ObservationofGravitationalWavesfromaBinaryBlackHoleMerger
B.P.Abbottetal.*
(LIGOScientificCollaborationandVirgoCollaboration)(Received21January2016;published11February2016)
OnSeptember14,2015at09:50:45UTCthetwodetectorsoftheLaserInterferometerGravitational-WaveObservatorysimultaneouslyobservedatransientgravitational-wavesignal.Thesignalsweepsupwardsinfrequencyfrom35to250Hzwithapeakgravitational-wavestrainof1.0×10−21.Itmatchesthewaveformpredictedbygeneralrelativityfortheinspiralandmergerofapairofblackholesandtheringdownoftheresultingsingleblackhole.Thesignalwasobservedwithamatched-filtersignal-to-noiseratioof24andafalsealarmrateestimatedtobelessthan1eventper203000years,equivalenttoasignificancegreater
than5.1σ.Thesourceliesataluminositydistanceof410þ160−180Mpccorrespondingtoaredshiftz¼0.09þ0.03−0.04.
Inthesourceframe,theinitialblackholemassesare36þ5−4M⊙and29þ4−4M⊙,andthefinalblackholemassis62þ4−4M⊙,with3.0þ0.5−0.5M⊙c2radiatedingravitationalwaves.Alluncertaintiesdefine90%credibleintervals.Theseobservationsdemonstratetheexistenceofbinarystellar-massblackholesystems.Thisisthefirstdirectdetectionofgravitationalwavesandthefirstobservationofabinaryblackholemerger.
1 .They are regarded as electrons moving backward in time.
它们被认为是逆着时间而运动的负电子。
2. As he is a skillful operator, he should be able to work on both the boiler and turbo-generator.
作为熟练的操作人员，他应当能够运行蒸汽机和涡轮发电机。
3. You can run Alaqua's evaporators on steam with high thermal economy, on hot oil or on
compressors.
阿拉卡蒸发器可以靠高热能效的蒸汽工作，也可靠热油或压缩机工作。
4. Far from increasing the reaction rate, high temperatures decrease it.
高温非但不会提高反应速率，反而降低速率。
5. If two objects differ in brightness by a factor of 20 or 30, they cannot be photographed on the
same plate.
如果两个物体的亮度相差20到30倍，则不能拍摄在同一张底片上。
6. In this cell the light incident on the sensitive surface of the cell causes the photo-electric
emission of electrons from the surface, and these electrons are attracted to the other electrode.
在这种电池中，照在电池光敏表面的光引起表面光电效应而发射电子，而这些电子被吸引到另一电极。
等响曲线的特点
Equal loudness contours, also known as "Fletcher-Munson curves,"
describe the relationship between sound pressure level and
perceived loudness. These curves show that the human ear does not
respond linearly to changes in sound intensity. In other words, two
sounds with the same physical intensity may be perceived as being
of different loudness. This non-linear relationship is crucial for
understanding how we perceive sound and how we can design audio
systems that provide a consistent listening experience across
different frequencies.
等响曲线描绘了声压级与感知响度之间的关系，也被称为“弗莱彻-芒森曲线”，显示了人耳对声音强度变化的非线性响应。换句话说，两个具有相同物理强度的声音可能被感知为不同的响度。这种非线性关系对于理解我们如何感知声音以及如何设计可以在不同频率下提供一致听觉体验的音频系统至关重要。
One of the key characteristics of equal loudness contours is that they
are frequency-dependent. This means that the perceived loudness of
frequency用法
"Frequency" 是一个英语单词，可以用作名词或形容词，具体用法取决于上下文。以下是一些常见的用法：
名词用法：
1. 频率：
- 例句：The frequency of earthquakes in this region is quite high.
（这个地区的地震频率相当高。）
2. 广泛发生的事物或事件：
- 例句：I check my email with great frequency.
（我经常查看我的电子邮件。）
3. 广播或电波的频率：
- 例句：The radio station broadcasts on a frequency of 102.5 MHz.
（这个广播电台的频率是102.5兆赫兹。）
形容词用法：
1. 频繁的：
- 例句：He has a high frequency of travel due to his job.
（由于工作的关系，他经常出差。）
2. 定期的：
- 例句：We have regular meetings to discuss the project's progress and address any issues
that arise with some frequency.
（我们定期开会讨论项目的进展，并定期解决出现的问题。）
总的来说，"frequency" 这个词在不同语境中可以表示事件发生的次数，事物发生的规律性，或者波的频率等概念。
