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On the secrecy performance of RIS-enabled wireless communications over Nakagami-m fading channels
Ashutosh K. Yadav,Suneel Yadav,Anshul Pandey,Adão Silva 한국통신학회 2023 ICT Express Vol.9 No.3
This paper examines the secrecy performance of reconfigurable intelligent surface aided wireless communication systems. Specifically, we derive the secrecy outage probability (SOP), intercept probability, probability of non-zero secrecy capacity, and ergodic secrecy capacity (ESC) expressions over Nakagami-m fading channels. We further evaluate the asymptotic SOP expressions to get some insights into the secrecy diversity order under two scenarios of interest; (1) when the signal-to-noise ratio approaches infinity, and (2) when the main-to-eavesdropper ratio tends to infinity. Also, we analytically show the effect of reflecting element density on the ESC performance. The numerical and simulation studies verify our analytical findings.
Photo Physical Studies of PVP Arrested ZnS Quantum Dots
Ashutosh Kumar Shahi,Bishnu Kumar Pandey,Bheeshma Pratap Singh,Bipin Kumar Gupta,Sukhvir Singh,Ram Gopal 대한금속·재료학회 2017 ELECTRONIC MATERIALS LETTERS Vol.13 No.2
Monodispersed polyvinylpyrrolidone (PVP) arrested ZnS quantumdots (QDs) having diameter in range ~2-5 nm are synthesized by acolloidal precipitation method using PVP as the stabilizing agent. X-ray diffraction (XRD), transmission electron microscopy (TEM),high resolution transmission electron microscopy (HRTEM),selective area electron diffraction (SAED) and Fourier transforminfrared (FT-IR) spectroscopy are probed to investigate thestructural information. The optical properties are studied usingdiffuse UV-visible reflectance and photoluminescence (PL)spectroscopy techniques. TEM images as well as XRD reflectionpeak broadening indicate the nanometer size particles formationwith cubic (sphalerite) phase within the polymer matrix. Opticalabsorbance studies reveal an excitonic peak at around ~310 nmdictates the effect of quantum confinement effect in the ZnS QDs. PL emission spectra for ZnS QDs in PVP exhibit four emissionpeaks at ~382 nm, ~414 nm, ~480 nm and ~527 nm are observed. These excitonic emissions from ZnS QDs are caused by theinterstitial sulfur/Zn vacancies and surface states.
Identifying the Critical Risk Factors for Road Crashes based on Large-Scale Safety Audits in India
Satyajit Mondal,Ashutosh Pandey,Ankit Gupta,Agnivesh Pani 대한토목학회 2023 KSCE Journal of Civil Engineering Vol.27 No.11
Road transportation is considered one of the most essential factors for the growth of a country. Due to the exponential growth in population and fast urbanization, the existing roadway facilities are facing a huge surge in vehicle growth. But this development is also accompanied by the concerning growth of road crashes. To mitigate road crashes, one needs to identify the potential risk factors involved with them. This requires detailed accident data, which is sometimes difficult to acquire and in addition, there is a high probability of accidents in many places due to various hazardous situations, but there may not be an accident record yet. Road Safety Audit is an alternative approach that can overcome these obstacles. Hence, the present study has attempted to highlight various risk factors involved with road crashes for four different road facilities type, viz. Straight, intersection, curve, and road with culvert and flyovers (RCF) by conducting the Road Safety Audit for 216 black spots. Analytic Hierarchy Process (AHP) was performed on the data collected from the audit process to determine the weightage of involvement of each factor in road crashes and identify the most significant ones.
Ionic liquid assisted recovery of cobalt and nickel metals from spent lithium-ion batteries (LIBs)
( Raj Tirath ),( Raj Morya ),( Ashutosh Kumar Pandey ),( Sang-hyoun Kim ) 한국폐기물자원순환학회 2022 ISSE 초록집 Vol.2022 No.-
Lithium-ion batteries (LIBs) have become an essential component of the energy supply chain for transportation (in electric vehicles) and renewable energy storage systems. This surge in demand necessitates an increase in production, which, in turn, results in a large number of waste LIBs. LIB cathode material primarily contains heavy metal elements such as nickel (Ni) and cobalt (Co), which are potentially hazardous to human health and the environment if discarded improperly. The leaching of Co and Ni into various water streams has become an environmental hazard and is continuously affecting human health through the food chain. Thus, recycling spent LIBs has gotten a lot of attention because it provides a cost-effective way to ensure a steady supply of these metals for LIB remanufacturing. Thus, recycling spent LIBs has received a lot of attention because it offers a cost-effective way to ensure a steady supply of these metals for LIB remanufacturing while also encouraging safer environmental load reduction. Solvent extraction is the most widely accepted method for separating these metals, but traditional extractants employed in conjunction with molecular diluents often lack selectivity and cause major environmental hurdles. Thus, the present study demonstrated a state-of-the-art approach for the recovery of cobalt and nickel from waste LIBs using green ionic liquids, which is such as recycling from a sustainable perspective. Ionic liquids are molten salts of organic cation and inorganic/ organic anion and are considered as green solvents. Here in, two halogen-free, low viscous, biocompatible fatty acid-based hydrophobic ionic liquids (ILs) were synthesized, characterized, and used to recover cobalt, Co(II), and nickel, Ni(II), from aqueous solutions. The extraction behaviors of Co(II) and Ni(II) were studied further by varying the equilibrium time, ILs molar concentration, metal loading, and temperature. Thermodynamic parameters such as enthalpy change and Gibbs free energy change were also investigated showed that metal recovery is governed by metal transfer phenomenon. Study revealed that fatty acid-based ILs were found to be capable of extracting > 99 % Co(II) and Ni(II) from aqueous solutions at 298 K in 15 minutes using a 1:1 (org: aq.) ratio at low concentrations of 2.5 to 10 g L<sup>-1</sup>. Furthermore, when the metal concentration was greater than 10 g L<sup>-1</sup>, Co(II) extraction was preferred over Ni(II) extraction for methyltrioctylammonium oleate IL.
A NEUMANN TYPE PROBLEM ON AN UNBOUNDED DOMAIN IN THE HEISENBERG GROUP
Dubey, Shivani,Mishra, Mukund Madhav,Pandey, Ashutosh Korean Mathematical Society 2022 대한수학회지 Vol.59 No.3
We discuss the wellposedness of the Neumann problem on a half-space for the Kohn-Laplacian in the Heisenberg group. We then construct the Neumann function and explicitly represent the solution of the associated inhomogeneous problem.
A Neumann type problem on an unbounded domain in the Heisenberg group
Shivani Dubey,Mukund Madhav Mishra,Ashutosh Pandey 대한수학회 2022 대한수학회지 Vol.59 No.3
We discuss the wellposedness of the Neumann problem on a half-space for the Kohn-Laplacian in the Heisenberg group. We then construct the Neumann function and explicitly represent the solution of the associated inhomogeneous problem.