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Accumulation of mercury in rice grain and cabbage grown on representative Chinese soils

Journal of Zhejiang University-Science B(Biomedicine & Biotechnology) 2013年第12期14卷 1144-1151页

作者： Chun-fa LIU Cheng-xian WU Muhammad T.RAFIQ Rukhsanda AZIZ dan-di hou Zhe-li diNG Zi-wen LIN Lin-jun LOU Yuan-yuan FENG Ting-qiang LI Xiao-e YANG Ministry of Education Key Laboratory of Environmental Remediation and Ecological Health College of Environmental and Resource Sciences Zhejiang University

A pot culture experiment was carried out to investigate the accumulation properties of mercury(Hg) in rice grain and cabbage grown in seven soil types(Udic Ferrisols, Mollisol, Periudic Argosols, Latosol, Ustic Cambosols, Calcaric Regosols, and Stagnic Anthrosols) spiked with different concentrations of Hg(CK, 0.25, 0.50, 1.00, 2.00, and 4.00 mg/kg). The results of this study showed that Hg accumulation of plants was significantly affected by soil types. Hg concentration in both rice grain and cabbage increased with soil Hg concentrations, but this increase differed among the seven soils. The stepwise multiple regression analysis showed that pH, Mn(II), particle size distribution, and cation exchange capacity have a close relationship with Hg accumulation in plants, which suggested that physicochemical characteristics of soils can affect the Hg accumulation in rice grain and cabbage. Critical Hg concentrations in seven soils were identified for rice grain and cabbage based on the maximum safe level for daily intake of Hg, dietary habits of the population, and Hg accumulation in plants grown in different soil types. Soil Hg limits for rice grain in Udic Ferrisols, Mollisol, Periudic Argosols, Latosol, Ustic Cambosols, Calcaric Regosols, and Stagnic Anthrosols were 1.10, 2.00, 2.60, 2.78, 1.53, 0.63, and 2.17 mg/kg, respectively, and critical soil Hg levels for cabbage are 0.27, 1.35, 1.80, 1.70, 0.69, 1.68, and 2.60 mg/kg, respectively.

关键词： Mercury accumulation Soil safety Soil types Rice grain Cabbage Intake

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A late Carboniferous transition from subduction to collision:Tectonosedimentary evidence from southern Junggar,NW China

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Geoscience Frontiers 2024年第3期15卷 166-179页

作者： Shuoqin hou di Li Dengfa He Yu Lu Yu Zhen Hao Yang dan Fan Key Laboratory of Marine Reservoir Evolution and Hydrocarbon Accumulation Mechanism the Ministry of Educationand School of Energy ResourcesChina University of Geosciences(Beijing)Beijing 100083China

The Carboniferous to Permian tectono-sedimentary evolution of the southern Junggar area brings new insights into understanding the subduction-collision processes in the northern Tianshan *** geophysics,geochemistry,and geochronology approaches,this study investigates the Carboniferous-Permian strata in the southern Junggar *** results have revealed three distinct tectono-stratigraphic evolutionary stages,each marked by a distinctive volcano-sedimentary *** Early Carboniferous strata suggest intense volcanic activities in the southern Junggar *** the Late Carboniferous,the southern Junggar Basin was controlled by normal faulting in an extensional setting,receiving sedimentary inputs from the Junggar *** Lower Permian,unconformably overlying the Upper Carboniferous,was shaped by an extensional regime and is comprised by volcano-clastic sequences that received detritus from the Yili-Central Tianshan *** findings indicate that a Late Carboniferous forearc basin developed in the southern Junggar area,and it evolved into a post-collisional rift in the Early *** period marked a dynamic shift from bidirectional subduction(rollback)to the detachment of the North Tianshan oceanic *** propose that the collision between the YiliCentral Tianshan block and the Junggar terrane,along with the closure of the North Tianshan Ocean,likely occurred in the Late Carboniferous(ca.306-303 Ma).

关键词： Tectono-sedimentary evolution Tectonic transition Carboniferous-Permian Junggar Basin North Tianshan Ocean

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HOMOGENIZATION OF INCOMPRESSIBLE EULER EQUATIONS

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Journal of Computational Mathematics 2004年第2期22卷 220-229页

作者： ThomasY.hou dan-pingYang KeWang ppliedandComput.Mathematics CaltechPasadenaCA91125USA SchoolofMathematicsandSystemScience ShandongUniversityJinan250100China AppliedandComput.Mathematics CaltechPasadenaCA91125USA

In this paper, we perform a nonlinear multiscale analysis for incompressible Euler equations with rapidly oscillating initial data. The initial condition for velocity field is assumed to have two scales. The fast scale velocity component is periodic and is of order *** of the important questions is how the two-scale velocity structure propagates in time and whether nonlinear interaction will generate more scales dynamically. By using a Lagrangian framework to describe the propagation of small scale solution, we show that the two-scale structure is preserved dynamically. Moreover, we derive a well-posed homogenized equation for the incompressible Euler equations. Preliminary numerical experiments are presented to demonstrate that the homogenized equation captures the correct averaged solution of the incompressible Euler equation.

关键词： Homogenization Incompressible flow Multiscale analysis Multiscale computation

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Corrosion and chemical behavior of Mg_(97)Zn_(1)Y_(2)-1wt.%SiC under different corrosion solutions

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China Foundry 2021年第1期18卷 68-74页

作者： di-qing Wan Yan-dan Xue Jia-jun Hu hou-bin Wang Wei Liu School of Materials Science and Engineering East China Jiaotong UniversityNanchang330013China

To explore the corrosion properties of magnesium alloys, the chemical behavior of a high strength Mg_(97)Zn_(1)Y_(2)-1 wt.%Si C alloy in different corrosion environments was studied. Three solutions of 0.2 mol·L^(-1) NaCl, Na_(2)SO_(4) and NaNO_(3) were selected as corrosion solutions. The microstructures, corrosion rate, corrosion potential, and mechanism were investigated qualitatively and quantitatively by optical microscopy(OM), scanning electron microscopy(SEM), immersion testing experiment, and electrochemical test. Microstructure observation shows that the Mg_(97) Zn_(1)Y_(2)-1 wt.%Si C alloy is composed of α-Mg matrix, LPSO(Mg_(12) ZnY) phase and Si C phase. The hydrogen evolution and electrochemical test results reflect that the Mg_(97)Zn_(1)Y_(2)-1 wt.%SiC in 0.2 mol·L^(-1) Na Cl solution has the fastest corrosion rate, followed by Na_(2)SO_(4) and NaNO_(3) solutions, and that the charge-transfer resistance presents the contrary trend and decreases in turn.

关键词： Mg_(97)Zn_(1)Y_(2)-1wt.%Si C corrosion rate corrosion morphology corrosion mechanism

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Multi-functional Hollow Structures for Intelligent Drug Delivery

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Chemical Research in Chinese Universities 2024年第3期40卷 394-412页

作者： hou Ping YANG Nailiang WANG dan State Key Laboratory of Biochemical Engineering Institute of Process EngineeringChinese Academy of SciencesBeijing 100190P.R.China School of Chemical Engineering University of Chinese Academy of SciencesBeijing 100049P.R.China Key Laboratory of Biopharmaceutical Preparation and Delivery Chinese Academy of SciencesBeijing 100049P.R.China

Multi-fountional hollow structures have emerged as promising platforms for intelligent drug delivery due to their unique properties,such as high loading capacities and programmed drug *** particular,hollow multishell structures(HoMSs)with multilevel shell and space can regulate the molecular-level interaction between drugs and materials,so as to achieve the temporal-spatial order and sequential release of *** anisotropic hollow structures can control the drug diffusion process by inducing the macroscopic interface flow through autonomous movement,realizing the targeted drug transport and *** this paper,a key focus will be HoMSs with their temporal-ordered architectures and anisotropic hollow carriers with directional *** synthesis mechanisms,structure-property relationships,smartly programmed drug delivery and biomedical applications will be discussed,providing insights into designing next-generation intelligent drug carriers.

关键词： Hollow multishell structure Anisotropic hollow structure Intelligent drug carrier Temporal-spatial order directional movement

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On the Weak Solutions to Steady-State Mixed Navier–Stokes/Darcy Model

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Acta Mathematica Sinica,English Series 2023年第5期39卷 939-951页

作者： Yan Ren hou dan dan XUE Yao Lin JIANG School of Mathematics and Statistics Xi'an Jiaotong UniversityXi'an 710049P.R.China College of Mathematics and System Science Xinjiang UniversityWulumuqi 830046P.R.China College of Mathematics and Physics Chengdu University of TechnologyChengdu 610059P.R.China

In this paper,for the mixed Navier–Stokes/Darcy model with Beavers–Joseph–Saffman’s interface condition,we first establish an a priori estimate for possible weak solutions by means of expanding the coupled *** we prove the existence of weak solutions without the small data and/or large viscosity restriction,which is required for the existence of the weak solutions in *** a direct corollary,we also get the global uniqueness of the weak solution.

关键词： Porous media fow Navier-Stokes equations weak solution a priori estimate existence and global uniqueness

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Experimental study on expansion and cracking properties of static cracking agents in different assembly states

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International Journal of Mining Science and Technology 2022年第6期32卷 1259-1272页

作者： Chong Li Sifeng He Wentao hou dan Ma School of Mines China University of Mining and TechnologyXuzhou 221116JiangsuChina MOE Key Laboratory of Deep Coal Resource Mining China University of Mining and TechnologyXuzhou 221116JiangsuChina

Rolled static cracking agent(RSCA)can solve the intractable problem of traditional bulk static cracking agent(BSCA)in engineering *** paper innovatively studies the rational water-cement ratio of BSCA and the immersion soaking time of RSCA under the condition of controlling *** the expansion and cracking performance experiments,the development characteristics of expansion pressure,the cracking effect of the single-hole specimen and the performance of hole spraying prevention under the action of BSCA and RSCA were compared and *** results show that:(1)The volume growth rate of static cracking agent decreases with the increase of water-cement ratio,and the fluidity increases with the increase of water-cement *** rational water-cement ratio for BSCA application is 0.3,and the rational immersion time of RSCA is 2-2.5 min;(2)Under the bore diameters of 30,35,40 and 45 mm,the expansion pressure of BSCA with a water-cement ratio of 0.3 is 38.2,52.3,61.5 and 68 MPa,and the expansion pressure of RSCA immersed in water for 2.5 min is 43.5,58.8,69.5 and 75.1 MPa,*** them,the development speed of expansion pressure of BSCA is higher than that of RSCA,and the arrival time of the peak expansion pressure of RSCA is 1.7 times that of BSCA;(3)The crack initiation speed of single-hole specimen under the action of RSCA is 10.3%lower than that under the action of BSCA,but the cracking speed of the former is 72.6%higher than that of the latter;(4)The hole spraying occurs in BSCA under the bore diameter of 50,55 and 60 mm,while the hole spraying occurs in RSCA under the bore diameter of 60 *** terms of bore diameter,the hole spraying prevention of the RSCA is better than that of *** research results enrich the static blasting technology and provide data support and theoretical reference for field application.

关键词： Static cracking agent Water-cement ratio Static blasting Expansion pressure Hole spraying

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K3PO4-Promoted Cyclopropanation of Electron-deficient Alkenes with 2-Bromo-1,3-Propanedione Compounds

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Chemical Research in Chinese Universities 2019年第6期35卷 1002-1007页

作者： CHEN Zhanguo WEN Ting hou dan Key Laboratory for Macromolecular Science of Shaanxi Province School of Chemistry and Chemical EngineeringShaanxi Normal UniversityXi'an 710119P.R.China

An easy and efficient method for the synthesis of multisubstituted cyclopropane derivatives from electron-deficicent alkenes with 2-bromo-1,3-propanedione compounds was *** this method,ethylα-cyanocinnamate derivatives 1 andβ,β-dicyanostyrene derivatives 4 can all smoothly reacted with 2-bromo-1,3-propanedione compounds 2 to afford the corresponding multisubstituted cyclopropane derivatives 3 and 5 in good to excellent yields(up to 100%)promoted by anhydrous K3PO4 in DMF at room temperature,respectively.A possible mechanism of this reaction was *** of all the products were confirmed by ^1H NMR,^13C NMR and HRMS.

关键词： Cyclopropanation Multisubstituted cyclopropane derivative Electron-deficicent alkene 2-Bromo-l,3-propanedione compound

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Cross-stacking crystal structural configuration of integrated cathode materials for proton-conducting solid oxide fuel cells

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Rare Metals 2024年第11期43卷 6088-6095页

作者： Jun-Yi Gong dan-dan Yang Wei Liu Jie hou School of Resource Environment and Safety Engineering University of South ChinaHengyang 421001China CAS Key Laboratory of Materials for Energy Conversion and Collaborative Innovation Center of Suzhou Nano Science and Technology University of Science and Technology of ChinaHefei 230026China

The absence of cathode materials with excellent activity and stability has hampered the widespread application of proton-conducting solid oxide fuel cells(H-SOFCs).Sm_(2)Ba_(1.33)Ce_(0.67)Cu_(3)O_(9)(SBCC)is a layered material formed by the cross-stacking of a[CuO_(5)layer][CeO_(2)-like layer][CuO_(5)layer][Sm_(x)Ba_(1-x)CuO_(y)perovskite layer].This complex structure could potentially enhance electrocatalytic performance owing to the integration of differentstructural,chemical and electronic properties.

关键词： structural stacking solid

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Odorant receptor orthologues from moths display conserved responses to cis-jasmone

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Insect Science 2024年第4期31卷 1107-1120页

作者： Xiao-Qing hou Zhongqiang Jia dan-dan Zhang Guirong Wang Shenzhen Branch Guangdong Laboratory for Lingnan Modern AgricultureSynthetic Biology Laboratory of the Ministry of Agriculture and Rural AffairsAgricultural Genomics Institute at ShenzhenChinese Academy of Agricultural SciencesShenzhenGuangdong ProvinceChina State Key Laboratory for Biology of Plant diseases and Insect Pests Institute of Plant ProtectionChinese Academy of Agricultural SciencesBeijingChina Department of Biology Lund UniversityLundSweden

In insects,the odorant receptor(OR)multigene family evolves by the birth-and-death evolutionary model,according to which the OR repertoire of each species has undergone specific gene gains and losses depending on their chemical environment,resulting in taxon-specific OR lineage radiations with different sizes in the phylogenetic *** the general divergence in the gene family across different insect orders,the ORs in moths seem to be genetically conserved across species,clustered into 23 major clades containing multiple orthologous groups with single-copy gene from each *** hypothesized that ORs in these orthologous groups are tuned to ecologically important compounds and functionally ***-Jasmone is one of the compounds that not only primes the plant defense of neighboring receiver plants,but also functions as a behavior regulator to various *** test our hypothesis,using Xenopus oocyte recordings,we functionally assayed the orthologues of BmorOR56,which has been characterized as a specific receptor for *** results showed highly conserved response specificity of the BmorOR56 orthologues,with all receptors within this group exclusively responding to *** is supported by the dN/dS analysis,showing that strong purifying selection is acting on this ***,molecular docking showed that the ligand binding pockets of BmorOR56 orthologues to cis-jasmone are *** together,our results suggest the high conservation of OR for ecologically important compounds across Heterocera.

关键词： cis-jasmone evolutionary conservation functional characterization molec-ular docking moths purifying selection

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