A Method for Planning the Transportation Route of Fresh Agricultural Products Based on Ant Colony Algorithm

The current fresh agricultural product transportation route planning matrix is generally set in a single form, resulting in low path planning efficiency and increased path transportation time. Therefore, the design and analysis of a fresh agricultural product transportation route planning method based on the ant colony algorithm is proposed in this paper. The optimal path problem and planning nodes are described based on actual planning needs and standards. A multi-objective form is adopted to improve path planning efficiency, and a multi-objective optimal planning matrix and ant colony calculation line planning model are designed. Based on this, path planning processing is implemented using time and space route correction. The test results show that compared to the traditional CiteSpace fresh agricultural product transportation route planning test group and the traditional improved genetic algorithm fresh agricultural product transportation route planning test group, a better control of the path transportation time within 150 minutes is achieved by the ant colony algorithm fresh agricultural product transportation route planning test group designed this time. This indicates that the designed transportation route is considered the optimal route. Furthermore, after research, it was found that the arrival times of the six selected delivery points were all before the expected earliest arrival time, suggesting that this planning method has greater effectiveness and practical application value

Constitutive equation for the hot deformation behavior of Csf/AZ91D composites and its validity for numerical simulation

The flow stress behavior of 10 vol. % short carbon fibers reinforced AZ91D composites (C-sf/AZ91D) were investigated by hot compression test. The results show the flow stress reach the peak value at small strain and then decrease monotonically until the end of the large strain, which exhibits an obvious dynamic strain softening. The decrease of stress level with deformation temperature increasing or strain rate decreasing can be represented by Zener-Hollomon parameter in a hyperbolic sine equation. By considering the effect of strain on material constants, a modified viscoplastic constitutive equation was established to characterize the dependence of flow stress on the deformation temperature, strain, and strain rate. The stress-strain values calculated by the constitutive equation are in consistent with the experimental results. Applying the constitutive equation, the plastic deformation of C-sf/AZ91D) composites during the hot compression process were analyzed by finite element simulation. The calculated punch force-stroke curves agree well with the measured ones. The results confirmed that the established constitutive equation can accurately describe the hot plastic deformation behavior of C-sf/AZ91D composites, and can be used for the finite element analysis on the hot forming process. (C) 2016 Elsevier Ltd. All rights reserved

On the Relationships between Indexes of Merchant Vessel Accidents and Indexes of Economy and Shipping

ABSTRACT: The statistics and analysis of the four accident indexes and the four marine transportation indexes have been carried out to indicate situations of marine safety and marine transportation in China. By grey correlation analysis, the main findings is that the number of marine traffic accidents is mainly determined by the number of merchant vessels; the number of foundering is mainly determined by freight amount, and the number of death and missing is mainly determined by the number of merchant vessels

HfB2-SiC-MoSi2 oxidation resistance coating fabricated through in-situ synthesis for SiC coated C/C composites

A brand new HfB2-SiC-MoSi2 coating was fabricated to protect carbon/carbon (C/C) composites with inner SiC coating from oxidation, which was prepared by in-situ synthesis. In this paper, the C/C substrate with the protection of the HfB2-SiC-MoSi2/SiC coating could resist oxidation in 1773 K air for 408 h. The double coating also presented expected oxidation protection performance at dynamic oxidation environment. In the test process, the surface coating was oxidized to form a self-sealing silicate glass layer containing HfO2 and HfSiO4, which could hinder crack propagation in coating

Microwave-assisted rapid preparation of hollow carbon nanospheres@TiN nanoparticles for lithium-sulfur batteries

Highly conductive titanium nitride (TiN) has a strong anchoring ability for lithium polysulfides (LiPSs). However, the complexity and high cost of fabrication limit their practical applications. Herein, a typical structure of hollow carbon nanospheres@TiN nanoparticles (HCNs@TiN) was designed and successfully synthesized via a microwave reduction method with the advantages of economy and efficiency. With unique structural and outstanding functional behavior, HCN@TiN-S hybrid electrodes display not only a high initial discharge capacity of 1097.8 mA h g−1 at 0.1C, but also excellent rate performance and cycling stability. After 200 cycles, a reversible capacity of 812.6 mA h g−1 is still retained, corresponding to 74% capacity retention of the original capacity and 0.13% decay rate per cycle, which are much better than those of HCNs-S electrodes

Metastable Olivine within Oceanic Lithosphere in the Uppermost Lower Mantle Beneath the Eastern United States

Approximately two-thirds of Earth\u27s outermost shell is composed of oceanic plates that form at spreading ridges and recycle back to Earth\u27s interior in subduction zones. A series of physical and chemical changes occur in the subducting lithospheric slab as the temperature and pressure increase with depth. In particular, olivine, the most abundant mineral in the upper mantle, progressively transforms to its high-pressure polymorphs near the mantle transition zone, which is bounded by the 410 km and 660 km discontinuities. However, whether olivine still exists in the core of slabs once they penetrate the 660 km discontinuity remains debated. Based on SKS and SKKS shear-wave differential splitting times, we report new evidence that reveals the presence of metastable olivine in the uppermost lower mantle within the ancient Farallon plate beneath the eastern United States. We estimate that the low-density olivine layer in the subducted Farallon slab may compensate the high density of the rest of the slab associated with the low temperature, leading to neutral buoyancy and preventing further sinking of the slab into the deeper part of the lower mantle

Soil compounding promotes the improvement of aeolian sandy soil in the Mu Us Sandy Land

Aeolian sandy soil and loess soil of the Mu Us Sandy Land are used as the research material in this study to investigate the effect of soil compounding on the improvement of aeolian sandy soil and to provide a feasible approach for sand prevention and sand control. In particular, loess soils were compounded at 0%, 20%, 40%, 60%, 80%, and 100% by volume percentage of the compounded soils. The improvement benefits of compounded soils on their textural properties, water-holding capacity, and fertilizer-retention capacity at different blending ratios were evaluated. The results showed that following the compounding of aeolian sandy and loess soils, with the increase of the loess proportion, the texture type of the compounded soil transforms from sandy soil to loamy sandy soil to sandy loam to loamy soil to powdery loam. Moreover, granular gradation was observed, the bulk density gradually decreased, the capillary porosity gradually increased, and the performance of water- and fertilizer-holding properties gradually increased and strengthened. The spatial variability of compounded soil bulk density, capillary porosity, and the water-holding and fertilizer-retention properties was almost entirely controlled by the proportion of loess soil. A theoretical basis is provided in this study for aeolian sandy soil improvement in the Mu Us Sandy Land that can be extended to similar areas, providing a feasible sand management approach