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    • Several versions

    Study of pseudorapidity dependence of the anisotropic flow with ALICE at the LHC

    Hansen, Alexander
    arXiv.org, Oct 26, 2012 [Peer Reviewed Journal]

    • Dissertation
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    Title: En jämförelse mellan markbundna resistivitetsmätningar och helikopterburen Sky-TEM i Skåne
    Author: Hansen, Alexander
    Date: 2013
    Subject: Technology ; Teknik ; Resistivitet ; Grundvatten ; Natural Resources Engineering, Master'S ; Civilingenjör, Naturresursteknik ; Examensarbete, Minst 30 Hp ; Student Thesis, At Least 30 Credits
    Description: Access to groundwater of good quality may in some places be limited. The Geological Surveyof Sweden (SGU) has for the first time in Sweden used Sky-TEM (Danish developed systemfor measurements with Transient Electromagnetic by helicopter) in an area of Skåne tomeasure the resistivity of the ground and thus identify areas with saline groundwater. Thisthesis has its basis in the comparison between those Sky-TEM measurements and fieldworkwith geoelectrical measurements (electrical resistivity measurement with a multi-electrodesystem)The geoelectrical measurements were carried out along two profiles in the area of theprivios Sky-TEM measurements. One of the profiles (Annero) in an area where the depthdown to the saline groundwater were interpreted to be large, and the other (Lillevångsgatan)in an area where the depth was interpreted to be small.The interpretations of Sky-TEM and geoelectrical measurements were not entirely inagreement with each other. They both showed a greater depth to the saline groundwater atAnnero and a smaller depth at Lillevång, but also that measurements with Sky-TEMsystematically pointed to a greater depth to the saline groundwater compared to thegeoelectrical. It could be derived from that TEM works best at low resistivities (

    • Several versions

    Generic framework for anisotropic flow analyses with multi-particle azimuthal correlations

    Bilandzic, Ante, Gulbrandsen, Kristjan, Hansen, Alexander, Zhou, You
    arXiv.org, Dec 20, 2013 [Peer Reviewed Journal]

    • Several versions

    Hearing in schoolchildren after neonatal exposure to a high-dose gentamicin regimen

    Hemmingsen, Dagny, Mikalsen, Camilla, Rydland Hansen, Alexander, Fjalstad, Jon Widding, Stenklev, Niels Christian, Klingenberg, Claus
    Pediatrics (Evanston), 2020 [Peer Reviewed Journal]

    • Article
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    UBC-Nepal expedition: peripheral fatigue recovers faster in Sherpa than lowlanders at high altitude

    Ruggiero, Luca, Hoiland, Ryan L, Hansen, Alexander B, Ainslie, Philip N, Mcneil, Chris J
    The Journal of physiology, November 2018, Vol.596(22), pp.5365-5377 [Peer Reviewed Journal]
    MEDLINE/PubMed (U.S. National Library of Medicine)
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    Title: UBC-Nepal expedition: peripheral fatigue recovers faster in Sherpa than lowlanders at high altitude
    Author: Ruggiero, Luca; Hoiland, Ryan L; Hansen, Alexander B; Ainslie, Philip N; Mcneil, Chris J
    Subject: Contractile Properties ; Electrical Stimulation ; Hypoxia ; Muscle Oxygenation ; Quadricep ; Altitude ; Expeditions ; Fatigue ; Acclimatization -- Physiology ; Muscle, Skeletal -- Physiopathology
    Description: The reduced oxygen tension of high altitude compromises performance in lowlanders. In this environment, Sherpa display superior performance, but little is known on this issue. Sherpa present unique genotypic and phenotypic characteristics at the muscular level, which may enhance resistance to peripheral fatigue at high altitude compared to lowlanders. We studied the impact of gradual ascent and exposure to high altitude (5050 m) on peripheral fatigue in age-matched lowlanders and Sherpa, using intermittent electrically-evoked contractions of the knee extensors. Peripheral fatigue (force loss) was lower in Sherpa during the first part of the protocol. Post-protocol, the rate of force development and contractile impulse recovered faster in Sherpa than in lowlanders. At any time, indices of muscle oxygenation were not different between groups. Muscle contractile properties in Sherpa, independent of muscle oxygenation, were less perturbed by non-volitional fatigue. Hence, elements within the... Altitude-related acclimatisation is characterised by marked muscular adaptations. Lowlanders and Sherpa differ in their muscular genotypic and phenotypic characteristics, which may influence peripheral fatigability at altitude. After gradual ascent to 5050 m, 12 lowlanders and 10 age-matched Sherpa (32 ± 10 vs. 31 ± 11 years, respectively) underwent three bouts (separated by 15 s rest) of 75 intermittent electrically-evoked contractions (12 pulses at 15 Hz, 1.6 s between train onsets) of the dominant leg quadriceps, at the intensity which initially evoked 30% of maximal voluntary force. Trains were also delivered at minutes 1, 2 and 3 after the protocol to measure recovery. Tissue oxygenation index (TOI) and total haemoglobin (tHb) were quantified by a near-infrared spectroscopy probe secured over rectus femoris. Superficial femoral artery blood flow was recorded using ultrasonography, and delivery of oxygen was estimated (eDO ). At the end of bout 1, peak force was greater in Sherpa than...
    Is part of: The Journal of physiology, November 2018, Vol.596(22), pp.5365-5377
    Identifier: 1469-7793 (E-ISSN); 30239002 Version (PMID); 10.1113/JP276599 (DOI)

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    Implementation of a Relative Positioning System based on Ultrasound

    Hansen, Alexander Rydland, Fasting, Erlend
    Norwegian Open Research Archives (NORA)
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    Title: Implementation of a Relative Positioning System based on Ultrasound
    Author: Hansen, Alexander Rydland; Fasting, Erlend
    Publisher: NTNU
    Date: 2016
    Subject: Elektronikk, Akustikk ; Elektronikk, Signalbehandling, Akustikk Og Media
    Description: Speech communication is essential in human interaction. When working or residing in noisy environments, hearing protectors must be used. This leads to reduced communication abilities. If traditional communications systems are used, the natural ability to localize sounds spatially is reduced, resulting in discomfort and unnatural communication. To aid natural communication in noisy environments, a spatially aided communication system is proposed. The system is able to localize other participants and use their relative position to emulate a spatial position of the speech in the audio domain. Thus, the users will be able to differentiate between participants in a natural way. The system uses ultrasonic signals to determine the position of other users by defining the relative angle and distance between users. HRTF-filtering is applied to an audio signal transmitted by RF. The work includes the development of a system model based on the human auditory system, definition of...

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    Switching, Adverse Effects and Use of Over-the-Counter Analgesics among Users of Oral Anticoagulants: A Pharmacy-based Survey

    Hellfritzsch, Maja, Hyllested, Lea Maria Rønneberg, Meegaard, Line, Wiberg-Hansen, Alexander, Grove, Erik Lerkevang, Pottegård, Anton
    Basic & clinical pharmacology & toxicology, July 2017, Vol.121(1), pp.37-43 [Peer Reviewed Journal]
    MEDLINE/PubMed (U.S. National Library of Medicine)
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    Title: Switching, Adverse Effects and Use of Over-the-Counter Analgesics among Users of Oral Anticoagulants: A Pharmacy-based Survey
    Author: Hellfritzsch, Maja; Hyllested, Lea Maria Rønneberg; Meegaard, Line; Wiberg-Hansen, Alexander; Grove, Erik Lerkevang; Pottegård, Anton
    Subject: Analgesics -- Pharmacology ; Anticoagulants -- Pharmacology ; Atrial Fibrillation -- Drug Therapy ; Drug Substitution -- Statistics & Numerical Data ; Nonprescription Drugs -- Pharmacology ; Prescription Drugs -- Pharmacology
    Description: Oral anticoagulants are widely used but information on important aspects in that respect is not available from medical registers or clinical databases. Therefore, we conducted a survey including patients filling a prescription for oral anticoagulants at two large Danish community pharmacies. We collected information concerning the patients' knowledge of their anticoagulant treatment including prior drug switching. Further, patients were asked about use of over-the-counter analgesics, adverse effects and how the treatment affected their everyday life. Among 335 eligible patients, 301 (90%) agreed to participate. Atrial fibrillation was the most common indication (65%), and most patients filled a prescription for a non-vitamin K antagonist oral anticoagulant (NOAC) (58%). Among the 12% (n = 35) of participants who had switched oral anticoagulant treatment, 69% had switched from a vitamin K antagonist (VKA) to a NOAC. Switching was most frequently caused by inconvenience (34%) and adverse...
    Is part of: Basic & clinical pharmacology & toxicology, July 2017, Vol.121(1), pp.37-43
    Identifier: 1742-7843 (E-ISSN); 28132418 Version (PMID); 10.1111/bcpt.12762 (DOI)

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    Predicting Plasma Glucose From Interstitial Glucose Observations Using Bayesian Methods

    Hansen, Alexander Hildenbrand, Duun-Henriksen, Anne Katrine, Juhl, Rune, Schmidt, Signe, Nørgaard, Kirsten, Jørgensen, John Bagterp, Madsen, Henrik
    Journal of diabetes science and technology, March 2014, Vol.8(2), pp.321-330 [Peer Reviewed Journal]
    MEDLINE/PubMed (U.S. National Library of Medicine)
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    Title: Predicting Plasma Glucose From Interstitial Glucose Observations Using Bayesian Methods
    Author: Hansen, Alexander Hildenbrand; Duun-Henriksen, Anne Katrine; Juhl, Rune; Schmidt, Signe; Nørgaard, Kirsten; Jørgensen, John Bagterp; Madsen, Henrik
    Subject: Bayesian Methods ; PG-Ig Dynamics ; Plasma Glucose Dynamics ; Stochastic Differential Equations ; Stochastic Gray-Box Modeling ; Type 1 Diabetes Mellitus
    Description: One way of constructing a control algorithm for an artificial pancreas is to identify a model capable of predicting plasma glucose (PG) from interstitial glucose (IG) observations. Stochastic differential equations (SDEs) make it possible to account both for the unknown influence of the continuous glucose monitor (CGM) and for unknown physiological influences. Combined with prior knowledge about the measurement devices, this approach can be used to obtain a robust predictive model. A stochastic-differential-equation-based gray box (SDE-GB) model is formulated on the basis of an identifiable physiological model of the glucoregulatory system for type 1 diabetes mellitus (T1DM) patients. A Bayesian method is used to estimate robust parameters from clinical data. The models are then used to predict PG from IG observations from 2 separate study occasions on the same patient. First, all statistically significant diffusion terms of the model are identified using likelihood ratio tests, yielding...
    Is part of: Journal of diabetes science and technology, March 2014, Vol.8(2), pp.321-330
    Identifier: 1932-2968 (E-ISSN); 24876584 Version (PMID)

    • Several versions

    C-peptide exerts beneficial effects on myocardial blood flow and function in patients with type 1 diabetes

    Hansen, Alexander, Johansson, Bo-Lennart, Wahren, John, Von Bibra, Helene
    Diabetes, October 2002, Vol.51(10), pp.3077-82 [Peer Reviewed Journal]

    • Several versions

    Caught in the act: entrapped embolus through a patent foramen ovale

    Hansen, Alexander, Kuecherer, Helmut
    European Journal of Echocardiography, 2008, Vol. 9(5), pp.692-693 [Peer Reviewed Journal]