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Soil nutrient stoichiometric ratios and their influencing factors in mountainous areas of the Ili River Valley

Zhongshan Daxue Xuebao/Acta Scientiarum Natralium Universitatis Sunyatseni 2024年第3期63卷 60-70页

作者： Yang H. Sun H. tian Z. liu t. Wu F. Jin X. School of Geography and tourism Xinjiang Normal University Urumqi 830054 China College of Life Science Xinjiang Normal University Urumqi 830054 China

Studying the soil stoichiometric ratios and the influencing factors of different altitude gradients in mountain ecosystems in arid zones is significant in revealing the soil nutrient status and maintaining the sustainable development of mountain ecosystems. In this paper, 13 sample plots were established along the elevation gradient in the mountains of the southern Ili River Valley, and soil in the depth of 0-20 cm was studied to investigate nutrient stoichiometric ratios and their influencing factors. the results showed that: (1) Soil acidity gradually increased with elevation. Organic carbon and total nitrogen contents are significantly higher in the middle and high mountain belts than in the low mountain belts, while total phosphorus and total potassium contents are opposite. (2) Due to altitudinal differences, the carbon-to-nitrogen ratio is significantly higher in the mid-alpine belt than in the low and alpine belts; carbon and phosphorus ratios are significantly higher in the middle and high mountain belts than in the middle and low mountain belts; carbon and potassium ratios are significantly higher in the middle and high mountain belts than in the low mountain belts; nitrogen-phosphorus ratios are higher in the alpine zone, but there is no major difference between the transition zone and the low mountain zone; nitrogen-potassium ratios are much higher in the alpine zone, whereas there is no significant difference between the mid-alpine zone and the transition zone; the differences of phosphorus/potassium ratios between altitudinal gradients are ignorable. (3) the dominant factors affecting the stoichiometric ratios of soil physicochemical indicators are soil organic carbon (62.4%), total phosphorus (15.9%), and total carbon (13.7%); while the major environmental factors are mean annual soil temperature (27.1%), vegetation index (11.2%), elevation (12.3%), and mean annual atmospheric temperature (3.4%). the study showed that the physicochemical indicators have an important influence on the soil stoichiomet

关键词： Ili River valley mountains impact factor soil nutrients stoichiometric ratio

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NICKEL　PHtHALOCYANINE－SURFACtANt　DDAB　FILM　ELECtRODE　FOR　ELECtROCHEMICAL　CAtALYSIS

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Chinese Chemical Letters 1996年第1期7卷 43-46页

作者： Hu, NF liu, t Zeng, YH BEIJING NORMAL UNIV DEPT CHEMBEIJING 100875PEOPLES R CHINA

ＮＩＣＫＥＬＰＨＴＨＡＬＯＣＹＡＮＩＮＥ－ＳＵＲＦＡＣＴＡＮＴＤＤＡＢＦＩＬＭＥＬＥＣＴＲＯＤＥＦＯＲＥＬＥＣＴＲＯＣＨＥＭＩＣＡＬＣＡＴＡＬＹＳＩＳＮａｉＦｅｉＨＵ；．ＴｉｎｑＬＩＵ，ａｎｄＹｏｎｇＨｕａｌＺＥＮＣ... 详细信息

ＮＩＣＫＥＬＰＨＴＨＡＬＯＣＹＡＮＩＮＥ－ＳＵＲＦＡＣＴＡＮＴＤＤＡＢＦＩＬＭＥＬＥＣＴＲＯＤＥＦＯＲＥＬＥＣＴＲＯＣＨＥＭＩＣＡＬＣＡＴＡＬＹＳＩＳＮａｉＦｅｉＨＵ；．ＴｉｎｑＬＩＵ，ａｎｄＹｏｎｇＨｕａｌＺＥＮＣ（ＤｅｐａｒｔｍｅｎｔｏｆＣｈｅｍ...

关键词： DDAB FILM SURFACtANt ELECtRODE ELECtROCHEMICAL CAtALYSIS

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Preparation　of　YSZ　Microporous　Membranes　on　Porous　α-Alumina　with　Metal　chlorides　as　Precursor

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Chemical Research in Chinese Universities 1997年第3期13卷 268-275页

作者： Peng, DK liu, t Yang, PH Xia, CR Meng, GY UNIV SCI & tECHNOL CHINA DEPT MAT SCI & ENGNHEFEI 230026PEOPLES R CHINA

ＰｒｅｐａｒａｔｉｏｎｏｆＹＳＺＭｉｃｒｏｐｏｒｏｕｓＭｅｍｂｒａｎｅｓｏｎＰｏｒｏｕｓα－ＡｌｕｍｉｎａｗｉｔｈＭｅｔａｌｃｈｌｏｒｉｄｅｓａｓＰｒｅｃｕｒｓｏｒＰＥＮＧＤｉｎｇ－ｋｕｎ，ＬＩＵＴａｏ，ＹＡＮＧＰｉ... 详细信息

ＰｒｅｐａｒａｔｉｏｎｏｆＹＳＺＭｉｃｒｏｐｏｒｏｕｓＭｅｍｂｒａｎｅｓｏｎＰｏｒｏｕｓα－ＡｌｕｍｉｎａｗｉｔｈＭｅｔａｌｃｈｌｏｒｉｄｅｓａｓＰｒｅｃｕｒｓｏｒＰＥＮＧＤｉｎｇ－ｋｕｎ，ＬＩＵＴａｏ，ＹＡＮＧＰｉｎｇ－ｈｕａ，ＸＩＡＣｈａｎｇ－ｒ...

关键词： YSZ Preparation Alumina Membranes Metal Microporous Porous Precursor

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StCF conceptual design report (Volume 1): Physics & detector

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Frontiers of physics 2024年第1期19卷 1-154页

作者： M.Achasov X.C.Ai L.P.An R.Aliberti Q.An X.Z.Bai Y.Bai O.Bakina A.Barnyakov V.Blinov V.Bobrovnikov D.Bodrov A.Bogomyagkov A.Bondar I.Boyko Z.H.Bu F.M.Cai H.Cai J.J.Cao Q.H.Cao X.Cao Z.Cao Q.Chang K.t.Chao D.Y.Chen H.Chen H.X.Chen J.F.Chen K.Chen L.L.Chen P.Chen S.L.Chen S.M.Chen S.Chen S.P.Chen W.Chen X.Chen X.F.Chen X.R.Chen Y.Chen Y.Q.Chen H.Y.Cheng J.Cheng S.Cheng t.G.Cheng J.P.Dai L.Y.Dai X.C.Dai D.Dedovich A.Denig I.Denisenko J.M.Dias D.Z.Ding L.Y.Dong W.H.Dong V.Druzhinin D.S.Du Y.J.Du Z.G.Du L.M.Duan D.Epifanov Y.L.Fan S.S.Fang Z.J.Fang G.Fedotovich C.Q.Feng X.Feng Y.t.Feng J.L.Fu J.Gao Y.N.Gao P.S.Ge C.Q.Geng L.S.Geng A.Gilman L.Gong t.Gong B.Gou W.Gradl J.L.Gu A.Guevara L.C.Gui A.Q.Guo F.K.Guo J.C.Guo J.Guo Y.P.Guo Z.H.Guo A.Guskov K.L.Han L.Han M.Han X.Q.Hao J.B.He S.Q.He X.G.He Y.L.He Z.B.He Z.X.Heng B.L.Hou t.J.Hou Y.R.Hou C.Y.Hu H.M.Hu K.Hu R.J.Hu W.H.Hu X.H.Hu Y.C.Hu J.Hua G.S.Huang J.S.Huang M.Huang Q.Y.Huang W.Q.Huang X.t.Huang X.J.Huang Y.B.Huang Y.S.Huang N.Hüsken V.Ivanov Q.P.Ji J.J.Jia S.Jia Z.K.Jia H.B.Jiang J.Jiang S.Z.Jiang J.B.Jiao Z.Jiao H.J.Jing X.L.Kang X.S.Kang B.C.Ke M.Kenzie A.Khoukaz I.Koop E.Kravchenko A.Kuzmin Y.Lei E.Levichev C.H.Li C.Li D.Y.Li F.Li G.Li G.Li H.B.Li H.Li H.N.Li H.J.Li H.L.Li J.M.Li J.Li L.Li L.Li L.Y.Li N.Li P.R.Li R.H.Li S.Li t.Li W.J.Li X.Li X.H.Li X.Q.Li X.H.Li Y.Li Y.Y.Li Z.J.Li H.Liang J.H.Liang Y.t.Liang G.R.Liao L.Z.Liao Y.Liao C.X.Lin D.X.Lin X.S.Lin B.J.liu C.W.liu D.liu F.liu G.M.liu H.B.liu J.liu J.J.liu J.B.liu K.liu K.Y.liu K.liu L.liu Q.liu S.B.liu t.liu X.liu Y.W.liu Y.liu Y.L.liu Z.Q.liu Z.Y.liu Z.W.liu I.Logashenko Y.Long C.G.Lu J.X.Lu N.Lu Q.F.Lü Y.Lu Y.Lu Z.Lu P.Lukin F.J.Luo t.Luo X.F.Luo Y.H.Luo H.J.Lyu X.R.Lyu J.P.Ma P.Ma Y.Ma Y.M.Ma F.Maas S.Malde D.Matvienko Z.X.Meng R.Mitchell A.Nefediev Y.Nefedov S.L.Olsen Q.Ouyang P.Pakhlov G.Pakhlova X.Pan Y.Pan E.Passemar Y.P.Pei H.P.Peng L.Peng X.Y.Peng X.J.Peng K.Peters S.Pivovarov E.Pyata B.B.Qi Y.Q.Qi W.B.Qian Y.Qian C.F.Qiao J.J.Qin J.J.Qin L.Q.Qin X.S.Qin t.L.Qiu J.Rademacker C.F.Redmer H.Y.Sang Anhui University Hefei 230039China Beihang University Beijing 100191China Budker Institute of Nuclear Physics Novosibirsk 630090Russia CAS Key Laboratory of theoretical Physics Institute of Theoretical PhysicsChinese Academy of SciencesBeijing 100190China Cavendish Laboratory University of CambridgeJJ Thomson AveCambridge CB30HEUnited Kingdom Central China Normal University Wuhan 430079China Central South University Changsha 410083China China University of Geosciences Wuhan 430074China China University of Mining and technology Xuzhou 221116China École Polytechnique Fédérale de Lausanne(EPFL) LausanneSwitzerland Fudan University Shanghai 200433China Goethe University Frankfurt D-60325 Frankfurt am MainGermany Guangxi Normal University Guilin 541004China Guangxi Uninversity Nanning 530004China Hangzhou Institute for Advanced Study UCASHangzhou 310024China Hebei Normal University Shijiazhuang 050024China Hebei University Baoding 071002China Hefei University of technology Hefei 230601China Helmholtz Institute Mainz Staudinger Weg 18D-55099 MainzGermany Henan Normal University Xinxiang 453007China Henan University Kaifeng 475004China High Energy Physics Center Chung-Ang UniversitySeoul 06974Korea Higher School of Economy 11 Pokrovsky Bulvar Moscow 109028Russia Huangshan University Huangshan 245000China Hubei University of Automotive technology Shiyan 442002China Hunan Normal University Changsha 410081China Hunan University of Science and technology Xiangtan 411201China Hunan University Changsha 410082China Indiana University BloomingtonIndiana 47405USA Inner Mongolia University Hohhot 010021China Institute of Advanced Science Facilities Shenzhen 518107China Institute of High Energy Physics Chinese Academy of SciencesBeijing 100049China Institute of Modern Physics Chinese Academy of SciencesLanzhou 730000China Institute of Physics Academia SinicaTaipeiTaiwan 11529China Institute of theoretical Physics Chinese Academy of SciencesBeijing 100190China Jilin University Changch

the superτ-charm facility(StCF)is an electron–positron collider proposed by the Chinese particle physics community.It is designed to operate in a center-of-mass energy range from 2 to 7 GeV with a peak luminosity of 0.5×10^(35) cm^(–2)·s^(–1) or higher.the StCF will produce a data sample about a factor of 100 larger than that of the presentτ-charm factory—the BEPCII,providing a unique platform for exploring the asymmetry of matter-antimatter(charge-parity violation),in-depth studies of the internal structure of hadrons and the nature of non-perturbative strong interactions,as well as searching for exotic hadrons and physics beyond the Standard Model.the StCF project in China is under development with an extensive R&D program.this document presents the physics opportunities at the StCF,describes conceptual designs of the StCF detector system,and discusses future plans for detector R&D and physics case studies.

关键词： electron–positron collider tau-charm region high luminosity StCF detector conceptual design

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未固结流砂地层采油过程中出砂情况模拟实验

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石油勘探与开发 2017年第5期44卷 811-816页

作者： PERERA M S A RANJItH P G RAtHNAWEERA t D DE SILVA G P D liu t Department of Civil Engineering Monash University Department of Infrastructure Engineering The University of Melbourne

为了研究未固结流砂储集层在采油过程中的出砂情况和影响出砂的主要因素,进行了不同条件下的出砂过程模拟实验。使用水洗白砂、黏土(高岭土)和蒸馏水制成未固结流砂地层模型,利用新开发的出砂模拟装置进行了模拟实验,并分析了作用于地... 详细信息

为了研究未固结流砂储集层在采油过程中的出砂情况和影响出砂的主要因素,进行了不同条件下的出砂过程模拟实验。使用水洗白砂、黏土(高岭土)和蒸馏水制成未固结流砂地层模型,利用新开发的出砂模拟装置进行了模拟实验,并分析了作用于地层的拖曳力和地层胶结特征对出砂的影响。研究表明,随着拖曳力的增加,出砂速度和产油速度都加快;随着胶结物含量的增加,出砂量和产油量明显降低,甚至在胶结物含量较高的情况下出砂量几乎为零。地层压力大的油藏在开采期间由于产生了较大的拖曳力更可能出砂,而拖曳力和有效地层应力共同影响油藏的总体产油量。可以根据地层黏土含量估计出砂情况,从而通过采取适当的防砂措施尽可能减少出砂量。某些情况下油藏比气藏更容易出砂。

关键词：流砂地层出砂采油工艺黏土含量胶结程度拖曳力

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Segregation enabled outstanding combination of mechanical and corrosion properties in a FeCrNi medium entropy alloy manufactured by selective laser melting

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Journal of Materials Science & technology 2022年第4期99卷 207-214页

作者： Heng Duan Bin liu Ao Fu Junyang He tao Yang C.t.liu Yong liu State Key Lab of Powder Metallurgy Central South UniversityChangsha 410083China Max-Planck-Institut für Eisenforschung Max-Planck-βe 1Düsseldorf 40237Germany Department of Materials Science and Engineering City University of Hong KongHong KongChina Department of Mechanical Engineering City University of Hong KongHong KongChina

Selective laser melting(SLM)has the advantage in preparing supersaturated solid solutions due to its unique thermal field and high solidification rate.In this study,a face-centered cubic single-phase FeCrNi medium entropy alloy(MEA)with an ultrahigh Cr content(~35 at.%)was additively manufactured by SLM.the as-built MEA shows a hierarchical microstructure of coarse columnar grains and submicron dislocation cell structures,where the cell boundaries are probed segregated with Cr and C and decorated with nano carbides.the appearance of these dislocation barriers results in an excellent combination of strength(σ_(0.2)=745 MPa,σ_(UtS)=1007 MPa)and ductility(ε_(f)=31%).the current MEA also shows a superb corrosion resistance with a corrosion current density of 0.06μA cm^(−2) in 3.5 wt.%NaCl solution,which is far lower than that of 316 L.the high content of solutioned Cr in the MEA ensures sufficient Cr supply to form an integrated Cr_(2)O_(3) passive film,and the large number of cell boundaries acting as the diffusion channels lead to the fast formation of a stable passive film over the alloy surface.

关键词： Selective laser melting Microsegregation Strength Ductility Corrosion resistance

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Enhanced helium ion irradiation tolerance in a Fe-Co-Ni-Cr-Al-ti high-entropy alloy with L12 nanoparticles

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Journal of Materials Science & technology 2023年第12期143卷 169-177页

作者： Y.L.Zhao F.L.Meng t.Yang J.H.Luan S.F.liu G.M.Yeli W.t.Lin W.H.liu X.J.liu C.t.liu J.J.Kai School of Materials Science and Engineering Harbin Institute of Technology(Shenzhen)Shenzhen 518055China School of Materials Science and Engineering Southern University of Science and TechnologyShenzhen 518055China Department of Materials Science and Engineering Mechanical Behavior Division of Shenyang National Laboratory for Materials ScienceCity University of Hong KongHong KongChina Department of Mechanical Engineering City University of Hong KongHong KongChina Institute of Nuclear&New Energy technology Tsinghua UniversityBeijing 100084China

L12-strengthened high entropy alloys(HEAs)with excellent room and high-temperature mechanical prop-erties have been proposed as promising candidates as structural materials for advanced nuclear systems.However,knowledge about their radiation response is fairly limited.In the present work,a novel HEA with a high density of L12 nanoparticles was irradiated with He ion at 500°C.transmission electron microscope(tEM)and atom probe tomography(APt)were employed to study the evolution of mi-crostructural stability and radiation-induced segregation.Similar to the single-phase FeCoNiCr HEA,the main microstructural features were numerous large faulted dislocation loops and helium bubbles.While the irradiation resistance of the present L12-strengthened HEA is much improved in terms of reduced bubble size,which could be attributed to the considerable He trapping efficiency of the coherent pre-cipitate/matrix interface and the enhanced capability of the interface for damage elimination when the matrix channel width is narrow.APt analysis revealed that an inverse-Kirkendall-mechanism-dominated radiation-induced segregation(RIS)occurs around bubbles,where a significant Co enrichment and Ni de-pletion can be clearly observed.In addition,the competing dynamics of ballistic mixing and elemental clustering that raised from the irradiation-enhanced diffusion in a highly supersaturated matrix,along with the low precipitation nucleation barrier due to the small lattice misfit,lead to a dynamical pre-cipitation dissolution and re-precipitation appears under irradiation.Such a promising phenomenon is expected to promote a potential self-healing effect and could in turn provide a sustainable irradiation tolerance over the operational lifetime of a reactor.

关键词： L12 nanoparticles High-entropy alloy Helium bubble Phase stability Radiation-induced segregation

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Frequency Veering of Rotating Metal Porous twisted Plate with Cantilever Boundary Using Shell theory

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Acta Mechanica Solida Sinica 2022年第2期35卷 282-302页

作者： Y.Y.liu Y.X.Hao W.Zhang L.t.liu S.W.Yang Y.t.Cao College of Mechanical Engineering Beijing Information Science and Technology UniversityBeijing 100192China College of Mechanical Engineering Beijing University of TechnologyBeijing 100124China

the frequency veering of a metal porous rotating cantilever twisted plate with twist angle and stagger angle is investigated.Metal porous materials may have the characteristics of gradient or uniform distribution along the thickness direction.Based on the classical shell theory,considering the influence of centrifugal force produced by high-speed rotation,the free vibration equations of a rotating cantilever twisted plate are derived.through the polynomial function and Rayleigh-Ritz method,the natural frequencies and mode shapes of the metal porous cantilever twisted plate in both static and rotating states are derived.the accuracy of the present theory and calculation results is confirmed by a comparison between them and the results available from the literature and those obtained from Abaqus.the influences of the thickness ratio,porosity,twist angle,stagger angle and rotational velocity on the frequency veering and mode shape shift of the rotating cantilever twisted plate with porous material under three different distributions are analyzed.It should be mentioned that the frequency veering accompanied by mode shape shift occurs in both static and dynamic states.

关键词： Frequency veering Rotating twisted plate Cantilever boundary Metal porous

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Off-stoichiometry-guided design of high-strength chemically complex intermetallic-based alloys with outstanding ductility

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Journal of Materials Science & technology 2023年第29期160卷 28-33页

作者： Bo Xiao Jixun Zhang Shaofei liu Yilu Zhao Lianyong Xu C.t.liu tao Yang Department of Materials Science and Engineering Mechanical Behavior Division of Shenyang National Laboratory for Materials ScienceCity University of Hong KongHong KongChina Center for Advanced Nuclear Safety and Sustainable Development City University of Hong KongHong KongChina Hong Kong Institute for Advanced Study City University of Hong KongHong KongChina School of Materials Science and Engineering Harbin Institute of Technology(Shenzhen)Shenzhen 518055China School of Materials Science and Engineering Tianjin UniversityTianjin 300350China

1.Introduction the lasting drive for improved energy efficiency in power gen-eration encourages the innovative design of advanced structural materials with superb mechanical properties[1-6].Among these materials,ordered intermetallic alloys[7-9],as a unique class of metallic materials,have drawn increasing concern from both the scientific and industrial communities due to their intriguing high-temperature properties,strong chemical binding,and low atomic mobility[10,11].However,in light of the insufficient number of slip systems and/or intrinsically weak grain boundary(GB),they are usually brittle at ambient temperature,severely hindering their practical use in engineering systems[12].Previous studies reported that the change in alloy stoichiometry has a significant beneficial effect on the ductility of intermetallic alloys.For instance,liu et al.

关键词： intermetallic ductility alloys

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Natural vibration of cantilever porous twisted plate with variable thickness in different directions

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Defence technology(防务技术) 2023年第9期27卷 200-216页

作者： Y.X.Hao Y.Y.liu W.Zhang L.t.liu K.C.Sun S.W.Yang College of Mechanical Engineering Beijing Information Science and Technology UniversityBeijing100192PR China College of Mechanical Engineering Beijing University of TechnologyBeijing100124PR China

In this paper,the blade is assumed to be a rotating variable thickness cantilever twisted plate structure,and the natural vibrations of variable thickness cantilever twisted plate made of metal porous material are studied.It is assumed that the thickness of the plate changes along spanwise direction and chordwise direction,respectively,and it changes in both directions.the classical thin shell theory,the first and second fundamental forms of surface and von Karman geometric relationship are employed to derive the total potential energy and kinetic energy of the cantilever twisted plate,in which the centrifugal force potential due to high rotational speed is included.then,according to the Rayleigh-Ritz procedure and applying the polynomial functions which satisfy the cantilever boundary conditions,the dynamic system expressed by equations of motion is reduced to an eigenvalue problem.By numerical simulation,the frequency curves and the mode shapes of the twisted plate can be obtained to reveal the internal connection between natural vibration and the parameters.A series of comparison studies are performed to verify the accuracy of the present formulation and calculations,in which compared data come from experimental,finite element method and theoretical calculation,respectively.the influence of pre-twist angle,three different forms of thickness taper ratio and rotational speed on natural vibration,mode exchange and frequency veering phenomenon of the system is discussed in detail.In addition,the approach proposed here can efficiently extract analytical expressions of mode functions for rotating variable thickness cantilever twisted plate structures.

关键词： Porous cantilever twisted plate Variable thickness Natural vibration Frequency veering Mode exchange

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