cometadata/datacite-rtg-text-other-reclassification-records huggingface dataset:
Beta-conjugates of real algebraic numbers as Puiseux expansions
Creators: name: Verger-Gaugry, Jean-Louis
Publisher: name: arXiv
Year: 2011
Subjects: subject: Number Theory (math.NT)
subject: FOS: Mathematics

description: The beta-conjugates of a base of numeration $β> 1$, $β$ being a Parry number, were introduced by Boyd, in the context of the Rényi-Parry dynamics of numeration system and the beta-transformation. These beta-conjugates are canonically associated with $β$. Let $β> 1$ be a real algebraic number. A more general definition of the beta-conjugates of $β$ is introduced in terms of the Parry Upper function $f_β(z)$ of the beta-transformation. We introduce the concept of a germ of curve at $(0,1/β) \in \mathbb{C}^{2}$ associated with $f_β(z)$ and the reciprocal of the minimal polynomial of $β$. This germ is decomposed into irreducible elements according to the theory of Puiseux, gathered into conjugacy classes. The beta-conjugates of $β$, in terms of the Puiseux expansions, are given a new equivalent definition in this new context. If $β$ is a Parry number the (Artin-Mazur) dynamical zeta function $ζ_β(z)$ of the beta-transformation, simply related to $f_β(z)$, is expressed as a product formula, under some assumptions, a sort of analog to the Euler product of the Riemann zeta function, and the factorization of the Parry polynomial of $β$ is deduced from the germ.
The pasta phase and its consequences on neutrino opacities
Creators: name: Alloy, M. D.
name: Menezes, D. P.
Publisher: name: arXiv
Year: 2010
Subjects: subject: Nuclear Theory (nucl-th)
subject: High Energy Astrophysical Phenomena (astro-ph.HE)
subject: FOS: Physical sciences

description: In this paper, we calculate the diffusion coefficients that are related to the neutrino opacities considering the formation of nuclear pasta and homogeneous matter at low densities. Our results show that the mean free paths are significantly altered by the presence of nuclear pasta in stellar matter when compared with the results obtained with homogeneous matter. These differences in neutrino opacities certainly influence the Kelvin-Helmholtz phase of protoneutron stars and consequently the results of supernova explosion simulations.
Complexes Containing Phosphorus and Arsenic as Terminal Ligands [Komplexe mit Phosphor und Arsen als terminalen Liganden}
Creators: name: Scheer, Manfred
name: Müller, Jan
name: Häser, Marco
Publisher: name: Universität Regensburg
Year: 1996
Subjects: subject: arsenido complexes; complexes with elements of group 15; phosphido complexes; tungsten compounds
subject: 540 Chemie

description: Complexes with terminal pnictide ligands are interesting in themselves and as ligands for the complexation of Lewis acids. Herein the syntheses of complexes such as 1 (E P, As) and 2 (M Cr, W) are described, and detailed theoretical studies on the relative thermodynamic stability of these and analogously constructed complexes are presented.
Stratospheric Hydration Processes in Tropopause-Overshooting Convection Revealed by Tracer-Tracer Correlations From the DCOTSS Field Campaign
Creators: name: Homeyer, Cameron R.
name: Gordon, Andrea E.
name: Smith, Jessica B.
name: Ueyama, Rei
name: Wilmouth, David M.
name: Sayres, David S.
name: Hare, Jennifer
name: Pandey, Apoorva
name: Hanisco, Thomas F.
name: Dean-Day, Jonathan M.
name: Hannun, Reem
name: St. Clair, Jason
Publisher: name: AGU
Year: 2024

description: Hydration of the stratosphere by tropopause-overshooting convection has received increasing interest due to the extreme concentrations of water vapor that can result and, ultimately, the climate warming potential such hydration provides. Previous work has recognized the importance of numerous dynamic and physical processes that control stratospheric water vapor delivery by convection. This study leverages recent comprehensive observations from the NASA Dynamics and Chemistry of the Summer Stratosphere (DCOTSS) field campaign to determine the frequency at which each process operates during real events. Specifically, a well-established analysis technique known as tracer-tracer correlation is applied to DCOTSS observations of ozone, water vapor, and potential temperature to identify the occurrence of known processes. It is found that approximately half of convectively-driven stratospheric hydration samples show no indication of significant air mass transport and mixing, emphasizing the importance of ice sublimation to stratospheric water vapor delivery. Furthermore, the temperature of the upper troposphere and lower stratosphere environment and/or overshoot appears to be a commonly active constraint, since the approximate maximum possible water vapor concentration that can be reached in an air mass is limited to the saturation mixing ratio when ice is present. Finally, little evidence of relationships between dynamic and physical processes and their spatial distribution was found, implying that stratospheric water vapor delivery by convection is likely facilitated by a complex collection of processes in each overshooting event.
Probing Bidirectional Plasmon-Plasmon Coupling-Induced Hot Charge Carriers in Dual Plasmonic Au/CuS Nanocrystals
Creators: name: Bessel, Patrick
name: Niebur, André
name: Kranz, Daniel
name: Lauth, Jannika
name: Dorfs, Dirk
Publisher: name: Weinheim : Wiley-VCH Verl.
Year: 2023
Subjects: subject: hot charge carrier relaxation
subject: localized surface plasmon resonance
subject: localized surface plasmon resonance (LSPR)
subject: transient absorption spectroscopy
subject: ultrafast dynamics
subject: 620

description: Heterostructured Au/CuS nanocrystals (NCs) exhibit localized surface plasmon resonance (LSPR) centered at two different wavelengths (551 and 1051 nm) with a slight broadening compared to respective homostructured Au and CuS NC spectra. By applying ultrafast transient absorption spectroscopy we show that a resonant excitation at the respective LSPR maxima of the heterostructured Au/CuS NCs leads to the characteristic hot charge carrier relaxation associated with both LSPRs in both cases. A comparison of the dual plasmonic heterostructure with a colloidal mixture of homostructured Au and CuS NCs shows that the coupled dual plasmonic interaction is only active in the heterostructured Au/CuS NCs. By investigating the charge carrier dynamics of the process, we find that the observed interaction is faster than phononic or thermal processes (< 100 fs). The relaxation of the generated hot charge carriers is faster for heterostructured nanocrystals and indicates that the interaction occurs as an energy transfer (we propose Landau damping or interaction via LSPR beat oscillations as possible mechanisms) or charge carrier transfer between both materials. Our results strengthen the understanding of multiplasmonic interactions in heterostructured Au/CuS NCs and will significantly advance applications where these interactions are essential, such as catalytic reactions.
Different Ways of P4 Transformation in the Coordination Sphere of Transition Metals
Creators: name: Scheer, Manfred
name: Schuster, Kay
name: Becker, Uta
Publisher: name: Universität Regensburg
Year: 1996
Subjects: subject: 540 Chemie

description: The transformation pathway of tetrahedral P4 to the corresponding Pn ligands has been studied by the three-component-reaction are found to depend on the electron number of the complex fragments used. In the case of complexes forming fragments with an even number of valence electrons, a stepwise P-P bond cleavage is observed with a bicyclotetraphosphine intermediate to give a cyclo-P4 containing product. Complexes with an odd number of valence electrons cause a P1/P3 fragmentation. A possible product of this reaction is a phosphido complex of the type [LnM≡P→M'(CO)5] (M' = Cr, W), which is self-stabilised by dimerisation. The phosphido complex [(tBuO)3W≡P→M(CO)5] (M = Cr, W) is formed via the reaction of W2(OtBu)6 with RC≡P in the presence of the Lewis acids [M(CO)5THF].
The atmospheres of the hot-Jupiters Kepler-5b and Kepler-6b observed during occultations with Warm-Spitzer and Kepler
Creators: name: Desert, Jean-Michel
name: Charbonneau, David
name: Fortney, Jonathan J.
name: Madhusudhan, Nikku
name: Knutson, Heather A.
name: Fressin, Francois
name: Deming, Drake
name: Borucki, William J.
name: Brown, Timothy M.
name: Caldwell, Douglas
name: Ford, Eric B.
name: Gilliland, Ronald L.
name: Latham, David W.
name: Marcy, Geoffrey W.
name: Seager, Sara
name: Team, the Kepler Science
Publisher: name: arXiv
Year: 2011
Subjects: subject: Earth and Planetary Astrophysics (astro-ph.EP)
subject: FOS: Physical sciences

description: This paper reports the detection and the measurements of occultations of the two transiting hot giant exoplanets Kepler-5b and Kepler-6b by their parent stars. The observations are obtained in the near infrared with Spitzer Space Telescope and at optical wavelengths by combining more than a year of Kepler photometry. The investigation consists of constraining the eccentricities of these systems and of obtaining broad band emergent spectra for individual planets. For both targets, the occultations are detected at 3 sigma level at each wavelength with mid-occultation times consistent with circular orbits. The brightness temperatures of these planets are deduced from the infrared observations and reach T=1930+/-100K and T=1660+/-120K for Kepler-5b and Kepler-6b respectively. We measure optical geometric albedos A_g in the Kepler bandpass and find A_g=0.12+/-0.04 for Kepler-5b and A_g=0.11+/-0.04 for Kepler-6b leading to an upper limit for the Bond albedo of A_B < 0.17 in both cases. The observations for both planets are best described by models for which most of the incident energy is redistributed on the dayside, with only less than 10% of the absorbed stellar flux redistributed to the night side of these planets. The data for Kepler-5b favor a model without a temperature inversion, whereas for Kepler-6b they do not allow distinguishing between models with and without inversion.
description: 26 pages, 18 figures, 3 tables, submitted to ApJ
Multiple field-of-view MCAO for a Large Solar Telescope: LOST simulations
Creators: name: Stangalini, Marco
name: Berrilli, Francesco
name: Del Moro, Dario
name: Piazzesi, Roberto
Publisher: name: arXiv
Year: 2010
Subjects: subject: Instrumentation and Methods for Astrophysics (astro-ph.IM)
subject: FOS: Physical sciences

description: In the framework of a 4m class Solar Telescope we studied the performance of the MCAO using the LOST simulation package. In particular, in this work we focus on two different methods to reduce the time delay error which is particularly critical in solar adaptive optics: a) the optimization of the wavefront reconstruction by reordering the modal base on the basis of the Mutual Information and b) the possibility of forecasting the wavefront correction through different approaches. We evaluate these techniques underlining pros and cons of their usage in different control conditions by analyzing the results of the simulations and make some preliminary tests on real data.
description: 10 pages, 5 figures to be published in Adaptive Optics Systems II (Proceedings Volume) Proceedings of SPIE
Hadronic Rapidity Spectra in Heavy Ion Collisions at SPS and AGS energies in a Quark Combination Model
Creators: name: Sun, Le-xue
name: Wang, Rui-qin
name: Song, Jun
name: Shao, Feng-lan
Publisher: name: arXiv
Year: 2011
Subjects: subject: High Energy Physics - Phenomenology (hep-ph)
subject: FOS: Physical sciences

description: The quark combination mechanism of hadron production is applied to nucleus-nucleus collisions at the CERN Super Proton Synchrotron (SPS) and BNL Alternating Gradient Synchrotron (AGS). The rapidity spectra of identified hadrons and their spectrum widths are studied. The data of $π^{-}$, $K^{\pm}$, $ϕ$, $Λ$, $\barΛ$, $Ξ^{-}$, and $\barΞ^{+}$ at 80 and 40 AGeV, in particular at 30 and 20 AGeV where the onset of deconfinement is suggested to happen, are consistently described by the quark combination model. However at AGS 11.6 AGeV below the onset the spectra of $π^{\pm}$, $K^{\pm}$ and $Λ$ can not be simultaneously explained, indicating the disappearance of intrinsic correlation of their production in the constituent quark level. The collision-energy dependence of the rapidity spectrum widths of constituent quarks and the strangeness of the hot and dense quark matter produced in heavy ion collisions are obtained and discussed.
description: 7 pages, 5 figures
The targum (1878:Dec.)
Creators: name: No Name Supplied
Publisher: name: Targum Association
Year: 1878

description: Some University historians indicate that the Targum was first published as an annual in 1867, but of this we have no extant evidence. In January 1869, the Targum as we now know it, made its appearance as a monthly paper that concerned itself with student “literary contributions” and college news as well as serving as a vehicle for bringing news to alumni and the general public. The newspaper, which originally was for sale, varied in frequency over the years as did its title (The Targum, Rutgers Targum, Rutgers Daily Targum, and Daily Targum). The newspaper has continuously been published since 1869 with the exception of 19 months during the second world war, between February 1944 and October 1945. The Targum was published by the students of Rutgers College, and later Rutgers University—New Brunswick represented through the years as the Targum Association, Rutgers Targum Association, and Rutgers College Targum. As a student organization, the Targum operated under the oversight of the dean of students and student government but in October 1980, the Targum became an independent college paper.
Grayscale ultrasonography findings for characterization of gallbladder wall thickening in non-acute setting: a systematic review and meta-analysis
Creators: name: Rana, Pratyaksha
name: Gupta, Pankaj
name: Kalage, Daneshwari
name: Soundararajan, Raghuraman
name: Kumar-M, Praveen
name: Dutta, Usha
Publisher: name: Taylor & Francis
Year: 2022
Subjects: subject: Cell Biology
subject: Genetics
subject: FOS: Biological sciences
subject: Biotechnology
subject: Sociology
subject: FOS: Sociology
subject: Cancer
subject: Plant Biology

description: The accurate characterization of gallbladder wall thickening (GWT) into benign or malignant on ultrasound (US) is a significant challenge. We searched the MEDLINE and EMBASE databases for studies reporting two-dimensional grayscale US in benign and malignant GWT. The pooled prevalence was calculated using a generalized linear mixed method with a random-effects model. The pooled sensitivity and specificity were calculated using a bivariate random-effects model. Of the 7309 studies screened by titles, 73 studies with 18,008 patients were included. The most common findings in xanthogranulomatous cholecystitis (XGC) were lack of wall disruption and intramural hypoechoic nodules while adenomyomatosis (ADM) was frequently associated with intramural cysts and intramural echogenic foci. Echogenic foci, lack of gallbladder wall disruption, and hypoechoic nodules had a sensitivity of 89%, 77%, and 66% and specificity of 86%, 51%, and 80%, respectively for the diagnosis of benign GWT. Focal thickening and indistinct liver interface had a sensitivity of 75% and 55% and specificity of 64% and 69%, respectively for the diagnosis of malignant GWT. intramural features (echogenic foci, hypoechoic nodules), gallbladder wall disruption, and liver interface are useful US features for the characterization of GWT.
Complexes with a Metal Phosphorus Triple Bond
Creators: name: Scheer, Manfred
name: Kramkowski, Peter
name: Schiffer, Michael
name: Müller, Jan
Publisher: name: Universität Regensburg
Year: 1999
Subjects: subject: phosphido ligands; alkoxide complexes; metal-phosphorus-multiple bond
subject: 540 Chemie

description: Herein we report the synthesis of different phosphido-complexes and -intermediates with WLE-triple bond. These compounds reveal different reactivity patterns. Details of reactivity as well as spectroscopic and theoretical aspects will be discussed in detail.
A study of the photochemical reaction between W2(OCH2tBu)6 and P4. Characterization of the phosphido cluster W4(P)2(OCH2tBu)10
Creators: name: Chisholm, Malcolm H.
name: Folting, Kristen
name: Scheer, Manfred
Publisher: name: Universität Regensburg
Year: 1998
Subjects: subject: tungsten; alkoxide; phosphide; cluster
subject: 540 Chemie

description: The photochemical reaction between W2(OCH2tBu)6 and P4 has been studied by NMR spectroscopy in toluene-d8 and those reactions have been complemented by studies on the bench top. A complex sequence of reactions is implicated by the formation of a variety of products, one of which has been observed previously in the thermal reaction between W2(OCH2tBu)6L2 where L = py and HNMe2 and P4, namely W3(μ3-P)(OCH2tBu)9, while others must arise from degradation of OR ligands. A new compound W4(μ3-P)2(μ-OCH2tBu)4 (OCH2tBu)6 has been isolated and characterized. Crystal data at −165°C: a = 19.955(4), b = 25.222(3), c = 12.775(2) Å, Z = 4 and space group Pcab. The centrosymmetric structure consists of a distorted rhombus of metal atoms having two different W--W edge distances 2.6938(8) and 2.7981(8) Å and a bonding W--W distance of 2.692(1) Å between the back-bone W atoms of the planar W4 butterfly. The outer or wing-tip tungsten atoms are in a square based pyramidal environment with respect to the PWO4 moiety with the W--P bond in the apical position. The O4 basal plane involves two terminal and two bridging OR groups. The internal or back-bone tungsten atoms are also five coordinate, P2WO3, where two bridging OR groups occupy axial and the two W--P bonds and one W--OR terminal group occupy equatorial sites of a trigonal bipyramid. The cluster geometry is compared with those seen for W3(μ3-X)(OR)9, where X = CCH3 and P, W4(OiPr)12 and W4(OEt)16. The latter contains a central centrosymmetric W16+4 cluster as does the present compound and the presence of the distorted rhomboidal geometry observed in both is proposed to arise from a second order Jahn-Teller distortion.
Dreikomponentenreaktionen unter photochemischen Bedingungen--der Transformationsweg des P4-Phosphors in der Koordinationssphäre von Co-Komplexen
Creators: name: Scheer, Manfred
name: Becker, Uta
Publisher: name: Universität Regensburg
Year: 1997
Subjects: subject: Px ligands; P4-Bicyclotetraphosphan; Co complexes; Cyclotetraphosphines
subject: 540 Chemie

description: Die Photolyse von [CpxCo(CO)2] (Cpx = Cp, Cp′, Cp″, Cptriple prime, Cp5; Cp = η5-C5H5, Cp′ = η5-C5Ht4Bu, Cp″ = η5-C5Ht3Bu2, Cptriple prime = η5-C5Ht2Bu3, Cp5 = η5-C5Ph5) mit P4-Phosphor bei Raumtemperatur in Gegenwart von [Cr(CO)5(THF)] liefert die Bicyclotetraphosphankomplexe [CpxCo(CO)(η1:1-P4){Cr(CO)5}4] (1: Cpx = Cp, 2: Cpx = Cp′, 3: Cpx = Cp″). Als Hauptprodukte werden die cyclo-P4-Ligandkomplexe [CpxCo(η4-P4){Cr(CO)5}4] (4: Cpx = Cp, 5: Cpx = Cp′) bzw. [CpxCo(η4-P4){Cr(CO)5}3](6: Cpx = Cp″, 7: Cpx = Cptriple prime, 8: Cpx = Cp5) isoliert. Untersuchungen des Reaktionsweges zeigen, daß sich im ersten Schritt die Bicyclotetraphosphankomplexe 1-3 bilden, aus denen nach CO-Abspaltung und (P-P)-Bindungsbruch die cyclo-P4-Ligandkomplexe 4-8 entstehen. Sowohl das Koordinationsverhalten des cyclo-P4-Liganden als auch die nichtparallele Anordnung der P4- und Cpx-Ringe hängt von der Natur der organischen Substituenten am Cpx-Liganden ab. Der Neigungswinkel zwischen der P4- und Cpx-Ebene steigt in der Reihe Cpx = Cp″ < Cptriple prime < Cp5 von 4 auf 9°. Temperaturabhängige 31P-NMR-Studien ergeben verschiedene Rotationsbarrieren in Abhängigkeit vom jeweiligen Cpx-Liganden (6: ΔG≠Tc = 39.1 kJ mol−1). 7 und 8 zeigen in Lösung eine hohe Tendenz [Cr(CO)5]-Gruppen abzuspalten. Auf diese Weise werden Verbindungen mit nur zwei bzw. einer [Cr(CO)5]-Einheit gebildet.
Reaction behaviour of a complex containing a tungsten phosphorus triple bond with -acceptor compounds of group 13
Creators: name: Scheer, Manfred
name: Müller, Jan
name: Baum, Gerhard
name: Häser, Marco
Publisher: name: Universität Regensburg
Year: 1998
Subjects: subject: 540 Chemie

description: [LWPGaCl3] 5 [L = N(CH2CH2NSiMe3)3] is prepared by treatment of [LWP] with (GaCl3)2; decomposition of 5 in CH2Cl2 affords dimerisation under Me3SiCl elimination to give a cationic W2P2 tetrahedral complex 6; both complexes are structurally characterised.
Long-term trends in aerosol properties derived from AERONET measurements
Creators: name: Zhang, Zhenyu
name: Li, Jing
name: Che, Huizheng
name: Dong, Yueming
name: Dubovik, Oleg
name: Eck, Thomas
name: Gupta, Pawan
name: Holben, Brent
name: Kim, Jhoon
name: Lind, Elena
name: Saud, Trailokya
name: Tripathi, Sachchida Nand
name: Ying, Tong
Publisher: name: EGU
Year: 2024

description: Over the past two decades, remarkable changes in aerosol compositions have been observed worldwide, especially over developing countries, potentially resulting in considerable changes in aerosol properties. The Aerosol Robotic Network (AERONET) offers high precision measurements of aerosol optical parameters over about 1700 stations globally, many of which have long-term measurements for one or more decades. Here we use AERONET Level 2.0 quality assured measurements to investigate long-term trends for aerosol optical depth (AOD) and Ångström exponent (AE) trends, and quality-controlled Level 1.5 inversion products to analyze trends of absorption aerosol optical depth (AAOD) and single scattering albedo (SSA) at stations with long-term records. We also classify the aerosol properties in these sites into 6 types, and analyze the trends of each type. Results reveal decreases in AOD over the majority of the stations, except for North India and the Arabian Peninsula, where AOD increased. AE also decreased in Europe, eastern North America, and the Middle East, but increased over South Asia and East Asia. The decreased AE over Europe and eastern North America is likely due to decreased fine-mode anthropogenic aerosols, whereas that over the Arabian Peninsula is attributed to increased dust activities. Conversely, increased AE over North India is probably attributed to increased anthropogenic emissions and decreased dust loading. Most stations in Europe, North America, East Asia, and South Asia exhibit negative trends in AAOD, whereas Solar_Village in the Arabian Peninsula has positive trends. SSA at most stations increases and exhibits opposite trends to AAOD, but with several stations in central Europe and North America showing decreased SSA values. Trend analysis of different aerosol types further reveals the changes of different aerosol components that are related to AOD, AE, AAOD, and SSA trends. Stronger reductions in fine-mode absorbing species than that of non-absorbing aerosols are found over Europe and East Asia, whereas in eastern North America the reductions of aerosols are dominated by non-absorbing species. Increased aerosols in Kanpur over North India should be mainly comprised of scattering species, whereas those in Solar_Village over the Arabian Peninsula are mainly dust. Weak seasonality is found in the trends of all aerosol parameters analyzed in this work.
The targum (1878:Feb.)
Creators: name: No Name Supplied
Publisher: name: Targum Association
Year: 1878

description: Some University historians indicate that the Targum was first published as an annual in 1867, but of this we have no extant evidence. In January 1869, the Targum as we now know it, made its appearance as a monthly paper that concerned itself with student “literary contributions” and college news as well as serving as a vehicle for bringing news to alumni and the general public. The newspaper, which originally was for sale, varied in frequency over the years as did its title (The Targum, Rutgers Targum, Rutgers Daily Targum, and Daily Targum). The newspaper has continuously been published since 1869 with the exception of 19 months during the second world war, between February 1944 and October 1945. The Targum was published by the students of Rutgers College, and later Rutgers University—New Brunswick represented through the years as the Targum Association, Rutgers Targum Association, and Rutgers College Targum. As a student organization, the Targum operated under the oversight of the dean of students and student government but in October 1980, the Targum became an independent college paper.
An exploration of urban green equity in North America
Creators: name: Nesbitt, Lorien
Publisher: name: University of British Columbia
Year: 2017

description: Urban vegetation provides a suite of ecosystem services to urban residents, from regulating microclimate to supporting good physical health. As more and more people make cities their home, urban vegetation is becoming a key part of urban residents’ well-being. Urban green equity is a central aspect of the distribution of and governance over urban vegetation and its associated ecosystem services. While issues of equity in urban forestry are of clear importance in a just society, it is unclear how the concept should be defined and analyzed. To begin to address this gap, this dissertation 1) examines the theoretical dimensions of urban green equity from multiple perspectives, 2) explores how urban forestry practitioners understand and use the concept of urban green equity in three case-study cities in the United States (US), and 3) conducts a spatial analysis of distributional green equity across 10 urbanized areas in the US. The research found 1) that there are multiple, related dimensions of urban green equity centred around two principle dimensions: distribution of urban vegetation and recognition of stakeholders in urban vegetation decision making, 2) that urban forestry practitioners collectively have a nuanced and complex understanding of urban green equity and tend to focus on distributional equity in their definitions and use of the concept, and 3) that distributional green inequity exists across multiple urbanized areas in the US, education and income are the factors most strongly predictive of the spatial distribution of urban vegetation, and public parks tend to be more equitably distributed than mixed and woody vegetation in cities. It is my hope that these results, and the methodological and conceptual approaches and frameworks provided by this research will be used to advance the rigorous study of urban green equity and improve urban green equity in practice in cities around the world.
Different reaction modes of supermesitylphosphaalkyne with [W(CO)5thf]-unusual C-H-activation forming an indanyl substituent
Creators: name: Kramkowski, Peter
name: Scheer, Manfred
name: Baum, Gerhard
Publisher: name: Universität Regensburg
Year: 1998
Subjects: subject: Supermesitylphosphaalkyne; Tungsten complexes; Dimerisation; Phosphinidene complexes; C–H-Activation
subject: 540 Chemie

description: Treatment of the phosphaalkyne P6-point triple bond; length half of m-dashCAr′ 1 with [W(CO)5(thf)] leads to the complex [W(CO)2{η2-PCAr′)W(CO)5}2] 2 (Ar′=C6H2tBu3-2,4,6) with two side-on coordinated phosphaalkyne moieties. In the presence of equimolar amounts of [W2(OtBu)6], however, the formation of [W(CO)4P(R′)C(Ar′)P{W(CO)5}] 3 (R′=2,4-tBu2-7-Me2-indanyl) is observed. 3 is a product of a ‘head-to-tail' dimerisation of the former phosphaalkynes 1 to give a novel phosphinidene complex containing an indanyl substituent formed via C–H-activation.
Komplexe mit Phosphor und Arsen als terminalen Liganden
Creators: name: Scheer, Manfred
name: Müller, Jan
name: Häser, Marco
Publisher: name: Universität Regensburg
Year: 1996
Subjects: subject: Arsenidokomplexe; Komplexe mit Pnictidliganden; Phosphidokomplexe; Wolframverbindungen
subject: 540 Chemie

description: Komplexe mit terminalen Pnictidliganden interessieren sowohl als solche als auch als Liganden für die Komplexierung von Lewis-Säuren. Hier werden unter anderem die Synthesen von 1, E = P, As, und 2, M = Cr, W, beschrieben und umfangreiche theoretische Studien zur relativen thermodynamischen Stabilität dieser und analog aufgebauter Komplexe vorgestellt.
Antimony as a symmetrically bridged ligand in a novel neutral complex
Creators: name: Scheer, Manfred
name: Müller, Jan
name: Häser, Marco
Publisher: name: Universität Regensburg
Year: 1998
Subjects: subject: 540 Chemie

description: LWSbWL] 7 (L = N(CH2CH2N(Np))3; Np = CH2CMe3) is prepared by treatment of [LWCl] 5 with LiSb(SiMe3)2- (dme)n; the ethylene complex [LWCl(C2H4)] 6 is a side product in the synthesis of 5; all complexes are structurally characterised.
title: UEL Research Data Management Policy
Creators: name: University Of East London,
name: University Of East London
Publisher: name: University of East London
Year: 2019

description: The University of East London (UEL) recognises that quality research demands effective data management in the support of academic integrity, openness, and good information governance. UEL will ensure that research data is managed to high standards throughout the research data lifecycle as part of its commitment to academic excellence.

This policy will ensure that UEL acts in accordance with UK Research and Innovation's Common principles on data policy, requirements of funding bodies, and general best practice.

This policy was adopted by Academic Board on 27th February 2019.
Unusual Reactivity of a Cr2P2 Tetrahedral Complex toward Superhydride; Formation of [{CpCr(CO)2}2(μ-PH2)x(μ-H)2-x] (x = 1 and 2) and [{CpCr(CO)2}2(μ-PH){(CpCr)2(μ,η1:η1:η5:η5-P5)}]
Creators: name: Sekar, Perumal
name: Scheer, Manfred
name: Voigt, Andreas
name: Krimse, Reinhard
Publisher: name: Universität Regensburg
Year: 1999
Subjects: subject: 540 Chemie

description: Reaction of [{CpCr(CO)2}2(μ,η2-P2)] (1) with LiBEt3H in THF at −78 °C affords the new phosphanido complexes [{CpCr(CO)2}2(μ-PH2)(μ-H)] (2), [{CpCr(CO)2}2(μ-PH2)2] (3), and [{CpCr(CO)2}2(μ-PH){(CpCr)2(μ,η1:η1:η5:η5-P5)}] (4), which have been characterized by single-crystal X-ray diffraction methods. The structure of 4 reveals a triple-decker sandwich complex with a distorted cyclo-P5 middle deck. The EPR spectrum of the paramagnetic (S‘ = 1/2) complex 4 (T = 130 K) is interpreted with a rhombic-symmetric spin Hamiltonian. A noticeable hyperfine interaction with two 31P nuclei is observed.
A Discrete Parametric Markov-Chain Model Of A Two Unit Cold Standby System With Appearance And Disappearance Of Repairman
Creators: name: Gupta, Rakesh
name: Bhardwaj, Parul
Publisher: name: Reliability: Theory & Applications
Year: 2019
Subjects: Transition probability
mean sojourn time
regenerative point
reliability
MTSF
availability of system
busy period of repairman

description: The paper deals with the stochastic analysis of a two-identical unit cold standby system model assuming two modesnormal and total failure. A single repair facility appears in and disappears from the system randomly. The random variables denoting the failure time, repair time, time to appearance and time to disappearance of repairman are independent of discrete nature having geometric distributions with different parameters. The various measures of system effectiveness are obtained by using regenerative point technique.
A Discrete Parametric Markov-Chain Model Of A Two-Unit Cold Standby System With Repair Efficiency Depending On Environment
Creators: name: Gupta, Rakesh
name: Tyagi, Arti
Publisher: name: Reliability: Theory & Applications
Year: 2019
Subjects: Transition probability
Regenerative point
reliability
MTSF
availability of system
busy period of repairman

description: The paper deals with stochastic analysis of a two identical unit cold standby system model with two modes of the units-normal (N) and total failure (F). A single repairman is always available with the system to repair a failed unit. Two physical conditions-good and poor of repairman depending upon the perfect and imperfect environment are considered. The system transits from perfect to imperfect environment and vice-versa after random periods of time. The failure and repair times of a unit are taken as independent random variables of discrete nature having geometric distributions with different parameters.
Novel Approach to Intermediates Containing a Tungsten−Arsenic Triple Bond
Creators: name: Johnson, Brian P.
name: Schiffer, Michael
name: Scheer, Manfred
Publisher: name: Universität Regensburg
Year: 2000
Subjects: subject: 540 Chemie

description: Thermolysis of the arsenidene complex [Cp*As{W(CO)5}2] (1) gave [Cp*(CO)2W(η3-As3)] (2), [{W(CO)3Cp*W}2(μ3-As)4] (3), and [{W(CO)3Cp*W}2(μ3-As)3{μ3-AsW(CO)5}] (4). The products show that 1 has undergone a Cp* migration from the σ-bound state at the As atom to η5 coordination at the transition metal, presumably via an intermediate of the type [Cp*(CO)2WAs→W(CO)5]. In a second transformation pathway removal of the Cp* group of the arsenidene complex 1 occurs to form an unsaturated species of the type [As{W(CO)5}2]. Compound 2 exhibits the unusual formation of a cyclo-As3 ligand, while the tetrahedral tungsten clusters 3 and 4 represent possible tetramers of the intermediates formed in both pathways. Furthermore, photolysis of arsenidene complex 1 results in [As2{W(CO)5}3] (5), which shows that the second pathway prevails under these conditions.
Introduction to Nonlinear Phenomena in Superfluid Liquids and Bose-Einstein Condensates: Helium, Semiconductors and Graphene
Creators: name: Berman, Oleg L.
name: Kezerashvili, Roman Ya.
name: Kolmakov, German V.
Publisher: name: arXiv
Year: 2011
Subjects: subject: Mesoscale and Nanoscale Physics (cond-mat.mes-hall)
subject: Strongly Correlated Electrons (cond-mat.str-el)
subject: FOS: Physical sciences

description: We review current understanding of the non-equilibrium dynamics of collective quantum systems. We describe an approach based on the Hamiltonian formulation of superfluid hydrodynamics. It is shown that, in the presence of constant energy pumping, the nonlinear coupling of fluctuations in the density and entropy strongly affects the nonequilibrium dynamics of the system. We use the results obtained to analyze the properties of out-of-equilibrium superfluid 4He and of exciton polariton Bose-Einstein condensates, both in semiconductor quantum wells and in graphene layers in presence of high magnetic field.
description: 34 pages, 8 figures
Complexes with a Monohapto Bound Phosphorus Tetrahedron and Phosphaalkyne
Creators: name: Gröer, Thomas
name: Baum, Gerhard
name: Scheer, Manfred
Publisher: name: Universität Regensburg
Year: 1998
Subjects: subject: 540 Chemie

description: The reaction of white phosphorus with the coordinatively unsaturated [M(CO)3(PR3)2] complexes (M = Mo, W; R = Cy, Pri) yields the compounds [M(CO)3(PR3)2(η1-P4)] in which the P4-tetrahedron is end-on bonded to the metal. In the same manner reacts Ar‘CP (Ar‘ = C6H2But3-2,4,6) with this complex to give [W(CO)3(PCy3)2(η1-PCAr‘)]. The X-ray structures of the products are discussed, and for the P4-unit in [W(CO)3(PCy3)2(η1-P4)] the librational analysis was performed to correct their translational and rotational motions.
Spectroscopy and Regge trajectories of heavy baryons in the relativistic quark-diquark picture
Creators: name: Ebert, D.
name: Faustov, R. N.
name: Galkin, V. O.
Publisher: name: arXiv
Year: 2011
Subjects: subject: High Energy Physics - Phenomenology (hep-ph)
subject: High Energy Physics - Experiment (hep-ex)
subject: FOS: Physical sciences

description: Mass spectra of heavy baryons are calculated in the heavy-quark--light-diquark picture in the framework of the QCD-motivated relativistic quark model. The dynamics of light quarks in the diquark as well as the dynamics of the heavy quark and light diquark in the baryon are treated completely relativistically without application of nonrelativistic v/c and heavy quark 1/m_Q expansions. Such approach allows us to get predictions for the heavy baryon masses for rather high orbital and radial excitations. On this basis the Regge trajectories of heavy baryons for orbital and radial excitations are constructed, and their linearity, parallelism, and equidistance are verified. The relations between the slopes and intercepts of heavy baryons are considered and a comparison of the slopes of Regge trajectories for heavy baryons and heavy-light mesons is performed. All available experimental data on heavy baryons fit nicely to the constructed Regge trajectories. The possible assignment of the quantum numbers to the observed excited charmed baryons is discussed.
description: 25 pages, 10 figures
A Two Identical Unit Cold Standby System Subject To Two Types Of Failures
Creators: name: Chaudhary, Pradeep
name: Tomar, Rashmi
Publisher: name: Reliability: Theory & Applications
Year: 2019
Subjects: Reliability
Mean time to system failure
availability
expected busy period of repairman
net expected profit

description: The paper deals with a system model composed of a two identical unit standby system in which initially one is operative and other is kept as cold standby. Each unit of the system has two possible modes – Normal (N) and Total Failure (F). An operating unit may fail either due to normal or due to chance causes. A single repairman is always available with the system to repair a unit failed due to any of the above causes. The system failure occurs when both the units are in total failure mode. The failure time distributions of a unit failed due to both the causes are taken as exponentials with different parameters whereas the repair time distributions of a failed unit in both types of failure are taken as general with different CDFs. Using regenerative point technique, the various important measures of system effectiveness have been obtained.
Analysis of Reliability Measures of Two Identical Unit System with One Switching Device and Imperfect Coverage
Creators: name: Akshita Sharma
name: Kumar, Pawan
Publisher: name: Reliability: Theory & Applications
Year: 2019
Subjects: reliability
availability
regenerative point technique
rebooting
coverage probability

description: The present paper deals with the reliability analysis of a two identical unit system model with safe and unsafe failures, switching device and rebooting. Initially one of the units is in operative state and other is kept in standby mode. A single repairman is always available with the system for repairing and rebooting the failed units. In case of unsafe failure, repair cannot be started immediately but first rebooting is done which transforms the unsafe failure to safe failure and thereafter repair is carried out as usual. Switching device is used to put the repaired and standby units to operation. The failure time distributions of both the units and switch are also assumed to be exponential while the repair time distributions are taken general in nature. Reboot delay time is assumed to be exponentially distributed. Using regenerative point techniques, various measures of system effectiveness such as transition probabilities, availability, busy period, expected numbers of repairs etc. have been obtained, to make the study more informative some of them have been studied graphically.
Performance Measures Of A Two Non-Identical Unit System Model With Repair And Replacement Policies
Creators: name: Gupta, Urvashi
name: Kumar, Pawan
Publisher: name: Reliability: Theory & Applications
Year: 2019
Subjects: Preparation
Signal
Repair and Replacement

description: The present paper deals with two non-identical units A and B, both are in operative mode. If the unit A fails then it is taken up for preparation of repair before entering into repair mode and the unit-B gives a signal for repair before going into failure mode. If the unit gets repaired then it becomes operative otherwise it is replaced by the new one. A single repairman is always available with the system to repair the failed units and the priority in repair is always given to the unit-A. The failure time distributions of both the units are taken as exponential and the repair time distributions are taken as general. Using regenerative point technique the various characteristics of the system effectiveness have been obtained such as Transition Probabilities and Mean Sojourn times, Mean time to system failure (MTSF), Availability of the system, Busy Period of repairman, Expected number of Replacement, Expected profit incurred.
Structure and reactivity of transition metal substituted dichloroantimony and dichlorobismuth complexes
Creators: name: Gröer, Thomas
name: Scheer, Manfred
Publisher: name: Universität Regensburg
Year: 2000
Subjects: subject: 540 Chemie

description: The dichloro Group 15 complexes [{Cpx(CO)2Fe}BiCl2] (Cpx = Cp, 5-C5H3tBu2{Cp}) 1a, b and [{Cp(CO)2Fe}SbCl2] 3 are prepared. The crystal structure determination of 1b and 3 shows a polymeric chlorine bridged structure for the bismuth complex 1b whereas for the antimony compound 3 a molecular structure with weak intermolecular chlorine bridges is found. The reaction of 1a or 3 with magnesium leads to the threefold transition-metal substituted complexes [(µ3-E){Fe(CO)2Cpx}3] ( 5: E = Bi, Cpx = Cp; 7: E = Sb, Cpx = Cp), whereas the analogous reaction of 1b results in the disubstituted bismuth chloro complex [{Cp(CO)2Fe}2BiCl] 6. Finally, the reaction of an equimolar mixture of 1a and 3 with magnesium yields the novel antimony-bridged compound [(µ3-Sb){Fe2(µ-CO)(CO)2Cp2}{Fe(CO)2Cp}] 8.
Mariana Serpentinite Mud Volcanoes CORK-Lite Expedition November 2022 and Borehole Fluid Compositions
Creators: name: Wheat, Charles Geoffrey
Publisher: name: Zenodo
Year: 2023
Subjects: Serpointinite
Mariana Mud Volcanoes
CORK-Lite
Subduction

description: During IODP Expedition 366 (Mariana Convergent Margin) three boreholes were drilled. Then casing with perforations were installed. These cased boreholes provided the structure for potential experiments within the serpentinite matrix. However, these cased boreholes require the installation of a CORK-Lite, which allows the borehole to be sealed. CORK-Lites also provide the ability to sample the formation via several ports and by removing the top plug. 
One of the files that is provided is a cruise report from the expedition in November-December 2022 to the Mariana serpentinite mud volcanoes. During this expedition we installed CORK-Lites into each of the three boreholes.  After installation we sampled the borehole water with various degrees of success, because of the natural formation and issues with sealing one of the CORK-Lites. 
A second file contains the fluid compositional data for samples collected with gas-tight samplers (IGT Seewald Samplers). Water samples were analyzed using standard methods such as titration (chlorinity), ICP-OES (Inductively Coupled Plasma - Optical Emission Spectrometry) and ICP-MS (Inductively Coupled Plasma - Mass Spectrometry).
The third files is a compilation of data that represent the most pristine fluids collected shortly after the CORK-lites were deployed relative to published concentrations. Published concentrations are based on pore water data from IODP Exp 366 and from earlier borehole collections of a fourth borehole system ODP Hole 1200C.
Real-time terahertz near-field microscope
Creators: name: Blanchard, F.
name: Doi, A.
name: Tanaka, T.
name: Hirori, H.
name: Tanaka, H.
name: Kadoya, Y.
name: Tanaka, K.
Publisher: name: arXiv
Year: 2011
Subjects: subject: Optics (physics.optics)
subject: FOS: Physical sciences

description: Terahertz (THz) waves have been significantly developed in the last fifteen years because of their great potential for applications in industrial and scientific communities1,2. The unique properties of THz waves as transparency for numerous materials and strong absorption for water-based materials are expected to broadly impact biosensing3 such as medical imaging4, chemical identifications5, and DNA recognition6. In particular, for accessing information within a scale comparable to the cell size where interactions between cell membrane and other organelle structures occur, micron size spatial resolution is required. Due to the large wavelength, however, the joint capability of THz near-field imaging with real-time acquisition, which is a highly desirable ability for observing real-time changes of in vivo sample, remains undone. Here, we report a real-time THz near-field microscope with a high dynamic range that can capture images of a 370 x 740 μm2 area at 35 frames per second. We achieve high spatial resolution on a large area by combining two novel techniques: THz pulse generation by tilted-pulse-front excitation7 and electro-optic (EO) balanced imaging detection using a thin crystal. To demonstrate the microscope capability, we reveal the field enhancement at the gap position of a dipole antenna after the irradiation of a THz pulse. Our results are the first demonstration of a direct quantification of a 2-dimensional subwavelength THz electric field taken in real-time.
description: 5 figures
Rotational velocities of nearby young stars
Creators: name: Weise, Patrick
name: Launhardt, Ralf
name: Setiawan, Johny
name: Henning, Thomas
Publisher: name: arXiv
Year: 2010
Subjects: subject: Solar and Stellar Astrophysics (astro-ph.SR)
subject: Instrumentation and Methods for Astrophysics (astro-ph.IM)
subject: FOS: Physical sciences

description: Stellar rotation is a crucial parameter driving stellar magnetism, activity and mixing of chemical elements. Furthermore, the evolution of stellar rotation is coupled to the evolution of circumstellar disks. Disk-braking mechanisms are believed to be responsible for rotational deceleration during the accretion phase, and rotational spin-up during the contraction phase after decoupling from the disk for fast rotators arriving at the ZAMS. We investigate the projected rotational velocities vsini of a sample of young stars with respect to the stellar mass and disk evolutionary state to search for possible indications of disk-braking mechanisms. We analyse the stellar spectra of 220 nearby (mostly <100pc) young (2-600 Myr) stars for their vsini, stellar age, Halpha emission, and accretion rates. The stars have been observed with FEROS and HARPS in La Silla, Chile. The spectra have been cross-correlated with appropriate theoretical templates. We build a new calibration to be able to derive vsini values from the cross-correlated spectra. Stellar ages are estimated from the LiI equivalent width at 6708 Ang. The equivalent width and width at 10% height of the Halpha emission are measured to identify accretors and used to estimate accretion rates. The vsini is then analysed with respect to the evolutionary state of the circumstellar disks to search for indications of disk-braking mechanisms in accretors. We find that the broad vsini distribution of our targets extends to rotation velocities of up to more than 100 km/s and peaks at a value of 7.8+-1.2 km/s, and that ~70% of our stars show vsini<30 km/s. Furthermore, we can find indications for disk-braking in accretors and rotational spin-up of stars which are decoupled from their disks. In addition, we show that a number of young stars are suitable for precise radial-velocity measurements for planet-search surveys.
description: 16 pages, 6 figures, accepted for publication in A&A
Assessment And Prediction Of Reliability Of An Automobile Component Using Warranty Claims Data
Creators: name: Tahsina Aziz
name: M. Rezaul Karim
Publisher: name: Reliability: Theory & Applications
Year: 2019
Subjects: Automobile component; Failure mode; Maximum likelihood estimate; Reliability; Warranty claims data; Warranty claim rate

description: This paper presents an analysis of warranty claims data of a component of an automobile. The objectives of the analysis are to assess and predict the reliability of the component. To do these the paper present nonparametric and parametric analyses for the lifetime variable, age in month, based on warranty claims data. It also investigates on the variation of reliability of the component with respect to month of production and dominant failure modes. The paper will be useful to the manufacturer for assessing and predicting reliability and warranty costs and for assuring customer satisfaction and product reputation.