Global ETD Search
Search theses and dissertations gathered from participating repositories worldwide. Every result links back to the library that holds it. No account is needed.
Results
Showing 1 to 20 of 107 for “"Extraction efficiency"”.
-
Improving the external extraction efficiency of organic light emitting devices
… state-of-the-art OLEDs can demonstrate external extraction efficiencies that surpass those of fluorescent lights. Additionally, OLEDs have the benefits over conventional display and lighting technologies of large viewing angles and mechanical flexibility. However, in order to become a …
-
Fundamental factors affecting the extraction efficiency in a pulse liquid-liquid extractor
… of plates, and the plate-free-area on the stage efficiency of the column. The optimum liquid flow rates were also determined. An examination of the literature was conducted for a review of the available information on pulse extractors. Although a great deal of literature was available on the …
-
Factors affecting the extraction efficiency of an experimental, liquid-liquid, sieve-plate, pulse extractor
… the ternary system acetone-toluene-water in the extraction of acetone from toluene using distilled water, to determine the operating characteristics of a pulse extraction column, and to determine the effects of solvent-to-feed ratio, feed concentration, and pulse amplitude on the overall mass …
-
Analysis of Light Extraction Efficiency Enhancement for Deep Ultraviolet and Visible Light-Emitting Diodes with III-Nitride Micro-Domes
… laser diodes. The limitation occurred in light extraction efficiency of III-nitride LEDs is attributed to the large refractive index difference between III-nitride semiconductor and free space, which leads to significant total internal reflection at the semiconductor and air interface. This …
-
Comparison of extraction efficiency using ethanol and methanol for the extraction of mycosporin-like amino acids (MAAs) from Palmaria palmata
… The present study aimed to evaluate and compare efficiency of ethanol and methanol as extraction solvent for MAAs from Palmaria palmata. Dried and fresh seaweed biomass was subjected to solvent extraction using ethanol and methanol under identical conditions. The extracts were filtered and …
-
Ice Concentration Linked with Extractive Stirrer (ICECLES)
… of certain analytes. These include liquid-liquid extraction (LLE), solid phase extraction (SPE), solid phase micro extraction (SPME), and stir bar sorpitive extraction (SBSE). Even though these techniques have advantages, some analytes are still extremely difficult to analyse at the trace and …
-
Predicting the Distribution Coefficient of Solvent Extraction of Rare Earth Elements Based on the Gibbs Free Energy and Thermodynamic Theory for Equilibrium Constant
… into their components is achieved by the solvent extraction process, consisting of the organic phase and aqueous phase. Leaching is a process by which REEs are dissolved in acid. The final product of the leaching process (leachate) is sent to the solvent extraction process. The leachate and …
-
Lipid Production from a Louisiana Native Chlorella vulgaris/Leptolyngbya sp. Co-culture for Biofuel Applications
… optimizing irradiance and nitrogen levels, lipid extraction method and modeling of pilot photobioreactor (HISTAR). Effects of irradiance and nitrate nitrogen levels on total lipid yield, neutral lipid portion, and fatty acid profile of non-aerated and aerated co-cultures were investigated in bench …
-
Metal ion complexation, extraction and transport by crown and lariat ether compounds
… sulfonyl lariat ether carboxamides upon the extraction efficiency and selectivity was explored in solvent competitive extraction. Very high Na* selectivity and extraction efficiency were achieved for N-(R)sulfonyl sym-(alkyl)dibenzo-16-crown-5-oxyacetamides. N-(R)sulfonyl lariat ether …
-
Application of organic acid functionalized cellulose for batch and aqueous two-phase extraction of sulfonamides from different matrices
… cellulose was 25°C, 180 min and 5 mg and with extraction efficiency of 70 and 51%, respectively. The optimal conditions for adsorption of sulfachloropyradazine and sulfabenzamide using oxalic acid functionalized cellulose was 25°C, 30 min and 50 mg with extraction efficiency of 64 and 75%, …
-
Development of a sample enrichment probe method for the gas chromatography-mass spectrometry analysis of hormones in water
… were estrone, I 7P-estradiol and testosterone. Extraction of the steroid hormones was performed by direct immersion of the SEP in water samples. To maximise the extraction efficiency of the SEP method to extract the analytes, several parameters affecting the extraction efficiency of the SEP …
-
An assessment of a liquid-liquid extraction procedure for the gas chromatographic analysis of chloroform in algal media
… in aqueous samples by the liquid-liquid extraction (LLE) method developed by Glaze at North Texas State University. A Bendix gas chromatograph (GC) was used. The factors examined were the effect of the ionic strength of the sample on the extraction method, the relative extraction …
-
Efficiency of PAHs removal from clayey soil using supercritical fluid extraction
… and the remediation process. The difficulty in extraction of HOC (hydrophobic organic compounds) from clay material was reported. Therefore, the SFE (supercritical fluid extraction) has a potential to substitute classical methods. The efficiency of using SFE (ISCO 200 model) for clay soil …
-
Removal of microorganisms and proteins from sewage and industrial waste with chlorinated solvents
… to settle for a specified period of time. The efficiency of the solvent extraction process was evaluated in terms of reduction of suspended solids, biochemical oxygen demand, and by increased weight of residue separable by sedimentation. The results showed that the process produced the …
-
Design and fabrication of one-dimensional and two-dimensional photonic bandgap devices
… consist of light-emitting devices with enhanced extraction efficiency. Fabrication techniques such as gas source molecular beam epitaxy, direct-write electron-beam lithography, reactive ion etching and thermal oxidation of AlxGa1-xAs have been employed. The III-V thermal oxide, in particular, is …
-
Evaluation of potential applications for templated arrays of heterostructural semiconductor nanowires as light emitting devices
… and performance (both the internal quantum efficiency and the extraction efficiency) are evaluated. Business models for development of nanowire arrays for light emitting devices are discussed.
-
Development of membrane extraction techniques for water quality analysis
… water quality analysis. Gas injection membrane extraction was developed for fast on-line analysis of volatile organic compounds in water. Gas injection of aqueous samples increased the speed of membrane extraction. The aqueous boundary layer effects encountered during water elution was reduced. …
-
Protein extraction using reverse micelles
… micelles is of considerable advantage in protein extraction. A lot of researches have been done with ionic reverse micelles applied in protein extraction. However, this ability of non-ionic reverse micelles has not been fully understood and therefore requires more research. In this project, …
-
Electrochemical speciation and quantitative chromatography for modelling of indium bioleaching solutions
… modelling to improve indium leaching and extraction efficiency. Indium stability constants and chemical conditions of process relevant solutions were required. Electrochemical methods were used to determine the stability constants of indium complexes with nitrate, chloride, sulfate, and …
-
APPLICATION OF LAYERED DOUBLE HYDROXIDES IN SOLID-PHASE EXTRACTION
… various sample preparation methods, solid-phase extraction (SPE) is one of the most popular techniques. It has been in use for many decades and yet is able to meet new challenges, such as minimization solvent and sorbent specifically and improvement in the work flow of laborious operations. …
Page 1 of 6