A Single LED is very small, and their luminance is related to the amount of driving current. Sufficient luminance for an illuminator requires many LEDs to be connected together and a constant current supplied to each LED. Therefore, the LED drive circuit must have constant-output-current control and/or constant-luminance control. We propose an LED drive circuit that consists of a boost-type DC-...

in the present study, a model of a large lithium polymer (li-po) battery for use in the simulation of hybrid electric vehicles (hevs) is developed. to attain this goal, an equivalent circuit (ec) consisting of a series resistor and two rc parallel networks is considered. the accuracy and the response time of the model for use in an hev simulator are studied. the battery parameters identificatio...

in order to solve the problem of fuel pollution, the diesel fuel for power generation of marine was abandoned and shore power supply have been proposed at the historic moment. the shore power supply which needs transferring 380v/50hz to 450v/60hz is used on shipping who need this kind of power, so effectively curbs the emissions of pollution gas into the air, and achieves the purpose of improvi...

The U.S. National Institute of Standards and Technology (NIST) provides a number of particulate matter (PM) standard reference materials (SRM) for use in environmental and toxicological methodology and research. We present here the first analysis with respect to the molecular structure of the carbon in three such NIST SRM samples, i.e., diesel engine exhaust soot from heavy duty equipment engin...

201 One cannot meaningfully evaluate solar geoengineering without a scenario for its implementation. It is now common, for example, to assert that more scientific research is needed to assess the balance between the risks and benefits of solar geoengineering, hereafter called solar radiation management (SRM). Yet the balance between risks and benefits depends at least as strongly on how SRM is ...

A new zero-current-transition (ZCT) converter for switched reluctance motor drives is presented. The proposed ZCT converter possesses the definite advantages that both the main and auxiliary switches are operating with zero-current switching (ZCS), as well as minimum current and voltage stresses. It has simple circuit topology, minimum component count and low cost. The ZCT technique can signifi...

If implementation of proposals to engineer the climate through solar-radiation management (SRM) ever occurs, it is likely to be contingent on climate sensitivity. However, modelling studies examining the effectiveness of SRM as a strategy to offset anthropogenic climate change have used only the standard parameterizations of atmosphere–ocean general circulation models that yield climate sensiti...

Two new species of Stenochironomus Kieffer, 1919 are described in Brazil. New records of Stenochironomus nudipupa Borkent, 1984 and S. gladius Borkent, 1984 from Brazil, new data on geographical distribution of S. jubatus Borkent, 1984 and S. triannulatus Borkent, 1984 from the State of Roraima, and S. bacrionis Borkent, 1984 recorded from the State of Amazonas, as well as emended descriptions ...

The paper deals with steady state modeling of static slip energy recovery controlled slip ring induction motor drive. The dc equivalent circuit model of the drive is developed using power balance relationship. The steady state performance equations of the drive are derived using the model. The predicted performance characteristics of the drive are compared with the experimental investigation. T...