Facile and Effective Preparation of the Lotus Leaf-based Adsorbent by Exposing Cellulose Nanocrystal for Waste Water Treatment and Air Purification

Huiyu Yang,Ke Liu,Xin Liu,Yaling Wang,Keshuai Liu,Fengxiang Chen,Bo Deng,Weilin Xu 한국섬유공학회 2020 Fibers and polymers Vol.21 No.2

One substantial plant waste, lotus leave was fabricated into lotus leave powder with different diameters by ball milling. The surface morphology, chemical composition, particle size, porosity parameters, crystal structure, and wettabilityof lotus leaf powders (LLPs) were analyzed by scanning electron microscopy (SEM), high resolution transmission electron microscopy (HR-TEM), Fourier-transform infrared (FT-IR) spectroscopy, X-ray photoelectron spectroscopy (XPS), laser particle size analysis, N2 adsorption/desorption, X-ray diffraction (XRD) analysis, and water contact angle (WCA) analysis, respectively. The results showed that the micro- and nanoscale waxy papilla structures on the surface of the lotus leaf were gradually destroyed by mechanical forces along with extended balling time. Accompanied re-exposing of -OH affluent cellulose nanocrystals (CNCs) was proved by HR-TEM, XRD, and FTIR. FTIR also revealed a hydroxyl to carboxyl transition on the surface of CNCs. Both the re-exposure of CNCs and thereof chemical structure transition after ball millingmade the LLP a good candidate for pollutant adsorbent for dye, formaldehyde, and heavy metal ions.

Numerical study of a two-stage turbine characteristic under pulsating flow conditions

Rongchao Zhao,Weilin Zhuge,Yangjun Zhang,Mingyang Yang,Ricardo Martinez-Botas 대한기계학회 2016 JOURNAL OF MECHANICAL SCIENCE AND TECHNOLOGY Vol.30 No.2

With developments of turbo-compounding and two-stage turbocharging technologies, two-stage turbine is increasingly applied in automotive engines. This paper numerically investigates the characteristic of a two-stage turbine on a turbo-compound engine under pulsating flow conditions. The behaviors of turbine stages with the swallowing capacity ratio (SR) equals to 2.0, under low, mid and high load conditions were studied. Results show that the Low pressure turbine (LPT) is more sensitive to the pulsating flow, especially at low load conditions, compared with High pressure turbine (HPT). It is caused by the dramatic change of velocity ratio in LPT. Results also show that the load split between HPT and LPT under pulsating flow conditions deviates from that at quasi-steady conditions, indicating the different behaviors of the two-stage turbine under pulsating conditions.

Prediction of Pharmacokinetics and Penetration of Moxifloxacin in Human with Intra-Abdominal Infection Based on Extrapolated PBPK Model

Zhu, LiQin,Yang, JianWei,Zhang, Yuan,Wang, YongMing,Zhang, JianLei,Zhao, YuanYuan,Dong, WeiLin The Korean Society of Pharmacology 2015 The Korean Journal of Physiology & Pharmacology Vol.19 No.2

The aim of this study is to develop a physiologically based pharmacokinetic (PBPK) model in intra-abdominal infected rats, and extrapolate it to human to predict moxifloxacin pharmacokinetics profiles in various tissues in intra-abdominal infected human. 12 male rats with intra- abdominal infections, induced by Escherichia coli, received a single dose of 40 mg/kg body weight of moxifloxacin. Blood plasma was collected at 5, 10, 20, 30, 60, 120, 240, 480, 1440 min after drug injection. A PBPK model was developed in rats and extrapolated to human using GastroPlus software. The predictions were assessed by comparing predictions and observations. In the plasma concentration versus time profile of moxifloxcinin rats, $C_{max}$ was $11.151{\mu}g/mL$ at 5 min after the intravenous injection and $t_{1/2}$ was 2.936 h. Plasma concentration and kinetics in human were predicted and compared with observed datas. Moxifloxacin penetrated and accumulated with high concentrations in redmarrow, lung, skin, heart, liver, kidney, spleen, muscle tissues in human with intra-abdominal infection. The predicted tissue to plasma concentration ratios in abdominal viscera were between 1.1 and 2.2. When rat plasma concentrations were known, extrapolation of a PBPK model was a method to predict drug pharmacokinetics and penetration in human. Moxifloxacin has a good penetration into liver, kidney, spleen, as well as other tissues in intra-abdominal infected human. Close monitoring are necessary when using moxifloxacin due to its high concentration distribution. This pathological model extrapolation may provide reference to the PK/PD study of antibacterial agents.

Prediction of Pharmacokinetics and Penetration of Moxifloxacin in Human with Intra-Abdominal Infection Based on Extrapolated PBPK Model

LiQin Zhu,JianWei Yang,Yuan Zhang,YongMing Wang,JianLei Zhang,YuanYuan Zhao,WeiLin Dong 대한약리학회 2015 The Korean Journal of Physiology & Pharmacology Vol.19 No.2

The aim of this study is to develop a physiologically based pharmacokinetic (PBPK) model in intraabdominalinfected rats, and extrapolate it to human to predict moxifloxacin pharmacokinetics profilesin various tissues in intra-abdominal infected human. 12 male rats with intra- abdominal infections,induced by Escherichia coli, received a single dose of 40 mg/kg body weight of moxifloxacin. Bloodplasma was collected at 5, 10, 20, 30, 60, 120, 240, 480, 1440 min after drug injection. A PBPK modelwas developed in rats and extrapolated to human using GastroPlus software. The predictions wereassessed by comparing predictions and observations. In the plasma concentration versus time profileof moxifloxcinin rats, Cmax was 11.151 μg/mL at 5 min after the intravenous injection and t1/2 was2.936 h. Plasma concentration and kinetics in human were predicted and compared with observed datas. Moxifloxacin penetrated and accumulated with high concentrations in redmarrow, lung, skin, heart,liver, kidney, spleen, muscle tissues in human with intra-abdominal infection. The predicted tissue toplasma concentration ratios in abdominal viscera were between 1.1 and 2.2. When rat plasma concentrationswere known, extrapolation of a PBPK model was a method to predict drug pharmacokineticsand penetration in human. Moxifloxacin has a good penetration into liver, kidney, spleen, as well asother tissues in intra-abdominal infected human. Close monitoring are necessary when using moxifloxacindue to its high concentration distribution. This pathological model extrapolation may provide referenceto the PK/PD study of antibacterial agents.

Universal Indicators for Oil and Gas Prospecting Based on Bacterial Communities Shaped by Light-Hydrocarbon Microseepage in China

Deng, Chunping,Yu, Xuejian,Yang, Jinshui,Li, Baozhen,Sun, Weilin,Yuan, Hongli The Korean Society for Microbiology and Biotechnol 2016 Journal of microbiology and biotechnology Vol.26 No.7

Light hydrocarbons accumulated in subsurface soil by long-term microseepage could favor the anomalous growth of indigenous hydrocarbon-oxidizing microorganisms, which could be crucial indicators of underlying petroleum reservoirs. Here, Illumina MiSeq sequencing of the 16S rRNA gene was conducted to determine the bacterial community structures in soil samples collected from three typical oil and gas fields at different locations in China. Incubation with n-butane at the laboratory scale was performed to confirm the presence of "universal microbes" in light-hydrocarbon microseepage ecosystems. The results indicated significantly higher bacterial diversity in next-to-well samples compared with background samples at two of the three sites, which were notably different to oil-contaminated environments. Variation partitioning analysis showed that the bacterial community structures above the oil and gas fields at the scale of the present study were shaped mainly by environmental parameters, and geographic location was able to explain only 7.05% of the variation independently. The linear discriminant analysis effect size method revealed that the oil and gas fields significantly favored the growth of Mycobacterium, Flavobacterium, and Pseudomonas, as well as other related bacteria. The relative abundance of Mycobacterium and Pseudomonas increased notably after n-butane cultivation, which highlighted their potential as biomarkers of underlying oil deposits. This work contributes to a broader perspective on the bacterial community structures shaped by long-term light-hydrocarbon microseepage and proposes relatively universal indicators, providing an additional resource for the improvement of microbial prospecting of oil and gas.

Novel Structural Composite Yarns Spun with Harmonic Migrations of Filaments

Duo Xu,Hang Fan,Wangwang Yang,Keshuai Liu,Weilin Xu 한국섬유공학회 2022 Fibers and polymers Vol.23 No.6

A novel structural composite yarn was fabricated by periodically forcing filaments with harmonic migrations toenhance the cooperativity between filaments and staple fibers. The geometrical principle of yarn structure variations causedby harmonic migrations of filaments was theoretically analyzed, then demonstrated the influences of filament’s positions ondifferent shapes of the composite spinning-triangle zone. Further, the novel structural composite yarn structure was comparedto the seven models of composite yarns which were established with different filament’s positions, showing a varied filamenthelical structure to capture and then lock internal and external staple fibers, distinguishing that other composite yarns inliterature. Then, a synergetic eccentric device was employed to oscillate two filaments to conduct confirmatory tests. Theonline observations of the dynamic spinning-triangle zone were technically applied to evaluate the filaments’ harmonicmigrations. Furthermore, the yarn structural variations were caused by various geometrical configurations. Experimentalresults exhibited that the novel structural composite yarn had relatively fewer hairiness, medium irregularity, and strengthafter comparisons with other composite yarns. Altogether, the cyclically harmonic migrations of filaments were promising asan efficient and novel method for control the configurations between filaments and staple fibers.

Universal Indicators for Oil and Gas Prospecting Based on Bacterial Communities Shaped by Light-Hydrocarbon Microseepage in China

( Chunping Deng ),( Xuejian Yu ),( Jinshui Yang ),( Baozhen Li ),( Weilin Sun ),( Hongli Yuan ) 한국미생물 · 생명공학회 2016 Journal of microbiology and biotechnology Vol.26 No.6

Light hydrocarbons accumulated in subsurface soil by long-term microseepage could favor the anomalous growth of indigenous hydrocarbon-oxidizing microorganisms, which could be crucial indicators of underlying petroleum reservoirs. Here, Illumina MiSeq sequencing of the 16S rRNA gene was conducted to determine the bacterial community structures in soil samples collected from three typical oil and gas fields at different locations in China. Incubation with n-butane at the laboratory scale was performed to confirm the presence of "universal microbes" in light-hydrocarbon microseepage ecosystems. The results indicated significantly higher bacterial diversity in next-to-well samples compared with background samples at two of the three sites, which were notably different to oil-contaminated environments. Variation partitioning analysis showed that the bacterial community structures above the oil and gas fields at the scale of the present study were shaped mainly by environmental parameters, and geographic location was able to explain only 7.05% of the variation independently. The linear discriminant analysis effect size method revealed that the oil and gas fields significantly favored the growth of Mycobacterium, Flavobacterium, and Pseudomonas, as well as other related bacteria. The relative abundance of Mycobacterium and Pseudomonas increased notably after n-butane cultivation, which highlighted their potential as biomarkers of underlying oil deposits. This work contributes to a broader perspective on the bacterial community structures shaped by long-term light-hydrocarbon microseepage and proposes relatively universal indicators, providing an additional resource for the improvement of microbial prospecting of oil and gas.

Data-driven Sliding Mode Control for MIMO systems and Its Application on Linear Induction Motors

Dezhi Xu,Xiaoqi Song,Bin Jiang,Weilin Yang,Wenxu Yan 제어·로봇·시스템학회 2019 International Journal of Control, Automation, and Vol.17 No.7

In this paper, a model free adaptive integral sliding mode constrained control (MFAISMCC) is proposedto maintain the flux linkage of a linear induction motor (LIM) while tracking the speed reference. Firstly, themathematica model of a LIM is given after the electrical analysis. In order to linearize the motor system, thetechnology of compact form dynamic linearzation (CFDL) is applied. Then, the MFAISMCC is proposed basedon the analysed linear model. Furthermore, a novel anti-windup compensator for MIMO systems is proposed incase the actuator is within saturation. The whole closed-system stability is proven by Lyapunov stability method. Finally, some simulation results are given to testify the effectiveness of the proposed method compared with thePID controllers.