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全部话题 - 话题: decaying
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f******1
发帖数: 727
1
来自主题: Parenting版 - 数学需要超前学吗?
本来如果你们稍微正常一点,我倒是有advice,不过此刻,我耳边回荡起了你们信誓旦
旦我家小主会被decay的说辞, 这就是令人非常费解和颇感矛盾的地方:
回到你自己的疑惑上,既然你觉得有能力早期推快一点,为啥你就觉得别人家早期已经
快了一拍的反倒落入你发明的decay理论,而你家被硬推上去的,反而accelerate呢?
发明一个公理,是要放之四海而皆准之的,不能如下的双重标准:
decay的都是别人家的好苗子,凡是94分的也是跳楼的命
accelerate 的都是自己家的,不仅没有decay,更可怕的是考了49分还能管理得了94分
的。而且49分的因为教养好,容易找到朋友---这都是你们刚刚高谈阔论过的吧?
既然49分都这样NB了,那你还推个什么劲儿呢。。。。是想推成decay的啊,还是想推
成跳楼的啊,还是想推成找不到朋友的啊?
你自己说,这个高楼盖下来,一路回望,到底谁在思维发散,谁在人格分裂?
j***b
发帖数: 5901
2
来自主题: Stock版 - 熊能三巨头
这么说吧,3x etf time decay厉害的时候完全是在这种极端气候下。平时风平浪静的时候time decay远没有option的time value高。赚这个time decay不如去short option赚time value。
所以,赚3x etf的time decay基本上就是要在time decay最严重的时候stop。
B**********r
发帖数: 7517
3
来自主题: Stock版 - TZA请不要跌到26以下
I was talking about the decay, and you talked about risk control. Risk
control is always necessary, and nobody disagrees.
Now let us focus on Volatilitydecay. I ask you a question. If the market is
up 2 consecutive days, 10% each day, you said there is no decay. You said if
it drops 2 consecutive days, there is no decay. Now do some calculation,
please confirm there is no decay after 2 up days and then 2 down days. If
you cannot, then just admit you do not understand the volatility decay.
It is ... 阅读全帖
S*********g
发帖数: 24893
4
这次回调将要改变我的人生,三天输了22%,马上要离婚了
suyimasai (ss) 于 (Thu May 20 18:32:23 2010, 美东) 提到:
首先声明这绝对不是坑,换了个ID因为怕被熟人认出来。
星期二的时候不知哪根筋搭错,买入500股TNA@55.00,现在已经损失6000多了,急死
我了. 你要知道,我和老婆都是F1和博后,辛苦5年只有这么点存款,都被我搭进去了
,今天我难过的连午饭都没有吃,每五分种就接到老婆电话或email,说如果亏的钱回
不来就要离婚,还骂我$@#!,我知道我买的有股票有time decay,请问,这种情况
下还要不要hold,还是割了?今晚还不知到去哪里睡了,下午paper都看不进去,请大
家真心提些建议。真的不是坑,我都要哭了
☆─────────────────────────────────────☆
liliwater (lyrist) 于 (Thu May 20 18:33:24 2010, 美东) 提到:
买点教训吧,工作乐,这些都是小钱。
☆─────────────────────────────────────☆
... 阅读全帖
d********1
发帖数: 3828
5
来自主题: Stock版 - TNA 太牛了
总有人迷信所谓的“Decay”。其实在牛市,iwm波动很小,这个时候“decay”极其微
小。
比如TNA 1%的波动,“decay”才0.005%左右。也就是说你short $10000的TNA,它第
一天涨1%,第二天跌1%,你才赚了1块钱。
别看tza跌的那么狠,其实很大一部分并不是“decay”,而是单纯的趋势(iwm涨)。
至于“decay”的那部分,绝大多数都是发生在波澜壮阔的熊市,而你如果在那时重仓
short tza,风险极大。每天账户的起伏够你承受的了。
当趋势存在的时候,short tza是比不过直接long iwm的,因为相当于不断减仓,限制
收益。
S******6
发帖数: 3138
6
来自主题: Stock版 - Why you don't buy and hold UWTI (ZZ)
这位的主要意思是说, 如果你不是为了 Day Trading, 远离 UWTI.
(ZZ)
See :
http://www.reddit.com/r/wallstreetbets/comments/2sioam/why_you_
Of course there's time decay, it's a daily leveraged ETF. The thing is, you
could still make a killing buying and holding DWTI, even with the decay. The
opposite of course happened with UWTI, and the negatives of time decay hurt
even worse, but case in point is this.. If you bet on a market trend
continuing in one direction like oil has, you'll make some good money, but
that's only... 阅读全帖
G**********e
发帖数: 11693
7
来自主题: Fashion版 - 今年的化妆品终于跳完了
真是倍感轻松啊!
兴奋的等待package寄到!
跳的都有。。。。。。。。
tarte lipsurgence 5 pack
make up for ever liquid foundation value set
bareminerals foiled eye
sephora collection lash dash
sephora collection give me some lips
urban decay liquid eye liner blue and purple
urban decay eye primer
urban decay naked palette
urban decay tinted moisturizer
thebalm nudetude palette
tokidoki purple shadow palette
shisheido eye shadow quad
missha bb cream
stila liquid eye liner pen
missha eye shadow, blue and green
kat von d true rom... 阅读全帖
g****e
发帖数: 612
8
来自主题: Astronomy版 - Status for Iridium payloads
http://users2.ev1.net/~mmccants/tles/iridium.html
Iridium status as of 2004 June 25
=================================
Iridiums not listed in the following table are thought to be stable
in orbit and capable of generating flares. Note that Iridium 79
(NCat 25470) decayed Nov. 29, 2000. Iridium 85 (NCat 25529) decayed
Dec. 30, 2000. Iridium 48 (NCat 25107) decayed May 5, 2001.
Iridium 27 (NCat 24947) decayed Jan. 31, 2002. Iridium 9 (NCat 24838)
decayed Mar. 11, 2003. On Jan. 29, 2004, Spaceco
g****e
发帖数: 612
9
来自主题: _Astronomy版 - Status for Iridium payloads
http://users2.ev1.net/~mmccants/tles/iridium.html
Iridium status as of 2004 June 25
=================================
Iridiums not listed in the following table are thought to be stable
in orbit and capable of generating flares. Note that Iridium 79
(NCat 25470) decayed Nov. 29, 2000. Iridium 85 (NCat 25529) decayed
Dec. 30, 2000. Iridium 48 (NCat 25107) decayed May 5, 2001.
Iridium 27 (NCat 24947) decayed Jan. 31, 2002. Iridium 9 (NCat 24838)
decayed Mar. 11, 2003. On Jan. 29, 2004, Spaceco
a*****o
发帖数: 209
10
来自主题: History版 - 满版的方言
Positron emission or beta plus decay (β+ decay) is a particular type of
radioactive decay, called beta decay, in which a proton is converted to a
neutron, and it releases a positron and a neutrino.
s***i
发帖数: 600
11
我觉得没停。
大家都说现在是decay heat.我觉得不对。decay heat 下降的很快。
T0 到一个小时 产出的decay heat 大于其后产生的heat的总和。
shutdown之后柴油坚持了一个小时,电池坚持了8个小时。剩下的decay heat都是原来的
1/10以下。不会有问题。
我估计就是裂变没有完全停下。
希望有内行讲一下我说的对不?
http://en.wikipedia.org/wiki/Decay_heat
w******t
发帖数: 16937
12
Radon is a chemical element with symbol Rn and atomic number 86. It is a
radioactive, colorless, odorless, tastelessnoble gas, occurring naturally as
the decay product of uranium or thorium. Its most stable isotope, 222Rn,
has a half-life of 3.8 days. Radon is one of the densest substances that
remains a gas under normal conditions. It is also the only gas under normal
conditions that only has radioactive isotopes, and is considered a health
hazard due to its radioactivity. Intense radioactivity... 阅读全帖
t*******r
发帖数: 22634
13
来自主题: Parenting版 - [bssd]我的推娃原则
其实大家都 decay,只是有些是按既定方针 decay,所以不觉得啥。。。俺家一年级结
束就计划开始依次逐步 full decay 掉 chess,二年级结束就计划果断迅猛 half
decay 掉 fiction reading。。。
Y********d
发帖数: 1478
14
潮水哥哥,让我狠狠地赞你一把,就是喜欢你这种孜孜以求的钻研精神和从具体到抽象
的理论能力。
读完你的帖子,我想到了一个人,以及他的理论,就是Jean Piaget的Theory of
Cognitive Development, 认知发展论。我是为了写teaching philosophy曾经无意看
到过这个理论。看了你最近的帖子,今天又去wiki再度拜读,感慨great minds think
alike。要知道,这个认知发展论虽然后来有很多的批判和改进,但是一直被公认为20
世纪发展心理学上最权威的理论。
更有意思的是,Piaget的研究方法不采用当时流行的等实验组及多人资料统计的方式,
而采用对于个别儿童(他自己的女儿)在自然的情境下连续、细密的观察纪录他们对事物
处理的智能反应,这个和你指导大娃的经历也非常相似。
这个理论的主要思想是,个体自出生后在适应环境的活动中,吸收知识时的认知方式以
及解决问题的思维能力,其随着年龄增长而改变。
Piaget把儿童的认知发展分成以下四个阶段:
1. 感知运动阶段 (感觉动作期,Sensorimotor,0-2岁)1岁时发展出物体恒存... 阅读全帖
l*****e
发帖数: 2447
15
那个老家长我喊人姑,孩子很大了。。。人的学习上次我检查的时候过了decay点还一
点没有decay。。。语文当然需要一辈子学习,因为语文很大程度是由智慧成熟度决定
的。。。象我们杨康这种智慧老不成熟,等着decay的孩子多的是。。。不过有了基础
的阅读能力,就容易培养学习习惯,能够受益终身,并不是说以后就不学了,只是孩子
具有了一定的自我防decay能力。。。每个孩子轨迹不同,楼主孩子既然这么早就ready
了,把他的学习能力推到位,也符合我们静淌派躺到ready就推的思路,呵呵。
Y********d
发帖数: 1478
16

潮水哥哥,觉得你是版上脾气超好的人之一,所以容我建议一下吧。
其实上次码了半天的字给你写的这个贴子,
http://www.mitbbs.com/article/Parenting/32619593_3.html
就是想隐含的建议,要不把你的decay论改个名字吧?
你说的主要意思和Theory of Cognitive Development一致,强调的是儿童的认知发展
的阶段,从一个阶段到另外一个阶段在思考模式上会表现出质的不同。所以上一个阶段
领先,不一定代表下一阶段领先,那就是所谓的decay;但是也可能上一个阶段不领先
,下一阶段傲视群雄,你自己不都提供自己做实例了吗?
那么只说decay未免显得有些以偏概全,而且容易让不知道前因后果的人觉得你
pathetic。其实也就是个title的事情,但是如你自己一直强调的那样,政治正确也很
重要,尤其是你马上要版务to-be了。反正title inflation这个年头也不是个事儿,要
不就把你的decay论改成中性的儿童认知发展阶段论,或者正面积极的开窍论,如何?
t*******r
发帖数: 22634
17
解释一下 decay 的用词原因:
decay 这个词,是对粒子物理,具体而言,对 quantum
chromodynamics 的 unscientific 的戏言。
具体而言:
把摸得着的 knowledge / capability 这种 tangibles,
unscientific 地比喻为 Quark;
把摸不着的 teachable 这种 intangibles,unscientific
地比喻为 Gluon;
把从上一阶段往下一阶段前进,unscientific 地比喻为从
Quark–Gluon plasma 里 build up structured-matter。
而 decay,则是 unscientific 地戏言,在从 Quark–Gluon plasma
里 build up structured-matter 的时候,犯了心急火燎一口气装了
太多的 Quark、但没有配置相应的足够合适的 Gluon 的错误,导致
inherently unstable structure。而 inherently unstable
structure 最终是经不起 ti... 阅读全帖
b******r
发帖数: 16603
j***b
发帖数: 5901
19
来自主题: Stock版 - short三倍反向etf一个问题
其实1-2个月以内的time decay很小。
3x etf的time decay被严重夸大了。主要是因为这些东西引入之后正好赶上了股市的一次10年一遇的大起伏。这样的大起伏是最能造成time decay的。所以大家把这个看在眼里。
而且3x etf的option价格已经把这个decay算在内了。你可以对比3x etf的option和 underlying 的etf option。离money同样距离的option都是underlying 的option更贵。

shares.
short
You
B**********r
发帖数: 7517
20
来自主题: Stock版 - short三倍反向etf一个问题
Let us look at the ZSL, a 2X ETFs. It is decaying very fast, The time decay
of ZSL/AGQ is about 12% each in 3 months. With ZSL at $19.45, we expect ZSL'
s fair price will be at about $17 in August.
Apparently, the market has not priced in this time decay in the options.
August $17 calls are at $5.10 and August $17 puts are $2.85.
一次10年一遇的大起伏。这样的大起伏是最能造成time decay的。所以大家把这个看在
眼里。
underlying 的etf option。离money同样距离的option都是underlying 的option更贵。
h****n
发帖数: 3447
21
对头,本来就没有什么price in的问题。
只是因为要reflect -3X和 3X,算法上由于目标价格的波动会导致nX ETF本身value
decay.因此short FAS 和 long FAZ的区别在于short FAS就和FAS的 decay站在一侧,
long FAZ就和FAZ的 decay站在了对立面。也正是这个数学上必然的规律,才有“short FAS比买FAZ要好”的说法。
由于现在市场波动剧烈,这个decay尤为明显。举个极端的例子。市场一天上一天下,周而复始,过不了多久,FAS和FAZ都讲趋近于"0"。可以看出short FAS要好过long FAZ.

3x
j***b
发帖数: 5901
22
People think fas has time decay, so short fas is safer. But it's actually
not. In a bull market, the trend by far overcomes the time decay effect. Decay of fas is already minimal if the market stays flat. If the market has any uptrend at all, fas won't decay.
h****n
发帖数: 3447
23
如果不是day trade, 3x ETF本身没有任何safe可言。随便一个趋势相反,几天
position就腰斩了。我们这里只是说他们具有decay的特点,不是说这个特点就能够拿
来赚钱了。
LZ不理解为啥有种说法 short FAS比long FAZ 好。我仅仅是回答了这个问题。因为表
面看起来是一样的呀.如果是1X ETF,效果上就没有区别了呀,因为是3X,有这个decay
在里面,才有区别的。仅仅是为了解答LZ的疑问。
不是day trade,3X ETF都不应该碰的。谈论一个和另一个那个更有risk真的没啥用呀。

Decay of fas is already minimal if the market stays flat. If the market has
any uptrend at all, fas won't decay.
j***b
发帖数: 5901
24
来自主题: Stock版 - Goog有什么新闻?
If the market keeps flat, then faz decays faster than fas. This is because "
mathematically", the market is also "supposed" to decay. You see if the
market goes up 10%, then goes down 10%, it becomes .9*1.1=.99, a decay of 1%
. So if the market can keep flat, that's like there is a "upward trend" to
counteract the "natural" decay. This "upward trend" favors fas.
W******r
发帖数: 789
25
来自主题: Stock版 - 讨论一下option的gamma和theta
option的gamma和theta之间有一个trade-off。如果你买option,那么你有convexity的
优势,但是要go against time decay。如果你卖option,那么你有time decay的优势
,但是要go against convexity。似乎大部分option的书和网上的资料都是认为time
decay比convexity重要,主张以卖为主。但是我个人的经验却似乎不是这样。虽然卖
option有time decay的优势,但是因为go against convexity,一旦错了会输得很惨。
大家对此怎么看?
p*******o
发帖数: 1464
26
来自主题: Stock版 - TNA 太牛了
明白了,今天是个观察decay的好时间,和2月20日比tna的确没有什么decay,tza
decay了2%多,做空难啊。

decay
d*****g
发帖数: 978
27
来自主题: Stock版 - 看到了那么多人在long UVXY,
发行商的盈利来源:
1. 0.95%年费,会按天算在每个账号上
2. 他们的资产会进行固定投资,比如国债或固定收益债券, 他们的capacity已经缩水
很多了, 总是有人快进快出,不过夜, 如果这样持续跌下去的话就没人买了吧,所以
只有扩大capacity才有有更多人买,买的人多券商才赚的多,所以他们应该不希望行情
一直持续下去,而是有波动才好,最好是大起大落
3. uvxy 1年前40刀,目前15.5, 而spy仍然是210,损失了62% 目前还有Assets Under
Management $1.09 B
这62% 的损失只有不到3%是年费, 而contango decay,震荡decay和各种decay构成了59
%的损耗,相当惊人, 不知道这些decay怎么算出来的, 不过加入股市暴跌, uvxy回
到40还是很快的, 这个东西确实不是青蛙玩的了的
source:
http://sixfigureinvesting.com/2015/03/how-does-uvxy-work/
http://www.etf.com/UVXY
s**w
发帖数: 499
28
来自主题: Stock版 - SVXY和TQQQ能长期持有吗?
TQQQ的损耗叫着Leveraged Decay :
https://keepofin.blogspot.com/2013/08/leveraged-decay.html
SVXY的收益来源叫着contango。SVXY也有decay,但它的contango超过decay,所以最后
它有增值。
这两种损耗也被称为振荡损耗和延期损耗。
http://www.mitbbs.com/article_t/Stock/34584675.html
l**t
发帖数: 6971
29

Roland号称可以。是不是高级一点儿的digital piano就行了?
Expressivity according to the player’s touch
Pianos produce differences not only in volume, but also subtle variations in
tone color, depending on how forcefully the key is struck. Using Roland’s
latest technology, the SuperNATURAL piano sound engine delivers natural and
seamless changes in tone color in response to the player’s touch. Its
expanded dynamic range supports the most advanced and subtle techniques,
just as one would expect in an acoustic grand ... 阅读全帖
e*i
发帖数: 10288
30
General answer : NO.
Unless your lot is 1 acre or more.
I did some research for my daughter last year. :P
ARTICLE 2.01 GENERAL PROVISIONS*
Sec. 2.01.001 Dangerous wild animals
Dangerous wild animals, as defined in V.T.C.A., Health and Safety Code,
section 822.101, shall be regulated in accordance with the provisions of V.T
.C.A, Health and Safety Code, chapter 822, subchapter E, section 822.101 et
seq. (Ordinance adopting Code)
ARTICLE 2.02 LIVESTOCK AND FOWL*
Division 1. Generally
S... 阅读全帖
e*i
发帖数: 10288
31
General answer : NO.
Unless your lot is 1 acre or more.
I did some research for my daughter last year. :P
ARTICLE 2.01 GENERAL PROVISIONS*
Sec. 2.01.001 Dangerous wild animals
Dangerous wild animals, as defined in V.T.C.A., Health and Safety Code,
section 822.101, shall be regulated in accordance with the provisions of V.T
.C.A, Health and Safety Code, chapter 822, subchapter E, section 822.101 et
seq. (Ordinance adopting Code)
ARTICLE 2.02 LIVESTOCK AND FOWL*
Division 1. Generally
S... 阅读全帖
G**********e
发帖数: 11693
32
来自主题: Fashion版 - 来share deals!很全!
也是我从别地方copy过来的
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), DermStore (7.5%)
Free Shipping, Coupon Codes, GWPs
APOTHICA: Free shipping on orders of $49+
BATH & BODY WORKS: 20% off with code 20HOLIDAY11, expires 11/27.
BEAUTY.COM: New Customers – get $5 off $35 or $10 off $70 on your first
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l*y
发帖数: 21010
33
【 以下文字转载自 LeisureTime 讨论区 】
发信人: ldy (大才001), 信区: LeisureTime
标 题: 韩国女画家lee jinju谈论丝袜在她的画作中的含义
发信站: BBS 未名空间站 (Wed May 7 20:30:04 2014, 美东)
GH: Okay, let’s break them down a bit. Can you give an explanation about
the female figure within your works? They all have similar appearances.
LJJ: First of all, I loved to draw since I was young. I loved to draw people
and their facial exprerssions and impressions in particular... and later I
realized that these two characteristics make the person as wh... 阅读全帖
l*y
发帖数: 21010
34
GH: Okay, let’s break them down a bit. Can you give an explanation about
the female figure within your works? They all have similar appearances.
LJJ: First of all, I loved to draw since I was young. I loved to draw people
and their facial exprerssions and impressions in particular... and later I
realized that these two characteristics make the person as who they are. So
I thought that I should draw the people’s faces neutrally and without any
expressions, so that they are not biased in any way. ... 阅读全帖
a**y
发帖数: 6501
35
来自主题: Midlife版 - [合集] Good morning.
☆─────────────────────────────────────☆
jaff1973 (jaff) 于 (Tue Dec 1 07:53:39 2009, 美东) 提到:
☆─────────────────────────────────────☆
jaff1973 (jaff) 于 (Tue Dec 1 07:54:27 2009, 美东) 提到:
Why Did I Laugh Tonight?
Why did I laugh tonight? No voice will tell:
No God, no Demon of severe response,
Deigns to reply from Heaven or from Hell.
Then to my human heart I turn at once.
Heart! Thou and I are here, sad and alone;
I say, why did I laugh? O mortal pain!
O Darkness! Darkness! ever must I ... 阅读全帖
D*****r
发帖数: 6791
36
来自主题: TrustInJesus版 - 查经贴-使徒行传
Acts 13:13-52 In Pisidian Antioch
13From Paphos, Paul and his companions sailed to Perga in Pamphylia, where
John left them to return to Jerusalem. 14From Perga they went on to Pisidian
Antioch. On the Sabbath they entered the synagogue and sat down. 15After
the reading from the Law and the Prophets, the synagogue rulers sent word to
them, saying, “Brothers, if you have a message of encouragement for the
people, please speak.”
16Standing up, Paul motioned with his hand and said: “Men of Israel a... 阅读全帖
f**d
发帖数: 768
37
来自主题: Neuroscience版 - eBook: From computer to brain
这是一本计算神经科学的优秀著作,全文拷贝这里(图和公式缺),有兴趣的同学可以
阅读
如需要,我可以分享PDF文件(--仅供个人学习,无商业用途)
From Computer to Brain
William W. Lytton
From Computer to Brain
Foundations of Computational Neuroscience
Springer
William W. Lytton, M.D.
Associate Professor, State University of New York, Downstato, Brooklyn, NY
Visiting Associate Professor, University of Wisconsin, Madison
Visiting Associate Professor, Polytechnic University, Brooklyn, NY
Staff Neurologist., Kings County Hospital, Brooklyn, NY
In From Computer to Brain: ... 阅读全帖
d*b
发帖数: 21830
38
人这是研究rod产生的decay heat, decay当然有heat, 谁说decay没heat?
d*b
发帖数: 21830
39
人这decay不是你说的那同位素decay, 人说的decay是chain reaction的一部分。
d*b
发帖数: 21830
40
来自主题: Military版 - 科普:核反应堆要三年才能冷却
fission是一个原子核分裂成2个,decay是一个原子核分裂出一个原子核和光子等粒子
。如果一个Cs-137分裂成2个原子核,那是fission而不是decay.
fission也有自发,decay也有人工。你连核物理的基本概念都不清楚。不懂就别jjww了。
d*b
发帖数: 21830
41
来自主题: Military版 - 科普:核反应堆要三年才能冷却
我这是给你解释fission和decay的区别,并不是说一个Cs-137能分裂成2个原子核(当
然,heavy ion experiment成天都做这类实验)为什么fission和decay有这么大的区别
?decay 1900年间就发现了,fission要等到1945年?
d*b
发帖数: 21830
42
来自主题: Military版 - 看来完全没有证据证明2次投毒
你丫整一文盲,biological half life是指人体内代谢的速度,这Thallium的代谢速度
怎么测的?用Thallium-201做tracer,这是nuclear medicine里很常见的测试。
我为什么要提这个?因为Thallium的updake有无数现成的文献,你找到update的数据就
可以建立体内的decay模型,这decay不是你说的同位素decay,由此找出摄入数量,摄入
时间。
比如计算的摄入数量是100g,但清华的Thallium只丢了20g,那显然不是清华丢的
Thallium了。
你的明白?
b**k
发帖数: 3472
43
来自主题: Military版 - Potential Nobel-prize project on-going?
China Builds Mammoth Detector to Probe Mysteries of Neutrino Mass
Jane Qiu*
View larger version:
In this pageIn a new window
Download PowerPoint Slide for Teaching
Heavy hitter. China hopes its planned JUNO detector, 38 meters across, will
be the first to nail which of the three neutrino flavors is heavier or
lighter.
CREDITS: (INSET) IHEP; (SOURCE) M. BLENNOW ET AL. ARXIV 1311.1822 (2013)
BEIJING—It isn't easy to weigh a ghost. After neutrinos were hypothesized
in 1930, it took physicists 67 ye... 阅读全帖
s*****n
发帖数: 1998
44
来自主题: Military版 - 英文叫Plagiarism
De Pretto used the expression m v 2 {\displaystyle mv^{2}} mv^2 for the
"vis viva" and the energy store within matter, where he identified v with
the speed of light. His formula precedes by two years, and is in agreement
with Albert Einstein's later formula E = m c 2 {\displaystyle E=mc^{2}}
E=mc^{2} for mass–energy equivalence, which was derived by Einstein as a
consequence of special relativity.
Radioactive decay
De Pretto's paper discussed the radioactive decay of uranium and thorium
and was ... 阅读全帖
s***h
发帖数: 487
45
大部分美华娃竞技体育,6 年级 decay 一次,10 年级 decay 第二次,两次以后能去
体育场的都不多了。
如果爆发力白肌不够、或者身高不够,除非是游泳长跑耐力运动,否则 6 年级就可以
一次把两次的都 decay 了。
当然推妈 oxytocin level 很高,说了也白说,就是灌水玩玩。


: 你哪里看见华人孩子才与体育活动少的?起码中小学里并没这个现象,华
人的娃
体育推

: 的也很厉害。当然NBA里是少些,但白人也少啊。

y******a
发帖数: 56
46
应该是Decay Heat 造成的,若控制棒复位不成功早就熔堆了。Decay Heat 在停堆后一
段时间内大概是反应堆满负荷热功率(或核功率)的3%左右。假如这个机组电功率是
700MW(日本这个机组估计不会低于700MW),满负荷热功率应该在2100MW左右,Decay
Heat就是60MW左右。60MW是个什么概念?所以停堆后的冷缺是核电站安全非常非常重要
的。
l****z
发帖数: 29846
47
Laura Ingraham关于美国文化衰落的新书《Of Thee I Zing》:我们能走出经济衰退,
打败恐怖分子,但最终我们还要面对自己的问题
Laura Ingraham Zings American Cultural Decay
Friday, 08 Jul 2011 02:41 PM
By Henry J. Reske and Ashley Martella
Cultural decay is eroding America’s greatness, noted radio host Laura
Ingraham tells Newsmax.TV as she ticks off a list of the signs of that
decadence: airline seats that shrink while Americans get larger, parents
saddling their children with ridiculous names, and people who can’t stop
twittering long enough to ... 阅读全帖
l****z
发帖数: 29846
48
Detroit's abandoned buildings draw tourists instead of developers
Detroit has seen an uptick in history buffs and photographers visiting its
ruins since its bankruptcy filing.
By Alana Semuels
December 25, 2013, 4:33 p.m.
DETROIT — He'd heard stories of ruin and blight, but that didn't prepare
Oliver Kearney for what he saw:
Prostitutes roaming the streets at 8 a.m., rubble-strewn parking lots
overrun with weeds, buildings taken over by bright pink graffiti, the
message scrawled on blackboards i... 阅读全帖
m****y
发帖数: 367
49
偶然路过本版 来汇报一下。。
后来上了保险,看了牙医。。。
因为不是很严重,就只作了检查,牙医说可以选择的是filling填充,如果有牙洞的话。
最近又常规检查看了牙医,继续这个话题,决定补牙。
(门牙有黑色decay的那颗已经掉了,长乐新的好牙,-----医生说一般旧牙decay不会
传染新牙。)
但是由于剩下的两颗decay的牙是后边的嚼齿,估计是最晚脱落的(11-12岁)就还要4-
5年,就决定补牙,以免坏道神经牙疼。。。拔牙。(拔牙后不利于涨的新牙的位置和
形状)。
现在到有问题是:
1, 小孩子的就牙到底不补牙的话能坚持到多久?还是一定必须要补牙?
2,补牙一颗的费用大约多少?我们的账单(两个地方,4个手影响的牙)需要1400$,我
们付20%,加上笑气(让小孩容易弄吧)的费用,我们要付400多刀,
是不是有点贵了?(一颗牙报价 resin/comp.3-surf-posterior 259$;)
麻烦哪位给说说???
多谢。。。
z***s
发帖数: 14
50
还是找原来的牙医协商解决吧。补牙后牙齿敏感很常见,尤其是用牙色材料补的牙,比
起传统的银汞合金更容易敏感,越年轻的越容易有感觉。 先调调咬合,检查有没有隐
裂,试试脱敏牙膏. 如果几个月后还不行的话,再找根管治疗专家 (endodontist)咨询
看是不是要做根管治疗.一般诊所会帮您负责一定的费用的,起码应该会免co-pay部分.
law suit 赢的可能性很小,除非你能证明在补之前这颗牙什么问题都没有 (although
you may not feel any discomfort). 可是看来至少旧的filling broken, 很可能有继
发龋,没有哪个牙医能预知decay到底有多深多大 (X-ray is only a guideline and
clinically decay is always larger than what we see on X-ray). 负责任的牙医会
把decay去净,如果您的牙神经末梢延伸的比较长的话,会很容易敏感的.
另外,根管治疗后,牙冠还是最好尽快做, 以免继发感染和牙齿裂开.
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