检索结果-南通市图书馆

Science China chemistry 2006年第6期49卷 492-498页

作者： qi yuanhua1,{1.,{2., jinan 2.0100, China 2. School of Physics and Microelectronics,{2., jinan 2.0061. China institute of {1.{2. Shandong University Jinan China School of Physics and Microelectronics Shandong University Jinan China

The density functional theory (DFT) combining with the non-equilibrium Green functions (NEGF) method is applied to the study of the electronic transport properties for a Di-thiol-benzene (DTB) molecule coupled to two Au(1.1. surfaces. The dependence of the transport properties on the bias, the coupling geometry of the molecule-electrode interface, and the intermolecular interaction are examined in detail. The results show that the existence of the hydrogen atom at the end of the DTB molecule would significantly decrease the transmission coefficients, and then the differential conductance (dI/dV). By changing the position of the DTB molecule located between two electrodes a maximum value of calculated current is observed. It is also found that the intermolecular interaction will strongly influence the transport properties of the system studied.

关键词： non-equilibrium Green functions method, transmission spectrum, the molecular projected selfconsistent Hamiltonian, projected density of state.

Surface reconstruction and structural transformation of twodimensional Ni-Fe MOFs for oxygen evolution in seawater media

在线全文

学校读者我要写书评

暂无评论

Nano Research 2024年第4期17卷 2429-2437页

作者： Liyuan Xiao Xue Bai Jingyi Han Tianmi Tang Siyu Chen Hui qi Changmin Hou Fuquan Bai Zhenlu Wang Jingqi {2. institute of Physical {1. College of ChemistryJilin UniversityChangchun 130021China The Second Hospital of Jilin university Changchun 130021China State Key Laboratory of Inorganic Synthesis and Preparative chemistry College of ChemistryJilin UniversityChangchun 130012China Laboratory of theoretical and Computational {1. Institute of Theoretical ChemistryCollege of ChemistryChangchun 130023China

As a four-electron transfer reaction,oxygen evolution reaction(OER)is limited by large overpotential and slow ***,we in-situ synthesized two-dimensional(2.)Ni-Fe metal-organic framework nanosheets on nickel foam(NixFe-TPA/NF,TPA=terephthalic acid)for oxygen evolution in alkaline and alkaline seawater *** 1.M KOH,Ni3Fe-TPA/NF shows a low overpotential(η1.)of 1.9 mV at 1. mA·cm^(-2. and an ultra-low overpotential of only 2.0 mV at 500 mA·cm^(-2..In alkaline seawater,Ni3Fe-TPA/NF still provides impressive OER performance,with anη1. of 2.5 ***-situ Raman characterization results show that the phase transition occurs during the OER,and Ni3FeOOH with more oxygen vacancies is in-situ formed,reducing the OER energy *** functional theory(DFT)reveals that the synergy between Ni and Fe reduces the energy barrier and accelerates the rate-determining *** addition,the ultra-thin 2. sheet structure and the close combination of Ni3FeOOH and highly conductive NF support ensure the high catalytic OER ***,the surface reconstruction and structural modification strategy can be used to design and prepare high-performance OER electrocatalysts for energy-related applications.

关键词： density functional theory(DFT)calculation Ni3FeOOH oxygen evolution reaction seawater electrolysis surface reconstruction

在线全文

维普期刊数据库

学校读者我要写书评

暂无评论

锂离子精密光谱与核结构信息

物理学报 2024年第20期73卷 83-99页

作者：管桦戚晓秋陈邵龙史庭云高克林中国科学院精密测量科学与技术创新研究院武汉430071 浙江理工大学物理系杭州310018 武汉量子技术研究院武汉430206

锂离子精密光谱为束缚态量子电动力学的验证以及原子核结构的研究提供了独特的平台.本文综述了实验和理论联合研究团队近年来对^(6,7)Li^(+)离子^(3)S_(1.和^(3)P_(J)态超精细劈裂的高精度理论计算与实验测量的研究成果.在理论方面,理... 详细信息

锂离子精密光谱为束缚态量子电动力学的验证以及原子核结构的研究提供了独特的平台.本文综述了实验和理论联合研究团队近年来对^(6,7)Li^(+)离子^(3)S_(1.和^(3)P_(J)态超精细劈裂的高精度理论计算与实验测量的研究成果.在理论方面,理论团队采用束缚态量子电动力学方法对^(3)S_(1.和^(3)P_(J)态的超精细劈裂进行了计算,精确至mα^(6)阶.在实验方面,实验团队分别通过饱和荧光光谱法和光学Ramsey方法对^(7)Li^(+)和^(6)Li^(+)离子的超精细劈裂进行了高精度测量,并由此提取了^(6,7)Li核的Zemach半径.结果显示,^(6)Li的Zemach半径与核模型计算值存在显著差异,揭示了^(6)Li核的奇异特性.这不仅为原子核结构的探索提供了重要信息,也将进一步推动少电子原子和分子的精密光谱研究.

关键词：精密光谱量子电动力学 Zemach 半径

维普期刊数据库博看期刊

HeICl络合物的振动预离解:含时黄金规则波包研究

在线全文

学校读者我要写书评

暂无评论

原子与分子物理学报 1999年第1期16卷 6-10页

作者：赵显程秀凤关大任山东师范大学物理系山东大学理论化学研究所

用含时黄金规则波包法计算了ＨｅＩＣｌｖａｎｄｅｒＷａａｌｓ络合物分子的振动预离解寿命和离解碎片ＩＣｌ的终转动态分布。并与实验和其他理论计算结果做了比较。波包计算所用的总传播时间（不超过１ｐｓ，远小于离解寿命）实际上是... 详细信息

用含时黄金规则波包法计算了ＨｅＩＣｌｖａｎｄｅｒＷａａｌｓ络合物分子的振动预离解寿命和离解碎片ＩＣｌ的终转动态分布。并与实验和其他理论计算结果做了比较。波包计算所用的总传播时间（不超过１ｐｓ，远小于离解寿命）实际上是解离碎片在振动退激发绝热势能面上的滞留时间。终态相互作用对终转动态分布起着决定性作用。并预言了ＨｅＩＣｌ终转动态分布对振动态的依赖。

关键词：含时黄金规则波包振动预离解 HeICl 络合物

以掺氢天然气为燃料直接内重整固体氧化物电池堆的稳定性

在线全文

学校读者我要写书评

暂无评论

电化学（中英文） 2024年第1期30卷 46-54页

作者：汤亚飞武安祺韩贝贝刘华包善军林王林陈铭官万兵 Subhash C.Singhal 中国科学院宁波材料技术与工程研究所浙江宁波315201 浙江启明电力集团有限公司浙江舟山316099 浙江大学舟山海洋研究中心浙江舟山316021 丹麦技术大学能源转换与储存系川麦哥本哈根

本文研究了掺氢天然气直接内重整平管型固体氧化物电池短堆的长期稳定性和衰减机理。通过约3000小时的实测实验,结果显示,电堆的总体衰减率为2.3%·kh^(-1.,电堆中三个金属连接板的面积比电阻分别增加了0.2.6Ω·cm^(2.、0.2.4Ω·cm^(2...

本文研究了掺氢天然气直接内重整平管型固体氧化物电池短堆的长期稳定性和衰减机理。通过约3000小时的实测实验,结果显示,电堆的总体衰减率为2.3%·kh^(-1.,电堆中三个金属连接板的面积比电阻分别增加了0.2.6Ω·cm^(2.、0.2.4Ω·cm^(2.和0.2.9Ω·cm^(2.,但电堆中两个电池的电压反而分别增加了3.38 m V·kh^(-1.和3.78 m V·kh^(-1.。电堆衰减主要由金属连接件表层氧化及其与阴极集流层材料反应生成Sr CrO_(4)物质,两者共同作用增大了电池与金属连接体间的界面电阻所致。结果表明,以掺氢天然气为燃料直接内重整平管型固体氧化物燃料电池电堆具有良好的稳定性。本文工作为掺氢天然气在固体氧化物燃料电池堆中的直接内重整应用提供了理论参考与实验依据。

关键词：掺氢天然气内重整稳定性固体氧化物电堆

The abundance of massive compact galaxies at 1.0

在线全文

维普期刊数据库

学校读者我要写书评

暂无评论

Research in Astronomy and Astrophysics 2019年第10期19卷 109-120页

作者： Shi-Ying Lu Yi-Zhou Gu guan-Wen Fang {1.-Rong Yuan Department of Physics and institute of {1. Physics Nanjing Normal University Nanjing 210023 China institute for Astronomy and History of Science and Technology Dali UniversityDali 671003 China

Based on a large sample of massive(M* 1.1. M⊙) compact galaxies at 1.0 < z < 3.0 in five 3 D-HST/CANDELS fields, we quantify the fractional abundance and comoving number density of massive compact galaxies as a funct... 详细信息

Based on a large sample of massive(M* 1.1. M⊙) compact galaxies at 1.0 2.and a plateau at 1.2. For massive cSFGs, a plateau in the number density at 2.2.to 1. The evolutionary trends of the cQG and cSFG abundances support the scenario that the cSFGs at z≥ 2.may have been rapidly quenched into quiescent phase via violent dissipational processes, such as major merger and disk instabilities. The rarity of the cSFGs at lower redshifts(z 1. can be interpreted by the decrease of gas reservoirs in dark matter halos and the consequent low efficiency of gas-rich dissipation.

关键词： galaxies high-redshift-galaxies massive-compact-galaxies evolution-galaxies

Amplitude analysis of the decays D^(0)→π^(+)π^(−)π^(+)π^(−)and D^(0)→π^(+)π^(−)π^(0)π^(0)

在线全文

学校读者我要写书评

暂无评论

Chinese Physics C 2024年第8期48卷 6-33页

作者： M.Ablikim M.N.Achasov P.Adlarson O.Afedulidis X.C.Ai R.Aliberti A.Amoroso Q.An Y.Bai O.Bakina I.Balossino Y.Ban H.-R.Bao V.Batozskaya K.Begzsuren N.Berger M.Berlowski M.Bertani D.Bettoni F.Bianchi E.Bianco A.Bortone I.Boyko R.A.Briere A.Brueggemann H.Cai X.Cai A.Calcaterra G.F.Cao N.Cao S.A.Cetin J.F.Chang W.L.Chang G.R.Che G.Chelkov C.Chen C.H.Chen Chao Chen G.Chen H.S.Chen M.L.Chen S.J.Chen S.L.Chen S.M.Chen T.Chen X.R.Chen X.T.Chen Y.B.Chen Y.Q.Chen Z.J.Chen Z.Y.Chen S.K.Choi X.Chu G.Cibinetto F.Cossio J.J.Cui H.L.Dai J.P.Dai A.Dbeyssi R.E.de Boer D.Dedovich C.Q.Deng Z.Y.Deng A.Denig I.Denysenko M.Destefanis F.De Mori B.Fang S.S.Fang W.X.Fang Y.Fang Y.Q.Fang R.Farinelli L.Fava F.Feldbauer G.Felici C.Q.Feng J.H.Feng Y.T.Feng K.Fischer M.Fritsch C.D.Fu J.L.Fu Y.W.Fu H.Gao Y.N.Gao Yang Gao S.Garbolino I.Garzia P.T.Ge Z.W.Ge C.Geng E.M.Gersabeck B.Ding X.X.Ding Y.Ding Y.Ding J.Dong L.Y.Dong M.Y.Dong X.Dong M.C.Du S.X.Du Z.H.Duan P.Egorov Y.H.Fan J.Fang JA.Gilman K.Goetzen L.Gong W.X.Gong W.Gradl S.Gramigna M.Greco M.H.Gu Y.T.Gu C.Y.guan Z.L.guan A.Q.Guo L.B.Guo M.J.Guo R.P.Guo Y.P.Guo A.Guskov J.Gutierrez K.L.Han T.T.Han X.Q.Hao F.A.Harris K.K.He K.L.He F.H.Heinsius C.H.Heinz Y.K.Heng C.Herold T.Holtmann P.C.Hong G.Y.Hou X.T.Hou Y.R.Hou Z.L.Hou B.Y.Hu H.M.Hu J.F.Hu T.Hu Y.Hu G.S.Huang K.X.Huang L.Q.Huang X.T.Huang Y.P.Huang T.Hussain F.H\"olzken N.H\"usken N.in der Wiesche M.Irshad J.Jackson S.Janchiv J.H.Jeong Q.Ji Q.P.Ji W.Ji X.B.Ji X.L.Ji Y.Y.Ji X.Q.Jia Z.K.Jia D.Jiang H.B.Jiang P.C.Jiang S.S.Jiang T.J.Jiang X.S.Jiang Y.Jiang J.B.Jiao J.K.Jiao Z.Jiao S.Jin Y.Jin M.Q.Jing X.M.Jing T.Johansson S.Kabana N.Kalantar-Nayestanaki X.L.Kang X.S.Kang M.Kavatsyuk B.C.Ke V.Khachatryan A.Khoukaz R.Kiuchi O.B.Kolcu B.Kopf M.Kuessner X.Kui A.Kupsc W.K\"uhn J.J.Lane P.Larin L.Lavezzi T.T.Lei Z.H.Lei H.Leithoff M.Lellmann T.Lenz C.Li C.Li C.H.Li Cheng Li D.M.Li F.Li G.Li H.Li H.B.Li H.J.Li H.N.Li Hui Li J.R.Li J.S.Li K.Li L.J.Li L.K.Li Lei Li M.H.Li P.R.Li Q.M.Li Q.X.Li R.Li S.X.Li T.Li W.D.Li W.G.Li X.Li X.H.Li X.L.Li X.Y.Li Y institute of High Energy Physics Chinese Academy of SciencesBeijing 100049China Beihang university Beijing 100191China Bochum Ruhr-university D-44780 BochumGermany Budker institute of Nuclear Physics SB RAS(BINP) Novosibirsk 630090Russia Carnegie Mellon university PittsburghPennsylvania 15213USA Central China Normal university Wuhan 430079China Central South university Changsha 410083China China Center of Advanced Science and Technology Beijing 100190China China university of Geosciences Wuhan 430074China Chung-Ang university Seoul06974Republic of Korea COMSATS university Islamabad Lahore CampusDefence RoadOff Raiwind Road54000 LahorePakistan Fudan university Shanghai 200433China GSI Helmholtzcentre for Heavy Ion Research GmbH D-64291 DarmstadtGermany guangxi Normal {1. Guilin 541004China guangxi {1. Nanning 530004China Hangzhou Normal university Hangzhou 310036China Hebei university Baoding 071002China Helmholtz institute Mainz Staudinger Weg 18D-55099 MainzGermany Henan Normal university Xinxiang 453007China Henan university Kaifeng 475004China Henan university of Science and Technology Luoyang 471003China Henan university of Technology Zhengzhou 450001China Huangshan College Huangshan 245000China Hunan Normal university Changsha 410081China Hunan university Changsha 410082China Indian institute of Technology Madras Chennai 600036India Indiana university BloomingtonIndiana 47405USA INFN Laboratori Nazionali di Frascati INFN Laboratori Nazionali di FrascatiI-00044FrascatiItaly INFN Laboratori Nazionali di Frascati INFN Sezione di PerugiaI-06100PerugiaItaly INFN Laboratori Nazionali di Frascati University of PerugiaI-06100PerugiaItaly INFN Sezione di Ferrara INFN Sezione di FerraraI-44122FerraraItaly INFN Sezione di Ferrara University of FerraraI-44122FerraraItaly Inner Mongolia university Hohhot 010021China institute of Modern Physics Lanzhou 730000China institute of Physics and Technology Peace Avenue 54BUlaanbaatar 13330Mongolia Instituto de A

Using e^(+)e^(−)annihilation data corresponding to an integrated luminosity of 2.93 fb^(−1.taken at the center-of-mass energy√s=3.773 GeV with the BESIII detector,a joint amplitude analysis is performed on the decays D^(0)→π^(+)π^(−)π^(+)π^(−)and D^(0)→π^(+)π^(−)π^(0)π^(0)(non-η).The fit fractions of individual components are obtained,and large interferences among the dominant components of the decays D^(0)→a_(1.(1.0}0)π,D^(0)→π(1.00)π,D^(0)→ρ(770)ρ(770),and D^(0)→2.ππ)_(S)are observed in both *** the obtained amplitude model,the CP-even fractions of D^(0)→π^(+)π^(−)π^(+)π^(−)and D^(0)→π^(+)π^(−)π^(0)π^(0)(non-η)are determined to be(75.2.1.1.(stat).±1.5_(syst.))%and(68.9±1.5_(stat).±2.4_(syst.))%,*** branching fractions of D^(0)→π^(+)π^(−)π^(+)π^(−)and D^(0)→π^(+)π^(−)π^(0)π^(0)(non-η)are measured to be(0.688±0.01._(stat.)±0.01._(syst.))%and(0.951.0.02._(stat.)±0.02._(syst.))%,*** amplitude analysis provides an important model for the binning strategy in measuring the strong phase parameters of D^(0)→4πwhen used to determine the CKM angleγ(ϕ_(3))via the B^(−)→DK^(−)decay.

关键词： BESIII D^(0)meson decays amplitude analysis CP-even fraction

Au/g-C;N;heterostructure sensitized by black phosphorus for full solar spectrum waste-to-hydrogen conversion

在线全文

维普期刊数据库

学校读者我要写书评

暂无评论

Science China Materials 2022年第4期65卷 974-984页

作者： Lijing Wang Yafang qi Hui Li Renquan {1. Fuli Zhang qingfeng Zhou Dandan Wu Zhao Zhao Gang Zhou Zaicheng Sun Henan Engineering Center of New Energy Battery Materials Henan D&A Engineering Center of Advanced Battery MaterialsCollege of Chemistry and Chemical EngineeringInstitute of Architectural EngineeringShangqiu Normal UniversityShangqiu476000China Faculty of Physics Faculty of ChemistryNortheast Normal UniversityChangchun130024China Center of excellence for environmental safety and biological effects Beijing Key Lab for Green Catalysis and SeparationDepartment of Chemistry and Chemical EngineeringCollege of Environmental and Energy EngineeringBeijing University of TechnologyBeijing100124China Key Laboratory of Integrated Regulation and Resource Development on Shallow Lake of Ministry of Education College of EnvironmentHohai UniversityNanjing210098China

Photocatalytic water splitting with simultaneous degradation of organic pollutants is an effective strategy to alleviate the increasingly serious energy and environmental ***,the photocatalytic activity is restricted by the high charge recombination rate and limited sunlight ***,black phosphorus(BP)with a broad sunlight response range was utilized as a photosensitizer to enhance the photocatalytic performance of the Au/carbon nitride(CN)*** as-prepared BP/Au/CN exhibited a significantly enhanced H_(2. generation rate of 1.00.8µmol h^(−1. g^(−1. under UV-vis light irradiation,which is almost 70 times higher than that of bare CN and BP/CN and 2.folds higher than that of the Au/CN ***,the optimal BP/Au/CN sample presented a waste-to-hydrogen production rate of 1.5.8µmol h^(−1. g^(−1. with the degradation of bisphenol A,verifying the synergistic effect of the ternary *** photocatalytic mechanism was systematically studied by the combination of experiments and theoretical *** improved photocatalytic performance was derived from the overall sunlight absorption ability of BP,effective electron transfer media and plasmonic character of Au nanoparticles,as well as the matched work function and strong interaction of the three components.A unidirectional electron transfer from BP to Au and then to CN was established,which effectively improved the charge transfer capability,resulting from the appropriate Ohmic contact of Au and BP and the Schottky barrier constructed in Au/CN hybrid.

关键词： Au/carbon nitride black phosphorus photocatalysis H_(2.production waste treatment

Determination of the number ofψ(3686)events taken at BESⅢ

在线全文

学校读者我要写书评

暂无评论

Chinese Physics C 2024年第9期48卷 8-20页

作者： M.Ablikim M.N.Achasov P.Adlarson O.Afedulidis X.C.Ai R.Aliberti A.Amoroso Q.An Y.Bai O.Bakina I.Balossino Y.Ban H.-R.Bao V.Batozskaya K.Begzsuren N.Berger M.Berlowski M.Bertani D.Bettoni F.Bianchi E.Bianco A.Bortone I.Boyko R.A.Briere A.Brueggemann H.Cai X.Cai A.Calcaterra G.F.Cao N.Cao S.A.Cetin J.F.Chang G.R.Che G.Chelkov C.Chen C.H.Chen Chao Chen G.Chen H.S.Chen H.Y.Chen M.L.Chen S.J.Chen S.L.Chen S.M.Chen T.Chen X.R.Chen X.T.Chen Y.B.Chen Y.Q.Chen Z.J.Chen Z.Y.Chen S.K.Choi G.Cibinetto F.Cossio J.J.Cui H.L.Dai J.P.Dai A.Dbeyssi R.E.de Boer D.Dedovich C.Q.Deng Z.Y.Deng A.Denig I.Denysenko M.Destefanis F.De Mori B.Ding X.X.Ding Y.Ding Y.Ding J.Dong L.Y.Dong M.Y.Dong X.Dong M.C.Du S.X.Du Y.Y.Duan Z.H.Duan P.Egorov Y.H.Fan J.Fang J.Fang S.S.Fang W.X.Fang Y.Fang Y.Q.Fang R.Farinelli L.Fava F.Feldbauer G.Felici C.Q.Feng J.H.Feng Y.T.Feng M.Fritsch C.D.Fu J.L.Fu Y.W.Fu H.Gao X.B.Gao Y.N.Gao Yang Gao S.Garbolino I.Garzia L.Ge P.T.Ge Z.W.Ge C.Geng E.M.Gersabeck A.Gilman K.Goetzen L.Gong W.X.Gong W.Gradl S.Gramigna M.Greco M.H.Gu Y.T.Gu C.Y.guan Z.L.guan A.Q.Guo L.B.Guo M.J.Guo R.P.Guo Y.P.Guo A.Guskov J.Gutierrez K.L.Han T.T.Han F.Hanisch X.Q.Hao F.A.Harris K.K.He K.L.He F.H.Heinsius C.H.Heinz Y.K.Heng C.Herold T.Holtmann P.C.Hong G.Y.Hou X.T.Hou Y.R.Hou Z.L.Hou B.Y.Hu H.M.Hu J.F.Hu S.L.Hu T.Hu Y.Hu G.S.Huang K.X.Huang L.Q.Huang X.T.Huang Y.P.Huang T.Hussain F.Hölzken N.Hüsken N.in der Wiesche J.Jackson S.Janchiv J.H.Jeong Q.Ji Q.P.Ji W.Ji X.B.Ji X.L.Ji Y.Y.Ji X.Q.Jia Z.K.Jia D.Jiang H.B.Jiang P.C.Jiang S.S.Jiang T.J.Jiang X.S.Jiang Y.Jiang J.B.Jiao J.K.Jiao Z.Jiao S.Jin Y.Jin M.Q.Jing X.M.Jing T.Johansson S.Kabana N.Kalantar-Nayestanaki X.L.Kang X.S.Kang M.Kavatsyuk B.C.Ke V.Khachatryan A.Khoukaz R.Kiuchi O.B.Kolcu B.Kopf M.Kuessner X.Kui N.Kumar A.Kupsc W.Kühn J.J.Lane P.Larin L.Lavezzi T.T.Lei Z.H.Lei M.Lellmann T.Lenz C.Li C.Li C.H.Li Cheng Li D.M.Li F.Li G.Li H.B.Li H.J.Li H.N.Li Hui Li J.R.Li J.S.Li Ke Li L.J.Li L.K.Li Lei Li M.H.Li P.R.Li Q.M.Li Q.X.Li R.Li S.X.Li T.Li W.D.Li W.G.Li X.Li X.H.Li X.L.Li X.Z.Li Xi institute of High Energy Physics Beijing 100049China Beihang university Beijing 100191China Bochum Ruhr-university D-44780BochumGermany Budker institute of Nuclear Physics SB RAS(BINP) Novosibirsk 630090Russia Carnegie Mellon university PittsburghPennsylvania 15213USA Central China Normal university Wuhan 430079China Central South university Changsha 410083China China Center of Advanced Science and Technology Beijing 100190China China university of Geosciences Wuhan 430074China Chung-Ang university Seoul06974Republic of Korea COMSATS university Islamabad Lahore CampusDefence RoadOff Raiwind Road54000LahorePakistan Fudan university Shanghai 200433China GSI Helmholtzcentre for Heavy Ion Research GmbH D-64291DarmstadtGermany guangxi Normal {1. Guilin 541004China guangxi {1. Nanning 530004China Hangzhou Normal university Hangzhou 310036China Hebei university Baoding 071002China Helmholtz institute Mainz Staudinger Weg 18D-55099MainzGermany Henan Normal university Xinxiang 453007China Henan university Kaifeng 475004China Henan university of Science and Technology Luoyang 471003China Henan university of Technology Zhengzhou 450001China Huangshan College Huangshan 245000China Hunan Normal university Changsha 410081China Hunan university Changsha 410082China Indian institute of Technology Madras Chennai 600036India Indiana university BloomingtonIndiana 47405USA INFN Laboratori Nazionali di Frascati (A)INFN Laboratori Nazionali di FrascatiI-00044FrascatiItaly(B)INFN Sezione di PerugiaI-06100PerugiaItaly(C)University of PerugiaI-06100PerugiaItaly INFN Sezione di Ferrara (A)INFN Sezione di FerraraI-44122FerraraItaly(B)University of FerraraI-44122FerraraItaly Inner Mongolia university Hohhot 010021China institute of Modern Physics Lanzhou 730000China institute of Physics and Technology Peace Avenue 54BUlaanbaatar 13330Mongolia Instituto de Alta Investigación Universidad de TarapacáCasilla 7DArica 1000000Chile Jilin university Changchun 130012China Joha

The number ofψ(3686)events collected by the BESⅢdetector during the 2.2. run period is determined to be(2.59.3±1..1.×1.~6 by counting inclusiveψ(3686)hadronic *** uncertainty is systematic and the statistical uncertainty is ***,the numbers ofψ(3686)events collected during the 2.09 and 2.1.0}un periods are updated to be(1.7.7±0.6)×1.~6 and(345.4±2.6)×1.~6,*** numbers are consistent with the previous measurements within one standard *** total number ofψ(3686)events in the three data samples is(2.1.0}4±1..3)×1.~6.

关键词： ψ(3686) inclusive process Hadronic events BESⅢdetector

祁连山青海云杉中龄林混交度对细根形态特征的影响

在线全文

维普期刊数据库

学校读者我要写书评

暂无评论

林业科学 2020年第1期56卷 191-200页

作者：邓磊朱春云于世川祁银燕张文辉杜盛关晋宏青海大学农林科学院西宁810016 西北农林科技大学林学院杨凌712100 西北农林科技大学水土保持研究所杨凌712100 中国科学院水利部水土保持研究所杨凌712100 德国马克斯-普朗克学会生物地球化学研究所耶拿07745 青海省高原林木遗传育种重点实验室西宁810016

【目的】研究青藏高原东部祁连山地区青海云杉中龄林混交度对各土层细根生物量和形态特征的影响,以期为当地森林恢复和林分经营提供理论依据。【方法】选择混交度分别为0、0.2.0.4和0.6的青海云杉天然中龄林样地,调查混交度对0~2.和2.~... 详细信息

【目的】研究青藏高原东部祁连山地区青海云杉中龄林混交度对各土层细根生物量和形态特征的影响,以期为当地森林恢复和林分经营提供理论依据。【方法】选择混交度分别为0、0.2.0.4和0.6的青海云杉天然中龄林样地,调查混交度对0~2.和2.~40 cm土层各树种细根生物量密度、比根长、比表面积、根表面积密度和根长密度的影响。【结果】混交度为0.4的青海云杉林以1.~2. cm径级(63.72.)、2.~32.m高度级(48.72.)和1.~2. m高度级(1..1.%)乔木占比最大,且均显著高于其他3个混交度的林分;青海云杉林总细根生物量密度主要分布在0~2. cm土层,占细根总量的68.31.~83.49%,其数值随混交度增大呈现先升后降趋势,混交度0.4时最大,为61..2. g·m^-3;2.~40 cm土层总细根生物量密度随混交度增大而增大,在混交度0.6时最大,为2.7.1.g·m^-3;在0~2. cm土层,细根根长密度和根表面积密度表现为混交度0.4>混交度0.2.混交度0>混交度0.6,比根长和比表面积表现为混交度0.4>混交度0.2.混交度0.6>混交度0;在2.~40 cm土层,根长密度、根表面积密度和比根长均表现为混交度0.6>混交度0.4>混交度0.2.混交度0,比表面积表现为混交度0.6>混交度0.2.混交度0.4>混交度0;随混交度增大,云杉对0~40 cm土层林分细根生物量密度、比根长、比表面积、根表面积密度和根长密度的贡献逐渐减小,而白桦对0~40 cm土层林分细根生物量密度、比根长、比表面积、根表面积密度和根长密度的贡献持续增大;混交度对细根根长密度和根表面积密度的影响主要表现在0~1.mm径级细根上。【结论】与其他混交度林分相比,混交度为0.4的青海云杉中龄林具有更合理的径级结构和高度级结构,异龄、复层的林分结构可以减小相邻植株间生态位竞争重叠范围,优化林分空间利用效率,提高群落稳定性,细根生物量密度及细根形态特征如比根长、比表面积、根表面积密度和根长密度达到最大。在未来青海云杉中龄林经营中,合理控制混交度在0.4左右,可促进群落细根发育,利于森林持续健康发育。

关键词：混交度青海云杉中龄林林分结构细根分布生物量形态特征