Raman Spectroscopy of Irradiation Effect in Three Carbon Allotropes Induced by Low Energy B Ions

Irradiation efect in three carbon allotropes C60, diamond and highly oriented pyrolytic graphite (HOPG) induced by 170 keV B ions, mainly including the process of the damage creation, is investigated by means of Raman spectroscopy technique. The diferences on irradiation sensitivity and structural stability for C60, HOPG and diamond are compared. The analysis results indicate that C60 is the most sensitive for B ions irradiation,diamond is the second one and the structure of HOPG is the most stable under B ion irradiation. The damage cross sections ? of C60, diamond and HOPG deduced from the Raman spectra are 7.78×10−15 , 6.38×10−15 and1.31 × 10−15cm2, respectively.

一氧化氮参与调节UV-B���导的豌豆幼苗生长抑制(英文)

对豌豆幼苗5天生长期内紫外线-B(UV-B)辐射对豌豆茎伸长生长和一氧化氮(NO)释放率的影响进行了研究.实验结果表明,UV-B���射促进了豌豆茎中的NO释放,同时抑制豌豆茎伸长生长;外源NO供体根际处理豌豆幼苗,与UV-B���射的上述效应相似;而用NO清除剂(PTIO)处理豌豆幼苗会产生和UV-B���射相反的效应,即增加了茎的伸长.由此可推测,NO也许作为信号参与调节UV-B���射诱导的生长抑制.

~(17)B���晕结构特征

实验利用束流衰减法测量了43.7AMeV丰中子核17B���C靶反应的总截面σR=(1724±93)mb.用零程Glauber计算,假定17B���有核芯15B���两个价中子结构,输入GG和GO密度分布,计算的激发函数曲线与该实验数据很好符合,输入描述稳定核双参数Fermi密度分布,不能得到与实验数据符合的结果,表明17B���核芯15B+2n的假定是合理的.并且中子密度分布表现较大空间扩展-晕结构特征.

丰中子奇异核~(17)B���实验研究

在兰州重离子加速器国家实验室(HIRFL)放射性次级束流线(RIBLL)上,用束流透射法测量了丰中子奇异核17B���C靶反应的总截面.假定17B���有15B(核芯)+2n结构,采用Gauss+HO形式的密度分布和零力程Glauber模型进行计算的结果可以很好地拟合实验数据,并得出17B���密度分布有一个很大的弥散,表明17B���双中子晕核.

Influence of low doses microwave radiation on activities of antioxidative enzymes of Isatis indigotica seedlings exposed to enhanced UV-B radiation

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ENVIRONMENTAL EVOLUTION OF ORDOS DESERT IN CHINA SINCE 1.1MA B. P. AS INDICATED BY YULIN STRATIGRAPHICAL SECTION AND ITS GRAIN-SIZE ANALYSIS RESULTS

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激光对uv-B���射大青叶和板蓝根品质的影响

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低剂量微波辐射对增强uv-B���射损伤菘蓝幼苗抗氧化酶活性的影响

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