cometadata/datacite-rtg-text-other-reclassification-records huggingface dataset:
Molecular diversity in cyclization of Ugi-products leading to the synthesis of 2,5-diketopiperazines: computational study
Creators: name: Mommahed Heravi, Majid
name: Zadsirjan, Vahideh
name: Shiri, Morteza
name: Hosseinnejad, Tayebeh
name: Shintre, Suhas A.
name: Koorbanally, Neil A.
Publisher: name: figshare
Year: 2022
Subjects: subject: 30302 Nanochemistry and Supramolecular Chemistry
subject: FOS: Chemical sciences
subject: 30502 Natural Products Chemistry
subject: 30205 Non-metal Chemistry
subject: Nuclear Chemistry
subject: 39904 Organometallic Chemistry
subject: 30701 Quantum Chemistry
subject: Organic Chemistry
subject: 30599 Organic Chemistry not elsewhere classified
subject: 30303 Optical Properties of Materials

description: Ugi-adducts were obtained via a one-pot four-component reaction of divergent aldehydes, amines, aroylacrylic acids and isocyanide in methanol. These products were subjected to intramolecular Michael addition in the presence of K2CO3 in DMF at room temperature to afford a single product. Literally, the formation of two heterocyclic systems, 6-membered diones or 7-membered diones are possible, which could not be identified by conventional spectroscopic methods. The X-ray crystallographical data was obtained for one selected product, which indicated preferential formation of the corresponding 6-membered dione. In order to establish the generality of this mode of cyclization, the quantum chemistry calculations were performed. The obtained results confirmed the favorable formation of 6-membered diones in the gas and also several solution phases. All the products were screened for their antibacterial and antifungal activities.
Pseudagrion bengalense Laidlaw.
Creators: name: Lieftinck, M. A.
Publisher: name: Zenodo
Year: 1935
Subjects: Biodiversity
Taxonomy
Animalia
Arthropoda
Insecta
Odonata
Coenagrionidae
Pseudagrion
Pseudagrion bengalense

description: 60. Pseudagrion bengalense Laidlaw. - Tapanoeli Res.: 1 ♀. Lake Toba. March 1922. Dammerman leg.; Lake Toba and Samosir (Schmidt). Westcoast Res.: Padangsche Bovenlande'n; Korintji (Ris).
description: Published as part of Lieftinck, M. A., 1935, A Synopsis of the Odonata (Dragonflies) of Sumatra, pp. 1-23 in Miscellanea Zoologica Sumatrana 1 on page 11, DOI: 10.5281/zenodo.3251875
description: {"references": ["Schmidt, E. Odonatader Deutschen Iimnologischen Sunda-Expedition. Arch. Hydrobiol. Suppl. 13, Bd. 5. 1934.", "Ris. F. Odonaten von Sumatra, gesammelt von Edward Jacobson. Zool. Meded. Leiden. 10. 1927."]}
Process Optimization and Downscaling of a Single Electron Single Dot Memory
Creators: name: Krzeminski, Christophe
name: Tang, Xiaohui
name: Reckinger, Nicolas
name: Bayot, Vincent
name: Dubois, Emmanuel
Publisher: name: arXiv
Year: 2011
Subjects: subject: Materials Science (cond-mat.mtrl-sci)
subject: Emerging Technologies (cs.ET)
subject: FOS: Physical sciences
subject: FOS: Computer and information sciences

description: This paper presents the process optimization of a single-electron nanoflash electron memory. Self-aligned single dot memory structures have been fabricated using a wet anisotropic oxidation of a silicon nanowire. One of the main issue was to clarify the process conditions for the dot formation. Based on the process modeling, the influence of various parameters (oxidation temperature, nanowire shape) has been investigated. The necessity of a sharp compromise between these different parameters to ensure the presence of the memory dot has been established. In order to propose an aggressive memory cell, the downscaling of the device has been carefully studied. Scaling rules show that the size of the original device could be reduced by a factor of 2. This point has been previously confirmed by the realization of single-electron memory devices.
A method for determining the V magnitude of asteroids from CCD images
Creators: name: Dymock, Roger
name: Miles, Richard
Publisher: name: arXiv
Year: 2010
Subjects: subject: Earth and Planetary Astrophysics (astro-ph.EP)
subject: FOS: Physical sciences

description: We describe a method of determining the V magnitude of an asteroid using differential photometry, with the magnitudes of comparison stars derived from Carlsberg Meridian Catalogue 14 (CMC14) data. The availability of a large number of suitable CMC14 stars enables a reasonably accurate magnitude (\pm0.05 mag) to be found without having to resort to more complicated absolute or all-sky photometry. An improvement in accuracy to \pm0.03 mag is possible if an ensemble of several CMC14 stars is used. This method is expected to be less accurate for stars located within \pm10deg of the galactic equator owing to excessive interstellar reddening and stellar crowding.
description: 8 pages, 6 figures, 4 tables
Resonant Inelastic X-ray Scattering Studies of Elementary Excitations
Creators: name: Ament, Luuk J. P.
name: van Veenendaal, Michel
name: Devereaux, Thomas P.
name: Hill, John P.
name: Brink, Jeroen van den
Publisher: name: arXiv
Year: 2010
Subjects: subject: Strongly Correlated Electrons (cond-mat.str-el)
subject: Materials Science (cond-mat.mtrl-sci)
subject: FOS: Physical sciences

description: In the past decade, Resonant Inelastic X-ray Scattering (RIXS) has made remarkable progress as a spectroscopic technique. This is a direct result of the availability of high-brilliance synchrotron X-ray radiation sources and of advanced photon detection instrumentation. The technique's unique capability to probe elementary excitations in complex materials by measuring their energy-, momentum-, and polarization-dependence has brought RIXS to the forefront of experimental photon science. We review both the experimental and theoretical RIXS investigations of the past decade, focusing on those determining the low-energy charge, spin, orbital and lattice excitations of solids. We present the fundamentals of RIXS as an experimental method and then review the theoretical state of affairs, its recent developments and discuss the different (approximate) methods to compute the dynamical RIXS response. The last decade's body of experimental RIXS data and its interpretation is surveyed, with an emphasis on RIXS studies of correlated electron systems, especially transition metal compounds. Finally, we discuss the promise that RIXS holds for the near future, particularly in view of the advent of x-ray laser photon sources.
description: Review, 67 pages, 44 figures
A fast divide-and-conquer algorithm for indexing human genome sequences
Creators: name: Loh, Woong-Kee
name: Moon, Yang-Sae
name: Lee, Wookey
Publisher: name: arXiv
Year: 2010
Subjects: subject: Databases (cs.DB)
subject: FOS: Computer and information sciences

description: Since the release of human genome sequences, one of the most important research issues is about indexing the genome sequences, and the suffix tree is most widely adopted for that purpose. The traditional suffix tree construction algorithms have severe performance degradation due to the memory bottleneck problem. The recent disk-based algorithms also have limited performance improvement due to random disk accesses. Moreover, they do not fully utilize the recent CPUs with multiple cores. In this paper, we propose a fast algorithm based on 'divide-and-conquer' strategy for indexing the human genome sequences. Our algorithm almost eliminates random disk accesses by accessing the disk in the unit of contiguous chunks. In addition, our algorithm fully utilizes the multi-core CPUs by dividing the genome sequences into multiple partitions and then assigning each partition to a different core for parallel processing. Experimental results show that our algorithm outperforms the previous fastest DIGEST algorithm by up to 3.5 times.
description: 8 pages, 9 figures
Inventer la Grande Moscou : contenu, formes et supports de diffusion du plan stalinien de 1935
Creators: name: Élisabeth Essaïan
Publisher: name: Collectif Inventer le Grand Paris
Year: 2014

description: La fin des années 1920 en URSS est marquée par un important débat portant sur le contenu et la forme de la ville socialiste[1], qui réunit divers acteurs, urbanistes, sociologues, médecins, économistes. Tout en partageant une vision commune de la nouvelle société - collectivisation du mode de vie, éclatement de la cellule familiale, décentralisation - ils proposent des formes différentes de répartitions territoriales et d’habiter. Aux deux pôles opposés se trouvent ceux qui seront nommés, de manière critique, les ourbanisty et les dezourbanisty, dont les positions sont portées par deux économistes du Gosplan, Leonid Sabsovitch et Mikhaïl Okhitovitch. Le premier...
Inelegibilidad e irrelegibilidad en el derecho publico latinoamericano
Creators: name: Rozo Acuña, Eduardo
Publisher: name: Studi Urbinati - Serie A
Year: 2014

description: Si tratta di presentare la situazione attuale in materia di ineligibità e non rielezione nel costituzionalismo in vigore nell’America Latina. Più specificamente si tratta di fare vedere quali sono le tendenze più recenti del diritto pubblico latinoamericano per quanto riguarda la tematica dell’elezione e il divieto di rielezione alle cariche di rappresentazione popolare nel subcontinente americano.
description: Studi Urbinati - Serie A, Vol 58, N° 1 (2007)
Protein interactions of membrane protein U24 from Roseolovirus and implications for its function
Creators: name: Sang, Yurou
Publisher: name: University of British Columbia
Year: 2016

description: This dissertation describes the investigation of the interactions between the tail-anchored membrane protein U24 from Human Herpesvirus type 6A (HHV-6A) and type 7 (HHV-7) and its potential binding partners. The roles that these interactions play in U24s’ function will be presented. It has been suggested that U24 from HHV-6A (U24-6A) may trigger an autoimmune reaction in multiple sclerosis (MS), through its molecular mimicry of myelin basic protein (MBP). Both versions of U24 have been implicated in endocytic recycling via specific binding partners, namely WW domains. The first part of this thesis is a review of the foundations that this thesis is based on, from the description of Roseoloviruses, associated diseases to molecular characterizations. The two main techniques used in the studies will be described as well. Prior to commencing any structural or interaction studies, a protocol is devised to express and purify recombinant U24 from HHV-7 (U24-7), as well as preliminary studies to prepare samples suitable for structure determination by nuclear magnetic resonance (NMR) spectroscopy. U24-6A was shown to be a mimic of MBP and it was suggested that it could be implicated in MS by competing with MBP for its interactions, such as the interactions with Fyn-SH3 domain. The interactions between U24-6A and Fyn-SH3 domain were therefore probed and found to be weak, calling into question this mimicry hypothesis. Because of the weak binding with Fyn-SH3 domain, alternative functions and binding partners were then explored. WW domains were chosen because their binding ligand, the PPxY (PY) motif, is present in U24 and was identified to be essential for U24’s function. In the next part of this thesis, the investigation of the interactions between U24s and WW domains in Nedd4, which is a key component required for endocytosis, are described. U24-7 and phosphorylated U24-6A were found to bind strongly to Nedd4-WW domains, suggesting the negative charge upstream from PY motif in U24 is important for high affinity interactions. Non-canonical Smurf2 WW domains were explored as well. Finally, the results presented in this thesis will be discussed in the context of the function of U24.
Spunti per una riconsiderazione del principio canonistico “ex nudo pacto oritur actio”
Creators: name: Scigliano, Fabio
Publisher: name: Studi Urbinati - Serie A
Year: 2014

description: L’autore intende fare il punto sul principio canonistico “ex nudo pacto oritur actio” e proporre nuovi spunti interpretativi alla luce delle fonti medievali.Partendo dalla constatazione che il “dare la parola” si configura come impegno di condotta, egli prospetta una più attenta considerazione della teoria canonistica delle obbligazioni da promessa che si rivela alternativa ai principi civilistici che nello stesso periodo si andavano affermando. Fondata sulla centralità della ratio peccati e della ratio scandali, tale teoria affermava la piena efficacia del patto nudo e della promessa intesa non come dovere morale ma come vera e propria regola giuridica, la cui obbligatorietà si riconosceva esclusivamente sulla base della causa naturalis. Il fondamento di diritto divino naturale della sua efficacia, pertanto finiva per produrre un’inseparabilità dell’obbligazione di coscienza dall’obbligazione giuridica. Allo stesso tempo, l’accoglimento da parte dei canonisti medievali del tema dell’obligatio peccati, mutuata dalla coeva teologia, sembra poi trovare conferma nella scelta del rimedio processuale configurato nella denunciatio evangelica che, assumendo la forma dell’imploratio officii iudicis, veniva a caratterizzarsi come lo strumento di tutela (actio) dell’obbligazione derivante dalla promessa.
description: Studi Urbinati - Serie A, Vol 58, N° 1 (2007)
Pseudagrion decorum Ramb.
Creators: name: Lieftinck, M. A.
Publisher: name: Zenodo
Year: 1935
Subjects: Biodiversity
Taxonomy
Animalia
Arthropoda
Insecta
Odonata
Coenagrionidae
Pseudagrion
Pseudagrion decorum

description: 61. Pseudagrion decorum (Ramb.). - Eastcoast Gvt.: Deli. ♂ Soekaranda (Kruger). This record needs confirmation.
description: Published as part of Lieftinck, M. A., 1935, A Synopsis of the Odonata (Dragonflies) of Sumatra, pp. 1-23 in Miscellanea Zoologica Sumatrana 1 on page 11, DOI: 10.5281/zenodo.3251875
description: {"references": ["Kruger. L. Die Odonaten von Sumatra. I ~ III. Stett. ent. Zeitg. 59 - 63. 1898 - 1902."]}
The chain sucker: translocation dynamics of a polymer chain into a long narrow channel driven by longitudinal flow
Creators: name: Luo, Kaifu
name: Metzler, Ralf
Publisher: name: arXiv
Year: 2011
Subjects: subject: Soft Condensed Matter (cond-mat.soft)
subject: Statistical Mechanics (cond-mat.stat-mech)
subject: Biomolecules (q-bio.BM)
subject: FOS: Physical sciences
subject: FOS: Biological sciences

description: Using analytical techniques and Langevin dynamics simulations, we investigate the dynamics of polymer translocation into a narrow channel of width $R$ embedded in two dimensions, driven by a force proportional to the number of monomers in the channel. Such a setup mimics typical experimental situations in nano/micro-fluidics. During the the translocation process if the monomers in the channel can sufficiently quickly assume steady state motion, we observe the scaling $τ\sim N/F$ of the translocation time $τ$ with the driving force $F$ per bead and the number $N$ of monomers per chain. With smaller channel width $R$, steady state motion cannot be achieved, effecting a non-universal dependence of $τ$ on $N$ and $F$. From the simulations we also deduce the waiting time distributions under various conditions for the single segment passage through the channel entrance. For different chain lengths but the same driving force, the curves of the waiting time as a function of the translocation coordinate $s$ feature a maximum located at identical $s_{\mathrm{max}}$, while with increasing the driving force or the channel width the value of $s_{\mathrm{max}}$ decreases.
description: 9 pages, 14 figures. To appear in J. Chem. Phys
Wafer-scale selective area growth of GaN hexagonal prismatic nanostructures on c-sapphire substrate
Creators: name: Chen, Xiao Jun
name: Hwang, Jun-Seo
name: Perillat-Merceroz, Guillaume
name: Landis, Stefan
name: Martin, Brigitte
name: Dang, Daniel Le Si
name: Eymery, Joël
name: Durand, Christophe
Publisher: name: arXiv
Year: 2011
Subjects: subject: Materials Science (cond-mat.mtrl-sci)
subject: FOS: Physical sciences

description: Selective area growth of GaN nanostructures has been performed on full 2" c-sapphire substrates using Si3N4 mask patterned by nanoimprint lithography (array of 400 nm diameter circular holes). A new process has been developed to improve the homogeneity of the nucleation selectivity of c-oriented hexagonal prismatic nanostructures at high temperature (1040\circ C). It consists of an initial GaN nucleation step at 950 \circ C followed by ammonia annealing before high temperature growth. Structural analyses show that GaN nanostructures are grown in epitaxy with c-sapphire with lateral overgrowths on the mask. Strain and dislocations are observed at the interface due to the large GaN/sapphire lattice mismatch in contrast with the high quality of the relaxed crystals in the lateral overgrowth area. A cathodoluminescence study as a function of the GaN nanostructure size confirms these observations: the lateral overgrowth of GaN nanostructures has a low defect density and exhibits a stronger near band edge (NBE) emission than the crystal in direct epitaxy with sapphire. The shift of the NBE positions versus nanostructure size can be mainly attributed to a combination of compressive strain and silicon doping coming from surface mask diffusion.
Muon capture on light nuclei
Creators: name: Marcucci, L. E.
name: Piarulli, M.
Publisher: name: arXiv
Year: 2010
Subjects: subject: Nuclear Theory (nucl-th)
subject: FOS: Physical sciences

description: This work investigates the muon capture reactions 2H(μ^-,ν_μ)nn and 3He(μ^-,ν_μ)3H and the contribution to their total capture rates arising from the axial two-body currents obtained imposing the partially-conserved-axial-current (PCAC) hypothesis. The initial and final A=2 and 3 nuclear wave functions are obtained from the Argonne v_{18} two-nucleon potential, in combination with the Urbana IX three-nucleon potential in the case of A=3. The weak current consists of vector and axial components derived in chiral effective field theory. The low-energy constant entering the vector (axial) component is determined by reproducting the isovector combination of the trinucleon magnetic moment (Gamow-Teller matrix element of tritium beta-decay). The total capture rates are 393.1(8) s^{-1} for A=2 and 1488(9) s^{-1} for A=3, where the uncertainties arise from the adopted fitting procedure.
description: 6 pages, submitted to Few-Body Syst
Scuola Odori 2021 - Atti
Creators: name: cipriano, domenico
name: Cefalì, Amedeo Manuel
name: Andretta, Massimo
name: bonasoni, paolo
name: Ravina, Marco
name: Borghesi, Roberto
name: Mauro, Francesca
name: Capelli, Laura
name: Sironi, Selena
name: Bax, Carmen
name: Polvara, Elisa
name: Tagliaferri, Francesca
name: Invernizzi, Marzio
name: Massera, Ettore
name: De Vito, Saverio
name: Spinazzè, Andrea
name: Cattaneo, Andrea
name: Cavallo, Domenico Maria
Publisher: name: figshare
Year: 2022
Subjects: subject: 50206 Environmental Monitoring
subject: FOS: Earth and related environmental sciences

description: Atti della scuola odori 2021
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title: ÑÑÐµÐ±Ð½Ð¾Ðµ Ð¿Ð¾ÑÐ¾Ð±Ð¸Ðµ
titleType: Subtitle
Creators: name: ÐÑÐ¸ÑÐ»Ð¸Ð½, ÐÐ¾Ð½ÑÑÐ°Ð½ÑÐ¸Ð½
Publisher: name: Ð¡Ð°Ð½ÐºÑ-ÐÐµÑÐµÑÐ±ÑÑÐ³ÑÐºÐ¸Ð¹ Ð¿Ð¾Ð»Ð¸ÑÐµÑÐ½Ð¸ÑÐµÑÐºÐ¸Ð¹ ÑÐ½Ð¸Ð²ÐµÑÑÐ¸ÑÐµÑ ÐÐµÑÑÐ° ÐÐµÐ»Ð¸ÐºÐ¾Ð³Ð¾
Year: 2025
Subjects: ÐÑÐµÐ½Ð°Ð¶

description: ÐÑÐ½Ð¾Ð²Ð½Ð¾Ðµ Ð²Ð½Ð¸Ð¼Ð°Ð½Ð¸Ðµ ÑÐ´ÐµÐ»ÐµÐ½Ð¾ ÑÑÐµÐ¼Ð°Ð¼ Ð´ÑÐµÐ½Ð°Ð¶Ð½ÑÑ ÑÐ¸ÑÑÐµÐ¼ (ÐºÐ¾Ð»ÑÑÐµÐ²Ð¾Ð¹, Ð¿ÑÐ¸ÑÑÐµÐ½Ð½ÑÐ¹, Ð¿Ð»Ð°ÑÑÐ¾Ð²ÑÐ¹, ÑÐ¾Ð¿ÑÑÑÑÐ²ÑÑÑÐ¸Ð¹, Ð³Ð¾Ð»Ð¾Ð²Ð½Ð¾Ð¹, Ð±ÐµÑÐµÐ³Ð¾Ð²Ð¾Ð¹, Ð»ÑÑÐµÐ²Ð¾Ð¹ Ð¸ ÑÐ¸ÑÑÐµÐ¼Ð°ÑÐ¸ÑÐµÑÐºÐ¸Ð¹ Ð´ÑÐµÐ½Ð°Ð¶), Ð° ÑÐ°ÐºÐ¶Ðµ ÐºÐ¾Ð½ÑÑÑÑÐºÑÐ¸ÑÐ¼ Ð´ÑÐµÐ½ Ð¸ ÑÐ¾Ð¾ÑÑÐ¶ÐµÐ½Ð¸Ð¹, Ð²ÑÐ¾Ð´ÑÑÐ¸Ñ Ð² Ð¸Ñ ÑÐ¾ÑÑÐ°Ð². Ð Ð°ÑÑÐ¼Ð¾ÑÑÐµÐ½Ñ Ð¿ÑÐ¸ÑÐ¸Ð½Ñ Ð¿Ð¾Ð´ÑÐ¾Ð¿Ð»ÐµÐ½Ð¸Ñ ÑÐµÑÑÐ¸ÑÐ¾ÑÐ¸Ð¹, Ð¼ÐµÑÐ¾Ð´Ñ Ð·Ð°ÑÐ¸ÑÑ Ð¾Ñ Ð¿Ð¾Ð´ÑÐ¾Ð¿Ð»ÐµÐ½Ð¸Ñ, ÑÐ¿Ð¾ÑÐ¾Ð±Ñ Ð³Ð¸Ð´ÑÐ¾Ð³ÐµÐ¾Ð»Ð¾Ð³Ð¸ÑÐµÑÐºÐ¸Ñ ÑÐ°ÑÑÐµÑÐ¾Ð² Ð´ÑÐµÐ½Ð°Ð¶Ð½ÑÑ ÑÐ¸ÑÑÐµÐ¼.
Pseudagrion hypermelas Selys.
Creators: name: Lieftinck, M. A.
Publisher: name: Zenodo
Year: 1935
Subjects: Biodiversity
Taxonomy
Animalia
Arthropoda
Insecta
Odonata
Coenagrionidae
Pseudagrion
Pseudagrion hypermelas

description: 62. Pseudagrion hypermelas Selys. - Eastcoast Gvt.: Mt. Sinaboeng. ♂ (Kruger). Like the foregoing species. the occurrence is Sumatra is uncertain.
description: Published as part of Lieftinck, M. A., 1935, A Synopsis of the Odonata (Dragonflies) of Sumatra, pp. 1-23 in Miscellanea Zoologica Sumatrana 1 on page 11, DOI: 10.5281/zenodo.3251875
description: {"references": ["Kruger. L. Die Odonaten von Sumatra. I ~ III. Stett. ent. Zeitg. 59 - 63. 1898 - 1902."]}
Understanding the Influence of Stereochemistry on the Passive Membrane Permeability of Semi-Peptidic Macrocycles
Creators: name: Ries, Benjamin
name: Stadelmann, Thomas
name: Prof. Dr. Sereina Riniker
name: Comeau, Christian
name: Prof. Dr. Éric Marsault
Publisher: name: Zenodo
Year: 2020
Subjects: Peptides
Molecular Dynamics
Cyclic-Peptides

description: In this flash talk at GCC 2020, we briefly summarize one project of our group investigating the effect of a wandering methyl group and changing the stereo-center generated by this group.
Pseudagnon microcephalum Ramb.
Creators: name: Lieftinck, M. A.
Publisher: name: Zenodo
Year: 1935
Subjects: Biodiversity
Taxonomy
Animalia
Arthropoda
Insecta
Odonata
Calopterygidae
Pseudagnon
Pseudagnon microcephalum

description: 63. Pseudagnon microcephalum (Ramb.). - Probably widely distributed. I have seen specimens from Takengon (Atjeh). and Benkoelen. It is a very common insect on lake Anaklaoet on Poeloe Weh (Sabang). N. extremity of Sumatra. where Mr. Drescher and I took a fair series.
description: Published as part of Lieftinck, M. A., 1935, A Synopsis of the Odonata (Dragonflies) of Sumatra, pp. 1-23 in Miscellanea Zoologica Sumatrana 1 on page 11, DOI: 10.5281/zenodo.3251875
title: Electron tunneling to the surface states at photocatalysis
Creators: name: Sidorova, T.N.
name: Danilyuk, Alexander L.
Publisher: name: Peter the Great St. Petersburg Polytechnic University
Year: 2019
Subjects: phase function method
TiO2/Si nanostructure
transmission
tunneling electron

description: Simulation of tunneling electrons excited by the sunlight in TiO2 to surface states is performed for TiO2/Si nanostructure. The tunneling transmission coefficient of the surface states created by organic compounds was calculated by phase function method. Dependence of the transmission coefficient of tunneling electrons on potential barrier parameters is explained by interference of transmitted and reflected waves. doi: 10.18720/MPM.4112019_3
Analytic classification of singularities in the generalized Kowalevski case
Creators: name: Ryabov, P. E.
name: Kharlamov, M. P.
Publisher: name: arXiv
Year: 2010
Subjects: subject: Exactly Solvable and Integrable Systems (nlin.SI)
subject: Dynamical Systems (math.DS)
subject: Symplectic Geometry (math.SG)
subject: FOS: Physical sciences
subject: FOS: Mathematics
subject: 70E17, 70G40

description: In the problem of motion of the Kowalevski top on two constant fields (the A.G.Reyman - M.A.Semenov-Tian-Shansky case) the type of all critical points of the momentum map is calculated.
description: LaTex, 10 pages
Mechanism of Laser-induced Field Emission
Creators: name: Yanagisawa, Hirofumi
name: Hengsberger, Matthias
name: Leuenberger, Dominik
name: Klöckner, Martin
name: Hafner, Christian
name: Greber, Thomas
name: Osterwalder, Jürg
Publisher: name: arXiv
Year: 2011
Subjects: subject: Mesoscale and Nanoscale Physics (cond-mat.mes-hall)
subject: FOS: Physical sciences

description: We have measured electron energy distribution curves (EDCs) of the laser-induced field emission from a tungsten tip. Field emission from photo-excited nonequilibrium electron distributions were clearly observed, while no enhanced field emission due to optical electric fields appeared up to values of 1.3 V/nm. Thus, we experimentally confirm the emission mechanism. Simulated transient EDCs show that electron dynamics plays a significant role in the laser-induced field emission. The results should be useful to find optimal parameters for defining the temporal and spectral characteristics of electron pulses for many applications based on pulsed field emission.
description: 4 pages 4 figures 1 table, submitted to Physical Review Letters
MOCVD growth mechanisms of ZnO nanorods
Creators: name: Perillat-Merceroz, Guillaume
name: Jouneau, Pierre-Henri
name: Feuillet, Guy
name: Thierry, Robin
name: Rosina, Milan
name: Ferret, Pierre
Publisher: name: arXiv
Year: 2011
Subjects: subject: Materials Science (cond-mat.mtrl-sci)
subject: FOS: Physical sciences

description: ZnO is a promising material for the fabrication of light emitting devices. One approach to achieve this goal is to use ZnO nanorods because of their expected high crystalline and optical quality. Catalyst free growth of nanorods by metalorganic chemical vapour deposition (MOCVD) was carried out on (0001) sapphire substrates. Arrays of well-aligned, vertical nanorods were obtained with uniform lengths and diameters. A thin wetting layer in epitaxy with the sapphire substrate is formed first, followed by pyramids and nanorods. The nucleation of nanorods occurs either directly at the interface, or later on top of some of the pyramids, suggesting various nucleation mechanisms. It is shown that crystal polarity plays a critical role in the growth mechanism with nanorods of Zn polarity and their surrounding pyramids with O polarity. A growth mechanism is proposed to explain that most threading dislocations lie in the wetting layer, with only a few in the pyramids and none in the nanorods.
Pseudagrion pruinosum subsp. ranauense Schmidt
Creators: name: Lieftinck, M. A.
Publisher: name: Zenodo
Year: 1935
Subjects: Biodiversity
Taxonomy
Animalia
Arthropoda
Insecta
Odonata
Coenagrionidae
Pseudagrion
Pseudagrion pruinosum
Pseudagrion pruinosum ranauense schmidt

description: 64a. Pseudagrion pruinosum ranauense Schmidt (= P. p. fraseri Schmidt). - Atjeh Gvt.: Takengon. 1200 m. van Steenis leg. Eastcoast Gvt.: Deli. Soekaranda (Kruger); Medan. van der Meer Mohr leg. Tapanoeli Res.: Lake Toba distr. (Schmidt). Westcoast Res.: Moearalaboeh; Solok (Albarda); Pajakoemboeh. Kloof van Harau (Fraser); Padangsche Bovenlanden (Ris); Korintji (Campion); Lake Singkarak (Schmidt). Benkoelen Res.:: Lake Ranau distr. Banding Agoeng. van Steenis leg.; Lake Ranau. Muller leg.; same loc. (Schmidt). - Although very closely allied to typical pruinosum the name of this subspecies may be retained for specimens in which the pale occipital markings are greatly reduced. These markings are variable to some extent. some of the Medan specimens being not different from those of Benkoelen.
description: Published as part of Lieftinck, M. A., 1935, A Synopsis of the Odonata (Dragonflies) of Sumatra, pp. 1-23 in Miscellanea Zoologica Sumatrana 1 on page 11, DOI: 10.5281/zenodo.3251875
description: {"references": ["Schmidt, E. Odonatader Deutschen Iimnologischen Sunda-Expedition. Arch. Hydrobiol. Suppl. 13, Bd. 5. 1934.", "Kruger. L. Die Odonaten von Sumatra. I ~ III. Stett. ent. Zeitg. 59 - 63. 1898 - 1902.", "Albarda. H .. in Veth's Midden Sumatra. Nat. Hist. Afd. 5. Neuroptera, 1881.", "Ris. F. Odonaten von Sumatra, gesammelt von Edward Jacobson. Zool. Meded. Leiden. 10. 1927.", "Campion. H. Odonata, collected in Korinclii. West Sumatra. J. Fed. Mal. States Mus .. 8. 1925."]}
Searching for inhibitors of the protein arginine methyl transferases : synthesis and characterisation of peptidomimetic ligands
Creators: name: Knuhtsen, Astrid
Publisher: name: University of British Columbia
Year: 2016

description: Within the last two decades research in the field of epigenetics has increased significantly as targeting the epigenetic enzymes has the potential to alter the transcription of genes. Aberrant regulation of transcription is seen in several disease states, and drugs targeting the epigenetic histone deacetylases and DNA methylases are already marketed for cancer treatment. The Protein Arginine Methyl Transferases (PRMTs) belong to an epigenetic enzyme family that is upregulated in several cancers. However, currently no inhibitors of the PRMTs have been marketed. In this thesis several peptidomimetic strategies were utilised to modify the tryptophan residues in two peptide leads in order to discover new inhibitors of the PRMTs. One of these strategies involved constraining the side chain indole of tryptophan to the peptide backbone, thus producing a seven membered azepinone mimetic, Aia. The peptidomimetic efforts resulted in a structure-activity relationship study from which a constrained peptidomimetic containing two Aias was discovered to be a low micromolar inhibitor of several PRMTs. To characterise the inhibitor the conformation of the inhibitor was examined using solution-phase NMR and was shown to display an interesting turn-structure. The original peptide lead was fluorescently tagged and investigated in a cellular setting, but did not reveal any PRMT-specific localisation. In an effort to study the binding of the discovered inhibitor with the PRMTs, protein expression in E. coli and purification was performed. This resulted in the optimisation of PRMT6 purification in order to obtain highly pure PRMT6 for isothermal titration calorimetry (ITC) studies. Unfortunately these ITC studies were unsuccessful. Furthermore, as the constrained tryptophan mimetic had proven very useful in the peptidomimetic inhibitors of the PRMTs, we attempted to synthesise a lysine/arginine dipeptide mimetic using aziridine chemistry.
Pseudagrion pruinosum subsp. pruinosum Ramb.
Creators: name: Lieftinck, M. A.
Publisher: name: Zenodo
Year: 1935
Subjects: Biodiversity
Taxonomy
Animalia
Arthropoda
Insecta
Odonata
Coenagrionidae
Pseudagrion
Pseudagrion pruinosum
Pseudagrion pruinosum pruinosum (ramb.)

description: 64b. Pseudagrion pruinosum pruinosum (Ramb.). - S. Lampoeng Res.: common everywhere in the hill-country between Telokbetoeng and Kotaagoeng. from near sea-level upwards to about 600 m. Not different from Javan pruinosum (Lieftinck).
description: Published as part of Lieftinck, M. A., 1935, A Synopsis of the Odonata (Dragonflies) of Sumatra, pp. 1-23 in Miscellanea Zoologica Sumatrana 1 on page 11, DOI: 10.5281/zenodo.3251875
description: {"references": ["Lieftinck. M. A. Dragonflies (Odonata) from Northeast Sumatra. Misc. Zool. Sum. 34. 1929."]}
Formation of Cosmic Crystals in Highly-Supersaturated Silicate Vapor Produced by Planetesimal Bow Shocks
Creators: name: Miura, H.
name: Tanaka, K. K.
name: Yamamoto, T.
name: Nakamoto, T.
name: Yamada, J.
name: Tsukamoto, K.
name: Nozawa, J.
Publisher: name: arXiv
Year: 2010
Subjects: subject: Earth and Planetary Astrophysics (astro-ph.EP)
subject: FOS: Physical sciences

description: Several lines of evidence suggest that fine silicate crystals observed in primitive meteorite and interplanetary dust particles (IDPs) nucleated in a supersaturated silicate vapor followed by crystalline growth. We investigated evaporation of $μ$m-sized silicate particles heated by a bow shock produced by a planetesimal orbiting in the gas in the early solar nebula and condensation of crystalline silicate from the vapor thus produced. Our numerical simulation of shock-wave heating showed that these μm-sized particles evaporated almost completely when the bow shock is strong enough to cause melting of chondrule precursor dust particles. We found that the silicate vapor cools very rapidly with expansion into the ambient unshocked nebular region; the cooling rate is estimated, for instance, to be as high as 2000 K s$^{-1}$ for a vapor heated by a bow shock associated with a planetesimal of radius 1 km. The rapid cooling of the vapor leads to nonequilibrium gas-phase condensation of dust at temperatures much lower than those expected from the equilibrium condensation. It was found that the condensation temperatures are lower by a few hundred K or more than the equilibrium temperatures. This explains the results of the recent experimental studies of condensation from a silicate vapor that condensation in such large supercooling reproduces morphologies similar to those of silicate crystals found in meteorites. Our results suggest strongly that the planetesimal bow shock is one of the plausible sites for formation of not only chondrules but also other cosmic crystals in the early solar system.
description: 34 pages, 10 figures, Accepted for publication in ApJ
Laudal's Lemma in positive characteristic
Creators: name: Bonacini, Paola
Publisher: name: arXiv
Year: 2010
Subjects: subject: Algebraic Geometry (math.AG)
subject: FOS: Mathematics
subject: 14H50

description: Laudal's Lemma states that if $C$ is a curve of degree $d > s^2 + 1$ in $\mathbb P^3$ over an algebraically closed field of characteristic 0 such that its plane section is contained in an irreducible curve of degree s, then $C$ lies on a surface of degree $s$. We show that the same result does not hold in positive characteristic and we find different bounds $d > f(s)$ which ensure that $C$ is contained in a surface of degree $s$.
Pseudagrion rubriceps Selys.
Creators: name: Lieftinck, M. A.
Publisher: name: Zenodo
Year: 1935
Subjects: Biodiversity
Taxonomy
Animalia
Arthropoda
Insecta
Odonata
Coenagrionidae
Pseudagrion
Pseudagrion rubriceps

description: *65. Pseudagrion rubriceps Selys. - Atjeh Gvt.: 1 ♂. Takengon. 1200 m. Aug. 1934. van Steenis leg.
description: Published as part of Lieftinck, M. A., 1935, A Synopsis of the Odonata (Dragonflies) of Sumatra, pp. 1-23 in Miscellanea Zoologica Sumatrana 1 on page 11, DOI: 10.5281/zenodo.3251875
Kinetics and fate of natural organic matter under different water matrices using strong basic ion exchange resins
Creators: name: Bazri, Mohammad Mahdi
Publisher: name: University of British Columbia
Year: 2016

description: This research has investigated the factors influencing the kinetics and efficacy of natural organic matter (NOM) removal during the anionic ion exchange process (IEX). A holistic approach was undertaken to evaluate various IEX resins in terms of their NOM removal kinetics and regeneration efficiency under batch and consecutive multiple loading cycles. Initial screenings indicated the strongly basic resin as a better candidate for NOM removal, and hence it was employed for subsequent experiments. Different treatment parameters (resin dose, contact time, NOM source) were tested and detailed kinetic evaluations were conducted to determine the affinity and removal rate of NOM as well as nitrate, and sulfate that are generally present in natural waters. Results obtained showed a substantial removal of NOM (up to 80 %) and nitrate (up to 80 %), and a superior removal for sulfate (up to 98 %). Charge density and molecular weight were found to play a major role in the removal process. Different mathematical and physical models were employed to predict the experimental data and the rate-limiting step was found to be pore diffusion which was affected by the resin dose/solute concentrations ratio. Moreover, the impact of IEX resins on NOM fractions and subsequent water quality parameters was investigated in this study. Humic (-like) substances were mainly targeted by IEX, and more hydrophilic and/or non-ionic fractions were slightly removed. Application of IEX reduced the formation potential of carbonaceous and nitrogenous disinfection by-products by 13-20 % and 3-50 %, respectively. Also, the practice of IEX treatment reduced the assimilable organic carbon levels by 30-40 %. Additionally, a positive effect of IEX, as a pretreatment to UV/H₂O₂, at reducing the ⦁OH scavenging characteristics of the water was observed. Electrical energy per order for removing a probe compound (i.e., pCBA) showed 20-40 % reduction indicating the improvement in the efficacy of UV/H₂O₂ treatment. Findings of this study display the robustness of IEX process for drinking water applications and lay down a quantitative approach for evaluating the kinetics of this process under various treatment conditions.
Argiocnemis rubescens Selys.
Creators: name: Lieftinck, M. A.
Publisher: name: Zenodo
Year: 1935
Subjects: Biodiversity
Taxonomy
Animalia
Arthropoda
Insecta
Odonata
Coenagrionidae
Argiocnemis
Argiocnemis rubescens

description: 66. Argiocnemis rubescens Selys. - Eastcoast Gvt.: Deli. Soekaranda (Kruger). Westcoast Res.: Mt. Ophir distr.; Padangsche Bovenlanden (Ris). Palembang Res.: Palembang. G. Wolber leg. (Mus Hamburg). Benkoelen Res.: Lake Ranau (Schmidt). S. Lampoeng Res.: Telokbetoeng. sea-level. and Talangpadang. 150 m. Drescher leg.; Mt. Tanggamoes. Gisting and environs. 3-600 m. rather rare. Author leg.
description: Published as part of Lieftinck, M. A., 1935, A Synopsis of the Odonata (Dragonflies) of Sumatra, pp. 1-23 in Miscellanea Zoologica Sumatrana 1 on page 11, DOI: 10.5281/zenodo.3251875
description: {"references": ["Kruger. L. Die Odonaten von Sumatra. I ~ III. Stett. ent. Zeitg. 59 - 63. 1898 - 1902.", "Ris. F. Odonaten von Sumatra, gesammelt von Edward Jacobson. Zool. Meded. Leiden. 10. 1927.", "Schmidt, E. Odonatader Deutschen Iimnologischen Sunda-Expedition. Arch. Hydrobiol. Suppl. 13, Bd. 5. 1934."]}
The Combinatorial Geometry of Q-Gorenstein Quasi-Homogeneous Surface Singularities
Creators: name: Pratoussevitch, Anna
Publisher: name: arXiv
Year: 2010
Subjects: subject: Differential Geometry (math.DG)
subject: FOS: Mathematics
subject: Primary 53C50, Secondary 14J17, 32S25, 51M20, 52B10

description: The main result of this paper is a construction of fundamental domains for certain group actions on Lorentz manifolds of constant curvature. We consider the simply connected Lie group G~, the universal cover of the group SU(1,1) of orientation-preserving isometries of the hyperbolic plane. The Killing form on the Lie group G~ gives rise to a bi-invariant Lorentz metric of constant curvature. We consider a discrete subgroup Gamma_1 and a cyclic discrete subgroup Gamma_2 in G~ which satisfy certain conditions. We describe the Lorentz space form Gamma_1\G~/Gamma_2 by constructing a fundamental domain for the action of the product of Gamma_1 and Gamma_2 on G~ by (g,h)*x=gxh^{-1}. This fundamental domain is a polyhedron in the Lorentz manifold G~ with totally geodesic faces. For a co-compact subgroup the corresponding fundamental domain is compact. The class of subgroups for which we construct fundamental domains corresponds to an interesting class of singularities. The bi-quotients of the form Gamma_1\G~/Gamma_2 are diffeomorphic to the links of quasi-homogeneous Q-Gorenstein surface singularities.
Mortonagrion amoenum Ris
Creators: name: Lieftinck, M. A.
Publisher: name: Zenodo
Year: 1935
Subjects: Biodiversity
Taxonomy
Animalia
Arthropoda
Insecta
Odonata
Coenagrionidae
Mortonagrion
Mortonagrion amoenum

description: *67. Mortonagrion amoenum (Ris). - S. Lampoeng Res.: 1 ♂. Telokbetoeng. Oosthaven. sea-level. June 3, 1939, Drescher leg. Of this species I have also received a few specimens from W. Borneo.
description: Published as part of Lieftinck, M. A., 1935, A Synopsis of the Odonata (Dragonflies) of Sumatra, pp. 1-23 in Miscellanea Zoologica Sumatrana 1 on page 12, DOI: 10.5281/zenodo.3251875
Design and analysis of continuous hybrid differentiator
Creators: name: Wang, Xinhua
name: Lin, Hai
Publisher: name: arXiv
Year: 2011
Subjects: subject: Systems and Control (eess.SY)
subject: Dynamical Systems (math.DS)
subject: Optimization and Control (math.OC)
subject: FOS: Electrical engineering, electronic engineering, information engineering
subject: FOS: Mathematics

description: In this paper, a continuous hybrid differentiator is presented based on a strong Lyapunov function. The differentiator design can not only reduce sufficiently chattering phenomenon of derivative estimation by introducing a perturbation parameter, but also the dynamical performances are improved by adding linear correction terms to the nonlinear ones. Moreover, strong robustness ability is obtained by integrating sliding mode items and the linear filter. Frequency analysis is applied to compare the hybrid continuous differentiator with sliding mode differentiator. The merits of the continuous hybrid differentiator include the excellent dynamical performances, restraining noises sufficiently, and avoiding the chattering phenomenon.
Supplementary Materials for: Phylogenomics and historical biogeography of Hydrangeeae (Hydrangeaceae) elucidate the effects of geologic and climatic dynamics on diversification
Creators: name: Yang, Xudong
name: Zhang, Xu
name: Xue, Tiantian
name: Zhang, Xiaoxia
name: Yang, Fusheng
name: Yu, Jianghong
name: Janssens, Steven B.
name: Bussmann, Rainer W.
name: Yu, Shengxiang
Publisher: name: The Royal Society
Year: 2023

description: Figures S1-S15. Tables S1-S17.
Mortonagrion simile Ris.
Creators: name: Lieftinck, M. A.
Publisher: name: Zenodo
Year: 1935
Subjects: Biodiversity
Taxonomy
Animalia
Arthropoda
Insecta
Odonata
Coenagrionidae
Mortonagrion
Mortonagrion simile

description: 68. Mortonagrion simile Ris. - Eastcoast Gvt.: Deli. Medan & Boeloetjina (Ris). S. Lampoeng Res.: Mt. Tanggamoes. Gisting. 500 m. Waiberah. Dec 28-30, 1934.3 ♂. 2 ♀. Author leg. Occurs also in W. Borneo. but evidently is a rare species.
description: Published as part of Lieftinck, M. A., 1935, A Synopsis of the Odonata (Dragonflies) of Sumatra, pp. 1-23 in Miscellanea Zoologica Sumatrana 1 on page 12, DOI: 10.5281/zenodo.3251875
description: {"references": ["Ris. F. Odonaten von Sumatra, gesammelt von Edward Jacobson. Zool. Meded. Leiden. 10. 1927."]}
Tracking an open quantum system using a finite state machine: stability analysis
Creators: name: Karasik, Raisa I.
name: Wiseman, Howard M.
Publisher: name: arXiv
Year: 2011
Subjects: subject: Quantum Physics (quant-ph)
subject: FOS: Physical sciences

description: A finite-dimensional Markovian open quantum system will undergo quantum jumps between pure states, if we can monitor the bath to which it is coupled with sufficient precision. In general these jumps, plus the between-jump evolution, create a trajectory which passes through infinitely many different pure states, even for ergodic systems. However, as shown recently by us [Phys. Rev. Lett. \textbf{106}, 020406 (2011)], it is possible to construct {\em adaptive} monitorings which restrict the system to jumping between a finite number of states. That is, it is possible to track the system using a {\em finite state machine} as the apparatus. In this paper we consider the question of the stability of these monitoring schemes. Restricting to cyclic jumps for a qubit, we give a strong analytical argument that these schemes are always stable, and supporting analytical and numerical evidence for the example of resonance fluorescence. This example also enables us to explore a range of behaviors in the evolution of individual trajectories, for several different monitoring schemes.
Giant Quantum Freezing of Tunnel Junctions mediated by Environments
Creators: name: Glatz, A.
name: Chtchelkachev, N. M.
name: Beloborodov, I. S.
name: Vinokur, V.
Publisher: name: arXiv
Year: 2011
Subjects: subject: Mesoscale and Nanoscale Physics (cond-mat.mes-hall)
subject: Strongly Correlated Electrons (cond-mat.str-el)
subject: FOS: Physical sciences

description: We investigate the quantum heat exchange between a nanojunction and a many-body or electromagnetic environment far from equilibrium. It is shown that the two-temperature energy emission-absorption mechanism gives rise to a giant heat flow between the junction and the environment. We obtain analytical results for the heat flow in an idealized high impedance environment and perform numerical calculations for the general case of interacting electrons and discuss the giant freezing and heating effects in the junction under typical experimental conditions.
description: 4 pages, 4 figures; supplementary material included as additional pdf-file; http://link.aps.org/doi/10.1103/PhysRevB.84.235101
Ischnura senegalensis Ramb.
Creators: name: Lieftinck, M. A.
Publisher: name: Zenodo
Year: 1935
Subjects: Biodiversity
Taxonomy
Animalia
Arthropoda
Insecta
Odonata
Coenagrionidae
Ischnura
Ischnura senegalensis

description: 69. Ischnura senegalensis (Ramb.) - Common everywhere. I have also specimens from Poeloe Weh (Sabang).
description: Published as part of Lieftinck, M. A., 1935, A Synopsis of the Odonata (Dragonflies) of Sumatra, pp. 1-23 in Miscellanea Zoologica Sumatrana 1 on page 12, DOI: 10.5281/zenodo.3251875
Quantum phase transition in a gapped Anderson model: A numerical renormalization group study
Creators: name: Moca, Catalin Pascu
name: Roman, Adrian
Publisher: name: arXiv
Year: 2010
Subjects: subject: Mesoscale and Nanoscale Physics (cond-mat.mes-hall)
subject: FOS: Physical sciences

description: We use the numerical renormalization group method to investigate the spectral properties of a single-impurity Anderson model with a gap δ across the Fermi level in the conduction-electron spectrum. For any finite δ > 0, at half filling the ground state of the system is always a doublet. Away from half filling a quantum phase transition (QPT) occurs as function of the gap value δ, and the system evolves from the strong-coupling (SC) Kondo-type state, corresponding to δ δ_C. The opening of the gap leads to the formation of one (two) bound states when the system is in the SC (LM) regime. The evolution across the QPT of their positions and the corresponding weights together with the dynamic properties of the model are investigated.
description: 6 pages, 6 eps figures
DNF Sampling for ProbLog Inference
Creators: name: Shterionov, Dimitar Sht.
name: Kimmig, Angelika
name: Mantadelis, Theofrastos
name: Janssens, Gerda
Publisher: name: arXiv
Year: 2010
Subjects: subject: Logic in Computer Science (cs.LO)
subject: FOS: Computer and information sciences

description: Inference in probabilistic logic languages such as ProbLog, an extension of Prolog with probabilistic facts, is often based on a reduction to a propositional formula in DNF. Calculating the probability of such a formula involves the disjoint-sum-problem, which is computationally hard. In this work we introduce a new approximation method for ProbLog inference which exploits the DNF to focus sampling. While this DNF sampling technique has been applied to a variety of tasks before, to the best of our knowledge it has not been used for inference in probabilistic logic systems. The paper also presents an experimental comparison with another sampling based inference method previously introduced for ProbLog.
description: Online proceedings of the Joint Workshop on Implementation of Constraint Logic Programming Systems and Logic-based Methods in Programming Environments (CICLOPS-WLPE 2010), Edinburgh, Scotland, U.K., July 15, 2010
Agriocnemis femina Brauer
Creators: name: Lieftinck, M. A.
Publisher: name: Zenodo
Year: 1935
Subjects: Biodiversity
Taxonomy
Animalia
Arthropoda
Insecta
Odonata
Coenagrionidae
Agriocnemis
Agriocnemis femina

description: 70. Agriocnemis femina (Brauer). - Also a very common species.
description: Published as part of Lieftinck, M. A., 1935, A Synopsis of the Odonata (Dragonflies) of Sumatra, pp. 1-23 in Miscellanea Zoologica Sumatrana 1 on page 12, DOI: 10.5281/zenodo.3251875
Graphene valley filter using a line defect
Creators: name: Gunlycke, Daniel
name: White, Carter T.
Publisher: name: arXiv
Year: 2011
Subjects: subject: Mesoscale and Nanoscale Physics (cond-mat.mes-hall)
subject: FOS: Physical sciences

description: With its two degenerate valleys at the Fermi level, the band structure of graphene provides the opportunity to develop unconventional electronic applications. Herein, we show that electron and hole quasiparticles in graphene can be filtered according to which valley they occupy without the need to introduce confinement. The proposed valley filter is based on scattering off a recently observed line defect in graphene. Quantum transport calculations show that the line defect is semitransparent and that quasiparticles arriving at the line defect with a high angle of incidence are transmitted with a valley polarization near 100%.
description: 5 pages, 4 figures