cometadata/datacite-rtg-text-other-reclassification-records huggingface dataset:
Hilbert series of modules over Lie algebroids
Creators: name: Källström, Rolf
name: Tadesse, Yohannes
Publisher: name: arXiv
Year: 2011
Subjects: subject: Commutative Algebra (math.AC)
subject: Complex Variables (math.CV)
subject: Representation Theory (math.RT)
subject: FOS: Mathematics
subject: 13N15

description: We consider modules $M$ over Lie algebroids ${\mathfrak g}_A$ which are of finite type over a local noetherian ring $A$. Using ideals $J\subset A$ such that ${\mathfrak g}_A \cdot J\subset J $ and the length $\ell_{{\mathfrak g}_A}(M/JM)< \infty$ we can define in a natural way the Hilbert series of $M$ with respect to the defining ideal $J$. This notion is in particular studied for modules over the Lie algebroid of $k$-linear derivations ${\mathfrak g}_A=T_{A/k}(I)$ that preserve an ideal $I\subset A$, for example when $A={\mathcal O}_n$, the ring of convergent power series. Hilbert series over Stanley-Reisner rings are also considered.
description: 42 pages. This is a substantial revision of the previous version
Emergent Phenomena in Anisotropic Photonics
Creators: name: Khan, Emroz
Publisher: name: Purdue University Graduate School
Year: 2023
Subjects: Nanophotonics

description: The degree of freedom brought about by breaking the directional symmetry of space through the use of anisotropic media finds applications in numerous photonic systems. Almost all these systems are based on physical principles that are generalized extensions of their isotropic counterparts, much in the same way an ellipse is related to a circle. However, as we show, there are examples where, in the presence of loss, disorder or even coupling to the measurement apparatus, emerges a completely new behavior which is qualitatively different from the isotropic case. In this work we study these emergent phenomena found in open anisotropic photonic systems.
 We demonstrate that open systems based on biaxial anisotropic medium can support exceptional points which are singularities in the parameter space of the system where the mode frequencies as well as the modes themselves coalesce. We also show that topological insulators, which are novel materials that behave as dielectric in the bulk but metallic in the surface and exhibit bianisotropy through the coupling of their electric and magnetic response, can emit thermal radiation that carries nonzero spin angular momentum. Next, after describing how the strong anisotropy of hyperbolic metamaterial can support electromagnetic fields propagating with high wavenumbers unbounded by the frequency, we show that a super-resolution imaging scheme based on such material is quite robust against substantial loss and disorder. Finally, we consider an example of an incoherent perfect absorber and show that loss and anisotropy in this case can work together to recover the ideal lossless limit for the absorbing performance. In addition to making new conceptual connections between photonics and other branches of science such as condensed matter physics, biotechnology and quantum mechanics, these new emergent phenomena are shown to have thermal, imaging and sensing applications.
The Energy-Momentum tensor on $Spin^c$ manifolds
Creators: name: Nakad, Roger
Publisher: name: arXiv
Year: 2010
Subjects: subject: Differential Geometry (math.DG)
subject: FOS: Mathematics
subject: 53C42, 53C27

description: On $Spin^c$ manifolds, we study the Energy-Momentum tensor associated with a spinor field. First, we give a spinorial Gauss type formula for oriented hypersurfaces of a $Spin^c$ manifold. Using the notion of generalized cylinders, we derive the variationnal formula for the Dirac operator under metric deformation and point out that the Energy-Momentum tensor appears naturally as the second fundamental form of an isometric immersion. Finally, we show that generalized $Spin^c$ Killing spinors for Codazzi Energy-Momentum tensor are restrictions of parallel spinors.
description: To appear in IJGMMP (International Journal of Geometric Methods in Modern Physics), 22 pages
Neubühl - Wollishofer Blog
Creators: name: Brändli, Sebastian
Publisher: name: Zentralbibliothek Zürich
Year: 2021
Subjects: subject: 690 Hausbau, Bauhandwerk
subject: Zürich-Wollishofen
subject: Genossenschaft
subject: Wohnsiedlung

description: Ein Blog zu Geschichte und Quartierleben des Zürcher Stadtquartiers Wollishofen auf wollipedia.ch. Mit Texten von Sebastian Brändli (SB) und Ansichtskarten aus der Sammlung von Markus Zimmermann (MZ).
Photocatalytic Arylation of Alkenes, Alkynes and Enones with Diazonium Salts
Creators: name: Schroll, Peter
name: Hari, Durga Prasad
name: König, Burkhard
Publisher: name: Universität Regensburg
Year: 2012
Subjects: subject: arylation reactions · diazonium salts ·photocatalysis · radicals · visible light
subject: 540 Chemie

description: Teaching old dogs new tricks: Visible light photoredox catalysis improves the classic Meerwein arylation protocol significantly and allows the light-controlled arylation of alkenes, alkynes and enones by diazonium salts.
Interplay of Conductance, Force, and Structural Change in Metallic Point Contacts
Creators: name: Ternes, Markus
name: González, César
name: Lutz, Christopher P.
name: Hapala, Prokop
name: Giessibl, Franz J.
name: Jelinek, Pavel
name: Heinrich, Andreas J.
Publisher: name: Universität Regensburg
Year: 2011
Subjects: subject: 530 Physik
subject: 73.22. f
subject: 73.63.Rt
subject: 74.55.+v

description: The coupling between two atomically sharp nanocontacts provides tunable access to a fundamental underlying interaction: the formation of the bond between two atoms as they are brought into contact. Here we report a detailed experimental and theoretical analysis of the relation between the chemical force and the tunneling current during bond formation in atom-scale metallic junctions and their dependence on distance, junction structure, and material. We found that the short-range force as well as the conductance in two prototypical metal junctions depend exponentially on the distance and that they have essentially the same exponents. In the transition regime between tunneling and point contact, large short-range forces generate structural relaxations which are concomitant with modifications of the surface electronic structure and the collapse of the tunneling barrier.
title: Статистика
Creators: name: ELS IPR BOOKS
Publisher: name: Санкт-Петербургский государственный университет промышленных технологий и дизайна
Year: 2024

description: Рассмотрены теоретические основы статистики: сущность, предмет, метод и задачи статистики; источники статистической информации; система государственной статистики в РФ; статистическое наблюдение: подготовка к проведению, виды, формы организации и способы; ошибки статистического наблюдения, их виды; статистическая сводка и группировка; статистические таблицы; ряды распределения: дискретные, интервальные; графическое представление распределений; абсолютные величины и относительные величины, их виды; средние величины, их виды; вариация признаков и причины ее порождающие; показатели вариации и их значение в статистике; выборочное статистическое исследование; понятие об индексах; ряды динамики; показатели ряда динамики. Предназначено для обучающихся по специальности 38.02.01 «Экономика и бухгалтерский учет (по отраслям), предпринимательство».
When is the set of embeddings finite up to isotopy?
Creators: name: Skopenkov, Mikhail
Publisher: name: arXiv
Year: 2011
Subjects: subject: Geometric Topology (math.GT)
subject: FOS: Mathematics
subject: 57R52, 57R40, 57R65

description: Given a manifold N and a number m, we study the following question: is the set of isotopy classes of embeddings N->S^m finite? In case when the manifold N is a sphere the answer was given by A. Haefliger in 1966. In case when the manifold N is a disjoint union of spheres the answer was given by D. Crowley, S. Ferry and the author in 2011. We consider the next natural case when N is a product of two spheres. In the following theorem, FCS(i,j) is a concrete subset of the integer lattice depending only on the parity of i and j which is defined in the paper. Theorem. Assume that m>2p+q+2 and m S^m is infinite if and only if either q+1 or p+q+1 is divisible by 4, or there exists a point (x,y) in the set FCS(m-p-q,m-q) such that (m-p-q-2)x+(m-q-2)y=m-3. Our approach is based on a group structure on the set of embeddings and a new exact sequence, which in some sense reduces the classification of embeddings S^p x S^q -> S^m to the classification of embeddings S^{p+q} |_| S^q -> S^m and D^p x S^q -> S^m. The latter classification problems are reduced to homotopy ones, which are solved rationally.
description: This is an improved version of the published paper. Minor correction: some details added to the proofs of Theorem 1.6 (Section `Exactness at E^m(S^p x S^q)') and Lemmas 3.2, 3.6, 3.8; two new subsections added at the end; overall exposition improved
Model inter-comparison for global high-resolution simulations (D1.2)
Creators: name: Duras, Julia
name: Ziemen, Florian
name: Spickermann, Dela
name: Biercamp, Joachim
name: Dueben, Peter
Publisher: name: Zenodo
Year: 2020
Subjects: ESiWACE2

description: The DYAMOND project (DYnamics of the Atmospheric general circulation Modeled On Non-hydrostatic Domains) is the first initiative for a model intercomparison of global storm resolving (km-scale) climate simulations. The analysis of these simulations helps advancing our understanding of the climate system and improving the next-generation of weather and climate models. At the same time, it forces us to optimise workflow for the processing of the huge amounts of data generated by the upcoming generation of storm resolving global models. ESiWACE supports the DYAMOND project by providing and developing infrastructures for production-mode configurations. As the community of DYAMOND includes partners outside the ESiWACE project, the DYAMOND website serves as a platform for sharing and comparing climate and weather models at highest-resolution. It provides specific information for participants of the intercomparison project but also general information for a broader audience. For an easy participation in the initiative, ESiWACE provides input data on the website. For provision and inter-comparison of of these high resolution data, ESiWACE supports the DYAMOND initiative with with storage and computing time resources of the Deutsches Klimarechenzentrum GmbH (DKRZ). For the current DYAMOND phase two limited disk space impels us to develop an attractive data library with a central point for data access. The ESiWACE DYAMOND team is closely involved in the discussions relating to the new hierarchical storage management and data workflow at DKRZ and contributes its unique experience in dealing with the output of storm-resolving simulations.
Scanning tunneling microscopy and spectroscopy of NaCl overlayers on the stepped Cu(311) surface: Experimental and theoretical study
Creators: name: Olsson, Fredrik E.
name: Persson, Mats
name: Repp, Jascha
name: Meyer, Gerhard
Publisher: name: Universität Regensburg
Year: 2005
Subjects: subject: 530 Physik

description: The physical properties of ultrathin NaCl overlayers on the stepped Cu(311) surface have been characterized using scanning tunneling microscopy (STM) and spectroscopy, and density-functional calculations. Simulations of STM images and differential conductance spectra were based on the Tersoff-Hamann approximation for tunneling with corrections for the modified tunneling barrier at larger voltages and calculated Kohn-Sham states. Characteristic features observed in the STM images can be directly related to calculated electronic and geometric properties of the overlayers. The measured apparent barrier heights for the mono-, bi-, and trilayers of NaCl and the corresponding adsorption-induced changes in the work function, as obtained from the distance dependence of the tunneling current, are well reproduced and explained by the calculated results. The measurements revealed a large reduction of the tunneling conductance in a large voltage range, resembling a band gap. However, the simulated spectrum showed that only the onset at positive sample voltages may be viewed as a valence-band edge, whereas the onset at negative voltages is caused by the drastic effect of the electric field from the tip on the tunneling barrier.
title:   An Intersectional Queer Case Study of Two Youth Organizations in a Rural Kentucky High School
Creators: name: Moser, Eric
Publisher: name: University of Kentucky Libraries
Year: 2023
Subjects: subject: FOS: Other agricultural sciences
valueUri: http://www.oecd.org/science/inno/38235147.pdf

description: Secondary schools in the United States are hostile environments for students in the queer community. Schools in rural communities often pose greater challenges for queer students with less access to affirming and accepting educators. Rural schools often offer school-based agricultural education (SBAE) and the National FFA Organization as opportunities for students. Both programs have been found as unwelcoming environments for underrepresented groups, with little known about the experiences of queer students. To address hostility toward queer youth, schools have implemented Genders and Sexualities Alliances (GSAs) as an opportunity to discuss queer topics and create safe spaces. This qualitative case study sought to share the intersectional lived experiences of students in the FFA and GSA and explain their experiences with school climate, rural communities, and the two youth organizations of interest. Findings depict a hostile school culture for queer students in the school due to a lack of administrative oversight and negative perceptions of the GSA in the school and community. Recommendations from this work include professional development for teachers, staff, administrators, and community members along with revisions to anti-bullying and dress code policies.
description: © 2023 Eric Michael Moser
Electrical networks and Lie theory
Creators: name: Lam, Thomas
name: Pylyavskyy, Pavlo
Publisher: name: arXiv
Year: 2011
Subjects: subject: Representation Theory (math.RT)
subject: Combinatorics (math.CO)
subject: FOS: Mathematics

description: We introduce a new class of "electrical" Lie groups. These Lie groups, or more precisely their nonnegative parts, act on the space of planar electrical networks via combinatorial operations previously studied by Curtis-Ingerman-Morrow. The corresponding electrical Lie algebras are obtained by deforming the Serre relations of a semisimple Lie algebra in a way suggested by the star-triangle transformation of electrical networks. Rather surprisingly, we show that the type A electrical Lie group is isomorphic to the symplectic group. The nonnegative part (EL_{2n})_{\geq 0} of the electrical Lie group is a rather precise analogue of the totally nonnegative subsemigroup (U_{n})_{\geq 0} of the unipotent subgroup of SL_{n}. We establish decomposition and parametrization results for (EL_{2n})_{\geq 0}, paralleling Lusztig's work in total nonnegativity, and work of Curtis-Ingerman-Morrow and de Verdière-Gitler-Vertigan for networks. Finally, we suggest a generalization of electrical Lie algebras to all Dynkin types.
description: 14 pages, 5 figures
Forces and frequency shifts in atomic-resolution dynamic-force microscopy
Creators: name: Giessibl, Franz J.
Publisher: name: Universität Regensburg
Year: 1997
Subjects: subject: 530 Physik

description: True atomic resolution in vacuum with a force microscope is now obtained routinely by using the frequency shift of an oscillating cantilever as the imaging signal. Here, a calculation is presented that relates the frequency shift to the forces between tip and sample for both large and small oscillation amplitudes. Also, the frequency versus distance data for van der Waals dominated tip-sample interactions is related to the geometry of the tip apex. Published frequency versus distance data are used to show that the apex of tips providing atomic resolution is faceted and not rounded. Further, an extended jump-to-contact criterion for large amplitudes is established.
Supplemental Material_AJP-Lung_T A Lilien
Creators: name: Lilien, Thijs
name: van Meenen, David
name: Schultz, Marcus
name: Bos, Lieuwe
name: Bem, Reinout
Publisher: name: figshare
Year: 2023
Subjects: Intensive care

description: Supplemental Content to Perspective Article:
 Hyperoxia-Induced Lung Injury in Acute Respiratory Distress Syndrome: What is its Relative Impact?
title: Virtual Learning Trends During the COVID-19 Pandemic - Policy Brief
Creators: name: Darling-Aduana, Jennifer
name: Sass, Tim
name: Woodyard, Henry
Publisher: name: Georgia Policy Labs
Year: 2021

description: The COVID-19 pandemic forced schools across the U.S. to switch to virtual learning. In this project, we studied trends in technology usage and virtual learning during fall 2020 in a metro-Atlanta district. Our analysis elucidates promising strategies and highlights areas for additional attention, which can help improve the effectiveness of virtual learning.
The economics of smallholders’ forestland-use decisions : implications for afforestation programs
Creators: name: Baker, Kahlil
Publisher: name: University of British Columbia
Year: 2017

description: The traditional discipline of forest economics has largely overlooked smallholders’ forestland-use decision-making process, which is perplexing given that they are the most numerous type of forest manager in the world. To address this gap, this thesis advances the literature on the economic decision-making context of smallholders’ forestland-use decisions. This advancement is critical to improving the design of smallholder afforestation programs. This research gap is addressed in this thesis through three research chapters. The first research chapter proposes a theoretical construct for modelling smallholders’ forestland-use decisions. The second research chapter assesses the relative contribution of smallholders’ preferences towards the non-market values of trees in their forestland-use decisions and psychometrically segments smallholders based on those preferences. The third research chapter describes and estimates a model of smallholders’ participation in tree product markets using a combination of smallholder-specific transaction costs, shadow prices and preferences. The first research chapter is theoretical whereas the second and third research chapters are empirical using data collected from a smallholder afforestation program in Nicaragua that is currently underway. For the last two research chapters, I conducted a total of 630 surveys and 1 818 discrete choice experiments with 210 smallholders over a 12-month period. My research findings suggest that smallholders’ forestland-use decisions are governed by very different principles than those proposed in much of the existing forest economics literature. My findings are best understood in an agricultural context of competing uses for household assets and interdependent consumption and production decisions. I argue that due to transaction costs, market prices are no longer representative of decision prices; rather these prices are shaped by both endogenous smallholder-specific preferences, and characteristics of the household, farm and landscape. Forest production strategies range from natural regeneration on uncultivated land to intensive management of the forest resource to produce market and non-market values. In the absence of profitable market opportunities, non-market values play a much more important role in smallholders’ forestland-use choices than previously believed. My research offers a new approach for analyzing smallholders’ forestland-use decisions and provides a new set of tools to better assess, design, and target smallholder afforestation program policies.
Hierarchical Modeling of Abundance in Closed Population Capture-Recapture Models Under Heterogeneity
Creators: name: Schofield, Matthew R.
name: Barker, Richard J.
Publisher: name: arXiv
Year: 2010
Subjects: subject: Applications (stat.AP)
subject: Computation (stat.CO)
subject: FOS: Computer and information sciences

description: Hierarchical modeling of abundance in space or time using closed-population mark-recapture under heterogeneity (model M$_{h}$) presents two challenges: (i) finding a flexible likelihood in which abundance appears as an explicit parameter and (ii) fitting the hierarchical model for abundance. The first challenge arises because abundance not only indexes the population size, it also determines the dimension of the capture probabilities in heterogeneity models. A common approach is to use data augmentation to include these capture probabilities directly into the likelihood and fit the model using Bayesian inference via Markov chain Monte Carlo (MCMC). Two such examples of this approach are (i) explicit trans-dimensional MCMC, and (ii) superpopulation data augmentation. The superpopulation approach has the advantage of simple specification that is easily implemented in BUGS and related software. However, it reparameterizes the model so that abundance is no longer included, except as a derived quantity. This is a drawback when hierarchical models for abundance, or related parameters, are desired. Here, we analytically compare the two approaches and show that they are more closely related than might appear superficially. We exploit this relationship to specify the model in a way that allows us to include abundance as a parameter and that facilitates hierarchical modeling using readily available software such as BUGS. We use this approach to model trends in grizzly bear abundance in Yellowstone National Park from 1986-1998.
Within- and between-language competition in adult second language learners: implications for language proficiency
Creators: name: Sarrett, McCall E.
name: Shea, Christine
name: McMurray, Bob
Publisher: name: Taylor & Francis
Year: 2021
Subjects: subject: Sociology
subject: FOS: Sociology
subject: 69999 Biological Sciences not elsewhere classified
subject: FOS: Biological sciences
subject: Developmental Biology
subject: Science Policy

description: Second language (L2) learners must not only acquire L2 knowledge (i.e. vocabulary and grammar), but they must also rapidly access this knowledge. In monolinguals, efficient spoken word recognition is accomplished via lexical competition, by which listeners activate a range of candidates that compete for recognition as the signal unfolds. We examined this in adult L2 learners, investigating lexical competition both amongst words of the L2, and between L2 and native language (L1) words. Adult L2 learners (N = 33) in their third semester of college Spanish completed a cross-linguistic Visual World Paradigm task to assess lexical activation, along with a proficiency assessment (LexTALE-Esp). L2 learners showed typical incremental processing activating both within-L2 and cross-linguistic competitors, similar to fluent bilinguals. Proficiency correlated with both the speed of activating the target (which prior work links to the developmental progression in L1) and the degree to which competition ultimately resolves (linked to robustness of the lexicon).
Comparison of force sensors for atomic force microscopy based on quartz tuning forks and length-extensional resonators
Creators: name: Giessibl, Franz J.
name: Pielmeier, Florian
name: Eguchi, Toyoaki
name: An, Toshu
name: Hasegawa, Yukio
Publisher: name: Universität Regensburg
Year: 2011
Subjects: subject: 530 Physik
subject: 68.37.Ps
subject: 07.79.Lh
subject: 34.20.-b

description: The force sensor is key to the performance of atomic force microscopy (AFM). Nowadays, most atomic force microscopes use micromachined force sensors made from silicon, but piezoelectric quartz sensors are being applied at an increasing rate, mainly in vacuum. These self-sensing force sensors allow a relatively easy upgrade of a scanning tunneling microscope to a combined scanning tunneling/atomic force microscope. Two fundamentally different types of quartz sensors have achieved atomic resolution: the “needle sensor,” which is based on a length-extensional resonator, and the “qPlus sensor,” which is based on a tuning fork. Here, we calculate and measure the noise characteristics of these sensors. We find four noise sources: deflection detector noise, thermal noise, oscillator noise, and thermal drift noise. We calculate the effect of these noise sources as a factor of sensor stiffness, bandwidth, and oscillation amplitude. We find that for self-sensing quartz sensors, the deflection detector noise is independent of sensor stiffness, while the remaining three noise sources increase strongly with sensor stiffness. Deflection detector noise increases with bandwidth to the power of 1.5, while thermal noise and oscillator noise are proportional to the square root of the bandwidth. Thermal drift noise, however, is inversely proportional to bandwidth. The first three noise sources are inversely proportional to amplitude while thermal drift noise is independent of the amplitude. Thus, we show that the earlier finding that quoted an optimal signal-to-noise ratio for oscillation amplitudes similar to the range of the forces is still correct when considering all four frequency noise contributions. Finally, we suggest how the signal-to-noise ratio of the sensors can be improved further, we briefly discuss the challenges of mounting tips, and we compare the noise performance of self-sensing quartz sensors and optically detected Si cantilevers.
title: Техническое исполнение проектов в материале. Пластические свойства тканей в дизайне костюма
Creators: name: ELS IPR BOOKS
Publisher: name: Санкт-Петербургский государственный университет промышленных технологий и дизайна
Year: 2024

description: Учебное пособие разработано в соответствии с требованиями Федерального государственного образовательного стандарта среднего профессионального образования. Даны рекомендации к выполнению практических заданий по дисциплине «Техническое исполнение художественно-конструкторских (дизайнерских) проектов в материале» для обучающихся по специальности 54.02.01 «Дизайн (по отраслям)». В учебном пособии рассматривается важный этап выполнения проектов материале – это выбор тканей для осуществления проектов моделей одежды в материале, даются рекомендации по использованию определенных видов тканей, исходя из их пластических свойств. Рассмотрен вопрос развития графических навыков, обучающихся при изображении того или иного вида тканей и материалов для одежды в эскизах костюма.
Semantic word integration in children with cochlear implants: electrophysiological evidence
Creators: name: Pierotti, Elizabeth
name: Coffey-Corina, Sharon
name: Schaefer, Tristan
name: Corina, David P.
Publisher: name: Taylor & Francis
Year: 2021
Subjects: subject: Medicine
subject: Neuroscience
subject: Physiology
subject: FOS: Biological sciences
subject: Sociology
subject: FOS: Sociology
subject: 69999 Biological Sciences not elsewhere classified
subject: Science Policy
subject: 111714 Mental Health
subject: FOS: Health sciences

description: Differential auditory experiences of children with hearing-loss who receive cochlear implants (CIs) may influence the integration of lexical and conceptual information. Here we measured event-related potentials during a word-picture priming task in CI-using children (n = 29, mean age = 81 months) and typically-hearing children (n = 19, mean age = 75 months) while they viewed audiovisual-word primes and picture targets that were semantically congruent or incongruent. In both groups, semantic relatedness modulated ERP amplitude 300–500 ms after picture onset, signifying an N400 semantic effect. Critically, the CI-using children’s responses to unrelated pairs were significantly more negative than hearing children’s responses. Group differences were mirrored in an earlier 150–275 ms time window associated with a P2 response. The present findings suggest attentional and/or strategic differences impact semantic processing and contribute to the N400 differences observed between groups.
title: Технология продвижения туристического продукта
Creators: name: ELS IPR BOOKS
Publisher: name: Санкт-Петербургский государственный университет промышленных технологий и дизайна
Year: 2024

description: В данном учебном пособии автор не только описывает традиционные маркетинговые инструменты, но и активно объясняет принципы использования актуальных цифровых сер-висов в продвижении туристского продукта. Логика изложения материала подразумевает переход от анализа общей специфики туристского продукта как объекта продвижения к изучению конкретных маркетинговых инструментов и оценке эффективности их использования. Учебное пособие состоит из четырех глав, списка использованных источников и словаря современных терминов цифрового маркетинга. Учебное пособие предназначено для студентов, обучающихся по специальности 43.02.10 «Туризм», соответствует рабочей программе дисциплины «Технология продаж и продвижения турпродукта», а также может быть использовано специалистами индустрии туризма и гостеприимства.
Minimal Lagrangian Surfaces in CH2 and Representations of Surface Groups into SU(2,1)
Creators: name: Loftin, John
name: McIntosh, Ian
Publisher: name: arXiv
Year: 2010
Subjects: subject: Differential Geometry (math.DG)
subject: Geometric Topology (math.GT)
subject: FOS: Mathematics
subject: 53C43, 20H10

description: We use an elliptic differential equation of Tzitzeica type to construct a minimal Lagrangian surface in CH2 from the data of a compact hyperbolic Riemann surface and a small holomorphic cubic differential. The minimal Lagrangian surface is invariant under an SU(2,1) action of the fundamental group. We further parameterise a neighborhood of the R-Fuchsian representations in the representation space by pairs consisting of a point in Teichmuller space and a small cubic differential. By constructing a fundamental domain, we show these representations are complex-hyperbolic quasi-Fuchsian, thus recovering a result of Guichard and Parker-Platis. Our proof involves using the Toda lattice framework to construct an SU(2,1) frame corresponding to a minimal Lagrangian surface. Then the equation of Tzitzeica type is an integrability condition. A very similar equation to ours governs minimal surfaces in hyperbolic 3-space, and our paper can be interpreted as an analog of the theory of minimal surfaces in quasi-Fuchsian manifolds, as first studied by Uhlenbeck.
description: 30 pp, published version; a constant corrected from previous version
title: Теплотехника целлюлозно-бумажного производства. Теоретические основы теплотехники
Creators: name: ELS IPR BOOKS
Publisher: name: Высшая школа технологии и энергетики, Санкт-Петербургский государственный университет промышленных технологий и дизайна
Year: 2017

description: В первой части пособия изложены основы технической термодинамики, теория тепло- и массообмена, топливо и теория горения. Во второй и третьей частях книги рассмотрены принципы работы теплоэнергетических и теплотехнологических установок целлюлозно-бумажного производства. Учебное пособие предназначено для студентов, обучающихся по направлению подготовки бакалавров и магистров 140100 «Теплотехника и теплоэнергетика», для всех форм обучения, а также для студентов неэнергетических специальностей.
Quantum-critical pairing with varying exponents
Creators: name: Moon, Eun-Gook
name: Chubukov, Andrey V.
Publisher: name: arXiv
Year: 2010
Subjects: subject: Superconductivity (cond-mat.supr-con)
subject: Strongly Correlated Electrons (cond-mat.str-el)
subject: FOS: Physical sciences

description: We analyse the onset temperature T_p for the pairing in cuprate superconductors at small doping, when tendency towards antiferromagnetism is strong. We consider the model of Moon and Sachdev (MS), which assumes that electron and hole pockets survive in a paramagnetic phase. Within this model, the pairing between fermions is mediated by a gauge boson, whose propagator remains massless in a paramagnet. We relate the MS model to a generic γ-model of quantum-critical pairing with the pairing kernel λ(Ω) \propto 1/Ω^γ. We show that, over some range of parameters, the MS model is equivalent to the γ-model with γ=1/3 (λ(Ω) \propto Ω^{-1/3}). We find, however, that the parameter range where this analogy works is bounded on both ends. At larger deviations from a magnetic phase, the MS model becomes equivalent to the γ-model with varying γ>1/3, whose value depends on the distance to a magnetic transition and approaches γ=1 deep in a paramagnetic phase. Very near the transition, the MS model becomes equivalent to the γ-model with varying γ<1/3. Right at the magnetic QCP, the MS model is equivalent to the γ-model with γ=0+ (λ(Ω) \propto \log Ω), which is the model for color superconductivity. Using this analogy, we verified the formula for T_c derived for color superconductivity.
description: 10 pages, 8 figures, submitted to JLTP for a focused issue on Quantum Phase Transitions
The radius anomaly in the planet/brown dwarf overlapping mass regime
Creators: name: Leconte, Jérémy
name: Chabrier, Gilles
name: Baraffe, Isabelle
name: Levrard, Benjamin
Publisher: name: arXiv
Year: 2010
Subjects: subject: Earth and Planetary Astrophysics (astro-ph.EP)
subject: FOS: Physical sciences

description: The recent detection of the transit of very massive substellar companions (CoRoT-3b, Deleuil et al. 2008; CoRoT-15b, Bouchy et al. 2010; WASP-30b, Anderson et al. 2010; Hat-P-20b, Bakos et al. 2010) provides a strong constraint to planet and brown dwarf formation and migration mechanisms. Whether these objects are brown dwarfs originating from the gravitational collapse of a dense molecular cloud that, at the same time, gave birth to the more massive stellar companion, or whether they are planets that formed through core accretion of solids in the protoplanetary disk can not always been determined unambiguously and the mechanisms responsible for their short orbital distances are not yet fully understood. In this contribution, we examine the possibility to constrain the nature of a massive substellar object from the various observables provided by the combination of Radial Velocity and Photometry measurements (e.g. M_p, R_p, M_s, Age, a, e...). In a second part, developments in the modeling of tidal evolution at high eccentricity and inclination - as measured for HD 80 606 with e=0.9337 (Naef et al. 2001), XO-3 with a stellar obliquity >37.3+-3.7 deg (Hébrard et al. 2008; Winn et al. 2009) and several other exoplanets - are discussed along with their implication in the understanding of the radius anomaly problem of extrasolar giant planets.
description: Proceedings of the conference: "Detection and dynamics of transiting exoplanets" held at the OHP, 23-27 August 2010. 7 pages, 3 figures
Multiple concussions and dual task paradigms : reactive postural perturbation management
Creators: name: Dierijck, Jillian Katrina
Publisher: name: University of British Columbia
Year: 2017

description: Sport-related concussion has received increasing concern and research in the last 20 years. Despite much research being done in the acute phase, chronic disturbances as a result of multiple concussions have received notably less attention. Moreover, these long-term difficulties as a result of multiple concussions have the capacity to influence the future of the athletes sporting career as well as their day-to-day functioning. Of particular interest is the impact of multiple concussions on balance. While studies of quiet stance balance are informative, they do not challenge the postural control system as contact sport game-play does. Therefore, the purpose of this study was to evaluate the influence of multiple previous concussions on the ability to manage external perturbations (analogous to pushes and tackles) under varying attentional demands. A group of contact-sport athletes who have never had a concussion (n=16) and a group of contact sport athletes who have been exposed to two or more concussions (n=16) were recruited. Participants completed a button press task, an arm reaching task with unexpected external perturbations, and both tasks simultaneously. A 2×2 mixed model ANOVA was used to assess for the main effects of task (single vs. dual) and concussion history (zero vs. two or more). Dependent variables included aspects of centre of pressure (COP; displacement and velocity), hand kinematics (displacement and velocity), and reaction time. Under dual-task conditions performance decreased on a number of variables including COP, hand kinematics, and reaction time. Moreover, the group with multiple previous concussions performed significantly worse, particularly in COP metrics compared to the group who have no concussion history. These findings indicate a history of concussion alters COP metrics (postural control). Furthermore, these findings highlight the potential use of this novel task (combining external perturbations and a secondary attention task) in concussion assessment and return-to-play decision making. Taken together, the current findings add crucial information to the impact of concussion on postural control. Given this information, interventions need to be designed and implemented to mitigate the chronic disturbances to balance (that could influence the future sporting career and day-to-day life) which may result from exposure to multiple concussions.
Treatment of immune thrombocytopenia (ITP) secondary to malignancy: a systematic review
Creators: name: Podda, Gian Marco
name: Fiorelli, Elisa M.
name: Birocchi, Simone
name: Rambaldi, Benedetta
name: Di Chio, Maria Chiara
name: Casazza, Giovanni
name: Cattaneo, Marco
Publisher: name: Taylor & Francis
Year: 2020
Subjects: subject: Medicine
subject: Pharmacology
subject: Ecology
subject: FOS: Biological sciences
subject: Immunology
subject: FOS: Clinical medicine
subject: Cancer
subject: 111714 Mental Health
subject: FOS: Health sciences

description: Immune thrombocytopenia (ITP) can be associated with lymphoproliferative diseases (LPD) or solid tumors. A systematic review of published literature was conducted to evaluate response to treatment of ITP secondary to malignancy. Primary outcome was overall response (complete response+response) to first-line treatments [steroids alone or in combination with intravenous immunoglobulins (IVIg)]. Among secondary outcomes, overall response to second-line treatments [splenectomy, rituximab or thrombopoietin receptor agonists (TPO-RA)] and death were evaluated. Of the retrieved 238 text articles, 108 were analyzable, for a total of 154 patients: 142 in 105 case reports and 12 in 3 observational studies. Thirty-nine patients had solid tumors, 114 LPD, and 1 both. The median follow up was 19 months (IQR, 9–40). The overall response was 50% (62% in solid tumors, 46% in LPD) after steroids and 47% (67% in solid tumors, 36% in LPD) after steroids+IVIg, which are lower than historical responses observed in primary ITP (≈80%). The overall responses to rituximab (used in LPD only), splenectomy and TPO-RA (70%, 73% and 92%, respectively) were similar to those observed in primary ITP. Seven patients (6%) died due to bleeding events. ITP secondary to malignancy appears to be associated with unsatisfactory response to first-line treatments.
Metastable states, quasi-stationary distributions and soft measures
Creators: name: Bianchi, Alessandra
name: Gaudillière, Alexandre
Publisher: name: arXiv
Year: 2011
Subjects: subject: Probability (math.PR)
subject: Statistical Mechanics (cond-mat.stat-mech)
subject: FOS: Mathematics
subject: FOS: Physical sciences

description: We establish metastability in the sense of Lebowitz and Penrose under practical and simple hypothesis for (families of) Markov chains on finite configuration space in some asymptotic regime, including the case of configuration space size going to infinity. By comparing restricted ensemble and quasi-stationary measures, we study point-wise convergence velocity of Yaglom limits and prove asymptotic exponential exit law. We introduce soft measures as interpolation between restricted ensemble and quasi-stationary measure to prove an asymptotic exponential transition law on a generally different time scale. By using potential theoretic tools, we prove a new general Poincaré inequality and give sharp estimates via two-sided variational principles on relaxation time as well as mean exit time and transition time. We also establish local thermalization on a shorter time scale and give mixing time asymptotics up to a constant factor through a two-sided variational principal. All our asymptotics are given with explicit quantitative bounds on the corrective terms.
description: 41 pages
Sharp oracle inequalities and slope heuristic for specification probabilities estimation in discrete random fields
Creators: name: Lerasle, Matthieu
name: Takahashi, Daniel Y.
Publisher: name: arXiv
Year: 2011
Subjects: subject: Statistics Theory (math.ST)
subject: FOS: Mathematics

description: We study the problem of estimating the one-point specification probabilities in non-necessary finite discrete random fields from partially observed independent samples. Our procedures are based on model selection by minimization of a penalized empirical criterion. The selected estimators satisfy sharp oracle inequalities in $L_2$-risk. We also obtain theoretical results on the slope heuristic for this problem, justifying the slope algorithm to calibrate the leading constant in the penalty. The practical performances of our methods are investigated in two simulation studies. We illustrate the usefulness of our approach by applying the methods to a multi-unit neuronal data from a rat hippocampus.
description: Published at http://dx.doi.org/10.3150/14-BEJ660 in the Bernoulli (http://isi.cbs.nl/bernoulli/) by the International Statistical Institute/Bernoulli Society (http://isi.cbs.nl/BS/bshome.htm)
The Local Field Potential Reflects Surplus Spike Synchrony
Creators: name: Denker, Michael
name: Roux, Sébastien
name: Lindén, Henrik
name: Diesmann, Markus
name: Riehle, Alexa
name: Grün, Sonja
Publisher: name: arXiv
Year: 2010
Subjects: subject: Neurons and Cognition (q-bio.NC)
subject: FOS: Biological sciences

description: The oscillatory nature of the cortical local field potential (LFP) is commonly interpreted as a reflection of synchronized network activity, but its relationship to observed transient coincident firing of neurons on the millisecond time-scale remains unclear. Here we present experimental evidence to reconcile the notions of synchrony at the level of neuronal spiking and at the mesoscopic scale. We demonstrate that only in time intervals of excess spike synchrony, coincident spikes are better entrained to the LFP than predicted by the locking of the individual spikes. This effect is enhanced in periods of large LFP amplitudes. A quantitative model explains the LFP dynamics by the orchestrated spiking activity in neuronal groups that contribute the observed surplus synchrony. From the correlation analysis, we infer that neurons participate in different constellations but contribute only a fraction of their spikes to temporally precise spike configurations, suggesting a dual coding scheme of rate and synchrony. This finding provides direct evidence for the hypothesized relation that precise spike synchrony constitutes a major temporally and spatially organized component of the LFP. Revealing that transient spike synchronization correlates not only with behavior, but with a mesoscopic brain signal corroborates its relevance in cortical processing.
description: 45 pages, 8 figures, 3 supplemental figures
Left ventricular assist device implantation causes platelet dysfunction and proinflammatory platelet-neutrophil interaction
Creators: name: Granja, Tiago
name: Magunia, Harry
name: Schüssel, Patricia
name: Fischer, Claudius
name: Prüfer, Thomas
name: Schibilsky, David
name: Serna-Higuita, Lina
name: Wendel, Hans Peter
name: Schlensak, Christian
name: Häberle, Helene
name: Rosenberger, Peter
name: Straub, Andreas
Publisher: name: Taylor & Francis
Year: 2020
Subjects: subject: Space Science
subject: Medicine
subject: Immunology
subject: FOS: Clinical medicine
subject: Marine Biology
subject: Cancer
subject: 111714 Mental Health
subject: FOS: Health sciences
subject: Hematology

description: Blood flow through left ventricular assist devices (LVAD) may induce activation and dysfunction of platelets. Dysfunctional platelets cause coagulation disturbances and form platelet-neutrophil conjugates (PNC), which contribute to inflammatory tissue damage. This prospective observational cohort study investigated patients, who underwent implantation of a LVAD (either HeartMate II (HM II) (n = 7) or HeartMate 3 (HM 3) (n = 6)) and as control patients undergoing coronary artery bypass grafting (CABG) and/or aortic valve replacement (AVR) (n = 10). We performed platelet and leukocyte flow cytometry, analysis of platelet activation markers, and platelet aggregometry. Platelet CD42b expression was reduced at baseline and perioperatively in HM II/3 compared to CABG/AVR patients. After surgery the platelet activation marker β-thromboglobulin and platelet microparticles increased in all groups while platelet aggregation decreased. Platelet aggregation was more significantly impaired in LVAD compared to CABG/AVR patients. PNC were higher in HM II compared to HM 3 patients. We conclude that LVAD implantation is associated with platelet dysfunction and proinflammatory platelet-leukocyte binding. These changes are less pronounced in patients treated with the newer generation LVAD HM 3. Future research should identify device-specific LVAD features, which are associated with the least amount of platelet activation to further improve LVAD therapy.
Integrating mathematics and science to explain socioscientific issues in educational comics for elementary school students
Creators: name: Abrori, Fadhlan Muchlas
name: Prodromou, Theodosia
name: Alagic, Mara
name: Livits, Reka
name: Kasti, Houssam
name: Lavicza, Zsolt
name: Anđić, Branko
Publisher: name: Taylor & Francis
Year: 2023
Subjects: Biochemistry
Biological Sciences not elsewhere classified
Developmental Biology
Science Policy

description: Integrating socioscientific issues (SSI) into education is gaining widespread adoption in classrooms due to its positive impact on student’s critical thinking, environmental awareness, holistic knowledge and/or the idea of combining science and mathematics. This paper explores the idea of using comics as appropriate media for elementary school students to engage with SSI content. Because of the difficulties in integrating SSI into classrooms, SSI-based learning is more commonly applied in high school and higher education settings, with limited implementation in earlier education. To answer this gap, we developed comics that have SSI content for elementary schools. Comics are chosen as reliable tools for visualising and simplifying complex concepts and making SSI content more accessible and engaging. This paper describes our comics on earthquake-related issues in Indonesia and the principles that guided its design. SSI inherently involves multiple perspectives, so the integration brings together science, and mathematics within the one comic. In integrating different disciplines of comic content, we utilised the rule-of-five framework, widely employed to merge five representational models (experiential, verbal, numerical, visual, and symbolic) commonly used in developing content combining two or more different academic disciplines.