93,718 research outputs found
All-solid-state radiometers for environmental studies to 700 GHz
We report results with an all-solid-state radiometer for measurements of the ClO molecule at 649 GHz. The project is part of a program to provide low-noise, low-weight, low-power radiometers for space operation, and special effort has been expended on the development of high-efficiency solid-state frequency multipliers and Schottky-barrier mixers with low local oscillator power requirements. The best measured system noise temperature was 1750 K with the mixer and preamplifier cooled to 77 K. The mixer diode was easily pumped into saturation, indicating that the design has excellent prospects of operating at higher frequencies - our present design goal being 1 THz. We comment on the principal design features of such systems and will report on stratospheric measurements performed with this system
Status of the OPERA Experiment
In this article the physics motivation and the detector design of the OPERA
experiment will be reviewed. The construction status of the detector, which
will be situated in the CNGS beam from CERN to the Gran Sasso laboratory, will
be reported. A survey on the physics performance will be given and the physics
plan in 2006 will be presented.Comment: 5 pages, 4 figures, conference proceedings, to be published in Acta
Physica polonica
Subsidiarity and a Free Society: The Subsidiary Role of the State in Catholic Social Teaching
One of the key principles of Catholic social thought is known as the principle of subsidiarity. This tenet holds that nothing should be done by a larger and more complex organisation which can be done by a smaller and simpler organisation. Subsidiarity, understood in this sense, is opposed to forms of centralisation, bureaucratisation, and welfare assistance that deprive citizens of their own responsibility toward themselves, their families, and their societies. Rather, subsidiarity supports personal empowerment and responsibility as much as a proper balance between the public and private spheres, with the resulting recognition of the common good that is inherently achieved through the spontaneous interactions between free and responsible people. Hence, the subsidiarity principle is a bulwark of freedom and it conflicts with all forms of collectivism. It sets the limits for state action
Electron-Cloud Effects in past and future machines - walk through 50 years of Electron-Cloud studies
Past electron-cloud (e-cloud) observations, studies and mitigation techniques
are quickly reviewed along with some ongoing code developments, the preceding
ECLOUD workshops, recent contacts with the spacecraft community, the important
role of Francesco Ruggiero, and a few current electron-cloud topics discussed
at ECLOUD12 in La Biodola.Comment: 9 pages, contribution to the Joint INFN-CERN-EuCARD-AccNet Workshop
on Electron-Cloud Effects: ECLOUD'12; 5-9 Jun 2012, La Biodola, Isola d'Elba,
Ital
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