Relevant bibliographies by topics / Particle in CelI

Contents

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

Academic literature on the topic 'Particle in CelI'

Author: Grafiati
Published: 4 June 2021
Last updated: 2 February 2022

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

Select a source type:

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

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 "Particle in CelI"

1

Han, Doo-Hee, Min-Kyung Joe, Junsu Shin, Hong-Gye Sung, and Su-Kyum Kim. "Numerical Analysis on Plasma Particles inside Electro-magnetic Field Using Particle-in-cell Method." Journal of the Korean Society for Aeronautical & Space Sciences 45, no. 11 (2017): 932–38. http://dx.doi.org/10.5139/jksas.2017.45.11.932.

Full text
APA, Harvard, Vancouver, ISO, and other styles
2

Dentler, William. "Intraflagellar transport (IFT) during assembly and disassembly of Chlamydomonas flagella." Journal of Cell Biology 170, no. 4 (2005): 649–59. http://dx.doi.org/10.1083/jcb.200412021.

Full text
Abstract:
Intraflagellar transport (IFT) of particles along flagellar microtubules is required for the assembly and maintenance of eukaryotic flagella and cilia. In Chlamydomonas, anterograde and retrograde particles viewed by light microscopy average 0.12-μm and 0.06-μm diameter, respectively. Examination of IFT particle structure in growing flagella by electron microscopy revealed similar size aggregates composed of small particles linked to each other and to the membrane and microtubules. To determine the relationship between the number of particles and flagellar length, the rate and frequency of IFT particle movement was measured in nongrowing, growing, and shortening flagella. In all flagella, anterograde and retrograde IFT averaged 1.9 μm/s and 2.7 μm/s, respectively, but retrograde IFT was significantly slower in flagella shorter than 4 μm. The number of flagellar IFT particles was not fixed, but depended on flagellar length. Pauses in IFT particle entry into flagella suggest the presence of a periodic “gate” that permits up to 4 particles/s to enter a flagellum.
APA, Harvard, Vancouver, ISO, and other styles
3

Bohrmann, J., and K. Biber. "Cytoskeleton-dependent transport of cytoplasmic particles in previtellogenic to mid-vitellogenic ovarian follicles of Drosophila: time-lapse analysis using video-enhanced contrast microscopy." Journal of Cell Science 107, no. 4 (1994): 849–58. http://dx.doi.org/10.1242/jcs.107.4.849.

Full text
Abstract:
In Drosophila oogenesis, several morphogenetic determinants and other developmental factors synthesized in the nurse cells have been shown to accumulate in the oocyte during pre- to mid-vitellogenic stages. However, the mechanisms of the involved intercellular transport processes that seem to be rather selective have not been revealed so far. We have investigated in vitro, by means of video-enhanced contrast time-lapse microscopy, the transport of cytoplasmic particles from the nurse cells through ring canals into the oocyte during oogenesis stages 6–10A. At stage 7, we first observed single particles moving into the previtellogenic oocyte. The particle transfer was strictly unidirectional and seemed to be selective, since only some individual particles moved whereas other particles lying in the vicinity of the ring canals were not transported. The observed transport processes were inhibitable with 2,4-dinitrophenol, cytochalasin B or N-ethylmaleimide, but not with microtubule inhibitors. At the beginning of vitellogenesis (stage 8), the selective translocation of particles through the ring canals became faster (up to 130 nm/second) and more frequent (about 1 particle/minute), whereas during mid-vitellogenesis (stages 9–10A) the velocity and the frequency of particle transport decreased again. Following their more or less rectilinear passage through the ring canals, the particles joined a circular stream of cytoplasmic particles in the oocyte. This ooplasmic particle streaming started at stage 6/7 with velocities of about 80 nm/second and some reversals of direction at the beginning. The particle stream in the oocyte was sensitive to colchicine and vinblastine, but not to cytochalasin B, and we presume that it reflects the rearrangement of ooplasmic microtubules described recently by other authors. We propose that during stages 7–10A, a selective transport of particles into the oocyte occurs through the ring canal along a polarized scaffold of cytoskeletal elements in which microfilaments are involved. This transport might be driven by a myosin-like motor molecule. Either attached to, or organized into, such larger particles or organelles, specific mRNAs and proteins might become selectively transported into the oocyte.
APA, Harvard, Vancouver, ISO, and other styles
4

Ince, C., J. M. Coremans, D. L. Ypey, P. C. Leijh, A. A. Verveen, and R. van Furth. "Phagocytosis by human macrophages is accompanied by changes in ionic channel currents." Journal of Cell Biology 106, no. 6 (1988): 1873–78. http://dx.doi.org/10.1083/jcb.106.6.1873.

Full text
Abstract:
The present study has shown that changes in ionic channel currents accompany the phagocytosis of particles by mononuclear phagocytes. The patch-clamp technique in the cell-attached configuration was applied to human monocyte-derived macrophages to measure the activity of single transmembrane ionic channels in intact cells. During such measurements, IgG-opsonized and non-opsonized latex particles were offered for phagocytosis under continuous video-microscopical observation. Single particles were presented to the phagocytes at a membrane location some distance from that of the patch electrode. After a lag period following particle attachment, enhanced inward and outward time-variant single channel currents coinciding with particle engulfment were observed. On the basis of current-voltage characteristics and membrane potential measurements, the outward-directed channels were identified as K+ channels. Phagocytosis was also accompanied by slow transient changes in background membrane currents, probably due to changes in the membrane potential of the phagocytosing cell. Phagocytosis of IgG-coated latex particles differed from phagocytosis of uncoated or albumin-coated particles by a shorter lag time between particle attachment and the onset of enhanced ionic channel activity.
APA, Harvard, Vancouver, ISO, and other styles
5

Kanaseki, T., Y. Ikeuchi, H. Sugiura, and T. Yamauchi. "Structural features of Ca2+/calmodulin-dependent protein kinase II revealed by electron microscopy." Journal of Cell Biology 115, no. 4 (1991): 1049–60. http://dx.doi.org/10.1083/jcb.115.4.1049.

Full text
Abstract:
The molecular conformation of Ca2+/calmodulin-dependent protein kinase II (CaM kinase II) from the rat forebrain and cerebellum was studied by means of EM using a quick-freezing technique. Each molecule appeared to be composed of two kinds of particles, with one larger central particle and smaller peripheral particles and had shapes resembling that of a flower with 8 or 10 "petals". A favorable shadowing revealed that each peripheral particle had a thin link to the central particle. We predicted that the 8-petal molecules and 10-petal molecules were octamers and decamers of CaM kinase II subunits, respectively, each assembled with the association domains of subunits gathered in the center, and the catalytic domains in the peripheral particles. Binding of antibodies to the enzyme molecules suggested that molecules with 8 and 10 peripheral particles were homopolymers composed only of beta subunit and of alpha subunit, respectively, specifying that CaM kinase II consists of homopolymer of either alpha or beta subunits.
APA, Harvard, Vancouver, ISO, and other styles
6

Ingenito, Francesco, Pierluigi Andreoli, Dimitri Batani, et al. "Directional Track Selection Technique in CR39 SSNTD for lowyield reaction experiments." EPJ Web of Conferences 167 (2018): 05006. http://dx.doi.org/10.1051/epjconf/201816705006.

Full text
Abstract:
There is a great interest in the study of p-11B aneutronic nuclear fusion reactions, both for energy production and for determination of fusion cross-sections at low energies. In this context we performed experiments at CELIA in which energetic protons, accelerated by the laser ECLIPSE, were directed toward a solid Boron target. Because of the small cross-sections at these energies the number of expected reactions is low. CR39 Solid-State Nuclear Track Detectors (SSNTD) were used to detect the alpha particles produced. Because of the low expected yield, it is difficult to discriminate the tracks due to true fusion products from those due to natural background in the CR39. To this purpose we developed a methodology of particle recognition according to their direction with respect to the detector normal, able to determine the position of their source. We applied this to the specific experiment geometry, so to select from all the tracks those due to particles coming from the region of interaction between accelerated protons and solid boron target. This technique can be of great help on the analysis of SSNTD in experiments with low yield reactions, but can be also generally applied to any experiment where particles reach the track detector with known directions, and for example to improve the detection limit of particle spectrometers using CR39.
APA, Harvard, Vancouver, ISO, and other styles
7

Niisuke, Katrin, Zsuzsanna Kuklenyik, Katalin V. Horvath, Michael S. Gardner, Christopher A. Toth, and Bela F. Asztalos. "Composition-function analysis of HDL subpopulations: influence of lipid composition on particle functionality." Journal of Lipid Research 61, no. 3 (2020): 306–15. http://dx.doi.org/10.1194/jlr.ra119000258.

Full text
Abstract:
The composition-function relationship of HDL particles and its effects on the mechanisms driving coronary heart disease (CHD) is poorly understood. We tested the hypothesis that the functionality of HDL particles is significantly influenced by their lipid composition. Using a novel 3D-separation method, we isolated five different-sized HDL subpopulations from CHD patients who had low preβ-1 functionality (low-F) (ABCA1-dependent cholesterol-efflux normalized for preβ-1 concentration) and controls who had either low-F or high preβ-1 functionality (high-F). Molecular numbers of apoA-I, apoA-II, and eight major lipid classes were determined in each subpopulation by LC-MS. The average number of lipid molecules decreased from 422 in the large spherical α-1 particles to 57 in the small discoid preβ-1 particles. With decreasing particle size, the relative concentration of free cholesterol (FC) decreased in α-mobility but not in preβ-1 particles. Preβ-1 particles contained more lipids than predicted; 30% of which were neutral lipids (cholesteryl ester and triglyceride), indicating that these particles were mainly remodeled from larger particles not newly synthesized. There were significant correlations between HDL-particle functionality and the concentrations of several lipids. Unexpectedly, the phospholipid:FC ratio was significantly correlated with large-HDL-particle functionality but not with preβ-1 functionality. There was significant positive correlation between particle functionality and total lipids in high-F controls, indicating that the lipid-binding capacity of apoA-I plays a major role in the cholesterol efflux capacity of HDL particles. Functionality and lipid composition of HDL particles are significantly correlated and probably both are influenced by the lipid-binding capacity of apoA-I.
APA, Harvard, Vancouver, ISO, and other styles
8

Bovia, F., and K. Strub. "The signal recognition particle and related small cytoplasmic ribonucleoprotein particles." Journal of Cell Science 109, no. 11 (1996): 2601–8. http://dx.doi.org/10.1242/jcs.109.11.2601.

Full text
Abstract:
Recently, a number of novel small cytoplasmic ribonucleoprotein particles have been identified that comprise RNA and protein subunits related to the signal recognition particle (SRP). Here we discuss the latest results on the structure and functions of SRP together with the structures and putative functions of the novel SRP-related ribonucleoprotein particles.
APA, Harvard, Vancouver, ISO, and other styles
9

Wada, Yuuko, Toshikazu Hamasaki, and Peter Satir. "Evidence for a Novel Affinity Mechanism of Motor-assisted Transport Along Microtubules." Molecular Biology of the Cell 11, no. 1 (2000): 161–69. http://dx.doi.org/10.1091/mbc.11.1.161.

Full text
Abstract:
In microtubule (MT) translocation assays, using colloidal gold particles coupled to monoclonal tubulin antibodies to mark positions along MTs, we found that relative motion is possible between the gold particle and an MT, gliding on dynein or kinesin. Such motion evidently occurred by an affinity release and rebinding mechanism that did not require motor activity on the particle. As the MTs moved, particles drifted to the trailing edge of the MT and then were released. Sometimes the particles transferred from one MT to another, moving orthogonally. Although motion of the particles was uniformly rearward, movement was toward the (−) or (+) end of the MT, depending on whether dynein or kinesin, respectively, was used in the assay. These results open possibilities for physiological mechanisms of organelle and other movement that, although dependent on motor-driven microtubule transport, do not require direct motor attachment between the organelle and the microtubule. Our observations on the direction of particle drift and time of release may also provide confirmation in a dynamic system for the conclusion that β tubulin is exposed at the (+) end of the MT.
APA, Harvard, Vancouver, ISO, and other styles
10

Morrissette, N. S., J. M. Murray, and D. S. Roos. "Subpellicular microtubules associate with an intramembranous particle lattice in the protozoan parasite Toxoplasma gondii." Journal of Cell Science 110, no. 1 (1997): 35–42. http://dx.doi.org/10.1242/jcs.110.1.35.

Full text
Abstract:
Application of Fourier analysis techniques to images of isolated, frozen-hydrated subpellicular microtubules from the protozoan parasite Toxoplasma gondii demonstrates a distinctive 32 nm periodicity along the length of the microtubules. A 32 nm longitudinal repeat is also observed in the double rows of intramembranous particles seen in freeze-fracture images of the parasite's pellicle; these rows are thought to overlie the subpellicular microtubules. Remarkably, the 32 nm intramembranous particle periodicity is carried over laterally to the single rows of particles that lie between the microtubule-associated double rows. This creates a two-dimensional particle lattice, with the second dimension at an angle of approximately 75 degrees to the longitudinal rows (depending on position along the length of the parasite). Drugs that disrupt known cytoskeletal components fail to destroy the integrity of the particle lattice. This intramembranous particle organization suggests the existence of multiple cytoskeletal filaments of unknown identity. Filaments associated with the particle lattice provide a possible mechanism for motility and shape change in Toxoplasma: distortion of the lattice may mediate the twirling motility seen upon host-cell lysis, and morphological changes observed during invasion.
APA, Harvard, Vancouver, ISO, and other styles
More sources

Dissertations / Theses on the topic "Particle in CelI"

1

Rassou, Sébastien. "Accélération d'électrons par onde de sillage laser : Développement d’un modèle analytique étendu au cas d’un plasma magnétisé dans le régime du Blowout." Thesis, Université Paris-Saclay (ComUE), 2015. http://www.theses.fr/2015SACLS066/document.

Full text
Abstract:
Une impulsion laser intense se propageant dans un plasma sous-dense (ne&lt; 10¹⁸ W.cm⁻²) et de durée très courte (τ₀&lt; 100 fs), , on atteint le régime de la bulle. Les champs électriques dans ces bulles, de l’ordre de 100 GV/m, peuvent accélérer un faisceau d’électrons jusqu’au GeV sur des distances de l’ordre du centimètre. Dans ce régime, les électrons expulsés par la force pondéromotrice du laser forment une fine et dense couche à la surface d'une cavité d'ions restés immobiles. Les propriétés de ce régime sont examinées par l’intermédiaire d’un modèle analytique, que nous avons développé en nous inspirant du travail de W. Lu et S. Yi. En nous plaçant dans ce régime prometteur, nous avons étudié les mécanismes d’injection et de piégeage dans l'onde de sillage. Dans l’injection optique, les polarisations parallèles ou circulaires positives conduisent respectivement à une injection mettant en jeu du chauffage stochastique, ou à l’injection froide. Un paramètre de similarité est introduit, celui-ci permet de déterminer la méthode d’injection la plus appropriée pour maximiser la charge injectée. Enfin, le modèle analytique présenté en première partie est étendu afin d’étudier l’onde de sillage dans le régime de la bulle lorsqu’un champ magnétique longitudinal initial est appliqué au plasma. Lorsque le plasma est magnétisé deux phénomènes remarquables se manifestent, d'une part une ouverture apparaît à l'arrière de la bulle et d'autre part un mécanisme d'amplification du champ magnétique longitudinale est induit par la variation du flux magnétique. Les prédictions de notre modèle analytique sont confrontées aux résultats de simulations PIC 3D issues du code CALDER-Circ. La conséquence immédiate de la déformation de l'onde de sillage est la réduction, voire la suppression de l'auto-injection. L’application d’un champ magnétique longitudinal, combinée à un choix judicieux des paramètres laser-plasma, permet de réduire la dispersion en énergie des faisceaux d’électrons produits après injection optique<br>An intense laser pulse propagating in an under dense plasma (ne&lt; 10¹⁸ W.cm⁻²) and short(τ₀&lt; 100 fs), the bubble regime is reached. Within the bubble the electric field can exceed 100 GV/m and a trapped electron beam is accelerated to GeV energy with few centimetres of plasma.In this regime, the electrons expelled by the laser ponderomotive force are brought back and form a dense sheath layer. First, an analytic model was derived using W. Lu and S. Yi formalisms in order to investigate the properties of the wakefield in the blowout regime. In a second part, the trapping and injection mechanisms into the wakefield were studied. When the optical injection scheme is used, electrons may undergo stochastic heating or cold injection depending on the lasers’ polarisations. A similarity parameter was introduced to find out the most appropriate method to maximise the trapped charge. In a third part, our analytic model is extended to investigate the influence of an initially applied longitudinal magnetic field on the laser wakefield in the bubble regime. When the plasma is magnetized two remarkable phenomena occur. Firstly the bubble is opened at its rear, and secondly the longitudinal magnetic field is amplified - at the rear of the bubble - due to the azimuthal current induced by the variation of the magnetic flux. The predictions of our analytic model were shown to be in agreement with 3D PIC simulation results obtained with Calder-Circ. In most situations the wake shape is altered and self-injection can be reduced or even cancelled by the applied magnetic field. However, the application of a longitudinal magnetic field, combined with a careful choice of laser-plasma parameters, reduces the energy spread of the electron beam produced after optical injection
APA, Harvard, Vancouver, ISO, and other styles
2

Lindemann, Dirk, Kristin Stirnnagel, Daniel Lüftenegger, et al. "Analysis of Prototype Foamy Virus particle-host cell interaction with autofluorescent retroviral particles." BMC, 2010. https://tud.qucosa.de/id/qucosa%3A28868.

Full text
Abstract:
Background The foamy virus (FV) replication cycle displays several unique features, which set them apart from orthoretroviruses. First, like other B/D type orthoretroviruses, FV capsids preassemble at the centrosome, but more similar to hepadnaviruses, FV budding is strictly dependent on cognate viral glycoprotein coexpression. Second, the unusually broad host range of FV is thought to be due to use of a very common entry receptor present on host cell plasma membranes, because all cell lines tested in vitro so far are permissive. Results In order to take advantage of modern fluorescent microscopy techniques to study FV replication, we have created FV Gag proteins bearing a variety of protein tags and evaluated these for their ability to support various steps of FV replication. Addition of even small N-terminal HA-tags to FV Gag severely impaired FV particle release. For example, release was completely abrogated by an N-terminal autofluorescent protein (AFP) fusion, despite apparently normal intracellular capsid assembly. In contrast, C-terminal Gag-tags had only minor effects on particle assembly, egress and particle morphogenesis. The infectivity of C-terminal capsid-tagged FV vector particles was reduced up to 100-fold in comparison to wild type; however, infectivity was rescued by coexpression of wild type Gag and assembly of mixed particles. Specific dose-dependent binding of fluorescent FV particles to target cells was demonstrated in an Env-dependent manner, but not binding to target cell-extracted- or synthetic- lipids. Screening of target cells of various origins resulted in the identification of two cell lines, a human erythroid precursor- and a zebrafish- cell line, resistant to FV Env-mediated FV- and HIV-vector transduction. Conclusions We have established functional, autofluorescent foamy viral particles as a valuable new tool to study FV - host cell interactions using modern fluorescent imaging techniques. Furthermore, we succeeded for the first time in identifying two cell lines resistant to Prototype Foamy Virus Env-mediated gene transfer. Interestingly, both cell lines still displayed FV Env-dependent attachment of fluorescent retroviral particles, implying a post-binding block potentially due to lack of putative FV entry cofactors. These cell lines might ultimately lead to the identification of the currently unknown ubiquitous cellular entry receptor(s) of FVs.
APA, Harvard, Vancouver, ISO, and other styles
3

Lindemann, Dirk, Kristin Stirnnagel, Daniel Lüftenegger, et al. "Analysis of Prototype Foamy Virus particle-host cell interaction with autofluorescent retroviral particles." Saechsische Landesbibliothek- Staats- und Universitaetsbibliothek Dresden, 2015. http://nbn-resolving.de/urn:nbn:de:bsz:14-qucosa-176566.

Full text
Abstract:
Background The foamy virus (FV) replication cycle displays several unique features, which set them apart from orthoretroviruses. First, like other B/D type orthoretroviruses, FV capsids preassemble at the centrosome, but more similar to hepadnaviruses, FV budding is strictly dependent on cognate viral glycoprotein coexpression. Second, the unusually broad host range of FV is thought to be due to use of a very common entry receptor present on host cell plasma membranes, because all cell lines tested in vitro so far are permissive. Results In order to take advantage of modern fluorescent microscopy techniques to study FV replication, we have created FV Gag proteins bearing a variety of protein tags and evaluated these for their ability to support various steps of FV replication. Addition of even small N-terminal HA-tags to FV Gag severely impaired FV particle release. For example, release was completely abrogated by an N-terminal autofluorescent protein (AFP) fusion, despite apparently normal intracellular capsid assembly. In contrast, C-terminal Gag-tags had only minor effects on particle assembly, egress and particle morphogenesis. The infectivity of C-terminal capsid-tagged FV vector particles was reduced up to 100-fold in comparison to wild type; however, infectivity was rescued by coexpression of wild type Gag and assembly of mixed particles. Specific dose-dependent binding of fluorescent FV particles to target cells was demonstrated in an Env-dependent manner, but not binding to target cell-extracted- or synthetic- lipids. Screening of target cells of various origins resulted in the identification of two cell lines, a human erythroid precursor- and a zebrafish- cell line, resistant to FV Env-mediated FV- and HIV-vector transduction. Conclusions We have established functional, autofluorescent foamy viral particles as a valuable new tool to study FV - host cell interactions using modern fluorescent imaging techniques. Furthermore, we succeeded for the first time in identifying two cell lines resistant to Prototype Foamy Virus Env-mediated gene transfer. Interestingly, both cell lines still displayed FV Env-dependent attachment of fluorescent retroviral particles, implying a post-binding block potentially due to lack of putative FV entry cofactors. These cell lines might ultimately lead to the identification of the currently unknown ubiquitous cellular entry receptor(s) of FVs.
APA, Harvard, Vancouver, ISO, and other styles
4

Mack, Stuart Anderson. "Experimental and computational study of the behaviour of free-cells in discharging silos." Thesis, University of Manchester, 2011. https://www.research.manchester.ac.uk/portal/en/theses/experimental-and-computational-study-of-the-behaviour-of-freecells-in-discharging-silos(1f0b6130-7c2c-4a96-ad56-54ff71af2e98).html.

Full text
Abstract:
This study aims to deduce an appropriate shape and density for an electronic free-cell that could be placed into a silo so that position and other desired physical parameters could be recorded. To determine how density and shape affects the trajectory and displacement of free cells, the trajectory and displacement of cylindrical, cuboid and triangular prism free-cells of equivalent volume was investigated in a discharging quasi 3D silo slice. The free-cells were placed at twelve different starting positions spread evenly over one half of the 3D slice. Tests were conducted using a monosized batch of spherical particles with a diameter of approximately 5 mm. Tests were also conducted in a binary mixture consisting of particles of different sizes (5 mm/4 mm) and the same density (1.28 g/cm3) and a binary mixture consisting of particles of different size (6 mm/5 mm) and different densities (1.16 g/cm3/1.28 g/cm3).The rotation of the free cells was also briefly discussed.Computer simulations were conducted using the Discrete Element Method (DEM). The simulation employed the spring-slider-dashpot contact model to represent the normal and tangential force components and the modified Euler integration scheme was applied to calculate the particle velocities and positions at each time step. One trial of each of the metal and plastic, cylindrical, cuboid and triangular prism free cells was compared with the average of three experimental trials. The trajectory and displacement of a representative particle positioned at the same starting position as the free cell was also obtained from DEM simulation and compared with the path and displacement of each of the free cells to determine which free cell followed the particle most closely and hence to determine a suitable free cell that would move with the rest of the grains. Spherical particles are idealised particles. Therefore tests were also conducted with a small number of polyhedral particles, to deduce their flow rate and the critical orifice width at which blockages were likely to form. Simulations were also conducted to test the feasibility of the DEM in modelling the behaviour of these polyhedral particles.Results indicate that for a free cell to move along the same trajectory and have the same displacement and velocity as an equivalent particle in the batch it should have a similar density to the majority of the other particles. A cylindrical free cell of similar density to the particles was found to follow the path of the representative particle more closely than the cuboid or triangular prism. Polyhedral particles were found to have a greater flow rate than spherical particles of equivalent volume.
APA, Harvard, Vancouver, ISO, and other styles
5

Stamm, Matthew T. "Particle Dynamics and Particle-Cell Interaction in Microfluidic Systems." Diss., The University of Arizona, 2013. http://hdl.handle.net/10150/308886.

Full text
Abstract:
Particle-laden flow in a microchannel resulting in aggregation of microparticles was investigated to determine the dependence of the cluster growth rate on the following parameters: suspension void fraction, shear strain rate, and channel-height to particle-diameter ratio. The growth rate of an average cluster was found to increase linearly with suspension void fraction, and to obey a power-law relationships with shear strain rate as S^0.9 and channel-height to particle-diameter ratio as (h/d)^-3.5. Ceramic liposomal nanoparticles and silica microparticles were functionalized with antibodies that act as targeting ligands. The bio-functionality and physical integrity of the cerasomes were characterized. Surface functionalization allows cerasomes to deliver drugs with selectivity and specificity that is not possible using standard liposomes. The functionalized particle-target cell binding process was characterized using BT-20 breast cancer cells. Two microfluidic systems were used; one with both species in suspension, the other with cells immobilized inside a microchannel and particle suspension as the mobile phase. Effects of incubation time, particle concentration, and shear strain rate on particle-cell binding were investigated. With both species in suspension, the particle-cell binding process was found to be reasonably well-described by a first-order model. Particle desorption and cellular loss of binding affinity in time were found to be negligible; cell-particle-cell interaction was identified as the limiting mechanism in particle-cell binding. Findings suggest that separation of a bound particle from a cell may be detrimental to cellular binding affinity. Cell-particle-cell interactions were prevented by immobilizing cells inside a microchannel. The initial stage of particle-cell binding was investigated and was again found to be reasonably well-described by a first-order model. For both systems, the time constant was found to be inversely proportional to particle concentration. The second system revealed the time constant to obey a power-law relationship with shear strain rate as τ∝S^.37±.06. Under appropriate scaling, the behavior displayed in both systems is well-described by the same exponential curve. Identification of the appropriate scaling parameters allows for extrapolation and requires only two empirical values. This could provide a major head-start in any dosage optimization studies.
APA, Harvard, Vancouver, ISO, and other styles
6

Pachler, Klaus, Thomas Frank, and Klaus Bernert. "Simulation of Unsteady Gas-Particle Flows including Two-way and Four-way Coupling on a MIMD Computer Architectur." Universitätsbibliothek Chemnitz, 2002. http://nbn-resolving.de/urn:nbn:de:bsz:ch1-200200352.

Full text
Abstract:
The transport or the separation of solid particles or droplets suspended in a fluid flow is a common task in mechanical and process engineering. To improve machinery and physical processes (e.g. for coal combustion, reduction of NO_x and soot) an optimization of complex phenomena by simulation applying the fundamental conservation equations is required. Fluid-particle flows are characterized by the ratio of density of the two phases gamma=rho_P/rho_F, by the Stokes number St=tau_P/tau_F and by the loading in terms of void and mass fraction. Those numbers (Stokes number, gamma) define the flow regime and which relevant forces are acting on the particle. Dependent on the geometrical configuration the particle-wall interaction might have a heavy impact on the mean flow structure. The occurrence of particle-particle collisions becomes also more and more important with the increase of the local void fraction of the particulate phase. With increase of the particle loading the interaction with the fluid phase can not been neglected and 2-way or even 4-way coupling between the continous and disperse phases has to be taken into account. For dilute to moderate dense particle flows the Euler-Lagrange method is capable to resolve the main flow mechanism. An accurate computation needs unfortunately a high number of numerical particles (1,...,10^7) to get the reliable statistics for the underlying modelling correlations. Due to the fact that a Lagrangian algorithm cannot be vectorized for complex meshes the only way to finish those simulations in a reasonable time is the parallization applying the message passing paradigma. Frank et al. describes the basic ideas for a parallel Eulererian-Lagrangian solver, which uses multigrid for acceleration of the flow equations. The performance figures are quite good, though only steady problems are tackled. The presented paper is aimed to the numerical prediction of time-dependend fluid-particle flows using the simultanous particle tracking approach based on the Eulerian-Lagrangian and the particle-source-in-cell (PSI-Cell) approach. It is shown in the paper that for the unsteady flow prediction efficiency and load balancing of the parallel numerical simulation is an even more pronounced problem in comparison with the steady flow calculations, because the time steps for the time integration along one particle trajectory are very small per one time step of fluid flow integration and so the floating point workload on a single processor node is usualy rather low. Much time is spent for communication and waiting time of the processors, because for cold flow particle convection not very extensive calculations are necessary. One remedy might be a highspeed switch like Myrinet or Dolphin PCI/SCI (500 MByte/s), which could balance the relative high floating point performance of INTEL PIII processors and the weak capacity of the Fast-Ethernet communication network (100 Mbit/s) of the Chemnitz Linux Cluster (CLIC) used for the presented calculations. Corresponding to the discussed examples calculation times and parallel performance will be presented. Another point is the communication of many small packages, which should be summed up to bigger messages, because each message requires a startup time independently of its size. Summarising the potential of such a parallel algorithm, it will be shown that a Beowulf-type cluster computer is a highly competitve alternative to the classical main frame computer for the investigated Eulerian-Lagrangian simultanous particle tracking approach.
APA, Harvard, Vancouver, ISO, and other styles
7

Ljung, Patric. "Visualization of Particle In Cell Simulations." Thesis, Linköping University, Department of Science and Technology, 2000. http://urn.kb.se/resolve?urn=urn:nbn:se:liu:diva-2340.

Full text
Abstract:
<p>A numerical simulation case involving space plasma and the evolution of instabilities that generates very fast electrons, i.e. approximately at half of the speed of light, is used as a test bed for scientific visualisation techniques. A visualisation system was developed to provide interactive real-time animation and visualisation of the simulation results. The work focuses on two themes and the integration of them. The first theme is the storage and management of the large data sets produced. The second theme deals with how the Visualisation System and Visual Objects are tailored to efficiently visualise the data at hand. </p><p>The integration of the themes has resulted in an interactive real-time animation and visualisation system which constitutes a very powerful tool for analysis and understanding of the plasma physics processes. The visualisations contained in this work have spawned many new possible research projects and provided insight into previously not fully understood plasma physics phenomena.</p>
APA, Harvard, Vancouver, ISO, and other styles
8

Tatomirescu, Emilian-Dragos. "Accélération laser-plasma à ultra haute intensité - modélisation numérique." Thesis, Bordeaux, 2019. http://www.theses.fr/2019BORD0013/document.

Full text
Abstract:
Avec les dernières augmentations de l'intensité maximale de laser réalisable grâce à de courtes impulsions à haute puissance (gamme femtoseconde) un intérêt a surgi dans les sources de plasma laser potentiels. Les lasers sont utilisés en radiographie proton, allumage rapide, hadronthérapie, la production de radioisotopes et de laboratoire astrophysique. Au cours de l'interaction laser-cible, les ions sont accélérés par des processus physiques différents, en fonction de la zone de la cible. Tous ces mécanismes ont un point commun: les ions sont accélérés par des champs électriques intenses, qui se produisent en raison de la séparation de forte charge induite par l'interaction de l'impulsion laser avec la cible, directement ou indirectement. Deux principales sources distinctes pour le déplacement de charge peuvent être mis en évidence. Le premier est le gradient de charge provoquée par l'action directe de la force ponderomotive de laser sur les électrons dans la surface avant de la cible, qui est la prémisse pour le processus d'accélération des radiations de pression (RPA). Une deuxième source peut être identifiée comme provenant du rayonnement laser qui est transformée en énergie cinétique d'une population d'électrons relativistes chaud (~ quelques MeV). Les électrons chauds se déplacent et font recirculer à travers la cible et forment un nuage d'électrons relativistes à la sortie de la cible dans le vide. Ce nuage, qui se prolonge pour plusieurs longueurs de Debye, crée un champ électrique extrêmement intense longitudinal, la plupart du temps dirigé le long de la surface normale, ce qui, par conséquent, est la cause de l'accélération d'ions efficace, qui conduit à l'accélération cible normale gaine (TNSA) processus . Le mécanisme TNSA permet d'utiliser des géométries différentes cibles afin de parvenir à une meilleure focalisation des faisceaux de particules de l'ordre de plusieurs dizaines de microns, avec des densités d'énergie élevées. Les électrons chauds sont produits par l'irradiation d'une feuille solide avec une impulsion laser intense; ces électrons sont transportés à travers la cible, la formation d'un champ électrostatique fort, normal à la surface cible. Protons et les ions chargés positivement de la surface arrière de la cible sont accélérés par ce domaine jusqu'à ce que la charge de l'électron est compensée. La densité d'électrons chauds et la température dans le vide arrière dépendent des propriétés géométriques et de composition cibles tels que la courbure de la cible, les structures de mise au point d'impulsion et de microstructure pour l'accélération de protons améliorée. Au cours de ma première année, j'ai étudié les effets de la géométrie de la cible sur le proton et l'ion énergie et la distribution angulaire afin d'optimiser les faisceaux de particules laser accéléré au moyen de deux dimensions (2D) particule-in-cell (PIC) simulations de l'interaction de l'ultra-court impulsions laser avec plusieurs cibles microstructurées. Également au cours de cette année, je l'ai étudié la théorie derrière les modèles utilisés<br>With the latest increases in maximum laser intensity achievable through short pulses at high power (femtosecond range) an interest has arisen in potential laser plasma sources. Lasers are used in proton radiography, rapid ignition, hadrontherapy, production of radioisotopes and astrophysical laboratory. During the laser-target interaction, the ions are accelerated by different physical processes, depending on the area of ​​the target. All these mechanisms have one thing in common: the ions are accelerated by intense electric fields, which occur due to the separation of high charge induced by the interaction of the laser pulse with the target, directly or indirectly. Two main distinct sources for charge displacement can be identified. The first is the charge gradient caused by the direct action of the laser ponderomotive force on the electrons in the front surface of the target, which is the premise for the pressure ramping acceleration (RPA) process. A second source can be identified as coming from the laser radiation which is transformed into kinetic energy of a hot relativistic electron population (~ a few MeV). The hot electrons move and recirculate through the target and form a cloud of relativistic electrons at the exit of the target in a vacuum. This cloud, which extends for several lengths of Debye, creates an extremely intense longitudinal electric field, mostly directed along the normal surface, which is therefore the cause of effective ion acceleration, which leads to the normal target sheath acceleration (TNSA) process. The TNSA mechanism makes it possible to use different target geometries in order to obtain a better focusing of the beams of particles on the order of several tens of microns, with high energy densities. Hot electrons are produced by irradiating a solid sheet with an intense laser pulse; these electrons are transported through the target, forming a strong electrostatic field, normal to the target surface. Protons and positively charged ions from the back surface of the target are accelerated by this domain until the charge of the electron is compensated. The density of hot electrons and the temperature in the back vacuum depend on the target geometric and compositional properties such as target curvature, pulse and microstructure tuning structures for enhanced proton acceleration. In my first year I studied the effects of target geometry on the proton and energy ion and angular distribution in order to optimize the accelerated laser particle beams by means of two-dimensional (2D) particle -in-cell (PIC) simulations of the interaction of ultra-short laser pulses with several microstructured targets. Also during this year, I studied the theory behind the models used
APA, Harvard, Vancouver, ISO, and other styles
9

Przebinda, Viktor. "Vertical optimization of particle in cell simulation." Diss., Connect to online resource, 2005. http://wwwlib.umi.com/cr/colorado/fullcit?p1425790.

Full text
APA, Harvard, Vancouver, ISO, and other styles
10

Edwards, Essex. "A high-order accurate particle-in-cell method." Thesis, University of British Columbia, 2010. http://hdl.handle.net/2429/26106.

Full text
Abstract:
We propose the use of high-order accurate interpolation and approximation schemes alongside high-order accurate time integration methods to enable high-order accurate Particle-in-Cell methods. The key insight is to view the unstructured set of particles as the underlying representation of the continuous fields; the grid used to evaluate integro-differential coupling terms is purely auxiliary. We also include a novel regularization term to avoid the accumulation of noise in the particle samples without harming the convergence rate. We include numerical examples for several model problems: advection-diffusion, shallow water, and incompressible Navier-Stokes in vorticity formulation. The implementation demonstrates fourth-order convergence, shows very low numerical dissipation, and is competitive with high-order accurate Eulerian schemes.
APA, Harvard, Vancouver, ISO, and other styles
More sources

Books on the topic "Particle in CelI"

1

MacNeice, Peter. Particle-mesh techniques. Goddard Space Flight Center, 1995.

Find full text
APA, Harvard, Vancouver, ISO, and other styles
2

Birch, Paul Colin. Particle-in-cell simulations of the lunar wake. typescript, 2001.

Find full text
APA, Harvard, Vancouver, ISO, and other styles
3

Bahmani-Makvandzadeh, M. Controlled particle desposition in a reticulated vitreous carbon electrochemical adsorption cell. UMIST, 1996.

Find full text
APA, Harvard, Vancouver, ISO, and other styles
4

Rantamäki, Karin. Particle-in-cell simulations of the near-field of a lower hybrid grill. VTT Technical Research Centre of Finland, 2003.

Find full text
APA, Harvard, Vancouver, ISO, and other styles
5

Gaier, James R. Effect of particle size of Martian dust on the degradation of photovoltaic cell performance. National Aeronautics and Space Administration, 1991.

Find full text
APA, Harvard, Vancouver, ISO, and other styles
6

Chen, Maozhang. Numerical simulation of Tollmien-Schlichting waves by use of a modified vortex particle-in-cell method. Imperial College of Science and Technology, Dept. of Aeronautics, 1985.

Find full text
APA, Harvard, Vancouver, ISO, and other styles
7

Dieckmann, Mark Eric. A survey of elementary plasma instabilities and ECH wave noise properties relevant to plasma sounding by means of particle in cell simulations. typescript, 1999.

Find full text
APA, Harvard, Vancouver, ISO, and other styles
8

Partition of cell particles and macromolecules: Separation and purification of biomolecules, cell organelles, membranes, and cells in aqueous polymer two-phase systems and their use in biochemical analysis and biotechnology. 3rd ed. Wiley, 1986.

Find full text
APA, Harvard, Vancouver, ISO, and other styles
9

Siersma, D. New Developments in Singularity Theory. Springer Netherlands, 2001.

Find full text
APA, Harvard, Vancouver, ISO, and other styles
10

Gil, Juan. Aspects of Boundary Problems in Analysis and Geometry. Birkhäuser Basel, 2004.

Find full text
APA, Harvard, Vancouver, ISO, and other styles
More sources

Book chapters on the topic "Particle in CelI"

1

Galbraith, D. W. "Large Particle Sorting." In Flow Cytometry and Cell Sorting. Springer Berlin Heidelberg, 1992. http://dx.doi.org/10.1007/978-3-662-02785-1_21.

Full text
APA, Harvard, Vancouver, ISO, and other styles
2

Galbraith, David W., and Sergio Lucretti. "Large Particle Sorting." In Flow Cytometry and Cell Sorting. Springer Berlin Heidelberg, 2000. http://dx.doi.org/10.1007/978-3-662-04129-1_25.

Full text
APA, Harvard, Vancouver, ISO, and other styles
3

Lehnert, Bruce E. "CHAPTER 14. DEFENSE MECHANISMS AGAINST INHALED PARTICLES AND ASSOCIATED PARTICLE-CELL INTERACTIONS." In Health Effects of Mineral Dusts, edited by George D. Guthrie and Brooke T. Mossman. De Gruyter, 1993. http://dx.doi.org/10.1515/9781501509711-017.

Full text
APA, Harvard, Vancouver, ISO, and other styles
4

Cui, Wanzhao, Yun Li, Hongtai Zhang, and Jing Yang. "Electromagnetic Particle-in-Cell Method." In Simulation Method of Multipactor and Its Application in Satellite Microwave Components. CRC Press, 2021. http://dx.doi.org/10.1201/9781003189794-3.

Full text
APA, Harvard, Vancouver, ISO, and other styles
5

DeLong, E. F. "Molecular Systematics, Microbial Ecology and Single Cell Analysis." In Particle Analysis in Oceanography. Springer Berlin Heidelberg, 1991. http://dx.doi.org/10.1007/978-3-642-75121-9_10.

Full text
APA, Harvard, Vancouver, ISO, and other styles
6

Henzler, Hans-Jürgen. "Particle Stress in Bioreactors." In Influence of Stress on Cell Growth and Product Formation. Springer Berlin Heidelberg, 2000. http://dx.doi.org/10.1007/3-540-47865-5_2.

Full text
APA, Harvard, Vancouver, ISO, and other styles
7

Falkowski, P. G., S. Demers, and L. Legendre. "Concluding Remarks: Promises and Limitations of Individual Cell and Particle Analysis." In Particle Analysis in Oceanography. Springer Berlin Heidelberg, 1991. http://dx.doi.org/10.1007/978-3-642-75121-9_16.

Full text
APA, Harvard, Vancouver, ISO, and other styles
8

Bowman, Clark, Karen Larson, Alexander Roitershtein, Derek Stein, and Anastasios Matzavinos. "Bayesian Uncertainty Quantification for Particle-Based Simulation of Lipid Bilayer Membranes." In Cell Movement. Springer International Publishing, 2018. http://dx.doi.org/10.1007/978-3-319-96842-1_4.

Full text
APA, Harvard, Vancouver, ISO, and other styles
9

Robinson, Alex P. L. "Particle-in-Cell and Hybrid Simulation." In Laser-Plasma Interactions and Applications. Springer International Publishing, 2013. http://dx.doi.org/10.1007/978-3-319-00038-1_15.

Full text
APA, Harvard, Vancouver, ISO, and other styles
10

Andreoni, C. "Immunomagnetic Particles for Cell Isolation." In Flow Cytometry. Springer Berlin Heidelberg, 1993. http://dx.doi.org/10.1007/978-3-642-84616-8_29.

Full text
APA, Harvard, Vancouver, ISO, and other styles

Conference papers on the topic "Particle in CelI"

1

Li, Youlan, Colin Dalton, Humud Said, and Karan V. I. S. Kaler. "An Integrated Microfluidic Dielectrophoretic (DEP) Cell Fractionation System." In ASME 3rd International Conference on Microchannels and Minichannels. ASMEDC, 2005. http://dx.doi.org/10.1115/icmm2005-75062.

Full text
Abstract:
In this article we report on a planar miniaturized dielectrophoretic (DEP) microfluidic device developed for the purpose of continuous fractionation and purification of sample suspensions of microscopic particles or biological cells, employing specially shaped nonuniform (isomotive) electric fields. The device integrates three fully functional and distinct sub-units consisting of 1) sheath and sample injection ports, arranged to achieve hydrodynamic focusing of the cell stream; 2) the DEP fractionation region and 3) two sample collection ports. In the DEP fractionation region, the magnitude of the field induced DEP force acting on the particle is essentially constant and independent of the particle’s position and furthermore only dependent on the intrinsic polarization response of the particle, for identical sized particles. The operation and performance in terms of sample throughput, separation efficiency and repeatability of the device was evaluated using test microscopic sized dielectric particles and biological particles, including cancerous cell lines.
APA, Harvard, Vancouver, ISO, and other styles
2

Sakaki, Hiroto, Akiko Kaneko, Yutaka Abe, and Masatoshi Ike. "Study on the New Fine Particle Size Measurement Technique With Laser Interference Fringes." In ASME-JSME-KSME 2011 Joint Fluids Engineering Conference. ASMEDC, 2011. http://dx.doi.org/10.1115/ajk2011-11018.

Full text
Abstract:
We propose one fine partice size measurement technique with laser interference fringes which is expected to achieve both non-contact and in-line measurement of the diameter of several hundred nano meter particles. However, the principle of this measurement technique with laser interference fringes is not clear and applicability of fine particle size measurement is unclear. The objective of this study is to examine the principle of this measurement technique with laser interference fringes and evaluate its applicability. We measure the flow structure in a flow cell which is the test section with Particle Image Velocimetry (PIV) to optimize the setting of the flow cell in the measurement system. From the velocity profile along the flow cell, 20 mm downward from the inlet is set as the measurement point. Next, we visualize the laser interference fringes formed with a high-speed video camera to identify the appearance and the behavior of the laser interference fringes through fine particles in the flow cell. Finally, we measure both the time variation of the intensity of the laser interference fringes and the intensity of the scattering light with photodiodes. Passage time of a particle in the laser beam and the voltage intensity have correlation each other. The effect of particle sizes on the laser signal is discussed.
APA, Harvard, Vancouver, ISO, and other styles
3

Fard, F. N., B. McLaury, and S. Shirazi. "Effect of Cell Size on Particle-Eddy Interaction and Erosion Predictions Using Commercial CFD Software (FLUENT)." In ASME 2012 Fluids Engineering Division Summer Meeting collocated with the ASME 2012 Heat Transfer Summer Conference and the ASME 2012 10th International Conference on Nanochannels, Microchannels, and Minichannels. American Society of Mechanical Engineers, 2012. http://dx.doi.org/10.1115/fedsm2012-72294.

Full text
Abstract:
Some commercial CFD codes have the ability to predict erosion. For low concentration flows, a one-way coupling approach is used. The flow solution is determined then thousands of particle trajectories are determined using a Lagrangian approach, and the particle impact information is used in an erosion equation to predict the erosion. It is necessary practice to insure grid independence for the flow solution; however, discussion of the effect of grid size on particle tracking is not common. In this paper, the effect of cell size on particle tracking and erosion modeling is studied using a commercial computational fluid dynamics (CFD) code, FLUENT. Two surprising issues were found during detailed investigation of CFD results. First, eddy size is limited by cell size in FLUENT, which affects particle-eddy interaction in the discrete phase model and consequently erosion modeling. Limiting the eddy size based on the cell size can have a huge effect on the particle trajectories in geometries like sudden contraction/expansions since eddies play an important role in particle behavior in these geometries. This is particularly true for very small particles and when liquid is the carrier fluid. Second, the particle impact behavior seems unrealistic. Particles tend to stay near the wall and impact the wall over and over in a small area. During each impact series, the particle’s impact velocities do not reduce with successive impacts as expected. This promotes simulated erosion rates that are high. In addition to the CFD investigation, an experimental facility was designed and built to develop erosion equations for small particles (average size of 25 μm) to enable more appropriate comparisons of erosion data with predicted erosion.
APA, Harvard, Vancouver, ISO, and other styles
4

Yuan, Chen, Zhenhai Pan, and Huiying Wu. "Numerical Investigation on the Dynamics of a Microparticle Pair Traveling in Confined Flow." In ASME 2017 International Mechanical Engineering Congress and Exposition. American Society of Mechanical Engineers, 2017. http://dx.doi.org/10.1115/imece2017-72297.

Full text
Abstract:
In recent years, particle hydrodynamic focusing and ordering in a confined microchannel has been developed as a promising technique in lab-on-a-chip systems such as microparticle/cell separation, on-chip flow cytometry and detection. During the focusing, the uniformly distributed finite-sized particles from the channel inlet migrate across streamlines to several equilibrium positions according to the balance between series of hydrodynamic lift forces. While most studies in literature focus on single particle’s motion in the hydrodynamic focusing process by considering particle-liquid interactions, very few of them investigate particle-particle interactions, which is important in particle ordering and manipulation at high throughput. In this study, we use an immersed boundary (IB) - lattice Boltzmann (LB) coupled model to investigate the dynamic behaviors of a particle pair traveling through a square microchannel. The utilized numerical model retains the advantages of both LBM and IBM, which can accurately model the momentum exchange between liquid and particles, and conveniently treat complex geometry and movement of liquid-particle surfaces. By conducting numerical simulations, the time-dependent dynamic behaviors of particle pairs, including trajectories and interactions from initial rest condition to final quasi-equilibrium condition are obtained. Influences of important factors, such as Reynolds number and particle sizes on particles’ motions are discussed and the underlying physical mechanisms of particle-particle interactions are revealed in-depth.
APA, Harvard, Vancouver, ISO, and other styles
5

Polizos, Georgios, Daniel A. Schaeffer, D. Barton Smith, Dominic F. Lee, Panos G. Datskos, and Scott R. Hunter. "Enhanced Durability Transparent Superhydrophobic Anti-Soiling Coatings for CSP Applications." In ASME 2014 8th International Conference on Energy Sustainability collocated with the ASME 2014 12th International Conference on Fuel Cell Science, Engineering and Technology. American Society of Mechanical Engineers, 2014. http://dx.doi.org/10.1115/es2014-6505.

Full text
Abstract:
Optically transparent superhydrophobic (SH) coatings based on multifunctional silica nanoparticles and polymeric binders were developed and their optical and abrasion resistance properties were studied. Three key factors are emphasized: i) The optical clarity of the coatings. Particle deagglomeration and surface functionalization techniques were developed to obtain particle size distributions with an average size smaller than 200 nm. The particles were uniformly dispersed in organic binders and resulted in coatings with an average roughness value smaller than 30 nm. The nano-sized particles do not scatter light at wavelengths &gt; 250 nm because of their small dimensions. ii) Enhanced particle-binder interfaces. We have introduced a double functionality on the particle’s surface in order to partially crosslink them with the polymeric binder. This multifunctional configuration significantly improves the abrasion resistance of the coatings without degrading their SH properties. iii) Accelerated weathering durability. Coatings were subjected to simulated solar UV exposure. Our ongoing studies indicate that the coatings are environmentally durable over several years of simulated UVA exposure. The nanostructure-property interdependencies underlined in the above three key factors are utilized in the development of transparent SH coatings with enhanced durability.
APA, Harvard, Vancouver, ISO, and other styles
6

Ho, Clifford K., Joshua M. Christian, Adam C. Moya, Josh Taylor, Daniel Ray, and John Kelton. "Experimental and Numerical Studies of Air Curtains for Falling Particle Receivers." In ASME 2014 8th International Conference on Energy Sustainability collocated with the ASME 2014 12th International Conference on Fuel Cell Science, Engineering and Technology. American Society of Mechanical Engineers, 2014. http://dx.doi.org/10.1115/es2014-6632.

Full text
Abstract:
The use of an air curtain blowing across the aperture of a falling-particle receiver has been proposed to mitigate convective heat losses and to protect the flow of particles from external winds. This paper presents experimental and numerical studies that evaluate the impact of an air curtain on the performance of a falling particle receiver. Unheated experimental studies were performed to evaluate the impact of various factors (particle size, particle mass flow rate, particle release location, air-curtain flow rate, and external wind) on particle flow, stability, and loss through the aperture. Numerical simulations were performed to evaluate the impact of an air curtain on the thermal efficiency of a falling particle receiver at different operating temperatures. Results showed that the air curtain reduced particle loss when particles were released near the aperture in the presence of external wind, but the presence of the air curtain did not generally improve the flow characteristics and loss of the particles for other scenarios. Numerical results showed that the presence of an air curtain could reduce the convective heat losses, but only at higher temperatures (&gt;600°C) when buoyant hot air leaving the aperture was significant.
APA, Harvard, Vancouver, ISO, and other styles
7

Cruz-Díaz, Alvin O., and Rubén E. Díaz-Rivera. "Hydrodynamically Induced Whole-Cell Manipulation in Micro-Fluidic Devices." In ASME 2011 Summer Bioengineering Conference. American Society of Mechanical Engineers, 2011. http://dx.doi.org/10.1115/sbc2011-53980.

Full text
Abstract:
The increasing interest for dedicated analysis of single particles at microscopic scales, such as biological cells, has led researchers to create micro-fluidic systems capable of trapping particles in a liquid flow. The most common trapping mechanism is by physical obstruction, which is simple, but it has its limitations. For instance, in these systems particle selectivity is poor because all the particles that pass through the channel may get pin down against the physical obstruction regardless of the size and shape of the particle [Di Carlo et al., Tan et al., Nilsson et al.]. In addition, releasing the particles that have been trapped presents a problem not only because the flow needs to be stopped or reversed, but because there is a high probability that the released particles are going to be trapped again when the system resumes its operation [Nilsson et al.]. Other devices use pressure differentials to trap the particles but each trap requires a separate flow or a valve mechanism for trap activation. This method requires multiple pumps or complex structures within the device such as micro-valves and actuators.
APA, Harvard, Vancouver, ISO, and other styles
8

Ma, Zhiwen, Ruichong Zhang, and Fadi Sawaged. "Design of Particle-Based Thermal Energy Storage for a Concentrating Solar Power System." In ASME 2017 11th International Conference on Energy Sustainability collocated with the ASME 2017 Power Conference Joint With ICOPE-17, the ASME 2017 15th International Conference on Fuel Cell Science, Engineering and Technology, and the ASME 2017 Nuclear Forum. American Society of Mechanical Engineers, 2017. http://dx.doi.org/10.1115/es2017-3099.

Full text
Abstract:
Solid particles can operate at higher temperature than current molten salt or oil, and they can be a heat-transfer and storage medium in a concentrating solar power (CSP) system. By using inexpensive solid particles and containment material for thermal energy storage (TES), the particle-TES cost can be significantly lower than other TES methods such as a nitrate-salt system. The particle-TES system can hold hot particles at more than 800°C with high thermal performance. The high particle temperatures increase the temperature difference between the hot and cold particles, and they improve the TES capacity. The particle-based CSP system is able to support high-efficiency power generation, such as the supercritical carbon-dioxide Brayton power cycle, to achieve &gt;50% thermal-electric conversion efficiency. This paper describes a solid particle-TES system that integrates into a CSP plant. The hot particles discharge to a heat exchanger to drive the power cycle. The returning cold particles circulate through a particle receiver to absorb solar heat and charge the TES. This paper shows the design of a particle-TES system including containment silos, foundation, silo insulation, and particle materials. The analysis provides results for four TES capacities and two silo configurations. The design analysis indicates that the system can achieve high thermal efficiency, storage effectiveness (i.e., percentage usage of the hot particles), and exergetic efficiency. An insulation method for the hot silo was considered. The particle-TES system can achieve high performance and low cost, and it holds potential for next-generation CSP technology.
APA, Harvard, Vancouver, ISO, and other styles
9

Chesnutt, Jennifer K. W., Bing Guo, and Chang-Yu Wu. "Assessment of Power Consumption of an Electrodynamic Dust Shield to Clean Solar Panels." In ASME 2016 Power Conference collocated with the ASME 2016 10th International Conference on Energy Sustainability and the ASME 2016 14th International Conference on Fuel Cell Science, Engineering and Technology. American Society of Mechanical Engineers, 2016. http://dx.doi.org/10.1115/power2016-59371.

Full text
Abstract:
Substantial time and money have been directed toward photovoltaic solar power. However, mitigation of dust on solar panels has been largely neglected. The objective of this research was to determine the performance and power consumption of an electrodynamic dust shield (EDS) to clean solar panels as a function of dust particle size. We utilized a discrete element method to computationally simulate the transport, collision, and electrodynamic interactions of particles subjected to electrodynamic waves generated by an EDS. The EDS consisted of electrodes embedded within a dielectric material. 1250 monodisperse particles with diameters of 30–50 μm were simulated. In the absence of particle-particle interactions, an increase in diameter increased particle transport distance due to increased particle charge. However, inclusion of particle-particle collisions produced interactions such that an intermediate diameter yielded the smallest transport distance. Average power required to lift a particle off the surface was smallest with the smallest particle; however, power requirement decreased with diameter with a constant loading of particles on the EDS. Calculated from our simulation data, power consumption per unit area of an experimental EDS agreed with previous experimental studies. Our study elucidated important aspects of EDS operation and power consumption to mitigate dust on solar panels.
APA, Harvard, Vancouver, ISO, and other styles
10

Fan, Jing, and Liqiu Wang. "Numerical Simulation of Thermal Conductivity of Nanofluids." In 2010 14th International Heat Transfer Conference. ASMEDC, 2010. http://dx.doi.org/10.1115/ihtc14-22453.

Full text
Abstract:
The recent first-principle model shows a dual-phase-lagging heat conduction in nanofluids at the macroscale. The macroscopic heat-conduction behavior and the thermal conductivity of nanofluids are determined by their molecular physics and microscale physics. We examine numerically effects of particle-fluid thermal conductivity ratio, particle volume fraction, shape, aggregation, and size distribution on macroscale thermal properties for nine types of nanofluids, without considering the interfacial thermal resistance and dynamic processes on particle-fluid interfaces and particle-particle contacting surfaces. The particle radius of gyration and non-dimensional particle-fluid interfacial area in the unit cell are two very important parameters in characterizing the effect of particles’ geometrical structures on thermal conductivity of nanofluids. Nanofluids containing cross-particle networks have conductivity which practically reaches the Hashin-Shtrikman bounds. Moreover, particle aggregation influences the effective thermal conductivity only when the distance between particles is less than the particle dimension. Uniformly-sized particles are desirable for the conductivity enhancement, although to a limited extent.
APA, Harvard, Vancouver, ISO, and other styles

Reports on the topic "Particle in CelI"

1

Finn, John M. Noise in particle-in-cell codes. Office of Scientific and Technical Information (OSTI), 2011. http://dx.doi.org/10.2172/1062123.

Full text
APA, Harvard, Vancouver, ISO, and other styles
2

Peter, William. An Object-Oriented Particle-in-Cell Code. Defense Technical Information Center, 1996. http://dx.doi.org/10.21236/ada311111.

Full text
APA, Harvard, Vancouver, ISO, and other styles
3

J.L.V. Lewandowski. Particle-in-cell Simulations with Kinetic Electrons. Office of Scientific and Technical Information (OSTI), 2004. http://dx.doi.org/10.2172/821523.

Full text
APA, Harvard, Vancouver, ISO, and other styles
4

Snider, D. M., P. J. O`Rourke, and M. J. Andrews. An incompressible two-dimensional multiphase particle-in-cell model for dense particle flows. Office of Scientific and Technical Information (OSTI), 1997. http://dx.doi.org/10.2172/510351.

Full text
APA, Harvard, Vancouver, ISO, and other styles
5

J.L.V. Lewandowski. Optimized Loading for Particle-in-cell Gyrokinetic Simulations. Office of Scientific and Technical Information (OSTI), 2004. http://dx.doi.org/10.2172/827943.

Full text
APA, Harvard, Vancouver, ISO, and other styles
6

Gladd, N. T. A C ++ Formulation for Particle-In-Cell Simulations. Defense Technical Information Center, 1995. http://dx.doi.org/10.21236/ada302566.

Full text
APA, Harvard, Vancouver, ISO, and other styles
7

J.L.V. Lewandowski. Multigrid Particle-in-cell Simulations of Plasma Microturbulence. Office of Scientific and Technical Information (OSTI), 2003. http://dx.doi.org/10.2172/814681.

Full text
APA, Harvard, Vancouver, ISO, and other styles
8

Sparks, Paul, Jesse Sherburn, William Heard, and Brett Williams. Penetration modeling of ultra‐high performance concrete using multiscale meshfree methods. Engineer Research and Development Center (U.S.), 2021. http://dx.doi.org/10.21079/11681/41963.

Full text
Abstract:
Terminal ballistics of concrete is of extreme importance to the military and civil communities. Over the past few decades, ultra‐high performance concrete (UHPC) has been developed for various applications in the design of protective structures because UHPC has an enhanced ballistic resistance over conventional strength concrete. Developing predictive numerical models of UHPC subjected to penetration is critical in understanding the material's enhanced performance. This study employs the advanced fundamental concrete (AFC) model, and it runs inside the reproducing kernel particle method (RKPM)‐based code known as the nonlinear meshfree analysis program (NMAP). NMAP is advantageous for modeling impact and penetration problems that exhibit extreme deformation and material fragmentation. A comprehensive experimental study was conducted to characterize the UHPC. The investigation consisted of fracture toughness testing, the utilization of nondestructive microcomputed tomography analysis, and projectile penetration shots on the UHPC targets. To improve the accuracy of the model, a new scaled damage evolution law (SDEL) is employed within the microcrack informed damage model. During the homogenized macroscopic calculation, the corresponding microscopic cell needs to be dimensionally equivalent to the mesh dimension when the partial differential equation becomes ill posed and strain softening ensues. Results of numerical investigations will be compared with results of penetration experiments.
APA, Harvard, Vancouver, ISO, and other styles
9

Joyce, Glenn, Martin Lampe, Steven P. Slinker, and Wallace M. Manheimer. Electrostatic Particle-in-Cell Simulation Technique for Quasineutral Plasma. Defense Technical Information Center, 1997. http://dx.doi.org/10.21236/ada323507.

Full text
APA, Harvard, Vancouver, ISO, and other styles
10

Kirwan, A. D., Grosch Jr., Holdzkom II C. E., and J. J. A Particle-in-Cell Model for Geophysical Fluid Flows. Defense Technical Information Center, 1995. http://dx.doi.org/10.21236/ada300184.

Full text
APA, Harvard, Vancouver, ISO, and other styles
You might also be interested in the extended bibliographies on the topic 'Particle in CelI' for particular source types:
Journal articles Dissertations / Theses Books
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!

To the bibliography