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A method of swing on a swing is disclosed, in which a user positioned on a standard swing suspended by two chains from a substantially horizontal tree branch induces side to side motion by pulling alternately on one chain and then the other.
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| Number | Title | Issue Date |
| 8232014 | Fuel cell operational methods for hydrogen addition after shutdown A method for reducing the probability of an air/hydrogen front in a fuel cell stack is disclosed that includes closing anode valves for an anode side of the fuel cell stack to permit a desired quantity of hydrogen to be left in the anode side upon shutdown and deter... | 07/31/2012 |
| 8214174 | Algorithm for online adaptive polarization curve estimation of a fuel cell stack An algorithm for determining a polarization curve of a fuel cell stack. When the fuel cell stack is running and certain data validity criteria have been met, the algorithm goes into a data collection mode where it collects stack data, such as stack current density, ... | 07/03/2012 |
| 8192879 | Method for maximum net power calculation for fuel cell system based on online polarization curve estimation An algorithm for determining the maximum net power available from a fuel cell stack as the stack degrades over time using an online adaptive estimation of a polarization curve of the stack. The algorithm separates the current density range of the stack into sample r... | 06/05/2012 |
| 8088525 | Online low performing cell (LPC) prediction and detection of fuel cell system A system and method for detecting and predicting low performing cells in a fuel cell stack. When the fuel cell stack is running and certain data validity criteria have been met, an algorithm collects the data, such as stack current density, average cell voltage and ... | 01/03/2012 |
| 7993787 | Method for fast and reliable fuel cell system start-ups A method for providing a fast and reliable start-up of a fuel cell system. The method uses a stack voltage response to a load to assess if hydrogen and oxygen are being sufficiently distributed to all of the fuel cells by coupling an auxiliary load to the fuel cell ... | 08/09/2011 |
| 7968240 | System and method for shorting a fuel cell stack A fuel cell system is provided that includes a fuel cell stack with a plurality of fuel cells and a power converter in electrical communication with the fuel cell stack. The power converter is configured to selectively regulate a power of the fuel cell stack and sho... | 06/28/2011 |
| 7955744 | Method for fuel cell start-up with uniform hydrogen flow A fuel cell system is provided having a fuel cell stack including a plurality of fuel cells. The fuel cell system includes an anode supply manifold in fluid communication with the plurality of fuel cells, the anode supply manifold adapted to deliver a anode supply s... | 06/07/2011 |
| 7807308 | Fuel cell system and start-up method A fuel cell system including a fuel cell stack having a plurality of fuel cells is provided. An anode supply manifold and an anode exhaust manifold are in fluid communication with the anodes of the plurality of fuel cells. A first valve is in fluid communication wit... | 10/05/2010 |
