13,311 research outputs found
Criticality of tuning in athermal phase transitions
We experimentally address the importance of tuning in athermal phase
transitions, which are triggered only by a slowly varying external field acting
as tuning parameter. Using higher order statistics of fluctuations, a singular
critical instability is detected for the first time in spite of an apparent
universal self-similar kinetics over a broad range of driving force. The
results as well as the experimental technique are likely to be of significance
to many slowly driven non-equilibrium systems from geophysics to material
science which display avalanche dynamics.Comment: 5 pages, 4 figure
A Characterization of Visibility Graphs for Pseudo-Polygons
In this paper, we give a characterization of the visibility graphs of
pseudo-polygons. We first identify some key combinatorial properties of
pseudo-polygons, and we then give a set of five necessary conditions based off
our identified properties. We then prove that these necessary conditions are
also sufficient via a reduction to a characterization of vertex-edge visibility
graphs given by O'Rourke and Streinu
Dependence of nonlocal Gilbert damping on the ferromagnetic layer type in FM/Cu/Pt heterostructures
We have measured the size effect in nonlocal Gilbert relaxation rate in
FM(t) / Cu (5nm) [/ Pt (2nm)] / Al(2nm) heterostructures, FM = \{
NiFe, CoFeB, pure Co\}. Common behavior is
observed for three FM layers, where the additional relaxation obeys both a
strict inverse power law dependence ,
and a similar magnitude
. As the tested FM layers
span an order of magnitude in spin diffusion length , the
results are in support of spin diffusion, rather than nonlocal resistivity, as
the origin of the effect
Biodegradation of phenol with immobilized Pseuodomonas putida activated carbon packed bio-filter tower
Comparative study on adsorption and simultaneous adsorption and biodegradation (SAB) of phenol using Pseuodomonas putida (MTCC 1194) in a biofilter tower packed with fresh granular activated carbon (GAC) or biological activated carbon (BAC) showed 37% higher breakthrough point in case of SAB. Maximum phenol degradation rate in case of SAB was 120 mg/L.h obtained at flow rate of 7.42 ml/min. Bioregeneration of bed material up to 63% was achieved in 12 h. The phenol degradation by P. putida (MTCC 1194) was immobilized on activated carbon. Higher surface area of activated carbon is suited as supporting materials for microorganism and shows a high adsorptive capacity for phenol. For biodegradation of phenol by P. putida at shake flask level Haldane's growth model fitted the best. Compared to GAC, 21% higher removal of phenol was observed in case of SAB in batch mode.Key words: Biologically activated carbon, bioregeneration, phenol, Pseudomonas putida
Effects of thermal treatments and germination on physico-chemical properties of corn flour
Certain physico-chemical properties including viscoelasticity, crystallinity and maltose content of corn depends on the gelatinization of starch under different treatments. Three different treatments were performed; boiling in water, steam heating, and germination. The effects of gelatinization onviscoelastic property of corn starch were measured and the morphological changes of corn after different treatments were determined by scanning electron microscope (SEM). Various grooves and fissures on the exterior surface of the granules were noticed in the treated sample compared tocontrol. The crystallinity of corn after different treatments was determined by X-ray diffraction studies (XRD). The control showed higher crystallinity than that of thermal treated samples
- …