Relevant bibliographies by topics / Barrier of rotation

Contents

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

Academic literature on the topic 'Barrier of rotation'

Author: Grafiati
Published: 5 June 2025
Last updated: 1 August 2025

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Journal articles on the topic "Barrier of rotation"

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GANGAMANI, H. V., ACHALA L. NARGUND, and M. VENKATACHALAPPA. "An Analysis of Internal Gravity Wave Tunnelling in a Stratified Region Along with Rotation." JOURNAL OF ADVANCES IN PHYSICS 10, no. 2 (2015): 2741–52. http://dx.doi.org/10.24297/jap.v10i2.1332.

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The internal gravity wave tunnelling in presence of earth’s rotation is studiedfor different density barriers. An exponential approximation used revealsthe existence of evanescence in the barrier region which signifies the trappingof wave energy in the tunnelling region. The Transmission coefficients arecomputed for different density barriers and the comparative study shows thatacross the locally mixed region the transmission is enhanced. The asymptoticanalysis of the transmission co-efficient using the rotational parameter revealsthe convergence and the graphs shows that the transmission de
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Radchenko, Pavel A., Andrey V. Radchenko, and Stanislav P. Batuev. "A numerical study of the high-velocity interaction of rotating strikers having different head shapes with a barrier of finite thickness." Vestnik Tomskogo gosudarstvennogo universiteta. Matematika i mekhanika, no. 87 (2024): 120–34. http://dx.doi.org/10.17223/19988621/87/10.

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Numerical simulation methods are used to study the effect of rotation of cylindrical strikers made of high-strength steel on the high-velocity interaction with a steel barrier. Three types of striker head shapes are considered: ogival, hemispherical, and flat. The initial velocity of the striker is 1000 m/s, and the rotation frequency varies from 0 to 10000 revolutions per second. The striker-barrier interaction angle varies from 0° to 75°. The modeling is carried out in a three-dimensional formulation using the author’s EFES 2.0 software package. This allows the simulation of the fragmentatio
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LI, GUOPING, WEIREN XU, CHAOJUN ZHANG, JIANWU WANG, and CHENGBU LIU. "THEORETICAL STUDY ON THE INTERNAL ROTATION OF NITROTYL OF BENZALDOXIMES." Journal of Theoretical and Computational Chemistry 05, no. 01 (2006): 111–20. http://dx.doi.org/10.1142/s0219633606002088.

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The internal rotations of nitrotyl around the bond C–C in Z- and E-benzaldoximes and their various substituted species have been investigated theoretically by the method of density functional theory (DFT) at the B3LYP/6-31G* level. The corresponding rotation transition states have been optimized. The potential barriers and the rates of the internal rotations of various species have been calculated. The rotation barrier of Z-benzaldoxime is lower than that of E-isomer. The para-substitution has only a small influence on the rotation barriers. The conjugations are consolidated in the acidic and
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Brownstein, S., and J. Roovers. "Calculation of barriers to rotation in PEEK and some of its substituted derivatives." Canadian Journal of Chemistry 75, no. 9 (1997): 1225–28. http://dx.doi.org/10.1139/v97-147.

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Barriers to rotation have been calculated by molecular mechanics, using the force field MM+, for a fragment of PEEK and its methyl, ethyl, isopropyl, tert-butyl and di-tert-butyl, substituted derivatives. The barrier for the nearer C—O bond increases from 2.0 kcal/mol in KEEK to 16 kcal/mol in dibutyl substituted KEEK as the bulkiness of the substituent increases. The rotation barrier of the further C—O bond is not affected by the substituent. Keywords: rotation barriers, PEEK, molecular mechanics.
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Craik, DJ, PR Andrews, C. Border, and SLA Munro. "Conformational Studies of Thyroid Hormones. I. The Diphenyl Ether Moiety." Australian Journal of Chemistry 43, no. 5 (1990): 923. http://dx.doi.org/10.1071/ch9900923.

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Conformational flexibility round the diphenyl ether linkage in the thyroid hormones has been investigated by means of molecular orbital (AM1) and classical potential-energy calculations. The results obtained from these theoretical approaches are in qualitative agreement with those from n.m.r. spectroscopy, i.e., the barrier to rotation around this structural feature is sufficiently low to allow rapid interconversion between two stable conformers to occur at room temperature. Two pathways of rotation around the diphenyl ether bridge were explored and were both calculated to be approximately 14-
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Nair, K. P. Rajappan, Sven Herbers, Daniel A. Obenchain, and Jens-Uwe Grabow. "Internal methyl rotation and molecular structure of trifluorotoluenes: microwave rotational spectra of 2,3,4- and 2,4,5-trifluorotoluene." Canadian Journal of Physics 98, no. 6 (2020): 543–50. http://dx.doi.org/10.1139/cjp-2019-0477.

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The microwave rotational spectra of 2,3,4- and 2,4,5-trifluorotoluenes, along with all 13C isotopic species in natural abundance, have been recorded in the frequency range 8–27 GHz employing pulsed-jet Fourier transform microwave spectroscopy. The analysis of the spectra in the lowest torsional state has yielded the rotational constants, centrifugal distortion constants, three-fold barrier to methyl rotation, and the direction of the internal rotation axis in the moment of inertia principal axes systems of these trifluorotoluenes. For both molecules, the molecular constants of their eight isot
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Baerends, Evert Jan, F. Matthias Bickelhaupt, and Peter Schreiner. "The rotation barrier in ethane." Nachrichten aus der Chemie 52, no. 5 (2004): 581. http://dx.doi.org/10.1002/nadc.20040520519.

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Khemissi, Safa, Lynn Ferres, and Ha Vinh Lam Nguyen. "Two Coupled Low-Barrier Large Amplitude Motions in 3,5-Dimethylanisole Studied by Microwave Spectroscopy." Molecules 30, no. 6 (2025): 1195. https://doi.org/10.3390/molecules30061195.

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The microwave spectrum of 3,5-dimethylanisole was recorded using a pulsed molecular jet Fourier transform microwave spectrometer, covering the frequency range from 2.0 to 26.5 GHz. Splittings from internal rotations of the syn-m and anti-m-methyl groups were observed, analyzed, and modeled using the XIAM and the ntop programs for a data set including 622 rotational lines. The torsional barriers of the syn-m and anti-m-methyl groups were determined to be 58.62367(53) cm−1 and 36.28449(69) cm−1, respectively. The low barriers to internal rotation of both methyl groups posed significant challenge
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Randeil, Jeremy, A. Peter Cox, and H. Dreizier. "Gauche Propanal: Microwave Spectrum and Methyl Barrier." Zeitschrift für Naturforschung A 42, no. 9 (1987): 957–62. http://dx.doi.org/10.1515/zna-1987-0908.

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The barrier hindering internal rotation of the methyl group was determined by analysing ground-state A, E splittings of rotational lines in the 0+ and 0- torsional states of gauche propanal. The value V3 = 886 (10)cm-1 obtained can be compared with that obtained earlier for the cis rotamer.The A rotational constant has also been determined, its value averaged over the two lowest states being 26248.41 (5) MHz.
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ALONSO, JOSE, ALBERTO LESARRI, JUAN LOPEZ, SUSANA BLANCO, ISABELLE KLEINER, and JEAN DEMAISON. "Rotational spectrum, internal rotation barrier and structure of 3,3,3-trifluoropropene." Molecular Physics 91, no. 4 (1997): 731–50. http://dx.doi.org/10.1080/00268979709482763.

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Dissertations / Theses on the topic "Barrier of rotation"

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Jiang, Jun Ph D. Massachusetts Institute of Technology. "Exploring the effect of a potential barrier on the molecular rotation-vibration structure." Thesis, Massachusetts Institute of Technology, 2017. http://hdl.handle.net/1721.1/113971.

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Thesis: Ph. D., Massachusetts Institute of Technology, Department of Chemistry, 2017.<br>Cataloged from PDF version of thesis.<br>Includes bibliographical references (pages 265-279).<br>The goal of this thesis is to explore the effect of a potential barrier on the rotation-vibration structure of the sulfur dioxide (SO₂) C̃̃ state and the acetylene (HCCH) Ã state. The minimum-energy geometry of both electronically excited states is qualitatively different from their respective electronic ground state geometry. The SO₂ C state exhibits a barrier (~100 cm-¹) at the C₂u, geometry along the antisym
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Flos, Manon. "Synthèse et analyse conformationnelle de dérivés du cannabidiol : vers l’atropisomérie autour de la liaison aryl-C(sp3)." Thesis, Reims, 2017. http://www.theses.fr/2017REIMP201/document.

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Le cannabidiol (CBD), constituant majeur non-psychotrope du Cannabis sativa, possède un grand nombre de propriétés pharmacologiques. Des dérivés du CBD présentant une rotation restreinte autour de la liaison simple aryl-C(sp3) ont été synthétisés avec deux modifications majeures apportés sur l’un ou/et l’autre cycle dans le but d’atteindre et de contrôler l’atropisomérie.Des phénylcyclohexanes diversement substitués ont été préparés par hydrogénation catalytique des phénylcyclohexènes correspondants. Des études de RMN dynamique et de modélisation moléculaire ont permis l’identification des épi
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Clements, Joseph Shelby II. "Synthesis of Insecticidal Mono- and Diacylhydrazines for Disruption of K+ Voltage-Gated Channels, and Elucidation of Regiochemistry and Conformational Isomerism by NMR Spectroscopy and Computation." Diss., Virginia Tech, 2017. http://hdl.handle.net/10919/77918.

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Based on the success of diacyl-tert-butylhydrazines RH-5849 and RH-1266 in controlling agricultural crop pests, we endeavored to synthesize our own diacylbenzyl- and arylhydrazine derivatives for use against the malaria vector Anopheles gambiae. In the process of producing a library of compounds for assay against An. gambiae, it became clear that employing regioselective acylation techniques (in molecules that feature two nucleophilic, acyclic nitrogen atoms α to one another) would be imperative. Synthesis of the library derivatives proceeded rapidly and after topical assay, we found three com
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Matthes, Annika. "Die Dehydro-Diels-Alder-Reaktion (DDA-Reaktion) als neue Methode zur Darstellung von Naphthalenophanen : ein neuer Zugang zu gespannten Ringsystemen und zur asymmetrischen Synthese von Biarylen." Phd thesis, Universität Potsdam, 2013. http://opus.kobv.de/ubp/volltexte/2013/6526/.

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Die Dissertation beschreibt die Herstellung von ringförmigen Verbindungen (Naphthalenophanen) mit Hilfe der Dehydro-Diels-Alder-Reaktion, wobei immer Enantiomerenpaare auftreten. Es wird der diastereoselektive Aufbau von Naphthalenophanen und der enantiomeren reine Aufbau von Biarylen untersucht. Desweiteren werden die physikalischen Eigenschaften der erhaltenen Verbindungen, wie die Phosphoreszenz, Trennbarkeit der entstehenden Enantiomere und die Ringspannung beschrieben.<br>The dissertation describes the synthesis of cyclic compounds (Naphthalenophanes) using the Dehydro-Diels-Alder reactio
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Zheng, Chao Durig James R. "Conformational stability from temperature-dependent infrared spectra of noble gas solutions, normal coordinate analyses, adjusted r₀ structural parameters and barrier to internal rotation of some substituted amine, hydrazine and three-membered ring compounds." Diss., UMK access, 2006.

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Thesis (Ph. D.)--Dept. of Chemistry and Dept. of Physics. University of Missouri--Kansas City, 2006.<br>"A dissertation in chemistry and physics." Advisor: James R. Durig. Typescript. Vita. Description based on contents viewed Jan. 29, 2007; title from "catalog record" of the print edition. Includes bibliographical references (leaves 447-460). Online version of the print edition.
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Phillips, Jessica M. "Axially chiral enamides : rotation barriers, substituent effects, and cyclisation reactions." Thesis, University of Warwick, 2017. http://wrap.warwick.ac.uk/101538/.

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The work presented in this thesis focuses on the synthesis, analysis and cyclisations of a series of N-halobenzylcycloalkenamides. Chapter 1 provides an introduction to atropisomerism, radical cyclisation and Heck cyclisation, including developments in the reaction conditions for radical and Heck cyclisations. The use of atropisomers in synthesis, and particularly in cyclisation reactions, is also discussed. Chapter 2 reports investigations into the effects of aryl, acyl and alkene substitution on the barrier to rotation about the N-alkenyl bond in a series of enamides. A range of enamides wer
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Fjellander, Ester. "Self-adaptable catalysts : Importance of flexibility and applications in asymmetric catalysis." Doctoral thesis, KTH, Organisk kemi, 2010. http://urn.kb.se/resolve?urn=urn:nbn:se:kth:diva-12852.

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The topic of this thesis is the design and synthesis of biaryl-based self adaptableligands for asymmetric metal catalysis. The results discussed in papers I-III are covered, together with some unpublished results concerning substrate-adaptable catalysts. A general survey of self-adaptable catalysts is presented first. The second chapter of this thesis starts with a survey of inversion barriers in biphenyl-based ligands and catalysts. Thereafter, the determination of barriers to conformational adaptation in dibenzoazepines and dibenzophosphepines is described. Palladium complexes with a diphosp
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Zalubovskis, Raivis. "Flexibility – a tool for chirality control in asymmetric catalysis." Doctoral thesis, KTH, Kemi, 2006. http://urn.kb.se/resolve?urn=urn:nbn:se:kth:diva-4166.

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This thesis deals with the design and synthesis of ligands for asymmetric catalysis: palladium catalyzed allylic alkylations, and rho-dium and iridium catalyzed hydrogenations of olefins. Chirally flexible phosphepine ligands based on biphenyl were synthesized and their properties were studied. The rotation barrier for configurationally flexible phosphepines was determined by NMR spectroscopy. The ratio of the atropisomers was shown to depend on the group bound to phosphorus. Only complexes with two homochiral ligands bound to the metal center were observed upon complexation with Rh(I). It was
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Niyogi, Sandip. "Synthesis and characterization of molecules to study the conformational barriers of fluorocarbon chains." Thesis, University of North Texas, 2000. https://digital.library.unt.edu/ark:/67531/metadc2511/.

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Fluorocarbons are known to be stiffer than their hydrocarbon analogues, a property that underlines the extensive industrial application of fluorocarbon materials. Although there has been previous studies on the rotational barrier of molecules having fluorocarbon centers, a detailed systematic study is necessary to quantify flurocarbon stiffness. The molecules, Pyrene-(CF2)n-Pyrene, Pyrene-(CF2)n-F, Pyrene-(CH2)n-Pyrene and Pyrene-(CH2)n-H were therefore synthesized to enable the determination of the barrier to rotation of the carbon backbone in fluorocarbons. Conformational studies will be com
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Von, Laue Lukas. "Transferts de protons par effet tunnel dans l'acide benzoique : le rôle des vibrations moléculaires." Université Joseph Fourier (Grenoble), 1997. http://www.theses.fr/1997GRE10060.

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Une description quantitative des transferts de protons inter- et intramoleculaires, qui sont parmi les reactions chimiques les plus fondamentales, demande une connaissance de la surface d'energie potentielle. Le present travail contribue a la caracterisation de cette surface pour un systeme modele, le monocristal d'acide benzoique. Proche des positions d'equilibre, la spectroscopie vibrationnelle apporte des informations, tandis que la barriere de potentiel est caracterisee par des mesures d'effet tunnel. Ces mesures, par spectroscopie optique (raman, absorption, emission) et diffusion quasi-e
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Book chapters on the topic "Barrier of rotation"

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Aranzazu-Suescun, Catalina, and Mihaela Cardei. "Weak-Barrier Coverage with Adaptive Sensor Rotation." In Combinatorial Optimization and Applications. Springer International Publishing, 2018. http://dx.doi.org/10.1007/978-3-030-04651-4_50.

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Wu, Yueshi, and Mihaela Cardei. "Distributed Algorithm for Mending Barrier Gaps via Sensor Rotation in Wireless Sensor Networks." In Combinatorial Optimization and Applications. Springer International Publishing, 2015. http://dx.doi.org/10.1007/978-3-319-26626-8_22.

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Ōki, Michinori. "Barriers to Rotation." In Reactivity and Structure Concepts in Organic Chemistry. Springer Berlin Heidelberg, 1993. http://dx.doi.org/10.1007/978-3-642-51024-3_3.

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Lowe, John P. "Barriers to Internal Rotation About Single Bonds." In Progress in Physical Organic Chemistry. John Wiley & Sons, Inc., 2007. http://dx.doi.org/10.1002/9780470171851.ch1.

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Wilson, E. Bright. "The Problem of Barriers to Internal Rotation in Molecules." In Advances in Chemical Physics. John Wiley & Sons, Inc., 2007. http://dx.doi.org/10.1002/9780470143483.ch9.

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Berreur, J., B. S. L. Collins, and J. Clayden. "12 Dynamic Kinetic Resolution and Dynamic Kinetic Asymmetric Transformation of Atropisomers." In Dynamic Kinetic Resolution (DKR) and Dynamic Kinetic Asymmetric Transformations (DYKAT). Georg Thieme Verlag KG, 2023. http://dx.doi.org/10.1055/sos-sd-237-00162.

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AbstractStereoenriched atropisomeric compounds find important applications in various areas of chemistry and their synthesis is therefore a critical research target. This chapter presents a selection of the best methods available to date for the asymmetric preparation of atropisomeric compounds using dynamic stereoselective techniques. For the more common (hetero)biaryls, the selected reactions are classified according to the conformational stability of the substrates, i.e. whether they are freely rotating or are configurationally stable and require a chemically induced, temporary lowering of
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Foster, T. J., and E. R. Morris. "Xanthan polytetramer: conformational stability as a barrier to synergistic interaction." In Gums and Stabilisers for the Food Industry 7. Oxford University PressOxford, 1994. http://dx.doi.org/10.1093/oso/9780199634651.003.0024.

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Abstract The genetically-engineered polytetramer variant of xanthan, in which the terminal mannose residues of each sidechain are absent, shows a thermoreversible conformational transition in solution (as monitored by DSC, CD and optical rotation). As found for xanthan, there is no detectable thermal hysteresis on cooling, and lffm decreases linearly with In I (where Tm is the transition midpoint temperature and I is ionic strength), but the Tm values for polytetramer are substantially higher. Native polytetramer shows normal solution rheology, but develops some xanthan-like ‘weak-gel’ propert
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WELTNER, WILLIAM, and KENNETH S. PITZER. "Methyl Alcohol: The Entropy, Heat Capacity and Polymerization Equilibria in the Vapor, and Potential Barrier to Internal Rotation." In World Scientific Series in 20th Century Chemistry. WORLD SCIENTIFIC, 1993. http://dx.doi.org/10.1142/9789812795960_0036.

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Richard, Erik C., Kueih-Tzu Lu, Robert A. Walker, and James C. Weisshaar. "Barriers to internal rotation in substituted toluenes and their cations." In Advances in Gas Phase Ion Chemistry. Elsevier, 1998. http://dx.doi.org/10.1016/s1071-9687(98)80007-5.

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Baer, Tomas, and William L. Hase. "Product Energy Distributions." In Unimolecular Reaction Dynamics. Oxford University Press, 1996. http://dx.doi.org/10.1093/oso/9780195074949.003.0011.

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The measurement of product translational and rotational energies, and in some cases vibrational energy, is often more readily accomplished than the measurement of the dissociation rate. As a result there exists a considerable body of experimental information about product energy distributions (FED) for many classes of reactions. The only simple model for treating these FED is the statistical one; however, there is a considerable diversity in its application. In the dissociation of large molecules at moderate to large excess energies, the translational, rotational, and vibrational energy distri
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Conference papers on the topic "Barrier of rotation"

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Guanti, Robert J., and Harvey P. Hack. "Determination of the Best Hydrodynamic Parameter for Modelling Flow on Cathodically Polarized Surfaces." In CORROSION 1987. NACE International, 1987. https://doi.org/10.5006/c1987-87267.

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Abstract Short and long term velocity experiments were performed utilizing a rotating cylinder electrode. This was to determine the best way to model in the laboratory the flow conditions in service on a cathodically polarized surface or on anodically polarized zinc. This was studied by measuring the cathodic current required to protect HY-80 steel, nickel-aluminum-bronze and commercially pure titanium in flowing seawater. Potentiodynamic scans on a one inch diameter cylindrical specimen were run at rotation speeds of 50, 100, 200, 800 and 2000 rpm. The limiting current portion of the resultin
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Tang, J., H. Jiang, Y. Han, and Z. Gong. "Characteristics of the Discharge Channels in Dielectric Barrier Discharge with Rotating High-Voltage Electrodes." In 2024 IEEE International Conference on Plasma Science (ICOPS). IEEE, 2024. http://dx.doi.org/10.1109/icops58192.2024.10626080.

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Jiang, N., G. Yu, H. Sun, et al. "Study on modified epoxy resin/AlN nanocomposites by dielectric barrier discharge with a rotating dielectric plate." In 2024 IEEE International Conference on Plasma Science (ICOPS). IEEE, 2024. http://dx.doi.org/10.1109/icops58192.2024.10627179.

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Symonds, N., B. G. Mellor, R. J. K. Wood, and S. Groves. "Wireline Wear Resistance of Polymeric Corrosion Barrier Coatings for Downhole Applications." In CORROSION 2000. NACE International, 2000. https://doi.org/10.5006/c2000-00170.

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Abstract Over the last few years, material options for downhole tubing in water injection wells, particularly subsea wells where the cost of workover is prohibitive, have received considerable attention. A great deal of test and field experience demonstrates that the internal tubing coatings currently available do not have sufficient mechanical robustness to survive mechanical damage occurring downhole. The mechanical damage aries from impact tool strike and wireline wear by the supporting wire. This communication reports the results of a study of wireline wear on various coatings under labora
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Acharya, Ranadip, John Maglieri, Huan Zhang, Zaffir Chaudhry, and Bruce Thompson. "Experimental and Numerical Investigation of Lubricant Retention on a Rotating Disc and Gear Teeth." In Vertical Flight Society 73rd Annual Forum & Technology Display. The Vertical Flight Society, 2017. http://dx.doi.org/10.4050/f-0073-2017-12145.

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Loss of the primary lubrication in a helicopter gearbox can result in a very rapid or even immediate failure of the system due to the much-reduced heat removal and the degrading tribological performance of the highly loaded gear contacts. While a limited understanding of this topic may be an acceptable risk for ground vehicles, however, a properly functioning gearbox is flight safety critical for helicopters. Therefore a deeper understanding of the degradation mechanisms is essential to accurately assess the time duration in which the helicopter gearbox can function under oil-out conditions an
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Aranzazu-Suescun, Catalina, and Mihaela Cardei. "UAV-aided Weak-Barrier Coverage with Adaptive Sensor Rotation." In 2019 IEEE International Systems Conference (SysCon). IEEE, 2019. http://dx.doi.org/10.1109/syscon.2019.8836822.

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Novick, Stewart, S. Cooke, Peter Groner, Wallace Pringle, Susanna Stephens, and W. Orellana. "TORSIONAL SPLITTING AND FOUR-FOLD BARRIER TO INTERNAL ROTATION: THE ROTATIONAL SPECTRA OF VINYLSULFUR PENTAFLUORIDE." In 73rd International Symposium on Molecular Spectroscopy. University of Illinois at Urbana-Champaign, 2018. http://dx.doi.org/10.15278/isms.2018.tk10.

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Piscelli, Bruno, and Rodrigo Cormanich. "The origin of the barrier of rotation of alpha carbonyl methyl groups." In Congresso de Iniciação Científica UNICAMP. Universidade Estadual de Campinas, 2019. http://dx.doi.org/10.20396/revpibic2720191859.

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Ye, Jing, Yonghua Xiong, and Haobin Dong. "A Multi-objective Rotation Optimization Based on GA for Heterogeneous Strong Barrier." In 2021 IEEE 26th International Conference on Emerging Technologies and Factory Automation (ETFA). IEEE, 2021. http://dx.doi.org/10.1109/etfa45728.2021.9613249.

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Gurusinghe, Ranil, and Michael Tubergen. "A COMPARISON OF BARRIER TO METHYL INTERNAL ROTATION OF METHYLSTYRENES: MICROWAVE SPECTROSCOPIC STUDY." In 70th International Symposium on Molecular Spectroscopy. University of Illinois at Urbana-Champaign, 2015. http://dx.doi.org/10.15278/isms.2015.tg10.

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Reports on the topic "Barrier of rotation"

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E.J. Synakowski, F.M. Levinton, M.C. Zarnstorff, R.E. Bell, S.H. Batha, and et al. Core Poloidal Rotation and Internal Trnasport Barrier Formation in TFTR. Office of Scientific and Technical Information (OSTI), 1998. http://dx.doi.org/10.2172/3750.

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Nevárez-Garibaldi, Roberto. Influences of Mixture Proportions and Test Conditions on the Strength and Stiffness of Wet-Mixed Soil and Cement. Deep Foundations Institute, 2018. http://dx.doi.org/10.37308/cpf-2014-slmx-1.

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The deep mixing method is an in-situ ground improvement technique in which cementitious binder is mixed with soil using equipment that penetrates at least several meters into the ground. The mixing equipment can be vertical-axis rotating augers with mixing blades, horizontal-axis rotating wheels or drums with teeth, or chain-saw type equipment in which a chain with teeth moves around a post that is inserted into the ground. The product of deep mixing is referred to as "cement-treated soil" in this report to distinguish it from "soil-cement", which is a term that has long been used to refer to
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Qian, Yuping, Yangjun Zhang, and WEILIN ZHUGE. Key Technology Challenges of Electric Ducted Fan Propulsion Systems for eVTOL. SAE International, 2023. http://dx.doi.org/10.4271/epr2023027.

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&lt;div class="section abstract"&gt;&lt;div class="htmlview paragraph"&gt;Electrical vertical takeoff and landing (eVTOL) vehicles for urban air mobility (UAM) are garnering increased attention from both the automotive and aerospace industries, with use cases ranging from individual transportation, public service, cargo delivery, and more. Distributed electric propulsion systems are their main technical feature; they determine vehicle size and propulsion efficiency and provide distributed thrust to achieve attitude control. Considering the intended role of eVTOL vehicles, ducted-fan systems ar
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Rodriguez, Dirk, and Cameron Williams. Channel Islands Nation Park: Terrestrial vegetation monitoring annual report - 2016. National Park Service, 2022. http://dx.doi.org/10.36967/2293561.

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Abstract:
This report presents the data collected in 2016 as part of the long-term terrestrial vegetation monitoring program at Channel Islands National Park. The purposes of the monitoring program are to document the long-term trends in the major vegetation communities within the park. The data collected are from 30 m point-line intercept transects. In the past, each transect was sampled annually. However, beginning in 2012 the program began adding randomly located transects to improve the representativeness of the sampling, and transitioned to a rotating panel design. Now only a core subset of the tra
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Operator crushed between a rotating barrel and its hoist support bar. U.S. Department of Health and Human Services, Public Health Service, Centers for Disease Control and Prevention, National Institute for Occupational Safety and Health, 2001. http://dx.doi.org/10.26616/nioshsface01mi003.

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