Change search
Link to record
Permanent link

Direct link
BETA
Holleboom, Thijs JanORCID iD iconorcid.org/0000-0003-0861-2813
Alternative names
Publications (10 of 36) Show all publications
AlMotasem, A. T., Bergström, J., Gåård, A., Krakhmalev, P. & Holleboom, T. J. (2017). Atomistic insights on the wear/friction behavior of nanocrystalline ferrite during nanoscratching as revealed by molecular dynamics. Tribology letters, 65(3), 101
Open this publication in new window or tab >>Atomistic insights on the wear/friction behavior of nanocrystalline ferrite during nanoscratching as revealed by molecular dynamics
Show others...
2017 (English)In: Tribology letters, ISSN 1023-8883, E-ISSN 1573-2711, Vol. 65, no 3, p. 101-Article in journal (Refereed) Published
Abstract [en]

Using embedded atom method potential, extensive large-scale molecular dynamics (MD) simulations of nanoindentation/nanoscratching of nanocrystalline (nc) iron have been carried out to explore grain size dependence of wear response. MD results show no clear dependence of the frictional and normal forces on the grain size, and the single-crystal (sc) iron has higher frictional and normal force compared to nc-samples. For all samples, the dislocation- mediated mechanism is the primary cause of plastic deformation in both nanoindentation/nanoscratch. However, secondary cooperative mechanisms are varied significantly according to grain size. Pileup formation was observed in the front of and sideways of the tool, and they exhibit strong dependence on grain orientation rather than grain size. Tip size has significant impact on nanoscratch characteristics; both frictional and normal forces monotonically increase as tip radii increase, while the friction coefficient value drops by about 38%. Additionally, the increase in scratch depth leads to an increase in frictional and normal forces as well as friction coefficient. To elucidate the relevance of indentation/scratch results with mechanical properties, uniaxial tensile test was performed for nc-samples, and the result indicates the existence of both the regular and inverse Hall-Petch relations at critical grain size of 110.9 angstrom. The present results suggest that indentation/scratch hardness has no apparent correlation with the mechanical properties of the substrate, whereas the plastic deformation has.

Place, publisher, year, edition, pages
New York: Springer, 2017
Keywords
Atomistic, polycrystalline iron, scratch hardness, wear, dislocations, twinning
National Category
Materials Engineering
Research subject
Materials Engineering
Identifiers
urn:nbn:se:kau:diva-63698 (URN)10.1007/s11249-017-0876-y (DOI)000405488400027 ()
Available from: 2017-09-14 Created: 2017-09-14 Last updated: 2019-12-02Bibliographically approved
Zhang, H., Holleboom, T. J. & Johansson, L. (2017). Band splitting of quantum wells of thin Ag films on Sn/Si(111)√3×√3. Physical Review B, 96(4), 041402-1-041402-6
Open this publication in new window or tab >>Band splitting of quantum wells of thin Ag films on Sn/Si(111)√3×√3
2017 (English)In: Physical Review B, ISSN 2469-9950, E-ISSN 2469-9969, Vol. 96, no 4, p. 041402-1-041402-6Article in journal (Refereed) Published
Abstract [en]

High-resolution valence band spectra of ultrathin Ag films on Sn/Si(111)√3×√3 show intrinsic splitting of the quantum-well states (QWSs). Especially at low coverages, the QWSs of such a system display delicate coupling characters with the bulk bands from the substrate. The observed QWS splitting agrees well with the result of the theoretical calculation. We found that the splitting originates from an interface with a finite thickness. In addition, the interface also causes a large sp band splitting due to the Umklapp scattering in the Γ−M direction of the Ag(111) surface Brillouin zone.

Place, publisher, year, edition, pages
American Physical Society, 2017
Keywords
electronic structure, metals, semiconductors, quantum wells, thin films, first-principles calculation, photoemission spectroscopy
National Category
Condensed Matter Physics
Research subject
Physics
Identifiers
urn:nbn:se:kau:diva-62779 (URN)10.1103/PhysRevB.96.041402 (DOI)000405026300008 ()
Funder
Swedish Research Council, 2013-5291
Available from: 2017-09-08 Created: 2017-09-08 Last updated: 2019-11-04Bibliographically approved
AlMotasem, A. T., Bergström, J., Gåård, A., Krakhmalev, P. & Holleboom, T. J. (2017). Tool microstructure impact on the wear behavior of ferrite iron during nanoscratching: An atomic level simulation. Wear, 370-371, 39-45
Open this publication in new window or tab >>Tool microstructure impact on the wear behavior of ferrite iron during nanoscratching: An atomic level simulation
Show others...
2017 (English)In: Wear, ISSN 0043-1648, E-ISSN 1873-2577, Vol. 370-371, p. 39-45Article in journal (Refereed) Published
Abstract [en]

In the present work, molecular dynamics simulations were used to investigate the impact of the tool microstructure on the wear behavior of ferrite workpiece during nanoscratching. The tool microstructure was modified by varying the carbide (cementite) contents. The simulation results show that dislocations are the primary mechanism for plastic deformation of the workpiece material. It is found that total dislocation length varies significantly depending on the carbide content in the tool. Furthermore, other tribological phenomena were also observed to depend on the carbide contents. For example, the average value of frictional forces decreased while the normal force increases with increasing carbide contents, and hence the friction coefficient was decreased. Additionally, the shape and size of lateral and frontal pileups are lowered. The structural analysis of the pileup region reveals the loss of long range order and start of amorphisation. The temperature distribution of the pileup regions showed an increase of the pileup temperature when carbide is added into tool. The wear volume is considerably reduced when the carbide content increases. The average scratch hardness was found to decrease and the result was analyzed with the theoretical Taylor hardening model.

Place, publisher, year, edition, pages
Elsevier, 2017
Keywords
Molecular dynamics, Carbide, Wear volume, Dislocation, Pileup
National Category
Materials Engineering
Identifiers
urn:nbn:se:kau:diva-55215 (URN)10.1016/j.wear.2016.11.008 (DOI)000392776300005 ()
Available from: 2017-06-20 Created: 2017-06-20 Last updated: 2019-11-04Bibliographically approved
Almotasem, A., Bergström, J., Gåård, A., Krakhmalev, P. & Holleboom, T. J. (2016). A molecular dynamic study on the influence of carbide particles in ferrite on material transfer during nanoscratching of ferritic iron. In: Simancik, Frantisek (Ed.), Proceedings of the 10th International Tool Conference: TOOL, 10th International TOOL Conference : 04th to 07th October 2016, Bratislava, Slovakia. Paper presented at 10th TOOL Conference 2016 - TOOL 2016, Bratislava, Slovakia.
Open this publication in new window or tab >>A molecular dynamic study on the influence of carbide particles in ferrite on material transfer during nanoscratching of ferritic iron
Show others...
2016 (English)In: Proceedings of the 10th International Tool Conference: TOOL, 10th International TOOL Conference : 04th to 07th October 2016, Bratislava, Slovakia / [ed] Simancik, Frantisek, 2016Conference paper, Published paper (Refereed)
National Category
Materials Engineering
Research subject
Materials Engineering
Identifiers
urn:nbn:se:kau:diva-63702 (URN)9783200047860 (ISBN)
Conference
10th TOOL Conference 2016 - TOOL 2016, Bratislava, Slovakia
Available from: 2017-09-14 Created: 2017-09-14 Last updated: 2019-11-04Bibliographically approved
AlMotasem, A. T., Bergström, J., Gåård, A., Krakhmalev, P. & Holleboom, T. J. (2016). Adhesion between ferrite iron-€“iron/cementite countersurfaces: A molecular dynamics study. Tribology International, 103, 113-120
Open this publication in new window or tab >>Adhesion between ferrite iron-€“iron/cementite countersurfaces: A molecular dynamics study
Show others...
2016 (English)In: Tribology International, ISSN 0301-679X, E-ISSN 1879-2464, Vol. 103, p. 113-120Article in journal (Refereed) Published
Abstract [en]

The adhesive properties of Fe(110)/Fe(110) and Fe3C(001)/Fe(110) countersurfaces have been investigated by using classical molecular dynamics simulations. The simulation results show that Fe3C/Fe exhibits a relatively lower adhesion compared to the Fe/Fe. Additionally, the temperature dependence of the adhesive properties between 300–700 K has been examined. The results demonstrate that, with increasing the temperature, the values of the adhesion force and the work of adhesion continuously decrease in the case of Fe3C/Fe; they initially slightly increase up to 500 K then decrease in the case of Fe/Fe. Furthermore, the effect of lattice coherency between Fe/Fe has been examined and found to slightly reduce the adhesion. These results explain how carbides improve galling resistance of tool steel observed during dry sliding. 

Place, publisher, year, edition, pages
Elsevier, 2016
Keywords
Adhesion; Carbides; Iron; Temperature distribution; Tool steel, Adhesive properties; Cementite; Classical molecular dynamics; Commensurability; Galling resistance; Lattice coherency; Temperature dependence; Work of adhesion, Molecular dynamics
National Category
Materials Engineering Nano Technology
Research subject
Materials Engineering
Identifiers
urn:nbn:se:kau:diva-45815 (URN)10.1016/j.triboint.2016.06.027 (DOI)000384777100012 ()2-s2.0-84978120893 (Scopus ID)
Available from: 2016-09-09 Created: 2016-09-09 Last updated: 2019-11-04Bibliographically approved
Holleboom, T. J. & Garcia, J. (2010). Fragment Retention Characteristics in Slack Space: Analysis and Measurements. In: Proceedings Security and Communication Networks (IWSCN), 2010 2nd International Workshop on  Security and Communication Networks: . Paper presented at 2nd International Workshop on Security and Communucation Networks Karlstad 26-28 May 2010. IEEE Computer Society
Open this publication in new window or tab >>Fragment Retention Characteristics in Slack Space: Analysis and Measurements
2010 (English)In: Proceedings Security and Communication Networks (IWSCN), 2010 2nd International Workshop on  Security and Communication Networks, IEEE Computer Society, 2010Conference paper, Published paper (Refereed)
Abstract [en]

When files are deleted, their information is not removed from the storage media. This is a well known fact, and there exist numerous undelete utilities to recover newly deleted files. When deleted files have been partly overwritten, the data from the part of the file that remains in unallocated space can be readily extracted by file carving. Such carving is often performed in forensic investigations. Furthermore, as a consequence of file system implementation specifics, there additionally exist small remains of the previous files in the space at the end of new files. In this paper we focus on these small remains of previous files, or micro-fragments, that exist even after all the space allocated to the previous file has been reallocated to new files. We derive expressions for modeling the number of micro-fragments that can be expected to be found, and perform experiments to evaluate the analytical model. The obtained results indicate good correspondence between the analytical predictions and the measured results.

Place, publisher, year, edition, pages
IEEE Computer Society, 2010
Keywords
Computer Foresics, Fragment detection
National Category
Computer Sciences
Research subject
Computer Science
Identifiers
urn:nbn:se:kau:diva-9811 (URN)10.1109/IWSCN.2010.5497996 (DOI)978-1-4244-6938-3 (ISBN)978-1-4244-6939-0 (ISBN)
Conference
2nd International Workshop on Security and Communucation Networks Karlstad 26-28 May 2010
Available from: 2012-02-08 Created: 2012-02-08 Last updated: 2019-07-12Bibliographically approved
Gurnett, M., Holleboom, T., Zhang, H. & Johansson, L. (2009). Photoemission study of the Li/Ge(111)-3×1 reconstruction. Surface Science, 603(4), 727-735
Open this publication in new window or tab >>Photoemission study of the Li/Ge(111)-3×1 reconstruction
2009 (English)In: Surface Science, ISSN 0039-6028, E-ISSN 1879-2758, ISSN 0039-6028, Vol. 603, no 4, p. 727-735Article in journal (Refereed) Published
Abstract [en]

In this article we report our findings on the electronic structure of the Li induced Ge(1 1 1)–3 × 1reconstruction as determined by angle-resolved ultraviolet photoelectron spectroscopy (ARUPS) and core-level spectroscopy using synchrotron radiation. The results are compared to the theoretical honeycomb-chain-channel (HCC) model for the 3 × 1reconstruction as calculated using density functional theory (DFT). ARUPS measurements were performed in both the and directions of the 1 × 1 surface Brillouin zone at photon energies of 17 and 21.2 eV. Three surface related states were observed in the direction. In the direction, at least two surface states were seen. The calculated band structure using the single-domain HCC model for Li/Ge(1 1 1)–3 × 1 was in good agreement with experiment, allowing for the determination of the origin of the experimentally observed surface states. In the Ge core-level spectra, two surface related components were identified, both at lower binding energy with respect to the Ge bulk peak. Our DFT calculations of the surface core-level shifts were found to be in fair agreement with the experimental results. Finally, in contrast to the Li/Si(1 1 1)–3 × 1 case, no double bond between Ge atoms in the top layer was found

Place, publisher, year, edition, pages
Elsevier, 2009
Keywords
Synchrotron radiation photoelectron spectroscopy Angle-resolved photoemission Density functional calculations Surface structure Electronic structure Germanium Lithium
National Category
Physical Sciences Condensed Matter Physics
Research subject
Physics
Identifiers
urn:nbn:se:kau:diva-11009 (URN)10.1016/j.susc.2009.01.019 (DOI)
Funder
Swedish Research Council
Available from: 2012-02-08 Created: 2012-02-08 Last updated: 2019-07-12Bibliographically approved
Garcia, J. & Holleboom, T. J. (2009). Retention of Micro-fragments in Cluster Slack: A First Model. In: First IEEE International Workshop on Information Forensics and Security (WIFS 2009): . Paper presented at IEEE Workshop on Information Forensics and Security (WIFS), 6-9 Dec. 2009 (pp. 31-35). London, UK: IEEE Signal Processing Society
Open this publication in new window or tab >>Retention of Micro-fragments in Cluster Slack: A First Model
2009 (English)In: First IEEE International Workshop on Information Forensics and Security (WIFS 2009), London, UK: IEEE Signal Processing Society, 2009, p. 31-35Conference paper, Published paper (Refereed)
Abstract [en]

In current forensic practice it is regularly needed to determine whether some set of files have been present on a storage medium or not. File carving techniques are readily used as a tool in such examinations. However, if all clusters holding the files searched for have been overwritten, remains of the previous files only resides in the cluster slack. In this work we elaborate on the factors that influence how many such cluster slack ¿micro-fragments¿ that can be expected to be detected. We identify a set of factors that influence the micro-fragment retention characteristics. One such characteristic is the file size distribution of the files overwriting the original files. We derive analytical expressions for three different file size distributions, which allows us to examine the retention characteristics even if the overwriting files come from different sources.

Place, publisher, year, edition, pages
London, UK: IEEE Signal Processing Society, 2009
National Category
Computer Sciences
Research subject
Computer Science
Identifiers
urn:nbn:se:kau:diva-11304 (URN)10.1109/WIFS.2009.5386487 (DOI)978-1-4244-5279-8 (ISBN)978-1-4244-5280-4 (ISBN)
Conference
IEEE Workshop on Information Forensics and Security (WIFS), 6-9 Dec. 2009
Available from: 2012-02-08 Created: 2012-02-08 Last updated: 2019-07-12Bibliographically approved
Lundin, R., Lindskog, S. & Holleboom, T. (2007). On the Relationship between Confidentiality Measures: Entropy and Guesswork. In: Mariemma Inmaculada Yagüe del Valle and Eduardo Fernández-Medina (Ed.), WOSIS. Paper presented at Proceedings of the 5th International Workshop on Security in Information Systems (WOSIS 2007), In conjunction with ICEIS 2007, Funchal, Madeira, Portugal, June 2007 (pp. 135-144). INSTICC Press
Open this publication in new window or tab >>On the Relationship between Confidentiality Measures: Entropy and Guesswork
2007 (English)In: WOSIS / [ed] Mariemma Inmaculada Yagüe del Valle and Eduardo Fernández-Medina, INSTICC Press , 2007, p. 135-144Conference paper, Published paper (Refereed)
Abstract [en]

In this paper, we investigate in detail the relationship between entropy and guesswork. The aim of the study is to lay the ground for future efficiency comparison of guessing strategies. After a short discussion of the two measures, and the differences between them, the formal definitions are given. Then, a redefinition of guesswork is made, since the measure is not completely accurate. The change is a minor modification in the last term of the sum expressing guesswork. Finally, two theorems are stated. The first states that the redefined guesswork is equal to the concept of cross entropy, and the second states, as a consequence of the first theorem, that the redefined guesswork is equal to the sum of the entropy and the relative entropy.

Place, publisher, year, edition, pages
INSTICC Press, 2007
National Category
Computer Sciences
Research subject
Computer Science
Identifiers
urn:nbn:se:kau:diva-1916 (URN)978-972-8865-96-2 (ISBN)
Conference
Proceedings of the 5th International Workshop on Security in Information Systems (WOSIS 2007), In conjunction with ICEIS 2007, Funchal, Madeira, Portugal, June 2007
Available from: 2007-10-09 Created: 2007-10-09 Last updated: 2019-07-12Bibliographically approved
Holleboom, T. J. (2005). Classification and Analysis of Errors in Wide Area Networks. Paper presented at Promote IT 2005, Borlänge, Sweden, May 11-13, 2005. Paper presented at Promote IT 2005, Borlänge, Sweden, May 11-13, 2005.
Open this publication in new window or tab >>Classification and Analysis of Errors in Wide Area Networks
2005 (English)Conference paper, Published paper (Refereed)
Abstract [en]

The error logs of routers in a WAN contain huge amounts of information about the functioning of individual components in the network. Errors may induce other errors and possibly chains

of errors. An attempt is made to classify and analyse certain chains of errors. Such a systematic approach will hopefully lead to improved possibilities for detecting malfunctioning components. Test have been performed on log data generated in SUNET. Results are presented and discussed.

National Category
Computer Sciences
Research subject
Computer Science
Identifiers
urn:nbn:se:kau:diva-17694 (URN)
Conference
Promote IT 2005, Borlänge, Sweden, May 11-13, 2005
Available from: 2013-01-21 Created: 2013-01-21 Last updated: 2019-07-12
Organisations
Identifiers
ORCID iD: ORCID iD iconorcid.org/0000-0003-0861-2813

Search in DiVA

Show all publications