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Multi-objective constructal design for quadrilateral heat generation body based on thermal-entransy theory and NSGA-Ⅱ

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Science China(Technological Sciences) 2024年第9期67卷 2777-2786页

作者： CHEN LinGen ZHU HongWei GE YanLin shi shuangshuang FENG HuiJun Institute of Thermal Science and Power Engineering Wuhan Institute of TechnologyWuhan 430205China Hubei Provincial Engineering Technology Research Center of Green Chemical Equipment Wuhan 430205China School of Mechanical Electrical EngineeringWuhan Institute of TechnologyWuhan 430205China

Based on thermal-entransy theory, the multi-objective constructal design of quadrilateral heat generation body(HGB) with similar shapes of leaves is studied further. The relationship between the aspect ratio of quadrilateral HGB and average temperature difference based on thermal-entransy dissipation is compared with that between the aspect ratio of quadrilateral HGB and the maximum temperature difference(MTD). The relationship between a composite function, consisting of linear weighting sum of the average temperature difference and MTD, and aspect ratio is obtained, and the optimal aspect ratios under minimum composite function with different weighting coefficients are obtained. Using the NSGA-Ⅱ algorithm, the Pareto frontier containing a series of compromise results of average temperature difference and MTD is obtained, and optimization results are compared using the deviation index. There is no aspect ratio to make both MTD and average temperature difference reach the minimum, and the optimal aspect ratio under the minimum MTD is smaller than that under the minimum average temperature difference. The optimal aspect ratio is obtained by making the composite function reach the minimum, and the optimal aspect ratios obtained by minimizing the composite function with different weighting coefficients are different. Compared with the construct of the initial design, the value of the composite function with optimal construct decreases by 1.9%, and the aspect ratio of the quadrilateral HGB decreases by 9.1%. The average temperature difference with the optimal construct increases by 2.1%, and the MTD with the optimal construct decreases by 5.6%. The deviation index under multi-objective optimization is smaller than that under single-objective optimization, and the obtained construct has better comprehensive thermal conductivity. Compared with TOPSIS and LINMAP decision-making methods, the average temperature difference with composite function optimization increases by 0.5

关键词： thermal-entransy theory constructal theory heat conduction quadrilateral heat generation body composite function NSGA-Ⅱ

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芦荟护手霜制备及影响因素分析

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化工管理 2024年第26期 148-151页

作者：师双双李琼江苏省徐州医药高等职业学校江苏徐州221000

为将芦荟提取物应用到护手霜中,采用单因素法来优化处方工艺,分别分析处方中油相组成和比例、油水相比例、乳化剂组成和用量、乳化温度等因素的影响,产品评价指标为感官评价、耐热耐寒性、分层实验及刺激性等。结果表明,最佳处方工艺条... 详细信息

为将芦荟提取物应用到护手霜中,采用单因素法来优化处方工艺,分别分析处方中油相组成和比例、油水相比例、乳化剂组成和用量、乳化温度等因素的影响,产品评价指标为感官评价、耐热耐寒性、分层实验及刺激性等。结果表明,最佳处方工艺条件为:油相组成为液体石蜡(10%)、凡士林(17%)的组合物,油水相比例为1∶2,乳化剂选用十六十八醇(3%)、单硬脂酸甘油酯(7%)和吐温-60(7%)混合物,油水相混合温度为60~80℃。此条件下制得的芦荟护手霜色泽均匀,质地清爽水润,具有良好的耐寒耐热性和稳定性,为芦荟提取物在护肤行业的研究提供一定的理论参考。

关键词：芦荟护手霜单因素乳化稳定性

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Power and efficiency optimizations of Maisotsenko-Atkinson,Dual and Miller cycles and performance comparisons with corresponding traditional cycles

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Science China(Technological Sciences) 2023年第12期66卷 3393-3411页

作者： CHEN LinGen ZHU FuLi shi shuangshuang GE YanLin FENG HuiJun Institute of Thermal Science and Power Engineering Wuhan Institute of TechnologyWuhan 430205China Fute Technology Hangzhou 310012China Hubei Provincial Engineering Technology Research Center of Green Chemical Equipment Wuhan 430205China School of Mechanical&Electrical Engineering Wuhan Institute of TechnologyWuhan 430205China

Maisotsenko cycle(M-cycle)has been combined with some cooling and power cycles,and behaves important thermodynamic ***-time thermodynamics(FTT)is applied to establish three endoreversible models of M-Atkinson,M-Dual and M-Miller *** are performed based on models of endoreversible Atkinson,Dual and Miller cycles by combing FTT model with M-cycle *** output(POW)and thermal efficiency(TEF)of those M-cycles are studied and optimized by numerical *** maximum power output(MPO)and the corresponding pressure ratio and TEF,the maximum TEF and the corresponding pressure ratio and POW,as well as optimal ranges of pressure ratio are *** of mass flow rate of circulating water injection,initial cycle temperature and maximum cycle temperature on cycle POW,TEF and optimal pressure ratio range are *** optimal performances of the three M-cycles are compared with those of traditional Atkinson,Dual and Miller cycles under the same *** results show that for the three M-cycles,end temperature of adiabatic expansion process of M-cycle is less than that of the corresponding traditional cycle,POW and TEF at arbitrary pressure ratio of M-cycle are much higher than those of the corresponding traditional cycle,and performance characteristics of M-cycles are superior to those of the corresponding traditional cycles.

关键词： Maisotsenko-Atkinson cycle Maisotsenko-Dual cycle Maisotsenko-Miller cycle power efficiency finite time thermodynamic optimization

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长三角地区2004-2022年NO_(2)柱浓度演变特征及其主要影响因素分析

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环境科学研究 2024年第5期37卷 950-962页

作者：沈利娟刁一伟贾浩博王红磊施双双赵天良无锡学院大气与遥感学院江苏无锡214105 无锡学院中国气象局生态系统碳源汇重点开放实验室江苏无锡214105 南京信息工程大学中国气象局气溶胶-云-降水重点开放实验室江苏南京210044

为研究长三角地区NO_(2)柱浓度长期的时间演变特征及其影响因素,利用OMI卫星观测的NO_(2)柱浓度数据、GPM降雨数据、MERRA-2再分析数据和社会经济数据,结合地面NO_(2)浓度数据,分析了卫星数据与地面观测数据的一致性以及NO_(2)柱浓度的... 详细信息

为研究长三角地区NO_(2)柱浓度长期的时间演变特征及其影响因素,利用OMI卫星观测的NO_(2)柱浓度数据、GPM降雨数据、MERRA-2再分析数据和社会经济数据,结合地面NO_(2)浓度数据,分析了卫星数据与地面观测数据的一致性以及NO_(2)柱浓度的年际、月际和季节性变化特征及其主要影响因素.结果表明:①OMI卫星观测的NO_(2)柱浓度与地面观测的NO_(2)浓度一致性较好,能够较好地反映地面NO_(2)浓度分布及其时间变化特征.②长三角地区2004-2022年NO_(2)柱浓度高值主要集中在南京、常州、无锡、苏州、上海和杭州等核心城市地区;NO_(2)柱浓度年际变化呈波动变化趋势,可分为2个阶段,2004-2011年为增加阶段,年均变化率为0.68%,2011-2022年为降低阶段,年均变化率为-4.51%.2011年NO_(2)柱浓度达最大值〔(12.63×10^(15)±9.16×10^(15))molec/cm^(2)〕,2022年达到最小值,仅为(7.16×10^(15)±4.80×10^(15))molec/cm^(2).③受气象条件和排放源的影响,导致NO_(2)柱浓度存在明显的月际和季节性变化,呈冬季>春季≈秋季>夏季的特征,其中12月〔(20.20×10^(15)±8.89×10^(15))molec/cm^(2)〕最高,7月〔(4.81×10^(15)±1.72×10^(15))molec/cm^(2)〕最低.④长三角地区NO_(2)柱浓度的长期演变特征受社会经济因素的影响.第二产业中的燃煤源和第三产业中交通运输对NO_(2)柱浓度的影响较大,机动车排放是长三角地区核心城市群对流层NO_(2)的重要来源.研究显示,2004-2022年随着一系列大气污染防治措施的执行,长三角地区在经济快速发展的同时NO_(2)柱浓度持续降低,充分证明了经济发展与环境保护可以实现良性互动.

关键词：长三角地区 NO_(2)柱浓度时间演变影响因素社会经济因素

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Power and efficiency optimizations for an open cycle two-shaft gas turbine power plant

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Propulsion and Power Research 2023年第4期12卷 457-466页

作者： Lingen Chen Huijun Feng Yanlin Ge shuangshuang shi Institute of Thermal Science and Power Engineering Wuhan Institute of TechnologyWuhan 430205China Hubei Provincial Engineering Technology Research Center of Green Chemical Equipment Wuhan 430205China School of Mechanical&Electrical Engineering Wuhan Institute of TechnologyWuhan 430205China

In finite-time thermodynamic analyses for various gas turbine cycles,there are two common models:one is closed-cycle model with thermal conductance optimization of heat exchangers,and another is open-cycle model with optimization of pressure drop(PD)*** of optimization also with searching optimal compressor pressure ratio(PR).This paper focuses on an open-cycle model.A two-shaft open-cycle gas turbine power plant(OCGTPP)is modeled in this *** of power output(PP)and thermal conversion efficiency(TCE)are deduced,and these performances are optimized by varying the relative PD and compressor *** results show that there exist the optimal values(0.32 and 14.0)of PD and PR which lead to double maximum dimensionless PP(1.75).There also exists an optimal value(0.38)of area allocation ratio which leads to maximum TCE(0.37).Moreover,the performances of three types of gas turbine cycles,such as one-shaft and two-shaft ones,are *** the relative pressure drop at the compressor inlet is small,the TCE of third cycle is the biggest one;when this pressure drop is large,the PP of second cycle is the biggest *** results herein can be applied to guide the preliminary designs of OCGTPPs.

关键词： Two-shaft gas turbine power plant Efficiency Power Area distribution Pressure drop Finite-time thermodynamics

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Annual variations of black carbon over the Yangtze River Delta from 2015 to 2018

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Journal of Environmental Sciences 2020年第10期32卷 72-84页

作者： Yue Tan Honglei Wang shuangshuang shi Lijuan Shen Chen Zhang Bin Zhu Song Guo zhijun Wu Ziyi Song Yan Yin Ankang Liu Collaborative Innouation Center on Forecast and Evaluation of Meteorological Disasters Key Laboratory for Aerosol-Cloud-Precipitation of China Meteorological AdmiristrationNanjing Uniuersity of information Science & TechnologyNanjing 210044China State Key Joint Laboratory of Enuironment Simulation and Pollution Control(Peking University)College of Enuironmental Sciences and Engineering Peking UniuersityBeijing 100871China State Key Laboratory of Atmospheric Boundary Layer Physics and Atmospheric Chemistry Institute of Atmospheric PhysicsChinese Academy of SciencesBeijing 100o29China

In this study,the black carbon (BC) measurements in the atmosphere of Nanjing,China were continuously conducted from 2015 to 2018 using a Model AE-33 *** combining dataset of PM_(2.5),PM_(10),CO,NO_2,SO_2,O_3 and meteorological parameters,the temporal variations and the source apportionment of BC were given in this *** results showed that the PM_(2.5) mass concentrations decreased in Nanjing,with an average annual rate of variation of 6.50μg/(m^3·year).Differently,the annual average concentrations of BC increased with an average annual variation rate of 214.71 ng/(m^3·year).The seasonal variations showed the pattern of BC mass concentrations in winter>autumn>spring>*** diurnal variations of BC mass concentrations showed a double-peak in all four *** first peak occurred at approximately 7:00 in spring,summer and autumn and around 8:00 in *** second peak took place after 18:*** average AAE (absorption ?ngstr?m exponent) was 1.26 with a maximum of 1.35 during wintertime and the lowest(1.12) during *** addition,the AAE was smaller in the daytime than that at night,with a minimum occurring between 13:00 and 14:*** and visibility show a good power-function relationship at different humidity *** average values of the visibility thresholds of the BC mass concentrations in spring,summer,autumn and winter were 1.326,5.522,1.340 and 0.708μg/m^3,*** greater the relative humidity,the smaller the visibility threshold for the BC mass concentrations was.

关键词： Black carbon(BC) Absorptionngstrm exponent(AAE) Meteorological elements Temporal characteristics

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基于EEMD分解法对北武当观测站形变资料受气压干扰特征分析

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科技创新与生产力 2024年第7期45卷 94-96页

作者：王晓霞高翠珍史双双薛锦明薛生瑞山西省地震局太原地震监测中心站山西太原030025 山西省地震局山西太原030021

本文通过选取北武当观测站的水平摆、伸缩仪,对观测数据受气压干扰明显的典型事件进行分析,研究气压变化如何对观测数据变化产生的影响,并对原始观测数据采用EEMD分解出含有干扰信息的IMF分量;对IMF分量进行Hilbert变换得出Hilbert时频... 详细信息

本文通过选取北武当观测站的水平摆、伸缩仪,对观测数据受气压干扰明显的典型事件进行分析,研究气压变化如何对观测数据变化产生的影响,并对原始观测数据采用EEMD分解出含有干扰信息的IMF分量;对IMF分量进行Hilbert变换得出Hilbert时频图。结果表明,水平摆和伸缩仪受气压干扰明显,且气压干扰具有延时性。总之,通过EEMD方法对北武当观测站测向资料的分析,说明这种方法对气压干扰的研究有较好的效果,提高了识别干扰信息的能力。

关键词：形变资料 EEMD分解气压

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In vitro induction of human embryonic stem cells into hepatocyte-like cells

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Chinese Science Bulletin 2007年第23期52卷 3221-3226页

作者： PEI HaiYun WANG YunFang YANG YinXiang PENG HongMei XI JiaFei shi shuangshuang LIU YuXiao NAN Xue BAI CiXian PEI XueTao Department of Stem Cell and Regenerative Medicine Beijing Institute of Transfusion Medicine Beijing 100850 China Department of Obstetrics and Gynecology General Hospital of PLA Beijing 100853 China

Human embryonic stem cells (hES cells) are pluripotent and provide a unique, unlimited resource for human hepatocytes, which can serve as a novel cell source for cell transplantation and bioartificial liver (BAL). Here, we have developed a procedure by which hES cells can differentiate into hepatocyte-like cells. After being cultured in suspension in bacteriological petri dishes for 7 d, hES cells developed into cystic embryoid bodies (EBs). The EBs were then cultured in conditional medium containing dexa- methasone and insulin in collagen type I-coated tissue culture dishes for two weeks. The hES cell-derived hepatocyte-like cells (HLCs) displayed some morphologic characteristics of hepatocytes. Reverse-transcription polymerase chain reaction (RT-PCR) and immunofluorescence cell staining proved that the induced HLCs expressed several hepatocyte specific genes including AFP, ALB, CYP1B1 and cytokeratins CK18 and CK19. Furthermore, the induced cells executed a range of hepa- tocyte functions, such as ICG uptake/excretion, glycogen deposits, albumin production and ammonium metabolism. Taken together, our results show that HLCs exhibit similar morphologic, phenotypic, and functional characteristics to hepatocytes.

关键词：胚胎干细胞肝细胞细胞分化细胞治疗

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Isolation and analysis of SSEA-4 positive cells derived from fetal marrow mesenchymal stem cells

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Chinese Science Bulletin 2006年第12期51卷 1462-1466页

作者： LIU Daqing YANG Yinxiang GAO Yanhong YUAN Hongfeng QIN Lipeng WANG Yunfang NAN Xue shi shuangshuang YUE Wen PEI Xuetao Research Center of Stem Cell and Regenerative Medicine Institute of Transfusion Medicine Academy of Military Medical Sciences Beijing 100850 China

A big issue in stem cell research is to derive prospective totipotential stem cells. In this study, fMSC-SSEA-4 cells expressing SSEA-4 anti- gen were isolated from fetal marrow masenchymal stem cells (fMSCs) using immunomagnetic bead sorting technique. The totipotent cells were identified and their biological characteristics were further stud- ied. The expression of Oct-4 and SSEA-4, carcino- genicity, and the ability to differentiation of fMSC- SSEA-4 cells were evaluated to verify the totipotent potential. fMSC-SSEA-4 cells were isolated suc- cessfully from fMSCs (2.5% among fMSCs), while no obvious differences were seen in morphology, growth curve, cell cycle and immunophenotype, Oct-4 and SSEA-4 expression between fMSC-SSEA-4 cells and fMSCs. fMSC-SSEA-4 cells showed normal diploid chromosome karyotype and no carcinoma was in- duced after inoculation into nude mice. fMSC- SSEA-4 cells could be induced to fat cells, osteo- genic cells and neuron-like cells in vitro with different induced factors. The results indicated that there may be a few totipotent cells among the fMSCs and it may offer the experimental basis for the further study and application of fMSCs.

关键词： fMSCs SSEA-4抗原全能性干细胞分离

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In vitro differentiation of human adipose-derived mesenchymal stem cells into endothelial-like cells

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Chinese Science Bulletin 2006年第15期51卷 1863-1868页

作者： GUAN Lidong LI Shaoqing WANG Yunfang YUE Huimin LIU Daqing HE Lijuan BAI Cixian YAN Fang NAN Xue shi shuangshuang PEI Xuetao Department of Stem Cell and Regenerative Medicine Beijing Institute of Transfusion Medicine Beijing 100850 China Stomatology Hospital the Fourth Military Medical University Xi'an 710032 China

The neovascularization of ischemic tis- sue is a crucial initial step for the functional rehabili- tation and wound healing. However, the short of seed cell candidate for the foundation of vascular network is still a big issue. Human adipose tissue derived mesenchymal stem cells (hADSCs), which possess multilineage potential, are capable of adipogenic, osteogenic, and chondrogenic differentiation. We examined whether this kind of stem cells could dif- ferentiate into endothelial-like cells and participate in blood vessel formation, and whether they could be used as an ideal cell source for therapeutic angio- genesis in ischemic diseases or vascularization of tissue constructs. The results showed that hADSCs, grown under appropriately induced conditions, dis- played characteristics similar to those of vessel en- dothelium. The differentiated cells expressed endo- thelial cell markers CD34 and vWF, and had high metabolism of acetylated low-density lipoprotein and prostacyclin. In addition, the induced cells were able to form tube-like structures when cultured on matrigel. Our data indicated that induced hADSCs could ex- hibit characteristics of endothelial cells. Therefore, these cells, as a source of human endothelial cells, may find many applications in such realms as engi- neering blood vessels, endothelial cell transplantation for myocardial regeneration, and induction of angio- genesis for treatment of regional ischemia.

关键词：脂肪组织干细胞内皮细胞组织工程

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