Study on Stray Current Protection for Lanzhou Rail Transit Line 1

2014 ◽  
Vol 641-642 ◽  
pp. 727-730
Author(s):  
Ya Ning Li
Keyword(s):  
Yellow River ◽  
Rail Transit ◽  
Safe Operation ◽  
Stray Current ◽  
Operation System ◽  
Building Conditions ◽  
Factors Affecting ◽  
Protection Scheme ◽  
System Improvement ◽  
Maintenance Process

Stray current is one of the crucial factors affecting safety running for train. It is the first Rail Transit Line for Lanzhou. According to the local geological data, line direction, crossing Yellow River, building conditions, some measurements were put forward to restrict the stray current leakage in Lanzhou Rail Transit Line 1. Especially, it is very important to prevent the water permeating into the soil connecting to the railway. Corresponding protection scheme was laid down in this paper. The protection scheme in this study has very important role in the safe operation, system improvement and maintenance process for Lanzhou Rail Transit Line 1.

Ticket Income Distribution of Urban Rail Transit in Network Operating Condition

2011 ◽  
Vol 243-249 ◽  
pp. 4375-4380
Author(s):  
Yuan Chun Huang ◽  
Jian Li ◽  
Haize Pan
Keyword(s):  
Income Distribution ◽  
Urban Rail Transit ◽  
Ratio Method ◽  
Rail Transit ◽  
Matching Algorithm ◽  
Factors Affecting ◽  
Urban Rail ◽  
Set Up ◽  
Urban Rail Transit Network ◽  
Factor Matching

Through analyzing the factors affecting passengers’ path-choice, the corresponding principles and rules of the ticket income distribution are put forward and the new model of the Urban Rail Transit Network in Beijing is set up in the paper. Through the deformation of the urban rail transit and the simplification of the lines, the topology of the urban rail transit lines is abstracted into an undirected connection graph. Breadth-priority optimization algorithm is applied to search the effective paths between the OD and the flow-matching ratio is acquired by calculating based on multi-factor matching algorithm, in which many relevant numerical examples are analyzed to verify the feasibility of the dual-ratio method and to summarize the characteristics of the project.

Application of analysis methods and forecasting of time series of indicators of the effectiveness of airworthiness maintaining of civil aircraft

2021 ◽  
pp. 30-36
Author(s):  
Keyword(s):  
Time Series ◽  
Random Processes ◽  
Civil Aviation ◽  
Random Component ◽  
Regular Component ◽  
Factors Affecting ◽  
Analysis Methodology ◽  
Civil Aircraft ◽  
Harmonic Components ◽  
Maintenance Process

The use of the analysis methodology and forecasting of time series of indicators of the effectiveness of maintaining airworthiness of aircraft of civil aviation made it possible to present the dynamics of indicators as a combination of the regular component, harmonic components with oscillation periods of 12 months and more, and a random component, which represents random processes developing under the influence of groups of factors affecting the airworthiness maintenance process. The results obtained are aimed at improving the safety and effectiveness of aircraft use. Keywords: aircraft, airworthiness, effectiveness of airworthiness maintenance, analysis methodology, forecasting, time series of effectiveness indicators. [email protected]

scholarly journals Study on level-of-service for urban rail transit passages from the passenger perspective

2021 ◽  
Vol 283 ◽  
pp. 02041
Author(s):  
Yibing Chen ◽  
Xiao Liang ◽  
Yizhuo Fu
Keyword(s):  
Public Transportation ◽  
Orthogonal Experiment ◽  
Reliability And Validity ◽  
Service Level ◽  
Urban Rail Transit ◽  
Classification Method ◽  
Rail Transit ◽  
Factors Affecting ◽  
Passenger Satisfaction ◽  
Urban Rail

With the acceleration of urbanization and the shortage of transportation resources in large cities, urban rail transit has gradually become the backbone of urban public transportation system. In order to improve the service level of urban rail transit, this paper studies the factors influencing the service level of subway station passages and the classification method based on the passenger-perception method. Through investigation and research, the passage service level evaluation indicators (width, walking time, per capita area, illumination intensity and guide signage) have been determined. Based on orthogonal experiment, 3ds max was used to set up 25 passage scenes with different parameters from passengers' perspective. A passenger satisfaction questionnaire was designed and distributed, the reliability and validity of the questionnaire were tested to ensure the validity of the data. And based on the factor analysis method, the factors affecting passenger perception are analyzed. A well-fitting model of the relationship between passenger scores and passage parameters is established, and the passenger scores are converted into service levels. Finally, a service level classification method is given, which can provide reference for the service level evaluation of existing stations and the design of physical attributes and environmental factors of new station passages.

Integrity Challenges Associated with Stray Current Corrosion Across Monolithic IJ's and Resolutions

2021 ◽  
Author(s):  
Ebrahim Salem Al Salemi ◽  
Saleh Salem Al Ameri ◽  
Ajiv Mohan Nair ◽  
Humaid Musabah Al Ali ◽  
Mario Jr Javier Zantua ◽  
...  
Keyword(s):  
Cathodic Protection ◽  
Ionic Current ◽  
Low Carbon Steel ◽  
Internal Surface ◽  
Low Carbon ◽  
Stray Current ◽  
Gas Industry ◽  
Factors Affecting ◽  
Steel Material ◽  
Internal Lining

Abstract Corrosion and subsequent failures is one of the main factors affecting uninterrupted operations of Oil & Gas Industries. Pipelines are considered as most convenient means of crude and gas transportation in Oil & Gas Industry. Buried pipelines generally made of low carbon steel material are protected externally by coating and applying impressed current cathodic protection (ICCP). Monitoring and maintaining adequate level of Cathodic Protection (CP) for such pipelines remains challenging for corrosion engineers due to increased level of field congestion, complexity in accurate current mapping and mitigation of corrosion phenomena. Failure of pipelines due to corrosion can be catastrophic with following consequences: Loss of containment fluid and thereby probable fatalityDamage to asset/company reputationSafety and Environment (Fire, Toxic gases and Oil Spill)Resource and downtime cost impact Isolation joints IJ's are designed with very high insulating material at mating areas and installed on pipelines by welding to avoid loss of Cathodic Protection (CP) current. Due to high electrical insulation, a potential difference is formed across of IJ's due to applied CP current and stray currents. In upstream Oil & Gas Industry, multiphase crude transported via pipeline will have certain percentage of water and will induce an internal conductive path across the IJs resulting in ionic current discharge at anodic areas within internal surface. This study focuses on factors contributing to such internal stray current corrosion, limitation in monitoring methodology and mitigation programs. The study concludes with recommendations such as design modifications, improvement in internal lining properties and improved installation guidelines. The study practically illustrates effectiveness of combined resistive bonding and zinc earthing cells installation for controlling stray current propagation in order to reduce the corrosion rate so as to maintain Integrity of pipelines.

scholarly journals Adaptive Reuse of Apartments as Heritage Assets in the Seoul Station Urban Regeneration Area

2019 ◽  
Vol 11 (11) ◽  
pp. 3124 ◽  
Author(s):  
Jungwon Yoon ◽  
Jihye Lee
Keyword(s):  
Korean War ◽  
Adaptive Reuse ◽  
Urban Regeneration ◽  
Small Scale ◽  
Sustainable Building ◽  
Building Conditions ◽  
Factors Affecting ◽  
Physical Conditions ◽  
The Korean War ◽  
Apartment Complexes

Apartments were crucial solutions to provide sufficient dwellings and to improve residential environment quality in the period after the Korean War. Thirty years after the first rush of apartment construction, many of those apartments have been demolished. However, several small-scale apartment complexes or single-building apartments without collective estates were not included in reconstruction efforts due to property, ownership, and reconstruction feasibility issues. Four such apartments remain in the Seoul Station Urban Regeneration Area. Although they are considered severely deteriorated, their architectural, historical, and cultural heritage values warrant inclusion in the Seoul Future Heritage list. From the perspective of urban regeneration, these apartments should be targeted for revitalization not only to preserve their originality but to improve the quality of sustainable building conditions and operations. In this study, we examine Choongjeong Apartment, Hoehyeon Civic Apartment, St.Joseph Apartment, and Seosomun Apartment in terms of balance among six heritage values and their improvement needs, as well as possible revitalization strategies that support sustainable urban regeneration in the area. We argue that their physical conditions can be brought up to applicable building codes, if financial support is forthcoming and numerous decision-makers allow. However, sustainable revitalization of apartments requires examination of factors affecting adaptive reuse. Through a literature and data collection review within an analysis framework, we analyze factors and issues for adaptive reuse of the four apartments. It is expected that the findings of this paper will provide insight into the role of various actors determining and taking actions for strategic physical interventions and change of uses.

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