cometadata/datacite-rtg-text-other-reclassification-records huggingface dataset:
Calculation of enthalpy-entropy diagrams for rocket propellant systems
Creators: name: White, Richard S.
Publisher: name: California Institute of Technology
Year: 1949
Subjects: Aeronautics

description: It is the purpose of this thesis to calculate the data required to construct enthalpy-entropy diagrams for propellant systems and to investigate their usefulness when applied to the determination of rocket motor performance parameters.

Diagrams which cover a range of mixture ratios bracketing the stoichiometric value are included for the following systems:

(1) Liquid Ammonia and RFNA;
(2) Liquid Ammonia and Liquid Ozone;
(3) Liquid Hydrogen and Liquid Ozone.

Graphical performance parameter values obtained for the stoichiometric mixture of liquid ammonia and RFNA differed less than two tenths of one percent from the analytical values calculated by the Jet Propulsion Laboratory.

Performance values are determined for chamber pressures of 600 PSIA and 300 PSIA and for exhaust pressures of 14.7 PSIA, 7.65 PSIA, and .147 PSIA.

Because of the extensive calculations required to construct an h-s diagram, the graphical method of analysis is not economical unless a comprehensive study of a propellant is desired. However, if performance values are required over a wide range of boundary conditions, the h-s diagram permits the presentation of a large amount of data in a concise and readily useable form.
When Nonlocal Coupling Between Oscillators Becomes Stronger: Patched Synchrony or Multi-Chimera States
Creators: name: Omelchenko, Iryna
name: Omel'chenko, Oleh E.
name: Hövel, Philipp
name: Schöll, Eckehard
Publisher: name: arXiv
Year: 2012
Subjects: subject: Adaptation and Self-Organizing Systems (nlin.AO)
subject: Chaotic Dynamics (nlin.CD)
subject: FOS: Physical sciences

description: Systems of nonlocally coupled oscillators can exhibit complex spatio-temporal patterns, called chimera states, which consist of coexisting domains of spatially coherent (synchronized) and incoherent dynamics. We report on a novel form of these states, found in a widely used model of a limit-cycle oscillator if one goes beyond the limit of weak coupling typical for phase oscillators. Then patches of synchronized dynamics appear within the incoherent domain giving rise to a multi-chimera state. We find that, depending on the coupling strength and range, different multi-chimeras arise in a transition from classical chimera states. The additional spatial modulation is due to strong coupling interaction and thus cannot be observed in simple phase-oscillator models.
description: 6 pages, 5 figures, regular article
The geology of the Wiley Canyon area, Oak Ridge anticline, T 3-4 N, R 18-19 W, Ventura County, California
Creators: name: Rupnik, John Joseph
Publisher: name: California Institute of Technology
Year: 1941
Subjects: subject: Pico Formation
subject: Baker Fault
subject: Wiley Canyon
subject: Modelo Formation
subject: Oligocene Sespe
subject: Saugus Formation
subject: Vaqueros Formation
subject: Geology
subject: FOS: Earth and related environmental sciences
subject: Oak Ridge Fault

description: The accompanying map and thesis comprise a report on the geology of an area lying on the Oak Ridge anticline about six miles southeast of the town of Fillmore, California.

The Oligocene Sespe is the oldest formation exposed. The other formations found are Vaqueros, Modelo, Pico, Saugus, and finally, Recent terrace gravels and alluvium. The Sespe-Vaqueros and the Vaqueros-Modelo contacts appear to be conformable and are differentiated by a transition in lithology. A marked unconformity exists between the Modelo shale and Pico sandstone; this is not as pronounced on the west end as on the east end. The Saugus appears to overlap the Pico progressively from west to east.

The main structural features are the Oak Ridge fault, the Oak Ridge anticline, and the Eureka anticline and the Baker fault. Other subsidiary folds are present. The trend of the large structures is, on the whole, east and west; that of the lesser ones is mostly southeast and northwest.

The Oak Ridge fault is down-thrown on the north side; its plane is vertical at Torrey Canyon but is overturned at Wiley Canyon.

The Oak Ridge anticline consists of a series of small, connected domes. Oil production has been established on several of these domes. A new wildcat is now drilling on a small surface closure in Wiley Canyon.

The Eureka anticline plunges westward towards the Baker fault. The evidence found in the field indicates that this is an unusual structure. It forms a part of a large, recumbent fold which has been further folded into an asymmetrical anticline. It is terminated on the west end by what is here called the Baker fault (after the Baker Ranch). Competent beds are conglomerates and sandstones; fossil evidence indicates their age to be late Pico (probably San Diego. Model sandstones and shales make up the remainder of the exposed rocks.

The Baker fault runs southwest from the Santa Clare River through the first canyon west of Torrey Canyon. Two interpretations can be placed on the relationship of the rocks: the Baker fault may have originated with, and therefore can be terminated against, the Oak Ridge fault; or it may possible represent a different period of faulting, cutting the Oak Ridge fault and eventually joining up with the western end of the Santa Susana fault. Because of lack of sufficient evidence to the contrary, the first possibility is used.
Initial state geometry and the role of hydrodynamics in proton-proton, proton-nucleus and deuteron-nucleus collisions
Creators: name: Bzdak, Adam
name: Schenke, Bjoern
name: Tribedy, Prithwish
name: Venugopalan, Raju
Publisher: name: arXiv
Year: 2013
Subjects: subject: Nuclear Theory (nucl-th)
subject: High Energy Physics - Phenomenology (hep-ph)
subject: Nuclear Experiment (nucl-ex)
subject: FOS: Physical sciences

description: We apply the successful Monte Carlo Glauber and IP-Glasma initial state models of heavy ion collisions to the much smaller size systems produced in proton-proton, proton-nucleus and deuteron- nucleus collisions. We observe a significantly greater sensitivity of the initial state geometry to details of multi-particle production in these models compared to nucleus-nucleus collisions. In particular, we find that the size of the system produced in p+A collisions is very similar to the one produced in p+p collisions, and predict comparable Hanbury-Brown-Twiss radii in the absence of flow in both systems. Differences in the eccentricities computed in the models are large, while differences amongst the generated flow coefficients v_2 and v_3 are smaller. For a large number of participants in proton-lead collisions, the v_2 generated in the IP-Glasma model is comparable to the value obtained in proton-proton collisions. Viscous corrections to flow are large over characteristic lifetimes in the smaller size systems. In contrast, viscous contributions are significantly diminished over the longer space-time evolution of a heavy ion collision.
description: 11 pages, 14 figures, figure 4 replaced, comments added, typos corrected
Bedeutung der Gelegenheits- und Opportunitätsstrukturen für die Bildungsintegration von jungen Geflüchteten
Creators: name: Hamelmann, Alisa
Publisher: name: Universität Osnabrück
Year: 2023
Subjects: subject: Berufsbildungsforschung
subject: Migration
subject: Bildung
subject: 370 - Bildung und Erziehung
subject: 80.04 - Ausbildung, Beruf, Organisationen
subject: 80.36 - Erziehung und Gesellschaft

description: Kongruent zur stetig steigenden Fluchtmigration gewinnt die integrative Funktion von Bildung und Arbeit kontinuierlich an Relevanz. Die berufliche Einmündung Geflüchteter ist insofern ein hochaktuelles Thema der Berufsbildungsforschung, das jedoch besonders hinsichtlich subjektorientierter Zugänge noch große Lücken aufweist. Zur Erforschung der Opportunitäts- und Gelegenheitsstrukturen junger Geflüchteter, der sich diese Masterarbeit widmet, erweist sich eben jener Zugang als sehr ergiebig. Während sich unter Jugendlichen deutscher Nationalität eine zunehmende Gelassenheit bei der Berufswahl abzeichnet, ist bei jungen Geflüchteten der Kontrastfall festzustellen. Als Kernursache macht die Arbeit die stark begrenzten Entscheidungs- und Handlungsmöglichkeiten junger Geflüchteter aus, die diese durch eine eindrückliche Offensivität und Beharrlichkeit ausgleichen. Acht Einzelfälle junger Menschen mit Fluchthintergrund, die mittels der Grounded Theory Method (nach Glaser und Strauss) ausgewertet wurden, verdeutlichen, dass in diesem Modus die für die Ausbildungsintegration wichtigsten Kontakte geknüpft werden. Zusätzlich verdichtet wird die Erkenntnis durch die Feststellung, dass es sich zumeist um ehrenamtlich Unterstützende handelt, die die entscheidenden Weichen für eine erfolgreiche Ausbildungsaufnahme der Geflüchteten stellen. Neben den Implikationen für die Zugewanderten selbst deckt die Forschung auch weitreichende Auswirkungen für Staat und Wirtschaft auf, die die Benachteiligung und Hierarchisierung von Geflüchteten nach sich ziehen. Diese Einsichten werden im Schlussteil der Arbeit in erste Empfehlungen sowie anknüpfende Forschungsbedarfe überführt.
McCATMuS - Transcription model for handwritten, printed and typewritten documents from the 16th century to the 21st century
Creators: name: Chagué, Alix
Publisher: name: Zenodo
Year: 2024
Subjects: kraken_pytorch
HTR
OCR
generic model

description: Built upon datasets from institutions and projects committed to Open Science, McCATMuS provides an interoperable dataset encompassing over 180 manuscripts in 7 different languages (French, Latin, Spanish, English, German, Italian and Occitan). It includes more than 118,000 lines of text and nearly 4 million characters, covering a period from the early 16th century to the present day.

All the datasets were automatically or, when precised, manually corrected to correspond to the CATMuS transcription guidelines, available here: https://catmus-guidelines.github.io/

The annotations in the dataset result for layout extraction, line extraction, typing and transcription, from the original creators of the dataset in most cases, or from automatic or manual corrections by the curator of the CATMuS modern dataset. The alignment of the dataset with CATMuS' guidelines was performed by the curator of the dataset.

The curated dataset can be accessed via HuggingFace: https://huggingface.co/datasets/CATMuS/modern

This model was trained on the McCATMuS Dataset, with Kraken v.4.3.13, with NFD Unicode normalization and a batch size of 32 over 157 epochs.
Identification of slow molecular order parameters for Markov model construction
Creators: name: Perez-Hernandez, Guillermo
name: Paul, Fabian
name: Giorgino, Toni
name: de Fabritiis, Gianni
name: Noé, Frank
Publisher: name: arXiv
Year: 2013
Subjects: subject: Chemical Physics (physics.chem-ph)
subject: Biomolecules (q-bio.BM)
subject: FOS: Physical sciences
subject: FOS: Biological sciences

description: A goal in the kinetic characterization of a macromolecular system is the description of its slow relaxation processes, involving (i) identification of the structural changes involved in these processes, and (ii) estimation of the rates or timescales at which these slow processes occur. Most of the approaches to this task, including Markov models, Master-equation models, and kinetic network models, start by discretizing the high-dimensional state space and then characterize relaxation processes in terms of the eigenvectors and eigenvalues of a discrete transition matrix. The practical success of such an approach depends very much on the ability to finely discretize the slow order parameters. How can this task be achieved in a high-dimensional configuration space without relying on subjective guesses of the slow order parameters? In this paper, we use the variational principle of conformation dynamics to derive an optimal way of identifying the "slow subspace" of a large set of prior order parameters - either generic internal coordinates (distances and dihedral angles), or a user-defined set of parameters. It is shown that a method to identify this slow subspace exists in statistics: the time-lagged independent component analysis (TICA). Furthermore, optimal indicators-order parameters indicating the progress of the slow transitions and thus may serve as reaction coordinates-are readily identified. We demonstrate that the slow subspace is well suited to construct accurate kinetic models of two sets of molecular dynamics simulations, the 6-residue fluorescent peptide MR121-GSGSW and the 30-residue natively disordered peptide KID. The identified optimal indicators reveal the structural changes associated with the slow processes of the molecular system under analysis.
Linear accelerators
Creators: name: Vretenar, Maurizio
Publisher: name: arXiv
Year: 2013
Subjects: subject: Accelerator Physics (physics.acc-ph)
subject: FOS: Physical sciences

description: Radio-frequency linear accelerators are used as injectors for synchrotrons and as stand-alone accelerators for the production of intense particle beams, thanks to their ability to accelerate high beam currents at high repetition rates. This lecture introduces their main features, reviewing the different types of accelerating structures used in linacs and presenting the main characteristics of linac beam dynamics. Building on these bases, the architecture of modern proton linear accelerators is presented with a particular emphasis on high-energy and high-beam-power applications.
description: 25 pages, contribution to the CAS - CERN Accelerator School: Course on High Power Hadron Machines; 24 May - 2 Jun 2011, Bilbao, Spain
Edward Lewis and Radioactive Fallout: The Impact of Caltech Biologists on the Debate Over Nuclear Weapons Testing in the 1950s and 60s
Creators: name: Caron, Jennifer
Publisher: name: California Institute of Technology
Year: 2003
Subjects: atomic bomb
Beadle
Pauling
Caltech
genetics
Edward Lewis
History and Philosophy of Science
Sturtevant
World War II
Brown
Hydrogen bomb
Nobel

description: The work of Caltech biologists, particularly, Edward Lewis, on leukemia and ionizing radiation transformed the public debate over nuclear weapons testing.  The United States began testing hydrogen bombs in 1952, sending radioactive fallout around the globe.  Earlier more localized fallout was generated starting in 1945 from tests of atomic weapons at Nevada test sites.  The Atomic Energy Commission claimed the tests would not harm human health.  Geneticists knew from animal and plant experiments that radiation can cause both illness and gene mutations.  They spoke out to warn the policymakers and the public. Edward Lewis used data from four independent populations exposed to radiation to demonstrate that the incidence of leukemia was linearly related to the accumulated dose of radiation. He argued that this implied that leukemia resulted from a somatic gene mutation.  Since there was no evidence for the existence of a threshold for the induction of gene mutations down to doses as low as 25 r, there was unlikely to be a threshold for the induction of leukemia. This was the first serious challenge to the concept that there would be a threshold for the induction of cancer by ionizing radiation.  Outspoken scientists, including Linus Pauling, used Lewis's risk estimate to inform the public about the danger of nuclear fallout by estimating the number of leukemia deaths that would be caused by the test detonations.  In May of 1957 Lewis's analysis of the radiation-induced human leukemia data was published as a lead article in Science magazine.  In June he presented it before the Joint Committee on Atomic Energy of the US Congress
Prevalence of prediabetes and type 2 diabetes mellitus in south and southeast Asian women with history of gestational diabetes mellitus: systematic review and metaanalysis
Creators: name: Chockalingam, Shivashri
name: Saravanan, Ponnusamy
Publisher: name: Open Science Framework
Year: 2022
Subjects: subject: Medicine and Health Sciences

description: Women living in SA and SEA countries with GDM have high rates of prediabetes and T2DM on postpartum follow-up. Despite the lack of adequate data, which requires carefully designed longitudinal studies, these findings highlight the importance of prioritising women with past history of GDM for T2DM prevention strategies. Development of precision medicine would be key for individualised strategies, which is likely to have better adherence rates for both screening and prevention.
PSO based Neural Networks vs. Traditional Statistical Models for Seasonal Time Series Forecasting
Creators: name: Adhikari, Ratnadip
name: Agrawal, R. K.
name: Kant, Laxmi
Publisher: name: arXiv
Year: 2013
Subjects: subject: Neural and Evolutionary Computing (cs.NE)
subject: FOS: Computer and information sciences
subject: 68T05

description: Seasonality is a distinctive characteristic which is often observed in many practical time series. Artificial Neural Networks (ANNs) are a class of promising models for efficiently recognizing and forecasting seasonal patterns. In this paper, the Particle Swarm Optimization (PSO) approach is used to enhance the forecasting strengths of feedforward ANN (FANN) as well as Elman ANN (EANN) models for seasonal data. Three widely popular versions of the basic PSO algorithm, viz. Trelea-I, Trelea-II and Clerc-Type1 are considered here. The empirical analysis is conducted on three real-world seasonal time series. Results clearly show that each version of the PSO algorithm achieves notably better forecasting accuracies than the standard Backpropagation (BP) training method for both FANN and EANN models. The neural network forecasting results are also compared with those from the three traditional statistical models, viz. Seasonal Autoregressive Integrated Moving Average (SARIMA), Holt-Winters (HW) and Support Vector Machine (SVM). The comparison demonstrates that both PSO and BP based neural networks outperform SARIMA, HW and SVM models for all three time series datasets. The forecasting performances of ANNs are further improved through combining the outputs from the three PSO based models.
description: 4 figures, 4 tables, 31 references, conference proceedings
ARDUINO PLATFORMASI BILAN FLEX SENSOR INTERFEYSI
Creators: name: Ochilov, M.R.
name: Ochilova, S.R.
name: Usmonov, Maxsud
name: Akhmatova, Durdona
Publisher: name: Zenodo
Year: 2024

description: Biz moslashuvchan sensor va uning Arduino bilan interfeysi haqida bilib olamiz. Shuningdek, biz moslashuvchan sensor qanday ishlashini va uning ilovalarini bilib olamiz.
Specific instrumentation and diagnostics for high-intensity hadron beams
Creators: name: Wittenburg, Kay
Publisher: name: arXiv
Year: 2013
Subjects: subject: Accelerator Physics (physics.acc-ph)
subject: FOS: Physical sciences

description: An overview of various typical instruments used for high-intensity hadron beams is given. In addition, a few important diagnostic methods are discussed which are quite special for these kinds of beams.
description: 58 pages, contribution to the CAS - CERN Accelerator School: Course on High Power Hadron Machines; 24 May - 2 Jun 2011, Bilbao, Spain
Scalar Field Theories On The World Sheet: Cutoff Independent Treatment
Creators: name: Bardakci, Korkut
Publisher: name: arXiv
Year: 2013
Subjects: subject: High Energy Physics - Theory (hep-th)
subject: FOS: Physical sciences

description: Following earlier work on the same topic, we consider once more scalar field theories on the world sheet parametrized by the light cone coordinates. For most of the way, we use the same approach as in the previous work, but there is an important new development. To avoid the light cone singularity at p^{+}=0, one world sheet coordinate had to be discretized, introducing a cutoff into the model.In the earlier work, this cutoff could not be removed, making the model unreliable. In the present article, we show that, by a careful choice of the mass counter term, both the infrared singularity at p^{+}=0 and the ultraviolet mass divergences can be simultaneously eliminated. We therefore finally have a cutoff independent model on a continuously parametrized world sheet. We study this model in the mean field approximation, and as before, we find solitonic solutions. Quantizing the solitonic collective coordinates gives rise to a string like model. However, in contrast to the standard string model, the trajectories here are not in general linear but curved.
description: 27 pages, 4 figures, typos corrected and minor revisions made
Conserved sandpile with a variable height restriction
Creators: name: de Carvalho, Vanuildo Silva
name: Caparica, Alvaro de Almeida
name: Dickman, Ronald
Publisher: name: arXiv
Year: 2012
Subjects: subject: Statistical Mechanics (cond-mat.stat-mech)
subject: FOS: Physical sciences

description: We study a restricted-height version of the one-dimensional Oslo sandpile with conserved density, using periodic boundary conditions. Each site has a limiting height which can be either two or three. When a site reaches its limiting height it becomes active and may topple, loosing two particles, which move randomly to nearest-neighbor sites. After a site topples it is randomly assigned a new limiting height. We study the model using mean-field theory and Monte Carlo simulation, focusing on the quasi-stationary state, in which the number of active sites fluctuates about a stationary value. Using finite-size scaling analysis, we determine the critical particle density and associated critical exponents.
description: 13 pages, 6 figures The paper will appear in Volume 43 of the Brazilian Journal of Physics
Obstructions To Classically Simulating The Quantum Adiabatic Algorithm
Creators: name: Hastings, M. B.
name: Freedman, M. H.
Publisher: name: arXiv
Year: 2013
Subjects: subject: Quantum Physics (quant-ph)
subject: FOS: Physical sciences

description: We consider the adiabatic quantum algorithm for systems with "no sign problem", such as the transverse field Ising mode, and analyze the equilibration time for quantum Monte Carlo (QMC) on these systems. We ask: if the spectral gap is only inverse polynomially small, will equilibration methods based on slowly changing the Hamiltonian parameters in the QMC simulation succeed in a polynomial time? We show that this is not true, by constructing counter-examples. Some examples are Hamiltonians where the space of configurations where the wavefunction has non-negligible amplitude has a nontrivial fundamental group, causing the space of trajectories in imaginary time to break into disconnected components, with only negligible probability outside these components. For the simplest example we give with an abelian fundamental group, QMC does not equilibrate but still solves the optimization problem. More severe effects leading to failure to solve the optimization can occur when the fundamental group is a free group on two generators. Other examples where QMC fails have a trivial fundamental group, but still use ideas from topology relating group presentations to simplicial complexes. We define gadgets to realize these Hamiltonians as the effective low-energy dynamics of a transverse field Ising model. We present some analytic results on equilibration times which may be of some independent interest in the theory of equilibration of Markov chains. Conversely, we show that a small spectral gap implies slow equilibration at low temperature for some initial conditions and for a natural choice of local QMC updates.
description: 18 pages plus appendix. Note on latex compilation: this should compile with pdflatex or with latex followed by dvipdfm, but compiling with latex followed by dvips may cause the figures in the appendix to render incorrectly; v2: added references
Minimum drag due to lift for a delta wing with sonic leading edges
Creators: name: Strand, Torstein
Publisher: name: California Institute of Technology
Year: 1954
Subjects: Aeronautics

description: Using linearized theory a close approximation to the optimum camber and twist distribution of a Delta wing of zero thickness with sonic leading edges has been obtained.

The optimum wing has a camber line that is negative over the front quarter of the total planform area and is positive over the remaining area. A certain amount of washout is exhibited.

Compared to the flat plate a saving in induced drag of slightly over 7 percent is shown. The leading edges are relieved of a considerable portion of the total lift. It is shown that this lift has been re-distributed over the central part of the wing.
Differential Evolution for Many-Particle Adaptive Quantum Metrology
Creators: name: Lovett, Neil B.
name: Crosnier, Cécile
name: Perarnau-Llobet, Martí
name: Sanders, Barry C.
Publisher: name: arXiv
Year: 2013
Subjects: subject: Quantum Physics (quant-ph)
subject: FOS: Physical sciences

description: We devise powerful algorithms based on differential evolution for adaptive many-particle quantum metrology. Our new approach delivers adaptive quantum metrology policies for feedback control that are orders-of-magnitude more efficient and surpass the few-dozen-particle limitation arising in methods based on particle-swarm optimization. We apply our method to the binary-decision-tree model for quantum-enhanced phase estimation as well as to a new problem: a decision tree for adaptive estimation of the unknown bias of a quantum coin in a quantum walk and show how this latter case can be realized experimentally.
description: Fig. 2(a) is the cover of Physical Review Letters Vol. 110 Issue 22
Rank-1 Saddle Transport in Three or More Degrees of Freedom Scattering Reactions
Creators: name: Brunton, Steven Lee
Publisher: name: California Institute of Technology
Year: 2006
Subjects: subject: Monte Carlo methods
subject: Mathematics
subject: FOS: Mathematics
subject: geometric mechanics
subject: transition state theory
subject: Rank-1 saddle
subject: invariant manifold transport

description: A computationally effective method is developed to study rank-1 saddle transport. In particular, the lifetime distribution is calculated for the planar, nonzero angular momentum scattering reaction of H2 with H2O. The scattering model uses the approximate potential of Wiesenfeld et al.[14], which has 3 essential degrees of freedom (DOF) and a rotating transition state (TS) at physically relevant energies. A Monte Carlo sampling of the energy surface on a transverse cut near the TS provides a representative set of trajectories which are integrated forward and backward to test for reactivity. Reactive trajectories are then integrated forward into the bound state until they escape the reaction, resulting in orbit/collision data for each trajectory. This data is collected and binned until the standard deviation of the data in each bin is within a user defined tolerance, yielding a lifetime distribution with bounded error terms. To test this method, it is applied to the well studied phenomena of electron scattering in the Rydberg atom with crossed fields[1,4] and compared with the literature.
Isotopically modified Ge detectors for {\sc Gerda}: from production to operation
Creators: name: Budjáš, D.
name: Agostini, M.
name: Baudis, L.
name: Bellotti, E.
name: Bezrukov, L.
name: Brugnera, R.
name: Cattadori, C.
name: di Vacri, A.
name: Falkenstein, R.
name: Garfagnini, A.
name: Georgi, S.
name: Grabmayr, P.
name: Hegai, A.
name: Hemmer, S.
name: Hult, M.
name: Csáthy, J. Janicskó
name: Kornoukhov, V.
name: Lehnert, B.
name: Lubashevskiy, A.
name: Nisi, S.
name: Pivato, G.
name: Schönert, S.
name: Tarka, M.
name: von Sturm, K.
Publisher: name: arXiv
Year: 2013
Subjects: subject: Instrumentation and Detectors (physics.ins-det)
subject: Nuclear Experiment (nucl-ex)
subject: FOS: Physical sciences

description: The \textsc{Gerda} experiment searches for the neutrinoless double beta ($0νβ$beta$) decay of $^{76}$Ge using high-purity germanium detectors made of material enriched in $^{76}$Ge. For Phase II of the experiment a sensitivity for the half life $T_{1/2}^{0ν}\,\,\sim2\cdot10^{26}$ yr is envisioned. Modified Broad Energy Germanium detectors (BEGe) with thick n$^+$ electrodes provide the capability to efficiently identify and reject background events, while keeping a large acceptance for the $0νβ$beta$-decay signal through novel pulse-shape discrimination (PSD) techniques. The viability of producing thick-window BEGe-type detectors for the \textsc{Gerda} experiment is demonstrated by testing all the production steps from the procurement of isotopically modified germanium up to working BEGe detectors. Comprehensive testing of the spectroscopic as well as PSD performance of the \textsc{Gerda} Phase II prototype BEGe detectors proved that the properties of these detectors are identical to those produced previously from natural germanium material following the standard production line of the manufacturer. Furthermore, the production of BEGe detectors from a limited amount of isotopically modified germanium served to optimize the production, in order to maximize the overall detector mass yield. The results of this test campaign provided direct input for the subsequent production of the enriched germanium detectors.
description: (16 pages, 5 figures)
ประวัติศาสตร์ชุมชนกับการท่องเที่ยว:กรณีศึกษา ชุมชนสามเรือน ตำบลสามเรือน อำเภอบางปะอิน จังหวัดพระนครศรีอยุธยา
Creators: name: เอกพล  วิงวอน
Publisher: name: คณะมนุษยศาสตร์และสังคมศาสตร์ มหาวิทยาลัยราชภัฏพระนครศรีอยุธยา
Year: 2022
Subjects: ประวัติศาสตร์ชุมชน
การท่องเที่ยวด้านประวัติศาสตร์วัฒนธรรม
การมีส่วนร่วมของชุมชน

description: วารสารวิชาการมนุษยศาสตร์และสังคมศาสตร์ มหาวิทยาลัยราชภัฏพระนครศรีอยุธยา, 10, 2, 69-92
Structure and enumeration of (3+1)-free posets (extended abstract)
Creators: name: Guay-Paquet, Mathieu
name: Morales, Alejandro H.
name: Rowland, Eric
Publisher: name: arXiv
Year: 2012
Subjects: subject: Combinatorics (math.CO)
subject: FOS: Mathematics
subject: 05A15

description: A poset is (3+1)-free if it does not contain the disjoint union of chains of length 3 and 1 as an induced subposet. These posets are the subject of the (3+1)-free conjecture of Stanley and Stembridge. Recently, Lewis and Zhang have enumerated \emph{graded} (3+1)-free posets, but until now the general enumeration problem has remained open. We enumerate all (3+1)-free posets by giving a decomposition into bipartite graphs, and obtain generating functions for (3+1)-free posets with labelled or unlabelled vertices.
description: 12 pages, 5 figures
Hydrogen chloride in diffuse interstellar clouds along the line of sight to W31C (G10.6-0.4)
Creators: name: Monje, R. R.
name: Lis, D. C.
name: Roueff, E.
name: Gerin, M.
name: De Luca, M.
name: Neufeld, D. A.
name: Godard, B.
name: Phillips, T. G.
Publisher: name: arXiv
Year: 2013
Subjects: subject: Astrophysics of Galaxies (astro-ph.GA)
subject: FOS: Physical sciences

description: We report the detection of hydrogen chloride, HCl, in diffuse molecular clouds on the line of sight towards the star-forming region W31C (G10.6-0.4). The J = 1-0 lines of the two stable HCl isotopologues, H35Cl and H37Cl, are observed using the 1b receiver of the Heterodyne Instrument for the Far-Infrared (HIFI) aboard the Herschel Space Observatory. The HCl line is detected in absorption, over a wide range of velocities associated with diffuse clouds along the line of sight to W31C. The analysis of the absorption strength yields a total HCl column density of few 10^13 cm^-2, implying that HCl accounts for ~0.6 % of the total gasphase chlorine, which exceeds by a factor of ~6 the theoretical model predictions. This result is comparable to those obtained from the chemically-related species H2Cl+ and HCl+, for which large column densities have also been reported on the same line of sight. The source of discrepancy between models and observations is still unknown; however, the detection of these Cl-bearing molecules, provides key constraints for the chlorine chemistry in the diffuse gas.
The effect of Reynolds number on the flow field about A 70 degress cone
Creators: name: Bevernick, R. A.
Publisher: name: California Institute of Technology
Year: 1949
Subjects: Aeronautics

description: This investigation has undertaken to measure the possible Reynolds number effects in the flow field about a 70° finite cone in a supersonic flow.  The principal means of observing such effects was by static pressure measurements at the surface of the cone.

Results indicate that such effects do exist when the free stream Mach number is low enough to produce subsonic flow over the face of the cone, but they are slight.  At very low Reynolds numbers with a detached shock, some decrease in static pressure on the surface of the cone results, apparently due to increased boundary layer.  Over the entire range of Reynolds numbers investigated with either attached or detached shock, an increase in static pressure on the cone face at some distance from the apex results from increased Reynolds number, apparently due to the shoulder disturbance.

The investigation was conducted at GALCIT as the basis for a thesis in partial fulfillment for the professional degree of Aeronautical Engineer.
«Τηλεπικοινωνίες και τηλεπισκόπηση στην Έρευνα και Διάσωση»
Creators: name: Georgiou, Harris
Publisher: name: Zenodo
Year: 2023
Subjects: Search and Rescue
ICT
Artificial Intelligence
AI

description: «Τηλεπικοινωνίες και τηλεπισκόπηση στην Έρευνα και Διάσωση»
 Περιεχόμενα: Βασικές έννοιες στις επιχειρήσεις Έρευνας και Διάσωσης / ιδιαιτερότητες επιχειρήσεων στο αστικό περιβάλλον / συνήθη προβλήματα και τρόποι αντιμετώπισης / ο ρόλος των τηλεπικοινωνιών και της τηλεπισκόπησης / μελέτη περίπτωσης (1): πλημμύρες στη Μάνδρα Αττικής (2017) / μελέτη περίπτωσης (2): πυρκαγιά στο Μάτι Αττικής (2018) / μελέτη περίπτωσης (3): σεισμός στην Τουρκία (2023) / προτάσεις και επόμενα βήματα.
 Επίπεδο γνώσεων (από): Οποιοδήποτε
 Προαπαιτούμενα: Κανένα
Toussaintia Boutique, Bull. Jard. Bot. Etat Bruxelles 21: 97 1951
Creators: name: Couvreur, Thomas L. P.
name: Dagallier, Leo-Paul M. J.
name: Crozier, Francoise
name: Ghogue, Jean-Paul
name: Hoekstra, Paul H.
name: Kamdem, Narcisse G.
name: Johnson, David M.
name: Murray, Nancy A.
name: Sonke, Bonaventure
Publisher: name: Zenodo
Year: 2022
Subjects: Biodiversity
Taxonomy
Plantae
Tracheophyta
Magnoliopsida
Magnoliales
Annonaceae
Toussaintia

description: Toussaintia Boutique, Bull. Jard. Bot. État Bruxelles 21: 97, 1951 Type species. Tousaintia congolensis Boutique. Description. Same as species. A small genus of four species (Luke and Deroin 2005) distributed in central and east Africa, one species occurs in Cameroon, not endemic. Toussaintia is a genus of lianas or scandent shrubs, characterized by the presence of an androgynophore (elongated receptacle on which the stamens and carpels are inserted). All species are rare across their range. Taxonomy. There is no revision available for this genus yet, but Luke and Deroin (2005) provide a key to all four species.
description: Published as part of Couvreur, Thomas L. P., Dagallier, Leo-Paul M. J., Crozier, Francoise, Ghogue, Jean-Paul, Hoekstra, Paul H., Kamdem, Narcisse G., Johnson, David M., Murray, Nancy A. & Sonke, Bonaventure, 2022, Flora of Cameroon - Annonaceae Vol 45, pp. 1-532 in PhytoKeys 207 on page 325, DOI: 10.3897/phytokeys.207.61432
description: {"references": ["Luke, Q, Deroin, T, 2005. A new Toussaintia (Annonaceae) from Tanzania. Journal of East African Natural History 94: 165-174. https://doi.org/10.2982/0012-8317(2005)94[165:ANTAFT]2.0.CO;2"]}
The study of a lifting air breathing boost for satellite launch
Creators: name: Smith, Homer Leroy
Publisher: name: California Institute of Technology
Year: 1959
Subjects: Aeronautics

description: The effect on performance of variations in power plant, aircraft, and rocket parameters was calculated for a lifting air breathing boost system for launching satellites. A limited variation in aircraft flight plan was considered also. In addition, comparisons were made between the air breathing boost system and a three stage all rocket system. For the air breathing boost computations were made for launch Mach numbers ranging from two to five.

The air breathing boost was assumed to be a turbojet or dual cycle engine powered aircraft. The rocket used in conjunction with the boost had two stages. In computing aircraft performance thrust and engine specific fuel consumption were taken as constants. The lift to drag ratio was also considered constant for each portion of the flight profile which consisted of a take off and acceleration to climb speed, a two step climb, and a pull up to the maximum angle attainable for rocket launch.

In computing rocket performance burning times, effective exhaust velocities, payload weight ratios, and structural weight ratios were assumed to be the same for each stage. Drag was neglected in rocket calculations, and the acceleration of gravity was assumed constant. The calculations were made by computing the kinetic and potential energies for a sounding rocket and equating them to the energy required for orbit.
SOMOS LA COLOMBIA INSOSTENIBLE
Creators: name: Suárez, Luis Andrés Díaz
Publisher: name: Zenodo
Year: 2021
Subjects: Desarrollo, sostenible, Ecología, Covid, Inclusión

description: Se demostrará que Colombia a la fecha actual, es un país insostenible en todas sus dimensiones respecto a los objetivos plateados para el 2030. La pobreza, el hambre, los sistemas deficientes de salud, la educación, recursos insuficientes como el agua, desempleo, guerra. Parecen características muy comunes en nuestro País. Irónicamente los antónimos a esas tipologías son las metas que se plantean los demás países para poder reconocer la existencia de desarrollo sostenible en su región. Primero abordaremos el tema actual de la pandemia, Analizaremos la teoría del desarrollo sostenible y sus diferentes conceptos. Luego se profundizará el estado de los ODS en Colombia, se presentarán las diferentes soluciones y por último se evaluará el protagonismo de la Universidad y la pedagogía en la sostenibilidad.Se demostrará que Colombia a la fecha actual, es un país insostenible en todas sus dimensiones respecto a los objetivos plateados para el 2030. La pobreza, el hambre, los sistemas deficientes de salud, la educación, recursos insuficientes como el agua, desempleo, guerra. Parecen características muy comunes en nuestro País. Irónicamente los antónimos a esas tipologías son las metas que se plantean los demás países para poder reconocer la existencia de desarrollo sostenible en su región. Primero abordaremos el tema actual de la pandemia, Analizaremos la teoría del desarrollo sostenible y sus diferentes conceptos. Luego se profundizará el estado de los ODS en Colombia, se presentarán las diferentes soluciones y por último se evaluará el protagonismo de la Universidad y la pedagogía en la sostenibilidad.
Repeated loads above the proportional limit on 24st aluminum alloy
Creators: name: Rao, Chintakindi V. Joga.
Publisher: name: California Institute of Technology
Year: 1948
Subjects: Aeronautics

description: The purpose of this investigation is to study the effects of repeated tensile stresses above the proportional limit on 24ST Aluminum Alloy.

The investigation consisted of three parts:

1. An investigation of the effects of the application of repeated tensile stress above the proportional limit for 500 cycles followed by a higher repeated tensile stress up to 5,000 cycles.

2. An investigation of the effects of changing the number of cycles of pre-stress.

3. An Investigation of the effects of aging.

It was found that permanent deformation caused by over-stress is not a useful factor in forecasting life expectancy.

It was also found that the effects of aging, initial cold work, and magnitude of overstresses applied all have definite influence on the ability of 24ST Aluminum Alloy to withstand further overstressing and require considerably more thorough investigation.

It is considered that this field offers attractive possibilities for further study of the behavior of aircraft materials with the objective of increased accuracy in airplane design.

The investigation was carried out in collaboration with Conrad N. Nelson, Captain, U. S. Air Force at the Daniel Guggenheim Aeronautical Laboratory, California Institute of Technology, Pasadena, California.
Physics of the Interplay Between the Top Quark and the Higgs Boson
Creators: name: Chala, Mikael
name: Santiago, Jose
Publisher: name: arXiv
Year: 2013
Subjects: subject: High Energy Physics - Phenomenology (hep-ph)
subject: FOS: Physical sciences

description: We discuss some aspects of the interplay between the top quark and the Higgs boson at the LHC. First we describe what indirect information on the top Yukawa coupling can be extracted from measurements in the Higgs sector. We then show that the study of processes involving $Ht\bar{t}$ and $Hb\bar{b}$ final states can give us information on the spectrum in models of strong electroweak symmetry breaking. In particular, we introduce a novel analysis of the $Hb\bar{b}\to bb\bar{b}\bar{b}$ channel with an excellent discovery potential at the LHC.
description: 5 pages, 6 figures, Proceedings of TOP 2012, added references
Holographic droplets in p-wave insulator/superconductor transition
Creators: name: Roychowdhury, Dibakar
Publisher: name: arXiv
Year: 2013
Subjects: subject: High Energy Physics - Theory (hep-th)
subject: Superconductivity (cond-mat.supr-con)
subject: General Relativity and Quantum Cosmology (gr-qc)
subject: FOS: Physical sciences

description: In the present paper, based on the notion of marginally stable modes of vector perturbations in the AdS soliton back ground we investigate the magnetic field effect on holographic $ p $- wave insulator/superconductor transition in the probe limit. We perform explicit analytic calculations considering both Schwarzschild AdS soliton and Gauss Bonnet AdS soliton back grounds and obtain a unique relation between the chemical potential and the magnetic field near the critical point. We also extend our analysis for $ p+ip $- wave back ground in the presence of external magnetic field. In both the cases it is observed that the non abelian model exhibit \textit{droplet} solutions. Moreover it is also found that the increase in the value of the external magnetic field essentially reduces the size of the droplet and thereby makes the condensation harder.
description: Published In JHEP
Experimental investigation of oilfilm behaviour in short journal bearings
Creators: name: Auksmann, Boris
Publisher: name: California Institute of Technology
Year: 1959
Subjects: subject: Mechanical Engineering
subject: FOS: Mechanical engineering

description: This report contains the description of the test apparatus that was designed and built for experimental investigation of oilfilm behaviour in short full-journal bearings of circumferential feed groove type. An account of the engineering problems solved in connection with the design and development of the apparatus is also given.

Complete pressure distributions were obtained for a two inch diameter, one inch long bearing operating at 3500 rpm under 30 and 60 lb. applied loads and with various axial pressure gradients and supply pressures. The results are presented in graphical form and a comparison is made with the short bearing theory developed by F. W. Ocvirk. Agreement with theory was found to be very good when operating with low axial pressure gradient and high supply pressure (cavitation completely suppressed), while with high axial pressure gradient substantial differences in pressure distribution were found.

Visual observations of oilfilm behaviour were made with a transparent plastic bearing of the same proportions, operating with a 60 lb. load at 3500 rpm. Cavitation behaviour under various axial pressure gradients and supply pressures is discussed, and photographic records of typical cavitation behaviour are presented in the report.

Eccentricity and attitude angle measurements were made in all tests and experimental results are presented with pressure distribution data and cavitation behaviour records.
On the probability of habitable planets
Creators: name: Forget, Francois
Publisher: name: arXiv
Year: 2012
Subjects: subject: Earth and Planetary Astrophysics (astro-ph.EP)
subject: FOS: Physical sciences

description: In the past 15 years, astronomers have revealed that a significant fraction of the stars should harbor planets and that it is likely that terrestrial planets are abundant in our galaxy. Among these planets, how many are habitable, i.e. suitable for life and its evolution? These questions have been discussed for years and we are slowly making progress. Liquid water remains the key criterion for habitability. It can exist in the interior of a variety of planetary bodies, but it is usually assumed that liquid water at the surface interacting with rocks and light is necessary for the emergence of a life able to modify its environment and evolve. A first key issue is thus to understand the climatic conditions allowing surface liquid water assuming a suitable atmosphere. This have been studied with global mean 1D models which has defined the "classical habitable zone", the range of orbital distances within which worlds can maintain liquid water on their surfaces (Kasting et al. 1993). A new generation of 3D climate models based on universal equations and tested on bodies in the solar system is now available to explore with accuracy climate regimes that could locally allow liquid water. A second key issue is now to better understand the processes which control the composition and the evolution of the atmospheres of exoplanets, and in particular the geophysical feedbacks that seems to be necessary to maintain a continuously habitable climate. From that point of view, it is not impossible that the Earth's case may be special and uncommon.
description: Published in the "International Journal of Astrobiology", for the special issue "Drake Equation Symposium"
Intrinsic spin-relaxation induced negative tunnel magnetoresistance in a single-molecule magnet
Creators: name: Xie, Haiqing
name: Wang, Qiang
name: Xue, Hai-Bin
name: Jiao, HuJun
name: Liang, J. -Q.
Publisher: name: arXiv
Year: 2013
Subjects: subject: Mesoscale and Nanoscale Physics (cond-mat.mes-hall)
subject: FOS: Physical sciences

description: We investigate theoretically the effects of intrinsic spin-relaxation on the spin-dependent transport through a single-molecule magnet (SMM), which is weakly coupled to ferromagnetic leads. The tunnel magnetoresistance (TMR) is obtained by means of the rate-equation approach including not only the sequential but also the cotunneling processes. It is shown that the TMR is strongly suppressed by the fast spin-relaxation in the sequential region and can vary from a large positive to slight negative value in the cotunneling region. Moreover, with an external magnetic field along the easy-axis of SMM, a large negative TMR is found when the relaxation strength increases. Finally, in the high bias voltage limit the TMR for the negative bias is slightly larger than its characteristic value of the sequential region, however it can become negative for the positive bias caused by the fast spin-relaxation.
description: 7 pages, 5 figures
Riemann's Theorie der algebraischen Funktionen, Vorlesung von Adolf Hurwitz.
Notizen, ausgearbeitet von Adolf Hurwitz
Creators: name: Hurwitz, Adolf
Publisher: name: [s.n.]
Year: 1893

description: Notizen zur Vorlesung, vorgetragen im Sommersemester 1893 am Eidgenössischen Polytechnikum.
Text mit Figuren.
Abschliessend 1 Bl. leer
Integralgleichungen, Seminar von Adolf Hurwitz.
Notizen, ausgearbeitet von Adolf Hurwitz
Creators: name: Hurwitz, Adolf
Publisher: name: [s.n.]
Year: 1912

description: Notizen zum Seminar, abgehalten Wintersemester 1912/13 an der ETH Zürich.
Text mit Figuren.
Abschliessend 3 Bl. leer.
Hs 582:92-95 wurden von Adolf Hurwitz in einem Briefumschlag mit dem Titel "Mathematisches Seminar" zusammengefasst
Theorie der algebraischen Funktionen, Vorlesung von Adolf Hurwitz.
Vorlesungsnachschrift, ausgearbeitet von Julius Hurwitz
Creators: name: Hurwitz, Julius
Publisher: name: [s.n.]
Year: 1893

description: Nachschrift der Vorlesung, vorgetragen im Sommersemester 1893 am Eidgenössischen Polytechnikum.
Text mit Figuren.
Das zweitletzte Bl. beinhaltet das Inhaltsverzeichnis, zuvor 51 Bl. leer
Abschliessend 1 Bl. leer.
Beilage: Entwurf der Nachschrift. Neu zusätzlich Gesamtpaginierung erstellt