1,118 research outputs found
Measurements of turbulence at stratocumulus top
No full textUsing 1m resolution airborne data from research flights we divide stratocumulus top region into sublayers and characterize properties of turbulence in each sublayer. Results indicate, that there are no clear differences of turbulence properties between thermodynamically different "calassical" and "non-classical" stratocumulus regimes, but there are clear signs of turbulence ainsotropy in stably stratified sublayers in the cloud top region
Testing the delivery of conservation schemes for farmland birds at the farm-scale during winter, in Southern lowland England
No full textMany farmland bird species across Europe have continued to show population declines since the 1970s, as a result of agricultural intensification. A large number of conservation schemes and initiatives have emerged from Government and the food industry sector to address this problem. Some farmland bird populations are limited by overwintering survival. This paper compares winter farmland bird abundance and species richness from differing conservation schemes, including: Entry Level Stewardship (ELS), Conservation Grade (CG) and Organic farm management scenarios. Winter bird surveys were tailored to the farm-scale, reflecting the proportions of infield habitat arrangements of nine case study farms. Organic farms provided significantly less infield habitat types across all schemes and were dominated by grassland habitat. Entry Level Stewardship and CG schemes had larger proportions of winter bird food provisions and increased habitat heterogeneity. The results show granivorous passerines to be significantly more abundant on CG farms compared to Organic. Moreover, yellowhammers (Emberiza citronella L.) are specialist seed-eaters that were significantly less abundant on Organic farms, compared to ELS and CG. There were no significant differences for insectivorous passerines between schemes. A positive relationship between number of infield habitats and species richness on farms was found, with Organic farms scoring the lowest species richness. These results demonstrate a proof-of-concept that farm-scale management can have positive farm-scale effects for birds; with increasing habitat heterogeneity and the presence of winter bird food provisions. Interestingly, Organic farms are shown not to provide significant benefits to overwintering birds. This paper suggests that the CG scheme provides the best framework for farmers to achieve sufficient infield habitat arrangements to better overwintering farmland bird
Poissons d'eaux douces et saumâtres de basse Guinée, ouest de l'Afrique centrale : volume 2 = The fresh and brackish water fishes of lower Guinea, west-central Africa : volume 2
No full textApplication-oriented link adaptation for IEEE 802.11
No full textThe thesis addresses the ever-persistent problem of quality guarantees in wireless data networks. The quality guarantees are especially important for real-time streaming applications. While in fixed links most of the quality issues could be, and are still resolved by over-provisioning, in the world of wireless communications things get complicated. The main reason for wireless links being a bottleneck in terms of both achievable throughput and packet loss and delay guarantees, is the resource limitation that will always be there. Our work showed that while there is no magic solution that can resolve all link quality-related problems in wireless networks, a lot could be done to mitigate them. The first, and the most important, is to make the radio as adaptive to the changes of the link conditions as possible. This can be done through our advanced hybrid rate-control algorithm. The algorithm combines a stable throughput-based solution with a rapid link-quality feedback supplement into a novel controller that has both swift response and stable performance. The second solution, which is dependant on the first one, is the propagation of link status-related information from the link layer to the application. The latter can use this feedback to change its data stream properties to match those of the underlying wireless link. This behaviour proves most useful in cases when the radio cannot compensate for a deterioration of the radio connection such as a significant drop of the signal strength due to obstruction, or too many users competing to use the same medium.Electrical Engineering, Mathematics and Computer Scienc
Co-creatie in het publieke domein: Een vanzelfsprekendheid
No full textIndustrial DesignIndustrial Design Engineerin
Bubble velocity measurements using ultrasound
No full textApplied SciencesKramers Laboratorium voor Fysische Technologi
Experimental study on tranisitio characteristics of natural-concvection flow
No full textApplied Science
High temperature oxidation of ß-NiAICr model coating alloys: Effect of the reactive elements Y, Zr and Hf on growth and adhesion of the oxide layer
No full textMechanical, Maritime and Materials EngineeringTechnische Materiaalwetenschappe
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