103 research outputs found

    A Study on Failure Mechanism of Embankment Dams for Irrigation Damaged by the 1995 Hyogoken-Nanbu Earthquake

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    The objects of this investigation are to examine the following mechanism of embankment dams for irrigation damaged by the 1995 Hyogoken-Nanbu Earthquake; 1) the mechanism and process of collapse for the Idenoshiri-Ike embankment dam using the effective stress earthquake response analysis; 2) the mechanism of upper slope failure for the Sugatadani-Ike embankment dam using the total stress earthquake response analysis as well as the slope stability analysis with seismic intensity. As a result, the following conclusions are obtained for each objects; 1) the mechanism and process of collapse due to liquefaction can be analyzed that the liquefied areas initially occurred at the toes of upper and lower slopes are extended and connected to make flow downward the volume of embankment and that the result of this analysis is consistent with the real damaged situation; 2) the mechanism of upstream slope failure can be explained only with considering the increase of excess pore pressure in the upstream slope, not extending complete liquefaction, using the both analyses

    Acoustic stiffness and change in plug cartilage over time after autologous osteochondral grafting: correlation between ultrasound signal intensity and histological score in a rabbit model

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    We investigated quantitative changes over time in ultrasound signal intensity (an index of stiffness), signal duration (an index of surface irregularity), and interval between signals (an index of thickness) of plug cartilage in an animal model of autologous osteochondral grafting. A full-thickness osteochondral plug was surgically removed and replaced in male Japanese white rabbits (n = 22). Specimens obtained at day 0 and weeks 2, 4, 8, 12 and 24 postoperatively were assessed using an ultrasound system and by macroscopic and histological evaluation (modified Mankin's score). Histology revealed that the plug sank until 2 weeks postoperatively, and that newly formed cartilage-like tissue covered the plug, but at 24 weeks the tissue detached. The plug itself survived well throughout the period of observation. Although the signal intensity at the plug site was same as that in the sham operated contralateral knee at day 0, from 2 to 24 weeks postoperatively it was less than that in the sham knee. At 8 weeks, this difference was significant (P < 0.05). Modified Mankin's score revealed early degenerative changes at the site, but macroscopic examination did not. Signal intensity correlated significantly with score (both at day 0 and at the five postoperative time points [P < 0.05, r = -0.91] and as a whole [P < 0.05, r = -0.36]). Signal intensity also significantly correlated with the individual subscores for 'cartilage structure' (P < 0.05, r = -0.32) and 'cartilage cells' (P < 0.05, r = -0.30) from the modified Mankin's score, but not significantly with subscores for 'staining' and 'tidemark'. Signal duration correlated significantly with total score (as a whole [P < 0.05, r = 0.34]), but not significantly with the score for cartilage structure (P = 0.0557, r = 0.29). The interval between signals reflected well the actual thickness of the plug site. The significant relationships between ultrasound signal intensity and scores suggest that early degenerative changes in plug cartilage and cartilage-like tissue, especially in the superficial layer, are detectable by high-frequency ultrasound assessment

    Cooking Vessels, Volumes, and Venues: Evidence from LM IIIC Kavousi Vronda and Karphi

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    Glowacki, K.T., and L.P. Day. “Cooking Vessels, Volumes, and Venues: Evidence from LM IIIC Kavousi Vronda and Karphi.” Abstract of paper read at Διατροφικές συνήθειες και πρακτικές στην Κρήτη διαχρονικά [Dietary Habits and Practices in Crete over Time], Museum of Cretan Ethnology, Voroi, Crete, Greece, September 9–10, 2017.Our understanding of diet and culinary practices at the Late Minoan IIIC settlement sites of Kavousi Vronda and Karphi is based upon several different types of physical evidence that have been recovered through excavation. These include the botanical and faunal remains of plants and animals available to and consumed by the inhabitants; ceramic vessels used for the cooking and consumption of food and drink; built and fixed cooking installations, such as hearths and ovens; and the architectural spaces within the settlements where food preparation and consumption most likely took place. Each type of evidence is, by itself, incomplete and dependent upon differential preservation resulting from site formation processes specific to each archaeological context. Taken together, however, they allow us to gain important insights into key aspects of food cultivation, provisioning, processing, preparation, and convivial practices on Crete in the 12th and 11th centuries BC. In this paper, we will compare and contrast the evidence for food preparation and dining at each site, paying special attention to the forms and sizes of ceramic vessels used for cooking and consumption

    НАПРАВЛЕНИЯ СОВЕРШЕНСТВОВАНИЯ ОБРУДОВАНИЯ ДЛЯ ФЛОТАЦИОННОГО ОБОГАЩЕНИЯ ТОНКОДИСПЕРСНыХ МАТЕРИАЛОВ

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    Проблема и ее связь с научными и практическими задачами. В связи с тем, что в поступающем на обогатительные фабрики сырье содержится до 30% ма-териала крупностью менее 1 мм, роль процесса флотации существенно возрас-тает. Этому способствует и возможность создания достаточно простых замкну-тых водно-шламовых схем, включающих флотацию в качестве основного эле-мента очистки оборотных вод. Многими исследованиями, которые проводились ранее и продолжают выполняться и в настоящее время, установлены направле-ния совершенствования этого достаточно сложного физико-химического про-цесс

    Transport anomaly in the low energy regime of spin chains

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    The anomalous thermal conductivity in spin chains observed in experiments is studied for the low temperature regime. In the effective dynamics with most realistic perturbations, the so-called Umklapp terms is irrelevant to reduce mean free path in the energy transport at even finite temperatures. This is consistent with large conductivities found in recent experiments. The Drude weight which is the prefactor in the divergent conductivity is calculated, and the temperature dependence is discussed.Comment: 4 pages, no figure. PRB, in pres

    Opacity effect on extreme ultraviolet radiation from laser-produced tin plasmas

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    Opacity effects on extreme ultraviolet (EUV) emission from laser-produced tin (Sn) plasma have been experimentally investigated. An absorption spectrum of a uniform Sn plasma generated by thermal x rays has been measured in the EUV range (9-19 nm wavelength) for the first time. Experimental results indicate that control of the optical depth of the laser-produced Sn plasma is essential for obtaining high conversion to 13.5 nm-wavelength EUV radiation; 1.8% of the conversion efficiency was attained with the use of 2.2 ns laser pulses.</p
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