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Zotin K. -H. Chu

Publications and source records attributed to Zotin K. -H. Chu.

16 recordsLinked to original sources
arXiv2010

Possible Frictionless Regime for Ultra-High Temperature Amorphous Matter

The almost frictionless transport of the very-high temperature amorphous matter which resembles the color glass condensate (possibly having much of their origin in the RHIC heavy ion collisions) in a confined annular tube with transversely corrugations is investigated by using the verified transition-rate model and boundary perturbation method. We found that for certain activation volume and energy there exist possible frictionless states which might be associated with the perfect fluid formation during the early expansion stage in RHIC Au+Au collisions. We also address the possible similar scenario in LHC Pb+Pb collisions considering the possible perfect fluid formation in ultra-high temperature transport of amorphous matter.

physics.gen-ph↗
arXiv2010

Possible Frictionless States at Room-Temperature Regime for Many Fermions in Confined Domain

We investigate the possible frictionless transport of many composite (condensed) fermions at room temperature regime along an annular tube with transversely wavy-corrugations by using the verified transition-rate model and boundary perturbation approach. We found that for certain activation volume and energy there exist possible frictionless states at room temperature regime.

physics.gen-ph↗
arXiv2009

Learning of Atomic Physics and Quantum Mechanics : Which should Begin First

What are the differences and similarities between atomic-physics studies at different peoples (Han, Kazak and Uygur perples in the same university) across Xinjiang (a far-west district in PR China which is a border for previous USSR and Kazak)? In this short report we focus on issues relating to the learning style of different-people students to pass the atomic physics course in physics department even the quantum mechanics course has not been taken before.

physics.gen-ph↗
arXiv2009

Gravity-driven Transport along Cylindrical Topological Defects : Possible Dark Matter and Nearly Frictionless States

The gravity-driven flow along an annular topological defect (string) with transversely corrugations is investigated by using the verified transition-rate model and boundary perturbation method. We found that for certain activation volume and energy there exists possible frictionless states which might be associated with the missing momentum of inertia or dark matter.

physics.gen-ph↗
arXiv2009

Possible Dark States induced by a Surface Wave along a Vacuum-Matter Boundary

Possible dark states could be induced after derivations of the entrainment of matter induced by a surface wave propagating along the flexible vacuum-matter boundary by considering the nonlinear coupling between the interface and the rarefaction effect. The nonrelativistic limit of the relativistic Navier-Stokes equations was considered and analytically solved by a perturbation approach. The critical reflux values associated with the product of the second-order body forcing and the Reynolds number (representing the viscous dissipations) decrease as the Knudsen number (representing the rarefaction measure) increases from zero to 0.1. We obtained the critical bounds for possible dark states corresponding to specific Reynolds numbers (ratio of wave inertia and viscous dissipation effects) and wave numbers which might be linked to the dissipative evolution of certain large-scale structure during the relativistic heavy-ion collisions.

physics.gen-ph↗
arXiv2009

Comments on "Effects of wall roughness on flow in nanochannels"

We make remarks on Sofos {\it et al.}'s [{\it Phys. Rev. E} 79, 026305 (2009)] paper. The focus is about the monotonicity of the slip length of which it is different from previous similar numerical simulation. We also offer a possible explanation for this.

physics.gen-ph↗
arXiv2009

Comments on "Slip coefficient in nanoscale pore flow" (arXiv:0805.1666)

We make some remarks on Sokhan and Quirke's [{\it Phys. Rev. E} 78, 015301(R) (2008)] paper (arXiv:0805.1666). Sokhan and Quirke mentioned that, considering their main result, {the slip coefficient is independent of the external force (flux)} which is not consistent with previous measurements and approaches. We also discuss the sudden changes of the slip coefficient for larger Knudsen numbers or smaller nanopores.

physics.gen-ph↗
arXiv2009

Possible Knot-type Time-dependent Quantum-mechanically Dynamical System

We illustrate schematically a possible traversing along the path of trefoil-type and $8_{18}$ knots during a specific time period by considering a quantum-mechanic system which satisfies a specific kind of phase dynamics of quantum mechanics. This result is relevant to the composite particle which is present in the initial or final configuration.

physics.gen-ph↗
arXiv2009

Bifurcating Transport of Glassy Matter Within Annular Micropores

Glassy matter, as subjected to high shear rates, exhibit shear thinning : i.e., the viscosity diminishes with increasing shear rate. Meanwhile one prominent difference between the transport in micropores and that in macroscale is the (relatively) larger roughness observed inside micropores. As the pore size decreases, the surface-to-volume ratio increases and therefore, surface roughness will greatly affect the transport in micropores. By treating the glass as a shear-thinning matter and using the rate-dependent model together with the boundary perturbation method, we can analytically obtain the transport results up to the second order.

physics.gen-ph↗
arXiv2009

Wavy-roughness effect to thermal explosion of materials with power-law thermal absorptivity in microannuli

We obtain the approximate solutions for the steady temperature profiles of materials with a temperature-dependent thermal absorptivity inside a microannulus with wavy-rough surfaces considering a quasilinear partial differential equation by the boundary perturbation approach. We found the critical Frank-Kamanestkii parameter will depend on the small amplitude wavy-roughness.

physics.gen-ph↗
arXiv2009

Theoretical Study for Deformation Kinetics of Glassy Solid Helium within Cylindrical Microtubes

The deformation kinetics for glassy solid helium confined in microscopic domain at very low temperature regime was investigated using a transition-rate model considering the shear thinning behavior which means, once material being subjected to high shear rates, the viscosity diminishes with increasing shear rate. The preliminary results show that there might be nearly frictionless fields for rate of deformation due to the almost vanishing shear stress in microtubes at very low temperature regime subjected to some surface conditions : The relatively larger roughness (compared to the macroscopic domain) inside microtubes and the slip. As the pore size decreases, the surface-to-volume ratio increases and therefore, surface roughness will greatly affect the deformation kinetics in microtubes. By using the boundary perturbation method, we obtained a class of temperature and activation energy dependent fields for the deformation kinetics at low temperature regime with the presumed small wavy roughness distributed along the walls of an cylindrical microtube. The critical deformation kinetics of the glassy matter is dependent upon the temperature, activation energy, activation volume, orientation dependent and is proportional to the (referenced) shear rate, the slip length, the amplitude and the orientation of the wavy-roughness. Finally, we also discuss the quantitative similarity between our results with Ray and Hallock [Phys. Rev. Lett. {\bf 100}, 235301 (2008)].

physics.gen-ph↗
arXiv2009

Population Inversion, Negative Temperature, and Quantum Degeneracies

We revisit the basic principle for lasing : Population inversion which is nevertheless closely linked to the negative temperature state in non-equilibrium thermodynamics. With the introduction of quantum degeneracies, we also illustrate their relationship with the lasing via the tuning of population inversion.

physics.gen-ph↗
arXiv2009

Possible Superfluidity in thin corrugated Annulus

We revisit the persistent flow of a superfluid in a thin wavy-rough annulus. The existence of a phase memory around this thin corrugated annulus is shown to be responsible for the energy minima with a periodic dependence on the total momentum which is directly related to the quantization of circulation. We also illustrate the general features using the ideal Bose gas as an example.

physics.gen-ph↗
arXiv2008

Optical Pumping : Experiment and Theory Revisited

The objective of this paper is to share our enthusiasm for optical pumping experiments and to encourage their use in researches on practical physics. The experimental technique has been well developed and the apparatus sophisticated, but, by paying attention to a few details, reliable operation can be repeated. Some theoretical principles for optical pumping are also introduced and they can be demonstrated experimentally.

physics.gen-ph↗
arXiv2007

Rapid Transport of Glassy Supersolid Helium in Wavy-Rough Nanpores

We show that the presumed wavy roughness distributed along the wall of different nanopores (radius : a around 3.5 nm for Vycor or a silica glass; around 245 nm for porous gold) will induce larger volume flow rates of solid helium (of which there is a minimum) which might explain reported experimental differences of the supersolid fractions observed so far.

physics.gen-ph↗