Measurement of intrinsic signal to noise ratios for high performance rigid recording media (abstract)

1985 ◽  
Vol 57 (8) ◽  
pp. 3946-3946
Author(s):  
N. R. Belk ◽  
P. K. George ◽  
G. S. Mowry
Keyword(s):  
High Performance ◽  
Recording Media ◽  
Signal To Noise ◽  
Intrinsic Signal

Grain separation enhanced magnetic coercivity in Pt/Co multilayers.

1993 ◽  
Vol 51 ◽  
pp. 1038-1039 ◽  
Author(s):  
G.A. Bertero ◽  
R. Sinclair
Keyword(s):  
Remanent Magnetization ◽  
Strong Influence ◽  
Uniaxial Anisotropy ◽  
Magnetic Coupling ◽  
Recording Media ◽  
Magnetic Media ◽  
Signal To Noise ◽  
Out Of Plane ◽  
Longitudinal Recording ◽  
The Relationship

Pt/Co multilayers displaying perpendicular (out-of-plane) magnetic anisotropy and 100% perpendicular remanent magnetization are strong candidates as magnetic media for the next generation of magneto-optic recording devices. The magnetic coercivity, Hc, and uniaxial anisotropy energy, Ku, are two important materials parameters, among others, in the quest to achieving higher recording densities with acceptable signal to noise ratios (SNR). The relationship between Ku and Hc in these films is not a simple one since features such as grain boundaries, for example, can have a strong influence on Hc but affect Ku only in a secondary manner. In this regard grain boundary separation provides a way to minimize the grain-to-grain magnetic coupling which is known to result in larger coercivities and improved SNR as has been discussed extensively in the literature for conventional longitudinal recording media.We present here results from the deposition of two Pt/Co/Tb multilayers (A and B) which show significant differences in their coercive fields.

scholarly journals The Intrinsic Signal-to-Noise Ratio in Human Cardiac Imaging at 1.5, 3, and 4 T

1997 ◽  
Vol 125 (1) ◽  
pp. 65-71 ◽  
Author(s):  
H. Wen ◽  
T.J. Denison ◽  
R.W. Singerman ◽  
R.S. Balaban
Keyword(s):  
Cardiac Imaging ◽  
Signal To Noise Ratio ◽  
Signal To Noise ◽  
Intrinsic Signal ◽  
Noise Ratio

Ultimate intrinsic signal-to-noise ratio in MRI

1998 ◽  
Vol 39 (3) ◽  
pp. 462-473 ◽  
Author(s):  
Ogan Ocali ◽  
Ergin Atalar
Keyword(s):  
Signal To Noise Ratio ◽  
Signal To Noise ◽  
Intrinsic Signal ◽  
Noise Ratio

The intrinsic signal-to-noise ratio in NMR imaging

1986 ◽  
Vol 3 (4) ◽  
pp. 604-618 ◽  
Author(s):  
W. A. Edelstein ◽  
G. H. Glover ◽  
C. J. Hardy ◽  
R. W. Redington
Keyword(s):  
Signal To Noise Ratio ◽  
Nmr Imaging ◽  
Signal To Noise ◽  
Intrinsic Signal ◽  
Noise Ratio

Influence of exchange on signal-to-noise ratio in longitudinal recording media

2002 ◽  
Vol 91 (5) ◽  
pp. 3129-3138 ◽  
Author(s):  
O. Chubykalo ◽  
B. Lengsfield ◽  
J. Kaufman ◽  
B. Jones
Keyword(s):  
Signal To Noise Ratio ◽  
Recording Media ◽  
Signal To Noise ◽  
Longitudinal Recording ◽  
Noise Ratio

Catecholamine sulfates as internal standards in HPLC determinations of sulfoconjugated catecholamines in plasma and urine

1991 ◽  
Vol 37 (2) ◽  
pp. 196-199 ◽  
Author(s):  
Gɒnther Strobel ◽  
HelmuT Weicker
Keyword(s):  
High Performance Liquid Chromatography ◽  
Human Plasma ◽  
High Performance ◽  
Signal To Noise Ratio ◽  
Reversed Phase ◽  
Signal To Noise ◽  
Internal Standards ◽  
Human Plasma And Urine ◽  
Plasma And Urine Samples ◽  
Respective Concentration

Abstract A method is described to measure catecholamine sulfates from human plasma and urine by isocratic reversed-phase high-performance liquid chromatography with electrochemical detection. For this measurement we use catecholamine 3-sulfate isomers as internal standards and determine the sulfoconjugates only after eliminating the catecholamines. Catecholamines that have previously been used as internal standards are shown to cause a significant overestimation (P less than 0.05) of the catecholamine sulfates--by 10% to 25% and 20% to 42% in human plasma and urine, respectively. The detection limits (signal-to-noise ratio greater than 3) in plasma and urine samples were about 80 pmol/L for each analyte. The intra-assay and interassay CVs were less than 4.0% and 10.6% in human plasma and less than 6.6% and 12.8% in human urine, respectively. The calibration curves for all catecholamine sulfates in human plasma and urine were linear (r greater than 0.96; P less than 0.001) over the respective concentration ranges of 0.1-100 nmol/L and 5-1000 nmol/L.

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