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Experimental Investigation of the Impact of Compression on the Petro-Physical and Micromechanical Properties of Wellbore Cement Containing Salt  [PDF]
Arome Oyibo, Mileva Radonjic
Open Journal of Composite Materials (OJCM) , 2016, DOI: 10.4236/ojcm.2016.63006
Abstract: In this study, we investigated the effect of compression on the micromechanical and the petro- physical properties of salted wellbore cement systems. The experiments were conducted using a customized bench scale model, which utilized an expandable tubulars simulating the compression of a previously cemented casing under field-like conditions. The “mini-wellbore model” sample consisted of a pipe inside pipe assembly with a cemented annulus. The cement samples were cured in a water bath for 28 days prior to the compression experiments to allow adequate hydration. The impact of compression on the cement’s petro-physical and mechanical properties was quantified by measuring the porosity, permeability and hardness of salt cement cores drilled parallel to the orientation of the pipe from the compacted cement sheath. Permeability (Core-flood) experiments were conducted at 21℃, 10,342 kPa confining pressure for a period of 120 minutes. During the core-flood experiments, conducted using Pulse-decay method, deionized water was flowed through cement cores to determine the permeability of the cores. The results obtained from these experiments confirmed that the compression of the cement positively impacted the cements ability to provide long term zonal isolation, shown by the effective reduction in porosity and permeability. Furthermore, the results confirm reduction in the detrimental effect of salt on the strength and stiffness in post-compression cement.
The Effectiveness of Mobile Learning in the Form of Performance Support System in Higher Education
Nevena Mileva
International Journal of Interactive Mobile Technologies (iJIM) , 2011, DOI: 10.3991/ijim.v5i4.1692
Abstract: Students in engineering education need high-quality educational materials, and what is the most important, continually up-to-dated courses. The students need a possibility to self-assess their skills and knowledge as the learning steps for improvement - the courses, will provide them knowledge on the newest achievements in the field of engineering. The complexity of the knowledge and skills, necessary to perform successfully the tasks, determines the learners’ needs of “practical learning”. The view of learning process, as а performance-centered, is highly effective as a means of providing students in engineering education timely and relevant information. Performance-centered educational systems have a strong potential to help students mastering job-related skills. This paper presents m-learning as a form of performance support system for educational and training purposes in higher education. m-Learning solutions integrate mobile devices within the learning process to help students perform a task by providing information, guidance, and learning experiences when and where they are needed.
Realization of Multistage FIR Filters using Pipelining-Interleaving
M. Ciric,V. Radonjic
Telfor Journal , 2012,
Abstract: Multistage digital filters can be one of the solutions for the realization of filters with a narrow transition zone. If requirements for the width of transition zone are too strict, then they are the only alternative, and the decimation/interpolation must be performed in several steps. Combining decimation/interpolation operations related to the implementation of multi-channel filters in the PI (pipelining/interleaving) technique can give an efficient structure of multichannel multistage filter. Using the advantages offered by newer generations of FPGA chips in terms of digital design structure, it is possible to realize such filters with considerable savings of hardware resources and reduce the effect of finite length codeword. This paper proposes such an efficient implementation and presents the results of such a realization with FPGA components.
Reply to 'Comments on Integer SEC-DED codes for low power communications'
Aleksandar Radonjic,Vladimir Vujicic
Mathematics , 2012,
Abstract: This paper is a reply to the comments on 'Integer SEC-DED codes for low power communications'.
The city as a motif in Slovene youth literature
Milena Mileva Bla?i?
Urbani Izziv , 2003,
Abstract: The article presents the city as motif of Slovenian youth literature in four different periods, beginning in the first period of original Slovenian youth literature in the second half of the 19th century, second period in the first half of the 20th century, third period in the second half of the 20th century and after 1950, when significant books were produced in the field of short modern stories, emphasising on picture books and realistic narrative prose, and the fourth period after 1990. A discernable shift can be observed in the thirties of the 20th century, during the times of socialist realism. The most significant change occurred after 1960, when massive migration from rural to urban environments caused by industrialisation began. The motif of urban environment especially marked modern realistic narrative, coined problematic narrative after 1990, with its focus on issues of growing up in such environments. The city as motif or theme doesn’t appear only in realistic narrative, but since the early 20th century also in fantastic narrative, thus it dichotomically presents the image of real world in Slovenian youth realistic narrative.
Motiv mesta v slovenski mladinski knji evnosti
Milena Mileva Bla?i?
Urbani Izziv , 2003,
Abstract: V prispevku je prikazan motiv mesta v slovenski mladinski knji evnosti v tirih razli nih obdobjih, od za etkov v prvem obdobju izvirne slovenske mladinske knji evnosti v drugi polovici 19. stoletja, v drugem obdobju oziroma v prvi polovici 20. stoletja, v tretjem obdobju oziroma po letu 1950, ko nastanejo bistvene kratke sodobne pravljice s poudarkom na slikani ki knji ni izdaji in realisti ni pripovedni prozi in v etrtem obdobju oziroma po letu 1990. Vidni premik je v 30. letih 20. stoletja oziroma v asu socialnega realizma. Izrazitej e mno i ne selitve iz va kega okolja v mestno zaradi industrializacije so opazne po letu 1960. Motiv urbanega okolja je po letu 1990 posebno zaznamoval sodobno realisti no pripoved, imenovano problemska pripovedna proza, z osredoto enostjo tudi na problematiko sodobnega odra anja v tem okolju. Motivno-tematsko se mesto ne pojavlja le v realisti ni pripovedi temve tudi v fantasti ni pripovedi e od za etkov 20. stoletja. Slovenska mladinska realisti na pripoved tako dihotomi no spremlja podobo realnega mesta.
Shuttle radar topography mission: Availability of data and the accuracy achieved
Samard?i? Mileva,Milenkovi? Milutin
Glasnik Srpskog Geografskog Dru?tva , 2010, DOI: 10.2298/gsgd1001051s
Abstract: This paper aim is to determine accuracy of digital terrain model (DTM) formed upon Shuttle Radar Topography Mission (SRTM) data, for the region of the Republic of Serbia. Main characteristics of SRTM will be introduced, along with short description of determining DTM based on SRTM data and accuracy of such derived digital terrain model. .
Effects, experiences, and impact of stigma on patients with bipolar disorder
Mileva VR, Vázquez GH, Milev R
Neuropsychiatric Disease and Treatment , 2013, DOI: http://dx.doi.org/10.2147/NDT.S38560
Abstract: ts, experiences, and impact of stigma on patients with bipolar disorder Original Research (1597) Total Article Views Authors: Mileva VR, Vázquez GH, Milev R Video abstract presented by Roumen Milev Views: 90 Published Date January 2013 Volume 2013:9 Pages 31 - 40 DOI: http://dx.doi.org/10.2147/NDT.S38560 Received: 27 September 2012 Accepted: 19 November 2012 Published: 17 January 2013 Viktoria R Mileva,1 Gustavo H Vázquez,2 Roumen Milev3 1Psychology, School of Natural Sciences, University of Stirling, Stirling, UK; 2Department of Neurosciences, University of Palermo, Buenos Aires, Argentina; 3Department of Psychiatry, Queen's University, Kingston, ON, Canada Background: Many people with mental illness experience stigma that has impacted their lives. In this study, we validated the Inventory of Stigmatizing Experiences (ISE) as a tool to help quantify the stigma experienced by patients with bipolar disorder and its impact on their lives. The ISE has two components, ie, the Stigma Experiences Scale (SES) and the Stigma Impact Scale (SIS), which were administered to a population of Argentinean patients with bipolar disorder. We characterized the differences between these two populations using the SES and SIS. Finally, we compared SES and SIS scores with those in a population of Canadian patients with bipolar disorder. Methods: The SES and SIS scales were administered to tertiary care patients with bipolar I and II disorder in Argentina (n = 178) and Canada (n = 214). Results: In this study, we validated both SES (Kuder–Richardson coefficient of reliability, 0.78) and SIS (Cronbach's alpha, 0.91) scales in a population of Argentinean patients with bipolar disorder. There were no significant differences in stigma between patients with bipolar I or II disorder on SES or SIS. However, over 50% of all respondents believed that the average person is afraid of those with mental illnesses, that stigma associated with mental illness has affected their quality of life, and that their self-esteem has suffered due to stigma. In comparison with the Canadian population, Argentinean participants scored lower on both the SES and SIS, which may be due to cultural differences or to differences in population characteristics. Conclusion: Stigma associated with mental illness is serious and pervasive. If we are to find successful strategies to mitigate stigma, it is first important to understand how patients perceive such stigma. The ISE is a valuable tool which allows us to do this with high reliability among cultures.
Knowledge-Based Control Systems via Internet Part I. Applications in Biotechnology
Svetla Vassileva,Georgi Georgiev,Silvia Mileva
Bioautomation , 2005,
Abstract: An extensive approach towards the dissemination of expert knowledge and coordination efforts to distributed points and seamless integration of control strategies applied to distributed yet identical systems is crucial to enhance overall efficiency and operational costs. Application of Knowledge-Based Control System via Internet will be very efficient especially in biotechnology, because many industrial bioprocesses, based on the same technological principles, are distributed in the whole world. Brewing industry oriented practical solutions illustrate this approach.
A new, space-efficient local pairwise alignment methodology
D. Stojanov,A. Mileva,S. Koceski
Advanced Studies in Biology , 2012,
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