Global coastal aquatic ecosystems are negatively impacted by the introduction of harmful species through discharge ships’ ballast water. To reduce discharges organisms and pathogens, such as toxic phytoplankton species, ships now transitioning to use water management systems (BWMS) instead exchange (BWE). This study examines abundance diversity in managed BWMS (or a combination both BWE + BWMS)...

The ctenophore Bolinopsis vitrea is first reported from the Turkish and Bulgarian regions of the Black Sea. In Turkish waters, a considerable aggregation was found in Sile on the Asian side and at Kilyos on the European side in 2007. This appears to be the first record of this species in the Black Sea, which is known in the Mediterranean Sea including the Aegean Sea. Bolinopsis vitrea most like...

Railway ballast tamping operation is employed in order to restore the geometry of railway track distorted by train traffics. In this paper, based on analysis of tamping principle, the discrete element analysis model of railway ballast is created using the discrete element method, numerical simulations are performed to study the change of railway ballast compactness during tamping process. This ...

In this paper will be reported the study and implementation of a single stage High Power Factor (HPF) electronic ballast for High Pressure Sodium (HPS) lamps using a LCC filter. In the recent years many authors are working to obtain single stage HPF electronic ballast for fluorescent lamps [1][2]. Normally to obtain HPF in electronic ballast for high pressure sodium lamps a Power Factor Preregu...

An improved topology of a voltage-fed quasi-resonant soft switching LCrCdc series-parallel half bridge inverter with a constant-frequency for electronic ballast applications is proposed in this paper. This new topology introduces a low-cost solution to reduce switching losses and circuit rating to achieve high-efficiency ballast. Switching losses effect on ballast efficiency is discussed throug...

In this paper will be reported the study and implementation of a single stage High Power Factor (HPF) electronic ballast for High Pressure Sodium (HPS) lamps using a Half-Bridge Boost Rectifier integrated with an Electronic Ballast based in a LCC filter. In the recent years many authors are working to obtain single stage HPF electronic ballast for fluorescent lamps [1-3]. Normally to obtain HPF...