1,720,999 research outputs found
Comments on a systematic uncertainty in the measurement of the neutrino velocity by the OPERA experiment
No full textRecently the OPERA collaboration measured the velocity of neutrinos by measuring the time difference between the creation of a burst of neutrinos at CERN and the annihilation of one of these neutrinos at the OPERA detector. The method relies on the assumption, that each of the neutrinos created at CERN has the same probability to be detected at OPERA. If this assumption is wrong, then the determination of the neutrino velocity as performed by OPERA is biased
On the mathematical structure of messages and message processing systems
No full textIn this paper we want to explore the prospects for a physics of information. In the first chapter we will summarise the present situation. Chapter 2 demonstrates the present limitations of information processing. Chapter 3 suggests, that these practical limitations might be traced back to limitations in the underlying theoretical concepts. Chapter 4 suggests a more physics oriented way of defining concepts like “program” or “complexity”. Chapter 5 explores, whether the concepts discussed in chapter 4 can be applied to the processing of physical messages, for instance video images. In a first step in chapter 5.1 we note a difference between messages in information theory and physical messages – physical messages can always be finite. In chapter 5.2 we note, that messages can be considered vectors and that already this very simple statement is leading to relevant practical consequences, leading to a new type of OTP cipher. Chapter 5.3 discusses some general mathematical properties of vector spaces and creates a connection between the mathematical concepts and the physical observables (measurement). In chapter 5.4 we try to gain first hints, of how the mathematical structure of the visible world might be used in order to calculate the description of an image to mathematical precision
The linear mirror for solar energy exploitation
No full textWe describe a simple two-dimensional array of plane mirrors operated by only two motors, which collects efficiently Sun light in order to produce electrical power at about the cost; of oil. The system preserves the merits of previous state-of-the-art solar power plants but is simpler and by far less expensive. A first prototype has been operated at the Physics Department of the University of Udine providing a power of 0.56 kW per m(2) of mirror surface in mid November
Open Questions regarding the Desertec Project
No full textRecently, the construction of a large system of concentrating mirrors in the African Desert (Desertec Project) has been proposed at a cost of more than 400 billion €, in order to produce electricity and send it to Europe. In spite of the huge amount of public money to be spent, it has never been shown, that Desertec is of advantage from an economic point of view. Nor has the impact of Desertec on the world climate ever been discussed. In this note we want to arrive at some first results on the economic and ecologic consequences of Desertec
Solar Mirrors for a Sustainable Earthen Housing in the Desert Villages. A Vision for a New Solar Adobe Age in the South of Egypt
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