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# Magnetic field

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#1
Aaron M Coffey, Matthew A Feldman, Roman V Shchepin, Danila A Barskiy, Milton L Truong, Wellington Pham, Eduard Y Chekmenev
High-resolution (13)C NMR spectroscopy of hyperpolarized succinate-1-(13)C-2,3-d2 is reported in vitro and in vivo using a clinical-scale, biplanar (80cm-gap) 48.7mT permanent magnet with a high homogeneity magnetic field. Non-localized (13)C NMR spectra were recorded at 0.52MHz resonance frequency over the torso of a tumor-bearing mouse every 2s. Hyperpolarized (13)C NMR signals with linewidths of ∼3Hz (corresponding to ∼6ppm) were recorded in vitro (2mL in a syringe) and in vivo (over a mouse torso). Comparison of the full width at half maximum (FWHM) for (13)C NMR spectra acquired at 48...
June 15, 2017: Journal of Magnetic Resonance
#2
Claudia Stauch, Stephan Späth, Thomas Ballweg, Robert Luxenhofer, Karl Mandel
Surface modified superparamagnetic iron oxide nanoparticles are assembled into nanostructured micro-raspberry particles via spray drying. The micro-raspberry powder is readily redispersed to individual nanoparticles or nanostructured sub-units, depending on the initially adjusted nanoparticle modification. In this work, it is demonstrated how the technique of magnetic zero-field-cooled/field-cooled (ZFC/FC) measurements can be used to judge the degree of agglomeration, i.e. the extent of hard-agglomerates and soft-agglomerates in a system and predict the redispersibility of the powder particles...
June 16, 2017: Journal of Colloid and Interface Science
#3
Martin Linck, Peter A Ercius, Jordan S Pierce, Benjamin J McMorran
In the past 15 years, the advent of aberration correction technology in electron microscopy has enabled materials analysis on the atomic scale. This is made possible by precise arrangements of multipole electrodes and magnetic solenoids to compensate the aberrations inherent to any focusing element of an electron microscope. Here, we describe an alternative method to correct for the spherical aberration of the objective lens in scanning transmission electron microscopy (STEM) using a passive, nanofabricated diffractive optical element...
June 12, 2017: Ultramicroscopy
#4
Laura Gemme, Sonia Nardotto, Silvana G Dellepiane
In the context of rheumatic diseases, several studies suggest that Magnetic Resonance Imaging (MRI) allows the detection of the three main signs of Rheumatoid Arthritis (RA) at higher sensitivities than available through conventional radiology. The rapid, accurate segmentation of bones is an essential preliminary step for quantitative diagnosis, erosion evaluation, and multi-temporal data fusion. In the present paper, a new, semi-automatic, 3D graph-based segmentation method to extract carpal bone data is proposed...
June 12, 2017: Computers in Biology and Medicine
#5
Beltzane Garcia-Cirera, Silvia Gómez-Coca, Mercè Font-Bardia, Eliseo Ruiz, Montserrat Corbella
The two new Mn(III) dinuclear compounds [{Mn(H2O)(phen)}2(μ-4-CH3C6H4COO)2(μ-O)](ClO4)2·3CH3CN·H2O (1·3CH3CN·H2O) and [{Mn(H2O)(phen)}(μ-O)(μ-2-BrC6H4COO)2{Mn(NO3)(phen)}]NO3 (2) have been synthesized. Their structural data reveal significant differences in the shape of the coordination octahedron around the Mn(III) ions in both compounds. The different distortions from ideal geometry incite a very different magnetic behavior, affecting both the zero-field splitting parameters of the Mn(III) ions (DMn and EMn) and the magnetic interaction between them...
June 26, 2017: Inorganic Chemistry
#6
Xiao-Xiao Zhang, Ting Cao, Zhengguang Lu, Yu-Chuan Lin, Fan Zhang, Ying Wang, Zhiqiang Li, James C Hone, Joshua A Robinson, Dmitry Smirnov, Steven G Louie, Tony F Heinz
Monolayer transition metal dichalcogenide crystals, as direct-gap materials with strong light-matter interactions, have attracted much recent attention. Because of their spin-polarized valence bands and a predicted spin splitting at the conduction band edges, the lowest-lying excitons in WX2 (X = S, Se) are expected to be spin-forbidden and optically dark. To date, however, there has been no direct experimental probe of these dark excitons. Here, we show how an in-plane magnetic field can brighten the dark excitons in monolayer WSe2 and permit their properties to be observed experimentally...
June 26, 2017: Nature Nanotechnology
#7
Harikrishnan Sasidharan Nair, Michael O Ogunbunmi, Naveen Kumar Chogondalli Muniraju, D T Adroja, Pascal Manuel, Dominic Fortes, James Taylor, Andre M Strydom
The intermetallic compound \PFA\ that possesses a three-dimensional network structure of Al polyhedra centered at the transition metal element Fe and the rare earth Pr is investigated through neutron powder diffraction and inelastic neutron scattering in order to elucidate the magnetic ground state of Pr and Fe and the crystal field effects of Pr. Our neutron diffraction study confirms long-range magnetic order of Pr below $T_N$ = 4.5~K in this compound. Subsequent magnetic structure estimation reveals a magnetic propagation vector $\bf k$ = {\bf ($\frac{1}{2}$~0~$\frac{1}{2}$)} with a magnetic moment value of 2...
June 26, 2017: Journal of Physics. Condensed Matter: An Institute of Physics Journal
#8
Dong Li, Dongxing Zheng, Junlu Gong, Wanchao Zheng, Chao Jin, Haili Bai
Highly strained epitaxial BiFeO3/La0.67Sr0.33MnO3-δ heterostructures were fabricated on LaAlO3 substrates by magnetron sputtering. The as-grown downward self-polarization of BiFeO3 (BFO) capping layers was confirmed by piezoelectric force microscope. Through the electrostatic field induced charge screening, a hole depletion state was induced in ultrathin (8 nm) La0.67Sr0.33MnO3-δ (LSMO) films. As a result of the interfacial charge coupling, appreciable saturated magnetization (MS) increase of about 500% and 100% can be observed in LSMO with BFO capping at 5 K and 300 K, respectively...
June 26, 2017: ACS Applied Materials & Interfaces
#9
Wen-Chao Chen, Yuan Zhou, Shun-Li Yu, Wei-Guo Yin, Chang-De Gong
Quantum confinement and interference often generate exotic properties in nanostructures. One recent highlight is the experimental indication of a magnetic phase transition in zigzag-edged graphene nanoribbons at the critical ribbon width of about 7 nm [G. Z. Magda et al., Nature \textbf{514}, 608 (2014)]. Here we show theoretically that with further increase in the ribbon width, the magnetic correlation of the two edges can exhibit an intriguing oscillatory behavior between antiferromagnetic and ferromagnetic, driven by acquiring the positive coherence between the two edges to lower the free energy...
June 24, 2017: Nano Letters
#10
REVIEW
Hamid Emadi, Masoud Salavati-Niasari, Azam Sobhani
The design of nanostructures with favored shape, particle size and structure is one of the most important fields of nanoscience. To reach this target hydrothermal method is one of the most applicable methods which allow us to obtain favored structures by changing some parameters. This review focuses on synthesis of some transition metal sulfides by hydrothermal method because of technological importance of this group of material. The common sulfides of Mn, Co, Ni, Cu, Zn, Ag and Cd are introduced and a mechanism proposed for their synthesis...
June 16, 2017: Advances in Colloid and Interface Science
#11
Catherine Fassbender, Prerona Mukherjee, Julie B Schweitzer
Functional Magnetic Resonance Imaging (fMRI) represents a powerful tool with which to examine brain functioning and development in typically developing pediatric groups as well as children and adolescents with clinical disorders. However, fMRI data can be highly susceptible to misinterpretation due to the effects of excessive levels of noise, often related to head motion. Imaging children, especially with developmental disorders, requires extra considerations related to hyperactivity, anxiety and the ability to perform and maintain attention to the fMRI paradigm...
July 1, 2017: NeuroImage
#12
Kim Maren Lompe, David Menard, Benoit Barbeau
Combining powdered activated carbon (PAC) with magnetic iron oxides has been proposed in the past to produce adsorbents for natural organic matter (NOM) removal that can be easily separated using a magnetic field. However, the trade-off between the iron oxides' benefits and the reduced carbon content, porosity, and surface area has not yet been investigated systematically. We produced 3 magnetic powdered activated carbons (MPAC) with mass fractions of 10%, 38% and 54% maghemite nanoparticles and compared them to bare PAC and pure nanoparticles with respect to NOM adsorption kinetics and isotherms...
June 17, 2017: Water Research
#13
Hiroshi Shirozu, Akira Hashizume, Hiroshi Masuda, Yosuke Ito, Yoko Nakayama, Takefumi Higashijima, Masafumi Fukuda, Shigeki Kameyama
OBJECTIVE: We aimed to validate the usefulness of gradient magnetic-field topography (GMFT) for analysis of ictal magnetoencephalography (MEG) in patients with neocortical epilepsy. METHODS: We identified 13 patients presenting with an ictal event during preoperative MEG. We applied equivalent current dipole (ECD) estimation and GMFT to detect and localize the ictal MEG onset, and compared these methods with the ictal onset zone (IOZ) derived from chronic intracranial electroencephalography...
June 7, 2017: Clinical Neurophysiology: Official Journal of the International Federation of Clinical Neurophysiology
#14
Mark S Conradi, Stephen A Altobelli, Nicholas J Sowko, Susan H Conradi, Eiichi Fukushima
The sensitivity of earth's field NMR is greatly increased by the use of a pre-polarizing field Bp. When used with short T1 samples, the field must be decreased rapidly to avoid loss of the pre-polarized magnetization by relaxation. Such a rapid decrease in the field requires rapid discharge (∼10ms) of a large stored magnetic field energy (∼700J). In addition, in order that the full pre-polarized magnetization be available for the subsequent pulse sequence, the field discharge should be adiabatic. This requirement is difficult to fulfill in cases where Bp is not everywhere parallel to the earth's field, such as with a large surface coil...
June 21, 2017: Journal of Magnetic Resonance
#15
Kirill F Sheberstov, Dmitry O Sinitsyn, Dmitry A Cheshkov, Damien Jeannerat
An efficient approach for reference deconvolution of two-dimensional spectra aiming at the correction of static field inhomogeneity was established. In comparison to known techniques, a great improvement was achieved using the cross-section along the diagonal of the reference peak instead of its full 2D line shape. The method is termed pseudo-2D diagonal deconvolution. The approach developed allows suppressing the two-dimensional peaks tilting caused by the magnetic field inhomogeneity, while keeping the signal-to-noise ratio constant...
June 8, 2017: Journal of Magnetic Resonance
#16
Cyril J Ferrer, Lambertus W Bartels, Marijn van Stralen, Baudouin Denis de Senneville, Chrit T W Moonen, Clemens Bos
PURPOSE: To demonstrate that fluid filling of the digestive tract improves the performance of respiratory motion-compensated proton resonance frequency shift (PRFS)-based magnetic resonance (MR) thermometry in the pancreas. MATERIALS AND METHODS: In seven volunteers (without heating), we evaluated PRFS thermometry in the pancreas with and without filling of the surrounding digestive tract. All data acquisition was performed at 1.5T, then all datasets were analyzed and compared with three different PRFS respiratory motion-compensated thermometry methods: gating, multibaseline, and referenceless...
June 24, 2017: Journal of Magnetic Resonance Imaging: JMRI
#17
Ciro Nappi, Carlo Camerlingo, Emanuele Enrico, Emilio Bellingeri, Valeria Braccini, Carlo Ferdeghini, Ettore Sarnelli
We study the current-voltage characteristics of Fe(Se,Te) thin films deposited on CaF2 substrates in form of nanostrips (width w ~ λ, λ the London penetration length). In view of a possible application of these materials to superconductive electronics and micro-electronics we focus on transport properties in small magnetic field, the one generated by the bias current. From the characteristics taken at different temperatures we derive estimates for the pinning potential U and the pinning potential range δ for the magnetic flux lines (vortices)...
June 23, 2017: Scientific Reports
#18
Soma Banik, Pranab Kumar Das, Azzedine Bendounan, Ivana Vobornik, A Arya, Nathan Beaulieu, Jun Fujii, A Thamizhavel, P U Sastry, A K Sinha, D M Phase, S K Deb
Rashba spin-orbit splitting in the magnetic materials opens up a new perspective in the field of spintronics. Here, we report a giant Rashba spin-orbit splitting on the PrGe [010] surface in the paramagnetic phase with Rashba coefficient α R  = 5 eVÅ. We find that α R can be tuned in this system as a function of temperature at different magnetic phases. Rashba type spin polarized surface states originates due to the strong hybridization between Pr 4f states with the conduction electrons. Significant changes observed in the spin polarized surface states across the magnetic transitions are due to the competition between Dzyaloshinsky-Moriya interaction and exchange interaction present in this system...
June 23, 2017: Scientific Reports
#19
Yury Koush, John Ashburner, Evgeny Prilepin, Ronald Sladky, Peter Zeidman, Sergei Bibikov, Frank Scharnowski, Artem Nikonorov, Dimitri Van De Ville
Neurofeedback based on real-time functional magnetic resonance imaging (rt-fMRI) is a novel and rapidly developing research field. It allows for training of voluntary control over localized brain activity and connectivity and has demonstrated promising clinical applications. Because of the rapid technical developments of MRI techniques and the availability of high-performance computing, new methodological advances in rt-fMRI neurofeedback become possible. Here we outline the core components of a novel open-source neurofeedback framework, termed Open NeuroFeedback Training (OpenNFT), which efficiently integrates these new developments...
June 20, 2017: NeuroImage
#20
Lijun Wang, Ronghui Wang, Hong Wang, Michael Slavik, Hua Wei, Yanbin Li
Aptamers are single-stranded oligonucleotide ligands that can bind to targets with high affinity and specificity. They have been widely studied in the field of diagnostics as alternatives to antibodies due to their favorable features such as easy labeling, temperature tolerance, lower cost and recognition of a wide variety of targets. In this study, an aptamer-based PCR method coupled with magnetic immunoseparation was developed to detect S. Typhimurium from ground turkey. Firstly, biotinylated polyclonal anti-S...
June 20, 2017: Analytical Biochemistry
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