cometadata/datacite-rtg-text-other-reclassification-records huggingface dataset:
ANTROPOFAGIA EN TIEMPO PRESENTE DE LA NECESIDAD DE UNA REINVENCIÓN
Creators: name: Cámara, Mario
Publisher: name: Zenodo
Year: 2023
Subjects: Antropofagia
Antropophagy
Brasil
Brazil
Negociación
Negotiation
Conflicto
Conflict

description: El presente texto propone una mirada retrospectiva sobre el movimiento antropófago brasileño liderado por Oswald de Andrade a fines de los años veinte del siglo pasado, considerándolo como el más importante durante el siglo XX. Se analizan sus premisas iniciales, que eran a un mismo tiempo, culturales, sociales y políticas; y su posterior reaparición durante los años sesenta, también del siglo pasado. En este segundo momento y en debate con el pensamiento de izquierda y su ideología del progreso, la antropofagia imaginó un Brasil precario y cosmopolita, tercermundista y sofisticado, y se propuso como un dispositivo crítico capaz de administrar los efectos de una modernización desigual. El presente, con la reciente experiencia bolsonarista y los nuevos activismos identitarios supone una crisis y un desafío para la antropofagia. El artículo sostiene que la antropofagia debe convertirse para ser el espacio en el que en el que las violencias fundacionales, la esclavitud, el exterminio indígena y la violencia sexual sobre las esclavas negras y las indígenas, sean trabajadas una y otra vez sin la pretensión de cualquier tipo de clausura.
Hubble Space Telescope observations of the old pulsar PSR J0108-1431
Creators: name: Abramkin, Vadim
name: Shibanov, Yuriy
name: Mignani, Roberto P.
name: Pavlov, George G.
Publisher: name: arXiv
Year: 2021
Subjects: subject: High Energy Astrophysical Phenomena (astro-ph.HE)
subject: FOS: Physical sciences

description: We present results of optical-UV observations of the 200 Myr old rotation-powered radio pulsar J0108$-$1431 with the Hubble Space Telescope. We found a putative candidate for the far-UV (FUV) pulsar counterpart, with the flux density $f_ν= 9.0\pm 3.2$ nJy at $λ= 1528$ Å. The pulsar was not detected, however, at longer wavelengths, with $3σ$ upper limits of 52, 37, and 87 nJy at $λ=$ 4326, 3355, and 2366 Å, respectively. Assuming that the pulsar counterpart was indeed detected in FUV, and the previously reported marginal $U$ and $B$ detections with the Very Large Telescope were real, the optical-UV spectrum of the pulsar can be described by a power-law model with a nearly flat $f_ν$ spectrum. Similar to younger pulsars detected in the optical, the slope of the nonthermal spectrum steepens in the X-ray range. The pulsar's luminosity in the 1500--6000 Åwavelength range, $L \sim 1.2\times 10^{27} (d/210\,{\rm pc})^2$ erg s$^{-1}$, corresponds to a high efficiency of conversion of pulsar rotation energy loss rate $\dot {E}$ to the optical-UV radiation, $η= L/\dot{E} \sim (1$--$6)\times 10^{-4}$, depending on somewhat uncertain values of distance and spectral slope. The brightness temperature of the bulk neutron star surface does not exceed 59,000 K ($3σ$ upper bound), as seen by a distant observer. If we assume that the FUV flux is dominated by a thermal component, then the surface temperature can be in the range of 27,000--55,000 K, requiring a heating mechanism to operate in old neutron stars.
description: 14 pages, 7 figures, 7 tables. Accepted to ApJ
A Kirchhoff-like conservation law in Regge calculus
Creators: name: Gentle, Adrian P.
name: Kheyfets, Arkady
name: McDonald, Jonathan R.
name: Miller, Warner A.
Publisher: name: arXiv
Year: 2008
Subjects: subject: General Relativity and Quantum Cosmology (gr-qc)
subject: FOS: Physical sciences

description: Simplicial lattices provide an elegant framework for discrete spacetimes. The inherent orthogonality between a simplicial lattice and its circumcentric dual yields an austere representation of spacetime which provides a conceptually simple form of Einstein's geometric theory of gravitation. A sufficient understanding of simplicial spacetimes has been demonstrated in the literature for spacetimes devoid of all non-gravitational sources. However, this understanding has not been adequately extended to non-vacuum spacetime models. Consequently, a deep understanding of the diffeomorphic structure of the discrete theory is lacking. Conservation laws and symmetry properties are attractive starting points for coupling matter with the lattice. We present a simplicial form of the contracted Bianchi identity which is based on the E. Cartan moment of rotation operator. This identity manifests itself in the conceptually-simple form of a Kirchhoff-like conservation law. This conservation law enables one to extend Regge Calculus to non-vacuum spacetimes and provides a deeper understanding of the simplicial diffeomorphism group.
description: 13 pages, 4 figures
Electric Dipole Moments of Dyon and `Electron'
Creators: name: Kobayashi, Makoto
name: Kugo, Taichiro
name: Tokunaga, Tatsuya
Publisher: name: arXiv
Year: 2007
Subjects: subject: High Energy Physics - Theory (hep-th)
subject: FOS: Physical sciences

description: The electric and magnetic dipole moments of dyon fermions are calculated within N=2 supersymmetric Yang-Mills theory including the theta-term. It is found, in particular, that the gyroelectric ratio deviates from the canonical value of 2 for the monopole fermion (n_m=1,n_e=0) in the case theta\not=0. Then, applying the S-duality transformation to the result for the dyon fermions, we obtain an explicit prediction for the electric dipole moment (EDM) of the charged fermion (`electron'). It is thus seen that the approach presented here provides a novel method for computing the EDM induced by the theta-term.
description: 16pages, no figures, PTPTeX, typos corrected, published version
Probing Kondo spin fluctuations with scanning tunneling microscopy and electron spin resonance
Creators: name: Fang, Yinan
name: Chesi, Stefano
name: Choi, Mahn-Soo
Publisher: name: arXiv
Year: 2021
Subjects: subject: Mesoscale and Nanoscale Physics (cond-mat.mes-hall)
subject: Strongly Correlated Electrons (cond-mat.str-el)
subject: FOS: Physical sciences

description: We theoretically analyze a state-of-the-art experimental method based on a combination of electron spin resonance and scanning tunneling microscopy (ESR-STM), to directly probe the spin fluctuations in the Kondo effect. The Kondo impurity is exchange coupled to the probe spin, and the ESR-STM setup detects the small level shifts in the probe spin induced by the spin fluctuations of the Kondo impurity. We use the open quantum system approach by regarding the probe spin as the "system" and the Kondo impurity spin as the fluctuating "bath" to evaluate the resonance line shifts in terms of the dynamic spin susceptibility of the Kondo impurity. We consider various common adatoms on surfaces as possible probe spins and estimate the corresponding level shifts. It is found that the sensitivity is most pronounced for the probe spins with transverse magnetic anisotropy.
description: 12 pages, 7 figures; to appear in PRB
title: MHC class II variation in a rare and ecological specialist mouse lemur reveals lower allelic richness and contrasting selection patterns compared to a generalist and widespread sympatric congener
Creators: name: Pechouskova, Eva
name: Dammhahn, Melanie
name: Brameier, Markus
name: Fichtel, Claudia
name: Kappeler, Peter M.
name: Huchard, Elise
Publisher: name: Universität Potsdam
Year: 2019

description: The polymorphism of immunogenes of the major histocompatibility complex (MHC) is thought to influence the functional plasticity of immune responses and, consequently, the fitness of populations facing heterogeneous pathogenic pressures. Here, we evaluated MHC variation (allelic richness and divergence) and patterns of selection acting on the two highly polymorphic MHC class II loci (DRB and DQB) in the endangered primate Madame Berthe's mouse lemur (Microcebus berthae). Using 454 pyrosequencing, we examined MHC variation in a total of 100 individuals sampled over 9 years in Kirindy Forest, Western Madagascar, and compared our findings with data obtained previously for its sympatric congener, the grey mouse lemur (Microcebus murinus). These species exhibit a contrasting ecology and demography that were expected to affect MHC variation and molecular signatures of selection. We found a lower allelic richness concordant with its low population density, but a similar level of allelic divergence and signals of historical selection in the rare feeding specialist M. berthae compared to the widespread generalist M. murinus. These findings suggest that demographic factors may exert a stronger influence than pathogen-driven selection on current levels of allelic richness in M. berthae. Despite a high sequence similarity between the two congeners, contrasting selection patterns detected at DQB suggest its potential functional divergence. This study represents a first step toward unravelling factors influencing the adaptive divergence of MHC genes between closely related but ecologically differentiated sympatric lemurs and opens new questions regarding potential functional discrepancy that would explain contrasting selection patterns detected at DQB.
description: Postprints der Universität Potsdam : Mathematisch-Naturwissenschaftliche Reihe, 728
title: Cities to the rescue?
title: Assessing the performance of transnational municipal networks in global climate governance
titleType: Subtitle
Creators: name: Bansard, Jennifer S.
name: Pattberg, Philipp H.
name: Widerberg, Oscar
Publisher: name: Universität Potsdam
Year: 2019

description: Despite the proliferation and promise of subnational climate initiatives, the institutional architecture of transnational municipal networks (TMNs) is not well understood. With a view to close this research gap, the article empirically assesses the assumption that TMNs are a viable substitute for ambitious international action under the United Nations Framework Convention on Climate Change (UNFCCC). It addresses the aggregate phenomenon in terms of geographical distribution, central players, mitigation ambition and monitoring provisions. Examining thirteen networks, it finds that membership in TMNs is skewed toward Europe and North America while countries from the Global South are underrepresented; that only a minority of networks commit to quantified emission reductions and that these are not more ambitious than Parties to the UNFCCC; and finally that the monitoring provisions are fairly limited. In sum, the article shows that transnational municipal networks are not (yet) the representative, ambitious and transparent player they are thought to be.
description: Postprints der Universität Potsdam : Wirtschafts- und Sozialwissenschaftliche Reihe, 105
ON GAUSSIAN PROCESSES AND NEURONAL MODELING:
COMPUTATIONAL AND SIMULATION APPROACHES
Creators: name: Pirozzi, Enrica
Publisher: name: Università degli Studi di Napoli Federico II
Year: 2010

description: This thesis is focused on problems concerning the modeling of the activity of single neurons in which stochastic processes of various nature are involved to mimic neuron's spiking activity. A central role is played by Gaussian processes and the related first-passage-time (FPT) problem that, within the present framework, is representative of the neuronal firing times. The Gaussian processes use of  which is made are of a two-fold type: Markov and non Markov. For both an abridged outline of the main features is provided, and analytic, computation and simulation methods developed to obtain information on the FPT probabilistic and statistical features are discussed. For Gaussian processes of Markov type a purely computational approach based on numerical quadratures for integral equations is presented, which is suitable for FPT probability densities determination. The major problem of modeling neuronal activity by means of Leaky-Integrate-and Fire (LIF) models in the presence of both constant and periodic stimuli is then approached. Here, essential role is played by previously obtained results on the Ornstein-Uhlenbeck process  and on Markov-Gaussian processes in the presence of asymptotically constant or asymptotically periodic boundaries (henceforth also called "thresholds"). A totally different approach to the understanding of the statistical features of FPT probability densities for non Markov Gaussian processes has been adopted. This consists of direct simulation of the process' sample paths. The implemented simulation techniques, long considered by us, are then described,  and the analysis of the corresponding performances and accuracies is performed.
Motivated by the need of enhanced flexibility of the mathematical models in relation to certain phenomenological features of neuronal activity, the possibility of varying initial state according to pre-assigned distributions or of differently specified correlation times and asymptotic behaviors are introduced as well. The representation of the simulated data has finally been considered by resorting to the construction of histograms whose detailed specification is provided jointly with various other auxiliary results. These  include an algorithm for numerical evaluation of integrals via the construction of certain families of orthogonal polynomials.
The Interaction Between a Pulsed Astrophysical Jet and Small-Scale Heterogeneous Media
Creators: name: Yirak, Kristopher
name: Frank, Adam
name: Cunningham, Andrew
name: Mitran, Sorin
Publisher: name: arXiv
Year: 2007
Subjects: subject: Astrophysics (astro-ph)
subject: FOS: Physical sciences

description: We have performed 2D hydrodynamic simulations of a pulsed astrophysical jet propagating through a medium that is populated with spherical inhomogeneities, or "clumps," which are smaller than the jet radius. The clumps are seen to affect the jet in several ways, such as impeding jet propagation and deflecting the jet off-axis. While there has been some debate as to the prevalence of these types of condensations in the ISM or in molecular clouds, the exploration of this region of parameter space nonetheless both shows the potential for these clumps to disrupt astrophysical jets and yields results which recover aspects of recent observations of Herbig-Haro objects. We find that the propagation of the jet and the vorticity induced in the clump/ambient medium correlate well with a "dynamic filling function" $f_d$ across all the simulations.
description: 23 pages, 11 figures; submitted to ApJ
title: Microarray-based method for screening of immunogenic proteins from bacteria
Creators: name: Hoppe, Sebastian
name: Bier, Frank F.
name: Nickisch-Rosenegk, Markus von
Publisher: name: Universität Potsdam
Year: 2019

description: Background: Detection of immunogenic proteins remains an important task for life sciences as it nourishes the understanding of pathogenicity, illuminates new potential vaccine candidates and broadens the spectrum of biomarkers applicable in diagnostic tools. Traditionally, immunoscreenings of expression libraries via polyclonal sera on nitrocellulose membranes or screenings of whole proteome lysates in 2-D gel electrophoresis are performed. However, these methods feature some rather inconvenient disadvantages. Screening of expression libraries to expose novel antigens from bacteria often lead to an abundance of false positive signals owing to the high cross reactivity of polyclonal antibodies towards the proteins of the expression host. A method is presented that overcomes many disadvantages of the old procedures.

Results: Four proteins that have previously been described as immunogenic have successfully been assessed immunogenic abilities with our method. One protein with no known immunogenic behaviour before suggested potential immunogenicity. We incorporated a fusion tag prior to our genes of interest and attached the expressed fusion proteins covalently on microarrays. This enhances the specific binding of the proteins compared to nitrocellulose. Thus, it helps to reduce the number of false positives significantly. It enables us to screen for immunogenic proteins in a shorter time, with more samples and statistical reliability. We validated our method by employing several known genes from Campylobacter jejuni NCTC 11168.

Conclusions: The method presented offers a new approach for screening of bacterial expression libraries to illuminate novel proteins with immunogenic features. It could provide a powerful and attractive alternative to existing methods and help to detect and identify vaccine candidates, biomarkers and potential virulence-associated factors with immunogenic behaviour furthering the knowledge of virulence and pathogenicity of studied bacteria.
description: Postprints der Universität Potsdam : Mathematisch-Naturwissenschaftliche Reihe, 726
An Approach to Pattern Recognition by Evolutionary Computation
Creators: name: Fontanella, Francesco
Publisher: name: Università degli Studi di Napoli Federico II
Year: 2006

description: Evolutionary Computation has been inspired by the natural phenomena of evolution. It provides a quite general heuristic, exploiting few basic concepts: reproduction of individuals, variation phenomena that affect the likelihood of survival of individuals, inheritance of parents features by offspring. EC has been widely used in the last years to effectively solve hard, non linear and very complex problems.
Among the others, EC–based algorithms have also been used to tackle
classification problems. Classification is a process according to which  an object is attributed to one of a finite set of classes or, in other  words, it is recognized as belonging to a set of equal or similar entities, identified by a label. Most likely, the main aspect of classification concerns the generation of prototypes to be used to recognize unknown patterns. The role of prototypes is that of representing patterns belonging to the different classes defined within a given problem. For most of the problems of practical interest, the generation of such prototypes is a very hard problem, since a prototype must be able to represent patterns belonging to the same class, which may be significantly dissimilar each other. They must also be able to discriminate patterns belonging to classes different from the one that they represent. Moreover, a prototype should contain the minimum amount of information required to satisfy the requirements just mentioned. The research presented in this thesis, has led to the definition of an EC–based framework to be used for prototype generation. The defined framework does not provide for the use of any particular kind of prototypes. In fact, it can generate any kind of prototype once an encoding scheme for the used prototypes has been defined. The generality of the framework can be exploited to develop many applications. The framework has been employed to implement two specific applications for prototype generation.
The developed applications have been tested on several data sets and the results compared with those obtained by other approaches previously presented in the literature.
Stability of the Schwarzschild Interior in Loop Quantum Gravity
Creators: name: Boehmer, Christian G.
name: Vandersloot, Kevin
Publisher: name: arXiv
Year: 2008
Subjects: subject: General Relativity and Quantum Cosmology (gr-qc)
subject: FOS: Physical sciences

description: In recent work, the Schwarzschild interior of a black hole was investigated, incorporating quantum gravitational modifications due to loop quantum gravity. The central Schwarzschild singularity was shown to be replaced by a Nariai type universe. In this brief report we show that this interior solution is stable with respect to small perturbations, in contrast to the classical Nariai universe.
description: 4 pages, 4 figures; references added, minor modifications
title: Cost-effectiveness of cardiovascular magnetic resonance and single-photon emission computed tomography for diagnosis of coronary artery disease in Germany
Creators: name: Boldt, Julia
name: Leber, Alexander W.
name: Bonaventura, Klaus
name: Sohns, Christian
name: Stula, Martin
name: Huppertz, Alexander
name: Haverkamp, Wilhelm
name: Dorenkamp, Marc
Publisher: name: Universität Potsdam
Year: 2019

description: Background: Recent studies have demonstrated a superior diagnostic accuracy of cardiovascular magnetic resonance (CMR) for the detection of coronary artery disease (CAD). We aimed to determine the comparative cost-effectiveness of CMR versus single-photon emission computed tomography (SPECT).

Methods: Based on Bayes' theorem, a mathematical model was developed to compare the cost-effectiveness and utility of CMR with SPECT in patients with suspected CAD. Invasive coronary angiography served as the standard of reference. Effectiveness was defined as the accurate detection of CAD, and utility as the number of quality-adjusted life-years (QALYs) gained. Model input parameters were derived from the literature, and the cost analysis was conducted from a German health care payer's perspective. Extensive sensitivity analyses were performed.

Results: Reimbursement fees represented only a minor fraction of the total costs incurred by a diagnostic strategy. Increases in the prevalence of CAD were generally associated with improved cost-effectiveness and decreased costs per utility unit (Delta QALY). By comparison, CMR was consistently more cost-effective than SPECT, and showed lower costs per QALY gained. Given a CAD prevalence of 0.50, CMR was associated with total costs of (sic)6,120 for one patient correctly diagnosed as having CAD and with (sic)2,246 per Delta QALY gained versus (sic)7,065 and (sic)2,931 for SPECT, respectively. Above a threshold value of CAD prevalence of 0.60, proceeding directly to invasive angiography was the most cost-effective approach.

Conclusions: In patients with low to intermediate CAD probabilities, CMR is more cost-effective than SPECT. Moreover, lower costs per utility unit indicate a superior clinical utility of CMR.
description: Postprints der Universität Potsdam : Humanwissenschaftliche Reihe, 551
Semiclassical description of the kinematically complete experiments
Creators: name: Jarai-Szabo, F.
name: Nagy, L.
Publisher: name: arXiv
Year: 2007
Subjects: subject: Atomic Physics (physics.atom-ph)
subject: FOS: Physical sciences

description: Based on the semiclassical, impact parameter method a theoretical model is constructed to calculate totally differential cross sections for single ionization of helium by impact with fast C$^{6+}$ ions. Good agreement with the experiment is achieved in the scattering plane, while in the perpendicular plane a similar structure to that observed experimentally is obtained. The contribution of different partial waves to the cross section is also investigated.
description: 9 pages, 6 figures
Wikidata for 5-star Linked Open Databases: A case study of PanglaoDB
Creators: name: Lubiana, Tiago
name: Cavalcante, João Vitor Ferreira
Publisher: name: Zenodo
Year: 2021
Subjects: wikidata
panglaodb
biocuration
cell type

description: Poster and presentation, both presented at 2021 ISMB Bio-Ontologies Community of Special Interest.

 T.L. is supported by grant #2019/26284-1 from the São Paulo Research Foundation (FAPESP).
Quantized edge magnetizations and their symmetry protection in one-dimensional quantum spin systems
Creators: name: Furuya, Shunsuke C.
name: Sato, Masahiro
Publisher: name: arXiv
Year: 2021
Subjects: subject: Strongly Correlated Electrons (cond-mat.str-el)
subject: Statistical Mechanics (cond-mat.stat-mech)
subject: FOS: Physical sciences

description: The bulk electric polarization works as a nonlocal order parameter that characterizes topological quantum matters. Motivated by a recent paper [H. Watanabe \textit{et al.}, Phys. Rev. B {\bf 103}, 134430 (2021)], we discuss magnetic analogs of the bulk polarization in one-dimensional quantum spin systems, that is, quantized magnetizations on the edges of one-dimensional quantum spin systems.The edge magnetization shares the topological origin with the fractional edge state of the topological odd-spin Haldane phases. Despite this topological origin, the edge magnetization can also appear in topologically trivial quantum phases. We develop straightforward field theoretical arguments that explain the characteristic properties of the edge magnetization. The field theory shows that a U(1) spin-rotation symmetry and a site-centered or bond-centered inversion symmetry protect the quantization of the edge magnetization. We proceed to discussions that quantum phases on nonzero magnetization plateaus can also have the quantized edge magnetization that deviates from the magnetization density in bulk. We demonstrate that the quantized edge magnetization distinguishes two quantum phases on a magnetization plateau separated by a quantum critical point. The edge magnetization exhibits an abrupt stepwise change from zero to $1/2$ at the quantum critical point because the quantum phase transition occurs in the presence of the symmetries protecting the quantization of the edge magnetization. We also show that the quantized edge magnetization can result from the spontaneous ferrimagnetic order.
Danneggiamento per via radicalica di proteine contenenti residui solforati e formazione di lipidi trans in sistemi modello
Creators: name: Manco, Immacolata
Publisher: name: Università degli Studi di Napoli Federico II
Year: 2006

description: The present thesis deals with structural changes of sulfur-containing proteins exposed to radiation and the damage induced by thiyl radicals (RS•) generated from these proteins to unsaturated lipids in large unilamellar vesicles (LUVET). In particular, the production of H• atoms under reductive stress conditions was correlated to the specific damage of sulphur moieties of analyzed proteins with release of low-molecular-weight thiols. In parallel, it was demonstrated that structural changes of -amyloid (A) induced by NO2• and CO3•– radicals, involved mainly the oxidation of the Met35.
-Radiolysis was the source of oxidative damage in lipid vesicle suspensions (DOPC, POPC), in the presence of sulphur-containing either proteins (RNase A, lysozyme) or an amino acid (Met) that were used as source of thiyl radical damage occurring in vivo. Biomimetic models of thiyl radical–catalyzed isomerization of cis phospholipids, were used to demonstrate that when thiyl radicals are generated in the aqueous compartment and are able to diffuse in the lipid bilayer, then their interaction with unsaturated fatty acyl chains efficiently produces trans double bonds. Methionine could be the main source of thiyl radicals.
Control experiments in the absence of sulphur-containing proteins (RNase T1) or by replacing sulphur-containing proteins with a protein lacking sulphur-containing amino acids, (histone H1), did not show any isomerization. The formation of thyil radicals by degradation of sulphur-containing amino acids could produces a tandem radical damage involving both protein and lipid domains.
Refining the predictions of supersymmetric CP-violating models: A top-down approach
Creators: name: Argyrou, M.
name: Lahanas, A. B.
name: Spanos, V. C.
Publisher: name: arXiv
Year: 2008
Subjects: subject: High Energy Physics - Phenomenology (hep-ph)
subject: FOS: Physical sciences

description: We explore in detail the consequences of the CP-violating phases residing in the supersymmetric and soft SUSY breaking parameters in the approximation that family flavour mixings are ignored. We allow for non-universal boundary conditions and in such a consideration the model is described by twelve independent CP-violating phases and one angle which misaligns the vacuum expectation values (VEVs) of the Higgs scalars. We run two-loop renormalization group equations (RGEs), for all parameters involved, including phases, and we properly treat the minimization conditions using the one-loop effective potential with CP-violating phases included. We show that the two-loop running of phases may induce sizable effects for the electric dipole moments (EDMs) that are absent in the one-loop RGE analysis. Also important corrections to the EDMs are induced by the Higgs VEVs misalignment angle which are sizable in the large tanb region. Scanning the available parameter space we seek regions compatible with accelerator and cosmological data with emphasis on rapid neutralino annihilations through a Higgs resonance. It is shown that large CP-violating phases, as required in Baryogenesis scenarios, can be tuned to obtain agreement with WMAP3 cold dark matter constraints, EDMs and all available accelerator data, in extended regions of the parameter space which may be accessible to LHC.
description: 41 pages, 22 eps figures. A reference added and a typo corrected; version to appear in JHEP
Effects of crosslinks on motor-mediated filament organization
Creators: name: Ziebert, Falko
name: Aranson, Igor S.
name: Tsimring, Lev S.
Publisher: name: arXiv
Year: 2007
Subjects: subject: Soft Condensed Matter (cond-mat.soft)
subject: FOS: Physical sciences

description: Crosslinks and molecular motors play an important role in the organization of cytoskeletal filament networks. Here we incorporate the effect of crosslinks into our model of polar motor-filament organization [Phys. Rev. E {\bf 71}, 050901 (2005)], through suppressing the relative sliding of filaments in the course of motor-mediated alignment. We show that this modification leads to a nontrivial macroscopic behavior, namely the oriented state exhibits a transverse instability in contrast to the isotropic instability that occurs without crosslinks. This transverse instability leads to the formation of dense extended bundles of oriented filaments, similar to recently observed structures in actomyosin. This model also can be applied to situations with two oppositely directed motor species or motors with different processing speeds.
description: 15 pages, 5 figures, submitted to New. J. Phys
Book of Abstracts, International Conference "Approaches to Multimodal Digital Environments: from theories to practices"
Creators: name: Adami, Elisabetta
name: Arizzi, Cristina
name: Karatza, Styliani
name: Marenzi, Ivana
name: Moschini, Ilaria
name: Petroni, Sandra
name: Rocca, Marc
name: Sindoni, Maria Grazia
Publisher: name: Zenodo
Year: 2019
Subjects: multimodality
digital literacy
intercultural communication

description: Multimodal digital communication is the main theme of this conference meant to attract multidisciplinary research on a wide range of issues from teaching and learning to analysing multimodal digital data appearing in multiple communication arenas.

a-mode.eumade4ll.eu

Keynote speakers:

Marina Bondi

Carey Jewitt

Rodney Jones

Gunther Kress and Jeff Bezemer

David Machin

Theo van Leeuwen

A-MODE ORGANIZING COMMITTEE

    Elisabetta Adami – University of Leeds, UK

    Cristina Arizzi – University of Messina, Italy

    Styliani Karatza – National and Kapodistrian University of Athens,

    Greece, and University of Leeds, UK

    Ivana Marenzi – L3S Research Center, Leibniz University of Hannover, Germany

    Ilaria Moschini – University of Florence, Italy

    Sandra Petroni – University of Rome ‘Tor Vergata’, Italy

    Marc Rocca – Rocca Creative Thinking Limited, UK

    Maria Grazia Sindoni – University of Messina, Italy
Can binary mergers produce maximally spinning black holes?
Creators: name: Kesden, Michael
Publisher: name: arXiv
Year: 2008
Subjects: subject: Astrophysics (astro-ph)
subject: General Relativity and Quantum Cosmology (gr-qc)
subject: FOS: Physical sciences

description: Gravitational waves carry away both energy and angular momentum as binary black holes inspiral and merge. The relative efficiency with which they are radiated determines whether the final black hole of mass $M_f$ and spin $S_f$ saturates the Kerr limit ($χ_f \equiv S_f/M_f^2 \leq 1$). Extrapolating from the test-particle limit, we propose expressions for $S_f$ and $M_f$ for mergers with initial spins aligned or anti-aligned with the orbital angular momentum. We predict the the final spin at plunge for equal-mass non-spinning binaries to better than 1%, and that equal-mass maximally spinning aligned mergers lead to nearly maximally spinning final black holes ($χ_f \simeq 0.9988$). We also find black holes can always be spun up by aligned mergers provided the mass ratio is small enough.
description: 4 pages, 6 figues, sublitted to PRL
The response of black hole spark gaps to external changes: A production mechanism of rapid TeV flares?
Creators: name: Kisaka, Shota
name: Levinson, Amir
name: Toma, Kenji
name: Niv, Idan
Publisher: name: arXiv
Year: 2021
Subjects: subject: High Energy Astrophysical Phenomena (astro-ph.HE)
subject: FOS: Physical sciences

description: We study the response of a starved Kerr black hole magnetosphere to abrupt changes in the intensity of disk emission and in the global magnetospheric current, by means of 1D general relativistic particle-in-cell simulations. Such changes likely arise from the intermittency of the accretion process. We find that in cases where the pair production opacity contributed by the soft disk photons is modest, as in, e.g., M87, such changes can give rise to delayed, strong TeV flares, dominated by curvature emission of particles accelerated in the gap. The flare rise time, and the delay between the external variation and the onset of the flare emitted from the outer gap boundary, are of the order of the light crossing time of the gap. The rapid, large amplitude TeV flares observed in M87 and, perhaps, other AGNs may be produced by such a mechanism.
description: 7 pages, 4 figures, 1 table. Accepted for publication in Astrophysical Journal
Made to measure : the tape measure and the construction of the ideal American, 1800-1939
Creators: name: Wilson, Kristen Marie
Publisher: name: The University of Texas at Austin
Year: 2020
Subjects: Measurement
American studies

description: Today, most Americans use the tape measure to track children’s height or to find measurements for clothing. In this report, I trace the history of the tape measure from its invention by English tailors in the early 1800s through its uses by racial scientists, bodybuilders, performers, and average Americans attempting to validate their racial and gender-coded identities. I argue that the tape measure is an incredibly important artifact of the push for standardization of the human body that accelerated between the mid-1800s through 1939. As an object that served white supremacist regimes and allowed for the collapse of objective measurement into subjective social implications of superiority, the tape measure can be considered a haunted object in line with hauntology. In this way, the tape measure serves as reminder of not only the violent introduction of standardization that perpetuated existing racist, sexist, and ableist attitudes and policies, but a suggestion of a lost future and how modernity may have preceded without standardization, the road not taken. This paper is one perspective on a phenomenon that incorporated many other tools and scales for its purposes; the scale, the IQ test, the Kinsey scale, etc. all served the purpose of quantifying aspects of human experience and being in order to establish norms and perpetuate echelons of worthiness. The central thrust of this paper ends in 1939, with the first meaningful survey of American women’s measurements in order to establish standardized clothing styles. However, the paper obviously also ends suggesting the start of World War II and some of the most profound consequences of eugenic thought entrenched and legitimized by “objective” scientific measurement of human worth and evolution.
La matrice extracellulare prodotta dai fibroblasti cardiaci è il substrato ottimale per l'epansione ex vivo delle cellule staminali cardiache.
Creators: name: Miraglia, Rita
Publisher: name: Università degli Studi di Napoli Federico II
Year: 2010

description: Il cuore umano adulto possiede una riserva di cellule staminali, CD117 positive, che sono capaci di differenziare nelle tre principali linee cellulari cardiache, contribuendo al turnover cellulare. Lo scopo di questo lavoro è stato quello di chiarire, in vitro, gli effetti di una ECM naturale (Cardiogel), ottenuta dalla coltura di fibroblasti isolati da cuori umani adulti normali e da cuori espiantati per insufficienza cardiaca post-ischemica, sulla biologia delle cellule primitive cardiache (CPC) CD117 positive (+) anch’esse isolate da cuori umani adulti normali e post-ischemici.
Work as a problem of distributive justice
Creators: name: Preinsperger, Kurt
Publisher: name: University of British Columbia
Year: 2010

description: This thesis tackles a problem of contemporary society: What constitutes a just distribution of work? After an analysis of "work" as a family resemblance concept in the manner of Wittgenstein, I discuss the dual nature of work as both a benefit and a burden, a benefit because it can provide a livelihood, comfort, prestige, power, social contacts, self-esteem and self-realization, a burden because it can involve toil, tedium, danger, humiliation and dehumanization. I appraise some important value judgments about work - that it has dignity and spirituality, that it contributes to society, that it is a duty, a right, a privilege, a necessity. Reflecting on the nature of distributive justice, I criticize four distinct approaches: moral skepticism, the confusion of law and justice, a number of influential stipulative definitions of justice which are either blatantly arbitrary or insufficiently general, and three attempts to derive the principles of justice from less controversial assumptions. I try to show that an understanding of justice is best elicited in paradigm situations of injustice, and that principles of justice can be extracted, although imperfectly, from such situations and applied to more or less analogous situations. The principle of justice I apply to the distribution of work requires that no citizen be discriminated against, on irrelevant grounds, in the distribution of social benefits and burdens. Although no explication of "irrelevant grounds" seems generally sound, I argue that there is a strong presumption of discrimination on irrelevant grounds whenever people are put at a serious disadvantage through no fault of their own by modifiable social arrangements. After explaining why no single, society-wide distribution of work can be generated simply by an appeal to justice, I focus on the existing work allocation process and identify ways in which it puts people at a serious disadvantage through no fault of their own. Examples are the prevalence of favoritism, the inflation of formal job requirements, lack of access to training and job vacancy information, and work monopolies protected by sheltering mechanisms. I conclude with a brief survey of reform proposals, such as worksharing and job creation, as well as the twofold role of a guaranteed income in relieving pressure on the job market and compensating vicitims of social injustice.
Caratterizzazione fenotipica e molecolare per facilitare il miglioramento genetico di Cucurbita pepo
Creators: name: Formisano, Gelsomina
Publisher: name: Università degli Studi di Napoli Federico II
Year: 2010

description: Lo svolgimento della presente tesi è stato volto al miglioramento genetico dello zucchino per caratteri di interesse agronomici quali caratteristiche morfologiche e di resistenza ai principali patogeni dell’area mediterranea.
In particolare, per raggiungere tali obiettivi è stata effettuata una caratterizzazione morfologica di una collezione di varietà di zucchino,una valutazione di alcuni genotipi per la resistenza a ZYMV, WMV, CMV e oidio,una selezione per caratteri agronomici e un’analisi molecolare sia per caratterizzare la variabilità genetica presente che per identificare marcatori eventualmente associati a caratteri di resistenza.
Solar wind rotation rate and shear at coronal hole boundaries, possible consequences for magnetic field inversions
Creators: name: Pinto, R. F.
name: Poirier, N.
name: Rouillard, A. P.
name: Kouloumvakos, A.
name: Griton, L.
name: Fargette, N.
name: Kieokaew, R.
name: Lavraud, B.
name: Brun, A. S.
Publisher: name: arXiv
Year: 2021
Subjects: subject: Solar and Stellar Astrophysics (astro-ph.SR)
subject: FOS: Physical sciences

description: In-situ measurements by several spacecraft have revealed that the solar wind is frequently perturbed by transient structures (magnetic folds, jets, waves, flux-ropes) that propagate rapidly away from the Sun over large distances. Parker Solar Probe has detected frequent rotations of the magnetic field vector at small heliocentric distances, accompanied by surprisingly large solar wind rotation rates. The physical origin of such magnetic field bends, the conditions for their survival across the interplanetary space, and their relation to solar wind rotation are yet to be clearly understood. We traced measured solar wind flows from the spacecraft position down to the surface of the Sun to identify their potential source regions and used a global MHD model of the corona and solar wind to relate them to the rotational state of the low solar corona. We identified regions of the solar corona for which solar wind speed and rotational shear are important and long-lived, that can be favourable to the development of magnetic deflections and to their propagation across extended heights in the solar wind. We show that coronal rotation is highly structured and that enhanced flow shear develops near the boundaries between coronal holes and streamers, around and above pseudo-streamers, even when such boundaries are aligned with the direction of solar rotation. A large fraction of the switchbacks identified by PSP map back to these regions, both in terms of instantaneous magnetic field connectivity and of the trajectories of wind streams that reach the spacecraft. These regions of strong shears are likely to leave an imprint on the solar wind over large distances and to increase the transverse speed variability in the slow solar wind. The simulations and connectivity analysis suggest they can be a source of the switchbacks and spikes observed by Parker Solar Probe.
description: Accepted for publication in Astronomy & Astrophysics
Multiple copy distillation and purification of phase diffused squeezed states
Creators: name: Marek, Petr
name: Fiurasek, Jaromir
name: Hage, Boris
name: Franzen, Alexander
name: DiGugliemo, James
name: Schnabel, Roman
Publisher: name: arXiv
Year: 2007
Subjects: subject: Quantum Physics (quant-ph)
subject: FOS: Physical sciences

description: We provide a detailed theoretical analysis of multiple copy purification and distillation protocols for phase diffused squeezed states of light. The standard iterative distillation protocol is generalized to a collective purification of an arbitrary number of N copies. We also derive a semi-analytical expression for the asymptotic limit of the iterative distillation and purification protocol and discuss its properties.
description: 11 pages, 13 figures
title: Affekte als sozial-relationales Phänomen medialer Kommunikation
title: Affekttheorien für die Medienforschung nutzbar machen
titleType: Subtitle
Creators: name: Lünenborg, Margreth
name: Maier, Tanja
name: Töpper, Claudia
Publisher: name: Freie Universität Berlin
Year: 2018
Subjects: subject: affects
subject: emotions
subject: audience and reception studies
subject: television analysis
subject: cultural media studies
subject: 300 Sozialwissenschaften

description: Zentrales Anliegen des Beitrags ist es, Affekttheorien für die empirische Anwendung in der Kommunikations- und Medienwissenschaft nutzbar zu machen. Dazu stellen wir zunächst zentra-le Stränge der Emotionsforschung in der Rezeptions- und Wirkungsforschung sowie der Medi-entextanalyse dar, klären die von ihnen verwendeten Begriffe und machen ihre Bezüge zur Af-fektforschung deutlich. Daran anschließend führen wir knapp in aktuelle affekttheoretische An-sätze ein, beginnend mit einer Rekonstruktion früher Auseinandersetzungen in den Cultural Stu-dies, und entwickeln schließlich ein Analysemodell, mit dem Affekte als sozial-relationale Phä-nomene der Medienkommunikation empirisch analysiert werden können. Zur Exemplifizierung beziehen wir uns primär auf das Medium Fernsehen als einem Modus audiovisueller Kommuni-kation. Diese Betrachtung erlaubt jedoch auch weiterführende Überlegungen zur Bedeutung affektiver Dynamiken zwischen Medientechnologien, -texten und ihren Nutzer_innen.
description: This article focuses on affect theories and their relevance for communication and media studies. Relying on the strength and potential of the different ‚affective turns’, we develop an empirical approach to analyze affect as a relational phenomenon within media communication. To begin with, we introduce key concepts of emotion in audience and reception studies and in textual media analyses. Thereby, we try to clarify their central understanding of emotion and affect and explain their reference to contemporary affect theory. Introducing central strands of current affect theory, we develop an analytical approach to be used for empirical studies of affect in communication and media studies. Our considerations will be exemplified by the case of television. Nevertheless, the analytical approach provides the possibility for further reflections on the significance of affective dynamics within audiovisual media. We argue for an understanding of the affective dynamics of current media saturated societies.
The Rotating Nuclear Star Cluster in NGC 4244
Creators: name: Seth, Anil C.
name: Blum, Robert D.
name: Bastian, Nate
name: Caldwell, Nelson
name: Debattista, Victor P.
name: Puzia, Thomas H.
Publisher: name: arXiv
Year: 2008
Subjects: subject: Astrophysics (astro-ph)
subject: FOS: Physical sciences

description: We present observations of the nuclear star cluster in the nearby edge-on spiral galaxy NGC 4244 using the Gemini Near-Infrared Integral Field Spectrograph (NIFS) with laser guide star adaptive optics. From a previous study of edge-on galaxies, this nuclear star cluster was found to be one of a sample of clusters that appear flattened along the plane of their host galaxies disks. Such clusters show evidence for multiple morphological components, with younger/bluer disk components and older/redder spheroidal components. Our new observations of NGC 4244 show clear rotation of 30 km/sec within the central 10 pc (0.5") of the cluster. The central velocity dispersion is found to be 28+/-2 km/sec. The multiple stellar populations inferred from the optical colors and spectra are seen as variations in the CO line strength in the NIFS spectra. The rotation is clearly detected even in the older, more spheroidal stellar component. We discuss evidence for similar structures and kinematics in the nuclear star clusters of other galaxies including M33 and the Milky Way. Our observations support two possible formation mechanisms: (1) episodic accretion of gas from the disk directly onto the nuclear star cluster, or (2) episodic accretion of young star clusters formed in the central part of the galaxy due to dynamical friction.
description: Accepted by ApJ. 7 page 5 figures
KICHIK BIZNES VA XUSUSIY TADBIRKORLIKNI IQTISODIYOTDA TUTGAN O'RNI
Creators: name: Boltayev, Telman
Publisher: name: Zenodo
Year: 2025

description: Ushbu maqolada ishida kichik biznes va xususiy tadbirkorlikni rivojlantirish bugungi rivojlanayotgan zamonda qanchalik muhum ekanligi haqida so‘z boradi. Kichik biznes va tadbirkorlikni davlat tomonidan tartibga solinishi tadbirkorlik faoliyatiga qaydarajada ahamiyatli ekanligiga oid birqancha xorij adabiyotlari ustida tahlil o‘tkazildi.