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Crystal structures, microtopography, morphologies, elemental compositions, and ionic conductivity have been investigated for Li5-xLa3(Nb,Ta)O12-y using X-ray diffraction (XRD), field-emission analytical scanning and transmission electron microscopies (S/TEM), and electrochemical impedance spectroscopy. Using Rietveld refinements with powder XRD patterns, we determined that the number of Li atoms in the formula is less than 5 and that Li5-xLa3(NbTa)O12-y crystallizes in the cubic garnet structure with a space group Ia-3d. Sintering at varying temperatures (750–1000 °C) for 5 h in an ambient atmosphere produced distinct outcomes. Rietveld refinements disclosed that the sample sintered at 1000 °C (Li3.43(2)La3Nb1.07(2)Ta0.93(2)O12-y, a = 12.8361(7) Å, V = 2114.96(3) Å3) exhibited the highest ionic conductivity, while the 850 °C sample had the lowest conductivity, characterized by lower Li concentration and impurity phases (Li(Nb,Ta)3O88, Li2CO3). Analyses, including XRD and electron microscopy, confirmed the 1000 °C sample as a relatively phase pure with enhanced Li content (Li/La = 1.2), larger grains (15 μm), and uniform crystallinity. The 1000 °C sample introduced additional partially filled Li3 (96h) sites, promoting Li migration, and enhancing ionic conductivity. The resulting XRD pattern at 1000 °C has been submitted to the Powder Diffraction File as a reference.
This chapter presents the patterns of composition in Slavic languages. In Slavic, most compounds are nouns (like čel-o-věkъ) and adjectives (like *bos-o-nògъ). Verbal compounds (like blag-o-sloviti ‘to bless’) are less frequent and less productive (as is generally the case in Indo-European languages). The author reviews patterns and phenomena of nominal, adjectival, adverbial, verbal, pronominal, and numeral composition.
The U.S. federal government annually awards billions of dollars as contracts to procure different products and services from external businesses. Although the federal government’s immense purchasing power provides a unique opportunity to invest in the nation’s women-owned businesses (WOBs) and minority-owned businesses (MOBs) and advance the entrepreneurial dreams of many more Americans, gender and racial disparities in federal procurement are pervasive. In this study, we undertake a granular examination of these disparities by analyzing the data on 1,551,610 contracts awarded by 58 different federal government agencies. Specifically, we examine the representation of WOBs and MOBs in contracts with varying levels of STEM intensity and across 19 different contract categories, which capture the wide array of products and services purchased by the federal government. We show that contracts with higher levels of STEM intensity are associated with a lower likelihood of being awarded to WOBs and MOBs. Interestingly, the negative association between a contract’s STEM intensity and its likelihood to be awarded to MOBs is particularly salient for Black-, and Hispanic-owned businesses. Among the 19 categories of contracts, Black-owned businesses are more likely to receive contracts that are characterized by lower median pay levels. Collectively, these results provide data-driven evidence demonstrating the need to make a distinction between the different categories of MOBs and consider the type of products and services being procured while carrying out an examination of racial disparities in federal procurement.
Chapter 11 focuses on EC STEM education. It describes what STEM looks like in EC settings and identifies ways in which STEM elements can be incorporated into children’s learning. The chapter describes how STEM-related play can enhance young children’s appreciation of the world and provides a range of examples that have potential for STEM learning. Digital tools and applications for STEM learning are featured in this chapter.
Welcome to the fifth edition of Science in Early Childhood. Who would have thought we would have come so far since the inception and publication of this book back in 2012? Or that science education in early childhood (EC) would have moved forward so much? This new edition retains the essential elements of science learning and teaching that inform and guide pre-service teachers and EC professionals, while addressing the latest version (Version 2) of Belonging, Being and Becoming: The Early Years Learning Framework for Australia (EYLF) (AGDE, 2022) and Version 9 of the Australian Curriculum: Science (ACARA, 2023). Recognising the importance of shared knowledge, we have some new co-authors to bring fresh ideas and to mentor through the process of writing chapters.
In this chapter, the authors write about science, technology, engineering and mathematics (STEM) education and its relationship with ECEfS. They argue that these fields are connected through their common, underpinning inquiry-based approaches to learning and teaching. They illustrate these connections through two stories from the field. They take these connections even further, however, and show how STEM and ECEfS can be enriched by adding an ‘A’ into STEM, to become STEAM. The ‘A’ stands for the ‘arts’, which can broadly include the humanities and social sciences. By expanding STEM into STEAM, richer, fuller learning experiences can be generated that offer stronger interdisciplinary connections to the ways in which the world really works, where empathy, creativity and curiosity are fostered and given multiple opportunities to be expressed. They show how a STEAM approach focusing on the creative arts can be used to reflect on artworks, for example, and how it can enrich a study of frogs and frog habitats. The authors also introduce a practical guide to assist early childhood educators to choose appropriate pedagogies when using inquiry-based learning. This is the IKOPE planning model – interest, knowledge, organisation, practice, empower – a series of iterative steps that build on children’s interests, supporting the creativity, problem-solving and communication of their STEAM learning.
Polytypism is common in micas, and the frequency of polytype occurrence is believed to be related closely to the crystallization conditions and chemical compositions of the corresponding fluids and melts. Coexisting multiple standard and complex/disordered polytypes in igneous rocks generally reflect a complicated magma evolution history. The purpose of the current study was to clarify the origin of coexisting biotite polytypes and their growth mechanism. Micro-X-ray diffraction (μXRD) and transmission electron microscopy (TEM) were used to investigate Fe-rich biotite phenocrysts in rhyolite from the Long Valley Caldera, California, USA. The μXRD analyses characterized various polytypes, and TEM observations revealed that common polytypes (e.g. 1M, 2M1, and 3T) and rare polytypes (e.g. 4M2 and 4A8) coexist within biotite monocrystals. The two 4-layer polytypes of Fe-rich biotite, 4M2 and 4A8, were identified via selected-area electron diffraction (SAED) and high-resolution scanning transmission electron microscopy (HRSTEM) at the atomic resolution, with unique stacking sequences ([0222] for 4M2 and [002] for 4A8). Energy-dispersive X-ray spectroscopy (EDS) results showed differences in their chemical compositions, especially Fe and K. The 4A8 polytype is reported for the first time. The present study suggested that environmental changes, such as rapid cooling and inhomogeneous compositional distribution, led to chemical and structural oscillations and complex nucleation of the two 4-layer polytypes. Screw dislocations producing spiral growth enhance polytype stability and form ordered long-period/complex polytypes. These results are useful to understand the origin of long-period/complex polytypes and the intergrowths of diverse polytypes formed in non-equilibrium crystallization environments.
This chapter considers some practical applications of STEM in the primary classroom with a particular emphasis on STEM’s relationship to mathematics outcomes and the integrity of the mathematics as taught in the STEM context. This will extend to an exploration of Education for Sustainability (EfS) in the primary mathematics classroom, and opportunities for STEM tasks that are based on inquiry within the EfS space.
Abstract: Cultivating custodians of democracy requires a deep understanding of the environmental and cultural forces that impel change, as well as the skills to respond to unexpected events in ways that promote inclusive participation. While civics, history, and social studies have traditionally been assigned the task of citizenship education, I will argue that if democracy is to flourish, the education of the new patriot will require the reconstruction of the STEM and expressive (aesthetic) curricula as well. The aim is to create a body of citizens who are committed to maintaining a democratic culture, who are open to change, and can reassess their individual and collective responses to it. Thus, Educating for Democracy holds that today democracy requires a new form of patriotism, one where loyalty and commitment are informed by disciplined inquiry and broad participation. The book shows how different subject areas can contribute to this aim.
In our world of unceasing turmoil, an educated citizenry is the first and strongest line of defence for democratic renewal. Educating for Democracy shows how students can prepare for the responsibilities of 'the most important office in a democracy' – that of a citizen. Education can provide students with the dispositions and skills needed to exercise their role judiciously and responsibly, as a patriot who cares about democracy and as a custodian who cares for democracy. These two aspects of caring call for curriculum-wide reform. The outcome of this reform is a patriot who serves as custodian of democratic culture, where commitment and competence, heart and mind, love and intellect, are brought together for the sake of democratic renewal. While nations, as both instruments and proximal objects of care, have an important role to play in this renewal, the ultimate aim is the care and cultivation of a democratic culture.
This chapter considers Swift’s scepticism of the written and printed word from the perspective of his fear of Dissenting Protestant scriptural exegesis and the putative transparency of print culture. Sola scriptura is the Protestant doctrine, embraced most by evangelical Christians like the Dissenters, that texts alone convey meaning without interpretation (what we call ‘textualism’ in legal interpretation and literary criticism). This essay examines his close personal and intellectual relationship with the Catholic poet Alexander Pope, who was also of the Church most sceptical of sola scriptura, and their joint attack with the rest of the Scriblerus Club against the Whig ideology of textualism and the cult of scientific empiricism (often referred to by critics as ‘naïve empiricism’). This chapter offers both a historical and contemporary perspective on literature and technology, examining Swift’s doubts concerning the printing press as the new information technology of the time and extending this vein of criticism to new digital humanities platforms for Swift’s texts.
Accurately determining local polarization at atomic resolution can unveil the mechanisms by which static and dynamical behaviors of the polarization occur, including domain wall motion, defect interaction, and switching mechanisms, advancing us toward the better control of polarized states in materials. In this work, we explore the potential of atomic-resolution scanning transmission electron microscopy to measure the projected local polarization at the unit cell length scale. ZnO and PbMg1/3Nb2/3O3 are selected as case studies, to identify microscope parameters that can significantly affect the accuracy of the measured projected polarization vector. Different STEM imaging modalities are used to determine the location of the atomic columns, which, when combined with the Born effective charges, allows for the calculation of local polarization. Our results indicate that differentiated differential phase contrast (dDPC) imaging enhances the accuracy of measuring local polarization relative to other imaging modalities, such as annular bright-field or integrated-DPC imaging. For instance, under certain experimental conditions, the projected spontaneous polarization for ZnO can be calculated with 1.4% error from the theoretical value. Furthermore, we quantify the influence of sample thickness, probe defocus, and crystal mis-tilt on the relative errors of the calculated polarization.
In this chapter, we briefly discuss the higher education system in Israel, its various types, and the settings of undergraduate studies at its universities. We then explain why we focus on universities with strong emphasis on science, technology, engineering, and mathematics (STEM) teaching and learning of undergraduate students. Finally, we explore several large-scale undergraduate research studies conducted at the Technion, the Israel Institute of Technology.
The first part of the chapter provides an overview of assessment as an integral element of undergraduate research’s continued success and sustainability. Building from this introduction, the remainder of the chapter explains the EvaluateUR method, a proven approach to assessing the skills and competencies of undergraduate research students and for improving student learning. The EvaluateUR method documents student growth in academic and workplace-related knowledge and skills and fosters meaningful student–mentor dialog to strengthen students’ awareness of their academic strengths and weaknesses. The chapter includes a summary of the findings from an independent evaluation of the method and concludes with remarks about how the method is being adapted to support the assessment of course-based undergraduate research experiences and students competing in remotely operated underwater vehicle competitions.
Part III comprises views on undergraduate research in a broad disciplinary variety of disciplines. The section is structured within five subject clusters and a list of disciplines that do not match with the clustering. In general, we find examples of undergraduate research in any discipline. In some cases, as in psychology, undergraduate research had always been a (potential) component of the undergraduate curriculum. Therefore, undergraduate research doesn’t look new. In contrast, some university teachers, for instance in mathematics or law, are convinced that their discipline is too complicated to allow for undergraduate research. In the context of our handbook, by far the most common approach to undergraduate research is: just do research. When it comes to the implementation of undergraduate research, best practice arises with pioneering initiatives of engaged teachers or students and often results in organizational solutions, as in changed curricula, new research facilities, or a rethinking of research-based student–staff relationships.
Many universities, commercial companies, and science organizations who use microscopy have outreach programs. The members of such generally love to share their enthusiasm and passion with the next generation. Content and confidence on providing such a program often comes from sharing ideas with like-minded scientists. These programs are typically delegated with the acronym STEM or STEAM: science, technology, engineering, art, and math. One of MSA's outreach programs is ProjectMICRO. Included are some STEAM ideas to share.
This paper is set against the backdrop of a rapidly changing world that brings considerable challenges and possibility for UK higher education. While the world of work is transitioning to Industrial Digitalisation (I4.0) technologies, the widespread lack of relevant skills among academics in a number of non-STEM disciplines is a fundamental impediment to harnessing the power of I4.0 in learning and teaching. Furthermore, there is no clear direction for how to start the process of curriculum innovation. To guide academics in non-STEM subjects, a three-step heuristic model for embedding core digitalisation competencies in the non-STEM curriculum is introduced. This chapter - as well as seeking to bring curricular change by empowering academics to make the first steps in embedding disciplinary relevant digitalisation competencies – intends to stimulate discussion about how universities can best produce graduates with the skillset and mind-set to critique, understand and find spaces to thrive in digitalisation-informed workplaces.
In recent years, atomic resolution imaging of two-dimensional (2D) materials using scanning transmission electron microscopy (STEM) has become routine. Individual dopant atoms in 2D materials can be located and identified using their contrast in annular dark-field (ADF) STEM. However, in order to understand the effect of these dopant atoms on the host material, there is now the need to locate and quantify them on a larger scale. In this work, we analyze STEM images of MoS2 monolayers that have been ion-implanted with chromium at ultra-low energies. We use functions from the open-source TEMUL Toolkit to create and refine an atomic model of an experimental image based on the positions and intensities of the atomic columns in the image. We then use the refined model to determine the likely composition of each atomic site. Surface contamination stemming from the sample preparation of 2D materials can prevent accurate quantitative identification of individual atoms. We disregard atomic sites from regions of the image with hydrocarbon surface contamination to demonstrate that images acquired using contaminated samples can give significant atom statistics from their clean regions, and can be used to calculate the retention rate of the implanted ions within the host lattice. We find that some of the implanted chromium ions have been successfully integrated into the MoS2 lattice, with 4.1% of molybdenum atoms in the transition metal sublattice replaced with chromium.
Researchers on the vocabulary growth of native speakers of English, usually distinguish three main ways in which a learner’s vocabulary increases – through being taught or deliberately learning new words, through learning new words by meeting them in context, and through recognising and building new words by gaining control of the prefixes and suffixes and other word building devices. In this chapter we look at the extent to which word building affects vocabulary size, the psychological reality of the relationship between inflected and derived words and their stem form, and the teaching and learning options for gaining control of English word-building processes. There are two related but distinguishable reasons for focusing on word parts. First, prefixes and stems can work as mnemonic devices to help learners remember new words by relating them to the meanings of the known parts that they contain. Second, knowledge of prefixes and suffixes can help learners see the relationship between word family members where one or more of the members is already known. The chapter contains lists of useful word parts and describes a strategy for using word parts to help remember words.
In this study, binary as-cast Al–Cu alloys: Al25Cu (Al–25%Cu) and Al45Cu (Al–45%Cu) (in wt%) were severely plastically deformed by extrusion combined with a reversible torsion (KoBo) method to produce an ultrafine-grained structure (UFG). The binary Al–Cu alloys consist of α-Al and intermetallic Al2Cu phases. The morphology and volume fraction of α-Al and Al2Cu phases depend on the Cu content. The KoBo process was carried out using extrusion ratios of λ = 30 and λ = 98. The effect of phase refinement has been studied by means of scanning electron microscopy with electron backscattering diffraction and scanning transmission electron microscopy. The mechanical properties were assessed using compression tests. Detailed microstructural analysis shows that after the KoBo process, a large number fraction of high-angle boundaries (HABs) and a very fine grain structure (~2–4 μm) in both phases are created. An increase of λ ratio during the KoBo processing leads to a decrease in average grain size of α-Al and Al2Cu phases and an increase in fraction of HABs. UFG microstructure and high fraction of HABs provide the grain boundary sliding mechanism during KoBo deformation. UFG microstructure contributes to the enhanced mechanical properties. Compressive strength (Rc) of Al25Cu alloy increases from 172 to 340 MPa with an increase of λ. Compressive strain (Sc) for Al25Cu alloy increased from 35 to 67% with an increase of λ. High fraction of intermetallic phase in Al45Cu alloy was responsible for room temperature strengthening of alloy and low compressive strain. The deformed Al45Cu alloy with λ = 30 showed that Rc is 194 MPa and Sc is equal to 10%.