Results 71 to 80 of about 24,472 (266)
Structure and evolution of central stars of Planetary Nebulae [PDF]
Symposium - International Astronomical Union, 1997 In this review a critical examination of our present knowledge about the structure and evolution of central stars of planetary nebulae is presented. In particular, the still enigmatic origin of the Wolf-Rayet central stars is addressed, too. Some directions for future work are given at the end.
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Advanced Robotics Research, EarlyView.This review identifies key design considerations for insect‐inspired microrobots capable of multimodal locomotion. To draw inspiration, biological and robotic strategies for moving in air, on water surfaces, and underwater are examined, along with approaches for crossing the air–water interface.
Mija Jovchevska +2 more
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Autonomous Locomotion of Tensegrity Structure on Low‐Temperature Surfaces
Advanced Robotics Research, EarlyView.A low‐temperature responsive tensegrity structure (LRTS) is constructed by integrating low‐responsive temperature liquid crystal elastomer (LCE) cables, nonresponsive cables, and stiff rods. The low phase transition temperature of LCE is achieved by introducing a new liquid crystal mesogen.
Changyue Liu +5 more
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Design of New Ravigneaux Planetary Gearset Automatic Transmissions for Automobile
Jixie chuandong, 2018 A group of long pinion-to-short pinion planetary gears are added into the traditional Ravigneaux planetary gearset and one planetary gear meshes with two others.
Zhang Jian, Xue Huanzhang
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Evolution of Steam Worlds: Energetic Aspects
The Astrophysical JournalSub-Neptunes occupy an intriguing region of planetary mass–radius space, where theoretical models of interior structure predict that they could be water-rich, where water is in steam and supercritical state.
Artyom Aguichine +5 more
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Modeling, Testing, and Characteristic Analysis of a Planetary Flywheel Inerter
Shock and Vibration, 2018 We propose the planetary flywheel inerter, which is a new type of ball screw inerter. A planetary flywheel consists of several planetary gears mounted on a flywheel bracket. When the flywheel bracket is driven by a screw and rotating, each planetary gear
Zheng Ge, Weirui Wang
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Waveguide Photoactuators: Materials, Fabrication, and Applications
Advanced Robotics Research, EarlyView.Waveguide photoactuators convert guided light into mechanical motion. Their tethered‐flexible design enables minimally invasive surgery and confined‐space robotics. This review aims to guide materials selection, device design, and system integration, accelerating the transition of waveguide photoactuators from laboratory prototypes to versatile ...
Minjie Xi +4 more
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Fault Analysis and Structural Improvement Design of Planetary Gear in Wind Turbine Gearbox
Jixie chuandong, 2019 Focusing on planetary gear fault of traditional NGW type wind turbine gearbox， the fault analysis in the process of using is carried out， finding out why the planetary gear is damaged and an improved design of transmission structure for wind turbine ...
Yonghong Li
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AerospaceIn order to explore the influence of wheel surface structure on the trafficability of planetary rovers on soft ground, three kinds of wheels with different rigid wheel surface structures were selected for research. The basic performance parameters of the
Xinju Dong +6 more
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STRUCTURE AND DYNAMICS OF PLANETARY MAGNETOSPHERES
, 2022 The interactions between the ambient plasmas and the objects of the Solar System result in variable exchanges both in time and space of mass, momentum and energy within different types of magnetospheres. The characterization of the sources, the general circulation and the losses of the magnetospheric plasmas as well as the identification of the ...
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