cometadata/datacite-rtg-text-other-reclassification-records huggingface dataset:
Fast calculation of capacitances in silicon sensors with 3D and 2D numerical solutions of the Laplace's equation and comparison with experimental data and TCAD simulations
Creators: name: Assiouras, P.
name: Asenov, P.
name: Kyriakis, A.
name: Loukas, D.
Publisher: name: arXiv
Year: 2020
Subjects: subject: Instrumentation and Detectors (physics.ins-det)
subject: High Energy Physics - Experiment (hep-ex)
subject: FOS: Physical sciences

description: We have developed a software for fast calculation of capacitances in planar silicon pixel and strip sensors, based on 3D and 2D numerical solutions of the Laplace's equation. The validity of the 2D calculations was checked with capacitances measurements on Multi-Geometry Silicon Strip Detectors (MSSD). The 3D calculations were tested by comparison with pixel sensors capacitance measurements from literature. In both cases the Laplace equation results were compared with simulations obtained from the TCAD Sentaurus suite. The developed software is a useful tool for fast estimation of interstrip, interpixel and backplane capacitances, saving computation time, as a first approximation before using a more sophisticated platform for more accurate results if needed.
Multiple, weak hits confuse complex systems: A transcriptional regulatory network as an example
Creators: name: Agoston, Vilmos
name: Csermely, Peter
name: Pongor, Sandor
Publisher: name: arXiv
Year: 2004
Subjects: subject: Molecular Networks (q-bio.MN)
subject: Genomics (q-bio.GN)
subject: FOS: Biological sciences

description: Robust systems, like the molecular networks of living cells are often resistant to single hits such as those caused by high-specificity drugs. Here we show that partial weakening of the Escherichia coli and Saccharomyces cerevisiae transcriptional regulatory networks at a small number (3-5) selected nodes can have a greater impact than the complete elimination of a single selected node. In both cases, the targeted nodes have the greatest possible impact; still the results suggest that in some cases broad specificity compounds or multitarget drug therapies may be more effective than individual high-affinity, high-specificity ones. Multiple but partial attacks mimic well a number of in vivo scenarios and may be useful in the efficient modification of other complex systems.
description: 8 pages, 3 figures, 2 tables
Two atoms in an anisotropic harmonic trap
Creators: name: Idziaszek, Z.
name: Calarco, T.
Publisher: name: arXiv
Year: 2004
Subjects: subject: Quantum Physics (quant-ph)
subject: FOS: Physical sciences

description: We consider the system of two interacting atoms confined in axially symmetric harmonic trap. Within the pseudopotential approximation, we solve the Schroedinger equation exactly, discussing the limits of quasi-one and quasi-two-dimensional geometries. Finally, we discuss the application of an energy-dependent pseudopotential, which allows to extend the validity of our results to the case of tight traps and large scattering lengths.
description: RevTeX 4 pages, 2 figures
An extended $R^{(2)}_{Ψ_m}(ΔS_2)$ correlator for detecting and characterizing the Chiral Magnetic Wave
Creators: name: Magdy, Niseem
name: Nie, Mao-Wu
name: Huang, Ling
name: Ma, Guo-Liang
name: Lacey, Roy. A.
Publisher: name: arXiv
Year: 2020
Subjects: subject: Nuclear Experiment (nucl-ex)
subject: High Energy Physics - Experiment (hep-ex)
subject: High Energy Physics - Phenomenology (hep-ph)
subject: Nuclear Theory (nucl-th)
subject: FOS: Physical sciences

description: The extended $R^{(2)}_{Ψ_{m}}(ΔS_{2})$ correlator is presented and examined for its efficacy to detect and characterize the quadrupole charge separation ($ΔS_{2}$) associated with the purported Chiral Magnetic Wave (CMW) produced in heavy-ion collisions. Sensitivity tests involving varying degrees of proxy CMW signals injected into events simulated with the Multi-Phase Transport Model (AMPT), show that the $R^{(2)}_{Ψ_{m}}(ΔS_{2})$ correlator provides discernible responses for the background- and CMW-driven charge separation. This distinction could aid identification of the CMW via measurements of the $R^{(2)}_{Ψ_{2}}(ΔS_{2})$ and $R^{(2)}_{Ψ_{3}}(ΔS_{2})$ correlators, relative to the second- ($Ψ_2$) and third-order ($Ψ_3$) event planes. The tests also indicate a level of sensitivity that would allow for robust experimental characterization of the CMW signal.
description: 7 pages 5 figures - submitted for publication
BRST approach to Lagrangian construction for fermionic massless higher spin fields
Creators: name: Buchbinder, I. L.
name: Krykhtin, V. A.
name: Pashnev, A.
Publisher: name: arXiv
Year: 2004
Subjects: subject: High Energy Physics - Theory (hep-th)
subject: FOS: Physical sciences

description: We develop the BRST approach to Lagrangian formulation for all massless half-integer higher spin fields on an arbitrary dimensional flat space. General procedure of Lagrangian construction describing the dynamics of fermionic field with any spin is given. It is shown that in fermionic case the higher spin field model is a reducible gauge theory and the order of reducibility grows with the value of spin. No off-shell constraints on the fields and the gauge parameters are used. We prove that in four dimensions after partial gauge fixing the Lagrangian obtained can be transformed to Fang-Fronsdal form however, in general case, it includes the auxiliary fields and possesses the more gauge symmetries in compare with Fang-Fronsdal Lagrangian. As an example of general procedure, we derive the new Lagrangian for spin 5/2 field containing all set of auxiliary fields and gauge symmetries of free fermionic higher spin field theory.
description: 24 pages; v4: Minor corrections, added references, version accepted for publication in NPB
Model-Independent Determination of CP Violation from Angular Distributions in Higgs Boson Decays to WW and ZZ at the Photon Collider
Creators: name: Niezurawski, P.
name: Zarnecki, A. F.
name: Krawczyk, M.
Publisher: name: arXiv
Year: 2004
Subjects: subject: High Energy Physics - Phenomenology (hep-ph)
subject: FOS: Physical sciences

description: The model-independent determination of the Higgs-boson CP properties at the Photon Collider at TESLA has been studied in detail, for masses between 200 and 350 GeV, using realistic luminosity spectra and detector simulation. We consider a generic model with the CP violating Higgs tensor couplings to gauge bosons. We introduce a new variable describing angular distributions of the secondary WW and ZZ decay products which is very sensitive to the CP properties of the Higgs-boson. Understanding of the detector performance turns out to be crucial, as the influence of the acceptance corrections is similar to the effects of CP violation. From the combined measurement of invariant mass distributions and various angular distributions the phase describing a CP violation can be determined to about 50 mrad after one year of Photon Collider running.
description: 10 pages, 8 figures
Utvecklingsprogram för kollegialt lärande – Samundervisning med utvärdering och kollegiala samtal
Creators: name: Blomström, Vendela
name: Nobel, Eva
name: Wennerberg, Jeanna
Publisher: name: Stockholm University Open Educational Resources
Year: 2020
Subjects: subject: 130304 Educational Administration, Management and Leadership
subject: FOS: Educational sciences

description: Här presenteras arbetsmaterialet till ett utvecklingsprogram för kollegialt lärande med särskilda mallar för samundervisning, utvärdering och kollegiala samtal.

Materialet är framtaget och utprövat i ett stort lärarlag under ett år vid Institutionen för svenska och flerspråkighet på Stockholms universitet. Vår erfarenhet är att om man arbetar med förhållandevis enkla mallar så blir samundervisningen mer strukturerad både i fråga om förberedelse och om uppföljning. Dessutom blir det ofta lättare att ge konstruktiv kritik när man har mallar att utgå från i utvärderingssituationen.

Detta material för samundervisning ingår som en av tre delar i ett utvecklingsprogram för kollegialt lärande som består av auskultationer, samundervisning och kollegiala samtal. För den del som gäller auskultationer med återkoppling och kollegiala samtal finns utförlig beskrivning av genomförandet, presentation av några resultat samt själva arbetsmaterialet i publikationerna nedan.
Relations Between Timing Features and Colors in Accreting Millisecond Pulsars
Creators: name: van Straaten, Steve
name: van der Klis, Michiel
name: Wijnands, Rudy
Publisher: name: arXiv
Year: 2004
Subjects: subject: Astrophysics (astro-ph)
subject: FOS: Physical sciences

description: We have studied the aperiodic X-ray timing and color behavior of the accreting millisecond pulsars SAX J1808.4-3658, XTE J1751-305, XTE J0929-314, and XTE J1814-338 using large data sets obtained with the Rossi X-ray Timing Explorer. We find that the accreting millisecond pulsars have very similar timing properties to the atoll sources and the low luminosity bursters. Based on the correlation of timing and color behavior SAX J1808.4-3658 can be classified as an atoll source, and XTE J0929-314 and XTE J1814-338 are consistent with being atoll sources, but the color behavior of XTE J1751-305 is different. Unlike in other atoll sources the hard color in the extreme island state of XTE J1751-305 is strongly correlated with soft color and intensity, and is not anti-correlated with any of the characteristic frequencies. We found previously, that the frequencies of the variability components of atoll sources follow a universal scheme of correlations. The frequency correlations of the accreting millisecond pulsars are similar, but in the case of SAX J1808.4-3658 and XTE J0929-314 shifted compared to those of the other atoll sources in a way that is most easily described as a shift in upper and lower kilohertz QPO frequency by a factor close to 1.5. Although, we note that the shift in lower kilohertz QPO frequency is based on only one observation for SAX J1808.4-3658. XTE J1751-305 and XTE J1814-338, as well as the low luminosity bursters show no or maybe small shifts.
description: 46 pages, 23 figures, ApJ accepted
The local atomic quasicrystal structure of the icosahedral Mg25Y11Zn64 alloy
Creators: name: Bruehne, S.
name: Uhrig, E.
name: Gross, C.
name: Assmus, W.
name: Masadeh, A. S.
name: Billinge, S. J. L.
Publisher: name: arXiv
Year: 2004
Subjects: subject: Materials Science (cond-mat.mtrl-sci)
subject: FOS: Physical sciences

description: A local and medium range atomic structure model for the face centred icosahedral (fci) Mg25Y11Zn64 alloy has been established in a sphere of r = 27 A. The model was refined by least squares techniques using the atomic pair distribution (PDF) function obtained from synchrotron powder diffraction. Three hierarchies of the atomic arrangement can be found: (i) five types of local coordination polyhedra for the single atoms, four of which are of Frank-Kasper type. In turn, they (ii) form a three-shell (Bergman) cluster containing 104 atoms, which is condensed sharing its outer shell with its neighbouring clusters and (iii) a cluster connecting scheme corresponding to a three-dimensional tiling leaving space for few glue atoms. Inside adjacent clusters, Y8-cubes are tilted with respect to each other and thus allow for overall icosahedral symmetry. It is shown that the title compound is essentially isomorphic to its holmium analogue. Therefore fci-Mg-Y-Zn can be seen as the representative structure type for the other rare earth analogues fci-Mg-Zn-RE (RE = Dy, Er, Ho, Tb) reported in the literature.
description: 12 pages, 8 figures, 2 tables
title: The effect of environmental and social factors on the courtship and mating dynamics of the smooth newt, Triturus v. vulgaris
Creators: name: Kauffmann, Juliet Laura Dare
Publisher: name: The Open University
Year: 1998

description: The effect of environmental and social factors on the courtship and mating dynamics of the smooth newt. Triturus v. vulgaris, was studied using laboratory experiments, an individual-based model, a semi-natural population and a field study. In view of the limitations of laboratory experiments and field observation, the semi-natural and modelling approaches are recommended as additional research tools. In the laboratory, the optimal temperature for spermatophore transfer was just below 13°C, at which point the spermatophore deposition rate is high and oxygen availability not limiting. In the wild females determine the timing of mating. They are highly receptive for a brief period after arrival at the breeding site (early spring), subsequently re-mating only sporadically. Therefore, few courtships take place at mid-season, optimal temperatures. In the semi-natural population. deposition occurred in only 3 - 6% of courtships with a median of one deposition per encounter. Male mating success is therefore unlikely to be constrained by physiological capacity for spermatophore production. Female receptivity and immigration patterns are thus the principle determinants of the operational sex ratio (OSR). According to the model, a male-biased OSR develops rapidly at the start of the season, but the strength of bias will depend on the breeding sex ratio. duration of the arrival period and extent to which males arrive before females. The OSR influences the intensity of competition for mates and the potential for sexual selection. Males compete directly for females by sexual interference, a common but low-gain strategy. Males may also compete indirectly by courting unmated and unfamiliar females preferentially (both of which have a higher probability of being receptive) although more research is needed to establish if males differ in their ability to find receptive females. There is variance in male mating success but the relative contributions of environmental factors and phenotypic traits needs further clarification.
Volumen maderable de mangle negro (Avicennia germinans L.) impactado por herbivoria de Anacamptodes sp en Cárdenas Tabasco.
Creators: name: Sol-Sánchez, Ángel
name: Sánchez-Gutiérrez, Facundo
name: Hernández-Melchor, Gloria Isela
name: Zamora Cornelio, Luis Felipe
name: Sardiñas-Gómez, Oreste
name: Rivera, Carlos
name: Toruño, Pedro José
name: Sol-Sánchez, Ángel
name: Sánchez-Gutiérrez, Facundo
name: Hernández-Melchor, Gloria Isela
name: Zamora Cornelio, Luis Felipe
name: Sardiñas-Gómez, Oreste
name: Rivera, Carlos
name: Toruño, Pedro José
Publisher: name: Unknown
Year: 2015
Subjects: subject: Environmental Economics and Policy
subject: Resource /Energy Economics and Policy
subject: Volumen maderable
subject: Anacamptodes
subject: Mangle negro
subject: herbivoría

description: El presente trabajo se realizó en el ejido las coloradas, Cárdenas, Tabasco, con el objetivo de cuantificar el volumen maderable del mangle negro (Avicennia germinans (L.) L., afectado y muerto por la oruga de Anacamptodes sp., durante 2010-2011. Se establecieron 10 unidades de muestreo (UM) de forma rectangular de 20 x 50 m para evaluación permanente. Se registró el estado sanitario de los árboles, el diámetro a la altura del pecho (DAP 13 m), la altura total y altura del fuste limpio (Ht y Hfl). Se calculó el área basal (AB m2ha-1), Volumen total y del fuste limpio (Vt y Vfl m3ha-1) y se estimó la densidad de árboles por especie. Los valores obtenidos se arreglaron en clases diamétricas con una amplitud de 5 cm. Se realizó un análisis de correlación lineal simple entre la altura y el DAP. En total se evaluaron 1,831 árboles de tres especies, tres géneros y tres familias botánicas. El mangle negro representó 99.6% del total de árboles evaluados; la densidad varió de 750 hasta 2,520 árboles por ha-1. El 42.9% de los árboles registrados mostraban partes vivas y el 57.1% estaban totalmente muertos. Específicamente, el mangle negro registró un Vt de 68.3 m3 ha-1, Vfl de 24.6 m3 ha-1y un AB de 12.4 m2 ha-1. La categoría de 5 - 9.9 cm de DAP registró el 45% de los árboles identificados. La correlación del DAP y la altura del mangle negro, fue moderada positiva significativa (r² = 0.5313, p = 2.2 e-16).
On the dynamical 4D BTZ black hole solution in conformally invariant gravity
Creators: name: Slagter, Reinoud Jan
Publisher: name: arXiv
Year: 2020
Subjects: subject: General Relativity and Quantum Cosmology (gr-qc)
subject: High Energy Physics - Theory (hep-th)
subject: FOS: Physical sciences

description: We review the (2+1)-dimensional Baunados-Teitelboim-Zanelli black hole solution in conformally invariant gravity, uplifted to (3+1)-dimensional spacetime. As matter content we use a scalar-gauge field. The metric is written as $g_{μν}=ω^2\tilde g_{μν}$, where the {\it dilaton field} $ω$ contains all the scale dependencies and where $\tilde g_{μν}$ represents the "un-physical" spacetime. A numerical solution is presented and shows how the dilaton can be treated on equal footing with the scalar field. The location of the apparent horizon and ergo-surface depends critically on the parameters and initial values of the model. It is not a hard task to find suitable initial parameters in order to obtain a regular and {\it singular free} $g_{μν}$ out of a BTZ-type solution for $\tilde g_{μν}$. In the vacuum situation, an {\it exact} time-dependent solution in the Eddington-Finkelstein coordinates is found, which is valid for the (2+1)-dimensional BTZ spacetime as well as for the uplifted (3+1)-dimensional BTZ spacetime. While $\tilde g_{μν}$ resembles the standard BTZ solution with its horizons, $g_{μν}$ is {\it flat}. The dilaton field becomes an infinitesimal renormalizable quantum field, which switches on and off Hawking radiation. This solution can be used to investigate the small distance scale of the model and the black hole complementarity issues. It can also be used to describe the problem how to map the quantum states of the outgoing radiation as seen by a distant observer and the ingoing by a local observer in a one-to-one way. The two observers will use a different conformal gauge. A possible connection is made with the antipodal identification and unitarity issues.
description: Version V4; some minor correction. 3 more figures added. Comment very welcome! 26 figures. 16 pages
Realization of an N-shaped IVC of nanoscale metallic junctions using the antiferromagnetic transition
Creators: name: Naidyuk, Yu. G.
name: Gloos, K.
name: Yanson, I. K.
Publisher: name: arXiv
Year: 2004
Subjects: subject: Mesoscale and Nanoscale Physics (cond-mat.mes-hall)
subject: Materials Science (cond-mat.mtrl-sci)
subject: FOS: Physical sciences

description: We have observed at low temperatures (<8K) hysteretic I(V) characteristics for sub-mkm (~200nm) metallic break-junctions based on the heavy-fermion compound UPd2Al3. Degrading the quality of the contacts by in situ increasing the local residual resistivity or temperature rise reduces the hysteresis. We demonstrate that those hysteretic I(V) curves can be reproduced theoretically by assuming the constriction to be in the thermal regime. Our calculations show that such anomalous I(V) curves are due to the sharp increase of ρ(T) of UPd2Al3 near the Neel temperature T_N ~ 14K. From this point of view each metal with similar ρ(T) should produce similar hysteretic I(V) curves. As example we show calculations for the rare-earth manganite La{0.75}Sr{0.25}MnO3, a system with colossal magnetoresistance. In this way we demonstrate that nano-sized point contacts can be non-linear devices with N-shaped I(V) characteristics, i. e. with negative differential resistance, that could serve like Esaki tunnel diodes or Gunn diodes as amplifiers, generators, and switching units. Their characteristic response time is estimated to be less than 1ns for the investigated contacts.
description: 4 pages, 2 figs, presented on NATO ARW “Nanoscale Devices – Fundamentals and Applications” (18-22 Sept. 2004, Kishinev, Moldova)
Customer Relationship Management in India: An empirical analysis of implementation of selected industries
Creators: name: Muramalla, Venkata Sai Srinivasa Rao
Publisher: name: figshare
Year: 2020
Subjects: subject: 140207 Financial Economics
subject: FOS: Economics and business
subject: 140210 International Economics and International Finance

description: CRM in India
The protective effect of blackberry anthocyanins against free radical-induced oxidation and cytotoxicity in multiple cell lines
Creators: name: Elisia, Ingrid
Publisher: name: University of British Columbia
Year: 2010

description: Anthocyanins are the blue and red pigments found in berries, with known antioxidant properties that may be associated with several health benefits, such as a reduction in the risk of heart disease and cancer. Blackberry in particular, is a rich source of anthocyanins and has notable antioxidant activity. Although the antioxidant capacity of anthocyanins has been well established in cell free in vitro system, there is very little evidence that links this antioxidant activity with protection against free radical associated oxidative damage in biological systems. The ultimate goal of this thesis, therefore, was to evaluate the protective effect of blackberry anthocyanins against free radical-induced oxidative stress and the resulting cytotoxicity using multiple cultured cell lines. Anthocyanins of both crude blackberry extracts as well as an anthocyanin enriched fraction were identified and quantified using HPLC. Different cytotoxicity assays (MTT, CellTiterGlo, BrdU) were validated against cell counting method to determine the most appropriate cytotoxicity assay(s) for the evaluation of blackberry anthocyanins in cultured cells. The effect of blackberry anthocyanins were individually evaluated in five distinct cell lines: two breast cancer lines (MDA-MB-453 and MCF-7), two intestinal cell lines (Caco-2 and INT-407), and one prostate cancer cell line (LNCaP), using M T T and CellTiter-Glo assay. In other tests, AAPH (2, 2' -azobis (2-amidinopropane) dihydrochloride), a free radical generator, was used to initiate intracellular oxidation and induce cytotoxicity. The effect of the blackberry extracts against AAPH initiated intracellular oxidation was monitored with a dichlorofluorescin diacetate (DCFH-DA) probe. The protective effect of blackberry anthocyanins against AAPH-induced cytotoxicity was measured with MTT and CellTiterGlo assays. Cell cycle analysis was also performed to determine possible protective mechanisms of blackberry anthocyanins against free radical associated damages. Cyanidin-3-glucoside was found to be the major anthocyanin (85 %) in blackberry. Blackberry anthocyanins were demonstrated to have no cytotoxic properties at physiological concentration. In addition, blackberry anthocyanins were found to suppress AAPH-initiated intracellular oxidation. This effect corresponded a protection effect against free radical-induced cytotoxicity. Cell cycle analysis with propidium iodide staining demonstrated that blackberry anthocyanins prevented cytotoxicity by scavenging the generated peroxyl radicals, thus alleviating AAPH-induced apoptosis.
Van der Waals thin films of WTe2 for natural hyperbolic plasmonic surfaces
Creators: name: Wang, Chong
name: Huang, Shenyang
name: Xing, Qiaoxia
name: Xie, Yuangang
name: Song, Chaoyu
name: Wang, Fanjie
name: Yan, Hugen
Publisher: name: arXiv
Year: 2020
Subjects: subject: Mesoscale and Nanoscale Physics (cond-mat.mes-hall)
subject: Optics (physics.optics)
subject: FOS: Physical sciences

description: A hyperbolic plasmonic surface supports highly directional propagating polaritons with extremely large density of states. Such plasmon polaritons have been realized in artificially structured metasurfaces. However, the upper bound of the achievable plasmon wave vector is limited by the structure size, which calls for a natural hyperbolic surface without any structuring. Here, we experimentally demonstrate a natural hyperbolic plasmonic surface based on thin films of WTe2 in the light wavelength range of 16 to 23 microns by far infrared absorption spectroscopy. The topological transition from the elliptic to the hyperbolic regime is further manifested by mapping the iso-frequency contours of the plasmon. Moreover, the anisotropy character and plasmon frequency exhibit prominent temperature dependence. Our study demonstrates the first natural platform to host 2D hyperbolic plasmons, which opens exotic avenues for the manipulation of plasmon propagation, light-matter interaction and light emission in planar photonics.
description: 25pages, 5figures
KOMBINATSIYALASHGAN AGREGAT PUSHTA OLGICHNING  RAMADA JOYLASHISHININ ASOSLASH BO'YICHA OLIB BORILGAN TADQIQOTLAR
Creators: name: Xudoyarov, A.N.
name: Abdimominov, I.I.
name: Yuldasheva, M.A.
name: Axmadjonov, R.
name: Abobakirov, R.
Publisher: name: Zenodo
Year: 2024

description: Maqolada kombinatsiyalashgan agregat pushta olgichning  ramada joylashishinin asoslash bo‘yicha olib borilgan tadqiqot natijalari keltirilgan. Olingan natijalarga asosan kam energiya sarflangan holda qo‘yilgan agrotexnika talablari darajasidagi  pushtalarni olish uchun pushta olgichning yumshatkichga nisbatan bo‘ylama yo‘nalishda o‘rnatilish masofasi kamida 600 mm bo‘lishi lozimligi aniqlangan.
Two-dimensional gapless spin liquids in frustrated SU(N) quantum magnets
Creators: name: Li, Peng
name: Shen, Shun-Qing
Publisher: name: arXiv
Year: 2004
Subjects: subject: Strongly Correlated Electrons (cond-mat.str-el)
subject: FOS: Physical sciences

description: A class of the symmetrically frustrated SU(N) models is constructed for quantum magnets based on the generators of SU(N) group. The total Hamiltonian lacks SU(N) symmtry. A mean field theory in the quasi-particle representation is developed for spin liquid states. Numerical solutions in two dimension indicate that the ground states are gapless and the quasi-particles are Dirac particles. The mechanism may be helpful in exploring the spin liquid phases in the spin-1 bilinear-biquadratic model and the spin-orbital model in higher dimensions.
description: 9 pages, 3 figures, to appear in New Journal of Physics
MODELO DE INDI-CADORES DE VULNERABILIDAD AL CAMBIO CLIMÁTICO Y SU REPRESENTACIÓN ESPACIAL EN LA REGIÓN CENTRO-GOLFO DE MÉXICO
Creators: name: Zerecero-Salazar, Brenda Carolina
name: Ibarrarán-Viniegra, María Eugenia
name: Gómez-Guerrero, Armando
name: Hernández-De La Rosa, Patricia
name: González-Guillén, Manuel De Jesús
name: Escalona-Maurice, Miguel Jorge
name: Sardiñas-Gómez, Oreste
name: Rivera, Carlos
name: Toruño, Pedro José
name: Zerecero-Salazar, Brenda Carolina
name: Ibarrarán-Viniegra, María Eugenia
name: Gómez-Guerrero, Armando
name: Hernández-De La Rosa, Patricia
name: González-Guillén, Manuel De Jesús
name: Escalona-Maurice, Miguel Jorge
name: Sardiñas-Gómez, Oreste
name: Rivera, Carlos
name: Toruño, Pedro José
Publisher: name: Unknown
Year: 2015
Subjects: subject: Environmental Economics and Policy
subject: Resource /Energy Economics and Policy
subject: extreme climatic events
subject: natural events risk
subject: adaptation capacity
subject: social and economical indices.

description: The Climate Change (CC) subject is still questionable, but the assessment of vulnerability to extreme events is critical for a strategic use of public resources. The most recent example is the impacts of “Ingrid” and “Manuel” cyclones, which would have been minimized with a previous evaluation of vulnerability in past years. This paper evaluated the vulnerability to CC in a transect from central Mexico to the Gulf, along the common direction followed by cyclones. Adapting the Malone and Brenkert (2008) model, social, economic, biophysics, and climatic variables were used to assest vulnerability. The most important sub-criteria for CC vulnerability are population size, poverty, production technology, natural resources degradation and economic capacity. Results were similar when variables were weighted according the opinion of experts. The adapted model showed to be a valuable planning tool that allows the planning of public resources according with vulnerability and minimize the extreme climatic events impacts.
Exact Solutions of the Duffin Kemmer Petiau Equation for the Deformed Hulthen Potential
Creators: name: Yasuk, Fevziye
name: Berkdemir, Cuneyt
name: Berkdemir, Ayse
name: Onem, Coskun
Publisher: name: arXiv
Year: 2004
Subjects: subject: Quantum Physics (quant-ph)
subject: FOS: Physical sciences

description: Using the Nikiforov Uvarov method, an application of the relativistic Duffin Kemmer Petiau equation in the presence of a deformed Hulthen potential is presented for spin zero particles. We derived the first order coupled differential radial equations which enable the energy eigenvalues as well as the full wavefunctions to be evaluated by using of the Nikiforov Uvarov method that can be written in terms of the hypergeometric polynomials.
description: 8 pages. submitted to Physica Scripta
Diffuse LINER-type emission from extended disc regions of barred galaxies
Creators: name: Percival, S. M.
name: James, P. A.
Publisher: name: arXiv
Year: 2020
Subjects: subject: Astrophysics of Galaxies (astro-ph.GA)
subject: FOS: Physical sciences

description: We present a spectroscopic analysis of the central disc regions of barred spiral galaxies, concentrating on the region that is swept by the bar but not including the bar itself (the `Star Formation Desert' or SFD region). New spectroscopy is presented for 34 galaxies, and the full sample analysed comprises 48 SBa - SBcd galaxies. These data confirm the full suppression of star formation within the SFD regions of all but the latest type (SBcd) galaxies. However, diffuse [NII] and H alpha line emission is detected in all galaxies. The ubiquity and homogeneous properties of this emission from SBa - SBc galaxies favour post-Asymptotic Giant Branch (p-AGB) stars as the source of this line excitation, rather than extreme Blue Horizontal Branch stars. The emission-line ratios strongly exclude any contribution from recent star formation, but are fully consistent with recent population synthesis modelling of p-AGB emission by other authors, and favour excitation dominated by ambient gas of approximately solar abundance, rather than ejecta from the AGB stars themselves. The line equivalent widths are also larger than those observed in many fully passive (e.g. elliptical) galaxies, which may also be a consequence of a greater ambient gas density in the SFD regions.
description: 14 pages, 8 figures; published in MNRAS. Updated to match published version
Quasinormal modes of charged black holes in string theory
Creators: name: Shu, Fu-Wen
name: Shen, You-Gen
Publisher: name: arXiv
Year: 2004
Subjects: subject: General Relativity and Quantum Cosmology (gr-qc)
subject: FOS: Physical sciences

description: Both scalar and Dirac quasinormal modes in Garfinkle-Horowitz-Strominger black hole spacetime are studied by using the WKB approximation and the Pöschl-Teller approximation. For scalar field, we find that the QNMs with higher dilatons decay more rapidly than that with lower ones. However, this is not the case for mass $m$. Fields with higher mass will decay more slowly. The similar behaviors appear in the case of Dirac field. We also find that QNM frequencies evaluated by using WKB approximation and Pöschl-Teller approximation have a good agreement with each other when mode number $n$ is small.
description: 15pages, 9 figures. Accepted for publication in Phys.Rev.D
title: Infrared spectroscopy of volcanic gases at Masaya, Nicaragua
Creators: name: Horrocks, Lisa Anne
Publisher: name: The Open University
Year: 2001

description: Volcanic gases carry valuable information about processes occurring at active volcanoes, and so their accurate measurement and analysis are highly desirable. Masaya is a low-lying persistently active basaltic volcano, which is renowned for strong passive gas emission unaccompanied by lava extrusion, although it has also undergone plinian eruptions in the past. Its consistent behaviour sustains a reliable tropospheric plume, making it an ideal location at which to study volcanic degassing.

During February-March 1998 and March 1999, Masaya's gas plume composition was investigated using the new ground-based remote sensing technique of open-path Fourier transform infrared spectroscopy. This technique meets criteria for safe and accurate quantitative characterisation of volcanic gases and on a temporal resolution previously impracticable. Flexibility of operation is the chief merit of OP-FTIR, since a range of infrared sources are available (e.g. an active lamp, the sun or hot volcanic vents). Laboratory calibration experiments using primary gas standards confirmed that the instrument and subsequent spectral analysis provide highly accurate concentration measurements for volcanic species, with errors typically around 5 %.

Results showed that Masaya's plume composition was little changed between the field seasons. Average molar ratios for S02/HCl, HCl/HF, C02/S02 and H20/S02 were 1.6, 4.9, 2.2 and 72, respectively, in 1998, and 1.6, 5.1, 2.3 and 66 in 1999. These ratios, coupled with simultaneous COSPEC-derived SO2 data, indicated that emission rates, especially of HCl and HF, were high compared with other passively-degassing volcanoes. Measurements using the spectrometer with different infrared sources and at different locations downwind demonstrated that tropospheric scavenging processes had little discernible effect on plume composition.

In the light of these new OP-FTIR gas data, possible physical mechanisms for the degassing behaviour at Masaya Volcano have been discussed. In order to account for all the observations, an integrated model, in which gas emission rates are primarily controlled by degassing-driven convection in the conduit, is proposed.
title: STUDY OF MECHANICAL PROPERTIES OF COPPER SLAG REINFORCED PARTICULATE POLYMER COMPOSITE
Creators: name:  Arunprasath, K.
name: Amuthakkannan, P.
name: Manikandan, V.
name: Kavitha, S.
name: Radhkrishnan, B.
Publisher: name: Peter the Great St. Petersburg Polytechnic University
Year: 2021
Subjects: Copper slag
Polyester resin
Particulate composite
Mechanical properties
SEM morphology.

description: The era of composites now a day’s starts with different mixtures of various phases in different constituents the new idea with some concept development may arises the researchers to motivate in differential approaches and thoughts. From this, we have an idea to promote over some of the waste to enhance the strength of the particulate with effective mechanical properties. In this paper, the tensile, flexural, impact strength of copper (cu) slag powder in different weight percentages as 5wt. %, 10wt. %, 15wt. %, and 20wt. % were analyzed. The composites were fabricated with hand layup techniques. The mechanical properties of the composites were tested using universal testing machine and Izod impact tester. When increasing of particulate in the composites increasing of mechanical properties was observed from this research work. SEM analysis gives the information about the poor bonding, micropores, and lack of copper inclusion in the various weight percentage copper slag reinforced in the polyester composite.
Cambio climático a nivel de nicho y caña de azúcar. I Tamazula, Jalisco, México.
Creators: name: Lomelí-Sandova, Nora Araceli
name: Muñoz-Orozco, Abel
name: Zúniga-González, Carlos Alberto
name: Caballero-Hernandez4, Alvaro José
name: Vázquez-Montenegro, Ranses José
name: Lomelí-Sandova, Nora Araceli
name: Muñoz-Orozco, Abel
name: Zúniga-González, Carlos Alberto
name: Caballero-Hernandez4, Alvaro José
name: Vázquez-Montenegro, Ranses José
Publisher: name: Unknown
Year: 2015
Subjects: subject: Environmental Economics and Policy
subject: Productivity Analysis
subject: Resource /Energy Economics and Policy
subject: Cambio Climático
subject: Modelos simulación
subject: Nicho
subject: Meteorología

description: El presente trabajo tuvo como objetivo estudiar las variaciones relacionadas con la gran sequía invernal (GSI), la sequía intraestival (SI), la ocurrencia de heladas, golpes de calor y excesos de lluvia, aprovechando datos históricos disponibles de la localidad de Tamazula, Jalisco como un espacio dentro de un nicho; así mismo, comparar las variaciones antes y después de 1975, año tomado como referencia de la manifestación del último cambio climático según la Figura 2. Otro objetivo colateral fue vincular dicho desarrollo histórico con un experimento de variedades de caña realizado en 2011-2013 cerca de Tamazula, Jalisco.
Real space analysis of inherent structures
Creators: name: Bertin, Eric
Publisher: name: arXiv
Year: 2004
Subjects: subject: Disordered Systems and Neural Networks (cond-mat.dis-nn)
subject: Statistical Mechanics (cond-mat.stat-mech)
subject: FOS: Physical sciences

description: We study a generalization of the one-dimensional disordered Potts model, which exhibits glassy properties at low temperature. The real space properties of inherent structures visited dynamically are analyzed through a decomposition into domains over which the energy is minimized. The size of these domains is distributed exponentially, defining a characteristic length scale which grows in equilibrium when lowering temperature, as well as in the aging regime at a given temperature. In the low temperature limit, this length can be interpreted as the distance between `excited' domains within the inherent structures.
description: 7 pages, 8 figures, final version
Interhemispheric transport into the southern hemisphere polar stratosphere from the Asian monsoon region
Creators: name: Yan, Xiaolu
name: Konopka, Paul
name: Ploeger, Felix
name: Podglajen, Aurelien
Publisher: name: Forschungzentrum Jülich
Year: 2023

description: EGU General Asssembly 2023 Wien, Wien, Austria, 24 Apr 2023 - 28 Apr 2023
description: The Brewer-Dobson circulation is the wave driven meridional circulation of the stratosphere it plays an important role in determining the transport of trace gases and aerosols within the stratosphere, affecting the lifetimes of ozone depleting substances, and the global radiation budget. The overturning part of the circulation is usually split into a deep and a shallow branch. Here, we investigate the dynamical driving of these circulation branches, aiming for a dynamical separation of different circulation regimes.For that purpose, we use data from fifth generation atmospheric reanalysis ERA5 by the European Centre for Medium-range Weather Forecasts (ECMWF) and apply the Transformed Eulerian Mean approach to estimate the overturning mass flux and the related wave forcing in the stratosphere. We find that reducing the horizontal resolution of the data from 0.3 to 1 degree does not affect results significantly. However, reducing temporal resolution from 1 to 6 hours has a significant effect on the structure of daily mean upwelling, but this effect is much less pronounced for monthly means. Eliassen-Palm flux divergence is used as a diagnostic to estimate the wave propagation in the stratosphere. Using Fourier transformation for spectral decomposition we estimate the contribution from different waves to the driving of the deep and shallow branches. In particular, it is found that the deep branch has a strong seasonality with maximum in winter, while the shallow branch is less affected by the change of seasons. On the one hand, we find a strong correlation between variability in residual circulation velocity along the deep branch and large scale waves with wavenumber 3 or smaller. On the other hand, variability of medium and small scale waves with wavenumber 4 or greater correlates strongly with variability in the shallow branch circulation velocities. The change between these two dynamical regimes happens at a level close to 37 hPa. These results were further tested by applying a downward control calculation, showing that indeed the large-scale, planetary waves (wavenumber less than 4) account for the largest part of deep branch variability, while smaller waves (wavenumber larger than 3) account for the largest part of shallow branch variability. Based on these results, we propose a physical definition of the different Brewer-Dobson circulation branches, with the deep branch defined as driven by planetary waves (wave numbers 1-3) and located above 35 hPa, whereas the shallow branch being located below that level and driven by smaller-scale waves (wave numbers 4 and greater).
Optimal extraction of echelle spectra: getting the most from observations
Creators: name: Piskunov, Nikolai
name: Wehrhahn, Ansgar
name: Marquart, Thomas
Publisher: name: arXiv
Year: 2020
Subjects: subject: Instrumentation and Methods for Astrophysics (astro-ph.IM)
subject: FOS: Physical sciences

description: The price of instruments and observing time on modern telescopes is quickly increasing with the size of the primary mirror. Therefore, it is worth revisiting the data reduction algorithms to extract every bit of scientific information from observations. Echelle spectrographs are typical instruments in high-resolution spectroscopy, but attempts to improve the wavelength coverage and versatility of these instruments results in a complicated and variable footprint of the entrance slit projection onto the science detector. Traditional spectral extraction methods fail to perform a truly optimal extraction, when the slit image is not aligned with the detector columns but instead is tilted or even curved. We here present the mathematical algorithms and examples of their application to the optimal extraction and the following reduction steps for echelle spectrometers equipped with an entrance slit, that is imaged with various distortions, such as variable tilt and curvature. The new method minimizes the loss of spectral resolution, maximizes the signal-to-noise ratio, and efficiently identifies local outliers. In addition to the new optimal extraction we present order splicing and a more robust continuum normalization algorithms. We have developed and implemented new algorithms that create a continuum-normalized spectrum. In the process we account for the (variable) tilt/curvature of the slit image on the detector and achieve optimal extraction without prior assumptions about the slit illumination. Thus the new method can handle arbitrary image slicers, slit scanning, and other observational techniques aimed at increasing the throughput or dynamic range. We compare our methods with other techniques for different instruments to illustrate superior performance of the new algorithms compared to commonly used procedures.
description: 18 pages, 23 figures, PyReduce code available at https://github.com/AWehrhahn/PyReduce
GOMP: Grasp-Optimized Motion Planning for Bin Picking
Creators: name: Ichnowski, Jeffrey
name: Danielczuk, Michael
name: Xu, Jingyi
name: Satish, Vishal
name: Goldberg, Ken
Publisher: name: arXiv
Year: 2020
Subjects: subject: Robotics (cs.RO)
subject: FOS: Computer and information sciences

description: Rapid and reliable robot bin picking is a critical challenge in automating warehouses, often measured in picks-per-hour (PPH). We explore increasing PPH using faster motions based on optimizing over a set of candidate grasps. The source of this set of grasps is two-fold: (1) grasp-analysis tools such as Dex-Net generate multiple candidate grasps, and (2) each of these grasps has a degree of freedom about which a robot gripper can rotate. In this paper, we present Grasp-Optimized Motion Planning (GOMP), an algorithm that speeds up the execution of a bin-picking robot's operations by incorporating robot dynamics and a set of candidate grasps produced by a grasp planner into an optimizing motion planner. We compute motions by optimizing with sequential quadratic programming (SQP) and iteratively updating trust regions to account for the non-convex nature of the problem. In our formulation, we constrain the motion to remain within the mechanical limits of the robot while avoiding obstacles. We further convert the problem to a time-minimization by repeatedly shorting a time horizon of a trajectory until the SQP is infeasible. In experiments with a UR5, GOMP achieves a speedup of 9x over a baseline planner.
Aspectos a valorar dentro de la bioeconomía y su sendero de eco – intensificación para el buen desempeño de la actividad apícola ante la variabilidad de la Actividad Solar y Geomagnética y los cambios climáticos.
Creators: name: Sierra-Figueredo, Pablo
name: Pérez-Piñeiro, Adolfo M.
name: Durán-Zarabozo, Odil
name: Castellanos-Potenciano, Blanca
name: Zaldivar-Cruz, Juan Manuel
name: Sierra-Figueredo, Pablo
name: Pérez-Piñeiro, Adolfo M.
name: Durán-Zarabozo, Odil
name: Castellanos-Potenciano, Blanca
name: Zaldivar-Cruz, Juan Manuel
Publisher: name: Unknown
Year: 2015
Subjects: subject: Environmental Economics and Policy
subject: Resource /Energy Economics and Policy
subject: producción apícola
subject: actividad solar y geomagnética
subject: cambio climático.

description: La actividade productiva de las abejas (Apis mellifera) es susceptible de ser afectada por numerosos factores naturales, sobre todo los meteorológicos por razones de que su accionar está fuertemente vinculado al estado del tiempo, que impone límites para su labor. La presencia cada año de eventos meteorológicos severos es un factor también a tener en cuenta por su impacto directo en las plantas y en la propia población de abejas. Las plagas y epidemias que sufren las colonias de abejas de cierta forma modulan la producción, haciendo decaer severamente la misma ante la aparición de aquellas. A su vez se ha encontrado y mostrado en numerosos trabajos que el clima, el estado del tiempo y la aparición de plagas y epidemias, muestran una sensible dependencia con la Actividad Solar y geomagnética, provocando esto que el fenómeno sea mucho más complejo por lo multivariado. En el presente trabajo mostramos los resultados de un análisis de la variabilidad de la producción de miel de abejas en el territorio cubano durante 50 años y su posible asociación a largo plazo con la variabilidad de la actividad solar y geomagnética. Se analiza producción de miel, de cera, así como la productividad por colmena para todo el período. Se discuten los resultados y se plantean hipótesis sobre la relación encontrada, que permite establecer una asociación entre el comportamiento de los indicadores productivos y la actividad solar y geomagnética.
title: Laser cooling of rubidium atoms in a magneto-optical trap
Creators: name: Hopkins, Stephen Anthony
Publisher: name: The Open University
Year: 1996

description: This thesis describes theoretical and experimental work concerning radiation forces on atoms, with particular reference to rubidium atoms confined in a magneto-optical trap. After a short history of the field of laser cooling, a review of the semiclassical theory of mechanical interactions between two-level atoms and electromagnetic radiation is given. Different formulations of the semiclassical theory are discussed, including a new formulation in terms of momentum transfer amongst the plane wave modes of the electromagnetic field. Two important applications of light forces on atoms, namely 'optical molasses' and the 'magneto-optical trap', are then described with emphasis on experimental parameters. Three sub-Doppler cooling mechanisms, 'sisyphus cooling', 'motion-induced orientation cooling' and the 'magnetically-assisted sisyphus effect', are described and their role in optical molasses and the magneto-optical trap is discussed. A new study of the polarisation gradients which occur in 3-D monochromatic light fields is presented and quantifies their relative presence in different light field configurations. Polarisation gradient parameters are developed and shown to be directly related to the relativistic spin tensor of the light field. Implications of this polarisation gradient study for laser cooling work are discussed. The design, construction from scratch, operation and testing of a magneto-optical trap for rubidium are described, including novel designs for two vacuum cells. Preliminary experiments to characterise the trap are described and results are presented; they primarily concern the number and distribution of atoms in the trap. Finally. the theory of time domain spectroscopy is reviewed. The construction and testing of a pulsed dye laser for study of coherent transients in samples of laser-cooled atoms and a proposed experiment to measure the temperature of cold atoms using coherent transients are described. Factors expected to influence the shape of coherent transients in cold atoms are discussed.