Polderproject Woudse Droogmakerij: voorbeeldproject voor verbetering waterkwaliteit

Het Polderproject Woudse Droogmakerij moet leiden tot een meetbare verbetering van de waterkwaliteit met teeltmaatregelen die het rendement van de bedrijven garanderen of verbeteren. De kennis die ontstaat wordt landelijk ingezet om de emissie van gewasbeschermingsmiddelen en nutriënten vanuit de glastuinbouw te verminderen

Localized Lna Cooling in Vacuum

In the Square Kilometre Array (SKA) telescope [1], [2], the noise temperature of the first LNA must be reduced in order to reduce the necessary active area and the total system costs. Cooling the LNA locally would significantly decrease the noise figure but also the necessary power since not the whole system has to be cooled. For optimal thermal isolation, an LNA chip which only needs 6 bondwires has been chosen, 4 Ground and 2 signal wires. Biasing occurs on-chip. If the bondwires are 1.5mm long, the total heat conduction of the 6 bondwires is 31 mW, which is added to the power consumption of the LNA (30 mW). With a power of 61 mW to cool, the Peltier element can achieve a -T of 60K. With this system, a noise reduction of 30% has been measured with 0.5W of electrical power. For 15% noise reduction, only 35mW of electrical power was needed.Comment: Submitted on behalf of TIMA Editions (http://irevues.inist.fr/tima-editions

The impact of seeing and posting photos on mental health and body satisfaction:A panel study among Dutch and Japanese adolescents

A vivid scholarly debate addresses the extent to which social media usage is detrimental for adolescents’ mental health and body satisfaction. The current study aims to advance the debate in three ways: (1) we differentiate between different types of active and passive social media use (i.e., authentic vs. edited content), (2) we examine both between- and within-person results, and (3) we take a cross-national approach. Therefore, a three-wave panel study was conducted among 987 adolescents in Japan (N = 433) and the Netherlands (N = 554) to longitudinally investigate the relationships between active visual self-presentation, passive exposures thereto, and mental health and body satisfaction. Between-person results generally indicate that, regardless of being active or passive, both creating or seeing authentic content can be associated with increases in mental health and body satisfaction. Contrary, both creating and seeing edited content can coincide with reduced levels of mental health and body satisfaction. Nevertheless, the results should be seen in light of differences in between- and (lagged) within-person processes as well as cross-country differences. In all, evidence exemplifies the need for a communication-centered approach specifying content heterogeneity, showcases differences in between- and within-person effects, and demonstrates cross-national differential susceptibly to media effects

A collaborative tool for mobilizing knowledge in agrobiodiversity and the interface with climate change: the Platform for Agrobiodiversity Research

Poster presented at 2nd ANAFE International Symposium. Lilongwe (Malawi), Jul 200

Mid-frequency aperture arrays: the future of radio astronomy

Aperture array (AA) technology is at the forefront of new developments and discoveries in radio astronomy. Currently LOFAR is successfully demonstrating the capabilities of dense and sparse AA's at low frequencies. For the mid-frequencies, from 450 to 1450MHz, AA's still have to prove their scientific value with respect to the existing dish technology. Their large field-of-view and high flexibility puts them in an excellent position to do so. The Aperture Array Verification Program is dedicated to demonstrate the feasibility of AA's for science in general and SKA in particular. For the mid-frequency range this has lead to the development of EMBRACE, which has already demonstrated the enormous flexibility of AA systems by observing HI and a pulsar simultaneously. It also serves as a testbed to demonstrate the technological reliability and stability of AA's. The next step will put AA technology at a level where it can be used for cutting-edge science. In this paper we discuss the developments to move AA technology from an engineering activity to a fully science capable instrument. We present current results from EMBRACE, ongoing tests of the system, and plans for EMMA, the next step in mid-frequency AA technology.Comment: 8 pages, 7 figures, proceedings of Resolving The Sky - Radio Astronomy: Past, Present and Future (RTS2012), April 17-20, 2012, Manchester, U

Me, my selfie, and I:the relations between selfie behaviors, body image, self-objectification, and self-esteem in young women

Due to the enormous popularity of social networking sites (SNSs), online and offline social lives seem inextricably linked, which raises concerns for how SNS use relates to psychological health. Similarly, the omnipresence of selfies on SNSs—a form of appearance-related exposure—raises concerns regarding psychological health. This study aimed to investigate the relationships between body image, self-objectification, self-esteem, and various selfie behaviors among young women (N = 179). We hypothesized that a worsened body image (i.e., higher body dissatisfaction or lower body appreciation), higher levels of self-objectification, and lower self-esteem would precede greater engagement in selfie behaviors. Structural equation modeling showed that body appreciation is associated with greater engagement in selfie selection and deliberate posting, and that self-objectification is related to greater engagement in all selfie behaviors assessed. In support of our proposed model, a reversed model was also tested that showed poorer results. These findings suggest that body image may serve not only as an outcome of SNS use but also as a motive preceding selfie behaviors

Model-Based Decision Support for Protected Cultivation of Sweet Pepper

Abstract: A crop growth model for sweet pepper was applied to simulate quantity and timing of fruit set and harvest. Climate input for the model was organised by means of online data platforms, linking directly to climate computer sensors. This information was processed and made available as model-input automatically via an ftp-server. Additionally, regular registration of fruit set and harvest was routinely performed on a weekly basis at the companies and entered manually into online data platforms. The processed model-input for registration was made available via the same ftp-connection. The model was complemented with a user interface, allowing instant simulation of simple climate scenarios. This provided the grower with information on the consequences of changes in greenhouse climate for fruit set and harvest. Initially, model results were solely supplied through a partnership with a cultivation advisory firm, acquainting the grower with the possibilities of the model-application. Later in the project, experienced growers used the application locally, allowing them to use the tool more frequently as support in their decision making