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Permanent URI for this collectionhttps://hdl.handle.net/20.500.14411/19

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Browsing Scopus by browse.metadata.publisher "Academic Journals"

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    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.
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    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.