Dependence of exciton transition energy of single-walled carbon nanotubes on surrounding dielectric materials

We theoretically investigate the dependence of exciton transition energies on dielectric constant of surrounding materials. We make a simple model for the relation between dielectric constant of environment and a static dielectric constant describing the effects of electrons in core states, $\sigma$ bonds and surrounding materials. Although the model is very simple, calculated results well reproduce experimental transition energy dependence on dielectric constant of various surrounding materials.Comment: 5pages, 4 figure

Initial attachment of osteoblasts to various guided bone regeneration membranes: an in vitro study

Guided bone regeneration (GBR) has proved to be a suitable and somehow predictable technique for promoting bone regeneration. Avariety of synthetic and naturally derived GBR barriers have been used in clinics to facilitate bone regeneration. These barriers may differ in composition and structure and these may affect the outcomes of GBR. Therefore, the present study was undertaken to evaluate the in vitro ability of osteoblasts (MC3T3-E1) to attach to various GBR membranes. Materials and methods:  Six GBR/GTR (guided tissue regeneration) membranes [BioMend ® (BM), Resolut ® (RL), Guidor ® (GD), EpiGuide ® (EG), Gore-Tex ® (GT) and Millipore filter ® (MP)] were tested. For controls, cells were directly plated on culture dishes (CD). Each test membrane was secured to the bottom of a culture dish with a double-sided adhesive tape. All samples were triplicate. At 1.5 and 24 h after plating of 2 ml (5 × 10 4 cells/ml) of MC3T3-E1 (passage 7) cells, the specimens were rinsed with phosphate-buffered saline to wash out any unattached cells and then fixed with a 10% buffered formalin solution for 1 d. After washing with distilled water, the cells were stained with hematoxylin. The number of attached cells was counted under a light microscope equipped with an ocular-micrometer in a unit area of 0.25 mm 2 (five areas on each membrane). In addition, cell morphology attached to the membranes was evaluated under scanning electron microscope. Results:  Data were presented as mean ± standard error and analyzed for statistical difference using a generalized Wilcoxon's test. Cell attachment at 1.5 h was as follows: MP (27.5 ± 2.1) > RL (17.0 ± 1.4) ≈ BM (14.5 ± 1.4) ≈ EG (11.4 ± 1.0) > GD (5.2 ± 0.8) ≈ GT (3.1 ± 0.6); and at 24 h was: MP (67.6 ± 3.6) > RL (35.8 ± 1.8) > BM (15.4 ± 0.9) ≈ EG (13.3 ± 1.3) > GD (5.9 ± 0.7) ≈ GT (5.6 ± 1.3). At 24 h, the scanning electron microscope finding revealed that cells attached on MP, RL, BM and EG were flatter in shape, like cells on CD, than cells on GD and GT, where cells were rather round. Conclusions:  Results from this study suggested that MP, BM, RL and EG enhanced the early osteoblast attachment. However, the true benefit of this observation in clinic remains to be determined.Peer Reviewedhttp://deepblue.lib.umich.edu/bitstream/2027.42/65252/1/j.1600-0765.2002.01625.x.pd

<Advanced Energy Conversion Division> Nano Optical Science Research Section

3-1. Research Activities in 202

An fMRI-constrained MEG source analysis with procedures for dividing and grouping activation

1

Light hadron spectroscopy in two-flavor QCD with small sea quark masses

We extend the study of the light hadron spectrum and the quark mass in two-flavor QCD to smaller sea quark mass, corresponding to $m_{PS}/m_{V}=0.60$--0.35. Numerical simulations are carried out using the RG-improved gauge action and the meanfield-improved clover quark action at $\beta=1.8$ ($a = 0.2$ fm from $\rho$ meson mass). We observe that the light hadron spectrum for small sea quark mass does not follow the expectation from chiral extrapolations with quadratic functions made from the region of $m_{PS}/m_{V}=0.80$--0.55. Whereas fits with either polynomial or continuum chiral perturbation theory (ChPT) fails, the Wilson ChPT (WChPT) that includes $a^2$ effects associated with explicit chiral symmetry breaking successfully fits the whole data: In particular, WChPT correctly predicts the light quark mass spectrum from simulations for medium heavy quark mass, such as m_{PS}/m_V \simgt 0.5. Reanalyzing the previous data %at $m_{PS}/m_{V}=0.80$--0.55 with the use of WChPT, we find the mean up and down quark mass being smaller than the previous result from quadratic chiral extrapolation by approximately 10%, $m_{ud}^{\bar{\rm MS}}(\mu=2 {GeV}) = 3.11(17)$ [MeV] in the continuum limit.Comment: 33 page

Fluid permeation through a membrane with infinitesimal permeability under Reynolds lubrication

This article has been published in a revised form in Journal of Mechanics [https://doi.org/10.1017/jmech.2020.38]. This version is published under a Creative Commons CC-BY-NC-ND. No commercial re-distribution or re-use allowed. Derivative works cannot be distributed. © 2020 The Society of Theoretical and Applied Mechanics