Takashi Torii ‡ Department of Physics, Tokyo Institute of Technology, Meguro, Tokyo 152, Japan (June 4, 2005) In higher-curvature inflation models (R + αnR ), we study a parametric preheating of a scalar field χ coupled non-minimally to a spacetime curvature R (ξRχ). In the case of R-inflation model, efficient preheating becomes possible for rather small values of ξ, i.e. |ξ|∼ several. Although...

We study in this paper the conversion of CaO-based CO2 sorbents when subjected to repeated carbonation-calcination cycles with a focus on thermally pretreated/doped sorbents. Analytical equations are derived to describe the evolution of conversion with the cycle number from a unifying model based on the balance between surface area loss due to sintering in the looping-calcination stage and surf...

The use of reactors working with a hydrothermal flame as a heat source contributes to overcome many of the challenges presented by supercritical water oxidation (SCWO). Injection of the reagents over a hydrothermal flame can avoid the reagents preheating as the feed can be injected into the reactor at room temperatures, avoiding plugging and corrosion problems in a preheating system. Also the k...

Low temperatures induce limited charging ability and lifespan in lithium-ion batteries, may even cause accidents. Therefore, a reliable preheating strategy is needed to address this issue. This study proposes low-temperature based on neural network PID control, considering temperature increase rate consistency. In strategy, electrothermal films are placed between cells for preheating; battery m...

We discuss toy models where supersymmetry is broken due to a nonvanishing time-varying vacuum expectation value of the inflaton field during preheating. We discuss the production of an inflatino, the superpartner of the inflaton, due to vacuum fluctuations and then we argue that they do not survive until nucleosynthesis and decay along with the inflaton to produce a thermal bath after preheatin...

For nearly a decade it has been known that coherent processes at the end of inflation can drive explosive particle production [1] via parametric resonance, leading to an era of preheating in the post-inflationary universe. Earlier assumptions about the transfer of energy from the inflaton to “regular” matter have been overturned, and the phenomenology of the post-inflationary universe is thus m...

Ceramic gas sensors used for measuring ambient air quality have features suitable for practical applications such as healthcare and air quality management, but have a major drawback-large power consumption to preheat the sensor for accurate measurements. In this paper; the adaptive preheating duration control (APC) method is proposed to reduce the power consumption of ambient air quality sensor...