第八百六十五章 :载人登火的前期准备工作
顶点小说(biquge432.com)更新快,无弹窗!
二十亿,买一份相对短期的实验室制备方法授权,即便是购买对象是室温超导材料,这个价格也的确有点夸张了。
不过徐川和樊鹏越都很清楚,这二十亿,既是上面对川海材料研究所的补贴,也是对后续室温超导材料优化以及工业化的经费投入。
室温超导材料对于前沿科技、国防武器的发展对于一个国家来说太重要了。
重要到二十亿连九牛一毛都算不上。
只要能解决掉室温超导材料的工业化难题,华国的科技发展能再上升至少一个台阶。
这种收益,别说二十亿了,就是两百亿、两千亿都值得。
所以徐川和樊鹏越也都没有提将这笔钱退一部分回去什么的,既然给了,那就收下就行。
而他们要做的,就是尽力加快速度,投入资金去解决温超导材料的优化以及工业化生产难题。
将川海材料研究所这边的工作安排妥当后,徐川便回到了南大。
室温超导材料这几天依旧牢牢的占据着各大平台讨论的热点,不过这事已经和他没有太多的关系了。
科学技术蔀那边的袁周礼接手了相关的工作,对全世界顶尖的一些材料研究所到华国这边来做超导检测实验。
虽然说对这种短暂的保密,不让室温超导材料短时间内流出去的做法有些不解,但徐川也没多想,让川海材料研究所那边配合了上面的工作。
大概是上面有一些自己的其他想法吧,对他来说,这些都是小事。
办公室中,正当徐川思考着航天领域的安排工作时,一道清脆悦耳的声音在耳边响起。
“教授,您现在有空吗?”
徐川扭头看去,是他最小的学生刘嘉楹,这会正站在门口看着他。
笑了笑,他开口问道:“怎么了?”
快步走了过来,刘嘉楹将手中的笔记本递了过来,开口问道:“我有个问题有些不懂,您能给我讲讲吗?”
“我看看。”
徐川笑着点了点头,接过了笔记本。
“子流形和余维数方面的啊。”
目光落在了清秀的字迹上,徐川扫视了一遍用圆珠笔记录下来的问题,笑着开口道。
“这个问题涉及到微分几何、微分拓扑与代数拓扑、微分方程和非线性分析等多个理论,你从哪里找来的?”
刘嘉楹想了下,回答道:“学习拉格朗日流形的时候,对光滑函数进行推论的时候遇到的。”
闻言,徐川有些讶异的看了她一眼,好奇的问道:“也就是说这个问题不是你从其他地方找到的,而是你自己在学习的过程中推导出来的?”
刘嘉楹点了点头,道:“我好像的确没在相关的教材上见到过这个问题。”
顿了顿,她的目光落在徐川手上捏着的笔记本上,接着道:“学习紧辛流形的时候,任何一个m上的光滑函数,其临界点的个数不小于m的畴数,而后者不小于m的上同调群的cup积长。”
“这些量都是m的拓扑不变量,但非退化hamilton微分同胚的不动点个数好像不在这上面的样子。”
徐川笑着开口道:“非退化hamilton微分同胚当然不在临界点上面了,因为这不是本科生的内容。”
站起身,他走到墙角将移动黑板拖出来,从笔篓中拾起了记号笔,在黑板上面写道:
“一个2n维流形m称为辛流形,如果其上具有一个处处非退化闭的2形式w。它的n维子流形l称为拉格朗日子流形。”
“如果w|l=0,则可以设:h:r/zxm→r是一个光滑函数,它定义了一个向量场xh满足w=dh。”
“.微分同胚有退化和非退化两种情况,hamilton微分同胚的不动点个数取决于.”
脑海中有关于这个问题的基础和思路如涓涓流水般书写在黑板上,当最后一笔落下的时候,徐川笑着转过身,看着目光紧盯着黑板的刘嘉楹笑着问道。
“听懂了多少?”
“大概一半?”
刘嘉楹想了想说道,很快又改变了自己的想法,弱弱的说道:“三分之一?”
“也有可能是五分之一”
徐川笑着道:“没事,这个问题已经超出了你现阶段的学习了。这是博士研究生才会涉及到的东西,你现在才是本科生,已经很不错了。”
顿了顿,他接着道:“要想解决这个问题,你需要先知道如何用m的畴数还有m的上同调类的cup积长即做的不动点的个数的下界。”
一边说,他一边擦掉部分公式,重新在黑板上写道:《伯克霍夫-刘易斯不动点定理和阿诺德的一个猜想》,《辛作用的非正则化梯度流》,d.胡斯莫勒编写的《对称双线性形式》,唐纳森教授编写的《规范理论在四维拓扑结构中的应用》这些论文和教材,你可以去找找看看。”
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