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Sensitivity analysis of modeling parameters to soot and PAHs prediction in ethylene inverse diffusion flame

Science China(Technological Sciences) 2024年第2期67卷 486-498页

作者： WU BingKun li tianjiao liU Dong MIIT Key Laboratory of Thermal Control of Electronic Equipment School of Energy and Power EngineeringNanjing University of Science and TechnologyNanjing 210094China Advanced Combustion Laboratory School of Energy and Power EngineeringNanjing University of Science and Technology Nanjing 210094China

The soot formation model based on inverse ethylene diffusion flames was performed to study the sensitivity of the soot formation process to the prediction *** effects of efficiency parameters such as soot inception,surface growth and coagulation on the simulation results were studied by using the adjustable efficiency *** addition,the reversible soot model and conjugate heat transfer(CHT)model were also introduced to explore their *** indicated that,among adjustable efficiency parameters,the nucleation efficiency had the greatest influence on the predicted soot and PAHs distributions,while the Habstraction-C2H2-addition(HACA)process and PAH adsorption surface growth efficiencies impacted *** adjustable efficiency parameters had a significant effect on the concentration of soot gaseous precursors and soot particles,but their effects on temperature,gas phase molecules,and intermediate species were not *** the nucleation efficiency increased from 2×10^(-6)to 1×10^(-4),the predicted value of the integrated soot was increased by nearly 50%,and the maximum primary particle number density and the number of aggregates were increased by an order of *** maximum concentration of BAPYR was ***,the peak temperature along the axial direction increased by only 3.5 *** the reversible soot model,the approximation results of the adjustable efficiency parameters could be modified,which showed the feasibility of the *** use of the CHT model promoted pyrolysis of the fuel below the outlet of the fuel tube,with high-temperature zones,soot zones,and PAHs zones moving towards higher flame ***,when using the reversible model and the CHT model,the maximum soot volume fraction decreased by 39%compared with the basic efficiency parameters,while the concentration of BAPYR increased by 162%,and the concentrations of gas phase species were decreased.

关键词： inverse diffusion flames soot formation soot model ethylene

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Joint method for reconstructing three-dimensional temperature of flame using Lucy-Richardson and nearest neighbor filtering using light-field imaging

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Science China(Technological Sciences) 2019年第7期62卷 1232-1243页

作者： li tianjiao YUAN Yuan SHUAI Yong TAN HePing Key Laboratory of Aerospace Thermophysics Ministry of Industry and Information Technology Harbin Institute of Technology

The real-time measurement and reconstruction of three-dimensional temperature are essential when studying the combustion process inside a flame. In the proposed sectioned flame light field imaging model, flame sections are reconstructed based on the characteristics identified using the Lucy-Richardson or nearest neighbor filtering methods, or a joint method involving a combination of both, to improve on the accuracy of two-dimensional temperature reconstruction. Compared to the results of a previous work, the proposed method increases the resolution in the depth of field direction and the extraction of the flame temperature of all sections from the same height ensures the accuracy of the reconstructed temperature distribution across the cross-section of the flame. The relative error when compared to the actual flame is less than 10%. Thus, this approach allows the accurate estimation of the three-dimensional temperature distribution inside a flame, and enables the rapid and effective reconstruction of the three-dimensional temperature field.

关键词： radiative transfer flame light field imaging temperature estimation

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Numerical analysis of hydraulic fracture propagation in deep shale reservoir with different injection strategies

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Journal of Rock Mechanics and Geotechnical Engineering 2024年第9期16卷 3558-3574页

作者： Yingjie Xia Mingyu Yao tianjiao li Hai Yang Chun'an Tang School of Civil Engineering Dalian University of TechnologyDalian116024China Deep Underground Engineering Research Center Dalian University of TechnologyDalian116024China CNPC Chuanqing Drilling Engineering Company limited Chengdu610051China

Deep shale reservoirs are characterized by elevated breakdown pressures,diminished fracture complexity,and reduced modified volumes compared to medium and shallow ***,it is urgent to investigate particular injection strategies that can optimize breakdown pressure and fracturing efficiency to address the increasing demands for deep shale reservoir *** this study,the efficiency of various stimulation strategies,including multi-cluster simultaneous fracturing,modified alternating fracturing,alternating shut-in fracturing,and cyclic alternating fracturing,was ***,the sensitivity of factors such as the cycle index,shut-in time,cluster spacing,and horizontal permeability was ***,the flow distribution effect within the wellbore was *** results indicate that relative to multi-cluster simultaneous fracturing,modified alternating fracturing exhibits reduced susceptibility to the stress shadow effect,which results in earlier breakdown,extended hydraulic fracture lengths,and more consistent propagation despite an increase in breakdown *** alternating shut-in fracturing benefits the increase of fracture length,which is closely related to the shut-in ***,cyclic alternating fracturing markedly lowers breakdown pressure and contributes to uniform fracture propagation,in which the cycle count plays an important *** alternating fracturing demonstrates insensitivity to variations in cluster spacing,whereas horizontal permeability is a critical factor affecting fracture *** wellbore effect restrains the accumulation of pressure and flow near the perforation,delaying the initiation of hydraulic *** simulation results can provide valuable numerical insights for optimizing injection strategies for deep shale hydraulic fracturing.

关键词： Fracture propagation Numerical simulation Hydraulic fracturing Rock failure process analysis(RFPA) Injection strategy

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Tailoring Texture to Highly Strengthen AZ31 Alloy Plate in the Thickness Direction via Pre-tension and Rolling-Annealing

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Acta Metallurgica Sinica(English Letters) 2023年第2期36卷 266-280页

作者： tianjiao li Jiang Zheng lihong Xia Haoge Shou Yongfa Zhang Rong Shi liuyong He Wenkai li International Joint Laboratory for light Alloys(Ministry of Education) College of Materials Science and EngineeringChongqing UniversityChongqing400044China Shenyang National Laboratory for Materials Science Chongqing UniversityChongqing400044China College of Mechanical Engineering Chongqing Technology and Business UniversityChongqing400067China Zhejiang Provincial Engineering Center of Integrated Manufacturing Technology and Intelligent Equipment Zhejiang University City CollegeHangzhou310015China

Conventional wrought Mg alloys,such as AZ31 and ZK60 rolled plates,usually exhibit significantly low tensile yield strength in the thickness *** can be attributed to the high activity of{10-12}tension twinning due to the strong basal texture(//ND,normal direction).In this work,the tensile yield strength in the ND of the as-rolled(AR)AZ31 plate increased from 50 to 150 MPa(increased by 200%)via simple processing,i.e.,pre-tension and rolling-annealing(PTRA)*** strong basal texture(//ND)of the AR plate was changed into a weakened fiber texture(⊥ND).The evolution of microstructures during PTRA treatment and the activated deformation modes during uniaxial tension were studied quantitatively and statistically by the means of intergranular misorientation(IM)and in-grain misorientation axes(IGMA)*** results indicate that various twin variants,as well as{10-12}-{10-12}secondary twins,were activated during pre-tension and rolling,and most residual matrix was consumed by twins after *** dominated deformation modes in tension changed from{10-12}tension twinning(the AR sample)to prismatic slip(the PTRA sample)in the early tensile *** underlying formation mechanism of the fiber texture and corresponding strengthening mechanism were discussed.

关键词： Pre-tension Annealing Tailoring texture Texture strengthening Deformation modes

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A multifunctional integrated simultaneously online screening microfluidic biochip for the examination of “efficacy-toxicity” and compatibility of medicine

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Chinese Chemical Letters 2019年第2期30卷 403-405页

作者： Hechen Wang tianjiao li Yongrui Bao Shuai Wang Xiansheng Meng College of liaoning University of Traditional Chinese Medicine liaoning University of Traditional Chinese Medicine-Agilent Technologies Modern TCM and Multi-Omics Research Collaboration Lab Liaoning University of Traditional Chinese Medicine

A multifunctional integrated microfluidic biochip device was engineered to estimate the activity-toxicity and composition principle of medicine in a cell model in vitro. This biochip could be used for disease cells and healthy cells in two modules of "Yin-Yang" on the same chip for detecting the medicine efficacytoxicity simultaneously, as well as adjust different gradient ratios of concentration through the Christmas tree structure in both "Yin-Yang" modules autonomously for detecting the best compatibility of medicine in maximum efficacy and minimal toxicity. In the applicability experiment, the best concentration of three chemical compounds including dinatin, diosmetin and cisplatin, were detected using the biochip and traditional 96-cell plate. Biochip assays showed perfect positive correlation compared with the results of traditional 96-cell plate, in addition presented advantages as less detection time and much lower price than the traditional 96-cell plate, which indicated the biochip is both convenient and ***, the novel microfluidic chip-based multifunctional integrated system congregated the virtues of high throughput, rapid, sensitive, specific, cost-effective, and similar to the physical environment of the human body, which was especially suitable for the medicine efficacy-toxicity and compatibility evaluation.

关键词： Multifunctional integrated microfluidic biochip Cirsium setosum(Wild.) Efficacy-toxicity of medicines Compatibility of medicines Simultaneously online screening

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Mechanism of total glucosides from Chishao(Radix Paeoniae Rubra)on proliferation and apoptosis of hepatocellular carcinoma cells via phosphatase and tensin homolog deleted on chromosome ten/phosphatidylinositol 3-kinase/protein kinase B signaling pathway

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Journal of Traditional Chinese Medicine 2021年第5期41卷 677-683页

作者： FAN Bingbing li tianjiao MENG Xiansheng WANG Shuai BAO Yongrui WANG Fei College of Pharmacy Liaoning University of Traditional Chinese MedicineDalian 116600China College of Graduate Studies Liaoning University of Traditional Chinese MedicineShenyang 110847China

OBJECTIVE:To investigate the possible molecular mechanism of total glycosides of Chishao(Radix Paeoniae Rubra)(TG-RPR)on proliferation and apoptosis of hepatocellular carcinoma ***:The proliferation of TG-RPR on Hep G2 cells was detected using the 3-(4,5-Dimethylthiazol-2-yl)-2,5-diphenyltetrazolium bromide(MTT)*** apoptosis of Hep G2 cells was measured by annexin V-FITC/double *** phosphatase and tensin homolog deleted on chromosome ten(PTEN)/phosphatidylinositol 3-kinase(PI3 K)/protein kinase B(Akt)signaling pathway was evaluated by Western Blot and reverse transcription-polymerase chain reaction(RT-PCR).RESULTS:TG-RPR can up-regulation the expression of pro-apoptotic factors such as PTEN and BCL2-Associated X(Bax),down-regulation the expression of anti-apoptotic factors including B-cell lymphoma-2(Bcl-2),PI3 K,and ***:TG-RPR significantly inhibits the proliferation of Hep G2 cells in a dose-dependent manner and promotes *** results demonstrated TG-RPR has significant inhibitory effect on Hep G2 *** results identify a critical role of TG-RPR in proliferation and apoptosis of Hep G2 cells via modulating PTEN/PI3 K/Akt signaling ***-RPR may offer a promise as a potential pharmaceutical therapy for hepatocellular carcinoma.

关键词： carcinoma,hepatocellular glycosides PTEN phosphohydrolase phosphatidylinositol 3-kinase proto-oncogene proteins c-akt Chishao(Radix Paeoniae Rubra)

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Fuel type recognition of ester isomer additives in flames by optical diagnostics coupled with machine learning method

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Science China(Technological Sciences) 2024年第11期67卷 3431-3442页

作者： HE JiaYing CHEN MengFei WU BingKun YING YaoYao YAN WeiJie li tianjiao liU Dong MIIT Key Laboratory of Thermal Control of Electronic Equipment School of Energy and Power EngineeringNanjing University of Science and TechnologyNanjing 210094China Advanced Combustion Laboratory School of Energy and Power EngineeringNanjing University of Science and TechnologyNanjing 210094China

Based on machine learning models,an approach for the type recognition of oxygenated additives(ester isomers,i.e.,methyl butyrate,methyl crotonate,ethyl acrylate,and ethyl acrylate)via optical diagnostics was *** utilizing optical diagnostic methods flame features were extracted,and three models including random forest(RF),artificial neural network(ANN),and support vector machine(SVM),were employed to establish the relationship between flame images and oxygenated ***,the impact of multiple factors on model performance,including image compression,dataset size,and feature number was also *** images of flame obtained from inverse diffusion flame under four different oxygenated additives and various combustion conditions were used as examples to examine the effectiveness of the proposed *** indicated that the accuracy of the recognition of ester isomers by the proposed approach exceeded 90%.Furthermore,it is observed that image compression had minimal impact on prediction accuracy but significantly reduced processing *** types of features contributed to predicting the type of ester isomers variously,and all models exhibited improved accuracy with an increased number of *** number of samples significantly affected model *** investigation of feature missing and insufficient training samples suggested that ANN and RF models were more suitable for cases with many missing features,while SVM was more suitable for dealing with small samples.

关键词： fuel recognition machine learning feature extraction optical diagnostics ester isomers

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Cu（I）-Catalyzed Three-Component Coupling of Trifluoromethyl Ketone N-Tosylhydrazones, Alkynes and Azides： Synthesis of Difluoromethylene Substituted 1,2,3-Triazoles

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Chinese Journal of Chemistry 2017年第4期35卷 387-391页

作者： Zhikun Zhang Qi Zhou Weizhi Yu tianjiao li Yan Zhang Jianbo Wang Beijing National Laboratory of Molecular Sciences (BNLMS) and Key Laboratory of Bioorganic Chemistry and Molecular Engineering of Ministry of Education College of Chemistry Peking University Beijing 100871 China The State Key Laboratory of Organometallic Chemistry Chinese Academy of Sciences Shanghai 200032 China

A Cul-catalyzed three-component coupling of trifluoromethyl ketone N-tosylhydrazones, alkynes and azides has been developed. The reaction represents a straightforward method to access difluoromethylene substituted 1,2,3-triazoles. Mechanistically, it has been proposed that the reaction follows a pathway involving the formation of Cu（1） triazolide intermediate, Cu（I） carbene formation, migratory insertion, and β-fluoride elimination. The trans- formation is featured by mild conditions, wide substrate scope and high efficiency.

关键词： Cu(I)-catalysis metal carbene migratory insertion β-fluoride elimination triazole

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Rh（I）-Catalyzed Reaction of Trifluoromethylketone N-Tosylhydrazones and Arylboronates

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Chinese Journal of Chemistry 2016年第5期34卷 473-476页

作者： Zhikun Zhang Weizhi Yu Qi Zhou tianjiao li Yan Zhang Jianbo Wang Beo.ing National Laboratory of Molecular Sciences (BNLMS) and Key Laboratory of Bioorganic Chemistry andMolecular Engineering of Ministry of Education College of Chemistry Peking University Beijing 100871 China State Key Laboratory of Organometallic Chemistry Chinese Academy of Sciences Shanghai 200032 China

Rh（I）-*** synthesis of 1,1-difluoro-2,2-diarylalkenes from trifluoromethylketone N-tosylhydrazones and arylboronates is presented in this communication. This new synthetic method is based on the Rh（l）-carbene migra- tory insertion followed by fl-fluoride elimination. In one particular case the protonation occurs instead offl-fluoride elimination, affording 2,2-diaryl trifluoroethane product.

关键词： Rh(l)-catalysis metal carbene migratory insertion β-fluoride elimination

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Coupled interactive effects of ammonia and hydrogen additions on ethylene diffusion flames: A detailed kinetic study

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Science China(Technological Sciences) 2024年第3期67卷 930-948页

作者： XIAO JiaYi XU TingTing SHU ZhiMei DENG QiGe ZHAO Xuan YING YaoYao li tianjiao liU Dong MIIT Key Laboratory of Thermal Control of Electronic Equipment School of Energy and Power EngineeringNanjing University of Science and TechnologyNanjing 210094China Advanced Combustion Laboratory School of Energy and Power EngineeringNanjing University of Science and TechnologyNanjing210094China

In order to create effective combustion technologies and fuels with low or no carbon emissions,the research was conducted to assess the coupled interactive effects of NH_(3) and H_(2) additions on ethylene counterflow diffusion flames from a kinetic *** effects of the NH_(3)/H_(2) combination on flame temperatures,major species,key radicals,important intermediate species,representative oxygenated species and NO_xwere *** results of the study utilizing fictitious inert NH_(3) and/or H_(2) revealed the chemical effects of the two *** was found that the NH_(3)/H_(2) coupled effects had a more effective inhibitory effect on soot precursors than the effects of corresponding sum of single NH_(3) or H_(2) *** production of soot precursors was promoted by the coupled chemical effects of NH_(3) and H_(2),but the coupled dilution and thermal effects were observed to have a greater impact,resulting in a decrease of the mole fractions of soot *** for the interaction of NH_(3) and H_(2) effects,the presence of H_(2) decreased the chemical effects of NH_(3) on the augmentation of C_(2)H_(2),A1,A2,and CH_(3)CHO mole *** NH_(3) addition alleviated the H_(2) chemical effects on increasing C_(2)H_(2),C_(3)H_(3),A1 and A2 ***,the NH_(3)chemical effects on C_(3)H_(3),OH and CH_(3)CHO were enhanced when H_(2) was *** presence of NH_(3) augmented the chemical effects of H_(2) on the growth of OH mole ***,the H_(2) chemical effects hindered the production of NO and NO_(2) in the presence of NH_(3).

关键词： NH_(3)/H_(2)addition kinetic analysis coupled interactive effects chemical effects

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