نتایج جستجو برای: extraction efficiency

تعداد نتایج: 544647  

Journal: :Journal of Korea Technical Association of The Pulp and Paper Industry 2016

Journal: :journal of reports in pharmaceutical sciences 0
mostafa najafi afshin pashabadi

an ultrasound-assisted surfactant-enhanced emulsification microextra- ction (uaseme) coupled with high performance liquid chromatography-diode array detection has been developed for the extraction and determination of thiopental in serum and urine samples. a simple microextraction method based on emulsification of organic extraction solvent in aqueous sample using an ionic surfactant and withou...

Journal: Journal of Herbal Drugs 2013
Jila Asghari, Mohammad Salehi Mohsen Mazaheri Tehrani

Background & Aim: A simple and rapid microwave- assisted extraction (MAE) procedure was developed and optimized for the isolation of borneol and bornyl acetate from Ferulago macrocarpa. Ferulago macrocarpa (Apiaceae) is an endemic plant in Iran. Experimental: Dried powdered aerial parts of plants were soaked in water and irradiated with microwave in a Clevenger extraction app...

2011
Matthew Solomon Luis Gravano Cong Yu

The entity attribute extraction problem, or how to extract entities and their attribute values from natural language Web documents, is of critical importance for Web search and information access in general. Unfortunately, because of the noisy nature of theWeb and its scale, entity attribute extraction is notoriously challenging in terms of both extraction efficiency and quality. In our earlier...

A solid phase extraction sorbent based on polyaniline/graphene nanocomposite is presented. The structure and morphology of synthesized nanocomposite were investigated by Fourier transform infrared spectroscopy, field emission scanning electron microscopy, X-ray diffraction and thermal gravimetric analysis. The dispersive solid phase extraction was employed to the isolation and preconcentration ...

Journal: :analytical and bioanalytical chemistry research 0
mir ali farajzadeh department of analytical chemistry, faculty of chemistry, university of tabriz, tabriz, iran maryam abbaspoura abbaspour department of analytical chemistry, faculty of chemistry, university of tabriz, tabriz, iran mohammad reza afshar mogaddama afshar mogaddam department of analytical chemistry, faculty of chemistry, university of tabriz, tabriz, iran ali akbar alizadeh nabil alizadeh nabil food and drug laboratories, tabriz university of medical sciences, tabriz, iran

an air–assisted liquid–liquid microextraction method for the extraction and preconcentration of trace amounts of some synthetic phenolic antioxidants in biological fluids followed by their determination by gas chromatography–flame ionization detection has been reported. in this method the target analytes are extracted into a few microliters of carbon tetrachloride (extraction solvent) from an a...

2012
Zhibin Wang Yang Hao Zhongdong Wang Xian Liu Qian Zhang Dandan Zhu

To improve the light extraction efficiency of light-emitting diodes (LEDs), grating patterns were etched on GaN and silver film surfaces. The grating-patterned surface etching enabled the establishment of an LED model with a double-grating displacement structure that is based on the surface plasmon resonance principle. A numerical simulation was conducted using the finite difference time domain...

Journal: :international journal of environmental research 2010
v. eyupoglu b. eren e. dogan

artificial neural networks (anns) are computer techniques that attempt to simulate the functionality and decision-making processes of the human brain. in the past few decades, artificial neural networks (anns) have been extensively used in a wide range of engineering applications. there are only a few applications in liquid membrane process. the objective of this research was to develop artific...

2016
Xing LI Jun LI JianHong LUO Yang JIN Da ZOU

Solvent extraction using organic solvents is an important technology for the purification of wet process phosphoric acid (WPA). In this study, the purification process of WPA, using a new type of solvent extraction system, cyclohexanol diluted in kerosene, was investigated. The equilibrium phase diagram of the system H3PO4 H2Osolvent mixtures at 313.2K was obtained. The effects of extraction ...

Journal: :journal of sciences, islamic republic of iran 2012
l. lokwani

a new series of noncyclic ionophores containing two to four furan units (ia to iiib) i.e. 1,1-difurylethane (ia), 2,5-bis(methylfurfuryl)furan (iia) and 1,1’ ethyledenebis[5-(methylfurfuryl)furan] (iiia), 2,2-difurylpropane (ib), 2,5-bis (dimethylfurfuryl)furan(iib), 2,2’-isopropylidenebis[5-(dimethylfurfuryl)furan] (iiib) have been synthesized by the condensation of furan with acetaldehyde and...

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