Zobrazeno 1 - 10 of 20 pro vyhledávání: '"H. K. Welsh"'
1
Dielectric relaxation in defect clusters in calcium fluoride doped with trivalent rare earths
Autor: H K Welsh
Publikováno v: Journal of Physics C: Solid State Physics. 18:5637-5640
After reviewing the available experimental data, structures are suggested for the defect clusters which are responsible for the dielectric relaxations known as RII and RIII in calcium fluoride doped with trivalent rare earth fluorides.
Externí odkaz: https://explore.openaire.eu/search/publication?articleId=doi_________::111361e67f37e182da44f0d3d7369b8a
https://doi.org/10.1088/0022-3719/18/29/014
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2
Low‐frequency permittivities of skarns and associated rocks
Autor: H. K. Welsh, D. W. Emerson
Publikováno v: GEOPHYSICS. 53:1233-1240
The lossy dielectric properties of dry heterogeneous skarns and associated rocks vary significantly when the real (ε′) and quadrature (ε″) permittivity responses are measured between 1 Hz and 160 kHz. Ores containing iron oxides and/or sulfides
Externí odkaz: https://explore.openaire.eu/search/publication?articleId=doi_________::16b1b17aee3a2944bd1df8b9567f353d
https://doi.org/10.1190/1.1442564
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3
Dielectric absorption and low-temperature ionic conduction in calcium fluoride doped with trivalent rare earths
Autor: H K Welsh
Publikováno v: Journal of Physics C: Solid State Physics. 18:5641-5649
The dependence on frequency f between 10 mHz and 100 kHz of dielectric absorption due to conduction processes in ytterbium-doped calcium fluoride in the temperature range 300K to 400K has been found to have the form Af-1+Bf-0.5. The first term is tha
Externí odkaz: https://explore.openaire.eu/search/publication?articleId=doi_________::e3d73c6b8f86841af625c87ab750c6b7
https://doi.org/10.1088/0022-3719/18/29/015
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4
Dielectric loss and EPR studies of CaF2:Gd3+
Autor: H K Welsh, A Edgar
Publikováno v: Journal of Physics C: Solid State Physics. 8:L336-L340
Dielectric loss measurements on CaF2:Gd3+ show four relaxation absorptions. By correlation with EPR the assignment of a relaxation with activation energy 0.396 eV to a tetragonal site is confirmed. Evidence against assignment of a relaxation with act
Externí odkaz: https://explore.openaire.eu/search/publication?articleId=doi_________::e53fb3a2b8af09af79d3961d0b2d07ae
https://doi.org/10.1088/0022-3719/8/15/008
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5
Some Physical Property Characteristics of Zeolitic Rock ? Preliminary Results
Autor: D.W. Emerson, H. K. Welsh
Publikováno v: Exploration Geophysics. 18:393-400
Clinoptilolite and mordenite and other zeolite bearing altered ignimbritic rocks have been subject to petrophysical laboratory studies in which textural, magnetic, and electrical properties were investigated. Zeolite-poor and barren rocks also were i
Externí odkaz: https://explore.openaire.eu/search/publication?articleId=doi_________::e76ed244f887d7c34d8e9b17c72358a0
https://doi.org/10.1071/eg987393
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7
Chain twisting in long-chain aliphatic compounds and polyethylene
Autor: H. K. Welsh
Publikováno v: Journal of Polymer Science Part A-1: Polymer Chemistry. 8:289-293
Rate parameters for dielectric relaxation and the thermal properties of long-chain molecular systems are shown to provide evidence for chain twisting at chain lengths shorter than previously suggested. Comparison of the temperatures of maximum absorp
Externí odkaz: https://explore.openaire.eu/search/publication?articleId=doi_________::327a6bd4162d74a2bc3670bd622ff559
https://doi.org/10.1002/pol.1970.150080201
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10
Binary Phase Diagrams for Mixtures by Long Chain Esters
Autor: H. K. Welsh
Publikováno v: Molecular Crystals and Liquid Crystals. 33:1-3
Binary phase diagrams for mixtures of the ester tetradecyl tetradecanoate with dodecyl octadecanoate, dodecyl hexadecanoate and dodecyl tetradecanoate and of dodecyl tetradecanoate with hexadecyl decanoate and tetradecyl dodecanoate are reported. The
Externí odkaz: https://explore.openaire.eu/search/publication?articleId=doi_________::f3ecbf1f11c2f2ba1e0294f90866b303
https://doi.org/10.1080/15421407608083864
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