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Failure mechanisms of externally prestressed composite beams with partial shear connection
A. Dall’Asta,L. Dezi,G. Leoni 국제구조공학회 2002 Steel and Composite Structures, An International J Vol.2 No.5
This paper proposes a model for analysing the non-linear behaviour of steel concrete composite beams prestressed by external slipping cables, taking into account the deformability of the interface shear connection. By assuming a suitable admissible displacement field for the composite beam, the balance condition is obtained by the virtual work principle. The solution is numerically achieved by approximating the unknown displacement functions as series of shape functions according to the Ritz method. The model is applied to real cases by showing the consequences of different connection levels between the concrete slab and the steel beam. Particular attention is focused on the limited ductility of the shear connection that may be the cause of premature failure of the composite girder.
The Quality Costs Assessment in the Aspect of Value Added Chain
( Asta Daunoriene ),( Egle Katiliute ) 한국품질경영학회 2015 한국품질경영학회 학술대회 Vol.2015 No.2
Purpose - The dynamism and chaos of organizational environment has been stated by the analytics of organizational performance. In order to survive in such rapidly changing environment, organizations have to adapt and be able to anticipate changes, to forecast probable activity scenarios that could provide maximum expected benefit. Acknowledging this, many innovative organizations have been involved in management and improvement activities consider the value chain which is based on interaction between the businesses processes functions and management activities. The managerial benefits of value chain analysis has been recognized many scientists still acknowledge that value chain management is inseparable from the investment that is directed towards quality and reduction of the loss that is as well as associated with quality. According to Campanella (1999) and Wood (2013) the assessment of the investment that is directed towards quality and the loss that is associated with quality can be made through application of the analysis of quality cost. However, it should be noted that quality costs aren□t analysed with the value chain activities in order to increase added value. This paper aim focus on the quality costs influence direction and intensity on the added value in the aspect of value chain. Methodology/approach - The article is based on a nomothetic point of view that includes three modules: conceptual, hypothetical - deductive and inductive methods. To formulate theoretical aspects of quality costs evaluation, comparative and chronological analysis of scientific literature is used. Empirical results of the research are obtained by applying method of expert evaluation. Findings - During expert evaluation procedure is identified and selected significant quality costs elements. It is a useful tool to identify quality costs thought value chain processes. Created model of quality costs assessment in the aspect of value added chain is based on identification and classification of quality costs elements and allows to measure and to evaluate influence of quality costs, its direction and intensity on added value. Research limitations/implications - The formulated model of quality costs assessment in the aspect of value added chain is assigned to the models that “are oriented towards the situation”, i.e. diverted towards organizational analyses. Originality/value - The paper complementing the gap between theoretical and practical framework of determining influence of quality costs on added value and proving importance of the assessment of quality costs elements in the aspect of added value chain.
Asta Blazyte,Abayomi Babatunde Alayande,Thanh-Tin Nguyen,Rusnang Syamsul Adha,장재원,Mar Mar Aung,김인수 한국공업화학회 2021 Journal of Industrial and Engineering Chemistry Vol.94 No.-
In the forward osmosis (FO) process, biofouling is well pronounced on the active side where wastewaterand seawater are used as feed and draw solution, respectively. However, the biofouling tendencies withinthe support layer are not clear. Therefore, the objective of this study was to investigate the effect of TEPpre-conditioning on hydophobicity and initial bacterial attachment of FO membrane support layer. Twostructurally distinct FO membranes from different manufacturers were preconditioned by soaking inartificial sea waterfiltrates containing size fractioned TEP. The conditioning solution pre-treated with a0.4 mm pore sizefilter, contributed to the highest bacterial adhesion rates during bacterial attachmenttesting in both steady state and cross-flow mode in a lab-scale FO system for both membrane types. CTA-ES support exhibited higher numbers of adhered bacteria when compared to PA-TFC support in a steadystate. Conversely, in cross-flow lab-scale testing, a negative impact of fouling on PA-TFC was moreapparent than the CTA-ES membrane. This was attributed to the higher porosity and surface roughness ofthe PA-TFC membrane. Overall, ourfindings reinforce the potential impact of hydrodynamics conditionsand membrane properties on the fouling behavior of FO membrane support layer.
Design and Implementation of University Internal Study Quality Management System
( Egle Katiliute ),( Asta Daunoriene ) 한국품질경영학회 2015 한국품질경영학회 학술대회 Vol.2015 No.2
Purpose - European study quality improvement process is encouraged by the aspiration of European countries to implement the Lisbon Strategy based on Bologna Declaration (1999), the Copenhagen Declaration (2002), the Berlin communication (2003) and other documents which generally requires University to take responsibility for the studies and research quality. The purpose of this paper is to characterize a designing and implementation of a University internal study quality management system elements, exploring how these elements was constructed and used for a study quality improvement. Methodology/approach - The methodology is based on a case study carried out through the analysis of the designing and implementing University internal study quality management system. Findings - This paper is based on a general framework of theoretically well - grounded constructs that could provide researches and authorities of universities deeper understanding of the internal study quality management system improvement practic s and presents the results of the EU funded project “The improvement of internal quality assurance system at Kaunas University of Technology”. These results reveal how the university study quality management system integrates different requirements of the Standards and Guidelines for Quality Assurance in the European Higher Education Area (ESG), EFQM Excellence Model, process management practices, the SA 8000 standard for social responsibility and other quality management tools/ techniques. Research limitations/implications -The results of case study are substantiated by the analysis of one case however; these results could be useful for all Universities. Originality/value - Based on the case study results, this study proposes a general framework of theoretically well - grounded constructs that could provide researches and Universities authority□s deeper understanding of the internal study quality management system improvement practices.
Thermochemical degradation of cotton fabric under mild conditions
Michael Cuiffo,정혜정,Asta Skocir,Theanne Schiros,Emily Evans,Elizabeth Orlando,Yu-Chung Lin,Yiwei Fang,Miriam Rafailovich,Taejin Kim,Gary Halada 한국의류학회 2021 Fashion and Textiles Vol.8 No.1
Textile waste presents a major burden on the environment, contributing to climate change and chemical pollution as toxic dyes and finishing chemicals enter the environment through landfill leachate. Moreover, the majority of textile waste reaching landfills is discarded clothing, which could be reused or recycled. Here we investigate environmentally benign morphology changing of cotton textiles as a precursor for reintegration into a circular materials economy. At 50 °C using low concentrations of acids and bases, the interfiber structures of woven cotton were successfully degraded when treated with the following sequence of chemical treatment: citric acid, urea, sodium hydroxide, ammonium hydroxide, and sodium nitrate. Fourier transform infrared spectroscopy (FTIR), Raman spectroscopy, X-ray photoelectron spectroscopy (XPS) and scanning electron microscopy (SEM) reveal separation of the constituent fibers without depolymerization of the cellulose structure, and streaming potential measurements indicate that surface charge effects play a key role in facilitating degradation. The proposed reaction procedures show feasibility of effective waste-fabric recycling processes without chemically intensive processes, in which staple fibers are recovered and can be re-spun into new textiles.
Regional TMPRSS2 V197M Allele Frequencies Are Correlated with COVID-19 Case Fatality Rates
Jeon, Sungwon,Blazyte, Asta,Yoon, Changhan,Ryu, Hyojung,Jeon, Yeonsu,Bhak, Youngjune,Bolser, Dan,Manica, Andrea,Shin, Eun-Seok,Cho, Yun Sung,Kim, Byung Chul,Ryoo, Namhee,Choi, Hansol,Bhak, Jong Korean Society for Molecular and Cellular Biology 2021 Molecules and cells Vol.44 No.9
Coronavirus disease, COVID-19 (coronavirus disease 2019), caused by SARS-CoV-2 (severe acute respiratory syndrome coronavirus 2), has a higher case fatality rate in European countries than in others, especially East Asian ones. One potential explanation for this regional difference is the diversity of the viral infection efficiency. Here, we analyzed the allele frequencies of a nonsynonymous variant rs12329760 (V197M) in the TMPRSS2 gene, a key enzyme essential for viral infection and found a significant association between the COVID-19 case fatality rate and the V197M allele frequencies, using over 200,000 present-day and ancient genomic samples. East Asian countries have higher V197M allele frequencies than other regions, including European countries which correlates to their lower case fatality rates. Structural and energy calculation analysis of the V197M amino acid change showed that it destabilizes the TMPRSS2 protein, possibly negatively affecting its ACE2 and viral spike protein processing.