cometadata/datacite-rtg-text-other-reclassification-records huggingface dataset:
Rapid measurement of the local pressure amplitude in microchannel acoustophoresis using motile cells
Creators: name: Kim, Minji
name: Barnkob, Rune
name: Meacham, J. Mark
Publisher: name: arXiv
Year: 2021
Subjects: subject: Applied Physics (physics.app-ph)
subject: Fluid Dynamics (physics.flu-dyn)
subject: FOS: Physical sciences

description: Acoustic microfluidics (or acoustofluidics) provides a non-contact and label-free means to manipulate and interrogate bioparticles. Owing to their biocompatibility and precision, acoustofluidic approaches have enabled innovations in various areas of biomedical research. Future breakthroughs will rely on translation of these techniques from academic labs to clinical and industrial settings. Here, accurate characterization and standardization of device performance is crucial. Versatile, rapid, and widely accessible performance quantification is needed. We propose a field quantification method using motile Chlamydomonas reinhardtii algae cells. We previously reported qualitative mapping of acoustic fields using living microswimmers as active probes. In the present study, we extend our approach to achieve the challenging quantitative in situ measurement of the acoustic energy density. C. reinhardtii cells continuously swim in an imposed force field and dynamically redistribute as the field changes. This behavior allows accurate and complete, real-time performance monitoring, which can be easily applied and adopted within the acoustofluidics and broader microfluidics research communities. Additionally, the approach relies only on standard bright-field microscopy to assess the field under numerous conditions within minutes. We benchmark the method against conventional passive-particle tracking, achieving agreement within 1 % for field strengths from 0 to 100 J m-3 (0 to ~1 MPa).
description: 18 pages, 7 figures, submitted to Journal of the Acoustical Society of America (J Acoust Soc Am)
Measuring Column Densities in Quasar Outflows: VLT Observations of QSO 2359-1241
Creators: name: Arav, Nahum
name: Moe, Maxwell
name: Costantini, Elisa
name: Korista, Kirk T.
name: Benn, Chris
name: Ellison, Sara
Publisher: name: arXiv
Year: 2008
Subjects: subject: Astrophysics (astro-ph)
subject: FOS: Physical sciences

description: We present high resolution spectroscopic VLT observations of the outflow seen in QSO 2359-1241. These data contain absorption troughs from five resonance Fe II lines with a resolution of ~7 km/s and signal-to-noise ratio per resolution element of order 100. We use this unprecedented high quality data set to investigate the physical distribution of the material in front of the source, and by that determine the column densities of the absorbed troughs. We find that the apparent optical depth model gives a very poor fit to the data and greatly underestimates the column density measurements. Power-law distributions and partial covering models give much better fits with some advantage to power-law models, while both models yield similar column density estimates. The better fit of the power-law model solves a long standing problem plaguing the partial covering model when applied to large distance scale outflow: How to obtain a velocity dependent covering factor for an outflow situated at distances thousands of time greater than the size of the AGN emission source. This problem does not affect power-law models. Therefore, based on the better fit and plausibility of the physical model, we conclude that in QSO 2359-1241, the outflow covers the full extent of the emission source but in a non-homogeneous way.
description: 27 pages, 6 figures, to appear on ApJ Jul 10. The full (online) version of figure 2 can be obtained here: http://www.phys.vt.edu/~arav/f2_online_version.ps
Population dynamics in the triplet annihilation model with a mutating reproduction rate
Creators: name: Dickman, Ronald
Publisher: name: arXiv
Year: 2021
Subjects: subject: Statistical Mechanics (cond-mat.stat-mech)
subject: FOS: Physical sciences

description: I study a population model in which the reproduction rate lambda is inherited with mutation, favoring fast reproducers in the short term, but conflicting with a process that eliminates agglomerations of individuals. The model is a variant of the triplet annihilation model introduced several decades ago [R. Dickman, Phys. Rev. B~{\bf 40}, 7005 (1989)] in which organisms ("particles") reproduce and diffuse on a lattice, subject to annihilation when (and only when) occupying three consecutive sites. For diffusion rates below a certain value, the population possesses two "survival strategies": (i) rare reproduction (0 < lambda < lambda_{c,1}), in which a low density of diffusing particles renders triplets exceedingly rare, and (ii) frequent reproduction (lambda > lambda_{c,2}). For lambda between lambda_{c,1} and lambda_{c,2} there is no active steady state. In the rare-reproduction regime, a mutating $λ$ leads to stochastic boom-and-bust cycles in which the reproduction rate fluctuates upward in certain regions, only to lead to extinction as the local value of lambda becomes excessive. The global population can nevertheless survive due to the presence of other regions, with reproduction rates that have yet to drift upward.
description: 15 pages, 9 figures, to appear in Physica A, Special issue in memory of D. Stauffer
Additional file 3 of Exploring the associations between transcript levels and fluxes in constraint-based models of metabolism
Creators: name: Sinha, Neeraj
name: van Schothorst, Evert M.
name: Hooiveld, Guido J. E. J.
name: Keijer, Jaap
name: Martins dos Santos, Vitor A. P.
name: Suarez-Diez, Maria
Publisher: name: figshare
Year: 2021
Subjects: subject: Genetics
subject: FOS: Biological sciences
subject: Molecular Biology
subject: Science Policy
subject: 69999 Biological Sciences not elsewhere classified
subject: 80699 Information Systems not elsewhere classified
subject: FOS: Computer and information sciences
subject: 19999 Mathematical Sciences not elsewhere classified
subject: FOS: Mathematics
subject: Cancer

description: Additional file 3: Figure S2. Exploration of impact of proportionality constant on predicted flux in glycerol carbon source in E.coli (Gerosa dataset): (A) Fumarate secretion (B) Acetate uptake/secretion (C) Fructose uptake (D) Glycerol uptake (E) Glucose uptake (F) Galactose uptake (G) Gluconate uptake (H) Pyruvate uptake (I) Succinate uptake (J) Lactate secretion (K) PGI{Glucose-6-phosphate isomerase} (L) PFK{Phosphofructokinase} (M) FBA{Fructose-bisphosphate aldolase} (N) PDH{ Pyruvate dehydrogenase} (O) TPI{ Triose-phosphate isomerase} (P) RPI{ Ribose-5-phosphate isomerase} (Q) RPE{ Ribulose 5-phosphate 3-epimerase} (R) TKT2{ Transketolase} (S) PPC{ Phosphoenolpyruvate carboxylase} (T) PPCK{ Phosphoenolpyruvate carboxy kinase} (U) FUM{ Fumarate}. Simulations of internal and external flux was done by fixing the fitted values followed by sampling of the solution space. The error bars indicate the standard deviations.
New congruences for central binomial coefficients
Creators: name: Sun, Zhi-Wei
name: Tauraso, Roberto
Publisher: name: arXiv
Year: 2008
Subjects: subject: Number Theory (math.NT)
subject: Combinatorics (math.CO)
subject: FOS: Mathematics
subject: 11B65; 05A10; 05A19; 11A07; 11B39; 11B68

description: Let p be a prime and let a be a positive integer. In this paper we determine $\sum_{k=0}^{p^a-1}\binom{2k}{k+d}/m^k$ and $\sum_{k=1}^{p-1}\binom{2k}{k+d}/(km^{k-1})$ modulo $p$ for all d=0,...,p^a, where m is any integer not divisible by p. For example, we show that if $p\not=2,5$ then $$\sum_{k=1}^{p-1}(-1)^k\frac{\binom{2k}k}k=-5\frac{F_{p-(\frac p5)}}p (mod p),$$ where F_n is the n-th Fibonacci number and (-) is the Jacobi symbol. We also prove that if p>3 then $$\sum_{k=1}^{p-1}\frac{\binom{2k}k}k={8/9} p^2B_{p-3} (mod p^3),$$ where B_n denotes the n-th Bernoulli number.
Point spread function tails and the measurements of diffuse stellar halo light around edge-on disc galaxies
Creators: name: de Jong, Roelof S.
Publisher: name: arXiv
Year: 2008
Subjects: subject: Astrophysics (astro-ph)
subject: FOS: Physical sciences

description: Measuring the integrated stellar halo light around galaxies is very challenging. The surface brightness of these haloes are expected to be many magnitudes below dark sky and the central brightness of the galaxy. Here I show that in some of the recent literature the effect of very extended Point Spread Function (PSF) tails on the measurements of halo light has been underestimated; especially in the case of edge-on disc galaxies. The detection of a halo along the minor axis of an edge-on galaxy in the Hubble Ultra Deep Field can largely be explained by scattered galaxy light. Similarly, depending on filter and the shape one assumes for the uncertain extended PSF, 20 to 80 per cent of the halo light found along the minor axis of scaled and stacked Sloan Digital Sky Survey (SDSS) edge-on galaxy images can be explained by scattered galaxy light. Scattered light also significantly contributes to the anomalous halo colours of stacked SDSS images. The scattered light fraction decreases when looking in the quadrants away from the minor axis. The remaining excess light is well modelled with a Sersic profile halo with shape parameters based on star count halo detections of nearby galaxies. Even though the contribution from PSF scattered light does not fully remove the need for extended components around these edge-on galaxies, it will be very challenging to make accurate halo light shape and colour measurements from integrated light without very careful PSF measurements and scattered light modelling.
description: Ten pages, 6 figures. MNRAS, in press
Mixture of orthogonal sequences made from extended time-stretched pulses enables measurement of involuntary voice fundamental frequency response to pitch perturbation
Creators: name: Kawahara, Hideki
name: Matsui, Toshie
name: Yatabe, Kohei
name: Sakakibara, Ken-Ichi
name: Tsuzaki, Minoru
name: Morise, Masanori
name: Irino, Toshio
Publisher: name: arXiv
Year: 2021
Subjects: subject: Sound (cs.SD)
subject: Audio and Speech Processing (eess.AS)
subject: Signal Processing (eess.SP)
subject: FOS: Computer and information sciences
subject: FOS: Electrical engineering, electronic engineering, information engineering
subject: 92C55

description: Auditory feedback plays an essential role in the regulation of the fundamental frequency of voiced sounds. The fundamental frequency also responds to auditory stimulation other than the speaker's voice. We propose to use this response of the fundamental frequency of sustained vowels to frequency-modulated test signals for investigating involuntary control of voice pitch. This involuntary response is difficult to identify and isolate by the conventional paradigm, which uses step-shaped pitch perturbation. We recently developed a versatile measurement method using a mixture of orthogonal sequences made from a set of extended time-stretched pulses (TSP). In this article, we extended our approach and designed a set of test signals using the mixture to modulate the fundamental frequency of artificial signals. For testing the response, the experimenter presents the modulated signal aurally while the subject is voicing sustained vowels. We developed a tool for conducting this test quickly and interactively. We make the tool available as an open-source and also provide executable GUI-based applications. Preliminary tests revealed that the proposed method consistently provides compensatory responses with about 100 ms latency, representing involuntary control. Finally, we discuss future applications of the proposed method for objective and non-invasive auditory response measurements.
description: 5 pages, 9 figures, submitted to Interspeech2021
Przemysław Hauser, Śląsk między Polską, Czechosłowację i separatyzmen. Walka Niemiec o utrzymanie prowincji śląskiej w latach 1918-1919
Creators: name: Bamberger-Stemmann, Sabine
Publisher: name: Zeitschrift für Ostmitteleuropa-Forschung
Year: 1995

description: Zeitschrift für Ostmitteleuropa-Forschung, Bd. 44 Nr. 3 (1995)
Stream channel stability in the Queen Charlotte Islands : an examination of Schumm’s fluvial model
Creators: name: Roberts, Richard Graham
Publisher: name: University of British Columbia
Year: 2010

description: Based upon investigations of ephemeral, sand-bed streams in semi-arid areas, Schumm (1977) proposed a model of the fluvial system in which long periods of relative stability are separated by brief episodes of major morphologic change (termed "dynamic metastable equilibrium"). The latter constitute "episodic behaviour" and are initiated when the system crosses a "geomorphic threshold". The resultant sediment transport-limited conditions may induce a series of progressively damped cut-and-fill cycles, which Schumm termed "complex response". In this study, the stability of perennial, gravel-bed streams in the per-humid Queen Charlotte Islands was investigated, in order to test Schumm's fluvial model in a strongly contrasting environment. Compared with semi-arid stream systems, forest streams in the Queen Charlotte Islands are less sensitive, and exhibit greater resilience, to major hydrologic events. In general, a condition of sediment supply-limitation and "dynamic equilibrium" probably has prevailed in forested watersheds throughout the past 8,000 years. Schumm's model is overly elaborate in such situations. However, the behaviour of four stream systems in the Queen Charlotte Islands, whose sensitivity was increased by streamside logging activities, approaches that of semi-arid stream systems in certain respects. The land-use change crossed an "extrinsic geomorphic threshold", lowered an "intrinsic geomorphic threshold" (stream bank stability), and generated major episodes of channel widening and the development of aggradational "sediment wedges". This is consistent with Schumm's definition of "episodic behaviour". However, the occurrence of only one cycle of aggradation and degradation at any one cross-section is not compatible with the concept of "complex response". A simple, or Mackin-type, adjustment at "grade" is proposed as a more suitable description of the heavily damped relaxation pattern of "sediment wedge" movements; this response is promoted by the propensity of gravels to "armour", and alders to revegetate these deposits, and thereby inhibit their entrainment. "Sediment wedges" represent the most notable example of fluvial disequilibrium to have occurred in the Queen Charlotte Islands during the past 8,000 years which complies with the concept of "dynamic metastable equilibrium". But it is anticipated that these creeks will return to their pre-disturbance condition of "dynamic equilibrium" due to the operation of stream channel recovery processes.
Realization and application of a 111 million pixel backside-illuminated detector and camera
Creators: name: Zacharias, Norbert
name: Dorland, Bryan
name: Bredthauer, Richard
name: Boggs, Kasey
name: Bredthauer, Greg
name: Lesser, Mike
Publisher: name: arXiv
Year: 2007
Subjects: subject: Astrophysics (astro-ph)
subject: FOS: Physical sciences

description: A full-wafer, 10,580 $\times$ 10,560 pixel (95 $\times$ 95 mm) CCD was designed and tested at Semiconductor Technology Associates (STA) with 9 um square pixels and 16 outputs. The chip was successfully fabricated in 2006 at DALSA and some performance results are presented here. This program was funded by the Office of Naval Research through a Small Business Innovation in Research (SBIR) program requested by the U.S. Naval Observatory for its next generation astrometric sky survey programs. Using Leach electronics, low read-noise output of the 111 million pixels requires 16 seconds at 0.9 MHz. Alternative electronics developed at STA allow readout at 20 MHz. Some modifications of the design to include anti-blooming features, a larger number of outputs, and use of p-channel material for space applications are discussed.
description: 8 pages, 5 figures, accepted for SPIE conference 6690
Daily Observations of Interstellar Scintillation in PSR B0329+54
Creators: name: Wang, N.
name: Yan, Z.
name: Manchester, R. N.
name: Wang, H. X.
Publisher: name: arXiv
Year: 2007
Subjects: subject: Astrophysics (astro-ph)
subject: FOS: Physical sciences

description: Quasi-continuous observations of PSR B03239+54 over 20 days using the Nanshan 25-m telescope at 1540 MHz have been used to study the effects of refractive scintillation on the pulsar flux density and diffractive scintillation properties. Dynamic spectra were obtained from datasets of 90 min duration and diffractive parameters derived from a two-dimensional auto-correlation analysis. Secondary spectra were also computed but these showed no significant evidence for arc structure. Cross correlations between variations in the derived parameters were much lower than predicted by thin screen models and in one case was of opposite sign to the prediction. Observed modulation indices were larger than predicted by thin screen models with a Kolmogorov fluctuation spectrum. Structure functions were computed for the flux density, diffractive timescale and decorrelation bandwidth. These indicated a refractive timescale of $8\pm 2$ h, much shorter than predicted by the thin screen model. The measured structure-function slope of $0.4\pm 0.2$ is also inconsistent with scattering by a single thin screen for which a slope of 2.0 is expected. All observations are consistent with scattering by an extended medium having a Kolmogorov fluctuation spectrum which is concentrated towards the pulsar. This interpretation is also consistent with recent observations of multiple diffuse scintillation arcs for this pulsar.
description: 10 pages, 5 figures, Accepted by MNRAS
$Λ_c \to Λ$ Form Factors in Lattice QCD
Creators: name: Bahtiyar, Huseyin
Publisher: name: arXiv
Year: 2021
Subjects: subject: High Energy Physics - Lattice (hep-lat)
subject: High Energy Physics - Phenomenology (hep-ph)
subject: FOS: Physical sciences

description: Studying the semileptonic decays of charmed particles is prominent in testing the standard model of particle physics. Motivated by recent experimental progress in weak decays of the charm baryon sector, we study the form factors of $Λ_c \to Λ\ell^+ ν$ transition on two flavor lattices. We compute two- and three-point functions, extract the dimensionless projected correlators, and combine them to form the Weinberg form factors. In the zero transferred momentum limit $f_1$, $f_2$ and $g_1$ form factors are found to be in agreement with other models, furthermore $f_3$ and $g_3$ form factors are comparable to model determinations. The $g_2$ form factor, on the other hand, is found to be mildly larger. We also evaluate the helicity form factors, which is consistent with the previous lattice studies.
description: 10 pages, 5 figures
Additional file 4 of Exploring the associations between transcript levels and fluxes in constraint-based models of metabolism
Creators: name: Sinha, Neeraj
name: van Schothorst, Evert M.
name: Hooiveld, Guido J. E. J.
name: Keijer, Jaap
name: Martins dos Santos, Vitor A. P.
name: Suarez-Diez, Maria
Publisher: name: figshare
Year: 2021
Subjects: subject: Genetics
subject: FOS: Biological sciences
subject: Molecular Biology
subject: Science Policy
subject: 69999 Biological Sciences not elsewhere classified
subject: 80699 Information Systems not elsewhere classified
subject: FOS: Computer and information sciences
subject: 19999 Mathematical Sciences not elsewhere classified
subject: FOS: Mathematics
subject: Cancer

description: Additional file 4: Figure S3 Exploration of impact of proportionality constant on predicted flux in anaerobic and aerobic in S. cerevisiae: (A) Acetate aerobic (B) Acetate anaerobic (C) Glycerol aerobic (D) Glycerol anaerobic
Spacetime symmetries and the qubit Bloch ball: a physical derivation of finite dimensional quantum theory and the number of spatial dimensions
Creators: name: Pitalúa-García, Damián
Publisher: name: arXiv
Year: 2021
Subjects: subject: Quantum Physics (quant-ph)
subject: General Relativity and Quantum Cosmology (gr-qc)
subject: FOS: Physical sciences

description: Quantum theory and relativity are the pillar theories on which our understanding of physics is based. Poincaré invariance is a fundamental physical principle stating that the experimental results must be the same in all inertial reference frames in Minkowski spacetime. It is a basic condition imposed on quantum theory in order to construct quantum field theories, hence, it plays a fundamental role in the standard model of particle physics too. As is well known, Minkowski spacetime follows from clear physical principles, like the relativity principle and the invariance of the speed of light. Here, we reproduce such a derivation, but leave the number of spatial dimensions $n$ as a free variable. Then, assuming that spacetime is Minkowski in $1+n$ dimensions and within the framework of general probabilistic theories, we reconstruct the qubit Bloch ball and finite dimensional quantum theory, and obtain that the number of spatial dimensions must be $n=3$, from Poincaré invariance and other physical postulates. Our results suggest a fundamental physical connection between spacetime and quantum theory.
description: Accepted manuscript. To appear in Physical Review A
Physical Conditions in Quasar Outflows: VLT Observations of QSO 2359-1241
Creators: name: Korista, Kirk
name: Bautista, Manuel
name: Arav, Nahum
name: Moe, Maxwell
name: Costantini, Elisa
name: Benn, Chris
Publisher: name: arXiv
Year: 2008
Subjects: subject: Astrophysics (astro-ph)
subject: FOS: Physical sciences

description: We analyze the physical conditions of the outflow seen in QSO 2359-1241 (NVSS J235953-124148), based on high resolution spectroscopic VLT observations. This object was previously studied using Keck/HIRES data. The main improvement over the HIRES results is our ability to accurately determine the number density of the outflow. For the major absorption component, level population from five different Fe II excited level yields n_H=10^4.4 cm^-3 with less than 20% scatter. We find that the Fe ii absorption arises from a region with roughly constant conditions and temperature greater than 9000 K, before the ionization front where temperature and electron density drop. Further, we model the observed spectra and investigate the effects of varying gas metalicities and the spectral energy distribution of the incident ionizing radiation field. The accurately measured column densities allow us to determine the ionization parameter log(U) = -2.4 and total column density of the outflow (log(N_H) = 20.6 cm^-2). Combined with the number density finding, these are stepping stones towards determining the mass flux and kinetic luminosity of the outflow, and therefore its importance to AGN feedback processes.
description: 21 pages, 3 figures (accepted for publication in the ApJ)
Addressable metasurfaces for dynamic holography and optical information encryption
Creators: name: Li, Jianxiong
name: Kamin, Simon
name: Zheng, Guoxing
name: Neubrech, Frank
name: Zhang, Shuang
name: Liu, Na
Publisher: name: arXiv
Year: 2021
Subjects: subject: Optics (physics.optics)
subject: Applied Physics (physics.app-ph)
subject: FOS: Physical sciences

description: Metasurfaces enable manipulation of light propagation at an unprecedented level, benefitting from a number of merits unavailable to conventional optical elements, such as ultracompactness, precise phase and polarization control at deep subwavelength scale, and multifunctionalities. Recent progress in this field has witnessed a plethora of functional metasurfaces, ranging from lenses and vortex beam generation to holography. However, research endeavors have been mainly devoted to static devices, exploiting only a glimpse of opportunities that metasurfaces can offer. We demonstrate a dynamic metasurface platform, which allows independent manipulation of addressable subwavelength pixels at visible frequencies through controlled chemical reactions. In particular, we create dynamic metasurface holograms for advanced optical information processing and encryption. Plasmonic nanorods tailored to exhibit hierarchical reaction kinetics upon hydrogenation/dehydrogenation constitute addressable pixels in multiplexed metasurfaces. The helicity of light, hydrogen, oxygen, and reaction duration serve as multiple keys to encrypt the metasurfaces. One single metasurface can be deciphered into manifold messages with customized keys, featuring a compact data storage scheme as well as a high level of information security. Our work suggests a novel route to protect and transmit classified data, where highly restricted access of information is imposed.
Self-recording and manipulation of fast long-range hydrogen diffusion in quasifree magnesium
Creators: name: Duan, Xiaoyang
name: Griessen, Ronald
name: Wijngaarden, Rinke J.
name: Kamin, Simon
name: Liu, Na
Publisher: name: arXiv
Year: 2021
Subjects: subject: Applied Physics (physics.app-ph)
subject: FOS: Physical sciences

description: Understanding diffusion of large solutes such as hydrogen and lithium in solids is of paramount importance for energy storage in metal hydrides and advanced batteries. Due to its high gravimetric and volumetric densities, magnesium is a material of great potential for solid-state hydrogen storage. However, the slow hydrogen diffusion kinetics and the deleterious blocking effect in magnesium have hampered its practical applications. Here, we demonstrate fast lateral hydrogen diffusion in quasifree magnesium films without the blocking effect. Massive concomitant lattice expansion leads to the formation of remarkable self-organized finger patterns extending over tens of micrometers. Detailed visualization of diffusion fronts reveals that the fingers in these patterns follow locally the direction of hydrogen diffusion. Thus, the streamlines of the diffusion process are self-recorded by means of the finger pattern. By inclusion of fast hydrogen diffusion objects or local gaps, the resulting streamlines exhibit a clear analogy to optical rays in geometric optics. The possibility to spatially manipulate hydrogen diffusion opens an avenue to build advanced hydrogen storage systems, cloaking and active plasmonic devices, as well as prototype systems for computational models.
Incoherent mid-infrared charge excitation and the high energy anomaly in the photoemission spectra of cuprates
Creators: name: Cojocaru, S.
name: Citro, R.
name: Marinaro, M.
Publisher: name: arXiv
Year: 2007
Subjects: subject: Materials Science (cond-mat.mtrl-sci)
subject: FOS: Physical sciences

description: On the basis of a semi-phenomenological model, it is argued that the high energy anomaly observed in recent photoemission experiments on cuprates is caused by interaction with an overdamped bosonic mode in the mid-infrared region of the spectrum. Analysis of optical conductivity allows to connect this excitation to the incoherent charge response reported for the majority of high Tc materials and some other perovskites. We show that its large damping is an essential feature responsible for the "waterfall" dispersion and linewidth of the spectral weight.
description: 12 pages, 3 figures
Stysaptera ikalalao Heiss 1999
Creators: name: Heiss, Ernst
Publisher: name: Zenodo
Year: 2012
Subjects: Biodiversity
Taxonomy
Animalia
Arthropoda
Insecta
Hemiptera
Aradidae
Stysaptera
Stysaptera ikalalao

description: Stysaptera ikalalao Heiss, 1999
Stysaptera ikalalao Heiss, 1999: 88. HT 3: Madagascar (Ile St. Marie [Nosy Boraha]); CEHI. Distr.: Madagascar
Ref.: Heiss, 1999 (fig., gen.)
description: Published as part of Heiss, Ernst, 2012, Annotated catalogue of the flat bug family Aradidae Brullé, 1836 of Madagascar and adjacent islands (Hemiptera: Heteroptera), pp. 45-63 in Zootaxa 3426 (1) on page 50, DOI: 10.11646/zootaxa.3426.1.3, http://zenodo.org/record/214110
Additional file 1 of Adult retrospective report of child abuse and prospective indicators of childhood harm: a population birth cohort study
Creators: name: Pinto Pereira, Snehal M.
name: Rogers, Nina T.
name: Power, Christine
Publisher: name: figshare
Year: 2021
Subjects: subject: Medicine
subject: Neuroscience
subject: Sociology
subject: FOS: Sociology
subject: Cancer
subject: Science Policy
subject: 111714 Mental Health
subject: FOS: Health sciences

description: Additional file 1: Tables S1-3. additional supplementary data.
Scanning Plasmonic Color Display
Creators: name: Duan, Xiaoyang
name: Liu, Na
Publisher: name: arXiv
Year: 2021
Subjects: subject: Applied Physics (physics.app-ph)
subject: Optics (physics.optics)
subject: FOS: Physical sciences

description: Control over plasmonic colors on the nanoscale is of great interest for high-resolution display, imaging, and information encryption applications. However, so far, very limited schemes have been attempted for dynamic plasmonic color generation. In this paper, we demonstrate a scanning plasmonic color generation scheme, in which subwavelength plasmonic pixels can be laterally switched on/off through directional hydrogenation/dehydrogenation of a magnesium screen. We show several dynamic plasmonic color displays with different scanning functions by varying the number and geometries of the palladium gates, where hydrogen enters the scanning screens. In particular, we employ the scanning effects to create a dynamic plasmonic quick response code. The information cannot be decrypted by varying the polarization states of light or by accessing the physical features. Rather, it can only be read out using hydrogen as a decoding key. Our work advances the established design concepts for plasmonic color printing and provides insights into the development of optical information storage and anticounterfeiting features.
WMAP 5-year constraints on fnl with wavelets
Creators: name: Curto, A.
name: Martinez-Gonzalez, E.
name: Mukherjee, P.
name: Barreiro, R. B.
name: Hansen, F. K.
name: Liguori, M.
name: Matarrese, S.
Publisher: name: arXiv
Year: 2008
Subjects: subject: Astrophysics (astro-ph)
subject: FOS: Physical sciences

description: We present a Gaussianity analysis of the WMAP 5-year Cosmic Microwave Background (CMB) temperature anisotropy data maps. We use several third order estimators based on the spherical Mexican hat wavelet. We impose constraints on the local non-linear coupling parameter fnl using well motivated non-Gaussian simulations. We analyse the WMAP maps at resolution of 6.9 arcmin for the Q, V, and W frequency bands. We use the KQ75 mask recommended by the WMAP team which masks out 28% of the sky. The wavelet coefficients are evaluated at 10 different scales from 6.9 to 150 arcmin. With these coefficients we compute the third order estimators which are used to perform a chi-squared analysis. The chi-squared statistic is used to test the Gaussianity of the WMAP data as well as to constrain the fnl parameter. Our results indicate that the WMAP data are compatible with the Gaussian simulations, and the fnl parameter is constrained to -8 < fnl < +111 at 95% CL for the combined V+W map. This value has been corrected for the presence of undetected point sources, which add a positive contribution of Delta_fnl = 3+-5 in the V+W map. Our results are very similar to those obtained by Komatsu et al (2008) using the bispectrum.
description: 10 pages, 5 figures, 2 tables. Minor revision, references added, accepted for publication in MNRAS
Andrzej Walicki, Russia, Poland and Universal Regeneration. Studies on Russian and Polish Thought of the Romantic Epoch
Creators: name: Hübner, Eckhard
Publisher: name: Zeitschrift für Ostmitteleuropa-Forschung
Year: 1997

description: Zeitschrift für Ostmitteleuropa-Forschung, Bd. 46 Nr. 1 (1997)
Aspects of the feeding ecology of the garden cross-spider, Araneus diadematus Clerck
Creators: name: Smith, Risa Barbara
Publisher: name: University of British Columbia
Year: 2010

description: A field study on the feeding ecology of juvenile cross-spiders confirmed the work of other researchers that "boom and bust" best describes the availability of prey for these spiderlings; most of the Araneus diadematus Clerck webs observed captured no prey but occasionally prey catches were very high. During the "bust" phases of prey availability cross-spiderlings were adept at switching to alternate food sources like the microorganisms that are filtered out of the air by their sticky orb-webs. This study established, for the first time, that spiderlings are able to gain substantial nutrition from this aerial plankton by eating it when they consume their old webs. Birch pollen, Betula papyrifera, lengthened the lifespan of both second and third instar spiderlings. Feeding on birch pollen also resulted in an increased frequency of webspinning for second instars and a decline in the number of 12-hour intervals required to spin a new web. Fungous spores, Cladosporium herbarum, however, provided no nutritional value and may have been deleterious. Third instar spiderlings feeding on fungus spun less frequently than both the pollen-fed and starving groups. During the "boom" phases of prey availability a functional response of cross-spiderlings was their ability to respond to increased prey density, as determined in the laboratory experiments. When an hymenopterous parasitoid Aphidius nigripes, was the prey species hungry spiderlings with no predatory experience exhibited an exponential functional response curve. However, once they had a day of capturing prey they responded with a Type 2 response. When an aphid, Macrosiphum euphorbiae, was offered as the prey species predatory experience did not have an effect and the spiderlings exhibited a Type 2 response.
Ruppeiner Geometry of RN Black Holes: Flat or Curved?
Creators: name: Mirza, Behrouz
name: Zamani-Nasab, Mohammad
Publisher: name: arXiv
Year: 2007
Subjects: subject: High Energy Physics - Theory (hep-th)
subject: FOS: Physical sciences

description: In some recent studies \cite{aman1, aman2, aman3}, Aman {\it et al.} used the Ruppeiner scalar as a measure of underlying interactions of Reissner-Nordström black holes, indicating that it is a non-interacting statistical system for which classical thermodynamics could be used at any scale. Here, we show that if we use the complete set of thermodynamic variables, a non-flat state space will be produced. Furthermore, the Ruppeiner curvature diverges at extremal limits, as it would for other types of black holes.
description: 9 pages
Mirosław Ossowski, Literatura powrotów - powrót literatury. Prusy Wschodnie w prozie niemieckiej po 1945 roku
Creators: name: Danilewska, Katarzyna
Publisher: name: Zeitschrift für Ostmitteleuropa-Forschung
Year: 2013

description: Zeitschrift für Ostmitteleuropa-Forschung, Bd. 62 Nr. 4 (2013)
State-Operator Correspondence in Celestial Conformal Field Theory
Creators: name: Crawley, Erin
name: Miller, Noah
name: Narayanan, Sruthi A.
name: Strominger, Andrew
Publisher: name: arXiv
Year: 2021
Subjects: subject: High Energy Physics - Theory (hep-th)
subject: FOS: Physical sciences

description: The bulk-to-boundary dictionary for 4D celestial holography is given a new entry defining 2D boundary states living on oriented circles on the celestial sphere. The states are constructed using the 2D CFT state-operator correspondence from operator insertions corresponding to either incoming or outgoing particles which cross the celestial sphere inside the circle. The BPZ construction is applied to give an inner product on such states whose associated bulk adjoints are shown to involve a shadow transform. Scattering amplitudes are then given by BPZ inner products between states living on the same circle but with opposite orientations. 2D boundary states are found to encode the same information as their 4D bulk counterparts, but organized in a radically different manner.
description: 13 pages, 2 figures
Stellar collisions in flattened and rotating Pop. III star clusters
Creators: name: Vergara, M. Z. C.
name: Schleicher, D. R. G.
name: Boekholt, T. C. N.
name: Reinoso, B.
name: Fellhauer, M.
name: Klessen, R. S.
name: Leigh, N. W. C.
Publisher: name: arXiv
Year: 2021
Subjects: subject: Astrophysics of Galaxies (astro-ph.GA)
subject: Cosmology and Nongalactic Astrophysics (astro-ph.CO)
subject: FOS: Physical sciences

description: Fragmentation often occurs in disk-like structures, both in the early Universe and in the context of present-day star formation. Supermassive black holes (SMBHs) are astrophysical objects whose origin is not well understood; they weigh millions of solar masses and reside in the centers of galaxies. An important formation scenario for SMBHs is based on collisions and mergers of stars in a massive cluster, in which the most massive star moves to the center of the cluster due to dynamical friction. This increases the rate of collisions and mergers since massive stars have larger collisional cross sections. This can lead to runaway growth of a very massive star which may collapse to become an intermediate-mass black hole. Here we investigate the dynamical evolution of Miyamoto-Nagai models that allow us to describe dense stellar clusters, including flattening and different degrees of rotation. We find that the collisions in these clusters depend mostly on the number of stars and the initial stellar radii for a given radial size of the cluster. By comparison, rotation seems to affect the collision rate by at most $20\%$. For flatness, we compared spherical models with systems that have a scale height of about $10\%$ of their radial extent, in this case finding a change in the collision rate of less than $25\%$. Overall, we conclude that the parameters only have a minor effect on the number of collisions. Our results also suggest that rotation helps to retain more stars in the system, reducing the number of escapers by a factor of $2-3$ depending on the model and the specific realization. After two million years, a typical lifetime of a very massive star, we find that about $630$ collisions occur in typical models with $N=10^4$, $R=100$ $\rm~R_\odot$ and a half-mass radius of $0.1$ $\rm~pc$, leading to a mass of about $6.3\times10^3$ $\rm~M_\odot$ for the most massive object.
description: 10 pages, 7 figures
Looking for intrinsic charm in the forward region at BNL RHIC and CERN LHC
Creators: name: Goncalves, V. P.
name: Navarra, F. S.
name: Ullrich, T.
Publisher: name: arXiv
Year: 2008
Subjects: subject: High Energy Physics - Phenomenology (hep-ph)
subject: High Energy Physics - Experiment (hep-ex)
subject: Nuclear Experiment (nucl-ex)
subject: Nuclear Theory (nucl-th)
subject: FOS: Physical sciences

description: The complete understanding of the basic constituents of hadrons and the hadronic dynamics at high energies are two of the main challenges for the theory of strong interactions. In particular, the existence of intrinsic heavy quark components in the hadron wave function must be confirmed (or disproved). In this paper we propose a new mechanism for the production of $D$-mesons at forward rapidities based on the Color Glass Condensate (CGC) formalism and demonstrate that the resulting transverse momentum spectra are strongly dependent on the behavior of the charm distribution at large Bjorken $x$. Our results show clearly that the hypothesis of intrinsic charm can be tested in $pp$ and $p(d) A$ collisions at RHIC and LHC.
description: 22 pages, 5 figures. Version to be published in Nuclear Physics A
A Mathematical Theory of Stochastic Microlensing I. Random Time-Delay Functions and Lensing Maps
Creators: name: Petters, Arlie O.
name: Rider, Brian
name: Teguia, Alberto M.
Publisher: name: arXiv
Year: 2008
Subjects: subject: Astrophysics (astro-ph)
subject: General Relativity and Quantum Cosmology (gr-qc)
subject: FOS: Physical sciences

description: Stochastic microlensing is a central tool in probing dark matter on galactic scales. From first principles, we initiate the development of a mathematical theory of stochastic microlensing. Beginning with the random time delay function and associated lensing map, we determine exact expressions for the mean and variance of these transformations. We characterize the exact p.d.f. of a normalized random time delay function at the origin, showing that it is a shifted gamma distribution, which also holds at leading order in the limit of a large number of point masses at a general point of the lens plane. For the large number of point masses limit, we also prove that the asymptotic p.d.f. of the random lensing map under a specified scaling converges to a bivariate normal distribution. We show analytically that the p.d.f. of the random scaled lensing map at leading order depends on the magnitude of the scaled bending angle due purely to point masses as well as demonstrate explicitly how this radial symmetry is broken at the next order. Interestingly, we found at leading order a formula linking the expectation and variance of the normalized random time delay function to the first Betti number of its domain. We also determine an asymptotic p.d.f. for the random bending angle vector and find an integral expression for the probability of a lens plane point being near a fixed point. Lastly, we show explicitly how the results are affected by location in the lens plane. The results of this paper are relevant to the theory of random fields and provide a platform for further generalizations as well as analytical limits for checking astrophysical studies of stochastic microlensing.
description: New layout, more details and discussion. To appear, Journal of Mathematical Physics
Energy resolution improvement in room-temperature CZT detectors
Creators: name: Ramachers, Y.
name: Stewart, D. Y.
Publisher: name: arXiv
Year: 2007
Subjects: subject: Instrumentation and Detectors (physics.ins-det)
subject: FOS: Physical sciences

description: We present methods to improve the energy resolution of single-channel, room-temperature Cadmium-Zinc-Telluride (CZT) detectors. A new preamplifier design enables the acquisition of the actual transient current from the crystals and straightforward data analysis methods yield unprecedented energy resolution for our test-detectors. These consist of an eV-CAPture Plus crystal as standard and 1 cm cube Frisch collar crystals created in-house from low-grade coplanar grid detectors. Energy resolutions of 1.9% for our collar detectors and 0.8% for the eV crystal at 662 keV were obtained. The latter compares favourably to the best existing energy resolution results from pixel detectors.
description: 12 pages, 10 figures, 1 table, submitted to Journal of Instrumentation
Affine Deligne-Lusztig varieties in affine flag varieties
Creators: name: Goertz, Ulrich
name: Haines, Thomas J.
name: Kottwitz, Robert E.
name: Reuman, Daniel C.
Publisher: name: arXiv
Year: 2008
Subjects: subject: Algebraic Geometry (math.AG)
subject: Representation Theory (math.RT)
subject: FOS: Mathematics

description: This paper studies affine Deligne-Lusztig varieties in the affine flag manifold of a split group. Among other things, it proves emptiness for certain of these varieties, relates some of them to those for Levi subgroups, extends previous conjectures concerning their dimensions, and generalizes the superset method.
description: 44 pages, 4 figures. Minor changes to font, references, and acknowledgments. Improved introduction, other improvements in exposition, and two new figures added, for a total of 4
Hidden vortex lattices in a thermally paired superfluid
Creators: name: Dahl, E. K.
name: Babaev, E.
name: Sudbo, A.
Publisher: name: arXiv
Year: 2008
Subjects: subject: Statistical Mechanics (cond-mat.stat-mech)
subject: High Energy Physics - Lattice (hep-lat)
subject: FOS: Physical sciences

description: We study the evolution of rotational response of a hydrodynamic model of a two-component superfluid with a non-dissipative drag interaction, as the system undergoes a transition into a paired phase at finite temperature. The transition manifests itself in a change of (i) vortex lattice symmetry, and (ii) nature of vortex state. Instead of a vortex lattice, the system forms a highly disordered tangle which constantly undergoes merger and reconnecting processes involving different types of vortices, with a "hidden" breakdown of translational symmetry.
description: 4 pages, 5 figs. Submitted to Physical Review. Online suppl. material available; Ref. 6. V2: Fig. 1 re-sent, URL in Ref. 6 corrected
Carl Ditters von Dittersdorf 1739-1799. Der schlesische Opernkomponist
Creators: name: Salmen, Walter
Publisher: name: Zeitschrift für Ostmitteleuropa-Forschung
Year: 1995

description: Zeitschrift für Ostmitteleuropa-Forschung, Bd. 44 Nr. 3 (1995)
Sound Speeds, Cracking and Stability of Self-Gravitating Anisotropic Compact Objects
Creators: name: Abreu, H.
name: Hernandez, H.
name: Nunez, L. A.
Publisher: name: arXiv
Year: 2007
Subjects: subject: General Relativity and Quantum Cosmology (gr-qc)
subject: FOS: Physical sciences

description: Using the the concept of cracking we explore the influence of density fluctuations and local anisotropy have on the stability of local and non-local anisotropic matter configurations in general relativity. This concept, conceived to describe the behaviour of a fluid distribution just after its departure from equilibrium, provides an alternative approach to consider the stability of selfgravitating compact objects. We show that potentially unstable regions within a configuration can be identify as a function of the difference of propagations of sound along tangential and radial directions. In fact, it is found that these regions could occur when, at particular point within the distribution, the tangential speed of sound is greater than radial one.
description: 17 pages, 8 figures, 4 new references added. typos corrected
Die eindeutigen Funktionen mit linearen Transformationen in sich, Vorlesung von David Hilbert.
Vorlesungsnachschrift, ausgearbeitet von Julius Hurwitz
Creators: name: Hurwitz, Julius
name: Hilbert, David
Publisher: name: [s.n.]
Year: 1892

description: Nachschrift der Vorlesung, vorgetragen im Sommersemester 1892 an der Albertus-Universität Königsberg.
Von Hilbert durchgesehen und mit eigenhändigen Randbemerkungen versehen.
Text mit Figuren.
Abschliessend 6 Bl. leer
Exploring the catastrophic regime: thermodynamics and disintegration in head-on planetary collisions
Creators: name: Dou, Jingyao
name: Carter, Philip J
name: Lock, Simon
name: Leinhardt, Zoë M
Publisher: name: arXiv
Year: 2024
Subjects: subject: Earth and Planetary Astrophysics (astro-ph.EP)
subject: FOS: Physical sciences

description: Head-on giant impacts (collisions between planet-size bodies) are frequently used to study the planet formation process as they present an extreme configuration where the two colliding bodies are greatly disturbed. With limited computing resources, focusing on these extreme impacts eases the burden of exploring a large parameter space. Results from head-on impacts are often then extended to study oblique impacts with angle corrections or used as initial conditions for other calculations, for example, the evolution of ejected debris. In this study, we conduct a detailed investigation of the thermodynamic and energy budget evolution of high-energy head-on giant impacts, entering the catastrophic impacts regime, for target masses between 0.001 and 12 M$_{\oplus}$. We demonstrate the complex interplay of gravitational forces, shock dynamics, and thermodynamic processing in head-on impacts at high energy. Our study illustrates that frequent interactions of core material with the liquid side of the vapour curve could have cumulative effects on the post-collision remnants, leading to fragmentary disintegration occurring at lower impact energy. This results in the mass of the largest remnant diverging significantly from previously developed scaling laws. These findings suggest two key considerations: 1) head-on planetary collisions for different target masses do not behave similarly, so caution is needed when applying scaling laws across a broad parameter space; 2) an accurate model of the liquid-vapour phase boundary is essential for modeling giant impacts. Our findings highlight the need for careful consideration of impact configurations in planetary formation studies, as head-on impacts involve a complex interplay between thermodynamic processing, shocks, gravitational forces, and other factors.
description: Published in MNRAS, 25 pages, 21 figures