cometadata/datacite-rtg-text-other-reclassification-records huggingface dataset:
New holographic Chaplygin gas model of dark energy
Creators: name: Malekjani, M.
name: Khodam-Mohammadi, A.
Publisher: name: arXiv
Year: 2010
Subjects: subject: General Relativity and Quantum Cosmology (gr-qc)
subject: FOS: Physical sciences

description: In this work, we investigate the holographic dark energy model with new infrared cut-off (new HDE model) proposed by Granda and Oliveros. Using this new definition for infrared cut-off, we establish the correspondence between new HDE model and standard Chaplygin gas (SCG), generalized Chaplygin gas (GCG) and modified Chaplygin gas (MCG) scalar field models in non-flat universe. The potential and dynamics for these scalar field models, which describe the accelerated expansion of the universe are reconstructed. According to the evolutionary behavior of new HDE model, we derive the same form of dynamics and potential for different SCG, GCG and MCG models. We also calculate the squared sound speed of new HDE model as well as for SCG, GCG and MCG models and investigate the new HDE Chaplygin gas models from the viewpoint of linear perturbation theory. All results in non-flat universe are also discussed in the limiting case of flat universe, i.e. $k=0$.
description: 19 pages, Accepted by Int. J. Mod. Phys. D
Phase diagram of one-dimensional Hubbard-Holstein model at quarter-filling
Creators: name: Reja, Sahinur
name: Yarlagadda, Sudhakar
name: Littlewood, Peter B.
Publisher: name: arXiv
Year: 2010
Subjects: subject: Strongly Correlated Electrons (cond-mat.str-el)
subject: Superconductivity (cond-mat.supr-con)
subject: FOS: Physical sciences

description: We derive an effective Hamiltonian for the one-dimensional Hubbard-Holstein model, valid in a regime of both strong electron-electron (e-e) and electron-phonon (e-ph) interactions and in the non-adiabatic limit ($t/ω_0 \leq 1$), by using a non-perturbative approach. We obtain the phase diagram at quarter-filling by employing a modified Lanczos method and studying various density-density correlations. The spin-spin AF (antiferromagnetic) interactions and nearest-neighbor repulsion, resulting from the e-e and the e-ph interactions respectively, are the dominant terms (compared to hopping) and compete to determine the various correlated phases. As e-e interaction $(U/t)$ is increased, the system transits from an AF cluster to a correlated singlet phase through a discontinuous transition at all strong e-ph couplings $2 \leq g \leq 3$ considered. At higher values of $U/t$ and moderately strong e-ph interactions ($2 \leq g \leq 2.6$), the singlets break up to form an AF order and then to a paramagnetic order all in a single sublattice; whereas at larger values of $g$ ($> 2.6$), the system jumps directly to the spin disordered charge-density-wave (CDW) phase.
description: Added two figures for clarity
title: Διερεύνηση τεχνικών παραμέτρων εγκατάστασης αιολικών πάρκων σε τρεις ελληνικές πόλεις
Creators: name: Χουλιαρας Αριστειδης
Publisher: name: Technical University of Crete
Year: 2021

description: Η παρούσα διπλωματική εργασία έχει ως αντικείμενο την εισαγωγή στην
αιολική ενέργεια και την τεχνική προμελέτη εγκατάστασης αιολικού πάρκου ισχύος 10MW σε 3 πόλεις της Ελλάδας, Χανιά, Πάτρα και Κοζάνη.
Αρχικά, στα πρώτα κεφάλαια γίνεται αναφορά σε βιβλιογραφικά στοιχεία που
αφορούν την αιολική ενέργεια, την τεχνολογία των ανεμογεννητριών, πληροφορίες για το πρόγραμμα RETScreen καθώς και το νομοθετικό πλαίσιο στο οποίο εγκαθίστανται οι ΑΠΕ. Στη συνέχεια γίνεται παρουσίαση των ενεργειών μέσω του προγράμματος RETScreen Expert μέχρι και την παρουσίαση των τελικών αποτελεσμάτων και ο σχολιασμός και τα συμπεράσματα που προέκυψαν από αυτήν τη μελέτη.
Σκοπός της εργασίας είναι η μελέτη της εγκατάστασης ενός αιολικού πάρκου
ισχύος 10MW για 13 διαφορετικούς τύπους ανεμογεννητριών σε αυτές τις περιοχές ώστε να φανεί η πιο αποδοτική λύση όσον αφορά την παραγωγικότητα του πάρκου ανά περιοχή καθώς και μερικές διαφορές της παραγωγικότητας που προκύπτουν αλλάζοντας τον συντελεστή παραμόρφωσης ανέμου στην ίδια περιοχή.
Τέλος, αξίζει να σημειωθεί ότι οι περιοχές που μελετήθηκαν είναι αδειοδοτημένες προς εγκατάσταση καθώς για την επιλογή τους έγινε μελέτη του Γεωγραφικού Χάρτη ΡΑΕ.
Semaphorin 3C in prostate cancer tumourigenesis
Creators: name: Tam, Kevin J.
Publisher: name: University of British Columbia
Year: 2018

description: Prostate cancer (PCa) is among the most commonly-occurring cancers worldwide and a leading cause of cancer-related deaths in men. Local non-invasive PCa is highly treatable but limited treatment options exist for those with locally-advanced and metastatic forms of the disease. This underscores the need to identify mechanisms mediating PCa progression. One well-established driver of PCa progression is the androgen receptor protein whose transcriptional targets include genes related to cell growth and cell cycle progression. Consequently, the androgen receptor axis is the target of many therapies for those with PCa. Another important aspect of disease progression relates to cancer spread or metastasis. Epithelial-to-mesenchymal transition (EMT) is a cellular process executed during embryogenesis and is defined as the transition of cells from an epithelial phenotype to a mesenchymal phenotype. It is suspected that metastasis is, in part, due to inadvertent re-activation of EMT. Another theorized cause of cancer progression is due to the existence of tumour-initiating cells or ‘cancer stem cells’ which resist conventional radiation- and chemotherapies and seed relapse and metastasis. The semaphorins are a large grouping of membrane-associated or s¬ecreted signalling proteins whose normal roles reside in embryogenesis and neuronal development. During these processes the semaphorins establish chemotactic gradients and direct cell movement. Various semaphorin family members have been found to be up- or downregulated in a number of cancers. One family member, semaphorin 3C (SEMA3C), has been implicated in several types of cancer and its increased expression is correlated with PCa stage. Given SEMA3C’s roles in development and its augmented expression in PCa, we hypothesized that SEMA3C promotes cancer progression by driving EMT and stem-like characteristics. In the present study, we show that SEMA3C is a direct transcriptional target of the androgen receptor and further show that ectopic expression of SEMA3C in RWPE-1, a normal prostate epithelial cell line, leads to an upregulation of EMT and stem markers which is accompanied by acquisition of invasiveness and stem-like phenotypes. The broader impact of this work pertains to the clinical implications of SEMA3C’s involvement in PCa and linking SEMA3C and AR to metastatic recurrent PCa.
Ichiyo: Fragile and Transient Interaction in Neighborhood
Creators: name: Shibata, Hirofumi
name: Yogo, Ayako
name: Nishida, Naoto
name: Shimada, Yu
name: Ishii, Toma
Publisher: name: arXiv
Year: 2025
Subjects: subject: Human-Computer Interaction (cs.HC)
subject: Multimedia (cs.MM)
subject: FOS: Computer and information sciences

description: As the Internet develops, social networking and other communication tools have transformed people's relationships into something fast, visible, and geographically huge. However, these communication tools have not expanded opportunities for acquainting oneself with neighbors outside one's social network; rather, they have comparatively diminished occasions for interacting with unfamiliar neighbors by prioritizing communication with existing friends. Therefore, we invented the medium Ichiyo to increase the opportunities to think of neighbors walking along the same street or in the same neighborhood and to expand the imagination of those who pass by and those who used to be there. Thus, users can engage in indirect interaction. We used commercially available laser cutters to engrave QR codes on leaves that are naturally found in our living space to prevent environmental invasion. The QR codes lead to a communal space on the web where users can freely leave messages. By engraving QR codes, information can be virtually expanded to be presented. To get the feedback of Ichiyo, we let a total of several thousand people experience a new way of communication as a part of the exhibition ''iii Exhibition 2022'', an art exhibition at the University of Tokyo. A total of more than 1,000 leaves engraved with QR codes were prepared and scattered at the exhibition site and along the road from the nearest station to the venue.
description: 3 pages, 3 figures
Kaleidoscope of exotic quantum phases in a frustrated XY model
Creators: name: Varney, Christopher N.
name: Sun, Kai
name: Galitski, Victor
name: Rigol, Marcos
Publisher: name: arXiv
Year: 2011
Subjects: subject: Strongly Correlated Electrons (cond-mat.str-el)
subject: Quantum Gases (cond-mat.quant-gas)
subject: FOS: Physical sciences

description: The existence of quantum spin liquids was first conjectured by Pomeranchuk some 70 years ago, who argued that frustration in simple antiferromagnetic theories could result in a Fermi-liquid-like state for spinon excitations. Here we show that a simple quantum spin model on a honeycomb lattice hosts the long sought for Bose metal with a clearly identifiable Bose surface. The complete phase diagram of the model is determined via exact diagonalization and is shown to include four distinct phases separated by three quantum phase transitions.
Meta-analysis of gene expression in mouse models of neurodegenerative disorders
Creators: name: Zhuang, Cuili
Publisher: name: University of British Columbia
Year: 2018

description: There is intense interest in understanding the molecular mechanisms that contribute to neurodegenerative disorders (NDs), which involve complex interplays of genetic and environmental factors. To catch early events involved in disease initiation requires investigation on pre-symptomatic brain samples. It is difficult to capture early molecular events using post-mortem human brain samples since these samples represent the late phase of the disorder with progressive brain damage and neurodegeneration. Disease mouse models are developed to study disease progression and pathophysiology. Here, I focus on two of the most studied NDs: Alzheimer’s disease (AD) and Huntington’s disease (HD). Mouse models developed for the disease (AD or HD) often share similar phenotypes mimicking human disease symptoms, which suggest potential common underlying mechanisms of disease initiation and progression across mouse models of the same disease. Investigation of gene expression profiles of pre-symptomatic animals from different mouse models may shed light on the mechanisms occurred in the early disease phase. Gene expression profiling analyses have been performed on mouse models and some of the studies investigate the molecular changes in pre-symptomatic phase of AD and HD respectively. However, their findings have not reached a clear consensus. To identify shared molecular changes across mouse models, I conducted a systematic meta-analysis of gene expression in mouse models of AD and HD, consisted of 369 gene expression profiles from 23 independent studies. The goal of this project is to identify transcriptional alterations shared among different mouse models of each disease respectively, especially changes during early disease phase that may link to disease-causing mechanisms, and potential common cross-disease changes. For both of the disorders, the results showed subtle but biologically interpretable changes shared across mouse models in the early disease phase that may contribute to the early disease progression: dysregulation of genes involved in cholesterol biosynthesis and complement system in AD mouse models and genes encoding mitochondrial respiratory chain complexes in HD mouse models. Cross-disease similarities in the late phase suggested that different brain regions may share mechanisms in response to neuronal loss and toxic protein aggregates.
Susceptibilidade de diferentes grupos etários às informações falsas veiculadas sobre a COVID-19 no Brasil
Creators: name: Da Luz, Maria Victória Pereira
name: Barbosa Seraine, Rodrigo
name: Oliveira, Luana Fernandes Rosa Cavalcante
name: Dias, Vitoria Merçon
name: Paulini, Fernanda
Publisher: name: figshare
Year: 2021
Subjects: Biotechnology

description: Susceptibilidade de diferentes grupos etários às informações falsas veiculadas sobre a COVID-19 no Brasil.
Letter from P.E. Cleator to Emmett L. Bennett Jr., September 13, 1958
Creators: name: Cleator, P.E.
Publisher: name: The University of Texas at Austin
Year: 1958
Subjects: Emmett L. Bennett, Jr. Collection
Emmett L. Bennett, Jr. Collection--Correspondence
Emmett L. Bennett, Jr. Collection--Correspondence--P.E. Cleator

description: Cleator expresses gratitude to Bennett for taking the time to assist with publication.
Excited Hexagon Wilson Loops for Strongly Coupled N=4 SYM
Creators: name: Bartels, J.
name: Kotanski, J.
name: Schomerus, V.
Publisher: name: arXiv
Year: 2010
Subjects: subject: High Energy Physics - Theory (hep-th)
subject: FOS: Physical sciences

description: This work is devoted to the six-gluon scattering amplitude in strongly coupled N=4 supersymmetric Yang-Mills theory. At weak coupling, an appropriate high energy limit of the so-called remainder function, i.e. of the deviation from the BDS formula, may be understood in terms of the lowest eigenvalue of the BFKL hamiltonian. According to Alday et al., amplitudes in the strongly coupled theory can be constructed through an auxiliary 1-dimensional quantum system. We argue that certain excitations of this quantum system determine the Regge limit of the remainder function at strong coupling and we compute its precise value.
description: 25 pages, 5 figures; published version -- added deeper interpretation of the results
Transformação e duplicação: a ciência a serviço da ficção científica - Aniquilação (2018)
Creators: name: Oliveira, Luana Fernandes Rosa Cavalcante
Publisher: name: figshare
Year: 2021
Subjects: Biotechnology

description: Resenha crítica: Transformação e duplicação: a ciência a serviço da ficção científica - Aniquilação (2018)
Disorder-dependent superconducting phase-diagram at high magnetic fields in Fe$_{1 + y}$Se$_{x}$Te$_{1-x}$ ($x \sim 0.4$)
Creators: name: Gebre, T.
name: Li, G.
name: Whalen, J. B.
name: Conner, B. S.
name: Zhou, H. D.
name: Grissonanche, G.
name: Kostov, M. K.
name: Gurevich, A.
name: Siegrist, T.
name: Balicas, L.
Publisher: name: arXiv
Year: 2011
Subjects: subject: Superconductivity (cond-mat.supr-con)
subject: Strongly Correlated Electrons (cond-mat.str-el)
subject: FOS: Physical sciences

description: We compare the superconducting phase-diagram under high magnetic fields (up to $H = 45$ T) of Fe$_{1+y}$Se$_{0.4}$Te$_{0.6}$ single crystals originally grown by the Bridgman-Stockbarger (BRST) technique, which were annealed to display narrow superconducting transitions and the optimal transition temperature $T_c \gtrsim 14$ K, with the diagram for samples of similar stoichiometry grown by the traveling-solvent floating-zone technique as well as with the phase-diagram reported for crystals grown by a self-flux method. We find that the so-annealed samples tend to display higher ratios $H_{c2}/T_c$, particularly for fields applied along the inter-planar direction, where the upper critical field $H_{c2}(T)$ exhibits a pronounced downward curvature followed by saturation at lower temperatures $T$. This last observation is consistent with previous studies indicating that this system is Pauli limited. An analysis of our $H_{c2}(T)$ data using a multiband theory suggests the emergence of the Farrel-Fulde-Larkin-Ovchnikov state at low temperatures. A detailed structural x-ray analysis, reveals no impurity phases but an appreciable degree of mosaicity in as-grown BRST single-crystals which remains unaffected by the annealing process. Energy-dispersive x-ray analysis showed that the annealed samples have a more homogeneous stoichiometric distribution of both Fe and Se with virtually the same content of interstitial Fe as the non-annealed ones. Thus, we conclude that stoichiometric disorder, in contrast to structural disorder, is detrimental to the superconducting phase diagram of this series under high magnetic fields. Finally, a scaling analysis of the fluctuation conductivity in the superconducting critical regime, suggests that the superconducting fluctuations have a two-dimensional character in this system.
description: 13 pages, 10 figures, submitted to Physical Review B
Seasonal habitat macroinvertebrate data from Mill Stream, Dorset, UK
Creators: name: Mathers, Kate
name: Armitage, Patrick
name: Hill, Matthew
name: Pardo, Isabel
name: Mckenzie, Morwenna
name: Wood, Paul
Publisher: name: Loughborough University
Year: 2023
Subjects: classificationCode: 41
subject: Environmental sciences

description: Data provided are primary data collected from Mill Stream in Dorset, UK, over three seasons (Spring, Summer and Autumn) in 1992. Data were collected using a 15-second kick sample (900 µm pond net) in four discrete substrate habitats (gravel, sand, silt and perennial vegetation (marginal perennial emergent Phragmites sp.)). Data resolved predominately to species level and are published in Ecology and Evolution at DOI: 10.1002/ece3.10564.
Non-equilibrium effects in a Josephson junction coupled to a precessing spin
Creators: name: Holmqvist, C.
name: Teber, S.
name: Fogelström, M.
Publisher: name: arXiv
Year: 2010
Subjects: subject: Superconductivity (cond-mat.supr-con)
subject: FOS: Physical sciences

description: We present a theoretical study of a Josephson junction consisting of two s-wave superconducting leads coupled over a classical spin. When an external magnetic field is applied, the classical spin will precess with the Larmor frequency. This magnetically active interface results in a time-dependent boundary condition with different tunneling amplitudes for spin-up and spin-down quasiparticles and where the precession produces spin-flip scattering processes. We show that as a result, the Andreev states develop sidebands and a non-equilibrium population which depend on the precession frequency and the angle between the classical spin and the external magnetic field. The Andreev states lead to a steady-state Josephson current whose current-phase relation could be used for characterizing the precessing spin. In addition to the charge transport, a magnetization current is also generated.This spin current is time-dependent and its polarization axis rotates with the same precession frequency as the classical spin.
description: 20 pages, 26 figures
Letter from Mabel Lang to Emmett L. Bennett Jr., October 11, 1962
Creators: name: Lang, Mabel
Publisher: name: The University of Texas at Austin
Year: 1962
Subjects: Emmett L. Bennett, Jr. Collection
Emmett L. Bennett, Jr. Collection--Correspondence
Emmett L. Bennett, Jr. Collection--Correspondence--Mabel Lang
John D. Pendlebury
Linear B

description: Lang confirms that she has Pendlebury's guide to the Stratigraphical Museum and asks if what she has written on Ma 216 needs any correction.
Functional renormalization for spontaneous symmetry breaking in the Hubbard model
Creators: name: Friederich, Simon
name: Krahl, Hans Christian
name: Wetterich, Christof
Publisher: name: arXiv
Year: 2010
Subjects: subject: Strongly Correlated Electrons (cond-mat.str-el)
subject: FOS: Physical sciences

description: The phases with spontaneously broken symmetries corresponding to antiferromagnetic and d-wave superconducting order in the two-dimensional t-t'-Hubbard model are investigated by means of the functional renormalization group. The introduction of composite boson fields in the magnetic, charge density and superconducting channels allows an efficient parameterization of the four-fermion vertex and the study of regimes where either the antiferromagnetic or superconducting order parameter, or both, are nonzero. We compute the phase diagram and the temperature dependence of the order parameter below the critical temperature, where antiferromagnetic and superconductiving order show a tendency of mutual exclusion.
description: 17 pages, 24 figures
Real-Time Word-Level Temporal Segmentation in Streaming Speech Recognition
Creators: name: Nishida, Naoto
name: Hiraki, Hirotaka
name: Rekimoto, Jun
name: Ishiguro, Yoshio
Publisher: name: arXiv
Year: 2025
Subjects: subject: Human-Computer Interaction (cs.HC)
subject: Multimedia (cs.MM)
subject: Sound (cs.SD)
subject: Audio and Speech Processing (eess.AS)
subject: FOS: Computer and information sciences
subject: FOS: Electrical engineering, electronic engineering, information engineering

description: Rich-text captions are essential to help communication for Deaf and hard-of-hearing (DHH) people, second-language learners, and those with autism spectrum disorder (ASD). They also preserve nuances when converting speech to text, enhancing the realism of presentation scripts and conversation or speech logs. However, current real-time captioning systems lack the capability to alter text attributes (ex. capitalization, sizes, and fonts) at the word level, hindering the accurate conveyance of speaker intent that is expressed in the tones or intonations of the speech. For example, ''YOU should do this'' tends to be considered as indicating ''You'' as the focus of the sentence, whereas ''You should do THIS'' tends to be ''This'' as the focus. This paper proposes a solution that changes the text decorations at the word level in real time. As a prototype, we developed an application that adjusts word size based on the loudness of each spoken word. Feedback from users implies that this system helped to convey the speaker's intent, offering a more engaging and accessible captioning experience.
description: 3 pages, 1 figures
Letter from Mabel Lang to Emmett L. Bennett Jr., September 11, 1962
Creators: name: Lang, Mabel
Publisher: name: The University of Texas at Austin
Year: 1962
Subjects: Emmett L. Bennett, Jr. Collection
Emmett L. Bennett, Jr. Collection--Correspondence
Emmett L. Bennett, Jr. Collection--Correspondence--Mabel Lang
Linear B

description: Lang answers a question about 1314 and offers queries about Cn 655 and Cn 719 fragment readings.
Electrospun nanofibrous membranes for water vapour transport applications
Creators: name: Huizing, Ryan Nicholas
Publisher: name: University of British Columbia
Year: 2018

description: This study discusses the development of selective water vapour permeable membranes for the separation of water vapour from air. These membranes are useful as separation media for membrane-based energy recovery ventilation devices. Current generation composite membranes for these devices consist of a polymer film layer which is permeable to water vapour but selective for water vapour over gases. In these composite membranes, this film layer is attached to one surface of a microporous polymeric support substrate. However, as it is demonstrated in this work, the microporous support contributes 30 to 50% of the resistance to water vapour transport in the composite membranes. In an attempt to eliminate this microporous substrate and its associated resistance, a membrane was developed using an electrospun nanofibrous layer as a support structure for the selective coating layer. In these membranes, the electrospun nanofibers are deposited on a non-woven micro-fibrous carrier and then the nanofibers are impregnated with a selectively permeable polymer to make impregnated electrospun nanofibrous membranes (IENM). The nanofibers are found to contribute a resistance to vapour transport in these membranes and their effect on water vapour permeability is quantified through a fiber-filled-film model. An optimization study of the IENMs demonstrated that fiber diameter and fiber volume in the film layer effect the water vapour permeance of these membranes and reducing these variables improved water vapour permeance. IEMNs were demonstrated to have water vapour permeance (>10000 GPU) while still having sufficient selectivity for the application, exceeding the performance of current generation composite membranes. The membranes were demonstrated to be particularly useful in the fabrication of ‘formable membranes’ which could be thermally-formed into exchanger plates for energy recovery ventilator exchangers. Thermal and mechanical properties of the membrane components were reported individually and as complete membranes. A membrane composition was demonstrated to fabricate exchanger plates from formable IENMs. This work contributes to the development of membranes for air-to-air exchangers specifically for energy recovery ventilation. A new class of membrane based on electrospun nanofibers for these devices was successfully demonstrated to have improved performance properties and a novel formable membrane was developed.
Absorption line systems in simulated galaxies fed by cold streams
Creators: name: Fumagalli, Michele
name: Prochaska, J. Xavier
name: Kasen, Daniel
name: Dekel, Avishai
name: Ceverino, Daniel
name: Primack, Joel R.
Publisher: name: arXiv
Year: 2011
Subjects: subject: Cosmology and Nongalactic Astrophysics (astro-ph.CO)
subject: FOS: Physical sciences

description: Hydro cosmological simulations reveal that massive galaxies at high redshift are fed by long narrow streams of merging galaxies and a smoother component of cold gas. We post-process seven high-resolution simulated galaxies with radiative transfer to study the absorption characteristics of the gas in galaxies and streams, in comparison with the statistics of observed absorption-line systems. We find that much of the stream gas is ionized by UV radiation from background and local stellar sources, but still optically thick (N_HI > 10^17 cm^-2) so that the streams appear as Lyman-limit systems (LLSs). At z>3, the fraction of neutral gas in streams becomes non-negligible, giving rise to damped Lyman-alpha (DLA) absorbers as well. The gas in the central and incoming galaxies remains mostly neutral, responsible for DLAs. Within one (two) virial radii, the covering factor of optically thick gas is <25% (10%) for LLSs and <5% (1%) for DLAs, slowly declining with time following the universal expansion. Nevertheless, galaxies and their cold streams in the studied mass range, M_vir = 10^10 - 10^12 Msun, account for >30% of the observed absorbers in the foreground of quasars, the rest possibly arising from smaller galaxies or the intergalactic medium. The mean metallicity in the streams is ~1% solar, much lower than in the galaxies. The simulated galaxies reproduce the Lyalpha-absorption equivalent widths observed around Lyman-break galaxies, but they severely underpredict the equivalent widths in metal lines, suggesting that the latter may arise from outflows. We conclude that the observed metal-poor LLSs are likely detections of the predicted cold streams. Revised analysis of the observed LLSs kinematics and simulations with more massive outflows in conjunction with the inflows may enable a clearer distinction between the signatures of the various gas modes.
description: 27 pages, 20 figures, 7 tables. MNRAS accepted
Letter from Mabel Lang to Emmett L. Bennett Jr., March 18, 1966
Creators: name: Lang, Mabel
Publisher: name: The University of Texas at Austin
Year: 1966
Subjects: Emmett L. Bennett, Jr. Collection
Emmett L. Bennett, Jr. Collection--Correspondence
Emmett L. Bennett, Jr. Collection--Correspondence--Mabel Lang
Modern Greek

description: Lang discusses with Bennett her method of learning Modern Greek and lists the instructional aids which she uses.
Slowing and stopping light using an optomechanical crystal array
Creators: name: Chang, Darrick
name: Safavi-Naeini, Amir H.
name: Hafezi, Mohammad
name: Painter, Oskar
Publisher: name: arXiv
Year: 2010
Subjects: subject: Quantum Physics (quant-ph)
subject: Optics (physics.optics)
subject: FOS: Physical sciences

description: One of the major advances needed to realize all-optical information processing of light is the ability to delay or coherently store and retrieve optical information in a rapidly tunable manner. In the classical domain, this optical buffering is expected to be a key ingredient to managing the flow of information over complex optical networks. Such a system also has profound implications for quantum information processing, serving as a long-term memory that can store the full quantum information contained in an optical pulse. Here we suggest a novel approach to light storage involving an optical waveguide coupled to an optomechanical crystal array, where light in the waveguide can be dynamically and coherently transferred into long-lived mechanical vibrations of the array. Under realistic conditions, this system is capable of achieving large bandwidths and storage/delay times in a compact, on-chip platform.
description: 18 pages, 6 figures, 5 appendices
Subwavelength electromagnetic diode: one-way response of cascading nonlinear meta-atoms
Creators: name: Fan, Yuancheng
name: Han, Jin
name: Wei, Zeyong
name: Wu, Chao
name: Cao, Yang
name: Yu, Xing
name: Li, Hongqiang
Publisher: name: arXiv
Year: 2010
Subjects: subject: Optics (physics.optics)
subject: FOS: Physical sciences

description: We propose a scheme for realizing subwavelength electromagnetic diode by employing cascading nonlinear meta-atoms. One-way response is demonstrated on a microwave transmission line comprising of three metallic ring resonators acting as meta-atoms and a varactor as the nonlinear medium inclusion. Experiments show that our implementation can operate simultaneously as forward diode and backward diode at different frequencies. A transmission contrast of up to 14.7dB was achieved between forward and backward transmission. Subwavelength size of our diode should be useful for miniaturization of integrated optical nanocircuits.
Mitigating Moduli Messes in Low-Scale SUSY Breaking
Creators: name: Fan, JiJi
name: Reece, Matthew
name: Wang, Lian-Tao
Publisher: name: arXiv
Year: 2011
Subjects: subject: High Energy Physics - Phenomenology (hep-ph)
subject: High Energy Physics - Theory (hep-th)
subject: FOS: Physical sciences

description: We discuss the physics of moduli (light scalar fields with Planck-suppressed couplings to matter) in the case of low-scale supersymmetry breaking such as gauge mediation. We argue that even if the mechanism of moduli stabilization is decoupled from the mechanism of SUSY breaking, moduli masses will generically be parametrically related to the gravitino mass once the cancellation of the cosmological constant is taken into account. For low- scale SUSY breaking, this implies that moduli fields are light, long-lived relics that will generically drive the universe into a matter-dominated phase, in contradiction to standard BBN. We discuss two scenarios for evading this problem. The first is to consider very tuned supergravity potentials that can make the moduli heavy enough to decay at early times and reheat above the temperature of BBN. Viable cosmology can be achieved in this scenario, which has a population of highly relativistic light gravitinos arising from decays of moduli. Next, we consider the more natural scenario with light moduli. The saxion field associated with the solution of the strong CP problem provides the most natural candidate for driving thermal inflation, which dilutes the moduli. We construct an explicit model for this scenario, when the PQ symmetry breaking scale is larger than the messenger scale. The combination of the constraints on relic abundance and gamma-ray flux from decay of the moduli favors a particular region of SUSY breaking scale, 2 x 10^3 - 10^4 TeV. For either scenario, we find that it is generic for low-scale SUSY to be associated with late entropy production and accompanying low reheating temperatures.
description: 26 pages, 5 figures; v2: JHEP published version (references added and minor changes)
Letter from Mabel Lang to Emmett L. Bennett Jr., November 30, 1968
Creators: name: Lang, Mabel
Publisher: name: The University of Texas at Austin
Year: 1968
Subjects: Emmett L. Bennett, Jr. Collection
Emmett L. Bennett, Jr. Collection--Correspondence
Emmett L. Bennett, Jr. Collection--Correspondence--Mabel Lang
Nestor

description: Lang shares her thoughts with Bennett on a possibility of a new Mycenaean journal and her opinion on the range of currently available publication outlets as can be seen in Nestor, a bibliographic reference of Aegean studies.
Surface and Edge States in Topological Semi-metals
Creators: name: Chu, Rui-Lin
name: Shan, Wen-Yu
name: Lu, Jie
name: Shen, Shun-Qing
Publisher: name: arXiv
Year: 2010
Subjects: subject: Mesoscale and Nanoscale Physics (cond-mat.mes-hall)
subject: FOS: Physical sciences

description: We study the topologically non-trivial semi-metals by means of the 6-band Kane model. Existence of surface states is explicitly demonstrated by calculating the LDOS on the material surface. In the strain free condition, surface states are divided into two parts in the energy spectrum, one part is in the direct gap, the other part including the crossing point of surface state Dirac cone is submerged in the valence band. We also show how uni-axial strain induces an insulating band gap and raises the crossing point from the valence band into the band gap, making the system a true topological insulator. We predict existence of helical edge states and spin Hall effect in the thin film topological semi-metals, which could be tested with future experiment. Disorder is found to significantly enhance the spin Hall effect in the valence band of the thin films.
General stationary charged black holes as charged particle accelerators
Creators: name: Zhu, Yi
name: Wu, Shao-Feng
name: Liu, Yu-Xiao
name: Jiang, Ying
Publisher: name: arXiv
Year: 2011
Subjects: subject: High Energy Physics - Theory (hep-th)
subject: High Energy Astrophysical Phenomena (astro-ph.HE)
subject: General Relativity and Quantum Cosmology (gr-qc)
subject: FOS: Physical sciences

description: We study the possibility of getting infinite energy in the center of mass frame of colliding charged particles in a general stationary charged black hole. For black holes with two-fold degenerate horizon, it is found that arbitrary high center-of-mass energy can be attained, provided that one of the particle has critical angular momentum or critical charge, and the remained parameters of particles and black holes satisfy certain restriction. For black holes with multiple-fold degenerate event horizons, the restriction is released. For non-degenerate black holes, the ultra-high center-of-mass is possible to be reached by invoking the multiple scattering mechanism. We obtain a condition for the existence of innermost stable circular orbit with critical angular momentum or charge on any-fold degenerate horizons, which is essential to get ultra-high center-of-mass energy without fine-tuning problem. We also discuss the proper time spending by the particle to reach the horizon and the duality between frame dragging effect and electromagnetic interaction. Some of these general results are applied to braneworld small black holes.
description: 23 pages, no figures, revised version accepted for publication in Phys. Rev. D
Numerical relativity for D dimensional space-times: head-on collisions of black holes and gravitational wave extraction
Creators: name: Witek, Helvi
name: Zilhao, Miguel
name: Gualtieri, Leonardo
name: Cardoso, Vitor
name: Herdeiro, Carlos
name: Nerozzi, Andrea
name: Sperhake, Ulrich
Publisher: name: arXiv
Year: 2010
Subjects: subject: General Relativity and Quantum Cosmology (gr-qc)
subject: High Energy Astrophysical Phenomena (astro-ph.HE)
subject: High Energy Physics - Phenomenology (hep-ph)
subject: High Energy Physics - Theory (hep-th)
subject: FOS: Physical sciences

description: Black objects in higher dimensional space-times have a remarkably richer structure than their four dimensional counterparts. They appear in a variety of configurations (e.g. black holes, black branes, black rings, black Saturns), and display complex stability phase diagrams. They might also play a key role in high energy physics: for energies above the fundamental Planck scale, gravity is the dominant interaction which, together with the hoop-conjecture, implies that the trans-Planckian scattering of point particles should be well described by black hole scattering. Higher dimensional scenarios with a fundamental Planck scale of the order of TeV predict, therefore, black hole production at the LHC, as well as in future colliders with yet higher energies. In this setting, accurate predictions for the production cross-section and energy loss (through gravitational radiation) in the formation of black holes in parton-parton collisions is crucial for accurate phenomenological modelling in Monte Carlo event generators. In this paper, we use the formalism and numerical code reported in arXiv:1001.2302 to study the head-on collision of two black holes. For this purpose we provide a detailed treatment of gravitational wave extraction in generic D-dimensional space-times, which uses the Kodama-Ishibashi formalism. For the first time, we present the results of numerical simulations of the head-on collision in five space-time dimensions, together with the relevant physical quantities. We show that the total radiated energy, when two black holes collide from rest at infinity, is approximately (0.089\pm 0.006)% of the centre of mass energy, slightly larger than the 0.055% obtained in the four dimensional case, and that the ringdown signal at late time is in very good agreement with perturbative calculations.
description: 31 pages, 12 figures, RevTex4. v2: Published version. Further details can be found at http://blackholes.ist.utl.pt/
Non-Timber Forest Products : Indigenous ethnobotanical knowledge and livelihood security in West Suriname
Creators: name: Van Den Boog, Tim
Publisher: name: University of British Columbia
Year: 2017

description: Suriname is highly forested and inhabited by Indigenous peoples who are dependent on a diverse range of Non-Timber Forest Products (NTFPs) for their subsistence and income. NTFP knowledge is decreasing due to fragmented knowledge transmission. The NTFP-containing forests are also of interest to multinational extractive companies. Without co-managed governance and weak tenure security, livelihoods and biodiversity can become jeopardised. This thesis focuses on two Indigenous communities that vary in forest-dependency and exposure to urbanisation. Children’s ethnobotanical knowledge is compared to determine causes of ethnobotanical knowledge losses. In addition, land tenure regimes are assessed and ecological impacts from NTFP harvests are determined. Voucher specimens were collected and ethnobotanical data were obtained from informants. Questionnaires were used to elicit and record children’s ethnobotanical knowledge and that of NTFP gatherers to define important NTFP species. Market surveys were held to determine commercial NTFPs. It was shown that school attendance and the limited time spent in forests disrupt the acquisition of ethnobotanical knowledge by children. At the same time, acculturation can lead to cross-cultural knowledge exchange, strengthening the communities’ knowledge about NTFPs. The research further demonstrated that the uses of commercial and food NTFPs were known prior to the acquisition of knowledge of plant names, confirming that ethnobotanical knowledge acquisition at a young age happens through observation. Ecological risks from overharvesting seeds from vegetal NTFPs included trophic cascades: population declines of targeted species and animals that feed on them. For the commercially most traded animals, a decrease in abundancy was noticed as a result of increased local and non-local demands. Because of a sudden high global demand for Potamotrygon boesemani, stocks of this endemic stingray are imperilled. NTFP gathering largely happened outside the communities’ communal forest on State lands under active or proposed logging concessions. Traditional NTFP practices should be safeguarded by protecting gathering sites and targeted species. Strengthening of Indigenous with government co-management is needed for effective forest governance. Moreover, long-term research is desirable on current NTFP stocks and the impacts of NTFP harvesting on target species and their ecosystem. An immediate moratorium on P. boesemani is required to prevent this species from further collapse or potential extinction.
Letter from D.J.N. Lee to Emmett L. Bennett Jr., February 12, 1957
Creators: name: Lee, D.J.N.
Publisher: name: The University of Texas at Austin
Year: 1957
Subjects: Emmett L. Bennett, Jr. Collection
Emmett L. Bennett, Jr. Collection--Correspondence
Emmett L. Bennett, Jr. Collection--Correspondence--D.J.N. Lee
Linear B
Landowners of Pylos

description: Lee agrees with Bennett that there is an error in Jn 389's math. He discusses other tablets where scribal calculation errors occur and ask Bennett to send an offprint of Landowners at Pylos from AJA 60.
Reducing orbital eccentricity of precessing black-hole binaries
Creators: name: Buonanno, Alessandra
name: Kidder, Lawrence E.
name: Mroué, Abdul H.
name: Pfeiffer, Harald P.
name: Taracchini, Andrea
Publisher: name: arXiv
Year: 2010
Subjects: subject: General Relativity and Quantum Cosmology (gr-qc)
subject: FOS: Physical sciences

description: Building initial conditions for generic binary black-hole evolutions without initial spurious eccentricity remains a challenge for numerical-relativity simulations. This problem can be overcome by applying an eccentricity-removal procedure which consists in evolving the binary for a couple of orbits, estimating the eccentricity, and then correcting the initial conditions. The presence of spins can complicate this procedure. As predicted by post-Newtonian theory, spin-spin interactions and precession prevent the binary from moving along an adiabatic sequence of spherical orbits, inducing oscillations in the radial separation and in the orbital frequency. However, spin-induced oscillations occur at approximately twice the orbital frequency, therefore they can be distinguished from the initial spurious eccentricity, which occurs at approximately the orbital frequency. We develop a new removal procedure based on the derivative of the orbital frequency and find that it is successful in reducing the eccentricity measured in the orbital frequency to less than 0.0001 when moderate spins are present. We test this new procedure using numerical-relativity simulations of binary black holes with mass ratios 1.5 and 3, spin magnitude 0.5 and various spin orientations. The numerical simulations exhibit spin-induced oscillations in the dynamics at approximately twice the orbital frequency. Oscillations of similar frequency are also visible in the gravitational-wave phase and frequency of the dominant mode.
description: 17 pages, 11 figures, fixed typos
Letter from D.J.N. Lee to Emmett L. Bennett Jr., April 9, 1957
Creators: name: Lee, D.J.N.
Publisher: name: The University of Texas at Austin
Year: 1957
Subjects: Emmett L. Bennett, Jr. Collection
Emmett L. Bennett, Jr. Collection--Correspondence
Emmett L. Bennett, Jr. Collection--Correspondence--D.J.N. Lee
Linear B
Hittite

description: Lee thanks Bennett for sending him a publication and suggests a format for any further indices. He considers whether a Mycenaean weight ideogram and the Hittite ideogram for one half could represent the action of halving something.
Letter from D.J.N. Lee to Emmett L. Bennett Jr., October 29, 1960
Creators: name: Lee, D.J.N.
Publisher: name: The University of Texas at Austin
Year: 1960
Subjects: Emmett L. Bennett, Jr. Collection
Emmett L. Bennett, Jr. Collection--Correspondence
Emmett L. Bennett, Jr. Collection--Correspondence--D.J.N. Lee
Nestor
Mycenae

description: Lee thanks Bennett for sending a copy of Nestor and asks him to send maps of Mycenae as well.
Detection of new point-sources in WMAP Cosmic Microwave Background (CMB) maps at high Galactic latitude. A new technique to extract point sources from CMB maps
Creators: name: Ramos, Elsa Patricia R. G.
name: Vio, Roberto
name: Andreani, Paola
Publisher: name: arXiv
Year: 2010
Subjects: subject: Cosmology and Nongalactic Astrophysics (astro-ph.CO)
subject: Instrumentation and Methods for Astrophysics (astro-ph.IM)
subject: FOS: Physical sciences

description: In experimental microwave maps, point-sources can strongly affect the estimation of the power-spectrum and/or the test of Gaussianity of the Cosmic Microwave Background (CMB) component. As a consequence, their removal from the sky maps represents a critical step in the analysis of the CMB data. Before removing a source, however, it is necessary to detect it and source extraction consists of a delicate preliminary operation. In the literature, various techniques have been presented to detect point-sources in the sky maps. The most sophisticated ones exploit the multi-frequency nature of the observations that is typical of the CMB experiments. These techniques have "optimal" theoretical properties and, at least in principle, are capable of remarkable performances. Actually, they are rather difficult to use and this deteriorates the quality of the obtainable results. In this paper, we present a new technique, the "weighted matched filter" (WMF), that is quite simple to use and hence more robust in practical applications. Such technique shows particular efficiency in the detection of sources whose spectra have a slope different from zero. We apply this method to three Southern Hemisphere sky regions - each with an area of 400 square degrees - of the seven years Wilkinson Microwave Anisotropy Probe (WMAP) maps and compare the resulting sources with those of the two seven-year WMAP point-sources catalogues. In these selected regions we find seven additional sources not previously listed in WMAP catalogues and discuss their most likely identification and spectral properties.
description: Astronomy and Astrophysics, 2011, in press
Evolution of cooperation facilitated by reinforcement learning with adaptive aspiration levels
Creators: name: Tanabe, Shoma
name: Masuda, Naoki
Publisher: name: arXiv
Year: 2011
Subjects: subject: Populations and Evolution (q-bio.PE)
subject: FOS: Biological sciences

description: Repeated interaction between individuals is the main mechanism for maintaining cooperation in social dilemma situations. Variants of tit-for-tat (repeating the previous action of the opponent) and the win-stay lose-shift strategy are known as strong competitors in iterated social dilemma games. On the other hand, real repeated interaction generally allows plasticity (i.e., learning) of individuals based on the experience of the past. Although plasticity is relevant to various biological phenomena, its role in repeated social dilemma games is relatively unexplored. In particular, if experience-based learning plays a key role in promotion and maintenance of cooperation, learners should evolve in the contest with nonlearners under selection pressure. By modeling players using a simple reinforcement learning model, we numerically show that learning enables the evolution of cooperation. We also show that numerically estimated adaptive dynamics appositely predict the outcome of evolutionary simulations. The analysis of the adaptive dynamics enables us to capture the obtained results as an affirmative example of the Baldwin effect, where learning accelerates the evolution to optimality.
description: 8 figures and 1 table
[Record of Hudson River ice, 1786-1837] : [manuscript]
Creators: name: (:Unav)
Publisher: name: Columbia University
Year: 1837
Subjects: Ice on rivers, lakes, etc.--Hudson River (N.Y. and N.J.)--Statistics.
Ice on rivers, lakes, etc.--Hudson River (N.Y. and N.J.)--Observations.

description: Manuscript record of yearly dates on which the Hudson River closed and opened from ice obstruction, from 1786 until 1837; some years are incomplete