6,007 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
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
Trachischium fuscum Blyth 1854, sp. nov
No full textRedescription of Trachischium fuscum Blyth, 1854 (Fig. 4A) Talukdar et al. (1980) designated ZSI7044 as the lectotype of Trachischium fuscum. They provided a redescription but it was brief and contained some ambiguous (such as number of VEN) and erroneous (namely SVL and TAL) information. Moreover, it lacked morphometric details and description of the novel characters used in this paper (such as 4SCW/L and 5SCW/L) used to separate T. sushantai sp. nov from T.fuscum. The aforesaid reasons necessitate the inclusion of a redescription of the lectotype of T. fuscum along with an analysis of variation in paralectotypes and non-type materials of T. fuscum. Redescription was based on the lectotype of Trachischium fuscum (ZSI7044): Adult male; SVL 325 mm and TAL 52 mm (not 305 mm and 49 mm respectively as reported by Talukdar et al. [1980]); TAL/TL ratio is 0.14; head small (HL 9.8 mm, 3.2 % of SVL), wider than its height (HW and HH 6.6 mm and 5.1 respectively); head indistinct from neck; eye small (ED 1.3 mm, 13.3 % of HL); ESN 3.7 mm; rostral slightly broader than high (width and height of rostral 1.2 mm and 1.1 mm respectively); internasals paired, much shorter than the undivided PF; length of the pentagonal frontal shield (3.6 mm) greater than its distance from the end of rostral (1.9 mm), wider than supraoculars; parietals (length 5.6 mm) longer than frontal; 1 pre- and 1 post-ocular; loreal twice wider than high; nasals divided and very small; SL (R/L) 6/6, 1 st smallest, 6th largest, 3rd and 4th touching the eye; IL (R/L) 6/6 of 4 are in contact with the genials; anterior genials longer than posterior genials; TEMP (R/L) 1+2/1+2; dorsal scales smooth except those on the basal region of tail which are keeled, DSCH:M: V 13:13:13; VEN 156; anal divided; SC 35 pairs, those one anterior half on tail around twice wider than long with 4SCW/L 2.46 and 5SCW/L 1.88. Blyth (1854) described the colour as follows ‘Of an iridescent dull black colour throughout, the ventrals slightly margined paler.’ Now the specimen has become uniformly brown, with paler margins at the trailing edge of VEN still being evident. Variations. Range of morphometric and meristic data of paralectotypes and other non-type specimens of T. fuscum are presented in Table 1. Head and dorsal scalation in this species shows almost no variation except that in ZSI18693 there is only one 1 posterior TEMP on right side. Smith (1943) reported the range of VEN as 150–165 (the lowest VEN count reported by Sharma [2007] is 132 which is most probably erroneous). The highest VEN count made by us was 169 in ZSI19120. Range of SC reported by Smith (1943) was 28–42. In ZSI18679, there are 44 pairs of SC. ZSI7059 (collected from Darjeeling) exhibits several anomalous ventral scales (Figure 4B). In this specimen, split VEN, incomplete VEN and fused VEN are present sporadically among normal VEN. This anomaly results from abnormalities on vertebrae and ribs (e.g. Shine et al. 2005; Mebert 2011). This specimen also has divided PF. Wall (1909b) found one specimen from Darjeeling which got 9 of its anterior SCs undivided. We found undivided SC in three specimens, including one paralectotype (ZSI7051). The dorsum coloration (in preservative) varies from dark brown to almost jet black. Juveniles, as reported by Wall (1909b) and Smith (1943), have longitudinal stripes and an incomplete collar over nape. Here we would like to mention that there is another specimen from Jammu deposited in ZSI general collection (ZSI25651 B) with divided nasal, VEN 150, SC 35 (first 4 undivided, rest distinctly wider than long, not regular hexagon/rhomboid shaped), SVL 227 mm and TAL 45 mm (TAL 19.8 % of SVL) and black dorsum. It can be seen that this specimen can be easily distinguished from the holotype of T. sushantai sp. nov. and we currently refer it to T. fuscum as we could not find any differences in characters from other T. fuscum of eastern Himalaya that we have studied. Distribution. T. fuscum was found from the states of Jammu & Kashmir, northern West Bengal, Uttarakhand, Sikkim, Assam and eastern Arunachal Pradesh in India, east and central Nepal and Bhutan border area (Günther 1860; Boulenger 1893; Annandale 1904; Wall 1909b; Smith 1943; Agarwal et al. 2010; Wallach et al. 2014; also see the references contained in Wallach et al. 2014). We currently regard one specimen from Jammu as T. fuscum. Also see comments on Ablabes gilgiticus. Wall (1924) regarded the locality Khasi hills (Meghalaya state) to be questionable. Natural history. T. fuscum is a montane snake and it is found between 920 and 2590 meters above sea level (Wallach et al. 2014). This snake species is semi-fossorial and live under stones and leaf litter in montane deciduous forests (Wall 1909b; Das, 2002; Agarwal et al. 2010). Though Das (2002) stated that these snakes become active after sunset, Wall (1909b) frequently found it during daytime in Darjeeling. They feed on earthworms and are of very gentle disposition (Wall 1909b). T. fuscum has a sex ratio that is skewed toward females. The specimens studied by us contained 14 males and 19 females (ratio 1:1.36). Wall (1909b) reported 37 males and 51 females among 88 specimens of which he determined the sex. A similar type of skewed sex ratio was reported for T. guentheri by Wall (1909b) and Chettri et al. (2009). The clutch size of T. fuscum was reported to be 3–6 (Wall 1909b). We found 9 eggs in ZSI19120 (from Gopaldhara, Darjeeling, West Bengal) (Figure 4C). This is the highest number of eggs reported for any Trachischium spp. to date. Hatchlings of this species were seen by Wall (1909b) in Darjeeling in July.Published as part of Raha, Sujoy, Das, Sunandan, Bag, Probhat, Debnath, Sudipta & Pramanick, Kousik, 2018, Description of a new species of genus Trachischium with a redescription of Trachischium fuscum (Serpentes: Colubridae: Natricinae), pp. 549-561 in Zootaxa 4370 (5) on pages 553-555, DOI: 10.11646/zootaxa.4370.5.6, http://zenodo.org/record/114735
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
Genes r us? Making sense of genetic and non-genetic relationships following anonymous donor insemination
No full textThis exploratory qualitative study investigates the experiences of eight adults conceived following anonymous sperm donation who had discovered the identity both of their donor and of donor half-siblings and had established contact with each other. It focuses primarily on participants’ reflections on genetic and social kinship relationships. Data were collected from this group as well as from the son of the donor and the donor-conceived half-sister of one participant by means of semistructured interviews utilizing asynchronous email and digitalized voice recording. Participants discussed their experience of genetic disconnection resulting from learning of their donor-conceived status and of revising their personal biographies and developing new kinship networks as a result of discovering the identity of their donor and the existence of donor half-siblings. The study highlights participants’ agency expressed through their ability to draw on both genetic and non-genetic elements of their inheritance to redefine their self-identity and extend their familial/kinship networks in meaningful ways.
This paper reports findings from a study investigating the experiences of eight adults who learned of their conception following anonymous donor insemination provided by the same fertility clinic, the identity of their shared donor and their relatedness to each other and who had subsequently established communications with each other. The donor-conceived sister of one participant and the son of the donor also participated. Data were collected by means of email communications using a semi-structured interview schedule. The specific focus of this paper examines participants’ experiences of genetic disconnection resulting from learning of their donor-conceived status and of revising their personal biographies and developing new kinship networks as a result of discovering the identity of their donor and the existence of donor half-siblings. It concludes that participants were able to draw on both genetic and non-genetic elements of their ‘roots’ in order to redefine their self-identity and extend their familial/kinship network
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