Ulf von Euler

Ulf Svante von Euler: 7 February 1905-10 March 1983.

Ulf Dieckmann , Johan A .

Millions of species currently exist on earth, and to secure an understanding of how all this magnificent variety arose is no small task. Biologists have long accepted Darwinian selection as the central explanation of adaptation and evolutionary change; yet, to date, no similar agreement has emerged about evolutionary processes that can create two species out of one. Almost 150 years after Darwi...

Tuve Löfström & Ulf Johansson

When performing data mining, the selection of data mining technique is a critical decision. Often this choice boils down to whether a transparent model is needed or not. Most research indicates that techniques producing transparent models, such as decision trees, often have an inferior accuracy compared to techniques such as neural networks. On the other hand, models created by neural networks ...

ULF Geomagnetic Changes Associated with Large Earthquakes

329 1 Marine Biosystems Research Center, Chiba University, Inage, Chiba, Japan *Corresponding author address: Prof. Katsumi Hattori, Marine Biosystems Research Center, Chiba University, Inage, Chiba, Japan; E-mail: [email protected] Despite its extreme importance and years of effort, practical short-term earthquake prediction still remains to be seen. However, research in earthquake...

Notes on Conformal Invisibility Devices Ulf Leonhardt

As a consequence of the wave nature of light, invisibility devices based on isotropic media cannot be perfect. The principal distortions of invisibility are due to reflections and time delays. Reflections can be made exponentially small for devices that are large in comparison with the wavelength of light. Time delays are unavoidable and will result in wave-front dislocations. This paper consid...