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Now showing items 21-40 of 1891
  • Aaltonen, Timo; Mehtälä, Petteri; Mäki, Tuula; Orava, Risto; Saarikko, Heimo; Österberg, Kenneth; CDF Collaboration (American Physical Society, 2010)
    We report the observation of electroweak single top quark production in 3.2  fb-1 of pp̅ collision data collected by the Collider Detector at Fermilab at √s=1.96  TeV. Candidate events in the W+jets topology with a leptonically decaying W boson are classified as signal-like by four parallel analyses based on likelihood functions, matrix elements, neural networks, and boosted decision trees. These results are combined using a super discriminant analysis based on genetically evolved neural networks in order to improve the sensitivity. This combined result is further combined with that of a search for a single top quark signal in an orthogonal sample of events with missing transverse energy plus jets and no charged lepton. We observe a signal consistent with the standard model prediction but inconsistent with the background-only model by 5.0 standard deviations, with a median expected sensitivity in excess of 5.9 standard deviations. We measure a production cross section of 2.3-0.5+0.6(stat+sys)  pb, extract the value of the Cabibbo-Kobayashi-Maskawa matrix element |Vtb|=0.91-0.11+0.11(stat+sys)±0.07  (theory), and set a lower limit |Vtb|>0.71 at the 95% C.L., assuming mt=175  GeV/c2.
  • Laaksoharju, Taina; Rappe, Erja (2010)
    There is considerable evidence that children in modern society are losing<br/>their contact with nature and, more precisely, with green plants. Is this also the case in Finland, a northern country famous for its forests and wild nature? This study examines the relationship of 9- to 10-year-old Finnish schoolchildren with the green environment and plants. The data were gathered by a questionnaire<br/>comprising structured and open-ended questions. The focus of the research was on two comparisons: first, on the nature and child relationship in rural and urban neighborhoods and, second, among boys and girls. Participants in the study amounted to a total of 76 children, 42 in the Helsinki suburb area and 34 in Paltamo. The results suggested that the children in rural surroundings had closer contact with nature than their urban associates. For example, the children of Paltamo reported to know the trees better, and considered human beings to be part of nature more often (100% vs. 76% of the pupils in Helsinki, P = 0,003). Similarly, the results showed that girls in the study (N = 48) were more interested in plants than boys (N = 28). For the girls, the beauty and joy of plants was important, whereas the boys appreciated plants as the source of life. After the pre-questioning, the children of Helsinki participated in an in-class horticultural intervention and 10 days later, answered a similar questionnaire again. The results of the open-ended questions revealed that equally to children in other Western countries, Finnish children may also be in danger of losing their direct contact with the natural environment. It was common to pass free time in organized sports such as hockey or football (boys), or by just walking and talking with friends (girls). Rural children told that they still built huts, pick berries, and climb trees, whereas urban children played in parks and city groves. The results suggest that it is essential to research<br/>further the children’s own experiences if we are to understand, and subsequently, to enhance, the crucial role of the green environment in their lives. Horticultural interventions can be effective starting points to add to children’s knowledge, affection, and interest toward greenery, but it is highly recommended that they take place outdoors rather than indoors.
  • Laaksoharju, Taina; Rappe, Erja (2010)
    There is considerable evidence that children in modern society are losing<br/>their contact with nature and, more precisely, with green plants. Is this also the case in Finland, a northern country famous for its forests and wild nature? This study examines the relationship of 9- to 10-year-old Finnish schoolchildren with the green environment and plants. The data were gathered by a questionnaire<br/>comprising structured and open-ended questions. The focus of the research was on two comparisons: first, on the nature and child relationship in rural and urban neighborhoods and, second, among boys and girls. Participants in the study amounted to a total of 76 children, 42 in the Helsinki suburb area and 34 in Paltamo. The results suggested that the children in rural surroundings had closer contact with nature than their urban associates. For example, the children of Paltamo reported to know the trees better, and considered human beings to be part of nature more often (100% vs. 76% of the pupils in Helsinki, P = 0,003). Similarly, the results showed that girls in the study (N = 48) were more interested in plants than boys (N = 28). For the girls, the beauty and joy of plants was important, whereas the boys appreciated plants as the source of life. After the pre-questioning, the children of Helsinki participated in an in-class horticultural intervention and 10 days later, answered a similar questionnaire again. The results of the open-ended questions revealed that equally to children in other Western countries, Finnish children may also be in danger of losing their direct contact with the natural environment. It was common to pass free time in organized sports such as hockey or football (boys), or by just walking and talking with friends (girls). Rural children told that they still built huts, pick berries, and climb trees, whereas urban children played in parks and city groves. The results suggest that it is essential to research<br/>further the children’s own experiences if we are to understand, and subsequently, to enhance, the crucial role of the green environment in their lives. Horticultural interventions can be effective starting points to add to children’s knowledge, affection, and interest toward greenery, but it is highly recommended that they take place outdoors rather than indoors.
  • Roos, Teemu; Schmidt, Daniel F. (2010)
  • Roos, Teemu; Schmidt, Daniel F. (2010)
  • Roos, Teemu (HELSINGIN YLIOPISTO., 2010)
    Kirjoittaja kuvaa omasta näkökulmastaan eroja Suomen ja Yhdysvaltain huippuyliopistojen välillä, vierailtuaan muutaman kuukauden sekä Kalifornian yliopistossa Berkeleyssä että MIT:ssa. Tulivuorenpurkausten ja muiden esteiden jälkeen hän pääsee tapaamaan Turing-palkinnolla palkittua professori Barbara Liskovia kysyäkseen tältä salaisuutta menestykseen.
  • Roos, Teemu (HELSINGIN YLIOPISTO., 2010)
    Kirjoittaja kuvaa omasta näkökulmastaan eroja Suomen ja Yhdysvaltain huippuyliopistojen välillä, vierailtuaan muutaman kuukauden sekä Kalifornian yliopistossa Berkeleyssä että MIT:ssa. Tulivuorenpurkausten ja muiden esteiden jälkeen hän pääsee tapaamaan Turing-palkinnolla palkittua professori Barbara Liskovia kysyäkseen tältä salaisuutta menestykseen.
  • Eskelin, Karolina (2010)
  • Klyukhin, V.P.; Amapane, Nicola; Andreev, V; Ball, Alan; Cure, B; Herve, A; Gaddi, A; Gerwig, H; Karimaki, V.; Loveless, R; Mulders, Martijn; Popescu, S; Sarycheva, L.I.; Virdee, Terinder (Institute of Electrical and Electronics Engineers, 2010)
  • Klyukhin, V.P.; Amapane, Nicola; Andreev, V; Ball, Alan; Cure, B; Herve, A; Gaddi, A; Gerwig, H; Karimaki, V.; Loveless, R; Mulders, Martijn; Popescu, S; Sarycheva, L.I.; Virdee, Terinder (Institute of Electrical and Electronics Engineers, 2010)
  • Bimbo, Luis M.; Sarparanta, Mirkka; Santos, Helder A.; Airaksinen, Anu J.; Makila, Ermei; Laaksonen, Timo; Peltonen, Leena; Lehto, Vesa-Pekka; Hirvonen, Jouni; Salonen, Jarno (AMERICAN CHEMICAL SOCIETY., 2010)
  • Tuomarla, Ulla (Gaudeamus,, 2010)
  • Chatrchyan, S.; Anttila, E.; Czellar, S.; Härkönen, J.; Heikkinen, A.; Karimäki, V.; Kinnunen, R.; Klem, J.; Kortelainen, M. J.; Lampén, T.; Lassila-Perini, K.; Lehti, S.; Lindén, T.; Luukka, P.; Mäenpää, T.; Nysten, J.; Tuominen, E.; Tuominiemi, J.; Ungaro, D.; Wendland, L.; CMS Collaboration (INSTITUTE OF PHYSICS PUBLISHING, 2010)
  • Chatrchyan, Serguei; Anttila, Erkki; Czellar, Sandor; Härkönen, J.; Heikkinen, A.; Karimäki, V.; Kinnunen, R.; Klem, J.; Kortelainen, M.J.; Lampén, T.; Lassila-Perini, K.; Lehti, S.; Lindén, T.; Luukka, Panja; Mäenpää, T.; Nysten, J.; Tuominen, E.; Tuominiemi, J.; Ungaro, D.; Wendland, L.; CMS Collaboration (INSTITUTE OF PHYSICS PUBLISHING, 2010)
  • Chatrchyan, Serguei; Anttila, Erkki; Czellar, Sandor; Härkönen, Jaakko; Heikkinen, Mika Aatos; Karimäki, Veikko; Kinnunen, Ritva; Klem, Jukka; Kortelainen, Matti; Lampen, Pekka Tapio; Lassila-Perini, Katri Marjaana; Lehti, Sami Tapio; Linden, Tomas; Luukka, Panja; Mäenpää, Teppo H; Nysten, Jukka Sakari; Tuominen, Eija; Tuominiemi, Jorma; Ungaro, Donatella; Wendland, Lauri Andreas; CMS Collaboration (INSTITUTE OF PHYSICS PUBLISHING, 2010)
  • Chatrchyan, Serguei; Anttila, Erkki; Czellar, Sandor; Härkönen, Jaakko; Heikkinen, Mika Aatos; Karimäki, Veikko; Kinnunen, Ritva; Klem, Jukka; Kortelainen, Matti; Lampen, Pekka Tapio; Lassila-Perini, Katri Marjaana; Lehti, Sami Tapio; Linden, Tomas; Luukka, Panja; Mäenpää, Teppo H; Nysten, Jukka Sakari; Tuominen, Eija; Tuominiemi, Jorma; Ungaro, Donatella; Wendland, Lauri Andreas; CMS Collaboration (INSTITUTE OF PHYSICS PUBLISHING, 2010)
  • Chatrchyan, S.; Anttila, E.; Czellar, S.; Härkönen, J.; Heikkinen, A.; Karimäki, V.; Kinnunen, R.; Klem, J.; Kortelainen, M.J.; Lampén, T.; Lassila-Perini, Katri Marjaana; Lehti, S.; Lindén, T.; Luukka, P.; Mäenpää, T.; Nysten, J.; Tuominen, E.; Tuominiemi, J.; Ungaro, D.; Wendland, L.; CMS Collaboration (INSTITUTE OF PHYSICS PUBLISHING, 2010)
  • Chatrchyan, Serguei; Anttila, Erkki; Czellar, Sandor; Härkönen, Jaakko; Heikkinen, Mika Aatos; Karimäki, Veikko; Kinnunen, Ritva; Klem, Jukka; Kortelainen, Matti; Lampen, Pekka Tapio; Lassila-Perini, Katri Marjaana; Lehti, Sami Tapio; Linden, Tomas; Luukka, Panja; Mäenpää, Teppo H; Nysten, Jukka Sakari; Tuominen, Eija; Tuominiemi, Jorma; Ungaro, Donatella; Wendland, Lauri Andreas; CMS Collaboration (INSTITUTE OF PHYSICS PUBLISHING, 2010)