The DSpace digital repository system captures, stores, indexes, preserves, and distributes digital research material. http://https://dspace.iiti.ac.in:80 2026-07-20T18:37:33Z 2026-07-20T18:37:33Z Choudhary, Pushpa https://dspace.iiti.ac.in:8080/jspui/handle/123456789/18813 2026-07-20T17:05:49Z 2026-01-01T00:00:00Z

Title: Examining risky riding behaviours among food delivery riders: A systematic literature review Authors: Choudhary, Pushpa Abstract: Online food delivery services have become highly popular in recent years, leading to concerns about Food Delivery Riders' (FDRs) safety, health, and welfare. Human factors are found as the primary contributing factor in approximately 94% of riders' crashes. Therefore, the aim of the present study is to conduct a comprehensive systematic review of the literature on risky riding behaviour of FDRs, with a focus on understanding the prevalence of various risky riding behaviours and their influencing factors. Studies were searched in seven databases, and after systematic screening, 57 articles were included in the final review. Findings indicate that most of these studies are geographically concentrated in Asian countries and have utilized questionnaire surveys. The following risky behaviours are consistently observed among FDRs: Violations and Errors . In particular, speeding, wrong-way riding, red-light violation, mobile phone use, tailgating, etc., are found to be dominant behaviours. Subsequently, various factors affecting risky behaviours of FDRs are examined, including (a) sociodemographic factors, (b) work-related factors, (c) attitudinal, cognitive, and psychological factors, and (d) environmental, infrastructural, and other contextual factors. Sociodemographic factors and work-related factors, including age, gender, income, job demands, job resources, service experience, daily working hours, etc., are found to have a significant impact on risky behaviours of FDRs. Importantly, this study serves as a valuable resource for researchers, highlighting existing research gaps and offering recommendations for future research to reduce risky riding behaviours among FDRs. Additionally, the findings provide actionable insights to transportation professionals toward improving the safety of FDRs. © 2026 Elsevier Ltd.

2026-01-01T00:00:00Z Trivedi, Madhu singh, Natvar Solanki, Ravindra Bakshi, Kaustav https://dspace.iiti.ac.in:8080/jspui/handle/123456789/18814 2026-07-20T17:05:49Z 2026-01-01T00:00:00Z

Title: Relative performances of skewed hyperbolic paraboloidal stiffened shells – A geometrically non-linear approach Authors: Trivedi, Madhu; singh, Natvar; Solanki, Ravindra; Bakshi, Kaustav Abstract: Laminated composites are lucrative construction materials for civil engineers. The material is lightweight, resistant to atmospheric decay and possesses high strength/stiffness to weight ratio. The doubly curved hyperbolic-paraboloidal shells are stiff and architecturally pleasing. Naturally, these shells made of laminated composites are popular choices among the practicing civil engineers to cover long column free spans. The skewed forms can satisfy the architectural requirements of industrial applications. But these are susceptible to instability which can be addressed by stiffeners. The research on hyperbolic paraboloids is ample in numbers but the same for panels with cut-outs are scanty. The literature shows that there are no research reports available on skewed stiffened hyperbolic-paraboloidal curved panels with cut-outs, especially using the geometrically non-linear approach. Therefore, an attempt has been made in this paper to study the bending and free vibration of simple supported skewed panels for different skew angles, laminations, cut-outs and stiffener orientations which can provide meaningful design guidelines to practicing civil engineers. © 2026 selection and editorial matter, N V R Naidu, K R V Subramanian, Nagaraju Kottam and G N Anil Kumar, individual chapters, the contributors.

2026-01-01T00:00:00Z Upkare, Piyush Pradip Chorma, Sumit Dadhich, Ramanand Singh, Indrasen https://dspace.iiti.ac.in:8080/jspui/handle/123456789/18815 2026-07-20T17:05:49Z 2026-01-01T00:00:00Z

Title: Analysis of Ramming Process for 155 mm×52 Caliber Gun Barrel System Authors: Upkare, Piyush Pradip; Chorma, Sumit; Dadhich, Ramanand; Singh, Indrasen Abstract: The interaction between rotating band and barrel during the ramming and engraving process influences the performance of gun. Several studies for the latter process have been reported, while studies for the former are limited to a few gun systems, including 152 mm mod 77, 125 mm T-72 tank, 125 mm 2A46 tank, and have not undertaken for 155 mm×52 caliber gun. Therefore, finite element simulations of ramming process have been performed for new and worn-out barrel of 155 mm×52 caliber gun system. The effect of leading angle of band on the contact force is also studied. Results show that ramming velocity Vr of 5 m/s generates enough contact force to avoid the fallback of projectile for maximum angle of barrel-elevation. Also, contact force drops gradually as barrel wear increases till 0.5 %, but drops rapidly for further enhancement in barrel wear. The minimum Vr ensuring no fallback in a worn barrel increases marginally up to 1 % barrel-wear, but it increases exponentially for further rise in barrel wear. Further, the driving band with a leading angle of 3° is found to produce maximum contact pressure. The results obtained from this study would help in understanding the ramming process better for the 155mm × 52 mm Caliber gun. © 2026, DESIDOC.

2026-01-01T00:00:00Z Kushwaha, Ajay Kumar https://dspace.iiti.ac.in:8080/jspui/handle/123456789/18816 2026-07-20T17:05:49Z 2026-01-01T00:00:00Z

Title: Nanoarchitectonics for sustainable supercapacitor electrodes via the upcycling of waste cardboard into graphitic porous carbon Authors: Kushwaha, Ajay Kumar Abstract: In this work, highly porous activated carbon was synthesized from waste cardboard through a single-step pyrolytic route at 600, 700, and 800 °C, and systematically evaluated as an electrode material for aqueous supercapacitors. Structural analysis confirmed the coexistence of graphitic domains and residual CaCO3, with progressive carbon ordering and CaCO3 decomposition at higher temperatures. FESEM and BET measurements revealed a transition from fibrous structures to fragmented, pore-rich carbon, accompanied by a substantial rise in specific surface area at 800 °C. XPS confirmed rich oxygenated functionalities, supporting improved wettability and charge-storage behaviour. Electrochemical studies in a three-electrode configuration demonstrated superior capacitive performance for the 800 °C sample, delivering 688.1 F g−1 at 5 mV s−1 and stable cycling over 5000 cycles. A symmetric two-electrode device further achieved 163.4 F g−1, retained 92.5% capacitance after 1000 cycles and delivered a maximum energy density of approximately 13.6 Wh kg−1 at a power density of 710 W kg−1. Practical demonstrations, including LED illumination and powering a watch, validate its application potential. These findings establish waste cardboard-derived carbon as a sustainable and efficient electrode material for high-performance energy-storage devices. © 2026 Elsevier Masson SAS. All rights are reserved, including those for text and data mining, AI training, and similar technologies.

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