10,348 research outputs found
Holding Dissapearance in RTD-based Quantizers
Multiple-valued Logic (MVL) circuits are one of the most attractive
applications of the Monostable-to-Multistable transition Logic (MML), and they
are on the basis of advanced circuits for communications. The operation of such
quantizer has two steps : sampling and holding. Once the quantizer samples the
signal, it must maintain the sampled value even if the input changes. However,
holding property is not inherent to MML circuit topologies. This paper analyses
the case of an MML ternary inverter used as a quantizer, and determines the
relations that circuit representative parameters must verify to avoid this
malfunction.Comment: Submitted on behalf of TIMA Editions
(http://irevues.inist.fr/tima-editions
Using Multi-Threshold Threshold Gates in RTD-based Logic Design. A Case Study
The basic building blocks for Resonant Tunnelling Diode (RTD) logic circuits
are Threshold Gates (TGs) instead of the conventional Boolean gates (AND, OR,
NAND, NOR) due to the fact that, when designing with RTDs, threshold gates can
be implemented as efficiently as conventional ones, but realize more complex
functions. Recently, RTD structures implementing Multi-Threshold Threshold
Gates (MTTGs) have been proposed which further increase the functionality of
the original TGs while maintaining their operating principle and allowing also
the implementation of nanopipelining at the gate level. This paper describes
the design of n-bit adders using these MTTGs. A comparison with a design based
on TGs is carried out showing advantages in terms of latency, device counts and
power consumption.Comment: Submitted on behalf of TIMA Editions
(http://irevues.inist.fr/tima-editions
Compensation and speed of advancement in executive careers through the internal and external labor markets by gender
Our study aims at exploring whether
internal and external moves have a different impact on the speed of advancement in
executive careers, identifying gender differences in the influence of both mobility routes
and understanding the impact of speed on compensation inequality.Universidad de Málaga. Campus de Excelencia Internacional AndalucÃa Tech
The central region of the Fornax cluster -- I. A catalog and photometric properties of galaxies in selected CCD fields
We present a photometric catalog (based on V and I photometry) of galaxies in
the central regions of the Fornax galaxy cluster. Our 11 CCD fields cover 0.17
degrees in total. The limiting surface brightness is around 24 mag arsec^-2,
similar to that of Ferguson's (1989, AJ 98, 367) catalog, whereas our limiting
total magnitude is around V = 22 mag, about two magnitudes fainter. It is the
surface brightness limit, however, that prevents us from detecting the
counterparts of the faintest Local Group dwarf spheroidals. The photometric
properties of all objects are presented as a catalog. The properties and fit
parameters of the surface brightness profiles for a sub-sample are presented as
a second catalog (both catalogs are available in electronic form at the CDS).
We can only add 4 new dwarf galaxies to Ferguson's catalog. However, we confirm
that the dwarf galaxies in Fornax follow a similar surface brightness-magnitude
relation as the Local Group dwarfs. They also follow the color (metallicity) -
relation seen in other galaxy clusters. A formerly suspected excess of dwarf
galaxies surrounding the central cD galaxy NGC 1399 can finally be ruled out.
An enhanced density of objects around NGC 1399 can indeed be seen, but it
appears displaced with respect to the central galaxy and is identified as a
background cluster at z = 0.11 in Paper II of these series, which will discuss
spectroscopic results for our sample.Comment: 15 pages, LaTeX2e, uses aa.cls, including 10 PostScript figures, 1
additional gif figure; accepted for publication in A&AS, also available at
http://www.astro.puc.cl/~mhilker/publication.htm
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