360 research outputs found
Electromagnetic Properties of the Early Universe
Detailed physical processes of magnetic field generation from density
fluctuations in the pre-recombination era are studied. Solving Maxwell
equations and the generalized Ohm's law, the evolutions of the net charge
density, the electric current and the electromagnetic field are solved. Unlike
most of previous works, we treat electrons and photons as separate components
under the assumption of tight coupling. We find that generation of the magnetic
field due to density fluctuations takes place only from the second order of
both perturbation theory and the tight coupling approximation.Comment: 14 pages, no figure, version accepted in Phys. Rev.
The development of corpus-based computer assisted composition program and its application for instrumental music composition
In the last 20 years, we have seen the nourishing environment for the development of
music software using a corpus of audio data expanding significantly, namely that synthesis
techniques producing electronic sounds, and supportive tools for creative activities
are the driving forces to the growth. Some software produces a sequence of sounds by
means of synthesizing a chunk of source audio data retrieved from an audio database
according to a rule. Since the matching of sources is processed according to their descriptive
features extracted by FFT analysis, the quality of the result is significantly
influenced by the outcomes of the Audio Analysis, Segmentation, and Decomposition.
Also, the synthesis process often requires a considerable amount of sample data and
this can become an obstacle to establish easy, inexpensive, and user-friendly applications
on various kinds of devices. Therefore, it is crucial to consider how to treat the
data and construct an efficient database for the synthesis. We aim to apply corpusbased
synthesis techniques to develop a Computer Assisted Composition program, and
to investigate the actual application of the program on ensemble pieces. The goal of
this research is to apply the program to the instrumental music composition, refine its
function, and search new avenues for innovative compositional method
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