Relevant bibliographies by topics / Filamente

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

Academic literature on the topic 'Filamente'

Author: Grafiati
Published: 4 June 2021
Last updated: 7 February 2022

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Journal articles on the topic "Filamente"

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Schäfer, K., H. Wang, A. Pich, M. Möller, C. Damm, and S. Ernst. "Lumineszierende Kunststofffilme und -filamente für Warn- und Sicherheitssysteme." Chemie Ingenieur Technik 82, no. 9 (August 27, 2010): 1474–75. http://dx.doi.org/10.1002/cite.201050105.

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Deschauer, M., and T. Müller. "Okulopharyngeale Muskeldystrophie." Nervenheilkunde 23, no. 08 (2004): 442–46. http://dx.doi.org/10.1055/s-0038-1626405.

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ZusammenfassungDie okulopharyngeale Muskeldystrophie (OPMD) ist eine autosomal-dominant vererbte Muskelerkrankung mit spätem Beginn, die klinisch durch eine Ptosis, Dysphagie und proximale Paresen gekennzeichnet ist. Die Erkrankung wird durch eine Trinukleotidvermehrung im Gen für das Poly-A-bindende Protein (PABPN1) verursacht. Hierdurch kommt es zu einer Verlängerung des Proteins um wenige Alanine, die zur Aggregation des Proteins führen. Diese Aggregate sind elektronenmikroskopisch als charakteristische intranukleäre Filamente nachweisbar. Der genaue pathogenetische Mechanismus, durch den es zum selektiven Befall der Muskelzellen und zur Ausbildung des typischen Phänotypes kommt, ist derzeit noch unklar.
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Pratt, Zachary L., Bingming Chen, Charles J. Czuprynski, Amy C. L. Wong, and Charles W. Kaspar. "Characterization of Osmotically Induced Filaments of Salmonella enterica." Applied and Environmental Microbiology 78, no. 18 (July 13, 2012): 6704–13. http://dx.doi.org/10.1128/aem.01784-12.

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ABSTRACTSalmonella entericaforms aseptate filaments with multiple nucleoids when cultured in hyperosmotic conditions. These osmotic-induced filaments are viable and form single colonies on agar plates even though they contain multiple genomes and have the potential to divide into multiple daughter cells. Introducing filaments that are formed during osmotic stress into culture conditions without additional humectants results in the formation of septa and their division into individual cells, which could present challenges to retrospective analyses of infectious dose and risk assessments. We sought to characterize the underlying mechanisms of osmotic-induced filament formation. The concentration of proteins and chromosomal DNA in filaments and control cells was similar when standardized by biomass. Furthermore, penicillin-binding proteins in the membrane of salmonellae were activein vitro. The activity of penicillin-binding protein 2 was greater in filaments than in control cells, suggesting that it may have a role in osmotic-induced filament formation. Filaments contained more ATP than did control cells in standardized cell suspensions, though the levels of two F0F1-ATP synthase subunits were reduced. Furthermore, filaments could septate and divide within 8 h in 0.2× Luria-Bertani broth at 23°C, while nonfilamentous control cells did not replicate. Based upon the ability of filaments to septate and divide in this diluted broth, a method was developed to enumerate by plate count the number of individual, viable cells within a population of filaments. This method could aid in retrospective analyses of infectious dose of filamented salmonellae.
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Chen, Che-Yu, Lee G. Mundy, Eve C. Ostriker, Shaye Storm, and Arnab Dhabal. "Self-gravitating filament formation from shocked flows: velocity gradients across filaments." Monthly Notices of the Royal Astronomical Society 494, no. 3 (April 10, 2020): 3675–85. http://dx.doi.org/10.1093/mnras/staa960.

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ABSTRACT In typical environments of star-forming clouds, converging supersonic turbulence generates shock-compressed regions, and can create strongly magnetized sheet-like layers. Numerical magnetohydrodynamic simulations show that within these post-shock layers, dense filaments and embedded self-gravitating cores form via gathering material along the magnetic field lines. As a result of the preferred-direction mass collection, a velocity gradient perpendicular to the filament major axis is a common feature seen in simulations. We show that this prediction is in good agreement with recent observations from the CARMA Large Area Star Formation Survey (CLASSy), from which we identified several filaments with prominent velocity gradients perpendicular to their major axes. Highlighting a filament from the north-west part of Serpens South, we provide both qualitative and quantitative comparisons between simulation results and observational data. In particular, we show that the dimensionless ratio Cv ≡ Δvh2/(GM/L), where Δvh is half of the observed perpendicular velocity difference across a filament, and M/L is the filament’s mass per unit length, can distinguish between filaments formed purely due to turbulent compression and those formed due to gravity-induced accretion. We conclude that the perpendicular velocity gradient observed in the Serpens South north-west filament can be caused by gravity-induced anisotropic accretion of material from a flattened layer. Using synthetic observations of our simulated filaments, we also propose that a density-selection effect may explain observed subfilaments (one filament breaking into two components in velocity space) as reported in recent observations.
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Fard, Mohammad Ansari, Sina Taamoli, and Shant Baghram. "Cosmological filaments in the light of excursion set of saddle points." Monthly Notices of the Royal Astronomical Society 489, no. 1 (August 9, 2019): 900–909. http://dx.doi.org/10.1093/mnras/stz2210.

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ABSTRACT The universe in large scales is structured as a network known as cosmic web. Filaments are one of the structural components of this web, which can be introduced as a novel probe to study the formation and evolution of structures and as a probe to study the cosmological models and to address the missing baryon problem. The aim of this work is to introduce an analytical framework to study the statistics of filaments such as number density of them and also to obtain the length-mass relation. For this objective, we model filaments as collapsed objects which have an extension in one direction, accordingly we use the ellipsoidal collapse to study the evolution of an over-dense region via gravitational instability. We find that the non-linear density of filaments in the epoch of formation is almost mass independent and is in order of ∼30. By introducing filament’s extended condition, we find a fitting function for length-mass relation. For the statistics of filaments, we propose a novel framework named excursion set of saddle points. In this approach, we count the saddle points of the density field Hessian matrix, and relate it to the count of filaments. In addition, we addressed the filament in filament problem with up-crossing approximation.
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Sundin, L., G. E. Nilsson, M. Block, and C. O. Lofman. "Control of gill filament blood flow by serotonin in the rainbow trout, Oncorhynchus mykiss." American Journal of Physiology-Regulatory, Integrative and Comparative Physiology 268, no. 5 (May 1, 1995): R1224—R1229. http://dx.doi.org/10.1152/ajpregu.1995.268.5.r1224.

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The effects of exogenously applied serotonin [5-hydroxytryptamine (5-HT)] on the distal arterial vasculature of gill filaments were observed using an epi-illumination microscope equipped with a water-immersion objective and connected to a video camera. In addition, ventral aortic flow (Q) and celiac artery pressure (PCA) were measured. Intra-arterial injection of serotonin (100 nmol/kg) completely stopped the blood flow in the distal part of the filaments and caused a rapid decrease of PCA. Repeatedly, the flow reduction was found to coincide with a constriction of the distal portion of the efferent filamental vasculature. Because there was no concomitant reduction in Q, it is concluded that a redistribution of blood to more proximal parts of the filaments occurred. After treatment with the serotonergic receptor antagonist methysergide, the vasoconstrictor effect of serotonin on the filamental vasculature was eliminated, while a decrease in PCA was still observed. The results demonstrate a specific site(s) for the serotonergic vasoconstriction in the distal portion of the filament.
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Fily, Yaouen, Priya Subramanian, Tobias M. Schneider, Raghunath Chelakkot, and Arvind Gopinath. "Buckling instabilities and spatio-temporal dynamics of active elastic filaments." Journal of The Royal Society Interface 17, no. 165 (April 2020): 20190794. http://dx.doi.org/10.1098/rsif.2019.0794.

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Biological filaments driven by molecular motors tend to experience tangential propulsive forces also known as active follower forces. When such a filament encounters an obstacle, it deforms, which reorients its follower forces and alters its entire motion. If the filament pushes a cargo, the friction on the cargo can be enough to deform the filament, thus affecting the transport properties of the cargo. Motivated by cytoskeletal filament motility assays, we study the dynamic buckling instabilities of a two-dimensional slender elastic filament driven through a dissipative medium by tangential propulsive forces in the presence of obstacles or cargo. We observe two distinct instabilities. When the filament’s head is pinned or experiences significant translational but little rotational drag from its cargo, it buckles into a steadily rotating coiled state. When it is clamped or experiences both significant translational and rotational drag from its cargo, it buckles into a periodically beating, overall translating state. Using minimal analytically tractable models, linear stability theory and fully nonlinear computations, we study the onset of each buckling instability, characterize each buckled state, and map out the phase diagram of the system. Finally, we use particle-based Brownian dynamics simulations to show our main results are robust to moderate noise and steric repulsion. Overall, our results provide a unified framework to understand the dynamics of tangentially propelled filaments and filament-cargo assemblies.
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Beisser, R., S. Werner, B. Heinrich, and J. Pelzer. "Emissionen aus 3D-Tischdruckern – Nachstellende Untersuchungen – Teil 1/Emissions from desktop 3D printers – more closely examined – Part 1." Gefahrstoffe 80, no. 01-02 (2020): 53–60. http://dx.doi.org/10.37544/0949-8036-2020-01-02-55.

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Um Aussagen über die Exposition am Arbeitsplatz gegenüber Emissionen von 3D-Tischdruckern treffen zu können, wurde das Emissionsverhalten eines exemplarischen 3D-Tischgerätes bei nachstellenden Untersuchungen in einer Prüfkammer genauer untersucht.   Beim Druck des Testkörpers in Form eines Würfels wurden für sieben ausgewählte Filamente die Konzentrationen der flüchtigen organischen Verbindungen und der Aldehyde sowie die Partikelanzahl gemessen. Alle Konzentrationen lagen weit unter den jeweiligen Arbeitsplatzgrenzwerten und auch unter dem Leitwert 1 für total volatile organic compounds (TVOC) oder Innenraumarbeitsplatzrichtwerten (RW). Die Partikelmessungen zeigten, dass umso mehr Partikel emittiert wurden, je wärmer ein Kunststoff verarbeitet werden musste. Alle Werte lagen unter dem Prüfwert von 3,5 ∙ 1011 Partikel pro 10 Minuten, der in der Vergabegrundlage für den Blauen Engel nach dem Umweltzeichen RAL UZ 205 „Bürogeräte mit Druckfunktion“ festgelegt ist.
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Alina, D., I. Ristorcelli, L. Montier, and M. Juvela. "Statistics on the relative orientation between magnetic fields and filaments hosting Planck Galactic Cold Clumps." Proceedings of the International Astronomical Union 14, A30 (August 2018): 104. http://dx.doi.org/10.1017/s1743921319003594.

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AbstractWe present a statistical analysis of the relative orientation between the plane-of-sky magnetic field and the filaments associated with the Galactic Cold Clumps. We separated polarization parameters components of the filaments and their background using thin optical medium assumption, the filaments were detected using the Rolling Hough Transform algorithm and we separated the clump and the filament contributions in our maps. We found that in high column density environments the magnetic fields inside the filaments and in the background are less likely to be aligned with each other. This suggests a decoupling between the inner and background magnetic fields at some stage of filaments’ evolution. A preferential alignment between the filaments and their inferred magnetic fields is observed in the whole selection if the clumps’ contribution is subtracted. Interestingly, a bimodal distribution of relative orientation is observed between the filamentary structures of the clumps and the filaments’ magnetic field. Similar results are seen in a subsample of nearby filaments. The relative orientation clearly shows a transition from parallel to no preferential and perpendicular alignment depending on the volume densities of both clumps and filaments. Our results confirm a strong interplay between the magnetic field and filamentary structures during their formation and evolutionary process.
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Lombardo, Andrew T., Shane R. Nelson, Guy G. Kennedy, Kathleen M. Trybus, Sam Walcott, and David M. Warshaw. "Myosin Va transport of liposomes in three-dimensional actin networks is modulated by actin filament density, position, and polarity." Proceedings of the National Academy of Sciences 116, no. 17 (April 9, 2019): 8326–35. http://dx.doi.org/10.1073/pnas.1901176116.

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The cell’s dense 3D actin filament network presents numerous challenges to vesicular transport by teams of myosin Va (MyoVa) molecular motors. These teams must navigate their cargo through diverse actin structures ranging from Arp2/3-branched lamellipodial networks to the dense, unbranched cortical networks. To define how actin filament network organization affects MyoVa cargo transport, we created two different 3D actin networks in vitro. One network was comprised of randomly oriented, unbranched actin filaments; the other was comprised of Arp2/3-branched actin filaments, which effectively polarized the network by aligning the actin filament plus-ends. Within both networks, we defined each actin filament’s 3D spatial position using superresolution stochastic optical reconstruction microscopy (STORM) and its polarity by observing the movement of single fluorescent reporter MyoVa. We then characterized the 3D trajectories of fluorescent, 350-nm fluid-like liposomes transported by MyoVa teams (∼10 motors) moving within each of the two networks. Compared with the unbranched network, we observed more liposomes with directed and fewer with stationary motion on the Arp2/3-branched network. This suggests that the modes of liposome transport by MyoVa motors are influenced by changes in the local actin filament polarity alignment within the network. This mechanism was supported by an in silico 3D model that provides a broader platform to understand how cellular regulation of the actin cytoskeletal architecture may fine tune MyoVa-based intracellular cargo transport.
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Dissertations / Theses on the topic "Filamente"

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Gutjahr, Petra. "Conformations of semiflexible polymers and filaments." Phd thesis, kostenfrei, 2007. http://opus.kobv.de/ubp/volltexte/2008/1591/.

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Forster, Caroline. "Der strahlungsbedingte Zerfall stratosphärischer Filamente in der Troposphäre." Diss., lmu, 2000. http://nbn-resolving.de/urn:nbn:de:bvb:19-3006.

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Forster, Caroline. "Der strahlungsbedingte Zerfall stratosphärischer Filamente in der Troposphäre." [S.l.] : [s.n.], 2000. http://deposit.ddb.de/cgi-bin/dokserv?idn=96098707X.

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Storr, Helmut. "Modellierung der Entstehung rotationssymmetrischer Filamente in der Zündphase grossvolumiger Hochdruckglimmentladungen." [S.l. : s.n.], 2000. http://deposit.ddb.de/cgi-bin/dokserv?idn=960596712.

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Buchwald, Rajko. "Optoelektrische Magnetfelduntersuchungen an Solarsilizium." Doctoral thesis, Technische Universitaet Bergakademie Freiberg Universitaetsbibliothek "Georgius Agricola", 2010. http://nbn-resolving.de/urn:nbn:de:bsz:105-qucosa-39445.

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Es werden die Ergebnisse der Untersuchungen von Stromverteilungen an Solarzellen und Solarmaterial durch magnetische, elektrische und optische Messmethoden gezeigt. Die neue magnetfeldtopographische Messmethode CAIC wird hierbei erläutert und deren Stromverteilungen mit Ergebnissen der IR-Durchlichtmikroskopie, der LBIC- und der LIT-Methode verglichen und ausgewertet. Auf Basis der durchgeführten Untersuchungen und der Annahme des Vorhandenseins einer Korngrenzendekoration werden die Stromverlaufsmodelle einer elektrisch aktiven Korngrenze für eine Probe mit pn-Übergang sowie für eine Probe ohne pn-Übergang gezeigt. Anhand von CAIC-Messungen können die Position und die Orientierung leitfähiger und oberflächennaher SiC- und Si3N4-Ausscheidungen in mc-Silizium ohne pn-Übergang ermittelt werden. Hierfür wird ein Stromverlaufsmodell gezeigt. Weiterhin werden Zellmikrobrüche, Fehler in der Kontaktstruktur und Layoutunterschiede der Kontaktstruktur durch CAIC-Messungen an Solarzellen eindeutig nachgewiesen.
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Bezler, Linn. "Expression zytoskeletaler Filamente und des vascular endothelial growth factor (VEGF) systems in der endotheliochorialen Plazenta von Hund und Katze." Giessen : VVB Lauferweiler, 2008. http://d-nb.info/989392392/34.

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Golzar, Mohammad. "Melt Spinning of the Fine PEEK Filaments." Doctoral thesis, Saechsische Landesbibliothek- Staats- und Universitaetsbibliothek Dresden, 2004. http://nbn-resolving.de/urn:nbn:de:swb:14-1101380771578-37580.

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The production of fine filaments using the melt spinning process needs considerable effort. A thermoplastic melt is stretched from the spinneret under a constant take-up speed. The high performance thermoplastic PEEK is solidified in the melt spinning process in a small distance and short time. Therefore, the fine PEEK filaments in the fibre formation zone underwent a high deformation and cooling rate. To make the melt spinning process stable and to produce the fine PEEK filaments, material properties and material behaviour are examined using on-line and off-line measurements. The fibre speed measured using Laser Doppler Anemometry and simultaneous temperature measured using infrared thermography enable both the strain rate and consequently the apparent extensional viscosity to be estimated. This provides the apparent extensional viscosity over the spinning line, which can itself show the structural development of PEEK fibres in the fibre formation zone, i.e. necking and solidification phenomena. The one-dimensional fibre formation model must include both procedural and material parameters. The heat transfer coefficient was estimated using the filament temperature measurement and showed a relatively high contribution of radiation and free convection in comparison to forced convection near the spinneret. The improved model of PEEK fibre formation gave a good agreement to both temperature and speed measurements, and also confirmed the high deformation rate effect on the extensional viscosity, which could be simulated with a properly generalised Newtonian constitutive equation. The end properties of the fibres, such as as-spun filament fineness, orientation (expressed using total birefringence) and total crystallisation (examined using DSC) are investigated in relation to different spinning conditions, i.e. take-up speed, throughput and the draw down ratio. The tensile test diagram results, measuring phenomena such as the elongation at break, tenacity, and the Young modulus of elasticity are also analysed in order to complete the correlation of the above-mentioned spinning conditions to the structural properties of as-spun fine PEEK filaments. The melt spinning of fine PEEK fibres under different spinning conditions is examined with the purpose of finding the optimum take-up speed and throughputs. Other spinning conditions, such as the temperature of melt processing, and the arrangement and diameter of the spinneret holes, are changed in order to make the process more stable. The recommendations for further study can be used to further examine some aspects of this work; however, this work presents a new concept for fine PEEK melt spinning supported by spinnability examinations under different spinning conditions and the improved model of fibre formation, which is also relevant for typical industrial processing applications.
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Mackay, Duncan Hendry. "Basic magnetic field configurations for solar filament channels and filaments." Thesis, University of St Andrews, 1997. http://hdl.handle.net/10023/14188.

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The three-dimensional magnetic structure of solar filament channels and filaments is considered. A simple analytical potential model of a filament channel is setup with line sources representing the overlying arcades and point sources the flux of the filament. A possible explanation of the distinct upper and lower bounds of a filament is given. A more detailed numerical force-free model with discrete flux sources is then developed and the effect of magnetic shear on the separatrix surface explored. Dextral channels are shown to exist for a wider range of negative values of the force-free alpha and sinistral channels for positive values of alpha. Potential models of a variety of coronal structures are then considered. The bending of a filament is modelled and a method of determining the horizontal component of a filament's magnetic field is proposed. Next, the observed opposite skew of arcades lying above switchbacks of polarity inversion lines is shown to be produced by a local flux imbalance at the corner of the switchback. Then, the magnetic structure of a particular filament in a filament channel is modelled using observations from a photospheric magnetogram. It is shown that dips in the filaments magnetic field could result from opposite polarity fragments lying below the filament. Finally, the formation of a specific filament channel and filament is modelled. The formation of the channel is shown to be due to the emergence of new flux in a sheared state. It is shown that convergence and reconnections between the new flux and old remnant flux is required for the filament to form. The field lines that represent the filament form a thin vertical sheet of flux. The changing angle of inclination of the sheet gives the appearance of twist. The method of formation is then generalised to other cases and it is shown that a hemispheric pattern consistent with the results of Martin et al. (1995) can be obtained.
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Meiklejohn, Bruce Ian 1959. "ISOLATION AND SEPARATION OF HUMAN CYTOKERATINS USING VARIOUS CHROMATOGRAPHIC TECHNIQUES." Thesis, The University of Arizona, 1987. http://hdl.handle.net/10150/276475.

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The cytokeratins from various human tissue were isolated using chromatographic techniques. The cytokeratins were first extracted from crude tissue using high and low salt buffers. It was necessary to use a denaturing agent such as urea to solubilize the resulting cytokeratin pellet. Imidazole also seemed to help solubilize the pellet and a reducing agent such as 2-Mercaptoethanol was not needed as previously believed. The acidic cytokeratins were separated from the neutral-basic cytokeratins using a DEAE ion-exchange column. The acidic cytokeratin fraction was further separated on a moderately polar reverse phase column with an acetonitrile gradient to eluted the proteins. Tetramethylammonium tetrafluoroborate was added to the mobile phase to react with any unreacted silanol groups on the stationary phase and trifluoroacetic acid was added to ion pair with the protein. The peaks were analyzed for purity using two dimensional electrophoresis and monoclonal antibodies that recognize the cytokeratins.
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Golzar, Mohammad. "Melt spinning of fine PEEK filaments Schmelzspinnen von feinen PEEK Filamenten /." [S.l. : s.n.], 2004. http://deposit.ddb.de/cgi-bin/dokserv?idn=973384654.

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Books on the topic "Filamente"

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Die Holschuld, oder, Garanaser Filamente. Wien: Czernin Verlag, 2012.

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Intermediate filaments: A review. Berlin: Springer-Verlag, 1985.

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Traub, Peter. Intermediate Filaments. Berlin, Heidelberg: Springer Berlin Heidelberg, 1985. http://dx.doi.org/10.1007/978-3-642-70230-3.

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The cytoskeleton: An introductory survey. Wien: Springer-Verlag, 1986.

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Filamentos. Buenos Aires: Ediciones del Dock, 2007.

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Krull, Rainer, and Thomas Bley, eds. Filaments in Bioprocesses. Cham: Springer International Publishing, 2015. http://dx.doi.org/10.1007/978-3-319-20511-3.

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Quinlan, Roy. Intermediate filament proteins. London: Academic Press, 1994.

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Inc, ebrary, ed. Composite filament winding. Materials Park, Ohio: ASM International, 2011.

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Quinlan, Roy. Intermediate filament proteins. London: Academic Press, 1995.

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Parry, David A. D. Intermediate filament structure. New York: Springer-Verlag, 1995.

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Book chapters on the topic "Filamente"

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Bachmann, Konrad. "Filamente und Tubuli." In Biologie für Mediziner, 87–105. Berlin, Heidelberg: Springer Berlin Heidelberg, 1986. http://dx.doi.org/10.1007/978-3-642-71119-0_7.

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Martin, Sara F., Rajesh Bilimoria, and Philip W. Tracadas. "Magnetic Field Configurations Basic to Filament Channels and Filaments." In Solar Surface Magnetism, 303–38. Dordrecht: Springer Netherlands, 1994. http://dx.doi.org/10.1007/978-94-011-1188-1_28.

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Mackay, Duncan H. "Formation and Large-Scale Patterns of Filament Channels and Filaments." In Solar Prominences, 355–80. Cham: Springer International Publishing, 2014. http://dx.doi.org/10.1007/978-3-319-10416-4_14.

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Traub, Peter. "Introduction." In Intermediate Filaments, 1. Berlin, Heidelberg: Springer Berlin Heidelberg, 1985. http://dx.doi.org/10.1007/978-3-642-70230-3_1.

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Traub, Peter. "Distribution of Intermediate Filaments." In Intermediate Filaments, 2–97. Berlin, Heidelberg: Springer Berlin Heidelberg, 1985. http://dx.doi.org/10.1007/978-3-642-70230-3_2.

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Traub, Peter. "In Vitro Assembly and Structure of Intermediate Filaments." In Intermediate Filaments, 98–136. Berlin, Heidelberg: Springer Berlin Heidelberg, 1985. http://dx.doi.org/10.1007/978-3-642-70230-3_3.

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Traub, Peter. "Synthesis of Intermediate Filament Proteins in Vitro." In Intermediate Filaments, 137–39. Berlin, Heidelberg: Springer Berlin Heidelberg, 1985. http://dx.doi.org/10.1007/978-3-642-70230-3_4.

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Traub, Peter. "Posttranslational Modification of Intermediate Filament Proteins." In Intermediate Filaments, 140–69. Berlin, Heidelberg: Springer Berlin Heidelberg, 1985. http://dx.doi.org/10.1007/978-3-642-70230-3_5.

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Traub, Peter. "Cellular Function(s) of Intermediate Filaments and Their Subunit Proteins." In Intermediate Filaments, 170–95. Berlin, Heidelberg: Springer Berlin Heidelberg, 1985. http://dx.doi.org/10.1007/978-3-642-70230-3_6.

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Traub, Peter. "Summary and Concluding Remarks." In Intermediate Filaments, 196–98. Berlin, Heidelberg: Springer Berlin Heidelberg, 1985. http://dx.doi.org/10.1007/978-3-642-70230-3_7.

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Conference papers on the topic "Filamente"

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Chandran, Preethi L., and Mohammad R. K. Mofrad. "Hydrodynamics and Semi-Flexible Filament Behavior." In ASME 2009 Summer Bioengineering Conference. American Society of Mechanical Engineers, 2009. http://dx.doi.org/10.1115/sbc2009-206748.

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In this paper we simulate the effect of hydrodynamic interaction on the Brownian dynamics of semiflexible filaments. Semiflexible filaments are those whose entropy-driven bending fluctuations are resisted by the elastic bending stiffness. Semiflexible filaments make up the structural scaffold of cell and tissue matrix, and understanding their dynamic behavior is necessary for studying force transmission and remodeling in cells and tissue matrix. Hydrodynamic interaction refers to force on filament mediated through the local solvent flow around it. The local solvent flow is induced by the motion of the filament itself. Dynamic studies of semiflexible filaments tend to assume a uniform friction coefficient at every point on the filament. However Lagamarsino et al [1] showed that even for a filament in uniform translation, most of the drag is localized at the filament ends, which increases the tendency of the filament to bend and rotate even under a uniform driving force. In this paper we explore how the combined effect of non-uniform friction coefficient due to hydrodynamic screening and the non-uniform local solvent flow due to the filament fluctuations affects its Brownian dynamics.
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Silva-Leon, Jorge, and Andrea Cioncolini. "Experiments on Vortex Shedding From Reconfigured Flexible Filaments Vibrating in Flow." In ASME 2019 International Mechanical Engineering Congress and Exposition. American Society of Mechanical Engineers, 2019. http://dx.doi.org/10.1115/imece2019-10393.

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Abstract This paper describes an experimental study of the spanwise vortex shedding frequencies from cantilever flexible filaments which are bent (reconfigured) when exposed to air crossflow. At a reduced velocity of approximately U* = 1500 (based on filament diameter) the filaments started to vibrate in the inline direction. Hot-wire anemometry was thus employed to investigate the wake flow of filaments of three aspect ratios (L/D = 38, 80, and 113) at Reynolds numbers Re < 300. Despite the large relative inclination angles between the filament and the flow direction, the vortex shedding frequency measured along the span of the filaments remained close to those of a cylinder in pure crossflow. Moreover, it was found that as the aspect ratio (axial length) of the filaments was increased, vortex shedding lost coherence towards the free end of the filaments, whereas this was not the case for the shortest aspect ratio filament currently tested. This is thought to be due to the interaction between the crossflow vortex shedding and the axial flow component developing along the wake of the inclined filaments. Through comparisons with stiff inclined wires it was confirmed that the spanwise vortex shedding behaviors observed (frequency and coherence) were not modulated by the motions of the filaments.
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Sommerfeld, Christian, Eckart Uhlmann, and Anton Hoyer. "Modelling of Brushing Processes." In ASME 2019 14th International Manufacturing Science and Engineering Conference. American Society of Mechanical Engineers, 2019. http://dx.doi.org/10.1115/msec2019-2833.

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Abstract Brushes consist of a body with fixed highly flexible filaments and can be used for deburring and surface finishing operations. During the brushing process, axial and tangential deflections of the highly flexible filaments lead to an adaptation to the shape of the workpiece and interaction between the filaments. The described complex contact behavior has been insufficiently investigated so far. For a better understanding of the contact between a brush and the workpiece surface, this paper presents a model based on physical principles. The model describes the dynamic behavior of a brush in contact with different workpiece geometries and consists of separate physical descriptions for the filaments of the brush, the workpiece surface and the occurring contacts. A description of a single filament is given by a multi-body system of rigid links. The rigid links are connected by joints which approximate the material behavior of the filaments. To approximate different geometries, the workpiece surface is specified by a polynomial. Contact can occur between the filaments and the workpiece surface as well as between the filaments. For the description of the occurring contacts, Hertz’s theory of elastic contact and Coulomb’s law of friction are used. The aforementioned physical descriptions are included in the Lagrange’s equations to obtain a system of equations of motion that calculates the deflection of the filaments of the brush and the acting forces during the contact with the workpiece surface. A numerical solution to the system of equations of motion was calculated by using experimentally determined material and contact properties of the filament. A comparison of the calculated forces with experimentally determined values shows good correlations for different workpiece surfaces and process parameters. In this context, the developed model calculates the progression and the maximum value of the acting contact forces. The results show a shorter contact length of the filament lc for a circular surface compared to a plane surface, and a rise of the maximum normal force Fn with the depth of cut ae. Furthermore, consideration of the filament interactions leads to a more accurate approximation of the brush-workpiece contact. Based on the findings, the developed model can be used to calculate predictions for different brushing processes which reduce the number of time-consuming preliminary tests for the process design.
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Hull, Emmett, Weston Grove, Meng Zhang, Xiaoxu Song, Z. J. Pei, and Weilong Cong. "Effects of Process Variables on Extrusion of Carbon Fiber Reinforced ABS Filament for Additive Manufacturing." In ASME 2015 International Manufacturing Science and Engineering Conference. American Society of Mechanical Engineers, 2015. http://dx.doi.org/10.1115/msec2015-9396.

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Additive manufacturing (3D printing) is a class of manufacturing processes where material is deposited in a layer-by-layer fashion to fabricate a three-dimensional part directly from a computer-aided design (CAD) model. With a current market share of 44%, thermoplastic-based additive manufacturing such as fused deposition modeling (FDM) is a prevailing technology. A preliminary extrusion process is required to produce thermoplastic filaments for use in FDM 3D printers. It is crucial that extruded filament must have constant dimensional accuracy for FDM 3D printers to produce the desired object with precision. In this study, carbon fibers were blended with acrylonitrile butadiene styrene (ABS) thermoplastics to produce carbon fiber reinforced ABS filaments in order to improve the mechanical properties of FDM-printed objects. During filament extrusion, three process variables showed significant effects on filament diameter, expansion percentage, and extrusion rate. These process variables included carbon fiber content, extrusion temperature, and nozzle size. The objective of this study is to test the feasible ranges of these process variables and to investigate their effects on filament extrusion. Results of this study will provide knowledge on quality improvement of carbon fiber reinforced ABS filament extrusion for additive manufacturing.
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5

Kroon, Martin. "A Theoretical Assessment of the Influence of Myosin Filament Dispersion on Smooth Muscle Contraction." In ASME 2011 Summer Bioengineering Conference. American Society of Mechanical Engineers, 2011. http://dx.doi.org/10.1115/sbc2011-53071.

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A new constitutive model for the biomechanical behavior of smooth muscle tissue is employed to investigate the influence of statistical dispersion in the orientation of myosin filaments. The number of activated cross-bridges between the actin and myosin filaments governs the contractile force generated by the muscle and also the contraction speed. A strain-energy function is used to describe the mechanical behavior of the smooth muscle tissue. The predictions from the constitutive model are compared to histological and isometric tensile test results for smooth muscle tissue from swine carotid artery. In order to be able to predict the active stress at different muscle lengths, a filament dispersion significantly larger than the one observed experimentally was required. Furthermore, a comparison of the predicted active stress for a case of uniaxially oriented myosin filaments and a case of filaments with a dispersion based on the experimental histological data shows that the difference in generated stress is noticeable but limited. Thus, the results suggest that myosin filament dispersion alone cannot explain the increase in active muscle stress with increasing muscle stretch.
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Mertiny, Pierre, Christian Hansen, and Jens Kotlarski. "Structural Health Monitoring Using Embedded Metal Filaments in Polymer Composite Piping." In ASME 2009 Pressure Vessels and Piping Conference. ASMEDC, 2009. http://dx.doi.org/10.1115/pvp2009-77983.

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Compared to conventional metal piping, fiber-reinforced polymer composite (FRPC) pipe has several attractive characteristics, among them high corrosion resistance and strength-to-weight ratio. In addition, manufacturing processes commonly employed for FRPC piping, such as filament winding, facilitate the incorporation of liner systems that are intrinsically bonded to the structural pipe body, and structural health monitoring systems. The present study investigates how metallic filaments embedded in the liner structure or the structural pipe body can be employed for structural health monitoring purposes. Using electrical induction effects a direct contact to embedded metallic filaments may not be required; information on the structural health state of liner and pipe may be obtained using excitation and sensing coils located on the outside of the pipe. In this study the feasibility of such a system was demonstrated using filament-wound FRPC tubes with embedded strain-sensitive metallic filaments.
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7

Jun, Li De. "The Research of Broken Filaments Detection Device on Viscose Filament Yarn." In 2007 International Conference on Computational Intelligence and Security Workshops (CISW 2007). IEEE, 2007. http://dx.doi.org/10.1109/cisw.2007.4425643.

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8

Buehler, Markus J., and Je´re´mie Bertaud. "Hierarchical Structure Controls Nanomechanical Properties of Vimentin Intermediate Filaments." In ASME 2010 First Global Congress on NanoEngineering for Medicine and Biology. ASMEDC, 2010. http://dx.doi.org/10.1115/nemb2010-13103.

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Intermediate filaments (often abbreviated as IFs), in addition to microtubules and microfilaments, are one of the three major components of the cytoskeleton in eukaryotic cells (Figure 1). It has been suggested that intermediate filaments are crucial in defining key mechanical functions of cells such as cell migration, cell division and mechanotransduction, and have also been referred to as the “safety belts of cells” reflecting their role in preventing exceedingly large cell stretch [1, 2]. Vimentin is a specific type of this protein filament found in fibroblasts, leukocytes, and blood vessel endothelial cells, representing the most widely distributed type of intermediate filaments. Several diseases have been linked to the structure and density of intermediate filaments. Here we report a systematic study of the effects of intermediate filaments on cell mechanics, specifically focused on changes in the density of filaments. We compare the results with experimental studies in vimentin deficient cells, showing good qualitative agreement.
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Khan, Mujibur R., Hassan Mahfuz, and Andreas Kyriacou. "Synthesis and Characterization of Low Density Polyethylene (LDPE) Reinforced With Functionalized CNTs." In ASME 2008 International Mechanical Engineering Congress and Exposition. ASMEDC, 2008. http://dx.doi.org/10.1115/imece2008-68034.

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A systematic approach was undertaken to increase strength, modulus, and toughness of low density polyethylene (LDPE) filaments through infusion of functionalized CNT and ultra high molecular weight polyethylene (UHMWPE). CNTs were functionalized with OH functional groups using chemical treatment. Functionalized CNTs and UHMWPE were first dry mixed with LDPE, and filaments were then drawn using a melt extrusion process. Loading of UHMWPE varied from 8–10 wt% while that of CNT was at 2–4 wt%. LDPE has been infused first with UHMWPE, and then with both UHMWPE and CNT, and filaments were extruded. Neat LDPE filaments were also extruded as control samples. Individual filaments from each category were tested under tension according to ASTM D3379-75. In addition, differential scanning calorimetry (DSC) and X-ray diffraction (XRD) studies were also conducted to measure changes in thermal and crystalline behavior. Filament tests have revealed that the tensile elongation of LDPE can be increased by about 200% with the addition of 10 wt% UHMWPE. This is however, is accompanied by a loss of about 50% ultimate tensile strength. In the next step, when 2 wt% CNTs and 8 wt% UHMWPE are added, tensile strength of the composite filament is restored to the level of neat LDPE (∼ 25 MPa) with an increase in modulus by 44% and in ultimate fracture strain by about 60% compared to that of neat LDPE. The source of improvement has been traced as formation of copolymer between LDPE and UHMWPE and strong interfacial interaction between the CNT and the polymers.
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10

Park, Jiyong, Byungnam Kahng, and Wonmuk Hwang. "Supramolecular Structure and Stability of the GNNQQNY β-Sheet Bilayer Filament: A Computational Study." In ASME 2007 Summer Bioengineering Conference. American Society of Mechanical Engineers, 2007. http://dx.doi.org/10.1115/sbc2007-175588.

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Self-assembly of β-sheet forming peptides into filaments has drawn great interests in biomedical applications [1,2]; Hydrogels formed by filaments self-assembled from de novo designed peptides possess potential applications for cell culture scaffolds [3]. On the other hand, peptides derived from amyloidogenic proteins in neurodegenerative diseases such as Alzheimer’s and Parkinson’s also form similar β-sheet filaments in vitro. They share little sequence homology, yet filaments formed by these self-assembling peptides commonly have the cross-β structure, the key signature of the amyloid fibril. Detailed structural information of the self-assembled β-sheet filaments has been limited partly due to the difficulty in preparing ordered filament samples, and it has been only recently that solid-state nuclear magnetic resonance and x-ray techniques have revealed their molecular structure at the atomic level [4,5]. Although molecular structures of amyloid fibrils are becoming available, physical principles governing their self-assembly and the properties of the filaments are not well-understood, for which computational as well as theoretical approaches are desirable [6].
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Reports on the topic "Filamente"

1

Farabaugh, E. N., A. Felfman, and L. Robins. Influence of Filament Geometry on Hot Filament Growth of Diamond Films. Fort Belvoir, VA: Defense Technical Information Center, February 1991. http://dx.doi.org/10.21236/ada231818.

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2

Trent, J. D., H. K. Kagawa, Takuro Yaoi, E. Olle, and N. J. Zaluzec. Chaperonin filaments: The archael cytoskeleton. Office of Scientific and Technical Information (OSTI), August 1997. http://dx.doi.org/10.2172/510354.

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3

Seki, Daikichi, Kenichi Otsuji, Takako T. Ishii, Kumi Hirose, Tomoya Iju, Satoru UeNo, Denis Cabezas, et al. SMART/SDDI Filament Disappearance Catalogue. Balkan, Black sea and Caspian sea Regional Network for Space Weather Studies, March 2020. http://dx.doi.org/10.31401/sungeo.2019.02.01.

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4

Seki, Daikichi, Kenichi Otsuji, Takako T. Ishii, Kumi Hirose, Tomoya Iju, Satoru UeNo, Denis Cabezas, et al. SMART/SDDI Filament Disappearance Catalogue. Balkan, Black sea and Caspian sea Regional Network for Space Weather Studies, March 2020. http://dx.doi.org/10.31401/sungeo.2020.02.01.

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ZUTAVERN, FRED J., ALBERT G. BACA, WENG W. CHOW, MICHAEL J. HAFICH, HAROLD P. HJALMARSON, GUILLERMO M. LOUBRIEL, ALAN MAR, MARTIN W. O'MALLEY, and GREGORY A. VAWTER. Current Filament Semiconductor Lasers (CFSL). Office of Scientific and Technical Information (OSTI), April 2001. http://dx.doi.org/10.2172/780317.

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Calini, Annalisa. Integrable Dynamics of Knotted Vortex Filaments. GIQ, 2012. http://dx.doi.org/10.7546/giq-5-2004-11-50.

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Vogt, G. J., and J. D. Katz. Microwave processing of ceramic oxide filaments. Office of Scientific and Technical Information (OSTI), May 1995. http://dx.doi.org/10.2172/105136.

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8

Eric Carlson. HIGHER EFFICIENCY FILAMENTS FOR INCANDESCENT LAMPS. Office of Scientific and Technical Information (OSTI), April 2002. http://dx.doi.org/10.2172/828972.

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9

Petviashvili, V. A filament model of MHD turbulence. Office of Scientific and Technical Information (OSTI), November 1996. http://dx.doi.org/10.2172/451196.

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Milewski, J. V., R. A. Shoultz, and M. M. Bourque-McConnell. Development of single crystal filaments. Final report. Office of Scientific and Technical Information (OSTI), April 1995. http://dx.doi.org/10.2172/39127.

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