w****a
发帖数: 2049 | 1 high risk ultrasound is just ultrasound for high risk mom. ultrasound is
quite safe.
Ultraschall Med. 2012 Jun;33(3):215-7. doi: 10.1055/s-0032-1312759. Epub
2012 Jun 14.
[Obstetrical ultrasound: can the fetus hear the wave and feel the heat?].
[Article in German]
Abramowicz JS, Kremkau FW, Merz E.
Abstract
"Fetuses can hear ultrasound and the sound is as loud as a subway train
entering a station." This statement originates in a single report in a non-
peer reviewed journal, despite its name 1, ... 阅读全帖 |
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w*********s
发帖数: 2136 | 2 【 以下文字转载自 WorldNews 讨论区 】
发信人: whiteclouds (/ 参考消息 /), 信区: WorldNews
标 题: 传闻TG潜艇在LA发射导弹示威
发信站: BBS 未名空间站 (Tue Nov 16 02:08:30 2010, 美东)
Chinese Submarine was not the first on US coast
Sneaking subs into waters off the west coast — its happened before
By Wayne Madsen
The firing of a submarine-launched ballistic missile by a Chinese Jin-class
submarine off the coast of southern California lastMonday at the height of
evening rush hour in Los Angeles was not the first time the U.S. Navy's anti
-sub... 阅读全帖 |
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t***h
发帖数: 5601 | 3 SOSUS, an acronym for Sound Surveillance System, is a chain of underwater
passive SONAR arrays located around the world in places such as the Atlantic
Ocean and at various locations in the Pacific Ocean.
It was later supplemented by mobile hydrophones such as the Surveillance
Towed Array Sensor System (SURTASS), and became part of the Integrated
Undersea Surveillance System (IUSS). |
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c********e
发帖数: 2943 | 4 Video on Chinese state-run CCTV shot Saturday shows crew members from the
Haixun 01 boarding a small yellow dinghy and using what appears to be a
handheld hydrophone. The three men on board lower the device into the water
on a pole.
The handheld ping-locating technology used by the Chinese ship is not as
versatile as a U.S. Navy towed locator, which goes as deep as 20,000 feet,
far from surface noise, according to experts. |
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k**0
发帖数: 19737 | 6 你们这帮门外汉，google hydrophone吧，二战里就广泛运用了 |
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k**0
发帖数: 19737 | 7 现代潜艇用hydrophone array, 远得多。
所以说有可能是TG潜艇先发现然后让海寻去演戏的，否则用手持范围太小了。 |
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T**********e
发帖数: 29576 | 8 浮标探测器在水下300米能收到信号，现在要把6000米的潜艇运过来了。
PERTH, Australia (AP) — An Australian aircraft hunting for the missing
Malaysian jet picked up a new possible underwater signal on Thursday in the
same area search crews previously detected sounds that were consistent with
an aircraft's black boxes.
The Australian navy P-3 Orion, which has been dropping sound-locating buoys
into the water near where the original sounds were heard, picked up a "
possible signal" that may be from a man-made source, said Angus Ho... 阅读全帖 |
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t*****r
发帖数: 543 | 9 http://www.nytimes.com/2014/04/15/world/asia/chinas-efforts-in-
China’s Actions in Hunt for Jet Are Seen as Hurting as Much as Helping
By KIRK SEMPLE and ERIC SCHMITTAPRIL 14, 2014
KUALA LUMPUR, Malaysia — When a Chinese government vessel took the world by
surprise this month with its announcement that it had detected underwater
signals that might have come from the missing Malaysia Airlines plane, China
suddenly looked like the hero of the multinational search effort.
Within days, however, the ... 阅读全帖 |
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c*********d
发帖数: 9770 | 10 http://cn.nytimes.com/asia-pacific/20140415/c15search/
China’s Efforts in Hunt for Plane Are Seen as Hurting More Than Helping
By KIRK SEMPLE and ERIC SCHMITT April 15, 2014
KIRK SEMPLE, ERIC SCHMITT 2014年04月15日 KUALA LUMPUR, Malaysia — When a
Chinese government vessel took the world by surprise this month when it
announced that it had detected underwater signals that might have come from
the missing Malaysia Airlines plane, China suddenly looked like the hero of
the multinational search effort.... 阅读全帖 |
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发帖数: 1 | 11 In June 2018, Qin was arrested on accusations that he shipped 78 hydrophones
for use in anti-submarine warfare to the Northwestern Polytechnical
University, which is affiliated with the People's Liberation Army.[63][64] |
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w*********s
发帖数: 2136 | 12 Chinese Submarine was not the first on US coast
Sneaking subs into waters off the west coast — its happened before
By Wayne Madsen
The firing of a submarine-launched ballistic missile by a Chinese Jin-class
submarine off the coast of southern California lastMonday at the height of
evening rush hour in Los Angeles was not the first time the U.S. Navy's anti
-submarine warfare sensors in the Pacific have failed.
In 1981, a Soviet Victor-class nuclear submarine successfully evaded the
Navy's Sound ... 阅读全帖 |
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b*s
发帖数: 82482 | 13 来自主题: LeisureTime版 - 孤独的鲸鱼 杜撰故事而已吧。海洋学家一般不跟踪单独的个体的。不好申请grant。而且，军方也
一般不 share info with academics。这个顶多算是残疾生物个体，而且不遗传，很难
搞到funding研究。
美军在大洋底有很多 hydrophone，对于biologics的声信号很有研究的。 |
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h*h
发帖数: 18873 | 15 看到这个
Science 22 September 2000:
Vol. 289 no. 5487 pp. 2114-2117
DOI: 10.1126/science.289.5487.2114
Report
How Snapping Shrimp Snap: Through Cavitating Bubbles
Abstract
The snapping shrimp (Alpheus heterochaelis) produces a loud snapping sound
by an extremely rapid closure of its snapper claw. One of the effects of the
snapping is to stun or kill prey animals. During the rapid snapper claw
closure, a high-velocity water jet is emitted from the claw with a speed
exceeding cavitation condit... 阅读全帖 |
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