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[Preoperative versus postoperative radiotherapy in soft tissue sarcomas: Cutting edge along with perspectives].
To determine the best control technology for dioxin in waste incineration flue gas, a three-level comprehensive evaluation index system with environment, economy, and technology as the first-level indexes was constructed. The fuzzy comprehensive evaluation method and the analytic hierarchy process (AHP) were used to evaluate ten dioxin pollution control technologies or technology groups including "double bag activated carbon adsorption technology," "sulfur and sulfide inhibition technology," and "sulfur and sulfide inhibition technology+activated carbon fixed bed reactor technology". The "sulfur and sulfur compound inhibition technology+activated carbon fixed bed technology" scored the highest, and thus is currently the best control technology for dioxin pollution in waste incineration exhaust gas. This technology is suitable for small rural waste incinerators to ensure that dioxin emissions meet the standards. Depending on the local economic development level, enterprise scale, furnace profile, and technological process, waste incineration enterprises in various regions of China can adopt this index evaluation system and method to evaluate the dioxin control technologies and select the best one suitable for the enterprise so that dioxin emissions in the waste incineration flue gas can be effectively controlled.The ammonia emissions inventory of Zhejiang Province was established in 2017 using the activity data of various ammonia emission sources, emission factors, and an estimation method. Ammonia emissions for each source and city in Zhejiang Province were analyzed. The spatial distribution and intensity of ammonia emissions in 2017 were mapped using ArcGIS software. The total anthropogenic ammonia emissions in Zhejiang Province in 2017 were 122.00 kt. The farmland ecosystem was the major source of total ammonia emissions (36.06 kt), and nitrogen fertilizer applications was the largest contributor in this category (87.12%), followed by the livestock and poultry source (29.44%). The waste and human-activity sources were the two major non-agricultural sources, accounting for 44.07% and 28.49%, respectively. Hangzhou City had the highest ammonia emissions in 2017, accounting for 17.83% of the total ammonia emissions in Zhejiang Province. However, the ammonia emission intensity in Jiaxing City was the highest, reaching 3.82 t ·km-2. The spatial distribution map revealed that ammonia emissions in the northern and southeastern Zhejiang were relatively higher, while ammonia emission intensity was higher in the northern and northeastern region.This study updates a bottom-up high-resolution emission inventory and estimates the concentrations, emission factors, emissions, and performance values of China's power plants, based on the data from continuous emission monitoring systems and environmental statistics in 2018. The results show that the ultra-low emission policy has significant effects the average concentrations of SO2, NO x , and PM in thermal power plants were 37.57, 56.71, and 7.41 mg ·m-3, respectively in 2018, which were 58.71%, 43.12%, and 60.79% lower than those in 2015. The average emission factors of SO2, NO x , and PM from coal-fired units in China were 0.3, 0.48, and 0.06 g ·kg-1, respectively, which were 55.2%, 36.84%, and 62.5% lower than those in 2015. Inaxaplin The total emissions of SO2, NO x , PM, and PM2.5in thermal power plants were 721.4, 1183.8, 149.0, and 135.9 kt ·a-1, respectively, down by 41.32%, 19.29%, 48.12%, and 40.39% from 2015.In recent years, there have been frequent ozone pollution episodes in Dezhou, China. In the summer of 2018 (from June to August), Dezhou experienced serious ozone pollution episodes. The daily 8-hour maximum ozone concentrations exceeded the national standard for 60 days with the standard exceeding ratio of 65%. The average of daily 8-hour maximum ozone concentration was 176 μg ·m-3 over these three months, and the highest value reached was 262 μg ·m-3. In this study, the WRF-CAMx model coupled with the higher-order decoupled direct method (HDDM) was used to analyze the ozone sensitivity and emission control plans in Dezhou during this period. The results showed that ozone formation was in the strong VOC-limited regime in the urban area of Dezhou, while it was in the NO x and VOCs transition regime in suburban areas. VOCs sensitivity values (dO3_V50) were positive every day in summer, which was higher in June (18.7 μg ·m-3 in urban area, 19.7 μg ·m-3 in suburban area) and August (15.3 μg ·m-3 in urban area, 16.4 μg ·m-3 in suburban area) than in July (13.0 μg ·m-3 in urban area, 11.8 μg ·m-3 in suburban area). NO x sensitivity values (dO3_N50) were positive or negative in the urban area, and most days were positive in the suburban area, which were close to the VOCs sensitivity values. For urban areas, VOC reduction should be the priority for emission reduction plans, whereas for suburban areas, NO x ：VOCs=1：1 is recommended because the reductions in NO x and VOCs emissions had the same effect on ozone pollution control.To investigate the seasonal variations in the concentrations of atmospheric volatile organic compounds (VOCs) in the urban area of Chengdu, VOC species were monitored from December 2018 to November 2019, and the concentrations, chemical composition, chemical reactivity, and sources of VOCs were analyzed. Average volume fraction of VOCs in spring, summer, autumn, and winter are 32.29×10-9, 36.25×10-9, 40.92×10-9, and 49.48×10-9, respectively. The concentrations in winter are significantly higher than the winter concentrations measured in other areas. There is no significant difference between VOC concentrations in spring and summer, but component concentrations vary from season to season. In winter, alkanes account for the largest proportion of total VOCs owing to vehicle emissions. The proportion of oxygen (nitrogen)-containing volatile organic compounds in summer and autumn is much higher than that in spring and winter. Volatile emissions from primary sources and secondary conversions have a great contributid winter contribute to 9% of total VOC levels.
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