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The measurements of partial production cross sections of the multiple helium projectile fragments emitted at 4.5 A GeV/c {}^{16}O-Em interactions are reported. We have studied the production rate of helium projectile fragments due to fragmentation of {}^{16}O ions and compared it with that obtained from different projectiles at various energies. The dependence of on the mass number of the incident beams is formulated. The multiplicity distributions of the helium fragments produced in {}^{16}O-Em interactions at different energies exhibit Koba-Nielson-Olesen (KNO) scaling. The correlation of helium projectile fragments and target fragments is also investigated and it is found that the average of target fragments is increased with the decrease of the number of helium fragments in peripheral interactions. 相似文献
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对牡丹牌镁带(43 mm×3 mm)表面黑灰色薄膜进行了X射线衍射分析,结果表明牡丹牌镁带表面黑灰色薄膜组成是Mg(OH)2和Mg,并以此实验研究结果为基础,对镁带表面黑灰色薄膜形成、显色机理做了理论分析,模拟实验结果进一步验证了理论分析。 相似文献
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全国高等师范院校第十五届物理化学暨第十一届物理化学实验教学研讨会于2006年7月28日至8月1日在云南大理学院召开,来自全国47所院校的90位代表出席了会议,递交论文60篇。 相似文献
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The electromagnetic dissociation (ED) of 3.7 A GeV {}^{16}O in nuclear emulsion is investigated with high statistics. It is found that the electromagnetically dissociated cross section increases with increasing beam energy, the charge distribution of projectile fragments is the same as the results at 60 and 200 A GeV, and the production probability of projectile fragments with charge 3≤Z≤5 is less than that of the other projectile fragments. These results can be well explained by use of Weizsacker and Williams method for calculating the ED contributions. The percentile abundance of various decay modes for ED at 3.7 A GeV is close to the result at 60 and 200 A GeV, but it is different from the result at 14.6 A GeV. The ED of 3.7 A GeV is mainly caused by the giant dipole and quadrupole resonance of E1 and E2, which can be qualitatively explained by the multiplicity distribution of projectile proton in ED. The multiplicity distribution of the α fragments in ED and nuclear events have different functional forms. This difference may be a consequence of the different reaction mechanism involved. 相似文献
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一般认为“氯化铝是分子晶体,熔融的氯化铝不导电,在电解槽中不能电解”,但这不是绝对的,我们可以改变它的环境,比如电解NaCl—AlCl3熔盐制铝[1],这一类似问题在中学教辅材料中早有体现,如电解Al2O3—Na3AlF6制铝,其中Na3AlF6的引入便是问题的关键,近年来Al在NaCl—AlCl3熔盐体系中的电沉积研究已经取得了很多研究成果[2],以下对电解熔融氯化铝问题进行分析。1电解熔融氯化铝问题的理论分析纯的氯化铝是无色的晶体,在通常情况下氯化铝容易挥发,180℃时开始升华,研究其蒸气密度表明在400℃以下氯化铝的分子式为Al2Cl6,氯化铝溶于有机… 相似文献
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化学实验在2007年高考试题中的体现形式以及解答方式均出现了新的变化;纵观2007年高考化学试卷(含理科综合卷)发现,化学实验试题及分值占的比例较大,全国卷与各省自主命题的试卷各有特点,研究新课改背景下的化学实验教学和实验高考复习无疑是一个新的课题,认真分析高考试题的新特点无疑也是备考复习过程中的重要一环,本文拟结合2007年全国高考试题中化学实验试题来解读化学实验考查的特点及对化学实验备考复习的启示。1试题设计突破常规模式,注重基本实验设计能力的考查例题1(全国Ⅰ)28(15分)水蒸气通过灼热的焦炭后,流出气体的主要成分是C… 相似文献
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The topology of 16O fragmentation at 3.7 A GeV in reactions with emulsion nuclei is presented. The multiplicity distributions of projectile fragments,charged secondaries and their dependences on the projectile residues are discussed. 相似文献