Results 131 to 140 of about 5,311 (260)

Non-Destructive Characterization of Cultural Heritage Materials Using a Modified Acoustic Resonance Approach. [PDF]

Materials (Basel)
Pantelić F, Vasić MR, Stojanović M, Terzić A, Miljević B, Vučetić S.   +5 more
europepmc   +1 more source

Chemical Kinetics of 2‐, 4‐, and 2,4‐Seleno‐Uracils at Low Temperatures: Tautomerizations and Rotamerizations on Inert Matrices

International Journal of Chemical Kinetics, EarlyView.
ABSTRACT In the interstellar medium, chemical reactions proceed under conditions vastly different to those on Earth; these include extremely low temperatures and densities and take place in the gas phase and on water–ice grains. Understanding the energetics and more importantly the kinetics of such reactions is of relevance to the consequences on how ...
Judith Wurmel, John M. Simmie
wiley   +1 more source

Active Metamaterials with Tunable Shear Nonreciprocity and Nonlinear Dynamics. [PDF]

Adv Sci (Weinh)
Fang X, Yu M, Yu D, Cheng L.
europepmc   +1 more source

Cis–Trans Rotational Isomerism of Formic Acid, Sulfur, and Selenium Analogues and Their Dimers: Chemical Kinetics Under Interstellar Conditions

International Journal of Chemical Kinetics, EarlyView.
ABSTRACT We present chemical kinetic rate constants for the cis to trans isomerisation or rotamerization of monomeric seleno‐, thio‐, and formic acids and that of three of their dimeric species, based on variational transition state theory and multidimensional tunneling calculations in the gas‐phase, from 10 K to 300 K. These provide, firstly, reliable
Judith Wurmel, John M. Simmie
wiley   +1 more source

A novel bridge wind-induced vibration response prediction algorithm based on temporal convolution network. [PDF]

PLoS One
Qu Y, Bai X, Zhu T, Zuo S.
europepmc   +1 more source

Determination of Dynamic Characteristics for an Aerospace Structure Using Experimental and Numerical Methods

Macromolecular Symposia, EarlyView.
ABSTRACT This research provides an in‐depth investigation into the dynamic behavior of a riveted aerospace structural component, integrating both experimental testing and numerical simulations. The primary objective is to validate a Finite Element Analysis (FEA)‐based computational methodology for accurately identifying the natural frequencies and ...
Laura‐Mariana Barbu, Mihai Valentin Predoi, Aurel Alecu   +2 more
wiley   +1 more source

Experimental Study on an Inclined Cylindrical Piezoelectric Energy Harvester. [PDF]

Micromachines (Basel)
Li H, Yang C, Li W, Song R, Yang X.
europepmc   +1 more source

Detecting Loosening of Bolt‐Flanged Pipe Using Smoothed Pseudo Wigner–Ville Distribution: Digital Twin‐Based Approach Using Convolution Neural Networks

International Journal of Mechanical System Dynamics, EarlyView.
ABSTRACT In this paper, an integrated digital twin‐based fault‐diagnosis framework is proposed to detect bolt loosening in flanged pipe connections. The approach combines finite element‐based numerical modeling, experimental modal analysis, and advanced signal processing‐assisted deep learning to achieve reliable loosening detection under operational ...
Milad Shabani Yousefabad, Behzad Totakhaneh Bonab, Morteza Homayoun Sadeghi, Mir Mohammad Ettefagh, Mohammad Reza Chalak Qazani   +4 more
wiley   +1 more source

Simulation of the additional damping characteristics of underwater heave plates for mitigating long-span bridges vibration. [PDF]

Sci Rep
An W, Xu F, Wang M.
europepmc   +1 more source

Design and Multibody Dynamics Modeling of a Novel High‐Static‐Low‐Dynamic‐Stiffness Vibration Isolation Mechanism Based on Euler Buckling Characteristics

International Journal of Mechanical System Dynamics, EarlyView.
ABSTRACT Vibration isolation has long been a critical area of research, with the design of isolators based on the mechanical properties of Euler buckling beams representing one of the primary approaches. Traditionally, the focus has been on utilizing the negative stiffness characteristics of a post‐buckled Euler beam in parallel with positive stiffness
Yichang Feng, Yongpeng Gu, Gexue Ren, Suyuan Yu   +3 more
wiley   +1 more source