Guide Vanes for Deflecting Fluid Currents with Small Loss of Energy

The transverse momentum of the deflected air stream to be absorbed is divided between the intermediate and outside walls, so that the pressure increase on each wall is much smaller and the danger of separation is diminished. The formation of secondary vortices is also diminished. By taking as the basis profiles with high c(sub a), such as have proved practically favorable, it is not possible to find a satisfactory form of grid simply on the assumption that the flow is potential. The requirements called for the most uniform possible velocity distribution behind the bend and the smallest possible losses

Wie presentie zaait zal presentie oogsten

__Abstract__ Wat is presentie? Presentie beoefenaren gaan een relatie aan met mensen die zorg en steun nodig hebben. Het draait in presentie om attentie en aandacht. Zorgorganisaties ontberen presentie, zo leren we wanneer wij in het ziekenhuis of verpleeghuis terecht komen. De presentietheorie (Baart, 2004) is een kritische reflectie hierop, de kritiek van de distantiëring. Distantiëring is gedrag dat tegenovergesteld is aan presentie. Hoe kunnen we de disbalans tussen afstand en nabijheid in de zorg herstellen

Experimental Investigation of Aircraft Propellers Exposed to Oblique Air Currents

Two screw propellers, a normal airplane propeller with a pitch/diameter ratio H/D = 0.5 and a helicopter propeller H/D = 0.2 were tested in the large wind tunnel of the Gottigen Aerodynamic Institute. With both propellers the angle between the propeller axis and the direction of the wind was varied from 0 to 90 degrees. In addition to the three force and the three moment components in a wind-fast coordinate system, the corresponding components in a propeller-fast coordinate system, a total of six force and six moment components, together with the propulsive efficiency, were measured or calculated from measurements. The results are given in the form of diagrams and briefly discussed. The propeller models and method of experimentation are described and the symbols are defined

ERMITTLUNG DER WIRTSCHAFTLICHKEIT DES ENERGIEHOLZANBAUS IN KURZUMTRIEBSPLANTAGEN – RISIKOANALYSE MIT HILFE DER MONTE-CARLO-SIMULATION

In jüngerer Zeit hat sich die Rolle der Landwirtschaft deutlich gewandelt. Neben der Erzeugung von hochwertigen Nahrungsmitteln stellt für einen Großteil der Branche der Anbau von Energiepflanzen zur Rohstoffgewinnung ein weiteres wichtiges Standbein in der landwirtschaftlichen Produktion dar. Ein Beispiel ist unter anderem die Erzeugung von Holzbiomasse auf landwirtschaftlichen Flächen in Form des Anbaus von schnellwachsenden Baumarten. Eine anhand von Literaturdaten durchgeführte Risikoanalyse der Wirtschaftlichkeit des Anbaus von schnellwachsenden Baumarten in Kurzumtriebsplantagen mittels Monte-Carlo-Simulation zeigt, dass dieser momentan für sich betrachtet zwar in der Mehrzahl der Fälle wirtschaftlich ist, verglichen mit um die Anbaufläche konkurrierenden Marktfrüchten allerdings kaum bestehen kann. Daher wird es schwierig sein, ohne flankierende Maßnahmen Landwirte zu animieren, ihren Beitrag zur Deckung des zukünftigen Biomassebedarfs zur Energieerzeugung durch die Holzproduktion auf landwirtschaftlichen Flächen zu leisten.Risikoanalyse, Monte-Carlo-Simulation, Wirtschaftlichkeit, Kurzumtriebsplantage, Production Economics, Productivity Analysis, Risk and Uncertainty,

Use of a Semi-field System to Evaluate the Efficacy of Topical Repellents under user Conditions Provides a Disease Exposure free Technique Comparable with Field Data.

Before topical repellents can be employed as interventions against arthropod bites, their efficacy must be established. Currently, laboratory or field tests, using human volunteers, are the main methods used for assessing the efficacy of topical repellents. However, laboratory tests are not representative of real life conditions under which repellents are used and field-testing potentially exposes human volunteers to disease. There is, therefore, a need to develop methods to test efficacy of repellents under real life conditions while minimizing volunteer exposure to disease. A lotion-based, 15% N, N-Diethyl-3-methylbenzamide (DEET) repellent and 15% DEET in ethanol were compared to a placebo lotion in a 200 sq m (10 m x 20 m) semi-field system (SFS) against laboratory-reared Anopheles arabiensis mosquitoes and in full field settings against wild malaria vectors and nuisance-biting mosquitoes. The average percentage protection against biting mosquitoes over four hours in the SFS and field setting was determined. A Poisson regression model was then used to determine relative risk of being bitten when wearing either of these repellents compared to the placebo. Average percentage protection of the lotion-based 15% DEET repellent after four hours of mosquito collection was 82.13% (95% CI 75.94-88.82) in the semi-field experiments and 85.10% (95% CI 78.97-91.70) in the field experiments. Average percentage protection of 15% DEET in ethanol after four hours was 71.29% (CI 61.77-82.28) in the semi-field system and 88.24% (84.45-92.20) in the field. Semi-field evaluation results were comparable to full-field evaluations, indicating that such systems could be satisfactorily used in measuring efficacy of topically applied mosquito repellents, thereby avoiding risks of exposure to mosquito-borne pathogens, associated with field testing

Results of the Cooperative Uniform Soybean Tests, 1948 Part I. North Central States

United States Department of Agriculture, Agricultural Research Administration; Bureau of Plant Industry, Soils, and Agricultural Engineering, Division of Forage Crops and Diseases Cooperating with State Agricultural Experiment Station

Results of the Cooperative Uniform Soybean Tests, 1947 Part I. North Central States

United States Department of Agriculture, Agricultural Research Administration; Bureau of Plant Industry, Soils, and Agricultural Engineering, Division of Forage Crops and Diseases Cooperating with State Agricultural Experiment Station

Results of the Cooperative Uniform Soybean Tests, 1946 Part I. North Central States

United States Department of Agriculture, Agricultural Research Administration; Bureau of Plant Industry, Soils, and Agricultural Engineering, Division of Forage Crops and Diseases Cooperating with State Agricultural Experiment Station

Results of the Cooperative Uniform Soybean Tests, 1945. Part I. North Central States

United States Department of Agriculture Agricultural Research Administration Bureau of Plant Industry, Soils, and Agricultural Engineering, Division of Forage Crops and Diseases Cooperating with State Agricultural Experiment Station