Activated carbon produced from agricultural products and wastes has been applied widely to remove pollutants in the field of waste water treatment.

Saving energy is an important issue in IEEE 802.16e Broadband Wireless Access (BWA) networks. Sleep-mode operation in the IEEE 802.16e effectively saves energy consumption in order to extend life time of a Mobile Subscribe Station (MSS). However, frame response delay is another important performance metric. The constraint is that the sleep-mode operation can reduce consumed energy, but it must guarantee reasonable frame response delay. In this paper, we evaluate in details the effects of maximum sleep interval on energy consumption and on frame response delay of MSS in the sleep-mode operation. Furthermore, we propose a Delay Constraint Energy Saving (DCES) algorithm to quickly determine maximum sleep interval which minimizes energy consumption with frame response delay constraint. The validation of DCES algorithm suggests that the algorithm can provide a potential guidance to energy saving.

The research studies on the typical context of Chi Thien village, an area having new- operated coal-power plant as the development project in the northern part of Vietnam. As the focus of the research, domestic water supply is studied. Conventionally, villagers harvest rainwater into big reservoirs that later on were demolished for house renovation after the agricultural compensation for the coal plant construction. Since the establishment of the Thai Binh 1 Thermal plant, locals are recommended not to drink raining water because of potential negative impacts of coal ash on human health. Findings of the research indicate that local households have been provided with tap water service since 2014 by the Chieu River water plant of the local authority. However, doubts on the low tap water quality and its unstable frequency, rainwater returns to be the preferable choice for their domestic water supply. There is a regular check on water affirmed by the engineer from Chieu River plant. Nevertheless, for confidentiality, it was not allowed to publish regardless of the request to have evidence on qualified tap water. This is considered as the violation of the right to information and the participation in environmental decision making of the villagers. For certain disadvantages of water situation, local people have adaptation by buying reverse osmosis(RO)water filters(wealthier family only)and need to pay for water consumption expense with the low quality received. Study on domestic water is a study on human well-being, human rights and state obligation to ensure the water sanitation, the accessibility, and affordability to people. The role of the Vietnamese government is analyzed in addressing these potential impacts caused by the coal plant project towards an adequate standard of living and the highest attainable standard of health in Chi Thien. The thesis is social research using qualitative research methodology of in-depth interviews and referral samples to approach the topic and elicit reliable information, particularly on opinions and hands-on experiences of villagers.

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We improved common metamaterial perfect absorber (MPA) by integrating four embedded inductors or replacing four embedded capacitors in the same compact structure. The obtained results confirmed that the lumped-capacitors MPA maintains an extreme thickness t = λ/940, where λ is operating wavelength at 106.3 MHz. Besides, by replacing these capacitors by inductors in the initial designed-MPA structure, we obtained an effective thickness of t = λ/53 at 1.9 GHz. Furthermore, we explained the absorption mechanism in terms of the magnetic energy and power loss distributions related to the impedance-matching effect.