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https://www.readbyqxmd.com/read/28523354/investigation-of-reference-levels-and-radiation-dose-associated-with-abdominal-evar-endovascular-aneurysm-repair-procedures-across-several-european-centres
#1
E Tuthill, L O'Hora, M O'Donohoe, S Panci, P Gilligan, D Campion, R Trenti, E Fox, D Catania, L Rainford
OBJECTIVES: Endovascular aneurysm repair (EVAR) is considered the treatment of choice for abdominal aortic aneurysms with suitable anatomy. In order to improve radiation safety, European Directive (2013/59) requires member states to implement diagnostic reference levels (DRLs) in radio-diagnostic and interventional procedures. This study aimed to determine local DRLs for EVAR across five European centres and identify an interim European DRL, which currently remains unestablished. METHODS: Retrospective data was collected for 180 standard EVARs performed between January 2014 and July 2015 from five specialist centres in Ireland (n=2) and Italy (n=3)...
May 18, 2017: European Radiology
https://www.readbyqxmd.com/read/28451667/potassium-adsorption-behavior-on-hcp-cobalt-as-model-systems-for-the-fischer-tropsch-synthesis-a-density-functional-theory-study
#2
Qingjun Chen, Ingeborg-Helene Svenum, Yanying Qi, Ljubisa Gavrilovic, De Chen, Anders Holmen, Edd A Blekkan
Potassium (K), an important impurity in syngas from biomass, can have a large influence on the activity and selectivity of cobalt-based Fischer-Tropsch synthesis (FTS) catalysts in Biomass to Liquids (BTL) processes. In this work, the potassium adsorption behavior on hcp cobalt was systematically studied using density functional theory. The surface energy calculations and Wulff construction of the equilibrium shape of hcp cobalt showed it is dominated by 10 facets. The interaction of K with these facets has been investigated...
May 17, 2017: Physical Chemistry Chemical Physics: PCCP
https://www.readbyqxmd.com/read/28437970/cmos-compatible-broadband-co-propagative-stationary-fourier-transform-spectrometer-integrated-on-a-silicon-nitride-photonics-platform
#3
Xiaomin Nie, Eva Ryckeboer, Gunther Roelkens, Roel Baets
We demonstrate a novel type of Fourier Transform Spectrometer (FTS) that can be realized with CMOS compatible fabrication techniques. This FTS contains no moving components and is based on the direct detection of the interferogram generated by the interference of the evanescent fields of two co-propagating waveguide modes. The theoretical analysis indicates that this type of FTS inherently has a large bandwidth (>100 nm). The first prototype that is integrated on a Si<sub>3</sub>N<sub>4</sub> waveguide platform is demonstrated and has an extremely small size (0...
April 17, 2017: Optics Express
https://www.readbyqxmd.com/read/28435327/effect-of-menopause-on-hormonal-receptors-in-ampullae-of-the-fallopian-tube-with-a-special-reference-to-the-p53-signature
#4
Rie Urabe, Toru Hachisuga, Taeko Ueda, Toshinori Kawagoe, Tomoko Kurita, Seiji Kagami, Masanori Hisaoka, Yoshihisa Fujino
OBJECTIVES: Age-related changes in the expression of hormonal receptors have not been well examined in the fallopian tube (FT). We herein report the effect of menopause on the hormone receptors in ampullae of the FTs (AFTs), in comparison with cortical inclusion cysts (CICs) of the ovary. METHODS: A total of 84 AFTs and 16 fimbriae of FTs, which were obtained from 26 premenopausal and 58 postmenopausal women; and 27 postmenopausal CICs were immunohistochemically studied for the expression of p53, Ki-67, estrogen receptor-alpha (ER-α), and progesterone receptor A (PRA)...
2017: International Journal of Women's Health
https://www.readbyqxmd.com/read/28407537/co2-emissions-from-the-2010-russian-wildfires-using-gosat-data
#5
Meng Guo, Jing Li, Jiawei Xu, Xiufeng Wang, Hongshi He, Li Wu
In the summer of 2010, more than 6 hundred wildfires broke out in western Russia because of an unprecedented intense heat wave that resulted from strong atmospheric blocking. The present study evaluated the CO2 emissions using GOSAT (Greenhouse gases Observing SATellite) data from July 23 to August 18, 2010 for western Russia. The results demonstrated that the GOSAT CAI (Cloud and Aerosol Imager) was well-suited for the identification of smoke plumes and that the GOSAT FTS (Fourier-Transform Spectrometer) TIR (Thermal InfraRed) could be used to calculate the height of the plumes at approximately 800 hPa (1...
April 10, 2017: Environmental Pollution
https://www.readbyqxmd.com/read/28390057/mechanical-properties-of-6-finger-trap-suture-techniques
#6
Naomi F Earley, Lee B Meakin, Kevin J Parsons, John Tarlton, Jon L Hall
OBJECTIVE: To identify the most common methods used by surgeons to place finger-trap sutures (FTS), and determine their influence on the biomechanical properties of constructs. STUDY DESIGN: Questionnaire and experimental study. METHODS: Six commonly used FTS methods (A-F) were identified from literature review and questionnaire. Constructs made with 3-metric nylon suture and 18-French polyurethane esophagostomy tubing were tested in axial loading to failure...
April 8, 2017: Veterinary Surgery: VS
https://www.readbyqxmd.com/read/28362792/demonstration-of-a-compressive-sensing-fourier-transform-on-chip-spectrometer
#7
Hugh Podmore, Alan Scott, Pavel Cheben, Aitor V Velasco, Jens H Schmid, Martin Vachon, Regina Lee
We demonstrate compressive-sensing (CS) spectroscopy in a planar-waveguide Fourier-transform spectrometer (FTS) device. The spectrometer is implemented as an array of Mach-Zehnder interferometers (MZIs) integrated on a photonic chip. The signal from a set of MZIs is composed of an undersampled discrete Fourier interferogram, which we invert using l<sub>1</sub>-norm minimization to retrieve a sparse input spectrum. To implement this technique, we use a subwavelength-engineered spatial heterodyne FTS on a chip composed of 32 independent MZIs...
April 1, 2017: Optics Letters
https://www.readbyqxmd.com/read/28345057/chemical-imaging-of-fischer-tropsch-catalysts-under-operating-conditions
#8
Stephen W T Price, David J Martin, Aaron D Parsons, Wojciech A Sławiński, Antonios Vamvakeros, Stephen J Keylock, Andrew M Beale, J Frederick W Mosselmans
Although we often understand empirically what constitutes an active catalyst, there is still much to be understood fundamentally about how catalytic performance is influenced by formulation. Catalysts are often designed to have a microstructure and nanostructure that can influence performance but that is rarely considered when correlating structure with function. Fischer-Tropsch synthesis (FTS) is a well-known and potentially sustainable technology for converting synthetic natural gas ("syngas": CO + H2) into functional hydrocarbons, such as sulfur- and aromatic-free fuel and high-value wax products...
March 2017: Science Advances
https://www.readbyqxmd.com/read/28291528/global-finite-time-adaptive-control-for-uncalibrated-robot-manipulator-based-on-visual-servoing
#9
Tao Li, Hui Zhao
The paper addresses the finite-time convergence problem of a uncalibrated camera-robot system with uncertainties. These uncertainties include camera extrinsic and intrinsic parameters, robot dynamics and feature depth parameters, which are all considered as time-varying uncertainties. In order to achieve a better dynamic stability performance of the camera-robot system, a novel FTS adaptive controller is presented to cope with rapid convergence problem. Meanwhile, FTS adaptive laws are proposed to handle these uncertainties which exist both in robot and in camera model...
March 11, 2017: ISA Transactions
https://www.readbyqxmd.com/read/28282781/fetal-brain-anomalies-detection-during-the-first-trimester-expanding-the-scope-of-antenatal-sonography
#10
Eldad Katorza, Itai Gat, Nir Duvdevani, Nir Meller, Noam Pardo, Eran Barzilay, Reuven Achiron
PURPOSE: The purpose of this study was to describe fetal brain anomalies identified during nuchal translucency (NT) examination and their clinical management. MATERIALS AND METHODS: In this retrospective study, we evaluated charts of pregnant women performed the first trimester scan (FTS) between 1.1.2011 and 31.12.14 in a tertiary referral center. Study population consisted of 952 patients scheduled for routine NT scan for aneuploidy screening between 11.0 and 13...
February 15, 2017: Journal of Maternal-fetal & Neonatal Medicine
https://www.readbyqxmd.com/read/28281610/the-standard-of-newly-qualified-dental-graduates-foundation-trainer-perceptions
#11
C J Oxley, R Dennick, P Batchelor
Background There have been anecdotal concerns that the skill mix of recently qualified graduates is very different to those qualifying several years ago, in particular that the clinical skills on qualification are less. If true, such changes may have ramifications for providers of undergraduate training, postgraduate training, particularly at foundation training level, and ultimately the public.Aim The aim of this study was to assess changes in perceived standards of newly qualified graduates as reported by foundation trainers...
March 10, 2017: British Dental Journal
https://www.readbyqxmd.com/read/28281517/-diabetes-mellitus-and-nonalcoholic-fatty-liver-disease-the-verges-of-contingency
#12
I G Bakulin, Yu G Sandler, E V Vinnitskaya, V A Keiyan, S V Rodionova, D L Rotin
AIM: To estimate the incidence of hepatic steatosis (HS) and liver fibrosis (LF) in patients with diabetes mellitus (DM), by applying the noninvasive techniques of liver fibroelastometry (LFE) and a battery of fibrotests (FTs); to determine their diagnostic value and to identify factors influencing the development of LF. SUBJECTS AND METHODS: A comprehensive examination was made in 82 diabetic patients (mean age, 56.7±12.7 years; p=0.033). The data were statistically evaluated using ROC curve analysis, correlation and single-factor analyses of variance, and multiple logistic regression analysis...
2017: Terapevticheskiĭ Arkhiv
https://www.readbyqxmd.com/read/28241520/optical-rotatory-dispersion-measurement-approach-using-the-nonlinear-behavior-of-the-geometric-phase
#13
Makoto Ginya, Makoto Kimura, Tetsuo Iwata
We propose a method for high-sensitivity optical rotatory dispersion (ORD) measurement of optically active samples that takes advantage of the nonlinear behavior of the geometric phase (GP). To measure the GP as a function of wavelength, we use a multichannel Fourier transform spectrometer (MC-FTS) that is based on Savart plate birefringent-polarization interference, into which we newly insert a zeroth-order quarter-wave plate (QWP). The modified MC-FTS allows us to measure the wavelength dependence of the GP and thus that of the optical rotation angle due to the sample...
February 20, 2017: Optics Express
https://www.readbyqxmd.com/read/28218502/serous-tubal-intraepithelial-carcinomas-associated-with-high-grade-serous-ovarian-carcinomas-a-systematic-review
#14
REVIEW
F Chen, K Gaitskell, M J Garcia, A Albukhari, J Tsaltas, A A Ahmed
BACKGROUND: Serous tubal intraepithelial carcinomas (STICs) have been documented in high-grade serous ovarian carcinomas (HGSOCs). However, the rate of association between STICs and HGSOCs and, therefore, the fraction of HGSOCs that are likely to have originated from the fallopian tube (FT), has remained unclear. OBJECTIVE: To appraise the literature describing the association between STICs and established HGSOCs. SEARCH STRATEGY: Ovid MEDLINE and EMBASE were searched...
February 20, 2017: BJOG: An International Journal of Obstetrics and Gynaecology
https://www.readbyqxmd.com/read/28216312/bone-marrow-lesions-on-magnetic-resonance-imaging-in-hand-osteoarthritis-are-associated-with-pain-and-interact-with-synovitis
#15
R Liu, W Damman, M Reijnierse, J L Bloem, F R Rosendaal, M Kloppenburg
OBJECTIVE: To determine the association between bone marrow lesions (BMLs) and (teno)synovitis as assessed on magnetic resonance (MR) imaging in patients with pain in hand osteoarthritis (OA). METHODS: In 105 consecutive primary hand OA patients (83% women, mean age 59 years), who were diagnosed by rheumatologists and included in the HOSTAS (Hand OSTeoArthritis in Secondary care) cohort, contrast enhanced MR imaging of right distal and proximal interphalangeal joints were obtained...
February 12, 2017: Osteoarthritis and Cartilage
https://www.readbyqxmd.com/read/28194455/structural-and-elemental-influence-from-various-mofs-on-the-performance-of-fe-c-catalysts-for-fischer-tropsch-synthesis
#16
Tim A Wezendonk, Quirinus S E Warringa, Vera P Santos, Adam Chojecki, Matthijs Ruitenbeek, Garry Meima, Michiel Makkee, Freek Kapteijn, Jorge Gascon
The structure and elementary composition of various commercial Fe-based MOFs used as precursors for Fischer-Tropsch synthesis (FTS) catalysts have a large influence on the high-temperature FTS activity and selectivity of the resulting Fe on carbon composites. The selected Fe-MOF topologies (MIL-68, MIL-88A, MIL-100, MIL-101, MIL-127, and Fe-BTC) differ from each other in terms of porosity, surface area, Fe and heteroatom content, crystal density and thermal stability. They are re-engineered towards FTS catalysts by means of simple pyrolysis at 500 °C under a N2 atmosphere and afterwards characterized in terms of porosity, crystallite phase, bulk and surface Fe content, Fe nanoparticle size and oxidation state...
April 28, 2017: Faraday Discussions
https://www.readbyqxmd.com/read/28186212/computational-investigation-of-the-kinetics-and-mechanism-of-the-initial-steps-of-the-fischer-tropsch-synthesis-on-cobalt
#17
Pieter van Helden, Jan-Albert van den Berg, Melissa A Petersen, Werner Janse van Rensburg, Ionel M Ciobîcă, Jan van de Loosdrecht
A multi-site microkinetic model for the Fischer-Tropsch synthesis (FTS) reaction up to C2 products on a FCC cobalt catalyst surface is presented. This model utilizes a multi-faceted cobalt nanoparticle model for the catalyst, consisting of the two dominant cobalt surface facets Co(111) and Co(100), and a step site represented by the Co(211) surface. The kinetic parameters for the intermediates and transition states on these sites were obtained using plane-wave, periodic boundary condition density functional theory...
April 28, 2017: Faraday Discussions
https://www.readbyqxmd.com/read/28184397/carbon-induced-selective-regulation-of-cobalt-based-fischer-tropsch-catalysts-by-ethylene-treatment
#18
Peng Zhai, Pei-Pei Chen, Jinglin Xie, Jin-Xun Liu, Huabo Zhao, Lili Lin, Bo Zhao, Hai-Yan Su, Qingjun Zhu, Wei-Xue Li, Ding Ma
Various carbonaceous species were controllably deposited on Co/Al2O3 catalysts using ethylene as carbon source during the activation process for Fischer-Tropsch synthesis (FTS). Atomic, polymeric and graphitic carbon were distinguished by Raman spectroscopy, thermoanalysis and temperature programmed hydrogenation. Significant changes occurred in both the catalytic activity and selectivity toward hydrocarbon products after ethylene treatment. The activity decreased along with an increase in CH4 selectivity, at the expense of a remarkable decrease of heavy hydrocarbon production, resulting in enhanced selectivity for the gasoline fraction...
April 28, 2017: Faraday Discussions
https://www.readbyqxmd.com/read/28182780/farnesylthiosalicylic-acid-sensitizes-hepatocarcinoma-cells-to-artemisinin-derivatives
#19
Liping Wu, Yilin Pang, Guiqi Qin, Gaina Xi, Shengnan Wu, Xiaoping Wang, Tongsheng Chen
Dihydroartemisinin (DHA) and artesunate (ARS), two artemisinin derivatives, have efficacious anticancer activities against human hepatocarcinoma (HCC) cells. This study aims to study the anticancer action of the combination treatment of DHA/ARS and farnesylthiosalicylic acid (FTS), a Ras inhibitor, in HCC cells (Huh-7 and HepG2 cell lines). FTS pretreatment significantly enhanced DHA/ARS-induced phosphatidylserine (PS) externalization, Bak/Bax activation, mitochondrial membrane depolarization, cytochrome c release, and caspase-8 and -9 activations, characteristics of the extrinsic and intrinsic apoptosis...
2017: PloS One
https://www.readbyqxmd.com/read/28170012/understanding-fts-selectivity-the-crucial-role-of-surface-hydrogen
#20
C J Weststrate, J W Niemantsverdriet
Monomeric forms of carbon play a central role in the synthesis of long chain hydrocarbons via the Fischer-Tropsch synthesis (FTS). We explored the chemistry of C1Hxad species on the close-packed surface of cobalt. Our findings on this simple model catalyst highlight the important role of surface hydrogen and vacant sites for product selectivity. We furthermore find that COad affects hydrogen in multiple ways. It limits the adsorption capacity for Had, lowers its adsorption energy and inhibits dissociative H2 adsorption...
April 28, 2017: Faraday Discussions
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