Results 21 to 30 of about 8,095 (184)

Environment variables affect CPUE and spatial distribution of fishing grounds on the light falling gear fishery in the northwest Indian Ocean at different time scales

Frontiers in Marine Science, 2022
To better develop and protect the pelagic fishery in the northwest Indian Ocean, China’s fishing enterprises have been producing pelagic fisheries in the said area for a long time.
Haibin Han, Haibin Han, Chao Yang, Chao Yang, Heng Zhang, Heng Zhang, Zhou Fang, Zhou Fang, Bohui Jiang, Bohui Jiang, Bing Su, Jianghua Sui, Yunzhi Yan, Delong Xiang, Delong Xiang   +14 more
doaj   +1 more source

Design of an Adaptive Landing Gear with Ground Contact Sensing Capability

Nanjing Hangkong Hangtian Daxue Xuebao
To improve the landing capability of helicopters on complex terrain， this paper proposes an adaptive landing gear with ground contact sensing capability.
LI Qi, MIAO Hongtao, YANG Yun
doaj   +1 more source

Selection Methodology of an Electric Actuator for Nose Landing Gear of a Light Weight Aircraft

Applied Sciences, 2020
Landing gear system of an aircraft enables it to take off and land with safety and comfort. Because of the horizontal and vertical velocity of aircraft, upon landing, the complete aircraft undergoes different forcing functions in the form of the impact ...
Taimur Ali Shams, Syed Irtiza Ali Shah, Muhammad Ayaz Ahmad, Kashif Mehmood, Waseem Ahmad, Syed Tauqeer ul Islam Rizvi   +5 more
doaj   +1 more source

Using Fishermen’s Knowledge and GIS to Identify Fishing Grounds, Gears and Species in the Projected Marine Protected Area ‘Jabal Moussa’

Journal of Sustainability and Environmental Management, 2022
Marine spatial planning and ecosystem based management such as MPA’s has been used as tools to manage human activities, to conserve coastal ecosystems and biodiversity for the sustainable use of oceans, seas and marine resources. In this study, we focused on establishing a spatial distribution of the fishing grounds used by local fishermen in the ...
Mohamed Rida Derdabi, Mustapha Aksissou, Ihssane Toujgani   +2 more
openaire   +1 more source

A Rational Numerical Method for Simulation of Drop-Impact Dynamics of Oleo-Pneumatic Landing Gear

Applied Sciences, 2021
Oleo-pneumatic landing gear is a complex mechanical system conceived to efficiently absorb and dissipate an aircraft’s kinetic energy at touchdown, thus reducing the impact load and acceleration transmitted to the airframe.
Rosario Pecora
doaj   +1 more source

Adaptive Nonlinear Dynamic Inversion with Ground Taxiing Dynamics for Trajectory Tracking and Safe Autonomous Take-Off/Landing of Fixed-Wing UAVs

Drones
The design of control systems for aircraft autonomous takeoff and landing, as well as full-flight-envelope operations—including taxiing, takeoff, climb, cruise, descent, and landing—presents significant challenges.
Yingdong Xia, Mingying Huo, Xiyan Zhao, Lehan Wang, Jianfeng Wang, Yuxuan Yao, Guiqi Pan, Cheng Wang, Ze Yu   +8 more
doaj   +1 more source

Study of Brake Disc Friction Characteristics Effect on Low Frequency Brake Induced Vibration of Aircraft Landing Gear

Aerospace, 2022
During aircraft braking, the change of ground adhesion forces can cause forward and backward vibration of the landing gear, and the performance of the brake disc may exacerbate this vibration.
Songyang Zhang, Qiaozhi Yin, Xiaohui Wei, Jiayi Song, Hong Nie   +4 more
doaj   +1 more source

Quantitative Analysis of the Swimming Movements of Flatfish Reacting to the Ground Gear of Bottom Trawls [PDF]

Fisheries and aquatic sciences, 2006
Two typical responses have been documented for flatfish when they encounter the ground gear of bottom trawls: herding response and falling back response. These two responses were analyzed from video recordings of fish and were characterized by time sequences for four parameters: swimming speed, angular velocity, acceleration, and distance between the ...
Yong-Hae Kim, Clem S. Wardle
openaire   +1 more source

Effects of Gear Modifications on the Trawl Performance and Catching Efficiency of the West Coast Upper Continental Slope Groundfish Survey Trawl [PDF]

, 1998
Since 1984, annual bottom trawl surveys of the west coast (California–Washington) upper continental slope (WCUCS) have provided information on the abundance, distribution, and biological characteristics of groundfish resources. Slope species of the deep-
Lauth, Robert R., McEntire , Scott W., Syrjala, Stephen E.   +2 more
core  

Estimating seabed pressure from demersal trawls, seines, and dredges based on gear design and dimensions [PDF]

, 2015
This study assesses the seabed pressure of towed fishing gears and models the physical impact (area and depth of seabed penetration) from trip-based information of vessel size, gear type, and catch. Traditionally fishing pressures are calculated top-down
Bastardie, Francois, Breen, Mike, Dinesen, Grete E., Eigaard, Ole Ritzau, Hintzen, Niels T., Lafargue, Pascal, Mortensen, Lars Olof, Nielsen, J. Rasmus, Nilson, Hans C., O'Neil, Finbarr G., Polet, Hans, Reid, David G., Rijnsdorp, Adriaan D., Sala, Antonello, Sköld, Mattias, Smith, Chris, Sørensen, Thomas Kirk, Tully, Oliver, Zenging, Mustafa   +18 more
core   +2 more sources