N. Wagner

3.9k total citations · 2 hit papers
90 papers, 3.0k citations indexed

About

N. Wagner is a scholar working on Geochemistry and Petrology, Ocean Engineering and Mechanics of Materials. According to data from OpenAlex, N. Wagner has authored 90 papers receiving a total of 3.0k indexed citations (citations by other indexed papers that have themselves been cited), including 51 papers in Geochemistry and Petrology, 38 papers in Ocean Engineering and 35 papers in Mechanics of Materials. Recurrent topics in N. Wagner's work include Coal and Its By-products (50 papers), Coal Properties and Utilization (36 papers) and Hydrocarbon exploration and reservoir analysis (32 papers). N. Wagner is often cited by papers focused on Coal and Its By-products (50 papers), Coal Properties and Utilization (36 papers) and Hydrocarbon exploration and reservoir analysis (32 papers). N. Wagner collaborates with scholars based in South Africa, United States and Portugal. N. Wagner's co-authors include James C. Hower, Kimon Christanis, Sanja Potgieter‐Vermaak, J.H.P. van Heerden, Stavros Kalaitzidis, Deolinda Flores, Sandra Rodrigues, Magdalena Misz‐Kennan, J. Kus and Brian J. Cardott and has published in prestigious journals such as SHILAP Revista de lepidopterología, PLoS ONE and The Science of The Total Environment.

In The Last Decade

N. Wagner

82 papers receiving 3.0k citations

Hit Papers

align trajectories

What are hit papers?

Hit papers significantly outperform the citation benchmark for their cohort. A paper qualifies if it has ≥500 total citations, achieves ≥1.5× the top-1% citation threshold for papers in the same subfield and year (this is the minimum needed to enter the top 1%, not the average within it), or reaches the top citation threshold in at least one of its specific research topics.

Classification of liptinite – ICCP System 1994

2016 685 citations Walter Pickel, J. Kus et al. International Journal of Coal Geology profile →
On the fundamental difference between coal rank and coal type

2013 295 citations Kimon Christanis, Shifeng Dai et al. International Journal of Coal Geology profile →

Peers — A (Enhanced Table)

Peers by citation overlap · career bar shows stage (early→late) cites · hero ref

Name	h						Papers	Cites
N. Wagner South Africa	23	1.6k	1.2k	1.1k	552	460	90	3.0k
Isabel Suárez‐Ruíz Spain	34	1.2k 0.8×	1.3k 1.1×	1.1k 1.0×	852 1.5×	498 1.1×	102	3.5k
Deolinda Flores Portugal	30	1.8k 1.1×	1.6k 1.3×	1.1k 1.0×	355 0.6×	292 0.6×	106	3.7k
Yuzhuang Sun China	35	2.2k 1.4×	1.2k 1.0×	1.1k 1.0×	454 0.8×	512 1.1×	134	4.1k
W. Kalkreuth Brazil	33	1.5k 0.9×	2.2k 1.9×	1.3k 1.1×	401 0.7×	313 0.7×	131	3.7k
Bruno Valentim Portugal	22	842 0.5×	515 0.4×	519 0.5×	330 0.6×	248 0.5×	85	1.7k
Ruoyu Sun China	38	1.3k 0.8×	443 0.4×	637 0.6×	476 0.9×	239 0.5×	132	4.1k
Wenhui Huang China	27	977 0.6×	3.0k 2.6×	2.8k 2.6×	155 0.3×	751 1.6×	114	4.4k
Ángeles G. Borrego Spain	32	705 0.4×	532 0.5×	549 0.5×	1.2k 2.2×	581 1.3×	98	2.4k
Cunliang Zhao China	26	1.6k 1.0×	451 0.4×	744 0.7×	145 0.3×	263 0.6×	68	2.1k

Countries citing papers authored by N. Wagner

Since Specialization

Citations

This map shows the geographic impact of N. Wagner'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 N. Wagner with the expected number of citations based on a country's size and research output (numbers larger than one mean the country cites N. Wagner more than expected).

Fields of papers citing papers by N. Wagner

Since Specialization

Physical SciencesHealth SciencesLife SciencesSocial Sciences

This network shows the impact of papers produced by N. Wagner. 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 N. Wagner. The network helps show where N. Wagner may publish in the future.

Co-authorship network of co-authors of N. Wagner

This figure shows the co-authorship network connecting the top 25 collaborators of N. Wagner. A scholar is included among the top collaborators of N. Wagner 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 N. Wagner. N. Wagner is excluded from the visualization to improve readability, since they are connected to all nodes in the network.

All Works

Sort: Min cites: Since: Top N: Style:

20 of 20 papers shown

Wagner, N., et al.. (2025). The distribution and occurrence of rare earth elements (REEs) in coal and industrial scale boiler and gasifier ash. Fuel. 405. 136618–136618.

Wagner, N., et al.. (2025). Organic petrographical, geochemical, and mineralogical features of the Permian Coalbrook Sub-basin, South Africa: Reconstruction of paleo-depositional conditions. SHILAP Revista de lepidopterología. 3. 100067–100067.

Wagner, N., et al.. (2025). Modes of occurrence of rare earth-bearing minerals in South African coal and ash samples using electron microscopy. Minerals Engineering. 230. 109436–109436.

Bunt, John R., et al.. (2024). Structural analysis and gasification reactivity of chars derived from the slow pyrolysis of extruded coal fines and recycled plastic. Heliyon. 10(20). e39391–e39391.

Wagner, N., et al.. (2024). An assessment of Rare Earth Elements in borehole cores from the Ermelo, Witbank and Waterberg Coalfields, South Africa: Focus on mode of occurrence. Journal of the Southern African Institute of Mining and Metallurgy. 124(10). 559–566. 1 indexed citations

Wagner, N., et al.. (2023). Application of Organic Petrology and Raman Spectroscopy in Thermal Maturity Determination of the Karoo Basin (RSA) Shale Samples. Minerals. 13(9). 1199–1199. 1 indexed citations

Wagner, N., et al.. (2022). Petrology of the A and B Seams, Ermelo Coalfield (South Africa): Indications for changing palaeoenvironmental and sedimentary conditions. International Journal of Coal Geology. 263. 104135–104135. 13 indexed citations

Tsikos, Harilaos, et al.. (2022). Dual sea-level-climatic controls on the stratigraphic distribution of total organic carbon content and macerals in the Permian black shales of southwest Gondwana. Journal of African Earth Sciences. 188. 104495–104495. 6 indexed citations

Ahmed, Usman, et al.. (2021). Quantification of radionuclides and associated radiological risk estimation of coal combustion residues from a South African coal-fired power plant. Internatuinal Journal of Radiation Research. 19(1). 89–97. 1 indexed citations

10.

Wagner, N., et al.. (2021). Macromolecular structural changes in contact metamorphosed inertinite-rich coals from the No. 2 Seam, Witbank Coalfield (South Africa): Insights from petrography, NMR and XRD. International Journal of Coal Geology. 247. 103857–103857. 16 indexed citations

11.

Lázaro‐Martínez, Juan M., Barbara Białecka, Mihai Cruceru, et al.. (2020). Assessment of Graphitized Coal Ash Char Concentrates as a Potential Synthetic Graphite Source. Minerals. 10(11). 986–986. 22 indexed citations

12.

Wagner, N., et al.. (2020). Quantification of U, Th and specific radionuclides in coal from selected coal fired power plants in South Africa. PLoS ONE. 15(5). e0229452–e0229452. 9 indexed citations

13.

Pickel, Walter, J. Kus, Deolinda Flores, et al.. (2016). Classification of liptinite – ICCP System 1994. International Journal of Coal Geology. 169. 40–61. 685 indexed citations breakdown →

14.

Wagner, N., et al.. (2015). Multi-objective optimization for the economic production of d-psicose using simulated moving bed chromatography. Journal of Chromatography A. 1398. 47–56. 17 indexed citations

15.

Wagner, N., et al.. (2015). Physical and structural effects of carbon dioxide storage on vitrinite-rich coal particles under subcritical and supercritical conditions. International Journal of Coal Geology. 150-151. 1–6. 26 indexed citations

16.

Hsu, C.-L., et al.. (2014). Investigation of cavity formation in lump coal in the context of underground coal gasification. Journal of the Southern African Institute of Mining and Metallurgy. 114(4). 305–310. 3 indexed citations

17.

Dai, Shifeng, Peipei Wang, Colin R. Ward, et al.. (2014). Elemental and mineralogical anomalies in the coal-hosted Ge ore deposit of Lincang, Yunnan, southwestern China: Key role of N2–CO2-mixed hydrothermal solutions. International Journal of Coal Geology. 152. 19–46. 169 indexed citations

18.

Izquierdo, María, Shifeng Dai, F.B. Waanders, et al.. (2013). Geochemistry of ultra-fine and nano-compounds in coal gasification ashes: A synoptic view. The Science of The Total Environment. 456-457. 95–103. 94 indexed citations

19.

Wagner, N., et al.. (2010). Heterologous production of L-pipecolic acid in Corynebacterium glutamicum. Journal of Biotechnology. 150. 400–400. 3 indexed citations

20.

Wagner, N., et al.. (2007). Characterization of unburned carbon present in coarse gasification ash. Fuel. 87(6). 683–691. 86 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.

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