ติดตาม :        เลือกภาษา THEN 



High contribution of secondary brown carbon to aerosol light absorption in the southeastern margin of Tibetan Plateau

โดย Qiyuan Wang, Yongming Han, Jianhuai Ye, Suixin Liu, ศ.ดร.ศิวัช พงษ์เพียจันทร์* อาจารย์ประจำคณะพัฒนาสังคมและยุทธศาสตร์การบริหาร สถาบันบัณฑิตพัฒนบริหารศาสตร์, Ningning Zhang, Yuemei Han, Jie Tian, Cheng Wu, Xin Long, Qian Zhang, Wenyan Zhang, Zhuzi Zhao, Junji Cao

 

Abstract

          The optical properties of atmospheric secondary brown carbon (BrC) aerosol are poorly understood because of its chemical complexity, and this has hampered quantitative assessments of the impacts of this light-absorbing material on glaciers on the Tibetan Plateau (TP). For this study, a statistical approach was developed to investigate BrC light absorption over the southeastern margin of the TP.

Read more: High contribution of secondary brown carbon to aerosol light absorption in the southeastern margin...

Factors affecting stakeholder’s levels of satisfaction with community partnership association in Rayong Province, Thailand

โดย ศ.ดร.ศิวัช พงษ์เพียจันทร์* อาจารย์ประจำคณะพัฒนาสังคมและยุทธศาสตร์การบริหาร สถาบันบัณฑิตพัฒนบริหารศาสตร์

 

Abstract

          Corporate social responsibility (CSR) studies have investigated the differences among five parameters: gender, age, education, income, and occupation; however, the findings are generally dissimilar. For instance, no comprehensive concordance has been reached on the performance and importance of the differences among those five parameters regarding stakeholder expectations and perceptions of CSR activities.

Read more: Factors affecting stakeholder’s levels of satisfaction with community partnership association in...

Enhanced light absorption due to the mixing state of black carbon in fresh biomass burning emissions

โดย Qiyuan Wanga, Junji Caoa, Yongming Hana, Jie Tian, Yue Zhang, ศ.ดร.ศิวัช พงษ์เพียจันทร์* อาจารย์ประจำคณะพัฒนาสังคมและยุทธศาสตร์การบริหาร สถาบันบัณฑิตพัฒนบริหารศาสตร์, Yonggang Zhang, Li Li, Xinyi Niu, Zhenxing Shen, Zhuzi Zhao, Danai Tipmanee, Suratta Bunsomboonsakul, Yang Chen, Jian Sund

 

Abstract

          A lack of information on the radiative effects of refractory black carbon (rBC) emitted from biomass burning is a significant gap in our understanding of climate change. A custom-made combustion chamber was used to simulate the open burning of crop residues and investigate the impacts of rBC size and mixing state on the particles' optical properties.

Read more: Enhanced light absorption due to the mixing state of black carbon in fresh biomass burning emissions

Effects of day-of-week trends and vehicle types on PM2.5-bounded carbonaceous compositions

โดย ศ.ดร.ศิวัช พงษ์เพียจันทร์* อาจารย์ประจำคณะพัฒนาสังคมและยุทธศาสตร์การบริหาร สถาบันบัณฑิตพัฒนบริหารศาสตร์, Charnwit Kositanont, Jittree Palakun, Suixin Liu, Kin Fai Ho, Junji Cao

 

Abstract

          Carbonaceous compositions of PM2.5 were measured in the heart of Bangkok from 17th November 2010 to 19th January 2012, and a data set of 94 samples was constructed. Effects of day-of-week trends and vehicle types on PM2.5-bound TC, OC, and EC were carefully investigated. In this study, OC was the most important contributor to the total PM2.5 mass concentration.

Read more: Effects of day-of-week trends and vehicle types on PM2.5-bounded carbonaceous compositions

Effect of agricultural waste burning season on PM2.5-bound polycyclic aromatic hydrocarbon (PAH) levels in Northern Thailand

โดย ศ.ดร.ศิวัช พงษ์เพียจันทร์* อาจารย์ประจำคณะพัฒนาสังคมและยุทธศาสตร์การบริหาร สถาบันบัณฑิตพัฒนบริหารศาสตร์, Mattanawadee Hattayanone, Junji Cao

 

Abstract

          Smoke from agricultural waste burning causes hazardous haze pollution in Southeast Asian countries every year. Besides traces of a few toxic gases several persistent organic pollutants, natural, and anthropogenic emissions are released, resulting in adverse health effects. The study focuses on identification of sources of PM2.5-bound polycyclic aromatic hydrocarbons (PAHs) during the non-haze and haze seasons and investigates the concentration and toxicity of fine particulate matter, especially in the middle of biomass burning period.

Read more: Effect of agricultural waste burning season on PM2.5-bound polycyclic aromatic hydrocarbon (PAH)...

Discrimination of the geographical origins of rice based on polycyclic aromatic hydrocarbons

โดย ศ.ดร.ศิวัช พงษ์เพียจันทร์* อาจารย์ประจำคณะพัฒนาสังคมและยุทธศาสตร์การบริหาร สถาบันบัณฑิตพัฒนบริหารศาสตร์

 

Abstract

          Over the past few decades, several techniques have been applied to identify the geographical origins of rice products. In this study, the chemical characterization of polycyclic aromatic hydrocarbons (PAHs) was carefully conducted by analysing PAHs in rice samples collected from private sector planting areas located in Bali and Yogyakarta, Indonesia (i.e. ID; n = 20), west sides of Malaysia (i.e. MY; n = 20), Mandalay, Legend, Myingyan, Myanmar (i.e. MM; n = 20), northern parts of Lao PDR (i.e. LA; n = 20), central parts of Cambodia (i.e. KH; n = 20), northern parts of Vietnam (i.e. VN; n = 20), and Thailand (i.e. TH; n = 22).

Read more: Discrimination of the geographical origins of rice based on polycyclic aromatic hydrocarbons

Contributions of aerosol composition and sources to particulate optical properties in a southern coastal city of China

โดย Jie Tian, Qiyuan Wang, Yongming Han, Jianhuai Ye, Ping Wang, ศ.ดร.ศิวัช พงษ์เพียจันทร์* อาจารย์ประจำคณะพัฒนาสังคมและยุทธศาสตร์การบริหาร สถาบันบัณฑิตพัฒนบริหารศาสตร์, Haiyan Ni, Yaqing Zhou, Meng Wang, Youzhi Zhao, Junji Cao

 

Abstract

          The contributions of chemical composition and emission sources to aerosol optical properties were evaluated for a coastal city in southern China. The average dry light scattering coefficient (bscat ,dry) and light absorption coefficient (babs) were 32.5 ± 15.5 Mm-1 and 8.8 ± 4.7 Mm-1, respectively. Diurnal cycles in bscat ,dry and babs were observed with peak values in the morning and at night. Both bscat ,dry and babs varied with wind speeds and directions, and thus affected by transport pathways.

Read more: Contributions of aerosol composition and sources to particulate optical properties in a southern...

Characteristics of PM2.5 at a High-Altitude Remote Site in the Southeastern Margin of the Tibetan Plateau in Premonsoon Season

โดย Zhuzi Zhao, Qiyuan Wang, Li Li, Yongming Han, Zhaolian Ye, ศ.ดร.ศิวัช พงษ์เพียจันทร์* อาจารย์ประจำคณะพัฒนาสังคมและยุทธศาสตร์การบริหาร สถาบันบัณฑิตพัฒนบริหารศาสตร์, Yong Zhang, Suixin Liu, Ruixia Tian and Junji Cao

 

Abstract

          The Tibetan Plateau (TP) is one of the world’s most sensitive areas for climate change. Previous studies have revealed that air pollutants emitted from South and Southeast Asia can be transported to and have a negative impact on the TP. However, the majority of the investigators have focused on the pollutant transport processes from South Asian regions (i.e., India and Bangladesh) and parts of Southeast Asia, while the regions adjacent to the southeast fringe of the TP (i.e., Burma and the Sino-Burmese border) have been neglected.

Read more: Characteristics of PM2.5 at a High-Altitude Remote Site in the Southeastern Margin of the Tibetan...

Assessment of selected metals in the ambient air PM10 in urban sites of Bangkok (Thailand)

โดย ศ.ดร.ศิวัช พงษ์เพียจันทร์* อาจารย์ประจำคณะพัฒนาสังคมและยุทธศาสตร์การบริหาร สถาบันบัณฑิตพัฒนบริหารศาสตร์, Akihiro Iijima

 

Abstract

          Estimating the atmospheric concentrations of PM10-bounded selected metals in urban air is crucial for evaluating adverse health impacts. In the current study, a combination of measurements and multivariate statistical tools was used to investigate the influence of anthropogenic activities on variations in the contents of 18 metals (i.e., Al, Sc, V, Cr, Mn, Fe, Co, Ni, Cu, Zn, As, Se, Cd, Sb, Ba, La, Ce and Pb) in ambient air. The concentrations ofPM10-bounded metals were measured simultaneously at eight air quality observatory sites during a half-year period at heavily trafficked roads and in urban residential zones in Bangkok, Thailand.

Read more: Assessment of selected metals in the ambient air PM10 in urban sites of Bangkok (Thailand)

Assessing human exposure to PM10-bound polycyclic aromatic hydrocarbons during fireworks displays

โดย ศ.ดร.ศิวัช พงษ์เพียจันทร์* อาจารย์ประจำคณะพัฒนาสังคมและยุทธศาสตร์การบริหาร สถาบันบัณฑิตพัฒนบริหารศาสตร์, Mattanawadee Hattayanone, Oramas Suttinun, Chukkapong Khumsup, Itthipon Kittikoon, Phoosak Hirunyatrakul, Junji Cao

 

Abstract

          The “Loy Krathong” festival is a major annual Thai event that includes firework displays. It takes place on the evening of the full moon in the 12th month of the traditional Thai lunar calendar. Since fireworks are widely considered a major source of PAHs, it is considered reasonable to expect a significant increase in PAH levels during this event. The overall PAH profile at the six air quality observatories operated by the Pollution Control Department (PCD), Ministry of Natural Resources and Environment (MNRE), showed that the Kingdom of Thailand's atmosphere was dominated by 5e6-ring PAHs during the firework display period.

Read more: Assessing human exposure to PM10-bound polycyclic aromatic hydrocarbons during fireworks displays