ZIB

1

Electronic Resource

Investigation of the creation process in dc pulsed discharges (1990)

Dengra, A. ; Ballesteros, J. ; Hernández, M. A. ; [et al.]

[S.l.] : American Institute of Physics (AIP)

Journal of Applied Physics 68 (1990), S. 5507-5510

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ISSN: 1089-7550

Source: AIP Digital Archive

Topics: Physics

Notes: In this paper we study the creation process of a cylindrical pulsed argon plasma. A new numerical model to simulate the plasma evolution during the creation process has been developed. This model is based on the solution of the continuity equations for ions and electrons together with the Poisson's equation. The good agreement obtained between numerical and experimental results of electron density as a function of the time confirms the validity of the hypothesis made in the model proposed.

Type of Medium: Electronic Resource

URL: http://dx.doi.org/10.1063/1.347009

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2

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A new smoothing method for obtaining the electron energy distribution function in plasmas by the numerical differentiation of the I-V probe characteristic (1995)

Fernández Palop, J. I. ; Ballesteros, J. ; Colomer, V. ; [et al.]

[S.l.] : American Institute of Physics (AIP)

Review of Scientific Instruments 66 (1995), S. 4625-4636

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ISSN: 1089-7623

Source: AIP Digital Archive

Topics: Physics , Electrical Engineering, Measurement and Control Technology

Notes: A new smoothing method has been used to obtain the electron energy distribution function (EEDF) in plasmas by evaluating the second derivative of the I-V characteristic of a probe inmersed in the plasma. The smoothing method is based on the use of the instrument function. A comparison with other smoothing techniques has permitted us to show the advantages in using the new smoothing method. The experimental setup used to measure the I-V probe characteristic fast and accurately is also presented. The smoothing method was tested by measuring the EEDF in an argon dc discharge at different conditions of the gas pressure and discharge current. The plasma parameters (electron density and temperature) evaluated from the EEDF were compared with those evaluated by using other classic diagnostic methods obtaining a quite good consistency among them. © 1995 American Institute of Physics.

Type of Medium: Electronic Resource

URL: http://dx.doi.org/10.1063/1.1145300

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3

Electronic Resource

Transient processes in an Ar+I2 dc discharge (1996)

Fernández Palop, J. I. ; Ballesteros, J. ; Colomer, V. ; [et al.]

[S.l.] : American Institute of Physics (AIP)

Journal of Applied Physics 80 (1996), S. 4282-4291

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ISSN: 1089-7550

Source: AIP Digital Archive

Topics: Physics

Notes: The experimental results obtained in an Ar+I2 dc discharge during a transient process in which the iodine concentration decreases with time are presented. The following quantities have been measured during the process: electron energy distribution function, electron density and temperature, plasma potential and floating potentials. The temporal evolution of such quantities is analyzed. A transition from electronegative to electropositive plasma is observed. The floating potential values measured during the process are compared with those obtained from a theoretical model, obtaining a quite good consistency between both values. The floating potential is shown to be a powerful tool in the analysis of electronegative plasmas. © 1996 American Institute of Physics.

Type of Medium: Electronic Resource

URL: http://dx.doi.org/10.1063/1.363388

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4

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Sheath structure in a plane probe inmersed in an electronegative plasma (1995)

Fernández Palop, J. I. ; Ballesteros, J. ; Colomer, V. ; [et al.]

[S.l.] : American Institute of Physics (AIP)

Journal of Applied Physics 77 (1995), S. 2937-2944

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ISSN: 1089-7550

Source: AIP Digital Archive

Topics: Physics

Notes: The sheath zone near a plane probe inmersed in an electronegative plasma is analyzed. A theoretical model for the sheath zone was used to derive a new expression for the Bohm criterion. The new expression holds at any negative probe potential. Solving the model equations allows one to obtain a wealth of information including the spatial distribution of various quantities (electric field, potential, and particle densities), the sheath thickness, and the floating potential. © 1995 American Institute of Physics.

Type of Medium: Electronic Resource

URL: http://dx.doi.org/10.1063/1.358709

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5

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Experimental study of the ionization front in pulsed-surface-wave-produced plasmas (1989)

Gamero, A. ; Sola, A. ; Cotrino, J. ; [et al.]

[S.l.] : American Institute of Physics (AIP)

Journal of Applied Physics 65 (1989), S. 2199-2204

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ISSN: 1089-7550

Source: AIP Digital Archive

Topics: Physics

Notes: The advance of the ionization front along the plasma column is studied during the formation process of plasmas produced by a surface wave. The experimental measurements have been performed in argon gas, for the 0.1–30-Torr pressure range, using pulsed microwave power at 2.45 GHz. The ionization front velocity decreases along the plasma column, from its maximum value at the launcher to the zero value at the stationary plasma column end, similarly to the surface-wave power diminution. This velocity can be expressed to depend only on the product collision frequency times tube radius and the surface-wave incident power along the plasma column.

Type of Medium: Electronic Resource

URL: http://dx.doi.org/10.1063/1.342830

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6

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Reexamination of recent experimental results in surface-wave-produced argon plasmas at 2.45 GHz: Comparison with the diffusion-recombination model results (1988)

Sola, A. ; Gamero, A. ; Cotrino, J. ; [et al.]

[S.l.] : American Institute of Physics (AIP)

Journal of Applied Physics 64 (1988), S. 3419-3423

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ISSN: 1089-7550

Source: AIP Digital Archive

Topics: Physics

Notes: In this paper we comment on recently reported experimental data about some characteristic magnitudes of plasma columns produced and maintained by surface microwaves. We then compare them with theoretical values obtained from the diffusion-recombination model of Mateev, Zhelyazkov, and Atanassov [J. Appl. Phys. 54, 3049 (1988)] and Zhelyazkov, Benova, and Atanassov [J. Appl. Phys. 59, 1466 (1986)] for the same magnitudes, in a wide range of operating conditions. Such a comparison allows us to make conclusions about the results of the model and its hypothesis.

Type of Medium: Electronic Resource

URL: http://dx.doi.org/10.1063/1.341497

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7

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Gene structure and map location of the murine homolog of the Huntington-associated protein, Hap1 (1998)

Nasir, J. ; Duan, K. ; Nichol, K. ; [et al.]

Springer

Mammalian genome 9 (1998), S. 565-570

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ISSN: 1432-1777

Source: Springer Online Journal Archives 1860-2000

Topics: Biology , Medicine

Notes: Abstract. Huntington's Disease (HD) is an inherited progressive neurodegenerative disorder associated with a mutation in a gene expressed in both affected and non-affected tissues. The selective neuropathology in HD is thought to be mediated in part through interactions with other proteins including the Huntington Associated Protein, HAP-1, which is predominantly expressed in the brain. We have mapped its murine homolog, Hap1, to mouse Chr 11 (band D), which shares extensive synteny with human Chr 17 including the region 17q21–q22, where the gene for `frontotemporal dementia and parkinsonism linked to chromosome 17' has bee mapped. In addition, we have sequenced a 21,984 base pair (bp) genomic clone encompassing the entire Hap1 gene. It is organized as 11 exons and flanked by exons from potentially one or more novel genes. At least three Hap1 transcripts (Hap1-A; Hap1-B; Hap1-C) can be formed by alternative splicing at the 3′ end of the gene leading to protein isoforms with novel C-termini.

Type of Medium: Electronic Resource

URL: http://dx.doi.org/10.1007/s003359900819

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