cometadata/datacite-rtg-text-other-reclassification-records huggingface dataset:
Composição florística e estrutura da relíquia de Miombo da Estação Experimental Agronómica da Chianga, Huambo (Angola)
Creators: name: José Luis Rodríguez Sosa
name: Euclides Januário Tulumba Siquilile
Publisher: name: Zenodo
Year: 2023

description: R E S U M OO trabalho foi realizado na Estação Experimental Agronómica da Chianga, município do Huambo, Angola, com o objetivo de caracterizar a composição florística e a estrutura da vegetação de uma relíquia de Miombo, como primeiro passo para a sua gestão e conservação. Foi realizado um censo das espécies presentes, foram identificadas e contadas cada um dos seus indivíduos presentes nos estratos arbóreo e arbustivo. A estrutura florística foi caracterizada através da identificação de todas as espécies presentes, assim como foram consideradas as espécies nativas, ameaçadas e invasoras, enquanto a estrutura horizontal foi caracterizada através da análise da abundância de cada espécie através da elaboração a partir do gráfico da abundância relativa. A flora da vegetação da relíquia do Miombo está representada por 419 árvores de 30 espécies agrupadas em 19 famílias, destacando-se as famílias Fabaceae com sete espécies, Combretaceae com três espécies, bem como Bignoniaceae, Euphorbiaceae e Myrtaceae com duas espécies respetivamente, a presença de quatro espécies ameaçadas com categoria Vulnerável e nove espécies introduzidas das quais três têm potencial invasor; Por outro lado, a estrutura revela uma comunidade caracterizada fisionomicamente pela presença dominante de oito espécies arbóreas, das quais as espécies Brachystegia spiciformis, Handroanthus chrysotrichus e Terminalia brachystema representam, em conjunto, 64% da abundância das espécies relatadas.Palavras-chave: Miombo, Flora, Vegetação, Brachystegia
The scientific prerequisite for tasting archaeological remains
Creators: name: JACOBI (France), DANIEL
Publisher: name: Review of Science, Mathematics and ICT Education
Year: 2021

description: While for many years archaeological museums looked like art museums in which beautiful objects were displayed in glass cases, several exhibitions have broken with this tradition. And this is not to exhibit collections of excavated objects but to present the results of contemporary research. This break has two effects: the first is to reconfigure the archaeological exhibition. It turns its back on the world of objects to present ideas and even concepts. The second, which is a consequence of this rupture, is to require considerable pre-requisites from the uninformed public. To illustrate this rupture and its consequences, we will examine three facets of this reconfiguration. First, how basic scientific concepts such as stratigraphy and radioactive isotope dating were added to the visitors' prior knowledge. The second facet will insist on the invisibility of the visible: traces of pigmentations erased or disappeared, physico-chemical or micro-geological nature of the components previously roughly described. The third, more ideological, is the implicit hierarchy of the great civilizations. This one instructed a classification of the models. The ancient classical Greek civilization is considered to be unsurpassable compared to the modest local cultures.
description: Review of Science, Mathematics and ICT Education, Forthcoming papers
Energy conditions and current acceleration of the universe
Creators: name: Gong, Yungui
name: Wang, Anzhong
Publisher: name: arXiv
Year: 2007
Subjects: subject: Astrophysics (astro-ph)
subject: General Relativity and Quantum Cosmology (gr-qc)
subject: High Energy Physics - Phenomenology (hep-ph)
subject: High Energy Physics - Theory (hep-th)
subject: FOS: Physical sciences

description: The energy conditions provide a very promising model-independent study of the current acceleration of the universe. However, in order to connect these conditions with observations, one often needs first to integrate them, and then find the corresponding constraints on some observational variables, such as the distance modulus. Those integral forms can be misleading, and great caution is needed when one interprets them physically. A typical example is that the transition point of the deceleration parameter $q(z)$ is at about $z \simeq 0.76$ in the $Λ$CDM model. However, with the same model when we consider the dimensionless Hubble parameter $E(z)$, which involves the integration of $q(z)$, we find that $E(z)$ does not cross the line of $q(z) = 0$ before $z = 2$. Therefore, to get the correct result, we cannot use the latter to determine the transition point. With these in mind, we carefully study the constraints from the energy conditions, and find that, among other things, the current observational data indeed strongly indicate that our universe has ocne experienced an accelerating expansion phase between the epoch of galaxy formation and the present.
description: revtex4, five figures. Corrected some typos and added new references. Physics Letters B652, 63-68 (2007)
Export Fact Sheet and Import Fact Sheet
Creators: name: Statistics, Trade
name: Statistics, Trade
Publisher: name: Unknown
Year: 1964
Subjects: Agricultural and Food Policy
International Relations/Trade

description: Excerpts from the Report: U.S. agricultural exports in fiscal year 1963-64 reached an alltime record. Value totaled $6,076 million, 20 percent above the previous year's $5,078 million. Volume advanced by 20 percent over the previous year's record. The export value was equivalent to 16 percent of the $36,925 million cash receipts from farm marketings in 1963. One out of every 4 harvested acres produced for export. The output of 80 million acres of U.S. cropland moved abroad in 1963-64. The export market provided a market for three-fourths of the wheat production; two-thirds of the rice; three-fifths of the nonfat dry milk; half of the dry edible peas; over two-fifths of the tallow, soybeans, and hops; a third of the cotton, rye, and prunes; around a fourth of the lard, dried whole milk, and tobacco; and a fifth of the raisins, dry edible beans, and cottonseed; and one-sixth of the grain sorghums, and barley. U.S. agricultural imports rose 5 percent (value) in fiscal year 1963-64. U.S. imports of agricultural products totaled $4,095 million in fiscal year 1963-64 compared with $3,911 million in the previous year. Volume declined by 3 percent, with a 7 percent drop in supplementary items more than offsetting a 2 percent rise in complementary products. The increase in value resulted mainly from larger imports of complementary (noncompetitive) products, since imports of supplementary (partially competitive) commodities were about equal to the previous year. Imports of supplementary commodities totaled $2,224 million compared with the previous year's $2,208 million. Complementary items rose to $1,871 million from $1,669 million. The United States is the world's second largest agricultural importing country. The United States took about one-sixth of world agricultural imports in 1963. The United Kingdom is the world's leading importer of agricultural commodities, taking $5 billion annually in recent years; West Germany is the third largest importer of farm products ($3.9 billion) and Japan is fourth (about $2.5 billion).
description: Reprinted from Foreign Agricultural Trade of the United States November-December 1964
Expansión Cuántica: La respuesta a la paradoja de Schrödinger
Creators: name: Jorge Armando, Pérez Cortes
Publisher: name: Zenodo
Year: 2025
Subjects: subject: Quantum physics
subject: schrondinger
subject: paradox

description: La mecánica cuántica describe distribuciones de probabilidad como incertidumbres que colapsan bajo medición. Este artículo propone que los estados cuánticos están influenciados por un proceso de expansión subyacente, determinando el mecanismo de colapso. Esta expansión, representada matemáticamente por 'Z', está relacionada con la estructura fundamental del universo. Nuestro enfoque proporciona un nuevo marco para comprender las probabilidades cuánticas, en particular la paradoja del 50/50, al introducir la acción como un proceso dinámico continuo. Se demuestra que la expansión lleva al colapso de la función de onda, resolviendo paradojas cuánticas como la del gato de Schrödinger.
description: Quantum mechanics describes probability distributions as uncertainties that collapse under measurement. This paper proposes that quantum states are influenced by an underlying expansion process, determining the collapse mechanism. This expansion, represented mathematically by 'Z', is related to the fundamental structure of the universe. Our approach provides a new framework for understanding quantum probabilities, in particular the 50/50 paradox, by introducing the action as a continuous dynamical process. It is shown that expansion leads to the collapse of the wave function, resolving quantum paradoxes such as the Schrödinger's cat paradox.
Quasinormal Modes for Dynamical Black Holes
Creators: name: Lin, Kai
name: Sun, Yang-Yi
name: Zhang, Hongsheng
Publisher: name: arXiv
Year: 2021
Subjects: subject: General Relativity and Quantum Cosmology (gr-qc)
subject: FOS: Physical sciences

description: Realistic black holes are usually dynamical, noticeable or sluggish. The Vaidya metric is a significant and tractable model for simulating a dynamical black hole. In this study, we consider scalar perturbations in a dynamical Vaidya black hole, and explore the quasinormal modes by employing the matrix method. We find the proper boundary conditions of the quasinormal modes from physical analysis in the background of a dynamical black hole for the first time. The results show that the eigenfrequencies become different at the apparent horizon and null infinity, because the physical interactions propagate with finite velocity in nature. Any variation of the hole does not affect the boundary condition at null infinity in a finite time. The quasinormal modes originated around the horizon would not immediately come down to, but slowly goes to the final state following the mass accretion process of the hole. The precision of the matrix method is quite compelling, which reveals more details of the eigenfrequencies of the quasinormal mode of perturbations in the Vaidya spacetime.
The Sloan Digital Sky Survey Quasar Lens Search. III. Constraints on Dark Energy from the Third Data Release Quasar Lens Catalog
Creators: name: Oguri, Masamune
name: Inada, Naohisa
name: Strauss, Michael A.
name: Kochanek, Christopher S.
name: Richards, Gordon T.
name: Schneider, Donald P.
name: Becker, Robert H.
name: Fukugita, Masataka
name: Gregg, Michael D.
name: Hall, Patrick B.
name: Hennawi, Joseph F.
name: Johnston, David E.
name: Kayo, Issha
name: Keeton, Charles R.
name: Pindor, Bartosz
name: Shin, Min-Su
name: Turner, Edwin L.
name: White, Richard L.
name: York, Donald G.
name: Anderson, Scott F.
name: Bahcall, Neta A.
name: Brunner, Robert J.
name: Burles, Scott
name: Castander, Francisco J.
name: Chiu, Kuenley
name: Clocchiatti, Alejandro
name: Eisenstein, Daniel
name: Frieman, Joshua A.
name: Kawano, Yozo
name: Lupton, Robert
name: Morokuma, Tomoki
name: Rix, Hans-Walter
name: Scranton, Ryan
name: Sheldon, Erin Scott
Publisher: name: arXiv
Year: 2007
Subjects: subject: Astrophysics (astro-ph)
subject: FOS: Physical sciences

description: We present cosmological results from the statistics of lensed quasars in the Sloan Digital Sky Survey (SDSS) Quasar Lens Search. By taking proper account of the selection function, we compute the expected number of quasars lensed by early-type galaxies and their image separation distribution assuming a flat universe, which is then compared with 7 lenses found in the SDSS Data Release 3 to derive constraints on dark energy under strictly controlled criteria. For a cosmological constant model (w=-1) we obtain Ω_Λ=0.74^{+0.11}_{-0.15}(stat.)^{+0.13}_{-0.06}(syst.). Allowing w to be a free parameter we find Ω_M=0.26^{+0.07}_{-0.06}(stat.)^{+0.03}_{-0.05}(syst.) and w=-1.1\pm0.6(stat.)^{+0.3}_{-0.5}(syst.) when combined with the constraint from the measurement of baryon acoustic oscillations in the SDSS luminous red galaxy sample. Our results are in good agreement with earlier lensing constraints obtained using radio lenses, and provide additional confirmation of the presence of dark energy consistent with a cosmological constant, derived independently of type Ia supernovae.
description: 9 pages, 3 figures, 2 tables, accepted for publication in AJ
RBC treatment of a municipal landfill leachate : a pilot scale evaluation
Creators: name: Peddie, Craig Cameron
Publisher: name: University of British Columbia
Year: 2010

description: This study evaluated the on-site treatment of a moderately low strength municipal landfill leachate with a Rotating Biological Contactor (RBC), at pilot scale (0.9 m dia.). The leachate generally had COD and NH₃-N concentrations of less than 1000 mg/L and 50 mg/L respectively. A high treatment efficiency for both carbon removal and nitrification was achieved despite variable and intermittent loading conditions. The effluent filtrable BOD₅ was generally less than 10 mg/L and the effluent NH₃-N concentration was usually less than 1.0 mg/L. This effluent quality was achieved at mass loading levels comparable to those for sewage treatment (10.0 g BOD₅/m²*d for carbon removal and 0.8 g NH₃-N/m²*d for nitrification). The results demonstrated that long hydraulic retention times (HRT >4 hrs.) can offset the effects of lower temperatures. Nitrification efficiency in particular was shown to be HRT dependent. Limited heavy metal data indicated that heavy metals were removed at efficiencies and relative affinities comparable to those observed in activated sludge studies. An aside to this study showed that trace organics, some of which are on the EPA priority pollutant list, were present in this leachate and were effectively removed during passage through the RBC.
Hymenaster giboryi Perrier 1894
Creators: name: García-Guillén, Laura M.
name: Macías-Ramírez, Aurora
name: Ríos, Pilar
name: Manjón-Cabeza, M. Eugenia
Publisher: name: Zenodo
Year: 2023
Subjects: Biodiversity
Taxonomy
Animalia
Echinodermata
Asteroidea
Velatida
Pterasteridae
Hymenaster
Hymenaster giboryi

description: Hymenaster giboryi Perrier, 1894. AphialD: 124131. New record. (Fig. 3 a-d).
Material examined 7 preserved specimens with register number (included station): 124131 -B79 (B11V05); 124131 - B80 (B11V08); 124131 -B81 (B11V10).
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Diagnostic characters. Arms 5 and thin membrane with muscle fibre and fleshy bands and also spiraculaes (Fig. 3a). With 6 paxillar spines and 5 spines forming a wreath around the anus (Fig. 3b). Two oral spines and 2 suboral ones (Fig. 3c). With 2 rows of tubefeet, 2 adambulacral spines (Fig. 3d).
Distribution. Atlantic Ocean, west of Ireland, between Azores and Portugal, north east of Newfoundland, Caribbean Sea, Cuba, Jamaica (Perrier, 1894; Mortensen 1927; Clark & Downey 1992; Mah, 2022; Obis, 2022).
Bathymetric range. 1900 m (Mortensen 1927)– 4330 m (MNHN-IE-2019-5917 identified by Sibuet). Present study. 1565 – 1720 m.
Remarks. Fifty-two species of Hymenaster Wyville Thomson, 1873 have been described. Five of them are present in the study area: Hymenaster giboryi, Hymenaster. pellucidus Thomson, 1873, Hymenaster rex Perrier, 1885, Hymenaster reticulatus Sibuet, 1976 and Hymenaster tenuispinus Sibuet, 1976. Hymenaster giboryi and H. pellucidus present 2 or 3 adambulacral spines while the rest varies in that number but always present more than two. In addition, they differ in the paxillar spines numbers, H. giboryi has 6 and H. pellucidus range from 2 to 5 (Clark & Downey, 1992).
description: Published as part of García-Guillén, Laura M., Macías-Ramírez, Aurora, Ríos, Pilar & Manjón-Cabeza, M. Eugenia, 2023, Deep-Sea asteroids (Echinodermata; Asteroidea) from the Galician Bank (North Atlantic Ocean), pp. 228-238 in Zootaxa 5297 (2) on pages 231-234, DOI: 10.11646/zootaxa.5297.2.3, http://zenodo.org/record/7993146
An ACS Survey of Globular Clusters V: Star Catalog for Each Cluster
Creators: name: Anderson, Jay
name: Sarajedini, Ata
name: Bedin, Luigi R.
name: King, Ivan R.
name: Piotto, Giampaolo
name: Reid, I. Neill
name: Siegel, Michael
name: Majewski, Steven R.
name: Paust, Nathaniel E. Q.
name: Aparicio, Antonio
name: Milone, Antonino P.
name: Chaboyer, Brian
name: Rosenberg, Alfred
Publisher: name: arXiv
Year: 2008
Subjects: subject: Astrophysics (astro-ph)
subject: FOS: Physical sciences

description: The ACS Survey of Globular Clusters has used HST's Wide-Field Channel to obtain uniform imaging of 65 of the nearest globular clusters to provide an extensive homogeneous dataset for a broad range of scientific investigations. The survey goals required not only a uniform observing strategy, but also a uniform reduction strategy. To this end, we designed a sophisticated software program to process the cluster data in an automated way. The program identifies stars simultaneously in the multiple dithered exposures for each cluster and measures them using the best available PSF models. We describe here in detail the program's rationale, algorithms, and output. The routine was also designed to perform artificial-star tests, and we run a standard set of ~10^5 tests for each cluster in the survey. The catalog described here will be exploited in a number of upcoming papers and will eventually be made available to the public via the world-wide web.
description: 44 pages, 4 tables, 12 figures (6 in low resolution). Accepted for publication in AJ on the 16th of March 2008
Further Evidence for Looplike Fine Structure inside "Unipolar" Active Region Plages
Creators: name: Wang, Y. -M.
name: Ugarte-Urra, I.
name: Reep, J. W.
Publisher: name: arXiv
Year: 2021
Subjects: subject: Solar and Stellar Astrophysics (astro-ph.SR)
subject: FOS: Physical sciences

description: Earlier studies using extreme-ultraviolet images and line-of-sight magnetograms from the Solar Dynamics Observatory (SDO) have suggested that active region (AR) plages and strong network concentrations often have small, looplike features embedded within them, even though no minority-polarity flux is visible in the corresponding magnetograms. Because of the unexpected nature of these findings, we have searched the SDO database for examples of inverted-Y structures rooted inside "unipolar" plages, with such jetlike structures being interpreted as evidence for magnetic reconnection between small bipoles and the dominant-polarity field. Several illustrative cases are presented from the period 2013--2015, all of which are associated with transient outflows from AR "moss." The triangular or dome-shaped bases have horizontal dimensions of $\sim$2--4 Mm, corresponding to $\sim$1--3 granular diameters. We also note that the spongy-textured Fe IX 17.1 nm moss is not confined to plages, but may extend into regions where the photospheric field is relatively weak or even has mixed polarity. We again find a tendency for bright coronal loops seen in the 17.1, 19.3, and 21.1 nm passbands to show looplike fine structure and compact brightenings at their footpoints. These observations provide further confirmation that present-day magnetograms are significantly underrepresenting the amount of minority-polarity flux inside AR plages and again suggest that footpoint reconnection and small-scale flux cancellation may play a major role in coronal heating, both inside and outside ARs.
QCD radiative correction to pair-annihilation of spin-1 bosonic Dark Matter
Creators: name: Heo, Jae Ho
Publisher: name: arXiv
Year: 2008
Subjects: subject: High Energy Physics - Phenomenology (hep-ph)
subject: Astrophysics (astro-ph)
subject: FOS: Physical sciences

description: The next-to-leading order (NLO) QCD corrections are calculated for the pair-annihilation of spin-1 dark matter (DM) by dimensionally regularizing both ultraviolet and infrared singularities in non-relativistic limit (v<<1). The complete O(alphas) correction is about 8% due to the massless gluon contribution. An extra 5% will be added if there is a new interaction from a massive gluon of approximately same mass as the DM particle. The NLO QCD correction could give the sizable shift to the DM mass constrained by relic density measurements.
description: revised version
Performance Analysis of Cell-Free Massive MIMO Systems with Massive Connectivity
Creators: name: Guo, Mangqing
name: Gursoy, M. Cenk
Publisher: name: arXiv
Year: 2021
Subjects: subject: Information Theory (cs.IT)
subject: FOS: Computer and information sciences

description: In this paper, we investigate the performance of cell-free massive MIMO systems with massive connectivity. With the generalized approximate message passing (GAMP) algorithm, we obtain the minimum mean-squared error (MMSE) estimate of the effective channel coefficients from all users to all access points (APs) in order to perform joint user activity detection and channel estimation. Subsequently, using the decoupling properties of MMSE estimation for large linear systems and state evolution equations of the GAMP algorithm, we obtain the variances of both the estimated channel coefficients and the corresponding channel estimation error. Finally, we study the achievable uplink rates with zero-forcing (ZF) detector at the central processing unit (CPU) of the cell-free massive MIMO system. With numerical results, we analyze the impact of the number of pilots used for joint activity detection and channel estimation, the number of APs, and signal-to-noise ratio (SNR) on the achievable rates.
description: 6 pages, 5 figures, accepted by IEEE CCNC 2021 conference
Discovery of 442-Hz Pulsations from an X-ray Source in the Globular Cluster NGC 6440
Creators: name: Gavriil, Fotis P.
name: Strohmayer, Tod E.
name: Swank, Jean H.
name: Markwardt, Craig B.
Publisher: name: arXiv
Year: 2007
Subjects: subject: Astrophysics (astro-ph)
subject: FOS: Physical sciences

description: We report on the serendipitous discovery of a 442-Hz pulsar during a Rossi X-ray Timing Explorer (RXTE) observation of the globular cluster NGC 6440. The oscillation is detected following a burst-like event which was decaying at the beginning of the observation. The time scale of the decay suggests we may have seen the tail-end of a long-duration burst. Low-mass X-ray binaries (LMXBs) are known to emit thermonuclear X-ray bursts that are sometimes modulated by the spin frequency of the star, the so called burst oscillations. The pulsations reported here are peculiar if interpreted as canonical burst oscillations. In particular, the pulse train lasted for ~500 s, much longer than in standard burst oscillations. The signal was highly coherent and drifted down by ~2x10^-3 Hz, much smaller than the ~Hz drifts typically observed during normal bursts. The pulsations are reminiscent of those observed during the much more energetic ``superbursts'', however, the temporal profile and the energetics of the burst suggest that it was not the tail end nor the precursor feature of a superburst. It is possible that we caught the tail end of an outburst from a new `intermittent'' accreting X-ray millisecond pulsar, a phenomenon which until now has only been seen in HETE J1900.1$-$2455 (Galloway et al. 2007). We note that (Kaaret et al. 2003) reported the discovery of a 409.7 Hz burst oscillation from SAX J1748.9-2021, also located in NGC 6440. However, Chandra X-ray Observatory imaging indicates it contains several point-like X-ray sources, thus the 442 Hz object is likely a different source.
description: 4 pages, 3 figures, submitted to ApJ Letters
Clustering of luminous red galaxies I: large scale redshift space distortions
Creators: name: Cabre, Anna
name: Gaztanaga, Enrique
Publisher: name: arXiv
Year: 2008
Subjects: subject: Astrophysics (astro-ph)
subject: FOS: Physical sciences

description: This is the first paper of a series where we study the clustering of LRG galaxies in the latest spectroscopic SDSS data release, DR6, which has 75000 LRG galaxies covering over 1 $Gpc^3/h^3$ at $0.15
description: 31 pages, 65 figures
Energy efficiency of voltage waveform tailoring for the generation of excited species in RF plasma jets operated in He/N$_2$ mixtures
Creators: name: Korolov, Ihor
name: Donkó, Zoltán
name: Hübner, Gerrit
name: Liu, Yue
name: Mussenbrock, Thomas
name: Schulze, Julian
Publisher: name: arXiv
Year: 2021
Subjects: subject: Plasma Physics (physics.plasm-ph)
subject: FOS: Physical sciences

description: Based on Tunable Diode Laser Absorption Spectroscopy (TDLAS) measurements of the spatially averaged and peak helium metastable atom densities in a capacitively coupled micro atmospheric pressure plasma jet operated in He/N$_2$ mixtures, the energy efficiency of metastable species (He-I 2$^3$S$_1$) generation is compared for three different scenarios: single frequency operation at (i) 13.56 MHz and (ii) 54.12 MHz, and Voltage Waveform Tailoring (VWT) at (iii) "valleys"-waveforms synthesized from four consecutive harmonics of 13.56 MHz. For each case, the dissipated power is measured based on a careful calibration procedure of voltage and current measurements. The results are compared to PIC/MCC simulation results and very good agreement is found. The computational results show that the choice of the surface coefficients in the simulation is important to reproduce the experimental data correctly. Due to the enhanced control of the spatio-temporal electron power absorption dynamics and, thus, of the electron energy distribution function by VWT, this approach does not only provide better control of the generation of excited and reactive species compared to single frequency excitation, but in case of helium metastables the energy efficiency is also shown to be significantly higher in case of VWT.
The alternating sign matrix polytope
Creators: name: Striker, Jessica
Publisher: name: arXiv
Year: 2007
Subjects: subject: Combinatorics (math.CO)
subject: FOS: Mathematics
subject: 05C50, 52B05

description: We define the alternating sign matrix polytope as the convex hull of nxn alternating sign matrices and prove its equivalent description in terms of inequalities. This is analogous to the well known result of Birkhoff and von Neumann that the convex hull of the permutation matrices equals the set of all nonnegative doubly stochastic matrices. We count the facets and vertices of the alternating sign matrix polytope and describe its projection to the permutohedron as well as give a complete characterization of its face lattice in terms of modified square ice configurations. Furthermore we prove that the dimension of any face can be easily determined from this characterization.
description: 15 pages, 5 figures; references added, proofs clarified
Constraining Dark Energy Anisotropic Stress
Creators: name: Mota, D. F.
name: Kristiansen, J. R.
name: Koivisto, T.
name: Groeneboom, N. E.
Publisher: name: arXiv
Year: 2007
Subjects: subject: Astrophysics (astro-ph)
subject: FOS: Physical sciences

description: We investigate the possibility of using cosmological observations to probe and constrain an imperfect dark energy fluid. We consider a general parameterization of the dark energy component accounting for an equation of state, speed of sound and viscosity. We use present and future data from the cosmic microwave background radiation (CMB), large scale structures and supernovae type Ia. We find that both the speed of sound and viscosity parameters are difficult to nail down with the present cosmological data. Also, we argue that it will be hard to improve the constraints significantly with future CMB data sets. The implication is that a perfect fluid description might ultimately turn out to be a phenomenologically sufficient description of all the observational consequences of dark energy. The fundamental lesson is however that even then one cannot exclude, by appealing to observational evidence alone, the possibility of imperfectness in dark energy.
description: 9 pages, 12 figures. Accepted for publication at Mon. Not. Roy. Astro. Soc
Quantum aspects of a noncommutative supersymmetric kink
Creators: name: Vassilevich, D. V.
Publisher: name: arXiv
Year: 2008
Subjects: subject: High Energy Physics - Theory (hep-th)
subject: FOS: Physical sciences

description: We consider quantum corrections to a kink of noncommutative supersymmetric phi^4 theory in 1+1 dimensions. Despite the presence of an infinite number of time derivatives in the action, we are able to define supercharges and a Hamiltonian by using an unconventional canonical formalism. We calculate the quantum energy E of the kink (defined as a half-sum of the eigenfrequencies of fluctuations) which coincides with its' value in corresponding commutative theory independently of the noncommutativity parameter. The renormalization also proceeds precisely as in the commutative case. The vacuum expectation value of the new Hamiltonian is also calculated and appears to be consistent with the value of the quantum energy E of the kink.
description: 20 pages, v2: a reference added
В поисках бояр Романовых: междисциплинарное исследование усыпальницы XVI–XVIII вв. в Знаменской церкви Новоспасского монастыря в Москве. Вып. 1.
Creators: name: Беляев, Л.А.
name: Медникова, М.Б.
Publisher: name: Институт археологии РАН
Year: 2019
Subjects: каменные саркофаги
эпиграфика
Новоспасский монастырь
XVI–XVII вв
биоархеология
палеоантропологический источник
идентификация останков
палеопатология
морфология
реконструкция лица по черепу
изотопный анализ диеты
радиология
микроскопия
рентгенофлуоресцентный анализ
качество жизни населения по данным антропологического источника
палеогенетика
sarcophagi. epigraphic
the New Monastery of the Savior
16th– 17th cc
bioarchaeology
palaeoanthropological sources
identification of remains
palaeopathology
morphology
reconstruction of appearance
isotopic analyses of diet
radiology
microscopy
RFA
life quality of people based on anthropological data
palaeogenetics

description: Новоспасский монастырь в XVI в. стал усыпальницей боярского рода Захарьиных-Юрьевых-Романовых. Многочисленные внуки Романа Юрьевича Захарьина, дети Никиты Романовича, образовали в последней трети XVI в. клан «Никитичей», после смерти царя Федора Ивановича вступивший в борьбу за царский престол. Борис Годунов подверг их жестокой опале, но после вступления на престол Лжедмитрия останки умерших перевезли из мест ссылки в родовой монастырь, позже построив поминальный храм Знамения, в конце XVIII в. целиком перестроенный. В нем почитали особую Палатку Никитичей. На ее участке экспедиция Института археологии РАН в 2014 г. изучила каменные саркофаги, надгробия, вещи и костные останки. Анализ письменных источников и сохранившиеся надписи указали на погребения членов семьи князей Черкасских (близких родственников бояр Романовых) и родоначальницы этой ветви, княгини М.Н. Черкасской (Романовой). Междисциплинарное исследование позволило решить вопросы идентификации и сделать заключение об образе и качестве жизни представителей боярских семей, стоявших в XVI – начале XVII в. у истоков династии Романовых.
description: Since the 16th c. the New Monastery of the Savior became the burial ground of the Romanov boyar family. The numerous descendants of Roman Zacharyin established the powerful clan of «Nikitichi» (the children of Nikita) at the end of the 16th c. After the death of the Tzar Feodor they were disgraced, imprisoned and exiled. But after the accession of False Dmitry the 1st their remains were transferred from the Northern Russia to their ancestral monastery of the Savior. The special chapel was erected over the tombs, fully reconstructed in the late 18th c. In 2014 the excavations of the Institute of archaeology RAS (under the supervision of Leonid Belyaev) discovered the stone sarcophagi, tomb stones, artifacts and human remains. The epigraphy and the written sources indicated burials of the Princely family of Cherkasy, the close relatives of the Romanovs, including the founder of this brunch Princess Marfa Romanova. The multidisciplinary study allowed to identify remains and to research life style and life quality of the representatives of the aristocratic families of the 16th and 17th cc.
Additional file 1 of Associations of residential green space with internalizing and externalizing behavior in early childhood
Creators: name: Hazlehurst, Marnie F.
name: Hajat, Anjum
name: Tandon, Pooja S.
name: Szpiro, Adam A.
name: Kaufman, Joel D.
name: Tylavsky, Frances A.
name: Hare, Marion E.
name: Sathyanarayana, Sheela
name: Loftus, Christine T.
name: LeWinn, Kaja Z.
name: Bush, Nicole R.
name: Karr, Catherine J.
Publisher: name: figshare
Year: 2024
Subjects: subject: Medicine
subject: Biotechnology
subject: Environmental Sciences not elsewhere classified
subject: Sociology
subject: FOS: Sociology
subject: Biological Sciences not elsewhere classified
subject: Cancer
subject: Science Policy

description: Supplementary Material 1
Clustering of luminous red galaxies II: small scale redshift space distortions
Creators: name: Cabre, Anna
name: Gaztanaga, Enrique
Publisher: name: arXiv
Year: 2008
Subjects: subject: Astrophysics (astro-ph)
subject: FOS: Physical sciences

description: This is the second paper of a series where we study the clustering of LRG galaxies in the latest spectroscopic SDSS data release, DR6, which has 75000 LRG galaxies covering over 1 $Gpc^3/h^3$ for $0.15
description: 13 pagfes, 24 figrues
An experimental investigation of the ultimate capacity of single plate connections
Creators: name: Wong, Henry H. J.
Publisher: name: University of British Columbia
Year: 2010

description: Single plate connections are becoming increasingly popular in joining beams to girders and beams to columns and are particularly superior in the case of skewed connections. However, there are no comprehensive design rules available for the complete single plate connection. Related methods deal only with specific connection problems for example eccentrically loaded bolted and welded connections. Generally, for a welded connection attached to a rigid support the strength of the weld is considered critical. However, it has to be recognized that the base metal in the vicinity of the weld may become locally overstressed before the weld strength becomes critical leading to inelastic failure, or buckling of the supporting member. An experimental investigation using full scale test specimens was conducted on the overall ultimate load carrying capacity of the single plate connections joining beams to girders. It was found that for ratios of connection plate depth to the depth of the supporting girder of less than 60%, there were localized regions of the girder in the vicinity of the connection plate which became highly overstressed at loads much below the girder's ultimate shear capacity. These regions included the top flange of the girder just above the connection plate showing torsional buckling due to the closeness of the top flange, plate buckling of the top flange above the connection plate due to combined torsional and flexural stresses, and plate buckling of the girder web below the connection plate. The ultimate failure load of the single plate connections was found to be at a load much lower than the girder's ultimate shear capac ity. From the analysis of the experimental results and parameter studies, a design formula was proposed which can be used to predict the ultimate capacity of single plate connections. The formula incorporated the skew angle of the connection and the ultimate torsional moment resistance of the connection plate in addition to the ultimate shear force resistance, ultimate torsional moment resistance, and bending moment resistance of the supporting girder. The test results showed the design formula was a good indicator for the prediction of the ultimate capacity of single plate connections.
Some remarks on sinc integrals and their connection with combinatorics, geometry and probability
Creators: name: Bradley, David M.
Publisher: name: arXiv
Year: 2007
Subjects: subject: Classical Analysis and ODEs (math.CA)
subject: Combinatorics (math.CO)
subject: FOS: Mathematics
subject: 42A38; 52B11, 42A61, 42A85, 26B15, 51M25, 60E10

description: We give an alternative, combinatorial/geometrical evaluation of a class of improper sinc integrals studied by the Borweins. A probabilistic interpretation is also noted and used to shed light on a related combinatorial identity.
description: 6 pages, AMSLaTeX
Photon wave functions, wave-packet quantization of light, and coherence theory
Creators: name: Smith, Brian J.
name: Raymer, M. G.
Publisher: name: arXiv
Year: 2007
Subjects: subject: Quantum Physics (quant-ph)
subject: FOS: Physical sciences

description: The monochromatic Dirac and polychromatic Titulaer-Glauber quantized field theories (QFTs) of electromagnetism are derived from a photon-energy wave function in much the same way that one derives QFT for electrons, that is, by quantization of a single-particle wave function. The photon wave function and its equation of motion are established from the Einstein energy-momentum-mass relation, assuming a local energy density. This yields a theory of photon wave mechanics (PWM). The proper Lorentz-invariant single-photon scalar product is found to be non-local in coordinate space, and is shown to correspond to orthogonalization of the Titulaer-Glauber wave-packet modes. The wave functions of PWM and mode functions of QFT are shown to be equivalent, evolving via identical equations of motion, and completely describe photonic states. We generalize PWM to two or more photons, and show how to switch between the PWM and QFT viewpoints. The second-order coherence tensors of classical coherence theory and the two-photon wave functions are shown to propagate equivalently. We give examples of beam-like states, which can be used as photon wave functions in PWM, or modes in QFT. We propose a practical mode converter based on spectral filtering to convert between wave packets and their corresponding biorthogonal dual wave packets.
description: 34 pages, 3 figures, minor corrections
Generation of ultra-relativistic monoenergetic electron bunches via a synergistic interaction of longitudinal electric and magnetic fields of a twisted laser
Creators: name: Shi, Yin
name: Blackman, David
name: Stutman, Dan
name: Arefiev, Alexey
Publisher: name: arXiv
Year: 2021
Subjects: subject: Plasma Physics (physics.plasm-ph)
subject: FOS: Physical sciences

description: We use 3D simulations to demonstrate that high-quality ultra-relativistic electron bunches can be generated upon reflection of a twisted laser beam off a plasma mirror. The unique topology of the beam with a twist index $|l| = 1$ creates an accelerating structure dominated by longitudinal laser electric and magnetic fields in the near-axis region. We show that the magnetic field is essential for creating a train of dense mono-energetic bunches. For a 6.8~PW laser, the energy reaches 1.6~GeV with a spread of 5.5\%. The bunch duration is 320 as, its charge is 60~pC and density is $\sim 10^{27}$~m$^{-3}$. The results are confirmed by an analytical model for the electron energy gain. These results enable development of novel laser-driven accelerators at multi-PW laser facilities.
Improving decision-making through material flow cost accounting: the case of VietGreen bottled mineral water company
Creators: name: Tran, Thuy Thanh
name: Herzig, Christian
name: Tran, Thuy Thanh
name: Herzig, Christian
Publisher: name: Unknown
Year: 2021
Subjects: subject: Agribusiness
subject: Environmental Economics and Policy
subject: bottled mineral water production
subject: economic and environmental performance
subject: eco-efficiency
subject: material flow cost accounting
subject: decision-making

description: VietGreen, headquartered in the South of Vietnam, is a bottled mineral water company striving towards becoming a leading mineral water producer with a strong reputation for social responsibility and integrity. This case describes VietGreen’s decision to explore the potential of material flow cost accounting (MFCA) for enhanced eco-efficiency and achieving the company’s long-term goals. It introduces the students to the company’s major challenges in meeting existing and newly introduced environmental regulations and in dealing with various controversial perspectives of managers involved in a project to implement MFCA. The focal questions of the case are why and how the company’s management should invest in and apply MFCA to implement its major strategic objectives. In particular, it focuses on the tension between measures improving either environmental or economic performance as well as the search for solutions contributing to both types of goals.
Noncommutative associative superproduct for general supersymplectic forms
Creators: name: De Castro, A.
name: Martin, I.
name: Quevedo, L.
name: Restuccia, A.
Publisher: name: arXiv
Year: 2008
Subjects: subject: High Energy Physics - Theory (hep-th)
subject: FOS: Physical sciences

description: We define a noncommutative and nonanticommutative associative product for general supersymplectic forms, allowing the explicit treatment of non(anti)commutative field theories from general nonconstant string backgrounds like a graviphoton field. We propose a generalization of deformation quantization a la Fedosov to superspace, which considers noncommutativity in the tangent bundle instead of base space, by defining the Weyl super product of elements of Weyl super algebra bundles. Super Poincare symmetry is not broken and chirality seems not to be compromised in our formulation. We show that, for a particular case, the projection of the Weyl super product to the base space gives rise the Moyal product for non(anti)commutative theories.
description: 22 pages, revtex4. References added. Comments added. Includes additional theorem proofs
Cellular Systems with Full-Duplex Amplify-and-Forward Relaying and Cooperative Base-Stations
Creators: name: Somekh, Oren
name: Simeone, Osvaldo
name: Poor, H. Vincent
name: Shamai, Shlomo
Publisher: name: arXiv
Year: 2007
Subjects: subject: Information Theory (cs.IT)
subject: FOS: Computer and information sciences

description: In this paper the benefits provided by multi-cell processing of signals transmitted by mobile terminals which are received via dedicated relay terminals (RTs) are assessed. Unlike previous works, each RT is assumed here to be capable of full-duplex operation and receives the transmission of adjacent relay terminals. Focusing on intra-cell TDMA and non-fading channels, a simplified uplink cellular model introduced by Wyner is considered. This framework facilitates analytical derivation of the per-cell sum-rate of multi-cell and conventional single-cell receivers. In particular, the analysis is based on the observation that the signal received at the base stations can be interpreted as the outcome of a two-dimensional linear time invariant system. Numerical results are provided as well in order to provide further insight into the performance benefits of multi-cell processing with relaying.
description: To appear in the Proc. of the 2007 IEEE International Symposium on Information Theory
Two Jovian-Mass Planets in Earthlike Orbits
Creators: name: Robinson, Sarah E.
name: Laughlin, Gregory
name: Vogt, Steven S.
name: Fischer, Debra A.
name: Butler, R. Paul
name: Marcy, Geoffrey W.
name: Henry, Gregory W.
name: Driscoll, Peter
name: Takeda, Genya
name: Johnson, John A.
Publisher: name: arXiv
Year: 2007
Subjects: subject: Astrophysics (astro-ph)
subject: FOS: Physical sciences

description: We report the discovery of two new planets: a 1.94 M_Jup planet in a 1.8-year orbit of HD 5319, and a 2.51 M_Jup planet in a 1.1-year orbit of HD 75898. The measured eccentricities are 0.12 for HD 5319 b and 0.10 for HD 75898 b, and Markov Chain Monte Carlo simulations based on derived orbital parameters indicate that the radial velocities of both stars are consistent with circular planet orbits. With low eccentricity and 1 < a < 2 AU, our new planets have orbits similar to terrestrial planets in the solar system. The radial velocity residuals of both stars have significant trends, likely arising from substellar or low-mass stellar companions.
description: 32 pages, including 11 figures and 5 tables. Accepted by ApJ
Paisagens icônicas e seus potenciais para o desenvolvimento local dos Campos Neutrais do Rio Grande do Sul (Brasil)
Creators: name: Anelize Milano Cardoso
name: and others
Publisher: name: Zenodo
Year: 2023

description: R E S U M OOs Campos Neutrais se localizam no Extremo sul do estado do Rio Grande do Sul (Brasil) e se inserem no contexto geológico da Planície Costeira desse estado. Nos Campos Neutrais predominam paisagens com potenciais valores patrimoniais, submetidas a distintas formas de pressões antropogênicas. A geodiversidade desta porção é marcada por características particulares de morfogênese recente e morfodinâmica controlada pelos sistemas fluvial, lacustre e marinho. Assim, o objetivo deste artigo é identificar e analisar as paisagens icônicas dos Campos Neutrais do Rio Grande do Sul e seus potenciais para o desenvolvimento local, mais especificamente nos municípios de Santa Vitória do Palmar e Chuí. A metodologia utilizada no presente trabalho abrangeu a realização de uma pesquisa em referenciais bibliográficos sobre a área em estudo, a realização de entrevistas com historiadores e atores locais conhecedores da história dos Campos Neutrais, além da realização de trabalhos de campo. Os resultados evidenciam que importantes áreas do território dos Campos Neutrais possuem paisagens com forte apelo geopatrimonial que precisam ser conservadas para que, simultaneamente, advenham investimentos no turismo e, em estágios mais avançados, estratégias em geoturismo. Por fim, foram evidenciados os principais potenciais e possibilidades ligados a algumas das paisagens icônicas dos Campos Neutrais, para proposições ao desenvolvimento local de forma sustentável.Palavras-Chaves: paisagens icônicas; geodiversidade; geopatrimônio; desenvolvimento local; Campos Neutrais.
An MHD Modeling of Successive X2.2 and X9.3 Solar Flares of 2017 September 6
Creators: name: Inoue, Satoshi
name: Bamba, Yumi
Publisher: name: arXiv
Year: 2021
Subjects: subject: Solar and Stellar Astrophysics (astro-ph.SR)
subject: FOS: Physical sciences

description: Solar active region 12673 produced two successive X-class flares (X2.2 and X9.3) approximately 3 hours apart in September 2017. The X9.3 was the recorded largest solar flare in Solar Cycle 24. In this study we perform a data-constrained magnetohydrodynamic simulation taking into account the observed photospheric magnetic field to reveal the initiation and dynamics of the X2.2 and X9.3 flares. According to our simulation, the X2.2 flare is first triggered by magnetic reconnection at a local site where at the photosphere the negative polarity intrudes into the opposite-polarity region. This magnetic reconnection expels the innermost field lines upward beneath which the magnetic flux rope is formed through continuous reconnection with external twisted field lines. Continuous magnetic reconnection after the X2.2 flare enhances the magnetic flux rope, which is lifted up and eventually erupts via the torus instability. This gives rise to the X9.3 flare.
description: 22 pages, 11 figures, accepted for publication in ApJ