Zobrazeno 1 - 10
of 76
pro vyhledávání: '"Allen N. Garroway"'
Publikováno v:
Applied Magnetic Resonance. 25:485-500
The fictitious spin-1/2 operators are well known to describe the evolution of a pure nuclear quadrupole resonance (NQR) system; particularly, the application of a radio-frequency pulse at one of the NQR transition frequencies is equivalent to a three
Externí odkaz:
https://explore.openaire.eu/search/publication?articleId=doi_________::138ff1813c4305d01ead379142d893b8
https://doi.org/10.1007/bf03166543
https://doi.org/10.1007/bf03166543
Autor:
Joel B. Miller, Allen N. Garroway
Publikováno v:
Applied Magnetic Resonance. 25:475-483
The application of nuclear quadrupole resonance (NQR) to the detection of materials can be hampered by the low sensitivity of the technique. The use of surface coils for remote detection only exacerbates this problem. In this paper we demonstrate the
Externí odkaz:
https://explore.openaire.eu/search/publication?articleId=doi_________::e8276d59c491bc2e31c6def375ed08f9
https://doi.org/10.1007/bf03166542
https://doi.org/10.1007/bf03166542
Autor:
Allen N. Garroway, Bryan H. Suits
Publikováno v:
Journal of Applied Physics. 94:4170-4178
A computational method for optimizing both single- and two-layer surface coils is presented that is relatively easy to implement in practice using either a variational approach or through standard numerical matrix diagonalization techniques. The tech
Externí odkaz:
https://explore.openaire.eu/search/publication?articleId=doi_________::b614f0ae834a9f268a33148dafaa072b
https://doi.org/10.1063/1.1601296
https://doi.org/10.1063/1.1601296
Publikováno v:
Solid State Nuclear Magnetic Resonance. 24:123-136
Nitrogen is prevalent in many materials, both naturally occurring and man-made. In particular, it is found in many explosives and other contraband materials. One technique for the detection of such materials in the field is the use of the magnetic re
Externí odkaz:
https://explore.openaire.eu/search/publication?articleId=doi_dedup___::117a2524c2eb5650cb6fd52a371c9bf4
https://doi.org/10.1016/s0926-2040(03)00045-6
https://doi.org/10.1016/s0926-2040(03)00045-6
Publikováno v:
The Journal of Chemical Physics. 118:5071-5081
We demonstrate, theoretically and experimentally, that the irradiation of a powder sample containing spin-1 nuclei by two of the three characteristic nuclear quadrupole resonance (NQR) frequencies can result in several echo signals at the third NQR f
Externí odkaz:
https://explore.openaire.eu/search/publication?articleId=doi_________::d37667db5f9eb228f92e2dbecbf6786c
https://doi.org/10.1063/1.1545442
https://doi.org/10.1063/1.1545442
Publikováno v:
Journal of Magnetic Resonance. 151:228-234
The low sensitivity of nuclear quadrupole resonance (NQR) of powders is due, in part, to the inability to efficiently excite and detect nuclei at all crystal orientations. Here we describe the use of circularly polarized RF magnetic fields for excita
Externí odkaz:
https://explore.openaire.eu/search/publication?articleId=doi_________::b1d800ccdc05f6555f759b6eb36f2ea6
https://doi.org/10.1006/jmre.2001.2366
https://doi.org/10.1006/jmre.2001.2366
Publikováno v:
Chemical Physics Letters. 342:362-368
We introduce a new nuclear quadrupole resonance (NQR) method for the detection of spin-1 nuclei, where the transition excited and directly detected is not irradiated at all. It is demonstrated, theoretically and experimentally, that the irradiation o
Externí odkaz:
https://explore.openaire.eu/search/publication?articleId=doi_________::e412888e157a99243a52f06d1e513adb
https://doi.org/10.1016/s0009-2614(01)00602-9
https://doi.org/10.1016/s0009-2614(01)00602-9
Autor:
Joel B. Miller, R. Matthews, A.D. Hibbs, G.A. Barrall, Allen N. Garroway, Bryan H. Suits, L.J. Burnett, M. L. Buess
Publikováno v:
IEEE Transactions on Geoscience and Remote Sensing. 39:1108-1118
Detection of explosives has the flavor of those mathematical problems that are not invertible. It is easier to hide explosives than to find them. Many approaches have been proposed and executed for the remote detection of explosives, contraband mater
Externí odkaz:
https://explore.openaire.eu/search/publication?articleId=doi_________::d37c6c388c4f42595affc2bd9654d449
https://doi.org/10.1109/36.927420
https://doi.org/10.1109/36.927420
Autor:
Allen N. Garroway
Publikováno v:
Magma: Magnetic Resonance Materials in Physics, Biology, and Medicine. 9:103-108
The contributions of Sir Peter Mansfield to MRI are rooted in solid state NMR. I summarize some of the important contributions of Sir Peter to that field, provide a glimpse of the state of the art in multiple-pulse line-narrowing in the early 1970s,
Externí odkaz:
https://explore.openaire.eu/search/publication?articleId=doi_dedup___::6936d9bd95ee7cf5518d96a2a59d39c2
https://doi.org/10.1007/bf02594604
https://doi.org/10.1007/bf02594604
Publikováno v:
Journal of Magnetic Resonance. 135:373-379
The use of surface coils in magnetic resonance is widespread. Examples include MRI, detection of subsurface aquifers by NMR, and, more recently, landmine detection by nuclear quadrupole resonance. In many of these cases a finite-sized sample to be ex
Externí odkaz:
https://explore.openaire.eu/search/publication?articleId=doi_dedup___::31a5c81a77ade037a3f535069db203cb
https://doi.org/10.1006/jmre.1998.1608
https://doi.org/10.1006/jmre.1998.1608