cometadata/datacite-rtg-text-other-reclassification-records huggingface dataset:
Random Aharonov-Bohm vortices and some exact families of integrals: Part II
Creators: name: Mashkevich, Stefan
name: Ouvry, Stéphane
Publisher: name: arXiv
Year: 2008
Subjects: subject: Mesoscale and Nanoscale Physics (cond-mat.mes-hall)
subject: Statistical Mechanics (cond-mat.stat-mech)
subject: High Energy Physics - Theory (hep-th)
subject: FOS: Physical sciences

description: At 6th order in perturbation theory, the random magnetic impurity problem at second order in impurity density narrows down to the evaluation of a single Feynman diagram with maximal impurity line crossing. This diagram can be rewritten as a sum of ordinary integrals and nested double integrals of products of the modified Bessel functions $K_ν$ and $I_ν$, with $ν=0,1$. That sum, in turn, is shown to be a linear combination with rational coefficients of $(2^5-1)ζ(5)$, $\int_0^{\infty} u K_0(u)^6 du$ and $\int_0^{\infty} u^3 K_0(u)^6 du$. Unlike what happens at lower orders, these two integrals are not linear combinations with rational coefficients of Euler sums, even though they appear in combination with $ζ(5)$. On the other hand, any integral $\int_0^{\infty} u^{n+1} K_0(u)^p (uK_1(u))^q du$ with weight $p+q=6$ and an even $n$ is shown to be a linear combination with rational coefficients of the above two integrals and 1, a result that can be easily generalized to any weight $p+q=k$. A matrix recurrence relation in $n$ is built for such integrals. The initial conditions are such that the asymptotic behavior is determined by the smallest eigenvalue of the transition matrix.
description: 9 pages, LaTeX 2e. A few sentences rephrased more exactly, misprints corrected
Viehweger, Klaus, Weltmissions-Konferenz Bangkok
Creators: name: Müller-Römheld, Walter
Publisher: name: Ökumenische Rundschau
Year: 2025

description: Ökumenische Rundschau, Bd. 23 Nr. 1 (1974): Ökumenische Rundschau, Band 23, Heft 1
Generating High-Resolution climate data using SinGAN
Creators: name: Paper, Paper
Publisher: name: figshare
Year: 2021
Subjects: Climate Science

description: Original GPM data can download from https://disc.gsfc.nasa.gov/datasets/GPM_3IMERGDF_06/summary?keywords="IMERG final"
original SinGAN: https://github.com/tamarott/SinGAN
SCFusion: Real-time Incremental Scene Reconstruction with Semantic Completion
Creators: name: Wu, Shun-Cheng
name: Tateno, Keisuke
name: Navab, Nassir
name: Tombari, Federico
Publisher: name: arXiv
Year: 2020
Subjects: subject: Computer Vision and Pattern Recognition (cs.CV)
subject: Neural and Evolutionary Computing (cs.NE)
subject: Robotics (cs.RO)
subject: FOS: Computer and information sciences

description: Real-time scene reconstruction from depth data inevitably suffers from occlusion, thus leading to incomplete 3D models. Partial reconstructions, in turn, limit the performance of algorithms that leverage them for applications in the context of, e.g., augmented reality, robotic navigation, and 3D mapping. Most methods address this issue by predicting the missing geometry as an offline optimization, thus being incompatible with real-time applications. We propose a framework that ameliorates this issue by performing scene reconstruction and semantic scene completion jointly in an incremental and real-time manner, based on an input sequence of depth maps. Our framework relies on a novel neural architecture designed to process occupancy maps and leverages voxel states to accurately and efficiently fuse semantic completion with the 3D global model. We evaluate the proposed approach quantitatively and qualitatively, demonstrating that our method can obtain accurate 3D semantic scene completion in real-time.
Bouncing Universes in String-inspired Gravity
Creators: name: Biswas, Tirthabir
name: Mazumdar, Anupam
name: Siegel, Warren
Publisher: name: arXiv
Year: 2005
Subjects: subject: High Energy Physics - Theory (hep-th)
subject: Astrophysics (astro-ph)
subject: General Relativity and Quantum Cosmology (gr-qc)
subject: FOS: Physical sciences

description: We consider the effects on cosmology of higher-derivative modifications of (effective) gravity that make it asymptotically free without introducing ghosts. The weakening of gravity at short distances allows pressure to prevent the singularity, producing a solution with contraction preceding expansion.
description: 28 pages, 2 figures; v2: added references
Detection of Objects Below Uneven Surfaces With a UAV-Based GPSAR
Creators: name: Grathwohl, Alexander
name: Arendt, Bernd
name: Grebner, Timo
name: Waldschmidt, Christian
Publisher: name: Universität Ulm
Year: 2023
Subjects: subject: Bodenradar
subject: Unebene Oberfläche
subject: DDC 620 / Engineering & allied operations
subject: Ground penetrating radar
subject: Continuous wave radar
subject: Synthetic apertures
subject: Radar
subject: Dauerstrichradar
subject: Drohne (Flugkörper)
subject: Synthetische Apertur

description: Airborne ground-penetrating synthetic aperture radar (GPSAR) using unmanned aerial vehicles (UAVs) offers advantages for many applications compared to established methods. In particular, these systems are useful for non-traversable terrain, where they could be used for the detection and localization of buried objects and structures. At distances of a few meters to the ground, refraction effects at the surface need to be considered in processing even for shallowly buried objects. Often the ground is assumed to be horizontal, which is not the case in many situations, such as uneven meadows or acres. This work investigates the influence of uneven ground on GPSAR images. It is shown that neglecting tilt in backprojection for shallowly buried targets leads to an apparent target shift. A model is derived to predict the shift for circular measurement trajectories and to estimate, if quality loss is to be expected. The model is verified using simulations, which are verified by measurement. It is concluded that tilt can be neglected in processing for shallowly buried targets. This is confirmed in a realistic measurement scenario.
Efficiency and Technological Change at U.S. Research Universities
Creators: name: Kim, Kwansoo
name: Foltz, Jeremy D.
name: Barham, Bradford L.
name: Chavas, Jean-Paul
name: Kim, Kwansoo
name: Foltz, Jeremy D.
name: Barham, Bradford L.
name: Chavas, Jean-Paul
Publisher: name: Unknown
Year: 2005
Subjects: Teaching/Communication/Extension/Profession

description: This paper investigates the determinants of efficiency and technological progress at US research universities. It relies on a unique panel data set of multiple outputs and inputs from 92 universities covering the period 1981-1998. Over that time span, US universities experienced large increases in industry funding and in academic patenting activity. In this context, the directional distance function and a nonparametric representation of the underlying production technology are combined to obtain estimates of productivity growth and technical efficiency. A pooled-Tobit estimator is used to examine the determinants of technical efficiency and the rate of technological progress. The results show how changes in funding sources for U.S. research universities affects research performance.
Study of Pluto's Atmosphere Based on 2020 Stellar Occultation Light Curve Results
Creators: name: Poro, Atila
name: Farahani, Farzaneh Ahangarani
name: Bahraminasr, Majid
name: Hadizadeh, Maryam
name: kodini, Fatemeh Najafi
name: Rezaee, Maryam
name: Gargari, Mahsa Seifi
Publisher: name: arXiv
Year: 2020
Subjects: subject: Earth and Planetary Astrophysics (astro-ph.EP)
subject: FOS: Physical sciences

description: On 6 Jun 2020, Pluto's stellar occultation was successfully observed at a ground-based observatory and Pluto's atmospheric parameters were investigated. We used an atmospheric model of Pluto (DO15), assuming a spherical and transparent pure N2 atmosphere. Using ray-tracing code the stellar occultation light curve was satisfactorily fitted to this model. We found that Pluto's atmospheric pressure at the reference radius of 1215 km is 6.72+_0.21 μbar. Our estimated pressure shows a continuation of the increasing pressure studied in 2016 consistent with a seasonal volatile transport model. We concluded that the N2 condensation processes in the Sputnik Planitia glacier are increasing due to the heating of the N2 ice in this basin. This study's result was shown on the diagram of the annual evolution of atmospheric pressure.
description: 4 figures, 2 tables
Colloidal doped-quantum dots for sensing and photocatalysis: from chemical design to advanced physicochemical features
Creators: name: Vitiello, Giuseppe
Publisher: name: Zenodo
Year: 2024

description: Colloidal quantum dots (QDs), also known as colloidal nanocrystals (NCs), are among the most frequently reported nanomaterials in the recent years both from the fundamental point of view and for their exploitation as emerging materials for varieties of applications, from bio- and chemo-sensing to photocatalysis and optoelectronic.

Conventional QDs are nanoparticles of a semiconducting material with diameters in the range of few nanometers, in which the quantum confinement effects originate, thus leading to a widening of the band gap. Therefore, the emission color of QDs can be tuned by controlling their size, chemical composition and surface properties. By selecting proper core material with a desired band gap and tuning the size, the emission wavelength of QDs can cover the ultraviolet (UV), visible, and near-infrared (NIR) regions. At the same time, atomic doping and surface functionalization with specific functional chemical groups represent useful strategies to improve the optical and red-ox properties of such colloidal nanoparticles, favoring their application in many technological fields.

Among the large variety of colloidal QDs, confined nanoparticles of metal oxides (MeOX) and carbon material, also known as carbon-dots (CDs), are considered as very promising nano-systems to be used for (bio)sensing and photocatalysis due to their low toxicity and favorable optical and red-ox properties. In this contest, our interest is actually focused on the design and preparation of both MeOX-QDs (i.e., ZnO and CeO2) and CDs deriving from the treatment of agrifood biowastes through a bottom-up wet-chemistry approach by starting from the molecular precursors treated under mild conditions. This approach guarantee a fine tuning of the chemical composition, morphology and size of the designed QDs. The role of the atomic doping with heteroatoms, such as fluorine and sulfur, was studied for ZnO-QDs and CDs, respectively, while the coating of CeO2-QDs with amphiphilic molecules was proposed as a strategy to favor the hierarchical organization of nanocrystals into ordered superlattice improving their optical features.

For this aim, the outstanding combination of microscopy and spectroscopic analyses, carried out within the NFFA project, results decisive to shed light on the physicochemical features of such modified-QDs, thus allowing to define the chemistry-structure-function relationship as a decisive step for the development of functional nanomaterials for advanced technological applications.
SPATIAL EQUILIBRIUM WITH INTERMEDIATE PRODUCTS: IMPLEMENTATION AND VALIDATION IN THE MERCOSUR
Creators: name: Waquil, Paulo Dabdab
name: Cox, Thomas L.
name: Waquil, Paulo Dabdab
name: Cox, Thomas L.
Publisher: name: Unknown
Year: 1995
Subjects: Research Methods/ Statistical Methods

description: This paper develops the formulation of a spatial equilibrium model with intermediate products. The presence of intermediate products brings a better representation of the real world, accounting for the technological relationships among commodities in the several stages of production. Instead of the usual assumption of constant costs of transformation, positively sloped cost of transformation functions are assumed, reflecting increasing marginal costs of transformation. The model is implemented and validated in the analysis of the optimal allocation and pricing of animal products, grains and oilseeds in the MERCOSUR.
Sense in Sociability? Social Exclusion and Persistent Poverty in South Africa
Creators: name: Adato, Michelle
name: Carter, Michael R.
name: May, Julian
name: Adato, Michelle
name: Carter, Michael R.
name: May, Julian
Publisher: name: Unknown
Year: 2004
Subjects: Food Security and Poverty

description: Social capital has been identified as an important avenue of upward mobility for poorer people. However, recent theoretical work suggests that in highly polarized societies, the accumulation of social capital is likely to be fragmented and ineffective for people at the bottom of the economic pyramid. In South Africa, apartheid-era policies created such deep, socially embedded inequality producing a self-reinforcing circle of social exclusion and persistent poverty as another of apartheid's legacies. Work to date on post-apartheid income distribution-with its demonstration of increasing inequality and poverty-is consistent with this legacy hypothesis. This paper takes this hypothesis further by using a two-pronged approach that draws on quantitative and qualitative data to explore the role of different types of assets in explaining poverty status. First, novel econometric analysis of poverty and livelihood dynamics is used to test for a poverty trap that would signal the existence of a ceiling to upward mobility for poor people. The analysis finds evidence of such a trap. Secondly, the qualitative data is used to confirm and more deeply probe the reasons behind the patterns of truncated upward mobility, finding accessibility and stability of employment and state pensions as key factors explaining why people remain poor or non-poor. While this analysis finds ample evidence of active social capital and networks, these are more helpful for non-poor households while for the poor they seem to at best help stabilize livelihood at low levels and seem to do little to promote upward mobility. This paper's confirmation of the legacy hypothesis suggests the publicly provided social safety nets that exist in South Africa need to be at least maintained if not strengthened, while state policy needs to take a more aggressive role in assuring that households have access to a minimum bundle of assets and to the markets needed to effectively build on those assets over time.
900 Jahre Prämonstratenserorden - 900 éves a premontrei rend
Creators: name: Balogh, Péter Piusz
name: Hancz, Gábor Tamás
name: Holnapy, Dénes Márton
name: Kovács, Ágnes
name: Kusler, Ágnes
name: Orbán, Csaba Frigyes
Publisher: name: Universität Regensburg
Year: 2020
Subjects: subject: Katholische Kirche; Prämonstratenser; Ordensgeschichte; Klöster; Hagiographie
subject: 230 Theologie, Christentum

description: Der 900 Jahre alte Prämonstratenserorden ist seit dem 12. Jahrhundert in Ungarn präsent. Der Orden wurde im Jahr 1120 von Norbert von Xanten mit dreizehn Gefährten in Prémontré bei Laon, auf dem Fernbesitz der Abtei Prüm, gegründet. 2020 feiern sie ihr 900-jähriges Bestehen, und zu diesem Anlass hat die Ungarische Zirkarie (Visitations- und Verwaltungsbezirk) eine hochrangige internationale wissenschaftliche Konferenz organisiert. 

Die Konferenz gab einen Überblick über die Spiritualität, Gründung, Vergangenheit und Gegenwart des Ordens in Ungarn. Sie präsentiert das materielle Erbe der Prämonstratenser in Ungarn und den Beitrag der Ordensmitglieder zur ungarischen Kultur.
Predicting the Post-Impact Velocity of a Robotic Arm via Rigid Multibody Models: an Experimental Study
Creators: name: Aouaj, Ilias
name: Padois, Vincent
name: Saccon, Alessandro
Publisher: name: arXiv
Year: 2020
Subjects: subject: Robotics (cs.RO)
subject: FOS: Computer and information sciences

description: Accurate post-impact velocity predictions are essential in developing impact-aware manipulation strategies for robots, where contacts are intentionally established at non-zero speed mimicking human manipulation abilities in dynamic grasping and pushing of objects. Starting from the recorded dynamic response of a 7DOF torque-controlled robot that intentionally impacts a rigid surface, we investigate the possibility and accuracy of predicting the post-impact robot velocity from the pre-impact velocity and impact configuration. The velocity prediction is obtained by means of an impact map, derived using the framework of nonsmooth mechanics, that makes use of the known rigid-body robot model and the assumption of a frictionless inelastic impact.The main contribution is proposing a methodology that allows for a meaningful quantitative comparison between the recorded post-impact data, that exhibits a damped oscillatory response after the impact, and the post-impact velocity prediction derived via the readily available rigid-body robot model, that presents no oscillations and that is the one typically obtained via mainstream robot simulator software. The results of this new approach are promising in terms of prediction accuracy and thus relevant for the growing field of impact-aware robot control. The recorded impact data (18 experiments) is made publicly available, together with the numerical routines employed to generate the quantitative comparison, to further stimulate interest/research in this field.
Oosterwal, Gottfried, Modern Messianic Movements as a Theological and Missionary Challenge
Creators: name: Gensichen, Hans-Werner
Publisher: name: Ökumenische Rundschau
Year: 2025

description: Ökumenische Rundschau, Bd. 23 Nr. 1 (1974): Ökumenische Rundschau, Band 23, Heft 1
The Discovery of the Optical and Near-IR Afterglows of the First Swift Gamma-Ray Bursts
Creators: name: Berger, E.
name: Fox, D. B.
name: Kulkarni, S. R.
name: Krzeminski, W.
name: Soderberg, A. M.
name: Frail, D. A.
name: Burrows, D. N.
name: Cenko, S. B.
name: Murphy, E. J.
name: Price, P. A.
name: Gal-Yam, A.
name: Moon, D. -S.
name: Gehrels, N.
name: Freedman, W. L.
name: Persson, S. E.
name: Barthelmy, S.
name: Hill, J. E.
name: Nousek, J. A.
name: Moretti, A.
Publisher: name: arXiv
Year: 2005
Subjects: subject: Astrophysics (astro-ph)
subject: FOS: Physical sciences

description: We present optical and near-infrared searches for afterglow emission from the first four Swift bursts with accurate positions from the X-ray Telescope (XRT). Using telescopes at Las Campanas, Keck, and Palomar observatories we rapidly identified and followed up afterglows for three of the four bursts. The burst positions were also observed with the Very Large Array, but no radio afterglow emission was detected. The optical/NIR afterglows are fainter than about 75% of all afterglows detected to date, with GRB 050126 being the faintest, and were identified thanks to accurate and rapid positions from the XRT and rapid response with >1-m telescopes. This suggests that the fraction of dust-obscured bursts is small, <10% when combined with afterglows localized by the HETE-2 Soft X-ray Camera. The X-ray fluxes are typical of the known population, with the exception of GRB 050126 which has the faintest X-ray afterglow to date (normalized to t=10 hr), and was detected thanks to a response time of only 130 s after the burst. Finally, we find that all three optical/NIR afterglows are located <2 arcsec away from the nominal XRT positions, suggesting that the XRT is capable of delivering highly accurate positions, which will revolutionize afterglow studies.
description: Submitted to ApJ; 13 pages, 6 figures, 2 tables
Surface Clutter Analysis for Detectability Prediction of Buried Objects with a UAV-Based GPSAR
Creators: name: Kanz, Julian
name: Grathwohl, Alexander
name: Waldschmidt, Christian
Publisher: name: Universität Ulm
Year: 2023
Subjects: subject: UAV
subject: Multicopter
subject: Surface scattering model
subject: DDC 620 / Engineering & allied operations
subject: Synthetic aperture radar
subject: Ground penetrating radar
subject: Synthetische Apertur
subject: Quadrocopter

description: Airborne ground penetrating synthetic aperture radars (GPSAR) for the detection of buried objects such as landmines have been proposed recently. For systems with a side-looking geometry, surface and subsurface returns are superimposed and influence each other. An analysis of the statistics of surface clutter in the radar image thus enables a prediction of the detectability of objects below the surface. GPSAR measurements of areas with different texture are performed and evaluated. It is shown, that subsurface imaging is possible under various surfaces, but strong surface clutter limits the detectability of buried objects.
Z' and the Appelquist-Carrazzone decoupling
Creators: name: Chankowski, P. H.
name: Pokorski, S.
name: Wagner, J.
Publisher: name: arXiv
Year: 2006
Subjects: subject: High Energy Physics - Phenomenology (hep-ph)
subject: FOS: Physical sciences

description: We consider the electroweak theory with an additional neutral vector boson $Z^\prime$ at one loop. We propose a renormalization scheme which makes the decoupling of heavy $Z^\prime$ effects manifest. The proposed scheme justifies the usual procedure of performing fits to the electroweak data by combining the full SM loop corrections to observables with the tree level corrections due to the extended gauge structure. Using this scheme we discuss in the model with extra an $U(1)^\prime$ group factor 1-loop results for the $ρ$ parameters defined in several different ways.
description: 36 pages, no postscript figures
Teacher Perceptions of the Causes and Effects of Attrition
Creators: name: Hanson, Diana
Publisher: name: Maryland Shared Open Access Repository
Year: 2013
Subjects: subject: Education -- Research papers (Graduate)

description: The purpose of this study was to examine causes of the phenomenon of teacher attrition and its
impact on schools. Evaluating perceptions of why teachers leave the profession as well as
understanding the impact of teacher attrition may help school systems better retain high-quality
teachers. Based upon a review of literature about the impact of attrition on schools, the
researcher developed a survey for teachers to rate the degree to which they felt factors included
in nine survey items contributed to attrition and the degree to which they felt factors included in
seven survey items were impacted by attrition. Descriptive analyses of teacher perceptions
related to attrition were computed and comparisons of results obtained through analyses of
variance were made to determine if the mean ratings were statistically equivalent across the
survey items reflecting first the reasons for and then the impact of attrition. Results indicated
that the survey items were not perceived as equally important in terms of contributing to or the
degree to which they are impacted by attrition. A major finding of the study is that one of the
major reasons teachers leave the profession is their perception of receiving inadequate pay for
the job. However, salary limitations are not the only cause for teacher attrition. Heavy
workloads and lack of support from parents and administrators also were rated as contributors to
attrition. More research to determine how teachers’ perceptions can best inform policy to reduce
teacher attrition is warranted.
IS INDUSTRIAL HEMP WORTH FURTHER STUDY IN THE US? A SURVEY OF THE LITERATURE
Creators: name: Fortenbery, T. Randall
name: Bennett, Michael
name: Fortenbery, T. Randall
name: Bennett, Michael
Publisher: name: Unknown
Year: 2001
Subjects: Crop Production/Industries

description: There has been considerable interest recently in alternative cropping opportunities for US grain producers. One crop that has received significant interest has been industrial hemp. Hemp production has essentially been non-existent in the US since the 1950's. The purpose of this paper is to summarize the current state of knowledge relative to opportunities for domestic commercial hemp production.
DIMENSIONS AND DIVERSITY OF PROPERTY RIGHTS IN RURAL CHINA: DILEMMAS ON THE ROAD TO FURTHER REFORM
Creators: name: Liu, Shouying
name: Carter, Michael R.
name: Yao, Yang
name: Liu, Shouying
name: Carter, Michael R.
name: Yao, Yang
Publisher: name: Unknown
Year: 1996
Subjects: Land Economics/Use

description: This paper contributes to the debate over land in rural China by conceptualizing and measuring multiple dimensions of property rights in a way which elucidates the competing interests which are affected by the property rights regime. Utilizing a unique village level data set on property rights, this paper argues that the regional and temporal variation in rural property rights signals a pattern in which decentralized institutional innovation occurs in response to the competing interests of the national state, of local authorities, and of present and possible future individual land users. Unlike the earlier debate concerning the household responsibility system, the current property rights dilemma is intrinsically more complex because the potential conflicts of interest between individuals, local collectives and the state are greater. Resolution of that debate will ultimately require careful exploration of the reality and substance of the tradeoffs and competing interests which make further reform of rural property rights so difficult.
title: Unilateral ICA agenesis with contralateral venous malformation: A rare case
Creators: name: Bhatia, Pratibha
Publisher: name: EURORAD
Year: 2024
Subjects: subject: Head & neck imaging
subject: Head and neck
subject: Neuroradiology brain
subject: Vascular
subject: CT-Angiography
subject: MR
subject: Ultrasound-Power Doppler
subject: Clinical Case

description: Clinical History: A 16-year-old adolescent girl presented with complaints of left cheek swelling for the past 2 years, increasing in size in the dependent position. On clinical examination, a soft tissue bulge was seen on the left side of the face, which was compressible and soft on palpation. No overlying skin discolouration was seen.

description: 16 years, female
Interpretable Clustering on Dynamic Graphs with Recurrent Graph Neural Networks
Creators: name: Yao, Yuhang
name: Joe-Wong, Carlee
Publisher: name: arXiv
Year: 2020
Subjects: subject: Machine Learning (cs.LG)
subject: Social and Information Networks (cs.SI)
subject: FOS: Computer and information sciences

description: We study the problem of clustering nodes in a dynamic graph, where the connections between nodes and nodes' cluster memberships may change over time, e.g., due to community migration. We first propose a dynamic stochastic block model that captures these changes, and a simple decay-based clustering algorithm that clusters nodes based on weighted connections between them, where the weight decreases at a fixed rate over time. This decay rate can then be interpreted as signifying the importance of including historical connection information in the clustering. However, the optimal decay rate may differ for clusters with different rates of turnover. We characterize the optimal decay rate for each cluster and propose a clustering method that achieves almost exact recovery of the true clusters. We then demonstrate the efficacy of our clustering algorithm with optimized decay rates on simulated graph data. Recurrent neural networks (RNNs), a popular algorithm for sequence learning, use a similar decay-based method, and we use this insight to propose two new RNN-GCN (graph convolutional network) architectures for semi-supervised graph clustering. We finally demonstrate that the proposed architectures perform well on real data compared to state-of-the-art graph clustering algorithms.
description: AAAI 2021
Improving SAR Imaging by Superpixel-Based Compressed Sensing and Backprojection Processing
Creators: name: Bonfert, Christina
name: Ruopp, Elias
name: Waldschmidt, Christian
Publisher: name: Universität Ulm
Year: 2024
Subjects: subject: SAR
subject: Compressed Sensing
subject: UAV
subject: DDC 620 / Engineering & allied operations
subject: Synthetic aperture radar
subject: Signal processing
subject: Radar
subject: Synthetische apertur
subject: Komprimierte Abtastung

description: Radars mounted on unmanned aerial vehicles (UAVs) enable high flexibility in data acquisition since arbitrary and especially nonlinear flight trajectories can be achieved. Compared to linear flight trajectories, nonlinear trajectories achieve better image quality and allow the scene and targets to be observed from different angles, thereby capturing angle-dependent features. However, the inversion of synthetic aperture radar (SAR) data for nonlinear apertures and sample acquisition is computationally taxing and artifacts may arise in the image due to the aperture’s structure. To suppress aperture artifacts and clutter in the SAR image, a backprojection imaging algorithm combined with compressed sensing (CS) methods is proposed. In this work, an efficient way to calculate the backprojection in a CS framework is described that does not require interpolation steps. Since SAR images are neither strictly sparse nor noise-dominated, an adapted CS algorithm is proposed that accounts for clutter and extended targets that are spread across multiple image pixels. In addition, an image segmentation approach is presented that enables faster processing while being robust to extended targets located at segment edges. With the proposed approach, SAR images of arbitrary flight paths can be processed efficiently with fewer acquisition points while achieving better clutter suppression at the same image quality compared to equally dense measurement sets.
Demonstration of a non-Abelian geometric controlled-Not gate in a superconducting circuit
Creators: name: Xu, Kai
name: Ning, Wen
name: Huang, Xin-Jie
name: Han, Pei-Rong
name: Li, Hekang
name: Yang, Zhen-Biao
name: Zheng, Dongning
name: Fan, Heng
name: Zheng, Shi-Biao
Publisher: name: arXiv
Year: 2020
Subjects: subject: Quantum Physics (quant-ph)
subject: FOS: Physical sciences

description: Holonomies, arising from non-Abelian geometric transformations of quantum states in Hilbert space, offer a promising way for quantum computation. These holonomies are not commutable and thus can be used for the realization of a universal set of quantum logic gates, where the global geometric feature may result in some noise-resilient advantages. Here we report the first on-chip realization of a non-Abelian geometric controlled-Not gate in a superconducting circuit, which is a building block for constructing a holonomic quantum computer. The conditional dynamics is achieved in an all-to-all connected architecture involving multiple frequency-tunable superconducting qubits controllably coupled to a resonator; a holonomic gate between any two qubits can be implemented by tuning their frequencies on resonance with the resonator and applying a two-tone drive to one of them. This gate represents an important step towards the all-geometric realization of scalable quantum computation on a superconducting platform.
description: 13 pages, 11 figures, 2 tables
Kinematics of evaporating black holes
Creators: name: Vilkovisky, G. A.
Publisher: name: arXiv
Year: 2005
Subjects: subject: High Energy Physics - Theory (hep-th)
subject: Astrophysics (astro-ph)
subject: General Relativity and Quantum Cosmology (gr-qc)
subject: FOS: Physical sciences

description: The correspondence principle and causality divide the spacetime of a macroscopic collapsing mass into three regions: classical, semiclassical, and ultraviolet. The semiclassical region covers the entire evolution of the black hole from the macroscopic to the microscopic scale if the latter is reached. It is shown that the metric in the semiclassical region is expressed purely kinematically through the Bondi charges. The only quantum calculation needed is the one of radiation at infinity. The ultraviolet ignorance of semiclassical theory is irrelevant. The metric with arbitrary Bondi charges is obtained and studied.
description: 58 pages, 2 figures. Latex 2.09. Figures PNG
Are prerequisite skills needed in advanced placement courses?
Creators: name: Marinucci, Mark
Publisher: name: Maryland Shared Open Access Repository
Year: 2013
Subjects: subject: Education -- Research papers (Graduate)

description: This Action Research attempted to determine if having prerequisite skills impact the success rate of the students in A.P. courses and if the students other courses were affected by the A.P. placement. One of the major decisions that school schedulers deal with is deciding who should be enrolled in Advanced Placement (A.P.) courses and who should not. One school of thought is that A.P. courses should be open for a greater amount of students who have not completed the prerequisite skills, as they would benefit from the additional rigor and demands of the course. Another school of thought is that by letting everyone into the class a teacher can only differentiate so much before the A.P. class becomes “watered down.” A third consideration is that minorities are underrepresented in A.P. classrooms across the country. What was found was that the students who had significant deficiencies in prerequisite skills also had significant disparities in their grades as compared to the grades of the students who did complete the prerequisite skills.
Bistatic UAV-Based Repeater SAR for 3D Object Localization
Creators: name: Kanz, Julian
name: Bonfert, Christina
name: Riekenbrauck, Ron
name: Waldschmidt, Christian
Publisher: name: Universität Ulm
Year: 2024
Subjects: subject: UAV
subject: Multicopter
subject: Bistatic SAR
subject: Forward Scattering
subject: Multistatic radar
subject: Radar network
subject: Radar repeater system
subject: DDC 620 / Engineering & allied operations
subject: Quadrotor helicopters
subject: Bistatic radar
subject: Synthetic aperture radar
subject: Quadrocopter
subject: Bistatisches Radar
subject: Multistatisches Radar
subject: Radar
subject: Synthetische Apertur

description: A unmanned aerial vehicle (UAV) based radar system is augmented by a low-complexity repeater on a second UAV that allows to locate objects in 3D space. The repeater provides complementary height information, that cannot be gathered from the monostatic radar signal alone, since linear synthetic aperture radar (SAR) fails to resolve all spatial dimensions. The high-resolution SAR image determined by the radar system can then be evaluated at the correct height, resulting in a precise object localization. Based on simulation and measurement, it is shown that the position of objects can be determined with an accuracy of a few centimeters.
Using Reader’s Theatre to Improve Oral Reading Fluency
Creators: name: Hart, Erin
Publisher: name: Maryland Shared Open Access Repository
Year: 2013
Subjects: subject: Education -- Research papers (Graduate)

description: The purpose of this study was to determine the effects of Reader’s Theatre on the reading
fluency achievement of first grade students. The mid-year/end of year oral reading fluency
portion of the Dynamic Indicators of Basic Early Learning Skills (DIBELS) was used as the
pretest/posttest for this study. A treatment group, receiving Reader’s Theatre, and a control
group were chosen based on similar pretest scores. Reader’s Theatre was administered for five
weeks, while the control group received the normal small group reading instruction. While the
results of the study demonstrated that the students in both groups showed gains in oral reading
fluency, the control group significantly out-preformed the Reader’s Theatre group on the posttest.
This study contains internal and external threats to validity. Research concerning best
practices for reading fluency instruction should continue; fluency is needed for strong
independent reading comprehension.
Orbital Landau level dependence of the fractional quantum Hall effect in quasi-two dimensional electron layers: finite-thickness effects
Creators: name: Peterson, Michael R.
name: Jolicoeur, Th.
name: Sarma, S. Das
Publisher: name: arXiv
Year: 2008
Subjects: subject: Mesoscale and Nanoscale Physics (cond-mat.mes-hall)
subject: Strongly Correlated Electrons (cond-mat.str-el)
subject: FOS: Physical sciences

description: The fractional quantum Hall effect (FQHE) in the second orbital Landau level at filling factor 5/2 remains enigmatic and motivates our work. We consider the effect of the quasi-2D nature of the experimental FQH system on a number of FQH states (fillings 1/3, 1/5, 1/2) in the lowest, second, and third Landau levels (LLL, SLL, TLL,) by calculating the overlap, as a function of quasi-2D layer thickness, between the exact ground state of a model Hamiltonian and the consensus variational wavefunctions (Laughlin wavefunction for 1/3 and 1/5 and the Moore-Read Pfaffian wavefunction for 1/2). Using large overlap as a stability, or FQHE robustness, criterion we find the FQHE does not occur in the TLL (for any thickness), is the most robust for zero thickness in the LLL for 1/3 and 1/5 and for 11/5 in the SLL, and is most robust at finite-thickness (4-5 magnetic lengths) in the SLL for the mysterious 5/2 state and the 7/3 state. No FQHE is found at 1/2 in the LLL for any thickness. We examine the orbital effects of an in-plane (parallel) magnetic field finding its application effectively reduces the thickness and could destroy the FQHE at 5/2 and 7/3, while enhancing it at 11/5 as well as for LLL FQHE states. The in-plane field effects could thus be qualitatively different in the LLL and the SLL by virtue of magneto-orbital coupling through the finite thickness effect. In the torus geometry, we show the appearance of the threefold topological degeneracy expected for the Pfaffian state which is enhanced by thickness corroborating our findings from overlap calculations. Our results have ramifications for wavefunction engineering--the possibility of creating an optimal experimental system where the 5/2 FQHE state is more likely described by the Pfaffian state with applications to topological quantum computing.
description: 27 pages, 20 figures, revised version (with additional author) as accepted for publication in Physical Review B
Quantum-accelerated multilevel Monte Carlo methods for stochastic differential equations in mathematical finance
Creators: name: An, Dong
name: Linden, Noah
name: Liu, Jin-Peng
name: Montanaro, Ashley
name: Shao, Changpeng
name: Wang, Jiasu
Publisher: name: arXiv
Year: 2020
Subjects: subject: Quantum Physics (quant-ph)
subject: Numerical Analysis (math.NA)
subject: Computational Finance (q-fin.CP)
subject: FOS: Physical sciences
subject: FOS: Mathematics
subject: FOS: Economics and business

description: Inspired by recent progress in quantum algorithms for ordinary and partial differential equations, we study quantum algorithms for stochastic differential equations (SDEs). Firstly we provide a quantum algorithm that gives a quadratic speed-up for multilevel Monte Carlo methods in a general setting. As applications, we apply it to compute expectation values determined by classical solutions of SDEs, with improved dependence on precision. We demonstrate the use of this algorithm in a variety of applications arising in mathematical finance, such as the Black-Scholes and Local Volatility models, and Greeks. We also provide a quantum algorithm based on sublinear binomial sampling for the binomial option pricing model with the same improvement.
description: 37 pages, 6 figures
THE ECONOMIC STRUCTURE OF THE FOX VALLEY: A STUDY OF ECONOMIC OPPORTUNITY
Creators: name: Muench, David
name: Deller, Steven C.
name: Muench, David
name: Deller, Steven C.
Publisher: name: Unknown
Year: 2001
Subjects: Community/Rural/Urban Development

description: This study was commissioned by the Fox Cities Economic Development Partnership and undertaken by the University of Wisconsin-Extension. The intent of the study is to identify potential areas of economic growth and development for the region. The ultimate goal of this study is to provide insight and identify potential future policy directions by the Partnership and other economic development practitioners and policy makers.
The Number Density of Intermediate and High Luminosity Active Galactic Nuclei at z~2-3
Creators: name: Barger, A. J.
name: Cowie, L. L.
Publisher: name: arXiv
Year: 2005
Subjects: subject: Astrophysics (astro-ph)
subject: FOS: Physical sciences

description: We use the combination of the 2 Ms Chandra X-ray image, new J and H band images, and the Spitzer IRAC and MIPS images of the Chandra Deep Field-North to obtain high spectroscopic and photometric redshift completeness of high and intermediate X-ray luminosity sources in the redshift interval z=2-3. We measure the number densities of z=2-3 active galactic nuclei (AGNs) and broad-line AGNs in the rest-frame 2-8 keV luminosity intervals 10^44-10^45 and 10^43-10^44 ergs/s and compare with previous lower redshift results. We confirm a decline in the number densities of intermediate-luminosity sources at z>1. We also measure the number density of z=2-3 AGNs in the luminosity interval 10^43-10^44.5 ergs/s and compare with previous low and high-redshift results. Again, we find a decline in the number densities at z>1. In both cases, we can rule out the hypothesis that the number densities remain flat to z=2-3 at above the 5-sigma level.
description: 8 pages, Accepted by The Astrophysical Journal (scheduled for 10 Dec 2005)
School-wide Positive Behavior Intervention Programs and Aggressive Behavior in Elementary Students
Creators: name: Johnson, Barbara
Publisher: name: Maryland Shared Open Access Repository
Year: 2013
Subjects: subject: Education -- Research papers (Graduate)

description: The purpose of this study is to review a school-wide Positive Behavior Intervention and Supports program (PBIS) and to discuss its effectiveness in decreasing physically aggressive behavior in elementary students over time as school personnel and students become more familiar with the program and its components get fine-tuned. This study used a retrospective pre-experimental design with a variant of a one-group pretest-post-test design. Subjects (n=9) served as their own controls. Subjects (n=9) were selected based on a “high” score on the dependent variable under the first condition if they had two or more referrals for physically aggressive behavior in the first school year of implementation and were considered frequent offenders. Dependent variable data was collected over the first school, 2011-2012 and the second year, 2012-2013 in a diverse public elementary school. During the 2012-2013 school year, revisions were made to the program and more individualized interventions were put in place for the frequent offenders.
There was no significant difference in the mean number of office referrals in the first year 2011-2012 (Mean = 6.00, SD = 4.42) and the second year of 2012-2013 (Mean = 4.89, SD = 4.14) [t (8) = .52, p > .05] among frequent offenders. Implications are discussed including the need for PBIS team needs to provide additional training to the staff regarding how to manage individual students with more aggressive and challenging behaviors. Targeted, data-driven interventions must be put in place for the frequent offenders.
Revealing strong correlations in higher order transport statistics: a noncrossing approximation approach
Creators: name: Erpenbeck, André
name: Gull, Emanuel
name: Cohen, Guy
Publisher: name: arXiv
Year: 2020
Subjects: subject: Mesoscale and Nanoscale Physics (cond-mat.mes-hall)
subject: Strongly Correlated Electrons (cond-mat.str-el)
subject: FOS: Physical sciences

description: We present a method for calculating the full counting statistics of a nonequilibrium quantum system based on the propagator noncrossing approximation (NCA). This numerically inexpensive method can provide higher order cumulants for extended parameter regimes, rendering it attractive for a wide variety of purposes. We compare NCA results to Born-Markov quantum master equations (QME) results to show that they can access different physics, and to numerically exact inchworm quantum Monte-Carlo data to assess their validity. As a demonstration of its power, the NCA method is employed to study the impact of correlations on higher order cumulants in the nonequilibrium Anderson impurity model. The four lowest order cumulants are examined, allowing us to establish that correlation effects have a profound influence on the underlying transport distributions. Higher order cumulants are therefore demonstrated to be a proxy for the presence of Kondo correlations in a way that cannot be captured by simple QME methods.
ISSUES IN DATA MANAGEMENT OF EXPENDITURE SURVEYS: AN EXAMPLE FROM THE COLOMBIAN 1984-85 URBAN SURVEY
Creators: name: Perali, Carlo Federico
name: Cox, Thomas L.
name: Perali, Carlo Federico
name: Cox, Thomas L.
Publisher: name: Unknown
Year: 1995
Subjects: Research Methods/ Statistical Methods

description: This study examines some of the issues that are often encountered when analysing the socio-economic information of expenditure surveys using the Colombian 1985 urban expenditure survey as an example. This study discusses the problem of estimating prices when only information on expenditures and demographic characteristics is available, the options available when aggregating commodities and defining demographic or labour information, and the advantages and drawbacks in choosing total expenditure as a proxy for income or as the metric for poverty measurement. The study also applies non-parametric density estimation as a form of exploratory data analysis and as a means to learn from the data about the most proper parametric specification.
A Dynamic Principal-Agent Model of Human-Mediated Aquatic Species Invasions
Creators: name: Moore, Rebecca
name: MacPherson, Alexander J.
name: Provencher, Bill
name: Moore, Rebecca
name: MacPherson, Alexander J.
name: Provencher, Bill
Publisher: name: Unknown
Year: 2005
Subjects: Environmental Economics and Policy

description: This paper presents an integrated ecological and economic model of aquatic plant species invasions in which resource users are the primary vector of species colonization. A random utility model of boater behavior is combined with ecological information about the invader and the landscape to form a dynamic principal-agent model in which the principal is a manager concerned with the interseasonal spread of invasive species across lakes, and agents are recreational boaters making a series of intraseasonal trip decisions to maximize random utility during the course of the season. Agent behavior is sensitive to both the degradation of environmental quality on colonized lakes and the actions taken by resource managers to control the spread of the invasive species. As such, this paper represents the first attempt in the literature to endogenize resource user behavior in the management of a species invasion, allowing us to appreciate the full impact of different policy scenarios. The results of a simple, simulated case study of an Eurasian watermilfoil (myriophyllum spicatum) invasion of a hypothetical system of four lakes are presented. These results highlight some interesting aspects of the optimal management policies under two different management objectives: maximizing welfare and minimizing milfoil spread. The size of the problem is a significant obstacle to a "real world" application. Recent advancements in both random utility modeling and dynamic programming simulation models could considerably ease these constraints.
Rohner, Peter (Hrsg.), Mitmenschlichkeit - eine Illusion?
Creators: name: Gerlitz, Peter
Publisher: name: Ökumenische Rundschau
Year: 2025

description: Ökumenische Rundschau, Bd. 23 Nr. 1 (1974): Ökumenische Rundschau, Band 23, Heft 1
Symmetry Breaking in String Theory
Creators: name: Giannakis, Ioannis
Publisher: name: arXiv
Year: 2005
Subjects: subject: High Energy Physics - Theory (hep-th)
subject: FOS: Physical sciences

description: In this paper we discuss symmetry breaking in string theory. Spacetime symmetries are implemented as inner automorphisms of the underlying superconformal algebra. Conserved currents generate unbroken spacetime symmetries. As we deform the classical solutions of the string equations of motion, the deformed currents continue to generate spontaneously broken symmetries even though they cease to commute with the string Hamiltonian. We illustrate these ideas by studying supersymmetry breaking in a non-trivial string background.
description: 5 pages, Latex, to appear in the proceedings of the 32nd International Conference on High Energy Physics (ICHEP 04), Beijing, China, 16-22 August 2004