787 research outputs found
Prediction of cesarean section risk in women with gestational hypertension or mild preeclampsia at term
No full textAbstract not availableKarin van der Tuuk, Maria G. van Pampus, Corine M. Koopmans, Jan G. Aarnoudse, Paul P. van den Berg, Johannes J. van Beek, Frans J.A. Copraij, Gunilla Kleiverda, Martina Porath, Robbert J.P. Rijnders, Paulien C.M. van der Salm, Leonard P. Morssink, Rob H. Stigter, Ben W.J. Mol, Henk Groen, for the HYPITAT study grou
Corrigendum: Machine learning clinical decision support for interdisciplinary multimodal chronic musculoskeletal pain treatment
No full textIn the published article, there was a mistake in the corresponding author email address for author Rob J. E. M. Smeets. The email was incorrectly displayed as “[email protected]” The correct email address is: “[email protected]” The authors apologize for this error and state that this does not change the scientific conclusions of the article in any way. The original article has been updated.</p
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No full textDeze bundel is een mooie staalkaart van de ontwikkelingen in de Nederlandse archeologie in de laatste twintig jaar. Sommige artikelen vertegenwoordigen de wens om kennis op te doen over het verleden zelf, door velen benoemd als het ultieme of hoofddoel van de archeologiebeoefening. Deze zeer uiteenlopende bijdragen delen, terecht, een sterke voorkeur voor een gedegen empirische invalshoek. Ze geven een fascinerend beeld van de reikwijdte en diepgang van het archeologische vlak. In andere artikelen staan innovaties op het vlak van methoden en technieken centraal. De overige artikelen behelzen de duurzame zorg voor het archeologische erfgoed. Duidelijk is dat het object van studie en zorg zich de laatste jaren sterk verbreedt; het omvat tegenwoordig ook het cultuurlandschap in haar huidige en verleden vorm. Behoud van archeologische en cultuurlandschappelijke resten, zo luidt de gangbare opvatting, is van belang omdat men in de toekomst met betere methoden en technieken kennis kan nemen van het verleden; daarnaast verdienen toekomstige generaties het om kennis te kunnen nemen van een authentiek verleden vanuit eigen, nieuwe vraagstellingen. Intussen wordt echter steeds duidelijker dat erfgoedbehoud ook een doel op zich is, ook los van de tegenwoordige of toekomstige vraag naar hoe het in het verleden was. Archeologisch erfgoed vindt namelijk steeds meer waardering als een intrinsiek, authentiek en onvervangbaar onderdeel van een waardevolle, betekenisdragende omgeving. Het heeft juist waarde zonder er kennis van te nemen.
Inhoud
- De Romeinse loskade van Cuijk, botanisch gezien (Corrie Bakels en Wim Kuiper)
- Wetlands en menselijke bestaansmogelijkheden in de late prehistorie (Otto Brinkkemper)
- Hoe de archeologie uit de romantiek verdween: enkele ontwikkelingen in de methoden en technieken van het Nederlandse archeologische veldwerk sinds 1970 (Jos Deeben, Jan van Doesburg en Fedor van Kregten)
- De Nederlandse prehistoricus F.C. Bursch en zijn SS-expeditie naar de Oekraïne; grafheuvelonderzoek achter het Oostfront (Martijn Eickhoff)
- Gladius cuius capulus aureus erat. Een zwaard met gouden gevest uit Dorestad (W.A. van Es)
- Een plotselinge zon-gestuurde klimaatsverandering omstreek 850 voor Chr. als oorzaak van de expansie van de Scythen? (Bas van Geel, N.A. Bokovenko, N.D. Burova, K.V. Chugunov, V.A. Dergachev, V.G. Dirksen, M. Kulkova, A. Nagler, H. Parzinger, J. van der Plicht, S.S. Vasiliev en G.I. Zaitseva)
- Sporen van oud groen. Bomen en bos in het historische cultuurlandschap van Zutphen-Looërenk (Bert J. Groenewoudt)
- De autochtone wortels van predictive modelling; van Reuvens tot IKAW3 (Daan P. Hallewas)
- Bovenkarspel revisited. Over de toekomst van een wettelijk beschermd bronstijdlandschap (Robert van Heeringen, Fedor van Kregten en Iepie Roorda)
- Easily-decayed organic remains in urban archaeological deposits: value, threats, research directions and conservation (Harry Kenward en Allan Hall)
- Uslarien? Rijn-Wezer-Germaans aardewerk op Nederlandse bodem (Ernst Taayke)
- Groeten uit Brabant. Archeologische Monumentenzorg in Noord-Brabant: terugblik en toekomst (Liesbeth Theunissen en Martin Meffert)
- Germaanse wigvormige vangkuilen te Denekamp in hun ecologische en archeologische context (Ad Verlinde)
- De levensduur van gebouwen met aardvaste stijlen (W. Haio Zimmermann
Correction to: [18F]mFBG PET‑CT for detection and localisation of neuroblastoma: a prospective pilot study (European Journal of Nuclear Medicine and Molecular Imaging, (2023), 50, 4, (1146-1157), 10.1007/s00259-022-06063-6)
No full textThe article [ 18F]mFBG PET‑CT for detection and localisation of neuroblastoma: a prospective pilot study, written by Atia Samim, Thomas Blom, Alex J. Poot, Albert D. Windhorst, Marta Fiocco, Nelleke Tolboom, Arthur J. A. T. Braat, Sebastiaan L. Meyer Viol, Rob van Rooij, Max M. van Noesel, Marnix G. E. H. Lam, Godelieve A. M. Tytgat, and Bart de Keizer, was originally published Online First without Open Access. After publication in volume 50, issue 4, page 1146 - 1157 the author decided to opt for Open Choice and to make the article an Open Access publication
Genetic risk and a primary role for cell-mediated immune mechanisms in multiple sclerosis
Full text linkMultiple sclerosis is a common disease of the central nervous system in which the interplay between inflammatory and neurodegenerative processes typically results in intermittent neurological disturbance followed by progressive accumulation of disability. Epidemiological studies have shown that genetic factors are primarily responsible for the substantially increased frequency of the disease seen in the relatives of affected individuals, and systematic attempts to identify linkage in multiplex families have confirmed that variation within the major histocompatibility complex (MHC) exerts the greatest individual effect on risk. Modestly powered genome-wide association studies (GWAS) have enabled more than 20 additional risk loci to be identified and have shown that multiple variants exerting modest individual effects have a key role in disease susceptibility. Most of the genetic architecture underlying susceptibility to the disease remains to be defined and is anticipated to require the analysis of sample sizes that are beyond the numbers currently available to individual research groups. In a collaborative GWAS involving 9,772 cases of European descent collected by 23 research groups working in 15 different countries, we have replicated almost all of the previously suggested associations and identified at least a further 29 novel susceptibility loci. Within the MHC we have refined the identity of the HLA-DRB1 risk alleles and confirmed that variation in the HLA-A gene underlies the independent protective effect attributable to the class I region. Immunologically relevant genes are significantly overrepresented among those mapping close to the identified loci and particularly implicate T-helper-cell differentiation in the pathogenesis of multiple sclerosis
Discontinuous molecular dynamics for semiflexible and rigid bodies
No full textA general framework for performing event-driven simulations of systems with semiflexible or rigid bodies interacting under impulsive forces is outlined. The method consists of specifying a means of computing the free evolution of constrained motion, evaluating the times at which interactions occur, and determining the consequences of interactions on subsequent motion. Algorithms for computing the times of interaction events and carrying out efficient event-driven simulations are discussed. The semiflexible case and the rigid case differ qualitatively in that the free motion of a rigid body can be computed analytically and need not be integrated numerically. (c) 2007 American Institute of Physics.PT: J; CR: ABRAMOWITZ M, 1965, HDB MATH FUNCTIONS F ALDER BJ, 1959, J CHEM PHYS, V31, P459 ALDER BJ, 1960, J CHEM PHYS, V33, P1439 ALLEN MP, 1987, COMPUTER SIMULATION ALLEN MP, 1989, COMPUT PHYS REP, V9, P301 ANDERSEN HC, 1983, J COMPUT PHYS, V52, P24 BARAFF D, 1989, COMPUT GRAPH, V23, P223 BARAFF D, 1992, THESIS CORNELL U BRENT RP, 1973, ALGORITHMS MINIMIZAT CARTER EA, 1989, CHEM PHYS LETT, V156, P472 CHAPELA GA, 1984, MOL PHYS, V53, P139 CHAPELA GA, 1989, CHEM PHYS, V129, P201 CICCOTTI G, 2004, J STAT PHYS, V115, P701 DELAPENA LH, UNPUB DELAPENA LH, 2005, J CHEM PHYS, V126 DEMICHELE C, 2006, J PHYS CHEM B, V110, P8064 DONEV A, 2005, J COMPUT PHYS, V202, P737 DONEV A, 2005, J COMPUT PHYS, V202, P765 ERPENBECK JJ, 1977, STAT MECH B FIXMAN M, 1974, P NATL ACAD SCI USA, V71, P3050 FRENKEL D, 2004, UNDERSTANDING MOL DY GALASSI M, 2005, GNU SCI LIB REFERENC GOLDSTEIN H, CLASSICAL MECH JACOBI CGJ, 1849, J CRELLE, V39, P293 KNOPP K, 1947, THEORY FUNCTIONS 2 LANDAU LD, 1976, MECHANICS LUBACHEVSKY BD, 1991, J COMPUT PHYS, V94, P255 MARIN M, 1993, J COMPUT PHYS, V109, P306 MARIN M, 1995, COMPUT PHYS COMMUN, V92, P214 MARSDEN JE, 2002, INTRO MECH SYMMETRY MASUTANI Y, 1994, P IEEE INT C ROB AUT, V2, P1066 MELCHIONNA S, 2000, PHYS REV E A, V61, P6165 MOSHIER SL, 1989, METHODS PROGRAMS MAT PRESS WH, 1992, NUMERICLA RECIPES FO RAMSHAW JD, 1986, PHYS LETT A, V116, P110 RAPAPORT DC, 1980, J COMPUT PHYS, V34, P184 RAPAPORT DC, 2004, ART MOL DYNAMICS SIM RUEB AS, 1834, THESIS UTRECHT NETHE RYCKAERT JP, 1977, J COMPUT PHYS, V23, P327 TUCKERMAN ME, 1999, EUROPHYS LETT, V45, P149 TUCKERMAN ME, 2001, J CHEM PHYS, V115, P1678 VANZON R, IN PRESS J COMPUT PH VANZON R, 2002, PHYS REV E 1, V65 WHITTAKER ET, 1937, TREATISE ANAL DYMANI; NR: 44; TC: 1; J9: J CHEM PHYS; PG: 13; GA: 138VLSource type: Electronic(1
Tactile Feedback for Artery Detection in Minimally Invasive Robotic Surgery –Preliminary Results of a New Approach
No full textMinimally invasive robotic surgery (MIRS) entails
total absence of haptic feedback due to the spatial separation
of patient and surgeon. In conventional surgery, however,
palpation to detect superficial arteries by a slight pulsation is
an important, commonly applied, and security-relevant procedure.
Therefore, an ultrasound based unidirectional sensor for
MIRS was developed feeding back kinesthetic impulses to the
surgeon-sided haptic input device
Humanoid fall avoidance using a mixture of strategies
No full textIf we are to one day rely on robots as assistive devices they should be capable of mitigating the impact of random disturbances and avoid falling. Humans are surprisingly apt at remaining on their feet when pushed; they rely on reflexes such as bending the ankles and-or the hips, or by taking a step if the magnitude of the disturbance is relatively large. This paper presents a fall avoidance scheme that is capable of applying both ankle and hip strategies on a humanoid robot. While both strategies serve the same purpose, the hip strategy can absorb larger disturbances but has a higher energy overhead and should be avoided when it is not necessary. Our system is capable of detecting at the onset of a disturbance if an ankle or hip strategy is more appropriate. The decision is taken based on a 'decision surface' that is delimited by threshold values of the robot's state variables. The control is based on the Virtual Model Control (VMC) approach. The system is tested on a simulated robot developed under Gazebo as well as on a real small-scale humanoid robot. Results show successful fall avoidance with an ability to choose the optimum fall avoidance strategy. © 2012 World Scientific Publishing Company.Abdallah M., 2005, P 2005 IEEE INT C RO; Azevedo C, 2004, ROBOT AUTON SYST, V47, P203, DOI 10.1016-j.robot.2004.03.013; Hemami H., 1979, J INTERDISC MODEL SI, V2; Hyon SH, 2007, IEEE INT CONF ROBOT, P2668, DOI 10.1109-ROBOT.2007.363868; Jalgha B., 2009, LECT NOTES COMPUTER, V5744; Kanamiya Y, 2010, IEEE INT CONF ROBOT, P3446, DOI 10.1109-ROBOT.2010.5509785; Koenig N., 2004, P IEEE RSJ INT C INT, P2149; Nenchev DN, 2008, ROBOTICA, V26, P643, DOI 10.1017-S0263574708004268; Pratt G., 2006, SERIES ELASTIC ACTUA; Pratt J., 2006, P IEEE INT C HUM ROB; Pratt J., 2007, P IEEE INT C HUM ROB; Pratt J, 2001, INT J ROBOT RES, V20, P129, DOI 10.1177-02783640122067309; Pratt J. E., 2000, THESIS MIT CAMBRIDGE; Stephens B., 2007, P IEEE C INT ROB SYS; Stephens B., 2007, P IEEERAS INT C HUM; Vukpbratovic B., 2007, INT J HUM ROBOT, V18, P157; Winter D. A., 1995, GAIT POSTURE, V3, P193, DOI 10.1016-0966-6362(96)82849-910
Sycandra tabulata Schuffner 1877, nom.nov.
No full textSycandra tabulata Schuffner, 1877 Schuffner (1877: 422, pl. 25 fig. 11) described this Sycon species from Mauritius, comparing it with Sycon elegans (Bowerbank, 1845). Its skeleton is distinct only by the thick bushes of thin fusiforms diactines (140 x 4 µm) in the distal cones of the radial tubes. Borojević (1967) in turn compared his record of Sycon elegans from South Africa with Schuffner’s species. Since S. elegans is a Northeast Atlantic species, this may be interpreted as a suggestion that the South African record may indeed be better assigned to Sycon tabulatum. Schuffner’s combination is preoccupied: it is a junior primary homonym of Sycandra tabulata Haeckel, 1872. Dendy & Row (1913) noticed this already, but assumed both homonyms belonged to Sycon elegans. In view of the fact that Bowerbank's and Haeckel's specimens were from the Mediterranean, while Schuffner's was from Mauritius this synonymy is judged to be unlikely. We propose here to rename Schuffner’s species as Sycon oscari nom.nov. The name is given to honor Oscar Schuffner, the author of its original name.Published as part of Van, Rob W. M. & De, Nicole J., 2018, Calcareous sponges of the Western Indian Ocean and Red Sea, pp. 1-160 in Zootaxa 4426 (1) on page 150, DOI: 10.11646/zootaxa.4426.1.1, http://zenodo.org/record/127123
Rotation identification in geometric algebra : theory and application to the navigation of underwater robots in the field
Full text link© The Author(s), 2015. This article is distributed under the terms of the Creative Commons Attribution License. The definitive version was published in Journal of Field Robotics 32 (2015): 632–654, doi:10.1002/rob.21572.We report the derivation and experimental evaluation of a stable adaptive identifier to estimate rigid body rotations using rotors in Geometric Algebra (GA). This work is motivated by the need for in situ estimation of the alignment between sensors commonly used in underwater vehicle navigation. Here we derive an adaptive identifier using a geometric interpretation of the error to drive first-order rotor kinematics. We prove that it is Lyapunov stable, and we show that it is asymptotically stable in the presence of persistent excitation. We use the identifier to estimate the alignment between the Doppler velocity log sonar and the fiber optic gyrocompass used by underwater vehicles for dead reckoning (DR). We evaluate this method in the laboratory with a remotely operated vehicle (ROV), and then with an autonomous underwater vehicle (AUV) operating in the field at 1,200 m depth. Our results show that this technique reduces dead reckoning navigation errors on these platforms and provides comparable performance to previously reported SO(3) constrained Linear Algebra (LA) approaches. The rotor identifier has a number of advantages over these previously reported methods, including a more straightforward derivation, simpler gain tuning, increased computational efficiency, and reduced data manipulation.This work was supported in part by the National Defense Science and Engineering Graduate Program (MJS), the Edwin A. Link Foundation (MJS), the WHOI Academic Programs Office (MJS), The Jessie B. Cox Endowed Fund in Support of Scientific Staff (JCK), and The Penzance Endowed Fund in Support of Assistant Scientists (JCK)
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