type model system SrTiO3, crystallizing in space group Pm-3m, is dominated by oxygen vacancies as most important defects. They are introduced in the crystal structure through heat-treatment under reducing conditions. Because of their positive charge relative to the crystal lattice, oxygen vacancies move in an electric field along the TiO6 octahedron network. This electroformation process follows an Arrhenius behavior. Both the activation energy and the mobility show an obvious dependence on the crystal orientation. Redistribution of oxygen defects causes local reversible structural changes, which involve the formation of a migration-induced field-stabilized polar (MFP) phase. In dependence on the electric field strength, this is structurally marked by a tetragonal distortion of the original cubic unit cell and accompanied by a loss of inversion symmetry. The polarisation in the crystal structure is confirmed by the proven pyroelectricity and serves for the argumentation to derive the space group P4mm by means of a crystallographic symmetry descent. The migration-induced intrinsic concentration gradient of oxygen vacancies leads to an electromotive force, whose application as electrochemical energy storage was proven experimentally. These new functionalities are explainable using defect chemistry and crystal physics in consequence of specific material modifications under the influence of temperature and external electric fields
4
Bouvier, Fabienne. "Isothermes a sous-marches : cas de l'adsorption du trichloroéthène et du tetrachloroéthène sur une zéolithe de topologie MFI à 25°C." Dijon, 1998. http://www.theses.fr/1998DIJOS023.
Full textAbstract:
Cette étude trouve un intérêt fondamental dans la compréhension des isothermes à sous-marches qui sont susceptibles d'être observées au cours de l'adsorption, par des zéolithes de topologie MFI, de certains composés qui présentent des caractéristiques géométriques comparables à celles de l'ouverture des canaux de l'adsorbant. Ainsi, l'interaction du trichloroéthène et du tétrachloroéthène, avec trois zéolithes ZSM-5 de rapport Si/Al egal a 26,5, 339 et 500 et une silicalite-1 a été analysée, après une caractérisation préalable, par thermogravimétrie, microcalorimétrie et diffraction des rayons X. L'adsorption du trichloroéthène et du tétrachloroéthène induit un changement de structure monoclinique-orthorhombique des zéolithes riches en silice (Si/Al 339) bien avant le remplissage de 4 molec. /maille à 25°C. Les isothermes d'adsorption du trichloroéthène présentent toujours à 25°C une allure de type I. En revanche, les isothermes d'adsorption du tétrachloroéthène présentent à basse pression une sous-marche dès que le remplissage excède 4 molec. /maille. Cette sous-marche est d'autant plus verticale, plus haute et plus déplacée vers les plus petites valeurs de la pression relative que le rapport Si/Al de l'adsorbant est élevé. De plus, une boucle d'hystérésis est associée a la sous-marche pour les échantillons de rapport Si/Al 339. La sous-marche dans l'isotherme d'adsorption, associée à un pic exothermique dans la courbe de chaleur, a été interprétée comme la signature d'une transition de phase de l'adsorbat. L'existence d'interactions adsorbat-adsorbat fortes est à l'origine de la boucle d’hystérésis (20 kJ. Mol#-#1). Un modèle de remplissage des canaux de la zéolithe est proposé pour chaque espèce adsorbée. Les molécules de trichloroéthène sondent la totalité de la microporosité disponible en formant des chaines de dipôles. Dans le cas du tétrachloroéthène, les quatre premières molécules s'adsorbent aux intersections des canaux droits et des canaux sinusoïdaux puis accèdent, par saut diffusionnel, aux canaux sinusoïdaux. Quatre molécules supplémentaires sont alors adsorbées aux intersections donnant naissance à des chaines sinusoïdales. Cet agencement particulier des molécules par maille de zéolithe donne alors une image de la densification de la phase adsorbée.
5
Daniel, Philippe. "Etude structurale et vibrationnelle des fluorures MF3 (M=Al, Cr, Ga, Fe, V, In. . . )." Le Mans, 1990. http://www.theses.fr/1990LEMA1012.
Full textAbstract:
Les composés MF3 de structure cubique ReO3, sont le siège d'une transition de phase structurale du 1er ordre par rotation des octaèdres autour de l'axe ternaire, qui conduit à une symétrie rhomboédrique (R3C). La croissance cristalline de ces composés est étudiée et les structures cristallines de AlF3, VF3 et ScF3 sont déterminées. L'étude des fluorures MF3 par diffusion Raman est effectuée et l'attribution des raies est faite par comparaison avec la symétrie des modes en phase cubique. L'étude Raman en température montre l'existence de deux modes mous. La transition peut alors être attribuée à la condensation d'un mode situé au point r de la zone de Brillouin cubique. Les données Raman sont suffisantes pour estimer les constantes de forces et calculer le spectre de phonons en phase cubique. L'évolution des constantes de forces en fonction de la distance interionique suit une loi de type Born Mayer et la densité d'état calculée apparaît dépendante de la fréquence du mode mou R5 de la phase cubique. L'étude dynamique de ces composés, directement dans la phase rhomboédrique a mis en évidence par le calcul la levée de dégénérescence du mode R5 comme observe expérimentalement. Un ajustement des constantes de forces peut être effectué et la transition est décrite dans le cadre de la théorie de Landau.
6
Mouville, Clémence. "Interaction entre les pili de type IV et le phage filamenteux MDA : impact potentiel sur la virulence de Neisseria meningitidis." Electronic Thesis or Diss., Université Paris Cité, 2024. http://www.theses.fr/2024UNIP5235.
Full textAbstract:
Neisseria meningitidis (Nm) est une bactérie commensale du nasopharynx humain qui traverse quelques fois la barrière nasopharyngée et se propage dans la circulation sanguine jusqu'à atteindre les méninges. Un bactériophage filamenteux appelé MDA (Meningococcal Disease Associated) est associé aux infections invasives à méningocoques chez les jeunes adultes. Le MDA semble augmenter l'incidence de la maladie en augmentant la colonisation bactérienne au point d'entrée. L'objectif de ce travail a été de comprendre le mécanisme moléculaire précis de l'infection de Nm par le MDA. L'étude des mutants des gènes impliqués dans la machinerie des pili de type IV (PT4) a montré que l'entrée du phage nécessite un PT4 rétractable. Ce résultat est cohérent avec la littérature sur les phages Ff ou CTX qui interagissent directement avec l'extrémité du pilus. Mais aucune preuve de l'interaction du MDA avec l'extrémité du pilus n'a été trouvée. L'interaction possible entre la fibre du pilus et la capside du phage a été examinée. Comme PilE, la piline majeure, est sujette à variation antigénique, des variants de PilE qui diminuent l'entrée du phage ont été identifiés. L'infection par le phage se produit dans des populations de bactéries exprimant des séquences de PilE spécifiques. Par imagerie, nous avons montré que les pili et les MDA s'associaient ensemble. Une analyse de la charge des acides aminés de PilE et celle de la capside soutient l'hypothèse d'une interaction variable selon le variant de PilE. Finalement, il a été montré que les P4T avec un potentiel électrostatique positif favorisaient l'infection par le phage et permettaient, de plus, une forte adhésion des Nm aux cellules humaines. L'inverse est observé pour les P4T chargés négativement. Ce travail présente également les premières caractérisations de la machinerie de sécrétion du phage. Des études préliminaires avaient montré que dans un biofilm formé sur cellules épithéliales, Nm produisaient soit des pili, soit des phages, mais pas les deux en même temps. Nous avons montré que la sécrétion du phage nécessitait PilQ, PilW et TsaP de la machinerie des P4T. Les analyses bio-informatiques suggèrent que l'ORF8 du phage, qui aurait une activité ATPase, s'associerait avec l'ORF11 pour former un complexe qui interagirait avec la sécrétine bactérienne PilQ. Ce modèle est soutenu par des tests d'interaction par double-hybride. Cette interaction mobiliserait les PilQ de la bactérie, les rendant inaccessible à la machinerie de piliation. La surexpression d'ORF8 entraine une inhibition de la piliation. Ces données permettent d'établir un nouveau modèle d'interaction entre les phages filamenteux et les P4T, ce qui pourrait participer à la sélection des souches pathogènes de Nm<br>Neisseria meningitidis (Nm) is a commensal bacterium of the human nasopharynx that sometimes crosses the nasopharyngeal barrier and spreads through the bloodstream to reach the meninges. A filamentous bacteriophage called MDA (Meningococcal Disease Associated) is associated with invasive meningococcal disease in young adults. MDA appears to increase the incidence of the disease by increasing bacterial colonization at the point of entry. The aim of this work was to understand the precise molecular mechanism of infection of Nm by MDA. The study of mutants of genes involved in the type IV pili (T4P) machinery showed that phage entry requires a retractable T4P. This result is consistent with the literature on Ff or CTX phages, which interact directly with the pilus tip. However, no evidence was found for MDA interacting with the T4P tip. The possible interaction between the pilus fiber and the phage capsid was investigated. Since PilE, the major pilin, is subject to antigenic variation, variants of PilE that reduce phage entry were identified. Phage infection occurs in populations of bacteria that express specific PilE sequences. Using imaging, we showed that pili and MDA associate with each other. An analysis of the amino acid charge of the pilin and that of the capsid supports the hypothesis of a variable interaction depending on the PilE variant. Finally, it was shown that T4P with a positive electrostatic potential favored phage infection and allowed the bacteria to adhere strongly to human cells. The opposite is observed for negatively charged T4P. This work also presents the first characterizations of the phage secretion machinery. Previous studies had shown that in a biofilm formed on epithelial cells, Nm produce either pili or phages, but not both at the same time. We showed that phage secretion requires PilQ, PilW and TsaP of the pili machinery. Bioinformatic analyses suggest that phage ORF8, which has ATPase activity, associates with ORF11 to form a complex that interacts with the bacterial secretin PilQ. This model is supported by two-hybrid interaction assays. This interaction would mobilize the bacterial PilQ, making them inaccessible to the piliation machinery. Overexpression of ORF8 inhibits piliation. These data provide a new model for the interaction between filamentous phages and T4P, which could be involved in the selection of pathogenic strains of Nm
7
Bilger, Serge. "Etude de la décomposition thermique de divers cations polypropylammonium occlus dans des zéolithes de type structural MFI." Mulhouse, 1989. http://www.theses.fr/1989MULH0124.
Full textAbstract:
Etude du processus de thermolyse de cations (Pr4N+) occlus dans des zéolites par analyse thermique différentielle, calorimétrie différentielle à balayage, spectrométrie de masse, RMN et chromatographie en phase gazeuse
8
Yang, Guoju [Verfasser], Johannes A. [Akademischer Betreuer] [Gutachter] Lercher, and Klaus [Gutachter] Köhler. "Bifunctional Pt/MFI Catalysts for Hydrogenation of Phenol in Aqueous Phase / Guoju Yang ; Gutachter: Johannes A. Lercher, Klaus Köhler ; Betreuer: Johannes A. Lercher." München : Universitätsbibliothek der TU München, 2017. http://d-nb.info/1135724946/34.
Full text
9
Wang, Jiong. "Analytical studies on the force-induced phase transitions in slender shape memory alloy cylinders layers /." access full-text access abstract and table of contents, 2009. http://libweb.cityu.edu.hk/cgi-bin/ezdb/thesis.pl?phd-ma-b23750546f.pdf.
Full textAbstract:
Thesis (Ph.D.)--City University of Hong Kong, 2009.<br>"Submitted to Department of Mathematics in partial fulfillment of the requirements for the degree of Doctor of Philosophy." Includes bibliographical references (leaves [214]-224)
10
Chéron, Jonathan. "Study of the bacterial microenvironment in a bioleaching stirred tank bioreactor : transport phenomena and kinetic modelling in three-phase flow." Electronic Thesis or Diss., Université de Lorraine, 2021. http://docnum.univ-lorraine.fr/public/DDOC_T_2021_0237_CHERON.pdf.
Full textAbstract:
La biolixiviation extractive est un ensemble de technologies visant à récupérer les métaux contenus dans les ressources minérales via l'assistance de microorganismes. Ces technologies ont été mises en œuvre avec succès à l'échelle industrielle et utilisées, soit sous la forme de traitements en tas, soit en utilisant des réacteurs à cuve agitée à grande échelle. Récemment, la biolixiviation a évolué vers l'exploitation de ressources non communes (très faibles teneurs, minéralogie complexe ou forte teneur en soufre) causée par la tendance à la baisse des teneurs moyennes en métaux contenus dans les minerais. La biolixiviation en cuve agitée s'est avérée plus efficace que les traitements en décharge ou en tas pour le traitement des ressources de grande valeur (comme les minerais d'or réfractaire), principalement grâce à un meilleur contrôle du processus. Cependant, ce traitement doit encore être optimisé sur le plan technique pour atteindre une viabilité économique dans le cas des ressources non conventionnelles. Dans ce travail de thèse, un modèle couplé hydrocinétique de biolixiviation en réacteur a été développé pour modéliser et simuler le microenvironnement bactérien et sa réponse aux hétérogénéités locales du réacteur afin d'établir des critères d'optimisation. Pour cela, une étude expérimentale a été réalisée à l'échelle laboratoire afin d'obtenir les données nécessaires à la calibration des différents modèles. Cette étude comprenait des tests de biolixiviation en cuve agitée pour recueillir les paramètres cinétiques, et des études abiotiques pour déterminer les paramètres hydrodynamiques essentiels (Njs, kla). Dans une seconde étude, un modèle CFD multi-échelle solide-liquide a été développé et simulé en utilisant différentes conditions de géométries de mobiles d'agitation, de concentrations en solide et de vitesses d'agitation. L'impact de ces conditions sur l'homogénéité du solide et la contrainte mécanique perçue par les particules a été évalué et des règles de base de dimensionnement ont été extrapolées à partir des résultats. Enfin, un modèle hydrocinétique d'un réacteur de biolixiviation multi-échelle a été développé. Pour cela, un modèle CFD décrivant l'écoulement gaz-liquide a été formulé et simplifié en utilisant une approche par compartiments. Cette approche a été modélisée sur MatLab et combinée avec les résultats précédents sur les modèles cinétiques et d'hydrodynamique solide-liquide. Enfin, le modèle hydrocinétique compartimenté a été utilisé pour caractériser la cinétique de biolixiviation puis comparé aux données expérimentales<br>Extractive bioleaching is a range of technologies aiming at recovering metals contained in mineral resources using biological means. It was successfully implemented at the industrial scale and used either in the form of dump or heap treatments, or by using large-scale stirred tank reactors (STR). Recently, bioleaching is evolving towards the exploitation of unusual resources (very low-grades, complex mineralogy, or high sulphur content) caused by the declining trend in mean ore grades. Bioleaching STR have proven to be more efficient than the dump or heap treatments for the treatment of high-value resources (such as refractory gold ores) mainly thanks to the better control over the process. However, it still needs further technical optimization to reach economic viability in the case of unconventional resources. In this PhD work, a coupled bioleaching STR hydrokinetic model was developed to model and simulate the bacterial microenvironment / response to the local heterogeneities of the tank in order to establish optimization criteria. First, an experimental study was performed at laboratory-scale to obtain the data necessary for the calibration of the various models. This includes bioleaching tests in STR to gather kinetics parameters and abiotic studies to determine essential hydrodynamics parameters (Njs, kla). On a second study, a multi-scale solid-liquid CFD model was developed and simulated using various conditions of impeller geometries, solid concentrations, and agitation rates. The impact of these conditions on solid homogeneity and particle stress was assessed and basic sizing rules were extrapolated from the results. Lastly, a hydro-kinetic model of a multi-scale bioleaching STR was developed. For this, a CFD model describing the gas-liquid flow was developed and simplified using a compartment approach. This approach was modelled on MatLab and combined with previous results on kinetic and solid-liquid models. Finally, the compartment hydro-kinetic model was used to characterize the kinetics of bioleaching and was compared with experimental data
Books on the topic "MFA phase"
2
Das, R. Upendra. Industrial restructuring and export competitiveness of the textiles and clothing sector in SAARC in the context of MFA phase-out. Research and Information System for the Non-aligned and Other Developing Countries, 2004.
Find full text
3
Bilanin, Jeanne E. A staffing levels study for the Maryland Aviation Administration (MAA), phase II. Institute for Governmental Service, University of Maryland System, 1991.
Find full text
4
Gardner, Brian M. A staffing levels study for the Maryland Aviation Administration (MAA), phase III. Institute for Governmental Service, University of Maryland System, 1991.
Find full text
6
IMMELL, TAMARA. CREATING BUSINESS SOLUTIONS & OPPORTUNITIES...PHASE I-INIATING...PHASE II-CREATION...FRANKLIN UNIVERSITY MBA 715. McGraw Hill Custom Publishing, 2005.
Find full text
7
Ray, Sumantra (Shumone), Sue Fitzpatrick, Rajna Golubic, Susan Fisher, and Sarah Gibbings, eds. Clinical trial supplies: investigational medicinal products (IMPs). Oxford University Press, 2016. http://dx.doi.org/10.1093/med/9780199608478.003.0017.
Full textAbstract:
This chapter describes the procedures and records associated with accountability of investigational and non-investigational medicinal products (IMP and NIMP) used in clinical trials, to show that the drug has been labelled according to the regulations, stored in conditions to keep it stable, prepared and administered to the correct subjects in accordance with the protocol, has been fully accounted for and destroyed if unused. Manufacture of IMP is discussed together with methods of blinding. The role of the Qualified person (QP) is reviewed. The need for study drug accountability is discussed in context with the regulatory requirements (Clinical Trial Directive 2001/20/EC and in particular, GMP Directive 2003/94/EC Annex 13). The chapter explains what needs to be accounted for and describes the types of records including: labelling records, delivery and transportation, receipt, storage, preparation, dispensing and administration, unblinding records, reconciliation, returns and destruction. Discussions are included on protocol compliance, management of excursions resulting from incorrect storage conditions, management of dosing errors and documentation errors, expiry date re-labelling, drug recall and re-supply. Sections are included on considerations for non-commercial studies, GMP requirements for UK Phase I clinics and sites requiring a MIA (IMP) license.
Book chapters on the topic "MFA phase"
1
Souza, Adriel Magalhães, Justin Rietberg, Eraldo Jannone da Silva, and Hitomi Yamaguchi. "Hybrid Polishing Tool for Internal Finishing of Complex Part Interiors in Magnetic Abrasive Finishing." In Lecture Notes in Mechanical Engineering. Springer Nature Switzerland, 2025. https://doi.org/10.1007/978-3-031-77429-4_78.
Full textAbstract:
AbstractThis paper describes the development of a new hybrid polishing tool, which consists of magnetic particles and a water-soluble binder and transforms from a bonded-tool phase to a particle-brush phase during polishing. During the bonded-tool phase, the binder remains intact, and material is removed from the peaks of the target surface where abrasive is pressed against the surface. Once the binder dissolves in the lubricant, the magnetic particles separate, form a brush tool (particle-brush phase), and polish the surface while conforming to the surface geometry. The phase transition timing is determined by the lubricant type. The magnetic particles can be collected using magnetic force and reused; the hybrid tool thus contributes to resource utilization and waste reduction. The effects of tool geometry, tool binder content, and lubricant type on the tool-phase transformation and polishing characteristics are clarified by applying the new hybrid tool to internal finishing of stainless steel tubes, made using directed energy deposition, using magnetic abrasive finishing (MAF). MAF mechanically removes material by the action of abrasives pressed against a workpiece with magnetic tools suspended in a magnetic field. Compared with conventional MAF, the hybrid tool achieves a target surface finish with significantly less material removal, minimizing waste production.
2
Payne, Doris L. "Chapter 13. Robust argument phrases (DPs) but unruly NPs in Maa." In The ‘Noun Phrase’ across Languages. John Benjamins Publishing Company, 2020. http://dx.doi.org/10.1075/tsl.128.13pay.
Full text
3
Zaini, Mohd Aufa Hadi Putera, Mohd Mawardi Saari, Nurul A’in Nadzri, and Zulkifly Aziz. "A Digital Dual-Phase Lock-In Amplifier for MFL and ECT NDT Applications." In Lecture Notes in Electrical Engineering. Springer Singapore, 2022. http://dx.doi.org/10.1007/978-981-16-8690-0_86.
Full text
4
Li, Chong, Jintao Gao, and Zhancheng Guo. "Research on Enrichment of MFe and RO Phase from Converter Steel Slag by Super Gravity." In 7th International Symposium on High-Temperature Metallurgical Processing. Springer International Publishing, 2016. http://dx.doi.org/10.1007/978-3-319-48093-0_11.
Full text
5
Li, Chong, Jintao Gao, and Zhancheng Guo. "Research on Enrichment of MFe and RO Phase from Converter Steel Slag by Super Gravity." In 7th International Symposium on High-Temperature Metallurgical Processing. John Wiley & Sons, Inc., 2016. http://dx.doi.org/10.1002/9781119274643.ch11.
Full text
6
Zhang, Xin, Jinsong He, Hao Ma, Zhixun Ma, and Xiaohai Ge. "Stability Constraining Dichotomy Solution Based Model Predictive Control for the Three Phase Inverter Cascaded with Input EMI Filter in the MEA." In Stability Enhancement Methods of Inverters Based on Lyapunov Function, Predictive Control, and Reinforcement Learning. Springer Nature Singapore, 2022. http://dx.doi.org/10.1007/978-981-19-7191-4_6.
Full text
7
Swendsen, Robert H. "Phase Transitions and the Ising Model." In An Introduction to Statistical Mechanics and Thermodynamics. Oxford University Press, 2019. http://dx.doi.org/10.1093/oso/9780198853237.003.0031.
Full textAbstract:
Chapter 17 presented one example of a phase transition, the van der Waals gas. This chapter provides another, the Ising model, a widely studied model of phase transitions. We first give the solution for the Ising chain (one-dimensional model), including the introduction of the transfer matrix method. Higher dimensions are treated in the Mean Field Approximation (MFA), which is also extended to Landau theory. The Ising model is deceptively simple. It can be defined in a few words, but it displays astonishingly rich behavior. It originated as a model of ferromagnetism in which the magnetic moments were localized on lattice sites and had only two allowed values.
8
Khomchu, Wikanda, Suriyaphong Nakem, Jirawadee Pipatanatornkul, et al. "Material Flow Analysis (MFA) and Life Cycle Assessment Study for Sustainable Management of PVC Wastes in Thailand (Phase III)." In Computer Aided Chemical Engineering. Elsevier, 2017. http://dx.doi.org/10.1016/b978-0-444-63965-3.50091-x.
Full text
9
Esquivel, Mariana I. Vergara, Carl D. Brustad Tjernstad, Adam Mac Quarrie, and Mariana I. Tamariz. "Personal Growth and Leadership." In Encyclopedia of Strategic Leadership and Management. IGI Global, 2017. http://dx.doi.org/10.4018/978-1-5225-1049-9.ch036.
Full textAbstract:
In this study, in order to facilitate personal growth in participants, we are using Vygotsky's social development theory. We would like to explore the personal growth in participants by their apparent cognitive transformational experience over a period of four weeks after the implementation of an intervention called Mindfulness into Action (MIA). This study is a continuation of previous research done with the implementation of this methodology (Vergara, 2016a). In this study, the MIA intervention was done at three universities at the same time. In two of them, the MIA methodology was done as a volunteer basis at the University del Norte in Ecuador and the Norwegian University of Science and Technology. On the other hand, at Columbia University, the MIA methodology was implemented as an action research course for masters and doctoral students. In all interventions, participants achieved what is identified as “the third head” (Vergara, Wallace, Du, Marsick, Yorks, & Tamariz, 2016b). Our research question is: How can indigenous knowledge, hourly reflection exercises, and weekly meetings, help facilitate harmony within participants? The research methodology we used to analyze the data from this action research is grounded theory. Through first and second level coding, we found that participants went through the same intra-subjective, inter-subjective, intra-objective, inter-objective dimensions (Vergara, Wallace, Du, Marsick, Yorks, & Tamariz, 2016d) and phases. The initial “reactive” state in phase one had unknown characteristics to participants who were just reacting to everyday life experiences. In phase two, participants became aware of their behaviors, but could not stop non-beneficial behaviors. In phase three, they could observe their unknown behaviors and then change their sabotaging behaviors. Other salient characteristics from phase three were love, harmony and appreciation, which are new themes that were found in this research. In the conclusion, we describe how there is a tendency to believe that change does not come easily, especially for adults, because our mental models rule our lives (subconsciously). However, in this study participants were all adults who observed their unknown assumptions (observing behaviors that were sabotaging their efforts to succeed in life) who also reported change in their lives and in perceptions of their world. The researchers implemented the MIA methodology by following its procedure (Vergara, 2016a). This shows the sustainability of the MIA methodology, as all participants were able to achieve the “third head”. In addition, during the implementation of the MIA methodology in the action research course at Columbia University, participants achieved the “third head” in person and online. Since participants were able to achieve the “third head” online this has expanded the possibilities to implement MIA globally.
10
Areiza Maria C. Lopez, Tavares Sergio S., Simão Renata A., and Rebello João Marcos A. "Detecting and Identifying Deleterious Phases in Lean Duplex Stainless Steel." In Studies in Applied Electromagnetics and Mechanics. IOS Press, 2014. https://doi.org/10.3233/978-1-61499-407-7-209.
Full textAbstract:
Lean duplex stainless steels (LDSS) are used due their corrosion resistance and mechanical strength in aggressive environments. However, a drawback can be pointed out: exposition to temperatures in the range 300&deg;C - 1000&deg;C may lead to precipitation of some deleterious phase, such as sigma (&sigma;). When this occurs, the material becomes brittle and its corrosion resistance is severely impaired. Past publications [1,2] showed how conventional eddy current tests (ECT) can be successfully applied to detecting and quantifying deleterious phases in duplex stainless steel (DSS). Due to the similarity of chemical composition and microstructure between these two steels, ECT will be applied to detect and quantify deleterious phases in LDSS. The results obtained in the present work showed to be promising for the understand of the LDSS material characterization, where a not linear behavior in the relationship between volumetric deleterious phases and ECT impedance plane phase angle is observed. Using a thoroughly magnetic force microscope (MFM) analysis of the samples studied, together with a kinetic precipitation model of secondary phases in DSS, it was possible to propose some explanation about these behavior [3].
Conference papers on the topic "MFA phase"
1
Singh, P., H. N. Frenier, E. R. Goldmann, et al. "Corrosion Mechanism in a Three-Phase North Slope Pipeline." In CORROSION 2013. NACE International, 2013. https://doi.org/10.5006/c2013-02824.
Full textAbstract:
Abstract A North Slope of Alaska facility separates three-phase flow (produced water, oil, and natural gas) from four drill sites. Each of the drill sites has a three-phase production line that flows to the central facility. One of the three-phase pipelines was inspected by a magnetic flux leakage (MFL) in-line inspection (ILI) tool in 2008. The inspection showed significant internal corrosion with features measured up to 37% of wall thickness loss primarily in first 1 mile from the drill site. Most of the significantly corroded features are located between 3-4 o’clock and 8-9 o’clock positions. The results of the 2008 MFL ILI, corrosion inhibitor partitioning tests, corrosion modeling, and multiphase flow simulations were used to determine the potential corrosion mechanism in the line and to recommend corrosion control measures. The mechanism was determined to be a special case of “top of the line corrosion”.
2
Gunaltun, Yves, Regis Piccardino, and Daniel Vinazza. "Interpretation of MFL and UT Inspection Results in Case of Top of Line Corrosion." In CORROSION 2006. NACE International, 2006. https://doi.org/10.5006/c2006-06170.
Full textAbstract:
Abstract In case severe corrosion is detected in a pipeline, repair or replacement can be very costly especially for offshore pipelines. The decision for the repair or replacement should be taken based on the accurate and validated inspection data. The fit for purpose analysis of oil and gas transport pipelines are based on the results of intelligent pigging. There are two types of pigs on the market used for this purpose: magnetic flux leakage (MFL) pigs and ultrasonic (UT) pigs. For the gas pipelines, MFL pigs are used as they do not require the presence of a liquid phase. However, visual inspections of some pipe sections done after some repairs carried out on the pipelines operated by the authors company, showed that MFL tools exaggerate significantly localised thickness losses for the wet gas lines subject to top of line corrosion (TLC). Several studies were initiated to compare the MFL, UT and visual &direct NDT inspection results. The study confirmed that MFL may exaggerate significantly (up 100 %) the thickness losses. Consequently the decision to repair or replace a line corroded by TLC can not be taken based on only MFL or UT results. It is always necessary to cross-check the inspection results by another technique. The paper presents different pipelines inspection cases, details of studies and weak and strong points of different pipeline inspection tools.
3
Pinappu, Sai Reddy, Kwadwo Sarpong, Corina Sandu, and Zhenning Gu. "Fast On-Site Quantification and Monitoring of Monoethanolamine in Crude Oils Using Field Asymmetric Ion Mobility Spectrometry." In CORROSION 2015. NACE International, 2015. https://doi.org/10.5006/c2015-05630.
Full textAbstract:
Abstract Triazine-based hydrogen sulfide (H2S) scavengers are the most commonly used additives in the oil and gas industry. One of the reaction products of the scavenging process is an organic amine. The organic amine by-product, together with amines in slop oil and the desalter wash water, are collectively referred to as “tramp amines.” The most-common tramp amines from the H2S scavenging process are mono-ethanolamine (MEA) and methylamine (MA). These tramp amines have the potential to react with hydrochloric acid (HCl) to form corrosive amine hydrochloride salts in the crude atmospheric distillation tower and overhead. Among these tramp amines, MEA has the highest potential of forming corrosive salts. To date, continuous monitoring for tramp amines has been limited to the bulk aqueous phase (sour water, brine, etc.) using ion chromatography (IC). This limitation not only presents a challenge with respect to turn-around time, it also prevents the refiner from taking proactive measures to mitigate amine hydrochloride salt deposition. This paper presents a field methodology for detection and quantification of MEA in the raw crude. Detection and quantification is achieved via the use of a field-deployable analyzer that uses field asymmetric ion mobility spectrometry (FAIMS). This approach enables quantification of MEA down to 1 ppm in crude oil. The combination of this fast, on-site quantification of MEA with ionic modeling enables the refiner to take timely corrective actions to mitigate MEA hydrochloride salt deposition.
4
Samani, Reza, and Yiyan Chen. "Corrosion Behavior of Carbon Capture Nonaqueous Solvent Compared to Monoethanolamine." In CONFERENCE 2025. AMPP, 2025. https://doi.org/10.5006/c2025-00320.
Full textAbstract:
A nonaqueous solvent (NAS) was developed for point-source carbon capture. This fluid utilizes a unique amine with a diluent that significantly improves specific reboiler heat duty. The corrosion rates of the new solvent in both vapor and liquid phases were evaluated in the laboratory under various conditions pertinent to carbon capture operations. The results were compared to those of a 30% monoethanolamine (MEA) solution under identical conditions. Laboratory experiments revealed that the NAS solvent is less corrosive than 30% MEA, particularly in the presence of oxygen (~0.05 mm/year in NAS vs. ~0.36 mm/year in MEA for C 1018 at 90 °C). The NAS solvent exhibits negligible corrosivity in the presence of the equilibrium amount of CO2 at lower temperatures, such as 40°C, which is approximately the operational temperature of the absorber. However, NAS corrosivity increases at higher temperatures, though it remains significantly lower than that of 30% MEA, especially for carbon steel. The corrosion rate of NAS is comparable to that of 30% MEA under continuous CO2 purging at high temperatures, such as 90°C. Based on these findings, many components of the capture plant can be constructed using carbon steel when employing NAS.
5
Zdańkowski, Piotr, Maksymilian Chlipała, Mikołaj Rogalski, and Maciej Trusiak. "Bedrosian theorem problem in quantitative phase imaging." In Digital Holography and Three-Dimensional Imaging. Optica Publishing Group, 2024. http://dx.doi.org/10.1364/dh.2024.m3a.2.
Full textAbstract:
In this study we highlight the significance of the Bedrosian theorem, stating that strong sample-induced amplitude variations can impact the result of the phase demodulation, challenging the often-overlooked assumptions in phase reconstruction.
6
Pollard, Lee, Adrian Belanger, and Tim Clarke. "Managing HIC Affected Pipelines Utilizing MFL Hard Spot Technology." In CORROSION 2004. NACE International, 2004. https://doi.org/10.5006/c2004-04172.
Full textAbstract:
Abstract When a pipeline operator considers the concept of pipeline integrity, conventional wisdom has led operators to believe that evaluation techniques should only be concerned with processes or conditions that may have affected pipeline integrity during the construction or operation phases of a pipeline's lifecycle. Due to unfortunate circumstances, pipeline incidents have become increasingly prevalent and the causation has not solely been attributed to these two factors. Non-homogeneous structural pipeline conditions created during the milling process have become an issue that pipeline operators must also consider when seeking to obtain a thorough evaluation of the integrity of their pipelines. The focus of this paper is to discuss the milling condition and characteristics known as hard spots (localized hardening) incurred purposefully and inadvertently during the pipeline milling process, the detrimental conditions that may exist along with a pipeline exhibiting hard spots, and the current technology available to detect, characterize, and quantify hard spots within a pipeline system.
7
Scholl, Bruno B., Ligia C. Palma, Victor S. Hariki, Maria Carolina Elias, and Marcelo S. Reis. "Tuning a predictive DNA replication programming computational model for Trypanosomatids." In Simpósio Brasileiro de Bioinformática. Sociedade Brasileira de Computação, 2024. https://doi.org/10.5753/bsb.2024.245608.
Full textAbstract:
In this paper, we report the tuning of a predictive DNA replication programming computational model for both Trypanosoma brucei and Trypanosoma cruzi, unicellular protozoan endoparasites that cause African sleeping sickness and Chagas disease, respectively. This is a stochastic dynamic model for simulating the DNA replication process with concomitant constitutive transcription, enabling the analysis of the interactions between replication and transcription in these organisms. Using Optuna, an open-source hyperparameter optimizer, we explored almost 5,000 parameter combinations across both trainings of the models, each with up to 1,000 simulations averaged as the output, yielding two models that deviate by only 7.9% and 5.55% compared to experimental MFA-Seq data for T. brucei and T. cruzi, respectively, according to the SMAPE metric. The results also indicate a pattern in both models, in which the head-on collisions between replication and transcription machineries are co-localized with bases replicated earlier in the S-phase. This work paves the way for further in silico experimental exploration, aiming to unravel underlying mechanisms of the DNA replication programming in trypanosomatids.
8
Johnson, Alexander D., Jacob Tamasy, James F. Fung, and Benjamin McMahon. "Development of Balanced TCDA for MFAs." In 2022 IEEE International Symposium on Phased Array Systems & Technology (PAST). IEEE, 2022. http://dx.doi.org/10.1109/past49659.2022.9975072.
Full text
9
Ochi, Hitoshi, and Atsutoshi Mizuide. "A Practical Example of Simulation Assisted Engineering and System Integrated Test for ABWR RIP-MFG System." In 17th International Conference on Nuclear Engineering. ASMEDC, 2009. http://dx.doi.org/10.1115/icone17-75257.
Full textAbstract:
In Advanced Boiling Water Reactor (ABWR) the recirculation flow is controlled by Reactor Internal Pumps (RIP). For the new construction ABWR plant, Hitachi-GE applied a Motor Fluid coupling Generator system as a power supply of RIPs (RIP-MFG system). In RIP-MFG system, one MFG supplies electric power to five RIPs and controls the speed of RIPs simultaneously. MFG is the highly reliable power supply system and can sustain power supply to RIPs against grid perturbation due to its large rotational inertia [1]. Application for RIP-MFG system to ABWR is world’s first case although both MFG in BWR and RIP in ABWR are proven technologies. Since the recirculation flow system is the key system determining plant operational performance, Hitachi-GE applied Simulation Assisted Engineering (SAE) for RIP-MFG system to get higher reliability for designing RIP-MFG system and keep a plant constructional schedule due to avoid “trial and error” in the start-up test. The design process was broken down into 3 design phases and 7 design steps as follows. Basic design phase consists of step 1 through step 3. Step 1, a simulation code (RIP-MFG code) which contains electronic and hydraulics models for RIP and MFG was developed. Step 2, basic simulation was performed with RIP-MFG code and general inputs. It was concluded that RIP-MFG system would be basically applicable to ABWR recirculation flow control. Step 3, the System Requirements Specification for RIP-MFG system and the component design specifications were documented based upon the simulation. Detail design phase consists of step 4 through step 6. Step 4, The RIP-MFG components were produced and the component level tests were performed. Step 5, RIP-MFG system integrated tests were performed. The objective of the integrated tests was to verify the system design and the RIP-MFG code. The RIP-MFG code outputs have good agreement with both steady state and transient test data. It has concluded that RIP-MFG code is verified. Step6, the RIP-MFG controller parameters are now being evaluated with the verified code. Final test phase consists of step 7. Step 7, the performances of ABWR with RIP-MFG system will be evaluated finally in the plant start-up test.
10
He, Ya-Ling, Zheng Miao, and Wen-Quan Tao. "Modeling of Heat Transport in a Direct Methanol Fuel Cell With Anisotropic Gas Diffusion Layers." In 2010 14th International Heat Transfer Conference. ASMEDC, 2010. http://dx.doi.org/10.1115/ihtc14-22102.
Full textAbstract:
A non-isothermal two-dimensional two-phase numerical model is developed in this paper to investigate the heat generation and transport processes in a direct methanol fuel cell with anisotropic gas diffusion layers (GDLs). Thermal contact resistances at the GDL/CL (catalyst layer) and GDL/Rib interfaces, and the deformation of GDLs are considered together with the inherent anisotropy of the GDL. Latent heat effects due to condensation/evaporation of water and methanol between liquid and gas phases are also taken into account. Formulation of the two-phase mass transport across the membrane electrode assembly (MEA) is mainly based on the classical multiphase flow theory in the porous media. The numerical results show that the overall heat flux in MEA is mainly contributed to heat generation in anode and cathode CLs. And the three anisotropic factors of the GDLs, including the inherent anisotropy, the spatially varying contact resistances, and the deformation of GDLs, have a strong impact on the heat transport processes in the DMFC by altering the distribution of temperature across the MEA.
Reports on the topic "MFA phase"
1
Gao, Krishnamurthy, and McNealy. L52313 Performance Improvements of Current ILI Technologies for Mechanical Damage Detection Phase 2. Pipeline Research Council International, Inc. (PRCI), 2009. http://dx.doi.org/10.55274/r0010681.
Full textAbstract:
This final report provides a comprehensive and in-depth review of the current status of in-line inspection technologies including, but not limited to, Magnetic (Axial MFL, Circumferential MFL), and Geometrical (Caliper) methods in terms of their capabilities, limitations and potentials in detection, discrimination and characterization of various forms of pipeline mechanical damage, such as dents, dents with corrosion, and dents with cracks, gouges and dents with gouges. Capabilities of current technologies presented herein are based on validation data supplied by PRCI members. This report reviews and summarizes research regarding the capabilities of current in-line inspection (ILI) based technologies for the detection and discrimination of mechanical damage conducted by Blade Energy Partners in cooperation with participating ILI vendors and PRCI member pipeline operators. This research was conducted in two phases. The first identified the current deployed ILI technologies, vendor claims for capability and performance determination with validation data provided by the ILI vendors. Standardized performance measures were also developed and applied. The Phase I research was presented in an incomplete report, PR-328-063502-R01.
2
Rosito, Tatiana, and Robert Z. Lawrence. A New Compensation Mechanism for Preference Erosion in the Doha Round. Inter-American Development Bank, 2006. http://dx.doi.org/10.18235/0011040.
Full textAbstract:
In this paper we explore a proposal to backload the phase-in of MFN tariff reductions in sensitive sectors and use the revenues generated to provide compensation for preference erosion. We argue that the approach would be both equitable and effective.
3
Vyvial, Brent. PR-201-183830-R01 Evaluating Low Field MFL in Measuring Loading Conditions at Branch Connections - Phase 2. Pipeline Research Council International, Inc. (PRCI), 2019. http://dx.doi.org/10.55274/r0011597.
Full textAbstract:
Unsupported branch connections or branch connections under loads due to unstable support conditions can be an integrity threat and potential failure location in pipelines. No industry accepted method currently exists to assist operators in identifying problematic branch connections in a measurably-reliable way. Low field magnetic flux leakage (LF-MFL) offers one potential method to identify stressed sections of pipeline. The purpose of this project was to evaluate the ability of LF-MFL in-line inspection (ILI) technology to characterize loading conditions around branch connections and to validate the use of LF-MFL ILI to identify stressed branch connections. The results of this work will provide operators with guidance for using LF-MFL ILI tools to identify integrity threats.
4
Vaucher, Gail, Jeffrey Swanson, John Raby, et al. Meteorological Sensor Array (MSA) - Phase I Volume 1 (Proof of Concept" Overview)". Defense Technical Information Center, 2014. http://dx.doi.org/10.21236/ada608929.
Full text
5
Vaucher, Gail, and Robert Edmonds. Meteorological Sensor Array (MSA)-Phase I. Volume 3 (Pre-Field Campaign Sensor Calibration). Defense Technical Information Center, 2015. http://dx.doi.org/10.21236/ada622325.
Full text
6
Dinovitzer, Aaron. PR-214-153739-WEB ERW Fatigue Life Integrity Management Improvement - Phase III. Pipeline Research Council International, Inc. (PRCI), 2019. http://dx.doi.org/10.55274/r0011614.
Full textAbstract:
Tuesday, September 17, 2019 11:00 a.m ET PRESENTER: Aaron Dinovitzer, MA Sc., MBA, PEng, BMT Canada HOST: Mark Piazza, Colonial Pipeline Company MODERATOR: John Lynk, PRCI CLICK THE BUY/DOWNLOAD BUTTON TO ACCESS THE WEBINAR REGISTRATION LINK Join the PRCI Integrity and Inspection Technical Committee as they present research results that set out to evaluate the level of conservatism inherent to current state-of-practice procedures using full-scale fatigue testing. Learning outcomes/benefits of attending: - Understand the sources of conservatism, and how to improve the accuracy of, fatigue life estimation techniques for ERW or EFW pipes containing manufacturing process induced crack-like features. - Learn about an improved estimation method of remaining pipe fatigue life estimates that better agree with actual operational experience. This can reduce conservatism in engineering fatigue life estimates over currently used techniques. - Since fatigue life estimates are used to identify inspection intervals and assessing the life of features in a pipeline system, reducing unnecessary conservatism will avoid the cost of unnecessary inspections, pressure tests and repairs before fatigue life is expended. Who should attend? - Pipeline integrity and risk personnel, engineers and management Recommended pre-reading: PR-214-153739-R01 ERW Fatigue Life Integrity Management Improvement - Phase III Register anyway to automatically receive a link to the webinar recording to view on-demand at your convenience. After registering, you will receive a confirmation email containing information about joining the webinar.
7
Bubenik, Tom, and Brian Riley. PR-186-183825-R01 Continuous Improvement of ILI Capabilities Joint Industry Project (Phase I). Pipeline Research Council International, Inc. (PRCI), 2019. http://dx.doi.org/10.55274/r0011620.
Full textAbstract:
The American Petroleum Institute (API) and Association of Oil Pipe Lines (AOPL)'s Research and Development Work Group (RDWG) and PRCI are undertaking a joint industry project to develop pull test strings and protocols to validate and test the performance specifications published for ultrasonic crack detection, electromagnetic acoustic transducer (EMAT), and spiral and circumferential magnetic flux leakage (MFL) in-line inspection (ILI) tools. The purpose of the joint industry project is to assess the current industry specifications and improve ILI crack tool capabilities. DNV GL served as the project manager for Phase I of the joint industry project. This report summarizes the work completed in Phase I, which covered evaluating test facilities and methods of manufacturing crack-like defects, developing a preliminary defect set design and test protocol, and soliciting ILI vendor support.
8
Miller. L51699 Diverless Pipeline Repair Clamp Phase III. Pipeline Research Council International, Inc. (PRCI), 1993. http://dx.doi.org/10.55274/r0010218.
Full textAbstract:
Offshore oil and gas developments are underway for water depths beyond which divers can function. The economic lifelines of these projects are the pipelines which will transport the products to shore. In preparation for the day when one of these pipelines will require repair because of a leak, the Pipeline Research Committee of Pipeline Research Council International, Inc. is funding research directed at developing diverless pipeline repair capabilities. This Report summarizes the results of the third and final phase of this project. Phase III work included design, manufacture, and dry testing of 1) a one-half scale model of a 12"� repair clamp, 2) a full-scale bolt test fixture to demonstrate boltcontainment and startup under realistic misalignment of the clamp halves, and 3) a full-scale one-way cylinder for end seal activation. Engineering drawings for a 12" - 900# (324 mm, 15.3 mPa) diverless repair clamp package were also produced, and are provided with this report in Appendix B. Phase III also included a study commissioned from Oceaneering directed at defining the interfaces of the clamp package and the ROV, including suggested procedures for deployment and positioning of the clamp package on the pipeline. Issues regarding bolt make-up by the ROV were also studied in detail and limitations in bolting capability were outlined.
9
Seiple, Timothy, Andre Coleman, Craig KR Bakker, Chrissi Antonopoulos, and Andrew White. W-SMART Phase-I Pathway Analysis: Case Study - City of Boston, MA. Office of Scientific and Technical Information (OSTI), 2023. http://dx.doi.org/10.2172/2338095.
Full text
10
Gurung, Bijan, J. Hutchinson, Brian Peterson, et al. Exploring spatial patterns of overflights at Olympic National Park. National Park Service, 2024. http://dx.doi.org/10.36967/2304991.
Full textAbstract:
This study explored spatial patterns of overflights at Olympic National Park (OLYM). Overflights were analyzed from July 27th, 2021 to January 2nd, 2023 using Automatic Dependent Surveillance-Broadcast (ADS-B) data with a total of 525 days of data. Data were collected using data loggers that were deployed at Blyn (located outside of OLYM), Hurricane Ridge, and Hoh Rain Forest. The first phase of analysis focused on all overflights and found a high concentration of overflights above the northeastern portion of OLYM, and definitive flight corridors were identified across the park. The second phase of analysis focused on low-level overflights that fly below 10,500 ft mean sea level (MSL) and fly within 10 miles of the OLYM boundary. Phase 2 figures display four figures based on seasons and show a concentration of flights between 6,001?10,500 ft MSL except in and around the Port Angeles area where there is a concentration of flights in the 0?6,000 ft MSL altitudinal range. The third phase of analysis selected all low-level overflights below 2,500 ft above ground level (AGL) and within 0.5-mile of the OLYM boundary. Kernel density analysis was conducted using waypoints segmented into 500 ft above ground level (AGL) altitude intervals from 0?2,500 ft AGL. The altitude interval with the highest density of overflights was ?0?500 ft AGL?. Kernel density hot spots were observed along the flight corridor and over Port Angeles. Also, overflights flown by known air tour operators and park administration were shown. Overflight patterns of air tour operators mostly follow the recommended air tour route. Lastly, overflights intersecting with Olympic Military Operations Area (MOA) were identified and mapped. This information can be used for planning and management purposes and this study serves as a resource for future research that intends to use more advanced analytics.