Log in

Relevant bibliographies by topics / Cyclen

Academic literature on the topic 'Cyclen'

Author: Grafiati

Published: 4 June 2021

Last updated: 3 February 2022

Create a spot-on reference in APA, MLA, Chicago, Harvard, and other styles

Select a source type:

Contents

Journal articles
Dissertations / Theses
Books
Book chapters
Conference papers
Reports

Consult the lists of relevant articles, books, theses, conference reports, and other scholarly sources on the topic 'Cyclen.'

Next to every source in the list of references, there is an 'Add to bibliography' button. Press on it, and we will generate automatically the bibliographic reference to the chosen work in the citation style you need: APA, MLA, Harvard, Chicago, Vancouver, etc.

You can also download the full text of the academic publication as pdf and read online its abstract whenever available in the metadata.

Journal articles on the topic "Cyclen"

1

Wang, J., R. G. Harrison, and J. D. Lamb. "Anion Separation and Preconcentration with Cyclen and Cyclen-Resorcinarene Derivatives." Journal of Chromatographic Science 47, no. 7 (August 1, 2009): 510–15. http://dx.doi.org/10.1093/chromsci/47.7.510.

Full text

APA, Harvard, Vancouver, ISO, and other styles

2

Clarkson, Andrea J., Allan G. Blackman, and Charles R. Clark. "Preparation, structures and reactions of isomeric [Co(cyclen)(O2C2O2)]+ and [Co(cyclen)(O2CCH2CO2)]+ complexes (cyclen = 1,4,7,10-tetraazacyclododecane) †." Journal of the Chemical Society, Dalton Transactions, no. 5 (2001): 758–65. http://dx.doi.org/10.1039/b008350j.

Full text

APA, Harvard, Vancouver, ISO, and other styles

3

Pariya, Chandi, Ta-Yung Chi, Tarun K. Mishra, and Chung-Sun Chung. "Syntheses and X-ray crystal structures of [Zn(cyclen)–im–Zn(cyclen)](ClO4)3 and [Ni(cyclen)(imH)(ClO4)](ClO4) (cyclen=1,4,7,10-tetraazacyclododecane, im=imidazolate)." Inorganic Chemistry Communications 5, no. 2 (February 2002): 119–23. http://dx.doi.org/10.1016/s1387-7003(01)00359-8.

Full text

APA, Harvard, Vancouver, ISO, and other styles

4

Hervé, Gwénaëlle, Hélène Bernard, Nathalie Le Bris, Jean-Jacques Yaouanc, Henri Handel, and Loïc Toupet. "A new route to cyclen, cyclam and homocyclen." Tetrahedron Letters 39, no. 38 (September 1998): 6861–64. http://dx.doi.org/10.1016/s0040-4039(98)01497-x.

Full text

APA, Harvard, Vancouver, ISO, and other styles

5

Li, Na, Christopher English, Ammon Eaton, Austin Gillespie, T. C. Ence, Taylor J. Christensen, Adam Sego, Roger G. Harrison, and John D. Lamb. "Cation separation and preconcentration using columns containing cyclen and cyclen–resorcinarene derivatives." Journal of Chromatography A 1245 (July 2012): 83–89. http://dx.doi.org/10.1016/j.chroma.2012.05.036.

Full text

APA, Harvard, Vancouver, ISO, and other styles

6

Castillo-Blum, S. E., and M. E. Sosa-Torres. "A new isomer of the cis-[Co(cyclen)Cl2]+ cation (cyclen = 1,4,7,10-tetraazacyclododecane)." Polyhedron 14, no. 2 (January 1995): 223–29. http://dx.doi.org/10.1016/0277-5387(94)00245-a.

Full text

APA, Harvard, Vancouver, ISO, and other styles

7

Xia, Chuan-Qin, Liang-Bo Zhu, Xing-Yu Tan, Yang Yue, and Xiao-Qi Yu. "Synthesis of adenine-cyclen conjugates." Arkivoc 2005, no. 15 (September 9, 2005): 81–87. http://dx.doi.org/10.3998/ark.5550190.0006.f12.

Full text

APA, Harvard, Vancouver, ISO, and other styles

8

Lima, Luís M. P., David Esteban-Gómez, Rita Delgado, Carlos Platas-Iglesias, and Raphaël Tripier. "Monopicolinate Cyclen and Cyclam Derivatives for Stable Copper(II) Complexation." Inorganic Chemistry 51, no. 12 (May 31, 2012): 6916–27. http://dx.doi.org/10.1021/ic300784v.

Full text

APA, Harvard, Vancouver, ISO, and other styles

9

Yang, Wen, Christen M. Giandomenico, Michael Sartori, and Dennis A. Moore. "Facile N-1 protection of cyclam, cyclen and 1,4,7-triazacyclononane." Tetrahedron Letters 44, no. 12 (March 2003): 2481–83. http://dx.doi.org/10.1016/s0040-4039(03)00338-1.

Full text

APA, Harvard, Vancouver, ISO, and other styles

10

Prokhorov, Anton, Nathalie Le Bris, Hélène Bernard, Géraldine Claudon, and Henri Handel. "Cyclohexanedione Bisaminals as Intermediates for Cyclen, Homocyclen, and Cyclam Synthesis." Synthetic Communications 36, no. 21 (October 1, 2006): 3271–82. http://dx.doi.org/10.1080/00397910600910633.

Full text

APA, Harvard, Vancouver, ISO, and other styles

More sources

Dissertations / Theses on the topic "Cyclen"

1

Michaelis, Katrin. "Design, Synthese und molekularbiologische Evaluierung synthetischer Ribonucleasen mit Cyclen-Grundgerüst." [S.l.] : [s.n.], 1999. http://deposit.ddb.de/cgi-bin/dokserv?idn=960909303.

Full text

APA, Harvard, Vancouver, ISO, and other styles

2

Kaushik, Vivek. "Synthesis of cyclen based receptors and their use in separations biotechnology." VCU Scholars Compass, 2011. http://scholarscompass.vcu.edu/etd/2611.

Full text

Abstract:

A number of purification techniques such as adsorption, centrifugation, chromatography, extraction, distillation, filtration, precipitation etc. to name a few, are commonly used for the purification. However, due to a constant need of purification of even more complex crude mixtures, be it reaction mixtures, various proteins and DNA from cell extracts or medicinal compounds and fragrances from plant extracts, scientists needed to consistently develop new and improved techniques of purification. One such great advancement in the field of chromatography was the development of affinity chromatography. It revolutionized the field of bioseparations technology, and the dream of single stage purification of complex biological substrates such as proteins, enzymes, co-enzymes, DNA, RNA etc. was realized. Development of various precipitation techniques involving phase tags, acid-base induced precipitation, host-guest interactions, chemoselective precipitation etc. further simplified purification procedures for few substrates. However, only a few examples of chemoselective precipitation are known in literature.1, 2 In 2005, our group synthesized a cyclen-based receptor.9 This receptor showed very strong and very specific affinity for the pyrene based dyes (HPTS, APTS, PTA) under physiological conditions, similar to that of the natural receptors for their ligands. Upon interaction with the dye, this artificial receptor formed a low solubility complex which had micromolar stability. Various structure and activity studies established the essentiality of the macrocyclic structure of the receptor for the dye recognition. We further decided to study the effect of various substituents on the aromatic ring on the binding and quenching affinity of the receptor. A series of receptors bearing electron-withdrawing and electron-donating substituents were synthesized (receptor 4-6). We also synthesized a receptor having aliphatic groups instead of aromatic groups attached to the thiourea group (receptor 7) as well as a receptor lacking thiourea linkage (receptor 8). The results of fluorometric titrations of these receptors were consistent with the previous structure and activity studies, as the receptors having electron withdrawing nitro- and bromo substituents (receptor 4 and 6 respectively) on the aromatic groups (have increased π-stacking) were better receptor than cyclen 1. Interestingly, the receptor 5, bearing an electron-donating methoxy groups on the aromatic ring, has also shown an increase in the affinity towards HPTS. We speculated that this increased affinity could be due to the higher affinity of receptor 5 towards Na+ which was essential for the proper arrangement of the receptor binding arms. The receptor with the aliphatic chain (receptor 7) showed a complicated complexation process and showed variable fluorescence quenching at various receptor concentrations. This behaviour was probably due to the formation of complexes of a various stochiometries. Expectedly, the receptor lacking thiourea group (receptor 8) did not show any interaction.Since this receptor-dye pair formed a low solubility complex of micromolar stability upon interaction, we hypothesized that this receptor-dye pair can be used in the selective separation of substrates by chemoselective precipitation. We reasoned that if the substrate of interest can be attached to the dye, this dye-substrate conjugate then can be selectively precipitated from the reaction mixture upon addition of the receptor. We tried our concept for the separation of lactose from lactose/sucrose mixture. Being a reducing sugar, lactose was labeled with APTS dye, whereas sucrose that lacks the reducing end, remained unmodified. Application of the cyclen receptor to this mixture resulted in precipitation of APTS-lactose conjugate, leaving sucrose as the only component in the solution.10 By coupling APTS dye with lactose via an imine bond, we were able to successfully isolate unmodified lactose from the conjugate by subsequent hydrolysis of the conjugate. Next, we decided to use this dye-receptor pair in affinity chromatography. We hypothesized that if the receptor can be immobilized on some solid support then it can be specifically used as an affinity support for the substrates which are attached to the pyrene-based dyes. A new receptor with a functional group on the cyclen core was needed to immobilize the receptor on the solid support. The receptor 11 having an aromatic primary amine group was synthesized. This receptor was successfully immobilized on the NHS activated agarose resin. A series of fluorometric experiments were performed to determine the specificity and binding ability of the affinity support towards the pyrene dyes. Initial results of these experiments indicated that the affinity support was very effective as indicated by almost 95% fluorescence quench of a solution of 50 nM HPTS and affinity resin. This work has opened several new venues of research, and the applicability of this dye-receptor pair in the fields of biochemistry, pharmacology, cell biology etc. will be explored.

APA, Harvard, Vancouver, ISO, and other styles

3

Ganß, Alexander [Verfasser], and Stefan [Akademischer Betreuer] Kubik. "Neuartige supramolekulare Koordinationsverbindungen mit Cyclen- oder Cyclopeptiduntereinheiten / Alexander Ganß. Betreuer: Stefan Kubik." Kaiserslautern : Technische Universität Kaiserslautern, 2016. http://d-nb.info/1108270468/34.

Full text

APA, Harvard, Vancouver, ISO, and other styles

4

Fok, Wanyiu. "Theranostic porphyrin-cyclen gadolinium complex for photodynamic therapy and magnetic resonance imaging." HKBU Institutional Repository, 2019. https://repository.hkbu.edu.hk/etd_oa/706.

Full text

Abstract:

Photodynamic therapy (PDT) and Magnetic resonance imaging (MRI) are two techniques used in therapeutic and diagnostic purpose respectively. PDT can selectively kill the cancer cells by utilizing light and photosensitizer, while MRI provides invasive imaging on our interior bodies. If these two techniques combine, the probe can act as both PDT and MRI agent at the same time. This theranostic agents can bring great efficiency in the cancer treatment. In this project, a porphyrin-cyclen gadolinium based dual functions bio-probe, PZnGdL, is designed for diagnostic and photodynamic therapeutic functions. PZnGdL demonstrated a great T1 signal enhancement for MRI, in which its T1 relaxivity is 15.06 mM-1s-1 (at 1.4T, 37oC). The T1 relaxivity is five-fold higher than the clinically approved MRI contrasting agent Gd-DOTA, (2.92 at 1.4T, 37oC). Furthermore, PZnGdL exhibits low dark toxicity and high photocytotoxicity. Therefore, its photodynamic therapeutic index (PDI) in HeLa cells is as high as 1348 upon 1 J/cm2 light irradiation. Results from the present study show that PZnGdL is an effective photodynamic therapy agent as well as a safe and promising MRI contrasting agent.

APA, Harvard, Vancouver, ISO, and other styles

5

Bernier, Nicolas. "Macrocycles en série tétraazacycloalacnes : synthèse et étude de complexation de dérivés du cyclen." Brest, 2007. http://www.theses.fr/2007BRES2018.

Full text

Abstract:

Le travail consiste en la synthèse de ligands dimériques de type renforcés basés sur l’unité cyclen ainsi qu’en l’étude de leurs caractéristiques acido-basiques et de leurs propriétés complexantes vis-à-vis du cuivre (II) et de l’anion triphosphate. La voie de synthèse nécessite la mono-N et la frans-di-N-fonctionnalisation spécifique du cyclen. La stratégie développée au laboratoire, utilisant l’outil “aminal”, a été appliquée à la synthèse de quatre nouvelles familles de ligands renforcés. La méthodes est aisée et efficace. Les études préalables de protonation ont montré que les ligands dimériques renforcés présentent des propriétés fortement, voire extrêmement basiques. En conséquence, ils sont fortement chargés sur toute la gamme de pH. Les études menées en spectroscopie UV-visible et en Résonance Paramagnétique Electronique ont montré la formation des composés mono- et di-métallés pour les trois familles de ligands dimériques renforcés. Ces derniers se montrent particulièrement stables et présentent une géométrie pyramide à base carrée plus ou moins déformée, pour laquelle le ligand adopte une conformation cis-V. De plus, la présence d’interactions métal-métal a pu être détectée entre les sites paramagnétiques des complexes dimétallés. Les études de complexation de l’anion triphosphate indiquent que les ligands renforcés complexent fortement l’anion triphosphate sur toute la gamme de pH. Une forte augmentation des constantes de complexation a été observée par rapport aux dimères ne possédant pas de structure renforcée, particulièrement à pH neutre et basique
The project consist in the preparation of new constrained macropolycycles based on cyclen subunits and in the study of their acido-basic caracteristics and their ability to complex copper (II) and triphosphate anion. The synthesis require selective mono-N or trans-di-N-alkylation of the cyclen macrocycle. The approach developped by the laboratory using “aminal” protecting group, was applied to the synthesis of four new constrained family ligands. The method is versatile, efficient and atom economic. In protonation studies, the dimeric ligands exhibited strong or drastic basicity behaviour. Consequently, they present a high level of protonation all along the pH scale, even in basic medium. UV-visible and Electronic Paramagnetic Resonance spectra evidenced formation of mono- and di-metallic copper (II) species for all dimeric constrained macropolycycles. These complexes exhibit exceptional stabilities and present a distorded square pyramidal geometry for wich the host ligand adopt a folded cis-V conformation. Moreover, metal-metal interactions was detected between paramagnetic copper (Il) centres in dimetallic complexes. Complexation studies on triphosphate anion recognition point out that the dimeric reinforced ligands strongly interact with anionic species in all the pH scale. A strong increase of the complexation constants was observed in comparison with non constrained dimeric ligand, particularly at neutral and basic medium pH

APA, Harvard, Vancouver, ISO, and other styles

6

Walter, Jürgen [Verfasser]. "Cyclisierung von Tetraprolin : Aufbau verschiedener diastereomerer Cyclen aus D- und L-Prolin / Jürgen Walter." Ulm : Universität Ulm. Fakultät für Naturwissenschaften, 2000. http://d-nb.info/101547053X/34.

Full text

APA, Harvard, Vancouver, ISO, and other styles

7

jayasinha, arachchige Rajith Madushanka. "Solid-State NMR Structural Studies of Proteins Using Cyclen Based Paramagnetic Metal Chelating Probes." The Ohio State University, 2016. http://rave.ohiolink.edu/etdc/view?acc_num=osu1461765391.

Full text

APA, Harvard, Vancouver, ISO, and other styles

8

Perera-Bobusch, Chrischani [Verfasser]. "Synthesis and Biological Evaluation of Artificial Metalloproteases Based on Amphiphilic Cyclen Derivatives / Chrischani Perera-Bobusch." Berlin : Freie Universität Berlin, 2016. http://d-nb.info/109466295X/34.

Full text

APA, Harvard, Vancouver, ISO, and other styles

9

Hormann, Jan [Verfasser]. "DNA-Spaltung durch Kupfer(II)cyclen-basierte Metallonukleasen : Einfluss von Heteroatomaustausch und Interkalatorsubstitution / Jan Hormann." Berlin : Freie Universität Berlin, 2016. http://d-nb.info/1099282969/34.

Full text

APA, Harvard, Vancouver, ISO, and other styles

10

Bradbury, Adam John, and babradbury@optusnet com au. "METAL ION ACTIVATED ANION SENSORS." Flinders University. School of Chemistry Physics and Earth Sciences, 2007. http://catalogue.flinders.edu.au./local/adt/public/adt-SFU20080319.125059.

Full text

Abstract:

A series of new, octadentate, fluorescent, macrocyclic ligands have been prepared with a view to using them to study aromatic anion sequestration. The eight-coordinate Cd(II) complexes of the ligands have been shown capable of acting as receptors for a range of aromatic oxoanions. This has been demonstrated by perturbation of both 1H NMR chemical shift values and the anthracene derived fluorescence emission intensity as the potential guest anion and the host are combined. Non-linear least squares regression analysis of the resulting titration curves leads to the determination of binding constants in 20% aqueous 1,4-dioxane which lie in the range 10^2.3 M-1 (benzoate) to 10^7.5 M-1 (2,6-dihydroxybenzoate). By reference to the X-ray determined structures of related, but non-fluorescent inclusion complexes, the primary anion retention force is known to arise from hydrogen bonding between the anion and four convergent hydroxy groups that exist at the base of a cavity that develops in the complexes as their aromatic groups juxtapose upon coordination. This work reveals significant stability enhancement when hydroxy groups are positioned on the anion at points where O-H...pi hydrogen bonding to the aromatic rings that constitute the walls of the cavity becomes geometrically possible.

APA, Harvard, Vancouver, ISO, and other styles

More sources

Books on the topic "Cyclen"

1

Hormann, Jan. Cyclen-basierte Metallonucleasen. Wiesbaden: Springer Fachmedien Wiesbaden, 2015. http://dx.doi.org/10.1007/978-3-658-09269-6.

Full text

APA, Harvard, Vancouver, ISO, and other styles

2

Boulton, Jim. Wolverhampton cycles and cycling. Wolverhampton: Borough Council, 1988.

Find full text

APA, Harvard, Vancouver, ISO, and other styles

3

Barras, Richard. Property and the economic cycle: Building cycles revisited. London: Spon, 1994.

Find full text

APA, Harvard, Vancouver, ISO, and other styles

4

Aguiar, Mark. Emerging market business cycles: The cycle is the trend. Cambridge, MA: National Bureau of Economic Research, 2004.

Find full text

APA, Harvard, Vancouver, ISO, and other styles

5

Plosser, Charles I. Money and business cycles: A real business cycle interpretation. Cambridge, MA: National Bureau of Economic Research, 1990.

Find full text

APA, Harvard, Vancouver, ISO, and other styles

6

The global carbon cycle. Princeton: Princeton University Press, 2010.

Find full text

APA, Harvard, Vancouver, ISO, and other styles

7

The nutrient cycle. Huntington Beach, CA: Teacher Created Materials, 2016.

Find full text

APA, Harvard, Vancouver, ISO, and other styles

8

Lumsdon, Les. Cycle UK!: The essential guide to leisure cycling. Wilmslow: Sigma Leisure, 1996.

Find full text

APA, Harvard, Vancouver, ISO, and other styles

9

Wilson, Robert M. Gauging the nearness and size of cycle minimum. Washington, D.C: National Aeronautics and Space Administration, 1997.

Find full text

APA, Harvard, Vancouver, ISO, and other styles

10

Burstein, John. The cycle of life. Minneapolis: Fairview Press, 1997.

Find full text

APA, Harvard, Vancouver, ISO, and other styles

More sources

Book chapters on the topic "Cyclen"

1

Hormann, Jan. "Einleitung." In Cyclen-basierte Metallonucleasen, 1–10. Wiesbaden: Springer Fachmedien Wiesbaden, 2015. http://dx.doi.org/10.1007/978-3-658-09269-6_1.

Full text

APA, Harvard, Vancouver, ISO, and other styles

2

Hormann, Jan. "Ergebnisse und Diskussion." In Cyclen-basierte Metallonucleasen, 11–46. Wiesbaden: Springer Fachmedien Wiesbaden, 2015. http://dx.doi.org/10.1007/978-3-658-09269-6_2.

Full text

APA, Harvard, Vancouver, ISO, and other styles

3

Hormann, Jan. "Ausblick." In Cyclen-basierte Metallonucleasen, 47–48. Wiesbaden: Springer Fachmedien Wiesbaden, 2015. http://dx.doi.org/10.1007/978-3-658-09269-6_3.

Full text

APA, Harvard, Vancouver, ISO, and other styles

4

Hormann, Jan. "Experimenteller Teil." In Cyclen-basierte Metallonucleasen, 49–86. Wiesbaden: Springer Fachmedien Wiesbaden, 2015. http://dx.doi.org/10.1007/978-3-658-09269-6_4.

Full text

APA, Harvard, Vancouver, ISO, and other styles

5

Kinoshita-Kikuta, Emiko, Eiji Kinoshita, and Tohru Koike. "Zn(II)–Cyclen Polyacrylamide Gel Electrophoresis for SNP Detection." In Methods in Molecular Biology, 169–82. Totowa, NJ: Humana Press, 2009. http://dx.doi.org/10.1007/978-1-60327-411-1_10.

Full text

APA, Harvard, Vancouver, ISO, and other styles

6

Anderson, Eugene N. "Cycles and Cycling." In The East Asian World-System, 61–82. Cham: Springer International Publishing, 2019. http://dx.doi.org/10.1007/978-3-030-16870-4_2.

Full text

APA, Harvard, Vancouver, ISO, and other styles

7

Immorlica, Nicole, Mohammad Mahdian, and Vahab S. Mirrokni. "Cycle Cover with Short Cycles." In STACS 2005, 641–53. Berlin, Heidelberg: Springer Berlin Heidelberg, 2005. http://dx.doi.org/10.1007/978-3-540-31856-9_53.

Full text

APA, Harvard, Vancouver, ISO, and other styles

8

Pirincci Ercan, Deniz, and Frank Uhlmann. "Analysis of Cell Cycle Progression in the Budding Yeast S. cerevisiae." In Methods in Molecular Biology, 265–76. New York, NY: Springer US, 2021. http://dx.doi.org/10.1007/978-1-0716-1538-6_19.

Full text

Abstract:

AbstractThe cell cycle is an ordered series of events by which cells grow and divide to give rise to two daughter cells. In eukaryotes, cyclin–cyclin-dependent kinase (cyclin–Cdk) complexes act as master regulators of the cell division cycle by phosphorylating numerous substrates. Their activity and expression profiles are regulated in time. The budding yeast S. cerevisiae was one of the pioneering model organisms to study the cell cycle. Its genetic amenability continues to make it a favorite model to decipher the principles of how changes in cyclin-Cdk activity translate into the intricate sequence of substrate phosphorylation events that govern the cell cycle. In this chapter, we introduce robust and straightforward methods to analyze cell cycle progression in S. cerevisiae. These techniques can be utilized to describe cell cycle events and to address the effects of perturbations on accurate and timely cell cycle progression.

APA, Harvard, Vancouver, ISO, and other styles

9

Bosart, Lance F. "Observed Cyclone Life Cycles." In The Life Cycles of Extratropical Cyclones, 187–213. Boston, MA: American Meteorological Society, 1999. http://dx.doi.org/10.1007/978-1-935704-09-6_15.

Full text

APA, Harvard, Vancouver, ISO, and other styles

10

Lynch, Gordon S., David G. Harrison, Hanjoong Jo, Charles Searles, Philippe Connes, Christopher E. Kline, C. Castagna, et al. "Substrate Cycling (Futile Cycle)." In Encyclopedia of Exercise Medicine in Health and Disease, 826. Berlin, Heidelberg: Springer Berlin Heidelberg, 2012. http://dx.doi.org/10.1007/978-3-540-29807-6_3092.

Full text

APA, Harvard, Vancouver, ISO, and other styles

Conference papers on the topic "Cyclen"

1

Le, Phat, Scott Olson, and Taylor Shie. "Communication and Mitigation Strategies Related to the Leading Indicator of Pressure Cycle Fatigue." In 2020 13th International Pipeline Conference. American Society of Mechanical Engineers, 2020. http://dx.doi.org/10.1115/ipc2020-9555.

Full text

Abstract:

Abstract Pressure cycle fatigue has been shown in industry to be a contributing factor to pipeline failure. There are methods for pressure cycle fatigue monitoring that can be used as a leading indicator for the risk of the pipeline to fatigue related failure. Once lines with high cycling are identified, the risk of the cycling to the asset and the mitigation strategies for the cycling can be discussed within the organization. By mitigating the driving force of crack initiation and grow to failure in-service, the pipeline community is safer. Shell Pipeline Company, LP. (SPLC) experienced two in-service failures on the same pipeline in under a year where fatigue was a common root cause. Following the investigation of these failures, management requested communication of the risk of pressure cycle fatigue throughout the organization with the intent to mitigate the levels of pressure cycling across the system. All pipelines were put on a monthly dashboard of pressure cycling and sent to all staff for awareness and action. The company measures pressure cycling on all pipelines by normalizing the number of cycles to 25% of the specified minimum yield strength (SMYS). From January 2016 to December 2019, the number of monthly cycles on the top ten highest cycled segments were reduced from 45,000 cycles per month, to 18,970 cycles. This is a reduction of 58%. The number of Very Aggressively cycled pipelines was reduced from 2 to 0. The number of Aggressively cycled pipelines were reduced from 13 to as low as 3. This paper will share the strategies and methodologies used to achieve these results. The paper will share how the list of highly cycled pipelines and the monthly status reports were developed. The paper will also share how pressure cycling mitigation strategies for pipeline systems were developed in collaboration with facility engineering, business unit leads, controllers, schedulers, and integrity staff. The effectiveness of mitigation methods such as pressure reduction, installation of back-pressure control valves, changing of valve timing on startup and shutdown, changes to the scheduling on the pipeline, utilization of flying switch between tankage, etc. will be discussed. By reducing pressure cycling, the risk of fatigue related failures can be reduced. This program is continuously being improved because there is both management commitment and ownership of the issue throughout the organization.

APA, Harvard, Vancouver, ISO, and other styles

2

Bae, J., B. Betzler, and A. Worrall. "Neural Network Approach to Model Mixed Oxide Fuel Cycles in Cyclus, a Nuclear Fuel Cycle Simulator." In Tranactions - 2019 Winter Meeting. AMNS, 2019. http://dx.doi.org/10.13182/t31269.

Full text

APA, Harvard, Vancouver, ISO, and other styles

3

Kalnins, Arturs. "Fatigue Assessment of a Weld Joint Subjected to Thermal Stresses." In ASME 2005 Pressure Vessels and Piping Conference. ASMEDC, 2005. http://dx.doi.org/10.1115/pvp2005-71748.

Full text

Abstract:

Fatigue analysis is performed for a full-penetration weld joint, welded from both sides, connecting a cylindrical vessel to a flat head. It is subjected to a repeated transient cycle of ambient temperature inside the vessel. No pressure is cycled. Finite element heat transfer and elastic stress analyses are performed, and stress ranges are calculated. The allowable number of cycles for cyclic service is obtained by two structural stress methods. One is a method proposed for the ASME Boiler and Pressure Vessel code and the other is in the European Standard for unfired pressure vessels. It is found that for the same geometry and loading the former would permit 136,000 or 36,000 cycles while the latter would permit 8,000 cycles.

APA, Harvard, Vancouver, ISO, and other styles

4

Ruiz, Francisco. "The Adaptive Cycle Engine on Standard Duty Cycles." In WCX SAE World Congress Experience. 400 Commonwealth Drive, Warrendale, PA, United States: SAE International, 2019. http://dx.doi.org/10.4271/2019-01-0232.

Full text

APA, Harvard, Vancouver, ISO, and other styles

5

Jiao, Rong, and Stelios Kyriakides. "Ratcheting, Wrinkling and Collapse of Tubes Induced by Axial Cycling Under Internal Pressure." In ASME 2011 30th International Conference on Ocean, Offshore and Arctic Engineering. ASMEDC, 2011. http://dx.doi.org/10.1115/omae2011-49706.

Full text

Abstract:

A buried offshore pipeline is essentially axially constrained by the soil cover. Heating by the passage of hot oil at high pressure can plastically deform it. The deformation involves expansion of the diameter, which for thinner pipes can be accompanied by axisymmetric wrinkling. During a lifetime of 20 or more years, lines experience regular startup and shutdown cycles. This study examines how this cycling affects wrinkling and the hoop expansion of such lines. A set of experiments on super-duplex tubes with D/t of 28.5 was conducted using the following idealized cyclic loading history. A tube is first pressurized and then compressed into the plastic range to a level that initiates wrinkling. It is then cycled under stress control about a compressive mean stress while the pressure is kept constant. The combined loads cause simultaneous ratcheting in the hoop and axial directions as well as a gradual growth of the wrinkles. At some stage the amplitude of the wrinkles starts to grow exponentially with the number of cycles N leading to localization and collapse. The rate of ratcheting and the number of cycles to failure depend on the initial compressive pre-strain, the internal pressure and the stress cycle parameters. The problem is modeled as a shell with initial axisymmetric imperfections. A challenge in the simulations is that the cyclic plasticity model that is used must be capable of capturing correctly the type of biaxial material ratcheting that develops. The Dafalias-Popov two-surface nonlinear kinematic hardening model, enhanced and suitably calibrated is shown to capture the prevalent ratcheting deformations correctly leading to predictions that are in good agreement with the experimental results. The model is then used to evaluate the ratcheting behavior of pipes under thermal-pressure cyclic loading histories seen by buried pipelines.

APA, Harvard, Vancouver, ISO, and other styles

6

Chan, Kwai S., N. Sastry Cheruvu, and Gerald R. Leverant. "Predicting Coating Degradation Under Variable Peak Temperatures." In ASME 1999 International Gas Turbine and Aeroengine Congress and Exhibition. American Society of Mechanical Engineers, 1999. http://dx.doi.org/10.1115/99-gt-381.

Full text

Abstract:

The cyclic oxidation behavior of a CoCrAlY coating on a GTD-111 substrate was characterized by thermal cycling between ambient temperature and a variable peak temperature. The initial peak temperature of the thermal cycle was 954°C (1750°F) and tested for n1 cycles. The peak temperature was then increased to 1010°C (1850°F) for n2 cycles. Finally, the peak temperature was raised again to 1066°C (1950°F) for n3 cycles, where n1, n2, and n3 are in the range of a few hundred to a few thousand cycles. In all three cases, thermal cycles consisting of 55 minutes at the peak temperature and 5 minutes heating/cooling were used. Weight change of the test specimens was measured as a function of thermal cycle. The results were compared against a coating life model that treats coating degradation mechanisms including oxidation, spallation, and aluminum loss due to both inward and outward diffusion. Using this model, the influence of the variable peak temperature on coating life was predicted in accordance with experimental results.

APA, Harvard, Vancouver, ISO, and other styles

7

Kalnins, Arturs. "Twice-Yield Method for Assessment of Fatigue Caused by Fast Thermal Transient According to 2007 Section VIII-Division 2 of ASME B&PV Code." In ASME 2008 Pressure Vessels and Piping Conference. ASMEDC, 2008. http://dx.doi.org/10.1115/pvp2008-61397.

Full text

Abstract:

Fatigue analysis is performed for a pipe section subjected to a repeated transient cycle of bulk temperature inside the pipe. No pressure is cycled. Finite element transient heat transfer analysis is performed. The times of the stress reversals are determined by elastic stress analysis. The number of design cycles for cyclic service of the pipe is obtained following the fatigue assessment rules for unwelded locations using the elastic-plastic Twice-Yield method of 2007 Section VIII, Division 2, of ASME Boiler and Pressure Vessel Code. Details for the use of these rules are presented.

APA, Harvard, Vancouver, ISO, and other styles

8

Chuang, Han-Sheng, Steven T. Wereley, and Stephen C. Jacobson. "An Automated Cyclic Particle Extractor." In ASME 2009 International Mechanical Engineering Congress and Exposition. ASMEDC, 2009. http://dx.doi.org/10.1115/imece2009-10422.

Full text

Abstract:

Based on diffusion mechanism, a program-controlled cyclic particle extraction on an integrated PDMS microfluidic platform is presented. The platform comprises on-chip pneumatic peristaltic pumps and valves connected to a PC-based relay board, hence allowing programmable manipulations. The main concept is cycling a sample stream along with an extraction stream multiple times to enhance the particle separation. A sample solution containing 3-μm and 0.5-μm particles was utilized to demonstrate the process. The average flow rate was 4.75 mm/s and the extraction channel length was 84.3 mm. The relatively accumulative concentration for the 0.5-μm particle was 7.52% at the 1st cycle and became 37.99% at the 10th cycle. The result shows an expected improvement of particle concentration after the cyclic extraction. Higher efficiency can be achieved with more cycles.

APA, Harvard, Vancouver, ISO, and other styles

9

Bharadwaj, Karanam Vikas, and B. Sundar Rajan. "Index Codes for Interlinked Cycle Structures with Outer Cycles." In 2018 International Symposium on Information Theory and Its Applications (ISITA). IEEE, 2018. http://dx.doi.org/10.23919/isita.2018.8664244.

Full text

APA, Harvard, Vancouver, ISO, and other styles

10

Rumminger, Marc, Robert Dibble, Andrew Lutz, and Ann Yoshimura. "An integrated analysis of the Kalina cycle in combined cycles." In Intersociety Energy Conversion Engineering Conference. Reston, Virigina: American Institute of Aeronautics and Astronautics, 1994. http://dx.doi.org/10.2514/6.1994-4068.

Full text

APA, Harvard, Vancouver, ISO, and other styles

Reports on the topic "Cyclen"

1

Aguiar, Mark, and Gita Gopinath. Emerging Market Business Cycles: The Cycle is the Trend. Cambridge, MA: National Bureau of Economic Research, September 2004. http://dx.doi.org/10.3386/w10734.

Full text

APA, Harvard, Vancouver, ISO, and other styles

2

Plosser, Charles. Money and Business Cycles: A Real Business Cycle Interpretation. Cambridge, MA: National Bureau of Economic Research, January 1990. http://dx.doi.org/10.3386/w3221.

Full text

APA, Harvard, Vancouver, ISO, and other styles

3

Brown, J. S., P. A. Domanski, and E. W. Lemmon. CYCLE_D: NIST vapor compression cycle design program:. Gaithersburg, MD: National Institute of Standards and Technology, November 2018. http://dx.doi.org/10.6028/nist.nsrds.49-2018.

Full text

APA, Harvard, Vancouver, ISO, and other styles

4

Bliem, C. J. The Kalina cycle and similar cycles for geothermal power production. Office of Scientific and Technical Information (OSTI), September 1988. http://dx.doi.org/10.2172/6629373.

Full text

APA, Harvard, Vancouver, ISO, and other styles

5

Mummah, Kathryn. The Cyclus Fuel Cycle Simulator and Applications of Cyclus for International Safeguards. Office of Scientific and Technical Information (OSTI), May 2021. http://dx.doi.org/10.2172/1782631.

Full text

APA, Harvard, Vancouver, ISO, and other styles

6

Domanski, Piotr A., J. S. Brown, and Eric W. Lemmon. CYCLE_D: NIST Vapor Compression Cycle Design Program Version 5.1. National Institute of Standards and Technology, July 2016. http://dx.doi.org/10.6028/nist.nsrds.49.

Full text

APA, Harvard, Vancouver, ISO, and other styles

7

Eichenbaum, Martin, and Kenneth Singleton. Do Equilibrium Real Business Cycle Theories Explain Post-War U.S. Business Cycles? Cambridge, MA: National Bureau of Economic Research, May 1986. http://dx.doi.org/10.3386/w1932.

Full text

APA, Harvard, Vancouver, ISO, and other styles

8

De Long, J. Bradford. "Liquidation" Cycles: Old-Fashioned Real Business Cycle Theory and the Great Depression. Cambridge, MA: National Bureau of Economic Research, December 1990. http://dx.doi.org/10.3386/w3546.

Full text

APA, Harvard, Vancouver, ISO, and other styles

9

Brown, JS, PA Domanski, and EW Lemmon. CYCLE_D: NIST vapor compression cycle design program, version 5.1.1, user's guide. Gaithersburg, MD: National Institute of Standards and Technology, March 2017. http://dx.doi.org/10.6028/nist.nsrds.49-2017.

Full text

APA, Harvard, Vancouver, ISO, and other styles

10

Avila-Montealegre, Oscar, and Carter Mix. Common Trade Exposure and Business Cycle Comovement. Banco de la República de Colombia, December 2020. http://dx.doi.org/10.32468/be.1149.

Full text

Abstract:

A large empirical literature has shown that countries that trade more with each other have more correlated business cycles. We show that previous estimates of this relationship are biased upward because they ignore common trade exposure to other countries. When we account for common trade exposure to foreign business cycles, we find that (1) the effect of bilateral trade on business cycle comovement falls by roughly 25 percent and (2) common exposure is a significant driver of business cycle comovement. A standard international real business cycle model is qualitatively consistent with these facts but fails to reproduce their magnitudes. Past studies have used models that allow for productivity shock transmission through trade to strengthen the relationship between trade and comovement. We find that productivity shock transmission increases business cycle comovement largely because of a country-pair's common trade exposure to other countries rather than because of bilateral trade. When we allow for stronger transmission between small open economies than other country-pairs, comovement increases both from bilateral trade and common exposure, similar to the data.

APA, Harvard, Vancouver, ISO, and other styles

We offer discounts on all premium plans for authors whose works are included in thematic literature selections. Contact us to get a unique promo code!