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Статті в журналах з теми "Contacted phases"
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Yorkshire, Antonia S., Martin C. Stennett, Brant Walkley, Sarah E. O'Sullivan, Lucy M. Mottram, Daniel J. Bailey, John L. Provis, Neil C. Hyatt, and Claire L. Corkhill. "Spectroscopic evaluation of UVI–cement mineral interactions: ettringite and hydrotalcite." Journal of Synchrotron Radiation 29, no. 1 (January 1, 2022): 89–102. http://dx.doi.org/10.1107/s1600577521011553.
Повний текст джерелаАнотація:
Portland cement based grouts used for radioactive waste immobilization contain high replacement levels of supplementary cementitious materials, including blast-furnace slag and fly ash. The minerals formed upon hydration of these cements may have capacity for binding actinide elements present in radioactive waste. In this work, the minerals ettringite (Ca6Al2(SO4)3(OH)12·26H2O) and hydrotalcite (Mg6Al2(OH)16CO3·4H2O) were selected to investigate the importance of minor cement hydrate phases in sequestering and immobilizing UVI from radioactive waste streams. U L III-edge X-ray absorption spectroscopy (XAS) was used to probe the UVI coordination environment in contact with these minerals. For the first time, solid-state 27Al magic angle spinning nuclear magnetic resonance (MAS-NMR) spectroscopy was applied to probe the Al coordination environment in these UVI-contacted minerals and make inferences on the UVI coordination, in conjunction with the X-ray spectroscopy analyses. The U L III-edge XAS analysis of the UVI-contacted ettringite phases found them to be similar (>∼70%) to the uranyl oxyhydroxides present in a mixed becquerelite/metaschoepite mineral. Fitting of the EXAFS region, in combination with 27Al NMR analysis, indicated that a disordered Ca- or Al-bearing UVI secondary phase also formed. For the UVI-contacted hydrotalcite phases, the XAS and 27Al NMR data were interpreted as being similar to uranyl carbonate, that was likely Mg-containing.
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SOLLER, H., and D. BREYEL. "SIGNATURES IN THE CONDUCTANCE FOR PHASE TRANSITIONS IN EXCITONIC SYSTEMS." Modern Physics Letters B 27, no. 25 (September 23, 2013): 1350185. http://dx.doi.org/10.1142/s0217984913501856.
Повний текст джерелаАнотація:
In this paper, we analyze two phase transitions in exciton bilayer systems: a topological phase transition to a phase which hosts Majorana fermions and a phase transition to a Wigner crystal. Using generic simple models for different phases, we discuss the conductance properties of the latter when contacted to metallic leads and demonstrate the possibility to observe the different phase transitions by simple conductance measurements.
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Stanescu, Tudor D., Anna Sitek, and Andrei Manolescu. "Robust topological phase in proximitized core–shell nanowires coupled to multiple superconductors." Beilstein Journal of Nanotechnology 9 (May 22, 2018): 1512–26. http://dx.doi.org/10.3762/bjnano.9.142.
Повний текст джерелаАнотація:
We consider core–shell nanowires with prismatic geometry contacted with two or more superconductors in the presence of a magnetic field applied parallel to the wire. In this geometry, the lowest energy states are localized on the outer edges of the shell, which strongly inhibits the orbital effects of the longitudinal magnetic field that are detrimental to Majorana physics. Using a tight-binding model of coupled parallel chains, we calculate the topological phase diagram of the hybrid system in the presence of non-vanishing transverse potentials and finite relative phases between the parent superconductors. We show that having finite relative phases strongly enhances the stability of the induced topological superconductivity over a significant range of chemical potentials and reduces the value of the critical field associated with the topological quantum phase transition.
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Jensma, Jeanne L., Patricia L. Pike, Cheryl L. Duerksen, and Gary H. Strauss. "The importance and the Difficulty of Doing Research with a Missionary Population." Journal of Psychology and Theology 25, no. 3 (September 1997): 384–87. http://dx.doi.org/10.1177/009164719702500307.
Повний текст джерелаАнотація:
In a recent study, 50 mission boards were contacted and over 300 first-term missionary appointees were asked to participate in research on the predictive validity of the Cross-Cultural Adaptability Inventory. The research took place in two phases: one before the missionaries left for their respective fields and the second after approximately six months on the field. Fifty missionaries agreed to participate in the study and met the qualifications for doing so. By the end of the second phase of the research, however, only 14 missionaries had completed the study with no missing inventories. This research note highlights both the importance of doing research among missionaries and the difficulties encountered in the process.
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Liu, Hong Wei. "Influence of Powder Preparation Technology on In Situ Reactive Synthesized Ti (C,N)-TiB2 Composite Ceramics." Advanced Materials Research 744 (August 2013): 334–38. http://dx.doi.org/10.4028/www.scientific.net/amr.744.334.
Повний текст джерелаАнотація:
Mechanical adhesion method and precursor method were used to prepare Ti-B4C-C and Ti-B4C-Sucrose composite powders respectively with Ti, B4C, graphite and sucrose (precursor of C) as raw materials. Ti (C,N)-TiB2 composite ceramic preforms were prepared with the two kinds of powders by self-reactive spray forming technology. The compositions and microstructure were analyzed and observed by means of XRD and SEM. The porosity and fracture toughness of the preforms were tested. Then the influence of powder preparation technology on the microstructure and properties of the preforms were contrastively analyzed. It was shown that compared with Ti-B4C-C composite powders, Ti-B4C-Sucrose composite powders had lower interior adhesive strength, but the different composition among them mixed more uniformly and contacted tighter, which made the SHS reaction of them during the spray forming process take place more sufficiently. The two kinds of preforms were both composed of Ti (C,N)-TiB2 main phases, titanium oxide by-product phases and some pores. Whereas there were less kinds and content of by-product phases in the preforms prepared with Ti-B4C-Sucrose powders, and the materials were uniform and dense, with higher fracture toughness. The general properties of the preforms were obviously better than that of the preforms prepared with Ti-B4C-C composite powders.
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Das Gupta, K., A. F. Croxall, J. Waldie, C. A. Nicoll, H. E. Beere, I. Farrer, D. A. Ritchie, and M. Pepper. "Experimental Progress towards Probing the Ground State of an Electron-Hole Bilayer by Low-Temperature Transport." Advances in Condensed Matter Physics 2011 (2011): 1–22. http://dx.doi.org/10.1155/2011/727958.
Повний текст джерелаАнотація:
Recently, it has been possible to design independently contacted electron-hole bilayers (EHBLs) with carrier densities cm2in each layer and a separation of 10–20 nm in a GaAs/AlGaAs system. In these EHBLs, the interlayer interaction can be stronger than the intralayer interactions. Theoretical works have indicated the possibility of a very rich phase diagram in EHBLs consisting of excitonic superfluid phases, charge density waves, and Wigner crystals. Experiments have revealed that the Coulomb drag on the hole layer shows strong nonmonotonic deviations from a behaviour expected for Fermi-liquids at low temperatures. Simultaneously, an unexpected insulating behaviour in the single-layer resistances (at a highly “metallic” regime with ) also appears in both layers despite electron mobilities of above and hole mobilities over . Experimental data also indicates that the point of equal densities () is not special.
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Virga, V., KA Houpt, and JM Scarlett. "Efficacy of amitriptyline as a pharmacological adjunct to behavioral modification in the management of aggressive behaviors in dogs." Journal of the American Animal Hospital Association 37, no. 4 (July 1, 2001): 325–30. http://dx.doi.org/10.5326/15473317-37-4-325.
Повний текст джерелаАнотація:
The efficacy of amitriptyline as a pharmacological adjunct to behavioral modification in the clinical management of aggressive behaviors in dogs was evaluated in two phases. Twelve dogs presenting for aggressive behaviors were treated sequentially with amitriptyline (2 mg/kg body weight, per os [PO] bid) and a placebo for 4 weeks in a prospective, randomized, double-blind, placebo-controlled trial. Standardized protocols for behavior modification were implemented throughout the trial. Owners maintained behavioral records and reported on the number of aggressive incidents as well as the dog's overall improvement at the end of each 4-week period. In the second phase, 27 cases of dogs presenting for aggressive behaviors and treated with amitriptyline were reviewed, and clients were contacted to record each dog's response to treatment. Reports were compared to those for dogs receiving behavior modification alone (i.e., placebo phase of prospective study). No significant difference was observed in the patients' responses to adjunctive amitriptyline versus behavior modification alone.
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Pople, Vedant, Ayush Kanaujia, R. Vijayan, and V. Mareeswari. "Face Mask Detection for Real Time Video Streams." ECS Transactions 107, no. 1 (April 24, 2022): 8275–87. http://dx.doi.org/10.1149/10701.8275ecst.
Повний текст джерелаАнотація:
The Face Mask Detection model is used to make sure a person is wearing a mask or not. This model results from the grappling situation presented by COVID-19, resulting in the mandatory use of masks at public places. Security agencies need to plant actual personnel to make sure all the people in public are wearing ‘masks’, this model will lessen the risk of people being contacted by COVID-19. This research helps us understand a broader perspective about the Face Mask Detection models by comparing different state of the art models. The model uses MobileNetV2 architecture that has inverted bottlenecks and depth-wise convolutions to filter features. The complete model is built in two phases, the first one consisting of making a Face Mask Detection model trained to detect the face and mask, and then placing it in the Real Time environment by using the OpenCV for actually predicting the usage of face mask.
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Xie, Yanyan, Mengya Gao, Yang Liu, Qiang Fu, Guoliang Wang, Yujie Dai та Shiru Jia. "Interaction of Zn(II) and Cu(II) with ε-poly-L-lysine and properties of the complexes". E3S Web of Conferences 131 (2019): 01003. http://dx.doi.org/10.1051/e3sconf/201913101003.
Повний текст джерелаАнотація:
ε-Poly-L-lysine (ε-PL) is a natural food preservative with high safety to humans and a wide antimicrobial spectra. It was found that ε-PL could form precipitates when it contacted to Cu(II) and Zn(II). Thus in this study, two complexes of ZnCl2 and CuCl2 with ε-poly-L-lysine having molecular weights between 2 and 5 kDa were prepared and characterized by elemental analysis (EA), atom absorption spectrometry (AAS), chlorine assay, etc. The results show that the compositions of two complexes can be expressed as [ NH-(CH2)5-CO ] 2n•(ZnCl2)n•2nH2O and [ NH-(CH2)5-CO ] 2n•(CuCl2)n•2nH2O (n=6-18), respectively. The results of FT-IR reveal that the formation of Zn-N and Cu-N coordination bonds. X-RD patterns indicat that the two complexes are new phases different from the raw ε-PL material. On the basis of TG-DTA curves, the complexes have a coordination reaction. From the results of the bacteriostatic test, ε-PL-Zn(II) and ε-PL-Cu(II) have similar antibacterial activity to ligand ε-PL.
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Bergamasco, Massimo, A. A. Alessi, and M. Calcara. "Thermal Feedback in Virtual Environments." Presence: Teleoperators and Virtual Environments 6, no. 6 (December 1997): 617–29. http://dx.doi.org/10.1162/pres.1997.6.6.617.
Повний текст джерелаАнотація:
This work refers to the study of thermal contact phenomena modeling for tactile feedback in virtual environments applications. The results of the modeling aspects for thermal replication are collected in specific functions that are used by the renderer of a virtual application. The finger temperature distribution versus time and contacted object temperature are the fundamental ways to approach, according to a specific modeling technique, the computation of the contact temperature occurring at the interface between the virtual hand and virtual object. Finger temperature distribution is then used for the control of thermal effectors. The modeling of the spatial and temporal distribution of the temperature in the human finger, when contact occurs with an external object at a defined temperature, is carried out in two phases: (a) determination of the temperature distribution in the finger when no contact is detected; and (b) determination of the temperature distribution in the finger when contact is detected. Results of the modeling are given and a procedure describing how these results can be used in the framework of a real application is presented.
Дисертації з теми "Contacted phases"
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Никольский, Валерий Евгеньевич. "Синергетические реакционно-массообменные процессы в газожидкостных аппаратах и топливных агрегатах химической технологии". Thesis, Украинский государственный химико-технологический университет, 2016. http://repository.kpi.kharkov.ua/handle/KhPI-Press/24524.
Повний текст джерелаАнотація:
Диссертация на соискание ученой степени доктора технических наук по специальности 05.17.08 – процессы и оборудование химической технологии. – Национальный технический университет "Харьковский политехнический институт" Министерства образования и науки Украины, Харьков, 2016 г.
Диссертационная работа посвящена решению актуальной инжиниринговой научно-технической проблемы: разработать современные энергоэффективные экологически чистые технологии, средства генерирования и потребления тепловой энергии с применением систем рекуперации теплоты на основе синергетического единства аппаратурно-технологического оформления процессов и системного подхода. В работе разработаны научно-методологические основы и практические способы повышения эффективности использования топлива в газожидкостных аппаратах и топливных агрегатах химической технологии за счет интенсификации тепловых процессов в их рабочем пространстве. С позиции совершенствования топливо– и материалосберегающих техники и технологий созданы новые конструкции газожидкостных аппаратов и топливных агрегатов. На их основе синтезированы экологически чистые энергоэффективные технологические системы (ЭТС), приемлемые для химической технологии и других сфер промышленности, коммунального, сельского хозяйства, отвечающие современным энергетическим и экологическим требованиям. Систематизированы методы интенсификации гетерогенных процессов в теплотехнологических аппаратах; предложены новые перспективные РТ и АК методы интенсификации и обоснована целесообразность их практического использования при синтезе новых ЭТС на базе синергетически совмещенных реакционно-разделительных процессов (обеспечение неоднофазности, наложение электрических и магнитных полей на контактирующие фазы, оптимизация параметров пульсаций в гетерогенных системах, одно- и многотипное комбинирование теплогенерирующих аппаратов, обеспечение многократных входных и концевых эффектов, соударения, закручивания, взаимной эжекции контактирующих фаз и их осциллирования, циклический подвод энергии). Разработанные и приведенные в диссертации аппараты, технологические процессы и оборудование широко внедрены на предприятиях Минхимпрома, Минметаллургии, Минавтопрома, Минкоммунхоза Украины и стран СНГ.A thesis for Doctor of Technical degree, specialty 05.17.08 – process and equipments of chemical technology. – National Technical University "Kharkiv Polytechnic Institute" Ministry of Education and Science of Ukraine, Kharkiv, 2016. The thesis deals with the improvement of actual engineering science-technical problem: the development of the modern energy effective ecological technologies, the means of energy generation and consumption using the heat recuperation systems on the base of synergetic unity of hardware implementation of the processes and system approach. For that the methodological fundamentals and practical methods of increasing of fuel utilization efficiency in the gas-liquid apparatuses and in the fuel combustion units of chemical technology at the expense of heat processes intensification were developed. Looking for improvements in fuel efficiency and materials saving the new constructions of gas-liquid apparatuses and fuel combustion units were created. On this base the ecological and energy efficiency technological systems were synthesized. They confirm to the requirements of modern power engineering and they are acceptable for the chemical technology and the other industries, as well as for communal services and agriculture. The high-effective contact-module system was developed. It was equipped with the immersion combustion apparatuses with multiple phase inversion and oscillation modulating of contacted phases. The system can be used for heat supply of industrial and agricultural buildings, apartment houses without using boilers with heat utilization of combustion products, when heat rating of 200, 400, 600, 1000, 2000 kWt is assumed, depending a need for generated heat. The expenses for complex structures and buildings’ heating using the development are decreased by 2,5 – 2,8 times in comparison with the traditional means. Contact-module system has stood the government heat-ecological test, which confirmed its high efficiency, ecological compatibility, serviceability. Construction standard specifications for serial production in the different branches of economy were obtained. The developed and presented in the thesis apparatuses, technological processes and equipments were applied in chemistry, metallurgy, motor-car industries and in communal services in Ukraine and CIS countries.
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Нікольський, Валерій Євгенович. "Синергетичні реакційно-масообмінні процеси в газорідинних апаратах і паливних агрегатах хімічної технології". Thesis, НТУ "ХПІ", 2016. http://repository.kpi.kharkov.ua/handle/KhPI-Press/24517.
Повний текст джерелаАнотація:
Дисертація на здобуття наукового ступеня доктора технічних наук за спеціальністю 05.17.08 – процеси та обладнання хімічної технології. – Національний технічний університет "Харківський політехнічний інститут" Міністерства освіти і науки України, Харків, 2016 р.
Дисертаційна робота присвячена вирішенню актуальної інжинірингової науково-технічної проблеми: розробити сучасні енергоефективні екологічно чисті технології, засоби генерування та споживання теплової енергії із застосуванням систем рекуперації теплоти на основі синергетичної єдності апаратурно-технологічного оформлення процесів і системного підходу. У роботі розроблено науково-методологічні основи та практичні способи підвищення ефективності використання палива в газорідинних апаратах і паливних агрегатах хімічної технології за рахунок інтенсифікації теплових процесів в їх робочому просторі. З позиції вдосконалення паливо- і матеріалозберігаючих техніки і технологій створено нові конструкції газорідинних апаратів і паливних агрегатів. На їх основі синтезовано екологічно чисті енергоефективні технологічні системи (ЕТС), прийнятні для хімічної технології та інших сфер промисловості, комунального, сільського господарства, які відповідають сучасним енергетичним та екологічним вимогам. Розроблено високоефективну контактно-модульну систему (КМС), обладнану апаратами зануреного горіння (АЗГ) з багатократною інверсією і модуляцією коливань контактуючих фаз для потреб теплопостачання промислових будівель і споруд, житлових і сільськогосподарських комплексів, яка виключає використання котельних і бойлерних установок з утилізацією теплоти продуктів згоряння, тепловою потужністю 200, 400, 600, 1000, 2000 кВт і вище залежно від потреби в генерованій теплоті. Витрати на обігрівання будівель і споруд при використанні пристрою знижуються в 2,5-2,8 рази в порівнянні з традиційними способами обігрівання. КМС пройшла державні тепло-екологічні випробування, які підтвердили її високу енергоефективність, екологічність, надійність в роботі. Отримано технічні умови на серійне її виготовлення і експлуатацію в різних галузях народного господарства. Розроблені і наведені в дисертації апарати, технологічні процеси і устаткування широко впроваджені на підприємствах Мінхімпрому, Мінметалургіі, Мінавтопрому, Мінкомунгоспу України та країн СНД.A thesis for Doctor of Technical degree, specialty 05.17.08 – process and equipments of chemical technology. – National Technical University "Kharkiv Polytechnic Institute" Ministry of Education and Science of Ukraine, Kharkiv, 2016. The thesis deals with the improvement of actual engineering science-technical problem: the development of the modern energy effective ecological technologies, the means of energy generation and consumption using the heat recuperation systems on the base of synergetic unity of hardware implementation of the processes and system approach. For that the methodological fundamentals and practical methods of increasing of fuel utilization efficiency in the gas-liquid apparatuses and in the fuel combustion units of chemical technology at the expense of heat processes intensification were developed. Looking for improvements in fuel efficiency and materials saving the new constructions of gas-liquid apparatuses and fuel combustion units were created. On this base the ecological and energy efficiency technological systems were synthesized. They confirm to the requirements of modern power engineering and they are acceptable for the chemical technology and the other industries, as well as for communal services and agriculture. The high-effective contact-module system was developed. It was equipped with the immersion combustion apparatuses with multiple phase inversion and oscillation modulating of contacted phases. The system can be used for heat supply of industrial and agricultural buildings, apartment houses without using boilers with heat utilization of combustion products, when heat rating of 200, 400, 600, 1000, 2000 kWt is assumed, depending a need for generated heat. The expenses for complex structures and buildings’ heating using the development are decreased by 2,5 – 2,8 times in comparison with the traditional means. Contact-module system has stood the government heat-ecological test, which confirmed its high efficiency, ecological compatibility, serviceability. Construction standard specifications for serial production in the different branches of economy were obtained. The developed and presented in the thesis apparatuses, technological processes and equipments were applied in chemistry, metallurgy, motor-car industries and in communal services in Ukraine and CIS countries.
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Herbaut, Rémy. "Dynamique des liquides sur substrat froid, avec solidification." Thesis, Sorbonne Paris Cité, 2019. http://www.theses.fr/2019USPCC006.
Повний текст джерелаАнотація:
Nous étudions l’étalement de liquides sur une surface froide, avec solidification. L’application visée est le secteur aéronautique qui est confronté à des problèmes de givrage lorsque l’avion est au sol. Le dégivrage s’effectue actuellement par un jet d’éthylène glycol, qui contribue à un surcoût pour les compagnies et une pollution non négligeable. Nos objectifs portent tout d’abord sur des questions fondamentales d’étalement d’une goutte sur un substrat à une température inférieure à la température de solidification. Sur une surface donnée, est-on capable de prédire si la goutte se solidifie ou s’étale dès son impact ? Quelles sont les formes prises par celle-ci, avant, pendant et après la solidification? Quel est le mécanisme de solidification et son influence sur la dynamique d’étalement ? Quel sont les paramètres qui contrôlent la dynamique des processus mis en jeu ? Plusieurs dispositifs et modélisations seront mis en œuvre en vue d’apporter des éléments de réponses à ces questions. Nos objectifs portent aussi sur des stratégies en vue d’éviter la congélation des gouttes et leur permettre de glisser avant leur congélation. La mise en oscillation d’une goutte ou le greffage de polymère en vue modifier l’état de surface seront également envisagés. Cette thèse tente d’apporter quelques éléments de compréhension nouveaux en se concentrant sur deux types d’écoulements très différent. Premièrement, l’avancée d’une ligne de contact en présence de solidification. Deuxièmement, la croissance d’une goutte solide sous alimentation continue en liquideWe study the liquids spreading on cold substrate, with solidification. The intended application is the aeronautical sector, which faces icing problems when the aircraft is on the ground. The deicing is currently carried out by an ethylene glycol jet, which contributes to an additional cost for the companies and a significant pollution. Our objectives focus on fundamental issues of spreading a drop on a substrate at a temperature below the solidification temperature. On a given surface, is it possible to predict whether the drop solidifies or spreads as soon as it is impacted ? What are the forms taken by it, before, during and after solidification? What is the solidification mechanism and its influence on the spreading dynamics? What are the parameters that control the dynamics of the processes involved ? Several devices and models will be implemented to provide some answers to these questions. Our goals also include strategies to avoid freezing drops and allowing them to slide before freezing. Oscillation of a droplet or grafting of polymer to modify the surface condition will also be considered. This thesis attempts to bring some new elements of understanding by focusing on two very different types of flows. First, the advance of a line of contact in the presence of solidification. Second, the growth of a solid drop under continuous liquid feed
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Députier, Stéphanie. "Metallurgie des contacts metal-semiconducteur iii-v : DIAGRAMME DE PHASES ET INTERDIFFUSION EN PHASE SOLIDE DANS LES SYSTEMES Ni/A1AS ET Er/GaAs." Rennes 1, 1992. http://www.theses.fr/1992REN10039.
Повний текст джерелаАнотація:
Dans la technologie des semiconducteurs (sc) iii-v, la fabrication reproductible de contacts metal/sc fiables et de bonne qualite reste un probleme imparfaitement resolu. En principe, un tel contact peut etre obtenu par interdiffusion en phase solide d'une couche mince de metal avec le sc. Mais, contrairement au silicium, la presence d'un semiconducteur compose introduit la possibilite de formation de phases ternaires. Aussi, la necessite absolue de la determination experimentale du diagramme ternaire m-iii-v pour comprendre et interpreter les sequences de formation des phases obtenues par interdiffusions en couches minces a-t-elle ete clairement mise en evidence. Les diagrammes ternaires ni-al-as et er-ga-as ont ete determines a 800c et caracterises par diffraction x, microscopie electronique a balayage et microsonde de castaing. Seul le diagramme ni-al-as montre l'existence de phases ternaires originales derivees de la structure-type nias. Les interdiffusions en phase solide entre un film metallique (ni,er) et le substrat (alas, gaas), apres traitements thermiques entre 200 et 800c ont ete caracterisees par diverses techniques complementaires d'analyse (diffraction x, rbs, met, mesure de resistivite). Lors de ces deux etudes, le metal depose sur le sc ne conduit pas a la formation de composes ternaires stables et epitaxies, mais a des melanges de binaires et ternaires fortement textures. Les binaires epitaxies nial et eras apparaissent comme des candidats potentiels pour la formation de contacts stables m/sc iii-v. Pour la realisation d'heterostructures sc/m/sc, les arseniures de terres rares presentent toutefois des avantages non negligeables sur les composes metaux de transition-elements iii
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Martin, Sylvain. "Contribution à la modélisation du frittage en phase solide." Thesis, Compiègne, 2014. http://www.theses.fr/2014COMP2144/document.
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Cette thèse traite de la modélisation du frittage à l’échelle du Volume Élémentaire Représentatif de la pastille de matériau. L’objectif est de développer des outils numériquesde compréhension des phénomènes physiques mis en jeu lors du frittage. Le domaine d’application ciblé est la fabrication du combustible nucléaire. Une approche multi-Échelle a été mise en oeuvre. Dans un premier temps une modélisation à l’échelle d’un empilement, basée sur la méthode des Éléments Discrets, a été adoptée. Différentes études utilisant cette approche ont été proposées dans la littérature ces dernières années. Tous ces travaux utilisent une méthode discrète explicite. Si certains résultats ont pu être validés expérimentalement,une des limites vient de l’utilisation des méthodes explicites dontle pas de temps critique est très petit. Afin d’augmenter le pas de temps, la masse des particules y est augmentée artificiellement de plusieurs ordres de grandeur. Or,il a été démontré que cette pratique conduit, dans certains cas, à une diminution du réarrangement des particules au sein de l’empilement. Dans cette thèse, une méthode Éléments Discrets implicite appelée Dynamique des Contacts a été adaptée au frittage. Elle permet l’utilisation d’un pas de temps très supérieur à celui des méthodes discrètes explicites et ne nécessite pas d’augmenter artificiellement la massedes particules. La comparaison entre la Dynamique des Contacts et la Méthode des Éléments Discrets explicite montre que notre approche conduit à une représentation plus fidèle du réarrangement. Une validation expérimentale par Microtomographie X ainsi qu’une étude paramétrique sur le frittage des poudres bidispersés sont également présentées pour montrer les possibilités de l’approche discrète appliquée au frittage.La seconde partie est consacrée à une modélisation à l’échelle de deux particules parla méthode des Éléments Finis. Ce modèle repose sur une approche mécanique et vise à représenter de façon plus précise le comportement de deux particules en contact. Les diffusions au joint de grains, en surface et en volume peuvent être représentées. Pour le moment, seules les diffusions en surface et au joint de grains ont été étudiées. Si certaines optimisations restent nécessaires pour que le code soit fonctionnel, plusieurs aspects apparaissent déjà déterminants, comme la courbure de la surface à proximité du joint de grains. A l’avenir, le modèle Dynamique des Contacts du frittage pourra être complété etamélioré grâce aux éléments apportés par le modèle mécanique à l’échelle du grainThis thesis deals with the simulation of the sintering of nuclear fuel on a pellet scale. The goal is to develop numerical tools which can contribute to a better understandingof the physical phenomena involved in the sintering process. Hence, a multi scale approach is proposed. First of all, a Discrete Element model is introduced. It aims at modeling the motion of particles on a Representative Elementary Volume scale using an original Discrete Element Method. The latter is a Non Smooth Method called Contact Dynamics. Recently, there have been numerous papers about the simulation of sintering using Discrete Element Method. As far as we know, all these papers use smooth methods. Different studies show that the results match well experimental data. However, some limits come from the fact that smooth methods use an explicit scheme which needsvery small time steps. In order to obtain an acceptable time step, the mass of particles have to be dramatically increased. The Non Smooth Contact Dynamics uses an implicit scheme, thus time steps can be much larger without scaling up the mass of particles. The comparison between smooth and non smooth approaches shows thatour method leads to a more realistic representation of rearrangement. An experimental validation using synchrotron X-Ray microtomography is then presented, followedby a parametric study on the sintering of bimodal powders that aims at showing the capacity of this model.The second part presents a mechanical model on the sub-Granular scale, using a Finite Element method. This targets a better understanding of the behavior of twograins in contact. The model is currently being developped but the first results already show that some parameters like the shape of the surface of the neck are very sensitive.In the future, the Non smooth Contact Dynamics model of sintering may be improvedusing the results obtained by the sub-Granular scale mechanical model
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Wales, Michael Dean. "Membrane contact reactors for three-phase catalytic reactions." Diss., Kansas State University, 2015. http://hdl.handle.net/2097/20589.
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Doctor of PhilosophyChemical Engineering
Mary E. Rezac
Membrane contact reactors (MCRs) have been evaluated for the selective hydro-treating of model reactions; the partial hydrogenation of soybean oil (PHSO), and the conversion of lactic acid into commodity chemicals. Membranes were rendered catalytically active by depositing metal catalyst onto the polymer "skin" of an asymmetric membrane. Hydrogen was supplied to the support side of the membrane and permeated from the support side to the skin side, where it adsorbed directly onto the metal surface. Liquid reactant was circulated over the membrane, allowing the liquid to come into direct contact with the metal coated surface of the membrane, where the reaction occurred. Our membrane contact reactor approach replaces traditional three-phase batch slurry reactors. These traditional reactors possess inherent mass transfer limitations due to low hydrogen solubility in liquid and slow diffusion to the catalyst surface. This causes hydrogen starvation at the catalyst surface, resulting in undesirable side reactions and/or extreme operating pressures of 100 atmospheres or more. By using membrane reactors, we were able to rapidly supply hydrogen to the catalyst surface. When the PHSO is performed in a traditional slurry reactor, the aforementioned hydrogen starvation leads to a high amounts of trans-fats. Using a MCR, we were able to reduce trans-fats by over 50% for equal levels of hydrogenation. It was further demonstrated that an increase in temperature had minimal effects on trans-fat formation, while significantly increasing hydrogenation rates; allowing the system to capture higher reaction rates without adversely affecting product quality. Additionally, high temperatures favors the hydrogenation of polyenes over monoenes, leading to low amounts of saturated fats. MCRs were shown to operator at high temperatures and: (1) capture high reaction rates, (2) minimize saturated fats, and (3) minimize trans-fats. We also demonstrated lactic acid conversion into commodity chemicals using MCRs. Our results show that all MCR experiments had faster reaction rate than all of our controls, indicating that MCRs have high levels of hydrogen coverage at the catalyst. It was also demonstrated that changing reaction conditions (pressure and temperature) changed the product selectivities; giving the potential for MCRs to manipulate product selectivity.
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Zhao, Lei. "Dynamics and Statics of Three-Phase Contact Line." Diss., Virginia Tech, 2019. http://hdl.handle.net/10919/102649.
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Wetting, which addresses either spontaneous or forced spreading of liquids on a solid surface, is a ubiquitous phenomenon in nature and can be observed by us on a daily basis, e.g., rain drops falling on a windshield and lubricants protecting our corneas. The study of wetting phenomena can be traced back to the observation of water rising in a capillary tube by Hauksbee in 1706 and still remains as a hot topic, since it lays the foundation for a wide spectrum of applications, such as fluid mechanics, surface chemistry, micro/nanofluidic devices, and phase change heat transfer enhancement. Generally, wetting is governed by the dynamic and static behaviors of the three-phase contact line. Therefore, a deep insight into the dynamics and statics of three-phase contact line at nanoscale is necessary for the technological advancement in nanotechnology and nanoscience. This dissertation aims to understand the dynamic wetting under a molecular kinetic framework and resolve the reconfiguration of liquid molecules at the molecular region of contact line.
Water spreading on polytetrafluoroethylene surfaces is selected as a classical example to study the dynamic behaviors of three-phase contact line. To accommodate the moving contact line paradox, the excess free energy is considered to be dissipated in the form of molecular dissipation. As-formed contact line friction/dissipation coefficient is calculated for water interacting with PTFE surfaces with varying structures and is found to be on the same order of magnitude with dynamic viscosity. From an ab initio perspective, contact line friction is decomposed into contributions from solid-liquid retarding and viscous damping. A mathematical model is established to generalize the overall friction between a droplet and a solid surface, which is able to clarify the static-to-kinetic transition of solid-liquid friction without introducing contact angle hysteresis. Moreover, drag reduction on lotus-leaf-like surface is accounted for as well. For the first time, the concept of contact line friction is used in the rational design of a superhydrophobic condenser surface for continuous dropwise condensation.
We focus on the transport and reconfiguration of liquid molecules confined by a solid wall to shed light on the morphology of the molecular region of a three-phase contact line. A governing equation, which originates from the free energy analysis of a nonuniform monocomponent system, is derived to describe the patterned oscillations of liquid density. By comparing to the Reynolds transport theorem, we find that the oscillatory profiles of interfacial liquids are indeed governed in a combined manner by self-diffusion, surface-induced convection and shifted glass transition. Particularly for interfacial water, the solid confining effects give rise to a bifurcating configuration of hydrogen bonds. Such unique configuration consists of repetitive layer-by-layer water sheets with intra-layer hydrogen bonds and inter-layer defects. Molecular dynamics simulations on the interfacial configuration of water on solid surfaces reveal a quadratic dependence of adhesion on solid-liquid affinity, which bridges the gap between macroscopic interfacial properties and microscopic parameters.Doctor of Philosophy
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Burke, Dave. "The mechanics of the contact phase in trampolining." Thesis, Loughborough University, 2015. https://dspace.lboro.ac.uk/2134/16744.
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During the takeoff for a trampoline skill the trampolinist should produce sufficient vertical velocity and angular momentum to permit the required skill to be completed in the aerial phase without excessive horizontal travel. The aim of this study was to investigate the optimum technique to produce forward somersault rotation. A seven-segment, subject-specific torque-driven computer simulation model of the takeoff in trampolining was developed in conjunction with a model of the reaction forces exerted on the trampolinist by the trampoline suspension system. The ankle, knee, hip, and shoulder joints were torque-driven, with the metatarsal-phalangeal and elbow joints angle-driven. Kinematic data of trampolining performances were obtained using a Vicon motion capture system. Segmental inertia parameters were calculated from anthropometric measurements. Viscoelastic parameters governing the trampoline were determined by matching an angle-driven model to the performance data. The torque-driven model was matched to the performance data by scaling joint torque parameters from the literature, and varying the activation parameters of the torque generators using a simulated annealing algorithm technique. The torque-driven model with the scaled isometric strength was evaluated by matching the performance data. The evaluation produced close agreement between the simulations and the performance, with an average difference of 4.4% across three forward rotating skills. The model was considered able to accurately represent the motion of a trampolinist in contact with a trampoline and was subsequently used to investigate optimal performance. Optimisations for maximum jump height for different somersaulting skills and maximum rotation potential produced increases in jump height of up to 14% and increases of rotation potential up to 15%. The optimised technique for rotation potential showed greater shoulder flexion during the recoil of the trampoline and for jump height showed greater plantar flexion and later and quicker knee extension before takeoff. Future applications of the model can include investigations into the sensitivity of the model to changes in initial conditions, and activation, strength, and trampoline parameters.
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Thiele, Roman. "Modeling of Direct Contact Condensation With OpenFOAM." Thesis, KTH, Reaktorteknologi, 2010. http://urn.kb.se/resolve?urn=urn:nbn:se:kth:diva-49825.
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Within the course of the master thesis project, two thermal phase change models for direct contact conden-sation were developed with different modeling approaches, namely interfacial heat transfer and combustionanalysis approach.After understanding the OpenFOAM framework for two phase flow solvers with phase change capabilities,a new solver, including the two developed models for phase change, was implemented under the name ofinterPhaseChangeCondenseTempFoam and analyzed in a series of 18 tests in order to determine the physicalbehavior and robustness of the developed models. The solvers use a volume-of-fluid (VOF) approach withmixed fluid properties.It has been shown that the approach with inter-facial heat transfer shows physical behavior, a strong timestep robustness and good grid convergence properties. The solver can be used as a basis for more advancedsolvers within the phase change class.
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Walker, Claudio. "Numerical Methods for Two-Phase Flow with Contact Lines." Doctoral thesis, Norges teknisk-naturvitenskapelige universitet, Institutt for energi- og prosessteknikk, 2012. http://urn.kb.se/resolve?urn=urn:nbn:no:ntnu:diva-17462.
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This thesis focuses on numerical methods for two-phase ows, and especially ows with a moving contact line. Moving contact lines occur where the interface between two uids is in contact with a solid wall. At the location where both uids and the wall meet, the common continuum descriptions for uids are not longer valid, since the dynamics around such a contact line are governed by interactions at the molecular level. Therefore the standart numerical continuum models have to be adjusted to handle moving contact lines. In the main part of the thesis a method to manipulate the position and the velocity of a contact line in a two-phase solver, is described. The Navier-Stokes equations are discretised using an explicit nite di erence method on a staggered grid. The position of the interface is tracked with the level set method and the discontinuities at the interface are treated in a sharp manner with the ghost uid method. The contact line is tracked explicitly and its dynamics can be described by an arbitrary function. The key part of the procedure is to enforce a coupling between the contact line and the Navier-Stokes equations as well as the level set method. Results for di erent contact line models are presented and it is demonstrated that they are in agreement with analytical solutions or results reported in the literature. The presented Navier-Stokes solver is applied as a part in a multiscale method to simulate capillary driven ows. A relation between the contact angle and the contact line velocity is computed by a phase eld model resolving the micro scale dynamics in the region around the contact line. The relation of the microscale model is then used to prescribe the dynamics of the contact line in the macro scale solver. This approach allows to exploit the scale separation between the contact line dynamics and the bulk ow. Therefore coarser meshes can be applied for the macro scale ow solver compared to global phase eld simulations, reducing the overall computational coasts. One of the major drawbacks of the level set method is that it does not conserve the mass of the uids. The application of the conservative level set method (CLSM) o ers a solution to this problem. Three of the attached articles address details concerning the implementation of the CLSM using a nite di erence method. A nite di erence discretisation of the CLSM based on stencils used in the Navier-Stokes solver is described and tested. Various methods to compute the curvature in the CLSM are assessed for the use in the ghost uid method. It is shown that the reinitialisation of the CLSM can lead to spurious deformations of the interface, a stabilised constrained reinitialisation is developed in an attempt to prevent the interface from deforming
Книги з теми "Contacted phases"
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Toth, Edwin Alan. Early Marksville phases in the lower Mississippi Valley: A study of culture contact dynamics. Jackson: Mississippi Dept. of Archives and History in cooperation with the Lower Mississippi Survey, Harvard University, 1988.
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Manuwiri, Te. Sketches of early colonisation in New Zealand: And its phases of contact with the Maori race. Christchurch: Whitcombe and Tombs, 1999.
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Lu, Xiao-Xiong. A study of the characteristics of a novel cocurrent downflow bubble column contactor for use as athree-phase reactor. Birmingham: University of Birmingham, 1988.
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Frank, Kreith, and Boehm R. F, eds. Direct-contact heat transfer. Washington: Hemisphere Pub. Corp., 1988.
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Boudreau, J. Donald, Eric J. Cassell, and Abraham Fuks. Phases III and IV—Doctoring. Oxford University Press, 2018. http://dx.doi.org/10.1093/oso/9780199370818.003.0017.
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Phases III and IV of the Physicianship Curriculum focus on clinical knowledge, skills, judgment, and discernment—in short, on “doctoring.” Phase III learning activities occur mainly in clinics, day hospitals, and other outpatient settings; phase IV is in hospitals or other contexts for care of persons with acute illnesses. Students serve as members of health care teams and attending teachers ensure that, whenever possible, instruction involves actual patients encountered by the students. This is designed to provide role models of bedside (and patient-side) behaviors and avoid the depersonalization of paper- (or computer-) based reviews of clinical “cases.” Phase III has four 12-week modules addressing 12 clinical disciplines. Phase IV includes four 6-week modules in mandatory rotations and additional time for electives. Direct patient contact is emphasized, supplemented by case-based teaching, journal clubs, and sessions on imaging and other diagnostic tools. An important goal is to foster critical appraisal.
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Fisher, David. Mechanical Properties of MAX Phases. Materials Research Forum LLC, 2021. http://dx.doi.org/10.21741/9781644901274.
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MAX Phase Materials are uniquely structured carbide and nitride materials which combine the rigidity, oxidation-resistance and high-temperature strength of ceramic materials with such metallic properties as good machinability, thermal-shock resistance, damage-tolerance and good transport properties. Potential applications include microelectronic layers, coatings for electrical contacts, thermal shock-resistant refractories, high-temperature heating elements, neutron-irradiation resistant nuclear applications, thermal barriers, protective aerospace coatings, and bio-compatible materials. The book reviews theoretical and experimental research up to early 2021 and references 185 original resources with their direct web links for in-depth reading.
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Ó Dochartaigh, Niall. Deniable Contact. Oxford University Press, 2021. http://dx.doi.org/10.1093/oso/9780192894762.001.0001.
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Despite the importance of secret negotiations during the Northern Ireland conflict there is no full-length study of the use of back-channels in repeated efforts to end the ‘Troubles’. This book provides a textured account that extends our understanding of the distinctive dynamics of negotiations conducted in secret and the conditions conducive to the negotiated settlement of conflict. It disrupts and challenges some conventional notions about the conflict in Northern Ireland, offering a fresh analysis of the political dynamics and the intra-party struggles that sustained violent conflict and prevented settlement for so long. It draws on theories of negotiation and mediation to understand why efforts to end the conflict through back-channel negotiations repeatedly failed before finally succeeding in the 1990s. It challenges the view that the conflict persisted because of irreconcilable political ideologies and argues that the parties to conflict were much more open to compromise than the often-intransigent public rhetoric suggested. The analysis is founded on a rich store of historical evidence, including the private papers of key Irish republican leaders and British politicians, recently released papers from national archives in Dublin and London, and the papers of Brendan Duddy, the intermediary who acted as the primary contact between the IRA and the British government during key phases of engagement, including papers that have not yet been made publicly available. This documentary evidence, combined with original interviews with politicians, mediators, civil servants, and republicans, allows a vivid picture to emerge of the complex maneuvering at this intersection.
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Saugera, Valérie. Remade in France. Oxford University Press, 2017. http://dx.doi.org/10.1093/acprof:oso/9780190625542.001.0001.
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Remade in France: Anglicisms in the Lexicon and Morphology of French chronicles the current status of French Anglicisms, a hot topic in the history of the French language and a compelling example of the influence of global English. The abundant data come from primary sources—a large online newspaper corpus (for unofficial Anglicisms) and the dictionary (for official Anglicisms)—and secondary sources. This book examines the appearance and behavior of English items in the lexicon and morphology of French, and explains them in the context of French neology and lexical activity. The first phase of the latest contact period (1990–2015) has its own complex linguistic characterization, including a significant influx of nonce borrowings and very low-frequency Anglicisms, heterogeneous and creative borrowing outcomes, and direct phraseological borrowing. This book is a counterargument to the well-known criticism that Anglicisms are lexical polluters. On the contrary, the use of Anglicisms requires the inventive application of complex linguistic rules, and the borrowing of Anglicisms into the French lexicon is convincing proof that language change is systematic. The findings bring novel interdisciplinary insights to the domains of borrowing in a non-bilingual contact setting; global English as a source of lexical creativity in the French lexicon; the phases, patterns and processes of integration of English loanwords; the morphology of borrowing; and computational corpus linguistics. The appended database is a snapshot of a synchronic period of linguistic contact and a useful lexicographic resource.
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Henriksen, Niels Engholm, and Flemming Yssing Hansen. Introduction to Condensed-Phase Dynamics. Oxford University Press, 2018. http://dx.doi.org/10.1093/oso/9780198805014.003.0009.
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This chapter discusses chemical reactions in solution; first, how solvents modify the potential energy surface of the reacting molecules and second, the role of diffusion. As a first approximation, solvent effects are described by models where the solvent is represented by a dielectric continuum, focusing on the Onsager reaction-field model for solvation of polar molecules. The reactants of bimolecular reactions are brought into contact by diffusion, and the interplay between diffusion and chemical reaction that determines the overall reaction rate is described. The solution to Fick’s second law of diffusion, including a term describing bimolecular reaction, is discussed. The limits of diffusion control and activation control, respectively, are identified. It concludes with a stochastic description of diffusion and chemical reaction based on the Fokker–Planck equation, which includes the diffusion of particles interacting via a potential U(r).
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Mann, Peter. Autonomous Geometrical Mechanics. Oxford University Press, 2018. http://dx.doi.org/10.1093/oso/9780198822370.003.0022.
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This chapter examines the structure of the phase space of an integrable system as being constructed from invariant tori using the Arnold–Liouville integrability theorem, and periodic flow and ergodic flow are investigated using action-angle theory. Time-dependent mechanics is formulated by extending the symplectic structure to a contact structure in an extended phase space before it is shown that mechanics has a natural setting on a jet bundle. The chapter then describes phase space of integrable systems and how tori behave when time-dependent dynamics occurs. Adiabatic invariance is discussed, as well as slow and fast Hamiltonian systems, the Hannay angle and counter adiabatic terms. In addition, the chapter discusses foliation, resonant tori, non-resonant tori, contact structures, Pfaffian forms, jet manifolds and Stokes’s theorem.
Частини книг з теми "Contacted phases"
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Pattison, D. R. M., and R. J. Tracy. "Chapter 4. PHASE EQUILIBRIA AND THERMOBAROMETRY OF METAPELITES." In Contact Metamorphism, edited by Derrill M. Kerrick, 105–206. Berlin, Boston: De Gruyter, 1991. http://dx.doi.org/10.1515/9781501509612-007.
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Nikolayev, Vadim S. "Evaporation Effect on the Contact Angle and Contact Line Dynamics." In The Surface Wettability Effect on Phase Change, 133–87. Cham: Springer International Publishing, 2022. http://dx.doi.org/10.1007/978-3-030-82992-6_6.
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Knudsen, James G. "Industrial Practices and Two-Phase Transport." In Direct-Contact Heat Transfer, 61–65. Berlin, Heidelberg: Springer Berlin Heidelberg, 1988. http://dx.doi.org/10.1007/978-3-662-30182-1_4.
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El Abdi, Rochdi, Sofiane El Mossouess, Noureddine Benjemâa, Erwann Carvou, and Laurent Doublet. "Fluctuation of Contact Voltage During Fretting Phases." In Proceedings of the International Conference of Mechatronics and Cyber-MixMechatronics - 2017, 1–10. Cham: Springer International Publishing, 2017. http://dx.doi.org/10.1007/978-3-319-63091-5_1.
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Tracy, R. J., and B. R. Frost. "Chapter 5. PHASE EQUILIBRIA AND THERMOBAROMETRY OF CALCAREOUS, ULTRAMAFIC AND MAFIC ROCKS, AND IRON FORMATIONS." In Contact Metamorphism, edited by Derrill M. Kerrick, 207–90. Berlin, Boston: De Gruyter, 1991. http://dx.doi.org/10.1515/9781501509612-008.
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Deutscher, G. "Point Contact Spectroscopy in the High T c Oxides." In Phase Separation in Cuprate Superconductors, 26–36. Berlin, Heidelberg: Springer Berlin Heidelberg, 1994. http://dx.doi.org/10.1007/978-3-642-78805-5_3.
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Crowe, C. T. "Computational Techniques for Two-Phase Flow and Heat Transfer." In Direct-Contact Heat Transfer, 41–59. Berlin, Heidelberg: Springer Berlin Heidelberg, 1988. http://dx.doi.org/10.1007/978-3-662-30182-1_3.
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Ishikawa, Toshiharu. "Market Analysis Using the Contact Price Curve." In Dynamic Locational Phases of Economic Activity in the Globalized World, 49–53. Singapore: Springer Singapore, 2016. http://dx.doi.org/10.1007/978-981-10-0524-4_3.
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Klein, Abel. "Multiscale Analysis in Disordered Systems: Percolation and contact process in a Random Environment." In Probability and Phase Transition, 139–52. Dordrecht: Springer Netherlands, 1994. http://dx.doi.org/10.1007/978-94-015-8326-8_8.
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Katsumoto, Shingo, Naokatsu Sano, and Shun-ichi Kobayashi. "Phase Velocity Tuning in Quantum Point Contacts." In Science and Technology of Mesoscopic Structures, 81–86. Tokyo: Springer Japan, 1992. http://dx.doi.org/10.1007/978-4-431-66922-7_8.
Повний текст джерелаТези доповідей конференцій з теми "Contacted phases"
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Balbaa, Ola, Sherif Elkholy, Mohamed ElRashidy, Robert Munger, Joost Lasschuit, Bram Masselink, Allan McColl, and Robin Boers. "Introducing New Concepts in Red Zone Management." In Abu Dhabi International Petroleum Exhibition & Conference. SPE, 2021. http://dx.doi.org/10.2118/207436-ms.
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Abstract As red zone management continues to be one of the most challenging risks on different types of drilling rigs, a Combined Operator Contractor Pilot was launched by Helin Data on a Maersk Drilling offshore rig contacted for bp Egypt that was operating in the Mediterranean for 10 years drilling and completing deep water HPHT wells aiming to integrate efficient drilling operations along with maximized safety. The Red Zone Management Pilot system is composed of two main scopes; monitoring and detecting people and equipment on the drill floor using advanced video analytics technology and subsequently developing new technology to include alarmed movement of prime moving/hoisting drill floor equipment. The Helin Data pilot system demonstrates full insight of both personnel and equipment movement in the red zone. In addition, the team looked to further reduce dropped objects related risks using hydraulic wireline winches. This was achieved by installing digital load cells on drill floor tuggers. Remote winch operation with load cells effectively mitigates overpull incidents and associated risks, while involving less persons in the red zone. The pilot project brought simple concepts together with successful results on raising situational awareness on the drill floor and reducing human error, the presentation focuses on the project's functionalities, main challenges and detailed system implementation phases.
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Majeed, Hassaan, Young J. Lee, Catherine Best-Popescu, Gabriel Popescu, Sung-Soo Jang, and Hee Jung Chung. "Non-contact measurement of electrical activity in neurons using magnified image spatial spectrum (MISS) microscopy (Conference Presentation)." In Quantitative Phase Imaging III, edited by Gabriel Popescu and YongKeun Park. SPIE, 2017. http://dx.doi.org/10.1117/12.2256817.
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Xiuping, Su, Lu Jianguo, Gao Bingjun, Liu Guojin, and Li Wenhua. "Determination of the Best Closing Phase Angle for AC Contactor Based on Game Theory." In Electrical Contacts - 2006. 52nd IEEE Holm Conference on Electrical Contacts. IEEE, 2006. http://dx.doi.org/10.1109/holm.2006.284085.
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Huang, Deng, Fang Qian, Wenyao Zhang, Cunlu Zhao, Wenbo Li, and Qiuwang Wang. "An Electromechanical Model for Electrowetting." In ASME 2019 6th International Conference on Micro/Nanoscale Heat and Mass Transfer. American Society of Mechanical Engineers, 2019. http://dx.doi.org/10.1115/mnhmt2019-4130.
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Abstract We present an electromechanical model for analysis of electrowetting by considering the balance between an electric force and a surface tension force acting on the contact line of three phases, namely the droplet (D) phase the substrate (S) phase and the ambiance (A) phase. We show that the electric force acting on the three-phase contact line generally is contributed by the Maxwell stresses at the ambiance-substrate (A-S) interface, the droplet-substrate (D-S) interface, and the droplet-ambiance (D-A) interface. It was identified that the change of contact angle in electrowetting is essentially a consequence of the modification of the electric force on the contact line. For a classical electrowetting configuration, we show that the electric force on the contact line is mainly due to the Maxwell stresses at the D-A interface. Then we examine comprehensively how the electric force on the contact line varies with the permittivity difference between A and S phases, the contact angle and size. It was found that our model agrees excellently with the classical Yong-Lippmann (Y-L) model when the permittivities of A and S phases are equal, while the difference between the two increases as the permittivity difference between A and S phases increases. The electric force increases with the increase of the contact angle for a given droplet size. Our model approaches the Y-L model with the increasing droplet size. The findings are complementary to the classical Y-L model and provide new insights into the electrowetting.
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Peng, William Z., Hyunjong Song, and Joo H. Kim. "Reduced-Order Model With Foot Tipping Allowance for Legged Balancing." In ASME 2021 International Design Engineering Technical Conferences and Computers and Information in Engineering Conference. American Society of Mechanical Engineers, 2021. http://dx.doi.org/10.1115/detc2021-71976.
Повний текст джерелаАнотація:
Abstract Tipping is an instrumental aspect of multi-phase contact situations that arise during common tasks such as the locomotion of legged systems. Despite its importance in balance recovery, tipping is often ignored in trajectory optimization due to the lack of existing methods that are able to actively plan and optimize for unspecified contacts. Trajectory Optimization based on nonlinear programming requires a priori knowledge about anticipated contact changes, such as their order and timing, in order to generate physically feasible motions. In this paper, an optimization framework with conditional constraints is established for direct collocation in trajectory optimization for legged balancing with foot tipping allowance. The proposed approach can evaluate the timing of contact phases without preplanned contact forces or sequences of events, which is not possible with conventional methods. This optimization framework is demonstrated by computing the balanced regions of two reduced-order models of a legged system, namely, inverted-pendulum-based models without and with a flywheel, and is verified with control simulations. The contribution of tipping to balance stability is quantified and compared to prior results obtained without tipping allowance. The framework presented can also be generalized to other multi-phase contact scenarios, such as rolling and sliding, where unspecified discontinuous changes in contact occur with important consequences in the performance of legged systems.
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Braunovic, M., L. Rodrigue, and D. Gagnon. "Nanoindentation Study of Intermetallic Phases in Al-Cu Bimetallic System." In 2008 IEEE Holm Conference on Electrical Contacts (Holm 2008). IEEE, 2008. http://dx.doi.org/10.1109/holm.2008.ecp.55.
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Tong, Jihong, Sosaku Ichikawa, and Shintaro Furusaki. "LYSOZYME EXTRACTION BY AOT REVERSED MICELLAR SYSTEMS USING A ROTATING DISC CONTACTOR --- SIMULATION OF MASS TRANSFER PERFORMANCE." In International Symposium on Liquid-Liquid Two Phase Flow and Transport Phenomena. Connecticut: Begellhouse, 1997. http://dx.doi.org/10.1615/ichmt.1997.intsymliqtwophaseflowtranspphen.220.
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Yoshida, Kiyoshi, and Sunao Tanimoto. "An Experimental Study of Arc Duration and Transition from Metallic to Gaseous Phase in Ag Alloy Break Arc." In Electrical Contacts - 2007 Proceedings of the 53rd IEEE Holm Conference on Electrical Contacts. IEEE, 2007. http://dx.doi.org/10.1109/holm.2007.4318206.
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Kim, Hyun I., and Jeffrey R. Lince. "Conductive Atomic Force Microscopic (C-AFM) Studies of Au/MoS2 Nanocomposite Films." In World Tribology Congress III. ASMEDC, 2005. http://dx.doi.org/10.1115/wtc2005-63987.
Повний текст джерелаАнотація:
Au/MoS2 nanocomposite films with high Au concentrations (75 to 90 at%), recently developed at The Aerospace Corp., have shown properties that are promising for use in sliding electrical contacts, such as slip rings and relays. For such applications, it is critical to maintain low contact resistance while maintaining low friction with controlled wear (i.e. removal and transfer of material). In this report, we present results from conductive atomic force microscopic (c-AFM) investigations of Au/MoS2 nanocomposite structures and their dynamic material transfer phenomena under a sliding contact, which are both important in understanding the friction, wear and conducting mechanisms of the films. We have performed c-AFM to obtain topography, friction and current images simultaneously. Remarkable morphological changes were observed in a series of current images which initially showed distinct nanoscale metallic (Au) and semiconducting (MoS2) phases that were relatively well dispersed, but repeated contact sliding in the same area resulted in gradual disappearance of the metallic phase and reduction of the overall friction. These results reveal that MoS2 is transferred across the surface to provide lubrication while Au particles at or near the surface provide electrical conductivity. The c-AFM results provide real-time and real-space visualization of the lubrication mechanism occurring inside a nanoscale sliding contact.
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Hamon, Arnaud, and Yannick Aoustin. "Walking Trajectory Optimization With Rotation of the Feet for a Planar Bipedal Robot With Four-Bar Knees." In ASME 2012 11th Biennial Conference on Engineering Systems Design and Analysis. American Society of Mechanical Engineers, 2012. http://dx.doi.org/10.1115/esda2012-82580.
Повний текст джерелаАнотація:
The design of a knee joint is a key issue in robotics and biomechanics to improve the compatibility between prosthesis and human movements and to improve the bipedal robot performances. We propose a novel design for the knee joint of a planar bipedal robot, based on a four-bar linkage. The dynamic model of the planar bipedal robot is calculated. We design walking reference trajectories with double support phases, single supports with a flat contact of the foot in the ground and single support phases with rotation of the foot around the toe. During the double support phase, both feet rotate. This phase is ended by an impact on the ground of the toe of one foot, the other foot taking off. The single support phase is ended by an impact of the swing foot heel, the other foot keeping contact with the ground through its toe. For both gaits, the reference trajectories of the rotational joints are prescribed by polynomial functions in time. A parametric optimization problem is presented for the determination of the parameters corresponding to the optimal cyclic walking gaits. The main contribution of this paper is the design of a dynamical stable walking gait with double support phases with feet rotation, impacts and single support phases for this novel bipedal robot.
Звіти організацій з теми "Contacted phases"
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Shiihi, Solomon, U. G. Okafor, Zita Ekeocha, Stephen Robert Byrn, and Kari L. Clase. Improving the Outcome of GMP Inspections by Improving Proficiency of Inspectors through Consistent GMP Trainings. Purdue University, November 2021. http://dx.doi.org/10.5703/1288284317433.
Повний текст джерелаАнотація:
Approximately 90% of the pharmaceutical inspectors in a pharmacy practice regulatory agency in West Africa have not updated their training on Good Manufacturing Practice (GMP) inspection in at least eight years. However, in the last two years the inspectors relied on learning-on-the job skills. During this time, the agency introduced about 17% of its inspectors to hands-on GMP trainings. GMP is the part of quality assurance that ensures the production or manufacture of medicinal products is consistent in order to control the quality standards appropriate for their intended use as required by the specification of the product. Inspection reports on the Agency’s GMP inspection format in-between 2013 to 2019 across the six geopolitical zones in the country were reviewed retrospectively for gap analysis. Sampling was done in two phases. During the first phase sampling of reports was done by random selection, using a stratified sampling method. In the second phase, inspectors from the Regulatory Agency from different regions were contacted on phone to send in four reports each by email. For those that forwarded four reports, two, were selected. However for those who forwarded one or two, all were considered. Also, the Agency’s inspection format/checklist was compared with the World Health Organization (WHO) GMP checklist and the GMP practice observed. The purpose of this study was to evaluate the reporting skills and the ability of inspectors to interpret findings vis-à-vis their proficiency in inspection activities hence the efficiency of the system. Secondly, the study seeks to establish shortfalls or adequacies of the Agency’s checklist with the aim of reviewing and improving in-line with best global practices. It was observed that different inspectors have different styles and methods of writing reports from the same check-list/inspection format, leading to non-conformances. Interpretations of findings were found to be subjective. However, it was also observed that inspection reports from the few inspectors with the hands-on training in the last two year were more coherent. This indicates that pharmaceutical inspectors need to be trained regularly to increase their knowledge and skills in order to be kept on the same pace. It was also observed that there is a slight deviation in placing sub indicators under the GMP components in the Agency’s GMP inspection format, as compared to the WHO checklist.
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Guo, Xiaofang. Generic two-phase coexistence in the quadratic contact process. Office of Scientific and Technical Information (OSTI), January 2009. http://dx.doi.org/10.2172/1342563.
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C.A. Wang, D.A. Shiau, R.K. Huang, C.T. Harris, and M.K. Connors. Organometallic Vapor Phase Epitaxy of n-GaSb and n-GaInAsSb for Low Resistance Ohmic Contacts. Office of Scientific and Technical Information (OSTI), July 2003. http://dx.doi.org/10.2172/821380.
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Birdwell, J. F. Irradiation Effects on Phase-Separation Performance Using a Centrifugal Contactor in a Caustic-Side Solvent Extraction Process. Office of Scientific and Technical Information (OSTI), September 2001. http://dx.doi.org/10.2172/786763.
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Xi, Jianping. Development of optimal SnO{sub 2} contacts for CdTe photovoltaic applications. [Final technical report of Phase II]. Office of Scientific and Technical Information (OSTI), September 1999. http://dx.doi.org/10.2172/770856.
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S.A. Attanasio, D.S. Morton, M.A. Ando, N.F. Panayotou, and C.D. Thompson. Measurement of the Nickel/Nickel Oxide Phase Transition in High Temperature Hydrogenated Water Using the Contact Electric Resistance (CER) Technique. Office of Scientific and Technical Information (OSTI), May 2001. http://dx.doi.org/10.2172/821680.
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Law, Edward, Samuel Gan-Mor, Hazel Wetzstein, and Dan Eisikowitch. Electrostatic Processes Underlying Natural and Mechanized Transfer of Pollen. United States Department of Agriculture, May 1998. http://dx.doi.org/10.32747/1998.7613035.bard.
Повний текст джерелаАнотація:
The project objective was to more fully understand how the motion of pollen grains may be controlled by electrostatic forces, and to develop a reliable mechanized pollination system based upon sound electrostatic and aerodynamic principles. Theoretical and experimental analyses and computer simulation methods which investigated electrostatic aspects of natural pollen transfer by insects found that: a) actively flying honeybees accumulate ~ 23 pC average charge (93 pC max.) which elevates their bodies to ~ 47 V likely by triboelectrification, inducing ~ 10 fC of opposite charge onto nearby pollen grains, and overcoming their typically 0.3-3.9 nN detachment force resulting in non-contact electrostatic pollen transfer across a 5 mm or greater air gap from anther-to-bee, thus providing a theoretical basis for earlier experimental observations and "buzz pollination" events; b) charge-relaxation characteristics measured for flower structural components (viz., 3 ns and 25 ns time constants, respectively, for the stigma-style vs. waxy petal surfaces) ensure them to be electrically appropriate targets for electrodeposition of charged pollen grains but not differing sufficiently to facilitate electrodynamic focusing onto the stigma; c) conventional electrostatic focusing beneficially concentrates pollen-deposition electric fields onto the pistill tip by 3-fold as compared to that onto underlying flower structures; and d) pollen viability is adequately maintained following exposure to particulate charging/management fields exceeding 2 MV/m. Laboratory- and field-scale processes/prototype machines for electrostatic application of pollen were successfully developed to dispense pollen in both a dry-powder phase and in a liquid-carried phase utilizing corona, triboelectric, and induction particulate-charging methods; pollen-charge levels attained (~ 1-10 mC/kg) provide pollen-deposition forces 10-, 77-, and 100-fold greater than gravity, respectively, for such charged pollen grains subjected to a 1 kV/cm electric field. Lab and field evaluations have documented charged vs. ukncharged pollen deposition to be significantly (a = 0.01-0.05) increased by 3.9-5.6 times. Orchard trials showed initial fruit set on branches individually treated with electrostatically applied pollen to typically increase up to ~ 2-fold vs. uncharged pollen applications; however, whole-tree applications have not significantly shown similar levels of benefit and corrective measures continue. Project results thus contribute important basic knowledge and applied electrostatics technology which will provide agriculture with alternative/supplemental mechanized pollination systems as tranditional pollen-transfer vectors are further endangered by natural and man-fade factors.
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Two construction workers electrocuted when crane contacts one phase of a 13.4 kv system in Tennessee, June 26, 1985. U.S. Department of Health and Human Services, Public Health Service, Centers for Disease Control, National Institute for Occupational Safety and Health, July 1985. http://dx.doi.org/10.26616/nioshface8529.
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