Search Results
Results 1 - 50 of 1523
1 2 3 4 5 6 7 8 9 10 >
Cebral Juan R JR Center for Computational Fluid Dynamics, College of Sciences, George Mason University, 4400 University Drive, MSN 6A2, Fairfax, VA, 22030, - - 2014
Understanding the flow alteration in side branches during flow diversion treatment of cerebral aneurysms is important to prevent ischemic complications and improve device designs. Flow diverters were placed in the aorta of four rabbits crossing the origin of side arteries. Subject-specific computational models were constructed from 3D angiographies and Doppler ...
García-Medina J J Sección de Radiología Vascular, Servicio de Radiología, Hospital General Universitario Reina Sofía, Murcia, España. Electronic address: - - 2014
To analyze the values of flow obtained with an endovascular catheter, and to determine whether they are more reliable than angiographic and clinical findings for planning and for determining the outcome of invasive radiologic treatment of hemodialysis fistulas, as well as to determine the safety of this technique during interventional ...
Gayda Mathieu M Cardiovascular Prevention and Rehabilitation Centre (ÉPIC), Montreal Heart Institute and "Université de Montréal", Montreal, Qc, Canada Research Center, Montreal Heart Institute and "Université de Montréal", Montreal, Quebec, Canada Department of Medicine, Faculty of Medicine, "Université de Montréal", Montreal, - - 2014
This study aims were: 1) to assess forearm blood flow (FBF) and muscle oxygen consumption (mVO2) repeatability assessed with near-infra red spectroscopy (NIRS) during venous occlusions (VO) in middle aged healthy subjects and patients with stable coronary heart disease (CHD), 2) to assess the agreement between mVO2 calculated from NIRS ...
Li Bing - - 2014
Video retargeting is a useful technique to adapt a video to a desired display resolution. It aims to preserve the information contained in the original video and the shapes of salient objects while maintaining the temporal coherence of contents in the video. Existing video retargeting schemes achieve temporal coherence via ...
Lindner Markus M Klinik und Poliklinik für Innere Medizin B, Universitätsmedizin Greifswald, Ernst-Moritz-Arndt-Universität Greifswald, Ferdinand-Sauerbruch-Str, 17485 Greifswald, Germany. - - 2014
Currently, many methods for quantitation of coronary collateral function are based on intracoronary pressure measurements distal of an occluded balloon, which do not fully account for the dynamic nature of collateral flow. Therefore, a flow-based parameter of coronary collateral function based upon principles of thermodilution was evaluated. In 26 patients ...
Abel Guy J GJ Wittgenstein Centre for Demography and Global Human Capital (IIASA, VID/ÖAW, WU), Vienna Institute of Demography (Austrian Academy of Sciences), Wohllebengasse 12-14, Vienna, 1040, - - 2014
Widely available data on the number of people living outside of their country of birth do not adequately capture contemporary intensities and patterns of global migration flows. We present data on bilateral flows between 196 countries from 1990 through 2010 that provide a comprehensive view of international migration flows. Our ...
Warboys Christina M CM From the British Heart Foundation Cardiovascular Science Unit, National Heart and Lung Institute (C.M.W., A.d.L., NA., R.K., W.-M.C., J.C.M., D.O.H.), Department of Aeronautics (S.J.S.), and MRC Clinical Sciences Centre (J.G.), Imperial College London, London, United Kingdom; Departments of Cardiovascular Science (L.L., H.D., S.H., S.B., P.C.E.) and Materials Science and Engineering (A.W., C.K.C.) and Insigneo Institute of In Silico Medicine (P.C.E.), University of Sheffield, Sheffield, United Kingdom; and Division of Cardiovascular Medicine, University of Cambridge, Cambridge, United Kingdom - - 2014
Although atherosclerosis is associated with systemic risk factors such as age, high cholesterol, and obesity, plaque formation occurs predominately at branches and bends that are exposed to disturbed patterns of blood flow. The molecular mechanisms that link disturbed flow-generated mechanical forces with arterial injury are uncertain. To illuminate them, we ...
Kadbi Mo M Electrical and Computer Engineering Department, University of Louisville, Louisville, Kentucky, - - 2014
Inaccuracy of conventional four-dimensional (4D) flow MR imaging in the presence of random unsteady and turbulent blood flow distal to a narrowing has been an important challenge. Previous investigations have revealed that shorter echo times (TE) decrease the errors, leading to more accurate flow assessments. In this study, as part ...
Krishnaiah Yellela S R YS Division of Product Quality Research, Office of Testing and Research, Office of Pharmaceutical Science, Center for Drug Evaluation and Research, Food and Drug Administration, Silver Spring, Maryland, - - 2014
Cold flow is a phenomenon occurring in drug-in-adhesive type of transdermal drug delivery systems (DIA-TDDS) because of the migration of DIA coat beyond the edge. Excessive cold flow can affect their therapeutic effectiveness, make removal of DIA-TDDS difficult from the pouch, and potentially decrease available dose if any drug remains ...
Calkoen Emmeline E EE Departments of *Paediatric Cardiology †Radiology, Leiden University Medical Center, Leiden, The - - 2014
Acquisition techniques related to 4-dimensional (4D) flow magnetic resonance imaging (MRI) improved rapidly over the last 3 decades. Most importantly, a major improvement was the acceleration of the acquisition, which resulted in a clinically feasible scan duration and led to more comprehensive use of 4D flow MRI in clinical research. ...
Pitt Hannah H Department of Health and Social Sciences University of the West of England Glenside Campus Blackberry Hill Stapleton Bristol BS16 1DD, UK. Electronic address: - - 2014
This paper develops the concept of therapeutic place experiences by considering the role of activity. Research of community gardening finds that particular tasks are therapeutic and exhibit the characteristics of flow, but those who lack influence over their community gardening are less likely to benefit from flow as their sense ...
Wang Da D Department of Radiological Sciences, David Geffen School of Medicine, University of California, Los Angeles, Los Angeles, California, USA; Biomedical Physics Interdepartmental Graduate Program, University of California, Los Angeles, Los Angeles, California, - - 2014
To develop and evaluate a technique for accelerating phase contrast MRI (PC-MRI) acquisitions without significant compromise in flow quantification accuracy. PC-MRI is commonly acquired using interleaved flow-compensated (FC) and flow-encoded (FE) echoes. We hypothesized that FC data, which represent background phase, do not change significantly over time. Therefore, we proposed ...
Ichikawa Yasutaka Y Department of Radiology, Matsusaka Central Hospital, 102 Kobou, Kawai, Matsusaka, Mie, 515-8566, Japan, - - 2014
Endothelial dysfunction is a key element in early atherogenesis. The purposes of this study were to evaluate the feasibility of magnetic resonance (MR) assessment of altered myocardial blood flow (MBF) in response to the cold pressor test (CPT) and to determine if coronary endothelial dysfunction in young smokers can be ...
Su Boyang B Research and Development Unit, National Heart Centre Singapore, 17 third hospital avenue, Mistri Wing, Singapore 168752, - - 2014
Coronary heart disease causes obstruction of coronary blood flow and is the leading cause of death worldwide. The effect of focal stenosis on downstream flow pattern in the coronary arterial tree is not well understood. Here, the blood flows in normal and diseased porcine left anterior descending (LAD) arterial tree ...
Debus Maike E - - 2014
This article examines variations of work-related flow both between and within days. On the basis of the effort-recovery model (Meijman & Mulder, 1998), we hypothesized that a person's relative day-specific state of being recovered (i.e., feeling refreshed) in the morning is positively related to subsequent day-level flow experiences during work. ...
Yamashiro Sawako S Laboratory of Single-Molecule Cell Biology, Tohoku University Graduate School of Life Sciences, Sendai, Miyagi, Japan Department of Physics, Lehigh University, Bethlehem, PA, - - 2014
Speckle microscopy directly visualizes the retrograde actin flow, which is believed to promote cell edge protrusion when linked to focal adhesions (FAs). However, it has been argued that due to rapid actin turnover, the use of GFP-actin, the lack of appropriate analysis algorithms and technical difficulties, speckle microscopy does not ...
Parry Dave D School of Biological Sciences, University of Essex, Wivenhoe Park,Colchester, United - - 2014
To examine the effect of variations in optic flow on perceived and actual running pace, and perceived exertion (RPE). Twelve male moderately trained competitive runners performed a self-paced 5 km running reference time-trial followed by three 5 km running self-paced trials under different optic flow conditions (RNORM = actual running ...
Xiao Shuhai S Department of Geosciences, Virginia Polytechnic Institute and State University, Blacksburg, VA 24061, USA. Electronic address: - - 2014
Some of the enigmatic Precambrian organisms in the Ediacaran Period grew large and stood tall above the seafloor. Canopy flow modeling suggests that their large size was optimized for access to flow in order to facilitate osmotrophic nutrient uptake in low-flow environments.
Palardy James E - - 2014
Many terrestrial and marine systems are open to immigration. As such, the delivery of reproductive propagules should play a substantial role in determining local diversity in many systems. Here we present the results of a two-year experimental manipulation of subtidal flow regimes and show that flow has a strong positive ...
Armstrong Ian S IS Nuclear Medicine, Central Manchester University Hospitals, Oxford Road, Manchester, UK, - - 2014
Myocardial flow reserve (MFR) obtained from dynamic cardiac positron emission tomography (PET) with rubidium-82 (Rb-82) has been shown to be a useful measurement in assessing coronary artery disease. Advanced PET reconstructions with point spread function modeling and time-of-flight have been shown to improve image quality but also have an impact ...
Bahloul Ali A a Chemical and Biological Hazards Prevention, Research and Expertise Division, IRSST , Montreal , - - 2014
ABSTRACT An increasing demand for protecting workers against harmful inhalable ultrafine particles (UFPs), by means of filtering facepiece respirators (FFRs), necessitates assessing the efficiency of FFRs. This paper evaluates the penetration of particles, mostly in the ultrafine range, through one model of N95 FFR exposed to cyclic and constant flows, ...
Finkelstein Ariel A Departments of Cardiology, Tel Aviv Sourasky Medical Center, Tel Aviv, Affiliated to the Sackler School of Medicine, Tel Aviv University, Tel Aviv, - - 2014
The phenomenon of slow coronary flow (SCF) in the presence of normal coronary arteries may indicate endothelial dysfunction, which is characteristic of an early stage in the development of atherosclerosis. Measurement of the Carotid Intima-Media Thickness (CIMT) allows identification of early stages of atherosclerosis. CIMT might offer a non-invasive method ...
Nansai Keisuke - - 2014
This study, encompassing 231 countries and regions, quantifies the global transfer of three critical metals (neodymium, cobalt and platinum) considered vital for low-carbon technologies by means of material flow analysis (MFA), using trade data (BACI) and the metal contents of trade commodities, resolving the optimization problem to ensure the material ...
Bernad Sandor I - - 2014
The long-term success of arterial bypass surgery is often limited by the progression of intimal hyperplasia at the anastomosis between the graft and the native artery. The experimental models were manufactured from glass tubing with constant internal diameter of 8 mm, fashioned into a straight configuration and helical configuration. The ...
Krause Daniela S DS Department of Pathology, Massachusetts General Hospital, Boston, MA, - - 2014
Within the last 25 years, flow cytometry and fluorescence-activated cell sorting have emerged as both routine diagnostic tools in clinical medicine and as advanced analytic tools critical in performing scientific research. This chapter aims at summarizing the use of flow cytometry in benign and malignant hematology and the monitoring of ...
Tauro Flavia F Department of Mechanical and Aerospace Engineering, New York University Polytechnic School of Engineering, Brooklyn, New York, United States of America; Dipartimento di Ingegneria Civile, Edile e Ambientale, Sapienza University of Rome, Rome, - - 2014
From climatology to biofluidics, the characterization of complex flows relies on computationally expensive kinematic and kinetic measurements. In addition, such big data are difficult to handle in real time, thereby hampering advancements in the area of flow control and distributed sensing. Here, we propose a novel framework for unsupervised characterization ...
Bino Gilad - - 2014
Global wetland biodiversity loss continues unabated, driven by increased demand for freshwater. A key strategy for conservation management of freshwater systems is to maintain the quantity and quality of the natural water regimes, including the frequency and timing of flows. Formalizing an ecological model depicting the key ecological components and ...
Chester Edwin T ET Environmental and Conservation Sciences, Murdoch University, Perth, Western Australia, - - 2014
In dry climate zones, headwater streams are often regulated for water extraction causing intermittency in perennial streams and prolonged drying in intermittent streams. Regulation thereby reduces aquatic habitat downstream of weirs that also form barriers to migration by stream fauna. Environmental flow releases may restore streamflow in rivers, but are ...
Perez-Aguilar Sandra S Facultad de Medicina, - - 2013
Blood flow acts parallel to the coronary luminal endothelial surface layer (LESL) and modulates multiple parenchymal functions via the release of paracrine agents. Evidence indicates that the LESL may be a flow sensing organelle and that perhaps through flow-induced lectin (L) oligosaccharide (O) complex formation (LO) participates in this process. ...
Kato Shingo - - 2013
Long-term intake of long-chain n-3 polyunsaturated fatty acids (n-3 PUFAs), especially eicosapentaenoic acid (EPA) is associated with a low risk for cardiovascular disease. Phase-contrast cine cardiovascular magnetic resonance (PC cine CMR) can assess coronary flow reserve (CFR). The present study investigates the relationship between CFR evaluated by PC cine CMR ...
Moriguchi Takeshi T Department of Surgery, Yale University School of Medicine, New Haven, West Haven, Conn; the Veterans Administration Connecticut, West Haven, - - 2013
We analyzed the relationship between platelet endothelial cell adhesion molecule-1 (PECAM-1) activation and tissue factor (TF) RNA expression in human umbilical vein endothelial cells (HUVECs) exposed to mechanical and chemical stimulation. Fifty percent confluent and 100% confluent HUVEC cultures were exposed to pulsatile forward flow, as a model for uniform ...
Kaya Ahmet A Department of Cardiology, Faculty of Medicine, Ordu University, Ordu-Turkey. - - 2013
We aimed to investigate the relationship between ABO blood groups and complexity of coronary lesions assessed by SYNTAX score (SS) in stable coronary artery disease (CAD) patients. Our cross-sectional and observational study population consisted of 559 stable CAD patients. From all patients, ABO blood group was determined and the SS ...
Hartmann Leo A LA Instituto de Geociencias, Universidade Federal do Rio Grande do Sul, Porto Alegre, RS, - - 2014
The Entre Rios mining district produces a large volume of amethyst geodes in underground mines and is part of the world class deposits in the Paraná volcanic province of South America. Two producing basalt flows are numbered 4 and 5 in the lava stratigraphy. A total of seven basalt flows ...
Arbel Yaron Y Department of Cardiology, Tel Aviv Medical Center, Affiliated to the Sackler School of Medicine, Tel Aviv University, Tel Aviv, Israel. Electronic address: - - 2014
The "Slow Coronary Flow" (SCF) phenomenon in the presence of angiographically normal coronaries is attributed to microvascular and endothelial dysfunction. The microcirculation can be non-invasively assessed by measuring retinal blood flow velocity. The aim of the present study was to evaluate the efficacy of the "Retinal Functional Imager" (RFI) device ...
Radu Maria D - - 2013
Aims: Angiographic ectasias and aneurysms in stented segments have been associated with late stent thrombosis. Using optical coherence tomography (OCT), some stented segments show coronary evaginations reminiscent of ectasias. The purpose of this study was to explore, using computational fluid-dynamic (CFD) simulations, whether OCT-detected coronary evaginations can induce local changes ...
Ha Hojin - - 2013
Blood flow in an artery is closely related to atherosclerosis progression. Hemodynamic environments influence platelet activation, aggregation, and rupture of atherosclerotic plaque. The existence of swirling flow components in an artery is frequently observed under in vivo conditions. However, the fluid-dynamic roles of spiral flow are not fully understood to ...
Bourquelot Pierre - - 2013
Use of the Amplatzer vascular plug (AVP; St. Jude Medical Inc, St. Paul, Minn) for percutaneous occlusion of a hemodialysis arteriovenous access (AVA) is an emerging practice, and only a few reports by radiologists have been published. We report here a multidisciplinary experience of this technique not only for AVA ...
Tuffen Hugh - - 2013
The emplacement mechanisms of rhyolitic lava flows are enigmatic and, despite high lava viscosities and low inferred effusion rates, can result in remarkably, laterally extensive (>30 km) flow fields. Here we present the first observations of an active, extensive rhyolitic lava flow field from the 2011-2012 eruption at Cordón Caulle, Chile. ...
Jelenc Matija - - 2013
Low mean bypass graft flow (Q) and high pulsatility index (PI) measured by the transit time flow measurement method are not specific for anastomotic stenosis, but occur with competitive flow and poor coronary run-off. We hypothesized that graft compliance is responsible for these changes and that flow measured at the ...
Bartoli Carlo R - - 2013
Counterpulsation with an intra-aortic balloon pump (IABP) has not achieved the same success or clinical use in pediatric patients as in adults. In a pediatric animal model, IABP efficacy was investigated to determine whether IABP timing with a high-fidelity blood pressure signal may improve counterpulsation therapy versus a low-fidelity signal. ...
Huang Wenbin - - 2013
Three-dimensional graphene foam (GF) is synthesized by CVD. When water flows through GF, electricity is induced. The direction of the induced current is dominated by the flow direction of water; the value of induced current is related to the flow velocity but has no relationship with the flow direction and ...
Frölich Andreas M J - - 2013
In acute stroke patients with large vessel occlusion, collateral blood flow affects tissue fate and patient outcome. The visibility of collaterals on computed tomography angiography (CTA) strongly depends on the acquisition phase, but the optimal time point for collateral imaging is unknown. We analysed collaterals in a time-resolved fashion using ...
Ravi Sridhar - - 2013
Our understanding of how variable wind in natural environments affects flying insects is limited, because most studies of insect flight are conducted in either smooth flow or still air conditions. Here, we investigate the effects of structured, unsteady flow (the von Karman vortex street behind a cylinder) on the flight ...
Markl Michael - - 2013
Complex hemodynamics in cerebral arteriovenous malformations (AVM) are thought to play a key role in their pathophysiology. We applied 4D flow magnetic resonance imaging (MRI) for the detailed evaluation of AVM function at baseline and to investigate the impact of staged embolization on AVM hemodynamics in a patient with a ...
Iida Kenji - - 2013
The purpose of this study was to examine the mental health effects of Tai chi on regular practitioners by investigating the relationships between flow experience, IKIGAI (Japanese: "Life worth living"), and sense of coherence. The results indicated that flow experience may influence IKIGAI and IKIGAI may influence sense of coherence; ...
Yu Yang - - 2013
Intraoperative transit time flow measurement (TTFM) is widely used to assess anastomotic quality in coronary artery bypass grafting (CABG). However, in sequential vein grafting, the flow characteristics collected by the conventional TTFM method are usually associated with total graft flow and might not accurately indicate the quality of every distal ...
Luttman Aaron - - 2013
Given image data of a fluid flow, the flow field, ⟨u,v⟩, governing the evolution of the system can be estimated using a variational approach to optical flow. Assuming that the flow field governing the advection is the symplectic gradient of a stream function or the gradient of a potential function-both ...
Grogan J A - - 2013
In order to better understand the in vivo corrosion of biodegradable alloys, it is necessary to replicate the physiological environment as closely as possible. In this study, a novel flow chamber system is developed that allows the investigation of biodegradable alloy corrosion in a simulated physiological environment. The system is ...
Wu Jian - - 2013
Using high-frequency color and pulsed Doppler ultrasound, we evaluated the flow patterns of the left (LCA), septal (SCA) and right (RCA) coronary arteries in mice with and without transverse aortic constriction (TAC). Fifty-two male C57BL/6J mice were subjected to TAC or a corresponding sham operation. At 2 and 8 wk post-surgery, ...
Chen Ying - - 2013
Indium Arsenide (InAs) nanowire (NW) field effect transistors (FETs) were incorporated into a microfluidic channel to detect the flow rate change as well as to harvest fluid flow energy for electric power generation. Discrete changes in the electric current through InAs NWFETs were observed upon flow rate changes at steps ...
1 2 3 4 5 6 7 8 9 10 >