W*****5
发帖数: 408 | 1 Back to the states after probably the best vacation I ever had :)
More info about the ski resort:
1. Niseko has three areas, Hirafu, Village, and Annupuri, ranging from
largest to smallest. The total skiable areas combined are about the size of
Northstar, so not that big. Elevation is not that high, about 1300m or 5000
feet. The slope uses the European system of green, red, and black. You can
cross the ski areas at the top of the mountain, or take shuttles.
2. The most unique characterics is Nis... 阅读全帖 |
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n*****a
发帖数: 1327 | 2 where is good for squaw spring skiing? most part of this mountain
doesn't get hit by sun much.
maybe broken arrow? gold coast? emigrant?
i was taken around by some friends know heavenly very well and had some
fun doing spring skiing, hunt and harvest corn. it looks like all about
when and where, very similar to fishing or hunting. skied some nice
slopes with a couple inches of corn on top and had some slopes all to
us. |
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f********y
发帖数: 883 | 3 you get a good recovery this summer and come back in the winter. The biggest
storm I skied is 25in overnight (truly sick but you are only able to move
in those few steep slopes at vail), can not imagine those over 100in dump in
the tahoe area, must need very very steep slopes to enjoy those really
thick staff. |
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T*****o
发帖数: 53 | 4 http://www.sacbee.com/2011/12/22/4139299/investigation-continues-into-death.html
He was 7 years old and loved to ski, a child described as simply "happy out
on the slopes."
Now members of the Sugar Bowl Ski Team are being comforted by grief
counselors and are offering their own condolences and support to the family
of John Henderson, who was a second-grader at North Davis Elementary School.
The boy, a member of the ski team, fell Sunday from a chairlift he was
riding with two of his teammates.... 阅读全帖 |
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x***k
发帖数: 3311 | 5 We REALLY had department meetings on the slopes in afternoons and evenings
at least once a year. More often we take customers to the slopes for
business discussions. |
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I********e
发帖数: 6130 | 6 太厉害了...我是今年才上蓝道的. 以前只在东部滑过几次, 好不容易在绿道上找到了
感觉(总算能parallel turn了),到西部来的第一天去绿道信心就被打击没了. 只好又回
去了bunny slope...惨(可怜的BF以为在bunny slope日子结束了,结果...). 第二次才
重新到了绿道上. 现在绿道的日子总算一去不复返了..嘿嘿. |
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q*c
发帖数: 17993 | 7 REI的这篇文章挺好，针对滑雪Goggle的选择，我转贴过来：
http://www.rei.com/learn/expert-advice/goggles.html
Goggles for Skiing and Snowboard: How to Choose
/How%20to%20Choose%20Ski%20and%20Snowboard%20Goggles.jpg
Goggles offer you better eye protection than sunglasses do when you're
snowboarding or skiing for the day.
At first glance, it may not be apparent why goggles range so widely in price
—from $25 to over $200. Here's how to make sense of the technology and find
the right pair for your needs.
Why Wear Goggles?
Th... 阅读全帖 |
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H*****A
发帖数: 114 | 8 【 以下文字转载自 Parenting 讨论区 】
发信人: HowisLA (WhatisLA), 信区: Parenting
标 题: 也问问滑雪
发信站: BBS 未名空间站 (Mon Dec 30 23:24:50 2013, 美东)
因为自己实在是不喜欢滑雪，一直没敢带小孩子去试过。好多年前仅仅滑过一次，是有
教练带的。自己稀了糊涂的一直以为是在bunny slope上。可是后来是上了坐lift才能
去的地方，请问懂行的，那是不是就是绿道了？还是有可能还是bunny slope？因为那
个坡度已经是我的极限了。
另外当时教练第一次是带着我上lift，然后倒着滑带我滑下来的。那一次一个跟头没摔
，后来自己跟着滑就控制不好速度了。请问现在的教练还会在小孩子前面倒着滑来给他
们多点自信吗？我当时上得是group lesson，但是教练只带了我一个人上lift，是教练
轮流单独带每个人上lift吗？还是只是碰巧那天人不多？请熟悉滑雪程序的帮我看看吧
。多谢了！ |
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y****i
发帖数: 5690 | 9 所谓重心放到两脚的外面，是不是指的是这个视频里面的一些镜头，当双膝朝一个方向
倒的时候，上身则需要朝相反的方向倒，以保持平衡？
http://vimeo.com/7571424
譬如2：04的地方，两个膝盖都朝SLOPE方面倒，而身体则稍微朝VALLEY方向倾斜。估计
如果膝盖歪的越厉害，则身体需要侧的更多以保持平衡？
我理解歪的越厉害，EDGE的摩擦力越大，会降速更多？
另外问一个这里面的练习好像就是GARLAND DRILL吧？就是从SLOPE一边不断重复一个方
向转弯，直到走到另外一边为止？ |
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C**********r
发帖数: 414 | 10 刚开始Ski就听说Ski入门容易提高难。觉得自己现阶段遇到瓶颈了...想请教版上大牛
像我目前的情况该如何提高，如何规划下个Season的Ski。
一、基本参数
身高168cm，体重60~65kg，Ski长度153cm，Boots的Flex是75。
二、学习经历
1.15~16 Season
是第一个Season。第一次滑是报了一个Ski Lesson，什么都不懂，摔得蛮厉害。休息了
一个月才滑第二次，第二次把附近小雪场的绿道大多数刷完了，虽然很生硬，也摔了两
跤。之后又在另一个大些雪场刷了些绿道。再滑了两次，觉得绿道刷得有点熟练了，就
很生硬地试着用Snowplough下简单的蓝道，主要还是在绿道上。总共自己练了8次。雪
季快结束的时候，已经可以用一只脚站立，用Parallel Turn下蓝道及简单的蘑菇蓝道
了。感觉有点像跑步。
2.16~17 Season
这个Season一开始，去下了上个Season没有下成功的比较陡的蓝道，想不到，大半年没
有Ski，居然一次下成功了。但还是觉得绿道比较comfortable一点。又滑了5、6次，开
始觉得蓝道也还comfortable，并且... 阅读全帖 |
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C**********r
发帖数: 414 | 11 刚开始Ski就听说Ski入门容易提高难。觉得自己现阶段遇到瓶颈了...想请教版上大牛
像我目前的情况该如何提高，如何规划下个Season的Ski。
一、基本参数
身高168cm，体重60~65kg。
Ski长度153cm，Boots的Flex是75。
就是平常店里租用的Sport Ski PKG，不是Premium或者Demo。
二、学习经历
1.15~16 Season
是第一个Season。第一次滑是报了一个Ski Lesson，什么都不懂，摔得蛮厉害。休息了
一个月才滑第二次，第二次把附近小雪场的绿道大多数刷完了，虽然很生硬，也摔了两
跤。之后又在另一个大些雪场刷了些绿道。再滑了两次，觉得绿道刷得有点熟练了，就
很生硬地试着用Snowplough下简单的蓝道，主要还是在绿道上。总共自己练了8次。雪
季快结束的时候，已经可以用一只脚站立，用Parallel Turn下蓝道及简单的蘑菇蓝道
了。感觉有点像跑步。
2.16~17 Season
这个Season一开始，去下了上个Season没有下成功的比较陡的蓝道，想不到，大半年没
有Ski，居然一次下成功了。但还是觉得绿道比较comf... 阅读全帖 |
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g****e
发帖数: 56 | 12 【 以下文字转载自 Ohio 讨论区 】
发信人: gcogle (GQQGLE), 信区: Ohio
标 题: 寻参加Miami University今冬滑雪旅游的校友
关键字: 滑雪,Miami University
发信站: BBS 未名空间站 (Tue Oct 17 23:20:34 2017, 美东)
Miami University最近在组织滑雪旅游活动。时间是明年2月1日到2月5日，地点是科罗
拉多的steamboat。有兴趣一同前往的校友请站内联系。
邮件原文：
Take a young alumni ski trip Feb. 1-5! Enjoy four nights in luxurious
mountainside lodging surrounded by some of the best beginner and expert
terrain in North America. Spend your days on the slopes or around town with
one of the many non-skier activities. L... 阅读全帖 |
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e*****m
发帖数: 722 | 13 https://steep.ubisoft.com/game/en-US/news/152-286195-16/play-steep-for-free-
from-march-10-12
Steep gives you free rein to explore a massive open world of winter sports,
using skis, snowboards, paragliders, and even wingsuits to tackle
competitions and traverse the beautiful slopes of the Alps and Alaska. And
you can jump in for no cost from March 10-12, when Steep will be free
through the weekend on Xbox One, PS4, and PC (via Uplay).
The free weekend will offer access to the entire game, giving... 阅读全帖 |
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a*o
发帖数: 19981 | 14 来自主题: Collectibles版 - 抛光版大饼 http://mintnewsblog.blogspot.com/2011/04/hot-springs-5-ounce-si
Hot Springs 5 Ounce Silver Uncirculated Coin Scheduled
Posted: 04 Apr 2011 12:17 PM PDT
The United States Mint has quietly added the first of the collector versions
of the 2010 America the Beautiful 5 ounce Silver Coins to their product
release schedule.
Now listed on the schedule with a release date of April 28, 2011 is "2010
America the Beautiful Five Ounce Silver Uncirculated Coins – Hot Springs
National Park".
Collectors have be... 阅读全帖 |
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m***y
发帖数: 14763 | 15 HOA有规定不能种大树
How about dwarf fruit trees? And are you allergic to pollen?
Do you like Viola, Pansy and the kind? They can survive that slope.
If all above failed, go with creeping juniper. "Blue rug" would look nice on
the slope. |
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b*s
发帖数: 82482 | 16 豪宅。这个slope是要注意，特别是有小孩子……
赞水景豪宅。 有slope注意安全。 |
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g****g
发帖数: 1828 | 17 In probability theory, the normal (or Gaussian) distribution, is a
continuous probability distribution that is often used as a first
approximation to describe real-valued random variables that tend to cluster
around a single mean value. The graph of the associated probability density
function is “bell”-shaped, and is known as the Gaussian function or bell
curve:[nb 1]
f(x) = \tfrac{1}{\sqrt{2\pi\sigma^2}}\; e^{ -\frac{(x-\mu)^2}{2\sigma^2}
},
where parameter μ is the mean (location of the pe... 阅读全帖 |
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s********n
发帖数: 4346 | 18 The Arguments Against Gay Marriage
Well, of course there are a lot of reasons being offered these days for
opposing gay marriage, and they are usually variations on a few well-
established themes. Interestingly, the Supreme Court in Hawaii has heard
them all. And it found, after due deliberation, that they didn't hold water.
Here's a summary of the common reasons given:
1. Marriage is an institution between one man and one woman. Well, that's
the most often heard argument, one even codified in a... 阅读全帖 |
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d********f
发帖数: 43471 | 19 美国纽约布鲁克林（ Brooklyn）一个以安全见称的社区，接连发生十宗性侵犯案，警
方未能破案，警告女士别穿短裙、热裤上街，以免露肉太多招惹色魔犯案，结果激怒女
居民。
帕克斯洛普（ Park Slope）是纽约市数一数二好住的地区，去年更获《纽约杂志》（
New York Magazine）选为最佳社区。但由今年 3月起，布鲁克林发生了至少十宗企图
性侵犯案和一宗强悬案，不少女性害怕得几个街口也召车代步，也有人成立单车巡
逻队，号召志愿者护花，从地铁站送女士回家。
女士心慌慌，警方还「落井下石」。有男性巡警当街向女士们训示穿衣之道， 25岁的
洛伦就曾在离家三个街口的地方被男警截停「训话」。
警员先问明她知不知道近期发生了多宗强案，之后指着她身上的 T恤和短裤，说：
「你不觉裤子太短吗？」又说这种打扮会令色狼觉得「容易得手」，「那些伙正正
是找你这种女子下手」。该警员随后又向两名穿短裙的女子作同类训示。
洛伦指警员的话冒犯她，不满警员暗示若她遇麻烦也是「自找」。她向《华尔街日报》
说：「我完全不同意他们的观点，我的打扮并无不当或挑逗，我的衣着完全不是问题所
在。」
纽约警方发... 阅读全帖 |
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N*****m
发帖数: 42603 | 20 同一天说的。看来确实j点了。
"Little by little, in the name of fighting terrorism, our Bill of Rights is
being repealed.... The Patriot Act, as bad as its violation of the 4th Amend
ment, was just one step down the slippery slope. The recently passed [NDAA]
continues that slip toward tyranny and in fact accelerates it significantly.
... The Bill of Rights has no exemption for 'really bad people' or terrorist
s or even non-citizens. It is a key check on government power against any pe
rson. This is not a weakn... 阅读全帖 |
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L**********y
发帖数: 2525 | 21 前排广告位，免费赠予第三页的真神：
****
发信人: Eloihim (真神), 信区: LES
标 题: Re: 如果同性可以结婚，那父女，母子为什么不可以?
发信站: BBS 未名空间站 (Fri Jul 1 07:18:40 2011, 美东)
要講邏輯是吧？ 找我，我邏輯專業的。
你這叫 Slippery Slope 的邏輯錯誤
http://en.wikipedia.org/wiki/Slippery_slope
中文怎麼翻譯我不清楚，大致有點像說“上綱上線“。
比方說好了，如果我走路邊人行道，你擋住我了，我請你
向旁邊讓一步，就一步就好，您不幹了
『我讓你一步的話，下次你就會要我讓兩步，三步，到最後
我都讓到街心去了，會被車撞，你太可惡了』
這就是 slippery slope 的錯誤，讓一步和讓十步是本質上不同，
同理，同性結婚和亂倫是完全不同的問題，拿亂倫問題來干擾
同性戀問題是沒道理的。
希望這樣解釋大家可以理解。 |
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E*****m
发帖数: 25615 | 22 要講邏輯是吧？ 找我，我邏輯專業的。
你這叫 Slippery Slope 的邏輯錯誤
http://en.wikipedia.org/wiki/Slippery_slope
中文怎麼翻譯我不清楚，大致有點像說“上綱上線“。
比方說好了，如果我走路邊人行道，你擋住我了，我請你
向旁邊讓一步，就一步就好，您不幹了
『我讓你一步的話，下次你就會要我讓兩步，三步，到最後
我都讓到街心去了，會被車撞，你太可惡了』
這就是 slippery slope 的錯誤，讓一步和讓十步是本質上不同，
同理，同性結婚和亂倫是完全不同的問題，拿亂倫問題來干擾
同性戀問題是沒道理的。
希望這樣解釋大家可以理解。 |
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E*****m
发帖数: 25615 | 23 【 以下文字转载自 LES 讨论区 】
发信人: Eloihim (真神), 信区: LES
标 题: Re: 如果同性可以结婚，那父女，母子为什么不可以?
发信站: BBS 未名空间站 (Fri Jul 1 07:18:40 2011, 美东)
要講邏輯是吧？ 找我，我邏輯專業的。
你這叫 Slippery Slope 的邏輯錯誤
http://en.wikipedia.org/wiki/Slippery_slope
中文怎麼翻譯我不清楚，大致有點像說“上綱上線“。
比方說好了，如果我走路邊人行道，你擋住我了，我請你
向旁邊讓一步，就一步就好，您不幹了
『我讓你一步的話，下次你就會要我讓兩步，三步，到最後
我都讓到街心去了，會被車撞，你太可惡了』
這就是 slippery slope 的錯誤，讓一步和讓十步是本質上不同，
同理，同性結婚和亂倫是完全不同的問題，拿亂倫問題來干擾
同性戀問題是沒道理的。
希望這樣解釋大家可以理解。 |
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t*******d
发帖数: 2570 | 24 这一章比较有意思，有意思的地方是作者在论证神造世界一定有一个精确到所有细节的
计划的时候用了许多逻辑上有问题的论证手段来说明他的观点。下面来一一列一下：
1。“我们无法想像一位有无限智慧与能力的神，在创造世界的时候却没有一个明确的
计划”。
这个“我们无法想像”的用法在这一章里出现了两次。用法是这样的：我们无法想像神
创造世界的时候没有明确的计划，那么神创造世界的时候就是有计划的。这个“无法想
像”的论证法是个典型的逻辑错误。因为无法想像一件事能不能发生跟这件事能不能发
生没有任何关系。以前的人无法想像铁船会在水上漂起来，铁做的飞机能够飞上天，但
是这些事情都发生了。如果非基督徒说“我无法想像公正，慈爱的神会干出杀婴屠城的
事来，所以神一定是罪恶的”。基督徒一定会反对这样的推理方法。认为非基无法想像
的事情并不代表不可能发生。但是这个作者在这里用了完全相同的推理方法来给“神有
一个计划”来佐证。
2。“人做事尚且如此，神做事岂不更是这样！”
这个也算是很常见的论证方法，模式是人做事是如何如何的，神做事也应该是如何如何
。这是了类比的方法，类比本身是一个可行的论证方法，但是前提是类比的两... 阅读全帖 |
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a*****a
发帖数: 438 | 25 black 1 diamond is okay - if it's just steeper slope. in case of very short
turns and big slopes and big bumps, i just turned back:) |
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r******0
发帖数: 2753 | 26 got it from yahoo answer.
It really depends on the slope, and the skier. Pros go 80+ mph. In generall,
and intermediate skier on a moderate (blue) slope will go between 15-20mph.
Most skiers will never ski at 30 MPH.
看来就算在黑道上，我也没到过60km/h。:-( |
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v*******n
发帖数: 499 | 27 【 以下文字转载自 NewYork 讨论区 】
发信人: hitmantb (hitmantb), 信区: NewYork
标 题: 四年看房，纽约附近的学区房大比拼-27 Areas Ranked
发信站: BBS 未名空间站 (Sat Aug 18 22:27:40 2012, 美东)
四年前就开始看房，两人世界到一家四口，好长的四年, 下个月终于可以搬新家了。
四年，无数个周末，无数个夜晚，无数次在Google Street View看陌生街区，我们把看
房当作了一种乐趣, 一种去吃新餐馆看新街区的乐趣。 新泽西，长岛，Westchester,
从来不用Buyer's Agent。 因为如果房子好，一定卖的很快，能卖很快的房子，
Seller Agent必然不会希望跟Buyer Agent分佣金, 必然会优先处理没有Buyer Agent的
买家。 我们跟最喜欢的几个地区的Broker都有联系，但从没签过协议，直到最后这个
房子。
我看房是一个个Zip Code看过去的，75分钟能到曼哈顿的地区，可以说是无一不知，无
一不晓。 开始两人世界的时候， 对学区不是特别在乎， ... 阅读全帖 |
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v*******n
发帖数: 499 | 28 【 以下文字转载自 NewYork 讨论区 】
发信人: hitmantb (hitmantb), 信区: NewYork
标 题: 四年看房，纽约附近的学区房大比拼-27 Areas Ranked
发信站: BBS 未名空间站 (Sat Aug 18 22:27:40 2012, 美东)
四年前就开始看房，两人世界到一家四口，好长的四年, 下个月终于可以搬新家了。
四年，无数个周末，无数个夜晚，无数次在Google Street View看陌生街区，我们把看
房当作了一种乐趣, 一种去吃新餐馆看新街区的乐趣。 新泽西，长岛，Westchester,
从来不用Buyer's Agent。 因为如果房子好，一定卖的很快，能卖很快的房子，
Seller Agent必然不会希望跟Buyer Agent分佣金, 必然会优先处理没有Buyer Agent的
买家。 我们跟最喜欢的几个地区的Broker都有联系，但从没签过协议，直到最后这个
房子。
我看房是一个个Zip Code看过去的，75分钟能到曼哈顿的地区，可以说是无一不知，无
一不晓。 开始两人世界的时候， 对学区不是特别在乎， ... 阅读全帖 |
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c***y
发帖数: 615 | 29 I mean I am trying to determine primer efficiency using the same batch of
cDNA at different days. They could be vary from 50% to 90%. Based on Qiagen
qPCR protocol, all primer efficiency should be above 83% (the corresponding
slope is less than 3.8).
Every time I did serial dilution, R^2 is pretty good; but slope number
differs markedly time by time.
robust
cycles |
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s******y
发帖数: 220 | 30 用bradford测浓度，我用的是1mg/ml的BSA作为standard， 测1ul,2ul, 4ul, 8ul,
16ul 的OD
得到一个线性的standard curve。
然后测sample同样是测了这个梯度，得到另外一个线性的curve，
如果要计算sample的浓度，是用sample curve 的 slope 去除 standard curve的
slope吗？
请教了，谢谢。 |
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h***0
发帖数: 248 | 31
我们后来都只滑off-track(slope),这种比较刺激
好多滑off-slope的都摔骨折,还有摔到后背,脖子的,狠危险
我同事上次就扭到膝盖,被小雪橇拉下山的 |
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b******y
发帖数: 627 | 32 Not much relationship between the two. IC50 shows how effective it is (the
lower IC50, the more effective it is). Slope shows how cooperative it is.
for example, if the slope is very large, it is called hypersensitive, i.e.
it takes a small concentration change (around IC50) to become effective from
ineffective. |
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发帖数: 1 | 33 导语：回观国内市场，这些不靠谱、不合医学逻辑和没有临床价值的事情反而愈演愈烈
，耗费了大量的资本和医疗资源，可谓几大乱象
本文作者代号HHH，目前为一家人工智能医疗创业公司的CEO，有10多年硅谷的高科技公
司的工作经历(Google, Cisco等)，斯坦福商学院Sloan Fellow。
业内人的“针砭时弊”：AI医疗界的3大乱象以及如何评价医学人工智能的成果？
With machine learning situated at the peak of inflated expectations, we
can soften a subsequent crash into a “trough of disillusionment” by
fostering a stronger appreciation of the technology’s capabilities and
limitations.
今年6月底的《新英格兰》刊出了一篇观点文章《Machine Learning and Prediction
in Medicine — Beyond the Peak of ... 阅读全帖 |
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w******g
发帖数: 67 | 34 As an investor assumes more risk and moves upward on the efficient frontier,
the slope of the efficient frontier curve most likely:
a. increase and expected return per unit of risk increase
b. increase and expected return per unit of risk decrease
c. decrease and expected return per unit of risk increase
d. decrease and expected return per unit of risk decrease
Are the slope and "expected return per unit of risk" the same thing? I
thought the answer is d.
But the answer from answer sheet is c. S |
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y*********g
发帖数: 576 | 35 作SLOPE STABILITY ANALYSIS的时候，如果用CIRCULAR SEARCH TO FIND THE CRITICAL
SHEAR SURFACE, DO I NEED TO SET THE LIMIT OF THE EXIT ANGLE TO 45-F/2.在
SLOPE/W有这个OPTION,但是有人知道UTEXAS 里面有没有设定？如果我SEARCH 出来的
SURFACE，角度大于45，可能吗？ |
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y****a
发帖数: 172 | 36 不对。
如果是slope failure的话，应该往河的方向倒。
既然是往 河相反的方向倒，可能是整体倾覆，防汛墙的slope failure，或者超孔隙水
压力产生的液化。我觉得最后一种可能性更大。 |
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j********n
发帖数: 792 | 37 A survey of the foundation was performed. The overall tilt of the foundation
was less than 0.15% as evaluated along the major axis. Several American
Society of Civil Engineers (ASCE) Foundation Subgroups consider tilt of less
than 1% acceptable. The local floor slope of the foundation was less than 0
.1 % in the front bedroom and other areas of the residence. Local floor
slope of up to 0.5% is acceptable to FHA and other lenders. The interior
distress observed within the residence was cosmetic a... 阅读全帖 |
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D*****a
发帖数: 2847 | 38 是啊
decreasing marginal utility并不必要
Becker 1962 JPE
aggregated downward sloping demand curve完全可以来自于irrational的
individual decision makers
所以张五常觉得经济分析完全可以downward sloping demand出发
而不是从utility maximization出发 |
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G****n
发帖数: 145 | 39 But Andrei Shleifer, who won the clark medal is the real deal!
The law and economics of self-dealing[PDF] from uva.nl…, R La Porta, F
Lopez-de-Silanes, A Shleifer - 2005 - nber.org
... Andrei Shleifer Department of Economics Harvard University Littauer
Center M-9 Cambridge,
MA 02138 and NBER a*******[email protected] Page 3. 1 1. Introduction. Over the
last twenty
years, both academic and practical approaches to corporate ...
Cited by 462 - Related articles - Library Search - BL Direct - All 71
vers... 阅读全帖 |
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ET
发帖数: 10701 | 40 compensator是个OTA我明白，但从我贴的示意图上来看，它输出一个ic(t), 这个ic(t)
怎么就成了inductor上的peak current呢？这里面一定有个定量关系吧。
对buck来说，inductor上的current，在充电过程中，有slope = (v0-vg)/L, 在放电过
程中，有slope = v0/L,
同时，output voltage上也有ripple, 用linearwise piece来近似的话，应该是vout=v
dc + vac, 这个vac应该控制着ic(t) - 经过compensated的OTA.
我这个推导中，漏了2个地方，一个是inductor charge cap.得到vac,
如果这个vac的式子有了，我乘以Gm，也就能得到ic(t)了。
anything
. |
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b*****f
发帖数: 50 | 41 hec-ras solves the energy equation for steady gradually-varied flow with the
standard step method and the continuity and momentum equations for unsteady
gradually-varied flow with the finite difference numerical method.
hec-ras uses the manning equation for calculating the energy and friction
slopes with the assumption that the energy and friction slopes of gradually
varied flow is equal to those of the uniform flow where the manning equation
was developed.
manning equation is used by convention |
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h**********r
发帖数: 25 | 42 今天调了一天的基线但还是没有搞定。仪器是perkin-ekmer DSC7.
按调基线步骤，两cell都清空时调balance ,slope两旋扭，基线可以调的很好，可一旦开
始run sample, for example, indium, 基线就翘到老高去了， big slope. 我将两个空
的reference (no sample)放进两个cell,
再在同样的条件下走一遍，基线也是翘到老高,完全变样。
我个人认为两个同样的空样refernce 和cell里什么都没有走出来的基线应该是一样的，
是吗？ 问题的症结会是哪呢？我以前也是这么调的，没出现过这样的问题。 |
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n***p
发帖数: 7668 | 43 Let me explain. But first let me give you a simpler expression
for f.
a(x) = 2 tau floor( x /(2 tau) ) ;
b(x) = 2 tau ceiling( x /(2 tau) ) ;
f1(x) = v/tau*(x-a);
f2(x) = -v/tau(x-b);
f(x)=min(f1,f2);
Since the function you want is periodic with period 2tau,
floor( x /(2 tau) )is the maximal integer not bigger than
x/(2tau). So a(x) is the left end point of the interval
x belongs to and b(x) is the right end point. Then
f1 is the line passing the left end point with slope v/tau,
and f2 is the l... 阅读全帖 |
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e*****e
发帖数: 81 | 44 Assume that the required rate of return on the market, r (m), is given
and fixed, if the yield curve were upward- sloping, then the SML would
have a steeper slope if 1 yr treasury securities were used as the risk
free rate than if 30- yr treasury bonds were used for r(RF) |
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A**u
发帖数: 2458 | 45 这就是convex 定义
与下面的关系等价， X1 < X2 < X3
(C(X2)-C(X1))/(X2-X1) < (C(X3)-C(X2))/(X3-X2);
这两个关系 用中值定理证明， 充分必要
第二关系(x1,x2)的slope 小于 (x2,x3)的slope 是option的3个性质之一 |
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p**e
发帖数: 41 | 46 我是说有可能你说的两个portfolio的payoff相等啊。
比如， c（k＝10）与c（k＝14）的pf的payoff是过点（10，0），（14，4）的slope为
1的线段加上过点（14，4），（16，8）的线段的组成，
而2个p（k＝12）的pf的payoff是过点（10，4），（12，0）的slope为－2的线段，
显然这两个payoff可以在点（34/3，4/3）相交， 也就是在stock price为34/3=11.
3333时候，两个portfolio的payoff相同啊。
hints. |
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W**********r
发帖数: 68 | 47 5. Suppose you have bought a July ITM call and sold an August ATM put.
What would be your delta in this position? Once you hedged out your delta
what are the following greeks:
-Gamma
-Vega
-Rho
-Theta
这个我觉得是long Gamma，short Vega， long Rho， paying Theta
6. Suppose you know the following information about a market:
- Future is at 66
- 70 strike straddle is trading at 27
- 50-60 put spread is at 2.5
- 50-60-70 put fly is at .2
- Assume volatility is constant across strikes
Using the prices given an... 阅读全帖 |
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j***o
发帖数: 5 | 48 您太自谦。发难的那位叫兽一向以出题刁砖骨怪闻名我考虑是不是
应该应用Clapron Slope: dp/dT=dS/dV, here we know Calpron
Slope is positive (dp/dt > 0). |
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c*********t
发帖数: 340 | 49 是两个model都可以吗
另外，每个independent variable的beta value的P值怎么refer呀
谢谢
刚开始练R
不知道自己描述得对不对
具体是，
x <- glm(PHENOGROUP2 ~ Combo.new[,e[i]] + PHENOGROUP3, family="binomial",
data=Combo.new)
因为是在一个loop里面，想把每次的结果（beta[slope] 和P）输出到一个matrix里去
但是x$coeff只能有slope，P value不知道用什么来引用
谢谢啦 |
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