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Articles by K. Marimuthu
Total Records ( 8 ) for K. Marimuthu
  M.P.A. Muntaziana , S.M.N. Amin , M. Aminur Rahman , A.A. Rahim and K. Marimuthu
  Snakehead (Channa striatus) belonging to the Channidae family is an indigenous freshwater fish of Malaysia that has carnivorous behavior. C. striatus command high prices since it has a strong demand and are sold alive. It is a commercially important species in Thailand, Philippines, Cambodia and Vietnam. Increased human activities destroyed the feeding and breeding grounds of this species, leading to decline in wild catches. C. striatus is considered as an endangered fish in Bangladesh. The research of C. striatus provides an account of current knowledge, especially on reproduction, culture and nutritional requirement of snakehead. The problems encountered in snakehead culture are discussed and suggestions made to overcome the problems are highlighted.
  M. Aminur Rahman , A. Arshad , K. Marimuthu , R. Ara and S.M.N. Amin
  Inter-specific hybrids have been produced to increase growth rate, improve productivity through hybrid vigor, transfer desirable traits, reduce unwanted reproduction through production of sterile fish, combine other valuable traits such as good flesh quality, disease resistance and increase environmental tolerances, better food conversion, take advantages of sexual dimorphism and increase harvesting rate in culture systems. Hybrids play a significant role for increase in aquaculture production of several species of freshwater and marine fishes; for example, hybrid catfish in Thailand, hybrid stripped bass in the USA, hybrid tilapia in Israel and hybrid characids in Venezuela. Despite its’ wide-spread use in aquaculture, there have been an impression that hybrids do not hold much attraction for aquaculturist. With the expansion of aquaculture sector and the increased number of species being bred and farmed, there are hybrids that now account for a substantial proportion of national aquaculture production and other hybrids may be emerging through further development. As the domestication of fish species increases, the possibilities to increase production through appropriate hybridization techniques is ongoing with a view to produce new hybrid fishes, especially in culture systems where sterile fish may be preferred because of the concern that fish may escape into the open freshwater, marine and coastal environment. Chromosome-set manipulation (polyploidization) has been combined with hybridization to increase the viability and to improve developmental stability of hybrid fishes. Intentional or accidental hybridization can lead to unexpected and undesirable results in hybrid progeny, such as reduced viability and growth performances, loss of color pattern and flesh quality and also raises risks to maintenance of genetic integrity of species if the hybrids escape to the natural habitat and undergo backcrosses with the parental species. The success of inter-specific hybridization can be variable and depend on the genetic structure, crossing patterns, gamete compatibility and gene flow patterns of the parental species. Appropriate knowledge on the genetic constitution of the broodstock, proper broodstock management and monitoring of the viability and fertility of the progeny of brood fishes is thus very crucial before initiating hybridization experiments. In addition, some non-generic factors such as weather conditions, culture systems, seasons and stresses associated with selecting, collecting, handling, breeding and rearing of broodstock and progeny may greatly influence hybridization success in a wide variety of freshwater and marine fin fishes.
  P. Saravanakumar , G. Dhinakaran and K. Marimuthu
  Utilization of waste materials in concrete instead of natural raw materials and by reduces the environmental pollution and energy consumption becomes the emerging topic of sustainable development. This study presents the experimental study of the possibility of producing structural concrete with Recycled Aggregate (RA) and High Volume Fly Ash (HVFA). Four groups of mixes were cast and the fresh and hardened concrete properties of Recycled Aggregate Concrete (RAC) with and without Fly Ash (FA) were compared with Natural Aggregate Concrete (NAC) and optimum replacement of RA and FA were found. Four reinforced concrete beams were cast, out of which two beams were control concrete and the other two were with 50% of RA and 50% of FA and its load deflection characteristics and crack pattern also studied. From the experimental results, it was concluded that use of 50% RA and 50% FA replacements are encouraging for structural concrete.
  M.M. Ravikumar , K. Marimuthu , P. Parthiban and H. AbdulZubar
  Lean is developing into a management tactic which improves the overall standard of an organization. This study aims, at providing a detailed outline of lean implementation helping managers to implement lean in their premises. The factors which affect lean implementing has been carved out of various literature works taking guidelines from experts from both industries and academies. For developing independent and latent variables Structural Equation Modelling is used. For organizing and taking complex decisions used for ranking alternatives analytical hierarchy process technique is used.
  S. Rajesh and K. Marimuthu
  On-line drill wear state monitoring and effective tool replacement at proper time is an important technique to be developed to realize a fully automated manufacturing system. In this study, the standard data acquisition software LabVIEW (Laboratory Virtual Instrumentation Engineering Workbench), in the application of virtual instrumentation is used to predict the drill wear states. Drilling operations have been performed in mild steel workpiece by High-Speed Steel (HSS) drill bits over a wide range of varying cutting conditions. The effective drill wear models are established based on the relationship between cutting current signals and the varying cutting parameters (cutting speed, feed and drill diameter). The cutting tool status is continuously monitored and the degree of drill wear is displayed as a percentage of the maximum permissible wear. LabVIEW facilitates defective tool replacement at the proper time based on drill wear states in the automated manufacturing environment. The effectiveness and reliability of the method are verified by experimental results.
  K. Marimuthu and M.A. Haniffa
  A total of 50 gonads of captive reared populations of spotted snake head Channa punctatus were collected from December 1998-February 1999 in southern part of India to investigate the fecundity. The average fecundity varied from 2116-11332 for brood fish of 111-181 mm length and 14.4-70.5 g body weight, respectively. The fecundity was found to be linear with respect to body length, body weight and ovary weight of the candidate fish species.
  A. Jesu Arockia Raj , A. Victor Suresh , K. Marimuthu and S. Appelbaum
  An experiment was conducted to determine whether the application of probiotic after transportation provides the same benefit of probiotic application prior to/during transportation in improving fry survival and growth. Fry of the Indian major carp Catla catla were stocked into 2 tanks (capacity: 2000 L) for conditioning. During this time one tank was treated with probiotic at the rate of 10 ppm for 2 h. The other tank was not treated with probiotic. The fry from both treatment and control tanks were packed in plastic bags at a packing density of 400 fry L-1. The fry that previously received probiotic treatment were packed in water containing probiotic whereas the fry from the control tank was packed in water without probiotic. The bags were transported to the laboratory and unpacked after 13 h. Treatment with probiotic resulted in higher survival (98.4%) whereas fry not treated with probiotic had a mean survival of 92.5%. Post-transportation, the fry in each bag were stocked in individual, shallow, plastic tanks at a density of 25 fry L-1 and reared for five days. The fry that were administered probiotic during transportation were either treated with probiotic or not treated during this period. Similarly, the fry that were not administered probiotic during transportation, were either treated with probiotic or not treated. Wherever applicable, probiotic was added at the rate of 10 ppm per day after water exchange, but before first feeding. They were fed ad libitum three times per day. Fry that were treated with probiotic throughout the trial gave the highest survival (95.2%) and growth (mean final weight = 1060 mg).
  K. Marimuthu , R.T. Karunakaran , S. Surendra Babu , G. Muralidharan , S. Arumugam and C.K. Jayasankar
  Eu3+-doped alkali fluoroborate glasses B2O3–XCO3–NaF–Eu2O3 (where X = Li2, Na2, K2, and Ca, Mg) have been prepared using the conventional melting technique and their structural and optical properties have been evaluated. The XRD pattern of the glasses confirmed the amorphous nature and the FTIR spectra reveal the presence of BO3 and BO4 units as their local structures along with the strong OH groups. From the absorption spectra the bonding parameters have been calculated and confirmed that the Eu–O bonds in the studied glasses are of covalent nature. Judd–Ofelt (JO) analysis has been carried out from the emission spectra. The JO parameters have been used to calculate transition probabilities (A), lifetime (τR) and branching ratios (βR) and peak stimulated emission cross-section (δPE) for the 5D07FJ (J = 1, 2, 3 and 4) transitions of the Eu3+ ions. The decay from the 5D0 level of Eu3+ ions in the title glasses has been measured and analysed. The lifetime of the 5D0 level is found to be shorter than the reported glasses which may be due to the presence of OH groups.
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