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https://www.readbyqxmd.com/read/29021734/calibrating-sans-data-for-instrument-geometry-and-pixel-sensitivity-effects-access-to-an-extended-q-range
#1
Lukas Karge, Ralph Gilles, Sebastian Busch
An improved data-reduction procedure is proposed and demonstrated for small-angle neutron scattering (SANS) measurements. Its main feature is the correction of geometry- and wavelength-dependent intensity variations on the detector in a separate step from the different pixel sensitivities: the geometric and wavelength effects can be corrected analytically, while pixel sensitivities have to be calibrated to a reference measurement. The geometric effects are treated for position-sensitive (3)He proportional counter tubes, where they are anisotropic owing to the cylindrical geometry of the gas tubes...
October 1, 2017: Journal of Applied Crystallography
https://www.readbyqxmd.com/read/28971193/atomistic-observation-of-the-collision-and-migration-of-li-on-mose2-and-ws2-surfaces-through-ab-initio-molecular-dynamics
#2
Thi H Ho, Viet Q Bui, Thang Bach Phan, Yoshiyuki Kawazoe, Hung M Le
We present in this study a theoretical investigation of the collision of Li with the MX2 surface (MoSe2 or WS2) by employing the Born-Oppenheimer molecular dynamics (MD) approach. In each trajectory, atomic Li is fired toward the two-dimensional monolayer with an inletting kinetic energy of 0.2 eV or 2.0 eV and a chosen striking angle. In total, 84 MD trajectories are analyzed. We observe that Li has a high tendency to migrate on WS2 in most investigated cases (20/21 cases at 0.2 eV inletting kinetic energy and 21/21 cases at 2...
October 3, 2017: Physical Chemistry Chemical Physics: PCCP
https://www.readbyqxmd.com/read/28964238/3d-ion-velocity-distribution-function-measurement-in-an-electric-thruster-using-laser-induced-fluorescence-tomography
#3
P Q Elias, J Jarrige, E Cucchetti, F Cannat, D Packan
Measuring the full ion velocity distribution function (IVDF) by non-intrusive techniques can improve our understanding of the ionization processes and beam dynamics at work in electric thrusters. In this paper, a Laser-Induced Fluorescence (LIF) tomographic reconstruction technique is applied to the measurement of the IVDF in the plume of a miniature Hall effect thruster. A setup is developed to move the laser axis along two rotation axes around the measurement volume. The fluorescence spectra taken from different viewing angles are combined using a tomographic reconstruction algorithm to build the complete 3D (in phase space) time-averaged distribution function...
September 2017: Review of Scientific Instruments
https://www.readbyqxmd.com/read/28957261/pulse-width-adjustable-q-switched-cavity-dumped-laser-by-rotating-a-quarter-wave-plate-and-a-pockels-cell
#4
Ke Liu, Li-Jiao He, Yong Bo, Xiao-Jun Wang, Yu Shen, Zhao Liu, Lei Yuan, Qin-Jun Peng, Da-Fu Cui, Zu-Yan Xu
A pulse width adjustable 1064 nm Q-switched cavity dumped Nd:YVO4 laser was realized for the first time, to the best of our knowledge, by rotating an intracavity quarter-wave plate (QWP) and a Pockels cell (PC). The pulse width adjustment range was 4.8-7.8 ns with a constant output power of 3.6 W, and it reached 4.8-13.5 ns for a lower output power of 1.3 W. The pulse width was dependent mostly on the rotating angle of the QWP and PC, but independent of the gain and pulse repetition rate.
July 1, 2017: Optics Letters
https://www.readbyqxmd.com/read/28952937/single-and-multiple-shell-uniform-sampling-schemes-for-diffusion-mri-using-spherical-codes
#5
Jian Cheng, Dinggang Shen, Pew-Thian Yap, Peter J Basser
In diffusion MRI (dMRI), a good sampling scheme is important for efficient acquisition and robust reconstruction. Diffusion weighted signal is normally acquired on single or multiple shells in q-space. Signal samples are typically distributed uniformly on different shells to make them invariant to the orientation of structures within tissue, or the laboratory coordinate frame. The Electrostatic Energy Minimization (EEM) method, originally proposed for single shell sampling scheme in dMRI, was recently generalized to multi-shell schemes, called Generalized EEM (GEEM)...
September 25, 2017: IEEE Transactions on Medical Imaging
https://www.readbyqxmd.com/read/28935949/tunable-polarization-conversion-and-rotation-based-on-a-reconfigurable-metasurface
#6
M Zhang, W Zhang, A Q Liu, F C Li, C F Lan
Polarization is an important property of electromagnetic (EM) wave and different polarization manipulations are required for varied optical applications. Here we report a reconfigurable metasurface which achieves both the polarization conversion and the polarization rotation in THz regime. The metasurface is reconfigured through the micro-electro-mechanical-systems (MEMS) actuation. The cross polarization transmittance from a linear polarized incidence is experimentally tuned from 0 to 28% at 2.66 THz. In addition, the polarization rotation angle is effectively changed from -12...
September 21, 2017: Scientific Reports
https://www.readbyqxmd.com/read/28922031/optic-nerve-head-characteristics-in-chronic-angle-closure-glaucoma-detected-by-swept-source-oct
#7
Dejiao Li, Taibo Li, Eleftherios I Paschalis, Haobing Wang, Elise V Taniguchi, Zi-Ning Choo, Marissa K Shoji, Scott H Greenstein, Stacey C Brauner, Angela V Turalba, Louis R Pasquale, Lucy Q Shen
PURPOSE: To compare structural features in prelaminar and laminar tissues of the optic nerve head (ONH) in chronic angle closure glaucoma (CACG), primary open angle glaucoma (POAG), and control subjects. MATERIALS AND METHODS: ONH imaging was performed using swept-source optical coherence tomography (SS-OCT) for measurements of minimum rim width at Bruch's membrane opening (BMO-MRW), horizontal, and vertical lamina cribrosa depth (LCD). Prelaminar defects, categorized as hole and wedge, and lamina cribrosa (LC) defects were identified...
November 2017: Current Eye Research
https://www.readbyqxmd.com/read/28921913/high-resolution-imaging-of-muscle-attachment-structures-in-c-elegans
#8
Hiroshi Qadota, Yohei Matsunaga, Ken C Q Nguyen, Alexa Mattheyses, David H Hall, Guy M Benian
We used structured illumination microscopy (SIM) to obtain super-resolution images of muscle attachment structures in C. elegans striated muscle. SIM imaging of M-line components revealed two patterns: PAT-3 (β-integrin) and proteins that interact in a complex with the cytoplasmic tail of β-integrin and localize to the basal muscle cell membrane (UNC-112 (kindlin), PAT-4 (ILK), UNC-97 (PINCH), PAT-6 (α-parvin) and UNC-95), are found in discrete, angled segments with gaps. In contrast, proteins localized throughout the depth of the M-line (UNC-89 (obscurin) and UNC-98) are imaged as continuous lines...
September 16, 2017: Cytoskeleton
https://www.readbyqxmd.com/read/28915485/long-acting-and-broad-spectrum-antimicrobial-electrospun-poly-%C3%AE%C2%B5-caprolactone-gelatin-micro-nanofibers-for-wound-dressing
#9
Rui Shi, Huan Geng, Min Gong, Jingjing Ye, Chengai Wu, Xiaohua Hu, Liqun Zhang
Trimethoxysilylpropyl octadecyldimethyl ammonium chloride (QAS), which forms facile bonds with hydroxyl groups, acts asa cationic antibacterial agent. In this work, QAS was introduced into a polycaprolactone (PCL)/gelatin hybrid in increasing concentrations to fabricate a long-acting and broad-spectrum antimicrobial micro/nanofiber membrane as a novel wound dressing. The physical interactions and chemical bonding between QAS/PCL and QAS/gelatin were demonstrated by infrared spectroscopy (FTIR) and X-ray photoelectron spectroscopy (XPS...
September 1, 2017: Journal of Colloid and Interface Science
https://www.readbyqxmd.com/read/28874696/metamaterial-perfect-absorber-analyzed-by-a-meta-cavity-model-consisting-of-multilayer-metasurfaces
#10
Khagendra Bhattarai, Sinhara Silva, Kun Song, Augustine Urbas, Sang Jun Lee, Zahyun Ku, Jiangfeng Zhou
We demonstrate that the metamaterial perfect absorber behaves as a meta-cavity bounded between a resonant metasurface and a metallic thin-film reflector. The perfect absorption is achieved by the Fabry-Perot cavity resonance via multiple reflections between the "quasi-open" boundary of resonator and the "close" boundary of reflector. The characteristic features including angle independence, ultra-thin thickness and strong field localization can be well explained by this meta-cavity model. With this model, metamaterial perfect absorber can be redefined as a meta-cavity exhibiting high Q-factor, strong field enhancement and extremely high photonic density of states, thereby promising novel applications for high performance sensor, infrared photodetector and cavity quantum electrodynamics devices...
September 5, 2017: Scientific Reports
https://www.readbyqxmd.com/read/28863710/radio-frequency-source-of-a-weakly-expanding-wedge-shaped-xenon-ion-beam-for-contactless-removal-of-large-sized-space-debris-objects
#11
Victor Balashov, Maria Cherkasova, Kirill Kruglov, Arseny Kudriavtsev, Pavel Masherov, Andrey Mogulkin, Vladimir Obukhov, Valentin Riaby, Victoria Svotina
A theoretical-experimental research has been carried out to determine the characteristics of a radio frequency (RF) ion source for the generation of a weakly expanding wedge-shaped xenon ion beam. Such ion beam geometry is of interest as a prototype of an on-board ion injector for contactless "ion shepherding" by service spacecraft to remove large space debris objects from geostationary orbits. The wedge shape of the ion beam increases its range. The device described herein comprises an inductive gas discharge chamber and a slit-type three-electrode ion extraction grid (IEG) unit...
August 2017: Review of Scientific Instruments
https://www.readbyqxmd.com/read/28863624/development-of-beam-emission-spectroscopy-diagnostic-on-east
#12
H J Wang, Y Yu, R Chen, Y F Wu, B D Yuan, S B Gong, Q J Yu, B Lyu, Y J Shi, M Y Ye, B N Wan
Beam Emission Spectroscopy (BES) diagnostic based on Neutron Beam Injection (NBI) on the Experimental Advanced Superconducting Tokamak has been developed. This system consists of 16 × 8 channels which can diagnose the density fluctuation in a rectangular area of about 20 × 10 cm(2) in the cross section, whose radial position is adjustable from the core to edge just by means of changing the angle of the rotation mirror. The spatial resolution is about 1-3 cm according to the diagnosed radial position. The temporal resolution is 1 μs...
August 2017: Review of Scientific Instruments
https://www.readbyqxmd.com/read/28856049/toward-whole-body-quantitative-photoacoustic-tomography-of-small-animals-with-multi-angle-light-sheet-illuminations
#13
Yihan Wang, Jie He, Jiao Li, Tong Lu, Yong Li, Wenjuan Ma, Limin Zhang, Zhongxing Zhou, Huijuan Zhao, Feng Gao
Several attempts to achieve the quantitative photoacoustic tomography (q-PAT) have been investigated using point sources or a single-angle wide-field illumination. However, these schemes normally suffer from low signal-to-noise ratio (SNR) or poor quantification in imaging applications on large-size domains, due to the limitation of ANSI-safety incidence and incompleteness in the data acquisition. We herein present a q-PAT implementation that uses multi-angle light-sheet illuminations and calibrated recovering-and-averaging iterations...
August 1, 2017: Biomedical Optics Express
https://www.readbyqxmd.com/read/28835964/a-high-resolution-natural-abundance-33-s-mas-nmr-study-of-the-cementitious-mineral-ettringite
#14
Akiko Sasaki, Luis Baquerizo Ibarra, Stephen Wimperis
Despite the widespread occurrence of sulfur in both natural and man-made materials, the (33)S nucleus has only rarely been utilised in solid-state NMR spectroscopy on account of its very low natural abundance (0.76%), low NMR frequency (ν0 = 30.7 MHz at B0 = 9.4 T), and significant nuclear quadrupole moment (spin I = 3/2, Q = -69.4 mb). Satellite-transition magic angle spinning (STMAS) is an NMR method for obtaining high-resolution spectra of half-integer quadrupolar nuclei (spin I > 1/2) in solids and is notable for its intrinsic sensitivity advantage over the similar multiple-quantum (MQMAS) method, especially for nuclei with low NMR frequencies...
September 13, 2017: Physical Chemistry Chemical Physics: PCCP
https://www.readbyqxmd.com/read/28806771/effect-of-knee-alignment-on-the-quadriceps-femoris-muscularity-cross-sectional-comparison-of-trained-versus-untrained-individuals-in-both-sexes
#15
COMPARATIVE STUDY
Ryoichi Ema, Taku Wakahara, Kuniaki Hirayama, Yasuo Kawakami
Knee alignment is suggested to be a factor affecting each quadriceps femoris muscle size, and knee alignment such as Q-angle differs between men and women. Also, training can induce inhomogeneous hypertrophy among the quadriceps femoris, thereby leading to different component characteristics of the muscles. If Q-angle is a major determinant of the quadriceps femoris muscularity, it is hypothesized that the sex-related difference in the quadriceps femoris muscularity, if any, is further highlighted in trained individuals, being associated with Q-angle...
2017: PloS One
https://www.readbyqxmd.com/read/28805385/synthesis-of-a-series-of-heavy-lanthanide-iii-monoporphyrinato-complexes-with-tetragonal-symmetry
#16
Anas Santria, Akira Fuyuhiro, Takamitsu Fukuda, Naoto Ishikawa
A series of heavy lanthanide(III) and yttrium(III) monoporphyrinato complexes formulated in [Ln(TPP)(cyclen)]Cl (Ln = Tb, Dy, Ho, Er, Tm, Yb, and Y; TPP = 5,10,15,20-tetraphenylporphyrinato), with cyclen, 1,4,7,10-tetraazacyclododecane, as a capping ligand, have been prepared in mild conditions and studied using single-crystal X-ray diffraction crystallography. The complexes exhibit an electronic absorption band (B(0,0)) in the range of 421-423 nm, showing a bathochromic shift associated with the increase of the ionic radii of the lanthanide, as well as two peaks of Q(1,0) and Q(0,0) bands between 548-586 nm...
August 14, 2017: Inorganic Chemistry
https://www.readbyqxmd.com/read/28800298/impact-of-field-number-and-beam-angle-on-functional-image-guided-lung-cancer-radiotherapy-planning
#17
Bilal A Tahir, Chris M Bragg, Jim M Wild, James A Swinscoe, Sarah E Lawless, Kerry A Hart, Matthew Q Hatton, Rob H Ireland
To investigate the effect of beam angles and field number on functionally-guided intensity modulated radiotherapy (IMRT) normal lung avoidance treatment plans that incorporate hyperpolarised helium-3 magnetic resonance imaging ((3)He MRI) ventilation data. Eight non-small cell lung cancer patients had pre-treatment (3)He MRI that was registered to inspiration breath-hold radiotherapy planning computed tomography. IMRT plans that minimised the volume of total lung receiving  ⩾20 Gy (V20) were compared with plans that minimised (3)He MRI defined functional lung receiving  ⩾20 Gy (fV20)...
August 11, 2017: Physics in Medicine and Biology
https://www.readbyqxmd.com/read/28764527/an-eight-channel-doppler-backscattering-system-in-the-experimental-advanced-superconducting-tokamak
#18
J Q Hu, C Zhou, A D Liu, M Y Wang, E J Doyle, W A Peebles, G Wang, X H Zhang, J Zhang, X Feng, J X Ji, H Li, T Lan, J L Xie, W X Ding, W D Liu, C X Yu
Doppler backscattering system can measure the perpendicular velocity and fluctuation amplitude of the density turbulence with intermediate wavenumber. An eight-channel Doppler backscattering system has been installed in the Experimental Advanced Superconducting Tokamak (EAST), which can probe eight different radial locations simultaneously by launching eight fixed frequencies (55, 57.5, 60, 62.5, 67.5, 70, 72.5, 75 GHz) into plasma. The quasi-optical system consists of circular corrugated waveguide transmission, a fixed parabolic mirror, and a rotatable parabolic mirror which are integrated with quasi-optics front-end of the profile reflectometer inside the vacuum vessel...
July 2017: Review of Scientific Instruments
https://www.readbyqxmd.com/read/28759830/forearm-nonunion-caused-by-hyperparathyroidism-with-7-years-follow-up-a-case-report
#19
Mayuko Kinoshita, Kiyohito Naito, Kentaro Aritomi, Yoichi Sugiyama, Nana Nagura, Kenji Goto, Yoshiyuki Iwase, Kazuo Kaneko
INTRODUCTION: We report a patient who developed nonunion of both bones of the forearm associated with hyperparathyroidism (HPT). PRESENTATION OF CASE: The patient was a 71-year-old female who previously fell and hit her left hand on the ground. At 2 years after injury the patient visited our hospital, since she became aware of instability of the left forearm without an inducer due to nonunion of the radioulnar diaphysis. The patient was surgically treated to acquire forearm support...
2017: International Journal of Surgery Case Reports
https://www.readbyqxmd.com/read/28753336/beam-recoil-polarization-measurement-of-%C3%AF-0-electroproduction-on-the-proton-in-the-region-of-the-roper-resonance
#20
S Štajner, P Achenbach, T Beranek, J Beričič, J C Bernauer, D Bosnar, R Böhm, L Correa, A Denig, M O Distler, A Esser, H Fonvieille, J M Friedrich, I Friščić, S Kegel, Y Kohl, H Merkel, M Mihovilovič, J Müller, U Müller, L Nungesser, J Pochodzalla, B S Schlimme, M Schoth, F Schulz, C Sfienti, S Širca, M Thiel, L Tiator, A Tyukin, A Weber, I Yaron
The helicity-dependent recoil proton polarizations P_{x}^{'} and P_{z}^{'} as well as the helicity-independent component P_{y} have been measured in the p(e[over →],e^{'}p[over →])π^{0} reaction at four-momentum transfer Q^{2}≃0.1  GeV^{2}, center-of-mass proton emission angle θ_{p}^{*}≃90°, and invariant mass W≃1440  MeV. This first precise measurement of double-polarization observables in the energy domain of the Roper resonance P_{11}(1440) by exploiting recoil polarimetry has allowed for the extraction of its scalar electroexcitation amplitude at an unprecedentedly low value of Q^{2}, establishing a powerful instrument for probing the interplay of quark and meson degrees of freedom in the nucleon...
July 14, 2017: Physical Review Letters
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