Relevant bibliographies by topics / Ring formation

Contents

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

Academic literature on the topic 'Ring formation'

Author: Grafiati
Published: 4 June 2021
Last updated: 25 July 2025

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Journal articles on the topic "Ring formation"

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Pellissier, Hélène. "The Use of Domino Reactions for the Synthesis of Chiral Rings." Synthesis 52, no. 24 (2020): 3837–54. http://dx.doi.org/10.1055/s-0040-1707905.

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This short review highlights the recent developments reported in the last four years on the asymmetric construction of chiral rings based on enantioselective domino reactions promoted by chiral metal catalysts.1 Introduction2 Formation of One Ring Containing One Nitrogen Atom3 Formation of One Ring Containing One Oxygen/Sulfur Atom4 Formation of One Ring Containing Several Heterocyclic Atoms5 Formation of One Carbon Ring6 Formation of Two Rings7 Conclusion
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Tuma, Rabiya S. "Contractile ring formation." Journal of Cell Biology 174, no. 3 (2006): 319b. http://dx.doi.org/10.1083/jcb.1743iti5.

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Guosheng Wang, Guosheng Wang, and Siyu Han and Ronghui Xu Siyu Han and Ronghui Xu. "The Ring Formation Mechanism in Cyclization of Berberine." Journal of the chemical society of pakistan 43, no. 3 (2021): 308. http://dx.doi.org/10.52568/000578/jcsp/43.03.2021.

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Berberine hydrochloride is a natural alkaloid with significant antitumor activities against many types of cancer cells, can be synthesized by cyclic reaction with hydrochloride condensate and glyoxal as raw materials and copper chloride as catalyst. In this study, the transition and energy change for the each reaction step was calculated by the density functional theory program Dmol3 in Materials Studio 2017. and the results testified that there are two ring formation in the cycliztion process, and according to the result we proposed the mechanism of this cyclization reaction. We also use infr
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Guosheng Wang, Guosheng Wang, and Siyu Han and Ronghui Xu Siyu Han and Ronghui Xu. "The Ring Formation Mechanism in Cyclization of Berberine." Journal of the chemical society of pakistan 43, no. 3 (2021): 308. http://dx.doi.org/10.52568/000578.

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Berberine hydrochloride is a natural alkaloid with significant antitumor activities against many types of cancer cells, can be synthesized by cyclic reaction with hydrochloride condensate and glyoxal as raw materials and copper chloride as catalyst. In this study, the transition and energy change for the each reaction step was calculated by the density functional theory program Dmol3 in Materials Studio 2017. and the results testified that there are two ring formation in the cycliztion process, and according to the result we proposed the mechanism of this cyclization reaction. We also use infr
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Combes, Françoise. "Ring and Lens Formation." International Astronomical Union Colloquium 157 (1996): 286–98. http://dx.doi.org/10.1017/s0252921100049927.

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AbstractThe dynamical mechanism to form rings at Lindblad resonances in a barred galaxy is now well-known: due to its dissipative character, the gas is forced in a spiral structure, and experiences torques from the bar potential. Angular momentum is transferred until gas accumulates in the resonant rings. Some problems remain however to account for all observations, such as the very different time-scales for nuclear, inner and outer ring formation, while the three are frequently observed in the same galaxy; the shapes, orientations and thickness of the rings, etc... The adequacy of the present
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Kim, Woong-Tae, Woo-Young Seo, and Yonghwi Kim. "Formation of nuclear rings of barred galaxies and star formation therein." Proceedings of the International Astronomical Union 9, S303 (2013): 43–53. http://dx.doi.org/10.1017/s174392131400012x.

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AbstractBarred galaxies contain substructures such as a pair of dust lanes and nuclear rings, with the latter being sites of intense star formation. We study the substructure formation as well as star formation in nuclear rings using numerical simulations. We find that nuclear rings form not by the Lindblad resonances, as previously thought, but by the centrifugal barrier that inflowing gas along dust lanes cannot overcome. This predicts a smaller ring in a more strongly barred galaxy, consistent with observations. Star formation rate (SFR) in a nuclear ring is determined primarily by the mass
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Wu, Yu-Ting, and Ing-Guey Jiang. "On the formation of ring galaxies." Proceedings of the International Astronomical Union 6, S271 (2010): 102–9. http://dx.doi.org/10.1017/s1743921311017509.

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AbstractThe formation scenario of ring galaxies is addressed in this paper. We focus on the P-type ring galaxies presented in Madore, Nelson & Petrillo (2009), particularly on the axis-symmetric ones. Our simulations show that a ring can form through the collision of disc and dwarf galaxies, and the locations, widths, and density contrasts of the ring are well determined. We find that a ring galaxy such as AM 2302-322 can be produced by this collision scenario.
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Pearce, F. R., and P. A. Thomas. "Ring formation in triaxial potentials." Monthly Notices of the Royal Astronomical Society 248, no. 4 (1991): 688–700. http://dx.doi.org/10.1093/mnras/248.4.688.

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Sammes, Peter G., and David J. Weller. "Steric Promotion of Ring Formation." Synthesis 1995, no. 10 (1995): 1205–22. http://dx.doi.org/10.1055/s-1995-4099.

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Dutta, Aloke K., and Jared A. Butcher. "Macrocyclic ring formation in micelles." Tetrahedron Letters 27, no. 29 (1986): 3343–44. http://dx.doi.org/10.1016/s0040-4039(00)84791-7.

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Dissertations / Theses on the topic "Ring formation"

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Olmsted, Susan C. "Star Formation in Ring Galaxies." Digital Commons @ East Tennessee State University, 2016. https://dc.etsu.edu/honors/322.

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Ring galaxies are specific types of interacting galaxies in which a smaller galaxy has passed through the center of the disk of another larger galaxy. The intrusion of the smaller galaxy causes the structure of the larger galaxy to compress as the smaller galaxy falls through, and to recoil back after the smaller galaxy passes through, hence the ring-like shape. In our research, we studied the star-forming regions of a sample of ring galaxies and compared to those of other interacting galaxies and normal galaxies. Using UV, optical, and IR archived images in twelve wavelengths from three tele
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Sutton, Phil J. "Saturn's turbulent F ring." Thesis, Loughborough University, 2015. https://dspace.lboro.ac.uk/2134/18475.

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As our abilities to utilise high performance computing to theoretically probe many astrophysical systems increases, a genuine need to relate to real systems becomes ever more important. Here, Saturn s rings can be used as a nearby laboratory to investigate in real time many astrophysical processes. One such system is the narrow F ring and its interaction with its inner shepherd moon Prometheus. Through numerical modelling and direct observations of the in-situ spacecraft Cassini we find new and exciting dynamics. These might help explain some of the asymmetries witnessed in the distribution of
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Iodice, Enrichetta. "Formation Scenarios for Polar Ring Galaxies." Doctoral thesis, SISSA, 2001. http://hdl.handle.net/20.500.11767/4321.

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Hylands, Kevin Alexander. "Nitrate ester formation from small ring heterocycles." Thesis, University of Exeter, 1996. http://ethos.bl.uk/OrderDetails.do?uin=uk.bl.ethos.337731.

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Harter, Braxton Nicholas. "Lagrangian Coherent Structures in Vortex Ring Formation." The Ohio State University, 2019. http://rave.ohiolink.edu/etdc/view?acc_num=osu1565828293505214.

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Robertson, Jeremy. "Ring expansion reaction via homolytic pathways." Thesis, University of Oxford, 1990. http://ora.ox.ac.uk/objects/uuid:194ca194-4848-470b-a21f-c16869257b96.

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The preparation of carbocyclic medium rings by two electron processes is reviewed with particular reference to the synthesis of natural products. The formation of medium rings by oxidative and homolytic methods is also reviewed. The synthesis and behaviour of both cis- and tran- ring expansion precursors is described. The 1,4-addition of tributylstannyl lithium to a range of cyclic α,β-unsaturated ketones was performed and procedures found whereby the so-formed enolates could be alkylated with a variety of electrophiles. Using these procedures a range of trans- ring expansion precursors were o
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Tigges, Sophia E. "The relationship between Centaur activity and ring formation." Thesis, Massachusetts Institute of Technology, 2018. http://hdl.handle.net/1721.1/115778.

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Thesis: S.B., Massachusetts Institute of Technology, Department of Earth, Atmospheric, and Planetary Sciences, 2018.<br>Cataloged from PDF version of thesis.<br>Includes bibliographical references (pages 22-25).<br>Introduction: Centaurs are small bodies whose orbits lie between those of Jupiter and Neptune (Gehrels, 1999). They are thought to be transition objects that originate in the Kuiper belt and occupy the cis-Neptunian region before potentially becoming Jupiter-family or other short-period comets (Dones, Levison, & Duncan, 1996). Their short dynamical lifetimes are on the order of 106
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Prasad, Chaturvedula V. "Annulation and cycloaromatization reactions of 3-aryl (alkyl) thio-1-trimethylsiloxy-1-methoxy-1,3-butadienes." Thesis, McGill University, 1986. http://digitool.Library.McGill.CA:80/R/?func=dbin-jump-full&object_id=75442.

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The title compounds were synthesized from methyl 3-aryl(alkyl)thio crotonic acids by deprotonation followed by silylation. The reactions of dienes with a number of carbonyl electrophiles under Lewis-acid catalysed conditions were investigated. The dienes exclusively give $ gamma$-alkylated products. The thio substituent enhances the $ gamma$-selectivity.<br>The reactions of dienes with a number of 1,3-dicarbonyl equivalents have been studied and a cycloaromatization reaction has been developed for the regiocontrolled synthesis of aryl sulfides in a 3C + 3C combination. The role of dienes in Di
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Lam, Yan-yu Sarah, and 林恩如. "Studies and applications of intermolecular (4+3) cycloaddition reactions of epoxy and aziridinyl enolsilanes." Thesis, The University of Hong Kong (Pokfulam, Hong Kong), 2013. http://hdl.handle.net/10722/206359.

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Schaefer, Anthony G. "Part 1, stereoselection in (4+2) cycloadditions ; Part 2, synthesis of 14-epiupial /." The Ohio State University, 1987. http://rave.ohiolink.edu/etdc/view?acc_num=osu1487585645577956.

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Books on the topic "Ring formation"

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1954-, Giuliano Robert M., American Chemical Society. Division of Carbohydrate Chemistry., and American Chemical Society Meeting, eds. Cycloaddition reactions in carbohydrate chemistry. American Chemical Society, 1992.

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1933-, Tebby John C., ed. Alkynes in cycloadditions. Wiley, 2014.

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1930-, Hassner Alfred, ed. Synthesis of heterocycles via cycloadditions II. Springer, 2008.

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Valters, Raimonds E. Ring-chain tautomerism. Plenum, 1985.

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Appelbe, Ruth. Synthetic applications of cationic arene-alkene cyclisations. University College Dublin, 1997.

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Manus, Eileen Mc. Oxazolidine and thiazolidine ring opening reactions. University College Dublin, 1996.

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Margetic, Davor. Microwave assisted cycloaddition reactions. Nova Science Publishers, 2012.

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Harmata, Michael. Advances in cycloaddition. JAI Press, 1999.

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de, Meijere A., ed. Small ring compounds in organic synthesis. Springer-Verlag, 1986.

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I, Gevaza I͡U. Ėlektrofilʹnai͡a vnutrimolekuli͡arnai͡a t͡siklizat͡sii͡a olefinov. Nauk. dumka, 1990.

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Book chapters on the topic "Ring formation"

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Yu, Yifei, and Chaoqun Liu. "Vortex Ring Formation." In Synthesis Lectures on Engineering, Science, and Technology. Springer International Publishing, 2024. http://dx.doi.org/10.1007/978-3-031-53670-0_8.

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Akhmetov, D. G. "Vortex Ring Formation." In Vortex Rings. Springer Berlin Heidelberg, 2009. http://dx.doi.org/10.1007/978-3-642-05016-9_5.

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Danaila, Ionut, Felix Kaplanski, and Sergei S. Sazhin. "Formation Number of Vortex Rings." In Vortex Ring Models. Springer International Publishing, 2021. http://dx.doi.org/10.1007/978-3-030-68150-0_6.

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Schmidt, Johann Friedrich Julius. "The Ring mountain Formation." In Historical & Cultural Astronomy. Springer International Publishing, 2020. http://dx.doi.org/10.1007/978-3-030-37269-9_18.

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Vasilyev, Stanislav A., and Igor N. Lebedev. "Molecular Mechanisms of Ring Chromosome Formation and Instability." In Human Ring Chromosomes. Springer International Publishing, 2024. http://dx.doi.org/10.1007/978-3-031-47530-6_33.

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Mayya, Y. D., and R. Romano. "Star Formation in Ring Galaxies." In New Quests in Stellar Astrophysics: The Link Between Stars and Cosmology. Springer Netherlands, 2002. http://dx.doi.org/10.1007/978-94-010-0393-3_32.

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Kumar, Navneet, Jaywant H. Arakeri, and M. S. Bobji. "Formation of a Pendular Liquid Ring." In Album of Porous Media. Springer International Publishing, 2023. http://dx.doi.org/10.1007/978-3-031-23800-0_46.

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Cater, J., J. Soria, and T. T. Lim. "Vortex Ring Formation at an Orifice." In Fluid Mechanics and Its Applications. Springer Netherlands, 1998. http://dx.doi.org/10.1007/978-94-011-5118-4_4.

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Ehresmann, Anne-Laure, Manuel Lafond, Lata Narayanan, and Jaroslav Opatrny. "Distributed Pattern Formation in a Ring." In Structural Information and Communication Complexity. Springer International Publishing, 2019. http://dx.doi.org/10.1007/978-3-030-24922-9_15.

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Silvestro, Roberto, Minhui He, Jian-Guo Huang, Hubert Morin, and Sergio Rossi. "From wood formation to tree ring." In Routledge Handbook of Forest Ecology, 2nd ed. Routledge, 2024. http://dx.doi.org/10.4324/9781003324072-42.

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Conference papers on the topic "Ring formation"

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Yu, Yan, Jinhao Ge, Maodong Gao, et al. "Counter-propagating solitons in coupled ring microresonators." In CLEO: Fundamental Science. Optica Publishing Group, 2024. http://dx.doi.org/10.1364/cleo_fs.2024.fth4f.4.

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Counter-propagating solitons are generated in CMOS-ready coupled microresonators featuring normal dispersion. In each direction, the soliton mode locks and compensates the dispersion through the formation of a pulse pair. Both the spectra and the radiofrequency beatnotes of counter-propagating solitons are observed.
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Gharib, Morteza. "Optimal Vortex Ring Formation: A Study of Vortex Ring Formation in Starting and Pulsed Jets (Keynote)." In ASME/JSME 2003 4th Joint Fluids Summer Engineering Conference. ASMEDC, 2003. http://dx.doi.org/10.1115/fedsm2003-45813.

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Pulsatile jet flows are found in many industrially relevant fluid mechanical problems. A common feature of these flows is that they are fundamentally a series of fluid pulses. This aspect of pulsatile jets implies vortex rings are a basic element of the resulting flow. The significance of this observation is based in part on the tendency of vortex rings to entrain ambient fluid during their formation, but more so on the recent discovery of the phenomenon of vortex ring pinch off. This phenomenon was characterized for starting jets (individual pulses) showing that for pulses sufficiently long w
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Stewart, Kelley C., and Pavlos P. Vlachos. "Vortex Ring Formation in Wall-Bounded Domains." In ASME 2010 3rd Joint US-European Fluids Engineering Summer Meeting collocated with 8th International Conference on Nanochannels, Microchannels, and Minichannels. ASMEDC, 2010. http://dx.doi.org/10.1115/fedsm-icnmm2010-31055.

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Vortex ring formation and propagation have been studied extensively in quiescent semi-infinite volumes. However, very little is known about the dynamics of vortex-ring formation in wall-bounded domains where vortex wall interaction will affect both the vortex ring pinch-off and propagation velocity. This study addresses this limitation and studies vortex formation in radially confined domains to analyze the effect of vortex-ring wall interaction on the formation and propagation of the vortex ring. Vortex rings were produced using a pneumatically driven piston cylinder arrangement and were ejec
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Tran, Dzung M., David Casbeer, Eloy Garcia, Isaac E. Weintraub, Dejan Milutinovic, and Satyanarayana G. Manyam. "Ring Formation Maneuver: Single-Integrator Kinematics." In AIAA Scitech 2021 Forum. American Institute of Aeronautics and Astronautics, 2021. http://dx.doi.org/10.2514/6.2021-0978.

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Ray, Bahni, Gautam Biswas, and Ashutosh Sharma. "Vortex Ring Formation on Drop Coalescence With Underlying Liquid." In ASME 2013 Heat Transfer Summer Conference collocated with the ASME 2013 7th International Conference on Energy Sustainability and the ASME 2013 11th International Conference on Fuel Cell Science, Engineering and Technology. American Society of Mechanical Engineers, 2013. http://dx.doi.org/10.1115/ht2013-17711.

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Numerical simulations using coupled level-set and volume-of-fluid (CLSVOF) method has been carried out to capture the vortex ring when a drop coalesces on a pool of liquid. A study has been done for the formation and motion of vortex rings generated when drops of liquid are allowed to come into contact at zero velocity with a quiescent flat surface of the same liquid.
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Leung, S. M., K. S. Cheng, W. Y. Chau, and K. L. Chan. "Formation and origin of asymmetric ring galaxies." In Back to the Galaxy. AIP, 1992. http://dx.doi.org/10.1063/1.43939.

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BARRIO, R. A., C. VAREA, T. ALARCÓN, C. B. PICALLO, and A. HERNANDEZ-MACHADO. "DYNAMICS OF Z-RING FORMATION IN LIPOSOMES." In International Symposium on Mathematical and Computational Biology. WORLD SCIENTIFIC, 2015. http://dx.doi.org/10.1142/9789814667944_0001.

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Tran, Dzung, David Casbeer, Eloy Garcia, Isaac E. Weintraub, and Dejan Milutinovic. "Ring Formation Maneuvering with Double Integrator Dynamics*." In 2021 International Conference on Unmanned Aircraft Systems (ICUAS). IEEE, 2021. http://dx.doi.org/10.1109/icuas51884.2021.9476770.

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Remeika, M., A. T. Hammack, S. Poltavtsev, et al. "Pattern Formation in the Exciton Inner Ring." In CLEO: QELS_Fundamental Science. OSA, 2013. http://dx.doi.org/10.1364/cleo_qels.2013.qm2d.6.

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Bagnato, V. S., L. G. Marcassa, M. Oriá, G. I. Surdutovich, and S. C. Zilio. "Observations on Ring Formation in Magneto-Optically Trapped Sodium Atoms." In OSA Annual Meeting. Optica Publishing Group, 1991. http://dx.doi.org/10.1364/oam.1991.pd19.

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In this report we present the experimental observation of rings of sodium atoms in a cold vapor cell and a theoretical model based in the existence of vortex forces leading to stable circular orbits. The apparatus for this experiment consists of a Zeeman-shift spontaneous-force trap(1), similar to the one used for Cs atoms(2). The magnetic field is produced by a pair of anti-Helmholtz coils and the three circularly polarized retro-reflected laser beams are tuned to the 3S1/2 (F=2) → 3P3/2 (F=3) transition of sodium. All laser beams carry a 1712 Mz sideband frequency working as a repumper for a
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Reports on the topic "Ring formation"

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Boatz, J. A., and J. D. Mills. Theoretical Determination of the Heats of Formation of Prospective Strained-Ring Rocket Fuels. Defense Technical Information Center, 1998. http://dx.doi.org/10.21236/ada397872.

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Bharadwaj, V. A Proposal to Investigate the Formation of Charmonium States Using the PBAR Accumulator Ring. Office of Scientific and Technical Information (OSTI), 1985. http://dx.doi.org/10.2172/1967485.

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Hughes, Joseph B. Novel Pathways of Nitroaromatic Metabolism: Hydroxylamine Formation, Reactivity and Potential for Ring Fission for Destruction of TNT-CU1214. Defense Technical Information Center, 2005. http://dx.doi.org/10.21236/ada462163.

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Wongkasemjit, Sujitra. Novel synthesis study of high surface area silica : final report. Chulalongkorn University, 2002. https://doi.org/10.58837/chula.res.2002.71.

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The sol-gel transition of tetra-coordinated spirosilicate via hydrolysis and condensation under acidic and basic conditions is examined to elucidate the effect of catalyst, reaction time and temperature on the properties of obtained gel. The main advantage of this process is the low temperature employed, producing a solid network with a high specific surface area. FTIR spectroscopy and TGA analysis were used to characterize the formation of siloxane bonds (Si-O-Si). It is found that spirosilicate can be hydrolyzed under both acid and base catalyzed conditions. The condensation rate to silicate
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Chirachanchai, Suwabun. A Novel ion extraction material derived from silica surface modified silybenzoxazine derivatives via host-guest properties. Chulalongkorn University, 2001. https://doi.org/10.58837/chula.res.2001.81.

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Silylbenzoxazine derivatives with different bulky group on benzene ring are synthesized employing aminosilane as a primary amine. The silylbenzoxazine derivatives with more bulky group exhibit low ion extraction percentage due to the difficulty of molecular assembly formation as a result of the bulky group repulsion combining with the long alkyl chain of silane. Silica surface modified benzoxazines are successfully achieved via silylbenzoxazine derivatives and show the ion extraction property for various alkali and alkaline earth metal ions. When silane is coupled onto silica, the benzoxazine
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Brenan, J. M., K. Woods, J. E. Mungall, and R. Weston. Origin of chromitites in the Esker Intrusive Complex, Ring of Fire Intrusive Suite, as revealed by chromite trace element chemistry and simple crystallization models. Natural Resources Canada/CMSS/Information Management, 2021. http://dx.doi.org/10.4095/328981.

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To better constrain the origin of the chromitites associated with the Esker Intrusive Complex (EIC) of the Ring of Fire Intrusive Suite (RoFIS), a total of 50 chromite-bearing samples from the Black Thor, Big Daddy, Blackbird, and Black Label chromite deposits have been analysed for major and trace elements. The samples represent three textural groups, as defined by the relative abundance of cumulate silicate phases and chromite. To provide deposit-specific partition coefficients for modeling, we also report on the results of laboratory experiments to measure olivine- and chromite-melt partiti
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KRUPINA, E. A. OLD ENGLISH LEXEME “RINC” IN IN THE GLOSSARIES AND IN THE TEXT OF THE POEM “BEOWULF”. Science and Innovation Center Publishing House, 2022. http://dx.doi.org/10.12731/2077-1770-2021-14-1-3-51-56.

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The article considers the Old English lexeme “rinc” with the help of etymology and word formation, the author uses contrastive-comparative analysis of the headword in the glossaries and contextual analysis of the lexeme.
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Шестопалова (Бондар), Катерина Миколаївна, and Олена Петрівна Шестопалова. Support of Inclusive Education in Kryvyi Rig. Padua, Italy, 2019. http://dx.doi.org/10.31812/123456789/3234.

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An analysis of the system of training, the implementation of a pilot project "SUPPORT OF INCLUSIVE EDUCATION IN KRYVYI RIG". The team that worked in project by GIZ (Deutsche Gesellschaft für Internationale Zusammenarbeit (GIZ) GmbH) create strategy for training teachers that include 6 modules: 1) regulatory and legislative framework for inclusive education; 2) inclusion ethics and philosophy; universal design and reasonable accommodation of educational space; 3) support team: interdisciplinary interation; algorithm of provision of psycho-pedagogical, corrective and development services; 4) ind
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Gantt, Elisabeth, Avigad Vonshak, Sammy Boussiba, Zvi Cohen, and Amos Richmond. Carotenoid-Rich Algal Biomass for Aquaculture: Astaxanthin Production by Haematococcus Pluvialis. United States Department of Agriculture, 1996. http://dx.doi.org/10.32747/1996.7613036.bard.

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The synthesis of carotenoids has been studied toward enhancing the production of ketocarotenoids, since fish and crustaceans raised by aquaculture require astaxanthin and other ketocaroteinoids in their feed for desirable pigmentation. Notable progress has been made in attaining the goals of determining improved conditions for ketocarotenoid production in Haematococcus pluvialis and in elucidating the carotenoid biosynthetic pathway. For production of astaxanthin a number of strains of the green alga Haematococcus were evaluated, a strain CCAG was found to be optimal for photoautotrophic growt
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Brophy, Kenny, and Alison Sheridan, eds. Neolithic Scotland: ScARF Panel Report. Society of Antiquaries of Scotland, 2012. http://dx.doi.org/10.9750/scarf.06.2012.196.

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The main recommendations of the Panel report can be summarised as follows: The Overall Picture: more needs to be understood about the process of acculturation of indigenous communities; about the Atlantic, Breton strand of Neolithisation; about the ‘how and why’ of the spread of Grooved Ware use and its associated practices and traditions; and about reactions to Continental Beaker novelties which appeared from the 25th century. The Detailed Picture: Our understanding of developments in different parts of Scotland is very uneven, with Shetland and the north-west mainland being in particular nee
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