4,941 research outputs found
Five new records of coastal fishes from São Tomé Island
We report the presence of five fish species at São Tomé Island, which have not yet
been described from there, and clarify the status of two unidentified species in a checklist
published previously. Two of these species are amphi-Atlantic and the other five are only
known from the coast of West-Africa.info:eu-repo/semantics/publishedVersio
Morphological regions and oblique incidence dot formation in a model of surface sputtering
We study solid surface morphology created by off-normal ion-beam sputtering
with an atomistic, solid-on-solid model of sputter erosion. With respect to an
earlier version of the model, we extend this model with the inclusion of
lateral erosion. Using the 2-dimensional structure factor, we found an upper
bound , in the lateral straggle , for clear ripple formation.
Above this upper bound, for longitudinal straggle , we found
the possibility of dot formation (without sample rotation). Moreover, a
temporal crossover from a hole topography to ripple topography with the same
value of collision cascade parameters was found. Finally, a scaling analysis of
the roughness, using the consecutive gradient approach, yields the growth
exponents and 0.67 for two different topographic regimes.Comment: 8 pages, 14 figure
Possible indicators for low dimensional superconductivity in the quasi-1D carbide Sc3CoC4
The transition metal carbide Sc3CoC4 consists of a quasi-one-dimensional (1D)
structure with [CoC4]_{\inft} polyanionic chains embedded in a scandium
matrix. At ambient temperatures Sc3CoC4 displays metallic behavior. At lower
temperatures, however, charge density wave formation has been observed around
143K which is followed by a structural phase transition at 72K. Below T^onset_c
= 4.5K the polycrystalline sample becomes superconductive. From Hc1(0) and
Hc2(0) values we could estimate the London penetration depth ({\lambda}_L ~=
9750 Angstroem) and the Ginsburg-Landau (GL) coherence length ({\xi}_GL ~= 187
Angstroem). The resulting GL-parameter ({\kappa} ~= 52) classifies Sc3CoC4 as a
type II superconductor. Here we compare the puzzling superconducting features
of Sc3CoC4, such as the unusual temperature dependence i) of the specific heat
anomaly and ii) of the upper critical field H_c2(T) at T_c, and iii) the
magnetic hysteresis curve, with various related low dimensional
superconductors: e.g., the quasi-1D superconductor (SN)_x or the 2D
transition-metal dichalcogenides. Our results identify Sc3CoC4 as a new
candidate for a quasi-1D superconductor.Comment: 4 pages, 5 figure
Influence of Dilution upon Cation Exchange Equilibrium
Ion exchange equilibria in batch systems have been examined to see how the distribution of ions between the ion exchanger and the solution depends on the dilution of the solution. The exchanger was Amberlite IR-120. The following exchanges were studied· K +-H+ Mg++-Ca ++ Ca++ -H+ Ba++ -H+ Ce3 +-H+ and La3 + H+. It has been found that dilution of the system causes the ion of higher affinity to pass into the resin phase. This effect is more pronounced for the exchange of ions of unequal charge than for those of the same charge
Paramagnetic anisotropic magnetoresistance in thin films of SrRuO3
SrRuO3 is an itinerant ferromagnet and in its thin film form when grown on
miscut SrTiO3 it has Tc of ~ 150 K and strong uniaxial anisotropy. We measured
both the Hall effect and the magnetoresistance (MR) of the films as a function
of the angle between the applied field and the normal to the films at
temperatures above Tc. We extracted the extraordinary Hall effect that is
proportional to the perpendicular component of the magnetization and thus the
MR for each angle of the applied field could be correlated with the magnitude
and orientation of the induced magnetization. We successfully fit the MR data
with a second order magnetization expansion, which indicates large anisotropic
MR in the paramagnetic state. The extremum values of resistivity are not
obtained for currents parallel or perpendicular to the magnetization, probably
due to the crystal symmetry.Comment: 3 pages, 3 figure
Studi Gaya Desain Posmodern pada Interior Food Court Galaxy Mall di Surabaya
A food court is an important public facilty in a shopping centre. Apart from its generally large capacity and variety of cuisine served, the design of most foodcourts are also generally attractive.Their interior designs are able to affect the atmoshphere and mood of visitors.Many foodcourts in today's malls adopt the postmodern style in their design, for instance, the Galaxy Mall in Surabaya, which will be the object for case study in this research. The objective of this research is to investigate the implementation of the Post modern style in the interior elements of the food court that will be discussed in detail. The research findings show that the use of Post modern style can be seen in the spatial arrangement, interior elements such as floors, walls and ceilings, furnitures as well as decorative elements such as colour and material. All these elements adopted the Post Modern style in terms of ideology, concept, aim as well as design methodology. The concept of Contradiction has been applied in the two areas of the food court
Recommended from our members
A Portfolio approach to wind and solar deployment in Australia
We develop a new framework that can be used to analyse interactions between solar and wind generation using a Mean-Variance Portfolio Theory (MPT) framework. We use this framework to understand the role of electricity transmission integrating a high shar
Construction of Self-Dual Integral Normal Bases in Abelian Extensions of Finite and Local Fields
Let be a finite Galois extension of fields with abelian Galois group
. A self-dual normal basis for is a normal basis with the
additional property that for .
Bayer-Fluckiger and Lenstra have shown that when , then
admits a self-dual normal basis if and only if is odd. If is an
extension of finite fields and , then admits a self-dual normal
basis if and only if the exponent of is not divisible by . In this
paper we construct self-dual normal basis generators for finite extensions of
finite fields whenever they exist.
Now let be a finite extension of \Q_p, let be a finite abelian
Galois extension of odd degree and let \bo_L be the valuation ring of . We
define to be the unique fractional \bo_L-ideal with square equal to
the inverse different of . It is known that a self-dual integral normal
basis exists for if and only if is weakly ramified. Assuming
, we construct such bases whenever they exist
- …