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Search Results: 1 - 10 of 23556 matches for " Paul Bigeleisen "
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A New Biplane Ultrasound Probe for Real-Time Visualization and Cannulation of the Internal Jugular Vein
Jeremy Kaplowitz,Paul Bigeleisen
Case Reports in Anesthesiology , 2014, DOI: 10.1155/2014/349797
Abstract: Ultrasound guidance is recommended for cannulation of the internal jugular vein. Use of ultrasound allows you to identify relevant anatomy and possible anatomical anomalies. The most common approach is performed while visualizing the vein transversely and inserting the needle out of plane to the probe. With this approach needle tip visualization may be difficult. We report the use of a new biplane ultrasound probe which allows the user to simultaneously view the internal jugular vein in transverse and longitudinal views in real time. Use of this probe enhances needle visualization during venous cannulation. 1. Introduction Ultrasound (US) guidance is recommended for cannulation of the internal jugular vein (IJ) [1–3]. A recent meta-analysis found that US guided central venous access may lead to decreased risks of hematoma, arterial puncture, or pneumothorax [4]. Use of US in real time allows you to identify the relevant anatomy and any possible anatomical anomalies and visualize the path of your needle. US guided central venous access is primarily performed while visualizing the vein transversely and inserting the needle out of plane to the US probe. One major limitation of this approach is that visualization of the needle tip can be difficult. Failure to visualize your needle tip can lead to inadvertent arterial puncture or pneumothorax. We report the use of a new dual plane 4–10 megahertz US probe (BK 8824, BK Medical USA; Peabody, MA) which allows the user to simultaneously view the carotid artery (CA) and IJ in transverse and longitudinal views in real time (Figure 1). This provides the user with the familiar transverse view while being able to more clearly visualize your needle in the longitudinal view. Figure 1: A pictorial depiction of the BK 8824 US probe showing the configuration of the transverse and longitudinal transducers. T: transverse transducers; L: longitudinal transducer. 2. Case Presentation After positive initial experiences using this probe with a phantom (Blue Phantom, CAE Healthcare Sarasota, FL; Figure 2), we were able to cannulate the right IJ in a patient requiring central venous cannulation for surgery. Figure 2: Images from our use in a Blue Phantom training phantom with an 18 gauge 40 millimeter VascularSono cannula (Pajunk USA, Norcross, GA). This is the ideal view that can be obtained with this probe. You can clearly see the needle entering the simulated vein in both views, and the tip is clearly in the lumen in the longitudinal view. V: simulated vein. A 60-year-old, 78?kg, female with a past medical history significant
Identification of Nerves in Ultrasound Scans Using a Modified Mumford-Shah Functional and Prior Information
Jung-Ha An,Paul Bigeleisen,Steven Damelin
Lecture Notes in Engineering and Computer Science , 2011,
Abstract:
A Model for the Quantization of the Hall Resistance in the Quantum Hall Effect  [PDF]
Paul Bracken
Journal of Modern Physics (JMP) , 2010, DOI: 10.4236/jmp.2010.13023
Abstract: Some aspects of anyon physics are reviewed with the intention of establishing a model for the quantization of the Hall conductance. A single particle Schrödinger model is introduced and coupled with a constraint equation formulated from the anyon picture. The Schrödinger equation-constraint system can be converted to a single nonlinear differential equation and solutions for the model can be produced.
Exposure to Oil during Meiosis Results in Alterations in Meiotic Chromosomes that are Similar to Age-Related Changes in the Nematode Caenorhabditis elegans  [PDF]
Paul Goldstein
Journal of Environmental Protection (JEP) , 2010, DOI: 10.4236/jep.2010.13027
Abstract: Exposure of young C. elegans nematodes to three different concentrations of oil resulted in changes in the meiotic chromosomes, nucleus, nucleolus, and nuclear envelope associations. Such alterations decreased the viability and fertility of this organism which was used as a biological model. The morphological changes in the “young” group were similar to nematodes that were senescent and post-reproductive. Comparison of meiotic chromosomes at the pachytene stage of meiosis from young, old, and oil-exposed wild-type hermaphrodites were made following three-dimensional electron microscopy reconstruction of serial ultrathin sections. Age-related and oil-exposure related changes included: 1) Induced condensation of chromatin with increased variance in length of chromosomes; 2) Changes in nuclear and nucleolar volume; 3) Increased density of the nucleoplasm; and 4) Absence of Disjunction Regulator Regions, resulting in the loss of control of the segregation of the X-chromosome into gametes during meiosis. Abnormal clustering of the telomeric ends of the chromosomes was present on the nuclear envelope affecting the segregation of the chromosomes during meiosis.
The Processing of Pictures and Written Words: A Perceptual and Conceptual Perspective  [PDF]
Paul Miller
Psychology (PSYCH) , 2011, DOI: 10.4236/psych.2011.27109
Abstract: The present study examines similarities and differences in the processing of drawings and their corresponding names. For this purpose, students were asked to determine as fast as possible the identicalness of two pictures as opposed to the identicalness of their written Hebrew names. Twenty-eight Hebrew native speakers from the fifth grade participated in the experiment. Findings suggest that the human information processing system optimizes the processing of information (words, drawings, etc.) according to specific task requirements or task constraints. Stimulus type per se does not seem to determine the depth of its processing, nor does it seem to directly trigger particular modalities of encoding (perceptual, linguistic, semantic). Finally, the findings warrant the conclusion that superiority effects related to the processing of written words and pictorial stimuli reflect artifacts of task requirements rather than inherent characteristics of stimuli.
Are Sunspots Stabilizing?  [PDF]
Paul Shea
Theoretical Economics Letters (TEL) , 2011, DOI: 10.4236/tel.2011.13023
Abstract: The reduced form solutions of indeterminate rational expectations models often include extraneous expectational errors or “sunspots”. Sunspots are usually modeled as independent of the model’s fundamentals, and are often presumed to result in excess volatility. An alternate approach, however, is to assume that sunspots include both an overreaction or underreaction to fundamentals, as well as genuine extraneous noise. This paper uses a simple linear model to formally show how the relationship between sunspots and fundamentals affects aggregate volatility. Sunspots reduce volatility if 1) they include an undereaction to fundamentals, 2) the variance of genuine extraneous noise is sufficiently small, and 3) the root that causes indeterminacy is sufficiently far from one.
Why the Speed of Light Is Not a Constant  [PDF]
Paul Smeulders
Journal of Modern Physics (JMP) , 2012, DOI: 10.4236/jmp.2012.34047
Abstract: A variable Speed of Light is supported by the fact that all direct measurements of that speed are basically flawed, because the “meter per second” is proportional to the Speed of Light. Since it is impossible to measure the Speed of Light directly, any variations of it can only be obtained in an indirect way. It will be shown that the recent Supernovae data are in very good agreement with a universe that is slowly expanding exponentially with a Speed of Light that falls over time, inversely proportionally to the expansion of the universe. It will be shown that the definition of the angular and standard impulse momentum has to be modified to get a consistent expansion of the universe. And that all clocks run inversely proportionally to the red-shift z + 1. General Relativity remains valid even with a varying Speed of Light and also Quantum Mechanics is unaffected.
Representations of Each Number Type That Differ by Scale Factors  [PDF]
Paul Benioff
Advances in Pure Mathematics (APM) , 2013, DOI: 10.4236/apm.2013.34057
Abstract: For each type of number, structures that differ by arbitrary scaling factors and are isomorphic to one another are described. The scaling of number values in one structure, relative to the values in another structure, must be compensated for by scaling of the basic operations and relations (if any) in the structure. The scaling must be such that one structure satisfies the relevant number type axioms if and only if the other structure does.
Six Categories of Illnesses  [PDF]
Paul Valent
Psychology (PSYCH) , 2013, DOI: 10.4236/psych.2013.47082
Abstract:

Studies show that between 40% and 60% of patients attending emergency departments have medically unexplained physical symptoms (MUPS) that are determined by psychosocial factors. However, there exists no clear categorization of these factors and the symptoms that they produce. This paper delineates six categories of illnesses that help to overcome this deficit. The categories of illnesses are 1) Typical physical illnesses; 2) Typical psychiatric illnesses; 3) Psychophysiological symptoms; 4) Symptoms associated with reliving traumas; 5) “Cherished” or hysterical symptoms; 6) Symptoms that identify with illnesses of others. Clinical examples of each category are provided.

Why the Expansion of the Universe Appears to Accelerate  [PDF]
Paul Smeulders
Journal of Modern Physics (JMP) , 2013, DOI: 10.4236/jmp.2013.46107
Abstract:

A Speed of Light falling over time inversely proportional to the expansion of the Universe leads to an experimentally observed exponential changing of the Red Shift over time. It is necessary to re-define the Angular Impulse Momentum in order to get a consistent expansion of space on all levels. Conservation of Energy and this newly defined Angular Impulse Momentum then leads to the requirement that all clocks slow down in time inversely proportional to the Red Shift, independent of whether the Speed of Light is constant or not. From the Lorentz equation it then follows that Expansion occurs over space-time and not over space alone. A steady state expansion in true time is then transformed into an exponential expansion for an observer with a local clock. A finite lifetime of the Universe is transformed to an infinite lifetime for these observers including elementary particles.

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