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Science China Chemistry 2009年第5期52卷 670-675页

作者： ZHOU cheng wen XiangHua The State Key Joint Laboratory of Environmental Simulation and Pollution Control Department of Environment Science and EngineeringTsinghua UniversityBeijing 100084China

In order to achieve an innovative strategy to renew the biomass of Phanerochaete chrysosporium in an immobilized growth system which can maintain white-rot fungi biomass, a novel knotted cotton-thread carrier was designed and made. By using a high-speed stirring apparatus under the conditions of 1400 r/min stirring speed for 6 min, mycelia immobilized on the knotted cotton-thread carriers were exfoliated completely and homogenized to a proper size. Furthermore, the homogenized mycelia from the immobilized mycelia can resume their growth on the knotted cotton-thread carriers in agitated flask cultures. The average regrowth biomass on the new carriers and the reused carriers was 0.0171 g/carrier and 0.0314 g/carrier, respectively. It proves that the knotted cotton-thread carrier performs perfectly in homogening the immobilized mycelia to achieve the biomass renewal of P. chrysosporium in an immobilized growth system.

关键词： knotted cotton-thread carrier biomass renewal immobilization homogenizing Phanerochaete chrysosporium

Supercritical gasification for the treatment of o-cresol wastewater

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Journal of Environmental Sciences 2006年第4期18卷 644-649页

作者： WEI chao-hai HU cheng-sheng WU chao-fei YAN Bo College of Environmental Science and Technology South China University of Technology Guangzhou 510640 China

The supercritical water gasification of phenolic wastewater without oxidant was performed to degrade pollutants and produce hydrogen-enriched gases. The simulated o-cresol wastewater was gasified at 440-650℃ and 27.6 MPa in a continuous Inconel 625 reactor with the residence time of 0.42-1.25 min. The influence of the reaction temperature, residence time, pressure, catalyst, oxidant and the pollutant concentration on the gasification efficiency was investigated. Higher temperature and longer residence time enhanced the o-cresol gasification. The TOC removal rate and hydrogen gasification rate were 90.6% and 194.6%, respectively, at the temperature of 650℃ and the residence time of 0.83 min. The product gas was mainly composed of H2, CO2, CFL and CO, among which the total molar percentage of H2 and CFL was higher than 50%. The gasification efficiency decreased with the pollutant concentration increasing. Both the catalyst and oxidant could accelerate the hydrocarbon gasification at a lower reaction temperature, in which the catalyst promoted H2 production and the oxidant enhanced CO2 generation. The intermediates of liquid effluents were analyzed and phenol was found to be the main composition. The results indicate that the supercritical gasification is a promising way for the treatment of hazardous organic wastewater.

关键词： supercritical water gasification o-cresol hydrogen-enriched gas wastewater treatment

Association between serum Sestrin2 level and diabetic peripheral neuropathy in type 2 diabetic patients

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World Journal of Clinical Cases 2021年第36期9卷 11156-11164页

作者： En-wen Mao Xue-Bing cheng wen-chao Li cheng-Xia Kan Na Huang Hong-Sheng Wang Ning-Ning Hou Xiao-Dong Sun Department of Endocrinology and Metabolism Clinical Research CenterThe Affiliated Hospital of Weifang Medical UniversityWeifang 261031Shandong ProvinceChina Department of Endocrinology and Metabolism The Affiliated Hospital of Weifang Medical UniversityWeifang 261031Shandong ProvinceChina

BACKGROUND Diabetic peripheral neuropathy(DPN)is a chronic and serious microvascular complication of diabetes linked to redox ***2,a novel inducible stress protein,participates in glucose metabolic regulation and redox ***,the association between serum Sestrin2 and DPN is *** To explore the association between serum Sestrin2 and DPN in patients with type 2 diabetes mellitus(T2DM).METHODS A total of 96 T2DM patients and 39 healthy volunteers,matched by age and sex,participated in this cross-sectional *** features and metabolic indices were *** Sestrin2 was measured by *** association between Sestrin2 and DPN was *** and logistic regression analyses were used to evaluate the associations of different metabolic indices with Sestrin2 and *** The 96 patients with T2DM were divided into DPN(n=47)and patients without DPN(n=49).Serum Sestrin2 was significantly lower in healthy volunteers than in all T2DM patients combined[9.10(5.41-13.53)ng/mL vs 12.75(7.44-23.80)ng/mL,P<0.01].T2DM patients without DPN also had significantly higher levels of Sestrin2 than healthy volunteers[14.58(7.93-26.62)ng/mL vs 9.10(5.41-13.53)ng/mL,P<0.01].However,T2DM patients with DPN had lower circulating Sestrin2 levels compared to T2DM patients without DPN[9.86(6.72-21.71)ng/mL vs 14.58(7.93-26.62)ng/mL,respectively,P<0.01].Bivariate correlation analysis revealed that serum Sestrin2 was positively correlated with body mass index(r=0.672,P=0.000),hemoglobin A1c(HbA1c)(r=0.292,P=0.000),serum creatinine(r=0.206,P=0.016),triglycerides(r=0.731,P=0.000),and fasting glucose(r=0.202,P=0.040),and negatively associated with estimated glomerular filtration rate(r=-0.230,P=0.007).After adjustment for sex,age,HbA1c,and diabetes duration,multiple regression analysis revealed that Sestrin2 was independently correlated with body mass index and triglyceride levels(P=0.000).Logistic regression analyses indicated that Sestri

关键词： Sestrin2 Diabetic peripheral neuropathy Type 2 diabetes mellitus Diabetic

Reduction of dinitrogen to ammonia on doped three-atom clusters Nb_(2)M(M=Sc to Cu & Y to Ag)

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Rare Metals 2024年第8期43卷 3810-3818页

作者： Ran cheng chao-Nan Cui Zhi-Xun Luo Beijing National Laboratory for Molecular Science(BNLMS) State Key Laboratory for Structural Chemistry of Unstable and Stable SpeciesInstitute of ChemistryChinese Academy of SciencesBeijing 100190China School of Chemical Science University of Chinese Academy of SciencesBeijing 100049China

Catalytic reduction of dinitrogen to ammonia under mild conditions remains an attractive topic for the purpose of lowering energy ***-atom metal clusters have been proved an ideal model to explore highly efficient catalysts taking advantage of unique geometric/electronic structures and cooperative active *** a study of N2 activation and reduction on seventeen bimetallic Nb_2M(M=Sc to Cu,and Y to Ag) clusters was *** key processes for ammonia fixation(namely nitrogen activation,hydrogenation,and ammonia desorption) are fully studied,and three preferred systems(Nb_2Ni,Nb_2Rh and Nb_2Pd) are highlighted with outstanding catalytic *** d-σ and d-π~* orbital hybridizations between these metal clusters and N_(2) were demonstrated and the internal association with the N≡N bond activation was *** examining the ammonia synthesis on four chosen Nb_(2)M clusters(M=Fe,Ni,Rh and Pd),it can be elucidated that the distal pathway is more favorable than the alternative pathway in these *** work not only clarifies the N_(2) reduction on the bimetallic Nb_(2)M clusters,but also guides efficient bimetallic catalyst design.

关键词： Three-atom cluster catalysis Three-criteria strategy Nitrogen fixation Ammonia synthesis Theoretical calculations

Integrated Configuration and Control Strategy for PV Generation in Railway Traction Power Supply Systems

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CSEE Journal of Power and Energy Systems 2022年第6期8卷 1603-1612页

作者： Peng cheng Huiwen Kong chao Wu Jing Ma China Institute of Energy and Transportation Integrated Development North China Electric Power UniversityBeijing 102206China Department of Electrical Engineering Shanghai Jiao Tong UniversityShanghai200240China department of energy Aalborg UniversityAalborg 9220Denmark

Recently,electric railways have experienced a rapid development causing an increasing power *** to the flexible installation available at trackside land along railways,photovoltaic(PV)generation is suggested as an extension to the traction power supply system(TPSS)in ***,this paper proposes a three-phase integrated configuration for PV generation connected to a two-phase traction network and the on-site consumption of solar resources alongside *** this configuration,another inverse V/V transformer is used to maintain a balanced three-phase low voltage(LV)AC bus from a two-phase traction *** is more convenient for accessing PV generation ***,in order to mitigate the negative sequence currents caused by electric trains,an individual phase current(IPC)control strategy for PV converters is developed for power quality *** can not only supply the locomotive with asymmetrical currents,but also provide feedback to the grid through symmetrical *** the implementation and calculations are conducted in the three-phase stationary reference frame without any sequence extracting and power ***,simulation results are presented to validate the effectiveness of the proposed IPC control strategy.

关键词： Current control individual phase current(IPC) photovoltaic(PV)converter railway traction network

Recent Advances on the Corrosion Resistance of Low-Density Steel:A Review

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Acta Metallurgica Sinica(English Letters) 2022年第7期35卷 1055-1067页

作者： chao Liu Yilun Li Xuequn cheng Xiaogang Li Institute of Advanced Materials and Technology University of Science and Technology BeijingBeijing 100083China National Materials Corrosion and Protection Data Center University of Science and Technology BeijingBeijing 100083China

This paper reviews the previous literature on the alloy composition design of low-density steel(LDS),focusing on the eff ect of Al,Mn,Ni,and other alloy elements on the formation of the steel matrix and second phase,and provides classifi *** microstructure of LDS after processing includes the matrix structure,к-carbide,and B2(FeAl,NiAl,or MnAl)phase of ferritic LDS,austenitic LDS,and dual-phase *** infl uence of alloy elements on the corrosion resistance of LDS is derived from the addition of Al and Mn for ***,the infl uence of Cr and Mo addition on the corrosion resistance improvement was *** electrochemical properties of the corrosion process in LDS are ***,the microstructure of LDS aff ects the corrosion resistance properties including pitting corrosion,hydrogen embrittlement,and SCC(stress corrosion cracking).Finally,future research directions are proposed.

关键词： Low-density steel Alloy element adjustment Microstructure Corrosion resistance

Role of Martensite Structural Characteristics on Corrosion Features in Ni-Advanced Dual-Phase Low-Alloy Steels

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Acta Metallurgica Sinica(English Letters) 2021年第6期34卷 802-812页

作者： chao Hai Xuequn cheng Cuiwei Du Xiaogang Li Institute of Advanced Materials and Technology University of Science and Technology BeijingBeijing 100083China

The relationship between the corrosion resistance and martensite structure of Ni-advanced dual-phase weathering steel was studied using transmission electron microscopy,scanning electron microscopy,electrochemical analysis,and atomic force *** investigations indicate that the final microstructure of the dual-phase weathering steel was composed of a large amount of low-carbon lath martensite distributed in the ferrite *** potential of the martensite phase is higher than that of ferrite,which acts as a *** the martensite volume fraction in the Ni-advanced dual-phase weathering steel increased,the corrosion rate increased owing to the greater galvanic couple formed between the ferrite and martensite from the increasing ratio of the cathode area to the anode *** addition,this work provides a method to obtain advanced weathering steel with improved mechanical properties and corrosion resistance.

关键词： Weathering steel Corrosion Martensite Dual phase Galvanic couple

Microstructure and property of laser additive manufactured alloy Ti-6Al-2V-1.5Mo-0.5Zr-0.3Si after aged at different temperatures

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Rare Metals 2024年第5期43卷 2275-2281页

作者： Guo-chao Li Xu cheng Hua-Ming Wang National Engineering Laboratory of Additive Manufacturing for Large Metallic Components and Engineering Research Center of Ministry of Education on Laser Direct Manufacturing for Large Metallic Components School of Materials Science and EngineeringBeihang UniversityBeijing 100191China

The solid solution and aging treatment for conventional manufacturing processes might not be suitable for laser additive manufactured titanium alloys due to the different lamellar *** this study,the influence of aging temperatures(600,700 and 800°C)on microstructure and mechanical properties of titanium alloy Ti-6Al-2V-1.5Mo-0.5Zr-0.3Si was *** results indicate that after solid solution treatment at 970°C followed by water quenching,the alloy mainly consists of coarsening lamellar a phase in martensite α' *** at 600°C will not change the size of primary lamellar α phase but lead to huge amount of secondary a phases(α_(s))generating with very fine *** increasing the aging temperature,the number of α_(s) decreases but with coarsened *** aged at 800°C,the width of the asphase reaches 350 nm,almost 7 times wider than that aged at 600°*** changing size of α_(s) obviously influences the property of the *** fine α_(s) leads to high strength and microhardness but low plasticity,and specimen aged at 700°C with suitable assize has the best comprehensive properties.

关键词： α+βtitanium alloy Laser additive manufacturing Solid solution and aging treatment Microstructure Room temperature tensile property

Effects of Pilot Fuel Ratio on Combustion Process:Flow Field Structure and Pollutant Emissions

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Journal of Thermal Science 2023年第6期32卷 2321-2335页

作者： ZONG chao JI Chenzhen cheng Jiaying ZHU Tong Postdoctoral Station of Mechanical Engineering Tongji UniversityShanghai201804China School of Mechanical Engineering Tongji UniversityShanghai201804China

As the only controllable means of a micro gas turbine(MGT)combustor during unit operation,pilot fuel ratio(PFR)is the key to achieving stable combustion and low pollutant *** paper discusses the influence of PFR on the inner flow field structure and pollutant *** steady-state three-dimensional RANS method with a 40-step reduced methane-air kinetics mechanism is used to study the reaction flow field and species field with PFR of 9.0%,12.7%,15.2%and 17.6%.Results show that,with the decrease in PFR,the axial velocity and temperature near the central axis of the combustion chamber show a tendency to decrease.A similar separation phenomenon occurred in the core pyrolysis reaction zone(measured by HCO)and oxidation zone(measured by OH),which is more conducive to promoting the oxidation of *** quantitative effect of the pilot flame on nitrogen oxides(NO_(x))was separated by using inert gas instead of nitrogen in combustion *** was found that the NOx produced by the pilot flame under the operation condition with a PFR of 9.0%was 3.2×10^(−6),accounting for 17.4%of the total NOx emission,which was twice that of PFR.

关键词： micro gas turbine pilot fuel ratio flow field structure carbon monoxide nitrogen oxide

Flow characteristics and bubble statistics during the fragmentation process of the ingested main cavity in plunging breaking waves

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Journal of Hydrodynamics 2024年第3期36卷 546-555页

作者： wen-bin Zhang Wei-wen Zhao De-cheng Wan Computational Marine Hydrodynamics Lab(CMHL) School of Naval ArchitectureOcean and Civil EngineeringShanghai Jiao Tong UniversityShanghai200240China

Plunging breaking waves play an important role in the exchange of heat,momentum,and mass between the atmosphere and *** this paper,a series of direct numerical simulations is conducted to investigate the fragmentation process of the ingested main cavity in plunging breaking *** two-phase Navier-Stokes equations are solved using the finite-volume method based on adaptive refinement *** free surface is captured using a geometrical volume of fluid *** 2-D,3-D simulations are *** flow fields at different stages of wave breaking are presented and quantitative analysis for bubbles is *** 2-D instantaneous vorticity field and local velocity field are visualized to discuss the general flow characteristics during the fragmentation *** a 2-D parametric study is conducted to investigate the differences in the flow characteristics during the fragmentation process under different wave parameters including initial wave steepness(ε),Bond number(Bo),and Reynolds number(Re).3-D vortex structures are shown to further investigate the mechanisms behind the differences in the flow *** bubble size distributions under two different initial wave steepness are also discussed with their relationship to the fragmentation process of the ingested main *** research offers a significant understanding of the distinct procedures and fundamental dynamics involved in wave breaking,enhancing our comprehension of this intricate event.

关键词： Plunging breaking waves multiphase flow bubble statistics