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Unveiling controls of the latitudinal gradient of surface pCO_(2) in the Kuroshio Extension and its recirculation regions(northwestern North Pacific)in late spring

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Acta Oceanologica Sinica 2022年第5期41卷 110-123页

作者： Chenglong Li Weidong Zhai di qi Institute of Marine Science and Technology Shandong UniversityQingdao266237China Polar and Marine Research Institute Jimei UniversityXiamen361021China Key Laboratory of Global Change and Marine-Atmospheric Chemistry of Ministry of Natural Resources Third Institute of OceanographyMinistry of Natural ResourcesXiamen361005China

In the northwestern North Pacific,annual net air-sea CO_(2) flux is greatest in the Kuroshio Extension(KE)zone,owing to its low annual mean partial pressure of CO_(2)(pCO_(2)),and it decreases southward across the *** quantify the influences of factors controlling the latitudinal gradient in CO_(2) uptake,sea surface pCO_(2) and related parameters were investigated in late spring of 2018 in a study spanning the KE,Kuroshio Recirculation(KR),and subtropical *** found that the sea-to-air pCO_(2) difference(ΔpCO_(2))was negative and at its lowest in the KE zone.ΔpCO_(2) gradually increased southward across the KR zone,and the sea surface was nearly in air-equilibrium with atmospheric CO_(2) in the subtropical *** found that northward cooling and vertical mixing were the two major processes governing the latitudinal gradient in surface pCO_(2) and ΔpCO_(2),while biological influences were relatively *** the KE zone affected by upwelling,the vertical-mixing-induced increase in surface pCO_(2) likely canceled out approximately 61%of the decrease in surface pCO_(2) caused by cooling and biological ***,the prolonged air-sea equilibration for CO_(2) and relatively short hydraulic retention time jointly led to the low surface pCO_(2) in the KE zone in ***,the cooling KE current flows out of the region before it can be re-equilibrated with atmospheric CO_(2).

关键词： partial pressure of CO_(2) temperature effect vertical mixing biological activity air-sea exchange northwestern North Pacific

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Zonal Jet Creation from Secondary Instability of Drift Waves for Plasma Edge Turbulence

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Chinese Annals of Mathematics,Series B 2019年第6期40卷 869-890页

作者： di qi Andrew J.MAJDA Department of Mathematics and Center for Atmosphere and Ocean Science Courant Institute of Mathematical Sciences New York University

A new strategy is presented to explain the creation and persistence of zonal flows widely observed in plasma edge *** core physics in the edge regime of the magnetic-fusion tokamaks can be described qualitatively by the one-state modified Hasegawa-Mima(MHM for short)model,which creates enhanced zonal flows and more physically relevant features in comparison with the familiar Charney-Hasegawa-Mima(CHM for short)model for both plasma and geophysical *** generation mechanism of zonal jets is displayed from the secondary instability analysis via nonlinear interactions with a background base *** exponential growth in the zonal modes is induced due to a non-zonal drift wave base state in the MHM model,while stabilizing damping effect is shown with a zonal flow base *** with the selective decay effect from the dissipation,the secondary instability offers a complete characterization of the convergence process to the purely zonal *** numerical simulations with and without dissipation are carried out to confirm the instability *** shows clearly the emergence of a dominant zonal flow from pure non-zonal drift waves with small perturbation in the initial *** comparison,the CHM model does not create instability in the zonal modes and usually converges to homogeneous turbulence.

关键词： Zonal flow generation Drift wave turbulence Secondary instability Modified Hasegawa-Mima model

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Characteristics of elemental carbon and organic carbon in PM_(10) during spring and autumn in Chongqing,China

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China Particuology 2007年第4期5卷 255-260页

作者： di Ye qi Zhao Changtan Jiang Jun Chen Xiaoxing Meng Chongqing Academy of Environmental Science Chongqing 400020 China

PM10 （particulate matter with aerodynamic diameter less than 10 μm） samples were collected simultaneously at nine urban sites and one urban background site during two intensive observation campaigns in 2006. Concentrations of elemental carbon （EC） and organic carbon （OC） in PM10 were analyzed using an element analyzer. The characteristics regarding spatial and seasonal distribution patterns of OC and EC concentrations and their contributions to PM10 mass, as well as correlation between OC and EC, were investigated in detail. The average OC and EC concentrations for urban sites were 57.5 ± 20.8 and 8.3 ± 3.9 μg/m^3, respectively, both being around three times higher than those for urban background site. As a whole, EC concentrations did not show distinct seasonal variations, though OC concentrations were generally higher in autumn than in spring. For urban sites, total carbonaceous aerosol （TCA） accounted for 33.2% in spring and 35.0% in autumn of PM10 mass. The OC and EC concentrations were found significantly correlated to each other both in spring and in autumn, implying the existence of similar emission sources such as coal combustion. The OC/EC ratios generally exceeded 2.0, indicating the presence of secondary organic carbon （SOC）, whose estimated concentration for urban Chongqing was 26.7 and 39.4μg/m^3, accounting for 48.9 and 61.9% of the total OC observed in the samples, in spring and in autumn, respectively.

关键词： PM10 Elemental carbon Organic carbon Secondary organic carbon Chongqing

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Sensitivity analysis of spacecraft in micrometeoroids and orbital debris environment based on panel method

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Defence Technology（防务技术） 2023年第1期19卷 126-142页

作者： di-qi Hu Run-qiang Chi Yu-yan Liu Bao-jun Pang Hypervelocity Impact Research Center Harbin Institute of Technology150080HarbinChina

To reduce the risk of mission failure caused by the MM/OD impact of the spacecraft,it is necessary to optimize the design of the *** survivability assessment is the key technology in the optimal design of *** survivability assessment includes spacecraft impact sensitivity analysis and spacecraft component vulnerability analysis under MM/OD *** impact sensitivity refers to the probability of a spacecraft encountering an MM/OD impact while in *** refers to the probability that each component of a spacecraft may fail or malfunction when impacted by space *** this paper mainly analyzes the impact sensitivity and proposes a spacecraft sensitivity assessment method under the MM/OD environment based on a panel *** this panel method,a spacecraft geometric model is discretized into small panels,and whether they are impacted by MM/OD or not is determined through the analysis of the shielding or shadowing relationships between *** number of impacts on each panel is obtained through calculation,and accordingly the probability of each spacecraft component encountering MM/OD impact can be acquired,thus generating the impact *** paper extracts data from the NASA’s ORDEM2000,the ESA’s MASTER8 as well as the SDEEM2015(Space Debris Environmental Engineering Model developed by HIT),and uses the PCHIP(Piecewise Cubic Hermite Interpolating Polynomial)method to interpolate and fit the size-flux relationship of space *** with linear interpolation and cubic spline interpolation,the fitting results through the method are relatively more *** feasibility of this method is also demonstrated through two actual examples shown in this paper,whose results are close to those from ESABASE,although there are some minor errors mainly due to different debris data *** the cross-check by three risk assessment software-BUMPER,MDPANTO and MODAOST-under standard operating condit

关键词： Shielding algorithm Panel method Spacecraft Sensitivity

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Survivability assessment of spacecraft impacted by orbit debris

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Defence Technology（防务技术） 2021年第3期17卷 961-970页

作者： di-qi Hu Bao-jun Pang Run-qiang Chi Zhang-chi Song Hao Wu Hypervelocity Impact Research Center Harbin Institute of Technology150080HarbinChina Beijing Institute of Aerospace Automatic Control 100854BeijingChina Changchun Institute of Optics Fine Mechanics and PhysicsChinese Academy of Sciences130033ChangchunChina

To help optimize the spacecraft design and reduce the risk of spacecraft mission failure, a new approach to assess the survivability of spacecraft in orbit is presented here, including the following three steps: 1)Sensitivity Analysis of spacecraft. A new sensitivity analysis method, a ray method based on virtual outer wall, is presented here. Using rays to simulate the debris cloud can effectively address the component shadowing issues. 2) Component Vulnerability analysis of spacecraft. A function "Component functional reduction degree-Component physical damage degree" is provided here to clearly describe the component functional reduction. 3) System-level Survivability Assessment of spacecraft. A new method based on expert knowledge reasoning, instead of traditional artificial failure tree method, is presented here to greatly improve the efficiency and accuracy of calculation.

关键词： Survivability Hypervelocity impact Orbit debris Ray method

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Parity-dependent skin effects and topological properties in the multilayer nonreciprocal Su−Schrieffer−Heeger structures

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Frontiers of physics 2024年第3期19卷 115-133页

作者： Jia-Rui Li Cui Jiang Han Su di qi Lian-Lian Zhang Wei-Jiang Gong College of Sciences Northeastern UniversityShenyang 110819China Basic Department Shenyang Institute of EngineeringShenyang 110136China

We concentrate on the skin effects and topological properties in the multilayer non-Hermitian Su−Schrieffer−Heeger (SSH) structure, by taking into account the nonreciprocal couplings between the different sublattices in the unit cells. Following the detailed demonstration of the theoretical method, we find that in this system, the skin effects and topological phase transitions induced by nonreciprocal couplings display the apparent parity effect, following the increase of the layer number of this SSH structure. On the one hand, the skin effect is determined by the parity of the layer number of this SSH system, as well as the parity of the band index of the bulk states. On the other hand, for the topological edge modes, such an interesting parity effect can also be observed clearly. Next, when the parameter disorders are taken into account, the zero-energy edge modes in the odd-layer structures tend to be more robust, whereas the other edge modes are easy to be destroyed. In view of these results, it can be ascertained that the findings in this work promote to understand the influences of nonreciprocal couplings on the skin effects and topological properties in the multilayer SSH lattices.

关键词： multilayer SSH lattice nonreciprocal couplings band structure skin effect

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Study on the performance of ceramic composite projectile penetrating into ceramic composite target

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Defence Technology（防务技术） 2017年第4期13卷 295-299页

作者： Rong-cheng Yi Li-kui Yin Jian-ru Wang Zhi-gang Chen di-qi Hu National Defense Key Laboratory of Underground Damage Technology North University of China Taiyuan 030051 China

In order to study the performance of ceramic composite projectile penetrating into ceramic composite target,the contrast test and numerical simulations of the penetration of standard projectile and the ceramic composite projectile into a ceramic composite target were *** results show that the penetration performance of ceramic composite projectile is obvious superior to that of standard projectile for ceramic composite *** ceramic nose of ceramic composite projectile fully destroys the ceramic panels anterior to its following armor-piercing projectile body,thus maintaining the penetration ability of the following armor-piercing projectile body.

关键词： Ceramic Composite projectile Penetration Composite target Test

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Efficacy and safety of gemcitabine-based chemotherapies in biliary tract cancer:A meta-analysis

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World Journal of Gastroenterology 2014年第47期20卷 18001-18012页

作者： Heng Liu qi-di Zhang Zheng-Hong Li qing-qing Zhang Lun-Gen Lu Department of Gastroenterology Shanghai General HospitalShanghai Jiao Tong University School of Medicine

AIM: To investigate the efficacy and safety of gemcitabine (Gem)-based combination chemotherapies for the treatment of advanced biliary tract cancer.

关键词： Biliary tract cancer Combination chemotherapy Gemcitabine Meta-analysis Randomized trial

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Experimental study on the penetration effect of ceramics composite projectile on ceramic/A3 steel compound targets

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Defence Technology（防务技术） 2017年第4期13卷 281-287页

作者： di-qi Hu Jian-ru Wang Li-kui Yin Zhi-gang Chen Rong-cheng Yi Cheng-hua Lu National Defense Key Laboratory of Underground Damage Technology North University of China Taiyuan 030051 China Changzhou Sanyou Sissan Protective Materials MFG Co. Ltd Changzhou 213100 China

In order to improve the penetration of projectiles into ceramic composite armors,the nose of 30 mm standard projectile was replaced by a toughened ceramic nose,and the performance of ceramic-nose projectiles penetrating into ceramic/A3 steel composite targets has been experimentally *** to impact dynamics theory,,the performances of 30 mm ceramic-nose projectile and 30 mm standard projectile penetrating into the ceramic/A3 steel composite targets were analyzed and compared using DOP method,especially focusing on the effects made by different nose structures and *** aperture and depth of perforation of projectile into the armor plates as well as the residual mass of bullet core under the same conditions were comparatively analyzed.A numerical simulation was built and computed by ANSYS/*** on the simulated results,the penetration performance was further analyzed in terms of the residual mass of bullet *** results show that the ceramic nose has a great effect on the protection of bullet core.

关键词： Projectile Penetration Ceramic Impact dynamics theory Numerical simulation

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Storage and redistribution of anthropogenic CO_(2) in the western North Pacific:The role of subtropical mode water transportation

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Fundamental Research 2024年第1期4卷 103-112页

作者： Cheng-long Li Lei Han Wei-dong Zhai di qi Xu-chen Wang Hong-mei Lin Li-wen Zheng Institute of Marine Science and Technology Shandong UniversityQingdao 266237China China-ASEAN College of Marine Science and Technology Xiamen University MalaysiaSelangorMalaysia Southern Marine Science and Engineering Guangdong Laboratory(Zhuhai) Zhuhai 519080China Polar and Marine Research Institute Jimei UniversityXiamen 361021China Key Laboratory of Marine Chemistry Theory and Technology and Frontiers Science Center for Deep Ocean Multispheres and Earth SystemMinistry of EducationOcean University of ChinaQingdao 266100China Center for Isotope Geochemistry and Geochronology Pilot National Laboratory for Marine Science and Technology(Qingdao)Qingdao 266237China Weihai Institute of Marine Ecology and Economy Research Weihai 264400China

Oceanic uptake and storage of anthropogenic CO_(2)(CANT)are regulated by ocean circulation and *** decipher the storage and redistribution of CANT in the western North Pacific,where a major CANT sink develops,we investigated the water column carbonate system,dissolved inorganic radiocarbon and ancillary parameters in May and August 2018,spanning the Kuroshio Extension(KE,35-39°N),Kuroshio Recirculation(KR,27-35°N)and subtropical(21-27°N)*** column CANT inventories were estimated to be 40.5±1.1 mol m^(-2) in the KR zone and 37.2±0.9 mol m^(-2) in the subtropical *** comparison with historical data obtained in 2005,relatively high rates of increase of the CANT inventory of 1.05±0.20 and 1.03±0.12 mol m^(-2) yr^(-1) in the recent decade were obtained in the KR and subtropical zones,*** water-mass-based analyses suggest that formation and transport of subtropical mode water dominate the deep penetration,storage,and redistribution of CANT in those two *** the KE zone,however,both the water column CANT inventory and the decadal CANT accumulation rate were small and uncertain owing to the dynamic hydrology,where the naturally uplifting isopycnal surfaces make CANT penetration relatively *** findings of this study improve the understanding of the spatiotemporal variations of CANT distribution,storage,and transport in the western North Pacific.

关键词： Oceanic CO_(2)uptake Anthropogenic CO_(2)storage Subtropical mode water Kuroshio extension Kuroshio recirculation Western North Pacific

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