scholarly journals PECULIARITIES OF ESTATE OF THE NATIONAL GEODESIC NETWORK IN THE CENTRAL REGION OF UKRAINE

2021 ◽  
Vol 4 (164) ◽  
pp. 128-135
Author(s):  
P. Mikhno ◽  
I. Shelkovska ◽  
V. Kozar ◽  
S. Lashko
Keyword(s):  
Soil Properties ◽  
Fixed Points ◽  
Central Region ◽  
Significant Part ◽  
Soil Freezing ◽  
Technical Parameters ◽  
Minus Sign ◽  
Actual Amount

A common feature of NGN in the central region of Ukraine is aging. The differences are determined by the peculiarities of fixing its points on the locallity place. The choice of a specific type of geodetic signal was determined by local physical and geographical features of the location of the point, such as: soil properties, depth of soil freezing, visibility conditions, etc. On the territory of Poltava and Kirovohrad regions there are 70 types of centers, benchmarks and brands, which are fixed points of the planimetric, altitude and gravimetric networks. At the same time, only 9 types significantly prevail of distribution: soil centers and benchmarks for areas with shallow (up to 1.5 m) seasonal soil freezing of types 1, 1op, 2, 2op, 146, 160 and 160 Late; wall benchmarks type 143 and wall beacons type 144. The peculiarity of the central region of Ukraine is the presence of points that are both points of the planimetric NGN 1, 2 and 3 classes, and altitude NGN I or II classes. Thus such points are fixed either by the ground centers, or ground benchmarks, or horizontal beacons. Because of the lack of geodetic information on a significant part of the points of the planned and altitude networks, the condition of the NGN of the central region of Ukraine cannot be considered satisfactory at present. For the requirements of monitoring, it is proposed to expand the content of maps of construction, survey and updating of geodetic points with data on the rights of ownership or use of land locations of points and their cadastral numbers. It is also necessary to update the data on those points in the central region of Ukraine, the inspection of which was realized before 2010. The indicator of admissibility of losses of points of NGN which should be defined separately for networks of 1, 2 and 3 classes is offered. If according to the results of the calculation the actual amount of points is less than the minimum allowable for the corresponding class, and the indicator of admissibility of losses of points has a minus sign, then the corresponding network does not meet the technical parameters. Loss of points in this case is not allowed, and lost points must be restored. The results of the calculation of this indicator for the central region of Ukraine indicate the need to restore 6 points of the planimetric network of the 2 class in the Kirovohrad region and the inadmissibility of further losses of points of this class.

Figure – Ground Effects on Shape Memory for Objects versus Holes

Perception ◽  
10.1068/p5838 ◽  
2008 ◽  
Vol 37 (10) ◽  
pp. 1569-1586 ◽  
Author(s):  
Stephen Palmer ◽  
Janet Davis ◽  
Rolf Nelson ◽  
Irvin Rock
Keyword(s):  
Shape Memory ◽  
Recognition Test ◽  
Central Region ◽  
Shape Recognition ◽  
Solid Object ◽  
Minus Sign ◽  
Solid Objects ◽  
Ground Effects ◽  
Better Than

The circumstances under which the shapes of figure-versus-ground regions are perceived and remembered were investigated in three experiments that replicate, extend, and clarify Rubin's [1921 Visuell wahrgenommene Figuren (Copenhagen: Gyldendals)] classic study on this topic. In experiment 1, observers reported which of two regions they perceived as figure within ambiguous, bipartite, 2-D displays. In a later shape-recognition test, the shapes of regions previously seen as figures were remembered well, but the shapes of regions previously seen as grounds were remembered no better than novel distractor regions. In experiment 2 we examined the same question about memory for the shape of figure-versus-ground regions in nested displays in which the central region could be perceived either as a closer figure surrounded by a farther ground (ie as a solid object) or as a farther ground surrounded by a closer figure (ie as an empty hole). Unlike experiment 1, the shapes of regions initially perceived as grounds (holes) were remembered as well as those of regions initially perceived as figures (solid objects), and much better than those of novel distractor regions. In experiment 3 we further demonstrated that this outcome did not depend on the figure – ground instructions employed in experiment 2, because the same result was obtained with unambiguous 3-D cardboard displays of objects versus holes with no figure – ground instructions at all. The present findings support an account of hole perception in which the shape of an intrinsic hole is encoded as a shaped, immaterial (or virtual) surface where the absence of matter is coded by a functional ‘missing’ symbol (analogous to a minus sign in mathematics) to represent its non-material status.

scholarly journals Evaluating the performance of coupled snow–soil models in SURFEXv8 to simulate the permafrost thermal regime at a high Arctic site

2017 ◽  
Vol 10 (9) ◽  
pp. 3461-3479 ◽  
Author(s):  
Mathieu Barrere ◽  
Florent Domine ◽  
Bertrand Decharme ◽  
Samuel Morin ◽  
Vincent Vionnet ◽  
...  
Keyword(s):  
Climate Change ◽  
Thermal Conductivity ◽  
Soil Properties ◽  
Thermal Regime ◽  
Land Surface ◽  
Climate Models ◽  
High Arctic ◽  
Global Climate Models ◽  
Soil Freezing ◽  
Water Retention Capacity

Abstract. Climate change projections still suffer from a limited representation of the permafrost–carbon feedback. Predicting the response of permafrost temperature to climate change requires accurate simulations of Arctic snow and soil properties. This study assesses the capacity of the coupled land surface and snow models ISBA-Crocus and ISBA-ES to simulate snow and soil properties at Bylot Island, a high Arctic site. Field measurements complemented with ERA-Interim reanalyses were used to drive the models and to evaluate simulation outputs. Snow height, density, temperature, thermal conductivity and thermal insulance are examined to determine the critical variables involved in the soil and snow thermal regime. Simulated soil properties are compared to measurements of thermal conductivity, temperature and water content. The simulated snow density profiles are unrealistic, which is most likely caused by the lack of representation in snow models of the upward water vapor fluxes generated by the strong temperature gradients within the snowpack. The resulting vertical profiles of thermal conductivity are inverted compared to observations, with high simulated values at the bottom of the snowpack. Still, ISBA-Crocus manages to successfully simulate the soil temperature in winter. Results are satisfactory in summer, but the temperature of the top soil could be better reproduced by adequately representing surface organic layers, i.e., mosses and litter, and in particular their water retention capacity. Transition periods (soil freezing and thawing) are the least well reproduced because the high basal snow thermal conductivity induces an excessively rapid heat transfer between the soil and the snow in simulations. Hence, global climate models should carefully consider Arctic snow thermal properties, and especially the thermal conductivity of the basal snow layer, to perform accurate predictions of the permafrost evolution under climate change.

scholarly journals Multicriteria GIS-Based Approach in Priority Areas Analysis for Sustainable Urban Drainage Practices: A Case Study of Pato Branco, Brazil

Eng ◽  
2020 ◽  
Vol 1 (2) ◽  
pp. 96-111
Author(s):  
Claudinei Rodrigues de Aguiar ◽  
Jéssica Klemm Nuernberg ◽  
Thays Cristiane Leonardi
Keyword(s):  
Central Region ◽  
Planning Process ◽  
Multicriteria Analysis ◽  
Green Roofs ◽  
Urban Drainage ◽  
Rain Gardens ◽  
Technical Parameters ◽  
Permeable Pavements ◽  
Gis Environment ◽  
Management Approaches

Geographic information systems (GIS) and multicriteria decision methods are robust techniques for supporting the urban planning process, including urban drainage. New low-impact management approaches (LID) for rainwater have been investigated and have become increasingly used. Considering the central region of Pato Branco city, which suffers recurrent problems related to flooding, this work presents a method to identify potential areas for the application of LIDs, such as rainwater collection tanks, permeable pavements, green roofs, and rain gardens. The identification of these areas is based on the analysis in a GIS environment considering criteria related to both the land slope, the characteristics of land use and technical parameters. Thus, we observe that rainwater collection tanks are indicated for all habitations, permeable pavements are recommended for 6.30% of the study area, while green roofs can be implemented in 3.97% of the area. Finally, 3.03% can receive rain gardens. In total, 13.30% of the central region of Pato Branco can receive LIDs. The results obtained reveal that the use of the GIS tool associated with multicriteria analysis is efficient in choosing locations for the implementation of LIDs as alternatives for the management of urban drainage.

Written and oral aspects of an early Wahhābī epistle

2015 ◽  
Vol 78 (1) ◽  
pp. 161-178
Author(s):  
Michael Cook
Keyword(s):  
Eighteenth Century ◽  
Fixed Points ◽  
The Other ◽  
Significant Part ◽  
Plausible Account ◽  
Strong Concern ◽  
Over Time

AbstractEpistles of Muḥammad ibn ʿAbd al-Wahhāb, the founder of the Wahhābī movement in eighteenth-century Najd, are preserved in profusion in Wahhābī sources. One of them is a short epistle, clearly intended for a lay audience, that sets out basic Wahhābī dogma in terms of four principles (qawāʿid). This epistle is preserved by Wahhābī sources in several different versions; none of them are dated, making it hard to establish how the text evolved over time. The present study is based on two dated external witnesses to the text of the epistle. One is taken from an unpublished Baṣran refutation of 1745, and is translated here. The other is found in a Yemeni chronicle under the events of the year 1212/1797f. Thanks to these two fixed points, it is possible to construct a plausible account of the evolution of the text over the intervening decades. From this it is clear that while written transmission played a significant part in the evolution of the text, some of the more dramatic changes are the result of oral intervention. Moreover the role of orality is confirmed by evidence suggesting the extensive use of the epistle in oral settings, an illustration of the strong concern of Ibn ʿAbd al-Wahhāb to spread his message among the laity.

scholarly journals Evaluating the performance of coupled snow-soil models in SURFEXv8 to simulate the permafrost thermal regime at a high Arctic site

2017 ◽  
Author(s):  
Mathieu Barrere ◽  
Florent Domine ◽  
Bertrand Decharme ◽  
Samuel Morin ◽  
Vincent Vionnet ◽  
...  
Keyword(s):  
Thermal Conductivity ◽  
Soil Properties ◽  
Thermal Regime ◽  
Climate Changes ◽  
High Arctic ◽  
Global Climate Models ◽  
Soil Freezing ◽  
The Arctic ◽  
Water Retention Capacity ◽  
Coupled Models

Abstract. Global warming projections still suffer from a limited representation of the permafrost-carbon feedback. Predicting the response of the permafrost temperature to climate changes requires accurate simulations of the Arctic snow and soil properties. This study assesses the capacity of the coupled models ISBA-Crocus and ISBA-ES to simulate snow and soil properties at Bylot Island, a high Arctic site. Field measurements complemented with ERA-interim reanalysis were used to drive the models and to evaluate simulation outputs. Snow height, density, temperature, thermal conductivity and thermal resistance are examined to determine the critical variables involved in the soil thermal regime. Simulated soil properties are compared with measurements of thermal conductivity, temperature and water content. The simulated snow density profiles are erroneous, because Crocus and ES do not represent the upward water vapour fluxes generated by the strong temperature gradients within the snowpack. The resulting vertical profiles of thermal conductivity are inverted compared to observations, with high simulated values at the bottom of the snowpack. Still, ISBA-Crocus manages to successfully simulate the soil temperature in winter. Results are satisfactory in summer, but the temperature of the top soil could be better reproduced by representing adequately surface organic layers, i.e. mosses and litter, and in particular their water retention capacity. Transition periods (soil freezing and thawing) are the least well reproduced because the high basal snow thermal conductivity induces too rapid heat transfers between the soil and the snow in simulations. Hence, global climate models should carefully consider Arctic snow thermal properties, and especially the thermal conductivity of the basal snow layer, to perform accurate predictions of the permafrost evolution under climate changes.

Interstellar gas in the central region of the Galaxy

1967 ◽  
Vol 31 ◽  
pp. 239-251 ◽  
Author(s):  
F. J. Kerr
Keyword(s):  
Central Region ◽  
Galactic Plane ◽  
Neutral Hydrogen ◽  
Continuum Emission ◽  
Galactic Centre ◽  
Interstellar Gas ◽  
Hydrogen Recombination ◽  
The Galaxy ◽  
Centre Region ◽  
The Relationship

A review is given of information on the galactic-centre region obtained from recent observations of the 21-cm line from neutral hydrogen, the 18-cm group of OH lines, a hydrogen recombination line at 6 cm wavelength, and the continuum emission from ionized hydrogen.Both inward and outward motions are important in this region, in addition to rotation. Several types of observation indicate the presence of material in features inclined to the galactic plane. The relationship between the H and OH concentrations is not yet clear, but a rough picture of the central region can be proposed.

Access to effective ABA treatment in Ohio: Central region

2004 ◽  
Author(s):  
Christine Averill ◽  
Jacquie Wynn
Keyword(s):  
Central Region

Review of methods of slag removal from melt surface in hot metal and steel ladles

2020 ◽  
Vol 76 (12) ◽  
pp. 1243-1252
Author(s):  
B. A. Sivak ◽  
A. V. Protasov ◽  
L. A. Smirnov
Keyword(s):  
Settling Tank ◽  
Necessary Condition ◽  
Hot Metal ◽  
Slag Removal ◽  
Production Scale ◽  
Technical Parameters ◽  
Ecological Requirements ◽  
The Usa ◽  
Work Done ◽  
Technological Methods

The removal of slag from melt surface of hot metal and steel ladles is a necessary condition to provide a deep desulphurization and dephosphorization of hot metal and steel in the process of their processing. A review of methods of slag skimming presented, mainly based on slag mechanical shoveling and its removal out of ladles by vacuum sucking. It was shown, that manipulators design for the slag skimming working instrument moving depends on the production scale, mass of the processed heats, amount and properties of the slag to be removed, production process intensity and ecological requirements. Peculiarities of designs and technical parameters of machines for slag skimming presented, designed by Irkutsk plant of heavy machinery, Scientific and Production Enterprise n.a. M.I. Platov, VNIIMETMASH, Kuznetsk and Novolipetsk steel plants. Technological methods of control of slag composition and physical properties considered, first of all of viscosity and fluidity, which have significant effect on selection of a method of slag skimming. Advantages and drawbacks of actions, aimed at more complete slag removal from metal surface by a scraper noted including bath blowing off by an inert gas, liquid slag tapping into am intermediate settling tank following its removal into a slag bowl. In case of satisfactory fluidity it is possible to slag removal by vacuum sucking, which at the same time promoted the melt degassing. Work done in this area abroad noted. Methods of vacuum slag removal developed in the USA and Japan described.

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