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https://www.readbyqxmd.com/read/27915179/axially-uniform-magnetic-field-modulation-excitation-for-electron-paramagnetic-resonance-in-rectangular-and-cylindrical-cavities-by-slot-cutting
#1
Jason W Sidabras, James E Richie, James S Hyde
In continuous-wave (CW) Electron Paramagnetic Resonance (EPR) a low-frequency time-harmonic magnetic field, called field modulation, is applied parallel to the static magnetic field and incident on the sample. Varying amplitude of the field modulation incident on the sample has consequences on spectral line-shape and line-height over the axis of the sample. Here we present a method of coupling magnetic field into the cavity using slots perpendicular to the sample axis where the slot depths are designed in such a way to produce an axially uniform magnetic field along the sample...
November 25, 2016: Journal of Magnetic Resonance
https://www.readbyqxmd.com/read/27914416/pitch-priming-in-sequences-of-two-sounds
#2
Laurent Demany, Tom Lucas, Catherine Semal
Frequency discrimination limens (FDLs) were measured for pairs of stimuli differing from each other with respect to pitch salience. One of the two stimuli to be compared within a trial was a pure tone of at least 100 ms, evoking a salient pitch, while the other stimulus consisted of only eight sinusoidal cycles (experiment 1), or was a noise band with a Gaussian spectral envelope, evoking a weak pitch corresponding to the peak frequency (experiment 2). From trial to trial, frequency was varied randomly and widely...
September 2016: Journal of the Acoustical Society of America
https://www.readbyqxmd.com/read/27914333/nano-zinc-oxide-incorporated-graphene-oxide-nanocellulose-composite-for-the-adsorption-and-photo-catalytic-degradation-of-ciprofloxacin-hydrochloride-from-aqueous-solutions
#3
T S Anirudhan, J R Deepa
Purpose of this study is to report the synthetic procedure of a novel photo catalyst, nano zinc oxide incorporated graphene oxide/nanocellulose (ZnO-GO/NC) for the effective adsorption and subsequent photo degradation of ciprofloxacin (CF), an antibiotic widely used in the poultry. Self cleaning property in cellulose was achieved by introducing a nano zinc oxide incorporated graphene oxide into nanocellulose (NC) matrix. By incorporating nano zinc oxide (ZnO) in graphene oxide (GO), band gap could be tuned to 2...
November 17, 2016: Journal of Colloid and Interface Science
https://www.readbyqxmd.com/read/27914152/pediatric-multiple-sclerosis-in-portugal-a-multicentre-study
#4
Ana Sofia Correia, Luís Augusto, Joana Meireles, Joana Pinto, Ana Paula Sousa
INTRODUCTION: Multiple sclerosis is most often diagnosed among young adults but less frequently it may present during childhood or adolescence. In Portugal, there has been only one previous single-center, pediatric multiple sclerosis study. The main objective was the evaluation of the demographic, clinical, laboratorial and neuroradiological characteristics of patients with pediatric-onset multiple sclerosis in Portugal. The secondary objectives were to compare the characteristics of childhood-onset multiple sclerosis and adolescent-onset multiple sclerosis and to characterize the treatments prescribed...
August 2016: Acta Médica Portuguesa
https://www.readbyqxmd.com/read/27913351/adaptive-multispectral-demosaicking-based-on-frequency-domain-analysis-of-spectral-correlation
#5
Sunil Jaiswal, Lu Fang, Vinit Jakhetiya, Jiahao Pang, Klaus Mueller, Oscar C Au
Color filter array (CFA) interpolation, or 3-band demosaicking, is a process of interpolating the missing color samples in each band to reconstruct a full color image. In this paper, we are concerned with the challenging problem of multispectral demosaicking, where each band is significantly undersampled due to the increment in the number of bands. Specifically, we demonstrate a frequency-domain analysis of the subsampled color-difference signal and observe that the conventional assumption of highly correlated spectral bands for estimating undersampled components is not precise...
December 1, 2016: IEEE Transactions on Image Processing: a Publication of the IEEE Signal Processing Society
https://www.readbyqxmd.com/read/27913322/automatic-detection-and-classification-of-high-frequency-oscillations-in-depth-eeg-signals
#6
Nisrine Jrad, Amar Kachenoura, Isabelle Merlet, Fabrice Bartolomei, Anca Nica, Arnaud Biraben, Fabrice Wendling
GOAL: Interictal High Frequency Oscillations (HFOs [30-600 Hz]) have proven to be relevant biomarkers in epilepsy. In this paper, four categories of HFOs are considered: Gamma ([30- 80 Hz]), High-Gamma ([80-120 Hz]), Ripples ([120-250 Hz]) and Fast-Ripples ([250-600 Hz]). A universal detector of the four types of HFOs is proposed. It has the advantages of i) classifying HFOs, and thus being robust to inter- and intra-subject variability; ii) rejecting artefacts, thus being specific. METHODS: Gabor atoms are tuned to cover the physiological bands...
November 29, 2016: IEEE Transactions on Bio-medical Engineering
https://www.readbyqxmd.com/read/27913320/the-concept-of-effective-inflow-application-to-interictal-localization-of-the-epileptogenic-focus-from-ieeg
#7
Ioannis Vlachos, Balu Krishnan, David Treiman, Konstantinos Tsakalis, Dimitris Kugiumtzis, Leon Iassemidis
GOAL: Accurate determination of the epileptogenic focus is of paramount diagnostic and therapeutic importance in epilepsy. The current gold standard for focus localization is from ictal (seizure) onset and thus requires the occurrence and recording of multiple typical seizures of a patient. Localization of the focus from seizure-free (interictal) periods remains a challenging problem, especially in the absence of interictal epileptiform activity. METHODS: By exploring the concept of effective inflow, we developed a focus localization algorithm (FLA) based on directed connectivity between brain sites...
November 29, 2016: IEEE Transactions on Bio-medical Engineering
https://www.readbyqxmd.com/read/27913190/synthesis-and-label-free-characterization-of-a-bimolecular-pna-homo-quadruplex
#8
Brunella Pinto, Giulia Rusciano, Stefano D'Errico, Nicola Borbone, Antonio Sasso, Vincenzo Piccialli, Luciano Mayol, Giorgia Oliviero, Gennaro Piccialli
BACKGROUND: G-quadruplex DNA is involved in many physiological and pathological processes. Both clinical and experimental studies on DNA G-quadruplexes are slowed down by their enzymatic instability. In this frame, more stable chemically modified analogs are needed. METHODS: The bis-end-linked-(gggt)2 PNA molecule (BEL-PNA) was synthesized using in solution and solid phase synthetic approaches. Quadruplex formation was assessed by circular dichroism (CD) and surface enhanced Raman scattering (SERS)...
November 29, 2016: Biochimica et Biophysica Acta
https://www.readbyqxmd.com/read/27911472/solid-state-emission-of-the-anthracene-o-carborane-dyad-from-the-twisted-intramolecular-charge-transfer-in-the-crystalline-state
#9
Hirofumi Naito, Kenta Nishino, Yasuhiro Morisaki, Kazuo Tanaka, Yoshiki Chujo
The emission process of the o-carborane dyad with anthracene originating from the twisted intramolecular charge transfer (TICT) state in the crystalline state is described. The anthracene-o-carborane dyad was synthesized and its optical properties were investigated. Initially, the dyad had aggregation- and crystallization-induced emission enhancement (AIEE and CIEE) properties via the intramolecular charge transfer (ICT) state. Interestingly, the dyad presented the dual-emissions assigned to both locally excited (LE) and ICT states in solution...
December 1, 2016: Angewandte Chemie
https://www.readbyqxmd.com/read/27910932/oer-activity-manipulated-by-iro6-coordination-geometry-an-insight-from-pyrochlore-iridates
#10
Wei Sun, Ji-Yuan Liu, Xue-Qing Gong, Waqas-Qamar Zaman, Li-Mei Cao, Ji Yang
The anodic reaction of oxygen evolution reaction (OER), an important point for electrolysis, however, remains the obstacle due to its complicated reaction at electrochemical interfaces. Iridium oxide (IrO2) is the only currently known 5d transition metal oxide possessing admirable OER activity. Tremendous efforts have been carried out to enhance the activity of iridium oxides. Unfortunately there lies a gap in understanding what factors responsible for the activity in doped IrO2 or the novel crystal structure...
December 2, 2016: Scientific Reports
https://www.readbyqxmd.com/read/27910862/methylphenidate-enhances-early-stage-sensory-processing-and-rodent-performance-of-a-visual-signal-detection-task
#11
Rachel L Navarra, Brian D Clark, Andrew T Gargiulo, Barry D Waterhouse
Methylphenidate (MPH) is used clinically to treat attention-deficit/hyperactivity disorder (ADHD) and off-label as a performance enhancing agent in healthy individuals. MPH enhances catecholamine transmission via blockade of norepinephrine (NE) and dopamine (DA) reuptake transporters. However, it is not clear how this action impacts neural circuits performing cognitive and sensorimotor functions driving performance enhancement. The dorsal lateral geniculate nucleus (dLGN) is the primary thalamic relay for visual information from the retina to the cortex and is densely innervated by NE-containing fibers from the locus coeruleus (LC), a pathway known to modulate state-dependent sensory processing...
December 2, 2016: Neuropsychopharmacology: Official Publication of the American College of Neuropsychopharmacology
https://www.readbyqxmd.com/read/27910430/design-of-the-2d-electron-cyclotron-emission-imaging-instrument-for-the-j-text-tokamak
#12
X M Pan, Z J Yang, X D Ma, Y L Zhu, N C Luhmann, C W Domier, B W Ruan, G Zhuang
A new 2D Electron Cyclotron Emission Imaging (ECEI) diagnostic is being developed for the J-TEXT tokamak. It will provide the 2D electron temperature information with high spatial, temporal, and temperature resolution. The new ECEI instrument is being designed to support fundamental physics investigations on J-TEXT including MHD, disruption prediction, and energy transport. The diagnostic contains two dual dipole antenna arrays corresponding to F band (90-140 GHz) and W band (75-110 GHz), respectively, and comprises a total of 256 channels...
November 2016: Review of Scientific Instruments
https://www.readbyqxmd.com/read/27910414/electron-cyclotron-emission-radiometer-upgrade-on-the-j-text-tokamak
#13
Z J Yang, X M Pan, X D Ma, B W Ruan, R B Zhou, C Zhang
To meet experimental requirements, the J-TEXT electron cyclotron emission (ECE) diagnostic is being upgraded. The front end antenna and transmission line have been modified and a new 8-channel W-band detecting unit has been developed. The improved ECE system will extend the frequency range from 94.5-124.5 GHz to 80.5-124.5 GHz. This will enable the system to cover the most plasma in the radius direction for BT = 1.8-2.2 T, and it even can cover almost the whole plasma range ρ = - 0.8-0.9 (minus means the high field side) at BT = 1...
November 2016: Review of Scientific Instruments
https://www.readbyqxmd.com/read/27908130/exploring-connections-between-statistical-mechanics-and-green-s-functions-for-realistic-systems-temperature-dependent-electronic-entropy-and-internal-energy-from-a-self-consistent-second-order-green-s-function
#14
Alicia Rae Welden, Alexander A Rusakov, Dominika Zgid
Including finite-temperature effects from the electronic degrees of freedom in electronic structure calculations of semiconductors and metals is desired; however, in practice it remains exceedingly difficult when using zero-temperature methods, since these methods require an explicit evaluation of multiple excited states in order to account for any finite-temperature effects. Using a Matsubara Green's function formalism remains a viable alternative, since in this formalism it is easier to include thermal effects and to connect the dynamic quantities such as the self-energy with static thermodynamic quantities such as the Helmholtz energy, entropy, and internal energy...
November 28, 2016: Journal of Chemical Physics
https://www.readbyqxmd.com/read/27908128/identifying-barriers-to-charge-carriers-in-the-bulk-and-surface-regions-of-cu2znsns4-nanocrystal-films-by-x-ray-absorption-fine-structures-xafss
#15
Matthew J Turnbull, Daniel Vaccarello, Yun Mui Yiu, Tsun-Kong Sham, Zhifeng Ding
Solar cell performance is most affected by the quality of the light absorber layer. For thin-film devices, this becomes a two-fold problem of maintaining a low-cost design with well-ordered nanocrystal (NC) structure. The use of Cu2ZnSnS4 (CZTS) NCs as the light absorber films forms an ideal low-cost design, but the quaternary structure makes it difficult to maintain a well-ordered layer without the use of high-temperature treatments. There is little understanding of how CZTS NC structures affect the photoconversion efficiency, the charge-carriers, and therefore the performance of the device manufactured from it...
November 28, 2016: Journal of Chemical Physics
https://www.readbyqxmd.com/read/27908064/design-of-passive-directional-acoustic-devices-using-topology-optimization-from-method-to-experimental-validation
#16
Rasmus E Christiansen, Efren Fernandez-Grande
The paper presents a topology optimization based method for designing acoustic focusing devices, capable of tailoring the sound emission pattern of one or several sources, across a chosen frequency band. The method is demonstrated numerically considering devices optimized for directional sound emission in two dimensions and is experimentally validated using three dimensional prints of the optimized designs. The emitted fields exhibit a level difference of at least 15 dB on axis relative to the off-axis directions, over frequency bands of approximately an octave...
November 2016: Journal of the Acoustical Society of America
https://www.readbyqxmd.com/read/27905592/the-conformational-landscape-of-2-4-fluoro-phenyl-ethylamine-consequences-of-fluorine-substitution-at-the-para-position
#17
Afik Shachar, Nitzan Mayorkas, Hanan Sachs, Ilana Bar
Fluorination is considered as a possible means for alteration of conformational landscapes in molecules. The effect of fluorine substitution was studied here by measuring the vibronic and vibrational spectra of gas phase 2-(4-fluoro-phenyl)-ethylamine (4-FPEA) by resonant two-photon ionization (R2PI) and by ionization-loss stimulated Raman spectroscopy (ILSRS). The measurement of survey ILSR spectra of 4-FPEA in the amino group region allowed to associate the bands in the R2PI spectrum to origin and vibronic transitions of the ground (S0) to the excited (S1) electronic states of three different conformers...
December 1, 2016: Physical Chemistry Chemical Physics: PCCP
https://www.readbyqxmd.com/read/27905585/influence-of-%C3%AF-conjugation-structural-changes-on-intramolecular-charge-transfer-and-photoinduced-electron-transfer-in-donor-%C3%AF-acceptor-dyads
#18
So-Yoen Kim, Yang-Jin Cho, Ah-Rang Lee, Ho-Jin Son, Won-Sik Han, Dae Won Cho, Sang Ook Kang
The influence of π-conjugation structural changes on photoinduced electron transfer (PET) and intramolecular charge transfer (ICT) processes in π-conjugated donor (D)-acceptor (A) dyads (D-π-A) was investigated. Three types of D-π-A dyads were prepared through the modification of the structure of their π-conjugated linker, including D-π-A (1) and D-πtw-A (2) having a twisted π-conjugation, and D-π-Si-π-A (3) with a π-conjugation severed by a Si-atom. In these dyads, carbazole (Cz) and oxadiazole (Oz) moieties act as an electron donor and acceptor, respectively...
December 1, 2016: Physical Chemistry Chemical Physics: PCCP
https://www.readbyqxmd.com/read/27904863/recent-updates-in-the-endoscopic-diagnosis-of-barrett-s-oesophagus
#19
REVIEW
Neel Sharma, Khek Yu Ho
BACKGROUND: Barrett's oesophagus (BO) is a premalignant condition associated with the development of oesophageal adenocarcinoma (OAC). Despite the low risk of progression per annum, OAC is associated with significant morbidity and mortality, with an estimated 5-year survival of 10%. Furthermore, the incidence of OAC continues to rise globally. Therefore, it is imperative to detect the premalignant phase of BO and follow up such patients accordingly. SUMMARY: The mainstay diagnosis of BO is endoscopy and biopsy sampling...
October 2016: Gastrointestinal Tumors
https://www.readbyqxmd.com/read/27903706/phase-amplitude-coupling-and-long-range-phase-synchronization-reveal-frontotemporal-interactions-during-visual-working-memory
#20
Jonathan Daume, Thomas Gruber, Andreas K Engel, Uwe Friese
: It has been suggested that cross-frequency phase-amplitude coupling (PAC) particularly in temporal brain structures serves as a neural mechanism for coordinated working memory storage. In this magnetoencephalography study, we show that during visual working memory maintenance, temporal cortex regions, which exhibit enhanced PAC, interact with prefrontal cortex via enhanced low-frequency phase synchronization. Healthy human participants were engaged in a visual delayed-matching-to-sample task with pictures of natural objects...
November 30, 2016: Journal of Neuroscience: the Official Journal of the Society for Neuroscience
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