ALBERT

All Library Books, journals and Electronic Records Telegrafenberg

X
feed icon rss

Your email was sent successfully. Check your inbox.

An error occurred while sending the email. Please try again.

Proceed reservation?

Export
  • 1
    Electronic Resource
    Electronic Resource
    Effects of secondary electrons due to ionization on model predictions of discharge-pumped XeCl laser (1996)
    [S.l.] : American Institute of Physics (AIP)
    Physics of Plasmas 3 (1996), S. 4225-4228 
    Details
    ISSN: 1089-7674
    Source: AIP Digital Archive
    Topics: Physics
    Notes: A self-consistent code has been utilized in modeling a discharge-pumped XeCl laser. The electron energy distribution function (EEDF) has been calculated using a time-dependent Boltzmann equation. The effects of the secondary electrons produced by ionization on EEDF, rate coefficients, species densities, laser energy, and breakdown delay time have been examined by comparing different models in a wide range of discharge parameters. Efforts have been made at explaining the discrepancy in the breakdown delay time between simulation and experiment. It is found that the secondary electrons due to ionization play an important role in determining the breakdown delay time. Furthermore, the measured breakdown delay time can be well reproduced using the model presented in this work instead of increasing the total excitation cross sections of xenon. © 1996 American Institute of Physics.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1063/1.871517
    Location Call Number Expected Availability
    BibTip Others were also interested in ...
    Paper (German National Licenses)
    Fulltext
  • 2
    Electronic Resource
    Electronic Resource
    Theoretical study on nonstationarity of electron energy distribution function for discharge-pumped XeCl laser (1996)
    [S.l.] : American Institute of Physics (AIP)
    Physics of Plasmas 3 (1996), S. 2813-2817 
    Details
    ISSN: 1089-7674
    Source: AIP Digital Archive
    Topics: Physics
    Notes: The nonstationarity of electron energy distribution function (EEDF) has been studied for a discharge-pumped XeCl laser, where a self-consistent model is considered. The energy relaxation time has been observed by solving a time-dependent Boltzmann equation. The importance of a nonstationary treatment in determining EEDF, electron average energy, electron-impact rate coefficients, and species densities has been discussed. It has been found that a pronounced nonstationarity is likely to occur at a relatively low electric field (〈 2 Td). The quasi-stationary treatment tends to underestimate the electron average energy and some electron-impact rate coefficients around the inversion points of the discharge voltage. Electron–electron collisions induce a strong nonstationarity when the electron density exceeds a certain value. The electron-impact rate coefficients selected by neglecting the nonstationarity result in an incorrect determination of species densities. © 1996 American Institute of Physics.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1063/1.871715
    Location Call Number Expected Availability
    BibTip Others were also interested in ...
    Paper (German National Licenses)
    Fulltext
  • 3
    Electronic Resource
    Electronic Resource
    Growth of arc in high-pressure, pulsed glow discharge by gas density depletion (2000)
    [S.l.] : American Institute of Physics (AIP)
    Journal of Applied Physics 88 (2000), S. 4531-4536 
    Details
    ISSN: 1089-7550
    Source: AIP Digital Archive
    Topics: Physics
    Notes: Effects of gas density depletion on arc formation of high-pressure, pulsed glow discharge have been investigated by eliminating the other factors which may affect the discharge stability, such as shock waves, residual ions, electrode heating, and discharge products. The gas density depletion has been simulated by utilizing a subsonic gas flow between the curved electrodes combined with a convergent nozzle and a divergent diffuser. A comparison has been made on the discharge in the aerodynamically created gas density depletion with the second discharge in the double-pulse discharge within a stable gas. We have found that the large gas density depletion, Δρ/ρ0∼−3.6% corresponding to a pulse repetition rate (PRR) of ∼50 Hz, tends to cause an arc-like filament or an arc without the shocks, ions, electrode heating, and products. However, the second discharge in the double-pulse discharge becomes an arc in much smaller gas density depletion (Δρ/ρ0∼−1.2% corresponding to PRR ∼3 Hz). Therefore, the collapse of high-pressure, pulsed glow discharge is most likely caused by some factor other than the gas density depletion. © 2000 American Institute of Physics.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1063/1.1314328
    Location Call Number Expected Availability
    BibTip Others were also interested in ...
    Paper (German National Licenses)
    Fulltext
  • 4
    Electronic Resource
    Electronic Resource
    Numerical and experimental studies on synthesis of ultrafine nanosize powders of AlN by ion beam evaporation (1999)
    [S.l.] : American Institute of Physics (AIP)
    Journal of Applied Physics 86 (1999), S. 5279-5285 
    Details
    ISSN: 1089-7550
    Source: AIP Digital Archive
    Topics: Physics
    Notes: Synthesis of ultrafine nanosize powders by ion beam evaporation (IBE) has been studied numerically and experimentally. Theoretical models have been developed, which involve such physical processes as beam-target interaction, plasma expansion, and the synthesis of powders. The macroscopic properties of the ultrafine powders have been predicted. As an application of our models, the macroscopic properties of AlN powders synthesized by IBE with an AlN target have been predicted. The energy density, pulse width, and spot size of the ion beam are 20 J/cm2, 70 ns, and 1 cm2, respectively. The main results have shown that the particle size distribution is log normal and that 70% of all particles exist between 20 and 40 nm. The average diameter and the specific surface area are ∼30 nm and ∼50 m2/g, respectively. Experimentally, the ultrafine AlN powders have been successfully synthesized by IBE, which has been verified by x-ray diffraction and transmission electron diffraction. Furthermore, particle size distributions have been obtained by transmission electron microscopy. The experimental results are found to be in a reasonable agreement with the numerical studies. © 1999 American Institute of Physics.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1063/1.371511
    Location Call Number Expected Availability
    BibTip Others were also interested in ...
    Paper (German National Licenses)
    Fulltext
  • 5
    Electronic Resource
    Electronic Resource
    Preparation and characteristics of ZnS thin films by intense pulsed ion beam (1988)
    [S.l.] : American Institute of Physics (AIP)
    Journal of Applied Physics 63 (1988), S. 968-970 
    Details
    ISSN: 1089-7550
    Source: AIP Digital Archive
    Topics: Physics
    Notes: A new deposition system has been developed for the preparation of ZnS thin films by an intense pulsed ion beam (1 MeV, 80 ns). The maximum beam-power density of ∼5 GW/cm2 is concentrated on ZnS, so that a high-temperature plasma is easily produced. The plasma composed of Zn and S expands to be deposited onto a substrate kept at room temperature. Clear evidence has been obtained on the production of polycrystalline ZnS thin films with hexagonal structure. The deposition rate is estimated to be ∼108 A(ring)/s, which is several orders of magnitude higher than with any other method.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1063/1.340044
    Location Call Number Expected Availability
    BibTip Others were also interested in ...
    Paper (German National Licenses)
    Fulltext
  • 6
    Electronic Resource
    Electronic Resource
    Diagnosis of high-brightness ion beams produced in point pinch diodes (1996)
    [S.l.] : American Institute of Physics (AIP)
    Journal of Applied Physics 80 (1996), S. 4813-4818 
    Details
    ISSN: 1089-7550
    Source: AIP Digital Archive
    Topics: Physics
    Notes: Diagnosis and evaluation have been carried out of the ion beam and anode plasma produced in a "point pinch diode.'' From the measurement of a highly resolved Thomson-parabola mass spectrometer, the ions accelerated in the diode gap contain (a) protons, (b) highly ionized carbon and oxygen ions, and (c) singly ionized medium mass ions such as carbon, oxygen, CO+2, OH+, H2O+. Time-integrated x-ray and particle pinhole images show the spot size of the electron beam on the plasma to be less than 0.5 mm in diameter, in which fine structures are found with size less than 0.1 mm. A Kα satellite line of Al V is observed with a crystal spectrograph, which indicates the existence of Al4+ in the plasma. © 1996 American Institute of Physics.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1063/1.363522
    Location Call Number Expected Availability
    BibTip Others were also interested in ...
    Paper (German National Licenses)
    Fulltext
  • 7
    Electronic Resource
    Electronic Resource
    Numerical analysis on temperature dependence of XeCl-lasing characteristics (1993)
    Woodbury, NY : American Institute of Physics (AIP)
    Applied Physics Letters 63 (1993), S. 1313-1315 
    Details
    ISSN: 1077-3118
    Source: AIP Digital Archive
    Topics: Physics
    Notes: The recombination rate constants for Xe++Cl−+Ne→XeCl*+Ne and NeXe+ +Cl−+Ne→XeCl*+2Ne have been calculated in a temperature range of 100–400 K. At 7.34×1019 cm−3 of gas density, both rate constants of the recombinations are found to increase to ∼7.5×10−6 cm3/s at 120 K, a factor of ∼4 higher than that at room temperature. The temperature dependence of XeCl-lasing characteristics has also been simulated by a steady-state kinetic-simulation code. The simulation has indicated not only the enhancement of the laser output, but also the reduction of the halogen concentration in the lower temperature range.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1063/1.109715
    Location Call Number Expected Availability
    BibTip Others were also interested in ...
    Paper (German National Licenses)
    Fulltext
  • 8
    Electronic Resource
    Electronic Resource
    Ceramic Membrane Filter Using Ultrafine Powders (2001)
    Westerville, Ohio : American Ceramics Society
    Journal of the American Ceramic Society 84 (2001), S. 0 
    Details
    ISSN: 1551-2916
    Source: Blackwell Publishing Journal Backfiles 1879-2005
    Topics: Mechanical Engineering, Materials Science, Production Engineering, Mining and Metallurgy, Traffic Engineering, Precision Mechanics , Physics
    Notes: A ceramic membrane filter was developed by depositing ultrafine powders onto a porous substrate. The powders, having an average particle size of tens of nanometers, were produced by a newly developed technology, pulsed wire discharge: The carrier gas was pumped through the porous substrate, which had been heated to 500°–700°C, so that the powders could be sintered on the substrate surface, resulting in a membrane filter. Gas separation experiments were conducted using this filter. The experimental results showed a ratio of gas permeation very close to that given by the Knudsen flow.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1111/j.1151-2916.2001.tb00977.x
    Location Call Number Expected Availability
    BibTip Others were also interested in ...
    Paper (German National Licenses)
    Fulltext
  • 9
    Electronic Resource
    Electronic Resource
    Synthesis of Nanosized Aluminum Nitride Powders by Pulsed Laser Ablation (2000)
    Westerville, Ohio : American Ceramics Society
    Journal of the American Ceramic Society 83 (2000), S. 0 
    Details
    ISSN: 1551-2916
    Source: Blackwell Publishing Journal Backfiles 1879-2005
    Topics: Mechanical Engineering, Materials Science, Production Engineering, Mining and Metallurgy, Traffic Engineering, Precision Mechanics , Physics
    Notes: The influence of the target material, fluence, laser wavelength, and nitrogen pressure on the synthesis of AlN nanosized powders via reactive laser ablation has been investigated. Using infrared laser radiation and fluences of ≥11 J/cm2, pure AlN nanosized powders were produced at nitrogen pressures of ≥1.3 kPa via ablation of an AlN target and ≥13.3 kPa via ablation of an aluminum target. With ultraviolet laser radiation, AlN powders could be synthesized at a lower fluence (9 J/cm2 at a pressure of 8 kPa). The mean powder size was 7.5−15 nm.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1111/j.1151-2916.2000.tb01604.x
    Location Call Number Expected Availability
    BibTip Others were also interested in ...
    Paper (German National Licenses)
    Fulltext
  • 10
    Electronic Resource
    Electronic Resource
    Nanosize Powders of Aluminum Nitride Synthesized by Pulsed Wire Discharge (2003)
    Westerville, Ohio : American Ceramics Society
    Journal of the American Ceramic Society 86 (2003), S. 0 
    Details
    ISSN: 1551-2916
    Source: Blackwell Publishing Journal Backfiles 1879-2005
    Topics: Mechanical Engineering, Materials Science, Production Engineering, Mining and Metallurgy, Traffic Engineering, Precision Mechanics , Physics
    Notes: Nanosize particles of aluminum nitride have been successfully synthesized by a pulsed wire discharge (PWD). Intense pulsed current through an aluminum wire evaporated the wire to produce a high-density plasma. The plasma was then cooled by an ambient gas mixture of NH3/N2, resulting in nitridation. As a result, nanosize particles of aluminum nitride were formed. The average particle diameter was found to be ∼28 nm with a geometric standard deviation of 1.29. The maximum AlN content of 97% in the powders was achieved by optimizing various parameters: the gas pressure, the ratio of NH3 and N2, the wire diameter, the pulse width, and the input electrical energy. The ratio of the AlN powder production to the electrical energy consumption was evaluated as ∼40 g/(kW·h). Thus, PWD is a very efficient and promising method to synthesize nanosize powders of AlN.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1111/j.1151-2916.2003.tb03315.x
    Location Call Number Expected Availability
    BibTip Others were also interested in ...
    Paper (German National Licenses)
    Fulltext
Close ⊗
This website uses cookies and the analysis tool Matomo. More information can be found here...