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Friele Color Matching Model of Digital Rotor Spinning Viscose Mélange Fabric
Ruihua Yang,Kanglei Zhang,Zhuo Wang 한국섬유공학회 2022 Fibers and polymers Vol.23 No.4
Digital rotor spinning involves spinning fibers that have been dope-dyed together with one of several differenthues in a manner that enables the color tuning of the resultant yarn. A small inventory of colored fibers provides access to awide gamut of shades and production of textiles in a variety of colorways. To overcome the issues with the current intelligentcolor matching system for digital rotor spinning viscose melange yarn, in this study, a digital rotor spinning frame was used tospin selected red, yellow, and blue dope-dyed viscose staple fibers into 66 types of melange yarns at a ratio gradient of 10 %. The corresponding yarns were knitted as fabric samples, and then a Datacolor650 spectrophotometer was used to performcolor testing and record the experimental data. The parameter σ of the Friele model was assigned within [0,1]. The optimalvalue of σ was 0.134 when the average color difference of the bi-component melange sample was minimal, which was usedfor the construction of a color matching system based on the Friele model. In addition, this study verifies the obtained optimalvalue of σ using the full-spectrum color matching method. The average error between the predicted ratio and actual ratio ofthe three-component melange sample was 10.21 %, while the predicted average color difference was 0.4561. This indicatesthat the empirical parameters of the Friele model obtained in this study yield a good prediction accuracy of digital rotorspinning viscose melange products.
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Computational Studies on Mesh Stiffness of Paralleled Helical Beveloid Gear Pair
Ruihua Sun,Chaosheng Song,Caichao Zhu,Yawen Wang,Xingyu Yang 한국정밀공학회 2021 International Journal of Precision Engineering and Vol.22 No.1
Considering the asymmetrical left and right tooth profiles including the transient curve at the tooth root region and the varying thickness along the axial direction due to the cone angle, we build the accurate profile curve model including the transient curve at the tooth root of helical beveloid gear with machining parameters to solve the problem of non-applicability of real digital model. According to the feature of gear shape varying along tooth width direction, we introduced the slicing method and derived its grouping formula. Finally, the efficient and accurate slicing-based mesh stiff ness calculation model of paralleled helical beveloid gears was proposed using potential energy theory. Then, mesh stiff ness was calculated using finite element contact model for comparison and verification. Finally, the impacts of macro geometry parameters including cone angle, normal pressure angle, helix angle, tooth width and addendum coefficient on single and total mesh stiff ness were analyzed. The calculated mesh stiff ness correlates well with the results from FEM with the maximum peak error is 4.8%. Results show that the tooth width shows an obvious incremental impact on average total mesh stiff ness. When the pressure angle, helix angle, cone angle and addendum coefficient increase, the average total mesh stiff ness increases first and then decreases. For the fluctuating value, it increases as the tooth width, helix angle and cone angle increase. However, the pressure angle and addendum coefficient show an opposite impact on the fluctuating value.
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Fei Liu,Zhong Yang,Ruihua Yang,Ruifeng Wang,Jianhai Zhou 대한토목학회 2022 KSCE JOURNAL OF CIVIL ENGINEERING Vol.26 No.5
In view of the excessive heavy metals in soil will affect the quality of crops and the personal safety of local residents, in order to analyze and evaluate the migration characteristics and potential ecological risks of heavy metals in soil in the study area, the heavy metal content, pH, regional distribution, correlation, migration characteristics, enrichment state and potential risk in 0 − 1 m soil depth were tested and analyzed. The results show that the distribution of most metal elements is closely related to pH in the soil. The contents of elements As, Cr and Hg in the soil of the study area change in an “L” shape along with the buried depth, that is, the contents of As, Cr and Hg increase generally along with the buried depth of the soil, and the contents of elements Cd and Pb decrease along with the buried depth. By analyzing the enrichment degree of heavy metals and evaluating the ecological risk degree, it can be concluded that only element Hg is moderately enriched in the soil layer of 0 − 0.4 m and Cd is the main ecological risk factor, and the potential ecological risk degree of Yuyao is between slight and moderate ecological risks.
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Qian Liu,Bingchao Yang,Lujie Zhang,Ruihua Huang 한국화학공학회 2014 Korean Journal of Chemical Engineering Vol.31 No.9
A multifunction adsorbent was synthesized by incorporating AC into CTS, and the ratio of AC to CTSwas 1/1. The resultant was called activated carbon (AC)/chitosan (CTS) composite. The simultaneous adsorption ofphenol and Cu2+from aqueous solution onto AC/CTS composite was investigated by a batch procedure. The adsorptionprocesses for both Cu2+and phenol obeyed the pseudo second-order kinetic model. Phenol was prone to be adsorbedmore quickly as compared with Cu2+when they coexisted in solution. The adsorption behavior of both phenol and Cu2+followed the Langmuir isotherm. The maximum adsorption capacities of phenol and Cu2+were 34.19 mg/g and 74.35mg/g at 293 K, respectively. No obvious competitive adsorption existed between phenol and Cu2+.
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Adsorptive removal of Cr(VI) from aqueous solutions by cross-linked chitosan/bentonite composite
Qian Liu,Bingchao Yang,Lujie Zhang,Ruihua Huang 한국화학공학회 2015 Korean Journal of Chemical Engineering Vol.32 No.7
Cross-linked chitosan/bentonite composite (CCB) was prepared, and characterized by Fourier transform infrared (FTIR) spectroscopy, BET surface area and pore diameter analyses, X-ray diffraction (XRD) patterns and thermal gravimetric analyses (TGA). The adsorption of hexavalent chromium Cr(VI) onto CCB as a function of adsorbent dosage, initial Cr(VI) concentration, solution pH, and contact time was investigated through batch experiments. The removal towards Cr(VI) decreased with increasing solution pH from 2 to 11 and initial Cr(VI) concentration, while it increased with increasing adsorbent dosage. The adsorption kinetic data of Cr(VI) on CCB were well described by the pseudo-second-order model. The equilibrium data were correlated by the Langmuir isotherm model. The maximum monolayer Cr(VI) adsorption capacity for CCB at pH 2 and 293 K was 89.13mg/g. The mechanisms for the adsorption of Cr(VI) on CCB at pH 2 may include electrostatic interaction and chemical interaction between CCB and Cr(VI) ions.
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