Abstract Undetected fatigue and overload damages at the key locations of crane boom are among biggest threats in construction, leading to structural failure. Thus, health should be monitored real time ensure that it works under designed load capacity. In this study, we developed a lightweight digital twin by multifidelity surrogate (MFS) model improve real-time monitoring prediction accuracy safety boom. Digital technology, which can establish mapping between physical space space, has...

Abstract In recent years, quasi-zero-stiffness (QZS) structures have been utilized in designing galloping piezoelectric energy harvesters (GPEHs) to produce large vibration responses and high output power. However, the region is relatively narrow, leading limited enhancement of QZS-GPEH at displacement responses. To address this issue, paper proposes a flat potential-well tuning method design an improved (IQZS-GPEH) by significantly expanding QZS region. First, governing equations proposed...

Field-free molecular orientation, achieved by using two-color slow turn-on and rapid turn-off laser pulses, is theoretically investigated for linear molecules. We derive analytical results the maximum degree of field-free orientation a given number populated rotational states. show that numerical with adiabatic-turn-on sudden-turn-off pulses attain optimal orientation. Based on adiabatic theorem, effects parameters both process are analyzed. The adiabaticity well reflected through temporal...

Optimal field-free molecular orientation for a given number of populated states, achieved by using resonant laser pulses, is theoretically investigated linear molecules. An optimal phase difference between the rotational states can be obtained, at full revival times, after pulses have decayed and these conditions are analytically derived multilevel systems ($J>2$). The dependence on duration absolute area analyzed. Finally, degree obtained adjusting ratios peak amplitudes with...

A facile synthetic approach for preparing magnetic porous catalysts, from various inorganic compounds loaded by a pyrogallic acid (PG) assisted layer-by-layer (LbL) coating.

Abstract Most practical multi-objective optimization problems are often characterized by two or more expensive and conflicting objectives, which require time-consuming simulations. Commonly used algorithms construct a surrogate model of each objective function from few high-fidelity solutions. In order to further decrease the computational burden, adaptive infilling strategies for developed guide next design evaluation update as well Pareto front in an iterative manner. this paper, strategy...

Ultrasonic reflection provides a real-time way to monitor oil film thickness in running machine with non-destructive advantage. However, the influence mechanism of temperature on reference signals has not been clarified so far, which hinders precise measurement thickness. Focusing common three-layer structure sensor-adhesive-steel, global propagation model is constructed investigate variations signal temperature. Through finite element simulations, distinct mechanisms are revealed for...

An optical approach to cancel the RF self-interference using polarization multiplexed Mach-Zehnder modulators (MZMs) is presented with theoretical analysis and experimental demonstration. By dual-MZMs biased at inverted quadrature points, out of phase relationship between received interference signal reference obtained. Through adjusting delay time amplitude in domain, matching conditions for cancellation are implemented. Only one laser source utilized coherent beat noise carriers from same...

Indentations etched on the output surface of a metallic mask are proposed to produce fine lithographic patterns with resolution 500 nm using finite-difference time domain (FDTD) method. Such designed is capable enhancing near field lithography (NFL) more than three times compared structure without indentations. The simulation results show that interference disturbance between adjacent channels can be eliminated efficiently by employing As straightforward consequence, channel-to-channel...

Web behaviour analysis of a collective user has provided powerful means for studying the interests on Internet. However, existing research merely analyses single who accesses multiple applications or users access one application. The authors propose web classification model user, in which title fields HTTP flows are extracted from mirrored network traffic that been already captured any given period time. fields, considered as short abstract whole pages browsed by users, vectorized natural...

Optical properties of bowtie antennas are investigated using a numerical method finite-difference time-domain (FDTD). The optical response in the antenna feed gap is simulated as functions its geometry parameters (flare angle, arm length, apex width, thickness, dimension, well index substrate), which provide clear guideline to exploit such structures practice.

A photonic approach for RF SIC by using a compact dual-parallel Mach-Zehnder modulator is presented with the demonstration of full duplex communication. For released standard frequency band 4.9GHz 5G communication, cancellation depth 30dB over bandwidth 20MHz measured. The maximum interference to signal interest (SOI) utilized characterize capability SOI recovery and elimination result 23dB.

In this paper, we investigate the propagation characteristics of spin electromagnetic wave (SEW) in ferromagnetic film. We calculate amplitude and phase distribution along propagating direction for MSSW mode BVMSW mode. Two kinds antenna probes are considered. And simulate magnetic field around probe.

The SrLi molecule is a typical alkali-alkaline-earth-metal which of great importance in controlling chemical reactions at ultracold temperatures. vibronic absorption spectrum the from ground X2Σ+ state to excited (2)2Σ+ simulated by using full-dimensional time-dependent quantum wavepacket method with molecular rotation and vibration taken into account. By taking 84Sr6Li species as an example, thermal average effect initial rovibrational distribution on spectra has been investigated comparing...