Accreting millisecond X-ray pulsars: 10 years of INTEGRAL observations

During the last 10 years, INTEGRAL made a unique contribution to the study of accreting millisecond X-ray pulsars (AMXPs), discovering three of the 14 sources now known of this class. Besides increasing the number of known AMXPs, INTEGRAL also carried out observations of these objects above 20 keV, substantially advancing our understanding of their behaviour. We present here a review of all the AMXPs observed with INTEGRAL and discuss the physical interpretation of their behaviour in the X-ray domain. We focus in particular on the lightcurve profile during outburst, as well as the timing, spectral, and thermonuclear type-I X-ray bursts properties.Comment: 8 pages, 8 figures. Proceedings of "An INTEGRAL view of the high-energy sky (the first 10 years)" the 9th INTEGRAL Workshop, October 15-19, 2012, Paris, Franc

Voedzame vijvers: nieuwe stappen in de ontwikkeling van duurzame vijverteelt

In een nieuw gezamenlijk onderzoeksproject werken Wageningen University en Skretting-Nutreco aan het verduurzamen van vijverteelt door middel van de ontwikkeling van een nieuw voeder dat zowel het kweekdier als het gehele ecosysteem in de vijver voedt. De “natuurlijke productie” in de vijver wordt gestimuleerd waarbij een nieuwe bron van omega-3 vetzuren kan worden aangeboord en tegelijkertijd het voedselweb en natuurlijke waterzuivering worden versterkt. Het nieuwe voer kan wereldwijd worden ingezet in vijverteeltsystemen en heeft de potentie de aquacultuursector robuuster, duurzamer en kostenefficiënter te maken

Violence in Colombian and Cambodian Film: Truth, Past, and Memory

Documentaries and feature films are cinematic vehicles of visual art that are often symbolic representations of the social, political and cultural world in which they emerge. This thesis focuses on the analysis of violence that leads to genocide both in the case of the Khmer Rouge regime in Cambodia between 1975 and 1979 and the Colombian armed conflict between 1948 and 1957 through film. It explores the role of film and cinematic imagery in the formation of memories, reflections, interpretations and the dissemination of ideas. Through an analysis of a wide variety of viewpoints in documentaries and feature films, I show that the elements of knowledge of the past in each production depend heavily upon the manner in which the directors and characters within the films relate to the trauma and violence that has permanently transformed their memory. In the documentaries, various levels of personal connection to the violence of the past always produce subjective responses in the way in which individuals interpret and react to certain people, places and events. In feature films, representations of violence differ according to the story that is being told, the intentions of the directors, and the artistic devices that emphasize certain aspects of historical violence. The first main chapter of this thesis provides an analysis of the documentaries New Year Baby (2006), S-21: The Khmer Rouge Killing Machine (2003), and El Bogotazo: La historia de una ilusión (2008) in regards to themes such as trauma, testimony, preserving memory, constructing historical truth, forgiveness, and breaking silence. The first two documentaries address the effects of the Khmer Rouge violence through investigation and personal accounts of traumatic memory. The third details the events of April 9th, 1948 in Bogotá, Colombia as the start of the brutal period of violence in the nation called La Violencia. The second main chapter of this thesis analyzes the feature films The Killing Fields (1984) and Carne de tu carne (1983). It focuses on cinematic representations of historical violence through imagery and visual depictions of political, social, and personal viewpoints

COMPTEL solar flare observations

COMPTEL as part of a solar target of opportunity campaign observed the sun during the period of high solar activity from 7-15 Jun. 1991. Major flares were observed on 9 and 11 Jun. Although both flares were large GOES events (greater than or = X10), they were not extraordinary in terms of gamma-ray emission. Only the decay phase of the 15 Jun. flare was observed by COMPTEL. We report the preliminary analysis of data from these flares, including the first spectroscopic measurement of solar flare neutrons. The deuterium formation line at 2.223 MeV was present in both events and for at least the 9 Jun. event, was comparable to the flux in the nuclear line region of 4-8 MeV, consistent with Solar-Maximum Mission (SSM) Observations. A clear neutron signal was present in the flare of 9 Jun. with the spectrum extending up to 80 MeV and consistent in time with the emission of gamma-rays, confirming the utility of COMPTEL in measuring the solar neutron flux at low energies. The neutron flux below 100 MeV appears to be lower than that of the 3 Jun. 1982 flare by more than an order of magnitude. The neutron signal of the 11 Jun. event is under study. Severe dead time effects resulting from the intense thermal x-rays require significant corrections to the measured flux which increase the magnitude of the associated systematic uncertainties