x*o
发帖数: 1037 | 1 来自主题: Macromolecules版 - 牛人
After watching Spider-man, I always thought about being bited by a spider :) |
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y****u
发帖数: 50 | 2 as we can't rea the full article on the web, I'd like to post several
interesting lines:
****************************************************
..."Instead of making a fiber, spinning it into yarn, weaving it into fabric,
cutting and sewing it into clothes, you'd go from fiber to garment with none
of the steps in between." she said.
Of course, when you think about it, that kind of system has been in operation
for eons. A spider goes directly from polymer fiber (spider silk) to
application (a web). |
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r*****t
发帖数: 286 | 3 ☆─────────────────────────────────────☆
lhict (至少还有我) 于 (Sat Apr 28 20:22:06 2007) 提到:
A spider eats three flies a day. Until he fills his quota, he has a 50%
chance of catching any fly that attempts to pass his web. What are a fly's
chances of survival, given that five flies have already made the attempt
today?
我的答案是3/4.不知对不对？
☆─────────────────────────────────────☆
BulletTooth (DesertEagle.50) 于 (Sat Apr 28 20:41:37 2007) 提到:
条件概率啊。
F: flies already eaten by spider today
P(F=3) * 1 + |
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d***u
发帖数: 19 | 4 1. You roll an n sided die. If the result is 1, you may re-roll or take
the result. Otherwise (i.e., the result is 2,3,...,n), you can only take
the result. On the re-roll, you may re-roll if the result is a 2 or less,
then a 3 or less, ect. On the nth re-roll, you may re-roll if the result
is n or less (any result). Each re-roll is optional. What is the maximum
expected value of this game?
2. A spider starts at one corner of a cube. Each second, he randomly
chooses one of the edges he is adjace... 阅读全帖 |
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d***u
发帖数: 19 | 5 可恶的是，2 还有一个扩展版，
Let the spider be in a corner of a regular polyhedron with n sides. What
is the expected number of seconds until the spider has visited every
corner.
。。。。。。
这几天就为了这几道题，吃不好，睡不好。。。
the
simply
work |
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r**i
发帖数: 2328 | 6 The program on Discovery Channel is about how intelligent animals perform ta
sks after proper training.
Some traditional methods are mentioned such as Thais trained monkeys to pick
up coconuts; Chinese trained cormorants for fishing.
Modern experiments and events show animals are smarter than we human beings
imagine.
Horses, pigs, bugs, spiders, pigeons, fish, swans exhibt certain intelligenc
e as hunting for food.
In an experiment conducted by an Australian researcher, a spider can even do
plan |
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i*****s
发帖数: 15215 | 7 赞！这最后一段有启发，我们都只看到自己想看的，真相即使明摆着，也可能视而不见。
After the spiders were found in the Oregon cave, scientists from San Diego
State University went looking in the redwoods of Northern California, and
found a spider in the same family, but a new species, living in underground
cavities beneath boulders and logs, Griswold said. |
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I***i
发帖数: 14557 | 8 Myth Buster里Adam主动让cellar spider咬的视频
spider）
most
too
repeated
but |
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f*******e
发帖数: 8974 | 9 我对比了08-30和09-09的图，卵袋外层的卵已经瘪了，中间的褐色圆心也没了。
不会是珠妈饿了吧。。。两次蚂蚁都没吃到，又ooxx，这个，这个，不敢想象啊。
猜测总是不准确的，期待后续报道
Female cellar spiders form their eggs into a ball. They hold the ball in
their jaws for several weeks while the eggs develop, and when they new
spiders hatch, they ride on their mother for several days before dispersing.
long way to go! |
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I***i
发帖数: 14557 | 10 看吧，多了就得人为干预了。现在小蜘蛛在蛛妈网上我不会打扰，但以后在别的地方看
见小蜘蛛我可能会把它们请出去，让它们到外面抓虫子。
话说今天在外面拍到了几个很大个的cellar spider。那个网上挂着好几个卵袋的
common house spider也被我看到有公蜘蛛前来求爱了。 |
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I***i
发帖数: 14557 | 11 这个common house spider (Parasteatoda tepidariorum)和黑寡妇是近亲，长得像，
公母大小的悬殊也差不多。但cellar spider公母就差不多。 |
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a***a
发帖数: 12425 | 13 我才刚想起来，Daddy Long-Leg Spider == Cellar Spider? |
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I***i
发帖数: 14557 | 14 蛛妈#825已经是成年的了，但是没有马盈盈#915大。这种蜘蛛的腿很长。比如说马盈盈
#915，真要是把腿伸直从前脚到后脚尖会很长的，能有7-8厘米了吧，反正5-6厘米肯定
不止。
那些cellar spider刚离家时伸开腿脚的覆盖范围就和食指肚差不多大了。
common house spider腿短肚圆。#917小一点，产前的肚子要比黄豆大一圈，产后要比
黄豆小。另外两个要大些，现在比产前的透明腿还大一圈。 |
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I***i
发帖数: 14557 | 17 查过网，未果，不知道是啥种类。
看形状有点像huntsman spider，只是huntsman spider很大。 |
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I***i
发帖数: 14557 | 18 昨天（11/08）早上看见这个蜘蛛，就在以前贴过的一个funnel-web spider的现已破旧
的窝的上面，长得也像funnel-web spider。 |
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I***i
发帖数: 14557 | 19 今天（11/09）下午刚拍得，看来这个funnel web spider很勤劳，这么冷的天还结网捕
虫。
这个蜘蛛是不是以前的两个funnel web spider中之一？ |
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i*****s
发帖数: 15215 | 20 今年是第38届，优胜者将在一周后公布，建议看原帖大图，链接在下面。
What you looking at? This picture by Nikola Rahme from Budapest, Hungary,
shows a parasitic wasp peering into the lens of a microsope.
See no evil, speak no evil, detect the precise
location of evil using ultrasonic echoes: This image by University of
Cambridge researcher Dorit Hockman shows embryos of the black mastiff bat.
Spiky: Harold Taylor of Kensworth, Dunstable, entered this picture of a
house spider's face.
Baby love: This picture by Geir Drange shows a... 阅读全帖 |
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I***i
发帖数: 14557 | 22 http://www.wired.com/wiredscience/2012/12/panama-bug-count/
6,000 Insect Species Found in One Acre of Rainforest
（It took an army of committed scientists to get an accurate count of all
the arthropods in the San Lorenzo forest. Image: Jurgen Schmidl/University
of Erlangen）
A sweeping census involving more than 100 scientists and lasting almost a
decade has estimated that Panama’s San Lorenzo forest is home to an
estimated 25,246 arthropod species. The study is the most extensive survey
of insect... 阅读全帖 |
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I***i
发帖数: 14557 | 23 好长时间没贴蛛妈了。这期间蛛妈也不怎么省心，出走过几次，还好最后都回来了。拍
这组照片的前几天蛛妈出走，然后有一个小一点的蜘蛛（也是cellar spider）呆在蛛
妈网上（没拍照）。然后有一天我又看蛛妈的网，发现蛛妈回来了，并有猎物，不知道
是不是原来在网上的小蜘蛛。马上拍照。
不知道蛛妈历史的，请看
http://www.mitbbs.com/article_t/Animals/22697.html
蛛妈，#825，cellar spider
贴3张Blue Jay
最后贴一张Tufted Titmouse |
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l*t
发帖数: 10829 | 24 翻箱底又找出两张老照片.
03年和04年的夏天, 俺家后院曾有大蜘蛛进驻.
这种大蜘蛛的俗名叫Yellow Garden Spider (学名: Argiope Aurantia)
它还有一个外号, 叫Writing Spider. 在蜘蛛网的纵向有一条很明显很粗的zigzag线,
跟人的草书一般. 很有意思.
2003夏天
2004夏天 |
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I***i
发帖数: 14557 | 25 很多蜘蛛是游猎型的，居无定所，今天看见明天就看不见了。
不过已经发现了几只cellar spider和common house spider，就是去年蜘蛛楼的主角。 |
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o******e
发帖数: 3522 | 27 我觉得还是很爽的，就是画面差点，重复多点。 过场动画不对口形，让我非常郁闷。
另外，这个游戏就是activition以前出的spiderman的进化版本。
This game is basically an exact copy of activision's previous game Spider-
man and the web of shadows. Mutant invasion is the same as the symbiote
invasion with infected people. The powers of Alex are exactly the same as
Spider-mans running up walls,climbing up walls,shape shifting and shifting
into a black suit, making shields and big fists out of webs or your skin and
the birthing pods same in both games. The Army pr |
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l******n
发帖数: 11737 | 28 【 以下文字转载自 TVGame 讨论区 】
发信人: lalaphin (orpheus), 信区: TVGame
标 题: Spike Video Game Awards Nominees List Revealed
发信站: BBS 未名空间站 (Wed Nov 17 17:11:44 2010, 美东)
http://www.1up.com/news/spike-video-game-awards-nominees
The end of the year means awards season, and Spike has just announced its
nominees for this year's Video Game Awards. The show will air December 11 on
Spike, and is certain to feature plenty of new trailers for upcoming games.
The nominees for the big award of the night,
Game of the Y... 阅读全帖 |
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s*x
发帖数: 3328 | 29 I don't need their help, haha. If they want to leave, that is fine and I
could always find yonger and pretty girls than them, were I rich or alike.
Do you think Prof. Yang is unlucky because Ms Weng is not in true love with
him? Who cares! Yang gets what he wants and that's all. I am strong enough
to live along, but since pretty girls will satisfy my need, it won't hurt to
get some. It is like to keep a pet like a spider or a snake. They won't go
to your school/company to study/work for your, an... 阅读全帖 |
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M********t
发帖数: 355 | 30 有一阵经常在车里听中文歌.
儿子耳熏目染, 某天, 一上车就开始点歌: "I want to hear the spider song".
脑子里转了好几圈，在所有知道的中文歌里找啊找, 也没想起有关Spider的中文歌。
儿子只好用很不熟练的中文描述了半天， 才突然醒悟， 原来是.........
罗大佑的“东方蜘蛛”。 |
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c*********r
发帖数: 19468 | 31 here's the issue:
normally, clutch type lsds (including conical lsds, which can be considered
as a special variety of the clutch type) are still based on bevel-gears
let's look at a bevel-gear open diff:
1) when both sides have equal traction, turning the drive shaft won't
generate any wheel speed difference
2) when one side has weak traction than the other side, that'll be
transferred to the bevel spider gears as different torques, so the total
torque acted on the spider gears won't be 0 any mo |
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c*********r
发帖数: 19468 | 32 不是open diff，也不是viscous或者电控
整个系统和常用在驱动桥的离合式机械LSD一样
只不过驱动桥都是以50:50扭矩分配的bevel-gear diff为基础
这里需要不对称分配，所以换成了crown-gear，但是限滑的原理都是相通的
附着力的对比出现变化时，中差两侧出现微小的转速相对变化
这个变化会驱动spider gear，但你注意一下接触面的角度就会发现
这时spider gear会额外对一侧的crown gear有个压力
这个压力会触发离合器改变扭矩的分配比例
所以它是torque-sensing的，但是并不能做到原有的Torsen C的proactive
优点，比Torsen C小一些，大概也轻一些，成本肯定也低，差速器的动力损耗也许更小
缺点，不再是proactive的了，不过这点似乎对中差问题并不大
只要它还是torque-sensing就可以。
另外，它还有个潜在的优势，未来很容易附加电控在离合器的部分上
也许会有不小的潜力，但是目前RS5上首发的系统貌似还是纯机械的
至于torque vectoring这块，视频中演示的应该是标准版
这和Porsch |
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c*********r
发帖数: 19468 | 33 不是open diff，也不是viscous或者电控
整个系统和常用在驱动桥的离合式机械LSD一样
只不过驱动桥都是以50:50扭矩分配的bevel-gear diff为基础
这里需要不对称分配，所以换成了crown-gear，但是限滑的原理都是相通的
附着力的对比出现变化时，中差两侧出现微小的转速相对变化
这个变化会驱动spider gear，但你注意一下接触面的角度就会发现
这时spider gear会额外对一侧的crown gear有个压力
这个压力会触发离合器改变扭矩的分配比例
所以它是torque-sensing的，但是并不能做到原有的Torsen C的proactive
优点，比Torsen C小一些，大概也轻一些，成本肯定也低，差速器的动力损耗也许更小
缺点，不再是proactive的了，不过这点似乎对中差问题并不大
只要它还是torque-sensing就可以。
另外，它还有个潜在的优势，未来很容易附加电控在离合器的部分上
也许会有不小的潜力，但是目前RS5上首发的系统貌似还是纯机械的
至于torque vectoring这块，视频中演示的应该是标准版
这和Porsch... 阅读全帖 |
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c*********r
发帖数: 19468 | 34 GM还是不认真啊，Press Release里说ZL1的最大扭矩是550 lb-ft，合677 nm。
话说677 nm只有500 lb-ft，哪个数字是可信的呢？
这种Press Release搞乌龙的事记得FIAT也干过。Alfa Romeo 8C Spider发布时，
Press Release说它的变速器是5速的，可是之前的Coupe版8C Competizione是6速，
后来Alfa Romeo官网上的数据8C Spider果然也是6速。
实际上这年头想找个能用的5速半自动还真不易呢……
不过说到官网上的错误，就不胜枚举了，最近发现的一个就是Porsche的USA官网。
911 GT3 RS有关条目里，Features中介绍其引擎是使用VarioCam的，
但Technical Specs里又说成是VarioCam Plus，但是如果你点开，还是讲它是VarioCam。
据我所知，GT3 RS和GT3的引擎在缸盖设计上并没有多大的区别，
从其它渠道的信息看，可以肯定都是VarioCam而不是VarioCam Plus。
而Porsche USA官网上关于911 GT3的条目... 阅读全帖 |
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c*********r
发帖数: 19468 | 35 其实上300km/h并不容易啊，很多400-450hp的正牌跑车标称都还进不了这个俱乐部呢
比如360 Modena/Spider、V8 Vantage/Vantage Roadster、8C Competizione/Spider
……
很多啦，都还进不了这个俱乐部
如果是轿车衍生车型，迎风面积大了不少，没有个450hp以上还是很难做到的 |
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i****x
发帖数: 17565 | 36 这个数据没见过，找了一会，找到个强帖。
s2k数据找不到。网上有两个说法：7k，22k。后者估计是搞错了。前者似乎又有点太低。
Alfa 159 - 31.400Nm/degree
Aston Martin DB9 Coupe 27,000 Nm/deg
Aston Martin DB9 Convertible 15,500 Nm/deg
Aston Martin Vanquish 28,500 Nm/deg
Audi TT Coupe 19,000 Nm/deg
Bugatti EB110 - 19,000 Nm/degree
BMW E36 Touring 10,900 Nm/deg
BMW E36 Z3 5,600 Nm/deg
BMW E46 Sedan (w/o folding seats) 18,000 Nm/deg
BMW E46 Sedan (w/folding seats) 13,000 Nm/deg
BMW E46 Wagon (w/folding seats) 14,000 Nm/deg
BMW E46 Coupe (w/folding seats) 12,500... 阅读全帖 |
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e**n
发帖数: 1326 | 37 这个撑着两面的力,一部分是从spider gear的那个轴和cam ramp提供的，一部分是用弹
簧提供的。
单轮离地后，spider gear的那个轴和cam ramp提供的那部分撑力就没有了 (torque
sensing的那部分），但是弹簧提供的还是有的啊(static coupling)？ |
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x*b
发帖数: 5723 | 38 恩，这个比较合理。不过30万的Spider属于低配了，不符合土豪的气质啊...
市面上的Spider普遍都在$32-36万左右，如果是同一年1000miles以内的二手CPO，基本
比全新的MSRP还贵。能把一台车做到快换代了还能加价提车，也只有Ferrari了(and I
totally agree their business model). |
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x*b
发帖数: 5723 | 39 不是Tough，是衡量标准的问题吧。我觉得熊猫说的不错，价位或品牌到了一定程度，
性价比已经不是重点，性能也不是唯一衡量标准了。别说Super Sedan这个级别，哪怕
性能为首的跑车级别：991 Turbo S或GTR大部分情况下跑的比458/458 Spider快，还便
宜30-70%，但是如果钱不是问题的前提下你买991 Turbo S/GTR还是458/458 Spider？ |
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w*******y
发帖数: 60932 | 47 Baked, not fried!!
Link:
http://www.thinkgeek.com/caffeine/wacky-edibles/e1b4/
Oven-Baked Tarantula
* Ready to snack on right out of the package (just remove the fangs
first).
* Delicacy of Cambodia.
* Collected from carefully monitored sources to ensure their
preservation, and cooked by locals.
* Baked, not fried - so it's much healthier than normal fried tarantulas
you can get all over.
* Can also be warmed up in an oven - instructions included.
* DID WE MENTION THIS ... 阅读全帖 |
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w*******y
发帖数: 60932 | 48 Line6 B-Stock Amps & Pedals up to 75% off @ Sam Ash online
I'm not sure what B-Stock is, but here's what it says:
This has been resealed in the Line6 warehouse. The item carries the full
manufacturer's warranty as well as being backed by our 45-Day Satisfaction
Guarantee.
Some great deals if you are looking for a Line 6 amp/pedal....Quantities are
limited.
Here are a few examples
Line6
Spider III 15watt Guitar Combo Amp (B-Stock)
You Save: $150.00 (75%)
The Line 6 Spider III guitar combo amplifi... 阅读全帖 |
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w*******y
发帖数: 60932 | 49 Hive
iOS iPhone
Link:
http://itunes.apple.com/us/app/hive/id335501575?mt=8
"Hive for the iPhone: brilliant fun." - (Credit: Scott Stein/CNET) ... NEW
PRICING Feb 1. Many for making us "What's Hot" in January !
"Hive offers diverse gameplay, encompassing single-player action, two-player
action (sharing one phone), and four different tile sets. 8/10" - brickroll
.com
Lotusland Studios is proud to present the official version of John Yianni's
award winning game Hive.
Hive is a board game with a di... 阅读全帖 |
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w*******y
发帖数: 60932 | 50 Games
o Madden 12 - $3 (originally $5)
o Dead Space - $1 (originally $7)
o The Sims 3 -$1 (originally $7)
o Battlefield Bad Company 2 - $1 (originally $3)
o Fight Night Champion - $1 (originally $5)
o RISK - $1 (originally $3)
o The Sims Medieval - $1 (originally $5)
o Shift 2 Unleashed - $1 (originally $5)
o Need for Speed Hot Pursuit - $1 (originally $5)
o Need for Speed Undercover - $1 (originally $3)
o Real Racing - $1 (originally $3)
o Scrabble - $1 (originally $2)
o Tetris - $1 (originally... 阅读全帖 |
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