NOPR Collection:

Bearing capacity of closed and open ended pipe piles installed in loose sand with emphasis on soil plug

2016-07-25T07:41:39Z

Title: Bearing capacity of closed and open ended pipe piles installed in loose sand with emphasis on soil plug Authors: Fattah, Mohammed Y.; Al-Soudani, Wissam H.S. Abstract: Present study investigates the behaviour of plug on pile load capacity and effect of plug removal. Different parameters are considered such as pile diameter to length ratio, type of installation in loose sand, removal of plug in three stages (50%, 75% and 100%) with respect to length of plug. Kerbala sand from Iraq, which is used as a foundation soil is poorly graded clean sand. It was concluded that the percentage of reduction in pile load capacity for open–ended pile increases with increase of the length of removal of the soil plug. Open-ended pipe pile behaves as a closed-ended if the soil plug formed inside piles is in state of partial plug or full plug. The failure of a pile to plug during driving does not necessarily mean that it will not plug during static loading, since inertia effects, which are present during driving are absent during static loading. This can be observed from the load-settlement curves where the open-ended piles exhibit large resistance to penetration due to mobilization of internal friction during static loading. Page(s): 703-724

Seasonal variation in fatty acid profiles of threadfin breams, Nemipterus mesoprion (Bleeker, 1853) and Nemipterus japonicas (Bloch, 1791) with respect to their size

2016-07-25T07:37:46Z

Title: Seasonal variation in fatty acid profiles of threadfin breams, Nemipterus mesoprion (Bleeker, 1853) and Nemipterus japonicas (Bloch, 1791) with respect to their size Authors: Ramesh, R.; Chakraborty, S.K.; Venkateshwarlu, G. Abstract: In order to evaluate its nutritive value, seasonal variation in total lipid and fatty acid profiles of different sizes of threadfin breams (Nempiterus mesoprion and N. japonicus) were studied. Total lipid content was significantly (P<0.05) high in large sizes of N. mesoprion and N. japonicus captured during winter and lowest in small groups during post-monsoon season. A total of 37 fatty acids were identified by GC-MS encompassing saturated, mono unsaturated, n-6, n-3 poly unsaturated and odd and branched chain fatty acids. High levels of n-3 PUFA (13.37 – 36.27%) and favourable n-3/n-6 PUFA ratio of 2.25 to 3.3 revealed nutritional significance of threadfin breams in human diet. Difference between small, medium and large groups of N. mesoprion and N. japonicus of respective seasons based on fatty acid composition were clearly established by principal component analysis. Page(s): 696-702

Invertebrate shells as pollution bio-indicators, Gebel El-Zeit area, Gulf of Suez,Egypt.

2016-07-25T07:33:35Z

Title: Invertebrate shells as pollution bio-indicators, Gebel El-Zeit area, Gulf of Suez,Egypt. Authors: Youssef, Mohamed; El-Sorogy, Abdelbaset; El-Sabrouty, Mohamed; Al-Otaibi, Naif Abstract: Sixteen well preserved Pelecypod and gastropod shells were analyzed for their Mn, Ni, Co, Cu, Zn and Pb content. Eight shells are belonging to the Pleistocene of Gebel El-Zeit and eight recent shells were collected from El-Zeit Bay. Average metal accumulation levels in Pleistocene shell of the study area is in the following order Mn< Ni < Cu < Co < Zn

Impact of wind and thermal forcing on the seasonal variation of three- dimensional circulation in the Caspian Sea

2016-07-25T07:29:10Z

Title: Impact of wind and thermal forcing on the seasonal variation of three- dimensional circulation in the Caspian Sea Authors: Shiea, M.; Chegini, V.; Bidokhti, A. A. Abstract: A three dimensional hydrodynamic model (COHERENS) has been used to study monthly circulation and water mass properties of the Caspian Sea. Boundary conditions given to the model were river discharge, wind speed, air temperature, relative humidity, cloud cover and precipitation rate. Model simulation showed cyclonic circulation in December and January especially in the south and middle of the Caspian Sea. Moreover, wind velocity and temperature had an important role in the formation and variations of currents in the Caspian Sea. The thermocline that was established in the southern coast of the Caspian Sea according to field data and results of model simulation, showed relatively similar trends, such that the thermocline is created at the depth of 30 to 40 meters in the Anzali port region during autumn and then the thermocline vanishes in winter with the decrease in temperature. In spring the thermocline layer is recreated at a depth of about 10 to 20 meters. Page(s): 671-686