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RISS 인기검색어
- 검색키워드
- 저자 : Prabhat, Naveen (검색결과 92 건)
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Prabhat Kumar 한국응용곤충학회 2008 Journal of Asia-Pacific Entomology Vol.11 No.4
In a choice test, loss of bio-efficacy (1–30 days) of neem (seed and soil application) were studied in a naturally ventilated and lighted greenhouse (semi-field conditions) using a commercial neem product (NeemAzal-U 17%) against Bemisia tabaci Gennadius (Hom., Aleyrodidae) on tomatoes. The fresh neem residue had the strongest effects in all parameters (adult colonisation behaviour, eggs deposition, eggs hatch and immature mortality). This effect decreased gradually over the time. The bio-efficacy loss of neem applied through seed treatment was rapid, and tomato plants grown from seed soaked in neem effectively managed B. tabaci only until the 15-day post application. Soil application was a more stable method to prolong the bioefficacy of neem against B. tabaci under greenhouse conditions. The bio-efficacy of soil neem application were recorded daily for 1–7-day and during this period, the immature mortality, which was 88.20% for the first day reduced to almost half i.e. 45.01%. The results of the experiments are discussed in context of potential use of neem-based pesticides for Integrated Pest Management of sucking insect-pests in open field or in greenhouse conditions. In a choice test, loss of bio-efficacy (1–30 days) of neem (seed and soil application) were studied in a naturally ventilated and lighted greenhouse (semi-field conditions) using a commercial neem product (NeemAzal-U 17%) against Bemisia tabaci Gennadius (Hom., Aleyrodidae) on tomatoes. The fresh neem residue had the strongest effects in all parameters (adult colonisation behaviour, eggs deposition, eggs hatch and immature mortality). This effect decreased gradually over the time. The bio-efficacy loss of neem applied through seed treatment was rapid, and tomato plants grown from seed soaked in neem effectively managed B. tabaci only until the 15-day post application. Soil application was a more stable method to prolong the bioefficacy of neem against B. tabaci under greenhouse conditions. The bio-efficacy of soil neem application were recorded daily for 1–7-day and during this period, the immature mortality, which was 88.20% for the first day reduced to almost half i.e. 45.01%. The results of the experiments are discussed in context of potential use of neem-based pesticides for Integrated Pest Management of sucking insect-pests in open field or in greenhouse conditions.
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Numerical and theoretical modelling of low velocity impact on UHPC panels
Prabhat R. Prem,Mohit Verma,A. Ramachandra Murthy,J. Rajasankar,B.H. Bharatkumar 국제구조공학회 2017 Structural Engineering and Mechanics, An Int'l Jou Vol.63 No.2
The paper presents the studies carried out on low velocity impact of Ultra high performance concrete (UHPC) panels of size 350X350X10 mm3 and 350X350X15 mm3. The panels are cast with 2 and 2.5% micro steel fibre and compared with UHPC without fiber. The panels are subjected to low velocity impact, by a drop-weight hemispherical impactor, at three different energy levels of 10, 15 and 20 J. The impact force obtained from the experiments are compared with numerically obtained results using finite element method, theoretically by energy balance approach and empirically by nonlinear multigenetic programming. The predictions by these models are found to be in good coherence with the experimental results.
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Prabhat Kumar Sahu,Jungyu Kim,Kwanghee Park,Eunchan Kim,Saptarsi Mondal,Kyungwon Kwak,Minhaeng Cho 대한화학회 2022 Bulletin of the Korean Chemical Society Vol.43 No.2
Lithium-ion battery (LIB) electrolytes based on room-temperature ionic liquids (RTIL) are promising as safe and sustainable LIB electrolytes. However, there are no reports on the solvation structure and dynamics of RTIL due to the existence of various solvation species in RTIL. Here, we investigated the solvation structure and dynamics of binary mixtures of the phosphonium ionic liquid, tributyl(2-methoxyethyl)phosphonium bis(trifluoromethanesulfonyl)imide (P444102TFSI), and methylthiocyanate (CH3SCN), with ultrafast mid-IR Spectroscopy. The changes of vibrational and rotational dynamics of CH3SCN∙∙∙Li+ complex and free CH3SCN with an increase in CH3SCN concentration suggest the presence of at least four solvation species, providing superior resolving power for various solvation species existing in complex LIB electrolytes. Our experimental results show that the environment of free CH3SCN and CH3SCN∙∙∙Li+ complex changes drastically with change in CH3SCN mole fraction and Li salt concentration in the mixture. We expect that this can affect the Li-ion transport mechanism in the IL-based electrolytes.
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Prabhat Vashistha,박성우,표석훈 한국콘크리트학회 2022 International Journal of Concrete Structures and M Vol.16 No.6
The amendment of cementitious binders with waste materials aids as a path to reduce the volume of waste and carbon emission. This review summarizes the current state of practice for cementitious binder fabrication in favor to the utilization of waste materials such as waste concrete powder (WCP), coal bottom ash (CBA) and steel slags. These materials have the potential to be employed as cementitious material, however much of the application is still up to the laboratory scale. This manuscript will serve as the support to understand the utilization of mentioned waste as nontraditional cementitious products. The highlighted areas likely need more refinement and research with indication on possible negative impact on application of wastes. The use of the aforementioned wastes for blending with OPC (ordinary Portland cement) can reduce carbon emissions from cement manufacturing. Additionally, it can also reduce the use of natural resources during clinker production.
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Prabhat Khanal,Mette Olaf Nielsen 한국식품영양과학회 2019 Preventive Nutrition and Food Science Vol.24 No.3
Nepal and many developing countries are currently suffering from increased prevalence of obesity, type 2 diabetes, and other metabolic disorders. Unhealthy dietary habits and physical inactivity are traditionally considered as responsible factors for these disorders. The relatively new concept of foetal programming suggests that development of metabolic diseases later in life may be associated with poor nutritional status in utero, and such phenomenon could be amplified by subsequent exposure to unhealthy diets after birth. We suggest that foetal programming and mismatched nutritional situations during foetal and postnatal life are important causative factors for increased prevalence of obesity and metabolic disorders in Nepal. Issues highlighted in this paper may also be relevant to other developing countries with similar socioeconomic status. Undernutrition in foetal life can predispose for visceral fat deposition and may alter dietary preferences towards unhealthy diets, amplifying the risk of nutritional mismatch after birth; this can lead to metabolic disturbances in a number of pathways including glucose and lipid metabolism. Providing attention to early life nutrition could therefore be an important tool to reduce the prevalence of lifestyle diseases in Nepal. Future national health policies should thus include changes in research and intervention activities towards preventing averse early life nutritional programming. Availability of free-of-cost and mandatory nutritional education and medical services to pregnant women and their families and better management of national health care systems including digitalization of national health data could be viable strategies to achieve these goals.
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Some aspects of magnetohydrodynamics flow on flat plate with suction
Prabhat Kumar,Manjula Alloli,C.K.Subbaraya 장전수학회 2019 Advanced Studies in Contemporary Mathematics Vol.29 No.3
A simple solution for the hydrodynamic linear equations for two dimensional flow, past a flat plate, in the presence of constant suction, have been obtained when the free stream follows exponential (increasing or decreasing) law. Asymptotic behavior of the transient motion has been discussed in detail which is particularly important in the decreasing case. Skin-friction follows exponentially increasing or decreasing laws respectively, with the parameter n, in the two cases.
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Prabhat Kumar Rai 국립중앙과학관 2016 Journal of Asia-Pacific Biodiversity Vol.9 No.1
In recent Anthropocene, biodiversity of urban roadside plants is now increasingly being realized as an eco-sustainable tool for monitoring and mitigation of air pollution. The present study aimed to investigate the impact of particulate matter (PM) pollutants on leaf morphology (stomata), biochemical (heavy metals, protein, and sugars) parameters and enzyme activity (peroxidase and catalase) of 12 common roadside plant species, growing at two different sites of Aizawl City, i.e. the Ramrikawn (RKN-Med; polluted peri-urban) site and the Mizoram University (MZU-Low; less polluted rural) site. The highest dust deposition was noted for the RKN-Med site on Ficus benghalensis and the lowest in Bauhinia variegate. The plant species growing at the RKN-Med site showed significant decreases in stomatal size and stomatal index (p ˂ 0.05). Further, increased concentration of heavy metals (Fe, Cu, and Zn) was recorded at the RKN-Med site. Moreover, tolerant roadside plants find their suitability for plantation in ecologically sensitive regions, having implications for urban ecosystem restoration.
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Application of Nanotechnology in Food Packaging: An Overview
Prabhat Kumar Mandal,이치호,K. Choi,민상기 한국축산식품학회 2009 한국축산식품학회지 Vol.29 No.4
Nanotechnology is the engineering of functional systems at the molecular scale. It has the potential to revolutionize the global food system. Novel agricultural and food security systems, disease treatment delivery methods, and molecular and cellular biology sensors for pathogen detection, environmental protection, and education of the public and the future workforce are examples of the possible important impact of nano-technology on the science and engineering of agriculture and food systems. Nanotechnology allows designers to alter the structure of packaging materials on a molecular scale, to give the materials desired properties. Simple traditional “packaging” is being replaced with multi-functional intelligent packaging to improve food quality with the application of nanotechnology. With a different nanostructure, plastics can have improved gas/water vapor permeability to fit the requirements for the preservation of fruits, vegetables, beverages, and other foods. By adding nanoparticles, it is possible to produce bottles and packages with lighter resistance, stronger mechanical and thermal properties, and less gas absorption. These properties can significantly increase the shelf life, efficiently preserve the flavor and color, and facilitate the transport of food. Furthermore, nanostructured film can effectively prevent the invasion of bacteria and microorganisms in food and thus ensure food safety. With embedded nanosensors in packaging, consumers will be able to “read” the list of ingredients of various food items. Sensors can issue an alarm against food spoilage or provide precise nutritional information on food contents. Nanotechnology is expected to change the entire packaging industry. Self-assembly will reduce fabrication costs and infrastructure, and more flexible packaging methods will provide consumers with fresher and more customized products. Nanotechnology is the engineering of functional systems at the molecular scale. It has the potential to revolutionize the global food system. Novel agricultural and food security systems, disease treatment delivery methods, and molecular and cellular biology sensors for pathogen detection, environmental protection, and education of the public and the future workforce are examples of the possible important impact of nano-technology on the science and engineering of agriculture and food systems. Nanotechnology allows designers to alter the structure of packaging materials on a molecular scale, to give the materials desired properties. Simple traditional “packaging” is being replaced with multi-functional intelligent packaging to improve food quality with the application of nanotechnology. With a different nanostructure, plastics can have improved gas/water vapor permeability to fit the requirements for the preservation of fruits, vegetables, beverages, and other foods. By adding nanoparticles, it is possible to produce bottles and packages with lighter resistance, stronger mechanical and thermal properties, and less gas absorption. These properties can significantly increase the shelf life, efficiently preserve the flavor and color, and facilitate the transport of food. Furthermore, nanostructured film can effectively prevent the invasion of bacteria and microorganisms in food and thus ensure food safety. With embedded nanosensors in packaging, consumers will be able to “read” the list of ingredients of various food items. Sensors can issue an alarm against food spoilage or provide precise nutritional information on food contents. Nanotechnology is expected to change the entire packaging industry. Self-assembly will reduce fabrication costs and infrastructure, and more flexible packaging methods will provide consumers with fresher and more customized products.
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