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Toxicity of Fluoranthene and Its Biodegradation by Cyclotella caspia Alga

Journal of Integrative Plant Biology 2006年第2期48卷 169-180页

作者： yu Liu Tian-Gang Luan Ning-Ning Lu chong-yu Lan School of Life Sciences State Key Laboratory for Biocontrol Sun Yet-sen （Zhongshan） University Guangzhou 510275 China School of Environmental Sciences and Engineering Sun Yet-sen （Zhongshan） University Guangzhou 510275 China

Fluoranthene Is one of the polynuclear aromatic hydrocarbons with four benzene rings. Because of Its toxicity, mutagenlclty, and carclnogenlclty, fluoranthene Is on the black lists of 129 and 68 priority pollutants established by US Environmental Protection Agency and the People＇s Republic of China, respectively. In recent years, the amount of fluoranthene In the aquatic environment has been Increasing with Increases In anthropogenlc discharge. Based on the biological investigation of tidal water In the Futlan mangrove, Cycioteila ~aspla was selected as the dominant algal species to determine the toxicity of fluoranthene towards C. caspla alga and to Investigate the blodegradatlon of fluoranthene by C. caspla under pure culture. The toxicity experiment showed that the 96-h EC50 value for fluoranthene was 0.2 mg/mL. Four parameters, namely C. caspla algal growth rate, chlorophyll （Chl） a content, cell morphology, and superoxlde dlsmutase （SOD） activity, were chosen as Indices of toxicity and were measured at 6 d （144 h）. The results showed that：（Ⅰ） the toxicity of fluoranthene towards C. caspla alga was obvious; （Ⅱ） C. caspla algal growth rate and Chl a content decreased with Increasing concentrations of fluoranthene; and （Ⅲ） the rate of cell deformation and SOD activity Increased with Increasing concentrations of fluoranthene. The blodegradatlon experiment showed that：（Ⅰ） the rate of physical degradation of fluoranthene was only 5.86%; （Ⅱ） the rate of blodegradatlon of fluoranthene on the 1st and 6th days （l.e. at 24 and 144 h） was approximately 35% and 85%, respectively; and （Ⅲ） the blodegradatlon capability of C. caspla alga towards fluoranthene was high. It is suggested that further Investigations on the toxicity of fluoranthene towards algae, as well as on algal blodegradatlon mechanisms, are of great Importance to use C. caspla as a biological treatment species In an organic wastewater treatment system.

关键词： biodegradation Cyclotella caspia fluoranthene toxicity.

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A numerical model with Stokes drift for pollutant transport within the surf zone on a plane beach

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Acta Oceanologica Sinica 2019年第9期38卷 102-112页

作者： Chunping Ren Rongrong Liang chong yu yuchuan Bai College of Water Resource Science and Engineering Taiyuan University of Technology Taiyuan 030024 China State Key Laboratory of Hydraulic Engineering Simulation and Safety Tianjin University Tianjin 300072 China

This study examines the effects of Stokes drift on pollutant transport within the surf zone on a plane beach both numerically and experimentally. Firstly, the numerical model is described. The wave-induced current is modeled using the concept of the radiation stress. The wave propagation model is based on the wave energy conservation equation. And the advective diffusion model including the Stokes drift is used to describe the pollutant transport in the surf zone. Model validation was achieved in this case versus an analytical solution for an instantaneous point source in a uniform horizontal flow. This study also describes a laboratory experiment on dye release in the surf zone over a plane beach. We examined the final inclination angle required by a continuously released pollutant plume to reach the shoreline under both cases, and transport velocities in the alongshore and cross- shore directions were estimated by linearly fitting the location of a dye-patch front at different time. Results show that this dye patch moved shoreward with an approximate speed of 0.05 m/s (0.017 m/s) between 10 s and 40 s and 0.001 m/s (0.011 m/s) after 40 s for Case 1 (2). This model was then used to simulate pollutant transport in the surf zone on a plane beach as reproduced in the current experiment. Comparisons between our dye transport experiment and numerical results were then also conducted;the data showed that the numerical results including Stokes drift agreed more closely with experimental results than those without it. The data showed that the pollutant was generally transported obviously shoreward in addition to its expected drift along the shore. We also suggest that Stokes drift plays an important role in pollutant movement in the surf zone, especially shoreward.

关键词： nearshore current model Stokes drift advection diffusion dye release surf zone

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铜银纳米合金团簇结构转变的原子模拟

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原子与分子物理学报 2025年第6期42卷 101-112页

作者：李博宇刘贯惟张林东北大学材料科学与工程学院沈阳110819 东北大学材料各向异性与织构教育部重点实验室沈阳110819

采用基于嵌入原子方法势的分子动力学方法对熔融Cu_(n)Ag_(53-n)(n=0~53)和Cu_(n)Ag_(54-n)(n=0~54)合金团簇的降温凝结过程进行模拟.通过结构相图、自由能、原子化能、形状因子、对分布函数、熵和直观可视化的原子堆积结构等多种计算... 详细信息

采用基于嵌入原子方法势的分子动力学方法对熔融Cu_(n)Ag_(53-n)(n=0~53)和Cu_(n)Ag_(54-n)(n=0~54)合金团簇的降温凝结过程进行模拟.通过结构相图、自由能、原子化能、形状因子、对分布函数、熵和直观可视化的原子堆积结构等多种计算分析手段,在原子尺度上探究温度、组分和初始构型等对小尺寸Cu-Ag合金团簇在降温凝结中的结构转变以及热力学量的影响.模拟结果表明,在室温下含有少量Cu原子的二元合金团簇可以形成的核壳式二十面体几何结构,同时Cu原子取代Ag原子也有助于合金团簇的稳定.组分的改变和温度的降低使堆积结构由无序变为有序,同时伴随着原子势能、形状因子、熵的振荡下降,低温阶段熵值下降明显.

关键词：纳米合金降温凝结分子动力学结构转变

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P-doped electrode for vanadium flow battery with high-rate capability and all-climate adaptability

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Journal of Energy Chemistry 2019年第8期28卷 55-59,I0003页

作者： Lihong yu Feng lin lin Xu Jingyu Xi School of Applied Chemistry and Biological Technology Shenzhen PolytechnicShenzhen 518055 Guangdong China Institute of Green Chemistry and Energy Graduate School at Shenzhen Tsinghua UniversityShenzhen 518055 Guangdong China

A phosphorous-doped graphite felt(PGF) is fabricated and examined as electrode for vanadium flow battery(VFB). P doping improves the electrolyte wettability of GF and induces more defect sites on its surface, resulting in significantly enhanced activity and reversibility towards VO2^+/VO2^+ and V^2+/V3^+couples. VFB with PGF electrode demonstrates outstanding performance such as high-rate capability under 50–400 mA cm^-2, wide-temperature tolerance at-20 °C–60 °C, and excellent durability over 1000 charge–discharge cycles. These merits enable PGF a promising electrode for the next-generation VFB,which can operate at high-power and all-climate conditions.

关键词： Vanadium flow battery Graphite felt P doping High-power electrode All-climate

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Site preferences of alloying transition metal elements in Ni-based superalloy: A first-principles study

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Chinese Physics B 2018年第9期27卷 469-476页

作者： Baokun Lul chong-yu Wang Zhihui Du Department of Physics Tsinghua UniversityBeijing 100084China Department of Computer Science and Technology Tsinghua UniversityBeijing 100084China

Atomistic characterization of chemical element distribution is crucial to understanding the role of alloying elements for strengthening mechanism of superalloy. In the present work, the site preferences of two alloying elements X -Y in γ-Ni of Ni-based superalloy are systematically studied using first-principles calculations with and without spin-polarization. The doping elements X and Y are chosen from the 27 kinds of 3 d, 4 d, 5 d group transition metals（Sc, Ti, V, Cr, Mn, Fe, Co,Cu, Zn, Y, Zr, Nb, Mo, Tc, Ru, Rh, Pd, Ag, Cd, Hf, Ta, W, Re, Os, Ir, Pt, Au） and Al. We find that the spin-polarized calculations for Re-Re, Re-Ru, Re-Cr, Ru-Cr show a strong chemical binding affinity between the solute elements and are more consistent with the experimental results. The binding energies of pairs between the 28 elements have an obvious periodicity and are closely related the electronic configuration of the elements. When the d-electrons of the element are close to the half full-shell state, two alloying elements possess attractive binding energies, reflecting the effect of the Hund＇s rule. The combinations of early transition metals（Sc, Ti, V, Y, Zr, Nb, Hf, Ta） have a repulsive interaction in γ-Ni. These results offer insights into the role of alloying elements for strengthening mechanism of superalloy.

关键词： superalloy transition metal binding energy cluster first-principles calculations

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The relation between the radii and the densities of magnetic skyrmions

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Communications in Theoretical Physics 2021年第7期73卷 146-154页

作者： yu-Jiao Bo Wen-Wen Li yu-Chen Guo Ji-chong Yang Department of Physics Liaoning Normal UniversityDalian 116029China

Compared with the traditional magnetic bubble,a skyrmion has a smaller size,and better stability and therefore is considered as a very promising candidate for future memory *** skyrmions are manipulated,erased and created,the density of skyrmions can be varied,however the relationship between the radii and the densities of skyrmions needs more *** this paper,we study this problem both theoretically and by using the lattice *** average radius of skyrmions as a function of material parameters,the strength of the external magnetic field and the density of skyrmions is obtained and *** this explicit function,the skyrmion radius can be easily predicted,which is helpful for the future study of skyrmion memory devices.

关键词： radius of a skyrmion shape of a skyrmion lattice simulation

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A Framework on Fast Mapping of Urban Flood Based on a Multi-Objective Random Forest Model

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International Journal of Disaster Risk Science 2023年第2期14卷 253-268页

作者： Yaoxing Liao Zhaoli Wang Chengguang Lai chong-yu Xu State Key Laboratory of Subtropical Building Science School of Civil Engineering and TransportationSouth China University of TechnologyGuangzhou510641China Pazhou Lab Guangzhou510335China Department of Geosciences University of Oslo0316OsloNorway

Fast and accurate prediction of urban flood is of considerable practical importance to mitigate the effects of frequent flood disasters in *** improve urban flood prediction efficiency and accuracy,we proposed a framework for fast mapping of urban flood:a coupled model based on physical mechanisms was first constructed,a rainfall-inundation database was generated,and a hybrid flood mapping model was finally proposed using the multi-objective random forest(MORF)*** results show that the coupled model had good reliability in modelling urban flood,and 48 rainfall-inundation scenarios were then *** proposed hybrid MORF model in the framework also demonstrated good performance in predicting inundated depth under the observed and scenario rainfall *** spatial inundated depths predicted by the MORF model were close to those of the coupled model,with differences typically less than 0.1 m and an average correlation coefficient reaching *** MORF model,however,achieved a computational speed of 200 times faster than the coupled *** overall prediction performance of the MORF model was also better than that of the k-nearest neighbor *** research provides a novel approach to rapid urban flood mapping and flood early warning.

关键词： Coupled model Designed rainfall events Multi-objective random forest(MORF)method Rainfall-inundation database Urban flood prediction

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Simulation of municipal solid waste gasification for syngas production in fixed bed reactors

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Journal of Zhejiang University-Science A(Applied Physics & Engineering) 2010年第8期11卷 619-628页

作者： chong CHEN yu-qi JIN Jian-hua YAN Yong CHI State Key Laboratory of Clean Energy Utilization Zhejiang University Hangzhou 310027 China

This study proposes a model of syngas production from municipal solid waste (MSW) gasification with air in fixed bed reactors. The model (using Aspen plus simulator) is used to predict the results of MSW gasification and to provide some process fundamentals concerning syngas production from MSW gasification. The effects of gasification temperature, air equiva- lence ratio and moisture concentration on the composition of syngas, lower heating value (LHV) of syngas, heat conversion efficiency, and carbon conversion are discussed. The results indicate that higher temperature improves gasification, and higher air equivalence ratio increases the carbon conversion while decreasing syngas LHV. Heat conversion efficiency increases and reaches the maximum and then decreases with the increase of air equivalence ratio. Higher moisture concentration increases the carbon conversion and increases the heat conversion efficiency at lower ratios. Higher temperature and a lower equivalence ratio are favorable for obtaining a higher LHV of syngas at the same moisture concentration.

关键词： Municipal solid waste (MSW) Gasification Syngas Aspen plus Fixed bed

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Study of the gluonic quartic gauge couplings at muon colliders

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Communications in Theoretical Physics 2023年第11期75卷 66-75页

作者： Ji-chong Yang yu-Chen Guo Yi-Fei Dong Department of Physics Liaoning Normal UniversityDalian 116029China Center for Theoretical and Experimental High Energy Physics Liaoning Normal UniversityDalian 116029China

The potential of muon colliders opens up new possibilities for the exploration of new physics beyond the Standard *** is worthwhile to investigate whether muon colliders are suitable for studying gluonic quartic gauge couplings(gQGCs),which can be contributed by dimension-8 operators in the framework of the Standard Model effective field theory,and are intensively studied *** this paper,we study the sensitivity of the processμ^(+)μ^(-)→jjν■to *** results indicate that the muon colliders with *** larger than 4 TeV can be more sensitive to gQGCs than the Large Hadron Collider.

关键词： gluonic quartic gauge coupling(gQGC) effective field theory(EFT) muon collider Vector Boson Fusion(VBF)

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Data mining and mathematical models in cancer prognosis and prediction

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Medical Review 2022年第3期2卷 285-307页

作者： chong yu Jin Wang Department of Chemistry and of Physics and Astronomy State University of New York at Stony BrookStony BrookNY 11794-3400USA State Key Laboratory of Electroanalytical Chemistry Changchun Institute of Applied ChemistryChinese Academy of SciencesChangchunJilinChina Department of Statistics JiLin University of Finance and EconomicsChangchunJilin ProvinceChina

Cancer is a fetal and complex *** differences of the same cancer type or the same patient at different stages of cancer development may require distinct *** differences are reflected in tissues,cells and gene levels *** interactions between the cancer cells and nearby microenvironments can also influence the cancer progression and *** is a huge challenge to understand all of these mechanistically and *** applied pattern recognition algorithms such as machine learning or data mining to predict cancer types or *** the rapidly growing and available computing powers,researchers begin to integrate huge data sets,multi-dimensional data types and *** cells are controlled by the gene expressions determined by the promoter sequences and transcription *** example,the changes in the gene expression through these underlying mechanisms can modify cell progressing in the *** molecular activities can be governed by the gene regulations through the underlying gene regulatory networks,which are essential for cancer study when the information and gene regulations are clear and *** this review,we briefly introduce several machine learning methods of cancer prediction and classification which include Artificial Neural Networks(ANNs),Decision Trees(DTs),Support Vector Machine(SVM)and naive *** we describe a few typical models for building up gene regulatory networks such as Correlation,Regression and Bayes methods based on available *** methods can help on cancer diagnosis such as susceptibility,recurrence,survival *** last,we summarize and compare the modeling methods to analyze the development and progression of cancer through gene regulatory *** models can provide possible physical strategies to analyze cancer progression in a systematic and quantitative way.

关键词： flux gene regulatory network landscape machine learning ordinary differential equations stochastic differential equations

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