cometadata/datacite-rtg-text-other-reclassification-records huggingface dataset:
Implementation of a Warfarin Dosing Protocol in Rural Primary Care
Creators: name: Scearce, Shannon Nicole
Publisher: name: The University of North Carolina at Chapel Hill University Libraries
Year: 2018

description: Warfarin is an anticoagulant used to prevent blood clots in at-risk patients.  Although it is highly effective, determining the appropriate warfarin dosage for an individual patient can be challenging.  Frequent blood monitoring is needed to maintain the patient’s International Normalized Ratio (INR) within the therapeutic range. Incorrect warfarin dosing can result in an INR outside of the therapeutic range. This can lead to hemorrhage or thrombosis and result in permanent disability or death. Studies show that use of a warfarin dosing protocol can increase the INR time within the therapeutic range (TTR) and decrease warfarin-related morbidity and mortality.  The problem for this Doctor of Nursing Practice project was identification of a low percent TTR of INR values in patients whose warfarin was managed at the host site, with no clinic-wide dosing protocol in place.      The purpose of this project was to improve the percent TTR of INR values by implementing a warfarin dosing protocol to be used consistently by all providers.  The primary goal was to achieve 85% use of the protocol, with a secondary goal to increase TTR by 10% or more.        Data were collected by audit of the electronic medical record on all patients taking warfarin who presented for point-of-care INR testing. Pre-intervention data were collected from July 1 to September 30, 2017.  The protocol was implemented on July 1, 2018, and post-intervention data were collected from July 1 to September 30, 2018.  Pre-intervention and post-intervention percent TTR values were compared. Statistical analysis was conducted using the Chi-Square test.      The primary and secondary goals were exceeded.  Protocol use was 97.3%, and the TTR improved from 55.5% to 71.2%.  A post-hoc analysis was conducted to evaluate INR variability that expanded the therapeutic ranges by 0.1 on both ends. The post-hoc TTR improved from 62.8% to 81.5%. The primary and post-hoc analyses were statistically significant with a p value of 0.019 and 0.0000923, respectively.        This project can be applied to other primary care practices to improve TTR of INR values and may be particularly useful in rural primary care settings where anticoagulation clinics are not readily accessible
title: Different roads to success: (A multi-method approach) leveraging supply chain management practices to support organizational excellence in the energy sector Houston, Texas - USA
Creators: name: Williams, Alisha
Publisher: name: Edinburgh Napier University
publisherIdentifier: https://ror.org/03zjvnn91
publisherIdentifierScheme: ROR
Year: 2024

description: Growing worldwide demand for current conventional sources of energy, which is considered a fundamental ingredient to human life as we know it, has resulted in problems of scarcity and adverse environmental impact. It is predicted that conventional sources are at the inception of a very possible energy crisis in the next two or three decades. As such, companies in the energy industry will need to ensure robust, transformational sustainability, to allow for reinvestment in renewable sources of energy, in support of life as we know it.
Appreciating that there are different roads to success within organizations, this study explores the impact of supply chain management practices on organizational excellence, as keys to long-term organizational sustainability. There is evidence to suggest that in practice, success factors attributed to efficiency of supply chains are not being addressed. This is a concern since organizations can attain competitive advantage through strategically implemented supply chain management practices.
A mixed-methods research approach was leveraged, to allow the deficiencies found in each method, to be supplemented by the strengths of the other. This approach rendered richness and depth of data which is substantiated throughout the thesis. The data acquired facilitated the design and influenced the implementation of a conceptual model, in support of organizational excellence.
The study has embarked on several fundamental revelations such as the fact that the face of organizational sustainability has evolved over the years. No longer is sustainability derived from financial security but from key stakeholder relationships. People are not an organization’s greatest asset, but how an organization empowers its people is the greatest asset, and the factors which affect organizational performance is different for companies in the energy industry, based on execution models and regulatory requirements.
The study concludes that there is indeed a link between supply chain management practices and organizational excellence and captures fundamental challenges and pain points that should be addressed to allow for alignment. Performance factors and challenges specific to the energy industry have been identified and included for consideration.
A wealth of contributions has been identified throughout the research as a result of the valuable academic literature, the research methods utilized, and the offerings of the participants. Contributions to practice and knowledge have been carefully captured as opportunities to influence current business deficiencies and to allow for future research. The researcher’s recommendations and the conceptual model are intended to provide clarity for future researchers and industry practitioners alike.
The dynamics of unsteady frictional slip pulses
Creators: name: Pomyalov, Anna
name: Barras, Fabian
name: Roch, Thibault
name: Brener, Efim A.
name: Bouchbinder, Eran
Publisher: name: arXiv
Year: 2023
Subjects: subject: Materials Science (cond-mat.mtrl-sci)
subject: Soft Condensed Matter (cond-mat.soft)
subject: Pattern Formation and Solitons (nlin.PS)
subject: FOS: Physical sciences

description: Self-healing slip pulses are major spatiotemporal failure modes of frictional systems, featuring a characteristic size $L(t)$ and a propagation velocity $c_{\rm p}(t)$ ($t$ is time). Here, we develop a theory of slip pulses in realistic rate-and-state dependent frictional systems. We show that slip pulses are intrinsically unsteady objects -- in agreement with previous findings -- yet their dynamical evolution is closely related to their unstable steady-state counterparts. In particular, we show that each point along the time-independent $L^{\mbox{(0)}}(τ_{\rm d})\!-\!c^{\mbox{(0)}}_{\rm p}(τ_{\rm d})$ line, obtained from a family of steady-state pulse solutions parameterized by the driving shear stress $τ_{\rm d}$, is unstable. Nevertheless, and remarkably, the $c^{\mbox{(0)}}_{\rm p}[L^{\mbox{(0)}}]$ line is a dynamic attractor such that the unsteady dynamics of slip pulses (when they exist) -- whether growing ($\dot{L}(t)\!>\!0$) or decaying ($\dot{L}(t)\!<\!0$) -- reside on the steady-state line. The unsteady dynamics along the line are controlled by a single slow unstable mode. The slow dynamics of growing pulses, manifested by $\dot{L}(t)/c_{\rm p}(t)\!\ll\!1$, explain the existence of sustained pulses, i.e.~pulses that propagate many times their characteristic size without appreciably changing their properties. Our theoretical picture of unsteady frictional slip pulses is quantitatively supported by large-scale, dynamic boundary-integral method simulations.
description: Note an addition to v2: Literature results for the thermal pressurization constitutive relation are consistent with our findings and indicate the relevance of the emerging picture to strongly weakening frictional interfaces
Persistent-random-walk approach to anomalous transport of self-propelled particles
Creators: name: Sadjadi, Zeinab
name: Shaebani, M. Reza
name: Rieger, Heiko
name: Santen, Ludger
Publisher: name: arXiv
Year: 2015
Subjects: subject: Soft Condensed Matter (cond-mat.soft)
subject: Statistical Mechanics (cond-mat.stat-mech)
subject: FOS: Physical sciences

description: The motion of self-propelled particles is modeled as a persistent random walk. An analytical framework is developed that allows the derivation of exact expressions for the time evolution of arbitrary moments of the persistent walk's displacement. It is shown that the interplay of step length and turning angle distributions and self-propulsion produces various signs of anomalous diffusion at short time scales and asymptotically a normal diffusion behavior with a broad range of diffusion coefficients. The crossover from the anomalous short time behavior to the asymptotic diffusion regime is studied and the parameter dependencies of the crossover time are discussed. Higher moments of the displacement distribution are calculated and analytical expressions for the time evolution of the skewness and the kurtosis of the distribution are presented.
description: 15 pages, 13 figures
Designing reservist cells in time of crisis
Creators: name: REAL, Marion
name: Pierite, Jean-Luc
name: Quintero, Mariana
Publisher: name: Zenodo
Year: 2022
Subjects: designing for emergencies
scenario design
emergent futures
stakeholder mapping

description: Recent situations have illustrated the need for a more resilient population in times of crisis. In this workshop we introduce the concept of Reservist cells as a network of stakeholders ready to act when emergencies are declared and we invite the audience to envision together what would be the configurations of such networks through diverse emergency crises. As part of the Reservist project, the team of Fab Lab Barcelona will guide the participants to play with a customized version of the Atlas of Weak Signals tool. This short online workshop will be a co-creation playground for designers who want to explore emergent futures and debate on new forms of design research that can foster glocal resilience.
Wissenschaft und Erklärungspluralismus im Epikureismus
Creators: name: Jürss, Fritz
Publisher: name: Technische Universität Berlin
Year: 1994
Subjects: subject: 930 Geschichte des Altertums bis ca. 499, Archäologie
subject: 870 Italische Literaturen; Lateinische Literatur
subject: Epikureismus
subject: Erklärungspluralisums

description: Dieser Beitrag ist mit Zustimmung des Rechteinhabers aufgrund einer (DFG geförderten) Allianz- bzw. Nationallizenz frei zugänglich.
description: This publication is with permission of the rights owner freely accessible due to an Alliance licence and a national licence (funded by the DFG, German Research Foundation) respectively.
description: Erklärungspluralismus generell ist eine normale Erscheinung in der Geschichte der Erforschung der Wirklichkeit und gehört damit zum Bereich der Wissenschaft und ihrer Entwicklung. Wissenschaft als ein stets bewegtes System zeigt an ihrer Grenze zum Unbekannten eine Menge offener Probleme, die sich beim je aktuellen Erkenntnisstand eben der Erklärung durch eine ,una et vera causa' entziehen. Solange aber die zureichenden Bedingungen nicht gegeben sind, die eine wirkliche Ursache zu verifizieren, wird versucht, das Unmögliche zu falsifizieren, wobei dann alles Nichtfalsifizierte in Gestalt mehrerer Möglichkeiten bleibt. Dabei werden diese vorläufigen Möglichkeiten sukzessive durch Falsifikation weiter reduziert, bis eine einzige übrigbleibt, die dann als verifiziert und damit als notwendig oder auch als nur nicht falsifiziert (Popper) gilt. Dieser Erklärungspluralismus mit seiner Urteilssuspension ist also im Prinzip nur eine temporäre Erscheinung.
Stragglers of the thick disc
Creators: name: Cerqui, Valeria
name: Haywood, Misha
name: Di Matteo, Paola
name: Katz, David
name: Royer, Frédéric
Publisher: name: arXiv
Year: 2023
Subjects: subject: Astrophysics of Galaxies (astro-ph.GA)
subject: Solar and Stellar Astrophysics (astro-ph.SR)
subject: FOS: Physical sciences

description: Young alpha-rich (YAR) stars have been detected in the past as outliers to the local age $\rm-$ [$α$/Fe] relation. These objects are enhanced in $α$-elements but apparently younger than typical thick disc stars. We study the global kinematics and chemical properties of YAR giant stars in APOGEE DR17 survey and show that they have properties similar to those of the standard thick disc stellar population. This leads us to conclude that YAR are rejuvenated thick disc objects, most probably evolved blue stragglers. This is confirmed by their position in the Hertzsprung-Russel diagram (HRD). Extending our selection to dwarfs allows us to obtain the first general straggler distribution in an HRD of field stars. We also compare the elemental abundances of our sample with those of standard thick disc stars, and find that our YAR stars are shifted in oxygen, magnesium, sodium, and the slow neutron-capture element cerium. Although we detect no sign of binarity for most objects, the enhancement in cerium may be the signature of a mass transfer from an asymptotic giant branch companion. The most massive YAR stars suggest that mass transfer from an evolved star may not be the only formation pathway, and that other scenarios, such as collision or coalescence should be considered.
description: 18 Pages, 20 Figures, 1 Table; accepted for publication in Astronomy & Astrophysics
Resolving Ionisation and Metallicity on Parsec Scales Across Mrk 71 with HST-WFC3
Creators: name: James, Bethan L.
name: Auger, Matthew
name: Aloisi, Alessandra
name: Calzetti, Daniela
name: Kewley, Lisa
Publisher: name: arXiv
Year: 2015
Subjects: subject: Astrophysics of Galaxies (astro-ph.GA)
subject: FOS: Physical sciences

description: Blue Compact Dwarf (BCD) Galaxies in the nearby Universe provide a means for studying feedback mechanisms and star-formation processes in low-metallicity environments in great detail. Due to their vicinity, these local analogues to young galaxies are well suited for high-resolution studies that would be unfeasible for primordial galaxies in the high-redshift universe. Here we present HST-WFC3 observations of one such BCD, Mrk 71, one of the most powerful local starbursts known, in the light of [O II], He II, Hb, [O III], Ha, and [S II]. At D=3.44 Mpc, this extensive suite of emission line images enables us to explore the chemical and physical conditions of Mrk 71 on ~2 pc scales. Using these high spatial-resolution observations, we use emission line diagnostics to distinguish ionisation mechanisms on a pixel-by-pixel basis and show that despite the previously reported hypersonic gas and super-bubble blow out, the gas in Mrk 71 is photoionised, with no sign of shock-excited emission. Using strong-line metallicity diagnostics, we present the first 'metallicity image' of a galaxy, revealing chemically inhomogeneity on scales of <50 pc. We additionally demonstrate that while chemical structure can be lost at large spatial scales, metallicity-diagnostics can break down on spatial scales smaller than a HII region. HeII emission line images are used to identify up to six Wolf-Rayet stars in Mrk 71, three of which lie on the edge of blow-out region. This study not only demonstrates the benefits of high-resolution spatially-resolved observations in assessing the effects of feedback mechanisms, but also the limitations of fine spatial scales when employing emission-line diagnostics. Both aspects are especially relevant as we enter the era of extremely large telescopes, when observing structure on ~10 pc scales will no longer be limited to the local universe.
description: 20 pages, 14 figures, accepted for publication in ApJ
Mössbauer Studies of Nickel-Iron Hydrotalcites
Creators: name: Pegelow, U.
name: Winterer, M.
name: Mosel, B. D.
name: Schmalz, M.
name: Schöllhorn, R.
Publisher: name: Technische Universität Berlin
Year: 1994
Subjects: subject: 530 Physik
subject: Mössbauer spectroscopy
subject: nickel-iron hydrotalcite
subject: Fe(III) high spin
subject: collective cluster excitations

description: Hydrotalcite-like Fe-Ni-hydroxides [Ni2/3IIFe1/3III(OH)2](CO3)1/6(H2O)y , [Ni3/4IIFe1/4III(OH)2]-(CO3)1/8(H2O)y and [Ni3/4II/IIIFe1/4III(OH)2](CO3)0.14(H20)y as well as the ternary oxide NaNi2/3Fe1/3O2 have been studied by 57Fe-Mössbauer spectroscopy. All samples contain Fe3+ in a high spin state. The quadrupole interaction is smaller if a magnetic splitting is present, which may indicate a non-parallel arrangement of the principal axis of the EFG and the hyperfine field. The temperature dependence of the spectra has been understood in terms of collective cluster excitations. In this model the magnetic energy of a single domain depends on the direction of the total magnetic moment and on magnetic interaction with the neighbourhood. The spectral lineshape could be fitted assum­ing uniaxial relaxation.
PIPELINE POLITICS:  THE IMPACT OF NORD STREAM 2 ON EUROPEAN ENERGY SECURITY
Creators: name: Herrin, Andrew
Publisher: name: The University of North Carolina at Chapel Hill University Libraries
Year: 2019

description: The recently salient issue of energy security is again a contentious policy area in the EU with the construction of the Nord Stream 2 pipeline. Although energy security has been discussed in common EU energy policy, policy prescriptions to guarantee energy security remain fragmented between the Commission’s largely technocratic instruments and member states crafting of national policy. While core member states favor securing gas supply though pipelines via the Baltic Sea, CEE member states oppose infrastructure that may put them at risk if supply shocks occur. This thesis conceptualizes energy security, discusses contemporary EU energy policy, key actors, and divisions over how to achieve energy security. Furthermore, the thesis presents Nord Stream 2 in the context of energy security, discusses its supporters and opponents, assesses the pipeline within the Four As approach, concluding that it undermines EU energy security and is an example of the primacy of German energy policy over common EU policy.
Binuclear Manganese(III) Complexes as Electron Donors in D1/D2/Cytochrome b559 Preparations Isolated from Spinach Photosystem II Membrane Fragments
Creators: name: Allakhverdiev, S. I.
name: Karacan, M. S.
name: Somer, G.
name: Karacan, N.
name: Khan, E. M.
name: Rane, S. Y.
name: Padhye, S.
name: Klimov, V. V.
name: Renger, G.
Publisher: name: Technische Universität Berlin
Year: 1994
Subjects: subject: 570 Biowissenschaften; Biologie
subject: PS II reaction center
subject: manganese
subject: pheophytin photoaccumulation
subject: NADP+ reduction

description: The capability of different manganese complexes to act as PS II electron donors in D1/D2/ cytochrome b 559 complexes has been analyzed by measuring actinic light-induced absorption changes at 680 nm (650 nm) and 340 nm, reflecting the photoaccumulation of Pheophytin- (Pheo-) and the reduction of NADP+ respectively. The data obtained reveal: a) the donor capacity of synthetic binuclear Mn(III)2 complexes containing aromatic ligands significantly exceeds that for MnCl2 in both cases, i.e. Pheo- photoaccumulation and NADP+ reduction; b) manganese complexes can serve as suitable electron donors for light-induced NADP+ reduction catalyzed by D1/D2/cytochrome b559 complexes and ferredoxin plus ferredoxin- NADP+ reductase under anaerobic conditions and c) the specific turnover rate of the system leading to NADP+ reduction is extremely small. The implications of these findings are briefly discussed.
The origin of the planetary nebula M 1-16. A morphokinematic and chemical analysis
Creators: name: Gómez-Muñoz, M. A.
name: Vázquez, R.
name: Sabin, L.
name: Olguín, L.
name: Guillén, P. F.
name: Zavala, S.
name: Michel, R.
Publisher: name: arXiv
Year: 2023
Subjects: subject: Solar and Stellar Astrophysics (astro-ph.SR)
subject: Astrophysics of Galaxies (astro-ph.GA)
subject: FOS: Physical sciences

description: We investigated the origin of the Planetary Nebula (PN) M 1-16 using narrow-band optical imaging, and high- and low-resolution optical spectra to perform a detailed morpho-kinematic and chemical studies. M 1-16 is revealed to be a multipolar PN that predominantly emits in [O III] in the inner part of the nebula and [N II] in the lobes. A novel spectral unsharp masking technique was applied to the position-velocity (PV) maps to reveal a set of multiple structures at the centre of M 1-16 spanning radial velocities from $-$40km$\,$s$^{-1}$ to 20km$\,$s$^{-1}$, with respect to the systemic velocity. The morpho-kinematic model indicates that the deprojected velocity of the lobe outflows are $\geq$100km$\,$s$^{-1}$, and particularly the larger lobes and knots have a deprojected velocity of $\simeq$350km$\,$s$^{-1}$; the inner ellipsoidal component has a deprojected velocity of $\simeq$29km$\,$s$^{-1}$. A kinematical age of $\sim$8700yr has been obtained from the model assuming a homologous velocity expansion law and a distance of 6.2$\pm$1.9kpc. The chemical analysis indicates that M 1-16 is a Type I PN with a central star of PN (CSPN) mass in the range of $\simeq$0.618-0.713M$_\odot$ and an initial mass for the progenitor star between 2.0 and 3.0M$_\odot$ (depending on metallicity). An $T_\mathrm{eff}\simeq$140$\,$000K and log$(L/L_{\odot})$=2.3 was estimated using the 3MdB photoionisation models to reproduce the ionisation stage of the PN. All of these results have led us to suggest that M 1-16 is an evolved PN, contrary to the scenario of proto-PN suggested in previous studies. We propose that the mechanism responsible for the morphology of M 1-16 is related to the binary (or multiple star) evolution scenario.
description: A&A in press. 11 pages, 9 figures
Influence of network topology on cooperative problem-solving systems
Creators: name: Fontanari, José F.
name: Rodrigues, Francisco A.
Publisher: name: arXiv
Year: 2015
Subjects: subject: Social and Information Networks (cs.SI)
subject: Adaptation and Self-Organizing Systems (nlin.AO)
subject: Physics and Society (physics.soc-ph)
subject: FOS: Computer and information sciences
subject: FOS: Physical sciences

description: The idea of a collective intelligence behind the complex natural structures built by organisms suggests that the organization of social networks is selected so as to optimize problem-solving competence at the group-level. Here we study the influence of the social network topology on the performance of a group of agents whose task is to locate the global maxima of NK fitness landscapes. Agents cooperate by broadcasting messages informing on their fitness and use this information to imitate the fittest agent in their influence networks. In the case those messages convey accurate information on the proximity of the solution (i.e., for smooth fitness landscapes) we find that high connectivity as well as centralization boost the group performance. For rugged landscapes, however, these characteristics are beneficial for small groups only. For large groups, it is advantageous to slow down the information transmission through the network to avoid local maximum traps. Long-range links and modularity have marginal effects on the performance of the group, except for a very narrow region of the model parameters.
The Role of Civil Society in Competitive Authoritarian Legitimation Strategies: An Analysis of Venezuela and Bolivia
Creators: name: Reaves, Ashley
Publisher: name: The University of North Carolina at Chapel Hill University Libraries
Year: 2018

description: An increasing amount of research analyzes the ways that various forms of hybrid regimes maintain stability in the face of regular elections and other domestic and international pressures. Within this literature, scholars emphasize three primary pillars of stability: repression, co-optation, and legitimation. While a significant amount of recent work has examined the role of repression and co-optation, legitimation has been largely put aside. Yet, scholars recognize the importance of legitimacy for regime stability. My research aims to contribute to our understanding of this third pillar through a qualitative analysis of the role of civil society in competitive authoritarian legitimation strategies. I focus on two recent cases in Latin America: Venezuela under Hugo Chávez and Bolivia under Evo Morales.
Geneva College
Creators: name: Lieberman, Marya
name: Hall, Bonnie
name: McDonnell, Claire
name: Zea, Corbin
name: brown, Corina
name: Wilson, Erin
name: Muna, Grace
name: Taylor, Jason
name: Robinson, Jill
name: Esson, Joan
name: Easter, Joyce
name: Grochowski, Laura
name: Salazar, Laura
name: Mielke, Levi
name: Berta, Margaret
name: St. Clair, Martin
name: Turner, Mary
name: Howard, Maury
name: Doolittle, Pamela
name: Behan, Patrice
name: Austin, Rodney
name: Sinville, Rondedrick
name: Georgiadis, Rosina
name: Speidel, Rusty
name: Bliese, Sarah
name: Shaner, Sarah
name: Mang, Stephen
name: Barstis, Toni
name: Lockwood, Tracy-Lynn
name: Williams, Ursula
name: Loman, Jacob
name: Huschka, Ryan
name: Fletcher, Heidi
name: Khalafi, Lida
name: Knust, Kyle
name: Styers-Barnett, David
name: Smith, Madeline
name: Ashenef, Ayenew
name: Hollis, Gary
name: Voelker, Adam
name: Sisk, Matthew
name: Oberhof, Nils
name: Puccio, Maria
name: Wilson, Robert
name: Wyllie, Graeme
name: O'Connor, Christine
name: Womick, Jordan
name: Pilarcik, Jacob
name: Knepper, Leah
Publisher: name: Open Science Framework
Year: 2022
Subjects: subject: PAD
subject: PADProject

description: Method development and validation for HPLC analysis of Levofloxacin
A Monte Carlo exploration of threefold base geometries for 4d F-theory vacua
Creators: name: Taylor, Washington
name: Wang, Yi-Nan
Publisher: name: arXiv
Year: 2015
Subjects: subject: High Energy Physics - Theory (hep-th)
subject: FOS: Physical sciences

description: We use Monte Carlo methods to explore the set of toric threefold bases that support elliptic Calabi-Yau fourfolds for F-theory compactifications to four dimensions, and study the distribution of geometrically non-Higgsable gauge groups, matter, and quiver structure. We estimate the number of distinct threefold bases in the connected set studied to be $\sim { 10^{48}}$. The distribution of bases peaks around $h^{1, 1}\sim 82$. All bases encountered after "thermalization" have some geometric non-Higgsable structure. We find that the number of non-Higgsable gauge group factors grows roughly linearly in $h^{1,1}$ of the threefold base. Typical bases have $\sim 6$ isolated gauge factors as well as several larger connected clusters of gauge factors with jointly charged matter. Approximately 76% of the bases sampled contain connected two-factor gauge group products of the form SU(3)$\times$SU(2), which may act as the non-Abelian part of the standard model gauge group. SU(3)$\times$SU(2) is the third most common connected two-factor product group, following SU(2)$\times$SU(2) and $G_2\times$SU(2), which arise more frequently.
description: 38 pages, 22 figures
Photosystem II: Thermodynamics and Kinetics of Electron Transport from QA- to QB(QB- ) and Deleterious Effects of Copper(II)
Creators: name: Renger, G.
name: Gleiter, H. M.
name: Haag, E.
name: Reifarth, F.
Publisher: name: Technische Universität Berlin
Year: 1993
Subjects: subject: 570 Biowissenschaften; Biologie
subject: Photosystem II
subject: QB-Site
subject: copper(II) effects
subject: fluorescence
subject: oxygen evolution

description: Studies on thermodynamics and kinetics of electron transfer from QA- to QB(QB-) were performed by monitoring laser flash induced changes of the relative fluorescence emission as a function of temperature (220 K < T < 310 K) in isolated thylakoids and PS II membrane fragments. In addition, effects of bivalent metal ions on PS II were investigated by measuring conventional fluorescence induction curves, oxygen evolution, manganese content and atrazine binding mostly in PS II membrane fragments. It was found: a) the normalized level of the fluorescence remaining 10 s after the actinic flash (Ft/F0) steeply increases at temperatures below -10 to - 20 °C, b) the fast phase of the transient fluorescence change becomes markedly retarded with decreasing temperatures, c) among different cations (Cu2+, Zn2+, Cd2+, Ni2+, Co2+) only Cu2+ exhibits marked effects in the concentration range below 100 μᴍ and d) Cu2+ decreases the normalized variable fluorescence, inhibits oxygen evolution and diminishes the affinity to atrazine binding without affecting the number of binding sites. The content of about four manganeses per functionally competent oxygen evolving complex is not changed by [Cu2+] < 70 μᴍ. Based on these findings it is concluded: i) a temperature dependent equilibrium between an inactive (I) and active (A) state of QA- reoxidation by QB(QB- ) is characterized by standard enthalpies ΔH° of 95 kJ mol-1 and 60 kJ mol-1 and standard entropies ΔS° of 370 kJ K-1 mol-1 and 240 kJ K-1 mol-1 in isolated thylakoids and PS II membrane fragments, respectively, ii) the activation energies of QA- reoxidation by plastoquinone bound to the QB site are about 30 kJ mol-1 (thylakoids) and 40 kJ mol-1 (PS II membrane fragments) in 220 K < T < 300 K, and iii) Cu2+ causes at least a two-fold effect on PS II by modifying the atrazine binding affinity at lower concentrations ( ~ 5 μᴍ) and interference with the redox active tyrosine Yz at slightly higher concentration ( ~ 10 μᴍ) leading to blockage of oxygen evolution.
Essener Gespräche zum Thema Staat und Kirche (30): Das christliche Freiheitsverstädnis in seiner Beduetung für die saatliche Rechtsordnung
Publisher: name: Herder Korrespondenz
Year: 1970

description: Herder Korrespondenz, Bd. 50 Nr. 10 (1996): Herder Korrespondenz, Band 50, Heft 10
On degree anti-Ramsey numbers
Creators: name: Gilboa, Shoni
name: Hefetz, Dan
Publisher: name: arXiv
Year: 2015
Subjects: subject: Combinatorics (math.CO)
subject: FOS: Mathematics

description: The degree anti-Ramsey number $AR_d(H)$ of a graph $H$ is the smallest integer $k$ for which there exists a graph $G$ with maximum degree at most $k$ such that any proper edge colouring of $G$ yields a rainbow copy of $H$. In this paper we prove a general upper bound on degree anti-Ramsey numbers, determine the precise value of the degree anti-Ramsey number of any forest, and prove an upper bound on the degree anti-Ramsey numbers of cycles of any length which is best possible up to a multiplicative factor of $2$. Our proofs involve a variety of tools, including a classical result of Bollobás concerning cross intersecting families and a topological version of Hall's Theorem due to Aharoni, Berger and Meshulam.
X-Ray Structural Analysis and Vibrational Spectra of Sodium Cysteine-S-sulfonate, +H3NCH(COO-)CH2S2O3Na • 3/2H2O [1]
Creators: name: Steudel, Ralf
name: Albertsen, Angela
name: Kustos, Monika
name: Pickardt, Joachim
Publisher: name: Technische Universität Berlin
Year: 1993
Subjects: subject: 540 Chemie und zugeordnete Wissenschaften
subject: cysteine
subject: S-Sulfonate
subject: structure
subject: spectra
subject: hydrogen bonds

description: The title compound crystallizes orthorhombically (space group C 2221) with a = 797.0, b = 870.3 and c = 2739.0 pm. The anions are zwitterions which are heavily involved in intra- and intermolecular NH •••O and OH•••O hydrogen bonding. The two types of sodium cations are coordinated by six oxygen atoms each of which belongs to either SO3 groups (Na 2) or water molecules and SO3 groups (Na1). A second type of water molecules is not coordinated to the cations. The SS bond length is 208.2 pm. Infrared and Raman spectra of the title compound are reported and tentatively assigned. The SS stretching vibration is observed at 409 cm-1.
Iterative Learning and Extremum Seeking for Repetitive Time-Varying Mappings
Creators: name: Cao, Zhixing
name: Dürr, Hans-Bernd
name: Ebenbauer, Christian
name: Allgöwer, Frank
name: Gao, Furong
Publisher: name: arXiv
Year: 2015
Subjects: subject: Optimization and Control (math.OC)
subject: FOS: Mathematics

description: In this paper, we develop an extremum seeking control method integrated with iterative learning control to track a time-varying optimizer within finite time. The behavior of the extremum seeking system is analyzed via an approximating system - the modified Lie bracket system. The modified Lie bracket system is essentially an online integral-type iterative learning control law. The paper contributes to two fields, namely, iterative learning control and extremum seeking. First, an online integral type iterative learning control with a forgetting factor is proposed. Its convergence is analyzed via $k$-dependent (iteration- dependent) contraction mapping in a Banach space equipped with $λ$-norm. Second, the iterative learning extremum seeking system can be regarded as an iterative learning control with "control input disturbance." The tracking error of its modified Lie bracket system can be shown uniformly bounded in terms of iterations by selecting a sufficiently large frequency. Furthermore, it is shown that the tracking error will finally converge to a set, which is a $λ$-norm ball. Its center is the same with the limit solution of its corresponding "disturbance-free" system (the iterative learning control law); and its radius can be controlled by the frequency.
description: 15 pages
Galactic ArchaeoLogIcaL ExcavatiOns (GALILEO) II. t-SNE Portrait of Local Fossil Relics and Structures
Creators: name: Ortigoza-Urdaneta, Mario
name: Vieira, Katherine
name: Fernández-Trincado, José G.
name: Queiroz, Anna. B. A.
name: Barbuy, Beatriz
name: Beers, Timothy C.
name: Chiappini, Cristina
name: Anders, Friedrich
name: Minniti, Dante
name: Tang, Baitian
Publisher: name: arXiv
Year: 2023
Subjects: subject: Astrophysics of Galaxies (astro-ph.GA)
subject: Solar and Stellar Astrophysics (astro-ph.SR)
subject: FOS: Physical sciences

description: Based on high-quality APOGEE DR17 and Gaia DR3 data for 1,742 red giants stars within 5 kpc of the Sun and not rotating with the Galactic disc ($V_ϕ<$ 100 km s$^{-1}$), we use the nonlinear technique of unsupervised analysis t-SNE to detect coherent structures in the space of ten chemical-abundance ratios: [Fe/H], [O/Fe], [Mg/Fe], [Si/Fe], [Ca/Fe], [C/Fe], [N/Fe], [Al/Fe], [Mn/Fe], and [Ni/Fe]. Additionally, we obtain orbital parameters for each star using the non-axisymmetric gravitational potential {\tt GravPot16}. Seven structures are detected, including the Splash, Gaia-Sausage-Enceladus (GSE), the high-$α$ heated-disc population, N-C-O peculiar stars, and inner disk-like stars, plus two other groups that did not match anything previously reported in the literature, here named Galileo 5 and Galileo 6 (G5 and G6). These two groups overlap with Splash in [Fe/H], G5 being lower metallicity than G6, both between GSE and Splash in the [Mg/Mn] versus [Al/Fe] plane, G5 in the $α$-rich in-situ locus, and G6 on the border of the $α$-poor in-situ one; nonetheless their low [Ni/Fe] hints to a possible ex-situ origin. Their orbital energy distributions are between the Splash and GSE, with G5 being slightly more energetic than G6. We verified the robustness of all the obtained groups by exploring a large range of t-SNE parameters, applying it to various subsets of data, and also measuring the effect of abundance errors through Monte Carlo tests.
description: Accepted by A&A. 19 pages, 15 figures, and 3 tables
Effect of Tentoxin on the Activation and on the Catalytic Reaction of Reconstituted H+-ATPase from Chloroplasts
Creators: name: Fromme, Petra
name: Dahse, Ingo
name: Gräber, Peter
Publisher: name: Technische Universität Berlin
Year: 1992
Subjects: subject: 570 Biowissenschaften; Biologie
subject: H+-ATPase
subject: CF0F1
subject: Tentoxin
subject: enzyme kinetics
subject: uni-site catalysis

description: The proton-translocating ATPase from chloroplasts, CF0F1, was isolated, purified and reconstituted into asolectin liposomes. The effect of the energy transfer inhibitor, tentoxin, on different functions of the enzyme was investigated. Tentoxin does not inhibit the nucleotide release during energization by a pH /ΔΨ jump, i.e. the activation of the enzyme is not influenced. ATP synthesis driven by a pH /ΔΨ jump and multi-site ATP hydrolysis are completely inhibited by tentoxin, whereas uni-site ATP hydrolysis is not influenced.
Why Choose Us?: Creating and Applying a Comprehensive Rubric of Expected and Recommended Website Elements to Compare and Analyze the Operational and Marketing Resources Offered on Public and Charter School Websites in Central North Carolina
Creators: name: OKUN, WILL
Publisher: name: The University of North Carolina at Chapel Hill University Libraries
Year: 2019

description: In the intensifying marketplace of American compulsory education, public school leaders are increasingly obligated to compete with charter schools and other schools of choice for the enrollment of students in their communities.  Facing this new challenge, school leaders are beginning to adapt marketing strategies and practices long used by leaders of universities, colleges and private schools to better communicate how their schools’ unique academics, programs, values, and outcomes best achieve the needs and wants of current and potential stakeholders.  This study examines the extent to which public school leaders, in comparison to charter school leaders, are using their school websites for these marketing purposes.  Toward this goal, the researcher synthesized existing literature on education marketing and school websites to establish a comprehensive rubric containing 69 elements that are recommended or expected to be offered on school websites for both operational and promotional purposes.  The subsequent application of this rubric to the websites of universities, private schools, charter schools, and public schools in a region of central North Carolina shows that, among other findings, public school leaders are comparably utilizing their school websites as operational hubs but not as marketing platforms, particularly in districts with above-average charter school enrollment.  In recommending that public school leaders be more purposeful and effective in using school websites as marketing mediums, this study, and the new comprehensive rubric itself, can serve as an initial guide for school leaders desiring to evaluate or improve the promotional, as well as the operational, capabilities of their school websites.
Static and Dynamic Properties of Ferroelectric Liquid Crystals in the Vicinity of a First-Order SmA-SmC* Phase Transition
Creators: name: Netz, Roland R.
name: Hess, Siegfried
Publisher: name: Technische Universität Berlin
Year: 1992
Subjects: subject: 530 Physik
subject: ferroelectric liquid crystals
subject: SmA-SmC* phase

description: A unified theoretical description of static and dynamic properties of ferroelectric liquid crystals in terms of a Landau free energy is presented. The shear deformation tensor is used as principal order parameter. Results for the stationary case for tilt angle variation and dielectric properties are compared with experiments on a compound with a pronounced first-order SmA-SmC* phase transition for various strengths of the applied electric field.
ExoMDN: Rapid characterization of exoplanet interior structures with Mixture Density Networks
Creators: name: Baumeister, Philipp
name: Tosi, Nicola
Publisher: name: arXiv
Year: 2023
Subjects: subject: Earth and Planetary Astrophysics (astro-ph.EP)
subject: Machine Learning (cs.LG)
subject: FOS: Physical sciences
subject: FOS: Computer and information sciences

description: Characterizing the interior structure of exoplanets is essential for understanding their diversity, formation, and evolution. As the interior of exoplanets is inaccessible to observations, an inverse problem must be solved, where numerical structure models need to conform to observable parameters such as mass and radius. This is a highly degenerate problem whose solution often relies on computationally-expensive and time-consuming inference methods such as Markov Chain Monte Carlo. We present ExoMDN, a machine-learning model for the interior characterization of exoplanets based on Mixture Density Networks (MDN). The model is trained on a large dataset of more than 5.6 million synthetic planets below 25 Earth masses consisting of an iron core, a silicate mantle, a water and high-pressure ice layer, and a H/He atmosphere. We employ log-ratio transformations to convert the interior structure data into a form that the MDN can easily handle. Given mass, radius, and equilibrium temperature, we show that ExoMDN can deliver a full posterior distribution of mass fractions and thicknesses of each planetary layer in under a second on a standard Intel i5 CPU. Observational uncertainties can be easily accounted for through repeated predictions from within the uncertainties. We use ExoMDN to characterize the interior of 22 confirmed exoplanets with mass and radius uncertainties below 10% and 5% respectively, including the well studied GJ 1214 b, GJ 486 b, and the TRAPPIST-1 planets. We discuss the inclusion of the fluid Love number $k_2$ as an additional (potential) observable, showing how it can significantly reduce the degeneracy of interior structures. Utilizing the fast predictions of ExoMDN, we show that measuring $k_2$ with an accuracy of 10% can constrain the thickness of core and mantle of an Earth analog to $\approx13\%$ of the true values.
description: 15 pages, 15 figures, accepted for publication in Astronomy & Astrophysics. The ExoMDN model is freely accessible at https://github.com/philippbaumeister/ExoMDN
Where are the BTZ Black Hole Degrees of Freedom? The Rotating Case
Creators: name: Mitchell, Joseph
Publisher: name: arXiv
Year: 2015
Subjects: subject: General Relativity and Quantum Cosmology (gr-qc)
subject: High Energy Physics - Theory (hep-th)
subject: FOS: Physical sciences

description: Recent work has shown that the entropy of the non-rotating BTZ black hole can be derived from a dual conformal description at any spatial location. In this followup it is shown that a dual conformal description exists at any spatial location for the rotating BTZ black hole as well. As in the non-rotating case, two copies of the central charge $c^{\pm} = 3\ell/2G$ are recovered and the microcanonical Cardy formula yields the correct Bekenstein-Hawking entropy.
description: 10 pages, 1 figure; fixed/added references
PRE-DOCTORAL EDUCATION IN CONE BEAM COMPUTED TOMOGRAPHY- A SURVEY OF NORTH AMERICA DENTAL SCHOOLS
Creators: name: Dadul, Tenzin
Publisher: name: The University of North Carolina at Chapel Hill University Libraries
Year: 2019

description: Pre-doctoral Education in Cone Beam Computed Tomography- A Survey of North American Dental Schools      Objectives: To determine the CBCT education status and the clock hours for CBCT instruction in North American Dental Schools.       Method: An electronic questionnaire was sent to seventy-six PICOMRIs using Qualtrics.  They were requested to send another questionnaire to fourth-year dental students.       Results: Fifty PICOMRIs (65.79%) responded to the survey. CBCT anatomy and interpretation were taught in all thirty-three and twenty-nine responding dental schools, respectively. There was a statistically significant difference between CBCT instruction and PICOMRIs’ education and experience (p<0.05). A moderate and strong association between CBCT instruction and PICOMRIs’ qualification and experience noted.  PICOMRIs (69.44%) believed students were a novice and not sure/no (77.14%) about sufficient CBCT knowledge/skill level to implement CBCT. Sixty percent CBCT instruction (1-2 hours) occurred outside the radiology department and seventy-four schools offered continuing education.       Conclusion: Data revealed inconsistencies in CBCT instruction and further research recommended establishing an adequate level CBCT knowledge level in North America.
Psychomteric properties of Slovak version of 16-item Self-Reported Quick Inventory of Depressive Symptomatology
Creators: name: Baník, Gabriel
Publisher: name: Open Science Framework
Year: 2022
Subjects: subject: Clinical Psychology
subject: Psychiatry and Psychology
subject: Medicine and Health Sciences
subject: Social and Behavioral Sciences
subject: Psychology
subject: FOS: Psychology
subject: confirmatory factor analysis
subject: depression
subject: measurement
subject: psychometric proporties
subject: QIDS-16-SR

description: In this project will be tested selected psychometric properties of the Slovak version of the Quick Depression Inventory - 16-SR.
An exploration of parents’ perceptions participating in an intervention for toddlers with autism spectrum disorder
Creators: name: Amsbary, Jessica Anne
Publisher: name: The University of North Carolina at Chapel Hill University Libraries
Year: 2019

description: Early intervention services are intended to be family-centered, meaning families are honored, respected, and involved in service delivery (Dunst, 2002). However, little research has been conducted to explore family perceptions of their participation in early intervention services. This study explored 12 families’ perceptions about their experiences in an early intervention designed for toddlers with autism spectrum disorder (ASD).      One framework through which to examine parent perceptions of interventions is implementation science. The Formula for Success in implementation science posits: (a) innovations, or intervention components, such as goals, strategies, and materials; (b) implementation processes such as coaching and using intervention strategies; and (c) contextual factors such as when, where, and how long the intervention is delivered work together in leading to optimal outcomes (National Implementation Research Network; NIRN, Blasé & Fixsen, 2013). As a result, obtaining parent perceptions focused on these constructs could provide information regarding whether early interventions are meeting families’ needs and priorities.       Twelve interviews were conducted with parents who participated in an early intervention designed for toddlers with ASD. Data were systematically coded using an exploratory approach to develop themes and subthemes. The results indicated parents perceived participation in the intervention as a positive experience, but shared a few challenges and suggestions to improve their experiences. Parents found intervention components to be particularly helpful such as paper copies of homework, visuals, and countdowns. They suggested intervention components that would have enhanced their experiences such as individualized exit summaries and online resources. Parents reported mixed levels of involvement in goal development processes. Parents found implementation processes such as watching models and receiving feedback as helpful. They developed strong relationships with their interventionists, positively impacting their implementation experiences. Parents reported mixed levels of comfort practicing strategies and mixed levels of success applying strategies to daily routines. Parents found contextual factors to be helpful such as service delivery in home and clinic settings. They reported contextual challenges such as scheduling sessions and the intervention’s limited duration.        	      The findings suggest the need for individualized early intervention services focused on families’ unique structures, dynamics, priorities and strengths. Practice and research implications are discussed.
Studies on Herbicide Binding in Photosystem II Membrane Fragments from Spinach
Creators: name: Fromme, R.
name: Renger, G.
Publisher: name: Technische Universität Berlin
Year: 1990
Subjects: subject: 570 Biowissenschaften; Biologie
subject: atrazine binding
subject: Photosystem II
subject: Ca2+ effects
subject: temperature dependence
subject: mild proteolysis

description: The mechanism of atrazine binding and its modification by Chelex-100-induced Ca2+ depletion and proteolytic degradation by trypsin, was analyzed in PS II membrane fragments from spinach. It was found: 1) Chelex-100 treatment leads in a comparatively slow process (t1/2 = 5 - 10 min) to Ca2+ re moval from a site that is characterized by a high affinity as reflected by KD values of the order of 10-7M. The number of these binding sites was found to be almost one per PS II in samples washed twice with Ca2+ -free buffer. 2) Chelex-100 treatment does not affect the affinity of atrazine binding but increases the susceptibility to proteolytic attack by trypsin. 3) The electron transport activity is only slightly affected by Chelex-100 treatment. 4) The atrazine binding exhibits a rather small T-dependence within the physiological range of 7 °C to 27 °C. The implications of these findings for herbicide binding are discussed.