cometadata/datacite-rtg-text-other-reclassification-records huggingface dataset:
Geological and geotechnical constraints in the Irish Sea for offshore renewable energy
Creators: name: Coughlan, Mark
name: Long, Mike
name: Doherty, Paul
Publisher: name: Taylor & Francis
Year: 2020
Subjects: subject: 59999 Environmental Sciences not elsewhere classified
subject: FOS: Earth and related environmental sciences
subject: 39999 Chemical Sciences not elsewhere classified
subject: FOS: Chemical sciences
subject: Ecology
subject: FOS: Biological sciences
subject: 69999 Biological Sciences not elsewhere classified
subject: 80699 Information Systems not elsewhere classified
subject: FOS: Computer and information sciences
subject: Inorganic Chemistry
subject: Science Policy
subject: Hematology

description: A 1:1,000,000 map of the Irish Sea, within the Irish Economic Exclusion Zone, is presented highlighting the spatial distribution of potential geological and geotechnical constraints to offshore wind energy development. In this mapping exercise we incorporated existing multibeam echosounder bathymetric and backscatter data collected by the Integrated Mapping for the Sustainable Development of Ireland’s Marine Resource programme. ArcGIS was used to interrogate the bathymetric data and produce maps for seabed morphological characteristics. Backscatter data and QTC Multiview derived sediment classification was used in conjunction with data from the literature to link sediment distribution with sediment transport pathways and to assess the possible impact on infrastructure. The result is a spatial constraints map, which may be used by developers, consultants and marine spatial planning authorities alike to help site projects and plan de-risking site investigations.
Geotechnics for rockfall assessment in the volcanic island of Gran Canaria (Canary Islands, Spain)
Creators: name: Sarro, Roberto
name: Mateos, Rosa María
name: Reichenbach, Paola
name: Aguilera, Héctor
name: Riquelme, Adrián
name: Hernández-Gutiérrez, Luis Enrique
name: Martín, Alejandro
name: Barra, Anna
name: Solari, Lorenzo
name: Monserrat, Oriol
name: Alvioli, Massimiliano
name: Fernández-Merodo, José Antonio
name: López-Vinielles, Juan
name: Herrera, Gerardo
Publisher: name: Taylor & Francis
Year: 2020
Subjects: subject: Microbiology
subject: FOS: Biological sciences
subject: Genetics
subject: Physiology
subject: Evolutionary Biology
subject: 59999 Environmental Sciences not elsewhere classified
subject: FOS: Earth and related environmental sciences
subject: Ecology
subject: Sociology
subject: FOS: Sociology
subject: 69999 Biological Sciences not elsewhere classified
subject: 110309 Infectious Diseases
subject: FOS: Health sciences

description: The island of Gran Canaria (Canary Islands, Spain) is characterized by a large variability of volcanic rocks reflecting its volcanic evolution. The geological map provided by Geological Survey of Spain at 1:25.000 scale shows more than 109 different lithologies and it is too complex for environmental and engineering purposes. This work presents a simplified geotechnical map with a small number of classes grouping up units with similar geotechnical behaviours. The lithologies were grouped using about 350 rock samples, collected in the seven major islands of the Archipelago. The geotechnical map was used to model rockfall hazard in the entire island of Gran Canaria, where rockfalls are an important threat. The rockfall map was validated with 128 rockfall events along the GC-200 road, located in the NW sector of Gran Canaria. About 96% of the events occurred along sections of the road where the number of expected trajectories is high or moderate.
Geomorphology of the Sulden River basin (Italian Alps) with a focus on sediment connectivity
Creators: name: Buter, Anuschka
name: Spitzer, Antonia
name: Comiti, Francesco
name: Heckmann, Tobias
Publisher: name: Taylor & Francis
Year: 2020
Subjects: subject: 59999 Environmental Sciences not elsewhere classified
subject: FOS: Earth and related environmental sciences
subject: Ecology
subject: FOS: Biological sciences
subject: Sociology
subject: FOS: Sociology
subject: 69999 Biological Sciences not elsewhere classified
subject: Inorganic Chemistry
subject: FOS: Chemical sciences

description: An area-wide digital geomorphological map consisting of 12,180 non-overlapping polygons was created for the Sulden river basin (South Tyrol, Italian Alps) with the purpose to carry out a GIS-based sediment connectivity analysis. Thirty-one landform types were defined with respect to their role within sediment cascades. As such, the classification and the related symbology partly differ from a traditional geomorphological map where several areal objects are frequently represented by scaled and rotated point symbols. The catchment (∼130 km²), exhibits a high geomorphological variability as well as relatively large glacierized areas. We used the geomorphological map for a first qualitative estimate of the main differences between the two major sub-basins concerning the components of the sediment cascades: while the Trafoi sub-catchment exhibits a high number of small landslides and debris flow channels (i.e. source and transport landforms), the Sulden sub-catchment is rather characterized by large proglacial and talus landforms (i.e. temporary storage landforms).
Quantum control in spintronics
Creators: name: Ardavan, A.
name: Briggs, G. A. D.
Publisher: name: arXiv
Year: 2011
Subjects: subject: Quantum Physics (quant-ph)
subject: FOS: Physical sciences

description: Superposition and entanglement are uniquely quantum phenomena. Superposition incorporates a phase which contains information surpassing any classical mixture. Entanglement offers correlations between measurements in quantum systems that are stronger than any which would be possible classically. These give quantum computing its spectacular potential, but the implications extend far beyond quantum information processing. Early applications may be found in entanglement enhanced sensing and metrology. Quantum spins in condensed matter offer promising candidates for investigating and exploiting superposition and entanglement, and enormous progress is being made in quantum control of such systems. In GaAs, individual electron spins can be manipulated and measured, and singlet-triplet states can be controlled in double-dot structures. In silicon, individual electron spins can be detected by ionisation of phosphorous donors, and information can be transferred from electron spins to nuclear spins to provide long memory times. Electron and nuclear spins can be manipulated in nitrogen atoms incarcerated in fullerene molecules, which in turn can be assembled in ordered arrays. Spin states of charged nitrogen vacancy centres in diamond can be manipulated and read optically. Collective spin states in a range of materials systems offer scope for holographic storage of information. Conditions are now excellent for implementing superposition and entanglement in spintronic devices, thereby opening up a new era of quantum technologies.
description: 17 pages, 6 figures; a short review of quantum spintronics for a special issue of RS Transactions on 'New Directions in Spintronics'
The Megamaser Cosmology Project. II. The Angular-Diameter Distance to UGC 3789
Creators: name: Braatz, J. A.
name: Reid, M. J.
name: Humphreys, E. M. L.
name: Henkel, C.
name: Condon, J. J.
name: Lo, K. Y.
Publisher: name: arXiv
Year: 2010
Subjects: subject: Cosmology and Nongalactic Astrophysics (astro-ph.CO)
subject: FOS: Physical sciences

description: The Megamaser Cosmology Project (MCP) aims to determine H0 by measuring angular-diameter distances to galaxies in the Hubble flow using observations of water vapor megamasers in the circumnuclear accretion disks of active galaxies. The technique is based only on geometry and determines H0 in one step, independent of standard candles and the extragalactic distance ladder. In Paper I we presented a VLBI map of the maser emission from the Seyfert 2 galaxy UGC 3789. The map reveals an edge-on, sub-parsec disk in Keplerian rotation, analogous to the megamaser disk in NGC 4258. Here we present 3.2 years of monthly GBT observations of the megamaser disk in UGC 3789. We use these observations to measure the centripetal accelerations of both the systemic and high-velocity maser components. The measured accelerations suggest that maser emission lines near the systemic velocity originate on the front side of the accretion disk, primarily from segments of two narrow rings. Adopting a two-ring model for the systemic features, we determine the angular-diameter distance to UGC 3789 to be 49.9 +/- 7.0 Mpc. This is the most accurate geometric distance yet obtained to a galaxy in the Hubble flow. Based on this distance, we determine H0 = 69 +/- 11 km/s/Mpc. We also measure the mass of the central black hole to be 1.09 x 10^7 solar masses +/- 14%. With additional observations the uncertainty in the distance to this galaxy can be reduced to under 10%. Observations of megamaser disks in other galaxies will further reduce the uncertainty in H0 as measured by the MCP.
description: 23 pages, 6 figures, Accepted for publication in ApJ
Cooperative Communications
Creators: name: Ingalsbe, Gene
name: Ingalsbe, Gene
Publisher: name: Unknown
Year: 1988
Subjects: Agribusiness
Teaching/Communication/Extension/Profession

description: Excerpts from the report: Cooperative communications activities cover traditional business communications but extend to the educational dimension associated with the unique operating characteristics of the cooperative enterprise. Though nearly everything that occurs in a cooperative involves some form of communications, this publication focuses on those activities normally identified as information and member and public relations functions.
Pseudodifferential p-adic vector fields and pseudodifferentiation of a composite p-adic function
Creators: name: Albeverio, S.
name: Kozyrev, S. V.
Publisher: name: arXiv
Year: 2011
Subjects: subject: Metric Geometry (math.MG)
subject: FOS: Mathematics

description: We discuss transformation of p-adic pseudodifferential operators (in the one-dimensional and multidimensional cases) with respect to p-adic maps which correspond to automorphisms of the tree of balls in the corresponding p-adic spaces. In the dimension one we find a rule of transformation for pseudodifferential operators. In particular we find the formula of pseudodifferentiation of a composite function with respect to the Vladimirov p-adic fractional differentiation operator. We describe the frame of wavelets for the group of parabolic automorphisms of the tree of balls in the p-adic field. In many dimensions we introduce the group of mod p-affine transformations, the family of pseudodifferential operators corresponding to pseudodifferentiation along vector fields on the tree of balls in p-adic miltidimensional space and obtain a rule of transformation of the introduced pseudodifferential operators with respect to mod p-affine transformations.
Structural geology of Ganymede regional groove systems (60°N–60°S)
Creators: name: Rossi, Costanza
name: Cianfarra, Paola
name: Salvini, Francesco
Publisher: name: Taylor & Francis
Year: 2019
Subjects: subject: Biophysics
subject: Evolutionary Biology
subject: FOS: Biological sciences
subject: 59999 Environmental Sciences not elsewhere classified
subject: FOS: Earth and related environmental sciences
subject: 69999 Biological Sciences not elsewhere classified
subject: Inorganic Chemistry
subject: FOS: Chemical sciences
subject: Science Policy

description: Brittle deformation on Ganymede surface is represented by grooves tectonic linear landforms. These are regional scale structures that show well-defined morphology from straight to curvilinear. High density of grooves occupies most of the light terrain of the satellite, the grooved terrain. We map grooves on the USGS Voyager and Galileo Mosaic of Ganymede in order to unravel their spatial distribution and tectonic setting. A total of 14,707 grooves were identified, digitized and statistically analysed. A quantitative structural geology approach was used to classify grooves, by considering their azimuth and regional rotation. This procedure allowed to recognize a total of four groove families, named the NE, WNW, NW, and N-S super-systems. The presented structural map represents a tool to study the stress conditions associated with the groove formation and evolution. This map also aims to contribute to the scientific preparation of the upcoming missions and future exploration of Ganymede.
Realization of the spectrum generating algebra for the generalized Kratzer potentials
Creators: name: Oyewumi, K. J.
Publisher: name: arXiv
Year: 2010
Subjects: subject: Quantum Physics (quant-ph)
subject: Mathematical Physics (math-ph)
subject: FOS: Physical sciences

description: The dynamical symmetries of the Kratzer-type molecular potentials (generalized Kratzer molecular potentials) are studied by using the factorization method. The creation and annihilation (ladder) operators for the radial eigenfunctions satisfying quantum dynamical algebra $SU(1, 1)$ are established. Factorization method is a very simple method of calculating the matrix elements from these ladder operators. The matrix elements of different functions of $r$, $r\frac{d}{dr}$, their sum $Γ_{1}$ and difference $Γ_{2}$ are evaluated in a closed form. The exact bound state energy eigenvalues $E_{n, \ell}$ and matrix elements of $r$, $r\frac{d}{dr}$, their sum $Γ_{1}$ and difference $Γ_{2}$ are calculated for various values of $n$ and $\ell$ quantum numbers for $CO$ and $NO$ diatomic molecules for the two potentials. The results obtained are in very good agreement with those obtained by other methods.
description: 20pages, 1 figure
Electrical detection of free induction decay and Hahn echoes in phosphorus doped silicon
Creators: name: Lu, Jinming
name: Hoehne, Felix
name: Stegner, Andre R.
name: Dreher, Lukas
name: Huebl, Hans
name: Stutzmann, Martin
name: Brandt, Martin S.
Publisher: name: arXiv
Year: 2011
Subjects: subject: Materials Science (cond-mat.mtrl-sci)
subject: FOS: Physical sciences

description: Paramagnetic centers in a solid-state environment usually give rise to inhomogenously broadened electron paramagnetic resonance (EPR) lines, making conventionally detected free induction decay (FID) signals disappear within the spectrometer dead time. Here, experimental results of an electrically detected FID of phosphorus donors in silicon epilayers with natural isotope composition are presented, showing Ramsey fringes within the first 150 ns. An analytical model is developed to account for the data obtained as well as for the results of analogous two-pulse echo experiments. The results of a numerical calculation are further presented to assess the capability of the method to study spin-spin interactions.
description: 9 pages, 9 figures
Viral quasispecies profiles as the result of the interplay of competition and cooperation
Creators: name: Arbiza, Juan
name: Mirazo, Santiago
name: Fort, Hugo
Publisher: name: arXiv
Year: 2010
Subjects: subject: Adaptation and Self-Organizing Systems (nlin.AO)
subject: Statistical Mechanics (cond-mat.stat-mech)
subject: Biological Physics (physics.bio-ph)
subject: Populations and Evolution (q-bio.PE)
subject: FOS: Physical sciences
subject: FOS: Biological sciences

description: Viral quasispecies can be regarded as a swarm of genetically related mutants or a quasispecies (QS). A common formalism to approach QS is the replicator-mutator equation (RME). However, a problem with the RME is how to quantify the interaction coefficients between viral variants. Here, this is addressed by adopting an ecological perspective and resorting to the niche theory of competing communities, which assumes that the utilization of resources primarily determines ecological segregation between competing individuals (the different viral variants that constitute the QS). Using this novel combination of RME plus the ecological concept of niche overlapping, for describing QS, we explore the population distributions of viral variants that emerge, as well as the corresponding dynamics. We observe that the population distribution requires very long transients both to A) reach equilibrium and B) to show a clear dominating master sequence. Based on different independent and recent experimental evidence, we find that when some cooperation or facilitation between variants is included in appropriate doses we can solve both A) and B). We show that a useful quantity to calibrate the degree of cooperation is the Shannon entropy. Therefore, in order to get a typical quasispecies profile, it seems that pure competition is not enough. Rather, some degree of cooperation among viral variants is needed. This has several biological implications that might contribute to shed light on the mechanisms operating in QS dynamics and to understand the QS as a whole entity.
description: 23 pages, 5 figures
HST Spectral Observations near the He II Ly-alpha Break: Implications for He II Reionization
Creators: name: Syphers, David
name: Anderson, Scott F.
name: Zheng, Wei
name: Meiksin, Avery
name: Haggard, Daryl
name: Schneider, Donald P.
name: York, Donald G.
Publisher: name: arXiv
Year: 2010
Subjects: subject: Cosmology and Nongalactic Astrophysics (astro-ph.CO)
subject: FOS: Physical sciences

description: Quasars that allow the study of IGM He II are very rare, since they must be at high redshift along sightlines free of substantial hydrogen absorption, but recent work has dramatically expanded the number of such quasars known. We analyze two dozen higher-redshift (z=3.1-3.9) low-resolution He II quasar spectra from HST and find that their He II Gunn-Peterson troughs suggest exclusion of very early and very late reionization models, favoring a reionization redshift of z~3. Although the data quality is not sufficient to reveal details such as the expected redshift evolution of helium opacity, we obtain the first ensemble measure of helium opacity at high redshift averaged over many sightlines: tau=4.90 at z~3.3. We also find that it would be very difficult to observe the IGM red wing of absorption from the beginning of He II reionization, but depending on the redshift of reionization and the size of ionization zones, it might be possible to do so in some objects with the current generation of UV spectrographs.
description: ApJ accepted. 9 pages, 4 figures
Genome-wide epigenetic and genetic investigation of male infertility
Creators: name: Louie, Kenny
Publisher: name: University of British Columbia
Year: 2018

description: Genetic causes have been known to be involved in up to one-third of male infertility cases. Studies on the sperm and testis from infertile men have suggested that this population may also have higher rates of altered epigenetic modifications, particularly DNA methylation. Thus, we hypothesized that genetic and epigenetic causes may play a role together in male infertility. We used Sanger sequencing to observe the DNA methylation at imprinted differentially methylated regions– H19, IG-GTL2, and MEST – in the sperm of infertile men with oligozoospermia to assess the occurrence of alterations. We analyzed semen samples from fifty-three men (9 fertile and 44 infertile – stratified by sperm concentration). Although we observed altered cases in 13% (3/23) of men with severe oligozoospermia and none among controls, this finding was not significant. We genotyped the same men at the MTHFR C677T single nucleotide polymorphism (SNP) to determine whether this methyl supply gene is associated with DNA methylation in the sperm. We observed a trend that all altered cases had the CT genotype at this SNP and in the severe oligozoospermic subgroup, suggesting a combinatorial effect. Motivated from these findings, we conducted two genome-wide investigations to identify novel genes with DNA methylation alterations and/or SNPs relating to male infertility. We evaluated the genome-wide DNA methylation in the testis of twenty-four men (8 fertile and 16 infertile). Using predictive models, we identified 359 CpGs with altered DNA methylation among the infertile men. Of these loci and using functional analyses, we identified NDE1 which is a gene involved with cell cycle progression and centrosome formation. In the genome-wide SNP analysis of twenty men (13 fertile and 7 infertile), we identified 39 SNPs using machine learning models. Of these SNPs, candidates included MTR – a gene involved with the same folate pathway as MTHFR – and NIN which is a gene involved with proper chromosome segregation during cell division. In summary, we observed altered DNA methylation and SNPs in infertile men. We presented evidence that altered DNA methylation and changes in genetic sequence in genes involved with cell division and progression may impair spermatogenesis leading to male infertility.
He star evolutionary channel to intermediate-mass binary pulsar PSR J1802-2124
Creators: name: Chen, Wen-Cong
name: Li, Xiang-Dong
name: Xu, Ren-Xin
Publisher: name: arXiv
Year: 2011
Subjects: subject: High Energy Astrophysical Phenomena (astro-ph.HE)
subject: FOS: Physical sciences

description: The intermediate-mass binary pulsars (IMBPs) are characterized by relatively long spin periods (10 - 200 ms) and massive ($\ga 0.4 M_{\odot}$) white dwarf (WD) companions. Recently, precise mass measurements have been performed for the pulsar and the WD in the IMBP PSR J1802-2124. Some observed properties, such as the low mass of the pulsar, the high mass of the WD, the moderately long spin period, and the tight orbit, imply that this system has undergone a peculiar formation mechanism. In this work, we attempt to simulate the detailed evolutionary history of PSR J1802-2124. We propose that a binary system consisting of a neutron star (NS, of mass $1.3 M_{\odot}$) and an He star (of mass $1.0 M_{\odot}$), and with an initial orbital period of 0.5 d, may have been the progenitor of PSR J1802-2124. Once the He star overflows its Roche lobe, He-rich material is transferred onto the NS at a relatively high rate of $\sim 10^{-7}-10^{-6} M_{\odot}\,\rm yr^{-1}$, which is significantly higher than the Eddington accretion rate. A large amount of the transferred material is ejected from the vicinity of the NS by radiation pressure and results in the birth of a mildly recycled pulsar. Our simulated results are consistent with the observed parameters of PSR J1802-2124. Therefore, we argue that the NS + He star evolutionary channel may be responsible for the formation of most IMBPs with orbital periods $\la 3 \rm d$.
description: 4 pages, 3 figures, Astronomy and Astrophysics in press
Low-ionization galaxies and evolution in a pilot survey up to z = 1
Creators: name: Giraud, E.
name: Gu, Q. -S.
name: Melnick, J.
name: Quintana, H.
name: Selman, F.
name: Toledo, I.
name: Zelaya, P.
Publisher: name: arXiv
Year: 2010
Subjects: subject: Cosmology and Nongalactic Astrophysics (astro-ph.CO)
subject: FOS: Physical sciences

description: We present galaxy spectroscopic data on a pencil beam of $10.75' \times7.5'$ centered on the X-ray cluster RXJ0054.0-2823 at $z = 0.29$. We study the spectral evolution of galaxies from $z=1$ down to the cluster redshift in a magnitude-limited sample at $\rm R\leq23$, for which the statistical properties of the sample are well understood. We divide emission-line galaxies in star-forming galaxies, LINERs, and Seyferts by using emission-line ratios of [OII], $\rm Hβ$, and [OIII], and derive stellar fractions from population synthesis models. We focus our analysis on absorption and low-ionization galaxies. For absorption-line galaxies we recover the well known result that these galaxies have had no detectable evolution since $z\sim0.6-0.7$, but we also find that in the range $z=0.65-1$ at least 50% of the stars in bright absorption systems are younger than 2.5Gyr. Faint absorption-line galaxies in the cluster at $z = 0.29$ also had significant star formation during the previous 2-3Gyr, while their brighter counterparts seem to be composed only of old stars. At $z\sim0.8$, our dynamically young cluster had a truncated red-sequence. This result seems to be consistent with a scenario where the final assembly of E/S0 took place at $z<1$. In the volume-limited range $0.35\leq z\leq0.65$ we find that 23% of the early-type galaxies have LINER-like spectra with $\rm Hβ$ in absorption and a significant component of A stars. The vast majority of LINERs in our sample have significant populations of young and intermediate-aged stars and are thus not related to AGN, but to the population of `retired galaxies' recently identified by Cid-Fernandes et al. (2010) in the SDSS. Early-type LINERs with various fractions of A stars, and E+A galaxies appear to play an important role in the formation of the red sequence.
description: 26 pages, ; Accepted for publication in Research in Astronomy and Astrophysics
High-precision molecular dynamics simulation of UO2-PuO2: superionic transition in uranium dioxide
Creators: name: Potashnikov, S. I.
name: Boyarchenkov, A. S.
name: Nekrasov, K. A.
name: Kupryazhkin, A. Ya.
Publisher: name: arXiv
Year: 2011
Subjects: subject: Materials Science (cond-mat.mtrl-sci)
subject: Chemical Physics (physics.chem-ph)
subject: FOS: Physical sciences

description: Our series of articles is devoted to high-precision molecular dynamics simulation of mixed actinide-oxide (MOX) fuel in the rigid ions approximation using high-performance graphics processors (GPU). In this article we assess the 10 most relevant interatomic sets of pair potential (SPP) by reproduction of the Bredig superionic phase transition (anion sublattice premelting) in uranium dioxide. The measurements carried out in a wide temperature range from 300K up to melting point with 1K accuracy allowed reliable detection of this phase transition with each SPP. The λ-peaks obtained are smoother and wider than it was assumed previously. In addition, for the first time a pressure dependence of the λ-peak characteristics was measured, in a range from -5 GPa to 5 GPa its amplitudes had parabolic plot and temperatures had linear (that is similar to the Clausius-Clapeyron equation for melting temperature).
description: 7 pages, 6 figures, 1 table
Hydrogeology of the western Po plain (Piedmont, NW Italy)
Creators: name: De Luca, Domenico Antonio
name: Lasagna, Manuela
name: Debernardi, Laura
Publisher: name: Taylor & Francis
Year: 2020
Subjects: subject: 59999 Environmental Sciences not elsewhere classified
subject: FOS: Earth and related environmental sciences
subject: 69999 Biological Sciences not elsewhere classified
subject: FOS: Biological sciences
subject: 80699 Information Systems not elsewhere classified
subject: FOS: Computer and information sciences
subject: Science Policy

description: This paper describes the hydrogeological map of the western Po Plain, located in Piedmont (north-western Italy). Po plain represents a hydrogeological system of European relevance, and the Piedmont Plain is the most important groundwater reservoir of the Region. The 1:300,000 scale map was realised using previous and new data to update the knowledge of this area. The map provides information about the hydrogeological complexes and their type and degree of permeability, water table levels and depth, piezometric level fluctuation, lithostratigraphic cross-sections, thickness, and percentage of the permeable deposits between 0 and 50 m from the ground surface. All this information is essential to public administrations, stakeholders, researchers, and professionals for defining possible tools for groundwater protection and management and for planning new groundwater exploitation (i.e. municipal drinking water supplies).
Cosmological perturbation in f(R,G) theories with a perfect fluid
Creators: name: De Felice, Antonio
name: Gerard, Jean-Marc
name: Suyama, Teruaki
Publisher: name: arXiv
Year: 2010
Subjects: subject: Cosmology and Nongalactic Astrophysics (astro-ph.CO)
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: In order to classify modified gravity models according to their physical properties, we analyze the cosmological linear perturbations for f(R,G) theories (R being the Ricci scalar and G, the Gauss-Bonnet term) with a minimally coupled perfect fluid. For the scalar type perturbations, we identify in general six degrees of freedom. We find that two of these physical modes obey the same dispersion relation as the one for a non-relativistic de Broglie wave. This means that spacetime is either highly unstable or its fluctuations undergo a scale-dependent super-luminal propagation. Two other modes correspond to the degrees of freedom of the perfect fluid, and propagate with the sound speed of such a fluid. The remaining two modes correspond to the entropy and temperature perturbations of the perfect fluid, and completely decouple from the other modes for a barotropic equation of state. We then provide a concise condition on f(R,G) theories, that both f(R) and R+f(G) do fulfill, to avoid the de Broglie type dispersion relation. For the vector type perturbation, we find that the perturbations decay in time. For the tensor type perturbation, the perturbations can be either super-luminal or sub-luminal, depending on the model. No-ghost conditions are also obtained for each type of perturbation.
description: 12 pages, uses RevTeX
First-principles modeling of the interactions of iron impurities with graphene and graphite
Creators: name: Boukhvalov, Danil W.
Publisher: name: arXiv
Year: 2010
Subjects: subject: Materials Science (cond-mat.mtrl-sci)
subject: FOS: Physical sciences

description: Results of first principles modelling of interactions graphene and graphite with iron impurities predict the colossal difference between these two carbon allotropes. Insertion of the iron atoms between the planes of graphite is much more energetically favourable than adsorption of the iron adatom at graphite or graphene surface. High mobility of iron adatom over graphite surface and within bulk graphite is reported. Calculated values of formation energies for the substitutional iron impurities suggest that iron is more destructive for graphite than for graphene. This effect caused formation of uniform carbon environment of the iron atom inside the multilayer system. In contrast to graphene segregation of the substitutional iron impurities in graphite at the ambient conditions is not energetically favourable. Enhancement of interlayer bonding in contaminated graphite and purity of graphene from iron impurities are also reported.
description: 14 pages, 3 figures, to appear in phis. stat. solidi (b)
Performance of cross-laminated timber shear walls for platform construction under lateral loading
Creators: name: Shahnewaz, Md
Publisher: name: University of British Columbia
Year: 2018

description: Cross-laminated timber (CLT) is gaining popularity in residential and non-residential applications in the North American construction market. CLT is very effective in resisting lateral forces resulting from wind and seismic loads. This research investigated the in-plane performance of CLT shear wall for platform-type buildings under lateral loading. Analytical models were proposed to estimate the in-plane stiffness of CLT wall panels with openings based on experimental and numerical investigations. The models estimate the in-plane stiffness under consideration of panel thickness, aspect ratios, and size and location of the openings. A sensitivity analysis was conducted to reduce the number of model parameters to those that have a significant impact on the stiffness reduction of CLT wall panels with openings. Finite element models of CLT wall connections were developed and calibrated against experimental tests. The results were incorporated into models of CLT single and coupled shear walls. Finite element analyses were conducted on CLT shear walls and the results in terms of peak displacements, peak loads and energy dissipation were in good agreement when compared against full-scale shear wall tests. A parametric study on single and coupled CLT shear walls was conducted with variation of number and type of connectors. The seismic performance of 56-single and 40-coupled CLT shear walls’ assembles for platform-type construction were evaluated. Deflection formulas were proposed for both single and coupled CLT shear walls loaded laterally in-plane that in addition to the contributions of CLT panels and connections, also account for the influence of adjacent perpendicular walls and floors above and illustrated with examples. Analytical equations were proposed to calculate the resistance of CLT shear walls accounting for the kinematic behaviour of the walls observed in experimental investigations (sliding, rocking and combined sliding-rocking) and illustrated with examples. Different configurations (number and location of hold-downs) of single and coupled CLT walls were considered. The findings presented in this thesis will contribute to the scientific body of knowledge and furthermore will be a useful tool for practitioners for the successful seismic design of CLT platform buildings in-line with the current CSA O86 provisions.
The glacial geomorphology of the Río Corcovado, Río Huemul and Lago Palena/General Vintter valleys, northeastern Patagonia (43°S, 71°W)
Creators: name: Leger, Tancrède P. M.
name: Hein, Andrew S.
name: Bingham, Robert G.
name: Martini, Mateo A.
name: Soteres, Rodrigo L.
name: Sagredo, Esteban A.
name: Martínez, Oscar A.
Publisher: name: Taylor & Francis
Year: 2020
Subjects: subject: Pharmacology
subject: 59999 Environmental Sciences not elsewhere classified
subject: FOS: Earth and related environmental sciences
subject: Ecology
subject: FOS: Biological sciences
subject: 20199 Astronomical and Space Sciences not elsewhere classified
subject: FOS: Physical sciences
subject: Sociology
subject: FOS: Sociology
subject: 69999 Biological Sciences not elsewhere classified
subject: Cancer
subject: Computational Biology

description: This study presents the first detailed glacial geomorphological map of the sediment-landform assemblages formed by three eastern outlet glaciers of the former Patagonian Ice Sheet. These glaciers occupied the Río Corcovado, Río Huemul and Lago Palena/General Vintter valleys, Chubut province, Argentina (43°S, 71°W). By combining remote sensing and field-mapping, we build on previous ice-sheet scale mapping and geological surveys to provide high-resolution spatial information on local ice-contact glaciogenic, glaciofluvial, glaciolacustrine, and subglacial landforms. Twenty-five landform types, many of which are newly mapped in the region, were digitized as georeferenced shapefiles over a 5300 km2 area. This map enables the identification of former ice-flow directions, relative ice-margin positions and glaciofluvial drainage pathways for each preserved Quaternary glaciation. It also elucidates the former areal extent, geolocation and spillways of glaciolacustrine bodies formed during the last deglaciation. The map delivers an essential framework on which to build robust glacier-scale geomorphological and geochronological reconstructions.
Dipole responses in Nd and Sm isotopes with shape transitions
Creators: name: Yoshida, Kenichi
name: Nakatsukasa, Takashi
Publisher: name: arXiv
Year: 2010
Subjects: subject: Nuclear Theory (nucl-th)
subject: Nuclear Experiment (nucl-ex)
subject: FOS: Physical sciences

description: Photoabsorption cross sections of Nd and Sm isotopes from spherical to deformed even nuclei are systematically investigated by means of the quasiparticle-random-phase approximation based on the Hartree-Fock-Bogoliubov ground states (HFB+QRPA) using the Skyrme energy density functional. The gradual onset of deformation in the ground states as increasing the neutron number leads to characteristic features of the shape phase transition. The calculation well reproduce the isotopic dependence of broadening and emergence of a double-peak structure in the cross sections without any adjustable parameter. We also find that the deformation plays a significant role for low-energy dipole strengths. The $E1$ strengths are fragmented and considerably lowered in energy. The summed $E1$ strength up to 10 MeV is enhanced by a factor of five or more.
description: 5 pages including 6 figures
Menumbuhkan Minat Berwirausaha
Creators: name: Sisi Aquirera
Publisher: name: Zenodo
Year: 2022

description: TUGAS UAS MATA KULIAH KEWIRAUSAHAAN | MAKALAH INDIVIDU | "MENUMBUHKAN MINAT BERWIRAUSAHA" Sisi Aquirera ( 11812077 ) | Mahasiswa PBA Kelas 7C FTIK-IAIN PONTIANAK | Dosen Pengampu : Dr. H. Fachrurazi, S.Ag., MM dan Yulida, MM
Characterization of tails through hazard rate and convolution closure properties
Creators: name: Bardoutsos, Anastasios G.
name: Konstantinides, Dimitrios G.
Publisher: name: arXiv
Year: 2011
Subjects: subject: Probability (math.PR)
subject: FOS: Mathematics
subject: 60E05

description: We use the properties of the Matuszewska indices to show asymptotic inequalities for hazard rates. We discuss the relation between membership in the classes of dominatedly or extended rapidly varying tail distributions and corresponding hazard rate conditions. Convolution closure is established for the class of distributions with extended rapidly varying tails.
description: 8 pages
Mapping far-IR emission from the central kiloparsec of NGC 1097
Creators: name: Sandstrom, K.
name: Krause, O.
name: Linz, H.
name: Schinnerer, E.
name: Dumas, G.
name: Meidt, S.
name: Rix, H. -W.
name: Sauvage, M.
name: Walter, F.
name: Kennicutt, R. C.
name: Calzetti, D.
name: Appleton, P.
name: Armus, L.
name: Beirão, P.
name: Bolatto, A.
name: Brandl, B.
name: Crocker, A.
name: Croxall, K.
name: Dale, D.
name: Draine, B. T.
name: Engelbracht, C.
name: de Paz, A. Gil
name: Gordon, K.
name: Groves, B.
name: Hao, C. -N.
name: Helou, G.
name: Hinz, J.
name: Hunt, L.
name: Johnson, B. D.
name: Koda, J.
name: Leroy, A.
name: Murphy, E. J.
name: Rahman, N.
name: Roussel, H.
name: Skibba, R.
name: Smith, J. -D.
name: Srinivasan, S.
name: Vigroux, L.
name: Warren, B. E.
name: Wilson, C. D.
name: Wolfire, M.
name: Zibetti, S.
Publisher: name: arXiv
Year: 2010
Subjects: subject: Cosmology and Nongalactic Astrophysics (astro-ph.CO)
subject: FOS: Physical sciences

description: Using photometry of NGC 1097 from the Herschel PACS (Photodetector Array Camera and Spectrometer) instrument, we study the resolved properties of thermal dust continuum emission from a circumnuclear starburst ring with a radius ~ 900 pc. These observations are the first to resolve the structure of a circumnuclear ring at wavelengths that probe the peak (i.e. lambda ~ 100 micron) of the dust spectral energy distribution. The ring dominates the far-infrared (far-IR) emission from the galaxy - the high angular resolution of PACS allows us to isolate the ring's contribution and we find it is responsible for 75, 60 and 55% of the total flux of NGC 1097 at 70, 100 and 160 micron, respectively. We compare the far-IR structure of the ring to what is seen at other wavelengths and identify a sequence of far-IR bright knots that correspond to those seen in radio and mid-IR images. The mid- and far-IR band ratios in the ring vary by less than +/- 20% azimuthally, indicating modest variation in the radiation field heating the dust on ~ 600 pc scales. We explore various explanations for the azimuthal uniformity in the far-IR colors of the ring including a lack of well-defined age gradients in the young stellar cluster population, a dominant contribution to the far-IR emission from dust heated by older (> 10 Myr) stars and/or a quick smoothing of local enhancements in dust temperature due to the short orbital period of the ring. Finally, we improve previous limits on the far-IR flux from the inner ~ 600 pc of NGC 1097 by an order of magnitude, providing a better estimate of the total bolometric emission arising from the active galactic nucleus and its associated central starburst.
description: Accepted for publication in the A&A Herschel Special Edition
Decision Tree Classifiers for Star/Galaxy Separation
Creators: name: Vasconcellos, E. C.
name: de Carvalho, R. R.
name: Gal, R. R.
name: LaBarbera, F. L.
name: Capelato, H. V.
name: Velho, H. F. Campos
name: Trevisan, M.
name: Ruiz, R. S. R.
Publisher: name: arXiv
Year: 2010
Subjects: subject: Cosmology and Nongalactic Astrophysics (astro-ph.CO)
subject: Instrumentation and Methods for Astrophysics (astro-ph.IM)
subject: FOS: Physical sciences

description: We study the star/galaxy classification efficiency of 13 different decision tree algorithms applied to photometric objects in the Sloan Digital Sky Survey Data Release Seven (SDSS DR7). Each algorithm is defined by a set of parameters which, when varied, produce different final classification trees. We extensively explore the parameter space of each algorithm, using the set of $884,126$ SDSS objects with spectroscopic data as the training set. The efficiency of star-galaxy separation is measured using the completeness function. We find that the Functional Tree algorithm (FT) yields the best results as measured by the mean completeness in two magnitude intervals: $14\le r\le21$ ($85.2%$) and $r\ge19$ ($82.1%$). We compare the performance of the tree generated with the optimal FT configuration to the classifications provided by the SDSS parametric classifier, 2DPHOT and Ball et al. (2006). We find that our FT classifier is comparable or better in completeness over the full magnitude range $15\le r\le21$, with much lower contamination than all but the Ball et al. classifier. At the faintest magnitudes ($r>19$), our classifier is the only one able to maintain high completeness ($>$80%) while still achieving low contamination ($\sim2.5%$). Finally, we apply our FT classifier to separate stars from galaxies in the full set of $69,545,326$ SDSS photometric objects in the magnitude range $14\le r\le21$.
description: Submitted to AJ
Geomorphology and surface geology of Mount St. Helens volcano
Creators: name: Gabrielli, S.
name: Spagnolo, M.
name: De Siena, L.
Publisher: name: Taylor & Francis
Year: 2020
Subjects: subject: 29999 Physical Sciences not elsewhere classified
subject: FOS: Physical sciences
subject: 59999 Environmental Sciences not elsewhere classified
subject: FOS: Earth and related environmental sciences
subject: 20199 Astronomical and Space Sciences not elsewhere classified
subject: 69999 Biological Sciences not elsewhere classified
subject: FOS: Biological sciences
subject: Cancer
subject: Inorganic Chemistry
subject: FOS: Chemical sciences

description: Mount St. Helens is a stratovolcano of the Cascadia volcanic arc well known worldwide for its volcanic collapse and eruption in 1980, which caused considerable destruction and changed the geomorphology of the volcano and of a considerable portion of its surroundings. This paper presents a geomorphology and surface-geology map of both the wider Mount St. Helens, Washington (USA), at the 1:50,000 scale, and of its crater, at the 1:25,000 scale. The map is obtained from the interpretation of two high-resolution, air-borne acquired, digital terrain models, LiDAR dataset, combined with Google Earth imaging, geological information and field surveys. The geomorphology of the area is largely dominated by landforms connected with the blast of 1980 and the dome extrusion of 2004, which also affected the shape of the main glacier in the crater.
Roles of deformation and neutron excess on the giant monopole resonance in neutron-rich Zr isotopes
Creators: name: Yoshida, Kenichi
Publisher: name: arXiv
Year: 2010
Subjects: subject: Nuclear Theory (nucl-th)
subject: FOS: Physical sciences

description: We investigate the roles of deformation on the giant monopole resonance (GMR), particularly the mixing of the giant quadrupole resonance (GQR) and the effects of the neutron excess in the well-deformed nuclei around $^{110}$Zr and in the drip-line nuclei around $^{140}$Zr by means of the deformed quasiparticle-random-phase-approximation employing the Skyrme and the local pairing energy-density functionals. It is found that the isoscalar (IS) GMR has a two-peak structure, the lower peak of which is associated with the mixing between the ISGMR and the $K^π=0^{+}$ component of the ISGQR. The transition strengths of the lower peak of the ISGMR grows as the neutron number increases. In the drip-line nuclei, the neutron excitation is dominant over the proton excitation. We find for an isovector (IV) excitation the GMR has a four-peak structure due to the mixing of the IS and IV modes as well as the mixing of the $K^π=0^{+}$ component of the IVGQR. Besides the GMR, we find the threshold strength generated by neutrons only.
description: 6 pages including 3 figures and 2 tables
Soil types of Aosta Valley (NW-Italy)
Creators: name: D’Amico, M. E.
name: Pintaldi, E.
name: Sapino, E.
name: Colombo, N.
name: Quaglino, E.
name: Stanchi, S.
name: Navillod, E.
name: Rocco, R.
name: Freppaz, M.
Publisher: name: Taylor & Francis
Year: 2020
Subjects: subject: 59999 Environmental Sciences not elsewhere classified
subject: FOS: Earth and related environmental sciences
subject: 39999 Chemical Sciences not elsewhere classified
subject: FOS: Chemical sciences
subject: Ecology
subject: FOS: Biological sciences
subject: 69999 Biological Sciences not elsewhere classified
subject: 80699 Information Systems not elsewhere classified
subject: FOS: Computer and information sciences
subject: Plant Biology

description: The first soil map of the whole Aosta Valley Region was produced at the 1:100,000 scale. We used 691 soil profiles, attributed to 16 Cartographic (soil) Units, spatialized using a Maximum Likelihood Estimation model available in ArcGIS software. Six maps were used as base layers, representing the most important soil-forming factors: parent material, vegetation/land use, mean annual precipitation, elevation, absolute aspect and slope angle. The Maximum Likelihood Estimation was followed by an expert-based check that led to a re-assignment of some wrongly attributed cartographic polygons. The validation process revealed that the User’s and Producer’s Accuracies were rather high (between 47.5% and 84.4% for common soil types). A particularly high pedodiversity, associated to strong geological, vegetational and climatic gradients was observed.
The nodal structure of doubly-excited resonant states of helium
Creators: name: Rost, J.
name: Gersbacher, R.
name: Richter, Klaus
name: Briggs, J.
name: Wintgen, Dieter
Publisher: name: Universität Regensburg
Year: 1991
Subjects: subject: 530 Physik

description: The authors examine the nodal structure of accurate helium wavefunctions calculated by direct diagonalization of the full six-dimensional problem. It is shown that for fixed interelectronic distance R (or hyperspherical radius R) the symmetric doubly-excited resonant states have well defined lambda , mu nodal structure indicating a near separability in prolate spheroidal coordinates. For fixed lambda , however, a clear mixing of R, mu nodes is demonstrated. This corresponds to a breakdown of the adiabatic approximation and can be understood in terms of the classical two-electron motion.
Matter and Interactions: a particle physics perspective
Creators: name: Organtini, Giovanni
Publisher: name: arXiv
Year: 2011
Subjects: subject: Popular Physics (physics.pop-ph)
subject: High Energy Physics - Phenomenology (hep-ph)
subject: FOS: Physical sciences

description: In classical mechanics matter and fields are completely separated. Matter interacts with fields. For particle physicists this is not the case. Both matter and fields are represented by particles. Fundamental interactions are mediated by particles exchanged between matter particles. In this paper we explain why particle physicists believe in such a picture, introducing the technique of Feynman diagrams starting from very basic and popular analogies with classical mechanics, making the physics of elementary particles comprehensible even to high school students, the only prerequisite being the knowledge of the conservation of mechanical energy.
description: 14 pages, 6 figures, Lecture given to degree students other than physicists during outreach seminars. Vers. 2 has better figure placement and an acknowledge section, as well as corrections in the bibliograhy