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Magma Generation of Magnetite-Rich Intermediate-Mafic Rocks and Its Mantle Processes in the Southwestern Alxa Block,NW China

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Journal of Earth Science 2022年第1期33卷 161-176页

作者： Lu Tao Hongfei Zhang jing Wu Xiaochun Zhou Liqi Zhang State Key Laboratory of Geological Processes and Mineral Resources China University of GeosciencesWuhan 430074China School of Earth Sciences China University of GeosciencesWuhan 430074China Gemmological Institute China University of GeosciencesWuhan 430074China Faculty of Earth Resources China University of GeosciencesWuhan 430074China

Many studies focus on mineralization of huge magnetite ore deposits and petrogenesis of their large-volume host ***,magma generation of those small-scale intrusions with enrichment of magnetite is poorly reported and paid attention *** here carry out an integrated study of magnetite chemistry,U-Pb zircon dating,geochemistry,and Sr-Nd-Hf isotopes for the magnetite-rich intermediate-mafic rocks from the Helishan pluton in the southwestern Alxa Block,Northwest ***,together with several previously reported magnetite/iron-rich intrusions nearby,is capable of providing some constraints on magma generation of magnetite/iron-rich intrusive *** Helishan pluton,dated at ca.290 Ma,consists of hornblende gabbro,diorite,and quartz monzodiorite with~3%-5%magnetite in all the *** on magnetite chemistry manifests a magmatic origin for *** the lithologies display high TFeO/MgO ratio (1.71-1.89),weakly fractionated REE patterns((La/Yb)_(N)=1.82-10.17),enrichment of Rb,Sr,and Pb,and depletion of high field strength *** have (^(87)Sr/^(86)Sr)_(i) values of 0.705 2 to 0.705 8,ε_(Nd)(t) values of+0.03 to+0.64,and zircon ε_(Hf)(t) values of +6.5 to+*** propose that they were derived from partial melting of iron-rich metasomatized lithospheric *** systematic variations of Sr/Y ratios and Nd-Hf isotopic compositions with time for the Paleozoic igneous rocks at the southwestern Alxa Block indicate ever existence of thinning and rebirth of lithospheric *** geodynamic process could be the potential mechanism to give rise to the iron-rich signature of the reborn mantle sources of the Helishan *** intermediatemafic intrusions at subduction zones,they are unlikely to form considerable magnetite ore deposits since their modest magmatic flux and early fractional crystallization of magnetite at a high oxygen fugacity and H_(2)O condition.

关键词： geochemishtry magnetite-rich intrusion mantle source petrogenesis lithospheric process Alxa Block Northwest China

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Nutrient dynamics and cross shelf transport in the East China Sea

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Acta Oceanologica Sinica 2024年第10期43卷 48-62页

作者： Shuhang Dong Sumei Liu jingling Ren Feng Zhou jing Zhang Frontiers Science Center for Deep Ocean Multispheres and Earth System and Key Laboratory of Marine Chemistry Theory and TechnologyMinistry of EducationOcean University of ChinaQingdao 266100China Laboratory for Marine Ecology and Environmental Science Qingdao National Laboratory for Marine Science and TechnologyQingdao 266237China State Key Laboratory of Satellite Ocean Environment Dynamics Second Institute of OceanographyMinistry of Natural ResourcesHangzhou 310012China State Key Laboratory of Estuarine and Coastal Research East China Normal UniversityShanghai 200062China School of Oceanography Shanghai Jiao Tong UniversityShanghai 200030China

To understand the temporal and spatial variations in nutrient dynamics,as well as the potential cross-shelf transport of nutrients between the East China Sea(ECS)shelf and the northwestern Pacific Ocean,six field observations covering the ECS were conducted in spring,summer,and autumn in 2011 and *** dynamics in the ECS and nutrient exchange between shelf water and the open ocean were *** concentrations of dissolved inorganic nutrients were detected in the nearshore surface layer and offshore bottom layer in different seasons,and the concentrations of dissolved inorganic nutrients in surface seawater were lower in summer and autumn than in *** concentrations of dissolved organic nutrients in Kuroshio surface water were slightly lower in summer than in spring,but the concentrations in Kuroshio subsurface water were slightly higher in summer than in *** were abundant nutrient reservoirs in the euphotic zone of the ECS,which explained the high primary *** evaluation of cross-shelf transport indicated that nutrients from shelf water were transported out across the 200 m isobath through the surface layer with the density(σ)less than 23.0 kg/m^(3) in *** flux of dissolved inorganic nitrogen transported from the ECS shelf to the Northwest Pacific Ocean in spring was equivalent to 21%of the atmospheric nitrogen deposition in the Northwest Pacific *** summer,the onshore flux in the surface and bottom layers accounted for 80%of the total flux,and the transportation of nutrients along the surface layer to the continental shelf contributed to the nutrient storage and primary productivity of the euphotic zone in the ECS shelf in summer.

关键词： nutrients cross shelf transportation Kuroshio East China Sea(ECS) Northwest Pacific Ocean

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NUMERICAL ANALYSIS OF NONLINEAR STABILITY FOR RAILWAY PASSENGER CARS

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Chinese Journal of Mechanical Engineering 2001年第2期14卷 97-101页

作者： Zeng jing National Traction Power Laboratory, Southwest Jiaotong University 西南交通大学牵引动力国家重点实验室四川成都

The Newton Raphson iteration and QR algorithm are combined to search the Hpf bifurcation point of the vehicle running on straight track and on large radius curved tracks. Limit cycles that are bifurcated from the equilibrium points and the saddle node bifurcation point are computed through employing a variable step Runge Kutta method and the Poincaré map. Finally, numerical simulations are carried out for the stability of a high speed passenger car operating on straight and large radius curved tracks. The influences of the radius of curvature and the superelevation of the track on the stability of the vehicle system are investigated.

关键词： Railway passenger car Stability Bifurcation Limit cycle Critical speed

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Inhomogeneous Shadowing Effect in High-Energy p-A Drell-Yan Process:

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Communications in Theoretical Physics 2008年第7期50卷 175-179页

作者： WANG Hong-Min SUN Xian-jing ZHANG Ben-Ai Physics Department Academy of Armored Forces Engineering of PLA Beijing 100072 China Institute of High Energy Physics the Chinese Academy of Sciences Beijing 100049 China Institute of Applied Physics and Computational Mathematics Beijing 100088 China

Having studied the initial state energy loss versus nuclear shadowing for the Drell-Yan dimuon pairproduction in the color string model,the inhomogeneous shadowing effect is considered in this *** find thatthe inhomogeneous shadowing effect does amend the rate of energy loss per unit path length,-dE/***,thetheoretical results for the Drell-Yan differential cross-section ratios are compared with the E772 and E866 *** isfound that the theoretical results are in good agreement with the experimental data.

关键词： inhomogeneous shadowing effect color string model Drell Yan process

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ENST00000535926 is an unfavorable prognosis-related and tumorpromoting transcript of the CHPF gene in luminal A and B breast cancer

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BIOCELL 2023年第2期47卷 309-318页

作者： jing LUO JIANPING HE YONG LUO CHENG YI Cancer Center West China HospitalSichuan UniversityChengdu610041China Department of Breast Surgery Sichuan Academy of Medical Science&Sichuan Provincial People’s HospitalChengdu610072China

Chondroitin sulfate synthase 2(CHPF)is characterized as an oncogenic and poor prognosis-related gene in breast ***,this gene has alternative splicing products encoding proteins of different *** cancer is a group of heterogeneous tumors with distinct clinical and genomic *** this study,we explored the expression profile and prognostic value of the two transcripts of CHPF using data from The Cancer Genome Atlas(TCGA)-*** functional regulation of the two transcripts was also studied in MCF-7 and BT-474 *** the two transcripts of CHPF,ENST00000535926 expression was significantly upregulated in the tumor samples and was the dominant ***00000535926,but not ENST00000243776 upregulation,was associated with significantly worse progression-free survival(PFS)and disease-specific survival(DSS)in luminal A/B ***,no significant association was observed in PFS or DSS in other Prediction Analysis of Microarray 50(PAM50)*** isoform 2 protein(encoded by ENST00000535926)significantly elevated the expression of P3H1 and RCN3 at the mRNA and protein levels in MCF-7 and BT-474 *** effect of ENST00000535926 was significantly stronger than ENST00000243776 in promoting tumor cell colony *** expression of P3H1 and RCN3 was negatively correlated with CD8+T cell infiltration but was positively correlated with cancer-associated fibroblast infiltration in luminal A/B *** summary,this study revealed that ENST00000535926 is an unfavorable prognosis-related and tumor-promoting transcript of the CHPF gene in luminal A/B breast cancer.

关键词： Breast cancer CHPF ENST00000535926 Luminal A Luminal B

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A developed HPLC method for the determination of Alogliptin Benzoate and its potential impurities in bulk drug and tablets

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Asian Journal of Pharmaceutical Sciences 2015年第2期10卷 152-158页

作者： Kun Zhang Panqin Ma Wenna jing Xiangrong Zhang School of Pharmacy Shenyang Pharmaceutical UniversityNo.103Wenhua RoadShenyang110016China Kangya of Ningxia Pharmaceuticals CO.LTD No.57Fuan West LaneYinchuan750003China School of Medical Devices Shenyang Pharmaceutical UniversityNo.103Wenhua RoadShenyang110016China

Alogliptin(AGLT),active ingredient of Alogliptin Benzoate(AGLT-BZ),is a new dipeptidyl peptidase-4(DPP-4)inhibitor for the treatment of type 2 *** study aimed to build a suitable method to determine the potential related substances in AGLT-BZ bulk drug and *** related substances in Alogliptin Benzoate substances were synthetized and identified by ^(1)H-NMR and *** addition,the impurities were detected by a gradient reverse-phase high performance liquid chromatography(RP-HPLC)with UV *** chromatographic system consisted of an Angilent Zobax SB-CN column(250×4.6 mm;5 μm).The mobile phase consisted of water/acetonitrile/trifluoroacetic acid 1900:100:1 v/v/v(solution A)and acetonitrile/water/trifluoroacetic acid 1900:100:1 v/v/v(solution B)using a gradient program at a flow rate of 1.0 ml/min with 278 nm detection and an injection volume of 20 ***,selectivity,the limit of quantitation(LOQ)and limit of detection(LOD),linearity,accuracy,precision and robustness were *** was good over the concentration range 50-1000 ng/ml and the coefficient of determination(R^(2))were ***% of the determination of precision were <2%(n=6).The method of RP-HPLC for the determination of impurities in AGLT-BZ was proved to be precise,accurate,robust and *** batches of self-made bulk drug and three dosages of commercial tablets were detected with this method.

关键词： Alogliptin benzoate Impurity HPLC Bulk drug Commercial tablets

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Tri(4-methoxybenzyloxyl)(pentamethylcyclopentadienyl)titanium/Modified MAO Catalyzed Polymerization of 1-Butene

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China Petroleum Processing & Petrochemical Technology 2014年第3期16卷 69-76页

作者： Wang jing Zhou Lu Jiang Wanhe Huang Qigu State Key Laboratory of Chemical Resource Engineering Key Laboratory of Carbon Fiber and Functional Polymers Ministry of Education Beijing University of Chemical Technology

Tri(4-methoxy-1-benzyloxyl)(pentamethylcyclopentadienyl)titanium(Cp*Ti(OBzOCH3)3) in conjunction with modified methylalumoxane(mMAO) was an efficient catalyst for the living polymerization of butene-1. The steric and highly electron-releasing nature of the catalyst was probably responsible for the resulting polymers with high molecular weight and narrow molecular weight distribution(Mw/Mn=1.25 to 1.36). The effects of polymerization conditions on the catalytic activity, molecular weight and stereo-regularity of the products were investigated in detail. Especially, the content of TMA in MAO used in polymerization of butene-1 had a profound influence on polymer microstructure. The structural properties of the polybutene-1 product were characterized by 13 C NMR, GPC, DSC and WAXD. The results indicated that the polybutene-1 was isotacticity-rich(at 0 ℃, [mmmm] reached up to 60.3%) and the relative content of methylene pentad sequences [mmmm] of the polymer increased with a decreasing temperature.

关键词： half-metallocene polybutene-1 narrow-dispersity stereo-regularity

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Dynamics of a dengue epidemic model with class-age structure

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International Journal of Biomathematics 2017年第8期10卷 63-85页

作者： Wen-jing Feng Li-Ming Cai Kaihui Liu Department of Mathematics and StatisticsXinyang Normal University Xinyang 464000 P. R. China Department of Applied MathematicsThe Hong Kong Polytechnic University Hong Kong SAR P. R. China

We introduce the class-age-dependent rates of the infected and vaccinated class in the compartmental model of dengue transmission. An age-structured host-vector interac- tion model incorporating vaccination effects is formulated and analyzed for the spread of dengue. Moreover, the basic reproduction number is derived, which serves as a thresh- old value determining the stability of the equilibrium points. By constructing suitable Lyapunov functional, the global asymptotic stability of the equilibria of the model is established in terms of the basic reproduction number. In particular, the disease-free equilibrium of the model is globally asymptotically stable if the basic reproduction num- ber is less than one, while the disease persists and the unique endemic equilibrium is globally asymptotically stable if the basic reproduction number is greater than one. The analysis of our model indicates that our model is realistic to give a hint to control the transmission of dengue. Furthermore, it follows from the formulation of the infection-free equilibrium of susceptible humans So and the basic reproduction number R0 that both of them are decreasing with respect to the vaccination parameter ~bh, which indicates that appropriate vaccinating program may contribute to prevent the transmission of Dengue disease.

关键词： Dengue epidemic model basic reproduction number global stability Lyapu-nov functional class-age structure.

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Fuzzy Fractional-Order Fast Terminal Sliding Mode Control for Some Chaotic Microcomponents

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Transactions of Tianjin University 2017年第3期23卷 289-294页

作者： Jianxin Han Qichang Zhang Wei Wang jing Wang School of Mechanical Engineering Tianjin UniversityTianjin 300350China Tianjin Key Laboratory of High Speed Cutting and Precision Machining Tianjin University of Technology and EducationTianjin 300222China Tianjin Key Laboratory of Nonlinear Dynamics and Control Tianjin 300350China

In this paper, we propose a novel fractional-order fast terminal sliding mode control method, based on an integer-order scheme, to stabilize the chaotic motion of two typical microcomponents. We apply the fractional Lyapunov stability theorem to analytically guarantee the asymptotic stability of a system characterized by uncertainties and external disturbances. To reduce chattering, we design a fuzzy logic algorithm to replace the traditional signum function in the switching law. Lastly, we perform numerical simulations with both the fractional-order and integer-order control laws. Results show that the proposed control law is effective in suppressing chaos. © 2017, Tianjin University and Springer-Verlag Berlin Heidelberg.

关键词： Asymptotic stability Calculations Chaotic systems Control theory Fuzzy logic Fuzzy sets Motion control

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10Be Exposure Ages Obtained From Quaternary Glacial Landforms on the Tibetan Plateau and in the Surrounding Area

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Acta Geologica Sinica(English Edition) 2018年第2期92卷 786-800页

作者： ZHANG Mengyuan MEI jing ZHANG Zhigang WANG Jian XU Xiaobin School of Geographical Sciences Nanjing Normal University Nanjing 210023 China Key Laboratory of Virtual Geographic Environment (Nanjing Normal University) Ministry of Education Nanjing 210023 China Jiangsu Center for Collaborative Innovation in Geographical Information Resource Development and Application Nanjing 210023 China State Key Laboratory of Cryospheric Sciences Northwest Institute of Eco-Environment and Resources Chinese Academy of Sciences Lanzhou 730000 China School of Urban and Resource Environment Jiangsu Second Normal University Nanjing 210024 China

In situ terrestrial cosmogenic nuclide （TCN） exposure dating using 10Be is one of the most successful techniques used to determine the ages of Quaternary deposits and yields data that enable the reconstruction of the Quaternary glacial history of the Tibetan Plateau and the surrounding mountain ranges. Statistical analysis of TCN 10Be exposure ages, helps to reconstruct the history of glacial fluctuations and past climate changes on the Tibetan Plateau, differences in the timing of glacier advances among different regions. However, different versions of the Cosmic-Ray-prOduced NUclide Systematics on Earth （CRONUS-Earth） online calculator, which calculates and corrects the TCN ages of Quaternary glacial landforms, yield different results. For convenience in establishing contrasts among regions, in this paper, we recalculate 1848 10Be exposure ages from the Tibetan Plateau that were published from 1999 to 2017 using version 2.3 of the CRONUS-Earth calculator. We also compare the results obtained for 1594 10Be exposure ages using different versions （2.2, 2.3 and 3.0） of the CRONUS- Earth calculator. The results are as follows. （1） Approximately 97% of the exposure ages are less than 200 ka. A probability density curve of the exposure ages suggests that greater numbers of oscillations emerge during the Holocene, and the peaks correspond to the Little Ice Age, the 8.2 ka and 9.3 ka cold events; the main peak covers the period between 12 and 18 ka. （2） In most areas, the newer versions of the calculator produce older 10Be exposure ages. When different versions of the CRONUS-Earth calculator are used, approximately 29% of the 10Be exposure ages display maximum differences greater than 10 ka, and the maximum age difference for a single sample is 181.1 ka.

关键词： 10Be probability density curves in situ terrestrial cosmogenic nuclides CRONUS-Earth,Tibetan Plateau

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