The growing popularity of transport services via ride-hailing apps (RHAs) has posed major debates for transport researchers and planners in many cities worldwide. In Asia, there remains limited information and data about the characteristics of RHA users. This paper investigated the factors affecting users’ utilization rate of RHA services. Zero-Inflated Ordered Probit Model (ZIOPM) was applied with data collected from 1,108 citizens (87.5% aged 1

Plastic bags are used widely across nations and became famous for carrying goods and packing products since 1970 and they start to rapidly popularized in the 20thcentury. People live in Phnom Penh City, the capital city of Cambodia, also use large amount of plastic bags due to various reasons such as their convenience, inexpensive, get free of charge, and easy to get. Plastic bags use has rapidly increased as result of changing life styles, popul

Tonle Sap Biosphere Reserve (TSBR), the largest productive freshwater lake in Southeast Asia regions, is recognized by UNESCO in 1997. TSBR gives a huge benefit to Cambodian, especially for riparian settlement along the lake. The surface area of TSBR changes from 250 000 to 300 000 ha in dry season with the level of water about 1.5m, while in rainy season the area is increased from 1 to 1.3 million ha with the level of water from 8 to 10m. TSBR

Arsenic contamination in groundwater has posed severe health problems to most of countries in the world. Nowadays, many methods of arsenic removal have been studied, but most of these are costly and impractical to be implemented in developing countries such as Cambodia. For this reason, the aim of this study is to determine the optimum concentration of iron supplying for high removal efficiency of As with three different conditions of variation f

Arsenic contamination in groundwater has been recognized as a serious issue for health and environment because arsenic is a hazardous and toxic element; therefore, developing new technology is significant to remove arsenic from groundwater. Technology of arsenic removal has been in place through research to mitigate this problem, including aeration approach, Haix absorbent, precipitation, absorption process, and membrane technology. This study ai

Fiber Reinforced Polymer (FRP) external bonding system is a popular technique that is used to strengthen and repair existing structural elements due to its high strength to weight ratio, fatigue resistance, non-corrosiveness and ease of handling and application at the site. In this research, the focus is on the behavior of FRP external bonding system use to strengthen Reinforced Concrete (RC) beam and column when subjected to be exposed to out-do

Daily rainfall data from six meteorological stations surrounded Tonle Sap Lake was used to analyze a statistical characteristic of rainfall distribution and trend analysis of extreme rainfall for both annual and seasonal. Daily rainfall indices were defined and analyzed based on the World Meteorological Organization guideline. Mann–Kendall’s and Sen’s slope estimator were used to define the statistical significance of the rainfall changes and the

The lakes around Phnom Penh are used as the natural treatments of wastewater before discharging into the river. Thus, the pollutant load in the wastewater concerns the water quality in the natural lakes. This study aims to assess the spatial variation of water quality in Tamouk Lake, which is located in the northern part of Phnom Penh and partly receives the wastewater from Phnom Penh, at the pre- and post-storm events. The Spatio-temporal maps o

Fiber Reinforced Polymer (FRP) is a popular technique that is used to strengthen and repair existing structural elements due to its high strength to weight ratio, fatigue resistance, non-corrosiveness and ease of handling and application at the site. The objective of this research is to study the effect of reinforced concrete (RC) beam and column externally strengthened with glass fiber reinforced polymer (GFRP) sheets after exposing to cyclic we

This work proposes an effective and efficient use of energy supply for a Vertical Take-Off and Landing Unmanned Aerial Vehicle (VTOL UAV). Because of low power consumption, a 2-DOF parallel mechanism is used as dual axis solar tracker, and mounted on a UAV. Then, the UAV becomes a multi rigid-body UAV which has loops of connected links. Dynamic modeling for the system is one of the most challenging engineering problems. To deal with it, kinematic