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Thursday, July 23, 2020 | History

2 edition of Enhanced diffusion due to electrons, protons and quenching. found in the catalog.

Enhanced diffusion due to electrons, protons and quenching.

W. SchuМ€le

Enhanced diffusion due to electrons, protons and quenching.

by W. SchuМ€le

  • 319 Want to read
  • 27 Currently reading

Published by Commission of the European Communities in Luxembourg .
Written in English


Edition Notes

SeriesNuclear science and technology
ID Numbers
Open LibraryOL14937063M
ISBN 100119717565

Rong Wang's 13 research works with 37 citations and reads, including: Electroluminescence analysis of VOC degradation of individual subcell in GaInP/GaAs/Ge space solar cells irradiated by   The quenching fluence threshold is computed by sampling ion tracks to resemble different fluences. The quenching between two parallel MeV proton tracks in the BCF scintillator is investigated in figure 8, where the spatial distance between the two tracks is shown on the abscissa, and the ordinate shows the time between the two protons.

Hence the plasma during this period consists of neutrons, protons, electrons, muons and neutrinos. Due to the decay of the hyperons, the muon component of the inhomogeneities will be very high.   The electrons are cooler than the protons in fast wind (T e = – MK and T p = – MK at 0. 3 AU), but hotter in slow wind, which is more variable in abundance, more compressive and comparatively cold, with all particle temperatures becoming minimal at the HCS (T p = 5 × 10 4 K at 1 AU). The fast wind is permeated by Alfvén waves.

The displacement may be due to translation of the molecule by a chemical, electrical, or gravitational gradient. It might be an organized, en masse displacement of many molecules, as in blood or CSF flow. Or it might be an entirely random process due to microscopic diffusion, the thermally-induced displacements of molecules due to Brownian motion. At energies of – keV, the electrons experience fast transport across the slot region due to the dominance of radial diffusion; at energies of – keV, the electrons gradually diffuse and decay in the slot region due to the comparable rate of radial diffusion and pitch angle scattering by plasmaspheric hiss; at energies of E >


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Enhanced diffusion due to electrons, protons and quenching by W. SchuМ€le Download PDF EPUB FB2

- it was found that the ordering rate in copper % zinc alloys is determined by an interstitialcy diffusion mechanism during irradiation with high energy particles and by a vacancy diffusion mechanism during annealing after migration activation energies of interstitials and of vacancies were found to be e1i(m) = ev and e1v(m) = ev, respectively.

Results of investigations of radiation enhanced diffusion in Cu% Zn alloys using MeV protons are reported and compared with results obtained for 2 MeV electrons. The activation energy of diffusion decreases considerably from eV to eV for displacement rates increasing from 3 × 10 −12 dpas −1 to × 10 −8 dpas −1, i Cited by: 1.

Enhanced Diffusion Due to Electrons, Protons and Quenching. By SCHUELE Wolfgang. Abstract. ENERGY OF THE ORDERING RATE, AFTER QUENCHING FROM DEGREES C IN WATER. USING MEV PROTONS ARE REPORTED AND COMPARED WITH RESULTS OBTAINED FOR 2 MEV ELECTRONS.

Author: SCHUELE Wolfgang. D Frankfurt am Main 1, Germany Abstract Results of investigations of the diffusion rate of Enhanced diffusion due to electrons chromium alloys after plastic deformation, after quenching from and fromand during irradiation with 18 MeV protons and MeV electrons arc by: 6.

Constant-current discharge curves for the nickel hydroxide electrode are simulated assuming resistances due to diffusion of protons and conduction of electrons through the nickel hydroxide film, and charge-transfer resistance at the film/electrolyte interface contribute to the polarization losses of the electrode.

Good qualitative agreement is observed between the model predictions and Cited by:   In calculation of quenching factors, we follow Birks approach in description of quenching of the light yield for highly ionizing particles.Light yield of scintillating material depends not only on energy of particle E but also on how big is its stopping power dE / dr in the material.

Fig. 1 gives example of stopping powers for electrons (calculated with the ESTAR software), and for protons. The effects of excess protons on the fluorescence quenching process of 1-naphtholsulfonate (1N4S) and 1-naphtholsulfonate (1N3S) in methanol-doped ice samples were studied by employing a.

due to capping ligands. These calculations suggest that movement of the protons rather than the electrons dominate the nonexponential kinetics of the PCET reaction. Thus, the impact of both bulk and surface properties of metal-oxide nanoparticles on proton conductivity should be considered when designing heterogeneous catalysts.

Birks' ionization quenching model and the energy deposition by secondary electrons (EDSE) model were used to correct the light captured by a prototype 3D scintillator detector. The detector was made of a 20 cm × 20 cm × 20 cm tank filled with liquid scintillator, and three cameras.

The radiolysis of water due to ionizing radiation results in the production of electrons, H atoms, OH radicals, H3O+ ions and molecules (dihydrogen H2 and hydrogen peroxide H2O2).

A brief history of the development of the understanding of water radiolysis is presented, with a focus on the H2 production. This H2 production is strongly modified at oxide surfaces.

A.D Johnstone, Pitch angle diffusion of low energy electrons and positive ions in the inner magnetosphere: A review of observations and theory, Advances in Space Research, /(95)F, 17, 10, (), (). The complete system for pyrylium-ion-mediated transport of electrons and hydroxide ions is illustrated in Fig.

entrifugation studies 4 have established that binding of ZnTPPS 4-to the. where the "short" diode expression was used for the capacitance associated with the excess charge due to electrons in the p-type region.

The "long" diode expression was used for the capacitance associated with the excess charge due to holes in the n-type diffusion constants and diffusion lengths equal. D n = m n x V t = cm 2 /s. MoS2 nanosheet-decorated TiO2 nanocomposites were prepared via facile liquid-phase exfoliation of natural molybdenite combined with in situ hydrolysis.

The large diffusion length of photoexcited electrons was. the strong quenching of the fluorescence of CN-rGOharvesting properties are due to the enhanced optical density. Due to the longer range of electrons generated by kV photon beams compared to proton irradiation (see figure 4), the GNPs in the media space can still contribute to direct DNA damage for kilovoltage photon irradiation.

This is not the case for proton therapy, where the cellular uptake is crucial to bring GNPs in close proximity to the nucleus. Moreover, the photogenerated electrons in the CB of HCN have an enhanced reduction capability due to the negative, downward shift of its CB.

Secondly, the electron transport property of HCN is enhanced by the methyl groups grafting to the bridging N atoms, which may induce the rearrangement of π-electrons.

The singlet exciton diffusion properties of solution-cast thin films prepared from mixed substituent monoiodophenyl or monobromophenyl derivatives of 5,10,15,tetrakis(4-carbomethoxyphenyl)porphyrin (TCM 4 PP) were investigated for use in solar energy conversion applications. The photoluminescent singlet decay lifetime PL(t) of pristine porphyrin films and films lightly doped (–% wt.

This paper reports an experimental and theoretical analysis of the diffusivity of electrons in Si as function of temperature, field strength, and field direction. Results for the longitudinal diffusion coefficient have been obtained experimentally for fields applied along 〈〉 and 〈〉 directions with time‐of‐flight and noise measurements.

A study of the precipitation of protons ( 35 MeV) and electrons ( - MeV) in the northern auroral zone based on the observations of EXOS-C satellite during reveals that the global peak flux profile follows the global minimum magnetic field profile with a full-width-at-half-maximum (FWFM) of approx 7 deg for the proton zone and approx 5 deg for the electron zone.

We use those diffusion rates in Figure 4 as input to solve a two-dimensional Fokker-Planck diffusion equation by a recently introduced hybrid difference method We calculate PSD evolution of protons due to EMIC waves and then simulate the evolution of differential flux j by the subsequent conversion j = p 2 there is currently no data for the variation of the differential flux.

The theory of runaway electrons on confined magnetic field lines is circumscribed by: (1) the number of energetic electrons remaining after a thermal quench, (2) the kinetic energy K r required by an electron to runaway, and (3) the change in the poloidal flux required for an e-fold in the number of energetic electrons.Protons carry an equal-magnitude charge that we call positive.

(See Figure ) Electron and proton charges are considered fundamental building blocks, since all other charges are integral multiples of those carried by electrons and protons. Electrons and protons are also two of the three fundamental building blocks of ordinary matter.