cometadata/datacite-rtg-text-other-reclassification-records huggingface dataset:
Hydrogenation and dehydrogenation kinetics and catalysts for new hydrogen storage liquids
Creators: name: Sotoodeh, Farnaz
Publisher: name: University of British Columbia
Year: 2011

description: Due to the very low density of H₂, practical storage and recovery of H₂ has been a challenge in utilizing H₂ as an alternative fuel. Organic heteroaromatics have attracted interest because of their thermal stability and high storage capacity. In this study, H₂ storage and recovery from these compounds were investigated. The kinetics of the hydrogenation/dehydrogenation reactions was studied and DFT calculations were used to understand the dehydrogenation product distribution. The hydrogenation of N-ethylcarbazole and carbazole at 403-423 K on a supported Ru catalyst was well described by first-order kinetics. The hydrogenation of N-ethylcarbazole was significantly faster than the hydrogenation of carbazole, and >95 % selectivity to dodecahydro-N-ethylcarbazole and dodecahydrocarbazole was achieved, respectively. The dehydrogenation kinetics of dodecahydro-N-ethylcarbazole was studied at 101 kPa and 423-443 K over a Pd catalyst prepared by wet impregnation and calcination in air. The reactions followed first-order kinetics with 100 % conversion but only 69 % recovery of H₂ was achieved at 443 K, due to minimal selectivity to Nethylcarbazole. The complete recovery of H₂ from dodecahydro-N-ethylcarbazole was achieved at 443 K and 101 kPa using Pd/SiO₂ catalysts prepared by incipient wetness impregnation with calcination in He. The dehydrogenation TOF and selectivity to N-ethylcarbazole were dependent upon the Pd particle size. The effect of the N heteroatom on the dehydrogenation of polyaromatics was studied by comparison of dodecahydro-N-ethylcarbazole, dodecahydrocarbazole and dodecahydrofluorene dehydrogenation over Pd catalysts. The dehydrogenation of dodecahydro-N-ethylcarbazole and dodecahydrocarbazole were structure sensitive. The dehydrogenation rate of dodecahydrocarbazole was slower than dodecahydro-N-ethylcarbazole. Despite catalyst poisoning through the N atom in dodecahydrocarbazole, the N heteroatom was found to favor dehydrogenation, making heteroaromatics better candidates for H₂ storage than aromatics. The structure sensitivity of the reactions and the observed product distribution are explained in view of DFT calculations that showed that the adsorption of dodecahydro-N-ethylcarbazole on Pd required multiple catalytic sites and the heat of adsorption was dependent upon the surface structure. The effect of the ethyl group and the N heteroatom on the dehydrogenation rate of dodecahydro- N-ethylcarbazole was also investigated by comparing the adsorption energies of dodecahydro-N-ethylcarbazole with dodecahydrocarbazole and dodecahydrofluorene.
Parameterized Complexity of Weighted Multicut in Trees
Creators: name: Galby, Esther
name: Marx, Dániel
name: Schepper, Philipp
name: Sharma, Roohani
name: Tale, Prafullkumar
Publisher: name: CISPA
Year: 2023

description: The \textsc{Edge Multicut} problem is a classical cut problem where given an undirected graph $G$, a set of pairs of vertices $\mathcal{P}$, and a budget $k$, the goal is to determine if there is a set $S$ of at most $k$ edges such that for each $(s,t) \in \mathcal{P}$, $G-S$ has no path from $s$ to $t$. \textsc{Edge Multicut} has been relatively recently shown to be fixed-parameter tractable (FPT), parameterized by $k$, by Marx and Razgon [SICOMP 2014], and independently by Bousquet et al. [SICOMP 2018]. In the weighted version of the problem, called \textsc{Weighted Edge Multicut} one is additionally given a weight function $\texttt{wt} : E(G) \to \mathbb{N}$ and a weight bound $w$, and the goal is to determine if there is a solution of size at most $k$ and weight at most $w$. Both the FPT algorithms for \textsc{Edge Multicut} by Marx et al.\ and Bousquet et al.\ fail to generalize to the weighted setting. In fact, the weighted problem is non-trivial even on trees and determining whether \textsc{Weighted Edge Multicut} on trees is FPT was explicitly posed as an open problem by Bousquet et al.\ [STACS 2009]. In this article, we answer this question positively by designing an algorithm which uses a very recent result by Kim et al.\ [STOC 2022] about directed flow augmentation as subroutine. We also study a variant of this problem where there is no bound on the size of the solution, but the parameter is a structural property of the input, for example, the number of leaves of the tree. We strengthen our results by stating them for the more general vertex deletion version.
Estrategias de ensamblaje y anotación del genoma de Pseudomonas balearica
Creators: name: Salvà-Serra, Francisco
Publisher: name: figshare
Year: 2020
Subjects: subject: 60501 Bacteriology
subject: FOS: Biological sciences
subject: 60102 Bioinformatics
subject: FOS: Computer and information sciences
subject: 60408 Genomics
subject: Microbiology
subject: 60503 Microbial Genetics

description: Master thesis from the Master in Advanced Microbiology, University of the Balearica Islands, Palma de Mallorca, Spain. Year 2014.
NTRU-ν-um: Secure Fully Homomorphic Encryption from NTRU with Small Modulus
Creators: name: Kluczniak, Kamil
Publisher: name: CISPA
Year: 2023

description: NTRUEncrypt is one of the first lattice-based encryption schemes. Furthermore, the earliest fully homomorphic encryption (FHE) schemes rely on the NTRU problem. Currently, NTRU is one of the leading candidates in the NIST post-quantum standardization competition. What makes NTRU appealing is the age of the cryptosystem and relatively good performance. Unfortunately, FHE based on NTRU became impractical due to efficient attacks on NTRU instantiations with ``overstretched'' modulus. In particular, currently, NTRU-based FHE schemes to support a reasonable circuit depth require instantiating NTRU with a very large modulus. Breaking the NTRU problem for such large moduli turns out to be easy. Due to these attacks, any serious work on practical NTRU-based FHE essentially stopped. In this paper, we reactivate research on practical FHE that can be based on NTRU. We design an efficient bootstrapping scheme in which the noise growth is small enough to keep the modulus to dimension ratio relatively small, thus avoiding the negative consequences of ``overstretching'' the modulus. Our bootstrapping algorithm is an accumulator-type bootstrapping scheme analogous to AP/FHEW/TFHE. Finally, we show that we can use the bootstrapping procedure to compute any function over $\mathbb{Z}_t$. Consequently, we obtain one of the fastest FHE bootstrapping schemes able to compute any function over elements of a finite field alongside reducing the error.
title: Une gouvernance locale à l’épreuve du temps.
title: Politiques nationales, pouvoirs locaux et stratégies des miniers en Guinée
titleType: Subtitle
Creators: name: Rey, Pascal
Publisher: name: Stichproben - Wiener Zeitschrift für kritische Afrikastudien / Vienna Journal of African Studies
Year: 2016

description: L'affirmation selon laquelle les pouvoirs «traditionnels» auraient disparu sous Sékou Touré est symptomatique des rapports entre l’exercice du pouvoir central et les réalités locales en Guinée. L’entremêlement des pouvoirs déconcentrés, décentralisés et locaux depuis la période coloniale reflète la situation politique, économique et organisationnelle au niveau local. Dans le cadre de l’exercice des normes et droits aux échelles locales et nationales, l’arrivée de nombreuses multinationales minières vient superposer un nouveau niveau de normes. Entre respect du droit local, de la législation nationale et des normes internationales, les compagnies minières doivent composer avec une situation politique qui s’est forgée tout au long des différentes configurations de gouvernance en place en Guinée depuis la colonisation. Cet article propose une analyse de l’évolution de la gouvernance locale grâce à la compréhension des modes d’organisation et des rapports de force au niveau local et sa mise en perspective diachronique.
The atmospheric dispersion corrector for the Large Sky Area Multi--object Fibre Spectroscopic Telescope (LAMOST)
Creators: name: Su, Ding-qiang
name: Jia, Peng
name: Liu, Genrong
Publisher: name: arXiv
Year: 2011
Subjects: subject: Instrumentation and Methods for Astrophysics (astro-ph.IM)
subject: FOS: Physical sciences

description: The Large Sky Area Multi--object Fibre Spectroscopic Telescope (LAMOST) is the largest (aperture 4 m) wide field of view (FOV) telescope and is equipped with the largest amount (4000) of optical fibres in the world. For the LAMOST North and the LAMOST South the FOV are 5 deg and 3.5 deg, the linear diameters are 1.75 m and 1.22 m, respectively. A new kind of atmospheric dispersion corrector (ADC) is put forward and designed for LAMOST. It is a segmented lens which consists of many lens--prism strips. Although it is very big, its thickness is only 12 mm. Thus the difficulty of obtaining big optical glass is avoided, and the aberration caused by the ADC is small. Moving this segmented lens along the optical axis, the different dispersions can be obtained. The effects of ADC's slits on the diffraction energy distribution and on the obstruction of light are discussed. The aberration caused by ADC is calculated and discussed. All these results are acceptable. Such an ADC could also be used for other optical fibre spectroscopic telescopes, especially those which a have very large FOV.
description: 14 pages, 8 figures, Accepted for publication in MNRAS
Lockable Obfuscation from Circularly Insecure Fully Homomorphic Encryption
Creators: name: Kluczniak, Kamil
Publisher: name: CISPA
Year: 2023

description: In a lockable obfuscation scheme, a party called the obfuscator takes as input a circuit $\Circ$, a lock value $y$, and a message $m$, and outputs an obfuscated circuit. Given the obfuscated circuit, an evaluator can run it on an input $x$ and learn the message if $\Circ(x) = y$. For security, we require that the obfuscation reveals no information on the circuit as long as the lock $y$ has high entropy even given the circuit $\Circ$. The only known constructions of lockable obfuscation schemes require indistinguishability obfuscation ($\iO$) or the learning with errors (LWE) assumption. Furthermore, in terms of technique, all known constructions, excluding $\iO$-based, are build from provably secure variations of graph-induced multilinear maps. We show a generic construction of a lockable obfuscation scheme built from a (leveled) fully homomorphic encryption scheme that is circularly insecure. Specifically, we need a fully homomorphic encryption scheme that is secure under chosen-plaintext attack (IND-CPA) but for which there is an efficient cycle tester that can detect encrypted key cycles. Our finding sheds new light on how to construct lockable obfuscation schemes and shows why cycle tester constructions were helpful in the design of lockable obfuscation schemes. One of the many use cases for lockable obfuscation schemes are constructions for IND-CPA secure but circularly insecure encryption schemes. Our work shows that there is a connection in both ways between circular insecure encryption and lockable obfuscation.
title: «Il faut être là où l’or sort !»
title: De l’itinérance temporaire au maintien d’un mode de vie mobile chez les orpailleurs de Haute Guinée.
titleType: Subtitle
Creators: name: Bolay, Matthieu
Publisher: name: Stichproben - Wiener Zeitschrift für kritische Afrikastudien / Vienna Journal of African Studies
Year: 2016

description: Ce chapitre aborde l'extraction minière en Afrique de l'Ouest sous l'angle de la mobilité des chercheurs d'or. Il s'intéresse en particulier à l'émergence de modes de vies itinérants dans le secteur des mines d'or artisanales. Je défends l'idée que malgré les risques encourus et l'incertitude des revenus des mines, lors des premières années, les orpailleurs considèrent leur mode de vie itinérant comme une alternative viable aux moyens d'existence conventionnels, ainsi que comme une échappatoire aux trajectoires prescrites dans leurs contextes familiaux. Cependant, l'injonction à se maintenir en mobilité devient aussi une contrainte qui entre alors en contradiction avec les aspirations à se re-sédentariser. Je propose finalement trois types d'arrangements de mobilité au sein de la sphère domestique visant chacun à résoudre ces ambiguïtés en privilégiant soit la mobilité pour ne pas migrer, ou au contraire la migration pour limiter les déplacements.
The relation between preschoolers' attachement narratives and social/behavioural functioning
Creators: name: Gushnowski, Melanie L.
Publisher: name: University of Calgary
Year: 2007

description: Bibliography: p. 78-93
description: This study aimed to look at the relationship between attachment narratives and social and behavioural functioning, and replicate the findings of previous studies using the Attachment Doll Play tool. A total of 41 preschoolers were assessed using both the Attachment Doll Play and the Social Skills Rating System (SSRS). It was hypothesized that children classified as insecure would demonstrate higher levels of behaviour problems and children classified as secure would demonstrate higher levels of social skills. Results suggested significant support for these hypotheses. However, results of the study did not replicate the distributions reported in the original study using the Attachment Doll Play. The results of this study demonstrated that there is a significant relationship between attachment classifications and social skills and behaviour problems. However, more studies should be conducted to replicate previous findings and support the reliability of the Attachment Doll Play.
Feynman-like Rules for Calculating n-Point Correlators of the Primordial Curvature Perturbation
Creators: name: Valenzuela-Toledo, Cesar A.
name: Rodriguez, Yeinzon
name: Almeida, Juan P. Beltran
Publisher: name: arXiv
Year: 2011
Subjects: subject: Cosmology and Nongalactic Astrophysics (astro-ph.CO)
subject: General Relativity and Quantum Cosmology (gr-qc)
subject: High Energy Physics - Phenomenology (hep-ph)
subject: FOS: Physical sciences

description: A diagrammatic approach to calculate n-point correlators of the primordial curvature perturbation ζwas developed a few years ago following the spirit of the Feynman rules in Quantum Field Theory. The methodology is very useful and time-saving, as it is for the case of the Feynman rules in the particle physics context, but, unfortunately, is not very well known by the cosmology community. In the present work, we extend such an approach in order to include not only scalar field perturbations as the generators of ζ, but also vector field perturbations. The purpose is twofold: first, we would like the diagrammatic approach (which we would call the Feynman-like rules) to become widespread among the cosmology community; second, we intend to give an easy tool to formulate any correlator of ζfor those cases that involve vector field perturbations and that, therefore, may generate prolonged stages of anisotropic expansion and/or important levels of statistical anisotropy. Indeed, the usual way of formulating such correlators, using the Wick's theorem, may become very clutter and time-consuming.
description: LaTeX file, 26 pages. v2: A short discussion added regarding the role of the diagrams in high precision cosmology as well as in those cases where the loop contributions are larger than the tree level terms, generating large and observable levels of (anisotropic) non-gaussianity; references added, conclusions unchanged. v3: version to appear in Journal of Cosmology and Astroparticle Physics
Recovery phase of magnetic storms induced by different interplanetary drivers
Creators: name: Yermolaev, Yu. I.
name: Lodkina, I. G.
name: Nikolaeva, N. S.
name: Yermolaev, M. Yu.
Publisher: name: arXiv
Year: 2011
Subjects: subject: Space Physics (physics.space-ph)
subject: FOS: Physical sciences

description: Statistical analysis of Dst behaviour during recovery phase of magnetic storms induced by different types of interplanetary drivers is made on the basis of OMNI data in period 1976-2000. We study storms induced by ICMEs (including magnetic clouds (MC) and Ejecta) and both types of compressed regions: corotating interaction regions (CIR) and Sheaths. The shortest, moderate and longest durations of recovery phase are observed in ICME-, CIR-, and Sheath-induced storms, respectively. Recovery phases of strong ($Dst_{min} < -100$ nT) magnetic storms are well approximated by hyperbolic functions $Dst(t)= a/(1+t/τ_h)$ with constant $τ_h$ times for all types of drivers while for moderate ($-100 < Dst_{min} < -50$ nT) storms $Dst$ profile can not be approximated by hyperbolic function with constant $τ_h$ because hyperbolic time $τ_h$ increases with increasing time of recovery phase. Relation between duration and value $Dst_{min}$ for storms induced by ICME and Sheath has 2 parts: $Dst_{min}$ and duration correlate at small durations while they anticorrelate at large durations.
description: 18 pages, 4 figures, 2 tables, submitted to JGR special issue "Response of Geospace to High-Speed Streams"
Let History not Repeat Itself (this Time) - Tackling WebAuthn Developer Issues Early On
Creators: name: Alam, Aftab
name: Krombholz, Katharina
name: Bugiel, Sven
Publisher: name: CISPA
Year: 2023

description: The FIDO2 open authentication standard, developed jointly by the FIDO Alliance and the W3C, provides end-users with the means to use public-key cryptography in addition to or even instead of text-based passwords for authentication on the web. Its WebAuthn protocol has been adopted by all major browser vendors and recently also by major service providers (e.g., Google, GitHub, Dropbox, Microsoft, and others). Thus, FIDO2 is a very strong contender for finally tackling the problem of insecure user authentication on the web. However, there remain a number of open questions to be answered for FIDO2 to succeed as expected. In this poster, we focus specifically on the critical question of how well web-service developers can securely roll out WebAuthn in their own services and which issues have to be tackled to help developers in this task. The past has unfortunately shown that software developers struggle with correctly implementing or using security-critical APIs, such as TLS/SSL, password storage, or cryptographic APIs. We report here on ongoing work that investigates potential problem areas and concrete pitfalls for adopters of WebAuthn and tries to lay out a plan of how our community can help developers. We believe that raising awareness for foreseeable developer problems and calling for action to support developers early on is critical on the path for establishing FIDO2 as a de-facto authentication solution.
Magnon-drag thermopile
Creators: name: Costache, Marius V.
name: Bridoux, German
name: Neumann, Ingmar
name: Valenzuela, Sergio O.
Publisher: name: arXiv
Year: 2012
Subjects: subject: Materials Science (cond-mat.mtrl-sci)
subject: Mesoscale and Nanoscale Physics (cond-mat.mes-hall)
subject: FOS: Physical sciences

description: Thermoelectric effects in spintronics are gathering increasing attention as a means of managing heat in nanoscale structures and of controlling spin information by using heat flow. Thermal magnons (spin-wave quanta) are expected to play a major role, however, little is known about the underlying physical mechanisms involved. The reason is the lack of information about magnon interactions and of reliable methods to obtain it, in particular for electrical conductors because of the intricate influence of electrons. Here, we demonstrate a conceptually new device that allows us to gather information on magnon-electron scattering and magnon-drag effects. The device resembles a thermopile formed by a large number of pairs of ferromagnetic wires placed between a hot and a cold source and connected thermally in parallel and electrically in series. By controlling the relative orientation of the magnetization in pairs of wires, the magnon-drag can be studied independently of the electron and phonon-drag thermoelectric effects. Measurements as a function of temperature reveal the effect on magnon drag following a variation of magnon and phonon populations. This information is crucial to understand the physics of electron-magnon interactions, magnon dynamics and thermal spin transport.
description: 11 pages, 4 figures. Supplementary information available at http://www.nature.com/nmat/journal/v11/n3/full/nmat3201.html
Fria in Guinea: A Dismissed Bauxite Town
Creators: name: Knierzinger, Johannes
Publisher: name: Stichproben - Wiener Zeitschrift für kritische Afrikastudien / Vienna Journal of African Studies
Year: 2016

description: The article recounts the recent history of the bauxite town Fria, about 100 km north of the capital Conakry. From the late 1950s until 2012, Fria had been the only African producer of aluminum oxide, an intermediate product in the production of aluminum out of bauxite. During a strike in April 2012, the workers of Fria were locked out by the owner, Rusal, a Russian aluminum company, and since then the factory has not resumed production. The article discusses possible reasons for this lock-out and reports on the severe consequences for the population of Fria. It concludes that Rusal’s mode of operation is different from that of Western companies, but the long-term outcomes are not. This concerns the ongoing export of unprocessed bauxite (despite numerous promises to build refineries and smelters), the degradation of working and living conditions and the increased misuse of measures of corporate social responsibility.
Lignin model compound approach to modelling oxygen delignification reaction kinetics
Creators: name: Lee, Michael
Publisher: name: University of British Columbia
Year: 2011

description: The oxygen delignification stage is implemented in modern kraft pulp mills to cut the cost of producing bleached bright pulp and reduce emissions from the bleaching process. While several oxygen delignification kinetic models are presented in the literature, most models are derived from and limited to, specific pulp blends. In this work, an oxygen delignification kinetic model was developed based on lignin model compound chemistry found in the literature to create a universal kinetic model applicable to a range of pulp blends. The kinetic model splits the pulp into three reactive lignin groups (fast, slow and non-reacting) each with their own kinetic constants. Along with the starting kappa number, the proposed testing protocol measures kappa number from oxygen delignification experiments at 90°C for three hours (to determine non-reacting lignin fraction) and at 50°C for five minutes (to determine the fast lignin fraction). From the three kappa measurements, the fraction of each lignin group is determined and combined with their respective kinetic constants to create the overall kinetic model. Coupling separately developed mass transfer governing equations for the pulp suspension with the kinetic model, the overall oxygen delignification stage model was developed. The oxygen delignification model was compared with experiments performed both in the laboratory and in an industrial pulp mill. Laboratory oxygen delignification experiments on four pulp blends (three softwood and one hardwood) showed good agreement between experimental data and simulation values indicating the proposed testing protocol and kinetic constants are able to model the oxygen delignification reaction. In particular, oxygen delignification reaction result at 50°C for five minutes in conjunction with delignification result at 90°C for three hours was able to determine the split between fast, slow, and non-reacting lignin groups. Model simulations using the determined lignin fraction split was able to model experimental data especially well for 90°C experiments that mimics the conditions experienced in an industrial setting. Experiments at a pulp mill showed agreement within one kappa number between measured values and model simulations signifying the applicability of the proposed overall oxygen delignification model to simulate an industrial process.
Mixing dynamics of pulp suspensions in cylindrical vessels
Creators: name: Hui, Kwok Wai Leo
Publisher: name: University of British Columbia
Year: 2011

description: Cylindrical agitated chests are frequently used to facilitate manufacturing processes in pulp and paper industry and one of their main functions is to attenuate any process disturbances. However, owing to the inherited non-Newtonian nature of pulp suspensions, it is not easy to achieve complete mixing and with the improper chest design, these agitated chests do not always perform ideally or satisfactorily. The cavern formation in incomplete mixing may induce bypassing and dead zones, which significantly affect the chest performance. A study of cavern formation in a cylindrical agitated chest was thus carried out. Also, a dynamic model developed by Soltanzadeh et al. (2009) was used to quantify the mixing dynamics of the cylindrical chest. In addition, using computational fluid dynamics (CFD), the simulated results of the flow in the chest were compared with the experimental results to verify the applicability of the CFD model on the study of pulp suspension agitation. To investigate the cavern formation in a lab-scale cylindrical chest, electrical resistance tomography (ERT) and ultrasonic Doppler velocimetry (UDV) were applied to estimate the cavern shape and size. Both methods gave satisfactory results and as expected, the cavern size was found to increase with impeller speeds. The cavern shape was best described as a truncated right-circular cylinder. Based on this observation, a model considering the interaction between the cavern and chest walls was developed to calculate the cavern volume. With the dynamic model, a series of dynamic tests were carried out to characterize the mixing behavior of the lab-scale cylindrical chest. It was found that the proposed flow configuration with the outlet close to the cavern could minimize the bypassing which affects mixing quality. Also, ERT verified the presence of cavern and dead zone when the chest was not completely agitated in continuous-flow operation. Numerical simulations using CFD were compared with the experimental results under different operating conditions. Pulp suspensions are a mixture of water and wood fibres that can entangle each other to form flocs affecting the mixing flow. Owing to this complex rheology, it is not easy to model the agitation precisely in CFD using a homogeneous fluid model. The floc formation and air entrapment observed in experiments were difficult to be numerically taken into account in the simulations. Although the CFD model could not exactly predict the mixing situation of pulp suspensions, it still can be used to estimate the mixing flow patterns, e.g., flow directions, in the proposed chest designs.
Exact solutions of the Swift-Hohenberg equation with dispersion
Creators: name: Kudryashov, Nikolay A.
name: Sinelshchikov, Dmitry I.
Publisher: name: arXiv
Year: 2011
Subjects: subject: Pattern Formation and Solitons (nlin.PS)
subject: FOS: Physical sciences

description: The Swift-Hohenberg equation with dispersion is considered. Traveling wave solutions of the Swift-Hohenberg equation with dispersion are presented. The classification of these solutions is given. It is shown that the Swift-Hohenberg equation without dispersion has only stationary meromorphic solution.
simFIDO: FIDO2 User Authentication with simTPM
Creators: name: Chakraborty, Dhiman
name: Bugiel, Sven
Publisher: name: CISPA
Year: 2023

description: WebAuthn as part of FIDO2 is a new standard for two-factor and even password-less user authentication to web-services. Leading browsers, like Google Chrome, Microsoft Edge, and Mozilla Firefox, support the WebAuthn API. Unfortunately, the availability of hardware authenticators that support FIDO2 authentication is still focused heavily on desktop computers, while for mobile devices, only a limited choice of suitable authenticators is available to users (few roaming authenticators with wireless connectivity and even fewer built-in platform authenticators on mobile devices). This creates a void for users, in particular users of older device generations that lack platform authenticators and the right connectivity, to authenticate themselves with WebAuthn to web-services. In this poster, we present the idea of simFIDO, a FIDO2 setup using a recently developed simTPM as (platform) authenticator for mobile devices and even as roaming authenticator offered by mobile devices to connected computers. The move-ability property of the key storage of simTPM makes the users’ lives easier for credential portability between devices. In particular, a seamless integration of simTPM with non-mobile devices through phones will help to create a kind of universal authentication setup using FIDO2. Although we present the concrete design and implementation of a SIM card-based FIDO2 authenticator, we hope this poster will contribute to the discussion about how and in which form hardware authenticators can be made available to users.
Synaptic zinc and focal ischemic brain injury
Creators: name: Galasso, Sherri L.
Publisher: name: University of Calgary
Year: 2007

description: Bibliography: p. 175-203
description: Mounting evidence suggests that zinc, which can function both as a signalling mediator and a neurotoxin, is implicated in cerebral ischemia. To this effect, we investigated the specific role of synaptic vesicle zinc in acute focal ischemia by assessing the degree of intracellular zinc accumulation and neuronal degeneration in mice lacking synaptic zinc (ZnT-3 knockout). We found no significant differences in infarct volumes between adult male or female knockout, heterozygous, and wild-type mice. In addition, the time course of intracellular zinc accumulation was the same for all genotypes. Zinc was first detected at 6 hours and continued to be present for 2 weeks post-stroke. We conclude that intracellular zinc accumulation and cellular degeneration following focal ischemia occurs independent of the presence of synaptic zinc. As such, controlling the mobilization of zinc from intracellular stores may be more therapeutically advantageous than modulating synaptic zinc levels.
Epidermal growth factor-receptor induced synapse formation between lymnaea neurons
Creators: name: Gagatek, Jessics
Publisher: name: University of Calgary
Year: 2007

description: Bibliography: p. 128-139
description: Some pages are in colour.
description: Trophic factors are well known for their role in cell proliferation, differentiation, survival, neurite outgrowth, and more recently, in synapse formation and synaptic plasticity (Hamakawa et al., 1999). Despite their well defined roles during development, relatively little is known about the underlying cellular and molecular mechanisms governing their actions. In this study, 1 investigated the precise role of the invertebrate trophic factor, Lymnaea epidermal growth factor (L-EGF) and its receptor, L-EGFR, in mediating excitatory synapse fonnation between identified neurons visceral dorsal 4 (VD4) and its postsynaptic partner left pedal dorsal 1 (LPeDl). The data presented here show that L-EGF mimics brain-derived conditioned medium's (CM) ability to promote excitatory synapse formation between specific synaptic partners. Through pharmacological and molecular perturbations of the L-EGFR, I further demonstrated that the L-EGF-induced effects on synapse fonnation are mediated through the L-EGFR. Vertebrate EGF and its structural homologue, transforming growth factor-a (TGF-a), also promoted excitatory synapse formation between identified Lymnaea neurons, and these effects also appeared to be mediated through the L-EGF receptor. The fact that only L­EGF or its vertebrate homologues could signal through the L-EGFR suggests that this receptor is highly specific and is conserved among both vertebrate and invertebrate species. The Lymnaea soma-soma model thus provides an unparalleled opportunity to elucidate further molecular mechanisms by which trophic factors affect synapse formation.
The relationship between peer harassment and academic achievement in Canadian adolescents: a study of related individual, family and school factors
Creators: name: Gaber, Jaime
Publisher: name: University of Calgary
Year: 2007

description: Bibliography: p. 89-107
description: The association between peer harassment and academic achievement was examined in relation to individual, parent and teacher factors. The sample consisted of 4,293 adolescents aged 12-15 years drawn from the National Longitudinal Survey of Children and Youth (NLSCY), which is a national stratified sample of households across all provinces in Canada. To analyze the data, numerous variables in the 1'-JLSCY \Vere correlated with harassment and achievement. Gender comparisons using analyses of variance showed that male and female students experience similar rates of harassment. In addition, achievement levels were found to be similar for male and female students in the areas of Language Arts and Math. Latent constructs were derived from measured variables and a latent variable path analysis was conducted to test the model of harassment and achievement. Results showed that the data fit the model well: x2 (63) = 1196.72, p < .001 with a residual error of .03, and comparative fit index of .92. These results suggest that adolescents who are harassed by their peers are at risk for experiencing poor school achievement if they exhibit disruptive behavior problems, as well as have parents who provide little nurturance and show rejection, and whose teachers provide little support. Limitations of the current study and directions for future research are discussed. Finally, this paper concludes with an overview of the implications of the findings for school psychologists.
Debugging Inputs
Creators: name: Kirschner, Lukas
name: Soremekun, Ezekiel
name: Zeller, Andreas
Publisher: name: CISPA
Year: 2023

description: Program failures are often caused by invalid inputs, for instance due to input corruption. To obtain the passing input, one needs to debug the data. In this paper we present a generic technique called ddmax that (1) identifies which parts of the input data prevent processing, and (2) recovers as much of the (valuable) input data as possible. To the best of our knowledge, ddmax is the first approach that fixes faults in the input data without requiring program analysis. In our evaluation, ddmax repaired about 69% of input files and recovered about 78% of data within one minute per input.
The effect of orbital evolution on the Haumea (2003 EL61) collisional family
Creators: name: Volk, Kathryn
name: Malhotra, Renu
Publisher: name: arXiv
Year: 2012
Subjects: subject: Earth and Planetary Astrophysics (astro-ph.EP)
subject: FOS: Physical sciences

description: The Haumea family is currently the only identified collisional family in the Kuiper belt. We numerically simulate the long-term dynamical evolution of the family to estimate a lower limit of the family's age and to assess how the population of the family and its dynamical clustering are preserved over Gyr timescales. We find that the family is not younger than 100 Myr, and its age is at least 1 Gyr with 95% confidence. We find that for initial velocity dispersions of 50-400 m/s, approximately 20-45% of the family members are lost to close encounters with Neptune after 3.5 Gyr of orbital evolution. We apply these loss rates to two proposed models for the formation of the Haumea family, a graze-and-merge type collision between two similarly sized, differentiated KBOs or the collisional disruption of a satellite orbiting Haumea. For the graze-and-merge collision model, we calculate that >85% of the expected mass in surviving family members within 150 m/s of the collision has been identified, but that one to two times the mass of the known family members remains to be identified at larger velocities. For the satellite-break-up model, we estimate that the currently identified family members account for ~50% of the expected mass of the family. Taking observational incompleteness into account, the observed number of Haumea family members is consistent with either formation scenario at the 1 sigma level, however both models predict more objects at larger relative velocities (>150 m/s) than have been identified.
description: 25 pages, accepted to Icarus
Widespread spin polarization effects in photoemission from topological insulators
Creators: name: Jozwiak, Chris
name: Chen, Yulin
name: Fedorov, Alexei V.
name: Analytis, James G.
name: Rotundu, Costel R.
name: Schmid, Andreas K.
name: Denlinger, Jonathan D.
name: Chuang, Yi-De
name: Lee, Dung-Hai
name: Fisher, Ian R.
name: Birgeneau, R. J.
name: Shen, Zhi-Xun
name: Hussain, Zahid
name: Lanzara, Alessandra
Publisher: name: arXiv
Year: 2011
Subjects: subject: Materials Science (cond-mat.mtrl-sci)
subject: FOS: Physical sciences

description: High resolution spin- and angle-resolved photoemission spectroscopy (spin-ARPES) was performed on the three-dimensional topological insulator Bi$_2$Se$_3$ using a recently developed high-efficiency spectrometer. The topological surface state's helical spin structure is observed, in agreement with theoretical prediction. Spin textures of both chiralities, at energies above and below the Dirac point, are observed, and the spin structure is found to persist at room temperature. The measurements reveal additional unexpected spin polarization effects, which also originate from the spin-orbit interaction, but are well differentiated from topological physics by contrasting momentum and photon energy and polarization dependencies. These observations demonstrate significant deviations of photoelectron and quasiparticle spin polarizations. Our findings illustrate the inherent complexity of spin-resolved ARPES and demonstrate key considerations for interpreting experimental results.
description: 10 pages, 6 figures
Memory Safety Preservation for WebAssembly
Creators: name: Vassena, Marco
name: Patrignani, Marco
Publisher: name: CISPA
Year: 2023

description: WebAssembly (Wasm) is a next-generation portable compilation target for deploying applications written in high-level languages on the web. In order to protect their memory from untrusted code, web browser engines confine the execution of compiled Wasm programs in a memory-safe sandbox. Unfortunately, classic memory-safety vulnerabilities (e.g., buffer overflows and use-after-free) can still corrupt the memory within the sandbox and allow Wasm code to mount severe attacks. To prevent these attacks, we study a class of secure compilers that eliminate (different kinds of) of memory safety violations. Following a rigorous approach, we discuss memory safety in terms of hypersafety properties, which let us identify suitable secure compilation criteria for memory-safety-preserving compilers. We conjecture that, barring some restrictions at module boundaries, the existing security mechanisms of Wasm may suffice to enforce memory-safety preservation, in the short term. In the long term, we observe that certain features proposed in the design of a memory-safe variant of Wasm could allow compilers to lift these restrictions and enforce relaxed forms of memory safety.
ZAKβ is activated by cellular compression and mediates contraction-induced MAP kinase signaling in skeletal muscle.
Creators: name: Nordgaard, Cathrine
name: Vind, Anna Constance
name: Stonadge, Amy
name: Kjøbsted, Rasmus
name: Snieckute, Goda
name: Antas, Pedro
name: Blasius, Melanie
name: Reinert, Marie Sofie
name: Del Val, Ana Martinez
name: Bekker-Jensen, Dorte Breinholdt
name: Haahr, Peter
name: Miroshnikova, Yekaterina A
name: Mazouzi, Abdelghani
name: Falk, Sarah
name: Perrier-Groult, Emeline
name: Tiedje, Christopher
name: Li, Xiang
name: Jakobsen, Jens Rithamer
name: Jørgensen, Nicolas Oldenburg
name: Wojtaszewski, Jørgen FP
name: Mallein-Gerin, Frederic
name: Andersen, Jesper Løvind
name: Pennisi, Cristian Pablo
name: Clemmensen, Christoffer
name: Kassem, Moustapha
name: Jafari, Abbas
name: Brummelkamp, Thijn
name: Li, Vivian SW
name: Wickström, Sara A
name: Olsen, Jesper Velgaard
name: Blanco, Gonzalo
name: Bekker-Jensen, Simon
Publisher: name: The Francis Crick Institute
Year: 2022
Subjects: classificationCode: Tumour Biology
subject: Tumour Biology
classificationCode: Signalling & Oncogenes
subject: Signalling & Oncogenes
classificationCode: Developmental Biology
subject: Developmental Biology
classificationCode: Human Biology & Physiology
subject: Human Biology & Physiology
classificationCode: Stem Cells
subject: Stem Cells

description: Mechanical inputs give rise to p38 and JNK activation, which mediate adaptive physiological responses in various tissues. In skeletal muscle, contraction-induced p38 and JNK signaling ensure adaptation to exercise, muscle repair, and hypertrophy. However, the mechanisms by which muscle fibers sense mechanical load to activate this signaling have remained elusive. Here, we show that the upstream MAP3K ZAKβ is activated by cellular compression induced by osmotic shock and cyclic compression in vitro, and muscle contraction in vivo. This function relies on ZAKβ's ability to recognize stress fibers in cells and Z-discs in muscle fibers when mechanically perturbed. Consequently, ZAK-deficient mice present with skeletal muscle defects characterized by fibers with centralized nuclei and progressive adaptation towards a slower myosin profile. Our results highlight how cells in general respond to mechanical compressive load and how mechanical forces generated during muscle contraction are translated into MAP kinase signaling.
Separating intrinsic alignment and galaxy-galaxy lensing
Creators: name: Blazek, Jonathan
name: Mandelbaum, Rachel
name: Seljak, Uros
name: Nakajima, Reiko
Publisher: name: arXiv
Year: 2012
Subjects: subject: Cosmology and Nongalactic Astrophysics (astro-ph.CO)
subject: FOS: Physical sciences

description: The coherent physical alignment of galaxies is an important systematic for gravitational lensing studies as well as a probe of the physical mechanisms involved in galaxy formation and evolution. We develop a formalism for treating this intrinsic alignment (IA) in the context of galaxy-galaxy lensing and present an improved method for measuring IA contamination, which can arise when sources physically associated with the lens are placed behind the lens due to photometric redshift scatter. We apply the technique to recent Sloan Digital Sky Survey (SDSS) measurements of Luminous Red Galaxy lenses and typical (L*) source galaxies with photometric redshifts selected from the SDSS imaging data. Compared to previous measurements, this method has the advantage of being fully self-consistent in its treatment of the IA and lensing signals, solving for the two simultaneously. We find an IA signal consistent with zero, placing tight constraints on both the magnitude of the IA effect and its potential contamination to the lensing signal. While these constraints depend on source selection and redshift quality, the method can be applied to any measurement that uses photometric redshifts. We obtain a model-independent upper-limit of roughly 10% IA contamination for projected separations of approximately 0.1-100 Mpc/h. With more stringent photo-z cuts and reasonable assumptions about the physics of intrinsic alignments, this upper limit is reduced to 1-2%. These limits are well below the statistical error of the current lensing measurements. Our results suggest that IA will not present intractable challenges to the next generation of galaxy-galaxy lensing experiments, and the methods presented here should continue to aid in our understanding of alignment processes and in the removal of IA from the lensing signal.
description: 31 pages, 8 Figures. Minor changes to reflect published version
Taraxacum alatum H. Lindb.
Creators: name: Uhlemann, Ingo
Publisher: name: Zenodo
Year: 2011
Subjects: Biodiversity
Taxonomy
Plantae
Tracheophyta
Magnoliopsida
Asterales
Asteraceae
Taraxacum
Taraxacum alatum

description: Taraxacum alatum H. Lindb.,
Acta Soc. Fauna Fl. Fenn. 29 (9): 9, 20 (1908) –
Abb. 10 B.
 Österreich, Oberösterreich: Ortschaft Mondsee, Straße am Verbrauchermarkt nahe der Autobahnauffahrt, 14.4.2007, leg. Uhlemann (Hb. DR, WU). — Linz, nördlicher Stadtrand, Gewerbegebiet an der Straße nach Freistadt, 18. 4. 2009, leg. Uhlemann (Hb. DR).
 Österreich, Kärnten: St. Veit an der Glan, ruderalisierter Rasen gegenüber dem Bahnhof, 11.4. 2009, leg. Uhlemann (Hb. DR).
 Taraxacum alatum besitzt unberandete, zurückgebogene äußere Involukralblätter mit nach außen gebogenen Spitzen, grüne, geflügelte Blattstiele (Artepitheton!) und kurze, dreieckige Blattseitenlappen, die meist einen großen Zahn auf der Oberkante tragen. Diese seit dem Beginn des 20. Jahrhunderts bekannte und damit „klassische“ Art wurde aus Finnland (Helsinki) beschrieben und hat eine weite Verbreitung in Nord- und Mitteleuropa, wohl einschließlich Österreichs.
description: Published as part of Uhlemann, Ingo, 2011, Notizen zur Taraxacum-Flora Österreichs und Südtirols, pp. 27-53 in Neilreichia 6 on page 48, DOI: 10.5281/zenodo.303107
Efficient Multiplex Genome Editing Tools Identified by Protoplast Technology in Phalaenopsis
Creators: name: 徐, 晓静
Publisher: name: CNGB
Year: 2021
Subjects: Raw sequence reads
Variation
Multiisolate

description: Here we established a seedling-leaf protoplast-based platform to identify functional and efficient multiplex genome editing systems for Phalaenopsis. Our data indicated that: (ⅰ) tRNA-based multiplex genome editing tool was effective in Phalaenopsis; (ⅱ) optimizing the sgRNA structure could further improve the efficiency of the tRNA-based multiplex genome editing tools in Phalaenopsis; (ⅲ) dual Pol II promoter-Cpf1 multiplex genome editing system was also functional in Phalaenopsis. The newly established protoplast platform and the multiplex genome editing tools for Phalaenopsis, have great application potentials in rapidly constructing large-scale mutant libraries of orchid and speeding up orchid precise breeding in the future.
Renormalization of interactions of ultracold atoms in simulated Rashba gauge fields
Creators: name: Ozawa, Tomoki
name: Baym, Gordon
Publisher: name: arXiv
Year: 2011
Subjects: subject: Quantum Gases (cond-mat.quant-gas)
subject: FOS: Physical sciences

description: Interactions of ultracold atoms with Rashba spin-orbit coupling, currently being studied with simulated (artificial) gauge fields, have nontrivial ultraviolet and infrared behavior. Examining the ultraviolet structure of the Bethe-Salpeter equation, we show that the linear ultraviolet divergence in the bare interaction can be renormalized as usual in terms of low-energy scattering lengths, and that for both bosons and fermions ultraviolet logarithmic divergences are absent. Calculating the leading order effective interaction with full dependence on the spin-orbit coupling strength and the center-of-mass momentum of the colliding pair, we elucidate the relation between mean-field interactions and physical three-dimensional scattering lengths. As a consequence of infrared logarithmic divergences in the two-particle propagator, the effective interaction vanishes as the center-of-mass momentum approaches zero.
description: 4 pages, 2 figures, published version