scholarly journals Evaluation of energy efficiency of the long distance energy transport systems for renewable energy

2019 ◽  
Vol 114 ◽  
pp. 02003
Author(s):  
S.P. Popov ◽  
O.A. Baldynov
Keyword(s):  
Energy Efficiency ◽  
Renewable Energy ◽  
Energy Transport ◽  
Energy Analysis ◽  
Renewable Energy Sources ◽  
Bound State ◽  
Transport Systems ◽  
Long Distance ◽  
Long Distance Transport ◽  
Distance Transport

This article describes the systems of long-distance transport of energy from renewable energy sources. A comparative analysis of the energy efficiency of energy complexes in the transport of energy analysis is performed carriers such as electricity and hydrogen in a liquefied and chemically bound state.

scholarly journals Evaluation of Traveling Parameters in Parallel Long-Distance Public Transport

2019 ◽  
Vol 49 (1) ◽  
pp. 74-79
Author(s):  
András Lakatos ◽  
Péter Mándoki
Keyword(s):  
Public Transport ◽  
Current Problem ◽  
Transport Systems ◽  
Passenger Transport ◽  
Long Distance ◽  
Railway Systems ◽  
Long Distance Transport ◽  
Distance Transport ◽  
A Current

The ongoing competition between bus and railway systems in Hungarian long-distance public transport is a current problem. Long term sustainability and efficiency in passenger transport require a balanced transport policy. These subsectors need to complement each other, not compete. The parallel bus and railway links, which are present in most relations of Hungary, can result in a competition. This research analyze traveling parameters (distance and time) in case of parallel long-distance transport systems and evaluate them with a mathematical method for long term environmental and economic sustainability optimization. This investigation's hypothesis is to define difference segments of optimization gear to travel time and travel distance.

The Fine Structure of Phloem Cells

1985 ◽  
Vol 43 ◽  
pp. 632-635
Author(s):  
James Cronshaw
Keyword(s):  
Structural Studies ◽  
High Concentration ◽  
Long Distance ◽  
Phloem Tissue ◽  
Sieve Elements ◽  
Long Distance Transport ◽  
P Protein ◽  
Companion Cells ◽  
Electron Microscopical ◽  
Distance Transport

Long distance transport in plants takes place in phloem tissue which has characteristic cells, the sieve elements. At maturity these cells have sieve areas in their end walls with specialized perforations. They are associated with companion cells, parenchyma cells, and in some species, with transfer cells. The protoplast of the functioning sieve element contains a high concentration of sugar, and consequently a high hydrostatic pressure, which makes it extremely difficult to fix mature sieve elements for electron microscopical observation without the formation of surge artifacts. Despite many structural studies which have attempted to prevent surge artifacts, several features of mature sieve elements, such as the distribution of P-protein and the nature of the contents of the sieve area pores, remain controversial.

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