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Occurrence of marine wood borers at three ports in Andhra Pradesh, India
2004 - IRG/WP 04-10509
Marine wood borers are a specialised group of organisms which destroy the wooden structures and cause huge monetary losses. They are site specific and their distribution depends on the water quality of a particular area. Seven species of wood borers such as Martesia striata, Teredo furcifera, T. parksi, Lyrodus pedicellatus, L. bipartita, Bankia campanellata and B. carinata have been identified in the present study. This paper deals with the nature, distribution and growth of wood borers at three ports in Andhra Pradesh, i.e. Krishnapatnam, Kakinada and Visakhapatnam during November, 1993 to October, 1995. The results of exposure trials (test coupons) are discussed in the light of available literature.
B Tarakanadha, M.Balaji, R Ramamurthi, K S Rao


Introduction of plank-built catamarans along the north coast of Andhra Pradesh, India – A development of recent origin
2003 - IRG/WP 03-10483
Hitherto, the most versatile fishing craft of the poor traditional Indian fishermen - the catamaran is made of solid timber logs of a few selected species of broad-leaved softwoods. Of late, the fishermen find it difficult to get these conventional varieties of timber chiefly because of three reasons, a) scarcity of commodity, b) prohibitive costs and c) competition from match and veneer industries. As the state of affairs is turning more and more indocile, the poor traditional fisherman is compelled to look for alternative ways to sustain his dear occupation and trade. As an outcome of such fervent desire, the fishermen in the north east coast of Andhra Pradesh initiated building up catamarans purely from the wooden planks without sacrificing much of the original shape, convenience and carrying capacity. This paper is intended to bring to light the design of such plank-built catamarans and their advantages.
M V Rao, K S Rao, M Balaji, V Kuppusamy


Leaching of CCA from Paraserianthus falcataria panels exposed to field conditions at Krishnapatnam harbour, Andhra Pradesh
2006 - IRG/WP 06-50241
This study assessed the leaching of copper, chrome and arsenic (CCA) from Paraserianthus falcataria (=Albizia falcataria) panels exposed to marine condition at Krishnapatnam harbour on the east coast of India. Metal loss was assessed in test panels after 6, 12, 24 and 36 months of exposure using Atomic Absorption spectrophotometer (AAS). The metal loss was found slightly higher in panels treated to lower loadings (16 Kg/m3) as compared to those treated to higher loadings (32 Kg/m3) at initial stages for a period of 6 months. The total metal loss in panels treated to lower loadings after 36 months was 32.1%, 22% and 31.8% for copper, chromium, arsenic respectively, while in higher loadings the loss was 28.4%, 25.2% and 28.1% for copper, chromium and arsenic respectively for the same period. Among the three metals, copper and arsenic lost slightly higher levels than chromium and the results are presented.
B Tarakanadha, K S Rao