527 research outputs found
MNT-CURN Seminar Series: Antibody Engineers - Blockchain & Proof of Useful Work
No full textThis video is part of a series from the Micro Nano Technology Education Center's (MNT-EC) Micro Nano Technology Collaborative Undergraduate Research Network (MNT-CURN) Research Program. In this program, students gain hands-on research experience and build nanotechnology technical education skills. Throughout this video series, viewers "... will hear and see nanotechnology and microtechnology professors presenting about their own research and work -- from biosensors to underwater drones to nanomaterials." Each video covers a different specialty that students may want to learn about and pursue as an undergraduate research project.During the presentation, Alejandro Strachan, professor of materials engineering at Purdue University, provides an explanation of blockchain and discusses research aimed at adapting bitcoin mining technology, originally used to solve cryptographic problems for bitcoin, for addressing scientific challenges. Blockchain is the technology underlining Bitcoin and other cryptocurrencies, functioning as a ledger that records bitcoin transactions in the form of blocks. To add another block to the chain, one must solve a cryptographic password, which is done through bitcoin mining. Strachan follows the explanation of blockchain by discussing research related to the usage of this same technology to solve scientific problems, which can help maximize benefits from the energy-intensive process of bitcoin mining.This video runs 32:53 minutes in length. Additional videos from this series are available to view separately
Columbus\u27s Ghost: Tourism, Art and National Identity in the Bahamas
No full textIan Gregory Strachan (1969-), Bahamian writer, Chair of English Studies at College of the Bahamas, author of God\u27s Angry Babies (1997) and Paradise and Plantation (2002)
El fantasma de Colón: El turismo, el arte y la identidad nacional en las Bahamas
No full textIan Gregory Strachan (1969-), Bahamian writer, Chair of English Studies at College of the Bahamas, author of God's Angry Babies (1997) and Paradise and Plantation (2002).
Researching in cross cultural contexts: a socially just process.
No full textIn this paper, we explore culture and its relationship to cross cultural research. The context for this research is Vanuatu, a small South Pacific Island nation. The action research process used was a collaboration between two New Zealand academics, two Ni Vanuatu women researchers and 13 participants over a two year period. The focus of the action research was the design and delivery of a culturally appropriate educational leadership development programme for women. The collaborative research process raised a number of ethical and methodological considerations, for example, the importance of mutually respectful relationships, working in partnership, collaboration, capacity building, transparent communication and consideration of the local context. Using stories from the Vanuatu context, we illustrate how we navigated culture to be able to research in socially just ways. Being involved in socially just, cross cultural research calls for a thoughtful, well-designed and culturally informed approach throughout all stages of the research process, from initial planning through to follow up and capacity building and finally, the sharing of research findings
La colección Enrique Strachan de la Biblioteca de la Universidad Bíblica Latinoamericana y su relación con el Instituto Bíblico (1923-1941)
No full textTesis (licenciatura en bibliotecología y ciencias de la información)--Universidad de Costa Rica. Facultad de Educación. Escuela de Bibliotecología y Ciencias de la Información, 2022Poco después de la muerte de Enrique Strachan en 1945, los libros de su colección personal fueron trasladados a la biblioteca de la Universidad Bíblica Latinoamericana (UBL) e integrados a la colección general. Así permanecieron durante varios años, hasta que el bibliotecólogo a cargo en el período 1982-2017 localizó la mayoría, los separó y los colocó en estantería cerrada, aproximadamente entre los años 2006 y 2016 (A. Pérez, comunicación personal, 2021). Rescató así una colección prácticamente desconocida, convirtiéndola en una colección especial, a la cual denominó Colección Enrique Strachan (CES). Las últimas piezas de esta valiosa colección fueron localizadas recientemente por el actual bibliotecólogo y, con ello, quedó conformada definitivamente en el año 2021. La conformación de dicha colección despertó el interés del investigador por el origen, proceso de formación, función y en general, la historia de la colección. Al situar la pregunta en el origen de la colección destaca el hecho de que el Instituto Bíblico(IB) fue la primera institución a la que perteneció. De forma que al indagar en la historia de la colección se vuelve necesario conocer también la historia del IB. Dicho enfoque permite a esta investigación estudiar la historia de una colección especial en relación con un proyecto educativo concreto. Surge así la pregunta de investigación: ¿Cómo se puede explicar la relación de la Colección Enrique Strachan con el proyecto educativo del Instituto Bíblico? Esta pregunta se despliega en tres elementos de análisis. El primero corresponde a los motivos que llevaron a Enrique Strachan a formar esta colección bibliográfica. El segundo a la CES misma como objeto de investigación y a la vez fuente de información. El tercero se trata de la congruencia entre la colección, su contenido y propósito, con el proyecto educativo del Instituto Bíblico. La metodología utilizada consistió...UCR::Docencia::Ciencias Sociales::Facultad de Educación::Escuela de Bibliotecología y Ciencias de la Informació
Geology of the Strachan Creek area, British Columbia
No full textThe Strachan Creek area is on the east shore of Howe Sound about three miles north of the town of Horseshoe Bay, B.C. The rocks of the area consist of migmatite of the Bowen Island group, volcanic rocks of the Gambier group, plutonic rocks of the Coast Intrusions, and late basic and acidic dykes. These rocks are described and their relationships discussed,
A striking feature of the Strachan Creek area is the banding in the diorite, one of the units of the Coast Intrusions. Each complete band is a couplet composed of one light- and one dark-coloured layer, one layer grading into the other. The light-coloured layer is composed mostly of plagioclase, whereas the dark-coloured layer is composed mostly of hornblende and magnetite. Generally, the ratio of hornblende (plus magnetite) to plagioclase decreases downward from a sharp contact, the couplets thus resembling inverted "graded-bedding". The author tentatively concludes that the banding in the diorite originated by a process of differentiation and crystal rising within a cooling diorite magma.Science, Faculty ofEarth, Ocean and Atmospheric Sciences, Department ofGraduat
Molecular dynamics characterization of the contact between clean metallic surfaces with nanoscale asperities
No full textWe use molecular dynamics (MD) simulations to characterize the tensile strength of contacts formed between various clean platinum surfaces with nanoscale asperities. Both commensurate contacts between (001) and (111) surfaces and incommensurate (001) ones are considered over a wide range of asperity sizes. In cyclic closing and opening, fresh asperities that form contacts for the first time show significant plastic deformation; this leads to a reduction in the effective contact area during the first few cycles, after which steady state is achieved both in terms of contact size and the pull-out force necessary to open the contacts. As is the case for commensurate surfaces [H. Kim and A. Strachan, Phys. Rev. Lett. 104, 215504 (2010)], the strength of the metallic bridges that form in incommensurate contacts exhibit strong size effects; their strength increases with decreasing size until a length of similar to 5 nm, below which weakening is observed. Commensurate contacts lead to stronger bridges than incommensurate ones but only during the initial closing events; after steady state is achieved, commensurate and incommensurate (001) surfaces lead to bridges of similar strengths
'n Intertekstuele studie : Die werfbobbejaan van Alexander Strachan
No full textThe title, "'n Intertekstuele studie: Die werfbobbejaan van Alexander Strachan", refers to an analysis of the way in which intertextual processes generate meaning in this text. It is analysed with specific regard to the way in which it enters into signifying and detennining relationships with other texts, notably texts by the same author. A significant part of the intertexts that are reassembled, refined, restated, amplified, contradicted or diffused throughout Die werfbobbejaan are located in other works in the Strachan oeuvre: n Wereld sonder grense (1984) and Die jakkalsjagter (1990). These three texts are related as a triptych of intertextual association, and the boundaries between them are not hermetically sealed. Intertextual activity in Die werfbobbejaan involves an intricate network of interfigural relationships. The identities of numerous characters in the text start to coincide with those of other characters to which they are linked intertextually. Characters travel across the boundaries supposedly separating "different" texts. The doubling and displacing of characters alert us to the fact that the text is not fixed within stable boundaries. Codes, scenes, snippets of dialogue and even moods also penetrate the boundaries between "different" texts and recur in the form of mirror images or ghostly transformations of themselves. These intertextual patterns mobilise an active reading process and unify the act of reading with that of writing in "a single signifying process" (Barthes 1979: 79). The narrator in Die werfbobbejaan is a woman writing a biography about an author. Reading his novels and unpublished manuscript she finds that the manuscript of her subject anticipates and later even dictates "extra-textual" reality and inserts her into the fiction. The way in which the biography is taken up in the play of intertextuality leads to the perception that the fictional author is an intertextual mirror image of the real author, who belongs to the extra-textual world outside the book. In this way intertextual activity in Die werfbobbejaan destabilizes the frame between fiction and reality. No reading of Die werfbobbejaan can be complete without taking into account the plurality of simultaneously perceived meanings triggered by intertextual activity in the text
Molecular dynamics predictions of thermal and mechanical properties of thermoset polymer EPON862/DETDA
No full textWe use molecular dynamics (MD) to perform an extensive characterization of the thermo-mechanical response of a thermoset polymer composed of epoxy EPON862 and curing agent DETDA. Our simulations, with no adjustable parameters, show that atomistic simulation can capture non-trivial behavior of amorphous thermosets including the role of polymerization degree, thermal history, strain rate and temperature on the glass transition temperature (T(g)) and mechanical response (including ultimate properties) and lead to predictions in quantitative agreement with experiments. We find a significant increase in T(g), Young\u27s modulus and yield stress with degree of polymerization while yield strain is significantly less sensitive to it. For structures cured beyond the gel point (percolation of a 3D network) conversion degree and temperature affect yield stress in a similar way with yield stress linearly dependent on T T(g): however, we find non-linear and non-universal relationship below the gel point. Our results show that a relative small variation in polymerization degree (similar to 5%) can explain the spread in experimental measurements of T(g) and elastic constants available in the literature. (c) 2011 Elsevier Ltd. All rights reserved
Coarse grain modeling of spall failure in molecular crystals: role of intra-molecular degrees of freedom
No full textWe use a recently developed thermodynamically accurate mesodynamical method (Strachan and Holian 2005 Phys. Rev. Lett. 94 014301) where groups of atoms are represented by mesoparticles to characterize the shock compression and dynamical failure (spall) of a model molecular crystal. We characterize how the temperature rise caused by the shockwave depends on the specific heat of the degrees of freedom (DoFs) internal to the mesoparticles (C-int) and the strength of the coupling between the internal DoFs and the mesoparticles. We find that the temperature of the shocked material decreases with increasing C-int and decreasing coupling and quantify these effects. Our simulations also show that the threshold for plastic deformation (the Hugoniot elastic limit) depends on the properties of the internal DoFs while the threshold for failure is very insensitive to them. These results have implications on the results of all-atom MD simulations, whose classical nature leads to a significant overestimation of the specific heat of molecular materials
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