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RISS 인기검색어
- 검색키워드
- 저자 : Singh Jaydeep (검색결과 3 건)
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Thin and Broadband Two‑Layer Microwave Absorber in 4–12 GHz with Developed Flaky Cobalt Material
Neeraj Gill,Jaydeep Singh,Smitha Puthucheri,Dharmendra Singh 대한금속·재료학회 2018 ELECTRONIC MATERIALS LETTERS Vol.14 No.3
Microwave absorbing materials (MAMs) in the frequency range of 2.0–18.0 GHz are essential for the stealth and communicationapplications. Researchers came up with effective MAMs for the higher frequency regions, i.e., 8.0–18.0 GHz,while absorbers with comparable properties in the lower frequency band are still not in the limelight. Designing a MAMfor the lower frequency range is a critical task. It is known that the factors governing the absorption in this frequency predominantlydepend on the permeability and conductivity of the material, whereas the shape anisotropy of the particles caninitiate different absorption mechanisms like multiple internal reflections, phase cancellations, surface charge polarizationand enhanced conductivity that can promote the microwave absorption towards lower frequencies. But the material alone maynot serve the purpose of getting broad absorption bandwidth. With the effective use of advanced electromagnetic techniquelike multi-layering this problem may be solved. Therefore, in this paper, a material with shape anisotropy (cobalt flakes withhigh shape anisotropy) has been prepared and a two-layer structure is developed which gives the absorption bandwidth in4.17–12.05 GHz at a coating thickness of 2.66 mm.
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Rajput Akanksha,Singh Narendra,Singh Jaydeep,Rastogi Shantanu 한국기상학회 2024 Asia-Pacific Journal of Atmospheric Sciences Vol.60 No.2
Limited observations hinder understanding of turbulent characteristics in mountainous terrain resulting from heating or cooling of slopes, wind, vertical motions, and heat or moisture advection, which disperse aerosols and other pollutants over the region. In this study, the 1290 MHz radar wind profiler data are utilized to compute the boundary layer height (BLH), the refractive index structure constant (Cn 2), and the energy dissipation rate (ɛ) over the central Himalayan site for the period of November 2011 to March 2012, from the intense Ganges Valley Aerosol Experiment (GVAX) field measurements. The radar wind profiler (RWP) based estimation of BLH and ɛ is validated against the radiosonde, representing the effectiveness of the datasets for further investigation. The strong seasonal variation of log Cn 2 and log ɛ, with average values of ≈ -12 m−2/3 and -2 m2 s−3, respectively, is associated with the mountain-induced local circulations and stability in the atmospheric boundary layer. The weak stratification during weak flow is found to be responsible for deep mixing, particularly in the nocturnal boundary layer in spring. Furthermore, the level of cloud cover significantly impacts the strength of turbulence, with the highest cloud cover resulting in a substantial increase in log Cn 2 (approximately -11 m−2/3) due to intense updraft and downdraft motions compared to clear skies. Additionally, the distribution of aerosol loading across the site, coupled with the behavior of BLH, atmospheric stability, and orographic-induced circulations, implies distinctive seasonal mechanisms for transporting aerosols toward the mountains. This study offers valuable insights into the diurnal and seasonal patterns of turbulent mixing and the mechanisms behind the transport of pollutants through boundary layer processes over the region.
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Screening tomato genotypes for resistance to early blight and American serpentine leafminer
Suresh Reddy Yerasu,Loganathan Murugan,Jaydeep Halder,H. C. Prasanna,Arpita Singh,B. Singh 한국원예학회 2019 Horticulture, Environment, and Biotechnology Vol.60 No.3
In this study, 21 tomato accessions of the ICAR-Indian Institute of Vegetable Research, Varanasi, gene bank were screenedfor resistance to early blight and leafminer. For early blight resistance, artifi cial screening was conducted for 40-day-old(in 2013–2014) and 70-day-old (in 2012–2013) plants, and fi eld screening was carried out during 2012–2013. Screeningfor leafminer damage was done only under screen house conditions during 2012–2013. Tomato wild accessions, namely,EC520078, WIR3928, and WIR3957, showed a lower percent disease incidence of early blight at two diff erent growth stagesin artifi cial disease inoculation conditions and in fi eld conditions. The percent disease incidence of the genotypes was 5.98,7.22, and 16.48% at 40 days old; 14.59, 12.33, and 16.73% at 70 days old under artifi cial screening, and 8, 8.65, and 15.12%under fi eld conditions, respectively. The same genotypes recorded lower leafminer damage in screen house conditions, andthe percentage of leafminer damage was 3.92, 4.55, and 5.91%. These tomato wild accessions are being used as a source ofresistance in early blight and leafminer resistance-breeding programs.
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