q**w
发帖数: 782 | 1 http://www.technologyreview.com/view/509106/best-of-2012-chines
Best of 2012: Chinese Physicists Smash Distance Record For Teleportation
The ability to teleport photons through 100 kilometres of free space opens
the way for satellite-based quantum communications, say researchers
Teleportation is the extraordinary ability to transfer objects from one
location to another without travelling through the intervening space.
The idea is not that the physical object is teleported but the information
th... 阅读全帖 |
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G**L
发帖数: 22804 | 2 你们搞物理的博士给讲讲大傻能传300公里的结论是肿么来的
http://en.wikipedia.org/wiki/Underwater_locator_beacon
A 37.5 kHz (160.5 dB re 1 μPa) pinger can be detectable 1–2 kilometres (0.
62–1.24 mi) from the surface in normal conditions and 4–5 kilometres (2.5
–3.1 mi) in good conditions. A 37.5 kHz (180 dB re 1 μPa) transponder
pinger can be detected 4–5 kilometres (2.5–3.1 mi) in normal conditions
and 6–7 kilometres (3.7–4.3 mi) in good conditions. Transponder 10 kHz (
180 dB re 1 μPa) range is 7–9 kilometres (4.3–5.6 mi... 阅读全帖 |
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S***1
发帖数: 3140 | 3 一次航程1.5万公里，时速60公里，可以从印度洋开到大西洋再回到太平洋。排水量
7200吨，载有16枚射程达295公里的“布拉莫"超音速巡航导弹。
Indian warship building is coming of age and the Indo-Pacific region knows
it. Last week, when an Indian Navy frigate, INS Shivalik, visited China’s
Qingdao naval base, China’s navy chief, Admiral Wu Shengli, asked the
captain for a tour of the Combat Information Centre, the operation heart of
the warship. The Shivalik’s young skipper, Captain Puruvir Das, turned down
Wu’s request.
The Chinese admiral would be even more in... 阅读全帖 |
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p********1
发帖数: 2785 | 4 现在铁道部说什么都是问题了.本人不懂统计,但觉得各行各业都有自己的行规吧,说话
之前先了解一下相关行规也不是没有用.以下是来自欧洲的一个参考.计算方法已经给出
.
1. Data source: The data on occupancy rates: Eurostat statistical compendium
, 2002.
2. Description of data: Occupancy rates, calculated by dividing passenger-
kilometres by the vehicle-kilometres.
Original measure units: Passenger-kilometres and vehicle-kilometres.
Table 3: Rail occupancy rates in 1999
Unit: passengers per vehicle
Occupancy rate
Austria (1998) 88
Belgium ... 阅读全帖 |
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s*****r
发帖数: 11545 | 5 http://news.yahoo.com/chinas-great-wall-disappearing-093701603.
Around 30 percent of China's Ming-era Great Wall has disappeared over time
as adverse natural conditions and reckless human activities -- including
stealing the bricks to build houses -- erode the UNESCO World Heritage site,
state media reported.
The Great Wall is not a single unbroken structure but stretches for
thousands of kilometres in sections, from Shanhaiguan on the east coast to
Jiayuguan in the windswept sands on the edge o... 阅读全帖 |
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l****z
发帖数: 29846 | 7 The British, covering the news U.S. media refuses to cover:
The speech by former US Vice-President Al Gore was apocalyptic. ‘The
North Polar ice cap is falling off a cliff,’ he said. ‘It could be
completely gone in summer in as little as seven years. Seven years from now.’
Those comments came in 2007 as Mr Gore accepted the Nobel Peace Prize
for his campaigning on climate change.
But seven years after his warning, The Mail on Sunday can reveal that,
far from vanishing, the Arctic AL_... 阅读全帖 |
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f*******n
发帖数: 12623 | 8 http://en.wikipedia.org/wiki/Bering_Strait_crossing#Economic_co
The Russian side, in particular, is severely lacking in infrastructure,
without any highways for almost 2,000 kilometres (1,200 mi) (the nearest is
M56) and no railroads or paved highways for over 3,200 kilometres (2,000 mi)
in any direction from the strait.
On the American side, at least 800 kilometres (500 mi) of highways or
railways would have to be constructed in order to connect to the American
transport network. |
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i*****s
发帖数: 15215 | 9 Search in a ‘floating feet’ case leads to troubled young man from Surrey,
B.C.
Tristin Hopper Sep 2, 2011 – 7:00 AM ET | Last Updated: Sep 2, 2011 10:33
AM ET
As Talib rounds a corner on Surrey, B.C.’s Annacis Highway, his destination
comes into view on the edge of the horizon. Although they stretch up to 150
metres from the Fraser River, from this distance the two towers of the Alex
Fraser Bridge look like nothing more than tuning forks.
When Talib (not his real name) left his parents’ suburban... 阅读全帖 |
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r********r
发帖数: 2912 | 10 "According to the rules, a marathon measures 42.195 kilometres. This is a
requirement for any potential world record to be validated by the IAAF.
Measurers build in a factor of 0.1% to prevent race courses from being
determined too short in re-measurements. As a consequence, a “marathon
kilometre” equals 1001 metres during measuring. If measured precisely, all
marathon race courses are therefore actually 42.237 kilometres. The extra 42
metres are designed to make up for possible measuring flaws... 阅读全帖 |
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z********o
发帖数: 18304 | 11
果然不愧是逼残脑残的人。
这么点简单的数学，你不会自己算？
“4.525 x 10 to the ninth cubic kilometres (4.525x1009 km3) Or, to put into
a more sensible number, 4,525,000,000,000 cubic kilometres ”
“4.525 x 10 to the ninth cubic kilometres”明显和我得出的数字是一致的。后面
那个数字明显是他写错了。
你逼残和脑残的程度简直令人发指。 |
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z********o
发帖数: 18304 | 12
果然不愧是逼残脑残的人。
这么点简单的数学，你不会自己算？
“4.525 x 10 to the ninth cubic kilometres (4.525x1009 km3) Or, to put into
a more sensible number, 4,525,000,000,000 cubic kilometres ”
“4.525 x 10 to the ninth cubic kilometres”明显和我得出的数字是一致的。后面
那个数字明显是他写错了。
你逼残和脑残的程度简直令人发指。 |
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i*********5
发帖数: 19210 | 13 http://www.cbc.ca/news/canada/ottawa/story/2013/08/26/ottawa-si
An Ottawa woman undergoing chemotherapy for pancreatic cancer completed the
Ironman Triathlon in British Columbia on Sunday, to the amazement of her
doctor.
Sindy Hooper, 50, finished the race in 16 hours and 24 minutes — the cut-
off to finish the race was 17 hours.
Her husband Jon also competed and completed the event.
Hooper swam four kilometres, biked 180 kilometres and ran 42 kilometres,
possibly becoming the first person to ev... 阅读全帖 |
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c**i
发帖数: 6973 | 14 Charles Lane, China’s Train Wreck. Washington Post, Apr 23, 2011 (opinion).
http://www.washingtonpost.com/opinions
/chinas-train-wreck/2011/04/21/AFqjRWRE_story_1.html
My comment:
(a) The first two thirds of this article talks about things we already know.
Please read from paragraph 3 of web page 2 that starts with "Word went
forth."
(b) The report cites
Stephen Chen, 'Judgment Day' Fears for High-Speed Rail Tracks. South China
Morning Post, Jan 10, 2011
http://topics.scmp.com/news/china-news-wa... 阅读全帖 |
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w****2
发帖数: 12072 | 15 转载请注明来自中国铁道论坛（http://bbs.railcn.net/）
从以上数据可以看出，
铁路总长度：2006年底，中国铁路营业里程达77083.8公里，居亚洲第一位。
印度Route Kilometres 63028
中国比印度多1.4万公里
线路总里程：2006年国家铁路（不包括合资铁路和地方铁路，本栏目以下诸条目皆同）
营业线路总延展里程 135360.9公里，比2005年的132854.6公里增长1.9％。
印度：Track Kilometres 108706（应该是这个数据）
电气化铁路：
电气化线路营业里程23435.4公里，比2005年的19408.2公里增长20.7％；
印度：Electrified路线公里14856
机车数量：
中国：国家铁路机车 拥有量16904台，内燃机车拥有量11348台，电力机车拥有量5465
台，蒸汽机车拥有量91台
印度：柴油机Diesel 4702Locomotives、电力机车Electric 2810、蒸汽机车Steam 54
、合计Total 7566台
人数：
中国国家铁路 职工252.36万人。干部573378人
印度铁 |
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c******k
发帖数: 8998 | 16 Zone of total destruction of the Tsar Bomba (as an example – over a map of
Paris): red circle = total destruction (radius 35 kilometres (22 mi)),
yellow circle = fireball (radius 3.5 kilometres (2.2 mi)). |
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h***y
发帖数: 4936 | 17 中国投资建设印度的基建项目，究竟是属于拓展市场还是制造吊死自己的绳子，估计没
有定论。唯一可以确定的是，去那边投资建设风险极大，工期经常一拖再拖，却赚不了
多少钱。
Chinese infrastructure projects in India stalled by red tape
Reported by Anchal Vohra, Edited by Amit Chaturvedi | Updated: May 23, 2013
12:11 IST
New Delhi: Along with talks on resolving border disputes, India and China,
the two most populous and fastest growing Asian economies, are talking
business and laying a roadmap to reach a 'dynamic balance' in bilateral
trade.
Bilateral trade between the two nations reach... 阅读全帖 |
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t***h
发帖数: 5601 | 18 AFP Updated June 27, 2013
BEIJING (AFP) -- Riots in China's ethnically divided Xinjiang region on
Wednesday left 27 people dead, according to state media which said police
opened fire on "knife-wielding mobs".
It was the deadliest spasm of violence to hit the troubled western region
since 2009. Xinjiang is about twice the size of Turkey and is home to around
10 million members of the mostly Muslim Uighur ethnic minority.
Police shot at "mobs" who had attacked police stations, a local government
... 阅读全帖 |
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t***h
发帖数: 5601 | 19 AFP Updated June 27, 2013
BEIJING (AFP) -- Riots in China's ethnically divided Xinjiang region on
Wednesday left 27 people dead, according to state media which said police
opened fire on "knife-wielding mobs".
It was the deadliest spasm of violence to hit the troubled western region
since 2009. Xinjiang is about twice the size of Turkey and is home to around
10 million members of the mostly Muslim Uighur ethnic minority.
Police shot at "mobs" who had attacked police stations, a local government
... 阅读全帖 |
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w********s
发帖数: 1570 | 20 allowing it to have both long range as well as anti-stealth capabilities. It
has an official range of 3,000 kilometres (1,900 mi) but in 1997 the
prototype was able to detect missile launches by China[6] over 5,500
kilometres (3,400 mi) away.
Jindalee uses 560 kW as compared to the US's OTH-B's 1 MW, yet offers far
better range than the US 1980s system, due to the considerably improved
electronics and signal processing.[7] |
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c*****g
发帖数: 21627 | 21 五毛就是不懂商业间谍，
五毛最喜欢喊的口号是“世界人民大团结万岁”
在波音没有破坏之前，协和的安全记录是最安全的
Prior to the accident, Concorde had been arguably the safest operational
passenger airliner in the world in passenger deaths-per-kilometres travelled
with zero
波音破坏和霉国自导自演的911之后，安全记录不好看了，没有乘客坐协和了，没多久
就破产了
They cited low passenger numbers following the 25 July 2000 crash, the slump
in air travel following the September 11, 2001 attacks, and rising
maintenance costs.
＝＝＝＝＝＝＝＝＝＝＝＝＝＝＝＝＝＝＝
Concorde Flight 4590 crash[edit]
Main article: Air Fran... 阅读全帖 |
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o*********e
发帖数: 3093 | 22 http://www.smh.com.au/world/china-puts-on-huge-show-of-force-at
China puts on huge show of force at parade
Beijing: In a broadcast to the world of its rising power and growing
military capability, China has paraded a procession of tanks, fighter jets
and ballistic missiles through the heart of Beijing's Tiananmen Square.
The proceedings were billed by Beijing as a commemoration for those who
fought and died in World War II, but most Western countries, including the
United States and Australia, a... 阅读全帖 |
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s*****e
发帖数: 1905 | 23 1 (statute) mile 英里=1.609 kilometres 千米
1 nautical mile 海里=1.852 kilometres 千米 |
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t***h
发帖数: 5601 | 24 http://www.ctbto.org/press-centre/press-releases/2013/ctbto-det
CTBTO detects radioactivity consistent with 12 February announced North
Korean nuclear test
Vienna, 23 April 2013
The CTBTO's radionuclide network has made a significant detection of
radioactive noble gases that could be attributed to the nuclear test
announced by the Democratic People's Republic of Korea (DPRK) on 12 February
2013.
The detection was made at the radionuclide station in Takasaki, Japan,
located at around 1,000 kilome... 阅读全帖 |
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s******8
发帖数: 4192 | 25 话说即使论货物运输美国铁路早就不是世界第一了
按照Tonne-kilometres of rail transport per year
中国2,696，美国2,326
按照Tonnes carried in rail transport per year
中国3,358，美国1,710
按照Freight modal share for rail
加拿大68%，美国44%（第6),中国31%（第11）。
按照Freight rail by tonne-kilometres per capita
俄国12,599，加拿大10,517，美国9,165，中国2,150（第5）
这种文章现在也就是美国人自己YY了。 |
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发帖数: 1 | 27 Bat cave solves mystery of deadly SARS virus — and suggests new outbreak
could occur
Chinese scientists find all the genetic building blocks of SARS in a single
population of horseshoe bats.
David Cyranoski
Researchers analysed strains of SARS virus circulating in horseshoe bats,
such as this one (Rhinolophus sinicus), in a cave in Yunnan province, China.
Credit: Libiao Zhang/Guangdong Institute of Applied Biological Resource
After a detective hunt across China, researchers chasing the origin ... 阅读全帖 |
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发帖数: 1 | 28 Type Intercontinental ballistic missile
Place of origin India
Service history
In service 2016-Current
Used by Strategic Forces Command
Production history
Designer Defence Research and Development Organisation (DRDO)
Manufacturer Bharat Dynamics Limited
Unit cost ₹50 crore (US$7 million)
Specifications
Weight 50,000 kg
Length 17.5 m
Diameter 2 metres (6 ft 7 in)
Warhead Nuclear
Warhead weight 1,500 kilograms (3,300 lb)
Engine Three stage ... 阅读全帖 |
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f********x
发帖数: 2086 | 29
做了下功课...
......
The ActiveE takes 8.5 seconds to reach 97 kilometres per hour (60 mph) and
its maximum speed is electronically limited to 140 kilometres per hour (87
mph)
......
The curb weight of the ActiveE is 1,815 kg (4,000 lb), nearly 360 kg (790 lb
) heavier than a BMW 135i, but the ActiveE has a 50:50 weight distribution.
....... |
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s*****a
发帖数: 3387 | 30 Majuro /ˈmædʒəroʊ/ (Marshallese: Mājro, [mʲ&#
230;zʲ(ɛ͡ʌ)rˠɤ͡oo̯]),[1] is a large
coral atoll of 64 islands in the Pacific Ocean, and forms a legislative
district of the Ratak Chain of the Marshall Islands. The atoll itself has a
land area of 9.7 square kilometres (3.7 sq mi) and encloses a lagoon of 295
square kilometres (114 sq mi). As with other atolls in the Marshall Islands,
Majuro consists of narrow land masses. |
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B******e
发帖数: 16928 | 31 就是中国土壤污染问题严重，每天吃饭相当于慢性中毒，这个基本问题不解决剩下的都
是浮云。
The bad earth:The most neglected threat to public health in China is toxic
soil
And fixing it will be hard and costly
Print edition | Briefing
Jun 8th 2017 | SHIQIAO, HUNAN PROVINCE
TANG DONGHUA, a wiry 47-year-old farmer wearing a Greenpeace T-shirt, smokes
a cigarette and gesticulates towards his paddy fields in the hills of
southern Hunan province. The leaves of his rice plants poke about a foot
above water. Mr Tang says he expects to harvest about ... 阅读全帖 |
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E****t
发帖数: 184 | 32 Hurricane or typhoonA hurricane or typhoon (sometimes simply referred to as
a tropical cyclone, as opposed to a depression or storm) is a system with
sustained winds of at least 33 metres per second (64 kn) or 74 miles per
hour (119 km/h).[15] A cyclone of this intensity tends to develop an eye, an
area of relative calm (and lowest atmospheric pressure) at the center of
circulation. The eye is often visible in satellite images as a small,
circular, cloud-free spot. Surrounding the eye is the eye... 阅读全帖 |
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f*********9
发帖数: 718 | 33 枫叶红 鲈鱼肥
最近二周非常的繁忙：感冒发烧，划船钓鱼和看枫叶赏秋色。 一样都没有少。
先上几张枫叶照片，给大伙润眼
这次去的湖: Big Rideau lake，是离渥太华附近的一个大湖，(32 kilometres long
and is 6 kilometres wide.)
http://en.wikipedia.org/wiki/Big_Rideau_Lake
里面有无数的湾， 最深的水300+英尺。 每次来这里kayaking都感觉是瞎子摸大恐龙的
感觉。只能安慰自己，这是一个锻炼长距离划船的好地方。
天气预报：微风多云，12度。 下船之后，测了水温：14c（57f）按照KVD的划分， 55f
以上都是秋天钓法。
http://www.bassmaster.com/vandams-6-season-bass-guide
但是后来感觉鱼的力道已经变小了，折腾不几下就老实了。
这次主打是spinnerbait,crankbait 和senko.
但是需要解决第一个问题也是最重要的问题：鱼在那里？这么大的湖，到那里找？
在一个湾口拿square bill 扫了2下，就中了第一条鱼... 阅读全帖 |
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c**i
发帖数: 6973 | 36 (A) Come on. Living in US, we know nothing about the Great Britain (GBR).
You should have given some introduction.
(1) Place names.
Most place names in Massachusetts are from GBR (the word Massachusetts is
Native American). That is why I have a vague idea where the namesakes are,
that you mention.
(a) Bristol
http://en.wikipedia.org/wiki/Bristol
(The town of Brycgstow (Old English, "the place at the bridge")[16] appears
to have been founded in c.1000)
Compare:
In Anglo-Saxon time, Cambridge was ... 阅读全帖 |
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z*****p
发帖数: 48 | 37 贴段路透社原文吧，虽然在浮躁的mit可能也没什么人愿意看。
(Reuters) - China will conduct and pay for a feasibility study in India for
a high-speed rail line to link Delhi with the southeast city of Chennai, a
spokesman for India's Ministry of Railways said on Tuesday, as the country
moves to modernise its creaking rail infrastructure.
China has been aggressively campaigning to export its high-speed rail
technology, including to governments in Malaysia, Thailand and Myanmar,
after building the world's longest domestic netwo... 阅读全帖 |
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m**d
发帖数: 21441 | 38 客运火车创造全国铁路测试速度新纪录，比原纪录提高了10公里。
据报道，在首都到阿格拉的一次测试中，印度一列客运列车创下了每小时160公里的全
国新的速度记录。引入高铁是莫迪总理在竞选时所做出的重要承诺，莫迪于5月赢得大
选。在3日的测试中，这列客运列车用90分钟完成了新德里到阿格拉200 公里的路程，
最高时速比之前的纪录提高了10公里。
NEW DELHI: An Indian passenger train set a new national speed record of 160
kilometres an hour (100 miles an hour) on Thursday during a test between the
capital and Agra.
The introduction of high-speed links and bullet trains were one of the key
poll campaign promises of Prime Minister Narendra Modi, who won elections in
May.
周... 阅读全帖 |
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s******l
发帖数: 278 | 39 43. Fail-Safe
Five kilometres from the terminus, driver-pilot Rupert
Chang had reduced speed yet again. Now, for the first time,
the passengers could see the face of the Tower as something
more than a featureless blur dwindling away to infinity in
both directions. Upwards, it was true, the twin grooves
along which they were riding still stretched forever-or at
least for twenty-five thousand kilometres, which on the
human scale was much the same. But downwards, the end was
already in sigh |
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s******l
发帖数: 278 | 40 53. Fade Out
The fact that he was still only thirty minutes behind
schedule seemed too good to be true; Morgan would have been
prepared to swear that the capsule had halted for at least
an hour. Up there in the Tower, now much less than two
hundred kilometres away, the reception committee would be
preparing to welcome him. He refused even to consider the
possibility of any further problems.
When he passed the five-hundred-kilometre mark, still
going strong, there was a message of con |
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s******l
发帖数: 278 | 41 55. Hard Dock
The record for one day's construction had been thirty
kilometres, when the slimmest and lightest section of the
Tower was being assembled. Now that the most massive portion
- the very root of the structure - was nearing completion in
orbit, the rate was down to two kilometres. That was quite
fast enough; it would give Morgan time to check the adaptor
line-up, and to mentally rehearse the rather tricky few
seconds between confirming hard-dock and releasing Spider's
brakes. I |
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P******l
发帖数: 1648 | 42 Is this true?
"现代地震学家发现，在靠近地核的地方，确实有巨大的低温岩石板块。如果这些板块的
沉降经历了亿万年，那么它应当早已热了起来。"
----------------------------------------------
earth
solid inner core radius 1,220 km
liquid outer core extends to a radius of 3,400 km
Earth/Radius 6,371 km
mantle is from 3,400 km to 6,371 km
http://phys.org/news/2015-12-temperature-kilometers-surface-earth-varied.html
regional variations in the lower mantle where it meets the core, which are
up to three times greater than expected,
3,000 kilometres below... 阅读全帖 |
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I******n
发帖数: 5952 | 43 老实说这方面我完全不懂，不过似乎引力波长都非常长。当然量子计算具体怎么回事儿
我也是完全不懂，不过这么长的波长怎么干扰量子计算机？每隔几天扰动一下？
Whereas astrophysical electromagnetic waves are typically much smaller than
their sources, ranging from a few kilometres down to sub-nuclear wavelengths
, gravitational waves are larger than their sources, with wavelengths
starting at a few kilometres and ranging up to the size of the Universe.
http://www.tapir.caltech.edu/~teviet/Waves/gwave_spectrum.html |
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H*******d
发帖数: 2394 | 45 没事在craigslist上转，突然发现有人卖04年的辉腾，估计是老黑在卖，换上了20寸的
rim。。。
V8 335HP，130k miles，$9500
查了下wiki，这车还是挺牛的：
Most of these specifications were not made known to the public, but a number
of them were told to automotive reporters. One of them was that the Phaeton
should be capable of being driven all day at 300 kilometres per hour (186
mph) with an exterior temperature of 50 °C (122 °F) whilst maintaining the
interior temperature at 22 °C (72 °F).[5] Piëch requested this even
though the Phaeton's top spee... 阅读全帖 |
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M*V
发帖数: 3205 | 46 India plays key role in building super machine that will offer unlimited
energy
LONDON: India is developing the heaviest and the largest parts of the
Tokamak, the machine behind the biggest scientific collaboration on the
planet, to produce unlimited supplies of cheap, clean, safe and commercial
energy from atomic fusion.
The international nuclear fusion project known as ITER, meaning "the way" in
Latin, is based on the 'tokamak' concept of magnetic confinement, in which
the plasma is contained ... 阅读全帖 |
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d******a
发帖数: 32122 | 47
四个小时跑了100公里，你就悲愤去吧
Ali Ganem Al Merri rode Diesel to victory in the 100-kilometre Shaikh Hamdan
Bin Rashid Al Maktoum Challenge 1 endurance ride at the Dubai International
Endurance City here yesterday.
Al Merri came up with a fine effort on the 10-year-old grey gelding to
finish the event with a timing of four hours three minutes and 36 seconds. |
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d*****g
发帖数: 441 | 48 12,000-year-old mine found in Chile
Posted Mon Dec 6, 2010 10:56am AEDT
Archaeologists from the University of Chile have discovered a 12,000-
year-old iron oxide mine in the north of the country.
Researchers say it is the oldest mine discovered in all the Americas.
Chief researcher Diego Salazar said the iron oxide was used by
Huentelauquen Indians as a pigment in dying cloth and in religious
rituals, revealing an unexpected sophistication in what was previously
considered a primitive group of p... 阅读全帖 |
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c**i
发帖数: 6973 | 49 Joseph Manning, Beyond the Pharaohs. Wall Street Journal, Mar 19, 2011.
http://online.wsj.com/article/SB1000142405
2748704893604576200393350126576.html?mod=WSJ_Books_LS_Books_8
(book review on Toby Wilkinson, The Rise and Fall of Ancient Egypt; The
History of a civilization from 3000BC to Cleopatra. London: Bloomsbury (2010
) and Manhattan: Random House (2011))
Quote:
"Known as the Saite period (ca. 650-525 B.C.) because the Egyptian capital
was located at Sais in the western Nile Delta, this pe... 阅读全帖 |
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