High loading carbon nanotubes deposited onto porous nickel yarns by solution imbibition as flexible wire-shaped supercapacitor electrodes

The deposition of active materials directly onto metal wires is a general strategy to prepare wire-shaped electrodes for flexible and wearable energy storage devices. However, it is still a critical challenge to coat active materials onto the aimed metal wires because of their smooth surface and small specific surface area. In this work, high porous nickel yarns（PNYs） was fabricated using commercial nylon yarns as templates through step-wise electroless plating, electroplating and calcination processes. The PNYs are composed of multiplied fibers with hollow tubular structure of 5–10 μm in diameter, allowing the imbibition of carbon nanotubes（CNTs） solution by a facile capillary action process. The prepared CNTs/PNY electrodes showed a typical electrochemical double layer capacitive performance and the constructed allsolid flexible wire-shaped symmetric supercapacitors provided a specific capacitance of 4.67 F/cm3 with good cycling stability at a current density of 0.6 A/cm3.

Water film area and dust removal efficiency of string grilles:a theoretical analysis

Based onmultiphase flowtheory and capillary mechanics,the dimensionless bond number expression of the influence of string grille wire spacing on droplet spreading is derived.Taking a liquid film formed by spreading droplets based on Kelvin correlation,the Young-Laplace equation,and the Hagen-Poiseuille law,an equation for calculating the thickness and height of the liquid film is established with temperature,relative humidity and molar volume of liquid phase as independent variables.According to the theory of string grille filtration and dust removal,a dust removal efficiency calculation model covering the wet string grille wire group is constructed based on the liquid film thickness,height,wire diameter,water film area,and vortex shedding frequency.Finally,a theoretical analysis of the influence of water film area on the efficiency of wet string grille dust removal is carried out based on the spray pressure and the ratio of string grille wire distance to wire diameter.It is found that the effect of spray pressure on water film area and dust removal efficiency is more significant than the string grille wire distance diameter ratio.Moreover,the optimized combination of wet string grille wire distance diameter ratio 0.84,wind speed 3m/s and spray pressure 0.8 MPa is found,which could provide an important reference for engineering applications.

Stains on imperfect textile

The imperfect material effect is one of the most important themes to obtain photo-realistic results in rendering.Textile material rendering has always been a key area in the field of computer graphics.So far,a great deal of effort has been invested in its unique appearance and physics-based simulation.The appearance of the dyeing effect commonly found in textiles has received little attention.This paper introduces techniques for simulation of staining effects on textiles.Pulling,wearing,squeezing,tearing,and breaking effects are more common imperfect effects of fabrics,these external forces will cause changes in the fabric structure,thus affecting the diffusion effect of stains.Based on the microstructure of yarn,we handle the effect of the stain on the imperfect textile surface.Our simulation results can achieve a photo-realistic effect.

Enhancement of properties of recycled coarse aggregate concrete using bacteria

Due to rapid construction,necessity for raw materials of concrete,especially coarse aggregate,tends to increase the danger of early exhaustion of the natural resources.An alternative source of raw materials would perhaps delay the advent of this early exhaustion.Recycled coarse aggregate(RCA)plays a great role as an alternative raw material that can replace the natural coarse aggregate(NCA)for concrete.Previous studies show that the properties of RCA concrete are inferior in quality compared to NCA concrete.This article attempts to study the improvement of properties of RCA concrete with the addition of bacteria named as Bacillus subtilis.The experimental inves-tigation was carried out to evaluate the improvement of the compres-sive strength,capillary water absorption,and drying shrinkage of RCA concrete incorporating bacteria.The compressive strength of RCA concrete is found to be increased by about 20%when the cell con-centration of B.subtilis is 10^(6) cells/ml.The capillary water absorptionas well as drying shrinkage of RCA are reduced when bacteria is incorpo-rated.The improvement of RCA concrete is confirmed to be due to the calcium carbonate precipitation as observed from the microstructure studies carried out on it such as EDX,SEM,and XRD.