The great asymmetric divide: An empirical investigation of the link between indigenous and non‐indigenous economic systems in Northern Australia

This empirical study explores financial links between indigenous and non‐indigenous economic systems in a remote river catchment in Northern Australia (the Mitchell). It finds evidence of a profound and asymmetric ‘disconnect’ between these economies: an exogenous increase in indigenous incomes raises the incomes of non‐indigenous people, but the reverse is not true. Evidently, those seeking to improve the incomes of indigenous people in Northern Australia cannot simply seek to (i) increase payments to indigenous people, or (ii) expand the non‐indigenous sector hoping that some benefits will ‘trickle down’. Instead, structural change is required.     

Directed 2D-to-3D pattern transfer method for controlled fabrication of topologically complex 3D features in silicon

A process that allows control over the 3D motion of catalyst nanostructures during metal-assisted chemical etching by their local pinning prior to etching is demonstrated. The pinning material acts as a fulcrum for rotation of the catalyst structures resulting in etching of silicon features with rotational geometry.     

PLGA/Ag nanocomposites: in vitro degradation study and silver ion release

New nanocomposite films based on a biodegradable poly (DL-Lactide-co-Glycolide) copolymer (PLGA) and different concentration of silver nanoparticles (Ag) were developed by solvent casting. In vitro degradation studies of PLGA/Ag nanocomposites were conducted under physiological conditions, over a 5 week period, and compared to the behaviour of the neat polymer. Furthermore the silver ions (Ag⁺) release upon degradation was monitored to obtain information on the properties of the nanocomposites during the incubation. The obtained results suggest that the PLGA film morphology can be modified introducing a small percentage of silver nanoparticles that do not affect the degradation mechanism of PLGA polymer in the nanocomposite. However results clearly evinced the stabilizing effect of the Ag nanoparticles in the PLGA polymer and the mineralization process induced by the combined effect of silver and nanocomposite surface topography. The Ag⁺ release can be controlled by the polymer degradation processes, evidencing a prolonged antibacterial effect.     

Voltage Distribution among the Coils and Turns of a Form Wound AC Rotating Machine Exposed to Impulse Voltage

This paper describes a method of calculating voltage distribution in a stator winding exposed to impulse voltage. In this method, the voltage distribution in an equivalent-circuit representation of the stator winding is calculated. The winding is treated as an infinite number of identical coils connected in series, with each coil represented by an equivalent circuit including inductance, turn-to-ground capacitance and conductance, and with mutual inductance, capacitance, and conductance between turns. The impulse voltage is approximated by a Fourier series of components. The voltage distribution for each component is calculated, and the complete voltage distribution is obtained by summing the voltages due to each component. The complete calculating procedure, including the calculation of the equivalent circuit parameters has bee programmed in Basic language for computer calculation. Examples of the coil and turn voltages distributions calculated by this program and a comparison of calculated data with test data for a particular stator winding are included.     

Photothermal nanoblade for large cargo delivery into mammalian cells

It is difficult to achieve controlled cutting of elastic, mechanically fragile, and rapidly resealing mammalian cell membranes. Here, we report a photothermal nanoblade that utilizes a metallic nanostructure to harvest short laser pulse energy and convert it into a highly localized explosive vapor bubble, which rapidly punctures a lightly contacting cell membrane via high-speed fluidic flows and induced transient shear stress. The cavitation bubble pattern is controlled by the metallic structure configuration and laser pulse duration and energy. Integration of the metallic nanostructure with a micropipet, the nanoblade generates a micrometer-sized membrane access port for delivering highly concentrated cargo (5 × 10(8) live bacteria/mL) with high efficiency (46%) and cell viability (>90%) into mammalian cells. Additional biologic and inanimate cargo over 3-orders of magnitude in size including DNA, RNA, 200 nm polystyrene beads, to 2 μm bacteria have also been delivered into multiple mammalian cell types. Overall, the photothermal nanoblade is a new approach for delivering difficult cargo into mammalian cells.     

Vapor Phase Metal‐Assisted Chemical Etching of Silicon

This work introduces and explores vapor phase metal‐assisted chemical etching (VP‐MaCE) of silicon as a method to bypass some of the challenges found in traditional liquid phase metal‐assisted chemical etching (LP‐MaCE). Average etch rates for Ag, Au, and Pd/Au catalysts are established at 31, 70, and 96 nm/min respectively, and the relationship between etch rate and substrate temperature is examined experimentally. Just as with LP‐MaCE, 3D catalyst motion is maintained and three‐dimensional structures are fabricated with nanoparticle‐ and lithography‐patterned catalysts. VP‐MaCE produces less microporous silicon compared with LP‐MaCE and the diffusion/reduction distance of Ag⁺ ions is significantly reduced. This process sacrifices etch rate for increased etch uniformity and lower stiction for applications in micro‐electromechanical systems (MEMS) processing.     

Do Psychosocial and Study Skill Factors Predict College Outcomes? Comment on Robbins et al. (2004).

Evidence is cited in support of the claim that the results of the meta-analyses conducted by S. B. Robbins et al. (2004) are not generalizable to either baccalaureate-granting commuter institutions or certain demographically identified subgroups of students. (PsycINFO Database Record (c) 2010 APA, all rights reserved)     

Rectangular mode transformers in tapered single-mode fibres

A single-mode fibre, polished on both sides and subsequently tapered, yields a low-loss circular-to-rectangular mode transformer. This device should permit more efficient interconnection of circular fibres to rectangular integrated-optic and semiconductor waveguides.<>