Ferromagnetic properties of Y-doped ALN nanorods

Room-temperature ferromagnetism has been observed in Y-doped AlN (AlN:Y) nanorods. Our first-principle calculations have demonstrated that the ferromagnetism in AlN:Y is from Al vacancies and that the introduction of nonmagnetic rare-earth element Y into AlN can significantly reduce the formation energy of Al vacancy which leads to high Al vacancies responsible for the observed ferromagnetism in AlN:Y nanorods. These findings illustrate an efficient way to reduce the formation energy of cation vacancy by doping nonmagnetic elements, such as Y, leading to ferromagnetism in semiconductors.

Effect of gold on the corrosion behavior of an electroless nickel/immersion gold surface finish

The performance of surface finishes as a function of the pH of the utilized plating solution was evaluated by electrochemical impedance spectroscopy (EIS) and potentiodynamic polarization tests in 3.5 wt.% NaCl solution. In addition, the surface finishes were examined by x-ray diffraction (XRD), and the contact angle of the liquid/solid interface was recorded. NiP films on copper substrates with gold coatings exhibited their highest coating performance at pH 5. This was attributed to the films having the highest protective efficiency and charge transfer resistance, lowest porosity value, and highest contact angle among those examined as a result of the strongly preferred Au(111) orientation and the improved surface wettability.

Simultaneous synthesis of gold nanoparticles and conducting poly(3,4-ethylenedioxythiophene) towards optoelectronic nanocomposites

In this paper, a new method for obtaining poly(3,4-ethylenedioxythiophene) (PEDOT/PSS)/gold nanocomposites is described. In a first step, PEDOT/PSS gold nanoparticle aqueous dispersions were obtained by simultaneous chemical synthesis of PEDOT and gold nanoparticles in the presence of PSS that acts as a stabilizer. In a second step, these PEDOT/PSS gold nanoparticle dispersions were used to formulate nanocomposites by mixing the initial dispersion with commercially available PEDOT/PSS aqueous dispersion. Nanocomposite thin films, obtained by casting these dispersions, present an intimate contact between the inorganic and organic components

An exploration of the motivation to attend for spectators of the Lexmark Indy 300 champ car event, Gold Coast

The perceptions of spectators (N = 36) at the Lexmark Indy 300 Champ Car event were assessed via qualitative methods to evaluate their internal and external motivations to attend. The characteristics of the majority of attendees who were interviewed for this study were predominantly male, 26–35 years old, from Queensland, and who earned around AUD$50,000–75,000 per annum. The most common reason to attend was the atmosphere that the event created, in particular, the entertainment options. Other reasons included watching the race, the location, living nearby, attending with friends or family and interacting and socializing with other people who also attend. The findings revealed that participants attended to escape every day life, or that they were a ‘true fan’ of the motorsport. The findings of the study have implications for sport marketers who wish to communicate to those individuals in more targeted approaches for a more efficient and effective impact.

X-ray diffraction line broadening from gold and platinum thin films

X-ray diffraction line profile analysis has been used to study the microstructure of (Ill) oriented gold and platinum thin films deposited by thermal evaporation and DC magnetron sputtering. In addition to crystallite size broadening, the profiles from these films displayed broadening arising from dislocations. A parallel investigation, using transmission electron microscopy (TEM) was undertaken to study the nature of dislocations formed, and to provide information on the dimensions of the crystallite columns in the films. X-ray data were collected at room temperature to determine the anisotropy of the broadening with (hkl), using a Siemens D5000 powder diffractometer (CuKa radiation) and two high-resolution synchrotron instruments (BM 16 at the ESRF [A=0.35A] and station 2.3 at the Daresbury laboratory. Two approaches to instrument deconvolution were investigated; Fourier deconvolution and fundamental parameters profile fitting, using Lab6 as a reference material to determine the instrument profile function. After removal of the crystallite size broadening contribution from the measured integral breadths, the residual microstrain broadening was modelled assuming dislocations based on a FCC a/2<110>{ Ill} slip system. The results of the X-ray analysis agreed with dark field TEM micrographs, which showed that many of the crystallites contained dislocations of mixed character (screw- edge).

Sickness ruins the complexion, breeding disappears without gold: culture and the i nterpretation of illness among the Minangkabau of West Sumatra, Indonesia

The interpretation of illness and its meaning to individuals and groups is largely a product of culture and is based on shared experience, historical significance, and the social function of individuals in the community. West Sumatra, like many parts of Indonesia, has experienced rapid development and modernization since the nation achieved independence in 1945 and is currently 12 years into Regional Autonomy, a dramatic shift in national administration from a highly centralized system to one which devolved authority to the level of district or municipal government. These changes have brought Indonesians into contact with an increasingly globalized culture and have put pressure on traditional institutions and practices. This is especially significant in the area of health, where considerable tension exists between the allopathic conceptualization of health (as espoused by health care professionals in the formal sector) and traditional interpretations of health that derive from a traditional cultural and linguistic frame of reference. This paper, based on fieldwork in the Indonesian region of Tanah Datar, West Sumatra, describes the impact of cultural and linguistic factors on the interpretation of illness among rural residents and elucidates the growing impact of multiple systems of meaning in local understanding of health.