Hidden Spoor, Ruan Xiaoxu, And His Treatise On Reclusion

In early medieval China great attention was paid to compiling accounts of men in reclusion, yet the prefaces to these compilations often contain only vague or stale reasoning concerning the nature of reclusion itself. A preface by Shen Yue (441-513) is a notable exception: Shen differentiated between disengagement and reclusion. A slightly later contemporary of Shen, Ruan Xiaoxu (479-536), took issue with him in a unique and tightly constructed disquisition on what Ruan saw as a basic dichotomy in the Way of man: the root and overt traces. Ruan\u27s overlooked treatise is examined here, as are some relevant facets of his life

Calculation of light nucleus reaction cross sections in Geant4

Total reaction cross sections of light projectile nucleus (H-2, H-3, He-3 and He-4) interactions with nuclei are calculated using Geant4 models, and compared with experimental data. It is shown that the models give various predictions at low energies, in the region of the Coulomb barrier. "Shen model" (W.-Q. Shen et al., Nucl. Phys. {\bf A491} (1989) 130) is identified as an improvement over other models.Comment: 2 pages text, 8 figure

OPAL and More

We shall summarize some of the research activities performed in collaboration with Ben Shen in the OPAL experiment at LEP and in the CMS experiment at the LHC. And we shall recall the LEP legacy to particle physics in general and to the Standard Model in particular. Short recollections are made in other fields in which Ben was interested, in particular in Astroparticle Physics.Comment: Talk given at the Benjamin C. Shen Memorial Symposium, UCR, March 8, 2008. Changed reference

Symmetry of the Gap in Bi2212 from Photoemission Spectroscopy

In a recent Letter, Shen et al have detected a large anisotropy of the superconducting gap in Bi2212, consistent with d-wave symmetry, from photoemission spectroscopy. Moreover, they claim that the change in their spectra as a function of aging is also consistent with such an intrepretation. In this Comment, I show that the latter statement is not entirely correct, in that the data as a function of aging are inconsistent with a d-wave gap but are consistent with an anisotropic s-wave gap.Comment: 3 pages (Plain TeX with macros), plus 1 postscript figur

I-method for Defocusing, Energy-Subcritical Non-linear Wave Equation

In this paper the author considers the global existence and well-posedness of the non-linear wave equation $\partial_t^2 u - \Delta u = -|u|^{p-1} u$ in 3-dimensional space, assuming that the initial data is in the space $(\dot{H}^s \cap \dot{H}^{s_p}) \times (\dot{H}^{s-1} \cap \dot{H}^{s_p-1})$, with $11/3<p<5$, $s_p = 3/2 - 2/(p-1)$ and $s$ sufficiently close to 1. The main idea is to use the I-method and consider the almost conservation law of the energy.Comment: 15 pages, 1 figur