Results 81 to 90 of about 26,480,397 (286)

Operational Modal Analysis of a Helicopter UAV from Flight Tests

, 2011
The Operational Modal Analysis (OMA) could be used for the identification of the dynamics of aerospace vehicles, in terms of natural frequencies, damping ratios and mode shapes, during flight tests, using only the output responses due to the aerodynamic ...
GRAPPASONNI C, AGNENI A., COPPOTELLI, Giuliano   +2 more
core  

Analysis on Modal Distribution and Modal Density-Based Crossover Frequency in Cabin-Sized Enclosures

Archives of Acoustics
In the sound field simulation of cabin-sized enclosures, the Schroeder frequency (SF) is still employed to estimate the crossover frequency (CF) that determines the validity ranges of wave-based and geometrical acoustic methods.
Ziyu Wang, Liangfen Du, Guangzheng Yu
doaj   +1 more source

Structural and biochemical analysis of a B12 superbinder

FEBS Letters, EarlyView.
BtuG proteins are vitamin B12 scavengers in Bacteroides thetaiotaomicron, a dominant human gut bacterium. We present crystal structures of three BtuG homologs bound to cobalamin and its precursor cobinamide, revealing picomolar binding affinities, among the highest known for any natural protein.
Jose M. Martinez Felices, Jacob J. Whittaker, Dirk J. Slotboom, Albert Guskov   +3 more
wiley   +1 more source

Vibration Modal Analysis of a New Type of Automobile Transmission Housing

Jixie chuandong, 2016
Based on the transmission housing which is designed independently by Automotive Engineering Technology Research Institute of Hefei University of Technology,the three- dimensional modeling of the housing is built by using Pro / E software,then imported in
Tao Xiaomin, Wang Shaojie
doaj  

Review of Structural Modal Tracking in Operational Modal Analysis: Methods and Applications

Applied Sciences
Modal tracking has evolved into a crucial research domain over the past decades. It synergizes with automatic modal parameter estimation (AMPE) to achieve automatic operational modal analysis (AOMA).
Shenghui Fu, Jie Wu
doaj   +1 more source

Modal Expansion Analysis of T-Shaped Waveguide

IEEE Access, 2019
The T-shaped waveguide (T-waveguide for short) is a new kind of wideband waveguide which is easier to fabricate than conventional wideband waveguides. This paper presents the modal expansion analysis of the T-waveguide.
Huapeng Zhao, Kangning Li, Mingzhou Zhan
doaj   +1 more source

Structures of mycobacterial 3‐methylcrotonyl‐CoA carboxylase reveal carrier‐domain translocation between catalytic sites

FEBS Letters, EarlyView.
Mycobacterial 3‐methylcrotonyl‐CoA carboxylase uses a mobile biotin‐carrying domain to shuttle a carboxyl group between two catalytic sites, enabling carboxylation of 3‐methylcrotonyl‐CoA during leucine breakdown. Cryo‐electron microscopy captures the carrier at both sites and reveals an inward loop movement that may prevent futile rebinding to the ...
Ajit Yadav, Bogdan I. Florea, Sebastian Geibel   +2 more
wiley   +1 more source

Identification of changes in the dynamics of a reinforced concrete building through a machine learning approach for data normalization

, 2022
In recent years there has been a growing number of Structural Health Monitoring (SHM) applications based on environmental vibration measurements and Operational Modal Analysis techniques.
Nicoletti V., Quarchioni S., Carbonari S., Arezzo D., Gara F.   +4 more
core  

Modal Analysis of Gearbox based on the Method of ERA

Jixie chuandong, 2015
Based on the method of ERA,a system of modal analysis is built,the model of HW25505 TCL gearbox is set up under the Coinv DASP MAS modal analysis module.The relating modal datum are obtained by hammering test of single-input multi- output analysis method,
Zhang Lin, Ma Weijin, Huang Bincheng, Ge Yumin, Wen Fang   +4 more
doaj  

From junk to function — How weak selection in eukaryotes builds new parts and drives genomic complexity

FEBS Letters, EarlyView.
How do genomes gain new functional parts? In eukaryotes, which tend to evolve under weak selection, much of the genome is junk. Palazzo and Qiu borrow the logic of Markov chains to show how non‐functional DNA becomes functional through the appearance of intermediate states, which arise due to epistasis, buffering, and biochemical messiness, allowing ...
Alexander F. Palazzo, Yi Qiu
wiley   +1 more source