Zobrazeno 1 - 7
of 7
pro vyhledávání: '"Ralph A. Hewes"'
Publikováno v:
Review of Progress in Quantitative Nondestructive Evaluation ISBN: 9781461377252
The standard for sensitive detection and resolution of defects in metal components is scanned focused immersion inspection to produce C-scans. Laser ultrasound, although successfully applied to composite inspection, has previously not produced compar
Externí odkaz:
https://explore.openaire.eu/search/publication?articleId=doi_________::1c58816851227e430114563d281334d1
https://doi.org/10.1007/978-1-4615-5947-4_73
https://doi.org/10.1007/978-1-4615-5947-4_73
Autor:
Ralph A. Hewes, M.V. Hoffman
Publikováno v:
Journal of Luminescence. 3:261-280
The emission from Eu 2+ , which is isoelectronic to Gd 3+ , in all previously investigated systems consists of a broad (R~ 2000 cm -1 band, which at low temperatures may be accompanied by a zero-phonon line. We have discovered a group of compounds in
Externí odkaz:
https://explore.openaire.eu/search/publication?articleId=doi_________::0374fdc3c1d534a1f9b738e628e0dae3
https://doi.org/10.1016/0022-2313(71)90064-0
https://doi.org/10.1016/0022-2313(71)90064-0
Publikováno v:
Physical Review B. 7:1657-1667
Externí odkaz:
https://explore.openaire.eu/search/publication?articleId=doi_________::ebc9785fa1502c9bd0d142c816c0a5cf
https://doi.org/10.1103/physrevb.7.1657
https://doi.org/10.1103/physrevb.7.1657
Autor:
Ralph A. Hewes
Publikováno v:
Journal of Luminescence. :778-796
The investigation of the production of visible luminescence from infrared radiation in the systems LnF 3 : Yb 3+ , R.E. 3+ , where Ln is La, Y, Gd, or Lu, and R.E. is Er, Ho or Tm, revealed that the excitation process involves absorption by Yb 3+ ion
Externí odkaz:
https://explore.openaire.eu/search/publication?articleId=doi_________::4578b07aca6f56e689325c4b3973f081
https://doi.org/10.1016/0022-2313(70)90090-6
https://doi.org/10.1016/0022-2313(70)90090-6
Autor:
Ralph A. Hewes, James F Sarver
Publikováno v:
Physical Review. 182:427-436
Externí odkaz:
https://explore.openaire.eu/search/publication?articleId=doi_________::a39291f803ac461f570f25e8710a900b
https://doi.org/10.1103/physrev.182.427
https://doi.org/10.1103/physrev.182.427
Autor:
Ralph Allan Hewes
Publikováno v:
Journal of Applied Physics. 39:4106-4123
Photoconductivity decay measurements on a wide variety of silicon crystals (boron‐ and phosphorusdoped, Czochralski and float‐zone grown, 20≤ρ≤200 Ω·cm) irradiated with 60Co gamma rays indicate that a separate system of levels controls the
Externí odkaz:
https://explore.openaire.eu/search/publication?articleId=doi_________::25b11d3c262ca443aad35f2b66b8c360
https://doi.org/10.1063/1.1656933
https://doi.org/10.1063/1.1656933
Publikováno v:
Acoustical Imaging ISBN: 9781461280842
Since the introduction of the mechanically scanned acoustic microscope by Lemons and Quate,1 a world-wide effort has taken place to make this device2 one of the most widely used tools for materials characterization and development. With the exception
Externí odkaz:
https://explore.openaire.eu/search/publication?articleId=doi_________::d266bf828f528ea6394b05234d087b6c
https://doi.org/10.1007/978-1-4613-0791-4_10
https://doi.org/10.1007/978-1-4613-0791-4_10