5,003 research outputs found
Sea ice working group (SIP)
The sea ice is a crucial component of
the polar climate system, and has
an impact on albedo, heat and gas ex-
change, primary productivity and car-
bon export, atmospheric and ocean
circulation, freshwater budget, ocean
stratification, and deep water mass for-
mation. It is therefore critical that it is
correctly specified as a forcing or pre-
dicted as a feedback in modeling stud-
ies
Solid Surface Structure Affects Liquid Order at the Polystyrene/SAM Interface
We present a combined x-ray and neutron reflectivity study characterizing the
interface between polystyrene (PS) and silanized surfaces. Motivated by the
large difference in slip velocity of PS on top of dodecyl-trichlorosilane (DTS)
and octadecyl-trichlorosilane (OTS) found in previous studies, these two
systems were chosen for the present investigation. The results reveal the
molecular conformation of PS on silanized silicon. Differences in the molecular
tilt of OTS and DTS are replicated by the adjacent phenyl rings of the PS. We
discuss our findings in terms of a potential link between the microscopic
interfacial structure and dynamic properties of polymeric liquids at
interfaces
3D Spin Glass and 2D Ferromagnetic XY Model: a Comparison
We compare the probability distributions and Binder cumulants of the overlap
in the 3D Ising spin glass with those of the magnetization in the ferromagnetic
2D XY model. We analyze similarities and differences. Evidence for the
existence of a phase transition in the spin glass model is obtained thanks to
the crossing of the Binder cumulant. We show that the behavior of the XY model
is fully compatible with the Kosterlitz-Thouless scenario. Finite size effects
have to be dealt with by using great care in order to discern among two very
different physical pictures that can look very similar if analyzed without
large attention.Comment: 14 pages and 6 figures. Also available at
http://chimera.roma1.infn.it/index_papers_complex.htm
Spin-orbit coupled particle in a spin bath
We consider a spin-orbit coupled particle confined in a quantum dot in a bath
of impurity spins. We investigate the consequences of spin-orbit coupling on
the interactions that the particle mediates in the spin bath. We show that in
the presence of spin-orbit coupling, the impurity-impurity interactions are no
longer spin-conserving. We quantify the degree of this symmetry breaking and
show how it relates to the spin-orbit coupling strength. We identify several
ways how the impurity ensemble can in this way relax its spin by coupling to
phonons. A typical resulting relaxation rate for a self-assembled Mn-doped ZnTe
quantum dot populated by a hole is 1 s. We also show that decoherence
arising from nuclear spins in lateral quantum dots is still removable by a spin
echo protocol, even if the confined electron is spin-orbit coupled.Comment: 18 pages, 1 figur
A new baculovirus isolate that does not cause the liquefaction of the integument in Spodoptera frugiperda dead larvae.
The large-scale production of Baculovirus to control fall armyworm, Spodoptera frugiperda, presents many limitations. The most important limiting factor is that the baculovirus, which infects fall armyworm, causes liquefaction of the integument immediately after death. This disruption of the integument difficultates the large scale production because dead insect must be frozen before being harvested. This fact implies in high lab work need, increasing the cost of the biopesticide. This problem was overcome by the discovery of a new baculovirus nucleopolyhedrovirus (NPV) isolate in Cascavel/PR, that doesn?t cause liquefaction of the integument (isolate 6NR) immediately after the insect death. This is an extremely important factor in a large-scale baculovirus production. In addition, mortality caused by isolate 6NR on 6-day-old-larvae was above 93% (SEM=0.7%), the average weight dead larva was 116.21 mg (SEM=22.9), the larval equivalent and weight equivalent/ha were 15.04 g (SEM=1.2) and 140.32 larvae (SEM=20.1), respectively
Ising Model Coupled to Three-Dimensional Quantum Gravity
We have performed Monte Carlo simulations of the Ising model coupled to
three-dimensional quantum gravity based on a summation over dynamical
triangulations. These were done both in the microcanonical ensemble, with the
number of points in the triangulation and the number of Ising spins fixed, and
in the grand canoncal ensemble. We have investigated the two possible cases of
the spins living on the vertices of the triangulation (``diect'' case) and the
spins living in the middle of the tetrahedra (``dual'' case). We observed phase
transitions which are probably second order, and found that the dual
implementation more effectively couples the spins to the quantum gravity.Comment: 11 page
Genome of the most widely used viral biopesticide: Anticarsia gemmatalis multiple nucleopolyhedrovirus.
Transition Matrix Monte Carlo Reweighting and Dynamics
We study an induced dynamics in the space of energy of single-spin-flip Monte
Carlo algorithm. The method gives an efficient reweighting technique. This
dynamics is shown to have relaxation times proportional to the specific heat.
Thus, it is plausible for a logarithmic factor in the correlation time of the
standard 2D Ising local dynamics.Comment: RevTeX, 5 pages, 3 figure
Identificação em mistura de piperamidas em folhas, caule e raízes de Piper ottonoides por CG-EM e RMN 1D e 2D.
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