This work assesses the feasibility of the planar PIV technique to study the characteristics of a siloxane vapor D4. Titanium dioxide (TiO2) seeding particles were used to track the motion around a rotating disk in a low speed flow. Vector fields of natural convection (NC) and a superposition of NC and rotating flow were selected as exemplary cases. The particles were capable of tracing the flow since the calculated Stokes number St is . The quality of the experimental data is assessed by means of particle seeding density and particle image Signal to Noise ratio (S/N). The final results are deemed acceptable for an accurate assessment of the flow field. Rejected outliers are below 2.3% and the relative uncertainties corresponding to the average velocity fields are below 1%.
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Restoration of walking capacity, as reflected by walking speed and walking distance, is a primary goal after stroke. Peak aerobic capacity (peak oxygen consumption [V̇O2peak]) is suggested to be correlated with walking capacity after stroke. Although the strength of this correlation is unclear, physical therapy programs often target walking capacity by means of aerobic training. Purpose The purpose of this systematic review was to summarize the available evidence on the correlation between V̇O2peak and walking capacity. Data Sources The databases MEDLINE, CINAHL, EMBASE, Cochrane Library, and SPORTDiscus were searched up to May 2014. Study Selection Cross-sectional studies reporting correlation coefficients between V̇O2peak and walking capacity in stroke were included, along with longitudinal studies reporting these correlation coefficients at baseline. Data Extraction The methodological quality of the studies was assessed using a checklist of 27 items for observational research. Information on study design, stroke severity and recovery, and assessments and outcome of V̇O2peak and walking capacity, as well as the reported correlation coefficients, were extracted. Data Synthesis Thirteen studies involving 454 participants were included. Meta-analyses showed combined correlation coefficients (rɱ) for V̇O2peak and walking speed and for V̇O2peak and walking distance of .42 (95% credibility interval=.31, .54) and .52 (95% credibility interval=.42, .62), respectively. Limitations The studies included in the present review had small sample sizes and low methodological quality. Clinical and methodological diversity challenged the comparability of the included studies, despite statistical homogeneity. Relevant data of 3 studies could not be retrieved. Conclusions The strength of the correlation of V̇O2peak with walking speed was low and moderate for V̇O2peak and walking distance, respectively, indicating that other factors, besides V̇O2peak, determine walking capacity after stroke.
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Electromagnetic articulography (EMA) is one of the instrumental phonetic research methods used for recording and assessing articulatory movements. Usually, articulographic data are analysed together with standard audio recordings. This paper, however, demonstrates how coupling the articulograph with devices providing other types of information may be used in more advanced speech research. A novel measurement system is presented that consists of the AG 500 electromagnetic articulograph, a 16-channel microphone array with a dedicated audio recorder and a video module consisting of 3 high-speed cameras. It is argued that synchronization of all these devices allows for comparative analyses of results obtained with the three components. To complement the description of the system, the article presents innovative data analysis techniques developed by the authors as well as preliminary results of the system’s accuracy.
In the context of global efforts to increase sustainability and reduce CO2 emissions in the chemical industry, bio-based materials are receiving increasing attention as renewable alternatives to petroleum-based polymers. In this regard, Visolis has developed a bio-based platform centered around the efficient conversion of plant-derived sugars to mevalonolactone (MVL) via microbial fermentation. Subsequently, MVL is thermochemically converted to bio-monomers such as isoprene and 3-methyl-1,5-pentane diol, which are ultimately used in the production of polymer materials. Currently, the Visolis process has been optimized to use high-purity, industrial dextrose (glucose) as feedstock for their fermentation process. Dutch Sustainable Development (DSD) has developed a direct processing technology in which sugar beets are used for fermentation without first having to go through sugar extraction and refinery. The main exponent of this technology is their patented Betaprocess, in which the sugar beet is essentially exposed to heat and a mild vacuum explosion, opening the cell walls and releasing the sugar content. This Betaprocess has the potential to speed up current fermentation processes and lower feedstock-related costs. The aim of this project is to combine aforementioned technologies to enable the production of mevalonolactone using sucrose, present in crude sugar beet bray after Betaprocessing. To this end, Zuyd University of Applied Sciences (Zuyd) intends to collaborate with Visolis and DSD. Zuyd will utilize its experience in both (bio)chemical engineering and fermentation to optimize the process from sugar beet (pre)treatment to product recovery. Visolis and DSD will contribute their expertise in microbial engineering and low-cost sugar production. During this collaboration, students and professionals will work together at the Chemelot Innovation and Learning Labs (CHILL) on the Brightlands campus in Geleen. This collaboration will not only stimulate innovation and sustainable chemistry, but also provides starting professionals with valuable experience in this expanding field.
Agricultural/horticultural products account for 9% of Dutch gross domestic product. Yearly expansion of production involves major challenges concerning labour costs and plant health control. For growers, one of the most urgent problems is pest detection, as pests cause up to 10% harvest loss, while the use of chemicals is increasingly prohibited. For consumers, food safety is increasingly important. A potential solution for both challenges is frequent and automated pest monitoring. Although technological developments such as propeller-based drones and robotic arms are in full swing, these are not suitable for vertical horticulture (e.g. tomatoes, cucumbers). A better solution for less labour intensive pest detection in vertical crop horticulture, is a bio-inspired FW-MAV: Flapping Wings Micro Aerial Vehicle. Within this project we will develop tiny FW-MAVs inspired by insect agility, with high manoeuvrability for close plant inspection, even through leaves without damage. This project focusses on technical design, testing and prototyping of FW-MAV and on autonomous flight through vertically growing crops in greenhouses. The three biggest technical challenges for FW-MAV development are: 1) size, lower flight speed and hovering; 2) Flight time; and 3) Energy efficiency. The greenhouse environment and pest detection functionality pose additional challenges such as autonomous flight, high manoeuvrability, vertical take-off/landing, payload of sensors and other equipment. All of this is a multidisciplinary challenge requiring cross-domain collaboration between several partners, such as growers, biologists, entomologists and engineers with expertise in robotics, mechanics, aerodynamics, electronics, etc. In this project a co-creation based collaboration is established with all stakeholders involved, integrating technical and biological aspects.
Uit de ongevallenstatistieken blijkt dat ouderen verhoudingsgewijs vaker betrokken zijn bij verkeersongevallen en vaker de veroorzaker van een ongeval zijn. Ze worden daarom als risicogroep in het verkeer aangeduid. Diverse eerder uitgevoerde onderzoeken verwachten dat rijhulpsystemen, de zogenoemde ‘Advanced Driver Assistance Systems’ (ADAS) het verhoogde ongevalsrisico van de oudere autobestuurder kan verlagen. Toch blijkt uit voorgaand onderzoek dat deze ADAS, die generiek ontwikkeld worden voor een universele gebruiker, juist bij oudere automobilist nog niet goed aanslaan en de potentie van een doelgroepgerichte ADAS voor ouderen niet optimaal benut wordt. De technische mogelijkheden om ouderen te ondersteunen bestaan al, maar het ontbreekt op dit moment nog aan praktische toepassingen. In BRAVO staat een doelgroepgerichte ADAS voor ouderen centraal en zullen de marktmogelijkheden samen met de mkb-partners onderzocht worden. Dit onderzoek vraagt om een multidisciplinaire benadering van zowel de problematiek, de huidige markt als de behoeften van de consument/doelgroep. BRAVO zal resulteren in een businesscase die scenario’s bevat waarin een doelgroepgerichte ADAS voor ouderen kan worden toegepast. Daarnaast zal dit verkennende onderzoek nieuwe inzichten geven die zullen leiden tot nieuwe (en grotere) onderzoeken naar het effect en de impact van een doelgroepgerichte ADAS voor ouderen. Met BRAVO wordt een eerste stap gezet naar de ontwikkeling van een doelgroepgerichte ADAS die kan bijdragen aan de verkeersveiligheid en het zelfstandige mobiliteitsbelang van de oudere bestuurder.
