超低温のふしぎな世界

一日遊学in文京　2005年5月28

Ecological Studies on Japanese Encephalitis Virus. Isolation of Japanese Encephalitis Virus from Mosquitoes Collected in Nagasaki and Kagoshima districts, Japan, in 1965.

Continual survey in Nagasaki prefecture were established at Kuromaru village since last year. In this season, 13 places in Nagasaki prefecture and the suburbs of Taniyama city, Kagoshima prefecture, were selected additionally for the collection of mosqui

生体インピダンス法で測定した体脂肪率およびBMIにより判定した肥満区分別の食物摂取状況

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Observation results by the TAMA300 detector on gravitational wave bursts from stellar-core collapses

We present data-analysis schemes and results of observations with the TAMA300 gravitational-wave detector, targeting burst signals from stellar-core collapse events. In analyses for burst gravitational waves, the detection and fake-reduction schemes are different from well-investigated ones for a chirp-wave analysis, because precise waveform templates are not available. We used an excess-power filter for the extraction of gravitational-wave candidates, and developed two methods for the reduction of fake events caused by non-stationary noises of the detector. These analysis schemes were applied to real data from the TAMA300 interferometric gravitational wave detector. As a result, fake events were reduced by a factor of about 1000 in the best cases. The resultant event candidates were interpreted from an astronomical viewpoint. We set an upper limit of 2.2x10^3 events/sec on the burst gravitational-wave event rate in our Galaxy with a confidence level of 90%. This work sets a milestone and prospects on the search for burst gravitational waves, by establishing an analysis scheme for the observation data from an interferometric gravitational wave detector