Searched for: subject%3A%22Frequency%255C%2Banalysis%22
(1 - 16 of 16)
document
Harmanny, R.I.A. (author), de Wit, J.J.M. (author), Prémel Cabic, G. (author)
The radar micro-Doppler signature of a target is determined by parts of the target moving or rotating in addition to the main body motion. The relative motion of parts is characteristic for different classes of targets, e.g. the flapping motion of a bird's wings vs. the spinning of propeller blades. In the present study, the micro-Doppler...
conference paper 2014
document
de Wit, J.J.M. (author), Harmanny, R.I.A. (author), Molchanov, P. (author)
Abstract—The micro-Doppler spectrogram depends on parts of a target moving and rotating in addition to the main body motion (e.g., spinning rotor blades) and is thus characteristic for the type of target. In this study, the micro-Doppler spectrogram is exploited to distinguish between birds and small unmanned aerial vehicles (UAVs). The focus...
conference paper 2014
document
Pyayt, A.L. (author), Kozionov, A.P. (author), Mokhov, I.I. (author), Lang, B. (author), Meijer, R.J. (author), Krzhizhanovskaya, V.V. (author), Sloot, P.M.A. (author)
Detection of early warning signals for the imminent failure of large and complex engineered structures is a daunting challenge with many open research questions. In this paper we report on novel ways to perform Structural Health Monitoring (SHM) of flood protection systems (levees, earthen dikes and concrete dams) using sensor data. We present a...
article 2014
document
Toonen, W.H.J. (author), de Molenaar, M.M. (author), Bunnik, F.P.M. (author), Middelkoop, H. (author)
A Chézy-based hydraulic model was run to estimate the magnitude of extreme floods of Middle Holocene age in the Lower Rhine Valley (Germany). Input parameters were gathered from the field and literature, and used in ten scenarios to calculate a best guess estimate for the minimum size of extreme floods. These events have been registered as...
article 2013
document
Mert, A. (author), Klöpping-Ketelaars, I. (author), Bles, W. (author), TNO Defensie en Veiligheid (author)
Motion sickness incidence (MSI) for vertical sinusoidal motion reaches a maximum at 0.167 Hz. Normal breathing frequency is close to this frequency. There is some evidence for synchronization of breathing with this stimulus frequency. If this enforced breathing takes place over a larger frequency range (0.05-0.8 Hz) and whether this contributes...
article 2009
document
Bosch, T. (author), de Looze, M.P. (author), van Dieën, J.H. (author), TNO Kwaliteit van Leven (author)
Optimization of the temporal aspects of task design requires a better understanding of the development of muscle fatigue in the neck and shoulder region over time. The objective of the study was to investigate this in two production companies and to determine the relationship between objective and subjective estimates of fatigue. Indicators of...
article 2007
document
Rieckmann, P. (author), Kruse, N. (author), Nagelkerken, L. (author), Beckmann, K. (author), Miller, D. (author), Polman, C. (author), Dahlke, F. (author), Toyka, K.V. (author), Hartung, H.P. (author), Stürzebecher, S. (author), TNO Preventie en Gezondheid (author)
Background: Subcutaneous IFNβ-1b (Betaferon®) is an established immunomodulatory treatment for relapsing remitting MS and active secondary progressive multiple sclerosis (SPMS). It modulates cytokine and adhesion molecule expression but long term in vivo effects of IFNβ-1b on the immune system are not known in multiple sclerosis. Objective: To...
article 2005
document
Kuijt-Evers, L.F.M. (author), Twisk, J. (author), Groenesteijn, L. (author), de Looze, M.P. (author), Vink, P. (author), TNO Kwaliteit van Leven (author)
The aim of the study was to identify predictors of comfort and discomfort in using hand tools. For this purpose, the comfort questionnaire for hand tools (CQH) was developed based on the results of a previous study. In the current study, four screwdrivers were evaluated on comfort (expected comfort at first sight and comfort after short time use...
article 2005
document
TNO Kwaliteit van Leven (author), van Uffelen, J.G.Z. (author), Hopman-Rock, M. (author), Chin A Paw, M.J.M. (author), van Mechelen, W. (author)
Background: the prevalence of individuals with cognitive decline is increasing since the number of elderly adults is growing considerably. The literature provides promising results on the beneficial effect of exercise and vitamin supplementation on cognitive function both in cognitively healthy as well as in the demented elderly. Methods/Design:...
article 2005
document
Michielse, C.B. (author), Ram, A.F.J. (author), van den Hondel, C.A.M.J.J. (author), TNO Voeding (author)
The Aspergillus nidulans amdS selection marker was used for the identification of multicopy T-DNA insertions in Agrobacterium-mediated transformation of Asp. awamori. The selection of transformants on agar plates containing acetamide as sole nitrogen source and hygromycin resulted in a six-fold decrease in the transformation frequency, compared...
article 2004
document
Jansen, M.C.J.F. (author), van Kappel, A.L. (author), Ocké, M.C. (author), van 't Veer, P. (author), Boshuizen, H.C. (author), Riboli, E. (author), Bueno-de-Mesquita, H.B. (author), TNO Voeding (author)
Objective: Fruit and vegetable intake is inversely associated with cancer risk in many epidemiological studies. Accurate assessment of consumption of these foods is difficult, and biomarkers of intake would overcome several drawbacks of currently used dietary assessment methods. Therefore, we investigated the relation between plasma carotenoids...
article 2004
document
van den Heuvel, E.G.H.M. (author), Wils, D. (author), Pasman, W.J. (author), Bakker, M. (author), Saniez, M.-H. (author), Kardinaal, A.F.M. (author), TNO Voeding (author)
Objective: To determine the tolerance of increasing dosages of an incompletely hydrolysed and/or incompletely absorbed food dextrin coming from wheat starch, NUTRIOSE®FB, at daily levels of 10 and 15 g up to 60 and 80 g, respectively. Design: A randomized, double-blind, multiple dose, placebo-controlled, combined crossover and parallel trial....
article 2004
document
TNO Arbeid (author), van den Heuvel, S.G. (author), de Looze, M.P. (author), Hildebrandt, V.H. (author), Thé, K.H. (author)
Objectives. This study evaluated the effects on work-related neck and upper-limb disorders among computer workers stimulated (by a software program) to take regular breaks and perform physical exercises. Possible effects on sick leave and productivity were studied as well. Methods. A randomized controlled design was used with cluster...
article 2003
document
TNO Fysisch en Elektronisch Laboratorium (author), Steeghs, T.P.H. (author), Gelsema, S.J. (author)
The use of ISAR imagery for Automatic Target Recognition is seriously hampered by the difficulty of target motion compensation. Phase perturbations that result from target maneuvers during the processing interval need to be corrected for. In a previous paper, we demonstrated the use of the local Radon transform for estimating the radial velocity...
conference paper 2003
document
Steeghs, P. (author), Kester, L. (author), Gelsema, S. (author)
The use of the Radon transform and the Wigner-Radon power spectrum for ISAR motion compensation is described. It is shown that the local Radon power spectrum is closely related to the Cohen's class of quadratic time-frequency representations in a similar way as the Radon and Fourier transform are related. The peak of the local Radon transform is...
conference paper 2002
document
TNO Kwaliteit van Leven (author), Ariëns, G.A.M. (author), Bongers, P.M. (author), Hoogendoorn, W.E. (author), van der Wal, G. (author), van Mechelen, W. (author)
Objectives This study investigates the relationship between physical and psychosocial load at work and sickness absence due to neck pain. Methods A prospective cohort study with a follow-up period of 3 years (1994-1998) was performed among a working population. At the beginning of the study, physical load at work was quantified by means of video...
article 2002
Searched for: subject%3A%22Frequency%255C%2Banalysis%22
(1 - 16 of 16)