Calculate Road Traffic Air Emissions Including Traffic jam: Application over Ho Chi Minh City, Vietnam

Hồ, Quốc Bằng
Road traffic emissions are the main sources of uncertainties in air quality numerical models used to forecast and define abatement strategies. Available models to calculate road traffic emission always require a big effort, money and time. So that in this research we used a model namely EMISENS model for calculation air emission inventories over Ho Chi Minh City (HCMC), Vietnam. However, this model can not calculated air emission inventories in temporal and take into account the traffic jam. The first aim is to improve the calculation method including phenomena of traffic jam and integrated it in the EMISENS model. Then, study scenarios to reduce air pollution caused by road traffic activities for HCMC until 2020. The results shown that when calculating emissions we have to take into account traffic jam. Emissions calculated results taking into account traffic jams shown that motorcycle emissions occupy most emissions of CH4, CO, NMVOC, SO2 and NOx (more than 88%, 85%, 82%, 70 % and 31.5% respectively, of the total emissions from road transport activities in HCMC). The first scenario is the reduction scenario for the year of 2020, its results shown that the emissions of the city will be increased very low (increasing 2-8% from 2012). The current vehicle technology is old and outdated techniques. Therefore, if we want to invest in buses to replace motorcycle, air pollution in HCMC will become aggravates.
Chi tiết xin mời tham khảo tại http://repository.vnu.edu.vn/handle/VNU_123/56683
Title: Calculate Road Traffic Air Emissions Including Traffic jam: Application over Ho Chi Minh City, Vietnam
Authors: Hồ, Quốc Bằng
Keywords: Traffic emissions;Traffic jam;Ho Chi Minh City;EMISENS model;Air Pollution
Issue Date: 2014
Publisher: ĐHQGHN
Series/Report no.: Vol. 30, No. 1 (2014);
Description: p. 12- 21
URI: http://repository.vnu.edu.vn/handle/VNU_123/56683
ISSN: 2588-1094
Appears in Collections:Earth and Environmental Studies

Nhận xét

Đăng nhận xét

Bài đăng phổ biến từ blog này

Xây dựng quy trình định lượng flurbiprofen trong viên nénbao phim 100 mg bằng phương pháp sắc ký lỏng hiệu năng cao ghép đầu dò diode-array

Nguyễn, Thị Thanh Bình Đặng, Ngọc Anh Trần, Mai Anh Nguyễn, Thanh Hải Trong nghiên cứu này chúng tôi đã xây dựng được quy trình định lượng flurbiprofen trong viên nén bao phim 100 mg bằng phương pháp sắc ký lỏng hiệu năng cao ghép đầu dò diode-array theo hướng dẫn của Cơ quan quản lý thuốc châu Âu và Hội nghị quốc tế về hài hoà hoá các yêu cầu kỹ thuật để đăng ký dược phẩm sử dụng trên người. Pha tĩnh được sử dụng là cột silica gel pha đảo C8 (5 μm, 120 Å, 4,6×150 mm), pha động là hỗn hợp acetonitril : nước : acid acetic băng với tỷ lệ 65 : 32,5 : 2,5, tốc độ dòng 1 ml/phút. Mẫu được tiêm với thể tích 10 µl, thời gian sắc ký 8 phút, bước sóng phát hiện 247 nm. Thời gian lưu của flurbiprofen là 3,73 phút. Kết quả thực nghiệm cho thấy trong khoảng nồng độ từ 2 - 20 μg/ml, có sự tương quan tuyến tính chặt chẽ giữa diện tích pic y (mAU.min) và nồng độ dung dịch x (μg/ml) theo phương trình y = 0,680x với hệ số xác định R2 = 0,9993. Giới hạn phát hiện và giới hạn định lượng lần lượt là 0,0...
Đọc thêm

BTEX pollution caused by motorcycles in the megacity of HoChiMinh

Tran, Thi Ngoc Lan Pham, Anh Minh Monitoring of benzene, toluene and xylenes (BTEX) was conducted along with traffic counts at 17 roadside sites in urban areas of HoChiMinh. Toluene was the most abundant substance, followed byp,m-xylenes, benzene,o-xylene and ethylbenzene. The maximum observed hour-average benzene concentration was 254μg/m3 . Motorcycles contributed to 91% of the traffic fleet. High correlations among BTEX species, between BTEX concentrations and the volume of on-road motorcycles, and between inter-species ratios in air and in gasoline indicate the motorcycle-exhaust origin of BTEX species. Daily concentrations of benzene, toluene, ethylbenzene, p,m-xylenes ando-xylene were 56, 121, 21, 64 and 23μg/m3 , respectively. p,m-xylenes possess the highest ozone formation potential among the BTEX family Chi tiết xin mời tham khảo tại http://repository.vnu.edu.vn/handle/VNU_123/32862   Title:  BTEX pollution caused by motorcycles in the megacity of HoChiMinh...
Đọc thêm

Cultural Differences: A Barrier to Native English Teachers in English as a Foreign Language Contexts

Võ, Thị Hoàng Yến When teachers and students come from different cultures, many perplexities can arise. These can be due to different social positions of teachers and students in the two societies, to differences in expected teacher/student and student/student interaction, or to differences in the relevance of the curricula of the two societies (Hofstede). Therefore, it has been assumed that a teacher must be aware of socio-cultural differences to operate effectively in the classroom. This paper begins with cultural aspects of individualist and collectivist countries and influences of collectivist cultures in EFL classrooms. It also shows a number of cultural explanations of communication avoidance in EFL classrooms, especially inChina,JapanandVietnam. Finally, the paper presents some difficulties native speaking teachers encounter when teaching English in EFL contexts and potential solutions to these difficulties. Chi tiết xin mời tham khảo tại http://repository.vnu....
Đọc thêm