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全部话题 - 话题: infinitely
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p***e
发帖数: 139
1
来自主题: EnglishChat版 - how to express this meaning?
I throw a dice, this dice has / contains /displays six values from 1 to 6.
I throw another dice, this dice has/ contains / displays infinite values fro
m 0 to infinity, that is, it has infinitely many facets.
m**d
发帖数: 21441
2
【 以下文字转载自 Military 讨论区 】
发信人: wayofflying (小破熊), 信区: Military
标 题: 人类第一台真空能发动机即将在中国攻关成功
发信站: BBS 未名空间站 (Sat May 14 22:28:25 2011, 美东)
高歌,现任北京航空航天大学能源动力学院动力工程及工程热物理学科一级责任教授,
航空发动机气动热力国防重点实验室副主任,长期从事动力工程、工程热物理及流体力
学领域的教学与科研工作,并在基础科研和多学科的应用技术领域取得了一系列国际领
先水平的创新性科研成果。
他在1984年发明的"沙丘驻涡火焰稳定器",获国家发明一等奖,钱学森同志称之为"一
项长中国人志气的重要发明"。该成果广泛应用于我国多种军用航空发动机中,取得了
数以亿元计的经济效益,至今仍保有先进水平。本刊记者于今年10月采访了高歌教授,
了解到了他近期从事的一些前沿科研工作的最新进展,尤其是他对龙卷风的研究及其工
程应用价值,让人耳目一新。
高歌教授在采访中提到,传统的航空发动机技术虽然还在不停地改进提高之中,但
受到原理和材料工艺上的限制,已经逐渐逼近了性能发... 阅读全帖
n*s
发帖数: 752
3
来自主题: Joke版 - 电面的一个问题 (转载)
if infinitely fast, it's like pushing on rock since water does not have
enough time to reshape itself.
if infinitely slow, the boat should almost stay rest since water has enough
time to redistribute
c**d
发帖数: 3888
4
来自主题: Joke版 - Japanese women vs Chinese women
14 Differences Between Japanese Women & Chinese Women
1.
Japanese women often teach their children to bravely fight the forces of
evil, and even if they lose, it is still infinitely glorious, the highest
honor.
Chinese women often teach their children that when they encounter the forces
of evil they must be good at hiding/running away/avoiding. They say that
God will punish them [the forces of evil].
2.
Japanese women believe Japan is the world’s greatest country.
Chinese women usually believe t... 阅读全帖
h*********i
发帖数: 2605
5
【 以下文字转载自 JobHunting 讨论区 】
发信人: gqiceeyes (iceeyes), 信区: JobHunting
标 题: 今天电面又被老印黑了。。。。
发信站: BBS 未名空间站 (Tue Jun 4 19:46:47 2013, 美东)
问我what is the worst sorting algorithm
我说n^2还不够那我想个n^3的,
他说even worse,
我想了一会他说if you randomly swap two positions every time, you may end up
infinite time ......
我无语了。。。想要infinite time我直接给你个while(1)好不好?
第二天果然悲剧
w*********a
发帖数: 9279
6
Infinite looping is valid, but infinite recursion overflows the stack, which
is not allowed.
R***s
发帖数: 302
7
It's starting to look like a joke now if you examine the 15 patterns on post
72 more carefully.
1) Number 1(blue) & 6(light purple?): they all look like a division of the
same hexagon. And you can get infinite number of shapes if you tilt the
division line back and forth.
2) Number 3(red): it's a division of another hexagon with all 6 edges being
the same length. Again, if you rotate the center 3-legged division lines,
you again get infinite number of shapes.
3) Number 11, 12, 14 and to some ext... 阅读全帖
H****y
发帖数: 2992
8
来自主题: Joke版 - Break Free
Break Free
---A Short Fiction, by Fiona Rawsontile, Aug 25 2016

Chapter One: Joke
“Chang2010, USANews. Yuhua27, Joke …” A man’s mechanical voice, just as
usual.
“No!” Yuhua27 shouted. “Not Joke! Not again!” Her body was shaking, or,
more accurately, her imagined figure as a twenty-seven-year-old woman was
shaking.
The noise surrounding her suddenly disappeared, and she knew she might have
made the biggest mistake in the past sev... 阅读全帖
H********g
发帖数: 43926
9
来自主题: Joke版 - 这个不错
好在还有个免费下载的zip
Pricing and Availability
“Designed by Apple in California” — Small

Starts at $199 (US) in small (10.20” x 12.75”)

Available beginning tomorrow, Wednesday, November 16, exclusively from Apple
.com in Australia, France, Germany, Hong Kong, Japan, Korea, Taiwan, the UK
and the US, and select Apple Stores.1
Available at the following US retail locations: Apple SoHo, Apple Fifth
Avenue, Apple Upper East Side, Apple Williamsburg and Apple World Trade
Center in New York; App... 阅读全帖
w*********2
发帖数: 227
10
来自主题: Memory版 - 楼兰新娘

***
好嘛 我又不正经了 来段正经的:
爱情太短,遗忘太长 — 聂鲁达
I can write the saddest poem of all tonight.
Write, for instance: "The night is full of stars,
and the stars, blue, shiver in the distance."
The night wind whirls in the sky and sings.
I can write the saddest poem of all tonight. 。
I loved her, and sometimes she loved me too.
On nights like this,
I held her in my arms.
I kissed her so many times under the infinite sky.
She loved me, sometimes I loved her.
How could I not have loved her large, still eyes?... 阅读全帖
K*******l
发帖数: 3747
11
【 以下文字转载自 Food 讨论区 】
发信人: ditu (地图·潜水员深海), 信区: Food
标 题: 贴一个锅具使用报告(图文)
关键字: '锅 使用报告'
发信站: BBS 未名空间站 (Sat Sep 5 21:28:36 2009, 美东)
经常看到有人问买什么锅比较好,俺来贴一个锅具使用报告供大伙儿参考。两年前我推荐过另外一个平底不粘锅(Calphalon Commercial Nonstick 10-Inch International Griddle),今天说的这套Circulon Infinite锅比以前推荐的更好用呢。
Circulon Infinite Twin Pack 10-Inch & 12-Inch Open Skillets
【优点】:
1. 材质:这套锅的锅底是不锈钢的,锅身是hard anodized aluminum材质,在手上掂
量一下就知道很有份量。煤气灶、电灶都可以用。
2. 锅底平坦。摊鸡蛋饼,摊出来的厚度很均匀。
3. 试验过多种食材,实践证明,锅身一点儿都不沾。
4. 那个12寸的锅子,可以当作炒锅用。它的锅身比一般的ope
r*****g
发帖数: 123
12
说浪漫主义是“宣泄情感”,是对浪漫主义的贬低。用一句套话,你这样说,
不是不得要领,就是别有用心。或者象 Tolstoy 说的,不是傻瓜,就是坏蛋。
从十八世纪末到二十世纪初被称为浪漫时期,是一种无奈的说法。对于当时
社会情景的变化和人们对生活与艺术的“新观念”,我们找不到恰当的表述。
浪漫主义的内容远比“宣泄情感”广泛,其残渣余孽至今都还留在我们的头脑
中。比如有的人动不动就要“返回大自然”,这都是浪漫时期的口号。
谁都无法给浪漫主义下个铁板钉钉的定义。我们只能退而求其次,采用
修辞手法(rhetoric)来描述浪漫主义的特征,说它是一种excess,或者说它是
infinite longing。Baudelaire 的一个说法算是最不坏的了 ---
“To say the word Romanticism is to say moderm art - that is,
intimacy, spirituality, colour, aspiration towards the infinite,
expressed by every means available to the a
l*****u
发帖数: 199
13
来自主题: Belief版 - Re: 没人谈谈共产主义吗?

Can somebody like Adulf Hitler be satisfied by finite productivities
on a finite world?
They wanna others be all slaves of him.
Actually, infinite products are not really infinite.
It means to physically separate individuals incontactable.
A ref. is solaria in Issac Asimov's Sci.Fi.
But it is another bad imagination.
Ok. Let's stop here. I really do not have time to publish
such a big theory. It is hard to explain by simple words on bbs.
Sorry but I cannot help.
l*****u
发帖数: 199
14
来自主题: Belief版 - Re: 没人谈谈共产主义吗?

Can somebody like Adulf Hitler be satisfied by finite productivities
on a finite world?
They wanna others be all slaves of him.
Actually, infinite products are not really infinite.
It means to physically separate individuals incontactable.
A ref. is solaria in Issac Asimov's Sci.Fi.
But it is another bad imagination.
Ok. Let's stop here. I really do not have time to publish
such a big theory. It is hard to explain by simple words on bbs.
Sorry but I cannot help.
l*****a
发帖数: 38403
15
Point out that science is a wonderful thing, but discuss "natural" processes
like the ones called entropy (definition: disorder in a system, which
resolves to equilibrium--like dust settles) and chaos (definition: inherent
unpredictability) are not thought of as building anything:
The second law of thermodynamics states that the entropy (or disorder) of
the entire universe (a system comprising of ALL matter) must increase with
time. If the universe had always existed, then entropy of the entire
... 阅读全帖
z****u
发帖数: 3461
16
http://acg.178.com/201309/173410660892.html
178特别盘点·国内网站购买版权与直播的10月新番动画
扒要素: 原创文章 / 动画情报 /
2013-09-17 17:37:40 来源:178动漫频道
OK,惯例又是盘点国内视频网站购买10月新番动画网络播出版权的时段了!不过目
前还不是最终版,有些不保证完全正确,敬请期待10月初的完整版!小编也会继续努力
“贿赂”国内各个视频站编辑,为大家确认最后的10月新番播出版权!
本次需要说的是大人气动画第2季「黑子的篮球」似乎被各个网站都买下了版权,
因此在各个视频网上都能看到。而依然大手的乐视网买下了「双斩少女(kill la kill
)」、「魔笛Magi第二季」、「武士弗拉明戈」、「伽利略少女 」、「我的脑内恋碍
选项」、「没能成为勇者的我无可奈何决定去工作」 、「少女骑士物语」,除此之外
还会有更多哦!
爱奇艺和土豆优酷子目前还未确定,不过很快就会有情报流出,敬请期待!除此之
外,加入版权购买大军的腾讯视频也开始了新一轮的挑战,宅腐兼修的收下了「金色时
光」和「恶魔恋人Diabolik Lov... 阅读全帖
a***k
发帖数: 1038
17
来自主题: paladin版 - 红死病 by 杰克.伦敦
I
The way led along upon what had once been the embankment of a railroad. But
no train had run upon it for many years. The forest on either side swelled
up the slopes of the embankment and crested across it in a green wave of
trees and bushes. The trail was as narrow as a man's body, and was no more
than a wild-animal runway.
Occasionally, a piece of rusty iron, showing through the forest-mold,
advertised that the rail and the ties still remained. In one place, a ten-
inch tree, bursting through... 阅读全帖
c****t
发帖数: 19049
18
来自主题: SciFiction版 - 乱谈Multi-Verse
正式听到Multiverse这个词还是在电视剧Big Bang Theory中,当然类似的东东很久很
久以前就看过了。
记得以前翻过一本叫Quantum Reality的东东,好像类似Multiverse的东东是某个大牛
研究生提出来从哲学上/概念上解释量子物理的。不过当大牛的提法被快餐化之后就变
成了平行宇宙这个科幻文学中老少咸宜,喜闻乐见的东东。 大概上个世纪60末至80年
代,平行世界的主题/设定简直是泛滥成灾,一如当今网文中的“穿越”。
Comic Book 业界的两大巨头也没能免俗。于是不论是Marvel Universe还是DC
Universe,多个现实的故事一度是一统天下的。可惜平行世界这个东东虽然对短文直至
单册长篇来说是不错的题材,对于Comic Book这种本来就多主角,多线头的架构来说就
有如Hurricane一样的灾难。故事和人物都迅速走向不可控制。 DC Comics 最有名的平
行世界系列叫infinite earth crisis。 后人取笑说这crisis就是来自有infinite那么
多的earth。 而这两家出版社的解决方案也是一样的,最后平行世界... 阅读全帖
C***r
发帖数: 759
19
来自主题: Thoughts版 - 11: 5-10
CHAP. 5.--THAT WE OUGHT NOT TO SEEK TO COMPREHEND THE
INFINITE AGES OF TIME BEFORE THE WORLD, NOR THE
INFINITE REALMS OF SPACE.
Next, we must see what reply can be made to those who agree
that God is the Creator of the world, but have difficulties
about the time of its creation, and what
reply, also, they can make to difficulties we might raise
about the place of its creation. For, as they demand why the
world was created then and no sooner, we may
ask why it was created just here where it is, a
j*****7
发帖数: 10575
20
来自主题: TrustInJesus版 - [基督教预定论-RDP] 3 神有一个计划
http://www.ccel.org/ccel/boettner/predest.iii.ii.html
Chapter III
God Has a Plan
It is unthinkable that a God of infinite wisdom and power would create a
world without a definite plan for that world. And because God is thus
infinite His plan must extend to every detail of the world's existence. If
we could see the world in all its relations, past, present, and future, we
would see that it is following a predetermined course with exact precision.
Among created things we may search where we will, ... 阅读全帖
j*****7
发帖数: 10575
21
来自主题: TrustInJesus版 - [基督教预定论-RDP] 4 神的至高主权
http://www.ccel.org/ccel/boettner/predest.iii.iii.html
Chapter IV
The Sovereignty of God
Every thinking person readily sees that some sovereignty rules his life. He
was not asked whether or not he would have existence; nor when, where, or
what he would be born; whether in the twentieth century or before the flood;
whether white or Negro; whether in America or in China. It has been
recognized by Christians in all ages that God is the Creator and Ruler of
the universe, and that as the Creator and ... 阅读全帖
G*M
发帖数: 6042
22
来自主题: TrustInJesus版 - The Deliverance of Man
Bible Course - Christian Doctrine
Lesson 3
The Deliverance of Man
Lord's Day 5-7
The Deliverance of Man
Lord's Days 5 through 31 form the second part of the catechism. It consists
of questions 12 through 85, dealing with the deliverance from sin and misery
. From this aspect the first question is: Is there no way…?
Lord's Day 5
Q. 12. Since then, by the righteous judgment of God, we deserve temporal and
eternal punishment, is there no way by which we may escape that punishment,
and be again rece... 阅读全帖
C****i
发帖数: 1776
23
CHAPTER 2
OF GOD, AND OF THE HOLY TRINITY
1. There is but one only, living, and true God, who is infinite in being and
perfection, a most pure spirit, invisible, without body, parts, or passions
; immutable, immense, eternal, incomprehensible, almighty, most wise, most h
oly, most free, most absolute; working all things according to the counsel o
f his own immutable and most righteous will, for his own glory; most loving,
gracious, merciful, long-suffering, abundant in goodness and truth, forgiv... 阅读全帖
C****i
发帖数: 1776
24
CHAPTER II
Of God, and of the Holy Trinity
I. There is but one only,[25] living, and true God,[26] who is infinite in b
eing and perfection,[27] a most pure spirit,[28] invisible,[29] without body
, parts,[30] or passions;[31] immutable,[32] immense,[33] eternal,[34] incom
prehensible,[35] almighty,[36] most wise,[37] most holy,[38] most free,[39]
most absolute;[40] working all things according to the counsel of his own im
mutable and most righteous will,[41] for his own glory;[42] most loving,[... 阅读全帖
R*o
发帖数: 3781
25
Here we confront a major problem with Calvinism: its denial of God's infinit
e love for all. That God would choose to save only a select few and leave th
e rest to suffer eternal damnation would be contrary to His very nature of i
nfinite love and mercy as the Bible presents Him, and as shall be documented
in the process of examining Calvinism from Scripture.
Incredibly, however, the very damnation of perhaps billions is said by the C
alvinist to have been foreordained from eternity past because... 阅读全帖
R*o
发帖数: 3781
26
by Dave Hunt
A Question Not Of Sovereignty But Of Character
This is not to deny that God has the right to damn us all. However, it is no
t true that His justice requires Him to damn the non-elect any more than the
elect. Nor is it rational that God, who is infinite in love and mercy, woul
d allow anyone to be damned whom He could justly deliver.
Many scriptures clearly declare that God sent His Son "to be the Saviour of
the world" (John 4:42; 1 John 4:14) and that Christ on the cross paid the pe... 阅读全帖
R*o
发帖数: 3781
27
来自主题: TrustInJesus版 - What Love is This?(93)预知不需要先预定
by Dave Hunt
Hear It From Calvin And Calvinists
In his classic, the five points of calvinism, Edwin H. Palmer writes, "Altho
ugh sin and unbelief are contrary to what God commands (His perceptive will)
, God has included them in His sovereign decree (ordained them, caused them
to certainly come to pass) .... How is it that a holy God, who hates sin, no
t only passively permits sin but also certainly and efficaciously decrees th
at sin shall be? Our infinite God presents us with some astounding t... 阅读全帖
j*******7
发帖数: 6300
28
来自主题: TrustInJesus版 - Does Mormon 尼腓二書 support Trinity?
http://wri.leaderu.com/orgs/probe/docs/mormon-god.html
Some noticable passages:
Christianity has taught monotheism from its foundation, the belief in the
existence of one God. Mormonism believes in the existence of a plurality of
gods. According to Mormonism, there are an infinite number of planets like
earth in the universe, each with their god or gods who were once men who
have evolved into godhood. Mormon theologian and Apostle Bruce McConkie
states, "[A] plurality of gods exist . . . there i... 阅读全帖
Y**L
发帖数: 385
29
不错啊,两位果然明白人,觉着地球上的生命有被创造的可能。
那以后碰到有人讲没有创造的可能时,两位就不能揣着明白装糊涂了吧
关于创造者是怎么来的,老E不是比俺更清楚吗,infinite regression,41楼。
Infinite 有点夸张,可能finite更对。 就是说创造者也可能是被他的创造者创造出来
,直到最初的创造者还是需要自然的起源。
我想,稍微有点逻辑能力,我们都能看到这是一个长链,除了第一个需要自然起源,其
余的是被创造出来。
链上只有两种起源,自然进化和创造
只有当我们是链上第一个,我们是进化出来的,将来我们是下一环的创造者
此后的任何一环,我们都是被创造出来,将来我们也是下一环的创造者
我们到底是第一环还是后面的环
这是人类目下的问题
只有当地球生命大致可以确认是创造而来,才有研究创造者的问题
没深入区分进化和创造两种图景,就要去研究创造者,未免逻辑不通,因为可能不存在
创造者
而因为暂时不了解创造者,便想当然否定创造的可能,更是谬误
所以,人类科学当前的任务还是:进化 vs. 创造
至于老E所担心的承认创造可能后生物学研究什么,以及人可能因此变笨的问题
很简单,今... 阅读全帖
j*******7
发帖数: 6300
30
来自主题: TrustInJesus版 - Why Is the Trinity Essential?
http://coldcasechristianity.com/2015/why-is-the-trinity-an-esse
Why Is the Trinity An Essential Christian Doctrine?
I recently received an email question from a listener who
wrote: “I have studied quite a few different translations of the bible and
have full faith in what it says. I also believe that Jesus is my savior, and
do my best to live by what He taught. However, I am not a Christian
according to many religious leaders, because I do not believe in the
doctrine regarding the trinity. I hav... 阅读全帖
j*******7
发帖数: 6300
31
来自主题: TrustInJesus版 - What is God's relationship to time?
We live in a physical world with its four known space-time dimensions of
length, width, height (or depth) and time. However, God dwells in a
different dimension—the spirit realm—beyond the perception of our physical
senses. It’s not that God isn’t real; it’s a matter of His not being
limited by the physical laws and dimensions that govern our world (Isaiah 57
:15). Knowing that “God is spirit” (John 4:24), what is His relationship
to time?
In Psalm 90:4, Moses used a simple yet profound analogy ... 阅读全帖
W**N
发帖数: 1037
32
《无门关》公案 8 奚仲造車
月庵和尚。問僧。奚仲造車一百輻。拈却兩頭。去却軸。明甚麼邊事
無門曰。若也直下明得。眼似流星。機如掣電
頌曰
機輪轉處  達者猶迷  四維上下 南北東西
(链接同上 Page 4).
----
In this case, our essential nature comes on stage in the guise of a cart[车
]. Every koan [公案] deals with our essential nature, and you must never
be bewildered by the garb or trappings it appears in. Here the cart is
another name for our essential nature, and Gettan [月庵和尚,临济宗] is
trying to make us realize it through this medium. He is asking us to apply
the question to our own problem... 阅读全帖
W**N
发帖数: 1037
33
《无门关》公案 8 奚仲造車
月庵和尚。問僧。奚仲造車一百輻。拈却兩頭。去却軸。明甚麼邊事
無門曰。若也直下明得。眼似流星。機如掣電
頌曰
機輪轉處  達者猶迷  四維上下 南北東西
(链接同上 Page 4).
----
In this case, our essential nature comes on stage in the guise of a cart[车
]. Every koan [公案] deals with our essential nature, and you must never
be bewildered by the garb or trappings it appears in. Here the cart is
another name for our essential nature, and Gettan [月庵和尚,临济宗] is
trying to make us realize it through this medium. He is asking us to apply
the question to our own problem... 阅读全帖

发帖数: 1
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《中部》经1至经4。包括《一切漏经》。第一 根本五十经篇
第一 根本品
MN.1.1-10
MN.1.1 根本法门(The Root of All Things)经
1.1.1 如是我闻。有一次,世尊住在郁伽罗(Ukkattha)幸福林(Subhaga Grove)的一棵
王家沙罗树(sala)下。 在那里,世尊对比丘们说道:“比丘们!” “尊师!”那些比
丘回答道。世尊如是说道:
1.1.2 “比丘们!我将教导你们根本法门的论述。你们要仔细聆听和注意思惟我要说
的话。” “是的,大德!”比丘们回答道。世尊说道:
1.1.3 “比丘们!这里,一个未受教导的凡夫,他不重视圣者们,对他们的法不熟练
和未经受训练;他不重视善人们,对他们的法不熟练和未经受训练,他认知(perceives
)地为地。他已经认知地为地之后,他设想(conceives)他自己是地,设想他自己在地当
中,设想他自己与地分离,设想地是“我的”,他因地而欢喜。那是什么原因呢?我说
,因为他没有完全了知它。
1.1.4 他认知水为水。认知水为水之后,他设想他自己是水,设想他自己在水当中,
设想他自己与水分离,设想... 阅读全帖
C********g
发帖数: 9656
35
【 以下文字转载自 Military 讨论区 】
发信人: wayofflying (小破熊), 信区: Military
标 题: 人类第一台真空能发动机即将在中国攻关成功
发信站: BBS 未名空间站 (Sat May 14 22:28:25 2011, 美东)
高歌,现任北京航空航天大学能源动力学院动力工程及工程热物理学科一级责任教授,
航空发动机气动热力国防重点实验室副主任,长期从事动力工程、工程热物理及流体力
学领域的教学与科研工作,并在基础科研和多学科的应用技术领域取得了一系列国际领
先水平的创新性科研成果。
他在1984年发明的"沙丘驻涡火焰稳定器",获国家发明一等奖,钱学森同志称之为"一
项长中国人志气的重要发明"。该成果广泛应用于我国多种军用航空发动机中,取得了
数以亿元计的经济效益,至今仍保有先进水平。本刊记者于今年10月采访了高歌教授,
了解到了他近期从事的一些前沿科研工作的最新进展,尤其是他对龙卷风的研究及其工
程应用价值,让人耳目一新。
高歌教授在采访中提到,传统的航空发动机技术虽然还在不停地改进提高之中,但
受到原理和材料工艺上的限制,已经逐渐逼近了性能发... 阅读全帖
s**r
发帖数: 255
36
来自主题: BUPT版 - 考考大家
1) I do not agree with soliton.
I do not agree with your 1/0 infinite point. A filter's transfer function
can have zeros and poles. At the poles, the transfer function goes to
infinite, that's reasonalbe. When you take inverse of the transfer
function, zeros become poles, poles become zeros. You got another
filter's transfer function, no problem.
2) I do not agree with JVC either
Even if the low pass filter has the component of e^(-wt0), I can take
out this component before I do inverse. So afte
d**o
发帖数: 79
37
来自主题: DUT版 - 求校友帮忙下几篇文献
1.G. F. Homicz and J. A. Lordi, ''A note on the radiative directivity
patterns
of duct acoustic modes,'' Journal of Sound and Vibration. 41, 283-290 1975
2.Y. ANDO. On the sound radiation from semi-infinite circular pipe of
certain wall thickness. Acustica, 1969. 22: p. 219-225.
3.M. Bernard and B. Denardo. Re-computation of ando's approximation of the
end correction for a radiating semi-infinite circular pipe. Acustica, 1996.
82(4): p. 670-671.
非常感谢! 我邮箱:d****[email protected]
i****g
发帖数: 3896
38
http://pkunews.pku.edu.cn/xwzh/2013-05/15/content_272348.htm
数学科学学院校友张益唐在孪生素数研究方面取得重大突破
日期: 2013-05-15 信息来源: 数学科学学院
日前,Nature官网发布新闻:“无穷多素数成对存在的首次证明(First proof that
infinitely many prime numbers come in pairs)”,文章报道了北大数学科学学院
78级校友张益唐在孪生素数研究方面所取得的突破性进展,他证明了孪生素数猜想的一
个弱化形式。
众所周知,素数是指正因数只有1和本身的正整数。素数在整数里面是非常稀疏的。如
果我们将素数从小到大排一个次序,那么从概率上说,随着素数的增大,下一个素数离
上一个素数应该越来越远,而孪生素数猜想是说存在无穷多对素数,他们只相差2。例
如3和5,5和7,……,2,003,663,613 × 2^195,000- 1 和 2,003,663,613 × 2^195,
000+1等等。这两个素数挨的如此之近,就像宇宙里面地球遇见了太阳一样神奇,因此
我们称... 阅读全帖
a***a
发帖数: 40617
39
来自主题: Apple版 - ipad1 vs ipad2 reallife test video
总结自youtube
RAM performance (mostly web browsing)
apps
HD games (enhanced for ipad2)
基本上我总结一下
浏览网页,ipad2大概快10%~20%取决于网页复杂程度,但是也就是快个
几秒的问题。然后在多页面选取中,因为ram大了,很多驻留在内存,不需要
reload,ipad1有些需要reload
app应用,快的速度可以忽略,几乎一样
HD游戏性能(都是用专门为ipad2 enhance过的游戏测试的),ipad2读取
速度明显快。但是游戏流畅性(所谓“用户体验?”)差不多。而这个测试
验证了以前的猜测,下面专门说明一下
显卡性能的确提高了5~9倍,但是是否需要这么高?我们知道,只有几个东西
需要显卡性能的大幅提高。一个是分辨率(1和2一样),二是抗锯齿(同分辨率
下,不开抗锯齿和开x16抗锯齿对运算要求差别非常大),三是各种粒子光影效果
实时渲染。
在分辨率无法继续增加的情况下(我已经体验了infinite blade,作为一个
heavy PC FPS/action game player,我感觉一下... 阅读全帖
s***l
发帖数: 9
40
来自主题: Database版 - database triggers
CREATE TRIGGER tt_trigger AFTER INSERT OR UPDATE OF
unix_date
ON tt_test
FOR EACH ROW
BEGIN
update tt_test set oracle_date =
unix_to_ora(:new.unix_date);
END;
Maybe (update tt_test set oracle_date =
unix_to_ora(:new.unix_date);) is enough.
See if this works. The original trigger will cause infinite
trigger events in theory, so maybe that is why it cause
error.
This one will not cause infinite trigger events.
And also, BEFORE is surely not what you want. The PL/SQL
statements

发帖数: 1
41
来自主题: Hardware版 - Silicon Carbide: Smaller, Faster, Tougher
What Happened To GaN And SiC?
Early predictions were overly optimistic, but these technologies are
starting to make inroads.
About five years ago, some chipmakers claimed that traditional silicon-based
power MOSFETs had hit the wall, prompting the need for a new power
transistor technology.
At the time, some thought that two wide-bandgap technologies—gallium
nitride (GaN) on silicon and silicon carbide (SiC) MOSFETs—would displace
the ubiquitous power MOSFET. In addition, GaN and SiC were suppos... 阅读全帖
x****u
发帖数: 44466
42
【 以下文字转载自 Joke 讨论区 】
发信人: huchihaisai (hu), 信区: Joke
标 题: 今天电面又被老印黑了。。。。 (转载)
发信站: BBS 未名空间站 (Thu Jun 6 01:54:30 2013, 美东)
发信人: gqiceeyes (iceeyes), 信区: JobHunting
标 题: 今天电面又被老印黑了。。。。
发信站: BBS 未名空间站 (Tue Jun 4 19:46:47 2013, 美东)
问我what is the worst sorting algorithm
我说n^2还不够那我想个n^3的,
他说even worse,
我想了一会他说if you randomly swap two positions every time, you may end up
infinite time ......
我无语了。。。想要infinite time我直接给你个while(1)好不好?
第二天果然悲剧
r******a
发帖数: 1
43
【 以下文字转载自 EE 讨论区,原文如下 】
发信人: Romonada (大可不必), 信区: EE
标 题: matlab 的菜菜菜菜鸟问题,大侠救命
发信站: Unknown Space - 未名空间 (Sun Sep 28 18:24:22 2003) WWW-POST
巨简单的MATLAB
小弟实在第一次用MATLAB
题目要求先用RAND生成1000个随机数字(x)
要求模拟laplacian distribution
f(x) = (-1/2) exp(-|x|)
然后要求画出来sample的cdf, pdf图
欧的m file:
clear all
format long E
infinite = input (['Give me a positive number you assume to be close enough to
infinity\n']);
for i = 1:1000
r(i)=rand;
x(i) = infinite * 2 * (r(i) - 0.5);
end
sort(x)
for i = 1:1000
f(i
j*****0
发帖数: 20
44
本人刚考过MFE,现低价转让帮助我一次通过考试的所有学习材料,包括:
最新Spring2012版的The Infinite Actuary和ActuarialBrew的完整套餐,以及朋友送
的第7版的九成新ASM Study Manual(内容和第9版相比基本没变)。
Actuarial Bookstore上总价值超过$1300,现在超低价$200转让, 具体列表及原价格可
见最下边。
注意事项:
1.TIA以及ActuarilBrew的材料都是全新打印件(绝非电子版本);ASM是官方打印的原
书,上面只有第一,二章有少量笔记,其余全新。
2.TIA以及ActuarilBrew的网上课程不包括在内,但是所有网上课程的讲义及笔记都会
包括。换句话说,除了没有人给你讲课,其余和购买全新的Seminar套餐无异。
3.所有材料都是活页孔纸,方便自由装订。
4.TIA+AB+ASM是一次通过MFE的不二法宝,完美组合。切身体会!
推荐复习方式:TIA Lecture Slides--->TIA Practice Problems--->AB Review Notes
& Practice Pr... 阅读全帖
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