Polygonal Forms Research Articles

Green Synthesis of Metallic Nanoparticles from Quercus Bark Extracts: Characterization and Functional Properties.

Quercus species are utilized for their durable wood, providing sustenance for wildlife, conserving biodiversity, and contributing ecological, medicinal, and esthetic benefits to ecosystems and landscapes. In this study, we aimed to use the bark of three Quercus species (Q. dalechampi, Q. fraineto, and Q. petraea) for the synthesis of silver and gold nanoparticles (AgNPs and AuNPs). The aqueous extracts from the bark of Quercus sp. acted both as reducing and stabilizing agent, facilitating the rapid synthesis of AuNPs (AuQD, AuQF, and AuQP) and AgNPs (AgQD, AgQF, and AgQP). The obtained nanoparticles were characterized using UV-vis spectroscopy, TEM, DLS, and FTIR. Characterizations revealed that the nanoparticles exhibited a variety of shapes, such as polygonal, triangular, and spherical forms, with sizes ranging between 14 and 24 nm for AuNPs and 45-70 nm for AgNPs. The total phenolic content was assessed through spectroscopic methods, while several individual phenolic compounds were identified and quantified using UPLC-PDA. Furthermore, we assessed the antioxidant, antibacterial, and antifungal capacities of AuNPs, AgNPs, and raw extracts. The highest antioxidant activity was observed for raw extracts, followed by AgNPs and AuNPs, while the most potent antibacterial and antifungal activity was observed in AgQP. Moreover, cytotoxicity was examined in a human keratinocyte cell line (HaCaT). The results indicated no cytotoxic effects for AuNPs, while AgNPs and the raw extracts exhibited cytotoxic effects after 48 h of incubation. This research underscores the multifaceted utility of Quercus bark extracts in the green synthesis of metallic nanoparticles and their subsequent bioactivity assessment, suggesting promising perspectives for their application in various fields while urging cautious consideration of their cytotoxic implications.

Focusing field energy flow simulation of an azimuthally polarized Lorentz–Gaussian beam modulated by a concentric vortex phase mask

Based on the vector diffraction theory, this paper investigated the energy flow evolution of focusing an azimuthally polarized Lorentz–Gaussian beam modulated by concentric vortex phase mask. Three concentric zones make up the concentric vortex phase mask: the center zone, middle circular zone, and outer circular zone. Each zone has an adjusted phase. The findings demonstrate that flexible transverse energy flow rings can be obtained in the focal plane and that transverse energy flows with various polygonal forms can be produced by varying the middle circular radius or phase distribution. By adjusting the phase of the center zone and outer circular zone, the normalized transverse energy flow distribution can be rotated or changed. Findings demonstrate that this technique offers a potent means of controlling the distribution and orientation of Poynting vectors and electromagnetic fields. Moreover, a series of energy flow rings are generated to facilitate the transportation of absorptive particles to predetermined positions. These phenomena may provide a new approach for particle capture and optical particle manipulation.

Landmarks of the Metropolis, the Types of Forms of Varsovian Skyscrapers as Compared to Global Precedence

The following paper is devoted to research on the types of forms of skyscrapers built in Warsaw from 1989 to 2022. The research focuses on defining the architectural typology of such forms as elements of the image of the city. The research was carried out in the following stages: defining the character of international examples of skyscrapers, research on types of forms of high-rise buildings realized in Warsaw and their formal classification, determination of typological features of twenty-four high-rise buildings under study, and their changes over time. The characteristic elements of the image of the city and urban composition related to the examined buildings were determined. As a result of the research, it was determined that the most common types of forms found in the study group were free forms—41.6%, polygonal forms—25%, and obelisk forms—20.8%. In individual cases, there are tapered, aerodynamic, and regional forms. The research showed a trend in the latest projects, dating back to the last five years, consisting of an increase in the number of buildings constructed, an increase their scale, a lowering of their slenderness, and a tendency to implement polygonal forms more often than free forms. High-rise buildings are landmarks in the urban composition and the image of Warsaw. Most often, they designate paths and nodes with which they are associated. The types of forms of high-rise buildings in Warsaw vary; there is no uniform type of form of high-rise building implemented in the period. For this reason, the research should be updated and carried out using the methodology presented in the paper.

Effect of (NbTi)C Particles on the Microstructure and Hardness of High Chromium and Nickel Indefinite Chilled Cast Iron

High chromium and nickel indefinite chilled cast iron (ICCI), as an excellent hot roll material, is the preferred roll variety due to its good combination of surface roughness, hot crack resistance, and hot wear resistance. The microstructure and hardness of ICCI roll materials with different contents of (NbTi)C particles is studied here, and the microstructure evolution process is analyzed by X-ray diffraction. The influence of (NbTi)C particles on the carbide morphology and distribution is investigated by metallographic microscopy and scanning electron microscopy, and the existence of (NbTi)C particles is observed. The experimental results show that (NbTi)C particles are present in granular, rod, and polygonal forms. Combined with a Thermo-Calc solidification phase diagram, it is found that the (NbTi)C particles undergo eutectic precipitation in the melt, forming short rod-shaped (NbTi)C carbides with a size of about 10 μm. Through the Rockwell hardness test, it is found that the hardness after adding 0.8 wt % (NbTi)C particles was 54.4 HRC, which was 21.1% higher than that without the addition.

The Ediacaran record of glaciogenic dropstones, diamictites and cap carbonates associated with non-metamorphosed banded iron formations (BIFs) in Iran

The Ediacaran period is marked by global icehouse episode, greenhouse period, increasing levels of oxygen-carbon dioxide, syn-glaciogenic structures-BIFs, typical Ediacaran biota and a marked negative carbon isotope excursion. On this global point, field glaciogenic structures, petrographic textures, Ediacaran biota, U-Pb zircon ages, C-O isotopes and geochemical data record an Ediacaran glaciogenic BIFs event in Iran. The Ediacaran (578–547 or 578–541.8 Ma) glaciogenic sequences in Bafq and Hormuz Island mining districts include submarine syn-glaciovolcanic rhyolitic rocks, rhyolitic tuffs, shaly tuffaceous carbonates, dropstone-bearing jaspilitic BIFs, salt minerals, ferruginous diamictites, and cap carbonates. The presence of polygonal, bullet-shape and flatiron forms of gneiss, greenschist, quartz schist, quartzite, marble and magnetite-hematite clasts in a matrix of jaspilitic magnetite-hematite, muddy sandstones and muddy dolomitic rocks records an Ediacaran glaciogenic event. The dropstones occur as lone-stones, dump-stones and deflect their underlying layers. The diamictites contain similar clasts to those of the dropstones, are gradationally covered by buff to dark-grey cap carbonates ± dropstones and resemble the Ghaub, Chuos and Kingston Peak Formation diamictites. C-O isotopes, REE+Y diagrams, high Y/Ho ratios, positive Eu-Y anomalies and subtle Ce anomaly possibly reflect a possible hydrothermal origin for the cap carbonates. Delta 13C values (−0.42 to −6.33‰) in cap carbonates show similar negative signatures to the Ediacaran Shuram glaciogenic event. Average delta 18O (−8.34‰) in the least-altered cap carbonates gives a precipitation temperature of 252.7 °C in the waning stage of the glaciogenic BIFs-hydrothermal system.

Features of the development of specialized and special map classifiers

The article presents the need for target specialization of a new generation of topographic maps of the Arctic territories, taking into account their physical and geographical specificity. The possibility of such specialization on the basis of theoretical, information and technological substantiation using remote sensing materials from space and GIS cartography has been determined. Studies have been carried out to determine the decoding capabilities of space images, in order to expand and clarify the existing system of conventional signs of cryogenic relief and soils. On the basis of research, new conventional signs for polygonal, bumpy, ice, solifluction and thermokarst forms are proposed.

НОВЫЕ ПОДХОДЫ К ОТОБРАЖЕНИЮ МЕРЗЛОТНЫХ ФОРМ РЕЛЬЕФА НА ЦИФРОВЫХ ТОПОГРАФИЧЕСКИХ КАРТАХ СИБИРСКОЙ ЗОНЫ АРКТИКИ

The analysis of traditional topographic maps and plans of the Siberian Arctic zone shows that their relevance and completeness of content do not fully meet the modern requirements for the further de-velopment of this region. There is a need for targeted specialization of a new generation of topograph-ic maps and plans of Arctic territories, taking into account their physical and geographical specifics. The purpose of the work was to determine the possibility of such specialization based on the use of remote sensing materials from space and computer technologies.To achieve this goal, studies have been conducted to determine the visual and automated decryption capabilities of Landsat Sentinel sat-ellite images in order to expand and refine the existing system of conventional signs of cryogenic re-lief. Based on these studies, new conventional signs for polygonal, bumpy, solifluctional and thermo-karst forms are proposed. The conclusion is made about the need for specialization of other specific elements of Arctic maps – vegetation, hydrography, soils.

Application of computer simulation and high-precision visual matching technology in green city garden landscape design

Graphic images of computer three-dimensional simulation technology are widely used in the construction industry. Technical applications mainly include 3D simulation software and some 3D modeling tools. In the application field, there are simulation simulations of industrial architecture and interior design, urban landscape design, and demonstration simulations during construction. Based on the computer simulation technology, this thesis made a 3D simulation model with a sense of reality. Based on the calculation amount of the computer system model surface and the calculation amount of basic map texture resources, the production of the model was completed. 3D simulated points, lines, surfaces and various levels of polygonal forms. As a result, the accuracy of the spatial element layout optimization model becomes lower and the convergence speed becomes slower. A reasonable layout simulation method for landscape space elements is proposed. Selected patch area, landscape percentage, patch number, maximum patch index and average patch area as the browsing index. Use Ahp to calculate the weight of the above landscape index, and use the matching test to change and adjust the judgment result. The results show that the proposed 3D simulation model has excellent visual effects, can clearly reflect all design elements of landscape design, and its high precision and high convergence rate can be effectively applied to urban landscape design. • Graphic images of computer three-dimensional simulation technology are widely used in the construction industry. • Based on the computer simulation technology, this thesis made a 3D simulation model with a sense of reality. • The accuracy of the spatial element layout optimization model becomes lower. • The proposed 3D simulation model has excellent visual effects.

Modeling and analysis of fractal growth patterns from the material point

The growth of fractals from a material point is modeled using single-phase and multi-phase algorithms for linear fractals and polygonal fractal forms. The connection of fractal growth processes with the phenomena of formation in nature is considered. A method for analyzing growth processes and their characteristics is proposed. The growth laws of fractals metric characteristics and their transformation when changing the growth algorithm are revealed. The growth path of fractal points and the distribution of the slope angles of their elements are analyzed. The influence of stochastic fluctuations in the length of fractal elements on the process of its growth is modeled. It is shown that the algorithms and methods used for analyzing growth processes have a great potential for modernization and adaptation to a wide range of tasks.

Numerical simulations of gradient cooling technique for controlled production of differential microstructure in steel strip or plate

<abstract><p>Numerical studies were conducted to investigate the applicability of cooling strategies for controlledly producing a microstructure in the steel strip or plate, which changes as function of the plate length. In the numerical simulations, the water spray cooling was varied as function of the plate length and as a result, the different parts of the plate were cooled at different rates. We applied the previously developed numerical code where the transformation latent heat is coupled with the heat conduction and transfer model, which has also been calibrated to correspond to experimental laboratory cooling line. The applicability of the method was investigated for controlledly creating alternating bainite and polygonal ferrite regions in plates of two different thicknesses (0.8 cm and 1.2 cm thick plates) by cooling different parts of the plate to different temperatures before switching off the water cooling so that polygonal ferrite forms in the part which has been cooled to higher temperature and bainite forms in the low temperature part. The simulation results indicate that the controlled production of such alternating regions is possible, but the resulting regions in the studied scenario cannot be very thin. The transition regions between the ferrite and bainite regions in the simulated cases are in the range of 5–15 cm. Controlled production of zones consiting of softer phase in the otherwise bainitic steel could offer a possibility for creating designed tracks in a steel bainitic strip or plate, where the mechanical working or cutting of the material is easier.</p></abstract>

Regular ternary polygonal forms

Inspired by Dickson's classification of regular ternary quadratic forms, we prove that there are no primitive regular $m$-gonal forms when $m$ is sufficiently large. In order to do so, we construct sequences of primes that are inert in a certain quadratic field and show that they satisfy a certain inequality bounding the next prime by the product of the previous primes, a question of independent interest.

Possible reversibility between epithelioid and sarcomatoid types of mesothelioma is independent of ERC/mesothelin expression

BackgroundMesothelioma is histologically divided into three subgroups: epithelioid, sarcomatoid, and biphasic types. The epithelioid or sarcomatoid type is morphologically defined by polygonal or spindle-like forms of cells, respectively. The biphasic type consists of both components. It is not yet understood how histological differentiation of mesothelioma is regulated. ERC/mesothelin is expressed in most cases of the epithelioid type, but not in the sarcomatoid type of mesothelioma. Consequently, its expression is well correlated to the histological subtype. We hypothesized that ERC/mesothelin expression influences the histological differentiation of mesothelioma, and tested this hypothesis.MethodsWe performed studies using the overexpression or knockdown of ERC/mesothelin in mesothelioma cells to examine its effect on cellular morphology, growth kinetics, or migration/invasion activity, in vitro. We then transplanted ERC/mesothelin-overexpressing and control cells into the intraperitoneal space of mice. We examined the effect of ERC/mesothelin overexpression on mouse survival and tumor phenotype.ResultsIn vitro cell culture manipulations of ERC/mesothelin expression did not affect cellular morphology or proliferation, although its overexpression enhanced cellular adhesion and the migration/invasion activity of mesothelioma cells. The survival rate of mice following intraperitoneal transplantation of ERC/mesothelin-overexpressing mesothelioma cells was significantly lower than that of mice with control cells. The histological evaluation of the tumors, however, did not show any morphological difference between two groups, and our hypothesis was not validated. Unexpectedly, both groups (ERC/mesothelin-overexpressing and control) of mesothelioma cells that were morphologically monophasic and spindle-like in vitro differentiated into a biphasic type consisting of polygonal and spindle-like components in the transplanted tumor, irrespective of ERC/mesothelin expression.ConclusionsThese results suggested that the histological transition of mesothelioma between epithelioid and sarcomatoid types may be reversible and regulated not by ERC/mesothelin, but by other unknown mechanisms.

PALYNOLOGICAL STUDY OF GENUS Pterocephalus IN IRAQ

This research was aimed to study the pollen morphology for the genus Pterocephalus(Vaill) from Dipsacaceae family in Iraq, and to utilize these feathers in isolating the species as valuable taxonomic traits for enriching Iraqi flora. The study included characteristics of the type, shape, size, sculpturing and apertures, as well as determining the full dimensions using light microscopy as well as numerical analysis of this species and draw polygonal shapes and denderogram convergence between species. The results of the study of pollen and polygonal forms showed significant differences in the characteristics at the level of each species, which helps to identification the genus species, as it was found that the pollen was a tricolpate, and shape was specified to be sub spheroidal, sub prolate, oblate spheroidal. and prolate spheroidal, The pollen grains varied in size between large, and very large size. However the most significant feature is that included four types of sculpture using to isolate the species to : Reticulate and spinate in P. laxus ,P. strictus, and P. nestorianu, reticulate and spinulate in P. brevis, P. plumosus, Reticulate to striate and spinulate in P. canus, and Spinate in P. kurdicus, and P. pyrethrifolius. The dendritic scheme showed the convergence of some species among them and in varying convergence ratios.

A polygonal open-loop resonator compact bandpass filter for Bluetooth and WLAN applications

In this paper, a new bandpass filter is designed using two open-loop resonators with polygonal forms. The use of polygonal forms leads to compact size and broad bandwidth behavior. The overall filter dimensions are 8×16 mm2, which correspond to 0.4λg × 0.2λg using a substrate with Rogers Ro 3010 with a relative permittivity of 10.2 and a thickness of 1.5 mm. The resulting filter exhibits enhanced passband behavior with two transmission zeros. The resulting passband has a centre frequency of 2.40 GHz, and a bandwidth of 230 MHz and fractional bandwidth (FBW) of 10%, with return loss of about −26 dB and insertion loss equal to −0.8 dB. The locations of the two transmission zeros are at 2.176 GHz and 2.638 GHz, which means that there is a sharp cut before and beyond the passband. The simulation and performance evaluation of the proposed filter were carried out using Microwave Studio Suite (MWS) Computer Simulation Technology (CST). The resulting performance of the proposed filter makes it very desirable for Bluetooth and WLAN applications (IEEE 802.11n).

Fabrication of Oligomeric Avidin Scaffolds for Valency-Controlled Surface Display of Functional Ligands.

Multivalent surface display of biomolecules is crucial to study and utilize multivalent biological interactions. However, precise valency control of surface-displayed ligands remains extremely difficult. Now a series of new oligomeric avidin proteins were fabricated that allow facile control of surface multivalency of biotinylated ligands. Naturally dimeric rhizavidin (RA) was engineered to form a mixture of oligomeric avidin assemblies, and discrete RA oligomers from the dimer to octamer of RA, were homogeneously prepared. These oligomeric avidins are in polygonal forms with expected numbers of stable biotin binding sites. Upon immobilization on low-density biotin-coated gold surfaces, RA dimer, trimer, and tetramer scaffolds provided accurate mean residual valencies of 2, 3, and 4, respectively, for biotinylated proteins. Valency-controlled display of antibody binding protein G on these RA surfaces showed clear valency-dependent enhancement of antibody capturing stability.

Clastic polygonal networks around Lyot crater, Mars: Possible formation mechanisms from morphometric analysis

Polygonal networks of patterned ground are a common feature in cold-climate environments. They can form through the thermal contraction of ice-cemented sediment (i.e. formed from fractures), or the freezing and thawing of ground ice (i.e. formed by patterns of clasts, or ground deformation). The characteristics of these landforms provide information about environmental conditions. Analogous polygonal forms have been observed on Mars leading to inferences about environmental conditions. We have identified clastic polygonal features located around Lyot crater, Mars (50°N, 30°E). These polygons are unusually large (>100 m diameter) compared to terrestrial clastic polygons, and contain very large clasts, some of which are up to 15 metres in diameter. The polygons are distributed in a wide arc around the eastern side of Lyot crater, at a consistent distance from the crater rim. Using high-resolution imaging data, we digitised these features to extract morphological information. These data are compared to existing terrestrial and Martian polygon data to look for similarities and differences and to inform hypotheses concerning possible formation mechanisms. Our results show the clastic polygons do not have any morphometric features that indicate they are similar to terrestrial sorted, clastic polygons formed by freeze-thaw processes. They are too large, do not show the expected variation in form with slope, and have clasts that do not scale in size with polygon diameter. However, the clastic networks are similar in network morphology to thermal contraction cracks, and there is a potential direct Martian analogue in a sub-type of thermal contraction polygons located in Utopia Planitia. Based upon our observations, we reject the hypothesis that polygons located around Lyot formed as freeze-thaw polygons and instead an alternative mechanism is put forward: they result from the infilling of earlier thermal contraction cracks by wind-blown material, which then became compressed and/or cemented resulting in a resistant fill. Erosion then leads to preservation of these polygons in positive relief, while later weathering results in the fracturing of the fill material to form angular clasts. These results suggest that there was an extensive area of ice-rich terrain, the extent of which is linked to ejecta from Lyot crater.

Synthesis of γ-Fe2O3, Fe3O4 and Copper Doped Fe3O4 Nanoparticles by Sonochemical Method

Nanoparticles of undoped and copper doped with Fe3O4 of three concentrations (0.5, 1.0 and 1.5) are synthesized by sonochemical method. Structural, optical and morphological properties of these compounds were studied. Fe2+/Fe3+ ratio is found to be 2.36. Crystalline structure, lattice parameters, surface morphologies, direct and indirect band gap energies of the synthesized compounds were estimated and the results are discussed in detail. The XDR analysis indicates the Cu doped Fe3O4 nanoparticles have higher crystallinity than undoped samples. Average crystallite size is found to increase as Cu concentration increased. The FTIR results are proven by the presence of mixed magnetite-hematite nanostructures and it is complement to the XRD results. The presence of spherical, polygonal and agglomeration forms of the particles are visually seen in the SEM images. Direct and indirect band gap energy is found to be decreased as the copper concentration was increased.

Effect of sand grain size on simulated mining-induced overburden failure in physical model tests

To investigate the influence of sand grain size (SGS) on mining-induced overburden failure in physical model tests, uniaxial compressive experiments on rock-like material with various SGSs were performed, and two SGSs (0–0.5 and 0.5–1mm) were selected. The Young's modulus, uniaxial compressive strength, and tangent modulus were larger in rock-like material samples with finer SGS and the failure mode changed from mostly shear failure to tensile failure with rising SGS. As the mechanical characteristics of coarser sand samples are weaker, the overburden breakage distance was shorter in the coarser-sand model and the ratio of the average breakage distance between the two models was 1.688. The extent of the overburden fracture was heavier in the coarser-sand model and closer pattern to that of the actual coal mine. A large database of the heights of the overburden caved zone (Hcz) and fractured zone (Hfz) values with various mining height (Hm) based on previous studies was compiled to obtain best-fit parabolic empirical formulas. The Hcz/Hm and Hfz/Hm ratios measured in the field were similar to those estimated by the proposed empirical formulas. The discrepancy between the physical model test and field measurement may be explained by the fracture pattern in the overburden of the caved zone in the form of layered rectangles, unlike the polygonal forms in the coal mine. We propose four recommendations to optimize the physical model for such tests, from the perspective of SGS. The results and recommendations presented here can provide a useful guide for coal mining scientists and engineers designing models for testing of coal mining conditions.

Establishment and characterization of a coculture system of equine endometrial epithelial and stromal cells.

To investigate the equine endometrium as close to the in vivo situation as possible, we established a coculture system for epithelial and stromal cells (ECs/SCs). ECs and SCs were isolated from nine endometrial tissue specimens. ECs obtained as glandular formations were cultivated on one side of the semipermeable membrane of a Millicell® insert. After 2days, SCs (2×104 cells/membrane) were seeded onto the other side of the same membrane. During cocultivation, the low serum containing culture medium (Theuß etal., 2010) was supplemented with different concentrations and combinations of 17β-estradiol (2.0-3.0pg/ml medium) and progesterone (0.5-15.0ng/ml medium). Once the cocultures formed continuous cell layers as determined by phase-contrast microscopy, the membranes were fixed and processed for light microscopical examination. Cytokeratin 19, steroid hormone receptors and the uterine proteins uteroglobin and calbindinD9k were detected using immunocytochemistry to determine the degree of culture purity and functional cellular differentiation. The culture purity of the EC layer averaged ≥95%. Uteroglobin and calbindinD9k were consistently expressed in ECs, while hormone receptors were predominantly absent in both cell populations. An explicit cytomorphological epithelial differentiation with formation of round-oval to polygonal cell forms was encountered in ≤50% of all ECs and independent of supplemented steroids. Based on the findings altogether, and despite the partly absent congruence to the in situ prerequisites, we established a standardized and reproducible coculture system, which offers a basic approach for studies of physiologic and pathophysiologic issues in the mare.

ОПЫТ ЛАНДШАФТНОГО АНАЛИЗА ПРОСТРАНСТВЕННЫХ ЗАКОНОМЕРНОСТЕЙ ПРОДУКТИВНОСТИ ЗОНАЛЬНЫХ ЭКОСИСТЕМ ЮЖНОЙ МЕЩЕРЫ

The extent, causes and factors of local variations in biological productivity of zonal forest ecosystems are examined on a case study of the model area of subtaiga of the East European Plain (Ryazan oblast, the Meshchera lowland). It is established that in conditions of wide distribution of Pleistocene sands and lowcontrast relief of the Meshchera lowland the main limiting factor of the biological productivity is waterlogging. In according with the classical concept of Russian regional landscape science (school of N.A. Solntsev), the leading role of relief (including the relict relief) and morphology of the bedrock surface in the biological productivity and dynamics of moisture is proved. It is noted that the dynamics of moisture in the landscape depends not only on the relief but also on the characteristics of the buried bedrock. Based on the analysis of geological history the genetic typification of morphostructures with the specific features of forest productivity is performed. It is identified that the most significant decline in biological productivity of tree species (up to 50–60% of zonal average) is observed in the contours of ancient erosive valleys. The regional maximum of forest productivity (up to 1.5 times higher than the average forest productivity in subtaiga of the East European Plain) is observed on the top of the buried pre-Jurassic erosive massif (outliers), composed of limestone. Due to the high density of limestone (1.20–1.33 times higher than that of other bedrock, composing the territory), its local protrusions form a positive gravitational anomaly that stimulates dynamics of moisture and reduces the impact of waterlogging. The genetic link of landscape processes in the Pleistocene and Holocene and indicator role of the periglacial forms of morphosculpture are identified. The most productive forests correspond to relicts of polygonal forms and the flowing thermokarst, minimum productivity correspond to areal shape and shore bars. It is established that the efficiency of drainage melioration depends on the landscape structure and most visible near the top of the buried pre-Jurassic erosive massif, composed of limestone (growth of productivity of hydromorphic ecosystems up to 20%). The effect of drainage melioration in the contours of the ancient erosive valleys is insignificant.