Reinforcement of natural rubber with core-shell structure silica-poly(Methyl Methacrylate) nanoparticles

A highly performing natural rubber/silica (NR/SiO2) nanocomposite with a SiO2 loading of 2 wt% was prepared by combining similar dissolve mutually theory with latex compounding techniques. Before polymerization, double bonds were introduced onto the surface of the SiO2 particles with the silane-coupling agent. The core-shell structure silica-poly(methyl methacrylate), SiO2-PMMA, nanoparticles were formed by grafting polymerization of MMA on the surface of the modified SiO2 particles via in situ emulsion, and then NR/SiO2 nanocomposite was prepared by blending SiO2-PMMA and PMMA-modified NR (NR-PMMA). The Fourier transform infrared spectroscopy results show that PMMA has been successfully introduced onto the surface of SiO2, which can be well dispersed in NR matrix and present good interfacial adhesion with NR phase. Compared with those of pure NR, the thermal resistance and tensile properties of NR/SiO2 nanocomposite are significantly improved.

Beginning the search for core principles underpinning literacy development in the early years

Providing opportunities for all people to become literate is now a global imperative (World Bank 2008). There are many and varied reasons underlying this emphasis including global, national, community and personal perspectives (Friere & Macedo 2000) and countries world-wide are investing more money into their early childhood programs and the development of associated policies (Oberhuemer 2005). From a socio-cultural view, literacy development is emergent, ongoing (Cook-Gumperz 2006) and multifaceted (New London Group 1999). Literacy involves far more than reading and writing and encompasses listening, speaking and critical thinking (Department of Education, Science and Training 2005, Luke & Freebody 1997). Literacy is not merely a curricular area, but an important empowering life skill (Harrison 2012, Friere & Macedo 2000). It seems logical then, to search for and identify if there are core principles underpinning early years literacy development.In seeking to identify core principles for emergent literacy development, the study reported here adopted Wiersma & Jurs' (2005) 'Four Step' Historical Research methodological approach involving the identification of a research problem, collection and evaluation of source materials, synthesis of information from the source materials and finally, the analysis, interpretation and the formulation of conclusions. The historical research approach requires creative interpretation (Keastle 1988) and is valued for its effectiveness in sourcing ideas, enlightening current debates, empowering decision-making (Stricker 1992) and influencing policy formation (Wiersma & Jurs 2005).This study involved analysis of Early Years Language and Emergent Literacy Research from the past decade, sourced via education and social sciences databases, as well as information gathered from correspondence with Australian government departments, their websites and policies. The findings from a synthesis of these data sources led to the identification of nine core principles viewed as underpinning children's emergent literacy development. Interested in exploring the relevance and application of these principles to the field of early childhood in Australia, additionally, the researcher has embarked upon a mapping exercise that reveals how the recently introduced Early Years Learning Frameworks align with these principles. Furthermore, in recognition of the importance of the early years as a crucial time in a child's literacy development (Cook-Gumperz 2006, Raban & Nolan 2005, Hall, Larson & Marsh 2003), it is argued that these literacy principles will be valuable to the development of a range of educational tools to be used by Pre-service and practicing Early years educators.

A test of core assumptions of the catastrophic misinterpretation model of panic disorder

The catastrophic misinterpretation model of panic disorder proposes that spontaneous panic attacks are the result of misinterpretation of harmless autonomic arousal as precursors to physical (e.g. heart attack) or psychological (e.g. insanity) emergency. Mixed research findings to date have provided equivocal support. A modified form of the Body Sensations Interpretation Questionnaire was used to investigate core assumptions of the model amongst 38 people with panic disorder (PD), 20 with non-clinical panic, 21 with social anxiety disorder, and 34 non-anxious controls. The PD group gave more harm-related interpretations of ambiguous internal stimuli than all other groups only when anxiety-related responses (e.g. “I'm going to panic”) were scored as harm, however there was no evidence that anxiety-related interpretations were masking perceived catastrophic physical or psychological outcomes. Despite this, people with PD rated harm and anxiety outcomes as more negative than non-anxious controls. Results failed to unequivocally support core assumptions of the model.

Synthesis and characterization of tin dioxide core-shell structure nanowires

In this study, one-dimensional and quasi-one-dimensional tin dioxide nanowires and nan-owalls were fabricated by the use of the chemical vapor deposition technique. It was demonstrated that the growth and nanostructure of tin oxide can be controlled by varying the thickness of gold layer and the partial pressure of vapor at growing sites. Nanowires with a core-shell structure, i.e., pure tin core and tin oxide shell, were synthesized from C-S_nO₂ powders at a mol ratio of C/S_nO₂=3/5 on both silicon and Lanthanum Strontium Co-balt Ferrite ceramic wafers through the vapor-solid mechanism. The conditions that are favorable to the growth of core-shell structure nanowires are investigated.

Satellite tracking large numbers of individuals to infer population level dispersal and core areas for the protection of an endangered species

Aim: Tracking the dispersal patterns and habitat use of migratory species is necessary to delineate optimal areas for protection, with large sample sizes being more representative of the population. Here, we examine the dispersal patterns of a key Mediterranean loggerhead turtle (Caretta caretta) breeding population to identify priority foraging sites for protection. Location: Zakynthos Island, Greece and the wider Mediterranean. Method: We examined the dispersal patterns and foraging sites of 75 adult loggerheads (n = 38 males and 37 females) tracked from the breeding area of Zakynthos Island (Greece) from 2004 to 2011. We then combined our data with published sea turtle literature to identify key foraging sites for protection. Results: While both males and females exhibited similar dispersal patterns, about 25% males remained < 100 km of Zakynthos, whereas all females (except one) migrated > 200 km. Integration of our data with the wider literature isolated 10 core sites in proximity to existing protected areas, which could potentially protect 64% of the Zakynthos population, while five sites support individuals from at least 10 other loggerhead breeding populations. Main conclusions: Due to the widespread availability of neritic foraging grounds across the Mediterranean, sea turtles from Zakynthos exhibit disparate dispersal patterns. However, protecting only a few objectively defined important sites can encompass a large proportion of the foraging areas used and hence have considerable conservation benefit.