Synthesis of acrylic-lignosulfonate resin for crystal violet removal from aqueous solution

Wenjing Xu,Wensheng Zhang,Yan Li,Wei Li 한국화학공학회 2016 Korean Journal of Chemical Engineering Vol.33 No.9

A new acrylic-lignosulfonate resin (ALR) was obtained by radical polymerization using calcium lignosulfonate (LS-Ca) and acrylic acid (AA) as raw materials. ALR was characterized using FT-IR, SEM, TG-DSC and N2 adsorption–desorption surface area and pore size analyzer. Batch adsorption, including initial concentration, time, pH, dosage and temperature on the adsorption of crystal violet (CV) by ALR, was systematically studied. The ALR contained porous structure and the specific surface area of ALR was 190.55m2/g with average pore diameter 11.34 nm. The kinetic and equilibrium data fitted into the pseudo-second-order model and Freundlich isotherm model, respectively. The adsorption process was slightly influenced in the range of pH=3-12. The maximum adsorption capacity of CV was found to be as high as 150.40±4.80mg/g for 24 h at 25 oC. Thermodynamic parameters were evaluated, and their values indicated that adsorption of CV on ALR was an exothermic process and spontaneous.

Study of SO2 oxidation over V2O5/activated carbon catalyst using in situ diffuse reflectance infrared Fourier transformation spectroscopy

Wenjing Xu,Zhanggen Huang,Qianqian Guo,Yaqin Hou,Xiaojin Han 한국화학공학회 2014 Korean Journal of Chemical Engineering Vol.31 No.5

The SO2 oxidation over V2O5/AC catalyst was studied using an in situ diffuse reflectance infrared Fouriertransformation spectroscopy technique at 120 oC. Results reveal that the surface oxygen groups could neither act asactive sites for SO2 oxidation nor supply the oxygen needed for VV↔VIV redox cycle. The vanadia species and gasphase oxygen are essential for SO2 oxidation. During SO2 oxidation over V2O5/AC, the surface hydroxyl groups involvein the formation of sulfate species. The role of water vapor in flue gas might be to supplement the hydroxyl groupsconsumed so that the SO2 oxidation could continue.

Molecular Mechanism and Regulation of Carotenoid Biosynthesis in Citrus sinensis

Qiang Xu,Xiuxin Deng,Qing Liu,Jiancheng Zhang,Nengguo Tao,Wenjing Zhou,Zhiyong Pan,Juan Xu 한국원예학회 2008 한국원예학회 기타간행물 Vol.- No.-

Axial Stress Analysis and Comparison of the Novel Dual 3-phase Axial Flux Permanent Magnet Machines

Wenjing Zhang,Ngac Ky Nguyen,Eric Semail,Yanliang Xu 전력전자학회 2023 ICPE(ISPE)논문집 Vol.2023 No.-

In previous research, a novel three-phase dual-stator axial flux permanent magnet machine characterized by the advantages of compact structure and low moment of inertia is proposed for industrial robot application. In order to improve its functional reliability furtherly, the dual three-phase axial flux permanent magnet machine (DTP-AFPM) is firstly proposed. Benefiting from the combination of 12 slots/10 poles, the coil configuration of one stator disk can be modified to a dual three phase full-pitch winding straightforwardly, as a result, one kind of the DTP-AFPMs is achieved which is named as the no shift model in this paper. For eliminating the coil reconfiguration on each stator disk and the connection of the coils belonging to the same phase between two stator disks, the shift model which is based on the shift of the two stator disks to obtain the phasor difference between two three-phase windings is introduced. The characteristics and electromagnetic performances of these two models are analyzed and compared. However, it should be noted that the light-weight disk-type rotor of DTP-AFPMs also degrade the strength of the rotor. The proposed DTPAFPMs are more sensitive to the axial stress on the rotor which introduces not only the vibration and noise but also the deformation or even the damage of the rotor. Thus, the axial stress on the rotor is investigated and treated as a critical evaluation indicator. The axial stress is analyzed under both healthy and fault conditions and its distribution on the rotor is given on a 2-D plane.

Discovery and validation of PURA as a transcription target of 20(S)-protopanaxadiol: Implications for the treatment of cognitive dysfunction

Feiyan Chen,Wenjing Zhang,Shuyi Xu,Hantao Zhang,Lin Chen,Cuihua Chen,Zhu Zhu,Yunan Zhao 고려인삼학회 2023 Journal of Ginseng Research Vol.47 No.5

Background: 20(S)-protopanaxadiol (PPD), a ginsenoside metabolite, has prominent benefits for thecentral nervous system, especially in improving learning and memory. However, its transcriptionaltargets in brain tissue remain unknown. Methods: In this study, we first used mass spectrometry-based drug affinity responsive target stability(DARTS) to identify the potential proteins of ginsenosides and intersected them with the transcriptionfactor library. Second, the transcription factor PURA was confirmed as a target of PPD by biolayerinterferometry (BLI) and molecular docking. Next, the effect of PPD on the transcriptional levels of targetgenes of PURA in brain tissues was determined by qRT-PCR. Finally, bioinformatics analysis was used toanalyze the potential biological features of these target proteins. Results: The results showed three overlapping transcription factors between the proteomics of DARTSand transcription factor library. BLI analysis further showed that PPD had a higher direct interaction withPURA than parent ginsenosides. Subsequently, BLI kinetic analysis, molecular docking, and mutations inkey amino acids of PURA indicated that PPD specifically bound to PURA. The results of qRT-PCR showedthat PPD could increase the transcription levels of PURA target genes in brain. Finally, bioinformaticsanalysis showed that these target proteins were involved in learning and memory function. Conclusion: The above-mentioned findings indicate that PURA is a transcription target of PPD in brain,and PPD upregulate the transcription levels of target genes related to cognitive dysfunction by bindingPURA, which could provide a chemical and biological basis for the study of treating cognitive impairmentby targeting PURA.

Cosmogenic nuclides (10Be and 26Al) erosion rate constraints in the Badain Jaran Desert, northwest China: implications for surface erosion mechanisms and landform evolution

Tong Zhao,Wenjing Liu,Zhifang Xu,Taoze Liu,Sheng Xu,Lifeng Cui,Chao Shi 한국지질과학협의회 2019 Geosciences Journal Vol.23 No.1

Both tectonics and climate affect surface erosion and change the landform. Long-term surface erosion rates determined by in situ produced cosmogenic nuclides are useful quantitative constraints for landform evolution in geological time scale. Measurements of cosmogenic 10Be and 26Al in the granitic rocks exposed in the Badain Jaran Desert, give a mean erosion rate of 7.3 ± 2.6 m/Ma, which is an order of magnitude higher than those reported in other extremely arid regions. Tectonic activity is supposed to be the first order control on regional erosion rate by comparing the 10Be erosion rates of arid regions with different precipitation ranges and tectonic activities worldwide. However the higher erosion rates in the Badain Jaran Desert compared with other arid regions within the stable tectonic background were attributed to the wind erosion and periodically warmer and wetter climate since late Pleistocene. Besides, the estimated eroded mass flux of 7.8 × 104 t/y suggests that erosion products of bedrocks in the Badian Jaran Desert only contribute minor desert deposits, which indicates massive exogenous materials input to the desert.

Long Non-Coding RNA TUG1 Attenuates Insulin Resistance in Mice with Gestational Diabetes Mellitus via Regulation of the MicroRNA-328-3p/SREBP-2/ERK Axis

Xuwen Tang,Qingxin Qin,Wenjing Xu,Xuezhen Zhang 대한당뇨병학회 2023 Diabetes and Metabolism Journal Vol.47 No.2

Background: Long non-coding RNAs (lncRNAs) have been illustrated to contribute to the development of gestational diabetes mellitus (GDM). In the present study, we aimed to elucidate how lncRNA taurine upregulated gene 1 (TUG1) influences insulin resistance (IR) in a high-fat diet (HFD)-induced mouse model of GDM.Methods: We initially developed a mouse model of HFD-induced GDM, from which islet tissues were collected for RNA and protein extraction. Interactions among lncRNA TUG1/microRNA (miR)-328-3p/sterol regulatory element binding protein 2 (SREBP-2) were assessed by dual-luciferase reporter assay. Fasting blood glucose (FBG), fasting insulin (FINS), homeostasis model assessment of insulin resistance (HOMA-IR), HOMA pancreatic β-cell function (HOMA-β), insulin sensitivity index for oral glucose tolerance tests (ISOGTT) and insulinogenic index (IGI) levels in mouse serum were measured through conducting gain- and loss-of-function experiments.Results: Abundant expression of miR-328 and deficient expression of lncRNA TUG1 and SREBP-2 were characterized in the islet tissues of mice with HFD-induced GDM. LncRNA TUG1 competitively bound to miR-328-3p, which specifically targeted SREBP-2. Either depletion of miR-328-3p or restoration of lncRNA TUG1 and SREBP-2 reduced the FBG, FINS, HOMA-β, and HOMA-IR levels while increasing ISOGTT and IGI levels, promoting the expression of the extracellular signal-regulated kinase (ERK) signaling pathway-related genes, and inhibiting apoptosis of islet cells in GDM mice. Upregulation miR-328-3p reversed the alleviative effects of SREBP-2 and lncRNA TUG1 on IR.Conclusion: Our study provides evidence that the lncRNA TUG1 may prevent IR following GDM through competitively binding to miR-328-3p and promoting the SREBP-2-mediated ERK signaling pathway inactivation.

Regional Economic Evaluation Based on a Novel Fuzzy Clustering Method in Big data

Liu Zhaohui,Li Liyan,Xu Wenjing 보안공학연구지원센터 2014 International Journal of Database Theory and Appli Vol.7 No.3

Volume Compatibility of Interlayer Treatment Materials with Roller-Compacted Concrete

Xiaoliang Zhu,Yuxin Gao,Wenjing Song,Jingjing Xu,Chengyang Li,Zhaoheng Guo,Fang Chen,Rui Zhang 대한토목학회 2022 KSCE Journal of Civil Engineering Vol.26 No.3

Interlayer is the weakest plane of the entire roller-compacted concrete (RCC) structure and is easily deteriorated under the pressure of water and other environmental factors. Shearing force induced by the different shrinkage in interlayer part is the main reason for that poor performance of the RCC. In this paper, the deformation of RCC concrete and interlayer treatment mortar with supplementary cementitious materials (SCMs, including fly ash and silica fume) and double expansive resources admixtures (HME, containing calcium sulphoaluminate (CSA) and CaO) were studied. Deformation of concrete (produced RCC) and interlayer treatment materials was modeled and compared. Porosity characters of interlayer treatment materials and water absorption of interlayer-treated RCC samples were tested. Results showed that the HME significantly reduced the shrinkage of mortar and the deformation difference degree between layers was shortened. Modified interlayer treatment materials with HME could modify the macroscopic properties of RCC, the low porosity of interlayer and water absorption of interlayer-treated RCC was resulted. The suitable HME content is necessary in interlayer treatment materials and which could improve the performance of RCC.

Facile Synthesis of MoS2 Hierarchical Nanostructures as Electrodes for Capacitor with Enhanced Pseudocapacitive Property

Shiting Luo,Limei Xu,Jinshan Li,Wenjing Yang,Minli Liu,Lin Ma 성균관대학교(자연과학캠퍼스) 성균나노과학기술원 2020 NANO Vol.15 No.02

In this work, the 3D porous hierarchical MoS2 nanostructures were prepared via a simple hydrothermal deposition method only utilizing titanium (Ti) mesh as a substrate. The as-synthesized uniform MoS2 flower-like nanostructures were assembled by nanosheets composed of several stacking layers. The curved and rough surface of cylindrical Ti wire was beneficial to assembly of MoS2 nanosheets into hierarchical architectures. Moreover, the electrochemical performance of the as-prepared MoS2 nanostructured electrodes for capacitors was also investigated. The structural advantages lead to a remarkably improved pseudocapacitive property including high capacitance and durable cycling ability.