CO2-responsive Pickering emulsion stablized by modified silica nanoparticles: A dissipative particle dynamics simulation study

Yan Wang,Hongbing Wang,Chunling Li,Shuangqing Sun,Songqing Hu 한국공업화학회 2021 Journal of Industrial and Engineering Chemistry Vol.97 No.-

Dissipative particle dynamics (DPD) simulations were applied to investigate the effect of SiO2nanoparticles (SNPs) modified with different tertiary amine chain length and concentration on O/Wemulsion properties, the influence mechanism was also revealed from the molecular level. On this basis,the influence of the modified SNPs volume fraction in the emulsion system was studied. The resultsshowed that with the increase number of tertiary amine chain alkyl carbon, the stability of the originalemulsion system wasfirst enhanced and then weakened while the responsiveness of the protonatedemulsion system wasfirst weakened and then slightly enhanced, the number of tertiary amine chainsmodified on SNPs has the same influence rule on emulsion performance, which was determined by thehydrophobicity of modified SNPs. In addition, with the increase of the modified SNPs volume fraction inthe emulsion system, the stability of the emulsion is gradually enhanced. However, when the volumefraction of SiO2 exceeds 3%, the amplitude of stability enhancement decreases. The increase in theinteraction energy between oil droplets in the equilibrium process is caused by emulsion fusion, which inturn is affected by SNPs. The repulsive force between oil and water is greater than that between two oildrops, which is the reason for the oil drop fusion. The presence of SNPs can reduce the repulsive forcebetween oil and water to different degrees, thus slowing down the fusion of emulsion.

Finite-time Peak-to-peak Gain Minimization

Honghai Wang,Chunling Wang,Yang Zheng,Zihong Chen,Shuping He 제어·로봇·시스템학회 2019 International Journal of Control, Automation, and Vol.17 No.2

The finite-time peak-to-peak filtering problem is studied for a class of linear dynamic systems. By reconstructingthe system, the dynamic filtering error system is obtained. Our aim is to design a peak-to-peak filtersuch that the induced L∞ gain from the unknown disturbance to the estimated errors is minimized with respect tothe finite-time interval. By using a proper Lyapunov function, sufficient conditions are established on the existenceof peak-to-peak filter which also guarantees the finite-time boundedness of the filtering error dynamic systems. Thedesign criteria are presented in the form of linear matrix inequalities and then described as an optimization problem. Simulation results are given to illustrate the validity of the proposed approaches.

Tunable stability of oil-containing foam systems with different concentrations of SDS and hydrophobic silica nanoparticles

Shuangqing Sun,Yan Wang,Congtai Yuan,Hongbing Wang,Wendong Wang,Jianhui Luo,Chunling Li,Songqing Hu 한국공업화학회 2020 Journal of Industrial and Engineering Chemistry Vol.82 No.-

Experiment and molecular dynamics simulation were carried out to study the tunable stability of oilcontainingSDS-stabilized Nitrogen-in-water foam. The experimental results show that the foam stabilitycould be tuned by the concentrations of SDS and modified SiO2 nanoparticles. In the foam systems with alow SDS concentration (0.2 wt.%), the foams show poor stability and the foam stability was almost notaffected by the addition of modified SiO2 nanoparticles. The foam stability was greatly improved atmoderate SDS concentration (0.5 wt.%), it enhancedfirst and then weakened with the increase ofmodified SiO2 concentration, and the half-life time achieved a maximum value of 1292 s at 0.05 wt.%modified SiO2. However, at high SDS concentration (0.8 wt.%), the foam stability was pretty good exceptfor when the modified SiO2 concentration is too high (>0.2 wt.%). The microscopic mechanism wasobtained by investigating the structural and dynamic properties of the foamfilm. The simulation workshowed consistent results of foam stability with the experimental results. Moreover, it also revealed thatthe concentration and configuration of SDS will affect its interaction with SiO2 and oil molecule, which iscritical to foam stability.

Biphasic effects of ANP infusion in conscious, euvolumic rats: roles of AQP2 and ENaC trafficking.

Wang, Weidong,Li, Chunling,Nejsum, Lene N,Li, Hongyan,Kim, Soo Wan,Kwon, Tae-Hwan,Jonassen, Thomas E N,Knepper, Mark A,Thomsen, Klaus,Frokiaer, Jorgen,Nielsen, Soren American Physiological Society 2006 American journal of physiology. Renal physiology Vol.290 No.2

<P>Atrial natriuretic peptide (ANP) acutely promotes water and sodium excretion, whereas subchronic effects involve water retention. Renal hemodynamics, water and sodium excretion, and aquaporin-2 (AQP2) and epithelial Na channel (ENaC) subcellular trafficking were determined in response to continuous ANP infusion in conscious rats, where body sodium and fluid balance was constantly maintained. ANP (0.5 microg x kg(-1) x min(-1)) evoked a transient (peak at 10 min) fivefold diuresis followed by reduced urine production to control levels (30- to 90-min period). The fractional distal water excretion was significantly increased initially and then decreased in response to ANP. There was no change in the subcellular localization of AQP2 and AQP2 phosphorylated in PKA consensus site S256 (p-AQP2) 10 min after ANP infusion. In contrast, after 90 min a marked increase in apical labeling of AQP2 and p-AQP2 was observed in the inner and outer medullary collecting ducts but not in cortical collecting ducts. In support of this, ANP induced plasma membrane targeting of AQP2 in transiently AQP2-transfected cells. ANP infusion evoked an instant increase in renal sodium excretion, which persisted for 90 min. Ten minutes of ANP infusion induced no changes in the subcellular localization of ENaC subunits, whereas a marked increase in apical targeting of alpha- and gamma-subunits was observed after 90 min. In conclusion, 1) ANP infusion induced a sustained natriuresis and transient diuresis; 2) there were no changes in the subcellular localization of AQP2 and ENaC subunits after 10 min of ANP infusion; and 3) there was a marked increase in apical targeting of AQP2, p-AQP2, and alpha- and gamma-ENaC after 90 min of ANP infusion. The increased targeting of ENaC and AQP2 likely represents direct or compensatory effects to increase sodium and water reabsorption and to prevent volume depletion in response to prolonged ANP infusion.</P>

alpha-MSH prevents impairment in renal function and dysregulation of AQPs and Na-K-ATPase in rats with bilateral ureteral obstruction.

Li, Chunling,Shi, Yimin,Wang, Weidong,Sardeli, Chrysanthi,Kwon, Tae-Hwan,Thomsen, Klaus,Jonassen, Thomas,Djurhuus, Jens Christian,Knepper, Mark A,Nielsen, Soren,Frokiaer, Jorgen American Physiological Society 2006 American Journal of Physiology Vol.290 No.2

<P>The purpose of this study was to evaluate the effects of the anti-inflammatory hormone alpha-melanocyte-stimulating hormone (alpha-MSH) treatment on renal function and expression of aquaporins (AQPs) and Na-K-ATPase in the kidney in response to 24 h of bilateral ureteral obstruction (BUO) or release of BUO (BUO-R). In rats with 24-h BUO, immunoblotting revealed that downregulation of AQP2 and AQP3 was attenuated (AQP2: 38 +/- 5 vs. 13 +/- 4%; AQP3: 44 +/- 3 vs. 19 +/- 4% of sham levels; P < 0.05), whereas downregulation of Na-K-ATPase was prevented by alpha-MSH treatment (Na-K-ATPase: 94 +/- 7 vs. 35 +/- 5% of sham levels; P < 0.05). Immunocytochemistry confirmed the changes in AQP1 and Na-K-ATPase expression. Renal tubular cell apoptosis was confirmed in BUO kidneys, and alpha-MSH treatment virtually completely abolished apoptosis. Furthermore, we measured glomerular filtration rate (GFR) and effective renal plasma flow (ERPF), respectively. Forty-eight hours after BUO-R demonstrated that alpha-MSH treatment almost completely prevented the decrease in GFR (nontreated: 271 +/- 50; alpha-MSH: 706 +/- 85; sham: 841 +/- 105 microl x min(-1).100 g body wt(-1), P < 0.05) and ERPF (nontreated: 1,139 +/- 217; alpha-MSH: 2,598 +/- 129; sham: 2,633 +/- 457 microl x min(-1).100 g body wt(-1), P < 0.05). alpha-MSH treatment also partly prevented the downregulation of AQP1 and Na-K-ATPase expression in rats after BUO-R for 48 h. In conclusion, alpha-MSH treatment significantly prevents impairment in renal function and also prevents downregulation of AQP2, AQP3, and Na-K-ATPase during BUO or AQP1 and Na-K-ATPase after BUO-R, demonstrating a marked renoprotective effect of alpha-MSH treatment in conditions with urinary tract obstruction.</P>

An Evaluative Study of the Operational Safety of High-Speed Railway Stations Based on IEM-Fuzzy Comprehensive Assessment Theory

Li Wang,Chunling Jin,Chongqi Xu 한국정보처리학회 2020 Journal of information processing systems Vol.16 No.5

The general situation of system composition and safety management of high-speed railway terminal isinvestigated and a comprehensive evaluation index system of operational security is established on the basis ofrailway laws and regulations and previous research results to evaluate the operational security management ofthe high-speed railway terminal objectively and scientifically. Index weight is determined by introducinginterval eigenvalue method (IEM), which aims to reduce the dependence of judgment matrix on consistencytest and improve judgment accuracy. Operational security status of a high-speed railway terminal in northwestChina is analyzed using the traditional model of fuzzy comprehensive evaluation, and a general technique ideaand references for the operational security evaluation of the high-speed railway terminal are provided. IEM isintroduced to determine the weight of each index, overcomes shortcomings of traditional analytic hierarchyprocess (AHP) method, and improves the accuracy and scientificity of the comprehensive evaluation. Riskfactors, such as terrorist attacks, bad weather, and building fires, are intentionally avoided in the selection ofevaluation indicators due to the complexity of risk factors in the operation of high-speed railway passengerstations and limitation of the length of the paper. However, such risk factors should be considered in the followupstudies.

Effect of water on Cu/Zn catalyst for hydrogenation of fatty methyl ester to fatty alcohol

Hui Huang,Chunling Fan,Shaohong Wang,Shujia Wang,Guiping Cao 한국화학공학회 2009 Korean Journal of Chemical Engineering Vol.26 No.6

The effect of water on Cu/Zn catalyst prepared by co-precipitation for hydrogenation of methyl laurate in a slurry phase was studied using a stirred autoclave reactor system. The catalysts were characterized by means of XRD, BET, H2-TPR, SEM and TEM. The results indicate that catalytic activity decreases with increased amount of water in methyl laurate. Correlating with the results from the above characterization, it is found that the main causes for the water deactivation of the Cu/Zn catalyst were the water occlusion of active catalyst sites by the low solubility of water in the substrate and the promotion of crystal growth, as well as the Cu/Zn catalyst agglomeration in the presence of water.

Therapeutic inhibition of SGK1 suppresses colorectal cancer

Xuchun Liang,Chunling Lan,Guanming Jiao,Wencheng Fu,Xuesha Long,Yu An,Kejin Wang,Jinzhe Zhou,Ting Chen,Yongqin Li,Jiahong Xu,Qi Huang,Bin Xu,Junjie Xiao 생화학분자생물학회 2017 Experimental and molecular medicine Vol.49 No.-

Colorectal cancer (CRC) is one of the leading causes of death worldwide. Thus, the development of new therapeutic targets for CRC treatment is urgently needed. SGK1 is involved in various cellular activities, and its dysregulation can result in multiple cancers. However, little is known about its roles and associated molecular mechanisms in CRC. In present study, we found that SGK1 was highly expressed in tumor tissues compared with peri-tumor samples from CRC patients. In vitro experiments revealed that SGK1 overexpression promoted colonic tumor cell proliferation and migration and inhibited cell apoptosis induced by 5-fluorouracil (5-FU), while SGK1 shRNA and inhibitors showed the inverse effects. Using CRC xenograft mice models, we demonstrated that knockdown or therapeutic inhibition of SGK1 repressed tumor cell proliferation and tumor growth. Moreover, SGK1 inhibitors increased p27 expression and promoted p27 nuclear accumulation in colorectal cancer cells, and p27 siRNAs could attenuate the repression of CRC cell proliferation induced by SGK1 inhibitors. Collectively, SGK1 promotes colorectal cancer development via regulation

Image Reconstruction Based on Deep Learning for the SPIDER Optical Interferometric System

Yan Sun,Chunling Liu,Hongliu Ma,Wang Zhang 한국광학회 2022 Current Optics and Photonics Vol.6 No.3

Segmented planar imaging detector for electro-optical reconnaissance (SPIDER) is an emerging technology for optical imaging. However, this novel detection approach is faced with degraded imaging quality. In this study, a 6 × 6 planar waveguide is used after each lenslet to expand the field of view. The imaging principles of field-plane waveguide structures are described in detail. The local multiplesampling simulation mode is adopted to process the simulation of the improved imaging system. A novel image-reconstruction algorithm based on deep learning is proposed, which can effectively address the defects in imaging quality that arise during image reconstruction. The proposed algorithm is compared to a conventional algorithm to verify its better reconstruction results. The comparison of different scenarios confirms the suitability of the algorithm to the system in this paper.

Effects of solvent properties on cationic dyeing process of acrylic yarn

Zhengyu Zhang,Chunling Zheng,Ailing Yuan,Haibo Wang,Ling Zhu,Hong Xu 한국화학공학회 2014 Korean Journal of Chemical Engineering Vol.31 No.4

Cationic dye is a special dye for acrylics, but it is very difficult in dyeing through the core. In practice,the price of a special leveling agent for acrylic fiber is high, and uniform staining is poor. By mixing a number of organicsolvents in the dye bath, we can improve the structure of fibers and their deep-dyeing. We used n-propanol, isopropanoland benzyl alcohol as organic solvents, by adjusting the pH value and the appropriate temperature, and with specialdepth and leveling agent for dyeing soaping fastness contrast, to find economically viable process conditions.