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Machine learning-driven optimization of plasma-catalytic dry reforming of methane

Journal of Energy Chemistry 2024年第9期96卷 153-163页

作者： Yuxiang Cai Danhua mei Yanzhen chen Annemie Bogaerts Xin tu Department of Electrical Engineering and Electronics University of LiverpoolLiverpool L693GJUK Research Group PLASMANT Department of ChemistryUniversity of AntwerpUniversiteitsplein 1BE-2610 Wilrijk-AntwerpBelgium College of Electrical Engineering and Control Science Nanjing Tech UniversityNanjing 211816JiangsuChina

This study investigates the dry reformation of methane(DRM)over Ni/Al_(2)O_(3)catalysts in a dielectric barrier discharge(DBD)non-thermal plasma reactor.A novel hybrid machine learning(ML)model is developed to optimize the plasma-catalytic DRM reaction with limited experimental *** address the non-linear and complex nature of the plasma-catalytic DRM process,the hybrid ML model integrates three well-established algorithms:regression trees,support vector regression,and artificial neural networks.A genetic algorithm(GA)is then used to optimize the hyperparameters of each algorithm within the hybrid ML *** ML model achieved excellent agreement with the experimental data,demonstrating its efficacy in accurately predicting and optimizing the DRM *** model was subsequently used to investigate the impact of various operating parameters on the plasma-catalytic DRM *** found that the optimal discharge power(20 W),CO_(2)/CH_(4)molar ratio(1.5),and Ni loading(7.8 wt%)resulted in the maximum energy yield at a total flow rate of∼51 mL/***,we investigated the relative significance of each operating parameter on the performance of the plasma-catalytic DRM *** results show that the total flow rate had the greatest influence on the conversion,with a significance exceeding 35%for each output,while the Ni loading had the least impact on the overall reaction *** hybrid model demonstrates a remarkable ability to extract valuable insights from limited datasets,enabling the development and optimization of more efficient and selective plasma-catalytic chemical processes.

关键词： Plasma catalysis Machine learning Process optimization Dry reforming of methane Syngas production

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Laser light scattering technique for non-invasive in situ simultaneous measurements on elastic constants and viscosity coefficients of nematic liquid crystals

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Science China(Physics,Mechanics & Astronomy) 2004年第1期47卷 79-85页

作者： tu mei HUANG Yaoxiong Institute of Biomedical Engineering Jinan University Guangzhou 510632 China Institute of Biomedical Engineering Jinan University Guangzhou 510632 China

The laser light scattering technique for non-invasivein situ simultaneous measurements on elastic constants and viscosity coefficients of nematic liquid crystals is introduced. By measuring the autocorrelation function of the scattered light from nematic liquid crystals at different scattering angles, the splay and twist elastic constantsK 11 andK 22 are obtained from the amplitudes of the autocorrelation function, and the viscosity coefficients ofη Splay andη Twist are determined using the viscoelastic ratiosK 11/η Splay andK 22 η Twist from the telaxation parameters of the two modes.

关键词： dynamic light scattering, nematic liquid crystal, elastic constants, viscosity coefficients.

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Large-scale characteristics of landfalling tropical cyclones with abrupt intensity change

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Frontiers of Earth Science 2019年第4期13卷 808-816页

作者： Qianqian JIU Feng XU Jianjun XU mei LIANG Shifei tu Siqi chen South China Sea Institute of Marine Meteorology Guangdong Ocean UniversityZhanjiang 524088China College of Ocean and Meteorology Guangdong Ocean UniversityZhanjiang 524088China Southern Marine Science and Engineering Guangdong Laboratory Zhanjiang 524088China

Data from the China Meteorological Administration and ERA-Interim are used to examine the environmental characteristics of landfalling tropical cyclones(TCs)with abrupt intensity *** results show that,of all 657 landfalling TCs during 1979-2017,71%,70%and 65%of all landfalling TDs,TSs and TYs,respectively,*** all the 16595 samples,4.0%and 0.2%of typhoons and tropical storms,respectively,experience over-water rapid intensification(RI)process during their life ***,4.5%and 0.6%of typhoons and tropial storms,respectively,undergo overwater rapid decay(RD).These two kinds of cases,i.e.,RI and RD,are used to analyze their associated large-scale *** show that the RI cases are generally on the south side of the strong western Pacific subtropical high(WPSH);warm sea surface temperatures(SSTs)and sufficient water vapor fluxes existing in RI samples is a dominant feature that is conducive to the development of ***,the moderate low-level relative vorticity is favorable for TC *** the contrary,the RD TCs are located on the west side of the WPSH;significant decreasing SSTs and low-level water vapor transport may synergistically contribute to ***,low-level relative vorticity seems to be unfavorable for the development of TCs.

关键词： landfalling tropical cyclone abrupt intensity change environmental factors dynamic composite analysis

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Effective chemotherapy for submandibular gland carcinoma ex pleomorphic adenoma with lung metastasis after radiotherapy: A case report

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World Journal of Clinical Cases 2019年第6期7卷 792-797页

作者： Zhi-Yuan chen Yu Zhang Yan tu Wei Zhao mei Li Cancer Center West China HospitalSichuan University Oncology Department the Second People’s Hospital of Yunnan Province Radiology Department Yunnan Tumor Hospital Pathology Department West China HospitalSichuan University Department of Head & Neck Cancer Cancer CenterWest China HospitalSichuan University

BACKGROUND Only a few cases of carcinoma ex pleomorphic adenoma arising in the submandibular gland have ever been reported,all with a poor prognosis. The standard treatment for salivary gland carcinoma ex pleomorphic adenoma is surgical resection combined with postoperative radiotherapy,but the necessity of chemotherapy as well as the most appropriate treatment regimen for patients with distant metastasis after radiotherapy remains *** SUMMARY This report presents the case of a 73-year-old woman who suffered submandibular gland carcinoma ex pleomorphic adenoma. She accepted surgery to remove the mass; she was found to have lung metastasis after *** condition was controlled by chemotherapy with liposomal doxorubicin plus *** The positive clinical outcome in the patient reveals that this chemotherapy regimen may be an alternative treatment for such a condition.

关键词： Malignant pleomorphic adenoma Salivary gland tumors Chemotherapy Carcinoma ex pleomorphic adenoma Case report

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Superresolution measurement on the minute fluctuation of cell membrane

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Chinese Science Bulletin 2006年第2期51卷 143-147页

作者： LI ding HUANG Yaoxiong ZHAO Haiyan tu mei chen Wenxin Institute of Biomedical Engineering Ji Nan University Guangzhou 510632 China Department of Equipment Kunming General Hospital Kunming 650032 China Ophthalmic Center Sun Yat-sen University Guangzhou 510080 China

A novel method for measuring the min- ute fluctuation of cell membrane is developed by modifying the super-resolution theory, increasing dimension in Fourier space, enhancing brightness gradient and utilizing maximum adaptive weighted averaging filter (MAWA) in obstructing noise. The application of the method in studying aspergillus fla- vus cell (AFC) and red blood cell and the new find- ings from the study show that it is a useful tool.

关键词：细胞膜超分辨率测量动态数列图像平均值滤波器

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Synthesis and Crystal Structure of a New cis-Dioxovanadium (V) Complex with Pyruvic Acid Isonicotinyl Hydrazone (PAINH)

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Chinese Journal of Structural Chemistry 2006年第2期25卷 219-223页

作者： chen Rui-Jin ZHOU Yin-Zhuang HU Dai-Di tu Shu-Jie XIAO Ling-mei DePartment of Chemistry Capital Normal University Beijing 100037 China

A new cis-dioxovanadium （V） complex [VO2（C9H8N3O3）]（C5H5N） involving a carboxyl group coordination employing a tridentate Schiff Base derived from pyruvic acid and isonicotinyl hydrazide is reported. This complex crystallizes in triclinic, space group P1^- with a = 7.3522 （12）, b = 7.8376（13）, c = 14.898（2） ,A°, a = 84.010（2）, β = 86.568（2）, γ= 64.586（2）°, V = 771.1（2）A °^3 ,Z = 2, F（000） = 376, Mr = 368.22, D, = 1.586 g/cm^3, g = 0.677 mm ^-1, R = 0.0421 and wR = 0.1253. The vanadium atom of the dioxovanadium （V） is five-coordinated to furnish a distorted trigonal bipyramid geometry.

关键词： dioxovanadium complex pyruvic acid isonicotinyl hydrazone (PAINH),crystal structure

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Ionic liquid based dispersive liquid-liquid microextraction of aromatic amines in water samples

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Chinese Chemical Letters 2008年第8期19卷 985-987页

作者： Yun Chang Fan Zheng Liang Hu mei Lan chen Chao Shen tu Yan Zhu Department of Chemistry Xixi Campus Zhejiang University Hangzhou 310028 China The Zhejiang University National Science Park Hangzhou 310013 China Biology and Environment Engineering College of Zhejiang Shuren University Hangzhou 310015 China

In this work, a new microextraction method termed ionic liquid based dispersive liquid-liquid microextraction （IL-DLLME） was demonstrated for the extraction of 2-methylaniline, 4-chloroaniline, 1-naphthylamine and 4-aminobiphenyl in aqueous matrices. After extraction the ionic liquid （IL） phase was injected directly into the high performance liquid chromatography （HPLC） system for determination. Some parameters that might affect the extraction efficiency were optimized. Under the optimum conditions, good linear relationship, sensitivity and reproducibility were obtained. The limits of detection （LOD, S/N = 3） for the four analytes were in the range of 0.45-2.6 μg L^-1. The relative standard deviations （R.S.D., n = 6） were in the range of 6.2-9.8%. This method was applied for the analysis of the real water samples. The recoveries ranged from 93.4 to 106.4%. The main advantages of the method are high speed, high recovery, good repeatability and volatile organic solvent-free.

关键词： Ionic liquid (IL) Dispersive liquid-liquid microextraction (DLLME) High performance liquid chromatography (HPLC) Aromatic amines

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Effect of ferrotitanium slag on microstructure and properties of Al_(2)O_(3)-SiC-C castables for iron runner

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Journal of Iron and Steel Research International 2024年第9期31卷 2122-2132页

作者： tu Long Hua-zhi Gu mei-jie Zhang Ao Huang Lv-ping Fu Ding chen Wen-dong Qiu Mao-qi Ju The State Key Laboratory of Refractories and Metallurgy Wuhan University of Science and TechnologyWuhan430081HubeiChina Baowu Equipment Intelligent Technology Co. Ltd.Shanghai200000China MCC Group Wuhan Research Institute of Metallurgy Construction Co.Ltd.Wuhan430081HubeiChina

Ferrotitanium slag(FS)is a waste slag produced during the smelting of ferrotitanium alloys by thermite *** alumina content is high and can be used as alumina raw *** runner castables containing different amounts of FS were prepared and *** results show that the introduction of FS is beneficial to the sintering of the castables *** the FS concentration is 11.2 wt.%,the aggregate and matrix of the castables sample have a good combination,and the mechanical strength of the Al_(2)O_(3)–SiC–C castable reaches a maximum at room ***,excessive introduction of FS generates a large amount of anorthite phase,which reduces the mechanical strength of the Al_(2)O_(3)–SiC–C castable at room *** addition,the high-melting phase CaTiO_(3)is formed in FS,which has good mechanical ***,the cracks of FS are reduced,and the combination between phases is closer,thus significantly improving the hot modulus of rupture of the *** the FS concentration is not above 33.6 wt.%,the castables show good slag *** TiO_(2)in FS is transformed into TiC by carbothermal reaction,which is enriched at the boundary and prevents further reaction of the slag.

关键词： Ferrotitanium slag Al_(2)O_(3)-SiC-C castable Hot modulus of rupture Slag resistance

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An Iterative Rounding 2-approximation Algorithm for the k-partial Vertex Cover Problem

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Acta Mathematicae Applicatae Sinica 2014年第2期30卷 271-278页

作者： Jian-hua tu Jun-feng DU Feng-mei YANG School of Science Beijing University of Chemical Technology

We study a generalization of the vertex cover problem. For a given graph with weights on the vertices and an integer k, we aim to find a subset of the vertices with minimum total weight, so that at least k edges in the graph are covered. The problem is called the k-partial vertex cover problem. There are some 2-approximation algorithms for the problem. In the paper we do not improve on the approximation ratios of the previous algorithms, but we derive an iterative rounding algorithm. We present our technique in two algorithms. The first is an iterative rounding algorithm and gives a （2 ＋ Q/OPT ）-approximation for the k-partial vertex cover problem where Q is the largest finite weight in the problem definition and OPT is the optimal value for the instance. The second algorithm uses the first as a subroutine and achieves an approximation ratio of 2.

关键词： approximation algorithm iterative rounding k-partial vertex cover combinatorial optimization

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Antidepressant effect of electroacupuncture regulates signal targeting in the brain and increases brain- derived neurotrophic factor levels

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Neural Regeneration Research 2016年第10期11卷 1595-1602页

作者： dong-mei Duan Ya tu Ping Liu Shuang Jiao Department of Health Care of South Building Chinese PLA General Hospital Beijing China Acupuncture College of Beijing University of Chinese Medicine Beijing China Department of Clinical Pharmacology Chinese PLA General Hospital Beijing China Journal of Traditional Chinese Medicine Beijing China

Electroacupuncture improves depressive behavior faster and with fewer adverse effects than antidepressant medication. However, the antidepressant mechanism of electroacupuncture remains poorly understood. Here, we established a rat model of chronic unpredicted mild stress, and then treated these rats with electroacupuncture at Yintang （EX-HN3） and Baihui （DU20） with sparse waves at 2 Hz and 0.6 mA for 30 minutes, once a day. We found increased horizontal and vertical activity, and decreased immobility time, at 2 and 4 weeks after treatment. Moreover, levels of neurotransmitters （5-hydroxytryptamine, glutamate, and y-aminobutyric acid） and protein levels of brain-derived neurotrophic factor and brain-derived neurotrophic factor-related proteins （TrkB, protein kinase A, and phosphorylation of cyclic adenosine monophosphate response element binding protein） were increased in the hippocampus. Similarly, protein kinase A and TrkB mRNA levels were increased, and calcium-calmodulin-dependent protein kinase lI levels decreased. These findings suggest that electroacupuncture increases phosphorylation of cyclic adenosine monophosphate response element binding protein and brain-derived neurotrophic factor levels by regulating multiple targets in the cyclic adenosine rnonophosphate response element binding protein signal- ing pathway, thereby promoting nerve regeneration, and exerting an antidepressive effect.

关键词： nerve regeneration depression chronic unexpected mild stress electroacupuncture brain-derived neurotrophic factor neurotransmitter cyclic adenosine monophosphate response element binding protein signal pathway protein kinase A TrKB fluoxetine neural regeneration

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