Large Diameter Elevated Transmission Pipeline Crossing of the Snohomish River Estuary: A Case Study Addressing Unique Design Challenges

2011 ◽  
Author(s):  
Gregory S. Harris ◽  
Souheil Nasr ◽  
Jay D. Cooke
Keyword(s):  
Large Diameter ◽  
River Estuary ◽  
Transmission Pipeline ◽  
Pipeline Crossing ◽  
Design Challenges

Thinning in mature eastern white pine: 43-year case study

2002 ◽  
Vol 78 (4) ◽  
pp. 539-549 ◽  
Author(s):  
Paul D Anderson ◽  
John C Zasada ◽  
Glen W Erickson ◽  
Zigmond A Zasada
Keyword(s):  
Genetic Diversity ◽  
Dna Analysis ◽  
Large Diameter ◽  
White Pine ◽  
Thinning Intensity ◽  
Pine Regeneration ◽  
Volume Production ◽  
Pine Stands ◽  
Over Time

A white pine (Pinus strobus L.) stand at the western margin of the species range, approximately 125 years of age at present, was thinned in 1953 from 33.5 m2 ha-1 to target residual basal areas of 18.4, 23.0, 27.5, and 32.1 m2 ha-1 . Repeated measurement over the following 43-years indicated that the greatest total volume production and the greatest number of large diameter trees occurred in the unit of highest residual density. Over time, the distribution of stems was predominantly random although mortality between 1979 and 1996 resulted in a tendency for clumping in the 23.0 and 27.5 m2 ha-1 treatments. DNA analysis indicated that thinning intensity had little effect on the genetic diversity of residual white pine. This study suggests that mature white pine stands in northern Minnesota may be managed at relatively high densities without loss of productivity. However, regardless of overstory density, there was little or no white pine regeneration occurring in this stand. Key words: thinning, growth, genetic diversity, molecular markers, spatial pattern, regeneration

Case study: conservation and restoration of a pair of large diameter English globes

2015 ◽  
Vol 38 (1) ◽  
pp. 77-91
Author(s):  
T.K. McClintock ◽  
Lorraine Bigrigg ◽  
Deborah LaCamera
Keyword(s):  
Large Diameter

Pressure Test Planning to Prevent Internal Corrosion by Residual Fluids

2012 ◽  
Author(s):  
Trevor Place ◽  
Greg Sasaki ◽  
Colin Cathrea ◽  
Michael Holm
Keyword(s):  
Structural Integrity ◽  
Large Diameter ◽  
Long Distance ◽  
Internal Corrosion ◽  
Pressure Testing ◽  
Practical Strategy ◽  
Leak Testing ◽  
Pressure Test ◽  
Transmission Pipeline ◽  
Pipeline Project

Strength and leak testing (AKA ‘hydrotesting’, and ‘pressure testing’) of pipeline projects remains a primary method of providing quality assurance on new pipeline construction, and for validating structural integrity of the as-built pipeline [1][2][3]. A myriad of regulations surround these activities to ensure soundness of the pipeline, security of the environment during and after the pressure testing operation, as well as personnel safety during these activities. CAN/CSA Z662-11 now includes important clauses to ensure that the pipeline designer/builder/operator consider the potential corrosive impacts of the pressure test media [4]. This paper briefly discusses some of the standard approaches used in the pipeline industry to address internal corrosion caused by pressure test mediums — which often vary according to the scope of the pipeline project (small versus large diameter, short versus very long pipelines) — as well as the rationale behind these different approaches. Case studies are presented to highlight the importance of considering pressure test medium corrosiveness. A practical strategy addressing the needs of long-distance transmission pipeline operators, involving a post-hydrotest inhibitor rinse, is presented.

Assessment of heavy metal pollution in surficial sediments from a tropical river-estuary-shelf system: A case study of Kelantan River, Malaysia

2017 ◽  
Vol 125 (1-2) ◽  
pp. 492-500 ◽  
Author(s):  
Ai-jun Wang ◽  
Chui Wei Bong ◽  
Yong-hang Xu ◽  
Meor Hakif Amir Hassan ◽  
Xiang Ye ◽  
...  
Keyword(s):  
Heavy Metal ◽  
Metal Pollution ◽  
Heavy Metal Pollution ◽  
River Estuary ◽  
Surficial Sediments ◽  
Tropical River ◽  
System A

scholarly journals Mobile Gaming for Agonistic Design

2016 ◽  
Author(s):  
Alexander Holland ◽  
Stanislav Roudavski
Keyword(s):  
Participatory Design ◽  
Positive Change ◽  
Mobile Games ◽  
Mobile Gaming ◽  
Urban Cycling ◽  
Stakeholder Workshop ◽  
Design Challenges

This paper demonstrates how mobile games can contribute to participatory design and its aim of achieving positive change through the involvement of stakeholders. This overarching goal is considered via a particular case-study that utilizes a purpose-built smartphone game. The case-study applies this game to the design challenges of urban cycling. Utilisation of the game in a stakeholder workshop suggests that mobile play can aid understanding and help to establish communication amongst diverse participants. For further information and media, see https://osf.io/vy5dq/

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