Results 71 to 80 of about 277,634 (332)

Quantification of CO₂ Emission from Liquefied Natural Gas Truck Under Varied Traffic Condition via Portable Measurement Emission System

Energies
Liquefied natural gas (LNG) container trucks are regarded as clean energy vehicles with the potential to reduce air pollution. However, their CO2 emissions remain relatively high and are not yet well understood. In this study, the actual CO2 emissions of
Yufei Shi, Hongmei Zhao, Bowen Li, Liangying Luo, Hongdi He   +4 more
doaj   +1 more source

Unmanned Aerial Vehicle Systems for Disaster Relief: Tornado Alley [PDF]

, 2009
Unmanned aerial vehicle systems are currently in limited use for public service missions worldwide. Development of civil unmanned technology in the United States currently lags behind military unmanned technology development in part because of unresolved
DeBusk, Wesley M.
core   +1 more source

Detecting Invasive Insects with Unmanned Aerial Vehicles

, 2019
A key aspect to controlling and reducing the effects invasive insect species have on agriculture is to obtain knowledge about the migration patterns of these species.
Leskey, Tracy, Medeiros, Henry, Rice, Kevin, Stumph, Brian, Tabb, Amy, Virto, Miguel Hernandez, Wolford, Scott   +6 more
core   +1 more source

Energy Consumption Optimization in Trajectory Planning for Fuel Cell Hybrid Uavs Based On HMPC

Advanced Robotics Research, EarlyView.
The endurance limitation of multirotor drones is a critical challenge. This study adopts a hybrid power system of fuel cells and lithium‐ion batteries. Using Nondominated Sorting Genetic Algorithm II, it integrates trajectory planning with energy management optimization.
Xindi Wang, Jianyang Dong, Yongming Yao, Kaijin Hu, Jianxiong Cui, Yikai Luo, Jiawen Zhang, Shichao Niu   +7 more
wiley   +1 more source

Long‐duration fully autonomous operation of rotorcraft unmanned aerial systems for remote‐sensing data acquisition [PDF]

J. Field Robotics, 2019
Recent applications of unmanned aerial systems (UAS) to precision agriculture have shown increased ease and efficiency in data collection at precise remote locations. However, further enhancement of the field requires operation over long periods of time,
Danylo Malyuta, Christian Brommer, Daniel Hentzen, Thomas Stastny, R. Siegwart, R. Brockers   +5 more
semanticscholar   +1 more source

Collision‐Resilient Winged Drones Enabled by Tensegrity Structures

Advanced Robotics Research, EarlyView.
Based on structures of birds such as the woodpeck, this article presents the collision‐resilient aerial robot, SWIFT. SWIFT leverages tensegrity structures in the fuselage and wings which allow it to undergo large deformations in a crash, without sustaining damage. Experiments show that SWIFT can reduce impact forces by 70% over conventional structures.
Omar Aloui, Raphael Zufferey, William Stewart, Mohammad Askari, Simon Jeger, Dario Floreano   +5 more
wiley   +1 more source

A Survey of Air-to-Ground Propagation Channel Modeling for Unmanned Aerial Vehicles

, 2018
In recent years, there has been a dramatic increase in the use of unmanned aerial vehicles (UAVs), particularly for small UAVs, due to their affordable prices, ease of availability, and ease of operability.
Aboudebra A., Ahmed N., Alzenad Mohamed, Alzenad Mohamed, Al‐Hourani A., Amorim R., Amorim R., Asadpour M., Athukoralage Dasun, Azari M. M., Bandoim Lana, Blandino Steve, Bluemm Christian, Bohagen Frode, Bor‐Yaliniz R Irem, Cai X., Chandhar P., Chen J., Chen J., Cheng Chen‐Mou, Cheng Xiang, Child JR, Daniel Kai, David Blom John, Desjardins Jeff, Essaadali R., Feng Qixing, Gao Xijun, Gates B. G., George Pierce Jones IV, Goddemeier N., Goddemeier Niklas, Gulfam S. M., Gulfam S. M., Hemanth Kumar Zhiqiang Wu, Ibrahim M., Jackson B. R. P., Jamal Hosseinali, Jiang F., Johnsson J., Joo Park Pyung, Kalantari E., Kaul S., Kawamata F., Kerczewski Bob, Khawaja W., Khawaja Wahab, Khawaja Wahab, Khawaja Wahab, Kovacs I., Ksendzov Alexander, Kung H. T., Kunisch J., Kvicera Milan, Lamiano D. F., Lemos Cid E., Levis Curt, Lin X., Lyu J., Malik W. Q., Matolak D. W., Matolak D. W., Matolak D. W., Matolak D. W., Matolak D. W., Matolak D. W., Matolak D. W., Matolak David W, Matolak David W., Matolak David W., Matolak David W., Newhall W. G., Ono F., Paier A., Pavel Pechac Michal Simunek, Rappaport T. S., Ravi V. V. C., Rieth D., Romeu J., Ruddle A. R., Schneckenburger N., Sharp C. S., Shim D. H., Song Meng Yu, Sun R., Sun Ruoyu, Sun Ruoyu, Takizawa K., Tavares T., Teng E., Tu H. D., Vahidi Vahid, Walter Michael, Wentz Michael, White F., Wu Y., Yang J., Yanmaz Evşen, Yanmaz Evşen, Zelenỳ Jan, Zhang Chao, Zheng Yi   +101 more
core   +1 more source

An Empirical Air-to-Ground Channel Model Based on Passive Measurements in LTE [PDF]

, 2019
In this paper, a recently conducted measurement campaign for unmanned-aerial-vehicle (UAV) channels is introduced. The downlink signals of an in-service long-time-evolution (LTE) network which is deployed in a suburban scenario were acquired.
Ai, Bo, Cai, Xuesong, Pedersen, Gert F., Pérez Yuste, Antonio, Rodríguez-Piñeiro, José, Wang, Nanxin, Yin, Xuefeng   +6 more
core   +2 more sources

Industry Analysis: Unmanned Aerial Systems [PDF]

Muma Business Review, 2018
According to Michael Kratsios, Deputy US Technology Officer, and Executive Assistant of President, UASs will contribute to 100,000 new jobs and provide nearly $80 Billion in economic impact in the United States over the next decade, but "errant use poses unique safety and technological challenges" (Kratsios, 2018).
openaire   +1 more source

Formation Control of Multi‐Agent System with Local Interaction and Artificial Potential Field

Advanced Robotics Research, EarlyView.
This article proposes a local interaction‐based formation control method for Multi‐Agent system, integrating consensus and leader‐follower strategies with a stress response mechanism—artificial potential field to reduce communication overhead and enable obstacle avoidance. Experimental results on triangular, square, and hexagonal formations confirm its
Luoyin Zhao, Zheping Yan, Yuqing Wang, Raye Chen‐Hua Yeow   +3 more
wiley   +1 more source