The Experts below are selected from a list of 228 Experts worldwide ranked by ideXlab platform

Tarja Pitkanen - One of the best experts on this subject based on the ideXlab platform.

  • diversity of ribosomal 16s dna and rna based bacterial community in an office building drinking water system
    Journal of Applied Microbiology, 2016
    Co-Authors: Jenni Inkinen, Balamuralikrishna Jayaprakash, J Santo W Domingo, Minna M Keinanentoivola, Tarja Pitkanen
    Abstract:

    Aims Next-generation sequencing of 16S ribosomal RNA genes (rDNA) and ribosomal RNA (rRNA) was used to characterize water and biofilm microbiome collected from a drinking water distribution system of an office building after its first year of operation. Methods and Results The total bacterial community (rDNA) and active bacterial members (rRNA) sequencing databases were generated by Illumina MiSeq PE250 platform. As estimated by Chao1 index, species richness in cold water system was lower (180–260) in biofilms (Sphingomonas spp., Methylobacterium spp., Limnohabitans spp., Rhizobiales order) than in waters (250–580), (also Methylotenera spp.) (P = 0·005, n = 20). Similarly species richness (Chao1) was slightly higher (210–580) in rDNA libraries compared to rRNA libraries (150–400; P = 0·054, n = 24). Active Mycobacterium spp. was found in cross-linked polyethylene (PEX), but not in corresponding copper Pipeline biofilm. Nonpathogenic Legionella spp. was found in rDNA libraries but not in rRNA libraries. Conclusions Microbial communities differed between water and biofilms, between cold and hot water systems, locations in the building and between water rRNA and rDNA libraries, as shown by clear clusters in principal component analysis (PcoA). By using the rRNA method, we found that not all bacterial community members were active (e.g. Legionella spp.), whereas other members showed increased activity in some locations; for example, Pseudomonas spp. in hot water circulations’ biofilm and order Rhizobiales and Limnohabitans spp. in stagnated locations’ water and biofilm. Significance and Impact of the Study rRNA-based methods may be better than rDNA-based methods for evaluating human health implications as rRNA methods can be used to describe the active bacterial fraction. This study indicates that copper as a Pipeline Material might have an adverse impact on the occurrence of Mycobacterium spp. The activity of Legionella spp. maybe questionable when detected solely by using DNA-based methods.

T. R. Akhmetov - One of the best experts on this subject based on the ideXlab platform.

  • Analysis of Additional Factors in Determining the Failure Rate of Heat Network Pipelines
    Thermal Engineering, 2019
    Co-Authors: I. G. Akhmetova, T. R. Akhmetov
    Abstract:

    — For estimating the reliability of existing and newly developed circuit diagrams of heat networks, a special procedure is applied. By applying this procedure, which uses such input data as the length and operation time of Pipeline segments, it is possible to determine the availability factors and probabilities of failure-free operation for a heat network. The aims of this study are to reveal and consider additional factors in determining the failure rate of heat network Pipelines and to develop a new procedure for calculating indicators characterizing the reliability of heat supply to consumers. The failure rate of heat network elements depends, apart from the time they have been in operation, on the Pipeline wall residual thickness, corrosion activity of soil, Pipeline Material, failure of a Pipeline batch, other (previous) bursts in the considered segment, conduit flooding (flooding traces), and intersections with other utility lines. Additional factors significantly influencing the heat supply reliability, which, however, have not been included in the currently used procedure, are revealed, and an algorithm for calculating the heat network reliability is developed. The influence of the additional factors on the reliability of heat network operation is evaluated proceeding from the field data presented by regional heat supply companies. The influence of additional factors is taken into account in elaborating the new procedure and algorithm for calculating the heat supply’s reliability indicators. The results from numerical and experimental investigations confirmed the possibility of using the obtained functional dependencies for elaborating a procedure of calculating heat network’s reliability taking external factors into account.

Zhengbin Li - One of the best experts on this subject based on the ideXlab platform.

  • Pipeline Material Strain Monitoring System in Permafrost Pipeline of Molle-DaQing Pipeline
    Proceedings of the 9Th International Pipeline Conference - 2012 Vol 4, 2013
    Co-Authors: Pengchao Chen, Shimei Yang, Zhengbin Li, Shibin Zhang, Yanguang Ren
    Abstract:

    Mohe-Daqing Pipeline is the first Pipeline to be buried, passing through\nthe permafrost regions of North China where the temperature in winter is\nabout minus thirty degrees Celsius. This Pipeline has been transporting\nlarge quantities of crude oil per day to northern markets of China since\nJanuary 1st, 2011. It's a significant cooperation for both Russia and\nChina.\nThis paper reviews the design, construction, and operational challenges\nof the first Pipeline buried in the permafrost regions of North China.\nThe Pipeline is in so complicated geography environment that many kinds\nof geotechnical disaster could happen easily, including frost heave,\nthaw settlement, slope instabilities, and collapse and so on. Monitoring\nPipeline Material strain in specific region is important and\nsignificant. Ground movement of the Pipeline induces sufficiently large\nstrains to the Pipeline, which would cause wrinkling on the compression\nside of the pipe, or alternatively tensile fracture on the tensile side\nof the pipe. Brag fiber sensors have been located and composed on the\nsurface of the pipe, which were used to monitor Material strain\nreal-time data at any time.\nFinite element pipe soil interaction and ground movement models in\nspecific sites have been developed according to the monitoring data.\nWhether the generated Pipeline strain is exceeded the strain capacity or\nnot could be estimated by comparing with the strain capacity of the\nPipeline, which can help us to make decision for Pipeline safety\nmanagement and prevent Pipeline damage from geotechnical disaster.

  • Pipeline Material Strain Monitoring System in Permafrost of MoHe-DaQing Pipeline
    Volume 4: Pipelining in Northern and Offshore Environments; Strain-Based Design; Risk and Reliability; Standards and Regulations, 2012
    Co-Authors: Pengchao Chen, Shimei Yang, Shibin Zhang, Zhengbin Li
    Abstract:

    Mohe-Daqing Pipeline is the first Pipeline to be buried, passing through the permafrost regions of North China where the temperature in winter is about minus thirty degrees Celsius. This Pipeline has been transporting large quantities of crude oil per day to northern markets of China since January 1st, 2011. It’s a significant cooperation for both Russia and China.This paper reviews the design, construction, and operational challenges of the first Pipeline buried in the permafrost regions of North China. The Pipeline is in so complicated geography environment that many kinds of geotechnical disaster could happen easily, including frost heave, thaw settlement, slope instabilities, and collapse and so on. Monitoring Pipeline Material strain in specific region is important and significant. Ground movement of the Pipeline induces sufficiently large strains to the Pipeline, which would cause wrinkling on the compression side of the pipe, or alternatively tensile fracture on the tensile side of the pipe. Brag fiber sensors have been located and composed on the surface of the pipe, which were used to monitor Material strain real-time data at any time.Finite element pipe soil interaction and ground movement models in specific sites have been developed according to the monitoring data. Whether the generated Pipeline strain is exceeded the strain capacity or not could be estimated by comparing with the strain capacity of the Pipeline, which can help us to make decision for Pipeline safety management and prevent Pipeline damage from geotechnical disaster.Copyright © 2012 by ASME

I. G. Akhmetova - One of the best experts on this subject based on the ideXlab platform.

  • Analysis of Additional Factors in Determining the Failure Rate of Heat Network Pipelines
    Thermal Engineering, 2019
    Co-Authors: I. G. Akhmetova, T. R. Akhmetov
    Abstract:

    — For estimating the reliability of existing and newly developed circuit diagrams of heat networks, a special procedure is applied. By applying this procedure, which uses such input data as the length and operation time of Pipeline segments, it is possible to determine the availability factors and probabilities of failure-free operation for a heat network. The aims of this study are to reveal and consider additional factors in determining the failure rate of heat network Pipelines and to develop a new procedure for calculating indicators characterizing the reliability of heat supply to consumers. The failure rate of heat network elements depends, apart from the time they have been in operation, on the Pipeline wall residual thickness, corrosion activity of soil, Pipeline Material, failure of a Pipeline batch, other (previous) bursts in the considered segment, conduit flooding (flooding traces), and intersections with other utility lines. Additional factors significantly influencing the heat supply reliability, which, however, have not been included in the currently used procedure, are revealed, and an algorithm for calculating the heat network reliability is developed. The influence of the additional factors on the reliability of heat network operation is evaluated proceeding from the field data presented by regional heat supply companies. The influence of additional factors is taken into account in elaborating the new procedure and algorithm for calculating the heat supply’s reliability indicators. The results from numerical and experimental investigations confirmed the possibility of using the obtained functional dependencies for elaborating a procedure of calculating heat network’s reliability taking external factors into account.

Pengchao Chen - One of the best experts on this subject based on the ideXlab platform.

  • Pipeline Material Strain Monitoring System in Permafrost Pipeline of Molle-DaQing Pipeline
    Proceedings of the 9Th International Pipeline Conference - 2012 Vol 4, 2013
    Co-Authors: Pengchao Chen, Shimei Yang, Zhengbin Li, Shibin Zhang, Yanguang Ren
    Abstract:

    Mohe-Daqing Pipeline is the first Pipeline to be buried, passing through\nthe permafrost regions of North China where the temperature in winter is\nabout minus thirty degrees Celsius. This Pipeline has been transporting\nlarge quantities of crude oil per day to northern markets of China since\nJanuary 1st, 2011. It's a significant cooperation for both Russia and\nChina.\nThis paper reviews the design, construction, and operational challenges\nof the first Pipeline buried in the permafrost regions of North China.\nThe Pipeline is in so complicated geography environment that many kinds\nof geotechnical disaster could happen easily, including frost heave,\nthaw settlement, slope instabilities, and collapse and so on. Monitoring\nPipeline Material strain in specific region is important and\nsignificant. Ground movement of the Pipeline induces sufficiently large\nstrains to the Pipeline, which would cause wrinkling on the compression\nside of the pipe, or alternatively tensile fracture on the tensile side\nof the pipe. Brag fiber sensors have been located and composed on the\nsurface of the pipe, which were used to monitor Material strain\nreal-time data at any time.\nFinite element pipe soil interaction and ground movement models in\nspecific sites have been developed according to the monitoring data.\nWhether the generated Pipeline strain is exceeded the strain capacity or\nnot could be estimated by comparing with the strain capacity of the\nPipeline, which can help us to make decision for Pipeline safety\nmanagement and prevent Pipeline damage from geotechnical disaster.

  • Pipeline Material Strain Monitoring System in Permafrost of MoHe-DaQing Pipeline
    Volume 4: Pipelining in Northern and Offshore Environments; Strain-Based Design; Risk and Reliability; Standards and Regulations, 2012
    Co-Authors: Pengchao Chen, Shimei Yang, Shibin Zhang, Zhengbin Li
    Abstract:

    Mohe-Daqing Pipeline is the first Pipeline to be buried, passing through the permafrost regions of North China where the temperature in winter is about minus thirty degrees Celsius. This Pipeline has been transporting large quantities of crude oil per day to northern markets of China since January 1st, 2011. It’s a significant cooperation for both Russia and China.This paper reviews the design, construction, and operational challenges of the first Pipeline buried in the permafrost regions of North China. The Pipeline is in so complicated geography environment that many kinds of geotechnical disaster could happen easily, including frost heave, thaw settlement, slope instabilities, and collapse and so on. Monitoring Pipeline Material strain in specific region is important and significant. Ground movement of the Pipeline induces sufficiently large strains to the Pipeline, which would cause wrinkling on the compression side of the pipe, or alternatively tensile fracture on the tensile side of the pipe. Brag fiber sensors have been located and composed on the surface of the pipe, which were used to monitor Material strain real-time data at any time.Finite element pipe soil interaction and ground movement models in specific sites have been developed according to the monitoring data. Whether the generated Pipeline strain is exceeded the strain capacity or not could be estimated by comparing with the strain capacity of the Pipeline, which can help us to make decision for Pipeline safety management and prevent Pipeline damage from geotechnical disaster.Copyright © 2012 by ASME