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http://dbpedia.org/ontology/abstract معيار السيزيوم و معيار ترددي أساسي حيث يتممعيار السيزيوم و معيار ترددي أساسي حيث يتم فيه استعمال امتصاصية الفوتون بين ذرتين سيزيوم-133 ذوي حالة قاعية وبنية فائقة الدقة للتحكم بالتردد الناتج. تم بناء أول ساعة سيزيوم في عام 1955 على يد لويس إيسن في المختبر الفيزيائي الوطني (المملكة المتحدة). تم نشرها عالميا على يد جينروت إم. آر. وينكلر من مرصد البحرية الأمريكية. تعتبر ساعات السيزيوم الذرية أدق معيار للوقت والتردد و يتم استعمالهم كمعيار لتعريف وحدة الثانية وفق النظام الدولي للوحدات (الشكل الحديث للنظام المتري). تم تعريف الثانية على أنها الوقت المستغرف لتحقيق تردد الإشعاع المنتقل بين ذرتين سيزيوم-133 ذوي حالة قاعية وبنية فائقة الدقة في غياب أي مؤثرات خارجية ك المجال المغناطيسي للأرض، حيث أن قيمة هذا التردد ΔνCs هي 919263177 هرتز. تم اختيار هذه القيمة حتى تساوي ثانية السيزيوم حدود مقدرة أدوات القياس في عام 1960. نظراً لعدم وجود قياس آخر يتضمن الوقت بشكل دقيق، كان تأثير التغيير أقل من نسبة عدم التأكد التجريبية المتوفرة في جميع أجهزة القياس الموجودة آنذاك.توفرة في جميع أجهزة القياس الموجودة آنذاك. , 铯钟,又叫原子铯钟,是一种使用铯的精密的计时仪器。其发明者是美国人N·F·拉姆齐(N铯钟,又叫原子铯钟,是一种使用铯的精密的计时仪器。其发明者是美国人N·F·拉姆齐(Norman Foster Ramsey),他也因发明原子铯钟以及提出氢微波激射技术获得了1989年的诺贝尔物理学奖。 1963年13届国际计量大会决定:铯原子Cs133基态的两个超精细能级间跃迁辐射震荡9192631770周所持续的时间为1秒。此定义一直延用至今。 早期的铯原子钟为磁选态原子钟,即依据能级不同的原子的磁矩不同及不同磁矩的原子在磁场中所受力不同来选择处于不同能级的铯原子。 运动方程 a=μ∇H/m, a为铯原子的加速度,H表示磁场强度,∇H为磁场梯度,m为铯原子质量。=μ∇H/m, a为铯原子的加速度,H表示磁场强度,∇H为磁场梯度,m为铯原子质量。 , The caesium standard is a primary frequencThe caesium standard is a primary frequency standard in which the photon absorption by transitions between the two hyperfine ground states of caesium-133 atoms is used to control the output frequency. The first caesium clock was built by Louis Essen in 1955 at the National Physical Laboratory in the UK. and promoted worldwide by Gernot M. R. Winkler of the United States Naval Observatory. Caesium atomic clocks are one of the most accurate time and frequency standards, and serve as the primary standard for the definition of the second in the International System of Units (SI) (the modern form of the metric system). By definition, radiation produced by the transition between the two hyperfine ground states of caesium (in the absence of external influences such as the Earth's magnetic field) has a frequency, ΔνCs, of exactly 9192631770 Hz. That value was chosen so that the caesium second equalled, to the limit of human measuring ability in 1960 when it was adopted, the existing standard ephemeris second based on the Earth's orbit around the Sun. Because no other measurement involving time had been as precise, the effect of the change was less than the experimental uncertainty of all existing measurements. While the second is the only base unit to be explicitly defined in terms of the caesium standard, the majority of SI units have definitions that mention either the second, or other units defined using the second. Consequently, every base unit except the mole and every named derived unit except the coulomb, ohm, siemens, weber, gray, sievert, radian, and steradian have values that are implicitly defined by the properties of the caesium-133 hyperfine transition radiation. And of these, all but the mole, the coulomb, and the dimensionless radian and steradian are implicitly defined by the general properties of electromagnetic radiation.l properties of electromagnetic radiation.
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rdfs:comment معيار السيزيوم و معيار ترددي أساسي حيث يتممعيار السيزيوم و معيار ترددي أساسي حيث يتم فيه استعمال امتصاصية الفوتون بين ذرتين سيزيوم-133 ذوي حالة قاعية وبنية فائقة الدقة للتحكم بالتردد الناتج. تم بناء أول ساعة سيزيوم في عام 1955 على يد لويس إيسن في المختبر الفيزيائي الوطني (المملكة المتحدة). تم نشرها عالميا على يد جينروت إم. آر. وينكلر من مرصد البحرية الأمريكية. إم. آر. وينكلر من مرصد البحرية الأمريكية. , 铯钟,又叫原子铯钟,是一种使用铯的精密的计时仪器。其发明者是美国人N·F·拉姆齐(N铯钟,又叫原子铯钟,是一种使用铯的精密的计时仪器。其发明者是美国人N·F·拉姆齐(Norman Foster Ramsey),他也因发明原子铯钟以及提出氢微波激射技术获得了1989年的诺贝尔物理学奖。 1963年13届国际计量大会决定:铯原子Cs133基态的两个超精细能级间跃迁辐射震荡9192631770周所持续的时间为1秒。此定义一直延用至今。 早期的铯原子钟为磁选态原子钟,即依据能级不同的原子的磁矩不同及不同磁矩的原子在磁场中所受力不同来选择处于不同能级的铯原子。 运动方程 a=μ∇H/m, a为铯原子的加速度,H表示磁场强度,∇H为磁场梯度,m为铯原子质量。=μ∇H/m, a为铯原子的加速度,H表示磁场强度,∇H为磁场梯度,m为铯原子质量。 , The caesium standard is a primary frequencThe caesium standard is a primary frequency standard in which the photon absorption by transitions between the two hyperfine ground states of caesium-133 atoms is used to control the output frequency. The first caesium clock was built by Louis Essen in 1955 at the National Physical Laboratory in the UK. and promoted worldwide by Gernot M. R. Winkler of the United States Naval Observatory.er of the United States Naval Observatory.
rdfs:label 铯钟 , معيار السيزيوم , Caesium standard
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