scholarly journals The impact of the construction of the new 400 kV transmission power lines between Slovakia and Hungary on the cross-border transmissions

2019 ◽  
Vol 70 (5) ◽  
pp. 418-428
Author(s):  
Marek Siranec ◽  
Alena Otcenasova ◽  
Peter Bracinik
Keyword(s):  
Simulation Model ◽  
Transmission Lines ◽  
Transmission System ◽  
Power Lines ◽  
Transmission Power ◽  
System Operation ◽  
Cross Border ◽  
Before And After ◽  
The Cross ◽  
The Impact

Abstract This article is focused on the analysis of impacts on the cross-border transmissions between Slovakia and Hungary and between Slovakia and Ukraine after the completion of the new 400 kV transmission lines on the cross-border profile Slovakia – Hungary. A simulation model of the Slovak transmission system in software ETAP was created, which is set for exploring the impacts of the new Slovak – Hungarian transmission lines 447, 480 and 481 on the cross-border and national transmissions. Correctness of the created simulation model was confirmed by the match of the measured values from winter nationwide measurement with the calculated values from the simulation model. Subsequently, several variants of the Slovak transmission system operation before and after completion of the new power lines to Hungary were evaluated.

Introduction

2009 ◽  
Vol 13 (3) ◽  
pp. 193-198 ◽  
Author(s):  
Christoph Dörrenbächer ◽  
Florian Becker-Ritterspach
Keyword(s):  
Developing Countries ◽  
Multinational Corporations ◽  
Special Issue ◽  
Firm Level ◽  
Economic Implications ◽  
Cross Border ◽  
The Cross ◽  
Political Dimensions ◽  
The Impact

Intrafirm competition, production relocation and outsourcing define crucial ways of organising and reorganising the cross-border operations of multinational corporations. What is more: these organisational activities put severe pressure on established economic coordination and governance both in developed as well as in developing countries. However, despite their organisational, political and economic salience, rather little is known about these processes and in particular about their socio-political dimensions. To this end, the contributions of this special issue aim at exploring, first, who the relevant actors are, what their interests are and how their strategies can be captured in intrafirm competition, production relocation and outsourcing. Second, the contributions discuss the wider socio-economic implications of firm-level processes by discussing, for example, the impact of outsourcing and relocation on employment fragmentation. Finally, the importance of public discourses is highlighted with regard to their role in both legitimating and promoting intrafirm competition, production relocation and outsourcing.

scholarly journals Mathematical and Simulation Model for Reliability Analysis of a Heterogeneous Redundant Data Transmission System

Mathematics ◽  
2021 ◽  
Vol 9 (22) ◽  
pp. 2884
Author(s):  
Hector Gibson Kinmanhon Houankpo ◽  
Dmitry Kozyrev
Keyword(s):  
Steady State ◽  
Simulation Model ◽  
Reliability Analysis ◽  
Data Transmission ◽  
Transmission System ◽  
System Operation ◽  
Free System ◽  
Redundant Data ◽  
Data Transmission System ◽  
Steady State Probabilities

In the actual study, we carried out a reliability analysis of a repairable redundant data transmission system with the use of the elaborated mathematical and simulation model of a closed heterogeneous cold standby system. The system consists of one repair unit and two different data sources with an exponential cumulative distribution function (CDF) of their uptime and a general independent CDF of their repair time. We consider five special cases of the general independent CDF; including Gamma, Weibull-Gnedenko, Exponential, Lognormal and Pareto. We study the system-level reliability, defined as the steady-state probability (SSP) of failure-free system operation. The proposed analytical methodology made it possible to assess the reliability of the whole system in the event of failure of its components. Specific analytic expressions and asymptotic valuations are obtained for the steady-state probabilities of the system and the SSP of failure-free system operation. A simulation model of the system in cases where it is not workable to obtain expressions for the steady-state probabilities of the system in an explicit analytical form was considered, in particular for constructing the empirical system reliability function. The issue of sensitivity analysis of reliability characteristics of the considered system to the types of repair time distributions was also studied. The simulation modeling was done with the R statistics package.

scholarly journals Adaptive seismic noise reduction using Wiener filter

2019 ◽  
Vol 8 (1) ◽  
pp. 12-20
Author(s):  
Sesar Prabu Dwi Sriyanto
Keyword(s):  
Seismic Noise ◽  
Cross Correlation ◽  
Seismic Station ◽  
Wiener Filter ◽  
Dominant Frequency ◽  
Observation System ◽  
Before And After ◽  
Filter Process ◽  
The Cross ◽  
The Impact

Seismic noise disrupts the earthquake observation system due to the frequency and amplitude of seismic noise similar to the earthquake signal. The filter process is one of the methods that can be used to reduce seismic noise. In this study, the Wiener filter algorithm was designed with the Decision-Directed method for Apriori SNR estimation. This filter was chosen because it is adaptive, so it can adjust to environmental conditions without requiring manual parameter settings. The data used are earthquake signals that occur in the Palu area, Central Sulawesi, which are recorded on PKA29 temporary seismic station from February 3 to April 28, 2015. After each signal data has been filtered, then it is evaluated by calculating SNR differences before and after filtering, the signal's dominant frequency, and the cross-correlation of the signal before and after filtering. As a result, the Wiener filter is able to reduce the noise content in earthquake signals according to noisy frequencies before earthquake signals. The impact is that SNR has increased with an average of 8.056 dB. In addition, this filter is also able to maintain the shape of earthquake signals. This is indicated by the normalization value of the cross-correlation between signals before and after the filter which ranges from 0.703 to 1.00.

scholarly journals Impact of the Kunming–Bangkok Highway on Land Use Changes along the Route between Laos and Thailand

Land ◽  
2021 ◽  
Vol 10 (9) ◽  
pp. 991
Author(s):  
Fangyu Zheng ◽  
Jiuming Huang ◽  
Zhiming Feng ◽  
Chiwei Xiao
Keyword(s):  
Land Use ◽  
Land Use Changes ◽  
Sustainable Use ◽  
Road Construction ◽  
Buffer Zone ◽  
Scientific Basis ◽  
The Road ◽  
Cross Border ◽  
Before And After ◽  
The Impact

Road construction fragments the landscape, reduces connectivity, and drives land use changes. To our knowledge, little is known about the scope and intensity of the effects of cross-border roads on changes in land use. Here, with the land use data products provided by the US Agency for International Development’s SERVIR Mekong project, using the GIS-based spatial analysis to quantitatively analyze and compare the effects of the cross-border road on land use changes within a 30 km buffer area along the Kunming–Bangkok Highway between Laos and Thailand. The results show the following: The greater the distance was from the highway, the smaller were the overall changes in land use within the buffer zone. A comparison of the situation before and after the road was opened in 2013 revealed significant differences in the most influential land use types of agricultural expansion, i.e., from 47.07% to 52.07% (the buffer zone was 1 km). In particular, 57.32% (1381.93 ha) and 40.08% (966.46 ha) of the land occupied by forests had been converted into land for plantation and agriculture, respectively, from 2013 to 2018. The scope of the impact of the operational route on the dynamics of land use was inconsistent. The largest impact before the road became operational was within 4 km of the buffer zone (0.26 to 0.24). Once the road had been opened, the range of its impact was beyond 10 km (0.63 to 0.57). The work here can provide a scientific basis for regional transportation planning and the sustainable use of land resources.

scholarly journals Modelling of Luminous Flux Directed to the Upper Hemisphere from Electrical Substation before and after the Refurbishment of Lighting Systems

Energies ◽  
2022 ◽  
Vol 15 (1) ◽  
pp. 345
Author(s):  
Tomas Novak ◽  
Petr Becak ◽  
Roman Dubnicka ◽  
Jana Raditschova ◽  
Dionyz Gasparovsky ◽  
...  
Keyword(s):  
Rural Areas ◽  
Luminous Flux ◽  
Transmission System ◽  
International Standards ◽  
Low Luminance ◽  
Before And After ◽  
System Operator ◽  
Lighting Systems ◽  
Electrical Substation ◽  
The Impact

This article deals with options for how to express the luminous flux from outdoor electrical substations of the electric transmission system. Processing of the models of light emissions before and after refurbishment of lighting systems was motivated by setting out rules for the design and erection of refurbished lighting systems in outdoor electrical substations, which are most commonly built in inhabited rural areas with low luminance of the background. The proposed model and calculations are based on requirements of international standards and recommendations for lighting of outdoor workplaces as well as on internal regulations of the ČEPS (Czech Transmission System Operator). These requirements are implemented in real electrical substations and lighting models that are extended by the calculation space of the software goniophotometer. The software goniophotometer was used to evaluate light distribution characteristics of entire electric stations in various situations. This article assesses the impact of different lighting systems installed at electrical substations from the perspective of both direct and total luminous flux directed to the upper hemisphere. It takes into account three outdoor electrical substations (420 kV) of a transmission network and their lighting systems before and after refurbishment. The aim of this article is to determine to what extent the electrical substations contribute to emissions of luminous flux to the upper hemisphere. Results from calculations on models show reduced radiation to the upper hemisphere up to 52.3% after refurbishment of obsolete lighting systems, although total installed flux actually increased due to a change in the ratio of direct and reflected luminous flux after refurbishment of lighting systems.

scholarly journals An Empirical Study on the Trade Impact of Cross border E-commerce on ASEAN and China under the Framework of RECP

2021 ◽  
Vol 275 ◽  
pp. 01039
Author(s):  
Guanhui Wang ◽  
Zengyu Cao
Keyword(s):  
Geographical Location ◽  
Economic Factor ◽  
The Internet ◽  
Global Trade ◽  
Trade Volume ◽  
Cross Border ◽  
The Cross ◽  
Asean Countries ◽  
Trade Gravity Model ◽  
The Impact

As an indispensable part of future global trade, the cross-border e-commerce will change the form and volume of the current global trade with globalization. Taking China and ten ASEAN countries as the research object, this paper empirically tests whether the cross-border e-commerce under the RCEP framework will affect the trade scale between China and ten ASEAN countries through the trade gravity model. As the research suggests, the impact of GDP and the Internet popularity on the trade scale of different ASEAN countries and China is not the same. Malaysia, Vietnam, Singapore, Thailand and other countries have larger trade volume with China due to economic factor, Internet, geographical location and other factors, while Brunei and Laos, which are closer to China with smaller economic volume, have more obvious shortcomings and are less related to the trade with China.

scholarly journals Review and Progress towards the Common Broadband Management of High-Voltage Transmission Grids: Model Expansion and Comparative Modal Analysis

2012 ◽  
Vol 2012 ◽  
pp. 1-18 ◽  
Author(s):  
Athanasios G. Lazaropoulos
Keyword(s):  
High Voltage ◽  
Power Grid ◽  
Signal Propagation ◽  
Power Lines ◽  
Analysis Tool ◽  
Transmission Power ◽  
Transmission Potential ◽  
The Common ◽  
End To End ◽  
The Impact

The need of bridging the digital gap between underdeveloped/developed areas and promoting smart grid (SG) networks urges the deployment of broadband over power lines (BPL) systems and their further integration. The contribution of this paper is fourfold. First, based on the well-established hybrid model of (Lazaropoulos and Cottis 2009, 2010, Lazaropoulos, 2012) and the generic multidimensional network analysis tool presented in (Lazaropoulos 2012, Sartenaer 2004, Sartenaer and Delogne 2006, 2001) an exact multidimensional chain scattering matrix method, which is suitable for overhead high-voltage/broadband over power lines (HV/BPL) networks, is proposed and is evaluated against other theoretical and experimental proven models. Second, the proposed method investigates the overhead HV/BPL transmission grids (overhead 150 kV single-circuit, 275 kV double-circuit, and 400 kV double-circuit multiconductor structures) with regard to their end-to-end signal attenuation. It is found that the above features depend drastically on the overhead power grid type, the frequency, the MTL configuration, the physical properties of the cables used, the end-to-end distance, and the number, the length, and the terminations of the branches encountered along the end-to-end BPL signal propagation. Third, the impact of the multiplicity of the branches at the same junction in overhead HV grids is first examined. Based on the inherent long-branch structure and the quasi-static behavior of single/multiple branches with matched terminations of overhead HV grid, a simple approach suitable for overhead HV/BPL channel estimation is presented. Fourth, identifying the similar characteristics among different overhead HV/BPL configurations, an additional step towards the common overhead HV/BPL analysis is demonstrated; the entire overhead HV/BPL grid may be examined under a common PHY framework regardless of the overhead HV/BPL grid type examined. Finally, apart from the presentation of broadband transmission potential of the entire overhead transmission power grid, a consequence of this paper is that it helps towards: (i) the better broadband monitoring and management of overhead HV transmission power grids in an interactive SG network; and (ii) the intraoperability/interoperability of overhead HV/BPL systems under the aegis of a unified transmission/distribution SG power network.

A framework for analysing cross-border climate change impacts, responses and their propagation

2021 ◽  
Author(s):  
Timothy R. Carter ◽  
Magnus Benzie ◽  
Emanuele Campiglio ◽  
Henrik Carlsen ◽  
Stefan Fronzek ◽  
...  
Keyword(s):  
Climate Change ◽  
Conceptual Framework ◽  
Global Economy ◽  
Climate Change Impacts ◽  
Transmission System ◽  
Arctic Sea Ice ◽  
Climate Impacts ◽  
The European Union ◽  
Cross Border ◽  
The Impact

<p>Most studies of climate change impacts, adaptation and vulnerability confine their attention to impacts and responses within the same geographical region. However, cross-border climate change impacts that occur remotely from the location of their initial impact can severely disrupt societies and livelihoods (Benzie et al., 2019; Carter et al., under review). In this paper we present a conceptual framework and accompanying terminology for describing and analysing such cross-border impacts. The conceptual framework distinguishes an initial impact that is caused by a climate trigger within a specific region. Downstream consequences of that impact propagate through an impact transmission system while adaptation responses to deal with the impact are propagated through a response transmission system.</p><p>The framework recognises and classifies differences in the types of climate trigger, categories of cross-border impacts, scales and dynamics of impact transmission, targets and dynamics of responses and the socio-economic and environmental context. We will demonstrate how the framework can be applied using  historical examples of cross-border impacts (e.g. the severe 2011 floods that affected industrial production in Thailand, propagating through the global economy) as well as prospective cases (e.g. multiple cross-border risks and opportunities presented by Arctic sea ice decline).</p><p>We argue that the framework provides a simple, but flexible, structure to describe and analyse cross-border climate impacts and their consequences. It offers a foundation for consistent comparisons of different patterns of cross-border impacts in different sectors and geographies. It also aids understanding of adaptation strategies and their potential consequences. In particular, with systematic application of the framework it is possible to highlight gaps in our existing understanding of system dynamics, or gain new insights into particular leverage points within the system. These can be targeted in order to find ways of building resilience to climate change in the region of origin, along the impact transmission system and in the recipient region exposed to the propagated risk.</p><p>Acknowledgement</p><p>This work is being undertaken as part of the European Commission Horizon 2020-funded project CASCADES (Cascading climate risks: Towards adaptive and resilient European Societies).</p><p>References</p><p>Benzie M, Carter TR, Carlsen H, Taylor R (2019) Cross-border climate change impacts: implications for the European Union. <em>Regional Environmental Change</em> 19: 763-776, https://doi.org/10.1007/s10113-018-1436-1.</p><p>Carter TR, Benzie M, Campiglio E, Carlsen H, Fronzek S, Hildén M, Reyer CPO, West C (in review) A conceptual framework for cross-border impacts of climate change.</p>

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