J. Ullmann

474 total citations
31 papers, 403 citations indexed

About

J. Ullmann is a scholar working on Materials Chemistry, Computational Mechanics and Mechanics of Materials. According to data from OpenAlex, J. Ullmann has authored 31 papers receiving a total of 403 indexed citations (citations by other indexed papers that have themselves been cited), including 23 papers in Materials Chemistry, 20 papers in Computational Mechanics and 14 papers in Mechanics of Materials. Recurrent topics in J. Ullmann's work include Diamond and Carbon-based Materials Research (21 papers), Ion-surface interactions and analysis (16 papers) and Metal and Thin Film Mechanics (14 papers). J. Ullmann is often cited by papers focused on Diamond and Carbon-based Materials Research (21 papers), Ion-surface interactions and analysis (16 papers) and Metal and Thin Film Mechanics (14 papers). J. Ullmann collaborates with scholars based in Germany, United States and Japan. J. Ullmann's co-authors include J. E. E. Baglin, P. Oelhafen, G. Francz, Petra Reinke, A. J. Kellock, G. Schmidt, Gerhard Wolf, W. Grünewald, K. Baba and Norbert Kaiser and has published in prestigious journals such as Physical review. B, Condensed matter, Journal of Applied Physics and Thin Solid Films.

In The Last Decade

J. Ullmann

29 papers receiving 387 citations

Peers — A (Enhanced Table)

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

Name h Career Trend Papers Cites
J. Ullmann Germany 10 304 195 142 114 43 31 403
Shigetaro Ogura Japan 11 207 0.7× 106 0.5× 206 1.5× 115 1.0× 103 2.4× 21 410
C.‐P. Klages Germany 16 447 1.5× 370 1.9× 285 2.0× 67 0.6× 23 0.5× 34 590
M. Filippi Italy 13 227 0.7× 76 0.4× 136 1.0× 46 0.4× 98 2.3× 25 349
K. Šlapikas Lithuania 14 336 1.1× 179 0.9× 80 0.6× 58 0.5× 14 0.3× 30 418
Shin Fukuda Japan 13 269 0.9× 137 0.7× 154 1.1× 61 0.5× 35 0.8× 42 421
M. Kuhr Germany 15 634 2.1× 495 2.5× 217 1.5× 109 1.0× 49 1.1× 19 744
T. Hartnett United States 12 319 1.0× 80 0.4× 193 1.4× 42 0.4× 21 0.5× 19 461
J. Luthin Germany 9 273 0.9× 169 0.9× 65 0.5× 60 0.5× 21 0.5× 13 356
V. Kopustinskas Lithuania 14 362 1.2× 257 1.3× 167 1.2× 72 0.6× 111 2.6× 47 571
T. Mitamura Japan 10 186 0.6× 90 0.5× 62 0.4× 118 1.0× 25 0.6× 41 324

Countries citing papers authored by J. Ullmann

Since Specialization
Citations

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

Fields of papers citing papers by J. Ullmann

Since Specialization
Physical SciencesHealth SciencesLife SciencesSocial Sciences

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

Co-authorship network of co-authors of J. Ullmann

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

All Works

20 of 20 papers shown
1.
Ullmann, J., et al.. (2010). Evaluation of Solar Combisystems – Overview and Methodology. 1–8. 1 indexed citations
2.
Ullmann, J., et al.. (2010). Comparison of two Different Methods for Solar Combisystems Performance Testing. 1–8. 3 indexed citations
3.
Ullmann, J., et al.. (2002). Application of the Tauc-Lorentz formulation to the interband absorption of optical coating materials. Applied Optics. 41(16). 3137–3137. 105 indexed citations
4.
Ullmann, J., et al.. (1999). <title>Mechanical stress in fluoride coatings</title>. Proceedings of SPIE, the International Society for Optical Engineering/Proceedings of SPIE. 3738. 136–147. 9 indexed citations
5.
Ullmann, J.. (1998). Proposal of a novel in situ stress-reducing method for the growth of c-BN. Thin Solid Films. 326(1-2). 43–46. 4 indexed citations
6.
Thielsch, Roland, Joerg Heber, Stefan Jakobs, et al.. (1997). Optical, structural and mechanical properties of lanthanide trifluoride thin film materials for use in the DUV-spectral region. Optical Interference Coatings. TuA.7–TuA.7. 2 indexed citations
7.
Ullmann, J.. (1997). Low energy ion assisted carbon film growth: methods and mechanisms. Nuclear Instruments and Methods in Physics Research Section B Beam Interactions with Materials and Atoms. 127-128. 910–917. 16 indexed citations
8.
Ullmann, J., et al.. (1997). Formation of boron nitride films with various amounts of the cubic phase. Surface and Coatings Technology. 97(1-3). 281–290. 7 indexed citations
9.
Reinke, Petra, G. Francz, P. Oelhafen, & J. Ullmann. (1996). Structural changes in diamond and amorphous carbon induced by low-energy ion irradiation. Physical review. B, Condensed matter. 54(10). 7067–7073. 55 indexed citations
10.
Kolitsch, A., et al.. (1995). The effect of a post-treatment of amorphous carbon films with high energy ion beams. Nuclear Instruments and Methods in Physics Research Section B Beam Interactions with Materials and Atoms. 106(1-4). 511–516. 8 indexed citations
11.
Ullmann, J., et al.. (1995). Ions as a useful tool for carbon film deposition and modification. Nuclear Instruments and Methods in Physics Research Section B Beam Interactions with Materials and Atoms. 106(1-4). 96–105. 9 indexed citations
12.
Falke, U., et al.. (1995). Dispersion of the Valence Electron Energy Loss in ThinAmorphous Carbon Films deposited by Ion AssistedEvaporation of Graphite. Microscopy Microanalysis Microstructures. 6(1). 113–120. 5 indexed citations
13.
Ullmann, J., et al.. (1995). Effect of deposition conditions on the growth and behaviour of thin carbon films prepared by ion-assisted evaporation. Surface and Coatings Technology. 74-75. 746–753. 4 indexed citations
14.
Ullmann, J., et al.. (1994). Low energy ion-induced damage of polycrystalline diamond films. Diamond and Related Materials. 3(4-6). 663–671. 9 indexed citations
15.
Ullmann, J., et al.. (1994). Growth Conditions Affecting the Electrochemical and Mechanical Stability of Carbon Films Prepared by Ion Assisted Evaporation. physica status solidi (a). 145(2). 299–309. 3 indexed citations
16.
Ullmann, J., et al.. (1993). Ion-assisted modification of the condensation of thermal carbon atoms. Surface and Coatings Technology. 59(1-3). 255–260. 7 indexed citations
17.
Ullmann, J., Gerhard Wolf, & W. Möller. (1993). Ion stimulated densification of amorphous carbon films. Nuclear Instruments and Methods in Physics Research Section B Beam Interactions with Materials and Atoms. 80-81. 1507–1510. 6 indexed citations
18.
Ullmann, J., et al.. (1992). Diamond-like amorphous carbon films prepared by r.f. sputtering in argon: electron-assisted investigations. Thin Solid Films. 219(1-2). 109–118. 13 indexed citations
19.
Ullmann, J., et al.. (1990). Preparation of thin hydrogenated carbon and silicon-carbon layers. Synthetic Metals. 37(1-3). 341–347. 1 indexed citations
20.
Grünewald, W. & J. Ullmann. (1990). Cross-Sectional Transmission Electron Microscopy Investigations of RF-Sputtered a-C Films. physica status solidi (a). 122(2). K129–K131. 3 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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