Strain-hardening cementitious composites (SHCC) have been widely studied due to their high toughness and durability. The cement content increases a huge burden on the cost CO2 emissions of SHCC. To reduce environmental impacts SHCC, this study first develops low-carbon lightweight SHCC by using high-volume recycled concrete powder (RCP) as supplementary materials cenosphere waste aggregate. influence RCP (0%, 15%, 30%, 45% mass) hydration mechanism, mechanical properties, sustainability was...

Grinding chatter is a self-induced vibration which unfavorable to precision machining processes. This paper proposes forecasting method for grinding state identification based on bivarition empirical mode decomposition (BEMD) and least squares support vector machine (LSSVM), allows the monitoring of over time. BEMD promising technique in signal processing research involves two-dimensional signals into series intrinsic functions (BIMFs). extraction criterion its true BIMFs are investigated by...

The elevator door system plays a crucial role in ensuring safety. Fault prediction is an invaluable tool for accident prevention. By analyzing the sound signals generated during operation, such as component wear and tear, fault of can be accurately determined. This study proposes GNN-LSTM-BDANN deep learning model to account variations operating environments signal acquisition methods. proposed utilizes historical data from other elevators predict remaining useful life (RUL) target system....

ABSTRACT To investigate the patterns of rock crack initiation caused by nonuniformly distributed heat flux resulting from fracture air‐vapor pressure, pressure control equation was deduced, and five spatial distribution forms were established. The criterion considering nonuniform conditions proposed based on modified maximum tangential stress criterion, theory validated using FEM FE‐FEM numerical methods. results show that peak value determines surface temperature, form range...

Inequalities in oral health and nutrition present substantial challenges for vulnerable older adults. Although poor is known to increase the risk of inadequate dietary quality compromised nutritional status, limited evidence exists on this relationship among socioeconomically disadvantaged adults rural areas—a particularly population. This study investigates association between health, status China. A cross-sectional was conducted 310 aged 60 or above Shaanxi province, northwest Oral...

The locking mechanism is crucial for the reliable connection and disconnection of electrical connectors. Aiming at lack theoretical support reliability evaluation in long-term storage, a comprehensive multi-theory modeling method proposed to solve unlocking failure related performance-evaluation problems. An analysis reveals that metal-crystal dislocation glide, causing pull-rod deformation spring stress relaxation, main cause failure. Based on Hertz’s contact theory, locking-state...

A novel PCL-<italic>b</italic>-PnBA-<italic>b</italic>-PMMA was designed and applied to construct ordered nanostructures within epoxy thermosets.

All‐solid‐state lithium batteries (ASSLBs) are promising due to their high‐energy output and low‐risk profile, but development has only just begun. Atomic force microscopy (AFM) related techniques have had an impact on ASSLBs research by elucidating the interfacial, morphological, mechanical, electrical, electrochemical properties of a wide range electrodes electrolytes. However, because cross‐section cut is necessary define solid–solid interface, true in situ analysis not practical. The...

Studies on maintenance and inventory optimization have been frequently combined to cut the total operation costs of multicomponent systems. Most existing studies assume that components are stochastically independent only collaborate management-related resources. In practice, stochastic dependencies exist in most complex systems, limited time becomes a crucial resource shared by all during multimission selective (SM). Neglecting these features reduces practicality policies. To address this...

The rapid expansion of wind farms has accelerated research into improving the reliability turbines to reduce operational and maintenance costs. A critical component in turbine drive-trains is gearbox, which prone different types failures due long-term operation under tough environments, variable speeds alternating loads. To detect gearbox fault early, a method proposed for an effective diagnosis by using improved ensemble empirical mode decomposition (EEMD) Hilbert square demodulation (HSD)....

A vibration-based approach to detect crack damage for large structural systems by using the Hilbert—Huang transform (HHT) has been proposed. The proposed method numerically implemented on a composite wingbox. In implementation process, following steps have identified as being important: (a) An optimization procedure is developed genetic algorithm (GA) in order determine location of piezoelectric sensor detection wingbox; (b) To solve end effect problem empirical mode decomposition (EMD),...

Accelerated life test (ALT) is currently the main method of assessing product reliability rapidly, and design efficient plans a critical step to ensure that ALTs can assess accurately, quickly, economically. With promotion national strategy civil-military integration, ALT will be widely used in research development (R&D) various types products, plan theory face further challenges. To aid engineers selecting appropriate theories stimulate researchers develop required engineering, with focus...

An experimental campaign was undertaken to characterize the mechanical properties of newly proposed aluminum alloy ribs (ARs)-anchored glass fiber–reinforced polymer (GFRP) bars via tensile, short beam shear and pullout tests. The investigated variables consisted bar surface treatments (smooth, shallow-ribbed, deep-ribbed) anchorage design parameters (radial extrusion initial wall thickness). results derived from tensile test showed that strength ARs-anchored GFRP could be designed optimized...