Fracture energy of gels

To clarify effects of crack speed and cross-link density on fracture energy of acrylamide gels, we evaluated the roughness of the fracture surface and measured the fracture energy taking into account the roughness. The fracture energy increases linearly with crack speed $V$ in a fast crack speed region, and the increasing rate of fracture energy with $V$ decreases with increasing cross link density in the gels. In a slow crack speed region the fracture energy depends on crack speed more strongly than in the fast crack speed region. This indicates that a qualitative change exists in fracture process of the gels.Comment: 7 pages, 8 figures. Some errors in the first version have been correcte

Posterior stabilized型人工膝関節置換術における関節面の内方傾斜により接触力および接触応力は上昇する

京都大学0048新制・課程博士博士(医学)甲第21674号医博第4480号新制||医||1036(附属図書館)京都大学大学院医学研究科医学専攻(主査)教授 安達 泰治, 教授 黒田 知宏, 教授 戸口田 淳也学位規則第4条第1項該当Doctor of Medical ScienceKyoto UniversityDFA

Detection of damage evolution in SiC/SiC under tensile loading using Talbot-Lau X-ray interferometer

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Existence of spiky stationary solutions to a mass-conserved reaction-diffusion model

We deal with a mass-conserved three-component reaction-diffusion system which is proposed by a model describing the dynamics of wavelike actin polymerization in the macropinocytosis and numerically exhibits dynamical patterns such as annihilation, crossover, and nucleation of pulses (Yochelis-Beta-Giv 2020). In this article we first establish the condition for the diffusion driven instability in the system. Then we rigorously prove the existence of spiky stationary solutions to the system in a bounded interval with the Neumann condition. By numerics these solutions play a crucial role in the nucleation of pulses. Reducing the stationary problem to a scalar second order nonlinear equation with a nonlocal term, we construct the desired solution by converting the equation to an integral equation

Detection of micro cracking and SiC fiber distribution and its relationship between dark-field images using Talbot-Lau interferometer

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Time and the Political in Japanese Society

The aim of this paper is, first, to elucidate the configuration of some problems concerning \u27Time and the Political\u27 in the history of Japanese society. I think that the most important characteristic of Japanese society at present is the accumulated structure of three strata, namely, \u27Pre-Modern action/ relation process\u27, \u27Modern action/relation process\u27 and \u27Post-Modern action/relation process\u27 -these three strata are piled up simultaneously-. I will argue how this chracteristic has been affected by the present rapid social changes- \u27high information society\u27, \u27mass consumption society\u27, \u27over-managerial society\u27-in Japanese society today. Second, I would like to consider the fact that the Time of Japanese people\u27s life world was regarded as necessary resource for \u27enriching the nation, strengthening the armed forces\u27 policy in the modernizing process of Japan since 1867. Here, it is need to take notice the strong control and arrangement of Time Budget by the Meiji nation was able to be successful only with the foundation of foregoing Tokugawa feudal regime. It distorted the social relevance between \u27Private\u27 and \u27Public\u27 into the pattern of \u27selfless de votion to his nation-absolute Public-\u27. It also impeded the formation of individualism among Japanese people on the basis of \u27Private\u27 action/relation process. Finally, I will examine significant aspects of Time under the industrialization, urbanization and privatization after the defeat of Japanese fascism (1945); after that, I will show the prospect for the liberation of the \u27ensemble of relations\u27 -it seems to be the most keen theme about \u27the Politics of Freedom\u27 in Japanese society today

Upper Lumbar Pedicle Screw Insertion Using Three-Dimensional Fluoroscopy Navigation:Assessment of Clinical Accuracy

We used a navigation system to insert 128 pedicle screws into 69 vertebrae (L1 to L3) of 49 consecutive patients. We assessed the pedicle isthmic width and the permission angle for pedicle screw insertion. The permission angle is the angle defined by the greatest medial and lateral trajectories allowable when placing the screw through the center of the pedicle. The rate of narrow-width pedicles (isthmic width less than 5mm) was 5 of 60 pedicles (8%) at L1, 4 of 60 pedicles (7%) at L2, and none (0%) at L3, L4 and L5. The rate of narrow-angle pedicles (a permission angle less than 15 degrees) was 21 of 60 pedicles (35%) at L1, 7 of 60 (12%) at L2, 3 of 60 (5%) at L3, and none (0%) at L4 and L5. Of 128 pedicle screws inserted into 69 vertebrae from L1 to L3, 125 (97.7%) were classified as Grade 1 (no pedicle perforation). In general, the upper lumbar vertebrae have more narrow-width and -angle pedicles. However, we could reduce the rate of pedicle screw misplacement in upper lumbar vertebra using a three-dimensional fluoroscopy and navigation system

Posterior cervical spine arthrodesis with laminar screws: a report of two cases

We performed fixation using laminar screws in 2 patients in whom lateral mass screws, pedicle screws or transarticular screws could not be inserted. One was a 56-year-old woman who had anterior atlantoaxial subluxation (AAS). When a guide wire was inserted using an imaging guide, the hole bled massively. We thought the re-insertion of a guide wire or screw would thus increase the risk of vascular injury, so we used laminar screws. The other case was an 18-year-old man who had a hangman fracture. Preoperative magnetic resonance angiography showed occlusion of the left vertebral artery. A laminar screw was inserted into the patent side (i.e., the right side of C2). Cervical pedicle screws are the most biomechanically stable screws. However, their use carries a high risk of neurovascular complications during screw insertion, because the cervical pedicle is small and is adjacent laterally to the vertebral artery, medially to the spinal cord, and vertically to the nerve roots. Lateral mass screws are also reported to involve a risk of neurovascular injuries. The laminar screw method was thus thought to be useful, since arterial injuries could thus be avoided and it could also be used as a salvage modality for the previous misinsertion.</p