7 research outputs found
奄美群島超高齢者の「老年的超越（Gerotranscendence）」形成に関する検討 : 高齢期のライフサイクル第８段階と第９段階の比較
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Biaxial Bending Moment-Curvature Relation of Box Beam-Column with Degrading Stress-Strain Relation
No full textapplication/pdfThe biaxial bending behavior of a rectangular box steel beam-column involving local buckling is investigated by the analysis. The analysis is carried out numerically by assuming the degrading type of stress-strain relation that represents the effect of local buckling. The biaxial moment-curvature relation is obtained for a beam-column which is subjected to the cyclic or monotonic loading in such a way that the curvatures about principal axes change in a fixed proportion. The paper discusses the inelastic biaxial bending behavior of beam-column with the degrading stress-strain relation, and proposes a concept for estimating the aseismic safety and earthquake-resistant capacity is proposed for the column involving local buckling.departmental bulletin pape
Computational design of a high-efficiency accelerator grid for a miniature ion thruster by full-aperture ion optics simulations
Get PDFFull-aperture ion optics simulations have been conducted for the inhomogeneous plasma source of a miniature ion propulsion system (MIPS) to design a high-efficiency accelerator grid that provides high degree of the neutral confinement and absence of direct ion impingement. The designed accelerator grid has flat upstream and smoothly curved downstream surfaces with straight holes for easy low-cost manufacture. The diameter of the accelerator aperture was changed from the nominal value of 0.40 mm to 0.25 mm, which decreased neutral leakage and increased the propellant utilization efficiency from 31 to 50%. The direct impingement of ions caused by decreasing the accelerator aperture diameter was compensated by reducing the thickness of the accelerator grid while taking into account the inhomogeneous ion beam current density profile of the MIPS. An off-design performance simulation was conducted to validate the proposed grid design; the obtained results showed that the ion beam could be accelerated smoothly even during throttling the beam current between 75 and 150%. A grid wear simulation was also performed to compare the changes in the propellant utilization efficiency between the nominal and high-efficiency grids caused by erosion. It was found that the propellant utilization efficiency of the high-efficiency grid was greater than that of the nominal grid within the first 5,000 h of operation and that its lifetime exceeded 10,000 h of the accumulated operation time. By using the proposed high-efficiency accelerator grid and MIPS plasma source, the propellant utilization efficiency was increased, while the accelerator impingement current became negligible
Kaplan-Meier plots for the two image analysis factors significantly (p 0
No full text<p><b>Copyright information:</b></p><p>Taken from "Ductal carcinoma of the breast (DCIS) with heterogeneity of nuclear grade: prognostic effects of quantitative nuclear assessment"</p><p>http://www.biomedcentral.com/1471-2407/7/174</p><p>BMC Cancer 2007;7():174-174.</p><p>Published online 10 Sep 2007</p><p>PMCID:PMC2001197.</p><p></p>001) associated with development of invasive disease in the multivariate assessments: A. Texture (difference entropy) (p < 0.001). B. Texture (contrast) (p < 0.001)
