Herstel Grote stuifzanden : verslag veldwerkplaats Droog zandlandschap Loonse en Drunense Duinen, 24 juni 2009

Welke functies wil je toekennen aan stuifzandgebied? Wil je er een natuurgebied gericht op de pioniersstadia met lichenensteppes en zo min mogelijk verstoring? Of wil je een gebied voor recreanten en wil je net zoals hier in de Loonse en Drunense duinen anderhalf miljoen mensen per jaar kunnen opvangen? Of is het doel om er een soort geo-park van te maken om het stuifzandlandschap te kunnen bewaren

Atmospheric nitrogen deposition in terrestrial ecosystems:Its impact on plant communities and consequences across trophic levels

The global nitrogen cycle has been greatly perturbed by human activities resulting in elevated nitrogen deposition in many parts of the world. The threat nitrogen deposition poses to ecosystem function and biodiversity is increasingly recognised. In terrestrial systems, impacts on the plant community are mainly through eutrophication and soil acidification. Interactions with secondary environmental drivers such as extreme weather and disease are also key mechanisms. Impacts on consumers can be caused by changes in the quality or quantity of food as a result of changes in food plant chemistry or species composition, changes in vegetation structure leading to a change in the availability of prey species, nesting sites or cooled microclimates or changes in the phenology of plants leading to causing phenological asynchrony. Primary consumers have received considerably less research attention than plants but negative impacts have been observed for both folivorous insects and pollinators. Mammal herbivores have received little research attention. New analysis of changes in plant traits along a gradient of nitrogen deposition in the UK shows that plants pollinated by large bees were negatively associated with N deposition whilst low pH was associated with lower nectar production, reduced occurrence of plants pollinated by long-tongued insects and a reduction in plants with larger floral units. Very few studies have investigated the effects on secondary consumers, but those that have suggest that there are likely to be negative impacts. This review identifies considerable knowledge gaps in the impacts of N deposition on higher tropic levels and highlights that for many groups, knowledge of N deposition impacts is patchy at best. Evidence that has been collected suggests that there are likely to be impacts on primary and secondary consumers making this a priority area for investigation

Violence Defied? A Review of Prevention of Violence in the Public and Semi-public Domain

This report provides a synthesis of 48 studies of the effects of the prevention of violence in the public and semi-public domain

Branden als EGM-maatregel

Periodiek branden is een traditionele gebruiks- of beheermethode die in het verleden op meerdere plaatsen werd toegepast. Dit gebeurde met name in heideterreinen en soms in duingraslanden, om de vegetatie te verjongen en de opslag van struiken en bomen tegen te gaan. geleidelijk is de beheersmethode uit het zicht verdwenen. In dit rapport zijn de ervaringen met periodiek branden en de kennis die er in binnenland en buitenland is over de effecten op de beschikbaarheid van nutriënten, vegetatie en fauna op een rij gezet. Het rapport geeft aan in welke situaties branden een aantrekkelijke effectgerichte maatregel kan zijn. In dit onderzoek (in het kader van OBN) werkten samen: Stichting Bargerveen, Bware en Alterr

Flexible constrained sampling with guarantees for pattern mining

Pattern sampling has been proposed as a potential solution to the infamous pattern explosion. Instead of enumerating all patterns that satisfy the constraints, individual patterns are sampled proportional to a given quality measure. Several sampling algorithms have been proposed, but each of them has its limitations when it comes to 1) flexibility in terms of quality measures and constraints that can be used, and/or 2) guarantees with respect to sampling accuracy. We therefore present Flexics, the first flexible pattern sampler that supports a broad class of quality measures and constraints, while providing strong guarantees regarding sampling accuracy. To achieve this, we leverage the perspective on pattern mining as a constraint satisfaction problem and build upon the latest advances in sampling solutions in SAT as well as existing pattern mining algorithms. Furthermore, the proposed algorithm is applicable to a variety of pattern languages, which allows us to introduce and tackle the novel task of sampling sets of patterns. We introduce and empirically evaluate two variants of Flexics: 1) a generic variant that addresses the well-known itemset sampling task and the novel pattern set sampling task as well as a wide range of expressive constraints within these tasks, and 2) a specialized variant that exploits existing frequent itemset techniques to achieve substantial speed-ups. Experiments show that Flexics is both accurate and efficient, making it a useful tool for pattern-based data exploration.Comment: Accepted for publication in Data Mining & Knowledge Discovery journal (ECML/PKDD 2017 journal track

Effects of Physical Exercise Training on Cerebral Blood Flow Measurements:A Systematic Review of Human Intervention Studies

The aim of this systematic review was to examine the effects of physical exercise training on cerebral blood flow (CBF), which is a physiological marker of cerebrovascular function. Relationships between training-induced effects on CBF with changes in cognitive performance were also discussed. A systematic search was performed up to July 2022. Forty-five intervention studies with experimental, quasi-experimental, or pre-post designs were included. Sixteen studies (median duration: 14 weeks) investigated effects of physical exercise training on CBF markers using magnetic resonance imaging, 20 studies (median duration: 14 weeks) used transcranial Doppler ultrasound, and eight studies (median duration: 8 weeks) used near-infrared spectroscopy. Studies using magnetic resonance imaging observed consistent increases in CBF in the anterior cingulate cortex and hippocampus, but not in whole-brain CBF. Effects on resting CBF-measured with transcranial Doppler ultrasound and near-infrared spectroscopy-were variable, while middle cerebral artery blood flow velocity increased in some studies following exercise or hypercapnic stimuli. Interestingly, concomitant changes in physical fitness and regional CBF were observed, while a relation between training-induced effects on CBF and cognitive performance was evident. In conclusion, exercise training improved cerebrovascular function because regional CBF was changed. Studies are however still needed to establish whether exercise-induced improvements in CBF are sustained over longer periods of time and underlie the observed beneficial effects on cognitive performance.</p

Development of an intervention aimed at increasing awareness and acknowledgement of victimisation and its consequences among people with severe mental illness

Individuals with severe mental illness have a significant risk of (anticipated) discrimination and (criminal) victimisation, which is not structurally and systematically addressed by mental health practitioners. The aim of this study was to develop and pilot an intervention which supports professionals to address victimisation and its consequences, in order to reinforce safe social participation and improve recovery. Following the rehabilitation and positive risk management literature, in addition to current practice, intervention components were developed in two focus groups and four subsequent expert meetings. The intervention was piloted in two outpatient teams before being finalised. The Victoria intervention includes positive risk management, focusing on clients’ narratives and strengths, and awareness of unsafe (home) environments: it comprises four steps: exploring issues with social participation, analysing victimisation experiences, clarifying the context of these experiences, and determining future steps, including victimisation-sensitive rehabilitation planning and optional trauma treatment. Future research should further test this intervention

Addressing victimization to enable societal participation in flexible assertive community treatment:A process evaluation of the implementation of a new intervention

BACKGROUND: Individuals with severe mental illness experience more victimization and discrimination than other persons in the community. Effective rehabilitation and recovery-oriented care interventions aimed at addressing this issue are lacking. We therefore developed a victimization-informed intervention (accompanied by a training module for professionals) called the Victoria intervention. The purpose of the present study was to understand the trial effects by examining the implementation process and the factors that influenced it. MATERIALS AND METHODS: A process evaluation was conducted using a mixed-methods design. During the professionals’ intervision sessions, we used observations to understand the learning processes (n = 25). Subsequently, we studied the use of the intervention in practice through structured questionnaires (n = 215) and semi-structured interviews (n = 34) with clients and professionals. We used descriptive and inferential statistics for the quantitative data and the framework method for the analyses of the qualitative data. RESULTS: The observations showed that the trainings were well received. The professionals shared the urgency of paying attention to victimization and discrimination and its harmful effects on participation. They also found the intervention steps to be logical and the intervention protocol easy to use. Nevertheless, they mentioned in the interviews that they had experienced difficulties initiating a conversation about victimization, and if they started one, they did not always follow the steps of the intervention as intended. Few clients said that victimization was placed on the agenda, though those who had discussed victimization with their caregivers expressed their appreciation in the interviews; they felt acknowledged and supported. DISCUSSION: The findings indicate that the intervention was considered helpful in raising awareness and the acknowledgment of victimization. However, professionals remain reluctant to talk about the subject, and the results show they need more practical training in this regard. This process evaluation has an important added value in that it helps us to understand the results of the effect evaluation of the intervention. The findings will facilitate the development and implementation of interventions that address clients’ victimization experiences in community mental healthcare settings and subsequently enable their participation in society

Mogelijkheden voor verder herstel van fauna in rivieruiterwaarden

In het Nederlandse rivierengebied zijn de afgelopen decennia veel natuurontwikkelingsprojecten uitgevoerd, geïnspireerd door Plan Ooievaar. Er zijn voor de fauna zeker successen te melden, maar sommige soorten hebben het nog steeds zeer moeilijk of zijn nog niet teruggekeerd. In dit artikel beschrijven we een analyse van de belangrijkste knelpunten voor karakteristieke terrestrische en amfibische fauna in het rivierengebied. Daarnaast worden de mogelijkheden verkend voor het opheffen van deze knelpunten