Relevant bibliographies by topics / Coherence effect / Journal articles
To see the other types of publications on this topic, follow the link: Coherence effect.

Journal articles on the topic 'Coherence effect'

Author: Grafiati
Published: 4 June 2021
Last updated: 1 February 2022

Create a spot-on reference in APA, MLA, Chicago, Harvard, and other styles

Select a source type:

Consult the top 50 journal articles for your research on the topic 'Coherence effect.'

Next to every source in the list of references, there is an 'Add to bibliography' button. Press on it, and we will generate automatically the bibliographic reference to the chosen work in the citation style you need: APA, MLA, Harvard, Chicago, Vancouver, etc.

You can also download the full text of the academic publication as pdf and read online its abstract whenever available in the metadata.

Browse journal articles on a wide variety of disciplines and organise your bibliography correctly.

1

Baker, Stuart N., Elizabeth M. Pinches, and Roger N. Lemon. "Synchronization in Monkey Motor Cortex During a Precision Grip Task. II. Effect of Oscillatory Activity on Corticospinal Output." Journal of Neurophysiology 89, no. 4 (April 1, 2003): 1941–53. http://dx.doi.org/10.1152/jn.00832.2002.

Full text
Abstract:
Recordings from primary motor cortex (M1) during periods of steady contraction show oscillatory activity; these oscillations are coherent with the activity of contralateral muscles. We investigated synchronization of corticospinal output neurons with the oscillations, which could provide the pathway for their transmission to the spinal motoneurons. One hundred seventy-six antidromically identified pyramidal tract neurons (PTNs) were recorded from M1 in three macaque monkeys trained to perform a precision grip task. Local field potentials (LFP) were simultaneously recorded. All analysis was confined to the hold period of the task, where our previous work has shown that there is the strongest oscillatory activity. Coherence was calculated between LFP and PTN discharge. Significant coherence was seen in three bands, with frequencies of 10–14, 17–31, and 34–44 Hz. Coherence values were low, with the majority of PTN–LFP coherences having a peak lower than 0.05. The phase of coherence was approximately −π/2 radians for each band (with LFP polarity defined as negative upward), although there was some dispersion of phase across the population of PTNs. Coherence was also calculated between pairs of PTNs that had been simultaneously recorded. Where there was significant coherence, it was also generally smaller than 0.05. The phase of PTN–PTN coherence clustered around zero radians. A computer model was constructed to assist the interpretation of the experimental results. It simulated an integrate-and-fire neuron responding to synaptic inputs. A fraction of the synaptic inputs was synchronized with a simulated LFP; the remainder were uncorrelated with it. The model showed that coherence between the LFP and the output spike train considerably underestimated the fraction of synchronized inputs. Additionally, for a given fraction of synchronized inputs, coherence was smaller for high- compared with low-frequency bins. Cell discharge rate also influenced the spike–LFP coherence: coherence was higher for simulations in which the cell discharged at a faster rate. Thus although levels of PTN–LFP coherence seen experimentally were low, a considerable proportion of the input to the PTN must be synchronized with the global oscillatory activity recorded by the LFP. The low LFP–PTN coherences do however indicate that cortical oscillations are transmitted with only low fidelity in the discharge of a single PTN. Using further computer simulations, it was demonstrated that a small population of PTNs could encode the cortical oscillatory signal effectively, since the action of averaging across the population improves the signal:noise ratio. The oscillations will therefore be effectively transmitted to spinal motoneurons, and this has important consequences for the possible role of oscillations in motor control of the hand.
APA, Harvard, Vancouver, ISO, and other styles
2

Xi-Hua, Yang, Zhang Jun, Zhang Hui-Fang, and Yan Xiao-Na. "Collision-Induced Coherence Effect on Coherent Population Transfer." Chinese Physics Letters 26, no. 7 (July 2009): 073202. http://dx.doi.org/10.1088/0256-307x/26/7/073202.

Full text
APA, Harvard, Vancouver, ISO, and other styles
3

Wright, Michael J., and Kevin N. Gurney. "Coherence and Motion Transparency in Rigid and Nonrigid Plaids." Perception 26, no. 5 (May 1997): 553–67. http://dx.doi.org/10.1068/p260553.

Full text
Abstract:
Under a wide range of conditions, stimuli composed of two superimposed grating components with unequal rotation velocities (differing in sign and/or magnitude) gave a striking percept of a single, coherent, nonrigidly deforming plaid surface. Conversely, component angular velocities of the same sign and magnitude yielded rigidly rotating plaids. Rigidity and motion coherence were shown to be independent percepts, and coherent plaids were categorised unambiguously as rigid or nonrigid. Coherence and motion transparency were found to depend upon the relative orientation of components, and polar plots showed two lobes of high coherence for narrow intercomponent angles. There was a slight tendency for plaids with unequal component rotations to appear less coherent, but this was nonsignificant, once the effect of intercomponent angle was taken into account. Changes in the relative spatial frequency of components, relative contrast of components, and repeated presentation produced equivalent effects on coherence for rigid and nonrigid types of plaid motion. Manipulation of the terminators in the display by making the aperture diameters for the two component gratings unequal reduced coherence and increased transparency. The effect was the same for rigid and nonrigid plaids. Coherence in rigid and nonrigid plaids thus depends primarily on local processes and there is no strong interaction between rigidity and coherence.
APA, Harvard, Vancouver, ISO, and other styles
4

James, Daniel F. V. "The effect of spatial coherence of sources on synthetic aperture mapping." International Astronomical Union Colloquium 131 (1991): 10–14. http://dx.doi.org/10.1017/s0252921100012999.

Full text
Abstract:
The interferometric mapping of astronomical objects relies on the van-Cittert Zernike theorem, one of the major results of the theory of partially coherent light [see, Bom and Wolf (1980), chapter 10]. This theorem states that the degree of spatial coherence of the field from a distant spatially incoherent source is proportional to the Fourier transform of the intensity distribution across the source. Measurement of the degree of spatial coherence, by, for example, measuring the visibility of interference fringes, allows the object to be mapped by making an inverse Fourier transform. (For a full description of this technique see Thompson, Moran and Swenson, 1986.)In this paper I present a summary of the results an investigation into what happens when the distant source is not spatially coherent (James, 1990). Using a heuristic model of a spherically symmetric partially coherent source, an analytic expression for the error in the measurement of the effective radius, expressed as a function of coherence area, can be obtained.
APA, Harvard, Vancouver, ISO, and other styles
5

Shinohara, Yuya, and Yoshiyuki Amemiya. "Effect of finite spatial coherence length on small-angle scattering." Journal of Applied Crystallography 48, no. 6 (October 13, 2015): 1660–64. http://dx.doi.org/10.1107/s160057671501715x.

Full text
Abstract:
This study shows that forward scattering at the origin of reciprocal space contributes to the scattering intensity profiles of ultra-small-angle scattering. The forward scattering corresponds to a Fourier transform of the X-ray coherent volume on a sample. This contribution is usually ignored in the study of small-angle scattering, while it is fully considered in the fields of X-ray imaging, such as coherent X-ray diffraction imaging and X-ray ptychography. This effect is explicitly illustrated in the context of small-angle scattering, and the effect of a finite spatial coherence length on small-angle scattering is discussed.
APA, Harvard, Vancouver, ISO, and other styles
6

Mancia, Giuseppe, Gianfranco Parati, Paolo Castiglioni, and Marco di Rienzo. "Effect of sinoaortic denervation on frequency-domain estimates of baroreflex sensitivity in conscious cats." American Journal of Physiology-Heart and Circulatory Physiology 276, no. 6 (June 1, 1999): H1987—H1993. http://dx.doi.org/10.1152/ajpheart.1999.276.6.h1987.

Full text
Abstract:
In animals and humans, baroreceptor modulation of the sinus node in daily life can be studied by identification of the number of sequences in which systolic blood pressure (SBP) and pulse interval (PI) linearly decrease or increase for several beats. It is also studied by power spectral analysis of SBP and PI in regions where their powers are coherent, although, in contrast to the sequence method, whether this frequency-domain method specifically reflects the baroreceptor-heart rate reflex has not been adequately tested. We recorded intra-arterial BP for ∼3.5 h in eight conscious cats, first intact and then 7–10 days after sinoaortic denervation (SAD). Sensitivity of baroreceptor-heart rate reflex was assessed in 120-s segments by the square root of the ratio of PI and SBP spectral powers (α) in the regions around 0.1 (MF) and 0.3 (HF) Hz, and coherence between PI and SBP spectral powers in MF and HF regions was computed. SAD increased overall SBP variability and reduced PI variability throughout the frequency range examined. SAD markedly reduced ( P < 0.01) both α-MF (−65.6%) and α-HF (−79.9%) and consistently reduced the number of coherent segments [i.e., where coherence ( K 2) > 0.5] and average coherence values in the MF region. In the HF region, however, SAD did not alter the number of coherent segments, and although average coherence value throughout the HF band was reduced, in restricted portions of the band (different between animals), a high coherence value survived denervation. No significant changes were seen in any measured variables in five sham-operated cats. Thus the frequency-domain method specifically reflects baroreflex modulation of heart rate in the MF region only. In the HF region, in contrast, baroreflex and nonbaroreflex influences on the sinus node both contribute to a variable degree to determination of heart rate responses to BP oscillations. If used to study baroreflex function in daily life, this method should use the coefficient derived from MF data.
APA, Harvard, Vancouver, ISO, and other styles
7

Liu, Jianji, Zhixiang Li, Hongming Fan, and Guoquan Zhang. "Coherent Optical Field Manipulation and Optical Information Processing Based on Electromagnetically-Induced Transparency Effect in Pr3+:Y2SiO5 Crystal." Applied Sciences 8, no. 7 (July 19, 2018): 1179. http://dx.doi.org/10.3390/app8071179.

Full text
Abstract:
We reviewed the recent progress in coherent manipulation on light fields based on the electromagnetically-induced transparency (EIT) effect in Pr3+-doped Y2SiO5 crystal. The results show that, on one hand, the atomic coherence grating, formed when the light pulse is stored in Pr3+:Y2SiO5 crystal under the EIT condition has similar properties to the traditional holographic grating. On the other hand, the atomic coherence grating has its own unique characteristics that are different from those of traditional holographic grating. The EIT-induced nonlinearity and atomic coherence gratings can be used to manipulate the amplitude, the phase and the polarization state of light fields; therefore, they are of important applications for optical signal processing, quantum information processing and imaging processing.
APA, Harvard, Vancouver, ISO, and other styles
8

Walls, D. F., and G. J. Milburn. "Effect of dissipation on quantum coherence." Physical Review A 31, no. 4 (April 1, 1985): 2403–8. http://dx.doi.org/10.1103/physreva.31.2403.

Full text
APA, Harvard, Vancouver, ISO, and other styles
9

Shao, Jiushu, Christine Zerbe, and Peter Hänggi. "Suppression of quantum coherence: Noise effect." Chemical Physics 235, no. 1-3 (September 1998): 81–92. http://dx.doi.org/10.1016/s0301-0104(98)00074-3.

Full text
APA, Harvard, Vancouver, ISO, and other styles
10

Obada, A. S. F., and A. M. Abdel-Hafez. "Effect of atomic coherence on squeezing." Physical Review A 43, no. 9 (May 1, 1991): 5161–64. http://dx.doi.org/10.1103/physreva.43.5161.

Full text
APA, Harvard, Vancouver, ISO, and other styles
11

Azimov, Ya I., Yu L. Dokshitzer, V. A. Khoze, and S. I. Troyan. "The string effect and QCD coherence." Physics Letters B 165, no. 1-3 (December 1985): 147–50. http://dx.doi.org/10.1016/0370-2693(85)90709-9.

Full text
APA, Harvard, Vancouver, ISO, and other styles
12

Barvk, Ivan, and Pavel Heman. "Effect of trapping on transport coherence." Physical Review B 45, no. 6 (February 1, 1992): 2772–78. http://dx.doi.org/10.1103/physrevb.45.2772.

Full text
APA, Harvard, Vancouver, ISO, and other styles
13

Brion, E., G. Harel, N. Kebaili, V. M. Akulin, and I. Dumer. "Coherence protection by the Zeno effect." Europhysics Letters (EPL) 66, no. 2 (April 2004): 157–63. http://dx.doi.org/10.1209/epl/i2003-10206-0.

Full text
APA, Harvard, Vancouver, ISO, and other styles
14

Kekez, Mladen M. "Coherence Effect in the Broadband Source." IEEE Transactions on Plasma Science 42, no. 4 (April 2014): 924–29. http://dx.doi.org/10.1109/tps.2014.2307695.

Full text
APA, Harvard, Vancouver, ISO, and other styles
15

Singer, Andrej, and Ivan A. Vartanyants. "Coherence properties of focused X-ray beams at high-brilliance synchrotron sources." Journal of Synchrotron Radiation 21, no. 1 (November 2, 2013): 5–15. http://dx.doi.org/10.1107/s1600577513023850.

Full text
Abstract:
An analytical approach describing properties of focused partially coherent X-ray beams is presented. The method is based on the results of statistical optics and gives both the beam size and transverse coherence length at any distance behind an optical element. In particular, here Gaussian Schell-model beams and thin optical elements are considered. Limiting cases of incoherent and fully coherent illumination of the focusing element are discussed. The effect of the beam-defining aperture, typically used in combination with focusing elements at synchrotron sources to improve transverse coherence, is also analyzed in detail. As an example, the coherence properties in the focal region of compound refractive lenses at the PETRA III synchrotron source are analyzed.
APA, Harvard, Vancouver, ISO, and other styles
16

LEE, CHIU FAN, NEIL F. JOHNSON, FERNEY RODRIGUEZ, and LUIS QUIROGA. "QUANTUM COHERENCE, CORRELATED NOISE AND PARRONDO GAMES." Fluctuation and Noise Letters 02, no. 04 (December 2002): L293—L298. http://dx.doi.org/10.1142/s0219477502000920.

Full text
Abstract:
We discuss the effect of correlated noise on the robustness of quantum coherent phenomena. First we consider a simple, toy model to illustrate the effect of such correlations on the decoherence process. Then we show how decoherence rates can be suppressed using a Parrondo-like effect. Finally, we report the results of many-body calculations in which an experimentally-measurable quantum coherence phenomenon is significantly enhanced by non-Markovian dynamics arising from the noise source.
APA, Harvard, Vancouver, ISO, and other styles
17

Zhu, Zhongzhu, Han Xu, Lingfei Hu, Ming Li, Peng Liu, Yuhui Dong, and Liang Zhou. "A wave optics model for the effect of partial coherence on coherent diffractive imaging." Journal of Synchrotron Radiation 28, no. 2 (January 14, 2021): 499–504. http://dx.doi.org/10.1107/s1600577520015684.

Full text
Abstract:
With the development of fourth-generation synchrotron sources, coherent diffractive imaging (CDI) will be a mainstream method for 3D structure determination at nanometre resolution. The partial coherence of incident X-rays plays a critical role in the reconstructed image quality. Here a wave optics model is proposed to analyze the effect of partial coherence on CDI for an actual beamline layout, based on the finite size of the source and the influence of the optics on the wavefront. Based on this model, the light field distribution at any plane, the coherence between any two points on this plane and CDI experiments can be simulated. The plane-wave CDI simulation result also shows that in order to reconstruct good image quality of complex samples the visibility of the interference fringes of any two points in the horizontal and vertical directions of the incident light field at the sample needs to be higher than 0.95.
APA, Harvard, Vancouver, ISO, and other styles
18

Barrachina, Raúl O., Francisco Navarrete, and Marcelo F. Ciappina. "Atomic Concealment Due to Loss of Coherence of the Incident Beam of Projectiles in Collision Processes." Atoms 9, no. 1 (January 15, 2021): 5. http://dx.doi.org/10.3390/atoms9010005.

Full text
Abstract:
In the study of collision processes, a series of conditions is usually assumed. One of them is that the beam of projectiles is coherent in lengths greater than those of the targets against which it strikes. However, recent experimental results and theoretical analyzes have shown that this assumption can not only fail, but that it is possible to manipulate the coherence length experimentally to go from a coherent situation to an incoherent one. The most conspicuous and studied manifestation of such loss of coherence is the disappearance of interference effects. However, in the present work we show that a strong decrease can also occur in the magnitude of the cross section, not only differential but also total, due to an atomic concealment effect.
APA, Harvard, Vancouver, ISO, and other styles
19

Jabczynski, Jan K., and Przemyslaw Gontar. "Effect of beam profile and partial coherence on coherent beam combining performance." Optics Communications 442 (July 2019): 40–45. http://dx.doi.org/10.1016/j.optcom.2019.02.063.

Full text
APA, Harvard, Vancouver, ISO, and other styles
20

Li, Chang Wei, Xiao Ping Kang, and Zhong He. "Changes in the Beam Parameters of Partially Coherent Sinh-Gaussian Beams after Passage through an Astigmatic Lens." Applied Mechanics and Materials 738-739 (March 2015): 434–39. http://dx.doi.org/10.4028/www.scientific.net/amm.738-739.434.

Full text
Abstract:
Based on the propagation law of partially coherent beams, the analytical expression of the beam width, waist positions and the far-field divergence angle of partially coherent sinh-Gaussian (ShG) beams through an astigmatic lens were derived. The effect of astigmatism and spatial coherence parameter on the beam parameters was mainly analyzed. It is found that the beam width depends on the astigmatic coefficient, spatial coherence parameter, decentered parameter, fresnel number and propagation distance in general. The astigmatism results in a difference between the beam widths, waist positions and far-field divergence angles in thexandydirections.
APA, Harvard, Vancouver, ISO, and other styles
21

Thomschewski, Aljoscha, Eugen Trinka, and Julia Jacobs. "Temporo-Frontal Coherences and High-Frequency iEEG Responses during Spatial Navigation in Patients with Drug-Resistant Epilepsy." Brain Sciences 11, no. 2 (January 26, 2021): 162. http://dx.doi.org/10.3390/brainsci11020162.

Full text
Abstract:
The prefrontal cortex and hippocampus function in tight coordination during multiple cognitive processes. During spatial navigation, prefrontal neurons are linked to hippocampal theta oscillations, presumably in order to enhance communication. Hippocampal ripples have been suggested to reflect spatial memory processes. Whether prefrontal-hippocampal-interaction also takes place within the ripple band is unknown. This intracranial EEG study aimed to investigate whether ripple band coherences can also be used to show this communication. Twelve patients with epilepsy and intracranial EEG evaluation completed a virtual spatial navigation task. We calculated ordinary coherence between prefrontal and temporal electrodes during retrieval, re-encoding, and pre-task rest. Coherences were compared between the conditions via permutation testing. Additionally, ripples events were automatically detected and changes in occurrence rates were investigated excluding ripples on epileptic spikes. Ripple-band coherences yielded no general effect of the task on coherences across all patients. Furthermore, we did not find significant effects of task conditions on ripple rates. Subsequent analyses pointed to rather short periods of synchrony as opposed to general task-related changes in ripple-band coherence. Specifically designed tasks and adopted measures might be necessary in order to map these interactions in future studies.
APA, Harvard, Vancouver, ISO, and other styles
22

Mančal, Tomáš, Leonas Valkunas, Elizabeth L. Read, Gregory S. Engel, Tessa R. Calhoun, and Graham R. Fleming. "Electronic coherence transfer in photosynthetic complexes and its signatures in optical spectroscopy." Spectroscopy 22, no. 2-3 (2008): 199–211. http://dx.doi.org/10.1155/2008/714573.

Full text
Abstract:
Effects of electronic coherence transfer after photoexcitation of excitonic complexes and their manifestation in optical spectroscopy are discussed. A general excitonic model Hamiltonian is considered in detail to elucidate the origin of energy relaxation in excitonic complexes. We suggest that the second-order quantum master equation for the reduced density matrix of electronic degrees of freedom provides the most suitable theoretical framework for the study of coherence transfer in photosynthetic bacteriochlorophyll complexes. Temperature dependence of the absorption band maximum of a simple excitonic dimer is interpreted in terms of coherence transfer between two excited states. The role of reorganization energy of the transitions in the magnitude of the effect is discussed. A large reorganization energy difference between the two states is found to induce significant band shift. The predictions of the theory are compared to experimental measurements of the bacterial reaction center absorption spectra ofRhodobacter sphaeroidesAs an example of a time-dependent spectroscopic method sensitive to coherences and possibly to their transfer, we present recent two-dimensional photon echo measurements of energy relaxation in the so-called Fenna–Matthews–Olson complex ofChlorobium tepidum, where distinct oscillatory patters predicted to be signatures of electronic coherence have been observed.
APA, Harvard, Vancouver, ISO, and other styles
23

Meng, Xiangyu, Xianbo Shi, Yong Wang, Ruben Reininger, Lahsen Assoufid, and Renzhong Tai. "Mutual optical intensity propagation through non-ideal mirrors." Journal of Synchrotron Radiation 24, no. 5 (August 18, 2017): 954–62. http://dx.doi.org/10.1107/s1600577517010281.

Full text
Abstract:
The mutual optical intensity (MOI) model is extended to include the propagation of partially coherent radiation through non-ideal mirrors. The propagation of the MOI from the incident to the exit plane of the mirror is realised by local ray tracing. The effects of figure errors can be expressed as phase shifts obtained by either the phase projection approach or the direct path length method. Using the MOI model, the effects of figure errors are studied for diffraction-limited cases using elliptical cylinder mirrors. Figure errors with low spatial frequencies can vary the intensity distribution, redistribute the local coherence function and distort the wavefront, but have no effect on the global degree of coherence. The MOI model is benchmarked againstHYBRIDand the multi-electronSynchrotron Radiation Workshop(SRW) code. The results show that the MOI model gives accurate results under different coherence conditions of the beam. Other than intensity profiles, the MOI model can also provide the wavefront and the local coherence function at any location along the beamline. The capability of tuning the trade-off between accuracy and efficiency makes the MOI model an ideal tool for beamline design and optimization.
APA, Harvard, Vancouver, ISO, and other styles
24

Srinath, Ramanujan, and Supratim Ray. "Effect of amplitude correlations on coherence in the local field potential." Journal of Neurophysiology 112, no. 4 (August 15, 2014): 741–51. http://dx.doi.org/10.1152/jn.00851.2013.

Full text
Abstract:
Neural activity across the brain shows both spatial and temporal correlations at multiple scales, and understanding these correlations is a key step toward understanding cortical processing. Correlation in the local field potential (LFP) recorded from two brain areas is often characterized by computing the coherence, which is generally taken to reflect the degree of phase consistency across trials between two sites. Coherence, however, depends on two factors—phase consistency as well as amplitude covariation across trials—but the spatial structure of amplitude correlations across sites and its contribution to coherence are not well characterized. We recorded LFP from an array of microelectrodes chronically implanted in the primary visual cortex of monkeys and studied correlations in amplitude across electrodes as a function of interelectrode distance. We found that amplitude correlations showed a similar trend as coherence as a function of frequency and interelectrode distance. Importantly, even when phases were completely randomized between two electrodes, amplitude correlations introduced significant coherence. To quantify the contributions of phase consistency and amplitude correlations to coherence, we simulated pairs of sinusoids with varying phase consistency and amplitude correlations. These simulations confirmed that amplitude correlations can significantly bias coherence measurements, resulting in either over- or underestimation of true phase coherence. Our results highlight the importance of accounting for the correlations in amplitude while using coherence to study phase relationships across sites and frequencies.
APA, Harvard, Vancouver, ISO, and other styles
25

Mallick, Subha Prakash, Yu-Heng Hong, Lih-Ren Chen, Tsung Sheng Kao, and Tien-Chang Lu. "Effect of Passivation Layer on the Thin Film Perovskite Random Lasers." Materials 13, no. 10 (May 18, 2020): 2322. http://dx.doi.org/10.3390/ma13102322.

Full text
Abstract:
Novel functionalities of disorder-induced scattering effect in random lasers, attributed to low spatial coherence, draw remarkable attention in high-contrast to superior quality speckle-free imaging applications. This paper demonstrates perovskite-polystyrene (PS)-based random lasing action with robust optical performance at room temperature. Optical characterizations are carried out upon perovskite thin films addition with polystyrene of different mixing concentrations (wt.%). A low threshold lasing operation is achieved with an increasing concentration of polystyrene, accompanying a wavy surface texture with high surface roughness. The rough surface dominating multiple scattering effects leads to enhanced feedback efficiency. Moreover, this study also elucidates efficient fabrication process steps for the development of high quality and durable PS-based random lasers. With the advantages of reduced coherent artifacts and low spatial coherence, speckle free projection images of the USAF (U. S. Air Force MIL-STD-150A standard of 1951) resolution test chart are shown for different PS-based random lasers.
APA, Harvard, Vancouver, ISO, and other styles
26

García, Erica C. "Measured Coherence." Coherence and Anaphora 10 (January 1, 1996): 139–60. http://dx.doi.org/10.1075/bjl.10.10gar.

Full text
Abstract:
Abstract. This paper reports on an experiment carried out with six groups of Latin-American college students. Subjects were presented with stimulus sentences with a gap produced by the removal, from an original sentence, of an anaphor (si) or a deictic (él). They were asked to fill in the gap. Two contexts were distinguished; the 'micro-context' provided by the presence vs. absence of the word mismo, and the 'macro-context', made up ofthe remainder of the stimulus. It turned out that the effect of the 'macro-context' is less than that of the 'mini-context', but that the very notion of a 'mini-context' is questionable, since si mismo may be processed as a single unit.
APA, Harvard, Vancouver, ISO, and other styles
27

Zhao Jian-Dong and Xin Jie. "Coherence effect of high excited state atoms." Acta Physica Sinica 61, no. 19 (2012): 193302. http://dx.doi.org/10.7498/aps.61.193302.

Full text
APA, Harvard, Vancouver, ISO, and other styles
28

Yi, Xianmin, and Pochi Yeh. "Effect of partial coherence on phase conjugation." Optics Communications 147, no. 1-3 (February 1998): 126–30. http://dx.doi.org/10.1016/s0030-4018(97)00657-3.

Full text
APA, Harvard, Vancouver, ISO, and other styles
29

Marty, B., M. Bourguignon, M. Op de Beeck, V. Wens, S. Goldman, P. Van Bogaert, V. Jousmäki, and X. De Tiège. "Effect of movement rate on corticokinematic coherence." Neurophysiologie Clinique/Clinical Neurophysiology 45, no. 6 (December 2015): 469–74. http://dx.doi.org/10.1016/j.neucli.2015.09.002.

Full text
APA, Harvard, Vancouver, ISO, and other styles
30

Kwas, Michelle, Michael Von Grünau, and Stéphane Dubé. "The effect of disparity on motion coherence." Spatial Vision 7, no. 3 (1993): 227–41. http://dx.doi.org/10.1163/156856893x00388.

Full text
APA, Harvard, Vancouver, ISO, and other styles
31

González, Gabriel, and Michael N. Leuenberger. "Magnetic quantum coherence effect in Ni4molecular transistors." Journal of Physics: Condensed Matter 26, no. 27 (June 11, 2014): 275302. http://dx.doi.org/10.1088/0953-8984/26/27/275302.

Full text
APA, Harvard, Vancouver, ISO, and other styles
32

Mason, T. E., A. Schröder, G. Aeppli, H. A. Mook, and S. M. Hayden. "New Magnetic Coherence Effect in SuperconductingLa2−xSrxCuO4." Physical Review Letters 77, no. 8 (August 19, 1996): 1604–7. http://dx.doi.org/10.1103/physrevlett.77.1604.

Full text
APA, Harvard, Vancouver, ISO, and other styles
33

Abliz, Melike, Masato Hedo, Jiro Kitagawa, Yoshiya Uwatoko, and Masayasu Ishikawa. "Pressure induced Kondo coherence effect in Ce2Pd3Si5." Journal of Alloys and Compounds 408-412 (February 2006): 241–43. http://dx.doi.org/10.1016/j.jallcom.2005.04.029.

Full text
APA, Harvard, Vancouver, ISO, and other styles
34

Ojeda-Castañeda, J., J. Ibarra, and J. C. Barreiro. "Noncoherent Talbot effect: Coherence theory and applications." Optics Communications 71, no. 3-4 (May 1989): 151–55. http://dx.doi.org/10.1016/0030-4018(89)90417-3.

Full text
APA, Harvard, Vancouver, ISO, and other styles
35

Ya Su, Ya Su, Zhuo Meng Zhuo Meng, Longzhi Wang Longzhi Wang, Haimin Yu Haimin Yu, and Tiegen Liu Tiegen Liu. "Effect of temperature on noninvasive blood glucose monitoring in vivo using optical coherence tomography." Chinese Optics Letters 12, no. 11 (2014): 111701–5. http://dx.doi.org/10.3788/col201412.111701.

Full text
APA, Harvard, Vancouver, ISO, and other styles
36

Haug, Hartmut. "Quantum Coherence in Ultrafast Semiconductor Spectroscopy." Journal of Nonlinear Optical Physics & Materials 07, no. 02 (June 1998): 227–39. http://dx.doi.org/10.1142/s0218863598000193.

Full text
Abstract:
Coherent optical phenomena such as the optical Stark effect, Rabi flopping, photon echo and quantum beating which are well-known in atomic spectroscopy can also be observed in semiconductors by using femtosecond laser pulses. On these short time scales, the quantum coherence of the optical excitations in the solid do not only influence the optical properties but change at the same time the relaxation and dephasing kinetics. The quasi-classical Boltzmann kinetics has to be replaced by quantum kinetics. Coherence leads to the appearance of memory in the scattering integrals. For femtosecond four-wave mixing and pump-and-probe spectroscopy the use of quantum kinetics for LO-phonon and for carrier-carrier scattering will be reviewed.
APA, Harvard, Vancouver, ISO, and other styles
37

DUAN, L., I. BEEKMAN, and M. P. MARTÍN. "Direct numerical simulation of hypersonic turbulent boundary layers. Part 2. Effect of wall temperature." Journal of Fluid Mechanics 655 (May 13, 2010): 419–45. http://dx.doi.org/10.1017/s0022112010000959.

Full text
Abstract:
In this paper, we perform direct numerical simulation (DNS) of turbulent boundary layers at Mach 5 with the ratio of wall-to-edge temperature Tw/Tδ from 1.0 to 5.4 (Cases M5T1 to M5T5). The influence of wall cooling on Morkovin's scaling, Walz's equation, the standard and modified strong Reynolds analogies, turbulent kinetic energy budgets, compressibility effects and near-wall coherent structures is assessed. We find that many of the scaling relations used to express adiabatic compressible boundary-layer statistics in terms of incompressible boundary layers also hold for non-adiabatic cases. Compressibility effects are enhanced by wall cooling but remain insignificant, and the turbulence dissipation remains primarily solenoidal. Moreover, the variation of near-wall streaks, iso-surface of the swirl strength and hairpin packets with wall temperature demonstrates that cooling the wall increases the coherency of turbulent structures. We present the mechanism by which wall cooling enhances the coherence of turbulence structures, and we provide an explanation of why this mechanism does not represent an exception to the weakly compressible hypothesis.
APA, Harvard, Vancouver, ISO, and other styles
38

Safrani, Avner, and Ibrahim Abdulhalim. "Spatial coherence effect on layer thickness determination in narrowband full-field optical coherence tomography." Applied Optics 50, no. 18 (June 16, 2011): 3021. http://dx.doi.org/10.1364/ao.50.003021.

Full text
APA, Harvard, Vancouver, ISO, and other styles
39

Lyapilin, I. I. "Spin Hall Effect Induced by Sound." Solid State Phenomena 190 (June 2012): 117–20. http://dx.doi.org/10.4028/www.scientific.net/ssp.190.117.

Full text
Abstract:
Transport of electronic spins in low-dimensional and nanoscale systems is the subject of thenovel and quickly developing eld of spintronics. The possibility of coherent spin manipulationrepresents an ultimate goal of this eld. Typically, spin transport is strongly aected by couplingof spin and orbital degrees of freedom. The inuence of the spin orbit interaction is twofold.The momentum relaxation due to the scattering of carriers, inevitably leads to spin relaxationand destroys the spin coherence. On the other hand, the controlled orbital motion of carrierscan result in a coherent motion of their spins. Thus, the spin orbit coupling is envisaged as apossible tool for spin controling in electronic devices. In particular, it is possible to generatespin polarization and spin currents by applying electric eld, the phenomenon known as thespin-Hall eect (SHE) [1- 3]. The eect is manifested in the form of a spin current directedperpendicular to the normal current, which takes place in an electric eld.
APA, Harvard, Vancouver, ISO, and other styles
40

Winter, William R., Paul L. Nunez, Jian Ding, and Ramesh Srinivasan. "Comparison of the effect of volume conduction on EEG coherence with the effect of field spread on MEG coherence." Statistics in Medicine 26, no. 21 (2007): 3946–57. http://dx.doi.org/10.1002/sim.2978.

Full text
APA, Harvard, Vancouver, ISO, and other styles
41

Pan, Liu Zhan, Chao Liang Ding, Jie Hui Yang, and Xiao Yuan. "Propagation Properties of Partially Polarized Gaussian Schell-Model Beams through an Aperture Lens with Spherical Aberration." Key Engineering Materials 364-366 (December 2007): 1180–86. http://dx.doi.org/10.4028/www.scientific.net/kem.364-366.1180.

Full text
Abstract:
Based on the beam coherence-polarization (BCP) matrix approach and propagation law of partially coherent beams, the propagation properties of partially polarized Gaussian Schell-model (PGSM) beams through an aperture lens with spherical aberration were studied. Our main attention was focused on the effect of spherical aberration of the lens, partial coherence, aperture diffraction and polarization on the behavior of the irradiance. The numerical calculation results are given to illustrate how these parameters affect the focusing properties. A comparison with the previous publications is also made, showing some extension has been made in our work.
APA, Harvard, Vancouver, ISO, and other styles
42

Zhu, Xue Guang. "Direction Finding of Multiple Coherent Signals Based on Frequency Domain Sample Process." Advanced Materials Research 815 (October 2013): 99–103. http://dx.doi.org/10.4028/www.scientific.net/amr.815.99.

Full text
Abstract:
In the field of communication direction finding by using antenna array, multi path effect arouses great attention. It not only increases the number of arriving waves, but the multi arriving signals are coherent. In order to solve the problem brought by multi path effect, much more elements are needed for multi arrival direction estimation after cancelling coherence processing which also requires more elements by spatial smoothing method. The method of frequency domain process is used in this paper to reduce the coherence between signals. The principal reason is that there is various wave distance difference between the multi arriving waves. The phase lag is not the same for different arriving path. Therefore we can adopt wide band receive process. The spatial vectors for different frequency component are not coherent, so it needs less elements for the array in the same case. The simulation results prove it is practical.
APA, Harvard, Vancouver, ISO, and other styles
43

Peng, Kuangding. "The Solitary Wave Model of Superconductivity." International Journal of Modern Physics B 12, no. 29n31 (December 20, 1998): 2950–53. http://dx.doi.org/10.1142/s0217979298001836.

Full text
Abstract:
In metals and compounds there exist small regions in which the phases of electron-pair waves are coherent. These regions are called superconducting domains (SD). At temperatures lower than T c , these regions connect with each other and form a superconductor. The electron-pairs are partially bound pairs formed by electromagnetic interactions. Coherence gives rise to solitary waves and the Josephson effect. Ideal conductivity and the Meissner effect follow from these. The different effects of lattice vibrations on low and high-T c superconductors are explained as well.
APA, Harvard, Vancouver, ISO, and other styles
44

Naumenko, Gennady A., Vitold V. Bleko, and Veronika V. Soboleva. "Features of Edge Effect of Coherent Synchrotron Radiation of Relativistic Electrons." Advanced Materials Research 1084 (January 2015): 234–40. http://dx.doi.org/10.4028/www.scientific.net/amr.1084.234.

Full text
Abstract:
This paper considers the features of coherent synchrotron radiation generated when relativistic electron bunches pass the field of short magnets. A significant contribution to the spectral and angular characteristics of radiation can be made by a factor of the limited length of the magnetic field disposed along the trajectory of the electrons. Furthermore, a substantial contribution to these features can be made by a radiation coherence factor. This work comprises the theoretical analysis of these effects and the results of experimental studies in the millimeter wavelength range
APA, Harvard, Vancouver, ISO, and other styles
45

Ya Su, Ya Su, X. Steve Yao X. Steve Yao, Zhuo Meng Zhuo Meng, Longzhi Wang Longzhi Wang, Haimin Yu Haimin Yu, and Tiegen Liu Tiegen Liu. "Effect of temperature on noninvasive blood glucose monitoring in vivo using optical coherence tomography-corrigendum." Chinese Optics Letters 12, no. 12 (2014): 123501. http://dx.doi.org/10.3788/col201412.123501.

Full text
APA, Harvard, Vancouver, ISO, and other styles
46

Pu, Jixiong, Shojiro Nemoto, and Xiaoyun Liu. "Beam shaping of focused partially coherent beams by use of the spatial coherence effect." Applied Optics 43, no. 28 (October 1, 2004): 5281. http://dx.doi.org/10.1364/ao.43.005281.

Full text
APA, Harvard, Vancouver, ISO, and other styles
47

Klychkova, D. M., and V. P. Ryabukho. "Spatial spectrum of coherence signal for a defocused object images in digital holographic microscopy with partially spatially coherent illumination." Computer Optics 42, no. 3 (July 25, 2018): 414–23. http://dx.doi.org/10.18287/2412-6179-2018-42-3-414-423.

Full text
Abstract:
We study the effect of a decrease in the magnitude of the coherence signal in high-frequency spatial spectrum for a defocused object image in transmission digital holographic microscopy with quasimonochromatic partially spatially coherent illumination. A theoretical description and results of the numerical simulation of the effect for a point scattering object are presented. The effect is experimentally studied by illuminating layered quasi-point scatterers with partially spatially coherent laser light obtained using a moving scatterer. The comparison of the experimental and theorybased numerical results shows them to be in good agreement.
APA, Harvard, Vancouver, ISO, and other styles
48

Castronovo, Anna Margherita, Cristiano De Marchis, Maurizio Schmid, Silvia Conforto, and Giacomo Severini. "Effect of Task Failure on Intermuscular Coherence Measures in Synergistic Muscles." Applied Bionics and Biomechanics 2018 (June 3, 2018): 1–13. http://dx.doi.org/10.1155/2018/4759232.

Full text
Abstract:
The term “task failure” describes the point when a person is not able to maintain the level of force required by a task. As task failure approaches, the corticospinal command to the muscles increases to maintain the required level of force in the face of a decreased mechanical efficacy. Nevertheless, most motor tasks require the synergistic recruitment of several muscles. How this recruitment is affected by approaching task failure is still not clear. The increase in the corticospinal drive could be due to an increase in synergistic recruitment or to overlapping commands sent to the muscles individually. Herein, we investigated these possibilities by combining intermuscular coherence and synergy analysis on signals recorded from three muscles of the quadriceps during dynamic leg extension tasks. We employed muscle synergy analysis to investigate changes in the coactivation of the muscles. Three different measures of coherence were used. Pooled coherence was used to estimate the command synchronous to all three muscles, pairwise coherence the command shared across muscle pairs and residual coherence the command peculiar to each couple of muscles. Our analysis highlights an overall decrease in synergistic command at task failure and an intensification of the contribution of the nonsynergistic shared command.
APA, Harvard, Vancouver, ISO, and other styles
49

Stein, Daniel M., Gadi Wollstein, Hiroshi Ishikawa, Ellen Hertzmark, Robert J. Noecker, and Joel S. Schuman. "Effect of Corneal Drying on Optical Coherence Tomography." Ophthalmology 113, no. 6 (June 2006): 985–91. http://dx.doi.org/10.1016/j.ophtha.2006.02.018.

Full text
APA, Harvard, Vancouver, ISO, and other styles
50

Riddle, C. Nicholas, Mark R. Baker, and Stuart N. Baker. "The effect of carbamazepine on human corticomuscular coherence." NeuroImage 22, no. 1 (May 2004): 333–40. http://dx.doi.org/10.1016/j.neuroimage.2003.12.040.

Full text
APA, Harvard, Vancouver, ISO, and other styles
You might also be interested in the bibliographies on the topic 'Coherence effect' for other source types:
Dissertations / Theses Books
We offer discounts on all premium plans for authors whose works are included in thematic literature selections. Contact us to get a unique promo code!

To the bibliography