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Gowtham, V.
- Detection of a Spectrum at the Receiver in a CR Network
Abstract Views :163 |
PDF Views:2
Authors
Affiliations
1 Department of Electronics and Communication, Tamilnadu College of Engineering, IN
1 Department of Electronics and Communication, Tamilnadu College of Engineering, IN
Source
Fuzzy Systems, Vol 6, No 2 (2014), Pagination: 49-51Abstract
Cognitive radio is being touted as the next Big Bang in wireless communication. A large part of the usability of cognitive radio rests upon its ability to detect white spaces in the spectrum, i.e. to detect the presence of the primary or licensed user. As such, spectrum sensing occupies most of the research potential as far as cognitive radio is concerned, and in this paper, a spectrum sensing technique will be looked upon. A optimal detector for spectrum sensing can be reduced to other well-known detectors, three signal processing techniques, viz. matched-filter, energy detection and cyclostationarity detection, is considered. Of special interest is the topic of cooperative sensing, where a number of cognitive nodes can interact with each other or a master node to efficiently carry out the spectrum sensing, often more effectively. We look at a technique, varying from narrowband to wideband detection, with special emphasis on optimal data and decision fusion. Finally, we consider one detection technique, which can be applied when the frequency information about the channel or the primary signal is available.
- Study on the Effectiveness of Pesticides against Cowpea Aphid (Aphis craccivora) Koch
Abstract Views :135 |
PDF Views:1
Authors
Affiliations
1 College of Agricultural Technology, Theni (T.N.), IN
1 College of Agricultural Technology, Theni (T.N.), IN
Source
International Journal of Plant Protection, Vol 9, No 1 (2016), Pagination: 146-149Abstract
Considering the importance of safe food, avoiding of excess pesticide application and pesticide pollution the present study was conducted. In this experiment totally four pesticides were tested against cowpea aphid Aphis craccivora under pot culture experiment at College of Agricultural Technology, Theni. Among the four acetamprid 20 SP (0.125g/ml) proved highly effective against Aphis craccivora compared to the rest of the pesticides with mortality of 98.75 per cent. In case of dosage wise acetamprid 20 SL (0.125g/ml) and imidacloprid17.8 SL(0.25ml/l) proved to be highly effective with mortality percentage of 98.33 and 86.66, respectively. Thus, it is concluded that all the studied pesticides, Acetamprid proved effective to control the cowpea aphids.Keywords
Chemical Pesticide, Efficiency, Cowpea, Aphid.- Effect of Neem Oil Based Nanoemulsion on Egg Parasitoid, Trichogramma chilonis (Ishii) (Hymenoptera: Trichogrammatidae)
Abstract Views :248 |
PDF Views:135
Authors
Affiliations
1 Department of Nano Science and Technology, TNAU, Coimbatore - 641003, Tamil Nadu, IN
2 Department of Agricultural Entomology, TNAU, Coimbatore - 641003, Tamil Nadu, IN
1 Department of Nano Science and Technology, TNAU, Coimbatore - 641003, Tamil Nadu, IN
2 Department of Agricultural Entomology, TNAU, Coimbatore - 641003, Tamil Nadu, IN
Source
Journal of Biological Control, Vol 32, No 2 (2018), Pagination: 103-107Abstract
Botanical biopesticides are alternative to hazardous synthetic insecticides. In the present study neem oil based nanoemulsion was synthesized using neem oil and tween 80. The particle size was estimated as 159.2 nm. The emulsion was characterized using particle size analyzer and TEM to confirm the formation of nano emulsion of neem oil. Trichogramma chilonis (Ishii) is an effective egg parasitoid of lepidopterous pests. It controls pests in eggs stage prior to its damaging to crops. The parasitoid is vulnerable to insecticides or oil sprays applied to the crops. The present study revealed the effects of neem nanoemulsion with T. chilonis under the controlled laboratory conditions. Different concentrations i.e., 50, 100, 500, 1000, 5000, 10000 ppm were tested on T. chilonis. The biological effects viz., per cent parasitism, adult emergence were found significantly reduced and increased mortality in all the concentrations of macroemulsion of neem oil (66.78 ± 0.50, 71.69± 1.02; 48.45 ± 0.35, 52.26 ± 0.60; 31.75 ± 0.35, 26.00 ± 0.39 in 10000 and 5000 ppm, respectively) as compared with nanoemulsion (75.40 ± 0.03, 78.26 ± 0.29; 52.50 ± 0.52, 57.85 ± 0.60; 19.57 ± 0.27, 16.25 ± 0.25 in 10000 and 5000 ppm, respectively and control (88.00 ± 0.12; 82.00 ± 1.26; 2.25 ± 0.02, respectively). These studies showed that the 10000 and 5000 ppm concentrations of nanoemulsion of neem oil were found less toxic to T. chilonis.Keywords
Biological Effects, Nanoemulsion, Neem Oil, Trichogramma Chilonis.Full Text
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