Publications by authors named "Rajiv Kumar Singh"

In this study, we examined carrier conduction in a CsBiI (CBI) perovskite through a dual-probe approach using both optical and electrical measurements. We observed that the open-circuit voltage and photocurrent with light intensity follow the ∝ and ∝ relationships, attributed to nonradiative recombination losses and trapping of carriers. Excitation power-dependent photoluminescence behavior indicates the influence of the self-trapped exciton (STE) and strong phonon perturbation at high excitation powers in the CBI lattice.

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This study investigates the integration of electromagnetic (EM) radiation with quantum factorial networks to enhance Wi-Fi hotspot performance through a comprehensive experimental framework.A novel quantum factorial network architecture was developed, leveraging quantum superposition and entanglement principles to optimize wireless communication systems. The experimental methodology employed MATLAB/Simulink simulations with 100 network nodes operating at 2.

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This research introduces a novel quantum-enhanced intelligent system tailored for personalized adaptive radiotherapy dose estimation. The system efficiently models radiation transport and predicts patient-specific dose distributions by integrating quantum algorithms, deep learning, and Monte Carlo simulations. Quantum-enhanced Monte Carlo simulations, employing algorithms such as Harrow-Hassidim-Lloyd (HHL) and Variational Quantum Eigensolver (VQE), achieve computational speedups of 8-15 times compared to classical methods while maintaining high accuracy.

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This research investigates the application of fuzzy graph theory to address critical security challenges in electromagnetic radiation therapy systems. Through comprehensive theoretical analysis and experimental validation, we introduce novel approaches leveraging fuzzy cognitive maps and fuzzy graph-based architectures for access control, intrusion detection, secure communication, and risk assessment. The study demonstrates significant improvements over traditional security measures across multiple performance metrics.

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Efficient nitrogen (N) management is critical for sustaining high maize yields while minimizing environmental impacts, as conventional practices often lead to N losses, greenhouse gas emissions, and reduced eco-efficiency. To address these challenges, the "Pusa N Doctor" app was developed using dark green colour index (DGCI) for precision N management in maize. The app was further validated in experiment conducted with three N rates- 0 kg/ha (N0PK), 50 kg/ha (N0PK), and 75 kg/ha (N75PK) as basal, along with two splits of N at 35 and 45 DAS as per app (N50PK+App and N75PK+App) and GSTM (N50PK + GSTM and N75PK+GSTM).

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Intense cultivation with narrow row spacing in wheat, a common practice in the Indo-Gangetic plains of South Asia, renders the crop more susceptible to lodging during physiological maturity. This susceptibility, compounded by the use of traditional crop cultivars, has led to a substantial decline in overall crop productivity. In response to these challenges, a two-year field study on the system of wheat intensification (SWI) was conducted.

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Article Synopsis
  • The study investigates the effects of combining nano-fertilizers with conventional fertilizers on soil microbial structure and crop yield in a wheat-maize system, aiming to improve nutrient efficiency.
  • Results show that using 75% of the recommended nitrogen combined with full phosphorus and potassium via conventional methods, along with nano-urea or nano-zinc sprays, can achieve similar grain yields as the full recommended dose.
  • The application of nano-fertilizers boosted soil microbial diversity and certain beneficial microbial groups, suggesting that integrating nano and conventional fertilizers is an effective strategy for sustainable agricultural practices and enhancing soil health.
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Increasing complexity in crop nutrient requirement in intensive crop production systems needs alternate multi-nutrient sources. Polyhalite (POLY-4) which contains 14% KO along withcalcium (17% CaO), magnesium (6% MgO), and sulfur (19% S) can be a possible recourse in this regard. In maize-wheat systems, it was evaluated for productivity, profitability, nutrient usage, and nutrient use efficiency under Indo-Gangetic plain (IGP) zones for consecutive two years (2018-19 and 2019-20).

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Article Synopsis
  • Low nitrogen use efficiency (<40%) in agriculture necessitates the development of energy-efficient and environmentally friendly fertilizers, alongside better agronomic practices to enhance soil fertility and farm profitability.
  • Field experiments in semi-arid India reveal that using 75% of the recommended nitrogen with conventional fertilizers plus nano-urea reduces energy requirements by 8-11% and boosts energy efficiency by 6-9%, while also increasing crop yields by about 14%.
  • The combination of nano-urea with reduced nitrogen loads not only maintains soil health and reduces greenhouse gas emissions but also proves to be a sustainable and economically viable strategy for nutrient management in agriculture.
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Corona Virus Disease (COVID-19) caused by Severe Acute Respiratory Syndrome Coronavirus 2 (SARS-CoV-2) is a pandemic that has claimed so far over half a million human life across the globe. Researchers all over the world are exploring various molecules including phytochemicals to get a potential anti-COVID-19 drug. Certain phytochemicals present in some spices are claimed to possess antiviral, anti-bacterial, and anti-fungal properties.

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Background: Mortality after amputation is known to be extremely high and is associated with a number of patient features. We wished to calculate this mortality after first-time lower-limb amputation and investigate whether any population or treatment factors are associated with worse mortality.

Objective: To follow up individuals after lower limb amputation and ascertain the mortality rate as well as population or treatment features associated with mortality.

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One of the critical alarming constraints for agriculture is water scarcity. In the current scenario, global warming due to climate change and unpredictable rainfall, drought is going to be a master player and possess a big threat to stagnating gene pool of staple food crops. So it is necessary to understand the mechanisms that enable the plants to cope with drought stress.

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NiO nanostructures were synthesized via a simple wet chemical solution method with varying calcination temperatures. The synthesized nanostructures were characterized by XRD, TG/DSC, FT-IR and high-resolution electron microscopy techniques. The nanostructures revealed dependence of particle size, stoichiometry, optical band gap and luminescence intensity on calcination temperatures.

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Background: Mental health problems like depression, cognitive impairment, anxiety, sleep disorders, and so on, arising out of senility, neurosis, and living conditions are common in the geriatric population.

Aims: To study the psychiatric morbidity among the rural elderly.

Settings And Design: A community-based, cross-sectional study.

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A cross-sectional study was conducted on Lucknow highway in Bareilly district of Uttar Pradesh to study the knowledge of truck drivers about HIV transmission and prevention and to study the sexual behaviour of these drivers with reference to HIV/AIDS. Age, marital status, education, income, drinking alcohol, length of stay away from home, knowledge about transmission and prevention of HIV, and HIV-prone behavior of truck drivers were studied. Chi-square, mean, and SD were calculated.

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