Application of basin approach for soil and water protection geoplanning of territory and environmental management

The article analyzes existing in the world and Russian practice organizational and management arrangements of rational environmental management principles based on basin principles. As the basis of the assessment and management of land resources, as an example of a river basin (the river Vorsklitsa) in Belgorod region (Russia), we have taken the concept of territory geoplanning with basin organization of natural resources usag

Basin and eco-regional approach to optimize the use of water and land resources

The paper presents the principles of justification of the boundaries and composition of ecoregions as hydrologically separate, integral natural and economic structures, within which a quantitative and qualitative assessment of the results of the geoplanning of integrated components of the territories of nature, population and economy on the basin principle can be most effectively carried outyesБелгородский государственный университе

Higher-order nonlinear modes and bifurcation phenomena due to degenerate parametric four-wave mixing

We demonstrate that weak parametric interaction of a fundamental beam with its third harmonic field in Kerr media gives rise to a rich variety of families of non-fundamental (multi-humped) solitary waves. Making a comprehensive comparison between bifurcation phenomena for these families in bulk media and planar waveguides, we discover two novel types of soliton bifurcations and other interesting findings. The later includes (i) multi-humped solitary waves without even or odd symmetry and (ii) multi-humped solitary waves with large separation between their humps which, however, may not be viewed as bound states of several distinct one-humped solitons.Comment: 9 pages, 17 figures, submitted to Phys. Rev.

Функції бюджетної системи та забезпечення стратегічних цілей посттрансформаційного економічного розвитку України

У статті досліджено проблеми визначення та реалізації стратегічних цілей економічного розвитку України в умовах завершення перехідного періоду, роль та місце держави, зокрема її бюджетної політики, у забезпеченні конкурентоспроможності національної економічної та соціальної системи в умовах глобалізації та інформатизації світового господарства

Бюджетна політика в Україні як відбиття протиріч у системі цілеполагання

У статті аналізуються деякі причини, чинники та форми прояву суперечностей у системі цілеполагання при визначенні стратегічних завдань економічної та, зокрема, бюджетної і соціальної політики, розв’язання яких сприяло би становленню нової якості конкурентоспроможності національного господарства, соціально-економічних відносин, добробуту громадян

Model of position-dynamic structure of river basins

In this work, we have presented semi automated means of modeling of position-dynamic structure (PDS) of river basins’ landscapes with application of geo-informational systems (GIS). Results of modeling were tested on the basin of one of headwaters. The structure of the model includes landscape lines, layers, sub-regions and regions. The model takes into account conditions of formation of landscape’s PDS in mountain and plain parts of river basinsyesБелгородский государственный университе

Quadratic solitons as nonlocal solitons

We show that quadratic solitons are equivalent to solitons of a nonlocal Kerr medium. This provides new physical insight into the properties of quadratic solitons, often believed to be equivalent to solitons of an effective saturable Kerr medium. The nonlocal analogy also allows for novel analytical solutions and the prediction of novel bound states of quadratic solitons.Comment: 4 pages, 3 figure

Polychromatic solitons in a quadratic medium

We introduce the simplest model to describe parametric interactions in a quadratically nonlinear optical medium with the fundamental harmonic containing two components with (slightly) different carrier frequencies [which is a direct analog of wavelength-division multiplexed (WDM) models, well known in media with cubic nonlinearity]. The model takes a closed form with three different second-harmonic components, and it is formulated in the spatial domain. We demonstrate that the model supports both polychromatic solitons (PCSs), with all the components present in them, and two types of mutually orthogonal simple solitons, both types being stable in a broad parametric region. An essential peculiarity of PCS is that its power is much smaller than that of a simple (usual) soliton (taken at the same values of control parameters), which may be an advantage for experimental generation of PCSs. Collisions between the orthogonal simple solitons are simulated in detail, leading to the conclusion that the collisions are strongly inelastic, converting the simple solitons into polychromatic ones, and generating one or two additional PCSs. A collision velocity at which the inelastic effects are strongest is identified, and it is demonstrated that the collision may be used as a basis to design a simple all-optical XOR logic gate.Comment: 9 pages, 8 figures, accepted to Phys. Rev.

Optical Cherenkov radiation by cascaded nonlinear interaction: an efficient source of few-cycle energetic near- to mid-IR pulses

When ultrafast noncritical cascaded second-harmonic generation of energetic femtosecond pulses occur in a bulk lithium niobate crystal optical Cherenkov waves are formed in the near- to mid-IR. Numerical simulations show that the few-cycle solitons radiate Cherenkov (dispersive) waves in the \lambda=2.2-4.5\mic range when pumping at \lambda_1=1.2-1.8\mic. The exact phase-matching point depends on the soliton wavelength, and we show that a simple longpass filter can separate the Cherenkov waves from the solitons. The Cherenkov waves are born few-cycle with an excellent Gaussian pulse shape, and the conversion efficiency is up to 25%. Thus, optical Cherenkov waves formed with cascaded nonlinearities could become an efficient source of energetic near- to mid-IR few-cycle pulses.Comment: Extended version of Nonlinear Optics 2011 contribution http://www.opticsinfobase.org/abstract.cfm?URI=NLO-2011-NTuA7. Submitted for Optics Express special issue for NLO conferenc