scholarly journals Investigation on the Emission and Diffusion of Hydrogen Sulfide during Landfill Operations: A Case Study in Shenzhen

2021 ◽  
Vol 13 (5) ◽  
pp. 2886
Author(s):  
Haijie He ◽  
Tao Wu ◽  
Hui Xu ◽  
Yuhua Lu ◽  
Zhanhong Qiu ◽  
...  
Keyword(s):  
Hydrogen Sulfide ◽  
Wind Direction ◽  
Simulated Data ◽  
Living Environment ◽  
Surrounding Area ◽  
Monitoring Point ◽  
Wind Speeds ◽  
And Diffusion ◽  
Diffusion Of Hydrogen

This study investigated the emission and diffusion of hydrogen sulfide (H2S), as one of the odorous gases generated from landfills, in a municipal solid waste landfill of a south Chinese city. To this end, the flux of the H2S emissions in the working area of the landfill and its diffusion in the surrounding area were measured. The diffusion of the H2S was simulated at different wind speeds, wind directions, bare working areas of the landfill, heights of the landfill, and angles between the wind direction and the long side of the working area. The results indicated that the concentration of the H2S around the monitoring point ranged from 0 to 60 µg/m3, and the simulated data were consistent with the measured results. At a uniform wind direction, the pollution range of the H2S was narrow. Furthermore, with an increase in the height of the waste dump, the concentration of the H2S decreased in the working area but rose in the surrounding area. Notably, when the angle between the long side of the working area and the wind direction was 0°, the H2S largely spread along the extension cord of the long side of the working area. When the angle increased to 90°, the influence range of the H2S extended significantly. The working area in the landfill site should be regulated based on the monitored data to reduce the effect of this harmful gas on the living environment, and the health of the landfill staff and nearby residents.

The Impact of Assimilating SSM/I and QuikSCAT Satellite Winds on Hurricane Isidore Simulations

2007 ◽  
Vol 135 (2) ◽  
pp. 549-566 ◽  
Author(s):  
Shu-Hua Chen
Keyword(s):  
Wind Speed ◽  
Wind Direction ◽  
Mesoscale Model ◽  
Three Dimensional ◽  
Storm Track ◽  
Initial Position ◽  
Wind Speeds ◽  
The Impact ◽  
Quikscat Winds

Abstract Three observational datasets of Hurricane Isidore (in 2002) were analyzed and compared: the Special Sensor Microwave Imager (SSM/I), the Quick Scatterometer (QuikSCAT) winds, and dropsonde winds. SSM/I and QuikSCAT winds were on average about 1.9 and 0.3 m s−1 stronger, respectively, than dropsonde winds. With more than 20 000 points of data, SSM/I wind speed was about 2.2 m s−1 stronger than QuikSCAT. Comparison of the wind direction observed by QuikSCAT with those from the dropsondes showed that the quality of QuikSCAT data is good. The effect of assimilating SSM/I wind speeds and/or QuikSCAT wind vectors for the analysis of Hurricane Isidore was assessed using the fifth-generation Pennsylvania State University–National Center for Atmospheric Research (PSU–NCAR) Mesoscale Model (MM5) and its three-dimensional variational data assimilation system. For the Hurricane Isidore case study, it was found that the assimilation of either satellite winds strengthened the cyclonic circulation in the analysis. However, the increment of the QuikSCAT wind analysis is more complicated than that from the SSM/I analysis due to the correction of the storm location, a positive result from the assimilation of wind vectors. The increase in low-level wind speeds enhanced the air–sea interaction processes and improved the simulated intensity for Isidore. In addition, the storm structure was better simulated. Assimilation of QuikSCAT wind vectors clearly improved simulation of the storm track, in particular during the later period of the simulation, but lack of information about the wind direction from SSM/I data prevented it from having much of an effect. Assessing the assimilation of QuikSCAT wind speed versus wind vector data confirmed this hypothesis. The track improvement partially resulted from the relocation of the storm’s initial position after assimilation of the wind vectors. For this case study, it was found that the assimilation of SSM/I or QuikSCAT data had the greatest impact on the Hurricane Isidore simulation during the first 2 days.

Open teaching mode of environmental design major in colleges

2021 ◽  
pp. 002072092110052
Author(s):  
Yi Zhang ◽  
Yingjiao Chen
Keyword(s):  
Environmental Design ◽  
Living Environment ◽  
Theory And Practice ◽  
Basic Material ◽  
Chinese People ◽  
Teaching Mode ◽  
Good Living ◽  
Economic Construction ◽  
Considerable Damage

With the acceleration of China's industrialized cities, economic construction and social development have caused considerable damage to the natural environment. Having a good living environment has become an urgent need of the Chinese people, who have already met their basic material needs. This paper mainly adopts the method of combining theoretical analysis with case study. From the perspective of theory and practice, this paper studies the following contents: the present situation of teaching development and reflection on the environmental design specialty in China, the characteristics of open teaching mode, combined with the setting of environmental design specialty curriculum system and the teaching conditions of related specialties in Chinese universities. This study takes the open teaching mode of ordinary colleges and universities as the research object, and takes a university in China as an example to study the open teaching mode.

Adsorption and Diffusion of Hydrogen on C60-Supported Ptn Clusters

2013 ◽  
Vol 117 (19) ◽  
pp. 10059-10069 ◽  
Author(s):  
R. Méndez-Camacho ◽  
R. A. Guirado-López
Keyword(s):  
And Diffusion ◽  
Diffusion Of Hydrogen

Solubility and diffusion of hydrogen in vanadium-oxygen alloys

1988 ◽  
Vol 19 (1) ◽  
pp. 67-72 ◽  
Author(s):  
D. T. Peterson ◽  
B. J. Schlader
Keyword(s):  
And Diffusion ◽  
Diffusion Of Hydrogen
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