r*********r
发帖数: 1892 | 1 来自主题: Programming版 - 语言区别 一位美国CS写的，各位大拿如何看？
The Languages
C++ is well-suited for large projects because it has an object-oriented
structure. People can collaborate on one program by breaking it up into
parts and having a small group or even one individual work on each part. The
object-oriented structure also allows code to be reused a lot, which can
cut down development time. C++ is also a fairly efficient language -
although many C programmers will disagree.
C is a popular language, especially in game programming, becau... 阅读全帖 |
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mn
发帖数: 46 | 2 If you're interested in working for SAS, #1 best place to work. PM me.
Thanks.
===
Job Description
Software Developer-11003071
Description
Join the world's leading statistical software company and make a difference
in the way that analytical software is developed and deployed. SAS is
expanding its software for high-performance analytics.
In this position you will develop and support SAS software components for
high-performance computing. You will work closely with Ph.D. specialists in
statistics... 阅读全帖 |
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m*******e
发帖数: 438 | 3 在fashion也发了一次,借人气宣传环保
大会小会开的,也不全是废话,今天会后每个人发一reusable shopping bag,要用实际行
动支持环保
大家一起改用reusable shopping bag吧,减少垃圾,CO2 |
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o****o
发帖数: 8077 | 4 【 以下文字转载自 Computation 讨论区 】
发信人: mn (照澜院院士), 信区: Computation
标 题: High Performance Computing software engineer wanted @ Cary NC
发信站: BBS 未名空间站 (Fri Jan 13 15:30:27 2012, 美东)
If you're interested in working for SAS, #1 best place to work. PM me.
Thanks.
===
Job Description
Software Developer-11003071
Description
Join the world's leading statistical software company and make a difference
in the way that analytical software is developed and deployed. SAS is
expanding its software for high-performa... 阅读全帖 |
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w*******y
发帖数: 60932 | 7 Today Only Disney store is offering Free shipping on any order if you
purchase any TANGLED item. Valid through 11/24
Code: TANGLED
The cheapest one is this Rapunzel reusable tote ($2.50): Link:
http://www.disneystore.com/reusable-tangled-rapunzel-tote/mp/1266307/1000052/
Also, you can get 20% off any TANGLED item (valid through12/24). Didn't
work on the tote, but worked on a Rapunzel doll for me.
Code: PASCAL
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w*******y
发帖数: 60932 | 8 I am compiling all the Earth day freebies of 2011 in this one thread here...
hope u all find it useful..
1. Free reusable tote at target (with any purchase) on apr 17
Link:
http://www.target.com/b?node=2670210011&ref=eco&AFID=Performics
2. free cosmetics samples from Origins (at stores) if u bring in any empty
cosmetics like jars/tubes etc. 22 Apr
see my thread here for more details
http:// />
3. Starbucks free coffee/tea if u bring in ur own travel cup on apr 22 yMMV
, pls rep the OP here
http:... 阅读全帖 |
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w*******y
发帖数: 60932 | 9 I was sad to see these sell out when I tried to order a couple more....but
this morning I noticed that they were back in stock. According to the email
this was in, PRICE EXPIRES TODAY.
Handy Gourmet Large 26"x16.25" Non Stick Oven Liner
$6.99 + Free Shipping
Good Luck!
Never have to clean the bottom of your oven again! Even burned or baked on
messes wipe away with soapy water and sponge. Spillovers clean up fast and
easy. Non-stick coating on both sides. Lasts for years. Reusable liners can
be t... 阅读全帖 |
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w*******y
发帖数: 60932 | 10 Amazon:
http://www.amazon.com/Wikki-Stix-Big-Count-Box/dp/B000PEN8U0/re
currently has Wikki Stix Big Count Box for $9.59 (Free shipping with Prime
or eligible for FREE Super Saver Shipping on orders over $25).
Product Description
Big count for big fun! 468 Wikki Stix One-of-a-Kind Creatables in 13 colors.
.. all in a "cigar-style" box that is perfect to decorate with Wikki Stix
and use for storage. Includes 12-page fun booklet of arts and crafts ideas,
plus colorful projects sheets. Easy to us... 阅读全帖 |
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w*******y
发帖数: 60932 | 11 Yes, this is maybe for real!
Link:
http://www.tripalertz.com/deals/detail/119-XCOR-Lynx-Mark-I-33-
Along with your actual, possibly real, space flight, you get:
* Five-night stay @ Sanctuary Camelback Mountain Resort during training &
preparation (before the flight)
* $5,000 TripCash to first 25 buyers ( ) (this is good on TripAlertz, btw..
.) (I think)
* Medical evaluation and screening
* Cancellation insurance policy (whew)
* Personalized high definition DVD recorded by onboard cameras along ... 阅读全帖 |
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i*****f
发帖数: 578 | 12 这个是根据著名的stackoverflow讨论总结的最具影响力编程书籍。与大家分享。BTW,
其中的CLRS introduction to alg我认为很适合用python.
http://www.internetsecuritydb.com/2011/09/top-ten-most-influent
programming.html
"If you could go back in time and tell yourself to read a specific book
at the beginning of your career as a developer, which book would it be."
Since it was first posed back in 2008, this question has become the
second most popular question of all time on StackOverflow.
Here are the results:
Code Complete (2nd Edition)
By Steve... 阅读全帖 |
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B********e
发帖数: 310 | 13 N95 （95% filter efficiency level)应该没问题。
不过disposable的，应该比reusable 的便宜。我找的donated面罩，说明书上说，除了
外科手术只能用一次以外，其他情况可以重复使用直到损坏，呼吸困难，被血和液体污
染为止。不知disposable 的怎样。你仔细看看。 |
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s********e
发帖数: 13723 | 14 更多图请看http://bbs.cjdby.net/thread-887139-1-1.html
AERODYNAMIC CHARACTERISATION OF RLV-TD
NAL trisonic wind tunnel facility is being used extensively to characterize
the aerodynamics of Reusable Launch Vehicle Technology Demonstrator (RLV-TD)
configuration during various phases of flights as well as to generate very
important data viz. FADS calibration coefficients, hinge moments, unsteady
aerodynamics, flow visualization and dynamic derivatives of RLV-TD HEX-1
mission, which is planned in the mi |
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t******t
发帖数: 15246 | 15 ISRO begins process for Human Space Flight Mission：
http://www.ptinews.com/news/4861 ... pace-Flight-Mission
Hyderabad, Jan 26 (PTI) ISRO's Satish Dhawan Space Centre (SDSC) in
Sriharikota will soon initiate the process of creating Third Launch Pad for
human transportation into space, SHRC Director Chandra Datttan today said
during Republic Day celebrations.
After unfurling the Tricolour at the SDSC, he said the work may start in six
months with an estimated cost of Rs 12,000 crore.
The Third La... 阅读全帖 |
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t***h
发帖数: 5601 | 16 http://www.bbc.co.uk/news/magazine-11417677
The fight against clothes line bans
By Tom Geoghegan, 7 October 2010, BBC News Magazine
For decades, the clothes line has had an image problem in the US but, ahead
of a rally to highlight the benefits of natural drying, is it about to be
reclaimed?
There is a new protest movement sweeping the US and at its heart are two
sticks and a piece of string.
Upon the humble clothes line, a battle line has been drawn that embodies a
uniquely American clash of id... 阅读全帖 |
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M*****n
发帖数: 16729 | 17 reusable shopping bag要多少钱？
俺上次买了两瓶酒，超市送了一个，可以装六瓶酒的那种。这是俺唯一的尼龙袋了。
白妞装垃圾都是买垃圾袋的。 |
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c**i
发帖数: 6973 | 18 I am a biologist by training. But it appears you are as ignorant about
rockets as I.
(1) Tiangong 1 weighs merely 8.5 metric tons (hereafter tonnes). Besides
Tiangong 1 on Sept 29, 2011 Long March 2F also launched Shenzhou 5 (in 2003)
, 6 and 7, all into low Earth orbit (LEO), which is defined as "from the
Earth’s surface up to an altitude of 2,000 km."
http://en.wikipedia.org/wiki/Low_Earth_orbit
In comparison:
Geostationary transfer orbit
http://en.wikipedia.org/wiki/Geostationary_transfer_orb... 阅读全帖 |
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y*h
发帖数: 25423 | 19 不必这么痛心疾首，性资源和石油不一样，是可再生的资源，recyclable and
reusable 。女博后最后还是要让wsn接盘的，性资源并没有被消耗而消失。 |
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T**********e
发帖数: 29576 | 20 Most rockets are designed to be expendable, burning up in Earth's atmosphere
after delivering their payloads to space. SpaceX wants to develop fully
reusable launch vehicles, which experts say would make spaceflight much
cheaper and more efficient.
The 10-story-tall Grasshopper is a big step in this direction, company
officials say. The rocket takes off and lands vertically, touching down on
four metallic legs back at its launch pad.
【 以下文字转载自 Joke 讨论区 】
发信人: kejer (kejer), 信区: Joke
标 题: 这个看起来很... 阅读全帖 |
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xt
发帖数: 17532 | 21 湾区高科技，写程序的最讲究reusable啦，当然是先把原料做成
一个Generic Dish，然后根据你的选择再继承一下就可以了。 |
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z******i
发帖数: 986 | 22 大体说来，登月亮的过程是，让火箭推动带有载人舱的卫星突破第一宇宙速度成为地球
的卫星，然后经过变轨进入与月球同步的卫星轨道后，释放一个小型登月卫星舱到月球
。从理论上讲，这个登月卫星舱降落到月球容易，但回来是最空难的。
对天体物理有常识的人都明白，月球质量比地球小很多，引力也只有地球的差不多1/6
，而且还没有大气层的巨大阻力。所以，从月球上发射小型载人太空舱返回月球卫星轨
道的技术难度和操作困难与地球比就小很多很多。 也就是说，只要落到月球表面的载
人舱支架还在，上面的返回火箭没有物理性坡坏，人坐进去后，启动火箭再回到月球轨
道应当没有多大技术问题。
当然了，当登月舱从月球重新返回月球卫星轨道或者直接进入与月球平行的地球轨道后
，与在那里同步运行的飞船对接，或者直接经过变轨而降落到地球不是不可能的事。
美国60年代末到70年代的10年间，是太空技术突飞猛进的时期，其中1969开始的
project， a system of reusable spacecraft，也就是我们现在知道的航天飞机，在
差不多10年后的1981年完成，1982年后载人上天就差不多象坐公共汽车一样了。
所以，... 阅读全帖 |
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b*****e
发帖数: 474 | 23 ：美国60年代末到70年代的10年间，是太空技术突飞猛进的时期，其中1969开始的
project， a system of reusable spacecraft，也就是我们现在知道的航天飞机，在
差不多10年后的1981年完成，1982年后载人上天就差不多象坐公共汽车一样了。
了。
你这“差不多”差得不止有点多
墙裂要求“坐公共汽车” |
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z******i
发帖数: 986 | 24 我发现你屁都不懂，就一打餐馆的能耐，还在这里厚着脸皮大言不惭，不知害羞的评价
航天飞机技术问题？ 说实话，我估计你的智商也就小学二年级的水平。
航天飞机 a system of reusable spacecraft，或者称 space shuttle, 只所以飞近地
规道，low Earth orbit， 不是它自身包含的技术成分所决定的。而是它的设计目的就
是到同步运行的那个轨道去往返做它该做的事情，并不是它不可以飞到与月球平行的轨
道，而是飞到那里不符合它的目的，也不是它的目标。
航天飞机上天，不是它自己本身动力开上去的，而是绑在火箭肚子上让火箭把它推上去
的。要把它推到近地轨道或者其它设计好的轨道，取决于人们对它赋予的任务和目的以
及用于推动它的火箭的推力而已。从理论上讲，它既然可以被推到近地轨道，当然没有
任何技术难度可以被推到其它地球轨道。
也就说，航天飞机去什么轨道是运载它上天的火箭推力决定的，不是它自己决定的。
当然了，航天飞机的技术难度在于穿过大气层时的考验，而不是被推到外太空的轨道选
择。举个简单的例子就是，如果你脸皮的厚度和结实程度以及全身能忍受了高速大气物
理摩... 阅读全帖 |
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s*x
发帖数: 8041 | 25 这个会不会最后又变成跟航天飞机似的，本来reusable是为了节省成本，结果要解决的
技术问题太多，最后变成一个噱头，completely beat the purpose. |
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s*x
发帖数: 8041 | 26 Musk said in 2011 that a reusable rocket program could reduce capital costs
of the rocket to $50,000 if it is reused 1,000 times.
1000次啊1000次，我没看错吧 |
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T**********e
发帖数: 29576 | 28 ULA的新Vulcan火箭要只回收一级发动机，燃料罐就扔了，发动机分离后打开一个防热
罩，然后降落伞减速，直升飞机半空中捕捉。
A sample illustration of mid-air recovery of main engine section.
ULA chief explains reusability and innovation of new rocket
CAPE CANAVERAL — United Launch Alliance will salvage the main engines
through a mid-air recovery plan and reuse them again aboard the company’s
new Vulcan rocket, saving 90 percent in booster propulsion costs, the
company announced Monday.
It is dubbed SMART Reuse, or Sensible Modular Autonomous Return Techno... 阅读全帖 |
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Z**R
发帖数: 1233 | 29 There has been an explosion on the launch pad at the Kennedy Space Center in
Florida, where the aerospace company SpaceX was readying an unmanned rocket
for launch.
The cause of the blast is not clear and it is not known if anyone was hurt.
Nasa said SpaceX was test-firing a rocket which was due to take a satellite
into space this weekend.
Pictures from the scene show a huge plume of smoke rising above the Cape
Canaveral complex.
The force of the blast shook buildings several miles away.
Local e... 阅读全帖 |
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m**c
发帖数: 7349 | 30 Elon Musk is most comfortable on the cutting edge. From cars to spaceflight
to solar energy, it’s no secret that the entrepreneur likes to push the
envelope.
But the explosion of a SpaceX rocket last week raises the question: Is the
CEO pushing too hard?
A semi-reusable Falcon 9 rocket, one of several built by Musk’s SpaceX firm
to deliver payloads to the International Space Station, exploded during a
routine firing test at Cape Canaveral Air Force Station on Thursday. The
craft was slated to ca... 阅读全帖 |
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s*******u
发帖数: 9508 | 31 SpaceX offered to use a pre-flown rocket for the Intelsat 35e satellite,
but Intelsat declined, said Ken Lee, senior vice president for space systems
for Intelsat.
"We have ongoing conversations about how many successful missions are needed
before we consider that to be a reliable launch vehicle," Lee told Space.
com. "Typically, there's a minimum of three."
"I would have no qualms about using the pre-flown hardware in the future
once they have fully demonstrated their reusability," he said.
Whi... 阅读全帖 |
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c*********d
发帖数: 9770 | 33 https://www.toutiao.com/i6507926128718512644/?iid=22819617214
中原新声2018-01-06 21:17:09
如果要我找出过去10年里在财富方面最让我后悔的2件事情：
第1，是2011年有几天曾使劲儿钻研比特币，确认不是骗局，那时候，比特币的价格是6
.9美元，然后，就丢开了；
第2，是2014年有一阵使劲儿钻研了瑞波币，确认不是骗局，那时候，瑞波币的价格是1
.1-1.3美分，然后，就丢开了。
恩，比特币2017年曾上涨到1.9万美元，现在是1.6万美元；
恩，瑞波币昨天上涨了64%，目前是3.6美元。
因为一堆一堆的虚拟币骗局出现，2014年之后我基本放弃了对这些数字货币的研究——
直到2017年下半年比特币大涨之后，我才重新拾起这些加密货币的知识，现在更是在从
头恶补关于区块链的一系列知识。
……
在《改造金融系统？区块链可以这样做》（参见文尾附文）一文中，我初步讲了区块链
技术的发展历史、核心价值以及应用场景，很多人说没有看懂，也没有感觉。
今天轻松一点儿，给大家讲讲美国印第安人的历史。
-------... 阅读全帖 |
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发帖数: 1 | 34 美国将于2月6日发射目前世界上最强大的火箭Space X, Falcon Heavy，可送人类至火
星！
If you have space-obsessed friends, you might have heard the name "Falcon
Heavy" used a lot lately.
Falcon Heavy is a brand new rocket that's set to launch for the first time
ever on February 6, SpaceX announced on Saturday.
The buzz can be attributed to the Falcon Heavy's size: It will be the most
powerful rocket in the world. It's built by SpaceX -- the industry-
disrupting rocket maker started by billionaire Elon Musk.
If you're just catchi... 阅读全帖 |
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发帖数: 1 | 36
再例举几个：Wikipedia，Google Maps, Reusable Rockets, Metal 3D Printing |
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发帖数: 1 | 37 SpaceX’s ‘Starhopper’ – the test vehicle for a reusable long-haul
spacecraft project – has burst into flames after a series of tests in Texas
. The craft was left damaged by the blaze. |
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发帖数: 1 | 38 川普和碰死2024送美国女人上月球言犹在耳
这边nasa已经把测试时间推迟到2024年了！
哈哈哈😂😂
NASA has announced plans to work with American companies to design and
develop new reusable systems for astronauts to land on the lunar surface.
The agency is planning to test new human-class landers on the Moon beginning
in 2024, with the goal of sending crew to the surface by 2028. |
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w*******g
发帖数: 9 | 40 Toilet paper makes up a decent sized chunk of many people’s household
budgets. It’s not cheap. When you have a big family or people who just reel
it off the roll, the costs go even higher. If you want to cut some money
from your budget, there are ways to do without traditional toilet paper.
The first way is to use reusable cloths. You can use old washcloths, cut up
some cloth diapers, or even buy special cloth toilet wipes. Despite the ick
factor involved, this idea really isn’t that different f... 阅读全帖 |
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t*******r
发帖数: 22634 | 41 这里靠 VC 或者类似 VC 的资金来支持这个阶段，外加商业合作伙伴的支持。
其前提是有足够新技术将来能有大利润。VC 不会被一点失败率捆住手脚，主
要还是看将来前景。VC 的策略就是 10 家里面赔掉 9 家，但只要赚上 1 家，
那 1 家可能就赚了 20 倍不止，刨掉 9 家血本无归的，还是大赚。商业合作
伙伴搞这个也可能亏掉一些自己的项目，但是一般都有协议，搞成的话优先让
商业合作伙伴先享受，那样搞成以后、商业合作伙伴就能有相对于商业竞争对
手有先手抢占产业链下游相关市场的优势，从而获得一段时期的半垄断利润。
SpaceX 的头是 IT 出生，对于说服 VC 和商业合作伙伴的支持，应该有其一
套的。再说伊是搞 reusable，如果能搞成实用，前景估计是绝对看好 …………
业的
帮太
有什 |
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O**l
发帖数: 12923 | 43
你的问题在于人为
sx的东西完全抄苏联r-7 和苏联的老古董一模一样 哈哈
他的reusable 一点都没用 |
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O**l
发帖数: 12923 | 44
sx reusable 技术为啥不是f22 呢 |
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O**l
发帖数: 12923 | 45
现代技术器件的可靠性计算能力提高
借鉴老技术 重新设计
达到reusable 有什么不可能
我估计航天飞机借鉴过去的技术 现代器件重新做 估计也便宜很多
为啥认定SX完全一模一样照抄苏联的火箭 一点自己的东西都没有
就算照抄器件也和50年前的一样？ |
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O**l
发帖数: 12923 | 46
问题是50年前那玩意做不到低成本 reusable
sx这玩意显然不是原封不动的 r-7 |
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发帖数: 1 | 47 早在上世纪80年代末，苏联就曾设想过多重可复用的火箭系统。其中最令人印象深刻的
，是以“能源”号超级火箭为母型研制的ГК-175可回收式重型运载火箭。其最大的特
征，在于配备了可独立飞行滑翔降落的助推器组件。在火箭发射以后，全部助推器将在
空中展开机翼，以滑翔的方式着陆返厂。
ГК-175可回收饲重型运载火箭畅想。其主体部分接近一架无人航天飞机，而助推器则
各自独立具备机翼构造
上述手段科幻且炫酷，但存在着相当大的技术风险。而相对简单的，则是自上级70年代
末起就开始构想的可部分回收火箭系统。在上述构想中，火箭只有发动机部分是需可回
收的。在完成任务后，火箭的发动机部分从箭体上分离、气动减速，并在下降到一定高
度后展开降落伞。这时，将会有一架安装了天钩回收系统的飞机从其上方略过，钩住降
落伞将其收回。整个回收过程很类似飞船返回舱【注释：在SpaceX咄咄逼人的攻势下，
ULA考虑采用这个方案，实现下一代运载火箭的部分回收复用】。
那么SpaceX的回收将采用哪一种方式呢？都不考虑。
类似于ГК-175滑翔回收方式，存在系统复杂且的风险。而天钩模式虽然较为可靠，但
也需要一套独立的分离、... 阅读全帖 |
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m*3
发帖数: 214 | 48 惊闻汶川噩耗，全球华人绝大多数扼腕悲伤。既此全民哀悼之际，却总有少数丧家的
金钱的“乏”刁奴大唱反调，身藏黄金忆两，却只舍弃分文，甚乃限制员工捐款，
美其名曰“不以慈善为负担”。一时喧嚣不已，搅乱了大家的心情。
这次抗灾，为富不仁者不在少数，但其类大多尚能保持缄口。可偏偏有奴，自认高
人一等，超凡脱俗，大做“一元钱”之文章。更有甚者，竞撇出“中国多灾论”，
生怕损害他那“每个毛孔都流着血和肮脏的东西”。究其所论，这次汶川之震规模
太小了，如果全中国的房子都震塌了，那X科才真的会大发其财了。又或者，彼类正
希望，未来之房屋，就如REUSABLE的塑料袋一样，那样它就会更加门庭若市了。
此类鼠目寸光的金奴，却不知水能载舟，亦能覆舟，皮之不附，毛之焉存。经此一
事，国人更看清了它们的尖酸嘴脸，深恐它所失掉的顾客信心，要远大于所得。如
果在此危难之际，彼类都不惜釜底抽薪，又怎能让顾客相信，它所经手的新建房屋
没有缺工少料，安全隐患？伤民所望的后果，空中客车体验过，家乐福正在体验，
X科的刁奴们，也迫不急待要体验一下了。
既来之，则安之。既然人家的尖嘴猴腮都凑上来了，那大家只好赏它个嘴巴。正所 |
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M*V
发帖数: 3205 | 49 大体说来，登月亮的过程是，让火箭推动带有载人舱的卫星突破第一宇宙速度成为地球
的卫星，然后经过变轨进入与月球同步的卫星轨道后，释放一个小型登月卫星舱到月球
。从理论上讲，这个登月卫星舱降落到月球容易，但回来是最空难的。
对天体物理有常识的人都明白，月球质量比地球小很多，引力也只有地球的差不多1/6
，而且还没有大气层的巨大阻力。所以，从月球上发射小型载人太空舱返回月球卫星轨
道的技术难度和操作困难与地球比就小很多很多。 也就是说，只要落到月球表面的载
人舱支架还在，上面的返回火箭没有物理性坡坏，人坐进去后，启动火箭再回到月球轨
道应当没有多大技术问题。
当然了，当登月舱从月球重新返回月球卫星轨道或者直接进入与月球平行的地球轨道后
，与在那里同步运行的飞船对接，或者直接经过变轨而降落到地球不是不可能的事。
美国60年代末到70年代的10年间，是太空技术突飞猛进的时期，其中1969开始的
project， a system of reusable spacecraft，也就是我们现在知道的航天飞机，在
差不多10年后的1981年完成，1982年后载人上天就差不多象坐公共汽车一样了。
所以，... 阅读全帖 |
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发帖数: 1 | 50 怎麼沒念過？我是 PhD in Restaurant Management, with am emphasis on
Sustainable Kitchen Management. 我有兩個碩士，MA in Floor Mopping and an MA
in Dish Washing on Reusable Asian Dinnerware. |
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