## Recent Advances in Metrology and Fundamental Constants: Varenna on Lake Como, Villa Monastero, 25 July-4 August 2000Over the last decade of the 20th century, many improvements took place in the field of metrology and fundamental constants. These developments and improvements are discussed in this book. The old caesium SI second definition has found a new realization with the fountain approach, replacing the classical thermal atomic beam. The use of cold atom techniques, slowed down and cooled, has opened a number of unexpected avenues for metrology and fundamental constants, one of these possibilities being the atom interferometry. Another development was the demonstration of the possiblility of performing a direct frequency division in the visible, using short femtosecond pulses. Many other developments are also discussed. |

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### Contents

The XRCD method | 3 |

T J QUINN The organization of metrology | 11 |

MILLS Physical quantities and units | 27 |

S LESCHIUTTA Metrology and the logic of physics | 51 |

B W PETLEY I The fundamental constants and physics | 93 |

pag 575 | 117 |

B W PETLEY II The fundamental constants and metrology | 121 |

B W PETLEY III The Planck constant | 157 |

Definition by a wavelength 19601983 | 455 |

PHYSICS AND FUNDAMENTAL METROLOGY | 495 |

Advances in the establishment of a metric in a measuring device | 523 |

N P Fox Developments in optical radiometry | 537 |

Introduction | 599 |

Tests of the Equivalence Principle | 609 |

Guide | 689 |

SERGIENKO Quantum metrology with entangled photons | 715 |

pag | 177 |

B JECKELMANN The quantum Hall effect and its application in metrology | 263 |

Measurement techniques | 271 |

Dimensional metrologygeneral approach and advances | 759 |

Elenco dei partecipanti | 816 |

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