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RISS 인기검색어
- 검색키워드
- 저자 : Devinder Sharma (검색결과 8 건)
- 무료
- 기관 내 무료
- 유료
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Contact Toxicity of Some Insecticides to Honeybee Apis mellifera (L.) and Apis cerana (F.)
Devinder Sharma,Dharam Pal Abrol 한국응용곤충학회 2005 Journal of Asia-Pacific Entomology Vol.8 No.1
Contact toxicities of five insecticides viz. malathion, demeton-s-methyl, cypermethrin, deltamethrin and fenvalerate applied to foragers of honeybee Apis mellifera (L.) and Apis cerana (F.) were established. Each insecticide was evaluated at three levels of concentrations for contact toxicity under laboratory conditions. The mortality of honeybees increased with increase in concentration and exposure time. No quick knockdown effect was observed in all insecticides tested. The order of toxicity of different insecticides after 8h of treatment was in the order: malathion > cypermethrin > demeton-s- methyl > fenvalerate > deltamethrin for A. mellifera and malathion> demeton-s-methyl> cypermethrin > fenvalerate > deltamethrin for A. cerana. All the insecticides were highly toxic to honeybees.
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Contact Toxicity of Some Insecticides to Honeybee Apis mellifera (L.) and Apis cerana (F.)
Sharma Devinder,Abrol Dharam Pal Korean Society of Applied Entomology 2005 Journal of Asia-Pacific Entomology Vol.8 No.1
Contact toxicities of five insecticides viz. malathion, demeton-s-methyl, cypermethrin, deltamethrin and fenvalerate applied to foragers of honeybee Apis mellifera (L.) and Apis cerana (F.) were established. Each insecticide was evaluated at three levels of concentrations for contact toxicity under laboratory conditions. The mortality of honeybees increased with increase in concentration and exposure time. No quick knockdown effect was observed in all insecticides tested. The order of toxicity of different insecticides after 8h of treatment was in the order: malathion > cypermethrin > demeton-s-methyl > fenvalerate > deltamethrin for A. mellifera and malathion > demeton-s-methyl > cypermethrin > fenvalerate > deltamethrin for A. cerana. All the insecticides were highly toxic to honeybees.
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Devinder Priyadarshi,Rajesh Kumar Sharma 대한기계학회 2016 JOURNAL OF MECHANICAL SCIENCE AND TECHNOLOGY Vol.30 No.3
Aluminium matrix composites (AMCs) now hold a significant share of raw materials in many applications. It is of prime importance to study the machinability of such composites so as to enhance their applicability. Sufficient work has been done for studying the machining of AMCs with particle reinforcements of micron range. This paper presents the study of AMCs with particle reinforcement of under micron range i.e. nanoparticles. This paper brings out the results of an experimental investigation of type and weight percent of nanoparticles on the tangential cutting force during turning operation. SiC, Gr and SiC-Gr (in equal proportions) were used with Al-6061 alloy as the matrix phase. The results indicate that composites with SiC require greater cutting force followed by hybrid and then Gr. Increase in the weight percent also significantly affected the magnitude of cutting force. RSM was used first to design and analyze the experiments and then to optimize the turning process and obtain optimal conditions of weight and type of reinforcements for turning operation.
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Devinder Singh,Sushma Sharma,Arun Mahajan,Suram Singh,Rajinder Singh 대한화학회 2013 Bulletin of the Korean Chemical Society Vol.34 No.6
Intergrowth perovskite type complex oxides La0.8Ln0.2Sr2MnCrO7-δ (Ln=La, Nd, Gd, and Dy) have been synthesized by sol-gel method. Rietveld profile analysis shows that the phases crystallize with tetragonal unit cell in the space group I4/mmm. The unit cell parameters a and c decrease with decreasing effective ionic radius of the lanthanide ion. The magnetic studies suggest that the ferromagnetic interactions are dominant due to Mn3+–O–Mn4+ and Mn3+–O–Cr3+ double exchange interactions. Both Weiss constant (θ) and Curie temperature (TC) increase with decreasing ionic radius of lanthanide ion. It was found that the transport mechanism is dominated by Mott’s variable range hopping (VRH) model with an increase of Mott localization energy.
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Singh, Devinder,Sharma, Sushma,Mahajan, Arun,Singh, Suram,Singh, Rajinder Korean Chemical Society 2013 Bulletin of the Korean Chemical Society Vol.34 No.6
Intergrowth perovskite type complex oxides $La_{0.8}Ln_{0.2}Sr_2MnCrO_{7-{\delta}}$ (Ln=La, Nd, Gd, and Dy) have been synthesized by sol-gel method. Rietveld profile analysis shows that the phases crystallize with tetragonal unit cell in the space group I4/mmm. The unit cell parameters a and c decrease with decreasing effective ionic radius of the lanthanide ion. The magnetic studies suggest that the ferromagnetic interactions are dominant due to $Mn^{3+}$-O-$Mn^{4+}$ and $Mn^{3+}$-O-$Cr^{3+}$ double exchange interactions. Both Weiss constant (${\theta}$) and Curie temperature ($T_C$) increase with decreasing ionic radius of lanthanide ion. It was found that the transport mechanism is dominated by Mott's variable range hopping (VRH) model with an increase of Mott localization energy.
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D. P. Abrol,Devinder Sharma 한국양봉학회 2011 韓國養蜂學會誌 Vol.26 No.3
The studies conducted during 2005~06 to evaluate the relative toxicity and amorphogenic effects of imidacloprid and demeton-o-methyl on the honeybee brood (A. mellifera) revealed that both demeton -o-methyl and Imidacloprid were highly toxic to eggs and 1~2 day old larvae at all the concentrations as no eggs or larvae survived. Demeton-o-methyl were also found to be highly toxic to 3~4 and 5~6 days old larvae at recommended concentration resulting in complete mortality of treated larvae. However, at half and one fourth of recommended concentrations larval mortality and number of deformed bees significantly decreased. Imidcaloprid was highly toxic to 5~6 days old larvae at recommended and half of recommended concentrations, resulting in complete mortality of treated larvae. However, at one fourth of recommended concentrations, larval mortality and number of deformed bees significantly decreased. The deformed individuals were discoloured, smaller in size having reduced body weight and other dimensions. Wings were absent or rudimentary. Similarly, Carbaryl proved highly toxic to eggs. At the recommended and half of the recommended concentrations all the eggs in the cells treated with carbaryl died and no cell was capped. However at one fourth of the recommended concentration, mortality was 76.67 percent. 1~2 and 3~4 days old larvae were highly susceptible to the recommended concentration (0.10%). There was 100 per cent mortality of larvae treated with recommended concentration. No capping occurred. However, 5~6 day old larvae were less susceptible to recommended concentration as compared to 1~2 and 3~4 day old larvae. Capping of the cells was also abnormal and emergence occurred on 23<SUP>rd</SUP> day in all the insecticides except endosulfan. Endosulfan was relatively safer to honeybee brood.
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Mass Rearing of Apis cerana F. Queen
Dharam Pal Abrol,R. M. Bhagat,Devinder Sharma 한국응용곤충학회 2005 Journal of Asia-Pacific Entomology Vol.8 No.3
The conditions that determine the sucess ofmass rearing of Apis cerana F. queens were studied.It was found that artificial quen cell cups with the internal diameter of 6.2mm at base 8.6mm at the mouth and 8.8mm depth were highly preferred by the bees for rearing of queens from the grafted larvae. Likewise, the wax obtained from old comb foundation was pre-tance was recorded for 12 and 6 number of larval grafts. High percentage and mean volume of queen cells was obtained from 12-6hr. old grafts. However, no signi-ficant diferences were observed between grafts and those provided with royal jely. The same was true for single and double grafts. The percentage acceptance was in the order: March, April, August, and September.
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Mass Rearing of Apis cerana F. Queen
Abrol Dharam Pal,Bhagat R. M.,Sharma Devinder Korean Society of Applied Entomology 2005 Journal of Asia-Pacific Entomology Vol.8 No.3
The conditions that determine the success of mass rearing of Apis cerana F. queens were studied. It was found that artificial queen cell cups with the internal diameter of 6.2mm at base 8.6mm at the mouth and 8.8mm depth were highly preferred by the bees for rearing of queens from the grafted larvae. Likewise, the wax obtained from old comb foundation was preferred over fresh comb foundation. Maximum acceptance was recorded for 12 and 6 number of larval grafts. High percentage and mean volume of queen cells was obtained from 12-6hr. old grafts. However, no significant differences were observed between grafts and those provided with royal jelly. The same was true for single and double grafts. The percentage acceptance was in the order: March, April, August, and September.
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