Results 51 to 60 of about 411,923 (164)

AI‐enabled bumpless transfer control strategy for legged robot with hybrid energy storage system

CAAI Transactions on Intelligence Technology, EarlyView.
Abstract Designing Hybrid energy storage system (HESS) for a legged robot is significant to improve the motion performance and energy efficiency of the robot. However, switching between the driving mode and regenerative braking mode in the HESS may generate a torque bump, which has brought significant challenges to the stability of the robot locomotion.
Zhiwu Huang, Zi Yu, Hui Peng, Zixuan Wang, Xiaokang Dai, Weirong Liu, Jing Wang   +6 more
wiley   +1 more source

A Rapid Method to Quantify High-Frequency-Dominant Signals Based on Fixed-Interval Fractal Dimension

Fractal and Fractional
The fractal dimension (FD) is an effective indicator to characterize various signals in engineering. However, the FD is nearly twice that of its maximum value when examining high-frequency-dominant signals, such as those in milling chatter.
Feng Feng, Xinguo Song, Yu Zhang, Zhen Zhu, Heng Wu, Pingfa Feng   +5 more
doaj   +1 more source

Bursting Oscillation Characteristics and Improved AHODFC for DFIG and PMSG Combined Wind Farm

Energy Internet, EarlyView.
ABSTRACT Bursting oscillations occur in DFIG and PMSG combined wind farm under external disturbances and lead to the instability problems. To reveal the bursting oscillation characteristics and develop a suppression method, a fast‐slow dynamics analysis method and an improved adaptive high‐order differential feedback controller (AHODFC) based on ...
Kun Wang, Wei Chen, Jiangtao Li, Zhanhong Wei   +3 more
wiley   +1 more source

Cardiovascular Plasticity and Adaptation of High‐Altitude Birds and Mammals

Integrative Zoology, EarlyView.
This schematic depicts the cardiovascular adaptations of mammals and birds to high‐altitude hypoxia. It highlights key phenotypic changes in oxygen transport and cardiac responses, driven by molecular mechanisms including transcriptional regulation and genetic modifications.
Huishang She, Yanhua Qu
wiley   +1 more source

Design of eddy current dampers for vibration suppression in robotic milling

Advances in Mechanical Engineering, 2018
The milling robot normally has a low stiffness which may easily cause chatter during machining. This article presents a novel eddy current damper design for chatter suppression in the robotic milling process.
Fan Chen, Huan Zhao
doaj   +1 more source

Self-Excited Vibrations Counteraction in Machine Tool — Cutting Process System Using Controllable Eliminator of Vibration

Engineering Transactions, 2006
In the paper, the results of simulation investigations on the application of a semi-active vibration eliminator for suppression of machining chatter are presented.
Marcin Chodźko, Krzysztof Marchelek, Arkadiusz Parus   +2 more
doaj   +1 more source

Comparative Genomics and Functional Evidence for Convergent Adaptation to Hypoxia in Mammals

Integrative Zoology, EarlyView.
This study reveals convergent selection in mammals adapted to hypoxia. Functional assays demonstrate that amino acid mutations reduce oxidative stress, attenuate hypoxia‐induced injury, and modulate the hypoxia‐inducible transcription factor (HIF)‐driven hypoxic response.
Hao Dong, Chunxu Wang, Enqing Pei, Liang Zhao, Simin Chai, Ran Tian   +5 more
wiley   +1 more source

Gut Microbiota Analysis and Comparison in Forest Musk Deer (Moschus berezovskii) of Different Ages and Musk‐Secreting Periods

Integrative Zoology, EarlyView.
Metagenomic sequencing was used to analyze fecal microbiota of captive male forest musk deer (FMD) from the Sichuan Institute of Musk Deer Breeding across ages and musk‐secreting periods. Gut microbiota was generally stable and dominated by Firmicutes, while age and musk secretion shaped microbial composition and function, with musk collection linked ...
Jiuyan Jiang, Qiuping Huang, Fei Wu, Pingwei Liang, Linping Fan, Xia Zhou, Chengli Zheng, Xin Shi, Huina Song, Ji Wang, Jing Xue Luo, Ji Chen, Qinlin Yang, Siqi Peng, Lingqian Yin, Dejun Zeng, Hang Jie, Guangxiang Zhu   +17 more
wiley   +1 more source

The Company We Keep: Effects of Different Social Environments on Male Guinea Pig Behaviour and Hormones Over the Course of the Ontogeny

Ethology, EarlyView.
To examine how their behaviour and hormones change over different life phases, male guinea pigs experienced two different social environments from juvenility to adulthood. Only one environment contained social stimulation by unfamiliar conspecifics. Although no differences in testosterone and cortisol concentrations were found, it was interesting that ...
Maximilian Baldy, Sylvia Kaiser
wiley   +1 more source

Influence of Damping Interface Materials on Vibroacoustic Behavior and Surface Quality in Hard Turning Operations [PDF]

JES: Journal of Engineering Sciences
This study examines whether damping interface materials can reduce vibrations and improve surface finish during hard machining. Experiments were run using standard steel tooling alongside four alternative interface materials: epoxy granite composite ...
Walid Shewakh, Majed Moosa
doaj   +1 more source