10,079 research outputs found
Simulating the LHC collimation system with the accelerator physics library MERLIN, and loss map results
No full textWe present large scale simulations of the LHC collimation system using the MERLIN code for calculations of loss maps, currently using up to 1.5 × 10**9 halo particle
The MERLIN Simulation Program: New Features used in Studies of the LHC Collimation System using MERLIN
No full textWe present recent developments in the MERLIN particle
tracking simulation code, originally developed at DESY.
We have implemented differential scattering cross-sections
based on a pomeron exchange model interpolated over experimental
measurement data, and show that this model is
important at the small scattering angles generated in the
LHC collimators. Preliminary comparisons with previous
simulations are presented
Hi-Lumi LHC Collimation Studies with MERLIN Code
No full textThe collimation system is key to the successful operation of the LHC. Measurements and simulations of the previous run at 4 TeV have shown that the system is ready for the next step, running at 7 TeV, but at the same time some sensitive cleaning locations have been identified. In particular the dispersion suppressors downstream of the betatron
cleaning region in IR7 are sensitive to single diffractive scattered protons from the collimator jaws. These particles can lead to magnet quenching. The MERLIN C++ library has been developed to exploit the functionality of an object oriented code, with improved collective effects and scattering routines. New single diffractive and elastic scattering routines, based on a fit of existing experimental data with the Regge theory of soft interactions of high energy scattering, is implemented in MERLIN. In this paper we present the impact of the new single diffractive scattering physics on the cleaning inefficiency of the LHC collimation system for the Achromatic Telescope Squeezing (ATS) PreSqueeze optics scheme, for the HL-LHC project. The results are compared with the same loss map calculated using a SixTrack+K2 like scattering routine
Algoe, Merlin D, Phillippines
No full textThis record was harvested from a previous catalogue system and will be withdrawn in 2025. Information in this record may be superseded or incomplete. Visit this record in UMA's new catalogue at: https://archives.library.unimelb.edu.au/nodes/view/368158Surname: ALGOE
Given Name(s) or Initials: MERLIN D
Military Service Number or Last Known Location: PHILLIPPINES
Missing, Wounded and Prisoner of War Enquiry Card Index Number: 19947178204
Item: [2016.0049.00489] "Algoe, Merlin D, Phillippines
When King Arthur met the Venus : Romantic Antiquarianism and the Illustration of Anne Bannerman’s “The Prophecy of Merlin”
No full textThe first edition of Bannerman’s Tales of Superstition and Chivalry (1802) contained an erotic engraving of a naked Venus figure, which was declared ‘offensive to decency’ by Scottish audiences in the poet’s native Edinburgh. Garner’s account investigates the controversy surrounding the engraving and the puzzling disparity between it and the ballad it illustrated: the Arthurian-themed ‘Prophecy of Merlin’. Using evidence from Bannerman’s correspondence with noted Scottish male publishers and antiquarians, this essay argues that decision to include the dangerous engraving was symptomatic of current anxieties surrounding a female-authored text which threatened to encroach on antiquarian and Arthurian enquiry.Peer reviewe
Lailoken (or Merlin Silvester)
No full textWard H. L.-D. Lailoken (or Merlin Silvester). In: Romania, tome 22 n°88, 1893. pp. 504-526
J. D. Beazley. Attische Vasenmaler des rotfigurigen Stils
No full textMerlin Alfred. J. D. Beazley. Attische Vasenmaler des rotfigurigen Stils. In: Journal des savants, Mai 1926. pp. 228-229
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Letter from Sénateur Henri Fargues, Paris, to Philippe-Antoine Merlin, Paris, 1802 May.
No full textLetter from "le Sénateur Fargues au Citoyen Merlin, Commre. du gouvt. prés le trib. d cassation," dated Paris, [27?] floréal, an 10 de la République, and accompanying envelope. Remnants of seal on envelope
Group outside D. Wright's Queensland Hotel, Gulgong, New South Wales, ca. 1872 [picture].
No full textTitle devised by cataloguer based on information from acquisitions documentation and reference source.; Part of the collection: B.O. Holtermann archive of Merlin and Bayliss photographic prints of New South Wales and Victoria.; Variously attributed to Charles Bayliss and Beaufoy Merlin.; Inscriptions: "18419"--In pencil on verso.; Condition: Yellowing, wear upper right edge.; Also available in electronic version via the Internet at: http://nla.gov.au/nla.pic-vn4652462; Purchased through Sydney dealer Josef Lebovic, 2008
Characterization of FERM domain proteins, Merlin and Moesin, in Drosophila
No full textMerlin and the ezrin-radixin-moesin (ERM) proteins are key organizers of the cell cortex through linking membrane-associated proteins to the underlying actin cytoskeleton. Merlin and the ERM proteins have been implicated in the maintenance of cell integrity, adhesion, and motility during tissue development and organization. Functional redundancies between the ERM proteins remain a challenge to further elucidating ERM protein function in mammals. Furthermore, the precise mechanisms underlying the tissue-specific defects associated with the loss of merlin still remain unclear. Thus, we use Drosophila melanogaster as a model organism to further investigate the functional significance of Merlin and Moesin, the single Drosophila orthologues of merlin and the ERM proteins. Biochemical studies have demonstrated that mammalian merlin interacts with ezrin-binding phosphoprotein 50 (EBP50), which is an essential scaffold protein in ERM-mediated membrane organization. However, the functional significance of the merlin and EBP50 interaction still remains unclear. We used Drosophila as a model organism to further characterize the interaction between Merlin and Sip1, the Drosophila orthologue of EBP50. We found that Merlin and Sip1 genetically interact. In vitro binding assays showed that the α-helical domain of Merlin was important for Sip1 binding. Specifically, mutation of two conserved arginine residues within the α-helical domain of Merlin reduced binding to Sip1 and altered Merlin subcellular localization and trafficking in Drosophila wing epithelia and cell culture. When Merlin with reduced binding to Sip1 was expressed in the adult wings, the area of the wing region increased. Furthermore, reduced Merlin and Sip1 binding led to defects in epithelial organization in the follicle cell epithelium surrounding the developing oocyte. These findings suggest that Merlin and Sip1 binding is important for growth inhibition and epithelial organization in Drosophila. As the loss of merlin is associated with the development of central nervous system tumours in humans, the functional significance of Drosophila Merlin was further investigated in a neuronal context. Within the Drosophila optic lobe, neuroepithelial cells differentiate into neural progenitors or neuroblasts, which give rise to the neurons essential for the adult visual system. Multiple signaling pathways have been linked to neuroepithelial cell proliferation and differentiation. We found that both Merlin and Sip1 localized to the neuroepithelial cells and neuroblasts within the developing optic lobe. Loss of Merlin and Sip1 led to defects in optic lobe development. Although the mechanisms still remain largely unknown, these findings suggest that Merlin and Sip1 may regulate neuroepithelial cell proliferation or differentiation. Drosophila neuroblast asymmetric cell division requires an intact actomyosin network for anchoring polarity proteins to the cell cortex and maintaining cell size asymmetry. However, the mechanisms that regulate actomyosin dynamics during neuroblast asymmetric cell division have not been extensively studied. We found that Moesin is essential for neuroblast proliferation and mitotic progression in the developing brain. During metaphase, phosphorylated Moesin (p-Moesin) was enriched at the apical cortex and loss of Moesin led to defects in apical polarity maintenance and cortical stability. This asymmetric distribution of p-Moesin was regulated by components of the apical polarity complex. During early anaphase, p-Moesin remained enriched at the apical cortex, which appeared to contribute to asymmetric cortical extension and myosin basal furrow positioning. Therefore, our findings reveal Moesin as a novel apical polarity protein that drives cortical remodelling of dividing neuroblasts, essential for polarity maintenance and initial establishment of cell size asymmetry. Together, this work provides further insight into the role of Merlin and Moesin in cell or tissue organization during Drosophila development
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