In this study, the application of superabsorbent resin (SAP) in inhibiting the soil moisture evaporation (or slowing down the water outflow) was studied. The clay‐SAP composites were fabricated by grafting of poly (acrylic acid‐N‐hydroxymethyl acrylamide/clay) (GT‐g‐P [AA‐co‐NHA]/clay) on Tragacanth gum (GT), using solution polymerization. The structure, morphology and stability of the clay‐SAP composites were investigated by Fourier transform infrared, scanning electron microscope and TGA. The maximum swelling ratio of Attapulgite (3%)‐, Kaolin (3%)‐ and Montmorillonite (3%)‐SAP composite in deionized water reached 1180, 819 and 525 g/g respectively, and the maximum swelling ratio in tap water reached up to 206, 192 and 170 g/g respectively. Meanwhile, the maximum swelling ratio in 0.9% NaCl solution was 95, 82 and 62 g/g respectively. The water retention of clay‐SAP composites was also analyzed as a function of temperature. In addition, by simulating the desertification area, the effect of the APT (3%)‐SAP composite on the anti‐evaporation performance was studied. The obtained results revealed that the water retention of APT (3%)‐SAP composite was 36% at 45°C for 12 h. Under natural conditions, the evaporation rate of the anti‐evaporation material was inversely proportional to the amount of APT (3%)‐SAP composite added.
The foundation of urban computing and smart technology is edge computing. Edge computing provides a new solution for large-scale computing and saves more energy while bringing a small amount of latency compared to local computing on mobile devices. To investigate the relationship between the cost of computing tasks and the consumption of time and energy, we propose a computation offloading scheme that achieves lower execution costs by cooperatively allocating computing resources by mobile devices and the edge server. For the mixed-integer nonlinear optimization problem of computing resource allocation and offloading strategy, we segment the problem and propose an iterative optimization algorithm to find the approximate optimal solution. The numerical results of the simulation experiment show that the algorithm can obtain a lower total cost than the baseline algorithm in most cases.
A sesbania gum-g-poly (acrylic acid-co-vinyl acetate) (SG-g-P (AA-co-VAc)) emulsion was prepared by free radical polymerization using environmentalfriendly sesbania gum (SG) as raw material and grafted with acrylic acid and vinyl acetate. It was applied to study the performance of preventing water leakage from the soil. The effects of acrylic acid/vinyl acetate (AA/VAc) monomer ratio, neutralization degree of AA, content of ammonium persulfate and polymerization temperature on the properties of emulsion were investigated. Characterization of the emulsion by FTIR, SEM, TGA, and particle size distribution showed that AA and VAc were successfully grafted onto SG. SG-g-P (AA-co-VAc) had good stability under the optimum synthesis condition. Compared to SG, the thermal stability of the product was improved. The consolidation layer was formed after the product was added to the soil, which might reduce the voids between soil particles and reduce the water penetration rate. This greatly expanded its application in the research of anti-leakage performance.
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