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核心机驱动风扇级可变弯度导叶设计方法

推进技术 2016年第10期37卷 1855-1859页

作者：王前胡骏屠宝锋严伟南京航空航天大学能源与动力学院江苏省航空动力系统重点实验室江苏南京210016

为设计出适用于核心机驱动风扇级的可变弯度导叶,在基础叶型设计的基础上,采用数值计算方法详细分析了缝隙形式以及设计点的选取对可变弯度导叶性能的影响。计算结果表明:不同的气流转折角对应着不同的最佳基础叶型;在缝隙设计中采用Coa... 详细信息

为设计出适用于核心机驱动风扇级的可变弯度导叶,在基础叶型设计的基础上,采用数值计算方法详细分析了缝隙形式以及设计点的选取对可变弯度导叶性能的影响。计算结果表明:不同的气流转折角对应着不同的最佳基础叶型;在缝隙设计中采用Coanda型线可以有效提高泄漏流的附壁性能,抑制缝隙后附面层的发展,提高可变弯度导叶性能;可变弯度导叶出口气流角变化范围较大,设计点的选取对可变弯度导叶的性能有显著的影响。

关键词：核心机驱动风扇级可变弯度导叶基础叶型 Coanda效应设计点选取

IMMOBILIZATION OF LIPASE FROM PORCINE PANCREAS ON AMINATED POLY(METHYL ACRYLATE)COPOLYMERS

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Chinese Chemical Letters 1992年第9期3卷 749-752页

作者： Min Qin LI Zhi Dong XIE feng wei bao Dao Bin WANG Bing Lin HE Institute of Polymer Chemistry,Nankai University,Tianjin 300071

Series of poly(methyl acrylate)copolymers of different pore struc- tures were synthesized and directly aminated by polyethylene polyamine. The lipace from porcine pancreas was adsorbed on these *** activity of immobilized lipase was infiuenced by different polyethylene polyamines,the degree of cross-linking and the relative rolume of pore-generating solvent.

关键词： high 口口 IMMOBILIZATION OF LIPASE FROM PORCINE PANCREAS ON AMINATED POLY METHYL ACRYLATE)COPOLYMERS

Metal-organic frameworks with dinuclear metal centers for synergistically boosting CO2 photoreduction

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Science China Chemistry 2025年第1期68卷 201-208页

作者： Hui-feng Wang Wen-Jie Shi Yu-Xin Yang bao-Xia Dong Tong-Bu Lu Di-Chang Zhong School of Chemistry and Chemical Engineering Yangzhou University Institute for New Energy Materials and Low Carbon Technologies School of Materials Science and Engineering Tianjin University of Technology

Dinuclear metal synergistic catalysis （DMSC） has been proved powerful in boosting CO2reduction,while this has not been achieved in heterogeneous catalysts with long-range order *** this study,we,by introduction of metal catalytic centers into an indium-based metal-organic framework （MOF）,obtained a series of isostructural In-MOFs,including three MOFs with mononuclear metal catalytic center （M-In）,three MOFs with dinuclear homometallic catalytic centers （MM-In）,and three MOFs with dinuclear heterometallic catalytic centers (MM’-In,M/M’=Co（II）,Ni（II）,Zn（II）).It was found that all these MOFs can serve as catalysts for photochemical CO2reduction to *** with M-In,the catalytic activities of MM-In were obviously enhanced,and that of MM’-In was further significantly *** example,the CO yield of Co Zn-In reaches a record value of 12,700μmol g-1h-1,which is 4.0,8.1,9.4,and 18.6-fold higher than that of Co Co-In,Zn Zn-In,Co-In,and Zn-In,***,the catalytic activities of Co Ni-In and Ni Zn-In also show different fold increase than those of corresponding dinuclear homometallic and mononuclear metallic *** results of control experiments and theoretical calculation reveal that the higher catalytic activities of MM-In over M-In can be ascribed to the DMSC effect,and the higher catalytic activity of MM’-In over MM-In can be ascribed to the strengthened DMSC *** work reveals the relationship between DMSC effect and bimetal centers in CO2reduction,which provides new insights into the DMSC and paves a new way to design highly active catalysts for photochemical CO2reduction.

关键词： metal-organic frameworks dinuclear metal centers synergistic catalysis CO2 reduction photocatalysis

Modular assembly of Co4-thiacalix[4]arene units and Keggin-type SiW12O40 for visible-light photothermal conversion

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Tungsten 2025年第1期7卷 112-119页

作者： Jia-Hui Li Qing Zhao Dong-Ao Mao Kun Zhou bao-Kuan Chen Yan-feng Bi School of Petrochemical Engineering Liaoning Petrochemical University

The construction of metal-organic coordination clusters（MCCs） using modular secondary building units is an important method for preparing functional *** this study,two new MCCs modularly assembled from Keggin-type {SiW12O40}H4TC4A=p-tert-Butylthiacalix[4]arene(SiW12) units and thiacalixarene-supported Co4-thiacalix[4]arene(Co4-TC4A polynuclear second-building units（PSBUs,H4TC4A=p-tert-Butylthiacalix[4]arene） are *** two MCCs,abbreviated as Co4-SiW12and Co8-SiW12,were structurally characterized by single-crystal X-ray *** Co4-SiW12is a supramolecular structure involving cation-anion interactions between Co4-TC4A PSBUs and ***8-SiW12features "barbell-like" shapes with two Co4-TC4A coordinatively linked to a Keggin-type SiW12unit on opposite via W-O_t-Co *** coordination of Co4-TC4A to SiW12in Co8-SiW12resulted in significantly improved photothermal conversion performances compared with Co4-SiW12and pure SiW12or ***-gap determination and photophysical analysis combined with density functional theory calculations indicated the binding mode between Co4-TC4A PSBUs and SiW12,which considerably influences the way of electron transport and the conversion ability of visible light to heat.

关键词： Modular construction Photothermal conversion Polyoxometalate Thiacalixarene

Interaction of major facilitator superfamily domain containing 2A with the blood-brain barrier

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Neural Regeneration Research 2025年第8期20卷 2133-2152页

作者： Yilun Ma Taiwei Dong Fei Luan Juanjuan Yang feng Miao Peifeng wei College of Pharmacy and First Clinical Medical College Shaanxi University of Chinese MedicineXianyangShaanxi ProvinceChina National Drug Clinical Trial Agency The Second Affiliated Hospital of Shaanxi University of Chinese Medicine/Xixian New District Central HospitalXi′anShaanxi ProvinceChina

The functional and structural integrity of the blood-brain barrier is crucial in maintaining homeostasis in the brain microenvironment;however,the molecular mechanisms underlying the formation and function of the blood-brain barrier remain poorly *** major facilitator superfamily domain containing 2A has been identified as a key regulator of blood-brain barrier *** plays a critical role in promoting and maintaining the formation and functional stability of the blood-brain barrier,in addition to the transport of lipids,such as docosahexaenoic acid,across the blood-brain ***,an increasing number of studies have suggested that major facilitator superfamily domain containing 2A is involved in the molecular mechanisms of blood-brain barrier dysfunction in a variety of neurological diseases;however,little is known regarding the mechanisms by which major facilitator superfamily domain containing 2A affects the blood-brain *** paper provides a comprehensive and systematic review of the close relationship between major facilitator superfamily domain containing 2A proteins and the blood-brain barrier,including their basic structures and functions,cross-linking between major facilitator superfamily domain containing 2A and the blood-brain barrier,and the in-depth studies on lipid transport and the regulation of blood-brain barrier *** comprehensive systematic review contributes to an in-depth understanding of the important role of major facilitator superfamily domain containing 2A proteins in maintaining the structure and function of the blood-brain barrier and the research progress to *** will not only help to elucidate the pathogenesis of neurological diseases,improve the accuracy of laboratory diagnosis,and optimize clinical treatment strategies,but it may also play an important role in prognostic *** addition,the effects of major facilitator superfamily domain containing 2A on blood-brain barrier lea

关键词： blood-brain barrier(BBB) caveolin-1 central nervous system docosahexaenoic acid endothelial cells lysophosphatidylcholine major facilitator superfamily domain containing 2A(MFSD2A) transcytosis

On Uniform Decay of Solutions for Extensible Beam Equation with Strong Damping

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Chinese Quarterly Journal of Mathematics 2014年第1期29卷 151-158页

作者： feng bao-wei ZHANG Ming LIANG Tie-wang LI Hai-yan College of Economic Mathematics Southwestern University of Finance and Economics Chengdu611130 China College of Information Science and Technology Donghua University Shanghai 201620China Department of Inforwation and Arts Design Henan Forestry Vocational College Luoyang471002 China

This paper investigates the existence and uniform decay of global solutions to the initial and boundary value problem with clamped boundary conditions for a nonlinear beam equation with a strong damping.

关键词： extensible beam equation global existence uniqueness uniform decay

Depression mechanism of sulfite ions on sphalerite and Pb^(2+)activated sphalerite in the flotation separation of galena from sphalerite

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International Journal of Minerals,Metallurgy and Materials 2025年第2期32卷 335-345页

作者： feng Zhang Chenyang Zhang Linlin Wu wei Sun Hongliang Zhang Jianhua Chen Yong Pei Songjiang Li Engineering Research Center of Ministry of Education for Carbon Emission Reduction in Metal Resource Exploitation and Utilization Hunan International Joint Research Center for Efficient and Clean Utilization of Critical Metal Mineral ResourcesSchool of Minerals Processing and BioengineeringCentral South UniversityChangsha 410083China State Key Laboratory of Mineral Processing Beijing General Research Institute of Mining&MetallurgyBeijing 100160China Hunan Provincial Key Laboratory of Micro&Nano Materials Interfaces Science College of Chemistry and Chemical EngineeringCentral South UniversityChangsha 410083China School of Resources Environment and MaterialsGuangxi UniversityNanning 530004China Department of Chemistry Xiangtan UniversityXiangtan 411105China China Railway Resource Group Co.Ltd Beijing 102300China

The depression mechanism of sulfite ions on sphalerite and Pb^(2+)activated sphalerite in the flotation separation of galena from sphalerite still lacked in-depth ***,the depression mechanism of sulfite ions on sphalerite and Pb^(2+)activated sphalerite in the flotation separation of galena from sphalerite was further systematically investigated with experiments and density functional theory(DFT)*** X-ray photoelectric spectroscopy(XPS)results,DFT calculation results,and frontier molecular orbital analysis indicated that sulfite ions were difficult to be adsorbed on sphalerite surface,suggesting that sulfite ions achieved depression effects on sphalerite through other non-adsorption ***,the oxygen content in the surface of sphalerite treated with sulfite ions in creased,which enhanced the hydrophilicity of the sphalerite and further increased the difference in hydrophilicity between sphalerite and ***,sulfite ions were chelated with lead ions to form PbSO_(3)in *** hydrophilic PbSO_(3)was more easily adsorbed on sphalerite than *** interaction between sulfite ions and lead ions could effectively inhibit the activation of *** addition the UV spectrum showed that after adding sulfite ions,the peak of perxanthate in the sphalerite treated xanthate solution was significantly stronger than that in the galena with xanthate solution,indicating that xanthate interacted more readily with sulfite ions and oxygen mo lecules within the sphalerite system,leading to the formation of ***,sulfite ions hardly depressed the flotation of ga lena and could promote the flotation of galena to some *** study deepened the understanding of the depression mechanism o sulfite ions on sphalerite and Pb^(2+)activated sphalerite.

关键词： sphalerite galena sulfite ion density functional theory depression mechanism

跨越新生适应障碍:中国大学入学教育的运行机制及其成效

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华东师范大学学报（教育科学版） 2025年第1期43卷 49-66页

作者：鲍威何元皓何峰厦门大学高等教育发展中心厦门361005 厦门大学教育研究院厦门361005 北京大学教育经济研究所北京100871 北京大学未来教育管理研究中心北京100871 北京大学研究生院北京100871

入学教育是帮助新生适应大学环境、形成自我与社会认知、充分融入大学生活的重要桥梁。鉴于我国大学新生普遍存在学术性、社会性双重适应障碍,在通过国际比较清晰认识中国入学教育运行机制特征的基础上,利用全国大一学生调查数据,科学... 详细信息

入学教育是帮助新生适应大学环境、形成自我与社会认知、充分融入大学生活的重要桥梁。鉴于我国大学新生普遍存在学术性、社会性双重适应障碍,在通过国际比较清晰认识中国入学教育运行机制特征的基础上,利用全国大一学生调查数据,科学评估入学教育在缓减新生适应障碍中的干预成效。研究表明,采用长期深度教育形式,传递专业学科认知、学习方法习得、心理健康建设3大教育内容向度的入学教育运行机制,对缓减学生学术性、社会性双重适应障碍具有积极效用。囿于精准化帮扶举措欠缺,入学教育对弱势学生的补偿效应有待加强。结论为完善大学入学教育、保障人才培养质量提供科学启示。

关键词：入学教育大学新生学术性适应社会性适应

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灵香草精油提取及在卷烟芯线加香中的应用

食品工业 2016年第12期37卷 84-87页

作者：潘文亮张祥伟鲍峰伟河北中烟工业有限责任公司技术中心石家庄050050

比较研究了减压水蒸气蒸馏法和亚临界水萃取法对灵香草精油得率、组成以及品质的影响。结果表明,亚临界水萃取法是较为理想的提取灵香草精油的方法。采用亚临界水萃取,压力8 MPa,温度150℃,萃取2 h所得灵香草精油的得率为3.54%。通过GC... 详细信息

比较研究了减压水蒸气蒸馏法和亚临界水萃取法对灵香草精油得率、组成以及品质的影响。结果表明,亚临界水萃取法是较为理想的提取灵香草精油的方法。采用亚临界水萃取,压力8 MPa,温度150℃,萃取2 h所得灵香草精油的得率为3.54%。通过GC-MS共可鉴定出23种挥发性成分,主要成分以小分子酯类、苯乙酮、9,12,15-十八碳三烯酸甲酯、9,12-十八碳二烯酸、十六酸、十七酸、十七酸乙酯和9,12,15-十八碳三烯酸乙酯为主。灵香草精油应用于卷烟芯线加香可增补甜香和果香香韵,降低口腔、喉部刺激性和干燥感,改善口感。

关键词：灵香草亚临界水萃取芯线加香