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Cross-frequency coupling

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https://www.readbyqxmd.com/read/29146219/sexual-function-in-couples-with-or-without-female-incontinent-partners-correlates-and-predictors
#1
Renly Lim, Men Long Liong, Wing Seng Leong, Nurzalina Abdul Karim Khan, Kah Hay Yuen
OBJECTIVE: To evaluate the correlation between sexual function of couples with and without stress urinary incontinence (SUI) partners, and to identify predictors of poor sexual function. METHODS: A cross-sectional survey was conducted involving sexually active females with or without SUI aged at least 21 years old, and their respective partners. Both partners completed the Golombok Rust Inventory of Sexual Satisfaction (GRISS), a 28-item multidimensional measure with separate forms for male and female designed to assess sexual satisfaction of both partners...
November 13, 2017: Urology
https://www.readbyqxmd.com/read/29141439/double-cross-polarization-for-the-indirect-detection-of-nitrogen-14-nuclei-in-magic-angle-spinning-nmr-spectroscopy
#2
Diego Carnevale, Xiao Ji, Geoffrey Bodenhausen
Nitrogen-14 NMR spectra at fast magic-angle spinning rates can be acquired indirectly by means of two-dimensional techniques based on double cross polarization transfer (1)H → (14)N →(1)H. Experimental evidence is given for polycrystalline samples of glycine, l-histidine, and the dipeptide Ala-Gly. Either one-bond or long-range correlations can be favored by choosing the length of the cross polarization contact pulses. Longer contact pulses allow the detection of unprotonated nitrogen sites. In contrast to earlier methods that exploited second-order quadrupolar/dipolar cross-terms, cross polarization operates in the manner of the method of Hartmann and Hahn, even for (14)N quadrupolar couplings up to 4 MHz...
November 14, 2017: Journal of Chemical Physics
https://www.readbyqxmd.com/read/29131954/ultrafast-wiggling-and-jiggling-ir2-1-8-diisocyanomenthane-4-2
#3
Martin Pizl, Bryan M Hunter, Gregory M Greetham, Michael Towrie, Stanislav Zalis, Harry B Gray, Antonin Vlcek
Binuclear complexes of d8 metals (PtII, IrI, RhI, ) exhibit diverse photonic behavior including dual emission from relatively long-lived singlet and triplet excited states, as well as photochemical energy-, electron-, and atom transfer. Time-resolved optical spectroscopic and X-ray studies have revealed the behavior of the dimetallic core, confirming that M-M bonding is strengthened upon d*p excitation. We report the bridging ligand dynamics of Ir2(1,8-diisocyanomenthane)42+ (Ir(dimen)), investigated by fs-ns time-resolved IR spectroscopy (TRIR) in the region of CN stretching vibrations, (CN), 2000-2300 cm-1...
November 13, 2017: Journal of Physical Chemistry. A
https://www.readbyqxmd.com/read/29097049/the-absence-of-resting-state-high-gamma-cross-frequency-coupling-in-patients-with-tinnitus
#4
Min-Hee Ahn, Sung Kwang Hong, Byoung-Kyong Min
Tinnitus is a psychoacoustic phantom perception of currently unknown neuropathology. Despite a growing number of post-stimulus tinnitus studies, uncertainty still exists regarding the neural signature of tinnitus in the resting-state brain. In the present study, we used high-gamma cross-frequency coupling and a Granger causality analysis to evaluate resting-state electroencephalographic (EEG) data in healthy participants and patients with tinnitus. Patients with tinnitus lacked robust frontal delta-phase/central high-gamma-amplitude coupling that was otherwise clearly observed in healthy participants...
October 30, 2017: Hearing Research
https://www.readbyqxmd.com/read/29092526/evaluation-of-low-frequency-operational-limit-of-proposed-iter-low-field-side-reflectometer-waveguide-run-including-miter-bends
#5
G Wang, W A Peebles, E J Doyle, N A Crocker, C Wannberg, C Lau, G R Hanson, J L Doane
The present design concept for the ITER low-field-side reflectometer transmission line (TL) consists of an ∼40 m long, 6.35 cm diameter helically corrugated waveguide (WG) together with ten 90° miter bends. This paper presents an evaluation of the TL performance at low frequencies (33-50 GHz) where the predicted HE11 mode ohmic and mode conversion losses start to increase significantly. Quasi-optical techniques were used to form a near Gaussian beam to efficiently couple radiation in this frequency range into the WG...
October 2017: Review of Scientific Instruments
https://www.readbyqxmd.com/read/29084088/intracochlear-measurements-of-interaural-time-and-level-differences-conveyed-by-bilateral-bone-conduction-systems
#6
Nyssa F Farrell, Renee M Banakis Hartl, Victor Benichoux, Andrew D Brown, Stephen P Cass, Daniel J Tollin
HYPOTHESIS: Intracochlear pressures (PIC) and stapes velocity (Vstap) elicited by bilaterally placed bone-anchored hearing devices (BAHD) will be systematically modulated by imposed interaural time (ITD) and level differences (ILD), demonstrating the potential for users of bilateral BAHD to access these binaural cues. BACKGROUND: BAHD are traditionally implanted unilaterally under the assumption that transcranial cross-talk limits interaural differences. Recent studies have demonstrated improvements in binaural and spatial performance with bilateral BAHD; however, objective measures of binaural cues from bilateral BAHDs are lacking...
December 2017: Otology & Neurotology
https://www.readbyqxmd.com/read/29082205/sperm-dna-fragmentation-testing-a-cross-sectional-survey-on-current-practices-of-fertility-specialists
#7
Ahmad Majzoub, Ashok Agarwal, Chak-Lam Cho, Sandro C Esteves
BACKGROUND: Sperm DNA fragmentation (SDF) testing has been recognized as a valuable tool in the evaluation of infertile men. Despite that, its routine use in clinical practice is still hampered by the lack of understanding of the specific clinical scenarios where SDF testing is most beneficial. The aim of this study was to investigate fertility specialists evaluation of infertility of SDF testing in the context of male infertility evaluation and assisted reproductive technology. METHODS: A questionnaire was developed to survey the major aspects of SDF testing and was mailed to specialists with demonstrated clinical experience in the field of infertility...
September 2017: Translational Andrology and Urology
https://www.readbyqxmd.com/read/29079799/emergence-of-early-alterations-in-network-oscillations-and-functional-connectivity-in-a-tau-seeding-mouse-model-of-alzheimer-s-disease-pathology
#8
A Ahnaou, D Moechars, L Raeymaekers, R Biermans, N V Manyakov, A Bottelbergs, C Wintmolders, K Van Kolen, T Van De Casteele, J A Kemp, W H Drinkenburg
Synaptic dysfunction and disconnectivity are core deficits in Alzheimer's disease (AD), preceding clear changes in histopathology and cognitive functioning. Here, the early and late effects of tau pathology induction on functional network connectivity were investigated in P301L mice. Multichannel EEG oscillations were used to compute (1) coherent activity between the prefrontal cortex (PFC) and hippocampus (HPC) CA1-CA3 networks; (2) phase-amplitude cross frequency coupling (PAC) between theta and gamma oscillations, which is instrumental in adequate cognitive functioning; (3) information processing as assessed by auditory evoked potentials and oscillations in the passive oddball mismatch negativity-like (MMN) paradigm...
October 27, 2017: Scientific Reports
https://www.readbyqxmd.com/read/29073734/near-field-three-dimensional-planar-millimeter-wave-holographic-imaging-by-using-frequency-scaling-algorithm
#9
Ye Zhang, Bin Deng, Qi Yang, Jingkun Gao, Yuliang Qin, Hongqiang Wang
In this paper, a fast three-dimensional (3-D) frequency scaling algorithm (FSA) with large depth of focus is presented for near-field planar millimeter-wave (MMW) holographic imaging. Considering the cross-range range coupling term which is neglected in the conventional range migration algorithm (RMA), we propose an algorithm performing the range cell migration correction for de-chirped signals without interpolation by using a 3-D frequency scaling operation. First, to deal with the cross-range range coupling term, a 3-D frequency scaling operator is derived to eliminate the space variation of range cell migration...
October 24, 2017: Sensors
https://www.readbyqxmd.com/read/29068659/interfacial-interactions-in-van-der-waals-heterostructures-of-mos2-and-graphene
#10
Hai Li, Jiang-Bin Wu, Feirong Ran, Miao-Ling Lin, Xue-Lu Liu, Yanyuan Zhao, Xin Lu, Qihua Xiong, Jun Zhang, Wei Huang, Hua Zhang, Ping-Heng Tan
Interfacial coupling between neighboring layers of van der Waals heterostructures (vdWHs), formed by vertically stacking more than two types of two-dimensional materials (2DMs), greatly affects their physical properties and device performance. Although high-resolution cross-sectional scanning tunneling electron microscopy can directly image the atomically sharp interfaces in the vdWHs, the interfacial coupling and lattice dynamics of vdWHs formed by two different types of 2DMs, such as semimetal and semiconductor, are not clear so far...
October 25, 2017: ACS Nano
https://www.readbyqxmd.com/read/29067311/mnemonic-strategy-training-of-the-elderly-at-risk-for-dementia-enhances-integration-of-information-processing-via-cross-frequency-coupling
#11
Stavros I Dimitriadis, Ioannis Tarnanas, Mark Wiederhold, Brenda Wiederhold, Magda Tsolaki, Elgar Fleisch
INTRODUCTION: We sought to identify whether intensive 10-week mobile health mnemonic strategy training (MST) could shift the resting-state brain network more toward cortical-level integration, which has recently been proven to reflect the reorganization of the brain networks compensating the cognitive decline. METHODS: One hundred fifty-eight patients with mild cognitive impairment (MCI) were selected and participated in 10-week training lasting 90 min/d of memory training...
November 2016: Alzheimer's & Dementia: Translational Research & Clinical Interventions
https://www.readbyqxmd.com/read/29064454/near-field-three-dimensional-planar-millimeter-wave-holographic-imaging-by-using-frequency-scaling-algorithm
#12
Ye Zhang, Bin Deng, Qi Yang, Jingkun Gao, Yuliang Qin, Hongqiang Wang
In this paper, a fast three-dimensional (3-D) frequency scaling algorithm (FSA) with large depth of focus is presented for near-field planar millimeter-wave (MMW) holographic imaging. Considering the cross-range range coupling term which is neglected in the conventional range migration algorithm (RMA), we propose an algorithm performing the range cell migration correction for de-chirped signals without interpolation by using a 3-D frequency scaling operation. First, to deal with the cross-range range coupling term, a 3-D frequency scaling operator is derived to eliminate the space variation of range cell migration...
October 24, 2017: Sensors
https://www.readbyqxmd.com/read/29060344/low-latency-vlsi-architecture-for-neural-cross-frequency-coupling-analysis
#13
Gerard O'Leary, Taufik A Valiante, Roman Genov
Growing evidence suggests that cross-frequency coupling (CFC) is a key mechanism in neuronal computation, communication, and learning in the brain. Abnormal CFC has been implicated in pathological brain states such as epilepsy and Parkinson's disease. A reduction in excessive coupling has been shown in effective neuromodulation treatments, suggesting that CFC may be a useful feedback measure in closed-loop neural stimulation devices. However, processing latency limits the responsiveness of such systems. A VLSI architecture is presented which implements three selectable measures of CFC to enable the application specific trade-off between low-latency and high-accuracy processing...
July 2017: Conference Proceedings: Annual International Conference of the IEEE Engineering in Medicine and Biology Society
https://www.readbyqxmd.com/read/29059900/bispectral-analysis-of-spontaneous-eeg-activity-from-patients-with-moderate-dementia-due-to-alzheimer-s-disease
#14
Carlos Gomez, Fernando Vaquerizo-Villar, Jesus Poza, Saul J Ruiz, Miguel A Tola-Arribas, Monica Cano, Roberto Hornero
Dementia due to Alzheimer's disease (AD) is a common disorder with a great impact on the patients' quality of life. The aim of this pilot study was to characterize spontaneous electroencephalography (EEG) activity in dementia due to AD using bispectral analysis. Five minutes of EEG activity were recorded from 17 patients with moderate dementia due to AD and 19 age-matched controls. Bispectrum results revealed that AD patients are characterized by an increase of phase coupling at low frequencies in comparison with controls...
July 2017: Conference Proceedings: Annual International Conference of the IEEE Engineering in Medicine and Biology Society
https://www.readbyqxmd.com/read/29046823/functionalization-of-ti-40nb-implant-material-with-strontium-by-reactive-sputtering
#15
Markus Göttlicher, Marcus Rohnke, Yannik Moryson, Jürgen Thomas, Joachim Sann, Anja Lode, Matthias Schumacher, Romy Schmidt, Stefan Pilz, Annett Gebert, Thomas Gemming, Jürgen Janek
BACKGROUND: Surface functionalization of orthopedic implants with pharmaceutically active agents is a modern approach to enhance osseointegration in systemically altered bone. A local release of strontium, a verified bone building therapeutic agent, at the fracture site would diminish side effects, which could occur otherwise by oral administration. Strontium surface functionalization of specially designed titanium-niobium (Ti-40Nb) implant alloy would provide an advanced implant system that is mechanically adapted to altered bone with the ability to stimulate bone formation...
2017: Biomaterials Research
https://www.readbyqxmd.com/read/29041411/degenerate-critical-coupling-in-all-dielectric-metasurface-absorbers
#16
Xianshun Ming, Xinyu Liu, Liqun Sun, Willie J Padilla
We develop the theory of all-dielectric absorbers based on temporal coupled mode theory (TCMT), with parameters extracted from eigenfrequency simulations. An infinite square array of cylindrical resonators embedded in air is investigated, and we find that it supports two eigenmodes of opposite symmetry that are each responsible for half of the total absorption. The even and odd eigenmodes are found to be the hybrid electric (EH111) and hybrid magnetic (HE111) waveguide modes of a dielectric wire of circular cross section, respectively...
October 2, 2017: Optics Express
https://www.readbyqxmd.com/read/29041247/resonance-coupling-and-polarization-conversion-in-terahertz-metasurfaces-with-twisted-split-ring-resonator-pairs
#17
Chenyu Li, Chun-Chieh Chang, Qingli Zhou, Cunlin Zhang, Hou-Tong Chen
We investigate edge-coupling of twisted split-ring resonator (SRR) pairs in the terahertz (THz) frequency range. Using a simple coupled-resonator model we show that such a system exhibits resonance splitting and cross-polarization conversion. Numerical simulations and experimental measurements agree well with theoretical calculations, verifying the resonance splitting as a function of the coupling strength given by the SRR separation. We further show that a metal ground plane can be integrated to significantly enhance the resonance coupling, which enables the effective control of resonance splitting and the efficiency and bandwidth of the cross-polarization conversion...
October 16, 2017: Optics Express
https://www.readbyqxmd.com/read/29041184/free-standing-double-layer-terahertz-band-pass-filters-fabricated-by-femtosecond-laser-micro-machining
#18
Yanzhang Lin, Haizi Yao, Xuewei Ju, Ying Chen, Shuncong Zhong, Xiangfeng Wang
We report on the fabrication and transmission properties of free-standing single-layer and double-layer THz bandpass filters. These filters are fabricated on aluminum foils using femtosecond laser micro-machining. The aluminum foils are periodically patterned with cross apertures with a total area of 1.75×1.75 cm(2), also known as frequency-selective surfaces. Their terahertz transmission properties were simulated using the FDTD method and measured using a time-domain terahertz spectroscopy system. The simulation results agree with the measurements results very well...
October 16, 2017: Optics Express
https://www.readbyqxmd.com/read/28983770/permutation-mutual-information-a-novel-approach-for-measuring-neuronal-phase-amplitude-coupling
#19
Ning Cheng, Qun Li, Sitong Wang, Rubin Wang, Tao Zhang
Cross-frequency phase-amplitude coupling (PAC) in neuronal oscillations network plays an important functional role in large scale neuronal communication and neuronal encoding. In the present study, a novel approach named permutation mutual information (PMI) was applied in measuring PAC. It is derived from the permutation entropy based on the mutual information theory, by which the mutual information of permutations of two time series can be evaluated. In order to verify the ability of PMI, a numerical test was performed by using both simulation data and experimental data...
October 5, 2017: Brain Topography
https://www.readbyqxmd.com/read/28976354/exciton-transport-in-the-pe545-complex-insight-from-atomistic-qm-mm-based-quantum-master-equations-and-elastic-network-models
#20
Sima Pouyandeh, Stefano Iubini, Sandro Jurinovich, Yasser Omar, Benedetta Mennucci, Francesco Piazza
In this paper we work out a parameterization of the environment noise within the Haken-Strobl-Reinenker (HSR) model for the PE545 light-harvesting complex based on atomic-level quantum mechanics/molecular mechanics (QM/MM) simulations. We use this approach to investigate the role of different auto- and cross-correlations in the HSR noise tensor, confirming that site-energy autocorrelations (pure dephasing) terms dominate the noise-induced exciton mobility enhancement, followed by site energy-coupling cross-correlations for specific triplets of pigments...
October 4, 2017: Physical Biology
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