共查询到20条相似文献，搜索用时 56 毫秒
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《昭通师范高等专科学校学报》2016,(5):35-37
简要综述了高能重离子碰撞中的光生过程,并简要讨论了喷注的光生机制.在高能重离子碰撞中,当转移动量很小时,该过程就是准实光子与核子(或部分子)的相互作用过程,即高能重离子碰撞中所谓的光生过程. 相似文献
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美国布鲁克海文国家实验室相对论重离子对撞机国际合作组的科学家,首次观察到了新型反物质反氦-4,这是迄今科学家观察到的最重反物质。高能对撞能形成夸克胶子等离子体,这种炽热、稠密的物质包含数量大致相当的夸克和反夸克粒子。夸克胶 相似文献
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径向集体流是高能重离子碰撞物理学研究中十分重要的实验可观测量,它能够把碰撞过程中压缩和膨胀阶段的部分信息带到碰撞的末态,通过对径向流的分析可还原碰撞过程中的信息。 相似文献
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根据核Drell-Yan过程的高能强子h同原子核A碰撞和高能轻子l同原子核A深度非弹性碰撞的实验数据,再考虑核子束缚能效应,计算并确定了价夸克分布函数RVA(xt)和海夸克分布核效应函数RSA(xt),深化了对原子核内夸克分布受核效应影响的认识. 相似文献
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桑木 《中国科教创新导刊》2005,(5):10
今年4月18日,从正在佛罗里达州坦帕市举行的美国物理学会会议上传来一个惊人的消息,美国能源部下属的布鲁克海文国家实验室的科学家宣布,他们利用相对论重离子对撞机(RHIC)制造出了"夸克-胶子等离子体"。这是一种全新的物质形态,曾广泛存在于宇宙诞生后的百万分之几秒中。这些科学家提出,对粒子碰撞的最新研究结果表明,在宇宙诞生的最初百万分之一秒,宇宙可能是液态状的,而不是像过去所认为的那样是炽热的气态状。 相似文献
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《中学物理教学参考》2004,33(5):6-6
美国科学家表示,他们研制成费米子凝聚态的物质,它属于“第六态”物质.这种新物质可能导致产生下一代超导体,并用于发电和制造磁悬浮列车等.人们过去已知的物质五种形态分别是气态、固态、液态、等离子态和玻色 爱因斯坦凝聚态.研究工作的带头人是美国标准技术研究院与科罗拉多大学合作实验室工作的物理学家金秀兰.金秀兰介绍说,这种第六态物质与玻色 爱因斯坦凝聚态物质有关.玻色 爱因斯坦凝聚态物质由成千上万个具有单一量子态的超冷粒子的集合,其行为像一个大超级原子.玻色 爱因斯坦凝聚态物质由玻色子构成.金秀兰研究小组所制成的新形态… 相似文献
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【信息链接】凤凰科技8月15日消息,在过去几年内,两个世界上最强大的粒子加速器(瑞士大型强子对撞机,纽约相对论重离子对撞机)以超快速度撞击质子、中子等粒子,撞击时产生强大能量将质子和中子粉碎,产生更基本的粒子——夸克和胶子,撞击产生的"夸克-胶子等离子体",温度在4万亿和6万亿摄氏度之间,温度约 相似文献
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利用双态原子轨道展开方法计算了质子、α粒子与类氢离子碰撞过程中的电子俘获截面,理论结果在中高能区与其他理论结果取得了较好的一致。 相似文献
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《海外英语》2007,(5):10-11
Many college freshmen arrive woefully unprepared to do college work, and as disadvantaged populations continue to grow, the share of the American work force that has made it through college is expected to plummet. Many experts blame that educational failure not just on high schools but also on colleges. School & College, a special report by The Chronicle, looks at efforts to fix the system. What reforms would better prepare students for college? What should schools and colleges be doing differently? How should state and federal officials help? 相似文献
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罗艳萍 《读与写:教育教学刊》2008,5(6)
The communication of people partially is the communication of cultures. Culture has a direct effect on international commercial activities in all aspects. Different conceptions about time, space, equality, law and the like, lead people to deal with things in different ways. So to know cultures of the counterpart is to facil-itate our enterprises so as to have a smooth and successful communication in commercial activity. 相似文献
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《海外英语》2007,(4):36
There are numbers of crossroads on our long and unpredictable life journey where we totally have no idea about which direction to choose. No matter what our decision is, we should not turn back, but face the music and go ahead instead. I am this kind of girl who always does try without regretting, one example is how I dealt with my love. 相似文献
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Migration occurs behind a variety of reasons and has a great effect on the whole world. People may migrate in order to improve their economic situation, or in order to escape civil strife, persecution, and environmental disasters. The impact of migration is complex, bringing both benefits anddisadvantages. This paper briefly talks about the causes of migration, the allocation of benefits, and the ways in which individual countries and the international community deal with this important subject. 相似文献
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Sister Carrie is one of the most controversial characters in American literature.Thought as a "fallen woman" firstly,she was defined as a "new woman" by some critics later. However, by digging into the motivaton behind the whole process of Carrie's "success", the relationship between Carrie and her creator (the author), the social conditions of then American, it can be found that Carrie has never been free-standing on her thought and she has never found her real-sdf even after becoming a famous actress. In a society dominated by mass consumerism Carrie is only an adherent of her own desires. She also is a representative of all those country girls flooded into cities, a symbol and a sacrifice of the urbanization of America in a time countryside was overcome by cities. 相似文献
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RUZBEHANI Mohsen 《重庆大学学报(英文版)》2004,3(1):20-25
1.IntroductionOne-cyclecontrolmethod,whichwasproposedaboutonedecadeago[1],hasbecomeanattractivemethodinspecialfieldssuchaspowerfactorcorrection[2-6],switchingamplifiers[7,8],etc.Themainideaofthiscontrollerisbasedonintegrationofdiodevoltageinone-cycleandforcesittobeexactlyequaltothereferencevalue.Themainadvantageofthiscontrollerisitsrealtimeabilitytorejectthevariationofinputvoltage[1].Despitethisgreatability,ithasnogoodperformancesinrejectingofloaddisturbanceandfollowingreferencecommands.Espec… 相似文献
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Richard Denner 《海外英语》2007,(4):14-15
Rosco and I wait for the fishermen to return.I sit at a wooden bench near the store at Mt.Baker Resort and watch the clouds change shape. Rosco has my belt around his neck and an eight foot tow chain hooked to a tree. Dogs must be on a leash. Ducks and rabbits are loose. 相似文献