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Table of Content

    20 September 2020, Volume 56 Issue 5
    Effect of Interface Tangential Relative Motion Caused by Vibration on Friction
    LU Jiandong, ZHAO Zhen
    2020, 56(5):  777-784.  DOI: 10.13209/j.0479-8023.2020.056
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    In order to study the effect of vibration on friction at contact interface, an experimental device was designed. The slider sliding at uniform speed on the vibrator was taken as the object. The mechanism of friction reduction caused by normal vibration and tangential vibration at interface was analyzed by means of experiment and theory. The experimental results show that normal vibration and tangential vibration often exist simultaneously. When the interface vibrates and the direction of the tangential relative velocity between the slider and the vibrator remains constant, the average sliding friction force of the slider is the same as that without vibration, and there is no friction reduction effect. When the interface vibrates and the tangential relative velocity direction changes periodically or stick-slip, there is an obvious friction reduction effect compared with that without vibration. Coulomb’s friction law was used to establish a dynamic model for simulation, and the simulation results are in good agreement with the experimental results, indicating that Coulomb’s friction model could reflect the friction between interfaces under the condition of known interface motion. The experimental and theoretical results show that the main reason for friction reduction is the periodic change of friction direction between interfaces or stick-slip caused by the tangential relative motion due to the vibration, when normal vibration and tangential vibration exist at the same time. 
    Research on Cleaning and Repairing Methods of Civil Building Data on Resources Saving and Environment Protection
    SHEN Hongyi, XU Fangfang, WANG Xinmin
    2020, 56(5):  785-795.  DOI: 10.13209/j.0479-8023.2020.019
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    Aiming at the data quality issues existing in the original civil building data on resources saving and environment protection, various methods are used to achieve data cleaning and data repairing. In terms of data cleaning, the authors focus on the approximately duplicated records and abnormal records in the energy consumption data of single building. In particular, the methods for identifying abnormal records include the empirical rule, the DBSCAN clustering algorithm, and inner fence of boxplot. In terms of data repairing, the authors focus on completing missing values and using the models to achieve data correction. In particular, the missing values are filled in these ways: existing values in the datasets, the predicted values of the linear regression model, and the output of the user-based collaborative filtering recommendation algorithm. The average absolute error is used as an evaluation index to compare these filling results. While repairing the building energy consumption data from Shanghai, multiple linear regression, principal component regression, partial least squares regression, ridge regression and Lasso regression are used to fit the correlation between building energy consumption and explanatory variables. The results show that for the energy consumption data of single building, it’s suitable to use the inner fence of boxplot to identify abnormal records, and use the median to complete missing values. For the building energy consumption data from Shanghai, the ridge regression model fits best.
    Prediction of PM2.5 Hour Concentration Based on U-net Neural Network
    LI Yihang, ZHAI Weixin, YAN Hanqi, ZHU Daoye, TONG Xiaochong, CHENG Chengqi
    2020, 56(5):  796-804.  DOI: 10.13209/j.0479-8023.2020.065
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    Most of the previous PM2.5 prediction models present unsatisfactory performance in several aspects, including predicting accuracy and generalization ability, especially in case of the sudden change in the value of PM2.5 situation. Therefore, we propose a method based on the U-net neural network to predict the hourly PM2.5 concentration value on the research area, attempting to improve the prediction performance. The proposed model includes two major steps. First, based on the inverse distance interpolation of historical wind field data, discrete station PM2.5 values are interpolated into a PM2.5 grid map; second, the U-net neural network is applied to train the prepared spatiotemporal grid data and make predictions. The model can use the PM2.5 concentration values of the grid map extracted at different time stamps for the PM2.5 prediction. The PM2.5 concentration values at all locations in the research region can be achieved. Specifically, the prediction accuracy and the generalization ability of the model in case of sudden changes are revealed. Experimental results indicate that the proposed method has a 10% improvement in the prediction accuracy of PM2.5 concentration values in the case of sudden change.
    CMIP5 Climate Multi-model Ensemble Optimization Based on Spatial-Temporal Distribution
    ZUO Zhengkang, ZHANG Feizhou, ZHANG Ling, SUN Yiyuan, ZHANG Ruihua, YU Tian, LU Jianzhong
    2020, 56(5):  805-814.  DOI: 10.13209/j.0479-8023.2020.057
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    The multi-mode ensemble based on spatiotemporal distribution is constructed to reduce the uncertainty of a single-model and the non-uniform distribution of the traditional model ensembles. The improved genetic algorithm is employed to optimize the multi-model ensemble of CMIP5 global climate data from temporal and spatial scales, and Taylor diagram is used to evaluate its simulation performance. The experimental results show that the multi-mode ensemble based on spatiotemporal distribution is superior to the traditional equal weight multimode ensemble scheme.
    Synoptic Characteristics Associated with Aerosol Pollution during the Same Period of Beijing Olympic and Paralympic Winter Games in History
    MIAO Yucong, PENG Yanyu, LI Jian, ZHANG Gen
    2020, 56(5):  815-823.  DOI: 10.13209/j.0479-8023.2020.062
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    To understand the complicated relationships between synoptic forcing, regional transport and aerosol pollution during the same period of the Beijing Olympic and Paralympic Winter Games in history from 2015 to 2019, long-term meteorological observations, aerosol measurements and radiosonde data in Beijing and Zhangjiakou were analyzed, in combination with numerical simulation and objective synoptic classification. It’s found that the heavy aerosol pollution in both Beijing and Zhangjiakou is associated with warm, moist, and calm wind situations at the ground level. At the upper level, the heavy pollution events in Beijing are related to the 850 hPa southwest winds, and the heavy pollutions in Zhangjiakou are typically associated with the southwest and south winds. Although the distance between the centers of Beijing and Zhangjiakou is around 160 km, the increasing aerosol concentrations and occurrence of thermal inversion aloft are often synchronously observed in those two cities, which are relevant to certain large-scale synoptic patterns. When there is a high-pressure system in eastern China at the 850 hPa level, the warmer air mass in the southern regions can be brought to Beijing and Zhangjiakou, enhancing the thermal inversion and suppressing the development of boundary layer to some extent. Meanwhile, the aerosols emitted from the south Hebei, the north Shanxi and middle Inner Mongolia can be transported to Beijing, leading to the exacerbation of pollution. With a higher altitude, the polluted air masses advected to Zhangjiakou are mainly from the western upstream regions, which can deteriorate the air quality in addition to the local emissions. Thus, under the unfavorable synoptic conditions, joint efforts to reduce emissions in Beijing, Zhangjiakou, and those upstream regions should be considered to effectively mitigate the heavy pollution.
    Effect of Environment Wind on Measurement of Optical Disdrometer
    ZHENG Zheng, LIU Xiaoyang, ZHOU Shougen, WANG Pengfei
    2020, 56(5):  824-834.  DOI: 10.13209/j.0479-8023.2020.055
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    To analyze the data detected by optical disdrometer under the influence of environment wind, this paper uses data measured by OTT-Parsivel and ultrasonic anemometer during several precipitation processed in 2018 in Beijing, and studies how horizontal and vertical wind affect the measurement of disdrometer respectively. When horizontal wind speed is less than 10 m/s and vertical wind speed is less than 0.4 m/s, more than 80% vertical wind speed estimated by velocity of hydrometeors from OTT-Parsivel are consistent with that given by anemometer. While the correction of velocity of hydrometeors brings significant change to raindrop whose diameter is about 1 mm, thereby affects other parameters. Moreover, this paper defines two feature parameters calculated from size and velocity of hydrometeors: the average of standard deviation and the ratio of outlier, which can distinguish more than 80% samples with horizontal wind speed more than 10 m/s. 
    A Modeling Study of the Impact of Tibetan Plateau on the North African Precipitation
    CHEN Zhihong, YANG Haijun
    2020, 56(5):  835-843.  DOI: 10.13209/j.0479-8023.2020.063
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    The impact of Tibetan Plateau (TP) on the North African precipitation is investigated using a fully coupled climate model (CESM1.0). Results from sensitivity experiments show that when the TP is removed, first of all the atmospheric circulation responds quickly and there are enhanced northeastward moisture transport from the tropical Atlantic Ocean to the North Africa and the westward moisture transport from the Indian Ocean to the North Africa. As a result, the atmospheric moisture content increases and moisture convergence enhances over the North Africa, leading to more precipitation. Later on, when the ocean circulation reaches the quasi-equilibrium (QE), the sea surface temperature (SST) in the North (South) Atlantic decreases (increases). The surface air temperature (SAT) changes synchronously with the SST. This temperature gradient anomaly leads to the moisture transport out of the North Africa, so that the atmospheric moisture content decreases and moisture convergence weakens over the North Africa. Consequently, the precipitation over there decreases. Even so, in the QE stage in the world without TP, the moisture convergence over the North Africa is still much stronger than that in the realistic topography experiment, and the precipitation still increases significantly. This study suggests that the uplift of TP may contribute to the aridification in the North Africa.
    Response of Different Altitude Vegetation to Climate Change in Taibai Mountain Alpine Zone during the Past about 2000 Years
    YANG Xiuyun, GAO Yishen, CHENG Ying, WANG Hongya, LIU Hongyan
    2020, 56(5):  844-854.  DOI: 10.13209/j.0479-8023.2020.053
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    Based on organic geochemical indicators of a lake-sediment profile from Western Foye Chi (3410 m), the study reconstructs the climate change of the Taibai Mountain alpine zone during the past about 2000 years. In order to explore the similarities and differences of vegetation response to the climate change at different altitudes in the alpine zone, pollen analysis of the profile was carried out, and cluster analysis was performed on the results in combination with the published pollen data of Paomaliang (3556 m), Sanqingchi (3080 m) and Fangxiangsi (3000 m) in Taibai Mountain. These analyses suggest that the responses of the vegetation to relatively cold and dry climate have good consistency at different altitudes, which is even more noticeablein the transition zone of timberline. Besides, along with the modern warming period, the responses of vegetation to climate change are mainly determined by the altitude. This study can provide some references for understanding the coupling relationship between climate and vegetation of alpine environmental systems during the Late Holocene.
    Recognition of the Early Paleozoic Wuhuaaobao Forearc Basin and Its Paleogeographic Significance in Sunid Zuoqi, Inner Mongolia
    YAN Linjie, XU Bei, ZHANG Jiaming, WANG Yanyang
    2020, 56(5):  855-866.  DOI: 10.13209/j.0479-8023.2020.061
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    Analysis of sedimentary sequence, material composition and geochronology are used to study a newly discovered epimetarmorphic rock series in Wuhuaaobao area of Sunid Zuoqi, Inner Mongolia, and its paleogeographic significance is also discussed. The epimetarmorphic rock serie is characterized by the interbedded sequence of metavolcanic rock, metasandstone and marble, which contains three cycles and represents an upward-shallowing marine volcanic-sedimentary environment. The presence of multilayer volcanic rocks indicates that they formed during continuous magmatic activity. Zircon U-Pb age of the metavolcanic rock is 454.4±4.1 Ma, which is coincided with the magmatic rock ages of early Paleozoic Bolidao island arc belt in the north. Because the serie is located between the Baolidao arc magmatic belt in the north and the mélange belt in the south, its paleogeographic position should be an early Paleozoic forearc basin. Sequence, composition, age and position characteristics of the Wuhuaaobao epimetarmorphic rock serie reveal the presence of the forearc basin in the study area. Two evolutionary stages of the forearc basin have been suggested during subduction and collision, respectively, according to the early Paleozoic strata, magmatic rocks and metamorphic events.
    Relocation and Focus Mechanism Estimation of the Strong Earthquake Ms≥7.0 from 1918 to 1970 around Asia and Analysis of Their Uncertainties
    HAN Jiayuan, ZHANG Xianbing, ZHOU Shiyong
    2020, 56(5):  867-874.  DOI: 10.13209/j.0479-8023.2020.058
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    Through the software of optical character recognition (OCR), this study sorts out seismic phase report of seismic stations worldwide from 1918 to 1970, earthquake location and focal mechanisms (fault plane solution) of part of the earthquakes are measured in Asia and nearby areas at that time. Specific work is carried out in two aspects. 1) Using arrival time and arrival-time difference in 1918?1970 from International Seismological Summery (ISS) and EHB Bulletin, the relocation of 338 earthquakes are calculated, and 316 among them are reliable. 2) Utilizing P wave initial motion in 1933?1970 from ISS and EHB Bulletin, the focal mechanisms of 244 earthquakes are calculated, and 209 among them are reliable. Based on global seismic network observation, the focal mechanisms of modern strong earthquakes in Asia from 1918 to 1970 have been enriched. Another important significance of this study is to provide a set of feasible methods for the study of modern earthquakes, which can be instructive in other regions or in other magnitudes.
    Evaluating Vitality of Metro Station Service Area with Heat Map: A Case Study on Shenzhen Subway
    ZHOU Yufei, YANG Jiawen, ZHOU Jiangping, ZHOU Peiling, LIU Haitao
    2020, 56(5):  875-883.  DOI: 10.13209/j.0479-8023.2020.054
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    Taking Shenzhen subway as an example, we use Baidu Heat Map to construct a system to evaluate vitality of station service area through heat average and heat coefficient of variation. Station service area, which accounts for 15% of Shenzhen municipal area, has 38%~50% of the city population from 7:00 to 23:00, less population gather at night and more during daytime. The 166 service areas can be classified into four groups: lowbalance mature areas, low-balance developing areas, high-balance mature areas and high-balance developing areas. Their vitality characteristics are quite relevant to built environment. Mature areas have higher development density. High-balance areas have higher land use mixture. Station service areas with large-scale urban village are more likely to show high-balance. The evaluation can be beneficial to adopting available strategies for different types of station service area, and shed light on trancit oriented development (TOD) planning and design.
    Future Prediction of Typical Extreme Climatic Indices and Population Exposure to High Temperature in East Asia
    AN Jie, FU Bo, LI Wei, PENG Siyuan, LI Bengang
    2020, 56(5):  884-892.  DOI: 10.13209/j.0479-8023.2020.071
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    Based on the Earth System Model, greenhouse gas emissions and atmospheric composition of CMIP6 and population data, the correlation between the change of regional mean temperature and extreme climatic indices was studied. Three climatic indices over East Asia under nine SSPs-RCPs scenarios were predicted, and the variation and attribution of population exposure to high temperature were analyzed. The results indicate that 1) there is a robust correlation between the change of global mean temperature and regional extreme climatic indices, which can be used to predict the latter in the future. 2) East Asia will experience increasing risk of extreme climate event in the future decades under SSP2-4.5, SSP4-6.0, SSP3-LowNTCF, SSP3-7.0-Baseline and SSP5-8.5-Baseline scenarios. But taking mitigation measures in advance could reduce such risk significantly. 3) Future population exposure to high temperature of three typical regions of East Asia, which is affected by both climate and population factors, changes dynamically over time and regions. Under most scenarios, the effects of climate and population factors are gradually weakening and strengthening, respectively. The population exposure to high temperature of Southern China is significantly higher than that of Southwest and Central China, and the relative contribution of climate factors is also higher than that of these two regions. 
    Spatial and Temporal Evolution of Construction Land Use Intensity and Its Driving Mechanism in China
    ZHANG Yibin, HUANG An, ZU Jian, LIU Chao, SHI Yunyang, HAO Jinmin
    2020, 56(5):  893-906.  DOI: 10.13209/j.0479-8023.2019.122
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    Taking the cut-off years of China’s four five-year development strategies as the research time point, based on the radial function (RBF) neural network model, China’s 337 municipal administrative units (except Hong Kong, Macao and Taiwan) construction land utilization strength in 2000, 2005, 2010 and 2015 was measured, and the exploratory spatial data analysis model (ESDA) was used to analyze its spatial and temporal evolution pattern. The main driving factors of spatiotemporal differentiation of construction land use intensity in China were analyzed by using geographically weighted regression model (GWR). The results show that from 2000 to 2015, China’s construction land use intensity showed an overall upward trend, and the spatial difference was significant. The high-intensity utilization level was mainly concentrated in the Bohai Rim Economic Zone, major coastal cities and provincial capital cities. The intensity of china’s construction land utilization presented spatial self-correlation, and the global pattern of separation was basically consistent with the pattern of cold hot spot distribution and spatial heterogeneity. The spatial pattern evolution of China's construction land use intensity was mainly affected by four factors: economic development level, industrial structure, urbanization level and government economic regulation. The rank of its influence degree was urbanization level < industrial structure < level of economic development < government economic regulation.
    Investigation on Biofilm-Forming Characteristics of the Nitrogenous Heterocyclic Compound-Degrading Bacteria in a Flow Cell System
    XIONG Fuzhong, ZHANG Nan, WEN Donghui, LI Qilin
    2020, 56(5):  907-916.  DOI: 10.13209/j.0479-8023.2020.060
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    The flow cell system and confocal laser scanning microscopy were applied to investigate the characteristics of biofilm formed by the nitrogenous heterocyclic compound (NHC)-degrading bacteria under different environmental conditions. The results showed that increasing the initial inoculum density and prolonging the initial attachment time were beneficial to the adhesion and biofilm formation of the NHC-degrading bacteria on the surface of the substrate. When the flow rate of the medium was reduced, the biofilm became more homogeneous and formed more water channel structures. Moreover, the biofilm under different conditions presented a same phenomenon that the inner layer (near the surface) had a low ratio of living cells and the outer layer (distant from the surface) had a high ratio of living cells. Compared with the single-strain biofilm, the dual-strain biofilm had an advantage in thickness, surface coverage ratio and living cell ratio. The target NHC concentration also had a significant effect on the morphology and cell viability of the quinoline-degrading bacteria biofilm: at lower concentration of quinoline, the bacteria formed large and developed aggregates; while at higher concentration, the bacterial aggregates became much smaller and evenly dispersive. Besides, the ratio of living cells of the biofilm formed at lower concentration was remarkably higher than that at higher concentration.
    GAP Analysis Based on the Distribution and Fishing Pressure of Threatened Marine Fishes in China
    CHEN Hangtong, YAO Jinxian, BU Sihan, ZHU Zhengguang
    2020, 56(5):  917-930.  DOI: 10.13209/j.0479-8023.2020.067
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    Species distribution hotspots and threatened patterns of 86 threatened marine fishes in China seas were show by using GIS analyses. The species information was refined from multiple source (such as IUCN, OBIS, GBIF, etc.) and literature database. Then, the species abundance layers were compared with the vulnerability index weighted abundance layers to explore the threatened hotspots by fishing. Moreover, based on the threatened marine fishes distribution, fishing hotspots and information of existing protected area, GAP analyses were carried out. The results indicate that 1) the hotspots of 86 threatened marine fishes include the Taiwan Strait, sea areas of southern Fujian, eastern waters of Taiwan, sea areas of eastern Guangdong and sea areas of Pearl River estuary, and the total area is 231000 km2 (accounts for 7.7% China’s sea area); 2) China’s marine protected areas account for only 2.3% of the hotspots, and their coverage needs to be strengthened; 3) The coastal areas of Zhejiang are the most serious threatened habitat by fishing for threatened marine fishes in China. 4) Combining the data extracted from Global Fishing Watch, the results show that in the fishing season, China’s fishing intensity is reduced by more than 80% due to fish-free policy, but the fishing pressure is still huge.
    Improving Air Quality Forecast Accuracy in Urumqi-Changji-Shihezi Region Using an Ensemble Deep Learning Approach
    ZHANG Bin, LÜ Baolei, WANG Xinlu, ZHANG Wenxian, HU Yongtao
    2020, 56(5):  931-938.  DOI: 10.13209/j.0479-8023.2020.070
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    A post-correction framework based on raw forecasts from the numerical air quality model CMAQ is implemented in the Urumqi-Changji-Shihezi region of Xinjiang Autonomous Region to achieve better forecasting performance of PM2.5. An ensemble deep learning method is used to correct the error of original forecasts of CMAQ. The method integrates four machine learning models: deep neural network model, random forest model, gradient boosting model and generalized linear model. In each model, the original meteorological forecasts, air quality forecasts and land use types are used as input data. With the independent evaluation data in 2018, the accuracy of the “bias-corrected” forecasts is significantly improved. The R2 values of the 5-day forecast is 0.41–0.60, which are improved from the original forecasts by 60%–160%, while the RMSE values are reduced by ~40%. As for the cross evaluation, the R2 values of post-corrected results increase by 50%–80%, while RMSE values are reduced by ~30%. The post-correction method is computationally efficient and can be deployed operationally for reliable daily forecasting.
    Spatial-temporal Change and Land Use Analysis of Beijing Urban Heat Island Based on Hourly Temperature Data
    ZHOU Xiaokang, LI Jing, ZHAO Xinyi
    2020, 56(5):  939-949.  DOI: 10.13209/j.0479-8023.2020.068
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    Based on the hourly meteorological datasets from Beijing, China Automatic Weather Stations in 2016, selecting Oct. 23 as the research period without the influence of precipitation and wind, we generated 24 continuous temperature surfaces through ANUSPLIN interpolation software and defined the UHI (urban heat island) using percentile method. The 24-hour moving path and distribution pattern of UHI were analyzed. The relationship was discussed between the diurnal variations of the UHI and the percentage structure of land cover in Beijing. The results show that, 1) there is a diurnal variation of UHI intensity in autumn sunny days in Beijing, and the maximum growth rate is 0.48oC/h at 18:00–23:00. 2) There are three classifications of UHI’s horizontal distribution: single-center UHI, multi-center UHI and radial UHI. 3) The proportion of six types of land use is different in the hourly UHI. In the day, there is no representative land use type in the hourly UHI, and the percentage structure of the six types of land use in the hourly UHI is different. At night, the main land use type in the hourly UHI is built-up land, and the percentage structure of the six types of land use in the hourly UHI is similar. 4) The relationship between the hourly change of UHI and land use type: from 0:00 to 3:00, the area of the hourly moving region of UHI where the proportion of six land use types did not change significantly is small; from 3:00 to 7:00, the UHI moves to the region where the proportion of built-up land decreases and the proportion of forest land increases; from 7:00 to 9:00, the UHI moves to the region where the proportion of forest land decreases and the proportion of built-up land and crop land decreases; from 9:00 to 15:00, the UHI moves to the region where the proportion of built-up land decreases and the proportion of crop land increases; from 15:00 to 19:00, the UHI returnes to the region where the proportion of built-up land increases; from 19:00 to 22:00, the proportion of six land use types in the hourly UHI’s moving region does not change significantly; from 22:00 to 23:00, the UHI moves to the area where the proportion of crop land increases and the proportion of built-up land decreases.
    Basic Supply Service Model of Beijing-Tianjin-Hebei Region Based on LUCC-ESs Matrix
    LI Xiaojing, GAO Yang, LI Shuangcheng
    2020, 56(5):  950-958.  DOI: 10.13209/j.0479-8023.2020.064
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    As the traditional ecosystem service evaluation methods have the disadvantageous as high subjectivity and low comparability, a LUCC-ESs matrix evaluation method is improved. Based on the land use/cover types, the proposed method calculates the ecosystem service units, then builds the LUCC-ESs matrix to evaluate the ecosystem services. This method can avoid different outcomes obtained by different calculation methods, and make these test results comparable and practical. The application of the basic supply service in the Beijing-Tianjin-Hebei region indicates that the spatial pattern of the basic supply services is regional and highly connected with resource reserves and land productivities. The spatial pattern of the demand service appears the same movement and aggregation characteristics as that of the population, which decreases from the city center to suburban. The basic services both inside and outside Beijing-Tianjin-Hebei region converge to the urban center. 
    Impact of Urban Renewal Mode on Commercial Housing Price under Inventory Development: An Empirical Analysis in Shenzhen
    SI Nan, ZHU Yong, YIN Jie
    2020, 56(5):  959-965.  DOI: 10.13209/j.0479-8023.2020.073
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    This paper focuses on the urban commercial housing market and tries to explain the impact mechanism of urban renewal on the price of commercial housing by deducing the bidding rent model. Taking Shenzhen as the research object, multiple regression analysis is used to empirically study the influencing factors and changing rules of housing prices. The results are as follows. 1) Different land development modes will lead to price differences of commercial housing. 2) Compared with the land transfer mode, urban renewal will reduce the price of commercial housing and restrain the impact of housing location change on the price. 3) Urban renewal mode will reconstruct the spatial differentiation of urban commercial housing.
    Effects of Decabrominated Diphenylether-209 on Cell Proliferation and Cell Apoptosis in Human Liver L-02 Cells
    ZHU Tingting, LU Yongfen, QI Xiujuan, HUANG Yi, MENG Haitao, YIN Donggao, SUN Taotao, DENG Chen, WU Desheng
    2020, 56(5):  966-970.  DOI: 10.13209/j.0479-8023.2020.059
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    The effects of BDE-209 (decabrominated diphenylether-209) on the proliferation and apoptosis of human normal liver L-02 cells were analyzed by CCK-8 and Hoechst 33342/PI methods. The results showed that the inhibition rate of cell proliferation increased with the increase of BDE-209 concentration after 24 hours exposure at different concentration levels (0–70 μg/mL). The IC50 of BDE-209 on human normal L-02 cells for 24 hours was 127.08±24.93 μg/mL, which was analyzed by SPSS-Probit-Logit method. After 24 hours exposure to BDE-209 at different concentration levels (0–15 μg/mL), there was no significant change in cell morphology in each dose group compared with the control group, and only cell reduction was observed in the 15 μg/mL dose group. After apoptotic staining, fluorescence microscopy showed that the number of cells stained with brilliant blue and light powder increased with the increase of BDE-209 concentration, and the apoptosis rate of human normal liver L-02 cells increased with the increase of BDE-209 concentration. Compared with the control group, the difference of each dose group was statistically significant. The results showed that BDE-209 could inhibit the proliferation of human normal liver L-02 cells and increase the apoptotic rate.
    Consistency Evaluation of Regional Ecological Carrying Capacity and Industrial Layout Based on Spatial Grid
    LU Wentao, FU Zhenghui, GUO Huaicheng, LÜ Hongdi, YU Lei
    2020, 56(5):  971-974.  DOI: 10.13209/j.0479-8023.2020.072
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    Based on the spatial grid of the kilometer scale, the basic evaluation unit is constructed. The consistency evaluation of regional ecological carrying capacity and industrial layout are carried out. The Qingpu District of Shanghai is used as a research case. The results show that proposed method can effectively identify the regional ecological carrying capacity and the spatial distribution of industrial pressure, and evaluate the consistency of the regional ecological carrying capacity and industrial layout. The average industrial pressure index of Qingpu District is 0.51, and the ecological carrying capacity index is 0.25. The ecological carrying capacity of Qingpu district has a high consistency with the industrial layout, and the average consistency index is 3.12.