1,128 research outputs found

    Seasonal changes in 24-h patterns of suicide rates:a study on train suicides in The Netherlands

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    Background: Annual patterns in suicide rates, peaking near the summer solstice, are well documented. It has been suggested that day length or total hours of sunshine has an impact on suicide rates. If these environmental factors are involved, we would expect changes in the daily pattern of suicide rates to occur over the year. To test this hypothesis, the 24-h patterns of suicide rate were investigated as a function of time of year. Method: Detailed information about the exact time of suicides in The Netherlands is only available for train suicides. Therefore, information concerning age, sex, time and place of occurrence of all verified train suicides over 15 years in The Netherlands (n = 2830) was obtained from The Netherlands Railways archives. Results: Daily patterns in train suicides show systematic variations of two kinds. First, independently of time of year, suicide rates at night drop to about 10% of their daytime values. Second. there are two daily peaks in the patterns which shift their timing over the year, with one peak occurring shortly after sunset, and the other one consistently occurring 9-10 h earlier. Both peaks shift with the 5.5-h shift in sunset time. Limitations: Train suicidal behaviour may not represent fatal suicidal behaviour in general. Conclusions: There are pronounced and systematic daily variations in train suicide rates in The Netherlands. One of these is related to clock time, the others are related to the light-dark cycle. The consistency of the patterns suggests a strong environmental influence on train suicidal behaviour. Research on 24-h patterns of suicide rates should control for time of year. (C) 2001 Elsevier Science B.V. All rights reserved

    What’s in a wave?

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    In western society, cardiovascular disease is one of the leading causes of death. An appropriate lifestyle and therapeutic interventions can delay the deterioration of cardiovascular disease. As a result, early detection of cardiovascular disease has received significant attention. Two of the oldest cardiovascular signals measured are blood pressure [1] and ECG [2]. These measures provide (non-) invasive estimates of cardiac and vascular function. With technical advances, the entire arterial blood pressure waveform (figure 1) became available to clinicians, allowing a major step forward in the recognition of cardiovascular disease. For example, the arterial blood pressure waveform allows for the determination of vascular stiffness, which has been shown to be an early predictor of the development of hypertension [3] and risk for myocardial infarction [4]. The arterial blood pressure waveform is also used in the early detection of shock [5, 6], guiding immediate treatment with the administration of fluids and/or vaso-active agents. Hence the evaluation of the arterial blood pressure waveform has become part of daily clinical practice

    Integration of DG in MV-grids: challenges encountered by the grid operator

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    A major part of decentralised production in the Netherlands consists of Combined Heat and Power-plants (CHP). Especially in the horticultural sector small CHP-plants with a maximum rating of 2,5 MW are applied. In these areas the CHP-plants are connected to the Medium voltage grid which leads to a high penetration level of CHP-plants. The Dutch law obliges grid operators to connect CHP-plants to the grid in 18 weeks, and prohibits long term transportation restrictions. When dealing with multiple CHP-connection in a grid the legal obligations conflict with planning permissions and project times. The presentation describes a scenario based method, which enables Stedin to plan the grid expansion pro-actively. In the presentation the results of the case study in the Oostland area are presented

    Landbouwkundige gevolgen peilverhoging in veenweidegebied = Agricultural consequences of level increase in low moor polder areas

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    In this study the effects of a renewed increase of a decreased ditch water level were considered. Increasing the ditch water level leads to decreased land subsidence, but also to less yield (6%) and more damage, or a more difficult grassland management. Damage calculated from earlier studies of 222 euro/ha immediately applies after level increas

    Martin Fleischmann memorial project - introduction and overview

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    PresentationThese slides support the oral presentation by Robert W. Greenyer and Tyler van Houwelingen: "Martin Fleischmann Memorial Project--Introduction and Overview"