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‘科学工作’ 分类的存档

New Category: Mathematica and Chaos

2006年1月19日 3 条评论
In this new Category, named "Mathematica", I have a very simple idea about collecting some sorts of Chaos (also Fractal...), and using Mathematica to see what happens in these nonlinear systems. When I first touched with the word Chaos (the translation of this word in Chinese pronounces like HunDun), I was attracted by the vivid graphical expression of all these pure mathematical behaviour. And that is really fun for me, so the aim of this new category is to show how beautiful Science will be.
 
All articles in this category will be writen in English, because usually discussing "Science" in English is more convenience.
 
 
 
分类: 科学工作 标签:

研究过程中恼人的事情

2006年1月16日 1 条评论
今天上午,到ITER Blanket项目“总指挥”办公室讨论了些问题,无非上个项目的报告(D2,去年年底)。到头来,却另外加了些不相关的问题进来,9月以前又要交一份报告,作些别的分析。其原因在于,原来大项目组里有一个人申请了一个10万欧元的项目(D3),却没有完成任何的工作,到Deadline过了一年,发现我们小组(现在做实际工作的,就我一个)可以做些类似的分析,就要求让我们来完成这个任务。当然是所有的工作,毕竟他一点都没有开始,最后的报告里还要有他的名字。方舟子在美国拼命打国内的学术腐败,其实今天就见了一个德国的。感觉现在自己的位置完全是“受害方”,要完成10万欧元项目的所有工作,却没有任何回报。一个只有3/4位置的博士生,却要在一年时间内完成3个项目,资金20万欧元,最后没有一个Cent到自己口袋。最恼人的是,自己原来的研究计划(非常感兴趣的问题),不得因此推迟。
 
后来还知道,我们现在的经费还养了研究所不少人,当然大多数不做具体的工作,而且都是德国人。所里不少的德国同事,每天聊天消耗的工作时间都不少。现在也可以理解不少想回国做研究的,毕竟在国内自己做“老板”,也不会有这些郁闷的事情发生。
 
幸好最后与“老板”和“总指挥”讨价还价,把工作量减到最少,不过仍然有不少的事情要做。下次再有类似的事情,决定还是要更进一步:要么不做;要么涨工资。
...阿Q呀...
 
昨天QQ上见到以前国内的师兄,当面就问了一句“文章发了几篇”,当时就无言以对。毕竟师兄马上博士毕业,文章还是很看重的,不过无奈到德国半年多,工程问题处理了不少,却一直没到要做“SCI专栏作家”的地步。上周见教授,教授提醒可以注意一些会议和投些文章,我回答说,还要改进一下模型。毕竟至少要有自己满意的结果才行。
分类: 科学工作 标签:

转一篇“绿色和平”组织对于ITER项目的反对申明

2006年1月4日 没有评论

Nuclear fusion reactor project in France: an expensive and senseless nuclear stupidity

28 June 2005

Paris, France — Greenpeace deplores the agreement by the Representatives of the Parties to the International Thermonuclear Experimental Reactor (ITER) (1) to construct one of the world's largest nuclear fusion experiments in Cadarache, Southern France. The project, estimated to cost 10bn euros, will not generate any electricity, instead it will need massive amounts of energy to heat up.

"With 10 billion, we could build 10,000MW offshore windfarms, delivering electricity for 7.5 million European households," said Jan Vande Putte of Greenpeace International. Advocates of fusion research predict that the first commercial fusion electricity might be delivered in 50 to 80 years from now. But most likely, it will lead to a dead end, as the technical barriers to be overcome are enormous.

Today, the nuclear industry presents itself as the solution to climate change in a massive green-washing drive. Far from being a solution, the nuclear option stalls real action to combat dangerous climate change. It is taking away the money for real solutions that are ready and economically available at a large scale, such as wind energy.

Fusion energy - if it would ever operate - would create a serious waste problem, would emit large amounts of radioactive material and could be used to produce materials for nuclear weapons. A whole new set of nuclear risks would thus be created.

"Governments should not waste our money on a dangerous toy which will never deliver any useful energy," said Jan Vande Putte of Greenpeace International. Instead, they should invest in renewable energy which is abundantly available, not in 2080 but today"

Notes to Editor

(1) The European Union, the United States, Rusia, Japan, South Korea and China are partners in this project.

From:  http://www.greenpeace.org/international/press/releases/ITERprojectFrance

分类: 科学工作 标签:

Publication

2006年1月4日 1 条评论


2008:
[1]
Gan and Kamlah (2008) Thermo-mechanical analysis of pebble beds in HELICA mock-up experiments. Fusion Engineering and Design 83(7-9): 1313-1316.
[2]


2007:

[1] Gan Y., Kamlah M., Rizzi G. and Boccaccini L.V. (2007) Validation
of a thermo-mechanical model for ceramic breeder and beryllium pebble beds. Final
report on the EFDA task TW2-TTBB-006b D03, FZK
Fusion
297.
[2]
Gan and Kamlah (2007) Identification of material parameters of a thermo-mechanical model for pebble beds in fusion blankets. Fusion Engineering and Design 82(2): 189-206.
[3]
Gan and Kamlah (2007) Thermo-mechanical analyses of HELICA and HEXCALIBER mock-up experiments. Final report on EFDA task TW5-TTBB-001-D11, FZK Fusion 312.


2006:
[1] Gan and Kamlah (2006) Thermo-mechanical modelling of ceramic breeder and Beryllium pebble beds. FZK Fusion 266. Report on EFDA TW2-TTBB-006bD02.
[2] Zhou, Kamlah, Gan and Laskewitz (2006) Time-dependent nonlinear ferroelastic behaviour of soft lead zirconate titanate piezoceramics. Advances in Science and Technology 45: 2464-2471.
[3] Zhou, D., FitzGerald, G., Gan, Y., Kamlah, M, and Laskewitz, B. (2006) Experimental
Investigation of Ferroelectric Domain Switching Processes in Soft Lead
Zirconate Titanate Piezoceramics. Electroceramics X, Toledo,
Spain. (Poster)
[4]
Gan and Kamlah (2006) Thermo-mechanical Modelling of Pebble Beds in Fusion Blankets and its Implementation by a Return-Mapping Algorithm. 2006 MRS Fall Meeting, Boston, MA, USA. in Structural and Refractory Materials for Fusion and Fission Technologies, edited by J. Aktaa, M. Samaras, M. Serrano de Caro, M. Victoria, B. Wirth (Mater. Res. Soc. Symp. Proc. 981E, Warrendale, PA, 2007)


2005:
[1] Gan, Chen and Shen (2005) Three-dimensional modeling of the mechanical property of linearly elastic open cell foams. International Journal of Solids and Structures. 42(26), 6628-6642.
[2] Gan (2005) Voronoi Modeling of the Constitutive Behaviors of Cellular Solids. Master Thesis of Xi'an Jiaotong Univerisity (in Chinese). 《多孔介质本构行为研究》西安交通大学硕士学位论文
[3] Gan, Chen and Shen (2005) The mechanical behavior of three dimensional Voronoi open cell foams. Conference on "Journal of Mechanical Strength", Zhengzhou, China (in Chinese).
[4] Gan, Chen and Shen (2005): 开孔泡沫材料弹塑性行为的三维数值模拟和宏观模型研究.
中国力学学会学术大会2005 (CCTAM2005),北京.
[5]
Gan, Chen and Shen
(2005):
三维Voronoi开孔泡沫材料的力学行为研究.
中国力学学会学术大会2005 (CCTAM2005),北京.


2002:

[1] Gan, Chen, Shen and Tian (2002) Micro-mechanics modelling of the micropolar constitutive behavior of two-dimensional cellular metals. National conference on solid mechanics, Dalian, China (in Chinese).
[2] 《二维泡沫金属微极本构关系的细观力学研究》西安交通大学学士学位论文



Projects:
EFDA TW5-TTBB-001-D11: Analysis for the HELICA and HEXCALIBER experiments using ABAQUS Drucker-Prager model. (50kEuro, finished in 2007)
EFDA TW2-TTBB-006b-D03: Thermo-mechanical modelling of pebble beds assembly -Validation of a thermo-mechanical program code for pebble bed assembly. (100kEuro, finished in 2007)
EFDA TW2-TTBB-006b-D02: Thermo-mechanical modelling of pebble beds assembly -Development of pebble bed models. (50kEuro, finished at 02/2006)


分类: 科学工作 标签:

科学家造公式,工程师搭积木

2005年12月1日 1 条评论
这是昨天开会时候蹦到头脑中的一个想法。
 
那个会中,有几个年轻的工程师,演示了关于Plasma腔中远程维护的CAD动画,展示了各种可能的方案。立刻让我想到了小时候搭积木,后来的智力游戏什么的。其实就是怎么把一个瓶子中的东西取出来,然后更换,当然具体的实现就需要太多的研究了。由最新的CAD技术虚拟现实,不过至少好看和有趣。
 
而作为科学家,总在一堆硬骨头中找一个相对不硬的,开始“啃”。问题是,一般相对不硬的骨头都被前面的人啃去了;甚至连骨头都不剩,那就找个别的,例如铁棒,无论如何也要啃。不过也经常可以看见对于啃骨头十分热爱的,讲起自己的问题兴高采烈。毕竟有不少是“天生”的科学家。
 
科学家造公式,工程师搭积木
 
其实,也就是工程和科学对于问题的性质和方式不一样了。前面的那个远程维护的问题到最后设计和实现,还是有不少的硬骨头的,问题是谁先找到相对不硬的。
分类: 科学工作 标签: