Research

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  • A Latin-American Parents' Group Participates in their Children's Schooling: Parent Involvement Reconsidered
    A Latin-American Parents' Group Participates in their Children's Schooling: Parent Involvement Reconsidered
    Online version of an article originally published as: Bernhard, J. K., Freire, M., Pacini-Ketchabaw, V. & Villanueva, V. (1998). A Latin American parents' group participates in their children's schooling: Parent involvement reconsidered. Canadian Ethnic Studies Journal 30(3):77-98.
    A Logic For Decidable Reasoning About Actions
    A Logic For Decidable Reasoning About Actions
    We consider a modified version of the situation calculus built using a two-variable fragment of the first-order logic extended with counting quantifiers. We mention several additional groups of axioms that can be introduced to capture taxonomic reasoning. We show that the regression operator in this framework can be defined similarly to regression in Reiter’s version of the situation calculus. Using this new regression operator, we show that the projection and executability problems (the important reasoning tasks in the situation calculus) are decidable in the modified version even if an initial knowledge base is incomplete. We also discuss the complexity of solving the projection problem in this modified language in general. Furthermore, we define description logic based sub-languages of our modified situation calculus. They are based on the description logics ALCO(U) (or ALCQO(U), respectively). We show that in these sub-languages solving the projection problem has better computational complexity than in the general modified situation calculus. We mention possible applications to formalization of Semantic Web services and some connections with reasoning about actions based on description logics.
    A Logic of Actions Revisited
    A Logic of Actions Revisited
    We propose a theory for reasoning about actions based on order-sorted predicate logic where one can consider an elaborate taxonomy of objects. We are interested in the projection problem: whether a statement is true after executing a sequence of actions. To solve it we design a regression operator that takes advantage of well-sorted unification between terms. We show that answering projection queries in our logical theories is sound and complete with respect to that of in Reiter’s basic action theories. Moreover, we demonstrate that our regression operator based on order-sorted logic can provide significant computational advantages in comparison to Reiter’s regression operator.
    A Matter of Choice : a Critical Discourse Analysis of ECEC Policy in Canada's 2006 Federal Election
    A Matter of Choice : a Critical Discourse Analysis of ECEC Policy in Canada's 2006 Federal Election
    This paper used a Critical Discourse Analysis (CDA) to analyze the representation of Early Childhood Education and Care (ECEC) in the 2006 federal election in Canada. Using Fairclough's approach to CDA, the study analyzed written documents including newspaper articles from The Globe and Mail and The National Post, the policy platforms of the Liberal and conservative parties, and political speeches from party leaders. The "choice" discourse was found to be dominant in the majority of texts examined. A dominant discourse is one that is created and sustained by those with power thus contributing to hegemony in society. Three textual and discourse processes were found to legitimize the "choice" discourse and contribute to its dominance: rationalization, nominalization and conversationalization. It is suggested that the language used in public documents throughout this election and the subsequent dominance of the "choice" discourse may have had a significant impact on citizens' understanding and appreciation of the complexities of the ECEC issue., Richardson, B., & University of Toronto. Childcare Resource and Research Unit. (2011). A matter of choice: A critical discourse analysis of ECEC policy in canada's 2006 federal election Childcare Resource and Research Unit.
    A Method for Design of Modular Reconfigurable Machine Tools
    A Method for Design of Modular Reconfigurable Machine Tools
    Presented in this paper is a method for the design of modular reconfigurable machine tools (MRMTs). An MRMT is capable of using a minimal number of modules through reconfiguration to perform the required machining tasks for a family of parts. The proposed method consists of three steps: module identification, module determination, and layout synthesis. In the first step, the module components are collected from a family of general-purpose machines to establish a module library. In the second step, for a given family of parts to be machined, a set of needed modules are selected from the module library to construct a desired reconfigurable machine tool. In the third step, a final machine layout is decided though evaluation by considering a number of performance indices. Based on this method, a software package has been developed that can design an MRMT for a given part family., Xu, Z., Xi, F., Liu, L., & Chen, L. (2017). A method for design of modular reconfigurable machine tools. Machines, 5(1), 5., This article belongs to the Special Issue Robotic Machine Tools.
    A New Look at Retest Learning in Older Adults: Learning in the Absence of Item-Specific Effects
    A New Look at Retest Learning in Older Adults: Learning in the Absence of Item-Specific Effects
    We investigated retest learning (i.e., performance improvement through retest practice) in the absence of item- specific effects (i.e., learning through memorizing or becoming familiar with specific items) with older adults. Thirty-one older adults (ages 60–82 years, M = 71.10, SD = 6.27) participated in an eight-session self-guided retest program. To eliminate item-specific effects, parallel versions of representative psychometric measures for Induc- tive Reasoning, Perceptual Speed, and Visual Attention were developed and administered across retest sessions. The results showed substantial non-item-specific retest learning, even controlling for anxiety, suggesting that re- test learning in older adults can occur at a more conceptual level.
    A Novel Glass Polyalkenoate Cement for Fixation and Stabilisation of the Ribcage, Post Sternotomy Surgery: An ex-Vivo Study
    A Novel Glass Polyalkenoate Cement for Fixation and Stabilisation of the Ribcage, Post Sternotomy Surgery: An ex-Vivo Study
    This study investigates the use of gallium (Ga) based glass polyalkenoate cements (GPCs) as a possible alternative adhesive in sternal fixation, post sternotomy surgery. The glass series consists of a Control (CaO–ZnO–SiO2), and LGa-1 and LGa-2 which contain Ga at the expense of zinc (Zn) in 0.08 mol% increments. The additions of Ga resulted in increased working time (75 s to 137 s) and setting time (113 to 254 s). Fourier Transform Infrared (FTIR) analysis indicated that this was a direct result of increased unreacted poly(acrylic acid) (PAA) and the reduction of crosslink formation during cement maturation. LGa samples (0.16 wt % Ga) resulted in an altered ion release profile, particularly for 30 days analysis, with maximum Ca2+, Zn2+, Si4+ and Ga3+ ions released into the distilled water. The additions of Ga resulted in increased roughness and decreased contact angles during cement maturation. The presence of Ga has a positive effect on the compressive strength of the samples with strengths increasing over 10 MPa at 7 days analysis compared to the 1 day results. The additions of Ga had relatively no effect on the flexural strength. Tensile testing of bovine sterna proved that the LGa samples (0.16 wt % Ga) are comparable to the Control samples., Alhalawani, A. M. F., Curran, D. J., Pingguan-Murphy, B., Boyd, D., & Towler, M. R. (2013). A novel glass polyalkenoate cement for fixation and stabilisation of the ribcage, post sternotomy surgery: An ex-vivo study. Journal of Functional Biomaterials, 4(4), 329-357. doi:10.3390/jfb4040329
    A Novel Technique to Determine Concentration-Dependent Solvent Dispersion in Vapex
    A Novel Technique to Determine Concentration-Dependent Solvent Dispersion in Vapex
    Vapex (vapor extraction of heavy oil and bitumen) is a promising recovery technology because it consumes low energy, and is very environmentally-friendly. The dispersion of solvents into heavy oil and bitumen is a crucial transport property governing Vapex. The accurate determination of solvent dispersion in Vapex is essential to effectively predict the amount and time scale of oil recovery as well to optimize the field operations. In this work, a novel technique is developed to experimentally determine the concentration-dependent dispersion coefficient of a solvent in Vapex process. The principles of variational calculus are utilized in conjunction with a mass transfer model of the experimental Vapex process. A computational algorithm is developed to optimally compute solvent dispersion as a function of its concentration in heavy oil. The developed technique is applied to Vapex utilizing propane as a solvent. The results show that dispersion of propane is a unimodal function of its concentration in bitumen., Abukhalifeh, H., Lohi, A., & Upreti, S. R. (2009). A novel technique to determine concentration-dependent solvent dispersion in vapex. Energies, 2(4), 851-872. doi:10.3390/en20400851
    A Picturesque Photographic Tour Through Scotland
    A Picturesque Photographic Tour Through Scotland
    Originally published in: genre: An International Journal of Literature and the Arts, Vol 29: Arrivals and Departures. Ed. by Whitney Donaldson. Long Beach, California: California State University Department of Comparative Literature & Classics, 2009. Also available at the publisher's website: http://www.csulb.edu/colleges/cla/departments/complit-classics/genre/index.htm
    A Qualitative Framework for Evaluating Participation on the Geoweb
    A Qualitative Framework for Evaluating Participation on the Geoweb
    The participatory Geoweb emerges from the synthesis of map-based online applications and Web 2.0 concepts such as user-generated content, enhanced interactivity, and cloud computing. The result is a wide range of tools and projects using these tools to communicate, collaborate, deliberate, and inform spatial decision making. This article draws upon the literature in participatory geographic information systems to propose the “3E Framework,” which provides both a structured conceptual model and a practical tool for the evaluation of projects on the participatory Geoweb. The framework deconstructs participation on the Geoweb into the provider and public realms and represents the engagement, empowerment, and enactment processes. It includes 20 evaluation questions that are derived from themes in the literature., Full journal issue is open-access and available at http://www.urisa.org/resources/urisa-journal/. Download option provides an excerpt including journal title page, ToC, and this article only.
    A Review on Breathing Behaviors of Metal-Organic-Frameworks (MOFs) for Gas Adsorption
    A Review on Breathing Behaviors of Metal-Organic-Frameworks (MOFs) for Gas Adsorption
    Metal-organic frameworks (MOFs) are a new class of microporous materials that possess framework flexibility, large surface areas, “tailor-made” framework functionalities, and tunable pore sizes. These features empower MOFs superior performances and broader application spectra than those of zeolites and phosphine-based molecular sieves. In parallel with designing new structures and new chemistry of MOFs, the observation of unique breathing behaviors upon adsorption of gases or solvents stimulates their potential applications as host materials in gas storage for renewable energy. This has attracted intense research energy to understand the causes at the atomic level, using in situ X-ray diffraction, calorimetry, Fourier transform infrared spectroscopy, and molecular dynamics simulations. This article is developed in the following order: first to introduce the definition of MOFs and the observation of their framework flexibility. Second, synthesis routes of MOFs are summarized with the emphasis on the hydrothermal synthesis, owing to the environmental-benign and economically availability of water. Third, MOFs exhibiting breathing behaviors are summarized, followed by rationales from thermodynamic viewpoint. Subsequently, effects of various functionalities on breathing behaviors are appraised, including using post-synthetic modification routes. Finally, possible framework spatial requirements of MOFs for yielding breathing behaviors are highlighted as the design strategies for new syntheses., Alhamami, M., Doan, H., & Cheng, C. (2014). A review on breathing behaviors of metal-organic-frameworks (MOFs) for gas adsorption. Basel: MDPI AG. doi:10.3390/ma7043198, (This article belongs to the Section Porous Materials)
    A Scalable GeoWeb Tool for Argumentation Mapping
    A Scalable GeoWeb Tool for Argumentation Mapping
    Public participation geographic information systems (PPGIS) support collaborative decision-making in the public realm. PPGIS provide advanced communication, deliberation, and conflict resolution mecha nisms to engage diverse stakeholder groups. Many of the functional characteristics of Web 2.0 echo basic PPGIS functions including the authoring, linking, and sharing of volunteered geographic information. However, with the increasing popularity of geospatial applications on the Web comes a need to develop concepts for scalable, reliable, and easy-to-maintain tools. In this paper, we propose a cloud computing implementation of a scalable argumentation mapping tool. The tool also illustrates the opportunities of applying a Web 2.0 model to PPGIS. The searching, linking, authoring, tagging, extension, and signalling (SLATES) functions are associated with PPGIS functionality to produce a participatory GeoWeb tool for deliberative democracy.