cometadata/datacite-rtg-text-other-reclassification-records huggingface dataset:
Radio detection in the multi-messenger context
Creators: name: Kostunin, D.
Publisher: name: arXiv
Year: 2019
Subjects: subject: Instrumentation and Methods for Astrophysics (astro-ph.IM)
subject: High Energy Astrophysical Phenomena (astro-ph.HE)
subject: FOS: Physical sciences

description: The present work discusses the development of the radio technique for detection of ultra-high energy air-showers induced by cosmic radiation, and the prospects of its application in the future multi-messenger activities, particularly for detection of ultra-high energy cosmic rays, gamma rays and neutrinos. It gives an overview of the results achieved by the modern digital radio arrays, as well as discuss present challenges and future prospects.}
description: proceedings of the VLVNT2018 conference
title: Haunted/Haunting Digital Archives of the Fukushima Nuclear Disaster: Weaving Ghost Stories around the Ongoing Disaster in the Past, Present and Future
Creators: name: Iida, Mayu
Publisher: name: Goldsmiths, University of London
Year: 2020

description: This thesis examines the digital archives of the Fukushima nuclear disaster that took place on 11 March, 2011. I propose key thesis questions regarding the roles of the digital archive in articulating the memory and knowledge about the disaster, in relation to its capacity of storytelling. I specifically focus on the production of “ghost stories,” the stories concerning exclusions and invisibilities produced in the digital archive as a flexible, transformative vehicle of ephemeral data. This research draws on interdisciplinary discussions in the fields of media studies, sociology and archival studies, as well as the contributions of feminism and queer theory to delineating the struggles to engage with lost histories and submerged narratives. My contribution is both theoretical and methodological, in developing hauntology as a way of intervening to temporal and narrative modalities of the practices of digital archiving. In formulating hauntological methods, I attend to the creation of “haunted data” and the contingent dis/appearance of digital traces, which have allowed me to employ archival imaginaries to take into account gaps, absences and erasures as a constitutive part of archival storytelling. I also aim to demonstrate a multivalence of haunting at work in the mutual construction of the archive and the archived, with the Fukushima disaster as both haunted and haunting object of inquiry. The digital archives I analyse in the empirical chapters are: two archival repositories on the website of the Tokyo Electric Power Company (TEPCO) that owns the damaged plant; the Japan Disasters Digital Archive (JDA); SimplyInfo.org and Nukewatch.org; Teach311.org. They are “moving” repositories that keep archival objects in motion, and I ask how they articulate and bring together the fragments of the disaster, by intervening to, and generating the intricate web of connections between the past, present and future. Throughout the thesis, I argue that the constant and contingent retelling of the Fukushima disaster in the practices of digital archiving calls attention to narrative possibilities afforded by digital technologies. This research explores how the production of the digital archive entails the conflation of fact and fiction, of multiple temporalities that register different facets of haunting, and myriad regimes of remembering and forgetting, which would shape our understandings of the ongoing disaster with no definitive beginnings and ends.
title: Development of a novel electromagnetic double action meso-scale pump
Creators: name: Al-Halhouli, Ala'aldeen T.
name: Rawashdeh, Nathir A.
name: Sanna, Mousaa
name: Buttgenbach, Stephanus
name: Dietzel, Andreas
Publisher: name: IEEE
Year: 2015
Subjects: subject: electromagnetic, meso, pump, fluidics
subject: 621

description: This paper presents the design and performance evaluation of a meso-scale electromechanical fluid pump. A prototype was designed and fabricated using Polycarbonate for the housings and controlled by sequential pulsing of channel piston and valve coils. The pumping concept is based on reciprocating a hard magnet acting as a piston in a circular channel, and synchronizing this movement with two electromagnetically actuated valves located at the pump inlet and outlet ports. The pumping system is programmed to allow simultaneous energization of a set of coils that control the magnet positions. Each pump port has an inlet and outlet channel. According to the piston movement direction, i. e. clockwise or counter clockwise, the valve will change its position to allow for inflow or outflow. The pump concept was tested on a meso-scale setup for pumping water. Tests showed that a magnet rotational speed of 70 strokes per minute is achievable. A flow rate of 6.1 ml/min and a pressure of 400 Pa were obtained at this speed.
description: Publications Institute of Microtechnology IMT
Syntheses and First-Principles Calculations of the Pseudobrookite Compound AlTi2O5
Creators: name: Tohyama, Takami
name: Ogura, Riku
name: Yoshinaga, Kensuke
name: Naito, Shin
name: Miyakawa, Nobuaki
name: Kaneshita, Eiji
Publisher: name: arXiv
Year: 2018
Subjects: subject: Strongly Correlated Electrons (cond-mat.str-el)
subject: Materials Science (cond-mat.mtrl-sci)
subject: FOS: Physical sciences

description: We synthesize a new titanium-oxide compound AlTi2O5 with pseudobrookite-type structure. The formal valence of Ti is 3.5+ that is the same as the Magneli compound Ti4O7 and the spinel compound LiTi2O4. AlTi2O5 exhibits insulating behavior in resistivity. Using experimentally determined crystal structure, we perform the first-principles calculations for the electronic structures. Experimentally suggested random distribution of Al and Ti is not the origin of the insulating behavior. The Fermi surfaces for nonrandom AlTi2O5 show cylindrical shapes reflecting a layered structure, which indicates a possible nesting-driven order. Constructing a tight-binding model from the first-principles calculations, we calculate the spin and charge susceptibilities using the random phase approximation. We suggest possible charge-density-wave state forming Ti3+ chains separated from each other by Ti4+ chains, similar to the low-temperature phase of Ti4O7.
description: 8 pages, 9 figures
title: Microfluidic synthesis of metal oxide nanoparticles via the nonaqueous method
Creators: name: Stolzenburg, Pierre
name: Lorenz, Thomas
name: Dietzel, Andreas
name: Garnweitner, Georg
Publisher: name: Elsevier BV
Year: 2018
Subjects: subject: Microfluidic synthesis, droplet reactors, multiphase processing, flow focusing, nonaqueous synthesis, metal oxide nanoparticles
subject: 621

description: Microfluidic synthesis allows for a good control of the particle formation conditions while minimizing
the consumption of material. In this study, we exploited these advantages for the nonaqueous synthesis
of TiO2, ZnO and CeO2 nanoparticles in a closed micro droplet reactor which resulted in well-defined
particle structures. Monodisperse droplets are generated in microfluidic flow-focusing area and subsequently transported into a reaction zone allowing synthesis temperatures of up to 200 °C. In
addition, we showed that a continuous particle generation process using solid precursor species can be
realized without channel clogging. We present different microfluidic designs with reaction zones
consisting either of a long meandering channel or a short expansion channel to realize the different
reaction times required for the respective model systems. Interestingly, we found that at elevated
temperatures, the reaction mixture diffuses into the surrounding continuous phase fluid which leads to
a shrinkage of the droplets, forcing eventually the assembly of highly spherical aggregate structures.
Depending on the different model systems, we obtained nanospheres of about 100 nm from the CeO2
synthesis and microspheres up to 17 μm in size from the TiO2 synthesis. In contrast, ZnO syntheses at
milder temperatures were conducted without any droplet shrinkage which resulted in randomly shaped
aggregates of 150 nm that self-assembled in the droplet micro reactor. Thus, a versatile synthesis
technique is presented that can be applied for various metal oxides over a broad range of reaction
parameters, as a promising approach for the controlled production of high quality nanoparticles.
description: Publications Institute of Microtechnology IMT
Chandra centres for COSMOS X-ray galaxy groups: Differences in stellar properties between central dominant and offset brightest group galaxies
Creators: name: Gozaliasl, Ghassem
name: Finoguenov, Alexis
name: Tanaka, Masayuki
name: Dolag, Klaus
name: Montanari, Francesco
name: Kirkpatrick, Charles C.
name: Vardoulaki, Eleni
name: Khosroshahi, Habib G.
name: Salvato, Mara
name: Laigle, Clotilde
name: McCracken, Henry J.
name: Ilbert, Olivier
name: Cappelluti, Nico
name: Daddi, Emanuele
name: Hasinger, Guenther
name: Capak, Peter
name: Scoville, Nick Z.
name: Toft, Sune
name: Civano, Francesca
name: Griffiths, Richard E.
name: Balogh, Michael
name: Li, Yanxia
name: Ahoranta, Jussi
name: Mei, Simona
name: Iovino, Angela
name: Henriques, Bruno M. B.
name: Erfanianfar, Ghazaleh
Publisher: name: arXiv
Year: 2018
Subjects: subject: Astrophysics of Galaxies (astro-ph.GA)
subject: FOS: Physical sciences

description: We present the results of a search for galaxy clusters and groups in the $\sim2$ square degree of the COSMOS field using all available X-ray observations from the XMM-Newton and Chandra observatories. We reach an X-ray flux limit of $3\times10^{-16}\;ergs\;cm^{-2}\;s^{-1}$ in 0.5--2 keV range, and identify 247 X-ray groups with $M_{200c}=8\times10^{12}-3\times10^{14}\;M_{\odot}$ at a redshift range of $0.08\leq z<1.53$, using the multiband photometric redshift and the master spectroscopic redshift catalogues of the COSMOS. The X-ray centres of groups are determined using high-resolution Chandra imaging. We investigate the relations between the offset of the brightest group galaxies (BGGs) from halo X-ray centre and group properties and compare with predictions from semi-analytic models and hydrodynamical simulations. We find that BGG offset decreases with both increasing halo mass and decreasing redshift with no strong dependence on the X-ray flux and SNR. We show that the BGG offset decreases as a function of increasing magnitude gap with no considerable redshift dependent trend. The stellar mass of BGGs in observations extends over a wider dynamic range compared to model predictions. At $z<0.5$, the central dominant BGGs become more massive than those with large offsets by up to 0.3dex, in agreement with model prediction. The observed and predicted lognormal scatter in the stellar mass of both low- and large-offset BGGs at fixed halo mass is $\sim0.3$dex.
description: Accepted 2018 November 16 (MNRAS)
Agroecology and La Via Campesina I. The symbolic and material construction of agroecology through the dispositive of “peasant-to-peasant” processes
Creators: name: Val, Valentín
name: Rosset, Peter
name: Lomelí, Carla Zamora
name: Giraldo, Omar Felipe
Publisher: name: figshare
Year: 2019
Subjects: subject: 160804 Rural Sociology
subject: FOS: Sociology
subject: 70108 Sustainable Agricultural Development
subject: FOS: Other agricultural sciences

description: In this essay, we look at the symbolic and material territorialization of agroecology in La Via Campesina (LVC) through peasant-to-peasant processes (PtPPs) in the broad sense. The most significant examples of the scaling up of agroecology are clearly tied to organizational processes and in our perspective, PtPPs are the motor of these changes. We contend that agroecology, subjects, and territories are articulated in these processes, making up a powerful dispositive or device for agroecological transformation and scaling up. We also introduce a discussion on the emergence of a historical-political subject, the "agroecological peasantry," within the larger territorial dispute concerning the transformation of the agri-food system and living conditions in the countryside.
A Trichotomy for Regular Trail Queries
Creators: name: Martens, Wim
name: Niewerth, Matthias
name: Popp, Tina
Publisher: name: arXiv
Year: 2019
Subjects: subject: Formal Languages and Automata Theory (cs.FL)
subject: Databases (cs.DB)
subject: Logic in Computer Science (cs.LO)
subject: FOS: Computer and information sciences

description: Regular path queries (RPQs) are an essential component of graph query languages. Such queries consider a regular expression r and a directed edge-labeled graph G and search for paths in G for which the sequence of labels is in the language of r. In order to avoid having to consider infinitely many paths, some database engines restrict such paths to be trails, that is, they only consider paths without repeated edges. In this paper we consider the evaluation problem for RPQs under trail semantics, in the case where the expression is fixed. We show that, in this setting, there exists a trichotomy. More precisely, the complexity of RPQ evaluation divides the regular languages into the finite languages, the class Ttract (for which the problem is tractable), and the rest. Interestingly, the tractable class in the trichotomy is larger than for the trichotomy for simple paths, discovered by Bagan, Bonifati, and Groz [JCSS 2020]. In addition to this trichotomy result, we also study characterizations of the tractable class, its expressivity, the recognition problem, closure properties, and show how the decision problem can be extended to the enumeration problem, which is relevant to practice.
Dynamical Component Analysis (DyCA) and its application on epileptic EEG
Creators: name: Korn, Katharina
name: Seifert, Bastian
name: Uhl, Christian
Publisher: name: arXiv
Year: 2019
Subjects: subject: Signal Processing (eess.SP)
subject: Machine Learning (cs.LG)
subject: Chaotic Dynamics (nlin.CD)
subject: FOS: Electrical engineering, electronic engineering, information engineering
subject: FOS: Computer and information sciences
subject: FOS: Physical sciences

description: Dynamical Component Analysis (DyCA) is a recently-proposed method to detect projection vectors to reduce the dimensionality of multi-variate deterministic datasets. It is based on the solution of a generalized eigenvalue problem and therefore straight forward to implement. DyCA is introduced and applied to EEG data of epileptic seizures. The obtained eigenvectors are used to project the signal and the corresponding trajectories in phase space are compared with PCA and ICA-projections. The eigenvalues of DyCA are utilized for seizure detection and the obtained results in terms of specificity, false discovery rate and miss rate are compared to other seizure detection algorithms.
description: 5 pages, 4 figures, accepted for IEEE International Conference on Acoustics, Speech and Signal Processing (ICASSP) 2019
Free Proalgebraic Groups
Creators: name: Wibmer, Michael
Publisher: name: arXiv
Year: 2019
Subjects: subject: Algebraic Geometry (math.AG)
subject: Group Theory (math.GR)
subject: FOS: Mathematics
subject: 14L15, 14L17, 34M50, 12H05

description: Replacing finite groups by linear algebraic groups, we study an algebraic-geometric counterpart of the theory of free profinite groups. In particular, we introduce free proalgebraic groups and characterize them in terms of embedding problems. The main motivation for this endeavor is a differential analog of a conjecture of Shafarevic.
description: 36 pages, final accepted version
Genaro Rafael González Baltrón, "El Cojo".Hacer, conocer y ser. Agroecología en primera persona
Creators: name: Val, Valentín
Publisher: name: figshare
Year: 2019
Subjects: subject: Anthropology
subject: FOS: Sociology
subject: 160104 Social and Cultural Anthropology
subject: 160804 Rural Sociology

description: La historia del Cojo es un testimonio importante para la memoria de la agroecología en Cuba, Nuestra América y el mundo. La vida del Cojo y su familia refleja en gran medida la historia del campesinado cubano. Una trayectoria rica y extraordinaria que expresa elementos de la historia de muchas/os campesinos/as cubanas/os; historia(s) cruzada(s) por el proceso revolucionario y la reconfiguración de la sociedad cubana. Retrata los cambios en el medio rural a raíz de la Revolución; el acceso a salud, educación y vivienda, pero también el proceso de “obrerización”, tecnificación y mecanización de las cooperativas de la mano de la revolución verde, guiadas por las ideas de desarrollo, progreso y modernidad. Es también una historia que refleja en primera persona cómo impactaron las medidas adoptadas ante la crisis del periodo especial, cómo se desplegaron las estrategias alternativas al modelo convencional, cómo se fue reconfigurando el espacio rural, cómo se estimuló un proceso de (re)campesinización, cómo fue paulatinamente recuperándose la producción agroalimentaria, y consolidando el modelo campesino agroecológico de producción y de vida. Es la historia de un campesino y a la vez la de miles. En esta historia se condensan y entretejen muchos de los elementos que caracterizan al Movimiento Agroecológico Campesino a Campesino (MACAC) impulsado por la Asociación Nacional de Agricultores Pequeños (ANAP) como movimiento social rural, y la agroecología como alternativa al paradigma del desarrollo de la modernidad hegemónica. Es la historia de un promotor, y a su vez el retrato de cómo se ha ido construyendo y articulando el MACAC hasta su configuración actual. En la historia de vida del Cojo se manifiestan tanto la historia del movimiento agroecológico, como la alternativa de vida que representa. Más allá de sus particularidades, esta es una historia que refleja una forma de ver, sentir y hacer agroecología. Da pistas sobre los aportes campesinos a la agroecología como propuesta integral de vida desde sus prácticas, reflexiones e innovaciones. Aportes concretos y simbólicos para una agroecología desde el surco. Acercarnos brevemente a ella puede darnos pistas sobre cómo se ha ido configurando el MACAC desde una perspectiva privilegiada. Cuba, la ANAP y El Cojo han sido protagonistas fundamentales en la conformación de uno de los movimientos agroecológicos más importantes y exitosos del mundo.
title: Waterproof sensor system for simultaneous pressure and hot-film flow measurements
Creators: name: Schwerter, Martin
name: Leester-Schädel, Monika
name: Dietzel, Andreas
Publisher: name: Elsevier BV
Year: 2017
Subjects: subject: pressure sensor, hot-film sensor, embedded sensor system, waterproof, integrated electronics, FPGA signal processing
subject: 621

description: For simultaneous measurement of pressure and near surface flow conditions allowing indirect determination of wall shear stress in experimental water tunnel environment an integrated hybrid sensor system has been developed. In contrast to known approaches, which are limited to the use in gas atmosphere due to protruding electrical and fragile parts, our sensor system is waterproof shielded and embedded in epoxy resin. Furthermore an amplification circuit for the pressure signal based on a programmable gain amplifier is integrated in direct vicinity to the pressure sensor in order to minimize noise by electromagnetic disturbances. Also sensor systems with on-board digitalization of the pressure signal for direct digital read-out were realized. We present all aspects of system assembly and embedding to one waterproof module. Furthermore, read-out strategies as well as sensor test results in air and water are shown and watertightness is confirmed.
description: Publications Institute of Microtechnology IMT
Sustained resonance: a binary system perturbed by gravitational radiation
Creators: name: Chicone, C.
name: Mashhoon, B.
name: Retzloff, D. G.
Publisher: name: arXiv
Year: 1999
Subjects: subject: General Relativity and Quantum Cosmology (gr-qc)
subject: Astrophysics (astro-ph)
subject: Chaotic Dynamics (nlin.CD)
subject: FOS: Physical sciences

description: The general phenomena associated with sustained resonance are studied in this paper in connection with relativistic binary pulsars. We represent such a system by two point masses in a Keplerian binary system that evolves via gravitational radiation damping as well as an external tidal perturbation. For further simplification, we assume that the external tidal perturbation is caused by a normally incident circularly polarized monochromatic gravitational wave. In this case, the second-order partially averaged equations are studied and a theorem of C. Robinson is employed to prove that for certain values of the physical parameters resonance capture followed by sustained resonance is possible in the averaged system. We conjecture that sustained resonance can occur in the physical system when the perturbing influences nearly balance each other.
description: 21 pages, 5 figures. To appear in Journal of Physics A
Nomada composita Mitchell 1962
Creators: name: Zarrillo, Tracy A.
name: Stoner, Kimberly A.
name: Ascher, John S.
Publisher: name: Zenodo
Year: 2025
Subjects: Biodiversity
Taxonomy
Animalia
Arthropoda
Insecta
Hymenoptera
Apidae
Nomada
Nomada composita

description: Nomada composita Mitchell, 1962: 408 (Connecticut holotype).
Holotype. Female USA: Connecticut: Litchfield Co.: Colebrook (MCZ).
Notes: Under-recorded due to identification difficulties, but S. Droege (pers. comm.) has recognized it from numerous sites across the region. However, material determined by him from New York and Canada proved on reexamination to pertain to two species one of which may be the morphospecies reported as Nomada sp. aff. composita Mitchell by Veit et al. (2022[“2021”]); see also Ascher et al. (2014) which differs in having an all red T 3 (lacking yellow lateral spots) and in having a wider prepygidial fimbria with yellower hairs (vs. narrower and more silvery in true N. composita) and subtle differences in spines at the apex of the hind femur. In Connecticut this species is best known from powerline ROW (Wagner et al. 2014a) where two voucher specimens confirmed to be true N. composita upon reexamination were found to vary in color, with one having small yellow sublateral spots on T 4 and some diffuse yellow on T 5 medially whereas the other had T 4- T 5 red.
description: Published as part of Zarrillo, Tracy A., Stoner, Kimberly A. & Ascher, John S., 2025, Biodiversity of Bees (Hymenoptera: Apoidea: Anthophila) in Connecticut (USA), pp. 1-138 in Zootaxa 5586 (1) on pages 92-93, DOI: 10.11646/zootaxa.5586.1.1, http://zenodo.org/record/14895883
Styling template v.6 September 2019
Creators: name: Grandfield, Virgil
Publisher: name: Zenodo
Year: 2018
Subjects: Journal Incubator Styling Template

description: To use, Select All and Copy the article you are working on, open this new Styles Template document, Paste your article using the Destination Theme. Then, do a Save As with a name for your article and begin your work. The Template is blank, but all of our styles, but all our most commonly used styles will be at the top of the Styles list on the toolbar, by alphabetic order in three categories (1 = most used, 2 = less, 3 = least). Any other styles not in the top three categories (or Headings above 5) will be in their usual place down the list. Please let me know if there is a style you frequently need that is not in the top three categories so that I can add it. I will also place this in our Workflowy Tools section (in Dropbox now until I can load it to Zenodo).
Axios/Ipsos Coronavirus Index Wave 47
Creators: name: Axios
Publisher: name: Roper Center for Public Opinion Research
Year: 2021

description: Changes in health in last week (2); activities in last week (7); changes in work and household over last few weeks (2); risk of different activities (14); safety procedures when leaving the house (8); concern about coronavirus (COVID-19) outbreak (1); trust in organizations/politicians to provide accurate information about coronavirus (6); coronavirus vaccine (20); coronavirus testing (4).
Some statistics about Tropical Sandpile Model
Creators: name: Kalinin, Nikita
name: Prieto, Yulieth
Publisher: name: arXiv
Year: 2019
Subjects: subject: Combinatorics (math.CO)
subject: Dynamical Systems (math.DS)
subject: FOS: Mathematics

description: Tropical sandpile model (or linearized sandpile model) is the only known continuous geometric model exhibiting self-organised criticality. This model represents the scaling limit behavior of a small perturbation of the maximal stable sandpile state on a big subset of $\mathbb Z^2$. Given a set $P$ of points in a compact convex domain $Ω\subset \mathbb R^2$ this linearized model produces a tropical polynomial $G_P{\bf 0}_Ω$.
 Here we present some quantitative statistical characteristics of this model and some speculative explanations. Namely, we study the dependence between the number $n$ of randomly dropped points $P=\{p_1,\dots,p_n\}\subset[0,1]^2=Ω$ and the degree of the tropical polynomial $G_{P}{\bf 0}_Ω$. We also study the distributions of the coefficients of $G_{P}{\bf 0}_Ω$ and the correlation between them. This paper's main (experimental) result is that the tropical curve $C(G_{P}{\bf 0}_Ω)$ defined by $G_{P}{\bf 0}_Ω$ is a small perturbation of the standard square grid lines. This explains a previously known fact that most of the edges of the tropical curve $C(G_{P}{\bf 0}_Ω)$ are of directions $(1,0),(0,1),(1,1),(-1,1)$.
 The main theoretical result is that $C(G_{P}{\bf 0}_Ω)\setminus (P\cap \partialΩ)$, i.e. the tropical curve in $Ω^\circ$ with marked points $P$ removed, is a tree.
The magnification of SN 1997ff, the farthest known Supernova
Creators: name: Benitez, Narciso
name: Riess, Adam G.
name: Nugent, Peter E.
name: Dickinson, Mark
name: Chornock, Ryan
name: Filippenko, Alexei V.
Publisher: name: arXiv
Year: 2002
Subjects: subject: Astrophysics (astro-ph)
subject: FOS: Physical sciences

description: With a redshift of z~1.7, SN 1997ff is the most distant type Ia supernova discovered so far. This SN is close to several bright, z=0.6-0.9 galaxies, and we consider the effects of lensing by those objects on the magnitude of SN 1997ff. We estimate their velocity dispersions using the Tully-Fisher and Faber-Jackson relations corrected for evolution effects,and calculate, applying the multiple-plane lensing formalism, that SN 1997ff is magnified by 0.34+-0.12 mag. Due to the spatial configuration of the foreground galaxies, the shear from individual lenses partially cancels out,and the total distortion induced on the host galaxy is considerable smaller than that produced by a single lens having the same magnification. After correction for lensing, the revised distance to SN 1997ff is m-M=45.5 mag, which improves the agreement with the Omega_M=0.35, Omega_Lambda = 0.65 cosmology expected from lower-redshift SNe Ia, and is inconsistent at the ~3 sigma confidence level with a uniform gray dust model or a simple evolution model.
description: 5 pages, 1 figure. Final version to appear in ApJL
Trade-offs in Static and Dynamic Evaluation of Hierarchical Queries
Creators: name: Kara, Ahmet
name: Nikolic, Milos
name: Olteanu, Dan
name: Zhang, Haozhe
Publisher: name: arXiv
Year: 2019
Subjects: subject: Databases (cs.DB)
subject: Logic in Computer Science (cs.LO)
subject: FOS: Computer and information sciences

description: We investigate trade-offs in static and dynamic evaluation of hierarchical queries with arbitrary free variables. In the static setting, the trade-off is between the time to partially compute the query result and the delay needed to enumerate its tuples. In the dynamic setting, we additionally consider the time needed to update the query result under single-tuple inserts or deletes to the database.

Our approach observes the degree of values in the database and uses different computation and maintenance strategies for high-degree (heavy) and low-degree (light) values. For the latter it partially computes the result, while for the former it computes enough information to allow for on-the-fly enumeration.

We define the preprocessing time, the update time, and the enumeration delay as functions of the light/heavy threshold. By appropriately choosing this threshold, our approach recovers a number of prior results when restricted to hierarchical queries.

We show that for a restricted class of hierarchical queries, our approach achieves worst-case optimal update time and enumeration delay conditioned on the Online Matrix-Vector Multiplication Conjecture.
Extended commutator algebra for the $q$-oscillator and a related Askey-Wilson algebra
Creators: name: Cantuba, Rafael Reno S.
Publisher: name: arXiv
Year: 2019
Subjects: subject: Rings and Algebras (math.RA)
subject: Quantum Algebra (math.QA)
subject: FOS: Mathematics
subject: 47L30, 17B60, 17B65, 16S15, 81R50

description: Let $q$ be a nonzero complex number that is not a root of unity. In the $q$-oscillator with commutation relation $ a a^+-qa^+ a =1$, it is known that the smallest commutator algebra of operators containing the creation and annihilation operators $a^+$ and $ a $ is the linear span of $a^+$ and $ a $, together with all operators of the form ${a^+}^l{\left[a,a^+\right]}^k$, and ${\left[a,a^+\right]}^k a ^l$, where $l$ is a nonnegative integer and $k$ is a positive integer. That is, linear combinations of operators of the form $ a ^h$ or $(a^+)^h$ with $h\geq 2$ or $h=0$ are outside the commutator algebra generated by $ a $ and $a^+$. This is a solution to the Lie polynomial characterization problem for the associative algebra generated by $a^+$ and $ a $. In this work, we extend the Lie polynomial characterization into the associative algebra $\mathcal{P}=\mathcal{P}(q)$ generated by $ a $, $a^+$, and the operator $e^{ωN}$ for some nonzero real parameter $ω$, where $N$ is the number operator, and we relate this to a $q$-oscillator representation of the Askey-Wilson algebra $AW(3)$.
Dynamic wormholes
Creators: name: Hayward, Sean A.
Publisher: name: arXiv
Year: 1998
Subjects: subject: General Relativity and Quantum Cosmology (gr-qc)
subject: FOS: Physical sciences

description: A new framework is proposed for general dynamic wormholes, unifying them with black holes. Both are generically defined locally by outer trapping horizons, temporal for wormholes and spatial or null for black and white holes. Thus wormhole horizons are two-way traversible, while black-hole and white-hole horizons are only one-way traversible. It follows from the Einstein equation that the null energy condition is violated everywhere on a generic wormhole horizon. It is suggested that quantum inequalities constraining negative energy break down at such horizons. Wormhole dynamics can be developed as for black-hole dynamics, including a reversed second law and a first law involving a definition of wormhole surface gravity. Since the causal nature of a horizon can change, being spatial under positive energy and temporal under sufficient negative energy, black holes and wormholes are interconvertible. In particular, if a wormhole's negative-energy source fails, it may collapse into a black hole. Conversely, irradiating a black-hole horizon with negative energy could convert it into a wormhole horizon. This also suggests a possible final state of black-hole evaporation: a stationary wormhole. The new framework allows a fully dynamical description of the operation of a wormhole for practical transport, including the back-reaction of the transported matter on the wormhole. As an example of a matter model, a Klein-Gordon field with negative gravitational coupling is a source for a static wormhole of Morris & Thorne.
description: 5 revtex pages, 4 eps figures. Minor change which did not reach publishers
String Indexing with Compressed Patterns
Creators: name: Bille, Philip
name: Gørtz, Inge Li
name: Steiner, Teresa Anna
Publisher: name: arXiv
Year: 2019
Subjects: subject: Data Structures and Algorithms (cs.DS)
subject: FOS: Computer and information sciences

description: Given a string $S$ of length $n$, the classic string indexing problem is to preprocess $S$ into a compact data structure that supports efficient subsequent pattern queries. In this paper we consider the basic variant where the pattern is given in compressed form and the goal is to achieve query time that is fast in terms of the compressed size of the pattern. This captures the common client-server scenario, where a client submits a query and communicates it in compressed form to a server. Instead of the server decompressing the query before processing it, we consider how to efficiently process the compressed query directly. Our main result is a novel linear space data structure that achieves near-optimal query time for patterns compressed with the classic Lempel-Ziv compression scheme. Along the way we develop several data structural techniques of independent interest, including a novel data structure that compactly encodes all LZ77 compressed suffixes of a string in linear space and a general decomposition of tries that reduces the search time from logarithmic in the size of the trie to logarithmic in the length of the pattern.
description: Accepted journal version
Solution of few-body problems with the stochastic variational method: I. Central forces
Creators: name: Varga, K.
name: Suzuki, Y.
Publisher: name: arXiv
Year: 1997
Subjects: subject: Nuclear Theory (nucl-th)
subject: Condensed Matter (cond-mat)
subject: High Energy Physics - Phenomenology (hep-ph)
subject: FOS: Physical sciences

description: This paper presents a fortran program to solve diverse few-body problems with the stochastic variational method. Depending on the available computational resources the program is applicable for $N=2-3-4-5-6-...$-body systems with $L=0$ total orbital momentum. The solution with the stochastic variational method is ``automatic'' and universal. One defines the system (number of particles, masses, symmetry, interaction, etc. ) and the program finds the ground state energy and wave function. The examples include nuclear (alpha particle: four-body, $^6$He: six-body), atomic (td$μ^-$ and $e^+e^-e^+e^-$) and subnuclear (the nucleon and the delta in a nonrelativistic quark model) systems. The solutions are accurate for excited states as well, and even the Efimov-states can be studied. The program is available from the author (e-mail:varga@rikaxp.riken.go.jp).
description: Description of a computer program. 19 pages, latex
Constraints on the low frequency spectrum of FRB 121102
Creators: name: Houben, L. J. M.
name: Spitler, L. G.
name: ter Veen, S.
name: Rachen, J. P.
name: Falcke, H.
name: Kramer, M.
Publisher: name: arXiv
Year: 2019
Subjects: subject: High Energy Astrophysical Phenomena (astro-ph.HE)
subject: FOS: Physical sciences

description: While repeating fast radio bursts (FRBs) remain scarce in number, they provide a unique opportunity for follow-up observations that enhance our knowledge of their sources and potentially of the FRB population as a whole. Attaining more burst spectra could lead to a better understanding of the origin of these bright, millisecond-duration radio pulses. We therefore performed $\sim$20 hr of simultaneous observations on FRB 121102 with the Effelsberg 100-m radio telescope and the Low Frequency Array (LOFAR) to constrain the spectral behaviour of bursts from FRB 121102 at 1.4 GHz and 150 MHz. This campaign resulted in the detection of nine new bursts at 1.4 GHz but no simultaneous detections with LOFAR. Assuming that the ratio of the fluence at two frequencies scales as a power law, we placed a lower limit of $α$ > -1.2 $\pm$ 0.4 on the spectral index for the fluence of the instantaneous broad band emission of FRB 121102. For the derivation of this limit, a realistic fluence detection threshold for LOFAR was determined empirically assuming a burst would be scattered as predicted by the NE2001 model. A significant variation was observed in the burst repeat rate R at L-band. During observations in September 2016, nine bursts were detected, giving R = 1.1 $\pm$ 0.4 hr$^{-1}$, while in November no bursts were detected, yielding R < 0.3 hr$^{-1}$ (95% confidence limit). This variation is consistent with earlier seen episodic emission of FRB 121102. In a blind and targeted search, no bursts were found with LOFAR at 150 MHz, resulting in a repeat rate limit of R < 0.16 hr$^{-1}$ (95% confidence limit). Burst repeat rate ratios of FRB 121102 at 3, 2, 1.4, and 0.15 GHz are consistent within the uncertainties with a flattening of its spectrum below 1 GHz.
description: 8 pages, 2 tables, 1 figure
title: Surface reconstruction by means of a flexible sensor array
Creators: name: Koch, Eugen
name: Dietzel, Andreas
Publisher: name: Elsevier BV
Year: 2017
Subjects: subject: surface reconstruction, topography capturing, flexible systems, systems-in-foil, sensor array, curvature sensing
subject: 621

description: In recent years, an increasing popularity of flexible sensor systems has been observed, which can largely be attributed to their ability to continuously adapt the shape to deformable bodies with non-planar surfaces without losing functionality. In this paper, we present a self-sensing, ultra-thin and flexible sensor array foil, which allows for determining its actual shape by analyzing signals from 6x6 sensors. Raw sensor signals clearly show the dependence from strength and direction of bending. The local bending vector is determined from signals of sensors oriented in different directions using rules which are already applied for strain gauge rosettes. The algorithm for the surface reconstruction divides the sensor foil into discrete bending segments for which the bending and subsequently new coordinates of segment edges are determined. A sensor diagnostics routine intercepts failure of the complete system due to the failure of single sensors. The functionality of the sensor array and the surface reconstruction is demonstrated for a foil subsequently adapting to a tube in different orientations. The obtained surface reconstruction clearly correlates with the visually observed bending. Such surface reconstruction could provide diagnostic information and potentially be used to detect diseases like pneumothorax. It could not only help to improve medical treatments but also to monitor the structural health of technical constructions.
description: Publications Institute of Microtechnology IMT
title: Respiratory trigger signal generation by means of a stretchable sensor array
Creators: name: Koch, Eugen
name: Dietzel, Andreas
Publisher: name: Elsevier BV
Year: 2018
Subjects: subject: 621

description: Respiratory monitoring is a clinical method which helps to examine the medical condition of patients. Patients diagnosed with types of respiratory distress are often supported through artificial respiration. To be able to adapt and synchronize airway pressures and flows to the patient’s own breathing for improved respiration efficiency, intelligent sensors are needed to detect the beginning and ending of the breathing cycle. An ultra-thin and stretchable 6x6 sensor array with skin-like properties is presented that is used to generate a trigger signal which is suitable to control and synchronize artificial respiration with the patient's own breathing. Stretchability of the sensor array is achieved by fs-laser structuring of the thin polyimide sensor substrate resulting in small sensor islands connected via slender meandering electrical leads. The resulting stretchable sensor grid is embedded in layers of PDMS whereby a skin-friendly sensor patch is created. To simulate respiration an externally ventilated dummy is used. The principle of trigger signal generation from multiple sensor signals is based on a self-developed algorithm that first evaluates the signal quality of each sensor based on adjustable parameters. Only the sensors selected as suitable are then used to calculate an averaged scaled signal, which is taken for trigger point detection. The best results were typically obtained when quality factures are set to a level where about half of the sensors are contributing to the trigger detection, leading to a trigger delay of about 80 ms relative to the pressure reference signal. It could also be shown that the algorithm can resume the trigger point detection within 2-3 seconds, after manually applying disturbances which could similarly occur in the clinical environment. The results show that the skin-friendly sensor patch provides suitable trigger signals for artificial respiration which are robust against drop out of single sensors, non-ideal sensor patch positioning on the thorax and mechanical irritations.
description: Publications Institute of Microtechnology IMT
Kaiser Family Foundation Poll: February 2019 Kaiser Health Tracking Poll
Creators: name: Kaiser Family Foundation
Publisher: name: Roper Center for Public Opinion Research
Year: 2019

description: Affordable Care Act (ACA), Obamacare favorability (1); favor/oppose Medicare-for-all (1); prescription drugs have made lives better/worse (2); cost of prescription drugs (1); prescription drug prices in US vs. Canada and Western Europe (2); confidence in safety of prescription drugs in US (1); trust in pharmaceutical companies (5); opinion of prescription drug regulation (2); government regulation/competition among companies would do better job at keeping drug costs down (1); favor/oppose various actions to keep drug costs down (9); federal government does/does not negotiate with drug companies for lower Medicare drug prices (2); arguments against federal government negotiating Medicare drug prices (5); factors contributing to prescription drug prices (4); health insurance coverage (5); prescription drug coverage (4); problems with health insurance plan (3); choosing prescription drug or insurance plan (3); currently take prescription medicine (7); paying for prescription drugs (3); not taking prescription as recommended because of cost (5); prescription discount (3); health condition (1); pre-existing conditions (1); chronic health conditions (1); President Donald Trump job performance (1).
title: Skin attachable flexible sensor array for respiratory monitoring
Creators: name: Koch, Eugen
name: Dietzel, Andreas
Publisher: name: Elsevier BV
Year: 2016
Subjects: subject: 621

description: Flexible electronic systems became increasingly popular in recent years. They usually can be bent or even stretched while fully maintaining their functionality opening up a wide field of various new applications. In this paper a novel 6x6 sensor array for curvature sensing in the format of a thin flexible polyimide foil is introduced. The sensor foil is to be used for respiratory monitoring of premature infants by directly attaching it to the skin for measuring the body deformations caused by breathing. Sensor signals shall in future be used not only to trigger the respirator but also to provide time dependent body surface reconstruction as a diagnostic tool. One single sensor element consists of four gold strain gauges in a Wheatstone bridge configuration. For suppressing sensor response to foil stretching and for increasing bending sensitivity we introduced a double-sided sensor design with strain gauges on both surfaces of the thin foil leading to a 170 % higher sensitivity than a one-sided sensor design. The complete sensor array foil of less than 20 μm in thickness can be fabricated without flipping the substrate. Fully functional sensor foils were characterized with respect to sensitivity, dependence between bending orientation and sensor matrix output signals. Double sided sensor elements with different orientations are arranged in an alternating pattern across the array allowing to fully and unambiguously determine the bending vector utilizing plausibility considerations on basis of signals from neighboring elements. A small initial bending resulting from fabrication induced stresses was observed but could easily be compensated in digital sensor signal analysis. In summary, our first tests of this novel sensor array together with the scalability of implemented fabrication processes are very promising and meet the fundamental criteria to be used as sensor array for respiratory monitoring of infants.
description: Publications Institute of Microtechnology IMT
Nomada maculata Cresson 1863
Creators: name: Zarrillo, Tracy A.
name: Stoner, Kimberly A.
name: Ascher, John S.
Publisher: name: Zenodo
Year: 2025
Subjects: Biodiversity
Taxonomy
Animalia
Arthropoda
Insecta
Hymenoptera
Apidae
Nomada
Nomada maculata

description: Nomada maculata Cresson, 1863: 303 (Connecticut lectotype designated by Cresson, 1916).
Lectotype. USA: Connecticut: Female, [ex coll. E. Norton?] (ANSP).
Notes: One of the most abundant Nomada species in the region, likely reflecting an association with common Andrena (Melandrena) hosts, likely including Andrena vicina. Habitat associations in Connecticut include powerline ROW, coastal beaches, agricultural land, inland dunes and sandplain remnants, suburban neighborhoods, and field edges.
description: Published as part of Zarrillo, Tracy A., Stoner, Kimberly A. & Ascher, John S., 2025, Biodiversity of Bees (Hymenoptera: Apoidea: Anthophila) in Connecticut (USA), pp. 1-138 in Zootaxa 5586 (1) on page 95, DOI: 10.11646/zootaxa.5586.1.1, http://zenodo.org/record/14895883
Theory of two-pion photo- and electroproduction off the nucleon
Creators: name: Haberzettl, Helmut
name: Nakayama, Kanzo
name: Oh, Yongseok
Publisher: name: arXiv
Year: 2018
Subjects: subject: Nuclear Theory (nucl-th)
subject: High Energy Physics - Phenomenology (hep-ph)
subject: Nuclear Experiment (nucl-ex)
subject: FOS: Physical sciences

description: A theory of two-pion photo- and electroproduction off the nucleon is derived considering all explicit three-body mechanisms of the interacting $ππN$ system. The full three-body dynamics of the interacting $ππN$ system is accounted for by the Faddeev-type ordering structure of the Alt-Grassberger-Sandhas equations. The formulation is valid for hadronic two-point and three-point functions dressed by arbitrary internal mechanisms provided all associated electromagnetic currents are constructed to satisfy their respective (generalized) Ward-Takahashi identities. It is shown that coupling the photon to the Faddeev structure of the underlying hadronic two-pion production mechanisms results in a natural expansion of the full two-pion photoproduction current $M_{ππ}^μ$ in terms of multiple dressed loops involving two-body subsystem scattering amplitudes of the $ππN$ system that preserves gauge invariance as a matter of course order by order in the number of (dressed) loops. A closed-form expression is presented for the entire gauge-invariant current $M_{ππ}^μ$ with complete three-body dynamics. Individually gauge-invariant truncations of the full dynamics most relevant for practical applications at the no-loop, one-loop, and two-loop levels are discussed in detail. An approximation scheme to the full two-pion amplitude for calculational purposes is also presented. It approximates, systematically, the full amplitude to any desired order of expansion in the underlying hadronic two-body amplitude. Moreover, it allows for the approximate incorporation of all neglected higher-order mechanisms in terms of a phenomenological remainder current. The effect and phenomenological usefulness of this remainder current is assessed in a tree-level calculation of the $γN \to K K Ξ$ reaction.
description: 33 pages, 34 figures