A study on the orbit of air temperature movement

In this paper, we describe an air temperature movement by mapping its time series to the polar coordinates: the value of the time series is plotted on the radial coordinate and the time on the angular coordinate. In this way, both the yearly and daily air temperature movements from five different locations of China are used to demonstrate that, in an intuitionistic view, air temperature movement is neither random nor chaotic, but has its own orbit. We then propose an elliptic orbit model for the air temperature movement. Our proposed model provides quite good results when it is applied to the evaluation of yearly air temperature movements in eight locations in various parts of the world, and the evaluation of daily air temperature movements in five locations in Hunan Province of China on December 17, 2005. Results show that our approach provides a concise and helpful model for air temperature analysis.     

太湖水质氮素质量浓度时空差异特征及影响因素分析

通过对2014—2016年湖体水质中氮素质量浓度分析,结合出入湖总氮浓度、水量、湖体水生生态等影响因素,发现太湖水体中总氮浓度呈现逐年下降的趋势,各监测点位总氮为0.530 mg/L～5.51 mg/L,时空分布不均,差异明显。时间上,总氮浓度表现为春季最高,夏季和秋季最低,且月均值变化曲线呈现出规律的正弦函数波形。空间上,总氮浓度大致表现出由西部湖区向东部湖区递减的趋势,呈现西部湖区﹥北部湖区﹥南部湖区﹥湖心区﹥东部湖区。要改善湖体水质,不仅要切断污染源,而且要加强水生生态功能修复。     

Assessing land use impacts on flood processes in complex terrain by using GIS and modeling approach

A distributed hydrologic modeling and GIS approach is applied for the assessment of land use impact in the Steinsel sub-basin, Alzette, Grand-Duchy of Luxembourg. The assessment focuses on the runoff contributions from different land use classes and the potential impact of land use changes on runoff generation. The results show that the direct runoff from urban areas is dominant for a flood event compared with runoff from other land use areas in this catchment, and tends to increase for small floods and for the dry season floods, whereas the interflow from forested, pasture and agricultural field areas contributes to the recession flow. Significant variations in flood volume, peak discharge, time to the peak, etc., are found from the model simulation based on the three hypothetical land use change scenarios.     

Application of a checklist for quality assistance in environmental modelling to an energy model

Large, complex energy models present considerable challenges to develop and test. Uncertainty assessments of such models provide only partial guidance on the quality of the results. We have developed a model quality assistance checklist to aid in this purpose. The model checklist provides diagnostic output in the form of a set of pitfalls for the model application. The checklist is applied here to an energy model for the problem of assessing energy use and greenhouse gas emissions. Use of the checklist suggests that results on this issue are contingent on a number of assumptions that are highly value-laden. When these assumptions are held fixed, the model is deemed capable of producing moderately robust results of relevance to climate policy over the longer term. Checklist responses also indicate that a number of details critical to policy choices or outcomes on this issue are not captured in the model, and model results should therefore be supplemented with alternative analyses.     

320米塔上测量的湍流统计特征量的初步分析

应用320米塔上第一次获得的垂直风速脉动量的垂直分布资料,根据湍流扩散统计理论并结合半经验近似,讨论由欧拉参数估算边界层下层扩散参数的主要方法,得到了湍流统计特征量K_(?)、σ_w及ε随高度和稳定度变化的经验关系,为北京地区大气扩散规律研究及污染模式的建立提供实验基础.     

Multimedia model of atrazine in plant-soil-groundwater system with a fugacity approach

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环境污染纠纷技术仲裁监测方法探讨

以某铝厂环境空气氟化物污染纠纷的技术仲裁监测为实例，总结出了一套环境污染纠纷技术仲裁监测的工作程序和方法，从法律程序、技术路线、质量保证，监测指标体系等方面对环境污染纠纷技术仲裁监测工作如何开展进行了探讨。     

铬渣的无害化处理和综合利用

铬渣产量大、毒性剧烈 ,是严重污染生态环境和危害人类健康的危险废物。介绍了铬渣各种无害化处理方法的解毒机理、工艺过程和应用实践 ,阐述了对铬渣进行综合利用的途径 ,并就铬渣的防治前景提出了建议。     

硫磺回收装置标定及分析

本文对Ⅱ套SRU的标定结果，进行了比较详细的技术分析，在此基础上，对装置及其运行状况作出了评价，并提出了一些建设。     

浅谈ISO14000环境管理体系标准对推进清洁生产的积极影响

针对ISO14000环境管理体系的特点论述了其对推进清洁生产的积极作用。