By J. G. Heck

Drawn from a enormous six-volume compilation of illustrations and knowledge masking a huge variety of topics, this pretty quantity specializes in pictures of nature and technological know-how from the nineteenth century. contains meticulously reproduced metal engravings of famous person maps, animals, crops, minerals, fossils, geological formations, human anatomy, and masses extra.

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Extra resources for Heck's Pictorial Archive of Nature and Science

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5. The limits given represent the largest excess found in six multi-day time windows applied to data taken between December 15, 2000, and September 8, 2003. , 2004). b Oct. , 2003). , 1995). , 2000). f Sept. , 1999). , 2003). SEARCH FOR TeV EMISSION FROM X-RAY SELECTED AGN 47 locations and relative emitted power determined by the 5 GHz radio flux.

In the same manner, at current sensitivities, a TeV detection makes a GeV detection more likely. , in preparation). 3. Discussion Candidate counterparts to eight EGRET sources have been studied. It is noteworthy that steep single-dish spectra, indicative of extended radio structure, do not rule out the possibility of a compact core. Ter¨asranta et al. (2001) have also noted that extended sources should not be excluded as potential counterparts to EGRET sources. ). EGRET has opened a new window on the universe, allowing a significant number of sources to be identified, and providing indications as to which populations of sources include gamma-ray emitters.

1992, Astron. Ap. 262, 26. L. : 1992, Nature 359, 615. L. : 1993, Astrophys. J. Lett. 415, L13. D. : 1993, Nature 365, 133. V. A. V. V. ru 2 Max-Planck-Institut f¨ur Kernphysik, Saupfercheckweg 1, Heidelberg, Germany (Received 22 June 2004; accepted 14 July 2004) Abstract. We discuss the properties of gamma-ray radiation accompanying the acceleration of cosmic rays via the converter mechanism. The mechanism exploits multiple photon-induced conversions of high-energy particles from charged into neutral state (namely, protons to neutrons and electrons to photons) and back.

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