Analysis of the Influence of Clutch Drag Torque on the Efficiency of Hydro-mechanical Continuously Variable Transmission by Rong Chai, Mingzhu Zhang, Jianhua Wang, Fang Jia

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Improved stiff string torque and drag prediction using a computationally efficient contact algorithm by Sampath Liyanarachchi, Geoff Rideout

“…Due to the intermittent contact with the wellbore, determining torque and drag for deviated wells is difficult. Most models have ignored drill string stiffness and assumed continual contact to simplify derivation. …”
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Numerical investigation on novel group-drag-anchor systems for soft clay seabed by Yancheng Yang, Yifeng Lin, Dezhi Ning

Subjects: “…Group-drag-anchor system…”
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Scent detection dogs detect a species of hard tick, Dermacentor albipictus, with comparable accuracy and efficiency to traditional tick drag surveys by Troy Koser, Aimee Hurt, Laura Thompson, Alyson Courtemanch, Benjamin Wise, Paul Cross

“…After training, we deployed both a scent detection dog survey team and a human-only survey team on transect and surveillance plot surveys then compared the detection rates and efficiency of both methods. Results Scent detection dogs required more time and money to train on field surveys but were comparable to traditional tick drags when accounting for cost per unit area surveyed. …”
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Scale up of fermentation of recombinant Escherichia coli for efficient production of spider drag silk protein MaSp1s and its dimers by Yufan Huang, Bixia Zhou, Ziyang Chen, Yongqin Su, Cheng Cheng, Bingfang He

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AERODYNAMIC DRAG OF THE SCREW CHANNEL IN THE CYCLONE-SEPARATOR by Zlochevskiy V.L., Mukhopad K.A.

“…The main element which determines the aerodynamic drag of the entire cyclone design is a screw channel. …”
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Analytical Ballistic Trajectories with Approximately Linear Drag by Giliam J. P. de Carpentier

“…This paper introduces a practical analytical approximation of projectile trajectories in 2D and 3D roughly based on a linear drag model and explores a variety of different planning algorithms for these trajectories. …”
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Using Weather Data for Improved Analysis of Vehicle Energy Efficiency by Reno Filla

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Evaluation of Classification Possibility of Coke Breeze by Drag Force by Ji-A Lee, Bong-Min Jin, Jeong-Whan Han

“…Therefore, to increase combustion efficiency, it is necessary to reduce the ratio of coke breeze in the charged coke. …”
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ASSIMILATION OF THE TECHNOLOGY OF ROLLING-AND-DRAGGING OF STEEL TAPE FOR PISTON RINGS by A. P. Lohmatov, S. M. Zhuchkov, K. Ju. Kluchnikov, I. V. Sikachina, L. P. Barysheva

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KINEMATIC STRUCTURE AND CHARACTERISTICS OF THE “DRAG FLICK” FIELD HOCKEY TECHNIQUE by A. Antonov

“…“Drag flick” is a modern technique of pushing in field hockey, developed and implemented in the game practice in the early 90s of the last century. …”
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Drag Reduction and Efficiency Enhancement in Wide-Range Electric Submersible Centrifugal Pumps via Bio-Inspired Non-Smooth Surfaces: A Combined Numerical and Experimental Study by Tao Fu, Songbo Wei, Yang Gao, Bairu Shi

“…The optimal dimple diameter (0.9 mm, 2% of blade chord) balanced performance and manufacturability, demonstrating that bio-inspired surfaces improve ESP efficiency. This work provides practical guidelines for deploying drag reduction technologies in petroleum engineering, with a future focus on wear resistance in abrasive flows.…”
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Aerodynamic Shape Optimization of Wing–Fuselage Intersection for Minimum Interference Drag by Nuno M. B. Matos, André C. Marta

“…Interference drag in wing–fuselage intersection regions is a complex aerodynamic phenomenon where secondary flows and separation conditions might occur if not properly addressed in the aircraft design. …”
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The Study of Drag Reduction on Ships Inspired by Simplified Shark Skin Imitation by M. D. Ibrahim, S. N. A. Amran, Y. S. Yunos, M. R. A. Rahman, M. Z. Mohtar, L. K. Wong, A. Zulkharnain

“…The skin of a fast swimming shark reveals riblet structures that help reduce the shark’s skin friction drag, enhancing its efficiency and speed while moving in the water. …”
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An analytical model for quantitative evaluation of friction drag in directional sliding drilling by Zhengchao Ma, Hongbao Zhang, Hao Hu, Gensheng Li, Shouceng Tian, Ye Zhang, Tianyu Wang

“…This method enables real-time analysis of sliding drilling efficiency and quantitative estimation of friction drag, with the capability to identify friction reversal trends at formation interfaces. …”
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Experimental analysis of alternative rider postures for low drag motorcycle design by Frederick Spaven, Yuanchang Liu, Mehdi Baghdadi

“…The aerodynamic drag of a motorcycle greatly affects its energy efficiency, with the rider’s posture being a key factor in determining overall drag. …”
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Innovations in Blade Design for Enhancing Wind Turbine Efficiency: A Review of Aerodynamic, Structural, and Material Advancements by Parankush Koul

Subjects: “…wind turbine efficiency…”
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A review of drag reduction technology inspired from biomimetic surfaces and functions by Linyuan Guo, Yuan Liu, Liran Ma, Jianbin Luo

“…We hope this review will be helpful for comprehensively understanding the research status of bionic drag reduction technology and developing more efficient drag reduction methods, which are highly important for saving energy and building marine environments.…”
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Underwater Drag Reduction Applications and Fabrication of Bio-Inspired Surfaces: A Review by Zaixiang Zheng, Xin Gu, Shengnan Yang, Yue Wang, Ying Zhang, Qingzhen Han, Pan Cao

“…Future research should focus on the analysis of drag reduction mechanisms and optimization of material properties under multi-physical field coupling conditions, the development of efficient and low-cost manufacturing processes, and the enhancement of surface stability and adaptability through dynamic self-healing coatings and smart response materials. …”
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Experimental and numerical investigation of air layer drag reduction on a flat plate by Salaheldin A. Mohamad, M. Youssef, Mohamed Bennaya, Khaled Elsherbiny

“…One of the most interesting techniques to reduce ship resistance is air lubrication drag reduction (ALDR). Motivated by those facts, an experimental study was carried out in Towing Tank using a flat plate by injecting air inside its bottom surface boundary layer and investigate the efficiency of this technique at different Froude numbers. …”
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