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Parameter study of sinter waste heat recovery in vertical tank based on energy and exergy analysis

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Journal of Iron and Steel Research(International) 2020年第1期27卷 22-32页

作者： Jun-sheng Feng Sheng Zhang Hui Dong Gang Pei School of Environment and Energy Engineering Anhui Jianzhu UniversityHefei 230026AnhuiChina School of Metallurgy Northeastern UniversityShenyang 110819LiaoningChina Department of Thermal Science and Energy Engineering University of Science and Technology of ChinaHefei 230026AnhuiChina

The parameter study of sinter waste heat recovery in vertical tank was conducted numerically by using energy and exergy analysis,and the experimental data obtained from a homemade experimental apparatus was applied to verify the reliability of numerical model.Based on the first and second laws of thermodynamics,the effects of flow rate of cooling air(FRCA)and inlet temperature of cooling air(ITCA),as well as the inner diameter of cooling section(IDCS)and height of cooling section(HCS),on the sinter cooling process were analyzed in detail.The results show that the average deviation between the experimental data and calculation values is 4.93%,and the model reliability is verified.The enthalpy exergy of outlet air tends to increase first and then decrease with increasing the FRCA and ITCA,while increasing the IDCS only leads to the increase in enthalpy exergy of outlet air.For a given operational condition,the enthalpy exergy of outlet air can reach a maximum value with increasing the HCS.The vertical tank could obtain the maximum enthalpy exergy of outlet air through the adjustments of FRCA and ITCA,as well as the HCS.

关键词： Sinter Waste heat recovery Porous medium-Energy analysis Exergy analysis Vertical bank

microRNAs: critical regulators in Th17 cells and players in diseases

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Cellular & Molecular Immunology 2010年第3期7卷 175-181页

作者： Bin Wei Gang Pei Laboratory of Molecular Cell Biology Institute of Biochemistry and Cell BiologyShanghai Institutes for Biological SciencesChinese Academy of SciencesShanghaiChina

microRNAs are a novel group of small,conserved,non-coding RNA molecules that are present in all species.These molecules post-transcriptionally regulate gene expression by targeting mRNAs for degradation or by repressing the translation of the mRNAs.A good understanding of miRNA-mediated gene regulation is critical to gain a comprehensive view of many physiological processes and disease states.Emerging evidence demonstrates that miRNAs play an important role in the differentiation and function of the adaptive immune system.This review provides an overview of the diverse functions of miRNAs in modulating immune responses and in immune cell development,particularly the development of Th17 cells,and explores the involvement of miRNAs in several autoimmune diseases including multiple sclerosis(MS),rheumatoid arthritis(RA),inflammatory bowel disease(IBD)and diabetes.

关键词： autoimmune diseases microRNAs Th17 cells

Potential of performance improvement of concentrated solar power plants by optimizing the parabolic trough receiver

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Frontiers in Energy 2020年第4期14卷 867-881页

作者： Honglun YANG Qiliang WANG Jingyu CAO Gang Pei Jing LI Department of Thermal Science and Energy Engineering University of Science and Technology of ChinaHefei 230026China

This paper proposes a comprehensive thermodynamic and economic model to predict and compare the performance of concentrated solar power plants with traditional and novel receivers with different configurations involving operating temperatures and locations.The simulation results reveal that power plants with novel receivers exhibit a superior thermodynamic and economic performance compared with traditional receivers.The annual electricity productions of power plants with novel receivers in Phoenix,Sevilla,and Tuotuohe are 8.5%,10.5%,and 14.4%higher than those with traditional receivers at the outlet temperature of 550℃.The levelized cost of electricity of power plants with double-selectivecoated receivers can be decreased by 6.9%,8.5%,and 11.6%.In Phoenix,the optimal operating temperature of the power plants is improved from 500℃to 560℃by employing a novel receiver.Furthermore,the sensitivity analysis of the receiver heat loss,solar absorption,and freeze protection temperature is also conducted to analyze the general rule of influence of the receiver performance on power plants performance.Solar absorption has a positive contribution to annual electricity productions,whereas heat loss and freeze protection temperature have a negative effect on electricity outputs.The results indicate that the novel receiver coupled with low melting temperature molten salt is the best configuration for improving the overall performance of the power plants.

关键词： concentrated solar power parabolic trough receiver heat loss solar energy annual performance

A spectrally selective surface structure for combined photothermic conversion and radiative sky cooling

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Frontiers in Energy 2020年第4期14卷 882-888页

作者： Bin ZHAO Xianze AO Nuo CHEN Qingdong XUAN Mingke HU Gang Pei Department of Thermal Science and Energy Engineering University of Science and Technology of ChinaHefei 230027China

The sun and outer space are the ultimate heat and cold sources for the earth,respectively.They have significant potential for renewable energy harvesting.In this paper,a spectrally selective surface structure that has a planar polydimethylsiloxane layer covering a solar absorber is conceptually proposed and optically designed for the combination of photothermic conversion(PT)and nighttime radiative sky cooling(RC).An optical simulation is conducted whose result shows that the designed surface structure(i.e.,PT-RC surface structure)has a strong solar absorption coefficient of 0.92 and simultaneously emits as a mid-infrared spectral-selective emitter with an average emissivity of 0.84 within the atmospheric window.A thermal analysis prediction reveals that the designed PTRC surface structure can be heated to 79.1℃higher than the ambient temperature in the daytime and passively cooled below the ambient temperature of approximately 10℃in the nighttime,indicating that the designed PT-RC surface structure has the potential for integrated PT conversion and nighttime RC utilization.

关键词： solar energy photothennic conversion radiative sky cooling spectral selectivity multilayer film

Enhanced Crystallization Kinetics of PLLA by Ethoxycarbonyl Ionic Liquid Modified Graphene

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Chinese Journal of Polymer Science 2019年第3期37卷 243-252页

作者： pei Xu Zhao-pei Cui gang Ruan Yun-Sheng Ding Department of Polymer Science and Engineering School of Chemistry and Chemical Engineering and Anhui Key Laboratory of Advanced Functional Materials and Devices Hefei University of Technology

To investigate the performance of graphene(Gra) modified with ethoxycarbonyl ionic liquid(IL), chain mobility and crystallization kinetics of poly(L-lactic acid)(PLLA), a series of PLLA nanocomposites have been prepared using solution-cast method.IL can improve the dispersion of Gra in PLLA matrix and the samples containing IL have higher growth rate of PLLA spherulite than neat PLLA does. PLLA/IL/Gra and PLLA/2 Gra exhibit the same relaxation strength and time of αN relaxation that corresponds to the longest normal mode motion at 110-140 °C. PLLA/IL/Gra shows a faster crystallization rate than PLLA/2 Gra does, which might be attributed to the Gra-imidazolium cation interaction in IL modified Gra, the significant dispersion effect of IL at Gra surface, and the increase of nuclei density of PLLA/IL/Gra.

关键词： Ionic liquid Graphene PLLA Crystallization Dielectric behavior

Thermal performance evaluation of subcritical organic Rankine cycle for waste heat recovery from sinter annular cooler

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Journal of Iron and Steel Research(International) 2020年第3期27卷 248-258页

作者： Jun-sheng Feng Guang-tao Gao Yousef NDabwan Gang Pei Hui Dong School of Environment and Energy Engineering Anhui Jianzhu UniversityHefei 230026AnhuiChina School of Engineering and Science University of Science and Technology of ChinaHefei 230026AnhuiChina School of Metallurgy Northeastern UniversityShenyang 110819LiaoningChina

The sinter cooling flue gas expelled from the end of an annular cooler was taken as the heat source of an organic Rankine cycle(ORC)system,and R123,R245fa,R600,R601 and R601a were selected as the working fluids of the ORC system.The effects of evaporation temperature and superheat degree of working fluid,as well as the pinch point temperature difference in the evaporator on the system thermal performance,were analyzed in detail.The results show that the system net output power and exergy efficiency for different working fluids first increase and then decrease with an increase in the evaporation temperature and decrease with an increase in the superheat degree and pinch point temperature difference.The change in pinch point temperature difference has no effect on the system thermal efficiency.For a given operational condition,the system thermal efficiency and exergy efficiency of R 123 are the maximum,while the system total irreversible loss of R245fa is the maximum.When the evaporation temperature is greater than 110°C,the system net output power of R600 is the maximum.The ORC system could obtain the maximum net output power and exergy efficiency through the adjustment of evaporation temperature of working fluid.

关键词： Sinter Waste heat recovery Organic Rankine cycle Fluid selection Performance evaluation

Facilely anchoring Cu_(2)O nanoparticles on mesoporous TiO_(2)nanorods for enhanced photocatalytic CO_(2)reduction through efficient charge transfer

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Chinese Chemical Letters 2022年第8期33卷 3709-3712页

作者： Ge Yang pei Qiu Jinyan Xiong Xueteng Zhu gang Cheng School of Chemistry and Environmental Engineering Wuhan Institute of TechnologyDonghu New&High Technology Development ZoneWuhan 430205China College of Chemistry and Chemical Engineering Wuhan Textile UniversityWuhan 430200China

Semiconductor-employed photocatalytic CO_(2) reduction has been regarded as a promising approach for environmental-friendly conversion of CO_(2) into solar fuels.Herein,TiO_(2)/Cu_(2)O composite nanorods have been successfully fabricated by a facile chemical reduction method and applied for photocatalytic CO_(2) reduction.The composition and structure characterization indicates that the Cu_(2)O nanoparticles are coupled with TiO_(2) nanorods with an intimate contact.Under light illumination,all the TiO_(2)/Cu_(2)O composite nanorods enhance the photocatalytic CO_(2)reduction.In particular,the TiO_(2)/Cu_(2)O-15%sample exhibits the highest CH_(4)yield(1.35μmol g^(-1)h^(-1)) within 4 h irradiation,and it is 3.07 and 15 times higher than that of pristine TiO_(2)nanorods and Cu_(2)O nanoparticles,respectively.The enhanced photoreduction capability of the TiO_(2)/Cu_(2)O-15%is attributed to the intimate construction of Cu_(2)O nanoparticles on TiO_(2) nanorods with formed p-n junction to accelerate the separation of photogenerated electron-hole pairs.This work provides a reference for rational design of a p-n heterojunction photocatalyst for CO_(2) photoreduction.

关键词： TiO_(2)/Cu_(2)O composite Photocatalytic CO_(2)reduction Photocatalysis Charge separation p-n Junction

Chimeric cerebral organoids reveal the essentials of neuronal and astrocytic APOE4 for Alzheimer's tau pathology

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Signal Transduction and Targeted Therapy 2022年第7期7卷 2545-2554页

作者： Shichao Huang Zhen Zhang Junwei Cao Yongchun Yu Gang Pei State Key Laboratory of Cell Biology Shanghai Institute of Biochemistry and Cell BiologyCenter for Excellence in Molecular Cell ScienceChinese Academy of Sciences200031 ShanghaiChina Institutes of Brain Science State Key Laboratory of Medical Neurobiology and Collaborative Innovation Center for Brain ScienceFudan University200032 ShanghaiChina Shanghai Key Laboratory of Signaling and Disease Research Laboratory of Receptor-based BiomedicineThe Collaborative Innovation Center for Brain ScienceSchool of Life Sciences and TechnologyTongji UniversityShanghaiChina Institute for Stem Cell and Regeneration Chinese Academy of SciencesBeijingChina

The apolipoprotein E4(APOE4)genotype is one of the strongest genetic risk factors for Alzheimer’s disease(AD),and is generally believed to cause widespread pathological alterations in various types of brain cells.Here,we developed a novel engineering method of creating the chimeric human cerebral organoids(chCOs)to assess the differential roles of APOE4 in neurons and astrocytes.First,the astrogenic factors NFIB and SOX9 were introduced into induced pluripotent stem cells(iPSCs)to accelerate the induction of astrocytes.Then the above induced iPSCs were mixed and cocultured with noninfected iPSCs under the standard culturing condition of cerebral organoids.As anticipated,the functional astrocytes were detected as early as 45 days,and it helped more neurons matured in chCOs in comparation of the control human cerebral organoids(hCOs).More interestingly,this method enabled us to generate chCOs containing neurons and astrocytes with different genotypes,namely APOE3 or APOE4.Then,it was found in chCOs that astrocytic APOE4 already significantly promoted lipid droplet formation and cholesterol accumulation in neurons while both astrocytic and neuronal APOE4 contributed to the maximum effect.Most notably,we observed that the cooccurrence of astrocytic and neuronal APOE4 were required to elevate neuronal phosphorylated tau levels in chCOs while Aβlevels were increased in chCOs with neuronal APOE4.Altogether,our results not only revealed the essence of both neuronal and astrocytic APOE4 for tau pathology,but also suggested chCOs as a valuable pathological model for AD research and drug discovery.

关键词： cerebral alterations neuronal

On the Global Convergence of a Projective Trust Region Algorithm for Nonlinear Equality Constrained Optimization

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Acta Mathematica Sinica,English Series 2018年第12期34卷 1804-1828页

作者： Yong Gang Pei De Tong ZHU Mathematics and Information Science He 'nan Normal University Xinxiang 453007 P. R. China Mathematics and Science College Shanghai Normal University Shanghai 200234 P. R. China

A trust-region sequential quadratic programming （SQP） method is developed and analyzed for the solution of smooth equality constrained optimization problems. The trust-region SQP algorithm is based on filter line search technique and a composite-step approach, which decomposes the overall step as sum of a vertical step and a horizontal step. The algorithm includes critical modifications of horizontal step computation. One orthogonal projective matrix of the Jacobian of constraint functions is employed in trust-region subproblems. The orthogonal projection gives the null space of the trans- position of the Jacobian of the constraint function. Theoretical analysis shows that the new algorithm retains the global convergence to the first-order critical points under rather general conditions. The preliminary numerical results are reported.

关键词： Sequential quadratic programming trust-region filter line search projection global convergence