Mehmet İnanç Onur

Liquefaction Analysis by Using Laboratory Scale Shaking Table Test Device

Liquefaction is the one of the major problems in geotechnical engineering. Especially; deaths, structural damages and financial loss can occur after liquefaction. Therefore, liquefaction potential of the soils should be determined before the construction. In this study, silty sand soils were taken from the city of Eskisehir, Turkey. Reconstituted samples were tested by using laboratory scale shaking table test device. Liquefaction potential of the soil samples were determined and the test results were discussed.

Use of Sepiolite and Zeolite Mixtures as a Landfill Liner

This study presents an investigation into the possibility of using sepiolite and zeolite mixtures to design a landfill liner. Leakage from the impervious layer into the environment is the main difficulty of storing hazardous waste. Therefore, determining the impermeable layer and in-situ application procedure is very important and needs laboratory experimentation. For this purpose, a series of experiments have been conducted on a mixture of zeolite+sepiolite. The geotechnical, physico-chemical and micro-structural properties of 30% sepiolite by weight of zeolite have been determined through laboratory testing. At the end of the research, the results show that zeolitesepiolite mixtures can be effectively used in bottom lining systems for hazardous, industrial and municipal waste.

Design of Landfill Liner for Boron Mine Waste Water

The purpose of this study is to form the impermeable layer as landfill liner to store boron mine waste water. Boron mine waste water was supplied from Emet (district of Kutahya city, Turkey) Boron Factory. In this study, five different mixtures were used. These mixtures were natural soil, natural soil mixed with Na-bentonite (10%, 20%, 30% and 40%). A miniature landfill tank (240 cm × 120 cm × 60 cm) with six sections was constructed and mixtures were compacted in the container according to the optimum water content. After curing period, 120 liter boron mine waste water was poured into each section and impermeability of mixtures was observed. As a result of observations, it was seen that natural soil was totally inefficient material. Natural soil started leaking on the fifth day and waste water was completely leaked within 27 days. Natural soil mixed Na-bentonite (40%) mixture gave the best result among them. The thickness of impermeable layer formed with natural soil mixed Na-bentonite (40%) can be offered between 40 and 60 cm for the in-situ application.

Development of clinical engineering units and evaluation of the organization in public hospitals

Educational opportunities in the field of biomedical engineering and biomedical technician have been increased today. The concept of clinical engineering was born and gain a rapid development stage due to the employment of personnel trained in this area in health facilities. The importance of clinical engineering units that provide or control purchasing of medical equipment, checking and acceptance procedures, maintenance and calibration services in hospitals increases day by day. In this study, role of the clinical engineering unit on the operation and development of the technical and biomedical infrastructure of health institutions is firstly highlighted. Also, unit configurations in public hospitals, operation formats, problems in the development process and solutions are discussed. Current situation and operational structure of the clinical engineering, a joint point of engineering and medical science, in public hospitals with differs from units in other institutions are evaluated. At the end of the study, benefits and development of clinical engineering units in public hospitals were presented.

COMPUTER-AIDED ECCENTRICITY CALCULATION FOR THE MAT FOUNDATIONS

Mat (raft) foundations are chosen in case of insufficient allowable bearing capacity and settlement criteria of individual and combined footings. In addition, to obtain more economical foundation design mat foundations are used where the area of combined foundation exceeds 50~60 % of the entire area of foundation. Eccentricity is defined as the location of resultant loads does not coincide with the center of gravity of the building that can cause major problems such as tilting and overturning on the structure. Calculations can be obtained without error in a short time with the help of algorithms generated one time by using software during the design processes. In this study, software is prepared for the eccentricity calculations of mat foundation design using the infrastructure of Visual Basic 2005 Express Edition. The combinations of thirty-six different loading algorithms are prepared to create the program. Thus, all loading conditions for dead loads, live loads and earthquake loads are considered. In addition, the analysis is provided in a more visual understanding for the user by adding the option of displayed results in graphically. As a result, calculations of eccentricity by hand take much time. It can be determined faster and more accurate by using this software.