cometadata/datacite-rtg-text-other-reclassification-records huggingface dataset:
In-vivo magnetic resonance imaging of hyperpolarized silicon particles
Creators: name: Cassidy, M. C.
name: Chan, H. R.
name: Ross, B. D.
name: Bhattacharya, P. K.
name: Marcus, C. M.
Publisher: name: arXiv
Year: 2013
Subjects: subject: Mesoscale and Nanoscale Physics (cond-mat.mes-hall)
subject: Materials Science (cond-mat.mtrl-sci)
subject: Medical Physics (physics.med-ph)
subject: FOS: Physical sciences

description: Silicon-based micro and nanoparticles have gained popularity in a wide range of biomedical applications due to their biocompatibility and biodegradability in-vivo, as well as a flexible surface chemistry, which allows drug loading, functionalization and targeting. Here we report direct in-vivo imaging of hyperpolarized 29Si nuclei in silicon microparticles by MRI. Natural physical properties of silicon provide surface electronic states for dynamic nuclear polarization (DNP), extremely long depolarization times, insensitivity to the in-vivo environment or particle tumbling, and surfaces favorable for functionalization. Potential applications to gastrointestinal, intravascular, and tumor perfusion imaging at sub-picomolar concentrations are presented. These results demonstrate a new background-free imaging modality applicable to a range of inexpensive, readily available, and biocompatible Si particles.
description: Supplemental Material included
Building a biomedical tokenizer using the token lattice design pattern and the adapted Viterbi algorithm
Creators: name: Weber-Jahnke, Jens
name: Barrett, Neil
Publisher: name: BioMed Central Ltd
Year: 2011

description: Abstract: Background: Tokenization is an important component of language processing yet there is no widely accepted tokenization method for English texts, including biomedical texts. Other than rule based techniques, tokenization in the biomedical domain has been regarded as a classification task. Biomedical classifier-based tokenizers either split or join textual objects through classification to form tokens. The idiosyncratic nature of each biomedical tokenizer’s output complicates adoption and reuse. Furthermore, biomedical tokenizers generally lack guidance on how to apply an existing tokenizer to a new domain (subdomain). We identify and complete a novel tokenizer design pattern and suggest a systematic approach to tokenizer creation. We implement a tokenizer based on our design pattern that combines regular expressions and machine learning. Our machine learning approach differs from the previous split-join classification approaches. We evaluate our approach against three other tokenizers on the task of tokenizing biomedical text. Results: Medpost and our adapted Viterbi tokenizer performed best with a 92.9% and 92.4% accuracy respectively. Conclusions: Our evaluation of our design pattern and guidelines supports our claim that the design pattern and guidelines are a viable approach to tokenizer construction (producing tokenizers matching leading custom-built tokenizers in a particular domain). Our evaluation also demonstrates that ambiguous tokenizations can be disambiguated through POS tagging. In doing so, POS tag sequences and training data have a significant impact on proper text tokenization.
Superlattice structures in twisted bilayers of folded graphene
Creators: name: Schmidt, Hennrik
name: Rode, Johannes C.
name: Smirnov, Dmitri
name: Haug, Rolf J.
Publisher: name: London : Nature Publishing Group
Year: 2014
Subjects: subject: graphene
subject: atomic force microscopy
subject: carbon
subject: crystal structure
subject: geometry
subject: numerical model
subject: Article
subject: bilayer membrane
subject: magnetic field
subject: measurement
subject: scanning probe microscopy
subject: Dewey Decimal Classification::500 | Naturwissenschaften::510 | Mathematik
subject: Dewey Decimal Classification::500 | Naturwissenschaften::530 | Physik

description: The electronic properties of bilayer graphene strongly depend on relative orientation of the two atomic lattices. Whereas Bernal-stacked graphene is most commonly studied, a rotational mismatch between layers opens up a whole new field of rich physics, especially at small interlayer twist. Here we report on magnetotransport measurements on twisted graphene bilayers, prepared by folding of single layers. These reveal a strong dependence on the twist angle, which can be estimated by means of sample geometry. At small rotation, superlattices with a wavelength in the order of 10 nm arise and are observed by friction atomic force microscopy. Magnetotransport measurements in this small-angle regime show the formation of satellite Landau fans. These are attributed to additional Dirac singularities in the band structure and discussed with respect to the wide range of interlayer coupling models.
The effect of facility-based antiretroviral therapy programs on outpatient services in Kenya and Uganda
Creators: name: Levine, Aubrey J
name: Haakenstad, Annie
name: Masters, Samuel H
name: Gakidou, Emmanuela
name: Njuguna, Pamela
name: Wollum, Alexandra
name: Duber, Herbert C
name: Ikilezi, Gloria
name: DeCenso, Brendan
name: Fullman, Nancy
name: Odeny, Thomas A
name: Dansereau, Emily
name: Gasasira, Anne
name: Bannon, Kelsey A
name: Conner, Ruben O
name: Roberts, D. Allen
name: Okiro, Emelda A
name: Achan, Jane
name: Kisia, Caroline
name: Burstein, Roy
name: Hanlon, Michael
Publisher: name: BioMed Central
Year: 2017

description: Abstract Background Considerable debate exists concerning the effects of antiretroviral therapy (ART) service scale-up on non-HIV services and overall health system performance in sub-Saharan Africa. In this study, we examined whether ART services affected trends in non-ART outpatient department (OPD) visits in Kenya and Uganda. Methods Using a nationally representative sample of health facilities in Kenya and Uganda, we estimated the effect of ART programs on OPD visits from 2007 to 2012. We modeled the annual percent change in non-ART OPD visits using hierarchical mixed-effects linear regressions, controlling for a range of facility characteristics. We used four different constructs of ART services to capture the different ways in which the presence, growth, overall, and relative size of ART programs may affect non-ART OPD services. Results Our final sample included 321 health facilities (140 in Kenya and 181 in Uganda). On average, OPD and ART visits increased steadily in Kenya and Uganda between 2007 and 2012. For facilities where ART services were not offered, the average annual increase in OPD visits was 4·2% in Kenya and 13·5% in Uganda. Among facilities that provided ART services, we found average annual OPD volume increases of 7·2% in Kenya and 5·6% in Uganda, with simultaneous annual increases of 13·7% and 12·5% in ART volumes. We did not find a statistically significant relationship between annual changes in OPD services and the presence, growth, overall, or relative size of ART services. However, in a subgroup analysis, we found that Ugandan hospitals that offered ART services had statistically significantly less growth in OPD visits than Ugandan hospitals that did not provide ART services. Conclusions Our findings suggest that ART services in Kenya and Uganda did not have a statistically significant deleterious effects on OPD services between 2007 and 2012, although subgroup analyses indicate variation by facility type. Our findings are encouraging, particularly given recent recommendations for universal access to ART, demonstrating that expanding ART services is not inherently linked to declines in other health services in sub-Saharan Africa.
Testing convective-core overshooting using period spacings of dipole modes in red giants
Creators: name: Montalban, J.
name: Miglio, A.
name: Noels, A.
name: Dupret, M. -A.
name: Scuflaire, R.
name: Ventura, P.
Publisher: name: arXiv
Year: 2013
Subjects: subject: Solar and Stellar Astrophysics (astro-ph.SR)
subject: FOS: Physical sciences

description: Uncertainties on central mixing in main sequence (MS) and core He-burning (He-B) phases affect key predictions of stellar evolution such as late evolutionary phases, chemical enrichment, ages etc. We propose a test of the extension of extra-mixing in two relevant evolutionary phases based on period spacing Delta_P of solar-like oscillating giants. From stellar models and their corresponding adiabatic frequencies (respectively computed with ATON and LOSC codes) we provide the first predictions of the observable Delta_P for stars in the red giant branch (RGB) and in the red clump (RC). We find: i) a clear correlation between Delta_P and the mass of the helium core (M_He); the latter in intermediate-mass stars depends on the MS overshooting, hence it can be used to set constraints on extra mixing during MS when coupled with chemical composition; ii) a linear dependence of the average value of the asymptotic period spacing (_a) during the He-B phase on the size of the convective core. A first comparison with the inferred asymptotic period spacing for Kepler RC stars suggests the need for extra mixing also during this phase, as evinced from other observational facts.
description: 19 pages, 8 figures, accepted for publication in ApJ
Dynamic polarizabilities for the low lying states of Ca+
Creators: name: Tang, Yong-Bo
name: Qiao, Hao-Xue
name: Shi, Ting-Yun
name: Mitroy, J.
Publisher: name: arXiv
Year: 2013
Subjects: subject: Atomic and Molecular Clusters (physics.atm-clus)
subject: Atomic Physics (physics.atom-ph)
subject: FOS: Physical sciences

description: The dynamic polarizabilities of the 4s, 3d and 4p states of Ca$^+$, are calculated using a relativistic structure model. The wavelengths at which the Stark shifts between different pairs of transitions are zero are computed. Experimental determination of the magic wavelengths can be used to estimate the ratio of the $f_{3d_{J}\to 4p_{J'}}$ and $f_{4s_{1/2} \to 4p_{J'}}$ oscillator strengths. This could prove valuable in developing better atomic structure models and in particular lead to improved values of the polarizabilities needed in the evaluation of the blackbody radiation shift of the Ca$^+$ ion.
description: 12 pages, 5 figures (accepted)
Alsine rupestris L.
Creators: name: Becherer
Publisher: name: Zenodo
Year: 1956
Subjects: Biodiversity
Taxonomy

description: P. rupestris L. Cat. 88. Bis etwa 2200 m: ob der unteren Täschalp im Mattertal (Huber). 2: Gebiet Lötschental-Gredetschtal ziemlich verbreitet (Zwicky).- 3:Verbreitet. - 3a:Gondo- Schlucht zwischen dem Fort und Gondo (Becherer); an der Doveria unter Gondo (idem)-4: Niederwald (Becherer und Zwicky); Münster (iidem). Var.typica Th.Wolf f. humilis (Rouy et Camus) Th. Wolf- 3:Zermatt (Wilczek). Var.subalpina Th. Wolf - Von Th. Wolf für das Wallis angegeben.
description: Published as part of Becherer, 1956, Florae Vallesiacae Supplementum, pp. 1-556 in Denkschriften der Schweizerischen Naturforschenden Gesellschaft 71 on pages 1-556
Isoprostane und 3-Nitrotyrosin als neue Indexparameter des oxidativen Stresses in vivo : Analytik, Bildung, Metabolismus und biologische Bedeutung
Creators: name: Schwedhelm, Edzard
Publisher: name: Hannover : Universität
Year: 2001
Subjects: subject: Isoprostanes
subject: 3-nitrotyrosine
subject: oxidative stress
subject: Dewey Decimal Classification::600 | Technik::610 | Medizin, Gesundheit
subject: Dewey Decimal Classification::500 | Naturwissenschaften::570 | Biowissenschaften, Biologie
subject: Dewey Decimal Classification::500 | Naturwissenschaften::540 | Chemie

description: [no abstract]
Line strengths and updated molecular constants for the C2 Swan system
Creators: name: Brooke, James S. A.
name: Bernath, Peter F.
name: Schmidt, Timothy W.
name: Bacskay, George B.
Publisher: name: arXiv
Year: 2012
Subjects: subject: Solar and Stellar Astrophysics (astro-ph.SR)
subject: Chemical Physics (physics.chem-ph)
subject: FOS: Physical sciences

description: New rotational line strengths for the C2 Swan system have been calculated for vibrational bands with v'=0-10 and v"=0-9, and J values up to J=34-96, based on previous observations in 30 vibrational bands. Line positions from several sources were combined with the results from recent deperturbation studies of the v'=4 and v'=6 states, and a weighted global least squares fit was performed. We report the updated molecular constants. The line strengths are based on a recent ab initio calculation of the transition dipole moment function. A line list has been made available, including observed and calculated line positions, Einstein A coefficients and oscillator strengths (f-values). The line list will be useful for astronomers and combustion scientists who utilize C2 Swan spectra. Einstein A coefficients and f-values were also calculated for the vibrational bands of the Swan system.
description: 23 pages, 5 figures, submitted to JQSRT, new C2 Swan line list available at http://bernath.uwaterloo.ca/download/AutoIndex.php?dir=/C2/ (C2SwanLineList2012.txt); Changes for version 2 - typo in equations 4 and 5, line list updated due to typo in code causing f-values in line list to be calculated incorrectly (all other values in list, and all values in tables are correct)
The 100th anniversary of the four-point probe technique: the role of probe geometries in isotropic and anisotropic systems
Creators: name: Miccoli, Ilio
name: Edler, Frederik
name: Pfnür, Herbert
name: Tegenkamp, Christoph
Publisher: name: Bristol : IOP Publishing Ltd.
Year: 2015
Subjects: subject: bulk and surface resistivity
subject: four-point probe techniques
subject: correction factor
subject: nanostructures
subject: semiconductor sheet resistivity
subject: finite contacts
subject: square sample
subject: hall plate
subject: conductivity measurements
subject: electrical-resistivity
subject: 4-probe resistances
subject: van
subject: electrodes
subject: extension
subject: Dewey Decimal Classification::500 | Naturwissenschaften::530 | Physik

description: The electrical conductivity of solid-state matter is a fundamental physical property and can be precisely derived from the resistance measured via the four-point probe technique excluding contributions from parasitic contact resistances. Over time, this method has become an interdisciplinary characterization tool in materials science, semiconductor industries, geology, physics, etc, and is employed for both fundamental and application-driven research. However, the correct derivation of the conductivity is a demanding task which faces several difficulties, e.g. the homogeneity of the sample or the isotropy of the phases. In addition, these sample-specific characteristics are intimately related to technical constraints such as the probe geometry and size of the sample. In particular, the latter is of importance for nanostructures which can now be probed technically on very small length scales. On the occasion of the 100th anniversary of the four-point probe technique, introduced by Frank Wenner, in this review we revisit and discuss various correction factors which are mandatory for an accurate derivation of the resistivity from the measured resistance. Among others, sample thickness, dimensionality, anisotropy, and the relative size and geometry of the sample with respect to the contact assembly are considered. We are also able to derive the correction factors for 2D anisotropic systems on circular finite areas with variable probe spacings. All these aspects are illustrated by state-of-the-art experiments carried out using a four-tip STM/SEM system. We are aware that this review article can only cover some of the most important topics. Regarding further aspects, e.g. technical realizations, the influence of inhomogeneities or different transport regimes, etc, we refer to other review articles in this field.
Spectral engineering of integrated photonic filters using mode splitting in silicon nanowire integrated standing-wave resonators
Creators: name: Moss, David J.
Publisher: name: arXiv
Year: 2022
Subjects: subject: Optics (physics.optics)
subject: FOS: Physical sciences

description: Mode splitting induced by coherent optical mode interference in coupled resonant cavities is a key phenomenon in photonic resonators that can lead to powerful and versatile filtering functions, in close analogy to electromagnetically-induced-transparency, Autler-Townes splitting, Fano resonances, and dark states. It can not only break the dependence between quality factor, free spectral range, and physical cavity length, but can also lead to group delay response and mode interactions that are useful for enhancing light-material interaction and dispersion engineering in nonlinear optics. In this work, we investigate mode splitting in standing-wave (SW) resonators implemented by cascaded Sagnac loop reflectors (CSLRs) and demonstrate its use for engineering the spectral profile of integrated photonic filters. By changing the reflectivity of the Sagnac loop reflectors (SLRs) and the phase shifts along the connecting waveguides, we tailor mode splitting in the CSLR resonators to achieve a wide range of filter shapes for diverse applications including enhanced light trapping, flat-top filtering, Q factor enhancement, and signal reshaping. We present the theoretical designs and compare the performance of CSLR resonators with three, four, and eight SLRs fabricated in silicon-on-insulator nanowires. We achieve high performance and versatile filter shapes via diverse mode splitting that agree well with theory. The experimental results confirm the effectiveness of our approach towards realizing integrated multi-functional SW filters for flexible spectral engineering.
description: 11pages, 6 figures, 116 references. arXiv admin note: substantial text overlap with arXiv:1805.05405
Outcomes and associated risk factors of patients traced after being lost to follow-up from antiretroviral treatment in Lilongwe, Malawi
Creators: name: Kamlaka, Maggie
name: Nkwazi, Brains
name: Hochgesang, Mindy
name: Hosseinipour, Mina C
name: Boxshall, Matt
name: Tweya, Hannock
name: Chagwera, Frederick
name: Weigel, Ralf
name: Phiri, Sam
name: Mhango, Eustice
name: Brinkhof, Martin WG
Publisher: name: BioMed Central Ltd
Year: 2011

description: Abstract Background Loss to follow-up is a major challenge of antiretroviral treatment (ART) programs in sub-Saharan Africa. Our objective was to a) determine true outcomes of patients lost to follow-up (LTFU) and b) identify risk factors associated with successful tracing and deaths of patients LTFU from ART in a large public sector clinic in Lilongwe, Malawi. Methods Patients who were more than 2 weeks late according to their last ART supply and who provided a phone number or address in Lilongwe were eligible for tracing. Their outcomes were updated and risk factors for successful tracing and death were examined. Results Of 1800 patients LTFU with consent for tracing, 724 (40%) were eligible and tracing was successful in 534 (74%): 285 (53%) were found to be alive and on ART; 32 (6%) had stopped ART; and 217 (41%) had died. Having a phone contact doubled tracing success (adjusted odds ratio, aOR = 2.1, 95% CI 1.4-3.0) and odds of identifying deaths [aOR = 1.8 (1.2-2.7)] in patients successfully traced. Mortality was higher when ART was fee-based at initiation (aOR = 2.3, 95% CI 1.1-4.7) and declined with follow-up time on ART. Limiting the analysis to patients living in Lilongwe did not change the main findings. Conclusion Ascertainment of contact information is a prerequisite for tracing, which can reveal outcomes of a large proportion of patients LTFU. Having a phone contact number is critical for successful tracing, but further research should focus on understanding whether phone tracing is associated with any differential reporting of mortality or LTFU.
title: „Ritual“ als epistemologisches Problem der (prähistorischen) Archäologie. Religionswissenschaftliche und erkenntnistheoretische Anmerkungen zum Problem urzeitlicher Religionen
Creators: name: Rubel, Alexander
Publisher: name: University Library Heidelberg
Year: 2016

description: Keywords: religion, Prehistory, ritual

Includes a summary in Romanian.
Variabilität des Schweregrads bei familiärer hypertropher Kardiomyopathie : Quantifizierung von Wildtyp und Mutante auf mRNA- und Proteinebene
Creators: name: Schulte, Imke
Publisher: name: Hannover : Universität
Year: 2001
Subjects: subject: Beta-Myosin heavy chain
subject: familial hypertrophic cardiomyopathy
subject: quantification
subject: Dewey Decimal Classification::600 | Technik::610 | Medizin, Gesundheit
subject: Dewey Decimal Classification::500 | Naturwissenschaften::570 | Biowissenschaften, Biologie
subject: Dewey Decimal Classification::500 | Naturwissenschaften::540 | Chemie

description: [no abstract]
A Real-Time Wrong-Way Vehicle Detection Based on YOLO and Centroid Tracking
Creators: name: Rahman, Zillur
name: Ami, Amit Mazumder
name: Ullah, Muhammad Ahsan
Publisher: name: arXiv
Year: 2022
Subjects: subject: Computer Vision and Pattern Recognition (cs.CV)
subject: FOS: Computer and information sciences

description: Wrong-way driving is one of the main causes of road accidents and traffic jam all over the world. By detecting wrong-way vehicles, the number of accidents can be minimized and traffic jam can be reduced. With the increasing popularity of real-time traffic management systems and due to the availability of cheaper cameras, the surveillance video has become a big source of data. In this paper, we propose an automatic wrong-way vehicle detection system from on-road surveillance camera footage. Our system works in three stages: the detection of vehicles from the video frame by using the You Only Look Once (YOLO) algorithm, track each vehicle in a specified region of interest using centroid tracking algorithm and detect the wrong-way driving vehicles. YOLO is very accurate in object detection and the centroid tracking algorithm can track any moving object efficiently. Experiment with some traffic videos shows that our proposed system can detect and identify any wrong-way vehicle in different light and weather conditions. The system is very simple and easy to implement.
description: 5 pages
Untersuchungen zur Struktur und Interaktion funktioneller Domänen ionotroper Glutamatrezeptoren
Creators: name: Strutz, Nathalie
Publisher: name: Hannover : Universität
Year: 2001
Subjects: subject: Glutamate receptors
subject: kainate binding proteins
subject: kainate receptor
subject: Dewey Decimal Classification::500 | Naturwissenschaften::570 | Biowissenschaften, Biologie
subject: Dewey Decimal Classification::500 | Naturwissenschaften::540 | Chemie
subject: Dewey Decimal Classification::600 | Technik::610 | Medizin, Gesundheit

description: [no abstract]
Mock theta functions and weakly holomorphic modular forms modulo 2 and 3
Creators: name: Ahlgren, Scott
name: Kim, Byungchan
Publisher: name: arXiv
Year: 2013
Subjects: subject: Number Theory (math.NT)
subject: FOS: Mathematics
subject: 11F33, 11F37

description: We prove that the coefficients of certain mock theta functions possess no linear congruences modulo 3. We prove similar results for the moduli 2 and 3 for a wide class of weakly holomorphic modular forms and discuss applications. This extends work of Radu on the behavior of the ordinary partition function modulo 2 and 3.
description: 19 pages
Entwicklung neuartiger Screening-Verfahren zur Mutationsdetektion in embryonalen Stammzellen der Maus
Creators: name: Rosenkranz, Ruben Josef
Publisher: name: Hannover : Gottfried Wilhelm Leibniz Universität Hannover
Year: 2010
Subjects: subject: Embryonic stem cells
subject: ENU mutagensesis
subject: screening process
subject: Embryonale Stammzellen
subject: ENU-Mutagenese
subject: Durchmusterungsverfahren
subject: Dewey Decimal Classification::500 | Naturwissenschaften::570 | Biowissenschaften, Biologie

description: [no abstract]
Vorausschauende selbstadaptierende Heizungsregelung für Solarhäuser
Creators: name: Thron, Ute
Publisher: name: Hannover : Universität
Year: 2001
Subjects: subject: Heating control
subject: predictive
subject: adaptive
subject: Dewey Decimal Classification::600 | Technik::620 | Ingenieurwissenschaften und Maschinenbau::621 | Angewandte Physik::621,3 | Elektrotechnik, Elektronik

description: [no abstract]
Plasmoid Ejections and Loop Contractions in an Eruptive M7.7 Solar Flare: Evidence of Particle Acceleration and Heating in Magnetic Reconnection Outflows
Creators: name: Liu, Wei
name: Chen, Qingrong
name: Petrosian, Vahe'
Publisher: name: arXiv
Year: 2013
Subjects: subject: Solar and Stellar Astrophysics (astro-ph.SR)
subject: High Energy Astrophysical Phenomena (astro-ph.HE)
subject: Plasma Physics (physics.plasm-ph)
subject: Space Physics (physics.space-ph)
subject: FOS: Physical sciences

description: Where particle acceleration and plasma heating take place in relation to magnetic reconnection is a fundamental question for solar flares. We report analysis of an M7.7 flare on 2012 July 19 observed by SDO/AIA and RHESSI. Bi-directional outflows in forms of plasmoid ejections and contracting cusp-shaped loops originate between an erupting flux rope and underlying flare loops at speeds of typically 200-300 km/s up to 1050 km/s. These outflows are associated with spatially separated double coronal X-ray sources with centroid separation decreasing with energy. The highest temperature is located near the nonthermal X-ray loop-top source well below the original heights of contracting cusps near the inferred reconnection site. These observations suggest that the primary loci of particle acceleration and plasma heating are in the reconnection outflow regions, rather than the reconnection site itself. In addition, there is an initial ascent of the X-ray and EUV loop-top source prior to its recently recognized descent, which we ascribe to the interplay among multiple processes including the upward development of reconnection and the downward contractions of reconnected loops. The impulsive phase onset is delayed by 10 minutes from the start of the descent, but coincides with the rapid speed increases of the upward plasmoids, the individual loop shrinkages, and the overall loop-top descent, suggestive of an intimate relation of the energy release rate and reconnection outflow speed.
description: Accepted by ApJ, March 04, 2013; 18 pages, 14 figures, online movies at http://lmsal.com/~weiliu/my_papers/2012-08_flare-cusp-SADs/movies.zip
Search for Alfvén waves in a bright network element observed in Halpha
Creators: name: Koza, J.
name: Sütterlin, P.
name: Gömöry, P.
name: Rybák, J.
name: Kucera, A.
Publisher: name: arXiv
Year: 2013
Subjects: subject: Solar and Stellar Astrophysics (astro-ph.SR)
subject: FOS: Physical sciences

description: Alfven waves are considered as potential transporters of energy heating the solar corona. We seek spectroscopic signatures of the Alfven waves in the chromosphere occupied by a bright network element, investigating temporal variations of the spectral width, intensity, Dopplershift, and the asymmetry of the core of the Halpha spectral line observed by the tunable Lyot filter installed on the Dutch Open Telescope. The spectral characteristics are derived through the fitting of five intensity samples, separated from each other by 0.35 A, by a 4th-order polynomial. The bright network element displays the most pronounced variations of the Dopplershift varying from 0 to 4 km/s about the average of 1.5 km/s. This fact implies a persistent redshift of the Halpha core with a redward asymmetry of about 0.5 km/s, suggesting an inverse-C bisector. The variations of the core intensity up to +-10% and the core width up to +-5% about the respective averages are much less pronounced, but still detectable. The core intensity variations lag behind the Dopplershift variations about 2.1 min. The Halpha core width tends to correlate with the Dopplershift and anticorrelate with the asymmetry, suggesting that more redshifted Halpha profiles are wider and the broadening of the Halpha core is accompanied with a change of the core asymmetry from redward to blueward. We also found a striking anticorrelation between the core asymmetry and the Dopplershift, suggesting a change of the core asymmetry from redward to blueward with an increasing redshift of the Halpha core. The data and the applied analysis do not show meaningful tracks of Alfven waves in the selected network element.
description: 22 pages, 12 figures, in press in Contributions of Astronomical Observatory Skalnat\'e Pleso, Vol. 43, p. 5 - 26, (2013)
Anthropometric indices for non-pregnant women of childbearing age differ widely among four low-middle income populations
Creators: name: Garcés, Ana
name: Tshefu, Antoinette
name: Pasha, Omrana
name: McClure, Elizabeth M
name: Dhaded, Sangappa
name: Figueroa, Lester
name: Westcott, Jamie E
name: Derman, Richard J
name: Lander, Rebecca L
name: Bose, Carl
name: Bauserman, Melissa
name: Goldenberg, Robert L
name: Aziz Ali, Sumera
name: Krebs, Nancy F
name: Goudar, Shivaprasad S
name: Lokangaka, Adrien
name: Stolka, Kristen
name: Das, Abhik
name: Hambidge, K Michael
name: Thorsten, Vanessa R
Publisher: name: BioMed Central
Year: 2017

description: Abstract Background Maternal stature and body mass indices (BMI) of non-pregnant women (NPW) of child bearing age are relevant to maternal and offspring health. The objective was to compare anthropometric indices of NPW in four rural communities in low- to low-middle income countries (LMIC). Methods Anthropometry and maternal characteristics/household wealth questionnaires were obtained for NPW enrolled in the Women First Preconception Maternal Nutrition Trial. Body mass index (BMI, kg/m2) was calculated. Z-scores were determined using WHO reference data. Results A total of 7268 NPW participated in Equateur, DRC (n = 1741); Chimaltenango, Guatemala (n = 1695); North Karnataka, India (n = 1823); and Thatta, Sindh, Pakistan (n = 2009). Mean age was 23 y and mean parity 1.5. Median (P25-P75) height (cm) ranged from 145.5 (142.2–148.9) in Guatemala to 156.0 (152.0–160.0) in DRC. Median weight (kg) ranged from 44.7 (39.9–50.3) in India to 52.7 (46.9–59.8) in Guatemala. Median BMI ranged from 19.4 (17.6–21.9) in India to 24.9 (22.3–28.0) in Guatemala. Percent stunted (<−2SD height for age z-score) ranged from 13.9% in DRC to 80.5% in Guatemala; % underweight (BMI <18.5) ranged from 1.2% in Guatemala to 37.1% in India; % overweight/obese (OW, BMI ≥25.0) ranged from 5.7% in DRC to 49.3% in Guatemala. For all sites, indicators for higher SES and higher age were associated with BMI. Lower SES women were underweight more frequently and higher SES women were OW more frequently at all sites. Younger women tended to be underweight, while older women tended to be OW. Conclusions Anthropometric data for NPW varied widely among low-income rural populations in four countries located on three different continents. Global comparisons of anthropometric measurements across sites using standard reference data serve to highlight major differences among populations of low-income rural NPW and assist in evaluating the rationale for and the design of optimal intervention trials. Trial registration ClinicalTrials.gov # NCT01883193 (18 June 2013, retrospectively registered)
Eindeutigkeitssätze für langsam wachsende Funktionen im Einheitskreis
Creators: name: Titzhoff, Frank
Publisher: name: Hannover : Universität
Year: 2001
Subjects: subject: Nevanlinna theory
subject: uniqueness of meromorphic functions
subject: slowly growing functions at the unit disk
subject: Dewey Decimal Classification::500 | Naturwissenschaften::510 | Mathematik

description: [no abstract]
Superlattice structures in twisted bilayers of folded graphene
Creators: name: Schmidt, Hennrik
name: Rode, Johannes C.
name: Smirnov, Dmitri
name: Haug, Rolf J.
Publisher: name: London : Macmillan Publishers Limited
Year: 2014
Subjects: subject: Physical sciences
subject: FOS: Physical sciences
subject: Condensed matter
subject: Materials science
subject: Dewey Decimal Classification::500 | Naturwissenschaften::530 | Physik

description: The electronic properties of bilayer graphene strongly depend on relative orientation of the two atomic lattices. Whereas Bernal-stacked graphene is most commonly studied, a rotational mismatch between layers opens up a whole new field of rich physics, especially at small interlayer twist. Here we report on magnetotransport measurements on twisted graphene bilayers, prepared by folding of single layers. These reveal a strong dependence on the twist angle, which can be estimated by means of sample geometry. At small rotation, superlattices with a wavelength in the order of 10 nm arise and are observed by friction atomic force microscopy. Magnetotransport measurements in this small-angle regime show the formation of satellite Landau fans. These are attributed to additional Dirac singularities in the band structure and discussed with respect to the wide range of interlayer coupling models.
Sigma models for genuinely non-geometric backgrounds
Creators: name: Chatzistavrakidis, Athanasios
name: Jonke, Larisa
name: Lechtenfeld, Olaf
Publisher: name: New York : Springer
Year: 2015
Subjects: subject: Sigma Models
subject: Differential and Algebraic Geometry
subject: String Duality
subject: Flux compactifications
subject: Dewey Decimal Classification::500 | Naturwissenschaften::530 | Physik

description: The existence of genuinely non-geometric backgrounds, i.e. ones without geometric dual, is an important question in string theory. In this paper we examine this question from a sigma model perspective. First we construct a particular class of Courant algebroids as protobialgebroids with all types of geometric and non-geometric fluxes. For such structures we apply the mathematical result that any Courant algebroid gives rise to a 3D topological sigma model of the AKSZ type and we discuss the corresponding 2D field theories. It is found that these models are always geometric, even when both 2-form and 2-vector fields are neither vanishing nor inverse of one another. Taking a further step, we suggest an extended class of 3D sigma models, whose world volume is embedded in phase space, which allow for genuinely non-geometric backgrounds. Adopting the doubled formalism such models can be related to double field theory, albeit from a world sheet perspective.
Characterization of the contribution of shared environmental and genetic factors to metabolic syndrome methylation heritability and familial correlations
Creators: name: Young, Kristin L
name: Fernández-Rhodes, Lindsay
name: Tao, Ran
name: Aiello, Allison E
name: Graff, Mariaelisa
name: North, Kari E
name: Justice, Anne E
name: Howard, Annie G
Publisher: name: BioMed Central
Year: 2018

description: Abstract
                Background
                Transgenerational epigenetic inheritance has been posited as a possible contributor to the observed heritability of metabolic syndrome (MetS). Yet the extent to which estimates of epigenetic inheritance for DNA methylation sites are inflated by environmental and genetic covariance within families is still unclear. We applied current methods to quantify the environmental and genetic contributors to the observed heritability and familial correlations of four previously associated MetS methylation sites at three genes (CPT1A, SOCS3 and ABCG1) using real data made available through the GAW20.
                Results
                Our findings support the role of both shared environment and genetic variation in explaining the heritability of MetS and the four MetS cytosine-phosphate-guanine (CpG) sites, although the resulting heritability estimates were indistinguishable from one another. Familial correlations by type of relative pair generally followed our expectation based on relatedness, but in the case of sister and parent pairs we observed nonsignificant trends toward greater correlation than expected, as would be consistent with the role of shared environmental factors in the inflation of our estimated correlations.
                Conclusions
                Our work provides an interesting and flexible statistical framework for testing models of epigenetic inheritance in the context of human family studies. Future work should endeavor to replicate our findings and advance these methods to more robustly describe epigenetic inheritance patterns in human populations.
GSV-Cities: Toward Appropriate Supervised Visual Place Recognition
Creators: name: Ali-bey, Amar
name: Chaib-draa, Brahim
name: Giguère, Philippe
Publisher: name: arXiv
Year: 2022
Subjects: subject: Computer Vision and Pattern Recognition (cs.CV)
subject: FOS: Computer and information sciences

description: This paper aims to investigate representation learning for large scale visual place recognition, which consists of determining the location depicted in a query image by referring to a database of reference images. This is a challenging task due to the large-scale environmental changes that can occur over time (i.e., weather, illumination, season, traffic, occlusion). Progress is currently challenged by the lack of large databases with accurate ground truth. To address this challenge, we introduce GSV-Cities, a new image dataset providing the widest geographic coverage to date with highly accurate ground truth, covering more than 40 cities across all continents over a 14-year period. We subsequently explore the full potential of recent advances in deep metric learning to train networks specifically for place recognition, and evaluate how different loss functions influence performance. In addition, we show that performance of existing methods substantially improves when trained on GSV-Cities. Finally, we introduce a new fully convolutional aggregation layer that outperforms existing techniques, including GeM, NetVLAD and CosPlace, and establish a new state-of-the-art on large-scale benchmarks, such as Pittsburgh, Mapillary-SLS, SPED and Nordland. The dataset and code are available for research purposes at https://github.com/amaralibey/gsv-cities.
description: Neurocomputing 2022
Masses and Distance of the Young Binary NTTS 045251+3016
Creators: name: Simon, M.
name: Schaefer, G. H.
name: Prato, L.
name: Ruiz-Rodriguez, Dary
name: Karnath, N.
name: Franz, O. G.
name: Wasserman, L. H.
Publisher: name: arXiv
Year: 2013
Subjects: subject: Solar and Stellar Astrophysics (astro-ph.SR)
subject: FOS: Physical sciences

description: As part of our continuing campaign to measure the masses of pre-main sequence stars dynamically and thus to assess the reliability of the discrepant theoretical calculations of contraction to the main sequence, we present new results for NTTS 045251+3016, a visual and double-lined spectroscopic binary in the Taurus Star Forming Region. We obtained new high angular resolution astrometry and high spectral resolution spectroscopy at Keck Observatory. The new data lead to a significant revision of previously published orbital parameters. In particular, we find that the masses of the primary and secondary are 0.86+/-0.11 and 0.55+/-0.05 M_sun, respectively, smaller than previously reported, and that the system lies 158.7+/-3.9 pc from the sun, further than previously reported.
description: 36pp; accepted for publication in the ApJ
Status of GEO 600
Creators: name: Dooley, K.L.
name: Et Al.
name: LIGO Scientific Collaboration
Publisher: name: Bristol : IOP Publishing Ltd
Year: 2015
Subjects: subject: GEO-HF
subject: laser
subject: OMC
subject: Classical and Quantum Gravity
subject: Konferenzschrift
subject: Dewey Decimal Classification::500 | Naturwissenschaften::530 | Physik

description: The German-British laser-interferometric gravitational wave detector GEO 600 is in its 13th year of operation since its first lock in 2001. After participating in science runs with other first generation detectors, GEO 600 has continued collecting data as an astrowatch instrument with a duty cycle of 62% during the time when the other detectors have gone offline to undergo substantial upgrades. Less invasive upgrades to demonstrate advanced technologies and improve the GEO 600 sensitivity at high frequencies as part of the GEO-HF program have additionally been carried out in parallel to data taking. We report briefly on the status of GEO 600.
The basic physics of the binary black hole merger GW150914
Creators: name: LIGO Scientific Collaboration
name: Collaboration, Virgo
name: Allen, Bruce
name: Aufmuth, Peter
name: Bisht, A.
name: Danzmann, Karsten
name: Heurs, M.
name: Kaufer, S.
name: Krueger, C.
name: Loriette, V.
name: Lough, J.D.
name: Lück, Harald
name: Sawadsky, A.
name: Schütte, D.
name: Singh, A.
name: Steinmeyer, D.
name: Vahlbruch, H.
name: Willke, Benno
name: Wimmer, M.H.
name: Wittel, H.
Publisher: name: Weinheim : Wiley-VCH Verlag
Year: 2017
Subjects: subject: Dewey Decimal Classification::500 | Naturwissenschaften::530 | Physik

description: The first direct gravitational-wave detection was made by the Advanced Laser Interferometer Gravitational Wave Observatory on September 14, 2015. The GW150914 signal was strong enough to be apparent, without using any waveform model, in the filtered detector strain data. Here, features of the signal visible in the data are analyzed using concepts from Newtonian physics and general relativity, accessible to anyone with a general physics background. The simple analysis presented here is consistent with the fully general-relativistic analyses published elsewhere, in showing that the signal was produced by the inspiral and subsequent merger of two black holes. The black holes were each of approximately , still orbited each other as close as ∼350 km apart and subsequently merged to form a single black hole. Similar reasoning, directly from the data, is used to roughly estimate how far these black holes were from the Earth, and the energy that they radiated in gravitational waves.
Solar filament eruptions and their physical role in triggering Coronal Mass Ejections
Creators: name: Schmieder, B.
name: Demoulin, P.
name: Aulanier, G.
Publisher: name: arXiv
Year: 2012
Subjects: subject: Solar and Stellar Astrophysics (astro-ph.SR)
subject: FOS: Physical sciences

description: Solar filament eruptions play a crucial role in triggering coronal mass ejections (CMEs). More than 80 % of eruptions lead to a CME. This correlation has been studied extensively during the past solar cycles and the last long solar minimum. The statistics made on events occurring during the rising phase of the new solar cycle 24 is in agreement with this finding. Both filaments and CMEs have been related to twisted magnetic fields. Therefore, nearly all the MHD CME models include a twisted flux tube, called a flux rope. Either the flux rope is present long before the eruption, or it is built up by reconnection of a sheared arcade from the beginning of the eruption. In order to initiate eruptions, different mechanisms have been proposed: new emergence of flux, and/or dispersion of the external magnetic field, and/or reconnection of field lines below or above the flux rope. These mechanisms reduce the downward magnetic tension and favor the rise of the flux rope. Another mechanism is the kink instability when the configuration is twisted too much. In this paper we open a forum of discussions revisiting observational and theoretical papers to understand which mechanisms trigger the eruption. We conclude that all the above quoted mechanisms could bring the flux rope to an unstable state. However, the most efficient mechanism for CMEs is the loss-of-equilibrium or torus instability, when the flux rope has reached an unstable threshold determined by a decay index of the external magnetic field.
description: 23 pages, 13 figures, review
Potentilla multifida L.
Creators: name: Becherer
Publisher: name: Zenodo
Year: 1956
Subjects: Biodiversity
Taxonomy

description: P. multifida L. Cat. 89. 3:Bei Chanrion im Val de Bagnes wieder aufgefunden 1902von Pannatier am Glacier de Breney; neu festgestellt im Val des Dix und im Val d'Herens: ob den unteren Hütten von Seilon(Val des Dix), gegen 2350 m (Pannatier, vermutlich 1901; vgl. Pannatier Lit. 1902, S. 134); Alp Götter östlich Evolene (leg.?; nach Pannatier Lit. 1903, S. 194); zwischen Arolla und dem Pas de Chevres, gegen 2200 m (Pannatier 1902; vgl. Pannatier Lit. 1903, S. 194); Alpen von Zermatt: auch neuerdings vielfach nachgewiesen, ausser an den im Cat. verzeichneten Stellen z. B.: Hotel Riffelberg (Huber, Becherer), Stellisee (Thellung), Theodulweg (Thellung, Becherer), Platthörner (Braun- Blanquet), höchste Stelle: Gornergrat, 3105 m (Braun-Blanquet 1919); Saastal: die (einzige) Angäbe aus diesem Tal: Mattwaldalp (F. 0. Wolf) ist verdächtig; die Art wurde dort in neuerer Zeit vergeblich gesucht. Angeblich ferner: 3a: Alpienrung ob Gondo (F. 0. Wolf 1904 in herb. de Palezieux). Die bis 40 cm hohen Exemplare machen den Eindruck von kultivierten Pflanzen, so dass man den Verdacht nicht los wird, sie könnten aus einem Alpengarten (Zermatt?) stammen.
description: Published as part of Becherer, 1956, Florae Vallesiacae Supplementum, pp. 1-556 in Denkschriften der Schweizerischen Naturforschenden Gesellschaft 71 on pages 1-556
HD 140283: A Star in the Solar Neighborhood that Formed Shortly After the Big Bang
Creators: name: Bond, Howard E.
name: Nelan, Edmund P.
name: VandenBerg, Don A.
name: Schaefer, Gail H.
name: Harmer, Dianne
Publisher: name: arXiv
Year: 2013
Subjects: subject: Solar and Stellar Astrophysics (astro-ph.SR)
subject: FOS: Physical sciences

description: HD 140283 is an extremely metal-deficient and high-velocity subgiant in the solar neighborhood, having a location in the HR diagram where absolute magnitude is most sensitive to stellar age. Because it is bright, nearby, unreddened, and has a well-determined chemical composition, this star avoids most of the issues involved in age determinations for globular clusters. Using the Fine Guidance Sensors on the Hubble Space Telescope, we have measured a trigonometric parallax of 17.15 +/- 0.14 mas for HD 140283, with an error one-fifth of that determined by the Hipparcos mission. Employing modern theoretical isochrones, which include effects of helium diffusion, revised nuclear reaction rates, and enhanced oxygen abundance, we use the precise distance to infer an age of 14.46 +/- 0.31 Gyr. The quoted error includes only the uncertainty in the parallax, and is for adopted surface oxygen and iron abundances of [O/H] = -1.67 and [Fe/H] = -2.40. Uncertainties in the stellar parameters and chemical composition, especially the oxygen content, now contribute more to the error budget for the age of HD 140283 than does its distance, increasing the total uncertainty to about +/-0.8 Gyr. Within the errors, the age of HD 140283 does not conflict with the age of the Universe, 13.77 +/- 0.06 Gyr, based on the microwave background and Hubble constant, but it must have formed soon after the big bang.
description: 19 pages, 1 figure. Accepted by ApJ Letters
Galois groups of certain even octic polynomials
Creators: name: Chen, Malcolm Hoong Wai
name: Chin, Angelina Yan Mui
name: Tan, Ta Sheng
Publisher: name: arXiv
Year: 2022
Subjects: subject: Number Theory (math.NT)
subject: FOS: Mathematics
subject: 12F10, 11R09, 12D05, 12-08

description: Let $f(x)=x^8+ax^4+b \in \mathbb{Q}[x]$ be an irreducible polynomial where $b$ is a square. We give a method that completely describes the factorization patterns of a linear resolvent of $f(x)$ using simple arithmetic conditions on $a$ and $b$. As a result, we determine the exact six possible Galois groups of $f(x)$ and completely classify all of them. As an application, we characterize the Galois groups of irreducible polynomials $x^8+ax^4+1 \in \mathbb{Q}[x]$. We also use similar methods to obtain analogous results for the Galois groups of irreducible polynomials $x^8+ax^6+bx^4+ax^2+1 \in \mathbb{Q}[x]$.
description: 22 pages, preprint of article accepted to Journal of Algebra and Its Applications