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Separation of methyl linolenate and its analogues by functional mixture of imidazolium based ionic liquid-organic solvent-cuprous salt

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Chinese Journal of Chemical Engineering 2019年第4期27卷 811-817页

作者： Xianghong Lu Jiajian zhu xing Qian Jianbing Ji Zhejiang Provincial Key Laboratory of Biofuel College of Chemical EngineeringZhejiang University of Technology

Methyl linolenate was separated from its analogues by a new extraction system constructed by solvent,imidazolium based ionic liquids and cuprous salt. Firstly, the effect of ionic liquid on the dissolution of CuCl in acetonitrile, N,N-dimethylformamide(DMF), methanol and water was evaluated by visual observation.[C4Mim][Cl]can improve the dissolution of CuCl in acetonitrile. Then, for the new system as acetonitrile-ILs-CuCl, extraction equilibrium, distribution ratio and selectivity of methyl linolenate and its analogues were determined by gas chromatography analysis and the mass balance. The extraction time, IL structures and CuCl concentrations were investigated. Distribution ratio decreased slightly, but selectivity increased significantly with the addition of CuCl,[C4Mim][Cl] or [C4Vim][NTF2] into acetonitrile.[C4Vim][NTF2] had higher selectivity than [C4Mim][Cl].But the selectivity of the system combining CuCl with [C4Vim][NTF2] was much lower than with [C4 Mim][Cl].For the CuCl-[C4Mim][Cl]-acetonitrile, the extraction efficiency was better than CuCl-acetonitrile, increasing Cu^+ concentration effectively improved the separation selectivity when ratio of CuCl/[C4Mim][Cl] was less than 1. Compared with previous aqueous AgNO3 extractions, the method of using CuCl is a much cheaper and practical way to enrich unsaturated fatty acid.

关键词： Methyl linolenate Cuprous salt Ionic liquid Cosolvent Extraction

Tunable dynamical magnetoelectric effect in antiferromagnetic topological insulator MnBi_(2)Te_(4) films

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npj Computational Materials 2021年第1期7卷 1101-1106页

作者： Tongshuai zhu Huaiqiang Wang Haijun Zhang Dingyu xing National Laboratory of Solid State Microstructures School of PhysicsNanjing UniversityNanjingChina Department of Physics University of ZurichZurichSwitzerland Collaborative Innovation Center of Advanced Microstructures Nanjing UniversityNanjingChina

Axion was postulated as an elementary particle to solve the strong charge conjugation and parity puzzle,and later axion was also considered to be a possible component of dark matter in the ***,the existence of axions in nature has not been ***,axions arise out of pseudoscalar fields derived from the Chern–Simons theory in condensed matter *** antiferromagnetic insulators,the axion field can become dynamical due to spin-wave excitations and exhibits rich exotic phenomena,such as axion ***,antiferromagnetic dynamical axion insulator has yet been experimentally identified in realistic *** recently,MnBi_(2)Te_(4)was discovered to be an antiferromagnetic topological insulator with a quantized static axion field protected by inversion symmetry P and magnetic-crystalline symmetry ***,we studied MnBi_(2)Te_(4)films in which both the P and S symmetries are spontaneously broken and found that substantially enhanced dynamical magnetoelectric effects could be realized through tuning the thickness of MnBi_(2)Te_(4)films,temperature,or element *** results show that thin films of MnBi_(2)Te_(4)and related compounds could provide a promising material platform to experimentally study axion electrodynamics.

关键词： materials dynamical insulator

Production of ammonia from plasma-catalytic decomposition of urea: Effects of carrier gas composition

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Journal of Environmental Sciences 2018年第4期30卷 94-103页

作者： xing Fan Jian Li Danqi Qiu Tianle zhu Key Laboratory of Beijing on Regional Air Pollution Control College of Environmental and Energy EngineeringBeijing University of Technology School of Space and Environment Beihang University

Effects of carrier gas composition（N2/air） on NH3 production, energy efficiency regarding NH3 production and byproducts formation from plasma-catalytic decomposition of urea were systematically investigated using an Al2 O3-packed dielectric barrier discharge（DBD） reactor at room temperature. Results show that the presence of O2 in the carrier gas accelerates the conversion of urea but leads to less generation of NH3. The final yield of NH3 in the gas phase decreased from 70.5%, 78.7%, 66.6% and 67.2% to 54.1%, 51.7%, 49.6% and 53.4% for applied voltages of 17, 19, 21 and 23 kV, respectively when air was used as the carrier gas instead of *** the viewpoint of energy savings, however, air carrier gas is better than N2 due to reduced energy consumption and increased energy efficiency for decomposition of a fixed amount of urea. Carrier gas composition has little influence on the major decomposition pathways of urea under the synergetic effects of plasma and Al2 O3 catalyst to give NH3 and CO2 as the main products. Compared to a small amount of N2 O formed with N2 as the carrier gas, however,more byproducts including N2O and NO2 in the gas phase and NH4 NO3 in solid deposits were produced with air as the carrier gas, probably due to the unproductive consumption of NH3, the possible intermediate HNCO and even urea by the abundant active oxygen species and nitrogen oxides generated in air-DBD plasma.

关键词： Ammonia production Urea decomposition Dielectric barrier discharge(DBD) plasma Al2O3 catalyst Carrier gas composition

A single atom photocatalyst co-doped with potassium and gallium for enhancing photocatalytic hydrogen peroxide synthesis

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Nano Research 2024年第8期17卷 7027-7038页

作者： Wenan Cai Yuichiro Tanaka xing zhu Teruhisa Ohno Department of Applied Chemistry Faculty of EngineeringKyushu Institute of TechnologyKitakyushu 804-8550Japan College of Bioresources Chemical and Materials Engineering Shaanxi University of Science&TechnologyXi’an 710021China

Polymer carbon nitride(PCN)is widely used in ***,pristine PCN has disadvantages such as insufficient visible light absorption and low photogenerated carrier separation efficiency that greatly limited the photocatalytic *** a non-toxic metal,gallium has the potential to solve the defects of *** ions coordinated with nitrogen in carbon nitride to form Ga-N active sites and improved the photocatalytic *** doped potassium ions form a transmission channel for charge redistribution and transfer between adjacent layers,which is beneficial for better separation of photoexcited *** this study,a series of PCN co-doped with gallium and potassium(Ga-K-PCN)were *** experimental results indicated photocatalytic generation of hydrogen peroxide proceeds through the 2e−oxygen reduction reaction ***,Nyquist plots and photocurrent results further proved that the presence of Ga-N sites and potassium ion doping could significantly improve the separation/transfer of intra-planar and interlayer charge carriers and thus enhance photocatalytic *** Ga10-K3-PCN photocatalysts promoted yield of H_(2)O_(2),with reactivity at 28.2μmol/(g·h)and solar-to-chemical conversion efficiency at 0.64%,surpassed that of a typical photo-catalyst based on PCN(0.18%).

关键词： photocatalysis gallium oxygen reduction reaction H_(2)O_(2) production

A novel texture clustering method based on shift invariant DWT and locality preserving projection

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Journal of Zhejiang University-Science A(Applied Physics & Engineering) 2009年第2期10卷 247-252页

作者： Rui xing San-yuan ZHANG Le-qing zhu School of Computer Science and Technology Zhejiang University Hangzhou 310027 China

We propose a novel texture clustering method. A classical type of(approximate) shift invariant discrete wavelet transform(DWT),dual tree DWT,is used to decompose texture images. Multiple signatures are generated from the obtained high-frequency bands. A locality preserving approach is applied subsequently to project data from high-dimensional space to low-dimensional space. Shift invariant DWT can represent image texture information efficiently in combination with a histogram signature,and the local geometrical structure of the dataset is preserved well during clustering. Experimental results show that the proposed method remarkably outperforms traditional ones.

关键词： Shift invariant DWT. Texture signature Local preserving clustering Dimension reduction k-means

Detection of the apoptosis of Jurkat cell using an electrorotation chip

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Frontiers in Biology 2006年第2期1卷 208-212页

作者： long Quan xing Wanli Department of Biological Sciences and Biotechnology Tsinghua UniversityBeijing 100084China School of Medicine Tsinghua UniversityBeijing 100084China National Engineering Research Center for Beijing Biochip Technology Beijing 102206China

The apoptosis of cells is one of the fields that attract increasing attention in biology ***,the cells are treated with chemicals when detecting *** is highly desired to detect apoptosis in a real-time *** of Jurkat cells was studied using a real-time electrorotation *** chip allows the detection of the cell membrane capacitance changes during the course of apoptosis and therefore facilitates the analysis of apoptosis in a real-time basis without involving any chemical treatment.

关键词： apoptosis electrorotation chip membrane capacitance

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基于共同体视角的高职院校实践育人模式探究

职业技术 2025年第1期24卷 55-61页

作者：张楠朱其志张龙江苏农牧科技职业学院江苏泰州225300

实践育人是新时代高职院校落实“三全育人”的重要举措,是培养全面发展的人才的有效途径。高职院校要深刻认识实践育人的本质内涵及其实践性、主体性、系统性、开放性、情境性、创造性、价值性等基本特征,客观分析近年来实践育人存在的... 详细信息

实践育人是新时代高职院校落实“三全育人”的重要举措,是培养全面发展的人才的有效途径。高职院校要深刻认识实践育人的本质内涵及其实践性、主体性、系统性、开放性、情境性、创造性、价值性等基本特征,客观分析近年来实践育人存在的现实问题,探索实施基于共同体视角的实践育人新模式,提出相应的策略选择,提升实践育人实效。

关键词：共同体实践育人基本特征育人模式

Sparse Modal Decomposition Method Addressing Underdetermined Vortex-Induced Vibration Reconstruction Problem for Marine Risers

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China Ocean Engineering 2024年第2期38卷 285-296页

作者： DU Zun-feng zhu Hai-ming YU Jian-xing State Key Laboratory of Hydraulic Engineering Intelligent Construction and Operation School of Civil EngineeringTianjin UniversityTianjin 300350China

When investigating the vortex-induced vibration(VIV)of marine risers,extrapolating the dynamic response on the entire length based on limited sensor measurements is a crucial step in both laboratory experiments and fatigue monitoring of real *** problem is conventionally solved using the modal decomposition method,based on the principle that the response can be approximated by a weighted sum of limited vibration ***,the method is not valid when the problem is underdetermined,i.e.,the number of unknown mode weights is more than the number of known *** study proposed a sparse modal decomposition method based on the compressed sensing theory and the Compressive Sampling Matching Pursuit(Co Sa MP)algorithm,exploiting the sparsity of VIV in the modal *** the validation study based on high-order VIV experiment data,the proposed method successfully reconstructed the response using only seven acceleration measurements when the conventional methods failed.A primary advantage of the proposed method is that it offers a completely data-driven approach for the underdetermined VIV reconstruction problem,which is more favorable than existing model-dependent solutions for many practical applications such as riser structural health monitoring.

关键词： motion reconstruction vortex-induced vibration(VIV) marine riser modal decomposition method compressed sensing

Transmission electron microscopy study on microstructure in Langmuir-Blodgett films of fullerene derivatives

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Chinese Science Bulletin 1998年第8期43卷 649-652页

作者： Chengfen long Yu Xu Changcheng zhu Daoben zhu Chinese Acad Sci Inst Chem Beijing 100080 Peoples R China

Surface pressure_area isotherms of two C 60derivatives, ethoxycarbonyldecylene_fullerene and bis(ethoxycarbonyldecylene)fullerene, have been investigated. The molecular aggregation at the air_water interface was reduced and the transfer behavior to various substrates was enhanced as compared with those of pure C 60. Structural characterization of the LB films was carried out using high resolution transmission electron microscopy (HRTEM). The HRTEM images revealed regular stacking of the densest packed rows of molecules in the LB films.

关键词： fullerene Langmuir_Blodgett films TEM images ECDF BECDF.