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q angle

Matthias Justen, Christopher Bonzon, Keita Ohtani, Mathias Beck, Urs Graf, Jerome Faist
2×2 parallel fed and 3×3 serial fed patch antenna arrays on a benzocyclobutene (BCB) polymer layer are integrated with a 70 μm wide, dry etched, double metal waveguide quantum cascade laser, operating at about 1.9 THz. The BCB surrounds the quantum cascade laser ridge and is planarized to fit precisely its height. The patch antenna arrays emit a linearly polarized, highly symmetric beam perpendicular to the antenna plane. The beams have a FWHM angle of 49° (2×2) and 35° (3×3). Both measurements and simulations indicate coupling factors to a Gaussian beam of over 90%...
October 1, 2016: Optics Letters
Shu-Xin Zhang, Li Wang, Ze-Yang Li, Yan Li, Qihuang Gong, Yun-Feng Xiao
The free-space coupling technique provides a promising means to excite high-Q whispering gallery modes in deformed microcavities, but the precise quantification of the coupling efficiency remains challenging because of the non-Lorentzian spectral lineshape in the transmission and the partial collection in emission. Here, we experimentally identify the free-space coupling efficiency by measuring the threshold of stimulated Raman scattering in a slightly deformed microcavity. The measured efficiency is up to 30%...
October 1, 2016: Optics Letters
Athanasios Ch Mitropoulos, Evangelos P Favvas, Konstantinos L Stefanopoulos, Etienne F Vansant
Everett's theorem-6 of the domain theory was examined by conducting adsorption in situ with small angle x-ray scattering (SAXS) supplemented by the contrast matching technique. The study focuses on the spectrum differences of a point to which the system arrives from different scanning paths. It is noted that according to this theorem at a common point the system has similar macroscopic properties. Furthermore it was examined the memory string of the system. We concluded that opposite to theorem-6: a) at a common point the system can reach in a finite (not an infinite) number of ways, b) a correction for the thickness of the adsorbed film prior to capillary condensation is necessary, and c) the scattering curves although at high-Q values coincide, at low-Q values are different indicating different microscopic states...
2016: PloS One
Gabriel A Canova, Yan Levin, Jeferson J Arenzon
We study a generalization of the XY model with an additional nematic-like term through extensive numerical simulations and finite-size techniques, both in two and three dimensions. While the original model favors local alignment, the extra term induces angles of 2π/q between neighboring spins. We focus here on the q=8 case (while presenting new results for other values of q as well) whose phase diagram is much richer than the well-known q=2 case. In particular, the model presents not only continuous, standard transitions between Berezinskii-Kosterlitz-Thouless (BKT) phases as in q=2, but also infinite-order transitions involving intermediate, competition-driven phases absent for q=2 and 3...
September 2016: Physical Review. E
Fumitoshi Kaneko, Naoki Seto, Shuma Sato, Aurel Radulescu, Maria Maddalena Schiavone, Jürgen Allgaier, Koichi Ute
Syndiotactic polystyrene (sPS) is a crystalline polymer which has a unique property; it is able to form cocrystals with a wide range of chemical compounds, in which the guest molecules are confined in the vacancies of the host sPS crystalline region. Recently, it has been found that even polyethylene glycol oligomers with a molecular weight of more than several hundreds can be introduced into the sPS crystalline region. It is quite important to know how such a long-chain molecule is stored in the host sPS lattice...
October 1, 2016: Journal of Applied Crystallography
Christopher D Putnam
The Guinier region in small-angle X-ray scattering (SAXS) defines the radius of gyration, Rg, and the forward scattering intensity, I(0). In Guinier peak analysis (GPA), the plot of qI(q) versus q(2) transforms the Guinier region into a characteristic peak for visual and automated inspection of data. Deviations of the peak position from the theoretical position in dimensionless GPA plots can suggest parameter errors, problematic low-resolution data, some kinds of intermolecular interactions or elongated scatters...
October 1, 2016: Journal of Applied Crystallography
Kyoung-Nam Kim, Sang-Doc Han, Jeung-Hoon Seo, Phil Heo, Dongkyeom Yoo, Geun Ho Im, Jung Hee Lee
The birdcage (BC) coil is currently being utilized for uniform radiofrequency (RF) transmit/receive (Tx/Rx) or Tx-only configuration in many magnetic resonance (MR) imaging applications, but insufficient magnetic flux (|B1|) density and their non-uniform distribution still exists in high-field (HF) environments. We demonstrate that the asymmetric birdcage (ABC) transmit/receive (Tx/Rx) volume coil, which is a modified standard birdcage (SBC) coil with the end ring split into two halves, is suitable for improving the |B1| sensitivity in 7T small-animal MR imaging...
September 30, 2016: Magnetic Resonance in Medical Sciences: MRMS
B Q Wei, N Yan, J X Gao, D D Li, Z G Shang, K He
This paper studies the absolute thickness measurement of pyrolytic graphite spheroids (GSs) by using STEM-EELS mode with log-ratio method and Kramers-Kroning (K-K) method, taking the measured thickness from TEM image as reference that is the diameter of GSs ranging from 60 to 250nm. The effect of collection semi-angle (β) on thickness measurement has been investigated. It is found that in general the thickness obtained by K-K analysis with surface effect corrected shows the best accuracy, followed by K-K sum rule and then log-ratio method for the three different collection semi-angles of 12...
October 4, 2016: Micron: the International Research and Review Journal for Microscopy
Joshua J Cardiel, Daisuke Takagi, Hsieh-Fu Tsai, Amy Q Shen
Understanding the formation and instability behavior of membranes is of fundamental interest and practical relevance to various biotechnological applications and self-assembly systems. Surfactant micellar membranes serve as a simple model system when surfactant molecules self-assemble into micellar structures under flow, but observing such process in real time is a major challenge due to limitations in spatiotemporal resolutions. We use a simple T-shaped microchannel to capture the formation and flow behavior of an ionic surfactant micro-micellar-membrane (μMM) when an aqueous stream of organic salt sodium salicylate (NaSal) meets a stream of cationic surfactant cetyltrimethylammonium bromide (CTAB)...
October 4, 2016: Soft Matter
Mehdi Moghtadaei, Babak Otoukesh, Bahram Bodduhi, Keyvan Ahmadi, Ali Yeganeh
INTRODUCTION: Genovarum is a common orthopedic problem. Its optimal prompt treatment is an issue of importance. AIM: This study was conducted to determine the radiographic changes in patella bone before and after open wedge high tibial osteotomy. MATERIAL AND METHODS: In this quasi-experimental study, 43 patients were enrolled and underwent open wedge high tibial osteotomy and the radiographic and CT-scan indices including Q-Angle, Congruence Angle, Insall-Salvati index, and TTTG were measured and compared before and after surgery...
July 27, 2016: Medical Archives
Maxx Q Arguilla, Jyoti Katoch, Kevin Krymowski, Nicholas D Cultrara, Jinsong Xu, Xiaoxiang Xi, Amanda Hanks, Shishi Jiang, Richard Dominic Ross, Roland J Koch, Søren Ulstrup, Aaron Bostwick, Chris M Jozwiak, David W McComb, Eli Rotenberg, Jie Shan, Wolfgang Windl, Roland Kenji Kawakami, Joshua E Goldberger
The discovery of new families of exfoliatable 2D crystals that have diverse sets of electronic, optical, and spin-orbit coupling properties, enables the realization of unique physical phenomena in these few-atom thick building blocks and in proximity to other materials. Herein, using NaSn2As2 as a model system, we demonstrate that layered Zintl phases having the stoichiometry ATt2Pn2 (A = Group 1 or 2 element, Tt = Group 14 tetrel element and Pn = Group 15 pnictogen element) and feature networks separated by van der Waals gaps can be readily exfoliated with both mechanical and liquid-phase methods...
October 4, 2016: ACS Nano
Genya Mitani, Takashi Maeda, Tomonori Takagaki, Kosuke Hamahashi, Kenji Serigano, Yutaka Nakamura, Masato Sato, Joji Mochida
Many groups have reported good to excellent clinical outcomes of the Elmslie-Trillat (ET) procedure for recurrent dislocation of the patella. However, the mean follow-up period of these studies was no more than 5 years. We hypothesized that the long-term postoperative outcomes of the modified ET procedure for recurrent dislocation of the patella would be acceptable compared with those of other procedures. The long-term postoperative outcomes of patients treated with the modified ET procedure were examined. A total of 31 knees in 27 patients with recurrent dislocation of the patella who underwent a modified ET procedure (without medial capsular plication) were evaluated...
October 3, 2016: Journal of Knee Surgery
L-K Zeng, R Lou, D-S Wu, Q N Xu, P-J Guo, L-Y Kong, Y-G Zhong, J-Z Ma, B-B Fu, P Richard, P Wang, G T Liu, L Lu, Y-B Huang, C Fang, S-S Sun, Q Wang, L Wang, Y-G Shi, H M Weng, H-C Lei, K Liu, S-C Wang, T Qian, J-L Luo, H Ding
By combining angle-resolved photoemission spectroscopy and quantum oscillation measurements, we performed a comprehensive investigation on the electronic structure of LaSb, which exhibits near-quadratic extremely large magnetoresistance (XMR) without any sign of saturation at magnetic fields as high as 40 T. We clearly resolve one spherical and one intersecting-ellipsoidal hole Fermi surfaces (FSs) at the Brillouin zone (BZ) center Γ and one ellipsoidal electron FS at the BZ boundary X. The hole and electron carriers calculated from the enclosed FS volumes are perfectly compensated, and the carrier compensation is unaffected by temperature...
September 16, 2016: Physical Review Letters
Daniel Cortez, Nandita Sharma, Pei-Ni Jone
BACKGROUND: Kawasaki disease (KD) is the leading cause of acquired heart disease in children. Signal average electrocardiogram changes in patients during the acute phase of KD with coronary artery anomalies (CAA) include depolarization changes. We set out to determine if 12-lead-derived atrioventricular depolarization differences can identify CAA in patients with KD. METHODS: A blinded, retrospective case-control study of patients with KD was performed. Deep Q waves, corrected QT-intervals (QTc), spatial QRS-T angles, T-wave vector magnitudes (RMS-T), and a novel parameter for assessment of atrioventricular depolarization difference (the spatial PR angle) and a two dimensional PR angle were assessed...
September 28, 2016: Annals of Noninvasive Electrocardiology
Zheng Yan, Fan Zhang, Fei Liu, Mengdi Han, Dapeng Ou, Yuhao Liu, Qing Lin, Xuelin Guo, Haoran Fu, Zhaoqian Xie, Mingye Gao, Yuming Huang, JungHwan Kim, Yitao Qiu, Kewang Nan, Jeonghyun Kim, Philipp Gutruf, Hongying Luo, An Zhao, Keh-Chih Hwang, Yonggang Huang, Yihui Zhang, John A Rogers
Capabilities for assembly of three-dimensional (3D) micro/nanostructures in advanced materials have important implications across a broad range of application areas, reaching nearly every class of microsystem technology. Approaches that rely on the controlled, compressive buckling of 2D precursors are promising because of their demonstrated compatibility with the most sophisticated planar technologies, where materials include inorganic semiconductors, polymers, metals, and various heterogeneous combinations, spanning length scales from submicrometer to centimeter dimensions...
September 2016: Science Advances
Q Wan, R C Masters, D Lidzey, K J Abrams, M Dapor, R A Plenderleith, S Rimmer, F Claeyssens, C Rodenburg
Recently developed detectors can deliver high resolution and high contrast images of nanostructured carbon based materials in low voltage scanning electron microscopes (LVSEM) with beam deceleration. Monte Carlo Simulations are also used to predict under which exact imaging conditions purely compositional contrast can be obtained and optimised. This allows the prediction of the electron signal intensity in angle selective conditions for back-scattered electron (BSE) imaging in LVSEM and compares it to experimental signals...
September 15, 2016: Ultramicroscopy
Wei Zhou, Eric R Muir, Steven Chalfin, Kundandeep S Nagi, Timothy Q Duong
PURPOSE OF THE STUDY: The purpose of the study was to evaluate neurodegeneration along brain visual pathways in primary open angle glaucoma (POAG) using improved analysis methods of volumetric and diffusion tensor magnetic resonance imaging (MRI) data. METHODS: Eleven POAG patients (60.0±9.2 y) with primarily mild to moderate POAG and 11 age-matched controls (55.9±7.5 y) were studied using structural and diffusion tensor MRI. Surface-based segmentation was applied to structural MRI to obtain visual cortical area and volume...
September 21, 2016: Journal of Glaucoma
Dongdong Han, Xinyu Xie, Lingwei Zheng, Li Huang
BACKGROUND: The method of characteristics (also called as the slip-line method) is used to calculate the bearing capacity of strip footings on ponderable soil. The soil is assumed to be a rigid plastic that conforms to the Mohr-Coulomb criterion. The solution procedures proposed in this paper is implemented using a finite difference method and suitable for both smooth and rough footings. By accounting for the influence of the cohesion c, the friction angle ϕ and the unit weight γ of the soil in one failure mechanism, the solution can strictly satisfy the required boundary conditions...
2016: SpringerPlus
Guenther Maderbacher, Clemens Baier, Hans-Robert Springorum, Hermann Maderbacher, Anne-Maria Birkenbach, Achim Benditz, Joachim Grifka, Armin Keshmiri
Correct rotational implant alignment is associated with increased postoperative function and implant survival in total knee arthroplasty (TKA). Due to conformity between tibial and femoral implants, particularly in full extension, we assumed a mutual interference of femoral and tibial component rotations. We, therefore, hypothesized that different rotational alignments of the tibial or femoral components change the rotational postures between the tibia and femur after TKA. In 10 healthy knees of whole body cadavers, TKA was performed...
September 19, 2016: Journal of Knee Surgery
F Wang, Q Guan, P Zang, X Liu, T Yang, H Song
Objective: The aim of this study was to report a case that underwent a craniotomy after primary pre-operative cerebrovascular and 3D digital subtract angiography (DSA) showed wrong outcomes. Digital subtract angiography misdiagnosis and missed diagnosis of aneurysms were found and the subject was subsequently treated correspondingly. This case was analysed to identify 1) the cause of the false positive and false negative results in DSA, 2) the limitations of 3D DSA and 3) the experience and lessons learned...
March 30, 2016: West Indian Medical Journal
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