Bremen-Nord: Chancen zur Neupositionierung nutzen! Zwischenbilanz - Perspektiven - Gesamtstrategie

Bremen-Nord nimmt innerhalb der Stadt Bremen auf Grund seiner Lage und industriellen Geschichte immer noch einen besonderen Stellenwert ein. Der wirtschaftliche Strukturwandel hat in diesem Stadtraum vielfältige Herausforderungen verursacht, die auch 20 Jahre nach Ende der Vulkanwerft und trotz vielfältiger politischer Willensbekundungen, Programme und Initiativen noch nicht nachhaltig bewältigt werden konnten. So konstatieren die Autoren des iaw auf Basis umfassender Analysen demografischer und sozioökonomischer Daten eine zunehmende Abkopplung der Entwicklung Bremen-Nords von der positiveren Entwicklung der Gesamtstadt und der Umlandgemeinden. Ferner ist eine starke sozialräumliche Segregation innerhalb und zwischen den Ortsteilen Bremen-Nords festzustellen. Die Problemlagen, die in vielschichtigen Wechselwirkungen miteinander stehen, machen einen umfassenden und integrierten Ansatz zur Entwicklung Bremen-Nords notwendig - vorhandene Ressourcen und Kräfte müssen dafür stärker als bislang harmonisiert und neue aktiviert werden! Daher wird die Einrichtung eines langfristig angelegten, mit ausreichend Ressourcen und Umsetzungskompetenzen unterlegten Strukturprogramms in neuen Organisationsstrukturen für Bremen-Nord angeregt

Desynchronization of pulse-coupled oscillators with delayed excitatory coupling

Collective behavior of pulse-coupled oscillators has been investigated widely. As an example of pulse-coupled networks, fireflies display many kinds of flashing patterns. Mirollo and Strogatz (1990) proposed a pulse-coupled oscillator model to explain the synchronization of South East Asian fireflies ({\itshape Pteroptyx malaccae}). However, transmission delays were not considered in their model. In fact, the presence of transmission delays can lead to desychronization. In this paper, pulse-coupled oscillator networks with delayed excitatory coupling are studied. Our main result is that under reasonable assumptions, pulse-coupled oscillator networks with delayed excitatory coupling can not achieve complete synchronization, which can explain why another species of fireflies ({\itshape Photinus pyralis}) rarely synchronizes flashing. Finally, two numerical simulations are given. In the first simulation, we illustrate that even if all the initial phases are very close to each other, there could still be big variations in the times to process the pulses in the pipeline. It implies that asymptotical synchronization typically also cannot be achieved. In the second simulation, we exhibit a phenomenon of clustering synchronization

Seed-Transmitted Wheat Mosaic Virus in Sweet Corn in Utah

Wheat mosaic virus (WMoV) (syn. High Plains virus) was first observed in corn in 1993 in Colorado, Idaho, Kansas, and Texas (Seifers et al. 1997). The virus causes chlorotic streaks and mosaic on corn foliage, and it stunts ear development. When infected early in the season, plants frequently die. There are anecdotal reports of reduced seed germination rates in infected seed lots. The host range of the virus includes corn, small grains, and yellow and green foxtail. The virus is transmitted by the wheat curl mite (Aceria tosichella Keifer 1969). Seed transmission of WMoV at extremely low rates was demonstrated in sweet corn in greenhouse grow-out tests by Forster et al. (2001), but due to the low transmission rate of three seedlings out of \u3e38,000 tested, this mode of transmission was considered to be negligible

Downy Mildew of Alfalfa

This fact sheet describes downy mildew, an obligate parasite. It describes symptoms in alfalfa, the disease cycle and how to manage it

Importance of seed as an inoculum source for High Plains Virus in sweet corn

High Plains Virus (HPV) is found in small grains and corn and is commonly transmitted by the wheat curl mite. In 2016, a local farmer had a high incidence of HPV in all of his sweet corn in three different locations. However no mites were found. Drone imagery was taken of the field and showed a pattern of infected corn plants that indicated that the virus was seed borne. Yield loss was an estimated 50% for the field. Seed transmission of HPV in corn has been considered unimportant in the past due to low percentage of infection (Forster et al. 2001). The objective of this project was to determine the level of seed contamination with HPV and rate of seed transmission to corn plants

Big Bud Disease in Tomatoes and Peppers

This fact sheet provides information on the symptoms of big bud on tomatoes and peppers. It reviews the disease cycle and recommendations on controlling beet leafhopper and managing big bud disease in Utah