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This paper addresses the target coverage problem in wireless sensor networks with adjustable sensing range. Communication and sensing consume energy, therefore efficient power management can extend network lifetime. In this paper, we consider a large number of sensors with adjustable sensing range that are randomly deployed to monitor a number of targets.(More)
The sulfur content of diesel fuel is of environmental concern because sulfur can facilitate the formation of diesel particulate matter (DPM) and sulfur dioxide (SO2) in the exhaust can poison catalytic converters. The US Environmental Protection Agency (EPA) has established more stringent regulations to reduce the sulfur content of diesel fuels in the near(More)
This paper addresses the target coverage problem in wireless sensor networks with adjustable sensing range. Communication and sensing consume energy, therefore efficient power management can extend network lifetime. In this paper, we consider a large number of sensors with adjustable sensing range that are randomly deployed to monitor a number of targets.(More)
Carpooling has long held the promise of reducing gas consumption by decreasing mileage to deliver co-riders. Although <i>ad hoc</i> carpools already exist in the real world through private arrangements, little research on the topic has been done. In this paper, we present the first systematic work to design, implement, and evaluate a carpool service, called(More)
A major concern in wireless sensor networks is to maximize network lifetime (in terms of rounds) while maintaining a high quality of services (QoS) at each round such as target coverage and network connectivity. Due to the power scarcity of sensors, a mechanism that can efficiently utilize energy has a great impact on extending network lifetime. Most(More)
Recently, opportunistic routing (OR) has been widely used to compensate for the low packet delivery ratio of multi-hop wireless networks. Previous works either provide heuristic solutions without optimality analysis, or assume that unlimited retransmission is available for delivering a data packet. In this paper, we apply OR to a utility-based routing where(More)
Esterification pretreatment of free fatty acid in biodiesel production, from laboratory to industry" (2014). a b s t r a c t a r t i c l e i n f o Keywords: Acid-catalyzed esterification Biodiesel Used cooking oil Free fatty acid Methanol to FFA ratio Optimization In the US, biodiesel producers usually follow the 19.8:1 methanol-to-FFA molar ratio for free(More)
Traditional utility-based data-gathering models consider the maximiza-tion of the gathered information and the minimization of energy consumption in WSNs with reliable channels. In this paper, we extend the model to include re-transmissions caused by link failure to improve network utility. The challenge lies in balancing two competing factors: energy loss(More)
In this study, experiments were performed with a bench-scale tube-type wet electrostatic precipitator (wESPs) to investigate its effectiveness for the removal of mass- and number-based diesel particulate matter (DPM), hydrocarbons (HCs), carbon monoxide (CO), and oxides of nitrogen (NOx) from diesel exhaust emissions. The concentration of ozone (O3) present(More)