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preside    音标拼音: [prɪz'ɑɪd] [priz'ɑɪd]
vi. 任主席,统辖,当主人,主持

任主席,统辖,当主人,主持

preside
v 1: act as president; "preside over companies and corporations"

Preside \Pre*side"\, v. i. [imp. & p. p. {Presided}; p. pr. &
vb. n. {Presiding}.] [L. praesidere; prae before sedere to
sit: cf. F. pr['e]sider. See {Sit}.]
1. To be set, or to sit, in the place of authority; to occupy
the place of president, chairman, moderator, director,
etc.; to direct, control, and regulate, as chief officer;
as, to preside at a public meeting; to preside over the
senate.
[1913 Webster]

2. To exercise superintendence; to watch over.
[1913 Webster]

Some o'er the public magazines preside. --Dryden.
[1913 Webster]


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  • Advances in Gamma Ray Astronomy - Purdue University
    What is a Gamma Ray Air Shower? Gamma Ray Air Showers When a gamma ray hits the upper atmosphere it caninteract with the nuclei of an atom and create an electron positron pair
  • Cosmic-ray air showers - Max-Planck-Institut für Kernphysik
    When a primary cosmic ray produces many secondary particles, we call this an air shower When many thousand (sometimes millions or even billions) of particles arrive at ground level, perhaps on a mountain, this is called an extensive air shower (EAS)
  • Cosmic Rays and Extensive Air Showers - Indico
    Hadronic showers develop after the primary nucleus interacts in the medium – will talk about the atmosphere today The neutral pions produced in the interaction (1 3 of all pions) decay to two gamma rays that start electromagnetic showers Other neutral mesons also contribute to the start of electromagnetic showers
  • Characteristics of extensive air showers around the energy threshold . . .
    Ground-based \\(\\gamma \\)-ray astronomy relies on discrimination of \\(\\gamma \\)-rays from the dominant background of cosmic ray protons and nuclei on the basis of air shower characteristics The most obvious differentiating characteristic of hadronic versus purely electromagnetic (EM) cascades is the presence of pions, and subsequent
  • Air Shower Array - ALPACA Experiment
    A primary gamma-ray particle also induces an air shower through electromagnetic reactions in the atmosphere Using an array of detectors on the ground to observe air-shower particles, we can measure the energy and the arrival direction of the primary cosmic-ray particle that induced the air shower, based on the distribution of particle
  • On angular resolution limits for air shower arrays
    The angular resolution limits achievable for perfect ground-based high-altitude gamma-ray air shower detectors are investigated, to serve as benchmarks for the design of real detectors A ‘perfect’ detector is assumed to accurately measure impact position, time and energy of all electromagnetic shower particles reaching the ground
  • Reconstruction of extensive air shower images of the first Large Size . . .
    Ground-based gamma-ray astronomy aims at reconstructing the energy and direction of gamma rays from the extensive air showers they initiate in the atmosphere
  • The KASCADE Air Shower Visualization Project - DePauw University
    The purpose of the project is to provide a visualization of the characteristics of cosmic ray and gamma ray induced air showers Currently, four static plots are generated “Particle Tracks” displays the tracks of the charged particle sin the air shower
  • Detection of cosmic-ray or gamma-ray air showers - Max-Planck-Institut . . .
    Extensive air showers with many particles arriving on the ground can be detected with different kinds of particle detectors Most common are scintillation counters, allowing to measure the time of arrival with high accuracy
  • Energy determination of gamma-ray induced air showers . . . - Springer
    In this paper, we will study the energy determination of gamma-ray showers in the 10-1000 TeV energy region based on the lateral distribution of air showers by Monte Carlo (MC) simulation assuming the present Tibet AS array





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