Evaluating the spatio-temporal development of coastal aquaculture: An example from the coastal plains of West Bengal, India

2021 ◽  
Vol 214 ◽  
pp. 105922
Author(s):  
Bhanu Kumar Mandal ◽  
Aznarul Islam ◽  
Biplab Sarkar ◽  
Abdur Rahman
Radiocarbon ◽  
2020 ◽  
pp. 1-11
Author(s):  
R Garba ◽  
P Demján ◽  
I Svetlik ◽  
D Dreslerová

ABSTRACT Triliths are megalithic monuments scattered across the coastal plains of southern and southeastern Arabia. They consist of aligned standing stones with a parallel row of large hearths and form a space, the meaning of which is undoubtedly significant but nonetheless still unknown. This paper presents a new radiocarbon (14C) dataset acquired during the two field seasons 2018–2019 of the TSMO (Trilith Stone Monuments of Oman) project which investigated the spatial and temporal patterns of the triliths. The excavation and sampling of trilith hearths across Oman yielded a dataset of 30 new 14C dates, extending the use of trilith monuments to as early as the Iron Age III period (600–300 BC). The earlier dates are linked to two-phase trilith sites in south-central Oman. The three 14C pairs collected from the two-phase trilith sites indicated gaps between the trilith construction phases from 35 to 475 years (2 σ). The preliminary spatio-temporal analysis shows the geographical expansion of populations using trilith monuments during the 5th to 1st century BC and a later pull back in the 1st and 2nd century AD. The new 14C dataset for trilith sites will help towards a better understanding of Iron Age communities in southeastern Arabia.


2006 ◽  
Author(s):  
C. J. Weiland ◽  
P. P. Vlachos

Supercavitation inception and formation was studied over blunt projectiles. The projectiles were fired using a gas gun method. In this method, projectiles are launched under the action of expanding detonation gases. Both qualitative and quantitative optical flow diagnostics using high speed digital imaging were used to analyze the spatio-temporal development of the supercavitating flow. For the first time, quantification of the supercavitation was achieved using Time Resolved Digital Particle Image Velocimetry (TRDPIV) detailing the two phase flow field surrounding the translating projectiles and the gas vapor bubble. Experimental results indicate that the supercavity forms at the aft end of the projectile and travels forward along the direction of projectile travel. The impulsive start of the projectile generates two asymmetric vortices which are shed from the blunt nose of the projectile. The vortices interact with the moving cavity and subsequently deform. This interaction is believed to directly contribute to the instabilities in the flight path.


2012 ◽  
Vol 4 (12) ◽  
pp. 3972-3994 ◽  
Author(s):  
Jana Edlinger ◽  
Christopher Conrad ◽  
John Lamers ◽  
Gulchekhra Khasankhanova ◽  
Thomas Koellner

2009 ◽  
Vol 96 (2) ◽  
pp. S25-S26
Author(s):  
Pankaj Gupta ◽  
Katherine Murphy ◽  
Matthew Nelson ◽  
Melissa Rusch ◽  
Zhenhong Nan ◽  
...  

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