Yazar "Aydin, F." seçeneğine göre listele

Listeleniyor 1 - 9 / 9
  • [ X ]
    Öğe
    The Basic Properties of Transesterified Corn Oil and Biodiesel-Diesel Blends
    (Taylor & Francis Inc, 2011) Aydin, F.; Kafadar, A. B.; Erdogan, S.; Saydut, A.; Kaya, C.; Hamamci, C.
    Biodiesel, one of green fuels and clean energies, is compatible with traditional petroleum-based diesel and both can be completely blended without any stratification. Biodiesel was prepared from corn by transesterification of the crude oil with methanol in the presence of NaOH as catalyst. Transesterified corn oil has better properties globally because it has the greater monounsaturated content. Determination of blend levels is one important issue to the quality control of biodiesel due to the increase of biodiesel-diesel blends commercialization. The objective of this study was to characterize how the key fuel properties changed when the commercial petroleum diesel fuel was blended with methyl ester produced from corn oil. In the present study, commercially available diesel fuel was blended with the biodiesel prepared from corn oil. The blends of biodiesel petroleum diesel were prepared on a volume basis. The important properties of corn oil methyl ester (biodiesel)-diesel fuel blends, such as density and kinematic viscosity, are found out and compared to those of No. 2 petroleum diesel, ASTM, and EN biodiesel standards.
  • [ X ]
    Öğe
    DETERMINATION OF VANADIUM IN TURKISH ASPHALTITES
    (Estonian Academy Publishers, 2010) Aydin, I.; Aydin, F.; Kilinc, E.; Hamamci, C.
    Vanadium is found in many rocks and minerals, including asphaltite. Asphaltite is one of the naturally occurring black, solid bitumens, which are soluble at heating in carbon disulfide and fuse. Asphaltite is also a solidified hydrocarbon compound derived from petroleum. Determination of vanadium in asphaltite ash was performed by microwave-acid digestion followed by inductively coupled plasma-optical emission spectrometry (ICP-OES) and flame atomic absorption spectrometry (FAAS). Asphaltites from Avgamasya, Harbul, and Seguruk deposits in SE Anatolia of Turkey have been investigated. Concentrations of vanadium in Avgamasya, Harbul, Seguruk asphaltite bottom ashes were determined using ICP-OES to be 5.871, 4.324, 2.777 g kg(-1), respectively.
  • [ X ]
    Öğe
    DETERMINATION OF VOLUME OVERLOAD BY BIOELECTRICAL IMPEDANCE ANALYSIS AND NT-PROBNP IN DIABETIC PRE-DIALYSIS PATIENTS
    (Editura Acad Romane, 2016) Yildirim, Y.; Kara, A. V.; Kilinc, F.; Aydin, F.; Aydin, E.; Yilmaz, Z.; Kadiroglu, A. K.
    Introduction. Diabetic chronic kidney disease has more fatal clinical progresses and this situation can be related to volume overload, which is seen more commonly in diabetic chronic kidney disease patients than in non-diabetic chronic kidney disease patients. Therefore, we examined the effect of diabetes mellitus on volume overload in newly diagnosed stage 5 chronic kidney disease patients whose volume overloads were not showing signs of improvement from renal replacement therapy. Method. One hundred and five patients (46 diabetic, 59 non-diabetic) with end-stage chronic kidney disease, who had glomerular filtration rate (GFR) under 15 mL/min for at least three months were enrolled in this prospective study. We determined the body volume overload and configuration using a bioimpedance device. NT-proBNP levels were recorded. Results. There was a statistically significant difference between diabetic and non-diabetic groups according to overhydration (OH, p=0.003), extracellular water (ECW, p=0.045), intracellular water (ICW, p<0.001) and OH/ECW (p=0.003). In addition, there was a statistically significant difference between groups in terms of N-terminal Pro-brain Natriuretic Peptide (NT-proBNP levels, p=0.008). Discussion. We compared diabetic and non diabetic end-stage chronic kidney disease patients who were not in renal replacement therapy yet. We found more volume overload and extracellular fluid volume in the diabetic group.
  • [ X ]
    Öğe
    Effect of homogeneous alkaline catalyst type on biodiesel production from soybean [Glycine max (L.) Merrill] oil
    (Natl Inst Science Communication-Niscair, 2016) Saydut, A.; Kafadar, A. B.; Aydin, F.; Erdogan, S.; Kaya, C.; Hamamci, C.
    Transesterification or alcoholysis is the most commonly applied method for biodiesel production. A catalyst is needed to improve the transesterification reaction and yield. The present study used soybean oil as the raw oil to mix with methanol and four strong alkali catalysts (NaOH, KOH, CH3ONa & CH3OK) to undergo a transesterification reaction. Transesterification was carried out using 100% :excess alcohol, i.e., molar ratio of alcohol to soybean oil was 6:1, and, catalyst concentration of 1% at 60 degrees C. Alkali metal alkoxides were found to be more effective transesterification catalysts compared to hydroxides. Sodium methdxide was the most efficient catalyst, although KOH and NaOH could also be used because they are cheaper and are used widely in large scale processing:
  • [ X ]
    Öğe
    Effects of Sewage Sludge used as Fertilizer on Heavy Metal Contents of Bird's-Foot Trefoil (Lotus corniculatus L.) and Soil
    (Asian Journal Of Chemistry, 2012) Saruhan, V.; Gul, I.; Kusvuran, A.; Aydin, F.
    This study was carried out to determine the effects of the sludge which was provided from a wastewater refinement facility of Municipality of Diyarbakir on bird's-foot trefoil plant production and its soil properties. For this purpose, the increasing level of sewage sludge has been applied to the soil samples which are taken from the plant rotation field of Dicle University campus area in Turkey and this sludge was left. At the end of study, the chemical properties of the soil have been determined and the results have been compared statistically. In this study three times reiterated randomized blocks design type has been established in the pod to determine the effects of the sludge to the plants and also the mineral content (Hg, Cr, Zn and Ni) of bird's-foot trefoil plant. The sludge that was applied to the soil with increasing amounts, raised the heavy metal content of bird's-foot trefoil plant, but this raising did not line-out for allowable limit.
  • [ X ]
    Öğe
    From mg/kg to pg/kg Levels: A Story of Trace Element Determination: A Review
    (Taylor & Francis Inc, 2011) Bakirdere, S.; Aydin, F.; Bakirdere, E. G.; Titretir, S.; Akdeniz, I.; Aydin, I.; Yildirim, E.
    Determination of the trace elements in a variety of environmental samples is of great importance. Most elements, including iron, calcium, and selenium, are crucial for the regulation of human mechanisms, and many others, like lead and cadmium, are toxic even at trace levels. Some elements, like selenium, have a narrow margin of safety. Hence, determination of elements at trace levels is crucial in any matrix related to humans. Trace element determination requires sufficiently sensitive procedures to monitor trace levels. This review aims to highlight not only the development in instrumentation for ultratrace element determination in variety of matrices but the application of developed techniques. Advantages and disadvantages of the techniques are also discussed.
  • [ X ]
    Öğe
    Molybdenum Speciation in Coal Bottom Ash Using a Sequential Extraction Procedure and Determination by FAAS
    (Taylor & Francis Inc, 2013) Aydin, F.; Saydut, A.; Gunduz, B.; Aydin, I.; Erdogan, S.; Hamamci, C.
    Coal bottom ash contains many elements that exist in different forms, which may change throughout the coal combustion process. This study presents the concentration and speciation of molybdenum in bottom ash of coal. Determination of total molybdenum was performed by two-stage microwave-acid digestion followed by flame atomic absorption spectrometry. A sequential extraction process to speciation of molybdenum from coal bottom ash was investigated. The most abundant form of molybdenum in samples is sulfide fraction of molybdenum. Relative abundances of the remaining fractions follow the order: Residual > Reduciple > Oxidizable > Exchangeable > Carbonate > Water soluble.
  • [ X ]
    Öğe
    Removal of cadmium and lead from aqueous solution by calcite
    (Hard, 2007) Yavuz, Oe.; Guzel, R.; Aydin, F.; Tegin, I.; Ziyadanogullari, R.
    The removal of toxic cadmiurn(II) and lead(II) from aqueous solutions was investigated using calcite, which is inexpensive and widespread over the globe, as the effective inorganic adsorbent. The experimental data of the removal equilibrium were correlated by either the Langmuir or Freundlich equations. Results indicate that the Langmuir model gave a better fit to the experimental data than the Freundlich equation. Maximum adsorption capacities were determined as 18.52 mg/g Cd and 19.92 mg/g Pb for natural calcite at 25 degrees C, respectively.
  • [ X ]
    Öğe
    Stability-indicating high performance thin layer chromatographic determination of sulfanilamide in human urine
    (Maik Nauka/Interperiodica/Springer, 2009) Kilinc, E.; Gumgum, B.; Hamamci, C.; Aydin, F.
    A simple, sensitive, selective, precise and stability-indicating high-performance thin-layer chromatographic (HPTLC) method was developed and applied to human urine for the densitometric determination of sulfanilamide. A mixture of chloroform-ethyl acetate-xylene (2.5: 4.0: 1.0, v/v/v) was used as a mobile phase. The system was found to give compact spots for sulfanilamide (retardation factor, R (f) = 0.21 +/- 0.02). The linear regression analysis data for the calibration plots showed good linear relationship with r (2) = 0.9970 +/- 0.0003 and r (2) = 0.9947 +/- 0.020 within the concentration range of 50-250 ng per spot and 100-1000 ng per spot with respect to peak area, respectively. The limit of detection (LOD) and quantification (LOQ) were 8 and 25 ng per spot, respectively. Sulfanilamide was subjected to acid and alkali hydrolysis, oxidation, dry heat and wet heat treatment. According to the International Conference on Harmonization (ICH) guidelines the method was validated for precision, recovery and robustness. The ultraviolet (UV) spectra of the degradation products which had different spectra from sulfanilamide were also recorded.