Geometrical and topological issues in octree based automatic meshing

Finite element meshes derived automatically from solid models through recursive spatial subdivision schemes (octrees) can be made to inherit the hierarchical structure and the spatial addressability intrinsic to the underlying grid. These two properties, together with the geometric regularity that can also be built into the mesh, make octree based meshes ideally suited for efficient analysis and self-adaptive remeshing and reanalysis. The element decomposition of the octal cells that intersect the boundary of the domain is discussed. The problem, central to octree based meshing, is solved by combining template mapping and element extraction into a procedure that utilizes both constructive solid geometry and boundary representation techniques. Boundary cells that are not intersected by the edge of the domain boundary are easily mapped to predefined element topology. Cells containing edges (and vertices) are first transformed into a planar polyhedron and then triangulated via element extractor. The modeling environments required for the derivation of planar polyhedra and for element extraction are analyzed

Construction & deconstruction of linguistic otherness: conflict & cooperative code-switching in (English/) bilingual classrooms

The socio-cultural settings of English-language and Englishmedium classrooms are intrinsically bi/multilingual and bi/multicultural as both learners and teachers bring their multiple identities and home-community languages and sociolinguistic practices into the classroom. However, more often than not in such contexts, monolingual ideologies are the guiding principle for the top-down language education policies of “one-language only” which often create conflict and tension. In a post-colonial context, this paper looks at how monolingual ideologies and policies construct L1 as “the linguistic other” in face-to-face interaction in English classrooms which are defined as “English-only”. It also shows how the essentialisation of the English classroom’s socio-cultural spaces as non-local is met with resistance through the use of L1 which is informed by the local/national ideologies and constructs English as “the other”. Against such a conflict scenario, it finds that code-switching is employed by the participants in some classrooms to achieve pedagogical goals and to resolve the tension which also deconstructs the positioning of both English and L1 as “the linguistic other”. The paper employs multilayered analyses and draws on data from ethnographic research based in the classroom and community contexts. The data includes, amongst other, transcripts of classroom interactions and opinions of teachers and students about their language choices in such interactions. The findings of the paper suggest that an appreciation of the potential of the positive power, the constructive resistance and the resource argument of L1 use in English classrooms can lead to deconstructing the essentialist meanings of “the linguistic other”

Left Out By the Pied Piper: The U.N. Response to Children in Localized Conflict Settings

States have been reluctant to define and address child participation in internal secessionist movements. Unlike past civil wars, in which the international community was authorized to intervene in armed conflicts within failed states, the current conflicts occur in states that adhere to democratic rule of law. Further, these modern-day conflicts are not labeled as armed conflicts. Continued advocacy is necessary to encourage international organizations to utilize the approaches applied to child participation in armed conflicts to child participation in localized secessionist movements. This must include urging states to enact domestic legislation to protect child participants in the conflicts

A hierarchical structure for automatic meshing and adaptive FEM analysis

A new algorithm for generating automatically, from solid models of mechanical parts, finite element meshes that are organized as spatially addressable quaternary trees (for 2-D work) or octal trees (for 3-D work) is discussed. Because such meshes are inherently hierarchical as well as spatially addressable, they permit efficient substructuring techniques to be used for both global analysis and incremental remeshing and reanalysis. The global and incremental techniques are summarized and some results from an experimental closed loop 2-D system in which meshing, analysis, error evaluation, and remeshing and reanalysis are done automatically and adaptively are presented. The implementation of 3-D work is briefly discussed

RETRACTED: An Energy Based Approach to Determine the Plastic Limit of Fine-grained Soil Using Modified Cone Penetrometer

This article has been retracted: please see Elsevier Policy on Article Withdrawal (http://www.elsevier.com/locate/withdrawalpolicy).This article has been retracted at the request of scientific committee of RAEREST 2016.The authors have plagiarized part of a paper that had already appeared in Proceedings of the Institution of Civil Engineers - Geotechnical Engineering, 168 (2015) 53 - 64. DOI: 10.1680/geng.14.00004. One of the conditions of submission of a paper for publication is that authors declare explicitly that their work is original and has not appeared in a publication elsewhere. Re-use of any data should be appropriately cited. As such this article represents a severe abuse of the scientific publishing system. The scientific community takes a very strong view on this matter and apologies are offered to readers of the journal that this was not detected during the submission process

Stiffness analysis of symmetric cross-ply laminated composite plates

Stiffness of a cross-ply laminated composite plate has been investigated with aspect ratios (AR) for different orientation sequences of laminate using finite element method (FEM). A simply supported plate with uniform distributed load has been considered for present analysis. A MATLAB code has been developed to find out the deflection of the laminated composite plates. The same has also been analyzed using ANSYS software. The computational results have been compared with the theoretical results (classical lamination theory) and a good agreement has been found. When number of lamina is increased with 90 degree domination or decreased with 0degree domination under the condition AR less than 1 and increased with 0degree domination or decreased with 90 degree domination under the condition AR greater than 1, higher stiffness was observed.Keywords: Laminated composites plates, classical lamination theory, finite element analysis, stiffnes

A sociolinguistic study of Panjabi Hindus in Southall : language maintenance and shift

SIGLEAvailable from British Library Document Supply Centre- DSC:DXN002740 / BLDSC - British Library Document Supply CentreGBUnited Kingdo

Microwave-assisted synthesis, characterization and tribological properties of a g-C3N4/MoS2 nanocomposite for low friction coatings

This study explores the tribological performance of microwave-assisted synthesized g-C3N4/MoS2 coatings. The two-dimensional transition metal dichalcogenide (TMD) nanosheet is getting prominence in the study of tribology due to its layered structure. The graphitic carbon nitride (g-C3N4) nanosheet was made using the calcination method and its nanocomposite with molybdenum disulfide (MoS2) was produced using a microwave-assisted method. The structure and morphology of the samples were characterized by some well-known methods, and tribological properties were studied by a pin-on-disc (POD) apparatus. Morphological analysis revealed that graphitic carbon nitride and molybdenum disulfide coexisted, and the layer structured MoS2 was well dispersed on graphitic carbon nitride nanosheets. BET analysis was used to determine the pore volume and specific surface area of the synthesized materials. The inclusion of MoS2 nanoparticles caused the composite's pore volume and specific surface area to decrease. The reduction in g-C3N4 pore volume and specific surface area confirmed that the pores of calcinated graphitic carbon nitride were filled with MoS2 nanoparticles. The tribological property of g-C3N4/MoS2 nanocomposite was systematically investigated under different factors such as applied loads (5N to 15N), sliding speed (500 to 1000 mm/s) and material composition (uncoated, MoS2-coated, 9 wt.% of g-C3N4 and 20 wt.% of g-C3N4 in the composite). The optimal composite material ratio was taken 9%, by weight of g-C3N4 in the g-C3N4/MoS2 composite for a variety of levels of loads and sliding speeds. The results indicates that the incorporation of g-C3N4 in nanocomposites could reduce friction and improve wear life, which were better than the results with single MoS2. This study demonstrates a solution to broaden the possible uses of g-C3N4 and MoS2-based materials in the field of tribology.Web of Science1212art. no. 184

Spin distribution as a probe to investigate the dynamical effects in fusion reactions

The spin distributions are measured for the compound nucleus 80Sr populated in the reactions 16O+64Zn and 32S+48Ti. The comparison of the experimental results for both the systems shows that the mean γ-ray multiplicity values for the system 32S+48Ti are lower than those for 16O+64Zn. The spin distribution of the compound nucleus populated through the symmetric channel is also found to be lower than the asymmetric channel. Present investigation directly shows the effect of entrance channel mass asymmetry on the reaction dynamics