James S. Stolken

Portrait of James S. Stolken

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  • Title
    Materials Scientist
  • Email
    stolken1@llnl.gov
  • Phone
    (925) 423-2234
  • Organization
    Not Available

James Stölken is a materials scientist with extensive experience developing, leading, and managing all aspects of original research programs. Dr. Stölken currently leads a multidisciplinary effort to set directed energy system requirements for defense applications. He has served as the Debris and Shrapnel Working Group Leader for the National Ignition Facility; directing teams of scientists and engineers to assess and mitigate the debris and shrapnel risk of several critical experimental campaigns. His research covers a broad range of subjects from material strength at high-pressure and multiscale plasticity modeling to grain-boundary engineering and the failure and fracture of materials from aerospace alloys to mineralized tissue. Dr. Stölken’s technical contributions to these interdisciplinary projects has been to develop and apply new computational and analytical methods, often working to design and execute complementary experimental programs.

Dr. Stölken has authored or co-authored 60 peer-reviewed publications in 23 different journals and has contributed 80 technical presentations (17 invited) to major U.S. and International conferences. He earned a B.S. (Honors) in Materials Science and Engineering from U.C. Berkeley and a Ph.D. in Materials from U.C. Santa Barbara. Prior to attending university, Dr. Stölken served aboard a Trident nuclear submarine and led a nuclear repair division while serving in the U.S. Navy. His awards include: two U.S. Navy Citations, an Achievement Reward for College Scientists, the U.C. Berkeley Materials Department Citation, and several LLNL awards for outstanding service and publications.

RESEARCH INTERESTS

Explosive and laser-driven fracture and fragmentation. Thermomechanical processing of materials. Dynamically driven phase transformations. Poly-crystalline constitutive theory, modeling, and experiments. Laser processing of materials. Nonlinear mechanics, micro-mechanics, bifurcation, and post-buckling response. Damage mechanics and failure of composite materials. Radiation transport modeling. Biomechanics and fracture of mineralized tissue.

PROJECTS

Directed Energy Lethality Project Systems Engineer: Lead a multidisciplinary effort to set directed energy system requirements for a major government acquisition program through an experimentally driven modeling and simulation approach. Define, plan, and, supervise the execution of experimental campaigns. Identify, develop, and coordinate HPC simulation capability development and execution. (5.1M$/yr) 2012-Present.

NIF Debris and Shrapnel Working Group Leader: Lead integrated teams of scientists and engineers to assess and mitigate the debris and shrapnel risk of several HED & NIC Campaign experimental platforms and advanced diagnostics including RT-Strength and TARDIS. (2.2M$/yr). 2010-2013.

Integrated Modeling of Laser Damage Mitigation Processes: A multidisciplinary effort combining experiments and computations to develop improved laser damage mitigation protocols. Experiments include high-resolution dynamic thermal imaging and photo-elastic stress measurement coupled to advanced thermal transport and material models. Co-Investigator. (2M$/yr) 2007-2010.

The UltraFast Lattice Response of the Shocked Solid: Developed algorithms and analysis software for advanced X-ray diffraction diagnostics. Resulting in the first, direct, in situ, observation of a shocked induced phase transition in iron. Co-Investigator ($1.8M$/yr) 2005-2010.

Advanced Radiative Heat Transport Model Development: Development of three-dimensional radiative thermal transport models for semi-transparent materials. Principle Investigator. (360K$/yr). 2007-2010.

Material Strength at High Pressure: Designed novel plate-impact experiments to probe dynamic strength at high pressure. Developed new analysis techniques to reduce heterodyne interferometer data and extract the dynamic stress/strain response under weak shock loading. Co-Investigator. (600K$/yr) 2006-2009.

Computational Analysis of Laser Glass Damage Processes: Developed coupled, three-dimensional electromechanical simulations that models laser energy deposition and subsequent material hydrodynamic response. Principle Investigator. (120K$/yr) 2006-07.

Nano-Barometers - An in situ Diagnostic for High Pressure Experiments: Develop, calibrate, and test a new class of embedded pressure sensor with high spatial resolution over a range of pressures from 30 to 300 kbar. Filed Record of Invention. Principle Investigator. (240K$/yr) 2005-2006.

Dynamics of Metals Program - Mesoscale Plasticity: Formulate physics-based, constitutive relations for metallic single, and polycrystals required for the Mechanical Properties sub-thrust of the Dynamics of Metals program. Principle Investigator (420K$/yr) 2000-2003.

A Study on the Role of Grain Boundary Engineering in Promoting High-Cycle Fatigue Resistance and Improving Reliability in Metallic Alloys for Propulsion Systems: Develop mesoscale plasticity simulations to elucidate microstructural effects on fracture. A joint U.C. Berkeley and LLNL project from the U.S. Air Force Office of Science and Technology. Co-Investigator. (200K$/yr) 2003-2004.

Biomechanics of Human Dentin: Develop high fidelity finite element simulations and material models of damage and fracture of mineralized tissue. A multi-institutional project including UCSF, UCB, LLNL, and other institutions. Key Contributor. (1400K$/yr) 2002-2004.

EXPERIENCE: Military (11/81-4/88), Civilian (4/88-Present).

12/97-Present: Staff Scientist, Lawrence Livermore National Laboratory. Conceive, develop, and deliver internally and externally funded multidisciplinary scientific projects. Supervise scientific teams conducting complex experiments and performing large-scale multiphysics computer simulations. Design laboratory experiments and develop computational tools for data analysis. Formulate physics-based computational models of complex physical systems. Author scientific papers and research presentations.

7/92-12/97: Research Assistant, University of California at Santa Barbara. Plan and conduct experiments to study the influence of impurities upon the fracture behavior of metal-ceramic interfaces. Fabricate, process, test and analyze multilayer interfaces. Design, build, and test specialized mechanical test equipment. Write detailed reports and make oral presentations.

6/90-6/92: Engineering Aid, Lawrence-Berkeley National Laboratory. Devise computer simulations of viscous flow and diffusion processes in glasses and ceramics. Implement finite element computer programs on engineering workstations, mainframe, and super-computers.

5/86-1/88: Division Leader, USS DIXON (AS-37). Directly supervise the thirty-nine personnel of the Radiological Controls Division. Responsible for the radiological controls associated with the reactor-plant repairs of the ten submarines assigned to Squadron Three. Plan, organize, and execute complex nuclear reactor repair projects.

1/84-3/86: Engine Room Supervisor, USS FLORIDA (SSBN-728-BLUE). Supervise and coordinate engine room evolutions and repairs as required in the operation of the nuclear propulsion plant. Responsible for the chemistry controls of the nuclear propulsion plant.

SKILLS

  • Materials Processing: E-beam deposition, mask design, photolithography, oxide thin-film growth, diffusion bonding, high-temperature controlled atmosphere annealing and hot pressing.
  • Materials Testing: Mechanical testing of metals, ceramics, and composites. Fracture toughness testing of metal-ceramic and thin-film ceramic interfaces using computer-controlled test equipment.
  • Materials Analysis: SEM, XRD, EDS, interferometry, strain mapping, con focal and Nomarski microscopy.
  • Computation: Finite element, finite difference, weighted-residual and spectral methods. Non-linear optimization.
  • Statistics: Design of Experiments, ANOVA, regression analysis, robust statistics, and cluster analysis, bootstrap simulation.
  • Software: Unix, X-Windows, MS-Windows, Windows-NT, Mac OS, AutoCAD, MS-Word, MS-Excel, LaTeX.
  • Programming: C++, C, FORTRAN, Mathematica, R+, Mat-Lab, Python, Perl, IDL.

Ph.D. in Materials, University of California at Santa Barbara 12/97; Emphasis: Metal-Ceramic Interface Bonding and Fracture

B.S. (with Honors) in Materials Science and Engineering, University of California at Berkeley 5/92; Minor: Structural Engineering

Transfer Curriculum, Antelope Valley College, Lancaster CA 12/89; Engineering: 60 units

Engineering Laboratory Technician, Naval Nuclear Propulsion School 8/83

  1. LINDL, J. D., LANDEN, O. L., EDWARDS, J. et. al. 2014. Review of the National Ignition Campaign 2009-2012. Physics of Plasmas, 21, 020501.
  2. MASTERS, N. D., FISHER, A., KALANTAR, D., PRASAD, R., STOELKEN, J. S., WLODARCZYK, C. 2014. Evaluation of observed blast loading effects on NIF x-ray diagnostic collimators. Review of Scientific Instruments, 85, 11D628.
  3. SULLIVAN, K. T., SWIFT, D., BARHAM, M., STOELKEN, J., KUNTZ, J. & KUMAR, M. 2014. Shock compression behavior of bi-material powder composites with disparate melting temperatures. Journal of Applied Physics, 115.
  4. VIGNES, R. M., SOULES, T. F., STOLKEN, J. S., SETTGAST, R. R., ELHADJ, S. & MATTHEWS, M. J. 2013. Thermomechanical Modeling of Laser-Induced Structural Relaxation and Deformation of Glass: Volume Changes in Fused Silica at High Temperatures. Journal of the American Ceramic Society, 96, 137-145.
  5. VIGNES, R. M., BECKER, R., STOELKEN, J. & KUMAR, M. 2013. An assessment of diamond anvil cell measurements on material strength. Journal of Applied Physics, 113.
  6. MASON, J. K., JOHNSON, O. K., REED, B. W., LI, S. F., STOLKEN, J. S. & KUMAR, M. 2013. Statistics of twin-related domains and the grain boundary network. Acta Materialia, 61, 6524-6532.
  7. SOULES, T. F., GILMER, G. H., MATTHEWS, M. J., STOLKEN, J. S. & FELT, M. D. 2011. Silica Molecular Dynamic Force Fields - a Practical Assessment (vol 357, pg 1564, 2011). Journal of Non-Crystalline Solids, 357, 3046-3046.
  8. SOULES, T. F., GILMER, G. H., MATTHEWS, M. J., STOLKEN, J. S. & FEIT, M. D. 2011. Silica molecular dynamic force fields-A practical assessment. Journal of Non-Crystalline Solids, 357, 1564-1573.
  9. SHESTAKOV, A. I., VIGNES, R. M. & STOELKEN, J. S. 2011. Derivation and solution of multifrequency radiation diffusion equations for homogeneous refractive lossy media. Journal of Computational Physics, 230, 984-999.
  10. REED, B. W., STOLKEN, J. S., MINICH, R. W. & KUMAR, M. 2011. A unified approach for extracting strength information from nonsimple compression waves. Part I: Thermodynamics and numerical implementation. Journal of Applied Physics, 110.
  11. REED, B. W., PATTERSON, J. R., SWIFT, D. C., STOLKEN, J. S., MINICH, R. W. & KUMAR, M. 2011. A unified approach for extracting strength information from nonsimple compression waves. Part II. Experiment and comparison with simulation. Journal of Applied Physics, 110.
  12. GUPTA, A., STEIGMANN, D. J. & STOELKEN, J. S. 2011. Aspects of the Phenomenological Theory of Elastic-Plastic Deformation. Journal of Elasticity, 104, 249-266.
  13. ELHADJ, S., MATTHEWS, M., YANG, S., COOKE, D., STOLKEN, J. & FEIT, M. 2011. Evaporation kinetics of CO2 laser heated fused silica. Abstracts of Papers of the American Chemical Society, 241.
  14. COLVIN, J., SHESTAKOV, A., STOELKEN, J. & VIGNES, R. 2011. The role of radiation transport in the thermal response of semitransparent materials to localized laser heating. Journal of Applied Physics, 109.
  15. SOULES, T. F., GILMER, G. H., MATTHEWS, M. J., STOLKEN, J. S. & FEIT, M. D. 2010. An Assessment of Molecular Dynamic Force Fields for Silica for Use in Simulating Laser Damage Mitigation. Laser-Induced Damage in Optical Materials: 2010, 7842.
  16. MATTHEWS, M. J., VIGNES, R. M., COOKE, D., YANG, S. T. & STOLKEN, J. S. 2010. Analysis of microstructural relaxation phenomena in laser-modified fused silica using confocal Raman microscopy. Optics Letters, 35, 1311-1313.
  17. FEIT, M. D., MATTHEWS, M. J., SOULES, T. F., STOLKEN, J. S., VIGNES, R. M., YANG, S. T. & COOKE, J. D. 2010. Densification and residual stress induced by CO(2) laser-based mitigation of SiO(2) surfaces. Laser-Induced Damage in Optical Materials: 2010, 7842.
  18. ELHADJ, S., MATTHEWS, M. J., YANG, S. T., COOKE, D. J., STOLKEN, J. S., VIGNES, R. M., DRAGGOO, V. G. & BISSON, S. E. 2010. Determination of the intrinsic temperature dependent thermal conductivity from analysis of surface temperature of laser irradiated materials. Applied Physics Letters, 96.
  19. CHAU, R., STOLKEN, J., ASOKA-KUMAR, P., KUMAR, M. & HOLMES, N. C. 2010. Shock Hugoniot of single crystal copper. Journal of Applied Physics, 107.
  20. REED, B. W., MINICH, R. W., STOLKEN, J. S. & KUMAR, M. 2009. FREE SURFACE VELOCIMETRY CORRECTIONS FOR LOW PRESSURE SHOCKS. In: ELERT, M. L., BUTTLER, W. T., FURNISH, M. D., ANDERSON, W. W. & PROUD, W. G. (eds.) Shock Compression of Condensed Matter - 2009, Pts 1 and 2.
  21. MATTHEWS, M. J., STOLKEN, J. S., VIGNES, R. M., NORTON, M. A., YANG, S., COOKE, J. D., GUSS, G. M. & ADAMS, J. J. 2009. Residual stress and damage-induced critical fracture on CO 2 laser treated fused silica. Proceedings of the SPIE - The International Society for Optical Engineering, 7504, 750410 (12 pp.)-750410 (12 pp.).
  22. HAWRELIAK, J. A., KALANTAR, D. H., STOELKEN, J. S., REMINGTON, B. A., LORENZANA, H. E. & WARK, J. S. 2008. High-pressure nanocrystalline structure of a shock-compressed single crystal of iron. Physical Review B, 78.
  23. BARTY, A., MARCHESINI, S., CHAPMAN, H. N., CUI, C., HOWELLS, M. R., SHAPIRO, D. A., MINOR, A. M., SPENCE, J. C. H., WEIERSTALL, U., ILAVSKY, J., NOY, A., HAU-RIEGE, S. P., ARTYUKHIN, A. B., BAUMANN, T., WILLEY, T., STOLKEN, J., VAN BUUREN, T. & KINNEY, J. H. 2008. Three-dimensional coherent x-ray diffraction imaging of a ceramic nanofoam: Determination of structural deformation mechanisms. Physical Review Letters, 101.
  24. RITCHIE, R. O., YONG, G., STOLKEN, J. S. & KUMAR, M. 2007. High-cycle fatigue of nickel-base superalloy Rene 104 (ME3): Interaction of microstructurally small cracks with grain boundaries of known character. Acta Materialia, 55, 3155-67.
  25. HAWRELIAK, J., COLVIN, J., EGGERT, J., KALANTAR, D. H., LORENZANA, H. E., POLLAINE, S., ROSOLANKOVA, K., REMINGTON, B. A., STOLKEN, J. & WARK, J. S. 2007. Modeling planetary interiors in laser based experiments using shockless compression. Astrophysics and Space Science, 307, 285-289.
  26. GUPTA, A., STEIGMANN, D. J. & STOLKEN, J. S. 2007. On the evolution of plasticity and incompatibility. Mathematics and Mechanics of Solids, 12, 583-610.
  27. GAO, Y., STOLKEN, J. S., KUMAR, M. & RITCHIE, R. O. 2007. High-cycle fatigue of nickel-base superalloy Rene 104 (ME3): Interaction of microstructurally small cracks with grain boundaries of known character. Acta Materialia, 55, 3155-3167.
  28. KALANTAR, D. H., COLLINS, G. W., COLVIN, J. D., EGGERT, J. H., HAWRELIAK, J., LORENZANA, H. E., MEYERS, M. A., MINICH, R. W., ROSOLANKOVA, K., SCHNEIDER, M. S., STOELKEN, J. S. & WARK, J. S. 2006. In situ diffraction measurements of lattice response due to shock loading, including direct observation of the alpha-epsilon phase transition in iron. International Journal of Impact Engineering, 33, 343-352.
  29. KALANTAR, D. H., COLLINS, G. W., COLVIN, J. D., DAVIES, H. M., EGGERT, J. H., HAWRELIAK, J., LORENZANA, H. E., MEYERS, M. A., ROSOLANKOVA, K., SCHNEIDER, M. S., SHEPPARD, J., STOELKEN, J. S. & WARK, J. S. 2006. Direct observation of the alpha-epsilon transition in shocked single crystal iron. In: FURNISH, M. D., ELERT, M., RUSSELL, T. P. & WHITE, C. T. (eds.) Shock Compression of Condensed Matter - 2005, Pts 1 and 2.
  30. HAWRELIAK, J., ROSOLANKOVA, K., BELAK, J. F., COLLINS, G., COLVIN, J., DAVIES, H. M., EGGERT, J. H., GERMANN, T. C., HOLIAN, B., KALANTAR, D. H., KADAU, K., LOMDAHL, P., LORENZANA, H. E., SHEPPARD, J., STOLKEN, J. S. & WARK, J. S. 2006. Shock induced alpha-epsilon phase change in iron: Analysis of MD simulations and experiment. In: FURNISH, M. D., ELERT, M., RUSSELL, T. P. & WHITE, C. T. (eds.) Shock Compression of Condensed Matter - 2005, Pts 1 and 2.
  31. HAWRELIAK, J., COLVIN, J. D., EGGERT, J. H., KALANTAR, D. H., LORENZANA, H. E., STOLKEN, J. S., DAVIES, H. M., GERMANN, T. C., HOLIAN, B. L., KADAU, K., LOMDAHL, P. S., HIGGINBOTHAM, A., ROSOLANKOVA, K., SHEPPARD, J. & WARK, J. S. 2006. Analysis of the x-ray diffraction signal for the alpha-epsilon transition in shock-compressed iron: Simulation and experiment. Physical Review B, 74.
  32. ZIEGLER, A., CAMPBELL, G. H., KUMAR, M. & STOLKEN, J. S. 2005. Effect of the grain boundary on the evolution of deformation in a bicrystal. Journal of Materials Science, 40, 3225-3229.
  33. NALLA, R. K., STOLKEN, J. S., KINNEY, J. H. & RITCHIE, R. O. 2005. Fracture in human cortical bone: local fracture criteria and toughening mechanisms. Journal of Biomechanics, 38, 1517-1525.
  34. KINNEY, J. H., STOLKEN, J. S., SMITH, T. S., RYABY, J. T. & LANE, N. E. 2005. An orientation distribution function for trabecular bone. Bone, 36, 193-201.
  35. KALANTAR, D. H., BELAK, J. F., COLLINS, G. W., COLVIN, J. D., DAVIES, H. M., EGGERT, J. H., GERMANN, T. C., HAWRELIAK, J., HOLIAN, B. L., KADAU, K., LOMDAHL, P. S., LORENZANA, H. E., MEYERS, M. A., ROSOLANKOVA, K., SCHNEIDER, M. S., SHEPPARD, J., STOLKEN, J. S. & WARK, J. S. 2005. Direct observation of the alpha-epsilon transition in shock-compressed iron via nanosecond x-ray diffraction. Physical Review Letters, 95.
  36. REMINGTON, B. A., BAZAN, G., BELAK, J., BRINGA, E., CATURLA, M., COLVIN, J. D., EDWARDS, M. J., GLENDINNING, S. G., IVANOV, D. S., KAD, B., KALANTAR, D. H., KUMAR, M., LASINSKI, B. F., LORENZ, K. T., MCNANEY, J. M., MEYERHOFER, D. D., MEYERS, M. A., POLLAINE, S. M., ROWLEY, D., SCHNEIDER, M., STOLKEN, J. S., WARK, J. S., WEBER, S. V., WOLFER, W. G., YAAKOBI, B. & ZHIGILEI, L. V. 2004. Materials science under extreme conditions of pressure and strain rate. Metallurgical and Materials Transactions a-Physical Metallurgy and Materials Science, 35A, 2587-2607.
  37. KINNEY, J. H. & STOLKEN, J. S. 2004. On Stolken and Kinney (Bone 2003;33(4): 494-504) - Response. Bone, 34, 913-915.
  38. CATURLA, M. J., NIEH, T. G. & STOLKEN, J. S. 2004. Differences in deformation processes in nanocrystalline nickel with low- and high-angle boundaries from atomistic simulations. Applied Physics Letters, 84, 598-600.
  39. BRINGA, E. M., CAZAMIAS, J. U., ERHART, P., STOLKEN, J., TANUSHEV, N., WIRTH, B. D., RUDD, R. E. & CATURLA, M. J. 2004. Atomistic shock Hugoniot simulation of single-crystal copper. Journal of Applied Physics, 96, 3793-3799.
  40. BLOBAUM, K. J. M., STOLKEN, J. S. & KUMAR, M. 2004. Grain boundary engineering of copper shaped-charge. In: SCHUH, C. A., KUMAR, M., CARTER, C. B. & RANDLE, V. (eds.) Interfacial Engineering for Optimized Properties Iii.
  41. ZIEGLER, A., CAMPBELL, G. H., KUMAR, M. & STOLKEN, J. S. 2003. Effects of grain boundary constraint on the constitutive response of tantalum bicrystals. In: ZBIB, H. M., LASSILA, D. H., LEVINE, L. E. & HEMKER, K. J. (eds.) Multiscale Phenomena in Materials-Experiments and Modeling Related to Mechanical Behavior.
  42. STOLKEN, J. S. & KINNEY, J. H. 2003. On the importance of geometric nonlinearity in finite-element simulations of trabecular bone failure. Bone, 33, 494-504.
  43. KUBOTA, A., CATURLA, M. J., STOLKEN, J., SADIGH, B., REYES, S., DE LA RUBIA, T. D. & LATKOWSKI, J. F. 2003. Threats to ICF reactor materials: computational simulations of radiation damage induced topological changes in fused silica. Nuclear Instruments & Methods in Physics Research Section B-Beam Interactions with Materials and Atoms, 202, 88-92.
  44. KALANTAR, D. H., BRINGA, E., CATURLA, M., COLVIN, J., LORENZ, K. T., KUMAR, M., STOLKEN, J., ALLEN, A. M., ROSOLANKOVA, K., WARK, J. S., MEYERS, M. A., SCHNEIDER, M. & BOEHLY, T. R. 2003. Multiple film plane diagnostic for shocked lattice measurements (invited). Review of Scientific Instruments, 74, 1929-1934.
  45. KALANTAR, D. H., BELAK, J., BRINGA, E., BUDIL, K., CATURLA, M., COLVIN, J., KUMAR, M., LORENZ, K. T., RUDD, R. E., STOLKEN, J., ALLEN, A. M., ROSOLANKOVA, K., WARK, J. S., MEYERS, M. A. & SCHNEIDER, M. 2003. High-pressure, high-strain-rate lattice response of shocked materials. Physics of Plasmas, 10, 1569-1576.
  46. BRINGA, E. M., WIRTH, B. D., CATURLA, M. J., STOLKEN, J. & KALANTAR, D. 2003. Metals far from equilibrium: From shocks to radiation damage. Nuclear Instruments & Methods in Physics Research Section B-Beam Interactions with Materials and Atoms, 202, 56-63.
  47. RYABY, J. T., BALOOCH, M., STOLKEN, J. S. & KINNEY, J. H. 2002. A lateral force AFM study of collagen orientation in lamellar bone. Journal of Bone and Mineral Research, 17, 942-942.
  48. KUBOTA, A., CATURLA, M. J., DAVILA, L., STOLKEN, J., SADIGH, B., QUONG, A., RUBENCHIK, A. & FEIT, M. D. 2002. Structural modifications in fused silica due to laser damage induced shock compression. In: EXARHOS, G., GUENTHER, A. H., LEWIS, K. L., SOILEAU, M. J. & STOLZ, C. J. (eds.) Laser-Induced Damage in Optical Materials: 2001 Proceedings.
  49. SCHWARTZ, A. J., STOLKEN, J. S., KING, W. E. & CAMPBELL, G. H. 2001. Lattice rotations during compression deformation of a 011 Ta single crystal. Materials Science and Engineering a-Structural Materials Properties Microstructure and Processing, 317, 77-84.
  50. RHEE, M., STOLKEN, J. S., BULATOV, V. V., DE LA RUBIA, T. D., ZBIB, H. M. & HIRTH, J. P. 2001. Dislocation stress fields for dynamic codes using anisotropic elasticity: methodology and analysis. Materials Science and Engineering a-Structural Materials Properties Microstructure and Processing, 309, 288-293.
  51. KUBOTA, A., CATURLA, M. J., STOLKEN, J. S. & FEIT, M. D. 2001. Densification of fused silica due to shock waves and its implications for 351 nm laser induced damage. Optics Express, 8, 611-616.
  52. BARNEY, M. M., CAMPBELL, G. H., STOLKEN, J. S., SCHWARTZ, A. J., PLITZKO, J. M., KING, W. E. & MORRIS, J. W., JR. 2001. Experimental assessment of strain gradient plasticity. Multiscale Modeling of Materials-2000. Symposium (Mater. Res. Soc. Symposium Proceedings Vol.653), Z8.6.1-6.
  53. WICKHAM, L. K., SCHWARZ, K. W. & STOLKEN, J. S. 2000. Dislocation forest interactions: simulation and prediction. Multiscale Phenomena in Materials - Experiments and Modeling. Symposium (Materials Research Society Proceedings Vol.578), 125-30.
  54. WICKHAM, L. K., SCHWARZ, K. W. & STOLKEN, J. S. 1999. Rules for forest interactions between dislocations. Physical Review Letters, 83, 4574-4577.
  55. STOLKEN, J. S., KING, W. E., SCHWARTZ, A. J., CAMPBELL, G. H. & BALOOCH, M. 1999. Analysis of anomalous slip in Ta single crystals using optical, atomic force, and orientation imaging microscopies. Advanced Materials for the 21st Century: 1999 Julia R. Weertman Symposium. Proceedings of Symposium. Held during the 1999 TMS Fall Meeting, 59-70.
  56. SCHWARTZ, A. J., KING, W. E., CAMPBELL, G. H., STOLKEN, J. S., LASSILA, D. H., SUN, S. & ADAMS, B. L. 1999. Orientation imaging microscopy investigation of the compression deformation of a 011 Ta single crystal. Journal of Engineering Materials and Technology-Transactions of the Asme, 121, 178-181.
  57. STOLKEN, J. S. & EVANS, A. G. 1998. A microbend test method for measuring the plasticity length scale. Acta Materialia, 46, 5109-5115.
  58. STOLKEN, J. S. & GLAESER, A. M. 1992. THE MORPHOLOGICAL EVOLUTION OF CYLINDRICAL RODS WITH ANISOTROPIC SURFACE FREE-ENERGY VIA SURFACE-DIFFUSION. Scripta Metallurgica Et Materialia, 27, 449-454.

INVITED PRESENTATIONS

  1. Fragmentation Under Extreme Conditions: Applications to Risk Assessment and Diagnostic Development at Mega-Joule Class Laser Facilities. J.S. Stolken, N.D. Masters, A.C. Fisher, B.S. Pudliner, M. Kumar, M.I. Barham, C.A. Smith. March 7, 2013. APS-SCCM/AIRAPT Joint Conference. Seattle WA, United States. July 7-12, 2013.
  2. Plastic Evolution of Solids with Interfaces. A. Gupta, D. J. Steigmann, J. S. Stölken. Presented at: 44th Annual Technical Meeting Society of Engineering Science October 21–24, 2007.
  3. Bone Quality and Vertebral Fracture: A Matter of Scale. J. H. Kinney, J.S. Stolken, R. K. Nalla, R. O. Ritchie. Presented at: NIH Bone quality workshop. Bethesda, MD, United States, May 2-3, 2005. UCRL-ABS-209694
  4. The Importance of Geometric Nonlinearity in Finite Element Studies of Yielding in Trabecular Bone. Kinney, J H, Stölken J S. Presented at: 51st Annual Meeting of the Orthopaedic Research Society, Washington, DC, United States, Feb 20 - Feb 22, 2005. UCRL-PROC-209771
  5. Joint ALS-SSRL Workshop: Probing Mechanical Deformation and Failure via Synchrotron Radiation. Stanford Synchrotron Radiation Laboratory 30th Annual Meeting, 8 Oct. 2003.
  6. Kalantar, D H et al. Large Angle In-Situ Diffraction Measurements of Shocked Single Crystals. 13th American Physical Society on Shock Compression of Condensed Matter, Portland, Or, Jul 20 - Jul 25, 2003.
  7. Mechanics and Computation Division Seminar, Department of Mechanical Engineering, Stanford University, Nov 13, 2002.
  8. Atomistic modeling of spherical shocks. Caturla M.J., Kubota A., Stolken J.S., Mcnaney J.M., Remington B.A., Diaz de la Rubia T. Shock Waves in Condensed Matter, St. Petersburg, Russia, Sep 1-6, 2002.
  9. A Grain Boundary Constraint Effects on the Constitutive Response of TA Bicrystals: Exp & FEA. J. Stölken and G. Campbell. Plasticity 2002. Aruba, Jan 2002.
  10. Stochastic Method for the Evolution of Microstructures with Particular Reference to Grain Boundary Networks. R. Minich, J Stölken, M. Kumar, and C. Schuh. Fall MRS Meeting. Boston, Dec. 2001.
  11. Alteration of the Connectivity of the Grain Boundary Network by Sequential Thermomechanical Processing. M. Kumar, R. Minich, J. Stölken, and W. King. Grain Growth and Recrystallization. Aachen, Aug. 2001.
  12. Symposia on the Mechanisms of Crystal Plasticity, Dislocation Patterning, Dynamic Recovery, Instabilities, and Localization: Flow Localization and Patterning of Plastic Flow in Ductile Crystals. J.L. Bassani, J.S. Stölken and V. Vitek. MIT, May 2001.
  13. European Mechanics of Materials Conference (EMMC5): The Effects of Non-Glide Stresses on Plastic Flow Arising From Non-Planar Dislocation Core Structures, J.L. Bassani, J.S. Stölken, and V. Vitek. Delft, The Netherlands, Mar, 2001.
  14. University of Pennsylvania, Mechanical Engineering Department Seminar: Work Hardening in BCC Metals: Interactions in Dislocation Phase Space. J.S. Stölken, Philadelphia, PA. Mar, 2001.
  15. Conference on Multiscale Simulation, Theoretical, and Experimental Approaches to Deformation, Friction, Fatigue, and Fracture: Multiscale Modeling of Irradiation Damaged Materials. J.S. Stölken and T.D.d.l. Rubia. Baton Rouge, LA. Feb, 2001.
  16. Brown University, Mechanical Engineering Department Seminar: Dislocation Junction Interactions in BCC Metals. J.S. Stölken, Providence, RI. Feb, 2001.
  17. Fundamental Aspects of the Strength of Crystalline Materials ICSMA-12: Complex Macroscopic Plastic Flow due to Non-Planar Core Structures of Dislocations, J.L. Bassani, K. Ito, J.S. Stölken, and V. Vitek. Asilomar, CA, Aug, 2000.

CONFERENCE PRESENTATIONS

  1. Evaluation of Observed Blast Loading Effects on NIF X-ray Diagnostic Collimators. N.D. Masters, A. Fisher, D. Kalantar, R. Prasad, J. Stolken. 20th Topical Conference on High-Temperature Plasma Diagnostics (HTPD 2014) Atlanta, GA, United States. June 1-5, 2014
  2. Radiation multigroup diffusion for refractive, lossy media in ALE3D. A. I. Shestakov, R. M. Vignes, J. S. Stolken. NECDC2010. Los Alamos, NM, United States. October 18-22, 2010.
  3. Silica Molecular Dynamic Force Fields- A Practical Assessment. T, Soules, G. H. Gilmer, M. J. Matthews, J. S. Stolken, M. D. Feit. SPIE 2010. Boulder , CO, United States. September 26-29, 2010.
  4. Extracting Plastic Flow Properties from Shock Velocimetry. B. W. Reed, J. S. Stolken, R.W. Minich, M. Kumar. TMS2011. San Diego, CA, United States. February 27 - March 3, 2011.
  5. Analyzing Strength Effects in Shocks, Backwards and Forwards. B.W. Reed, D.C. Swift, J.S. Stolken, R.W. Minich, M. Kumar. February 23, 2011. APS Shock Compression of Condensed Matter. Chicago, IL, United States. June 26 - July 1, 2011.
  6. Derivation and Solution of Multifrequency Radiation Diffusion Equations for Homogeneous Refractive Lossy Media. A.I. Shestakov, R.M. Vignes, J.S. Stolken. January 11, 2010. Journal of Computational Physics
  7. Microstructural Relaxation Phenomena on Laser-modified Fused Silica Surfaces. M.J. Matthews, T. F. Soules, J. S. Stolken, R. M. Vignes, S. T. Yang, S. Elhadj. American Physical Society Spring Meeting. Dallas, TX, United States. March 21-25, 2011.
  8. An Assessment of Molecular Dynamic Force Fields for Silica for Use in Simulating Laser Damage Mitigation. T. F. Soules, G. H. Gilmer, M. J. Matthews, J. S. Stolken, M. D. Feit. SPIEL Laser Damage. Boulder, CO, United States. September 26 -29, 2010.
  9. Simulation of Infrared Laser Heating of Silica Using Heat Conduction and Multifrequency Radiation Diffusion Equations Adapted for Homogeneous Refractive Lossy Media. A. I. Shestakov, M. J. Matthews, R. M. Vignes, J. S. Stolken. MRS Spring Meeting. San Francisco, CA, United States. April 25-29, 2011
  10. Densification and residual stress induced by CO2 laser-based mitigation of SiO2 surfaces. M. D. Feit , M. J. Matthews, T. F. Soules, J. S. Stolken. SPIE Laser Damage Conference. Boulder, CO, United States. September 26-29, 2010.
  11. Molecular dynamics study of silica glass during laser heating/cooling. T. F. Soules, G. H. Gilmer, M. J. Matthews, J. Stolken. Boulder Damage Symposium. Boulder, CA, United States. September 27-30, 2010.
  12. Densification and residual stress induced by CO2 laser-based damage mitigation of SiO2 surfaces M. D. Feit, M. J. Matthews, T. F. Soules, J. S. Stolken, R. M. Vignes, S. T. Yang, J. D. Cooke Boulder Damage Symposium Boulder, CO, United States September 27, 2010 through September 30, 201
  13. Residual stress and damage-induced critical fracture on CO2 laser treated fused silica. M.J. Matthews, J.S. Stolken, R.M. Vignes, M.A. Norton, S.Yang, J.D. Cooke, G.M. Guss, J.J. Adams Boulder Damage Symposium boulder, CO, United States. September 21, 2009 through September 23, 2009
  14. High temperature thermographic measurements of laser heated silica. J. Elhadj, S. Yang, I. Matthews, R. Vignes, J. Stolken, J. Colvin, J. Bude Boulder Damage Symposium Boulder, CO, United States September 21, 2009 through September 23, 2009
  15. Residual stress and damage-induced critical fracture on CO2 laser treated fused silica. M. J. Matthews, J. S. Stolken, R. M. Vignes, M. A. Norton, S. Yang, J. D. Cooke, G. M. Guss, J. J. Adams Boulder Damage Symposium Boulder, CO, United States September 21, 2009 through September 23, 2009
  16. Surface microstructure evolution of mid- to far-IR laser treated fused silica. M. Matthews, S. Yang, J. Stolken, S. Elhadj, S. Baker, V. Draggoo Materials Research Society Boston, MA, United States December 1, 2008 through December 5, 2008
  17. High temperature thermographic measurements of laser heated silica S. Elhadj, J. Stolken, V. Draggoo, J. Jarboe, J. Adams, M. Matthews Materials Research Society Boston, MA, United States December 1, 2008 through December 5, 2008
  18. Strength Measurements of Shock-Loaded Ta via Heterodyne Velocimetry J. R. Patterson, J. S. Stolken, J. H. Nguyen, B. W. Reed, H. Hsieh, M. Kumar APS March Meeting 2008  New Orleans, LA, United States March 10, 2008 through March 14, 2008
  19. Hugoniot and velocity history data using heterodyne techniques P. Asoka-Kumar, R. Chau, N. C. Holmes, W. P. Ambrose, K. Krauter, O. T. Strand, J. Nguyen, M. Kumar, J. Stolken 15th APS Topical Conference on Shock Compression of Condensed Matter Fairmont Orchid, HI, United States June 24, 2007 through June 29, 2007
  20. In-Situ Diffraction Characterization of Shock-Loaded Single Crystal Iron D. H. Kalantar, J. Hawreliak, H. Lorenzana, A. MacPhee, B. Remington, J. Stolken, A. Higginbotham, G. Kimminau, W. Murphy, B. Nagler, T. Witcher, J. S. Wark, H. Davies, N. Park, L. Thornton 15th APS Topical Conference on Shock Compression of Condensed Matter Fairmont Orchid, HI, United States June 24, 2007 through June 29, 2007
  21. Dynamic Ductility Measurements of Shocked Metals using Time Sequence Radiography R. G. Garza, J. D.Molitoris, H. G. Andreski, J. D. Batteux, L. M. Lauderbach, G. H. Campbell, J. S. Stolken, R. L. Krueger 15th American Physical Society Conference on Shock Compression of Matter Kohala Coast, HI, United States June 23, 2007 through June 29, 2007
  22. Scaling Relationships and Dynamic Failure. M. Kumar, J.S. Stolken, R. W. Minich. TMS Annual Meeting 2007. Orlando, FL, United States. FEB 25 – MAR 1, 2007.
  23. Hugoniot and velocity history data using heterodyne techniques. P. Asoka-Kumar, R. Chau, N. C. Holmes, et al. Hugoniot and velocity history data using heterodyne techniques. 15th APS Topical Conference on Shock Compression of Condensed Matter. HI. June 24, 2007 through June 29, 2007.
  24. In-Situ Diffraction Characterization of Shock-Loaded Single Crystal Iron. D. H. Kalantar, J. Hawreliak, H. Lorenzana, et al. 15th APS Topical Conference on Shock Compression of Condensed Matter. HI. June 24, 2007 through June 29, 2007.
  25. Dynamic Ductility Measurements of Shocked Metals using Time Sequence Radiography. R. G. Garza, J. D.Molitoris, H. G. Andreski, et al. 15th American Physical Society Conference on Shock Compression of Matter. HI. June 23, 2007 through June 29, 2007.
  26. Modeling planetary interiors in laser based experiment using shockless compression J. Hawreliak, J. Colvin, J. Eggert, et al. HEDLA 2006` Houston, TX. March 11, 2006 through March 14, 2006.
  27. Influence of Microstructure and Materials Properties on the Ductility of Shaped Charge Jets. A. J. Schwartz, J. S. Stolken, S. C. Simonson, M. Kumar. International Symposium on Plasticity 2006 Halifax, Canada July 17, 2006 through July 22, 2006.
  28. Measurement of the Orientation Dependence of the Principle Shock Hugoniot in Copper. P. P. Asoka-Kumar, J. Stolken, R. Chau, et al. 14th APS Topical Conference on Shock Compression of Condensed Matter. Baltimore, MD. July 31, 2005 through August 5, 2005.
  29. Direct Observation of the Alpha-Epsilon Transition on Shocked Single Crystal Iron. D. H. Kalantar, G. W. Collins, J. D. Colvin, et al. 14th APS Topical Conference on Shock Compression of Condensed Matter. Baltimore, MD. July 31, 2005 through August 5, 2005.
  30. Picosecond X-Ray Diffraction From Laser-Shocked Copper and Iron. J. S. Wark, J. F. Belak, G. W. Collins, et al. 14th APS Topical Conference on Shock Compression of Condensed Matter. Baltimore, MD. July 31, 2005 through August 5, 2005.
  31. Shock Induced (Alpha)-(Epsilon) Phase Change in Iron: Analysis of MD Simulations and Experiment. J. Hawreliak, K. Rosolankova, J. F. Belak, et al. 14th APS Conference on Shock Compression of Condensed Matter. Baltimore, MD. July 30, 2005 through August 7, 2005.
  32. Shaped-Charge Jet Stability Calculations: The Role of Initial and Boundary Conditions. J. S. Stolken, M. Kumar, S. C. Simonson February 8, 2005. 22nd International Symposium on Ballistics Vancouver, Canada. November 14, 2005 through November 18, 2005.
  33. In-situ diffraction measurements of lattice response due to shock loading, including direct observation of the alfa-epsilon phase transition in Fe. D. H. Kalantar, G. Collins, J. Colvin, et al. Lake Tahoe, CA. Hypervelocity Impact Symposium. October 10-14, 2005.
  34. Direct Observation of the Alpha-epsilon Phase Transformation in Shocked Single Crystal Iron. D. H. Kalantar, J. D. Colvin, J. Eggert, et al. 14th American Physical Society Topical Meeting on Shock Compressed Condensed Matter. Baltimore, MD. July 31, 2005 through August 5, 2005.
  35. Influence of Microstructural Length Scales on Dynamic Failure. Mukul Kumar, Roger Minich, James Stolken. Presented at: Materials Research Society Spring Meeting. San Francisco, CA, United States March 28, through April 1, 2005 UCRL-ABS-207584
  36. X-ray Diffraction Investigation of Strain Gradient Plasticity Theories. Barney, M M. et al. Presented at: MRS Fall Meeting, November 29, 2004. Boston MA. UCRL-ABS-204674
  37. In-situ Diffraction Studies of Shock Compressed Single-Crystal Iron. Kalantar, D H. et al. Presented at: In-situ Diffraction Studies of Shock Compressed Single-Crystal Iron, Savannah , GA, United States, Nov 15 - Nov 19, 2004. UCRL-CONF-205410
  38. Effect of the grain boundary on the evolution of deformation in a bicrystal. Ziegler, A. et al. Presented at: IIB2004, Belfast, United Kingdom, Jul 26 - Jul 29, 2004. UCRL-PROC-206443
  39. Kumar, M et al. Microstructural Engineering of Shape Charged Liners. 21st International Symposium on Ballistics, Adelaide, Australia, Apr 19 – Apr 23, 2004.
  40. Blobaum, K et al. Microstructural Engineering of Copper Shaped-Charge Liners. The Metallurgical Society 2004 Annual Meeting, Charlotte, NC, Mar 14 - Mar 18, 2004.
  41. Remington, B A et al. Materials Science under Extreme Conditions of Pressure and Strain Rate. 132nd Annual Meeting of TMS, San Diego, CA, Mar 02 - Mar 06, 2003.
  42. Remington B.A. et. al. Materials Science at Extreme Pressures and Strain Rates. Annual Meeting of the Division of Plasma Physics, Orlando, FL, Nov 11-15, 2002.
  43. Caturla M.J., Kubota A., Stolken J.S., Mcnaney J.M., Remington B.A., Diaz de la Rubia T. Atomistic modeling of spherical shocks. Shock Waves in Condensed Matter, St. Petersburg, Russia, Sep 1-6, 2002.
  44. Ryaby J.T., Balooch M., Stolken J.S., Kinney J.H. A lateral force AFM study of collagen orientation in lamellar bone. JOURNAL OF BONE AND MINERAL RESEARCH. 17 (5): OC1 (2002).
  45. Stolken J.S., Campbell G.H. Grain boundary constraint effects on the constitutive response of tantalum bicrystals: experiments and finite element analysis. International Symposium on Plasticity, Palm Beach, Aruba, Jan 3-8, 2002.
  46. Minich R., Stolken J.S., Kumar M., Schuh C. Stochastic Method for the Evolution of Microstructures with Particular Reference to Grain Boundary Networks. Materials Research Society Fall Meeting. Boston, MA, Dec, 2001.
  47. Kumar M., Minich R., Stolken J.S., King W. Alteration of the Connectivity of the Grain Boundary Network by Sequential Thermomechanical Processing. Grain Growth and Recrystallization. Aachen, Aug 2001.
  48. Kubota A., Davila L., Caturla M.J., Stolken J.S., Sadigh B., Quong A., Rubenchik A., Feit M.D. Structural Modifications in Fused Silica Due to Laser Damage Induced Shock Compression. Boulder Annual Symposium on Optical Materials for High Power Lasers, Boulder, CO, Oct 1-3, 2001.
  49. Stolken J.S.,  Diaz de la Rubia T. Multiscale Modeling of Irradiation Damaged Materials. Conference on Multiscale Simulation, Theoretical, and Experimental Approaches to Deformation, Friction, Fatigue, and Fracture Baton Rouge, LA. Feb, 2001.
  50. Stolken, J.S., Becker R.C. Finite element simulation of a 1000 grain "virtual test sample". Materials Research Society Fall Meeting, Boston, MA, Nov 27-Dec 1, 2000.
  51. Bassani J.L., Hu Y., Ito K., Stolken J.S., Vitek V. Yield criteria for Bcc metals from atomistic simulations of dislocation core structures Materials Research Society Fall Meeting, Boston, MA, Nov 27-Dec 1, 2000.
  52. Barney M.M., Campbell G.H., Stolken J.S., Schwartz A.J., Plitzko J.M., King W.E., Morris J.W., Jr. Experimental assessment of strain gradient plasticity. Materials Research Society Fall 2000 Meeting, Boston, MA, Nov 27-Dec 1, 2000.
  53. Stolken J.S., Rhee M., Bulatov V., Diaz de la Rubia T., Zbib H., Hirth J. Dislocation dynamics using anisotropic elasticity: methodology and analysis. Dislocations 2000 Meeting, Gaithersburg, MD, Jun 19-22, 2000.
  54. Rhee M., Wirth B., Stolken J.S. Three-dimensional dislocation dynamics simulations of stacking fault tetrahedra formation using anisotropic elasticity. The Metallurgical Society Annual Meeting, Nashville, TN, March 12-16, 2000.
  55. Stolken J.S., King W.E., Campbell G.H., Schwartz A.J., Balooch M. Analysis of anomalous slip in ta single crystals using optical, atomic force, orientation imaging, and transmission electron microscopies. Materials Research Society Fall Meeting, Boston, MA, Nov 29-Dec 3, 1999.
  56. King, W., Stolken J.S., Schwartz A.J., Wall M.A., Nguyen L. Reconstruction of a 3d microstructure using orientation imaging microscopy. Materials Research Society Fall Meeting, Boston, MA, Nov 29-Dec 3, 1999.
  57. Wickham L.K., Schwarz K.W., Stolken J.S. Dislocation forest interactions: simulation and prediction. Materials Research Society Fall Meeting, Boston, MA, Nov 29-Dec 3, 1999.
  58. Shu J., Stolken J.S. Strain gradient effects in bending. Materials Research Society Fall Meeting, Boston, MA, Nov 29-Dec 3, 1999.
  59. Stolken, J.S. Systematic analysis of dislocation junction reactions in bcc metals using anisotropic elasticity. Materials Research Society Fall Meeting, Boston, MA, Nov 29-Dec 3, 1999.
  60. Stolken J.S., King W.E., Schwartz A.J., Campbell G.H., Balooch M. Analysis of anomalous slip in Ta single crystals using optical, atomic force, and orientation imaging microscopies. The Metallurgical Society Fall Meeting, Cincinnati, OH, Oct 31-Nov 4, 1999.
  61. Schwartz A.J., King W.E., Campbell G.H., Stolken J., Shu J.Y., Lassila D.H., Sam D.D., Adams B.L., Sun S. Lattice reorientations during compression deformation of a [110] Ta single crystal. The Metallurgical Society Annual Meeting, San Diego, CA, Feb 28-Mar 4, 1999.
  62. Schwartz A.J., Stolken J.S., King W.E., Campbell G.H., Lassila D.H., Sun S., Adams B.L. Analysis of compression behavior of a [011] Ta single crystal with orientation imaging microscopy and crystal plasticity. Materials Research Society Fall Meeting, Boston, MA, Nov 30-Dec 4, 1998.
  63. Schwartz A.J., King W.E., Campbell G.H., Stolken J., Shu J.Y., Lassila D.H., Sam D.D., Adams B.L., Sun S. Orientation imaging microscopy investigation of the compression deformation of a [110] Ta single crystal. Materials Research Society Fall Meeting, Boston, MA, Nov 30-Dec 4, 1998.

DISSERTATION

The Influence of Dissolved Oxygen upon the Fracture Toughness of Nickel-Sapphire Interfaces. University of California at Santa Barbara. Dec 7, 1997. ABSTRACT: Using a combination of controlled-oxygen diffusion bonding, thin-film deposition and fracture testing, the influence of dissolved oxygen upon the toughness of nickel-sapphire interfaces is explored.  Fracture toughness tests were performed on nickel-sapphire sandwich specimens diffusion bonded in atmospheres of varying oxygen partial pressure. Substrates with and without a pre-grown spinel layer were joined with nickel to explore the effects of spinel quality and its interaction with the bonding environment.  Constitutive testing of oxygen saturated nickel and spinel residual stress measurements were performed to interpret the fracture toughness experiments. The fracture surfaces of the metal and ceramic were characterized using XRD, SEM, EDS, and optical microscopy.

  • Achievement Reward for College Scientists (ARCS Foundation)
  • U.S. Navy Citation (Rear Admiral W.E. Rickman, Submarine Group NINE)
  • U.S. Navy Citation (Captain R.N. Lee, USS Dixon)
  • Materials Department Citation (U.C. Berkeley)
  • J. Waldel Scholarship (American Ceramics Society)
  • W.M. Fitzhugh Scholarship (U.C. Berkeley)
  • G. Douglass Scholarship (U.C. Berkeley)