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Gravity anomalies determined from mean sea surface model data over the Gulf of Mexico

Acta Oceanologica Sinica 2023年第12期42卷 39-50页

作者： xuyang Wei Xin Liu Zhen Li Xiaotao Chang Hongxin Luo Chengcheng Zhu Jinyun Guo College of Geodesy and Geomatics Shandong University of Science and TechnologyQingdao 266590China Land Satellite Remote Sensing Application Center Ministry of Natural ResourcesBeijing 100048China School of Surveying and Geo-Informatics Shandong Jianzhu UniversityJinan 250101China

With the improvements in the density and quality of satellite altimetry data,a high-precision and high-resolution mean sea surface model containing abundant information regarding a marine gravity field can be calculated from long-time series multi-satellite altimeter ***,in this study,a method was proposed for determining marine gravity anomalies from a mean sea surface *** the Gulf of Mexico(15°–32°N,80°–100°W)as the study area and using a removal-recovery method,the residual gridded deflections of the vertical(DOVs)are calculated by combining the mean sea surface,mean dynamic topography,and XGM2019e_2159 geoid,and then using the inverse Vening-Meinesz method to determine the residual marine gravity anomalies from the residual gridded ***,residual gravity anomalies are added to the XGM2019e_2159 gravity anomalies to derive marine gravity anomaly *** this study,the marine gravity anomalies were estimated with mean sea surface models CNES_CLS15MSS,DTU21MSS,and SDUST2020MSS and the mean dynamic topography models CNES_CLS18MDT and *** accuracy of the marine gravity anomalies derived by the mean sea surface model was assessed based on ship-borne gravity *** results show that the difference between the gravity anomalies derived by DTU21MSS and CNES_CLS18MDT and those of the ship-borne gravity data is *** an increase in the distance from the coast,the difference between the gravity anomalies derived by mean sea surface models and ship-borne gravity data gradually *** accuracy of the difference between the gravity anomalies derived by mean sea surface models and those from ship-borne gravity data are optimal at a depth of 3–4 *** accuracy of the gravity anomalies derived by the mean sea surface model is high.

关键词： mean sea surface gravity anomaly Gulf of Mexico inverse Vening-Meinesz formula mean dynamic topography satellite altimetry

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Insight into the effect of surface carboxyl and amino groups on the adsorption of titanium dioxide for acid red G

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Frontiers of Chemical Science and Engineering 2021年第5期15卷 1147-1157页

作者： Wenlong Zhang xuyang Zhao Lin Zhang Jinwei Zhu Shanshan Li Ping Hu Jiangtao Feng Wei Yan Department of Environmental Science and Engineering Xi’an Jiaotong UniversityXi’an710049China Shaanxi Electrical Equipment Institution Xi’an710025China Shaanxi Polytechnic Institute Xianyang712000China

In this study,TiO_(2)functionalized with organic groups were prepared to study the effect of carboxyl and amino groups on the adsorption behavior of TiO_(2)for the removal of acid red G(ARG)as an anionic dye from aqueous ***_(2)was successfully modified with carboxyl and amino groups by using the hydrolysis method with oxalic acid(OAD,with two carboxyl groups),ethylenediamine(EDA,with two amino groups)and DL-alanine(DLA,with one carboxyl group and one amino group)at low temperature(65℃)and labeled as OAD-TiO_(2),EDA-TiO_(2)and DLA-TiO_(2),*** ARG uptake by the functionalized TiO_(2)samples was largely dependent on the functional *** interaction between ARG and the functional organic groups on the TiO_(2)samples plays an important role in the adsorption process,which leads to the excellent adsorption performance(higher capacity and faster adsorption rate)of the functionalized TiO_(2)samples than that of P25(commercial TiO_(2)without modification).Furthermore,there is no obvious loss of the adsorption capacity for the functionalized TiO_(2)even after 5 adsorption-desorption cycles,which indicated the good reusability of the modified TiO_(2)samples for anionic dye removal from aqueous solution.

关键词： amino group carboxylic group titanium dioxide ARG adsorption

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Effects of high temperature and high relative humidity drying on moisture distribution,starch microstructure and cooking characteristics of extruded whole buckwheat noodles

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Journal of Future Foods 2024年第2期4卷 159-166页

作者： Linghan Meng xuyang Sun Yan Zhang Xiaozhi Tang Key Laboratory of Grains and Oils Quality Control and Processing College of Food Science and EngineeringCollaborative Innovation Center for Modern Grain Circulation and SafetyNanjing University of Finance and EconomicsNanjing 210023China Hebei Key Laboratory of Food Safety Hebei Food Inspection and Research InstituteShijiazhuang 050091China

Drying is a key step in starch noodle *** effects of high temperature(60,70,80°C)and high relative humidity(65%,75%,85%)drying(HTHD)on the moisture distribution,starch microstructure and cooking characteristics of extruded whole buckwheat noodles were *** to the conventional hot-air drying(CHAD)at 40°C,the increase in drying temperature(60–80°C)and the decrease in relative humidity(85%–65%)significantly improved drying efficiency of the extruded *** adjusting drying temperature and relative humidity,the rate of moisture migration in noodles and phase transition of starch could be appropriately *** optimum drying parameters(T70H75,70°C drying temperature and 75%relative humidity)showed smooth and dense network structure,resulting in the lowest cooking loss(6.61%),broken rate(0%),highest hardness(1695.17 g)and springiness(0.92).However,the total flavonoid content(TFC)and the total phenolic content(TPC)reduced by 6.81%–28.50%and 7.19%–53.23%in contrast to CHAD,and the color of buckwheat noodles became darker through *** findings showed the potential of HTHD for increasing drying efficiency and improving buckwheat noodle *** appropriate drying parameters could maintain a balanced relationship between moisture migration in noodles and phase transition of starch,which resulted in better cooking quality for extruded whole buckwheat *** a study is valuable for regulating the process conditions of buckwheat-based foods and promoting its commercial utilization.

关键词： Extruded whole buckwheat noodle High temperature and high relative humidity drying Moisture distribution Starch microstructure Cooking characteristics

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Mechanical properties of material in a mine dump at the Shengli#1 Surface Coal Mine,China

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International Journal of Mining Science and Technology 2017年第3期27卷 545-550页

作者： Gao Shiyou Zhou Wei Shi xuyang Cai Qingxiang Crusoe Garmondyu E.Jr. Jisen Shu Huang Yuejun School of Mines China University of Mining&TechnologyXuzhou 221116China Shenhua Beidian Shengli Energy Co.Ltd. Xilinhaote 026000China

ln-situ experiments were conducted to investigate the mechanical properties of the soil-rock mixture in the internal dump of the Shengli #1 Surface Coal Mine, China. Based on the experimental results, this study used comparative analysis and found that the shear strength of the soil-rock mixture in the dump was greater than the residual shear strength of the original rock. The results showed that the material presented in the dump as large blocks was the main factor affecting the strength of the soil-rock mixture, Numerical simulation was carried out for the analyses of three factors： different combinations of shear failure, rolling failure along with different large-block radius ratios, and mixture densities. The results illustrated that the cohesion and angle of internal friction of the soil-rock mixture are 12 kPa and 32.26°. However, in some cases the bench angle in the dump was controlled by a coupling relationship of rocks in the material. Finally, the stability of a soil slope showed a linear relationship with the large-block radius ratio and the bulk density.

关键词： Surface coal mine Soil-rock mixture Residual strength In-situ experiment Mechanical model

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Reductive Amination of Carbonyl Compounds with Ammonia and Hydrogenation of Nitriles to Primary Amines with Heterogeneous Cobalt Catalysts

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Chemical Research in Chinese Universities 2019年第3期35卷 457-462页

作者： LIU Junmei GUO Wanwan SUN Hao LI Ruyue FENG Zhipeng ZHOU xuyang HUANG Jun State Key Laboratory ofMaterials-ori ented Chemical Engineering College of Chemical Engineering Nanjing Tech UniversityNanjing 210009P.R.China

Reductive amination of aldehydes/ketones with aqueous NH3 and hydrogenation of nitriles to primary amines with Co catalysts were reported. Co@NC-700 exhibited remarkable activity and high selectivity for the reductive amination of aldehydes/ketones with aqueous NH3 and the hydrogenation of nitriles to primary amines. Several primary amines can be obtained with good to excellent yields via the reductive amination of aldehydes/ketones and the hydrogenation of nitriles. The nitrogen-doped carbon(C)-supported Co@NC-700 metal catalyst was prepared via the pyrolysis of bioMOF Co/adenine in activated C. Co@NC-700 can be reused five times without evident loss of activity.

关键词： Primary amine Cobalt Reductive amination Aldehyde Hydrogenation Nitrile

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Study of plasma-based stable and ultrawideband electromagnetic wave absorption for stealth application

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Plasma Science and Technology 2018年第6期20卷 78-88页

作者： xuyang CHEN Fangfang SHEN Yanming LIU Wei AI Xiaoping LI School of Aerospace Science and Technology Xidian University Science and Technology on Space Physics Laboratory China Academy of Launch Vehicle Technology

A plasma-based stable,ultra-wideband electromagnetic（EM） wave absorber structure is studied in this paper for stealth *** stability is maintained by a multi-layer structure with several plasma layers and dielectric layers distributed *** plasma in each plasma layer is designed to be uniform,whereas it has a discrete nonuniform distribution from the overall view of the *** nonuniform distribution of the plasma is the key to obtaining ultra-wideband wave absorption.A discrete Epstein distribution model is put forward to constrain the nonuniform electron density of the plasma layers,by which the wave absorption range is extended to the ***,the scattering matrix method（SMM） is employed to analyze the electromagnetic reflection and absorption of the absorber *** the simulation,the validation of the proposed structure and model in ultra-wideband EM wave absorption is first illustrated by comparing the nonuniform plasma model with the uniform ***,the influence of various parameters on the EM wave reflection of the plasma are simulated and analyzed in detail,verifying the EM wave absorption performance of the *** proposed structure and model are expected to be superior in some realistic applications,such as supersonic aircraft.

关键词： plasma stealth ultra wideband Epstein profile scattering matrix method(SMM) electromagnetic(EM) wave absorption stable wave absorption

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Traction Potential Analysis of Self-Propelled Seafloor Trencher Based on Mechanical Measurements in Bentonite Soil

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Journal of Harbin Institute of Technology(New Series) 2017年第1期24卷 71-80页

作者： Meng Wang xuyang Wang Yuanhong Sun Zhimin Gu School of Naval Architecture Ocean and Civil EngineeringShanghai Jiaotong UniversityShanghai 200240China North China Sea Marine Technical Support Centre State Oceanic AdministrationQingdao 266061ShandongChina

Shear stress-displacement relationship model of soil is very important to predict the tractive performance of tracked vehicle. Most shear stress-displacement models were proposed for terrestrial ***,they are not suit for soft seafloor with flow surface and high water content. Based on comprehensive analysis of seafloor soil shear deformation and track segment shear tests,a new empirical model of shear stressdisplacement relationship for saturated soft-plastic soil(SSP model) was proposed. To validate the SSP model and evaluate potential tractive force of self-propelled seafloor trencher,a test platform,where track segment shear test and drawbar pull test can be performed in seafloor soil substitute(bentonite water mixture),was built. Series of shear tests were carried out. Test results show that the SSP model can describe the mechanical behavior of track segment in seafloor soil substitute with good approximation. Through analyzing the main external forces,including environmental loads from seafloor soil and sea current applied to seafloor tracked trencher during the trenching process in a straight line,drawbar pull analysis model was deduced with the SSP model. A scale test model of seafloor tracked trencher was built,and the verification tests for drawbar pull analysis model were designed and carried out. Results of verification tests indicate that the drawbar pull analysis model was feasible and effective. The drawbar pull tests also indicated that the SSP model is valid from another side.

关键词： shear stress-displacement relationship SSP model tractive performance drawbar pull self-propelled seafloor trencher

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Energy Efficiency Formation Optimization of a Fleet of AUVs Based on Multi-Island Genetic Algorithm 36

Energy Efficiency Formation Optimization of a Fleet of AUVs ...

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第36届中国控制会议

作者： Xiao Liang xuyang Mu Yuanhang Hou Linfang Su Yuan You College of Traffic Equipment and Ocean Engineering Dalian Maritime University

ISBN: (纸本)9781538629185

To address the problem of energy efficiency formation optimization for a fleet of AUVs,we research the hydrodynamic performance and formation optimization of AUVs based on integrated optimization platform using CFD numerical calculation and Multi-island Genetic Algorithm,which leads to the minimum resistance of a fleet of AUVs during long distance *** kinds of formation of a fleet of AUVs are taken into consideration and the trend of resistance of the fleet of AUVs is analyzed,including serial,parallel and mixed *** simulation results showed that energy efficiency formation were obtained by minimizing the resistance of the fleet of AUVs.

关键词： A fleet of AUVs Formation optimization Energy efficiency Multi-island Genetic Algorithm

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Viability of all-solid-state lithium metal battery coupled with oxide solid-state electrolyte and high-capacity cathode

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Journal of Energy Chemistry 2024年第4期91卷 122-131页

作者： Xingxing Jiao Xieyu Xu Yongjing Wang xuyang Wang Yaqi Chen Shizhao Xiong Weiqing Yang Zhongxiao Song Yangyang Liu Research Institute of Frontier Science Southwest Jiaotong UniversityChengdu 610031SichuanChina State Key Laboratory for Mechanical Behavior of Materials Xi'an Jiaotong UniversityXi'an 710049ShaanxiChina Department of Physics Chalmers University of TechnologyGöteborgSE 41296Sweden

Owing to the utilization of lithium metal as anode with the ultrahigh theoretical capacity density of 3860 mA h g^(-1)and oxide-based ceramic solid-state electrolytes(SE),e.g.,garnet-type Li7La_(3)Zr_(2)O_(12)(LLZO),all-state-state lithium metal batteries(ASLMBs)have been widely accepted as the promising alternatives for providing the satisfactory energy density and ***,its applications are still challenged by plenty of technical and scientific *** this contribution,the co-sintering temperature at 500℃is proved as a compromise method to fabricate the composite cathode with structural integrity and declined capacity fading of LiNi_(0.5)Co_(0.2)Mn_(0.3)O_(2)(NCM).On the other hand,it tends to form weaker grain boundary(GB)inside polycrystalline LLZO at inadequate sintering temperature for LLZO,which can induce the intergranular failure of SE during the growth of Li filament inside the unavoidable defect on the interface of ***,increasing the strength of GB,refining the grain to 0.4μm,and precluding the interfacial defect are suggested to postpone the electro-chemo-mechanical failure of SE with weak ***,the advanced sintering techniques to lower the co-sintering temperature for both NCM-LLZO composite cathode and LLZO SE can be posted out to realize the viability of state-of-the-art ASLMBs with higher energy density as well as the guaranteed safety.

关键词： All-solid-state lithium metal battery LiNi_(0.5C)o_(0.2)Mn_(0.3)O_(2)-Li7La_(3)Zr_(2)O_(12)composite cathode Co-sintering Lithium metal anode Electro-chemo-mechanical failure

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Spatio-temporal characteristics of regional sustainable economic growth drivers of China

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Regional Sustainability 2021年第3期2卷 239-255页

作者： WANG Linchuan WU Cisheng ZHAO xuyang LIU Duanyong ZHANG Tao School of Management Hefei University of TechnologyHefei230009China

Intellectual capital(IC)has become a universal performance indicator for the socioeconomic development of countries and *** on a review ofnational intellectualcapital(NIC)and regional intellectualcapital(RIC)evaluation literature,we used the regional intellectualcapitalindicator(RICI)as a model for China’s RIC evaluation to indirectly understand China’s potential economic growth ***,we collected statisticaldata of31 provinces(including municipalities and autonomous regions)in China from 2004 to 2016to measure RICI and analyze its dynamic characteristics from temporal and spatial *** this paper,Delphi analysis was used to construct RICI model,and cluster analysisand exploratory spatial data analysis were used to analyze the temporal and spatial characteristics of RICI in *** results showedthat RICI,which represents China’s overall economic growth drivers,increases annuallyand is consistent with economic developmentlevelduring the study *** the geo-spatial space,RICI follows the trend of“high in the east and low in the west”,gradually decreasing from eastern to western *** structure,the shape of the radar chart of IC structure located in the eastern coastal areas is usually biased towards strong external relational capital,while that in western China is generally biased towards structural *** spatial correlation,China’s RICI has dependence on geographical adjacent space and economic *** research can provide policy suggestions for the sustainable development of regional economy from an IC perspective.

关键词： Regional intellectual capital Intellectual capital structure Spatial correlation Moran’s I Economic growth drivers Sustainable economic growth

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