نتایج جستجو برای: Direct precipitation technique
تعداد نتایج: 1059532 فیلتر نتایج به سال:
zno plays an important role in many semiconductors technological aspects. here, direct precipitation method was employed for the synthesis of nano-sized hexagonal zno particles, which is based on chemical reactions between raw materials used in the experiment. zno nanoparticles were synthesized by calcinations of the zno precursor precipitates at 250 ˚c for 3hours. the p...
Background: HDL-C measurement is important in cardiovascular diseases evaluation. Precipitation method is common procedure in this measurement, but direct method widely used nowadays. The aim of the present study was to compare the results of the two aforementioned techniques and their correlation. Materials and methods: During August 2006, serum HDL-C of 212 subjects (98 male, 114 female with ...
objective(s):the present study reports the development and validation of a sensitive and rapid extraction method beside high performance liquid chromatographic method for the determination of crocetin in human serum. materials and methods:the hplc method was carried out by using a c18 reversed-phase column and a mobile phase composed of methanol/water/acetic acid (85:14.5:0.5 v/v/v) at the flow...
Objective(s):The present study reports the development and validation of a sensitive and rapid extraction method beside high performance liquid chromatographic method for the determination of crocetin in human serum. Materials and Methods:The HPLC method was carried out by using a C18 reversed-phase column and a mobile phase composed of methanol/water/acetic acid (85:14.5:0.5 v/v/v) at the flow...
prediction of precipitation is very important. regarding to the non- linear relationships and uncertainty of models, there is no superior and persuasive model among various proposed models to simulate precise precipitation and its amount. wavelet is one of the novel and very effective methods in time series and signals analyzing, that has been considered in the field of hydrology in recent year...
We compared results by two methods for serum Al determination: matrix modification with direct calibration in a stabilized-temperature platform furnace (Clin Chem 28, 2139, 1982) and a technique involving extraction with nitric acid before atomic absorption spectrometry (Clin Chem 30, 1216, 1984). The two methods gave similar results with use of either a deuterium or a Zeeman system of backgrou...
ZnO plays an important role in many semiconductors technological aspects. Here, direct precipitation method was employed for the synthesis of nano-sized hexagonal ZnO particles, which is based on chemical reactions between raw materials used in the experiment. ZnO nanoparticles were synthesized by calcinations of the ZnO precursor precipitates at 250 ˚C for 3hours. ...
novement of the end of the bar (e) and assures a quick and positive movement of the valve when the vessel (d) moves from the "down" to the "up" position. A suitable counter weight is suspended from the bar (e). As indicated in the diagram, when the vessel (d) is in the "up" position air pressure from the compressed air main forces the culture solution up into the sand containers. As the solutio...
In this study, hydroxyapatite (HA) nanocrystals have been synthesized via chemical precipitation technique. Diammonium hydrogen phosphate and calcium nitrate 4-hydrate were used as starting materials and sodium hydroxide solution was used as the agent for pH adjustment. The powder sample was evaluated by techniques such as scanning electron microscope, transmission electron microscope, Fou...
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