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| 1 | Experimental and numerical study of the fragmentation of expanding warhead casings by using different numerical codes and solution techniques显示文摘There has been increasing interest in numerical simulations of fragmentation of expanding warheads in 3D.Accordingly there is a pressure on developers of leading commercial codes,such as LS-DYNA.AUTODYN and IMPETUS Afea.to implement the reliable fracture models and the efficient solution techniques.The applicability of the Johnson—Cook strength and fracture model is evaluated by comparing the fracture behaviour of an expanding steel casing of a warhead with experiments.The numerical codes and different numerical solution techniques,such as Eulerian,Lagrangian.Smooth particle hydrodynamics(SPH).and the corpuscular models recently implemented in IMPETUS Afea are compared.For the same solution techniques and material models we find that the codes give similar results.The SPH technique and the corpuscular technique are superior to the Eulerian technique and the Lagrangian technique(with erosion) when it is applied to materials that have fluid like behaviour such as the explosive and the tracer.The Eulerian technique gives much larger calculation time and both the Lagrangian and Eulerian techniques seem to give less agreement with our measurements.To more correctly simulate the fracture behaviours of the expanding steel casing,we applied that ductility decreases with strain rate.The phenomena may be explained by the realization of adiabatic shear bands.An implemented node splitting algorithm in IMPETUS Afea seems very promising. | John F.MOXNES Anne K.PRYTZ Фyvind FRФYLAND Siri KLOKKEHAUG Stian SKRIUDALEN Eva FRIIS Jan A.TELAND Cato DФRUM Gard ФDEGARDSTUEN | 2014 | Defence Technology(防务技术)2014，10，2： | 12 |
| 2 | Unique,Persistent,Resolvable:Identifiers as the Foundation of FAIR显示文摘The FAIR principles describe characteristics intended to support access to and reuse of digital artifacts in the scientific research ecosystem.Persistent,globally unique identifiers,resolvable on the Web,and associated with a set of additional descriptive metadata,are foundational to FAIR data.Here we describe some basic principles and exemplars for their design,use and orchestration with other system elements to achieve FAIRness for digital research objects. | Nick Juty Sarala M.Wimalaratne Stian Soiland-Reyes John Kunze Carole A.Goble Tim Clark | 2020 | Data Intelligence2020，2，1： | 11 |
| 3 | On the study of ricochet and penetration in sand,water and gelatin by spheres,7.62 mm APM2,and 25 mm projectiles显示文摘We examine the ricochet and penetration behavior in sand, water and gelatin by steel spheres, 7.62 mm APM2 and 25 mm projectiles. A threshold impact angle(critical angle) exists beyond which ricochet cannot occur. The Autodyn simulation code with the smooth particle hydrodynamic(SPH) method and Impetus Afea Solver with the corpuscular model are used and the results are compared with experimental and analytical results. The resistance force in sand for spheres was proportional to a term quadratic in velocity plus a term linear in velocity. The drag coefficient for the quadratic term was 0.65. The Autodyn and Impetus Afea codes simulate too large penetration due to the lack of a linear velocity resistance force. Critical ricochet angles were consistent with analytical results in the literature. In ballistic gelatin at velocities of 50–850 m/s a drag coefficient of 0.30 fits the high speed camera recordings if a linear velocity resistance term is included. However, only a quadratic velocity resistance force with drag coefficient that varies with the Reynolds number also fits the measurements. The simulation of a sphere in water with Autodyn showed too large drag coefficient. The 7.62 mm APM2 core simulations in sand fit reasonable well for both codes. The 25 mm projectile ricochet simulations in sand show consistency with the high speed camera recordings. Computer time was reduced by one to two orders of magnitudes when applying the Impetus Afea Solver compared to Autodyn code due to the use of the graphics processing units(GPU). | John F.MOXNES ∅yvind FR∅YLAND Stian SKRIUDALEN Anne K.PRYTZ Jan A.TELAND Eva FRIIS Gard ∅DEGARDSTUEN | 2016 | Defence Technology(防务技术)2016，12，2： | 6 |
| 4 | Strain rate dependency and fragmentation pattern of expanding warheads显示文摘For the characterization of the behaviors of a metal material in events like expanding warheads, it is necessary to know its strength and ductility at high strain rates, around 104e105/s. The flyer plate impact testing produces the uniform stress and strain rates but the testing is expensive. The Taylor test is relatively inexpensive but produces non-uniform stress and strain fields, and the results are not so easily inferred for material modeling. In the split-Hopkinson bar(SHB), which may be used in compression, tension and torsion testing, the strain rates never exceeds 103/s. In the present work, we use the expanding ring test where the strain rate is 104e105/s. A streak camera is used to examine the expanding ring velocity, and a water tank is used to collect the fragments. The experimental results are compared with the numerical simulations using the hydrocodes AUTODYN, IMPETUS Afea and a regularized smooth particle(RSPH) software. The number of fragments increases with the increase in the expansion velocity of the rings. The number of fragments is similar to the experimental results. The RSPH software shows much the same results as the AUTODYN where the Lagrangian solver is used for the ring. The IMPETUS Afea solver shows a somewhat different fragmentation characteristic due to the node splitting algorithm that induces pronounced tensile splitting. | John F.MOXNES Anne K.PRYTZ Фyvind FR?YLAND Stian SKRIUDALEN Steinar BФRVE Gard ФDEGARDSTUEN | 2015 | Defence Technology(防务技术)2015，11，1： | 5 |
| 5 | FAIR Computational Workflows显示文摘Computational workflows describe the complex multi-step methods that are used for data collection,data preparation,analytics,predictive modelling,and simulation that lead to new data products.They can inherently contribute to the FAIR data principles:by processing data according to established metadata;by creating metadata themselves during the processing of data;and by tracking and recording data provenance.These properties aid data quality assessment and contribute to secondary data usage.Moreover,workflows are digital objects in their own right.This paper argues that FAIR principles for workflows need to address their specific nature in terms of their composition of executable software steps,their provenance,and their development. | Carole Goble Sarah Cohen-Boulakia Stian Soiland-Reyes Daniel Garijo Yolanda Gil Michael R.Crusoe Kristian Peters Daniel Schober | 2020 | Data Intelligence2020，2，1： | 3 |
| 6 | The oral commensal Streptococcus mitis activates the aryl hydrocarbon receptor in human oral epithelial cells显示文摘Streptococcus mitis(S. mitis) is a pioneer commensal bacterial species colonizing many of the surfaces of the oral cavity in healthy individuals. Yet, not much information is available regarding its interaction with the host. We used examination of its transcriptional regulation in oral keratinocytes to elucidate some of its potential roles in the oral cavity. Transcription factor analysis of oral keratinocytes predicted S. mitis-mediated activation of aryl hydrocarbon receptor(Ah R). Activation and functionality of Ah R was confirmed through nuclear translocation determined by immunofluorescence microscopy and real-time polymerase chain reaction with reverse transcription analysis of CYP1A1, the hallmark gene for Ah R activation. Addition of Streptococcus mutans or Streptococcus gordonii did not induce CYP1A1 transcription in the keratinocyte cultures. Introduction of an Ah R-specific inhibitor revealed that S. mitis-mediated transcription of CXCL2 and CXCL8 was regulated by Ah R. Elevated levels of prostaglandin E2(enzyme-linked immunosorbent assay) in supernatants from S. mitis-treated oral epithelial cells were also attenuated by inhibition of Ah R activity. The observed Ah R-regulated activities point to a contribution of S. mitis in the regulation of inflammatory responses and thereby to wound healing in the oral cavity. The concept that the oral commensal microbiota can induce Ah R activation is important, also in view of the role that Ah R has in modulation of T-cell differentiation and as an anti-inflammatory factor in macrophages. | stian a engen gro h rørvik olav schreurs inger js blix karl schenck | 2017 | International Journal of Oral Science2017，9，3： | 2 |
| 7 | Experimental Validation of a New Ultrasound Method for the Simultaneous Assessment of Radial and Longitudinal Myocardial Deformation Independent of Insonation Angle显示文摘 | Stian Langeland Jan D’hooge Patrick F. Wouters H Alex Leather Piet Claus Bart Bijnens George R. Sutherland | 2005 | Circulation2005，，14： | 2 |
| 8 | Assessing the acid properties of desilicated ZSM-5 by FTIR using CO and 2,g,6-trimethypyridine (collidine) as molecular probes显示文摘 | Martin S H Stian S Finn J | 2009 | Appl Catal A2009，356，： | 1 |
| 9 | A stationary wavelet-domain wiener filter for correlated speckle显示文摘 | Stian S Torbjorn E | 2008 | IEEE Transactions on Geoscience and Remote Sensing2008，46，4： | 1 |
| 10 | A stationary wavelet-domain wiener filter for correlated speckle显示文摘 | Stian Solb Torbjrn Eltoft | 2008 | IEEE Transactions on Geoscience and Remote Sensing2008，46，4： | 1 |
| 11 | Conversion of methanol into hydrocarbons over zeolite H-ZSM-5: ethene formation is mechanistically separated from the formation of higher alkenes 显示文摘 | Stian Svelle Finn Joensen Jesper Nerlov | 2006 | J Am Chem Soc2006，128，14： | 1 |
| 12 | Mechanistic in- sight into the methanol to hydrocarbons reaction 显示文摘 | UNNI O MORTEN B STIAN S | 2009 | Ca- talysis Today2009，106，1： | 1 |
| 13 | Conversion of meth- anol to hydrocarbons over zeolite H-ZSM-5: On the origin of the olefinic species 显示文摘 | MORTEN B STIAN S FINN J | 2007 | Journal of Catalysis2007，249，2： | 1 |
| 14 | Conversion of methanol to hydrocarbons over zeolite H-ZSM-5:On the origin of the olefinic species 显示文摘 | Bjorgcn Morten Svelle Stian Joensen Finn | 2007 | Journal of Catalysis2007，249，2： | 1 |
| 15 | Product shape selectivity dominates the Methanol-to-Olefins (MTO) reaction over H-SAPO-34 catalysts显示文摘 | Bart P.C. Hereijgers Francesca Bleken Merete H. Nilsen Stian Svelle Karl-Petter Lillerud Morten Bj?rgen Bert M. Weckhuysen Unni Olsbye | 2009 | Journal of Catalysis2009，，1： | 1 |
| 16 | 一种面向高异质性极化SAR图像的等效视数非监督估计方法显示文摘等效视数(ENL)是极化SAR多视数据统计模型的重要参数。而一些极化SAR图像的自动化应用中,需要在没有人工干预下实现ENL非监督估计。现有的等效视数非监督估计方法在异质程度较高的图像中就难以得到准确估计结果。针对这一问题,该文提出一种将混合区域剔除与纹理信息聚类相结合的等效视数非监督估计方法,有效地减弱了地物混合及纹理两类主要异质因素对估计结果的影响。通过仿真数据和不同复杂度的实际图像验证了该方法的有效性。 | 胡丁晟 仇晓兰 Stian N.Anfinsen 雷斌 | 2017 | 电子与信息学报2017，39，10： | 1 |
| 17 | The role of standardization in safety management--A case study of amajor oil&gas company显示文摘 | Antonsen Stian Skarholt Kari Ringstad ArneJarl | 2010 | Safety Science2010，50，10： | 1 |
| 18 | Safety culture and the issue of power 显示文摘 | Stian Antonsen | 2009 | Safety Science2009，47，2： | 1 |
| 19 | Reactive power capability of wind tur- bines based on doubly fed induction generators 显示文摘 | STEPHAN ENGELHARDT ISTVAN ERLICH CHRI- STIAN FELTES | 2011 | IEEE2011，26，1： | 1 |
| 20 | A stationary wavelet do-main wiener filter for correlated speckle显示文摘 | STIAN S TORBJORN E | 2008 | IEEETransactions on Geoscience and Remote Sensing2008，46，4： | 1 |
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