Relevant bibliographies by topics / Transference numbers

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  1. Journal articles
  2. Dissertations / Theses
  3. Books
  4. Book chapters
  5. Conference papers
  6. Reports

Academic literature on the topic 'Transference numbers'

Author: Grafiati
Published: 4 June 2021
Last updated: 11 February 2022

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Journal articles on the topic "Transference numbers"

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Darling, Robert M., James D. Saraidaridis, Christopher Shovlin, and Michael Fortin. "Transference Numbers of Vanadium Cations in Nafion." Journal of The Electrochemical Society 167, no. 2 (2020): 020529. http://dx.doi.org/10.1149/1945-7111/ab6b0f.

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Journal, Baghdad Science. "Transference Number Measurement of Zinc Salts in Aqueous Solution." Baghdad Science Journal 7, no. 1 (2010): 593–600. http://dx.doi.org/10.21123/bsj.7.1.593-600.

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Transference numbers of the aqueous zinc chloride and zinc sulphate solutions have been measured for the concentrations 0.03, 0.05, 0.07, 0.09 and 0.1 mol.dm-3at 298.15K, by using the modified Hittorf method. The dependence of transference number on concentration of each electrolyte was also investigated in an attempt to explain the value of the limiting transference number. The Longsworth method has been used for the extrapolation of zinc transference number in aqueous solutions, using the values of the limiting transference numbers of the appropriate values of the limiting equivalent conductance, it was possible to determine the corresponding values of the limiting ion conductance for the cations and anions of the electrolytes. The density and specific conductivity of all solutions have been measured at 298.15K.
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Ratkje, Signe Kjelstrup, Habiba Rajabu, and Tormod Førland. "Transference coefficients and transference numbers in salt mixtures relevant for the aluminium electrolysis." Electrochimica Acta 38, no. 2-3 (1993): 415–23. http://dx.doi.org/10.1016/0013-4686(93)85159-v.

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Castellote, M., C. Andrade, and C. Alonso. "Chloride transference numbers in steady-state migration tests." Magazine of Concrete Research 52, no. 2 (2000): 93–100. http://dx.doi.org/10.1680/macr.2000.52.2.93.

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Frömling, T., M. Kunze, M. Schönhoff, J. Sundermeyer, and B. Roling. "Enhanced Lithium Transference Numbers in Ionic Liquid Electrolytes." Journal of Physical Chemistry B 112, no. 41 (2008): 12985–90. http://dx.doi.org/10.1021/jp804097j.

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Evans, James, Colin A. Vincent, and Peter G. Bruce. "Electrochemical measurement of transference numbers in polymer electrolytes." Polymer 28, no. 13 (1987): 2324–28. http://dx.doi.org/10.1016/0032-3861(87)90394-6.

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Ottøy, Magnar, Tormod Førland, Signe Kjelstrup Ratkje, and Steffen Møller-Holst. "Membrane transference numbers from a new emf method." Journal of Membrane Science 74, no. 1-2 (1992): 1–8. http://dx.doi.org/10.1016/0376-7388(92)87067-8.

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Weing�rtner, Hermann, Bernd M. Braun, and Jutta M. Schmoll. "Determination of transference numbers with ion-selective electrodes. Transference numbers and activity coefficients of concentrated aqueous solutions of potassium fluoride." Journal of Solution Chemistry 16, no. 6 (1987): 419–31. http://dx.doi.org/10.1007/bf00648593.

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Gheribi, Aïmen E., Mathieu Salanne, Didier Zanghi, Kelly Machado, Catherine Bessada, and Patrice Chartrand. "First-Principles Determination of Transference Numbers in Cryolitic Melts." Industrial & Engineering Chemistry Research 59, no. 29 (2020): 13305–14. http://dx.doi.org/10.1021/acs.iecr.0c02281.

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Cohen, Avraham, and Moshe Shoham. "Principle of transference – An extension to hyper-dual numbers." Mechanism and Machine Theory 125 (July 2018): 101–10. http://dx.doi.org/10.1016/j.mechmachtheory.2017.12.007.

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Dissertations / Theses on the topic "Transference numbers"

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Cann, Jaclyn L. "Methodology for determining electronic transference numbers in molten sulfide melts." Thesis, Massachusetts Institute of Technology, 2017. http://hdl.handle.net/1721.1/111225.

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Thesis: S.M., Massachusetts Institute of Technology, Department of Materials Science and Engineering, 2017.<br>This electronic version was submitted by the student author. The certified thesis is available in the Institute Archives and Special Collections.<br>Cataloged from student-submitted PDF version of thesis.<br>Includes bibliographical references (pages 91-93).<br>Electrolysis of molten copper (I) sulfide (Cu2S) in a sulfide-based electrolyte is being investigated for use as a direct path for copper extraction to replace the conventional process of smelting and electrorefining [1]. The allure of an electrolysis process for metals extraction can be enhanced by increasing its faradaic efficiency, through, for example, decreasing the electronic transference number of the electrolyte. This thesis compares two methods of determining the electronic transference number in Cu2S - barium sulfide (BaS) electrolytes to determine whether one or both methods are wellsuited for use with these high-temperature electrolytes. The first method is a stepped potential chronoamperometry method, in which the electronic transference number is determined from the decay of the current after a voltage step. The second method is a faradaic efficiency method, where the ionic transference number is determined from the efficiency with which ions can be transported from one electrode to the other. The stepped potential chronoamperometry method estimates electronic transference numbers between 0.73 and 0.85, while the faradaic efficiency method estimates values between 0.12 and 0.34 for the same electrolyte. Three differences between the experiments are investigated: (1) the work functions of the electrodes used, (2) the additional alloying driving force in faradaic efficiency experiments, and (3) the tin impurities in the electrolyte. This analysis suggests that the difference between the work function of the electrode and the electron affinity of the electrolyte may be the dominant cause of the experimental discrepancy. Therefore, it is suggested that electrodes and electrolytes be chosen to maximize this difference to enhance the faradaic efficiency of copper extraction from Cu2S. The underlying physics of semiconductiviy in molten sulfides, however, remains unclear. Future study of the electronic structure and short range ordering of molten metal sulfides to better understand and predict electronic properties is needed.<br>by Jaclyn L. Cann.<br>S.M.
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Eiamlamai, Priew. "Electrolytes polymères à base de liquides ioniques pour batteries au lithium." Thesis, Université Grenoble Alpes (ComUE), 2015. http://www.theses.fr/2015GRENI016/document.

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De nouvelles familles de liquides ioniques conducteurs par ion lithium; à anions aromatiques et aliphatiques de type perfluorosulfonate perfluorosulfonylimidure attachés à des oligoéthers (méthoxy polyéthylène glycol mPEG) de longueurs différentes ont été synthétisées et caractérisées dans le but d'améliorer l'interaction entre les chaînes de POE et les sels de lithium en améliorant la mobilité segmentaire. Ainsi différentes membranes amorphes ou peu cristallines améliorent le transport cationique par rapport aux électrolytes polymères usuels. . Leurs propriétés ont été évaluées dans deux types de polymères hôtes : un polyéther linéaire (POE) et un polyéther réticulé préparé par un procédé "VERT". Leurs parties oligooxyéthylène aident à la solvatation des cations lithium et conduisent à l'augmentation des propriétés de transport; c'est à dire la conductivité cationique et le nombre de transport. Leurs stabilités thermiques et électrochimiques sont adaptées à l'application batterie lithium-polymère<br>The new families of lithium-conducting ionic liquids; aromatic and aliphatic lithium salts based on perfluorosulfonate and perfluorosulfonylimide anions attached to an oligoether (methoxy polyethylene glycol mPEG) with different lengths were synthesized and characterized with the aim to improve the salt interaction with the host polymer's POE chains while keeping a high segmental mobility. They allowed obtaining membranes with lower crystallization degree and higher cationic transport number as compared with benchmarked salts. Their properties as lithium salts were investigated in two types of host polymers i.e. a linear polyether (POE) and a cross-linked polyether prepared by a ‘GREEN' process. Their oligooxyethylene moieties improve the lithium cation solvation leading to an increase in cationic transference numbers. Their electrochemical and thermal stabilities are suitable for lithium battery application
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Zítka, Jan. "Studium vlastností gelových polymerních elektrolytů pro lithno-iontové akumulátory." Master's thesis, Vysoké učení technické v Brně. Fakulta elektrotechniky a komunikačních technologií, 2013. http://www.nusl.cz/ntk/nusl-220089.

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The present work deals with the research and development of gel polymer electrolytes and their applications. Thesis talks about the mechanisms that take place in gel electro-lytes. It also discusses the electroanalytical methods used in assessing the gel electro-lytes. The main focus of the work is the preparation of gel polymer electrolytes and compared their properties using methods of impedance spectroscopy, cyclic voltam-metry and methods of measurement of transference numbers. KEYWORDS
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Rainwater, Benjamin H. "Electrical properties of BaZr0.1Ce0.7Y0.1Yb0.1O3-δ and its application in intermediate temperature solid oxide fuel cells". Thesis, Georgia Institute of Technology, 2012. http://hdl.handle.net/1853/44828.

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Conventional oxygen anion conducting yttria-stabilized zirconia (YSZ) based solid oxide fuel cells (SOFCs) operate at high temperatures (800oC-1000oC). SOFCs based on proton conducting ceramics, however, can operate at intermediate temperatures (450oC-750oC) due to low activation energy for protonic defect transport when compared to oxygen vacancy transport. Fuel cells that operate at intermediate temperatures ease the critical materials requirements of cell components and reduce system costs, which is necessary for large scale commercialization. BaCeO3-based perovskite materials are candidates for use as ion conductors in intermediate temperature SOFCs (IT-SOFCs) when doped with trivalent cations in the B-site. B-site doping forms oxygen vacancies which greatly increases the electrical conductivity of the material. The oxygen vacancies are consumed during the creation of protonic defects or electronic defects, depending on the atmosphere and temperature range. High performance IT-SOFCs based on the Y3+ and Yb3+ doped BaCeO3-based system, BaZr0.1Ce0.7Y0.1Yb0.1O3-δ (BZCYYb) have been recently reported. High conductivity in O2/H2O atmosphere was reported, however, a more basic understanding of the BZCYYb structure, electrical conductivity, and the portion of the charge carried by each charge carrier under fuel cell conditions is lacking. In this work, the BZCYYb material is fabricated by the solid state reaction method and the crystal structure at intermediate temperatures is studied using HT-XRD. The total conductivity of BZCYYb in H2/H2O, O2/H2O, and air atmospheres in the IT-SOFC temperature range is reported. The activation energy for transport at these conditions is determined from the conductivity data and the transference numbers of protonic defects, oxygen anion defects and electronic defects in the BZCYYb material are determined by the concentration cell - OCV method. BZCYYb is a mixed proton, oxygen anion, and electronic conductor at IT-SOFC temperature ranges (450oC - 750oC), in H2, O2, and H2O containing atmospheres. Ni-BZCYYb/BZCYYb/BZCYYb-LSCF fuel cells were constructed and peak power densities of ~1.2 W/cm2 were reported at 750oC after optimization of the Ni-BZCYYb anode porosity. Decreasing the Ni-BZCYYb anode porosity did not significantly affect the electrical conductivity of the anode, however the peak power densities of the IT-SOFCs based on the anode with less porosity, calculated from I-V curve data, showed dramatic improvement. The fuel cell with the lowest anode porosity demonstrated the highest performance. This finding is in stark contrast to the optimal anode porosity needed for high performance in YSZ-based, oxygen anion conducting SOFCs. Because of significant proton conduction in the BZCYYb material, fuel cell reaction products (water) form at the cathode side and less porosity is required on the anode side. The improvement in performance in the BZCYYb based IT-SOFC is attributed to the unique microstructure formed in the Ni-BZCYYb anode when no pore forming additives are used which may contribute to high electrocatalytic behavior for anode reactions. This work provides a basic understanding of the electrical properties of BZCYYb and clarifies the feasibility of using BZCYYb in each component of the IT-SOFC system as well as in other electrochemical devices. The high performance of the Ni-BZCYYb/BZCYYb/BZCYYb-LSCF IT-SOFC, due to low anode porosity, provides a new understanding for the rational development of high performance IT-SOFCs based on electrolytes with significant protonic conduction.
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Marroni, Neto Roberto Medaglia. "Igualdade tributária e margens de lucro presumidas na aferição do preço de transferência segundo a Lei n. 9.430/96." reponame:Biblioteca Digital de Teses e Dissertações da UFRGS, 2011. http://hdl.handle.net/10183/134378.

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O presente trabalho tem por objetivo analisar a teoria da igualdade tributária e sua aplicação em face da técnica das margens de lucro presumidas, como um dos elementos de cálculo dos preços de transferência, consoante previsto na Lei n. 9.430/96. Parte-se de um estudo analítico da isonomia tributária, esmiuçando-se seus elementos, natureza e dimensão normativa, para, posteriormente, passar-se à análise de sua influência sobre a arm’s legth theory e a técnica dos preços de transferência, em especial sobre a presunção das margens de lucro. Mediante esta perspectiva, busca-se averiguar a possibilidade ou não de flexibilização daquelas margens de lucratividade, de molde a desvendar se o contribuinte possui legitimidade de utilizar margens de lucro diversas daquelas predefinidas, a forma que poderá valer-se deste direito e respectivo momento.<br>This work aims to analyze the tax equality theory and its application in the face of the presumed profit margins technique, as one of the elements of the calculation of transfer pricing, according to law number 9.430/96. It starts with an analytical study of tax equality theory, scrutinizing its elements, nature and normative dimension, and subsequently moves to an analysis of its influence on the „arm‟s length‟ principle and the technique of transfer pricing, especially on the presumption of profit margins. With this perspective, it seeks to investigate the possibility of the relaxation of those profit margins, which could unravel if the taxpayer has the right to use different profit margins than those pre-defined, however the taxpayer can avail themselves of this right and when is the appropriate moment.
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Chamaani, Amir. "Hybrid Polymer Electrolyte for Lithium-Oxygen Battery Application." FIU Digital Commons, 2017. https://digitalcommons.fiu.edu/etd/3562.

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The transition from fossil fuels to renewable resources has created more demand for energy storage devices. Lithium-oxygen (Li-O2) batteries have attracted much attention due to their high theoretical energy densities. They, however, are still in their infancy and several fundamental challenges remain to be addressed. Advanced analytical techniques have revealed that all components of a Li-O2 battery undergo undesirable degradation during discharge/charge cycling, contributing to reduced cyclability. Despite many attempts to minimize the anode and cathode degradation, the electrolyte remains as the leading cause for rapid capacity fading and poor cyclability in Li-O2 batteries. In this dissertation, composite gel polymer electrolytes (cGPEs) consisting of a UV-curable polymer, tetragylme based electrolyte, and glass microfibers with a diameter of ~1 µm and an aspect ratio of >100 have been developed for their use in Li-O2 battery application. The Li-O2 batteries containing cGPEs showed superior charge/discharge cycling for 500 mAh.g-1 cycle capacity with as high as 400% increase in cycles for cGPE over gel polymer electrolytes (GPEs). Results using in-situ electrochemical impedance spectroscopy (EIS), Raman spectroscopy, and scanning electron microscopy revealed that the source of the improvement was the reduction of the rate of lithium carbonates formation on the surface of the cathode. This decrease in formation rate afforded by cGPE-containing batteries was possible due to the decrease of the rate of electrolyte decomposition. The increase in solvated to the paired Li+ ratio at the cathode, afforded by increased lithium transference number, helped lessen the probability of superoxide radicals reacting with the tetraglyme solvent. This stabilization during cycling helped prolong the cycling life of the batteries. The effect of ion complexes on the stability of liquid glyme based electrolytes with various lithium salt concentrations has also been investigated for Li-O2 batteries. Charge/discharge cycling with a cycle capacity of 500 mAh·g-1 showed an improvement as high as 300% for electrolytes containing higher lithium salt concentrations. Analysis of the Raman spectroscopy data of the electrolytes suggested that the increase in lithium salt concentration afforded the formation of cation-solvent complexes, which in turn, mitigated the tetragylme degradation.
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Plumridge, Jeffrey. "Deuterium Isotope Effects on the Limiting Molar Conductivities of Strong Aqueous Electrolytes from 25 °C to 325 °C at 20 MPa." Thesis, 2013. http://hdl.handle.net/10214/7736.

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State of the art conductivity equipment has been used to measure deuterium isotope effects on the molar conductivity of strong electrolytes in the temperature range of 298 K to 598 K as a means of exploring solvation effects under hydrothermal conditions. Individual ionic contributions were determined by extrapolation of published transference number data to elevated temperature. The temperature dependence of the Walden product ratio indicates that there is little difference in the transport of ions between light and heavy water . Excess conductivity observed in hydrogen and deuterium compounds arising from proton hopping in hydrogen-bonded networks has been determined in the temperature range of 318 K to 598 K for the first time
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Books on the topic "Transference numbers"

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Barthel, Josef. Electrolyte Data Collection: Conductivities, Transference Numbers, and Limiting Ionic... Scholium Intl, 2003.

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Electrolyte Data Collection: Conductivities, Transference Numbers, and Limiting Lonic Conductivities of Ethanol (Chemistry Data Series, Vol. XII, Part 1a). Dechema, 1993.

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Barthel, Josef, R. Neueder, and P. Schroder. Electrolyte Data Collection: Conductivities, Transference Numbers, and Limiting Lonic Conductivities of Solutions of Aprotic, Protophobic Solvents (Chemistry Data Series, V. 12.). Dechema, 1996.

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(Editor), Josef Barthel, and R. Neueder (Editor), eds. Electrolyte Data Collection: Conductivities, Transference Numbers, & Limiting Ionic Conductivities of Solutions of Aprotic, Protophobic Solvents III & IV (Dechema Chemistry Data Series). Dechema, 2000.

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Heffernan, Timothy F. The measurement of ionic conductivity and transference numbers in mixed conducting metal oxides: An analysis of the In₂O₃ - PrO₂ - ZrO₂ ceramic system. 1986.

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Barthel, Josef, R. Neueder, and P. Schroder. Electrolyte Data Collection: Conductivities, Transference Numbers, and Limiting Lonic Conductivities of Solutions of Propanol, Butanol, and Higher Alcohols (Chemistry Data Series, V. 12.). Dechema, 1994.

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McFarlane, Ben, Nicholas Hopkins, and Sarah Nield. 11. Trusts. Oxford University Press, 2015. http://dx.doi.org/10.1093/he/9780198722847.003.0011.

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All books in this flagship series contain carefully selected substantial extracts from key cases, legislation, and academic debate, providing able students with a stand-alone resource. This chapter describes how equitable interests in land are acquired by the creation of a trust. It addresses the acquisition of resulting and constructive trusts of land. The resulting trust arises either through a reluctance to assume that A intended a gift, or to prevent B's unjust enrichment at A's expense. Constructive trusts arise in a number of circumstances in which it is considered unconscionable for the legal owner to assert his or her own beneficial ownership, and to deny the beneficial interest of another. They arise under the doctrine Rochefoucauld v Boustead, and the Pallant v Morgan equity. The doctrine in Rochefoucauld v Boustead imposes a constructive trust to prevent a transferee of land from fraudulently relying on the absence of compliance with formalities to deny a trust pursuant to which the land was transferred. The Pallant v Morgan constructive trust arises where one party acquires land pursuant to an informal commercial joint venture and reneges on an agreement that another party will have an interest in the land. The trust has been categorized as a form of ‘common intention constructive trust’ but this categorization is contentious.
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Book chapters on the topic "Transference numbers"

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Zugmann, Sandra, and Heiner Jakob Gores. "Transference Numbers of Ions in Electrolytes." In Encyclopedia of Applied Electrochemistry. Springer New York, 2014. http://dx.doi.org/10.1007/978-1-4419-6996-5_501.

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Híveš, J., P. Fellner, and J. Thonstad. "Transference Numbers in Na(K) Cryolite-Based Systems." In Molten Salts Chemistry and Technology. John Wiley & Sons, Ltd, 2014. http://dx.doi.org/10.1002/9781118448847.ch1j.

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Cai, Jin-Yi. "A New Transference Theorem in the Geometry of Numbers." In Lecture Notes in Computer Science. Springer Berlin Heidelberg, 1999. http://dx.doi.org/10.1007/3-540-48686-0_11.

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Holze, Rudolf. "Transference numbers of Ag+ ion in aqueous electrolyte solutions." In Electrochemistry. Springer Berlin Heidelberg, 2016. http://dx.doi.org/10.1007/978-3-662-49251-2_1592.

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Holze, Rudolf. "Transference numbers of Ba2+ ion in aqueous electrolyte solutions." In Electrochemistry. Springer Berlin Heidelberg, 2016. http://dx.doi.org/10.1007/978-3-662-49251-2_1593.

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Holze, Rudolf. "Transference numbers of Br− ion in aqueous electrolyte solutions." In Electrochemistry. Springer Berlin Heidelberg, 2016. http://dx.doi.org/10.1007/978-3-662-49251-2_1594.

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Holze, Rudolf. "Transference numbers of acetate ion in aqueous electrolyte solutions." In Electrochemistry. Springer Berlin Heidelberg, 2016. http://dx.doi.org/10.1007/978-3-662-49251-2_1596.

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Holze, Rudolf. "Transference numbers of oxalate ion in aqueous electrolyte solutions." In Electrochemistry. Springer Berlin Heidelberg, 2016. http://dx.doi.org/10.1007/978-3-662-49251-2_1598.

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Holze, Rudolf. "Transference numbers of benzoate ion in aqueous electrolyte solutions." In Electrochemistry. Springer Berlin Heidelberg, 2016. http://dx.doi.org/10.1007/978-3-662-49251-2_1600.

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Holze, Rudolf. "Transference numbers of salicylate ion in aqueous electrolyte solutions." In Electrochemistry. Springer Berlin Heidelberg, 2016. http://dx.doi.org/10.1007/978-3-662-49251-2_1601.

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Conference papers on the topic "Transference numbers"

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Brodsky, Vladimir, and Moshe Shoham. "Explicit Algorithm for Robot Manipulator Dual Dynamics." In ASME 1997 Design Engineering Technical Conferences. American Society of Mechanical Engineers, 1997. http://dx.doi.org/10.1115/detc97/dac-4316.

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Abstract Kinematicians have used dual numbers to obtain rigid body kinematics in a compact three-dimensional form by substituting dual for real numbers in the equation of rotational motion. No such simple relation, known as ‘principle of transference’, existed however, for dynamics. The commonly used inertia binor by which dual momentum is calculated, raises the dual dynamic equations to six dimensions. In fact, the inertia binor does not act on the dual vector as a whole, but rather on its real and dual parts as two distinct real vectors. The recently introduced dual mass operator can serve as the missing link between the dual kinematic and the dual dynamic equations. It gives the mass a dual property which has a complementary sense of Clifford’s dual unit, namely, it reduces a motor to a rotor proportional to the vector part of the motor. With this definition of mass, the same equation of momentum and its time derivative, which holds for a linear motion, holds for both linear and angular motion of a rigid body if dual force, dual velocity, and dual inertia replace their real counterparts. Application of the dual inertia operator and motor transformation rule permits derivation of an explicit dynamic algorithm of a serial manipulator which has several advantages over the more conventional Newton-Euler and Lagrange formulations. Firstly, all the expressions of this algorithm are explicit parts of the dual transformation matrices and the constant link-attached inertia parameters. Secondly, this algorithm is an explicit, not a recursive one and does not require derivative of any one of its terms. It rather gives all coefficients of the dynamic equations in a simple and compact form of determinants and vector scalar product.
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McColl, Chance C., and Massimo Ruzzene. "Analysis of Rotor Load Harmonic Composition and Load Transference Between Frames." In ASME 2013 International Design Engineering Technical Conferences and Computers and Information in Engineering Conference. American Society of Mechanical Engineers, 2013. http://dx.doi.org/10.1115/detc2013-12323.

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Loads prediction for helicopters is more complex than that for fixed wing aircraft given that the aerodynamic forces that produce the air vehicle’s lift and moments are generated by rotating components (e.g., the main and tail rotors). This paper examines rotor load content as a function of harmonics of the rotor angular speed. Accurate rotor loads prediction is driven by a clear understanding of the underlying physics of the problem. This understanding is important for several reasons. First, additive effects of multiple load components fed from the rotating frame to the fixed frame influence the vibratory response of the hub and fuselage. Second, structural fatigue life is driven by load magnitude as well as the number of applications of each load. The mechanics of load transference between the rotating and fixed frames will also be examined. Examples for 4-bladed and 7-bladed rotors will be presented. Definitions of cyclic/whirl (moment transference), collective (force transference), and reactionless/warp (zero force, zero moment transference) modes will be presented for a generic n-bladed rotor. US Army UH-60A Black Hawk flight test data will be examined. Blade lift, main rotor shaft bending, pushrod axial load, and fixed system servo loads will be derived and compared with measured UH-60A results. The intent of this paper is to provide clear insight into the nature of rotor load harmonic composition and load transference between the fixed and rotating frames for a rotor — two areas not well documented (and never visually described) in the literature.
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Drago, James, and Wayne Evans. "Gauging the Force Effects of Valve Stem Packing on Valve Stem Actuation." In ASME/NRC 2017 13th Pump and Valve Symposium. American Society of Mechanical Engineers, 2017. http://dx.doi.org/10.1115/pvs2017-3518.

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Stem friction in an operating valve is a function of the dynamic interaction of a number of variables — packing material of construction, number of packing rings, compressive load, lubrication, stem surface finish, temperature, cycling, etc. Forces due to friction can be reduced by modifying these factors. Attaining low actuation force and good sealing requires a balanced approach. Packing manufacturers have their own procedures for determining the frictional properties of different packing materials. This paper will show one such procedure and how varying materials and packing set configurations affect actuation force. The focus will be on linear reciprocating valve stems. The equation F = π × d × H × GS × μ × Y can be used to calculate the force of the packing on the valve stem: Where F - Force needed to overcome packing friction; d - Stem diameter; H - Packing set height; GS - Compressive stress on the packing; μ - Packing coefficient of friction; Y - Ratio of radial to axial load transference, commonly equal to 0.50. Knowing the force, F, by test allows the calculation of the packing set’s frictional characteristics. . This knowledge can guide valve designers and builders to properly size actuating units for consistent and reliable valve performance. Paper published with permission.
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de Menezes, Fabio Gouveia Telles, Breno Pinheiro Jacob, Carl Horst Albrecht, and Fabrício Nogueira Corrêa. "Application of Parametric Surfaces in Contact Assessment Between Two Floaters in Side by Side Operations." In ASME 2012 31st International Conference on Ocean, Offshore and Arctic Engineering. American Society of Mechanical Engineers, 2012. http://dx.doi.org/10.1115/omae2012-84233.

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In front of the growing demand for natural gas, alternative solutions have been adopted to export the production to the several available markets. Conventional gas carriers have been converted to regasification units to operate close to the shore, treating the gas and delivering it to carriers which take the product to the shore. Side by side configurations for the gas transference by loading arms are common, and the reduce distance between the ships is the main challenge. For such application a time domain simulation is demanded. Due to the close proximity between the ships, at each time step, their distance has to be calculated in order to predict eventual ship to ship or ship to fenders collisions. When the ships are modeled by conventional meshes the interference analysis every time step is excessively time consuming, the use of parametric surfaces reduces the number of elements to be checked against each other and saves computational cost. The precision is also improved since the hull shapes are fully represented in comparison to the panel approximation provided by the meshing approach. The contact verification plays a fundamental role for that type of analysis and the gains obtained by the parametric surfaces appliance are significant.
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Bellon, J. L., J. D. Szefner, C. Castellanos, et al. "COAGULATION CONTROL MADE IN FIFTEEN RECIPIENTS OF JARVIK 7 ARTIFICIAL HEART. AN STATISTICAL STUDY." In XIth International Congress on Thrombosis and Haemostasis. Schattauer GmbH, 1987. http://dx.doi.org/10.1055/s-0038-1643095.

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From April to December of 1986 fifteen Jarvik-7 artifi cial heart were temporally implanted until definitive-heart transplantation in 12 men and 3 women of 18 to 55 years old.Jarvik's stay ranged between 48 hours to 20 days, The coagulation control applied was:PT,APTT, reptilase,fibrinogen,platelet aggregation by turbidi-metry to ADP,epinephrine,collagen and arachidonic acid thromboelastography in whole blood,plasma and serum antithrombin III and activated factor X by specific substrates,haematocrit, platelet count,platelet factor 4 and B-thromboglobulin by enzymeimmunoassays,fibrin/ fibrinogen degradation products,alfa-2-antiplasmin, fibrinopeptide A and Raby’s transference test.Number of controls for each patient were 1 to 3 daily.Measure ments were done in preoperative,immediate postoperative and maxim bleeding period.The most significant data were compiled in tables as number of cases, x ± S.E. and S.D.x.Statistical methods were correlation coeffic ient, Pares “t”and Newman-Keuls for p &lt;0.05. It is concluded that the most critical period was the immediate postoperative and because of the treatments applied in the maxim bleeding period, it was possible to reach the patient’s healtn recuperation whenever either a se vere organic failure or sepsis did not appear.Treatments mainly applied were heparin,dipyridamol,aproti-nin and antithrombin III concentrates, dose being adag ted to the results obtained in controls.Jarvik’s status observations when explanted will be presented in a paper aside.No patient suffered any cerebral,vascular or thromboembolic event.
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Moura, Carlos H. W., Dirceu S. Sampaio, Igor M. de Lacerda, and Marcelo F. Selli. "Monitoring Leakages on Oil Production Offloading at Open Seas Using Statistics Associated With Mass Balance Methods." In 2004 International Pipeline Conference. ASMEDC, 2004. http://dx.doi.org/10.1115/ipc2004-0763.

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With the increasing number of former VLCC (Very Large Crude Cargos) transformed into FPSOs worldwide, and its associated inherent oil production exportation characteristics to shuttle tankers, where very large flow rates are combined to the use of short and large diameters exporting lines, in many cases involving the use of hoses instead of flexible pipelines, and the obviously very sensitive environment, considering the execution of this transference in open seas, where losses for even a small period, regarded the involved exportation capacity means a huge spillage, with all its legal and image associated impacts, the challenge to identify and test technologies able to carry out the most effective leakage detection in this scenario was placed to PETROBRAS technical team, as consequence of rules demanding the installation of such systems stated by Brazilian Environmental Agencies. The proposal of this paper is to show the leakage detection solution based on a hybrid method combining mass balance along with statistical treatment adopted for monitoring the oil production offloading from the FPSO - MARLIM SUL, in the Campos Basin, Brazil, to a dynamically positioned shuttle vessel throughout a 150 meters, 20” diameter hose designed for a flow rate of 8.000 m3 per hour. A short description of this production system is provided, the operational principles of the adopted leakage system are depicted, its architecture is detailed, and the reasons that ended up leading PETROBRAS to adopt this technology amongst those others also considered are presented. Finally, comments about the installation, start-up and tuning, and considerations about the system observed behavior are made.
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Reports on the topic "Transference numbers"

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Dai, H., S. Sanderson, J. Davey, F. Uribe, and T. A. Jr Zawodzinski. Electrophoretic NMR measurements of lithium transference numbers in polymer gel electrolytes. Office of Scientific and Technical Information (OSTI), 1997. http://dx.doi.org/10.2172/474865.

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Prysyazhnyi, Mykhaylo. UNIQUE, BUT UNCOMPLETED PROJECTS (FROM HISTORY OF THE UKRAINIAN EMIGRANT PRESS). Ivan Franko National University of Lviv, 2021. http://dx.doi.org/10.30970/vjo.2021.50.11093.

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In the article investigational three magazines which went out after Second World war in Germany and Austria in the environment of the Ukrainian emigrants, is «Theater» (edition of association of artists of the Ukrainian stage), «Student flag» (a magazine of the Ukrainian academic young people is in Austria), «Young friends» (a plastoviy magazine is for senior children and youth). The thematic structure of magazines, which is inferior the association of different on age, is considered, by vital experience and professional orientation of people in the conditions of the forced emigration, paid regard to graphic registration of magazines, which, without regard to absence of the proper publisher-polydiene bases, marked structuralness and expressiveness. A repertoire of periodicals of Ukrainian migration is in the American, English and French areas of occupation of Germany and Austria after Second world war, which consists of 200 names, strikes the tipologichnoy vseokhopnistyu and testifies to the high intellectual level of the moved persons, desire of yaknaynovishe, to realize the considerable potential in new terms with hope on transference of the purchased experience to Ukraine. On ruins of Europe for two-three years the network of the press, which could be proud of the European state is separately taken, is created. Different was a period of their appearance: from odnogo-dvokh there are to a few hundred numbers, that it is related to intensive migration of Ukrainians to the USA, Canada, countries of South America, Australia. But indisputable is a fact of forming of conceptions of newspapers and magazines, which it follows to study, doslidzhuvati and adjust them to present Ukrainian realities. Here not superfluous will be an example of a few editions on the thematic range of which the names – «Plastun» specify, «Skob», «Mali druzi», «Sonechko», «Yunackiy shliah», «Iyzhak», «Lys Mykyta» (satire, humour), «Literaturna gazeta», «Ukraina і svit», «Ridne slovo», «Hrystyianskyi shliah», «Golos derzhavnyka», «Ukrainskyi samostiynyk», «Gart», «Zmag» (sport), «Litopys politviaznia», «Ukrains’ka shkola», «Torgivlia i promysel», «Gospodars’ko-kooperatyvne zhyttia», «Ukrainskyi gospodar», «Ukrainskyi esperantist», «Radiotehnik», «Politviazen’», «Ukrainskyi selianyn» Considering three riznovektorni magazines «Teatr» (edition of Association Mistciv the Ukrainian Stage), «Studentskyi prapor» (a magazine of the Ukrainian academic young people is in Austria), «Yuni druzi» (a plastoviy magazine is for senior children and youth) assert that maintenance all three magazines directed on creation of different on age and by the professional orientation of national associations for achievement of the unique purpose – cherishing and maintainance of environments of ukrainstva, identity, in the conditions of strange land. Without regard to unfavorable publisher-polydiene possibilities, absence of financial support and proper encouragement, release, followed the intensive necessity of concentration of efforts for achievement of primary purpose – receipt and re-erecting of the Ukrainian State.
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