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  • Artikel  (1.352)
  • Hindawi  (1.352)
  • American Chemical Society
  • Blackwell Publishing Ltd
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  • Molecular Diversity Preservation International
  • Springer Nature
  • Springer Science + Business Media
  • 2020-2022
  • 2010-2014  (1.352)
  • 1960-1964
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  • Journal of Applied Mathematics  (438)
  • Applied and Environmental Soil Science  (16)
  • 110305
  • 9340
  • Mathematik  (1.266)
  • Land- und Forstwirtschaft, Gartenbau, Fischereiwirtschaft, Hauswirtschaft  (86)
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  • Artikel  (1.352)
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  • Hindawi  (1.352)
  • American Chemical Society
  • Blackwell Publishing Ltd
  • Copernicus
  • Molecular Diversity Preservation International
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  • 2020-2022
  • 2010-2014  (1.352)
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  • 1
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    Multipath Adaptive Tabu Search for a Vehicle Control Problem (2012)
    Hindawi
    Details
    Publikationsdatum: 2012-02-24
    Beschreibung: Tabu search has become acceptable worldwide as one of the most efficient intelligent searches applied to various real-world problems. There have been different modifications made to the generic tabu search in recent years to achieve better performances. Among those reviewed in the introduction of this paper, the adaptive tabu search (ATS) has incorporated the backtracking and the adaptive search radius mechanisms that help accelerate the search and release it from a local solution lock. The paper explains an enhancement made to the ATS to accomplish multipath ATS (MATS) algorithms. Performances of the ATS and the MATS are evaluated using surface optimization problems, and results are presented in the paper. Finally, the MATS is applied to solve a real-world vehicle control problem.
    Print ISSN: 1110-757X
    Digitale ISSN: 1687-0042
    Thema: Mathematik
    Publiziert von Hindawi
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  • 2
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    Synchronization of Two Rank-One Chaotic Systems without and with Delay via Linear Delayed Feedback Control (2012)
    Hindawi
    Details
    Publikationsdatum: 2012-03-16
    Beschreibung: This paper illustrates the presence of chaos in rank-one chaotic systems with delay via a binary test (called 0-1 test) for chaos. Chaotic synchronization between two rank-one chaotic systems without and with delay is achieved by means of Lyapunov functional and linear delayed feedback control method. Numerical simulations are implemented to verify the effectiveness of the proposed chaos synchronization scheme.
    Print ISSN: 1110-757X
    Digitale ISSN: 1687-0042
    Thema: Mathematik
    Publiziert von Hindawi
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  • 3
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    On a Generalized Hyers-Ulam Stability of Trigonometric Functional Equations (2012)
    Hindawi
    Details
    Publikationsdatum: 2012-03-16
    Beschreibung: Let G be an Abelian group, let ℂ be the field of complex numbers, and let f,g:G→ℂ. We consider the generalized Hyers-Ulam stability for a class of trigonometric functional inequalities, |f(x-y)-f(x)g(y)+g(x)f(y)|≤ψ(y),  |g(x-y)-g(x)g(y)-f(x)f(y)|≤ψ(y), where ψ:G→ℝ is an arbitrary nonnegative function.
    Print ISSN: 1110-757X
    Digitale ISSN: 1687-0042
    Thema: Mathematik
    Publiziert von Hindawi
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  • 4
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    The Effect of Dissolved Humic Acids on Aluminosilicate Formation and Associated Carbon Sequestration (2012)
    Hindawi
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    Publikationsdatum: 2012-03-16
    Beschreibung: Allophane and imogolite neogenesis in soils may occur in the presence of organic matter. To understand this process under conditions relevant to soils, the influence of dissolved organic carbon (DOC) as humic acid (HA), on aluminosilicate formation was studied at 25C∘, pH 6, and low-DOC concentrations. For solutions with initial Al/Si ratios of 1–2.1, and 0–6 mg/L DOC, precipitates recovered after 20 h had Al/Si ratios of 2.2–2.7. The formation of allophane, imogolite-like material, and aluminosilicate gel was confirmed by XRD, FTIR, and NMR. The effect of DOC was to produce a small, but systematic increase in imogolite-like Si in the precipitate, and a decrease in the formation of aluminosilicate gel. Results suggest that the presence of DOC as HA slows the otherwise rapid polymerization of Al and Si at low temperature, and may also promote the formation of imogolite. The high C content of these precipitates indicates that this process may facilitate the sequestration of organic matter, slowing C cycling in soils.
    Print ISSN: 1687-7667
    Digitale ISSN: 1687-7675
    Thema: Geologie und Paläontologie , Land- und Forstwirtschaft, Gartenbau, Fischereiwirtschaft, Hauswirtschaft
    Publiziert von Hindawi
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  • 5
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    Effect of Land Application of Phosphorus-Saturated Gypsum on Soil Phosphorus in a Laboratory Incubation (2012)
    Hindawi
    Details
    Publikationsdatum: 2012-02-07
    Beschreibung: Agricultural drainage ditches can deliver high loads of phosphorus (P) to surface water. Installation of filter structures containing P sorbing materials (PSMs), including gypsum, is an emerging practice that has shown promise to reduce these P loads. The objective of this study was to evaluate what effect soil amendment with gypsum would have on soil P concentrations and forms in a laboratory incubation experiment. Gypsum was saturated at two levels with P, and applied to a silt loam and a sandy loam at two rates. The treated soils were incubated in the laboratory at 25°C, and samples were collected on eight dates between 0 and 183 days after amendment. Spent gypsum application did not significantly increase soil water-extractable or Mehlich 3 P when applied at typical agronomic rates. This appears to be a viable strategy to remove P from agricultural drainage waters but does not appear to provide any additional P fertilizer value.
    Print ISSN: 1687-7667
    Digitale ISSN: 1687-7675
    Thema: Geologie und Paläontologie , Land- und Forstwirtschaft, Gartenbau, Fischereiwirtschaft, Hauswirtschaft
    Publiziert von Hindawi
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  • 6
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    On the Solution of Double-Diffusive Convective Flow due to a Cone by a Linearization Method (2012)
    Hindawi
    Details
    Publikationsdatum: 2012-02-08
    Beschreibung: The paper details the use of a nonperturbation successive linearization method to solve the coupled nonlinear boundary value problem due to double-diffusive convection from an inverted cone. Diffusion-thermo and thermal-diffusion effects have been taken into account. The governing partial differential equations are transformed into ordinary differential equations using a suitable similarity transformation. The SLM is based on successively linearizing the governing nonlinear boundary layer equations and solving the resulting higher-order deformation equations using spectral methods. The results are compared with the limited cases from previous studies and results obtained using the Matlab inbuilt bvp4c numerical algorithm and a shooting technique that uses Runge-Kutta-Fehlberg (RKF45) and Newton-Raphson schemes. These comparisons reveal the robustness and validate the usage of the linearisation method technique. The results show that the nonperturbation technique in combination with the Chebyshev spectral collocation method is an efficient numerical algorithm with assured convergence that serves as an alternative to numerical methods for solving nonlinear boundary value problems.
    Print ISSN: 1110-757X
    Digitale ISSN: 1687-0042
    Thema: Mathematik
    Publiziert von Hindawi
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  • 7
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    Subsurface Lateral Flow in Texture-Contrast (Duplex) Soils and Catchments with Shallow Bedrock (2012)
    Hindawi
    Details
    Publikationsdatum: 2012-02-09
    Beschreibung: Development-perched watertables and subsurface lateral flows in texture-contrast soils (duplex) are commonly believed to occur as a consequence of the hydraulic discontinuity between the A and B soil horizons. However, in catchments containing shallow bedrock, subsurface lateral flows result from a combination of preferential flow from the soil surface to the soil—bedrock interface, undulations in the bedrock topography, lateral flow through macropore networks at the soil—bedrock interface, and the influence of antecedent soil moisture on macropore connectivity. Review of literature indicates that some of these processes may also be involved in the development of subsurface lateral flow in texture contrast soils. However, the extent to which these mechanisms can be applied to texture contrast soils requires further field studies. Improved process understanding is required for modelling subsurface lateral flows in order to improve the management of waterlogging, drainage, salinity, and offsite agrochemicals movement.
    Print ISSN: 1687-7667
    Digitale ISSN: 1687-7675
    Thema: Geologie und Paläontologie , Land- und Forstwirtschaft, Gartenbau, Fischereiwirtschaft, Hauswirtschaft
    Publiziert von Hindawi
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  • 8
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    MHD Flow of an Incompressible Viscous Fluid through Convergent or Divergent Channels in Presence of a High Magnetic Field (2012)
    Hindawi
    Details
    Publikationsdatum: 2012-02-10
    Beschreibung: The flow of an incompressible electrically conducting viscous fluid in convergent or divergent channels under the influence of an externally applied homogeneous magnetic field is studied both analytically and numerically. Navier-Stokes equations of fluid mechanics and Maxwell’s electromagnetism equations are reduced into highly non-linear ordinary differential equation. The resulting non-linear equation has been solved analytically using a very efficient technique, namely, differential transform method (DTM). The DTM solution is compared with the results obtained by a numerical method (shooting method, coupled with fourth-order Runge-Kutta scheme). The plots have revealed the physical characteristics of flow by changing angles of the channel, Hartmann and Reynolds numbers.
    Print ISSN: 1110-757X
    Digitale ISSN: 1687-0042
    Thema: Mathematik
    Publiziert von Hindawi
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  • 9
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    Hidden and Not So Hidden Symmetries (2012)
    Hindawi
    Details
    Publikationsdatum: 2012-02-13
    Beschreibung: Hidden symmetries entered the literature in the late Eighties when it was observed that there could be gain of Lie point symmetry in the reduction of order of an ordinary differential equation. Subsequently the reverse process was also observed. Such symmetries were termed “hidden”. In each case the source of the “new” symmetry was a contact symmetry or a nonlocal symmetry, that is, a symmetry with one or more of the coefficient functions containing an integral. Recent work by Abraham-Shrauner and Govinder (2006) on the reduction of partial differential equations demonstrates that it is possible for these “hidden” symmetries to have a point origin. In this paper we show that the same phenomenon can be observed in the reduction of ordinary differential equations and in a sense loosen the interpretation of hidden symmetries.
    Print ISSN: 1110-757X
    Digitale ISSN: 1687-0042
    Thema: Mathematik
    Publiziert von Hindawi
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  • 10
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    Analytical and Semi-Analytical Treatment of the Satellite Motion in a Resisting Medium (2012)
    Hindawi
    Details
    Publikationsdatum: 2012-02-13
    Beschreibung: The orbital dynamics of an artificial satellite in the Earth's atmosphere is considered. An analytic first-order atmospheric drag theory is developed using Lagrange's planetary equations. The short periodic perturbations due to the geopotential of all orbital elements are evaluated. And to construct a second-order analytical theory, the equations of motion become very complicated to be integrated analytically; thus we are forced to integrate them numerically using the method of Runge-Kutta of fourth order. The validity of the theory is checked on the already decayed Indian satellite ROHINI where its data are available.
    Print ISSN: 1110-757X
    Digitale ISSN: 1687-0042
    Thema: Mathematik
    Publiziert von Hindawi
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