Search Results - "Ivanov, C P"

PhysioBank, PhysioToolkit, and PhysioNet: components of a new research resource for complex physiologic signals by Goldberger, A L, Amaral, L A, Glass, L, Hausdorff, J M, Ivanov, P C, Mark, R G, Mietus, J E, Moody, G B, Peng, C K, Stanley, H E

“…The newly inaugurated Research Resource for Complex Physiologic Signals, which was created under the auspices of the National Center for Research Resources of…”
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Multifractality in human heartbeat dynamics by Ivanov, P. C., Amaral, L. A., Goldberger, A. L., Havlin, S., Rosenblum, M. G., Struzik, Z. R., Stanley, H. E.

“…There is evidence that physiological signals under healthy conditions may have a fractal temporal structure. Here we investigate the possibility that time…”
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Scale invariance in the nonstationarity of human heart rate by Bernaola-Galván, P, Ivanov, P C, Nunes Amaral, L A, Stanley, H E

“…We introduce a segmentation algorithm to probe the temporal organization of heterogeneities in human heartbeat interval time series. We find that the lengths…”
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Scaling behaviour of heartbeat intervals obtained by wavelet-based time-series analysis by Ivanov, Plamen Ch, Rosenblum, Michael G, Peng, C.-K, Mietus, Joseph, Havlin, Shlomo, Stanley, H. Eugene, Goldberger, Ary L

“…Biological time-series analysis is used to identify hidden dynamical patterns which could yield important insights into underlying physiological mechanisms…”
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Magnitude and sign correlations in heartbeat fluctuations by Ashkenazy, Y., Ivanov, P. C., Havlin, S., Peng, C. K., Goldberger, A. L., Stanley, H. E.

“…We propose an approach for analyzing signals with long-range correlations by decomposing the signal increment series into magnitude and sign series and…”
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Effect of trends on detrended fluctuation analysis by Hu, K, Ivanov, P C, Chen, Z, Carpena, P, Stanley, H E

“…Detrended fluctuation analysis (DFA) is a scaling analysis method used to estimate long-range power-law correlation exponents in noisy signals. Many noisy…”
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Noise effects on the complex patterns of abnormal heartbeats by Schulte-Frohlinde, V., Ashkenazy, Y., Ivanov, P. C., Glass, L., Goldberger, A. L., Stanley, H. E.

“…Patients at high risk for sudden death often exhibit complex heart rhythms in which abnormal heartbeats are interspersed with normal heartbeats. We analyze…”
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Time correlations and 1/f behavior in backscattering radar reflectivity measurements from cirrus cloud ice fluctuations by Ivanova, K., Ackerman, T. P., Clothiaux, E. E., Ivanov, P. Ch, Stanley, H. E., Ausloos, M.

“…The state of the atmosphere is governed by the classical laws of fluid motion and exhibits correlations in various spatial and temporal scales. These…”
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When human walking becomes random walking: fractal analysis and modeling of gait rhythm fluctuations by Hausdorff, Jeffrey M., Ashkenazy, Yosef, Peng, Chang-K., Ivanov, Plamen Ch, Stanley, H.Eugene, Goldberger, Ary L.

“…We present a random walk, fractal analysis of the stride-to-stride fluctuations in the human gait rhythm. The gait of healthy young adults is scale-free with…”
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effect of wheat seed presowing treatment with salicylic acid on its endogenous content, activities of respiratory pathways, and plant antioxidant status by Rakhmankulova, Z. F, Fedyaev, V. V, Rakhmatulina, S. R, Ivanov, C. P, Gilvanova, I. R, Usmanov, I. Yu

“…We studied the effects of wheat (Triticum aestivum L.) seed presowing treatment with 0.05 mM salicylic acid (SA) on its endogenous content and the ratio of…”
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Behavioral-independent features of complex heartbeat dynamics by Nunes Amaral, L A, Ivanov, P C, Aoyagi, N, Hidaka, I, Tomono, S, Goldberger, A L, Stanley, H E, Yamamoto, Y

“…We test whether the complexity of the cardiac interbeat interval time series is simply a consequence of the wide range of scales characterizing human behavior,…”
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Fractal dynamics in physiology: Alterations with disease and aging by Goldberger, Ary L, Amaral, Luis A N, Hausdorff, Jeffrey M, Ivanov, Plamen Ch, Peng, C-K, Stanley, H Eugene

“…According to classical concepts of physiologic control, healthy systems are self-regulated to reduce variability and maintain physiologic constancy. Contrary…”
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Formation of amino acids on heating glycine with alumina by Ivanov, C P, Slavcheva, N N

“…The conversion of glycine into amino acids on heating at 240 degrees C with basic manganous carbonate and alumina is investigated. Alanine, alpha-aminobutyric…”
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Spiral wave annihilation by low-frequency planar fronts in a model of excitable media by de la Casa, Miguel A, de la Rubia, F. Javier, Ivanov, Plamen Ch

“…We perform numerical lattice simulations of an excitable medium. We show that the interaction of a spiral wave with a periodic train of planar fronts leads to…”
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A study of the interaction of glycine and its oligohomopeptides with formaldehyde and acetaldehyde under possible primitive earth conditions by Ivanov, C P, Ivanov, O C

“…It is established that glycine and glycine oligohomopeptides interact with formaldehyde and acetaldehyde in a homogeneous weak acid medium (pH 3.3-3.7) at mild…”
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Network Physiology in Aging and Frailty: The Grand Challenge of Physiological Reserve in Older Adults by Romero-Ortuño, Román, Martínez-Velilla, Nicolás, Sutton, Richard, Ungar, Andrea, Fedorowski, Artur, Galvin, Rose, Theou, Olga, Davies, Andrew, Reilly, Richard B, Claassen, Jurgen, Kelly, Áine M, Ivanov, Plamen Ch

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Some analogies between prebiotic thermal conversions of glycine and metabolic pathways by Ivanov, C P, Slavcheva, N N

“…The reaction schemes suggested earlier for thermal transformation of glycine into amino acids and carboxylic acids are considered in detail. Close analogy with…”
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Common Scale-Invariant Patterns of Sleep-Wake Transitions across Mammalian Species by Lo, Chung-Chuan, Chou, Thomas, Penzel, Thomas, Scammell, Thomas E., Strecker, Robert E., Stanley, H. Eugene, Plamen Ch. Ivanov

“…Although mammals of different species have different sleep patterns, brief sleep-wake transitions commonly are observed across species and appear to occur…”
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Metal-insulator transition in chains with correlated disorder by Carpena, Pedro, Bernaola-Galván, Pedro, Ivanov, Plamen Ch, Stanley, H. Eugene

“…According to Bloch's theorem, electronic wavefunctions in perfectly ordered crystals are extended, which implies that the probability of finding an electron is…”
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Magnitude and sign scaling in power-law correlated time series by Ashkenazy, Yosef, Havlin, Shlomo, Ivanov, Plamen Ch, Peng, Chung-K., Schulte-Frohlinde, Verena, Stanley, H.Eugene

“…A time series can be decomposed into two sub-series: a magnitude series and a sign series. Here we analyze separately the scaling properties of the magnitude…”
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