Landessortenversuche Ökologischer Landbau 2011 Wintergetreide, Sommergetreide, Leguminosen, Kartoffeln

Der Bericht enthält Ertrags- und Qualitätsdaten von Sortenversuchen verschiedener Fruchtarten des Erntejahres 2011 des Anbaugebietes 1 Sandstandorte Nordost mit Ergebnissen der Bundeslaänder Mecklenburg-Vorpommern, Brandenburg, Schleswig-Holstein, Niedersachsen und Sachsen-Anhalt

Verbesserung der überregionalen Sortenauswertung im ökologischen Landbau mit Hilfe der Hohenheimer-Gülzower Methode am Beispiel der Körnererbsen

A reduced extent of variety trials in organic agriculture makes a regional recommenda-tion more difficult. The Hohenheim-Gülzower method was developed for the evalua-tion of the conventional national variety trials in the states of the Federal Republic. This method should optimize the interpretation of test results in organic agriculture, too. Problems are shown by example of variety trials with grain peas. The new method enabled the representation of results by regionalization and weighed inclusion of adjacent regions

Landessortenversuche Ökologischer Landbau 2009 Mecklenburg-Vorpommern - Getreide, Körnerleguminosen, Kartoffeln

Der Bericht enthält Ertrags- und Qualitätsergebnisse 2009 und mehrjährig aus Öko-Versuchen vom Standort Gülzow und angrenzender Standorte mit sandigen Böden der Bundesländer Schleswig-Holstein, Niedersachsen, Sachsen-Anhalt und Brandenburg

Regulation of Wages and Hours Prior to 1938

Direct numerical simulations are performed to investigate the transient upstream propagation (flashback) of premixed hydrogen–air flames in the boundary layer of a fully developed turbulent channel flow. Results show that the well-known near-wall velocity fluctuations pattern found in turbulent boundary layers triggers wrinkling of the initially flat flame sheet as it starts propagating against the main flow direction, and that the structure of the characteristic streaks of the turbulent boundary layer ultimately has an important impact on the resulting flame shape and on its propagation mechanism. It is observed that the leading edges of the upstream-propagating premixed flame are always located in the near-wall region of the channel and assume the shape of several smooth, curved bulges propagating upstream side by side in the spanwise direction and convex towards the reactant side of the flame. These leading-edge flame bulges are separated by thin regions of spiky flame cusps pointing towards the product side at the trailing edges of the flame. Analysis of the instantaneous velocity fields clearly reveals the existence, on the reactant side of the flame sheet, of backflow pockets that extend well above the wall-quenching distance. There is a strong correspondence between each of the backflow pockets and a leading edge convex flame bulge. Likewise, high-speed streaks of fast flowing fluid are found to be always colocated with the spiky flame cusps pointing towards the product side of the flame. It is suggested that the origin of the formation of the backflow pockets, along with the subsequent mutual feedback mechanism, is due to the interaction of the approaching streaky turbulent flow pattern with the Darrieus–Landau hydrodynamic instability and pressure fluctuations triggered by the flame sheet. Moreover, the presence of the backflow pockets, coupled with the associated hydrodynamic instability and pressure–flow field interaction, greatly facilitate flame propagation in turbulent boundary layers and ultimately results in high flashback velocities that increase proportionately with pressure

Anpassung der regionalisierten Versuchsauswertung mit überlappenden Anbaugebieten für Sortenversuche im ökologischen Landbau

Der in den meisten Bundesländern eingeschränkte Umfang an Sortenversuchen im ökologi-schen Landbau erschwert eine regionale Sortenempfehlung. Die vielfach geringere Ver-suchspräzision in diesen Anbausystemen verschärft das Problem, welches in häufig hohen Standardfehlern und großen Grenzdifferenzen seinen Ausdruck findet. Daher war es erforderlich auch für die Auswertung der Sortenversuche im ökologischen Landbau Anbaugebiete zu bilden und eine überregionale Auswertung unter Einbeziehung der Ergebnisse benachbarter Anbaugebiete vorzunehmen. Ein weiterer Schritt war die Einführung der Hohenheim-Gülzower Serienauswertung. Mit Hilfe der Regionalisierung und gegebenenfalls gewichteten Einbeziehung von Versuchsergebnissen angrenzender Gebiete (Überlappung) kann die Ertragsschätzung und Sortenempfehlung verbessert werden

Landessortenversuche 2008: Wintergetreide, Sommergetreide, Körnerleguminosen, Kartoffeln

Der Bericht enthält die Ergebnisse der unter ökologischen Bedingungen durchgeführten Sortenversuche in Mecklenburg-Vorpommern. Darüber hinaus werden Ergebnisse von Öko-Standorten angrenzender Bundesländer zu einer Anbauregion regionalisiert und die Erträge aller Standorte nach der Methode der Hohenheim-Gülzower Serienauswertung verrechnet. Der Bericht enthält neben dem Ertrag Angaben zum Auftreten von Krankheiten und zur Qualität

Blaue Süßlupine- wichtige Körnerleguminose im Öko-Landbau

Die Bedeutung von Körnerleguminosen nimmt auch im Öko-Landbau bundesweit ab. Immer mehr Praktiker ersetzen sie durch Futterleguminosen oder nicht legume Arten. Eine Praxisanalyse in Mecklenburg-Vorpommern zeigt, dass große Ertragsschwankungen, hohe Saatgutkosten,starker Krankheits- und Schädlingsdruck sowie Verunkrautung Hauptgründe für diese Entwicklung sind. Die Analyse zeigte große Unterschiede im Anbauverfahren. Wichtige Aspekte zur Verfahrensgestaltung werden aufgeführt

HIFiRE Direct-Connect Rig (HDCR) Phase I Scramjet Test Results from the NASA Langley Arc-Heated Scramjet Test Facility

A series of hydrocarbon-fueled direct-connect scramjet ground tests has been completed in the NASA Langley Arc-Heated Scramjet Test Facility (AHSTF) at simulated Mach 8 flight conditions. These experiments were part of an initial test phase to support Flight 2 of the Hypersonic International Flight Research Experimentation (HIFiRE) Program. In this flight experiment, a hydrocarbon-fueled scramjet is intended to demonstrate transition from dual-mode to scramjet-mode operation and verify the scramjet performance prediction and design tools A performance goal is the achievement of a combusted fuel equivalence ratio greater than 0.7 while in scramjet mode. The ground test rig, designated the HIFiRE Direct Connect Rig (HDCR), is a full-scale, heat sink test article that duplicates both the flowpath lines and a majority of the instrumentation layout of the isolator and combustor portion of the flight test hardware. The primary objectives of the HDCR Phase I tests were to verify the operability of the HIFiRE isolator/combustor across the simulated Mach 6-8 flight regime and to establish a fuel distribution schedule to ensure a successful mode transition. Both of these objectives were achieved prior to the HiFIRE Flight 2 payload Critical Design Review. Mach 8 ground test results are presented in this report, including flowpath surface pressure distributions that demonstrate the operation of the flowpath in scramjet-mode over a small range of test conditions around the nominal Mach 8 simulation, as well as over a range of fuel equivalence ratios. Flowpath analysis using ground test data is presented elsewhere; however, limited comparisons with analytical predictions suggest that both scramjet-mode operation and the combustion performance objective are achieved at Mach 8 conditions

Combustor Operability and Performance Verification for HIFiRE Flight 2

As part of the Hypersonic International Flight Research Experimentation (HIFiRE) Direct-Connect Rig (HDCR) test and analysis activity, three-dimensional computational fluid dynamics (CFD) simulations were performed using two Reynolds-Averaged Navier Stokes solvers. Measurements obtained from ground testing in the NASA Langley Arc-Heated Scramjet Test Facility (AHSTF) were used to specify inflow conditions for the simulations and combustor data from four representative tests were used as benchmarks. Test cases at simulated flight enthalpies of Mach 5.84, 6.5, 7.5, and 8.0 were analyzed. Modeling parameters (e.g., turbulent Schmidt number and compressibility treatment) were tuned such that the CFD results closely matched the experimental results. The tuned modeling parameters were used to establish a standard practice in HIFiRE combustor analysis. Combustor performance and operating mode were examined and were found to meet or exceed the objectives of the HIFiRE Flight 2 experiment. In addition, the calibrated CFD tools were then applied to make predictions of combustor operation and performance for the flight configuration and to aid in understanding the impacts of ground and flight uncertainties on combustor operation

Vergleich von Weizensorten aus ökologischer und konventioneller Züchtung auf Standorten im Nordosten

Weizenanbau erfolgt im Nordosten überwiegend auf sandigen und trockenen Standorten. Erträge und Qualitäten sind daher nicht immer zufriedenstellend. Ziel der sekundären Auswertung von Sortenversuchen war der Vergleich ausgewählter Sorten aus ökologischer und konventioneller Züchtung in Bezug auf Ertrag und Qualität. Die Ergebnisse zeigen, dass Sorten aus ökologischer Züchtung bei leicht geringeren Erträgen und ähnlichen Rohproteingehalten wie konventionelle Züchtungen meist höhere Feuchtklebergehalte erreichen