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Aysun Yılmaz

Graduate School of Natural and Applied Sciences
Investigation of thermoluminescence properties of metal oxide doped lithium triborate
Oezdemir, Zeynep; Yılmaz, Ayşen; Yılmaz, Aysun (2007-10-01)
In this study, lithium triborate (LiB3O5) doped with different metal oxides were investigated to explore its thermoluminescence properties. Solid-state reaction method was employed for the synthesis of the desired material...
Nitrogen cycling in the offshore waters of the Black Sea
McCarthy, James J.; Yılmaz, Aysun; Coban-Yildiz, Yesim; Nevins, John L. (2007-09-01)
The purpose of this study was to measure directly the rates of several of the processes responsible for the production and utilization of nitrogenous nutrients, and to use these rates and other data to generate an annual n...
Investigation of solid solution of ZrP2O7-Sr2P2O7
Seyyidoglu, Semih; Oezenbas, Macit; Yazici, Necmeddin; Yılmaz, Aysun (2007-08-01)
In this study, ZrP2O7 was synthesized by the solid state reaction of ZrO2 and NH4H2PO4 at 900 degrees C. Then, in set 1; 10, 5, 1, 0.5, 0.1, 0.05, 0.03% previously prepared Sr2P2O7 were doped into ZrP2O7, and Sr2P2O7 sligh...
Sulfated zirconia in SBA-15 structures with strong Bronsted acidity as observed by H-1 MAS NMR spectroscopy
Yılmaz, Ayşen; Erdem, Ozlen Ferruh; Yılmaz, Aysun; Michel, Dieter; Üner, Deniz (2007-05-01)
In order to prepare high surface area highly acidic catalysts, different weight loadings of ZrO2 were incorporated in the SBA-15 structures which are subsequently sulfated by treating in 0.25 M H2SO4. The catalysts were ch...
Production and identification of rare-earth doped lithium triborate
Yılmaz, Ayşen; Ozbayoglu, Gulhan; Ozdemir, Zeynep; Yılmaz, Aysun (2006-07-20)
Research in the field of non-linear optical (NLO) devices lead to an increasing interest in new borate compounds, capable of expanding the frequency range provided by common laser sources. Lithium triborate (LBO) is a newl...
Surface and mid-water sources of organic carbon by photoautotrophic and chemoautotrophic production in the Black Sea
Yılmaz, Aysun; Coban-Yildiz, Yesim; Telli-Karakoc, Fatma; Bologa, Alexandru (2006-01-01)
The multilayered surface waters of the Black Sea contain aerobic, suboxic and anoxic layers that support both photoautotrophic (PP) and chemoautotrophic (ChP) biological production. During the R/V Knorr cruise in May-June ...