r*********e
发帖数: 29495 | 1 【 以下文字转载自 Seattle 讨论区 】
发信人: renaissance (ole), 信区: Seattle
标 题: 远山的召唤 – Hurricane Hills Trail
发信站: BBS 未名空间站 (Mon Aug 29 15:12:36 2011, 美东)
远山的召唤 – Hurricane Hills Trail游记
周六，早早起来，为了赶过海的轮渡，8点多，Edmonds码头的车不多，天空兰兰的，远
处海面有少许的雾气，外面的空气清冷但是清新，我们登上了8点50的轮渡，甲板上有
不少的游客，阳光温暖的照在海面上。
到达Kingston，我们开车北上，很快来到熟悉的小城Port Gamble，下来走走，小城的
很多business还都没有开张，旁边海湾的雾气还弥漫在小城的周围，不过阳光正在一点
点地驱散这些白色的雾气，越来越多的释放出蓝色的天空。
开车继续前行，一路上雾气渐渐散去，经过薰衣草小城Sequin，我们抵达了Port
Angles，这次我们打算到Bella Italia去看看，这是Twilight里面，Bella和Edward第
一次... 阅读全帖 |
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B******N
发帖数: 445 | 2 这是第一阶段的瓶颈，大部分人过不去。
总体来讲你上身还比较稳定，不错。但你angle 不够，重心不够低，太高。但你如果硬
增加 angle,肯定就摔了，因为你速度不够。但你速度太快就一定能angle吗？也不一定
，如果你的ski太短太软属于 beginner ski, 速度快，它可能咬不住，或者太短容易转
而速度起不来。或许你需要一个下一个 level的skis. 你需要 ride ski, respect its
radius. 你小于 radius 就Z turn和很多 skidding.
还有你的重心有点靠后， 我喜欢说让ski在你身下，而不喜欢说重心靠前，前者容易强
调用腿的伸展来做到，后者容易让人身体来调节，这是初学者的做法。
我个人突破是通过用了 advanced ski来实现的。用了两个 season,突然 get it. 刚开
始我老是转的小于半径，否则我老觉得太快，超出自己的 comfort zone。突然一天，
我滑的非常 aggressive,换刃很快，基本 flat时间极短，速度起来后你的重心必然降
低， angle变大。很少skid。换刃的时候有种ski跳起来... 阅读全帖 |
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S*******y
发帖数: 7 | 3 Use laces to shoot the ball.
我儿子也是2003的.他每十天和我一起练习3次soccer. 每次90分钟.
第一次 - 传接球.
第二次 - 射门.
第三次 - dribbling, turning, and 1v1 skills.
射门一共3部分.
1) Free kick - inside bending. Before he does it with his dominant foot, I
throw the ball very hard to him. I want him to receive the ball in the air
first. I put a cone at the far end. He needs to kick the ball into the 1
meter area of the net from the line of the 18 yard box. He does it from 3
angles - 85 degrees, 50 degrees, and 35 degrees. He needs to do... 阅读全帖 |
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s****e
发帖数: 914 | 4 我找不到Terry讲解这些比较“advanced”的视频或资料。感觉TI自己的学生在不同阶
段都会有各种类似的质疑。一部分人离开TI，另一部分被说服。
David Shen自己被竹内说服的过程见：http://www.dshen.com/blogs/training/archives/total_immersion_advancing_beyond_beginner.html
Main argument：你已经学得太好了，“After going through all this, Shinji then
tells me there are about 4-5 people who have progressed in TI to this stage
, and that there are 20-30 in Japan who are working now on adjusting their
stroke for speed. I state this not to brag about how I've progressed in TI
training, but rath... 阅读全帖 |
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w***m
发帖数: 15 | 5 A 4.5+ player should definitely be able to handle a 100 mph 1st serve
without much angle or spin. So you can practice serving with angles. Since
it seems like you got pretty good serve, at least very good pace, try to
focus on angle when you practice your serve. Try to serve with less power so
that you can control the angle better. Do not try to use 100% of your power
when serving, otherwise you will often lose your balance and cannot move
well if your opponent returns it well.
100+ mph serve is |
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w******n
发帖数: 13172 | 6 太慢的angle球，碰到高手死的更快，你主动给对方angle。碰到能跑control又好的人
，一个战术就是死打中间，压深，不给对方angle to work with。打双打的时候这个更
明显。你打angel，对方回个angle更大的回来。 |
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w******n
发帖数: 13172 | 7 你这个答案似是而非。你打angle，对方其实更容易回angle。所以看网球比赛时经常听
评论说“don't give your opponent angle to work with"，就是压中间压深，对方就
很难打出angle来了。
要解释这个问题，必须对着球场的图比划才能说的清。如果简单的讲，就是造成一种状
况，这时对方的high percentage shot大部分都必须落在场地中央，而且基本上都是
either TOWARDS you or within 2-steps reach by you，而你则可以主动的选择落点
而不会大幅降低成功率。这样，你需要的跑动范围就很小，而对方则需要大幅跑动，除
非对手选择打low percentage shot。 |
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z*********n
发帖数: 94654 | 8 给angle条件就是这个angle能让对方亚历山大
或者，你这个angle shot非常重，快
或者，对手很弱，一跑就不行了
一般的angle如果对方能handle得了的确经常会副作用 |
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b*********s
发帖数: 6757 | 9 this is a high ball.... were you late on this one? The angle isn't the best
to tell if you had a good contact or not, but from this angle I thought you
should have hit that ball already. lol
also not very clear because of the angle. By looking at it from this angle,
I would suggest to bring the racquet a tick closer to the body at the prep
phase, when you do, your right elbow should be slightly bend, this will give
you a bit more shoulder turn, and helps with racquet drop. |
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k**n
发帖数: 351 | 10 when you hit a shot with angle, it is more likely your opponent will return
a shot with angle. Bigger angles means more chance to be a winner or error,
hence less shots of this point. That is not Nadal.
Nadal tries to hit less angle to make the point more shots, hence his
endurance will have a chance to work. |
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D**********e
发帖数: 147 | 11 Aries Horoscope for November 2010
By Susan Miller
This should be a very happy month and a far better one than most you've had
in 2010. Mars has now so far
journeyed to the top of your chart and it is in Sagittarius, a fellow fire
sign like yours. You always do well
when your ruling planet, Mars, is in a fire sign, for he can support you in
a much more wholehearted way,
and you're sure to feel the results.
Lots of options will be presented now, and if you work in the media or hope
for publicity f... 阅读全帖 |
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S*****i
发帖数: 2031 | 12 By Susan Miller
You are now in the process of renewing your life from the bottom up and
from
the inside out, due to a series of eclipses that have come by in
Sagittarius and Gemini since they started a year ago, on December 21,
2010 (
Sagittarius). Three more eclipses have come by since then, on June 1
(Gemini
), June 15 (Sagittarius), and just last month, on November 25
(Sagittarius).
The next is due on December 10, 2011 (Gemini). All these eclipses will
be
linked to each other in some way - it... 阅读全帖 |
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t***y
发帖数: 182 | 13 英文原文对照：
It can be maddening when the planets send mixed messages. This has been
going on since last month, so it is no wonder you may feel anxious and on
the horns of a dilemma, unable to see the road ahead clearly. On one hand
the eclipse season is upon us, and eclipses push us hard to step with the
times and to fix any weaknesses that these lunar and solar events uncover.
They certainly make us attend to things with a sense of urgency.
On the other hand, Mercury is retrograde, and will remain ... 阅读全帖 |
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t***y
发帖数: 182 | 14 source:
http://astrologyzone.com/forecasts/monthly/libra_full.php
This month has lots of news on just about every front, so you certainly will
be busy! Home, family, career, money, and plenty of romance could well make
January one of your favorite and most productive months of the year.
First on your agenda will be to take care of home and family-related
concerns. Perhaps the recent holidays have made you realize that your home
is important and deserves attention too. Life isn't just about caree... 阅读全帖 |
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t***y
发帖数: 182 | 15 source:
http://astrologyzone.com/forecasts/monthly/taurus_full.php
It's January and you are thinking of taking a vacation now that the year-end
holidays are over. That sounds so funny, but I am serious. The holidays can
be strenuous, and with four loving heavenly bodies - last week's new moon,
Sun, Pluto, and Mercury - acting like little friends who want you to enjoy a
new setting, consider flying away to a mountainous spot that will give you
the change you crave.
If you can, it would be a great... 阅读全帖 |
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t***y
发帖数: 182 | 16 source:
http://www.astrologyzone.com/forecasts/monthly/scorpio_full.php
Scorpio Horoscope for March 2012
By Susan Miller
You have come to one of the year's most divine moments, the first third of
March. The planets have planned a little party, and invited are Venus,
Jupiter, Mars, and Pluto. The Sun and new moon, March 8, will be on hand to
meet these dignitaries, and together they will bring a lyrical environment
to use in many ways. This period will likely outshine any you've seen lately
. Tog... 阅读全帖 |
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t***y
发帖数: 182 | 17 source:
http://www.astrologyzone.com/forecasts/monthly/scorpio_full.php
Scorpio Horoscope for March 2012
By Susan Miller
You have come to one of the year's most divine moments, the first third of
March. The planets have planned a little party, and invited are Venus,
Jupiter, Mars, and Pluto. The Sun and new moon, March 8, will be on hand to
meet these dignitaries, and together they will bring a lyrical environment
to use in many ways. This period will likely outshine any you've seen lately
. Tog... 阅读全帖 |
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M*******s
发帖数: 2630 | 18 http://www.astrologyzone.com/forecasts/monthly/capricorn_full.p
Capricorn Horoscope for December 2012
By Susan Miller
This will be an exciting, busy time for you, as you still have Mars, the
action planet, in Capricorn, giving you enormous favor. We all love having
Mars in our sign, because as the ancient astrologers used to say, when you
have Mars moving through your own sign, you have energy, drive, and courage.
You'll fiercely defend any proposal you have to show, and because you will
not be ... 阅读全帖 |
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a****8
发帖数: 2771 | 19 来自: 日不落的歌声 2013-12-03 05:43:27
试着翻一翻，大家不要见笑哈~
12月2日的新月对你十分友好，可能会为你带来好消息。随时准备好你的行李箱，亲爱
的橙子们，因为你有可能来次说走就走的旅行。大多数人会在这时候去度假，但是这个
月你可能不会随大流而早早的回家去，因此在年底人们奔向机场的时候，你已经回到家
享受好时光了。
12月17日的满月强调了这次出行，但是如果你出门，你将去一个遥远的城市。满月带来
结论和结果，因此你有可能在12月21日前就回家（加减四日）。这是计划活动的好时机
，因为12月底将有困难出现，尤其体现在出行方面，所以请保持明智--如果你想出发，
那么尽早为好。我将在困难来之前做详尽的解释，所以现在我们就把注意力集中在这次
美妙的新月上吧。
在月初，请留意你的兄弟姐妹，因为他们可能为你带来振奋人心的消息，效果可能尤为
惊喜（如果你没有兄弟姐妹，那有可能是堂兄弟姐妹或者其他近亲）
提到这些消息，本月前两周你可能忙得不可开交：接电话，发邮件，开会。。。但是节
奏会在第三周慢下来。你也许要写作业，做商业计划，预约或准备演讲，或者开放网站
和博客，又或者忙着... 阅读全帖 |
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a****8
发帖数: 2771 | 20 来自: 457605220 2014-03-02 14:06:25
Susan Miller 2014年3月射手座运势
转载请注明“susanmiller小组”及译者姓名，谢谢！
译者：457605220
来自：susanmiller小组（http://www.douban.com/group/susanmiller/）
三月将是处理家庭相关计划的理想月份.想搬家,找新的地方,三月开始吧.新月在美国西
海岸28日23点59分出现,其他大多数时区都是3月1日出现.预示着月初有许多新鲜的能量
给你带来机会,其中许多是你解决家庭相关难题的绝佳机会.
由于新月出现时力量最强,之后每天逐步衰减,所以新月时做事要迅速,没时间供你浪费.
到3月13左右,新月把指挥棒移交给满月.(满月16号发生,影响大约持续4天左右)
可以选一个承包商翻新你家厨房,修修窗户或屋顶,准备为夏天租一个很赞的海滨小别墅
,规划你家庭院春天的景观-你会有很多选项,且能定下来.这次新月很独特的是掌管艺术
的海王星也同时出现,提供你许多艺术选项.释放你的艺术潜能吧.逛逛画店,挑几只画笔
,或者去家具店和装饰店买点布样.你的设计才... 阅读全帖 |
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c*****g
发帖数: 41 | 21 第一颗：钻石上有GIA编号的laser标刻，rapapot估价为$3920, 现在价格为 $ 4043
ROUND BRILLIANT
Measurements: 5.93 - 5.99 x 3.69 mm
Carat Weight: 0.80 carat
Color Grade: F
Clarity Grade: VS2
Cut Grade: Excellent
PROPORTIONS:
Depth: 61.9%
Table: 57%
Crown Angle: 34.0°
Crown Height: 14.5%
Pavilion Angle: 41.0°
Pavilion Depth: 43.5%
Star length: 50%
Lower Half: 80%
Girdle: Medium to Slightly Thick, Faceted
Culet: None
FINISH:
Polish: Excellent
Symmetry: Excellent
Fluorescence... 阅读全帖 |
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v*********n
发帖数: 3983 | 22 第一个：
ROUND BRILLIANT
Measurements: 5.93 - 5.99 x 3.69 mm
Carat Weight: 0.80 carat
Color Grade: F
Clarity Grade: VS2
Cut Grade: Excellent
PROPORTIONS:
Depth: 61.9%
Table: 57%
Crown Angle: 34.0°
Crown Height: 14.5%
Pavilion Angle: 41.0°
Pavilion Depth: 43.5%
Star length: 50%
Lower Half: 80%
Girdle: Medium to Slightly Thick, Faceted
Culet: None
FINISH:
Polish: Excellent
Symmetry: Excellent
Fluorescence: Faint
CLARITY CHARACTERISTICS:
Twinning Wi... 阅读全帖 |
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b*s
发帖数: 82482 | 23 比较一下词条的详细程度：
torpedo:
torpedo, n.
View as:
Outline |
Full entry
Quotations:
Show all |
Hide all
Pronunciation: /tpid/
Forms: Also 15 -ido. Pl. torpedoes.
Etymology: < Latin torpēdo stiffness, numbness, also the cramp-fish or
electric ray, < torpēre to be stiff or numb; = Spanish torpedo, Portuguese
torpedo, Italian torpedine. Compare French torpille, Italian torpiglia from
the same verb.(Show Less)
1.
Thesaurus
Categories
a. A flat fish of the genus Torpedo or family Torpedini... 阅读全帖 |
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b*s
发帖数: 82482 | 24 来自主题: LeisureTime版 - 等着某一天 The use of the parsec as a unit of distance follows naturally from Bessel's
method, since distance in parsecs can be computed simply as the reciprocal
of the parallax angle in arcseconds (i.e. if the parallax angle is 1
arcsecond, the object is 1 pc distant from the sun; If the parallax angle is
0.5 arcsecond, the object is 2 pc distant; etc.). No trigonometric
functions are required in this relationship because the very small angles
involved mean that the approximate solution of the skinny tria... 阅读全帖 |
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wh
发帖数: 141625 | 25 他的基调是不是都比较sad？
我想起以前版上的upupupu写过几米，刚刚找出来看，也有不少sad的画，不过upupupu
看重的是积极的闪光。
发信人: upupupu (天天向上), 信区: LeisureTime
标 题: 【征文】用画笔写作的安徒生 -- 几米
发信站: BBS 未名空间站 (Thu Dec 10 14:15:43 2009, 美东)
几米真名叫廖福彬，英文名Jimmy Cai，1958年生，创作出书已有十年了吧.
他从台湾文化大学美术系毕业，在广告公司干了十二年，他没有野心，小兵一个。三十
多岁有了中年危机，觉得不能只给人打工，想要有更多时间创作自己的东西，于是毅然
辞职，做了个自由职业者，在家专心画画。从此他一发而不可收，提起画笔如版上大牛
们灌水一样，文思泉涌，十年来成书三十多部，编剧一部，可谓多产插画家了。
现代人生活节奏紧张，读书对很多人已数奢侈。而且整天读Email，SMS，人们恨不能以
最快的速度看完一篇文章，然后干别的。其实这也很正常，现代社会逼着人们快速消化
信息，马上做出反应。 人们已经越来越没了耐心，现在再看戏剧，觉得慢的无法忍受
，再看... 阅读全帖 |
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z***i
发帖数: 1122 | 26 刚刚发现Winogrand专门考虑过这个问题,他觉得他看到的是21mm,但离近了实在变形太
大,
所以才用了28mm:
Winogrand: Ideally, I wish I had a lens that took in my whole angle of
vision, without mechanical distortion – that’s the headache with these
things. Ideally, that would probably be the most interesting to work with.
The 28 is probably where the mechanical distortion is least limiting – much
less limiting than a 21. It’s closest to the angle of attention. It’s
pretty close to at least my angle of attention. Probably the 21 is more so,
b... 阅读全帖 |
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z***i
发帖数: 1122 | 27 是，我的理解是这个歪解决了两个问题：眼平视点高，广角变形。
John Szarkowski专门讲过这个：
“IN THE STREET PICTURES of the early sixties Winogrand began to develop two
pictorial strategies that he found suggested in certain pictures in Frank's
The Americans. The first of these related to unexplored possibilities of
the wide-angle lens on the hand camera. The conventional conception of the
wide-angle lens saw it as a tool that included more of the potential subject
from a given vantage point; most photographers would not use it unless... 阅读全帖 |
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r*****l
发帖数: 2859 | 28 贴出来给以前没见过的人。有包子吗？
$400 off Nikon 70-200mm f/2.8G ED VR II AF-S Nikkor Zoom Lens. Enter code
TO4DXKTZ at checkout.
$400 off Nikon 14-24mm f/2.8G ED AF-S Nikkor Wide Angle Zoom Lens. Enter
code EOP26EJJ at checkout.
$300 off Nikon 28-300mm f/3.5-5.6G ED VR AF-S Nikkor Zoom Lens. Enter code
YR2K5948 at checkout.
$300 off Nikon 24-120mm f/4G ED VR AF-S NIKKOR Lens. Enter code 8EZ6KQJW at
checkout.
$300 off Nikon 16-35mm f/4G ED VR II AF-S IF SWM Nikkor Wide Angle Zoom Lens
. Enter code DAJGOFSD at c... 阅读全帖 |
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o*******n
发帖数: 43 | 29 http://www.amazon.com/exec/obidos/tg/feature/-/1000637791?tag=d
Instant Savings Amount by Lens
$400 off Nikon 70-200mm f/2.8G ED VR II AF-S Nikkor zoom lens. Enter code
YBLMIZW6 at checkout.
$400 off Nikon 14-24mm f/2.8G ED AF-S Nikkor wide-angle zoom lens. Enter
code GDZ8CO3V at checkout.
$300 off Nikon 28-300mm f/3.5-5.6G ED VR AF-S Nikkor zoom lens. Enter code
8S6HXIHY at checkout.
$300 off Nikon 24-120mm f/4G ED VR AF-S NIKKOR lens. Enter code J2QGDJQI at
checkout.
$300 off Nikon 16-35mm f/4... 阅读全帖 |
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Y****0
发帖数: 91 | 30 其实刚才有几位已经解答过了。
see wiki： http://en.wikipedia.org/wiki/Normal_lens
In photography and cinematography a normal lens is a lens that reproduces
perspective that generally looks "natural" to a human observer under
normal viewing conditions, as compared with lenses with longer or shorter
focal lengths which produce an expanded or contracted field-of-view.
Lenses of shorter focal length are called wide-angle lenses, while longer
focal length lenses are referred to as long focus lenses[1] (with the
most... 阅读全帖 |
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b*******t
发帖数: 33714 | 31 对用rotary shutter的film camera来说，
shutter speed : 1/fps = shutter angle : 360
这个比例直接控制的是motion blurr
shutter angle太小/shutter speed太快，motion blurr就小，造成你说的跳
shutter angle太大/shutter speed太慢，motion blurr就大，会留下运动轨迹尾巴
rule of thumb是shutter angle在90到180度之间
其中180度对应的就是你说的2倍关系
两个说法是不矛盾的。明白了，多谢。 |
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l******8
发帖数: 9475 | 32 http://www.nikon.com/news/2012/0913_dslr_01.htm
A FX-format camera with a body smallest and lightest among FX-format cameras
that offers excellent basic performance and a 24.3-megapixel image sensor
for superior imaging performance
TOKYO - Nikon Corporation is pleased to announce the release of the Nikon
D600. Despite having the smallest and lightest body among Nikon FX-format
cameras, the D600 offers advanced basic camera performance, and is equipped
with a new FX-format CMOS image sensor with ... 阅读全帖 |
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w********2
发帖数: 632 | 33 http://forum.xitek.com/thread-252610-1-1-1.html
老镜头一直是我所喜好。当中人为的喜好占了决定性因素。没有什么好坏，全凭个人兴
趣。使用多年稍有心得。曾在杂志上断断续续的发过几篇文字。但因个人能力时间有限
无由而止。后得知数处转载，感觉惭愧。现集录如下。供大家指正。
老镜头并非常规使用之利器，当先熟其脾性而后与之。贸然听言非善举！我之文字疏漏
甚多，还望拍砖言讨。
（一）镜之启－Protar
很多年来，在我的镜头群中普罗塔（Protar）镜头是最为常用的一种。记得多年前，我
为自己的一套4×5单轨相机，配备了当时最新款的多只XL级广角与APO镜头。实际拍摄
下来，总感觉与之前用过的哈苏，徕佧镜头在影调和韵味有着很多的差距。虽然功能调
整与清晰度得到了极大的改善，但影像整体的色彩，影调毫无精彩之处，甚至只能用“
夸张”来形容拍摄的影像。就好像是一盘放了大量味精的海鲜饭。人眼所看到的真实感
，在喧嚣的艳丽彩色下荡然无存。环顾市场，当时的目之所及确实没有更好的东西了。
只能接受现实。在遗憾中，还会不时带上Leica 50mm ... 阅读全帖 |
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s******l
发帖数: 1524 | 34 只要定义补角就行了,国内中学没有专门的邻补角定义吧?而且用那么个奇怪的词linear
pairs,只要定义supplemental angles,邻补角用adjacent supplemental angles不就
行了(其实课本中inear pairs 的解释就是adjacent supplemental angles),为何要让学生去
死记硬背linear pairs的意思?what's the point of defining "linear pairs"?
。linear pairs就是“邻补角”，而supplemental angles指一般的“补角”。你说的
奇怪的定义多半就是这些吧。我也没在大学以上水平的书籍或文献中见过这些概念，但
不代表它们对初学平面几何的人没用。 |
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H******9
发帖数: 2766 | 35 God-Shaped Hole :
Every point of view has another angle
And every angle has its merit
But all comes down to faith
Thats the way i see it
You can say that love is not divine and
You can say that life is not eternal
"all we have is now"
But i don't believe it
There's a god-shaped hole in all of us
And the restless soul is searching
There's a god-shaped hole in all of us
And it's a void only HE can fill
Does the world seem gray with empty longing
Wearing every shade of cynical
And do you ever feel ... 阅读全帖 |
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B*******a
发帖数: 801 | 36 【 以下文字转载自 Fashion 讨论区 】
发信人: cowling (住15楼样的牛牛), 信区: Fashion
标 题: 两颗钻石，选哪颗比较好啊？（借这里的人气再发一贴）
发信站: BBS 未名空间站 (Thu Apr 7 11:12:12 2011, 美东)
第一颗：钻石上有GIA编号的laser标刻，rapapot估价为$3920, 现在价格为 $ 4043
ROUND BRILLIANT
Measurements: 5.93 - 5.99 x 3.69 mm
Carat Weight: 0.80 carat
Color Grade: F
Clarity Grade: VS2
Cut Grade: Excellent
PROPORTIONS:
Depth: 61.9%
Table: 57%
Crown Angle: 34.0°
Crown Height: 14.5%
Pavilion Angle: 41.0°
Pavilion Depth: 43.5%
Star length: 50%
Lowe... 阅读全帖 |
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l*******G
发帖数: 1191 | 37 anglev=3000*2*pi/60.0 %angular velocity rad/sec
dt=2*pi/anglev/600; %T/600
t=(0:dt:60); %sec %one minute total
v=25; %mm/sec
xo=0+v*t; %center of rotation
yo=xo*0;
R=10 ; %10mm away from xo, yo
angle=0+t*anglev; %angle relative to x axis
xc=xo+R*cos(angle); %center of cirlcle
yc=yo+R*sin(mod(angle,2*pi));
%draw the circle
r=5; %5mm circle
angc=(0:0.1:2*pi);
for i=1:length(t)
x=xc(i)+cos(angc)*r; %circle
y=yc(i)+s... 阅读全帖 |
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B**I
发帖数: 601 | 38 In triangle ABC, Angle B is 120 degree, segment AF, BD and CE are angle
bisectors of angle A, B and C, and segment AF, BD and CE intercept segment
BC, AC and AB at point F, D and E. Prove Angle EDF is equal to 90 degree.
Thanks |
|
e**********n
发帖数: 359 | 39 Problem 1.
20 degrees, solution:
1. Find F on EB so that DF // AB.
2. Extend AF to G so that AC = AG, now triangle ABC and triangle CGA are
identical.
3. Extend GE to H on DC. It’s easy to see that the angle HEA = 30 degrees.
4. Next is to show angle HED = 10 degrees, which is done by noticing the
triangle HEF is equilateral, and the triangle DEF is isosceles.
5. x = angle HEA - angle HED = 20 degrees.
Problem 2.
30 degrees, solution:
1. Find F on DC so that FE // AB, FB intersect AE at G, a |
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f*****e
发帖数: 2992 | 40 对你的证明做了一点修改,主要思想还是你的.
divide the plane into six angular othants in degree (0, 60),(60,120),(120,18
0),(180,240), (240,300),(300,360)
and we can always eliminate two vectors in the same angle or oposite angles
by + or - and get a vector with no larger length, for example:
if a1,a2 are in the same angle, say, (0,60), then according to laws of cosin
e: |a1-a2|=sqrt(|a1|^2+|a2|^2-2*cos(a1,a2)*|a1|*|a2|)<=max(|a1|,|a2|).
if a1,a2 are in oposite angles, say (0,60), (180,240), then |a1+a2| <= max(|
a1| |
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W**********E
发帖数: 242 | 41 做一个项目时候，需要考虑到两个向量相似的问题。比如vector1=（a1,a2,a3），
vector2=(b1,b2,b3).
如何衡量两者相似度？ 我考虑过两向量的角度-ANGLE，但是特殊的是如果vector2=(-k
)*vector1，那么我也要认为它们是very similar. 可是两者之间的ANGLE是180度,很大
了。所以ANGLE也不是完全能解决问题。
Euclidian distance也不行，比ANGLE更不如。 谁知道更好衡量不同向量相似度的一个
指标？
但凡有好的建议就有10个伪币答谢。 |
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b***k
发帖数: 2673 | 42 ☆─────────────────────────────────────☆
Flyinglan (flying) 于 (Mon Oct 1 22:22:31 2007) 提到:
三个RV X Y Z, X和Y的correlation是0.5， Y和Z的correlation是0.6，请问X跟Z的cor
relation的最小值？
个人感觉好像是个三角形之和等与180度，可能不对。
☆─────────────────────────────────────☆
robustzgy (浪迹天涯) 于 (Mon Oct 1 22:33:54 2007) 提到:
correlation is the cosine of the angle between two variables
angle 1 = arccos 0.5 = 60
angle 2 = arccos 0.6
so min(corr(x,z)) = cos (60+angle 2)
cor
☆─────────────────────────────────────☆
Flyinglan (f |
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P*******l
发帖数: 4895 | 43 发信人: thlj (谈婚论嫁), 信区: wedding
标 题: Re: 钻石选择攻略 (ZT)
发信站: BBS 未名空间站 (Fri Apr 23 16:17:13 2010, 美东)
Depth: 62.6% 可能太大了
Crown Angle: 35.0°
Crown Height: 15.5%
Pavilion Angle: 41.2°
Pavilion Depth: 43.5%
如果你在
http://www.pricescope.com/cutadviser.asp
把Crown Angle改成34，或者把Crown Height改成15% ，或者把Pavilion Angle改成40.
8，或者把Pavilion Depth改成43.0，只用改一样，其他完全一样，就马上变成
excellent了。可见根据它的计算方法，它认为你的钻石的上部或者下部稍微长了点，
导致光线不能完全反射回来。但是这么小的角度差别真的有那么大的区别吗？我不是光
学专家，也不是珠宝专家，就不清楚了。
切磨太深：（俗称“烟囱”）光线易从亭部逸出导致钻石的亮度受损而变得黯淡。
切磨太浅：（... 阅读全帖 |
|
P*******l
发帖数: 4895 | 44 发信人: thlj (谈婚论嫁), 信区: wedding
标 题: Re: 钻石选择攻略 (ZT)
发信站: BBS 未名空间站 (Fri Apr 23 16:17:13 2010, 美东)
Depth: 62.6% 可能太大了
Crown Angle: 35.0°
Crown Height: 15.5%
Pavilion Angle: 41.2°
Pavilion Depth: 43.5%
如果你在
http://www.pricescope.com/cutadviser.asp
把Crown Angle改成34，或者把Crown Height改成15% ，或者把Pavilion Angle改成40.
8，或者把Pavilion Depth改成43.0，只用改一样，其他完全一样，就马上变成
excellent了。可见根据它的计算方法，它认为你的钻石的上部或者下部稍微长了点，
导致光线不能完全反射回来。但是这么小的角度差别真的有那么大的区别吗？我不是光
学专家，也不是珠宝专家，就不清楚了。
切磨太深：（俗称“烟囱”）光线易从亭部逸出导致钻石的亮度受损而变得黯淡。
切磨太浅：（... 阅读全帖 |
|
c*****g
发帖数: 41 | 45 第一颗：钻石上有GIA编号的laser标刻，rapapot估价为$3920, 现在价格为 $ 4043
ROUND BRILLIANT
Measurements: 5.93 - 5.99 x 3.69 mm
Carat Weight: 0.80 carat
Color Grade: F
Clarity Grade: VS2
Cut Grade: Excellent
PROPORTIONS:
Depth: 61.9%
Table: 57%
Crown Angle: 34.0°
Crown Height: 14.5%
Pavilion Angle: 41.0°
Pavilion Depth: 43.5%
Star length: 50%
Lower Half: 80%
Girdle: Medium to Slightly Thick, Faceted
Culet: None
FINISH:
Polish: Excellent
Symmetry: Excellent
Fluorescence... 阅读全帖 |
|
Y*******1
发帖数: 37 | 46 3款，前两款是预算内的为数不多的HCA小于2的
现在举棋不定，大家给个建议吧。
第一款，稍贵600刀，还小一些；
第二款，Girdle是不是稍微粗些，重量都跑到腰上去了？
第三款，HCA大于2。唉，女人啊，没办法。
(1)
0.90 F VVS1
HCA SCORE: 1.7 EXCELLENT $12,200
Total depth %: 61
Table %: 58
Crown Angle: 35
Pavillion Angle: 40.8
Culet: 0
(2) 0.94 G VVS1
HCA SCORE: 1.8 EXCELLENT $11,500
Total depth %: 61.9
Table %: 56
Crown Angle: 35.1
Pavillion Angle: 40.8
Culet: 0
medium to slight thick
(3) 0.92 F, VVS2
HCA 3 VERY GOOD $11,600
thin to slight thick |
|
x*****y
发帖数: 118 | 47 来自主题: WeddingBells版 - 帮忙挑钻戒 1.05 H VS1
Precision of Cut Excellent
Symmetry Excellent
Polish Excellent
Total Depth 59.8%
Table Size 60%
Crown Height 13.4%
Crown Angle 33.4
Pavilion Angle 40.6
.95 G VVS1
Precision of Cut Excellent
Symmetry Excellent
Polish Excellent
Total Depth 61.7%
Table Size 56%
Crown Height 15%
Crown Angle 34.6
Pavilion Angle 40.9 |
|
w***n
发帖数: 9040 | 48 俺也可以趴趴墙了，嘿嘿。
The M6 Treadwall is based on 20 years of design and research into the
rotating climbing wall. The newest incarnation of our original product has
every feature that we could stuff in, including legendary durability. For
fun, and for serious training, the past two decades has seen the treadwall
put to multiple uses throughout the world.
Cross training in particular has never been easier, lower the M6 to the full
-12 degree angle and work all the muscles in your arms shoulders and core... 阅读全帖 |
|
f*******r
发帖数: 5301 | 49
,
说到硬指标，三个angle里的最小值最有意义(就算你有90度的approach angle，能开过
楼房么)
FJ Cruiser的breakover angle超过27度，是各种原厂车里最牛的
Rubicon应该算改装车，breakover angle还不如原装的FJ Cruiser
不过这些指标简单换换bumper,轮胎之类的就可以大幅度提高,是个车都能很牛
到最后根本还是要看frame, 看发动机变速箱，都是改不了的东西，为什么说LC80牛，
就是因为底子好，烂路上轰轰轰的糟蹋几十万公里没问题
GX
，但
可以 |
|
