Relevant bibliographies by topics / Plasma distribution function

Academic literature on the topic 'Plasma distribution function'

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Published: 6 September 2023

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Journal articles on the topic "Plasma distribution function"

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Levko, Dmitry, Rochan R. Upadhyay, Laxminarayan L. Raja, Alok Ranjan, and Peter Ventzek. "Influence of electron energy distribution on fluid models of a low-pressure inductively coupled plasma discharge." Physics of Plasmas 29, no. 4 (April 2022): 043510. http://dx.doi.org/10.1063/5.0083274.

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The aim of the present paper is to examine the influence of assumption on the electron energy distribution function on the relation between the plasma potential and the electron temperature for both electropositive (argon) and electronegative (chlorine) plasmas. A one-dimensional fluid model is used for simplicity although similar results were obtained using a self-consistent two-dimensional fluid model coupled with the Maxwell's equations for inductively coupled plasmas. We find that for electropositive plasma only a bi-Maxwellian electron energy distribution function provides reasonable results compared to measurements in low-pressure inductively coupled plasmas, namely, the increasing plasma potential for increasing electron temperature. For electronegative plasma, the plasma potential is an increasing function of the electron temperature for all electron distributions considered in the model. However, the scaling factors do not agree with the conventional plasma theory. We explain these results by the deviation of electrons from a Boltzmann distribution, which is due to non-equilibrium and non-local nature of plasma at the low-pressure conditions.
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Orefice, A. "Relativistic theory of absorption and emission of electron cyclotron waves in anisotropic plasmas." Journal of Plasma Physics 39, no. 1 (February 1988): 61–70. http://dx.doi.org/10.1017/s002237780001285x.

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The weakly relativistic theory of absorption and emission of electron cyclotron waves in hot magnetized plasmas is developed for a large class of anisotropic electron distribution functions. The results are expressed in terms of the weakly relativistic plasma dispersion functions, and therefore of the well-known plasma Z-function. The particular case of a loss-cone electron distribution function is presented as a simple example.
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Saito, S., F. R. E. Forme, S. C. Buchert, S. Nozawa, and R. Fujii. "Effects of a kappa distribution function of electrons on incoherent scatter spectra." Annales Geophysicae 18, no. 9 (September 30, 2000): 1216–23. http://dx.doi.org/10.1007/s00585-000-1216-2.

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Abstract. In usual incoherent scatter data analysis, the plasma distribution function is assumed to be Maxwellian. In space plasmas, however, distribution functions with a high energy tail which can be well modeled by a generalized Lorentzian distribution function with spectral index kappa (kappa distribution) have been observed. We have theoretically calculated incoherent scatter spectra for a plasma that consists of electrons with kappa distribution function and ions with Maxwellian neglecting the effects of the magnetic field and collisions. The ion line spectra have a double-humped shape similar to those from a Maxwellian plasma. The electron temperatures are underestimated, however, by up to 40% when interpreted assuming Maxwellian distribution. Ion temperatures and electron densities are affected little. Accordingly, actual electron temperatures might be underestimated when an energy input maintaining a high energy tail exists. We have also calculated plasma lines with the kappa distribution function. They are enhanced in total strength, and the peak frequencies appear to be slightly shifted to the transmitter frequency compared to the peak frequencies for a Maxwellian distribution. The damping rate depends on the electron temperature. For lower electron temperatures, plasma lines for electrons with a κ distribution function are more strongly damped than for a Maxwellian distribution. For higher electron temperatures, however, they have a relatively sharp peak.Key words: Ionosphere (auroral ionosphere; plasma waves and instabilities) – Space plasma physics (kinetic and MHD theory)
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Nicolaou, Georgios, George Livadiotis, and Robert T. Wicks. "On the Determination of Kappa Distribution Functions from Space Plasma Observations." Entropy 22, no. 2 (February 13, 2020): 212. http://dx.doi.org/10.3390/e22020212.

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The velocities of space plasma particles, often follow kappa distribution functions. The kappa index, which labels and governs these distributions, is an important parameter in understanding the plasma dynamics. Space science missions often carry plasma instruments on board which observe the plasma particles and construct their velocity distribution functions. A proper analysis of the velocity distribution functions derives the plasma bulk parameters, such as the plasma density, speed, temperature, and kappa index. Commonly, the plasma bulk density, velocity, and temperature are determined from the velocity moments of the observed distribution function. Interestingly, recent studies demonstrated the calculation of the kappa index from the speed (kinetic energy) moments of the distribution function. Such a novel calculation could be very useful in future analyses and applications. This study examines the accuracy of the specific method using synthetic plasma proton observations by a typical electrostatic analyzer. We analyze the modeled observations in order to derive the plasma bulk parameters, which we compare with the parameters we used to model the observations in the first place. Through this comparison, we quantify the systematic and statistical errors in the derived moments, and we discuss their possible sources.
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Benisti, D., A. Friou, and L. Gremillet. "Nonlinear Electron Distribution Function in a Plasma." Interdisciplinary journal of Discontinuity, Nonlinearity, and Complexity 3, no. 4 (December 2014): 435–44. http://dx.doi.org/10.5890/dnc.2014.12.006.

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SHAIKH, DASTGEER, and B. DASGUPTA. "An analytic model of plasma-neutral coupling in the heliosphere plasma." Journal of Plasma Physics 76, no. 6 (June 30, 2010): 919–27. http://dx.doi.org/10.1017/s0022377810000310.

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AbstractWe have developed an analytic model to describe coupling of plasma and neutral fluids in the partially ionized heliosphere plasma medium. The sources employed in our analytic model are based on a κ-distribution as opposed to the Maxwellian distribution function. Our model uses the κ-distribution to analytically model the energetic neutral atoms that result in the heliosphere partially ionized plasma from charge exchange with the protons and subsequently produce a long tail, which is otherwise not describable by the Maxwellian distribution. We present our analytic formulation and describe major differences in the sources emerging from these two distinct distributions.
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Lago, V., A. Lebehot, Michel A. Dudeck, and Z. Szymanski. "ELECTRON ENERGY DISTRIBUTION FUNCTION IN PLASMA ARC JETS." High Temperature Material Processes (An International Quarterly of High-Technology Plasma Processes) 6, no. 1 (2002): 8. http://dx.doi.org/10.1615/hightempmatproc.v6.i1.20.

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Maslov, S. A., S. Ya Bronin, N. G. Gusein-zade, and S. A. Trigger. "Photon Distribution Function in Weakly Coupled Maxwellian Plasma." Bulletin of the Lebedev Physics Institute 46, no. 8 (August 2019): 263–66. http://dx.doi.org/10.3103/s1068335619080062.

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Hasegawa, Akira, Kunioki Mima, and Minh Duong-van. "Plasma Distribution Function in a Superthermal Radiation Field." Physical Review Letters 54, no. 24 (June 17, 1985): 2608–10. http://dx.doi.org/10.1103/physrevlett.54.2608.

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Melrose, D. B., and A. Mushtaq. "Plasma dispersion function for a Fermi–Dirac distribution." Physics of Plasmas 17, no. 12 (December 2010): 122103. http://dx.doi.org/10.1063/1.3528272.

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Dissertations / Theses on the topic "Plasma distribution function"

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Harada, Yuki. "Interactions of Earth's Magnetotail Plasma with the Surface, Plasma, and Magnetic Anomalies of the Moon." 京都大学 (Kyoto University), 2014. http://hdl.handle.net/2433/188495.

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Mukhopadhyay, Amit Kumar. "Statistics for motion of microparticles in a plasma." Diss., University of Iowa, 2014. https://ir.uiowa.edu/etd/1369.

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I report experimental and numerical studies of microparticle motion in a dusty plasma. These microparticles are negatively charged and are levitated in a plasma consisting of electrons, ions and neutral gas atoms. The microparticles repel each other, and are confined by the electric fields in the plasma. The neutral gas damps the microparticle motion, and also exerts random forces on them. I investigate and characterize microparticle motion. In order to do this, I study velocity distributions of microparticles and correlations of their motion. To perform such a study, I develop new experimental and analysis techniques. My thesis consists of four separate projects. In the first project, the battle between deterministic and random motion of microparticles is investigated. Two particle velocity distributions and correlations have previously studied only in theory. I performed an experiment with a very simple one dimensional (1D) system of two microparticles in a plasma. My study of velocity correlations involves just two microparticles which is the simplest system that allows interactions. A study of such a simple system provides insight into the motions of the microparticles. It allowed for the experimental measurement of two-particle distributions and correlations. For such a system, it is shown that the motion of the microparticles is dominated by deterministic or oscillatory effects. In the second project, two experiments with just two microparticles are performed to isolate the effects of ion wakes. The two experiments differ in the alignment of the two microparticles: they are aligned either perpendicular or parallel to the ion flow. To have different alignments, the sheath is shaped differently in the two experiments. I demonstrate that microparticle motion is more correlated when they are aligned along the ion flow, rather than perpendicular to the ion flow. In the third project, I develop a model with some key assumptions to compare with the experiments in the first two projects. My model includes all significant forces: gravity, electrical forces due to curved sheath and interparticle interaction, and gas forces. The model does not agree with both the experiments. In the last project, I study the non-Gaussian statistics by analyzing data for microparticle motion from an experiment performed under microgranity conditions. Microparticle motion is studied in a very thin region of microparticles in a three dimensional dust cloud. The microparticle velocity distributions exhibit non-Gaussian characteristics.
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Behlman, Nicholas James. "Electron Energy Distribution Measurements in the Plume Region of a Low Current Hollow Cathode." Digital WPI, 2010. https://digitalcommons.wpi.edu/etd-theses/72.

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A hollow cathode is an electron source used in a number of different electric thrusters for space propulsion. One important component of the device that helps initiate and sustain the discharge is called the keeper electrode. Cathode keeper erosion is one of the main limiting factors in the lifetime of electric thrusters. Sputtering due to high-energy ion bombardment is believed to be responsible for keeper erosion. Existing models of the cathode plume, including the OrCa2D code developed at Jet Propulsion Laboratory, do not predict these high-energy ions and experimental measurement of the electron energy distribution function (EEDF) could provide useful information for the development of a high fidelity model of the plume region. Understanding of the mechanism by which these high-energy ions are produced could lead to improvements in the design of hollow cathodes. The primary focus of this work is to determine the EEDF in the cathode plume. A single Langmuir probe is used to measure the current-voltage (I-V) characteristic of the plasma plume from a low current hollow cathode in the region downstream of the keeper orifice. The EEDF is obtained using the Druyvesteyn procedure (based on interpretation of the second derivative of the I-V curve), and parameters such as electron temperature, plasma density and plasma potential are also obtained. The dependence of the EEDF and other parameters on the radial position in the plume is examined. Results show that the EEDF deviates from the Maxwellian distribution, and is more accurately described by the Druyvesteyn distribution directly downstream of the cathode. Off-axis measurements of the EEDF indicate the presence of fast electrons, most likely due to the anode geometry. The cathode used in these tests is representative of the cathode used in a 200W class Hall thruster. Data is presented for a hollow cathode operating on argon gas for two cases with different discharge currents.
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Montello, Aaron David. "Studies of Nitrogen Vibrational Distribution Function and Rotational-Translational Temperature in Nonequilibrium Plasmas by Picosecond Coherent Anti-Stokes Raman Scattering Spectroscopy." The Ohio State University, 2012. http://rave.ohiolink.edu/etdc/view?acc_num=osu1345522814.

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Li, Chun. "Measurement and understanding the residual stress distribution as a function of depth in atmosphere plasma sprayed thermal barrier coatings." Thesis, University of Manchester, 2018. https://www.research.manchester.ac.uk/portal/en/theses/measurement-and-understanding-the-residual-stress-distribution-as-a-function-of-depth-in-atmosphere-plasma-sprayed-thermal-barrier-coatings(e4dd38cc-2800-4719-bfe5-cccd0d6ff8c8).html.

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Residual stresses are generally considered to be the driving forces for the failure of APS TBCs. In this thesis, the residual stress distribution as a function of depth in APS TBC has been measured by synchrotron XRD and explained by image based modelling based on the microstructure detailed studied by SEM and CT. The residual stress/ strain distribution as a function of depth was measured by synchrotron XRD in transmission and reflection geometry. The residual stress/ strain values were analysed using full pattern Rietveld refinement, the sin square psi method and XRD2 method. For the reflection geometry, a new method was developed to deconvolute the residual stress value in each depth from the measured averaged values. Two types of residual stress/strain distribution were observed. The first kind of residual stress was found to be compressive and followed a non-linear trend, which increased from the surface to the interface, decreased slightly and increased again to the interface. This trend showed a jump feature near the interface. The second kind of residual stress distribution possessed two jump features: one near the interface similar to the first kind and another jump feature near the sample surface. The residual stress in both beta and gama phase in the bond coat were also investigated which showed a tensile stress state. The stress trend predicted by our analytical model followed a linear relationship. Comparing this with the first kind of residual stress distribution, two main differences were shown. Firstly the jump feature near the interface and secondly the much larger overall stress gradient. The 3D and 2D microstructure of the sample with the first kind of residual stress distribution was observed by X-ray CT and SEM. The effect of pores, inter-splat cracks and the rumpling interface on the residual stress distribution was investigated by image based modelling. It was proved that the pores and the inter-splat cracks had no large influence on the stress distribution and the jump feature near the interface was a result of the rumpling interface. The much larger stress gradient observed in the measured residual stress distribution was an indication of the stress relaxation in the coating which was proved by a specially designed mechanical test. To explain the jump feature near the sample surface in the second kind of stress distribution. 3D microstructures of the measured samples were observed using X-ray CT. The effect of vertical and the side cracks on the stress distribution were investigated by image based modelling. It was found that the vertical crack had no large influence on the residual stress distribution and the jump feature in the stress trend near the surface could be attributed to the side crack. The effect of other kinds of cracks that were not directly observed in our samples, such as middle or through side cracks, were also investigated. These results were used to develop a semi-destructive method to determine the existence and distribution of cracks in APS TBC.
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Lunt, Tilmann. "Experimental investigation of the plasma-wall transition." Doctoral thesis, Humboldt-Universität zu Berlin, Mathematisch-Naturwissenschaftliche Fakultät I, 2008. http://dx.doi.org/10.18452/15837.

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In der vorliegenden Arbeit wurde das Strömungsverhalten eines magnetisierten Argonplasmas beim Auftreffen auf eine neutralisierende Oberfläche untersucht. Mit Hilfe der Laserinduzierten Fluoreszenz wurde dazu nicht-invasiv die Geschwindigkeitsverteilung der Ionen mit einer Ortsauflösung von standardmäßig dz=0.5 mm als Funktion des Abstandes zur Oberfläche gemessen. Zwei Situationen wurden untersucht (a): praktisch das ganze Plasma strömt auf ein großes Target (Durchmesser 100 mm) und (b) die Größe des Targets ist wesentlich kleiner (Durchmesser 15 mm) als der Durchmesser der Plasmasäule. Unmittelbar vor der Oberfläche war in beiden Fällen die Strömungsgeschwindigkeit u mindestens so groß wie die Ionenschallgeschwindigkeit cs, genau wie von Bohm bereits 1949 vorhergesagt[]. Unter fusionsrelevanten Bedingungen ist dies die erste direkte Beobachtung des Bohmkriteriums. Bei Annäherung an die Oberfläche steigt die Machzahl M=u/cs von 0.5 auf 1 auf typischen Skalenlängen lambda_a=30 mm bzw. lambda_b=5 mm an. Um diese kurzen Längen erklären zu können wurden die Messdaten in (a) mit einem Stoß-Diffusionsmodell und im Falle von (b) mit dem Modell von Hutchinson[] verglichen. Eine gute Übereinstimmung in (a) wurde erzielt, wenn eine sehr niedrige Neutralgastemperatur von etwa 400 K angenommen wird. Die Messdaten in (b) werden sehr gut durch das Modell wiedergegeben, wenn ein Transportkoeffizient von D=20 m²/s angenommen wird. Ein derartig hoher Transport kann unmöglich allein durch Diffusion verursacht werden. Teilweise kann dieser Transport anhand der endlichen Gyroradien erklärt werden, vermutlich aber spielen auch zeitabhängige Phänomene, wie z.B. Driftwellen eine wichtige Rolle. Weiterhin wurde die Abhängigkeit von dem Winkel zwischen Flächennormalen und B-Feld untersucht. Die unmittelbar vor der Oberfläche auftretenden Überschallströmungen werden verhältnismäßig gut von dem Modell von Chodura[] beschrieben. Im Gegensatz dazu ist die Größe der Zone in der Machzahlen größer eins auftreten deutlich kleiner, als vom Modell vorhergesagt.
In the present work the streaming behavior of a magnetized argon plasma impinging on a neutralizing surface was investigated. For that purpose the ion velocity distribution was measured non-invasively as a function of the distance to the surface by means of Laser Induced Fluorescence. The spatial resolution was typically dz=0.5 mm. Two situations are investigated, (a): when practically the whole plasma streams onto a large target (diameter 100 mm), and (b): when the size of the target (diameter 15 mm) is significantly smaller than the diameter of the plasma column. In both cases the streaming velocity u was at least as high as the ion acoustic sound speed, as already predicted by Bohm in 1949. Under fusion relevant conditions this is the first direct observation of the Bohm criterion. Approaching the target surface the Mach number M=u/c_s increases from values of around 0.5 to 1 on typical scales of lambda_a=30 mm and lambda_b=5 mm, respectively. In order to explain these very short scale lengths the measured data were compared with a collisional-diffusive model in the case of (a) and with Hutchinson''s model[] in the case of (b). A good agreement was achieved in (a) by assuming a very low neutral gas temperature of about 400 K. In (b) the model fits the data excellently when the transport coefficient is chosen as high as D=20 m²/s. Such a high transport cannot be caused solely by diffusion. Partly it is explained by finite gyro-radii effects, but presumably time dependent phenomena, like drift waves, play an important role. In addition the dependence on the angle between surface normal and B-field was investigated. The supersonic fluxes found in the immediate vicinity of the surface are described fairly well by the model developed by Chodura[]. By contrast the size of the region, where Mach numbers greater one appear is significantly smaller than predicted.
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Vitelaru, Catalin. "Caractérisation du procédé plasma de pulvérisation cathodique magnétron à ionisation additionnelle pour la synthèse de couches minces." Thesis, Paris 11, 2011. http://www.theses.fr/2011PA112077.

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Les exigences de plus en plus élevés concernant la qualité et propriétés de couches minces ont soutenu le développement de nouveaux procédés de pulvérisation. Ainsi, la décharge magnétron conventionnelle en courant continu, une des sources d’atomes la plus utilisée pour le dépôt de couches minces, a été améliorée par le couplage avec une décharge additionnelle de radio fréquence pour obtenir le nouveau procédé RF-IPVD (Radio Frequency-Ionized Physical Vapour Deposition). Ce procédé permet de générer un degré d’ionisation supérieur à celui dans la décharge magnétron classique, nécessaire pour contrôler les propriétés des couches minces. Un procédé alternatif pour augmenter d’avantage l’ionisation consiste à appliquer des impulsions haute puissance sur la cathode HPPMS (High Power Pulsed Magnetron Sputtering), pour des durés courtes de l’ordre de ųs ou dizaines de ųs. L’étude menée porte sur les phénomènes de pulvérisation et de transport des espèces du métal dans ces trois versions de la décharge magnétron par les moyens de spectroscopie laser à l’aide des diodes laser accordables. Le développement récent de ces diodes nous a permis de sonder les niveaux fondamentaux du Titane et de l’Aluminium, et de caractériser la dépendance spatiale de la densité et température ainsi que la fonction de distribution en vitesse de ces atomes. L’effet des paramètres clés, comme l’intensité du courant et la pression du gaz, est étudie et décrit pour la décharge magnétron conventionnelle. La distribution spatiale et angulaire de la fonction de distribution en vitesses a été mesurée dans la région devant la cible magnétron, afin de caractériser les flux du métal et leur comportement dans le volume de la décharge. L’étude sur les atomes du métal dans le procédé RF-IPVD est concentrée sur l’effet de la décharge additionnelle sur le dépeuplement du niveau fondamental. Une efficacité plus grande des processus d’ionisation est trouvée à plus haute pression et plus haute puissance RF injecté. On a montré aussi que les atomes affectés par les processus d’ionisation sont ceux thermalisées, tandis que la distribution de atomes rapides n’est quasiment pas affectés par la décharge additionnelle.Le diagnostic de la décharge pulsée a nécessité le développement d’une nouvelle procédure expérimentale, capable de suivre l’évolution de la densité et de la température des espèces neutres avec une résolution de l’ordre de la ųs. Cette procédure nous a servi pour décrire l’évolution spatio-temporel des atomes du métal (Ti et Al) et les atomes métastables d’Ar. Ces études offrent une vue globale sur le transport de atomes pulvérisés pendant la post décharge, ainsi qu’une description du fonctionnement de la décharge pulsé via la création des métastables d’Argon
The higher requirements on the thin films quality have supported the development of new sputtering techniques. Thus, the conventional DC magnetron discharge, one of the most widely used source of atoms for thin film deposition, has been improved by the addition of an auxiliary radio frequency discharge - new technique called RF-IPVD (Radio Frequency -Ionized Physical Vapor Deposition). This technique highly increases the ionization degree compared to conventional magnetron discharge, which is necessary for a better control of the thin films properties. An alternative method to increase the ionization is based on the use of high power pulses on the cathode, HPPMS (High Power Pulsed Magnetron Sputtering), for short periods of time ranging from ųs to tens of ųs.The present study focuses on the sputtering phenomena and the transport of metal sputtered species in these three versions of the magnetron discharge, by means of laser spectroscopy using tunable laser diodes. The recent developments of these diodes have allowed to probe the fundamental levels of titanium and aluminum, and to characterize the spatial dependency of the density and temperature as well as the velocity distribution functions of these atoms. The effect of key discharge parameters, such as current intensity and gas pressure, is studied and described for the conventional magnetron discharge. The spatial and angular velocity distribution functions were measured in front of the magnetron target, in order to characterize the metal fluxes and their behavior in the discharge volume.The study on the metal atoms in the RF-IPVD process is focused on the effect of the additional discharge on the depopulation of the ground state level. Higher ionization efficiency is found at relatively high pressure and it increases with the injected RF power. It was also showed that the thermalized atoms are the ones involved in the ionization process, while the distribution of fast atoms is almost unaffected by the additional discharge.The diagnostics of the HPPMS discharge required the development of a novel experimental procedure, able to monitor the density and temperature of neutral species with a time resolution of ųs. This procedure was used to describe the spatiotemporal evolution of metal atoms (Ti and Al) and Ar metastable atoms. These studies provide an overview on the transport of sputtered atoms during the afterglow, and a description of the pulsed discharge operation, via the creation of metastable argon atoms
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Ahmad, Ahmad. "Etude de la production d'ions négatifs sur des surfaces de carbone dans un plasma d'hydrogène sans Cs à basse pression." Thesis, Aix-Marseille, 2012. http://www.theses.fr/2012AIXM4702/document.

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Cette thèse porte sur l'étude de la production d'ions négatifs (INs) en surface pour des applications à la fusion contrôlée. Les INs formés en surface d'un échantillon dans un plasma d'hydrogène à partir de bombardement par les ions positifs sont collectés et analysés en énergie par un spectromètre de masse (SM). Les fonctions de distribution en énergie des INs (FDIs) que mesure le SM sont différentes de celles émises par la surface f(E, Θ) du fait des modifications de trajectoires et d'énergie induites par la traversée du plasma et du SM. Afin de déterminer la FDI émis par la surface f(E, Θ) en se servant des fonctions de distribution mesurée par le SM f''(E) nous avons développé un modèle qui calcule les trajectoires des ions entre la surface et le détecteur du SM. A partir d'une fonction test f(E,Θ) il est alors possible de calculer f''(E) et de comparer à l'expérience. L'élément critique de cette méthode est le choix de f (E, Θ). Le choix effectué dans cette thèse est la fonction de distribution des neutres calculée par le logiciel SRIM pour les particules pulvérisées et rétrodiffusées lors de bombardement d'une surface dans des conditions similaires aux conditions expérimentales. Les résultats du modèle montrent un bon accord entre les FDIs expérimentales et les fonctions calculées, et valident nos calculs et le choix de SRIM.Dans le but de comparer les mécanismes de production et les rendements des INs, une étude comparative a été réalisée sur différents matériaux carbonés. Les FDIs mesurées présentent la même forme à la température ambiante
This thesis deals with negative ions (INs) surface production for applications in controlled fusion. Negative ions (NIs) formed at the sample surface from positive ions bombardment in hydrogen plasma are collected and analyzed with energy mass spectrometer (MS). The NI energy distribution functions (NIDF) measured by the MS are different from those emitted from surface f(E, Θ) due to modifications trajectories and energies which result when NI cross plasma and MS. In order to determine the NIDF emitted by the surface f(E,Θ) using the NIDF measured by MS f''(E), we developed a model that calculates the ion trajectories between the surface and MS detector. Then from a test function f(E,Θ) it is possible to calculate f''(E) and compare it to the experimental one. The critical issue is this method is the choice of f(E, Θ). The approach used in this thesis is the neutral backscattered and sputtered distribution function calculated by SRIM software during a surface bombardment similar to the experimental conditions. The model resulting show a good agreement between experimental and calculated NIDF, and validate our calculations and the choice of SRIM.In order to compare production mechanisms and NIs yields, a comparative study on different carbons materials was performed. Measured NIDFs show the same shape at room temperature. This indicates that the mechanisms involved in the NI production and the contribution of these mechanisms in the NIDF are the same for all materials. The best NI yield at low temperature is observed on DLC surface. The highest NI yield for all temperatures is observed on Boron doped diamond (BDD) surface at 400°C
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Roettgen, Andrew M. "Vibrational Energy Distribution, Electron Density and Electron Temperature Behavior in Nanosecond Pulse Discharge Plasmas by Raman and Thomson Scattering." The Ohio State University, 2015. http://rave.ohiolink.edu/etdc/view?acc_num=osu1428940661.

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Blessington, Jon C. "Measurements of metastable atom density using energies and densities of energetic "fast" electrons detected in the electron energy distribution function associated with the afterglow plasma produced by a radio frequency inductively coupled plasma helium discharge." Morgantown, W. Va. : [West Virginia University Libraries], 2007. https://eidr.wvu.edu/etd/documentdata.eTD?documentid=5214.

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Thesis (M.S.)--West Virginia University, 2007.
Title from document title page. Document formatted into pages; contains v, 36 p. : ill. (some col.). Includes abstract. Includes bibliographical references (p. 21).
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Books on the topic "Plasma distribution function"

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United States. National Aeronautics and Space Administration., ed. Stationary plasma thruster ion velocity distributions. [Washington, DC]: National Aeronautics and Space Administration, 1994.

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Mehta, Shailesh. The Monte Carlo approach to calculating radial distribution functions in dense plasmas. Birmingham: University of Birmingham, 1995.

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library, Wiley online, ed. Plasma technology for hyperfunctional surfaces: Food, biomedical and textile applications. Weinheim: Wiley-VCH, 2010.

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Kortgen, Andreas, and Michael Bauer. The effect of acute hepatic failure on drug handling in the critically ill. Oxford University Press, 2016. http://dx.doi.org/10.1093/med/9780199600830.003.0197.

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Impaired hepatic function is a common event in intensive care unit patients and as the liver plays a central role in drug metabolism and excretion this may lead to profound changes in pharmacokinetics. Underlying mechanisms are altered enzyme function of phase I and phase II metabolism, altered transporter protein function together with cholestasis and hepatic perfusion disorders. Moreover, multidrug therapy may lead to induction and inhibition of these enzymes and transporter proteins. In addition, changes in plasma protein binding and volumes of distribution of drugs are common. Altogether, these changes may not only lead to sometimes unpredictable plasma levels of xenobiotics, but also to drug-induced liver injury when hepatocellular accumulation of noxious substances occurs. Concomitant renal dysfunction may further complicate this situation. Pharmacodynamic alterations might also occur. In conclusion, the clinician must carefully evaluate medication given to patients with hepatic failure. Therapeutic drug monitoring should be performed wherever available to guide therapy.
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Raghunathan, Karthik, and Andrew Shaw. Crystalloids in critical illness. Oxford University Press, 2016. http://dx.doi.org/10.1093/med/9780199600830.003.0057.

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‘Crystalloid’ refers to solutions of crystalline substances that can pass through a semipermeable membrane and are distributed widely in body fluid compartments. The conventional Starling model predicts transvascular exchange based on the net balance of opposing hydrostatic and oncotic forces. Based on this model, colloids might be considered superior resuscitative fluids. However, observations of fluid behaviour during critical illness are not consistent with such predictions. Large randomized controlled studies have consistently found that colloids offer no survival advantage relative to crystalloids in critically-ill patients. A revised Starling model describes a central role for the endothelial glycocalyx in determining fluid disposition. This model supports crystalloid utilization in most critical care settings where the endothelial surface layer is disrupted and lower capillary pressures (hypovolaemia) make volume expansion with crystalloids effective, since transvascular filtration decreases, intravascular retention increases and clearance is significantly reduced. There are important negative consequences of both inadequate and excessive crystalloid resuscitation. Precise dosing may be titrated based on functional measures of preload responsiveness like pulse pressure variation or responses to manoeuvres such as passive leg raising. Crystalloids have variable electrolyte concentrations, volumes of distribution, and, consequently variable effects on plasma pH. Choosing balanced crystalloid solutions for resuscitation may be potentially advantageous versus ‘normal’ (isotonic, 0.9%) saline solutions. When used as the primary fluid for resuscitation, saline solutions may have adverse effects in critically-ill patients secondary to a reduction in the strong ion difference and hyperchloraemic, metabolic acidosis. Significant negative effects on immune and renal function may result as well.
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Morawetz, Klaus. Transient Time Period. Oxford University Press, 2018. http://dx.doi.org/10.1093/oso/9780198797241.003.0019.

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The formation of correlations at short- time scales is considered. A universal response function is found which allows describing the formation of collective modes in plasmas created by femto-second lasers as well as the formation of occupations in cold atomic optical lattices. Quantum quench and sudden switching of interactions are possible to describe by such Levinson-type kinetic equations on the transient time regime. On larger time scales it is shown that non-Markovian–Levnson equations double count correlations and the extended quasiparticle picture to distinguish between the reduced density matrix and quasiparticle distribution solve this shortcoming. The problem of initial correlations and how they can be incorporated into the Green’s function technique to result into modified kinetic equations is solved and a systematic expansion is suggested.
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Book chapters on the topic "Plasma distribution function"

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Niel, Fabien. "Photon Distribution Function." In Classical and Quantum Description of Plasma and Radiation in Strong Fields, 155–69. Cham: Springer International Publishing, 2021. http://dx.doi.org/10.1007/978-3-030-73547-0_7.

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Capitelli, Mario, Roberto Celiberto, Gianpiero Colonna, Fabrizio Esposito, Claudine Gorse, Khaled Hassouni, Annarita Laricchiuta, and Savino Longo. "Superelastic Collisions and Electron Energy Distribution Function." In Fundamental Aspects of Plasma Chemical Physics, 113–42. New York, NY: Springer New York, 2016. http://dx.doi.org/10.1007/978-1-4419-8185-1_5.

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Kawata, Shigeo. "Plasma Treated by Distribution Function: Kinetic Model." In Springer Series in Plasma Science and Technology, 111–45. Singapore: Springer Nature Singapore, 2023. http://dx.doi.org/10.1007/978-981-99-1137-0_6.

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Niel, Fabien. "Effect of RR on the Electron Distribution Function." In Classical and Quantum Description of Plasma and Radiation in Strong Fields, 99–136. Cham: Springer International Publishing, 2021. http://dx.doi.org/10.1007/978-3-030-73547-0_5.

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Cereceda, C., M. de Peretti, and M. Sabatier. "Distribution Function of Charged Particles in a Plasma of Fusion Interest." In Strongly Coupled Coulomb Systems, 543–46. Boston, MA: Springer US, 2002. http://dx.doi.org/10.1007/0-306-47086-1_99.

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Ueno, Genta, Nagatomo Nakamura, Tomoyuki Higuchi, Takashi Tsuchiya, Shinobu Machida, and Tohru Araki. "Application of Multivariate Maxwellian Mixture Model to Plasma Velocity Distribution Function." In Discovery Science, 197–211. Berlin, Heidelberg: Springer Berlin Heidelberg, 2000. http://dx.doi.org/10.1007/3-540-44418-1_16.

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Möbius, E., L. M. Kistler, M. A. Popecki, K. N. Crocker, M. Granoff, Y. Jiang, E. Sartori, et al. "The 3-D Plasma Distribution Function Analyzers with Time-of-Flight Mass Discrimination for Cluster, FAST, and Equator-S." In Measurement Techniques in Space Plasmas: Particles, 243–48. Washington, D. C.: American Geophysical Union, 2013. http://dx.doi.org/10.1029/gm102p0243.

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Saikia, Banashree, and P. N. Deka. "Non-linear Fluctuating Parts of the Particle Distribution Function in the Presence of Drift Wave Turbulence in Vlasov Plasma." In Nonlinear Dynamics and Applications, 225–31. Cham: Springer International Publishing, 2022. http://dx.doi.org/10.1007/978-3-030-99792-2_20.

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Bauche, Jacques, Claire Bauche-Arnoult, and Olivier Peyrusse. "Distribution functions. Energy levels." In Atomic Properties in Hot Plasmas, 37–52. Cham: Springer International Publishing, 2015. http://dx.doi.org/10.1007/978-3-319-18147-9_3.

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Fahr, Hans-Jörg, and Horst Fichtner. "On ‘Isobaric and Isentropic’ Distribution Functions of Plasma Particles in the Heliosheath." In Kappa Distributions, 145–62. Cham: Springer International Publishing, 2021. http://dx.doi.org/10.1007/978-3-030-82623-9_8.

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Conference papers on the topic "Plasma distribution function"

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Manservisi, S., V. G. Molinari, and A. Nespoli. "Electron distribution function in a strong electric field." In International Conference on Plasma Sciences (ICOPS). IEEE, 1993. http://dx.doi.org/10.1109/plasma.1993.593112.

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Roudaki, F. S. M. M. A., A. Salar Elahi, and M. Ghoranneviss. "Determination of electron energy distribution function in tokamak plasma." In 2015 IEEE International Conference on Plasma Sciences (ICOPS). IEEE, 2015. http://dx.doi.org/10.1109/plasma.2015.7179853.

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Meezan, N., and M. Cappelli. "Electron energy distribution function in a Hall discharge plasma." In 37th Joint Propulsion Conference and Exhibit. Reston, Virigina: American Institute of Aeronautics and Astronautics, 2001. http://dx.doi.org/10.2514/6.2001-3326.

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Scime, E., R. Murphy, I. Biloiu, and C. Compton. "Ion velocity distribution function measurements in a helium helicon plasma." In The 33rd IEEE International Conference on Plasma Science, 2006. ICOPS 2006. IEEE Conference Record - Abstracts. IEEE, 2006. http://dx.doi.org/10.1109/plasma.2006.1707036.

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Abbasi, Hossein, and Reza Shokoohi. "Influence of particle distribution function on plasma expansion into vacuum." In 2008 IEEE 35th International Conference on Plasma Science (ICOPS). IEEE, 2008. http://dx.doi.org/10.1109/plasma.2008.4591204.

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Garcia, M. "Molecular gas electron distribution function with space and time variation." In International Conference on Plasma Science (papers in summary form only received). IEEE, 1995. http://dx.doi.org/10.1109/plasma.1995.531584.

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Dodt, D., A. Dinklage, R. Fischer, K. Bartschat, O. Zatsarinny, Hans-Jürgen Hartfuss, Michel Dudeck, Jozef Musielok, and Marek J. Sadowski. "Form-Free Reconstruction of an Electron Energy Distribution Function from Optical Emission Spectroscopy." In PLASMA 2007: International Conference on Research and Applications of Plasmas; 4th German-Polish Conference on Plasma Diagnostics for Fusion and Applications; 6th French-Polish Seminar on Thermal Plasma in Space and Laboratory. AIP, 2008. http://dx.doi.org/10.1063/1.2909110.

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Halenka, J. "Joint Probability Distribution Function for the Electric Microfield and its Ion-Octupole Inhomogeneity Tensor." In PLASMA 2005: Int. Conf. on Research and Applications of Plasmas; 3rd German-Polish Conf.on Plasma Diagnostics for Fusion and Applications; 5th French-Polish Seminar on Thermal Plasma in Space and Laboratory. AIP, 2006. http://dx.doi.org/10.1063/1.2168882.

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Qureshi, M. N. S., J. K. Shi, and S. Z. Ma. "Landau damping in space plamas with generalized (r , q) distribution function." In The 33rd IEEE International Conference on Plasma Science, 2006. ICOPS 2006. IEEE Conference Record - Abstracts. IEEE, 2006. http://dx.doi.org/10.1109/plasma.2006.1707106.

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Adamovich, Igor, and J. Rich. "The effect of superelastic electron-molecule collisions on the vibrational energy distribution function." In 27th Plasma Dynamics and Lasers Conference. Reston, Virigina: American Institute of Aeronautics and Astronautics, 1996. http://dx.doi.org/10.2514/6.1996-2314.

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Reports on the topic "Plasma distribution function"

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Tynan, G. R., D. M. Goebel, and R. W. Conn. Measurement of parallel ion energy distribution function in PISCES plasma. Office of Scientific and Technical Information (OSTI), August 1987. http://dx.doi.org/10.2172/6268436.

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B.C. Lyons, S. C. Jardin, and J. J. Ramos. Numerical Calculation of Neoclassical Distribution Functions and Current Profiles in Low Collisionality, Axisymmetric Plasmas. Office of Scientific and Technical Information (OSTI), June 2012. http://dx.doi.org/10.2172/1057481.

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McClure, Michael A., Yitzhak Spiegel, David M. Bird, R. Salomon, and R. H. C. Curtis. Functional Analysis of Root-Knot Nematode Surface Coat Proteins to Develop Rational Targets for Plantibodies. United States Department of Agriculture, October 2001. http://dx.doi.org/10.32747/2001.7575284.bard.

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The goal of this research was to provide a better understanding of the interface between root-knot nematodes, Meloidogyne spp., and their host in order to develop rational targets for plantibodies and other novel methods of nematode control directed against the nematode surface coat (SC). Specific objectives were: 1. To produce additional monoclonal SC antibodies for use in Objectives 2, 3, and 4 and as candidates for development of plantibodies. 2. To determine the production and distribution of SC proteins during the infection process. 3. To use biochemical and immunological methods to perturbate the root-knot nematode SC in order to identify SC components that will serve as targets for rationally designed plantibodies. 4. To develop SC-mutant nematodes as additional tools for defining the role of the SC during infection. The external cuticular layer of nematodes is the epicuticle. In many nematodes, it is covered by a fuzzy material termed "surface coat" (SC). Since the SC is the outermost layer, it may playa role in the interaction between the nematode and its surroundings during all life stages in soil and during pathogenesis. The SC is composed mainly of proteins, carbohydrates (which can be part of glycoproteins), and lipids. SC proteins and glycoproteins have been labeled and extracted from preparasitic second-stage juveniles and adult females of Meloidogyne and specific antibodies have been raised against surface antigens. Antibodies can be used to gain more information about surface function and to isolate genes encoding for surface antigens. Characterization of surface antigens and their roles in different life-stages may be an important step towards the development of alternative control. Nevertheless, the role of the plant- parasitic nematode's surface in plant-nematode interaction is still not understood. Carbohydrates or carbohydrate-recognition domains (CROs) on the nematode surface may interact with CROs or carbohydrate molecules, on root surfaces or exudates, or be active after the nematode has penetrated into the root. Surface antigens undoubtedly play an important role in interactions with microorganisms that adhere to the nematodes. Polyclonal (PC) and monoclonal (MC) antibodies raised against Meloidogyne javanica, M. incognita and other plant-parasitic nematodes, were used to characterize the surface coat and secreted-excreted products of M. javanica and M. incognita. Some of the MC and PC antibodies raised against M. incognita showed cross-reactivity with the surface coat of M. javanica. Further characterization, in planta, of the epitopes recognized by the antibodies, showed that they were present in the parasitic juvenile stages and that the surface coat is shed during root penetration by the nematode and its migration between root cells. At the molecular level, we have followed two lines of experimentation. The first has been to identify genes encoding surface coat (SC) molecules, and we have isolated and characterized a small family of mucin genes from M. incognita. Our second approach has been to study host genes that respond to the nematode, and in particular, to the SC. Our previous work has identified a large suite of genes expressed in Lycopersicon esculentum giant cells, including the partial cDNA clone DB#131, which encodes a serine/threonine protein kinase. Isolation and predicted translation of the mature cDNA revealed a frame shift mutation in the translated region of nematode sensitive plants. By using primers homologous to conserved region of DB#131 we have identified the orthologues from three (nematode-resistant) Lycopersicon peruvianum strains and found that these plants lacked the mutation.
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Ohad, Itzhak, and Himadri Pakrasi. Role of Cytochrome B559 in Photoinhibition. United States Department of Agriculture, December 1995. http://dx.doi.org/10.32747/1995.7613031.bard.

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The aim of this research project was to obtain information on the role of the cytochrome b559 in the function of Photosystem-II (PSII) with special emphasis on the light induced photo inactivation of PSII and turnover of the photochemical reaction center II protein subunit RCII-D1. The major goals of this project were: 1) Isolation and sequencing of the Chlamydomonas chloroplast psbE and psbF genes encoding the cytochrome b559 a and b subunits respectively; 2) Generation of site directed mutants and testing the effect of such mutation on the function of PSII under various light conditions; 3) To obtain further information on the mechanism of the light induced degradation and replacement of the PSII core proteins. This information shall serve as a basis for the understanding of the role of the cytochrome b559 in the process of photoinhibition and recovery of photosynthetic activity as well as during low light induced turnover of the D1 protein. Unlike in other organisms in which the psbE and psbF genes encoding the a and b subunits of cytochrome b559, are part of an operon which also includes the psbL and psbJ genes, in Chlamydomonas these genes are transcribed from different regions of the chloroplast chromosome. The charge distribution of the derived amino-acid sequences of psbE and psbF gene products differs from that of the corresponding genes in other organisms as far as the rule of "positive charge in" is concerned relative to the process of the polypeptide insertion in the thylakoid membrane. However, the sum of the charges of both subunits corresponds to the above rule possibly indicating co-insertion of both subunits in the process of cytochrome b559 assembly. A plasmid designed for the introduction of site-specific mutations into the psbF gene of C. reinhardtii. was constructed. The vector consists of a DNA fragment from the chromosome of C. reinhardtii which spans the region of the psbF gene, upstream of which the spectinomycin-resistance-conferring aadA cassette was inserted. This vector was successfully used to transform wild type C. reinhardtii cells. The spectinomycin resistant strain thus obtained can grow autotrophically and does not show significant changes as compared to the wild-type strain in PSII activity. The following mutations have been introduced in the psbF gene: H23M; H23Y; W19L and W19. The replacement of H23 involved in the heme binding to M and Y was meant to permit heme binding but eventually alter some or all of the electron transport properties of the mutated cytochrome. Tryptophane W19, a strictly conserved residue, is proximal to the heme and may interact with the tetrapyrole ring. Therefore its replacement may effect the heme properties. A change to tyrosine may have a lesser affect on the potential or electron transfer rate while a replacement of W19 by leucine is meant to introduce a more prominent disturbance in these parameters. Two of the mutants, FW19L and FH23M have segregated already and are homoplasmic. The rest are still grown under selection conditions until complete segregation will be obtained. All mutants contain assembled and functional PSII exhibiting an increased sensitivity of PSII to the light. Work is still in progress for the detailed characterization of the mutants PSII properties. A tobacco mutant, S6, obtained by Maliga and coworkers harboring the F26S mutation in the b subunit was made available to us and was characterized. Measurements of PSII charge separation and recombination, polypeptide content and electron flow indicates that this mutation indeed results in light sensitivity. Presently further work is in progress in the detailed characterization of the properties of all the above mutants. Information was obtained demonstrating that photoinactivation of PSII in vivo initiates a series of progressive changes in the properties of RCII which result in an irreversible modification of the RCII-D1 protein leading to its degradation and replacement. The cleavage process of the modified RCII-D1 protein is regulated by the occupancy of the QB site of RCII by plastoquinone. Newly synthesized D1 protein is not accumulated in a stable form unless integrated in reassembled RCII. Thus the degradation of the irreversibly modified RCII-D1 protein is essential for the recovery process. The light induced degradation of the RCII-D1 protein is rapid in mutants lacking the pD1 processing protease such as in the LF-1 mutant of the unicellular alga Scenedesmus obliquus. In this case the Mn binding site of PSII is abolished, the water oxidation process is inhibited and harmful cation radicals are formed following light induced electron flow in PSII. In such mutants photo-inactivation of PSII is rapid, it is not protected by ligands binding at the QB site and the degradation of the inactivated RCII-D1 occurs rapidly also in the dark. Furthermore the degraded D1 protein can be replaced in the dark in absence of light driven redox controlled reactions. The replacement of the RCII-D1 protein involves the de novo synthesis of the precursor protein, pD1, and its processing at the C-terminus end by an unknown processing protease. In the frame of this work, a gene previously isolated and sequenced by Dr. Pakrasi's group has been identified as encoding the RCII-pD1 C-terminus processing protease in the cyanobacterium Synechocystis sp. PCC 6803. The deduced sequence of the ctpA protein shows significant similarity to the bovine, human and insect interphotoreceptor retinoid-binding proteins. Results obtained using C. reinhardtii cells exposes to low light or series of single turnover light flashes have been also obtained indicating that the process of RCII-D1 protein turnover under non-photoinactivating conditions (low light) may be related to charge recombination in RCII due to back electron flow from the semiquinone QB- to the oxidised S2,3 states of the Mn cluster involved in the water oxidation process.
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Full-wave Simulations of ICRF Heating in Toroidal Plasma with Non-Maxwellian Distribution Functions in the FLR Limit. Office of Scientific and Technical Information (OSTI), July 2007. http://dx.doi.org/10.2172/962732.

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