Environmental capacity of nitrogen and phosphorus pollutions in Jiaozhou Bay, China: modeling and assessing   总被引：2，自引：0，他引：2  

Han H  Li K  Wang X  Shi X  Qiao X  Liu J 《Marine pollution bulletin》2011,63(5-12):262-266

In recent years, with the development of society and economy of Qingdao, environment and ecosystem problems, for instance, red ties, become more and more serious in Jiaozhou Bay, China, because of the increasing pollutants discharged into it. In order to solve these problems, an eco-hydrodynamic model is constructed to estimate the marine environmental capacity of nitrogen and phosphorus nutrients in Jiaozhou Bay, whose simulation results are rational for the bay. According to the model, if the target is set to achieve water quality (grade II) in Jiaozhou Bay, the environmental capacity of dissolved inorganic nitrogen and phosphorus in one year are approximately 7800 and 840 tons, respectively. Thus our research offers necessary scientific foundation to the total loads control efforts in this area.  相似文献   

Concentration of trace elements and their sources in a snow pit from Yuzhu Peak, north-east Qinghai-Tibetan Plateau     

YueFang Li  XiaoLan Shi  NingLian Wang  JianChen Pu  TanDong Yao 《寒旱区科学》2011,3(3):0216-0222

In order to understand the potential influence of pollution from human activity on the natural cycle of trace elements in the atmosphere over the eastern Kunlun mountains, north-eastern part of the Qinghai-Tibetan Plateau, concentrations of Al, Fe, Ba, Cd, Co, Cr, Cu, Li, Ni, Zn, Pb, Sb, Sr, U and V in a 75 cm-deep snow pit recovered from 5,800 m a.s.l. of the Yuzhu Peak Glacier on October 25, 2009, were determined by a sector field inductively coupled plasma mass spectrometry. The results indicate that concentrations of the measured trace elements vary by orders of magnitude from one element to another ranging from the minimum value 1.2 pg/g (U) to the maximum value 293 ng/g (Fe); the value of Max/Min ranges from 7 pg/g (Sd) to 358 pg/g (Li). EFc values of measured trace elements show that there are other important sources except dust for Cd, Sb, Zn, Pb and Cu. Comparison of the concentrations of the measured trace elements with those in other areas in the Tibetan Plateau indicates that trace element concentrations for Yuzhu Peak are lower than those in east Tianshan and Muztagh Ata (Pamirs). Concentrations of some trace elements are also lower than those in East Rongbuk Glacier. However, concentrations of all measured trace elements are extensively higher than those in Greenland and the Antarctic.  相似文献   

Nuclear Starburst Activity in the Seyfert 2 Galaxy NGC 2273     

Qiu-Sheng Gu  Lei Shi  Shi-Jun Lei  Wen-Hao Liu  Jie-Hao Huang Department of Astronomy  Nanjing University  Nanjing  qsgu@nju.edu.cn 《中国天文和天体物理学报》2003,3(3):203-211

We present spectrophotometric results of the Seyfert 2 galaxy NGC 2273. The presence of high-order Balmer absorption lines (H8, H9, H10) and weak equivalent widths of Call K A3933, CN A4200, G-band A4300 and MgIb 5173 clearly indicate recent star-forming activity in the nuclear region. Using a simple stellar population synthesis model, we find that for the best fit, the contributions of a power-law featureless continuum, an intermediate-age (~ 108 yr) and an old (> 109yr) stellar population to the total light at the reference normalization wavelength are 10.0%, 33.4% and 56.6%, respectively. The existence of recent starburst activity is also consistent with its high far-infrared luminosity (log LFIR/L = 9.9), its infrared color indexes [a(25,60) = -1.81 and a(60,100) = -0.79, typical values for Seyfert galaxies with circumnuclear starburst], and its q-value (2.23, ratio of infrared to radio flux, very similar to that of normal spirals and starburst galaxies). Byrd et al. have suggested that NGC 2273 mig  相似文献   

The lower crust and Moho structures in the southern Lhasa terrane--revealed from near-vertical reflection of the large dynamite shots     

Zhuoxuan Shi  Wenhui Li  Hongqiang Li  Xiaoyu Guo  Rui Gao 《《地质学报》英文版》2018,92(Z1):80-81

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Distribution characteristics of wave energy in the Zhe-Min coastal area     

Qin Ye  Zhongliang Yang  Min Bao  Weiyong Shi  Hongyuan Shi  Zaijin You  Wenyan Zhang 《海洋学报(英文版)》2022,41(5):163-172

A 10-year（2003–2012） hindcast was conducted to study the wave field in the Zhe-Min coastal area（Key Area OE-W2） located off Zhejiang and Fujian provinces of China. Forced by the wind field from a weather research and forecasting model（WRF）, high-resolution wave modelling using the SWAN was carried out in the study area. The simulated wave fields show a good agreement with observations. Using the simulation results, we conducted statistical analysis of wave power density in terms of spatial distr...  相似文献   

Model updating of a bridge structure using vibration test data based on GMPSO and BPNN: case study     

Xia Zhiyuan  Li Aiqun  Shi Huiyuan  Li Jianhui 《地震工程与工程振动(英文版)》2021,20(1)

Model updating issues with high-dimensional and strong-nonlinear optimization processes are still unsolved by most optimization methods.In this study,a hybrid methodology that combines the Gaussian-white-noise-mutation particle swarm optimization(GMPSO),back-propagation neural network(BPNN)and Latin hypercube sampling(LHS)technique is proposed.In this approach,as a meta-heuristic algorithm with the least modification to the standard PSO,GMPSO simultaneously offers convenient programming and good performance in optimization.The BPNN with LHS establishes the meta-models for FEM to accelerate efficiency during the updating process.A case study of the model updating of an actual bridge with no distribution but bounded parameters was carried out using this methodology with two different objective functions.One considers only the frequencies of the main girder and the other considers both the frequencies and vertical displacements of typical points.The updating results show that the methodology is a sound approach to solve an actual complex bridge structure and offers good agreement in the frequencies and mode shapes of the updated model and test data.Based on the shape comparison of the main girder at the finished state with different objective functions,it is emphasized that both the dynamic and static responses should be taken into consideration during the model updating process.  相似文献   

Distribution and sources of organochlorine pesticides in sediments of the coastal East China Sea     

Lin T  Hu L  Shi X  Li Y  Guo Z  Zhang G 《Marine pollution bulletin》2012,64(8):1549-1555

Forty-two surface sediment samples collected from the southern coastal East China Sea (ECS) were analyzed for organochlorine pesticides (OCPs). The results showed high concentrations of DDTs and parent DDT fractions in the nearshore area, suggesting that there is still a fresh input of these species from non-point sources, probably due to the recent usage of relevant products. However, for HCHs, the high concentrations with elevated β-HCH fraction were focused at the local major river estuaries, indicating that soils-released HCH input was mainly from the major river runoffs. The distribution and composition of OCPs in the coastal ECS could be more prominently controlled by the direct regional inputs rather than the general natural sorption process on particulate organic carbon. DDTs and chlordane are more important for their potential ecotoxicological risk on neighboring benthic community in the nearshore region and the local major river estuaries.  相似文献   

Estimation of Summer Rainfall over an Arid Area using AMSR-E Measurements: A Case Study in Xinjiang, China     

Jun Wen  Lei Wang  Wen Yang  Hui Tian  Tangtang Zhang  Xiaokang Shi  Xiehui Li  Yizhou Zhao  Yuan’an Jiang  Yuanpeng Li 《寒旱区科学》2008,(1):0092-0104

Rainfall estimate in arid region using passive microwave remote sensing techniques has been a complex issue for some time.The main reason for this difficulty is that the high and variable emissivity of land surfaces greatly aggravates the complexity of the signatures from the rain cloud.The Xinjiang area,located in the northwest of China,holds all the typical characteristics of arid climate.A rainfall algorithm has been developed for this region by using the Advanced Microwave Scanning Radiometer for Earth Observing System(AMSR-E) measurements.The algorithm attempts to use all 12 chan-nels on the AMSR-E instrument and a two-step method calibrated over 11 days of hourly rain-gauge data.First,Stepwise Discriminant Analysis(SDA) used to optimally estimate rain pixels based on all 12 channels,although only three channels were found to be necessary.Next,a rain predicator scattering index was used to estimate rain rates.A linear relationship between the rain rates and the scattering index above the threshold of 3.0K was constructed with a simple approximately linear function.The estimated rain rates were compared with the rain-gauge data used to calibrate the method,and a good relationship was found with a root-mean-square error of 2.1mm/h.The numerical calculations and comparisons show that the algorithm works well in the Xinjiang area.  相似文献   

The Ophiolitic Mélanges in Strike-slip Fault Zones in West Junggar, Xinjiang, NW China     

GUO Zhaojie  CHEN Shi  ZHANG Yuanyuan 《《地质学报》英文版》2017,91(Z1):13-14

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Statistical Analysis of the Dynamic Parameters of Silty Clay in the Beijing Area     

Shi Chunhu  Lü Yuejun  Peng Yanju  Tang Rongyu 《中国地震研究》2010,24(1):117-127

Soil dynamic parameters, including dynamic shear modulus ratio and damping ratio, have important effects on the results of layered soil earthquake response. In this paper, the mean parameter values of silty clay in different depths are obtained after statistical analysis of the experimental soil dynamic data from 20 recent site seismic safety evaluation reports in the Beijing area. Furthermore, based on two typical engineering sites, the influence of four different soil dynamic parameters, the statistic mean values, experimental values, values recommended by Yuan Xiaoming, and the values recommended in the code for seismic safety evaluation of engineering sites ( DB001 -94) are analyzed. The result shows that mean statistical values are applicable to seismic safety evaluation work in the Beijing area, especially for some inter-layered silty clays whose undisturbed soil samples are hard to obtain.  相似文献