cometadata/datacite-rtg-text-other-reclassification-records huggingface dataset:
On the use of topological features and hierarchical characterization for disambiguating names in collaborative networks
Creators: name: Amancio, Diego R.
name: Oliveira, Osvaldo N.
name: Costa, Luciano da F.
Publisher: name: arXiv
Year: 2013
Subjects: subject: Physics and Society (physics.soc-ph)
subject: Digital Libraries (cs.DL)
subject: Information Retrieval (cs.IR)
subject: Social and Information Networks (cs.SI)
subject: FOS: Physical sciences
subject: FOS: Computer and information sciences

description: Many features of complex systems can now be unveiled by applying statistical physics methods to treat them as social networks. The power of the analysis may be limited, however, by the presence of ambiguity in names, e.g., caused by homonymy in collaborative networks. In this paper we show that the ability to distinguish between homonymous authors is enhanced when longer-distance connections are considered, rather than looking at only the immediate neighbors of a node in the collaborative network. Optimized results were obtained upon using the 3rd hierarchy in connections. Furthermore, reasonable distinction among authors could also be achieved upon using pattern recognition strategies for the data generated from the topology of the collaborative network. These results were obtained with a network from papers in the arXiv repository, into which homonymy was deliberately introduced to test the methods with a controlled, reliable dataset. In all cases, several methods of supervised and unsupervised machine learning were used, leading to the same overall results. The suitability of using deeper hierarchies and network topology was confirmed with a real database of movie actors, with the additional finding that the distinguishing ability can be further enhanced by combining topology features and long-range connections in the collaborative network.
title: Тракт формирования управляющего сигнала голографической системы автоматического регулирования усиления и его моделирование
Creators: name: ., Д.Д. Габриэльян – Засл. деятель науки РФ, д.т.н., профессор, зам. руководителя НТК по науке, ФГУП «РНИИРС» ФНПЦ В.И. Демченко – к.т.н., руководитель НТК, ФГУП «РНИИРС» ФНПЦ С.В. Караваев – начальник лаборатории, ФГУП «РНИИРС» ФНПЦ Н.А. Михайлов – к.т.н., начальник сектора, ФГУП «РНИИРС» ФНПЦ А.Г. Прыгунов – к.т.н., доцент, ст. науч. сотрудник, ФГУП «РНИИРС» ФНПЦ
Publisher: name: Издательство Радиотехника
Year: 2019

description: Постановка проблемы. Уровень входного сигнала радиоприемника может изменяться случайным образом в очень больших пределах до 120 дБ. Для компенсации изменения уровня сигнала в приемном тракте используется автоматическая регулировка усиления (APУ). Актуальной является задача расширения динамического диапазона работы системы АРУ сигнала, повышения быстродействия ее работы и снижения влияния шумов на работу этой системы.
Цель. Провести исследование тракта формирования управляющего сигнала голографической системы АРУ, включая построение структурной схемы, обоснование принципа работы и проведение математического моделирования для разработки рекомендации по выбору параметров устройств и элементов в составе тракта.
Результаты. Предложенный вариант построения тракта формирования управляющего сигнала в системе АРУ с обратным регулированием позволяет: расширить динамический диапазон формируемого управляющего сигнала и, соответственно, АРУ до 150 дБ и более; повысить быстродействие системы АРУ не менее чем в 10 раз, что дает возможность компенсировать изменения уровня принимаемого радиосигнала, вызванные воздействием дестабилизирующих факторов с длительностью менее 0,1 мс, и, соответственно, обеспечить устойчивую обработку при передаче информации со скоростью более 1 Гбит/с.
Практическая значимость. Предложенное в составе тракта голографическое устройство может быть использовано не только для выполнения различных операций при обработке радиосигналов, включая демодуляцию радио- и оптических сигналов, а также для решения измерительных задач оптической локации.
Rooftop rainwater harvesting for Mombasa: Scenario development with image classification and water resources simulation
Creators: name: Ojwang, Robert O.
name: Dietrich, Jörg
name: Anebagilu, Prajna Kasargodu
name: Beyer, Matthias
name: Rottensteiner, Franz
Publisher: name: Basel : MDPI AG
Year: 2017
Subjects: subject: Integrated water resources management
subject: Mombasa
subject: Roof rainwater harvesting
subject: Water demand
subject: Water supply
subject: WEAP
subject: Climate change
subject: Economics
subject: Harvesting
subject: Image classification
subject: Population statistics
subject: Rain
subject: Roofs
subject: Integrated Water Resources Management
subject: Rain water harvesting
subject: Water resources
subject: Dewey Decimal Classification::300 | Sozialwissenschaften, Soziologie, Anthropologie::330 | Wirtschaft::333 | Boden- und Energiewirtschaft::333,7 | Natürliche Ressourcen, Energie und Umwelt

description: Mombasa faces severe water scarcity problems. The existing supply is unable to satisfy the demand. This article demonstrates the combination of satellite image analysis and modelling as tools for the development of an urban rainwater harvesting policy. For developing a sustainable remedy policy, rooftop rainwater harvesting (RRWH) strategies were implemented into the water supply and demand model WEAP (Water Evaluation and Planning System). Roof areas were detected using supervised image classification. Future population growth, improved living standards, and climate change predictions until 2035 were combined with four management strategies. Image classification techniques were able to detect roof areas with acceptable accuracy. The simulated annual yield of RRWH ranged from 2.3 to 23 million cubic meters (MCM) depending on the extent of the roof area. Apart from potential RRWH, additional sources of water are required for full demand coverage. © 2017 by the authors.
The fine structure of the finite-size effects for the spectrum of the OSp(n|2m) spin chain
Creators: name: Frahm, Holger
name: Martins, Márcio J.
Publisher: name: Amsterdam : Elsevier B.V.
Year: 2018
Subjects: subject: Osp(n|2m)
subject: quantum spin chain
subject: superalgebra
subject: nuclear physics
subject: Dewey Decimal Classification::500 | Naturwissenschaften::530 | Physik

description: In this paper we investigate the finite-size properties of the spectrum of quantum spin chains with local spins taken to be the fundamental vector representation of the OSp(n|2m) superalgebra. © 2018 The Author(s)
A superheated Bose-condensed gas
Creators: name: Gaunt, Alexander L.
name: Fletcher, Richard J.
name: Smith, Robert P.
name: Hadzibabic, Zoran
Publisher: name: arXiv
Year: 2012
Subjects: subject: Quantum Gases (cond-mat.quant-gas)
subject: Statistical Mechanics (cond-mat.stat-mech)
subject: Atomic Physics (physics.atom-ph)
subject: Quantum Physics (quant-ph)
subject: FOS: Physical sciences

description: Our understanding of various states of matter usually relies on the assumption of thermodynamic equilibrium. However, the transitions between different phases of matter can be strongly affected by non-equilibrium phenomena. Here we demonstrate and explain an example of non-equilibrium stalling of a continuous, second-order phase transition. We create a superheated atomic Bose gas, in which a Bose-Einstein condensate (BEC) persists above the equilibrium critical temperature, $T_c$, if its coupling to the surrounding thermal bath is reduced by tuning interatomic interactions. For vanishing interactions the BEC persists in the superheated regime for a minute. However, if strong interactions are suddenly turned on, it rapidly "boils" away. Our observations can be understood within a two-fluid picture, treating the condensed and thermal components of the gas as separate equilibrium systems with a tuneable inter-component coupling. We experimentally reconstruct a non-equilibrium phase diagram of our gas, and theoretically reproduce its main features.
description: 4.2 pages, 4 figures + 4 pages, 3 figures of supplementary information
No temperature fluctuations in the giant HII region H 1013
Creators: name: Stasinska, G.
name: Morisset, C.
name: Simon-Diaz, S.
name: Bresolin, F.
name: Schaerer, D.
name: Brandl, B.
Publisher: name: arXiv
Year: 2013
Subjects: subject: Cosmology and Nongalactic Astrophysics (astro-ph.CO)
subject: FOS: Physical sciences

description: While collisionally excited lines in HII regions allow one to easily probe the chemical composition of the interstellar medium in galaxies, the possible presence of important temperature fluctuations casts some doubt on the derived abundances. To provide new insights into this question, we have carried out a detailed study of a giant HII region, H 1013, located in the galaxy M101, for which many observational data exist and which has been claimed to harbour temperature fluctuations at a level of t^2 = 0.03-0.06. We have first complemented the already available optical observational datasets with a mid-infrared spectrum obtained with the Spitzer Space Telescope. Combined with optical data, this spectrum provides unprecedented information on the temperature structure of this giant HII region. A preliminary analysis based on empirical temperature diagnostics suggests that temperature fluctuations should be quite weak. We have then performed a detailed modelling using the pyCloudy package based on the photoionization code Cloudy. We have been able to produce photoionization models constrained by the observed Hb surface brightness distribution and by the known properties of the ionizing stellar population than can account for most of the line ratios within their uncertainties. Since the observational constraints are both strong and numerous, this argues against the presence of significant temperature fluctuations in H 1013. The oxygen abundance of our best model is 12 + log O/H = 8.57, as opposed to the values of 8.73 and 8.93 advocated by Esteban et al. (2009) and Bresolin (2007), respectively, based on the significant temperature fluctuations they derived. However, our model is not able to reproduce the intensities of the oxygen recombination lines . This cannot be attributed to observational uncertainties and requires an explanation other than temperature fluctuations.
description: accepted in Astronomy & Astrophysics
Inversion by Direct Iteration: An Alternative to Denoising Diffusion for Image Restoration
Creators: name: Delbracio, Mauricio
name: Milanfar, Peyman
Publisher: name: arXiv
Year: 2023
Subjects: subject: Image and Video Processing (eess.IV)
subject: Computer Vision and Pattern Recognition (cs.CV)
subject: Machine Learning (cs.LG)
subject: FOS: Electrical engineering, electronic engineering, information engineering
subject: FOS: Computer and information sciences

description: Inversion by Direct Iteration (InDI) is a new formulation for supervised image restoration that avoids the so-called "regression to the mean" effect and produces more realistic and detailed images than existing regression-based methods. It does this by gradually improving image quality in small steps, similar to generative denoising diffusion models. Image restoration is an ill-posed problem where multiple high-quality images are plausible reconstructions of a given low-quality input. Therefore, the outcome of a single step regression model is typically an aggregate of all possible explanations, therefore lacking details and realism. The main advantage of InDI is that it does not try to predict the clean target image in a single step but instead gradually improves the image in small steps, resulting in better perceptual quality. While generative denoising diffusion models also work in small steps, our formulation is distinct in that it does not require knowledge of any analytic form of the degradation process. Instead, we directly learn an iterative restoration process from low-quality and high-quality paired examples. InDI can be applied to virtually any image degradation, given paired training data. In conditional denoising diffusion image restoration the denoising network generates the restored image by repeatedly denoising an initial image of pure noise, conditioned on the degraded input. Contrary to conditional denoising formulations, InDI directly proceeds by iteratively restoring the input low-quality image, producing high-quality results on a variety of image restoration tasks, including motion and out-of-focus deblurring, super-resolution, compression artifact removal, and denoising.
Coupling of two Dirac particles
Creators: name: Berman, O. L.
name: Kezerashvili, R. Ya.
name: Ziegler, K.
Publisher: name: arXiv
Year: 2013
Subjects: subject: Mesoscale and Nanoscale Physics (cond-mat.mes-hall)
subject: Quantum Physics (quant-ph)
subject: FOS: Physical sciences

description: A study of the formation of excitons as a problem of two Dirac particles in a gapped graphene layer and in two gapped graphene layers separated by a dielectric is presented. In the low energy limit the separation of the center-of-mass and relative motions is obtained. Analytical solutions for the wave function and energy dispersion for both cases when electron and hole interact via a Coulomb potential are found. It is shown that the energy spectrum and the effective exciton mass are functions of the energy gaps as well as interlayer separation in case of two layer gapped graphene.
description: 12 pages, 7 figures. arXiv admin note: substantial text overlap with arXiv:1110.6744
Study of storm weather situations in observation and ECHAM3/T42 model simulation
Creators: name: Busch, U.
name: Beckmann, B.R.
name: Roth, R.
Publisher: name: Copenhagen : Munksgaard Int. Publ. Ltd.
Year: 1998
Subjects: subject: climate
subject: time
subject: gcm
subject: Dewey Decimal Classification::500 | Naturwissenschaften::550 | Geowissenschaften

description: In this paper, we provide an estimation of the seasonal distribution of strong wind and storm weather situations in an ECHAM3/T42 climate model simulation in relation to observed conditions. Observational data of the German Eight and the southern Baltic Sea are taken to compare observations and climate model simulation. The results of the study show significant differences in the seasonal Frequency of occurrence for strong wind and storm weather situations between simulation and observations. A new objective classification routine for detecting single strong wind and storm weather situations (Bft 7 and more) in coarse resolution models is used to validate the large-scale parameters of those events in the climate simulation. The objective classification routine is able to detect strong wind and storm weather situations of two flow regimes in the German Eight in winter. The routine is applied to the ECMWF Re-Analysis (T42 resolution) and to a climate simulation of the northern Hemisphere, which was performed with the ECHAM3/T42. It is shown that the large-scale parameters of single strong wind and storm weather situations are simulated quire realistically in the ECHAM3/T42.
Unveiling the complex glassy dynamics of square shoulder systems: simulations and theory
Creators: name: Das, Gayatri
name: Gnan, Nicoletta
name: Sciortino, Francesco
name: Zaccarelli, Emanuela
Publisher: name: arXiv
Year: 2013
Subjects: subject: Soft Condensed Matter (cond-mat.soft)
subject: FOS: Physical sciences

description: We performed extensive molecular dynamics (MD) simulations, supplemented by Mode Coupling Theory (MCT) calculations, for the Square Shoulder (SS) model, a purely repulsive potential where the hard-core is complemented by a finite shoulder. For the one-component version of this model, MCT predicted [Sperl {\it et al.} Phys. Rev. Lett. {\bf 104}, 145701 (2010)] the presence of diffusion anomalies both upon cooling and upon compression and the occurrence of glass-glass transitions. In the simulations, we focus on a non-crystallising binary mixture, which, at the investigated shoulder width, shows a non-monotonic behaviour of the diffusion upon cooling but not upon isothermal compression. In addition, we find the presence of a disconnected glass-glass line in the phase diagram, ending in two higher-order singularities. These points generate a logarithmic dependence of the density correlators as well as a subdiffusive behaviour of the mean squared displacement, although with the interference of the nearby liquid-glass transition. We also perform novel MCT calculations using as input the partial structure factors obtained within MD, confirming the simulation results. The presence of two hard sphere glasses, differing only in their hard core length, is revealed, showing that the simple competition between the two is sufficient for creating a rather complex dynamical behaviour.
UM 625 Revisited: Multiwavelength Study of A Seyfert 1 Galaxy with a Low-mass Black Hole
Creators: name: Jiang, Ning
name: Ho, Luis C.
name: Dong, Xiao-bo
name: Yang, Huan
name: Wang, Junxian
Publisher: name: arXiv
Year: 2013
Subjects: subject: Astrophysics of Galaxies (astro-ph.GA)
subject: Cosmology and Nongalactic Astrophysics (astro-ph.CO)
subject: FOS: Physical sciences

description: UM 625, previously identified as a narrow-line active galactic nucleus (AGN), actually exhibits broad \ha\ and \hb\ lines whose width and luminosity indicate a low black hole mass of $1.6 \times 10^6$ \msun. We present a detailed multiwavelength study of the nuclear and host galaxy properties of UM 625. Analysis of \chandra\ and \xmm\ observations suggests that this system contains a heavily absorbed and intrinsically X-ray weak ($\aox=-1.72$) nucleus. Although not strong enough to qualify as radio-loud, UM 625 does belong to a minority of low-mass AGNs detected in the radio. The broad-band spectral energy distribution constrains the bolometric luminosity to $\lbol\approx(0.5-3)\times10^{43}$ \lum\ and $\lratio\approx0.02-0.15$. A comprehensive analysis of Sloan Digital Sky Survey and {\it Hubble Space Telescope}\ images shows that UM 625 is a nearly face-on S0 galaxy with a prominent, relatively blue pseudobulge (\sersic\ index $n = 1.60$) that accounts for $\sim$60% of the total light in the $R$ band. The extended disk is featureless, but the central $\sim150-400$ pc contains a conspicuous semi-ring of bright, blue star-forming knots, whose integrated ultraviolet luminosity suggests a star formation rate of $\sim$0.3 \msun yr$^{-1}$. The mass of the central black hole roughly agrees with the value predicted from its bulge velocity dispersion but is significantly lower than that expected from its bulge luminosity.
description: Accepted for publication by ApJ; 13 pages, 2 tables and 7 figures
Toric extremal Kähler-Ricci solitons are kähler-Einstein
Creators: name: Calamai, Simone
name: Petrecca, David
Publisher: name: Warsaw : De Gruyter Open Ltd.
Year: 2017
Subjects: subject: Einstein manifolds
subject: Extremal kähler metrics
subject: Kähler-ricci solitons
subject: Toric manifolds
subject: Dewey Decimal Classification::500 | Naturwissenschaften::510 | Mathematik

description: In this short note, we prove that a Calabi extremal Kähler-Ricci soliton on a compact toric Kähler manifold is Einstein. This settles for the class of toric manifolds a general problem stated by the authors that they solved only under some curvature assumptions. © 2017 Calamai and Petrecca, published by De Gruyter Open.
Carex parviflora Cav.
Creators: name: Becherer
Publisher: name: Zenodo
Year: 1956
Subjects: Biodiversity
Taxonomy

description: G. parviflora Cav. Eingeschleppt, sich einbürgernd. 2:Varen(Mantz1927);Niedergampel(Thommen1949).- 3:SustenundBahnhofLeuk(Becherer 1941); Resti unterhalb Eisten (Saastal), Kartoffelacker (Hirschmann 1953); Brig, Bahnhofund Ort (Christ 1919,Thommen, Zwickyu. a.).
description: Published as part of Becherer, 1956, Florae Vallesiacae Supplementum, pp. 1-556 in Denkschriften der Schweizerischen Naturforschenden Gesellschaft 71 on pages 1-556
HybridMIM: A Hybrid Masked Image Modeling Framework for 3D Medical Image Segmentation
Creators: name: Xing, Zhaohu
name: Zhu, Lei
name: Yu, Lequan
name: Xing, Zhiheng
name: Wan, Liang
Publisher: name: arXiv
Year: 2023
Subjects: subject: Computer Vision and Pattern Recognition (cs.CV)
subject: FOS: Computer and information sciences

description: Masked image modeling (MIM) with transformer backbones has recently been exploited as a powerful self-supervised pre-training technique. The existing MIM methods adopt the strategy to mask random patches of the image and reconstruct the missing pixels, which only considers semantic information at a lower level, and causes a long pre-training time.This paper presents HybridMIM, a novel hybrid self-supervised learning method based on masked image modeling for 3D medical image segmentation.Specifically, we design a two-level masking hierarchy to specify which and how patches in sub-volumes are masked, effectively providing the constraints of higher level semantic information. Then we learn the semantic information of medical images at three levels, including:1) partial region prediction to reconstruct key contents of the 3D image, which largely reduces the pre-training time burden (pixel-level); 2) patch-masking perception to learn the spatial relationship between the patches in each sub-volume (region-level).and 3) drop-out-based contrastive learning between samples within a mini-batch, which further improves the generalization ability of the framework (sample-level). The proposed framework is versatile to support both CNN and transformer as encoder backbones, and also enables to pre-train decoders for image segmentation. We conduct comprehensive experiments on four widely-used public medical image segmentation datasets, including BraTS2020, BTCV, MSD Liver, and MSD Spleen. The experimental results show the clear superiority of HybridMIM against competing supervised methods, masked pre-training approaches, and other self-supervised methods, in terms of quantitative metrics, timing performance and qualitative observations. The codes of HybridMIM are available at https://github.com/ge-xing/HybridMIM
description: 10 pages, submitted to TMI
Gender homophily from spatial behavior in a primary school: a sociometric study
Creators: name: Stehlé, J.
name: Charbonnier, F.
name: Picard, T.
name: Cattuto, C.
name: Barrat, A.
Publisher: name: arXiv
Year: 2013
Subjects: subject: Physics and Society (physics.soc-ph)
subject: Social and Information Networks (cs.SI)
subject: FOS: Physical sciences
subject: FOS: Computer and information sciences

description: We investigate gender homophily in the spatial proximity of children (6 to 12 years old) in a French primary school, using time-resolved data on face-to-face proximity recorded by means of wearable sensors. For strong ties, i.e., for pairs of children who interact more than a defined threshold, we find statistical evidence of gender preference that increases with grade. For weak ties, conversely, gender homophily is negatively correlated with grade for girls, and positively correlated with grade for boys. This different evolution with grade of weak and strong ties exposes a contrasted picture of gender homophily.
Enabling Self-Powered Autonomous Wireless Sensors with New-Generation I2C-RFID Chips
Creators: name: De Donno, D.
name: Catarinucci, L.
name: Tarricone, L.
Publisher: name: arXiv
Year: 2013
Subjects: subject: Other Computer Science (cs.OH)
subject: FOS: Computer and information sciences

description: A self-powered autonomous RFID device with sensing and computing capabilities is presented in this paper. Powered by an RF energy-harvesting circuit enhanced by a DC-DC voltage booster in silicon-on-insulator (SOI) technology, the device relies on a microcontroller and a new generation I2C-RFID chip to wirelessly deliver sensor data to standard RFID EPC Class-1 Generation-2 (Gen2) readers. When the RF power received from the interrogating reader is -14 dBm or higher, the device, fabricated on an FR4 substrate using low-cost discrete components, is able to produce 2.4-V DC voltage to power its circuitry. The experimental results demonstrate the effectiveness of the device to perform reliable sensor data transmissions up to 5 meters in fully-passive mode. To the best of our knowledge, this represents the longest read range ever reported for passive UHF RFID sensors compliant with the EPC Gen2 standard.
Uncertainty relations for angular momentum
Creators: name: Dammeier, Lars
name: Schwonnek, René
name: Werner, Reinhard F.
Publisher: name: Bristol : Institute of Physics Publishing
Year: 2015
Subjects: subject: Angular momentum
subject: Momentum
subject: Quantum theory
subject: Classical probabilities
subject: Measurement uncertainty
subject: Optimal lower bound
subject: Optimal measurements
subject: Output vectors
subject: State-dependent
subject: Uncertainty regions
subject: Uncertainty relation
subject: Uncertainty analysis
subject: angular momentum
subject: quantum mechanics
subject: uncertainty relations
subject: Dewey Decimal Classification::500 | Naturwissenschaften::530 | Physik

description: In this work we study various notions of uncertainty for angular momentum in the spin-s representation of SU(2). We characterize the 'uncertainty regions' given by all vectors, whose components are specified by the variances of the three angular momentum components. A basic feature of this set is a lower bound for the sum of the three variances. We give a method for obtaining optimal lower bounds for uncertainty regions for general operator triples, and evaluate these for small s. Further lower bounds are derived by generalizing the technique by which Robertson obtained his state-dependent lower bound. These are optimal for large s, since they are saturated by states taken from the Holstein-Primakoff approximation. We show that, for all s, all variances are consistent with the so-called vector model, i.e., they can also be realized by a classical probability measure on a sphere of radius Entropic uncertainty relations can be discussed similarly, but are minimized by different states than those minimizing the variances for small s. For large s the Maassen-Uffink bound becomes sharp and we explicitly describe the extremalizing states. Measurement uncertainty, as recently discussed by Busch, Lahti and Werner for position and momentum, is introduced and a generalized observable (POVM) which minimizes the worst case measurement uncertainty of all angular momentum components is explicitly determined, along with the minimal uncertainty.
Suppression and Control of Bipolar Powder Charging by Turbulence
Creators: name: Jantač, Simon
name: Grosshans, Holger
Publisher: name: arXiv
Year: 2023
Subjects: subject: Fluid Dynamics (physics.flu-dyn)
subject: FOS: Physical sciences

description: Current models predict particles of the same material but different sizes to charge bipolar upon contacts; the resulting charge peaks endanger process safety. However, we found wall-bounded turbulence to suppress the powder's electrostatic charging. Aerodynamic forces skew the collision frequency and narrow the charge distribution's bandwidth. Bipolar charging reduces, especially in moderately polydisperse systems of a low Stokes number. Not the smallest but mid-sized particles charge most negatively. Moreover, turbulence separates charge, producing pockets of high electric potential in low-vorticity regions.
description: 6 pages, 3 figures
Terahertz detectors based on graphene
Creators: name: Gouider, Fathi
name: Salman, Majdi
name: Göthlich, Markus
name: Schmidt, Hennrik
name: Ahlers, Franz-J.
name: Haug, Rolf J.
name: Nachtwei, Georg
Publisher: name: Bristol : Institute of Physics Publishing
Year: 2013
Subjects: subject: Corbino geometry
subject: Energy ranges
subject: Epitaxial graphene
subject: Graphene devices
subject: Magneto-optical
subject: Measurements of
subject: Terahertz detectors
subject: Terahertz radiation
subject: Germanium
subject: Graphene
subject: Magnetic fields
subject: Terahertz waves
subject: Silicon wafers
subject: Konferenzschrift
subject: Dewey Decimal Classification::500 | Naturwissenschaften::530 | Physik

description: In this study we present magnetotransport an magnetooptical data obtained in the magnetic field range 0T < B < 7T at detectors patterned in Corbino geometry on epitaxial graphene wafer using a Ge detector. We observed the cyclotron resonance of charge carriers in these wafers by measurement of the transmission of THz wafes through the unpatterned squares (about 4 × 4mm2) of the wafers as a function of the magnetic field B applied perpendicular to the wafer. Further, we performed measurements of the photocunductivity of graphene-based devices shaped in Corbino geometry, induced by terahertz (THz) radiation generated by a p-Ge laser (emitting in the energy range 7.5meV ≤ Eph ≤ 11meV). Our photoconductivity measurement imply that graphene devices are suitable for the detection of terahertz radiation.
Time resolved 3D live-cell imaging on implants
Creators: name: Ingendoh-Tsakmakidis, Alexandra
name: Nolte, Lena
name: Winkel, Andreas
name: Meyer, Heiko
name: Koroleva, Anastasia
name: Shpichka, Anastasia
name: Ripken, Tammo
name: Heisterkamp, Alexander
name: Stiesch, Meike
Publisher: name: San Francisco, CA : Public Library of Science
Year: 2018
Subjects: subject: dental implants
subject: implant materials
subject: peri-implant model
subject: Dewey Decimal Classification::500 | Naturwissenschaften::530 | Physik

description: It is estimated that two million new dental implants are inserted worldwide each year. Innovative implant materials are developed in order to minimize the risk of peri-implant inflammations. The broad range of material testing is conducted using standard 2D, terminal, and invasive methods. The methods that have been applied are not sufficient to monitor the whole implant surface and temporal progress. Therefore, we built a 3D peri-implant model using a cylindrical implant colonized by human gingival fibroblasts. In order to monitor the cell response over time, a non-toxic LIVE/DEAD staining was established and applied to the new 3D model. Our LIVE/DEAD staining method in combination with the time resolved 3D visualization using Scanning Laser Optical Tomography (SLOT), allowed us to monitor the cell death path along the implant in the 3D peri-implant model. The differentiation of living and dead gingival fibroblasts in response to toxicity was effectively supported by the LIVE/ DEAD staining. Furthermore, it was possible to visualize the whole cell-colonized implant in 3D and up to 63 hours. This new methodology offers the opportunity to record the long-term cell response on external stress factors, along the dental implant and thus to evaluate the performance of novel materials/surfaces.
Side effects of chaperone gene co-expression in recombinant protein production
Creators: name: Martínez-Alonso, Monica
name: García-Fruitós, Elena
name: Ferrer-Miralles, Neus
name: Rinas, Ursula
name: Villaverde, Antonio
Publisher: name: London : BioMed Central Ltd.
Year: 2010
Subjects: subject: chaperone
subject: chaperonin
subject: Escherichia coli protein
subject: protein ClpB
subject: protein DnaJ
subject: protein DnaK
subject: recombinant protein
subject: bacterial protein
subject: dnaK protein, E coli
subject: heat shock protein 70
subject: article
subject: bacterial cell
subject: cell inclusion
subject: cell transformation
subject: conformational transition
subject: gene expression
subject: growth inhibition
subject: nonhuman
subject: physiological process
subject: process development
subject: process optimization
subject: protein aggregation
subject: protein analysis
subject: protein binding
subject: protein conformation
subject: protein degradation
subject: protein engineering
subject: protein folding
subject: protein function
subject: protein protein interaction
subject: protein quality
subject: protein secretion
subject: protein synthesis
subject: protein targeting
subject: quality control
subject: solubility
subject: biosynthesis
subject: chemistry
subject: genetics
subject: metabolism
subject: protein stability
subject: review
subject: Bacteria (microorganisms)
subject: Bacterial Proteins
subject: Chaperonin 60
subject: Escherichia coli Proteins
subject: HSP70 Heat-Shock Proteins
subject: Molecular Chaperones
subject: Protein Folding
subject: Protein Stability
subject: Recombinant Proteins
subject: Dewey Decimal Classification::500 | Naturwissenschaften
subject: Dewey Decimal Classification::500 | Naturwissenschaften::570 | Biowissenschaften, Biologie

description: Insufficient availability of molecular chaperones is observed as a major bottleneck for proper protein folding in recombinant protein production. Therefore, co-production of selected sets of cell chaperones along with foreign polypeptides is a common approach to increase the yield of properly folded, recombinant proteins in bacterial cell factories. However, unbalanced amounts of folding modulators handling folding-reluctant protein species might instead trigger undesired proteolytic activities, detrimental regarding recombinant protein stability, quality and yield. This minireview summarizes the most recent observations of chaperone-linked negative side effects, mostly focusing on DnaK and GroEL sets, when using these proteins as folding assistant agents. These events are discussed in the context of the complexity of the cell quality network and the consequent intricacy of the physiological responses triggered by protein misfolding.
Research on Efficiency Analysis of Microservices
Creators: name: Chen, Abel C. H.
Publisher: name: arXiv
Year: 2023
Subjects: subject: Software Engineering (cs.SE)
subject: Artificial Intelligence (cs.AI)
subject: FOS: Computer and information sciences

description: With the maturity of web services, containers, and cloud computing technologies, large services in traditional systems (e.g. the computation services of machine learning and artificial intelligence) are gradually being broken down into many microservices to increase service reusability and flexibility. Therefore, this study proposes an efficiency analysis framework based on queuing models to analyze the efficiency difference of breaking down traditional large services into n microservices. For generalization, this study considers different service time distributions (e.g. exponential distribution of service time and fixed service time) and explores the system efficiency in the worst-case and best-case scenarios through queuing models (i.e. M/M/1 queuing model and M/D/1 queuing model). In each experiment, it was shown that the total time required for the original large service was higher than that required for breaking it down into multiple microservices, so breaking it down into multiple microservices can improve system efficiency. It can also be observed that in the best-case scenario, the improvement effect becomes more significant with an increase in arrival rate. However, in the worst-case scenario, only slight improvement was achieved. This study found that breaking down into multiple microservices can effectively improve system efficiency and proved that when the computation time of the large service is evenly distributed among multiple microservices, the best improvement effect can be achieved. Therefore, this study's findings can serve as a reference guide for future development of microservice architecture.
description: in Chinese language
Der Domhof und das römische Forum in Köln
Creators: name: Düntzer, Heinrich
Publisher: name: Bonner Jahrbücher
Year: 2017

description: [nicht vorhanden / not available]
description: Bonner Jahrbücher, Bd. 43 (1867): Jahrbücher des Vereins von Alterthumsfreunden im Rheinlande
BK Lyncis: The Oldest Old Nova?... And a Bellwether for Cataclysmic-Variable Evolution
Creators: name: Patterson, Joseph
name: Uthas, Helena
name: Kemp, Jonathan
name: de Miguel, Enrique
name: Krajci, Thomas
name: Foote, Jerry
name: Hambsch, Franz-Josef
name: Campbell, Tut
name: Roberts, George
name: Cejudo, David
name: Dvorak, Shawn
name: Vanmunster, Tonny
name: Koff, Robert
name: Skillman, David
name: Harvey, David
name: Martin, Brian
name: Rock, John
name: Boyd, David
name: Oksanen, Arto
name: Morelle, Etienne
name: Ulowetz, Joseph
name: Kroes, Anthony
name: Sabo, Richard
name: Jensen, Lasse
Publisher: name: arXiv
Year: 2012
Subjects: subject: Solar and Stellar Astrophysics (astro-ph.SR)
subject: FOS: Physical sciences

description: We summarize the results of a 20-year campaign to study the light curves of BK Lyncis, a nova-like star strangely located below the 2-3 hour orbital period gap in the family of cataclysmic variables. Two apparent "superhumps" dominate the nightly light curves - with periods 4.6% longer, and 3.0% shorter, than P_orb. The first appears to be associated with the star's brighter states (V~14), while the second appears to be present throughout and becomes very dominant in the low state (V~15.7). Starting in the year 2005, the star's light curve became indistinguishable from that of a dwarf nova - in particular, that of the ER UMa subclass. Reviewing all the star's oddities, we speculate: (a) BK Lyn is the remnant of the probable nova on 30 December 101, and (b) it has been fading ever since, but has taken ~2000 years for the accretion rate to drop sufficiently to permit dwarf-nova eruptions. If such behavior is common, it can explain other puzzles of CV evolution. One: why the ER UMa class even exists (because all members can be remnants of recent novae). Two: why ER UMa stars and short-period novalikes are rare (because their lifetimes, which are essentially cooling times, are short). Three: why short-period novae all decline to luminosity states far above their true quiescence (because they're just getting started in their postnova cooling). Four: why the orbital periods, accretion rates, and white-dwarf temperatures of short-period CVs are somewhat too large to arise purely from the effects of gravitational radiation (because the unexpectedly long interval of enhanced postnova brightness boosts the mean mass-transfer rate). These are substantial rewards in return for one investment of hypothesis: that the second parameter in CV evolution, besides P_orb, is time since the last classical-nova eruption.
description: PDF, 46 pages, 4 tables, 10 figures; in preparation; more info at http://cbastro.org/
Germania : Anzeiger der Römisch-Germanischen Kommission des Deutschen Archäologischen Instituts, Bd. 18, Nr. 1 (1934)
Creators: name: Germania : Anzeiger Der Römisch-Germanischen Kommission Des Deutschen Archäologischen Instituts
Publisher: name: Germania : Anzeiger der Römisch-Germanischen Kommission des Deutschen Archäologischen Instituts
Year: 2017

description: Inhalt
Die Jurakultur...1-7
Gallische Wagengräber im Gebiet des Neuvvieder Beckens...8-19
Zvveigeschossige römische Grabkammer an der Severinstraße in Köln...19-24
Zur römischen Grabkammer von Köln - Severinstraße...24-27
Eine Terra-sigillata-Töpferei in Colchester (Camulodunum)...27-36
Ein alamannischer Sax mit Runen?...36-41
[Ein alamannischer Sax mit Runen?]...41-43
Ein germanischer Grabfund der Völkerwanderungszeit aus Schwerin (Mecklenburg)...43-46
Kleine Mitteilungen...46-50
Fundchronik...51-63
Oberösterreich in der Urzeit...64
Bilderatlas zur Religionsgeschichte...65-68
Arpád Dobó, Inscriptiones ad res Pannonicas pertinentes extra provinciae fines repertae...68-69
Inscriptiones Tegularum Pannonicarum collegit Johannes Szilágyi...69-70
Die deutschen Gläser des Mittelalters...70-72
Neuerscheinungen...72-80
Titel
The effect of free radical enhancers and scavengers on accumulation of early light-inducible protein during light stress
Creators: name: Adamska, Iwona
name: Kloppstech, Klaus
name: Ohad, Itzhak
Publisher: name: Berlin : De Gruyter
Year: 1993
Subjects: subject: Chlorophyll Triplet
subject: D1 Turnover
subject: Hydroxyl Radicals
subject: Light Stress
subject: Pea Plants
subject: Dewey Decimal Classification::500 | Naturwissenschaften::570 | Biowissenschaften, Biologie

description: Involvement of active oxygen species in the accumulation of early light-inducible protein (ELIP) in mature pea plants was investigated under light stress conditions. Here we provide evidence th at hydroxyl radicals and singlet oxygen interfere with ELIP expression at both, transcriptional and posttranslational levels. Addition of free radical scavengers can alleviate the detrimental action of the radicals almost completely at the level of transcription but only a partial protection was observed at the level of proteins. The data suggest that the damage of ELIP occurs during its insertion into thylakoid membranes close to the free radical sources.
Magellan/MMIRS near-infrared multi-object spectroscopy of nebular emission from star forming galaxies at 2
Creators: name: Guaita, Lucia
name: Francke, Harold
name: Gawiser, Eric
name: Bauer, Franz E.
name: Hayes, Matthew
name: Ostlin, Goran
name: Padilla, Nelson
Publisher: name: arXiv
Year: 2013
Subjects: subject: Cosmology and Nongalactic Astrophysics (astro-ph.CO)
subject: Astrophysics of Galaxies (astro-ph.GA)
subject: FOS: Physical sciences

description: To investigate the ingredients, which allow star-forming galaxies to present Lyalpha line in emission, we studied the kinematics and gas phase metallicity (Z) of the interstellar medium. We used multi-object NIR spectroscopy with Magellan/MMIRS to study nebular emission from z=2-3 star-forming galaxies discovered in 3 MUSYC fields. We detected emission lines from four active galactic nuclei and 13 high-z star-forming galaxies, including Halpha lines down to a flux of 4.E-17 erg/sec/cm^2. This yielded 7 new redshifts. The most common emission line detected is [OIII]5007, which is sensitive to Z. We were able to measure Z for 2 galaxies and to set upper(lower) limits for another 2(2). The Z values are consistent with 0.3
description: 22 pages, 13 figures, 6 tables
Kleine Mitteilungen
Creators: name: Redaktion, Die
Publisher: name: Germania : Anzeiger der Römisch-Germanischen Kommission des Deutschen Archäologischen Instituts
Year: 2017

description: [nicht erschienen / not available]
description: Germania : Anzeiger der Römisch-Germanischen Kommission des Deutschen Archäologischen Instituts, Bd. 18, Nr. 1 (1934)
Very recent advances in vinylogous mukaiyama aldol reactions and their applications to synthesis
Creators: name: Cordes, Martin
name: Kalesse, Markus
Publisher: name: Basel : MDPI AG
Year: 2019
Subjects: subject: Aldol reactions
subject: Mukaiyama
subject: Natural product synthesis
subject: Stereoselectivity
subject: Vinylogy
subject: Dewey Decimal Classification::500 | Naturwissenschaften::540 | Chemie

description: It is a challenging objective in synthetic organic chemistry to create efficient access to biologically active compounds. In particular, one structural element which is frequently incorporated into the framework of complex natural products is a β-hydroxy ketone. In this context, the aldol reaction is the most important transformation to generate this structural element as it not only creates new C-C bonds but also establishes stereogenic centers. In recent years, a large variety of highly selective methodologies of aldol and aldol-type reactions have been put forward. In this regard, the vinylogous Mukaiyama aldol reaction (VMAR) became a pivotal transformation as it allows the synthesis of larger fragments while incorporating 1,5-relationships and generating two new stereocenters and one double bond simultaneously. This review summarizes and updates methodology-oriented and target-oriented research focused on the various aspects of the vinylogous Mukaiyama aldol (VMA) reaction. This manuscript comprehensively condenses the last four years of research, covering the period 2016-2019.
Studying Li dynamics in a gas-phase synthesized amorphous oxide by NMR and impedance spectroscopy
Creators: name: Epp, Viktor
name: Brünig, Christian
name: Binnewies, Michael
name: Heitjans, Paul
name: Wilkening, Martin
Publisher: name: Berlin : Walter de Gruyter
Year: 2012
Subjects: subject: Impedance spectroscopy
subject: Li diffusion
subject: Non-stoichiometric compounds
subject: Solid state NMR
subject: Dewey Decimal Classification::500 | Naturwissenschaften::540 | Chemie
subject: Dewey Decimal Classification::500 | Naturwissenschaften::530 | Physik

description: Li diffusion parameters of a structurally disordered Li-Al-Si-oxide prepared by gas-phase synthesis were complementarily investigated by both time-domain NMR techniques and impedance spectroscopy. The first include 7Li NMR spin-lattice relaxation (SLR) measurements in the laboratory as well as in the rotating frame of reference. An analysis of variable-temperature NMR line widths point to an activation energy E a of approximately 0.6 eV. The value is confirmed by rotating-frame SLR NMR data recorded at approximately 11 kHz. Above room temperature the low-temperature flank of a diffusion-induced rate peak shows up which can be approximated by an Arrhenius law yielding E a = 0.56(1) eV. This is in very good agreement with the result obtained from 7Li spin-alignment echo (SAE) NMR being sensitive to even slower Li dynamics. For comparison, dc-conductivity measurements, probing long-range motions, yield E a = 0.8 eV. Interestingly, lowtemperature SAE NMR decay rates point to localized Li motions being characterized with a very small activation energy of only 0.09 eV. © by Oldenbourg Wissenschaftsverlag, München.
Security and Privacy Issues in BYOD: Analytical Comparison Between MDM and RMS Solutions
Creators: name: Uwasomba, Chukwudi Festus
name: Okigbo, A. C.
name: Douglas, I. T.
Publisher: name: Zenodo
Year: 2016
Subjects: BYOD, Security, Privacy, Threats, MDM, RMS, Quantum Cryptography.

description: In this study, the security and privacy issues in Bring Your Own Device (BYOD) were critically reviewed. BYOD is a novel phenomenon that comes about with the increase in consumerization of IT. Previous research indicated that organizations which adopted BYOD saw a 70 % growth in employee productivity, 40% cost reduction on corporate – liable devices. Nevertheless, on that point are various risks that come with the adoption of this phenomenon, where security is a main worry. Among the various security issues, employee privacy is essential. This paper reviews two solutions to BYOD and outline their limitations. As well, how these limitations can be accosted with the implementation of quantum cryptography-based system in BYOD.
Das bandkeramische Dorf von Köln-Lindenthal
Creators: name: Haberey, Waldemar
Publisher: name: Germania : Anzeiger der Römisch-Germanischen Kommission des Deutschen Archäologischen Instituts
Year: 2017

description: [noch nicht erschienen / not available]
description: Germania : Anzeiger der Römisch-Germanischen Kommission des Deutschen Archäologischen Instituts, Bd. 19, Nr. 2 (1935)
Visualization of the Gödel universe
Creators: name: Buser, Michael
name: Kajari, Endre
name: Schleich, Wolfgang P.
Publisher: name: arXiv
Year: 2013
Subjects: subject: General Relativity and Quantum Cosmology (gr-qc)
subject: FOS: Physical sciences

description: The standard model of modern cosmology, which is based on the Friedmann-Lemaître-Robertson-Walker metric, allows the definition of an absolute time. However, there exist (cosmological) models consistent with the theory of general relativity for which such a definition cannot be given since they offer the possibility of time travel. The simplest of these models is the cosmological solution discovered by Kurt Gödel, which describes a homogeneous, rotating universe. Disregarding the paradoxes that come along with the abolishment of causality in such spacetimes, we are interested in the purely academical question how an observer would visually perceive the time travel of an object in Gödel's universe. For this purpose, we employ the technique of ray tracing, a standard tool in computer graphics, and visualize various scenarios to bring out the optical effects experienced by an observer located in this universe. In this way, we provide a new perspective on the space-time structure of Gödel's model.
description: 34 pages, 20 figures, for supplementary movies and higher quality figures please visit http://iopscience.iop.org/1367-2630/15/1/013063