Synthesis of Ca(OH)2 nanoparticles with the addition of Triton X-100. Protective treatments on natural stones: Preliminary results

Calcium hydroxide is typically used in Cultural Heritage conservation for superficial protective treatments thanks to its conversion into calcium carbonate. Calcium carbonate is, in fact, compatible with many carbonate-based architectonic surfaces, because its characteristics are similar to those of the restored materials. In order to improve calcium hydroxide treatments, Ca(OH)₂ particles with sub-micrometric dimensions (nanolimes), are synthesised by a chemical precipitation process: a sodium hydroxide solution, used as precipitator, is added, drop by drop, to a calcium chloride one. In this paper, a nanometric calcium hydroxide, to be used in stones treatment, is produced adding in the initial solutions a surfactant agent (Triton X-100); the solutions are then mixed together simultaneously, drastically reducing the time needful for preparation. Different contents of surfactant are employed, and the influence on particles dimension and carbonatation process is analysed too. The obtained Ca(OH)₂ nanoparticles are characterized by X-ray diffraction (XRD), transmission electron microscopy (TEM) and electron diffraction (ED). The Ca(OH)₂ nanoparticles are regularly shaped, hexagonally plated and with side dimensions less than 200 nm: in particular, increasing the surfactant content, the particle dimension reaches values until 20 nm. Comparing nanolime suspensions obtained without and with the addition of the surfactant agent, the last ones have comparable, if not better, performances in terms of average particle size and morphology, crystallinity and reactivity. Afterwards, the alcoholic nanolime suspension obtained by using Triton X-100 is applied on some natural stones; in fact, the aim of this section is to compare the obtained results with those achieved using a nanolime synthesised without the surfactant agent. To evaluate the treatment effectiveness in a preliminary way, standard tests are performed and compared with the same tests previously obtained by the nanolime synthesised without the surfactant agent: “Scotch Tape Test” and capillarity test.     

Untangling the mystery of absorptive capacity: A process or a set of success factors?

The absorptive capacity of an organization is its ability to translate the knowledge sourced from outside into commercial benefits. Having gained a certain academic interest, the mechanism of the absorptive capacity phenomenon is still puzzling. This paper provides some limited confirmation of earlier frameworks; however, absorptive capacity is demonstrated to be a set of interrelated success factors rather than a sequential process of knowledge articulation in a company. The new model of absorptive capacity proposed encompasses four dimensions: continuing development, bottom-up innovation, trust-based internal cooperation, and deferred knowledge use. The continuing development facet entails a strong positive impact on organizational performance, while the bottom-up innovation dimension deteriorates it. Trust-based internal cooperation and deferred knowledge use report mixed results.     

Mexican Educators Survey on Anatomical Sciences Education and a Review of World Tendencies

Anatomical sciences curricula have been under constant reform over the years, with many countries having to reduce course hours while trying to preserve laboratory time. In Mexico, schools have historically been autonomous and unregulated, and data regarding structure and methods are still lacking. A national survey was sent by the Mexican Society of Anatomy to 110 anatomical sciences educators. The questionnaire consisted of 50 items (open and multiple choice) for gross anatomy, microscopic anatomy, neuroanatomy, and embryology courses in medical schools across Mexico. A clinical approach was the most common course approach in all disciplines. Contact course hours and laboratory hours were higher in Mexican anatomy education compared to other countries, with the highest reported contact hours for embryology (133.4 ± 44.1) and histology (125 ± 33.2). There were similar contact hours to other countries for gross anatomy (228.5 ± 60.5). Neuroanatomy course hours (43.9 ± 13.1) were less than reported by the United States and similar to Saudi Arabia and higher than the United Kingdom. Dissection and microscopy with histological slides predominate as the most common laboratory activities. Traditional methods prevail in most of the courses in Mexico and only a few educators have implemented innovative and technological tools. Implementation of new methods, approaches, and curricular changes are needed to enhance anatomical sciences education in Mexico.     

On being a non-white academic in physical education and sport pedagogy

Conversation regarding the challenges and pressures that Early Career Academics (ECAs) face in the current context of the neoliberal university sector has begun to grow generally, and in the field of Physical Education and Sport Pedagogy (PESP) in particular. However, the additional challenges faced by non-white PESP academics in their early careers have, as yet, been absent from the ECA conversation. In this paper, I draw upon my own experiences as a non-white, female ECA with English as an additional language (EAL), working in the field of PESP in a developed English-speaking country, to explore racialised discourses and practices in the academia. To do so, I make use of a critical whiteness lens and an autoethnographic approach. In the analysis of the narratives, I invite others to reflect on how race is socially constructed, on the ‘extra effort’ that non-white academics with EAL must expend in order to survive colour-blind academia, and on the limited options for agency among non-white ECAs. The paper concludes with reflections on how academics need to open the dialogue ‘just a bit more’ to include non-white academics in the conversation about ECAs working in neoliberal university contexts to create spaces for equitable work.     

Health and body tensions and expectations for pre-service physical education teachers in Spain

The importance of the Physical Education (PE) teacher’s body, particularly for teaching PE, has been highlighted in literature. PE teachers are expected to be clear role models to students through their acts, behaviours and bodies. However, their strong embodied subjectivities, particularly those related to their teaching practices, may be problematised. This paper explores the ways in which a group of 15 pre-service PE teachers from a Spanish university constructed perspectives about the body and health in relation to their professional practices. Body journals were used to collect data, which were analysed using a Deleuze-Guattarian approach. The findings reveal the significant emphasis participants placed on their own bodies while teaching PE and the pressure they felt to conform to certain expectations of their professional roles. In response, we propose critical reflection on the content of Physical Education Teacher Education (PETE) programmes and incorporation of alternative pedagogical approaches to alleviate the heavy reliance on pre-service teachers’ bodies.     

Acquisition of Mathematical Language: Suggestions and Activities for English Language Learners

In this article, we describe aspects of mathematical language that could be problematic to English-language learners, provide recommendations for teaching English-language learners, and suggest activities intended to foster language development in mathematics.     

Orthographic Neighborhood-Size Effects on the Reading Aloud of Italian Children With and Without Dyslexia

This study examines the effects of orthographic neighborhood size (N-size) in relationship with word frequency on the reading aloud of children with and without dyslexia whose language has a consistent orthography. Participants included 22 Italian fourth-grade children with dyslexia and 44 age-matched typically developing readers. Children with dyslexia read low-frequency words with high N-size faster than words that had no neighbors; by contrast, typically developing readers showed no N-size effects, irrespective of word frequency. The facilitating effect of N-size on low-frequency word reading in children with dyslexia indicates that they benefit from lexical activation spreading from dense neighborhoods.     

Establishing a Baseline: History,Evolution and Evaluation of Grand Valley State University's Off-Campus Library Services

ABSTRACT

The model replacing a dedicated off-campus library services (OCLS) unit was one in which librarians provide services to both on- and off-campus students and faculty within their liaison disciplines. A year after this model was implemented, faculty in subjects taught both on- and off-campus were surveyed to assess their awareness of library resources and whether this awareness impacted course assignment design. Findings from this survey combined with a planned review of off-campus course syllabi will help identify areas of concern and lead to ways to strengthen awareness and usage of library resources.