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A Molecular Dynamic Simulation Investigation of RDFs of Water

Wu Fangdi, Zheng Huidong, Liu Junshao, Zheng Ximing

Abstract （977）

PDF （4225KB）（699）

Radial distribution function (RDF) of water in different conditions was studied by MD simulation with SPC/E water model. The results of RDFs between water oxygens and oxygens ( gOO( r) ) ) indicate that the nearest distance of water molecule is 0.25 nm. The first and second peaks of ( gOO( r) ) are in 0.28 nm and 0.45 nm which are the positions of first and second "water hull" respectively. The results of RDFs between water oxygens and hydrogens( gOO( r) ) indicated that the main distances of hydrogen bonds of water molecules are 0.18 nm. RDFs between water hydrogens and hydrogens( gOO( r) ) depended on the changes of hydrogen bonds of water molecules and( gOO( r) ) .

2014, 34 (3): 8-13. DOI: 10.3696/j.issn.1672-6952.2014.03.003

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Route Survey and Free Span Assessment for the Extended Service Subsea Pipelines in Bohai Bay

LI Chenggang，ZHANG Jing'an，ZHENG Hui，XIAO Zhiguo，XU Yongzhen

Abstract （550）

PDF （2118KB）（274）

Subsea pipeline is the lifeline of the offshore oil & gas field. More and more pipelines have reached their designed life with the increase of the service time. Geophysical equipment acquired the date of the free span, exposure and buried condition for the subsea pipelines. The subsea pipeline assessment system assessment the critical length and fatigue life of free span. By knowing of the condition of those lines in service, the operation risk was decreased and the safety of the subsea pipelines was increased. The support of maintenance for the owner of the subsea pipelines was also offered.

2013, 33 (4): 50-55.