On the form of a bus service frequency supply function

Poor service adherence to the scheduled timetable and less service frequency during peak hours have contributed to unreliable shuttle bus services in International Islamic University Malaysia. As a result, students use either private vehicles or walk on-campus rather than riding the shuttle buses. This paper analyse travel time and passenger ridership of shuttle bus services from field surveys on journey time, running time, dwell time and passenger volume along Mahallah Ruqayyah and Mahallah Salahuddin shuttle bus routes. One of the key results on travel time indicates poor service adherence by bus service providers. In terms of passenger ridership, there was a huge gap between Mahallah Ruqayyah and Mahallah Salahuddin route where Mahallah Salahuddin has recorded a low passenger ridership even during peak hours. The findings also show that the service frequency of shuttle bus during peak hours cannot accommodate all students and therefore students either walk or use private vehicles to commute within campus area. Recommendations on the improvement of shuttle bus services are also discussed in this paper.

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SERVICE FREQUENCY AND SERVICE HOURS EVALUATION FOR BUS SERVICE IN WEST KLANG VALLEY

IOP Conference Series Materials Science and Engineering ◽

10.1088/1757-899x/636/1/012008 ◽

2019 ◽

Vol 636 ◽

pp. 012008

Author(s):

Shuhairy Norhisham ◽

Muhammad Fadhlullah Abu Bakar ◽

Zainul Hazwani Abd Samad ◽

Agusril Syamsir ◽

Nur’atiah Zaini ◽

...

Keyword(s):

Klang Valley ◽

Service Frequency ◽

Bus Service

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Retrieval and Evaluation of Chlorophyll-a Concentration in Reservoirs with Main Water Supply Function in Beijing, China, Based on Landsat Satellite Images

International Journal of Environmental Research and Public Health ◽

10.3390/ijerph18094419 ◽

2021 ◽

Vol 18 (9) ◽

pp. 4419

Author(s):

Yuequn Lai ◽

Jing Zhang ◽

Yongyu Song ◽

Zhaoning Gong

Keyword(s):

Remote Sensing ◽

Water Supply ◽

Chlorophyll A ◽

Phosphorus Concentration ◽

Landsat 8 ◽

Supply Function ◽

Estimation Model ◽

Nitrogen And Phosphorus ◽

Chlorophyll A Concentration ◽

Guanting Reservoir

Remote sensing retrieval is an important technology for studying water eutrophication. In this study, Guanting Reservoir with the main water supply function of Beijing was selected as the research object. Based on the measured data in 2016, 2017, and 2019, and Landsat-8 remote sensing images, the concentration and distribution of chlorophyll-a in the Guanting Reservoir were inversed. We analyzed the changes in chlorophyll-a concentration of the reservoir in Beijing and the reasons and effects. Although the concentration of chlorophyll-a in the Guanting Reservoir decreased gradually, it may still increase. The amount and stability of water storage, chlorophyll-a concentration of the supply water, and nitrogen and phosphorus concentration change are important factors affecting the chlorophyll-a concentration of the reservoir. We also found a strong correlation between the pixel values of adjacent reservoirs in the same image, so the chlorophyll-a estimation model can be applied to each other.

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