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Table of Content

    20 July 2018, Volume 54 Issue 4
    Comparison of Tourist Thematic Sentiment Analysis Methods Based on Weibo Data
    LIU Siye, TIAN Yuan, FENG Yuning, ZHUANG Yulong
    2018, 54(4):  687-692.  DOI: 10.13209/j.0479-8023.2018.011
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    Six tourism themes, diet, entertainment, shopping, view, transportation, and accommodation, are selected for thematic sentiment analysis. 53140 Weibo items published by Chinese tourists in Japan are collected and manually labeled as the case study dataset. Maximum Entropy model and Support Vector Machine are adopted. The training results are both fairly good, where the resulting Maximum Entropy model prevails slightly. It can be concluded that machine learning models are reasonably feasible in tourist thematic sentiment analysis. Moreover, the experiment also shows that the models can be improved by introducing emoticon icons and thematic words as supplements to traditional word features.

    Fixed Point Theorems under c-Distance in Cone Metric Spaces over Banach Algebras
    HUANG Huaping, DENG Guantie
    2018, 54(4):  693-698.  DOI: 10.13209/j.0479-8023.2017.184
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    The authors obtain several theorems of the existence and uniqueness of fixed point for contractive mappings under c-distance in cone metric spaces over Banach algebras without the assumptions of normality of cones and the continuity of mappings. The results greatly improve and complement some previous results. Moreover, a supportive example to illustrate the main assertions is also given. Otherwise, by solving the problem of existence and uniqueness for an elementary equation, a significant application for the obtained results is presented.

    Laboratory Study of Factors Impacting Measurements of the Cloud Condensation Nuclei Number Concentration
    TAO Jiangchuan, ZHAO Chunsheng, MA Nan, HUANG Mengyu
    2018, 54(4):  699-704.  DOI: 10.13209/j.0479-8023.2017.104
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    Aerosol activity of forming cloud droplets affects cloud micro-physics and indicates aerosol hygroscopicity. Application of the cloud condensation nuclei (CCN) counter (CCNC) is an important method for studying CCN-active particles. Factors impacting measurements using CCNC are analyzed by laboratory study. In CCNC, variations of supre-saturations (SS) are found to be proportional to variations of the pressure and the flow-rate. Temperature conditions, under which CCNC is working, exhibit nonlinear influnces on SSs in CCNC. Varying aerosol losses with particle size due to the pressure adjustment is found when differential pressure is higher than 300 hPa. Underestimation of CCN number concentration is found when particle number concentration is higher than 10000/cm3 and SS in CCNC is lower than 0.2%. This is because only part of CCN-active particles can activate due to the vapor depletion in CCNC. The results and suggestions provide instructions for CCN measurment and would help improving quality control and analysis of CCN data.

    Interdiurnal and Diurnal Variation of PM2.5 Concentration in Beijing, Shanghai, and Lhasa in 2015
    ZHANG Dongjian, XUE Huiwen
    2018, 54(4):  705-712.  DOI: 10.13209/j.0479-8023.2018.021
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    The temporal variation of PM2.5 concentration in Beijing, Shanghai and Lhasa in 2015 is investigated. Then, the analyses on their seasonal variation and comparison of the relative importance of diurnal variation and daily variation are conducted. Results show that the PM2.5 concentration is generally higher in winter than that in summer from a long-term view. From a short-term view, the variation of PM2.5 concentration in Beijing and Shanghai mainly demonstrates interdiurnal feature, and the synoptic systems exert profound impacts. The wintertime PM2.5 concentration in Beijing also displays diurnal variation, but it is not evident in summer. In Shanghai, the diurnal cycle is not significant in both winter and summer. On the contrary, the synoptic system over Lhasa is stable. The daily variation is weak, while the diurnal variation is strong. The variation of PM2.5 concentration is hence featured by two peaks.

    Statistics of Environmental Vertical Wind Shear and Water Vapor Field on the Change of Tropical Cyclone Structure in Northwest Pacific Ocean from 2001 to 2014
    FENG Qian, ZHANG Qinghong
    2018, 54(4):  713-720.  DOI: 10.13209/j.0479-8023.2017.141
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    A total of 4967 observations of 385 tropical cyclones (TCs) in the Northwest Pacific Ocean from 2001 to 2014 from the Best Track data, the Tropical Rainfall Measuring Mission (TRMM) satellite data and the National Centers for Environmental Prediction (NCEP) reanalysis data were classified to compare and analyze the response of environmental vertical wind shear and water vapor field on TC structural change. The results show that intensify TCs are mainly accompanied by east wind shear, and weaken TCs are mainly accompanied by west wind shear. Under the strong vertical wind shear (v > 5 m/s), there is no obvious water vapor anomaly on TC structural change. Under the weak vertical wind shear (v ≤ 5 m/s), the intensify (weaken) TC is accompanied by positive (negative) water vapor anomaly.

    Utilizing Back-Projection Method Based on 3-D Global Tomography Model to Investigate Mw 7.8 New Zealand South Island Earthquake
    LIU Zhipeng, SONG Chao, GE Zengxi
    2018, 54(4):  721-729.  DOI: 10.13209/j.0479-8023.2017.105
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    Based on a 3-D global velocity structure model, the authors used teleseismic P wave data from Asian and South American array to image the rupture process of 2016 Mw 7.8 New Zealand earthquake via backprojection analysis. The results show that the rupture is a unilateral one with northeast direction, extending to the ocean. The rupture speed is about 1.65 km/s. There are two phases dominated by high frequency power radiation, occurring during 20−40 s and 60−80 s, respectively. The second phase is the major one, whose distribution of low frequency power radiation is consistent with the centroid location of the event. The high frequency back projection result of the South American data is better correlated with the peak ground acceleration result. According to the comparison and analysis of the Asian and South American results, it could be inferred that in order to obtain more detailed rupture information of high frequency, the data of array deployed in the region with lower 3-D heterogeneity should be adopted in back projection analysis to enhance the coherency of waveforms.

    Fault Structure Detection by Matched Filter Technique
    WU Mengyu, MAO Shujuan, NING Jieyuan, TANG Qijia, JIANG Yiran
    2018, 54(4):  730-738.  DOI: 10.13209/j.0479-8023.2017.099
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    Based on matched filter technique (MFT) and earthquake relative location technique, a new method is proposed to detect fault structure. The weak matched filter technique (WMFT) is modified from MFT to find more similar earthquakes, which is now used to detected events different from known templates in location. After new events are detected, their locations relative to templates can be given by using time differences from cross correlation. Due to low requirement of the WMFT in wave similarity and its low computational cost, more events can be detected and might help depict the structure of faults clearly. The feasibility of this method is primarily proved by the study of Bohai Bay area using records of 40 days.

    Redox Variation during the Early and Middle Ordovician in South China and Its Implication to the Great Ordovician Biodiversification Event
    DONG Yiting, LIU Jianbo, CHEN Yuxuan, ZHONG Si, ZHAN Renbin
    2018, 54(4):  739-751.  DOI: 10.13209/j.0479-8023.2017.133
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    To improve understanding of the environmental influential and controlling factors of the Great Ordovician Biodiversification Event (GOBE), total organic carbon content (TOC), total sulfur content (TS), and sulfur isotope of pyrite (δ34Spy) of black shale of the Jiangjunling section, in southern Anhui Province, China are analyzed. TOC and TS show positive correlation, indicating non-euxinic environment. δ34Spy exhibits obvious decrease in Floian and more oscillation in the Middle Ordovician. Combined with global sulfur isotope of carbonate-associated sulfate (δ34SCAS) and δ34Spy data from previous researches, a marine oxygenation event is suggested by decreasing pyrite burial and increasing sulfur isotopic fractionation during the latest Tremadocian to middle Floian, which might boost GOBE. During the late Floian to Darriwilian, δ34SCAS from different areas decreases in succession, while δ34Spy is characterized by large oscillation, which is contributed to low sulfate concentration and sulfide reoxidation in the ocean.

    Biostratigraphy and Chemostratigraphy Across the Lower Kellwasser Boundary in Laye Section, Guizhou Province
    CHANG Jieqiong, BAI Zhiqiang, LI Yukun, GUO Jianxiang, PENG Yongbo, SHEN Bing
    2018, 54(4):  752-762.  DOI: 10.13209/j.0479-8023.2018.013
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    In order to study biostratigraphy and chemical stratigraphy during the Lower Kellwasser event, high resolution conodonts research and chemostratigraphic framework were carried out. The data reveals that the inorganic and organic carbon isotope have a significant positive excursion at the bottom of the Laye section. It is considered that the sample LY-8 is consistent with the Lower Kellwasser boundary. The main reason for the change of carbon isotope in this area is the increase of organic carbon burial, which is caused by the increase of marine primary productivity and anoxia environment possibly.

    Zircon U-Pb Dating and Geochemical Analysis of Ore-Bearing Intrusions of Dasuji Porphyry Mo Deposit
    LIAO Manqi, LAI Yong, ZHOU Yitao, SHU Qihai
    2018, 54(4):  763-780.  DOI: 10.13209/j.0479-8023.2018.007
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    In order to study the age, geochemical characteristics and tectonic genesis of the ore-bearing intrusions of Dasuji porphyry Mo deposit, three kinds of rock samples of quartz porphyry, syenogranite and granite porphyry that are related to molybdenum mineralization were collected from the deposit. Zircon U-Pb dating reveals that the ages of quartz porphyry, granite porphyry and syenogranite are 231, 227 and 225 Ma, respectively. Characteristics of major and trace elements indicate that they belong to high-K calc-alkaline to shoshonite series and highly fractionated I-type granite. Geochemistry of the rock associations, integrated with regional geology indicate that Dasuji area was in extension during Indosinian. The upwelling of asthenosphere triggered partial melting of crust in a wide range of depth. Magma related to this deposit was generated in this process. During ascending, the magma extracted ore elements from protore which had collected ore elements in the pre-Mesozoic during multiple geological activities and the magma became more enriched in Mo due to the extensive crystal fractionation. When volatiles in magma were supersaturated, ore-forming fluid was separated from melt with Mo. Ore minerals were mainly precipitated with quartz and filled in the fractures during the boiling process.

    Origin of Mg-Rich-Fluids and Dolomitization of Lower Ordovician Penglaiba Formation at Tongguzibulong Outcrop in the Northwestern Margin of Tarim Basin
    HE Yong, LIU Bo, LIU Hongguang, SHI Kaibo, WANG Yuanchong, JIANG Weimin
    2018, 54(4):  781-791.  DOI: 10.13209/j.0479-8023.2018.006
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    Based on comprehensive analysis of field work, petrological and geochemical characteristics, the authors study the sources of dolomitizing fluids and the models of dolomitization of the Lower Ordovician Penglaiba Formation in Tongguzibulong Outcrop, the northwestern margin of Tarim Basin, China. Four types of
    dolomite are recognized: euhedral-subhedral powder crystallized dolomite, euhedral-subhedral fine crystallized dolomite, subhedral-xenotopic medium crystallized dolomite and subhedral-xenotopic coarse crystallized dolomite. Powder-fine crystallized dolomite is distributed in the lower part of Penglaiba Formation, and has cloudy center surrounded by clear rim. With residual sand texture, inter-crystal pores and inter-partical pores, medium-coarse crystallized dolomite is distributed in the upper part of Penglaiba Formation. The REE patterns of dolomite and contemporaneous limestone rich in LREE and deplete in HREE, present a trait of unobvious Ce anomaly and Eu negative anomaly, the values of C-O isotope locate in the scope of contemporaneous marine dolomite, and Eu negative anomaly. All these denote that the dolomitizing fluid is normal or slightly concentrated seawater. Besides, Powder-fine crystallized dolomite present a low value of Fe, Mn and a high value of Sr, Ba, formed by reflux seepage dolomitization in penesaline seawater. Cloudy center surrounded by clear rim texture and multi-rimmed texture are the results of over-dolomitization. Medium-coarse crystallized dolomite with residual grain texture, interbedded with sand limestone, are controlled by high frequency sea level change. With a higher value of Fe, Mn and a lower value of Sr, Ba when compared with powder-fine crystallized dolomite, medium-coarse dolomite formed by the early reflux seepage dolomitization and intensified by the subsequent burial recrystallization.

    Bashang Forest Change Monitoring with Multi-Temporal MODIS Images and Random Forest Algorithm
    ZHOU Jianing, ZHANG Jie, LI Tianhong
    2018, 54(4):  792-800.  DOI: 10.13209/j.0479-8023.2018.010
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    In order to reveal the dynamic characteristics of the forest in Bashang area of Hebei Province, MODIS reflectivity and NDVI data with a spatial resolution of 250 m were used for forest classification, and a Thematic Mapper (TM) image in 2005 was resorted to aid training sample selection. With Random Forest Algorithm and time series of MODIS images, the forest in Bashang area was monitored from 2000 to 2015 in every two years. Compared with widely used classifiers such as maximum likelihood classifier and BP artificial neural network algorithm, Random Forest classifier showed the best performance with its overall accuracy and Kappa coefficient being 91.89% and 0.88 respectively. Binary coding was applied to the eight phases of forest distribution images, which can easily and rapidly reflect the changing trajectory from phase to phase. It showed that the severe forest changes mainly occurred in counties of Fengning, Weichang, Zhangbei and Guyuan during the years of 2000, 2010, and 2013.

    Public’s Protective Response to Urban Air Pollution
    XIA Tian, XU Jianhua
    2018, 54(4):  801-806.  DOI: 10.13209/j.0479-8023.2017.190
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    From a social-psychological perspective, this paper studies people’s protective behavior in response to health risks posed by air pollution. A questionnaire survey was conducted in Haidian, Chaoyang, Xicheng and Fengtai Districts in Beijing, and a sample of 993 respondents based on quota sampling techniques was collected. Based on Health Belief Model, ordinary least square regression was used for examining determinants of protective behaviors. The key finding is that the predictors of the adaptation behavior are consistent with the basic constructs for explaining health protective behavior in the health domain, which are perceived level of risk, perceived barriers, and perceived effectiveness. The result supports the thought of borrowing knowledge from the health domain to the environmental domain in designing policy instruments to cope with environmental risks.

    Differences in Exhaled VOCs from Patients with Upper Respiratory Tract Infection and Healthy Ones
    WANG Jue, ZHENG Yunhao, LIU Zhaorong, YAO Maosheng, LI Xiaoguang, ZHUANG Jia, PENG Wangyuan
    2018, 54(4):  807-814.  DOI: 10.13209/j.0479-8023.2017.191
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    Analysis of exhaled VOCs from health and patients may help building association between VOCs and different diseases condition, which could offer a possibility of noninvasive monitoring of disease. VOCs were collected in 30 healthy subjects and 60 patients with upper respiratory tract infection. Analysis of 97 VOCs was
    performed by gas chromatography and mass spectrometry (GC-MS). The concentration of alkanes, alkenes, halogenated hydrocarbon, oxygenated hydrocarbons and aromatic hydrocarbons in health and patients breath was analyzed. Analysis of variance (ANOVA), principal component analysis (PCA) were used to analyze the VOC differences from patients and healthy ones. The results show that the concentration of isoprene differ among patients, healthy ones and indoor air (P<0.05). Patients show higher concentration of n-pentane compared to healthy ones (P<0.05). Patients with bacterial upper respiratory tract infection show higher concentration of propanal compared to healthy ones. The results of PCA show that there were significant VOC differences between patients with upper respiratory tract infection and healthy ones (P=0.019), but no differences between bacterial and non-bacterial upper respiratory tract infection.

    Photocatalytic Degradation and Reaction Pathway of EE2 in Aqueous Solution by TiHAP
    JU Chuanlun, ZHANG Jianwei, SUN Weiling, Wakamurac Masato, Tsukadad Mineharu, Sasa Masaaki
    2018, 54(4):  815-827.  DOI: 10.13209/j.0479-8023.2017.188
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    Selecting 17α-ethynylestradiol (EE2) as the target pollutant and TiHAP as the catalyst, comparative studies of the photocatalytic degradation of TiHAP and TiO2 were conducted, and the influencing factors and intermediate products were also investigated. The results show that the EE2 degradation rate by TiHAP film was faster than that by TiO2 film. The EE2 degradation rate of TiHAP remained the same with the increase of Fe3+ concentration, but decreased with the increase of FA concentration. For TiO2, the EE2 degradation rate initially increased and then decreased with increasing Fe3+ concentration, and increased with increasing FA concentration. The photocatalitic degradation intermediates of EE2 by TiHAP were identified by LC-MSn. The results show that nine kinds of intermediates were identified. Compared with TiO2, more kinds of intermediates were identified for EE2 photocatalytic degradation by TiHAP. Transformation of the phenolic moiety, hydroxylation, ring opening and carboxylation, and carboxylation were the primary reaction pathways.

    Fine Root Productivity and Turnover Rate Respond Nonlinearly to Increased Nitrogen Availability
    ZHANG Jiangyong, WANG Wei, ZENG Hui
    2018, 54(4):  828-838.  DOI: 10.13209/j.0479-8023.2018.002
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    A N addition experiment was established with four treatments: control (no fertilization), low-N (20 kgN/(hm2·a)), medium-N (50 kgN/(hm2·a)) and high-N fertilization (100 kgN/(hm2·a)) in an N-limited Pinus sylvestris forest in Hebei Province, North China to study the production, biomass and turnover of fine root systematically. The results showed that fine root productivity (NPPfr) increased in low-N plots, decreased in high-N treatment, while the proportion of NPPfr to net primary productivity (NPP) reduced in low-N addition and increased in medium-N addition. With the increase of N availability, root biomass decreased, turnover rate increased, and carbon returned to soil decreased at first and increased later. The influence of N availability on NPPfr didn’t change with depth, while turnover rate varied among depth. N-addition made an impact on fine root productivity through soil nitrogen content, soil carbon content and soil pH, while affecting turnover rate of fine root by root carbon and nitrogen content.

    Leaf Stomatal Traits of Woody Plants and Their Response to Nitrogen Addition in Typical Forests in Eastern China
    JIANG Xingxing, ZOU Anlong, WANG Yuanyuan, ZHOU Xuli, JI Chengjun
    2018, 54(4):  839-847.  DOI: 10.13209/j.0479-8023.2018.003
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    The stomatal traits of eighteen dominant woody plants in the Nutrient Enrichment Experiments in Chinese Forests (NEECF) were compared. The results showed that the lifeform affects stomatal features of the woody plants significantly (P<0.05). There is a visible latitudinal pattern of stomatal traits of dominant woody plants in eastern China and MAT, MAP, PET are important influent factors. All woody plants’ stomatal traits have significant correlation. The stomatal length and density showed negative correlation, and the stomatal conductance increased with increasing stomatal length and decreased with increasing stomatal density. Woody plants of different climate zones and lifeform showed diverse response with nitrogen addition.

    Spatiotemporal Distribution and Its Influence Factors of Diatoms in the Middle and Lower Reaches of Hanjiang River
    LIU Qingxiang, WANG Ting, XU Xuming, NI Jinren
    2018, 54(4):  848-856.  DOI: 10.13209/j.0479-8023.2018.005
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    To study the temporal and spatial distribution and its influence factors of diatoms in the middle and lower reaches of Hanjiang River, diatom in water and sediment were sampled from 5 monitoring sites in Spring and Fall, 2014. Based on 18S rRNA Illumina Miseq high-throughput sequencing technology, 160 species belonging to 111 genuses, 49 families, 28 orders and 3 classes were identified, of which sediment diatom genuses accounted for 98.6%. The species abundance was higher than that of the previous studies, suggesting the significant advantage of high-throughput sequencing technology in diatom identification. The community composition and dominant species in water and sediment were remarkably different, i.e., Pinnularia, Cyclotella and Nitzschia were the dominant species in water, while the dominant species in sediment were Pinnularia, Nitzschia and Navicula. Meanwhile, there exists obvious difference in temporal and spatial distribution of diatom community, due to the fact that Shannon diversity index displayed apparent spatial heterogeneity and diatom species in sediment were higher than that in water; from the view of season changes, the Shannon diversity index in fall were higher than that in spring. Furthermore, total nitorgen, ammonia nitrogen, nitrate and total phosphorus displayed great impact on diatom community composition. As results, controlling nitrogen and phosphorus concentration in the middle and lower reaches of Hanjiang River will be of great importance to avoid diatom blooms.

    Analysis of Accident Risk in China,s Petrochemical Industry
    ZHAO Yan, XU Jianhua
    2018, 54(4):  857-864.  DOI: 10.13209/j.0479-8023.2018.008
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    To design good policies for managing accident risk in petrochemical industry requires a sound understanding on the accident risks in the petrochemical industry. The authors estimated the parameters of the distributions of the frequencies and consequences of accident risks in the petrochemical industry by using Hierarchical Bayesian Analysis, based on the information of 1479 accidents in petrochemical industry from 2006 to 2015 collected from multiple sources. It was concluded that the frequency of the accidents in China’s petrochemical industry follows Poisson distribution with its mean being 156.00, the fatalities of the accidents follows generalized Pareto distribution with its scale parameter being 1.40 and its shape parameter being 0.36. The parameters of the distributions of the frequencies and consequences of accident risks vary sharply across regions.

    Optimization of Microbial Fuel Cells for Remediation of Vanadium Contaminated Groundwater Using Response Surface Methodology (RSM)
    YANG Meng, ZHANG Baogang, LI Jiaxin, CHENG Ming, YANG Qingshi
    2018, 54(4):  865-872.  DOI: 10.13209/j.0479-8023.2017.139
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    Response surface methodology (RSM) is utilized to analyze and optimize the experimental condition of V(Ⅴ) removal in single chamber microbial fuel cell (MFC). The influences of initial vanadium concentration, COD and electrolyte conductivity on V(Ⅴ) removal efficiencies are investigated when sodium acetate is adopted as carbon source in single chamber MFC. The results of RSM with three factors at three levels reveal that the initial vanadium concentration has the most significant effect on V(Ⅴ) removal efficiencies, followed by the COD, whereas the influence of the electrolyte conductivity is minimal. The optimal experimental condition obtained by RSM is initial V(Ⅴ) concentration of 75.44 mg/L, COD of 1007.48 mg/L and electrolyte conductivity of 11.98 mS/cm, in which condition the theoretical maximum V(Ⅴ) removal efficiency of 80.31% can be achieved. Verification test is also conducted and the results further confirm the reliability of the optimization. The results of the present study will promote the application of MFC in the remediation of vanadium contaminated groundwater.

    Categorization on Sponge Measurements in Lingnan Rural Area
    JIANG Danning, WANG Zhifang, CHEN Yufeng, ZHANG Zijiao, YANG Shaodong
    2018, 54(4):  873-882.  DOI: 10.13209/j.0479-8023.2018.023
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    Focusing on historic, cultural and old villages in Guangdong Province, the authors extract and synthesize features and information on sponge measures applied by local villages. Based on aerial map on Google Earth, the pattern of the settlement and water system are observed and categorized. Based on 30 m DEM picture of Guangdong Province in ArcGIS, landscape and the graded water system of the whole province and the elevations of all villages are extracted, followed by inundation analysis. The level of the rain intensity in different parts of the province is also considered. 5 features are coded and input into SPSS. By hierarchical cluster analysis, the villages are classified. The study generalizes the sponge measures of all classifications and concludes with 4 kinds of sponge measures in villages in Lingnan area: terrain utilization, slowed runoff through impoundment, strategically directed runoff, and forced drainage. Suggestions are proposed to promote the application of traditional ecophronesis in modern urban practices in Linghan area.

    Revealing the Mechanism of Hydrolysis and Metal Complexation of Kaempferol by Differential Absorbance Spectra and TD-DFT Calculations
    HAN Xuze, YAN Mingquan
    2018, 54(4):  883-889.  DOI: 10.13209/j.0479-8023.2017.117
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    In order to reveal the mechanism of hydrolysis and metal complexation of kaempferol, the UV-vis spectra of kaempferol in hydrolysis process (pH from 2.01 to 13.00) and in Cu(II) complexation process (from 0.1 to 2710.9 μmol/L) was obtained, and the characteristic spectra at various reaction stages was obtained by differential treatment. Combined with quantum chemical theoretical computation, a variety of possible deprotonation structures, complexation structures and corresponding electron absorption spectra were calculated based on DFT (Density Functional Theory) and TD-DFT (Time-Dependent Density Functional Theory). The experimental results are compared with the calculated values and it indicates that the hydrolysis process is in the deprotonation order of 7, 4′, 3, 5 phenolic group; at low concentrations of Cu(II) (<67.9 μmol/L), Cu(II) chelated with 4,5 phenolic group simultaneously; at high concentration of Cu(II) (67.9–2710.9 μmol/L), Cu(II) chelated with 3,4 phenolic group simultaneously. The calculated spectra is consistent with experimental spectra in hydrolysis and Cu(II) complexation process of kaempferol. The appearance of characteristic peaks is due to the change of the electron distribution of the active groups before and after hydrolysis and Cu(II) complexation, resulting in the changes of energy gap from HOMO (highest occupied molecular orbital) to LUMO (lowest unoccupied molecular orbital) during photon irradiation. The mechanism of hydrolysis and metal complexation process of kaempferol was revealed.

    A Study on the Response Relationships between Degradation Rate and Degradation Functional Genes of Dibenzothiophene in Bohai Rim Typical Wetland Sediments at Different Temperatures
    HUANG Siqiao, JI Guodong
    2018, 54(4):  890-898.  DOI: 10.13209/j.0479-8023.2017.185
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    In order to reveal the dibenzothiophene (DBT) degradation pathway in Bohai Rim typical wetland sediments at different temperatures, three different types of wetland sediments were chosen: reed wetland sediments (RWS) collected from Liao River estuary, tidal wetlands sediments (TWS) collected from Beida harbor and estuary wetland sediments (EWS) collected from Yellow River estuary. These samples were cultured for 56 days under the condition of simulating the seasonal temperature. The degradation rates were determined and the abundance of DBT degradation functional genes were analyzed. The DBT degradation pathways in different wetland sediments and at different temperatures were analyzed using a quantitative response model established between DBT degradation rate and degradation functional gene groups. Results show that the degradation rate and the abundance of degradation functional genes are basically improved with the increase of temperature. At 4ºC, the trend of DBT degradation rate is EWS>TWS>RWS; while at 30ºC, it is TWS>EWS>RWS. Functional genes catA and dszB affect DBT degradation rate. Kodama pathway functional genes nagAc/nahAc and nidA are the main functional genes for DBT degradation in all the three typies of wetland sediments at low temperature while nidA is the the main at medium temperature. The 4S pathway gene dszB plays an important role for DBT degradation.

    Preparation and Optimization of a Novel Magnetic Chitosan/Sodium Alginate Composite Gel Bead
    TAO Huchun, LI Shuo, ZHANG Lijuan, LI Jinbo, YANG Sai
    2018, 54(4):  899-906.  DOI: 10.13209/j.0479-8023.2017.186
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    Using sodium alginate hydrogel as skeleton, in combination with chitosan and magnetic Fe3O4, a new type of magnetic chitosan/sodium alginate gel bead was prepared. On this basis, through the orthogonal experiment and single-factor experiment, the authors optimized the preparation conditions for composite gel bead, and determined the optimum one. The influences of many preparation impact factors on adsorption performance were examined. Results show that the optimal preparation conditions for the composite gel bead is as follows. Concentration of calcium chloride is 2.5 g/L, concentration of sodium alginate is 24 g/L, the amount of chitosan addition is 5 g/L, and the amount of magnetic liquid addition is 4.64 g/L. The optimal gel bead is a smooth, uniform, black ball with about 2 mm in diameter. By Fourier transform infrared spectroscopy (FTIR), synchronous thermal analysis (TGA) and other means of characterization, the adsorption mechanism is analyzed. Thermogravimetric analysis results show that the gel bead has good thermal stability. FTIR results prove that many active functional groups (amino group, hydroxyl group and carboxyl group) exist on the surface of gel bead. The adsorption performance test shows that adsorption ratio of 20mg MCSB on 40mL 25mg/L Cu2+ solution is 78.13%. The magnetic chitosan/sodium alginate gel bead is a novel simple-prepared and effective composite adsorbent.

    Preparation and Optimization of a Palladium Ion Imprinted Polymer
    TAO Huchun, LIU Wei, HUANG Shuaibin, CHENG Ling
    2018, 54(4):  907-914.  DOI: 10.13209/j.0479-8023.2018.015
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    Palladium (II) ion imprinted polymers (IIP) were prepared by precipitation polymerization method using PdCl42– as template, 4-vinylpridine(4-VP), 2-(allylthio)nicotinic acid (ANA), 2-Acetamidoacrylic acid (AAA) as functional monomer, respectively. In the polymerization method, the polymerization mixture included ethylene glycoldimethacrylate (EGDMA, cross-linking monomer), 2,2-azobisisobutyronitrile (AIBN, initiator) and methanol (porogen). The effects of different preparation conditions on the preparation of palladium ion imprinted polymers were investigated by the type of functional monomers, the dosage of functional monomers and crosslinking agents. The optimization results showed that compared with ANA and AAA, 4 -VP could form a stable complex with PdCl42– in the molar ratio of 4:1 with the largest binding constant and the best imprinting effect, which was the best choice for the synthesis of palladium (II) ion imprinted polymer. Furthermore, the adsorption experiment proved the adsorption capacity of 4-VP on its corresponding imprinted polymers in accordance to the ratio of template, functional monomer and cross-linking monomer as 1:4:40 reached a maximum of 5.042 mg/g.