cometadata/datacite-rtg-text-other-reclassification-records huggingface dataset:
Finite dimensional reduction and convergence to equilibrium for incompressible Smectic-A liquid crystal flows
Creators: name: Segatti, Antonio
name: Wu, Hao
Publisher: name: arXiv
Year: 2010
Subjects: subject: Analysis of PDEs (math.AP)
subject: FOS: Mathematics
subject: 35B41, 35Q35, 76A15, 76D05

description: We consider a hydrodynamic system that models the Smectic-A liquid crystal flow. The model consists of the Navier-Stokes equation for the fluid velocity coupled with a fourth-order equation for the layer variable $\vp$, endowed with periodic boundary conditions. We analyze the long-time behavior of the solutions within the theory of infinite-dimensional dissipative dynamical systems. We first prove that in 2D, the problem possesses a global attractor $\mathcal{A}$ in certain phase space. Then we establish the existence of an exponential attractor $\mathcal{M}$ which entails that the global attractor $\mathcal{A}$ has finite fractal dimension. Moreover, we show that each trajectory converges to a single equilibrium by means of a suitable Lojasiewicz--Simon inequality. Corresponding results in 3D are also discussed.
Theory of STM junctions for π-conjugated molecules on thin insulating films
Creators: name: Sobczyk, Sandra
name: Donarini, Andrea
name: Grifoni, Milena
Publisher: name: Universität Regensburg
Year: 2012
Subjects: subject: 530 Physik

description: A microscopic theory of the transport in a scanning tunneling microscope (STM) setup is introduced for π-conjugated molecules on insulating films, based on the density matrix formalism. A key role is played in the theory by the energy dependent tunneling rates which account for the coupling of the molecule to the tip and to the substrate. In particular, we analyze how the geometrical differences between the localized tip and extended substrate are encoded in the tunneling rate and influence the transport characteristics. Finally, using benzene as an example of a planar, rotationally symmetric molecule, we calculate the STM current-voltage characteristics and current maps and analyze them in terms of few relevant angular momentum channels.
Gesetzesfolgenabschätzung zum Digital Markets Act – zur Verhaltenspflicht Art. 6 V DMA
Creators: name: Tischner, Mads
Publisher: name: Bayreuther Zeitschrift für Rechtswissenschaft
Year: 2023

description: Eine Gesetzesfolgenabschätzung des DMA anhand des Beispiels Art. 6 Abs. 5 DMA. Mit Hilfe von Ziel-, Effektivitäts-, Kosten- und Verhältnismäßigkeitsanalyse wird die Verhaltenspflicht mit den Instrumenten Art. 102 AEUV und einer "europäisierten" Form von § 19a Abs. 2 S. 1 Nr. 1 GWB verglichen. Im Ergebnis wird für Art. 6 Abs. 5 DMA unter den getroffenen Annahmen das beste Kosten-Nutzen-Verhältnis der drei Regelungsalternativen festgestellt.
description: Bayreuther Zeitschrift für Rechtswissenschaft, Bd. 1 Nr. 5 (2023): 5. Ausgabe der Bayreuther Zeitschrift für Rechtswissenschaft (Schwerpunkt: Recht im Wandel)
Herstellerverantwortung für Verkehrsunfälle von Kraftfahrzeugen mit autonomer Funktion
Creators: name: Hofmeister, Roxana
Publisher: name: Bayreuther Zeitschrift für Rechtswissenschaft
Year: 2023

description: Fühlen Sie sich bereit, in ein autonomes Fahrzeug zu steigen und sich an Ihr gewünschtes Ziel fahren zu lassen? Vermutlich würden Sie eher dazu tendieren, diese Frage zu bejahen, wenn es einen funktionierenden Rechtsrahmen für das autonome Fahren gäbe. Wesentliche Haftungssubjekte hierfür sind auch die Herstellerunternehmen. Ziel dieser Seminararbeit ist es, die bestehenden deutschen zivilrechtlichen Haftungsregime für Herstellerunternehmen auf ihre Flexibilität mit dem Fortschritt des autonomen Fahrens zu überprüfen.
description: Bayreuther Zeitschrift für Rechtswissenschaft, Bd. 1 Nr. 5 (2023): 5. Ausgabe der Bayreuther Zeitschrift für Rechtswissenschaft (Schwerpunkt: Recht im Wandel)
Is the distant globular cluster Pal 14 in a deep-freeze?
Creators: name: Kuepper, Andreas H. W.
name: Kroupa, Pavel
Publisher: name: arXiv
Year: 2010
Subjects: subject: Astrophysics of Galaxies (astro-ph.GA)
subject: Solar and Stellar Astrophysics (astro-ph.SR)
subject: FOS: Physical sciences

description: We investigate the velocity dispersion of Pal 14, an outer Milky-Way globular cluster at Galactocentric distance of 71 kpc with a very low stellar density (central density 0.1-0.2 Msun/pc^3). Due to this low stellar density the binary population of Pal 14 is likely to be close to the primordial binary population. Artificial clusters are generated with the observed properties of Pal 14 and the velocity dispersion within these clusters is measured as Jordi et al. (2009) have done with 17 observed stars of Pal 14. We discuss the effect of the binary population on these measurements and find that the small velocity dispersion of 0.38 km/s which has been found by Jordi et al. (2009) would imply a binary fraction of less than 0.1, even though from the stellar density of Pal 14 we would expect a binary fraction of more than 0.5. We also discuss the effect of mass segregation on the velocity dispersion as possible explanation for this discrepancy, but find that it would increase the velocity dispersion further. Thus, either Pal 14 has a very unusual stellar population and its birth process was significantly different than we see in today's star forming regions, or the binary population is regular and we would have to correct the observed 0.38 km/s for binarity. In this case the true velocity dispersion of Pal 14 would be much smaller than this value and the cluster would have to be considered as "kinematically frigid", thereby possibly posing a challenge for Newtonian dynamics but in the opposite sense to MOND.
description: 8 pages, 4 figures, accepted for publication in ApJ
Spin-channel Keldysh field theory for weakly interacting quantum dots
Creators: name: Smirnov, Sergey
name: Grifoni, Milena
Publisher: name: Universität Regensburg
Year: 2012
Subjects: subject: 530 Physik

description: We develop a low-energy nonequilibrium field theory for weakly interacting quantum dots. The theory is based on the Keldysh field integral in the spin channel of the quantum dot described by the single-impurity Anderson Hamiltonian. The effective Keldysh action is a functional of the Hubbard-Stratonovich magnetization field decoupling the quantum dot spin channel. We expand this action up to the second order with respect to the magnetization field, which allows one to describe nonequilibrium interacting quantum dots at low temperatures and weak electron-electron interactions, up to the contacts-dot coupling energy. Besides its simplicity, an additional advantage of the theory is that it correctly describes the unitary limit, giving the correct result for the conductance maximum. Thus our theory establishes an alternative simple method relevant for investigation of weakly interacting nonequilibrium nanodevices.
The structure of spider's web fast escaping sets
Creators: name: Osborne, J. W.
Publisher: name: arXiv
Year: 2010
Subjects: subject: Dynamical Systems (math.DS)
subject: Complex Variables (math.CV)
subject: FOS: Mathematics
subject: 30D05, 37F10

description: Building on recent work by Rippon and Stallard, we explore the intricate structure of the spider's web fast escaping sets associated with certain transcendental entire functions. Our results are expressed in terms of the components of the complement of the set (the 'holes' in the web). We describe the topology of such components and give a characterisation of their possible orbits under iteration. We show that there are uncountably many components having each of a number of orbit types, and we prove that components with bounded orbits are quasiconformally homeomorphic to components of the filled Julia set of a polynomial. We also show that there are singleton periodic components and that these are dense in the Julia set.
description: 18 pages
Prevalence of Eligibility Criteria for the Systolic Blood Pressure Intervention Trial in US Adults Among Excluded Groups: Age Less Than 50 Years, Diabetes Mellitus, or a History of Stroke
Creators: name: Bress, Adam P.
name: Tanner, Rikki M.
name: Hess, Rachel
name: Gidding, Samuel S.
name: Colantonio, Lisandro D.
name: Shimbo, Daichi
name: Muntner, Paul
Publisher: name: Columbia University
Year: 2016
Subjects: Epidemiology
Hypertension
Cardiology
Medical care--Evaluation

description: BACKGROUND: Adults <50 years old, with diabetes mellitus, or a history of stroke were not enrolled in the Systolic Blood Pressure Intervention Trial (SPRINT). Estimating the size and characteristics of these excluded groups who meet the other SPRINT eligibility criteria may provide information on the potential impact of providers extending the SPRINT findings to these populations.

METHODS AND RESULTS: We analyzed the National Health and Nutrition Examination Survey 2003-2012 (n=25 076) to estimate the percentage and characteristics of US adults ≥20 years in 3 populations (age <50 years, diabetes mellitus, or history of stroke) excluded from SPRINT who otherwise meet the trial eligibility criteria: age ≥ 50 years, systolic blood pressure (SBP) 130-180 mm Hg, high cardiovascular disease risk, and not having trial exclusion criteria. Overall, 1.0% (95% CI 0.8-1.3) of US adults age <50 years, 25.4% (95% CI 23.4-27.6) with diabetes mellitus, and 19.0% (95% CI 16.0-22.4) with history of stroke met the other SPRINT eligibility criteria. Among US adults with SBP ≥ 130 mm Hg, other SPRINT eligibility criteria were met by 7.5% (95% CI 6.1-9.2) of those age <50 years, 32.9% (95% CI 30.5-35.4) with diabetes mellitus, and 23.0% (95% CI 19.4-27.0) with history of stroke. Among US adults meeting the other SPRINT eligibility criteria, antihypertensive medication was being taken by 31.0% (95% CI 23.9-41.3) of those <50 years, 63.0% (95% CI 58.2-67.6) with diabetes mellitus, and 68.9% (95% CI 59.4-77.1) with a history of stroke.

CONCLUSIONS: A substantial percentage of US adults with diabetes mellitus or history of stroke and a small percentage <50 years old meet the other SPRINT eligibility criteria.
Constraints on a fine-grained AdS/CFT correspondence
Creators: name: Gary, Mirah
name: Giddings, Steven B.
Publisher: name: arXiv
Year: 2011
Subjects: subject: High Energy Physics - Theory (hep-th)
subject: General Relativity and Quantum Cosmology (gr-qc)
subject: FOS: Physical sciences

description: For a boundary CFT to give a good approximation to the bulk flat-space S-matrix, a number of conditions need to be satisfied: some of those are investigated here. In particular, one would like to identify an appropriate set of approximate asymptotic scattering states, constructed purely via boundary data. We overview, elaborate, and simplify obstacles encountered with existing proposals for these. Those corresponding to normalizable wavefunctions undergo multiple interactions; we contrast this situation with that needed for a flat-space LSZ treatment. Non-normalizable wavefunctions can have spurious interactions, due either to power-law tails of wavepackets or to their non-normalizable behavior, which obscure S-matrix amplitudes we wish to extract; although in the latter case we show that such gravitational interactions can be finite, as a result of gravitational red shift. We outline an illustrative construction of arbitrary normalizable wavepackets from boundary data, that also yields such spurious interactions. Another set of non-trivial questions regard the form of unitarity relations for the bulk S-matrix, and in particular its normalization and multi-particle cuts. These combined constraints, together with those found earlier on boundary singularity structure needed for bulk momentum conservation and other physical/analytic properties, are a non-trivial collection of obstacles to surmount if a fine-grained S-matrix, as opposed to a coarse-grained construction, is to be defined purely from boundary data.
description: 30 pages, 4 figures, harvmac. v2: version (finally) to appear in PRD; with update to reflect more recent developments, and address referee comments
Flow onset of fresh mortars in rheometers: Contribution of paste deflocculation and sand particle migration
Creators: name: Qian, Ye
name: Kawashima, Shiho
Publisher: name: Columbia University
Year: 2016
Subjects: subject: Mortar
subject: Rheology
subject: Shear (Mechanics)
subject: Cement
subject: Civil engineering
subject: FOS: Civil engineering

description: Shear-induced particle migration is widely recognized to be a challenge in characterizing the rheological properties of fresh cement-based mortars. In this study, we aim to quantify shear-induced particle migration by characterizing the stress decay process during constant shear flow with the aid of a modified thixotropy/migration model. It is found that a conventionally used single exponential model is not sufficient to fit the stress decay and describe the destructuration and sand migration of mortar under shear. Instead, a two exponential model is needed to capture the interaction of sand particles and the suspending cement paste phase. Model parameters are used to quantify the effect of sand volume fraction, clay addition, and applied shear rate on the kinetics and intensity of colloidal deflocculation and sand migration. Results provide evidence that the colloidal and granular contributions to the overall stress decay of mortars can be represented by each of the two exponentials.
Comparative investigation on nanomechanical properties of hardened cement paste
Creators: name: Li, Wengui
name: Kawashima, Shiho
name: Xiao, Jianzhuang
name: Corr, David J.
name: Shi, Caijun
name: Shah, Surendra P.
Publisher: name: Columbia University
Year: 2016
Subjects: subject: Materials--Mechanical properties
subject: Nanostructured materials
subject: Cement
subject: Civil engineering
subject: FOS: Civil engineering

description: Three types of nanomechanical methods including static nanoindentation, modulus mapping and peak-force quantitative nanomechanical mapping (QNM) were applied to investigate the quantitative nanomechanical properties of the same indent location in hardened cement paste. Compared to the nanoindentation, modulus mapping and peak-force QNM allow for evaluating local mechanical properties of a smaller area with higher resolution. Beside, the ranges of elastic modulus distribution measured by modulus mapping and peak-force QNM are relatively greater than that obtained from nanoindentation, which may be due to a result of the shaper probe and local confinement effect between multiple phases. Moreover, the average value of elastic modulus obtained using peak-force QNM were consistent with those obtained by modulus mapping, while the different in modulus probability distribution could be related to the different nanomechancial theories and contact forces. The probability distributions of elastic modulus measured using nanomechanical methods to provide a basis for the different types of phases existing in cement paste. Based on the observation with high spatial resolution, cement paste can be likely found as nanocalse granular material, in which different submicron scale or basic nanoscale grain units pack together. It indicates that the peak-force QNM can effectively provide an effective insight into the nanostructure characteristic and corresponding nanomechanical properties of cement paste.
Searching for the highest redshift sources in 250-500 micron submillimeter surveys
Creators: name: Pope, Alexandra
name: Chary, Ranga-Ram
Publisher: name: arXiv
Year: 2010
Subjects: subject: Cosmology and Nongalactic Astrophysics (astro-ph.CO)
subject: FOS: Physical sciences

description: We explore a technique for identifying the highest redshift (z>4) sources in Herschel/SPIRE and BLAST submillimeter surveys by localizing the position of the far-infrared dust peak. Just as Spitzer/IRAC was used to identify stellar `bump' sources, the far-IR peak is also a redshift indicator; although, the latter also depends on the average dust temperature. We demonstrate the wide range of allowable redshifts for a reasonable range of dust temperatures and show that it is impossible to constraint the redshift of individual objects using solely the position of the far-IR peak. By fitting spectral energy distribution models to simulated Herschel/SPIRE photometry we show the utility of radio and/or far-infrared data in breaking this degeneracy. With prior knowledge of the dust temperature distribution it is possible to obtain statistical samples of high redshift submillimeter galaxy candidates. We apply this technique to the BLAST survey of ECDFS to constrain the number of dusty galaxies at z>4. We find 8 +/- 2 galaxies with flux density ratios of S500>S350; this sets an upper limit of 17 +/- 4 deg-2 if we assume all are at z>4. This is <35% of all 500 micron-selected galaxies down to S500>45 mJy (LIR>2e13Lsun for z>4). Modeling with conventional temperature and redshift distributions estimates the percentage of these 500 micron peak galaxies at z>4 to be between 10-85%. Our results are consistent with other estimates of the number density of very high redshift submillimeter galaxies and follows the decline in the star formation rate density at z>4.
description: 9 pages, 4 figures, 1 table; Accepted for publication in ApJL
Rheology of cement paste under high pressure
Creators: name: Kim, Jae Hong
name: Kwon, Seung Hee
name: Kawashima, Shiho
name: Yim, Hong Jae
Publisher: name: Columbia University
Year: 2017
Subjects: subject: Pressure
subject: Rheology
subject: Viscosity
subject: Cement
subject: Civil engineering
subject: FOS: Civil engineering

description: The objective of this study was to investigate whether cementitious materials undergo changes during pumping processes due to pressure variation. The influence of pressure on the rheological properties of cement pastes, which assumably represented the lubricating layer that forms along the profile of concrete during pumping, was evaluated using a rotational rheometer with a high-pressure cell. Cement pastes with water-to-cement ratios ranging from 0.35 to 0.6 were tested according to a protocol designed to simulate the conditions of an actual pumping process based on field tests. The shear rates, shearing durations, and pressure levels from 0 to 30 MPa were experimentally simulated. The test results indicated that below a certain water-to-cement ratio (0.40) elevated pressures lead to changes in the rheological properties, while changes were negligible when the ratio was above this threshold. Further, at low water-to-cement ratios the thixotropy of the cement paste can reverse into rheopexy after pressurization.
Experiments and micromechanical modeling of electrical conductivity of carbon nanotube/cement composites with moisture
Creators: name: Jang, Sung-Hwan
name: Hochstein, Daniel Peter
name: Kawashima, Shiho
name: Yin, Huiming
Publisher: name: Columbia University
Year: 2017
Subjects: subject: Carbon nanotubes
subject: Electric conductivity
subject: Moisture
subject: Cement
subject: Civil engineering
subject: FOS: Civil engineering

description: Carbon nanotube (CNT)/cement composites have been proposed as a multifunctional material for self-sensing and traffic monitoring due to their unique electric conductivity which changes with the application of mechanical load. However, material constituent and environmental factors may significantly affect the potential application of these materials. Therefore, it is necessary to understand an influence of material constituent such as porosity and dispersion of CNT and environmental factor such as moisture on the electrical conductivity of CNT/cement composite. This paper investigates the effect of moisture on the effective electrical conductivity of CNT/cement composites. To prepare the specimens, multi-walled carbon nanotubes (MWCNTs) are well dispersed in cement paste, which is then molded and cured into cubic test specimens. By drying the specimens from the fully saturated state to the fully dry state, the effective electrical conductivity is measured at different moisture contents. As the water in the specimen is replaced by air voids, the electrical conductivity significantly decreases. Different ratios of MWCNTs to cement have been used in this study. Micromechanical models have been used to predict the effective electrical conductivities. A comprehensive model is proposed to take into account the effects of individual material phases on the effective electrical conductivity of CNT/cement composites with moisture effect.
Binaries migrating in a gaseous disk: Where are the Galactic center binaries?
Creators: name: Baruteau, C.
name: Cuadra, J.
name: Lin, D. N. C.
Publisher: name: arXiv
Year: 2010
Subjects: subject: Astrophysics of Galaxies (astro-ph.GA)
subject: Earth and Planetary Astrophysics (astro-ph.EP)
subject: Solar and Stellar Astrophysics (astro-ph.SR)
subject: FOS: Physical sciences

description: The massive stars in the Galactic center inner arcsecond share analogous properties with the so-called Hot Jupiters. Most of these young stars have highly eccentric orbits, and were probably not formed in-situ. It has been proposed that these stars acquired their current orbits from the tidal disruption of compact massive binaries scattered toward the proximity of the central supermassive black hole. Assuming a binary star formed in a thin gaseous disk beyond 0.1 pc from the central object, we investigate the relevance of disk-satellite interactions to harden the binding energy of the binary, and to drive its inward migration. A massive, equal-mass binary star is found to become more tightly wound as it migrates inwards toward the central black hole. The migration timescale is very similar to that of a single-star satellite of the same mass. The binary's hardening is caused by the formation of spiral tails lagging the stars inside the binary's Hill radius. We show that the hardening timescale is mostly determined by the mass of gas inside the binary's Hill radius, and that it is much shorter than the migration timescale. We discuss some implications of the binary's hardening process. When the more massive (primary) components of close binaries eject most their mass through supernova explosion, their secondary stars may attain a range of eccentricities and inclinations. Such processes may provide an alternative unified scenario for the origin of the kinematic properties of the central cluster and S-stars in the Galactic center as well as the high velocity stars in the Galactic halo.
description: 19 pages, 14 figures, accepted for publication in ApJ
Use of creep recovery protocol to measure static yield stress and structural rebuilding of fresh cement pastes
Creators: name: Qian, Ye
name: Kawashima, Shiho
Publisher: name: Columbia University
Year: 2016
Subjects: subject: Viscosity
subject: Materials--Creep--Testing
subject: Cement
subject: Civil engineering
subject: FOS: Civil engineering

description: In this study, a creep recovery shear rheological protocol was applied to fresh cement pastes. A viscosity bifurcation behavior was observed through applying a range of creep stresses. When applied stress is sufficiently low viscosity increases and the material yields, exhibiting viscoelastic solid-like behavior. Beyond a critical stress viscosity decreases and the material flows, exhibiting viscoelastic liquid-like behavior. Through examining this bifurcation behavior we found that the transition of viscosity occurs at very low strains. The strains at which this transition occurred were compared with critical strains measured through low amplitude oscillatory shear. Results provided support that the solid-liquid transition occurs beyond the critical stress measured through creep, thereby tying it to static yield stress. The protocol was implemented to probe pastes modified with attapulgite clays, a highly thixotropic system, and was found to be effective in characterizing static yield stress and thixotropic rebuilding.
Interviews zum Schwerpunkt mit Dr. Martin Fries und Dr. Florian Skupin
Creators: name: Handke, Yassin
name: Schur, Anne-Catherine
name: Schmidt, Diana
name: Handschug, Eik
Publisher: name: Bayreuther Zeitschrift für Rechtswissenschaft
Year: 2023

description: Für unseren Schwerpunkt haben wir zwei Interviews mit Dr. Martin Fries und Dr. Florian Skupin geführt. Sie haben mit uns z.B. über die Digitalisierung im Bezug auf Vertragstexte, Legal-Tech und den technischen Wandel in der Praxis gesprochen.
description: Bayreuther Zeitschrift für Rechtswissenschaft, Bd. 1 Nr. 5 (2023): 5. Ausgabe der Bayreuther Zeitschrift für Rechtswissenschaft (Schwerpunkt: Recht im Wandel)
Revealing the Angular Symmetry of Chemical Bonds by Atomic Force Microscopy
Creators: name: Welker, Joachim
name: Giessibl, Franz J.
Publisher: name: Universität Regensburg
Year: 2012
Subjects: subject: 530 Physik

description: We have measured the angular dependence of chemical bonding forces between a carbon monoxide molecule that is adsorbed to a copper surface and the terminal atom of the metallic tip of a combined scanning tunneling microscope and atomic force microscope. We provide tomographic maps of force and current as a function of distance that revealed the emergence of strongly directional chemical bonds as tip and sample approach. The force maps show pronounced single, dual, or triple minima depending on the orientation of the tip atom, whereas tunneling current maps showed a single minimum for all three tip conditions. We introduce an angular dependent model for the bonding energy that maps the observed experimental data for all observed orientations and distances.
Influence of Carbon Nanotube Clustering on Mechanical and Electrical Properties of Cement Pastes
Creators: name: Jang, Sung-Hwan
name: Kawashima, Shiho
name: Yin, Huiming
Publisher: name: Columbia University
Year: 2016
Subjects: subject: Cement
subject: Electric conductivity
subject: Materials--Mechanical properties
subject: Carbon nanotubes
subject: Civil engineering
subject: FOS: Civil engineering

description: Given the continued challenge of dispersion, for practical purposes, it is of interest to evaluate the impact of multi-walled carbon nanotubes (MWCNTs) at different states of clustering on the eventual performance properties of cement paste. This study evaluated the clustering of MWCNTs and the resultant effect on the mechanical and electrical properties when incorporated into cement paste. Cement pastes containing different concentrations of MWCNTs (up to 0.5% by mass of cement) with/without surfactant were characterized. MWCNT clustering was assessed qualitatively in an aqueous solution through visual observation, and quantitatively in cement matrices using a scanning electron microscopy technique. Additionally, the corresponding 28-day compressive strength, tensile strength, and electrical conductivity were measured. Results showed that the use of surfactant led to a downward shift in the MWCNT clustering size distribution in the matrices of MWCNT/cement paste, indicating improved dispersion of MWCNTs. The compressive strength, tensile strength, and electrical conductivity of the composites with surfactant increased with MWCNT concentration and were higher than those without surfactant at all concentrations.
title: THEORETICAL ASPECTS OF STUDYING ANTIMICROBIAL ACTIVITY OF NOVEL DERIVATIVES OF KHINAZOLIN-4 (3Н) - ONE WITH RESPECT TO P. MIRABILIS AND E. COLI
Creators: name: Starikova, Alla A.
name: Gabitova, Narmina M.
name: Samotrueva, Marina A.
Publisher: name: Astrakhan State Medical University
Year: 2021

description: The present review shows that Escherichia coli and Proteus mirabilis belonging to the Enterobacteri-aceae family, being the cause of human urinary tract infections, are characterized by the same factors of surface virulence, the ability to form biofilms, produce urease and α-hemolysin. Differing in the chemical composition of cell wall lipopolysarides, the functioning of quorum signaling systems, varie-ties of β-lactamases produced, the periodicity of «rowing» processes, invasive ability and tendency to interact with different types of cells make there no similarity in sensitivity to the action of antimicrobi-al drugs.Antimicrobial activity of quinazoline-4(3H)-ones substituted with azomethine group bound to benzene ring, nitro group, alcohol hydroxyl or covalent-bonded bromine atom, as well as heterocyclic radicals in relation to these pathogens is established. Ideas about the pharmacophoric activity of func-tional centers in the composition of various medicinal substances will allow modeling the structure of medicinal substances showing pharmacological effect against Escherichia coli and Proteus mirabilis. Keywords: urease, quinazoline-4(3H)-one, β-lactamases, quorum-signalling systems, antigenic determinant, Proteus mirabilis, Eschericihia coli, virulence factors, pharmacophore, autoinductors.
A new series for $π^3$ and related congruences
Creators: name: Sun, Zhi-Wei
Publisher: name: arXiv
Year: 2010
Subjects: subject: Number Theory (math.NT)
subject: Combinatorics (math.CO)
subject: FOS: Mathematics
subject: 11A07, 11B75, 05A10, 05A19, 11B68, 33E99

description: Let $H_n^{(2)}$ denote the second-order harmonic number $\sum_{03$, where $E_0,E_1,E_2,\ldots$ are Euler numbers. Motivated by the Amdeberhan-Zeilberger identity $\sum_{k=1}^\infty(21k-8)/(k^3\binom{2k}k^3)=π^2/6$, we also establish the congruence $$\sum_{k=1}^{(p-1)/2}\frac{21k-8}{k^3\binom{2k}k^3}\equiv(-1)^{(p+1)/2}4E_{p-3}\pmod p$$ for each prime $p>3$.
description: Final published version
A nudez feminina nas curvas do dispositivo: nosso corpo nos pertence?
Creators: name: Domingos, José
Publisher: name: figshare
Year: 2022
Subjects: subject: 200205 Culture, Gender, Sexuality
subject: FOS: Other humanities
subject: 200403 Discourse and Pragmatics
subject: FOS: Languages and literature

description: Neste artigo, recorremos às formulações foucaultianas em torno da ideia de dispositivo para refletirmos o lugar discursivo da nudez feminina na sociedade atual. Para, partimos das dimensões do tanto visível e do enunciável, próprio ao dispositivo de modo geral e que nos permita ver e falar do corpo [nu] feminino para tratarmos, de modo mais específico, do dispositivo da sexualidade. Pensaremos estes conceitos a partir de duas emergências enunciativas retiradas da produção discursiva-midiática contemporânea: a imagem de uma transexual “crucificada” na Parad a LGBT de São Paulo em 2015 e uma charge sobre protestos feministas.
Vorwort und Editorial zur 5. Ausgabe der BayZR
Creators: name: Herb, Johannes
name: Machalett, Lea
name: Groth, Helena
Publisher: name: Bayreuther Zeitschrift für Rechtswissenschaft
Year: 2023

description: Bayreuther Zeitschrift für Rechtswissenschaft, Bd. 1 Nr. 5 (2023): 5. Ausgabe der Bayreuther Zeitschrift für Rechtswissenschaft (Schwerpunkt: Recht im Wandel)
Inhaltsverzeichnis
Creators: name: Bayreuther Zeitschrift Für Rechtswissenschaft
Publisher: name: Bayreuther Zeitschrift für Rechtswissenschaft
Year: 2023

description: Hier finden Sie das Inhaltsverzeichnis der fünften Ausgabe der BayZR.
description: Bayreuther Zeitschrift für Rechtswissenschaft, Bd. 1 Nr. 5 (2023): 5. Ausgabe der Bayreuther Zeitschrift für Rechtswissenschaft (Schwerpunkt: Recht im Wandel)
Floquet spin states in graphene under ac driven spin-orbit interaction
Creators: name: Lopez, Alexander
name: Sun, Z. Z.
name: Schliemann, John
Publisher: name: Universität Regensburg
Year: 2012
Subjects: subject: 530 Physik

description: We study the role of periodically driven time-dependent Rashba spin-orbit coupling (RSOC) on a monolayer graphene sample. After recasting the originally $4\times 4$ system of dynamical equations as two time-reversal related two-level problems, the quasi-energy spectrum and the related dynamics are investigated via various techniques and approximations. In the static case the system is a gapped at the Dirac point. The rotating wave approximation (RWA) applied to the driven system unphysically preserves this feature, while the Magnus-Floquet approach as well as a numerically exact evaluation of the Floquet equation show that this gap is dynamically closed. In addition, a sizable oscillating pattern of the out-of-plane spin polarization is found in the driven case for states which completely unpolarized in the static limit. Evaluation of the autocorrelation function shows that the original uniform interference pattern corresponding to time-independent RSOC gets distorted. The resulting structure can be qualitatively explained as a consequence of the transitions induced by the ac driving among the static eigenstates, i.e., these transitions modulate the relative phases that add up to give the quantum revivals of the autocorrelation function. Contrary to the static case, in the driven scenario, quantum revivals (suppresions) are correlated to spin up (down) phases.
Characterization of Cement-Based Materials Modified with Graphene-Oxide
Creators: name: Qian, Ye
name: Abdallah, Maika Yzabelle
name: Kawashima, Shiho
Publisher: name: Columbia University
Year: 2015
Subjects: subject: Cement
subject: Concrete
subject: Nanostructured materials
subject: Civil engineering
subject: FOS: Civil engineering

description: For applications in cement and concrete, studies on carbon-based nanomaterials have been almost exclusively on carbon nanotubes, even constituting a large portion of studies on nanomaterials of any type. Although a promising approach, economic and dispersion issues continue to limit industry acceptance. Graphene oxide (GO), derived cost-effectively from graphite, shows good dispersion in water. In this paper, preliminary results showing the beneficial effects of graphene oxide on the hardening and mechanical properties of cement-based materials are presented.
An incidence theorem in higher dimensions
Creators: name: Solymosi, Jozsef
name: Tao, Terence
Publisher: name: arXiv
Year: 2011
Subjects: subject: Combinatorics (math.CO)
subject: Algebraic Geometry (math.AG)
subject: FOS: Mathematics
subject: 52C10, 32S22

description: We prove almost tight bounds on incidences between points and $k$-dimensional varieties of bounded degree in $\R^d$. Our main tools are the Polynomial Ham Sandwich Theorem and induction on both the dimension and the number of points.
description: 26 pages, no figures. A gap in the proof of Proposition 4.4 has been repaired
220+ Law and Economics Professors Sign Letter Opposing ISDS in the TPP
Creators: name: (:Unav)
Publisher: name: Columbia University
Year: 2016
Subjects: subject: Investments, Foreign--Government policy
subject: Investments, Foreign--Law and legislation
subject: Investments, Foreign (International law)
subject: Treaties
subject: Pacific settlement of international disputes
subject: Sustainable development
subject: Law
subject: FOS: Law
subject: Sustainability

description: CCSI helped launch a letter joined by over 220 law and economics professors calling on Congress to oppose the final Trans-Pacific Partnership agreement because that treaty includes the investor-state dispute settlement (ISDS) mechanism. As the letter notes, the ISDS mechanism “threatens to dilute constitutional protections, weaken the judicial branch and outsource our domestic legal system to a system of private arbitration that is isolated from essential checks and balances.” Despite the Obama administration’s claims to have addressed growing concerns about the ISDS system, the final TPP would instead vastly expand the ISDS threat to the rule of law and U.S. democratic institutions.
Building teacher resilience : relations of self-compassion among teacher efficacy and burnout
Creators: name: Sauve, Julie Ann
Publisher: name: University of British Columbia
Year: 2017

description: Teacher burnout is a phenomenon that has received a considerable amount of research. There is good reason for this, given that growing rates of teacher burnout are associated with many negative consequences including a reduction in teacher quality and increased costs due to high teacher turnover rates. Emerging research indicates that strengthening teachers’ social and emotional competencies (SEC) may lower burnout while promoting feelings of well-being and resilience. The aim of this study was to add to the body of current research focused on investigating teacher SEC and burnout by examining self-compassion, a promising, yet currently under researched SEC, in relation to other teacher characteristics known to be associated with burnout. Specifically, the present study assessed relations among self-compassion, teacher efficacy, and years of teaching experience to burnout by analyzing the self-reported responses of 52 elementary and secondary teachers to a teacher health and well-being questionnaire. Along with the use of correlational analysis, three multiple regression models were used to examine relations among self-compassion, teacher efficacy, and years of teaching experience to each of the three dimensions of burnout: emotional exhaustion, depersonalization, and personal accomplishment. Additionally, the hierarchy of importance of each variable to each dimension of burnout was measured using the Pratt-index. As hypothesized, self-compassion was significantly associated with all three dimensions of burnout, and was measured to be the variable of greatest importance for the dimensions of emotional exhaustion and depersonalization. Teacher efficacy was only significantly associated with, and found to be relatively important to one dimension of burnout: personal accomplishment. When examined collectively, self-compassion, teacher efficacy, and years of teaching experience moderately predicted personal accomplishment, but failed to significantly predict emotional exhaustion or depersonalization. Findings from this study suggest that efforts to diminish teacher burnout require development of multiple competencies that address the multidimensional aspect of burnout. Self-compassion warrants further examination as a potential competency that may serve to assist in such efforts.
A Novel Approach Towards Cost Effective Region-Based Group Key Agreement Protocol for Peer - to - Peer Information Sharing in Mobile Ad Hoc Networks
Creators: name: Kumar, K.
name: Begum, J. Nafeesa
name: Sumathy, V.
Publisher: name: arXiv
Year: 2010
Subjects: subject: Cryptography and Security (cs.CR)
subject: FOS: Computer and information sciences

description: Peer-to-peer systems have gained a lot of attention as information sharing systems for the widespread exchange of resources and voluminous information that is easily accessible among thousands of users. However, current peer-to-peer information sharing systems work mostly on wired networks. With the growing number of communication-equipped mobile devices that can self-organize into infrastructure-less communication platform, namely mobile ad hoc networks (MANETs), peer-to-peer information sharing over MANETs becomes a promising research area. In this paper, we propose a Region-Based structure that enables efficient and secure peer-to-peer information sharing over MANETs. The implementation shows that the proposed scheme is Secure, scalable, efficient, and adaptive to node mobility and provides Reliable information sharing.
description: 19 pages
Hyperfine induced electron spin and entanglement dynamics in double quantum dots: The case of separate baths
Creators: name: Erbe, Björn
name: Schliemann, John
Publisher: name: Universität Regensburg
Year: 2012
Subjects: subject: 530 Physik

description: We consider a system of two strongly coupled electron spins in zero magnetic field, each of which is interacting with an individual bath of nuclear spins via the hyperfine interaction. Applying the long-spin approximation that we introduced in a previous paper [ Europhys. Lett. 95 47009 (2011)] (here each bath is replaced by a single long spin), we numerically study the electron spin and entanglement dynamics. We demonstrate that the decoherence time is scaling with the bath size according to a power law. As expected, the decaying part of the dynamics decreases with increasing bath polarization. However, surprisingly it turns out that, under certain circumstances, combining quantum dots of different geometry to the double dot setup has a very similar effect on the magnitude of the spin decay. Finally, we show that even for a comparatively weak exchange coupling the electron spins can be fully entangled.
It contains the data of qPCR, Western Blot, and other results.
Creators: name: Xiao, Fei
name: Wang, Zidan
name: Cheng, Ke
name: Xing, Haiyuan
name: Lei, Tianrun
name: Wang, Junwen
Publisher: name: figshare
Year: 2025
Subjects: classificationCode: 320501
subject: Medical biochemistry - amino acids and metabolites
classificationCode: 320505
subject: Medical biochemistry - nucleic acids
classificationCode: 320506
subject: Medical biochemistry - proteins and peptides (incl. medical proteomics)

description: It contains the data of qPCR, Western Blot, and other results.
AP/Ipsos-Public Affairs Poll # 2003-1201: Politics and Personal Finances
Creators: name: Associated Press
Publisher: name: Roper Center for Public Opinion Research
Year: 2005

description: Direction of country (1); George W. Bush job performance (8); re-elect George W. Bush in 2004 (2); economy (2); personal finances (2); comfort in making major purchases (2); job security (1); investing in the future (1); job loss due to economic conditions (2).
Memo to the Obama Administration on the Burma Responsible Investment Reporting Requirements
Creators: name: Sachs, Lisa E.
name: Cordes, Kaitlin Y.
Publisher: name: Columbia University
Year: 2013
Subjects: subject: Investments, Foreign--Government policy
subject: Sustainable development
subject: Investments, Foreign
subject: Investments, Foreign--Law and legislation
subject: Investments, Foreign (International law)
subject: Treaties
subject: Law
subject: FOS: Law
subject: Sustainability

description: In September 2013, CCSI sent a memo to President Obama and his Administration in response to the first public reports submitted by U.S. companies in compliance with the Burma Responsible Investment Reporting Requirements. The memo applauded the U.S. Government’s efforts to encourage responsible investment in Burma, noting that robust due diligence is essential to ensuring that international investments contribute to sustainable development. Yet the memo also urged the Obama Administration to take steps to strengthen future reporting. In particular, CCSI urged the Administration to issue clarifying guidance that any U.S. investor submitting a report should (1) provide information on due diligence policies and procedures related to land rights, and (2) provide thorough information in response to each reporting question, regardless of whether its investments are “passive.”
Memo to the Obama Administration on “Improving the International Investment Regime”
Creators: name: (:Unav)
Publisher: name: Columbia University
Year: 2009
Subjects: subject: Investments, Foreign--Government policy
subject: Investments, Foreign--Law and legislation
subject: Investments, Foreign (International law)
subject: Sustainable development
subject: Law
subject: FOS: Law
subject: Sustainability

description: In January 2009, CCSI sent a Memo to President Obama’s Administration on “Improving the international investment regime.” The Memo encourages the new Administration to take a look at the current international investment regime and consider several actions that the United States might take to strengthen that regime. A number of these ideas are already on the table, and the new Administration will have to be prepared, in one way or another, to deal with them. Several eminent colleagues at Columbia University signed on to the Memo.
1.1. Flow cytometry for Rat bone marrow mesenchymal stem cells (BMSCs) .xls
Creators: name: Wang, Zidan
Publisher: name: figshare
Year: 2025
Subjects: classificationCode: 320501
subject: Medical biochemistry - amino acids and metabolites
classificationCode: 320505
subject: Medical biochemistry - nucleic acids
classificationCode: 320506
subject: Medical biochemistry - proteins and peptides (incl. medical proteomics)

description: After cells were resuspended with 100 μl PBS, 2 μl HECA452 antibody was added to cells and incubated for 30 min at 4℃ without light. The supernatant was washed once with 2 ml PBS, and centrifuged at 400g for 5 min at 4℃. Cells were resuspended with 400 ml PBS and analyzed by NovoCyte software.Cells were washed once with 2 ml PBS, and centrifuged at 400g for 5 min at 4℃. After the supernatant was discarded, cells were fixed with 1 ml 4% paraformaldehyde for 30 min at room temperature. 200 μl CD15s antibody (diluted 1:500) was added to cells and incubated for 1h at room temperature. After being washed twice with PBS, 200 μl secondary antibody (diluted 1:200) was added and incubated for 1h at 37℃. Cells were washed twice with PBS, resuspended with 400 μl PBS, and stored at 4℃ without light.
Специфика организации религиозных и паломнических поездок
Creators: name: БОРИСЕНКО Ирина Вячеславовна
Publisher: name: Сервис plus
Year: 2019
Subjects: туризм
религиозный туризм
паломничество
паломнические службы

description: Актуальность статьи связана со спецификой организации религиозных и паломнических поез-док. Эта специфика определена не только особыми потребностями туристов (паломников), путешествующих с религиозными целями. Знаковое отличие современного этапа развития религиозного туризма – высокая вовле-ченность различных организаторов религиозных и паломнических поездок. В статье впервые предпринята по-пытка обобщения и классификации организаторов религиозного туризма в России, пояснена их роль и функции на рынке религиозного туризма. Так же в статье рассмотрена тема законодательного регулирования организации паломнических поездок религиозными организациями, которые не относятся к туристским операторам и агентам, при этом разрабатывают и предлагают, по сути, туристский продукт. Представлены виды паломнических служб, дана их характеристика. В заключении определены причины, по которым подавляющее большинство духовных паломников предпочитают пользоваться услугами нетуристских организаторов. Представленные выводы и обоб-щения могут помочь туристским организациям в формировании и продвижении религиозного туристского про-дукта.
Considerations for EAGLE from Monte-Carlo adaptive optics simulation
Creators: name: Basden, Alastair
name: Butterley, Timothy
name: Myers, Richard
Publisher: name: arXiv
Year: 2010
Subjects: subject: Instrumentation and Methods for Astrophysics (astro-ph.IM)
subject: Optics (physics.optics)
subject: FOS: Physical sciences

description: The EAGLE instrument for the E-ELT is a multi-IFU spectrograph, that uses a MOAO system for wavefront correction of interesting lines of sight. We present a Monte-Carlo AO simulation package that has been used to model the performace of EAGLE, and provide results, including comparisons with an analytical code. These results include an investigation of the performance of compressed reconstructor representations that have the potential to significantly reduce the complexity of a real-time control system when implemented.
description: 34 pages, 10 figures at end, accepted by Applied Optics