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stand thinning

William Poulson, Alexey Kamenskiy, Andreas Seas, Paul Deegan, Carol Lomneth, Jason MacTaggart
BACKGROUND: High failure rates of femoropopliteal artery (FPA) interventions are often attributed in part to severe mechanical deformations that occur with limb movement. Axial compression and bending of the FPA likely play significant roles in FPA disease development and reconstruction failure, but these deformations are poorly characterized. The goal of this study was to quantify axial compression and bending of human FPAs that are placed in positions commonly assumed during the normal course of daily activities...
May 16, 2017: Journal of Vascular Surgery
Mairéad McNally, Ion Cretu
Nonsteroidal anti-inflammatory drugs are a common cause of intestinal injury. A variety of NSAID-induced injuries may occur including ulcers, erosions, colitis, strictures, and diaphragm disease. Diaphragm disease refers to the development of multiple thin, concentric, stenosing strictures in the intestine. Strictures occur most often in the midintestine and are thought to be pathognomonic of NSAID damage. They can lead to intermittent or complete bowel obstruction. Diagnosis may be elusive as there is nothing specific about NSAID-induced injury at endoscopy and histology is also nonspecific...
2017: Case Reports in Medicine
Allison Yau, Wonsuk Cha, Matthew W Kanan, G Brian Stephenson, Andrew Ulvestad
Polycrystalline material properties depend on the distribution and interactions of their crystalline grains. In particular, grain boundaries and defects are crucial in determining their response to external stimuli. A long-standing challenge is thus to observe individual grains, defects, and strain dynamics inside functional materials. Here we report a technique capable of revealing grain heterogeneity, including strain fields and individual dislocations, that can be used under operando conditions in reactive environments: grain Bragg coherent diffractive imaging (gBCDI)...
May 19, 2017: Science
D Wijayanti, E T Setiatin, E Kurnianto
AIM: The purpose of this study was to determine the postpartum estrus cycle of guinea pigs (Cavia cobaya) using Anredera cordifolia leaf extract. MATERIALS AND METHODS: Materials used were 8 males and 8 females of C. cobaya with body weight ranged 400-450 g. Mating ratio applied was 1:1. Treatments given were 0, 10, 50 and 90 mg of A. cordifolia leaf extract/head, designated as T0, T1, T2 and T3, respectively. Two females were subjected for each treatment. A. cordifolia leaf extract was administered orally from 10 days prepartum to 10 days postpartum...
April 2017: Veterinary World
O El-Atwani, J E Nathaniel, A C Leff, K Hattar, M L Taheri
Crystal defects generated during irradiation can result in severe changes in morphology and an overall degradation of mechanical properties in a given material. Nanomaterials have been proposed as radiation damage tolerant materials, due to the hypothesis that defect density decreases with grain size refinement due to the increase in grain boundary surface area. The lower defect density should arise from grain boundary-point defect absorption and enhancement of interstitial-vacancy annihilation. In this study, low energy helium ion irradiation on free-standing iron thin films were performed at 573 K...
May 12, 2017: Scientific Reports
Yi-Kai Lo, Yen-Cheng Kuan, Stanislav Culaclii, Brian Kim, Po-Min Wang, Chih-Wei Chang, Jonathan A Massachi, Minji Zhu, Kuanfu Chen, Parag Gad, V Reggie Edgerton, Wentai Liu
This paper presents a wirelessly powered, fully integrated system-on-a-chip (SoC) supporting 160-channel stimulation, 16-channel recording, and 48-channel bio-impedance characterization to enable partial motor function recovery through epidural spinal cord electrical stimulation. A wireless transceiver is designed to support quasi full-duplex data telemetry at a data rate of 2 Mb/s. Furthermore, a unique in situ bio-impedance characterization scheme based on time-domain analysis is implemented to derive the Randles cell electrode model of the electrode-electrolyte interface...
May 5, 2017: IEEE Transactions on Biomedical Circuits and Systems
Kevin J Freedman, Gaurav Goyal, Chi Won Ahn, Min Jun Kim
The use of atomically thin graphene for molecular sensing has attracted tremendous attention over the years and, in some instances, could displace the use of classical thin films. For nanopore sensing, graphene must be suspended over an aperture so that a single pore can be formed in the free-standing region. Nanopores are typically drilled using an electron beam (e-beam) which is tightly focused until a desired pore size is obtained. E-beam sculpting of graphene however is not just dependent on the ability to displace atoms but also the ability to hinder the migration of ad-atoms on the surface of graphene...
May 10, 2017: Sensors
Liman Yang, Langfu Cui, Yunhua Li, Chao An
Metal roof sheathings are widely employed in large-span buildings because of their light weight, high strength and corrosion resistance. However, their severe working environment may lead to deformation, leakage and wind-lift, etc. Thus, predicting these damages in advance and taking maintenance measures accordingly has become important to avoid economic losses and personal injuries. Conventionally, the health monitoring of metal roofs mainly relies on manual inspection, which unavoidably compromises the working efficiency and cannot diagnose and predict possible failures in time...
May 6, 2017: Sensors
Galina L Klimchitskaya, Vladimir Mostepanenko
The Casimir free energy of dielectric films, both free-standing in vacuum and deposited on metallic or dielectric plates, is investigated. It is shown that the values of the free energy depend considerably on whether the calculation approach used neglects or takes into account the dc conductivity of film material. We demonstrate that there are the material-dependent and universal classical limits in the former and latter cases, respectively. The analytic behavior of the Casimir free energy and entropy for a free-standing dielectric film at low temperature is found...
May 8, 2017: Journal of Physics. Condensed Matter: An Institute of Physics Journal
Amin Abnavi, Mojtaba Sadati Faramarzi, Ali Abdollahi, Reza Ramezani, Shahnaz Ghasemi, Zeinab Sanaee
Here, we report 3D hierarchical SnO<sub>2</sub> nanowires (NWs) core-amorphous Silicon shell on free-standing carbon nanotube paper (SnO<sub>2</sub>@a-Si/CNT paper) as an effective anode for flexible Lithium ion battery (LIB) application. This binder-free electrode exhibits a high initial discharge capacity of 3020 mAh/g with a large reversible charge capacity of 1250 mAh/g at a current density of 250 mA/g. Compared to other SnO<sub>2</sub> NW or its core-shell nanostructure anodes, the fabricated SnO<sub>2</sub>@a-Si/CNT structure demonstrates an outstanding performance with high mass loading (⁓5...
May 5, 2017: Nanotechnology
Feng Wu, Yu-Sheng Ye, Jia-Qi Huang, Teng Zhao, Ji Qian, Yuan-Yuan Zhao, Li Li, Lei Wei, Rui Luo, Yong-Xin Huang, Yi Xing, Ren-Jie Chen
The behavior of two-dimensional (2D) materials for energy storage systems relates to their morphology and physicochemical properties. Although various 2D materials can be found in different fields, the open access of these materials has greatly hampered their practical applications, such as in lithium-sulfur (Li-S) batteries, where the soluble intermediates should be controlled. Here, we have developed a facile approach to prepare 2D ultrathin interconnected carbon fabrics (ICFs) with "bubble-like" morphology and abundant mesopores using a "blowing bubble" method...
May 1, 2017: ACS Nano
M Selmi, J-C Loudet, P V Dolganov, T Othman, P Cluzeau
We report an experimental investigation of the structure of periodic patterns observed in the meniscus of free-standing smectic films. Combination of polarizing optical microscopy and phase shifting interferometry enabled us to obtain new information on the structure of the meniscus, and in particular, on the topography of the smectic-air interface. We investigate the profile of the undulations in the striped structure in the thin part of the meniscus, change of the stripe period with the meniscus thickness and subsequent transition into a two-dimensional structure...
April 27, 2017: Soft Matter
Jill E Harvey, Dan J Smith, Thomas T Veblen
This study examines spatially variable stand structure and fire-climate relationships at a low elevation forest-grassland ecotone in west central British Columbia, Canada. Fire history reconstructions were based on samples from 92 fire-scarred trees and stand demography from 27 plots collected over an area of about 7 km(2) . We documented historical chronologies of widespread fires and localized grassland fires between AD 1600 and 1900. Relationships between fire events, reconstructed values of the Palmer Drought Severity Index and annual precipitation were examined using superposed epoch and bivariate event analyses...
April 23, 2017: Ecological Applications: a Publication of the Ecological Society of America
Susanne Mohr, Tobias Schmitt, Tibor Döpper, Feifei Xiang, Matthias Schwarz, Andreas Görling, M Alexander Schneider, Jörg Libuda
We investigated the adsorption behavior of 4,4'-biphenhyl dicarboxylic acid (BDA) on well-ordered CoO(111) films grown on Ir(100) as a function of coverage and temperature using time-resolved and temperature-programmed infrared reflection absorption spectroscopy (TR-IRAS, TP-IRAS) in combination with density functional theory (DFT) and scanning tunneling microscopy (STM) under ultrahigh vacuum (UHV) conditions. To compare the binding behavior of BDA as a function of the oxide film thickness, three different CoO(111) film thicknesses were explored: films of about 20 bilayers (BLs) (approximately 5 nm), 2 BLs, and 1 BL...
April 19, 2017: Langmuir: the ACS Journal of Surfaces and Colloids
Fangwang Gou, Haiwei Chen, Ming-Chun Li, Seok-Lyul Lee, Shin-Tson Wu
We report a vertically-aligned liquid crystal display (LCD) device with submillisecond response time, high transmittance, and low operation voltage. The top substrate has a common electrode, while the bottom substrate consists of hole-patterned fringing-field-switching (FFS) pixel electrodes. A negative dielectric anisotropy LC is employed. In the voltage-on state, the LC directors are reoriented by the fringing fields surrounding the hole area and by the longitudinal and fringe fields outside the hole area...
April 3, 2017: Optics Express
Federico Selvi, Elisa Carrari, Ilaria Colzi, Andrea Coppi, Cristina Gonnelli
Introduction of non-native trees is one of the major threats to ecosystem integrity and biodiversity. Stands of maritime pine (Pinus pinaster Ait.) introduced decades ago represent a threat to the specialized plant communities of serpentine outcrops in Italy. This study investigates the effects of such invasions at the community and species level, based on vegetation sampling in three selected sites with comparable environmental conditions. Pine cover caused a decrease of α-diversity by lowering the species evenness of the community, though species richness was not negatively affected...
October 1, 2017: Science of the Total Environment
Niyati Parikh, Dmitri K Klimov
Using an all-atom explicit water model and replica exchange with solute tempering molecular dynamics we have studied the binding of Aβ10-40 peptides to the mixed cationic bilayers composed of DMPC lipids and C14-KAAK lipopeptides (LPs). Using as a control our previous replica exchange simulations probing binding of the same peptide to the zwitterionic DMPC bilayer we assessed the impact of lipopeptides on the Aβ binding mechanism. We found that binding to the mixed DMPC + LP bilayers does not enhance the Aβ helix propensity as much as binding to the pure DMPC bilayers...
April 12, 2017: Physical Chemistry Chemical Physics: PCCP
Zheng Wang, Lu Gan, Haiping He, Zhizhen Ye
Monolayer ZnO represents a class of new two-dimensional (2D) materials that are expected to exhibit unique optoelectronic properties and applications. Here we report a novel strategy to synthesize free-standing atomically thin ZnO layers via the oxidation of hydrothermally grown ultrathin zinc chalcogenide nanosheets. With micrometer-scaled lateral size, the obtained ultrathin ZnO layer has a thickness of ∼2 nm, and the layered structure still maintained well after high temperature oxidation. The thermal treatment strongly improves the crystal quality as well without inducing cracks or pinholes in the ultrathin layers...
April 5, 2017: ACS Applied Materials & Interfaces
S Lagomarsino, S Calusi, M Massi, N Gelli, S Sciortino, F Taccetti, L Giuntini, A Sordini, M Vannoni, F Bosia, D Gatto Monticone, P Olivero, B A Fairchild, P Kashyap, A D C Alves, M A Strack, S Prawer, A D Greentree
Ion irradiation is a widely employed tool to fabricate diamond micro- and nano-structures for applications in integrated photonics and quantum optics. In this context, it is essential to accurately assess the effect of ion-induced damage on the variation of the refractive index of the material, both to control the side effects in the fabrication process and possibly finely tune such variations. Several partially contradictory accounts have been provided on the effect of the ion irradiation on the refractive index of single crystal diamond...
March 24, 2017: Scientific Reports
Saejin Oh, Myungjae Yang, Jean Bouffard, Seunghun Hong, So-Jung Park
Here, we demonstrate that the self-assembly of poly(3-hexylthiophene) (P3HT) at the air-water interface can lead to free-standing films of densely packed P3HT nanowires. Interfacial self-assembly on various liquid subphases, such as water, diethylene glycol, and glycerol, indicates that the viscosity of the subphase is an important factor for the formation of well-ordered nanostructures. The thin-film morphology is also sensitive to the concentration of P3HT, its molecular weight (MW), and the presence of oxidative defects...
April 3, 2017: ACS Applied Materials & Interfaces
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