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全部话题 - 话题: spiral
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g********2
发帖数: 6571
1
August 22, 2016
How Obama Hoodwinked the Supreme Court on Obamacare
By Hollis Hurd
In the case of King v. Burwell, decided by the Supreme Court in June of 2015
, President Obama won the day by convincing six justices that Obamacare
would collapse if he lost. The case involved the so-called "individual
mandate," which imposes a financial penalty on those who neglect to buy
health insurance. To many observers, the wording of Affordable Care Act
seemed to impose the financial penalty only in stat... 阅读全帖
l****z
发帖数: 29846
2
来自主题: USANews版 - 医疗费用在巴马care通过后狂涨
More Obamacare Sticker Shock: HMO Rates Up 20%, EPO Up 18%, 12% Overall;
Death Spiral for Insurers?
If you did not have insurance before Obamacare, but do now, or if you are
heavily subsidized, you may consider Obamacare a blessing.
If you are not in those select groups, then you are highly likely to be
paying more for insurance now than before. And it's going to get worse. Some
plan types really take a premium hit.
Premiums Jump 12% On Average
Health Pocket reports Obamacare Insurers Propose 12... 阅读全帖
l****z
发帖数: 29846
3
来自主题: USANews版 - 关于巴马care的5个惊人事实
5 Devastating Obamacare Facts Every American Should Know
by Scot Vorse23 Nov 20150
Last week’s devastating Obamacare announcement by United Healthcare — it
expects to lose $600 million on Obamacare policies next year — further
confirms what conservatives have known and said all along: Obamacare is a
disaster.
The nation’s largest health insurer is even considering pulling out of
Obamacare altogether.
Below, then, are five devastating Obamacare facts every American should know
about President Bar... 阅读全帖
s*****t
发帖数: 1994
4
来自主题: Astronomy版 - Astronomy Picture of Day: Sprial Galaxy
Warped Spiral Galaxy ESO 510-13
Credit: Hubble Heritage Team (STScI / AURA), C. Conselice (U. Wisconsin / STScI) et al.,
NASA
Explanation: How did spiral galaxy ESO 510-13 get bent out of shape? The disks of many
spirals are thin and flat, but not solid. Spiral disks are loose conglomerations of billions of
stars and diffuse gas all gravitationally orbiting a galaxy center. A flat disk is thought to be
created by sticky collisions of large gas clouds early in the gal
s*****t
发帖数: 1994
5
来自主题: _Astronomy版 - Astronomy Picture of Day: Sprial Galaxy
Warped Spiral Galaxy ESO 510-13
Credit: Hubble Heritage Team (STScI / AURA), C. Conselice (U. Wisconsin / STScI) et al.,
NASA
Explanation: How did spiral galaxy ESO 510-13 get bent out of shape? The disks of many
spirals are thin and flat, but not solid. Spiral disks are loose conglomerations of billions of
stars and diffuse gas all gravitationally orbiting a galaxy center. A flat disk is thought to be
created by sticky collisions of large gas clouds early in the gal
c*****g
发帖数: 21627
6
来自主题: USANews版 - 疣太高盛迫害前员工
Michael Lewis: Did Goldman Sachs Overstep in Criminally Charging Its Ex-
Programmer?
A month after ace programmer Sergey Aleynikov left Goldman Sachs, he was
arrested. Exactly what he’d done neither the F.B.I., which interrogated him
, nor the jury, which convicted him a year later, seemed to understand. But
Goldman had accused him of stealing computer code, and the 41-year-old
father of three was sentenced to eight years in federal prison.
Investigating Aleynikov’s case, Michael Lewis holds a s... 阅读全帖
c*****g
发帖数: 21627
7
来自主题: USANews版 - 疣太高盛迫害前员工
版主,仔细看原文!
“If Person A steals a bike from Person B, then Person A is riding a bike to
school, and Person B is walking. A is better off at the expense of B. That
is clear-cut and most people’s view of theft. In Serge’s case, think of
being at a company for three years and you carry a spiral notebook and write
everything down. Everything about your meetings, your ideas, products,
sales, client meetings—it’s all written down in that notebook. You leave
for your new job and take the notebook with yo... 阅读全帖
q****x
发帖数: 7404
8
来自主题: JobHunting版 - An example of strategy pattern
/*
Is template method in parallel with strategy to abstract different algorithms? If so, how to modify the following example to template method?
*/
#include
using namespace std;
class Robot;
class Search {
public:
virtual void apply(Robot*) = 0;
};
class Linear: public Search {
public:
void apply(Robot*) { cout << "linear" << endl;}
};
class Spiral: public Search {
public:
void apply(Robot*) { cout << "spiral" << endl;}
};
class Robot {
public:
void go() { m_search->ap... 阅读全帖
d**e
发帖数: 6098
9
☆─────────────────────────────────────☆
oneid (Mobius) 于 (Fri Dec 28 19:12:49 2012, 美东) 提到:
比如careercup,glassdoor上每个公司那么多题,难道大家都做完了?
还是leetcode has OJ?比较容易发现code的问题?
但是大家觉得leetcode的题被问得几率比careercup上针对性的公司的题概率高么?不可
能把?
☆─────────────────────────────────────☆
luckynoob (菜鸟) 于 (Fri Dec 28 19:20:06 2012, 美东) 提到:
题目肯定是做不完的,重要的是实现一下一些重要方法吧,书还是要看的
☆─────────────────────────────────────☆
lolhaha (人生如棋,棋如人生) 于 (Fri Dec 28 19:21:35 2012, 美东) 提到:
careecup上的题你做得完吗?
那上面的很多回帖都有问题,没有正确答案

☆─────... 阅读全帖
l**********i
发帖数: 84
10
来自主题: JobHunting版 - p家新鲜电面面经summer intern
面了1小时15分,前几题感觉不错,结果被问到tcp vs udp的时候根本不知道是啥玩意
儿,估计是悲催了。哎,题目如下:
1.Can you talk a little about yourself first?
2.Why do you choose p?
3.Difference between linkedlist and array
4.In what condition do you use tree structure? How do you keep them balanced?
5.TCP protocol vs UDP protocol (have no idea)
6.How do you implement a hash table?
following up question:
Data structure; size; hashfunction; linkedlist vs hashtable in dealing with
collision
7.coding
print spiral matrix
Given a matrix of m x n elem... 阅读全帖
t*******r
发帖数: 22634
11
K 年级就会这些,确实是 profoundly gifted on math。
另外你说的那些,在美帝这里,有些超过四年级了。
我确信我们这里,四年级娃,负数运算还停留在 spiral 阶段。。。分数通分运算,我
没问过,但我猜可能也停留在 spiral 阶段。。。我晚上可以问一下俺娃。。。另外质
数可能也是 spiral 阶段,至少俺娃四年级中的时候的俺的感觉。。。俺可以晚上问一
下。
t*******r
发帖数: 22634
12
你太酸了。。。大多数 center daycare 和 preschool / private elementary school
,在 pre-K 结束时,差不多就是以 spiral 的姿势超前两个年级。。。因为那些学校
一般是在 pre-school 年级开始 spiral 公立学校 K 年级的内容。。。当然只是
spiral,不是真的狠学人肉计算器。。。
t*******r
发帖数: 22634
13
来自主题: Parenting版 - 其实希望孩子是天才的父母
个人民科看法,您也推点上档次的东东吧。。。
比如两岁半可以开始为 high order thinking skill 来 spiral 打
基础了,比如 PBS Kids:The Cat In the Hat / Wild Kratts
/ Cyberchase / Word Girl / Super Why 等等。。。当然看电视时间
别太长把娃给看傻了,看完也偶尔问问娃看了些啥。。。当然如果
对电视或者电子设备有顾虑的话,那自己照着电视节目演个皮影戏
好了。。。
另外可以玩玩 spatial toy,各种形状的积木和可以搭/拼的东东,
还有 jigsaw puzzle 可以开始 spiral 起来。。。chess 其实也
可以 spiral 起来,将来 5 岁的时候学起来容易一些。
还有就是多去去 playground 啥的玩玩。酱油运动总是重要的。
其他的幼儿园都会教,不用重复投资了。
t*******r
发帖数: 22634
14
来自主题: Parenting版 - 有个学物理的爸爸是多么重要啊
这个帖子的起头是跟五岁娃(高中以前 spiral 物理学阶段的娃),
讲鱼和水流流速的 word problem。。。而不是高中生坐在教室里
用公式解 USAPhO题目,更不是 PHD 灌 paper。。。压力 vs
压强的术语,是个错误。。。但对五岁娃(高中以前 spiral 物理学
阶段的娃)而言,也就是个 2nd order mistake。。。直接上公式,
而不理解公式背后的 physics law,还没有简洁而逻辑地 apply
模型回到最初的 word problem,那才是 1st order mistake。。。
当然,术语用错也是不应该的。。。实际跟五岁娃(高中以前的
spiral 物理学阶段的娃)讲的时候,应该避免压力压强这种术语。。。
最好是使用 layman's language,避免术语,侧重于逻辑和建模。。。
当然,网上灌水就顾不上那么多。。。主要还是没人付我小时数。。。
错了也不罚款,最多就是被嘲笑一下。。。
另外俺也不是今天脸皮薄,而是今天有闲发个添堵贴。。。其他忙的时候
就过去算了。。。
另外其实也不用道歉啥的,本来上网就是互相添堵玩的。。。
t******l
发帖数: 10908
15
你说的这些,如果不是指 spiral 一下,那都是 prealgebra 内容。正规系统开搞(指
不是东一榔头西一棒子的 spiral),普通娃多半得三年级以后。
这个你自己都说了 -- “会了加法以后”。
“会了加法” 至少得过了 place value 才算会,是不是?否则数字一大不就当机了?
另外 spiral 本质上属于 unstructured learning。首贴和这个线程主要是在讨论
structured learning。
t******l
发帖数: 10908
16
来自主题: Parenting版 - The Math Revolution
另外你是水车回帖不看帖。我的确 slow down 了。我把原来半小时的 spiral 概念,
slow down 成两周。第一周先 spiral 的姿势浅谈 trigonometry function 的概念,
然后再慢慢 spiral 的姿势浅谈 analytic trigonometry 的概念。

:我是真担心你把你娃教凌乱了hoho
:你要slow down
t******l
发帖数: 10908
17
来自主题: Parenting版 - 继续钢琴,还是换庄?
我觉得这本身是一件大好事。。。但是 pushy mama 们的问题,是把小学
里能 spiral 几个微积分术语,当成娃能把吉米多维奇飞速做下来不带上
厕所的。。。然后微信群里就发生了:小学如果不 spiral 那些微积分术语,
将来 8 年级上吉米多维奇时,就会哭晕在起跑线上的,那些动人传说。。。
这也就算了,关键是为了小学 spiral 几个微积分术语,pushy mama 们
还搞出整套烤肉拉天窗水果刀这种偏门战术。。。我在这里就问一句,你们
这些烤肉拉天窗水果刀这种偏门战术,将来能用来刷吉米多维奇习题集么?
所以古人云:魔鬼在于细节。而 pushy mama 们啥都没错,可惜只错了一
点点:就是 “过犹不及”。。。所以,满盘皆是谁家娃的眼泪在飞。。。
D*****a
发帖数: 810
18
来自主题: PennySaver版 - 本周Target几个deals (1/10-1/16)
Buy (2) Huggies Little Movers Diaper Pants Super Packs - BOGO 50% off @$26.
99
total = $40.49
Use 25% Off Huggies Little Movers Diaper Pants Target Cartwheel
ANd use (2) $2/1 HUGGIES Diapers (Jumbo Pack+) printable
Pay $26.37, get $5 catalina coupon for buying 2 Huggies
Final price: $10.68 each
Buy (2) Charmin Mega plus Ultra Strong Bath Tissue 12 pack - $13.99
And buy (1) Charmin Mega plus Ultra Soft Bath Tissue 12 pack - $13.99
total = $41.97
Use (3) $1/1 Charmin Ultra Soft or Stron... 阅读全帖
g******4
发帖数: 6339
19
The Housing Death Spiral Means A Mammoth One In Five Borrowers Will Default
A leading mortgage analyst predicts over 11 million homeowners will default
and lose their home if the government fails to take more radical
intervention.
“The death spiral of lower home prices, more borrowers underwater, higher
transition rates (to default), more distressed sales and lower home prices
must be arrested.”
......
Risk is so high in today’s real estate market that private money has
largely left the mortgage... 阅读全帖
r*********e
发帖数: 29495
20
华盛顿州东部之行 (4) - Pullman - Moscow - Lewiston - Walla Walla
结束了Steptoe Butte的行程,195一路南下,转270来到了Pullman,这里是晚上我们住
宿的地方。
第二天,早早醒来,到附近的华盛顿州立大学走走,作为华盛顿州的主要两所州立大学
,WSU的位置和UW比较起来是如此的偏僻。
大学正处于放假,校园人很少很少。


WSU的吉祥物,Cougar,还有他们的橄榄球场Martin Stadium,每年WSU和UW的橄榄球比
赛都是周内最重要的一场赛事。学校干净整洁,多数建筑都是由红色的砖建造成的,绿
树成荫的校园里,红绿搭配,很是养眼。
Pullman小城基本上就是围绕着这所大学,走在校园,有些地方可以直接看到远处城市的
边界和绿色的麦田。
回到旅馆,收拾收拾,又上路了。沿着270,一路向东,不到十英里,就已经跨过了华盛
顿州的州界,来到了爱达华州的境内,"爱达荷"来自印第安语,意为"山地的宝石"。这
词最初专指科罗拉多州派克斯峰内产宝石的矿区,后来泛指太平洋沿岸宝石矿区。爱达
荷州建立后,便成了该州的州名。该州... 阅读全帖
r*********e
发帖数: 29495
21
【 以下文字转载自 Seattle 讨论区 】
发信人: renaissance (ole), 信区: Seattle
标 题: 华盛顿州东部之行 (4) - Pullman - Moscow - Lewiston - Wall
发信站: BBS 未名空间站 (Tue Jun 3 12:15:42 2014, 美东)
华盛顿州东部之行 (4) - Pullman - Moscow - Lewiston - Walla Walla
结束了Steptoe Butte的行程,195一路南下,转270来到了Pullman,这里是晚上我们住
宿的地方。
第二天,早早醒来,到附近的华盛顿州立大学走走,作为华盛顿州的主要两所州立大学
,WSU的位置和UW比较起来是如此的偏僻。
大学正处于放假,校园人很少很少。


WSU的吉祥物,Cougar,还有他们的橄榄球场Martin Stadium,每年WSU和UW的橄榄球比
赛都是周内最重要的一场赛事。学校干净整洁,多数建筑都是由红色的砖建造成的,绿
树成荫的校园里,红绿搭配,很是养眼。
Pullman小城基本上就是围绕着这所大学,走在校园,有些... 阅读全帖
n******e
发帖数: 74
22
来自主题: Dance版 - Help: a technical question
yes, three-step turns.
我理解Musique mm的意思,做spiral (slow) 的时候,的确应该把重心完全放在
supporting leg(这里是右脚,左脚spiral to the right),但是下一步three step
turn (quick) 的时候,左脚就要立即迈出去做这个spin。
我的问题在于,重心太靠后(右脚),以至于从这一步的slow接quick的时候,感觉需
要停顿一下。这样我的turn就转得不够快,如果我自己试图转快一点,就会朝右边歪过
去。反而有时候我cheat一小下,比如重心不放那么後,可以从这个spiral的扭力上给
一个momentum,很快的转向左边做spins。
我不知道大家看得懂么?用语言的确很难描述。
h**c
发帖数: 2376
23
来自主题: LeisureTime版 - 梦中的风车 (我的翻译) (转载)
注:并没有全部按原文意思,诚惶诚恐中,希望喜欢这首歌的人别太抨我。:)
转贴到这里,一来答谢乐子等弟兄一直以来的厚爱,
二来。。风车兄最近很活跃,给他加油!~ :):)
下面是youtube和原歌词。谢谢大家。*_*
Round, like a circle in a spiral
Like a wheel within a wheel.
Never ending or beginning,
On an ever spinning wheel
Like a snowball down a mountain
Or a carnaval balloon
Like a carousell that's turning
Running rings around the moon
Like a clock whose hands are sweeping
Past the minutes on it's face
And the world is like an apple
Whirling silently in space
Like the circles that you find
In ... 阅读全帖
r*********e
发帖数: 29495
24
【 以下文字转载自 Seattle 讨论区 】
发信人: renaissance (ole), 信区: Seattle
标 题: 华盛顿州东部之行 (4) - Pullman - Moscow - Lewiston - Wall
发信站: BBS 未名空间站 (Tue Jun 3 12:15:42 2014, 美东)
华盛顿州东部之行 (4) - Pullman - Moscow - Lewiston - Walla Walla
结束了Steptoe Butte的行程,195一路南下,转270来到了Pullman,这里是晚上我们住
宿的地方。
第二天,早早醒来,到附近的华盛顿州立大学走走,作为华盛顿州的主要两所州立大学
,WSU的位置和UW比较起来是如此的偏僻。
大学正处于放假,校园人很少很少。


WSU的吉祥物,Cougar,还有他们的橄榄球场Martin Stadium,每年WSU和UW的橄榄球比
赛都是周内最重要的一场赛事。学校干净整洁,多数建筑都是由红色的砖建造成的,绿
树成荫的校园里,红绿搭配,很是养眼。
Pullman小城基本上就是围绕着这所大学,走在校园,有些... 阅读全帖
f*******y
发帖数: 2368
25
来自主题: Joke版 - 无聊
的确不一样,随便抽了两点在每个spiral中间部分的:
蓝色的spiral: R=117 G=177 B=218 明显偏蓝
绿色的spiral: R=70 G =226 B=125 明显偏绿
h**c
发帖数: 2376
26
来自主题: Prose版 - 梦中的风车 (我的翻译)
注:并没有全部按原文意思,诚惶诚恐中,希望喜欢这首歌的人别太抨我。:)
下面是youtube和原歌词。谢谢大家。*_*
Round, like a circle in a spiral
Like a wheel within a wheel.
Never ending or beginning,
On an ever spinning wheel
Like a snowball down a mountain
Or a carnaval balloon
Like a carousell that's turning
Running rings around the moon
Like a clock whose hands are sweeping
Past the minutes on it's face
And the world is like an apple
Whirling silently in space
Like the circles that you find
In the windmills of your mind
Like a tunnel that you... 阅读全帖
s*****t
发帖数: 1994
27
M51: Cosmic Whirlpool
Explanation: Follow the handle of the Big Dipper away from the dipper's bowl, until you
get to the handle's last bright star. Then, just slide your telescope a little south and west and
you'll likely find this stunning pair of interacting galaxies, the 51st entry in Charles
Messier's famous catalog. Perhaps the original spiral nebula, the large galaxy with well
defined spiral structure is also cataloged as NGC 5194. Its spiral arms and dust lanes clearly
sweep in front of i
s*****t
发帖数: 1994
28
Accretion Disk Simulation
Credit: Michael Owen, John Blondin (North Carolina State Univ.)
Explanation: Don't be fooled by the familiar symmetry. The graceful spiral structure seen
in this computer visualization does not portray winding spiral arms in a distant galaxy of
stars. Instead, the graphic shows spiral shock waves in a three dimensional simulation of an
accretion disk -- material swirling onto a compact central object that could represent a white
dwarf star, neutron star, or bla
s*****t
发帖数: 1994
29
来自主题: Astronomy版 - Astronomy Picture of Day: NGC1365
NGC 1365: A Nearby Barred Spiral Galaxy
Credit: FORS Team, 8.2-meter VLT Antu, ESO
Explanation: Many spiral galaxies have bars across their centers. Even our own Milky Way
Galaxy is thought to have a bar, but perhaps not so prominent as the one in NGC 1365, shown
above. The persistence and motion of the bar imply relatively massive spiral arms. The
placements of bright young blue stars and dark dust lanes also indicate a strong rotating
density wave of star formation. NGC 1365 is
s*****t
发帖数: 1994
30
来自主题: Astronomy版 - Astronomy Picture of Day: NGC253
Spiral Galaxy NGC 253 Almost Sideways
Credit & Copyright: Jean-Charles Cuillandre (CFHT), Hawaiian Starlight, CFHT
Explanation: NGC 253 is a normal spiral galaxy seen here almost sideways. It is the largest
member of the Sculptor Group of Galaxies, the nearest group to our own Local Group of
Galaxies. NGC 253, pictured above, appears visually as one of the brightest spirals on the sky,
and is easily visible in southern hemisphere with a good pair of binoculars. The type Sc galaxy
is about 10
w*******y
发帖数: 60932
31
Extra 25% Off GE CFL Light Bulbs:
http://www.amazon.com/gp/feature.html/ref=xs_gb_all-deals_cente
Through March 31st, save an additional 25% off at checkout on select GE CFL
bulbs shipped and sold by Amazon.com (restrictions apply).
I was looking for some good daylight CFLs (6500K color), finally landed here
and was surprised to get additional 25% off. These are excellent white
light, just like tubelights.. not a pinch of yellowness.
Go grab them
Link:
http://www.amazon.com/85397-26-Watt-Energy-... 阅读全帖
s*****t
发帖数: 1994
32
M51: Cosmic Whirlpool
Explanation: Follow the handle of the Big Dipper away from the dipper's bowl, until you
get to the handle's last bright star. Then, just slide your telescope a little south and west and
you'll likely find this stunning pair of interacting galaxies, the 51st entry in Charles
Messier's famous catalog. Perhaps the original spiral nebula, the large galaxy with well
defined spiral structure is also cataloged as NGC 5194. Its spiral arms and dust lanes clearly
sweep in front of i
s*****t
发帖数: 1994
33
Accretion Disk Simulation
Credit: Michael Owen, John Blondin (North Carolina State Univ.)
Explanation: Don't be fooled by the familiar symmetry. The graceful spiral structure seen
in this computer visualization does not portray winding spiral arms in a distant galaxy of
stars. Instead, the graphic shows spiral shock waves in a three dimensional simulation of an
accretion disk -- material swirling onto a compact central object that could represent a white
dwarf star, neutron star, or bla
s*****t
发帖数: 1994
34
来自主题: _Astronomy版 - Astronomy Picture of Day: NGC1365
NGC 1365: A Nearby Barred Spiral Galaxy
Credit: FORS Team, 8.2-meter VLT Antu, ESO
Explanation: Many spiral galaxies have bars across their centers. Even our own Milky Way
Galaxy is thought to have a bar, but perhaps not so prominent as the one in NGC 1365, shown
above. The persistence and motion of the bar imply relatively massive spiral arms. The
placements of bright young blue stars and dark dust lanes also indicate a strong rotating
density wave of star formation. NGC 1365 is
s*****t
发帖数: 1994
35
来自主题: _Astronomy版 - Astronomy Picture of Day: NGC253
Spiral Galaxy NGC 253 Almost Sideways
Credit & Copyright: Jean-Charles Cuillandre (CFHT), Hawaiian Starlight, CFHT
Explanation: NGC 253 is a normal spiral galaxy seen here almost sideways. It is the largest
member of the Sculptor Group of Galaxies, the nearest group to our own Local Group of
Galaxies. NGC 253, pictured above, appears visually as one of the brightest spirals on the sky,
and is easily visible in southern hemisphere with a good pair of binoculars. The type Sc galaxy
is about 10
d********a
发帖数: 3698
36
Researchers at Southeast University in Nanjing, China have created a
device that traps and absorbs electromagnetic waves coming from all
directions, spiraling them inwards without any reflections, essentially
creating an electromagnetic black hole. Qiang Cheng and Tie Jun Cui’s
“omnidirectional electromagnetic absorber” draws in microwaves coming
from any direction by spiraling radiation inwards, and converting its
energy into heat. They plan on developing a device that can absorb
visible light
u****n
发帖数: 7521
37
http://the-diplomat.com/2011/01/21/chinas-rise-remilitarizing-j
China’s Rise = Remilitarizing Japan?
Last year was a bad one for China’s soft power. Will Japan’s response
prompt a dangerous spiral of arms spending—and spark conflict? Read the
article in The Diplomat here:
Saying publicly for the first time what they’ve thought privately for
years, Japanese defence planners in December announced a new defence posture
that fingered China’s military rise as justification for a new, more
proact... 阅读全帖
b********n
发帖数: 38600
38
来自主题: Military版 - 兔子发威了
China warns of dangerous Russia sanctions 'spiral'
http://www.reuters.com/article/2014/03/13/us-ukraine-crisis-chi
(Reuters) - China's top envoy to Germany has warned the West against
punishing Russia with sanctions for its intervention in Ukraine, saying such
measures could lead to a dangerous chain reaction that would be difficult
to control.
In an interview with Reuters days before the European Union is threatening
to impose its first sanctions on Russia since the Cold War, ambassador Shi
Min... 阅读全帖
m********5
发帖数: 17667
39
来自主题: Military版 - 沙特崩溃倒计时了吧
你这个是spin而不是他说的spiral trajectory
这个是by-design弄出来的
增加beam-rider飞弹头部摆动角度,增加引导的鲁棒性,而不是增加稳定性
可以想像一下,如果是普通轨迹。飞行遇到一个微扰,头部偏离收不到信号了,导弹就
打偏了。但如果是以进动的方式进行扫描,则有更大机会接续引导信号。
The missile detects the laser beam and attempts to keep it centered between
two receiving sensors in the tail while flying towards the target. The
missile
has only one servo motor for steering, so it rolls around its longitudinal
axis in flight, continuously correcting pitch and yaw in turn. This rotating
motion gives the missile a distin... 阅读全帖

发帖数: 1
40
数学里的 e 到底有多自然?—— e 的前世今生
e有时被称为自然常数(Natural constant),是一个约等于2.71828182845904523536
……的无理数。
以e为底的对数称为自然对数(Natural logarithm),数学中使用自然(Natural)这
个词的还有自然数(Natural number)。这里的“自然”并不是现代人所习惯的“大自
然”,而是有点儿“天然存在,非人为”的意思。就像我们把食品分为天然食品和加工
食品,天然食品就是未经人为处理的食品。
但这样解读“自然”这个词太浅薄了!为了还原全貌,必须穿越到2500多年前的古希腊
时代。
(你也知道,穿越剧都很长(>﹏<),不喜欢长篇大论的,可直接跳到后面看结论。)
“自然”的发明
我们知道,人类历史上曾出现过很多辉煌的文明,例如大家熟知的四大文明:古巴比伦
、古埃及、古印度河以及古代中国。
但是要说谁对现代文明的影响最大?对不起,四大文明谁都排不上!真正对现代文明影
响最大的是古希腊文明,特别是古希腊的哲学、科学思想,是整个现代文明的源头和基
石。这里并不是要贬低四大文明,现代文明也从各文明继承... 阅读全帖
b********n
发帖数: 38600

发帖数: 1
42
Wealthy Hong Kongers Are "Activating Contingency Plans" As Violence Spirals
Out Of Control
https://www.zerohedge.com/geopolitical/wealthy-hong-kongers-are-activating-
their-contingency-plans-violence-spirals-out
Malaysia is a top destination for a number of reasons. First, Malaysia is
absolutely beautiful, a nation of kind and friendly people with stunning
vistas and perfect weather. Second, they hand out residency (MM2H visas) to
anyone with a few hundred grand in the bank and an income of abou... 阅读全帖
M******n
发帖数: 43051
43
我知道,不是旋转,是spiral,尤其是那个fan spiral,感觉她的腿根本抬不起来
l****z
发帖数: 29846
44
来自主题: USANews版 - ObamaCare's Costs Are Soaring
We already know the rosy budget estimates used to sell the law were wrong.
By RON JOHNSON
One year after the passage of ObamaCare, this paper published an op-ed I
wrote ("ObamaCare and Carey's Heart") about how America's health-care system
saved my daughter's life, and describing how implementing this law will
limit innovation, lead to rationing, and lower the quality of care. Now, two
years out, I would like to focus on the budgetary disaster.
As a candidate, Barack Obama repeatedly claimed tha... 阅读全帖
l****z
发帖数: 29846
45
Fathers disappear from households across America
Big increase in single mothers
By Luke Rosiak
-
The Washington Times
Tuesday, December 25, 2012
Nicole Hawkins' three daughters have matching glittery boots, but none has
the same father. Each has uniquely colored ties in her hair, but none has a
dad present in her life.
As another single mother on Sumner Road decked her row-house stoop with
Christmas lights and a plastic Santa, Ms. Hawkins recalled that her middle
child's father has never spent a... 阅读全帖
l****z
发帖数: 29846
46
Argentina freezes prices to break inflation spiral
Posted: Feb 04, 2013 11:51 AM Updated: Feb 04, 2013 11:51 AM
ALMUDENA CALATRAVA, Associated Press
BUENOS AIRES, Argentina (AP) — Argentina announced a two-month price freeze
on supermarket products Monday in an effort to break spiraling inflation.
The price freeze applies to every product in all of the nation's largest
supermarkets — a group including Walmart, Carrefour, Coto, Jumbo, Disco and
other large chains. The companies' trade group, repr... 阅读全帖
S**C
发帖数: 2964
47
Before I get into some of your detail arguments, I want to firstly say any
tax regime change, spending level etc, especially something fundamental, if
done in a short period of time, will rock the system, as you said a death
spiral. But there is something called "gliding path" or "phase in".
Essentially, cap fed tax revenue to 20% GDP, slowly increase tax on asset,
and decrease tax on income. How long it takes? For reference, S-B's proposal
on SS reform will take about 60 years.
Then some detail... 阅读全帖
l****z
发帖数: 29846
48
来自主题: USANews版 - 巴马care离死不远了
ObamaCare is entering its dreaded ‘death spiral’
By Betsy McCaughey
October 19, 2015 | 7:46pm
ObamaCare is heading toward a death spiral.
The Obama administration is having trouble selling insurance plans to
healthy people. That’s a big problem: When the young and healthy don’t
enroll, premiums have to be hiked to cover the costs of older, sicker people
, discouraging even more young people from signing up.
Last Thursday, the administration predicted enrollment for 2016 will be less
than half wh... 阅读全帖
b*****d
发帖数: 61690
49
Aetna CEO: Obamacare markets are in a 'death spiral'
By PAUL DEMKO 02/15/17 09:54 AM EST Updated 02/15/17 01:26 PM EST
Obamacare is in a “death spiral,” the influential CEO of Aetna, Mark
Bertolini, declared Wednesday morning.
Bertolini’s doomsday prophesy: More insurers will pull out of the
government-run marketplaces in the coming weeks and many areas will have no
insurers to provide Affordable Care Act coverage in 2018.
“It’s not going to get any better; it’s getting worse,” Bertolini said
in... 阅读全帖
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