Of the 13 locations categorised as air pollution hotspots based on PM10 and PM2.5 annual averages [44], most fall in Delhi 1 and Delhi 2. It is therefore not surprising that the lockdown led to the maximum improvements in air pollution in these parts of the city. Further, in Delhi 1...
In 2020, New Delhi's average annual concentration of PM2.5 in a cubic meter of air was 84.1, the study said, more than double the level of Beijing, which averaged 37.5 during the year, making it the 14th most polluted city in the world. Air pollution caused an ...
【参考译文】达美航空是美国的主要航空公司之一,也是一家传统航空公司,总部位于乔治亚州亚特兰大。作为美国运营历史最悠久的航空公司,以及全球第六古老的运营航空公司,达美航空及其子公司和地区合作伙伴,包括 Delta Connection,每日运营超过 5,400 班次航班,服务于六大洲 52 个国家的 325 个目的地。Delta 是天合联盟的...
The design of air-conditioning systems takes many circumstances into consideration. A self-contained unit, described above, serves a space directly. More complex systems, as in tall buildings, use ducts to deliver cooled air. In theinduction system, air is cooled once at a central plant and th...
A well-known example is the occurrence of high concentrations of dust over the Beijing area, due to transport of dust generated during storms over deserts in the north and west of China [3,4]. Large-scale weather systems, such as the East Asia summer monsoon [13] and the Siberian High ...
Aircraft have been a fundamental part of military power since the mid-20th century. Generally speaking, all military aircraft fall into one of the following categories:fighters, which secure control of essential airspaces by driving off or destroying enemy aircraft;bombers, which are larger, heavier...
Previous studies shed some light about which options are the most likely to deliver the best results when teaching is the ultimate goal of the game. In the study presented in [12], students showed higher rates of participation in classes after playing cooperative games, when compared to after ...
This air conditioner guide will help you decide on the best air conditioner for your home. You will learn about your different cooling options, how an AC works, whether you should rent or buy, how to maintain your air conditioning system, what to do if y
Just last year, the American Society of Heating, Refrigerating and Air-Conditioning Engineers (ASHRAE) updated their energy code standards to allow air curtains as a replacement an alternative for vestibules. Despite the fact that businesses across the country can now avoid the expensive cost of ve...
this is related to the approach used by EDGAR to spatially allocate the total national emissions. Because of the domestic sector’s contribution to the EDGAR inventory, it provides the highest total emissions during the winter when coal-burning is used for domestic heating. The industrial sector’...