Various heat treatments are applied to improve the mechanical properties of steels depending on intended use. In this study, variation fatigue strength H13 hot work tool steel with treatment in a GS 550 bath was investigated. It investigated by applying four different as first preheating, second hardening and hardening. Each batch samples subjected rotating bending test at room temperature afte...

We discuss the recent scenario of tachyonic preheating at the end of inflation as a consequence of a tachyonic mass term in the scalar field responsible for spontaneous symmetry breaking. We use 3D lattice simulations to expore this very non-perturbative and non-linear phenomenon, which occurs due to the spinodal instability of the scalar field. Tachyonic preheating is so efficient that symmetr...

The formation of regular patterns is a well-known phenomenon in condensed matter physics. Systems that exhibit pattern formation are typically driven and dissipative with pattern formation occurring in the weakly nonlinear regime and sometimes even in more strongly nonlinear regions of parameter space. In the early universe, parametric resonance can drive explosive particle production called pr...

In the study, a potentially feasible low-NOx combustion technology, based on self-sustained preheating of pulverized coal, is proposed. A 2 MW novel test rig was employed, and bituminous coal used in experiment. internal fluidized bed combustor (IFBC) as chamber for followed by air staging chamber. Preheating characteristics IFBC temperature distribution primary zone were discussed. Next, effec...

We consider the interaction between perturbations in the inflaton and in the metric during the preheating phase in simple inflationary models. By numerically integrating the Einstein field equations we are able to gauge the impact of non-linear gravitational effects on preheating for the first time. In the λφ model we find a large increase in the amplitude of sub-Hubble metric modes, beyond tha...

A significant portion of the energy consumed by home appliances that uses hot water is used for heating cold supply water. Such home appliances generally use supply water at a temperature lower than the ambient temperature. Thus, the water is normally heated from below the ambient temperature to its designed maximum temperature by the appliance, often using natural gas or an electrical heater. ...

The SAGD start-up process normally circulates steam in both the injector and producer, which consumes a large amount of steam, requires high cost high-temperature-produced liquid treatment, unavoidably results preferential communication heterogeneous reservoirs. In order to achieve uniform preheat full chamber development wellpairs, downhole electrical heating start up was proposed investigated...

Enhancement of solar-to-electric efficiency in future solar power tower (SPT) plants will require an improvement the cycle performance. An attractive option is use a supercritical CO2 Brayton cycle, which needs heat transfer fluid (HTF) temperature around 700 °C to be competitive. However, current HTF employed SPT plants, i.e. nitrate salt, cannot reach this target. For reason, new HTFs with la...

In this paper, a heat-flow coupling model of laser welding at preheating temperature was established by the FLUENT 19.0 software. The fluctuation keyhole wall and melt flow behavior in molten pool under different temperatures were analyzed, correlation between with spatters bubbles obtained. results indicate that when outer middle rear is convex, inner concave, which causes spatter or bottom to...