Sizes and Shapes of Young Star Cluster Light Profiles in M83

We measure the radii and two-dimensional light profiles of a large sample of young, massive star clusters in M83 using archival HST/WFC3 imaging of seven adjacent fields. We use GALFIT to fit the two-dimensional light profiles of the clusters, from which we find effective (half-light) radii, core radii, and slopes of the power-law (EFF) profile ($\eta$). We find lognormal distributions of effective radius and core radius, with medians of $\approx$2.5 pc and $\approx$1.3 pc, respectively. Our results provide strong evidence for a characteristic size of young, massive clusters. The average effective radius and core radius increase somewhat with cluster age. Little to no change in effective radius is observed with increasing galactocentric distance, except perhaps for clusters younger than 100 Myr. We find a shallow correlation between effective radius and mass for the full cluster sample, but a stronger correlation is present for clusters 200-300 Myr in age. Finally, the majority of the clusters are best fit by an EFF model with index $\eta\leq3.0$. There is no strong evidence for change in $\eta$ with cluster age, mass, or galactocentric distance. Our results suggest that clusters emerge from early evolution with similar radii and are not strongly affected by the tidal field of M83. Mass loss due to stellar evolution and/or GMC interactions appear to dominate cluster expansion in the age range we study.Comment: 34 pages, 11 figures, 3 tables, accepted by MNRAS. Machine-readable table attached (full version of Table 3). To obtain, download the source file from the "Other formats" link abov

Evaluation of Osteoconductive Scaffolds in the Canine Femoral Multi-Defect Model

Treatment of large segmental bone defects remains an unsolved clinical challenge, despite a wide array of existing bone graft materials. This project was designed to rapidly assess and compare promising biodegradable osteoconductive scaffolds for use in the systematic development of new bone regeneration methodologies that combine scaffolds, sources of osteogenic cells, and bioactive scaffold modifications. Promising biomaterials and scaffold fabrication methods were identified in laboratories at Rutgers, MIT, Integra Life Sciences, and Mayo Clinic. Scaffolds were fabricated from various materials, including poly(L-lactide-co-glycolide) (PLGA), poly(L-lactide-co-ɛ-caprolactone) (PLCL), tyrosine-derived polycarbonate (TyrPC), and poly(propylene fumarate) (PPF). Highly porous three-dimensional (3D) scaffolds were fabricated by 3D printing, laser stereolithography, or solvent casting followed by porogen leaching. The canine femoral multi-defect model was used to systematically compare scaffold performance and enable selection of the most promising substrate(s) on which to add cell sourcing options and bioactive surface modifications. Mineralized cancellous allograft (MCA) was used to provide a comparative reference to the current clinical standard for osteoconductive scaffolds. Percent bone volume within the defect was assessed 4 weeks after implantation using both MicroCT and limited histomorphometry. Bone formed at the periphery of all scaffolds with varying levels of radial ingrowth. MCA produced a rapid and advanced stage of bone formation and remodeling throughout the defect in 4 weeks, greatly exceeding the performance of all polymer scaffolds. Two scaffold constructs, TyrPC[subscript PL]/TCP and PPF4[subscript SLA]/HA[subscript PLGA Dip], proved to be significantly better than alternative PLGA and PLCL scaffolds, justifying further development. MCA remains the current standard for osteoconductive scaffolds.United States. Army Medical Research and Materiel Command (Armed Forces Institute of Regenerative Medicine)United States. Office of Naval ResearchUnited States. Air Force. Office of the Surgeon GeneralUnited States. NavyNational Institutes of Health (U.S.)United States. Veterans AdministrationCleveland Clinic Foundatio

Connecting the dots to build the future teaching and learning

This paper outlines a seven-point strategy to devise a system of continuous improvement of teacher quality and, through it, the quality of education as a whole. Education is one of the single most important initiatives that can be undertaken to improve the quality of life, financial security and economic potential of a given population. There is no disputing the benefits of a strong education system. The challenge is in the design and implementation of such a system, and creating the political will to see the system through. For such a program to be implemented, teacher quality and the quality of education as a whole must be considered a national priority. Educational and political leaders must support these initiatives publicly, place them on their policy agenda and establish a blue ribbon commission to develop a strategy to significantly and measurably improve teacher quality. The blue ribbon commission will audit the various policies and programs that influence teacher quality. By mapping these programs and their coherence, the commission will identify opportunities to increase their effectiveness and yield greater and more synergistic harmonious results. These changes can form the basis for a strategy that is sequenced and calibrated to deal with specific entry points, concerns and constraints for the region in question. The steps necessary to promote teacher professionalism may differ where there are serious shortages of teacher candidates or where chronic absenteeism is rampant, or where there is a dearth or glut of technology and infrastructure. This determination will also highlight what role the private sector or civil society can play in the education development in the region. Making teaching an attractive profession is crucial to the strategy, to ensure a constant flow of qualified applicants who can capitalize on their initial training, and take full advantage of continuous learning throughout their careers. Clear career trajectories and incentives tied to performance, as well as a system to accurately measure performance outcomes will provide a pathway to teacher professionalism. The quest for professionalism must begin at the institutions charged with teacher preparation. The blue ribbon commission should include incentives and support for these institutions, providing the support necessary to review and improve their programs to ensure the best results. Innovating the preparation of teachers is integral to the strategy. Rapidly changing societies require versatile teachers to equip their students with a dynamic array of tools to face a dynamic world. Teacher professional development must take into account this need, ensuring that the pre-service education programs align with professional standards, are goal-oriented, and include holistic, integrated and innovative projects. Technology and collaborative projects will also serve a crucial role in the pre-service education of teacher candidates, as well as the life-long development of teachers. The core of good education is a skilled and versatile teaching staff. In order to effect significant improvements to the quality of education, a cohesive strategy is required so that we can combine what we know already into an efficient system which can be implemented worldwide at the scale necessary to succeed. The dots need to be connected. Connecting the dots to build the future teaching and learning (PDF Download Available). Available from: https://www.researchgate.net/publication/314878979_Connecting_the_dots_to_build_the_future_teaching_and_learning [accessed Jan 29 2018]

Regulating mobility in the Peruvian Andes: road safety, social hierarchies and governmentality in Cusco's rural provinces

Significant developments in road safety regulation have taken place in Peru during recent years, reflecting international efforts to reduce worldwide fatalities and injuries. A series of measures has sought to bring about transformations in governmentality among passengers on public transport. Seen ethnographically, these have had uneven success on the ground. In rural provinces of Cusco, situated histories and sociologies of mobility have sometimes led to ambivalence, unobtrusive resistance or reinforcement of discriminatory attitudes. This article explores how reception of the regulations has been refracted through class, ethnic and geographical divisions within Peruvian society, and argues for both the applied and theoretical utility of anthropological study of road safety governance

We are more than EFL teachers-we are Educators: Emancipating EFL student-teachers through photovoice

The prevailing pedagogical orientations of English as a foreign language (EFL) education in Spain oppress learners intellectually in ways that are counterproductive to their learning. As a reaction to this, 129 EFL student-teachers (STs) took part during the 2013/14, 2014/15, and 2015/16 academic years in a workshop which drew on the methodology of participatory action research and on photovoice as a data-creating strategy, in order to emancipate these STs intellectually, boost their EFL development, and offer an alternative critical model for their future EFL teaching. The research was assessed collectively through a variety of qualitative strategies. Results showed that the photovoice workshop created a rich and meaningful context for EFL learning, one which enabled the STs to fully actualize their intellectual potential by producing knowledge collectively, thereby setting a memorable educational example for their own future teaching

Characterization of ‘Wonderful’ pomegranate in the state of Chihuahua, México

The consumption of fruits rich in antioxidants has increased in recent years, a clear example of this is the pomegranate (Punica granatum L.). The cultivation of the pomegranate shows great expectations due to its profitability and its adaptability to development in arid zones. In this research, ‘Wonderful’ pomegranate fruits from Coyame Chihuahua, México were used. Quality parameters and bioactive compounds were evaluated to characterize the pomegranate produced in the state of Chihuahua, six different lots from local producers were used. The results showed significance between the different treatments, lot 5 (L5) presented the best quality characteristics such as: weight, diameter, lower percentage of shell and cartilage, as well as one of the highest percentages of arils, in addition, it had a high Total Soluble Solids (TSS) content, a high Titratable Acidity (TA) and a low sugar-acidity ratio, however, lot 3 (L3) showed the highest antioxidant capacity. In general, the qualities and attributes of the Chihuahua pomegranates, obtained higher values ​​in most of the evaluated variables in comparison with other reported results. On the other hand, as a result of this research, the implementation of the color index in the peel is proposed as a tool for the prediction of the maturity index of the pomegranate. This study contributes to the producers of this fruit tree because there is little information on the production and characterization of the pomegranate

Diseño y construcción de un liofilizador para el secado de la remolacha azucarera (Beta vulgaris var. saccharifera)

Investigación con el fin de secado de laremolacha se empleó procesos físicos y químicos; los métodos utilizados fueron el método inductivo donde se recolecto la remolacha de los diferentes mercados de la ciudad. Y el método deductivo partiendo de fundamentos y cálculos para el diseño, construcción y validación del equipo. Se realizó una simulación del proceso de secado, misma que fue realizada en un secador de bandejas en el laboratorio anteriormente mencionado, donde se obtuvieron los valores que sirvieron de referencia para el diseño y construcción del Liofilizador.El equipo diseñado y construido consta de materiales resistentes a las condiciones que requiere para su funcionamiento: acero inoxidable AISI 304 Y 316 cortadas y soldadas según el diseño, un cuerpo cilíndrico con un cierre hermético de 49 cm de largo, de diámetro externo de 38,5 cm, diámetro interno de 29,5 cm, en su interior posee 3 bandejas perforadas, una bandeja pequeña de 643 cm2 y dos bandejas grandes de 1026 cm2, un manto eléctrico que permite el intercambio de calor de 1100 watts y 110 voltios, para obtener el vacío óptimo se emplea un motor de 110 voltios para poner en funcionamiento un termostato y la bomba de vacío de hp y 110 voltios. El equipo posee los respectivos indicadores de presión y temperatura. El Liofilizador opera a una temperatura de 600C, una carga de 5 Kg, presión de -0,6 psi, con lo cual, se obtuvo un producto seco con una humedad crítica de 0,6 kg sól seco/kg agua, velocidad de secado constante de 0,038 kg/hm2, velocidad decreciente de 0,057 kg/hm2, tiempo de secado anticrítico de 1,66 h, tiempo de secado poscrítico de 3,07 h. Con lo cual el rendimiento del equipo fue del 89%. Concluimos que nuestro equipo cumple con la función de secar en menor tiempo, manteniendo las propiedades nutricionales del producto a deshidratar

Precarity Amidst ‘Ad-Hoc’ Access to Education for Second Generation of Youth Immigrants in Kudat, Sabah

While migration literature is littered with studies on stateless and undocumented children in Malaysia, there is scant focus on the second generation of stateless and undocumented immigrants who were born in Sabah. What happened to the second generation of IMM13 holders and what kind of life condition they tread since? This paper investigates the situation of children of IMM13 holders who were given access to school before 2003, though remain undocumented, and how they make sense of their lives as young adults. Based on in-depth interviews and observations from a broader study conducted in 2013- 2016, youths aged 20-30 years old from Kudat, on the west coast of Sabah, it is our contention that for the undocumented, temporary or ad-hoc access to education remains a palliative route without social inclusion of immigrants into the mainstream society. Keywords: precarity, migration, second-generation immigrants, Sabah, access to educatio

Salicylic acid and nutrient sprays to improve apple fruit quality

Maturity at harvest is one of the most important properties that determine the final quality of the apple fruit. Appearance, texture, flavour and nutritional value are qualities that consumers evaluate empirically to decide whether to eat the fruit again. Within agricultural practices in and out of the orchard, the relationship between plant nutrition and fruit quality is important, and proper nutrient balance is essential to maintain fruit quality. This research work was carried out on ‘Golden Delicious’ and ‘Red Chief’ apple trees. A 56 factorial arrangement was used, with 5 concentrations and 6 factors, 25 treatments in a Taguchi L25 structure. Improvements were found in parameters for fruit finish and fruit quality. The factors with the greatest positive effect on quality in order of importance were Salicylic Acid (SA) 1.0 mM, Potassium (K) 58.90 mM, Molybdenum (Mo) 0.516 mM, Calcium (Ca) 70.00 mM and Cobalt (Co) 8.248 mM and in order of importance the following variables: TSS/acidity ratio, total soluble solids TSS, antioxidant capacity (AC), total phenols (TF), and titratable acidity (TA) in ‘Golden Delicious’ apple. Considering ‘Red Chief’, the factors Ca 70.00 mM, K 58.79 mM and SA 1.0 mM, with the variables; TA, TSS/acidity ratio, TF, TSS and AC that finally lead to an optimal development of finish and quality in the apple fruit