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  • AIP Publishing  (19)
  • 1975-1979  (19)
Type of Medium
Publisher
  • AIP Publishing  (19)
Person/Organisation
Language
Years
  • 1975-1979  (19)
Year
Subjects(RVK)
  • 1
    Online Resource
    Online Resource
    Uniform trapping in heat−treated magnesium phthalocyanine sandwich cells
    AIP Publishing ; 1975
    In:  Journal of Applied Physics Vol. 46, No. 2 ( 1975-02-01), p. 863-866
    Details
    In: Journal of Applied Physics, AIP Publishing, Vol. 46, No. 2 ( 1975-02-01), p. 863-866
    Abstract: Current−voltage dependencies characteristic of uniform trapping are observed in magnesium phthalocyanine sandwich cells with silver electrodes. Annealing the samples promotes them from an α to β phase involving an increase in resistivity of four orders of magnitude which may be attributable to the mobility. The resulting parameters of the system are a Fermi level of 0.373 eV above the valence band, a trap concentration of 2.09×1017/cm3 eV, and a mobility−density−of−states product of 4.22×1011 (cm V sec)−1.
    Type of Medium: Online Resource
    ISSN: 0021-8979 , 1089-7550
    URL: Article
    DOI: 10.1063/1.321604
    Language: English
    Publisher: AIP Publishing
    Publication Date: 1975
    detail.hit.zdb_id: 220641-9
    detail.hit.zdb_id: 3112-4
    detail.hit.zdb_id: 1476463-5
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  • 2
    Online Resource
    Online Resource
    Neutron radiographs using the ionographic process
    AIP Publishing ; 1978
    In:  Journal of Applied Physics Vol. 49, No. 10 ( 1978-10-01), p. 5078-5080
    Details
    In: Journal of Applied Physics, AIP Publishing, Vol. 49, No. 10 ( 1978-10-01), p. 5078-5080
    Abstract: Thermal neutron radiographs have been made using ionographic techniques. With a fluence of 107 neutrons/cm2 at the image plane, image resolution of three line pairs per mm was demonstrated. The apparatus for these demonstration experiments is described, and alternative modes of operation are discussed. It appears possible to make ionographic neutron radiographs using a transmitted fluence of 106 neutrons/cm2.
    Type of Medium: Online Resource
    ISSN: 0021-8979 , 1089-7550
    URL: Article
    DOI: 10.1063/1.324452
    Language: English
    Publisher: AIP Publishing
    Publication Date: 1978
    detail.hit.zdb_id: 220641-9
    detail.hit.zdb_id: 3112-4
    detail.hit.zdb_id: 1476463-5
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  • 3
    Online Resource
    Online Resource
    Lower hybrid parametric instabilities—Nonuniform pump waves and tokamak applications
    AIP Publishing ; 1977
    In:  The Physics of Fluids Vol. 20, No. 11 ( 1977-11-01), p. 1864-1875
    Details
    In: The Physics of Fluids, AIP Publishing, Vol. 20, No. 11 ( 1977-11-01), p. 1864-1875
    Abstract: Electrostatic lower hybrid ’’pump’’ waves are often launched into tokamak plasmas by structures (e.g., waveguides) whose dimensions are considerably smaller than characteristic plasma sizes. Such waves propagate in well-defined resonance cones and give rise to parametric instabilities driven by electron E×B velocities. The finite size of the resonance cone region determines the threshold for both convective quasi-mode decay instabilities and absolute instabilities. The excitation of absolute instabilities depends on whether a traveling or standing wave pump model is used; traveling wave pumps require the daughter waves to have a definite frequency shift. Altogether, parametric instabilities driven by E×B velocities occur for threshold fields significantly below the threshold for filamentation instabilities driven by pondermotive forces. Applications to tokamak heating show that nonlinear effects set in when a certain power-per-wave-launching port is exceeded. For sufficiently high powers, these instabilities will occur in the low-density edge region of a tokamak. They are characterized by a daughter wave frequency 10% below the pump wave frequency, in agreement with experimental observations.
    Type of Medium: Online Resource
    ISSN: 0031-9171
    URL: Article
    DOI: 10.1063/1.861804
    Language: English
    Publisher: AIP Publishing
    Publication Date: 1977
    detail.hit.zdb_id: 1472743-2
    detail.hit.zdb_id: 241528-8
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  • 4
    Online Resource
    Online Resource
    High-precision measurement and control facility for electrical-resistivity experiments in an He i i environment
    AIP Publishing ; 1978
    In:  Review of Scientific Instruments Vol. 49, No. 3 ( 1978-03-01), p. 356-358
    Details
    In: Review of Scientific Instruments, AIP Publishing, Vol. 49, No. 3 ( 1978-03-01), p. 356-358
    Abstract: A control and measurement system is described that provides direct digital output of the electrical resistance of a metal sample with an uncertainty of ⩽5×10−9 Ω at 1.7 K with a linearity of ±0.04%. In addition, the system allows in situ isochronal and isothermal annealing experiments to be performed with ΔT⩽0.1°C and Δt⩽3 s between any two temperatures. With the exception of two commerical instruments, all devices were made with readily available components.
    Type of Medium: Online Resource
    ISSN: 0034-6748 , 1089-7623
    URL: Article
    DOI: 10.1063/1.1135406
    Language: English
    Publisher: AIP Publishing
    Publication Date: 1978
    detail.hit.zdb_id: 209865-9
    detail.hit.zdb_id: 1472905-2
    SSG: 11
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  • 5
    Online Resource
    Online Resource
    Preliminary study for the construction of a low-energy electron-diffraction apparatus using a high-tension source
    AIP Publishing ; 1977
    In:  Journal of Applied Physics Vol. 48, No. 12 ( 1977-12-01), p. 5027-5032
    Details
    In: Journal of Applied Physics, AIP Publishing, Vol. 48, No. 12 ( 1977-12-01), p. 5027-5032
    Abstract: This paper is a study towards the construction of a low-energy electron-diffraction apparatus using a Johansson objective for its optical system. A theoretical study in Gaussian approximation shows that the diffraction pattern is formed in the focus plane of the objective; its dimensions do not depend on the electron energy. By computing courses of electron trajectories, a more accurate investigation is carried out. A variation of 100 eV in electron energy induces broadening less than 7% in the diffraction pattern. The size of each spot in the pattern is lower than 0.6 mm, while the aperture of the primary beam is lower than 1.6 mm. The objective is shown to carry out by itself the filtering of the secondary electrons, the better this filtering the smaller the aperture radius. This study points out important advantages in using this device for the diffraction of low-energy electrons—advantages which were first perceived in preliminary experiments.
    Type of Medium: Online Resource
    ISSN: 0021-8979 , 1089-7550
    URL: Article
    DOI: 10.1063/1.323552
    Language: English
    Publisher: AIP Publishing
    Publication Date: 1977
    detail.hit.zdb_id: 220641-9
    detail.hit.zdb_id: 3112-4
    detail.hit.zdb_id: 1476463-5
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  • 6
    Online Resource
    Online Resource
    In-cavity hot cell for use with sequence CO2 lasers
    AIP Publishing ; 1977
    In:  Review of Scientific Instruments Vol. 48, No. 8 ( 1977-08-01), p. 1031-1033
    Details
    In: Review of Scientific Instruments, AIP Publishing, Vol. 48, No. 8 ( 1977-08-01), p. 1031-1033
    Abstract: A technique is described for approximately doubling the number of laser lines obtainable from cw CO2 lasers. This technique involves the use of an in-cavity cell containing hot CO2. Construction details are given of a suitable cell which attains gas temperatures as high as 500° C.
    Type of Medium: Online Resource
    ISSN: 0034-6748 , 1089-7623
    URL: Article
    DOI: 10.1063/1.1135177
    Language: English
    Publisher: AIP Publishing
    Publication Date: 1977
    detail.hit.zdb_id: 209865-9
    detail.hit.zdb_id: 1472905-2
    SSG: 11
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  • 7
    Online Resource
    Online Resource
    Magnetoresistance of Pd3Fe and PdFe
    AIP Publishing ; 1979
    In:  Journal of Applied Physics Vol. 50, No. B3 ( 1979-03-01), p. 1907-1909
    Details
    In: Journal of Applied Physics, AIP Publishing, Vol. 50, No. B3 ( 1979-03-01), p. 1907-1909
    Abstract: The ferromagnetic anisotropy of resistivity Δρ/ρ0= (ρ∥-ρ⊥)/ρ0 of the alloy Pd70Fe30 has been measured below 295 K, for each of five different thermal treatments. At 4.2 K, Δρ/ρ0 reaches 9.4% in the atomically ordered state (of Pd3Fe type), but is only 5.4% in the disordered state. In Pd75Fe25, the effect of ordering on Δρ/ρ0 is much smaller than in Pd70Fe30, and has the opposite sign. A similar sign reversal with varying iron concentration has been observed earlier in the Ni-Fe series. Most features of our Δρ/ρ0 data, including the sign reversal, can be explained on the basis of the well-known linear relation between Δρ/ρ0 and the ratio ρ↓/ρ↑ of the resistivities for spin-down and spin-up 4s electrons. In Pd50Fe50, ordering (of PdFe type) has little effect on Δρ/ρ0. At 295 K, where phonon scattering dominates over impurity scattering, Δρ/ρ0 is always smaller than 1% in all samples.
    Type of Medium: Online Resource
    ISSN: 0021-8979 , 1089-7550
    URL: Article
    DOI: 10.1063/1.327160
    Language: English
    Publisher: AIP Publishing
    Publication Date: 1979
    detail.hit.zdb_id: 220641-9
    detail.hit.zdb_id: 3112-4
    detail.hit.zdb_id: 1476463-5
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  • 8
    Online Resource
    Online Resource
    Photostimulated exoelectron emission from ultrahigh vacuum quenched platinum wires
    AIP Publishing ; 1975
    In:  Journal of Applied Physics Vol. 46, No. 6 ( 1975-06-01), p. 2354-2360
    Details
    In: Journal of Applied Physics, AIP Publishing, Vol. 46, No. 6 ( 1975-06-01), p. 2354-2360
    Abstract: High-purity platinum wires were radiation quenched from high temperature at pressures below 5×10−10 Torr. The electron emission induced by uv illumination was measured during subsequent isochronal annealing cycles. When compared with the electron emission of well-annealed Pt wires it is found that increased emission occurs in the quenched samples after annealing in the temperature regime 350–550 °C. A model based upon monovacancy diffusion kinetics and vacancy-enhanced solute diffusion agrees with the experimentally determined annealing kinetics.
    Type of Medium: Online Resource
    ISSN: 0021-8979 , 1089-7550
    URL: Article
    DOI: 10.1063/1.321913
    Language: English
    Publisher: AIP Publishing
    Publication Date: 1975
    detail.hit.zdb_id: 220641-9
    detail.hit.zdb_id: 3112-4
    detail.hit.zdb_id: 1476463-5
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  • 9
    Online Resource
    Online Resource
    Piezoelectric driven Kelvin probe for contact potential difference studies
    AIP Publishing ; 1976
    In:  Review of Scientific Instruments Vol. 47, No. 7 ( 1976-07-01), p. 840-842
    Details
    In: Review of Scientific Instruments, AIP Publishing, Vol. 47, No. 7 ( 1976-07-01), p. 840-842
    Abstract: A convenient piezoelectric driven Kelvin probe for the measurement of work function changes is described. The probe has a simple construction, is small, bakeable, and can be mounted on any 35-mm-i.d. UHV flange. As the piezoelectric device is inside the vacuum chamber, only one electrical feedthrough is needed for operating the probe. The distance between reference electrode and sample can be varied within ±0.5 mm simply by applying a dc voltage to the piezoelectric device in addition to the ac oscillator-driving voltage, not requiring any mechanical driving and feedthrough provisions. The probe was tested studying the adsorption of O2 on Pt(111). The sensitivity for contact potential measurements is better than 0.1 mV at a response time of 10 sec.
    Type of Medium: Online Resource
    ISSN: 0034-6748 , 1089-7623
    URL: Article
    DOI: 10.1063/1.1134750
    Language: English
    Publisher: AIP Publishing
    Publication Date: 1976
    detail.hit.zdb_id: 209865-9
    detail.hit.zdb_id: 1472905-2
    SSG: 11
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  • 10
    Online Resource
    Online Resource
    Homothetic and conformal motions in spacelike slices of solutions of Einstein’s equations
    AIP Publishing ; 1976
    In:  Journal of Mathematical Physics Vol. 17, No. 7 ( 1976-07-01), p. 1268-1273
    Details
    In: Journal of Mathematical Physics, AIP Publishing, Vol. 17, No. 7 ( 1976-07-01), p. 1268-1273
    Abstract: Components of Killing’s equation are used to obtain constraints satisfied in a spacelike hypersurface by the intrinsic metric and extrinsic curvature in the presence of a spacetime conformal motion for a solution of Einstein’s equations. If the conformal motion is either a homothetic motion or a motion, it is shown that these Killing constraints are preserved by the Einstein evolution equations. It is then shown that the generator of the homothetic motion (homothetic Killing vector) can be constructed if the Killing constraints are satisfied by a set of initial data. It is shown that a homothetic motion in the intrinsic metric is a spacetime homothetic motion if the extrinsic curvature is transformed correctly under the spatial homothetic motion. Further restrictions on a proper conformal motion due to the fact that it is not identically a curvature collineation are obtained. Restrictions on the matter–stress–energy tensor are discussed. Examples are presented.
    Type of Medium: Online Resource
    ISSN: 0022-2488 , 1089-7658
    URL: Article
    DOI: 10.1063/1.523052
    RVK:
    UA 4660
    Language: English
    Publisher: AIP Publishing
    Publication Date: 1976
    detail.hit.zdb_id: 1472481-9
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