2,682 research outputs found
Quasi-homogeneous black hole thermodynamics
Although the fundamental equations of ordinary thermodynamic systems are
known to correspond to first-degree homogeneous functions, in the case of
non-ordinary systems like black holes the corresponding fundamental equations
are not homogeneous. We present several arguments, indicating that black holes
should be described by means of quasi-homogeneous functions of degree different
from one. In particular, we show that imposing the first-degree condition leads
to contradictory results in thermodynamics and geometrothermodynamics of black
holes. As a consequence, we show that in generalized gravity theories the
coupling constants like the cosmological constant, the Born-Infeld parameter or
the Gauss-Bonnet constant must be considered as thermodynamic variables
Explaining cross-industry heterogeneity in price stickiness.
This note explains cross industry heterogeneity in the frequency of price adjustment. We use the quasi-maximum approach of Papke and Wooldridge (1996) to avoid the shortcomings of OLS regressions to analyse frequencies. We pay particular attention to the role of costs and market competition in explaining cross-industry differences. We find that prices are stickier the higher the labour cost share and the lower are competition and the intermediate input share.producer prices, frequency of price changes, market competition, cost structure
FLUKA Simulations of Energy Density Deposition from a ILC Bunch in different Spoiler Designs
FLUKA is used to simulate the energy deposition due to a direct bunch impact of the ILC beam in various candidate spoiler designs. The conclusions extracted will contribute to the overall optimisation process and identify areas where additional experimental data would be beneficial
Gravitational repulsive effects in 3D regular black holes
In this work, we consider the effects of repulsive gravity in an invariant
way for four static 3D regular black holes, using the eigenvalues of the
Riemann curvature tensor, the Ricci scalar, and the strong energy conditions.
The eigenvalues of the solutions are non-vanishing asymptotically (in
asymptotically AdS) and increase as the source of gravity is approached,
providing a radius at which the passage from attractive to repulsive gravity
might occur. We compute the onsets and the regions of repulsive gravity and
conclude that the regular behavior of the solutions at the origin of
coordinates can be interpreted as due to the presence of repulsive gravity,
which also turns out to be related with the violation of the strong energy
condition. We showed that in all of the solutions for the allowed region of
parameters, gravity changes its sign, but the repulsive regions only for the
non-logarithmic solution are affected by the mass that generates the regular
black hole. The repulsive regions for the logarithmic solutions are dependent
on electric charge and the AdS length. The implications and physical
consequences of these results are discussed in detail.Comment: 12 pages, 5 figure
Regulation of phosphate transport in proximal tubules
Homeostasis of inorganic phosphate (Pi) is primarily an affair of the kidneys. Reabsorption of the bulk of filtered Pi occurs along the renal proximal tubule and is initiated by apically localized Na+-dependent Pi cotransporters. Tubular Pi reabsorption and therefore renal excretion of Pi is controlled by a number of hormones, including phosphatonins, and metabolic factors. In most cases, regulation of Pi reabsorption is achieved by changing the apical abundance of Na+/Pi cotransporters. The regulatory mechanisms involve various signaling pathways and a number of proteins that interact with Na+/Pi cotransporter
A simple method to estimate the significance level of the catch probability in the catch removal method in riverf ish populations
This work presents a method for estimating the signiÂźcance level of the capture probability when the capture removal
method is used in riverine Âźsh populations. The method is based on adjustment of the linear relationship between capture
probability and an index of capture efÂźcacy. With this method the population size, the statistic 2 and the signiÂźcance level of
the capture probability can be estimated. This is a simple technique which can be applied in the Âźeld at the time of sampling. It
does not require the use of computers and can determine in situ whether the catch is valid to calculate the population density
High magnetomechanical coupling on magnetic microwire for sensors with biological applications
In this letter, we report the experimental work carried out to study and improve the magnetomechanical coupling on magnetic microwires. A good magnetoelastic response, with magnetoelastic coupling factor k=0.43, has been obtained by control of both wire diameter and sample microstructure. The study addresses two following aspects: (a) analysis of the suitability of amorphous magnetoelastic microwire as promising tiny sensor element to be used as wireless biosensors as well as environment detectors. In particular, its potential as liquids viscosity sensor has been confirmed. (b) Study, as the first time in this kind of magnetic microwire, of the effects of nanocrystallization on the sample magnetoelastic behavior
- âŠ