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Flocculation properties of cohesive fine-grained sediment in the Three Gorges Reservoir under variable turbulent shear

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Journal of Mountain Science 2022年第8期19卷 2286-2296页

作者： LIU jie SHEN ying WANG Xin National Inland Waterway Regulation Engineering Research Center Chongqing Jiaotong UniversityChongqing 400074China Tianjin Research Institute for Water Transport Engineering Tianjin 300000China National Key Laboratory of Hydraulic Engineering Simulation and Safety Tianjin UniversityTianjin 300072China

Sediment flocculation is a key process for the deposition of fine-grained sediments in the Three Gorges Reservoir(TGR)of *** flocculation influences the evolution of the river regime,but also hampers the smooth navigation in the long ***,the flocculation process and its controlling factors are poorly *** experimentally determined the flocculation properties of cohesive sediment of samples from the TGR(predominantly a mixture of clay and silt)over a range of turbulent shear rates and sediment *** experiments were conducted in an almost isotropic turbulence field,which was simulated by an array of horizontal oscillating grids in a water *** flocculation was recorded by a camera and investigated by image *** new data indicate that flocculation is generally a response in equilibrium median floc size(d_(f,50))to the increase of the shear rate *** peak value is attained at G=16.5 s^(-1),where d_(f,50) is 81.3μm(for the suspended sediment concentration(ssc)=0.4 g/L)and 107μm(for ssc=0.7 g/L),*** low shear rates(G<16.5 s^(-1)),the equilibrium floc sizes d_(f,50) increase with rising shear rate G and isinversely related to the Kolmogorov micro length scale η.We attribute this variability to an insufficient deposition time of the sediment flocs in the water *** velocities,calculated from our experimental data of the floc sizes,are almost consistent with in-situ measured settling velocities,and are ten times larger than the terminal settling velocity of primary particles as calculated from Stokes'law.

关键词： Cohesive sediment flocculation Floc properties Settling velocity Turbulent shear rate Three Gorges Reservoir(TGR)

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Tungsten control in type-I ELMy H-mode plasmas on EAST

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Nuclear Science and Techniques 2021年第9期32卷 61-72页

作者： Zong xu Zhen-Wei Wu Ling Zhang Yun-Xing Cheng Wei Gao Xiao-Dong Lin Xiang Gao ying-jie Chen Yue-Heng Huang Juan Huang Qing Zang Yin-Xian jie Yan-Min Duan ying-ying Li Hai-Qing Liu Guo-Sheng xu EAST team Advanced Energy Research Center Shenzhen UniversityShenzhen 518060China Key Laboratory of Optoelectronic Devices and Systems of Ministry of Education and Guangdong Province College of Optoelectronic EngineeringShenzhen UniversityShenzhen 518060China Institute of Plasma Physics Chinese Academy of ScienceHefei 230031China University of Science&Technology of China Hefei 230031China

The first experimental investigation of the tungsten behavior in ELMy H-mode plasmas with co-/counter neutral beam injection(NBI)and unfavor-able/favorable B t was performed on *** was found to accumulate easily in ELMy H-mode plasma with co-NBI heating and unfavorable B ***,in this case the tungsten concentration can exceed 10^(-4),resulting in degradation of the plasma confinement and periodic H–L *** reduce the tungsten concentration in steady-state type-I ELMy H-mode operation,counter-NBI is applied to modify the density and temperature and brake the plasma toroidal *** applied counter-NBI decreases the PHZ+E_(r) inward pinch velocity and rever-ses the direction of neoclassical inward convection,thus decreasing the tungsten concentration from-7×10^(-5) to-2×10^(-5) in type-I ELMy H-mode plasma with favorable B_(t).A comparison of the effects of different B_(t) directions on the tungsten behavior also shows that favor-able B_(t) is beneficial for reducing the tungsten concentration in the core *** results imply that counter-NBI with favorable B_(t) can effectively prevent tungsten accu-mulation and expand the operating window for exploring steady-state type-I ELMy H-mode operation of EAST.

关键词： Tungsten accumulation Counter-NBI Favorable B_(t)ELMy H-mode EAST

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The Climate Response to Global Forest Area Changes under Different Warming Scenarios in China

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Advances in Atmospheric Sciences 2023年第6期40卷 1073-1088页

作者： ying HUANG Anning HUANG jie TAN School of Atmospheric Sciences Nanjing UniversityNanjing 210023China Frontiers Science Center for Critical Earth Material Cycling Nanjing UniversityNanjing 210023China Glarun Technology Co. Ltd.Nanjing 211106China

Human activities have notably affected the Earth’s climate through greenhouse gases(GHG), aerosol, and land use/land cover change(LULCC). To investigate the impact of forest changes on regional climate under different shared socioeconomic pathways(SSPs), changes in surface air temperature and precipitation over China under low and medium/high radiative forcing scenarios from 2021 to 2099 are analyzed using multimodel climate simulations from the Coupled Model Intercomparison Project Phase 6(CMIP6). Results show that the climate responses to forest changes are more significant under the low radiative forcing scenario. Deforestation would increase the mean, interannual variability, and the trend of surface air temperature under the low radiative forcing scenario, but it would decrease those indices under the medium/high radiative forcing scenario. The changes in temperature show significant spatial heterogeneity. For precipitation, under the low radiative forcing scenario, deforestation would lead to a significant increase in northern China and a significant decrease in southern China, and the effects are persistent in the near term(2021–40), middle term(2041–70), and long term(2071–99). In contrast, under the medium/high radiative forcing scenario, precipitation increases in the near term and long term over most parts of China, but it decreases in the middle term, especially in southern, northern,and northeast China. The magnitude of precipitation response to deforestation remains comparatively small.

关键词： land use/land cover change deforestation radiative forcing scenario regional climate

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SECOND-ORDER NONLINEAR OPTICAL HYPERBRANCHED POLYMER CONTAINING ISOLATION CHROMOPHORE MOIETIES DERIVED FROM BOTH “H”-TYPE AND STAR-TYPE CHROMOPHORES

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Chinese Journal of Polymer Science 2013年第10期31卷 1415-1423页

作者： Wen-bo Wu ying-jie Fu Can Wang Zhen xu Cheng Ye Jin-gui Qin Zhen Li Department of Chemistry Hubei Key Lab on Organic and Polymeric Opto-Electronic MaterialsWuhan University Key Laboratory of Organic Solids Institute of Chemistry Chinese Academy of Sciences

An NLO hyperbranched polymer （HP1） derived from both ＂H＂-type and star-type chromophores was synthesized successfully for the first time with high yield via one-pot ＂A2 ＋ B3＂ Suzuki polymerization reaction. Isolation chromophore was also introduced to further improve its performance. Although under the test conditions, the films of HP1 could not be poled completely, it still demonstrated satisfactory macroscopic NLO effect with the second harmonic generation （SHG） coefficient d33 value of 36 pm/V.

关键词： Hyperbranched polymer NLO Isolation chromophore "H"-type chromophore Star-type chromophore.

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Exploration of the regulatory effect of miR-21 on breast cancer cell line proliferation and invasion as well as the downstream target genes

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Asian Pacific Journal of Tropical Medicine 2016年第5期9卷 456-459页

作者： ying Kuang ying-jie Nie Central Lab Guizhou Provincial People's Hospital

Objective: To study the regulatory effects of miR-21 on breast cancer cell line proliferation and invasion as well as the downstream target genes. Methods: Breast cancer cell lines MCF-7 were cultured and transfected with miR-21 mimics and the corresponding negative control mimics(NC mimics), and then MTS kits were used to detect cell viability. Transwell experiment was used to detect cell invasion ability, and fluorescence quantitative PCR was used to detect the expression of proliferation and invasion-related genes in cells. Results: 24 h after transfection of miR-21 mimics and NC mimics, cell OD value and the number of invasive cells of miR-21 group were significantly higher than those of NC group, and m RNA contents of PDCD-4, Fas L, PTEN, Rho B, Maspin, TIMP3 and RECK in cells were significantly lower than those of NC group. Conclusion: miR-21 can promote the proliferation and invasion of breast cancer cell lines, and its downstream target genes include PDCD-4, Fas L, PTEN, Rho B, Maspin, TIMP3 and RECK.

关键词： Breast cancer Micro RNA Proliferation Invasion

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Clinicopathological characteristics and prognosis of 77 cases with type 3 gastric neuroendocrine tumours

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World Journal of Gastrointestinal Oncology 2020年第12期12卷 1416-1427页

作者： Yuan-Liang Li xu-Dong Qiu jie Chen Yu Zhang jie Li Jian-Ming xu Chao Wang Zhi-Rong Qi jie Luo Huang-ying Tan Beijing University of Chinese Medicine Beijing 100029China Department of Integrative Oncology China-Japan Friendship HospitalBeijing 100029China Department of Gastroenterology The First Affiliated Hospital of Sun Yat-sen UniversityGuangzhou 510000Guangdong ProvinceChina Department of Gastrointestinal Oncology Peking University Cancer Hospital and Beijing Cancer HospitalBeijing 100037China Department of Gastrointestinal Oncology The Fifth Medical CenterChinese PLA General HospitalBeijing 100071China Department of Pathology China-Japan Friendship HospitalBeijing 100029China

BACKGROUND For the rarity of type 3 gastric neuroendocrine tumours(g-NETs),their clinicopathological characteristics and prognosis are not well *** To describe the clinicopathological features and outcome of type 3 g-NETs in the Chinese *** Based on the 2019 WHO pathological classification,the clinicopathological characteristics and prognosis of patients with type 3 g-NETs in China were retrospectively *** A total of 77 patients(55.8%of females)with type 3 g-NETs were analysed,with a median age of 48 years(range:28-79 years).The tumours were mainly located in the gastric fundus/body(83.1%)and were mostly solitary(83.1%),with a median size of 1.5 cm(0.8-3.5 cm).Of these,there were 37 G1 tumours(48.1%),31 G2(40.3%),and 9 G3(11.7%).Ten(13.0%)and 24(31.2%)patients had lymph node and distant metastasis,*** addition,type 3 g-NETs were *** with G1 NETs,G2 NETs had a higher lymph node metastasis rate,and G3 NETs had a higher distant metastasis rate.G1 and G2 NETs with stage I/II disease(33/68)received endoscopic treatment,and no tumour recurrence or tumour-related death was observed within a median follow-up time of 36 *** and distant metastasis were identified to be independent risk factors for prognosis in multivariable *** Type 3 g-NETs are obviously heterogeneous,and the updated WHO 2019 pathological classification may be used to effectively evaluate their biological behaviors and ***,endoscopic treatment should be considered for small(<2 cm),low grade,superficial tumours.

关键词： Type 3 gastric neuroendocrine tumours Clinicopathological characteristics Endoscopic treatment Prognosis Chinese population

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Change in Extreme Climate Events over China Based on CMIP5

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Atmospheric and Oceanic Science Letters 2015年第4期8卷 185-192页

作者： xu ying WU jie SHI ying ZHOU Bo-Tao LI Rou-Ke WU Jia National Climate Center China Meteorological Administration Chinese Academy of Meteorological Sciences China Meteorological Administration

The changes in a selection of extreme climate indices(maximum of daily maximum temperature(TXx),minimum of daily minimum temperature(TNn),annual total precipitation when the daily precipitation exceeds the 95th percentile of wet-day precipitation(very wet days,R95p),and the maximum number of consecutive days with less than 1 mm of precipitation(consecutive dry days,CDD))were projected using multi-model results from phase 5 of the Coupled Model Intercomparison Project in the early,middle,and latter parts of the 21st century under different Representative Concentration Pathway(RCP)emissions *** results suggest that TXx and TNn will increase in the future and,moreover,the increases of TNn under all RCPs are larger than those of TXx.R95p is projected to increase and CDD to decrease *** changes in TXx,TNn,R95p,and CDD in eight sub-regions of China are different in the three periods of the 21st century,and the ranges of change for the four indices under the higher emissions scenario are projected to be larger than those under the lower emissions *** multi-model simulations show remarkable consistency in their projection of the extreme temperature indices,but poor consistency with respect to the extreme precipitation *** substantial inconsistency is found in those regions where high and low temperatures are likely to happen for TXx and TNn,*** extreme precipitation events(R95p),greater uncertainty appears in most of the southern regions,while for drought events(CDD)it appears in the basins of *** uncertainty in the future changes of the extreme climate indices increases with the increasing severity of the emissions scenario.

关键词： CMIP5 extreme climate index climate projection uncertainty

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Substantial thermoelectric enhancement achieved by manipulating the band structure and dislocations in Ag and La co-doped SnTe

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Journal of Advanced Ceramics 2021年第4期10卷 860-870页

作者： Wenjing xu Zhongwei ZHANG Chengyan LIU jie GAO Zhenyuan YE Chunguang CHEN ying PENG Xiaobo BAI Lei MIAO Guangxi Key Laboratory of Information Material Guangxi Collaborative Innovation Center of Structure and Property for New Energy and MaterialsSchool of Material Science and EngineeringGuilin University of Electronic TechnologyGuilin 541004China Department of Materials Science and Engineering SIT Research LaboratoriesInnovative Global ProgramFaculty of EngineeringShibaura Institute of TechnologyTokyo 135-8548Japan

Eco-friendly SnTe based thermoelectric materials are intensively studied recently as candidates to replace PbTe;yet the thermoelectric performance of SnTe is suppressed by its intrinsically high carrier concentration and high thermal *** this work,we confirm that the Ag and La co-doping can be applied to simultaneously enhance the power factor and reduce the thermal conductivity,contributing to a final promotion of figure of *** one hand,the carrier concentration and band offset between valence bands are concurrently reduced,promoting the power factor to a highest value of-2436μW·m^(-1)·K^(-2) at 873 *** the other hand,lots of dislocations(~3.16×10^(7)mm^(-2))associated with impurity precipitates are generated,resulting in the decline of thermal conductivity to a minimum value of 1.87 W·m^(-1)·K^(-1) at 873 *** a result,a substantial thermoelectric performance enhancement up to zT≈1.0 at 873 K is obtained for the sample Sn0.94Ag0.09La0.05Te,which is twice that of the pristine SnTe(zT≈0.49 at 873 K).This strategy of synergistic manipulation of electronic band and microstructures via introducing rare earth elements could be applied to other systems to improve thermoelectric performance.

关键词： SnTe band convergence dislocation Ag and La co-doping thermoelectric performance

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CONVERGENCE OF AN EXPLICIT UPWIND FINITE ELEMENT METHOD TO MULTI-DIMENSIONAL CONSERVATION LAWS

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Journal of Computational Mathematics 2001年第1期19卷 87-100页

作者： Jin-chao xu Lung-an ying Center for Computational Mathematics and Applications and Department of Mathematics Pennsylvania State UniversityU.S.A School of Mathematical Sciences Peking UniversityBeijing 100871China

Investigates the convergence of an explicit upwind finite element method, the edge-averaged finite element method to multidimensional scalar conservation laws. Discussion on the finite element scheme and main converge... 详细信息

关键词： conservation law finite element method convergence

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Unconditionally Stable Pressure-Correction Schemes for a Nonlinear Fluid-Structure Interaction Model

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Communications on Applied Mathematics and Computation 2019年第1期1卷 61-80页

作者： ying He jie Shen Department of Mathematics Purdue UniversityWest LafayetteIN 47907USA

We consider in this paper numerical approximation of a nonlinear fluid-structure interac丒 tion(FSI)model with a fixed *** construct a new class of pressure-correction schemes for the FSI problem,and prove rigorously that they are unconditionally *** schemes are computationally very efficient,as they lead to,at each time step,a coupled linear elliptic system for the velocity and displacement in the whole region and a discrete Poisson equation in the fluid region.

关键词： Fluid-structure interaction Pressure correction Stability analysis

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