Optimization of MSW treatment schemes by fuzzifying mathematics in Yan'an city;

The content of heavy metal Pb,Cr,Cd,Hg in compostable refuse were researched with one-year monitoring in Yan'an city,which could be contrasted to different standard values.

In this paper,the grain safety was analyzed from the aspects of quantity,quality and sustainable development,and a case study was made in the Baota District of Yan an,a hilly and gully area of the Loess Plateau.

Relative Carrying Capacity of Resources and Problems of Sustainable Development in Yan'an City;

Through years' investigation and analysis of ecological environment construction in Yan'an city, this paper discusses water-soil conservation troblem is plateau gullies region.

Preliminary Study on Cultivating and Maintaining Technology of Greenbelt Lawn in Yanan City;

Gray Relational Analysis of Change of Industrial Structure in Yanan City;

It takes the planning of water transfer projects of center zone in Yanan city as an example to analyze its necessity and feasibility from three aspects including social economy,technology process and nature ecological environment,which is better to assess water transfer projects and provides technology support for decision-.

Feasibility Analysis of Area-Connecting District Heating in Yan an City;

Quantificational analysis in ecological water requirement of plant-soil compound ecosystem in Yan an city based on GIS;

Positioning and communicating of city tourism image——a case of Yan an City;