Filters

2010 - 20114
Reset filters

Settings

COAR Access Rights: metadata only accessPublisher: Academic Journals

Search Results

Now showing 1 - 4 of 4
  • Thumbnail Image
    Article
    Citation - WoS: 14
    Citation - Scopus: 17
    Cementation in a Matrix of Loose Sandy Soil Using Biological Treatment Method
    (Academic Journals, 2011) Gurbuz, Ayhan; Sari, Yasin Dursun; Yuksekdag, Zehra Nur; Cinar, Berat; Department of Civil Engineering
    Man-made materials varying from cement-based to chemical-based have been injected into soils to improve their engineering properties (shear strength, compressibility, permeability, bearing capacity etc.). Soil type in general plays important role in determination of treatment material and method. Materials used for soil treatment might have side effects in terms of air pollution, soil or water contamination etc. during manufacturing or application. An alternative, environmentally friendly soil treatment method that is based on the use of bacteria present in soils and named Biological Treatment Method (BTM) has been used by researchers to bond particles of loose sandy soils via creation of calcite (CaCO3) generated by bacteria using urea to influence the precipitation of calcium carbonate. This study presents the results of bacterial induced cementation (BIC) in matrix of loose sandy soil. A bacterium used in this study is Sporosarcina pasteurii that is naturally present in soils and is aerobic type. The bacteria grown in laboratory environment were injected to the matrix of loose sandy soil. Subsequent nutrient mediums were introduced to specimens to accelerate the development of cementation level. Number of bacteria, pH level, temperature and amount of CaCO3 were measured during the duration of testing. Images of Scanning Electron Microscope (SEM) showed that creation of cementation from precipitation of CaCO3 on the surface and pores of soil matrix were observed for only sand samples into which nutrient was flushed on sequence of arbitrary time.
  • Thumbnail Image
    Article
    Citation - WoS: 3
    Citation - Scopus: 6
    The Predictive Impact of Socio-Demographic and Behavioural Factors on Professionals' E-Commerce Attitudes
    (Academic Journals, 2010) Akman, Ibrahim; Rehan, Mohammad; Information Systems Engineering; Computer Engineering
    This paper first reviews the e-commerce issues in general and then gives a detailed report of the findings of a survey concerning how sociodemographic (gender and income) and behavioural (computer experience and average daily use of the Internet) factors influence e-commerce attitude of professionals. The survey was conducted among professionals from the government and private sectors. The results indicated that income is significantly related to the usage of e-commerce. Additionally, computer experience and average daily use of the internet were found to be significant in explaining usage reason for e-commerce users whereas the variable income was found to be significant in explaining nonusage reason for e-commerce nonusers.
  • Thumbnail Image
    Review
    Citation - WoS: 7
    Enterprise Application Integration (eai), Service Oriented Architectures (soa) and Their Relevance To E-Supply Chain Formation
    (Academic Journals, 2010) Rehan, Mohammad; Akyuz, Goknur Arzu
    The greatest challenge of e-supply chain formation is the integration of cross-application processes in a seamless manner. As platform independent, web-based interoperability are becoming key issues in web-based integration and supply chain formation, organisations are in search of architectural solutions to overcome these challenges. Thus, this paper focuses on the service oriented architectures (SOA) as the recent trend in cross-platform enterprise application integration. SOA paradigm is discussed in detail with special focus on e-supply chain formation. Findings indicate that SOA still appears as the most convenient paradigm to meet the challenges of today's e-supply chain formation requirements.
  • Thumbnail Image
    Article
    Citation - WoS: 2
    A Model To Evaluate Supply Chain Performance and Flexibility
    (Academic Journals, 2011) Bac, Ugur; Erkan, Turan Erman
    In present day's global competitive environment, enterprises have to focus on their supply chain performance to have a competitive advantage. Improving the effectiveness of the system is the only way to do so and, for this purpose, ongoing supply chain activities have to be inspected in pursuant of some performance measurements and metrics to cover the concept. There is a lack of effective mathematical models in the literature which enclose flexibility and its parameters in order to measure the performance of a supply chain by considering all of its vital elements. In this paper, a mathematical model is proposed to evaluate supply chain performance using some key performance indicators. This model can be used to evaluate the flexibility characteristics of logistic, market, supplier, machine, labor, information system, and routing of the supply chain.