cometadata/datacite-rtg-text-other-reclassification-records huggingface dataset:
Time-Resolved Fluorescence-Based Assay for the Determination of Alkaline Phosphatase Activity and Application to the Screening of Its Inhibitors
Creators: name: Schrenkhammer, Petra
name: Rosnizeck, Ina C.
name: Dürkop, Axel
name: Wolfbeis, Otto S.
Publisher: name: Universität Regensburg
Year: 2008
Subjects: subject: 540 Chemie

description: A single-step end point method is presented for determination of the activity of the enzyme alkaline phosphatase (ALP) using the effect of enhancement of fluorescence of the easily accessible europium(III)-tetracycline 3:1 complex (Eu3TC). Its luminescence, peaking at 616 nm if excited at 405 nm, is enhanced by a factor of 2.5 in the presence of phosphate. Phenyl phosphate was used as a substrate that is enzymatically hydrolyzed to form phenol and phosphate. The latter coordinates to Eu3TC and enhances its luminescence intensity as a result of the displacement of water from the inner coordination sphere of the central metal. The assay is performed in a time-resolved (gated) mode, which is shown to yield larger signal changes than steady-state measurement of fluorescence. The limit of detection for ALP is 4 µmol L—1. Based on this scheme, a model assay for theophylline as inhibitor for ALP was developed with a linear range from 14 to 68 µmol L— 1 of theophylline.
Twist decomposition of non-linear effects in Balitsky-Kovchegov evolution of proton structure functions
Creators: name: Motyka, Leszek
name: Sadzikowski, Mariusz
Publisher: name: arXiv
Year: 2023
Subjects: subject: High Energy Physics - Phenomenology (hep-ph)
subject: FOS: Physical sciences

description: Effects of non-linear small-x evolution of the gluon distribution given by the Balitsky-Kovchegov equation are analyzed within the collinear approximation framework. We perform a twist decomposition of the proton structure functions F2 and FL obtained from the Balitsky-Kovchegov equation using the Mellin representation of the scattering cross-sections at high energies. In both the structure functions we find strong corrections coming from the non-linear effects in the gluon evolution at twist 2, and strongly suppressed higher twist effects. This implies that unitarization effects of high energy scattering amplitudes are mostly the leading twist effect. Furthermore we consider the double logarithmic limit of the Balitsky--Kovchegov equation for the collinear gluon distribution, and compare the result to the Gribov-Levin-Ryskin equation. We find that these two equations differ by two powers of the hard scale logarithm for the large scales.
description: 21 pages, 3 figures, the final version published in European Physical Journal C
Fluorescent probes for microdetermination of inorganic phosphates and biophosphates
Creators: name: Spangler, Christian
name: Schäferling, Michael
name: Wolfbeis, Otto S.
Publisher: name: Universität Regensburg
Year: 2008
Subjects: subject: Phosphate probe; phosphate sensor; fluorescence; biophosphates
subject: 540 Chemie

description: This review covers the progress made in the development of fluorescent probes for inorganic and organic phosphates that are of significance in biosciences. Such probes need to work at physiological pH and at room temperature. The various modes of interactions between probe and phosphate species are discussed, not the least with the aim to assist in the design of more selective probes for which there is a substantial need.
Sustainability criterion implied externality pricing for resource extraction
Creators: name: Grainger, Daniel
Publisher: name: arXiv
Year: 2023
Subjects: subject: General Economics (econ.GN)
subject: FOS: Economics and business

description: A dynamic model is constructed that generalises the Hartwick and Van Long (2020) endogenous discounting setup by introducing externalities and asks what implications this has for optimal natural resource extraction with constant consumption. It is shown that a modified form of the Hotelling and Hartwick rule holds in which the externality component of price is a specific function of the instantaneous user costs and cross price elasticities. It is demonstrated that the externality adjusted marginal user cost of remaining natural reserves is equal to the marginal user cost of extracted resources invested in human-made reproducible capital. This lends itself to a discrete form with a readily intuitive economic interpretation that illuminates the stepwise impact of externality pricing on optimal extraction schedules.
description: 7 pages
No-arbitrage pricing under cross-ownership
Creators: name: Fischer, Tom
Publisher: name: arXiv
Year: 2010
Subjects: subject: Pricing of Securities (q-fin.PR)
subject: General Finance (q-fin.GN)
subject: FOS: Economics and business
subject: 91B24, 91B25, 91B52, 91G20, 91G40, 91G50

description: We generalize Merton's asset valuation approach to systems of multiple financial firms where cross-ownership of equities and liabilities is present. The liabilities, which may include debts and derivatives, can be of differing seniority. We derive equations for the prices of equities and recovery claims under no-arbitrage. An existence result and a uniqueness result are proven. Examples and an algorithm for the simultaneous calculation of all no-arbitrage prices are provided. A result on capital structure irrelevance for groups of firms regarding externally held claims is discussed, as well as financial leverage and systemic risk caused by cross-ownership.
description: Excerpts and ideas from this paper have been presented at the Scientific Conference of the German Association for Actuarial and Financial Mathematics (DGVFM), Bremen, April 30, 2010. Some methods and systems derived from this work have been subject to a provisional (successful) patent filing
George does not exist : strategic silencing and methodical colonialism
Creators: name: Beier, Deanne Nicole
Publisher: name: University of British Columbia
Year: 2017

description: In this thesis, I investigate the silenced histories of Indigenous peoples who have been written out of collective memory, official documents and, in some cases, their own family histories. I show how the actions of colonists can be explained through a colonial-Marxist lens of historical materialism and how this methodologically creates space for colonialism which, consequently, strategically silences and erases Indigenous lives. I focus my research on a family who has searched for answers for over sixty years, the Beier family, to aid them in the search for the life story of George Ralph McKenzie, an Indigenous man who served in the Canadian military and who was erased from his family’s history. I gathered data, including but not limited to, birth and death certificates, photographs and documents to compile a probable or possible record of McKenzie’s existence. I exhausted available archival, historical, religious, genealogical, public, private, professional and governmental databases and resources. Knowledge and interactions of Indigenous presences in areas coveted by European governments, during first-contact, provoked a need to design strategies to be used during interactions with Indigenous peoples. The Church has also been an integral part of many European governments and the alterations of interpretations and editing of religious texts have been used as a tool for maintaining public control for millenniums. Silencing Indigenous peoples through education was a deliberate and methodical form of colonization used to dominate Indigenous societies. During the wars in which Canada participated Indigenous peoples were, often, not accurately recorded. This is due to a systemic and structural type of diversion and Indigenous peoples were still considered to be dispensable at the time. Erasure cultivates within families, due to systemic and systematic racism and oppression of cultures and heritages. In 2017, Canada is oppressing and silencing Indigenous voices. Canada is using terms such as multiculturalism and diversity to boast about its acceptance and compassion for others while ignoring the needs of Indigenous peoples. Reconciliation will involve the decolonization or dismantling of an entire system of colonialism that is entrenched in the relationships, personal lives, politics, laws, and governments in Canada.
Network slicing for vehicular communications: a multi-agent deep reinforcement learning approach
Creators: name: Mlika, Zoubeir
name: Cherkaoui, Soumaya
Publisher: name: arXiv
Year: 2022
Subjects: subject: Networking and Internet Architecture (cs.NI)
subject: FOS: Computer and information sciences

description: This paper studies the multi-agent resource allocation problem in vehicular networks using non-orthogonal multiple access (NOMA) and network slicing. To ensure heterogeneous service requirements for different vehicles, we propose a network slicing architecture. We focus on a non-cellular network scenario where vehicles communicate by the broadcast approach via the direct device-to-device interface. In such a vehicular network, resource allocation among vehicles is very difficult, mainly due to (i) the rapid variation of wireless channels among highly mobile vehicles and (ii) the lack of a central coordination point. Thus, the possibility of acquiring instantaneous channel state information to perform centralized resource allocation is precluded. The resource allocation problem considered is therefore very complex. It includes not only the usual spectrum and power allocation, but also coverage selection (which target vehicles to broadcast to) and packet selection (which network slice to use). This problem must be solved jointly since selected packets can be overlaid using NOMA and therefore spectrum and power must be carefully allocated for better vehicle coverage. To do so, we provide a optimization approach and study the NP-hardness of the problem. Then, we model the problem using multi-agent Markov decision process. Finally, we use a deep reinforcement learning (DRL) approach to solve the problem. The proposed DRL algorithm is practical because it can be implemented in an online and distributed manner. We show that our approach is robust and efficient when faced with different variations of the network parameters and compared to centralized benchmarks.
On the effects of rotation on acoustic stellar pulsations: validity domains of perturbative methods and close frequency pairs
Creators: name: Burke, K. D.
name: Reese, D. R.
name: Thompson, M. J.
Publisher: name: arXiv
Year: 2011
Subjects: subject: Solar and Stellar Astrophysics (astro-ph.SR)
subject: FOS: Physical sciences

description: Pulsation frequencies of acoustic modes are calculated for realistic rotating stellar models using both a perturbative and a two-dimensional approach. A comparison between the two yields validity domains which are similar to those previously obtained in Reese, Lignieres and Rieutord (2006) for polytropic models. One can also construct validity domains based on polynomial fits to the frequencies from the two-dimensional approach, and these also turn out to be similar, thus further confirming the agreement between the perturbative and two-dimensional approach at low rotation rates. Furthermore, as was previously shown in Espinosa, Perez Hernandez and Roca Cortes (2004), adjacent frequencies in multiplets come close together, thus forming pairs. This phenomena, exclusive to two-dimensional calculations, is shown to be an unlikely explanation of the close frequency pairs observed in delta Scuti stars. A systematic search for all close frequency pairs in the calculated spectrum is also carried out. The number of close frequency pairs is shown to agree with what is expected based on a Poisson distribution, but does not match the number or distribution of close pairs in stars like FG Vir. Furthermore, a lack of close frequency pairs appears at low rotation rates, where frequency multiplets do not overlap. Delta Scuti stars currently reported as having close frequency pairs do not fall in this interval.
description: 9 pages, 7 figures, 2 tables, accepted for publication in MNRAS
Dual Fluorescence Sensor for Trace Oxygen and Temperature with Unmatched Range and Sensitivity
Creators: name: Baleizo, Carlos
name: Nagl, Stefan
name: Schäferling, Michael
name: Berberan-Santos, Mario S.
name: Wolfbeis, Otto S.
Publisher: name: Universität Regensburg
Year: 2008
Subjects: subject: 540 Chemie

description: An optical dual sensor for oxygen and temperature is presented that is highly oxygen sensitive and covers a broad temperature range. Dual sensing is based on luminescence lifetime measurements. The novel sensor contains two luminescent compounds incorporated into polymer films. The temperature-sensitive dye (ruthenium tris-1,10-phenanthroline) has a highly temperature-dependent luminescence and is incorporated in poly(acrylonitrile) to avoid cross-sensitivity to oxygen. Fullerene C70 was used as the oxygen-sensitive probe owing to its strong thermally activated delayed fluorescence at elevated temperatures that is extremely oxygen sensitive. The cross-sensitivity of C70 to temperature is accounted for by means of the temperature sensor. C70 is incorporated into a highly oxygen-permeable polymer, either ethyl cellulose or organosilica. The two luminescent probes have different emission spectra and decay times, and their emissions can be discriminated using both parameters. Spatially resolved sensing is achieved by means of fluorescence lifetime imaging. The response times of the sensor to oxygen are short. The dual sensor exhibits a temperature operation range between at least 0 and 120 °C, and detection limits for oxygen in the ppbv range, operating for oxygen concentrations up to at least 50 ppmv. These ranges outperform all dual oxygen and temperature sensors reported so far. The dual sensor presented in this study is especially appropriate for measurements under extreme conditions such as high temperatures and ultralow oxygen levels. This dual sensor is a key step forward in a number of scientifically or commercially important applications including food packaging, for monitoring of hyperthermophilic microorganisms, in space technology, and safety and security applications in terms of detection of oxygen leaks.
Broadband surface-emitting THz laser frequency combs with inverse-designed integrated reflectors
Creators: name: Senica, Urban
name: Gloor, Sebastian
name: Micheletti, Paolo
name: Stark, David
name: Beck, Mattias
name: Faist, Jérôme
name: Scalari, Giacomo
Publisher: name: arXiv
Year: 2023
Subjects: subject: Optics (physics.optics)
subject: FOS: Physical sciences

description: THz quantum cascade lasers (QCLs) based on double metal waveguides feature broadband and high-temperature devices for use in spectroscopy and sensing. However, their extreme field confinement produces poor output coupling efficiencies and divergent far-fields. Here, we present a planarized THz QCL with an inverse-designed end facet reflector coupled to a surface-emitting patch array antenna. All the components have been optimized for octave-spanning spectral bandwidths between 2-4 THz and monolithically integrated on the same photonic chip. We demonstrate this experimentally on broadband THz QCL frequency combs, with measured devices showing a seven-fold improvement in slope efficiency compared to devices with a cleaved facet. They feature peak powers of up to 13.5 mW with surface emission into a narrow beam with a divergence of (17.0°x 18.5°), while broadband fundamental and harmonic comb states spanning up to 800 GHz are observed.
description: 6 pages, 5 figures
Dark Stars and Boosted Dark Matter Annihilation Rates
Creators: name: Ilie, Cosmin
name: Freese, Katherine
name: Spolyar, Douglas
Publisher: name: arXiv
Year: 2010
Subjects: subject: Cosmology and Nongalactic Astrophysics (astro-ph.CO)
subject: FOS: Physical sciences

description: Dark Stars (DS) may constitute the first phase of stellar evolution, powered by dark matter (DM) annihilation. We will investigate here the properties of DS assuming the DM particle has the required properties to explain the excess positron and elec- tron signals in the cosmic rays detected by the PAMELA and FERMI satellites. Any possible DM interpretation of these signals requires exotic DM candidates, with an- nihilation cross sections a few orders of magnitude higher than the canonical value required for correct thermal relic abundance for Weakly Interacting Dark Matter can- didates; additionally in most models the annihilation must be preferentially to lep- tons. Secondly, we study the dependence of DS properties on the concentration pa- rameter of the initial DM density profile of the halos where the first stars are formed. We restrict our study to the DM in the star due to simple (vs. extended) adiabatic contraction and minimal (vs. extended) capture; this simple study is sufficient to illustrate dependence on the cross section and concentration parameter. Our basic results are that the final stellar properties, once the star enters the main sequence, are always roughly the same, regardless of the value of boosted annihilation or concentration parameter in the range between c=2 and c=5: stellar mass ~ 1000M\odot, luminosity ~ 10^7 L\odot, lifetime ~ 10^6 yrs (for the minimal DM models considered here; additional DM would lead to more massive dark stars). However, the lifetime, final mass, and final luminosity of the DS show some dependence on boost factor and concentration parameter as discussed in the paper.
description: 37 pages, 11 figures
More than Open Data mandates: a staged model for achieving Open Access to scientific data
Creators: name: Lipton, Vera
Publisher: name: Australian Catholic University
Year: 2018

description: Public science is critical to the economy and to society. However, much of the beneficial impact of scientific research only occurs when scientific knowledge is disseminated broadly and is used by others. This thesis examines the emerging policy, law, and practice of facilitating open access to scientific research data. One particular focus is to examine the open data policies recently introduced by research funders and publishers, and the potential in these for driving the practice of open scientific data into the future. This thesis identifies five major stumbling blocks to sustainable open scientific data. Firstly, the prevailing ‘mindset’ that facilitating open access to data is analogous to facilitating open access to publications and, therefore, research data can easily be shared, with research funders and librarians effectively leading the process. Secondly, the unclear meaning of the term ‘data’, which causes confusion among stakeholders. Thirdly, ‘misunderstood incentives’ for data sharing and the additional inputs required from researchers. Fourthly, ‘data privacy’—an issue that only applies to selected research datasets, and yet appears to dominate the discussion about open research data. Finally, there is ‘copyright law’, which poses challenges at different stages of data release and reuse. In this thesis, I argue that the above problems can be addressed using a staged model for open scientific data. I draw specifically on the practice with open scientific data at CERN (the European Organization for Nuclear Research) and the practice of sharing clinical trial data to argue that open data can be shared at various stages of processing and diversification. This model is supplemented by recommendations proposing changes to existing open data mandates and the introduction of a text and data mining exemption into Australian copyright law.
An Optical Thermometer Based on the Delayed Fluorescence of C70
Creators: name: Baleizão, Carlos
name: Nagl, Stefan
name: Borisov, Sergey M.
name: Schäferling, Michael
name: Wolfbeis, Otto S.
name: Berberan-Santos, Mário N.
Publisher: name: Universität Regensburg
Year: 2007
Subjects: subject: C70; fluorescence; fullerenes; imaging; sensors; temperature sensing
subject: 540 Chemie

description: A sensitive and broad-ranged optical thermometer, based on the thermally activated delayed fluorescence of fullerene C70, is presented. It consists of C70 molecularly dispersed in a polymer film. Several polymer matrices were investigated. In the absence of oxygen the fluorescence intensity increases markedly with temperature. At 25 °C the fluorescence intensity of C70 increases maximally by a factor of between 17 and 22, depending on the polymer, whereas at 100 °C the fluorescence intensity can be 79 times higher. In the absence of oxygen and for temperatures above 20 °C, the red fluorescence of C70 in the films is so intense that it is easily perceived by the naked eye. For the systems studied, the fluorescence intensity is very sensitive to temperature. This results in a working range from −80 to at least 140 °C in the case of C70 in poly(tert-butyl methacrylate) (PtBMA). Perylene was incorporated into the film as an internal reference in order to enable ratiometric measurements. The sensitivity of the lifetime of the delayed fluorescence to temperature is also high and results in an even wider working range. The performance of the C70/PtBMA film was measured against a well-known optical temperature probe, [Ru(phen)3] (phen=phenanthroline). The results show that the C70/PtBMA film is a very good system for optical temperature-sensing over a wide range of temperatures, outperforming known standards.
Capacitive Detection in Ultrathin Chemosensors Prepared by Molecularly Imprinted Grafting Photopolymerization
Creators: name: Delaney, Tetyana L.
name: Zimin, Denys
name: Rahm, Michael
name: Weiss, Dieter
name: Wolfbeis, Otto S.
name: Mirsky, Vladimir M.
Publisher: name: Universität Regensburg
Year: 2007
Subjects: subject: 540 Chemie

description: The usual applications of capacitive detection in chemo- and biosensors are based on changes in effective thickness of insulating layers due to adsorption of analyte onto receptors. Ultrathin chemosensors based on molecularly imprinted polymerization enable a realization of another capacitive approach that exploits changes in electrical capacitance due to modification of the dielectric constant of the polymer. Such chemosensors were prepared by photografted molecularly imprinted polymerization on the surface of gold electrodes. An adsorbed layer of hydrophobic photoinitiator (benzophenone) provided grafted polymerization on the surface of the alkanethiol-modified gold electrode. The chemosensors were characterized by cyclic voltammetry, impedance spectroscopy, and scanning electron and atomic force microscopy. Binding of analyte was detected by measurements of electrical capacitance. The results indicate a decrease of the dielectric constant of the polymer layer due to analyte binding up to 20%.
Triplet superconductivity and spin density wave in biased AB bilayer graphene
Creators: name: Sboychakov, A. O.
name: Rozhkov, A. V.
name: Rakhmanov, A. L.
Publisher: name: arXiv
Year: 2023
Subjects: subject: Superconductivity (cond-mat.supr-con)
subject: FOS: Physical sciences

description: We examine spin density wave and triplet superconductivity as possible ground states of the Bernal bilayer graphene. The spin density wave is stable for the unbiased and undoped bilayer. Both the doping and the applied bias voltage destroy this phase. We show that, when biased and slightly doped, bilayer can host a triplet superconducting phase. The mechanisms for both ordered phases rely on the renormalized Coulomb interaction. Consistency of our theoretical conclusions with recent experimental results are discussed.
description: 14 pages, 8 figures, several misprints were corrected, Appendix A was re-written to correct several mistakes (conclusions remain the same), new discussion topics were added; this version is an accurate copy of the published paper
Dynamical neutrino masses in the generalized Chaplygin gas scenario with mass varying CDM
Creators: name: Bernardini, Alex E.
Publisher: name: arXiv
Year: 2010
Subjects: subject: Cosmology and Nongalactic Astrophysics (astro-ph.CO)
subject: FOS: Physical sciences

description: Neutrinos coupled to an underlying scalar field in the scenario for unification of mass varying dark matter and cosmon-{\em like} dark energy is examined. In the presence of a tiny component of mass varying neutrinos, the conditions for the present cosmic acceleration and for the stability issue are reproduced. It is assumed that {\em sterile} neutrinos behave like mass varying dark matter coupled to mass varying {\em active} neutrinos through the {\em seesaw} mechanism, in a kind of {\em mixed} dark matter sector. The crucial point is that the dark matter mass may also exhibit a dynamical behavior driven by the scalar field. The scalar field mediates the nontrivial coupling between the mixed dark matter and the dark energy responsible for the accelerated expansion of the universe. The equation of state of perturbations reproduce the generalized Chaplygin gas (GCG) cosmology so that all the effective results from the GCG paradigm are maintained, being perturbatively modified by neutrinos.
description: 19 pages, 5 figures
Network Slicing with MEC and Deep Reinforcement Learning for the Internet of Vehicles
Creators: name: Mlika, Zoubeir
name: Cherkaoui, Soumaya
Publisher: name: arXiv
Year: 2022
Subjects: subject: Networking and Internet Architecture (cs.NI)
subject: Signal Processing (eess.SP)
subject: FOS: Computer and information sciences
subject: FOS: Electrical engineering, electronic engineering, information engineering

description: The interconnection of vehicles in the future fifth generation (5G) wireless ecosystem forms the so-called Internet of vehicles (IoV). IoV offers new kinds of applications requiring delay-sensitive, compute-intensive and bandwidth-hungry services. Mobile edge computing (MEC) and network slicing (NS) are two of the key enabler technologies in 5G networks that can be used to optimize the allocation of the network resources and guarantee the diverse requirements of IoV applications. As traditional model-based optimization techniques generally end up with NP-hard and strongly non-convex and non-linear mathematical programming formulations, in this paper, we introduce a model-free approach based on deep reinforcement learning (DRL) to solve the resource allocation problem in MEC-enabled IoV network based on network slicing. Furthermore, the solution uses non-orthogonal multiple access (NOMA) to enable a better exploitation of the scarce channel resources. The considered problem addresses jointly the channel and power allocation, the slice selection and the vehicles selection (vehicles grouping). We model the problem as a single-agent Markov decision process. Then, we solve it using DRL using the well-known DQL algorithm. We show that our approach is robust and effective under different network conditions compared to benchmark solutions.
Quarkonia and Heavy-Quark Relaxation Times in the Quark-Gluon Plasma
Creators: name: Riek, F.
name: Rapp, R.
Publisher: name: arXiv
Year: 2010
Subjects: subject: High Energy Physics - Phenomenology (hep-ph)
subject: FOS: Physical sciences

description: A thermodynamic T-matrix approach for elastic 2-body interactions is employed to calculate spectral functions of open and hidden heavy-quark systems in the Quark-Gluon Plasma. This enables the evaluation of quarkonium bound-state properties and heavy-quark diffusion on a common basis and thus to obtain mutual constraints. The two-body interaction kernel is approximated within a potential picture for spacelike momentum transfers. An effective field-theoretical model combining color-Coulomb and confining terms is implemented with relativistic corrections and for different color channels. Four pertinent model parameters, characterizing the coupling strengths and screening, are adjusted to reproduce the color-average heavy-quark free energy as computed in thermal lattice QCD. The approach is tested against vacuum spectroscopy in the open (D, B) and hidden (Psi and Upsilon) flavor sectors, as well as in the high-energy limit of elastic perturbative QCD scattering. Theoretical uncertainties in the static reduction scheme of the 4-dimensional Bethe-Salpeter equation are elucidated. The quarkonium spectral functions are used to calculate Euclidean correlators which are discussed in light of lattice QCD results, while heavy-quark relaxation rates and diffusion coefficients are extracted utilizing a Fokker-Planck equation.
description: 33 pages, 28 figures
The Scholarly Communication of the Future: From Book Information to Problem Solving
Creators: name: Ball, Rafael
Publisher: name: Universität Regensburg
Year: 2011
Subjects: subject: Digital era , Digital scientific information , Electronic information environment , Electronic information , e-sciences , Scholarly communication future , Scholarly communication history , Science communication , Scientific platforms
subject: 020 Bibliotheks- und Informationswissenschaft

description: As long as scientists discuss scientific problems and communicate with each other, scholarly communication is an essential part of scientific activities. In the very ancient time the scholarly communication was only an oral tradition, a face to face communication. Later on, the written form of communication has taken place. Since the invention of movable printing types by Gutenberg the scholarly communication was preferable in written and printed form. Since 15 years the revolution has taken place with the digital information, which is now available for scholarly communication. There was a paradigm shift from the printed and oral tradition to a new digital electronic science communication. In the future the traditional printed book information for scientific communication will be replaced by problem solving portals with all electronic and digital tools.
CKU 18: Šarrumbani-Šu-Sîn (3.1.15)
Creators: name: Attinger, Pascal
Publisher: name: Zenodo
Year: 2019
Subjects: Sumerian
Ur
Translation
Traduction

description: Traduction Correspondence of the Kings of Ur 18: Šarrumbani-Šu-Sîn (3.1.15) Pascal Attinger, 2012, actualisé en 2019
Measuring helium abundance difference in giants of NGC 2808
Creators: name: Pasquini, L.
name: Mauas, P.
name: Kaufl, H. U.
name: Cacciari, C.
Publisher: name: arXiv
Year: 2011
Subjects: subject: Solar and Stellar Astrophysics (astro-ph.SR)
subject: FOS: Physical sciences

description: Multiple populations have been detected in several globular clusters (GC) that do not display a spread in metallicity. Unusual features of their CMD can be interpreted in terms of differences in the Helium content of the stars belonging to the sub-populations. Differences in He abundance have never been directly observed. We attempt to measure these differences in two giant stars of NGC 2808 with very similar parameters but different Na and O abundances, hence that presumably belong to different sub-populations, by directly comparing their He I 10830 Å lines. The He 10830 Å line forms in the upper chromosphere. Our detailed models derive the chromospheric structure using the Ca II and H$α$, and simulate the corresponding He I 10830 line profiles. We show that, at a given value of He abundance, the He I 10830 equivalent width cannot significantly change without a corresponding much larger change in the Ca II lines. We have used the VLT-CRIRES to obtain high-resolution spectra in the 10830 Å region, and the VLT-UVES to obtain spectra of the Ca II and H$α$ lines of our target stars. The two target stars have very similar Ca II and H$α$ lines, but different appearances in the He region. One line, blueshifted by 17 km s$^{-1}$ with respect to the He 10830 rest wavelength, is detected in the spectrum of the Na-rich star, whereas the Na-poor star spectrum is consistent with a non-detection. The difference in the spectra is consistent and most closely explained by an He abundance difference between the two stars of $ΔY \ge$ 0.17.We provide direct evidence of a significant He line strength difference in giant stars of NGC 2808 belonging to different sub-populations, which had been previously detected by other photometric and spectroscopic means.
description: Accepted for publication in A&A
Feasibility study of tall concrete-timber hybrid system
Creators: name: Kaushik, Kuldeep
Publisher: name: University of British Columbia
Year: 2017

description: Although wood is widely used as a construction material, it is mostly limited to low and mid-rise residential construction, partially due to fire code restrictions. This limitation can be overcome by considering hybrid systems which combine wood with non-combustible materials. This research presents an innovative wood-concrete hybrid system, suitable for tall buildings, where a concrete frame with slabs at every third story provides fire separation as well as stiffness and strength to resist gravity and lateral loads. The intermediate stories including their floors are constructed using light-frame wood modules. This approach reduces the environmental footprint of the building, reduces the building weight and therefore the seismic demand on connections and foundation, and speeds up the construction process. For a novel system, numerical modeling is crucial to predicting its structural response to static and dynamic loading. This thesis studies the structural feasibility of the system by developing finite element models and assessing the structural behavior at the component and system levels when subjected to earthquake and wind loads. Nonlinear analyses are performed considering material and geometric nonlinearity using multiple ground motions to estimate the structure’s inter-story drift and base shear. The results demonstrate the feasibility of the proposed wood-concrete hybrid system for tall buildings in high seismic zones.
Boronic acid based probes for microdetermination of saccharides and glycosylated biomolecules
Creators: name: Mader, Heike Sabine
name: Wolfbeis, Otto S.
Publisher: name: Universität Regensburg
Year: 2008
Subjects: subject: Fluorescent probes; boronic acid probes; saccharide, glycoproteins
subject: 540 Chemie

description: This review covers the progress made in the development of fluorescent probes for saccharides and glycosylated biomolecules. Such probes are supposed to work at physiological pH and at room temperature, and preferably have fast responses. The modes of interactions between probe and saccharides are discussed, not the least with the aim to assist in the design of more selective probes for which there is a substantial need
Controlling the path of discretized light in waveguide lattices
Creators: name: Longhi, Stefano
Publisher: name: arXiv
Year: 2011
Subjects: subject: Optics (physics.optics)
subject: FOS: Physical sciences

description: A general method for flexible control of the path of discretized light beams in homogeneous waveguide lattices, based on longitudinal modulation of the coupling constant, is theoretically proposed. As compared to beam steering and refraction achievable in graded-index waveguide arrays, the proposed approach enables to synthesize rather arbitrary target paths.
Sensitive luminescent determination of DNA using the terbium(III)–difloxacin complex
Creators: name: Yegorova, Alla V.
name: Scripinets, Yulia V.
name: Dürkop, Axel
name: Karasyov, Alexander A.
name: Antonovich, Valery P.
name: Wolfbeis, Otto S.
Publisher: name: Universität Regensburg
Year: 2007
Subjects: subject: UV–vis spectrometry; Luminescence; Terbium; Quinolones; Difloxacin; DNA
subject: 540 Chemie

description: The interaction of the terbium–difloxacin complex (Tb–DFX) with DNA has been examined by using UV–vis absorption and luminescence spectroscopy. The Tb–DFX complex shows an up to 85-fold enhancement of luminescence intensity upon titration with DNA. The long decay times allow additional detection schemes like time-resolved measurements in microplate readers to enhance sensitivity by off-gating short-lived background luminescence. Optimal conditions are found at equimolar concentrations of Tb3+ and DFX (0.1 or 1 μM) at pH 7.4. Under these conditions, the luminescence intensity is linearly dependent on the concentration of ds-DNAs and ss-DNA between 1–1500 ng mL−1 and 4.5–270 ng mL−1, respectively. The detection limit is 0.5 ng mL−1 for ds-DNAs and 2 ng mL−1 for ss-DNA. The mechanism for the luminescence enhancement was also studied.
Detectability of Exoplanets in the Beta Pic Moving Group with the Gemini Planet Imager
Creators: name: Kataria, Tiffany
name: Simon, Michal
Publisher: name: arXiv
Year: 2010
Subjects: subject: Solar and Stellar Astrophysics (astro-ph.SR)
subject: FOS: Physical sciences

description: We model the detectability of exoplanets around stars in the Beta Pic Moving Group (BPMG) using the Gemini Planet Imager (GPI), a coronagraphic instrument designed to detect companions by imaging. Members of the BPMG are considered promising targets for exoplanet searches because of their youth (~12 MY) and proximity (median distance ~35 pc). We wrote a modeling procedure to generate hypothetical companions of given mass, age, eccentricity, and semi-major axis, and place them around BPMG members that fall within the V-band range of the GPI. We count as possible detections companions lying within the GPI's field of view and H-band fluxes that have a host-companion flux ratio placing them within its sensitivity. The fraction of companions that could be detected depends on their brightness at 12 Myr, and hence formation mechanism, and on their distribution of semi-major axes. We used brightness models for formation by disk instability and core-accretion. We considered the two extreme cases of the semi-major axis distribution - the log-normal distribution of the nearby F and G type stars and a power-law distribution indicated by the exoplanets detected by the radial velocity technique. We find that the GPI could detect exoplanets of all the F and G spectral type stars in the BPMG sample with a probability that depends on the brightness model and semi-major axis distribution. At spectral type K to M1, exoplanet detectability depends on brightness and hence distance of the host star. GPI will be able to detect the companions of M stars later than M1 only if they are closer than 10 pc. Of the four A stars in BPMG sample, only one has V-band brightness in the range of GPI; the others are too bright.
description: Accepted for publication in the Astronomical Journal
Inclusive probability to record an electron in elastic electromagnetic scattering by a spin one-half hadron wave packet
Creators: name: Kazinski, P. O.
name: Rubtsova, D. I.
name: Sokolov, A. A.
Publisher: name: arXiv
Year: 2023
Subjects: subject: High Energy Physics - Phenomenology (hep-ph)
subject: FOS: Physical sciences

description: The inclusive probability to record an electron in elastic electromagnetic scattering of an electron by a spin one-half hadron is obtained, the initial quantum states of the electron and the hadron being described by the density matrices of a general form. Contrary to the Rosenbluth formula for the differential cross-section for this process, the first nontrivial contribution to the inclusive probability turns out to be of order $α$ and not $α^2$. This contribution describes the interference between the trivial contribution to the $S$-matrix and the leading contribution to its connected part. The explicit expression for this interference terms is derived. For example, for Gaussian wave packets the interference contribution to the inclusive probability is of relative order $2\times 10^{-2}$ in comparison with the contribution of the free passed particle for the nonrelativistic proton and the $10$ MeV electron with the normal deviation of momenta in the electron and hadron wave packets of order $10$ keV. It is shown that the same interference term arises when the electron is scattered by the classical electromagnetic field produced by the hadron electromagnetic current averaged with respect to the free evolving density matrix of the hadron, even in the case of a single hadron. The interference term describes coherent scattering of the electron by the hadron wave packet and is immune to the quantum recoil experienced by a hadron due to scattering. The effective electron mass operator is found on the mass-shell.
description: 18 pp., 3 figs, App. B added
Re-capturing cosmic information
Creators: name: Seo, Hee-Jong
name: Sato, Masanori
name: Dodelson, Scott
name: Jain, Bhuvnesh
name: Takada, Masahiro
Publisher: name: arXiv
Year: 2010
Subjects: subject: Cosmology and Nongalactic Astrophysics (astro-ph.CO)
subject: FOS: Physical sciences

description: Gravitational lensing of distant galaxies can be exploited to infer the convergence field as a function of angular position on the sky. The statistics of this field, much like that of the cosmic microwave background (CMB), can be studied to extract information about fundamental parameters in cosmology, most notably the dark energy in the Universe. Unlike the CMB, the distribution of matter in the Universe which determines the convergence field is highly non-Gaussian, reflecting the nonlinear processes which accompanied structure formation. Much of the cosmic information contained in the initial field is therefore unavailable to the standard power spectrum measurements. Here we propose a method for re-capturing cosmic information by using the power spectrum of a simple function of the observed (nonlinear) convergence field. We adapt the approach of Neyrinck et al. (2009) to lensing by using a modified logarithmic transform of the convergence field. The Fourier transform of the log-transformed field has modes that are nearly uncorrelated, which allows for additional cosmological information to be extracted from small-scale modes.
description: 10 pages, 4 figures
Deep-learning assisted reduced order model for high-dimensional flow prediction from sparse data
Creators: name: Wu, Jiaxin
name: Xiao, Dunhui
name: Luo, Min
Publisher: name: arXiv
Year: 2023
Subjects: subject: Fluid Dynamics (physics.flu-dyn)
subject: FOS: Physical sciences

description: The reconstruction and prediction of full-state flows from sparse data are of great scientific and engineering significance yet remain challenging, especially in applications where data are sparse and/or subjected to noise. To this end, this study proposes a deep-learning assisted non-intrusive reduced order model (named DCDMD) for high-dimensional flow prediction from sparse data. Based on the compressed sensing (CS)-Dynamic Mode Decomposition (DMD), the DCDMD model is distinguished by two novelties. Firstly, a sparse matrix is defined to overcome the strict random distribution condition of sensor locations in CS, thus allowing flexible sensor deployments and requiring very few sensors. Secondly, a deep-learning-based proxy is invoked to acquire coherent flow modes from the sparse data of high-dimensional flows, thereby addressing the issue of defining sparsity and the stringent incoherence condition in the conventional CSDMD. The two advantageous features, combined with the fact that the model retains flow physics in the online stage, lead to significant enhancements in accuracy and efficiency, as well as superior insensitivity to data noises (i.e., robustness), in both reconstruction and prediction of full-state flows. These are demonstrated by three benchmark examples, i.e., cylinder wake, weekly-mean sea surface temperature and isotropic turbulence in a periodic square area.
description: 36 Pages, 23 Figures, 5 Tables
Fiber-Optic Microsensors for Simultaneous Sensing of Oxygen and pH, and of Oxygen and Temperature
Creators: name: Kocincová, Anna S.
name: Borisov, Sergey M.
name: Krause, Christian
name: Wolfbeis, Otto S.
Publisher: name: Universität Regensburg
Year: 2007
Subjects: subject: 540 Chemie

description: Fiber-optic microsensors with a tip diameter of 140 μm have been developed that enable simultaneous measurement of dissolved oxygen (DO) and pH, and of DO and temperature (T), respectively. The tip of the optical fiber was covered with sensor compositions based on luminescent microbeads that respond to the respective parameters by a change in the decay time, intensity of their luminescence, or both. The use of microbeads enables the ratio of the signals to be easily varied, reduces the risk of fluorescence energy transfer between indicator dyes, and reduces the adverse effect of singlet oxygen that is produced in the oxygen-sensitive beads. The sensor chemistry for DO/pH was modified
The Click Reaction in the Luminescent Probing of Metal Ions, and Its Implications on Biolabeling Techniques
Creators: name: Wolfbeis, Otto S.
Publisher: name: Universität Regensburg
Year: 2007
Subjects: subject: analytical methods; cell assays; click chemistry; copper; fluorescent probes
subject: 540 Chemie

description: Copper concentrations at a click: The copper(I)-catalyzed Huisgen cycloaddition (the “click reaction”) enables micromolar concentrations of physiologically active Cu+ ions to be sensed through photonic energy transfer (ET, see scheme), and offers great potential in terms of labeling methods.
Un emblema en el siglo XXI mexicano
Creators: name: Pérez Caballero, Jesús
Publisher: name: El Mañana de Nuevo Laredo
Year: 2023
Subjects: México
emblema
Andrés Alciato
Bernardino Daza Pinciano
El Mañana de Nuevo Laredo
prensa de México
ensayo
jamsa
mano pantea
Dextera Dei
mano de Fátima
La Mano con Ojos
delincuencia organizada
propaganda
violencia
emblemática
símbolo
alegoría
Diego de Saavedra Fajardo
Empresas políticas
prudencia

description: El nombre de un grupo criminal mexicano sugiere un ensayo donde se repasan emblemas y símbolos de una «mano con ojo».
description: Columna «Desde la frontera», publicada en El Mañana de Nuevo Laredo, p. 4 (local).
Progress towards fabrication of Th:229-doped high energy band-gap crystals for use as a solid-state optical frequency reference
Creators: name: Rellergert, Wade G.
name: Sullivan, Scott T.
name: DeMille, D.
name: Greco, R. R.
name: Hehlen, M. P.
name: Jackson, R. A.
name: Torgerson, J. R.
name: Hudson, Eric R.
Publisher: name: arXiv
Year: 2010
Subjects: subject: Atomic Physics (physics.atom-ph)
subject: FOS: Physical sciences

description: We have recently described a novel method for the construction of a solid-state optical frequency reference based on doping $^{229}$Th into high energy band-gap crystals. Since nuclear transitions are far less sensitive to environmental conditions than atomic transitions, we have argued that the $^{229}$Th optical nuclear transition may be driven inside a host crystal resulting in an optical frequency reference with a short-term stability of $3\times10^{-17}
description: Eurodim Conference Proceedings
Sensor Paints
Creators: name: Wolfbeis, Otto S.
Publisher: name: Universität Regensburg
Year: 2008
Subjects: subject: biosensors; dyes; fluorescence; polymers; sensors; stimuli-responsive materials
subject: 540 Chemie

description: Fluorescence microscopy is widely used for chemical imaging of intrinsically fluorescent chemical species, such as chlorophylls, or nonfluorescent species (e.g., DNA) that have been labeled appropriately or to which a relevant molecular probe has been added. However, there are numerous analytes that neither have an intrinsic luminescence nor can be rendered luminescent with the help of labels or probes. Such parameters include oxygen, pH, CO2, ammonia, and glucose. There are also numerous applications where the 2D distribution of a chemical or physical parameter is of interest. The use of a “sensor paint” is ideal in such situations. The state of this new technology is discussed herein with emphasis on current and future trends, for example, the use of pressure- and temperature-sensitive paints; known technological limitations are also discussed. These “paints” respond to a (bio)chemical parameter with a change in their optical properties. The object of interest is painted and the color or fluorescence of the paint is monitored by optical imaging. This technique enables monitoring of physical and chemical parameters, over relatively large areas and in real time.