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We investigate the morphology of a pentacene (C22H14) film adsorbed on the Cu(1 1 9) vicinal surface by scanning tunnelling microscopy (STM). Thermal treatment of a thick film of molecules generates a long-range ordered structure. Series of molecular rows are alternated with areas where the molecules assume two equivalent orientations. STM data analysis suggests that the ordered structure can be described by a rippled morphology. The behaviour of the film at different annealing temperatures suggests a possible explanation of the film structure as due to an adsorbate-induced modification of the substrate. 相似文献
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The elastic strains induced in the constituent wires of parallel wire strands under tensile loading were measured using neutron
diffraction. The elastic strains carried by the individual wires depended very strongly on the boundary conditions at the
grips and on radial clamping forces. The friction forces between the wires were quite significant and should not be neglected
in analytical or numerical formulations of strain partitioning in parallel wire cables. 相似文献
85.
Li CK Séguin FH Rygg JR Frenje JA Manuel M Petrasso RD Betti R Delettrez J Knauer JP Marshall F Meyerhofer DD Shvarts D Smalyuk VA Stoeckl C Landen OL Town RP Back CA Kilkenny JD 《Physical review letters》2008,100(22):225001
Time-gated, monoenergetic radiography with 15-MeV protons provides unique measurements of implosion dynamics in direct-drive inertial-confinement fusion. Images obtained during acceleration, coasting, deceleration, and stagnation display a comprehensive picture of spherical implosions. Critical information inferred from such images, hitherto unavailable, characterizes the spatial structure and temporal evolution of self-generated fields and plasma areal density. Results include the first observation of a radial electric field inside the imploding capsule. It is initially directed inward (at approximately 10(9) V/m), eventually reverses direction ( approximately 10(8) V/m), and is the probable consequence of the evolution of the electron pressure gradient. 相似文献
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Shock ignition of thermonuclear fuel with high areal density 总被引:1,自引:0,他引:1
Betti R Zhou CD Anderson KS Perkins LJ Theobald W Solodov AA 《Physical review letters》2007,98(15):155001
A novel method by C. Zhou and R. Betti [Bull. Am. Phys. Soc. 50, 140 (2005)] to assemble and ignite thermonuclear fuel is presented. Massive cryogenic shells are first imploded by direct laser light with a low implosion velocity and on a low adiabat leading to fuel assemblies with large areal densities. The assembled fuel is ignited from a central hot spot heated by the collision of a spherically convergent ignitor shock and the return shock. The resulting fuel assembly features a hot-spot pressure greater than the surrounding dense fuel pressure. Such a nonisobaric assembly requires a lower energy threshold for ignition than the conventional isobaric one. The ignitor shock can be launched by a spike in the laser power or by particle beams. The thermonuclear gain can be significantly larger than in conventional isobaric ignition for equal driver energy. 相似文献
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