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21.
Sumitomo N Noritake K Hattori T Morikawa K Niwa S Sato K Niinomi M 《Journal of materials science. Materials in medicine》2008,19(4):1581-1586
In order to investigate bone tissue reaction to the low rigidity titanium alloy of TNTZ in bone plate fixation, animal experiment
with rabbit was performed with X-ray follow-up and histological observation. Experimental fractures were made in rabbit tibiae,
and fixed by different bone plates of SUS316L, Ti–6Al–4V and TNTZ. Although there was no significant difference in fracture
healing, bone atrophy was observed in cortical bone especially under the bone plate, which was different in time course among
three materials. The bone atrophy under the bone plate was confirmed as porous or poor bone tissue in histological observation.
In addition, the diameter of the tibia bone was increased in TNTZ as the result of bone remodeling with a new cortical bone.
It is confirmed that the elastic modulus of the bone plate will naturally influence bone tissue reaction to the bone plate
fixation according to the Wolff’s law of functional restoration. 相似文献
22.
Jin-Young Kim Masahiro Inoue Zenji Kato Nozomu Uchida Katsuichi Saito Keizo Uematsu 《Journal of Materials Science》1991,26(8):2215-2218
Spray-dried yttria-doped zirconia granules were made transparent by immersion in a liquid and the internal structure was characterized using an optical microscope. This unique technique was found to be applicable for this system by using an immersion liquid with appropriate refractive index, and it enabled observation of the internal structure to be made over the entire volume of granules, in clear contrast to conventional SEM observation. Distinct features, which were considered to be agglomerates, were found in the granules. This was supported by SEM observation. 相似文献
23.
Yamanaka N Aoyama T Ikeda N Higashihara M Kamata K 《Hemodialysis international. International Symposium on Home Hemodialysis》2005,9(3):303-308
Entropy (ENT) is a newly developed measure of the complexity of heart rate variability (HRV). The aim of this study was to characterize the complexity of HRV in patients with end-stage renal disease (ESRD) and to find a possible clinical utility. Healthy subjects and patients with ESRD undergoing hemodialysis (HD) were recruited. The HD population consisted of patients with and without diabetes mellitus (DM). An electrocardiogram was recorded before HD, and blood pressure was measured during HD. The coefficients of variation of R-R intervals, high- and low-frequency components, and ratio of the low- to high-frequency components were measured as variables of HRV. The ENT was used to describe the complexity of HRV. Forty-six healthy subjects and 27 HD patients participated in this study. The ENT negatively correlated with the duration of DM (p = 0.001), systolic blood pressure (p = 0.003), and mean blood pressure (p = 0.004) before a HD session. ENT in HD patients was lower than that in healthy subjects (p < 0.01). ENT in HD patients with DM was lower than that in HD patients without DM (p < 0.01). The change in systolic blood pressure (DeltaSBP) during a HD session showed high correlations to ENT and ultrafiltration rate (UFR) of the dialyzer. The following equation was obtained: DeltaSBP = 2.25 x ENT - 2.28 x UFR - 21.27 (R2 = 0.805; p < 0.0001). ENT decreased with uremic and diabetic status. ENT also represents a possible prediction of hypotension during a HD session. 相似文献
24.
25.
Kazuhiko Masuda Yuzo ManoHiroshi Ishimoto Masami TokunoYoshito Yoshizaki Nozomu OkawaraRyutaro Yamagiwa Akihiro UchiyamaAkihiro Yamazaki Yukitomo Tsutsumi 《Remote sensing of environment》2003,85(4):484-488
Optical thickness of the Asian dust aerosols over the ocean near Japan was retrieved from the visible data of the Geostationary Meteorological Satellite (GMS-5) from April 7 to 22, 2002 using the method by Masuda et al. [Remote Sens. Environ. 82 (2002) 238] in which the nonsphericity of dust particles was taken into account. The retrieved optical thicknesses were then compared with those derived from the sunphotometer and the skyradiometer measurements. The mean and the standard deviation of the optical thickness difference, GMS minus radiometers, were −0.03 and 0.17, respectively, for 85 samples where the optical thickness ranges from 0.25 to 1.07. 相似文献
26.
Sato Yuki Izui Kazuhiro Yamada Takayuki Nishiwaki Shinji Ito Makoto Kogiso Nozomu 《Structural and Multidisciplinary Optimization》2019,59(1):75-91
Structural and Multidisciplinary Optimization - This paper presents a reliability-based topology optimization method under geometrical uncertainties. First, we briefly introduce the concept of... 相似文献
27.
Noriyuki Utagawa Ippei Kondo Naoto Yoshida Mamoru Itho Nozomu Yoshida 《Computer-Aided Civil and Infrastructure Engineering》1992,7(2):151-159
Abstract: A system for simulating the behavior of a reinforced concrete building being demolished by controlled explosion is developed. The purpose for developing the system is to examine the effects of blast location, blast size, blast sequence, delay time of blasts and other factors on a planning of blast demolition. It consists of a numerical analysis part to simulate the blast demolition of a space-framed structure and a visualizing system to show the dynamic behavior obtained from the numerical analysis. The numerical analysis is based on the distinct element method, which is improved for consideration of the bending behavior of beams and columns. The elastoplastic behavior of the structural members up to the collapse are modeled in the analysis. The numerical data display system 'AVS' is employed, in addition to the computer code developed by the authors, to make the visualization system for three-dimensional dynamic problems. In this report the method of numerical analysis, the visualizing system, and a comparison between the experiment and analysis are presented. 相似文献
28.
Carbon nanowires are formed on a surface of nanoparticles made of diamond-like carbon produced on a nickel plate placed in CH4–Ar plasma. The dissociation of CH4 is controlled by changing the mixing position of CH4 along the Ar plasma produced in a small coaxial tube electrode. When CH4 is introduced in low electron temperature Te region, we observed an appearance of nanowires on the surface of microparticles. On the other hand, carbon nanowalls and/or nanoplatelets are formed when the CH4 is mixed in the high Te region. 相似文献
29.
Adsorption Effects on the Rheological Properties of Aqueous Alumina Suspensions with Polyelectrolyte 总被引:15,自引:0,他引:15
Lu-Cun Guo Yao Zhang Nozomu Uchida Keizo Uematsu 《Journal of the American Ceramic Society》1998,81(3):549-556
The influence of adsorption coverage and free polymer on the rheological properties of aqueous alumina suspensions with polyelectrolyte was studied. The flow curves of the suspensions followed the Casson model very well in the observed range of shear rate. The Casson yield value, τc , was used to evaluate the stability. The coverage exerted a profound influence on the rheological properties by affecting the interaction between particles. The zeta potential increased and the value of τc decreased as the coverage increased. The free polymer could cause weak flocculation as its concentration was increased to a certain level. The opposite effects of the adsorbed polymer and free polymer on stability resulted in the presence of optimum coverage for stabilization. The concentration of free polymer increased rapidly as the adsorption coverage approached the saturation limit, and then the free polymer started to dominate the stability. Stabilization could be achieved at a condition of unsaturated adsorption and was related to the non-high-affinity adsorption at alkaline pH (9.2). The impact of adsorption affinity on stability was discussed. 相似文献
30.
Sutasinee Kityakarn Takahiro Saida Aya Sode Nozomu Ishiguro Oki Sekizawa Tomoya Uruga Kensaku Nagasawa Takashi Yamamoto Toshihiko Yokoyama Mizuki Tada 《Topics in Catalysis》2014,57(10-13):903-910
The transitional states of a Pt/C cathode electrocatalyst in the membrane electrode assembly of a polymer electrolyte fuel cell during loading with transient voltages were systematically analyzed by in situ time-resolved X-ray absorption fine structure with time resolution of 100 ms. The results suggest that the local coordination of the Pt cathode electrocatalyst was unaffected by the transient voltages during both rapid and gradual loading over 0–30 s. 相似文献