WorldWideScience

Sample records for larminie andrew dicks

  1. Moby Dick.

    Science.gov (United States)

    Stern, Milton R.

    1986-01-01

    Discusses examples in "Moby Dick" of Melvillean words symptomatic of the significance of Ishmael's rhetorical energy, in order to suggest that Ishmael's language reflects Melville's search for lexical and rhetorical forms that express the democratic impulse. (SRT)

  2. Interview with Dick Whiteside

    Science.gov (United States)

    Winarski, Kathy

    2005-01-01

    Dick Whiteside, Vice President for Enrollment Management at Tulane University, is one of the leading strategists in the field of enrollment management. Dr. Whiteside has held influential positions at the University of Hartford, in West Hartford, Connecticut, The Johns Hopkins University in Baltimore, Maryland, the City University of New York in…

  3. Dicke Superradiance in Solids

    OpenAIRE

    Cong, Kankan; Zhang, Qi; Wang, Yongrui; Noe II, G. Timothy; Belyanin, Alexey; Kono, Junichiro

    2016-01-01

    Recent advances in optical studies of condensed matter have led to the emergence of phenomena that have conventionally been studied in the realm of quantum optics. These studies have not only deepened our understanding of light-matter interactions but also introduced aspects of many-body correlations inherent in optical processes in condensed matter systems. This article is concerned with superradiance (SR), a profound quantum optical process predicted by Dicke in 1954. The basic concept of S...

  4. Brans-Dicke geometry

    CERN Document Server

    Punzi, Raffaele; Wohlfarth, Mattias N R

    2008-01-01

    We reveal the non-metric geometry underlying omega-->0 Brans-Dicke theory by unifying the metric and scalar field into a single geometric structure. Taking this structure seriously as the geometry to which matter universally couples, we show that the theory is fully consistent with solar system tests. This is in striking constrast with the standard metric coupling, which grossly violates post-Newtonian experimental constraints.

  5. Brans-Dicke geometry

    Energy Technology Data Exchange (ETDEWEB)

    Punzi, Raffaele [Zentrum fuer Mathematische Physik und II. Institut fuer Theoretische Physik, Universitaet Hamburg, Luruper Chaussee 149, 22761 Hamburg (Germany)], E-mail: raffaele.punzi@desy.de; Schuller, Frederic P. [Max Planck Institut fuer Gravitationsphysik, Albert Einstein Institut, Am Muehlenberg 1, 14467 Potsdam (Germany)], E-mail: fps@aei.mpg.de; Wohlfarth, Mattias N.R. [Zentrum fuer Mathematische Physik und II. Institut fuer Theoretische Physik, Universitaet Hamburg, Luruper Chaussee 149, 22761 Hamburg (Germany)], E-mail: mattias.wohlfarth@desy.de

    2008-12-11

    We reveal the non-metric geometry underlying {omega}{yields}0 Brans-Dicke theory by unifying the metric and scalar field into a single geometric structure. Taking this structure seriously as the geometry to which matter universally couples, we show that the theory is fully consistent with solar system tests. This is in striking contrast with the standard metric coupling, which grossly violates post-Newtonian experimental constraints.

  6. Andrew: CMU's New Computing Environment.

    Science.gov (United States)

    Zabowski, Susan

    1986-01-01

    Reviews the progress and problems associated with the development of Carnegie Mellon University's new computing and communications system, "Andrew." Describes the accomplishments and capacities of the system and provides examples of the programs developed for "Andrew." (ML)

  7. The Apocryphal Acts Of Andrew

    NARCIS (Netherlands)

    Bremmer, Jan N.

    2000-01-01

    Following the first three volumes of the new series on the Acts of John (1995), the Acts of Paul and Thecla (1996) and the Acts of Peter (1998), this new volume is devoted to the Acts of Andrew. After a study of the relationship between the Acts of Andrew and the Acts of Andrew and Matthias, the maj

  8. Louis Dick (1921 - 2014)

    CERN Multimedia

    2014-01-01

    Louis Dick, a CERN experimental physicist of international renown, passed away on 14 July.   Louis in his office, a veritable archaeological wonder with strata of documents corresponding to various eras of physics. Born in Geneva on 27 April 1921, Louis obtained a physics degree at ETH-Zurich in 1946 before moving to the Institut du Radium in Paris, where he joined the group led by Frédéric and Irène Joliot-Curie. He took a leave of absence in 1957 to go to CERN, where he remained until well beyond his retirement in 1986. In the late 1950s and early 1960s, Louis worked at CERN’s Synchrocyclotron (SC) and later on studies at the Proton Synchrotron (PS). When the first polarised proton target arrived at CERN from Saclay in 1963, Louis proposed using it for studies of spin effects in pion-proton elastic scattering at the PS, and between 1964 and 1966 sizeable spin effects were found. Louis and his collaborators then continued these studies wi...

  9. Lovelock-Brans-Dicke gravity

    CERN Document Server

    Tian, David Wenjie

    2016-01-01

    According to Lovelock's theorem, the Hilbert-Einstein and the Lovelock actions are indistinguishable from their field equations. However, they have different scalar-tensor counterparts, which correspond to the Brans-Dicke and the \\emph{Lovelock-Brans-Dicke} (LBD) gravities, respectively. In this paper the LBD model of alternative gravity with the Lagrangian density $\\mathscr{L}_{\\text{LBD}}=\\frac{1}{16\\pi}\\left[\\phi\\left(R+\\frac{a}{\\sqrt{-g}}{}^*RR + b\\mathcal{G}\\right)-\\frac{\\omega_{\\text L}}{\\phi}\

  10. De geurtocht van Marcel Dicke.

    NARCIS (Netherlands)

    Beekman, W.

    1994-01-01

    Interview with Marcel Dicke who is involved in research on the relationship between phytophagous insects and mites, their predators and the host plants. Plants produce attractants, mostly terpenes, to attrack the predators. Possible applications of this mechanism for pest control are discussed

  11. Moby-Dick. [Lesson Plan].

    Science.gov (United States)

    Soderquist, Alisa

    Based on Herman Melville's novel "Moby-Dick," this lesson plan presents activities designed to help students understand that the novel is grounded in facts that Melville acquired in his own experiences at sea; New England was the center of a prospering whaling industry in the 19th century; and journal keeping was not uncommon among 19th-century…

  12. Andrew A. Benson: personal recollections.

    Science.gov (United States)

    Nonomura, Arthur; Lorimer, George; Holtz, Barry; Vacquier, Victor; Biel, Karl Y; Govindjee

    2016-03-01

    Andrew A. Benson, one of the greatest and much loved scientists of our century, passed away on January 16, 2015; he was born on September 24, 1917. A grand celebration of his life was held on February 6, 2015, in California. Here, we present one of his photographs and key excerpts from what was said then, and soon thereafter.

  13. Andrew Lenard: A Mystery Unraveled

    Directory of Open Access Journals (Sweden)

    Jeffery Praught

    2005-10-01

    Full Text Available The theory of bi-Hamiltonian systems has its roots in what is commonly referred to as the ``Lenard recursion formula''. The story about the discovery of the formula told by Andrew Lenard is the subject of this article.

  14. Detecting Multiparticle Entanglement of Dicke States

    DEFF Research Database (Denmark)

    Lücke, Bernd; Peise, Jan; Vitagliano, Giuseppe

    2014-01-01

    of entangled states, including Dicke states. Experimentally, we produce a Dicke-like state using spin dynamics in a Bose-Einstein condensate. Our criterion proves that it contains at least genuine 28-particle entanglement. We infer a generalized squeezing parameter of −11.4(5)  dB....

  15. Brans-Dicke brane cosmology

    CERN Document Server

    Mendes, L E; Mendes, Luis E.; Mazumdar, Anupam

    2001-01-01

    A five dimensional brane cosmology with non-minimally coupled scalar field to gravity has been considered in a Jordan-Brans-Dicke frame. We derive an effective four dimensional field equations on a 3+1 dimensional brane where the fifth dimension has been assumed to have an orbifold symmetry. We have noticed that the evolution equation for the matter component stuck to the brane is non-trivially coupled to the scalar field living on the brane and the bulk. Finally we discuss some cosmological consequences of this set-up.

  16. Conformal classes of Brans-Dicke gravity

    CERN Document Server

    Quirós, I

    1999-01-01

    A classification of Brans-Dicke theories of gravitation, based on the behaviour of the dimensionless gravitational coupling constant, is given. It is noted that the discussion takes place in the current literature, about which of the two distinguished conformal frames in which scalar-tensor theories of gravity can be formulated: the Jordan frame and the Einstein frame, is the physical one, may, in most cases, be meaningless for both frames may belong to the same conformal class. It is also noted that the Jordan frame formulation of Brans-Dicke gravity with ordinary matter nonminimally coupled is scale-invariant, unlike the situation with the Jordan frame formulation of Brans-Dicke gravity with matter minimally coupled (the original formulation of Brans-Dicke theory), where the presence of nonzero mass ordinary matter breaks the scale-invariance of the theory.

  17. Quintessence Problem and Brans-Dicke Theory

    OpenAIRE

    Chakraborty, Subenoy; Chakraborty, N. C.; Debnath, Ujjal

    2003-01-01

    It has been shown that Brans-Dicke (BD) theory in anisotropic cosmological model can alone solve the quintessence problem and we have accelerated expanding universe without any quintessence matter. Also the flatness problem has been discussed in this context.

  18. Andrew Ng 谈 Deep Learning

    Institute of Scientific and Technical Information of China (English)

    卢鸫翔

    2014-01-01

    Andrew Ng是Deep Learning领域最富盛名的科学家之一,他也是斯坦福人工智能实验室主任,在线教育平台Coursera的创始人之一。2014年5月,他加入百度,负责“百度大脑”计划,并担任百度首席科学家。目前,他接受了《程序员》的专访。

  19. Fermions in Brans-Dicke cosmology

    CERN Document Server

    Samojeden, L L; Kremer, G M

    2010-01-01

    Using the Brans-Dicke theory of gravitation we put under investigation a hypothetical universe filled with a fermionic field (with a self interaction potential) and a matter constituent ruled by a barotropic equation of state. It is shown that the fermionic field (in combination with the Brans-Dicke scalar field could be responsible for a final accelerated era, after an initial matter dominated period.

  20. THE ALTERNATE REALITIES OF PHILIP K. DICK

    OpenAIRE

    Mladen M. Jakovljević

    2012-01-01

    The science fiction of Philip K. Dick examines the issues of authenticity of reality and ontologicalpluralism through unique theories and mechanisms that Dick developed by using his ownunderstanding of alternate realities, time, simulations and cognitive processes, which all play animportant role in the perception of reality. Dick’s fiction describes a search for truth and highlightsthat reality might be fake and that it may be a construct, an illusion among numerous levels of theinauthentici...

  1. The private sector provides the energy services solution for St Andrew`s College

    Energy Technology Data Exchange (ETDEWEB)

    Corcoran, J. [St. Andrews College, Glasgow (United Kingdom)

    1998-05-01

    Energy management, together with CHP, offers many advantages to both large and small organisations. A typical small organisation is St Andrew College, near Glasgow. The Estates and Facilities Manager at St Andrew`s relates a case study of what is possible at such an establishment. (author)

  2. The complete Brans–Dicke theories

    Energy Technology Data Exchange (ETDEWEB)

    Kofinas, Georgios, E-mail: gkofinas@aegean.gr

    2017-01-15

    Given that the simple wave equation of Brans–Dicke theory for the scalar field is preserved, we have investigated, through exhaustively analyzing the Bianchi identities, the consistent theories which violate the exact energy conservation equation. It is found that only three theories exist which are unambiguously determined from consistency, without imposing arbitrary functions by hand. Each of these theories possesses a specific interaction term which controls the energy exchange between the scalar field and ordinary matter. The theories contain new parameters (integration constants from the integration procedure) and when these are switched-off, Brans–Dicke theory emerges. As usually, the vacuum theories can be defined from the complete Brans–Dicke theories when the matter energy–momentum tensor vanishes.

  3. The complete Brans-Dicke theory

    CERN Document Server

    Kofinas, Georgios

    2015-01-01

    The most general completion of Brans-Dicke gravity is found when energy is exchanged in a uniquely defined way between the scalar field and ordinary matter. The theory contains a new parameter (integration constant from the integration procedure) and when this is switched off, Brans-Dicke theory emerges. As usually, the vacuum theory can be defined from the complete Brans-Dicke theory when the matter energy-momentum tensor vanishes. However, additionally, the complete family of vacuum theories is found, consistent with the free wave equation for the scalar field. The subclass of this family with identically covariantly conserved energy-momentum tensor is identified and, thus, can be supplemented by any equation of motion for the scalar field.

  4. Detecting multiparticle entanglement of Dicke states.

    Science.gov (United States)

    Lücke, Bernd; Peise, Jan; Vitagliano, Giuseppe; Arlt, Jan; Santos, Luis; Tóth, Géza; Klempt, Carsten

    2014-04-18

    Recent experiments demonstrate the production of many thousands of neutral atoms entangled in their spin degrees of freedom. We present a criterion for estimating the amount of entanglement based on a measurement of the global spin. It outperforms previous criteria and applies to a wider class of entangled states, including Dicke states. Experimentally, we produce a Dicke-like state using spin dynamics in a Bose-Einstein condensate. Our criterion proves that it contains at least genuine 28-particle entanglement. We infer a generalized squeezing parameter of -11.4(5)  dB.

  5. Obituary: Andrew Stephen Wilson, 1947-2008

    Science.gov (United States)

    Veilleux, Sylvain

    2009-01-01

    On 24 May 2008, Andrew Stephen Wilson passed away at the age of 61, in his home in Silver Spring, Maryland, from complications resulting from a painful spinal illness. Andrew was arguably one of the first truly multi-wavelength astronomers of his generation. His scientific work on active galactic nuclei [AGN] spanned the entire electromagnetic spectrum from the radio to the X-rays. Andrew was born in Doncaster, Yorkshire, England, on 26 March 1947. He was the younger of two brothers whose births were separated by the Second World War. His father, Norman, came from a relatively affluent family who were coal merchants. His mother, Mary, came from a less comfortable background, one of seven children, daughter of a skilled cabinet maker/French polisher, who went through a very hard time during the depression. As a teacher, she placed enormous value on hard work and education as a way of gaining advancement in life. When Andrew was four, the family moved to Skipton, a nice market town in the Yorkshire dales. Andrew went to a small village school until age eleven when he entered Ermysted's Grammar School. He was an enthusiastic soccer and cricket player. He never lost his enthusiasm for soccer and supported the local soccer team, Leeds United, for all his life. Andrew also followed the Yorkshire county cricket team. Andrew's interest in astronomy stemmed from the fact that at Ermysted's Grammar School someone donated a four-inch refracting telescope, so he and his friends used to go back in the evenings to investigate the rings of Saturn, the moons of Jupiter, and various nebulae. While an undergraduate at Cambridge, Andrew joined the astronomy club and ground an 8-inch mirror by hand as a part of a telescope that he set up in the backyard of his parents' house. Andrew spent hours observing with this telescope, and it was the wonder of the family. At Cambridge, Andrew obtained his bachelor's degree with first-class honors in 1969. During a short visit in London with his

  6. Wormholes in vacuum Brans-Dicke theory

    CERN Document Server

    Bhadra, A; Bhadra, Arunava; Sarkar, Kabita

    2005-01-01

    It is shown that among the different classes of claimed static wormhole solutions of the vacuum Brans-Dicke theory only Brans Class I solution with coupling constant $\\omega$ less than -1.5 (excluding the point $\\omega =2$) gives rise to physically viable traversable wormhole geometry. Usability of this wormhole geometry for interstellar travel has been examined.

  7. Mass Inflation in Brans-Dicke gravity

    CERN Document Server

    Pina-Avelino, P; Herdeiro, C A R

    2009-01-01

    A detailed non-linear analysis of the internal structure of spherical, charged black holes that are accreting scalar matter is performed in the framework of the Brans-Dicke theory of gravity. We choose the lowest value of the Brans-Dicke parameter that is compatible with observational constraints. First, the homogeneous approximation is used. It indicates that mass inflation occurs and that the variations of the Brans-Dicke scalar inside the black hole, which could in principle be large in the absence of mass inflation, become small when mass inflation does occur. Then, a full non-linear numerical study of the black hole interior perturbed by a self-gravitating massless uncharged scalar-field is performed. We use an algorithm with adaptive mesh refinement capabilities. In this way, the changes in the internal structure of the black hole caused by mass inflation are determined, as well as the induced variations of the Brans-Dicke scalar, confirming, qualitatively, the indications given by the homogeneous appro...

  8. Overview of the Moby Dick project

    NARCIS (Netherlands)

    Smit, Gerardus Johannes Maria; Havinga, Paul J.M.; Mullender, Sape J.; Helme, A.; Hartvigsen, Gunnar; Fallmyr, Terje; Stabell-Kulo, Tage; Bartoli, Alberto; Dini, Gianluca; Rizzo, Luigi; Avvenuti, Marco; Seppanen, T.

    The Moby Dick project focuses on developing theories, architectures and applications for a new generation of hand-held computers. The combination of an intelligent information system and a location system enables many new types of applications, such as admission control, digital chequebook, paging,

  9. Cell scientist to watch - Andrew Holland.

    Science.gov (United States)

    2017-02-01

    Andrew received his first degree in natural sciences from the University of Cambridge and a Masters degree from the University of Manchester, followed by a PhD with Stephen Taylor in Manchester. He then moved to California in 2007 with an EMBO long-term fellowship for his postdoctoral research with Don Cleveland at the Ludwig Institute for Cancer Research. In 2013, Andrew started his own lab as an Assistant Professor in the Department of Molecular Biology and Genetics at the Johns Hopkins University School of Medicine, having been named a Kimmel Scholar and a Pew-Stewart Scholar in 2014. Andrew's lab investigates the mechanisms controlling centrosome copy numbers during cell division and the links between centrosome amplification, genome instability and tumorigenesis.

  10. Third Quantization of Brans-Dicke Cosmology

    CERN Document Server

    Pimentel, L O; Pimentel, Luis O.; Mora, Cesar

    2001-01-01

    We study the third quantization of a Brans-Dicke toy model, we calculate the number density of the universes created from nothing and found that it has a Planckian form. Also, we calculated the uncertainty relation for this model by means of functional Schr"odinger equation and we found that fluctuations of the third-quantized universe field tends to a finite limit in the course of cosmic expansion.

  11. Generalized Mattig's relation in Brans-Dicke-Rastall gravity

    CERN Document Server

    Salako, Ines G; Jawad, Abdul

    2016-01-01

    The Geodesic Deviation Equation is being studied in Brans-Dicke-Rastall gravity. We briefly discuss the Brans-Dicke-Rastall gravity and then construct GDE for FLRW metric. In this way, the obtained geodesic deviation equation will correspond to the Brans-Dicke-Rastall gravity. Eventually, we solve numerically the null vector GDE to obtain from Mattig relation, the deviation vector $\\eta(z)$ and observer area distance $r_0(z)$ and compare the results with $\\Lambda$CDM model.

  12. Moby Dick, het ontwerp van een Digitale Kameraad

    NARCIS (Netherlands)

    Havinga, Paul J.M.; Smit, Gerard J.M.

    2000-01-01

    Zullen de zaktelefoon en de mobiele computer uitgroeien tot een Digitale Kameraad waarmee je betaalt, de voordeur opent, jezelf identificeert en luistert naar muziek tijdens het joggen? Dit is een vraag waar het MOBY DICK project zich mee bezig houdt. In het MOBY DICK project van het cluster Embedde

  13. What We Talk around when We Talk about "The Dick"

    Science.gov (United States)

    Savage, Elizabeth

    2011-01-01

    Some years ago, the author had her first opportunity to teach an undergraduate American Romanticism course, which meant she had a chance to teach "Moby-Dick" the way she thought it should be taught. Meeting two days a week, her course was set up so that students read about thirty pages of "Moby-Dick" for one class meeting a week paired with…

  14. What We Talk around when We Talk about "The Dick"

    Science.gov (United States)

    Savage, Elizabeth

    2011-01-01

    Some years ago, the author had her first opportunity to teach an undergraduate American Romanticism course, which meant she had a chance to teach "Moby-Dick" the way she thought it should be taught. Meeting two days a week, her course was set up so that students read about thirty pages of "Moby-Dick" for one class meeting a week paired with…

  15. Euclidean non-vacuum wormholes in Brans-Dicke theory

    Institute of Scientific and Technical Information of China (English)

    Lu Hui-Qing; Ji Pei-Yong; Pan Peng-Peng

    2004-01-01

    The Brans-Dicke theory is investigated in which the Pauli metric is identified to be a physical spacetime metric.The solutions of a wormhole are obtained in Brans-Dicke theory with a relativistic radiation field for ω> -3/2.However, it is found that one cannot construct a wormhole in the presence of a 3-form axion field.

  16. Solar Oblateness from Archimedes to Dicke

    CERN Document Server

    Sigismondi, C; Sigismondi, Costantino; Oliva, Pietro

    2005-01-01

    The non-spherical shape of the Sun has been invoked to explain the anomalous precession of Mercury. A brief history of some methods for measuring solar diameter is presented. Archimedes was the first to give upper and lower values for solar diameter in third century before Christ; we also show the method of total eclipses, used after Halley's observative campaign of 1715 eclipse; the variant of partial eclipses useful to measure different chords of the solar disk; the method of Dicke which correlates oblateness with luminous excess in the equatorial zone.

  17. Functional methods in the generalized Dicke model

    Energy Technology Data Exchange (ETDEWEB)

    Alcalde, M. Aparicio; Lemos, A.L.L. de; Svaiter, N.F. [Centro Brasileiro de Pesquisas Fisicas (CBPF), Rio de Janeiro, RJ (Brazil)]. E-mails: aparicio@cbpf.br; aluis@cbpf.br; nfuxsvai@cbpf.br

    2007-07-01

    The Dicke model describes an ensemble of N identical two-level atoms (qubits) coupled to a single quantized mode of a bosonic field. The fermion Dicke model should be obtained by changing the atomic pseudo-spin operators by a linear combination of Fermi operators. The generalized fermion Dicke model is defined introducing different coupling constants between the single mode of the bosonic field and the reservoir, g{sub 1} and g{sub 2} for rotating and counter-rotating terms respectively. In the limit N -> {infinity}, the thermodynamic of the fermion Dicke model can be analyzed using the path integral approach with functional method. The system exhibits a second order phase transition from normal to superradiance at some critical temperature with the presence of a condensate. We evaluate the critical transition temperature and present the spectrum of the collective bosonic excitations for the general case (g{sub 1} {ne} 0 and g{sub 2} {ne} 0). There is quantum critical behavior when the coupling constants g{sub 1} and g{sub 2} satisfy g{sub 1} + g{sub 2}=({omega}{sub 0} {omega}){sup 1/2}, where {omega}{sub 0} is the frequency of the mode of the field and {omega} is the energy gap between energy eigenstates of the qubits. Two particular situations are analyzed. First, we present the spectrum of the collective bosonic excitations, in the case g{sub 1} {ne} 0 and g{sub 2} {ne} 0, recovering the well known results. Second, the case g{sub 1} {ne} 0 and g{sub 2} {ne} 0 is studied. In this last case, it is possible to have a super radiant phase when only virtual processes are introduced in the interaction Hamiltonian. Here also appears a quantum phase transition at the critical coupling g{sub 2} ({omega}{sub 0} {omega}){sup 1/2}, and for larger values for the critical coupling, the system enter in this super radiant phase with a Goldstone mode. (author)

  18. Dynamical symmetries in Brans-Dicke cosmology

    CERN Document Server

    Papagiannopoulos, G; Basilakos, S; Giacomini, A; Paliathanasis, A

    2016-01-01

    In the context of generalised Brans-Dicke cosmology we use the Killing tensors of the minisuperspace in order to determine the unspecified potential of a scalar-tensor gravity theory. Specifically, based on the existence of contact symmetries of the field equations, we find four types of potentials which provide exactly integrable dynamical systems. We investigate the dynamical properties of these potentials by using a critical point analysis and we find solutions which lead to cosmic acceleration and under specific conditions we can have de-Sitter points as stable late-time attractors.

  19. The Symbolism in the Moby Dick

    Institute of Scientific and Technical Information of China (English)

    孙婷

    2012-01-01

    Moby Dick,written by Herman Melville,is considered to be one of the greatest American Novels and a treasure of world literature.In this book,Melville uses a lot of symbols.If the readers do not understand the symbolism of this book,they will have many difficulties to grasp the complex theme of it.Here,I'd like to analyze the symbolism of the some main characters and objects,simply to help readers understand the themes:the concepts of class and social status,good and evil,the existence of God and the struggl...

  20. Gravitation and the earth sciences: the contributions of Robert Dicke

    CERN Document Server

    Kragh, Helge

    2015-01-01

    The American physicist Robert Dicke (1916-1997) is primarily known for his important contributions to gravitation, cosmology, and microwave physics. Much less known is his work in geophysics and related areas of the earth sciences in which he engaged himself and several of his collaborators in the period from about 1957 to 1969. Much of Dicke's work in geophysics was motivated by his wish to obtain evidence in support of the non-Einstenian Brans-Dicke theory of gravitation. The idea of a decreasing gravitational constant, as entertained by Dicke and some other physicists (including Pascual Jordan), played some role in the process that transformed the static picture of the Earth to a dynamical picture. It is not by accident that Dicke appears as a minor actor in histories of the plate tectonic revolution in the 1960s.

  1. Generation and classification of robust remote symmetric Dicke states

    Institute of Scientific and Technical Information of China (English)

    Zhu Yan-Wu; Gao Ke-Lin

    2008-01-01

    In this paper,we present an approach to generating arbitrary symmetric Dicke states with distant trapped ions and linear optics.Distant trapped ions can be prepared in the symmetric Dicke states by using two photon-number-resolving detectors and a polarization beam splitter.The atomic symmetric Dicke states are robust against decoherence,for atoms are in a metastable level.We discuss the experimental feasibility of our scheme with current technology.Finally,we discuss the classification of arbitrary n-qubit symmetric Dicke states under statistical local operation and classical communication and prove the existence of[n/2]inequivalent classes of genuine entanglement of n-qubit symmetric Dicke states.

  2. A History of the Andrew File System

    CERN Document Server

    CERN. Geneva; Altman, Jeffrey

    2011-01-01

    Derrick Brashear and Jeffrey Altman will present a technical history of the evolution of Andrew File System starting with the early days of the Andrew Project at Carnegie Mellon through the commercialization by Transarc Corporation and IBM and a decade of OpenAFS. The talk will be technical with a focus on the various decisions and implementation trade-offs that were made over the course of AFS versions 1 through 4, the development of the Distributed Computing Environment Distributed File System (DCE DFS), and the course of the OpenAFS development community. The speakers will also discuss the various AFS branches developed at the University of Michigan, Massachusetts Institute of Technology and Carnegie Mellon University.

  3. Composite vacuum Brans-Dicke wormholes

    CERN Document Server

    Sushkov, Sergey V

    2011-01-01

    We construct a new static spherically symmetric configuration composed of interior and exterior Brans-Dicke vacua matched at a thin matter shell. Both vacua correspond to the same Brans-Dicke coupling parameter $\\omega$, however they are described by the Brans class I solution with different sets of parameters of integration. In particular, the exterior vacuum solution has $C_{ext}(\\omega)\\equiv 0$. In this case the Brans class I solution for any $\\omega$ reduces to the Schwarzschild one being consistent with restrictions on the post-Newtonian parameters following from recent Cassini data. The interior region possesses a strong gravitational field, and so the interior vacuum solution has $C_{int}(\\omega)=-1/(\\omega+2)$. In this case the Brans class I solution describes a wormhole spacetime provided $\\omega$ lies in the narrow interval $-2-\\frac{\\sqrt{3}}{3}<\\omega<-2$. The interior and exterior regions are matched at a thin shell made from an ordinary perfect fluid with positive energy density and press...

  4. On the Chameleon Brans-Dicke Cosmology

    CERN Document Server

    Bisabr, Yousef

    2012-01-01

    We consider a generalized Brans-Dicke model in which the scalar field has a potential function and is also allowed to couple non-minimally with the matter sector. We assume a power law form for the potential and the coupling functions as the inputs of the model and show that acceleration of the universe can be realized for a constrained range of exponent of the potential function. We also argue that this accelerating phase is consistent with a large and positive Brans-Dicke parameter. In our analysis, the potential plays a more important role with respect to the coupling function in dynamics of the universe as the latter does not contribute to any of the relations characterizing evolution of scale factor of the universe and the scalar field. However, we will show that the coupling function is closely related to magnitude and direction of the energy transfer between matter and the scale field. We use this fact and some thermodynamic aspects of the model to put some constraints on the coupling function. In part...

  5. Critical behavior in the Brans-Dicke theory of gravitation

    CERN Document Server

    Chiba, T; Chiba, Takeshi; Soda, Jiro

    1996-01-01

    The collapse of a massless scalar field in the Brans-Dicke theory of gravitation is studied in the analysis of both analytical solution and numerical one. By conformally transforming the Roberts's solution into the Brans-Dicke frame, we find for \\omega > -3/2 that a continuous self-similarity continues and that the critical exponent does depend on \\omega. By conformally transforming the Choptuik's solution into the Brans-Dicke frame, we find for \\omega > -3/2 that at the critical solution shows discrete self-similarity, however, the critical exponent depends strongly on \\omega while the echoing parameter weakly on it.

  6. Jordan-Brans-Dicke stochastic inflation

    CERN Document Server

    García-Bellido, J

    1994-01-01

    We study stochastic inflation in the presence of a dynamical gravitational constant. We describe the Arnowitt--Deser--Misner formalism for Jordan--Brans--Dicke theory of gravity with an inflaton field. The inflaton and dilaton scalar fields can be separated into coarse-grained background fields and quantum fluctuations. We compute the amplitude of the perturbations generated by those quantum fluctuations in JBD theory with an arbitrary potential for the inflaton field. The effect of the quantum fluctuations on the background fields is equivalent to a Brownian motion of the scalar fields, which can be described with the use of a Fokker--Planck diffusion equation. The probability to find a given value of the fields in the comoving frame can be written as a Gaussian distribution centered on their classical trajectory, with decreasing dispersion along both field directions. We also calculate the condition for the Universe to enter a self-regenerating inflationary phase. The probability distribution in the physica...

  7. Optimized entanglement witnesses for Dicke states

    Energy Technology Data Exchange (ETDEWEB)

    Bergmann, Marcel; Guehne, Otfried [Naturwissenschaftlich-Technische Fakultaet, Universitaet Siegen, Department Physik, Walter-Flex-Strasse 3, D-57068 Siegen (Germany)

    2013-07-01

    Quantum entanglement is an important resource for applications in quantum information processing like quantum teleportation and cryptography. Moreover, the number of particles that can be entangled experimentally using polarized photons or ion traps has been significantly enlarged. Therefore, criteria to decide the question whether a given multi-particle state is entangled or not have to be improved. Our approach to this problem uses the notion of PPT mixtures which form an approximation to the set of bi-separable states. With this method, entanglement witnesses can be obtained in a natural manner via linear semi-definite programming. In our contribution, we will present analytical results for entanglement witnesses for Dicke states. This allows to overcome the limitations of convex optimization.

  8. Generalized Brans-Dicke inflation with a quartic potential

    CERN Document Server

    Tahmasebzadeh, Behzad

    2016-01-01

    Within the framework of Brans-Dicke gravity, we investigate inflation with a quartic potential, $\\lambda\\varphi^4/4$, in the presence of generalized Brans-Dicke parameter $\\omega_{\\rm GBD}(\\varphi)$. We obtain the inflationary observables containing the scalar spectral index, the tensor-to-scalar ratio, the running of the scalar spectral index and the equilateral non-Gaussianity parameter in terms of general form of the potential $U(\\varphi)$ and $\\omega_{\\rm GBD}(\\varphi)$. For the quartic potential, our results show that the predictions of the model are in well agreement with the Planck 2015 data for the generalized Brans-Dicke parameters $\\omega_{\\rm GBD}(\\varphi)=\\omega_0\\varphi^{n}$ and $\\omega_0e^{b\\varphi}$. This is in contrast with both the Einstein and standard Brans-Dicke gravity, in which the result of quartic potential is disfavored by the Planck data.

  9. Herman Melville’s Nature Views in Moby Dick

    Institute of Scientific and Technical Information of China (English)

    Sun Gengmei; Yao Kun

    2015-01-01

    In Moby Dick, Melvil e presents his basic idea of nature view. Human beings are capable of improving their living environment, but can not overcome nature. Man lives under the mercy of nature, and is destined to doom.

  10. Treatment for Fracture of Thoracolumbar Vertebrae with Dick Nail%Dick 钉治疗胸腰椎骨折

    Institute of Scientific and Technical Information of China (English)

    王法; 马昕; 谢爱国; 丁海蛟

    2001-01-01

    目的探讨 Dick 钉治疗胸、腰椎骨折的疗效。方法应用 Dick 钉治疗胸、腰椎骨折 40 例(伴有神经损伤 13 例)。结果椎体前缘高度由术前的 50.7 % 恢复至术后的 82.6 %,中柱突入椎管内程度由术前的 30.0 % 下降至术后的 7.6 %,神经功能和疼痛程度也有不同程度的恢复。结论 Dick 钉是治疗胸、腰椎骨折的有效方法之一。%Objective To explore the therapeutic effect of dick nail in treatment of fracture of thoracolumbar vertebrae.Methods Dick nails were used in the treatment of 40 such cases (13 cases with nervous injury).Results The height of anterior margin of vertebral body was restored from 50.7%(preoperation) to 82.6%(postoperation).The degree for the middle spine to project into the vertebral canal was reduced from 30.0%(preoperation) to 7.6%(postopeation)with nervous function recovered and pain relieved.Conclusion Dick nail is one of the effective methods for treatment of fracture of thoracolumbar vertebrae.

  11. Cosmological constraint on Brans-Dicke Model

    CERN Document Server

    Li, Ji-Xia; Li, Yi-Chao; Gong, Yan; Chen, Xue-Lei

    2015-01-01

    We combine new Cosmic Microwave Background (CMB) data from Planck with Baryon Acoustic Oscillation (BAO) data to constrain the Brans-Dicke (BD) theory, in which the gravitational constant $G$ evolves with time. Observations of type Ia supernovae (SNeIa) provide another important set of cosmological data, as they may be regarded as standard candles after some empirical corrections. However, in theories that include modified gravity like the BD theory, there is some risk and complication when using the SNIa data because their luminosity may depend on $G$. In this paper, we assume a power law relation between the SNIa luminosity and $G$, but treat the power index as a free parameter. We then test whether the difference in distances measured with SNIa data and BAO data can be reduced in such a model. We also constrain the BD theory and cosmological parameters by making a global fit with the CMB, BAO and SNIa data set. For the CMB+BAO+SNIa data set, we find $0.08\\times10^{-2} < \\zeta <0.33\\times10^{-2} $ at ...

  12. Andrew Fielding Huxley生平简介

    Institute of Scientific and Technical Information of China (English)

    罗层; 陈军

    2004-01-01

    Andrew Fielding Huxley1917年11月22日出生于伦敦的Hampstead。他的父亲名叫Leonard Huxley,是19世纪的科学家和作家Thomas Huxley的儿子。父亲曾是Charterhouse学校的古典文学教师,后来又从事文学创作,著有很多传记同时兼任《Cornhill》杂志的编辑,他和前妻生有两个孩子,名叫Julian Huxley和Aldous Huxley,分别是生物学家和作家。前妻死后,父亲就与Rosalind Bruce结合。

  13. Conformal relativity versus Brans-Dicke and superstring theories

    CERN Document Server

    Blaschke, D; Blaschke, David; Dabrowski, Mariusz P

    2004-01-01

    Conformal relativity theory which is also known as Hoyle-Narlikar theory has recently been given some new interest. It is an extended relativity theory which is invariant with respect to conformal transformations of the metric. In this paper we show how conformal relativity is related to the Brans-Dicke theory and to the low-energy-effective superstring theory. We show that conformal relativity action is equaivalent to a transformed Brans-Dicke action for Brans-Dicke parameter $\\omega = -3/2$ in contrast to a reduced (graviton-dilaton) low-energy-effective superstring action which corresponds to a Brans-Dicke action with Brans-Dicke parameter $\\omega = -1$. We also present basic cosmological solutions of conformal relativity in both Einstein and string frames. The Eintein limit for flat conformal cosmology solutions is unique and it is flat Minkowski space. This requires the scalar field/mass evolution instead of the scale factor evolution in order to explain cosmological redshift. It is interesting that like...

  14. Dick Jewell’s Found Photos

    Directory of Open Access Journals (Sweden)

    Ian Walker

    2010-12-01

    Full Text Available

    Abstract (E:

    In 1977, the young British artist Dick Jewell self-published a small book Found Photos, a collection of photobooth images that had been thrown away or torn up by the people in the photos. This essay places that book in the context of the development of interest in vernacular photography during the 1970s, and relates it to other projects using pictures made in photobooths, both before and since.

     

    Abstract (F:

    Aspects of a supersymmetric Brans-Dicke theory

    Energy Technology Data Exchange (ETDEWEB)

    Catena, R.

    2006-11-15

    We consider a locally supersymmetric theory where the Planck mass is replaced by a dynamical superfield. This model can be thought of as the Minimal Supersymmetric extension of the Brans-Dicke theory (MSBD). The motivation that underlies this analysis is the research of possible connections between Dark Energy models based on Brans-Dicke-like theories and supersymmetric Dark Matter scenarios. We find that the phenomenology associated with the MSBD model is very different compared to the one of the original Brans-Dicke theory: the new scalar and fermionic degrees of freedom do not couple to matter in a universal metric way, i.e. they can not be removed from the matter sector by a Weyl rescaling of the metric. This feature could make the minimal supersymmetric extension of the BD idea phenomenologically inconsistent. (orig.)

  15. On Stationary Axially Symmetric Solutions in Brans-Dicke Theory

    CERN Document Server

    Kirezli, Pınar

    2015-01-01

    Stationary axially symmetric Brans-Dicke-Maxwell solutions are re-examined in the framework of the Brans-Dicke theory. We see that, employing a particular parametrization of the standard axially symmetric metric simplifies the procedure of obtaining the Ernst equations for axially symmetric electro-vacuum space-times for this theory. This analysis also permit us to construct a two parameter extension in both Jordan and Einstein frames of an old solution generating technique frequently used to construct axially symmetric solutions for Brans-Dicke theory from a seed solution of General Relativity. As applications of this technique, several known and new solutions are constructed including a general axially symmetric BD-Maxwell solution of Plebanski-Demianski with vanishing cosmological constant, i.e. the Kinnersley solution and general magnetized Kerr-Newman type solutions. Some physical properties and circular motion of test particles for a particular subclass of Kinnersley solution, i.e. Kerr-Newman-NUT type ...

  16. Relationship between Humans and Nature in Melville's Moby Dick

    Institute of Scientific and Technical Information of China (English)

    余奕汶

    2015-01-01

    Herman Melville,with Moby Dick as his masterpiece,is a famous romantic writer.Moby Dick is a"bright pearl" in the literary treasury of the world.By allegorically depicting the cruel killing of whales by the Captain Ahab and other sailors in his whaling ship,and their tragically being drowned in the sea,the writer reveals that if humans are too self-centered,we will inevitably be punished by nature.Start with the three states that humans get along with nature in Moby Dick,my thesis aims at exploring the transformations of the relationship between humans and nature as well as the edification that humans may gain from the tragic story.

  17. Every Tom,Dick and Harry的含义

    Institute of Scientific and Technical Information of China (English)

    霍秀梅

    2013-01-01

    一大早,同事就来抱怨:“我本想办一个小型的私人聚会,没想到老婆把该请的、不该请的全请来了!”如何用英语来表达“该请的和不该请的”?看好了:“Every Tom,Dick and Harry”。这里的“Tom,Dick and Harry”,泛指普通人,但含有蔑视意,特指“非常非常一般、毫无半点建树的普通人”,如:Every Tom,Dick and Harry is qualified to do the job.(这活儿谁都能干!)

  18. New views on classical and quantum Brans-Dicke theory

    CERN Document Server

    Fabris, Júlio C; Rodrigues, Davi C; Almeida, Carla R; Piattella, Oliver F

    2016-01-01

    The Brans-Dicke action is one of the most natural extensions of the Einstein-Hilbert action. It is based on the introduction of a fundamental scalar field that effectively incorporates a dynamics to the gravitational coupling $G$. In spite of the diverse motivations and the rich phenomenology that comes from its solutions, Solar System tests impose strong constraints on the Brans-Dicke theory, rendering it indistinguishable from General Relativity. In the present text, new perspectives for the Brans-Dicke theory are presented, based on the possibility that the scalar field presented in the BD theory can be external, as well as on the applications to black hole physics and the primordial universe.

  19. Conformal Relativity versus Brans–Dicke and Superstring Theories

    Directory of Open Access Journals (Sweden)

    David B. Blaschke

    2012-10-01

    Full Text Available We show how conformal relativity is related to Brans–Dicke theory and to low-energy-effective superstring theory. Conformal relativity or the Hoyle–Narlikar theory is invariant with respect to conformal transformations of the metric. We show that the conformal relativity action is equivalent to the transformed Brans–Dicke action for ω = -3/2 (which is the border between standard scalar field and ghost in contrast to the reduced (graviton-dilaton low-energy-effective superstring action which corresponds to the Brans–Dicke action with ω = -1. We show that like in ekpyrotic/cyclic models, the transition through the singularity in conformal cosmology in the string frame takes place in the weak coupling regime. We also find interesting self-duality and duality relations for the graviton-dilaton actions.

  1. Level statistics of a pseudo-Hermitian Dicke model.

    Science.gov (United States)

    Deguchi, Tetsuo; Ghosh, Pijush K; Kudo, Kazue

    2009-08-01

    A non-Hermitian operator that is related to its adjoint through a similarity transformation is defined as a pseudo-Hermitian operator. We study the level statistics of a pseudo-Hermitian Dicke Hamiltonian that undergoes quantum phase transition (QPT). We find that the level-spacing distribution of this Hamiltonian near the integrable limit is close to Poisson distribution, while it is Wigner distribution for the ranges of the parameters for which the Hamiltonian is nonintegrable. We show that the assertion in the context of the standard Dicke model that QPT is a precursor to a change in the level statistics is not valid in general.

  2. Pairwise Quantum Correlations for Superpositions of Dicke States

    Institute of Scientific and Technical Information of China (English)

    席政军; 熊恒娜; 李永明; 王晓光

    2012-01-01

    Pairwise correlation is really an important property for multi-qubit states.For the two-qubit X states extracted from Dicke states and their superposition states,we obtain a compact expression of the quantum discord by numerical check.We then apply the expression to discuss the quantum correlation of the reduced two-qubit states of Dicke states and their superpositions,and the results are compared with those obtained by entanglement of formation,which is a quantum entanglement measure.

  3. Holographic Principle of Black Holes in Brans-Dicke Theory

    CERN Document Server

    Chen, C Y; Chen, Chi-Yi; Shen, You-Gen

    2003-01-01

    We consider the general situation of type-I stationary solutions of black holes in Brans-Dicke theory and investigate their statistical entropies by using the brick wall model. Compare with a generalized entropy formula derived from their thermodynamical evolution by Kang, We get the ultimate scenario of black holes entropies in Brans-Dicke theory. For further considering the bound of holographic principle, we obtain a new constraint on parameters in this type solution read as $2Q-\\chi=2$, which corresponds to $\\omega=-{3/2}$.

  4. Negative Correlations and Entanglement in Higher-Spin Dicke States

    Science.gov (United States)

    Wang, Xiaoqian; Zhong, Wei; Wang, Xiaoguang

    2016-10-01

    We consider entanglement criteria based on the spin squeezing inequalities for arbitrary spin systems. Here we use the negative correlations to detect the entanglement in the system with exchange symmetry. For arbitrary spin systems, we can find that the state is entangled, when the minimal pairwise correlation is negative. Then we give a parameter which is defined by the collective angular momentum operator, to detect the entanglement for the Dicke state with N spin -1 particles, and the results are as the same as negative correlation. We also consider the directions of negative correlation, the state is entangled in two orthogonal directions for the superposition of Dicke state without parity.

  5. Inflation and dark energy from the Brans-Dicke theory

    Energy Technology Data Exchange (ETDEWEB)

    Artymowski, Michał [Institute of Physics, Jagiellonian UniversityŁojasiewicza 11, 30-348 Kraków (Poland); Lalak, Zygmunt; Lewicki, Marek [Institute of Theoretical Physics, Faculty of Physics, University of Warsawul. Pasteura 5, 02-093 Warszawa (Poland)

    2015-06-17

    We consider the Brans-Dicke theory motivated by the f(R)=R+αR{sup n}−βR{sup 2−n} model to obtain a stable minimum of the Einstein frame scalar potential of the Brans-Dicke field. As a result we have obtained an inflationary scalar potential with non-zero value of residual vacuum energy, which may be a source of dark energy. In addition we discuss the probability of quantum tunnelling from the minimum of the potential. Our results can be easily consistent with PLANCK or BICEP2 data for appropriate choices of the value of n and ω.

  6. The Characters of the Captain Ahab in Moby Dick

    Institute of Scientific and Technical Information of China (English)

    李哲慧

    2013-01-01

    Captain Ahab is a controversy and complicated figure in Moby Dick. The studies of Ahab in the past has become in-creasingly involved various aspects. Ahab is a figure with many faces, among which the most significant and decisive ones are his individualist, arrogance and humanity. He persists in taking revenging on the white whale is quite compatible with such charac-ter. Besides, his fate is also leads to his attachment behavior. In this essay ,I will mainly analyze the fate and characters of Ahab in order to help readers understand Moby Dick better.

  7. Environmental Contaminants Evaluation of St. Andrew Bay, Florida: Volume 1

    Data.gov (United States)

    US Fish and Wildlife Service, Department of the Interior — Between 1985 and 1997, a general survey of St. Andrew Bay, Florida, was conducted to measure chemical contaminant concentrations in the sediments and selected biota....

  8. Parcels and Land Ownership, Published in 2011, Andrew County Government.

    Data.gov (United States)

    NSGIC GIS Inventory (aka Ramona) — This Parcels and Land Ownership dataset as of 2011. The extent of these data is generally Andrew County, MO. This metadata was auto-generated through the Ramona GIS...

  9. Vacuum less global monopole in Brans-Dicke theory

    CERN Document Server

    Rahaman, F; Kalam, M; Mukherjee, R; Roy, T

    2007-01-01

    In the present work, the gravitational field of a vacuum less global monopole has been investigated in Brans-Dicke theory under weak field assumption of the field equations. It has been shown that the vacuum less global monopole exerts attractive gravitational effects on a test particle. It is dissimilar to the case studied in general relativity.

  10. Composite spherically symmetric configurations in Jordan-Brans-Dicke theory

    CERN Document Server

    Kozyrev, S

    2010-01-01

    In this article, a study of the scalar field shells in relativistic spherically symmetric configurations has been performed. We construct the composite solution of Jordan-Brans-Dicke field equation by matching the conformal Brans solutions at each junction surfaces. This approach allows us to associate rigorously with all solutions as a single glued "space", which is a unique differentiable manifold M^4.

  11. Cosmological Evolution of Black Holes in Brans-Dicke Gravity

    CERN Document Server

    Sakai, N; Sakai, Nobuyuki; Barrow, John D.

    2001-01-01

    We consider a modified ``Swiss cheese'' model in Brans-Dicke theory, and use it to discuss the evolution of black holes in an expanding universe. We define the black hole radius by the Misner-Sharp mass and find their exact time evolutions for dust and vacuum universes of all curvatures.

  12. Evolution of Black Holes in Brans-Dicke Cosmology

    CERN Document Server

    Sakai, N; Sakai, Nobuyuki; Barrow, John D.

    2000-01-01

    We consider a modified ``Swiss cheese'' model in the Brans-Dicke theory, and discuss the evolution of black holes in the expanding universe. We define the black hole radius by the Misner-Sharp mass and find the time evolution for dust and vacuum universes.

  13. Cosmological evolution of black holes in Brans-Dicke gravity

    Science.gov (United States)

    Sakai, Nobuyuki; Barrow, John D.

    2001-11-01

    We consider a modified 'Swiss cheese' model in the Brans-Dicke theory and use it to discuss the evolution of black holes in an expanding universe. We define the black hole radius by the Misner-Sharp mass and find the exact time evolutions for dust and vacuum universes of all curvatures.

  14. Brans–Dicke gravity theory from topological gravity

    Energy Technology Data Exchange (ETDEWEB)

    Inostroza, C.; Salazar, A.; Salgado, P.

    2014-06-27

    We consider a model that suggests a mechanism by which the four dimensional Brans–Dicke gravity theory may emerge from the topological gravity action. To achieve this goal, both the Lie algebra and the symmetric invariant tensor that define the topological gravity Lagrangian are constructed by means of the Lie algebra S-expansion procedure with an appropriate abelian semigroup S.

  15. Static Generalized Brans-Dicke Universe and Gravitational Waves Amplification

    CERN Document Server

    Berman, M S; Berman, Marcelo S.; Trevisan, Luis A.

    2001-01-01

    We find a static solution for the scale-factor in a Brans-Dicke generalized theory where the scalar field and the coupling constant vary with time. We find also that in the early Universe there may be amplification of gravitational waves.

  16. Inflationary Phase in a Generalized Brans-Dicke Theory

    Science.gov (United States)

    Berman, Marcelo S.; Trevisan, Luis A.

    2009-07-01

    We find a solution for exponential inflation in a Brans-Dicke generalized model, where the coupling “constant” is variable. While in General Relativity the equation of state is p=- ρ, here we find p= α ρ, where α<-2/3. The negativity of cosmic pressure implies acceleration of the expansion, even with Λ<0.

  17. Minimizing energy consumption for wireless computers in Moby Dick

    NARCIS (Netherlands)

    Havinga, Paul J.M.; Smit, Gerard J.M.

    1997-01-01

    The Moby Dick project is a joint European project to develop and define the architecture of a new generation of mobile hand-held computers, called Pocket Companions. The Pocket Companion is a hand-held device that is resource-poor, i.e. small amount of memory, limited battery life, low processing po

  18. Dynamical squeezing enhancement in the off-resonant Dicke model

    Energy Technology Data Exchange (ETDEWEB)

    Shindo, D; Chavez, A; Chumakov, S M; Klimov, A B [Departamento de FIsica, Universidad de Guadalajara, Revolucion 1500, 44420, Guadalajara, Jalisco (Mexico)

    2004-01-01

    We show that the maximum atomic squeezing that can be achieved in the vacuum off-resonant Dicke model (governed by the effective Hamiltonian {approx} S{sub z}{sup 2}) can be essentially enhanced by applying a sequence of {pi}/2 pulses at certain time moments. The major effect is obtained after the first pulse.

  19. General class of vacuum Brans-Dicke wormholes

    CERN Document Server

    Lobo, Francisco S N

    2010-01-01

    Recently, traversable wormhole geometries were constructed in the context of f(R) gravity. The latter is equivalent to a Brans-Dicke theory with a coupling parameter w=0, which is apparently excluded from the narrow interval, -3/2Dicke theory. However, this latter interval is only valid for a specific choice of an integration constant of the field equations derived on the basis of a post-Newtonian weak field approximation, and there is no reason for it to hold in the presence of compact objects with strong gravitational fields. In this context, we construct a general class of vacuum Brans-Dicke wormholes that include the value of w=0. Furthermore, we present the general condition for the existence of vacuum Brans-Dicke wormhole geometries, and show that the presence of effective negative energy densities is a generic feature of these vacuum solutions.

  20. Minimizing energy consumption for wireless computers in Moby Dick

    NARCIS (Netherlands)

    Havinga, Paul J.M.; Smit, Gerardus Johannes Maria

    1997-01-01

    The Moby Dick project is a joint European project to develop and define the architecture of a new generation of mobile hand-held computers, called Pocket Companions. The Pocket Companion is a hand-held device that is resource-poor, i.e. small amount of memory, limited battery life, low processing

  1. Author! Author! The Gallant Children's Author: Dick King-Smith

    Science.gov (United States)

    Brodie, Carolyn S.

    2005-01-01

    This column presents a brief biography of Dick King-Smith. Born on March 27, 1922 and raised in Gloucestershire, England, he grew up with animals of all kinds. King-Smith was a farmer for twenty years and then became a school teacher. He was also a soldier during wartime, a traveling salesman, shoe factory worker, and television presenter. He…

  2. Ahab——The main Character in Moby-dick

    Institute of Scientific and Technical Information of China (English)

    佟玉平

    2007-01-01

    Herman Melville is not only a great Romanticist in the American literary history but also an influential figure in the world.Moby--dick,which was published in 1851,is his representative work..This thesis focus on the analysis of the character of the hero--the captain Ahab from three aspects:his pride,his madness,his humanity.

  3. Dick receives 2011 Harry H. Hess Medal: Citation

    Science.gov (United States)

    Niu, Yaoling

    2012-01-01

    Henry J. B. Dick was awarded the 2011 Harry H. Hess Medal at the AGU Fall Meeting Honors Ceremony, held on 7 December 2011 in San Francisco, Calif. The medal is for "outstanding achievements in research on the constitution and evolution of Earth and other planets."

  4. Dick receives 2011 Harry H. Hess Medal: Response

    Science.gov (United States)

    Dick, Henry J. B.

    2012-01-01

    Henry J. B. Dick was awarded the 2011 Harry H. Hess Medal at the AGU Fall Meeting Honors Ceremony, held on 7 December 2011 in San Francisco, Calif. The medal is for "outstanding achievements in research on the constitution and evolution of Earth and other planets."

  5. Using Herman Melville's "Moby-Dick" to Explore Geographic Themes

    Science.gov (United States)

    Gesler, Wil

    2004-01-01

    The classic American novel, Herman Melville's "Moby-Dick", can be used in geography and English classes at the high school and college levels to explore five themes that have a geographic component or are of interest to geography students: (1) the journey, (2) human/environment interactions, (3) social relationships in space, (4) acquiring…

  6. The Dick and Carey Model: Will It Survive the Decade?

    Science.gov (United States)

    Dick, Walter

    1996-01-01

    Reviews changes in the original Dick and Carey model of instructional design and considers its future usefulness. Topics include alternative instructional design textbooks, the influence of constructivist theory on the 1996 version of the model with its systems approach, and the influence of constructivist and objectivist models. (Author/LRW)

  7. Interview: Professor Andrew Feinberg speaks to Epigenomics.

    Science.gov (United States)

    Feinberg, Andrew

    2009-10-01

    Andrew Feinberg studied mathematics and humanities at Yale University (CT, USA) in the Directed Studies honors program, and he received his BA (1973) and MD (1976) from the accelerated medical program at Johns Hopkins University (MD, USA), as well as an MPH from Johns Hopkins (1981). He performed a postdoctoral fellowship in developmental biology at the University of California, San Diego (UCSD, CA, USA), clinical training in medicine and medical genetics at the University of Pennsylvania (PA, USA) and genetics research with Bert Vogelstein at Johns Hopkins, discovering altered DNA methylation in human cancer. Dr Feinberg continued to perform seminal work in cancer epigenetics as a Howard Hughes investigator at the University of Michigan (MI, USA), discovering human imprinted genes and loss of imprinting in cancer, and the molecular basis of Beckwith-Wiedemann syndrome. He returned to John Hopkins in 1994 as King Fahd Professor of Medicine, Molecular Biology & Genetics and Oncology, and he holds an Adjunct Professorship at the Karolinska Institute in Sweden. Dr Feinberg is Director of the Center for Epigenetics, a National Human Genome Research Institute-designated Center of Excellence in Genome Sciences. The Center is pioneering genome-scale tools in molecular, statistical and epidemiological epigenetics, and is applying them to the study of cancer, neuropsychiatric disease and aging. As part of the center, Dr Feinberg has organized a highly innovative program to bring gifted minority high-school students into genetics and genomics. Dr Feinberg has also invented a number of widely used molecular tools, including random priming. His honors include election to the American Society for Clinical Investigation, the Association of American Physicians, the Institute of Medicine of the National Academy of Sciences, and the American Academy of Arts and Sciences, as well as membership on the ISI most-cited authors list, a MERIT Award of the National Cancer Institute, a

  8. Andrew Smith: peame leidma tee majanduskasvuni, mis põhineb säästmisel, investeeringutel ja ekspordil / Andrew Smith

    Index Scriptorium Estoniae

    Smith, Andrew

    2010-01-01

    KPMG (UK) peaökonomist Andrew Smith vastab küsimustele, mis puudutavad majanduskriisi tekkimist, olukorra paranemist, majandusolukorda Suurbritannias, erinevusi Euroopa ja muude maailma piirkondade vahel, sarnasusi Eesti ja Suurbritannia majandusolukorra vahel ning prognoose edaspidiste arengute osas

  9. Andrew Smith: peame leidma tee majanduskasvuni, mis põhineb säästmisel, investeeringutel ja ekspordil / Andrew Smith

    Index Scriptorium Estoniae

    Smith, Andrew

    2010-01-01

    KPMG (UK) peaökonomist Andrew Smith vastab küsimustele, mis puudutavad majanduskriisi tekkimist, olukorra paranemist, majandusolukorda Suurbritannias, erinevusi Euroopa ja muude maailma piirkondade vahel, sarnasusi Eesti ja Suurbritannia majandusolukorra vahel ning prognoose edaspidiste arengute osas

  10. Preparation of Dicke States in an Ion Chain

    CERN Document Server

    Hume, D B; Rosenband, T; Wineland, D J

    2009-01-01

    We have investigated theoretically and experimentally a method for preparing Dicke states in trapped atomic ions. We consider a linear chain of $N$ ion qubits that is prepared in a particular Fock state of motion, $|m>$. The $m$ phonons are removed by applying a laser pulse globally to the $N$ qubits, and converting the motional excitation to $m$ flipped spins. The global nature of this pulse ensures that the $m$ flipped spins are shared by all the target ions in a state that is a close approximation to the Dicke state $\\D{N}{m}$. We calculate numerically the fidelity limits of the protocol and find small deviations from the ideal state for $m = 1$ and $m = 2$. We have demonstrated the basic features of this protocol by preparing the state $\\D{2}{1}$ in two $^{25}$Mg$^+$ target ions trapped simultaneously with an $^{27}$Al$^+$ ancillary ion.

  11. Preparation of Dicke states in an ion chain

    Science.gov (United States)

    Hume, D. B.; Chou, C. W.; Rosenband, T.; Wineland, D. J.

    2009-11-01

    We have investigated theoretically and experimentally a method for preparing Dicke states in trapped atomic ions. We consider a linear chain of N ion qubits that is prepared in a particular Fock state of motion |m⟩ . The m phonons are removed by applying a laser pulse globally to the N qubits and converting the motional excitation to m flipped spins. The global nature of this pulse ensures that the m flipped spins are shared by all the target ions in a state that is a close approximation to the Dicke state |DN(m)⟩ . We calculate numerically the fidelity limits of the protocol and find small deviations from the ideal state for m=1 and m=2 . We have demonstrated the basic features of this protocol by preparing the Bell state |D2(1)⟩ in two M25g+ target ions trapped simultaneously with an A27l+ ancillary ion.

  12. Pairwise Quantum Correlations for Superpositions of Dicke States

    CERN Document Server

    Xi, Zhengjun; Li, Yongming; Wang, Xiaoguang

    2011-01-01

    Using the concept of quantum discord (QD), we study the quantum correlation for a class of two-qubit X states with exchange and parity symmetries, whose density matrices have complex off-diagonal elements. We derive an upper bound of the QD, which is independent of the arguments of the complex off-diagonal elements of the reduced two-qubit density matricies. Moreover, for the two-qubit X states obtained from Dicke states and their superposition states, we obtain a compact expression of the QD by numerical check. Finally, we apply the expression to discuss the quantum correlation of the reduced two-qubit states of Dicke states and their superpositions, and the results are compared with those obtained by entanglement of formation (EoF), which is a quantum entanglement measure.

  13. The Hero Journey of Ishmael in Moby Dick

    Institute of Scientific and Technical Information of China (English)

    郭妮

    2014-01-01

    MobyDick, a novel acclaimed as a success of nineteenth-century American fiction, has always been challenging to readers,as it can be interpreted from different perspectives. There are two Ishmaels in it:one is the character and the other is the narrator.This paper studies the hero journey of Ishmael from the perspective of hero motif.Through the analysis of the differences between the two Ishmaels---the changes take place in younger Ishmael after his quest on the sea,the hero journey of Ishmael is presented.The paper concludes that Moby Dick suggests the hidden terror of nineteenth century America and people’s concern about the spiritual freedom.

  14. Unified dark fluid in Brans-Dicke theory

    Energy Technology Data Exchange (ETDEWEB)

    Tripathy, Sunil K. [Indira Gandhi Institute of Technology, Department of Physics, Dhenkanal, Odisha (India); Behera, Dipanjali [Government College of Engineering, Department of Physics, Kalahandi, Odisha (India); Mishra, Bivudutta [Birla Institute of Technology and Science-Pilani, Department of Mathematics, Hyderabad (India)

    2015-04-01

    Anisotropic dark energy cosmological models are constructed in the frame work of generalised Brans-Dicke theory with a self-interacting potential. A unified dark fluid characterised by a linear equation of state is considered as the source of dark energy. The shear scalar is considered to be proportional to the expansion scalar simulating an anisotropic relationship among the directional expansion rates. The dynamics of the universe in the presence of a unified dark fluid in anisotropic background have been discussed. The presence of an evolving scalar field makes it possible to get an accelerating phase of expansion even for a linear relationship among the directional Hubble rates. It is found that the anisotropy in expansion rates does not affect the scalar field, the self-interacting potential, but it controls the non-evolving part of the Brans-Dicke parameter. (orig.)

  15. Non-static local string in Brans–Dicke theory

    Indian Academy of Sciences (India)

    A A Sen

    2000-09-01

    A recent investigation showed that a local gauge string with a phenomenological energy momentum tensor, as prescribed by Vilenkin, is inconsistent in Brans–Dicke theory. In this work it has been shown that such a string is indeed consistent if one introduces time dependences in the metric. A set of solutions of full non-linear Einstein’s equations for the interior region of such a string are presented.

  16. New static spheroidal solution in Jordan-Brands-Dicke theory

    CERN Document Server

    Kozyrev, S M

    2010-01-01

    The static spheroidal solutions of Jordan-Brands-Dicke theory (JBD) are studied. We consider the effect of the anisotropic stresses of scalar field on the shape of JBD self-graviting objects. It is shown that scalar fields can have significant effect on the structure and properties of self-graviting objects. In contrast with general relativity in JBD theory there are nonflat static spheroidal solutions.

  17. Higher dimensional global monopole in Brans–Dicke theory

    Indian Academy of Sciences (India)

    Farook Rahaman; Subenoy Chakraborty; Mehedi Kalam

    2002-01-01

    The gravitational field of a higher dimensional global monopole in the context of Brans–Dicke theory of gravity is investigated. The space time metric and the scalar field generated by a global monopole are obtained using the weak field approximation. Finally, the geodesic of a test particle due to the gravitational field of the monopole is studied.

  18. On the Identity of Ishmael in Moby Dick

    Institute of Scientific and Technical Information of China (English)

    DU Liang-xia

    2015-01-01

    Moby Dick is a retrospective novel about life at sea as well as a vast philosophical allegory of life in general. The novel begins with a famous statement“Call me Ishmael”. The identity of Ishmael is analyzed, revealing that he functions not only as an indispensable narrator, but as an actor—a sailor on the Pequod, and psychologically a religious wonderer and a truth seeker.

  19. Antigravity in F( R) and Brans-Dicke theories

    Science.gov (United States)

    Oikonomou, V. K.; Karagiannakis, N.

    2014-12-01

    We study antigravity in F( R)-theory originating scalar-tensor theories and also in Brans-Dicke models without cosmological constant. For the F( R) theory case, we obtain the Jordan frame antigravity scalar-tensor theory by using a variant of the Lagrange multipliers method and we numerically study the time dependent effective gravitational constant. As we shall demonstrate in detail by using some viable F( R) models, although the initial F( R) models have no antigravity, their scalar-tensor counterpart theories might or not have antigravity, a fact mainly depending on the parameter that characterizes antigravity. Similar results hold true in the Brans-Dicke model, which we also studied numerically. In addition, regarding the Brans-Dicke model we also found some analytic cosmological solutions. Since antigravity is an unwanted feature in gravitational theories, our findings suggest that in the case of F( R) theories, antigravity does not occur in the real world described by the F( R) theory, but might occur in the Jordan frame scalar-tensor counterpart of the F( R) theory, and this happens under certain circumstances. The central goal of our study is to present all different cases in which antigravity might occur in modified gravity models.

  20. Obituary: Richard L. (Dick) Walker, Jr., 1938-2005

    Science.gov (United States)

    Pier, Jeffrey R.; Mason, Brian

    2005-12-01

    Dick Walker, 67, died 30 March 2005 in Flagstaff, AZ, following a long illness. He was born on 9 March 1938 in Hampton, Iowa and grew up in Waterloo, Iowa. As a child, Dick was fascinated with astronomy and built his own telescope. He saved his pennies and bought and read every book on the subject he could find. He also raised pigeons, naming four of them Hertzsprung, Hoyle, Gamow, and Kron. In 1957, the year Sputnik was launched, Dick began his college studies at the University of Northern Iowa in Cedar Falls. In 1959, he transferred to the State University of Iowa (subsequently renamed the University of Iowa) in Iowa City, where he earned a BA degree in astronomy and physics in 1963. He joined the staff of the U.S. Naval Observatory in Washington, DC, where he worked in the Time Service Division for a year before his assignment to the Astrometry and Astrophysics Division. Dick relocated to Flagstaff, AZ, in 1966 to continue his Naval Observatory service at the Flagstaff Station. His retirement in May 1999, ended a thirty-six-year career with USNO. Dick was first and foremost an observational astronomer. From the mid 1960s through the late 1970s, much of Dick's time was devoted to the measurement of binary stars, observing with the 12-inch and 26-inch refractors in Washington and later the 40-inch and 61-inch reflectors in Flagstaff. He also made many trips to Lick Observatory to work with the 36-inch Clark Refractor there. During this time he consulted with Charles Worley, who was observing on the 26-inch, to make sure time was well-spent examining doubles that could not be observed in Washington. This period of observing overlapped with the early years of speckle interferometry, and Dick's observations, made with the largest telescope used for micrometry at the time, were very important for ascertaining the veracity of this new technique. He was a studious and very careful observer of doubles and made over 8,000 measures, resulting in almost 3,000 mean positions

  1. Exact Cosmological Solutions in Modified Brans--Dicke Theory

    CERN Document Server

    Rasouli, S M M

    2016-01-01

    In this paper, we obtain exact cosmological vacuum solutions for an extended FLRW homogenous and isotropic Brans-Dicke (BD) universe in five dimensions for all values of the curvature index. Then, by employing the equations associated to a modified Brans-Dicke theory (MBDT) [1], we construct the physics on a four-dimensional hypersurface. We show that the induced matter obeys the equation of state of a fluid of a barotropic type. We discuss the properties of such an induced matter for some values of the equation of state parameter and analyze in detail their corresponding solutions. To illustrate the cosmological behaviors of the solutions, we contrast our solutions with those present the standard Brans-Dicke theory. We retrieve that, in MBDT scenario, it is impossible to find a physically acceptable solution associated to the negative curvature for both the dust-dominated and radiation-dominated universes. However, for a spatially flat and closed universes, we argue that our obtained solutions are more gener...

  2. Brans-Dicke Galileon and the Variational Principle

    CERN Document Server

    Quiros, Israel; Gonzalez, Tame; Horta-Rangel, F Antonio; Saavedra, Joel

    2016-01-01

    This paper is aimed at a (mostly) pedagogical exposition of the derivation of the motion equations of certain modifications of general relativity. Here we derive in all detail the motion equations in the Brans-Dicke theory with the cubic self-interaction. This is a modification of the Brans-dicke theory by the addition of a term in the Lagrangian which is non-linear in the derivatives of the scalar field: it contains second-order derivatives. This is the basis of the so-called Brans-Dicke Galileon. We pay special attention to the variational principle and to the algebraic details of the derivation. It is shown how higher order derivatives of the fields appearing in the intermediate computations cancel out leading to second order motion equations. The reader will find useful tips for the derivation of the field equations of modifications of general relativity such as the scalar-tensor theories and $f(R)$ theories, by means of the (stationary action) variational principle. The content of this paper is specially...

  3. Dicke phase transition with multiple superradiant states in quantum chaotic resonators

    KAUST Repository

    Liu, C.

    2014-06-12

    We experimentally investigate the Dicke phase transition in chaotic optical resonators realized with two-dimensional photonics crystals. This setup circumvents the constraints of the system originally investigated by Dicke and allows a detailed study of the various properties of the superradiant transition. Our experimental results, analytical prediction, and numerical modeling based on random-matrix theory demonstrate that the probability density P? of the resonance widths provides a new criterion to test the occurrence of the Dicke transition.

  4. Brans-Dicke theory of gravity with torsion: A possible solution of $\\omega$-problem

    CERN Document Server

    Wu, Yu-Huei

    2012-01-01

    We study Brans-Dicke theory of gravity in Riemann-Cartan space-times, and obtain general torsion solutions, which are completely determined by Brans-Dicke scalar field $\\Phi$, in the false vacuum energy dominated epoch. The substitution of the torsion solutions back to our action gives the original Brans-Dicke action with $\\Phi$-dependent Brans-Dicke parameter $\\omega(\\Phi)$. The evolution of $\\omega(\\Phi)$ during inflation is studied and it yields that $\\omega$ approaches to infinity at the end of inflation. It may solve the $\\omega$-problem in the extended inflation model.

  5. SWD experiment at Southwest Andrews oil field; Nansei Andrews yuden ni okeru SWD jikken

    Energy Technology Data Exchange (ETDEWEB)

    Kozawa, T.; Tsuru, T. [Japan National Oil Corp., Tokyo (Japan)

    1998-04-01

    Seismic while drilling (SWD) is an accurate drilling method by which time-to-depth (T-D) information for determining the accurate bit location and information of bedding boundaries below the bit can be obtained. However, the signal level is rather low compared with the noise generated from the rig during drilling. It is required for improving the S/N ratio to calculate a correlation using reference signals simultaneously acquired using a pilot sensor which is a geophone attached to the rig. Some experiments were conducted in the Southwest Andrews Oil Field. Deterioration of data quality due to the noise particular to the SWD in this oil field could be reduced by proper data acquisition geometry including the minimum offset distance using a geophone array. In order to correct the time, a velocity of P-wave propagating the drill pipe was estimated using auto-correlation of the pilot traces. The S/N ratio was improved by the VSP deconvolution and the stacking effect during VSP-CDP conversion. Thus, could be obtained the accurate T-D information and reflection wave information below the bit. 12 refs., 19 figs., 1 tab.

  6. Appreciating Unity in Diversity: An Interview with Andrew Solomon

    Science.gov (United States)

    Peters, Dane L.

    2014-01-01

    The theme of the AMS 2014 Annual Conference is "Unity in Diversity," a concept that also describes the work of conference keynote speaker Andrew Solomon. Solomon is a writer and lecturer on psychology and politics; winner of the National Book Award; and an activist for LGBT [lesbian, gay, bisexual, and transgender] rights, mental health,…

  7. Appreciating Unity in Diversity: An Interview with Andrew Solomon

    Science.gov (United States)

    Peters, Dane L.

    2014-01-01

    The theme of the AMS 2014 Annual Conference is "Unity in Diversity," a concept that also describes the work of conference keynote speaker Andrew Solomon. Solomon is a writer and lecturer on psychology and politics; winner of the National Book Award; and an activist for LGBT [lesbian, gay, bisexual, and transgender] rights, mental health,…

  8. General Andrew Wauchope of Niddrie Marischal. A character sketch ...

    African Journals Online (AJOL)

    cate the emotional reaction to Andrew Wau- chope's untimely death. Family background. Why was it then that upon news of his death "the name of ..... away after his body had been exhumed and ... battlefield there need be no fear that Scot-.

  9. Virasoro character identities from the Andrews-Bailey construction

    CERN Document Server

    Foda, O E; Foda, Omar; Quano, Yas Hiro

    1994-01-01

    We prove q-series identities between bosonic and fermionic representations of certain Virasoro characters. These identities include some of the conjectures made by the Stony Brook group as special cases. Our method is a direct application of Andrews' extensions of Bailey's lemma to recently obtained polynomial identities.

  10. Role of the Brans-Dicke scalar in the holographic description of dark energy

    CERN Document Server

    Kim, H L; Myung, Y S; Kim, Hungsoo

    2005-01-01

    We study cosmological application of the holographic energy density in the Brans-Dicke theory. Considering the holographic energy density as a dynamical cosmological constant, it is more natural to study it in the Brans-Dicke theory than in general relativity. Solving the Friedmann and Brans-Dicke field equations numerically, we clarify the role of Brans-Dicke field during evolution of the universe. When the Hubble horizon is taken as the IR cutoff, the equation of state ($w_{\\Lmd}$) for the holographic energy density is determined to be 5/3 when the Brans-Dicke parameter $\\omg$ goes infinity. This means that the Brans-Dicke field plays a crucial role in determining the equation of state. For the particle horizon IR cutoff, the Brans-Dicke scalar mediates a transition from $w_{\\Lmd} = -1/3$ (past) to $w_{\\Lmd} = 1/3$ (future). If a dust matter is present, it determines future equation of state. In the case of future event horizon cutoff, the role of the Brans-Dicke scalar and dust matter are turned out to be ...

  11. Dicke superradiance, Bose-Einstein condensation of photons and spontaneous symmetry breaking

    CERN Document Server

    Vyas, Vivek M; Srinivasan, V

    2016-01-01

    It is shown that the phenomenon of Dicke superradiance essentially occurs due to spontaneous symmetry breaking. Two generalised versions of the Dicke model are studied, and compared with a model that describes photonic Bose-Einstein condensate, which was experimentally realised. In all the models, it is seen that, the occurrence of spontaneous symmetry breaking is responsible for coherent radiation emission.

  12. The Symbols in" Moby- Dick" and Melville's Description of the Figures

    Institute of Scientific and Technical Information of China (English)

    康强

    2005-01-01

    When we mention Melville's masterpiece "Moby - Dick", our first impression must be the original symbols.But at the same time, most of us neglect his outstanding talent of describing the figures.In this article, we will discuss the characteristic of Melville's" Moby- Dick".

  13. An instance of sleep paralysis in Moby-Dick.

    Science.gov (United States)

    Herman, J

    1997-07-01

    It is suggested that picturesque medical conditions can, at times, be encountered in literary works composed prior to their clinical delineation. This is true of sleep paralysis, of which the first scientific description was given by Silas Weir Mitchell in 1876. A quarter of a century earlier, Herman Melville, in Moby-Dick, gave a precise account of a case, including the predisposing factors and sexual connotations, all in accord with modern theory. The details of Ishmael's attack of sleep paralysis, the stresses leading up to it, and the associations causing him to recall the experience are given here.

  14. Stellar filaments in self-interacting Brans-Dicke gravity

    Energy Technology Data Exchange (ETDEWEB)

    Sharif, M. [University of the Punjab, Department of Mathematics, Lahore (Pakistan); Manzoor, Rubab [University of the Punjab, Department of Mathematics, Lahore (Pakistan); University of Management and Technology, Department of Mathematics, Lahore (Pakistan)

    2016-05-15

    This paper is devoted to the study of the cylindrically symmetric stellar filaments in self-interacting Brans-Dicke gravity. For this purpose, we construct polytropic filamentary models through a generalized Lane-Emden equation in the Newtonian regime. The resulting models depend upon the values of the cosmological constant (due to the scalar field) along with the polytropic index and represent a generalization of the corresponding models in general relativity. We also investigate the fragmentation of the filaments by exploring the radial oscillations through a stability analysis. This stability criterion depends only upon the adiabatic index. (orig.)

  15. Brans-Dicke corrections to the gravitational Sagnac effect

    CERN Document Server

    Nandi, K K; Evans, J C; Nayak, T B

    2001-01-01

    The effect of the Brans-Dicke scalar field on the gravitational corrections to the Sagnac effect has been computed for the first time in the Jordan and Einstein frames. The calculations suggest the possibility that the presence of the scalar field can be detected directly from the basic Sagnac effect in the case of geodesic motions. A second order correction of roughly 0.1 fringe shift for visible light is introduced by the scalar field in the case of polar orbits of the source/observer. It is also demonstrated how the final results in the two frames differ.

  16. Cosmic Wave Functions with the Brans-Dicke Theory

    Institute of Scientific and Technical Information of China (English)

    ZHU Zong-Hong

    2000-01-01

    Using the standard Wentzel-Kramers-Brillouin method, the Wheeler-De Witt equation for the Brans-Dicke theory is solved under three kinds of boundary conditions (proposed by Hattie-Hawking, Vilenkin and Linde, respectively). It is found that, although the gravitational and cosmological"constants" are dynamical and timedependent in the classical models, they will acquire constant values when the universe comes from the quantum creation, and that in particular, the amplitude of the resulting wave function under Linde or Vilenkin boundary conditions reaches its maximum if the cosmological constant is the minimum.

  17. Massive motion in Brans-Dicke geometry and beyond

    CERN Document Server

    Punzi, Raffaele; Wohlfarth, Mattias N R

    2009-01-01

    Gravity theories that can be viewed as dynamics for area metric manifolds, for which Brans-Dicke theory presents a recently studied example, require for their physical interpretation the identification of the distinguished curves that serve as the trajectories of light and massive matter. Complementing previous results on the propagation of light, we study effective massive point particle motion. We show that the relevant geometrical structure is a special Finsler norm determined by the area metric, and that massive point particles follow Finsler geodesics.

  18. Stellar Filaments in Self-Interacting Brans-Dicke Gravity

    CERN Document Server

    Sharif, M

    2016-01-01

    This paper is devoted to study cylindrically symmetric stellar filaments in self-interacting Brans-Dicke gravity. For this purpose, we construct polytropic filamentary models through generalized Lane-Emden equation in Newtonian regime. The resulting models depend upon the values of cosmological constant (due to scalar field) along with polytropic index and represent a generalization of the corresponding models in general relativity. We also investigate fragmentation of filaments by exploring the radial oscillations through stability analysis. This stability criteria depends only upon the adiabatic index.

  19. Dicke-Josephson effect in a cross-typed triple-quantum-dot junction

    Science.gov (United States)

    Wang, Xiao-Qi; Yi, Guang-Yu; Gong, Wei-Jiang

    2016-12-01

    We investigate the Dicke-Josephson effect in a superconductor/triple-quantum-dot/superconductor junction in which the central dot is coupled to the superconductors. It is found that the Dicke effect can modulate the Josephson effect in a nontrivial way. In the noninteracting case, the Dicke effect induces a subpeak in the supercurrent spectrum around the energy zero point. When intradot interactions are taken into account, the role of the Dicke effect changes completely. Namely, it tends to suppress the π-phase current near the position of electron-hole symmetry. With the increase of the Coulomb strength, it has an opportunity to reverse the current direction. We thus conclude that the Dicke-Josephson effect is also an important part in describing the Josephson effect in coupled-dot junctions.

  20. A critique of phrenology in Moby-Dick.

    Science.gov (United States)

    de Souza, Leonardo Cruz; Teixeira, Antônio Lúcio; de Oliveira, Guilherme Nogueira M; Caramelli, Paulo; Cardoso, Francisco

    2017-09-05

    Phrenology has a fascinating, although controversial, place in the history of localizationism of brain and mental functions. The 2 main proponents of phrenology were 2 German-speaking doctors, Joseph Gall (1758-1828) and Johann Spurzheim (1776-1832). According to their theory, a careful examination of skull morphology could disclose personality characters. Phrenology was initially restricted to medical circles and then diffused outside scientific societies, reaching nonscientific audiences in Europe and North America. Phrenology deeply penetrated popular culture in the 19th century and its tenets can be observed in British and American literature. Here we analyze the presence of phrenologic concepts in Moby-Dick; or, The Whale, by Herman Melville (1819-1891), one of the most prominent American writers. In his masterpiece, he demonstrates that he was familiarized with Gall and Spurzheim's writings, but referred to their theory as "semi-science" and "a passing fable." Of note, Melville's fine irony against phrenology is present in his attempt to perform a phrenologic and physiognomic examination of The Whale. Thus, Moby-Dick illustrates the diffusion of phrenology in Western culture, but may also reflect Melville's skepticism and criticism toward its main precepts. © 2017 American Academy of Neurology.

  1. Robert Dicke and the Naissance of Experimental Gravity Physics

    CERN Document Server

    Peebles, P J E

    2016-01-01

    The experimental study of gravity became much more active in the late 1950s, a change pronounced enough be termed the naissance of empirical gravity physics. A review of the developments since 1915, and up to the transition to what might be termed a normal and accepted part of physical science in the late 1960s, shows the importance of advances in technologies, here as in all branches of science. The role of contingency is illustrated by Robert Dicke's decision to change directions in mid-career, to lead a research group dedicated to the experimental study of gravity. One sees the power of nonempirical evidence, which led some in the 1950s to feel that general relativity theory is so logically sound as to be scarcely worth the testing, while Dicke and others argued that a poorly tested theory is only that, and that other nonempirical arguments, based on Mach's Principle and Dirac's Large Numbers, suggested it was worth looking for a better theory of gravity. I conclude by offering lessons from this history, s...

  2. Nucleation of vacuum bubbles in Brans-Dicke type theory

    CERN Document Server

    Kim, Hongsu; Lee, Wonwoo; Lee, Young Jae; Yeom, Dong-han

    2010-01-01

    In this paper, we study nucleation of vacuum bubbles in the Brans-Dicke type theory of gravity. In the Euclidean signatures, we calculate field combinations of vacuum bubbles as solutions of Einstein and field equations as well as their probabilities by integrating the Euclidean action. We illustrate three possible ways to obtain vacuum bubbles: true vacuum bubbles for $\\omega$ > -3/2, false vacuum bubbles for $\\omega$ -3/2 when the vacuum energy of the false vacuum in the potential of the Einstein frame is less than that of the true vacuum. After the bubble is nucleated at the t = 0 surface, we can smoothly connect and match the field combinations to some solutions of the Lorentzian signatures and consistently continue their subsequent evolutions. Therefore, we conclude that, in general scalar-tensor theories or Brans-Dicke type theories, which include some models of string theory, vacuum bubbles are allowed not only in the form of true vacuum bubbles but also false vacuum bubbles, as long as a special cond...

  3. On the action of the complete Brans-Dicke theory

    Energy Technology Data Exchange (ETDEWEB)

    Kofinas, Georgios [University of the Aegean, Research Group of Geometry, Dynamical Systems and Cosmology, Department of Information and Communication Systems Engineering, Karlovassi, Samos (Greece); Tsoukalas, Minas [Bogazici University, Physics Department, Istanbul (Turkey); National Technical University of Athens, Physics Division, Athens (Greece)

    2016-12-15

    Recently the most general completion of Brans-Dicke theory has appeared with energy exchanged between the scalar field and ordinary matter, given that the equation of motion for the scalar field keeps the simple wave form of Brans-Dicke. This class of theories contain undetermined functions, but there exist only three theories which are unambiguously determined from consistency. Here, for the first such theory, the action of the vacuum theory is found, which arises as the limit of the full matter theory. A symmetry transformation of this vacuum action in the Jordan frame is found which consists of a conformal transformation of the metric together with a redefinition of the scalar field. Since the general family of vacuum theories is parametrized by an arbitrary function of the scalar field, the action of this family is also found. As for the full theory with matter the action of the system is only found when the matter Lagrangian vanishes on-shell, as for example for pressureless dust. Due to the interaction, the matter Lagrangian is non-minimally coupled either in the Jordan or the Einstein frame. (orig.)

  4. Adiabatic invariants for the regular region of the Dicke model

    Science.gov (United States)

    Bastarrachea-Magnani, M. A.; Relaño, A.; Lerma-Hernández, S.; López-del-Carpio, B.; Chávez-Carlos, J.; Hirsch, J. G.

    2017-04-01

    Adiabatic invariants for the non-integrable Dicke model are introduced. They are shown to provide approximate second integrals of motion in the energy region where the system exhibits a regular dynamics. This low-energy region, present for any set of values of the Hamiltonian parameters is described both with a semiclassical and a full quantum analysis in a broad region of the parameter space. Peres lattices in this region exhibit that many observables vary smoothly with energy, along distinct lines which beg for a formal description. It is demonstrated how the adiabatic invariants provide a rationale to their presence in many cases. They are built employing the Born–Oppenheimer approximation, valid when a fast system is coupled to a much slower one. As the Dicke model has one bosonic and one fermionic degree of freedom, two versions of the approximation are used, depending on which one is the faster. In both cases a noticeably accord with exact numerical results is obtained. The employment of the adiabatic invariants provides a simple and clear theoretical framework to study the physical phenomenology associated to these regimes, far beyond the energies where a quadratic approximation around the minimal energy configuration can be used.

  5. Frequency comparison of optical lattice clocks beyond the Dick limit

    Science.gov (United States)

    Takamoto, Masao; Takano, Tetsushi; Katori, Hidetoshi

    2011-05-01

    The supreme accuracy of atomic clocks relies on the universality of atomic transition frequencies. The stability of a clock, meanwhile, measures how quickly the clock's statistical uncertainties are reduced. The ultimate measure of stability is provided by the quantum projection noise, which improves as 1/√N by measuring N uncorrelated atoms. Quantum projection noise limited stabilities have been demonstrated in caesium clocks and in single-ion optical clocks, where the quantum noise overwhelms the Dick effect attributed to local oscillator noise. Here, we demonstrate a synchronous frequency comparison of two optical lattice clocks using 87Sr and 88Sr atoms, respectively, for which the Allan standard deviation reached 1 × 10-17 in an averaging time of 1,600 s by cancelling out the Dick effect to approach the quantum projection noise limit. The scheme demonstrates the advantage of using a large number (N ~ 1,000) of atoms in optical clocks and paves the way to investigating the inherent uncertainties of clocks and relativistic geodesy on a timescale of tens of minutes.

  6. Anisotropic Cosmological Model in Modified Brans--Dicke Theory

    CERN Document Server

    Rasouli, S M M; Sepangi, Hamid R

    2011-01-01

    It has been shown that four dimensional Brans-Dicke theory with effective matter field and self interacting potential can be achieved from vacuum 5D BD field equations, where we refer to as modified Brans-Dicke theory (MBDT). We investigate a generalized Bianchi type I anisotropic cosmology in 5D BD theory, and by employing obtained formalism, we derive induced-matter on any 4D hypersurface in context of the MBDT. We illustrate that if the usual spatial scale factors are functions of time while scale factor of extra dimension is constant, and scalar field depends on time and fifth coordinate, then in general, one will encounter inconsistencies in field equations. Then, we assume the scale factors and scalar field depend on time and extra coordinate as separated variables in power law forms. Hence, we find a few classes of solutions in 5D spacetime through which, we probe the one which leads to a generalized Kasner relations among Kasner parameters. The induced scalar potential is found to be in power law or i...

  7. Cosmological implications of a supersymmetric extension of the Brans-Dicke theory

    Energy Technology Data Exchange (ETDEWEB)

    Catena, R.

    2007-09-15

    In the Brans-Dicke theory the Planck mass is replaced by a dynamical scalar field. We consider here the supersymmetric analogous of this mechanism replacing in the supergravity Lagrangian the Planck mass with a chiral superfield. This analysis is motivated by the research of possible connections between supersymmetric Dark Matter scenarios and Dark Energy models based on Brans-Dicke-like theories. We find that, contrary to the original Brans-Dicke theory, in its supersymmetric analogous the gravitational sector does not couple to the matter sector in a universal metric way. As a result, violations of the weak equivalence principle could be present in such a scenario. (orig.)

  8. New Black Hole Solutions in Brans-Dicke Theory of Gravity

    CERN Document Server

    Kim, H

    1999-01-01

    Existence check of non-trivial, stationary axisymmetric black hole solutions in Brans-Dicke theory of gravity in different direction from those of Penrose, Thorne and Dykla, and Hawking is performed. Namely, working directly with the known explicit spacetime solutions in Brans-Dicke theory, it is found that non-trivial Kerr-Newman-type black hole solutions different from general relativistic solutions could occur for the generic Brans-Dicke parameter values -5/2\\leq ømega <-3/2. Finally, issues like whether these black holes can really arise in nature are discussed carefully.

  9. Generalized Sparling-Thirring form in the Brans-Dicke theory

    Energy Technology Data Exchange (ETDEWEB)

    Baykal, Ahmet [Nigde University, Department of Physics, Faculty of Arts and Sciences, Bor Yolu, Nigde (Turkey); Delice, Oezguer [Marmara University, Department of Physics, Faculty of Arts and Sciences, Istanbul (Turkey)

    2015-02-01

    The definition of the Sparling-Thirring form is extended to Brans-Dicke theory. By writing the Brans-Dicke field equations in a formally Maxwell-like form, a superpotential and a corresponding pseudo-energy-momentum form are defined. The general energy expression provided by the superpotential in the Jordan frame is discussed in relation to the corresponding expression in the Einstein frame. In order to substantiate its formal definition, the generalized Sparling-Thirring form is used to calculate the energy for the spherically symmetric vacuum solution in Brans-Dicke theory. (orig.)

  10. Dick Effect in a Microwave Frequency Standard Based on Laser-Cooled 113Cd+ Ions

    Science.gov (United States)

    Zhang, Jian-Wei; Miao, Kai; Wang, Li-Jun

    2015-01-01

    The Dick effect is one of the main limits to the frequency stability of a passive frequency standard, especially for the fountain clock and ion clock operated in pulsed mode which require unavoidable dead time during interrogation. Here we measure the phase noise of the interrogation oscillator applied in the microwave frequency standard based on laser-cooled 113Cd+ ions, and analyze the Allan deviation limited by the Dick effect. The results indicate that the Dick effect is one of the key issues for the cadmium ion clock to reach expected frequency stability. This problem can be resolved by interrogating the local oscillator continuously with two ion traps.

  11. Naked singularity formation in Brans-Dicke theory

    Energy Technology Data Exchange (ETDEWEB)

    Ziaie, Amir Hadi; Atazadeh, Khedmat [Department of Physics, Shahid Beheshti University, Evin, Tehran 19839 (Iran, Islamic Republic of); Tavakoli, Yaser, E-mail: am.ziaie@mail.sbu.ac.i, E-mail: k-atazadeh@sbu.ac.i, E-mail: tavakoli@ubi.p [Departamento de Fisica, Universidade da Beira Interior, Rua Marques d' Avila e Bolama, 6200 Covilha (Portugal)

    2010-04-07

    Gravitational collapse of the Brans-Dicke scalar field with non-zero potential in the presence of matter fluid obeying the barotropic equation of state, p = wrho, is studied. Utilizing the concept of the expansion parameter, it is seen that the cosmic censorship conjecture may be violated for w=-1/3 and w=-2/3 which correspond to the cosmic string and domain wall, respectively. We have shown that physically, it is the rate of collapse that governs the formation of a black hole or a naked singularity as the final fate of dynamical evolution and only for these two cases can the singularity be naked as the collapse end state. Also the weak energy condition is satisfied by the collapsing configuration.

  12. Cavity cooling beyond the Lamb-Dicke approximation

    CERN Document Server

    Blake, Tony; Beige, Almut

    2011-01-01

    Calculations based on the Lamb-Dicke approximation suggest that cavity cooling and ordinary laser cooling are essentially the same [see e.g. T. Blake et al., J. Mod. Opt., in press (2011)]. However, going beyond this approximation we obtain very different results. Here we show that cavity cooling can transfer particles to much lower temperatures than currently assumed, when the phonon frequency nu is comparable to or larger than the spontaneous cavity decay rate kappa. For nu << kappa, we predict much higher final phonon numbers than previous calculations. Moreover, we show that the optimal laser detuning is in both cases close to kappa. Our results should be more accurate than earlier predictions, since our calculations involve fewer approximations.

  13. Ultrastrong-coupling phenomena beyond the Dicke model

    Science.gov (United States)

    Jaako, Tuomas; Xiang, Ze-Liang; Garcia-Ripoll, Juan José; Rabl, Peter

    2016-09-01

    We study effective light-matter interactions in a circuit QED system consisting of a single L C resonator, which is coupled symmetrically to multiple superconducting qubits. Starting from a minimal circuit model, we demonstrate that, in addition to the usual collective qubit-photon coupling, the resulting Hamiltonian contains direct qubit-qubit interactions, which have a drastic effect on the ground- and excited-state properties of such circuits in the ultrastrong-coupling regime. In contrast to the superradiant phase transition expected from the standard Dicke model, we find an opposite mechanism, which at very strong interactions completely decouples the photon mode and projects the qubits into a highly entangled ground state. These findings resolve previous controversies over the existence of superradiant phases in circuit QED, but they more generally show that the physics of two- or multiatom cavity QED settings can differ significantly from what is commonly assumed.

  14. Generalized ghost dark energy in Brans-Dicke theory

    CERN Document Server

    Sheykhi, A; Yosefi, Y

    2013-01-01

    It was argued that the vacuum energy of the Veneziano ghost field of QCD, in a time-dependent background, can be written in the general form, $H + O(H^2)$, where $H$ is the Hubble parameter. Based on this, a phenomenological dark energy model whose energy density is of the form $\\rho=\\alpha H+\\beta H^{2}$ was recently proposed to explain the dark energy dominated universe. In this paper, we investigate this generalized ghost dark energy model in the setup of Brans-Dicke cosmology. We study the cosmological implications of this model. In particular, we obtain the equation of state and the deceleration parameters and a differential equation governing the evolution of this dark energy model. It is shown that the equation of state parameter of the new ghost dark energy can cross the phantom line ($w_D=-1$) provided the parameters of the model are chosen suitably.

  15. The momentum four-vector in Brans-Dicke wormholes

    CERN Document Server

    Pirinccioglu, N; Salti, M; Acikgoz, Irfan; Pirinccioglu, Nurettin; Salti, Mustafa

    2006-01-01

    In this work, in order to compute energy and momentum distributions (due to matter plus fields including gravitation) associated with the Brans-Dicke wormhole solutions we consider Moller's energy-momentum complexes both in general relativity and the teleparallel gravity, and the Einstein energy-momentum formulation in general relativity. We find exactly the same energy and momentum in three of the formulations. The results obtained in teleparallel gravity is also independent of the teleparallel dimensionless coupling parameter, which means that it is valid not only in the teleparallel equivalent of general relativity, but also in any teleparallel model. Furthermore, our results also sustains (a) the importance of the energy-momentum definitions in the evaluation of the energy distribution of a given spacetime and (b) the viewpoint of Lessner that the M{\\o}ller energy-momentum complex is a powerful concept of energy and momentum. (c) The results calculated supports the hypothesis by Cooperstock that the energ...

  16. Cosmological solutions of Brans-Dicke equations with cosmological constant

    Directory of Open Access Journals (Sweden)

    I. Ahmadi-Azar

    2002-12-01

    Full Text Available   In this paper, the analytical solutions of Brans-Dicke (B-D equations with cosmological constant are presented, in which the equation of state of the universe is P=mÙ° ρ , under the assumption φRn=c between the B-D field and the scale factor of the universe. The flat (K=0 Robertson- Walker metric has been considered for the metric of the universe. These solutions are rich in the sense that they include dust B-D theory with cosmological constant, Nariai Ù=° solutions, vacuum solutions of Ohanlen-Tupper and inflationary  Ù=° solutions.

  17. Dicke's Superradiance in Astrophysics. I -- The 21 cm Line

    CERN Document Server

    Rajabi, Fereshteh

    2016-01-01

    We have applied the concept of superradiance introduced by Dicke in 1954 to the ISM by extending the corresponding analysis to the magnetic dipole interaction characterizing the atomic hydrogen 21 cm line. Although it is unlikely that superradiance could take place in thermally relaxed regions, in situations where the conditions necessary for superradiance are met (i.e., close atomic spacing, high velocity coherence, population inversion, and long dephasing time-scales compared to those related to coherent behavior), our results suggest that relatively low levels of population inversion over short astronomical length-scales (e.g., as compared to those required for maser amplification) can lead to the cooperative behavior required for superradiance in the ISM. Given the results of our analysis, we expect the observational properties of superradiance to be characterized by the emission of high intensity, spatially compact, burst-like features potentially taking place over short periods ranging from minutes to d...

  18. Dicke's Superradiance in Astrophysics. II -- The OH 1612 MHz Line

    CERN Document Server

    Rajabi, Fereshteh

    2016-01-01

    We apply the concept of superradiance introduced by Dicke in 1954 to the OH molecule 1612 MHz spectral line often used for the detection of masers in circumstellar envelopes of evolved stars. As the detection of 1612 MHz OH masers in the outer shells of envelopes of these stars implies the existence of a population inversion and a high level of velocity coherence, and that these are two necessary requirements for superradiance, we investigate whether superradiance can also happen in these regions. Superradiance is characterized by high intensity, spatially compact, burst-like features taking place over time-scales on the order of seconds to years, depending on the size and physical conditions present in the regions harboring such sources of radiation. Our analysis suggests that superradiance provides a valid explanation for previous observations of intensity flares detected in that spectral line for the U Orionis Mira star and the IRAS18276-1431 pre-planetary nebula.

  19. Testing Brans-Dicke gravity using the Einstein telescope

    Science.gov (United States)

    Zhang, Xing; Yu, Jiming; Liu, Tan; Zhao, Wen; Wang, Anzhong

    2017-06-01

    Gravitational radiation is an excellent field for testing theories of gravity in strong gravitational fields. The current observations on the gravitational-wave (GW) bursts by LIGO have already placed various constraints on the alternative theories of gravity. In this paper, we investigate the possible bounds which could be placed on the Brans-Dicke gravity using GW detection from inspiraling compact binaries with the proposed Einstein Telescope, a third-generation GW detector. We first calculate in detail the waveforms of gravitational radiation in the lowest post-Newtonian approximation, including the tensor and scalar fields, which can be divided into the three polarization modes, i.e., "plus mode," "cross mode," and "breathing mode." Applying the stationary phase approximation, we obtain their Fourier transforms, and derive the correction terms in amplitude, phase, and polarization of GWs, relative to the corresponding results in general relativity. Imposing the noise level of the Einstein Telescope, we find that the GW detection from inspiraling compact binaries, composed of a neutron star and a black hole, can place stringent constraints on the Brans-Dicke gravity. The bound on the coupling constant ωBD depends on the mass, sky position, inclination angle, polarization angle, luminosity distance, redshift distribution, and total observed number NGW of the binary systems. Taking into account all the burst events up to redshift z =5 , we find that the bound could be ωBD≳1 06×(NGW/1 04)1/2. Even for the conservative estimation with 1 04 observed events, the bound is still more than one order tighter than the current limit from Solar System experiments. So, we conclude that the Einstein Telescope will provide a powerful platform to test alternative theories of gravity.

  20. Andrew Lees, a visionary mentored by a madman

    Directory of Open Access Journals (Sweden)

    Francisco Cardoso

    Full Text Available ABSTRACT Andrew Lees, Professor of Neurology at the National Hospital Queen Square (London, UK, has been recognized as the world’s most highly-cited researcher over the 200-year history of Parkinson’s Disease. Although he remains actively involved in the investigation of movement disorders, Prof. Lees embarked on a literary career that started in 2011 with the publication of a social history of his native Liverpool. His last work is Mentored by a Madman: The William Burroughs Experiment, which is reviewed here.

  1. Can Brans-Dicke Scalar Field Account for Dark Energy and Dark Matter?

    Science.gov (United States)

    Arik, M.; Çalik, M. C.

    By using a linearized non-vacuum late time solution in Brans-Dicke cosmology, we account for the 75% dark energy contribution but not for approximately 23% dark matter contribution to the present day energy density of the universe.

  2. Brans--Dicke cosmology does not have the $\\Lambda$CDM phase as an universal attractor

    CERN Document Server

    García-Salcedo, Ricardo; Quiros, Israel

    2015-01-01

    In this paper we seek for relevant information on the asymptotic cosmological dynamics of the Brans--Dicke theory of gravity for several self-interaction potentials. By means of the simplest tools of the dynamical systems theory, it is shown that the general relativity de Sitter solution is an attractor of the Jordan frame (dilatonic) Brans--Dicke theory only for the exponential potential $U(\\vphi)\\propto\\exp\\vphi$, which corresponds to the quadratic potential $V(\\phi)\\propto\\phi^2$ in terms of the original Brans--Dicke field $\\phi=\\exp\\vphi$, or for potentials which asymptote to $\\exp\\vphi$. At the stable de Sitter critical point, as well as at the stiff-matter equilibrium configurations, the dilaton is necessarily massless. We find bounds on the Brans--Dicke coupling constant $\\omega_\\textsc{bd}$, which are consistent with well-known results.

  3. Amplification of Gravitational Waves During Inflation in Brans-Dicke Theory

    CERN Document Server

    Berman, M S; Berman, Marcelo S.; Trevisan, Luis A.

    2001-01-01

    We show that Gravitational Waves are exponetially amplified in the inflationary phase in Brans-Dicke theory, so that it would be possible to detect them and in this way verify several features of physical reality.

  4. Making Dick and Jane: Historical Genesis of the Modern Basal Reader.

    Science.gov (United States)

    Luke, Allan

    1987-01-01

    This article traces the development of the Dick and Jane texts, examining the dominent intellectual and economic considerations of their authors and publishers in order to demystify their transmission of values, beliefs, and meanings. (MT)

  5. Evolution of the Brans-Dicke Parameter in Generalized Chameleon Cosmology

    Institute of Scientific and Technical Information of China (English)

    Mubasher Jami; D.Momeni

    2011-01-01

    @@ Motivated by an earlier study of Sahoo and Singh[Mod.Phys.Lett.A 17(2002)2409],we investigate the time dependence of the Brans-Dicke parameter ω(t)for an expanding Universe in the generalized Brans-Dicke Chameleon cosmology,and obtain an explicit dependence of ω(t)in different expansion phases of the Universe.Also,we discuss how the observed accelerated expansion of the observable Universe can be accommodated in the present formalism.%Motivated by an earlier study of Sahoo and Singh [Mod. Phys. Lett. A 17(2002)2409], we investigate the time dependence of the Brans-Dicke parameter ui(t) for an expanding Universe in the generalized Brans-Dicke Chameleon cosmology, and obtain an explicit dependence of uj(t) in different expansion phases of the Universe. Also, we discuss how the observed accelerated expansion of the observable Universe can be accommodated in the present formalism.

  6. Realization of the Dicke model using cavity-assisted Raman transitions

    CERN Document Server

    Baden, Markus P; Grimsmo, Arne L; Parkins, Scott; Barrett, Murray D

    2014-01-01

    We realize an open version of the Dicke model by coupling two hyperfine ground states using two cavity-assisted Raman transitions. The interaction due to only one of the couplings is described by the Tavis-Cummings model and we observe a normal mode splitting in the transmission around the dispersively shifted cavity. With both couplings present the dynamics are described by the Dicke model and we measure the onset of superradiant scattering into the cavity above a critical coupling strength.

  7. Realization of the Dicke model using cavity-assisted Raman transitions.

    Science.gov (United States)

    Baden, Markus P; Arnold, Kyle J; Grimsmo, Arne L; Parkins, Scott; Barrett, Murray D

    2014-07-11

    We realize an open version of the Dicke model by coupling two hyperfine ground states using two cavity-assisted Raman transitions. The interaction due to only one of the couplings is described by the Tavis-Cummings model and we observe a normal mode splitting in the transmission around the dispersively shifted cavity. With both couplings present the dynamics are described by the Dicke model and we measure the onset of superradiant scattering into the cavity above a critical coupling strength.

  8. Responses of the Brans-Dicke field due to gravitational collapses

    Energy Technology Data Exchange (ETDEWEB)

    Hwang, Dong-il; Yeom, Dong-han, E-mail: enotsae@gmail.co, E-mail: innocent@muon.kaist.ac.k [Department of Physics, KAIST, Daejeon 305-701 (Korea, Republic of)

    2010-10-21

    We study responses of the Brans-Dicke field due to gravitational collapses of scalar field pulses using numerical simulations. Double-null formalism is employed to implement the numerical simulations. If we supply a scalar field pulse, it will asymptotically form a black hole via dynamical interactions of the Brans-Dicke field. Hence, we can observe the responses of the Brans-Dicke field by two different regions. First, we observe the late time behaviors after the gravitational collapse, which include formations of a singularity and an apparent horizon. Second, we observe the fully dynamical behaviors during the gravitational collapse and view the energy-momentum tensor components. For the late time behaviors, if the Brans-Dicke coupling is greater (or smaller) than -1.5, the Brans-Dicke field decreases (or increases) during the gravitational collapse. Since the Brans-Dicke field should be relaxed to the asymptotic value with the elapse of time, the final apparent horizon becomes time-like (or space-like). For the dynamical behaviors, we observed the energy-momentum tensors around {omega} {approx} -1.5. If the Brans-Dicke coupling is greater than -1.5, the T{sub uu} component can be negative at the outside of the black hole. This can allow an instantaneous inflating region during the gravitational collapse. If the Brans-Dicke coupling is less than -1.5, the oscillation of the T{sub vv} component allows the apparent horizon to shrink. This allows a combination that violates weak cosmic censorship. Finally, we discuss the implications of the violation of the null energy condition and weak cosmic censorship.

  9. Experimental violation of the local realism for four-qubit Dicke state.

    Science.gov (United States)

    Zhao, Yuan-Yuan; Wu, Yu-Chun; Xiang, Guo-Yong; Li, Chuan-Feng; Guo, Guang-Can

    2015-11-16

    Dicke state is an widely used type of multi-particle entangled state in quantum information. However, very few works have been done on its nonlocality. Here we prepare a four-photon symmetric Dicke state, whose fidelity is as high as 0.904 ± 0.004, and devise a simple Bell-type inequality to demonstrate that it violates the local realism with 12 standard deviation.

  10. Through A Scanner Darkly: Neuropsychology and psychosis in Philip K. Dick's novel "A Scanner Darkly"

    OpenAIRE

    Bell, V.

    2006-01-01

    Partly motivated by his increasing brushes with psychosis, by the early 1970s the science fiction author Philip K. Dick was struggling with increasing doubts over the nature of reality and personal identity. Perhaps unsurprisingly, characters with unstable worlds and existential doubts are a familiar focus of his work. Dick was interested in more than just description however, and often used his novels to explore personal theories of existence. During his research, he discovered the work of R...

  11. 75 FR 41895 - Whirlpool Corporation, Evansville Division, Including On-Site Leased Workers From Andrews...

    Science.gov (United States)

    2010-07-19

    ... Workers From Andrews International, Inc., M.H. Equipment, and Kenco Logistics Services, LLC, Evansville..., Evansville Division, including on-site leased workers from Andrews International, Inc., Kenco Logistics... notice was published in the Federal Register on March 5, 2010 (75 FR 10321). The notice was amended...

  12. The Implementation of IAS 16 and IAS 41 at Andrew Peller Limited

    Science.gov (United States)

    Lapointe-Antunes, Pascale; Moore, James

    2013-01-01

    This case asks students to play the role of Doug Grodeckie, Manager of Financial Reporting at Andrew Peller Limited (APL). Doug was asked to prepare a report analyzing Andrew Peller Limited's current tangible long-lived assets disclosures and making recommendations on how best to comply with International Accounting Standard (IAS) 16 Property,…

  13. Dicke subradiance in a large cloud of cold atoms

    CERN Document Server

    Guerin, William; Kaiser, Robin

    2015-01-01

    More than 60 years ago, Dicke published a seminal paper on coherence in spontaneous radiation process by a collection of atoms. Superradiance has since attracted a lot of interest, from its first experimental observation in a fully inverted system in the 1970s to single photon superradiance in the 2000s. Subradiance, on the contrary, has remained elusive, mainly because subradiant states are weakly coupled to the environment and are very sensitive to non radiative decoherence processes. They are thus much harder to populate and to observe. Avoiding decoherence effects by using a dilute cloud of laser-cooled atoms containing a large number of atoms, we report on direct observation of subradiance. In our experiment, we use a far detuned laser to avoid multiple scattering and detect the temporal decay after a sudden switch-off of the laser beam. After the fast decay of most of the fluorescence, we observe a very slow decay, with time constants as long as 100 times the natural lifetime of the excited state of ind...

  14. [A legend of tropical veterinary medicine: Dick Zwart].

    Science.gov (United States)

    Dwinger, Ron; Uilenberg, Gerrit

    2014-01-01

    An overview is given of the achievements of Professor Dr. D. Zwart (1930-2005). Following a brief introduction dealing with his background, his first eleven years of working in tropical countries are reviewed. Initially he was employed as a government veterinarian in Dutch New Guinea, followed by five years as a scientist at the agricultural faculty in Kumasi, Ghana, where he completed his PhD on liver cirrhosis in local pigs. He was seconded by the Department of Tropical Veterinary Medicine at Utrecht University to work as a virologist in Vom, Nigeria. Once back in The Netherlands, he was selected to take over the position of head of the Department due to the unexpected death of Professor S. G. Wilson. He stayed for 20 years at Utrecht University and was for another nine years department head at the Agricultural University of Wageningen. He was an influential man during this long period as department head, not only for his students, but also in the international field. Four aspects of the achievements by Dick are highlighted in detail: as a scientist, as an educator, as a stimulating figure, and as a visionary.

  15. The Critical Point Entanglement and Chaos in the Dicke Model

    Directory of Open Access Journals (Sweden)

    Lina Bao

    2015-07-01

    Full Text Available Ground state properties and level statistics of the Dicke model for a finite number of atoms are investigated based on a progressive diagonalization scheme (PDS. Particle number statistics, the entanglement measure and the Shannon information entropy at the resonance point in cases with a finite number of atoms as functions of the coupling parameter are calculated. It is shown that the entanglement measure defined in terms of the normalized von Neumann entropy of the reduced density matrix of the atoms reaches its maximum value at the critical point of the quantum phase transition where the system is most chaotic. Noticeable change in the Shannon information entropy near or at the critical point of the quantum phase transition is also observed. In addition, the quantum phase transition may be observed not only in the ground state mean photon number and the ground state atomic inversion as shown previously, but also in fluctuations of these two quantities in the ground state, especially in the atomic inversion fluctuation.

  16. Dark Energy From Fifth Dimensional Brans-Dicke Theory

    CERN Document Server

    Bahrehbakhsh, Amir F; Vakili, Hajar

    2013-01-01

    Following the approach of the induced-matter theory, we investigate the cosmological implications of a five-dimensional Brans-Dicke theory, and propose to explain the acceleration of the universe. After inducing in a four-dimensional hypersurface, we classify the energy-momentum tensor into two parts in a way that, one part represents all kind of the matter (the baryonic and dark) and the other one contains every extra terms emerging from the scale factor of the fifth dimension and the scalar field, which we consider as the energy-momentum tensor of dark energy. We also separate the energy-momentum conservation equation into two conservation equations, one for matter and the other for dark energy. We perform this procedure for different cases, without interacting term and with two particular (suitable) interacting terms between the two parts. By assuming the parameter of the state equation for dark energy to be constant, the equations of the model admit the power-law solutions. Though, the non-interacting cas...

  17. Quantized Brans Dicke Theory: Phase Transition and Strong Coupling Limit

    CERN Document Server

    Pal, Sridip

    2016-01-01

    We show that Friedmann-Robertson-Walker (FRW) geometry with flat spatial section in quantized (Wheeler deWitt quantization) Brans Dicke (BD) theory reveals a rich phase structure owing to anomalous breaking of a classical symmetry, which maps the scale factor $a\\mapsto\\lambda a$ for some constant $\\lambda$. In the weak coupling ($\\omega$) limit, the theory goes from a symmetry preserving phase to a broken phase. The existence of phase boundary is an obstruction to another classical symmetry [arXiv:gr-qc/9902083] (which relates two BD theory with different coupling) admitted by BD theory with scale invariant matter content i.e $T^{\\mu}{}_{\\mu}=0$. Classically, this prohibits the BD theory to reduce to General Relativity (GR) for scale invariant matter content. We show that strong coupling limit of BD and GR both preserves the symmetry involving scale factor. We also show that with a scale invariant matter content (radiation i.e $P=\\frac{1}{3}\\rho$), the quantized BD theory does reduce to GR as $\\omega\\rightarr...

  18. New agegraphic dark energy in Brans-Dicke theory with logarithmic form of scalar field

    CERN Document Server

    Kumar, Pankaj

    2016-01-01

    In a very recent paper, the current authors (arXiv:gr-qc/1609.01477) have proposed and analyzed in detail the logarithmic form of Brans-Dicke scalar field $\\phi$ as $\\phi \\propto ln(\\alpha+\\beta a)$, where $\\alpha$ and $\\beta$ are positive constants, to alleviate the problems of interacting holographic dark energy models in Brans-Dicke theory. In this paper, the cosmological evolution of a new agegraphic dark energy (NADE) model within the framework of Friedmann-Robertson-Walker Universe is analyzed with the same form of scalar field in Brans-Dicke theory. We derive the equation of state parameter $w_D$ and deceleration parameter $q$ of NADE model. It is observed that $w_D\\rightarrow -1$ when $a\\rightarrow \\infty$, i.e., the NADE mimics cosmological constant in the late time evolution. Indeed, due to the assumption of logarithmic form of Brans-Dicke scalar field the NADE in Brans-Dicke theory behaves like NADE in general relativity in the late time evolution. The NADE model shows a phase transition from matte...

  19. Long-lived entangled qudits in a trapped three-level ion beyond the Lamb-Dicke limit

    Energy Technology Data Exchange (ETDEWEB)

    Dermez, Rasim [Department of Physics, Afyon Kocatepe University, Afyonkarahisar 03200 (Turkey); Muestecaplioglu, Oezguer E [Department of Physics, Koc University, Sariyer, Istanbul 34450 (Turkey)], E-mail: dermez@aku.edu.tr

    2009-01-15

    Higher dimensional quantum entanglement in a trapped three-level ion interacting with two laser beams in {lambda} scheme is investigated beyond the Lamb-Dicke limit. It is shown that higher dimensional entanglement can be established in a single step, with a tunable dimensionality and duration via the Lamb-Dicke parameter.

  20. 77 FR 35373 - Duke Energy Dicks Creek, LLC; Supplemental Notice That Initial Market-Based Rate Filing Includes...

    Science.gov (United States)

    2012-06-13

    ... From the Federal Register Online via the Government Publishing Office DEPARTMENT OF ENERGY Federal Energy Regulatory Commission Duke Energy Dicks Creek, LLC; Supplemental Notice That Initial Market-Based... above-referenced proceeding of Duke Energy Dicks Creek, LLC's application for market-based...

  1. Squeezing properties of a trapped ion in the running-wave laser beyond the Lamb-Dicke limit

    Institute of Scientific and Technical Information of China (English)

    Pan Chang-Ning; Fang Mao-Fa; Zheng Xiao-Juan; Hu Yao-Hua

    2007-01-01

    Beyond the Lamb-Dicke limit, this paper investigates the squeezing properties of the trapped ion in the travelling-wave laser. It shows that the squeezing properties of the trapped ion in the travelling-wave laser are strongly affected by the sideband number k, the Lamb- Dicke parameterηand the initial average phonon number.

  2. Third-order gas-liquid phase transition and the nature of Andrews critical point

    Directory of Open Access Journals (Sweden)

    Tian Ma

    2011-12-01

    Full Text Available The main objective of this article is to study the nature of the Andrews critical point in the gas-liquid transition in a physical-vapor transport (PVT system. A dynamical model, consistent with the van der Waals equation near the Andrews critical point, is derived. With this model, we deduce two physical parameters, which interact exactly at the Andrews critical point, and which dictate the dynamic transition behavior near the Andrews critical point. In particular, it is shown that 1 the gas-liquid co-existence curve can be extended beyond the Andrews critical point, and 2 the transition is first order before the critical point, second-order at the critical point, and third order beyond the Andrews critical point. This clearly explains why it is hard to observe the gas-liquid phase transition beyond the Andrews critical point. Furthermore, the analysis leads naturally the introduction of a general asymmetry principle of fluctuations and the preferred transition mechanism for a thermodynamic system. The theoretical results derived in this article are in agreement with the experimental results obtained in (K. Nishikawa and T. Morita, Fluid behavior at supercritical states studied by small-angle X-ray scattering, Journal of Supercritical Fluid, 13 (1998, pp. 143-148. Also, the derived second-order transition at the critical point is consistent with the result obtained in (M. Fisher, Specific heat of a gas near the critical point, Physical Review, 136:6A (1964, pp. A1599-A1604.

  3. Holographic dark energy in Brans-Dicke cosmology with chameleon scalar field

    Energy Technology Data Exchange (ETDEWEB)

    Setare, M.R., E-mail: rezakord@ipm.i [Department of Science of Bijar, University of Kurdistan, Bijar (Iran, Islamic Republic of); Jamil, Mubasher, E-mail: mjamil@camp.edu.p [Center for Advanced Mathematics and Physics, National University of Sciences and Technology, Rawalpindi 46000 (Pakistan)

    2010-06-07

    We study a cosmological implication of holographic dark energy in the Brans-Dicke gravity. We employ the holographic model of dark energy to obtain the equation of state for the holographic energy density in non-flat (closed) universe enclosed by the event horizon measured from the sphere of horizon named L. Our analysis shows that one can obtain the phantom crossing scenario if the model parameter {alpha} (of order unity) is tuned accordingly. Moreover, this behavior is achieved by treating the Brans-Dicke scalar field as a Chameleon scalar field and taking a non-minimal coupling of the scalar field with matter. Hence one can generate phantom-like equation of state from a holographic dark energy model in non-flat universe in the Brans-Dicke cosmology framework.

  4. Phase-plane analysis of Friedmann-Robertson-Walker cosmologies in Brans-Dicke gravity

    CERN Document Server

    Holden, D J; Holden, Damien J.; Wands, David

    1998-01-01

    We present an autonomous phase-plane describing the evolution of Friedmann-Robertson-Walker models containing a perfect fluid (with barotropic index gamma) in Brans-Dicke gravity (with Brans-Dicke parameter omega). We find self-similar fixed points corresponding to Nariai's power-law solutions for spatially flat models and curvature-scaling solutions for curved models. At infinite values of the phase-plane variables we recover O'Hanlon and Tupper's vacuum solutions for spatially flat models and the Milne universe for negative spatial curvature. We find conditions for the existence and stability of these critical points and describe the qualitative evolution in all regions of the (omega,gamma) parameter space for 0-3/2. We show that the condition for inflation in Brans-Dicke gravity is always stronger than the general relativistic condition, gamma<2/3.

  5. Late time cosmic acceleration from vacuum Brans-Dicke theory in 5D

    CERN Document Server

    de Leon, J Ponce

    2009-01-01

    We show that the scalar-vacuum Brans-Dicke equations in 5D are equivalent to Brans-Dicke theory in 4D with a self interacting potential and an effective matter field. The cosmological implication, in the context of FRW models, is that the observed accelerated expansion of the universe comes naturally from the condition that the scalar field is not a ghost, i.e., $\\omega > - 3/2$. We find an effective matter-dominated 4D universe which shows accelerated expansion if $- 3/2 < \\omega < - 1$. We study the question of whether accelerated expansion can be made compatible with large values of $\\omega$, within the framework of a 5D scalar-vacuum Brans-Dicke theory with variable, instead of constant, parameter $\\omega$. In this framework, and based on a general class of solutions of the field equations, we demonstrate that accelerated expansion is incompatible with large values of $\\omega$.

  6. Nonlinearly charged dilatonic black holes and their Brans-Dicke counterpart: energy dependent spacetime

    Science.gov (United States)

    Hendi, S. H.; Talezadeh, M. S.

    2017-01-01

    Regarding the wide applications of dilaton gravity in the presence of electrodynamics, we introduce a suitable Lagrangian for the coupling of dilaton with gauge field. There are various Lagrangians which show the coupling between scalar fields and electrodynamics with correct special situations. In this paper, taking into account conformal transformation of Brans-Dicke theory with an electrodynamics Lagrangian, we show that how scalar field should couple with electrodynamics in dilaton gravity. In other words, in order to introduce a correct Lagrangian of dilaton gravity, one should check at least two requirements: compatibility with Brans-Dicke theory and appropriate special situations. Finally, we apply the mentioned method to obtain analytical solutions of dilaton-Born-Infeld and Brans-Dicke-Born-Infeld theories with energy dependent spacetime.

  7. Relationship between Humans and Nature in Melville’s Moby Dick

    Institute of Scientific and Technical Information of China (English)

    余奕汶

    2015-01-01

    Herman Melville,with Moby Dick as his masterpiece,is a famous romantic writer.Moby Dick is a "bright pearl" in the literary treasury of the world.By allegorically depicting the cruel killing of whales by the Captain Ahab and other sailors in his whaling ship,and their tragically being drowned in the sea,the writer reveals that if humans are too selfcentered,we will inevitably be punished by nature.Start with the three states that humans get along with nature in Moby Dick,my thesis aims at exploring the transformations of the relationship between humans and nature as well as the edification that humans may gain from the tragic story.

  8. Nonlinearly charged dilatonic black holes and their Brans-Dicke counterpart: Energy dependent spacetime

    CERN Document Server

    Hendi, S H

    2016-01-01

    Regarding the wide applications of dilaton gravity in the presence of electrodynamics, we introduce a suitable Lagrangian for the coupling of dilaton with gauge field. There are various Lagrangians which show the coupling between scalar fields and electrodynamics with correct special situations. In this paper, taking into account conformal transformation of Brans-Dick theory with an electrodynamics Lagrangian, we show that how the scalar field should couple with electrodynamics in dilaton gravity. In other words, in order to introduce a correct Lagrangian of dilaton gravity, one should check at least two requirements: compatibility with Brans-Dick theory and appropriate special situations. Finally, we apply the mentioned method to obtain analytical solutions of dilaton-Born-Infeld and Brans-Dicke-Born-Infeld theories with energy dependent spacetime.

  9. Magnetic point sources in three dimensional Brans-Dicke gravity theories

    CERN Document Server

    Dias, O J C; Dias, Oscar J. C.; Lemos, Jose' P. S.

    2002-01-01

    We obtain geodesically complete spacetimes generated by static and rotating magnetic point sources in an Einstein-Maxwell-Dilaton theory of the Brans-Dicke type in three dimensions (3D). The theory is specified by three fields, the dilaton, the graviton and the electromagnetic field, and two parameters, the cosmological constant and the Brans-Dicke parameter, w. When the Brans-Dicke parameter is infinity, our solution reduces to the magnetic counterpart of the BTZ solution, while the w=0 case is equivalent to 4D general relativity with one Killing vector. The source for the magnetic field can be interpreted as composed by a system of two symmetric and superposed electric charges. One of the electric charges is at rest and the other is spinning.

  10. A transnational conference romance: Elsie Andrews, Hildegarde Kneeland, and the Pan-Pacific Women's Association.

    Science.gov (United States)

    Laurie, Alison J

    2009-01-01

    Elsie Andrews, a feminist activist from New Zealand, met Dr. Hildegarde Kneeland, a progressive economist from the United States, at the 1934 Pan-Pacific Women's Association conference in Honolulu. Andrews wrote diaries of her attendance at conferences, and in these writes openly of her attraction and romantic feelings for Kneeland, despite her own long-term domestic partnership back in New Plymouth with Muriel Kirton. This article considers the role conference romances may have played for Andrews and others in encouraging their interest in women's organizations, in the context of literature on romantic friendships and lesbianism.

  11. Proposed realization of the Dicke-model quantum phase transition in an optical cavity QED system

    CERN Document Server

    Dimer, F; Estienne, B; Parkins, A S

    2006-01-01

    The Dicke model consisting of an ensemble of two-state atoms interacting with a single quantized mode of the electromagnetic field exhibits a zero-temperature phase transition at a critical value of the dipole coupling strength. We propose a scheme based on multilevel atoms and cavity-mediated Raman transitions to realise an effective Dicke system operating in the phase transition regime. Output light from the cavity carries signatures of the critical behavior which is analyzed for the thermodynamic limit where the number of atoms is very large.

  12. Thermodynamics of charged rotating solutions in Brans-Dicke gravity with Born-Infeld field

    Science.gov (United States)

    Pakravan, J.; Takook, M. V.

    2017-09-01

    We derive new exact charged rotating solutions of (n+1)-dimensional Brans-Dicke theory in the presence of Born-Infeld field and investigated their properties. Because of the coupling between scalar field and curvature, the field equations cannot to be solved directly. Using a new conformal transformation, which transforms the Einstein-dilaton-Born-Infeld gravity Lagrangian to the Brans-Dicke-Born-Infeld gravity one, the field equations are solved. We also compute temperature, charge, mass, electric potential, and entropy; entropy, however, does not obey the area law. These quantities are invariant under conformal transformation and satisfy the first law of thermodynamics.

  13. Dicke Coherent Narrowing in Two-Photon and Raman Spectroscopy of Thin Vapour Cells

    CERN Document Server

    Dutier, G; Hamdi, I; Maurin, I; Saltiel, S; Bloch, D; Ducloy, M; Dutier, Gabriel; Todorov, Petko; Hamdi, Ismah\\`{e}ne; Maurin, Isabelle; Saltiel, Solomon; Bloch, Daniel; Ducloy, Martial

    2005-01-01

    The principle of coherent Dicke narrowing in a thin vapour cell, in which sub-Doppler spectral lineshapes are observed under a normal irradiation for a l/2 thickness, is generalized to two-photon spectroscopy. Only the sum of the two wave vectors must be normal to the cell, making the two-photon scheme highly versatile. A comparison is provided between the Dicke narrowing with copropagating fields, and the residual Doppler-broadening occurring with counterpropagating geometries. The experimental feasibility is discussed on the basis of a first observation of a two-photon resonance in a 300 nm-thick Cs cell. Extension to the Raman situation is finally considered.

  14. Wie was Andrew Murray (1828-1917 in werklikheid?

    Directory of Open Access Journals (Sweden)

    T.G. Mahne

    1999-08-01

    Full Text Available Murray (1828-1917 was an emissary of God. In the Dutch Reformed Church in South Africa, where he served as a full time minister for fifty eight years, he was elected Moderator six times. His influence, however, was not limited to the Dutch Reformed Church. Of the two hundred and fifty books (more than 20 000 pages he wrote, some were translated into more than twenty languages. In spite of his intention not to write theological works, Murray was granted a doctorate degree in Theology by the University of Aberdeen in 1898. He was a man of prayer who published approximately thirty books about prayer. Murray, a mystic and peifectionist, was reared in an extremely legalistic home. As a student he joined the Secor Dabar association which was an offspring of the legalistic Reveil movement in the first half of the nineteenth century. At the age of roundabout 65, Murray was impressed by the writings of William Law (1686-1761, which fitted his mindset like a glove. But who was Andrew Murray actually? Other similar questions concerning his influence in the Dutch Reformed Church are equally important. First and foremost however: Who was this man? Was he possibly a "tossed salad" theologian? Still today we find traces of Murrayism in the Dutch Reformed Church. Fortunately his full-time service of fifty eight years has left behind a positive heritage of Scottish Calvinism.

  15. Mida mõtleb professor Andrew Mayo? / Anne-Mari Ernesaks

    Index Scriptorium Estoniae

    Ernesaks, Anne-Mari

    2005-01-01

    PARE koordinaator tutvustab tuntud inimkapitali ideoloogi Andrew Mayo raamatut "Ettevõtte inimväärtus". Raamatu autori hinnangul on tänapäeva organisatsioonides juhtimise olulisim ülesanne inimese juhtimine varana. Lisa: Konverents

  16. Mida mõtleb professor Andrew Mayo? / Anne-Mari Ernesaks

    Index Scriptorium Estoniae

    Ernesaks, Anne-Mari

    2005-01-01

    PARE koordinaator tutvustab tuntud inimkapitali ideoloogi Andrew Mayo raamatut "Ettevõtte inimväärtus". Raamatu autori hinnangul on tänapäeva organisatsioonides juhtimise olulisim ülesanne inimese juhtimine varana. Lisa: Konverents

  17. Environmental Assessment of the Privatization of Military Family Housing at Andrews Air Force Base, Maryland

    Science.gov (United States)

    2007-05-01

    multicomponent sites on Andrews AFB; both are potentially NRHP- eligible. 1999 Bienenfeld and Leininger Phase II Survey and Testing Tested nine sites: six...and Leininger 1999 Note: a The prehistoric component of Site 18PR447 is not eligible for the NRHP. Architectural Resources. As noted in the ICRMP...the United States. March 1995. Andrews AFB, MD May 2007 7-1 EA of the Privatization of MFH Bienenfeld and Leininger 1999 Bienenfeld, Paula

  18. Classical and quantum solutions in Brans-Dicke cosmology with a perfect fluid

    Science.gov (United States)

    Paliathanasis, Andronikos; Tsamparlis, Michael; Basilakos, Spyros; Barrow, John D.

    2016-02-01

    We consider the application of group invariant transformations in order to constrain a flat isotropic and homogeneous cosmological model, containing a Brans-Dicke scalar field and a perfect fluid with a constant equation of state parameter w , where the latter is not interacting with the scalar field in the gravitational action integral. The requirement that the Wheeler-DeWitt equation be invariant under one-parameter point transformations provides us with two families of power-law potentials for the Brans-Dicke field, in which the powers are functions of the Brans-Dicke parameter ωBD and the parameter w . The existence of the Lie symmetry in the Wheeler-DeWitt equation is equivalent to the existence of a conserved quantity in field equations and with oscillatory terms in the wave function of the Universe. This enables us to solve the field equations. For a specific value of the conserved quantity, we find a closed-form solution for the Hubble factor, which is equivalent to a cosmological model in general relativity containing two perfect fluids. This provides us with different models for specific values of the parameters ωBD , and w . Finally, the results hold for the specific case where the Brans-Dicke parameter ωBD is zero, that is, for the O'Hanlon massive dilaton theory and, consequently, for f (R ) gravity in the metric formalism.

  19. Can Brans-Dicke scalar field account for dark energy and dark matter?

    CERN Document Server

    Calik, M A M C

    2005-01-01

    By using a linearized non-vacuum late time solution in Brans-Dicke cosmology we account for the seventy five percent dark energy contribution but not for approximately twenty-three percent dark matter contribution to the present day energy density of the universe.

  20. Can a Hyperbolic Phase of the Brans-Dicke Field Account for Dark Matter?

    Science.gov (United States)

    Arik, M.; Çalik, M.; Çifter, F.

    We show that the introduction of a hyperbolic phase of the Brans-Dicke (BD) field results in a flat vacuum cosmological solution of the Hubble parameter H and a fractional rate of change of the BD scalar field F, which asymptotically approach constant values. At later stages, the hyperbolic phase of the BD field behaves like dark matter.

  1. Can hyperbolic phase of Brans-Dicke field account for Dark Matter?

    CERN Document Server

    Arik, M; Cifter, F

    2008-01-01

    We show that the introduction of a hyperbolic phase for Brans-Dicke (BD) field results in a flat vacuum cosmological solution of Hubble parameter H and fractional rate of change of BD scalar field, F which asymptotically approach constant values. At late stages, hyperbolic phase of BD field behaves like dark matter.

  2. Combined Brans-Dicke-Einstein-Cartan Inflationary Solution with Lambda-Term

    CERN Document Server

    Berman, M S

    2006-01-01

    A combined BCDE (Brans-Dicke and Einstein-Cartan) theory is developed through Raychaudhuri's equation, for inflationary scenario. It involves a variable cosmological constant, which decreases with time, jointly with energy density, cosmic pressure, shear and Hubble's parameter, while the scale factor, scalar field and spin increase exponentially. Except for the spin component, the fluid goes in the limit, into a perfect fluid.

  3. Pursuing "Moby-Dick" in the Classroom, the Museum, Back in the Classroom, and Beyond.

    Science.gov (United States)

    Wallace, Robert K.; Zlatkin, Aaron; Hixson, Lindsay; Kallmeyer, Robert J.; Sekowski, Kristen; Brock, Gina R.; Gallagher, Michael; Fletcher, William Ryan

    1997-01-01

    Describes a university course that explored the novel "Moby Dick" by Herman Melville and its relation to art highlighting the two student initiatives. Provides the opening statements from each of the 12 students at the National Association for Humanities Education Convention from their presentation on the course where they each related their…

  4. Gravity in a stabilized brane world model in five-dimensional Brans-Dicke theory

    CERN Document Server

    Mikhailov, A S; Smolyakov, M N; Volobuev, I P

    2008-01-01

    Linearized equations of motion for gravitational and scalar fields are found and solved in a stabilized brane world model in five-dimensional Brans-Dicke theory. The physical degrees of freedom are isolated, the mass spectrum of Kaluza-Klein excitations is found and the coupling constants of these excitations to matter on the negative tension brane are calculated.

  5. Teaching Psychology and Literature: Melancholia as Motivation in the Novels of Dick Francis

    Science.gov (United States)

    Wagner, Elaine

    2010-01-01

    Teaching literature from a psychological perspective provides a basis for the study and analysis of human motivation and behavior, as psychology and literature make mutual contributions to the study of both disciplines. Melancholia is a recurring theme in the novels of Dick Francis, and the first-person accounts of despair and depression are…

  6. Frame transformations in Brans-Dicke theory from the viewpoint of Weyl geometry

    CERN Document Server

    Lobo, Iarley P

    2016-01-01

    Brans-Dicke theory is described by an action that allows the so called frame transformation, which removes the non-minimal coupling between the scalar field and the curvature by a coupling between the metric tensor and matter fields. In this paper, we describe how the viewpoint that they are physically equivalent has a geometrical counterpart in the framework of Weyl integrable geometry.

  7. Christa McAuliffe and Dick Scobee in Shuttle mission simulator

    Science.gov (United States)

    1985-01-01

    Astronaut Francis R. (Dick) Scobee, STS 51-L commander, briefs Payload specialist Sharon Christa McAuliffe about some of the flight systems of the Space Shuttle during a training session in JSC's Shuttle mission simulator. They are on the flight deck with McAuliffe seated at the pilot's station and Scobee at the commander's station.

  8. Quantum Logic Operation with Single Trapped Ion Without Limitation of Lamb-Dicke Parameter

    Institute of Scientific and Technical Information of China (English)

    ZHANG Rong; ZHU Shi-Qun

    2003-01-01

    By applying the nonlinear interaction between internal and external degrees of a trapped ion with theassistance of two pairs or three pairs of laser beams that are perpendicular to each other, the realization of quantumlogic operation without the limitation on the Lamb-Dicke parameter can be achieved when the lasers are tuned to thecarrier.

  9. Using the Andrews Plotss to Visualize Multidimensional Data in Multi-criteria Optimization

    Directory of Open Access Journals (Sweden)

    S. V. Groshev

    2015-01-01

    Full Text Available Currently, issues on processing of large data volumes are of great importance. Initially, the Andrews plots have been proposed to show multidimensional statistics on the plane. But as the Andrews plots retain information on the average values of the represented values, distances, and dispersion, the distances between the plots linearly indicate distances between the data points, and it becomes possible to use the plots under consideration for the graphical representation of multi-dimensional data of various kinds. The paper analyses a diversity of various mathematical apparatus for Andrews plotting to visualize multi-dimensional data.The first section provides basic information about the Andrews plots, as well as about a test set of multidimensional data in Iris Fischer’s literature. Analysis of the Andrews plot properties shows that they provide a limitlessly many one-dimensional projections on the vectors and, furthermore, the plots, which are nearer to each other, correspond to nearly points. All this makes it possible to use the plots under consideration for multi-dimensional data representation. The paper considers the Andrews plot formation based on Fourier transform functions, and from the analysis results of plotting based on a set of the test, it draws a conclusion that in this way it is possible to provide clustering of multidimensional data.The second section of the work deals with research of different ways to modify the Andrews plots in order to improve the perception of the graphical representation of multidimensional data. Different variants of the Andrews plot projections on the coordinate planes and arbitrary subspaces are considered. In addition, the paper studies an effect of the Andrews plot scaling on the visual perception of multidimensional data.The paper’s third section describes Andrews plotting based on different polynomials, in particular, Chebyshev and Legendre polynomials. It is shown that the resulting image is

  10. The life of Andrew Boorde, c1490-1549.

    Science.gov (United States)

    Fletcher, Patricia E S

    2002-01-01

    Physician, traveller, writer and spy, Andrew Boorde was born c1490 and became a Carthusian monk after abandoning his medical studies at Oxford. Temperamentally unsuited to the life of a religious, after 20 years at the London Charterhouse he obtained a dispensation to travel to Europe to continue his medical studies. Returning to England he began to practise medicine, treating members of the nobility and, through a meeting with Thomas Cromwell which was to influence the rest of his life, he attended the King, Henry VIII. In 1534, after a second, more extensive, tour of Europe in which he visited many medical schools and universities seeking yet more medical knowledge, he returned to the London Charterhouse which was undergoing a brutal dissolution at the hands of Thomas Cromwell. Boorde reluctantly signed the Oath of Supremacy, an act which was to haunt him for the rest of his life. He was then used by Cromwell to travel abroad again but this time as a spy to gather intelligence for the King while continuing to study medicine. Boorde finally took his MD at the University of Montpellier and was incorporated in the same degree a year later at Oxford. He then gave expression to all he had learnt by writing his legacy, four books which were published in 1547. 'A Compendyous Regyment or a Dyetary of Health' was one of the earliest treatises on the cultivation of health composed in England and stressed the importance of sanitation together with a detailed examination of diet. The 'Brevyary of Health' listed diseases alphabetically together with remedies and treatment, blending sound medical advice with religion and superstition: its companion volume was 'The Principles of Astronomy'. But Boorde's 'Fyrst Boke of the Introduction of Knowledge' was his tour-de-force; it was a comprehensive encyclopaedia of all the European countries he had visited, illustrated by woodcuts. By 1547 Boorde was settled in England, probably Master of the Hospital of St Giles-in-the-Fields in

  11. The Dicke model phase transition in the quantum motion of a Bose-Einstein condensate in an optical cavity

    CERN Document Server

    Nagy, D; Szirmai, G; Domokos, P

    2009-01-01

    We show that the motion of a laser-driven Bose-Einstein condensate in a high-finesse optical cavity realizes the spin-boson Dicke-model. The quantum phase transition of the Dicke-model from the normal to the superradiant phase corresponds to the self-organization of atoms from the homogeneous into a periodically patterned distribution above a critical driving strength. The fragility of the ground state due to photon measurement induced back action is calculated.

  12. Phase transition of charged Black Holes in Brans-Dicke theory through geometrical thermodynamics

    CERN Document Server

    Hendi, S H; Panah, B Eslam; Armanfard, Z

    2015-01-01

    In this paper, we take into account black hole solutions of Brans-Dicke-Maxwell theory and investigate their stability and phase transition points. We apply the concept of geometry in thermodynamics to obtain phase transition points and compare its results with those of calculated in canonical ensemble through heat capacity. We show that these black holes enjoy second order phase transitions. We also show that there is a lower bound for the horizon radius of physical charged black holes in Brans-Dicke theory which is originated from restrictions of positivity of temperature. In addition, we find that employing specific thermodynamical metric in the context of geometrical thermodynamics yields divergencies for thermodynamical Ricci scalar in places of phase transitions. It will be pointed out that due to characteristics behavior of thermodynamical Ricci scalar around its divergence points, one is able to distinguish the physical limitation point from the phase transitions.

  13. An stellar explosion in the weak field approximation of the Brans-Dicke theory

    CERN Document Server

    Hamity, V H; Hamity, Victor H.; Barraco, Daniel E.

    2005-01-01

    We treat a very crude model of an exploding star, in the weak field approximation of the Brans-Dicke theory, that shows aspects that resembles some characteristics data of a Type Ia Supernova. The most noticeable result in the electromagnetic component, is the relationship between the absolute magnitude at maximum brightness of the star and the decline rate in one magnitude from that maximum. This characteristic has become one of the most accurate method to measure luminosity distances to objects at cosmological distances. Another interesting result is that the active mass associated with the scalar field is totally radiated to infinity, representing a mass loss in the ratio of the "tensor" component to the scalar component of 1 to $(2\\omega + 3)$ ($\\omega$ is the Brans-Dicke parameter), in agreement with a general result of Hawking. Then, this model shows explicitly, in a dynamical case, the mechanism of radiation of scalar field, which is necessary to understand the Hawking result.

  14. Exact solutions of Brans-Dicke cosmology with decaying vacuum density

    CERN Document Server

    Montenegro, A E

    2007-01-01

    We investigate cosmological solutions of Brans-Dicke theory with both the vacuum energy density and the gravitational constant decaying linearly with the Hubble parameter. A particular class of them, with constant deceleration factor, sheds light on the cosmological constant problems, leading to a presently small vacuum term, and to a constant ratio between the vacuum and matter energy densities. By fixing the only free parameter of these solutions, we obtain cosmological parameters in accordance with observations of both the relative matter density and the universe age. In addition, we have three other solutions, with Brans-Dicke parameter w = -1 and negative cosmological term, two of them with a future singularity of big-rip type. Although interesting from the theoretical point of view, two of them are not in agreement with the observed universe. The third one leads, in the limit of large times, to a constant relative matter density, being also a possible solution to the cosmic coincidence problem.

  15. "Brans-Dicke" with $\\Lambda>0$: Black holes and large scale structures

    CERN Document Server

    Bhattacharya, Sourav; Romano, Antonio E; Tomaras, Theodore N

    2015-01-01

    The no-hair theorem is generalized to stationary axisymmetric black-holes in scalar tensor theories of the Brans-Dicke type with positive cosmological constant, general $\\omega(\\phi)$ and potential $V(\\phi)$. For finite constant $\\omega$ the Brans-Dicke field $\\phi$ is shown to blow-up logarithmically at the horizons. Perturbative solutions of the theory are analyzed relevant to astrophysical applications, where either one or both horizons are "hidden". It is shown that when the stationary cosmological horizon is hidden, the black hole horizon supports non-trivial "$\\phi-$hair". On the other hand, when the black hole horizon is hidden, the presence of the cosmological one leads to an upper bound on $\\omega$.

  16. Dick Pastor:A Life Devoted to US-China Friendship

    Institute of Scientific and Technical Information of China (English)

    2008-01-01

    <正>Three old men happily got together again Chatting about what happened last sixty years There are still great expectations before them Don’t forget to meet again in Beijing in 2008! The above lines were written on a scroll by then 90-year-old famous Chinese writer and calligrapher Ma Shitu for Dick Pastor,an American ex-soldier fighting with China against Japanese aggression during the Second World War,who came to have a grand reunion with Ma and myself in Kunming in the fall of 2004.In the early hours of January 20 of 2008,while the Beijing Olympics are approaching,Dick Pastor passed away peacefully,but with a great regret,in New York at the age of almost 90.

  17. Static and rotating electrically charged black holes in three-dimensional Brans-Dicke gravity theories

    CERN Document Server

    Dias, O J C; Dias, Oscar J. C.; Lemos, Jose' P. S.

    2001-01-01

    We obtain static and rotating electrically charged black holes of a Einstein-Maxwell-Dilaton theory of the Brans-Dicke type in (2+1)-dimensions. The theory is specified by three fields, the dilaton, the graviton and the electromagnetic field, and two parameters, the cosmological constant and the Brans-Dicke parameter. It contains eight different cases, of which one distinguishes as special cases, string theory, general relativity and a theory equivalent to four dimensional general relativity with one Killing vector. We find the ADM mass, angular momentum, electric charge and dilaton charge and compute the Hawking temperature of the solutions. Causal structure and geodesic motion of null and timelike particles in the black hole geometries are studied in detail.

  18. Observation of Dicke superradiance for two artificial atoms in a cavity with high decay rate.

    Science.gov (United States)

    Mlynek, J A; Abdumalikov, A A; Eichler, C; Wallraff, A

    2014-11-04

    An individual excited two-level system decays to its ground state in a process known as spontaneous emission. The probability of detecting the emitted photon decreases exponentially with the time passed since its excitation. In 1954, Dicke first considered the more subtle situation in which two emitters decay in close proximity to each other. He argued that the emission dynamics of a single two-level system is altered by the presence of a second one, even if it is in its ground state. Here, we present a close to ideal realization of Dicke's original two-spin Gedankenexperiment, using a system of two individually controllable superconducting qubits weakly coupled to a fast decaying microwave cavity. The two-emitter case of superradiance is explicitly demonstrated both in time-resolved measurements of the emitted power and by fully reconstructing the density matrix of the emitted field in the photon number basis.

  19. Spherically symmetric Jordan-Brans-Dicke quantum gravity with de Broglie Bohm pilot wave perspective

    CERN Document Server

    Ghaffarnejad, Hossein

    2013-01-01

    We obtain two dimensional analogue of the Jordan-Brans-Dicke (JBD) gravity action described in four dimensional spherically symmetric curved space time metric. There will be two scalar fields, namely, the Brans Dicke (BD) $\\phi$ and scale factor of 2-sphere part of the space time $\\psi.$ There is obtained a suitable duality transformation between $(\\psi,\\phi)$ and $(\\rho,S)$ where $\\rho$ and $S$ are respectively amplitude and phase part of the corresponding de Broglie pilot wave function $\\Psi(\\rho,S)=\\sqrt{\\rho}e^{iS}.$ There is established covariant conservation of mass-energy current density of particles ensemble $J_a=\\rho\\partial_aS,$ in a particular dynamical conformal frame described by $(\\rho,S).$

  20. Uniqueness of the Machian Solution in the Brans-Dicke Theory

    CERN Document Server

    Miyazaki, A

    2001-01-01

    Machian solutions of which the scalar field exhibits the asymptotic behavior $\\phi =O(\\rho /\\omega)$ are generally explored for the homogeneous and isotropic universe in the Brans-Dicke theory. It is shown that the Machian solution is unique for the closed and the open space. Such a solution is restricted to one that satisfies the relation $GM/c^{2}a=const$, which is fixed to $\\pi $ in the theory for the closed model. Another type of solution satisfying $\\phi =O(\\rho /\\omega)$ with the arbitrary coupling constant $% \\omega $ is obtained for the flat space. This solution has the scalar field $% \\phi \\propto \\rho t^{2}$ and also keeps the relation $GM/c^{2}R=const$ all the time. This Machian relation and the asymptotic behavior $\\phi =O(\\rho /\\omega)$ is equivalent to each other in the Brans-Dicke theory.

  1. Analysis of the"Sea"in Robinson Crusoe and Moby Dick

    Institute of Scientific and Technical Information of China (English)

    魏丽萍

    2016-01-01

    This paper employs a comparative analysis to study Daniel Defoe's Robinson Crusoe and Herman Melville's Moby Dick. The author compares them from both quantitative and qualitative aspects. As for the quantitative aspect, a corpus-based study was carried out to research on the word"sea". As for the qualitative study, the author mainly focuses on the implications of the seas, the images of two protagonists based on the interaction between man and the sea.

  2. Brans-Dicke-type theories and avoidance of the cosmological singularity

    CERN Document Server

    Quirós, I; Cardenas, R; Quiros, Israel; Bonal, Rolando; Cardenas, Rolando

    2000-01-01

    A point of view, based on a postulate about the physical equivalence of conformal representations of a given physical situation in Brans-Dicke-type theories of gravitation is presented, that automatically solves the discussion about the physical equivalence of Jordan frame and Einstein frame formulations of scalar-tensor theory. The cosmological consequences of this viewpoint for general relativity are studied, and its implications for the low-energy limit of string theory outlined.

  3. Five dimensional minimally interacting holographic dark energy model in Brans-Dicke theory of gravitation

    Science.gov (United States)

    Reddy, D. R. K.; Anitha, S.; Umadevi, S.

    2016-11-01

    In this paper, we investigate five dimensional space-time filled with minimally interacting dark matter and holographic dark energy in Brans-Dicke (Phys. Rev. 124:925, 1961) scalar-tensor theory of gravitation. The exact solutions of the field equations are obtained using (i) special law of variation for Hubble's parameter that yields constant value of deceleration parameter and (ii) a relation between metric potentials. The physical and geometrical aspects of the model are also discussed.

  4. Anisotropic Dark Energy Bianchi Type III Cosmological Models in Brans Dicke Theory of Gravity

    CERN Document Server

    Shamir, M Farasat; 10.1139/P2012-007

    2012-01-01

    The main purpose of this paper is to explore the solutions of Bianchi type $III$ cosmological model in Brans Dicke theory of gravity in the background of anisotropic dark energy. We use the assumption of constant deceleration parameter and power law relation between scalar field $\\phi$ and scale factor $a$ to find the solutions. The physical behavior of the solutions has been discussed using some physical quantities.

  5. Accelerated Dilatonic-Brans-Dicke cyclic and non-singular universe from string theory

    Institute of Scientific and Technical Information of China (English)

    Ahmad Rami El-Nabulsi

    2011-01-01

    We discuss the late-time dynamics of a particular four-dimensional BransDicke cosmology with a dilaton field motivated by string theories (solitonic p-branes or D-branes) in which the dilaton field and the scale factor of the flat,homogeneous spacetime are correlated.We examine the late-time-evolution of the equations of motion where various attractive consequences are revealed and discussed in some detail.

  6. Production of an X-band horn after a design of Dick Turrin, W2IMU

    Science.gov (United States)

    Monstein, Christian

    2015-08-01

    While looking for a nice, easy to perform and cheap students' project in 2009, we investigated X-band (8 to 12 GHz) microwave devices. A 5 m parabolic dish antenna and an X-band down-converter were already available, but we had no antenna feed in our tool box. A web search yielded a simple feed horn design and found sketches and descriptions by Dick Turrin (W2IMU) from 1991.

  7. Inflation Cosmological Solutions in Two-Dimensional Brans-Dicke Gravity Model

    Institute of Scientific and Technical Information of China (English)

    2007-01-01

    The purpose of this paper is to study cosmological properties of two-dimensional Brans-Dicke gravity model. For massless scalar field, the new cosmological solutions are found by integration of field equation, these solutions correspond to the inflation solutions with positive cosmological constant. The result of this paper show that the inflation process of universe is controlled by the classical and quantum effect of the scalar field.

  8. An Archetypal Approach to Dick Diver in Tender Is the Night

    Institute of Scientific and Technical Information of China (English)

    ZHANG Dan

    2016-01-01

    Dick Diver, originally a young and promising doctor and psychoanalyst, is on his way to a glamorous future, but he gradually reduces himself to drinking, cursing and drifting away in the society. Following his life journey—his love, his mar-riage, his fall and ruin, we readers can easily associate him with some important characters taken from Greek mythology:Apol-lo, Dionysus and Daedalus.

  9. G\\"odel and G\\"odel-type universes in Brans-Dicke theory

    CERN Document Server

    Agudelo, J A; Petrov, A Yu; Porfírio, P J; Santos, A F

    2016-01-01

    In this paper, conditions for existence of G\\"{o}del and G\\"{o}del-type solutions in Brans-Dicke (BD) scalar-tensor theory and their main features are studied. The special attention is paid to consistency of equations of motion, causality, existence of CTCs (closed time-like curves) and to the role which cosmological constant and Mach principle play to achieve the consistency of this model.

  10. Relationship of DUI recidivism to moral reasoning, sensation seeking, and MacAndrew alcoholism scores.

    Science.gov (United States)

    Little, G L; Robinson, K D

    1989-12-01

    115 convicted male DUI offenders were treated with Moral Reconation Therapy during their incarceration. Postrelease recidivism status (arrests) was correlated with the pretest, posttest, and change scores on the MacAndrew Alcoholism Scale, Sensation Seeking Scale, Life-purpose scores, and Moral Reasoning scores. Analysis showed that recidivism correlated positively and significantly with the pretest scores on the MacAndrew scale and approached significance with both pre- and posttest scores on the Sensation Seeking Scale. Recidivism status correlated negatively and significantly with scores on the highest levels of moral reasoning (Scale 6 pretest and posttest and Principled Reasoning pretest).

  11. Analyzing after-action reports from Hurricanes Andrew and Katrina: repeated, modified, and newly created recommendations.

    Science.gov (United States)

    Knox, Claire Connolly

    2013-01-01

    Thirteen years after Hurricane Andrew struck Homestead, FL, Hurricane Katrina devastated the Gulf Coast of Mississippi, Alabama, and southeastern Louisiana. Along with all its destruction, the term "catastrophic" was redefined. This article extends the literature on these hurricanes by providing a macrolevel analysis of The Governor's Disaster Planning and Response Review Committee Final Report from Hurricane Andrew and three federal after-action reports from Hurricane Katrina, as well as a cursory review of relevant literature. Results provide evidence that previous lessons have not been learned or institutionalized with many recommendations being repeated or modified. This article concludes with a discussion of these lessons, as well as new issues arising during Hurricane Katrina.

  12. Cosmological constant in the Bianchi type-I-modified Brans–Dicke cosmology

    Indian Academy of Sciences (India)

    A K Azad; J N Islam

    2003-01-01

    In 1961, Brans and Dicke [1] provided an interesting alternative to general relativity based on Mach’s principle. To understand the reasons leading to their field equations, we first consider homogeneous and isotropic cosmological models in the Brans–Dicke theory. Accordingly we start with the Robertson–Walker line element and the energy tensor of a perfect fluid. The scalar field is now a function of the cosmic time only. Then we consider spatially homogeneous and anisotropic Bianchi type-I-cosmological solutions of modified Brans–Dicke theory containing barotropic fluid. These have been obtained by imposing a condition on the cosmological parameter (). Again we try to focus the meaning of this cosmological term and to relate it to the time coordinate which gives us a collapse singularity or the initial singularity. On the other hand, our solution is a generalization of the solution found by Singh and Singh [2]. As far as we are aware, such solution has not been given earlier.

  13. The Chameleon Effect in the Jordan Frame of the Brans--Dicke Theory

    CERN Document Server

    Quiros, Israel; Gonzalez, Tame; Horta-Rangel, F Antonio

    2015-01-01

    In this paper we investigate the chameleon effect in the different conformal frames of the Brans--Dicke theory. Given that, in the standard literature on the subject, the chameleon is described in the Einstein frame almost exclusively, here we pay special attention to the description of this effect in the Jordan and in the string frames. It is shown that, in general, terrestrial and solar system bounds on the mass of the BD scalar field, and bounds of cosmological origin, are difficult to reconcile at once through a single chameleon potential. We point out that, in a cosmological context, provided that the effective chameleon potential has a minimum within a region of constant density of matter, the Brans--Dicke theory transmutes into general relativity with a cosmological constant, in that region. This result, however, can be only locally valid. In cosmological settings de Sitter--general relativity is a global attractor of the Brans--Dicke theory only for the quadratic potential $V(\\phi)=M^2\\phi^2$, or for ...

  14. Regular Solutions in Vacuum Brans-Dicke Theory Compared to Vacuum Einstein Theory

    Directory of Open Access Journals (Sweden)

    Alina Khaybullina

    2013-01-01

    Full Text Available We will confront some static spherically symmetric vacuum Brans-Dicke solutions in the Jordan and Einstein Frames with the Robertson parameters. While the regular solution in the vacuum Einstein theory is just the Schwarzschild black hole, the same in the Jordan frame Brans-Dicke theory is shown to represent not a black hole but a traversable wormhole. But, in this case, the valid range of ω becomes too narrow to yield the observed weak field Robertson parameters at the positive mass mouth. The corresponding solution in the Einstein frame also provides a regular wormhole, and it yields the correct parametric values but only up to “one and half order.” We argue that a second-order contribution can in principle distinguish between the signatures of the regular wormhole and the singular Buchdahl solution in the Einstein frame. Thus, at the level of regular solutions, Brans-Dicke theory in each frame predicts effects very different from those of Einstein's theory. To our knowledge, these theoretical distinctions seem not to have received adequate attention so far.

  15. Brans-Dicke Theory with Λ>0: Black Holes and Large Scale Structures.

    Science.gov (United States)

    Bhattacharya, Sourav; Dialektopoulos, Konstantinos F; Romano, Antonio Enea; Tomaras, Theodore N

    2015-10-30

    A step-by-step approach is followed to study cosmic structures in the context of Brans-Dicke theory with positive cosmological constant Λ and parameter ω. First, it is shown that regular stationary black-hole solutions not only have constant Brans-Dicke field ϕ, but can exist only for ω=∞, which forces the theory to coincide with the general relativity. Generalizations of the theory in order to evade this black-hole no-hair theorem are presented. It is also shown that in the absence of a stationary cosmological event horizon in the asymptotic region, a stationary black-hole horizon can support a nontrivial Brans-Dicke hair. Even more importantly, it is shown next that the presence of a stationary cosmological event horizon rules out any regular stationary solution, appropriate for the description of a star. Thus, to describe a star one has to assume that there is no such stationary horizon in the faraway asymptotic region. Under this implicit assumption generic spherical cosmic structures are studied perturbatively and it is shown that only for ω>0 or ω≲-5 their predicted maximum sizes are consistent with observations. We also point out how, many of the conclusions of this work differ qualitatively from the Λ=0 spacetimes.

  16. Classical and Quantum Solutions in Brans-Dicke Cosmology with a Perfect Fluid

    CERN Document Server

    Paliathanasis, Andronikos; Basilakos, Spyros; Barrow, John D

    2015-01-01

    We consider the application of group invariant transformations in order to constrain a flat isotropic and homogeneous cosmological model, containing of a Brans-Dicke scalar field and a perfect fluid with a constant equation of state parameter $w$, where the latter is not interacting with the scalar field in the gravitational action integral. The requirement that the Wheeler-DeWitt equation be invariant under one-parameter point transformations provides us with two families of power-law potentials for the Brans-Dicke field, in which the powers are functions of the Brans-Dicke parameter $\\omega_{BD}$ and the parameter $w$. The existence of the Lie symmetry in the Wheeler-DeWitt equation is equivalent to the existence of a conserved quantity in field equations and with oscillatory terms in the wavefunction of the universe. This enables us to solve the field equations. For a specific value of the conserved quantity, we find a closed-form solution for the Hubble factor, which is equivalent to a cosmological model ...

  17. 改良Dick器械(Dick-Hou器械)治疗腰椎滑脱症

    Institute of Scientific and Technical Information of China (English)

    徐久祥; 冷辉; 赵吉连; 巴树桐

    2001-01-01

    目的 探讨改良Dick器械(Dick-Hou器械)后路治疗腰椎滑脱症内固定的力学特点及临床价值、方法 通过对腰椎滑脱症发病机理的探讨,总结33例应用改良Dick器械(Dick-Hou器械)治疗腰椎滑脱症的治疗经验。结果 平均随访1.5年,优良率93.9%,无差者。结论 改良Dick器械(Dick-Hou器械)不仅具有Dick器械的纵向撑开功能,同时又具有横向提拉功能,完全可以满足椎体复位的要求,效果满意,是一种比较理想的治疗腰椎滑脱症的内固定器。

  18. Holographic dark energy in Brans-Dicke theory with logarithmic form of scalar field

    CERN Document Server

    Singh, C P

    2016-01-01

    In this paper, an interacting holographic dark energy model with Hubble horizon as an infra-red cut-off is considered in the framework of Brans-Dicke theory. We propose a logarithmic form $\\phi \\propto ln(\\alpha+\\beta a)$ of the Brans-Dicke scalar field to alleviate the problems of interacting holographic dark energy models in Brans-Dicke theory. We find that the equation of state parameter $w_h$ and deceleration parameter $q$ are negative in the early time which shows the early time inflation. During the evolution the sign of parameter $q$ changes from negative to positive which means that the Universe expands with decelerated rate whereas the sign of $w_h$ may change or remain negative throughout the evolution depending on the values of parameters. It is also observed that $w_h$ may cross the phantom divide line in the late time evolution. The sign of $q$ changes from positive to negative during late time of evolution which explains the late time accelerated expansion of the Universe. Thus, we present a uni...

  19. The Concurrent and Construct Validity of the MacAndrew Alcoholism Scale among At-Risk Adolescent Males.

    Science.gov (United States)

    Moore, Richard H.

    1984-01-01

    Investigated the empirical validity of the MacAndrew Alcoholism Scale in adolescent male offenders (N=160). Results supported the concurrent validity of the MacAndrew Scale as a measure of alcohol abuse among young at-risk males and was also sensitive to polydrug use among youth who abuse alcohol. (LLL)

  20. Environmental Assessment, Managing Flight Obstructions to Preserve Safety at Andrews Air Force Base

    Science.gov (United States)

    2002-12-01

    rubbernecking ”), creating brief periods of minor, localized congestion. Other Off-Base Land: Equipment could have to be briefly and temporarily staged on...motorists to briefly reduce their speed (“ rubbernecking ”), creating brief periods of minor, localized congestion. Alternative 3 Andrews AFB

  1. A Proof of George Andrews' and David Robbins' $q$-TSPP Conjecture

    CERN Document Server

    Koutschan, Christoph; Zeilberger, Doron

    2010-01-01

    The conjecture that the orbit-counting generating function for totally symmetric plane partitions can be written as an explicit product-formula, has been stated independently by George Andrews and David Robbins around 1983. We present a proof of this long-standing conjecture.

  2. Because Everyone Has a Story to Tell: Interview with Andrew Wright

    Science.gov (United States)

    Floris, Flora Debora

    2016-01-01

    This article presents an interview with Andrew Wright, a widely recognized author, illustrator, storyteller, and teacher trainer. Wright has published many ELT books, authored six "Spellbinder" graded readers (1992-1994), and a collection of short stories. As a teacher trainer, Wright worked extensively with both teachers and students in…

  3. Commentary on Andrew Coulson's "Comparing Public, Private, and Market Schools: The International Evidence"

    Science.gov (United States)

    Wolfram, Gary; Coulson, Andrew J.

    2009-01-01

    In this article, the authors comment on Andrew Coulson's "Comparing Public, Private, and Market Schools: The International Evidence." The authors believe that Coulson's paper is a very interesting review of the literature on the ability of market-produced education to outperform government-produced education. Coulson's response on this commentary…

  4. Elliptic solutions of generalized Brans-Dicke gravity with a non-universal coupling

    Energy Technology Data Exchange (ETDEWEB)

    Alimi, J.M.; Reverdy, V. [Observatoire de Paris, Laboratoire Univers et Theories (LUTh), Meudon (France); Golubtsova, A.A. [Observatoire de Paris, Laboratoire Univers et Theories (LUTh), Meudon (France); Peoples' Friendship University of Russia, Institute of Gravitation and Cosmology, Moscow (Russian Federation)

    2014-10-15

    We study a model of the generalized Brans-Dicke gravity presented in both the Jordan and in the Einstein frames, which are conformally related. We show that the scalar field equations in the Einstein frame are reduced to the geodesics equations on the target space of the nonlinear sigma model. The analytical solutions in elliptical functions are obtained when the conformal couplings are given by reciprocal exponential functions. The behavior of the scale factor in the Jordan frame is studied using numerical computations. For certain parameters the solutions can describe an accelerated expansion. We also derive an analytical approximation in exponential functions. (orig.)

  5. Ultrathin atomic vapor film transmission spectroscopy: analysis of Dicke narrowing structure

    Institute of Scientific and Technical Information of China (English)

    Yuanyuan Li; Yanpeng Zhang; Chenli Gan

    2005-01-01

    Transmission sub-Doppler spectroscopy with confined atomic vapor film between two dielectric walls is theoretically studied. Because of atoms flying from wall to wall, where they get de-excited, the atomfield interaction time is anisotropic so that the contribution of slow atoms is enhanced, a sub-Doppler transmission spectroscopy (Dicke narrowing effect) can be obtained when the thickness of the film is much small or comparable with the wavelength even at small angle oblique incidence. It is feasible to get a sub-Doppler structure in a new region (L <λ/4) in experiments.

  6. 2PN/RM gauge invariance in Brans-Dicke-like scalar-tensor theories

    CERN Document Server

    Minazzoli, Olivier

    2012-01-01

    In this note we study the 2PN/RM gauge invariance structure of a \\textit{Brans-Dicke-like} Scalar-Tensor Theories (STT) without potential. Since the spherical isotropic metric plays an important role in the literature, its 2PN/RM STT version is deduced from the general equations given in \\cite{moiCQG11}, by using the invariance structure properties. It is found that the second order Eddington parameter $\\epsilon$ can be written in terms of the usual post-Newtonian parameter $\\gamma$ and $\\beta$ as $ \\epsilon=4/3 \\gamma^2 + 4/3 \\beta - 1/6 \\gamma -3/2$

  7. Sub-Doppler Cavity Cooling Beyond The Lamb-Dicke Limit

    CERN Document Server

    Chuah, Boon Leng; Cazan, Radu; Barrett, Murray D

    2013-01-01

    We investigate the dynamics of cavity cooling of a single ion beyond the Lamb-Dicke regime and demonstrate a cooling limit of approximately 50% of the Doppler temperature using a high finesse cavity for the first time. We also study the statistical properties of the ion-cavity emission and present a model that maps the phonon states to the photon states. With this model, we explain the super-Poissonian photon distribution observed in our experiments and propose a method to estimate the ion temperature in a real-time manner based on the statistical behavior of the photon emission from the cavity.

  8. The Open-System Dicke-Model Quantum Phase Transition with a Sub-Ohmic Bath

    CERN Document Server

    Nagy, D

    2015-01-01

    We show that the critical exponent of a quantum phase transition in a damped-driven open system is determined by the spectral density function of the reservoir. We consider the open-system variant of the Dicke model, where the driven boson mode and also the large N-spin couple to independent reservoirs at zero temperature. The critical exponent, which is $1$ if there is no spin-bath coupling, decreases below 1 when the spin couples to a sub-Ohmic reservoir.

  9. Controlled Dicke Subradiance from a Large Cloud of Two-Level Systems

    CERN Document Server

    Bienaime, Tom; Kaiser, Robin

    2012-01-01

    Dicke superradiance has been observed in many systems and is based on constructive interferences between many scattered waves. The counterpart of this enhanced dynamics, subradiance, is a destructive interference effect leading to the partial trapping of light in the system. In contrast to the robust superradiance, subradiant states are fragile and spurious decoherence phenomena hitherto obstructed the observation of such metastable states. We show that a dilute cloud of cold atoms is an ideal system to look for subradiance in free space and study various mechanisms to control this subradiance.

  10. String cosmological models in the Brans-Dicke theory for five-dimensional space-time

    Institute of Scientific and Technical Information of China (English)

    Koijam Manihar Singh; Kangujam Priyokumar Singh

    2012-01-01

    Five-dimensional space-time string cosmological models generated by a cloud of strings with particles attached to them are studied in the Brans-Dicke theory.We obtain two types of interesting models by taking up the cases of geometric strings (or Nambu strings) and p-strings (Takabayasi strings),and study their different physical and dynamical properties.The roles of the scalar field in getting different phases,such as the inflationary phase and the string-dominated phase,are discussed.An interesting feature obtained here is that in one of the models there is a "bounce" at a particular instant of its evolution.

  11. Inflationary phase in Brans-Dicke cosmology with a cosmological constant

    Science.gov (United States)

    Berman, Marcelo Samuel

    1989-12-01

    It has been shown earlier that, for a perfect fluid, a perfect gas law of state, and the Robertson-Walker metric, an exponential phase in Brans-Dicke cosmology is possible, with both positive pressure and density, but not with the violated energy condition p = -ρ. We demonstrate in this paper that the inclusion of a cosmological constant into the theory does not change that picture. Permanent address: Departamento de Ciencias Exatas da Faculdade de Filosofia, Ceincias e Letras da FURJ, Joinville, SC 89200, Brazil.

  12. Uniqueness of the Machian Solution in the Brans-Dicke Theory

    OpenAIRE

    Miyazaki, A

    2001-01-01

    Machian solutions of which the scalar field exhibits the asymptotic behavior $\\phi =O(\\rho /\\omega)$ are generally explored for the homogeneous and isotropic universe in the Brans-Dicke theory. It is shown that the Machian solution is unique for the closed and the open space. Such a solution is restricted to one that satisfies the relation $GM/c^{2}a=const$, which is fixed to $\\pi $ in the theory for the closed model. Another type of solution satisfying $\\phi =O(\\rho /\\omega)$ with the arbitr...

  13. Deterministic distribution of four-photon Dicke state over an arbitrary collective-noise channel with cross-Kerr nonlinearity

    Science.gov (United States)

    Wang, Mei-Yu; Yan, Feng-Li; Gao, Ting

    2016-07-01

    We present two deterministic quantum entanglement distribution protocols for a four-photon Dicke polarization entangled state resorting to the frequency and spatial degrees of freedom, which are immune to an arbitrary collective-noise channel. Both of the protocols adopt the X homodyne measurement based on the cross-Kerr nonlinearity to complete the task of the single-photon detection with nearly unit probability in principle. After the four receivers share the photons, they add some local unitary operations to obtain a standard four-photon Dicke polarization entangled state.

  14. Simple Approach to the Solution of a Trapped and Radiated Cold Ion Beyond the Lamb-Dicke Limit

    Institute of Scientific and Technical Information of China (English)

    FENG Mang; SHI Lei; GAO Ke-Lin; ZHU Xi-Wen

    2002-01-01

    Trapping ions outside the Lamb-Dicke limit have been proven to be useful for the laser-cooling and quantum computing.Under the supposition of the Rabi frequency much smaller than the Lamb Dicke parameter,we can use a simple method to analytically solve the system with a single cold ion trapped and radiated beyond the Lamb Dickc limit,in the absence of the rotating-wave approximation (RWA).Discussion has been made for the limitation of our approach and the comparison of our results with the solutions under the RWA.

  15. A scheme for detecting the atom-field coupling constant in the Dicke superradiation regime using hybrid cavity optomechanical system.

    Science.gov (United States)

    Wang, Yueming; Liu, Bin; Lian, Jinling; Liang, Jiuqing

    2012-04-23

    We proposed a scheme for detecting the atom-field coupling constant in the Dicke superradiation regime based on a hybrid cavity optomechanical system assisted by an atomic gas. The critical behavior of the Dicke model was obtained analytically using the spin-coherent-state representation. Without regard to the dynamics of cavity field an analytical formula of one-to-one correspondence between movable mirror's steady position and atom-field coupling constant for a given number of atoms is obtained. Thus the atom-field coupling constant can be probed by measuring the movable mirror's steady position, which is another effect of the cavity optomechanics. © 2012 Optical Society of America

  16. Supersymmetric analogs of the Gordon-Andrews identities, and related TBA systems

    CERN Document Server

    Melzer, E

    1994-01-01

    The Gordon-Andrews identities, which generalize the Rogers-Ramanujan-Schur identities, provide product and fermionic forms for the characters of the minimal conformal field theories (CFTs) M(2, 2k+1). We discuss/conjecture identities of a similar type, providing two different fermionic forms for the characters of the models SM(2,4k) in the minimal series of N=1 super-CFTs. These two forms are related to two families of thermodynamic Bethe Ansatz (TBA) systems, which are argued to be associated with the \\hat{\\phi}_{1,3}^{\\rm top}- and \\hat{\\phi}_{1,5}^{\\rm bot}-perturbations of the models SM(2,4k). Certain other q-series identities and TBA systems are also discussed, as well as a possible representation-theoretical consequence of our results, based on Andrews's generalization of the Gollnitz-Gordon theorem.

  17. Video produced for Andrew Lankford's talk at Google's Zeitgeist event on 2010.

    CERN Multimedia

    ATLAS Experiment

    2011-01-01

    A video made for the ATLAS talk at Google's Zeitgeist event during fall 2010, given by deputy spokesperson Andrew Lankford. The event, organized by Google, invited leaders of our time to discuss perspectives on global issues. For more information about the event go to http://www.zeitgeistminds.com/about/. The recording of the talk is available at: http://www.youtube.com/watch?v=VjIJS8zUimU

  18. Andrew Cunningham, The Anatomist Anatomis’d: An Experimental Discipline in Enlightenment Europe

    OpenAIRE

    Talairach-Vielmas, Laurence

    2013-01-01

    After his fascinating The Anatomical Renaissance: The Resurrection of the Anatomical Projects of the Ancients (1997), Andrew Cunningham offers us a new study of anatomy, The Anatomist Anatomis’d: An Experimental Discipline in Enlightenment Europe. This time, Cunningham looks at how anatomists contributed to the creation of anatomy as a discipline in the long eighteenth century, the “Enlightenment” being a time when the discipline flourished as never before or since. Thus anatomy, throughout t...

  19. Dessler, Jimenez, Klein, and Nenes Receive 2012 Atmospheric Sciences Ascent Awards: Citation for Andrew E. Dessler

    Science.gov (United States)

    Webster, Peter J.

    2013-11-01

    The Atmospheric Sciences section of AGU awards one of the four Ascent Awards to Professor Andrew E. Dessler of the Department of Atmospheric Sciences at Texas A&M University for fundamental contributions to the understanding of stratospheric-tropospheric exchange processes and the physics of ozone depletion and for attempts to unravel water vapor and cloud feedbacks in the climate system. In addition, he is commended for his ceaseless work in communicating the science of climate change to the public.

  20. Robert Dicke and the naissance of experimental gravity physics, 1957-1967

    Science.gov (United States)

    Edwin Peebles, Phillip James

    2016-10-01

    The experimental study of gravity became much more active in the late 1950s, a change pronounced enough be termed the birth, or naissance, of experimental gravity physics. I present a review of developments in this subject since 1915, through the broad range of new approaches that commenced in the late 1950s, and up to the transition of experimental gravity physics to what might be termed a normal and accepted part of physical science in the late 1960s. This review shows the importance of advances in technology, here as in all branches of natural science. The role of contingency is illustrated by Robert Dicke's decision in the mid-1950s to change directions in mid-career, to lead a research group dedicated to the experimental study of gravity. The review also shows the power of nonempirical evidence. Some in the 1950s felt that general relativity theory is so logically sound as to be scarcely worth the testing. But Dicke and others argued that a poorly tested theory is only that, and that other nonempirical arguments, based on Mach's Principle and Dirac's Large Numbers hypothesis, suggested it would be worth looking for a better theory of gravity. I conclude by offering lessons from this history, some peculiar to the study of gravity physics during the naissance, some of more general relevance. The central lesson, which is familiar but not always well advertised, is that physical theories can be empirically established, sometimes with surprising results.

  1. Gravitational radiation from compact binary systems in the massive Brans-Dicke theory of gravity

    CERN Document Server

    Alsing, Justin; Will, Clifford; Zaglauer, Helmut

    2011-01-01

    We derive the equations of motion, the periastron shift, and the gravitational radiation damping for quasicircular compact binaries in a massive variant of the Brans-Dicke theory of gravity. We also study the Shapiro time delay and the Nordtvedt effect in this theory. By comparing with recent observational data, we put bounds on the two parameters of the theory: the Brans-Dicke coupling parameter \\omega_{BD} and the scalar mass m_s. We find that the most stringent bounds come from Cassini measurements of the Shapiro time delay in the Solar System, that yield a lower bound \\omega_{BD}>40000 for scalar masses m_s1000 for m_s1250 for m_s<10^{-20} eV. A first estimate suggests that bounds comparable to the Shapiro time delay may come from observations of radiation damping in the eccentric white dwarf-neutron star binary PSR J1141-6545, but a quantitative prediction requires the extension of our work to eccentric orbits.

  2. Gravitational Collapse In Husain Space-time For Brans-Dicke Gravity Theory

    CERN Document Server

    Rudra, Prabir; Debnath, Ujjal

    2013-01-01

    The motive of this work is to study gravitational collapse in Husain space-time, in Brans-Dicke gravity theory. Among many scalar-tensor theories of gravity, Brans-Dicke is the simplest and the impact of it can be regulated by two parameters, coupling constant $\\omega$, and the assumed field dependency parameter $n$. V. Husain's work on exact solution for null fluid collapse in 1996 has influenced many authors to follow his way to find the end-state of the homogeneous/inhomogeneous dust cloud collapse using Vaidya's metric. Detecting whether the cosmological singularity is naked or wrapped by an event horizon, by the existence of future directed radial null geodesic emitted in past from the singularity is the basic objective. To point out the existence of positive trajectory tangent solution, both particular parametric cases (through tabular forms) and wide range contouring process have been applied. Precisely, perfect fluid's EoS ($p=k\\rho$) satisfies a wide range of phenomena: from dust to exotic fluid like...

  3. Phase transition of charged Black Holes in Brans-Dicke theory through geometrical thermodynamics

    Science.gov (United States)

    Hendi, S. H.; Panahiyan, S.; Panah, B. Eslam; Armanfard, Z.

    2016-07-01

    In this paper, we take into account black hole solutions of Brans-Dicke-Maxwell theory and investigate their stability and phase transition points. We apply the concept of geometry in thermodynamics to obtain phase transition points and compare its results with those, calculated in the canonical ensemble through heat capacity. We show that these black holes enjoy second order phase transitions. We also show that there is a lower bound for the horizon radius of physical charged black holes in Brans-Dicke theory, which originates from restrictions of positivity of temperature. In addition, we find that employing a specific thermodynamical metric in the context of geometrical thermodynamics yields divergencies for the thermodynamical Ricci scalar in places of the phase transitions. It will be pointed out that due to the characteristic behavior of the thermodynamical Ricci scalar around its divergence points, one is able to distinguish the physical limitation point from the phase transitions. In addition, the free energy of these black holes will be obtained and its behavior will be investigated. It will be shown that the behavior of the free energy in the place where the heat capacity diverges demonstrates second order phase transition characteristics.

  4. Observational constraints of the gravitational waves in the Brans-Dicke theory

    Energy Technology Data Exchange (ETDEWEB)

    Freitas, Rodolfo Camargo de; Goncalves, Sergio Vitorino de Borba [Universidade Federal do Espirito Santo (UFES), ES (Brazil). Dept. de Fisica. Grupo de Gravitacao e Cosmologia

    2011-07-01

    Full text: The cosmic inflation, which is the hypotheses that the early Universe has passed by a period of exponential expansion, is currently the most accepted and studied theory to explain the early fluctuations which evolved to the large scales structures which we observe today. The gravitational waves, when detected, can give us important information about inflation. In this work we investigate the quantum origin of the primordial cosmological gravitational waves in the Brans-Dicke theory. We compute the number of gravitons N{sub k} produced during the extended inflation and the three observables: the power spectrum P{sub T}, the spectral index n{sub T} and the energy density of the gravitational waves {Omega}{sub k}. By comparison with general relativity we see that the results for both theories are the same for the case of the particles number N{sub k} and for the case of the power spectrum P{sub T} and the energy density {Omega}{sub k} only when the Brans-Dicke coupling parameter {omega} has a value less than 10. For the spectral index n{sub T} we found that when {omega} is bigger than unity the spectral index approximates the expression found in the General Relativity. This may awake us to the possibility that {omega} varies with the cosmological scale. (author)

  5. Non-equilibrium dynamical phases of the two-atom Dicke model

    Energy Technology Data Exchange (ETDEWEB)

    Bhattacherjee, Aranya B.

    2014-09-12

    In this paper, we investigate the non-equilibrium dynamical phases of the two-atom Dicke model, which can be realized in a two species Bose–Einstein condensate interacting with a single light mode in an optical cavity. Apart from the usual non-equilibrium normal and inverted phases, a non-equilibrium mixed phase is possible which is a combination of normal and inverted phase. A new kind of dynamical phase transition is predicted from non-superradiant mixed phase to the superradiant phase which can be achieved by tuning the two different atom–photon couplings. We also show that a dynamical phase transition from the non-superradiant mixed phase to the superradiant phase is forbidden for certain values of the two atom–photon coupling strengths. - Highlights: • We investigate the non-equilibrium dynamical phases of the two-atom Dicke model. • The dynamical phase diagram reveals a new kind of non-equilibrium mixed phase. • A new kind of dynamical phase transition is predicted from mixed phase to the superradiant phase. • In the dynamical phase diagram of the mixed phase, there are regions where the superradiant phase cannot exist.

  6. Stellar explosion in the weak field approximation of the Brans-Dicke theory

    Energy Technology Data Exchange (ETDEWEB)

    Hamity, Victor H; Barraco, Daniel E [FaMAF, Universidad Nacional de Cordoba, Ciudad Universitaria, Cordoba 5000 (Argentina)

    2005-10-07

    We treat a very crude model of an exploding star, in the weak field approximation of the Brans-Dicke theory, in a scenario that resembles some characteristic data of a type Ia supernova. The most noticeable feature, in the electromagnetic component, is the relationship between the absolute magnitude at maximum brightness of the star and the decline rate in one magnitude from that maximum. This characteristic has become one of the most accurate methods to measure luminosity distances to objects at cosmological distances (Phillips M M 1993 Astrophys. J. 413 L105; see www.all-science-fair-projects.com/ science{sub f}air{sub p}rojects{sub e}ncyclopedia/Supernova, for a brief description of supernovae types). An interesting result is that the active mass associated with the scalar field is totally radiated to infinity, representing a mass loss in the ratio of the 'tensor' component to the scalar component of 1 to (2{omega} + 3) ({omega} is the Brans-Dicke parameter), in agreement with a general result of Hawking (1972 Commun. Math. Phys. 25 167). Then, this model shows explicitly, in a dynamical case, the mechanism of the radiation of a scalar field, which is necessary to understand the Hawking result.

  7. Digital-analog quantum simulation of generalized Dicke models with superconducting circuits

    Science.gov (United States)

    Lamata, Lucas

    2017-01-01

    We propose a digital-analog quantum simulation of generalized Dicke models with superconducting circuits, including Fermi- Bose condensates, biased and pulsed Dicke models, for all regimes of light-matter coupling. We encode these classes of problems in a set of superconducting qubits coupled with a bosonic mode implemented by a transmission line resonator. Via digital-analog techniques, an efficient quantum simulation can be performed in state-of-the-art circuit quantum electrodynamics platforms, by suitable decomposition into analog qubit-bosonic blocks and collective single-qubit pulses through digital steps. Moreover, just a single global analog block would be needed during the whole protocol in most of the cases, superimposed with fast periodic pulses to rotate and detune the qubits. Therefore, a large number of digital steps may be attained with this approach, providing a reduced digital error. Additionally, the number of gates per digital step does not grow with the number of qubits, rendering the simulation efficient. This strategy paves the way for the scalable digital-analog quantum simulation of many-body dynamics involving bosonic modes and spin degrees of freedom with superconducting circuits. PMID:28256559

  8. Effects of anisotropy on interacting ghost dark energy in Brans-Dicke theories

    Science.gov (United States)

    Hossienkhani, H.; Fayaz, V.; Azimi, N.

    2017-03-01

    In this work we concentrate on the ghost dark energy model within the framework of the Brans-Dicke theory in an anisotropic Universe. Within this framework we discuss the behavior of equation of state, deceleration and dark energy density parameters of the model. We consider the squared sound speed and quest for signs of stability of the model. We also probe observational constraints by using the latest observational data on the ghost dark energy models as the unification of dark matter and dark energy. In order to do so, we focus on observational determinations of the Hubble expansion rate (namely, the expansion history) H(z). Then we evaluate the evolution of the growth of perturbations in the linear regime for both ghost DE and Brans-Dicke theory and compare the results with standard FRW and ΛCDM models. We display the effects of the anisotropy on the evolutionary behavior the ghost DE models where the growth rate is higher in this models. Eventually the growth factor for the ΛCDM Universe will always fall behind the ghost DE models in an anisotropic Universe.

  9. Digital-analog quantum simulation of generalized Dicke models with superconducting circuits

    Science.gov (United States)

    Lamata, Lucas

    2017-03-01

    We propose a digital-analog quantum simulation of generalized Dicke models with superconducting circuits, including Fermi- Bose condensates, biased and pulsed Dicke models, for all regimes of light-matter coupling. We encode these classes of problems in a set of superconducting qubits coupled with a bosonic mode implemented by a transmission line resonator. Via digital-analog techniques, an efficient quantum simulation can be performed in state-of-the-art circuit quantum electrodynamics platforms, by suitable decomposition into analog qubit-bosonic blocks and collective single-qubit pulses through digital steps. Moreover, just a single global analog block would be needed during the whole protocol in most of the cases, superimposed with fast periodic pulses to rotate and detune the qubits. Therefore, a large number of digital steps may be attained with this approach, providing a reduced digital error. Additionally, the number of gates per digital step does not grow with the number of qubits, rendering the simulation efficient. This strategy paves the way for the scalable digital-analog quantum simulation of many-body dynamics involving bosonic modes and spin degrees of freedom with superconducting circuits.

  10. Brans-Dicke inflation in light of the Planck 2015 data

    CERN Document Server

    Tahmasebzadeh, B; Karami, K

    2016-01-01

    We study inflation in the Brans-Dicke gravity as a special model of the scalar-tensor gravity. We obtain the inflationary observables containing the scalar spectral index, the tensor-to-scalar ratio, the running of the scalar spectral index and the equilateral non-Gaussianity parameter in terms of the general form of the potential in the Jordan frame. Then, we compare the results for various inflationary potentials in light of the Planck 2015 data. Our study shows that in the Brans-Dicke gravity, the power-law, inverse power-law and exponential potentials are ruled out by the Planck 2015 data. But, the hilltop, Higgs, Coleman-Weinberg and natural potentials can be compatible with Planck 2015 TT,TE,EE+lowP data at 95\\% CL. Moreover, the D-brane, SB SUSY and displaced quadratic potentials can be in well agreement with the observational data since their results can lie inside the 68\\% CL region of Planck 2015 TT,TE,EE+lowP data.

  11. Bianchi type I anisotropic universe and stability interacting ghost dark energy in Brans-Dicke theories

    CERN Document Server

    Hossienkhani, Hossien

    2016-01-01

    A spatially homogeneous and anisotropic Bianchi type I universe has been studied with the ghost dark energy (GDE) in the framework of Brans-Dicke theory. For this purpose, we use the squared sound speed $v_s^2$ whose sign determines the stability of the model. At first, we obtain the equation of state parameter, $\\omega_\\Lambda$, the deceleration parameter $q$ and the evolution equation of the ghost dark energy. Then, we extend our study to the case of ghost dark energy in a non-isotropic and Brans-Dicke framework and find out that the transition of $\\omega_\\Lambda$ to the phantom regime can be more easily accounted for than when it is restored into the Einstein field equations. Our numerical result show the effects of the interaction and anisotropic on the evolutionary behaviour the ghost dark energy models. In conclusion, we find evidence that the ghost dark energy in BD theory can lead to a stable universe favored by observations at the present time.

  12. Andrew Wyeth and N.C. Wyeth: a psychodynamic perspective on father and son.

    Science.gov (United States)

    Shaw, Jon A

    2013-01-01

    This paper examines the relationship between two extraordinary artists, father and son--N.C. Wyeth (1882-1945) and Andrew Wyeth (1917-2009)--and their art. N.C. Wyeth, the father, the most famous illustrator of his day, painted scenes full of drama and action, often of men engaged in violent life and death struggles. N.C. was unable to separate from his powerful mother and yearned for his iconic father. He thought himself an artistic failure and dedicated himself to raising his children to be geniuses. The youngest son, Andrew Wyeth, who lived a "secret life," painted scenes often characterized by pathos: bleak and barren landscapes, leaden skies, tire tracks, gray framed houses, desiccated fields, and circling buzzards. In the father-son relationship, we often seen three themes perpetuated developmentally: (1) the son's identification with the innermost conflicts of his father; (2) the yearning for the iconic father of his youth; and (3) a continuation and disavowal of his father's life. These themes are played out in the relationship between Andrew Wyeth and his father.

  13. 78 FR 6173 - Diana Del Grosso, Ray Smith, Joseph Hatch, Cheryl Hatch, Kathleen Kelley, Andrew Wilklund, and...

    Science.gov (United States)

    2013-01-29

    ... From the Federal Register Online via the Government Publishing Office ] DEPARTMENT OF TRANSPORTATION Surface Transportation Board Diana Del Grosso, Ray Smith, Joseph Hatch, Cheryl Hatch, Kathleen... Smith, Joseph Hatch, Cheryl Hatch, Kathleen Kelley, Andrew Wilklund, and Richard Kosiba...

  14. USA asepresident: Venemaa kahjustas tõsiselt oma usaldusväärsust ja mainet / Dick Cheney

    Index Scriptorium Estoniae

    Cheney, Dick

    2008-01-01

    USA asepresident Dick Cheney ütles Itaalias Ambrosetti foorumil peetud kõnes, et Venemaa agressiivsed sammud on õõnestanud suhteid Ühendriikidega ja tugevdanud muret, mida paljud tunnevad Venemaa üldisemate eesmärkide pärast

  15. USA asepresident: Venemaa kahjustas tõsiselt oma usaldusväärsust ja mainet / Dick Cheney

    Index Scriptorium Estoniae

    Cheney, Dick

    2008-01-01

    USA asepresident Dick Cheney ütles Itaalias Ambrosetti foorumil peetud kõnes, et Venemaa agressiivsed sammud on õõnestanud suhteid Ühendriikidega ja tugevdanud muret, mida paljud tunnevad Venemaa üldisemate eesmärkide pärast

  16. Gravitational Collapse in Husain space-time for Brans-Dicke Gravity Theory with Power-law Potential.

    Science.gov (United States)

    Rudra, Prabir

    2016-07-01

    The motive of this work is to study gravitational collapse in Husain space-time in Brans-Dicke gravity theory. Among many scalar-tensor theories of gravity, Brans-Dicke is the simplest and the impact of it can be regulated by two parameters associated with it, namely, the Brans-Dicke parameter, ω, and the potential-scalar field dependency parameter 'n' respectively. V. Husain's work on exact solution for null fluid collapse in 1996 has influenced many authors to follow his way to find the end-state of the homogeneous/inhomogeneous dust cloud. Vaidya's metric is used all over to follow the nature of future outgoing radial null geodesics. Detecting whether the central singularity is naked or wrapped by an event horizon, by the existence of future directed radial null geodesic emitted in past from the singularity is the basic objective. To point out the existence of positive trajectory tangent solution, both particular parametric cases(through tabular forms) and wide range contouring process have been applied. Precisely, perfect fluid's equation of state satisfies a wide range of phenomena : from dust to exotic fluid like dark energy. We have used the equation of state parameter 'k' to determine the end state of collapse in different cosmological era. Our main target is to check low ω (more deviations from Einstein gravity-more Brans Dicke effect) and negative 'k' zones. This particularly throws light on the nature of the end-state of collapse in accelerated expansion in Brans Dicke gravity. It is seen that for positive values of EoS parameter 'k', the collapse results in a black hole, whereas for negative values of 'k', naked singularity is the only outcome. It is also to be noted that "low ω" leads to the possibility of getting more naked singularities even for a non-accelerating universe.

  17. Dilatonic Brans-Dicke Anisotropic Collapsing Fluid Sphere And de Broglie Quantum Wave Motion

    Science.gov (United States)

    Ghaffarnejad, Hossein

    2016-08-01

    Two dimensional (2D) analogue of vacuum sector of the Brans Dicke (BD) gravity [1] is studied to obtain dynamics of anisotropic spherically symmetric perfect fluid. Our obtained static solutions behave as dark matter with state equation but in non-static regimes behave as regular perfect fluid with barotropic index ϒ > 0. Positivity property of total mass of the fluid causes that the BD parameter to be ω >2/3 and/or ω 0 the apparent horizon is covered by event horizon where the cosmic censorship hypothesis is still valid. According to the model [1], we obtain de Broglie pilot wave of our metric solution which describes particles ensemble which become distinguishable via different values of ω. Incident current density of particles ensemble on the horizons is evaluated which describe the ‘Hawking radiation’. The de Brogle-Bohm quantum potential effect is calculated also on the event (apparent) horizon which is independent (dependent) to values of ω.

  18. Dynamics of axial symmetric system in self-interacting Brans-Dicke gravity

    Energy Technology Data Exchange (ETDEWEB)

    Sharif, M. [University of the Punjab, Department of Mathematics, Lahore (Pakistan); Manzoor, Rubab [University of Management and Technology, Department of Mathematics, Lahore (Pakistan)

    2016-06-15

    This paper investigates the dynamics of an axial reflection symmetric model in self-interacting Brans-Dicke gravity for anisotropic fluid. We formulate hydrodynamical equations and discuss oscillations using a time-dependent perturbation for both spin-dependent and spin-independent cases. The expressions of the frequency, the total energy density, and the equation of motion of the oscillating model are obtained. We study the instability of the oscillating models in weak approximations. It is found that the oscillations and stability of the model depend upon the dark energy source along with anisotropy and reflection effects. We conclude that the axial reflection system remains stable for stiffness parameter Γ = 1, collapses for Γ > 1, and becomes unstable for 0 < Γ < 1. (orig.)

  19. Long-lived mesoscopic entanglement outside the Lamb-Dicke regime

    CERN Document Server

    McDonnell, M J; Lucas, D M; Imreh, G; Keitch, B C; Szwer, D J; Thomas, N R; Webster, S C; Stacey, D N; Steane, A M

    2006-01-01

    We create entangled states of the spin and motion of a single $^{40}$Ca$^+$ ion in a linear ion trap. The motional part consists of coherent states of large separation and long coherence time. The states are created by driving the motion using a laser standing wave. We theoretically study and experimentally observe the behaviour outside the Lamb-Dicke regime, where the trajectory in phase space is modified and the coherent states become squeezed. We directly observe the modification of the return time of the trajectory, and infer the squeezing. The mesoscopic entanglement is observed up to $\\Delta \\alpha = 5.1$ with coherence time $170 \\mu$s and mean phonon excitation $\

  20. Two-photon spectroscopy of trapped HD$^+$ ions in the Lamb-Dicke regime

    CERN Document Server

    Tran, Vu Quang; Douillet, Albane; Koelemeij, Jeroen C J; Hilico, Laurent

    2013-01-01

    We study the feasibility of nearly-degenerate two-photon rovibrational spectroscopy in ensembles of trapped, sympathetically cooled hydrogen molecular ions using a resonance-enhanced multiphoton dissociation (REMPD) scheme. Taking advantage of quasi-coincidences in the rovibrational spectrum, the excitation lasers are tuned close to an intermediate level to resonantly enhance two-photon absorption. Realistic simulations of the REMPD signal are obtained using a four-level model that takes into account saturation effects, ion trajectories, laser frequency noise and redistribution of population by blackbody radiation. We show that the use of counterpropagating laser beams enables optical excitation in an effective Lamb-Dicke regime. Sub-Doppler lines having widths in the 100 Hz range can be observed with good signal-to-noise ratio for an optimal choice of laser detunings. Our results indicate the feasibility of molecular spectroscopy at the $10^{-14}$ accuracy level for improved tests of molecular QED, a new det...

  1. Varying alpha and cosmic acceleration in Brans-Dicke-BSBM theory: stability analysis and observational tests

    CERN Document Server

    Farajollahi, H

    2012-01-01

    By integration of generalized BSBM and Brans-Dicke cosmological models, in this article, we investigate the theoretical framework of fine structure constant variation and current cosmic acceleration. We first develop a mathematical formalism to analyze the stability of the model. By employing observational data to constrain the model parameters, phase space description is performed and the attractor solutions of the model are detected. We then examine the model against observational data such as Hubble parameter dataset and quasar absorption spectra. The results confirms current universe acceleration and also predicts fine structure constant variation. Furthermore, extrapolation of the best fitted model in high redshift ($z> 15$) shows a significantly larger variation of fine structure constant in earlier epoch of the universe.

  2. Dark energy in five-dimensional Brans-Dicke cosmology with dimensional reduction

    Institute of Scientific and Technical Information of China (English)

    Ahmad Rami E1-Nabulsi

    2011-01-01

    We explore a 5D Brans-Dicke scalar cosmology by conjecturing that the four-dimensional Hubble parameter varies as H =εφs,ε ∈ R and s is some unknown power index and that the extra-dimensions compactify as the visible dimensions expand as b(t) ≈ ax(t),x ∈ R-.We mainly discuss the case x =-1.For critical values of ε close to unity,it was observed that the acceleration of the universe occurs at redshift close to z =0.8 which indicates that in our model,accelerated expansion of the universe began only recently.Several interesting points are revealed and discussed in some detail.

  3. Non-existence of Brans-Dicke theory in higher dimensional FRW universe

    Science.gov (United States)

    Çaǧlar, Halife; Aygün, Sezgin

    2016-06-01

    In this paper, we have studied exact solutions of Brans-Dicke (BD) theory for higher dimensional generalized Friedmann-Robertson-Walker (FRW) universe in the presence of strange quark matter (SQM) attached to the string cloud and domain walls. We have obtained that string tension density does not survive in this model. This result agrees with Kiran and Reddy, Krori et al., Sahoo and Mishra and Reddy. Also we have obtained constant scalar field in the presence of string cloud and domain walls. Then BD theory does not observe for higher dimensional FRW universe with SQM attached to the string cloud and domain walls. Our BD solutions turn into general relativity (GR). Finally, some physical properties are discussed.

  4. Axion-dilaton-modulus gravity theory of Brans-Dicke-type and conformal symmetry

    CERN Document Server

    Quirós, I

    2000-01-01

    Conformal symmetry is investigated within the context of axion-dilaton-modulus theory of gravity of Brans-Dicke-type. A distinction is made between general conformal symmetry and invariance under transformations of the physical units. The conformal degree of symmetry of the theory is studied when quantum fermion (lepton) modes with electromagnetic interaction are considered. Based on the requirement of invariance of the physical laws under general transformations of the units of measure, arguments are given that point at a matter action with non-minimal coupling of the dilaton to the matter fields as the most viable description of the world within the context of the model studied. The geometrical implications of the results obtained are discussed.

  5. Pryce-Hoyle Tensor in a Combined Einstein-Cartan-Brans-Dicke Model

    CERN Document Server

    Berman, Marcelo Samuel

    2008-01-01

    In addition to introducting matter injection through a scalar field determined by Pryce-Hoyle tensor, we also combine with a BCDE (Brans-Dicke and Einstein-Cartan) theory with lambda-term developed through Raychaudhuri's equation, for inflationary scenario. It involves a variable cosmological constant, which decreases with time, jointly with energy density, cosmic pressure, shear, vorticity, and Hubble's parameter, while the scale factor, total spin and scalar field increase exponentially. The post-inflationary fluid resembles a perfect one, though total spin grows, but the angular speed does not (Berman, 2007d). The Pryce-Hoyle tensor, which can measured by the number of injected particles per unit proper volume and time, can be neglected in the aftermath of inflation.

  6. Quantum logic gates with two-level trapped ions beyond Lamb-Dicke limit

    Institute of Scientific and Technical Information of China (English)

    Zheng Xiao-Juan; Luo Yi-Min; Cai Jian-Wu

    2009-01-01

    In the system with two two-level ions confined in a linear trap,this paper presents a simple scheme to realize the quantum phase gate(QPG)and the swap gate beyond the Lamb-Dicke(LD)limit.These two-qubit quantum logic gates only involve the internal states of two trapped ions.The scheme does not use the vibrational mode as the data bus and only requires a single resonant interaction of the ions with the lasers.Neither the LD approximation nor the auxiliary atomic level is needed in the proposed scheme.Thus the scheme is simple and the interaction time is very short,which is important in view of decoherence.The experimental feasibility for achieving this scheme is also discussed.

  7. Modified Holographic Ricci Dark Energy in Chameleon Brans-Dicke Cosmology and Its Thermodynamic Consequence

    Science.gov (United States)

    Jawad, A.; Chattopadhyay, S.; Bhattacharya, S.; Pasqua, A.

    2015-04-01

    The objective of this paper is to discuss the Chameleon Brans-Dicke gravity with non-minimally matter coupling of scalar field. We take modified Holographic Ricci dark energy model in this gravity with its energy density in interaction with energy density of cold dark matter. We assume power-law ansatz for scale factor and scalar field to discuss potential as well as coupling functions in the evolving universe. These reconstructed functions are plotted versus scalar field and time for different values of power component of scale factor n. We observe that potential and coupling functions represent increasing behavior, in particular, consistent results for a specific value of n. Finally, we have examined validity of the generalized second law of thermodynamics and we have observed its validity for all values of n. The financial Supported from Department of Science and Technology, Govt. of India under Project Grant No. SR/FTP/PS-167/2011 is thankfully acknowledged by SC

  8. Metric factorizability and equivalence of brane world models with Brans-Dicke theory

    CERN Document Server

    Chakraborty, Sumanta

    2015-01-01

    In the standard brane world models, the bulk metric ansatz is usually assumed to be factorizable in brane and bulk coordinates. However it is not self evident that it is always possible to factorize the bulk metric. Using gradient expansion scheme, which involves, expansion of bulk quantities in terms of the brane to bulk curvature ratio, as perturbative parameter, we have explicitly shown that upto second order in perturbative expansion, metric factorizability is a valid assumption. We have also argued from our result that the same should be true for all orders in the perturbation scheme. We further establish that the non-local terms present in the bulk gravitational field equation can be replaced by radion field and the effective action on the brane obtained thereof resembles Brans-Dicke theory of gravity.

  9. Modified Brans-Dicke cosmology with matter-scalar field interaction

    CERN Document Server

    Kofinas, Georgios; Saridakis, Emmanuel N

    2016-01-01

    We discuss the cosmological implications of an extended Brans-Dicke theory presented recently, in which there is an energy exchange between the scalar field and ordinary matter, determined by the theory. A new mass scale is generated in the theory which modifies the Friedmann equations with field-dependent corrected kinetic terms. In a radiation universe the general solutions are found and there are branches with complete removal of the initial singularity, while at the same time a transient accelerating period can occur within deceleration. Entropy production is also possible in the early universe. In the dust era, late-times acceleration has been found numerically in agreement with the correct behaviour of the density parameters and the dark energy equation of state, while the gravitational constant has only a slight variation over a large redshift interval in agreement with observational bounds.

  10. Many-Body Quantum Optics with Decaying Atomic Spin States: ($\\gamma$, $\\kappa$) Dicke model

    CERN Document Server

    Gelhausen, Jan; Strack, Philipp

    2016-01-01

    We provide a theory for quantum-optical realizations of the open Dicke model with internal, atomic spin states subject to uncorrelated, single-site spontaneous emission with rate $\\gamma$. This introduces a second decay channel for excitations to irreversibly dissipate into the environment, in addition to the photon loss with rate $\\kappa$. We compute the mean-field non-equilibrium steady states for spin and photon observables in the long-time limit, $t\\rightarrow \\infty$. Although $\\gamma$ does not conserve the total angular momentum of the spin array, we argue that our solution is exact in the thermodynamic limit, for the number of atoms $N\\rightarrow \\infty$. In light of recent and upcoming experiments realizing superradiant phase transitions using internal atomic states with pinned atoms in optical lattices, our work lays the foundation for the pursuit of a new class of open quantum magnets coupled to quantum light.

  11. Dynamics of Axial Symmetric System in Self-Interacting Brans-Dicke Gravity

    CERN Document Server

    Sharif, M

    2016-01-01

    This paper investigates dynamics of axial reflection symmetric model in self-interacting Brans-Dicke gravity for anisotropic fluid. We formulate hydrodynamical equations and discuss oscillations using time-dependent perturbation for both spin as well as spin-independent cases. The expressions of frequency, total energy density and equation of motion of oscillating model are obtained. We study instability of oscillating models in weak approximations. It is found that the oscillations and stability of the model depend upon the dark energy source along with anisotropy and reflection effects. We conclude that the axial reflection system remains stable for stiffness parameter $\\Gamma=1$, collapses for $\\Gamma>1$ and becomes unstable for $0<\\Gamma<1$.

  12. High-order corrections on the laser cooling limit in the Lamb-Dicke regime.

    Science.gov (United States)

    Yi, Zhen; Gu, Wen-Ju

    2017-01-23

    We investigate corrections on the cooling limit of high-order Lamb-Dicke (LD) parameters in the double electromagnetically induced transparency (EIT) cooling scheme. Via utilizing quantum interferences, the single-phonon heating mechanism vanishes and the system evolves to a double dark state, from which we will obtain the mechanical occupation on the single-phonon excitation state. In addition, the further correction induced by two-phonon heating transitions is included to achieve a more accurate cooling limit. There exist two pathways of two-phonon heating transitions: direct two-phonon excitation from the dark state and further excitation from the single-phonon excited state. By adding up these two parts of correction, the obtained analytical predictions show a well consistence with numerical results. Moreover, we find that the two pathways can destructively interfere with each other, leading to the elimination of two-phonon heating transitions and achieving a lower cooling limit.

  13. O absurdo em «Caieira», de Ricardo Guilherme Dicke

    Directory of Open Access Journals (Sweden)

    Hilda Gomes Dutra Magalhães

    2012-08-01

    Full Text Available Resumo: Nosso objetivo neste artigo consiste em analisar o espaço do absurdo no romance Caieira, do escritor matogrossense Ricardo Guilherme Dicke. Como suporte teóricometodológico, utilizamos as ideias sobre o absurdo de Camus. Durante a análise, percebemos que o espaço em que se desenvolvem as ações narradas em Caieira representa uma relação de dominação, em que os personagens são reduzidas a fantasmas ou objetos, presas num mundo de cal, árido de humanidade. Mesmo quando o personagem principal tenta reverter o quadro, acaba se transformando num reverso da mesma moeda, repetindo o modelo de dominação contra o qual se insurge, reeditando um ciclo de poder e dominação. Palavras-chave: Literatura brasileira; análise literária; absurdo; espaço.Abstract: Our aim in this paper is to analyze the space of the absurd at the novel Caieira, by Ricardo Guilherme Dicke, writer from Mato Grosso. As a theoretical-methodological support, we use the ideas of on the absurd presented by Camus. During the analysis, we find that the space in which the actions narrated in Caieira develop represents a relationship of domination, in which the characters are reduced to objects or ghosts, trapped in a world of lime, arid of humanity. Even when the main character tries to reverse the situation, eventually becoming a reverse of the same coin, repeating the pattern of domination against which it protests, reissuing a cycle of power and domination. Keywords: Brazilian literature; literary analysis; absurd; space.

  14. Ground-water data for the Riley and Andrews Resource Areas, southeastern Oregon

    Science.gov (United States)

    Townley, Paul J.; Soja, Constance M.; Sidle, W.C.

    1980-01-01

    Appraisals of the resources of selected management areas in eastern Oregon are being made by the U.S. Bureau of Land Mangement. To provide needed hydrologic information, the Bureau of Land Management requested the U.S. Geological Survey to inventory ground-water data for the Riley and Andrews Resource Areas. The inventory included field location of selected wells and springs; measurement of ground-water levels, temperatures, specific conductance, and pH; and the collection of ground-water samples from selected sources to determine dissolved chemical constituents.

  15. Cognition About the Creative Process – Interview With Dr Andrew P. Allen

    Directory of Open Access Journals (Sweden)

    Andrew P. Allen

    2016-11-01

    Full Text Available What is the relationship between the creative process and cognition and perception? Lynda Loughnane, a master’s student in Art and Process in Crawford College of Art and Design, Cork, Ireland interviewed Dr Andrew P. Allen about the subject. Areas covered include mindfulness, Type 1 and Type 2 thinking, stage theories of creativity, engagement with the art process and the artwork, phenomenology and consciousness with and without self report. The interview was constructed to cover a wide range of subject matter, so as to gather as much information as possible in layman's language about the cognitive process in relation to creativity and interaction with art.

  16. Andrew D. Morris, Colonial Project, National Game: A History of Baseball in Taiwan

    OpenAIRE

    Soldani, Jérôme

    2012-01-01

    American historian Andrew D. Morris, who has already published a thesis on physical culture(tiyu) under the Republic of China, now offers us the first social science work in a non-Chinese text specifically focusing on Taiwan’s “national sport” (guoqiu) – baseball. Colonial Project, National Game (2010), was preceded in 2007 by Taiwanese scholar Yu Jun-wei’s Playing in Isolation. But Yu’s approach was more that of a chronicler. He was strongest in denouncing the tricks and tactics worn threadb...

  17. Cognition About the Creative Process – Interview With Dr Andrew P. Allen

    Science.gov (United States)

    Allen, Andrew P.; Loughnane, Lynda

    2016-01-01

    What is the relationship between the creative process and cognition and perception? Lynda Loughnane, a master’s student in Art and Process in Crawford College of Art and Design, Cork, Ireland interviewed Dr Andrew P. Allen about the subject. Areas covered include mindfulness, Type 1 and Type 2 thinking, stage theories of creativity, engagement with the art process and the artwork, phenomenology and consciousness with and without self report. The interview was constructed to cover a wide range of subject matter, so as to gather as much information as possible in layman's language about the cognitive process in relation to creativity and interaction with art. PMID:27872674

  18. Tai Lands and Thailand. Community and State in Southeast Asia, Andrew Walker (éd.

    Directory of Open Access Journals (Sweden)

    Olivier Evrard

    2011-01-01

    Full Text Available Voici un ouvrage à lire en commençant par la fin, car l’argument principal se trouve exposé de façon plus claire et convaincante dans la conclusion que dans l’introduction. Pour Andrew Walker, une conception erronnée de la notion de communauté prévaut aujourd’hui parmi les universitaires et les ONG thaïs et elle explique en partie les tensions sociales et politiques que connaît la Thaïlande depuis 2006. Appartenance locale, économie de subsistance, maintien des savoirs traditionnels  : la com...

  19. Cognition About the Creative Process - Interview With Dr Andrew P. Allen.

    Science.gov (United States)

    Allen, Andrew P; Loughnane, Lynda

    2016-11-01

    What is the relationship between the creative process and cognition and perception? Lynda Loughnane, a master's student in Art and Process in Crawford College of Art and Design, Cork, Ireland interviewed Dr Andrew P. Allen about the subject. Areas covered include mindfulness, Type 1 and Type 2 thinking, stage theories of creativity, engagement with the art process and the artwork, phenomenology and consciousness with and without self report. The interview was constructed to cover a wide range of subject matter, so as to gather as much information as possible in layman's language about the cognitive process in relation to creativity and interaction with art.

  20. Transactions en eaux troubles : résurgences de la voix shakespearienne dans Moby-Dick Defamiliarising the Bard: The Resurgence of Shakespeare in Moby-Dick

    Directory of Open Access Journals (Sweden)

    Ronan Ludot-Vlasak

    2009-06-01

    Full Text Available This article explores the way Herman Melville appropriates William Shakespeare’s work in Moby-Dick. Its argument is that by defamiliarising some of Shakespeare’s lines—a corpus that was both alien and familiar to nineteenth-century writers— Melville turns them into his own idiom. This resurgence of the Shakespearean voice is double: although the dramatic element in the novel is often associated with the figure of Ahab, Ishmael also incorporates Shakespearean lines into his narrative. What characterises these (intertextual transactions is that instead of quoting directly from Shakespeare’s plays, Melville often blurs references in order to appropriate the works of his predecessor. More than the mere imitation of a model, this complex process reveals Shakespeare’s seminal role in Moby-Dick as well as Melville’s poetics of reinvention. Ultimately, it enables the author to explore the dark forces lying beneath the surface of things.

  1. Delayed tree mortality in the Atchafalaya Basin of Southern Louisiana following Hurricane Andrew

    Science.gov (United States)

    Keeland, B.D.; Gorham, L.E.

    2009-01-01

    Hurricanes can damage trees in forested wetlands, and the potential for mortality related to these storms exists due to the effects of tree damage over time. In August 1992, Hurricane Andrew passed through the forested wetlands of southern Louisiana with winds in excess of 225 kph. Although more than 78 of the basal area was destroyed in some areas, most trees greater than 2.5 cm dbh were alive and resprouting prolifically the following year (98.8). Survival of most tree species was similarly high two years after the hurricane, but mortality rates of some species increased dramatically. For example, Populus heterophylla (swamp cottonwood) mortality increased from 7.8 to 59.2 (n 76) and Salix interior (sandbar willow) mortality increased from 4.5 to 57.1 (n 21). Stem sprouts on many up-rooted hardwood trees of other species were still alive in 1998, 6 years after the hurricane. Due to the understory tree species composition, regeneration, and high levels of resprouting, there was little change in species composition or perhaps a slight shift toward more shade and flood tolerant species six years following the hurricane event. Triadica sebifera (Chinese tallow) was found on some of the sites heavily disturbed by Hurricane Andrew, and may proliferate at the expense of native tree species. ?? 2009 The Society of Wetland Scientists.

  2. ANDREWES'S CHRISTMAS FAIRY TALE: ATYPICAL THINKING ABOUT CANCER AETIOLOGY IN 1935.

    Science.gov (United States)

    Sankaran, Neeraja; van Helvoort, Ton

    2016-06-20

    This paper uses a short 'Christmas fairy-story for oncologists' sent by Christopher Andrewes with a 1935 letter to Peyton Rous as the centrepiece of a reflection on the state of knowledge and speculation about the viral aetiology of cancer in the 1930s. Although explicitly not intended for public circulation at the time, the fairy-story merits publication for its significance in the history of ideas about viruses, which are taken for granted today. Andrewes and Rous were prominent members of the international medical research community and yet faced strong resistance to their theory that viruses could cause such tumours as chicken sarcomas and rabbit papillomas. By looking at exchanges between these men among themselves and other proponents of their theories and with their oncologist detractors, we highlight an episode in the behind-the-scenes workings of medical science and show how informal correspondence helped keep alive a vital but then heterodox idea about the role of viruses in causing cancer.

  3. On the Crucial Cluster Andrews-Lindsay 1 and a 4% Distance Solution for its PN

    CERN Document Server

    Majaess, D; Bidin, C Moni; Bonatto, C; Turner, D; Moyano, M; Berdnikov, L; Giorgi, E

    2014-01-01

    Andrews-Lindsay 1 is a pertinent open cluster granted it may host the planetary nebula PHR 1315-6555, yet ambiguities linger concerning its fundamental parameters (>50% scatter). New multiband BVJHW(1-4) photometry for cluster and field stars, in concert with observations of recently discovered classical Cepheids, were used to constrain the reddening and velocity-distance profiles along the sight-line. That analysis yielded the following parameters for the cluster: E(J-H)=0.24+-0.03, d=10.0+-0.4 kpc (d(JH)=9.9+-0.6 kpc, d(BV)=10.1+-0.5 kpc), and log(t)=8.90+-0.15. The steep velocity-distance gradient along l~305 indicates that two remote objects sharing spatial and kinematic parameters (i.e., PHR 1315-6555 and Andrews-Lindsay 1) are associated, thus confirming claims that the PN is a cluster member (e.g., Parker et al.). The new distance for PHR 1315-6555 is among the most precise yet established for a Galactic PN (err_d=4%).

  4. Ecological evaluation of proposed dredged material from St. Andrew Bay, Florida

    Energy Technology Data Exchange (ETDEWEB)

    Mayhew, H.L.; Word, J.Q.; Kohn, N.P.; Pinza, M.R.; Karle, L.M.; Ward, J.A. [Battelle/Marine Sciences Lab., Sequim, WA (United States)

    1993-10-01

    The US Army Corps of Engineers (USACE), Mobile District, requested that the Battelle/Marine Sciences Laboratory (MSL) conduct field sampling and chemical and biological testing to determine the suitability of potential dredged material for open ocean disposal. Sediment from St. Andrew Bay was chemically characterized and evaluated for biological toxicity and bioaccumulation of contaminants. The Tier III guidance for ocean disposal testing requires tests of water column effects (following dredged material disposal), deposited sediment toxicity, and bioaccumulation of contaminants from deposited sediment (dredged material). To meet these requirements, the MSL conducted suspended-particulate-phase (SPP) toxicity tests, solid-phase toxicity tests, and bioaccumulation testing on sediment representing potential dredged material from Panama City Harbor. Physical and chemical characterization of sediment to support toxicity and bioaccumulation results was also conducted on both the test and reference sediments. The MSL collected sediment samples from five sites in St. Andrew Bay and one reference site near Lands End Peninsula. The five test sediments and the reference sediment were analyzed for physical and chemical sediment characteristics, SPP chemical contaminants, solid-phase toxicity, SPP toxicity, and bioaccumulation of contaminants.

  5. Thermodynamics of topological black holes in Brans-Dicke gravity with a power-law Maxwell field

    CERN Document Server

    Zangeneh, M Kord; Sheykhi, A

    2015-01-01

    In this paper, we present a new class of higher dimensional exact topological black hole solutions of the Brans-Dicke theory in the presence of a power-law Maxwell field as the matter source. For this aim, we introduce a conformal transformation which transforms the Einstein-dilaton-power-law Maxwell gravity Lagrangian to the Brans-Dicke-power-law Maxwell theory one. Then, by using this conformal transformation, we obtain the desired solutions. Next, we study the properties of the solutions and conditions under which we have black holes. Interestingly enough, we show that there is a cosmological horizon in the presence of a negative cosmological constant. Finally, we calculate the temperature and charge and then by calculating the Euclidean action, we obtain the mass, the entropy and the electromagnetic potential energy. We find that the entropy does not respect the area law, and also the conserved and thermodynamic quantities are invariant under conformal transformation. Using these thermodynamic and conserv...

  6. Study of Antigravity in an F(R Model and in Brans-Dicke Theory with Cosmological Constant

    Directory of Open Access Journals (Sweden)

    V. K. Oikonomou

    2014-01-01

    Full Text Available We study antigravity, that is, having an effective gravitational constant with a negative sign, in scalar-tensor theories originating from F(R theory and in a Brans-Dicke model with cosmological constant. For the F(R theory case, we obtain the antigravity scalar-tensor theory in the Jordan frame by using a variant of the Lagrange multipliers method and we numerically study the time dependent effective gravitational constant. As we will demonstrate by using a specific F(R model, although there is no antigravity in the initial model, it might occur or not in the scalar-tensor counterpart, mainly depending on the parameter that characterizes antigravity. Similar results hold true in the Brans-Dicke model.

  7. Study of Antigravity in an F(R) Model and in Brans-Dicke Theory with Cosmological Constant

    CERN Document Server

    Oikonomou, V K

    2014-01-01

    We study antigravity, that is having an effective gravitational constant with a negative sign, in scalar-tensor theories originating from $F(R)$-theory and in a Brans-Dicke model with cosmological constant. For the $F(R)$ theory case, we obtain the antigravity scalar-tensor theory in the Jordan frame by using a variant of the Lagrange multipliers method and we numerically study the time dependent effective gravitational constant. As we shall demonstrate by using a specific $F(R)$ model, although there is no antigravity in the initial model, it might occur or not in the scalar-tensor counterpart, mainly depending on the parameter that characterizes antigravity. Similar results hold true in the Brans-Dicke model.

  8. Exact solution for the inhomogeneous Dicke model in the canonical ensemble: Thermodynamical limit and finite-size corrections

    Energy Technology Data Exchange (ETDEWEB)

    Pogosov, W.V., E-mail: walter.pogosov@gmail.com [N.L. Dukhov All-Russia Research Institute of Automatics, Moscow (Russian Federation); Institute for Theoretical and Applied Electrodynamics, Russian Academy of Sciences, Moscow (Russian Federation); Moscow Institute of Physics and Technology, Dolgoprudny (Russian Federation); Shapiro, D.S. [N.L. Dukhov All-Russia Research Institute of Automatics, Moscow (Russian Federation); Moscow Institute of Physics and Technology, Dolgoprudny (Russian Federation); V.A. Kotel' nikov Institute of Radio Engineering and Electronics, Russian Academy of Sciences, Moscow (Russian Federation); National University of Science and Technology MISIS, Moscow (Russian Federation); Bork, L.V. [N.L. Dukhov All-Russia Research Institute of Automatics, Moscow (Russian Federation); Institute for Theoretical and Experimental Physics, Moscow (Russian Federation); Onishchenko, A.I. [Bogoliubov Laboratory of Theoretical Physics, Joint Institute for Nuclear Research, Dubna (Russian Federation); Moscow Institute of Physics and Technology, Dolgoprudny (Russian Federation); Skobeltsyn Institute of Nuclear Physics, Moscow State University, Moscow (Russian Federation)

    2017-06-15

    We consider an exactly solvable inhomogeneous Dicke model which describes an interaction between a disordered ensemble of two-level systems with single mode boson field. The existing method for evaluation of Richardson–Gaudin equations in the thermodynamical limit is extended to the case of Bethe equations in Dicke model. Using this extension, we present expressions both for the ground state and lowest excited states energies as well as leading-order finite-size corrections to these quantities for an arbitrary distribution of individual spin energies. We then evaluate these quantities for an equally-spaced distribution (constant density of states). In particular, we study evolution of the spectral gap and other related quantities. We also reveal regions on the phase diagram, where finite-size corrections are of particular importance.

  9. Exact solution for the inhomogeneous Dicke model in the canonical ensemble: Thermodynamical limit and finite-size corrections

    Directory of Open Access Journals (Sweden)

    W.V. Pogosov

    2017-06-01

    Full Text Available We consider an exactly solvable inhomogeneous Dicke model which describes an interaction between a disordered ensemble of two-level systems with single mode boson field. The existing method for evaluation of Richardson–Gaudin equations in the thermodynamical limit is extended to the case of Bethe equations in Dicke model. Using this extension, we present expressions both for the ground state and lowest excited states energies as well as leading-order finite-size corrections to these quantities for an arbitrary distribution of individual spin energies. We then evaluate these quantities for an equally-spaced distribution (constant density of states. In particular, we study evolution of the spectral gap and other related quantities. We also reveal regions on the phase diagram, where finite-size corrections are of particular importance.

  10. Anisotropic string cosmological model in Brans–Dicke theory of gravitation with time-dependent deceleration parameter

    Energy Technology Data Exchange (ETDEWEB)

    Maurya, D. Ch., E-mail: dcmaurya563@gmail.com; Zia, R., E-mail: rashidzya@gmail.com; Pradhan, A., E-mail: pradhan.anirudh@gmail.com [GLA University, Department of Mathematics, Institute of Applied Sciences and Humanities (India)

    2016-10-15

    We discuss a spatially homogeneous and anisotropic string cosmological models in the Brans–Dicke theory of gravitation. For a spatially homogeneous metric, it is assumed that the expansion scalar θ is proportional to the shear scalar σ. This condition leads to A = kB{sup m}, where k and m are constants. With these assumptions and also assuming a variable scale factor a = a(t), we find solutions of the Brans–Dicke field equations. Various phenomena like the Big Bang, expanding universe, and shift from anisotropy to isotropy are observed in the model. It can also be seen that in early stage of the evolution of the universe, strings dominate over particles, whereas the universe is dominated by massive strings at the late time. Some physical and geometrical behaviors of the models are also discussed and observed to be in good agreement with the recent observations of SNe la supernovae.

  11. Evaluation of the frequency instability limited by Dick effect in the microwave 199Hg+ trapped-ion clock

    Science.gov (United States)

    Chen, Yi-He; She, Lei; Wang, Man; Yang, Zhi-Hui; Liu, Hao; Li, Jiao-Mei

    2016-12-01

    In the microwave 199Hg+ trapped-ion clock, the frequency instability degradation caused by the Dick effect is unavoidable because of the periodical interrogating field. In this paper, the general expression of the sensitivity function g(t) to the frequency fluctuation of the interrogating field with Nπ-pulse (N is odd) is derived. According to the measured phase noise of the 40.5-GHz microwave synthesizer, the Dick-effect limited Allan deviation of our 199Hg+ trapped-ion clock is worked out. The results indicate that the limited Allan deviations are about and respectively in the linear ion trap and in the two-segment extended linear ion trap under our present experimental parameters. Project supported by the National Natural Science Foundation of China (Grant Nos. 11074248 and 11474320).

  12. Preparation of Schr\\"odinger cat states with cold ions in a cavity beyond the Lamb-Dicke limit

    CERN Document Server

    Freitas, Dagoberto S

    2010-01-01

    We investigate the dynamics of a cold trapped ion coupled to the quantized field inside a high-finesse cavity. We have used an approach for preparing the SC states of motion of ion. This approach, based on unitary transformating the Hamiltonian, allows its exact diagonalization without performing the Lamb-Dicke aproximation. We show that is possible to generate a SC states having rather simple initial state preparation, e.g., the vacuum sate for both cavity field and the ion motion.

  13. Hierarchy problem and the cosmological constant in a five-dimensional Brans-Dicke brane world model

    CERN Document Server

    Smolyakov, Mikhail N

    2010-01-01

    We discuss a new solution, admitting the existence of dS_{4} branes, in five-dimensional Brans-Dicke theory. It is shown that, due to a special form of a bulk scalar field potential, for certain values of the model parameters the effective cosmological constant can be made small on the brane, where the hierarchy problem of gravitational interaction is solved. We also discuss new stabilization mechanism which is based on the use of auxiliary fields.

  14. The relationship of Nature and Man in Turner’s sea-scenes and Melville’s Moby-Dick

    Directory of Open Access Journals (Sweden)

    Réka Takacs Toth

    2010-07-01

    Full Text Available L´objectif de cette analyse est de révéler les parallèles entre les paysages maritimes du peintre anglais Joseph Mallord William Turner et le roman de Herman Melville intitulé Moby-Dick. L´analyse se concentre sur la représentation de la relation entre l´Homme et la Nature chez les deux artistes ; une relation qui est devenue assez problématique à la suite de l´industrialisation rapide du XIXe siècle. Bien que Melville connût à peine les oeuvres de Turner lorsqu´il écrivait Moby-Dick, la représentation de la relation de l´homme face à la nature chez l´écrivain américain est très semblable à celle présente dans les oeuvres du peintre anglais.The study aims to analyze parallels between the sea-scenes of the English painter, Joseph Mallord William Turner and the American writer, Herman Melville’s Moby-Dick with an eye on how the two artists conceived the relationship of Man and Nature which became quite problematic as the result of a rapid industrialization that characterized the nineteenth century. Although Melville was only vaguely familiar with Turner’s art at the time when he wrote Moby-Dick, the American writer represented man in relation to nature in quite the same way as the English painter did a few years before him.

  15. A Derivation of the Dick Effect from Control-Loop Models for Periodically Interrogated Passive Frequency Standards

    Science.gov (United States)

    Greenhall, Charles A.

    1996-01-01

    The phase of a frequency standard that uses periodic interrogation and control of a local oscillator (LO) is degraded by a long-term random-walk component induced by downconversion of LO noise into the loop passband. The Dick formula for the noise level of this degradation can be derived from explicit solotions of two LO control-loop models. A summary of the derivations is given here.

  16. Resonances of the confined hydrogen atom and the Lamb-Dicke effect in non-relativistic qed

    DEFF Research Database (Denmark)

    Faupin, Jeremy

    2008-01-01

    We study a model describing a system of one dynamical nucleus and one electron confined by their center of mass and interacting with the quantized electromagnetic field. We impose an ultraviolet cutoff and assume that the fine-structure constant is sufficiently small. Using a renormalization grou...... method (based on [3, 4]), we prove that the unperturbed eigenvalues turn into resonances when the nucleus and the electron are coupled to the radiation field. This analysis is related to the Lamb–Dicke effect....

  17. Electrostatic Potential of a Point Charge in a Brans-Dicke Reissner-Nordstr\\"{o}m Field

    CERN Document Server

    Watanabe, Maya

    2013-01-01

    We consider the Brans-Dicke Reissner-Nordstr\\"{o}m spacetime in isotropic coordinates and the electrostatic field of an electric point charge placed outside its surface of inversion. We treat the static electric point charge as a linear perturbation on the Brans-Dicke Reissner-Nordstr\\"{o}m background. We develop a method based upon the Copson method to convert the governing Maxwell equation on the electrostatic potential generated by the static electric point charge into a solvable linear second order ordinary differential equation. We obtain a closed form fundamental solution of the curved space Laplace equation arising from the background metric, which is shown to be regular everywhere except at the point charge and its image point inside the surface of inversion. We also develop a method that demonstrates that the solution does not contain any other charge that may creep into the region that lies beyond the surface of inversion and which is not covered by the isotropic coordinates. The Brans-Dicke Reissne...

  18. New holographic reconstruction of scalar-field dark-energy models in the framework of chameleon Brans-Dicke cosmology

    Energy Technology Data Exchange (ETDEWEB)

    Chattopadhyay, Surajit [Pailan College of Management and Technology, Kolkata (India); Pasqua, Antonio [University of Trieste, Department of Physics, Trieste (Italy); Khurshudyan, Martiros [Yerevan State University, Department of Theoretical Physics, Yerevan (Armenia); Potsdam-Golm Science Park, Max Planck Institute of Colloids and Interfaces, Potsdam (Germany)

    2014-09-15

    Motivated by the work of Yang et al. (Mod. Phys. Lett. A 26:191, 2011), we report on a study of the new holographic dark energy (NHDE) model with energy density given by ρ{sub D} = (3φ{sup 2})/(4ω)(μH{sup 2} + νH) in the framework of chameleon Brans-Dicke cosmology. We have studied the correspondence between the quintessence, the DBI-essence, and the tachyon scalar-field models with the NHDE model in the framework of chameleon Brans-Dicke cosmology. Deriving an expression of the Hubble parameter H and, accordingly, ρ{sub D} in the context of chameleon Brans-Dicke chameleon cosmology, we have reconstructed the potentials and dynamics for these scalar-field models. Furthermore, we have examined the stability for the obtained solutions of the crossing of the phantom divide under a quantum correction of massless conformally invariant fields, and we have seen that the quantum correction could be small when the phantom crossing occurs and the obtained solutions of the phantom crossing could be stable under the quantum correction. It has also been noted that the potential increases as the matter. chameleon coupling gets stronger with the evolution of the universe. (orig.)

  19. A conversation with Andrew Benson: reflections on the discovery of the Calvin-Benson cycle.

    Science.gov (United States)

    Benson, Andrew

    2013-03-01

    On June 26-27, 2012, one of us (BBB) made a video based on an interview conducted with Andrew A. Benson, Professor Emeritus, Scripps Institution of Oceanography, University of California, San Diego, CA, USA. The video was first shown in a seminar presented by BBB on July 27, 2012 at the Calvin Laboratory, University of California, Berkeley, to mark the departure of the Energy Biosciences Institute to a new building. Here we record the conversation taking place during the interview. The Brancraft Library on the Berkeley campus will house the video's transcript in its oral histories collection, and the video will be housed in its motion picture collection. The video and the transcript have also been posted on You Tube (http://youtu.be/GfQQJ2vR_xE).

  20. Children's predisaster functioning as a predictor of posttraumatic stress following Hurricane Andrew.

    Science.gov (United States)

    La Greca, A M; Silverman, W K; Wasserstein, S B

    1998-12-01

    This study examined (a) children's predisaster behavioral and academic functioning as a predictor of posttraumatic stress (PTS) following Hurricane Andrew and (b) whether children who were exposed to the disaster would display a worsening of prior functioning. Fifteen months before the disaster, 92 4th through 6th graders provided self-reports of anxiety; peers and teachers rated behavior problems (anxiety, inattention, and conduct) and academic skills. Measures were repeated 3 months postdisaster; children also reported PTS symptoms and hurricane-related experiences (i.e., exposure). PTS symptoms were again assessed 7 months postdisaster. At 3 months postdisaster, children's exposure to the disaster, as well as predisaster ratings of anxiety, inattention, and academic skills, predicted PTS symptoms. By 7 months, only exposure, African American ethnicity, and predisaster anxiety predicted PTS. Prior anxiety levels also worsened as a result of exposure to the disaster. The findings have implications for identifying and treating children at risk for stress reactions following a catastrophic disaster.

  1. Book Review of 'Evolutionary and Interpretive Archaeologies' Edited by Ethan E. Cochrane and Andrew Gardner

    CERN Document Server

    Gabora, Liane

    2015-01-01

    Evolutionary and Interpretive Archaeologies, edited by Ethan E. Cochrane and Andrew Gardner, grew out of a seminar at the Institute for Archaeology at University College London in 2007. It consists of 15 chapters by archaeologists who self-identify themselves as practitioners who emphasize the benefits of evolutionary or interpretive approaches to the study of the archaeological record. While the authors' theoretical views are dichotomous, the editors' aim for the book as a whole is not to expound on the differences between these two kinds of archaeology but to bring forward a richer understanding of the discipline and to highlight areas of mutual concern. Some chapters come across as a bit of a sales pitch, but the majority of the contributions emphasize how each approach can be productively used to address the goals of the other. The book seeks to contribute to a mutually beneficial and more productive discipline, and overall, it succeeds in this effort.

  2. Prosthetic rehabilitation of severe Siebert′s Class III defect with modified Andrews bridge system

    Directory of Open Access Journals (Sweden)

    Manu Rathee

    2015-01-01

    Full Text Available Prosthetic dentistry involves the replacement of missing and contiguous tissues with artificial substitutes to restore and maintain the oral functions, appearance, and health of the patient. The treatment of edentulous areas with ridge defects poses a challenging task for the dentist. Management of such cases involves a wide range of treatment options comprising mainly of surgical interventions and non surgical techniques such as use of removable, fixed or fixed- removable partial dentures. But each treatment plan undertaken should be customized according to patient needs. A variety of factors such as quality and quantity of existing contiguous hard and soft tissues, systemic condition and economic status of the patient play an important role in treatment planning, clinical outcome and prognosis. This case report presents the restoration of a Seibert′s Class III ridge defect by an economical modification of Andrews Bridge in a 32 Year old patient.

  3. Business closure and relocation: a comparative analysis of the Loma Prieta earthquake and Hurricane Andrew.

    Science.gov (United States)

    Wasileski, Gabriela; Rodríguez, Havidán; Diaz, Walter

    2011-01-01

    The occurrence of a number of large-scale disasters or catastrophes in recent years, including the Indian Ocean tsunami (2004), the Kashmir earthquake (2005), Hurricane Katrina (2005) and Hurricane Ike (2008), have raised our awareness regarding the devastating effects of disasters on human populations and the importance of developing mitigation and preparedness strategies to limit the consequences of such events. However, there is still a dearth of social science research focusing on the socio-economic impact of disasters on businesses in the United States. This paper contributes to this research literature by focusing on the impact of disasters on business closure and relocation through the use of multivariate logistic regression models, specifically focusing on the Loma Prieta earthquake (1989) and Hurricane Andrew (1992). Using a multivariate model, we examine how physical damage to the infrastructure, lifeline disruption and business characteristics, among others, impact business closure and relocation following major disasters.

  4. The post-disaster negative health legacy: pregnancy outcomes in Louisiana after Hurricane Andrew.

    Science.gov (United States)

    Antipova, Anzhelika; Curtis, Andrew

    2015-10-01

    Disasters and displacement increasingly affect and challenge urban settings. How do pregnant women fare in the aftermath of a major disaster? This paper investigates the effect of pregnancies in disaster situations. The study tests a hypothesis that pregnant women residing in hurricane-prone areas suffer higher health risks. The setting is Louisiana in the Gulf Coast, United States, a state that continually experiences hurricane impacts. The time period for the analysis is three years following the landfall of Hurricane Andrew in 1992. We analysed low birth weight and preterm deliveries before and after landfall, as a whole and by race. Findings support an association between hazards and health of a community and indicate that pregnant women in the affected area, irrespective of race, are more likely to experience preterm deliveries compared to pre-event births. Results suggest there is a negative health legacy impact in Louisiana as a result of hurricane landfall.

  5. Memorial Camels and Design by Committee: St Andrews Black Saturday Memorials

    Directory of Open Access Journals (Sweden)

    SueAnne Ware

    2015-02-01

    Full Text Available This paper examines a work in progress, the St Andrews Bushfire Memorial, which commemorates victims of the 7 February 2009 bushfires in Victoria, Australia. The paper’s intent is threefold: to describe and reflect on a current and ongoing memorial design project; to frame this project within a larger series of design discourses; and to examine the processes by which this memorial, but also many other grassroots or ‘bottom-up’ memorials, come into being. By examining the design process, I aim to open up various memorialisation and consultation methods for review. More importantly, however, by framing this project in contemporary discussions regarding socially engaged design practices, I offer a critique of the dictator–democrat binaries mentioned above and offer another way forward.

  6. Andrew Bernstein, Modern Passings. Death Rites, Politics and Social Change in Imperial Japan

    OpenAIRE

    Duteil-Ogata, Fabienne

    2010-01-01

    Andrew Bernstein, historien américain nous présente ici une étude portant sur une période charnière de l’histoire des funérailles au Japon : celle qui débute avec l’ère Meiji (1868-1912) et prend fin en 1945, la période du shintô d’État. Basé sur un travail minutieux de dépouillement de la presse nationale et locale, des archives officielles et des archives des premières sociétés de pompes funèbres, A. Bernstein nous montre comment, durant cette période, les funérailles n’échappent pas au pro...

  7. Sous l’empire de la folie : Moby-Dick, Shakespeare & compagnie

    Directory of Open Access Journals (Sweden)

    Michel Imbert

    2010-10-01

    Full Text Available This article aims at translating Moby-Dick back into Shakespeare’s ornate lingo, and back again into a Swiftian or Sternian brand of “jabberwocky,” in order to expose the sheer nonsense that underlies lame attempts at standing for the Body Politic called Leviathan, understanding it, or making sense of the whale as a whole.Melville emprunte à Shakespeare le motif de la volonté de puissance, du rêve d’empire sous l’emprise de la folie du pouvoir. Le drame d’Achab est de s’ériger en maître absolu face au Leviathan et de s’ignorer possédé par la folle du logis, l’hysterica passio qui habite Lear et qui lui souffle, dans tous les sens du terme, son rêve dément de domination. L’histoire cherche à se répéter sur le modèle des tragédies de Shakespeare mais finit par dégénérer en farce. Le délire de Pip achève de la faire sombrer dans le non-sens.

  8. Dilatonic Brans-Dicke Anisotropic Collapsing Fluid Sphere And de Broglie Quantum Wave Motion

    CERN Document Server

    Ghaffarnejad, Hossein

    2014-01-01

    Two dimensional analogue of vacuum sector of the Brans Dicke gravity is used to study dynamics of anisotropic spherical symmetric perfect fluid. We solve dynamical equations and obtain internal metric of the fluid describing a stellar collapse with equation of state as $\\rho(p)=2(p-p_0^3/p^3)$ for $\\omega>>1$. We determine time dependence oscillations of particles ensemble, apparent and event horizons location where the particles same as the event horizon are trapped by the apparent horizon and they are located on back of the apparent horizon. We determine radial accelerating velocity of the particles ensemble from the phase part of the corresponding de Broglie quantum wave of the fluid sphere. A good correspondence between our classical and de Broglie quantum wave solutions are obtained by overlapping diagram of the classical solutions of relative distance of the particles, apparent and event horizons with particles ensemble density where finally the particles together with the event horizon located back of ...

  9. 1/N-expansion for the Dicke model and the decoherence program

    CERN Document Server

    Frasca, M

    2004-01-01

    An analysis of the Dicke model, N two-level atoms interacting with a single radiation mode, is done using the Holstein-Primakoff transformation. The main aim of the paper is to show that, changing the quantization axis with respect to the common usage, it is possible to prove a general result either for N or the coupling constant going to infinity for the exact solution of the model. This completes the analysis, known in the current literature, with respect to the same model in the limit of N and volume going to infinity, keeping the density constant. For the latter the proper axis of quantization is given by the Hamiltonian of the two-level atoms and for the former the proper axis of quantization is defined by the interaction. The relevance of this result relies on the observation that a general measurement apparatus acts using electromagnetic interaction and so, one can states that the thermodynamic limit is enough to grant the appearance of classical effects. Indeed, recent experimental results give first ...

  10. Shear-free axial model in massive Brans-Dicke gravity

    Science.gov (United States)

    Sharif, M.; Manzoor, Rubab

    2017-01-01

    This paper explores the influences of dark energy on the shear-free axially symmetric evolution by considering self-interacting Brans-Dicke gravity as a dark energy candidate. We describe energy source of the model and derive all the effective dynamical variables as well as effective structure scalars. It is found that scalar field is one of the sources of anisotropy and dissipation. The resulting effective structure scalars help to study the dynamics associated with dark energy in any axial configuration. In order to investigate shear-free evolution, we formulate a set of governing equations along with heat transport equation. We discuss consequences of shear-free condition upon different SBD fluid models like dissipative non-geodesic and geodesic models. For dissipative non-geodesic case, the rotational distribution turns out to be the necessary and sufficient condition for radiating model. The dissipation depends upon inhomogeneous expansion. The geodesic model is found to be irrotational and non-radiating. The non-dissipative geodesic model leads to FRW model for positive values of the expansion parameter.

  11. Quantized Brans-Dicke theory: Phase transition, strong coupling limit, and general relativity

    Science.gov (United States)

    Pal, Sridip

    2016-10-01

    We show that Friedmann-Robertson-Walker geometry with a flat spatial section in quantized (Wheeler deWitt quantization) Brans-Dicke (BD) theory reveals a rich phase structure owing to anomalous breaking of a classical symmetry, which maps the scale factor a ↦λ a for some constant λ . In the weak coupling (ω ) limit, the theory goes from a symmetry preserving phase to a broken phase. The existence of a phase boundary is an obstruction to another classical symmetry [see V. Faraoni, Phys. Rev. D 59, 084021 (1999).] (which relates two BD theories with different couplings) admitted by BD theory with scale invariant matter content, i.e., Tμμ=0 . Classically, this prohibits the BD theory from reducing to general relativity (GR) for scale invariant matter content. We show that a strong coupling limit of both BD and GR preserves the symmetry involving the scale factor. We also show that with scale invariant matter content (radiation, i.e., P =1/3 ρ ), the quantized BD theory does reduce to GR as ω →∞ , which is in sharp contrast to classical behavior. This is a first known illustration of a scenario where quantized BD theory provides an example of anomalous symmetry breaking and resulting binary phase structure. We make a conjecture regarding the strong coupling limit of the BD theory in a generic scenario.

  12. Shear-free axial model in massive Brans–Dicke gravity

    Energy Technology Data Exchange (ETDEWEB)

    Sharif, M., E-mail: msharif.math@pu.edu.pk [Department of Mathematics, University of the Punjab, Quaid-e-Azam Campus, Lahore-54590 (Pakistan); Manzoor, Rubab, E-mail: rubab.manzoor@umt.edu.pk [Department of Mathematics, University of the Punjab, Quaid-e-Azam Campus, Lahore-54590 (Pakistan); Department of Mathematics, University of Management and Technology, Johar Town Campus, Lahore-54782 (Pakistan)

    2017-01-15

    This paper explores the influences of dark energy on the shear-free axially symmetric evolution by considering self-interacting Brans–Dicke gravity as a dark energy candidate. We describe energy source of the model and derive all the effective dynamical variables as well as effective structure scalars. It is found that scalar field is one of the sources of anisotropy and dissipation. The resulting effective structure scalars help to study the dynamics associated with dark energy in any axial configuration. In order to investigate shear-free evolution, we formulate a set of governing equations along with heat transport equation. We discuss consequences of shear-free condition upon different SBD fluid models like dissipative non-geodesic and geodesic models. For dissipative non-geodesic case, the rotational distribution turns out to be the necessary and sufficient condition for radiating model. The dissipation depends upon inhomogeneous expansion. The geodesic model is found to be irrotational and non-radiating. The non-dissipative geodesic model leads to FRW model for positive values of the expansion parameter.

  13. Non-singular Brans–Dicke collapse in deformed phase space

    Energy Technology Data Exchange (ETDEWEB)

    Rasouli, S.M.M., E-mail: mrasouli@ubi.pt [Departamento de Física, Universidade da Beira Interior, Rua Marquês d’Avila e Bolama, 6200 Covilhã (Portugal); Centro de Matemática e Aplicações (CMA - UBI), Universidade da Beira Interior, Rua Marquês d’Avila e Bolama, 6200 Covilhã (Portugal); Physics Group, Qazvin Branch, Islamic Azad University, Qazvin (Iran, Islamic Republic of); Ziaie, A.H., E-mail: ah_ziaie@sbu.ac.ir [Department of Physics, Shahid Beheshti University, G. C., Evin, 19839 Tehran (Iran, Islamic Republic of); Department of Physics, Shahid Bahonar University, PO Box 76175, Kerman (Iran, Islamic Republic of); Jalalzadeh, S., E-mail: shahram.jalalzadeh@unila.edu.br [Federal University of Latin-American Integration, Technological Park of Itaipu PO box 2123, Foz do Iguaçu-PR, 85867-670 (Brazil); Moniz, P.V., E-mail: pmoniz@ubi.pt [Departamento de Física, Universidade da Beira Interior, Rua Marquês d’Avila e Bolama, 6200 Covilhã (Portugal); Centro de Matemática e Aplicações (CMA - UBI), Universidade da Beira Interior, Rua Marquês d’Avila e Bolama, 6200 Covilhã (Portugal)

    2016-12-15

    We study the collapse process of a homogeneous perfect fluid (in FLRW background) with a barotropic equation of state in Brans–Dicke (BD) theory in the presence of phase space deformation effects. Such a deformation is introduced as a particular type of non-commutativity between phase space coordinates. For the commutative case, it has been shown in the literature (Scheel, 1995), that the dust collapse in BD theory leads to the formation of a spacetime singularity which is covered by an event horizon. In comparison to general relativity (GR), the authors concluded that the final state of black holes in BD theory is identical to the GR case but differs from GR during the dynamical evolution of the collapse process. However, the presence of non-commutative effects influences the dynamics of the collapse scenario and consequently a non-singular evolution is developed in the sense that a bounce emerges at a minimum radius, after which an expanding phase begins. Such a behavior is observed for positive values of the BD coupling parameter. For large positive values of the BD coupling parameter, when non-commutative effects are present, the dynamics of collapse process differs from the GR case. Finally, we show that for negative values of the BD coupling parameter, the singularity is replaced by an oscillatory bounce occurring at a finite time, with the frequency of oscillation and amplitude being damped at late times.

  14. Quantum signature of chaos and thermalization in the kicked Dicke model

    Science.gov (United States)

    Ray, S.; Ghosh, A.; Sinha, S.

    2016-09-01

    We study the quantum dynamics of the kicked Dicke model (KDM) in terms of the Floquet operator, and we analyze the connection between chaos and thermalization in this context. The Hamiltonian map is constructed by suitably taking the classical limit of the Heisenberg equation of motion to study the corresponding phase-space dynamics, which shows a crossover from regular to chaotic motion by tuning the kicking strength. The fixed-point analysis and calculation of the Lyapunov exponent (LE) provide us with a complete picture of the onset of chaos in phase-space dynamics. We carry out a spectral analysis of the Floquet operator, which includes a calculation of the quasienergy spacing distribution and structural entropy to show the correspondence to the random matrix theory in the chaotic regime. Finally, we analyze the thermodynamics and statistical properties of the bosonic sector as well as the spin sector, and we discuss how such a periodically kicked system relaxes to a thermalized state in accordance with the laws of statistical mechanics.

  15. Non-singular Brans-Dicke collapse in deformed phase space

    CERN Document Server

    Rasouli, S M M; Jalalzadeh, S; Moniz, P V

    2016-01-01

    We study the collapse process of a homogeneous perfect fluid (in FLRW background) with a barotropic equation of state in Brans-Dicke (BD) theory in the presence of phase space deformation effects. Such a deformation is introduced as a particular type of non-commutativity between phase space coordinates. For the commutative case, it has been shown in the literature [M.A. Scheel, S.L. Shapiro and S.A. Teukolsky, Phys. Rev. D. 51, 4236 (1995)], that the dust collapse in BD theory leads to the formation of a spacetime singularity which is covered by an event horizon. In comparison to general relativity (GR), the authors concluded that the final state of black holes in BD theory is identical to the GR case but differs from GR during the dynamical evolution of the collapse process. However, the presence of non-commutative effects influences the dynamics of the collapse scenario and consequently a non-singular evolution is developed in the sense that a bounce emerges at a minimum radius, after which an expanding pha...

  16. Gravity-Driven Acceleration and Kinetic Inflation in Noncommutative Brans-Dicke Setting

    CERN Document Server

    Rasouli, S M M

    2016-01-01

    By assuming the spatially flat~FLRW line-element and employing the Hamiltonian formalism, a noncommutative (NC) setting of the Brans-Dicke (BD) theory is introduced. We investigate gravity-driven acceleration and kinetic inflation in this NC BD cosmology. Despite to the commutative case, in which both the scale factor and BD scalar field are obtained in power-law forms (in terms of the cosmic time), in our herein NC model, we see that the power-law scalar factor is multiplied by a dynamical exponential warp factor. This warp factor depends on not only the NC parameter but also the momentum conjugate associated to the BD scalar field. For very small values of this parameter, we obtain an appropriate inflationary solution, which can overcome the problems within the standard BD cosmology in a more efficient manner. Moreover, we see that a graceful exit from an early acceleration epoch towards a decelerating radiation epoch is provided. For late times, due to the presence of the NC parameter, we obtain a zero acc...

  17. D-class of dark energy against $\\Lambda$CDM in Brans-Dicke cosmology

    CERN Document Server

    Khodam-Mohammadi, A

    2016-01-01

    Three general models of dynamical interacting dark energy (D-class) are investigated in the context of Brans-Dicke cosmology. All cosmological quantities such as equation of state parameters, deceleration parameters, Hubble function, and the density ratio are calculated as a function of redshift parameter. The most important part of this paper is fitting of models to the observational data (SNIa+BAO$_A$+$Omh^{2}$). We obtain a table of best fit value of parameters and report $\\chi_{tot}^2/dof$ and Akaike Information Criterion (AIC) for each model. By these diagnostic tools, we find that some models have no chance against $\\Lambda$CDM and some (e.g. $\\mathcal{BD-D}C2$ and $\\mathcal{BD-D}A^*$) render the best fit quality. Specially, the value of AIC analysis and figures show that the interacting $\\mathcal{BD-D}C2$ model fit perfectly with overall data and reveals a strong evidence in favor of this model, against $\\Lambda$CDM.

  18. General Andrew Wauchope of Niddrie Marischal. A character sketch and brief historical tribute

    Directory of Open Access Journals (Sweden)

    Eric McPherson

    2012-02-01

    Full Text Available Two months after the outbreak of the Anglo-Boer War a series of battles took place which shook Britain. These were Stormberg (10 December1899, Magersfontein (11 December 1899 and Colenso (15 December 1899. All had been reverses for the British army and had taken place within a week which became known as Black Week - a phrase coined by the British Liberal Party politician Asquith. Great Britain was regarded as having the world's most powerful army at the time and the losses suffered against the Boers resulted in humiliation and anguish for the British nation. However, nowhere was the anguish greater than in Scotland for at Magersfontein the Highland Brigade had fared badly suffering severe losses including their commander, Major-General Andrew Wauchope, killed in action. As Conan Doyle put it, "Never has Scotland had a more grievous day than this at Magersfontein. She had always given her best blood with lavish generosity for the Empire, but it may be doubted if any single battle has ever put' so many families of high and low, into mourning from the Tweed to Caithness shore." (Doyle, 1900:24 In the words of biographer William Baird "the empire has lost one of its noblest and best, a hero has gone down to his rest ere his full life's work was done". (Baird, 1902:196 Although these statements may seem somewhat flowery and were expressed during a period of much patriotic fervour, they nevertheless indicate the emotional reaction to Andrew Wauchope's untimely death.

  19. 33 CFR 334.760 - Naval Support Activity Panama City and Alligator Bayou, a tributary of St. Andrew Bay, Fla...

    Science.gov (United States)

    2010-07-01

    ... 33 Navigation and Navigable Waters 3 2010-07-01 2010-07-01 false Naval Support Activity Panama City and Alligator Bayou, a tributary of St. Andrew Bay, Fla.; naval restricted area. 334.760 Section 334.760 Navigation and Navigable Waters CORPS OF ENGINEERS, DEPARTMENT OF THE ARMY, DEPARTMENT OF DEFENSE DANGER ZONE AND RESTRICTED AREA REGULATIONS...

  20. Should Community College Be Free? Forum. "Education Next" Talks with Sara Goldrick-Rab and Andrew P. Kelly

    Science.gov (United States)

    Goldrick-Rab, Sara; Kelly, Andrew P.

    2016-01-01

    In this article, "Education Next" talks with Sara Goldrick-Rab and Andrew Kelly. President Obama's proposal for tuition-free community college, seems to have laid down a marker for the Democratic Party. Vermont senator Bernie Sanders is touting his plan for free four-year public college on the primary trail; Massachusetts senator…

  1. The Former Miss Barstow with every Tom, Dick and Harry in a doll's house

    Directory of Open Access Journals (Sweden)

    Richard Newton

    2015-02-01

    Full Text Available Julie Holledge, panel chairperson and member of the International Ibsen Committee, invited myself along with 3 others to participate in the Inaugural Artists’ Keynote Panel: Applied Ibsen on Four Continents: The Artists’ Intentions. My presentation focused on “The Former Miss Barstow with every Tom, Dick and Harry in a doll’s house.” This was an adaptation of Ibsen’s “A Doll’s House” produced and staged in Los Angeles, California, 1987.  For the XIIIth International Ibsen Conference at the University of Tromsø, Norway, I projected images; a few found on the internet, and many from the production itself, as well as a video clip shown streaming live from YouTube. The article describes the social context of the 80s, analyzes the reinterpretation of Ibsen’s characters, and sets out to explain the symbology of the sets and costumes. I also touch on the differences between this production and Ibsen’s original in four important aspects. These would be the macaroons, the Tarantella, the silk stockings and the end of the play. Finally, I explain my decision to upload this version of “A Doll’s House,’ scene by scene, to my page on YouTube. Having shown films and videos for many years at festivals around the globe, I was looking for a way to step outside that box and reach an international audience just beyond my keyboard. In all of these ways, the goal has been to illuminate the ways in which an artist takes Ibsen’s text and applies it to the specific social context of their time and culture.

  2. Population structure of the wood-decay fungus Trichaptum abietinum (J. Dicks. Ryvarden in the Carpathian National Nature Park (Ukraine

    Directory of Open Access Journals (Sweden)

    Boiko Sergey M.

    2016-09-01

    Full Text Available This paper provides a list of intracellular isozyme systems of Trichaptum abietinum (J. Dicks. Ryvarden (Basidiomycetes that can be used for population studies. Population structure of the fungus within the Carpathian National Nature Park (CNNP was established. Percent of polymorphic loci in general was 83.3%. Groups of rare alleles were assigned Sod88, Sod138, Sdh191, and Est111. Calculated Wright's fixation index allowed establishing privilege of the heterozygotes on locus Acp and homozygotes on locus Sod. The population of T. abietinum in the CNNP was in equilibrium state.

  3. Study of Antigravity in an F(R) Model and in Brans-Dicke Theory with Cosmological Constant

    OpenAIRE

    2014-01-01

    We study antigravity, that is having an effective gravitational constant with a negative sign, in scalar-tensor theories originating from $F(R)$-theory and in a Brans-Dicke model with cosmological constant. For the $F(R)$ theory case, we obtain the antigravity scalar-tensor theory in the Jordan frame by using a variant of the Lagrange multipliers method and we numerically study the time dependent effective gravitational constant. As we shall demonstrate by using a specific $F(R)$ model, altho...

  4. New exact cosmological solutions to Brans-Dicke gravity with a self-interacting scalar-field

    CERN Document Server

    Arias, O; Arias, Olga; Quiros, Israel

    2002-01-01

    We derive a new parametric class of exact cosmological solutions to Brans-Dicke theory of gravity with a self-interacting scalar field and a barotropic perfect fluid of ordinary matter, by assuming a linear relationship between the Hubble expansion parameter and the time derivative of the scalar field. As a consequence only a class of exponential potentials and their combinations can be treated. The relevance of the solutions found for the description of the cosmic evolution are discussed in detail. We focus our discussion mainly on the possibility to have superquintessence behavior.

  5. The \\gamma\\ parameter in Brans-Dicke-like (light-)Scalar-Tensor theory with a universal scalar/matter coupling

    CERN Document Server

    Minazzoli, Olivier

    2013-01-01

    The post-Newtonian parameter \\gamma\\ resulting from a universal scalar/matter coupling is investigated in Brans-Dicke-like Scalar-Tensor theories where the scalar potential is assumed to be negligible. Conversely to previous studies, we use a perfect fluid formalism in order to get the explicit scalar-field equation. It is shown that the metric can be put in its standard post-Newtonian form. However, it is pointed out that 1-\\gamma\\ could be either positive, null or negative for finite value of \\omega_0, depending on the coupling function; while Scalar-Tensor theories without coupling always predict \\gamma<1 for finite value of \\omega_0.

  6. Fano-Agarwal couplings and non-rotating wave approximation in single-photon timed-Dicke subradiance

    OpenAIRE

    Mirza, Imran M.; Begzjav, Tuguldur

    2016-01-01

    Recently a new class of single-photon timed-Dicke (TD) subradiant states has been introduced with possible applications in single-photon based quantum information storage and on demand ultrafast retrieval [Scully M. O., Phys. Rev. Lett., 115 (2015) 243602]. However, the influence of any kind of virtual processes on the decay of these new kind of subradiant states has been left as an open question. In the present paper, we focus on this problem in detail. In particular, we investigate how pure...

  7. Book received: Alois Riegl, The Origins of Baroque Art in Rome, edited and translated by Andrew Hopkins and Arnold Witte, with essays by Alina Payne, Arnold Witte, and Andrew Hopkins; Los Angeles: Getty Research Institute including contents, acknowledgments and a note on the translation.

    Directory of Open Access Journals (Sweden)

    Alois Riegl

    2010-12-01

    Full Text Available Alois Riegl, The Origins of Baroque Art in Rome, edited and translated by Andrew Hopkins and Arnold Witte, with essays by Alina Payne, Arnold Witte, and Andrew Hopkins; Los Angeles: Getty Research Institute including contents, acknowledgments and a note on the translation.

  8. Cylindric partitions, W_r characters and the Andrews-Gordon-Bressoud identities

    CERN Document Server

    Foda, O

    2015-01-01

    We study the Andrews-Gordon-Bressoud (AGB) generalisations of the Rogers-Ramanujan q-series identities in the context of cylindric partitions. We recall the definition of r-cylindric partitions, and provide a simple proof of Borodin's product expression for their generating functions, that can be regarded as a limiting case of an unpublished proof by Krattenthaler. We also recall the relationships between the r-cylindric partition generating functions, the principal characters of affine sl_r algebras, the M^{r, r+d}_r minimal model characters of W_r algebras, and the r-string abaci generating functions, as well as the relationships between them, providing simple proofs for each. We then set r=2, and use 2-cylindric partitions to re-derive the AGB identities as follows. Firstly, we use Borodin's product expression for the generating functions of the 2-cylindric partitions with infinitely-long parts, to obtain the product sides of the AGB identities, times a factor (q; q)_{\\infty}^{-1}, which is the generating ...

  9. William Horner Andrews (1887–1953 – First Professor of Physiology at Onderstepoort

    Directory of Open Access Journals (Sweden)

    D. W. Verwoerd

    2011-04-01

    Full Text Available WHAndrews qualified as a veterinarian in London in 1908 and was recruited soon after, in 1909, by Sir Arnold Theiler to join the staff of the newly established veterinary laboratory at Onderstepoort. After initial studies on the treatment of trypanosomosis and on snake venoms he was deployed by Theiler in 1911 to start research on lamsiekte (botulismat a field station on the farm Kaffraria near Christiana, where he met and married his wife Doris. After a stint as Captain in the SA Veterinary Corps during World War I he succeeded D T Mitchell as head of the Allerton Laboratory in 1918, where he excelled in research on toxic plants, inter alia identifying Matricaria nigellaefolia as the cause of staggers in cattle.Whenthe Faculty ofVeterinary Science was established in 1920 he was appointed as the first Professor of Physiology. After the graduation of the first class in 1924, and due to health problems, he returned to the UK, first to the Royal Veterinary College and then to the Weybridge Veterinary Laboratories of which he became Director in 1927.After his retirement in 1947 he returned to South Africa as a guest worker at Onderstepoort where he again became involved in teaching physiologywhenProf. Quin unexpectedly died in 1950. Andrews died in Pretoria in 1953 and was buried in the Rebecca Street Cemetery.

  10. Occurrence of Cucumber mosaic virus on vanilla (Vanilla planifolia Andrews) in India

    Indian Academy of Sciences (India)

    R Madhubala; V Bhadramurthy; A I Bhat; P S Hareesh; S T Retheesh; R S Bhai

    2005-06-01

    Cucumber mosaic virus (CMV) causing mosaic, leaf distortion and stunting of vanilla (Vanilla planifolia Andrews) in India was characterized on the basis of biological and coat protein (CP) nucleotide sequence properties. In mechanical inoculation tests, the virus was found to infect members of Chenopodiaceae, Cucurbitaceae, Fabaceae and Solanaceae. Nicotiana benthamiana was found to be a suitable host for the propagation of CMV. The virus was purified from inoculated N. benthamiana plants and negatively stained purified preparations contained isometric particles of about 28 nm in diameter. The molecular weight of the viral coat protein subunits was found to be 25.0 kDa. Polyclonal antiserum was produced in New Zealand white rabbit, immunoglobulin G (IgG) was purified and conjugated with alkaline phosphatase enzyme. Double antibody sandwich-enzyme linked immunosorbent assay (DAS-ELISA) method was standardized for the detection of CMV infection in vanilla plants. CP gene of the virus was amplified using reverse transcriptase-polymerase chain reaction (RT-PCR), cloned and sequenced. Sequenced region contained a single open reading frame of 657 nucleotides potentially coding for 218 amino acids. Sequence analyses with other CMV isolates revealed the greatest identity with black pepper isolate of CMV (99%) and the phylogram clearly showed that CMV infecting vanilla belongs to subgroup IB. This is the first report of occurrence of CMV on V. planifolia from India.

  11. Electronic theses at the University of St Andrews: institutional infrastructure, policy and support to establish an electronic theses service

    OpenAIRE

    Aucock, Janet

    2008-01-01

    Electronic deposit of PhD theses produced by postgraduate research students in St Andrews was introduced in academic session 2006/7 and mandated as part of University regulations for the delivery and deposit of theses within the institution. The move to the new service was primarily driven by University Library planning and policy which clearly identified the need for improved service provision to the local, national and international research community by making the ...

  12. National Status and Trends: Bioeffects Program - Magnitude and Extent of Sediment Toxicity in Four Bays of the Florida Panhandle: Pensacola, Choctawhatchee, St. Andrew and Apalachicola

    Data.gov (United States)

    National Oceanic and Atmospheric Administration, Department of Commerce — The toxicity of sediments in Pensacola, Choctawhatchee, St. Andrew and Apalachicola Bays was determined as part of bioeffects assessments performed by NOAA's...

  13. Implications of Two Well-Known Models for Instructional Designers in Distance Education: Dick-Carey versus Morrison-Ross-Kemp

    Science.gov (United States)

    Akbulut, Yavuz

    2007-01-01

    This paper first summarizes, and then compares and contrasts two well-known instructional design models: Dick and Carey Model (DC) and Morrison, Ross and Kemp model (MRK). The target audiences of both models are basically instructional designers. Both models have applications for different instructional design settings. They both see the…

  14. Glass Cathedral: Gay Novel or Liberation Theology? An Interview with Andrew Koh

    Directory of Open Access Journals (Sweden)

    Angus Whitehead

    2013-05-01

    Full Text Available Singaporean Andrew Koh was a founding member of the groundbreaking Necessary Stage theatre company in 1987. In Singapore he is best remembered as the author of Glass Cathedral (1995, Singapore's second gay novel[la], which won the 1994 Singapore Literature Prize Commendation Award and was subsequently shortlisted for the 1996 Commonwealth Writers Prize for the Best First Novel Regional Awards. A collection of poetry, Hybrid from the East, was published in the UK in 1997. A second novel awaits publication. After initially leaving Singapore for London in the mid-1990s he now lives in Sydney as a healthcare worker and qualified Chinese medicine practitioner. Sixteen years after its initial publication, Glass Cathedral the novel is finally receiving attention and reappraisal in the wake of its Glass Cathedral's republication by Epigram Books as a Singapore Classic, alongside works such as Goh Poh Seng's The Immolation, Robert Yeo's The Adventures of Holden Heng and Lloyd Fernando's Scorpion Orchid. The interview took place on 8 November 2011 at a restaurant on the site of Koh's alma mater St Joseph's Institution, Bras Basah Road, Singapore, just days after Koh returned to the city-state and gave a spirited reading from and talk about Glass Cathedral at the Singapore Writers Festival. In this interview Koh discusses his Catholic upbringing, and his employment as a policeman during Singapore's policy of entrapment of homosexual men during the 1990s. Koh goes on to discuss how he came to write Glass Cathedral, his leaving Singapore in response to the nation-state's repressive climate and unsympathetic response to queer writing. In the second half of the interview Koh discusses homophobia in Singapore, the Catholic Church, and elsewhere and its roots in misogyny. Koh also draws attention to other issues explored in Glass Cathedral: the marginalisation of minorities in a supposedly multicultural nation state and the impact of Singapore's secret history

  15. On remembering and forgetting our autobiographical pasts: retrograde amnesia and Andrew Mayes's contribution to neuropsychological method.

    Science.gov (United States)

    Kopelman, M D; Bright, P

    2012-11-01

    Andrew Mayes's contribution to the neuropsychology of memory has consisted in steadily teasing out the nature of the memory deficit in the amnesic syndrome. This has been done with careful attention to matters of method at all stages. This particularly applies to his investigations of forgetting rates in amnesia and to his studies of retrograde amnesia. Following a brief outline of his work, the main current theories of retrograde amnesia are considered: consolidation theory, episodic-to-semantic shift theory, and multiple trace theory. Findings across the main studies in Alzheimer dementia are reviewed to illustrate what appears to be consistently found, and what is much more inconsistent. A number of problems and issues in current theories are then highlighted--including the nature of the temporal gradient, correlations with the extent of temporal lobe damage, what we would expect 'normal' remote memory curves to look like, how they would appear in focal retrograde amnesia, and whether we can pinpoint retrograde amnesia to hippocampal/medial temporal damage on the basis of existing studies. A recent study of retrograde amnesia is re-analysed to demonstrate temporal gradients on recollected episodic memories in hippocampal/medial temporal patients. It is concluded that there are two requirements for better understanding of the nature of retrograde amnesia: (i) a tighter, Mayesian attention to method in terms of both the neuropsychology and neuroimaging in investigations of retrograde amnesia; and (ii) acknowledging that there may be multiple factors underlying a temporal gradient, and that episodic and semantic memory show important interdependencies at both encoding and retrieval. Such factors may be critical to understanding what is remembered and what is forgotten from our autobiographical pasts.

  16. ANDREW LANG, COMPARATIVE ANTHROPOLOGY AND THE CLASSICS IN THE AFRICAN ROMANCES OF RIDER HAGGARD

    Directory of Open Access Journals (Sweden)

    J.L. Hilton

    2012-03-01

    Full Text Available The long-standing friendship between Andrew Lang (1844-19121 and Henry RiderHaggard (1856-19252 is surely one of the most intriguing literary relationships ofthe Victorian era.3 Lang was a pre-eminent literary critic and his support forHaggard’s earliest popular romances, such as King Solomon’s mines (1885 andShe (1887, helped to establish them as leading models of the new genre ofimperial adventure fiction.4 Lang and Haggard co-authored The world’s desire(18905 and the ideas of Lang, who was also a brilliant Classics scholar, can beseen in many of Haggard’s works. There are some significant similarities betweenthe two men: both were approximate contemporaries who lived through the mostaggressive phase of British imperialism, both were highly successfully writers whoearned their living by their pens, both wrote prolifically and fluently on a wide range of subjects,6 both were largely self-educated, both were interested in thesupernatural, both had had unhappy experiences in love at first but later maintainedlong-lasting marriages, and both were men with powerful faculties of imagination.There are, of course, significant differences also: Lang was a gifted intellectualwho had won a fellowship at Oxford, a Homeric scholar, a poet with a gift forirony and humour, and one of the earliest exponents of the new science ofanthropological mythology; Haggard was less well educated and more seriousminded,he preferred action to ideas, was personally involved in the extension ofBritish rule in Southern Africa,7 and had a close experience of African tribal life.This article sets out to investigate the relationship between these two men, and toassess the extent to which Lang’s classical and anthropological thinking shaped thenarratives of Haggard, especially those set in his imperialistic fantasy of theAfrican continent.

  17. Low-Frequency Response Following the Passage of Hurricane Andrew on the Texas-Louisiana Shelf

    Science.gov (United States)

    Pearce, S. M.; Smith, D. C.; Dimarco, S. F.

    2009-12-01

    During August 24th through 27th in 1992, Hurricane Andrew passed through the Gulf Of Mexico almost directly over several moorings on the easternmost Louisiana shelf portion of the Texas-Louisiana Shelf (LATEX) coastal ocean monitoring program. Examination of the current meter time-series showed the existence of fast moving, long shelf waves over the entire Texas-Louisiana shelf west of the storm passage for up to 12 days after direct forcing ceased. The LATEX program featured 31 moorings each with 3 current meters over the 10, 20, 50, and 200 meter isobaths in 5 cross sectional lines with additional coverage on the 200 meter isobath from the Louisiana-Mississippi River delta, to Corpus Christi, Texas. Additionally, several pressure records from LATEX and several NOAA historical coastal tide gauge data from Sabine Pass to Port Isabella, Texas were incorporated. Raw, 3-hour low pass filtered, and 40-hour low pass filtered versions of the current data were analyzed. The pressure data used were detided using a least squares fit, and the tidal records were detided using the NOAA predicted tides for that location. All data were analyzed using a wavelet analysis to determine the spectra over time. The analyzed data shows that the shelf response was largely dominated in the internal Kelvin wave mode. The wave propagated towards the west on the shelf at approximately 400 km/day. These results are contrasted and compared with wave modes predicted for coastal trapped wave solutions. The output of a coastal ocean model simulation using a forced wind field similar to the storm are also contrasted and compared with the observed data.

  18. TRAVERSABLE WORMHOLES IN BRANS-DICKE AND f(R) GRAVITATIONAL THEORIES%Brans-Dicke理论和f(R)理论中的可穿越虫洞

    Institute of Scientific and Technical Information of China (English)

    吕璐峰; 刘文彪

    2012-01-01

    Brans-Dicke理论和f(R)理论均为不同于Einstein广义相对论的修正引力理论,并且在Brans-Dicke理论参数ω=0时能够回到f(R)理论.人们在Brans-Dicke理论框架下研究得出只有-3/2〈ω〈-4/3才存在可穿越虫洞,ω=0时没有;然而,f(R)理论中已经证明确实也存在可穿越虫洞.为了解决上述所谓的矛盾,有文献修改了Brans-Dicke理论中的某些函数,从而改变ω的取值范围.仔细分析发现,文献中探讨的是对应不同Φ(r),b(r)的可穿越虫洞,自然会给出不一致的结论.本文对2种修正引力理论中的可穿越虫洞问题进行了澄清,明确了各自虫洞解的讨论前提条件.%Brans-Dicke theory and f(R) theory are two types of modified gravitational theories.Brans-Dicke theory under ω=0 is consistent with f(R) theory.Due to the traversable wormhole solution,Brans-Dicke theory under ω=0 should also be consistent with f(R) theory.However,the traversable wormhole solution in Brans-Dicke theory is limited under-3/2〈ω〈-4/3,excluding ω=0.Meanwhile,a traversable wormhole solution is given in f(R) theory.The C(ω) function in Brans-Dicke wormhole solution has been modified to extend the range of ω to 0.In fact,the traversable wormholes in Brans-Dicke theory and f(R) theory correspond to different functions of Φ(r) and b(r).It is not necessary to modify the range of ω in Brans-Dicke solutions.

  19. 基于Dick&Carey模型的专门用途英语教学设计研究%A Research on ESP Teaching Design Based on Dick & Carey Model

    Institute of Scientific and Technical Information of China (English)

    赵星驰

    2016-01-01

    专门用途英语,是根据学习者的特定目的和特定需求而开设的英语课程.本文以Walter Dick& Lou Carey教授提出的教学系统开发模型为依据,对学前教育专业《英语口语》课程进行教学课程设计,探索ESP教学模式在高职英语教学中的应用方法,解决高职院校英语教学难题,实现英语教学与岗位需求的无缝对接.

  20. Existence of naked singularities in the Brans-Dicke theory of gravitation. An analytical and numerical study

    Energy Technology Data Exchange (ETDEWEB)

    Bedjaoui, Nabil [LMFA and INSSET, Universite de Picardie Jules Verne, 48 rue Raspail, 02100 St Quentin (France); LeFloch, Philippe G [Laboratoire Jacques-Louis Lions and Centre National de la Recherche Scientifique, Universite Pierre et Marie Curie (Paris 6), 4 Place Jussieu, 75252 Paris (France); Martin-Garcia, Jose M [Institut d' Astrophysique de Paris and Centre National de la Recherche Scientifique, Universite Pierre et Marie Curie, 98bis Boulevard Arago, 75014 Paris (France); Novak, Jerome, E-mail: Bedjaoui@u-picardie.f, E-mail: pgLeFloch@gmail.co, E-mail: Garcia@iap.f, E-mail: Jerome.Novak@obspm.f [Laboratoire Univers et Theories, Observatoire de Paris and Centre National de la Recherche Scientifique, Universite Paris Diderot, 5 Place Jules Janssen, 92190 Meudon (France)

    2010-12-21

    Within the framework of the scalar-tensor models of gravitation and by relying on analytical and numerical techniques, we establish the existence of a class of spherically symmetric spacetimes containing a naked singularity. Our result relies on and extends a work by Christodoulou on the existence of naked singularities for the Einstein-scalar field equations. We establish that a key parameter in Christodoulou's construction couples to the Brans-Dicke field and becomes a dynamical variable, which enlarges and modifies the phase space of solutions. We recover analytically many properties first identified by Christodoulou, in particular the loss of regularity (especially at the center), and then investigate numerically the properties of these spacetimes.

  1. Fano-Agarwal couplings and non-rotating wave approximation in single-photon timed Dicke subradiance

    Science.gov (United States)

    Mirza, Imran M.; Begzjav, Tuguldur

    2016-04-01

    Recently a new class of single-photon timed Dicke (TD) subradiant states has been introduced with possible applications in single-photon-based quantum information storage and on demand ultrafast retrieval (Scully M. O., Phys. Rev. Lett., 115 (2015) 243602). However, the influence of any kind of virtual processes on the decay of these new kind of subradiant states has been left as an open question. In the present paper, we focus on this problem in detail. In particular, we investigate how pure Fano-Agarwal couplings and other virtual processes arising from non-rotating wave approximation impact the decay of otherwise sub- and superradiant states. In addition to the overall virtual couplings among all TD states, we also focus on the dominant role played by the couplings between specific TD states.

  2. Solving the Flatness and Quasi-flatness Problems in Brans-Dicke Cosmologies with a Varying Light Speed

    CERN Document Server

    Barrow, John D; Barrow, John D.; Magueijo, Joao

    1999-01-01

    We define the flatness and quasi-flatness problems in cosmological models. We seek solutions to both problems in homogeneous and isotropic Brans-Dicke cosmologies with varying speed of light. We formulate this theory and find perturbative, non-perturbative, and asymptotic solutions using both numerical and analytical methods. For a particular range of variations of the speed of light the flatness problem can be solved. Under other conditions there exists a late-time attractor with a constant value of Ømega that is smaller than, but of order, unity. Thus these theories may solve the quasi-flatness problem, a considerably more challenging problem than the flatness problem. We also discuss the related \\Lambda and quasi-\\Lambda problem in these theories. We conclude with an appraisal of the difficulties these theories may face.

  3. Characterization of the quantum phase transition in a two-mode Dicke model for different cooperation numbers

    Science.gov (United States)

    Quezada, L. F.; Nahmad-Achar, E.

    2017-01-01

    We show how the use of variational states to approximate the ground state of a system can be employed to study a multimode Dicke model. One of the main contributions of this work is the introduction of a not very commonly used quantity, the cooperation number, and the study of its influence on the behavior of the system, paying particular attention to the quantum phase transitions and the accuracy of the used approximations. We also show how these phase transitions affect the dependence of the expectation values of some of the observables relevant to the system and the entropy of entanglement with respect to the energy difference between atomic states and the coupling strength between matter and radiation, thus characterizing the transitions in different ways.

  4. A Study of Cosmic Expansion Generated by Non-conservation of Matter in the Framework of Brans-Dicke Theory

    CERN Document Server

    Roy, Sudipto

    2016-01-01

    The present study, on the expansion of universe, is based on an assumption regarding the possibility of inter-conversion between matter and dark energy, through some interaction of matter with the scalar field in the framework of Brans-Dicke theory. The field equations for a spatially flat space-time have been solved using an empirical dependence of scalar field parameter upon the scale factor. To represent the behaviour regarding the non-conservation of matter, a function, expressed in terms of the Hubble parameter, has been empirically incorporated into the field equations. Their solution shows that, this function, whose value is proportional to the matter content of the universe, decreases monotonically with time. This matter-field interaction generates late time acceleration, causing the deceleration parameter to change its sign from positive to negative. Time dependence of the proportion of dark energy component of the universe has been determined and shown graphically. Time variation of gravitational co...

  5. Higgs potential from extended Brans-Dicke theory and the time-evolution of the fundamental constants

    CERN Document Server

    Sola, Joan; Khodam-Mohammadi, A

    2016-01-01

    Despite the enormous significance of the Higgs potential in the context of the Standard Model of electroweak interactions and in Grand Unified Theories, its ultimate origin is fundamentally unknown and must be introduced by hand in accordance with the underlying gauge symmetry and the requirement of renormalizability. Here we propose a more physical motivation for the structure of the Higgs potential, which we link to gravity, and more specifically to an extended Brans-Dicke (BD) theory containing two interacting scalar fields. One of these fields is coupled to curvature as in the BD formulation, whereas the other is coupled to gravity both derivatively and non-derivatively through the curvature scalar and the Ricci tensor. By requiring that the cosmological solutions of the model are consistent with observations, we show that the effective scalar field potential adopts the Higgs potential form with a mildly time-evolving vacuum expectation value. Such residual vacuum dynamics could be responsible for the pos...

  6. Time Variation of the Matter Content of the Expanding Universe in the Framework of Brans-Dicke Theory

    CERN Document Server

    Roy, Sudipto

    2016-01-01

    In the framework of Brans-Dicke theory, a cosmological model regarding the expanding universe has been formulated by considering an inter-conversion of matter and dark energy. A function of time has been incorporated into the expression of the density of matter to account for the non-conservation of the matter content of the universe. This function is proportional to the matter content of the universe. Its functional form is determined by using empirical expressions of the scale factor and the scalar field in field equations. This scale factor has been chosen to generate a signature flip of the deceleration parameter with time. The matter content is found to decrease with time monotonically, indicating a conversion of matter into dark energy. This study leads us to the expressions of the proportions of matter and dark energy of the universe. Dependence of various cosmological parameters upon the matter content has been explored.

  7. The effect of potassium and mycorrhiza on growth of vanilla (Vanilla planifolia Andrew

    Directory of Open Access Journals (Sweden)

    I GEDE TIRTA

    2006-04-01

    Full Text Available The few and shallow roots caused slow growth of vanilla seedling. Mycorrhiza may increased the absorption of water and nutrients, while potassium may increased the rate of growth and strength of seedlings. This study was conducted at Sambangan Village, Buleleng, Bali in 2003 (April-Agustus 2003. The experiment was done in polybag and was arranged in Randomized Block Design with three replications. The treatments were consisted of two factors. The first factor was the rates of KCl fertilizer ( 0, 100 and 200 kg ha-1 or 0, 0,10 and 0,20 9 plant-1 and the second factor was the rates of mycorrhiza (0, 20 and 30 g plant-1. The aim of the research to study interactions between potassium and mycorrhiza and The optimum dosage the mycorrhiza on growth of vanilla (Vanilla planifolia Andrew. The resultes showed that there were interactions between potassium and mycorrhiza on fresh weight of the new shoot, root length and fresh root weight. The optimum dosage of the mycorrhiza was 20 g plant-1 with new shoot fresh weight was 25.63 g plant-1. The longest root (24.67 cm plant-1 was observed at the treatment without potasium with 20 g plant-1 mycorrhiza and this was 23% longer than control (19.93 cm plant-1. The highest fresh root weight (2.48 g plant-1 was observed at the dosage of 200 kg KCl ha-1 and 20 g mycorrhiza plant-1 and that was 55% heavier than control (1.60 g plant-1. The leaf number of the plant with 20 g plant-1 mycorrhiza was 6.22 and that was 18% more than control with leaf number 5.25. The total fresh weight of the seedling with 20 g plant-1 mycorrhiza was 86.74 g plant-1or 15% higher compared with control (75.18 g plant-1. The dosage of 100 kg KCl ha-1 increased the K content of the plant (2.45%K or 35% higher than control (1.81%K.

  8. Effect of Hurricane Andrew on the Turkey Point Nuclear Generating Station from August 20--30, 1992. [Final report

    Energy Technology Data Exchange (ETDEWEB)

    Hebdon, F.J. [Institute of Nuclear Power Operations, Atlanta, GA (United States)

    1993-03-01

    On August 24, 1992, Hurricane Andrew, a Category 4 hurricane, struck the Turkey Point Electrical Generating Station with sustained winds of 145 mph (233 km/h). This is the report of the team that the US Nuclear Regulatory Commission (NRC) and the Institute of Nuclear Power Operations (INPO) jointly sponsored (1) to review the damage that the hurricane caused the nuclear units and the utility`s actions to prepare for the storm and recover from it, and (2) to compile lessons that might benefit other nuclear reactor facilities.

  9. A tale of two storms: Surges and sediment deposition from Hurricanes Andrew and Wilma in Florida’s southwest coast mangrove forests: Chapter 6G in Science and the storms-the USGS response to the hurricanes of 2005

    Science.gov (United States)

    Smith, Thomas J.; Anderson, Gordon H.; Tiling, Ginger

    2007-01-01

    Hurricanes can be very different from each other. Here we examine the impacts that two hurricanes, Andrew and Wilma, had in terms of storm surge and sediment deposition on the southwest coast of Florida. Although Wilma was the weaker storm, it had the greater impact. Wilma had the higher storm surge over a larger area and deposited more sediment than did Andrew. This effect was most likely due to the size of Wilma's eye, which was four times larger than that of Andrew.

  10. Mangroves, hurricanes, and lightning strikes: Assessment of Hurricane Andrew suggests an interaction across two differing scales of disturbance

    Science.gov (United States)

    Smith, Thomas J.; Robblee, Michael B.; Wanless, Harold R.; Doyle, Thomas W.

    1994-01-01

    The track of Hurricane Andrew carried it across one of the most extensive mangrove for ests in the New World. Although it is well known that hurricanes affect mangrove forests, surprisingly little quantitative information exists concerning hurricane impact on forest structure, succession, species composition, and dynamics of mangrove-dependent fauna or on rates of eco-system recovery (see Craighead and Gilbert 1962, Roth 1992, Smith 1992, Smith and Duke 1987, Stoddart 1969).After Hurricane Andrew's passage across south Florida, we assessed the environmental damage to the natural resources of the Everglades and Biscayne National Parks. Quantitative data collected during subsequent field trips (October 1992 to July 1993) are also provided. We present measurements of initial tree mortality by species and size class, estimates of delayed (or continuing) tree mortality, and observations of geomorphological changes along the coast and in the forests that could influence the course of forest recovery. We discuss a potential interaction across two differing scales of disturbance within mangrove forest systems: hurricanes and lightning strikes.

  11. Patterns and drivers of Holocene vegetational change near the prairie-forest ecotone in Minnesota: revisiting McAndrews' transect.

    Science.gov (United States)

    Nelson, David M; Hu, Feng Sheng

    2008-07-01

    Holocene vegetational dynamics along the prairie-forest border of Minnesota were first documented in McAndrews' classic work. Despite numerous subsequent paleo-studies, a number of questions remain unanswered about the vegetation history of the region. Here, pollen, stable-isotope, mineral, and charcoal data are described from three lakes near McAndrews' sites. These data were compared with other paleoenvironmental records to reconstruct vegetation, aridity, and fire. The climate was relatively wet with increasing summer temperatures before approximately 8000 yr before present (BP). The rates of changes were asymmetric for the onset and termination of middle-Holocene aridity, with an abrupt increase at approximately 8000 yr BP and a gradual, but variable, decline from approximately 7800 to 4000 yr BP. Early-Holocene coniferous forests changed to mixed-grass prairie without an intervening period of tallgrass prairie or deciduous forest, whereas the retreat of prairie was characterized by transitions from mixed-grass to tallgrass prairie to deciduous forest and finally to coniferous forest. Within the middle Holocene, the composition and structures of grass-dominated vegetation varied both temporally and spatially. Fire primarily responded to changes in climate and fuel loads. Vegetation was more strongly influenced by climatic changes than by fire-regime shifts.

  12. Influence of counter-rotating interaction on quantum phase transition in Dicke-Hubbard lattice: an extended coherent-state approach

    Science.gov (United States)

    Lu, Yongchuan; Wang, Chen

    2016-10-01

    We investigate the ground-state behavior of the Dicke-Hubbard model including counter-rotating terms. By generalizing an extended coherent-state approach within mean-field theory, we self-consistently obtain the ground-state energy and delocalized order parameter. Localization-delocalization quantum phase transition of photons is clearly observed by breaking the parity symmetry. Particularly, Mott lobes are fully suppressed, and the delocalized order parameter shows monotonic enhancement by increasing qubit-cavity coupling strength, in sharp contrast to the Dicke-Hubbard model under rotating-wave approximation. Moreover, the corresponding phase boundaries are stabilized by decreasing photon hopping strength, compared to the Rabi-Hubbard model.

  13. Dicke-Narrowing Spectroscopy of Doubly Dressed Electromagnetically Induced Transparency and Singly Dressed Four-Wave-Mixing in a Confined Atomic System

    Institute of Scientific and Technical Information of China (English)

    LI Yuan-Yuan; BAI Jin-Wao; LI-Li; ZHANG Wei-Feng; LI Chang-Biao; NIE Zhi-Qiang; GAN Chen-Li; ZHANG Yan-Peng

    2008-01-01

    Dicke-narrowing effect appears both in doubly dressed electromagnetically induced transparency and singly dressed four-wave-mixing lines due to the contribution of slow atoms resulting from de-excited effects of atom-wall collision and transient behaviour of atoms in a confined system. A robust recipe for high resolution spectroscopy of electromagnetically induced transparency dressed by two fields and four-wave-mixing lines comparable with the cold atoms is achievable in a thin vapour cell in experiments.

  14. A dark energy model with higher derivatives of H in the framework of Chameleon Brans-Dicke Cosmology

    CERN Document Server

    Pasqua, Antonio

    2016-01-01

    In this paper, we study some relevant cosmological features of a Dark Energy (DE) model which is function of the Hubble parameter $H$ and its first and second time derivatives in the framework of Chameleon Brans-Dicke (BD) Cosmology. Choosing a particular ansatz for some of the quantities involved, we derive the expressions of some important cosmological quantities, like the Equation of State (EoS) parameter of DE $w_D$, the effective EoS parameter $w_{eff}$, the pressure of DE $p_D$ and the deceleration parameter $q$. Moreover, we study the behavior of statefinder parameters $r$ and $s$, of the cosmographic parameters $j$, $s_{cosmo}$, $l$ and $m$ and of the squared speed of the sound $v_s^2$ for both case corresponding to non interacting and interacting Dark Sectors. We also plot the quantities we have derived and we calculate their values for $t\\rightarrow 0$ (i.e. for the beginning of the Universe history), for $t\\rightarrow \\infty$ (i.e. for far future) and for the present time, indicated with $t_0$.

  15. Higgs potential from extended Brans–Dicke theory and the time-evolution of the fundamental constants

    Science.gov (United States)

    Solà, Joan; Karimkhani, Elahe; Khodam-Mohammadi, A.

    2017-01-01

    Despite the enormous significance of the Higgs potential in the context of the standard model of electroweak interactions and in grand unified theories, its ultimate origin is fundamentally unknown and must be introduced by hand in accordance with the underlying gauge symmetry and the requirement of renormalizability. Here we propose a more physical motivation for the structure of the Higgs potential, which we derive from a generalized Brans–Dicke (BD) theory containing two interacting scalar fields. One of these fields is coupled to curvature as in the BD formulation, whereas the other is coupled to gravity both derivatively and non-derivatively through the curvature scalar and the Ricci tensor. By requiring that the cosmological solutions of the model are consistent with observations, we show that the effective scalar field potential adopts the Higgs potential form with a mildly time-evolving vacuum expectation value. This residual vacuum dynamics could be responsible for the possible time variation of the fundamental constants, and is reminiscent of former Bjorken’s ideas on the cosmological constant problem.

  16. Alavi, Hamid R., Aira Htenas, Ron Kopicki, Andrew W. Sheperd and Ramon Clarete (eds (2012, Trusting Trade and the Private Sector for Food Security in Southeast Asia

    Directory of Open Access Journals (Sweden)

    Chung Ming CHIN

    2014-01-01

    Full Text Available Book Review of the edited compilation: Alavi, Hamid R., Aira Htenas, Ron Kopicki, Andrew W. Sheperd and Ramon Clarete (eds (2012, Trusting Trade and the Private Sector for Food Security in Southeast Asia, Washington DC: The World Bank, ISBN: 978-0-8213-8626-2, 264 pages

  17. 33 CFR 334.770 - Gulf of Mexico and St. Andrew Sound, south of East Bay, Fla., Tyndall Drone Launch Corridor...

    Science.gov (United States)

    2010-07-01

    ... Sound, south of East Bay, Fla., Tyndall Drone Launch Corridor, Tyndall Air Force Base, Fla.; restricted.... Andrew Sound, south of East Bay, Fla., Tyndall Drone Launch Corridor, Tyndall Air Force Base, Fla... referred to as the “Tyndall Drone Launch Corridor.” (b) The regulations. (1) Military usage of areas...

  18. 33 CFR 334.680 - Gulf of Mexico, southeast of St. Andrew Bay East Entrance, small-arms firing range, Tyndall Air...

    Science.gov (United States)

    2010-07-01

    ... 33 Navigation and Navigable Waters 3 2010-07-01 2010-07-01 false Gulf of Mexico, southeast of St. Andrew Bay East Entrance, small-arms firing range, Tyndall Air Force Base, Fla. 334.680 Section 334.680 Navigation and Navigable Waters CORPS OF ENGINEERS, DEPARTMENT OF THE ARMY, DEPARTMENT OF DEFENSE DANGER ZONE AND RESTRICTED AREA REGULATIONS...

  19. Lágrimas nas profundezas: alegorias utópicas em Moby Dick e o nominalismo na obra de William de Ockham

    Directory of Open Access Journals (Sweden)

    Estevan de Negreiros Ketzer

    2012-12-01

    Full Text Available A obra de Herman Melville, Moby Dick, é constituída como uma utopia dentro das circunstâncias condensadas nas personagens da Baleia e do capitão Ahab. A psicanálise, em sua compreensão semântica, cuja implicação envolve o sujeito psíquico, potencializa as singularidades e o coloca ao desafio que extrapola o tempo lógico quando há um encontro na criação utópica. O nominalismo do filósofo inglês Ockham problematiza a dinâmica do conhecimento ao formular um método que corta as explicações excessivas (a navalha e indaga qual o caminho da apropriação humana no que diz respeito ao campo da discernibilidade dos saberes, trilha esta buscada na obra de Melville.Cries in the deepness: utopical allegories in Moby Dick and the nominalism in the William of Ockham's work. The Herman Melville's work, Moby Dick, is a constituted utopia inside condensed circumstances in the whale and in captain Ahab figures. The psychoanalysis in its semantic understanding, in which implication involves the psychological subject, potentiates the singularity and puts it to a challenge that oversteps the logic time when there is a meeting on the utopian creation. The nominalism from the Brittan philosophy Ockham problematizes the knowledge dynamic to formulate a method that cuts the excessive explanations (the razor and inquires what the pathway to the human ownership making sense of discern field of knowledge, this trail is being searched in the Melville's work.

  20. Apocalyptic Kingship, Harmony and Political Expediency: the Challenges and Paradoxes of Andrew Marvell’s “First Anniversary”

    Directory of Open Access Journals (Sweden)

    Jajtner Tomáš

    2015-07-01

    Full Text Available The following paper deals with the interpretation of one of the major “Cromwellian” poems of Andrew Marvell (1621-1678, “The First Anniversary of the Government under His Highness the Lord Protector”, 1655. The poem is first set in the context of Marvell’s poetry and his public career in the period between 1637 and 1660. The article then identifies and analyses three main themes of “The First Anniversary”: the notion of a new aeon starting with Cromwell’s rule and the apocalyptical imagery related to his Protectorate, the concept of his power and authority between liberty and tyranny, and the relation between the harmony established by Cromwell and classical Pythagorean harmonious lore. The author argues that the imagery Marvell uses to describe the nature of the regime (especially the concept of Cromwell’s “no-kingship” shows a deeply paradoxical structure, which uncovers the frailty and insecurity of Cromwell’s dictatorship as well as the circular logic of its justification. In that sense, the poem can be read as a vivid manifestation of the dilemmas and tensions of this period.

  1. Congruences for Andrews' spt-function modulo 32760 and extension of Atkin's Hecke-type partition congruences

    CERN Document Server

    Garvan, F G

    2010-01-01

    New congruences are found for Andrews' smallest parts partition function spt(n). The generating function for spt(n) is related to the holomorphic part alpha(24z) of a certain weak Maass form M(z) of weight 3/2. We show that a normalized form of the generating function for spt(n) is an eigenform modulo 72 for the Hecke operators T(p^2) for primes p > 3, and an eigenform modulo t for t = 5, 7 or 13 provided that (t, 6p) = 1. The result for the modulus 3 was observed earlier by the author and considered by Ono and Folsom. Similar congruences for higher powers of t (namely 5^6, 7^4 and 13^2) occur for the coefficients of the function alpha(z). Analogous results for the partition function were found by Atkin in 1966. Our results depend on the recent result of Ono that M[p](z/24) is a weakly holomorphic modular form of weight 3/2 for the full modular group where M[p](z) = M(z)|T(p^2) - chi(p)(1 + p)M(z).

  2. Measuring Change in Symptoms of Neurobehavioural Disability: Responsiveness of the St Andrew's-Swansea Neurobehavioural Outcome Scale.

    Science.gov (United States)

    Alderman, Nick; Williams, Claire; Knight, Caroline; Wood, Rodger Ll

    2017-04-05

    Neurobehavioural disability (NBD) after acquired brain injury (ABI) is often associated with poor outcome. The "St Andrew's-Swansea Neurobehavioural Outcome Scale" (SASNOS) was developed to measure NBD in a range of applications. Two of the "holy trinity" of psychometric properties, reliability and validity, have been comprehensively mapped, but the extent to which SASNOS meets the third, responsiveness, has not been investigated. Demonstrating responsiveness is essential in instruments employed in repeated measurement scenarios to confirm their ability to discriminate real change from error. However, there is no single agreed method for determining responsiveness. For some instruments, this property remains unexplored. A difference in scores attaining statistical significance for aggregate data is frequently cited as support for this construct, but this approach remains heavily criticized. This study explores responsiveness of SASNOS. Consecutive SASNOS assessments completed over varying times for 145 individuals participating in neurobehavioural rehabilitation, drawn from multiple services, were compiled into a retrospective sample of convenience. Multiple methods were employed to confirm internal responsiveness, including those identifying statistically significant change, minimally detectable change and minimally important change. All methods confirmed responsiveness as a psychometric property of SASNOS; the extent depended on method used and NBD domain investigated. A number of indicators are presented, which equip clinicians and researchers with options to interpret results from repeated assessments, including the individual level in the context of rehabilitation. SASNOS reliably measures change over time in NBD symptoms, further confirming its suitability as an instrument for investigating multidimensional outcomes of ABI.

  3. The Impact of Structural Break(s on the Validity of Purchasing Power Parity in Turkey: Evidence from Zivot-Andrews and Lagrange Multiplier Unit Root Tests

    Directory of Open Access Journals (Sweden)

    Hakan Kum

    2012-01-01

    Full Text Available This study examines the validity of the purchasing power parity (PPP in Turkey for annual data from 1953 to 2009. While results from both the ADF unit root and the DF-GLS unit root test indicate mixed results, PPP holds for Turkey with the presence of structural breaks which are obtained by Zivot and Andrews and Lagrange Multiplier unit root tests.

  4. Model of a vanadium redox flow battery with an anion exchange membrane and a Larminie-correction

    Science.gov (United States)

    Wandschneider, F. T.; Finke, D.; Grosjean, S.; Fischer, P.; Pinkwart, K.; Tübke, J.; Nirschl, H.

    2014-12-01

    Membranes are an important part of vanadium redox flow battery cells. Most cell designs use Nafion®-type membranes which are cation exchange membranes. Anion exchange membranes are reported to improve cell performance. A model for a vanadium redox flow battery with an anion exchange membrane is developed. The model is then used to calculate terminal voltages for open circuit and charge-discharge conditions. The results are compared to measured data from a laboratory test cell with 40 cm2 active membrane area. For higher charge and discharge currents, an empirical correction for the terminal voltage is proposed. The model geometry comprises the porous electrodes and the connected pipes, allowing a study of the flow in the entrance region for different state-of-charges.

  5. Moby-Dick

    NARCIS (Netherlands)

    Melville, Herman

    2005-01-01

    On board the whaling ship Pequod a crew of wise men and fools, renegades and seeming phantoms is hurled through treacherous seas by a crazed captain hell-bent on hunting down the mythic White Whale. Melville transforms the little world of the whale-ship into a crucible where mankind's fears, faith a

  6. Dick Crane's California Days

    Science.gov (United States)

    Holbrow, Charles H.

    2011-03-01

    Horace Richard Crane (1907-2007) was born and educated in California. His childhood was full of activities that helped him become an outstanding experimental physicist. As a graduate student at the California Institute of Technology (1930-1934), he had the good fortune to work with Charles C. Lauritsen (1892-1968) just as he introduced accelerator-based nuclear physics to Caltech. They shared the euphoric excitement of opening up a new field with simple, ingenious apparatus and experiments. This work prepared Crane for his career at the University of Michigan (1935-1973) where in the 1950s, after making the first measurement of the electron's magnetic moment, he devised the g-2 technique and made the first measurement of the anomaly in the electron's magnetic moment. A man of direct, almost laconic style, he made lasting contributions to the exposition of physics to the general public and to its teaching in high schools, community colleges, four-year colleges, and universities. I tell how he became a physicist and describe some of his early achievements.

  7. 基于Dick-Carey教学设计模式的生物学微课开发与启示

    Institute of Scientific and Technical Information of China (English)

    王瑞; 章潞妮; 陈秉初

    2015-01-01

    微课作为一种新兴课程,主要“微”在授课时间和内容上。运用Dick-Carey教学设计模式开发设计生物学微课,如在实验部分多采用微课形式,在新授知识中穿插一些微课视频,在自主复习中配合微课的回顾和练习,等等。相信这些改变能为生物课堂教学带来更多惊喜。

  8. The Effects of Dose Rhizoctonia Binucleat (BNR and Phosphorus to Nitrate Reductase Activity (NRA and Chlorophyll of Vanilla Seedling (Vanilla planifolia Andrews

    Directory of Open Access Journals (Sweden)

    Haryuni Haryuni

    2016-09-01

    Full Text Available Vanilla (Vanilla planifolia Andrews is one of the important exported commodities in Indonesia. Indonesia is one of top five major vanilla exporters in the world, that produce the high quality of Indonesian vanilla with high vanillin content (2.75%. The aims of this research were to determine the effects of dose binukleat Rhizoctonia (BNR and phosphorus as well as the interaction of the nitrate reductase activity (NRA and chlorophyll of the vanilla seedling (Vanilla planifolia Andrew. Method in this research used completely randomized factorial design, by involving two factors (dose of BNR inoculation and Phosphor. The first factor is without inoculation and inoculation BNR (M0, M1, M2, M3 wich consists of (0,5, 10, 15 g/polybag, the second factor is the dose of phosphorus fertilizer (P0, P1, P2, P3 which consists of (0, 3, 6, 9 g/polibag. The results showed that the inoculation dose of BNR and doses of phosphorus not significant and lower levels of NRA and chlorophyll while the interaction dose of BNR and phosphorus significantly and increase levels of NRA and chlorophyll of vanilla seedling. Nitrate Reductase Activity and chlorophyll has important role in metabolism process as a plant growth indicator.How to CiteHaryuni, H., & Dewi, T. S. K. (2016. The Effects of Dose Rhizoctonia Binucleat (BNR and Phosphorus to Nitrate Reductase Activity (NRA and Chlorophyll of Vanilla Seedling (Vanilla planifolia Andrews. Biosaintifika: Journal of Biology & Biology Education, 8(2, 141-147.

  9. Victimization and Guilt as Two Sides of the Same Coin : Andrew ‘Ender’ Wiggin’s Duality in Ender’s Game

    OpenAIRE

    Hernández Ucero, Sandra

    2016-01-01

    Orson Scott Card’s novel Ender’s Game follows Andrew ‘Ender’ Wiggin’s journey to become the next hero of mankind that will defeat the seemingly imminent Formics’ Third Invasion, an enemy alien species. This dissertation aims at arguing that despite the claims that Ender is a victim in the hands of the officers who run the training programme, he also bears certain responsibility for the acts he commits during his stay in it. This would enable us to place Ender, not under one of the mutually ex...

  10. Andrews Android and Apple Ios Strengths&Weaknesses and Prospects%安卓Android与苹果ios优劣与发展前景

    Institute of Scientific and Technical Information of China (English)

    汪峙峰; 薛源

    2011-01-01

    This paper describes Google's Andrew system with Apple's IOS system, introduced the application of two systems,detailed evaluation of the differences between the system and the pros and cons,and look at future trends and prospects.%文章主要介绍了谷歌的安卓系统与苹果公司的IOS系统,介绍了2个系统的应用范围,详细评价了系统之间存在的差异及优劣,并展望在未来的发展趋势和前景。

  11. Victimization and Guilt as Two Sides of the Same Coin : Andrew ‘Ender’ Wiggin’s Duality in Ender’s Game

    OpenAIRE

    Hernández Ucero, Sandra

    2016-01-01

    Orson Scott Card’s novel Ender’s Game follows Andrew ‘Ender’ Wiggin’s journey to become the next hero of mankind that will defeat the seemingly imminent Formics’ Third Invasion, an enemy alien species. This dissertation aims at arguing that despite the claims that Ender is a victim in the hands of the officers who run the training programme, he also bears certain responsibility for the acts he commits during his stay in it. This would enable us to place Ender, not under one of the mutually ex...

  12. Nomina nova in Platyhelminthes pro Macrorhynchus von Graff, 1882 (non [Gmelin, 1801]; non Dunker, 1843), and Leptocleidus Mueller, 1936 (non Andrews, 1922).

    Science.gov (United States)

    Hornung, Jahn J

    2016-08-19

    Two genus-group names of flat-worms-Leptocleidus Mueller, 1936 and Macrorhynchus von Graff, 1882-are junior homonyms that are preoccupied by fossil diapsid reptile genera-Leptocleidus Andrews, 1922, and Macrorhynchus Dunker, 1843-and an extant teleost fish genus-Macrorhynchus [Gmelin, 1801] ex La Cépède, 1800. These are replaced by nomina nova (Pharyngodytes nom. nov.; Graffiellus nom. nov.). Macrorhynchus [Gmelin, 1801] is an objective senior synonym of Macrorhyncus Dumeríl, 1805 ex La Cépède, 1800 (syn. nov.), and a senior homonym of Macrorhynchus Dunker, 1843, and Macrorhynchus von Graff, 1882.

  13. Maaleht soovitab : Anu Tali dirigeerib Vanemuises "Toscat". Vivaldi, Casanova ja Veneetsia. "Uinuv kaunitar" Vanemuises. Andrew Lloyd Webberi juubelikontserdid. Pärimusmuusika lõiluspidu

    Index Scriptorium Estoniae

    2008-01-01

    27. sept. juhatab Anu Tali Vanemuise teatris Mikk Mikiveri lavastatud ja Ervin Õunapuu taastatud Puccini ooperilavastust "Tosca". Barokkansambel Corelli Consort ja Raivo Järvi esitavad kava "Vivaldi, Casanova ja Veneetsia" 15. okt. Maardu mõisa muusikasalongis, 18. okt. Pärnus sarjas "Café Grand muusikasalong" ja 19. okt. Eesti Teaduste Akadeemia majas sarjas "Toompea muusikasalong". Vanemuisees esietendub 4. okt. Pjotr Tshaikovski ballett "Uinuv kaunitar". Tallinnas Saku Suurhallis toimuvad 18. okt. briti muusikalihelilooja Andrew Lloyd Webberi 60. sünnipäevale pühendatud juubelikontserdid. Viljandi Pärimusmuusika Aidas peetakse 10.-11. okt. "Pärimusmuusika lõikuspidu"

  14. Maaleht soovitab : Anu Tali dirigeerib Vanemuises "Toscat". Vivaldi, Casanova ja Veneetsia. "Uinuv kaunitar" Vanemuises. Andrew Lloyd Webberi juubelikontserdid. Pärimusmuusika lõiluspidu

    Index Scriptorium Estoniae

    2008-01-01

    27. sept. juhatab Anu Tali Vanemuise teatris Mikk Mikiveri lavastatud ja Ervin Õunapuu taastatud Puccini ooperilavastust "Tosca". Barokkansambel Corelli Consort ja Raivo Järvi esitavad kava "Vivaldi, Casanova ja Veneetsia" 15. okt. Maardu mõisa muusikasalongis, 18. okt. Pärnus sarjas "Café Grand muusikasalong" ja 19. okt. Eesti Teaduste Akadeemia majas sarjas "Toompea muusikasalong". Vanemuisees esietendub 4. okt. Pjotr Tshaikovski ballett "Uinuv kaunitar". Tallinnas Saku Suurhallis toimuvad 18. okt. briti muusikalihelilooja Andrew Lloyd Webberi 60. sünnipäevale pühendatud juubelikontserdid. Viljandi Pärimusmuusika Aidas peetakse 10.-11. okt. "Pärimusmuusika lõikuspidu"

  15. Feeding behavior of hummingbirds and perching birds on Erythrina speciosa Andrews (Fabaceae) flowers in an urban area, Londrina, Paraná, Brazil Comportamento alimentar de beija-flores e Passeriformes nas flores de Erytrhina speciosa Andrews (Fabaceae) em uma área urbana de Londrina, Paraná, Brasil

    OpenAIRE

    Luciana Baza Mendonça; Luiz dos Anjos

    2006-01-01

    Nine species of birds - seven hummingbirds (Trochilidae) and two Passeriformes - were observed visiting the flowers of Erythrina speciosa Andrews (Fabaceae), a hummingbird-pollinated species present on the campus of Londrina State University, Paraná State, Brazil. Nectar in bagged flowers bore little relationship with nectar in flowers opened to foragers either regarding quantity or diurnal pattern of availability. Birds were more frequent early in the morning and their activity on flowers fu...

  16. On Dick's Tragedy in Tender Is the Night from the Psychological Facet of Focalization%从人物视角的心理层面看《夜色温柔》中迪克的悲剧成因

    Institute of Scientific and Technical Information of China (English)

    赵瑜

    2010-01-01

    Dick is tempted by the upper class and destroyed by it in Tender Is the Night. Dick's love is so deep and Dick's heart is so kind. He wants to save Nicole and recovers his health with his sincere love, he even wants to treat the ill state of the upper class with a healthy life style. He is so childish, he the psychological Facet and try to find the root of his tragedy.%中迪克,受到上流社会的诱惑,希望通过他善良和纯真的爱来挽救富家小姐妮可并帮助她恢复健康.他甚至幻想通过自己健康的生活方式来挽救整个堕落的上流社会,但最终却被其毁灭.本文将从小说主人公迪克的视角的心理层面,分析迪克悲剧的成因.

  17. L’adresse du lointain. La mémoire au travail chez Michaux, Burroughs, K. Dick, Chris Marker et Ricardo Piglia

    Directory of Open Access Journals (Sweden)

    Anne Bourse

    2009-07-01

    Full Text Available Cet article analyse quelques variations de la formule épistolaire de Michaux : « Je vous écris d’un pays lointain… » Le dépliement d’autres figures de voyageurs tels que Burroughs (The Yage Letters, Philip K. Dick (Ubik, Chris Marker (Sans Soleil, Le Dépays et Ricardo Piglia (Respiración artificial révèle que le « lointain » se loge parfois au plus intime (du corps propre, d’une grammaire familière et qu’il ne cesse de brouiller les frontières séparant habituellement les morts des vivants. Adressé depuis divers ailleurs, ce travail de la mémoire cherche autant à suturer qu’à creuser l’inquiétante disjointure des temps.In this article we will analyze a number of variations of Michaux’s epistolary formula: “I am writing to you from a faraway country…” By unfolding other travelers’ figures such as Burroughs’ (The Yage Letters, Philip K. Dick’s (Ubik, Chris Marker’s (Sunless, Le Dépays and Ricardo Piglia’s (Respiración artificial, we will examine how “remoteness” is sometimes lodged within the deepest intimacy (the body itself, a familiar grammar and we will take a closer look at the way it constantly blurs, moves and disquiets the lines existing between the living and the dead. Enunciated and sent out from different elsewheres, this work on memory seeks as much to stitch up as to deepen time’s unsettling spinning out of joint.Este artículo analiza algunas variaciones de la fórmula epistolar de Michaux : “Le escribo de un país lejano…”. La similitud con otros viajeros presentes en la obra de Burroughs (The Yage Letters, de Philip K. Dick (Ubik, de Chris Marker (Sans soleil, Le Dépays y de Ricardo Piglia (Respiración artificial revela que lo "lejano" habita a veces en lo más íntimo (del propio cuerpo, de una gramática familiar y que no deja de desdibujar las fronteras que habitualmente separan a los muertos de los vivos. Dirigido desde sitios muy diversos, este trabajo de

  18. Anti-trypanosomal activity of 1,2,3,4,6-penta-O-galloyl-? -D-glucose isolated from Plectranthus barbatus Andrews (Lamiaceae)

    Energy Technology Data Exchange (ETDEWEB)

    Santos, Roberta T. dos; Hiramoto, Liliane L.; Lago, Joao Henrique G.; Sartorelli, Patricia [Universidade Federal de Sao Paulo (UNIFESP), Diadema, SP (Brazil). Inst. de Ciencias Ambientais, Quimicas e Farmaceuticas; Tempone, Andre G.; Pinto, Erika G. [Instituto Adolfo Lutz, Sao Paulo, SP (Brazil). Dept. de Parasitologia; Lorenzi, Harri, E-mail: psartorelli@unifesp.br [Instituto Plantarum de Estudos da Flora, Nova Odessa, SP (Brazil)

    2012-07-01

    MeOH extract from the leaves of Plectranthus barbatus Andrews (Lamiaceae), showed in vitro anti-trypanosomal activity. The bioassay-guided fractionation resulted in the isolation of a gallic acid derivative, identified as 1,2,3,4,6-penta-O-galloyl-{beta}-D-glucose (PGG), after thorough NMR and MS spectral analysis. Finally, this compound was tested against trypomastigote forms of T. cruzi and displayed an EC{sub 50} value of 67 {mu}M, at least 6.6-fold more effective than the standard drug benznidazole. This is the first occurrence of PGG in the Plectranthus genus and the first anti-parasitic activity described for PGG in the literature (author)

  19. Book Review: Maxwell's Demon 2: Entropy, classical and quantum information, computing. Harvey Leff and Andrew Rex (Eds.); Institute of Physics, Bristol, 2003, 500pp., US 55, ISBN 0750307595

    Science.gov (United States)

    Shenker, Orly R.

    2004-09-01

    In 1867, James Clerk Maxwell proposed a perpetuum mobile of the second kind, that is, a counter example for the Second Law of thermodynamics, which came to be known as "Maxwell's Demon." Unlike any other perpetual motion machine, this one escaped attempts by the best scientists and philosophers to show that the Second Law or its statistical mechanical counterparts are universal after all. "Maxwell's demon lives on. After more than 130 years of uncertain life and at least two pronouncements of death, this fanciful character seems more vibrant than ever." These words of Harvey Leff and Andrew Rex (1990), which open their introduction to Maxwell's Demon 2: Entropy, Classical and Quantum Information, Computing (hereafter MD2) are very true: the Demon is as challenging and as intriguing as ever, and forces us to think and rethink about the foundations of thermodynamics and of statistical mechanics.

  20. Die erediens as fees of die fees as erediens?: �n Andrew Murray pryswenner �n kwarteeu later herlees

    Directory of Open Access Journals (Sweden)

    Cas Wepener

    2014-08-01

    Full Text Available Worship as feast or feast as worship? Re-reading an Andrew Murray prizewinner one quarter of a century later. The aim of this contribution is to bring the book Die erediens as fees into discussion with the surrounding culture almost one quarter of a century after its publication. The surrounding culture, we shall call, following Martin Stringer and his so-called discourse of globalisation and consumerism, �the feast as worship service�. Based on this discussion, our research question pertains to the value of Die erediens as fees for the field of Liturgical Studies today. An answer is attempted by, firstly, sketching the liturgical landscape as well as national and international liturgical-scientific developments in our day and, secondly, providing a liturgical-aesthetical exploration and positioning Die erediens as fees within these developments and exploration.

  1. Enrico Fermi Awards Ceremony for Dr. Allen J. Bard and Dr. Andrew Sessler, February 2014 (Presentations, including remarks by Energy Secretary, Dr. Ernest Moniz)

    Energy Technology Data Exchange (ETDEWEB)

    Moniz, Ernest [U.S. Energy Secretary

    2014-02-03

    The Fermi Award is a Presidential award and is one of the oldest and most prestigious science and technology honors bestowed by the U.S. Government. On February 3, 2014 it was conferred upon two exceptional scientists. The first to be recognized is Dr. Allen J. Bard, 'for international leadership in electrochemical science and technology, for advances in photoelectrochemistry and photocatalytic materials, processes, and devices, and for discovery and development of electrochemical methods including electrogenerated chemiluminescence and scanning electrochemical microscopy.' The other honoree is Dr. Andrew Sessler, 'for advancing accelerators as powerful tools of scientific discovery, for visionary direction of the research enterprise focused on challenges in energy and the environment, and for championing outreach and freedom of scientific inquiry worldwide.' Dr. Patricia Dehmer opened the ceremony, and Dr. Ernest Moniz presented the awards.

  2. Avaliação da prevalência das seis chaves de oclusão de Andrews, em jovens brasileiros com oclusão normal natural Evaluation of the prevalence of Andrews's six keys to normal occlusion in untreated young brazilian normal occlusion

    OpenAIRE

    Liliana Ávila Maltagliati; Luciana Andrade do Prado Montes; Fernanda Marcondes Machado Bastia; Silvana Bommarito

    2006-01-01

    OBJETIVOS: diante da larga utilização e difusão dos conceitos das seis chaves de oclusão de Andrews como instrumento de diagnóstico e planificação de tratamento, realizamos este trabalho com o objetivo de avaliar a prevalência destas características numa amostra de oclusão normal brasileira. METODOLOGIA: 61 modelos de estudo de indivíduos brasileiros, leucodermas e com oclusão normal natural foram estudados. Foi observada a freqüência com que as seis chaves foram encontradas em cada indivíduo...

  3. Avaliação da prevalência das seis chaves de oclusão de Andrews, em jovens brasileiros com oclusão normal natural Evaluation of the prevalence of Andrews's six keys to normal occlusion in untreated young brazilian normal occlusion

    Directory of Open Access Journals (Sweden)

    Liliana Ávila Maltagliati

    2006-02-01

    Full Text Available OBJETIVOS: diante da larga utilização e difusão dos conceitos das seis chaves de oclusão de Andrews como instrumento de diagnóstico e planificação de tratamento, realizamos este trabalho com o objetivo de avaliar a prevalência destas características numa amostra de oclusão normal brasileira. METODOLOGIA: 61 modelos de estudo de indivíduos brasileiros, leucodermas e com oclusão normal natural foram estudados. Foi observada a freqüência com que as seis chaves foram encontradas em cada indivíduo, bem como quais as chaves de maior e menor freqüência. RESULTADOS E CONCLUSÕES: os resultados demonstraram que a grande maioria dos indivíduos apresentou de uma a três chaves de oclusão e nenhum dos modelos apresentou as seis chaves de oclusão. As características observadas com maior freqüência foram a presença da curva de Spee suave (100%, contatos interproximais justos (42,6% e inclinações corretas (34,4%. A baixa prevalência de oclusões normais naturais na população, que preencham os requisitos propostos por Andrews, leva-nos a refletir sobre a busca desenfreada por padrões tão rígidos.AIM: due to the large use of Andrews's six keys to normal occlusion concept as a tool for diagnosis and treatment planning, we carried out this study with the purpose to evaluate the prevalence of such characteristics in a brazilian sample. METHODS: 61 cast models of untreated subjects with normal occlusion were evaluated. The frequency that the six keys were found in each subject, as well as which were the most or least frequent keys, was observed. The results showed that most of the subjects presented one to three keys and none presented all the six keys. RESULTS AND CONCLUSIONS: the characteristics more frequently observed were: flat curve of Spee (100%, tight interproximal contacts (42,6% and correct tippings (34.4%. The low prevalence of untreated normal occlusion that achieves Andrews's requirements lead us to reflect on the search

  4. Coordination of Trade Secret and Freedom of Speech——Analysis of Case on DVD COPY CONTROL ASSOCIATION v. ANDREW BUNNER%商业秘密与表达自由的协调——DVD COPY CONTROL ASSOCIATION v.ANDREW BUNNER案评析

    Institute of Scientific and Technical Information of China (English)

    万志前

    2006-01-01

    2000年美国加利福尼亚州初审和上诉法院对DVD复制控制协会诉ANDREW BUNNER的判决,涉及到了保护商业秘密与保护表达自由的关系问题.商业秘密和表达自由都是受法律保护的权利,协调两者的关系,需要进行合法性和利益衡量的考察.

  5. Parallel editing, multi-positionality and maximalism – cosmopolitan effects as explored in some art works by Melanie Jackson and Vivienne Dick

    Directory of Open Access Journals (Sweden)

    Rachel Garfield

    2013-08-01

    Full Text Available Garfield produces a critique of minimalist art practice by demonstrating how the artist Melanie Jackson’s Some things you are not allowed to send around the world (2003 and 2006 and the experimental film-maker Vivienne Dick’s Liberty’s booty (1980 – neither of which can be said to be about feeling ‘at home’ in the world, be it as a resident or as a nomad – examine global humanity through multi-positionality, excess and contingency, and thereby begin to articulate a new cosmopolitan relationship with the local – or, rather, with many different localities – in one and the same maximalist sweep of the work. ‘Maximalism’ in Garfield’s coinage signifies an excessive overloading (through editing, collage, and the sheer density of the range of the material that enables the viewer to insert themselves into the narrative of the work. In the art of both Jackson and Dick Garfield detects a refusal to know or to judge the world; instead, there is an attempt to incorporate the complexities of its full range into the singular vision of the work, challenging the viewer to identify what is at stake.

  6. Extended phase space thermodynamics and P-V criticality: Brans-Dicke-Born-Infeld vs. Einstein-Born-Infeld-dilaton black holes

    Energy Technology Data Exchange (ETDEWEB)

    Hendi, S.H. [Shiraz University, Physics Department and Biruni Observatory, College of Sciences, Shiraz (Iran, Islamic Republic of); Research Institute for Astronomy and Astrophysics of Maragha (RIAAM), P. O. Box 55134-441, Maragha (Iran, Islamic Republic of); Tad, R.M.; Armanfard, Z.; Talezadeh, M.S. [Shiraz University, Physics Department and Biruni Observatory, College of Sciences, Shiraz (Iran, Islamic Republic of)

    2016-05-15

    Motivated by a thermodynamic analogy of black holes and Van der Waals liquid/gas systems, in this paper, we study P-V criticality of both dilatonic Born-Infeld black holes and their conformal solutions, Brans-Dicke-Born-Infeld solutions. Due to the conformal constraint, we have to neglect the old Lagrangian of dilatonic Born-Infeld theory and its black hole solutions, and introduce a new one. We obtain spherically symmetric nonlinearly charged black hole solutions in both Einstein and Jordan frames and then we calculate the related conserved and thermodynamic quantities. After that, we extend the phase space by considering the proportionality of the cosmological constant and thermodynamical pressure. We obtain critical values of the thermodynamic coordinates through numerical methods and plot the relevant P-V and G-T diagrams. Investigation of the mentioned diagrams helps us to study the thermodynamical phase transition. We also analyze the effects of varying different parameters on the phase transition of black holes. (orig.)

  7. Power-law and Logarithmic Entropy Corrected Holographic Dark Energy Models in Brans-Dicke Cosmology with Granda-Oliveros Cut-Off

    CERN Document Server

    Pasqua, Antonio; Myrzakulov, Ratbay

    2015-01-01

    In this paper, the cosmological implications of the Power Law Entropy Corrected Holographic Dark Energy (PLECHDE) and the Logarithmic Entropy Corrected Holographic Dark Energy (LECHDE) models in the context of Brans-Dicke (BD) cosmology for both non-interacting and interacting DE and Dark Matter (DM) are studied. As the system infrared cut-off, we choose the recently proposed Granda-Oliveros cut-off, which contains a term proportional to the first time derivative of the Hubble parameter and one term proportional to $H^2$, i.e. the Hubble parameter squared. We obtain the expressions of three quantities, i.e. the Equation of State (EoS) parameter $\\omega_D$, the deceleration parameter $q$ and the evolutionary form of the energy density parameter $\\Omega'_D$ of the PLECHDE and LECHDE models in a non-flat Universe for non-interacting and interacting DE and DM as well. Moreover, we investigate the limiting cases corresponding to: a) absence of entropy corrections; b) Einstein's gravity; and c) concomitantly absenc...

  8. A Study on the Expanding Universe Based on a Model of the Time Variation of its Matter Content in the Framework of Brans-Dicke Theory

    CERN Document Server

    Roy, Sudipto; Sangma, Argho Aranya; Pal, Indrani

    2016-01-01

    A theoretical model of cosmic expansion has been formulated on an assumption of inter-conversion of matter and dark energy, in the framework of Brans-Dicke theory. An empirical scale factor has been used, which generates a signature flip of the deceleration parameter with time. To account for the non-conservation of matter, a function of time f(t) is incorporated into the equation representing the density of matter. Its value at any instant of time is proportional to the matter content of the universe. The functional form of f(t) has been determined from the field equations by using an empirical scalar field parameter expressed in terms of the scale factor. It is found to decrease with time almost monotonically, implying a conversion of matter into dark energy. Using this function f(t), the time variation of the density of matter has been determined and also the expressions regarding the proportions of matter and dark energy of the universe have been formulated. Time variation of gravitational constant, its f...

  9. The Usage of E-Learning Model To Optimize Learning System In Higher Education by Using Dick and Carey Design Approach

    Directory of Open Access Journals (Sweden)

    Anak Agung Gde Satia Utama

    2016-04-01

    Full Text Available Nowadays many universities in the world apply technology enhanced learning in order to help learning activities. Due to the potentials technology enhanced learning offers, recent education using it and universities in particular are trying to apply it. One of the subjects of this research is The Accounting Department of Airlangga University in Surabaya. The idea of this research is to investigate the students about how they know deeply about e-learning system and learning objectives as a first step to conduct e-learning model. After the model completed, the next step is to prepare database learning. Entity Relationship Diagram (ERD can help to explain the model. The purpose of this research was done by using Dick and Carey Design Model. There are nine steps to conduct e-learning model. All steps can be categorized into three steps research: first is the introduction or empirical study, the next step is the design and the last is the feedback after the implementation. The methodology used in this research is using Qualitative Exploratory, by using questionnaire and interviews as data collection techniques. The analysis of the data shows organization requires information about e-learning content, user as a learning subject and information technology infrastructures. E-learning model as one of the alternative learning can help users to optimized learning.

  10. An Analysis and Comparison of Two Short Writings: "Inaugural Address at the University of St. Andrew's" by J.S. Mill and "The University of Utopia" by R.M. Hutchins, Based on Five Criteria.

    Science.gov (United States)

    Poirier, Jeannine M.

    Focusing on the concept of education for work vs. education for living, the author presents a comparative analysis of two works on liberal education, each of which was originally delivered orally to university students: "The Inaugural Address at the University of St. Andrew" by John Stuart Mill and "The University of Utopia" by Robert Maynard…

  11. An Analysis and Comparison of Two Short Writings: "Inaugural Address at the University of St. Andrew's" by J.S. Mill and "The University of Utopia" by R.M. Hutchins, Based on Five Criteria.

    Science.gov (United States)

    Poirier, Jeannine M.

    Focusing on the concept of education for work vs. education for living, the author presents a comparative analysis of two works on liberal education, each of which was originally delivered orally to university students: "The Inaugural Address at the University of St. Andrew" by John Stuart Mill and "The University of Utopia" by…

  12. Quantum logic gates with a two-level trapped ion in a high-finesse cavity beyond the Lamb-Dicke limit

    Energy Technology Data Exchange (ETDEWEB)

    Zheng Xiaojuan [College of Physics and Information Science, Hunan Normal University, Changsha, 410081 (China); Fang Maofa [College of Physics and Information Science, Hunan Normal University, Changsha, 410081 (China); Liao Xiangping [College of Physics and Information Science, Hunan Normal University, Changsha, 410081 (China); Cai Jianwu [College of Physics and Information Science, Hunan Normal University, Changsha, 410081 (China)

    2007-02-14

    In the system with a two-level ion confined both in a linear trap and in a high-Q single-mode cavity, we present a simple scheme to realize the basic two-qubit logic gates such as the quantum phase gate (QPG), the SWAP gate and the controlled-NOT (CNOT) gate beyond the Lamb-Dicke (LD) limit. We realize the three kinds of two-qubit quantum phase gates, i.e. QPG operation involving the cavity mode as well as the vibrational mode of the trapped ion, QPG operation involving the internal states as well as the vibrational mode of the trapped ion and QPG operation involving the internal states of the trapped ion as well as the cavity mode. The controlled-NOT gate can be implemented from a QPG operation through a rotation of the second qubit before and after the QPG operation. We can also perform the SWAP gate operation involving the ionic internal states of the trapped ion and the two-mode bosonic basis. The logic gates involving the cavity mode as well as the vibrational mode of the trapped ion are insensitive to spontaneous emission, and the logic gates involving the internal states as well as the vibrational mode of the trapped ion are insensitive to the decay of the cavity, which is an important feature for the practical implementation of quantum computing. Neither the LD approximation nor the auxiliary atomic level is needed in our scheme. Experimental feasibility for achieving our scheme is also discussed.

  13. Principal component and Tucker3 analyses of high performance liquid chromatography with diode-array detection fingerprints of crude extracts of Erythrina speciosa Andrews leaves

    Energy Technology Data Exchange (ETDEWEB)

    Kaori Soares, Patricia [Instituto de Quimica, Universidade Estadual de Campinas, CP 6154, 13083-970 Campinas, SP (Brazil); Bruns, Roy Edward, E-mail: bruns@iqm.unicamp.br [Instituto de Quimica, Universidade Estadual de Campinas, CP 6154, 13083-970 Campinas, SP (Brazil); Spacino Scarminio, Ieda [Laboratorio de Quimiometria em Ciencias Naturais, Departamento de Quimica, Universidade Estadual de Londrina, CP 6001, 86051-990 Londrina, PR (Brazil)

    2012-07-29

    Highlights: Black-Right-Pointing-Pointer Simultaneous chromatographic, spectroscopic and mixture proportion correlations. Black-Right-Pointing-Pointer Tucker3 analysis of chromatographic, spectral and solvent mixture proportions. Black-Right-Pointing-Pointer HPLC-DAD spectral characterization of chromatographic peaks. - Abstract: Mixtures of ethanol, dichloromethane, hexane and acetone obtained according to a statistical design have been used to extract substances from Erythrina speciosa Andrew leaves for chromatographic fingerprinting. The plant extracts from each mixture were analyzed by HPLC-DAD providing UV-vis spectra for each chromatographic peak. These chromatograms and spectra for the design mixtures were then treated with principal component (PCA), Tucker3 and PARAFAC analyses. PCA indicated the existence of five different chromatographic fingerprints for the leave extracts depending on the solvent mixture composition. Different chromatographic peak areas were strongly correlated with the mixture proportions of acetone, dichloromethane and ethanol. Tucker3 and PARAFAC analyses were very useful for identifying simultaneous correlations between chromatographic peak areas, spectral band absorbances and solvent proportions. The acetone proportion was highly correlated with the area of the 3.69 min retention time peak and the spectral absorbances between 250 and 260 nm, consistent with the presence of natural polyphenols. The dichloromethane mixture proportion was strongly correlated with the 12.19 min chromatographic peak area and a single spectral absorbance at 201 nm. This spectral absorption is characteristic of the electronic structures of terpenes and alkaloids.

  14. Small-scale variations of climate change in mountainous forested terrain - a regional study from H.J. Andrews Long Term Ecological Research site in Oregon, USA

    Science.gov (United States)

    Honzakova, Katerina; Hoffmann, Peter; Jones, Julia; Thomas, Christoph

    2017-04-01

    There has been conflicting evidence as to whether high elevations are experiencing more pronounced climate warming than lower elevations in mountainous regions. In this study we analyze temperature records from H.J. Andrews Long Term Ecological Research, Oregon, USA and several nearby areas, comprising together 28 stations located in Cascade Mountains. The data, starting in 1958, are first checked for quality and homogenized using the Standard Normal Homogeneity Test. As a reference, composite climate time series based on the Global Historic Climate Network is created and together with cross-referencing against station records used to correct breaks and shifts in the data. In the next step, we investigate temperature patterns of the study site from 1958 to 2016 and compare them for valley and hill stations. In particular, we explore seasonality and inter-annual variability of the records and trends of the last day of frost. Additionally, 'cold' sums (positive and negative) are calculated to obtain a link between temperature and ecosystems' responses (such as budbreaks). So far, valley stations seem to be more prone to climate change than ridge or summit stations, contrary to current thinking. Building on previous knowledge, we attempt to provide physical explanations for the temperature records, focusing on wind patterns and associated phenomena such as cold air drainage and pooling. To aid this we analyze wind speed and direction data available for some of the stations since 1996, including seasonality and inter-annual variability of the observed flows.

  15. RECENZJA KSIĄŻKI "WHY ARE YOU SO SCARED? A CHILD'S BOOK ABOUT PARENTS WITH PTSD", B. ANDREWS. WASHINGTON: APA, 2012

    Directory of Open Access Journals (Sweden)

    Wiśniewska, Lidia Anna

    2014-12-01

    Full Text Available The aim of this paper is to present a child’s book „Why Are You So Scared? A Child’s Book About Parents with PTSD”, B. Andrews (illustrations by: K. Kirkland. Washington: APA, 2012. The book is devoted to children whose parents suffer from PTDS. The language used is intelligible for children. A huge advantage of this book are beautiful illustrations and possibilities for children to express their emotions through drawings. The author describes a complex disorder – PTSD – in a clear and comprehensible way. It seems that the book – although dedicated to children – offers a valuable assistance for therapists and psychologists working with families of people with PTSD, as for parents themselves as well. In the same series were published also two different books – for children of parents with depression („Why Are You So Sad? A Child’s Book About Parental Depression” and for military children („I Miss You ! A Military Kid’s Book About Deployment”.

  16. Principal component and Tucker3 analyses of high performance liquid chromatography with diode-array detection fingerprints of crude extracts of Erythrina speciosa Andrews leaves.

    Science.gov (United States)

    Soares, Patricia Kaori; Bruns, Roy Edward; Scarminio, Ieda Spacino

    2012-07-29

    Mixtures of ethanol, dichloromethane, hexane and acetone obtained according to a statistical design have been used to extract substances from Erythrina speciosa Andrew leaves for chromatographic fingerprinting. The plant extracts from each mixture were analyzed by HPLC-DAD providing UV-vis spectra for each chromatographic peak. These chromatograms and spectra for the design mixtures were then treated with principal component (PCA), Tucker3 and PARAFAC analyses. PCA indicated the existence of five different chromatographic fingerprints for the leave extracts depending on the solvent mixture composition. Different chromatographic peak areas were strongly correlated with the mixture proportions of acetone, dichloromethane and ethanol. Tucker3 and PARAFAC analyses were very useful for identifying simultaneous correlations between chromatographic peak areas, spectral band absorbances and solvent proportions. The acetone proportion was highly correlated with the area of the 3.69 min retention time peak and the spectral absorbances between 250 and 260 nm, consistent with the presence of natural polyphenols. The dichloromethane mixture proportion was strongly correlated with the 12.19 min chromatographic peak area and a single spectral absorbance at 201 nm. This spectral absorption is characteristic of the electronic structures of terpenes and alkaloids.

  17. Environmental Assessment for the Construction and Operation of a Battalion Headquarters for the U.S. Army Priority Air Transport at Joint Base Andrews-Naval Air Facility Washington, Prince George’s County, Maryland

    Science.gov (United States)

    2012-12-01

    forest , mixed hardwood/pine forest , oak forest , oak/hickory forest , oak/pine forest , pine forest , red maple swamp, and shallow emergent marsh. The plants...Permit from MDE. Wetlands identified on Andrews include palustrine, forested wetlands and palustrine emergent wetlands, both of which are both primarily...historic sites: 77-00 !- Forest Grove Methodist Church and Cemetery (Chapel 2). and 77-014-Belle Chance and Cemetery. Neither of these properties will be

  18. 从文学人类学视角解析《白鲸》中的圣经原型%Analysis of Biblical archetypes in Moby Dick from the perspective of literary anthropology

    Institute of Scientific and Technical Information of China (English)

    赵攀

    2013-01-01

    Literary anthropology as an interdisciplinary research has been in existence for a long time ,but as a criticism just emerging in domestic study in recent years .Critics recognized Herman Melville using a lot of Biblical archetypes in Moby Dick ,but it is a new entry point for analysis from the perspective of literary anthropology .Melville’s in pursuit of local culture ,concerning on minority culture and his great humanist complex will be seen through by an analysis of biblical character and theme archetypes in Moby Dick from the perspective of literary anthropology .%  评论界公认赫尔曼・麦尔维尔在《白鲸》中使用了大量的圣经原型,但是从文学人类学角度来分析还是一个新的切入点。通过文学人类学的视角分析《白鲸》中使用的《圣经》人物原型和主题原型,透视了麦尔维尔追溯本土文化、关注少数族群文化和伟大的人文主义情结。

  19. 《夜色温柔》中狄克的心理学视角剖析%A Psychological Approach to Dick in Tender Is the Night

    Institute of Scientific and Technical Information of China (English)

    任玲; 翟慧丽

    2015-01-01

    美国作家菲茨杰拉尔德的《夜色温柔》自出版以来,一度被评论界冷落,被认为并不是作者的代表作品。原因在于当时的评论界把这部作品只看作是作者的一个自传。但对《夜色温柔》的文本作深层分析后,不难看出这部小说的创作受到了弗洛伊德和荣格的精神分析学的巨大影响。因此这部小说不应该从作者个人经历或是从社会意义的角度进行剖析,必须从人物的心理入手。依据荣格的“情结理论”和“人格面具理论”,对小说男主人公狄克的心理进行了细致的分析,从而表明《夜色温柔》这部作品具有高度的心理学价值,是对二十年代美国人灵魂深处的刻画,昭示了现代西方人深刻的精神危机。%Since the Tender Is the Night has been published ,it once desolated or neglected by commentary stratum for its unrepresentative features .The reason is that critics consider this works only as an autobiog‐raphy of the author .However ,after deeply analyzing the text in Tender Is the Night ,the theory of psy‐choanalysis of Frend and Jung Carl Gustav was found ,which has a giant effect on it .The psychology of the characters rather than narrate person experience or his social significance was analyzed ,This article has a detailed analysis on the hero‐Dick's psychology based on the Jung Carl Gustav's theory of "complex"and "personality theory"in order to indicate that the works is psychologically valuable .At the same time ,the author wants to prove that the works symbolize the modern westerners'spiritual crisis by describing the twenties Americans .

  20. Hyporheic Geophysics: D.C. Resistivity Imaging of Valley-bottom Alluvium in a 3rd-order Mountain Stream, HJ Andrews Experimental Forest, Oregon, USA

    Science.gov (United States)

    Zarnetske, J. P.; Haggerty, R.; Crook, N.; Robinson, D. A.

    2006-12-01

    The hyporheic zone (HZ) can serve as either a source or a sink for nutrients (e.g., nitrogen) and moderates biogeochemical and temperature signals in stream ecosystems. Understanding of the HZ is hampered by lack of subsurface images, particularly ones that are non-invasive and fast. Geophysical imaging, combined with extant empirical methods and hydrodynamic models provides an opportunity to improve precision in modeling HZ transport and nutrient retention. With the aid of CUAHSI HMF, we completed a d.c. resistivity survey of an existing stream denitrification study site (Mack Creek, H.J. Andrews Experimental Forest, OR, a Long-term Ecological Research site) to quantify the geometry of the valley bottom alluvial aquifer and HZ. The non- invasive d.c. resistivity survey successfully produced a quantitative 3-dimensional image of the variable alluvial aquifer thickness below and adjacent to the stream channel. We extensively imaged one area, 50 m x 28 m with 10 transects, in an old growth Douglas fir (Pseudotsuga menziesii) stand which incorporated a large woody debris log jam, to determine that alluvial thickness averages 4.1 m and varies between 0 m and 8 m. We completed a single 50 m longitudinal section in an adjacent downstream logged block (harvested 1964-65) to determine that alluvial thickness averages 0.3 m and varies between 0 m and 1 m. The presence of valley- bottom bedrock exposures at the study site helped to constrain and verify the d.c. resistivity interpretation of the bedrock-alluvium interface. Some d.c. survey challenges were encountered, including the confinement of electrode lines to the channel or near channel because dry organic layers or fallen trees across much of the forest floor prevented good electrode contact with the ground. Ultimately, this geophysics-enhanced knowledge of the stream-adjacent aquifer will allow for more accurate interpretation of hyporheic observations and parameterization of hyporheic hydraulic and denitrification

  1. Britain at CERN'98 (20-23 October 1998) : Dr Dick Wakelin (right), Chairman of Lancashire Fittings Limited, explains his company's products to the Director General C.H. Llewellyn Smith and to the British Ambassador of Switzerland, H.E. Mr C. Hulse

    CERN Multimedia

    Patrice Loiez

    1998-01-01

    Britain at CERN'98 (20-23 October 1998) : Dr Dick Wakelin (right), Chairman of Lancashire Fittings Limited, explains his company's products to the Director General C.H. Llewellyn Smith and to the British Ambassador of Switzerland, H.E. Mr C. Hulse

  2. Maja "Moby Dick" = House Moby Dick / Jyrki Tasa

    Index Scriptorium Estoniae

    Tasa, Jyrki

    2004-01-01

    2003. a. valminud eramu projekteeris arhitekt Jyrki Tasa. Kivist trepp ja terasest sild viivad teisel korrusel valges seinas asuva peasissekäigu juurde. Talveaed ulatub läbi kahe korruse. Ruume liidavad ka kolm läbipaistvast klaasist ja terasest silda. Fassaadid on kaetud peamiselt vineeriga ning männilattide ja -laudadega. I, II, III korruse plaan, lõige, 3 välis- ja 7 sisevaadet

  3. Maja "Moby Dick" = House Moby Dick / Jyrki Tasa

    Index Scriptorium Estoniae

    Tasa, Jyrki

    2004-01-01

    2003. a. valminud eramu projekteeris arhitekt Jyrki Tasa. Kivist trepp ja terasest sild viivad teisel korrusel valges seinas asuva peasissekäigu juurde. Talveaed ulatub läbi kahe korruse. Ruume liidavad ka kolm läbipaistvast klaasist ja terasest silda. Fassaadid on kaetud peamiselt vineeriga ning männilattide ja -laudadega. I, II, III korruse plaan, lõige, 3 välis- ja 7 sisevaadet

  4. En camino hacia el Moby Dick de Herman Melville, encontré… Algunas notas preliminares de un libro sin escribir On My Way to Herman Melville’s Moby Dick, I Found … Some Preliminary Remarks from an Unwritten Book

    Directory of Open Access Journals (Sweden)

    Burkard Sievers

    2009-06-01

    Full Text Available Propósito: El autor está revisitando el cuerpo de sus manuscritos sobre el Moby Dick de Herman Melville, que comenzó a escribir hace unos 15 años. Aunque estos escritos siguen constituyendo un “libro sin escribir”, las obras de Melville tuvieron un impacto duradero sobre su pensamiento - abrieron nuevo caminos de inspiración- y escritura hasta el presente. El objetivo del documento es revelar algunas experiencias, estímulos, dificultades y emociones concomitantes con la escritura académica que siguen estando en su mayoría, escondidas del lector. Diseño/ metodología/acercamiento: Este artículo es una reminiscencia personal sobre la experiencia de la escritura académica de unas cuatro décadas. Es una historia de cómo un académico se familiariza con, y luego es influenciado/inspirado por una obra literaria, y descubre cuántos tópicos organizacionales pueden ser iluminados por trabajos literarios. Descubrimientos: Ni siquiera un libro sin escribir lleva necesariamente a descuidar completamente lo que había sido escrito. Esto podría ser un alivio y un estímulo para otros, quienes se dan cuenta de que no están solos en este sentido. Originalidad/valor: el artículo aporta un poco más de entendimiento sobre la experiencia no-tan-obvia y generalmente escondida, del “proceso de producción” de la escritura académica, e ilustra la relevancia e importancia de la literatura para pensar más allá, tópicos tales como la Administración y la organización.Purpose: The author is revisiting the body of his manuscripts on Herman Melville’s Moby Dick, which he began writing some 15 years ago. Though these writings have remained an ‘unwritten book’, Melville’s works had a lasting impact on his thinking and writing up to the present. He reveals some of the experiences and emotions concomitant with academic writing that remain more often than not hidden from the reader. Design/methodology/approach: This paper is a personal

  5. Demokraatia taganemine Venemaal / Dick Lugar

    Index Scriptorium Estoniae

    Lugar, Dick

    2005-01-01

    17. veebruaril USA Senatis esitatud Senati väliskomisjoni esimehe ettekanne, milles ta käsitles olukorda Venemaal, Venemaa katset sekkuda Ukraina valimistesse, toetust Gruusia separatistlikele regioonidele. Komisjoni esimehe sõnul peab USA jätkama Venemaale surve avaldamist, et seal hakkaks kehtima vaba ja õiglane poliitiline ning õiguslik süsteem

  6. Demokraatia taganemine Venemaal / Dick Lugar

    Index Scriptorium Estoniae

    Lugar, Dick

    2005-01-01

    17. veebruaril USA Senatis esitatud Senati väliskomisjoni esimehe ettekanne, milles ta käsitles olukorda Venemaal, Venemaa katset sekkuda Ukraina valimistesse, toetust Gruusia separatistlikele regioonidele. Komisjoni esimehe sõnul peab USA jätkama Venemaale surve avaldamist, et seal hakkaks kehtima vaba ja õiglane poliitiline ning õiguslik süsteem

  7. Feeding behavior of hummingbirds and perching birds on Erythrina speciosa Andrews (Fabaceae flowers in an urban area, Londrina, Paraná, Brazil Comportamento alimentar de beija-flores e Passeriformes nas flores de Erytrhina speciosa Andrews (Fabaceae em uma área urbana de Londrina, Paraná, Brasil

    Directory of Open Access Journals (Sweden)

    Luciana Baza Mendonça

    2006-03-01

    Full Text Available Nine species of birds - seven hummingbirds (Trochilidae and two Passeriformes - were observed visiting the flowers of Erythrina speciosa Andrews (Fabaceae, a hummingbird-pollinated species present on the campus of Londrina State University, Paraná State, Brazil. Nectar in bagged flowers bore little relationship with nectar in flowers opened to foragers either regarding quantity or diurnal pattern of availability. Birds were more frequent early in the morning and their activity on flowers further declined, apparently following the pattern of nectar availability. The manner to which birds probed the flowers and, in consequence, their role on pollination were greatly determined by morphological traits and approaching behavior of birds. E. speciosa seemed best suited for pollination by long-billed hummingbirds but some short to medium-billed species may play some role on its pollination.Nove espécies de aves - sete beija-flores (Trochilidae e duas aves Passeriformes - foram observados visitando as flores de Erythrina speciosa Andrews (Fabaceae, uma espécie polinizada por beija-flores presente no campus da Universidade Estadual de Londrina, Paraná, Brasil. O néctar em flores ensacadas apresentou pouca relação com aquele em flores expostas aos visitantes, tanto em termos de quantidade como em temos de padrão diurno de disponibilidade. As aves foram mais freqüentes de manhã e sua atividade nas flores diminuiu no transcorrer do dia, coincidindo com o padrão de disponibilidade de néctar. O comportamento de visita das aves e, em conseqüência, sua atuação na polinização da espécie foram em grande parte determinadas por características morfológicas e comportamentais destas. E. speciosa parece ser adaptada para polinização por beija-flores de bicos longos, embora espécies com bicos de comprimento curto a médio possam ter algum papel em sua polinização.

  8. Interview with Andrew C. Kadak

    Energy Technology Data Exchange (ETDEWEB)

    Schabes, D. [ed.

    1996-01-01

    This article is an interview with the president and Chief Executive Officer of the Yankee Atomic Electric Company about a wide variety of aspects of the decommissioning of the Yankee Nuclear Power plant. Included are discussions of political aspects, decommissioning schedules, local impacts, technical issues of decommissioning, personnel management during decommissioning, etc.

  9. FLOODPLAIN, ANDREW COUNTY, MISSOURI, USA

    Data.gov (United States)

    Federal Emergency Management Agency, Department of Homeland Security — The Digital Flood Insurance Rate Map (DFIRM) Database depicts flood risk information and supporting data used to develop the risk data. The primary risk...

  10. IDENTIFICACIÓN DE LAS CARACTERÍSTICAS DE UNA OCLUSIÓN IDEAL AL TÉRMINO DEL TRATAMIENTO DE ORTODONCIA SIN EXTRACCIONES, MEDIANTE LAS LLAVES DE LA OCLUSIÓN DE ANDREWS.

    OpenAIRE

    Contreras Alvarado, Karla

    2012-01-01

    Antecedentes: A principios de los años setenta el Dr. Lawrence F. Andrews publicó un artículo en el que discute seis características significativas que se encontraron constantemente en un estudio realizado a 120 pacientes no ortodóncicos con una oclusión normal. El autor se refirió a estas cualidades como las Seis llaves de la oclusión normal (Six keys to normal occlusion) Hoy día siguen vigentes e importantes en el éxito de un tratamiento ortodóntico. Objetivo: Identific...

  11. THE COMPARİSON OF TWO COMMENTARİES FROM THE METHOD ANGLE MADE BY WALTER G. ANDREWS AND İSKENDER PALA OF NABİ’S “GELÜR GİDER” RHYMED GAZEL / NÂBÎ’NİN “GELÜR GİDER” REDİFLİ BİR GAZELİNE WALTER G. ANDREWS ve İSKENDER PALA TARAFINDAN YAPILAN İKİ ŞERHİN METOT AÇISINDAN MUKAYESESİ

    Directory of Open Access Journals (Sweden)

    Turgut KOÇOĞLU (M.A.H.

    2007-08-01

    Full Text Available “Şerh” means to commentary the literal texts and make the understood. The classical Turkish Literature works are commentaried in şerh. As the classical Turkish literature were explained in the past, they are today done in the şerh. The conventionel şerh methods have been used since 14th century. At present modern şerh method are being used. Nâbî’s, 17th century, gazel were commentaried by Walter G. Andrews and İskender Pala. The study of these two scientists’ şerh method, could be useful from the text şerh point of view.

  12. A Quantum of Solace: Guzman on the Classical Mechanics of International Law - Book Review: Andrew Guzman, How International Law Works. A Rational Choice Theory (2008

    Directory of Open Access Journals (Sweden)

    Matthias Goldmann

    2009-02-01

    in mind in order to assess the quantum of solace that Andrew Guzman’s new book provides.

  13. TOWARDS THE PROBLEM OF THE SO CALLED «COMPOUND FUTURE II» SEMANTICS IN THE OLD RUSSIAN LANGUAGE (ON THE MATERIAL OF THE LIFE OF ST. ANDREW THE FOOL

    Directory of Open Access Journals (Sweden)

    Yana A. Penkova

    2014-01-01

    Full Text Available The paper deals with an analysis of semantic and syntactic peculiarities of the budet + l-form construction in the Life of the St. Andrew the Fool. The usage of the construction in question in this manuscript doesn’t coincide with what is typical for the majority of Old Russian texts, original or translated, so that it allows us to delineate three uses of the budet + l-form construction and to conclude that the latter was not restricted to conditional clauses, but could be used more widely: not only as a reference to any time earlier than some future moment, but also as a marker of pure resultativity in the future or even as a marker of supposition. Obviously, budet + l-form construction wasn’t just a relative future form, but rather a perfect form which could acquire modal and evidential semantic components. 

  14. A Study of Transition of the Expansion of the Universe from a Phase of Deceleration to Acceleration through a Conversion of Matter into Dark Energy in the Framework of Brans-Dicke Theory

    CERN Document Server

    Roy, Sudipto

    2015-01-01

    The present study is based on a generalized form of Brans-Dicke (BD) theory where, the dimensionless BD parameter is regarded as a function of the scalar field, which is reciprocal of the gravitational constant. The field equations have been solved by incorporating an empirical function f(t) in the expression representing the conservation of matter. This function f(t) has been chosen to account for a conversion of matter (both dark and baryonic) into some other form, possibly dark energy, which is known to be responsible for the accelerated expansion of universe. The requirement of a signature flip of the deceleration parameter (q), which is evident from other studies, sets the boundary conditions to be satisfied by the function f(t), leading to the formulation of its time dependence. A simple empirical relation was initially assumed to represent the time dependence of f(t), and the constants in this expression have been determined from these boundary conditions. The BD parameter has been found to have a nega...

  15. Physiology and Anatomy for Nurses and Healthcare Practitioners: A Homeostatic Approach - Third edition Clancy John McVicar Andrew J Physiology and Anatomy for Nurses and Healthcare Practitioners: A Homeostatic Approach - Third edition 768pp Hodder Arnold 9780340967591 0340967595 [Formula: see text].

    Science.gov (United States)

    2010-02-10

    John Clancy and Andrew McVicar give a fascinating insight into the homeostatic mechanism for health. The content focuses on the body's adaptive responses in health and the maladaptive processes in ill-health. In turn, these processes are linked to the knowledge required by healthcare professionals in restoring health or enhancing the quality of life until death.

  16. Melville's Construction of National Literature in the Light of Language Style in Moby-Dick%从《白鲸》的语言风格看梅尔维尔对民族文学的建构

    Institute of Scientific and Technical Information of China (English)

    黄永亮

    2016-01-01

    Melville's Moby-Dick was published in response to the call for the independence of American national literature .Languages of different styles are used in the novel according to what the author wants to present .They invest the work with epic grandeur .The elegant and lofty dramatic language presenting Ahab creates an image of American tragic hero .With its simplicity and lucidity , the encyclopedic language , on the one hand , introduces the knowledge about whales and whaling with an emphasis on the limitedness of hu -man knowledge and the vastness of nature;on the other hand , it reveals the complexity of human world in the author's discussion about social and human issues .With a combination of description , lyricism, and i-magination , the lyric language in describing the ocean unrolls a mysterious picture of the ocean .%19世纪美国人民呼唤民族文学的独立,梅尔维尔的《白鲸》应运而生。小说使用了不同风格的语言以表达不同的内容,也使作品具有史诗般的恢弘气势。高雅的戏剧语言将埃哈伯塑造为一个美国式的悲剧英雄。介绍鲸鱼和捕鲸业知识的百科全书式语言相对平实直白,旨在强调人类认识的有限和大自然的浩瀚无垠。作者还用百科全书式语言来讨论社会人文问题,体现人类社会的复杂性。描写海洋的语言如同抒情诗一般,集描写、抒情、想象为一体,展现一个神秘莫测的大海。

  17. 牡丹反转录转座子RT基因的分离与序列分析%Isolation and Characterization of Ty1-copia Retrotransposon Sequence from Paeonia suffruticosa Andrews

    Institute of Scientific and Technical Information of China (English)

    贾甜甜; 郭大龙; 侯小改; 刘改秀; 王丽娜; 张修铭; 李双双

    2012-01-01

    以牡丹基因组为模板,利用简并引物进行PCR扩增,得到了编码Ty1-copia类反转录转座子反转录酶(RT基因)的序列,测序后所得序列长度为240 bp,包含2个开放读码框,共编码63个氨基酸.经NCBI中BLAST比对结果显示,洛阳红牡丹RT基因与枸杞、甜菜等RT基因的同源性均在70%以上.经MEGA和DNAstar软件分析表明,该片段在进化上与梅、杨、茶和苹果等落叶木本植物的同源性序列存在更高的同源性和更近的亲缘关系,与枸杞、鹰嘴豆、番茄、草莓等草本植物的同源性序列亲缘性较远.%With degenerate primer,the Tyl-copio-like retrotransposon sequence fragments were amplified from peony (Paeonia suffruticosa Andrews. ) genomic DNA and sequemced, getting a 240-bp PCR fragment which contains two open reading frames and encodes 63 amino acids. The results of BLAST in CenBank showed that the RT gene sequence of peony had more than 70% similarity with those of Lycium chinense and Beta vulgaris ,etc. A phylo-genetic analysis by MEGA and DNAstar software showed that the sequence had higher homology and closer paternity with those of deciduous woody trees such as Prunus mume, Populus ciliate, Camellia sinensis and Malus x domestica than those of herbaceous plants such as L. barbarum ,Cicer arietinum,Lycopersicon esculenlum and Fragaria viridis.

  18. On the Three Dimensions of Post Marxism Critique of Technology from Andrew Feenberg%论安德鲁·芬伯格后马克思主义技术批判的三个维度

    Institute of Scientific and Technical Information of China (English)

    殷华成

    2013-01-01

    Andrew Feenberg is an important representative of the new generations of Frankfurt school ,and fa-mous technical critique of contemporary western theorists .From perspective of the post Marxist:technology“design criticism” on the basis of criticism of technical nature ,proposed a constructivist view of technology;Learn from technology politics criticism ,deconstruction of hegemony of technology ,construction technology into micro-politics of paths;Through technical and cultural criticism and modern western culture ,justify a choice of modern roads.He showed three new dimensions of critical theory of technology ,reflected the technical criticism of Frankfurt School ’ s critique of capitalism .%安德鲁·芬伯格是新一代法兰克福学派的重要代表,当代西方著名技术批判理论家。他从后马克思主义的视角,以技术的“设计批判”为基础,批判了技术本质主义,提出了建构主义技术观;借鉴技术的政治学批判,解构了技术霸权,构建了技术转化的微政治学路径;通过技术的文化批判,颠覆了现代西方文化观,论证了可选择的现代性道路。他所展现的技术批判理论的三个新维度,体现了法兰克福学派批判资本主义的技术批判转向。

  19. Dick and Jane and Technology Education.

    Science.gov (United States)

    Roman, Harry T.

    2002-01-01

    Science education and technology education have a common lineage. Contrary to prevailing beliefs, technology involves both process and content. It cuts across and unifies curricula and should be taught across all grade levels. (JOW)

  20. Detecting Multiparticle Entanglement of Dicke States

    DEFF Research Database (Denmark)

    Lücke, Bernd; Peise, Jan; Vitagliano, Giuseppe

    2014-01-01

    Recent experiments demonstrate the production of many thousands of neutral atoms entangled in their spin degrees of freedom. We present a criterion for estimating the amount of entanglement based on a measurement of the global spin. It outperforms previous criteria and applies to a wider class...

  1. Andrew Cole, The Birth of Theory

    Directory of Open Access Journals (Sweden)

    Corrado Confalonieri

    2016-06-01

    Full Text Available “Back to Hegel” è il titolo di un pezzo con cui Luca Illetterati presentava a fine 2014 su Alias (ma l’articolo è leggibile anche online, sul sito di hegelpd e sul blog Le parole e le cose le linee principali di due libri di Terry Pinkard allora da poco usciti in edizione italiana (La fenomenologia di Hegel: la socialità della ragione, a cura di Andrea Sartori e Italo Testa, traduzione di Andrea Sartori, Milano-Udine, Mimesis, 2013, e La filosofia tedesca 1760-1860: l’eredità dell’idealismo, a cura di Mario Farina, Torino, Einaudi, 2014 che costituiscono un nucleo importante del ritorno di interesse per la filosofia di Hegel verificatosi negli ultimi tre decenni in area nordamericana.

  2. 431-IJBCS-Article-Andrew H Siwela

    African Journals Online (AJOL)

    User

    examined for nematode parasite infections using coporological methods. Direct smear and salt ... Lipid peroxidation was assayed by determining malondialdehyde (MDA) levels. Significantly higher ... AND METHODS. Parasitological analysis.

  3. Millikan, Robert Andrews (1868-1953)

    Science.gov (United States)

    Murdin, P.

    2000-11-01

    Physicist, born in Morrison, IL, Nobel prizewinner (1923) for his determination of the charge on the electron by Millikan's oil-drop experiment, and confirmation of Einstein's quantum photoelectric theory. Coined the term `cosmic rays'....

  4. Molecular Cloning and Expression of VpLFY Gene from Vanilla(Vanilla planifolia Andrews)%香草兰V pLFY 基因的克隆与表达分析①

    Institute of Scientific and Technical Information of China (English)

    顾文亮; 王辉; 庄辉发; 王华; 朱自慧; 宋应辉

    2016-01-01

    花分生组织特征基因LEAFY 在植物花芽分化与成花诱导途径中起着重要的调控作用。通过RACE方法从香草兰中克隆VpLFY 基因的全长cDNA序列。结果显示,该基因包含一个1493 bp的开放阅读框,编码491个氨基酸残基。经蛋白质序列同源比对分析结果发现, VpLFY属于FLO-LFY家族。组织特异性研究结果表明,VpLFY 基因在香草兰组织中属于组成型表达。荧光定量分析结果表明, VpLFY 基因分别在香草兰纯花芽和混合花芽的不同发育阶段中有着较强的表达。%Floral meristem identity gene LEA FY is a master regulator of flower bud differentiation and floral induction. In this study, we report the molecular characteristics of LFY gene cloned from Vanilla(Vanilla planifolia Andrews) using a RACE-PCR based strategy. VpLFY contained an open reading frame of 1 493 bp which encoded a polypeptide of 491 amino acids. Protein alignment showed that V pLFY contained typical domains which belonged to FLO-LFY protein family. Tissue-specific studies showed that the expression of VpLFY was constitutive expressed in various tissues of Vanilla. Fluorescent quantitative PCR analysises indicated that the expression of V pLFY were increased in reproductive bud and mixed bud at different stages of Vanilla flower bud differentiation. These results suggest that VpLFY may play an important role in the regulation of Vanilla flower bud differentiation and floral induction.

  5. 人·大海·启示——以《白鲸》、《海狼》和《老人与海》为例%Man, Sea and Revelation -- as Presented in Moby Dick, The Sea Wo/fand The Old Man and the Sea

    Institute of Scientific and Technical Information of China (English)

    易建红

    2012-01-01

    This paper makes a compararive study of three classical American sea novels, that is, Moby Dick, The Sea Wolf and The Old Man and the Sea in the perspectives of ecocriticism and cultural criticism and from the analysis we come to the conclusion that "conquest-and- return" remains the trend in spite of the dynamic changes in the man-and-sea relationship in one century. The disappearance of Pequod and its crew except Ishmael from the sea, the mysterious death of Wolf Larsen and the initial success and subsequent failure of Santiago can be viewed as the warnings from the sea. To protect the ecosystem of the sea is to guarantee the future of the human race. This is the revelation we get from the sea.%本文运用生态批评和文化批评相结合的方法对美国海洋小说中的3部经典之作即《白鲸》(1851)、《海狼》(1904)和《老人与海》(1952)进行了纵向对比研究,并从中得出结论:尽管一个世纪间人海关系呈现出动态变化,"征服与回归"始终是贯穿其间的主线。"披谷德号"的船毁人亡,拉尔森的神秘消亡及圣地亚哥"一线胜利二线失败"的结局是海洋给人类发出的生态预警。保护海洋就是保护人类未来,这是大海的启示。

  6. Лапис Лазули от пещта. Стъкло и стъклопроизводство през късната бронзова епоха. Рецензия на Andrew Shortland. Lapis Lazuli from the Kiln. Glass and Glassmaking in the Late Bronze Age. Leuven: Leuven University Press, 2012. (Studies in Archaeological Sciences 2

    Directory of Open Access Journals (Sweden)

    Ivelin Kuleff

    2016-12-01

    Full Text Available Lapis Lazuli from the Kiln. Glass and Glassmaking in the Late Bronze Age. Book review: Andrew Shortland. Lapis Lazuli from the Kiln. Glass and Glassmaking in the Late Bronze Age. Leuven: Leuven University Press, 2012. (Studies in Archaeological Sciences 2

  7. Single-bubble sonoluminescence as Dicke superradiance at finite temperature

    Science.gov (United States)

    Aparicio Alcalde, M.; Quevedo, H.; Svaiter, N. F.

    2014-12-01

    Sonoluminescence is a process in which a strong sound field is used to produce light in liquids. We explain sonoluminescence as a phase transition from ordinary fluorescence to a superradiant phase. We consider a spin-boson model composed of a single bosonic mode and an ensemble of N identical two-level atoms. We assume that the whole system is in thermal equilibrium with a reservoir at temperature β-1. We show that, in a ultrastrong-coupling regime, between the two-level atoms and the electromagnetic field it is possible to have a cooperative interaction of the molecules of the gas in the interior of the bubble with the field, generating sonoluminescence.

  8. Comparison between Kemp, Smith & Ragan, Dick & Carey's Instructional Design Models

    Science.gov (United States)

    Birgili, Bengi

    2013-01-01

    Instructional design (ID) is systematic way of suggesting a structure and giving meaning to an instructional problem by helping to visualize the problem and breaking into discrete and manageable units. In addition, ID is a systematic reflective process of applying instructional principles into plans by material, activity, resources and evaluation…

  9. Carl Woese, Dick Young, and the roots of astrobiology.

    Science.gov (United States)

    Rummel, John D

    2014-01-01

    The beginning of the space age in the late 1950s gave rise to innovative and interdisciplinary research concepts and perspectives, including the concept of "exobiology" as a way to approach the fundamental aspects of biology through a study of life outside of the Earth, if it existed. This concept was embodied by NASA into its formal Exobiology Program and into the philosophy of the program both before and after the Viking missions that were launched to Mars to search for signs of life in 1975. Due to both management flexibility and an acceptance of the interdisciplinary nature of the problem of "life in the universe," NASA program managers, and particularly Richard S Young who ran the Exobiology Program beginning 1967, have made some excellent investments in paradigm altering science of great use both on Earth and on future space missions. The work of Carl Woese is one such example, which has revolutionized our understanding of the microbial world and the relationships of all life on Earth.

  10. Andrew Johnson National Historic Site Tract and Boundary Data

    Data.gov (United States)

    National Park Service, Department of the Interior — These ESRI shape files are of National Park Service tract and boundary data that was created by the Land Resources Division. Tracts are numbered and created by the...

  11. USA hiiglane GE Healthcare korraldab meditsiinis revolutsiooni / Andrew Jack

    Index Scriptorium Estoniae

    Jack, Andrew

    2006-01-01

    General Electricu tütarettevõte GE Healthcare võttis üle Briti diagnostika- ja bioteaduse uurimisfirma Amersham, firma strateegia tuum on võimsa skaneerimistehnoloogia ja meditsiinilise diagnostika üksteisele lähendamine. Lisa: Aeg sorteerida andmeid infotehnoloogia abil

  12. General Christopher C. Andrews: Leading the Minnesota Forestry Revolution

    Science.gov (United States)

    Rice, Anna M.

    2002-01-01

    In the nineteenth century, America's burgeoning population certainly did grab all the timber it could. Vast pine forests stretched from Maine to Dakota, and the lumber industry voraciously consumed them from east to west. In 1800, the Minnesota territory was sparsely sprinkled with fur traders and American Indians. By 1850, its bounteous forests…

  13. Tensions at EU-Russia Summit / Andrew Rettman

    Index Scriptorium Estoniae

    Rettman, Andrew

    2009-01-01

    Enne Euroopa Liidu-Venemaa tippkohtumist Kaug-Idas ütles Tšehhi president Vaclav Klaus päevalehes Lidove Noviny, et ta ei näe Venemaas ohtu, vaid suurt, tugevat ja ambitsioonikat riiki, millele tuleb rohkem tähelepanu pöörata kui riikidele nagu Eesti ja Leedu. President Toomas Hendrik Ilves väljendas üllatust, et selliste kahetsusväärsete sõnadega - mis jagavad Euroopa riigid olulisteks ja ebaolulisteks - esines just tšehh

  14. Points of correction: Comment on Andrew Bank's 'Archie Mafeje'1

    African Journals Online (AJOL)

    It is our contention here that Bank's study is flawed both methodologically and theoretically. ... and scientific methods, the book is an exercise in journalism. In his introductory ... (with a wife and a child) be said to be a young man? ..... to Wilson which explains why the former divorced his first wife and left Dar es Salaam.

  15. Speaking Unassisted: Comments on a Paper by Andrews et al.

    Science.gov (United States)

    Wingate, Marcel E.

    1983-01-01

    In a reply to a review of replicated findings on stuttering, the author adds 14 points concerning symptoms, prevalence, incidence, stutterer-nonstutterer differences, and variability of stuttering. He takes exception to the review's statements on treatment and theories of stuttering. (CL)

  16. USA hiiglane GE Healthcare korraldab meditsiinis revolutsiooni / Andrew Jack

    Index Scriptorium Estoniae

    Jack, Andrew

    2006-01-01

    General Electricu tütarettevõte GE Healthcare võttis üle Briti diagnostika- ja bioteaduse uurimisfirma Amersham, firma strateegia tuum on võimsa skaneerimistehnoloogia ja meditsiinilise diagnostika üksteisele lähendamine. Lisa: Aeg sorteerida andmeid infotehnoloogia abil

  17. Installation Restoration Program. Phase 1. Records Search Andrews AFB. Maryland

    Science.gov (United States)

    1985-06-01

    tS PNIISCATA- WAYN of growth include grasses, shrubs and mature deciduous trees including beech, oak and gum. Small stands of Virginia pine occur...Division 208 Carroll Building 8600 LaSalle Road Towson , MD 21204 301/828-1 535 RCRA Enforcement Section Vickie Province, Compliance US Environmental

  18. Human reproductive cloning: an analysis of the Andrews Report.

    Science.gov (United States)

    Little, Kim

    2002-01-01

    There is nothing like an overwhelming consensus of opinion to encourage a less than rigourous approach to analyzing complex ethical issues. Unfortunately, this is nowhere more apparent than in the discussion of human reproductive cloning contained in the federal House of Representatives Standing Committee on Legal and Constitutional Affairs' report on human cloning, released last August. The report may well fulfil the first half of its project, namely the empirical task of adequately summarizing and categorizing the various submissions made to the Committee. However, it is clearly inadequate as a discussion of the ethical and legal permissibility of human reproductive cloning.

  19. Building Points - MO 2014 Andrew Structure Points (SHP)

    Data.gov (United States)

    NSGIC GIS Inventory (aka Ramona) — Staff at the Geographic Resources Center placed attributed points on all roofed structures visible at a scale of 1:2000 using MSDIS-DOQQ 2008 2-foot aerial imagery...

  20. SINK OR SWIM? DEBT REVIEW'S AMBIVALENT "LIFELINE" ---- A SECOND SEQUEL TO "… A TALE OF TWO JUDGMENTS" NEDBANK V ANDREWS (240/2011 2011 ZAECPEHC 29 (10 May 2011; FIRSTRAND BANK LTD V EVANS 2011 4 SA 597 (KZD AND FIRSTRAND BANK LTD V JANSE VAN RENSBURG 2012 2 All SA 186 (ECP

    Directory of Open Access Journals (Sweden)

    L Steyn

    2012-11-01

    Full Text Available The interface between the National Credit Act 34 of 2005 and the Insolvency Act 24 of 1936 has been the object of our courts' attention in a number of recent cases including Ex parte Ford and Two Similar Cases 2009 3 SA 376 (WCC, Investec Bank Ltd v Mutemeri 2010 1 SA 265 (GSJ, Naidoo v ABSA Bank Ltd 2010 4 SA 597 (SCA and, more recently, Nedbank v Andrews (240/2011 2011 ZAECPEHC 29 (10 May 2011, FirstRand Bank Ltd v Evans 2011 4 597 (KZD and FirstRand Bank Ltd v Janse van Rensburg 2012 2 All SA 186 (ECP. The question raised in all of the three most recent cases was whether or not a debtor's application for debt review in terms of the National Credit Act constitutes an "act of insolvency" in terms of section 8 of the Insolvency Act, upon which a creditor may rely in an application for the compulsory sequestration of the debtor's estate. If it does, it would mean that by resorting to the debt relief measures provided by the National Credit Act a debtor commits the very act on which a creditor may base an application for a sequestration order which, if granted, will render the debtor's estate insolvent and bring about the liquidation of his assets. From the debtor's perspective, this is probably precisely the situation that he seeks to avert by applying for debt review. Further, sequestration would frustrate the stated purpose of the National Credit Act, which is that debtors should take responsibility for their debts by satisfying them in full. Concurrent creditors might also ultimately receive a dividend which falls far short of what is due to them. The question of whether a debtor's resorting to debt review may or should be the very act that triggers his estate's sequestration and its attendant consequences is an important issue, the treatment of which impacts significantly on the efficacy of the South African consumer debt relief system. This article analyses the most recent judgments and considers whether or not statutory regulation of the

  1. The United States Air Force Academy: A Bibliography 2001-2005

    Science.gov (United States)

    2006-01-01

    Faldons. WEEKLY COMPILATION OF PRESIDENTIAL DOCUMENTS May 16, 2003: 612-613. PERIODICAL ARTICLES 31. Academy names new women’s basketball coach...succeed. CHECKPOINTS Fall 2003: 50-51. 382. Popovich, 󈨊, NBA Coach of the Year. CHECKPOINTS Spring 2003: 50. 383. Rauschkolb, Dick...178 185 Basketball 31 38 45 Battlebots Tournament 64 Beer, Heather 128 Bell, Luke 65 Benn, Elizabeth 245 Biancur, Andrew W 314 Big Brothers

  2. Andrew Smith: Lääne ja Aasia firmad reageerivad kriisile erinevalt / Andrew Smith ; intervjueerinud Mikk Salu

    Index Scriptorium Estoniae

    Smith, Andrew

    2009-01-01

    Intervjuu KPMG peaökonomistiga majanduslangusest Euroopas, Eesti ja Suurbritannia käitumisest kriisi ajal, lääneriikide ja Aasia erinevast reageeringust majanduskriisile, Suurbritannia mitteliitumisest euroga, peaminister Gordon Brownist

  3. Alkaloids from flowers and leaves of Erythrina speciosa Andrews; Alcaloides de flores e folhas de Erythrina speciosa Andrews

    Energy Technology Data Exchange (ETDEWEB)

    Faria, Terezinha de Jesus; Cafeu, Mariana Carrara; Akiyoshi, Gisele; Ferreira, Dalva Trevisan; Galao, Olivio Fernandes; Andrei, Cesar Cornelio [Universidade Estadual de Londrina, PR (Brazil). Dept. de Quimica]. E-mail: tjfaria@uel.br; Pinge Filho, Phileno; Paiva, Manoel Ronaldo Carvalho [Universidade Estadual de Londrina, PR (Brazil). Dept. de Ciencias Patologicas; Universidade Estadual de Londrina, PR (Brazil). Dept. de Biologia Animal e Vegetal; Barbosa, Aneli de Melo [Universidade Estadual de Londrina, PR (Brazil). Dept. de Bioquimica; Braz-Filho, Raimundo [Universidade Estadual do Norte Fluminense, Campos dos Goytacazes, RJ (Brazil). Setor de Quimica de Produtos Naturais

    2007-05-15

    In vitro bioassays with leave extracts of Erythrina speciosa showed promising activity against Trypanosoma cruzi. From the flowers of E. speciosa two alkaloids were isolated: erysotrine and erythartine. The leaves furnished one alkaloid, nororientaline. The structures were determined on the basis of spectroscopic evidence. This is the first report about the investigation of alkaloids in flowers and leaves of this species, as well the first report of nororientaline occurrence in this plant. (author)

  4. Andrew Smith: Lääne ja Aasia firmad reageerivad kriisile erinevalt / Andrew Smith ; intervjueerinud Mikk Salu

    Index Scriptorium Estoniae

    Smith, Andrew

    2009-01-01

    Intervjuu KPMG peaökonomistiga majanduslangusest Euroopas, Eesti ja Suurbritannia käitumisest kriisi ajal, lääneriikide ja Aasia erinevast reageeringust majanduskriisile, Suurbritannia mitteliitumisest euroga, peaminister Gordon Brownist

  5. Talking about Life

    Science.gov (United States)

    Impey, Chris

    2010-08-01

    Preface; Part I. Introduction Timothy Ferris, Iris Fry, Steven Dick, Ann Druyan, Pinky Nelson, Neil Tyson, Steve Benner and William Bains; Part II. Earth Roger Buick, Lynn Rothschild, John Baross, Joe Kirschvink, Andrew Knoll, Simon Conway Morris, Roger Hanlon and Lori Marino; Part III. Solar System Chris McKay, David Grinspoon, Jonathan Lunine, Carolyn Porco, Laurie Leshin, Guy Consolmagno and Peter Smith; Part IV. Exoplanets Alan Boss, Geoff Marcy, Debra Fischer, Sara Seager, David Charbonneau and Vikki Meadows; Part V. Frontiers Jill Tarter, Seth Shostak, Ray Kurzweil, Nick Bostrom, Paul Davies, Martin Rees, Ben Bova and Jennifer Michael Hecht; Reading list; Glossary; Index.

  6. Special Interview With Andrew Hale, a keyboard player of 'Sade' Band%特别采记Andrew Hale--Sade乐队键盘手

    Institute of Scientific and Technical Information of China (English)

    2001-01-01

    @@ 对于"rock"这个词,我们也许可以理解为如岩石般"毫不动摇而始终存在于某处"的一种东西 Sade在沉寂了一段时间之后,终于推出了一张新的专辑.那么,为什么这张专辑花费了这么长的时间呢?

  7. OPTIMASI PROSES MASERASI VANILI (Vanilla planifolia Andrews HASIL MODIFIKASI PROSES KURING [Maceration Process Optimation of Vanili (Vanilla Planifolia Andrews from Modified Curing

    Directory of Open Access Journals (Sweden)

    Ika Mariska3

    2006-08-01

    Full Text Available Modified cured vanilla was processed to vanilla extract by maceration method. The aim of this research were to optimize the method of maceration, type of vanilla bean with highest vanillin content, extraction solvent composition,and other variables that could optimize the vanillin content and characterize the extract from half dried cured vanilla. The optimation used response surface method with 22 factorial and 23 factorial. One step of maceration could extract vanillin (average 2.3 g/l much more than two steps maceration (average 2.1 g/l. Vanillin content of the half dried cured vanilla (average 0.98 g/l was higher than cured vanilla 1 and cured vanilla 2 (average 0.41 g/l and 0.32 g/l. The suitable ethanol-water composition for half dried cured vanilla was 7:3 (vanillin content 1.78 g/l. The first optimation was conducted with two variables maceration time and sucrose concentrations. The maximum vanillin content of the first optimation was 4.5 g/l at maceration time of15.9 days and sucrose concentration of 7.3 g. The second optimation used two variables: maceration time and glycerol concentrations. The maximum vanillin content of the second optimation was 3.8 g/l at maceration time of 22 days and glycerol concentration 19.9 ml. The third optimation process used three variables:maceration time, sucrose concentrations and glycerol concentrations. The maximum vanillin content of the third optimation was 3.4 g/l at maceration time of 12 days sucrose concentration of 7 g, and glycerol concentration 4.7 ml. The characteristic of vanilla extract resulted from half dried cured vanilla maceration were vanillin content (3.4-4.5 g/l, total acid (380-410 ml 0.1 N NaOH/l, total ash (1.3-3.4 g/l, total soluble ash (0.8-2.9 g/l, alkalinity of total ash (462.6-536.7, alkalinity of soluble ash (139.1-216.5, and lead number (4.5-4.6.

  8. Early work of N.G. (Dick) de Bruijn in analysis and some of my own

    NARCIS (Netherlands)

    Korevaar, J.

    2013-01-01

    There are parallels between de Bruijn’s early work in analysis and that of the author. However, Dick’s work soon became much broader and deeper. While the present paper reviews several topics of common interest, its main content is a short version of Dick’s important article related to Riemann’s Hyp

  9. Quantitative characterization of nonstructural carbohydrates of mezcal Agave (Agave salmiana Otto ex Salm-Dick).

    Science.gov (United States)

    Michel-Cuello, Christian; Juárez-Flores, Bertha Irene; Aguirre-Rivera, Juan Rogelio; Pinos-Rodríguez, Juan Manuel

    2008-07-23

    Fructans are the reserve carbohydrates in Agave spp. plants. In mezcal factories, fructans undergoes thermal hydrolysis to release fructose and glucose, which are the basis to produce this spirit. Carbohydrate content determines the yield of the final product, which depends on plant organ, ripeness stage, and thermal hydrolysis. Thus, a qualitative and quantitative characterization of nonstructural carbohydrates was conducted in raw and hydrolyzed juices extracted from Agave salmiana stems and leaves under three ripeness stages. By high-performance liquid chromatography (HPLC), fructose, glucose, sucrose, xylose, and maltose were identified in agave juice. Only the plant fraction with hydrolysis interaction was found to be significant in the glucose concentration plant. Interactions of the fraction with hydrolysis and ripeness with hydrolysis were statistically significant in fructose concentration. Fructose concentration rose considerably with hydrolysis, but only in juice extracted from ripe agave stems (early mature and castrated). This increase was statistically significant only with acid hydrolysis.

  10. Reconstruction of new holographic scalar field models of dark energy in Brans-Dicke Universe

    CERN Document Server

    Yang, Weiqiang; Song, Limin; Su, Yangyang; Li, Jian; Zhang, Dandan; Wang, Xiaogang

    2013-01-01

    Motivated by the work [K. Karami, J. Fehri, {{\\it Phys. Lett. B}} {\\bf 684}, 61 (2010)] and [A. Sheykhi, {{\\it Phys. Lett. B}} {\\bf 681}, 205 (2009)], we generalize their work to the new holographic dark energy model with $\\rho_D=\\frac{3\\phi^2}{4\\omega}(\\mu H^2+\

  11. Lamb-Dicke spectroscopy of atoms in a hollow-core photonic crystal fibre

    Science.gov (United States)

    Okaba, Shoichi; Takano, Tetsushi; Benabid, Fetah; Bradley, Tom; Vincetti, Luca; Maizelis, Zakhar; Yampol'skii, Valery; Nori, Franco; Katori, Hidetoshi

    2014-01-01

    Unlike photons, which are conveniently handled by mirrors and optical fibres without loss of coherence, atoms lose their coherence via atom–atom and atom–wall interactions. This decoherence of atoms deteriorates the performance of atomic clocks and magnetometers, and also hinders their miniaturization. Here we report a novel platform for precision spectroscopy. Ultracold strontium atoms inside a kagome-lattice hollow-core photonic crystal fibre are transversely confined by an optical lattice to prevent atoms from interacting with the fibre wall. By confining at most one atom in each lattice site, to avoid atom–atom interactions and Doppler effect, a 7.8-kHz-wide spectrum is observed for the 1S0−3P1(m=0) transition. Atoms singly trapped in a magic lattice in hollow-core photonic crystal fibres improve the optical depth while preserving atomic coherence time. PMID:24934478

  12. The Constructive Marginal of "Moby-Dick": Ishmael and the Developmental Model of Intercultural Sensitivity

    Science.gov (United States)

    Morgan, Jeff

    2011-01-01

    Cultural sensitivity theory is the study of how individuals relate to cultural difference. Using literature to help students prepare for study abroad, instructors could analyze character and trace behavior through a model of cultural sensitivity. Milton J. Bennett has developed such an instrument, The Developmental Model of Intercultural…

  13. ANALYSIS OF A DIFFERENTIATED APPROACH TO THE APPOINTMENT OF DICK METHODS IN BIOFEEDBACK CORRECTION AUTONOMIC DYSFUNCTION

    Directory of Open Access Journals (Sweden)

    A. G. Polyakova

    2013-01-01

    Full Text Available Goal of research: analysis of the effectiveness of Biofeedback therapy is differentiated depending on the clinical forms of autonomic dysfunction. Exchange rate control efficacy of biofeedback hardware was conducted on the dynamics of clinical andl aboratory data, surveys and assessment of the functional State of the SNC using heart rate variability, vegetative resonance test, Kerdo index definition, as well as èlektrokardiografiče applications and questionnaires, characterizing the State of psychoemotional sphere (Spilbergera–Hanina, test, Luscher. Laboratory tests include a complete blood count with evaluation of Adaptive reactions of the organism. The results of the rehabilitation complex of the patients with the use of biofeedback have confirmed its effectiveness.

  14. BKR 27(1) pp. xx-xx (Dick et al)

    African Journals Online (AJOL)

    Femi J. Olorunniji

    1Department of Science Laboratory Technology, School of Science, Rivers State College of Arts and ... from the water showed high sensitivity to oflaxicin, nalidixic acid and nitrofurantoin and high resistance ..... Nucleic Acids Research 7:.

  15. Soli o accompagnati. Riflessioni da uno sportello pubblico (passando per Philip K. Dick

    Directory of Open Access Journals (Sweden)

    Nicola Messina

    2006-12-01

    Full Text Available Nell'attimo in cui il mio cervello percepì la consistenza del viale su cui ero uscito, preso da sconforto, misi a fuoco l'idea dell'esistenza di uno spazio temporale. La conoscenza/comprensione di altre entità: questo sta alla base della differenza tra essere soli o accompagnati.

  16. Transitivity and Characterization:Analysis on Dick in Tender is The Night

    Institute of Scientific and Technical Information of China (English)

    陈云娇; 郭继东

    2015-01-01

    <正>1.Introduction to Transitivity System According to Halliday,three meta-functions of language are al are reflected by means of subsystem of language.And in English,the form of expression of three meta-functions are(1)Transitivity System;(2)Mood System,Modality System;(3)Thematic System,Information System and Cohesion.[1

  17. Lamb-Dicke spectroscopy of atoms in a hollow-core photonic crystal fibre

    Science.gov (United States)

    Okaba, Shoichi; Takano, Tetsushi; Benabid, Fetah; Bradley, Tom; Vincetti, Luca; Maizelis, Zakhar; Yampol'Skii, Valery; Nori, Franco; Katori, Hidetoshi

    2014-06-01

    Unlike photons, which are conveniently handled by mirrors and optical fibres without loss of coherence, atoms lose their coherence via atom-atom and atom-wall interactions. This decoherence of atoms deteriorates the performance of atomic clocks and magnetometers, and also hinders their miniaturization. Here we report a novel platform for precision spectroscopy. Ultracold strontium atoms inside a kagome-lattice hollow-core photonic crystal fibre are transversely confined by an optical lattice to prevent atoms from interacting with the fibre wall. By confining at most one atom in each lattice site, to avoid atom-atom interactions and Doppler effect, a 7.8-kHz-wide spectrum is observed for the 1S0-3P1(m=0) transition. Atoms singly trapped in a magic lattice in hollow-core photonic crystal fibres improve the optical depth while preserving atomic coherence time.

  18. Lamb-Dicke spectroscopy of atoms in a hollow-core photonic crystal fibre

    CERN Document Server

    Okaba, Shoichi; Benabid, Fetah; Bradley, Tom; Vincetti, Luca; Maizelis, Zakhar; Yampol'skii, Valery; Nori, Franco; Katori, Hidetoshi

    2014-01-01

    Unlike photons, which are conveniently handled by mirrors and optical fibres without loss of coherence, atoms lose their coherence via atom-atom and atom-wall interactions. This decoherence of atoms deteriorates the performance of atomic clocks and magnetometers, and also hinders their miniaturisation. Here we report a novel platform for precision spectroscopy. Ultracold strontium atoms inside a kKagome-lattice hollow-core photonic crystal fibre (HC-PCF) are transversely confined by an optical lattice to prevent atoms from interacting with the fibre wall. By confining at most one atom in each lattice site, to avoid atom-atom interactions and Doppler effect, a 7.8-kHz-wide spectrum is observed for the $^1 S_0-{}^3P_1$ (m=0) transition. Atoms singly trapped in a magic lattice in hollow-core photonic crystal fibresHC-PCFs improve the optical depth while preserving atomic coherence time.

  19. Non-Linearly Interacting Ghost Dark Energy in Brans-Dicke Cosmology

    CERN Document Server

    Ebrahimi, E

    2016-01-01

    In this paper we extend the form of interaction term into the non-linear regime in the ghost dark energy model. A general form of non-linear interaction term is presented and cosmic dynamic equations are obtained. Next, the model is detailed for two special choice of the non-linear interaction term. According to this the universe transits at suitable time ($z\\sim 0.8$) from deceleration to acceleration phase which alleviate the coincidence problem. Squared sound speed analysis revealed that for one class of non-linear interaction term $v_s^2$ can gets positive. This point is an impact of the non-linear interaction term and we never find such behavior in non interacting and linearly interacting ghost dark energy models. Also statefinder parameters are introduced for this model and we found that for one class the model meets the $\\Lambda CDM$ while in the second choice although the model approaches the $\\Lambda CDM$ but never touch that.

  20. Punishment of Nature——An Ecocritical Study of Moby Dick

    Institute of Scientific and Technical Information of China (English)

    赵丽莉

    2015-01-01

    This essay is to analyze and study human's encroachment and despisement on nature from the perspective of ecocriticism.Ishmael,as the implied narrator,witnesses the human's exploitation on nature.The evil consequences are brought by anthropocentrism and people who exploit nature receive severely punishment somatically and spiritually.

  1. Punishment of Nature——An Ecocritical Study of Moby Dick

    Institute of Scientific and Technical Information of China (English)

    赵丽莉

    2015-01-01

    This essay is to analyze and study human’s encroachment and despisement on nature from the perspective of ecocriticism.Ishmael,as the implied narrator,witnesses the human’s exploitation on nature.The evil consequences are brought by anthropocentrism and people who exploit nature receive severely punishment somatically and spiritually.

  2. Lamb-Dicke spectroscopy of atoms in a hollow-core photonic crystal fibre.

    Science.gov (United States)

    Okaba, Shoichi; Takano, Tetsushi; Benabid, Fetah; Bradley, Tom; Vincetti, Luca; Maizelis, Zakhar; Yampol'skii, Valery; Nori, Franco; Katori, Hidetoshi

    2014-06-17

    Unlike photons, which are conveniently handled by mirrors and optical fibres without loss of coherence, atoms lose their coherence via atom-atom and atom-wall interactions. This decoherence of atoms deteriorates the performance of atomic clocks and magnetometers, and also hinders their miniaturization. Here we report a novel platform for precision spectroscopy. Ultracold strontium atoms inside a kagome-lattice hollow-core photonic crystal fibre are transversely confined by an optical lattice to prevent atoms from interacting with the fibre wall. By confining at most one atom in each lattice site, to avoid atom-atom interactions and Doppler effect, a 7.8-kHz-wide spectrum is observed for the (1)S0-(3)P1(m=0) transition. Atoms singly trapped in a magic lattice in hollow-core photonic crystal fibres improve the optical depth while preserving atomic coherence time.

  3. Do Cyborg Dreams Emancipate Sheep? (with Apologies to Philip K. Dick).

    Science.gov (United States)

    Bromley, Hank

    A full investigation into how and why the expression of potential benefits of computers in schools is hindered would need to consider many aspects, but one point that should be considered is the ever-tightening integration of educational institutions into the global economy. Evidence of the accelerating assimilation of schools into the economy…

  4. "Dicks are for Chicks": Latino Boys, Masculinity, and the Abjection of Homosexuality

    Science.gov (United States)

    Mora, Richard

    2013-01-01

    Employing social constructivist theories and the concept of abjection from gender studies, this article examines how and why a group of low-income, USA-born Dominican and Puerto Rican middle-school boys constructed masculine identities by invoking and repudiating homosexuality. Ethnographic data from a 2.5-year study indicate that the abjection of…

  5. Chasing Moby Dick Across Every Sea and Ocean? Contextual Choices in Fighting Corruption

    DEFF Research Database (Denmark)

    Mungiu-Pippidi, Alina; Jensen, Mette Frisk

    2011-01-01

    Draft report commissioned by Norad, c/o ANKOR (the Anti-corruption Project) in cooperation with the Evaluation Department ("Contextual Choices for Results in Fighting Corruption", Referende number 1001232)...

  6. Mortal Imperfection: The Revenge of the Social Animal in "Heart of Darkness" and "Moby Dick"

    Science.gov (United States)

    Sumbal, Maqsood

    2014-01-01

    This paper seeks to explore and peek into the psychological hell of the so-called superior beings who, in their megalomaniacal intentions make the world a difficult place to live for some groups based on ethnicity, culture, race, religion, and other differences. It looks into the duplicity and double standards of people and the way they exploit a…

  7. Reading in a Participatory Culture: Remixing "Moby-Dick" in the English Classroom

    Science.gov (United States)

    Jenkins, Henry, Ed.; Kelley, Wyn, Ed.

    2013-01-01

    Building on the groundbreaking research of the MacArthur Foundation's Digital Media & Learning initiative, this book crosses the divide between digital literacies and traditional print culture to engage a generation of students who can read with a book in one hand and a mouse in the other. "Reading in a Participatory Culture" tells the story of an…

  8. Territorial Disputes in the South China Sea: Navigating Rough Waters, Jing Huang and Andrew Billo, eds.

    OpenAIRE

    Le Failler, Philippe

    2016-01-01

    Rassemblant les actes d’une conférence tenue en mars 2013 à Singapour au sein de la Lee Kuan Yew School of Public Policy, cet ouvrage permet de faire le point sur les enjeux du litige territorial de la mer de Chine du Sud. Très équilibré quant à la nationalité de ses intervenants, une dizaine de spécialistes des questions de défense, de droit et des relations internationales, cet ouvrage précieux (68£), pose la question en quatre chapitres : origines de la question – dimension juridique – rôl...

  9. H10235: NOS Hydrographic Survey , St. Andrew Bay, Florida, 1988-03-08

    Data.gov (United States)

    National Oceanic and Atmospheric Administration, Department of Commerce — The National Oceanic and Atmospheric Administration (NOAA) has the statutory mandate to collect hydrographic data in support of nautical chart compilation for safe...

  10. H10237: NOS Hydrographic Survey , St. Andrew Bay, Florida, 1987-05-07

    Data.gov (United States)

    National Oceanic and Atmospheric Administration, Department of Commerce — The National Oceanic and Atmospheric Administration (NOAA) has the statutory mandate to collect hydrographic data in support of nautical chart compilation for safe...

  11. H10260: NOS Hydrographic Survey , St. Andrews Bay, Florida, 1988-04-27

    Data.gov (United States)

    National Oceanic and Atmospheric Administration, Department of Commerce — The National Oceanic and Atmospheric Administration (NOAA) has the statutory mandate to collect hydrographic data in support of nautical chart compilation for safe...

  12. H10170: NOS Hydrographic Survey , St. Andrew Bay, 1985-05-07

    Data.gov (United States)

    National Oceanic and Atmospheric Administration, Department of Commerce — The National Oceanic and Atmospheric Administration (NOAA) has the statutory mandate to collect hydrographic data in support of nautical chart compilation for safe...

  13. Pepsi kerkib Coca-Cola varjust / Andrew Ward ; tõlk. Erik Aru

    Index Scriptorium Estoniae

    Ward, Andrew

    2005-01-01

    Firma PepsiCo edust viimastel aastatel. Autori sõnul on suurim firma ees seisev väljakutse Põhja-Ameerika ja Lääne-Euroopa tarbija üha kasvav mure ülekaalu pärast, firma juht Steve Reinemund näeb selles firmale pigem võimalusi kui ohtu. Firma on USA-s kasutusele võtnud märgisüsteemi, et näidata, millised tooted on tervislikumad. Diagrammid: Kasumiallikad; Turuliidrid. Lisa: Vastasseis

  14. H10259: NOS Hydrographic Survey , St. Andrews Bay, Florida, 1989-04-26

    Data.gov (United States)

    National Oceanic and Atmospheric Administration, Department of Commerce — The National Oceanic and Atmospheric Administration (NOAA) has the statutory mandate to collect hydrographic data in support of nautical chart compilation for safe...

  15. Seize the Day:Awareness of Time in You, Andrew Marvell

    Institute of Scientific and Technical Information of China (English)

    龚园媛

    2013-01-01

    Based on the alternation of scenes, awareness of time is analyzed from three perspectives. The common one is to be aware of time flow in the change of scenes. The outstanding ones include the psychological and philosophical perception of time. Being aware of the temporality of life, the individual need to take an open and unforced attitude toward death —“carpe diem!”.

  16. The harmonization of the avoidance rules in European Union insolvencies / Andrew Keay

    Index Scriptorium Estoniae

    Keay, Andrew

    2017-01-01

    Piiriülestest tehingutest ja sellest tulenevatest probleemidest piiriülestes kohtumenetlustes, õiguse kohaldamise probleemidest piiriüleste tehingute korral. Piiriülestest maksejõuetusmenetlustest Euroopa Liidus

  17. Pärt, Arvo. Cantus in memory of Benjamin Britten / Andrew Achenbach

    Index Scriptorium Estoniae

    Achenbach, Andrew

    1995-01-01

    Uuest heliplaadist "Pärt, Arvo. Cantus in memory of Benjamin Britten. BBC Northern Symphony Orchestra / Norman del Mar; BBC Symphony Orchestra / Gennady Rozhdestvensky". BBC Radio Classics CD BBCRD 9129 (71 minutes)

  18. Pärt, Arvo. Cantus in memory of Benjamin Britten / Andrew Achenbach

    Index Scriptorium Estoniae

    Achenbach, Andrew

    1995-01-01

    Uuest heliplaadist "Pärt, Arvo. Cantus in memory of Benjamin Britten. BBC Northern Symphony Orchestra / Norman del Mar; BBC Symphony Orchestra / Gennady Rozhdestvensky". BBC Radio Classics CD BBCRD 9129 (71 minutes)

  19. Environmental Assessment for the Upgrade of the Andrews Air Force Base Airfield Security System

    Science.gov (United States)

    2004-11-01

    Russian olive ( Elaeagnus angustifolia ), beggar-ticks (Bidens polylepis), tall fescue (Festuca elatior), purple loosestrife (Lythrum salicaria...wineberry (Rubus phoenicolasius), tree-of-heaven (Ailanthus altissima), oriental bittersweet (Celastrus orbiculatus), autumn olive ( Elaeagnus umbellata

  20. Kuus turundusüksuse tüüpi / Edward Landry, Andrew Tipping, Brodie Dixon

    Index Scriptorium Estoniae

    Landry, Edward

    2005-01-01

    Konsultatsioonifirma Booz Allen Hamilton ja Association of National Advertisers välja töötatud turundusüksuste tüüpidest ja asjaoludest, mida peaks arvesse võtma firma olemasoleva turundusüksuse välja selgitamiseks

  1. Kas sinu firma on oskuslikult üles ehitatud? / Michael Goold, Andrew Campbell

    Index Scriptorium Estoniae

    Goold, Michael

    2002-01-01

    Londoni Ashridge Strategic Management Centre-i direktorid kirjeldavad üheksat testi, millest juhil ettevõtte struktuuri loomisel kasu on - turu eeliste, emafirma eeliste, inimeste, teostatavuse, subkultuuride, raskete lülide, üleliigse hierarhia, vastutuse ning paindlikkuse test. Lisad: Kuidas emafirmad väärtusi loovad; Kuidas üksused suhtlevad; Probleemide kõrvaldamine

  2. Additional dates of Sir Andrew Smith's Illustrations of the Zoology of South Africa.

    Science.gov (United States)

    Low, Martyn E Y; Evenhuis, Neal L

    2014-05-14

    We update the collation of the dates of publication of Smith's Illustrations of the Zoology of South Africa provided by Waterhouse (1880) and Barnard (1950, 1952). In the case of nine parts, we are able to provide more accurate dates of publication (including day-dates for seven of these parts). For workers of invertebrate taxonomy, we provide an accurate date of publication for W. S. Macleay's volume on Annulosa. 

  3. Effects of light intensity on the morphology and CAM photosynthesis of Vanilla planifolia Andrews

    Directory of Open Access Journals (Sweden)

    María Claudia Díez

    2017-01-01

    Full Text Available Vanilla planifolia is a neotropical orchid, whose fruits produce the natural vanilla, a fundamental ingredient for the food and cosmetic industry. Because of its importance in the world market, it is cultivated in many tropical countries and recently its cultivation has started in Colombia. This species requires shade for its development; however, the optimal of light conditions are unknown. This work evaluates the effect of different light intensities on CAM photosynthesis, physiology, morphology, and growth of this species. For this, vanilla seedlings were subjected to four treatments of relative illumination (RI (T1=8%, T2=17%, T3=31% and T4=67%. Most CO2 assimilation occurred along night in all treatments, which confirms that vanilla is a strong CAM species. Plants grown under high lighting (67% RI had almost half of the photosynthesis in treatments of intermediate lighting (17 and 31%, which is consistent with the lower nocturnal acid accumulation in that treatment. Likewise, the photochemical efficiency of photosystem II (Fv / Fm showed that in plants of the 67% RI occurred high radiation stress. On the other hand, vanilla plants reached greater length, leaf area, and total biomass when grown under intermediate radiation (17 and 31% RI. These results suggest that high radiation alters the functioning of vanilla plants, inhibiting photosynthesis and growth, and that highly shaded environments not significantly affected the CAM photosynthesis of vanilla; however, in the long-term this species showed higher photosynthesis and growth under intermediate levels of radiation

  4. Review: Andrew Bennett & Jeffrey T. Checkel (Eds. (2015. Process Tracing: From Metaphor to Analytic Tool

    Directory of Open Access Journals (Sweden)

    Felix Anderl

    2015-09-01

    Full Text Available In this review, I argue that this textbook edited by BENNETT and CHECKEL is exceptionally valuable in at least four aspects. First, with regards to form, the editors provide a paragon of how an edited volume should look: well-connected articles "speak to" and build on each other. The contributors refer to and grapple with the theoretical framework of the editors who, in turn, give heed to the conclusions of the contributors. Second, the book is packed with examples from research practice. These are not only named but thoroughly discussed and evaluated for their methodological potential in all chapters. Third, the book aims at improving and popularizing process tracing, but does not shy away from systematically considering the potential weaknesses of the approach. Fourth, the book combines and bridges various approaches to (mostly qualitative methods and still manages to provide abstract and easily accessible standards for making "good" process tracing. As such, it is a must-read for scholars working with qualitative methods. However, BENNETT and CHECKEL struggle with fulfilling their promise of bridging positivist and interpretive approaches, for while they do indeed take the latter into account, their general research framework remains largely unchanged by these considerations. On these grounds, I argue that, especially for scholars in the positivist camp, the book can function as a "how-to" guide for designing and implementing research. Although this may not apply equally to interpretive researchers, the book is still a treasure chest for them, providing countless conceptual clarifications and potential pitfalls of process tracing practice. URN: http://nbn-resolving.de/urn:nbn:de:0114-fqs1503187

  5. Abitane diterpenoids isolation from Plectranthus barbatus; Diterpenos tipo abietano isolados de Plectranthus barbatus Andrews

    Energy Technology Data Exchange (ETDEWEB)

    Albuquerque, Roberto L. de; Kentopff, Marta R.; Machado, Maria Iracema L.; Silva, Maria Goretti V.; Matos, Francisco Jose de A. [Universidade Federal do Ceara (UFC), Fortaleza, CE (Brazil). Dept. de Quimica Analitica e Fisico-Quimica; Morais, Selene M. [Universidade Federal do Ceara (UFC), Fortaleza, CE (Brazil); Braz-Filho, Raimundo [Universidade Estadual do Norte Fluminense (UENF), Campos dos Goytacazes, RJ (Brazil). Centro de Ciencia e Tecnologia. Setor de Quimica de Produtos Naturais]. E-mail: braz@uenf.br

    2007-07-01

    Plectranthus barbatus is largely used in the Northeast region of Brazil by the local population for treatment of digestive problems as substitute of boldo (Pneumus boldus). Phytochemical analysis of the leaf extracts of Plectranthus barbatus (Labiatae) cultivated in this region yielded two abietane diterpenoids, cyclobubatusin (1) and barbatusin (2) and a new one named 7beta-acetyl-12-deacetoxycyclobutatusin (3). The structures of the isolated compounds were established by spectral analysis, using mainly mass spectra and {sup 1}H and {sup 13}CNMR (1D and 2D). These procedures permitted the assignment of all chemical shifts in the diterpenoids. (author)

  6. Estonia still keen on single currency / Andrew Ward, Peter Spiegel, Joshua Chaffin

    Index Scriptorium Estoniae

    Ward, Andrew

    2010-01-01

    Eesti üleminekust eurole. President Toomas Hendrik Ilvese sõnul kõnnib Eesti teiste väiksemate põhjamaiste riikide jälgedes. Tema sõnul on väikese riigi ainus võimalus ellujäämiseks reeglite järgimine ning nõudmine, et ka teised seda teeksid

  7. Andrew Milner, ed., Tenses of Imagination: Raymond Williams on Science Fiction, Utopia and Dystopia.

    Directory of Open Access Journals (Sweden)

    Antonis Balasopoulos

    2011-03-01

    Full Text Available Tenses of Imagination, an anthology of Raymond Williams’s writings on science fiction, utopia and dystopia is the seventh volume in the growing Ralahine Utopian Studies Series. It is also, in my view, something of a treasure. For it not only offers an illuminating compendium of Williams’s most important engagements, critical and creative, with SF, utopia and dystopia, but also furnishes us with a heretofore unavailable account of the long-term significance of these frequently spurned genres a...

  8. Andrew Milner, ed., Tenses of Imagination: Raymond Williams on Science Fiction, Utopia and Dystopia.

    OpenAIRE

    Antonis Balasopoulos

    2011-01-01

    Tenses of Imagination, an anthology of Raymond Williams’s writings on science fiction, utopia and dystopia is the seventh volume in the growing Ralahine Utopian Studies Series. It is also, in my view, something of a treasure. For it not only offers an illuminating compendium of Williams’s most important engagements, critical and creative, with SF, utopia and dystopia, but also furnishes us with a heretofore unavailable account of the long-term significance of these frequently spurned genres a...

  9. Surprising similarities: Recent monetary regimes of small economies / Andrew K. Rose

    Index Scriptorium Estoniae

    Rose, Andrew K.

    2014-01-01

    Artikkel keskendub väikese majandusega riikide (sh Eesti) rahapoliitikale enne ja pärast ülemaailmset finantskriisi. Kokku analüüsitakse 170 riigi näitajaid aastatest 2007-2012 ning jõutakse järeldusele, et riikide rahapoliitika mõju makromajanduslikele ja finantstagajärgedele on tegelikult üllatavalt väike

  10. Kas sinu firma on oskuslikult üles ehitatud? / Michael Goold, Andrew Campbell

    Index Scriptorium Estoniae

    Goold, Michael

    2002-01-01

    Londoni Ashridge Strategic Management Centre-i direktorid kirjeldavad üheksat testi, millest juhil ettevõtte struktuuri loomisel kasu on - turu eeliste, emafirma eeliste, inimeste, teostatavuse, subkultuuride, raskete lülide, üleliigse hierarhia, vastutuse ning paindlikkuse test. Lisad: Kuidas emafirmad väärtusi loovad; Kuidas üksused suhtlevad; Probleemide kõrvaldamine

  11. Casting Net Assessment: Andrew W. Marshall and the Epistemic Community of the Cold War

    Science.gov (United States)

    2015-02-01

    Marschak’s directorship, which be- gan in 1943. A Kiev-born Russian exile, Marschak was “inquisitive, unpreten- tious, perceptive , and persistent yet...the Kremlin design and hasten the decay of the Soviet system.”32 The outbreak of the Korean conflict—shortly after Marshall’s arrival—tested this...friend jokingly described their frequenting of California’s best restaurants as a “multi-year quest for gastro- nomic ecstasy.”47 But they shared a

  12. Retrieving an archive: Brook Andrew and William Blandowski’s Australien in 142 Photographischen Abbildungen

    OpenAIRE

    Kerry Heckenberg

    2014-01-01

    Much of the critical response to Brook Andrew’s reinterpretation of images from a colonial archive in his 2008 series The Island situated the work in a tradition of post-colonial critique of documentary images. But is this an adequate account of either Andrew’s work or the archive in question, William Blandowski’s Australien in 142 Photographischen Abbildungen (1862)? This essay looks at practices involving copying and their impact on understandings of authenticity, the role of art in science...

  13. Retrieving an archive: Brook Andrew and William Blandowski’s Australien in 142 Photographischen Abbildungen

    Directory of Open Access Journals (Sweden)

    Kerry Heckenberg

    2014-12-01

    Full Text Available Much of the critical response to Brook Andrew’s reinterpretation of images from a colonial archive in his 2008 series The Island situated the work in a tradition of post-colonial critique of documentary images. But is this an adequate account of either Andrew’s work or the archive in question, William Blandowski’s Australien in 142 Photographischen Abbildungen (1862? This essay looks at practices involving copying and their impact on understandings of authenticity, the role of art in science, the nature of the observer and visual communication in relation to the broad scope of Blandowski’s archive, but particularly with regard to Andrew’s intervention in it. By examining the way that the past is brought into the present in the Island series, this essay seeks to facilitate a more richly nuanced understanding of these works that is cognizant of the historical issues involved.

  14. Environmental Assessment for Aerial Application of Pesticide for Gypsy Moth Control, Andrews Air Force Base, Maryland

    Science.gov (United States)

    2008-04-01

    a cessation of feeding, and death by starvation. Btk is persistent on foliage for about 7-10 days. Btk formulations are available as flowable ...applicator’s certification. COMPOSITION Active Ingredient: (% by weight) diflubenzuron N-[[(4-Chlorophenyl)amino]carbonyl]-2,6-difluorobenzamide

  15. 75 FR 10457 - Andrew Pickens Ranger District; South Carolina; AP Loblolly Pine Removal and Restoration Project

    Science.gov (United States)

    2010-03-08

    ... overstory trees would be left as reserves in most units. This would result in a two-aged structure to most... designed by Forest Service engineers to specific standards that include designing drainage structures such as culvert installations, inside slope ditching, road crown specifications, widened...

  16. 77 FR 59163 - Andrew Pickens Ranger District; South Carolina; AP Loblolly Pine Removal and Restoration Project

    Science.gov (United States)

    2012-09-26

    ... structures such as culvert installations, inside slope ditching, road crown specifications, widened turn... structure in some stands. ] Woodland Treatments (202 Acres) The woodland treatments would cut all...

  17. H10236: NOS Hydrographic Survey , St. Andrew Bay, Florida, 1987-05-05

    Data.gov (United States)

    National Oceanic and Atmospheric Administration, Department of Commerce — The National Oceanic and Atmospheric Administration (NOAA) has the statutory mandate to collect hydrographic data in support of nautical chart compilation for safe...

  18. Graafika, graafika! / Jan Kenneth Weckman, Sue Gollifer, Andrew Atkinson...[jt.] ; interv. Kaisa Puustak, Ando Pajus

    Index Scriptorium Estoniae

    2001-01-01

    II rahvusvahelisest vabagraafika konverentsist "Impact" Helsingis 29. VIII-2. IX. Tutvuti ka Tallinnas eesti graafikute loominguga, Tallinna Graafikakoja ja Tallinna XII graafikatriennaaliga. Eesti ja euroopa graafikast, Tallinna graafikatriennaalist

  19. Fremantle Media ekspordib seriaale kogu maailma / Andrew Edgecliffe-Johnson ; tõlk. Erik Aru

    Index Scriptorium Estoniae

    Edgecliffe-Johnson, Andrew

    2007-01-01

    Teleproduktsioonifirmast Fremantle Media. Saateformaatide eksportimisel saavutatud edu teeb firmast õpikunäite, kuidas viia tooteid üle maailma, muutes neid just piisavalt, et sobida kohaliku maitsega, jäädes samas truuks algideele. Edu ei vaja tõlget

  20. BBC rajab üleilmset internetibrändi / Andrew Edgecliffe-Johnson

    Index Scriptorium Estoniae

    Edgecliffe-Johnson, Andrew

    2006-01-01

    Suurbritannias on riik mitte ainult toetanud, vaid ka nõudnud BBC kujunemist Suurbritannia tugevaimaks kodumaiseks internetibrändiks. BBC võrguväljaande kasvust. Tabel: Maailma populaarseimad uudisteportaalid jaanuaris 2006