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https://www.readbyqxmd.com/read/28503672/quantum-fluctuations-beyond-the-gutzwiller-approximation
#1
Michele Fabrizio
We present a simple scheme to evaluate linear response functions including quantum fluctuation corrections on top of the Gutzwiller approximation. The method is derived for a generic multiband lattice Hamiltonian without any assumption about the dynamics of the variational correlation parameters that define the Gutzwiller wavefunction, and which thus behave as genuine dynamical degrees of freedom that add on those of the variational uncorrelated Slater determinant. We apply the method to the standard half-filled single-band Hubbard model...
February 28, 2017: Physical Review. B
https://www.readbyqxmd.com/read/28489539/task-independent-mental-workload-classification-based-upon-common-multi-band-eeg-cortical-connectivity
#2
Georgios Dimitrakopoulos, Ioannis Kakkos, Zhongxiang Dai, Julian Lim, Joshua deSouza, Anastasios Bezerianos, Yu Sun
Efficient classification of mental workload, an important issue in neuroscience, is limited so far to single task, while cross-task classification remains a challenge. Furthermore, network approaches have emerged as a promising direction for studying the complex organization of the brain, enabling easier interpretation of various mental states. In this study, using two mental tasks (N-back and mental arithmetic), we present a framework for cross- as well as within-task workload discrimination by utilizing multiband EEG cortical brain connectivity...
May 4, 2017: IEEE Transactions on Neural Systems and Rehabilitation Engineering
https://www.readbyqxmd.com/read/28489056/meritxell-the-multifrequency-experimental-radiometer-with-interference-tracking-for-experiments-over-land-and-littoral-instrument-description-calibration-and-performance
#3
Jorge Querol, José Miguel Tarongí, Giuseppe Forte, José Javier Gómez, Adriano Camps
MERITXELL is a ground-based multisensor instrument that includes a multiband dual-polarization radiometer, a GNSS reflectometer, and several optical sensors. Its main goals are twofold: to test data fusion techniques, and to develop Radio-Frequency Interference (RFI) detection, localization and mitigation techniques. The former is necessary to retrieve complementary data useful to develop geophysical models with improved accuracy, whereas the latter aims at solving one of the most important problems of microwave radiometry...
May 10, 2017: Sensors
https://www.readbyqxmd.com/read/28468371/numerical-study-of-tunable-enhanced-chirality-in-multilayer-stack-achiral-phase-change-metamaterials
#4
Tun Cao, Yang Li, Chen-Wei Wei, Yi-Mei Qiu
We numerically demonstrate a multiband circular dichroism (CD) by tilting achiral metamaterials (MMs) composed of an elliptical nanoholes array (ENA) penetrating through metal/ phase-change material (PCM) /metal multilayer stack, with respect to the incident light. The CD spectrum can be actively tuned across a wide range from the near-infrared (NIR) to mid-infrared (MIR) regime by transiting the state of the PCM (Ge<sub>2</sub>Sb<sub>2</sub>Te<sub>5</sub>) from amorphous to crystalline...
May 1, 2017: Optics Express
https://www.readbyqxmd.com/read/28464498/minimizing-the-heat-effect-of-photodynamic-therapy-based-on-inorganic-nanocomposites-mediated-by-808-nm-near-infrared-light
#5
Ming-Hsien Chan, Yu-Ting Pan, I-Jung Lee, Chieh-Wei Chen, Yung-Chieh Chan, Michael Hsiao, Feng Wang, Lingdong Sun, Xueyuan Chen, Ru-Shi Liu
Photodynamic therapy (PDT) based on photosensitizers (PSs) constructed with nanomaterials has become popular in cancer treatment, especially oral carcinoma cell. This therapy is characterized by improved PS accumulation in tumor regions and generation of reactive oxygen species (ROS) for PDT under specific excitation. In the selection of near-infrared (NIR) window, 808 nm NIR light because it can avoid the absorption of water is particularly suitable for the application in PDT. Hence, multiband emissions under a single 808 nm near-infrared excitation of Nd(3+) -sensitized upconversion nanoparticles (808 nm UCNPs) have been applied for the PDT effect...
May 2, 2017: Small
https://www.readbyqxmd.com/read/28464456/forward-backward-switching-of-plasmonic-wave-propagation-using-sign-reversal-coupling
#6
Zhen Gao, Fei Gao, Youming Zhang, Hongyi Xu, Yu Luo, Baile Zhang
Backward waves with wave-front propagation opposite in direction to that of energy flow have attracted considerable interest in the context of photonic metamaterials. However, switching between forward and backward waves in the same frequency range has remained a challenge. Here, on a platform of coupled designer surface plasmon resonators in the microwave regime, multiband forward/backward switching of plasmonic wave propagation is demonstrated. This approach makes use of sign-reversal coupling that occurs when switching the coupling configuration between tightly confined photonic modes...
May 2, 2017: Advanced Materials
https://www.readbyqxmd.com/read/28460843/interest-of-decompression-in-orthodontics-case-report-of-a-keratocyst-during-childhood
#7
Alexandre Alpy, Laurianne Tournaire, Fréderic Vaysse, Christine Marchal-Sixou, Arnaud Lhomme, Bruno Courtois
Keratocysts, also known as keratocystic odontogenic tumors (KCOT), make up 7% of all odontogenic cysts and develop asymptomatically in most cases. Enucleation is the benchmark treatment. However, there are surgical alternatives. Marsupialization and decompression are necessary in some cases, mainly when the KCOT is large, thus causing an increased risk of bone fracture, or if it has engulfed important elements such as the inferior alveolar nerve or teeth, consequently causing alveolar bone growth failure. The authors describe the case of a nine-year-old child treated for a large keratocyst situated in sector 4 (lower right jaw), impacting both premolars and the canine (45, 44 and 43)...
April 28, 2017: International Orthodontics
https://www.readbyqxmd.com/read/28439547/tuning-across-the-bcs-bec-crossover-in-the-multiband-superconductor-fe1-y-se-x-te1-x-an-angle-resolved-photoemission-study
#8
Shahar Rinott, K B Chashka, Amit Ribak, Emile D L Rienks, Amina Taleb-Ibrahimi, Patrick Le Fevre, François Bertran, Mohit Randeria, Amit Kanigel
The crossover from Bardeen-Cooper-Schrieffer (BCS) superconductivity to Bose-Einstein condensation (BEC) is difficult to realize in quantum materials because, unlike in ultracold atoms, one cannot tune the pairing interaction. We realize the BCS-BEC crossover in a nearly compensated semimetal, Fe1+y Se x Te1-x , by tuning the Fermi energy εF via chemical doping, which permits us to systematically change Δ/εF from 0.16 to 0.50, where Δ is the superconducting (SC) gap. We use angle-resolved photoemission spectroscopy to measure the Fermi energy, the SC gap, and characteristic changes in the SC state electronic dispersion as the system evolves from a BCS to a BEC regime...
April 2017: Science Advances
https://www.readbyqxmd.com/read/28437916/multiband-selective-absorbers-made-of-1d-periodic-ag-sio-sub-2-sub-ag-core-shell-coaxial-cylinders-horizontally-lying-on-a-planar-substrate
#9
Yi Zhao, Ceji Fu
In this paper, we present a one-dimensional periodic microstructure for multiband selective absorbers of thermal radiation. The microstructure is made of Ag/SiO<sub>2</sub>/Ag core/shell coaxial cylinders horizontally lying on top of a SiO<sub>2</sub> dielectric spacer and an opaque silver substrate. The spectral-directional absorptivity of the proposed structure was numerically investigated with the finite element based Comsol Multiphysics software. Multiband selective absorption in the wavenumber range from 2500 to 20000 cm<sup>-1</sup> for TM-wave incidence was obtained...
April 17, 2017: Optics Express
https://www.readbyqxmd.com/read/28414374/practical-dual-band-terahertz-imaging-system
#10
Deliang Zhou, Liwei Hou, Wei Xie, Yuanzhang Zang, Bin Lu, Jian Chen, Peiheng Wu
This paper introduces a dual-band terahertz imaging system as a potential product for nondestructive testing using heterodyne detectors and continuous-wave sources. The operating frequencies of the system are 110.4 and 220.8 GHz. Multiband fusion technology combines the advantages of the greater spatial resolution of the high-frequency band and the enhanced sensitivity of the low-frequency band to improve the detection ability of the system. Additionally, the interference cancellation technology is used to obtain a superior image quality...
April 10, 2017: Applied Optics
https://www.readbyqxmd.com/read/28388193/bogoliubov-fermi-surfaces-in-superconductors-with-broken-time-reversal-symmetry
#11
D F Agterberg, P M R Brydon, C Timm
It is commonly believed that, in the absence of disorder or an external magnetic field, there are three possible types of superconducting excitation gaps: The gap is nodeless, it has point nodes, or it has line nodes. Here, we show that, for an even-parity nodal superconducting state which spontaneously breaks time-reversal symmetry, the low-energy excitation spectrum generally does not belong to any of these categories; instead, it has extended Bogoliubov Fermi surfaces. These Fermi surfaces can be visualized as two-dimensional surfaces generated by "inflating" point or line nodes into spheroids or tori, respectively...
March 24, 2017: Physical Review Letters
https://www.readbyqxmd.com/read/28380939/all-metal-flexible-large-area-multiband-waveplate
#12
Jingpei Hu, Yu Lin, Xiaonan Zhao, Aijiao Zhu, Chen Xu, Xiaojun Zhu, Peiji Guo, Bing Cao, Chinhua Wang
We propose and demonstrate an all-metal flexible reflective multiband waveplate based on nano-grating structure using high efficient electroplating growing process, which exhibits quarter waveplate at two wavelengths (λ = 465nm and λ = 921nm) and half waveplate at another wavelength (λ = 656nm). Using Finite Difference Time Domain (FDTD) modeling, the phase shift and reflection efficiency are simulated and designed for a variety of geometrical parameters. A fast and cost-effective technique based on conventional interference lithography and nickel electroplating process is demonstrated to fabricate the all-metal, large-area and flexible waveplate...
April 3, 2017: Optics Express
https://www.readbyqxmd.com/read/28375366/multiband-infrared-inversion-for-low-concentration-methane-monitoring-in-a-confined-dust-polluted-atmosphere
#13
Wenzheng Wang, Yanming Wang, Wujun Song, Xueqin Li
A multiband infrared diagnostic (MBID) method for methane emission monitoring in limited underground environments was presented considering the strong optical background of gas/solid attenuation. Based on spatial distribution of aerosols and complex refractive index of dust particles, forward calculations were carried out with/without methane to obtain the spectral transmittance through the participating atmosphere in a mine roadway. Considering the concurrent attenuation and absorption behavior of dust and gases, four infrared wavebands were selected to retrieve the methane concentration combined with a stochastic particle swarm optimization (SPSO) algorithm...
March 20, 2017: Applied Optics
https://www.readbyqxmd.com/read/28372079/critical-bandwidth-speech-arrays-of-subcritical-band-speech-maintain-near-ceiling-intelligibility-at-high-amplitudes
#14
Richard M Warren, James A Bashford, Peter W Lenz
Removal of transition bands from narrow speech passbands through very steep filtering has made it possible to isolate and determine (for the first time) intelligibility of critical bandwidth as well as subcritical bandwidth speech. These rectangular bands have unique intelligibilities when heard singly, paired, or in various multiband arrays spanning the speech spectrum. Thus, a particular sparse spectral array of unfamiliar everyday sentences in this study has demonstrated 98% intelligibility up to 100 dB...
March 2017: Journal of the Acoustical Society of America
https://www.readbyqxmd.com/read/28306267/multiband-one-dimensional-electronic-structure-and-spectroscopic-signature-of-tomonaga-luttinger-liquid-behavior-in-k_-2-cr_-3-as_-3
#15
M D Watson, Y Feng, C W Nicholson, C Monney, J M Riley, H Iwasawa, K Refson, V Sacksteder, D T Adroja, J Zhao, M Hoesch
We present angle-resolved photoemission spectroscopy measurements of the quasi-one-dimensional superconductor K_{2}Cr_{3}As_{3}. We find that the Fermi surface contains two Fermi surface sheets, with linearly dispersing bands not displaying any significant band renormalizations. The one-dimensional band dispersions display a suppression of spectral intensity approaching the Fermi level according to a linear power law, over an energy range of ∼200  meV. This is interpreted as a signature of Tomonoga-Luttinger liquid physics, which provides a new perspective on the possibly unconventional superconductivity in this family of compounds...
March 3, 2017: Physical Review Letters
https://www.readbyqxmd.com/read/28287140/multicolor-emission-from-intermediate-band-semiconductor-zno1-xsex
#16
M Welna, M Baranowski, W M Linhart, R Kudrawiec, K M Yu, M Mayer, W Walukiewicz
Photoluminescence and photomodulated reflectivity measurements of ZnOSe alloys are used to demonstrate a splitting of the valence band due to the band anticrossing interaction between localized Se states and the extended valence band states of the host ZnO matrix. A strong multiband emission associated with optical transitions from the conduction band to lower E- and upper E+ valence subbands has been observed at room temperature. The composition dependence of the optical transition energies is well explained by the electronic band structure calculated using the kp method combined with the band anticrossing model...
March 13, 2017: Scientific Reports
https://www.readbyqxmd.com/read/28254457/high-sensitivity-tms-fmri-of-the-human-motor-cortex-using-a-dedicated-multichannel-mr-coil
#17
Lucia I Navarro de Lara, Martin Tik, Michael Woletz, Roberta Frass-Kriegl, Ewald Moser, Elmar Laistler, Christian Windischberger
PURPOSE: To validate a novel setup for concurrent TMS/fMRI in the human motor cortex based on a dedicated, ultra-thin, multichannel receive MR coil positioned between scalp and TMS system providing greatly enhanced sensitivity compared to the standard birdcage coil setting. METHODS: A combined TMS/fMRI design was applied over the primary motor cortex based on 1Hz stimulation with stimulation levels of 80%, 90%, 100%, and 110% of the individual active motor threshold, respectively...
February 22, 2017: NeuroImage
https://www.readbyqxmd.com/read/28254338/controlled-co-release-of-doxorubicin-and-reactive-oxygen-species-for-synergistic-therapy-by-nir-remote-triggered-nanoimpellers
#18
Beibei Hou, Weitao Yang, Chunhong Dong, Bin Zheng, Ying Zhang, Jing Wu, Hanjie Wang, Jin Chang
How to encapsulate and transport the payload of multiple therapeutic compounds avoiding premature leakage, and simultaneously co-release them rapidly at specific lesions still remains the major concern in clinic. Herein, we designed the UCN@mSiO2-(Azo+RB) (azobenzene groups and Rose Bengal) nanoimpellers, which used the multicolor-emission capability of the core-shell upconverting nanoparticles (UCNs) at a single excitation wavelength to co-release anticarcinogen doxorubicin (Dox) and reactive oxygen species (ROS) for combined chemotherapy and photodynamic therapy (PDT)...
May 1, 2017: Materials Science & Engineering. C, Materials for Biological Applications
https://www.readbyqxmd.com/read/28253268/multiband-multi-echo-imaging-of-simultaneous-oxygenation-and-flow-timeseries-for-resting-state-connectivity
#19
Alexander D Cohen, Andrew S Nencka, R Marc Lebel, Yang Wang
A novel sequence has been introduced that combines multiband imaging with a multi-echo acquisition for simultaneous high spatial resolution pseudo-continuous arterial spin labeling (ASL) and blood-oxygenation-level dependent (BOLD) echo-planar imaging (MBME ASL/BOLD). Resting-state connectivity in healthy adult subjects was assessed using this sequence. Four echoes were acquired with a multiband acceleration of four, in order to increase spatial resolution, shorten repetition time, and reduce slice-timing effects on the ASL signal...
2017: PloS One
https://www.readbyqxmd.com/read/28242315/individual-differences-and-time-varying-features-of-modular-brain-architecture
#20
Xuhong Liao, Miao Cao, Mingrui Xia, Yong He
Recent studies have suggested that human brain functional networks are topologically organized into functionally specialized but inter-connected modules to facilitate efficient information processing and highly flexible cognitive function. However, these studies have mainly focused on group-level network modularity analyses using "static" functional connectivity approaches. How these extraordinary modular brain structures vary across individuals and spontaneously reconfigure over time remain largely unknown...
February 24, 2017: NeuroImage
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