5,503 research outputs found
SC author and illustrator Kate Salley Palmer signing book
No full textPhotograph of SC author and illustrator Kate Salley Palmer signing boo
Book signing by SC author and illustrator Kate Salley Palmer
No full textPhotograph of Book signing by SC author and illustrator Kate Salley Palme
Indigenous lac culture and local livelihood: a case study of Karbi community of Assam, North-Eastern India
No full textThe indigenous lac culture of Karbi community inhabiting West Karbi Anglong district of Assam is highlighted in this paper. A total of 114 knowledge holders were identified through chain referrals method from three representative villages of Ameri Block for the study. Karbis reared lac insects twice in a year on naturally growing host plants either in the forest areas or in homegardens. A total of eight unique host plants except Ziziphus mauritiana and Ficus religiosa were observed to be used by the community for rearing lac insect. They preferred bigger host plants such as, Ficus benghalensis, F. religiosa and Albizia lucidior due to higher lac yield and lesser labour requirement. An individual F. religiosa and F. benghalensis tree could produce about 120-200 kg of sticklac in a season. The average annual household production of sticklac ranged from 679 to 776 kg in the studied villages and contributed to about 25-30% of annual household income. Karbis traditionally use lac as natural dye, binding agent, polishing earthen pots and also as medicine for chest and joint pains. Factors like uncertain production, high fluctuation in market prices and unorganized nature of the venture have been identified as the major constraints for the sustainability and up-scaling the practice
High-resolution clean-sc
No full textIn this paper a high-resolution extension of CLEAN-SC is proposed: HR-CLEAN-SC. Where CLEAN-SC uses peak sources in “dirty maps” to define so-called source components, HR-CLEAN-SC takes advantage of the fact that source components can likewise be derived from points at some distance from the peak, as long as these “source markers” are on the main lobe of the Point Spread Function (PSF). This is very useful when sources are closely spaced together, such that their PSFs interfere. Then, alternative markers can be sought in which the relative influence by PSFs of other source positions is minimised. For those markers the source components better agree with the actual sources, which allows for better estimation of their locations and strengths. This paper outlines the theory needed to understand this approach and discusses applications to 2D and 3D microphone array simulations with closely spaced sources
SC author and illustrator Kate Salley Palmer talking to event attendees
No full textPhotograph of SC author and illustrator Kate Salley Palmer talking to Rita Lewi
Ca-modified Al–Mg–Sc alloy with high strength at elevated temperatures due to a hierarchical microstructure
No full textAl-Mg alloys are normally prone to lose part of their yield and tensile strength at high temperatures due to insufficient thermal stability of the microstructure. Here, we present a Ca-modified Al–Mg–Sc alloy demonstrating high strength at elevated temperatures. The microstructure contains Al4Ca phases distributed as a network along the grain boundary and Al3(Sc,Zr) nano-particles dispersed within the grains. The microstructure evolution and age-hardening analysis indicate that the combination of an Al4Ca network and Sc-rich nano-particles leads to excellent thermal stability even upon aging at 300 °C. The tensile strength of the alloy for temperatures up to 250 °C is significantly improved by an aging treatment and is comparable with the commercial heat-resistant aluminum alloys, i.e., A356 and A319. At a high temperature of 300 °C, the tensile strength is superior to the above-mentioned commercial alloys, even more so when expressed as the specific strength due to the low density of Ca-modified Al–Mg–Sc alloy. The excellent high-temperature strength results from a synergistic effect of solid solution strengthening, grain boundary strengthening and nanoparticle order strengthening.Green Open Access added to TU Delft Institutional Repository ‘You share, we take care!’ – Taverne project https://www.openaccess.nl/en/you-share-we-take-care Otherwise as indicated in the copyright section: the publisher is the copyright holder of this work and the author uses the Dutch legislation to make this work public.Novel Aerospace Material
SC-Square: Overview to 2021.
No full textThis extended abstract was written to accompany an invited talk at the 2021 SC-Square Workshop, where the author was asked to give an overview of SC-Square progress to date. The author first reminds the reader of the definition of SC-Square, then briefly outlines some of the history, before picking out some (personal) scientific highlights
SC-Square: Overview to 2021.
No full textThis extended abstract was written to accompany an invited talk at the 2021 SC-Square Workshop, where the author was asked to give an overview of SC-Square progress to date. The author first reminds the reader of the definition of SC-Square, then briefly outlines some of the history, before picking out some (personal) scientific highlights
Supply Chain (SC) Network Optimization
No full textSupply chain network design and optimization is one of the most important strategic decisions that an organization has to make. SC network design decisions are strategic-level SC decisions because they have long-lasting effect on the firms' supply chain performance and the decisions cannot be changed in a short period. In this chapter, the author aims to introduce the concept of SC network optimization to the managers of medium-sized enterprises. The chapter also explains the importance of the SC network optimization studies, educates readers about how they can benefit from the concept, and tries to show how the implementation of SC network optimization/design will improve the competitiveness of these organizations. The readers are also guided through the four steps of SC network optimization process. Finally, the chapter provides a brief review of the SC network optimization literature and proposes future research directions. </jats:p
The turbulence structure of 3D separation (Stall Cells) over an airfoil
No full textThe flow over airfoils that experience separation of the trailing edge type becomes three-dimensional at angles of attack around maximum lift and Stall Cells (SCs) form. SCs are large scale coherent structures of separated flow that consist of two counter-rotating vortices. In the present study the turbulence structure of a SC over a rectangular wing is investigated using Stereo PIV measurements. It is found that the turbulence characteristics of the flow are highly anisotropic and that the Boussinesq approximation is invalid. High values of normal Reynolds stresses in the SC vortices and the separation shear layer region indicates a wandering motion of the former and a flapping motion of the latter. Based on the available data the relation between Reynolds stresses, their production terms and the mean flow gradients is examined. It is found that at the centre of the SC, between the two vortices, the flow characteristics resemble those of a double shear layer while at the vortex region the effect of the vortices leads to double peaks in production terms
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