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Lister, T.E.; Wang, P.; Anderko, A
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Lyubomyr Sabadosh, Serhii Larkov, Oleg Kravchenko and Vladyslav Sereda
Numerous attempts have been undertaken to develop propulsion systems for nano-satellite-type spacecrafts to enable their maneuvering in orbits. One of the potentially viable chemical propellant propulsion systems is a hybrid system. The present paper studies propellant composition variants with the metal hydride as fuel that can be chosen for a nano-satellite hybrid propulsion system. It defines key requirements for chemical propellant nano-satellite propulsion systems, and specifies potential propellant pairs based on a compact metal hydride. The study describes basic technical characteristics of a 1U CubeSat propulsion system.
P. Suskis, A. Andreiciks, I. Steiks, O. Krievs and J. Kleperis
The authors propose a micro-grid for autonomous wind-and-hydrogen power generation thus replacing such traditional fossil-fuelled equipment as domestic diesel generators, gas micro-turbines, etc. In the proposed microgrid the excess of electrical energy from a wind turbine is spent on electrolytic production of hydrogen which is then stored under low-pressure in absorbing composite material. The electrolyser has a non-traditional feeding unit and electrode coatings. The proposed DC/DC conversion topologies for different micro-grid nodes are shown to be well-designed. The prototypes elaborated for the converters and hydrogen storage media were tested and have demonstrated a good performance.
Nowadays, the use of remote monitoring and transmission of vital parameters became extremely common, because these systems reduce the degree of risk among ill people and provide an additional time necessary for the intervention teams - in case of emergency action. Generally, these devices monitor and transmit data as values of blood pressure and the heart rate. This equipment permanently worn by the ill people have as sources of electric energy supply batteries or accumulators. The behavior of batteries and the parameters measurement for different operating states are defined as particularly important analyses, especially in terms of voltage and time. In this article we have analyzed two types of batteries (Lithium-Ion and Nickel-Metal Hydride) with different characteristics, using a monitoring device that measures the depth of discharge (DOD) while under load in our biomedical system. The battery characterizations were made while the system was operating measuring the body signs and transmitting the data.
J. Kleperis, P. Lesnicenoks, L. Grinberga, G. Chikvaidze and J. Klavins
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Romualdas Juknelevičius, Roopesh Kumar Mehra, Fanhua Ma and Stanislaw Szwaja
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Chuan-Jun Yue, Qiu-Neng Xu, Li-Ping Gu and Jin-Fang Wang
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Jacek Antonkiewicz, Czesława Jasiewicz, Małgorzata Koncewicz-Baran and Renata Bączek-Kwinta
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