Chinese students in a UK business school: hearing the student voice in reflective teaching and learning practice.

This paper presents the outcomes of a study carried out in 2001-2002 with nine postgraduate students from China, enrolled on taught master's programmes in a UK university business school. The aims of the research were to explore the development of the students' orientations to learning during their year of study in the UK, and to explore how the researcher's interactions with the study group contributed to her professional reflections and influenced her academic practice. The main conclusions of the project were that participants' underlying approaches to learning did not change substantially over the year, owing to the culturally implicit nature of UK academic conventions and that they experienced high levels of emotional isolation and loneliness, which affected their academic confidence

preparationofvanadiumoxalatebysolventextractionandpurificationwithp507anditsphysicochemicalproperties

Vanadium oxalate is an ideal precursor used for the preparation of vanadium containing catalysts, advanced phase change material of VO2, high performance VN and other vanadium based chemical products. Currently, few research on the preparation of VOC2O4 was found to be reported. In this study, highly pure vanadium oxalate was prepared through "extraction-stripping-evaporative crystallization" method using 2-ethylhexyl dihydrogen phosphate(P507) as the extractant and H2C2O4 as the stripping reagent from a vanadium leach solution obtained by sodium roasting and water leaching of vanadium titano-magnetite slags. V(IV) stripping from the loaded P507 solution with H2C2O4 was emphatically studied and the stripping conditions were optimized. The result showed that vanadium could be almost completely (99. 98%) stripped at an A/O ratio of 1 :5 and 50 degrees C using 2. 0 mol/L oxalic acid solution in three stages (theoretical). The concentration of VOC2O4 would reach 290 g/L in the loaded strip liquor. The vanadium oxalate was characterized by X-ray diffraction (XRD), energy dispersive spectrometer(EDS), field emission scanning electron microscope (SEM) and synchronous thermal analyzer(TGA-DSC). The result showed that vanadium oxalate was VOC2O4 center dot 2H(2)O and it had high purity, good crystallinity and average particle size distribution

Preparation of Vanadium Oxalate by Solvent Extraction and Purification with P507 and Its Physicochemical Properties

Vanadium oxalate is an ideal precursor used for the preparation of vanadium containing catalysts, advanced phase change material of VO2, high performance VN and other vanadium based chemical products. Currently, few research on the preparation of VOC2O4 was found to be reported. In this study, highly pure vanadium oxalate was prepared through "extraction-stripping-evaporative crystallization" method using 2-ethylhexyl dihydrogen phosphate(P507) as the extractant and H2C2O4 as the stripping reagent from a vanadium leach solution obtained by sodium roasting and water leaching of vanadium titano-magnetite slags. V(IV) stripping from the loaded P507 solution with H2C2O4 was emphatically studied and the stripping conditions were optimized. The result showed that vanadium could be almost completely (99. 98%) stripped at an A/O ratio of 1 :5 and 50 degrees C using 2. 0 mol/L oxalic acid solution in three stages (theoretical). The concentration of VOC2O4 would reach 290 g/L in the loaded strip liquor. The vanadium oxalate was characterized by X-ray diffraction (XRD), energy dispersive spectrometer(EDS), field emission scanning electron microscope (SEM) and synchronous thermal analyzer(TGA-DSC). The result showed that vanadium oxalate was VOC2O4 center dot 2H(2)O and it had high purity, good crystallinity and average particle size distribution

Effect of pH on the Interaction of Gold Nanoparticles with DNA and Application in the Detection of Human p53 Gene Mutation

<p>Abstract</p> <p>Gold nanoparticles (GNPs) are widely used to detect DNA. We studied the effect of pH on the assembly/disassembly of single-stranded DNA functionalized GNPs. Based on the different binding affinities of DNA to GNPs, we present a simple and fast way that uses HCl to drive the assembly of GNPs for detection of DNA sequences with single nucleotide differences. The assembly is reversible and can be switched by changing the solution pH. No covalent modification of DNA or GNP surface is needed. Oligonucleotide derived from human p53 gene with one-base substitution can be distinguished by a color change of the GNPs solution or a significant difference of the maximum absorption wavelength (&#955;_max), compared with wildtype sequences. This method enables detection of 10 picomole quantities of target DNA.</p