Forward pi^0 Production and Associated Transverse Energy Flow in Deep-Inelastic Scattering at HERA

Deep-inelastic positron-proton interactions at low values of Bjorken-x down to x \approx 4.10^-5 which give rise to high transverse momentum pi^0 mesons are studied with the H1 experiment at HERA. The inclusive cross section for pi^0 mesons produced at small angles with respect to the proton remnant (the forward region) is presented as a function of the transverse momentum and energy of the pi^0 and of the four-momentum transfer Q^2 and Bjorken-x. Measurements are also presented of the transverse energy flow in events containing a forward pi^0 meson. Hadronic final state calculations based on QCD models implementing different parton evolution schemes are confronted with the data.Comment: 27 pages, 8 figures and 3 table

Inelastic photoproduction of J/Psi mesons at HERA

An analysis of inelastic photoproduction of J/Psi mesons is presented using data collected at the ep collider HERA corresponding to an integrated luminosity of above 80pb-1. Differential and double differential cross sections are measured in a wide kinematic region: 6

Design study for the accelerating cavity of the racetrack microtron Eindhoven

A 17-cell bi-periodic standing wave slot coupled structure will be used as accelerating structure for the RaceTrack Microtron Eindhoven. The numerical design of the struc ture has been performed with the computer codes SUPERFISH and MAFIA. Analytical calculations for a bi-periodic accelerating structure with full end cells including direct coupling are presented. Equations giving the detuning of the chain mode frequencies for known individual cell er rors and coupling coefficients are derived. After numerical inversion these equations will be used for the final tuning of the cavity

Modulation of gamma and spindle-range power by slow oscillations in scalp EEG of children.

Deep sleep is characterized by slow waves of electrical activity in the cerebral cortex. They represent alternating down states and up states of, respectively, hyperpolarization with accompanying neuronal silence and depolarization during which neuronal firing resumes. The up states give rise to faster oscillations, notably spindles and gamma activity which appear to be of major importance to the role of sleep in brain function and cognition. Unfortunately, while spindles are easily detectable, gamma oscillations are of very small amplitude. No previous sleep study has succeeded in demonstrating modulations of gamma power along the time course of slow waves in human scalp EEG. As a consequence, progress in our understanding of the functional role of gamma modulation during sleep has been limited to animal studies and exceptional human studies, notably those of intracranial recordings in epileptic patients.Because high synaptic density, which peaks some time before puberty depending on the brain region (Huttenlocher and Dabholkar, 1997), generates oscillations of larger amplitude, we considered that the best chance to demonstrate a modulation of gamma power by slow wave phase in regular scalp sleep EEG would be in school-aged children. Sleep EEG was recorded in 30 healthy children (aged 10.7. ±. 0.8. years; mean. ±. s.d.). Time-frequency analysis was applied to evaluate the time course of spectral power along the development of a slow wave. Moreover, we attempted to modify sleep architecture and sleep characteristics through automated acoustic stimulation coupled to the occurrence of slow waves in one subset of the children.Gamma power increased on the rising slope and positive peak of the slow wave. Gamma and spindle activity is strongly suppressed during the negative peak. There were no differences between the groups who received and did not receive acoustic stimulation in the sleep parameters and slow wave-locked time-frequency analysis. Our findings show, for the first time in scalp EEG in humans, that gamma activity is associated with the up-going slope and peak of the slow wave. We propose that studies in children provide a uniquely feasible opportunity to conduct investigations into the role of gamma during sleep. © 2013 Elsevier B.V

Kleine uitbreiding recreatieplas Cattenbroek, gemeente Woerden; archeologisch vooronderzoek: een bureau- en inventariserend veldonderzoek (karterende fase)

Coordinaten:De RD-coördinaat (XY) van het meest noordelijke punt van het plangebied is circa 123.326/455.711 en van het meest zuidelijke circa 123.536/455.363 Datum einde onderzoek: augustus 2009, rapportage: 5 oktober 2009 Projectmedewerkers:drs. J.E. van Eijk & J. van Roemburg BA Complextype(n):xxx Datering:NEO- LME Diversen:Coppens, C.F.H., Kleine uitbreiding recreatieplas Cattenbroek, gemeente Woerden; archeologisch vooronderzoek: een bureau- en inventariserend veldonderzoek (karterende fase), RAAPrapport2011 (WEESP, 2009) In verband met voorgenomen graafwerkzaamheden, die eventueel aanwezige archeologische waarden zouden kunnen verstoren, voert RAAP een archeologisch vooronderzoek uit