Correction [to “‘Experiments with maximum entropy power spectra of sinusoids’ by W. Y. Chen and G. R. Stegen”]

Chen, W. Y; Stegen, G. R.

doi:10.1029/jb079i035p05539

Cited by 19 publications

(29 citation statements)

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“…Our behavioral result departs from the classical finding that schizophrenia is associated with a greater number of errors in Stroop interference trials (31), although not always with a larger interference effect in response times (45,46). One possibility is that the patients were globally slower, thus allowing for a spontaneous dissipation of the prime-induced motor interference effects and its replacement by target-induced activation.…”

Section: Discussioncontrasting

confidence: 57%

Conscious and subliminal conflicts in normal subjects and patients with schizophrenia: The role of the anterior cingulate

Dehaene

Artiges

Naccache

et al. 2003

Proc. Natl. Acad. Sci. U.S.A.

201

145

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The human anterior cingulate cortex (ACC), which is active during conflict-monitoring tasks, is thought to participate with prefrontal cortices in a distributed network for conscious self-regulation. This hypothesis predicts that conflict-related ACC activation should occur only when the conflicting stimuli are consciously perceived. To dissociate conflict from consciousness, we measured the behavioral and brain imaging correlates of a motor conflict induced by task-irrelevant subliminal or conscious primes. The same task was studied in normal subjects and in patients with schizophrenia in whom the ACC and prefrontal cortex are thought to be dysfunctional. Conscious, but not subliminal, conflict affected anterior cingulate activity in normal subjects. Furthermore, patients with schizophrenia, who exhibited a hypoactivation of the ACC and other frontal, temporal, hippocampal, and striatal sites, showed impaired conscious priming but normal subliminal priming. Those findings suggest that subliminal conflicts are resolved without ACC contribution and that the ACC participates in a distributed conscious control network that is altered in schizophrenia.neuroimaging ͉ priming ͉ consciousness ͉ psychiatry

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Section: Discussioncontrasting

confidence: 57%

Conscious and subliminal conflicts in normal subjects and patients with schizophrenia: The role of the anterior cingulate

Dehaene

Artiges

Naccache

et al. 2003

Proc. Natl. Acad. Sci. U.S.A.

201

145

View full text Add to dashboard Cite

show abstract

“…But we have to compromise. Indeed, the frequency structure of the sunspot numbers is likely to be composed of a cluster of lines in the vicinity of the 11-yr period (Currie, 1973;Cole, 1973;Cohen and Lintz, 1974). The periodogram could be replaced by the autocovariance spectrum (Blackman and Tukey, 1959), thus increasing the stability of the spectral estimate at the expense of worse frequency identification.…”

Section: Numerical Technique For the Detection Of Hidden Periodicitiesmentioning

confidence: 99%

“…It is also possible to fit an autoregressive model of given order to the observed residuals (Ulrych and Clayton, 1976), but the resulting maximum entropy spectrum could hardly be trusted since bias in amplitude estimation has proven to be the weakest link in applying the maximum entropy method. In addition, it should be remembered that Chen and Stegen (1974) observed frequency shifts in the maximum entropy spectra of short sinusoids, which depend on the initial phases of the signals.. In this way, frequency determination would become highly questionable.…”

Section: Numerical Technique For the Detection Of Hidden Periodicitiesmentioning

confidence: 99%

“…Cole (1973) used the power spectrum approach of Blackman and Tukey (1959) and concluded that the most basic periods are 10.45 yr and 11.8 yr; other periods are explained in terms of an amplitude or phase modulation of the solar cycle. Currie (1973) as well as Cohen and Lintz (1974) used the maximum entropy method to estimate the power spectrum; this numerical technique may yield some spurious peaks in the maximum entropy spectrum as a result of an inadequate choice of the order of the autoregressive model fitted to the observations and some of the lines detected by Currie are therefore questionable. In this context it is important to remark that the use of any mathematical algorithm to derive hidden periodicities from the data always entails the question as to whether the resulting cycles are not introduced either by the particular numerical method used or by the time interval analyzed.…”

Section: Introductionmentioning

confidence: 99%

“…However, Wolff (1976) anticipates long term persistence of a discrete line spectrum in the solar activity and proposes a regular system of beats between rigidly rotating, inertially oscillating modes in the Sun, permitting the solar mass to vibrate in a large spectrum of mathematically interrelated free modes. Using only two adjustable frequencies in his model, Wolff explains 20 of the 25 periodicities reported by Currie (1973) andCole (1973). On the other hand, M6rth and Schlamminger (1979) investigate planetary influences on variations in sunspot numbers; the physical link between planetary motion and sunspots is sought in the outward transfer of angular momentum from the Sun to the fringe of the solar system.…”

Section: Introductionmentioning

confidence: 99%

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Mathematical modelling of the sunspot cycle

Meyer

1981

Sol Phys

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The sunspot record for the time interval 1749-1977 can be represented conveniently by an harmonic model comprising a relatively large number of lines. Solar activity can otherwise be considered as a sequence of partly overlapping events, triggered periodically at intervals of the order of 11 years. Each individual cycle is approximated by a function of the Maxwell distribution type; the resulting impulse model consists of the superposition of the independent pulses. Application of these two models for the prediction of annual values of the Wolf sunspot numbers leads to controversial results. Mathematical modelling of the sunspot time series does not give an unambiguous result.

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Metal–Organic Framework Based Catalysts for Hydrogen Evolution

Zhu

Zou

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society is still heavily relying on chemical fuels. Therefore, the essential and realistic approaches to environmental and energy issues remain to be the exploration of clean and sustainable energy sources, in order to meet the ever-increasing energy demand. Thanks to its high energy density and environmental friendliness, hydrogen fuel comes into play as a muchanticipated new energy carrier, which is under intensive studies in the academic field. [4] Furthermore, we are already in the new era witnessing the transformation of hydrogen-powered technologies from science fictions to realities. UK is already in the process of replacing their traditional diesel-powered double decker buses with the hydrogen-powered version, which aims to phase out the former by 2018. [5] China announced its world's first hydrogen-powered tram, which was put into business service in the latter half of 2017. [6] Mercedes-Benz had even started its development of personal hydrogen-powered car, and Toyota had commercialized its hydrogen fuel-cell car branded "Mirai." [7,8] However, one critical issue remains to be the conflict between the hydrogen production efficiency and the demand for the mass distribution of hydrogen-powered technologies.Current industrial hydrogen production methods include coal gasification (followed by water-gas shift reaction), steam reforming, cryogenic distillation, and water splitting. [9] Coal gasification and steam reforming utilize the reaction between conventional fossil fuels and water to produce syngas (primarily CO and H 2 ) or CO 2 and H 2 mixture. However, both reactions require high temperatures (can be over 1000 °C) and pressures, which is an energy intensive process and has strict requirements on infrastructures. [10] The reaction products also need to be further separated to obtain relatively high-concentration of hydrogen. Cryogenic distillation takes the advantage of difference in gas boiling points, which can be applied to separate hydrogen from other gas components in the former two hydrogen production methods. However, cryogenic distillation is also an energy intensive process for low-temperature gas liquification. In comparison, hydrogen evolution reaction (HER) through water splitting is much-favored because of the following three prominent advantages: 1) Water splitting can be carried out at room temperature and ambient pressure, which is less restricted by infrastructure requirements. 2) Oxygen and hydrogen can be produced separately or selectively, which eliminate the need for gas separation. 3) Both the hydrogen source Highly efficient hydrogen evolution reactions (HERs) will determine the mass distributions of hydrogen-powered clean technologies in the future. Metal-organic frameworks (MOFs) are emerging as a class of crystalline porous materials. Along with their derivatives, MOFs have recently been under intense study for their applications in various hydrogen production techniques. MOF-based materials possess unique advantages, such as high specific surface area, crystalline porous str...

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Correction [to “‘Experiments with maximum entropy power spectra of sinusoids’ by W. Y. Chen and G. R. Stegen”]

Cited by 19 publications

References 0 publications

Conscious and subliminal conflicts in normal subjects and patients with schizophrenia: The role of the anterior cingulate

Conscious and subliminal conflicts in normal subjects and patients with schizophrenia: The role of the anterior cingulate

Mathematical modelling of the sunspot cycle

Metal–Organic Framework Based Catalysts for Hydrogen Evolution

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