15,487 research outputs found
Influence of the external pressure on the quantum correlations of molecular magnets
The study of quantum correlations in solid state systems is a large avenue
for research and their detection and manipulation are an actual challenge to
overcome. In this context, we show by using first-principles calculations on
the prototype material KNaCuSiO that the degree of quantum
correlations in this spin cluster system can be managed by external hydrostatic
pressure. Our results open the doors for research in detection and manipulation
of quantum correlations in magnetic systems with promising applications in
quantum information science
CrossCarry: An R package for the analysis of data from a crossover design with GEE
Experimental crossover designs are widely used in medicine, agriculture, and
other areas of the biological sciences. Due to the characteristics of the
crossover design, each experimental unit has longitudinal observations and the
presence of drag effects on the response variable. There is no package in {R}
that clearly models data from crossover designs. The {CrossCarry} package
presented in this paper allows testing any crossover design as long as the
observed response variable belongs to the exponential family, regardless of
whether or not there is a washout period. It also allows modeling repeated
measurements within each period and extends the correlation structures used in
the generalized estimating equations. The family of correlation structures is
built that takes into account the particularities of the design, that is, the
correlation between and within the periods. It also includes a parametric
component for modeling treatment effects and a non-parametric component for
modeling time effects and carry-over effects. The non-parametric component is
estimated from splines inserted into the generalized estimation equations
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