Facing the increasing complexity and dynamic fluctuations of global agricultural trade market, accurate forecasting plays a key role in supporting policy formulation, stabilising market optimising resource allocation. In order to increase precision stability predictions, this research suggests hybrid model built on temporal convolution network (TCN) lightweight gradient boosting tree (LightGBM). The TCN module effectively captures long-term dependence characteristics time series data through...

The titanium carbide particles reinforced iron matrix composites (TiC/Fe MCs) with different TiC contents of 25, 33, and 41 wt% were fabricated using spark plasma sintering (SPS). effect content on the microstructure mechanical properties TiC/Fe MCs was studied. results obtained from scanning electron microscopy (SEM), Vickers hardness testing, universal testing machine. porosity increases an increase in content. At 25%, composite exhibits minimum 3.85% demonstrates excellent overall...

Uniaxial, torsion, and axial-torsion fatigue experiments were conducted on a pressure vessel steel, 16MnR, in ambient air. The uniaxial using solid cylindrical specimens. Axial-torsion employed thin-walled tubular specimens subjected to proportional nonproportional loading. true fracture stress strain obtained by testing shafts under monotonic torsion. Experimental results reveal that the material investigation does not display significant hardening. was found shear cracking pure loading but...

Uniaxial, torsion, and axial-torsion fatigue experiments were conducted on a pressure vessel steel, 16MnR, at room temperature. The uniaxial using solid cylindrical specimens. Axial-torsion employed thin-walled tubular specimens subjected to proportional nonproportional loading. A critical plane multiaxial criterion recently developed was found correlate well with all the for material. In addition, correctly predicted cracking behavior of material different loading paths.

An experimental investigation was conducted on the crack growth behavior of a pressure vessel steel, 16MnR, in ambient air. Standard compact tension specimens were subjected to Mode I loading with several R-ratios and amplitudes. Three circular notch sizes ranging from very sharp blunt used. In addition constant amplitude loading, experiments study influences overload sequence growth. The results show that R-ratio has an insignificant influence material. size together great early notch. A...

Thermal energy storage (TES) sandwich-structures that combine the heat function with structural functionality are described. The structure consists of a thermal interface (TI) connected to hollow plate lamination. Each laminate is aluminum having series mm-scale channels or compartments filled phase change material (PCM). Heat via latent PCM. A generalized response model applicable wide range channel geometrical configurations couples TI plate/PCM-volume. temporal system easily obtained...

Mechanical characterization of a two-dimensional Thermal Energy Storage (TES) composite structure that combines the heat storage capability with structural functionality was carried out experimentally. Static and fatigue experiments were conducted for under three-point bending at both room temperature elevated temperature. An energy method model developed to predict mechanical behavior composite. Nomenclature E Young's modulus M Bending moment P External load applied e Strain es Surface...

With the gradual expansion of application field autonomous intelligent robots, their working environment will also be complex and diverse. The perception system robot is responsible for obtaining internal state external information robot, which basis decision-making planning. By installing a variety sensors on using fusion method to fuse obtained information, consistent description obtained. key architecture robots seek best compromise between precise reasoning fast response. development...

Thermal Energy Storage (TES) sandwich-structures that combine the heat storage function with structural functionality are described. The structure consists of a Interface (TI) connected to hollow plate lamination. Each laminate is aluminum having series mm-scale channels or compartments filled Phase Change Material (PCM). Heat via latent PCM. A generalized thermal response model applicable wide range channel geometrical configurations couples TI aluminum/PCM It gives rise closed-form...

Feature extraction is significant for pattern analysis and classification. Those based on genetic algorithms are promising owing to their potential parallelizability possible applications in large scale high dimensional data Most recently, Zhao et al. presented a direct evolutionary feature algorithm(DEFE) which can reduce the space complexity improve efficiency, thus overcoming limitations of many algorithm algorithms(EFE). However, DEFE does not consider outlier problem could deteriorate...

The Insulated Gate Bipolar Transistor(IGBT) life prediction is a technique that uses neural networks to predict the IGBT's remaining useful life(RUL). Past studies have discussed IGBT RUL under different situations, where models based on Recurrent Neural Network(RNN), Back Propagation(BP) Network, and other structures been widely used. With aging dataset provided by NASA PcOE research center, this paper introduces new approach stage. average accuracy of time-domain features 72.46%, one...

The Edwards SAPIENTM transcatheter heart valve is designed for heart-valve replacement in patients with severe aortic stenosis without open-heart surgery. Physiological finite element analysis (FEA) has been performed to provide an assessment of the fracture and fatigue resistance device during deployment operation. Experimental validation essential step establishing credibility computational modeling simulation [1,2]. present study validates FEA frame models by comparing crimping behavior...

An experimental investigation was conducted on 16MnR, a pressure vessel material widely used in China. Standard compact specimens were subjected to several different R-ratios (the ratio of the minimum load over maximum loading cycle) and amplitudes. Three notch sizes ranging from very sharp blunt used. In addition constant amplitude load, experiments with overloads being applied at crack lengths. Two-step high-low sequence study influence sequence. The results show that R-ratio has an...

The Edwards SAPIEN transcatheter heart valve (Figure 1) is designed for replacement in patients with severe aortic stenosis without open-heart surgery. Physiological FEA analyses have been performed to provide an assessment of the fracture and fatigue resistance device during deployment operation. present study validates frame models by comparing crimping behavior results experiments.

Establishing a gasoline octane loss value influence factor and prediction model can provide an optimization reference for industry to optimize the desulfurization olefin reduction process flow, in addition providing efficient low-cost method complement current complex high-cost measurement methods. In this paper, XGBoost Random Forest models are applied realize screening of problem. GBDT weighted combination using inverse error method. The problems such as large single corrected, combined...

Abstract Background: Liver fibrosis is a common consequence of chronic liver diseases resulting from multiple etiologies. Early clinical application shows that Ruangan Xiaoji Decoction (RGXJD) has very obvious effect on the treatment fibrosis. However, mechanism RGXJD cures requires further elucidation. Methods: In this work, therapeutic CCl 4 -induced fibroses serum and tissue metabolite changes in rat was analyzed by 1 H-NMR metabolomics. Meanwhile, histopathology examinations chemistry...