Arama Sonuçları

On some of the factors influencing the fines' role on liquefaction of silty sands

Monkul, M.M.

Conference Object | 2012 | Geotechnical Special Publication ( 225 GSP ) , pp.799 - 808

Silty sands are among the soil types that are prone to liquefaction when subjected to static or dynamic undrained loading. Today, it is widely accepted that clean sands and silty sands react differently in terms of liquefaction behavior. With this observation, factors influencing fines' role on such a difference have been investigated by various researchers. Some of those factors such as laboratory specimen preparation method and confining stress are relatively well understood. However, some others such as fines content (FC) are still debated and being investigated. More explicitly, there is not a widely accepted consensus on whethe . . .r increasing fines content increases or decreases the liquefaction resistance of silty sands, even with the same comparison basis (i.e. loosest possible density after deposition, same void ratio, same relative density etc.). Recently, relative size of silt grains to the sand grains is also found to be another factor influencing the fines' role on liquefaction behavior of silty sands. In this paper, some of the research in literature regarding liquefaction of silty sands is re-visited and various factors influencing the fines' role on liquefaction behavior are summarized. © 2012 American Society of Civil Engineers Daha fazlası Daha az

Evaluation of shalgam juice antiproliferative activity against a colon cancer cell line

Conference Object | 2012 | NEW BIOTECHNOLOGY29 , pp.799 - 808

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A VARIETY IN DELIVERY MODE IN LISTENING INSTRUCTION AND ITS EFFECT ON COMPREHENSION

Ozgur, B

Conference Object | 2012 | EDULEARN12: 4TH INTERNATIONAL CONFERENCE ON EDUCATION AND NEW LEARNING TECHNOLOGIES , pp.5022 - 5039

The effectiveness of instructional design for developing listening comprehension in English as a second language (L2) is of prime concern to language teachers. Several technology based instructional designs with the emphasis on distinct presentation of listening tasks are highlighted in literature. However, there are a lack of empirical studies to clarify issues concerning modality differences for foreign language (FL) learners and their effect on comprehension. Moreover, learners' listening performance may be affected by the modality in which the tasks are presented (extraneous cognitive load) or the amount of cognitive resources t . . .hat learners invest in schema construction and automation (germane cognitive load). Based on cognitive load theory, this study examines whether the subjects' listening performance varied when the instructional formats of listening tasks were presented in three different modalities. Listening with auditory materials only (LO), narrow listening (NL), listening with a full written script (LFS) were employed to evaluate the subjects' listening performance. This study employs a mixed method design utilizing qualitative and quantitative tools including semi-structured interviews with test takers to assess the best facilitating modality for listening comprehension as well as post test scores to determine student performance. Two hundred and eight, intermediate and advanced level pre-service teacher candidates of English whose L1 was Turkish completed four tests through different representations that required them to listen to dialogues and to complete a number of multiple choice comprehension questions Daha fazlası Daha az

Improvement of PEMFC performance with Nafion/inorganic nanocomposite membrane electrode assembly prepared by ultrasonic coating technique

Devrim, Y. | Erkan, S. | Baç, N. | Eroglu, I.

Conference Object | 2012 | International Journal of Hydrogen Energy37 ( 21 ) , pp.16748 - 16758

Membrane electrode assemblies with Nafion/nanosize titanium silicon dioxide (TiSiO 4) composite membranes were manufactured with a novel ultrasonic-spray technique and tested in proton exchange membrane fuel cell (PEMFC). Nafion/TiO 2 and Nafion/SiO 2 nanocomposite membranes were also fabricated by the same technique and their characteristics and performances in PEMFC were compared with Nafion/TiSiO 4 mixed oxide membrane. The composite membranes have been characterized by thermogravimetric analysis, scanning electron microscopy, X-ray diffraction, water uptake, and proton conductivity. The composite membranes gained good thermal re . . .sistance with insertion of inorganic oxides. Uniform and homogeneous distribution of inorganic oxides enhanced crystalline character of these membranes. Gas diffusion electrodes (GDE) were fabricated by Ultrasonic Coating Technique. Catalyst loading was 0.4 mg Pt/cm 2 for both anode and cathode sides. Fuel cell performances of Nafion/TiSiO 4 composite membrane were better than that of other membranes. The power density obtained at 0.5 V at 75 °C was 0.456 W cm -2, 0.547 W cm -2, 0.477 W cm -2 and 0.803 W cm -2 for Nafion, Nafion/TiO 2, Nafion/SiO 2, and Nafion/TiSiO 4 composite membranes, respectively. Copyright © 2012, Hydrogen Energy Publications, LLC. Published by Elsevier Ltd. All rights reserved Daha fazlası Daha az

Effect of olive leaf extract treatment on oxidative stress in liver, heart and brain tissues of aged rats

Conference Object | 2012 | FEBS JOURNAL279 , pp.218 - 218

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Design of wideband low profile Ku band antenna array

M.M. Bilgic | K. Yegin | T. Turkkan | M. Sengiz

Conference Object | 2012 | IEEE Antennas and Propagation Society, AP-S International Symposium (Digest) , pp.218 - 218

Aperture coupled phased array antenna design at Ku band is introduced. The array spans entire Receive Band of Ku band (10.8 GHz - 12.75 GHz) and has a gain greater than 24.5 dBi with approximately 330×70×25 mm (LxWxH) dimensions. Low loss waveguide-microstrip type hybrid feed network is also designed and simulation results are presented. Aperture efficiency greater than 70% is achieved. © 2012 IEEE.

Fostering the endeavor: Architecture education for planetary exploration

Ozdemir, K.

Conference Object | 2012 | Proceedings of the International Astronautical Congress, IAC13 , pp.11013 - 11018

This paper aims to discuss the integration of architectural education into the human planetary exploration endeavour, through experiences on space architecture related workshops. As the planetary exploration mission perspectives are getting more ambitious than ever, the habitable assets of the mission architectures require augmented qualities of habitability and operational capabilities. Architectural education, by its nature, includes the comprehension, reformation and development of the habitable spaces. The spatial spectrum, in which the architecture is involved, is extended from conventional palette of structures, like residenti . . .al or industrial buildings to habitable hi- tech products of the contemporary, including aerospace structures. A planetary human outpost is no longer out of the scanning range of the architects. Therefore, the need to enrich the design education with adaptability to actual needs of the technology and progress is emerging. Within this scope, a series of workshops with students from architecture and neighbouring disciplines are made, focused on the planetary habitation systems. Based on the current planetary exploration objectives, various design options are considered and developed within a limited time frame, akin to typical design studio tasks of the architectural education. In this paper, the results of the workshops are presented in a comparative structure, giving the option to view the conditions of the working environment, such as effects of the feedbacks from different areas of expertise, the given design basis, production capabilities (e.g. hard-digital modelling, drawing). An evaluation of applied methods and an outlook on the further work is provided in the final section. Copyright © (2012) by the International Astronautical Federation Daha fazlası Daha az