6,171 research outputs found
Construction of class fields over cyclotomic fields
Let and be odd primes. For a positive integer let be
the ray class field of modulo . We
present certain class fields of such that , and find the degree of explicitly. And we also
construct, in the sense of Hilbert, primitive generators of the field
over by using Shimura's reciprocity law and special values of theta
constants
Ray class fields generated by torsion points of certain elliptic curves
We first normalize the derivative Weierstrass -function appearing in
Weierstrass equations which give rise to analytic parametrizations of elliptic
curves by the Dedekind -function. And, by making use of this
normalization of we associate certain elliptic curve to a given
imaginary quadratic field and then generate an infinite family of ray class
fields over by adjoining to torsion points of such elliptic curve. We
further construct some ray class invariants of imaginary quadratic fields by
utilizing singular values of the normalization of , as the -coordinate
in the Weierstrass equation of this elliptic curve, which would be a partial
result for the Lang-Schertz conjecture of constructing ray class fields over
by means of the Siegel-Ramachandra invariant
The Role of Aesthetic Interaction in Sound Experience
Department of Creative Design EngineeringIn this paper, I examined how Aesthetic Interaction, which plays an important role in HCI, affects the
evaluation of human emotion and product image when applied to products that provide an auditory
experience. For this, I used a Research through Design approach and built a prototype with three elements of
???Aesthetic Interaction???. This could be measured through a self-emotion report, 29SD. The Friedman test also
showed statistically significant results. These results suggest that in designing products that can provide an
auditory experience, we can apply aesthetic interaction to the emotions and images that designers
intentionally project.clos
Au-SN Flip-Chip Solder Bump for Microelectronic and Optoelectronic Applications
As an alternative to the time-consuming solder pre-forms and pastes currently
used, a co-electroplating method of eutectic Au-Sn alloy was used in this
study. Using a co-electroplating process, it was possible to plate the Au-Sn
solder directly onto a wafer at or near the eutectic composition from a single
solution. Two distinct phases, Au5Sn and AuSn, were deposited at a composition
of 30at.%Sn. The Au-Sn flip-chip joints were formed at 300 and 400 degrees
without using any flux. In the case where the samples were reflowed at 300
degrees, only an (Au,Ni)3Sn2 IMC layer formed at the interface between the
Au-Sn solder and Ni UBM. On the other hand, two IMC layers, (Au,Ni)3Sn2 and
(Au,Ni)3Sn, were found at the interfaces of the samples reflowed at 400
degrees. As the reflow time increased, the thickness of the (Au,Ni)3Sn2 and
(Au,Ni)3Sn IMC layers formed at the interface increased and the eutectic
lamellae in the bulk solder coarsened.Comment: Submitted on behalf of TIMA Editions
(http://irevues.inist.fr/tima-editions
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