1,150 research outputs found
Schutter (Κ. H. E.). Quibus annis comoediae Plautinae primum actae sint quaeritur
No full textDe Saint Denis E. Schutter (Κ. H. E.). Quibus annis comoediae Plautinae primum actae sint quaeritur. In: Revue belge de philologie et d'histoire, tome 31, fasc. 2-3, 1953. pp. 562-564
Schutter (Κ. H. E.). Quibus annis comoediae Plautinae primum actae sint quaeritur
No full textDe Saint Denis E. Schutter (Κ. H. E.). Quibus annis comoediae Plautinae primum actae sint quaeritur. In: Revue belge de philologie et d'histoire, tome 31, fasc. 2-3, 1953. pp. 562-564
Long-Term Depression at Parallel Fiber to Golgi Cell Synapses
No full textRobberechts Q, Wijnants M, Giugliano M, De Schutter E. Longterm depression at parallel fiber to Golgi cell synapses. J Neurophysiol 104: 3413-3423, 2010. First published September 22, 2010; doi:10.1152/jn.00030.2010. Golgi cells (GoCs) are the primary inhibitory interneurons of the granular layer of the cerebellum. Their inhibition of granule cells is central to operate the relay of excitatory inputs to the cerebellar cortex. Parallel fibers (PFs) establish synapses to the GoCs in the molecular layer; these synapses contain AMPA, N-methyl-D-aspartate (NMDA), and mostly group II metabotropic glutamate receptors. Long-term changes in the efficacy of synaptic transmission at the PF-GoC synapse have not been described previously. We used whole cell patch-clamp recordings of GoCs in acute rat cerebellar slices to study synaptic plasticity. We report that high-frequency burst stimulation of PFs, using a current-clamp or voltage-clamp induction protocol, gave rise to long-term depression (LTD) at the PF-GoC synapse. This form of LTD was not associated with persistent changes of paired-pulse ratio, suggesting a postsynaptic origin. Furthermore, LTD induction was not dependent on activation of NMDA receptors. PF-GoC LTD does require activation of specifically group II metabotropic glutamate receptors and of protein kinase A.BM
Κ. H. E. Schutter, Quibus annis comoediae plautinae primum actae sint quaeritur, 1952
No full textAndrieu J. Κ. H. E. Schutter, Quibus annis comoediae plautinae primum actae sint quaeritur, 1952. In: Bulletin de l'Association Guillaume Budé,n°3, octobre 1952. p. 111
K. H. E. Schutter, Quibus annis comoediae Plautinae primum actae sint quaeritur. Diss. Groningue
No full textHerrmann Léon. K. H. E. Schutter, Quibus annis comoediae Plautinae primum actae sint quaeritur. Diss. Groningue. In: L'antiquité classique, Tome 22, fasc. 1, 1953. pp. 176-177
Damage to concrete structures
No full textSerious degratadtion mechanisms can severely reduce the service lif of concrete structures : steel reinforcement can corrode, cement matrix can be attacked, and even aggregates can show detrimental processes. Therefore, it is important to understand how damage can occur to concrete structures and to appreciate the time of the actions leasing to damage. Damage to Concrete Structures summarizes the state-of-the-art information on the degradation of concrete structures, and gives a clear comprehensive overveiw of what can go wrong. Offering a logical flow, the chapters are ordered according to the chronological timing of the actions leading to concrete damage. The author explains the different actions or mechanisms in a fundamental manner, without too many physical details, to provide greater clarity and readability. The book describes the different causes of damage to concrete, including inappropriate design, errors during execution, mechanisms occurring during hardening of concrete, and actions or degradation mechanisms during service life (hardened concrete). The degradation mechanisms are illustrated with numerous real-world examples and many drawings and photographs taken of actual structures. Written as a textbook for students as well as a reference for professionals, this easy-to-comprehend book gives readers a deeper understanding of the damage that can occur to concrete during the construction process and service
Planar contour tracking in the presence of pose and model errors by Kalman filtering techniques
No full textThe paper presents a solution to the problem of planar contour tracking with a force-controlled robot. The contour shape is unknown and is characterized at each time step by the curvature together with the orientation angle and arc length. The unknown contour curvature, continuously changing, is supposed to be within a preliminary given interval. An Interacting Multiple Model (IMM) filter is implemented to cope with the uncertainties. The interval of possible curvature values is discretized, i.e., a grid is formed and several Extended Kalman filters (EKFs) are run in parallel. The curvature estimate represents a fusion of the values from the grid with the IMM probabilities. The orientation angle estimate is also a fusion of the estimates, obtained from the separate Kalman filters with the mode probabilities. A single-model EKF is implemented to localize the unknown initial robot end-effector position over the contour. The performance of both algorithms is investigated and results, based on real data, are presented
On the firing rate dependency of the phase response curve of rat Purkinje neurons in vitro.
No full textSynchronous spiking during cerebellar tasks has been observed across Purkinje cells: however, little is known about the intrinsic cellular mechanisms responsible for its initiation, cessation and stability. The Phase Response Curve (PRC), a simple input-output characterization of single cells, can provide insights into individual and collective properties of neurons and networks, by quantifying the impact of an infinitesimal depolarizing current pulse on the time of occurrence of subsequent action potentials, while a neuron is firing tonically. Recently, the PRC theory applied to cerebellar Purkinje cells revealed that these behave as phase-independent integrators at low firing rates, and switch to a phase-dependent mode at high rates. Given the implications for computation and information processing in the cerebellum and the possible role of synchrony in the communication with its post-synaptic targets, we further explored the firing rate dependency of the PRC in Purkinje cells. We isolated key factors for the experimental estimation of the PRC and developed a closed-loop approach to reliably compute the PRC across diverse firing rates in the same cell. Our results show unambiguously that the PRC of individual Purkinje cells is firing rate dependent and that it smoothly transitions from phase independent integrator to a phase dependent mode. Using computational models we show that neither channel noise nor a realistic cell morphology are responsible for the rate dependent shift in the phase response curve
A novel bi-level temporally-distributed MPC approach: An application to green urban mobility
No full textModel predictive control (MPC) has been widely used for traffic management, such as for minimizing the total time spent or the total emissions of vehicles. When long-term green urban mobility is considered including e.g. a constraint on the total yearly emissions, the optimization horizon of the MPC problem is significantly larger than the control sampling time, and thus the number of the variables that should be optimized per control time step becomes very large. For systems with dynamics that involve nonlinear, non-convex, and non-smooth functions, including urban traffic networks, this results in optimization problems that are computationally intractable in real time. In this paper, we propose a novel bi-level temporal distribution of such complex MPC optimization problems, and we develop two mathematically linked short-term and long-term MPC formulations with small and large control sampling times that will be solved together instead of the original complex optimization problem. The resulting bi-level control architecture is used to solve the two MPC formulations online for real-time control of urban traffic networks with the objective of long-term green mobility. In order to assess the performance of the bi-level control architecture, we perform a case study where a rough version of the model of the urban traffic flow, S-model, is used by the long-term MPC level to estimate the states of the urban traffic networks, and a detailed version of the model is used by the short-term MPC level. The results of the simulations prove the effectiveness (with respect to the objective of control, as well as computational efficiency) of the proposed bi-level MPC approach, compared to state-of-the-art control approaches.Control & SimulationTransport and PlanningTeam Bart De SchutterDelft Center for Systems and Contro
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