M******8
发帖数: 10589 | 1 It Doesn't Matter if Ecuador Can Afford This Dam. China Still Gets Paid.
NICHOLAS CASEY, CLIFFORD KRAUSS
2018年12月26日
Federico Rios Escobar for The New York Times
REVENTADOR, Ecuador — The dam sits under the glare of an active volcano,
with columns of ash spewing toward the sky.
厄瓜多尔雷文塔多火山——大坝坐落在一座活火山下，缕缕火山灰喷入天空。
Officials had warned against the dam for decades. Geologists said an
earthquake could wipe it away.
数十年来，官员们一直对这座大坝发出警告。地质学家表示，一场地震就能将其抹去。
大坝附近的雷文塔多火山在喷发火山灰。
大坝附近的雷文塔多火山在喷发火山灰。 Federico ... 阅读全帖 |
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x*****8
发帖数: 10683 | 2 大学普通化学美女学生问我：
1） 既然一个周期从左到右，第一电离能升高，那为什么O的第一电离能却比N的第一电
离能低？
我告诉她，这是一个经典例外。你只要画出O和N的orbital diagram就知道了。
O
1s2 2s2 2p4
N
1s2 2s2 2p3
N的2p三个电子轨道都是半满，更加稳定，所以第一电离能反而高，而O的2px电子轨道
中2个电子之间有排斥力，要失去一个电子才能变稳定，所以第一电离能反而低。
她将信将疑。
然后我告诉她，用Molecular Orbital（MO)理论也可以得到相同结果。她摇头说：老师
说书上的MO不考，所以老师只讲了5分钟，我根本不知道他在讲什么。
然后她问我：
2） 既然一个族从上到下，原子半径增大，那为什么Ga的原子半径却比Al的原子半径略
小？
我又告诉她，这是一个经典例外。你看看，Al原子核有13个质子正电荷，而在Ga之前周
期表中插入了3d轨道10个电子，原子核有31个质子正电荷，Ga核吸引力比Al核吸引力大
得多，所以Ga的原子半径反而小于Al。
她皱起了眉头说：“我老师说原子半径变化趋势主要看shielding effect。我... 阅读全帖 |
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b*******k
发帖数: 1761 | 3 # Lacrosse 1: "Lacrosse 3000"
* Launch: December 2, 1988
* Platform: Space Shuttle Atlantis, mission STS-27
* Pad: Kennedy Space Center, Launch Complex 39B
* Orbital apogee/perigee/inclination: 447 × 437 km @ 57.0°
* Orbital period: 93.4 minutes
* Decay: 1997
* Status: Fulfilled mission, deorbited.
* NORAD Number: 19671(USA 34) COSPAR ID: 1988-106B
这是WIKI上长曲棍球1的数据，轨道周期只有1个半小时。一艘船一个半小时也就是4，
50海里，完全有可能监控住。至少可以作为初步判断的依据。 |
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h****1
发帖数: 1242 | 4 http://physicsworld.com/cws/article/news/47750
Russia's first interplanetary mission in over 15 years has failed after
launch due to an engine mishap that prevented the unmanned spacecraft from
being sent on its proper course toward Mars. The craft – dubbed Phobos-
Grunt – is now trapped in orbit around Earth with engineers having around
three days to save the craft before its batteries run out.
Phobos-Grunt, costing $163m, is a Russian Space Agency mission that was
designed to travel to Mars' m... 阅读全帖 |
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d********e
发帖数: 2221 | 5 I'm not 100% sure but 90% sure. this kind of thing usually does "push broom
" scanning. each scan line is usually perpendicular to the orbital
direction. each scan line is spread in the orbital direction and projected
to to a 2-D sensor array. It does not make sense to have only a few
wavelengths because there is already a 2-D sensor array.
http://en.wikipedia.org/wiki/Hyperspectral_imaging |
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Z**R
发帖数: 1233 | 7 http://lroc.sese.asu.edu/news/index.php?/archives/849-Change-3-
Chang'e 3 landed on Mare Imbrium (Sea of Rains) just east of a 450 m
diameter impact crater on 14 December 2013. Soon after landing, a small
rover named Yutu (or Jade Rabbit in English) was deployed and took its first
tentative drive onto the airless regolith. At the time of the landing LRO's
orbit was far from the landing site so images of the landing were not
possible. Ten days later on 24 December, LRO approached the landing site... 阅读全帖 |
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a***s
发帖数: 1084 | 8 http://www.nbcnews.com/science/space/mysterious-x-37b-space-pla
No one seems to know much about the Air Force's X-37B secret space plane
except that it appears to be working exactly as designed. The unmanned
Boeing-built craft, which resembles a miniature space shuttle, returned to
Earth on Friday after nearly two years — 674 days, to be exact — in space.
It's the X-37B program's third mission to space and by far the longest.
The plane landed at 9:24 a.m. local time on Oct. 17 at Vandenberg Air ... 阅读全帖 |
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f*******e
发帖数: 1061 | 9 http://time.com/4572079/best-inventions-2016/
When China’s newest astronauts, Jing Haipeng and Chen Dong, arrived in
orbit earlier this year, they docked at some impressive digs. Specifically:
the orbital laboratory Tiangong-2 (Heavenly Palace 2), which is more than 34
ft. long and nearly 14 ft. wide and includes an exercise area and a medical
-experiment bay. Yes, that’s all modest compared with the multimodule
International Space Station (ISS), which is roughly the size of a football
fie... 阅读全帖 |
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B*V
发帖数: 3365 | 10 【 以下文字转载自 Headline 讨论区 】
发信人: zongheimun (feifei), 信区: Headline
标 题: Next Friday, a 130,000 ton asteroid is set to pass perilously close
to earth.
发信站: BBS 未名空间站 (Sat Feb 9 14:03:20 2013, 美东)
National Aeronautics and Space Administration experts who plotted its
trajectory are confident that the primordial rock, weighing an estimated 130
,000 metric tons, will pass within "a remarkably close distance" of Earth,
nearer than many orbiting communications satellites but far enough away to
safely spee... 阅读全帖 |
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T*****n
发帖数: 2456 | 11 Apollo Landing Sites Revisited
http://www.nasa.gov/mission_pages/apollo/revisited/#.UrFAatI3u7
Images taken by the Lunar Reconnaissance Orbiter mission beginning in July
2009 show the six Apollo Lunar Module descent stages, Apollo Lunar Surface
Experiment Package (ALSEP) science experiments, astronaut footpaths, and
lunar rover tire tracks. These images are the most effective proof to date
to rebut the "landing hoax" theories. Although this probe was indeed
launched by NASA, the camera and the i... 阅读全帖 |
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T**********e
发帖数: 29576 | 12 最后一张照片。这红涂漆太阳光直照不久就脱色了吧。
Last pic of Starman in Roadster on its journey to Mars orbit and then the
Asteroid Belt
Third burn successful. Exceeded Mars orbit and kept going to the Asteroid
Belt. |
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j*****8
发帖数: 3635 | 13 带了2个car seat，一个是orbit g2 infant， 一个是orbit g2 toddler。 ml350放在
第二排只能并着放，不能一边一个。并着放也很紧凑。gl450也一样，第二排和ml350差
不多，可能稍微宽那么一点点，但感觉一样。所以我们觉得3个大人加两个小孩的话，
gl450相对ml350来说没啥明显的优势
本来打算如果2个car seat都放进去没问题，就买的。发现不行，郁闷之余就去看了
odyssey。空间果然大很多，第二排一边一个car seat，然后从中间走过第三排很方便。
于是，一直坚定不买minivan的领导开始纠结了。。 |
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发帖数: 1 | 14 从太空传回的海量数据谁来分析？
詹姆斯·克劳福德的办公室和谷歌公司一样，位于硅谷的山景城。三年前，詹姆斯创办
了这家名为Orbital Insight的公司，依靠人工智能方法发掘从太空传回地球的各种数
据，得到有效信息帮助人们决策。
Orbital Insight公司创始人詹姆斯·克劳福德：如果仅靠人工观察提取信息，比如计
算路上的汽车、卡车或火车数量，几年后就需要800万人。所以，我们用机器代替人工
来观察卫星影像。使用深度学习、卷积神经网络等人工智能技术，分析、理解影像内容
，并转换成可用信息。
人工智能观察卫星影像，得到的信息用来干什么？
将卫星和人工智能里的机器学习相联系，对道路、飞机、云、雾、湖泊、土地、建筑物
和油库情况进行测量和分析，能够帮助人们更好地认知世界。詹姆斯的团队还与世界银
行进行了合作，通过建筑物高度和屋顶材质测量数据，来衡量各地的财富情况，从而提
高相关贫困数据的准确度。
人工智能的图像识别有多准确？
詹姆斯·克劳福德：其实很多算法的精度已经达到95-97%，与此同时，我们也在不断新
增识别对象，比如识别道路、建筑或某款汽车。
停车场大数据告... 阅读全帖 |
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r*********s
发帖数: 2157 | 16 Sander不外乎下面几种， 价格都不高
Belt Sander
Random-Orbit Sander
Sheet Palm Sander
Oscillating tool
还有用block手动磨。买个 orbit sander, 边角用手动就好了。 |
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k*z
发帖数: 4704 | 17 刷柜子很简单。
材料：General Finish Java Gel Stain, Water Espresso, Gel Top Coat （
WoodCraft.com)
工具：白布若干包(Wipe Cloth) from HD or Lowes，小棉刷几袋from Habor Freight
，洗碗用的胶皮手套若干from 99Cents，刷漆用的胶布若干卷。
Black and Decker 3in1 Sander(Orbit, Triangle, Square), 配套的Sander Paper 几
包 (120,180,220)，方块的同型号Sander Paper几包。
如果不是很旧或者很脏，可以用Miner Spirit或者Varnish Remover,但是不建议，不好
用，还是Sander 好用。
Bosh的是圆的，又得时候需要三角的，所以买了后退了。买了Black&Decker的3in1.
油漆是从WoodCraft.Com买的。买Gel的好处是可以用白布上漆，没有刷子的痕迹。
水漆特指Espresso Water Based. Gel是Java Gel Stai... 阅读全帖 |
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w*****m
发帖数: 20421 | 18 ZONE肯定没问题的，当初设计的时候多数是一个ZONE一个ZONE的走，
肯定有漏水的地方了，把不好用的SPRINKLER HEADS全换掉，如果
还是顶不起来就可能有地方漏水了，我花了三个月才把系统弄个差不多，
很辛苦的，注意SPRINKLER买RAIN BIRD 1800系列，90度和180度的，
360度可调的其实不好用，不要买ORBIT的，ORBIT的好坏，尤其是水压
有问题的时候，几回就搞坏了 |
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w*****m
发帖数: 20421 | 19 ZONE肯定没问题的，当初设计的时候多数是一个ZONE一个ZONE的走，
肯定有漏水的地方了，把不好用的SPRINKLER HEADS全换掉，如果
还是顶不起来就可能有地方漏水了，我花了三个月才把系统弄个差不多，
很辛苦的，注意SPRINKLER买RAIN BIRD 1800系列，90度和180度的，
360度可调的其实不好用，不要买ORBIT的，ORBIT的好坏，尤其是水压
有问题的时候，几回就搞坏了 |
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a*****0
发帖数: 3319 | 22 oak 橱柜3面墙都有，第四面是个挺大的breakfast bar. researh了一下，有四种选择，
1. Zinsser Smart Prime + Benjamin Moore Advance Paint
2. Nuvo Cabinet Paint
3. Rust-oleum cabinet transformation
4. Sherwin Williams premium wall wood primer + ProClassic enamel paint.
请问哪个选择能产生最好的效果? Do I need to use the rotary orbit sander +
sand block to sand all the cabinets and drawers? I saw it looks like veneer
instead of real oak wood on the side of the breakfast bar. Do I need to use
rotary orbit sander there before painting?
Now the ... 阅读全帖 |
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m**********a
发帖数: 76 | 23 长期在宝宝版潜水，学到不少知识，也来写一写我买stroller的经历吧，价钱基本是用
amazon的来比较。第一次开帖，一家之言, 调查考虑不周之处, 请大家轻拍, 若是补充
改正一下就更好啦。
我在宝宝出生之前买了 chicco key fit 30 travel system，当时挺得意的,觉得配
套的就perfect。用了几个月，出门看到别的妈妈推Britax B ready，顿时觉得Britax
好太多了,娃娃面向自己，位置高,遮阳棚大，于是决心也给宝宝换一个。我的基本要求
是：宝宝可以面向自己，而且可以坐的比较高，容易调换座位方向尽量避免晒到宝宝。
Contours Options 3 Wheel Stroller：这一款是我找到的reversible stroller里面最
便宜的，只要169，且声称大多数carseat都可以和它配套。
Bumbleride Flyer Reversible handle stroller：reversible handle stroller 里最
便宜，250。但它有一个缺点就是座位不能反过来，如果想面对宝宝，只能用
reversib... 阅读全帖 |
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c********e
发帖数: 446 | 24 我们家宝宝十八个月，终极好动，爱玩，不怕生，喜欢新鲜事物。说这些是因为迪斯尼
并不一定适合所有的宝宝。有宝宝会觉得里面太过丰富（overwhelmed），而不适应。
开始正式攻略！（大家还没睡着吧）
一、关于选园。
奥兰多迪斯尼一共有四个园，另外第五个是水上公园（water park），和这四个不属于
一伙。四个园分别是Magic Kingdom（其他国家的迪斯尼就是指这个园，最大的也是这
个园），Epcot，Animal Kingdom， Hollywood。之前我也非常的晕，到底该玩哪个！
如果大家带的是100cm以下的小娃，那么就果断选择Magic Kingdom。其中，Magic
Kingdom里面最适合小娃玩的基本都在Fantasyland。据我的精密计算（此处用到小学三
年级数学，谢谢），只有Magic Kingdom有最多适合任何身高参与的Ride（一直不知道
这到底怎么翻译，请神人指教！）。我们只去了Magic Kingdom，玩足了两天（10:00am
-10:00pm，还是很拼的！）基本上没有身高限制全部玩了。而且，我们是圣诞当天去的
，也就是说如果大家选择淡季去，... 阅读全帖 |
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l*****y
发帖数: 5737 | 26 7/31 Smartsource
Red Lobster $4.00 off any two dinner entree's (9/8)
Red Lobster $3.00 off any two lunch entree's (9/8)
BIC Stationery Products Save $1.00/2 (9/30)
General Mills Cereals Chex*Fiber One*Honey Nut*Oatmeal Crisp*Raisin Nut*
Total (9/10)
Yoplait Greek Yogurt Save $.50/2 (9/24)
Save $1.00 on any fresh eggs when you purchase two packages of Naturesweet
Cherry Tomatoes (10/31)
Welch's Jams Jellies or Spreads Save $1.00/3 (10/31)
Blink Tears or Blink Gel Tears Lubricating Eye Drops Save ... 阅读全帖 |
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D*****a
发帖数: 810 | 27 Free Friday Download (Today, January 1st) only: Free Nature’s Harvest
Sandwich Bread (20-24 oz)
http://kroger.softcoin.com/programs/kroger/freefri_r2/?banner=K
Kroger mega sale: Buy 5, get $5 off at checkout (now - 1/12)
Green Giant Sautes or Fire Roasted Vegetables (10-12 oz) – $1.99 (wyb 5
participating items)
Use $1/1 Green Giant Sautés OR Green Giant Fire Roasted frozen vegetables
printable
Final price: $0.99
Catalina offer for Post Cereal (including Grape Nuts, Shredded Wheats,
Raisin ... 阅读全帖 |
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D*****a
发帖数: 810 | 28 CVS (2/21 -2/27):
Free Dark Chocolate YORK Peppermint Pattie (1.4oz. only), SavingStar.com
rebate, expire 2/23
Cadbury Egg (1.2 oz) or or Mini Eggs 1.5 oz, Hershey’s Egg or Bunny Ears 0.
95-1.55 oz - $0.99
Pay $0.99, get $0.99 ECB (limit 1)
Final Price: Free
Physician’s Formula Shimmer Strips All-In-1 Nude Palette - $13.99
Pay $13.99, get $8 ECB for buying $12 (limit 1)
Submit for $10 Physician’s Formula Mail-In Rebate
(一定要买贴有rebate peelie/rebate label 的包装)
Final Pric... 阅读全帖 |
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c******x
发帖数: 67 | 29 该课题组今年年初招了两个博士后，现在准备再招两人。需要有第一性原理、量子化学
或相关领域的编程经验。
We seek two additional Postdocs. The Dept. of Energy has funded our project
on orbital-free free-energy density functional theory for warm dense matter
and we are underway.
详情见
http://www.qtp.ufl.edu/~trickey/
一点背景：
QTP做理论的牛人聚集
项目负责人之一Trickey是Wien2k程序的早期作者之一
一点建议：
orbital-free DFT和warm dense matter都是新兴热门领域，申请前先读一些相关文献。
准备好电话面试，国内申请人也可能通过视频面试。 |
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m***e
发帖数: 810 | 30 Boeing and SpaceX get NASA contracts to take astronauts to the ISS
Boeing and SpaceX have received contracts to develop a new fleet of American
spacecraft for NASA. The companies will spend the coming three years and $6
.8 billion ($4.2 billion for Boeing and $2.6 billion for SpaceX) in funding
from the agency working towards certifying their ships to carry astronauts
to the International Space Station, a goal they're expected to hit in 2017.
Boeing will work with its CST-100 capsule, while Spac... 阅读全帖 |
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g****t
发帖数: 31659 | 31 三次点火成功。Musk的twitter有图。
But now it seems that engine ignition worked a little too well. SpaceX CEO
Musk tweeted out a map of the Roadster’s final orbit after the burn,
showing just how far out the car will travel. And it looks like it’s going
so far into the asteroid belt that it will get relatively close to the orbit
of the dwarf planet Ceres. |
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h********r
发帖数: 802 | 32 u r right, 2. Flashes move around asu tempe campus.
BTW, I remember that there was a survey about the charge of orbits. Maybe
orbits will be charged some time in the future. |
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G******t
发帖数: 90 | 33 【 以下文字转载自 Military 讨论区 】
发信人: wsnonline (卫所南次郎-子曰：“再得瑟我削你啊！”), 信区: Military
标 题: 中国批印度火星计划，三哥网民激动回复
发信站: BBS 未名空间站 (Fri Nov 8 22:27:15 2013, 美东)
文章提交者：忙碌一天 加贴在 陆军论坛 铁血论坛 http://bbs.tiexue.net/bbs32-0-1.html
印度抢先中国一步，成功向火星发射探测器，随后北京呼吁“共同努力”以确保外太空
和平。11月5日下午，火箭搭载着“曼加里安”号飞行器升空，使得印度成为排在美国
、俄罗斯和欧洲之后第四个向火星发射探测器的国家。预计明年9月进入红色星球的轨
道。“外太空是全人类的共同财富，各国拥有和平探索和利用外太空的权利。”中国外
交部发言人洪磊在新闻发布会上被问及如何看待印度探测火星时说。同时，他表示国际
社会应共同努力，维护外太空的永久和平与可持续发展。
外文标题：China calls for 'joint efforts' after India's Mars mission
[ 转自铁... 阅读全帖 |
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s****g
发帖数: 1028 | 34 If that is the case, I can give you a few tips.
First open all the wood and let them spead inside for a while, reason is for
the wood to get used to your home's temperature and humidity. Wood will
swell or shrink when humidity or temperature change.
Second, if you are not used to the sander, rent a random orbit version
instead of drum sander. Random orbit sander is a lot easier to master than
the drum sander. Practice first with fine sander paper until you get the
hang of the machine.
Wood condi... 阅读全帖 |
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W********m
发帖数: 7793 | 37 好久不逛2+2 了， 昨天去看到个有意思的。大家怎么看？call, fold?
====================
Some background info first:
it's a live 10/20 nlhe game with no cap. table is deep. I just say down
about 2 orbits ago with 13k and haven't played a single hand yet.
Villan in this hand is unknown and hasn't played in the past town orbits
either and he has about the same stack.
Hero: KsKh and raises to 80
Villan: calls 80
4 more guys call.
Flop ($480): KdQcQh
Hero: bets $120
Villan quickly calls $120
Everyone else folds
Turn($720): Td
... 阅读全帖 |
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D**********e
发帖数: 147 | 38 先贴蝎子的吧
Scorpio Horoscope for November 2010
By Susan Miller
What a glorious month lies ahead! Of all the months of 2010, November will
be the sweetest. How
wonderful that birthday month will be so rare and special for you. The Sun,
Mercury, and Venus have by
now moved into Scorpio, and with such loving planets behind you, you will
feel confident and determined to
succeed. The Sun will add to your presence and demeanor of authority,
Mercury will sharpen your ability to
articulate ideas, the new mo... 阅读全帖 |
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t***y
发帖数: 182 | 39 source:
http://astrologyzone.com/forecasts/monthly/pisces_full.php
You start the year off in a highly social mood, and no wonder - December may
have turned out to be surprisingly busy for your career, and you probably
barely had a chance to get into the swing of the holiday season before it
was over. Now, everyone is ready to get back to work, and you may feel a
little cheated out of the time you needed to relax. You will have it now.
Stay cheerful, dear Pisces, because with the Sun, Pluto, and ... 阅读全帖 |
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t***y
发帖数: 182 | 40 source:
http://www.astrologyzone.com/forecasts/monthly/cancer_full.php
Cancer Horoscope for March 2012
By Susan Miller
As a Cancer, you are a steadfast person, and always careful to fulfill your
responsibilities to others. Somewhere on the bottom of your list, assuming
you can find the time, you indulge in a little leisure fun. Over the past
year or two, those hours of enjoyment have become increasingly limited. The
good news is that in the first half of March, the universe will make a
correctio... 阅读全帖 |
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t***y
发帖数: 182 | 41 source:
http://www.astrologyzone.com/forecasts/monthly/aries_full.php
Aries Horoscope for March 2012
By Susan Miller
You area getting closer to birthday time of the year, so before you get to
the end of the month, take a weekend off to think about what you hope the
next year will bring you. Visualize the new elements of your life as if it
were a movie. See each scene clearly, down to the tiniest detail. Experts
say that the mind processes a dream that you design, like this one, in the
same way t... 阅读全帖 |
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t***y
发帖数: 182 | 42 来自：susanmiller小组（http://www.douban.com/group/susanmiller/）
搬运排版： MQ-美棋 译者：幻觉
译文：
——————————————— ★★★正 文★★★ ——————————————
4月是个一分为二的月份，上半月，财务事宜占据了你的精力，之后的下半月，是有很
多娱乐、放松活动，还可能去旅行的时候了。要记住，下半月的时候将为你打造更好的
氛围，而这个月的前两周，你要忙于你的收入、支票簿、计算小票这些事情上。这种财
务上的忙碌是暂时的，所以也要为下半月会很好感觉高兴哦！
如果看看你的整体状况，你长期以来一直在处理困难的财务局面，也许这远从2009年10
月就开始了，土星从那时候起一直在天秤座行运，明显的限制了你的收入。看起来你一
直在应对预算紧缺的老板和客户，所以情况变得更加困难，并且换工作也没得到帮助—
—如果你曾去面试工作，也遇上的一样的情况。同时，你的开支也上升了，你肯定感觉
自己陷入财务困境。
等到今年10月份的时候，你紧缩的现金状况就会消除，那时土星将离开天秤座这个对你
来说较为艰难的位置。但这个月你还遇上4月6日的满... 阅读全帖 |
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t***y
发帖数: 182 | 43 正文 译者：苏沫沫
今年对每个人来说都是不平常的一年，所以如果对事情的进展缓慢而感到沮丧的话，大
家都一样。这种情况来源于自1月23号到4月13号的火星逆行。感谢上帝，火星从4月14
号开始移动（尽管缓慢），因为火星是行动之星，它给我们额外的魅力，并推动我们所
做的所有的事情向前行。当火星睡觉的时候，你会发现在生活的任何阶段，不管是商业
还是普通的个人事务都很难恰当的推动事务的进展。
从5月15号到6月27号，金星的开始逆行将会带来更大的影响，因为金星是你的主宰之星。
因为有更多的关于逆行的消息，所以我现在就会告诉你下一个。6月27号之后，你有两
周没有逆行的时间，然后是7月14号到8月8号的水星逆行。对此我们都很烦恼，虽然我
不想告诉你这个，但是我觉得我还是应该告诉你。在我记忆中没有比这一次的水逆更糟
糕的了，看起来全宇宙都想让我们小心翼翼的，并且慢下来。
如果你仔细观察这些日期（在我写的年运里那些我仔细标记在我的来年日历里的日期）
，宇宙将给我们些补丁时间去采取果断的行动。这些补丁时间是开始新的冒险的绝好时
间，我们现在是其中之一。（机会之窗在4月13日和5月15日之间为我们打开）... 阅读全帖 |
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M*******s
发帖数: 2630 | 44 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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s******r
发帖数: 4749 | 45 ☆─────────────────────────────────────☆
nanodeal (hehe) 于 (Sun Oct 3 10:22:59 2010, 美东) 提到:
是hunter PGP的，
请指教一下
谢谢
☆─────────────────────────────────────☆
sdfarmer (农民三弟打鸟打松鼠) 于 (Sun Oct 3 11:16:24 2010, 美东) 提到:
如果这头是处于同一路里的最低处， 那是正常的， 管子里有残余的水啊
☆─────────────────────────────────────☆
SSA (Panda on the rope) 于 (Sun Oct 3 11:53:06 2010, 美东) 提到:
同意 sdfarmer. 水往低处留，管道里残留的水会冒出来的。
看看多长时间水没有冒出来。还有注意听那个阀门那里。如果
阀门有轻微的嗤嗤的声音，那有可能没有关紧，需要看一看。
☆─────────────────────────────────────☆
nano... 阅读全帖 |
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u*****u
发帖数: 2651 | 47 来自主题: LeisureTime版 - 年度之歌 歌中的天梯不是上牙膛吧，俺觉得应该是Space Elevator
天梯，又译空间电梯 (Space Elevator)，是一种低成本将有效载荷从地球或其它星球
的表面运输到空间的解决方案。这个方案旨在建造一部称作天梯的运输工具。
http://en.wikipedia.org/wiki/Space_elevator
With a space elevator, materials might be sent into orbit at a fraction of
the current cost. As of 2000, conventional rocket designs cost about $11,000
per kilogram for transfer to low earth or geostationary orbit.Current
proposals envision payload prices starting as low as $220 per kilogram.
Philip Ragan, co-author of the book "Leaving th |
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e*******c
发帖数: 2133 | 48 The square of the orbital period of a planet is directly proportional to the
cube of the semi-major axis of its orbit.
取完对数之后，两个变量就简单线性相关了啊
其实人文对自然科学帮助挺大的。近代科学的发展肯定要归功于数学的发展，而近代数
学的发展其实要归功于阿拉伯数字的广泛应用。 |
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b*s
发帖数: 82482 | 49 这个很er。一般都是先park在orbit上的，在orbit上如何左右？
哈哈哈，这句很酷。以后一定要加进登录火星的故事里 |
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