cometadata/datacite-rtg-text-other-reclassification-records huggingface dataset:
KEPLER's First Rocky Planet: Kepler-10b
Creators: name: Batalha, Natalie M.
name: Borucki, William J.
name: Bryson, Stephen T.
name: Buchhave, Lars A.
name: Caldwell, Douglas A.
name: Christensen-Dalsgaard, Jorgen
name: Ciardi, David
name: Dunham, Edward W.
name: Fressin, Francois
name: Gautier, Thomas N.
name: Gilliland, Ronald L.
name: Haas, Michael R.
name: Howell, Steve B.
name: Jenkins, Jon M.
name: Kjeldsen, Hans
name: Koch, David G.
name: Latham, David W.
name: Lissauer, Jack J.
name: Marcy, Geoffrey W.
name: Rowe, Jason F.
name: Sasselov, Dimitar D.
name: Seager, Sara
name: Steffen, Jason H.
name: Torres, Guillermo
name: Basri, Gibor S.
name: Brown, Timothy M.
name: Charbonneau, David
name: Christiansen, Jessie
name: Clarke, Bruce
name: Cochran, William D.
name: Dupree, Andrea
name: Fabrycky, Daniel C.
name: Fischer, Debra
name: Ford, Eric B.
name: Fortney, Jonathan
name: Girouard, Forrest R.
name: Holman, Matthew J.
name: Johnson, John
name: Isaacson, Howard
name: Klaus, Todd C.
name: Machalek, Pavel
name: Moorehead, Althea V.
name: Morehead, Robert C.
name: Ragozzine, Darin
name: Tenenbaum, Peter
name: Twicken, Joseph
name: Quinn, Samuel
name: VanCleve, Jeffrey
name: Walkowicz, Lucianne M.
name: Welsh, William F.
name: Devore, Edna
name: Gould, Alan
Publisher: name: arXiv
Year: 2011
Subjects: subject: Earth and Planetary Astrophysics (astro-ph.EP)
subject: FOS: Physical sciences

description: NASA's Kepler Mission uses transit photometry to determine the frequency of earth-size planets in or near the habitable zone of Sun-like stars. The mission reached a milestone toward meeting that goal: the discovery of its first rocky planet, Kepler-10b. Two distinct sets of transit events were detected: 1) a 152 +/- 4 ppm dimming lasting 1.811 +/- 0.024 hours with ephemeris T[BJD]=2454964.57375+N*0.837495 days and 2) a 376 +/- 9 ppm dimming lasting 6.86 +/- 0.07 hours with ephemeris T[BJD]=2454971.6761+N*45.29485 days. Statistical tests on the photometric and pixel flux time series established the viability of the planet candidates triggering ground-based follow-up observations. Forty precision Doppler measurements were used to confirm that the short-period transit event is due to a planetary companion. The parent star is bright enough for asteroseismic analysis. Photometry was collected at 1-minute cadence for >4 months from which we detected 19 distinct pulsation frequencies. Modeling the frequencies resulted in precise knowledge of the fundamental stellar properties. Kepler-10 is a relatively old (11.9 +/- 4.5 Gyr) but otherwise Sun-like Main Sequence star with Teff=5627 +/- 44 K, Mstar=0.895 +/- 0.060 Msun, and Rstar=1.056 +/- 0.021 Rsun. Physical models simultaneously fit to the transit light curves and the precision Doppler measurements yielded tight constraints on the properties of Kepler-10b that speak to its rocky composition: Mpl=4.56 +/- 1.29 Mearth, Rpl=1.416 +/- 0.036 Rearth, and density=8.8 +/- 2.9 gcc. Kepler-10b is the smallest transiting exoplanet discovered to date.
description: Accepted, Astrophysical Journal, November 25, 2010; Eexpected publication date: February 20, 2011
Grain-size distribution dataset of supercritical flow sediments from a Gilbert-type delta that are associated with disaggregation bands
Creators: name: Tanner, David C.
name: Brandes, Christian
name: Winsemann, Jutta
Publisher: name: Amsterdam [u.a.] : Elsevier
Year: 2023
Subjects: subject: Delta sediments
subject: Disaggregation bands
subject: Faults
subject: Grain-size
subject: Supercritical flow deposits
subject: Dewey Decimal Classification::500 | Naturwissenschaften::570 | Biowissenschaften, Biologie

description: This is a dataset of grain-size distribution in sub- and supercritical flow sediments of a Gilbert-type delta from an outcrop in North Germany. Thirteen samples of ca 2.5 kg were dried (at 105°C), and homogenised twice with a sample divider. A representative sample of 1-2 g was then analysed using laser diffraction. The grain-size distribution of the sand has a maximum between fine to medium sand, with a long fine fraction tail down to 0.06 µm and occasional coarse fractions (up to 1.5 mm) in some samples. Specific grain-size distributions correlate with the different sedimentary bedforms from which the samples were taken. This data is important for two reasons: Firstly, sedimentary structures formed by Froude supercritical flows are controlled by grain-size. However, few studies have provided grain-size datasets from the natural record, which often have a much wider grain-size distribution than experimentally-produced supercritical flow deposits. Secondly, the sands were deformed subsequently by disaggregation bands, a type of geological fault that only develops in porous granular materials, i.e. well-sorted, medium sand. The disaggregation bands are indicative of seismic or even aseismic, creeping movement of basement faults.
Cost-profit Anslysis of Stochastic Heterogeneous Queue with Reverse Balking, Feedback and Retention of Impatient Customers
Creators: name: Bhupender Kumar Som
Publisher: name: Reliability: Theory & Applications
Year: 2019
Subjects: reverse balking
heterogeneous service
queuing theory
customer impatience

description: Consider a system operating as an M/M/2/N queue. Increasing system size influences newly arriving customers to join the system (reverse balking). As the system size increases, the customers’ waiting in the queue become impatient. After a threshold value of time, the waiting customer abandons the queue (reneging). These reneging customers can be retained with some probability (retention). Few customers depart dissatisfied with the service and rejoin the system as feedback customers. In this paper a feedback queuing system with heterogeneous service, reverse balking, reneging and retention is developed. The model is solved in steady-state recursively. Necessary measures of performance are drawn. Numerical interpretation of the model is presented. Cost-profit analysis of the system is performed by developing a cost model. Sensitivity analysis of the model is also presented arbitrarily.
Variability of Eastern North Atlantic Summertime Marine Boundary Layer Clouds and Aerosols Across Different Synoptic Regimes Identified with Multiple Conditions
Creators: name: Zheng, Xue
name: Qiu, Shaoyue
name: Zhang, Damao
name: Adebiyi, Adeyemi A.
name: Zheng, Xiaojian
name: Faruque, Omar
name: Tao, Cheng
name: Wang, Jianwu
Publisher: name: Maryland Shared Open Access Repository
Year: 2024
Subjects: UMBC Big Data Analytics Lab

description: This study estimates the meteorological covariations of aerosol and marine boundary layer (MBL) cloud properties in the Eastern North Atlantic (ENA) region, characterized by diverse synoptic conditions. Using a deep-learning-based clustering model with mid-level and surface daily meteorological data, we identify seven distinct synoptic regimes during the summer from 2016 to 2021. Our analysis, incorporating reanalysis data and satellite retrievals, shows that surface aerosols and MBL clouds exhibit clear regime-dependent characteristics, while lower tropospheric aerosols do not. This discrepancy likely arises synoptic regimes determined by daily large-scale conditions may overlook air mass histories that predominantly dictate lower tropospheric aerosol conditions. Focusing on three regimes dominated by northerly winds, we analyze the Atmospheric Radiation Measurement Program (ARM) ENA observations on Graciosa Island in the Azores. In the subtropical anticyclone regime, fewer cumulus clouds and more single-layer stratocumulus clouds with light drizzles are observed, along with the highest cloud droplet number concentration (Nd), surface Cloud Condensation Nuclei (CCN) and surface aerosol levels. The post-trough regime features more broken or multi-layer stratocumulus clouds with slightly higher surface rain rate, and lower Nd and surface CCN levels. The weak trough regime is characterized by the deepest MBL clouds, primarily cumulus and broken stratocumulus clouds, with the strongest surface rain rate and the lowest Nd, surface CCN and surface aerosol levels, indicating strong wet scavenging. These findings highlight the importance of considering the covariation of cloud and aerosol properties driven by large-scale regimes when assessing aerosol indirect effects using observations.
Structure of Uniformly Rotating Stars
Creators: name: Deupree, Robert G.
Publisher: name: arXiv
Year: 2011
Subjects: subject: Solar and Stellar Astrophysics (astro-ph.SR)
subject: FOS: Physical sciences

description: Zero age main sequence models of uniformly rotating stars have been computed for ten masses between 1.625 and 8 M_\odot and 21 rotation rates from zero to nearly critical rotation. The surface shape is used to distinguish rotation rather than the surface equatorial velocity or the rotation rate. Using the surface shape is close to, but not quite equivalent to using the ratio of the rotation rate to the critical rotation rate. Using constant shape as the rotation variable means that it and the mass are separable, something that is not true for either the rotation rate or surface equatorial velocity. Thus a number of properties, including the ratio of the effective temperature anywhere on the surface to the equatorial temperature, are nearly independent of the mass of the model, as long as the rotation rate changes in such a way to keep the surface shape constant.
description: ApJ accepted
Transition-Metal-Substituted Dichlorobismuthanes as Starting Materials for Novel Bismuth−Transition-Metal Clusters
Creators: name: Gröer, Thomas
name: Scheer, Manfred
Publisher: name: Universität Regensburg
Year: 2000
Subjects: subject: 540 Chemie

description: The reaction of [{Cp(CO)2Fe}BiCl2] (1a) with [Co(CO)4]- leads to the formation of the first heteroleptic substituted bismuthane, [(μ3-Bi){Co(CO)4}2{Fe(CO)2Cp}] (2). When the “open” complex 2 is irradiated, the heterocubane [Bi4{Co(CO)3}4] (3) is formed. [{Cp‘ ‘(CO)2Fe}BiCl2] (1b; Cp‘ ‘ = η5-C5H3-tBu2) reacts with [Fe(CO)4]2- to give the nido cluster [{Fe3(CO)9}{μ-BiFe(CO)2Cp‘ ‘}2] (4) and to give the complex [Bi4{μ3-Fe(CO)3}3{Fe(CO)2Cp‘ ‘}2] (5); the latter contains a distorted-tetrahedral Bi4 cluster core in which three of the faces are capped by Fe(CO)3 moieties. The reaction of 1b with Na2[W2(CO)10] yields the Bi-bridged tetrahedral W2Bi2 cluster [{W2(CO)8}(μ,η2-Bi2){μ-BiFe(CO)2Cp‘ ‘}] (6). In contrast to this, the molybdenum-substituted analogue [{Cp‘ ‘(CO)3Mo}BiCl2] (7) reacts with Na2[Fe(CO)4] to yield the arachno cluster [{Fe2(CO)6}{Fe(CO)4}{μ3-BiMo(CO)3Cp‘ ‘}2] (9). When 7 is reacted with Na2[W(CO)5], the complex [{Cp‘ ‘(CO)3Mo}2BiCl] (10) is obtained. The decomposition of compound 7 in THF leads to the ionic complex [(Cp‘ ‘MoCO)2(μ-Cl)3]2[Bi2Cl8(thf)2] (8). The crystal structures of all products are presented.
Cyclooligomerization Reactions of Different Phosphaalkynes in the Presence of [W(CO)5thf] - A Route to Tungsten-Stabilised Phosphorus Heterocycles
Creators: name: Kramkowski, Peter
name: Scheer, Manfred
Publisher: name: Universität Regensburg
Year: 2000
Subjects: subject: 540 Chemie

description: The reactivity of various phosphaalkynes versus [W(CO)5thf] has been studied. The reaction with Mes*CP (Mes* = 2,4,6-tBu3C6H2) exclusively leads to the low yield formation of [W(CO)2{(2-PCMes*)W(CO)5}2] (1). The reaction of the less bulky tBuCP with [W(CO)5thf] results in high yields in [W(CO)2{4-(tBuC)2P2W(CO)5}{2-(tBuCP)W(CO)5}] (2) which possesses a 1,3-diphosphete ligand as well as a side-on coordinated tBuCP unit. Experiments employing MesCP (Mes = 2,4,6-Me3C6H2) give the complexes [W(CO)4{4-(MesC)2P2}] (3), [W(CO)2{4-(MesC)2P2}{2-(MesCP)W(CO)5}] (4) and [W(CO)2{4-(MesC)2P2W(CO)5}2-(MesCP)W(CO)5{µ-W(CO)4}] (5) which have a 1,3-diphosphete ligand in their coordination sphere and are partly substituted with an additional side-on coordinated MesCP unit. In 5, two P atoms of the 1,3-diphosphete and the side-on coordinated MesCP are further bridged by a W(CO)4 moiety. Additionally, the unusual product [{W(CO)3}6-1,2,4-(RC)3P3{RCPW(CO)5}2] (R = Mes) (6) resulting from a pentamerization of MesCP initiated by [W(CO)5thf], could be obtained in moderate yield. Comprehensive spectroscopical and structural investigations of all products are presented.
Übergangsmetallinduzierte Pentamerisierung eines Phosphaalkins
Creators: name: Kramkowski, Peter
name: Scheer, Manfred
Publisher: name: Universität Regensburg
Year: 2000
Subjects: subject: Carbonylkomplexe; Phosphaalkine; Wolfram
subject: 540 Chemie

description: Das Metalla-Phosphanorbornadien 1, das durch zwei Phosphaalkin-Einheiten in 1,4-Position erweitert ist, entsteht durch eine beispiellose Pentamerisierung des Phosphaalkins MesCP (Mes=2,4,6-Me3C6H2) in der Koordinationssphäre des Übergangsmetallkomplexes [W(CO)5(thf)].
Fractal Systems of Central Places Based on Intermittency of Space-filling
Creators: name: Chen, Yanguang
Publisher: name: arXiv
Year: 2011
Subjects: subject: Physics and Society (physics.soc-ph)
subject: FOS: Physical sciences

description: The central place models are fundamentally important in theoretical geography and city planning theory. The texture and structure of central place networks have been demonstrated to be self-similar in both theoretical and empirical studies. However, the underlying rationale of central place fractals in the real world has not yet been revealed so far. This paper is devoted to illustrating the mechanisms by which the fractal patterns can be generated from central place systems. The structural dimension of the traditional central place models is d=2 indicating no intermittency in the spatial distribution of human settlements. This dimension value is inconsistent with empirical observations. Substituting the complete space filling with the incomplete space filling, we can obtain central place models with fractional dimension D
description: 30 pages, 8 figures, 5 tables
Novel Main Group-Transition Metal Cluster Compounds Incorporating Antimony, Iron and Cobalt
Creators: name: Gröer, Thomas
name: Palm, Tobias
name: Scheer, Manfred
Publisher: name: Universität Regensburg
Year: 2000
Subjects: subject: Antimony; Iron; Cobalt; Cluster; Polyhedra
subject: 540 Chemie

description: The reaction of [{Cpx(CO)2Fe}SbCl2] [1a: Cpx = 5-C5H3tBu2-1,3 (Cp"); 1b: Cpx = 5-C5Me5 (Cp*)] with Na2[Fe(CO)4] or K[Co(CO)4] affords the novel antimony-transition metal cluster compounds [{3-SbFe(CO)2Cp"}3{Fe(CO)3}4] (2), [{Fe3(CO)9}{3-SbFe(CO)2Cp"}2] (3) and [{4-SbFe(CO)2Cp*}2{Co4(CO)10(-CO)}] (4). All products were characterised by X-ray structure analyses and other methods. Cluster 2 reveals a novel Sb3Fe4 core, which does not follow the Wade-Mingos rules. Cluster 3 forms a square-pyramidal nido-cluster. The Sb2Co4 cluster core of 4 derives from a pentagonal bipyramid and consists of apical Sb and equatorial Co atoms with one missing pentagonal core atom.
Nackter Phosphor als gewinkelt verbrückender Ligand
Creators: name: Kramkowski, Peter
name: Scheer, Manfred
Publisher: name: Universität Regensburg
Year: 2000
Subjects: subject: Mehrfachbindungen; Metathesen; P-Liganden; Wolfram
subject: 540 Chemie

description: Die Metathesereaktion von [W2(OAr)6] (Ar=2,6-Me2C6H3) mit tBuCP führt zur Bildung eines Komplexes, der den ersten gewinkelt verbrückenden P1-Liganden der Koordinationszahl 2 enthält (siehe Struktur, Atom P2). Dieser Koordinationstyp war bisher ausschließlich dem Stickstoff vorbehalten und bei den schweren Homologen unbekannt. Das freie Elektronenpaar des Phosphidoliganden ist koordinationschemisch aktiv und koordiniert Lewis-saure {M(CO)5}-Fragmente (M=Cr, W).
A Human-Centric Comparative Analysis of Trajectory Design Methods for Multi-Body Dynamics
Creators: name: Martinez-Samaniego, Edison
name: Aros, Michelle
name: Bader, Laith
name: Schmitt, Justin
name: Auerback, Lily
name: Anderson, Joseph
name: Cooks, Karis
name: Canales Garcia, David
name: Chaparro, Barbara
name: Guzzetti, Davide
Publisher: name: Maryland Shared Open Access Repository
Year: 2024

description: 2024 AAS/AIAA Astrodynamics Specialist Conferene ,At: Broomfield, Colorado, August 2024
description: Trajectory design in the CR3BP is a complex but crucial process for understanding systems in the realm of multiple celestial bodies. By focusing on a human factor's perspective, this research aims to evaluate the use of augmented reality (AR) and virtual reality (VR) for solving trajectories. While preliminary work indicates AR's potential in enhancing user interface intuitiveness and visualization when compared to traditional software like FreeFlyer or STK, this study focuses on the usability, efficiency, and visualization aspects of all tools, providing insights into each method's effectiveness and user-friendliness. Overall, this research contributes to advancing mission planning efficiency and human-centered design principles in spacecraft trajectory design and examining the opportunity cost of maintaining the current status quo.
Chromium complexes with mixed Group 15 elements as ligands. Synthesis and characterisation of the first cyclo-P2As ligand in [CrCp(CO)2(3-P2As)]
Creators: name: Umbarkar, Shubhangi B.
name: Sekar, Perumal
name: Scheer, Manfred
Publisher: name: Universität Regensburg
Year: 2000
Subjects: subject: 540 Chemie

description: Reaction of [{CrCp(CO)2}2(µ-2-P2)] 1 with PCl5 or ECl3 (E = P, As or Sb) led to cyclo-P2E ligand complexes [CrCp(CO)2(3-P3)] 2 and [CrCp(CO)2(3-P2As)] 4. The eliminated [CpCr(CO)2] fragment of 1 is converted into [CrCp(µ-Cl)Cl]2 3. Co-crystals of 4 and 2 were characterised by Total Reflection X-ray Fluorescence Analysis and by single crystal X-ray diffraction analysis, revealing the tetrahedral CrP2As core.
Untersuchungen zur Darstellung von [CpxSb{M(CO)5}2] (Cpx = Cp, Cp*; M = Cr, W)
Creators: name: Schiffer, Michael
name: Johnson, Brian P.
name: Scheer, Manfred
Publisher: name: Universität Regensburg
Year: 2000
Subjects: subject: Antimony; Cyclopentadienyl complexes; Crystal structure
subject: 540 Chemie

description: Die Reaktion von CpSbCl2 mit [Na2{Cr2(CO)10}] führt zum Chlorostibinidenkomplex [ClSb{Cr(CO)5}2(thf)] (1), wohingegen sich bei der Umsetzung von CpSbCl2 mit [Na2{W2(CO)10}] die Komplexe [ClSb{W(CO)5}3] (2), [Na(thf)][Cl2Sb{W(CO)5}2] (3), [ClSb{W(CO)5}2(thf)] (4) und [Sb2{W(CO)5}3] (5) bilden. Die Darstellung des Stibinidenkomplexes [CpSb{Cr(CO)5}2] (6) gelingt durch die Reaktion von [ClSb{Cr(CO)5}2] mit NaCp, während sein Cp*-substituiertes Analogon [Cp*Sb{Cr(CO)5}2] (7) direkt durch Metathese von Cp*SbCl2 mit [Na2{Cr2(CO)10}] zugänglich wird. Die Produkte 2, 3, 4 und 7 werden zusätzlich zu ihren spektroskopischen Daten durch Kristallstrukturanalysen charakterisiert.
The Myxobacterial Antibiotic Myxovalargin: Biosynthesis, Structural Revision, Total Synthesis, and Molecular Characterization of Ribosomal Inhibition
Creators: name: Koller, Timm O.
name: Scheid, Ullrich
name: Kösel, Teresa
name: Herrmann, Jennifer
name: Krug, Daniel
name: Boshoff, Helena I. M.
name: Beckert, Bertrand
name: Evans, Joanna C.
name: Schlemmer, Jan
name: Sloan, Becky
name: Weiner, Danielle M.
name: Via, Laura E.
name: Moosa, Atica
name: Ioerger, Thomas R.
name: Graf, Michael
name: Zinshteyn, Boris
name: Abdelshahid, Maha
name: Nguyen, Fabian
name: Arenz, Stefan
name: Gille, Franziska
name: Siebke, Maik
name: Seedorf, Tim
name: Plettenburg, Oliver
name: Green, Rachel
name: Warnke, Anna-Luisa
name: Ullrich, Joachim
name: Warrass, Ralf
name: Barry, Clifton E.
name: Warner, Digby F.
name: Mizrahi, Valerie
name: Kirschning, Andreas
name: Wilson, Daniel N.
name: Müller, Rolf
Publisher: name: Washington, DC : ACS Publications
Year: 2023
Subjects: subject: antiinfective agent
subject: myxovalargins
subject: chemistry
subject: metabolism
subject: Mycobacterium tuberculosis
subject: Myxococcales
subject: protein synthesis
subject: ribosome
subject: Anti-Bacterial Agents
subject: Protein Biosynthesis
subject: Ribosomes
subject: Dewey Decimal Classification::500 | Naturwissenschaften::540 | Chemie

description: Resistance of bacterial pathogens against antibiotics is declared by WHO as a major global health threat. As novel antibacterial agents are urgently needed, we re-assessed the broad-spectrum myxobacterial antibiotic myxovalargin and found it to be extremely potent against Mycobacterium tuberculosis. To ensure compound supply for further development, we studied myxovalargin biosynthesis in detail enabling production via fermentation of a native producer. Feeding experiments as well as functional genomics analysis suggested a structural revision, which was eventually corroborated by the development of a concise total synthesis. The ribosome was identified as the molecular target based on resistant mutant sequencing, and a cryo-EM structure revealed that myxovalargin binds within and completely occludes the exit tunnel, consistent with a mode of action to arrest translation during a late stage of translation initiation. These studies open avenues for structure-based scaffold improvement toward development as an antibacterial agent.
CPO prediction: accuracy assessment and impact on UT1 intensive results
Creators: name: Malkin, Zinovy
Publisher: name: arXiv
Year: 2011
Subjects: subject: Geophysics (physics.geo-ph)
subject: FOS: Physical sciences

description: The UT1 Intensives results heavily depend on the celestial pole offset (CPO) model used during data processing. Since accurate CPO values are available with delay from two to four weeks, CPO predictions are necessarily applied to the UT1 intensive data analysis, and errors in predictions can influence the operational UT1 accuracy. In this papers the real accuracy of CPO prediction is assessed using the actual IERS and PUL predictions made in 2007-2009. Also, results of operational processing was analyzed to investigate the actual impact of EOP prediction errors on the rapid UT1 results. It was found that the impact of CPO prediction errors is at a level of several microseconds, whereas the impact of the inaccuracy in the polar motion prediction may be about one order larger for ultra-rapid UT1 results. The situation can be amended if the IERS Rapid solution will be updated more frequently.
description: 6 pp
Zur oxidativen Addition von komplexierten Phosphanen bzw. Arsanen an Platin(0)-Komplexen
Creators: name: Vogel, Ulf
name: Scheer, Manfred
Publisher: name: Universität Regensburg
Year: 2001
Subjects: subject: Phosphorus; Arsenic; Platinum; Crystal structure; NMR spectroscopy
subject: 540 Chemie

description: Oxidative Addition Reactions of Complexed Phosphine and Arsine at Platinum(0) Complexes The reactions of E(SiMe3)3 with [W(CO)5thf] yield after alcoholysis in a one-pot reaction the complexes [(CO)5WEH3] (1) (E = P(a), As(b)). This procedure circumvents the direct use of gaseous phosphine and arsine, respectively. Complexes 1 react with [(C2H4)Pt(PPh3)2] in an oxidative addition type reaction to form the heterometallic complexes [(PPh3)2Pt(H){(-EH2)W(CO)5}] (E = P(2), As(3)). Complexes 2 and 3 were obtained as mixtures of their cis- and trans-isomers, in which the contents of the trans-isomer dominates. The products were comprehensively spectroscopically characterised, and the structures of the trans-complexes 2 and 3 were determined by X-ray crystal structure analysis.
Strategies for supporting students with disabilities by teachers committed to equality
Creators: name: Fleming, Jennifer L.
name: Mullen, Carol A.
Publisher: name: F1000 Research Limited
Year: 2022

description: Fleming, J. L., & Mullen, C. A. (2021, November). Strategies for supporting students with disabilities by teachers committed to equity. Poster presented at the Virginia Association of Colleges for Teacher Education and the Association of Teacher Educators virtual conference.
Transient Analysis of a Single-Server Queuing System with Correlated Inputs and Reneging
Creators: name: Kumar, Rakesh
name: Bhavneet Singh Soodan
Publisher: name: Reliability: Theory & Applications
Year: 2019
Subjects: Correlated input
Exponential
Queuing model
Reneging
Transient analysis

description: In this paper, we study a continuous time single-server queuing system, wherein the arrivals at two consecutive transition marks are correlated. The service times and the reneging times are exponential distributed. The time-dependent behavior of the model is studied using Runge-Kutta method.
Novel Ringdown Amplitude-Phase Consistency Test
Creators: name: Forteza, Xisco Jiménez
name: Bhagwat, Swetha
name: Kumar, Sumit
name: Pani, Paolo
Publisher: name: College Park, Md. : APS
Year: 2023
Subjects: subject: Gravitation
subject: Merging
subject: Relativity
subject: Stars
subject: Consistency tests
subject: Damping time
subject: General Relativity
subject: Holes coalescence
subject: Linear superpositions
subject: Phase consistencies
subject: Ring-down signals
subject: Spectra's
subject: Strong field
subject: Black holes
subject: black hole
subject: measurement error
subject: spectroscopy
subject: Dewey Decimal Classification::500 | Naturwissenschaften::550 | Geowissenschaften

description: The ringdown signal emitted during a binary black hole coalescence can be modeled as a linear superposition of the characteristic damped modes of the remnant black hole that get excited during the merger phase. While checking the consistency of the measured frequencies and damping times against the Kerr BH spectrum predicted by general relativity (GR) is a cornerstone of strong-field tests of gravity, the consistency of measured excitation amplitudes and phases have been largely left unexplored. For a nonprecessing, quasicircular binary black hole merger, we find that GR predicts a narrow region in the space of mode amplitude ratio and phase difference, independently of the spin of the binary components. Using this unexpected result, we develop a new null test of strong-field gravity which demands that the measured amplitudes and phases of different ringdown modes should lie within this narrow region predicted by GR. We call this the amplitude-phase consistency test and introduce a procedure for performing it using information from the ringdown signal. Lastly, we apply this test to the GW190521 event, using the multimodal ringdown parameters inferred by Capano et al. [arXiv:2105.05238]. While ringdown measurements errors for this event are large, we show that GW190521 is consistent with the amplitude-phase consistency test. Our test is particularly well suited for accommodating multiple loud ringdown detections as those expected in the near future, and can be used complementarily to standard black-hole spectroscopy as a proxy for modified gravity, compact objects other than black holes, binary precession and eccentricity.
Associated Press-NORC Center for Public Affairs Research Poll: Gun Laws, Ownership, and Violence in America
Creators: name: Research, The Associated Press-NORC Center For Public Affairs
Publisher: name: Roper Center for Public Opinion Research
Year: 2019

description: Personal importance of various issues (6); President Donald Trump's handling of various issues (7); Republicans/Democrats would do a better job handling various issues (3); various groups of people pay too much/too little in federal taxes (6); tax cuts for various groups of people would help/hurt national economy (5); impact of Trump's proposed tax plan (3); gun laws in U.S. should be more/less strict (1); impact of stricter gun laws on gun violence (5); gun ownership (1).
Trojan Horse Siderophore Conjugates Induce Pseudomonas aeruginosa Suicide and Qualify the TonB Protein as a Novel Antibiotic Target
Creators: name: Peukert, Carsten
name: Gasser, Véronique
name: Orth, Till
name: Fritsch, Sarah
name: Normant, Vincent
name: Cunrath, Olivier
name: Schalk, Isabelle J.
name: Brönstrup, Mark
Publisher: name: Washington, DC : ACS
Year: 2023
Subjects: subject: antiinfective agent
subject: carrier protein
subject: membrane protein
subject: siderophore
subject: chemistry
subject: metabolism
subject: Pseudomonas aeruginosa
subject: transport at the cellular level
subject: Anti-Bacterial Agents
subject: Biological Transport
subject: Membrane Proteins
subject: Membrane Transport Proteins
subject: Siderophores
subject: Dewey Decimal Classification::500 | Naturwissenschaften::540 | Chemie
subject: Dewey Decimal Classification::600 | Technik::610 | Medizin, Gesundheit

description: Rising infection rates with multidrug-resistant pathogens calls for antibiotics with novel modes of action. Herein, we identify the inner membrane protein TonB, a motor of active uptake in Gram-negative bacteria, as a novel target in antimicrobial therapy. The interaction of the TonB box of outer membrane transporters with TonB is crucial for the internalization of essential metabolites. We designed TonB box peptides and coupled them with synthetic siderophores in order to facilitate their uptake into bacteria in up to 32 synthetic steps. Three conjugates repressed the growth of Pseudomonas aeruginosa cells unable to produce their own siderophores, with minimal inhibitory concentrations between 0.1 and 0.5 μM. The transporters mediating uptake of these compounds were identified as PfeA and PirA. The study illustrates a variant of cellular suicide where a transporter imports its own inhibitor and demonstrates that artificial siderophores can import cargo with molecular weights up to 4 kDa.
Nova M31N 2007-12b: Supersoft X-rays reveal an intermediate polar?
Creators: name: Pietsch, W.
name: Henze, M.
name: Haberl, F.
name: Hernanz, M.
name: Sala, G.
name: Hartmann, D. H.
name: Della Valle, M.
Publisher: name: arXiv
Year: 2011
Subjects: subject: High Energy Astrophysical Phenomena (astro-ph.HE)
subject: FOS: Physical sciences

description: For the He/N nova M31N 2007-12b, we analyzed XMM-Newton EPIC and Chandra HRC-I observations of our monitoring program performed at intervals of ten days and added results of a XMM-Newton target of opportunity observation and Swift XRT observations. The supersoft source (SSS) emission started between 21 and 30 d after the optical outburst and ended between 60 and 120 d after outburst, making M31N 2007-12b one of the few novae with the shortest SSS phase known. The X-ray spectrum was supersoft and can be fitted with a white dwarf (WD) atmosphere model with solar abundances absorbed by the Galactic foreground. The temperature of the WD atmosphere seems to increase at the beginning of the SSS phase from ~70 to ~80 eV. The luminosity of M31N 2007-12b during maximum was at the Eddington limit of a massive WD and dropped by ~30% in the observation 60 d after outburst. The radius of the emission region is ~6x10^8 cm. In the four bright state observations, we detected a stable 1110 s pulsation, which we interpret as the WD rotation period. In addition, we detect dips in three observations that might represent a 4.9 h or 9.8 h binary period of the system. Nova envelope models with <50% mixing between solar-like accreted material and the degenerate core of the WD can be used to describe the data. We derive a WD mass of 1.2 Msun, as well as an ejected and burned mass of 2.0x10^{-6} Msun} and 0.2x10^{-6} Msun, respectively. The observed periodicities indicate that nova M31N 2007-12b erupted in an intermediate polar (IP) system. The WD photospheric radius seems to be larger than expected for a non-magnetic WD but in the range for magnetic WDs in an IP system. (abridged)
description: 10 pages, 5 figures, A&A accepted
BERALL: Towards Generating Retrieval-augmented State-based Interactive Fiction Games
Creators: name: Chambers, Rachel
name: Tack, Naomi
name: Pearson, Eliot
name: Martin, Lara J
name: Ferraro, Francis
Publisher: name: Maryland Shared Open Access Repository
Year: 2024

description: Interactive fiction (IF) games are a genre of games where the player interacts with the fictional world via text-based commands, solving puzzles primarily by exploring the world and using items they collect along the way. Although there has been much work on playing IF using AI, there is relatively less work on the creation of such games using AI. While large language models (LLMs) have made the generation of text far easier in the past several years, they still struggle to generate the highly-structured and consistent story worlds that one might see in IF. We present a threepart system called BERALL, which generates unique text adventure games by 1) maintaining the current state of the story world, 2) using retrieval-augmented generation (RAG) to create relevant location descriptions, and 3) combining these components to create a coherent experience for the player. Our approach is effective at generating room and story descriptions from the setting and knowledge graphs, demonstrating the potential benefits of LLMs in IF generation. We find challenges remain in maintaining the current game state due, in part, to LLMs not understanding the impact of changes to the knowledge graph generated by the player’s command.
Elucidation of novel physiological and genetic elements associated with the cold adaptability and survival of Listeria monocytogenes in the food processing continuum
Creators: name: Hingston, Patricia
Publisher: name: University of British Columbia
Year: 2017

description: Novel physiological and genetic factors associated with the survival of Listeria monocytogenes in the food-processing continuum were investigated, with an emphasis on its cold-growth ability. Food-related L. monocytogenes strains (n=166) were sequenced and subsequently evaluated on their ability to tolerate cold (4°C), salt (6% NaCl, 25°C), acid (pH 5, 25°C), and desiccation (33% RH, 20°C) stress. Stress tolerances were associated with serotype, clonal complex, full-length inlA profiles, and plasmid harbourage. Notably, strains possessing full length inlA (as opposed to a truncated version) exhibited significantly (p<0.001) enhanced cold tolerance and plasmid-positive strains demonstrated enhanced (p=0.013) acid tolerance. Relative gene expression indicated that several plasmid-encoded genes (e.g., NADH peroxidase, clpL, proW) are induced in L. monocytogenes during growth in 6% NaCl and at pH 5. Additionally, a whole-genome sequence phylogeny revealed closely related stress sensitive and tolerant strains, highlighting that minor genetic differences impact strain phenotypes. Strand-specific RNA sequencing showed that L. monocytogenes suppresses 1.3× more genes than it induces at 4°C relative to 20°C. The largest number (n=1,431) and greatest magnitude (>1,000-fold) of differentially expressed (e.g., >2-fold, p<0.05) genes occurred in late stationary-phase cells. A core set of 22 genes were upregulated at all five growth phases investigated and included nine genes required for branched-chain fatty acid (BCFA) synthesis. Correspondingly, BCFA levels increased by 15% during cold stress exposure. Transcription of antisense RNA (asRNA) was 2.5× higher in cells grown at 4°C relative to 20°C, with the most asRNA transcripts upregulated in lag phase cells. Spontaneous L. monocytogenes variants displaying enhanced cold tolerance (ECT) were isolated from a cold-sensitive strain culture following 84 days of storage at 4°C. While the parent strain had an impaired ability to produce BCFAs, the ECT variants were able to overcome this limitation which is hypothesized to be a result of mutations identified in acetyl-coA carboxylase. Collectively this work has improved our understanding of the response of L. monocytogenes to to cold stress and genotypes associated with stress-tolerance phenotypes. This information may be useful for developing biomarkers to quickly predict the risks associated with food isolates, or aid in developing new and/or improved intervention strategies.
Missing for 20 yr: MeerKAT Redetects the Elusive Binary Pulsar M30B
Creators: name: Balakrishnan, Vishnu
name: Freire, Paulo C. C.
name: Ransom, S. M.
name: Ridolfi, Alessandro
name: Barr, E.D.
name: Chen, W.
name: Krishnan, Vivek Venkatraman
name: Champion, D.
name: Kramer, M.
name: Gautam, T.
name: Padmanabh, Prajwal V.
name: Men, Yunpeng
name: Abbate, F.
name: Stappers, B.W.
name: Stairs, I.
name: Keane, E.
name: Possenti, A.
Publisher: name: London : Institute of Physics Publ.
Year: 2023
Subjects: subject: Dewey Decimal Classification::500 | Naturwissenschaften::520 | Astronomie, Kartographie

description: PSR J2140−2311B is a 13 ms pulsar discovered in 2001 in a 7.8 hr Green Bank Telescope observation of the core-collapsed globular cluster M30 and predicted to be in a highly eccentric binary orbit. This pulsar has eluded detection since then; therefore, its precise orbital parameters have remained a mystery until now. In this work, we present the confirmation of this pulsar using observations taken with the UHF receivers of the MeerKAT telescope as part of the TRAPUM Large Survey Project. Taking advantage of the beamforming capability of our backends, we have localized it, placing it 1.′2(1) from the cluster center. Our observations have enabled the determination of its orbit: It is highly eccentric (e = 0.879) with an orbital period of 6.2 days. We also measured the rate of periastron advance, ω ̇ = 0.078 ± 0.002 deg yr − 1 . Assuming that this effect is fully relativistic, general relativity provides an estimate of the total mass of the system, M TOT = 2.53 ± 0.08 M ⊙, consistent with the lightest double neutron star systems known. Combining this with the mass function of the system gives the pulsar and companion masses of m p < 1.43 M ⊙ and m c > 1.10 M ⊙, respectively. The massive, undetected companion could either be a massive white dwarf or a neutron star. M30B likely formed as a result of a secondary exchange encounter. Future timing observations will allow the determination of a phase-coherent timing solution, vastly improving our uncertainty in ω ̇ and likely enabling the detection of additional relativistic effects, which will determine m p and m c
Insertion von Nitrilen in die P-C-Bindung von [(1-C5Me5)P{W(CO)5}2] - ein neuer Zugang zu Phosphorheterocyclen
Creators: name: Schiffer, Michael
name: Scheer, Manfred
Publisher: name: Universität Regensburg
Year: 2001
Subjects: subject: Insertionen; Phosphorheterocyclen; Wolfram
subject: 540 Chemie

description: Ganz unerwartet inserieren Nitrile bereits bei Raumtemperatur in die ungespannte P-C--Bindung von [Cp*P{W(CO)5}2]. Dabei entstehen je nach verwendetem Nitril Dihydro-1,3,2-diazaphosphinin- und Benzo-1,2-azaphosphol-Derivate, die durch [W(CO)5]-Einheiten stabilisiert werden (siehe Schema). Die Synthese des Azaphosphols wird von einer C-H-Bindungsaktivierung bei Raumtemperatur begleitet und stellt einen neuen und einfachen Zugang zu dieser Verbindungsklasse dar.
Surfactant Semiconductors as Trojan Horses in Cell-Membranes for On-Demand and Spatial Regulation of Oxidative Stress
Creators: name: Jaschke, Marian
name: Plenge, Masina
name: Kunkel, Marius
name: Lehrich, Tina
name: Schmidt, Julia
name: Stöckemann, Kilian
name: Heinemann, Dag
name: Siroky, Stephan
name: Ngezahayo, Anaclet
name: Polarz, Sebastian
Publisher: name: Weinheim : Wiley-VCH Verl.
Year: 2023
Subjects: subject: biocompatible amphiphiles
subject: reactive oxygen species
subject: self-assembly
subject: semiconductor surfactants
subject: Dewey Decimal Classification::600 | Technik

description: Oxidative stress is a cause for numerous diseases and aging processes. Thus, researchers are keen to tune the level of intracellular stress and to learn from that. An unusual approach is presented here. The methodology involves multifunctional surfactants. Although their molecular design is nonbiological—a fullerenol head group attached covalently to pi-conjugated dyes—the surfactants possess superior biocompatibility. Using an intrinsic fluorescence signal as a probe, it is shown that the amphiphiles become incorporated into the Caco-2 cells. There, they are able to exhibit additional functions. The compound reduces cellular stress in dark reaction pathways. The antagonistic property is activated under irradiation, the photocatalytic production of reactive oxygen species (ROS), resulting in cell damage. The feature is activated even by near-infrared light (NIR-light) via a two-photon process. The properties as molecular semiconductors lead to a trojan horse situation and allows the programming of the spatial distribution of cytotoxicity.
Mobility, cognitive function, and exercise : neuroimaging studies in older adults
Creators: name: Hsu, Chun Liang
Publisher: name: University of British Columbia
Year: 2017

description: As the world’s population ages, mobility and cognitive impairments are major health-care priorities. Given the particular relevance of the brain in the manifestation of both conditions, the aims of my dissertation are two-fold: 1) to advance our knowledge of the intrinsic relationship between mobility and cognitive impairments; and 2) to characterize the underlying functional neural mechanisms by which exercise promotes cognitive and mobility outcomes in older adults with mild cognitive impairment. Using magnetic resonance imaging, I focused on characterizing brain structures and brain function – as measured by functional neural activity as well as regional and network connectivity – associated with falls and slow gait. Additionally, I investigated how aerobic exercise may exert influence on mobility and cognitive function via pathways indicated by magnetic resonance imaging derived neural correlates. My research showed that while falls are associated with lower total and regional gray and white matter volume, slow gait, in conjunction with mild cognitive impairment, is reflected by disrupted neural network connectivity. Moreover, my work aligns with emerging concept of neural efficiency by generating evidence that suggests aerobic exercise training may promote mobility and cognitive function by maintaining or improving neural efficiency. Overall, these results contribute to a better understanding of the neural underpinnings of mobility and cognitive impairments, as well as provide new insight into the neural mechanisms by which exercise promotes mobility and cognitive function.
Discrete maximum principle and a Delaunay-type mesh condition for linear finite element approximations of two-dimensional anisotropic diffusion problems
Creators: name: Huang, Weizhang
Publisher: name: arXiv
Year: 2010
Subjects: subject: Numerical Analysis (math.NA)
subject: FOS: Mathematics
subject: 65N30, 65N50

description: The finite element solution of two-dimensional anisotropic diffusion problems is considered. A Delaunay-type mesh condition is developed for linear finite element approximations to satisfy a discrete maximum principle. The condition is shown to be weaker than the existing anisotropic non-obtuse angle condition. It reduces to the well known Delaunay condition for the special case with the identity diffusion matrix. Numerical results are presented to verify the theoretical findings.
description: 16 pages
Hyperparameter optimization: Foundations, algorithms, best practices, and open challenges
Creators: name: Bischl, Bernd
name: Binder, Martin
name: Lang, Michel
name: Pielok, Tobias
name: Richter, Jakob
name: Coors, Stefan
name: Thomas, Janek
name: Ullmann, Theresa
name: Becker, Marc
name: Boulesteix, Anne‐Laure
name: Deng, Difan
name: Lindauer, Marius
Publisher: name: Hoboken, NJ : Wiley
Year: 2023
Subjects: subject: automl
subject: hyperparameter optimization
subject: machine learning
subject: model selection
subject: tuning
subject: Dewey Decimal Classification::000 | Allgemeines, Wissenschaft::000 | Informatik, Wissen, Systeme::004 | Informatik

description: Most machine learning algorithms are configured by a set of hyperparameters whose values must be carefully chosen and which often considerably impact performance. To avoid a time-consuming and irreproducible manual process of trial-and-error to find well-performing hyperparameter configurations, various automatic hyperparameter optimization (HPO) methods—for example, based on resampling error estimation for supervised machine learning—can be employed. After introducing HPO from a general perspective, this paper reviews important HPO methods, from simple techniques such as grid or random search to more advanced methods like evolution strategies, Bayesian optimization, Hyperband, and racing. This work gives practical recommendations regarding important choices to be made when conducting HPO, including the HPO algorithms themselves, performance evaluation, how to combine HPO with machine learning pipelines, runtime improvements, and parallelization. This article is categorized under: Algorithmic Development > Statistics Technologies > Machine Learning Technologies > Prediction.
Lewis Acid/Base Stabilized Phosphanylalane and -gallane [Lewis-Säure/Base-stabilisiertes Phosphanylalan und -gallan]
Creators: name: Vogel, Ulf
name: Timoshkin, Alexey Y.
name: Scheer, Manfred
Publisher: name: Universität Regensburg
Year: 2001
Subjects: subject: aluminum; density functional calculations; gallium; Lewis acids; phosphorus
subject: 540 Chemie

description: Neither synthesis nor detection in matrix isolation experiments has been accomplished for the parent compounds of phosphanylalanes and -gallanes of type A. H2 elimination reactions between [(CO)5WPH3] and H3ENMe3 (E=Al, Ga) have enabled the first synthesis of Lewis acid/base stabilized complexes of the type B. Comprehensive density functional theory (DFT) calculations on the aluminum systems verify the high stability of the complexes of type B.
Insertion Reactions of Nitriles into the P-C Bond of [(1-C5Me5)P{W(CO)5}2] - A Novel Approach to Phosphorus-Containing Heterocycles
Creators: name: Schiffer, Michael
name: Scheer, Manfred
Publisher: name: Universität Regensburg
Year: 2001
Subjects: subject: insertion; phosphorus heterocycles; tungsten
subject: 540 Chemie

description: Unexpectedly, nitriles are inserted at room temperature into the unstrained P-C bond of [Cp*P{W(CO)5}2]. Depending on the nitrile used, dihydro-1,3,2-diazaphosphinine and benzo-1,2-azaphosphole derivatives, which are stablized by [W(CO)5] moieties, are formed (see scheme). The synthesis of the azaphosphole is accompanied by an additional C-H activation at room temperature and offers a novel and straightforward synthetic approach to this class of compounds.
Metal-coated nano-cylinder cavity for broadband nonclassical light emission
Creators: name: Maksymov, I.
name: Besbes, Mondher
name: Hugonin, Jean-Paul
name: Yang, J.
name: Beveratos, Alexios
name: Sagnes, Isabelle
name: Robert-Philip, Isabelle
name: Lalanne, Philippe
Publisher: name: arXiv
Year: 2010
Subjects: subject: Quantum Physics (quant-ph)
subject: Optics (physics.optics)
subject: FOS: Physical sciences

description: A novel metal-coated nanocylinder-cavity architecture fully compatible with III-V GaInAs technology and benefiting from a broad spectral range enhancement of the localdensity- of-states is proposed as an integrated source of non-classical light. Due to a judicious selection of the mode volume, the cavity combines good collection efficiency (\gg 45%), large Purcell factors (\gg 15) over a 80-nm spectral range, and a low sensitivity to inevitable spatial mismatches between the single emitter and the cavity mode. This represents a decisive step towards the implementation of reliable solid-state devices for the generation of entangled photon pairs at infrared wavelengths.
Genome sequence of bacteriophage GiJojo, isolated using Streptomyces mirabilis in Catonsville, Maryland
Creators: name: Badiola, Marie Louise P.
name: Befano, Kaela D.
name: Berger, McKayla L.
name: Blanco, Claudine R.
name: Ghunney, Nhyira
name: Lee, Jaehyun G.
name: Myat, Lin P.
name: Nguyen, James K.
name: Ober, Ellison
name: Press-Porter, Karla M.
name: She, Brendan T.
name: Watkins, Justin S.
name: 2023 UMBC Phage Hunters
name: Caruso, Steven
Publisher: name: ASM
Year: 2024

description: Bacteriophage GiJojo is a myovirus isolated from soil that infects Streptomyces mirabilis NRRL B-2400, with a genome length of 115,161 bp containing 180 genes and 29 tRNAs. Of those genes, 59 have been assigned functions. GiJojo is a member of the BS cluster of actinobacteriophages.