Search results for "COPI"
showing 10 items of 2618 documents
Virtual Reality Simulator Training of Laparoscopic Cholecystectomies — A Systematic Review
2012
Background and Aims: Simulators are widely used in occupations where practice in authentic environments would involve high human or economic risks. Surgical procedures can be simulated by increasingly complex and expensive techniques. This review gives an update on computer-based virtual reality (VR) simulators in training for laparoscopic cholecystectomies. Materials and Methods: From leading databases (Medline, Cochrane, Embase), randomised or controlled trials and the latest systematic reviews were systematically searched and reviewed. Twelve randomised trials involving simulators were identified and analysed, as well as four controlled studies. Furthermore, seven studies comparing black…
Effects of functional endoscopic sinus surgery on the acoustics of the sinonasal tract
2017
Background: Nasal and paranasal cavities are supposed to contribute substantially to the vocal tract resonator properties. However, their acoustical effects as well as the effects of sinus surgery on the voice remain unclear. In this work we investigate resonance phenomena of paranasal sinuses prior to and after various rhinosurgical procedures in cadaveric human sinonasal tracts and corresponding 3D casts. Methodology: Nasal and paranasal cavities of formalin-preserved cadavers and corresponding 3D replicas were excited by sine tone sweeps from an earphone placed in the epipharynx.The response was picked up by a microphone at the nostrils. Different FESS procedures were performed and the a…
Anti-inflammatory Function of High-Density Lipoproteins via Autophagy of IκB Kinase
2015
Background & Aims: Plasma levels of high-density lipoprotein (HDL) cholesterol are frequently found decreased in patients with inflammatory bowel disease (IBD). Therefore, and because HDL exerts anti-inflammatory activities, we investigated whether HDL and its major protein component apolipoprotein A-I (apoA-I) modulate mucosal inflammatory responses in vitro and in vivo. Methods: The human intestinal epithelial cell line T84 was used as the in vitro model for measuring the effects of HDL on the expression and secretion of tumor necrosis factor (TNF), interleukin-8 (IL-8), and intracellular adhesion molecule (ICAM). Nuclear factor-κB (NF-κB)-responsive promoter activity was studied by …
Integrated plasmonic waveguides: A mode solver based on density of states formulation
2009
International audience; We express the density of states (DOS) near guided resonances of plasmonic waveguides by using multiple-scattering theory. In direct analogy with the case of localized electronic defect states in condensed matter, we demonstrate that optical DOS variations follow a lorentzian profile near guided modes resonances. The lorentzian shape gives quantitative information on the guided modes (effective index, propagation length, and polarization state). We numerically investigate both leaky and bound (lossy) modes supported by dielectric-loaded surface-plasmon-polariton waveguides.
Quantum wire with periodic serial structure
1991
Electron wave motion in a quantum wire with periodic structure is treated by direct solution of the Schr\"odinger equation as a mode-matching problem. Our method is particularly useful for a wire consisting of several distinct units, where the total transfer matrix for wave propagation is just the product of those for its basic units. It is generally applicable to any linearly connected serial device, and it can be implemented on a small computer. The one-dimensional mesoscopic crystal recently considered by Ulloa, Casta\~no, and Kirczenow [Phys. Rev. B 41, 12 350 (1990)] is discussed with our method, and is shown to be a strictly one-dimensional problem. Electron motion in the multiple-stu…
Well-being of physicians who work in oncology unit and in BMT unit: analysis of protective factors from work stress
2012
Background. Recently a great deal of attention has been given on doctors' work related stress and possibility of improving their quality of life. Several studies report that oncologists are overloaded psychologically. Contact with serious diseases, excessive working pressure, structural weaknesses, are some of the factors that predispose oncologists to stress. In 2008, at the ASPHO annual meeting, pediatric hematologists/oncologists noted burnout (considered as a result of protracted stress at work) was a significant challenge in their lives. To date, no studies have extensively ruled out on protective factors from work stress among pediatric oncologists. Aims. Our research investigates the…
Manipulation of nanoparticles of different shapes inside a scanning electron microscope
2014
In this work polyhedron-like gold and sphere-like silver nanoparticles (NPs) were manipulated on an oxidized Si substrate to study the dependence of the static friction and the contact area on the particle geometry. Measurements were performed inside a scanning electron microscope (SEM) that was equipped with a high-precision XYZ-nanomanipulator. To register the occurring forces a quartz tuning fork (QTF) with a glued sharp probe was used. Contact areas and static friction forces were calculated by using different models and compared with the experimentally measured force. The effect of NP morphology on the nanoscale friction is discussed.
Factors Contributing to Different Agency in Work and Study
2013
Most young adults today are following longer educational tracks and postpone entrance into the workforce. This 2-year study aimed to determine factors contributing to occupational self-efficacy in a representative sample of n = 1,891 young adults ( M = 23.92, SD = 2.17 years) with different work statuses (studying, in an apprenticeship, employed, or unemployed). Occupational identity, perceived work quality, the ability to cope with work stress, and symptomatology were assessed. Path analyses revealed that work status was the most important predictor of later occupational self-efficacy, with employment showing the strongest prediction of later agency in the professional domain. Ruminative e…
Work related stress and well-being: the roles of direct action coping and palliative coping
2006
The purpose of the present study is to analyze the roles of direct action coping and palliative coping in the relationship between work stressors and psychological well-being, as well as their possible interactions, in a sample of 464 bank employees. Hierarchical regression analyses showed main effects of direct action coping on well-being. Palliative coping predicts higher levels of psychological distress. Contrary to what was expected, the interactions between work stressors and direct action coping were not significant. Palliative coping interacted with work stressors when predicting psychosomatic complaints. The interaction between the two types of coping was significant on psychosomati…
WELL-BEING, SOURCES OF STRESS AND COPING STRATEGIES IN A SAMPLE OF ONCOLOGISTS
2010
Background: Several studies have highlighted that some professional categories, called: ‘helping professions’, appear, more than other professions, to be subjected to sources of stress and the connected risks of burn-out. In particular personnel working in oncology face potentially stressful situations and having to deal daily with the needs and concerns of the patients and their families. It is therefore necessary to understand the variables that can limit the impact of stress. This research seeks to explore the degree of personal well-being of the oncologists interviewed, taking into consideration some possible predictors, such as the age and specific trainings (i.e. in diagnosis communic…