Performance of Agronomic Crop Varieties in Alaska 1978 –2002

There is no such thing as the perfect variety for Alaska. Some varieties are adapted to a wide range of climatic and geographic locations, while others are more specific in their adaptation. The change in elevation of a few hundred feet or a move of a few miles can have a considerable effect on the performance of any variety. Also, cultural practices such as tillage, fertilizer rates, planting date, seeding rate, pest control, and a multitude of other factors can also influence crop yields. This is especially noticeable in northern environments such as Alaska. For example, date-of-planting studies done by F.J. Wooding (1973) and C.W. Knight (1989) found that any date after the middle of May for planting an agronomic crop can result in delayed maturity, low yields, and low quality grain, even for the best adapted varieties for Alaska

Circular 62

This is the eighth publication of grain performance trials in the Tanana River Valley. The first, published 7 years ago, included the results of spring cereal-variety tests conducted at Fairbanks and Delta Junction during the 1978 and 1979 growing seasons. Beginning in 1980, the variety-test results were annual publications. This report, like last year’s, is a shorter version than the first 6 publications of the series. It reflects continued budget constraints caused by Alaska’s sagging economy

Circular 57

This is the seventh publication of grain perform ance trials in the Tanana River Valley. The first, published 6 years ago, included the results of spring cereal-variety tests conducted at Fairbanks and Delta Junction during the 1978 and 1979 growing seasons. Beginning in 1980, the variety-test results were annual publications. The length and content of this report is much less than for previous years. This is the result of a cost-saving measure to help cope with a shrinking budget

On the numerical approximation of the rotation number

AbstractThe starting point of this paper is a polygonal approximation of an invariant curve of a map. Using this polygonal approximation an approximation for the circle map (the restriction of the map to the invariant curve) is obtained. The rotation number of the circle map is then approximated by the rotation number of the approximated circle map. The error in the obtained approximate rotation number is discussed, and related to the error in the polygonal approximation of the invariant curve. Simple algorithms for the approximation of the rotation number are described. A numerical example illustrates the theory

AAA architectures applied in multi-domain IMS (IP multimedia subsystem)

There is a group of communication services that use\ud resources from multiple domains in order to deliver their service.\ud Authorization of the end-user is important for such services,\ud because several domains are involved. There are no current\ud solutions for delivering authentication, authorization and\ud accounting (AAA) to multi-domain services. In our study we\ud present two architectures for the delivery of AAA to such\ud services. The architectures are analyzed on their qualitative\ud aspects. A result of this analysis is that direct interconnection of\ud AAA servers is an effective architectural solution. In current\ud multi-domain IP Multimedia Subsystem (IMS) architectures,\ud direct interconnection of AAA servers, such as the Home\ud Subscriber Servers (HSS), is not yet possible. In this paper we\ud argue and recommend to extend the IMS specification by adding\ud a new interface to HSS in order to support the direct\ud interconnection of HSS/AAA servers located in different IMS\ud administrative domains

Gender differences in tournament choices: risk preferences, overconfidence or competitiveness?

A large number of recent experimental studies show that women are less likely to sort into competitive environments. While part of this effect may be explained by gender differences in risk attitudes and overconfidence, previous studies have attributed the majority of the gender gap to gender differences in a separate 'competitiveness' trait. We re-examine this result using a powerful novel experimental technique that allows us to separate competitiveness from alternative explanations by experimental design. In contrast to the literature, the results from our experiment imply that the whole gender gap is driven by risk attitudes and overconfidence. We show that our results are due to our experimental approach, which circumvents concerns raised against the regression-based method used by previous studies. Our results have important implications for policy and future research

Gender differences in tournament choices: risk preferences, overconfidence or competitiveness?

A large number of recent experimental studies show that women are less likely to sort into competitive environments. While part of this effect may be explained by gender differences in risk attitudes and overconfidence, previous studies have attributed the majority of the gender gap to gender differences in a separate 'competitiveness' trait. We re-examine this result using a powerful novel experimental technique that allows us to separate competitiveness from alternative explanations by experimental design. In contrast to the literature, the results from our experiment imply that the whole gender gap is driven by risk attitudes and overconfidence. We show that our results are due to our experimental approach, which circumvents concerns raised against the regression-based method used by previous studies. Our results have important implications for policy and future research