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Case depth in SAE 1020 steel using barkhausen noise

Alessandra Drehmer, Gunther J. L. Gerhardt, Frank P. Missell
2013 Materials Research  
The following Table 1 shows values of l 1 , l 2 , c 1 , and c 2 for the samples studied here.  ...  The transition midpoint is given by l 1 , while the transition width is l 2 . erfc(z) is the complementary error function.  ... 
doi:10.1590/s1516-14392013005000095 fatcat:g4arx22aifaoxbv3xhvgxbfhti

Topography-specific spindle frequency changes in Obstructive Sleep Apnea

Suzana V Schönwald, Diego Z Carvalho, Emerson L de Santa-Helena, Ney Lemke, Günther J L Gerhardt
2012 BMC Neuroscience  
Sleep spindles, as detected on scalp electroencephalography (EEG), are considered to be markers of thalamo-cortical network integrity. Since obstructive sleep apnea (OSA) is a known cause of brain dysfunction, the aim of this study was to investigate sleep spindle frequency distribution in OSA. Seven non-OSA subjects and 21 patients with OSA (11 mild and 10 moderate) were studied. A matching pursuit procedure was used for automatic detection of fast (≥ 13Hz) and slow (< 13Hz) spindles obtained
more » ... rom 30min samples of NREM sleep stage 2 taken from initial, middle and final night thirds (sections I, II and III) of frontal, central and parietal scalp regions. Results: Compared to non-OSA subjects, Moderate OSA patients had higher central and parietal slow spindle percentage (SSP) in all night sections studied, and higher frontal SSP in sections II and III. As the night progressed, there was a reduction in central and parietal SSP, while frontal SSP remained high. Frontal slow spindle percentage in night section III predicted OSA with good accuracy, with OSA likelihood increased by 12.1% for every SSP unit increase (OR 1.121, 95% CI 1.013 -1.239, p=0.027). Conclusions: These results are consistent with diffuse, predominantly frontal thalamo-cortical dysfunction during sleep in OSA, as more posterior brain regions appear to maintain some physiological spindle frequency modulation across the night. Displaying changes in an opposite direction to what is expected from the aging process itself, spindle frequency appears to be informative in OSA even with small sample sizes, and to represent a sensitive electrophysiological marker of brain dysfunction in OSA.
doi:10.1186/1471-2202-13-89 pmid:22985414 pmcid:PMC3496607 fatcat:3mmtrqngrzbyjn7viddp2l7c4u

Analysis of EEG Sleep Spindle Parameters from Apnea Patients Using Massive Computing and Decision Tree
English

Gunther J. L. Gerhardt, Ney Lemke, Diego Z. Carvalho, Emerson L. de Santa-Helena, Suzana V. Schonwald, Guilherme Dellagustin, Jose L. Rybarczyk Filho
2014 Scientia cum Industria  
Laboratory, Neurology Medicine Division, Hospital de Clínicas de Porto Alegre, Universidade Federal do Rio Grande do Sul, Brazil; † † † Department of Physics, Universidade Federal de Sergipe, Brazil gunther  ... 
doi:10.18226/23185279.v2iss1p15 fatcat:h5q2zb5bebdona7eijdp76xpxu

Poster: Quantification of correlations between sleep spindles in EEG for patients with sleep apnea

Rafael Toledo F. de Souza, Jose Luiz Rybarczyk Filho, Ney Lemke, Suzana V. Schonwald, Emerson L. de Santa-Helena, Gunther J. L. Gerhardt
2013 2013 IEEE 3rd International Conference on Computational Advances in Bio and medical Sciences (ICCABS)  
doi:10.1109/iccabs.2013.6629210 dblp:conf/iccabs/SouzaFLSSG13 fatcat:4grcsbam6bfv3nwywbcqdpufvm

Page 66 of Isis Vol. 29, Issue 1 [page]

1938 Isis  
GERHARDT, O., 23.7. GInzEL, F. K., 08.2, 11.1, 27.3. gravitation, 21.5. Great Britain, 25.1. Greek, astronomy, 28.1, 28.2; science, 36.4. Greenwich, 33.2. GuNDEL, W., 27.5. GuNTHER, R. T., 33.6.  ...  L LANGDON, 5., 28.3. length of the day, 27.4, 36.5.  ... 

Page 64 of Art Institute of Chicago. Bulletin of the Art Institute of Chicago Vol. 61, Issue SUPPLEMENT [page]

1966 Art Institute of Chicago. Bulletin of the Art Institute of Chicago  
Flory Lee Furth Paul Gerhardt Sarah Franklin Graves Elinore Jaicks Greenleaf Clarissa Donnelley Haffner Benjamin J. Hannewyk Carter H. Harrison Mrs. Clara C. Headland Grace Phinisey Hill Mrs.  ...  Rose Adelman Robert Allerton J. Arthur Barzquist Edward L. Barsumian Frederic Clay Bartlett Alice Kimpton Berg Mrs. Herbert Byfield Edward B. Blair Harry H. Blum Emily Crane Chadbourne William M.  ... 

Framework and Tools for the Simulation and Analysis of the Radio Emission from Air Showers at IceCube [article]

R. Abbasi, M. Ackermann, J. Adams, J. A. Aguilar, M. Ahlers, M. Ahrens, J.M. Alameddine, A. A. Alves Jr., N. M. Amin, K. Andeen, T. Anderson, G. Anton (+374 others)
2022 arXiv   pre-print
in spherical coordinates, ì L ( 𝑓 , 𝜃, 𝜙).  ...  of A 𝑗 𝑘 , P 𝑗 𝑘 = exp 𝑖 𝜙 𝑗 𝑘 = A 𝑗 𝑘 /|A 𝑗 𝑘 |. (3.3) The use of the unit vector in the complex plane, rather than directly calculating the phase angle, 𝜙 𝑗 𝑘 , was done to more naturally  ... 
arXiv:2205.02258v1 fatcat:qhyfrzlcevhurdn2me63rn5mka

Low Energy Event Reconstruction in IceCube DeepCore [article]

R. Abbasi, M. Ackermann, J. Adams, J. A. Aguilar, M. Ahlers, M. Ahrens, J.M. Alameddine, A. A. Alves Jr., N. M. Amin, K. Andeen, T. Anderson, G. Anton (+373 others)
2022 arXiv   pre-print
As a starting point for the hit selection, we choose the hit with the highest charge on each string, i = 0, and first remove any earlier hit, j, where −∆t 0j > τ 0j .  ...  The variables used as input features are the following reconstructed quantities determined by retro: -L( Êtrck )/L(E trck = 0): Likelihood ratio between the full reconstruction and a cascade-only hypothesis  ... 
arXiv:2203.02303v1 fatcat:bxnlz325ijauzjbtd5n2pdxsdy

First Search for Unstable Sterile Neutrinos with the IceCube Neutrino Observatory [article]

R. Abbasi, M. Ackermann, J. Adams, J. A. Aguilar, M. Ahlers, M. Ahrens, J.M. Alameddine, A. A. Alves Jr., N. M. Amin, K. Andeen, T. Anderson, G. Anton (+372 others)
2022 arXiv   pre-print
We present a search for an unstable sterile neutrino by looking for a matter-induced signal in eight years of atmospheric ν_μ data collected from 2011 to 2019 at the IceCube Neutrino Observatory. Both the (stable) three-neutrino and the 3+1 sterile neutrino models are disfavored relative to the unstable sterile neutrino model, though with p-values of 2.5% and 0.81%, respectively, we do not observe evidence for 3+1 neutrinos with neutrino decay. The best-fit parameters for the sterile neutrino
more » ... th decay model from this study are Δ m_41^2=6.7^+3.9_-2.5 eV^2, sin^2 2θ_24=0.33^+0.20_-0.17, and g^2=2.5π±1.5π, where g is the decay-mediating coupling. The preferred regions from short-baseline oscillation searches are excluded at 90% C.L.
arXiv:2204.00612v1 fatcat:ezr6e4vzhvbvrce7w2vycsjbom

Strong constraints on neutrino nonstandard interactions from TeV-scale ν_μ disappearance at IceCube [article]

IceCube Collaboration: R. Abbasi, M. Ackermann, J. Adams, J. A. Aguilar, M. Ahlers, M. Ahrens, J.M. Alameddine, A. A. Alves Jr., N. M. Amin, K. Andeen, T. Anderson, G. Anton (+371 others)
2022 arXiv   pre-print
mixing parameters [38, 39] , E ν is the neutrino energy, L is the matter baseline, and V d is the constant potential induced by down quarks (fermion contributions to µτ are normalized to the down quark  ...  [24] , the atmospheric neutrino oscillation probability may be approximated for E ν > 100 GeV as P (ν µ → ν τ ) = sin(2θ 23 ) ∆m 2 31 2E ν + 2V d µτ 2 L 2 (3) where θ 23 and ∆m 2 31 are standard neutrino  ... 
arXiv:2201.03566v1 fatcat:os2iwnfgcrcqdcaugfsxx4q5qy

Density of GeV muons in air showers measured with IceTop [article]

R. Abbasi, M. Ackermann, J. Adams, J. A. Aguilar, M. Ahlers, M. Ahrens, J.M. Alameddine, A. A. Alves Jr., N. M. Amin, K. Andeen, T. Anderson, G. Anton (+368 others)
2022 arXiv   pre-print
For a uniform beam of muons entering a tank, the statistical distribution, g(l), of track lengths, l, can be calculated analytically [52] .  ...  e − Nµ tank p (S | N µ = n) , (6) where g(l | θ) and K(S | l, µ, σ, λ) are the track-length and tank-response functions shown in Figs. 4a and 4b , respectively.  ... 
arXiv:2201.12635v2 fatcat:x3wwsyv5gvbhrhagsto5aomlq4

Searches for Connections between Dark Matter and High-Energy Neutrinos with IceCube [article]

R. Abbasi, M. Ackermann, J. Adams, J. A. Aguilar, M. Ahlers, M. Ahrens, J.M. Alameddine, A. A. Alves Jr., N. M. Amin, K. Andeen, T. Anderson, G. Anton (+368 others)
2022 arXiv   pre-print
In symbols, the likelihood in the frequentist framework, or the unnormalized posterior density in the Bayesian framework, is given by L(Θ, η) = m nm i L Eff (µ t i (Θ, η), σ t i (Θ, η); d t i ) s Π s (  ...  the likelihood of the i-th bin when observing x i events with an expectation µ i ( Θ, η) and associated MC sample size uncertainty σ i ( Θ, η), both derived from simulation, is given by the function L  ... 
arXiv:2205.12950v1 fatcat:b53fhddkw5e6bk6izs42jrpp6m

Search for High-Energy Neutrinos from Ultra-Luminous Infrared Galaxies with IceCube [article]

IceCube Collaboration: R. Abbasi, M. Ackermann, J. Adams, J. A. Aguilar, M. Ahlers, M. Ahrens, C. Alispach, A. A. Alves Jr., N. M. Amin, R. An, K. Andeen, T. Anderson (+369 others)
2021 arXiv   pre-print
The stacking weight of source k ∈ {1, 2, ..., M } is constructed as w k = r k t k / M j=1 r j t j .  ...  The above results do not constrain the possible contribution of LIRGs (10 11 LL IR < 10 12 L ) to the diffuse neutrino flux.  ... 
arXiv:2107.03149v2 fatcat:2bd6e5z2lbfq7kzyl5ki6ykswi

Search for Relativistic Magnetic Monopoles with Eight Years of IceCube Data [article]

IceCube Collaboration: R. Abbasi, M. Ackermann, J. Adams, J. A. Aguilar, M. Ahlers, M. Ahrens, C. Alispach, A. A. Alves Jr., N. M. Amin, R. An, K. Andeen, T. Anderson (+371 others)
2021 arXiv   pre-print
of the magnetic field and L represents the size of the domain where the magnetic field direction remains constant.  ...  Remaining magnetic monopoles will be accelerated along the magnetic field lines of galactic and extragalactic magnetic fields, gaining a kinetic energy given by E k = g D | B|L , where | B| is the strength  ... 
arXiv:2109.13719v1 fatcat:3iwcfswr6vhl7g4sqknbfhtkqe

Search for multi-flare neutrino emissions in 10 years of IceCube data from a catalog of sources [article]

IceCube collaboration: R. Abbasi, M. Ackermann, J. Adams, J. A. Aguilar, M. Ahlers, M. Ahrens, C. Alispach, A. A. Alves Jr., N. M. Amin, R. An, K. Andeen, T. Anderson (+366 others)
2021 arXiv   pre-print
Since each IceCube sample is independent, the total 10-year likelihood L is defined as the product of the likelihoods of each single IceCube sample L j : L( n s , γ, t 0 , σ T ) = j=sample L j ( n s,j  ...  , γ, t 0 , σ T ), (1) where L j is defined as L j ( n s,j , γ, t 0 , σ T ) = Nj i=1 f =flares n f s,j S j (|x s − x i |, σ i , E i , t i ; γ f , t f 0 , σ f T ) N j + 1 − f n f s,j N j B j (sin δ i , E  ... 
arXiv:2109.05818v1 fatcat:bc5lun6orbff3da7o6iox4i52a
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