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The Reduction of Thermal Nitrogen Oxides (NOx) Emission Using Staged combustion in Furnace

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Journal of Thermal Science 1993年第1期2卷 61-69页

作者： h.K.ma D.M.hsieh DepartmentofMechanicalEngineering NationalTaiwanUniversityTaiwanChina DepartmentofMechanicalEnginee

The experimental study described in this paper is to investigate the control of thermal nitrogen oxides emissions from a 2.28 MW gas-fired test furnace. Tests, including changing axial or radial air flow rate, adding cooling water, and adding staged air, were performed to characterize and opimize the fuel-rich burning zone and the fuel-lean burnout zone independently. Detailed measurements of O_2, cO_2, cO, NO and NOx were made at the fuel-rich burning zone and furnace exit. The influence of forming cO, NO and NOx was examined. Results indicated that adding staged air in the fuel-rich burning zone (75 cm from burner) will reduce the mawximum NO and NO_x emissions. Adding cooling water in a right position may further lower the NO and NO_x emissions. In addition, the least formation of thermal nitrogen oxides in the first stooge fuel-rich bunting zone will occur at the stoichiometric ratio's inverse value, (φ_1)^(-1), 0.65 to 0.7.

关键词： reduction of NO_x emission staged combustion furnace.

A novel black TiO2/ZnO nanocone arrays heterojunction on carbon cloth for highly efficient photoelectrochemical performance

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Frontiers of materials Science 2019年第1期13卷 43-53页

作者： Pengcheng WU chang LIU Yan LUO Keliang WU Jianning WU Xuhong GUO Juan h0U Zhiyong LIU School of chemistry and chemical Engineering Shihezi University/Key Laboratory for Green Processing of Chemical Engineering of Xinjiang Bingtuan/Key Laboratory of Materials-Oriented Chemical Engineering of Xinjiang Uygur Autonomous Region/Engineering Research Center of Materials-Oriented Chemical Engineering of Xinjiang BingtuanShihezi 832003China college of Science/Key Laboratory of Ecophysics and Department of Physics of Xinjiang Bingtuan Shihezi 832003China

ZnO nanocone arrays(NcAs)decorated with black TiO2 nanoparticles(BTiO2 NPs)were uniformly anchored on the surface of carbon cloth(cc)directly by a simply electrochemical deposition *** a novel B-TiO2 NPs/ZnO NcAs-cc hierarchical heterostructure was *** displayed superior performance and achieved a higher photocurrent over 0.4 ma·cm^-2 before the onset of the dark current,attributed to the separation of the photogenerated electron-hole *** on the B-TiO2 NPs/ZnO NcAs-cc heterostructure,the catalyst was fabricated for promoting the separation of charge ***,the introduction of Ti^3+ and oxygen vacancies on the surface of TiO2 NPs expanded the absorption band edge and enhanced the electrical conductivity as well as the charge transportation on the catalytic *** indicates that the B-TiO2 NPs/ZnO NcAs-cc composite is beneficial to the improvement of the photoelectrochemical(PEc)activity.

关键词： black TiO2 nanoparticles ZnO nanocones arrays carbon cloth

mproved Zone 1 Top-line Tilting Scheme for Polygonal Distance Protection in the Outgoing Line of Type-4 Wind Parks

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cSEE Journal of Power and Energy Systems 2023年第1期9卷 172-184页

作者： Kaiqi ma hans Kristian høidalen Zhe chen claus Leth Bak Department of Energy Aalborg University9220 AalborgDenmark Department of Electric Power Engineering Norwegian University of Science and TechnologyNO-7491TrondheimNorway

The impedance element in distance protection equipment in the outgoing line of a wind park(WP)may be heavily affected by the fault response of the *** resistive grid faults,relay over-reach(or under-reach)may manifest,depending on the fault current regulating requirements in the specific grid code deployed in WP and the fault *** at potential solution,*** existing zone 1(fast tripping zone,non-delayed)top-line tilting(Z-1-TLT)function in modern numerical relays,this paper first assesses its adaptability under the WP integrated *** the principle of Z-1-TLT itself and fault modeling to the WP,an improved Z-1-TLT scheme is developed,which can actively compensate for the possible relay overreach or under-reach during resistive faults,utilizing relay side fault quantities *** at the needless action of the new Z-1-TLT scheme against certain faults,malfunction risk area detection and dead zone detection are introduced as auxiliary criteria to optimize protective *** results prove the improved Z-1-TLT scheme can effectively improve reliability of distance protection deployed in the WP outgoing line.

关键词： Distance protection fault current regulating requirement grid code relay over-reach(under-reach) wind park zone 1 top-line tilting

Advances in additively manufactured titanium alloys by powder bed fusion and directed energy deposition:Microstructure,defects,and mechanical behavior

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Journal of materials Science & Technology 2024年第16期183卷 32-62页

作者： h.Y.ma J.c.Wang P.Qin Y.J.Liu L.Y.chen L.Q.Wang L.c.Zhang centre for Advanced materials and manufacturing School of EngineeringEdith Cowan University270 Joondalup DriveJoondalupPerthWA 6027SA School of Engineering M050The University of Western Australia35 Stirling HighwayCrawleyPerthWA 6009SA Institute of Metals College of Material Science and EngineeringChangsha University of Science&TechnologyChangsha 410004China School of material Science and Engineering Jiangsu University of Science and TechnologyZhenjiang 212100China State Key Laboratory of Metal matrix composites School of Material Science and EngineeringShanghai Jiao Tong UniversityShanghai 200240China

Ti and its alloys have been broadly adopted across various industries owing to their outstanding proper-ties,such as high strength-to-weight ratio,excellent fatigue performance,exceptional corrosion resistance and so *** manufacturing(AM)is a complement to,rather than a replacement for,traditional manufacturing *** enhances flexibility in fabricating complex components and resolves machin-ing challenges,resulting in reduced lead times for custom ***,owing to distinctions among various AM technologies,Ti alloys fabricated by different AM methods usually present differences in mi-crostructure and defects,which can significantly influence the mechanical performance of built ***,having an in-depth knowledge of the scientific aspects of fabrication and material properties is crucial to achieving high-performance Ti alloys through different AM *** article reviews the mechanical properties of Ti alloys fabricated by two mainstream powder-type AM techniques:powder bed fusion(PBF)and directed energy deposition(DED).The review examines several key aspects,en-compassing phase formation,grain size and morphology,and defects,and provides an in-depth analysis of their influence on the mechanical behaviors of Ti *** review can aid researchers and engi-neers in selecting appropriate PBF or DED methods and optimizing their process parameters to fabricate high-performance Ti alloys for a wide range of industrial applications.

关键词： Powder bed fusion Directed energy deposition Titanium alloys Phase transformation Defects Mechanical property

Solidification pathway and phase transformation behavior in a beta-solidified gamma-TiAl based alloy

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Journal of materials Science & Technology 2019年第11期35卷 2652-2657页

作者： h.Xu X.B.Li W.W.Xing L.Shu Y.c.ma K.Liu Institute of Metal Research Chinese Academy of SciencesShenyang 110016China MIIT Key Laboratory of Advanced Metallic and Intermetallic materials Technology Engineering Research Center of Materials Behavior and DesignMinistry of EducationNanjing University of Science and TechnologyNanjing 210094China

The phase transformation behavior of an as-cast Ti-42Al-5 Mn(at.%)alloy after subsequent quenching from 1380℃to 1000℃was investigated based on the differential thermal analysis(DTA),electron probe micro analyzer-backscattered electrons(EPma-BSE),transmission electron microscope(TEM)and X-ray diffraction(XRD).The results show that,the solidification path can be summarized as follows:Liquid→Liquid+β→β→β→α→β+α+γ→βo+α2+γ→βo+γ+α2/γ→βo+γ+α2/γ+βo,sec,with the phase transformationα→βtemperature(Tβ)=1311℃,phase transformationγ→βtemperature of(Tγsolv)=1231℃,phase transformationα2→αorβo→βtemperature(Tα2→α/Tβo→β)=1168 c,eutectoid temperature(Teut)=1132℃and T(α2/γ→βo,sec)≈1120℃.In comparison with Ti-42 Al alloy,the Teut and Tγsolv are slightly increased while both the Tp is decreased obviously by 5%Mn *** quenched from the temperature of 1380-1260℃,the martensitic transformationβ→α'could occur to form the needlelike martensite structure inβ*** kind of martensitic structure is much obvious with the increase of temperature from 1260℃to 1380℃.When the temperature is below Tγsolv(1231℃),theγgrains would nucleate directly from theβ*** the temperature slightly lower than T(eut)(1132℃),the dottedβ(o,sec)phases could nucleate in the lamellar colonies besides theγlamellae precipitated withinα2 ***,at room-temperature(RT),the alloy exhibits(po+α2+γ)triple phase with microstructure ofβo+lamellae+γ,of which the lamellar structure consists ofα2,γandβo,sec *** phase transformation mechanisms in this alloy,involvingβ→α',β→γ,α2→α2/γandα2→βo,sec were discussed.

关键词： Titanium aluminides Quenching Phase transformation Microstructure βphase

high Strain Rate Superplasticity in a Micro-grained Al-Mg-Sc Alloy with Predominant high Angle Grain Boundaries

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Journal of materials Science & Technology 2012年第11期28卷 1025-1030页

作者： F. c. Liu Z.Y. ma F. c. Zhang Shenyang National Laboratory for materials Science Institute of Metal Research Chinese Academy of SciencesShenyang 110016 China State Key Laboratory of Metastable materials Science and Technology Yanshan University Qinhuangdao 066004China

Friction stir processing （FSP） was applied to extruded AI-Mg-Sc alloy to produce fine-grained microstructure with a grain size of 2.2μm. Electron backscatter diffraction （EBSD） result showed that the grain boundary misorientation distribution was very close to a random grain assembly for randomly oriented cubes. Super- plastic investigations in the temperature range of 425-500 ℃ and strain rate range of 1x100^-2-1x10 s^-1 showed that a maximum elongation of 1500% was achieved at 475 ℃ and a high strain rate of 1x100^-2-1x10 s^-1. The FSP AI-Mg-Sc exhibited enhanced superplastic deformation kinetics compared to that predicted by the constitutive relationship for superplasticity in fine-grained aluminum alloys. The origin for enhanced superplas- tic deformation kinetics in the FSP alloy can be attributed to its high fraction of high angle grain boundaries （hAGBs）. The analyses of the superplastic data and scanning electron microscopy （SEM） examinations on the surfaces of deformed specimens indicated that grain boundary sliding is the main superplastic deformation mechanism for the FSP AI-Mg-Sc alloy.

关键词： Superplasticity Friction stir processing Aluminum Microstructure Friction stir welding

DRYING OF GRANULAR maTERIALS IN AGITATED FLUIDIZED BED

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Journal of hydrodynamics 2001年第2期13卷 29-31页

作者： ma, J.h. Liu, h. Feng, D.Z. Dept. of Air-condition Eng. Shandong Inst. of Civil Eng. Jinan 250014 China

An experimental study of the drying characteristics of an agitated fluidized bed dryer is presented and discussed. In the study, the citric acid particles were used as bed material with the diameters ranging from 0.2 mm to 1.3 mm. The variables affecting apparently the drying rate were found to be the mass flow rate, the inlet air temperature, the rotary speed of agitating mechanism and the particles feed rate. comparing with other variables considered, mass flow rate was found to have the least important influence on the drying rate. The agitated fluidized bed dryer is suitable to drying agglomerating or sticky materials.

关键词： Dryers (equipment) Drying Experiments mass transfer

Preserving the literary past, looking to the future: the first hong Kong Literature Database

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Journal of Zhejiang University-Science A(Applied Physics & Engineering) 2005年第11期6卷 1341-1347页

作者： ma Leo F.h. WONG Rita LAU Paul University Library System The Chinese University of Hong Kong Hong Kong ChinaUniversity Library System The Chinese University of Hong Kong Hong Kong ChinaUniversity Library System The Chinese University of Hong Kong Hong Kong China

In the last two decades of the 20th century, there has been an increasing interest in and emphasis on the study of the hong Kong literature in both the academic and general public in hong Kong. Recognizing the emergent need of the resources on hong Kong literature, the University Library System of the chinese University of hong Kong set up the hong Kong Literature Database （the “Database”）, which was the first chinese literature database in the Internet in 2000. The paper will examine how the database is constructed using XML technology andometadata schema, The database also employs Unicode UTF-8 as the internal code. A mapping table for traditional and simplified chinese characters was created based on Unihan and is used behind the scene so that a user can either input traditional or simplified chinese characters and retrieval will give both traditional and simplified chinese characters. currently 65% of journals use OcR technology so that full-text searching is possible. The chinese OcR technology will be examined in greater detail. Special features of the Database such as, page-by-page browse mode, position-highlight for full-page newspaper, linking Table-Of-contents and book jackets from the Library catalogue, etc. are described. The paper will also bring out the problem of massive downloading and compare the state-of-the-art technology and their shortcomings. This paper shows how the hong Kong Literature Database facilitates future collaboration and data exchange by using open standard, shareable structure and the latest technology.

关键词： hong Kong Literature hong Kong Literature Database XML Metadata schema Database structure UnicodeUTF-8 OcR technology

Reversed－Phase　high－Performance　Liquid　　chromatographic　Determination　of　Drugs　of　Abuse

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chinese chemical Letters 1996年第11期7卷 1027-1028页

作者： ma, c Duan, hJ Xu, YQ Zhou, Th chINESE AcAD MED ScI INST MAT MEDBEIJING 100050PEOPLES R CHINA BEIJING UNION MED cOLL BEIJING 100050PEOPLES R CHINA

A high-performance liquid chromatographic method using uv detection for thedetermination of 10 drugs of abuse is described. The method is sample and sensitive. The linear rangesare 20￣100ng/ml with relative standard ... 详细信息

关键词： Determination Drugs Abuse chromatographic