Abstract The use of renewable energy is central for the realization a circular economy, which essential further global economic development. In this background, hydrogen storage materials play an important role. Here we propose previously overlooked, industrially available bulk chemical (methyl formate, MF) as efficient and practical material. Utilizing appropriate catalysts, production from MF...

Multi-carrier energy systems (MCESs) provide collaboration between various kinds of carriers to supply the electricity, heating, and cooling demands. With widespread use MCESs in recent years, security assessment has attracted attention many contemporary researchers. However, complexity an MCES, including electrical, natural gas, district heating networks, different uncertainties imposes vast c...

In this paper, component carrier selection and beamforming on carrier aggregated channels in Heterogeneous Networks are proposed. The scheme jointly selects the component carrier and precoding (i.e. beamforming) vectors with the cooperation of the other cells to deal with the interference between Macro cell and Pico cell. The component carrier selection and beamforming is achieved by optimizing...

Communications networks are changing dramatically as lines blur between traditional telecom, wireless, and cable networks. The value of bundling communication services is accelerating carrier investment in triple-play (voice, video, and data) networks. Managing these services on a common IP network leads to a dramatic reduction in operational expenses. In addition, this migration to IP networks...

In this paper, a novel dynamic contention window control scheme is presented to improve the performance and energy efficiency of IEEE 802.11-based CSMA/CA DCF wireless networks operating in ad-hoc mode. The number of competing nodes in physical carrier sense systems has a major influence on the probability of collisions and a subsequent impact on DCF performance and on the energy consumed. A ne...

In this paper, we propose an Improved Power Control MAC (IPCM) protocol which improves the throughput and yields energy saving. This protocol sends all the packets RTS, CTS, DATA and ACK with optimal transmit power, which save the energy, makes spatial reuse of the wireless channels, and achieves the maximum throughput. On the other hand, the power of the data packets is periodically raised to ...