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Relevant bibliographies by topics / Clumping

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Academic literature on the topic 'Clumping'

Author: Grafiati

Published: 4 June 2021

Last updated: 11 February 2022

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Journal articles on the topic "Clumping"

1

Dove, Alan W. "Clumping lysosomes." Journal of Cell Biology 154, no. 1 (2001): 11. http://dx.doi.org/10.1083/jcb.1541iti6.

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Maroso, Mattia. "Unraveling protein clumping." Science 369, no. 6508 (2020): 1203.17–1205. http://dx.doi.org/10.1126/science.369.6508.1203-q.

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Biernaskie, Jay M., and Stuart A. West. "Cooperation, clumping and the evolution of multicellularity." Proceedings of the Royal Society B: Biological Sciences 282, no. 1813 (2015): 20151075. http://dx.doi.org/10.1098/rspb.2015.1075.

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The evolution of multicellular organisms represents one of the major evolutionary transitions in the history of life. A potential advantage of forming multicellular clumps is that it provides an efficiency benefit to pre-existing cooperation, such as the production of extracellular ‘public goods’. However, this is complicated by the fact that cooperation could jointly evolve with clumping, and clumping could have multiple consequences for the evolution of cooperation. We model the evolution of clumping and a cooperative public good, showing that (i) when considered separately, both clumping an

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Rubio-Díez, M. M., F. Najarro, J. O. Sundqvist, et al. "Herschel/PACS: Constraining clumping in the intermediate wind region of OB stars." Proceedings of the International Astronomical Union 9, S307 (2014): 137–39. http://dx.doi.org/10.1017/s1743921314006565.

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AbstractAt present, it is well established that previously accepted mass-loss rates (Ṁ) of luminous OB stars may be overestimated when clumping is neglected. Our Herschel/PACS Far-Infrared (Far-IR) observations of a set of OB stars allow us to improve our knowledge of clumping stratification, constraining clumping properties in intermediate wind regions. In this work, better sampled clumping structure estimates are provided for ι Ori, ε Ori and ξ Per as well as an initial estimate of the clumping properties of the wind from τ Sco. These observations will allow us to obtain reliable mass-loss r

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Bianco, Michele, Ilian T. Iliev, Kyungjin Ahn, et al. "The impact of inhomogeneous subgrid clumping on cosmic reionization – II. Modelling stochasticity." Monthly Notices of the Royal Astronomical Society 504, no. 2 (2021): 2443–60. http://dx.doi.org/10.1093/mnras/stab787.

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ABSTRACT Small-scale density fluctuations can significantly affect reionization, but are typically modelled quite crudely. Unresolved fluctuations in numerical simulations and analytical calculations are included using a gas clumping factor, typically assumed to be independent of the local environment. In Paper I, we presented an improved, local density-dependent model for the sub-grid gas clumping. Here, we extend this using an empirical stochastic model based on the results from high-resolution numerical simulations which fully resolve all relevant fluctuations. Our model reproduces well bot

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Mao, Yi, Jun Koda, Paul R. Shapiro, et al. "The impact of inhomogeneous subgrid clumping on cosmic reionization." Monthly Notices of the Royal Astronomical Society 491, no. 2 (2019): 1600–1621. http://dx.doi.org/10.1093/mnras/stz2986.

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ABSTRACT Cosmic reionization was driven by the imbalance between early sources and sinks of ionizing radiation, both of which were dominated by small-scale structure and are thus usually treated in cosmological reionization simulations by subgrid modelling. The recombination rate of intergalactic hydrogen is customarily boosted by a subgrid clumping factor, 〈n2〉/〈n〉2, which corrects for unresolved fluctuations in gas density n on scales below the grid-spacing of coarse-grained simulations. We investigate in detail the impact of this inhomogeneous subgrid clumping on reionization and its observ

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Haim, M., A. Trost, C. J. Maier, et al. "Cytokeratin 8 interacts with clumping factor B: a new possible virulence factor target." Microbiology 156, no. 12 (2010): 3710–21. http://dx.doi.org/10.1099/mic.0.034413-0.

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Staphylococcus aureus is a human pathogen of growing clinical significance, owing to its increasing levels of resistance to most antibiotics. Infections range from mild wound infections to severe infections such as endocarditis, osteomyelitis and septic shock. Adherence of S. aureus to human host cells is an important step, leading to colonization and infection. Adherence is mediated by a multiplicity of proteins expressed on the bacterial surface, including clumping factor B. In this study, we aimed to identify new targets of clumping factor B in human keratinocytes by undertaking a genome-wi

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Bible, Amber N., Gurusahai K. Khalsa-Moyers, Tanmoy Mukherjee, et al. "Metabolic Adaptations of Azospirillum brasilense to Oxygen Stress by Cell-to-Cell Clumping and Flocculation." Applied and Environmental Microbiology 81, no. 24 (2015): 8346–57. http://dx.doi.org/10.1128/aem.02782-15.

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ABSTRACTThe ability of bacteria to monitor their metabolism and adjust their behavior accordingly is critical to maintain competitiveness in the environment. The motile microaerophilic bacteriumAzospirillum brasilensenavigates oxygen gradients by aerotaxis in order to locate low oxygen concentrations that can support metabolism. When cells are exposed to elevated levels of oxygen in their surroundings, motileA. brasilensecells implement an alternative response to aerotaxis and form transient clumps by cell-to-cell interactions. Clumping was suggested to represent a behavior protecting motile c

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Wichelhaus, Thomas A., Sylvia Kern, Volker Schäfer, and Volker Brade. "Rapid Detection of Epidemic Strains of Methicillin-Resistant Staphylococcus aureus." Journal of Clinical Microbiology 37, no. 3 (1999): 690–93. http://dx.doi.org/10.1128/jcm.37.3.690-693.1999.

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Fifty methicillin-resistant Staphylococcus aureus(MRSA) initial isolates obtained from patients hospitalized in the orthopedic clinic of the Frankfurt University Hospital and 150 methicillin-sensitive Staphylococcus aureus (MSSA) isolates were investigated in this study to determine whether the Slidex Staph-Kit is capable of differentiating between MRSA and MSSA owing to its unique performance characteristics. The Slidex Staph-Kit is a combined latex hemagglutination test designed to detect clumping factor, protein A, and a specific surface immunogen for S. aureus. Clumping factor-positive str

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Dessart, L., D. J. Hillier, and K. D. Wilk. "Impact of clumping on core-collapse supernova radiation." Astronomy & Astrophysics 619 (October 30, 2018): A30. http://dx.doi.org/10.1051/0004-6361/201833278.

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There is both observational and theoretical evidence that the ejecta of core-collapse supernovae (SNe) are structured. Rather than being smooth and homogeneous, the material is made of over-dense and under-dense regions of distinct composition. Here, we have explored the effect of clumping on the SN radiation during the photospheric phase using 1D non-local thermodynamic equilibrium radiative transfer and an ejecta model arising from a blue-supergiant explosion (yielding a Type II-peculiar SN). Neglecting chemical segregation, we adopted a velocity-dependent volume-filling factor approach that

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Dissertations / Theses on the topic "Clumping"

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Bouret, J. C., T. Lanz, D. J. Hillier, and C. Foellmi. "Clumping in O-type Supergiants." Universität Potsdam, 2007. http://opus.kobv.de/ubp/volltexte/2008/1766/.

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We have analyzed the spectra of seven Galactic O4 supergiants, with the NLTE wind code CMFGEN. For all stars, we have found that clumped wind models match well lines from different species spanning a wavelength range from FUV to optical, and remain consistent with Hα data. We have achieved an excellent match of the P V λλ1118, 1128 resonance doublet and N IV λ1718, as well as He II λ4686 suggesting that our physical description of clumping is adequate. We find very small volume filling factors and that clumping starts deep in the wind, near the sonic point. The most crucial consequence of our

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Puls, Joachim, N. Markova, F. Najarro, and M. M. Hanson. "Clumping in O-star winds." Universität Potsdam, 2007. http://opus.kobv.de/ubp/volltexte/2008/1768/.

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Gräfener, G. "Clumping in hydrodynamic atmosphere models." Universität Potsdam, 2007. http://opus.kobv.de/ubp/volltexte/2008/1792/.

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We investigate the effect of wind clumping on the dynamics of Wolf-Rayet winds, by means of the Potsdam Wolf-Rayet (PoWR) hydrodynamic atmosphere models. In the limit of microclumping the radiative acceleration is generally enhanced. We examine the reasons for this effect and show that the resulting wind structure depends critically on the assumed radial dependence of the clumping factor D(r). The observed terminal wind velocities for WR stars imply that D(r) increases to very large values in the outer part of the wind, in agreement with the assumption of detached expanding shells.

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Blomme, R. "Corotating Interaction Regions and clumping." Universität Potsdam, 2007. http://opus.kobv.de/ubp/volltexte/2008/1810/.

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We present hydrodynamical models for Corotating Interaction Regions, which were used by Lobel (2007) to model the Discrete Absorption Components in HD 64760. We also discuss our failure to model the rotational modulations seen in the same star.

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Runacres, M. C. "Hydrodynamical models of clumping beyond 50 R∗." Universität Potsdam, 2007. http://opus.kobv.de/ubp/volltexte/2008/1803/.

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We present one-dimensional, time-dependent models of the clumps generated by the linedeshadowing instability. In order to follow the clumps out to distances of more than 1000 R∗, we use an efficient moving-box technique. We show that, within the approximations, the wind can remain clumped well into the formation region of the radio continuum.

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Moffat, Anthony F. J. "Observational overview of clumping in hot stellar winds." Universität Potsdam, 2007. http://opus.kobv.de/ubp/volltexte/2008/1763/.

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In the old days (pre ∼1990) hot stellar winds were assumed to be smooth, which made life fairly easy and bothered no one. Then after suspicious behaviour had been revealed, e.g. stochastic temporal variability in broadband polarimetry of single hot stars, it took the emerging CCD technology developed in the preceding decades (∼1970-80’s) to reveal that these winds were far from smooth. It was mainly high-S/N, time-dependent spectroscopy of strong optical recombination emission lines in WR, and also a few OB and other stars with strong hot winds, that indicated all hot stellar winds likely to b

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Urbaneja, M. A., R. P. Kudritzki, and Joachim Puls. "Clumping in the winds of O-type CSPNs." Universität Potsdam, 2007. http://opus.kobv.de/ubp/volltexte/2008/1780/.

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Recent studies of massive O-type stars present clear evidences of inhomogeneous and clumped winds. O-type (H-rich) central stars of planetary nebulae (CSPNs) are in some ways the low mass–low luminosity analogous of those massive stars. In this contribution, we present preliminary results of our on-going multi-wavelength (FUV, UV and optical) study of the winds of Galactic CSPNs. Particular emphasis will be given to the clumping factors derived by means of optical lines (Hα and Heii 4686) and “classic” FUV (and UV) lines.

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Massa, D. L., R. K. Prinja, and A. W. Fullerton. "The effects of clumping on wind line variability." Universität Potsdam, 2007. http://opus.kobv.de/ubp/volltexte/2008/1809/.

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We review the effects of clumping on the profiles of resonance doublets. By allowing the ratio of the doublet oscillator strenghts to be a free parameter, we demonstrate that doublet profiles contain more information than is normally utilized. In clumped (or porous) winds, this ratio can lies between unity and the ratio of the f-values, and can change as a function of velocity and time, depending on the fraction of the stellar disk that is covered by material moving at a particular velocity at a given moment. Using these insights, we present the results of SEI modeling of a sample of B supergi

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Kholtygin, A. F. "Modelling the induced clumping stochastic line profile variability." Universität Potsdam, 2007. http://opus.kobv.de/ubp/volltexte/2008/1818/.

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We model the line profile variability (lpv) in spectra of clumped stellar atmospheres using the Stochastic Clump Model (SCM) of the winds of early-type stars. In this model the formation of dense inhomogeneities (clumps) in the line driven winds is considered as being a stochastic process. It is supposed that the emission due to clumps mainly contributes to the intensities of emission lines in the stellar spectra. It is shown that in the framework of the SCM it is possible to reproduce both the mean line profiles and a common pattern of the lpv.

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St-Louis, N., and Anthony F. J. Moffat. "Do clumping corrections increase with decreasing mass-loss rates?" Universität Potsdam, 2007. http://opus.kobv.de/ubp/volltexte/2008/1769/.

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We report on new mass-loss rate estimates for O stars in six massive binaries using the amplitude of orbital-phase dependent, linear-polarimetric variability caused by electron scattering off free electrons in the winds. Our estimated mass-loss rates for luminous O stars are independent of clumping. They suggest similar clumping corrections as for WR stars and do not support the recently proposed reduction in mass-loss rates of O stars by one or two orders of magnitude.

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Books on the topic "Clumping"

1

Abraytis, Ron. Are you clumping trubs?: A novel. Writers Block Pub. Co, 1995.

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Abraytis, Ron. Are you clumping trubs?: A novel. Writers Block Pub. Co., 1995.

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3

Aldous, D. J. Probability approximations via the Poisson clumping heuristic. Springer-Verlag, 1989.

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4

Aldous, David. Probability Approximations via the Poisson Clumping Heuristic. Springer New York, 1989. http://dx.doi.org/10.1007/978-1-4757-6283-9.

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Aldous, David. Probability Approximations via the Poisson Clumping Heuristic. Springer New York, 2010.

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6

Bamboo World: Clumping Bamboos & How to Use Them. Kangaroo Press, 1999.

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7

Barrie, Marnie Margaret Jean *. A statistical comparison of quantitative methods of assessing muscle cell clumping. 1988.

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8

Nemeth, M. Barbara. The effects of pollen grain clumping on germination and early pollen tube growth in Clarkia unguiculata (Onagraceae). 1996.

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Book chapters on the topic "Clumping"

1

Moffat, Anthony F. J. "Consequences of Clumping in Hot-Star Winds." In Instability and Variability of Hot-Star Winds. Springer Netherlands, 1994. http://dx.doi.org/10.1007/978-94-011-0315-2_39.

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Lépine, Sébastien. "Effects of Wind Clumping on Colliding Winds." In Wolf-Rayet Stars: Binaries, Colliding Winds, Evolution. Springer Netherlands, 1995. http://dx.doi.org/10.1007/978-94-011-0205-6_90.

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Shipman, Russell F. "The Effects of Clumping on Calculated Grain Properties." In The Role of Dust in the Formation of Stars. Springer Berlin Heidelberg, 1996. http://dx.doi.org/10.1007/978-3-540-68594-4_57.

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Quicke, Donald L. J., Buntika A. Butcher, and Rachel A. Kruft Welton. "Spacing in two dimensions." In Practical R for biologists: an introduction. CABI, 2021. http://dx.doi.org/10.1079/9781789245349.0297.

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Abstract There are many interesting questions in biology that revolve around the spacing of individuals, for example in territoriality, or spatial clumping of genotypes. This chapter gives a very brief demonstration from basics of looking at the randomness of spacing of a sedentary, but not immobile animal, a European sea anemone. It will test for spatial structure using nearest neighbour distances.

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Quicke, Donald L. J., Buntika A. Butcher, and Rachel A. Kruft Welton. "Spacing in two dimensions." In Practical R for biologists: an introduction. CABI, 2021. http://dx.doi.org/10.1079/9781789245349.0025.

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Abstract There are many interesting questions in biology that revolve around the spacing of individuals, for example in territoriality, or spatial clumping of genotypes. This chapter gives a very brief demonstration from basics of looking at the randomness of spacing of a sedentary, but not immobile animal, a European sea anemone. It will test for spatial structure using nearest neighbour distances.

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Frazer, Gordon W., Richard A. Fournier, Sylvain G. Leblanc, and Jean-Michel N. Walter. "View Angle-Dependent Clumping Indices for Indirect LAI Estimation." In Managing Forest Ecosystems. Springer Netherlands, 2017. http://dx.doi.org/10.1007/978-94-024-1098-3_6.

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Krzywicki, Alfred, and Wayne Wobcke. "Exploiting Concept Clumping for Efficient Incremental News Article Categorization." In Advanced Data Mining and Applications. Springer Berlin Heidelberg, 2011. http://dx.doi.org/10.1007/978-3-642-25853-4_27.

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Krzywicki, Alfred, and Wayne Wobcke. "Exploiting Concept Clumping for Efficient Incremental E-Mail Categorization." In Advanced Data Mining and Applications. Springer Berlin Heidelberg, 2010. http://dx.doi.org/10.1007/978-3-642-17313-4_25.

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Crosby, Heidi A., Jakub M. Kwiecinski, and Alexander R. Horswill. "In Vitro Assay for Quantifying Clumping of Staphylococcus aureus." In Methods in Molecular Biology. Springer US, 2021. http://dx.doi.org/10.1007/978-1-0716-1550-8_5.

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Lépine, Sébastien. "Wavelet Analysis Of Wolf-Rayet Emission Line Variability: Evidence For Clumping." In Instability and Variability of Hot-Star Winds. Springer Netherlands, 1994. http://dx.doi.org/10.1007/978-94-011-0315-2_30.

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Conference papers on the topic "Clumping"

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Li, Huisong, Francois Berenger, Bor-Yuh Evan Chang, and Xavier Rival. "Semantic-directed clumping of disjunctive abstract states." In POPL '17: The 44th Annual ACM SIGPLAN Symposium on Principles of Programming Languages. ACM, 2017. http://dx.doi.org/10.1145/3009837.3009881.

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Marks, Matthew D., Charles F. Eubanks, and Kos Ishii. "Life-Cycle Clumping of Product Designs for Ownership and Retirement." In ASME 1993 Design Technical Conferences. American Society of Mechanical Engineers, 1993. http://dx.doi.org/10.1115/detc1993-0010.

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Abstract This paper describes a design strategy for mechanical systems called clumping and its effect on product value during the ownership and retirement phases of its life-cycle. A “clump” is a collection of components and/or subassemblies that share a physical relationship and some common characteristic based upon user intent. Clumping for product ownership values, i.e. reliability and serviceability, aims to increase component accessibility. Clumping for product retirement issues, i.e. reuse, recycling, and disposal, seeks to form aggregations of components for material compatibility, thus

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3

Tang, W., Y. Y. Lau, T. Strickler, et al. "Azimuthal clumping instabilities in a z-pinch wire array." In The 33rd IEEE International Conference on Plasma Science, 2006. ICOPS 2006. IEEE Conference Record - Abstracts. IEEE, 2006. http://dx.doi.org/10.1109/plasma.2006.1707154.

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He, Liming, Jing M. Chen, Jan Pisek, Crystal Schaaf, and Alan H. Strahler. "Global clumping index map derived from modis BRDF products." In IGARSS 2011 - 2011 IEEE International Geoscience and Remote Sensing Symposium. IEEE, 2011. http://dx.doi.org/10.1109/igarss.2011.6049427.

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Majidi, Carmel, Richard Groff, and Ron Fearing. "Clumping and Packing of Hair Arrays Manufactured by Nanocasting." In ASME 2004 International Mechanical Engineering Congress and Exposition. ASMEDC, 2004. http://dx.doi.org/10.1115/imece2004-62142.

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The gecko’s remarkable dry adhesive system, consisting of arrays of heirarchically structured hairs made from a stiff material, has motivated widespread interest in creating a synthetic dry adhesive whose adhesive properties derive more from its geometry than its bulk material properties. Recently, methods for synthesizing simple hair arrays have been developed. It has been observed that micro and nanosized synthetic hairs often adhere together to form clumps. This paper introduces several models and guidelines for predicting clumping conditions through hair geometry and lattice structure, and

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Massa, D., R. K. Prinja, Michael E. Van Steenberg, George Sonneborn, H. Warren Moos, and William P. Blair. "The Effects of Clumping on UV Wind Line Diagnostics." In FUTURE DIRECTIONS IN ULTRAVIOLET SPECTROSCOPY: A Conference Inspired by the Accomplishments of the Far Ultraviolet Spectroscopic Explorer Mission. AIP, 2009. http://dx.doi.org/10.1063/1.3154038.

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Li, Shihua, Zuqin Liang, Sen Lin, Adu Gong, and Jianwei Yue. "Estimating clumping index of woody canopy with terrestrial lidar data." In 2017 IEEE International Geoscience and Remote Sensing Symposium (IGARSS). IEEE, 2017. http://dx.doi.org/10.1109/igarss.2017.8128324.

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Ueno, Yuichiro, Mayuko Nakagawa, Toshiki Katsuta, Riho Aoki, and Naohiro Yoshida. "Equilibrium and Kinetic Fractionation on S-O Clumping of Sulfate." In Goldschmidt2020. Geochemical Society, 2020. http://dx.doi.org/10.46427/gold2020.2647.

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Bao, Yunfei. "Estimation of clumping index and LAI from Terrestrial LiDAR data." In IGARSS 2016 - 2016 IEEE International Geoscience and Remote Sensing Symposium. IEEE, 2016. http://dx.doi.org/10.1109/igarss.2016.7729188.

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Calders, K., P. Lewis, M. Disney, J. Verbesselt, J. Armston, and M. Herold. "Effects of clumping on modelling LiDAR waveforms in forest canopies." In IGARSS 2012 - 2012 IEEE International Geoscience and Remote Sensing Symposium. IEEE, 2012. http://dx.doi.org/10.1109/igarss.2012.6350693.

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Reports on the topic "Clumping"

1

Cochran, K. D. The clumping method. Office of Scientific and Technical Information (OSTI), 1989. http://dx.doi.org/10.2172/6023177.

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Steimke, J. L. Glass Frit Clumping And Dusting. Office of Scientific and Technical Information (OSTI), 2013. http://dx.doi.org/10.2172/1097231.

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Manninen, Terhikki, and Pauline Stenberg. Influence of forest floor vegetation on the total forest reflectance and its implications for LAI estimation using vegetation indices. Finnish Meteorological Institute, 2021. http://dx.doi.org/10.35614/isbn.9789523361379.

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Recently a simple analytic canopy bidirectional reflectance factor (BRF) model based on the spectral invariants theory was presented. The model takes into account that the recollision probability in the forest canopy is different for the first scattering than the later ones. Here this model is extended to include the forest floor contribution to the total forest BRF. The effect of the understory vegetation on the total forest BRF as well as on the simple ratio (SR) and the normalized difference (NDVI) vegetation indices is demonstrated for typical cases of boreal forest. The relative contribut

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