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pH调节的纳米平行通道中Powell⁃Eyring流体的电渗流动

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应用数学和力学 2025年第1期46卷 72-83页

作者：长龙布仁满都拉娜仁孙艳军菅永军内蒙古财经大学统计与数学学院呼和浩特010070 内蒙古师范大学数学科学学院呼和浩特010022 东华大学数学与统计学院上海201620 东华大学非线性科学研究所上海201620

在调节溶液pH值和盐浓度下,利用同伦摄动法求解了纳米平行通道内Powell-Eyring流体的电渗流动(electroosmotic flow,EOF),得到了近似解.通过Chebyshev谱配置法验证了所得的近似解的准确性.在此基础上,研究了无量纲压力梯度G,盐浓度M_(K... 详细信息

在调节溶液pH值和盐浓度下,利用同伦摄动法求解了纳米平行通道内Powell-Eyring流体的电渗流动(electroosmotic flow,EOF),得到了近似解.通过Chebyshev谱配置法验证了所得的近似解的准确性.在此基础上,研究了无量纲压力梯度G,盐浓度M_(KCI)和pH值,Powell-Eyring流体和Newton流体的黏度之比γ对速度剖面u和体积流率(平均速度)Q的影响.结果表明,同伦摄动法的收敛速度较快,仅需展开到一阶解就与数值解完全吻合;同时,M_(KCI),pH,γ和G对纳米通道中的电荷密度和Powell-Eyring流体电渗流速度具有显著影响.

关键词： pH调节 Powell⁃Eyring流体电渗流动官能团

Effects of scandium chloride on osteogenic and adipogenic differentiation of mesenchymal stem cells

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Journal of Rare Earths 2022年第1期40卷 161-168页

作者： na ren Xin Yu Aizhu Wang na Liang Zhichao Feng Chunhui Sun Collaborative Innovation Center of Technology and Equipment for Biological Diagnosis and Therapy in Universities of Shandong Institute for Advanced Interdisciplinary Research(iAIR)University of JinanJinan 250022China School of Biological Science and Technology University of JinanJinan 250022China

Mesenchymal stem cells(MSCs)are multi-potent cells that are able to differentiate and mature into various types of cells under a certain microenvironment for cell therapy and tissue ***(Sc),an important rare earth element,recently has been intensively investigated in biomedical fields as well as industrial engineering,and chloride channels have been proven to be able to affect osteogenic ***,it is significant to investigate effects of ScCl_(3)on cell activities of *** this paper,rat bone MSCs(rBMSCs)were co-cultured with various concentrations of ScCl_(3)(1×10^(-8),1×10^(-6),and 1×10^(-4)mol/L)to evaluate their influence on cell proliferation as well as osteogenic and adipogenic differentiation in *** results indicate that ScCl_(3)promotes the proliferation of rBMSCs initially,which is yet reduced upon ion *** used immunofluorescence staining,quantitative real time polymerase chain reactions,and assays measuring alkaline phosphatase activity,mineralized deposits,and intracytoplasmic lipids to reveal that rBMSCs treated with ScCl_(3)at concentrations of 1×10^(-8)-1×10^(-6)mol/L can enhance levels of osteogenic differentiation in a dosedependent manner and reduce adipogenic differentiation to a certain degree through Wnt/β-catenin signaling *** results indicate that appropriate concentrations of ScCl_(3)can improve osteogenic differentiation in the lineage commitment of rBMSCs,and thus,promote bone *** study implies that ScCl_(3) possesses great potentials in the treatment of bone diseases and would provide new strategy of designing composites by SiCl3 doping for biomedical applications in the future.

关键词： Scandium Mesenchymal stem cells Osteogenic differentiation Adipogenic differentiation Dose-dependent effects Wnt/3-catenin signaling pathway

A new algorithm based on C-V characteristics to extract the epitaxy layer parameters for power devices with the consideration of termination

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Chinese Physics B 2021年第4期30卷 616-628页

作者： Jiupeng Wu na ren Kuang Sheng College of Electrical Engineering Zhejiang UniversityHangzhou 310027China Hangzhou Innovation Center Zhejiang UniversityHangzhou 311200China

Doping concentration and thickness of an epitaxy layer are the most essential parameters for power *** conventional algorithm extracts these two parameters by calculating the doping profile from its capacitance-voltage(C-V)*** an algorithm treats the device as a parallel-plane junction and ignores the influence of the *** epitaxy layer doping concentration tends to be overestimated and the thickness *** order to obtain the epitaxy layer parameters with higher accuracy,a new algorithm applicable for devices with field limited ring(FLR)terminations is proposed in this *** new algorithm is also based on the C-V characteristics and considers the extension manner of the depletion region under the FLR *** an extension manner depends on the design parameters of the FLR termination and is studied in detail by simulation and *** analytical expressions of the device C-V characteristics and the effective doping profile are *** accurate epitaxy layer parameters can be extracted by fitting the effective doping profile expression to the C-V doping profile calculated from the C-V *** relationship between the horizontal extension width and the vertical depth of the depletion region is also *** credibility of the new algorithm is verified by *** applicability of our new algorithm to FLR/field plate combining terminations is also *** new algorithm acts as a powerful tool for analyses and improvements of power devices.

关键词： C-V characteristics doping concentration epitaxy layer thickness field limited ring termination

Enhanced degradation of refractory organics in ORR-EO system with a blue TiO_(2)nanotube array modified Ti-based Ni-Sb co-doped SnO_(2)anode

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Chinese Chemical Letters 2024年第8期35卷 391-395页

作者： Yifen He Chao Qu na ren Dawei Liang Department of Materials Chemistry School of Materials Science&EngineeringBeihang UniversityBeijing 102206China Department of Environmental Science Faculty of Environment&LifeBeijing University of TechnologyBeijing 100124China

Recently,a novel 2-electron oxygen reduction reaction(ORR)based electro-oxidation(EO)system was developed,which utilizes a H_(2)O_(2)generation cathode instead of H_(2)evolution cathode.A Ti-based Ni-Sb co-doped SnO_(2)(Ti/naTO)anode was selected for efficient degradation of refractory organics and O_(3)*** synergistic reaction of O3/H_(2)O_(2)further accelerated the generation of hydroxyl radicals(·OH)in the ORR-EO ***,the catalytic activity and long-term effectiveness of the Ti/naTO anode limited the large-scale application of the ORR-EO *** this study,a blue TiO_(2)nanotube array(blue-TiO_(2)-NTA)inter-layer was introduced into the fabrication process between the Ti substrate and naTO catalyst *** to the Ti/naTO anode,the Ti/blue-TiO_(2)-NTA/naTO anode achieved higher efficiency of organic removal and O_(3)***,the accelerated lifetime of the Ti/blue-TiO_(2)-NTA/naTO anode was increased by 7 times compared to the Ti/naTO *** combined with CNTs-C/PTFE air cathode in ORR-EO system,all anodic oxidation and O_(3)/H_(2)O_(2)processes achieved higher•OH *** 92%of TOC in leachate bio-effluent was effectively eliminated with a relatively low energy cost of 45 kWh/t.

关键词： Electro-oxidation Blue TiO_(2)nanotube array O_(3)/H_(2)O_(2)process Refractory organics Leachate bio-effluent

习惯形成对农民工食物消费影响的实证分析:基于社会分层视角

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中国食物与营养 2025年第1期31卷 55-62页

作者：刘华任娜张凯旋王琳南京农业大学经济管理学院南京210095 南京晓庄学院新闻传播学院南京211171

目的:利用南京市外来务工人员调研数据,实证分析习惯形成对农民工各类食物消费的影响,并基于社会分层的视角,深入考察社会不同类别农民工各类食物消费的内外部习惯形成效应,进而识别习惯形成对农民工消费的综合影响。方法:在引入滞后一... 详细信息

目的:利用南京市外来务工人员调研数据,实证分析习惯形成对农民工各类食物消费的影响,并基于社会分层的视角,深入考察社会不同类别农民工各类食物消费的内外部习惯形成效应,进而识别习惯形成对农民工消费的综合影响。方法:在引入滞后一期消费支出的基础上,创新性引入童年时期消费习惯、进城前消费习惯作为代理变量,识别不同时期内部习惯的影响,同时引入农民工食物消费是否受到周围人的影响这一变量,识别外部习惯表现出的示范作用。结果:当引入滞后一期消费时,农民工食物消费支出表现出强内部习惯形成特征,且更多地体现在第二类、第三类农民工群体中;当引入童年时期和进城前消费习惯时,肉、蛋、奶、水果消费支出均表现出强内部习惯形成特征。第二类农民工的食物消费受到外部习惯影响是显著的,重点表现在奶和水果类消费;第一类农民工受外部习惯影响较小,第三类农民工食物消费与外部环境关系并不显著。结论:关注习惯形成和社会分层对农民工食物消费的影响,有助于针对性优化食物消费结构,为深化农业供给侧改革提供需求层面的科学指导。

关键词：食物消费农民工内部习惯外部习惯社会分层

A novel spectrophotometric determination of copper(Ⅱ) with bromosulphonazoⅢ

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Chinese Chemical Letters 2008年第1期19卷 92-94页

作者： Li Yuan Shu Hui Huo Xiao na ren Hui Chen Chemistry ＆ Chemical Engineering College Northwest Normal University Lanzhou 730070 China

A novel chromogenic reaction involving copper（Ⅱ） and bromosulphonazo Ⅲ （Br-SAZⅢ） in hexamethylenetetramine- hydrochloric buffer solution was investigated. The results showed that a blue complex of copper（Ⅱ） and bromosulphonazo Ⅲ was formed with a molar ratio of 1：1. The apparent molar absorptivity was 3.3×10^5Lmol-1cm-1 and the maximum absorption peak was at 616.8 nm. The proposed procedure was used for quantitative estimation of Cu（II） in the concentration range of 0-1.024μg/mL with the detection limit （3σ） of 7.03 × 10^-4 μg/mL （n = 20）. The relative standard deviations （RSDs） were 0.56-4.68%. Under the optimized conditions, total copper in the vegetables and tea was successfully determined. 2007 Li Yuan. Published by Elsevier B.V. on behalf of Chinese Chemical Society. All rights reserved.

关键词： Spectrophotometry Bromosulphonazo Ⅲ Copper(Ⅱ) Vegetable Tea

Synthesis and Characterization of pH-Responsive Block Copolymers with Primary Amine Groups

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Chemical Research in Chinese Universities 2013年第2期29卷 389-395页

作者： WANG Hong ZHU Yue-jun ren Xiao-na ZHANG Hong TAN Ye-bang Key Laboratory of Special Functional Aggregated Materials Ministry of Education School of Chemistry and Chemical Engineering Shandong University Jinan 250100 P. R. China State Key Laboratory of Offshore Oil Exploitation Technology Research Department of Research Center China National Offshore Oil Corporation Beijing 100027 P R. China

A new pH-responsive block copolymer, methoxy poly（ethylene glycol）-b-poly[5-methacrylamido- pentylamine hydrochloride]（mPEG-b-PMAAPA） was synthesized and characterized in this paper. The monomer 5-methacrylamido-pentylamine hydrochloride（MAAPA） and the macroinitiator（mPEG-ACVA） were synthesized, re- spectively, and mPEG-b-PMAAPA was then obtained by free radical polymerization. The structure and molecular weight of mPEG-b-PMAAPA were cont]rmed by hydrogen nuclear magnetic resonance（~H NMR） spectroscopy and gel permeation chromatography with multiangle laser light scattering（GPC-MALLS） measurements. At a low pH, it is hydrophilic due to the protonation of the primary amine groups. With increasing pH value, deprotonation occurs and the hydrophobicity of PMAAPA block increases. This molecular feature leads to interesting aggregation behavior of mPEG-b-PMAAPA in aqueous solutions at different pH values as revealed by dynamic light scattering（DLS） measurements, transmission electron microscopy（TEM） observations and resonance light scattering（RLS） measure- ments.

关键词： Block copolymer Polyamine pH-Responsive Water soluble copolymer

Pair Production in an Intense Laser Pulse: The Effect of Pulse Length

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Chinese Physics Letters 2012年第7期29卷 47-50页

作者： ren na WANG Jia-Xiang LI An-Kang WANG Ping-Xiao State Key Laboratory of Precision Spectroscopy East China Normal UniversityShanghai 200062 Key Laboratory of Applied Ion Beam Physics Laboratory(Ministry of Education)and Institute of Modern Physics Department of Nuclear Science and TechnologyFudan UniversityShanghai 200433

Production of positron-electron (e^(+) e^(-) ) pairs in an intense laser pulse is investigated by solving the Dirac equation with analytical and numerical *** observe that the probability of the pair production will firstly decrease slowly as the pulse length T becomes *** it will increase until T is reduced to the Compton time Tc =(h)/(mec) ≈ 1.29 × 10^(-21)s and finally decrease exponentially to ***,for a prominent pair production,we not only require that the electric field strength should be higher than the Schwinger critical value Ecr =m^(2)c^(3)/(e(h)) ≈ 1.32 × 10^(16) V/cm,but also that the pulse duration T should be larger than *** latter is shown to be related to momentum requirement for the *** fields with different pulse lengths,the phase and chirp influences upon the pair production are also explored.

关键词： transition Pulse slowly

Full filling of mesoporous carbon nanotubes by aqueous solution at room temperature

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Chinese Physics B 2019年第3期28卷 304-308页

作者： Xiao-na ren Min Xia Qing-Zhi Yan Chang-Chun Ge School of Materials Science and Technology University of Science and Technology Beijing

Carbon nanotubes(CNTs) have the ideal structure to be used as templates for nanomaterials, especially for nanowires,and the tungsten nanowire is an important nanomaterial that is used as a strengthening phase. Therefore, we have proposed to apply mesoporous CNT(mCNT) as a template to prepare tungsten nanowires. However, the tungsten precursor should fill the hollow tube of mCNT firstly, and very few related studies have been reported. In this paper, we have systematically studied the filling process of ammonium metatungstate(AMT) aqueous solution. The results reveal that owing to the mesopores in the mCNT sidewall, the AMT can be encapsulated into the tube at room temperature(RT) and we can fully fill it without destroying the structure. In addition, vibration and solute concentration are also important factors. Besides,the mesoporous sidewall and hollow tubular core structure of mCNT are prerequisites to realize full filling. Furthermore,tungsten nanowires have been obtained after reduction of AMT in mCNTs.

关键词： mesoporous carbon nanotube(mCNT) capillarity aqueous solution tungsten nanowire