Effect of Calcium Chloride on Dyeing Property of Polyamide 66 Based on Reactive Anthraquinone Dyes with Different Structure

Hongjuan Zhang,Aiqin Gao,Kongliang Xie,Aiqin Hou 한국섬유공학회 2019 Fibers and polymers Vol.20 No.10

The effect of calcium chloride on dyeing property of polyamide 66 based on reactive anthraquinone dyes withdifferent structures were investigated. The relationship of the structure and properties of the reactive anthraquinone dyes wasdiscussed. Calcium chloride could obviously improve the exhaustion and fixation of the reactive dyes on polyamide 66. Thedyes with more sulfonate groups exhibited obviously sensitive to calcium chloride. Compared with the traditional dyeingmethod, three reactive anthraquinone dyes achieved better building up property and color yields by using calcium chloride atpH value of 7.0. Calcium chloride had obvious dyeing acceleration for polyamide 66. The anthraquinone dye withbifunctional groups could achieve higher exhaustion and excellent fastness on polyamide 66. The mechanism of calciumchloride to exert an influence on dyeing property of polyamide 66 was analyzed. This work is of great significance forimproving dyeing performance of reactive dyes on polyamide fiber.

Impact of electrolyte additives (alkali metal salts) on the capacitive behavior of NiO-based capacitors

Yong Zhang,Lizhen Wang,Aiqin Zhang,Yanhua Song,Xiaofeng Li,Xingbing Wu,Peipei Du,Lv Yan 한국화학공학회 2011 Korean Journal of Chemical Engineering Vol.28 No.2

To improve the specific capacitance and energy density of electrochemical capacitor, nanostructured NiO was prepared by high temperature solid-state method as electrode material. The crystal structure and morphology of as-parepared NiO samples were investigated by X-ray diffraction (XRD) and scanning electron microscopy (SEM). Cyclic voltammetry (CV) measurement was applied to investigate the specific capacitance of the NiO electrode. Furthermore,a novel mixed electrolyte consisting of NaOH, KOH, LiOH and Li_2CO_3 was prepared for the NiO capacitor,and the component and concentration of the four different electrolytes was examined by orthogonal test. The results showed that the NiO sample has cubic structure with nano-size particles, and the optimal composition of the electrolyte was: NaOH 2 mol L^(−1), KOH 3 mol L^(−1), LiOH 0.05 mol L^(−1), and Li_2CO_3 0.05 mol L^−1. At a scan rate of 10 mV s^(−1), the fabricated capacitor exhibits excellent electrochemical capacitive performance, while the specific capacitance and the energy density were 239 F g^(−1) and 85 Wh kg^(−1), which was higher than one-component electrolyte.

Bandwidth Scheduling for Big Data Transfer with Two Variable Node-Disjoint Paths

Aiqin Hou,Chase Qishi Wu,Liudong Zuo,Xiaoyang Zhang,Tao Wang,Dingyi Fang 한국통신학회 2020 Journal of communications and networks Vol.22 No.2

Many large-scale applications in broad science, engineering,and business domains are generating big data, which must betransferred to remote sites for various storage and analysis purposes. Bandwidth reservation services that discover feasible routingoptions over dedicated paths in high-performance networkshave proved to be effective for such big data transfer. In thispaper, we formulate a generic problem of bandwidth schedulingwith two variable node-disjoint paths (BS-2VNDP) by exploringthe flexibility and capacity of multiple data transfer paths. We furtherconsider two variable paths of either fixed or variable bandwidthwith negligible or non-negligible path switching delay, referredto as 2VPFB-0/1 and 2VPVB-0/1, respectively.We prove thatall of these four scheduling problems are NP-complete, and thenpropose a heuristic algorithm for each. For performance comparison,we also design several other heuristic algorithms based on agreedy strategy. These scheduling algorithms are implemented andtested in both simulated and real-life networks, and extensive resultsshow that the proposed heuristic algorithms significantly outperformother algorithms in comparison.

Single-cell analysis of salt-induced hypertensive mouse aortae reveals cellular heterogeneity and state changes

Zhang Ka,Kan Hao,Mao Aiqin,Geng Li,Ma Xin 생화학분자생물학회 2021 Experimental and molecular medicine Vol.53 No.-

Elevated blood pressure caused by excessive salt intake is common and associated with cardiovascular diseases in most countries. However, the composition and responses of vascular cells in the progression of hypertension have not been systematically described. We performed single-cell RNA sequencing on the aortic arch from C57BL/6J mice fed a chow/high-salt diet. We identified 19 distinct cell populations representing 12 lineages, including smooth muscle cells (SMCs), fibroblasts, endothelial cells (ECs), B cells, and T cells. During the progression of hypertension, the proportion of three SMC subpopulations, two EC subpopulations, and T cells increased. In two EC clusters, the expression of reactive oxygen species-related enzymes, collagen and contractility genes was upregulated. Gene set enrichment analysis showed that three SMC subsets underwent endothelial-to-mesenchymal transition. We also constructed intercellular networks and found more frequent cell communication among aortic cells in hypertension and that some signaling pathways were activated during hypertension. Finally, joint public genome-wide association study data and our single-cell RNA-sequencing data showed the expression of hypertension susceptibility genes in ECs, SMCs, and fibroblasts and revealed 21 genes involved in the initiation and development of high-salt-induced hypertension. In conclusion, our data illustrate the transcriptional landscape of vascular cells in the aorta associated with hypertension and reveal dramatic changes in cell composition and intercellular communication during the progression of hypertension.

Single-cell transcriptome analysis reveals cellular heterogeneity in the ascending aortas of normal and high-fat diet-fed mice

Kan Hao,Zhang Ka,Mao Aiqin,Geng Li,Gao Mengru,Feng Lei,You Qingjun,Ma Xin 생화학분자생물학회 2021 Experimental and molecular medicine Vol.53 No.-

The aorta contains numerous cell types that contribute to vascular inflammation and thus the progression of aortic diseases. However, the heterogeneity and cellular composition of the ascending aorta in the setting of a high-fat diet (HFD) have not been fully assessed. We performed single-cell RNA sequencing on ascending aortas from mice fed a normal diet and mice fed a HFD. Unsupervised cluster analysis of the transcriptional profiles from 24,001 aortic cells identified 27 clusters representing 10 cell types: endothelial cells (ECs), fibroblasts, vascular smooth muscle cells (SMCs), immune cells (B cells, T cells, macrophages, and dendritic cells), mesothelial cells, pericytes, and neural cells. After HFD intake, subpopulations of endothelial cells with lipid transport and angiogenesis capacity and extensive expression of contractile genes were defined. In the HFD group, three major SMC subpopulations showed increased expression of extracellular matrix-degradation genes, and a synthetic SMC subcluster was proportionally increased. This increase was accompanied by upregulation of proinflammatory genes. Under HFD conditions, aortic-resident macrophage numbers were increased, and blood-derived macrophages showed the strongest expression of proinflammatory cytokines. Our study elucidates the nature and range of the cellular composition of the ascending aorta and increases understanding of the development and progression of aortic inflammatory disease.

Prevalence of Hymenolepis nana and H. diminuta from Brown Rats (Rattus norvegicus) in Heilongjiang Province, China

Di Yang,Wei Zhao,Yichi Zhang,Aiqin Liu 대한기생충학열대의학회 2017 The Korean Journal of Parasitology Vol.55 No.3

A glassy carbon electrode modified with a composite consisting of electrodeposited chitosan and carboxylated multi‑walled carbon nanotubes for simultaneous voltammetric determination of dopamine, serotonin and melatonin

Shanshan Tang,Axin Liang,Miao Liu,Wei Wang,Fulai Zhang,Aiqin Luo 한국탄소학회 2023 Carbon Letters Vol.33 No.7

A glassy carbon electrode modified with a composite consisting of electrodeposited chitosan and carboxylated multi-walled carbon nanotubes (e-CS/MWCNTs/GCE) was used as a working electrode for simultaneous determination of dopamine (DA), serotonin (5-HT) and melatonin (MT), which were related to circadian rhythms. The electrochemical characterizations of the working electrode were carried out via electrochemical impedance spectroscopy and chronocoulometry. It was found that electrochemical modification method, that was cyclic voltammetry, may can cause continuous CS polymerization on MWCNTs surface to form a dense membrane with more active sites on the electrode, and the electrochemically active surface area of e-CS/MWCNTs/GCE obtained was about 7 times that of GCE. The electrochemical behaviour of DA, 5-HT and MT on working electrode were carried out via differential pulse voltammetry and cyclic voltammetry. The results showed that e-CS/MWCNTs/GCE solved the problem that the bare electrode could not detect three substances simultaneously, and can catalyze oxidation potential difference as low as 0.17 V of two substances reaction at the same time, indicating very good electrocatalytic activity. By optimizing the detection conditions, the sensor showed a good linear response to DA, 5-HT and MT in the range of 20-1000 μmol/L, 9-1000 μmol/L and 20-1000 μmol/L, and the detection limits were 12 μmol/L, 10 μmol/L and 22 μmol/L (S/N = 3), respectively. In addition, the proposed sensor was successfully applied to the simultaneous detection of DA, 5-HT and MT in human saliva samples.

Oxidation Behavior of CoCrFeMnNi High-Entropy Alloy Fabricated by Selective Laser Melting

Xiquan Jia,Zhenlin Xu,Yizhu He,Shengxuan Zhou,Xiaojie Du,Hui Zhang,Aiqin Mao 대한금속·재료학회 2023 METALS AND MATERIALS International Vol.29 No.10

The present study investigated the microstructure and oxidation behavior of the CoCrFeMnNi high-entropy alloy (HEA) prepared by selective laser melting (SLM). The microstructure of the as-built sample comprised layer-by-layer overlapping melt pools, columnar grains, and cellular structures. The melt pool boundaries (MPBs) and cellular structures disappeared, and the dislocation density decreased after annealing at 900 °C. The high-temperature oxidation behavior of the CoCrFeMnNi HEA was investigated via oxidation kinetics, morphology observation, and oxidation product analysis. The oxidation kinetics followed the parabolic law at 800 to 1000 ℃. There were three layers of oxide scale at all temperatures. At 800 to 1000 °C, the inner oxide layer was Cr2O3; the intermediate layer consisted of Cr-oxides and Mn-oxides. The outer oxide layer mainly consisted of Mn2O3 at 800 to 900 °C and Mn3O4 at 1000 °C. At 1000 °C, the fast diffusion channels provided by MPBs led to preferential oxidation in the as-built HEA. And the preferential oxidation behavior in the annealed HEA was inhibited due to the removal of MPBs by annealing. At each temperature, the annealed HEA showed relatively better oxidation resistance than the as-built sample.