j******h
发帖数: 3904 | 1 草，又是核爆，用点脑子想想好不好
用膝盖想都知道不可能 |
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s**********l
发帖数: 8966 | 2 全世界已经很久没有核爆了吧，上次还是印度跟巴基斯坦。 |
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n*******4
发帖数: 2285 | 6 原子弹只有发生核爆才会产生核污染。铀和钚放射性挺小的，手拿着都没问题。核污染
来自核裂变产物，因为它们是很不稳定的原子核。反应堆爆炸会产生核污染，因为燃料
棒里已经充满核裂变产物。 |
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g**w
发帖数: 969 | 7 那你说说这个纪录片里的3-5 megaton是不是夸大了？ |
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n*******4
发帖数: 2285 | 8 裂变材料原子弹当量跟本不会超过十万吨，因为有临界体积的物理限制，没法做的太大
。而且还需要浓缩铀或高纯的钚。所以融堆的核燃料不会发生核爆， 但是会发生高温
下的脏爆，把裂变产物炸的到处都是，危害要大于原子弹爆炸的放射性尘埃沾染，因为
裂变产物比几公斤级的原子弹质量大多了。
BTW，苏联空投过五千万吨级的氢弹，3-5 megaton不会炸掉半个欧洲。但切尔诺贝利的
放射性尘埃沾染可能大于五千万吨级的氢弹的沾染。 |
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b********7
发帖数: 2404 | 9 I agree. Water is split into H2 and O2. High T and P give rise to
hydrogen explosion to spread the radiative materials. It is so-called 脏爆
, NOT 核爆. But it is worse than 核爆! |
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n*****d
发帖数: 956 | 11 海豚同学，我还是很相信你的专业知识的。就现在公布的情况看，最坏的结果可能是什
么？ |
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y*h
发帖数: 25423 | 13 最坏就是引发新的宇宙大爆炸制造出一个黑洞把银河系都吸进去，
大家就不分彼此了。趁着还有几个小时的时间抓紧把要干的时都
干了吧，别灌水了。 |
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b********7
发帖数: 2404 | 14 Tokyo is gone. Japan is gone! (in range of 200 miles) |
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n*****d
发帖数: 956 | 16 ft。我跟你严肃地讨论。如果可能发生脏爆，堆芯融了之后不能再灌水了吧。 |
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g******t
发帖数: 18158 | 17 没有那么严重，最多是引爆大气中的氮气，和氧气生成氧化氮，导致地球上的生命消失
没有银河宇宙什么事 |
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y*h
发帖数: 25423 | 18 ft，我还不够严肃吗，还有比这更严肃的事情吗？！ |
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n*******4
发帖数: 2285 | 22 稳定的重核中子含量大，铀235含60%，稳定的中等质量原子核质子，中子比接近1:1.
裂变产物含60%中子就不稳定，要通过贝塔衰变中子变质子原子核才稳定。 |
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j******h
发帖数: 3904 | 23
yoh够专业！赞一个！！！
以后尿尿都不带冲水了，直接尿黑洞里头，多环保啊！！！ |
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y*h
发帖数: 25423 | 24
其实到时候你和尿是同一种东西，不需要往外尿了～ |
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j******h
发帖数: 3904 | 25
就不兴造一个光吸尿的黑洞？尿完开关一关，啪，黑洞和尿都没了 |
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g**w
发帖数: 969 | 26 这个黑洞有万分之一的危险把小JJ也吸进去，你用不用？ |
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j******h
发帖数: 3904 | 27
日本人设计的吧，先让设计师尿个十万次，可靠性不错后再尿，哈 |
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m*****e
发帖数: 10963 | 28 这个纪录片拍的还是不错的。
不过估计这个炸掉半个欧洲的说法是说法的问题，中间没说明白，应该是污染扩展至半
个欧洲，毁掉半个欧洲。。 |
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g**w
发帖数: 969 | 29 nod,非常不错。
看了后觉得日本完了，苏联动员了50万人做出巨大牺牲才算是把反映堆整个封了起来，
日本打算怎么搞？
不理也不行，一次脏爆，起码半个日本没了。 |
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x*****u
发帖数: 6559 | 30 The China Syndrome is a term coined by an American physicist in 1971 to
describe the hypothetical result of a severe nuclear meltdown in which
molten reactor core components penetrate their containment vessel and
building and melt through the crust of the Earth (possibly penetrating
deeply enough to reach a point on the other side of the world). The veracity
of this hypothesis remains strongly contested.
see why china there? there is also a movie. |
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w********s
发帖数: 343 | 31 There must be one!!!
WASHINGTON – The chief of the U.S. Nuclear Regulatory Commission said
Wednesday that all the water is gone from one of the spent fuel pools at
Japan's most troubled nuclear plant, but Japanese officials denied it.
If NRC Chairman Gregory Jaczko is correct, this would mean there's nothing
to stop the fuel rods from getting hotter and ultimately melting down. The
outer shell of the rods could also ignite with enough force to propel the
radioactive fuel inside over a wide area.... 阅读全帖 |
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w********s
发帖数: 343 | 32 Don't know why they mention this as a means to cope with radiation. Anyone
would like to explain?
Pentagon preparing for a nuclear worst-case scenario at Fukushima
By Chris Carroll
Published: March 16, 2011
WASHINGTON — If the deteriorating situation at a Japanese nuclear plant
veers toward a worst-case meltdown scenario, people across the country —
including 86,000 American servicemembers, civilian employees and their
dependents — could face an unprecedented atomic disaster.
The Pentagon on Wed... 阅读全帖 |
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s**********d
发帖数: 36899 | 33 事故等级啊。就像死几个人是特大交通事故，几个是重大。
chernobyl大泄漏是7级。
三哩岛melt down毁堆轻微泄漏是5级。
现在日本6级。马上就要7级了。而且很可能比chernobyl还厉害。 |
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D*********t
发帖数: 745 | 34 基本上是没事，就是melt down也就是毁了那一块地方,大家都安了吧。不过这个对核电
产业打击是很大的，另外，估计你再怎么宣传安全，如果有别的选择的话，大家也不愿
意住在核电站周围了。 |
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s****i
发帖数: 2993 | 35 Chernobyl the melt down went through the bottom. that's why they risked
10000 miners' life to make another concrete bottom. |
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f****l
发帖数: 8042 | 36 Some of the maneuvers seemed at odds with the most startling assertion
by Mr. Jaczko (pronounced YAZZ-koe) that there was little or no water in
the pool storing spent nuclear fuel at the No. 4 reactor, leaving fuel
rods stored there exposed and bleeding radiation into the atmosphere.
His testimony before Congress was the first time the Obama
administration had given its own assessment of the condition of the
plant, apparently mixing information it had received from Japan with
data it had collect... 阅读全帖 |
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j*n
发帖数: 1205 | 37 我高温气冷堆可避免类似日本核事故
已在清华建造了模拟环境对设备进行试验
来源：科技日报 2011-03-17 李艳 陈磊
日本大地震引发的福岛核电站事故，让全世界对核电安全的关注提到了前所未有的
高度，也引发了国内对核电发展的思考。有关专家今天介绍，我国高温气冷堆具有第四
代核能系统安全特性，可避免类似事故发生。
此次发生事故的福岛核电站主要采用的是第二代核电系统，我国科技重大专项“大
型先进压水堆及高温气冷堆核电站”专项主要研究的方向——大型先进压水堆核电站、
高温气冷堆核电站则分别属于第三代核电系统和第四代核电系统的范畴。
现代核电技术应对核电站出现的紧急事故通常有三种办法：一是进一步增加供电的
方式和可靠性，也就是后来的二代改进型；二是把水放在高处，利用重力让水自流到堆
芯，也就是三代“非能动”技术；三是干脆改变堆芯的物理特性，大大降低单位空间堆
芯发出的能量，最终使得反应堆不需要冷却水或者其他冷却剂，自己就能够把热量散发
出去，使核燃料不受损。
清华大学核能与新能源技术研究院院长兼总工程师张作义告诉记者，我国高温气冷
堆采用的就是第三种方式。它的功率密度是压水堆的1/30，产... 阅读全帖 |
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b**********n
发帖数: 2812 | 38 With Quest to Cool Fuel Rods Stumbling, U.S. Sees ‘Weeks’ of Struggle
By NORIMITSU ONISHI, DAVID E. SANGER and MATTHEW L. WALD
TOKYO — Amid widening alarm in the United States and elsewhere about Japan
’s nuclear crisis, military fire trucks began spraying cooling water on
spent fuel rods at the country’s stricken nuclear power station late
Thursday after earlier efforts to cool the rods failed, Japanese officials
said.
The United States’ top nuclear official followed up his bleak appraisal of
t... 阅读全帖 |
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b*A
发帖数: 1304 | 39 我也觉得日本政府还凑合。原子炉melt down不是人多就行的，填180个老头上去已经是
很不人道了，最后还不是要按规律来，等电等水炉子自己灭了。
半天之内，炉子周围20公里清场，而且还是在刚刚地震、海啸的混乱地区清场，还是很
让人惊讶的。
西方最大的问题是人力太贵。如果从中国紧急引进一批临时护工，什么问题都没了。 |
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j****y
发帖数: 1714 | 40 http://www.sublimeoblivion.com/2011/01/16/top-10-powerful-count
2011/
The Chinese have an interesting concept that quantifies Great Power
status, called Comprehensive National Power (CNP). This index is
produced by processing the economic, military and cultural factors that
make countries powerful: GDP, technological development, number of tanks
and ICBM’s, as well as “softer” factors such as influence on global
media and international institutions. Since I’m not a think-tank, I
can’t be bothere... 阅读全帖 |
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h****i
发帖数: 302 | 41 http://www.smh.com.au/environment/japan-on-maximum-alert-over-n
Japan's Prime Minister Naoto Kan says his government is in a "state of
maximum alert" over the crisis at the stricken Fukushima nuclear plant.
Jiji Press reports that Kan has told a lower house budget committee meeting
that the situation "continues to be unpredictable" and that the government "
will tackle the problem while in a state of maximum alert", Jiji reported.
Mr Kan's comments came as the operator of the stricken plant said... 阅读全帖 |
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c*****r
发帖数: 8227 | 42 http://www.guardian.co.uk/world/2011/mar/29/japan-lost-race-sav
The radioactive core in a reactor at the crippled Fukushima nuclear power
plant appears to have melted through the bottom of its containment vessel
and on to a concrete floor, experts say, raising fears of a major release of
radiation at the site. |
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c******2
发帖数: 4019 | 43 刚收到一个日本客户的来信[关于地震]
最近资讯图片很多，关于地震、海啸后日本人秩序尽然地排队打电话、坐车、购买食物
，从中的确看到这个民族的可怕之处。素质比国人高，这个我就不多说了（见仁见智吧
~）
以下是一个日本客户刚给我们写信报平安。
从话语中隐约可以看到小日本的那种淡定，，，
Dear Mr.***,
You might have known about disaster in Japan, fortunately we are all safe.
Please don't worry.
When the earthquake happened, I was at factory of customer which was old and
small.
Big roll kept about 6 minutes. Some people prevented from damaging lenses,
some put off fire for melt pitch.
I and two guys in a meeting room evacuated under a table ... 阅读全帖 |
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t******t
发帖数: 15246 | 44 最新发现与创新
已在全球电信解决方案处于领先地位的华为技术有限公司，在今天“世界电信日”
之际，宣布推出两款业界最高密度的xDSL板卡——48路 COMBO板卡及64路VDSL2板卡。
这两款板卡的推出将为各国电信运营商铜线接入系统的升级，构筑高效绿色网络提供有
力的技术支撑。
目前，全世界电信运营商的网络最后一公里的接入方式仍是铜线接入唱主角，减少
这部分系统的工程施工、维护费用，降低设备功耗等对减少运营商的运营投入至关重要。
华为本次发布的COMBO板卡集ADSL2+、语音和分离器三大功能于一体，可显著减少
设备机房面积，简化铜线布线工程，降低设备整体功耗，在提供宽带接入的同时，也把
传统的TDM（时分复用）语音系统升级为面向未来的VOIP系统。COMBO板卡的推出，极大
提升了设备集成度，也降低了相关设备30%以上的机房面积占用。
据介绍，当现在普遍采用的ADSL无法满足业务快速发展的带宽需求时，VDSL2可以
提供超过50M的带宽，利用现有的铜线网络，满足高带宽视频业务的需求。华为本次推
出的64路高密节能的VDSL2板卡，支持分离器内置和外置两... 阅读全帖 |
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q*******n
发帖数: 360 | 45 hehe, you are so hot that your hot can melt the world |
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w*********g
发帖数: 30882 | 46 四 “美国例外论”与美国文化的全球扩张
在美国盎格鲁-撒克逊新教文化信仰体系中，“美国例外论”具有很重要的一席之
地。这种把美国与世界上其他国家从本源上区别开来的命题，旨在为美国对世界承担特
殊责任或义务提供一种合理的解释，说穿了无非是为美国在履行上帝赋予的一种特殊“
使命”的名义下以各种形式向外扩张进行辩解。因此，“美国例外论”不仅是美国持续
不断的全球文化扩张的意识形态根源之一，而且使美国政府从中寻找到了合理解释的依
据。
美国文化的核心是新教伦理，这是经过长期的历史演变而形成的。因此，与“美国
例外论”密切联系在一起的使命观自然就体现在信仰新教的美国人的身上。在美国历史
上，他们把宗教的狂热与在国外传播美国文化有机地结合在一起，形成了美国文化向非
基督教世界扩张的几次大的浪潮。美国文化向外传播很长时期多是由基督教传教士作为
载体的，美国人甘愿到陌生落后的地方以自身的文化价值观来影响当地的发展，很大程
度上是从其所信仰的宗教中获得鼓舞或驱动力。美国宗教团体在这方面对美国人的号召
力丝毫不亚于美国各级政府，它们那些充满宗教激情的语言固然主要是出于皈依非基督
教世界和实现基督教在整个世... 阅读全帖 |
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c*****r
发帖数: 8227 | 47 Remember Fukushima, the worst nuclear catastrophe in the last 20 or so years
which soon will surpass Chernobyl in total radioactive emissions into the
environment? Well, the radiation in the now officially melted down Reactor 1
has just hit the highest ever reading since the crisis began, or 204
sieverts/hour, recorded in the drywell. Not Micro. Not Milli. Sieverts. It
appears the "excuse" that the counters are broken isn't being used this time
, although we are confident that the "spurious read... 阅读全帖 |
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c*****i
发帖数: 11737 | 48 China needs no foreign help to feed itself
China can meet the demands of its growing population without importing grain
from elsewhere, says Peng Gong.
Peng Gong
China has a long-standing ambition to be self-sufficient in grain — rice,
wheat, maize (corn) and soya beans — yet it imported some 95 million tonnes
last year, about 17% of its domestic production. This raised concerns that
its grain imports would rise, and push up the price of food. These fears
were highlighted by Lester Brown of the ... 阅读全帖 |
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e**s
发帖数: 4638 | 49 Level 4: Accident with local consequences
Impact on people and environment
Minor release of radioactive material unlikely to result in
implementation of planned countermeasures other than local food controls.
At least one death from radiation.
Impact on radiological barriers and control
Fuel melt or damage to fuel resulting in more than 0.1% release of
core inventory.
Release of significant quantities of radioactive material within an
installation with a high probabil... 阅读全帖 |
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k*****r
发帖数: 21039 | 50 2008年的花儿街melt down, 没有一个投行的老总进监狱。
哈哈。 |
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