We show that spin-2 geometric excitations, known as graviton modes, generally exhibit vanishing lifetimes in lattice Chern bands, including moir\'e systems. In contrast to the Landau levels, we first numerically demonstrate prominent peaks spectral functions diminish rapidly with increasing system sizes. explore how choice of interaction affects strength these peaks, short-ranged interactions pushing mode far into continuum where it can be significantly scattered due increased density...

Cold reinforcement techniques refer to methods that produce no or only low tensile residual stresses in structural details, avoiding new fatigue vulnerable details. To ensure the safety and extend life of steel bridges, cold are proposed stop cracking critical details orthotropic decks (OSDs) web gap zones. were evaluated by testing laboratory, situ bridge case studies, numerical fracture mechanics analysis using extended FEM. Compared with drilling stop-holes, bonding plates bolting angles...

Gearboxes are one of the essential components in railway vehicle, and their fault diagnosis is critical to safe operation. Traditional deep learning difficult accurately identify gear's health status under variable conditions small sample size. To tackle this problem, we propose an ensemble decision approach that combines dislocated time–frequency representation a pre-trained convolutional neural network (CNN) evaluate status. The experimental results indicate continuous wavelet transform...

In this paper we consider a scheme for probabilistic remote state preparation of general qubit by using W states. The consists the sender, Alice and two receivers Bob Carol. performs projective measurement on her in basis spanned she wants to prepare its orthocomplement. This allows either or Carol reconstruct with finite success probability. It is shown that some special ensembles qubits, requires only classical bits, unlike case quantum teleportation where three bits are needed.

In the pioneer CAE stage, life assessment is essential part to make product meet requirement. Commonly, lives of flexible structures are determined by vibration fatigue which accrues at or close their natural frequencies. However, existing PSD damage estimation methods have two prerequisites for use: behavior mechanical system must be linear and probability density function response stresses follow a Gaussian distribution. Under operating conditions, non-Gaussian signals often recorded as...

Fatigue experiments are very important for the study of structural fatigue damage. As we all know, usually consume a lot resources and time, slowing down research progress. The Locati method, which is applied to frequency domain analysis method random vibration fatigue, replaces traditional up-down accelerates progress experiment. This can effectively improve efficiency reduce test time piece consumption under premise ensuring accuracy. It based on material S-N curve, after one step-load...

At present, the linear fatigue accumulation theory proposed by Miner is used to calculate problem of random vibration. In this process, loading order loads ignored, so that results obtained are riskier. The nonlinear cumulative damage takes into account effects load sequence, but calculation becomes more complicated. Many scholars have shown alternating not strictly linear, and high low will affect index. This phenomenon be obvious in vibration process. paper, sequence on non-Gaussian...

Currently, braking control systems used in regional railways are open-loop systems, such as metro and tramways. Given that the performance of can be influenced by issues wheel sliding or properties friction components present brake our study puts forward a novel closed-loop mechanism to autonomously stabilize performance. It is able keep train deceleration close target values required unit (BCU), especially terms electrical-pneumatic transform process. This method fully considers efficiency...

In this paper, we prove the global existence of classical solutions to Cauchy problem for minimal surface equation in Minkowski space R1+2 with slow decay initial value.

In this paper, we study the well-posedness of initial value problem for fourth order nonlinear Schrödinger equation.By exploiting Strichartz estimates, Kato s smoothing effect and maximal function estimates linear operator, establish local global in homogeneous nonhomogeneous Besov spaces.Moreover, scattering result small data is also obtained.

ABSTRACT The brake control box beneath an EMU is exposed to dynamic and fluctuating load cases, increasing its susceptibility vibration fatigue failure. A novel lightweight design approach was implemented integrate structural material optimizations. Static tests of the T700/5429 CFRP were carried out augment stress analysis predictions life. local stresses perpendicular parallel welds obtained calculate ratio, range, allowable value corresponding component. strength aluminum estimated on...

In this paper, we investigate the initial boundary value problem for linearized double dispersion equation on half space $\mathbb{R}^{n}_{+}$. We convert into by odd reflection. The asymptotic profile of solutions to is derived establishing problem. More precisely, associated with convolution partial derivative fundamental heat and free wave equation.

Fatigue damage is the most dangerous failure behavior for gearbox suspenders in urban railway vehicles, and passenger capacity crucial to dynamic load characteristics of traction transmission system. Therefore, this paper, a model motor car established, numerical simulation carried out under different speeds curve radii investigate effect on fatigue life. The research results show that an essential factor affecting life suspenders. As vehicle runs at average speed, suspender 1.07 × 106 km...

In this paper,seven parameters were selected as judgement indexes. The model of improved fuzzy neural network and single factor veto has been established that was applied to online boiler combustion stability. function can realize judgments when anyone those factors determine the stability combustion, so is more rational. Through learning system, samples module selected, trained verified successfully.

In order to improve the work efficiency and single function of hedge trimming machine, this subject innovatively designs a vehicle-mounted double-arm machine. It can trim top one side green belt at same time. Real-time adjustment angle width also highway slope. Using SOLIDWORKS establish whole machine model ADAMS carry out simulation analysis on model. The height cutting tool off ground, horizontal displacement load each hydraulic cylinder in process movement are calculated. rationality...