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Paleoenvironment and organic matter enrichment of the Carboniferous volcanic-related source rocks in the Malang Sag,Santanghu Basin,NW China

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Petroleum Science 2021年第1期18卷 29-53页

作者： tian-jun li Zhi-Long Huang Xuan Chen Xin-Ning li jun-tian liu State Key Laboratory of Petroleum Resources and Prospecting China University of Petroleum(Beijing)Beijng 102249China College of Geosciences China University of Petroleum(Beijing)Beijing 102249China Research Institute of Exploration and Development PetroChina Tuha Oilfield CompanyHamiXinjiang 839009China

Volcanic activity was quite frequent during the deposition of the Late Carboniferous Ha’erjiawu Formation in the Santanghu *** petrology and organic and inorganic geochemical indicators were used to investigate hydrocarbon potential,paleoenvironmental conditions and organic matter enrichment of the *** results show that the oil generation capacity of the Ha’erjiawu Formation mudstones,which has abundant oil-prone organic matter(TypeⅡkerogen with hydrogen index values mainly ranging from 250 to 550 mg HC/g TOC)in mature stage(Tmax values mainly ranging from 435 to 450℃),is *** Ha’erjiawu Formation was deposited in a dysoxic,freshwater-mildly brackish,and warm-humid *** its deposition,the Ha’erjiawu Formation received hydrothermal *** volcanic hydrothermal activities played an important role in the organic matter *** addition,the total organic carbon(TOC)is significantly positively correlated with the felsic mineral content,but it is negatively correlated with the carbonate mineral content and C27/C29 ratios,indicating that terrigenous organic matter input also contributed to the primary productivity in the surface ***,the formation of the high-quality source rocks in the Ha’erjiawu Formation was jointly affected by the hydrothermal activity and the terrigenous organic matter input.

关键词： Organic-rich rocks Paleoenvironment Organic matter enrichment Hydrothermal activity Ha’erjiawu Formation Santanghu Basin

Excitation Spectrum of Spin-1 Bosonic Atoms in Mott Insulating Phase

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Communications in Theoretical Physics 2006年第1期45卷 87-94页

作者： HOU Jing-Min tian li-jun Department of Physics Southeast University Nanjing 210096 China Theoretical Physics Division Nankai Institute of Mathematics Nankai University Tianjin 300071 China Department of Physics Shanghai University Shanghai 200436 China

The effective action for spin-1 bosonic atom in an optical lattice is derived. The quasiparticle and quasihole dispersions are calculated for different cases by using a functional integral formalism. For all cases, th... 详细信息

关键词： collective excitations optical lattice Mort-insulating phase spinor atoms

Note on a Theorem of Bangert

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Acta Mathematica Sinica,English Series 2012年第1期28卷 121-132页

作者： tian jun li Wei Wei WU University of Minnesota Department of Mathematics

We generalize Bangert＇s non-hyperbolicity result for uniformly tamed almost complex structures on standard symplectic R^2n to asymptotically standard symplectic manifolds.

关键词： (Non-)complex hyperbolicity asymptotically standard rationally connected almost Kahler

Collective Excitations in Spin-2 Bose-Einstein Condensates

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Communications in Theoretical Physics 2005年第6X期44卷 1025-1036页

The Green＇s functions and the correlation functions in spin-2 Bose-Einstein condensates at finite temperature are defined and the generalized Dyson-Beliaev equations are introduced. We discuss the spin conservation in z direction and decouple the Green＇s functions and the generalized Dyson-Beliaev equations according to different spin conservations in z direction. The anomalous vertex functions are introduced and the self-energies are separated into the proper self-energies and the improper self-energies. The generalized Dyson-Beliaev equations are decoupled according to separation of the self-energies. We calculate the Green＇s functions step by step in the Bogoliubov approximation and discuss the collective excitations in spin-2 Bose-Einstein condensates in the polar, ferromagnetic, and cyclic cases, respectively.

关键词： Bose-Einstein condensates collective excitations Green's function

THE MINIMAL GENUS PROBLEM—A QUARTER CENTURY OF PROGRESS

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Acta Mathematica Scientia 2022年第6期42卷 2257-2278页

作者： Josef G.DORFMEISTER tian-jun li Department of Mathematics North Dakota State UniversityFargoND 58102USA School of Mathematics University of MinnesotaMinneapolisMN 55455USA

This paper gives a survey of the progress on the minimal genus problem since Lawson's[26]survey.

关键词： four manifolds minimal genus adjunction-type inequality circle sum

Symplectic Blowing Down in Dimension Six

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Acta Mathematica Sinica,English Series 2022年第10期38卷 1831-1855页

作者： tian-jun li Yong Bin RUAN Wei Yi ZHANG School of Mathematics University of MinnesotaMinneapolisMN 55455USA Institute for Advanced Study in Mathematics East No.7 BuildingZhejiang University Zijingang CampusHangzhou 310058P.R.China Mathematics Institute University of WarwickCoventryCV47ALUK

We establish a blowing down criterion in the context of birational symplectic geometry in dimension 6.

关键词： Symplectic birational geometry symplectic blowing down

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Sudden Transition in Quantum Discord Dynamics:Role of Three-Site Interaction

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Chinese Physics Letters 2013年第5期30卷 10-13页

作者： tian li-jun ZHANG Cai-Yun QIN li-Guo Department of Physics Shanghai UniversityShanghai 200444 Shanghai Advanced Research Institute Chinese Academy of SciencesShanghai 201210

We investigate the dynamics of quantum discord for a two-qubit system coupled to a spin chain with three-site interaction in the weak-coupling *** the case of the initial two-qubit pure state,the decay of quantum discord can be delayed in a special interval of the three-site coupling *** the absence of the transverse field,with the increase of three-site interaction,quantum discord tends to be *** the case of the initial mixed state,the increase of quantum discord is delayed in the special interval of three-site *** addition,a sudden transition between classical and quantum decoherence is also observed,with the transition time determined by the three-site interaction and degree of anisotropy.

关键词： interaction quantum interaction

Entanglement of Two-Superconducting-Qubit System Coupled with a Fixed Capacitor

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Chinese Physics Letters 2011年第5期28卷 42-45页

作者： tian li-jun QIN li-Guo ZHANG Hong-Biao Department of Physics Shanghai UniversityShanghai 200444 Shanghai Key Lab for Astrophysics Shanghai 200234 Institute of Theoretical Physics Northeast Normal UniversityChangchun 130024

We study thermal entanglement in a two-superconducting-qubit system in two cases,either identical or *** calculating the concurrence of system,we find that the entangled degree of the system is greatly enhanced in the case of very low temperature and Josephson energies for the identical superconducting qubits and our result is in a good agreement with the experimental data.

关键词： identical system Fixed

Uniruled Symplectic Divisors

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Communications in Mathematics and Statistics 2013年第2期1卷 163-212页

作者： tian-jun li Yongbin Ruan School of Mathematics University of MinnesotaMinneapolisMN 55455USA Department of Mathematics University of MichiganAnn ArborMIUSA

In this article,we consider the problem of lifting the GW theory of a symplectic divisor to that of the ambient manifold in the context of symplectic birational *** particular,we generalizeMaulik-Pandharipande’s relative/absolute correspondence to relative-divisor/absolute ***,we use it to lift a minimal uniruled invariant of a divisor to that of the ambient manifold.

关键词： Birational symplectic geometry Gromov–Witten invariants Symplectic divisor Uniruled invariant