752 research outputs found
Smoothly varying in-plane stiffness heterogeneity evaluated under uniaxial tensile stress
No full textIdentification of spatially varying stiffness is a challenging, but important, research topic in the mechanics of materials and can provide the necessary information for material suitability, damage, and process control, especially for high-value applications. One homogeneous and 3 heterogeneous virtual field method (VFM) formulations were used to create a methodology for varying stiffness identification. Two finite element method simulations were used to demonstrate the validity and capability of the formulations. A tensile test protocol was implemented to identify spatially varying stiffness of uniaxial tensile paperboard specimens using digital image correlation. A recently published form of VFM, which enforces global equilibrium in the spatial frequency domain, was used to better examine smoothly varying stiffnesses. Two tensile specimens of a single commercial paperboard, known to contain heterogeneities, were examined, and local stiffnesses were identified. Examination of local equilibrium with VFM was used to explain differences in stiffness identification. A polyethylene terephthalate specimen was used to demonstrate homogeneity
Effect of Stabilizer on the Mechanical Properties of Rigid PVC
No full textTitle: Effect of Stabilizer on the Mechanical Properties of Rigid PVC, Author: Karl K.T. Woo, Location: ThodeIn this study commercial suspension polymerized polyvinyl chloride resin with different stabilizer contents was first compounded and injuctioned molded into small dumbbell shape specimens. Most of the specimens after annealing were then tested on the Instron Tensile Tester while the rest on iniature Tensile Tester for difference in mechanical properties. Four parameters from the stress-strain curves were of interest in this study: tensile yield stress, tensile modulus, elongation at fracture and ultimate fracture strength. The differences in mechanical properties were explained by the change in molecular structure of polyvinyl
chloride brought about by the reaction between the stabilizer and PVC molecules. In the second part of the experiment, the effects of heat treatment and molecular weight on the mechanical properties of rigid PVC were also investigated.ThesisMaster of Engineering (ME
Learning and teaching in Hong Kong: what is and what might be
No full textpublished_or_final_versionList of contributorsAcknowledgements Daw, J.B.B. Daw, J.B.B.Preface Daw, J.B.B. Daw, J.B.B. iOverviewWhat isLanguage mattersWhat might beReview and conclusionsCh.1 The nature of student learning: a conceptual framework Biggs, John Biggs, John Watkins, David Watkins, David 3Ch.2 Inside the classroom: the students' view Tang, Tommy Tang, Tommy 35Ch.3 Do teachers' beliefs influence students' learning? Tang, Thomas, K.W. Tang, Thomas, K.W. 53Ch.4 How examinations affect students' approaches to writing Fan, Flora H.K. Fan, Flora H.K. 67Ch.5 Coping with workload and time constraints Lee, Amelia Lee, Amelia 77Ch.6 The effects of English medium in the primary school years on later achievement Chan, How-kei Chan, How-kei 89Ch.7 Teaching history in the mother tongue Cheng, Belinda C.Y.S. Cheng, Belinda C.Y.S. 101Ch.8 What makes a good reader? Wong, Hebe Wong, Hebe 113Ch.9 The place of knowledge of genre in the teaching of writing Morgan, Moira Morgan, Moira 133Ch.10 Classroom environment and approaches to learning Chan, Grace Chan, Grace 153Ch.11 The place of mastery learning in teaching biology Lai, Patrick, L.K. Lai, Patrick, L.K. 164Ch.12 Cooperative learning in a geography class Lai, Edith Lai, Edith 177Ch.13 Restructuring misconceptions in physics Tang, David K.T. Tang, David K.T. 189Ch.14 What might these studies mean for the theory and practice of education in Hong Kong? Biggs, John Biggs, John Watkins, David Watkins, David 20
Показники дисфункції ендотелію у хворих на хронічну критичну ішемію нижніх кінцівок = Endothelial dysfunction indicators in patients with chronic critical limb ischemia
No full textGoni S.-K.T. Показники дисфункції ендотелію у хворих на хронічну критичну ішемію нижніх кінцівок = Endothelial dysfunction indicators in patients with chronic critical limb ischemia Journal of Education, Health and Sport. 2016;6(10):485-492. eISSN 2391-8306. DOI http://dx.doi.org/10.5281/zenodo.165834
http://ojs.ukw.edu.pl/index.php/johs/article/view/3982
The journal has had 7 points in Ministry of Science and Higher Education parametric evaluation. Part B item 755 (23.12.2015).
755 Journal of Education, Health and Sport eISSN 2391-8306 7
© The Author (s) 2016;
This article is published with open access at Licensee Open Journal Systems of Kazimierz Wielki University in Bydgoszcz, Poland
Open Access. This article is distributed under the terms of the Creative Commons Attribution Noncommercial License which permits any noncommercial use, distribution, and reproduction in any medium,
provided the original author(s) and source are credited. This is an open access article licensed under the terms of the Creative Commons Attribution Non Commercial License
(http://creativecommons.org/licenses/by-nc/4.0/) which permits unrestricted, non commercial use, distribution and reproduction in any medium, provided the work is properly cited.
This is an open access article licensed under the terms of the Creative Commons Attribution Non Commercial License (http://creativecommons.org/licenses/by-nc/4.0/) which permits unrestricted, non commercial
use, distribution and reproduction in any medium, provided the work is properly cited.
The authors declare that there is no conflict of interests regarding the publication of this paper.
Received: 02.09.2016. Revised 24.09.2016. Accepted: 30.10.2016.
УДК: 617.58-005.04-036.12-089
ПОКАЗНИКИ ДИСФУНКЦІЇ ЕНДОТЕЛІЮ У ХВОРИХ НА ХРОНІЧНУ КРИТИЧНУ ІШЕМІЮ НИЖНІХ КІНЦІВОК
С.-К.Т. Гоні
Харківський національний медичний університет
Кафедра хірургії №2, Харків
Резюме
В статті оцінені рівні прямих та опосередкованих показників ендотеліальної дисфункції (ендотелін-1, VEGF, фібриногену та С-реактивний білок) у 29 хворих на хронічну критичну ішемію нижніх кінцівок з дистальною формою ураження судинного русла у віці від 59 до 84 років. Хворі були обох статей, з них 12 (41,4%) - хворі на облітеруючий атеросклероз та ЦД. Показано, що незалежно від стадії ішемії та наявності ЦД, у хворих, що досліджувалися, виявлено порушення вазомоторної функції ендотелію (за даними рівня ендотелін-1), підвищення проліфераційної активності ендотелію (за даними рівня VEGF), порушення гемостатичної (за даними рівня фібріногену) та прозапальної функції ендотелію (за даними рівня С-реактивного білку)
Ключові слова: критична ішемія нижніх кінцівок, ендотеліальна дисфункція, ендотелін-1, васкулоендотеліальний фактор росту, фібриноген, С-реактивний білок
ENDOTHELIAL DYSFUNCTION INDICATORS IN PATIENTS WITH CHRONIC CRITICAL LIMB ISCHEMIA
S.-K.T. Goni
Kharkiv National Medical University, Ministry of Health of Ukraine ,
Department of Surgery № 2
Abstract
This article shows the results of determination of levels of direct and indirect indicators of endothelial dysfunction (ET1, VEGF, fibrinogen and CRP) in 29 patients with chronic critical limb ischemia with distal type of lesion of the vascular bed, aged from 59 to 84 years. Patients were of both sexes, of which 12 (41.4%) - patients with atherosclerosis and diabetes. It is shown that regardless of the stage of ischemia and the presence of diabetes in patients who were investigated, breach of vasomotor endothelial function (according to the level of endothelin-1), increased proliferative activity of endothelium (according to the level of VEGF), a violation of hemostatic (according to the level of fibrinogen) and proinflammatory endothelial function (based on C-reactive protein) was shown.
Keywords: сritical limb ischemia, endothelial dysfunction, endothelin-1, VEGF, fibrinogen, C-reactive protei
POD-based analysis of flow past street canyons and buildings: flow feature isolation and its impact on pollutant dispersion
No full textAtmospheric pollution has emerged as a critical environmental issue in the present era. As indicated by the World Health Organization in 2022, roughly whole universal contaminant (99%) is vulnerable to air that fails to meet the standard of living .Beyond decreasing automotive exhaust, enhancing road contaminant diffusion has been affirmed as an efficacious approach to mitigate such well-being venture.This work conducts LES based on ROM technique POD to model the traffic-induced flow field within a street canyon. The phenomenon mechanism is investigated by extracting the corresponding dominant modes. The flow pattern predicted by LES ideally accords with the skimming flow (SF) regime identified by previous field measurements and mathematical modeling results, which often occurs when the aspect ratio H/W is higher than 0.7. The results show that the flow pattern of POD mode 1, the most influential mode, contains several dominant frequencies and captures approximately 14% of the energy. It respectively leads to the flow acceleration near the stagnation point and the separation area caused by the blocking effect, and the forced separation caused by the upstream structure. In addition, this mode also controls the flow reattachment above the downstream structure to a certain extent. The frequency with the highest amplitude is 0.68 Hz, which is associated with the highly coherent structure existing in the flow field; Contaminant density behind structure arrangements depends on wind corridors. Smaller wind corridors enhance the acceleration of nearby airflow, while the reattachment phenomenon between adjacent corridors becomes unstable, resulting in a reduced impact range. A wider wind corridor can effectively reduce air contaminants in city areas, with removal effectiveness directly related to corridor breadth.</p
Effect of buffer layers on electrical, optical and structural properties of GaN/GaN heterostructures grown on Si
No full text
Environmental planning, management and technology in Hong Kong
No full textpublished_or_final_versionThe contributors vAcknowledgements viPreface Wong, David O.Y. Wong, David O.Y. Hills, Peter Hills, Peter viiKeynote speech Barnes, G. Barnes, G. ixPt.1 Environmental planning and management 1Pt.2 Air pollution and radiation in Hong Kong 53Pt.3 Waste disposal and water pollution in Hong Kong 87Environmental protection - Hong Kong 1987 Reed, Stuart B. Reed, Stuart B. 3Town planning and the environment Pun, K.S. Pun, K.S. 23Law and the control of the Hong Kong environment Downey, M. Downey, M. 35Impact assessment of major air pollution sources in Hong Kong Fung, Y.S. Fung, Y.S. 55Research findings on traffic-related air pollution near the entrance of the Hong Kong Cross Harbour Tunnel Chan, L.Y. Chan, L.Y. Chiu, H.M. Chiu, H.M. Palmer, W.A. Palmer, W.A. 67Gamma radiations from soil in Hong Kong Lau, S.Y. Lau, S.Y. Leung, K.C. Leung, K.C. Tang, C.H. Tang, C.H. 75Safety disposing of Hong Kong's Hazardous wastes Keen, C.Y. Keen, C.Y. Palmer, W.A. Palmer, W.A. 89Fishermens' children and lead poisoning Yeung, C.Y. Yeung, C.Y. Yu, C.L. Yu, C.L. Fung, K.W. Fung, K.W. Ho, K.S. Ho, K.S. 107Need pig wastes pollute? Hodgkiss, I.J. Hodgkiss, I.J. Griffiths, D.A. Griffiths, D.A. 115Enteric bacteria decay in seawater and outfall design Wong, S.H. Wong, S.H. 127Treatment of wastewater from small and medium-sized bleaching and dyeing factories Chiu, H. Chiu, H. Tsang, K.L. Tsang, K.L. Lee, M.L. Lee, M.L. 137Mathematical and experimental modelling of some environmental problems Lee, J.H.W. Lee, J.H.W. Jayawardena, A.W. Jayawardena, A.W. Chan, K.T. Chan, K.T. 15
Advancing Methods For Evaluating Flood Risk Reduction Measures
No full textFlood risk reduction systems are applied worldwide to reduce flood risk and provide protection of flood prone areas. More and more, decision makers use risk-based approach for the design and implementation of interventions in these systems. This dissertation advances existing risk-based approaches for specific interventions within a flood risk reduction system. Highlights of this dissertation include i) quantifying the reliability of canal levees, ii) evaluating the effectiveness of emergency measures, iii) optimizing portfolios (of combinations) of risk reduction strategies: flood defences and/or land fills and iv) assessing the performance of innovative interventions for flood risk reduction.Hydraulic Structures and Flood Ris
- …
