9,255 research outputs found
Nature-inspired Cuckoo Search Algorithm for Side Lobe Suppression in a Symmetric Linear Antenna Array
In this paper, we proposed a newly modified cuckoo search (MCS) algorithm integrated with the Roulette wheel selection operator and the inertia weight controlling the search ability towards synthesizing symmetric linear array geometry with minimum side lobe level (SLL) and/or nulls control. The basic cuckoo search (CS) algorithm is primarily based on the natural obligate brood parasitic behavior of some cuckoo species in combination with the Levy flight behavior of some birds and fruit flies. The CS metaheuristic approach is straightforward and capable of solving effectively general N-dimensional, linear and nonlinear optimization problems. The array geometry synthesis is first formulated as an optimization problem with the goal of SLL suppression and/or null prescribed placement in certain directions, and then solved by the newly MCS algorithm for the optimum element or isotropic radiator locations in the azimuth-plane or xy-plane. The study also focuses on the four internal parameters of MCS algorithm specifically on their implicit effects in the array synthesis. The optimal inter-element spacing solutions obtained by the MCS-optimizer are validated through comparisons with the standard CS-optimizer and the conventional array within the uniform and the Dolph-Chebyshev envelope patterns using MATLABTM. Finally, we also compared the fine-tuned MCS algorithm with two popular evolutionary algorithm (EA) techniques include particle swarm optimization (PSO) and genetic algorithms (GA)
The prediction of wake wash in the towing tank
The wash or ship-generated waves from high speed craft has become a common subject in research and development of marine transportation. Since some time now the wake wash of high speed craft has become a problem in particular on inland or confined waterways. This wake wash has an impact on safety and environment such as bank/shoreline erosion, risk to people on shore and small boats in harbors and changes in the local ecology. This paper describes the results of model test of a high speed patrol, together with theoretical prediction of wake wash
Multi-Agent System Interaction in Integrated SCM\ud
Coordination between organizations on strategic, tactical and operation levels leads to more effective and efficient supply chains. Supply chain management is increasing day by day in modern enterprises.. The environment is becoming competitive and many enterprises will find it difficult to survive if they do not make their sourcing, production and distribution more efficient. Multi-agent supply chain management has recognized as an effective methodology for supply chain management. Multi-agent systems (MAS) offer new methods compared to conventional, centrally organized architectures in the scope of supply chain management (SCM). Since necessary data are not available within the whole supply chain, an integrated approach for production planning and control taking into account all the partners involved is not feasible. In this study we show how MAS architecture interacts in the integrated SCM architecture with the help of various intelligent agents to highlight the above problem
Superfluid Field response to Edge dislocation motion
We study the dynamic response of a superfluid field to a moving edge
dislocation line to which the field is minimally coupled. We use a dissipative
Gross-Pitaevskii equation, and determine the initial conditions by solving the
equilibrium version of the model. We consider the subsequent time evolution of
the field for both glide and climb dislocation motion and analyze the results
for a range of values of the constant speed of the moving dislocation. We
find that the type of motion of the dislocation line is very important in
determining the time evolution of the superfluid field distribution associated
with it. Climb motion of the dislocation line induces increasing asymmetry, as
function of time, in the field profile, with part of the probability being, as
it were, left behind. On the other hand, glide motion has no effect on the
symmetry properties of the superfluid field distribution. Damping of the
superfluid field due to excitations associated with the moving dislocation line
occurs in both cases.Comment: 10 pages 7 figures. To appear in Phys. Rev
Dislocation Mobility and Anomalous Shear Modulus Effect in He Crystals
We calculate the dislocation glide mobility in solid He within a model
that assumes the existence of a superfluid field associated with dislocation
lines. Prompted by the results of this mobility calculation, we study within
this model the role that such a superfluid field may play in the motion of the
dislocation line when a stress is applied to the crystal. To do this, we relate
the damping of dislocation motion, calculated in the presence of the assumed
superfluid field, to the shear modulus of the crystal. As the temperature
increases, we find that a sharp drop in the shear modulus will occur at the
temperature where the superfluid field disappears. We compare the drop in shear
modulus of the crystal arising from the temperature dependence of the damping
contribution due to the superfluid field, to the experimental observation of
the same phenomena in solid He and find quantitative agreement. Our results
indicate that such a superfluid field plays an important role in dislocation
pinning in a clean solid He at low temperatures and in this regime may
provide an alternative source for the unusual elastic phenomena observed in
solid He.Comment: 17 pages, 2 figures. To appear in JLT
Hydrodynamics of compressible superfluids in confined geometries
We present a study of the hydrodynamics of compressible superfluids in
confined geometries. We use a perturbative procedure in terms of the
dimensionless expansion parameter where is the typical speed of
the flow and the speed of sound. A zero value of this parameter
corresponds to the incompressible limit. We apply the procedure to two specific
problems: the case of a trapped superfluid with a gaussian profile of the local
density, and that of a superfluid confined in a rotating obstructed cylinder.
We find that the corrections due to finite compressibility which are, as
expected, negligible for liquid He, are important but amenable to the
perturbative treatment for typical ultracold atomic systems.Comment: 17 pages, including 7 figures. To appear in Journ. Phys.
Ising Model on a random network with annealed or quenched disorder
We study the equilibrium properties of an Ising model on a disordered random
network where the disorder can be quenched or annealed. The network consists of
four-fold coordinated sites connected via variable length one-dimensional
chains. Our emphasis is on nonuniversal properties and we consider the
transition temperature and other equilibrium thermodynamic properties,
including those associated with one dimensional fluctuations arising from the
chains. We use analytic methods in the annealed case, and a Monte Carlo
simulation for the quenched disorder. Our objective is to study the difference
between quenched and annealed results with a broad random distribution of
interaction parameters. The former represents a situation where the time scale
associated with the randomness is very long and the corresponding degrees of
freedom can be viewed as frozen, while the annealed case models the situation
where this is not so. We find that the transition temperature and the entropy
associated with one dimensional fluctuations are always higher for quenched
disorder than in the annealed case. These differences increase with the
strength of the disorder up to a saturating value. We discuss our results in
connection to physical systems where a broad distribution of interaction
strengths is present.Comment: 11 pages including 9 figures. To appear in Phys. Rev.
Financial Development and Economic Growth: Evidence from a Heterogeneous Panel of High Income Countries
This paper examines the empirical relationship between financial development and economic growth for high income countries. The study focuses on both indirect finance and direct finance, separately as well as jointly. Applying the methodology of Nair-Reichert and Weinhold (2001) for causality analysis in heterogeneous panel data, two sets of results are reported. First, the evidence regarding the relationship between financial development and economic growth from a contemporaneous non-dynamic fixed effects panel estimation is mixed. Negative and statistically significant estimates of the coefficient of the inflation and financial development interaction variable indicate that financial sector development may even be harmful to economic growth when inflation is rising. Second, in contrast with the recent evidence of Beck and Levine (2003), heterogeneous panel causality analysis applied on a refined model indicates that there is no definite evidence that finance spurs economic growth or growth spurs finance. Most of our findings are in line with the Lucas (1988) view that the importance of financial matters is over-stressed. The only exception is the case of activity in stock markets where our result supports the Robinson (1952) view that finance follows enterprise.
Subcritical and supercritical fluid extraction a critical review of its analytical usefulness
Subcritical R134a is suggested as a low-pressure alternative to supercritical CO2 in the supercritical fluid extraction technology in particular of palm oil application. Therefore, a measurement of solubility of palm oil in subcritical Rl34a will be carried out at temperatures of 40, 60, 70 and 80°C and pressures up to 300 bar. The solubility of carotene are also will be measured using UV Spectrophotometer. Results obtained from this study will be compared with the previous work and for the first time, simulation for the SFE process of palm oil will be performed using Artificial Neural Network (ANN) and it will be implemented in comparisons as well when the operating conditions of the previous findings are different from this study. It is expected that the solubility of the palm oil in subcritical Rl34a is much higher than SC-C02, and it is expected that R134a could be a viable alternative solvent to supercritical carbon dioxide as R134a could be perform well at a lower pressure used whereas can achieved a higher solubility compared to SC-C0
A bridgeless Cuk PFC converter
A bridgeless Power Factor Correction (PFC) circuit based on Cuk converter is proposed in this paper. The operation during each sub-interval modes of the converter operated in Discontinuous Conduction Mode (DCM) is discussed. The smallsignal and large signal models are presented using Current Injected Equivalent Circuit Approach (CIECA). PLECS/Simulink is used to verify the capability of the proposed converter to regulate the output voltage while the input current regulation is inherent. This converter is capable to operate in universal input voltage condition
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