cometadata/datacite-rtg-text-other-reclassification-records huggingface dataset:
Correlation between Nutrients Distribution and Location of Green Mussel Farm Areas at the Coast of Phetchaburi, Phetchaburi Province, Thailand
Creators: name: Urairat Rattanavijit
name: Tarnchalanukit, Wit
name: Chunkao, Kasem
name: Onanong Phewnil
Publisher: name: Thai Society of Higher Education Institutes on Environment
Year: 2019
Subjects: Correlation
Nutrient distribution
Green mussel
Location
Phetchaburi Province

description: EnvironmentAsia, 12, 2, 87-95
Geschichtsbilder und ihre museale Präsentation. Ausgewählte Beiträge zur Geschichte der Deutschen in Polen in Vergangenheit und Gegenwart
Creators: name: Hofmann, Andreas R.
Publisher: name: Zeitschrift für Ostmitteleuropa-Forschung
Year: 2010

description: Zeitschrift für Ostmitteleuropa-Forschung, Bd. 59 Nr. 1 (2010)
The fluid mechanics of poohsticks
Creators: name: Cartwright, Julyan H. E.
name: Piro, Oreste
Publisher: name: arXiv
Year: 2021
Subjects: subject: Fluid Dynamics (physics.flu-dyn)
subject: Dynamical Systems (math.DS)
subject: Chaotic Dynamics (nlin.CD)
subject: FOS: Physical sciences
subject: FOS: Mathematics

description: 2019 is the bicentenary of George Gabriel Stokes, who in 1851 described the drag - Stokes drag - on a body moving immersed in a fluid, and 2020 is the centenary of Christopher Robin Milne, for whom the game of poohsticks was invented; his father A. A. Milne's "The House at Pooh Corner", in which it was first described in print, appeared in 1928. So this is an apt moment to review the state of the art of the fluid mechanics of a solid body in a complex fluid flow, and one floating at the interface between two fluids in motion. Poohsticks pertains to the latter category, when the two fluids are water and air.
description: Review article, part of a Philosophical Transactions theme issue 'Stokes at 200'
Trained Model for SSD Resnext50_32x4d_fpn Tensorflow for MLPerf Inference
Creators: name: Kiswani, Ahmad
name: Gonzalez, Pablo
Publisher: name: Zenodo
Year: 2021

description: Application: Single-stage Object Detection Base Model: Resnext50 Framework: Tensorflow 2.6 Quality: The COCO mAP(IoU=0.50:0.95) on 5000 validation images is 36.7% Precision: single-precision float Is Quantized: no Is ONNX: no Dataset: COCO val-2017
Fluid mechanics of impingement region in an experimental simulation of a twin-wire paper machine
Creators: name: Gune, Nandakumar Vithal
Publisher: name: University of British Columbia
Year: 2010

description: An experiment with impinging jet flows in narrow channels having moving walls was carried out. The channel was formed by placing two counter-rotating cylinders near each other. This geometry represents a simplified case of the impingement zone of a formation wedge on a twin-wire paper machine. The variables considered in this study were jet velocity, roll velocity, jet width and, roll gap. The working fluid was water. Wall shear stress signals and wall static pressure signals through the flow zone were recorded using signal recovery and averaging techniques. Flow velocity at a location below the mid-nip was measured using hot film anemometry from which mean velocity at the mid-nip was deduced. Flow visualisation experiments were also conducted. A very short duration synchronised flash (synchronised with roll rotation) was used to take the flow pictures. It was observed that under certain conditions the impinging jet loses its momentum as it encounters an adverse pressure gradient in the flow zone. This results in a reversal of flow leading to a pond development above the nip. A relation has been obtained which sets conditions of roll speed, jet speed, jet width and roll gap under which stable operation (no backflow) can be achieved. Flow pictures showed the presence of large quantities of entrained air. Entrained air was seen to pass through the flow zone as columns of air bubbles when the jet velocity was higher than the roll velocity. For jet velocity less than roll velocity, the passage of entrained air through the flow zone resulted in formation of rows of air bubbles. Wall static pressure measurements revealed development of large positive pressures and pressure gradients in the impingement region. The pressure build up was believed to be due to loss of kinetic energy of the impinging jet, interaction of the wall boundary layers on either wall with flow in the core region (boundary layer interaction) and, reduction of cross sectional area of the flow geometry. Wall shear stress levels were lower than pressure levels encountered in the flow. Hence it was concluded that the flow is mainly a pressure driven type, and that the shear stress values show variation of velocity gradients and subsequently velocity of the flow as affected by pressure changes. A flow model is proposed to explain the reversal of flow leading to pond development. Relevance of this study to the analysis of a formation wedge of a twin-wire paper machine is explained. The study indicates that fluid mechanics of such a formation wedge should strongly affect the formation of paper web and machine runnability. The formation of streaks and machine direction basis weight variation observed in industrial situations may possibly be explained by the observed entrained air passage through the experimental flow nip.
Enhanced Ferromagnetic Stability in Cu Doped Passivated GaN Nanowires
Creators: name: Xiang, H. J.
name: Wei, Su-Huai
Publisher: name: arXiv
Year: 2008
Subjects: subject: Materials Science (cond-mat.mtrl-sci)
subject: FOS: Physical sciences

description: Density functional calculations are performed to investigate the room temperature ferromagnetism in GaN:Cu nanowires (NWs). Our results indicate that two Cu dopants are most stable when they are near each other. Compared to bulk GaN:Cu, we find that magnetization and ferromagnetism in Cu doped NWs is strongly enhanced because the band width of the Cu td band is reduced due to the 1D nature of the NW. The surface passivation is shown to be crucial to sustain the ferromagnetism in GaN:Cu NWs. These findings are in good agreement with experimental observations and indicate that ferromagnetism in this type of systems can be tuned by controlling the size or shape of the host materials.
description: Nano Lett., ASAP Article, 10.1021/nl080261n
Diktatur - Krieg - Vertreibung. Erinnerungskulturen in Tschechien, der Slowakei und Deutschland seit 1945
Creators: name: Alexander, Manfred
Publisher: name: Zeitschrift für Ostmitteleuropa-Forschung
Year: 2005

description: Zeitschrift für Ostmitteleuropa-Forschung, Bd. 54 Nr. 4 (2005)
Testing for directed information graphs
Creators: name: Molavipour, Sina
name: Bassi, Germán
name: Skoglund, Mikael
Publisher: name: arXiv
Year: 2021
Subjects: subject: Information Theory (cs.IT)
subject: FOS: Computer and information sciences

description: In this paper, we study a hypothesis test to determine the underlying directed graph structure of nodes in a network, where the nodes represent random processes and the direction of the links indicate a causal relationship between said processes. Specifically, a k-th order Markov structure is considered for them, and the chosen metric to determine a connection between nodes is the directed information. The hypothesis test is based on the empirically calculated transition probabilities which are used to estimate the directed information. For a single edge, it is proven that the detection probability can be chosen arbitrarily close to one, while the false alarm probability remains negligible. When the test is performed on the whole graph, we derive bounds for the false alarm and detection probabilities, which show that the test is asymptotically optimal by properly setting the threshold test and using a large number of samples. Furthermore, we study how the convergence of the measures relies on the existence of links in the true graph.
description: 55th Annual Allerton Conference on Communication, Control, and Computing (Allerton), 2017
Quantum Belief Propagation
Creators: name: Hastings, M. B.
Publisher: name: arXiv
Year: 2007
Subjects: subject: Strongly Correlated Electrons (cond-mat.str-el)
subject: Quantum Physics (quant-ph)
subject: FOS: Physical sciences

description: We present an accurate numerical algorithm, called quantum belief propagation (QBP), for simulation of one-dimensional quantum systems at non-zero temperature. The algorithm exploits the fact that quantum effects are short-range in these systems at non-zero temperature, decaying on a length scale inversely proportional to the temperature. We compare to exact results on a spin-1/2 Heisenberg chain. Even a very modest calculation, requiring diagonalizing only 10-by-10 matrices, reproduces the peak susceptibility with a relative error of less than $10^{-5}$, while more elaborate calculations further reduce the error.
description: 4 pages, 1 figure; revised time estimates due to improved implementation. Typographical corrections to Eq. 7 made; thanks to David Poulin for pointing out the mistake
A novel in vivo approach to assess strains of the human abdominal wall under known intraabdominal pressure
Creators: name: Lubowiecka, Izabela
name: Szepietowska, Katarzyna
name: Tomaszewska, Agnieszka
name: Bielski, Paweł Michał
name: Chmielewski, Michał
name: Lichodziejewska-Niemierko, Monika
name: Szymczak, Czesław
Publisher: name: arXiv
Year: 2021
Subjects: subject: Medical Physics (physics.med-ph)
subject: Tissues and Organs (q-bio.TO)
subject: FOS: Physical sciences
subject: FOS: Biological sciences

description: The study concerns mechanical behaviour of a living human abdominal wall. A better mechanical understanding of a human abdominal wall and recognition of its material properties is required to find mechanically compatible surgical meshes to significantly improve the treatment of ventral hernias. A non-invasive methodology, based on in vivo optical measurements is proposed to determine strains of abdominal wall corresponding to a known intraabdominal pressure. The measurement is performed in the course of a standard procedure of peritoneal dialysis. A dedicated experimental stand is designed for the experiment. The photogrammetric technique is employed to recover the three-dimensional surface geometry of the anterior abdominal wall at the initial and terminal instants of the dialysis. This corresponds to two deformation states, before and after filling the abdominal cavity with dialysis fluid. The study provides information on strain fields of living human abdominal wall. The inquiry is aimed at principal strains and their directions, observed at the level from -10% to 17%. The intraabdominal pressure related to the amount of introduced dialysis fluid measured within the medical procedure covers the range 11-18.5 cmH$_2$O. The methodology leads to the deformation state of the abdominal wall according to the corresponding loading conditions. Therefore, the study is a step towards an identification of mechanical properties of living human abdominal wall.
Beppo Beyerl, Die Beneš-Dekrete. Zwischen tschechischer Identität und deutscher Begehrlichkeit.
Creators: name: Brandes, Detlef
Publisher: name: Zeitschrift für Ostmitteleuropa-Forschung
Year: 2003

description: Zeitschrift für Ostmitteleuropa-Forschung, Bd. 52 Nr. 3 (2003)
Cosmological aspects of cubic Galileon massive gravity
Creators: name: Aslmarand, Shahabeddin M.
name: Akbarieh, Amin Rezaei
name: Izadi, Yousef
name: Kazempour, Sobhan
name: Shao, Lijing
Publisher: name: arXiv
Year: 2021
Subjects: subject: General Relativity and Quantum Cosmology (gr-qc)
subject: High Energy Physics - Theory (hep-th)
subject: FOS: Physical sciences

description: Cubic Galileon massive gravity is a development of de Rham-Gabadadze-Tolly (dRGT) massive gravity theory is which the space of the Stueckelberg field is broken. We consider the cubic Galileon term as a scalar field coupled to the graviton filed. We present a detailed study of the cosmological aspects of this theory of gravity. We analyze self-accelerating solutions of the background equations of motion to explain the accelerated expansion of the Universe. Exploiting the latest Union2 Type Ia Supernovea (SNIa) dataset, which consists of 557 SNIa, we show that cubic Galileon massive gravity theory is consistent with the observations. We also examine the tensor perturbations within the framework of this model and find an expression for the dispersion relation of gravitational waves, and show that it is consistent with the observational results.
Dějiny Moravy a Matice moravská. Problémy a perspektivy. Sborník příspěvků z vědečké konference konané v dnech 24.-25. listopada 1999 v Brně
Creators: name: Kessler, Wolfgang
Publisher: name: Zeitschrift für Ostmitteleuropa-Forschung
Year: 2002

description: Zeitschrift für Ostmitteleuropa-Forschung, Bd. 51 Nr. 4 (2002)
Multistable Solitons in Higher-Dimensional Cubic-Quintic Nonlinear Schroedinger Lattices
Creators: name: Chong, C.
name: Carretero-Gonzalez, R.
name: Malomed, B. A.
name: Kevrekidis, P. G.
Publisher: name: arXiv
Year: 2008
Subjects: subject: Pattern Formation and Solitons (nlin.PS)
subject: FOS: Physical sciences

description: We study the existence, stability, and mobility of fundamental discrete solitons in two- and three-dimensional nonlinear Schroedinger lattices with a combination of cubic self-focusing and quintic self-defocusing onsite nonlinearities. Several species of stationary solutions are constructed, and bifurcations linking their families are investigated using parameter continuation starting from the anti-continuum limit, and also with the help of a variational approximation. In particular, a species of hybrid solitons, intermediate between the site- and bond-centered types of the localized states (with no counterpart in the 1D model), is analyzed in 2D and 3D lattices. We also discuss the mobility of multi-dimensional discrete solitons that can be set in motion by lending them kinetic energy exceeding the appropriately crafted Peierls-Nabarro barrier; however, they eventually come to a halt, due to radiation loss.
description: 12 pages, 17 figures
Water Quality Assessment by Using of Water Quality Index for Mak Khaeng Canal, Udon Thani Province, Thailand
Creators: name: Mathana Wongaree
Publisher: name: Thai Society of Higher Education Institutes on Environment
Year: 2019
Subjects: Water quality assessment
Surface water quality
PCD-water quality index
Mak Khaeng canal
Mueang Udon Thani

description: EnvironmentAsia, 12, 2, 96-104
Prompt high-energy neutrinos from gamma-ray bursts in photospheric and synchrotron self-Compton scenarios
Creators: name: Murase, Kohta
Publisher: name: arXiv
Year: 2008
Subjects: subject: Astrophysics (astro-ph)
subject: High Energy Physics - Phenomenology (hep-ph)
subject: FOS: Physical sciences

description: We investigate neutrino emission from gamma-ray bursts (GRBs) under alternative scenarios for prompt emission (the photospheric and synchrotron self-Compton scenarios) rather than the classical optically thin synchrotron scenario. In the former scenario, we find that neutrinos from the pp reaction can be very important at energies around 10-100 TeV. They may be detected by IceCube/KM3Net and useful as a probe of baryon acceleration around/below the photosphere. In the latter scenario, we may expect about EeV pgamma neutrinos produced by soft photons. Predicted spectra are different from that in the classical scenario, and neutrinos would be useful as one of the clues to the nature of GRBs (the jet composition, emission radius, magnetic field and so on).
description: 5 pages, 3 figures, replaced to match the final version published as PRD Rapid Communication, 78, 101302. Minor typos fixed
Alter Kacyzne, Poyln. Eine untergegangene jüdische Welt
Creators: name: Friedrich, Klaus-Peter
Publisher: name: Zeitschrift für Ostmitteleuropa-Forschung
Year: 2003

description: Zeitschrift für Ostmitteleuropa-Forschung, Bd. 52 Nr. 1 (2003)
Karsten Brüggemann, Die Gründung der Republik Estland und das Ende des "Einen und unteilbaren Rußland". Die Petrograder Front des russischen Bürgerkriegs 1918-1920
Creators: name: Pistohlkors, Gert Von
Publisher: name: Zeitschrift für Ostmitteleuropa-Forschung
Year: 2004

description: Zeitschrift für Ostmitteleuropa-Forschung, Bd. 53 Nr. 1 (2004)
Jan Björn Potthast, Das jüdische Zentralmuseum der SS in Prag. Gegnerforschung und Völkermord im Nationalsozialismus.
Creators: name: Küpper, René
Publisher: name: Zeitschrift für Ostmitteleuropa-Forschung
Year: 2003

description: Zeitschrift für Ostmitteleuropa-Forschung, Bd. 52 Nr. 3 (2003)
Broadband Spectral and Timing Properties of MAXI J1348-630 using AstroSat and NICER Observations
Creators: name: Jithesh, V.
name: Misra, Ranjeev
name: Maqbool, Bari
name: Mall, Gitika
Publisher: name: arXiv
Year: 2021
Subjects: subject: High Energy Astrophysical Phenomena (astro-ph.HE)
subject: FOS: Physical sciences

description: We present broadband X-ray spectral-timing analysis of the new Galactic X-ray transient MAXI~J1348--630 using five simultaneous {\it AstroSat} and {\it NICER} observations. Spectral analysis using {\it AstroSat} data identify the source to be in the soft state for the first three observations and in a faint and bright hard state for the next two. Quasi-periodic oscillations at $\sim 0.9$ and $\sim 6.9$\,Hz, belonging to the type-C and type-A class are detected. In the soft state, the power density spectra are substantially lower (by a factor $> 5$) for the {\it NICER} (0.5--12 keV) band compared to the {\it AstroSat}/LAXPC (3--80 keV) one, confirming that the disk is significantly less variable than the Comptonization component. For the first time, energy-dependent fractional rms and time lag in the 0.5--80 keV energy band was measured at different Fourier frequencies, using the bright hard state observation. Hard time lag is detected for the bright hard state, while the faint one shows evidence for soft lag. A single-zone propagation model fits the LAXPC results in the energy band 3--80 keV with parameters similar to those obtained for Cygnus X--1 and MAXI J1820+070. Extending the model to lower energies, reveals qualitative similarities but having quantitative differences with the {\it NICER} results. These discrepancies could be because the {\it NICER} and {\it AstroSat} data are not strictly simultaneous and because the simple propagation model does not take into account disk emission. The results highlight the need for more joint coordinated observations of such systems by {\it NICER} and {\it AstroSat}.
description: 14 Pages, 13 Figures, 3 Tables. Accepted for publication in MNRAS
How do the grains slide in fine-grained zirconia polycrystals at high temperature?
Creators: name: Daraktchiev, M.
name: Schaller, R.
name: Gremillard, L.
name: Epicier, T.
name: Chevalier, J.
name: Fantozzi, G.
Publisher: name: arXiv
Year: 2007
Subjects: subject: Materials Science (cond-mat.mtrl-sci)
subject: FOS: Physical sciences

description: Degradation of mechanical properties of zirconia polycrystals is hardly discussed in terms of solution-precipitation grain-boundary sliding due to experimental controversies over imaging of intergranular amorphous phases at high and room temperatures. Here, the authors applied the techniques of mechanical spectroscopy and transmission electron microscopy (TEM) to shed light on the amorphization of grain interfaces at high temperature where the interface-reaction determines the behaviour of fine-grained zirconia polycrystals. They present mechanical spectroscopy results, which yield evidences of an intergranular amorphous phase in silica doped and high-purity zirconia at high temperature. Quenching of zirconia polycrystals reveals an intergranular amorphous phase on TEM images at room temperature.
description: 12 pages, 3 figures
Revised bolometric corrections and interstellar extinction coefficients for the ACS and WFPC2 photometric systems
Creators: name: Girardi, L.
name: Dalcanton, J.
name: Williams, B.
name: de Jong, R.
name: Gallart, C.
name: Monelli, M.
name: Groenewegen, M. A. T.
name: Holtzman, J. A.
name: Olsen, K. A. G.
name: Seth, A. C.
name: Weisz, D. R.
Publisher: name: arXiv
Year: 2008
Subjects: subject: Astrophysics (astro-ph)
subject: FOS: Physical sciences

description: We present extensive tables of bolometric corrections and interstellar extinction coefficients for the WFPC2 and ACS (both WFC and HRC) photometric systems. They are derived from synthetic photometry applied to a database of spectral energy distributions covering a large range of effective temperatures, surface gravity, and metal content. Carbon stars are also considered. The zero-points take into consideration the new high-accuracy Vega fluxes from Bohlin. These tables are employed to transform Padova isochrones into WFPC2 and ACS photometric systems using interstellar extinction coefficients on a star-to-star basis. All data are available either in tabular form or via an interactive web interface in the case of the isochrones. Preliminary tables for the WFC3 camera are also included in the database.
description: 18 pages. To appear on PASP, May 2008 issue. The database is in http://stev.oapd.inaf.it/dustyAGB07
Proposed rapid detection of nuclear spins with entanglement-enhanced sensors
Creators: name: Hakoshima, Hideaki
name: Matsuzaki, Yuichiro
name: Ishikawa, Toyofumi
Publisher: name: arXiv
Year: 2021
Subjects: subject: Quantum Physics (quant-ph)
subject: FOS: Physical sciences

description: Recently, there have been significant developments to detect nuclear spins with an nitrogen vacancy (NV) center in diamond. However, due to the nature of the short range dipole-dipole interaction, it takes a long time to detect distant nuclear spins with the NV centers. Here, we propose a rapid detection of nuclear spins with an entanglement between the NV centers. We show that the necessary time to detect the nuclear spins with the entanglement is several orders of magnitude shorter than that with separable NV centers. Our result pave the way for new applications in nanoscale nuclear magnetic resonance spectroscopy.
description: 14 pages, 4 figures
The Inhomogeneous Background of H2 Dissociating Radiation During Cosmic Reionization
Creators: name: Ahn, Kyungjin
name: Shapiro, Paul R.
name: Iliev, Ilian T.
name: Mellema, Garrelt
name: Pen, Ue-Li
Publisher: name: arXiv
Year: 2008
Subjects: subject: Astrophysics (astro-ph)
subject: FOS: Physical sciences

description: The first, self-consistent calculations of the cosmological H_2 dissociating UV background produced during the epoch of reionization (EOR) by the sources of reionization are presented. Large-scale radiative transfer simulations of reionization trace the impact of all the ionizing starlight on the IGM from all the sources in our simulation volume down to dwarf galaxies of mass ~ 10^8 solar mass, identified by very high-resolution N-body simulations, including the self-regulating effect of IGM photoheating on dwarf galaxy formation. The UV continuum emitted below 13.6 eV by each source is then transferred through the same IGM, attenuated by atomic H Lyman series resonance lines, to predict the evolution of the inhomogeneous background in the Lyman-Werner band of H_2 between 11 and 13.6 eV.
description: First Stars III Conference Proceedings; This is a summarized version of the journal paper to be submitted soon
Co-optimising Robot Morphology and Controller in a Simulated Open-Ended Environment
Creators: name: Stensby, Emma Hjellbrekke
name: Ellefsen, Kai Olav
name: Glette, Kyrre
Publisher: name: arXiv
Year: 2021
Subjects: subject: Neural and Evolutionary Computing (cs.NE)
subject: FOS: Computer and information sciences

description: Designing robots by hand can be costly and time consuming, especially if the robots have to be created with novel materials, or be robust to internal or external changes. In order to create robots automatically, without the need for human intervention, it is necessary to optimise both the behaviour and the body design of the robot. However, when co-optimising the morphology and controller of a locomoting agent the morphology tends to converge prematurely, reaching a local optimum. Approaches such as explicit protection of morphological innovation have been used to reduce this problem, but it might also be possible to increase exploration of morphologies using a more indirect approach. We explore how changing the environment, where the agent locomotes, affects the convergence of morphologies. The agents' morphologies and controllers are co-optimised, while the environments the agents locomote in are evolved open-endedly with the Paired Open-Ended Trailblazer (POET). We compare the diversity, fitness and robustness of agents evolving in environments generated by POET to agents evolved in handcrafted curricula of environments. Our agents each contain of a population of individuals being evolved with a genetic algorithm. This population is called the agent-population. We show that agent-populations evolving in open-endedly evolving environments exhibit larger morphological diversity than agent-populations evolving in hand crafted curricula of environments. POET proved capable of creating a curriculum of environments which encouraged both diversity and quality in the populations. This suggests that POET may be capable of reducing premature convergence in co-optimisation of morphology and controllers.
description: 17 pages, 8 figures
Dorota Sula, Filie KL Gross-Rosen (wybór artykułów)
Creators: name: Hofmann, Andreas R.
Publisher: name: Zeitschrift für Ostmitteleuropa-Forschung
Year: 2003

description: Zeitschrift für Ostmitteleuropa-Forschung, Bd. 52 Nr. 1 (2003)
A bench scale experimental study of the treatment of milking centre effluent using a sequencing batch reactor
Creators: name: Tam, James Ping-Cheong
Publisher: name: University of British Columbia
Year: 2010

description: Until recently, the management of milking parlour effluent has received very little attention. The wastewater produced by milking operations comprises mainly milk solids and manure and can impose environmental threats to nearby water bodies if not properly treated before disposal. In this study, three bench-scale Sequencing Batch Biological Reactors were used to treat the UBC dairy barn milking centre wastewater. The experiment was designed to investigate the treatment efficiency of the reactors under different operating temperatures and different numbers of cycles employed per unit daily flow (for the same hydraulic retention time). Parameters studied included BOD₅, COD, Total Suspended Solids, NH₃-N, N0₂-NO₃-N and dissolved oxygen uptake. It was concluded that very high and consistent treatment efficiency can be achieved by using a Sequencing Batch Biological Reactor to treat milking centre wastes. Over 90% BOD₅ removal was observed in the room temperature and 30°C reactors. Even in low operating temperatures of 3.7 and 10.5°C, over 70% BOD₅ removal was attained. Removal of the other pollutional parameters studied was similarly excellent. Uncontrolled denitrification also occured to various degrees in all three reactors. It was also concluded that within the range studied in this experiment (4 to 8 cycles per day), changing the number of cycles employed per unit daily flow did not have any significant effect on the treatment efficiency of the reactors.
Josef Pfitzner a protektorátní Praha v letech 1939-1945. Sv. 2. Měsíční situační zprávy Josefa Pfitznera.
Creators: name: Küpper, René
Publisher: name: Zeitschrift für Ostmitteleuropa-Forschung
Year: 2003

description: Zeitschrift für Ostmitteleuropa-Forschung, Bd. 52 Nr. 3 (2003)
Serendipitous Chandra X-ray Detection of a Hot Bubble within the Planetary Nebula NGC 5315
Creators: name: Kastner, Joel
name: Montez,, Rodolfo
name: Balick, Bruce
name: De Marco, Orsola
Publisher: name: arXiv
Year: 2007
Subjects: subject: Astrophysics (astro-ph)
subject: FOS: Physical sciences

description: We report the serendipitous detection of the planetary nebula NGC 5315 by the Chandra X-ray Observatory. The Chandra imaging spectroscopy results indicate that the X-rays from this PN, which harbors a Wolf-Rayet (WR) central star, emanate from a T_X ~ 2.5x10^6 K plasma generated via the same wind-wind collisions that have cleared a compact (~8000 AU radius) central cavity within the nebula. The inferred X-ray luminosity of NGC 5315 is ~2.5x10^{32} erg s^{-1} (0.3-2.0 keV), placing this object among the most luminous such ``hot bubble'' X-ray sources yet detected within PNe. With the X-ray detection of NGC 5315, objects with WR-type central stars now constitute a clear majority of known examples of diffuse X-ray sources among PNe; all such ``hot bubble'' PN X-ray sources display well-defined, quasi-continuous optical rims. We therefore assert that X-ray-luminous hot bubbles are characteristic of young PNe with large central star wind kinetic energies and closed bubble morphologies. However, the evidence at hand also suggests that processes such as wind and bubble temporal evolution, as well as heat conduction and/or mixing of hot bubble and nebular gas, ultimately govern the luminosity and temperature of superheated plasma within PNe.
description: 15 pages, 4 figures; to appear in the Astrophysical Journal, 2008 Jan. 10 issue (Vol. 672)
A note on Chern coefficients and Cohen-Macaulay rings
Creators: name: Tam, Nguyen Thi Thanh
name: Truong, Hoang Le
Publisher: name: arXiv
Year: 2021
Subjects: subject: Commutative Algebra (math.AC)
subject: FOS: Mathematics

description: In this paper, we investigate the relationship between the index of reducibility and Chern coefficients for primary ideals. As an application, we give characterizations of a Cohen-Macaulay ring in terms of its type, irreducible multiplicity, and Chern coefficients with respect to certain parameter ideals in Noetherian local rings.
Fingerprint for Network Topologies
Creators: name: Guo, Yuchun
name: Chen, Changjia
name: Zhou, Shi
Publisher: name: arXiv
Year: 2008
Subjects: subject: Physics and Society (physics.soc-ph)
subject: FOS: Physical sciences

description: A network's topology information can be given as an adjacency matrix. The bitmap of sorted adjacency matrix(BOSAM) is a network visualisation tool which can emphasise different network structures by just looking at reordered adjacent matrixes. A BOSAM picture resembles the shape of a flower and is characterised by a series of 'leaves'. Here we show and mathematically prove that for most networks, there is a self-similar relation between the envelope of the BOSAM leaves. This self-similar property allows us to use a single envelope to predict all other envelopes and therefore reconstruct the outline of a network's BOSAM picture. We analogise the BOSAM envelope to human's fingerprint as they share a number of common features, e.g. both are simple, easy to obtain, and strongly characteristic encoding essential information for identification.
description: 12papes, 3 figures, in press
Building the road network for city-scale active transport simulation models
Creators: name: Jafari, Afshin
name: Both, Alan
name: Singh, Dhirendra
name: Gunn, Lucy
name: Giles-Corti, Billie
Publisher: name: arXiv
Year: 2021
Subjects: subject: Physics and Society (physics.soc-ph)
subject: FOS: Physical sciences

description: In this paper, we introduce and test our algorithm to create a road network representation for city-scale active transportation simulation models. The algorithm relies on open and universal data to ensure applicability for different cities around the world. In addition to the major roads, their geometries and the road attributes typically used in transport modelling (e.g., speed limit, number of lanes, permitted travel modes), the algorithm also captures minor roads usually favoured by pedestrians and cyclists, along with road attributes such as bicycle-specific infrastructure, traffic signals, and road gradient. Furthermore, it simplifies the network's complex geometries and merges parallel roads if applicable to make it suitable for large-scale simulations. To examine the utility and performance of the algorithm, we used it to create a network representation for Greater Melbourne, Australia and compared the output with a network created using an existing transport simulation toolkit along with another network from an existing city-scale transport model from the Victorian government. Through simulation experiments with these networks, we illustrated that our algorithm achieves a very good balance between simulation accuracy and run-time. For routed trips on our network for walking and cycling it is of comparable accuracy to the common network conversion tools in terms of travel distances of the shortest paths while being more than two times faster when used for simulating different sample sizes. Therefore, our algorithm offers a flexible solution for building accurate and efficient road networks for city-scale active transport models for different cities around the world.
Formation and evolution of compact binaries in globular clusters: II. Binaries with neutron stars
Creators: name: Ivanova, N.
name: Heinke, C.
name: Rasio, F. A.
name: Belczynski, K.
name: Fregeau, J.
Publisher: name: arXiv
Year: 2007
Subjects: subject: Astrophysics (astro-ph)
subject: FOS: Physical sciences

description: In this paper, the second of a series, we study the stellar dynamical and evolutionary processes leading to the formation of compact binaries containing neutron stars (NSs) in dense globular clusters (GCs). For this study, 70 dense clusters were simulated independently, with a total stellar mass ~2x10^7Msun, exceeding the total mass of all dense GCs in our Galaxy. We find that, in order to reproduce the empirically derived formation rate of low-mass X-ray binaries (LMXBs), we must assume that NSs can be formed via electron-capture supernovae (ECS) with typical natal kicks smaller than in core-collapse supernovae. Our results explain the observed dependence of the number of LMXBs on ``collision number'' as well as the large scatter observed between different GCs. We predict that the number of quiescent LMXBs in different GCs should not have a strong metallicity dependence. In our cluster model the following mass-gaining events create populations of MSPs that do not match the observations: (i) accretion during a common envelope event with a NS formed through ECS, and (ii) mass transfer (MT) from a WD donor. Some processes lead only to a mild recycling. In addition, for MSPs, we distinguish low-magnetic-field (long-lived) and high-magnetic-field (short-lived) populations. With this distinction and by considering only those mass-gaining events that appear to lead to NS recycling, we obtain good agreement of our models with the numbers and characteristics of observed MSPs in 47 Tuc and Terzan 5, as well as with the cumulative statistics for MSPs detected in GCs of different dynamical properties. We find that significant production of merging double NSs potentially detectable as short gamma-ray bursts occurs only in very dense, most likely core-collapsed GCs. (abridged)
description: 25 pages, 7 figures, 12 tables, MNRAS accepted
Multiorder, Kleene stars and cyclic projectors in the geometry of max cones
Creators: name: Sergeev, Sergei
Publisher: name: arXiv
Year: 2008
Subjects: subject: Metric Geometry (math.MG)
subject: FOS: Mathematics
subject: 15A48, 52B11, 52A20, 06F15

description: This paper summarizes results on some topics in the max-plus convex geometry, mainly concerning the role of multiorder, Kleene stars and cyclic projectors, and relates them to some topics in max algebra. The multiorder principle leads to max-plus analogues of some statements in the finite-dimensional convex geometry and is related to the set covering conditions in max algebra. Kleene stars are fundamental for max algebra, as they accumulate the weights of optimal paths and describe the eigenspace of a matrix. On the other hand, the approach of tropical convexity decomposes a finitely generated semimodule into a number of convex regions, and these regions are column spans of uniquely defined Kleene stars. Another recent geometric result, that several semimodules with zero intersection can be separated from each other by max-plus halfspaces, leads to investigation of specific nonlinear operators called cyclic projectors. These nonlinear operators can be used to find a solution to homogeneous multi-sided systems of max-linear equations. The results are presented in the setting of max cones, i.e., semimodules over the max-times semiring.
description: 26 pages, a minor revision
Fröhlich Polarons from 0D to 3D: Concepts and Recent Developments
Creators: name: Devreese, J. T.
Publisher: name: arXiv
Year: 2007
Subjects: subject: Mesoscale and Nanoscale Physics (cond-mat.mes-hall)
subject: FOS: Physical sciences

description: I analyse our present understanding of the Froehlich polaron with emphasis on the response properties, in particular optical absorption.
description: 28 pages, 17 figures, invited lecture at the ESF Exploratory Workshop EW05-105 "Mott's Physics in Nanowires and Quantum Dots", University of Cambridge, United Kingdom, 31 July - 2 August 2006
Pressure-temperature Phase Diagram of Polycrystalline UCoGe Studied by Resistivity Measurement
Creators: name: Hassinger, Elena
name: Aoki, Dai
name: Knebel, Georg
name: Flouquet, Jacques
Publisher: name: arXiv
Year: 2008
Subjects: subject: Strongly Correlated Electrons (cond-mat.str-el)
subject: Superconductivity (cond-mat.supr-con)
subject: FOS: Physical sciences

description: Recently, coexistence of ferromagnetism (T_Curie = 2.8K) and superconductivity (T_sc = 0.8K) has been reported in UCoGe, a compound close to a ferromagnetic instability at ambient pressure P. Here we present resistivity measurements under pressure on a UCoGe polycrystal. The phase diagram obtained from resistivity measurements on a polycrystalline sample is found to be qualitatively different to those of all other ferromagnetic superconductors. By applying high pressure, ferromagnetism is suppressed at a rate of 1.4 K/GPa. No indication of ferromagnetic order has been observed above P ~ 1GPa. The resistive superconducting transition is, however, quite stable in temperature and persists up to the highest measured pressure of about 2.4GPa. Superconductivity would therefore appear also in the paramagnetic phase. However, the appearance of superconductivity seems to change at a characteristic pressure P* ~ 0.8GPa. Close to a ferromagnetic instability, the homogeneity of the sample can influence strongly the electronic and magnetic properties and therefore bulk phase transitions may differ from the determination by resistivity measurements.
description: 4 pages, 4 figures, submitted to J. Phys. Soc. Jpn
Polarized superfluids near their tricritical point
Creators: name: Sheehy, Daniel E.
Publisher: name: arXiv
Year: 2008
Subjects: subject: Superconductivity (cond-mat.supr-con)
subject: FOS: Physical sciences

description: We obtain a variety of predictions for the properties of population-imbalanced (or polarized) fermionic superfluids near their tricritical point. In the vicinity of the high-symmetry tricritical point, observable quantities such as the cloud shape, heat capacity, and local polarization should exhibit distinct behavior arising from the tricritical scaling laws, as well as logarithmic corrections to scaling reflecting the marginal nature of interactions.
description: 8 pages, 3 figures. Expanded version accepted in PRA
Equivariant path fields on topological manifolds
Creators: name: Borsari, Lucilia
name: Cardona, Fernanda
name: Wong, Peter
Publisher: name: arXiv
Year: 2007
Subjects: subject: Algebraic Topology (math.AT)
subject: FOS: Mathematics
subject: 55M20, 57S99

description: A classical theorem of H. Hopf asserts that a closed connected smooth manifold admits a nowhere vanishing vector field if and only if its Euler characteristic is zero. R. Brown generalized Hopf's result to topological manifolds, replacing vector fields with path fields. In this note, we give an equivariant analog of Brown's theorem for locally smooth $G$-manifolds where $G$ is a finite group.
description: 17 pages, 6 figures
Bohmian approach to spin-dependent time of arrival for particles in a uniform field and for particles passing through a barrier
Creators: name: Mousavi, S. V.
name: Golshani, M.
Publisher: name: arXiv
Year: 2008
Subjects: subject: Quantum Physics (quant-ph)
subject: FOS: Physical sciences

description: It is known that Lorentz covariance fixes uniquely the current and the associated guidance law in the trajectory interpretation of quantum mechanics for spin-1/2 particles. In the nonrelativistic domain this implies a guidance law for electrons which differs by an additional spin-dependent term from the one originally proposed by de Broglie and Bohm. Although the additional term in the guidance equation may not be detectable in the quantum measurements derived solely from the probability density $ρ$, it plays a role in the case of arrival-time measurements. In this paper we compute the arrival time distribution and the mean arrival time at a given location, with and without the spin contribution, for two problems: 1) a symmetrical Gaussian packet in a uniform field and 2) a symmetrical Gaussian packet passing through a 1D barrier. Using the Runge-Kutta method for integration of the guidance law, Bohmian paths of these problems are also computed.
A superconductor with 4-fermion attraction perturbed by magnetic impurities
Creators: name: Borycki, Dawid
Publisher: name: arXiv
Year: 2007
Subjects: subject: Superconductivity (cond-mat.supr-con)
subject: FOS: Physical sciences

description: A superconductor with 4-fermion attraction, considered by Maćkowiak and Tarasewicz is modified by adding to the Hamiltonian a long-range magnetic interaction $V$ between conduction fermions and localized distinguishable spin 1/2 magnetic impurities. $V$ has the form of a reduced s-d interaction. An upper and lower bound to the system's free energy density $f(H,β)$ is derived and the two bounds are shown to coalesce in the thermodynamic limit. The resulting mean-field equations for the gap $Δ$ and a parameter $y$, characterizing the impurity subsystem are solved and the solution minimizing $f$ is found for various values of magnetic coupling constant $g$ and impurity concentration. The phase diagrams of the system are depicted with five distinct phases: the normal phase, unperturbed superconducting phase, perturbed superconducting phase with nonzero gap in the excitation spectrum, perturbed gapless superconducting phase and impurity phase with completely suppressed superconductivity.
description: 21 pages, 3 figures
On the Conformal Field Theories for Bosonic Strings in PP-Waves
Creators: name: Mukhopadhyay, Partha
Publisher: name: arXiv
Year: 2008
Subjects: subject: High Energy Physics - Theory (hep-th)
subject: FOS: Physical sciences

description: Recently Kazama and Yokoi (arXiv:0801.1561 [hep-th]) have used a phase-space method to study the Virasoro algebra of type IIB superstring theory in the maximally supersymmetric R-R plane wave background in a semi-light-cone gauge. Two types of normal ordering have been considered, namely "phase space normal ordering" (PNO) and "massless normal ordering" (MNO). The second one, which is the right one to choose in flat background, has been discarded with the argument that the Virasoro algebra closes only in the first case. To understand this issue better with a completely covariant treatment we consider the easiest case of bosonic strings propagating in an arbitrary pp-wave of the simplest kind. Using the phase-space method we show that MNO is in fact the right one to choose because of the following reason. For both types of normal ordering the energy-momentum tensor satisfies the desired Virasoro algebra up to anomalous terms proportional to the space-time equation of motion of the background. However, it is MNO which gives rise to the correct spectrum - we compute the quadratic space-time action by restricting the string field inside a transverse Hilbert space. This turns out to be non-diagonal. Diagonalizing this action reproduces the spectrum directly obtained in light-cone quantization. The same method with PNO gives rise to a spectrum with negative dimensions.
description: 19 pages
Colloids dragged through a polymer solution: experiment, theory and simulation
Creators: name: Gutsche, Christof
name: Kremer, Friedrich
name: Krüger, Matthias
name: Rauscher, Markus
name: Weeber, Rudolf
name: Harting, Jens
Publisher: name: arXiv
Year: 2007
Subjects: subject: Soft Condensed Matter (cond-mat.soft)
subject: FOS: Physical sciences

description: We present micro-rheological measurments of the drag force on colloids pulled through a solution of lambda-DNA (used here as a monodisperse model polymer) with an optical tweezer. The experiments show a violation of the Stokes-Einstein relation based on the independently measured viscosity of the DNA solution: the drag force is larger than expected. We attribute this to the accumulation of DNA infront of the colloid and the reduced DNA density behind the colloid. This hypothesis is corroborated by a simple drift-diffusion model for the DNA molecules, which reproduces the experimental data surprisingly well, as well as by corresponding Brownian dynamics simulations.
description: 9 pages, 13 figures, 3 tables
Clustering environment of BL Lac object RGB 1745+398
Creators: name: Lietzen, H.
name: Nilsson, K.
name: Takalo, L. O.
name: Heinamaki, P.
name: Nurmi, P.
name: Keinanen, P.
name: Wagner, S.
Publisher: name: arXiv
Year: 2008
Subjects: subject: Astrophysics (astro-ph)
subject: FOS: Physical sciences

description: The BL Lac object RGB 1745+398 lies in an environment that makes it possible to study the cluster around it more deeply than the environments of other BL Lac objects. The cluster centered on the BL Lac works as a strong gravitational lens, forming a large arc around itself. The aim of this paper is to study the environment and characteristics of this object more accurately than the environments of other BL Lac objects have been before.We measured the redshifts of galaxies in the cluster from the absorption lines in their spectra. The velocity dispersion was then obtained from the redshifts. The gravitational lensing was used for measuring the mass at the center of the cluster. The mass of the whole cluster could then be estimated using the softened isothermal sphere mass distribution. Finally, the richness of the cluster was determined by counting the number of galaxies near the BL Lac object and obtaining the galaxy-BL Lac spatial covariance function, $B_{gb}$. The redshifts of nine galaxies in the field were measured to be near the redshift of the BL Lac object, confirming the presence of a cluster. The average redshift of the cluster is 0.268, and the velocity dispersion $(470^{+190}_{-110})$ km s$^{-1}$. The mass of the cluster is $M_{500}=(4^{+3}_{-2})\times10^{14} M_{\sun}$ which implies a rather massive cluster. The richness measurement also suggests that this is a rich cluster: the result for covariance function is $B_{gb}=(600\pm200)$ Mpc$^{1.77}$, which corresponds to Abell richness class 1 and which is consistent with the mass and velocity dispersion of the cluster.
description: 5 pages, accepted to A&A