The doping characteristics and carrier transport in a GaAs p-n junction were visualized with a approximately 10 nm spatial resolution, using light-modulated scanning tunneling spectroscopy. The dynamics of minority carriers under operating conditions, such as recombination, diffusion, and electric field induced drift, which had previously been analyzed on the basis of empirical electric propert...

Dry powder inhaler (DPI) is generally formulated as a powder mixture of coarse carrier particles and micronized drug with aerodynamic diameters of 1-5 μm. Carrier particles are used to improve drug particle flowability, thus improving dosing accuracy, minimizing the dose variability compared with drug alone and making them easier to handle during manufacturing operations. Lactose is the most co...

For the solvent extraction of copper from pregnant leach solutions, (PLS) a wide range modern extractants is currently offered on market, and its choice very important issue in production using SX-EW (Solvent Extraction Electrowinning) technology. The purpose this work was to determine optimal extractant for processing productive solutions Almaly deposit SX-EW. studies were carried out with sol...

the possibility of terahertz generation has been investigated from a photoconductive switch based on gaas, gated by a femtosecond laser. the emission properties of photoconductive antenna (pca) with low-temperature-grown (lt) gaas have been studied. in such gaas materials presence of the charged defects induces a redistribution of the electric field between the antenna electrodes. this effect h...

berberine was loaded in yeast cells of saccharomyces cerevisiaeas a novel pharmaceutical carrier to improve the treatment ofmany diseases. the yeast-encapsulated active materialsshowedhigh stability and bioavailability due to the enhanced solubility and sustained releasing. in this study, different characteristics of prepared berberine loaded yeast cells (loading capacity, release kinetic order...

A sensitive and reliable method is described for the determination of ochratoxin A (OTA) in maize. An extraction and clean-up procedure was used, with chloroform-phosphoric acid as the extractant, and liquid-liquid partition and anion-exchange chromatography (SAX columns) for the clean-up. Quantification of toxin is achieved by high performance liquid chromatography (HPLC). Recoveries were betw...

Carbazole-based materials adopting the nonconjugated substitution of triphenylsilyl (-SiPh(3)) and trityl (-CPh(3)) side groups are studied as high-triplet-energy, morphologically, and electrochemically stable host materials with tunable carrier-transport properties for organic blue electrophosphorescence. The developed host materials 9-(4-tert-butylphenyl)-3,6-bis(triphenylsilyl)-9H-carbazole ...

Density-functional theory (DFT) is employed to investigate the structural, electronic, and transport properties of several isomeric fluoroarene-oligothiophene-based semiconductors. Three oligothiophene systems varying in the perfluoroarene group positions within the molecule are studied to understand the electronic structure leading to the observed mobility values and to the n- or p-type behavi...

Solvent extraction is the most widely used method for separation and purification of rare earth elements, organic extractants such as di(2-ethylhexyl) phosphoric acid (P204) di(1-methyl-heptyl) methyl phosphonate (P350) are commonly industrial applications. However, presence impurity ions in feed liquid during can easily emulsify extractant affect quality products. Aluminum ion common liquid, i...