cometadata/datacite-rtg-text-other-reclassification-records huggingface dataset:
Digital Metamaterials
Creators: name: Della Giovampaola, Cristian
name: Engheta, Nader
Publisher: name: arXiv
Year: 2014
Subjects: subject: Materials Science (cond-mat.mtrl-sci)
subject: Optics (physics.optics)
subject: FOS: Physical sciences

description: Balancing the complexity and the simplicity has played an important role in the development of many fields in science and engineering. As Albert Einstein was once quoted to say: 'Everything must be made as simple as possible, but not one bit simpler'. The simplicity of an idea brings versatility of that idea into a broader domain, while its complexity describes the foundation upon which the idea stands. One of the well-known and powerful examples of such balance is in the Boolean algebra and its impact on the birth of digital electronics and digital information age. The simplicity of using only two numbers of '0' and '1' in describing an arbitrary quantity made the fields of digital electronics and digital signal processing powerful and ubiquitous. Here, inspired by the simplicity of digital electrical systems we propose to apply an analogous idea to the field of metamaterials, namely, to develop the notion of digital metamaterials. Specifically, we investigate how one can synthesize an electromagnetic metamaterial with desired materials parameters, e.g., with a desired permittivity, using only two elemental materials, which we call 'metamaterial bits' with two distinct permittivity functions, as building blocks. We demonstrate, analytically and numerically, how proper spatial mixtures of such metamaterial bits leads to 'metamaterial bytes' with material parameters different from the parameters of metamaterial bits. We also explore the role of relative spatial orders of such digital materials bits in constructing different parameters for the digital material bytes. We then apply this methodology to several design examples such as flat graded-index digital lens, cylindrical scatterers, digital constructs for epsilon-near-zero (ENZ) supercoupling, and digital hyperlens, highlighting the power and simplicity of this methodology and algorithm.
Crystal field splitting in Sr$_{n+1}$Ir$_n$O$_{3n+1}$ ($n$ = 1, 2) iridates probed by x-ray Raman spectroscopy
Creators: name: Sala, M. Moretti
name: Rossi, M.
name: Al-Zein, A.
name: Boseggia, S.
name: Hunter, E. C.
name: Perry, R. S.
name: Prabhakaran, D.
name: Boothroyd, A. T.
name: Brookes, N. B.
name: McMorrow, D. F.
name: Monaco, G.
name: Krisch, M.
Publisher: name: arXiv
Year: 2014
Subjects: subject: Strongly Correlated Electrons (cond-mat.str-el)
subject: FOS: Physical sciences

description: Non-resonant Raman spectroscopy in the hard X-ray regime has been used to explore the electronic structure of the first two members of the Ruddlesden-Popper series Sr$_{n+1}$Ir$_n$O$_{3n+1}$ of iridates. By tuning the photon energy transfer around 530 eV we have been able to explore the oxygen K near edge structure with bulk sensitivity. The angular dependence of the spectra has been exploited to assign features in the 528-535 eV energy range to specific transitions involving the Ir 5d orbitals. This has allowed us to extract reliable values for both the t2g-eg splitting arising from the cubic component of the crystal field (10Dq), in addition to the splitting of the eg orbitals due to tetragonal distortions. The values we obtain are (3.8, 1.6) eV and (3.55, 1.9) eV for Sr$_2$IrO$_4$ and Sr$_3$Ir$_2$O$_7$, respectively.
description: 6 pages, 4 figures, 2 tables
Thought Experiments on Gravitational Forces
Creators: name: Lynden-Bell, Donald
name: Katz, Joseph
Publisher: name: arXiv
Year: 2013
Subjects: subject: Cosmology and Nongalactic Astrophysics (astro-ph.CO)
subject: General Relativity and Quantum Cosmology (gr-qc)
subject: FOS: Physical sciences

description: Large contributions to the near closure of the Universe and to the acceleration of its expansion are due to the gravitation of components of the stress-energy tensor other than its mass density. To familiarise astronomers with the gravitation of these components we conduct thought experiments on gravity, analogous to the real experiments that our forebears conducted on electricity. By analogy to the forces due to electric currents we investigate the gravitational forces due to the flows of momentum, angular momentum, and energy along a cylinder. Under tension the gravity of the cylinder decreases but the 'closure' of the 3-space around it increases. When the cylinder carries a torque the flow of angular momentum along it leads to a novel helical interpretation of Levi-Civita's external metric and a novel relativistic effect. Energy currents give gravomagnetic effects in which parallel currents repel and antiparallel currents attract, though such effects must be added to those of static gravity. The gravity of beams of light give striking illustrations of these effects and a re-derivation of light bending via the gravity of the light itself. Faraday's experiments lead us to discuss lines of force of both gravomagnetic and gravity fields. A serious conundrum arrises if Landau and Lifshitz's definition of Gravitational force is adopted.
description: 16 pages, 7 figures
The lingering anomalous secular increase of the eccentricity of the orbit of the Moon: further attempts of explanation of cosmological origin
Creators: name: Iorio, Lorenzo
Publisher: name: arXiv
Year: 2014
Subjects: subject: General Relativity and Quantum Cosmology (gr-qc)
subject: Earth and Planetary Astrophysics (astro-ph.EP)
subject: Geophysics (physics.geo-ph)
subject: Space Physics (physics.space-ph)
subject: FOS: Physical sciences

description: A new analysis of extended data records collected with the Lunar Laser Ranging (LLR) technique performed with improved tidal models was not able to resolve the issue of the anomalous rate $\dot e$ of the eccentricity $e$ of the orbit of the Moon, which is still in place with a magnitude of $\dot e=(5\pm 2)\times 10^{-12}$ yr$^{-1}$. Some possible cosmological explanations are offered in terms of the post-Newtonian effects of the cosmological expansion, and of the slow temporal variation of the relative acceleration rate $\ddot{S} S^{-1}$ of the cosmic scale factor $S$. None of them is successful since their predicted secular rates of the lunar eccentricity are too small by several orders of magnitude.
description: LaTex2e, 4 pages, no figures, no tables. Accepted for publication in Galaxies
Almost overcomplete and almost overtotal sequences in Banach spaces
Creators: name: Fonf, Vladimir P.
name: Zanco, Clemente
Publisher: name: arXiv
Year: 2014
Subjects: subject: Functional Analysis (math.FA)
subject: FOS: Mathematics
subject: 46B20, 46B50, 46B45

description: The new concepts are introduced of almost overcomplete sequence in a Banach space and almost overtotal sequence in a dual space. We prove that any of such sequences is relatively norm-compact and we obtain several applications of this fact.
Adaptive timestep control for nonstationary solutions of the Euler equations
Creators: name: Steiner, Christina
name: Müller, Siegfried
name: Noelle, Sebastian
Publisher: name: arXiv
Year: 2014
Subjects: subject: Numerical Analysis (math.NA)
subject: FOS: Mathematics

description: In this paper we continue our work on adaptive timestep control for weakly non- stationary problems. The core of the method is a space-time splitting of adjoint error representations for target functionals due to Süli and Hartmann. The main new ingredients are (i) the extension from scalar, 1D, conservation laws to the 2D Euler equations of gas dynamics, (ii) the derivation of boundary conditions for a new formulation of the adjoint problem and (iii) the coupling of the adaptive time-stepping with spatial adaptation. For the spatial adaptation, we use a multiresolution-based strategy developed by Müller, and we combine this with an implicit time discretization. The combined space-time adaptive method provides an efficient choice of timesteps for implicit computations of weakly nonstationary flows. The timestep will be very large in time intervalls of stationary flow, and becomes small when a perturbation enters the flow field. The efficiency of the solver is investigated by means of an unsteady inviscid 2D flow over a bump.
description: arXiv admin note: substantial text overlap with arXiv:1404.4503
Access Policies for Native American Archival Materials in the National Anthropological Archives, Smithsonian Institution
Creators: name: Marsh, Diana E.
name: Leopold, Robert
name: Crowe, Katherine
name: Madison, Katherine S.
Publisher: name: Society of American Archivists
Year: 2020
Subjects: archives
Native American
Indigenous
access
ethics
data
museum
repatriation
knowledge sharing
decolonizing methodologies
colonial
anthropology
archaeology
collections
privacy
cultural sensitivity
protocols

description: This case study contributes to the history of collections access protocols by examining one repository’s policies and practices over a fifty-year period— those of the National Anthropological Archives at the Smithsonian Institution’s National Museum of Natural History. It describes a series of archival programs and projects that occurred before, during, and after the development of the Protocols for Native American Archival Materials in order to view changes in the archives’ access policies within a broader cultural and institutional milieu, presenting a more complex narrative than previously available. The case study assesses the influence of the Protocols as well as some challenges to the adoption of several recommendations. Finally, we make several proposals for archival repositories with comparable collections and constituencies.
THE EFFECTS OF SHOCKS TO ETHIOPIAN MONETARY POLICY ON PRICE AND OUTPUT: SVAR APPROACH
Creators: name: ANTENEH GEREMEW
Publisher: name: Zenodo
Year: 2014

description: The Effects of Shocks to Ethiopian Monetary Policy on Price and Output: SVAR Approach Anteneh Geremew Addis Ababa University, June 2014 The main objective of this paper was to model and investigate the effect of shocks on Ethiopian monetary policy in to output and price using SVAR methodology. Using quarterly data 1995Q3 to 2011/12Q4, SVAR model is developed. Both the domestic (GDP, CPI, M0, T-bill rate) and foreign variables (OPI and WCPI) were used to investigate the Ethiopian monetary policy framework. I have imposed a contemporaneous restriction based on economic theory in order to provide some economic structure to Ethiopia SVAR.
Automatic large-scale classification of bird sounds is strongly improved by unsupervised feature learning
Creators: name: Stowell, Dan
name: Plumbley, Mark D.
Publisher: name: arXiv
Year: 2014
Subjects: subject: Sound (cs.SD)
subject: Machine Learning (cs.LG)
subject: FOS: Computer and information sciences

description: Automatic species classification of birds from their sound is a computational tool of increasing importance in ecology, conservation monitoring and vocal communication studies. To make classification useful in practice, it is crucial to improve its accuracy while ensuring that it can run at big data scales. Many approaches use acoustic measures based on spectrogram-type data, such as the Mel-frequency cepstral coefficient (MFCC) features which represent a manually-designed summary of spectral information. However, recent work in machine learning has demonstrated that features learnt automatically from data can often outperform manually-designed feature transforms. Feature learning can be performed at large scale and "unsupervised", meaning it requires no manual data labelling, yet it can improve performance on "supervised" tasks such as classification. In this work we introduce a technique for feature learning from large volumes of bird sound recordings, inspired by techniques that have proven useful in other domains. We experimentally compare twelve different feature representations derived from the Mel spectrum (of which six use this technique), using four large and diverse databases of bird vocalisations, with a random forest classifier. We demonstrate that MFCCs are of limited power in this context, leading to worse performance than the raw Mel spectral data. Conversely, we demonstrate that unsupervised feature learning provides a substantial boost over MFCCs and Mel spectra without adding computational complexity after the model has been trained. The boost is particularly notable for single-label classification tasks at large scale. The spectro-temporal activations learned through our procedure resemble spectro-temporal receptive fields calculated from avian primary auditory forebrain.
Parameter estimation of a nonlinear magnetic universe from observations
Creators: name: Montiel, Ariadna
name: Bretón, Nora
name: Salzano, Vincenzo
Publisher: name: arXiv
Year: 2014
Subjects: subject: Cosmology and Nongalactic Astrophysics (astro-ph.CO)
subject: General Relativity and Quantum Cosmology (gr-qc)
subject: FOS: Physical sciences

description: The cosmological model consisting of a nonlinear magnetic field obeying the Lagrangian L= γF^α, F being the electromagnetic invariant, coupled to a Robertson-Walker geometry is tested with observational data of Type Ia Supernovae, Long Gamma-Ray Bursts and Hubble parameter measurements. The statistical analysis show that the inclusion of nonlinear electromagnetic matter is enough to produce the observed accelerated expansion, with not need of including a dark energy component. The electromagnetic matter with abundance $Ω_B$, gives as best fit from the combination of all observational data sets Ω_B=0.562^{+0.037}_{-0.038} for the scenario in which α=-1, Ω_B=0.654^{+0.040}_{-0.040} for the scenario with α=-1/4 and Ω_B=0.683^{+0.039}_{-0.043} for the one with α=-1/8. These results indicate that nonlinear electromagnetic matter could play the role of dark energy, with the theoretical advantage of being a mensurable field.
description: 9 pages, 4 tables, 3 figures
:Strokes of Luck: A Study in Moral and Political Philosophy
Creators: name: Spafford, Jesse
Publisher: name: Open Access Te Herenga Waka-Victoria University of Wellington
Year: 2023
Subjects: classificationCode: 50
subject: Philosophy and religious studies
classificationCode: 5003
subject: Philosophy
subject: FOS: Philosophy, ethics and religion
classificationCode: 48
subject: Law and legal studies
classificationCode: 44
subject: Human society

description: No description supplied
Explanation, justification, and egalitarianism
Creators: name: Spafford, Jesse
Publisher: name: Open Access Te Herenga Waka-Victoria University of Wellington
Year: 2023
Subjects: classificationCode: 5003
subject: Philosophy
subject: FOS: Philosophy, ethics and religion
classificationCode: 5002
subject: History and philosophy of specific fields
classificationCode: 46
subject: Information and computing sciences
classificationCode: 50
subject: Philosophy and religious studies

description: AbstractThis paper argues that the philosophy of explanation can help inform core debates in value theory. Specifically, it argues that there is a consistent parallelism between the properties of explanation and the properties of justification such that one can reasonably infer that any property of explanation has a counterpart property of justification. Thus, by appealing to facts about the nature of explanation, one can derive various conclusions about the justifications offered by normative theorists. The paper illustrates this point by considering a debate within political philosophy over whether inequality requires justification in a way that equality does not. Egalitarians typically presume an affirmative answer to this question. However, libertarian critics note that this justificatory asymmetry cannot be simply assumed without argument. This paper argues that, by appealing to the explanation-justification parallelism, one can resolve this debate in favor of the egalitarians, as there are two properties of explanation, the justificatory analogs of which vindicate the egalitarian presumption.
Application of plant growth-promoting rhizobacteria combined with compost as a management strategy against Verticillium dahliae in tomato
Creators: name: Rahou, Youssef Ait
name: Douira, Allal
name: Tahiri, Abdel-Ilah
name: Cherkaoui, El Modafar
name: Benkirane, Rachid
name: Meddich, Abdelilah
Publisher: name: Taylor & Francis
Year: 2022
Subjects: subject: Space Science
subject: Medicine
subject: Microbiology
subject: FOS: Biological sciences
subject: Cell Biology
subject: Biotechnology
subject: Ecology
subject: Plant Biology

description: This study aimed to evaluate the effect of plant growth-promoting rhizobacteria (PGPR) and compost, applied alone or in combination, on tomato resistance to vascular wilt caused by Verticillium dahliae. Improved management of vascular wilt is important for enhanced productivity of greenhouse-grown susceptible tomato plants. The application of compost and PGPR resulted in a reduction in infection parameters compared with untreated plants inoculated with the pathogen, as well as activation of plant defence mechanisms. In the presence of the pathogen, compost application significantly improved the total fresh and dry weights by 97% and 71%, respectively, compared with pathogen-inoculated controls. The combination of compost with PGPR significantly increased chlorophyll fluorescence and stomatal conductance compared with the infected-control. In addition, the combination of compost and PGPR reduced the accumulation of stress markers such as malondialdehyde and hydrogen peroxide by 48% and 77%, respectively, and promoted the activity of antioxidant enzymes. Fruit yield and quality were also significantly improved relative to the control. The results suggest that compost applied alone or in combination with PGPR helps to suppress vascular wilt and to improve the yield and quality of tomatoes.
title: LITIAS. Lo italiano en territorios hispanófonos
Creators: name: San Vicente, Félix
name: Mazzoleni, Marco
name: Castillo, Carmen
name: de Hériz, Ana Lourdes
name: Lombardini, Hugo E.
name: Barbero Bernal, Juan Carlos
Publisher: name: CLUEB
Year: 2024

description: El proyecto LITIAS (PRIN protocolo 2017J7H322) se encuentra
ya en su fase final de desarrollo. Su finalidad más ambiciosa era (y aún es) la creación de un corpus textual que permita en un futuro la interpretación y valoración de la influencia de la lengua y cultura italianas en los países
hispanohablantes, especialmente en los de América latina. El proyecto se propone lograr este objetivo mediante la localización y catalogación de obras publicadas en estos países, específicamente, de textos didácticos (gramáticas de italiano como LE y diccionarios bilingües italiano-español) y de traducciones no literarias de originales italianos. La intención principal de este artículo es describir el proyecto ya en su fase conclusiva e informar sobre sus muchos logros.
title: Technology and embodiment in Jennifer Egan’s fiction: the digitisation of bodies, brains, and books
Creators: name: Power, Mairi Rachel
Publisher: name: University of Glasgow
Year: 2023

description: This thesis offers a reading of Jennifer Egan’s fiction that names the relationship between technologies and bodies as a central thread uniting all of her work. Combating the critical tendency to focus on 2010 novel A Visit from the Goon Squad as the primary example when discussing Egan’s work, my argument takes a thematic approach and pairs Egan’s many texts together in varied combinations in order to highlight the consistent featuring of this relationship across her body of work. In charting this, I utilise cognitive and digital theories in order to map the ways in which Egan’s characters and texts adopt the abilities of technologies. To begin, I explore the importance of flesh within Egan’s novels and analyse bodies in her work as crucial locations that mediate and contribute to the interaction between brain and world. Later chapters move onto discussing the active use of technologies to alter and improve human ability, using cognitive theory as a lens to determine the varying success of these technologies within Egan’s texts. Through doing so, I foreground embodiment as a central concern within Egan’s fiction and an important component of her discussions of technology and digital culture. Another level to this analysis considers the transformation of fiction and the digitisation of the novel. I perform a similar analysis of the book body as with the human body, charting the ways in which Egan’s work demonstrates a progressive reliance upon digital technologies—incorporating them into the visual form of her books, as a site of reading, and as a method of publicity and type of paratext. Within this analysis I comment upon the adaptive nature of fiction and situate Egan’s narrative experimentation within the long legacy of literary experimentation with narrative form. An undercurrent to my argument concerns Egan’s interaction with the legacy of postmodernism: her work begins in the countdown to the millennium and carries on into the twenty-first century. My thesis demonstrates how Egan’s relationship with technology shows her adaptation of certain postmodern concepts, bringing its ironic critique of a mediated, information heavy society into the increasingly digitised world of the 2000s. This thesis emphasises the lack of critical attention given to female authors in the postmodern and contemporary periods, and attempts to combat this by providing focused analysis of one female author.
Quantum inequality for a scalar field with a background potential
Creators: name: Kontou, Eleni-Alexandra
name: Olum, Ken D.
Publisher: name: arXiv
Year: 2014
Subjects: subject: General Relativity and Quantum Cosmology (gr-qc)
subject: Mathematical Physics (math-ph)
subject: Quantum Physics (quant-ph)
subject: FOS: Physical sciences

description: Quantum inequalities are bounds on negative time-averages of the energy density of a quantum field. They can be used to rule out exotic spacetimes in general relativity. We study quantum inequalities for a scalar field with a background potential (i.e., a mass that varies with spacetime position) in Minkowski space. We treat the potential as a perturbation and explicitly calculate the first-order correction to a quantum inequality with an arbitrary sampling function, using general results of Fewster and Smith. For an arbitrary potential, we give bounds on the correction in terms of the maximum values of the potential and its first three derivatives. The techniques we develop here will also be applicable to quantum inequalities in general spacetimes with small curvature, which are necessary to rule out exotic phenomena.
description: 20 pages
Radiation from multi-GeV electrons and positrons in periodically bent silicon crystal
Creators: name: Bezchastnov, Victor G.
name: Korol, Andrei V.
name: Solovyov, Andrey V.
Publisher: name: arXiv
Year: 2014
Subjects: subject: Accelerator Physics (physics.acc-ph)
subject: FOS: Physical sciences

description: A periodically bent Si crystal is shown to efficiently serve for producing highly monochromatic radiation in a gamma-ray energy spectral range. A short-period small-amplitude bending yields narrow undulator-type spectral peaks in radiation from multi-GeV electrons and positrons channeling through the crystal. Benchmark theoretical results on the undulator are obtained by simulations of the channeling with a full atomistic approach to the projectile-crystal interactions over the macroscopic propagation distances. The simulations are facilitated by employing the MBN Explorer package for molecular dynamics calculations on the meso- bio- and nano-scales. The radiation from the ultra-relativistic channeling projectiles is computed within the quasi-classical formalism. The effects due to the quantum recoil are shown to be significantly prominent in the gamma-ray undulator radiation.
Ensemble mean $\bf p_t$ vs charged-hadron multiplicities in high energy nuclear collisions
Creators: name: Trainor, Thomas A.
Publisher: name: arXiv
Year: 2014
Subjects: subject: High Energy Physics - Phenomenology (hep-ph)
subject: Nuclear Theory (nucl-th)
subject: FOS: Physical sciences

description: Measurements of event-ensemble mean transverse momentum $\langle p_t \rangle$ vs charged-hadron multiplicity $n_{ch}$ for $p_t$ spectra from 5 TeV p-Pb and 2.76 TeV Pb-Pb collisions and from p-p collisions for several energies have been reported recently. While in all cases $\langle p_t \rangle$ increases monotonically with $n_{ch}$ the rate of increase is very different from system to system. Comparisons with several theory Monte Carlos reveal substantial disagreements and lead to considerable uncertainty on how to interpret the $\langle p_t \rangle$ data. In the present study we develop a two-component (soft+hard) model (TCM) of $p_t$ production in high energy nuclear collisions and apply it to the $\langle p_t \rangle$ data. The soft component is assumed to be a universal feature of high energy collisions independent of A-B system or energy. The hard-component model is based on the observation that dijet production in p-p collisions does not satisfy the eikonal approximation but does so in A-A collisions. Hard-component properties are determined from previous measurements of hadron spectrum hard components, jet spectra and fragmentation functions. The TCM describes the p-p and Pb-Pb $\langle p_t \rangle$ data accurately, within data uncertainties, and the p-Pb data appear to transition smoothly from p-p to A-A $n_{ch}$ trends.
description: 11 pages, 8 figures
High-power magnetron transmitter as an RF source for superconducting linear accelerators
Creators: name: Kazakevich, Grigory
name: Johnson, Rolland
name: Flanagan, Gene
name: Marhauser, Frank
name: Yakovlev, Vyacheslav
name: Chase, Brian
name: Lebedev, Valeri
name: Nagaitsev, Sergei
name: Pasquinelli, Ralph
name: Solyak, Nikolay
name: Quinn, Kenneth
name: Wolff, Daniel
name: Pavlov, Viatcheslav
Publisher: name: arXiv
Year: 2014
Subjects: subject: Accelerator Physics (physics.acc-ph)
subject: FOS: Physical sciences

description: A concept of a high-power magnetron transmitter for operation within a wideband control feedback loop in phase and amplitude is presented. This transmitter is proposed to drive Superconducting RF (SRF) cavities for intensity-frontier GeV-scale proton/ion linacs. The transmitter performance at the dynamic control was verified in experiments with CW, S-Band, 1 kW magnetrons. The wideband control of magnetrons, required for the superconducting linacs, was realized using the magnetrons, injection-locked by the phase-modulated signals. The capabilities of the magnetrons injection-locked by the phase-modulated signals and adequateness for feeding of SRF cavities were verified by measurements of the transfer function magnitude characteristics of single and 2-cascade magnetrons, by measurements the magnetrons phase performance and by measurements of spectra of the carrier frequency. At the ratio of power of locking signal to output power less than -13 dB (in 2-cascade scheme per magnetron, respectively) we demonstrated a phase modulation bandwidth of over 1.0 MHz. The carrier frequency spectrum width about of 1 Hz at the level less than -60 dBc did not demonstrate broadening at wide range of magnitude and frequency of the phase modulation of the injection-locking signal. The wideband dynamic control of output power of the transmitter model was first experimentally demonstrated using two magnetrons, combined in power and injection-locked by the phase-modulated signals. The experiments with the injection-locked magnetrons adequately emulated the wideband dynamic control with a feedback control system, which will allow suppressing all known parasitic modulation of the accelerating field in the SRF cavities. The magnetron transmitter concept, tests of the setups and injection-locking of magnetrons by phase-modulated signals are discussed in this work.
description: 12 pages, 19 figures
Naringenin biosynthesis and fabrication of naringenin mediated nano silver conjugate for antimicrobial potential
Creators: name: Salunkhe, Jitendra D.
name: Mohite, Bhavana V.
name: Patil, Satish V.
Publisher: name: Taylor & Francis
Year: 2022
Subjects: subject: Biochemistry
subject: Medicine
subject: Pharmacology
subject: Biotechnology
subject: 39999 Chemical Sciences not elsewhere classified
subject: FOS: Chemical sciences
subject: Cancer

description: The development of resistance, instability and high doses are some drawbacks of biologically active natural products. Modification of natural compounds to make it broad spectrum is the standard approach in drug design. This paper sets to modify the naringenin by silver nanoparticle conjugation to enhance its already reported pharmacological activities. The naringenin-nano silver conjugate was synthesized by one-step green synthesis, that is, sunlight exposure confirmed by UV spectroscopy. The biosynthesized naringenin-nanosilver conjugate was tested for antiacanthamoebal and antimicrobial potential. The antibacterial potential was increased by 5.8–6.14 fold against Gram positive bacteria, that is, S. aureus and Bacillus subtilis and 4.5–16.5 fold against Gram negative bacteria, that is, Escherichia coli and Pseudomonas aeruginosa. The standard naringenin-nanosilver conjugate significantly reduced the LC50 values against the Acanthamoeba cells, by, 66% and 36%, as compared to substrate naringin and standard naringenin respectively while biotransformed naringinin-nanosilver conjugate reduced LC50 by 50.56%, compared with biotransformed naringinin. Hence modification of natural product as nanoconjugate is the best practice for improvement as an effective drug.
A random matrix approach to detect defects in a strongly scattering polycrystal: how the memory effect can help overcome multiple scattering
Creators: name: Shahjahan, Sharfine
name: Aubry, Alexandre
name: Rupin, Fabienne
name: Chassignole, Bertrand
name: Derode, Arnaud
Publisher: name: arXiv
Year: 2014
Subjects: subject: Other Condensed Matter (cond-mat.other)
subject: Disordered Systems and Neural Networks (cond-mat.dis-nn)
subject: Data Analysis, Statistics and Probability (physics.data-an)
subject: FOS: Physical sciences

description: We report on ultrasonic imaging in a random heterogeneous medium. The goal is to detect flaws embedded deeply into a polycrystalline material. A 64-element array of piezoelectric transmitters/receivers at a central frequency of 5 MHz is used to capture the Green's matrix in a backscattering configuration. Because of multiple scattering, conventional imaging completely fails to detect the deepest flaws. We utilize a random matrix approach, taking advantage of the deterministic coherence of the backscattered wave-field which is characteristic of single scattering and related to the memory effect. This allows us to separate single and multiple scattering contributions. As a consequence, we show that flaws are detected beyond the conventional limit, as if multiple scattering had been overcome.
description: 11 pages, 4 figures
HIP 102152b: A low-mass planet candidate around an old solar twin
Creators: name: Ferreira, Thiago
name: Meléndez, Jorge
Publisher: name: Zenodo
Year: 2022

description: We present the discovery of a short-period low-mass exoplanet candidate around the 8-Gyr solar twin HIP 102152 as part of the Solar Twin Planet Search survey. The system was observed over 7 years with the ESO/HARPS spectrograph. This time series was used in the past to determine the star’s rotational period as Prot = 35.7\(\pm\)1.4 days (Lorenzo-Oliveira et al. 2020). Besides the rotational modulations of stellar activity, we did not find correlations with the proposed orbital period of the candidate exoplanet. To probe the physical and orbital characteristics of HIP 102152b and assess the significance of red noise that account for stellar activity signatures, we employed a joint Keplerian and quasi-periodic Gaussian Process models. The resulting model is consistent with a mini-Neptune (\(m\sin{i} = 8\pm1~M_\oplus\))on a circular orbit with Pb,orb = 23 days, and no radial velocity slope was observed due to acceleration from an outer massive companion in this system. We compared the different four methods using the Bayesian/Akaike Information Criterion (BIC/AIC) indexes, finding out that the resulting model is favoured by a \(\Delta\)BIC/AIC = -13.4/-10.0 in comparison to the second most significant. Even exceptionally similar to the Sun in terms of refractory/volatile species abundances, HIP 102152 is severely lithium-depleted, a possible indication that this heavy material from the protoplanetary disc was used in the formation of planetesimals and other planets including HIP 102152b.
description: {"references": ["Spina et al., 2018, MNRAS, 474, 2580", "Lorenzo-Oliveira et al. 2020, MNRAS, 495, L61", "Monroe et al. 2013, ApJL, 774, L32", "Bedell, M. 2017, Illuminating the Origins of Planets with Solar Twins, PhD. Thesis, Univ. of Chicago", "Hatzes, A. P. 2019, The Doppler Method for the Detection of Exoplanets", "Fulton et al. 2018, PASP, 130"]}
title: Surveillance in Digital Technology as a Threat to Democracy
Creators: name: Nourkeyhani, Bana
Publisher: name: Capilano University
Year: 2018

description: The purpose of this paper is to demonstrate ways in which surveillance in digital technology is a threat to democracy.With the rapid evolution of digital technologies comes myriads of opportunities for growth, and as these technologies continue to evolve, the vulnerability of our global democracy becomes increasingly vulnerable. This paper uses a quantitative method as well as literature reviews to establish ways in which the use of surveillance via tools of digital technology are a threat to democracy. Additionally, Canada’s national security laws (Bill C-51  Bill C-59) are observed to further validate how democracy in Canada is explicitly and severely under threat.
description: Not peer reviewed
description: Surveillance, Technology, Cyberspace, Democracy, Privacy, Social Sorting, The Five Eyes, FVEY, Bill C-51, Bill C-59
Third generation superpartners: Results from ATLAS and CMS
Creators: name: Poveda, J.
Publisher: name: arXiv
Year: 2014
Subjects: subject: High Energy Physics - Experiment (hep-ex)
subject: High Energy Physics - Phenomenology (hep-ph)
subject: FOS: Physical sciences

description: These proceedings discuss results from recent searches for third generation SUSY particles by the ATLAS and CMS experiments at the LHC. Analyses performed with 8 TeV data probing direct pair production of bottom and top squarks are presented.
description: 8 pages, 4 figures, proceedings for the PIC2013 conference
Electronic correlations determine the phase stability of iron up to the melting temperature
Creators: name: Leonov, I.
name: Poteryaev, A. I.
name: Gornostyrev, Yu. N.
name: Lichtenstein, A. I.
name: Katsnelson, M. I.
name: Anisimov, V. I.
name: Vollhardt, D.
Publisher: name: arXiv
Year: 2014
Subjects: subject: Strongly Correlated Electrons (cond-mat.str-el)
subject: Materials Science (cond-mat.mtrl-sci)
subject: FOS: Physical sciences

description: We present theoretical results on the high-temperature phase stability and phonon spectra of paramagnetic bcc iron which explicitly take into account many-body effects. Several peculiarities, including a pronounced softening of the [110] transverse (T$_1$) mode and a dynamical instability of the bcc lattice in harmonic approximation are identified. We relate these features to the $α$-to-$γ$ and $γ$-to-$δ$ phase transformations in iron. The high-temperature bcc phase is found to be highly anharmonic and appears to be stabilized by the lattice entropy.
description: 8 pages, 3 figures
The FEROS--Lick/SDSS observational database of spectral indices of FGK stars for stellar population studies
Creators: name: Franchini, M.
name: Morossi, C.
name: Di Marcantonio, P.
name: Malagnini, M. L.
name: Chavez, M.
Publisher: name: arXiv
Year: 2014
Subjects: subject: Solar and Stellar Astrophysics (astro-ph.SR)
subject: FOS: Physical sciences

description: We present FEROS--Lick/SDSS, an empirical database of Lick/SDSS spectral indices of FGK stars to be used in population synthesis projects for discriminating different stellar populations within the integrated light of galaxies and globular clusters. From about 2500 FEROS stellar spectra obtained from the ESO Science Archive Facility we computed line--strength indices for 1085 non--supergiant stars with atmospheric parameter estimates from the AMBRE project. Two samples of 312 {\it dwarfs} and of 83 {\it subgiants} with solar chemical composition and no significant $α$--element abundance enhancement are used to compare their observational indices with the predictions of the Lick/SDSS library of synthetic indices. In general, the synthetic library reproduces very well the behaviour of observational indices as a function of temperature, but in the case of low temperature ($T_{\rm eff}$ $\lesssim $5000\,K) dwarfs; low temperature subgiants are not numerous enough to derive any conclusion. Several possible causes of the disagreement are discussed and promising theoretical improvements are presented.
description: 10 pages, 5 figures, Accepted 2014 April 28 for publication in MNRAS
Norming Sets and Related Remez-type Inequalities
Creators: name: Brudnyi, A.
name: Yomdin, Y.
Publisher: name: arXiv
Year: 2013
Subjects: subject: Functional Analysis (math.FA)
subject: FOS: Mathematics
subject: 41A17, 41A63

description: The classical Remez inequality bounds the maximum of the absolute value of a real polynomial $P$ of degree $d$ on $[-1,1]$ through the maximum of its absolute value on any subset $Z\subset [-1,1]$ of positive Lebesgue measure. Extensions to several variables and to certain sets of Lebesgue measure zero, massive in a much weaker sense, are available. Still, given a subset $Z\subset [-1,1]^n\subset {\mathbb R}^n$ it is not easy to determine whether it is ${\mathcal P}_d({\mathbb R}^n)$-norming (here ${\mathcal P}_d({\mathbb R}^n)$ is the space of real polynomials of degree at most $d$ on ${\mathbb R}^n$), i.e. satisfies a Remez-type inequality: $\sup_{[-1,1]^n}|P|\le C\sup_{Z}|P|$ for all $P\in {\mathcal P}_d({\mathbb R}^n)$ with $C$ independent of $P$. (Although ${\mathcal P}_d({\mathbb R}^n)$-norming sets are exactly those not contained in any algebraic hypersurface of degree $d$ in ${\mathbb R}^n$, there are many apparently unrelated reasons for $Z \subset [-1,1]^n$ to have this property.) In the present paper we study norming sets and related Remez-type inequalities in a general setting of finite-dimensional linear spaces $V$ of continuous functions on $[-1,1]^n$, remaining in most of the examples in the classical framework. First, we discuss some sufficient conditions for $Z$ to be $V$-norming, partly known, partly new, restricting ourselves to the simplest non-trivial examples. Next, we extend the Turan-Nazarov inequality for exponential polynomials to several variables, and on this base prove a new fewnomial Remez-type inequality. Finally, we study the family of optimal constants $N_{V}(Z)$ in the Remez-type inequalities for $V$, as the function of the set $Z$, showing that it is Lipschitz in the Hausdorff metric.
Structural, magnetic and superconducting properties of pulsed-laser-deposition-grown $\rm{La_{1.85}Sr_{0.15}CuO_{4}/La_{2/3}Ca_{1/3}MnO_{3}}$ superlattices on $\rm{(001)}$-oriented $\rm{LaSrAlO_{4}}$ substrates
Creators: name: Das, S.
name: Sen, K.
name: Marozau, I.
name: Uribe-Laverde, M. A.
name: Biskup, N.
name: Varela, M.
name: Khaydukov, Y.
name: Soltwedel, O.
name: Keller, T.
name: Dobeli, M.
name: Schneider, C. W.
name: Bernhard, C.
Publisher: name: arXiv
Year: 2014
Subjects: subject: Superconductivity (cond-mat.supr-con)
subject: Materials Science (cond-mat.mtrl-sci)
subject: FOS: Physical sciences

description: Epitaxial La1.85Sr0.15CuO4/La2/3Ca1/3MnO3 superlattices on (001)-oriented LaSrAlO4 substrates have been grown with pulsed laser deposition technique. Their structural, magnetic and superconducting properties have been determined with in-situ reflection high energy electron diffraction, x-ray diffraction, specular neutron reflectometry, scanning transmission electron microscopy, electric transport, and magnetization measurements. We find that despite the large mismatch between the in-plane lattice parameters of LSCO and LCMO these superlattices can be grown epitaxially and with a high crystalline quality. While the first LSCO layer remains clamped to the LSAO substrate, a sizeable strain relaxation occurs already in the first LCMO layer. The following LSCO and LCMO layers adopt a nearly balanced state in which the tensile and compressive strain effects yield alternating in-plane lattice parameters with an almost constant average value. No major defects are observed in the LSCO layers, while a significant number of vertical antiphase boundaries are found in the LCMO layers. The LSCO layers remain superconducting with a relatively high superconducting onset temperature of about 36 K. The macroscopic superconducting response is also evident in the magnetization data due to a weak diamagnetic signal below 10 K for H || ab and a sizeable paramagnetic shift for H || c that can be explained in terms of a vortex-pinning-induced flux compression. The LCMO layers maintain a strongly ferromagnetic state with a Curie temperature of about 190 K and a large low-temperature saturation moment of about 3.5(1) muB. These results suggest that the LSCO/LCMO superlattices can be used to study the interaction between the antagonistic ferromagnetic and superconducting orders and, in combination with previous studies on YBCO/LCMO superlattices, may allow one to identify the relevant mechanisms.
description: 13 pages, 11 figures
Finite difference approximations for a size-structured population model with distributed states in the recruitment
Creators: name: Ackleh, A. S.
name: Farkas, J. Z.
name: Li, X.
name: Ma, B.
Publisher: name: arXiv
Year: 2014
Subjects: subject: Numerical Analysis (math.NA)
subject: Analysis of PDEs (math.AP)
subject: Quantitative Methods (q-bio.QM)
subject: FOS: Mathematics
subject: FOS: Biological sciences

description: In this paper we consider a size-structured population model where individuals may be recruited into the population at different sizes. First and second order finite difference schemes are developed to approximate the solution of the mathematical model. The convergence of the approximations to a unique weak solution with bounded total variation is proved. We then show that as the distribution of the new recruits become concentrated at the smallest size, the weak solution of the distributed states-at-birth model converges to the weak solution of the classical Gurtin-McCamy-type size-structured model in the weak$^*$ topology. Numerical simulations are provided to demonstrate the achievement of the desired accuracy of the two methods for smooth solutions as well as the superior performance of the second-order method in resolving solution-discontinuities. Finally we provide an example where supercritical Hopf-bifurcation occurs in the limiting single state-at-birth model and we apply the second-order numerical scheme to show that such bifurcation occurs in the distributed model as well.
AdS plane waves, entanglement and mutual information
Creators: name: Mukherjee, Debangshu
name: Narayan, K.
Publisher: name: arXiv
Year: 2014
Subjects: subject: High Energy Physics - Theory (hep-th)
subject: FOS: Physical sciences

description: $AdS$ plane wave backgrounds are dual to CFT excited states with energy momentum density $T_{++}=Q$. Building on previous work on entanglement entropy in these and nonconformal brane plane wave backgrounds, we first describe a phenomenological scaling picture for entanglement in terms of "entangling partons". We then study aspects of holographic mutual information in these backgrounds for two strip shaped subsystems, aligned parallel or orthogonal to the flux. We focus on the wide ($Ql^d\gg 1$) and narrow ($Ql^d\ll 1$) strip regimes. In the wide strip regime, mutual information exhibits growth with the individual strip sizes and a disentangling transition as the separation between the strips increases, whose behaviour is distinct from the ground and thermal states. In the narrow strip case, our calculations have parallels with "entanglement thermodynamics" for these $AdS$ plane wave deformations. We also discuss some numerical analysis.
description: Latex, 28pgs, 5 eps figs, v2: minor modifications
title: State Research Programs Submitted by CDFW, IDFG, ODFW, and WDFW
titleType: AlternativeTitle
title: National Marine Fisheries Service Endangered Species Act (ESA) Section 7 Consultation and Magnuson–Stevens Act Essential Fish Habitat (EFH) Consultation Consultation on the Evaluation and Determination of Research Programs Submitted for Consideration Under the Endangered Species Act 4(d) Rule’s Scientific Research Limit [50 CFR 223.203(b)(7)] and Scientific Research and Monitoring Exemptions [50 CFR 223.210(c)(1)]
Creators: name: United States. National Marine Fisheries Service. West Coast Region
Publisher: name: United States. National Marine Fisheries Service. West Coast Region
Year: 2018

description: WCRO-2017-01901
Adventures with SPIRou: The APERO pipeline and LBL RV analysis tool
Creators: name: Cook, Neil James
name: Artigau, Etienne
name: Doyon, Rene
Publisher: name: Zenodo
Year: 2022
Subjects: Data reduction
Spectropolarimetry
Radial velocity
Spectroscopy
Calibration
Near infrared astronomy

description: Data reduction (pipelines and analysis software) is a critical and necessary component required to go from observations to scientific results. With the maturation of near-infrared high-resolution spectroscopy, especially when used for precision radial velocity, data reduction has been faced with unprecedented challenges in terms of how one goes from raw data to clean, calibrated, extracted, and corrected data with required precision of thousandths of a pixel. Here we present APERO and LBL. APERO is a pipeline designed to reduce observations, specifically focused on our first instrument, SPIRou, the near-infrared spectropolarimeter on the Canadian France Hawaii Telescope. The line-by-line (LBL) method of pRV measurements is designed to be outlier-resistant while taking advantage of the full RV content of the input spectra. The method splits high-resolution spectra into thousands of absorption lines for which it measures individual velocities. These velocities are combined through a simple finite mixture model that accounts for the likelihood that a given line may be an outlier due to telluric absorption or other observational biases. The combination of APERO and LBL with SPIRou leads to m/s precisions in radial velocity.
description: Paper accepted by PASP. https://arxiv.org/abs/2211.01358
description: {"references": ["Artigau, \u00c9., Astudillo-Defru, N., Delfosse, X., et al. 2014, Proc. SPIE, 9149, 91490", "Artigau, \u00c9., Cadieux, C., Cook, N. J., et al. 2022, AJ, 164, 84", "Bouchy, F., Pepe, F., & Queloz, D. 2001, A&A, 374, 733", "Cook, N. J., Artigau, \u00c9, Doyon, R., et al. 2022, arxiv: https://arxiv.org/abs/2211.01358", "Donati, J. F., Kouach, D., Moutou, C., et al. 2020, MNRAS, 498, 5684", "Hobson, M. J., Bouchy, F., Cook, N. J., et al. 2021, A&A, 648, A48", "Martioli, E., H\u00e9brard, G., Fouqu\u00e9, P., et al. 2022, A&A, 660, A86", "Ribas, I., Tuomi, M., Reiners, A., et al. 2018, Natur, 563, 365"]}
A note on coloring vertex-transitive graphs
Creators: name: Cranston, Daniel W.
name: Rabern, Landon
Publisher: name: arXiv
Year: 2014
Subjects: subject: Combinatorics (math.CO)
subject: FOS: Mathematics

description: We prove bounds on the chromatic number $χ$ of a vertex-transitive graph in terms of its clique number $ω$ and maximum degree $Δ$. We conjecture that every vertex-transitive graph satisfies $χ\le \max \left\{ω, \left\lceil\frac{5Δ+ 3}{6}\right\rceil\right\}$ and we prove results supporting this conjecture. Finally, for vertex-transitive graphs with $Δ\ge 13$ we prove the Borodin-Kostochka conjecture, i.e., $χ\le\max\{ω,Δ-1\}$.