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Constraints of authigenic carbonates on trace elements (Sr,Mg) of lacustrine ostracod shells in paleoenviron-ment reconstruction and its mechanism

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Science china earth sciences 2008年第5期51卷 654-664页

作者： HU Guang1,2, JIN ZhangDong1 & ZHANG Fei3.1 State Key Laboratory of Loess and Quaternary Geology, Institute of earth Environment, Chinese Academy of sciences, Xi’an 710075, china 2 Graduate {3. of the Chinese Academy of sciences, Beijing 100049, china 3.College of Resources and Environmental Science, nanjing Agricultural {3., nanjing 210095, china State Key Laboratory of Loess and Quaternary Geology Institute of Earth Environment Chinese Academy of Sciences Xi’an China Graduate university of the Chinese Academy of sciences Beijing China College of Resources and Environmental Science Nanjing Agricultural University Nanjing China

Molar ratios of Mg/Ca and Sr/Ca were measured in two species of ostracod shells preserved in the upper core (15–55 m) of the Hequing Basin in Yunnan Province, southwest china. By correlating the molar ratios between Mg/Ca and Sr/Ca and comparing them with Sr concentrations of the sediments, we suggested that: (1) the molar Mg/Ca and Sr/Ca ratio variations in respective ostracod primo reflected the changes in its ambient water composition and ecology; (2) the molar Sr/Ca ratios responded better to the salinity change linearly than Mg/Ca without aragonite precipitation in the system, and otherwise there was no linear relation between them; and (3. the molar Sr/Ca ratios were mainly controlled by salinity and authigenic carbonate precipitation, whereas the molar Mg/Ca ratios were related to both salinity and temperature. In fact, the rate of ostracod growth owing to temperature controls the fluctuation of Mg/Ca in shells. Here, more attentions should be paid to the constraint of authigenic mineral precipitation processes on the trace elements in ostracod shells and to the correlation between these trace elements in biogenic carbonates and compositions of the sediments in systems and in future in vitro experiments.

关键词： ostracod shell molar Sr/Ca ratio molar Mg/Ca ratio environmental response Heqing Basin

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The Lanshantou Kyanite-bearing Eclogite with Coesite Inclusions in the Sulu Ultrahigh-Pressure Metamorphic Belt and Its PTt Path

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Acta Geologica Sinica(English Edition) 2001年第4期75卷 409-420页

作者： HU Shouxi, SUN Jinggui, LING Hongfei, YE Ying, Fang Changquan and ZHAO Yiying department of earth sciences,{3., nanjing 210008, Jiangsu department of earth sciences, Zhejiang university, Hangzhou 3.0027, Zhejiang nanjing Univ Dept Earth Sci Nanjing 210008 Peoples R China Zhejiang Univ Dept Earth Sci Hangzhou 310027 Peoples R China

Coesite inclusions are found in kyanite from the Lanshantou eclogite in the Sulu ultrahigh-pressure (UHP) metamorphic belt. This discovery extends the stable region of kyanite to over 2.4 GPa. As an important UHP metamorphic belt in china, the Sulu eclogite belt is the product of A-subduction induced by strong compression of the Yellow Sea terrane to the Jiaodong-northereastern Jiangsu terrane during the interaction of the Eurasian plate and Palaeo-Pacific plate in the Indosinian. It stretches about 3.0 km and contains over 1000 eclogite bodies. Most eclogites in this belt belong to Groups B and C in the classification of Coleman et al., and commonly contain kyanite, while the Lanshantou eclogite belongs to Group A and contains coesite. The MgO, CaO and FeO contents in garnet and pyroxene show regular variation from the core to the rim, which reveals the PTt paths of progressive metamorphism during the Early Mesozoic (240-200 Ma) and retrogressive metamorphism during the Late Mesozoic and Cenozoic exhumation.

关键词： coesite-bearing kyanite eclogite ultrahigh-pressure (UHP) metamorphic belt PTt path of subduction and exhumation

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Exploration of Water Resource and Multiple Model for Water Resource Development in Karst Areas with the Preferred Plane Theory

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Acta Geologica Sinica(English Edition) 2003年第1期77卷 129-135页

作者： LUO Guoyu, YAN Changhong, LI Xiaozhao, JIANG Jianping and MA Ji department of earth sciences,{3., nanjing, Jiangsu 2.0093 nanjing Univ Dept Earth Sci Nanjing 210093 Jiangsu Peoples R China

According to the theory of preferred plane, preferred planes (faults) alwayscontrol the distribution of bedrock fissure water and hold abundant groundwater. Thus, theexploration of fissure or karst water can be converted into searching for the watery preferred plane(WPP). In the paper, the characteristic of watery preferred planes is analyzed and a series ofsuperior indices has been set up. It is introduced that WPPs are determined by the methods ofgeological analysis, superior index and complex geophysical analysis. Meanwhile, new multiple modelfor water resource development in the water-scarce areas of karst mountainous regions are advanced.

关键词： theory of preferred plane karst water multiple model for water resourcedevelopment

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Some new results on planar harmonic mappings

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Science china Mathematics 2010年第3期53卷 597-604页

作者： CHEN HuaiHui department of Mathematics, nanjing Normal university, nanjing 210097, china department of Mathematics Nanjing Normal University Nanjing China

This survey paper contains some new results on the Landau theorem, Bloch theorem and Schwarz-Pick lemma for planar harmonic mappings.

关键词： harmonic mapping Landau theorem Bloch constant Schwarz-Pick lemma quasi-regularity

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Quasi-periodic solutions with prescribed frequency in a nonlinear Schrdinger equation

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Science china Mathematics 2010年第12期53卷 3067-3084页

作者： REN Xiu-Fang department of Mathematics, nanjing university, nanjing 2.0093. china department of Mathematics Nanjing University Nanjing China

In this paper, one-dimensional (1D) nonlinear Schrdinger equation iut-uxx + Mσ u + f ( | u | 2 )u = 0, t, x ∈ R , subject to periodic boundary conditions is considered, where the nonlinearity f is a real analytic function near u = 0 with f (0) = 0, f (0) = 0, and the Floquet multiplier Mσ is defined as Mσe inx = σne inx , with σn = σ, when n 0, otherwise, σn = 0. It is proved that for each given 0 1, the above equation admits a Whitney smooth family of small-amplitude quasi-periodic solutions with b-dimensional Diophantine frequencies, corresponding to b-dimensional invariant tori of an associated infinite-dimensional Hamiltonian system. Moreover, these b-dimensional Diophantine frequencies are the small dilation of a prescribed Diophantine vector. The proof is based on a partial Birkhoff normal form reduction and an improved KAM method.

关键词： Schrdinger equation Hamiltonian system Birkhoff normal form quasi-periodic solution

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THE UNIQUENESS OF BIFURCATION TO SEPARATRIX LOOPS IN SUPERCRITICAL CASES

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Chinese Annals of Mathematics,Series B 1994年第4期15卷 493-500页

作者： SUN JIANHUA (department of Mathematics, nanjing university, nanjing 210008, {3..) 南京大学数学系江苏南京

In paper[4]the existence of bifurcation to separatrir loops in supercritical cases on the planeis studied. This note is a continuation of [4].The author proves the uniqueness of limit cyclesin a neighborhood of the sa... 详细信息

关键词： Supercritical Separatrir loop Bifurcation Limit cycle Uniqueness.

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Resistin-binding peptide antagonizes role of resistin on white adipose tissue

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Acta Pharmacologica Sinica 2007年第2期28卷 221-226页

作者： Nan GU~(2,3.4) Shu-ping HAN~(2,4) Li FEI~3.Xiao-qin PAN~3.Mei GUO~3.Rong-hua CHEN~3.Xi-rong GUO~(2,3.5)2 department of Pediatrics,nanjing Maternal and Child Health Hospital of nanjing Medical {3.,nanjing 210029,china 3.Pediatric Research Institute of nanjing Medical {3.,nanjing 210029,china department of Pediatrics Nanjing Maternal and Child Health Hospital of Nanjing Medical University Nanjing China Pediatric Research Institute of nanjing Medical university Nanjing China

Aim:To investigate the direct effects of resistin and resistin-binding peptide（RBP）on lipid metabolism and endocrine function in adipose ***:Ratwhite adipose tissue was cultured in vitro and incubated for 24 h with 3. ng/mLrecombinant rat resistin protein（rResistin）or combined with RBP of varyingconcentrations(1×1-12mol/L,1×10-10mol/L,1×10-8mol/L).Free fatty acids（FFA）released into medium was measured by a colorimetric *** levels of proteinsecretion and mRNA expression of TNF-α and adiponectin were detected by ELISAkit and RT-PCR ***:The levels of FFA released into mediumwere significantly increased after 24 h of exposure to rResistin,but significantlydecreased after RBP was applied,although there was no difference between the *** protein level and gene expression of TNF-αin adipose tissuewere significantly increased after 24 h of exposure to rResistin,but only obviouslydecreased after incubated with 1×10-8mol/L *** levels of protein secretionand mRNA expression of adiponectin in adipose tissue were significantly de-creased after 24 h of exposure to rResistin,but increased after incubated with RBPwith the higher ***:RBP can effectively antagonize therole of resistin on the lipid metabolism and endocrine function of adipose tissue.

关键词： resistin resistin-binding peptide white adipose tissue lipid metabolism endocrine function

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Statistic Characteristics of Logistic Iteration and its Application inGenerating Even Distributed Random Numbers

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Communications in Nonlinear Science and Numerical Simulation 1998年第2期3卷 3-5页

作者： Nailong GUO (department of Aerodynamics, nanjing university of Aeronautics and Astronautics, nanjing 210016, {3.) department of Aerodynamics Nanjing University of Aeronautics and Astronautics Nanjing 210016 China

ＩｎｔｒｏｄｕｃｔｉｏｎＬｏｇｉｓｔｉｃｉｔｅｒａｔｉｏｎｐｒｏｖｉｄｅｓａｓｉｍｐｌｅｍａｔｈｅｍａｔｉｃａｌｍｏｄｅｌｔｏｅｘｈｉｂｉｔｃｈａｏｔｉｃｂｅｈａｖｉｏｒａｎｄｈａｓｂｅｅｎｒｅｓｅａｒｃｈｅｄｂｙａ... 详细信息

ＩｎｔｒｏｄｕｃｔｉｏｎＬｏｇｉｓｔｉｃｉｔｅｒａｔｉｏｎｐｒｏｖｉｄｅｓａｓｉｍｐｌｅｍａｔｈｅｍａｔｉｃａｌｍｏｄｅｌｔｏｅｘｈｉｂｉｔｃｈａｏｔｉｃｂｅｈａｖｉｏｒａｎｄｈａｓｂｅｅｎｒｅｓｅａｒｃｈｅｄｂｙａｌｏｔｏｆｒｅｓｅａｒｃｈｅｒｓ［...

关键词： Logistic iteration even distributed random numbers statistic characteristics

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Birkhoff's theorem and viscosity solutions of Hamilton-Jacobi equations

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Science china Mathematics 2009年第8期52卷 1796-1800页

作者： CHENG Wei department of Mathematics, nanjing university, nanjing 2.0093. china department of Mathematics Nanjing University Nanjing China

We obtain a partial generalization of Birkhoff's theorem of invariant curve to higher dimesional case in the context of viscosity solutions of Hamilton-Jacobi equations, or weak KAM theory. This is a new approach afte... 详细信息

关键词： Hamilton-Jacobi equation viscosity solution semiconcave function

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Nonlinear boundary value problems for discontinuous delayed differential equations

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Applied Mathematics(A Journal of Chinese Universities) 2010年第1期25卷 9-17页

作者： SUN Wu-jun department of Finance & Insurance, Business School of nanjing university, nanjing 2.0093. china department of Finance and Insurance Business School of Nanjing University Nanjing China

In this paper nonlinear boundary value problems for discontinuous delayed differen- tial equations are considered. Some existence and boundedness results of solutions are obtained via the method of upper and lower solutions, which may be discontinuous. Our analysis can be applied to those phenomena from physics and control theory which have been successfully described by delayed differential equations with discontinuous functions, such as electric, pneu- matic, and hydraulic networks. It is also an important step to precede the design of control signals when finite-time or practical stability control are concerned.

关键词： Nonlinear boundary value problems upper and lower solutions discontinuous delayed differentialequations Carath^odory conditions existence of solutions.

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