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Siegmund Brandt 《Die Naturwissenschaften》1977,64(7):356-365
Following an article on the charm model (Naturwissenschaften 64, 229 (1977)) and its predictions, the present paper reviews the current status of its experimental verification. Four out of six predicted mesons with charm have been detected by their nonleptonic decay. The semileptonic decay of charmed mesons has also been established proving the predicted weak nature of the decay. In addition, there are strong indications as to the existence of charmed baryons from a photoproduction experiment corroborating clues given earlier by neutrino experiments. 相似文献
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W. Paul 《Die Naturwissenschaften》1959,46(9):277-283
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H. P. Dürr 《Die Naturwissenschaften》1973,60(6):274-280
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有着千年文化底蕴的杨柳青镇,位于天津市西青区,是区委、区政府所在地,其辖区面积64平方公里,有25个行政村,全镇11万人口,是天津市重点建设的八大外围组团之一,更是天津与环渤海经济圈内最大的乡镇。近些年随着经济的迅猛发展,新区的现代化建设充满了活力,使杨柳青在悠悠古镇的基础上,又增添了现代的气息。2003年,杨柳青当选为“津门新十景”。同年,又被国家环保总局命名为全国首批14个环境优美乡镇之一。 相似文献
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