This map shows the geographic impact of Roger Sierens's research. It shows the number of citations coming from papers published by authors working in each country. You can also color the map by specialization and compare the number of citations received by Roger Sierens with the expected number of citations based on a country's size and research output (numbers larger than one mean the country cites Roger Sierens more than expected).
This network shows the impact of papers produced by Roger Sierens. Nodes represent research fields, and links connect fields that are likely to share authors. Colored nodes show fields that tend to cite the papers produced by Roger Sierens. The network helps show where Roger Sierens may publish in the future.
Co-authorship network of co-authors of Roger Sierens
This figure shows the co-authorship network connecting the top 25 collaborators of Roger Sierens.
A scholar is included among the top collaborators of Roger Sierens based on the total number of
citations received by their joint publications. Widths of edges
represent the number of papers authors have co-authored together.
Node borders
signify the number of papers an author published with Roger Sierens. Roger Sierens is excluded from
the visualization to improve readability, since they are connected to all nodes in the network.
Vancoillie, Jeroen, et al.. (2011). Efficiency comparison between hydrogen, methanol and gasoline on a production-type four-cylinder engine. Ghent University Academic Bibliography (Ghent University).4 indexed citations
3.
Demuynck, Joachim, Michel De Paepe, Roger Sierens, Jeroen Vancoillie, & Sebastian Verhelst. (2011). Literature review on the convective heat transfer measurements in spark ignition engines. Ghent University Academic Bibliography (Ghent University).2 indexed citations
4.
Demuynck, Joachim, Michel De Paepe, Roger Sierens, & Sebastian Verhelst. (2010). Heat transfer measurements inside a gas fuelled spark ignited engine for model validation. Ghent University Academic Bibliography (Ghent University).1 indexed citations
5.
Sierens, Roger & Sebastian Verhelst. (2009). Hydrogen versus gasoline efficiency comparison for a port injected bi-fuel hydrogen/gasoline engine. Ghent University Academic Bibliography (Ghent University).1 indexed citations
6.
Verhelst, Sebastian & Roger Sierens. (2009). Recent progress in hydrogen-fueled internal combustion engines. Ghent University Academic Bibliography (Ghent University). 211–249.1 indexed citations
7.
Sierens, Roger, et al.. (2008). Evaluación del funcionamiento de motores de combustión interna trabajando con biodiesel.. SHILAP Revista de lepidopterología.2 indexed citations
8.
Verhelst, Sebastian, et al.. (2006). Combustion Strategies and NOx emissions for hydrogen fuelled IC engines. Ghent University Academic Bibliography (Ghent University).7 indexed citations
9.
Verhelst, Sebastian, et al.. (2006). Combustion Strategies for Hydrogen Fuelled Engines. Ghent University Academic Bibliography (Ghent University).2 indexed citations
10.
Verhelst, Sebastian, et al.. (2005). Combustion strategies for hydrogen fuelled IC engines. Ghent University Academic Bibliography (Ghent University).1 indexed citations
11.
Sierens, Roger, et al.. (2005). EGR and lean combustion strategies for a single cylinder hydrogen fuelled IC engine. Ghent University Academic Bibliography (Ghent University).9 indexed citations
12.
Verhelst, Sebastian & Roger Sierens. (2004). The laminar burning velocity of mixtures of hydrogen, air and residuals at spark-ignition engine conditions. Ghent University Academic Bibliography (Ghent University).1 indexed citations
13.
Sierens, Roger, et al.. (2004). A high speed single cylinder hydrogen fuelled internal combustion engine. Ghent University Academic Bibliography (Ghent University).18 indexed citations
14.
Verhelst, Sebastian & Roger Sierens. (2002). Simulation of hydrogen combustion in spark-ignition engines. Ghent University Academic Bibliography (Ghent University).2 indexed citations
15.
Sierens, Roger & Sebastian Verhelst. (2001). Influence of the injection parameters on the efficiency and power output of a hydrogen fuelled engine.. Ghent University Academic Bibliography (Ghent University).3 indexed citations
16.
Sierens, Roger & Sebastian Verhelst. (2001). A HYDROGEN FUELLED V-8 ENGINE FOR CITY-BUS APPLICATION. International Journal of Automotive Technology. 2(2). 39–45.18 indexed citations
17.
Verhelst, Sebastian & Roger Sierens. (2000). Aspects concerning the optimisation of a hydrogen fueled engine. Ghent University Academic Bibliography (Ghent University).2 indexed citations
18.
Sierens, Roger & Sebastian Verhelst. (2000). Experimental study of a hydrogen fuelled engine. Ghent University Academic Bibliography (Ghent University).5 indexed citations
19.
Sierens, Roger. (1999). The development of a hydrogen fueled V-8 engine. Ghent University Academic Bibliography (Ghent University).2 indexed citations
20.
Sierens, Roger, et al.. (1998). Backfire mechanism in a carburetted hydrogen fuelled engine. Ghent University Academic Bibliography (Ghent University).11 indexed citations
Rankless uses publication and citation data sourced from OpenAlex, an open and comprehensive
bibliographic database. While OpenAlex provides broad and valuable coverage of the global
research landscape, it—like all bibliographic datasets—has inherent limitations. These include
incomplete records, variations in author disambiguation, differences in journal indexing, and
delays in data updates. As a result, some metrics and network relationships displayed in
Rankless may not fully capture the entirety of a scholar's output or impact.