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Bow Tie

Esmaeil Zarei, Ali Azadeh, Nima Khakzad, Iraj Mohammadfam
Pipelines are one of the most popular and effective ways of transporting hazardous materials, especially natural gas. However, the rapid development of gas pipelines and stations in urban areas has introduced a serious threat to public safety and assets. Although different methods have been developed for risk analysis of gas transportation systems, a comprehensive methodology for risk analysis is still lacking, especially in natural gas stations. The present work is aimed at developing a dynamic and comprehensive quantitative risk analysis (DCQRA) approach for accident scenario and risk modeling of natural gas stations...
October 1, 2016: Journal of Hazardous Materials
Yong Hyun Kim, Hong Kwon, Jeongjun Kim, Kwang Yong Song
High-sensitivity distributed measurement of hydrostatic pressure is experimentally demonstrated by optical time-domain analysis of Brillouin dynamic grating (BDG) in polarization maintaining fibers (PMF's). The spectral shift of the BDG in four different types of PMF's are investigated under hydrostatic pressure variation from 14.5 psi (1 bar) to 884.7 psi (61 bar) with less than 2 m spatial resolution. The pressure sensitivity of BDG frequency is measured to be ‒1.69, + 0.65, + 0.78, and + 0.85 MHz/psi for a PM photonic crystal fiber (PM-PCF), two Bow-tie fibers, and a PANDA fiber, respectively, which is about 65 to 169 times larger than that of Brillouin frequency-based pressure sensing...
September 19, 2016: Optics Express
S Chegini, A De Leo, S Tucker
No abstract text is available yet for this article.
September 23, 2016: Annals of the Royal College of Surgeons of England
Jochen Wueppen, Sebastian Nyga, Bernd Jungbluth, Dieter Hoffmann
We report on an optical parametric oscillator that generates output idler wavelengths around 10.6 μm. On the basis of orientation-patterned gallium arsenide (OP-GaAs) as a nonlinear medium and a 1.95 μm ns-pulsed pump laser, a signal-resonant bow-tie resonator was designed in order to maximize the output power at moderate intensities well below the damage threshold of the optical components. With this setup, the average idler output power at 50 kHz and 100 ns idler pulse length was more than 800 mW, which corresponds to a pulse energy of 16 μJ...
September 15, 2016: Optics Letters
Lia Florim Patrão, Ana Laura Caiado Canedo, João Luiz Peixoto Braga de Azevedo, Rosane Correa, Renato Ambrósio
We report two cases of suspicious asymmetric bow tie and inferior steepening on topographic evaluations with reflection (Placido) and projection (Scheimpflug). Rotating Scheimpflug corneal and anterior segment tomography (Oculus Pentacam HR, Wetzlar, Germany)® was performed in the first case, with a maximal keratometric value (Kmax) of 43.2 D and an overall deviation value from the Belin/Ambrósio Enhanced Ectasia Display (BAD-D) of 1.76, which was observed in the study eye (OD). BAD-D was 6.59 in the fellow eye, which had clinical findings that were consistent with keratoconus stage 2...
July 2016: Arquivos Brasileiros de Oftalmologia
Zhong-Jian Yang, Tomasz J Antosiewicz, Timur Shegai
We investigate the role of material loss and mode volume of plasmonic nanostructures on strong plasmon-exciton coupling. We find that the field enhancement, and therefore loss, is not important for the magnitude of the Rabi splitting as such, but instead it is determined by the mode volume. Nevertheless, for reaching true strong coupling condition, that is, coupling greater than any dissipation, it is important to compromise losses. We also show that using such popular geometries as a dimer of two spheres or bow-tie nanoantennas, does not allow compressing the mode volume much in comparison to a single nanoparticle case, except for very narrow gaps, but rather it allows for efficient extraction of the mode out of the metal thus making it more accessible for excitons to interact with...
September 5, 2016: Optics Express
Naoki Yamamoto
A high-resolution cathodoluminescence (CL) system for scanning transmission electron microscope (STEM) has been developed by employing a field emission gun and a spherical aberration corrector, which realizes a probe size of 1 nm even at an accelerating voltage of 80 kV and beam current of the order of 1 nA. Angle resolved measurement of light emission from a sample in the STEM is possible by combining a parabolic mirror and position-controlled pinhole. CL spectra are successively acquired by a highly sensitive charge-coupled device while scanning the incident electron beam or pinhole, which enables various detection modes, i...
August 2016: Microscopy
Angelina Müller, Matthias C Wapler, Ulrich T Schwarz, Markus Reisacher, Katarzyna Holc, Oliver Ambacher, Ulrike Wallrabe
We study the spatial intensity distribution and the self-reconstruction of quasi-Bessel beams produced from refractive axicon lenses with edge emitting laser diodes as asymmetric and astigmatic illumination sources. Comparing these to a symmetric mono-mode fiber source, we find that the asymmetry results in a transition of a quasi-Bessel beam into a bow-tie shaped pattern and eventually to a line shaped profile at a larger distance along the optical axis. Furthermore, we analytically estimate and discuss the effects of astigmatism, substrate modes and non-perfect axicons...
July 25, 2016: Optics Express
Fang Yan, Kaili Xu, Xiwen Yao, Yang Li
Biomass gasification technology has been rapidly developed recently. But fire and poisoning accidents caused by gas leakage restrict the development and promotion of biomass gasification. Therefore, probabilistic safety assessment (PSA) is necessary for biomass gasification system. Subsequently, Bayesian network-bow-tie (BN-bow-tie) analysis was proposed by mapping bow-tie analysis into Bayesian network (BN). Causes of gas leakage and the accidents triggered by gas leakage can be obtained by bow-tie analysis, and BN was used to confirm the critical nodes of accidents by introducing corresponding three importance measures...
2016: PloS One
Tomonobu Haba, Shuji Koyama, Yutaka Kinomura, Yoshihiro Ida, Masanao Kobayashi
The American Association of Physicists in Medicine (AAPM) task group 204 has recommended the use of size-dependent conversion factors to calculate size-specific dose estimate (SSDE) values from volume computed tomography dose index (CTDIvol) values. However, these conversion factors do not consider the effects of 320-detector-row volume computed tomography (CT) examinations or the new CT dosimetry metrics proposed by AAPM task group 111. This study aims to investigate the influence of these examinations and metrics on the conversion factors reported by AAPM task group 204, using Monte Carlo simulations...
September 2016: Australasian Physical & Engineering Sciences in Medicine
Eric M Schmidt, Shalini Gupta, Thomas Bowe, Laura S Ellerbe, Tyler E Phelps, John W Finney, Steven M Asch, Keith Humphreys, Jodie Trafton, Megan Vanneman, Alex H S Harris
BACKGROUND: Measures of substance use disorder (SUD) treatment quality are essential tools for performance improvement. The Veterans Health Administration (VHA) developed a measure of access to and engagement in intensive outpatient programs (IOP) for SUD. However, predictive validity, or associations between this measure and treatment outcomes, has not been examined. METHODS: Data on veterans with SUD came from three samples: the Outcomes Monitoring Project (N = 5,436), a national evaluation of VHA mental health services (N = 339,887), and patients receiving detoxification services (N = 23,572)...
July 19, 2016: Substance Abuse
Tomonobu Haba, Shuji Koyama, Takahiko Aoyama, Yutaka Kinomura, Yoshihiro Ida, Masanao Kobayashi, Hiroshi Kameyama, Yoshinori Tsutsumi
PURPOSE: Patient dose estimation in X-ray computed tomography (CT) is generally performed by Monte Carlo simulation of photon interactions within anthropomorphic or cylindrical phantoms. An accurate Monte Carlo simulation requires an understanding of the effects of the bow-tie filter equipped in a CT scanner, i.e. the change of X-ray energy and air kerma along the fan-beam arc of the CT scanner. To measure the effective energy and air kerma distributions, we devised a pin-photodiode array utilizing eight channels of X-ray sensors arranged at regular intervals along the fan-beam arc of the CT scanner...
July 2016: Physica Medica: PM
Ali Mirzajani, Sattar Aghataheri, Mohammad Ghoreishi, Ebrahim Jafarzadepour, Mohadese Mohammadinia
PURPOSE: This study reports the characteristics of corneal higher order aberrations (HOAs) in eyes with normal topographic pattern using the Pentacam scheimpflug system. METHODS: In this prospective, observational, comparative study, 165 eyes of 97 patients separated into five groups based on corneal topographic patterns were enrolled. All eyes received a comprehensive ophthalmologic examination including corneal tomographic analysis with the Pentacam system. Keratometry, corneal cylinder, and corneal aberrometric data were recorded and analyzed...
June 2016: Journal of Current Ophthalmology
Annie Janvier
No abstract text is available yet for this article.
August 1, 2016: JAMA Pediatrics
Zhaleh Abdi, Hamid Ravaghi, Mohsen Abbasi, Bahram Delgoshaei, Somayeh Esfandiari
Purpose - The purpose of this paper is to apply Bow-tie methodology, a proactive risk assessment technique based on systemic approach, for prospective analysis of the risks threatening patient safety in intensive care unit (ICU). Design/methodology/approach - Bow-tie methodology was used to manage clinical risks threatening patient safety by a multidisciplinary team in the ICU. The Bow-tie analysis was conducted on incidents related to high-alert medications, ventilator associated pneumonia, catheter-related blood stream infection, urinary tract infection, and unwanted extubation...
May 9, 2016: International Journal of Health Care Quality Assurance
Assim Boukhayma, Antoine Dupret, Jean-Pierre Rostaing, Christian Enz
This paper presents the first low noise complementary metal oxide semiconductor (CMOS) deletedCMOS terahertz (THz) imager based on source modulation and in-pixel high-Q filtering. The 31 × 31 focal plane array has been fully integrated in a 0 . 13 μ m standard CMOS process. The sensitivity has been improved significantly by modulating the active THz source that lights the scene and performing on-chip high-Q filtering. Each pixel encompass a broadband bow tie antenna coupled to an N-type metal-oxide-semiconductor (NMOS) detector that shifts the THz radiation, a low noise adjustable gain amplifier and a high-Q filter centered at the modulation frequency...
2016: Sensors
Jaisri Jagannadham, Hitesh Kumar Jaiswal, Stuti Agrawal, Kamal Rawal
Obesity is a global epidemic affecting over 1.5 billion people and is one of the risk factors for several diseases such as type 2 diabetes mellitus and hypertension. We have constructed a comprehensive map of the molecules reported to be implicated in obesity. A deep curation strategy was complemented by a novel semi-automated text mining system in order to screen 1,000 full-length research articles and over 90,000 abstracts that are relevant to obesity. We obtain a scale free network of 804 nodes and 971 edges, composed of 510 proteins, 115 genes, 62 complexes, 23 RNA molecules, 83 simple molecules, 3 phenotype and 3 drugs in "bow-tie" architecture...
2016: PloS One
Dingjie Wang, Suoqin Jin, Xiufen Zou
The control of complex networks is one of the most challenging problems in the fields of biology and engineering. In this study, the authors explored the controllability and control energy of several signalling networks, which consisted of many interconnected pathways, including networks with a bow-tie architecture. On the basis of the theory of structure controllability, they revealed that biological mechanisms, such as cross-pathway interactions, compartmentalisation and so on make the networks easier to fully control...
February 2016: IET Systems Biology
John D Lantos
The dust-jacket photo of Eric Cassell portrays him as a magician. He wears a dark suit, a bow tie, and big dark-rimmed glasses. His head is tilted down; his forehead is massive; his eyes are intense. It is an interrogating look that is crucial to the central theme of his most recent books, The Nature of Healing: The Modern Practice of Healing and The Nature of Clinical Medicine: The Return of the Clinician.
January 2016: Hastings Center Report
Meghan A Campbell
Tied up with a (rain)bow: Looking ahead to 2016, important changes are underway at ChemBioChem. The elimination of color charges and accelerated publication times keep ChemBioChem at the forefront of chemical biology. We also enjoy a look back at the highlights of 2015 and upcoming changes to the editorial office and board.
January 1, 2016: Chembiochem: a European Journal of Chemical Biology
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