No abstract available

No abstract available

No abstract available

[en] Thermodynamic processes discussed in textbooks are typically presented in the P-V diagram and limited to familiar processes such as isobaric, isochoric, isothermal, and adiabatic. The purpose of this qualitative research was to explore students’ reasoning in analyzing temperature from given P-V diagram representing thermodynamics processes that do not belong to one of those familiar processes. We interviewed 6 students as the volunteers. The interview was guided by two P-V diagrams. First, students dealt with a process that was similar to but different from isothermal or adiabatic. Second, students dealt with a process which the pressure decreased linearly with volume. We also asked the students to convert the P-V diagram into the T-V diagram. We found that the students tended to use the surface features of the diagrams, instead of applying PV=nRT appropriately. For example, they tended to think of a curved P-V diagram as an isothermal or adiabatic process, and in interpreting a linear P-V diagram they tended to think temperature must be constant if the pressure decreases linearly with volume. The students also failed to convert the P-V diagram to the T-V diagram due to the lack of idea and mathematical skill to solve the problem. (paper)

[en] In our recent work we showed, by investigating the initialization of some unusual forms of assisted driving Hamiltonians, that the addition of an assisted driving Hamiltonian is not always useful in quantum adiabatic evolution. These unusual forms are those that are not the relatively fixed ones that are widely used in the literature. In this paper, we continue this study, providing further evidence for the validity of the conclusion above by researching some relatively more complex forms of assisted driving scheme, which generalize the ones studied in our previous work. (paper)

[en] The model of a thermo-inelastic solid undergoing a very fast deformation is considered beyond the usual linear approximation. It is shown, via a stability analysis of small fluctuations, that a universal stability diagram in control parameter space exists exhibiting a complex topology but only hard-mode (acousticlike) instabilities, due to the hyperbolic nature of the governing equations. It turns out that an adiabatic homogeneous expansion against cohesion forces is no longer possible if a critical strain rate is exceeded, leading to spatial symmetry breaking towards fracture. The validity of this last result is thought to hold qualitatively irrespectively of the nature of the dissipation laws

[en] The problem of shock wave emergence to the boundary of a gas is considered. The characteristics of the self-similar solution for adiabatic indices γ=1.1-2.0 and n=0.1-15 (n being the exponent in the gas density distribution rho infinity xsup(n)) are calculated. The modification of approximate Whitham formula for a more accurate determination of the self-similarity exponent is proposed

[en] An expression is found that relates the initial and final volumes and temperatures for any adiabatic process. It is given in terms of a parameter r that smoothly interpolates between a free adiabatic expansion (r = 0) and a quasi-static one (r = 1). The parameter has to be evaluated numerically, but an approximate expression is given

[en] A shortcut to the adiabatic process is an effective method for quantum information processing. The fast and robust quantum information transfer can be implemented by this method. The energetic cost is an important measurement for the shortcut. In this paper, we investigate how to inhibit the energetic cost in stimulated Raman shortcut-to-adiabatic passage in a three-level system. The energetic cost can be manipulated by adjusting detuning of the system and the energetic cost takes the minimum with one-photon resonance condition. (paper)

[en] In this paper, we attempt to give a sufficient condition of guaranteeing the validity of the proof of the quantum adiabatic theorem. The new sufficient condition can clearly remove the inconsistency and the counterexample of the quantum adiabatic theorem pointed out by Marzlin and Sanders [Phys. Rev. Lett. 93 (2004) 160408]. (general)