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https://www.readbyqxmd.com/read/28549338/fast-backprojection-based-reconstruction-of-spectral-spatial-epr-images-from-projections-with-the-constant-sweep-of-a-magnetic-field
#1
Denis A Komarov, Hiroshi Hirata
In this paper, we introduce a procedure for the reconstruction of spectral-spatial EPR images using projections acquired with the constant sweep of a magnetic field. The application of a constant field-sweep and a predetermined data sampling rate simplifies the requirements for EPR imaging instrumentation and facilitates the backprojection-based reconstruction of spectral-spatial images. The proposed approach was applied to the reconstruction of a four-dimensional numerical phantom and to actual spectral-spatial EPR measurements...
May 17, 2017: Journal of Magnetic Resonance
https://www.readbyqxmd.com/read/28549314/application-of-novel-metal-organic-framework-mil-53-fe-and-its-magnetic-hybrid-for-removal-of-pharmaceutical-pollutant-doxycycline-from-aqueous-solutions
#2
Shakiba Naeimi, Hossein Faghihian
As a pharmaceutical pollutant, doxycycline causes contamination when enters into the environment. In this research MIL-53(Fe), and its magnetic hybrid MIL-53(Fe)/Fe3O4 were synthesized and employed for removal of doxycycline from aqueous solutions. The adsorbents were characterized by XRD, SEM, BET, FTIR, EDAX, VSM and TG-DTG technique. The effect of different variables such as DOC concentration, pH, contacting time, and adsorbent dose on the removal efficiency was studied and under optimized conditions the adsorption capacity of 322mgg(-1) was obtained...
May 11, 2017: Environmental Toxicology and Pharmacology
https://www.readbyqxmd.com/read/28548988/toward-precision-medicine-tailoring-interventional-strategies-based-on-noninvasive-brain-stimulation-for-motor-recovery-after-stroke
#3
Philipp J Koch, Friedhelm C Hummel
PURPOSE OF REVIEW: To support the recovery of disability and the reduced functional capacity influencing the independence of daily life after focal brain lesions like stroke, the application of noninvasive brain stimulation (NIBS) by repetitive transcranial magnetic stimulation or transcranial electric stimulation has been found useful in the last decades. Still, a positive influence on the recovery seems to be restricted to specific subgroups of patients. Therefore, a closer look on individual parameters influencing the recovery course and the effect of NIBS is needed...
May 25, 2017: Current Opinion in Neurology
https://www.readbyqxmd.com/read/28548605/changes-to-the-septo-fornical-area-might-play-a-role-in-the-pathogenesis-of-anxiety-in-multiple-sclerosis
#4
Miklos Palotai, Andrea Mike, Michele Cavallari, Erzsebet Strammer, Gergely Orsi, Brian C Healy, Katharina Schregel, Zsolt Illes, Charles Rg Guttmann
BACKGROUND: Reports on the relationships between white matter lesion load (WMLL) and fatigue and anxiety in multiple sclerosis (MS) are inconsistent. OBJECTIVE: To investigate the association of total and tract-specific WMLL with fatigue and anxiety. METHODS: Total and regional T2 WMLL was assessed for 19 tracts in 48 MS patients (30 females). ICBM-DTI-81 Atlas-based parcellation was combined with WMLL segmentation of T2-weighted magnetic resonance imaging (MRI)...
May 1, 2017: Multiple Sclerosis: Clinical and Laboratory Research
https://www.readbyqxmd.com/read/28548530/strain-induced-gauge-field-and-landau-levels-in-acoustic-structures
#5
Zhaoju Yang, Fei Gao, Yahui Yang, Baile Zhang
The emerging field of topological acoustics that explores novel gauge-field-related phenomena for sound has drawn attention in recent years. However, previous approaches constructing a synthetic gauge field for sound predominantly relied on a periodic system, being unable to form a uniform effective magnetic field, thus lacking access to some typical magnetic-induced quantum phenomena such as Landau energy quantization. Here we introduce strain engineering, previously developed in graphene electronics and later transferred to photonics, into a two-dimensional acoustic structure in order to form a uniform effective magnetic field for airborne acoustic wave propagation...
May 12, 2017: Physical Review Letters
https://www.readbyqxmd.com/read/28548529/resonances-in-the-field-angle-resolved-thermal-conductivity-of-cecoin_-5
#6
Duk Y Kim, Shi-Zeng Lin, Franziska Weickert, Eric D Bauer, Filip Ronning, J D Thompson, Roman Movshovich
The thermal conductivity measurement in a rotating magnetic field is a powerful probe of the structure of the superconducting energy gap. We present high-precision measurements of the low-temperature thermal conductivity in the unconventional heavy-fermion superconductor CeCoIn_{5}, with the heat current J along the nodal [110] direction of its d_{x^{2}-y^{2}} order parameter and the magnetic field up to 7 T rotating in the ab plane. In contrast to the smooth oscillations found previously for J∥[100], we observe a sharp resonancelike peak in the thermal conductivity when the magnetic field is also in the [110] direction, parallel to the heat current...
May 12, 2017: Physical Review Letters
https://www.readbyqxmd.com/read/28548521/double-quantum-spin-relaxation-limits-to-coherence-of-near-surface-nitrogen-vacancy-centers
#7
B A Myers, A Ariyaratne, A C Bleszynski Jayich
We probe the relaxation dynamics of the full three-level spin system of near-surface nitrogen-vacancy (NV) centers in diamond to define a T_{1} relaxation time that sets the T_{2}≤2T_{1} coherence limit of the NV's subset qubit superpositions. We find that double-quantum spin relaxation via electric field noise dominates T_{1} of near-surface NVs at low applied magnetic fields. Furthermore, we differentiate 1/f^{α} spectra of electric and magnetic field noise using a novel noise-spectroscopy technique, with broad applications in probing surface-induced decoherence at material interfaces...
May 12, 2017: Physical Review Letters
https://www.readbyqxmd.com/read/28548512/quantum-fluctuations-along-symmetry-crossover-in-a-kondo-correlated-quantum-dot
#8
Meydi Ferrier, Tomonori Arakawa, Tokuro Hata, Ryo Fujiwara, Raphaëlle Delagrange, Richard Deblock, Yoshimichi Teratani, Rui Sakano, Akira Oguri, Kensuke Kobayashi
Universal properties of entangled many-body states are controlled by their symmetry and quantum fluctuations. By the magnetic-field tuning of the spin-orbital degeneracy in a Kondo-correlated quantum dot, we have modified quantum fluctuations to directly measure their influence on the many-body properties along the crossover from SU(4) to SU(2) symmetry of the ground state. High-sensitive current noise measurements combined with the nonequilibrium Fermi liquid theory clarify that the Kondo resonance and electron correlations are enhanced as the fluctuations, measured by the Wilson ratio, increase along the symmetry crossover...
May 12, 2017: Physical Review Letters
https://www.readbyqxmd.com/read/28548504/theory-of-magnetic-ordering-in-the-heavy-rare-earths-ab%C3%A2-initio-electronic-origin-of-pair-and-four-spin-interactions
#9
Eduardo Mendive-Tapia, Julie B Staunton
We describe a disordered local moment theory for long-period magnetic phases and investigate the temperature and magnetic field dependence of the magnetic states in the heavy rare earth elements (HREs), namely, paramagnetic, conical and helical antiferromagnetic (HAFM), fan, and ferromagnetic (FM) states. We obtain a generic HRE magnetic phase diagram which is consequent on the response of the common HRE valence electronic structure to f-electron magnetic moment ordering. The theory directly links the first-order HAFM-FM transition to the loss of Fermi surface nesting, induced by this magnetic ordering, as well as provides a template for analyzing the other phases and exposing where f-electron correlation effects are particularly intricate...
May 12, 2017: Physical Review Letters
https://www.readbyqxmd.com/read/28547846/multiline-balanced-ssfp-for-rapid-functional-imaging-at-ultrahigh-field
#10
Philipp Ehses, Klaus Scheffler
PURPOSE: The goal of this study is to develop and evaluate a multiline balanced steady-state free-precession (bSSFP) sequence for passband functional MRI at ultrahigh field. METHODS: Passband bSSFP functional MRI experiments using a visual task were performed on a 9.4 T system with echo trains ranging from one up to seven echoes. We analyze the acquisition efficiency, temporal and thermal signal-to-noise ratio, as well as the observed blood oxygen-level-dependent (BOLD) signal changes...
May 25, 2017: Magnetic Resonance in Medicine: Official Journal of the Society of Magnetic Resonance in Medicine
https://www.readbyqxmd.com/read/28547820/future-of-medical-physics-real-time-mri-guided-proton-therapy
#11
Bradley M Oborn, Stephen Dowdell, Peter E Metcalfe, Stuart Crozier, Radhe Mohan, Paul J Keall
With the recent clinical implementation of real-time MRI guided x-ray beam therapy (MRXT), attention is therapy (MRPT). MRI guidance for proton beam therapy is expected to offer a compelling improvement to the turning to the concept of combining real-time MRI guidance with proton beam therapy; MRI guided proton beam current treatment workflow which is warranted arguably more than for x-ray beam therapy. This argument is born out of the fact that proton therapy toxicity outcomes are similar to that of the most advanced IMRT treatments, despite being a fundamentally superior particle for cancer treatment...
May 26, 2017: Medical Physics
https://www.readbyqxmd.com/read/28546762/cardiovascular-magnetic-resonance-imaging-clinical-implications-in-the-evaluation-of-connective-tissue-diseases
#12
REVIEW
Sophie Mavrogeni, George Markousis-Mavrogenis, Loukia Koutsogeorgopoulou, Genovefa Kolovou
Cardiovascular magnetic resonance imaging is a recently developed noninvasive, nonradiating, operator-independent technique that has been successfully used for the evaluation of congenital heart disease, valvular and pericardial diseases, iron overload, cardiomyopathies, great and coronary vessel diseases, cardiac inflammation, stress-rest myocardial perfusion, and fibrosis. Rheumatoid arthritis and other spondyloarthropathies, systemic lupus erythematosus, inflammatory myopathies, mixed connective tissue diseases (CTDs), systemic sclerosis, vasculitis, and sarcoidosis are among CTDs with serious cardiovascular involvement; this is due to multiple causative factors such as myopericarditis, micro/macrovascular disease, coronary artery disease, myocardial fibrosis, pulmonary hypertension, and finally heart failure...
2017: Journal of Inflammation Research
https://www.readbyqxmd.com/read/28546637/proximity-effect-induced-transport-properties-between-mbe-grown-bi1-xsbx-2se3-topological-insulators-and-magnetic-insulator-cofe2o4
#13
Shun-Yu Huang, Cheong-Wei Chong, Yi Tung, Tzu-Chin Chen, Ki-Chi Wu, Min-Kai Lee, Jung-Chun-Andrew Huang, Z Li, H Qiu
In this study, we investigate the proximity effect in topological insulator (TI) and magnetic insulator bilayer system. (Bi1-xSbx)2Se3/CoFe2O4 (CFO) heterostructure was fabricated using molecular beam epitaxy and pulsed laser deposition system respectively. As revealed from the magnetoresistance measurement, the weak anti-localization (WAL) is strongly suppressed by proximity effect in (Bi1-xSbx)2Se3/CFO interface. Modified Hikama-Larkin-Nagaoka equation was used to fit the WAL results so that the size of surface state gap can be extracted successfully...
May 25, 2017: Scientific Reports
https://www.readbyqxmd.com/read/28546211/an-on-off-berry-phase-switch-in-circular-graphene-resonators
#14
Fereshte Ghahari, Daniel Walkup, Christopher Gutiérrez, Joaquin F Rodriguez-Nieva, Yue Zhao, Jonathan Wyrick, Fabian D Natterer, William G Cullen, Kenji Watanabe, Takashi Taniguchi, Leonid S Levitov, Nikolai B Zhitenev, Joseph A Stroscio
The phase of a quantum state may not return to its original value after the system's parameters cycle around a closed path; instead, the wave function may acquire a measurable phase difference called the Berry phase. Berry phases typically have been accessed through interference experiments. Here, we demonstrate an unusual Berry phase-induced spectroscopic feature: a sudden and large increase in the energy of angular-momentum states in circular graphene p-n junction resonators when a relatively small critical magnetic field is reached...
May 26, 2017: Science
https://www.readbyqxmd.com/read/28546209/quantum-sensing-with-arbitrary-frequency-resolution
#15
J M Boss, K S Cujia, J Zopes, C L Degen
Quantum sensing takes advantage of well-controlled quantum systems for performing measurements with high sensitivity and precision. We have implemented a concept for quantum sensing with arbitrary frequency resolution, independent of the qubit probe and limited only by the stability of an external synchronization clock. Our concept makes use of quantum lock-in detection to continuously probe a signal of interest. Using the electronic spin of a single nitrogen-vacancy center in diamond, we demonstrate detection of oscillating magnetic fields with a frequency resolution of 70 microhertz over a megahertz bandwidth...
May 26, 2017: Science
https://www.readbyqxmd.com/read/28546208/submillihertz-magnetic-spectroscopy-performed-with-a-nanoscale-quantum-sensor
#16
Simon Schmitt, Tuvia Gefen, Felix M Stürner, Thomas Unden, Gerhard Wolff, Christoph Müller, Jochen Scheuer, Boris Naydenov, Matthew Markham, Sebastien Pezzagna, Jan Meijer, Ilai Schwarz, Martin Plenio, Alex Retzker, Liam P McGuinness, Fedor Jelezko
Precise timekeeping is critical to metrology, forming the basis by which standards of time, length, and fundamental constants are determined. Stable clocks are particularly valuable in spectroscopy because they define the ultimate frequency precision that can be reached. In quantum metrology, the qubit coherence time defines the clock stability, from which the spectral linewidth and frequency precision are determined. We demonstrate a quantum sensing protocol in which the spectral precision goes beyond the sensor coherence time and is limited by the stability of a classical clock...
May 26, 2017: Science
https://www.readbyqxmd.com/read/28546207/jupiter-s-magnetosphere-and-aurorae-observed-by-the-juno-spacecraft-during-its-first-polar-orbits
#17
J E P Connerney, A Adriani, F Allegrini, F Bagenal, S J Bolton, B Bonfond, S W H Cowley, J-C Gerard, G R Gladstone, D Grodent, G Hospodarsky, J L Jorgensen, W S Kurth, S M Levin, B Mauk, D J McComas, A Mura, C Paranicas, E J Smith, R M Thorne, P Valek, J Waite
The Juno spacecraft acquired direct observations of the jovian magnetosphere and auroral emissions from a vantage point above the poles. Juno's capture orbit spanned the jovian magnetosphere from bow shock to the planet, providing magnetic field, charged particle, and wave phenomena context for Juno's passage over the poles and traverse of Jupiter's hazardous inner radiation belts. Juno's energetic particle and plasma detectors measured electrons precipitating in the polar regions, exciting intense aurorae, observed simultaneously by the ultraviolet and infrared imaging spectrographs...
May 26, 2017: Science
https://www.readbyqxmd.com/read/28546206/jupiter-s-interior-and-deep-atmosphere-the-initial-pole-to-pole-passes-with-the-juno-spacecraft
#18
S J Bolton, A Adriani, V Adumitroaie, M Allison, J Anderson, S Atreya, J Bloxham, S Brown, J E P Connerney, E DeJong, W Folkner, D Gautier, D Grassi, S Gulkis, T Guillot, C Hansen, W B Hubbard, L Iess, A Ingersoll, M Janssen, J Jorgensen, Y Kaspi, S M Levin, C Li, J Lunine, Y Miguel, A Mura, G Orton, T Owen, M Ravine, E Smith, P Steffes, E Stone, D Stevenson, R Thorne, J Waite, D Durante, R W Ebert, T K Greathouse, V Hue, M Parisi, J R Szalay, R Wilson
On 27 August 2016, the Juno spacecraft acquired science observations of Jupiter, passing less than 5000 kilometers above the equatorial cloud tops. Images of Jupiter's poles show a chaotic scene, unlike Saturn's poles. Microwave sounding reveals weather features at pressures deeper than 100 bars, dominated by an ammonia-rich, narrow low-latitude plume resembling a deeper, wider version of Earth's Hadley cell. Near-infrared mapping reveals the relative humidity within prominent downwelling regions. Juno's measured gravity field differs substantially from the last available estimate and is one order of magnitude more precise...
May 26, 2017: Science
https://www.readbyqxmd.com/read/28545918/recent-trends-in-high-spin-sensitivity-magnetic-resonance
#19
Aharon Blank, Ygal Twig, Yakir Ishay
Magnetic resonance is a very powerful methodology that has been employed successfully in many applications for about 70years now, resulting in a wealth of scientific, technological, and diagnostic data. Despite its many advantages, one major drawback of magnetic resonance is its relatively poor sensitivity and, as a consequence, its bad spatial resolution when examining heterogeneous samples. Contemporary science and technology often make use of very small amounts of material and examine heterogeneity on a very small length scale, both of which are well beyond the current capabilities of conventional magnetic resonance...
February 28, 2017: Journal of Magnetic Resonance
https://www.readbyqxmd.com/read/28545298/design-and-fabrication-of-a-novel-stimulus-feedback-anticorrosion-coating-featured-by-rapid-self-healing-functionality-for-protection-of-magnesium-alloy
#20
ChenDi Ding, JianHua Xu, Ling Tong, GuangCai Gong, Wei Jiang, JiaJun Fu
Corrosion potential stimulus-responsive smart nanocontainers (CP-SNCs), are designed and synthesized based on the installation of the supramolecular assemblies (bipyridinium ⊂ water-soluble pillar[5]arenes) onto the exterior surface of magnetic nanovehicles (Fe3O4@mSiO2), linked by disulfide linkers. The supramolecular assemblies with high binding affinity as gatekeepers effectively block the encapsulated organic corrosion inhibitor, 8-hydroxyquinoline (8-HQ), within the mesopores of Fe3O4@mSiO2. When the corrosion potential of magnesium alloy (-1...
May 26, 2017: ACS Applied Materials & Interfaces
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