Sample records for vanhauwaert bjelland trond

  1. What is Essential for Virtual Reality Systems to Meet Human Performance Goals? (les Caracteristiques essentielles des systemes VR pour atteindre les objectifs militaires en matiere de performances humaines)

    DTIC Science & Technology

    2001-03-01

    term research efforts to focus on natural interfaces ( innovative metaphors) and on how to model (intelligent) human and object behaviour. In the short...Kalawsky A Virtual Environment for Naval Flight Deck Operations Training 1 by V.S.S. Sastry, J. Steel and E.A. Trott Mission Debriefing System 2 by B.I...stricom.army.mil Email: trond.myhrer@ffi.no continued overleaf ix Antonio GRAMAGE MCS Jean- Paul PAPIN ISDEFE 7, rue Roger Edison, 4 92140 CLAMART 28006 Madrid

  2. The effects of hyperventilation on axonal excitability parameters in patients with diabetes mellitus and polyneuropathy.

    PubMed

    Akça, Gökçen; Yerdelen, Deniz; Balcı, Mustafa Kemal; Uysal, Hilmi

    2016-08-01

    We aimed to explore axonal excitability parameters in patients with diabetes mellitus (DM) and polyneuropathy (PNP) as well as those without PNP. We used the short TROND protocol by QTRAC to measure axonal excitability parameters (strength-duration time constant (SDTC), rheobase, etc.) in 12 healthy subjects and 14 DM patients with PNP and 10 DM patients without PNP. The short TROND protocol was performed before and after 20min of deep hyperventilation in healthy subjects and patients with DM. Also, venous blood pH and partial pressure of O2 and CO2 were recorded before hyperventilation (HPV) and after 20min of HPV. A "hyperventilation score" was evaluated before and after HPV. When the values of DM with PNP group and control group before HPV were compared, SDTC and latency were statistically significant. Comparing the values of the excitability parameters after HPV showed statistically significant changes in the SDTC, rheobase, and refractoriness at 2.5ms in controls and DM patients without PNP. HPV resulted in no changes in SDTC in DM patients with PNP. The results of this study suggest that patients with DM and healthy subjects have different responses to HPV, and pH changes have different effects on diabetic PNP compared with healthy controls and DM patients without PNP. Copyright © 2016 Elsevier Ireland Ltd. All rights reserved.

  3. Air Superiority and Airfield Attack - Lessons from History.

    DTIC Science & Technology

    1984-05-15

    escaped the port of Dunkirk and the Luftwaffe had failed miserably to fulfill Giring’s unwarranted boast, "My.Luftwaffe will do it alone.",25 In the forty...AMIENS + CHERBOURG LE HARV" le11 0+ + Figure 2. Combat environment. 35 a single-engine fighter with a flashing fuel-warning light or oil streaming...Brussels-Evere (c) Brussels-Grimbergen (d) Brussels-Melsbrock (e) Antwerp-Durne (f) St. Trond (g) Le Culot (h) Asch (2) Holland (a) Eindhoven, and

  4. Motor excitability measurements: the influence of gender, body mass index, age and temperature in healthy controls.

    PubMed

    Casanova, I; Diaz, A; Pinto, S; de Carvalho, M

    2014-04-01

    The technique of threshold tracking to test axonal excitability gives information about nodal and internodal ion channel function. We aimed to investigate variability of the motor excitability measurements in healthy controls, taking into account age, gender, body mass index (BMI) and small changes in skin temperature. We examined the left median nerve of 47 healthy controls using the automated threshold-tacking program, QTRAC. Statistical multiple regression analysis was applied to test relationship between nerve excitability measurements and subject variables. Comparisons between genders did not find any significant difference (P>0.2 for all comparisons). Multiple regression analysis showed that motor amplitude decreases with age and temperature, stimulus-response slope decreases with age and BMI, and that accommodation half-time decrease with age and temperature. The changes related to demographic features on TRONDE protocol parameters are small and less important than in conventional nerve conduction studies. Nonetheless, our results underscore the relevance of careful temperature control, and indicate that interpretation of stimulus-response slope and accommodation half-time should take into account age and BMI. In contrast, gender is not of major relevance to axonal threshold findings in motor nerves. Copyright © 2014 Elsevier Masson SAS. All rights reserved.

  5. Gravity effects on endogenous movements

    NASA Astrophysics Data System (ADS)

    Johnsson, Anders; Antonsen, Frank

    Gravity effects on endogenous movements A. Johnsson * and F. Antonsen *+ * Department of Physics, Norwegian University of Science and Technology,NO-7491, Trond-heim, Norway, E-mail: anders.johnsson@ntnu.no + Present address: Statoil Research Center Trondheim, NO-7005, Trondheim, Norway Circumnutations in stems/shoots exist in many plants and often consists of more or less regular helical movements around the plumb line under Earth conditions. Recent results on circumnu-tations of Arabidopsis in space (Johnsson et al. 2009) showed that minute amplitude oscilla-tions exist in weightlessness, but that centripetal acceleration (mimicking the gravity) amplified and/or created large amplitude oscillations. Fundamental mechanisms underlying these results will be discussed by modeling the plant tissue as a cylinder of cells coupled together. As a starting point we have modeled (Antonsen 1998) standing waves on a ring of biological cells, as first discussed in a classical paper (Turing 1952). If the coupled cells can change their water content, an `extension' wave could move around the ring. We have studied several, stacked rings of cells coupled into a cylinder that together represent a cylindrical plant tissue. Waves of extensions travelling around the cylinder could then represent the observable circumnutations. The coupling between cells can be due to cell-to-cell diffusion, or to transport via channels, and the coupling can be modeled to vary in both longitudinal and transversal direction of the cylinder. The results from ISS experiments indicate that this cylindrical model of coupled cells should be able to 1) show self-sustained oscillations without the impact of gravity (being en-dogenous) and 2) show how an environmental factor like gravity can amplify or generate the oscillatory movements. Gravity has been introduced in the model by a negative, time-delayed feed-back transport across the cylinder. This represents the physiological reactions to acceler