Humboldt University of Berlin

About: Humboldt University of Berlin is a education organization based out in Berlin, Germany. It is known for research contribution in the topics: Population & Transplantation. The organization has 33671 authors who have published 61781 publications receiving 1908102 citations. The organization is also known as: Humboldt-Universität zu Berlin & Universitas Humboldtiana Berolinensis.

The dehydro-Diels-Alder reaction.

Abstract: 2.1.3. Linker Bearing an Aromatic Ring 2053 2.2. Enynes and Diynes as Diene Component 2054 3. Photochemically Initiated DDA Reactions 2056 4. Mechanism of the DDA Reaction 2058 4.1. Mechanism of the Thermal DDA Reaction 2058 4.2. Mechanism of the PDDA reaction 2058 5. DDA Reactions Catalyzed by Bases 2058 6. Transition Metal-Catalyzed DDA reactions 2059 6.1. Rhodium and Platinum 2059 6.2. Palladium 2059 6.3. Gold 2061 7. Conclusions 2061 8. References 2062

VHE γ-Ray Observation of the Crab Nebula and its Pulsar with the MAGIC Telescope

Abstract: We report about very high energy (VHE) gamma-ray observations of the Crab Nebula with the MAGIC telescope. The gamma-ray flux from the nebula was measured between 60 GeV and 9 TeV. The energy spectrum can be described by a curved power law dF/dE = f(0)(E/300 GeV)([a+b log)((E/300 GeV)])(10) with a flux normalization f(0) of (6.0 +/- 0.2(stat)) x 10(-10) cm(-2) s(-1) TeV-1, a = 2.31 +/- 0.06(stat), and b = 0.26 +/- 0.07(stat). The peak in the spectral energy distribution is estimated at 77 +/- 35 GeV. Within the observation time and the experimental resolution of the telescope, the gamma-ray emission is steady and pointlike. The emission's center of gravity coincides with the position of the pulsar. Pulsed gamma-ray emission from the pulsar could not be detected. We constrain the cutoff energy of the pulsed spectrum to be less than 27 GeV, assuming that the differential energy spectrum has an exponential cutoff. For a superexponential shape, the cutoff energy can be as high as 60 GeV.