scholarly journals Place and Role of Some Mass Bird Species in Biological Damage in the Fergana Valley of Uzbekistan

2021 ◽  
Vol 7 (9) ◽  
pp. 32-41
Author(s):  
A. Mamashukurov
Keyword(s):  
Power Supply ◽  
Bird Species ◽  
Power Lines ◽  
Fish Farms ◽  
Biological Damage ◽  
White Storks ◽  
Short Circuits ◽  
High Voltage Power Lines ◽  
Average Damage

The article provides data on the place and role of some common bird species in the Fergana Valley in biological damage. The reasons for the occurrence of biological damage in birds are discussed, the nature and degree of biological damage caused by white storks, green bee-eaters, myna, Indian and field sparrows on fish farms, power grid enterprises, viticulture and grain crops (wheat and rice) are discussed. Building their huge nests on the poles of high-voltage power lines during the year, white storks make short circuits, which lead to an interruption in the power supply. In the post-nesting period, large flocks of white storks arrive at fish farms. One bird eats an average of 600–800 g of fish per day. During spring and autumn migrations, green bee-eaters gathering at beekeeping farms, one pair per day destroys about 350–400 worker bees. Mynas, after the chicks leave the nests, together with fledglings, flies into the vineyards and, on average, damage 18.5% of the grape harvest. Field and Indian sparrows consume an average of 16.95% of the crop during the milky-wax ripeness of wheat. In rice fields during autumn migrations, the harm from sparrows is 2.1–13.4%. The article also provides data on some of the repellents used in preventing and reducing bio-damage caused by birds, discusses their effectiveness.

scholarly journals Choice of commutation device and development of the scheme of a universal sectionalizing point with automatic load transfer function for the 0.38 kV electric network

2019 ◽  
Vol 124 ◽  
pp. 02011 ◽  
Author(s):  
A. V. Vinogradov ◽  
A. V. Vinogradova ◽  
M. O. Ward ◽  
A. N. Kharkhardin ◽  
A. I. Psaryov ◽  
...  
Keyword(s):  
Transfer Function ◽  
Power Supply ◽  
Load Transfer ◽  
Power Source ◽  
Power Lines ◽  
Electrical Networks ◽  
Transformer Substation ◽  
Load Transfer Function ◽  
Short Circuits ◽  
Switching Devices

The overestimated length of rural power lines of 0.38 kV leads to the fact that it is often not possible to fulfill both the sensitivity conditions of the protective device installed at the transformer substation and protecting the line from overloads and short circuits, and the requirements of the power supply reliability of consumers. This problem can be solved by installing in-line universal sectionalizing point equipped with an automatic load transfer function. The use of these devices allows dividing a line into sections provides the necessary sensitivity of protection for each section of the line and the possibility of supplying power to undamaged areas from a backup power source. In addition, only with the use of automated switching devices installed in power lines, it is possible to create intelligent electrical networks. When developing these devices, it is necessary to take into account the electromechanical characteristics of switching devices that are planned to be used for switching lines.

SISTEM AUTOMATIC SWITCH REDUNDANT UPS UNTUK BEBAN ESSENSIAL

2019 ◽  
Vol 5 (1) ◽  
pp. 35-45
Author(s):  
Markus Dwiyanto Tobi ◽  
Alimuddin Mappa
Keyword(s):  
Power Supply ◽  
Working Condition ◽  
Control Circuit ◽  
Energy Sources ◽  
Main Equipment ◽  
Telecommunication Equipment ◽  
Input Condition ◽  
Research Designs ◽  
Switch Circuit

The role of the power supply device is to produce, process and distribute energy sources. Telecommunication equipment can only operate if it has continuous supply. Therefore, to maintain the continuity of the supply, a UPS (Uninterruptable Power Supply) device system is needed so that the supply to the Essential Load device will remain available so that continuity will be maintained. This research designs and proposes how a series of automatic redundant switch systems on UPS to ensure the availability of power supply for the main equipment of telecommunications systems. The Auto switch circuit is designed to have 3 (three) working stages which will trigger the relay driver as control circuit, namely the normal working condition of the contactor input K1 is present, the input condition is zero (lost), and the input condition is present. This system can automatically supply power to telecommunications equipment.

ACTIVE SCREENING MAGNETIC FIELD SYSTEMS SYNTHESIS FOR SINGLE-CIRCUIT HIGH VOLTAGE POWER LINES WITH VERTICAL CONDUCTORS WITH SINGLE COMPENSATING COIL

2017 ◽  
Vol 25 (101) ◽  
pp. 402-408
Author(s):  
Boris B., Kobyljanskij ◽  
◽  
Valery V., Kolomiec ◽  
Boris I., Kuznetsov ◽  
Tatyana B., Nikitina ◽  
...  
Keyword(s):  
Magnetic Field ◽  
High Voltage ◽  
Power Lines ◽  
Active Screening ◽  
Field Systems ◽  
High Voltage Power Lines

scholarly journals Evaluating the role of contracting and expanding rainforest in initiating cycles of speciation across the Isthmus of Panama

2012 ◽  
Vol 279 (1742) ◽  
pp. 3520-3526 ◽  
Author(s):  
Brian Tilston Smith ◽  
Amei Amei ◽  
John Klicka
Keyword(s):  
Bird Species ◽  
Tropical Regions ◽  
Isthmus Of Panama ◽  
Species Pairs ◽  
The Matrix ◽  
High Species Richness ◽  
The Rich ◽  
The Tropics ◽  
The Impact

Climatic and geological changes across time are presumed to have shaped the rich biodiversity of tropical regions. However, the impact climatic drying and subsequent tropical rainforest contraction had on speciation has been controversial because of inconsistent palaeoecological and genetic data. Despite the strong interest in examining the role of climatic change on speciation in the Neotropics there has been few comparative studies, particularly, those that include non-rainforest taxa. We used bird species that inhabit humid or dry habitats that dispersed across the Panamanian Isthmus to characterize temporal and spatial patterns of speciation across this barrier. Here, we show that these two assemblages of birds exhibit temporally different speciation time patterns that supports multiple cycles of speciation. Evidence for these cycles is further corroborated by the finding that both assemblages consist of ‘young’ and ‘old’ species, despite dry habitat species pairs being geographically more distant than pairs of humid habitat species. The matrix of humid and dry habitats in the tropics not only allows for the maintenance of high species richness, but additionally this study suggests that these environments may have promoted speciation. We conclude that differentially expanding and contracting distributions of dry and humid habitats was probably an important contributor to speciation in the tropics.

Anomalous features of the electron density in the topside ionosphere

1969 ◽  
Vol 311 (1507) ◽  
pp. 501-516 ◽  
Keyword(s):  
Electron Density ◽  
Power Supply ◽  
Data Rate ◽  
Power Lines ◽  
Topside Ionosphere ◽  
Telemetry Data ◽  
Electron Density And Temperature

The instruments which measure electron density and temperature are quite separate and independent in operation, but on account of the limitations in power supply and telemetry data rate the two experiments share the same power lines and some data channels.

Spatial Load Forecasting Based on Load Forecasting Reliability

2014 ◽  
Vol 672-674 ◽  
pp. 1075-1080 ◽  
Author(s):  
Bai Xiao ◽  
Hao Wang ◽  
Gang Mu
Keyword(s):  
Power Supply ◽  
Load Forecasting ◽  
Forecasting Error ◽  
Comprehensive Index ◽  
Gray Correlation Degree ◽  
Analysis Theory ◽  
Correlation Degree ◽  
Forecasting Method ◽  
Gray Correlation

A spatial load forecasting method based on reliability of load forecasting is proposed. It calculates the correlation of wave comprehensive index, variance, maximum predictable ability of each power supply small area’s historical load data by using the analysis theory of grey degree based on the analysis of load forecasting error last target year. The weight of each factor effected on prediction outcomes according to the gray correlation degree is determined, then the load forecasting reliability model of each power supply area is constructed. Finally, by using the adjustment role of load forecasting reliability, the load of target year is forecasted. Actual example shows that the spatial load forecasting method based on reliability of load forecasting is correct and effective.

scholarly journals Power line routing and configuration as major drivers of collision risk in two bustard species

Oryx ◽  
2020 ◽  
pp. 1-10 ◽  
Author(s):  
Ana Teresa Marques ◽  
Ricardo C. Martins ◽  
João Paulo Silva ◽  
Jorge M. Palmeirim ◽  
Francisco Moreira
Keyword(s):  
Abiotic Factors ◽  
Bird Species ◽  
Power Line ◽  
Power Lines ◽  
Mitigation Measures ◽  
Suitable Habitat ◽  
Collision Risk ◽  
Great Bustard ◽  
Line Configuration ◽  
Tetrax Tetrax

Abstract Collision with power lines is a major cause of mortality for many bird species. Understanding the biotic and abiotic factors that increase collision risk is therefore important for implementing mitigation measures to minimize mortality, such as power line rerouting or wire marking. Here, we used collision events registered during 2003–2015 along 280 km of transmission power lines in southern Portugal to analyse spatio-temporal patterns and collision risk factors in two sympatric, threatened, and collision-prone species: the great bustard Otis tarda and the little bustard Tetrax tetrax. The occurrence of collisions was not uniform across space and time, and variations could be explained by the species' ecological requirements, distribution patterns and behaviour. Although both species fly considerable distances between areas of suitable habitat, collisions were far more likely in power line sections with > 20% (for the little bustard) or > 50% (for the great bustard) of open farmland habitat in the surroundings. Power line configuration was also important: taller pylons and those with a higher number of wire levels posed a higher risk for both species. Wire marking had a small but significant effect for the little bustard, reducing collisions risk. There was, however, no similar effect for the great bustard, possibly a result of limited data. Mitigation measures should be implemented to prevent bustard collisions, including adequate route planning, ideally avoiding areas with > 20% of open habitat. Line configuration and wire marking are particularly important where such localities cannot be avoided and power lines cross areas with a high proportion of bustard habitat, including outside protected areas.

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