cometadata/datacite-rtg-text-other-reclassification-records huggingface dataset:
GAUFRE: a tool for an automated determination of atmospheric parameters from spectroscopy
Creators: name: Valentini, Marica
name: Morel, Thierry
name: Miglio, Andrea
name: Fossati, Luca
name: Munari, Ulisse
Publisher: name: arXiv
Year: 2013
Subjects: subject: Solar and Stellar Astrophysics (astro-ph.SR)
subject: FOS: Physical sciences

description: We present an automated tool for measuring atmospheric parameters (T_eff, log(g), [Fe/H]) for F-G-K dwarf and giant stars. The tool, called GAUFRE, is written in C++ and composed of several routines: GAUFRE-RV measures radial velocity from spectra via cross-correlation against a synthetic template, GAUFRE-EW measures atmospheric parameters through the classic line-by-line technique and GAUFRE-CHI2 performs a chi^2 fitting to a library of synthetic spectra. A set of F-G-K stars extensively studied in the literature were used as a benchmark for the program: their high signal-to-noise and high resolution spectra were analysed by using GAUFRE and results were compared with those present in literature. The tool is also implemented in order to perform the spectral analysis after fixing the surface gravity (log(g)) to the accurate value provided by asteroseismology. A set of CoRoT stars, belonging to LRc01 and LRa01 fields was used for first testing the performances and the behaviour of the program when using the seismic log(g).
description: 7 pages, 3 figures, to appear in proceedings of 40th Liege International Astrophysical Colloquium 'Ageing low-mass stars: from red giants to white dwarfs'
Word definition skills in elementary school children – The contribution of bilingualism, cognitive factors, and social factors
Creators: name: Rosqvist, Ida
name: Andersson, Ketty
name: Sandgren, Olof
name: Lyberg-Åhlander, Viveka
name: Hansson, Kristina
name: SahlÉn, Birgitta
Publisher: name: Taylor & Francis
Year: 2022
Subjects: subject: Sociology
subject: FOS: Sociology
subject: 69999 Biological Sciences not elsewhere classified
subject: FOS: Biological sciences
subject: Science Policy

description: Purpose: Vocabulary relates to overall language proficiency and is important for academic success. Word definition (WD) tasks can be used to assess vocabulary depth and definition skills. We investigate monolingual and bilingual children’s performances on a WD task, and how bilingualism, level of parental education, school characteristics (proportion of students with Swedish as second language and proportion of parents with tertiary education), CELF-4 Core Language Score, and non-verbal IQ contribute to their performance. We also evaluate the level of difficulty of the test items and the test’s internal consistency. Method: Two hundred and eight children (mean age 7:8, range 6:8–9:0) were assessed with a 10-item WD task. Amount of information included in the definitions gave the WD score and number of words with at least partially correct information gave a Word knowledge score. Result: The bilingual group had lower scores on both measures. In isolation bilingualism explained 15% of the variance of the WD score. With all background factors included, the only significant predictor was CELF-4 Core Language Score, uniquely explaining 24.3% of the variance. Response patterns on the WD score were similar between groups. Internal consistency was > α = 0.7 for both measurements. Conclusion: Bilingual children performed lower than monolingual children on a WD task, but bilingualism alone cannot explain poor results.
Physical rehabilitation of central facial palsy: A survey of current multidisciplinary practice
Creators: name: Vaughan, Annabelle
name: Copley, Anna
name: Miles, Anna
Publisher: name: Taylor & Francis
Year: 2021
Subjects: Medicine
Cell Biology
Molecular Biology
Biotechnology
Science Policy

description: Purpose: The role of allied health practitioners providing physical rehabilitation of central facial palsy (CFP) is minimally reported in the literature. This study explores current practice and the roles, attitudes and perceptions of allied health professionals (AHPs) working with people with CFP. Method: An electronic survey was distributed to speech-language pathologists (SLPs), occupational therapists and physiotherapists. Responses (n = 78) were analysed using qualitative and quantitative methods. Result: SLPs often lead management of CFP; however, their role is not clearly defined nor well recognised. Several barriers were identified which prevent AHPs from providing consistent specialist rehabilitation to people with CFP. These included a lack of training, no clear delegation of role, limited evidence and lack of resources. Conclusion: Survey respondents viewed CFP to be within SLP scope of practice; although, ownership of management varies between countries and professions. Most SLPs recognise the negative impact of CFP and feel a sense of responsibility to provide assessment and treatment of this impairment, but many barriers to doing so have been identified. Suggestions to improve access to rehabilitation for people with CFP included increased access to training for SLPs, more evidence, clinical practice guidelines and more clinical resources. Further research is required to ensure people suffering from CFP can access services that provide skilled management of their impairment.
Fisher-Hartwig expansion for Toeplitz determinants and the spectrum of a single-particle reduced density matrix for one-dimensional free fermions
Creators: name: Ivanov, Dmitri A.
name: Abanov, Alexander G.
Publisher: name: arXiv
Year: 2013
Subjects: subject: Mesoscale and Nanoscale Physics (cond-mat.mes-hall)
subject: Statistical Mechanics (cond-mat.stat-mech)
subject: Mathematical Physics (math-ph)
subject: Quantum Physics (quant-ph)
subject: FOS: Physical sciences

description: We study the spectrum of the Toeplitz matrix with a sine kernel, which corresponds to the single-particle reduced density matrix for free fermions on the one-dimensional lattice. For the spectral determinant of this matrix, a Fisher--Hartwig expansion in the inverse matrix size has been recently conjectured. This expansion can be verified order by order, away from the line of accumulation of zeros, using the recurrence relation known from the theory of discrete Painleve equations. We perform such a verification to the tenth order and calculate the corresponding coefficients in the Fisher-Hartwig expansion. Under the assumption of the validity of the Fisher-Hartwig expansion in the whole range of the spectral parameter, we further derive expansions for an equation on the eigenvalues of this matrix and for the von Neumann entanglement entropy in the corresponding fermion problem. These analytical results are supported by a numerical example.
description: 10 pages, minor typos corrected, corresponds to published version
The Fifth Conference of Italian Archaeology: Settlement and Economy, 1500B.C. - A.D. 1500. University of Oxford, Department for Continuing Education, Rewley House, Oxford, 11-13 December 1992. Ein Tagungsbericht
Creators: name: Teegen, Wolf-Rüdiger
Publisher: name: DGUF e.V.
Year: 2017

description: [nicht vorhanden / not available]
description: Archäologische Informationen, Bd. 16, Nr. 1 (1993): Archäologische Informationen
title: Awatarariki catchment debris flow early warning system framework
Creators: name: Massey, Chris I.
name: Potter, Sally H.
name: Leonard, Graham S.
Publisher: name: GNS Science
Year: 2020

description: In 2005, a large debris flow occurred in the Awatarariki catchment, above the township of Matatā, in the North Island of New Zealand. The debris flow damaged homes and infrastructure in Matatā. Risk assessments have been carried out by Tonkin & Taylor, and the calculated annual individual fatality risk to dwelling occupants in the area affected by debris flow hazards has been assessed as being intolerable by Whakatāne District Council (WDC) and most of the local community. In November 2019, GNS Science was commissioned by WDC to scope out the potential design and effectiveness-evaluation framework for a public-facing Early Warning System (EWS) for debris flows on the Awatarariki Fan, Matatā. As part of this work, GNS Science was asked to identify any initially obvious issues that could reduce the effectiveness of the EWS (i.e. ‘show stoppers’) and whether an EWS would be suitable/unsuitable for the Council to consider as an option to manage the risk. This report evaluates a multi-staged debris flow EWS based on the proposed design and effectiveness framework. Results from the three scenarios discussed indicate that a multi stage EWS is unlikely to allow all potential people present in the hazard zone at the time that a debris flow event is initiated to evacuate to safe areas. Therefore, people who do not or cannot evacuate would continue to be exposed to the risk levels calculated by Tonkin & Taylor, depending on their location on the fan. Given the uncertainties associated with a debris flow EWS, as listed in this report, adopting such a system as the means to mitigate the risk to people living on the fan is not aligned with taking a precautionary approach, as stated in Section 1.7 of the Bay of Plenty Regional Council’s Regional Policy Statement. In writing this report, our thoughts are with everyone effected by the debris flow in 2005. This was a traumatic event, and many have experienced ongoing difficulties in recovery. We acknowledge these past and current residents and property owners, as well as any future potential users of the land. (auth)
Besiedlungsspuren um die Zeitenwende in der Niederrheinischen Lößbörde. Eisenzeitliche Siedlungsbefunde und Brandgräber aus frührömischer Zeit in Welldorf, Kreis Düren (Fundstelle Hambach 503)
Creators: name: Lochner, Ina
Publisher: name: DGUF e.V.
Year: 2017

description: [nicht vorhanden / not available]
description: Archäologische Informationen, Bd. 18, Nr. 2 (1995): Archäologische Informationen
Firmenarchäologie - Landesarchäologie. Unterschiedliche Leitbilder - unterschiedliche Ergebnisse
Creators: name: Tellenbach, Michael
Publisher: name: DGUF e.V.
Year: 2017

description: [nicht vorhanden / not available]
description: Archäologische Informationen, Bd. 21, Nr. 2 (1998): Archäologische Informationen
Andreas Heege: Hambach 500. Villa rustica und früh- bis hochmittelalterliche Siedlung Wüstweiler (Gemeinde Niederzier), Kreis Düren, 1997
Creators: name: Quast, Dieter
Publisher: name: DGUF e.V.
Year: 2017

description: Rezension zu: Andreas Heege: Hambach 500. Villa rustica und früh- bis hochmittelalterliche Siedlung Wüstweiler (Gemeinde Niederzier), Kreis Düren, mit einem Beitrag von Karl-Heinz Knörzer. Rheinische Ausgr. 41. Rheinland-Verlag. Köln/Bonn 1997. 2 6 0 Seiten mit 45 Abbildungen und 26 Tabellen, 226 Tafeln und 9 Beilagen.
description: Archäologische Informationen, Bd. 22, Nr. 2 (1999): Archäologische Informationen
Gauge symmetry and Virasoro algebra in quantum charged rigid membrane -- a first order formalism
Creators: name: Paul, Biswajit
Publisher: name: arXiv
Year: 2012
Subjects: subject: High Energy Physics - Theory (hep-th)
subject: General Relativity and Quantum Cosmology (gr-qc)
subject: FOS: Physical sciences

description: The quantum charged rigid membrane model, which is a higher derivative theory has been considered to explore its gauge symmetries using a recently developed first order formalism \cite{BMP}. Hamiltonian analysis has been performed and the gauge symmetry of the model is identified as reparametrisation symmetry. First class constraints are shown to have a truncated Virasoro algebraic structure. An exact correspondence between the higher derivative theory and the first order formalism has been shown from the point of view of equations of motion.
description: Latex, 13 pages, minor changes in introduction, references added
Allometry and Dissipation of Ecological Flow Networks
Creators: name: Zhang, Jiang
name: Wu, Lingfei
Publisher: name: arXiv
Year: 2013
Subjects: subject: Populations and Evolution (q-bio.PE)
subject: Biological Physics (physics.bio-ph)
subject: FOS: Biological sciences
subject: FOS: Physical sciences

description: An ecological flow network is a weighted directed graph in which nodes are species, edges are "who eats whom" relationships and weights are rates of energy or nutrients transfer between species. Allometric scaling is a ubiquitous feature for flow systems like river basins, vascular networks and food webs. By "ecological network analysis" method, we can reveal the hidden allometry directly on the original flow networks without cutting edges. On the other hand, dissipation law, which is another significant scaling relationship between the energy dissipation (respiration) and the throughflow of any species is also discovered on the collected flow networks. Interestingly, the exponents of allometric law ($η$) and the dissipation law ($γ$) have a strong connection for both empirical and simulated flow networks. The dissipation law exponent $γ$ rather than the topology of the network is the most important ingredient to the allometric exponent $η$. By reinterpreting $η$ as the inequality of species impacts (direct and indirect influences) to the whole network along all energy flow pathways but not the energy transportation efficiency, we found that as $γ$ increases, the relative energy loss of large nodes (with high throughflow) increases, $η$ decreases, and the inequality of the whole flow network as well as the relative importance of large species decreases. Therefore, flow structure and thermodynamic constraint are connected.
description: 35 pages, 13 figures
Hadroproduction of $Υ(nS)$ above $B\bar B$ Thresholds and Implications for $Y_b(10890)$
Creators: name: Ali, Ahmed
name: Hambrock, Christian
name: Wang, Wei
Publisher: name: arXiv
Year: 2013
Subjects: subject: High Energy Physics - Phenomenology (hep-ph)
subject: High Energy Physics - Experiment (hep-ex)
subject: FOS: Physical sciences

description: Based on the non-relativistic QCD factorization scheme, we study the hadroproduction of the bottomonium states $Υ(5S)$ and $Υ(6S)$. We argue to search for them in the final states $Υ(1S,2S,3S)π^+π^-$, which are found to have anomalously large production rates at $Υ(5S)$. The enhanced rates for the dipionic transitions in the $Υ(5S)$-energy region could, besides $Υ(5S)$, be ascribed to $Y_b(10890)$, a state reported by the Belle collaboration, which may be interpreted as a tetraquark. The LHC/Tevatron measurements are capable of making a case in favor of or against the existence of $Y_b(10890)$, as demonstrated here. Dalitz analysis of the $Υ(1S,2S,3S)π^+π^-$ states from the $Υ(5S)/Y_b(10890)$ decays also impacts directly on the interpretation of the charged bottomonium-like states, $Z_b(10600)$ and $Z_b(10650)$, discovered by Belle in these puzzling decays.
description: 6 pages, 2 figures; v2: new estimates of color-octet contributions, and comparison with the recent CMS data
"exar" - "Europäische Vereinigung zur Förderung der Experimentellen Archäologie" (European Association for the advencement of archaeology by experiment)
Creators: name: Fansa, Mamoun
Publisher: name: DGUF e.V.
Year: 2017

description: [nicht vorhanden / not available]
description: Archäologische Informationen, Bd. 26, Nr. 1 (2003): Archäologische Informationen
Discrete Mechanical Interpolation of Keyframes
Creators: name: Yang, Weiwei
Publisher: name: California Institute of Technology
Year: 2008
Subjects: directable animation
key frame interpolation
discrete mechanics
physically based simulation
Computer Science

description: Advances in computer hardware and software have made it possible to use  physical simulation methods to add unprecedented degrees of realism to computer animations. Unfortunately, the reliance on such methods makes it difficult or even impossible to control the results in order to achieve artistic goals.  We present a method for allowing artistic control of physical realism by interpolating between given keyframes. The method is based on the discrete Lagrange-d'Alembert principle; we introduce additional "ghost forces" that are calculated to bring the system into the configuration requested by the artist. We derive a cost function that when minimized ensures the corresponding motion to be smooth and physical looking.  We describe the implementation and show an example of animating a multi-particle mass-spring system in 3D using our method.
Searching for Minimum Storage Regenerating Codes
Creators: name: Cullina, Daniel Francis
Publisher: name: California Institute of Technology
Year: 2009
Subjects: Electrical Engineering

description: Regenerating codes allow distributed storage systems to recover from the loss of a storage node while transmitting the minimum possible amount of data across the network. We search for examples of Minimum Storage Regenerating Codes. To exhaustively search the space of potential codes, we reduce the potential search space in several ways. We impose an additional symmetry condition on codes that we consider. We specify codes in a simple alternative way, using additional recovered coefficients rather than transmission coefficients. We place codes into equivalence classes to avoid redundant checking. We find MSR codes for the parameters n = 5 and k = 3 in various fields. We demonstrate that it is possible for such codes to be composed of vectors in general position.
title: Complex Trophic Interactions in an Acidophilic Microbial Community
Creators: name: Weithoff, Guntram
name: Bell, Elanor Margaret
Publisher: name: Universitätsverlag Potsdam
Year: 2022
Subjects: subject: 570 Biowissenschaften; Biologie

description: Extreme habitats often harbor specific communities that differ substantially from non-extreme habitats. In many cases, these communities are characterized by archaea, bacteria and protists, whereas the number of species of metazoa and higher plants is relatively low. In extremely acidic habitats, mostly prokaryotes and protists thrive, and only very few metazoa thrive, for example, rotifers. Since many studies have investigated the physiology and ecology of individual species, there is still a gap in research on direct, trophic interactions among extremophiles. To fill this gap, we experimentally studied the trophic interactions between a predatory protist (Actinophrys sol, Heliozoa) and its prey, the rotifers Elosa woralli and Cephalodella sp., the ciliate Urosomoida sp. and the mixotrophic protist Chlamydomonas acidophila (a green phytoflagellate, Chlorophyta). We found substantial predation pressure on all animal prey. High densities of Chlamydomonas acidophila reduced the predation impact on the rotifers by interfering with the feeding behaviour of A. sol. These trophic relations represent a natural case of intraguild predation, with Chlamydomonas acidophila being the common prey and the rotifers/ciliate and A. sol being the intraguild prey and predator, respectively. We further studied this intraguild predation along a resource gradient using Cephalodella sp. as the intraguild prey. The interactions among the three species led to an increase in relative rotifer abundance with increasing resource (Chlamydomonas) densities. By applying a series of laboratory experiments, we revealed the complexity of trophic interactions within a natural extremophilic community.
description: Zweitveröffentlichungen der Universität Potsdam : Mathematisch-Naturwissenschaftliche Reihe; 1276
On the efficiency at maximum cooling power
Creators: name: Apertet, Yann
name: Ouerdane, Henni
name: Michot, Aurelie
name: Goupil, Christophe
name: Lecoeur, Philippe
Publisher: name: arXiv
Year: 2013
Subjects: subject: Statistical Mechanics (cond-mat.stat-mech)
subject: Classical Physics (physics.class-ph)
subject: FOS: Physical sciences

description: The efficiency at maximum power (EMP) of heat engines operating as generators is one corner stone of finite-time thermodynamics, the Curzon-Ahlborn efficiency $η_{\rm CA}$ being considered as a universal upper bound. Yet, no valid counterpart to $η_{\rm CA}$ has been derived for the efficiency at maximum cooling power (EMCP) for heat engines operating as refrigerators. In this Letter we analyse the reasons of the failure to obtain such a bound and we demonstrate that, despite the introduction of several optimisation criteria, the maximum cooling power condition should be considered as the genuine equivalent of maximum power condition in the finite-time thermodynamics frame. We then propose and discuss an analytic expression for the EMCP in the specific case of exoreversible refrigerators.
Sensitivity of the LHC to Kaluza-Klein gluon in two b-jets decay channel
Creators: name: Arai, Masato
name: Cho, Gi-Chol
name: Smolek, Karel
name: Yoneyama, Kyoko
Publisher: name: arXiv
Year: 2013
Subjects: subject: High Energy Physics - Phenomenology (hep-ph)
subject: FOS: Physical sciences

description: We study a possibility of observation of the first Kaluza-Klein (KK) excitation of gluon in a warped extra dimension model at the LHC. In our analysis, we adopt the KK gluon mass and the b-quark coupling to the KK gluon as model parameters and study the sensitivity of the ATLAS experiment to observe the KK gluon through the two $b$-jets channel.
description: Contribution to the proceedings of the Hadron Collider Physics Symposium 2012
Artefakte aus organischem Hartmaterial aus endneolithischen Gräbern in Mitteldeutschland. Untersuchungen am Beispiel der Schnurkeramik
Creators: name: Petzold, Uwe
Publisher: name: DGUF e.V.
Year: 2017

description: [nicht vorhanden / not available]
description: Archäologische Informationen, Bd. 26, Nr. 1 (2003): Archäologische Informationen
Prenolepis obscura , Mayr
Creators: name: Forel, A.
Publisher: name: L'Imprimerie Nationale
Year: 1891
Subjects: Biodiversity
Taxonomy
Animalia
Arthropoda
Insecta
Hymenoptera
Formicidae
Prenolepis
Prenolepis obscura

description: [[male]]. Prenolepis obscura, Mayr
(pl. II, fig. 12, 12a et 12b).- Valvules génitales larges et courtes, surtout les extérieures, dont le bord terminal est échancré. L'échancrure est bornée par deux angles assez également proéminents, l'un presque droit et l'autre arrondi (ce dernier correspondant à la dent des P. vividula et P. bourbonica). Les deux prolongements des valvules moyennes sont à peu près de même longueur, mais l'interne est environ trois fois large comme l'externe. Ce dernier est convexe en dehors, concave en dedans, terminé par une pointe arrondie très obtuse. Sur sa concavité, près de l'extrémité, trois rangées de petites dents obtuses ou verrues. Le prolongement interne est en large gouttière, comme chez les P. Ellisii et P. Braueri, race Humbloti, mais il a un bord terminal bien marqué, presque perpendiculaire aux deux côtés. L'un des angles de ce bord terminal se termine en un long bec courbé, concave et pointu. L'autre angle est une courbe arrondie dentelée, ainsi que tout le bord terminal lui-même. A partir de ces dentelures marginales, la surface concave de la gouttière est tapissée, sur l'espace d'un quart environ de sa surface totale, de trois ou quatre rangées contiguës de petites dents ou verrues. Les valvules intérieures ont un long côté convexe et deux autres séparés par un angle très obtus et arrondi. Ils sont tous deux très faiblement subdentelés (d'Australie).
description: Published as part of Forel, A., 1891, Histoire naturelle des Hymenopteres. Deuxieme partie: Les Formicides., pp. 1-231 in Histoire Physique, Naturelle et Politique de Madagascar., Paris :L'Imprimerie Nationale on page 93, DOI: 10.5281/zenodo.9896
MODULATION OF HOST ACTIN CYTOSKELETON BY THE LEGIONELLA EFFECTOR RAVJ
Creators: name: Liu, Yan
Publisher: name: Purdue University Graduate School
Year: 2022
Subjects: Infectious agents

description: The actin cytoskeleton is involved in many essential cellular events such as mitosis, cell migration, control of epithelial barrier function, and adherence of immune cells. Given the essential roles of the actin cytoskeleton, it is not surprising that it is a common target for bacterial virulence factors. Legionella pneumophila, the causative agent of Legionnaire’s pneumonia, establishes a replicative compartment using effectors secreted by its Dot/Icm secretion system. At least four Dot/Icm effectors, VipA, Ceg14, LegK2 and RavK have been shown to modulate the host actin cytoskeleton. Here, we identified RavJ (lpg0944) as an additional effector that interferes with the actin cytoskeleton in mammalian cells. We demonstrated that RavJ is a transglutaminase that functions to induce crosslink between actin and members of the Motin protein family, leading to inhibition of the binding between actin and ADF/cofilin. We also found that LegL1 (lpg0945) is a metaeffector of RavJ, which suppresses the transglutaminase activity of RavJ by blocking its enzymatic domain.
Physical momentum representation of scalar field correlators in de Sitter space
Creators: name: Parentani, R.
name: Serreau, J.
Publisher: name: arXiv
Year: 2012
Subjects: subject: High Energy Physics - Theory (hep-th)
subject: General Relativity and Quantum Cosmology (gr-qc)
subject: High Energy Physics - Phenomenology (hep-ph)
subject: Nuclear Theory (nucl-th)
subject: FOS: Physical sciences

description: We propose a new approach to compute correlators of quantum fields in de Sitter space. It is based on nonequilibrium field theory techniques, and exploits de Sitter symmetries so as to partially reduce the number of independent variables of n-point functions in a manner that preserves the usefulness of a momentum representation, e.g., for writing spatial convolution integrals as simple products. In this representation, the two-point function of a scalar field only depends on two physical momenta, and the corresponding Schwinger-Dyson evolution equations take the form of momentum flow equations. Moreover, standard diagrammatic rules can be entirely formulated in this representation. The method is suitable for analytical approximations as well as numerical implementations. In forthcoming publications, we apply it to resum infrared logarithmic terms appearing in the perturbative calculation of vertex and correlation functions.
description: 16 pages, 9 figures; Published version (references added, typos corrected)
MojaveComm: A View-Oriented Group Communication Protocol with Support for Virtual Synchrony
Creators: name: Noblet, David Alexander
Publisher: name: California Institute of Technology
Year: 2008
Subjects: protocol
virtual synchrony
filesystem
consensus
distributed
group communication
consistency
MojaveComm
Computer Science

description: In this thesis, we explore the feasibility of implementing a general communication protocol that addresses common classes of problems that one encounters in the development of distributed applications, such as: multipoint-to-multipoint communication, message (re)ordering, mutual exclusion, and consensus. The paper details both the design and implementation of MojaveComm, a view-oriented total-order group communication protocol suitable for deployment on wide-area networks. Moreover, we provide a high-level overview of MojaveFS, a sequentially consistent distributed filesystem, and show how we can use the message-ordering guarantees of MojaveComm as the basis for the implementation of its sequential consistency guarantees.
Geologi Menyapa ke-17 Geofisika untuk eksplorasi migas
Creators: name: Sumintadireja
Publisher: name: Zenodo
Year: 2021
Subjects: geofisika
geophysics
oil and gas
exploration
geologi
geology
eksplorasi
minyak dan gas

description: Prodis1 Geologi is inviting you to a scheduled Zoom meeting. Topic: Geologi ITB Menyapa #17
 Dr. Prihadi S.: Penggunaan Metode Eksplorasi Geologi dan Geofisika di Industri Migas/Geotermal
 Time: Aug 7, 2021 01:00 PM Jakarta Join Zoom Meeting
 https://us06web.zoom.us/j/82555235642?pwd=bUpZQ1NtbmZjeTRGTzVsUkdHY1UrQT09 Meeting ID: 825 5523 5642
 Passcode: 287941
Nonlinear Three-Dimensional Trajectory Following: Simulation and Application
Creators: name: Hines, George Herbert
Publisher: name: California Institute of Technology
Year: 2008
Subjects: Aeronautics
flight control
Trajectory following
nonlinear control

description: In light of recent military requirements for unmanned and autonomous vehicles, research into methods of designing arbitrary three-dimensional trajectories and controlling aircraft along them has become vital. In this report, we explore two methods of nonlinear control for the purpose of following three-dimensional trajectories and paths. First, prior work on a dynamic feedback linearization exploiting the differential flatness of the ideal airplane is adapted with the intent of implementing it on a physical testbed in MIT’s Realtime indoor Autonomous Vehicle test ENvironment (RAVEN), but poor behavior—both in simulation and in hardware—under moderate levels of joint parameter uncertainty thwarted attempts at implementation. Additionally, the differential flatness technique in its pure form follows trajectories, which are sometimes inferior intuitively and practically to paths. In the context of unmanned air vehicle (UAV) flight in gusty environments, this motivated the extension of prior work on two-dimensional path following to three-dimensions, and simulations are presented in which the fully nonlinear controller derived from differential flatness follows a trajectory that is generated dynamically from a path. The three-dimensional path-following logic is actually implemented in RAVEN, and results are presented that demonstrate good vertical rise time in response to a step input and centimeter accuracy in vertical and lateral tracking. Future directions are proposed.
Receive Buffer Dynamics and OS Scheduling
Creators: name: White, Jerome S.
Publisher: name: California Institute of Technology
Year: 2008
Subjects: Computer Science
receive buffer
socket
operating system
TCP

description: We perform an empirical study of the effects receive-side resource sharing has on a TCP transaction. Our variable of focus is the buffer used to deliver packets to the application. Specifically, our interest lies with how its size affects throughput amidst background load.
title: Эквивалентные схемы волноводной линии с интенсивным электронным потоком
Creators: name: ., Б.К. Сивяков – д.т.н., профессор, кафедра «Электротехника и электроника», Саратовский государственный технический университет имени Гагарина Ю.А. E-mail: sibokon@rambler.ru Д.Б. Сивяков – к.т.н., доцент, кафедра «Электротехника и электроника», Саратовский государственный технический университет имени Гагарина Ю.А E-mail: sivyakovDB@gmail.com
Publisher: name: Издательство Радиотехника
Year: 2019

description: Постановка проблемы. Инженерные методы решения многих практически важных задач по расчетам сверхвысокочастотных приборов и устройств основаны на использовании эквивалентных схем, требующих перехода от рассмотрения полей к интегральным характеристикам: токам и напряжениям с применением более простого и наглядного математического аппарата теории электрических цепей и длинных линий.
Цель. Построить эквивалентные схемы волноводной электродинамической системы лампы бегущей волны с интенсивным электронным потоком для случая предварительного выделения наиболее интенсивного собственного потенциального электрического поля электронного потока на основе теории возбуждения волноводной системы интенсивным электронным потоком.
Результаты. Построены электродинамически обоснованные эквивалентные схемы волноводной линии для случаев стороннего и самосогласованного электронного потока, а также разработано эквивалентное представление всей лампы бегущей волны. Определены параметры эквивалентных схем.
Практическая значимость. Приведенные эквивалентные схемы представляют собой полные математические модели на макроуровне описания рассматриваемых объектов. Полнота макромоделей обеспечивается их полным соответствием полевым электродинамическим моделям микроуровня. Они могут быть использованы при решении задач проектирования ламп бегущей волны и других электровакуумных приборов сверхвысоких частот.
Introducing the "Fostering the uptake of RDA indicators in Systems Biomedicine as a measure for model quality and FAIRness within the COMBINE community" project
Creators: name: Irina, Balaur
name: Venkata, Satagopam
name: Dagmar, Waltemath
Publisher: name: Zenodo
Year: 2022
Subjects: COMBINE archive, FAIR, RDA indicators, EOSCFuture

description: Presentation of introducing the EOSCFuture-funded project on FAIR biosimulations at EOSC Symposium, Nov. 16, Prague.
title: Разработка усилительных схем в диапазонах C, X, Ku на усилительных широкополосных модулях УМШ тип I и тип II
Creators: name: ., А.С. Олейник – д.т.н., профессор, кафедра «Электронные приборы и системотехника», Саратовский государственный технический университет имени Гагарина Ю.А. E-mail: anatoly.semenovich@gmail.com А.А. Титков – начальник лаборатории, АО «НПП «Алмаз» (г. Саратов) E-mail: titkov-1973@yandex.ru Н.А. Пенькевич – инженер, ООО «НПП «Инжект» (г. Саратов) E-mail: nikitapenkevich@gmail.com
Publisher: name: Издательство Радиотехника
Year: 2019

description: Постановка проблемы. Построение твердотельных усилителей СВЧ на отечественной компонентной базе с выходной мощностью порядка 10 Вт в сверхширокой полосе частот на данном этапе развития радиоэлементной базы является сложной технической задачей при минимизации числа активных элементов. Использование активных элементов суммирования/деления сигнала в предусилительном и выходном каскадах накладывает дополнительные условия на коэффициент усиления активного элемента и коэффициент передачи делителя.
Цель. Разработать схему твердотельного усилителя для работы в оконечных каскадах радиопередающих систем, перекрывающих диапазоны частот C, X, Ku.
Результаты. Построена схема сверхширокополосного твердотельного усилителя СВЧ на основе модулей УМШ тип I и УМШ тип II производства АО «НПП Салют» (г. Нижний Новгород) с выходной мощностью более 10 Вт и трехкратным перекрытием по частоте. Применены идентичные усилительные элементы в выходном и предусилительном каскадах в трехканальной схеме суммирования/деления сигнала. Построена усилительная ячейка с выходной мощностью 2,4 Вт. Минимизировано число активных элементов при обеспечении практически полной загрузки предусилительных каскадов и достижении максимальной мощности выходных каскадов. Определены минимальное значение коэффициента усиления активного элемента и коэффициент передачи делителя при использовании в выходном и предусилительном каскадах одинаковых усилительных элементов.
Практическая значимость. Предложенная схема усиления сигнала на модулях УМШ тип I и УМШ тип II совместно с твердотельным полупроводниковым генератором может быть использована вместо ЛБВ в радиопередающих системах.
title: Волноводные противонаправленные ответвители
Creators: name: ., В.И. Тищенко – к.т.н., вед. науч. сотрудник, АО «НПЦ «Алмаз-Фазатрон» (г. Саратов) E-mail: STU1954@mail.ru А.Б. Данилов – начальник отдела, АО «НПП «Алмаз» (г. Саратов) E-mail: danilovab@almaz-rpe.ru
Publisher: name: Издательство Радиотехника
Year: 2019

description: Постановка проблемы. Среди волноводных многоэлементных направленных ответвителей со слабой связью конструкции противонаправленных ответвителей (ПНО) насчитывают единицы. Известны два варианта реализации ПНО при связи параллельных волноводов через отверстия в узкой стенке одного из волноводов, являющейся широкой стенкой другого волновода: вариант 1 – ответвитель Швингера с парой продольных щелей; вариант 2 – две группы щелей неодинаковых длин с наклоном 45° и 135° к продольной оси волноводов с расположением щелей на этой оси. В литературе параметры таких ответвителей представлены в узком диапазоне частот.
Цель. Рассмотреть возможность улучшения частотных характеристик волноводных ПНО со слабой связью для функционирования в полном диапазоне частот волновода, а именно: определить степени минимизации частотной зависимости переходного ослабления в конструкциях ПНО при приемлемых значениях направленности в рабочем диапазоне частот волновода, то есть для коэффициента перекрытия κ = 1,53.
Результаты. Проведены расчеты с помощью программы электромагнитного моделирования. Для варианта 1 предложено улучшить качество частотных характеристик за счет увеличения числа щелей, для варианта 2 – за счет их расположения. Получены результаты оптимизации для области связи 40 дБ с наклонными щелями в диапазоне частот волновода: отклонение среднего уровня переходного ослабления от номинала ±0,26 дБ; отклонение частотной характеристики переходного отклонения от среднего уровня ±0,12 дБ; минимальная направленность 28 дБ. Для области связи 40 дБ с продольными щелями эти характеристики соответственно следующие: ±0,1 дБ; ±0,54 дБ; 26 дБ.
Практическая значимость. Анализ полученных данных позволяет сделать вывод о целесообразности использования волноводных противонаправленных ответвителей с наклонными щелями и переходными ослаблениями 35 дБ и выше в трактах измерения проходящей мощности в полном диапазоне частот прямоугольного волновода.
title: Квазианалитическое определение электродинамических параметров коаксиально-секторного волновода
Creators: name: ., А.А. Скворцов – к.т.н., доцент, кафедра «Радиоэлектроника и телекоммуникации», Саратовский государственный технический университет им. Гагарина Ю.А. E-mail: sotrudniki.1@yandex.ru
Publisher: name: Издательство Радиотехника
Year: 2019

description: Постановка проблемы. Коаксиально-секторный волновод, обладающий рядом преимуществ по сравнению с линиями передачи простых поперечных сечений, в настоящее время находит все большее применение в качестве базовых элементов СВЧ-устройств для термообработки диэлектрических материалов, отражательных двумерно-периодических решеток и ряда других микроволновых систем. В связи с этим важной практической задачей, возникающей при проектировании СВЧ-устройств, выполненных на основе отрезков анализируемой линии передачи, является разработка квазианалитических выражений для оценки влияния геометрических размеров и электрофизических свойств диэлектрического заполнения коаксиально-секторного волновода на его электродинамических параметры.
Цель. Разработать методику квазианалитического расчета электродинамических параметров коаксиально-секторного волновода, основанную на его представлении в виде эквивалентного прямоугольного волновода, свернутого в поперечной плоскости по дуге окружности.
Результаты. Получены квазианалитические выражения для расчета электродинамических параметров коаксиально-секторного волновода, на основе которых исследованы зависимости критических длин основной и первой высшей волн, коэффициента широкополосности, волнового сопротивления, предельной передаваемой мощности и коэффициента затухания в металлических стенках рассматриваемой линии передачи при различных значениях ее геометрических размеров, электрофизических параметров однородного диэлектрического заполнения и рабочей длины волны. Для подтверждения правильности результатов квазианалитических расчетов проведено их сопоставление с данными, полученными метод конечных элементов, показавшее их достаточно хорошее согласование.
Практическая значимость. Полученные в настоящей работе квазианалитические выражения могут быть использованы при разработке СВЧ-устройств различного назначения, выполненных на основе коаксиально-секторного волновода.
title: Сравнение методов оценивания параметров квазигармонических сигналов
Creators: name: ., А.А. Львов – д.т.н., профессор, кафедра «Информационно-коммуникационные системы и программная инженерия», Саратовский государственный технический университет имени Гагарина Ю.А. E-mail: alvova@mail.ru А.А. Серанова – аспирант, кафедра «Информационно-коммуникационные системы и программная инженерия», Саратовский государственный технический университет имени Гагарина Ю.А. E-mail: seranova.anna@gmail.com Р.В. Ермаков – к.т.н., Саратовский государственный технический университет имени Гагарина Ю.А. E-mail: roma-ermakov@yandex.ru А.С. Мучкаев – к.т.н., Корпорация «Мартек» (Лас-Вегас, США) E-mail: marsand@mail.ru
Publisher: name: Издательство Радиотехника
Year: 2019

description: Постановка проблемы. Задача оценки параметров компонент многочастотного сигнала из конечного числа зашумленных дискретных измерений является в настоящее время активной областью исследований. Для ее решения на практике используется ряд методов, каждый из которых обладает своими достоинствами и недостатками. В частности, одним из наиболее популярных параметрических методов оценивания является метод, описанный в стандарте IEEE-STD-1057, представляющий собой алгоритмы для оценивания параметров волнового сигнала по его зашумленным дискретным временным отсчетам.
Цель. Предложить новый метод оценки компонент сигнала из конечного числа зашумленных дискретных измерений, основанный на субфакторизации матриц данных и с помощью имитационного моделирования провести его сравнение с методом, предлагаемым стандартом IEEE-STD-1057.
Результаты. Предложен алгоритм оценивания параметров квазигармонического сигнала, основанный на методе максимального правдоподобия, базирующемся на идее субфакторизации матрицы данных. Данный метод основан на итерационной процедуре решения получающихся нелинейных уравнений. В результате обработки экспериментальных данных двумя методами (новым методом максимального правдоподобия и методом, описанном в стандарте IEEE-STD-1057) получены оценки амплитудно-фазовой частотной характеристики (АФЧХ), а также погрешностей измерения. Показано, что предложенный метод показал высокую эффективность предлагаемого подхода и имеет преимущество перед методами, изложенными в стандарте IEEE-STD-1057, которое заметнее при низком уровне шума. Помимо указанного преимущества предлагаемый метод обладает также меньшей вычислительной сложностью за счет сокращения числа неизвестных, подлежащих оценке.
Практическая значимость. Полученные математические модели и алгоритмы оценки параметров компонент многочастотного сигнала из конечного числа зашумленных дискретных измерений могут быть использованы для разработки высокоскоростных и высокоточных специализированных устройств оценки параметров радиолокационных, акустических и электрических сигналов.
Central limit theorems for the shrinking target problem
Creators: name: Haydn, Nicolai
name: Nicol, Matthew
name: Vaienti, Sandro
name: Zhang, Licheng
Publisher: name: arXiv
Year: 2013
Subjects: subject: Dynamical Systems (math.DS)
subject: FOS: Mathematics
subject: 37A50, 37A25, 37D20

description: Suppose $B_i:= B(p,r_i)$ are nested balls of radius $r_i$ about a point $p$ in a dynamical system $(T,X,μ)$. The question of whether $T^i x\in B_i$ infinitely often (i. o.) for $μ$ a.e.\ $x$ is often called the shrinking target problem. In many dynamical settings it has been shown that if $E_n:=\sum_{i=1}^n μ(B_i)$ diverges then there is a quantitative rate of entry and $\lim_{n\to \infty} \frac{1}{E_n} \sum_{j=1}^{n} 1_{B_i} (T^i x) \to 1$ for $μ$ a.e. $x\in X$. This is a self-norming type of strong law of large numbers. We establish self-norming central limit theorems (CLT) of the form $\lim_{n\to \infty} \frac{1}{a_n} \sum_{i=1}^{n} [1_{B_i} (T^i x)-μ(B_i)] \to N(0,1)$ (in distribution) for a variety of hyperbolic and non-uniformly hyperbolic dynamical systems, the normalization constants are $a^2_n \sim E [\sum_{i=1}^n 1_{B_i} (T^i x)-μ(B_i)]^2$. Dynamical systems to which our results apply include smooth expanding maps of the interval, Rychlik type maps, Gibbs-Markov maps, rational maps and, in higher dimensions, piecewise expanding maps. For such central limit theorems the main difficulty is to prove that the non-stationary variance has a limit in probability.
Efficiency at maximum power of a chemical engine
Creators: name: Hooyberghs, Hans
name: Cleuren, Bart
name: Salazar, Alberto
name: Indekeu, Joseph O.
name: Broeck, Christian Van den
Publisher: name: arXiv
Year: 2013
Subjects: subject: Chemical Physics (physics.chem-ph)
subject: Statistical Mechanics (cond-mat.stat-mech)
subject: FOS: Physical sciences

description: A cyclically operating chemical engine is considered that converts chemical energy into mechanical work. The working fluid is a gas of finite-sized spherical particles interacting through elastic hard collisions. For a generic transport law for particle uptake and release, the efficiency at maximum power $η$ takes the form 1/2+cΔμ+ O(Δμ^2), with 1/2 a universal constant and $Δμ$ the chemical potential difference between the particle reservoirs. The linear coefficient c is zero for engines featuring a so-called left/right symmetry or particle fluxes that are antisymmetric in the applied chemical potential difference. Remarkably, the leading constant in $η$ is non-universal with respect to an exceptional modification of the transport law. For a nonlinear transport model we obtain η= 1/(θ+1), with θ>0 the power of $Δμ$ in the transport equation
Nutritional mitigation of deoxynivalenol-induced endocytosis and degradation of intestinal tight junction proteins
Creators: name: Li, Enkai
Publisher: name: Purdue University Graduate School
Year: 2022
Subjects: Biochemistry and cell biology not elsewhere classified

description: In sum, these studies described in this dissertation showed that both mycotoxin deoxynivalenol exposure and nutrient starvation can increase endocytosis and degradation of tight junction proteins in the lysosome. Therefore, manipulation of endocytic pathway as well as the signaling pathway involved in this process can be used to prevent intestinal barrier dysfunction in animals.
Prenolepis fulva , Mayr
Creators: name: Forel, A.
Publisher: name: L'Imprimerie Nationale
Year: 1891
Subjects: Biodiversity
Taxonomy
Animalia
Arthropoda
Insecta
Hymenoptera
Formicidae
Prenolepis
Prenolepis fulva

description: Prenolepis fulva, Mayr
(pl. III, fig. 3, 3a et 3b). - [[male]]. Valvules génitales d'un jaune brunâtre assez clair. Valvules extérieures plus étroites et plus longues que chez les P. obscura, P. Ellisii, etc., en triangle obtus, nullement échancrées à l'extrémité, sans dent, mais bien plus courtes et plus larges que chez la P. nitens. Valvules moyennes très semblables à celles des P. Ellisii et P. Humbloti; le prolongement interne est beaucoup plus long et plus large que l'externe. Mais ce dernier est assez fortement courbé et l'interne est plus étroit que chez les deux espèces citées, sans bord terminal distinct, avec une apparence de bec seulement et avec de petites verrues disposées comme chez la P. Ellisii. Valvules internes arrondies, sans denticulations (de Rio-de-Janeiro).
description: Published as part of Forel, A., 1891, Histoire naturelle des Hymenopteres. Deuxieme partie: Les Formicides., pp. 1-231 in Histoire Physique, Naturelle et Politique de Madagascar., Paris :L'Imprimerie Nationale on page 93, DOI: 10.5281/zenodo.9896
A maximum-entropy approach to the adiabatic freezing of a supercooled liquid
Creators: name: Prestipino, Santi
Publisher: name: arXiv
Year: 2013
Subjects: subject: Statistical Mechanics (cond-mat.stat-mech)
subject: Soft Condensed Matter (cond-mat.soft)
subject: FOS: Physical sciences

description: I employ the van der Waals theory of Baus and coworkers to analyze the fast, adiabatic decay of a supercooled liquid in a closed vessel with which the solidification process usually starts. By imposing a further constraint on either the system volume or pressure, I use the maximum-entropy method to quantify the fraction of liquid that is transformed into solid as a function of undercooling and of the amount of a foreign gas that could possibly be also present in the test tube. Upon looking at the implications of thermal and mechanical insulation for the energy cost of forming a solid droplet within the liquid, I identify one situation where the onset of solidification inevitably occurs near the wall in contact with the bath.
description: 16 pages, 7 figures