8,024 research outputs found
Vapor condensation on a turbulent liquid interface
An experimental investigation which seeks the fundamental relationship between the interfacial condensation rate and the parameters which control it when the liquid side is turbulent is discussed. The scaling laws for free-surface condensation are discussed for this case. It is argued that the condensation of cryogenic liquids can, in principle, be simulated in experiments using steam and water. Data are presented for the condensation rate in terms of the dimensionless scaling parameters which involve the fluid properties and the liquid-side turbulence velocity and length scales
Quantum Walks on Trees with Disorder: Decay, Diffusion, and Localization
Quantum walks have been shown to have impressive transport properties
compared to classical random walks. However, imperfections in the quantum walk
algorithm can destroy any quantum mechanical speed-up due to Anderson
localization. We numerically study the effect of static disorder on a quantum
walk on the glued trees graph. For small disorder, we find that the dominant
effect is a type of quantum decay, and not quantum localization. For
intermediate disorder, there is a crossover to diffusive transport, while a
localization transition is observed at large disorder, in agreement with
Anderson localization on the Cayley tree.Comment: 12 pages, 13 figure
Spatially incoherent modulational instability in a non local medium
We investigate one-dimensional transverse modulational instability in a non
local medium excited with a spatially incoherent source. Employing undoped
nematic liquid crystals in a planar pre-tilted configuration, we investigate
the role of the spectral broadening induced by incoherence in conjunction with
the spatially non local molecular reorientation. The phenomenon is modeled
using the Wigner transform.Comment: 13 pages with 4 figures included. To be published in Laser Physics
Letter
Lipase From Thermoalkalophilic Pseudomonas species as an Additive in Potential Laundry Detergent Formulations
Lipase isolated from a thermoalkalophilic Pseudomonas species was used as additive to improve the degree of olive oil removal from cotton fabric in the presence of surfactants. The lipase used in this study was found to be more effective with non ionic surfactants as compared to ionic surfactants. In terms of stability, there was no decrease in activity found in the presence of Tween 85, Span 80 and Span 20. Lipase from Pseudomonas species was most active in the presence of Tween 85, Span 80 and Span 20. The application of lipase from Pseudomonas species as an additive in the formulation containing Span 80 has improved oil removal by 36% using the washing system consisting 5 U/mL lipase, at 70 °C for 20 min and 0.8% of Span 80 as surfactant. Considering that lipase from Pseudomonas species is stable in high pH and temperatures in the presence of various surfactants, therefore it is suitable to be incorporated as additives in potential detergent formulations
Inferring Safe Maude Programs with \uc1TAME
In this paper, we present \atame, an assertion-based program specialization tool for the multi-paradigm language Maude. The program specializer \atame\ takes as input a set \cA of system assertions that model the expected program behavior plus a Maude program \cR to be specialized that might violate some of the assertions in \cA. The outcome of the tool is a safe program refinement \cR' of \cR in which every computation is a good run, i.e., it satisfies the assertions in \cA. The specialization technique encoded in \atame\ is fully automatic and ensures that no good run of \cR is removed from \cR', while the number of bad runs is reduced to zero. We demonstrate the tool capabilities by specializing an overly general nondeterministic dam controller to fulfill a safety policy given by a set of system assertions
Enhanced soliton interactions by inhomogeneous nonlocality and nonlinearity
We address the interactions between optical solitons in the system with
longitudinally varying nonlocality degree and nonlinearity strength. We
consider a physical model describing light propagation in nematic liquid
crystals featuring a strongly nonlocal nonlinear response. We reveal that the
variation of the nonlocality and nonlinearity along the propagation direction
can substantially enhance or weaken the interaction between out-of-phase
solitons. This phenomenon manifests itself as a slowdown or acceleration of the
soliton collision dynamics in one-dimensional geometries or of the soliton
spiraling rate in bulk media. Therefore, one finds that by engineering the
nonlocality and nonlinearity variation rate one can control the output soliton
location.Comment: 22 pages, 5 figures, to appear in Physical Review
A Study of Quality Assurance Practices in the Universiti Sains Malaysia (USM), Malaysia
This article looks at the quality assurance practices amongst three (3) groups of
staff in the School of Distance Education, Universiti Sains Malaysia, i.e. lecturers,
resident tutors and support staff. 9 dimensions of the Quality Assurance
Practices i.e. Staff Development, Planning, Work Process, Team Work, Prioritise
Customers, Performance Evaluation, System For Sending Of Learning Materials,
System For Receiving Of Assignments From Students and Management of
Students’ Records are identified in this study. The results show that quality
assurances practices amongst three groups are different. Profile Analysis used in
this research shows that quality assurance practices amongst lecturers and
support staff are parallel. Results also show that quality assurance practices of
resident tutors have profiles that differ from the lecturers and support staff
ROI–Based Tamper Detection And Recovery For Medical Images Using Reversible Watermarking Technique.
Digital image watermarking is proposed to overcome the problems of security, capacity and cost in health care management systems
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