共查询到20条相似文献,搜索用时 15 毫秒
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Zhu Fengwu Zhang Yuan 《中国科学基金(英文版)》2002,(1)
We have studied the partitioning of B in Fe -14B and of Zr, B, Si, Cu and Au in FeZrB nanocrys-talline soft magnetic alloys by using atom probe field ion microscopy (APFIM) and high resolution electron microscopy (HREM) in atomic or nano-metric scales and'the effect of Si, Cu, andAuaddition on the magnetic properties. For Fe- 14B after annealing, a -Fe particles with diameters of about 50-100 nm formed and they contain high supersaturated B. For Fe - 7Zr-3B -1 Cu amorphous alloy, it was found that Cu atoms formed clusters prior to the crystallization reaction. During the crystallization, Cu-enriched clusters provided nucle-ation sites for a -Fe phase so that the nucleation density of a -Fe phase increased. For Fe - 7Zr -5B- 1Au amorphous alloys, Au clusters were observed during the nucleation and growth stage of primary a -Fe and a -Fe did not form at the sites of Au cluster. Hence Au does not enhance the nucleation density of a -Fe particles. For Fe-7Zr-4Si-2B alloys it was found that Si atoms are reje 相似文献
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近时期来,地质学界出现了一个振奋人心的口号——向地球深部进军!它紧紧地吸引着地质科学工作者的注意力。许多人在思考着、在讨论着这个问题。它已经被视为是地质科学发展中一个重大的事件。 相似文献
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《中国科学基金(英文版)》2013,(2):19-19
Pancreatic cancer,the eighth most common cause of cancer-related death worldwide,has an extremely poor prognosis,while the median survival for metastatic disease is about 6months.For most pancreatic cancer patients,they are usually diagnosed at late stages with metastasis and have limited options for treatment. 相似文献
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《中国科学基金(英文版)》2015,(3)
<正>With the support by the National Natural Science Foundation of China and the Ministry of Science and Technology of China,Prof.Yao Dezhong's group at the Key Laboratory For NeuroInformation of Ministry of Education,School of Life Science and Technology,University of Electronic Science and Technology of China,reported enhanced functional connectivity(FC)and increased gray matter volume(GMV)of insula 相似文献
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数学界的好事者为了庆祝圆周率日(Pi Day),便将这个日子定在每年的3月14日,因为3.14刚好同这个著名比值的头几位数字相吻合。你也许知道,π就是圆的周长除以它的直径,但下面一些有关这个数学常数的事实就不太为人们所熟悉。我们曾考虑告诉你3.14个事实,但很可惜,我 相似文献
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《中国科学基金(英文版)》2020,(1)
正With the support by the National Natural Science Foundation of China,Ministry of Science and Technology of China,Chinese Academy of Sciences,and Collaborative Innovation Center of Quantum Matter,the teams led by Prof.Jiang Ying (江颖)at the International Center For Quantum Materials,Peking university,successfully grew a 2Dbilayer hexagonal ice(named"2Dice I")and imaged the 2Dice growth at the edges with atomic resolution.This work was published in Nature on January 2,2020. 相似文献
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2006年是国际荒漠年,今年6月5日纪念世界环境日的主题是“沙漠和沙漠化”。今年世界环境日还推出一句口号:“不让旱地变沙漠”。主题和口号都是让人们注意到养护世界上辽阔的旱地和半干旱地区防止沙漠化的重要性。今年的沙尘暴似乎也格外多,春天在北京城洒了30多万吨的沙土,使得京城“满城尽带黄金甲”;直到前些日子,5月25日兰州还有扬尘天气,让整个城市淹没在一片迷蒙的沙雾之中。沙尘暴这个话题,已经谈论了很多年了,比较严重的说法是,沙漠已经包围了我们,而沙尘暴只是沙漠向人类居住地进攻的一个前兆。为呼应这一主题,展示中国政府和人民… 相似文献
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《中国科学基金(英文版)》2017,(1)
正Subject Code:C03For the first time,scientists have measured the movements of high-flying insects in the skies over southern England and found that about 3.5trillion migrate over the region every year.Dr.Hu Gao(胡高)from Nanjing Agricultural University and Dr Jason Chapman from the University of Exeter led an analysis of 10-years radar data.The result of this analysis was published in Science(2016,354:1584—1587). 相似文献
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《中国科学基金(英文版)》2015,(1):45
<正>The transition metal compound tris(2,2'-bipyridyl)ruthenium(Ⅱ)(Ru(bpy)_3~(2+))is one of the most commonly used ECL probes,and its bioanalytical applications have been investigated during the past two decades.For immunoassay,ECL of Ru(bpy)_3~(2+)has been demonstrated to be more sensitive than the classical enzyme-linked immunosorbent assays(ELISAs).Despite the significant advance,in our opinion,the 相似文献
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《中国科学基金(英文版)》2018,(2)
正Light-matter interaction realized by plasmonic microstructures brings about a strong light confinement,which means energy can be controlled under micro-or nano-scale,providing a versatile approach to tailor optical properties precisely.However,a large Ohmic loss is inevitable in the plasmonic formations,and usually leads to the thermal instability and low efficiency of designed devices.For common plasmonic 相似文献
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一个擦屑而过匆匆消逝的经历夹带着无法言喻的气息,往往在你短暂模糊的记忆里留下深深浅浅的印记,甚至影响你心情的起伏,但你却说不清那究竟是什么。最近科学研究终于揭开了这个谜,原来那看不见摸不着的东西就是人类与生俱来的外激素——费洛蒙(pheromone)。 相似文献