cometadata/datacite-rtg-text-other-reclassification-records huggingface dataset:
Rate-Distortion via Markov Chain Monte Carlo
Creators: name: Jalali, Shirin
name: Weissman, Tsachy
Publisher: name: arXiv
Year: 2008
Subjects: subject: Information Theory (cs.IT)
subject: FOS: Computer and information sciences
subject: 68P30

description: We propose an approach to lossy source coding, utilizing ideas from Gibbs sampling, simulated annealing, and Markov Chain Monte Carlo (MCMC). The idea is to sample a reconstruction sequence from a Boltzmann distribution associated with an energy function that incorporates the distortion between the source and reconstruction, the compressibility of the reconstruction, and the point sought on the rate-distortion curve. To sample from this distribution, we use a `heat bath algorithm': Starting from an initial candidate reconstruction (say the original source sequence), at every iteration, an index i is chosen and the i-th sequence component is replaced by drawing from the conditional probability distribution for that component given all the rest. At the end of this process, the encoder conveys the reconstruction to the decoder using universal lossless compression. The complexity of each iteration is independent of the sequence length and only linearly dependent on a certain context parameter (which grows sub-logarithmically with the sequence length). We show that the proposed algorithms achieve optimum rate-distortion performance in the limits of large number of iterations, and sequence length, when employed on any stationary ergodic source. Experimentation shows promising initial results. Employing our lossy compressors on noisy data, with appropriately chosen distortion measure and level, followed by a simple de-randomization operation, results in a family of denoisers that compares favorably (both theoretically and in practice) with other MCMC-based schemes, and with the Discrete Universal Denoiser (DUDE).
description: 35 pages, 16 figures, Submitted to IEEE Transactions on Information Theory
A stabilization mechanism for excited fermion-boson stars
Creators: name: Di Giovanni, Fabrizio
name: Fakhry, Saeed
name: Sanchis-Gual, Nicolas
name: Degollado, Juan Carlos
name: Font, José A.
Publisher: name: arXiv
Year: 2021
Subjects: subject: General Relativity and Quantum Cosmology (gr-qc)
subject: FOS: Physical sciences

description: We study numerically the nonlinear stability of {\it excited} fermion-boson stars in spherical symmetry. Such compound hypothetical stars, composed by fermions and bosons, are gravitationally bound, regular, and static configurations described within the coupled Einstein-Klein-Gordon-Euler theoretical framework. The excited configurations are characterized by the presence in the radial profile of the (complex, massive) scalar field -- the bosonic piece -- of at least one node across the star. The dynamical emergence of one such configuration from the accretion of a cloud of scalar field onto an already-formed neutron star, was numerically revealed in our previous investigation. Prompted by that finding we construct here equilibrium configurations of excited fermion-boson stars and study their stability properties using numerical-relativity simulations. In addition, we also analyze their dynamical formation from generic, constraint-satisfying initial data. Contrary to purely boson stars in the excited state, which are known to be generically unstable, our study reveals the appearance of a cooperative stabilization mechanism between the fermionic and bosonic constituents of those excited-state mixed stars. While similar examples of stabilization mechanisms have been recently discussed in the context of $\ell-$boson stars and multi-field, multi-frequency boson stars, our results seem to indicate that the stabilization mechanism is a purely gravitational effect and does not depend on the type of matter of the companion star.
description: 11 pages, 16 figures
Tylencholaimus teres Thorne 1939
Creators: name: Islam, Md Niraul
name: Ahmad, Wasim
Publisher: name: Zenodo
Year: 2021
Subjects: Biodiversity
Taxonomy
Animalia
Nematoda
Adenophorea
Dorylaimida
Dorylaimidae
Tylencholaimus
Tylencholaimus teres

description: Tylencholaimus teres Thorne, 1939
Fig. 3, Table 2
Tylencholaimus teres Thorne, 1939: 58–59.
Tylencholaimus teres – Jairajpuri 1965: 512. — Thorne 1974: 83. — Vinciguerra 1986: 112. — Peña- Santiago & Coomans 1994a: 59–66.
Material examined
INDIA • 1 ♀, 1 ♂; Kerala State, Palakkad district, Mukkali; 11º03′41.4″ N, 76º32′23.9″ E; 5–15 cm depth; 25 Oct. 2017; soil samples collected from around roots of shrubs (unidentified); slide reference number AMU/ZD/NC/ Tylencholaimus teres /1.
Remarks
Thorne (1939) described Tylencholaimus teres from the USA. Later, Jairajpuri (1965), Vinciguerra (1986) and Thorne (1974) redescribed this species from India, Italy and the USA, respectively. Peña- Santiago & Coomans (1994a), in their revision of the genus Tylencholaimus, restudied the type material and added two more populations from Spain. The morphometrics of the present specimens conform well with the type population except in having a slightly shorter body length (0.78 vs 0.88–1.0 mm); shorter pharyngeal expansion (76 vs 102–110 μm); slightly anterior vulva position (V = 55.6 vs 58.8–62.3); lower c (44.7 vs 55–67) ratio and smaller spicules (28 vs 30–32 μm). The present specimens also conform well with the Indian population except in having a slightly shorter and slender body (0.78 vs 0.9 mm, a = 30.9 vs 25) and lower c (44.7 vs 50) ratio. The present specimens also conform well with Spanish populations except for having a slightly smaller pharynx (184 vs 191–228 μm) and comparatively anterior vulva position (V = 55.6 vs 62–66). These differences are considered here as intraspecific variability.
description: Published as part of Islam, Md Niraul & Ahmad, Wasim, 2021, Five new and five known species of the genus Tylencholaimus de Man, 1876 (Nematoda: Dorylaimida: Tylencholaimoidea) from Western Ghats of India, pp. 58-105 in European Journal of Taxonomy 774 (1) on page 65, DOI: 10.5852/ejt.2021.774.1531, http://zenodo.org/record/5557162
Study molecular of interaction between N,N-dimethyltryptamine analogs (DMT) with 5-HT1A and 5-HT1B receptors, associated in neuronal alterations
Creators: name: Hilder Mercado-La Peira
name: Dussan-Ordoñez, José
name: Antistio  Alvíz-Amador
name: Neyder Contreras-Puentes
name: Castro-Bocanegra, Veronica
name: Liñan-Tobías, Francisco
name: Karick Jotty-Arroyo
Publisher: name: F1000 Research Limited
Year: 2019

description: Study molecular of interaction between N,N-dimethyltryptamine analogs (DMT) with 5-HT1A and 5-HT1B receptors. Likewise, complexes mechanisms that related the interaction with these receptors involved in alterations such as depression, post-traumatic stress disorders and anxiety. Therefore, have been evaluated the activity of DMT analogs by docking molecular studies in the determination of the ligand-receptor interaction. We identified new DMT analogs with activity in serotonergic receptors with high structural and energy affinity. The complexes of receptors-ligands were refined demonstrated possibly new tools of agents for the treatment of alterations related to pathologies with this type of receptors.
Population synthesis of radio and gamma-ray millisecond pulsars from the Galactic disk
Creators: name: Story, Sarah A.
name: Gonthier, Peter L.
name: Harding, Alice K.
Publisher: name: arXiv
Year: 2007
Subjects: subject: Astrophysics (astro-ph)
subject: FOS: Physical sciences

description: We present results of a population synthesis of millisecond pulsars from the Galactic disk. Excluding globular clusters, we model the spatial distribution of millisecond pulsars by assuming their birth in the Galactic disk with a random kick velocity and evolve them to the present within the Galactic potential. We assume that normal and millisecond pulsars are standard candles described with a common radio luminosity model that invokes a new relationship between radio core and cone emission suggested by recent studies. In modeling the radio emission beams, we explore the relativistic effects of time delay, aberration and sweepback of the open field lines. While these effects are essential in understanding pulse profiles, the phase-averaged flux is adequately described without a relativistic model. We use a polar cap acceleration model for the gamma-ray emission. We present the preliminary results of our recent study and the implications for observing millisecond pulsars with GLAST and AGILE.
description: 38 pages, 10 figures, accepted in ApJ - new version
Laura Neri (ed.), Un’idea di poesia. L’officina dei poeti in Italia nel secondo Novecento
Creators: name: Mazzucco, Thomas
Publisher: name: Università degli Studi di Cagliari
Year: 2019

description: Pubblicato nella collata Eterotopie dell’editore Mimesis, Un’idea di poesia si compone di dieci interventi critici (riporto, in ordine, nome del critico e poeta studiato: Federica Pasquin – Attilio Bertolucci; Gianluca Catalfamo – Giorgio Caproni; Sara Pesatori – Vittorio Sereni; Beatrice Cristalli – Mario Luzi; Ludovica del Castillo – Franco Fortini; Luca Bernardi – Andrea Zanzotto; Margherita Colombo – Pier Paolo Pasolini; Laura Neri – Giovanni Giudici; Giuseppe Carrara – Edoardo Sanguineti; Marco Villa – Giovanni Raboni). Ad apertura del volume si ritrova l’incipitaria La critica dei poeti (7-10), firmata dalla curatrice (di cui mi si permetta di ricordare, data la concomitanza di occasioni giudiciane, l’ancor più recente I silenziosi circuiti del ricordo. Etica, estetica e ideologia nelle poesie di Giovanni Giudici, Roma, Carocci, 2018; volume che accresce la ben nota bibliografia critica della studiosa sulla poesia del Novecento italiano).
description: Between, Vol 9, No 17 (2019): Imagining the Impossible: Crossings of Creativity Between Literature and Science
Binding of Nucleobases with Single-Walled Carbon Nanotubes
Creators: name: Das, Anindya
name: Sood, A. K.
name: Maiti, Prabal K.
name: Das, Mili
name: Varadarajan, R.
name: Rao, C. N. R.
Publisher: name: arXiv
Year: 2007
Subjects: subject: Materials Science (cond-mat.mtrl-sci)
subject: Soft Condensed Matter (cond-mat.soft)
subject: FOS: Physical sciences

description: We have calculated the binding energy of various nucleobases (guanine (G), adenine (A), thymine (T) and cytosine (C)) with (5,5) single-walled carbon nanotubes (SWNTs) using ab-initio Hartre-Fock method (HF) together with force field calculations. The gas phase binding energies follow the sequence G $>$ A $>$ T $>$ C. We show that main contribution to binding energy comes from van-der Wall (vdW) interaction between nanotube and nucleobases. We compare these results with the interaction of nucleobases with graphene. We show that the binding energy of bases with SWNTs is much lower than the graphene but the sequence remains same. When we include the effect of solvation energy (Poisson-Boltzman (PB) solver at HF level), the binding energy follow the sequence G $>$ T $>$ A $>$ C $>$, which explains the experiment\cite{zheng} that oligonucleotides made of thymine bases are more effective in dispersing the SWNT in aqueous solution as compared to poly (A) and poly (C). We also demonstrate experimentally that there is differential binding affinity of nucleobases with the single-walled carbon nanotubes (SWNTs) by directly measuring the binding strength using isothermal titration (micro) calorimetry. The binding sequence of the nucleobases varies as thymine (T) $>$ adenine (A) $>$ cytosine (C), in agreement with our calculation.
description: 7 pages, 6 figures
Improving Quantum State Estimation with Mutually Unbiased Bases
Creators: name: Adamson, Robert B. A.
name: Steinberg, Aephraim M.
Publisher: name: arXiv
Year: 2008
Subjects: subject: Quantum Physics (quant-ph)
subject: FOS: Physical sciences

description: When used in quantum state estimation, projections onto mutually unbiased bases have the ability to maximize information extraction per measurement and to minimize redundancy. We present the first experimental demonstration of quantum state tomography of two-qubit polarization states to take advantage of mutually unbiased bases. We demonstrate improved state estimation as compared to standard measurement strategies and discuss how this can be understood from the structure of the measurements we use. We experimentally compared our method to the standard state estimation method for three different states and observe that the infidelity was up to 1.84+/-0.06 times lower using our technique than it was using standard state estimation methods.
description: 5 pages, 2 figures, 1 table
Turbulent transport of material particles: An experimental study of finite size effects
Creators: name: Qureshi, Nauman M.
name: Bourgoin, Mickael
name: Baudet, Christophe
name: Cartellier, Alain
name: Gagne, Yves
Publisher: name: arXiv
Year: 2007
Subjects: subject: Fluid Dynamics (physics.flu-dyn)
subject: FOS: Physical sciences

description: We use an acoustic Lagrangian tracking technique, particularly adapted to measurements in open flows, and a versatile material particles generator (in the form of soap bubbles with adjustable size and density) to characterize Lagrangian statistics of finite sized, neutrally bouyant, particles transported in an isotropic turbulent flow of air. We vary the size of the particles in a range corresponding to turbulent inertial scales and explore how the turbulent forcing experienced by the particles depends on their size. We show that, while the global shape of the intermittent acceleration probability density function does not depend significantly on particle size, the acceleration variance of the particles decreases as they become larger in agreement with the classical scaling for the spectrum of Eulerian pressure fluctuations in the carrier flow.
MugRep: A Multi-Task Hierarchical Graph Representation Learning Framework for Real Estate Appraisal
Creators: name: Zhang, Weijia
name: Liu, Hao
name: Zha, Lijun
name: Zhu, Hengshu
name: Liu, Ji
name: Dou, Dejing
name: Xiong, Hui
Publisher: name: arXiv
Year: 2021
Subjects: subject: Machine Learning (cs.LG)
subject: FOS: Computer and information sciences

description: Real estate appraisal refers to the process of developing an unbiased opinion for real property's market value, which plays a vital role in decision-making for various players in the marketplace (e.g., real estate agents, appraisers, lenders, and buyers). However, it is a nontrivial task for accurate real estate appraisal because of three major challenges: (1) The complicated influencing factors for property value; (2) The asynchronously spatiotemporal dependencies among real estate transactions; (3) The diversified correlations between residential communities. To this end, we propose a Multi-Task Hierarchical Graph Representation Learning (MugRep) framework for accurate real estate appraisal. Specifically, by acquiring and integrating multi-source urban data, we first construct a rich feature set to comprehensively profile the real estate from multiple perspectives (e.g., geographical distribution, human mobility distribution, and resident demographics distribution). Then, an evolving real estate transaction graph and a corresponding event graph convolution module are proposed to incorporate asynchronously spatiotemporal dependencies among real estate transactions. Moreover, to further incorporate valuable knowledge from the view of residential communities, we devise a hierarchical heterogeneous community graph convolution module to capture diversified correlations between residential communities. Finally, an urban district partitioned multi-task learning module is introduced to generate differently distributed value opinions for real estate. Extensive experiments on two real-world datasets demonstrate the effectiveness of MugRep and its components and features.
description: 11 pages, SIGKDD-2021
Tylencholaimus micronanus Yeates 1979
Creators: name: Islam, Md Niraul
name: Ahmad, Wasim
Publisher: name: Zenodo
Year: 2021
Subjects: Biodiversity
Taxonomy
Animalia
Nematoda
Adenophorea
Dorylaimida
Dorylaimidae
Tylencholaimus
Tylencholaimus micronanus

description: Tylencholaimus micronanus Yeates, 1979
Fig. 4, Table 3
Tylencholaimus micronanus Yeates, 1979: 423–425.
Tylencholaimus vanguimus Mohilal & Dhanachand, 2000: 33–35.
Tylencholaimus micronanus – Peña-Santiago & Coomans 1994c: 362–364. — Peña-Santiago 2008: 123.
Material examined
INDIA – Kerala State • 6 ♀♀; Kasaragod district, Ranipuram National Park; 12.4º26′18.3″ N, 75.3º58′94.4″ E; 5–15 cm depth; 15 Nov. 2016; soil samples collected from around the roots of grasses (unidentified); slides reference number AMU/ZD/NC/ Tylencholaimus micronanus /1–3. – Karnataka State • 4 ♀♀; Kodagu district, Bhagamandala; 12°23′29.1″ N, 75°31′50.0″ E; 5–15 cm depth; 8 Nov. 2016; soil samples collected from around the roots of grasses (unidentified); slides reference number AMU/ZD/NC/ Tylencholaimus micronanus /4–6.
Remarks
Yeates (1979) described Tylencholaimus micronanus from New Zealand. Baqri (1991) reported it from Sikkim, India whereas, Peña-Santiago & Coomans (1994c) restudied the type material of this species and provided a complete description. Mohilal & Dhanachand (2000) described a new species, Tylencholaimus vanguimus from Manipur, India which was synonymized with T. micronanus by Peña- Santiago (2008). The morphometrics of the present populations conform well with the type population except in having a slightly shorter odontostyle (4.5–5.5 vs 6.0–7.0 μm) and in the presence of a terminal caudal pore (vs absent). The present population also conforms well with Sikkim as well as Manipur populations except in having a shorter and robust body (0.31–0.39 vs 0.44 mm, a = 17–23 vs 25); lower b value (2.4–2.8 vs 3.6); a slightly shorter odontostyle (4.5–5.5 vs 6.0 µm) and tail (11–12 vs 13 µm) than in the Sikkim population; and a slightly lower c’ ratio (0.8–1.0 vs 1.0–1.1) than in Manipur population, as well as the presence of terminal caudal pore (vs absent in the Manipur population).
description: Published as part of Islam, Md Niraul & Ahmad, Wasim, 2021, Five new and five known species of the genus Tylencholaimus de Man, 1876 (Nematoda: Dorylaimida: Tylencholaimoidea) from Western Ghats of India, pp. 58-105 in European Journal of Taxonomy 774 (1) on pages 65-69, DOI: 10.5852/ejt.2021.774.1531, http://zenodo.org/record/5557162
The Distance of the First Overtone RR Lyrae Variables in the MACHO LMC Database: A New Method to Correct for the Effects of Crowding
Creators: name: Clement, C. M.
name: Xu, X.
name: Muzzin, A. V.
Publisher: name: arXiv
Year: 2007
Subjects: subject: Astrophysics (astro-ph)
subject: FOS: Physical sciences

description: Previous studies have indicated that many of the RR Lyrae variables in the LMC have properties similar to the ones in the Galactic globular cluster M3. Assuming that the M3 RR Lyrae variables follow the same relationships among period, temperature, amplitude and Fourier phase parameter phi31 as their LMC counterparts, we have used the M3 phi31-logP relation to identify the M3-like unevolved first overtone RR Lyrae variables in 16 fields near the LMC bar. The temperatures of these variables were calculated from the M3 logP-logTe relation so that the extinction could be derived for each star separately. Since blended stars have lower amplitudes for a given period, the period amplitude relation should be a useful tool for identifying which stars are affected by crowding. We find that the low amplitude stars are brighter. We remove them from the sample and derive an LMC distance modulus 18.49+/-0.11.
description: 30 pages, 7 figures, accepted for publication in the Astronomical Journal
Tube material and augmented surface effects in heat exchanger scaling
Creators: name: Sheikholeslami, Roya
Publisher: name: University of British Columbia
Year: 2010

description: The performance of stainless steel, copper and mild steel plain heat exchanger tubes and an externally-finned mild steel tube was studied under calcium carbonate scaling conditions at constant heat flux. Artificial hard waters made up with sodium bicarbonate and calcium salts to alkalinities up to 350 mg CaCO₃/l and calcium hardness to 650 mg CaCO₃/l were recirculated through a steam heated annular test section for periods of 70 hours. The effect of velocity on the rate of heat flow, the overall heat transfer coefficient, the fouling resistance and the fouling rate has been determined. Fouling resistance increased with time in a linear manner in the majority of runs although falling rate and asymptotic behaviour were also observed. Initial scaling rates were compared with the predictions of Hasson's ionic diffusion model. Generally, scaling decreased in extent as the tube material was changed from mild steel to copper to stainless steel, although there were some operating conditions where this trend was not followed. No firm conclusion could be drawn concerning initial fouling rates for these experiments which were done primarily at low levels of water alkalinity. The longitudinally finned mild steel tube, having fin and total surface efficiencies of 33Δ and 53Δ, respectively, was examined under the same operating conditions as for the plain mild steel tube. In addition to higher values of heat flow rate, the former had higher values of both the clean and the dirty overall heat transfer coefficients along with the lower values of fouling resistance, all based on the nominal (bare-tube) outside area. The deposits were thicker on the prime surface. The fouling process appeared to be more gradual on the finned tube than on the plain tube. However, the model predictions suggested a slightly higher rate for the finned tube at the same velocity. For all tubes, the clean and the dirty overall heat transfer coefficients and the predicted fouling rates increased with velocity. Generally, the fouling resistances decreased with increasing velocity except for the copper tube at high alkalinity. No generalization could be made regarding the relationship between the experimental values of fouling rate and the velocity for either of non-corroding plain tubes. However, for corroding tubes, as the velocity increased, the fouling rate decreased. The finned tube appears to be the most suitable choice in the presence of hard water scaling. In the velocity region tested, the model can be safely applied to predict the scaling rate of the copper and both mild steel tubes at alkalinities of about 350 since it over-predicted the experimental values; however it does not predict the effect of velocity.
(Anti-)dual-BRST symmetries: Abelian 2-form gauge theory
Creators: name: Malik, R. P.
Publisher: name: arXiv
Year: 2008
Subjects: subject: High Energy Physics - Theory (hep-th)
subject: FOS: Physical sciences

description: We derive the absolutely anticommuting (anti-)dual-BRST symmetry transformations for the appropriate Lagrangian densities of the (3 + 1)-dimensional (4D) free Abelian 2-form gauge theory, under which, the total gauge-fixing term remains invariant. These symmetry transformations are the analogue of the co-exterior derivative of differential geometry, in the same sense, as the absolutely anticommuting (anti-)BRST symmetry transformations are the analogue of the exterior derivative. A bosonic symmetry transformation is shown to be the analogue of the Laplacian operator. The algebraic structures of these symmetry transformations are derived and they are demonstrated to be the reminiscent of the algebra obeyed by the de Rham cohomological operators of differential geometry.
description: LaTeX file, 11 pages, journal reference
q-generalized Tsallis thermostatistics in Unruh effect for mixed fields
Creators: name: Luciano, Giuseppe Gaetano
name: Blasone, Massimo
Publisher: name: arXiv
Year: 2021
Subjects: subject: High Energy Physics - Theory (hep-th)
subject: FOS: Physical sciences

description: It was shown that the particle distribution detected by a uniformly accelerated observer in the inertial vacuum (Unruh effect) deviates from the pure Planckian spectrum when considering the superposition of fields with different masses. Here we elaborate on the statistical origin of this phenomenon. In a suitable regime, we provide an effective description of the emergent distribution in terms of the nonextensive q-generalized statistics based on Tsallis entropy. This picture allows us to establish a nontrivial relation between the q-entropic index and the characteristic mixing parameters sinθ and Δm. In particular, we infer that q < 1, indicating the superadditive feature of Tsallis entropy in this framework. We discuss our result in connection with the entangled condensate structure acquired by the quantum vacuum for mixed fields.
description: 15 pages, 2 figures
The second homology group of current Lie algebras
Creators: name: Zusmanovich, Pasha
Publisher: name: arXiv
Year: 2008
Subjects: subject: K-Theory and Homology (math.KT)
subject: Rings and Algebras (math.RA)
subject: FOS: Mathematics
subject: 17B56, 17B60, 13D03

description: This is an old paper put here for archeological purposes. We derive a general formula expressing the second homology of a Lie algebra of the form L\otimes A with coefficients in the trivial module through homology of $L$, cyclic homology of $A$, and other invariants of $L$ and $A$. This is achieved by using the Hopf formula expressing the second homology of a Lie algebra in terms of its presentation. We also derive a similar formula for the associated Lie algebra of the tensor product of two associative algebras.
description: v4: fixed few typos and confusing notation
Casimir effect in a one-dimensional gas of free fermions
Creators: name: Kolomeisky, Eugene B.
name: Straley, Joseph P.
name: Timmins, Michael
Publisher: name: arXiv
Year: 2007
Subjects: subject: Mesoscale and Nanoscale Physics (cond-mat.mes-hall)
subject: High Energy Physics - Theory (hep-th)
subject: Quantum Physics (quant-ph)
subject: FOS: Physical sciences

description: We compute an analog Casimir effect in a one-dimensional spinless Luttinger liquid confined to a segment in the presence of a nearly-impenetrable partition dividing the segment into two compartments. The Casimir interaction is found to be a bounded piecewise-continuous oscillatory function whose maxima are points of force discontinuity and correspond to resonant tunneling across the partition. The well-known regularization-based results are reproduced by the lower envelope of this function, which corresponds to an approximation that ignores the rather large oscillations due to particle discreteness. These macroscopic conclusions are tested and confirmed via a rigorous analysis of the Casimir effect in an exactly-solvable model of a one-dimensional non-relativistic spinless gas of free fermions, thus resolving an objection that has been raised by Volovik (2003). Additionally we confirm the result of a recent calculation which employed an effective low-energy theory with a cutoff to find the Casimir interaction between two strong well-separated impurities placed in a Luttinger liquid.
description: 13 pages, 5 figures. A generalization to the case of an arbitrary harmonic liquid is given and discussion is improved. Version to be published in Phys. Rev. A
Discarding Textiles - Amsterdam Pilot Booklet
Creators: name: Brinks, Ger
name: Luiken, Anton
name: Skelton, Laurie (Editor)
Publisher: name: Zenodo
Year: 2021

description: The textile industry has a high environmental impact, whether it is through the production of the fibres, the processes of making a fabric or textile product, or the use of the final product (e.g. washing, drying, or ironing). In the context of global climate change, it is more important than ever to ensure that the amount of energy we put into the textile industry is not wasted. A simple way to conserve energy in the industry cycle is to use one’s textile products for as long as possible. Of course, there may also be times where you no longer want to keep the product. In cases like these, you have several options for prolonging the use of the product (and the materials from which it’s made) to reduce the environmental impact. Here are a few easy ways to extend the life of your textiles (while also helping people and the planet)
Factors limiting quantitative phase retrieval in atomic-resolution differential phase contrast scanning transmission electron microscopy using a segmented detector
Creators: name: Mawson, T.
name: Taplin, D. J.
name: Brown, H. G.
name: Clark, L.
name: Ishikawa, R.
name: Seki, T.
name: Ikuhara, Y.
name: Shibata, N.
name: Paganin, D. M.
name: Morgan, M. J.
name: Weyland, M.
name: Petersen, T. C.
name: Findlay, S. D.
Publisher: name: arXiv
Year: 2021
Subjects: subject: Materials Science (cond-mat.mtrl-sci)
subject: FOS: Physical sciences

description: Quantitative differential phase contrast imaging of materials in atomic-resolution scanning transmission electron microscopy using segmented detectors is limited by various factors, including coherent and incoherent aberrations, detector positioning and uniformity, and scan-distortion. By comparing experimental case studies of monolayer and few-layer graphene with image simulations, we explore which parameters require the most precise characterisation for reliable and quantitative interpretation of the reconstructed phases. Coherent and incoherent lens aberrations are found to have the most significant impact. For images over a large field of view, the impact of noise and non-periodic boundary conditions are appreciable, but in this case study have less of an impact than artefacts introduced by beam deflections coupling to beam scanning (imperfect tilt-shift purity).
description: 16 pages, 9 figures
Intermittency and Universality in Fully-Developed Inviscid and Weakly-Compressible Turbulent Flows
Creators: name: Benzi, Roberto
name: Biferale, Luca
name: Fisher, Robert
name: Kadanoff, Leo
name: Lamb, Donald
name: Toschi, Federico
Publisher: name: arXiv
Year: 2007
Subjects: subject: Chaotic Dynamics (nlin.CD)
subject: Fluid Dynamics (physics.flu-dyn)
subject: FOS: Physical sciences

description: We performed high resolution numerical simulations of homogenous and isotropic compressible turbulence, with an average 3D Mach number close to 0.3. We study the statistical properties of intermittency for velocity, density and entropy. For the velocity field, which is the primary quantity that can be compared to the isotropic incompressible case, we find no statistical differences in its behavior in the inertial range due either to the slight compressibility or to the different dissipative mechanism. For the density field, we find evidence of ``front-like'' structures, although no shocks are produced by the simulation.
description: Submitted to Phys. Rev. Lett
Perfect, strongly eutactic lattices are periodic extreme
Creators: name: Schürmann, Achill
Publisher: name: arXiv
Year: 2008
Subjects: subject: Metric Geometry (math.MG)
subject: Number Theory (math.NT)
subject: FOS: Mathematics
subject: 52C17, 11H55

description: We introduce a parameter space for periodic point sets, given as unions of $m$ translates of point lattices. In it we investigate the behavior of the sphere packing density function and derive sufficient conditions for local optimality. Using these criteria we prove that perfect, strongly eutactic lattices cannot be locally improved to yield a periodic sphere packing with greater density. This applies in particular to the densest known lattice sphere packings in dimension $d\leq 8$ and $d=24$.
description: 20 pages, 1 table; some corrections, incorporated referee suggestions
Duality of antidiagonals and pipe dreams
Creators: name: Jia, Ning
name: Miller, Ezra
Publisher: name: arXiv
Year: 2007
Subjects: subject: Combinatorics (math.CO)
subject: FOS: Mathematics
subject: 05E99 (Primary), 05E05, 20B30 (Secondary)

description: Weighted enumeration of reduced pipe dreams (or rc-graphs) results in a combinatorial expression for Schubert polynomials. The duality between the set of reduced pipe dreams and certain antidiagonals has important geometric implications [A. Knutson and E. Miller, Gröbner geometry of Schubert polynomials, Ann. Math. 161, 1245-1318]. The original proof of the duality was roundabout, relying on the algebra of certain monomial ideals and a recursive characterization of reduced pipe dreams. This paper provides a direct combinatorial proof.
description: 6 pages, 4 figures; v3=v2 = online published version: edited background exposition. (Why v3 = v2? Metadata issues.)
Spectra of primordial fluctuations in two-perfect-fluid regular bounces
Creators: name: Finelli, F.
name: Peter, P.
name: Pinto-Neto, N.
Publisher: name: arXiv
Year: 2007
Subjects: subject: General Relativity and Quantum Cosmology (gr-qc)
subject: FOS: Physical sciences

description: We introduce analytic solutions for a class of two components bouncing models, where the bounce is triggered by a negative energy density perfect fluid. The equation of state of the two components are constant in time, but otherwise unrelated. By numerically integrating regular equations for scalar cosmological perturbations, we find that the (would be) growing mode of the Newtonian potential before the bounce never matches with the the growing mode in the expanding stage. For the particular case of a negative energy density component with a stiff equation of state we give a detailed analytic study, which is in complete agreement with the numerical results. We also perform analytic and numerical calculations for long wavelength tensor perturbations, obtaining that, in most cases of interest, the tensor spectral index is independent of the negative energy fluid and given by the spectral index of the growing mode in the contracting stage. We compare our results with previous investigations in the literature.
description: 11 pages, 5 figures
Collecting Discarded Textiles - Amsterdam Pilot Booklet
Creators: name: Brinks, Ger
name: Luiken, Anton
name: Skelton, Laurie (Editor)
Publisher: name: Zenodo
Year: 2021

description: The textile industry has a high environmental impact, whether it is through the production of the fibres, the processes of making a fabric or textile product, or the use of the final product (e.g. washing, drying, or ironing). In the context of global climate change, it is more important than ever to ensure that the amount of energy we put into the textile industry is not wasted. A simple way to conserve energy in the industry cycle is to use one’s textile products for as long as possible. Of course, there may also be times where you no longer want to keep the product. In cases like these, you have several options for prolonging the use of the product (and the materials from which it’s made) to reduce the environmental impact. Here are a few easy ways to extend the life of your textiles (while also helping people and the planet)
On EPR-type Entanglement in the Experiments of Scully et Al. II. Insight in the Real Random Delayed-choice Erasure Experiment
Creators: name: Herbut, Fedor
Publisher: name: arXiv
Year: 2008
Subjects: subject: Quantum Physics (quant-ph)
subject: FOS: Physical sciences

description: It was pointed out in the first part of this study that EPR-type entanglement is defined by the possibility of performing any of two mutually incompatible distant, i. e.,direct-interaction-free, measurements. They go together under the term 'EPR-type disentanglement'. In this second part, quantum-mechanical insight is gained in the real random delayed-choice erasure experiment of Kim et al. [Kim et al.: Phys. Rev. Lett. 84, 1-5 (2000)] by a relative-reality-of- unitarily-evolving-state (RRUES) approach (explained in the first part). Finally, it is shown that this remarkable experiment, which performs, by random choice, two incompatible measurements at the same time, is actually an EPR-type disentanglement experiment, closely related to the micromaser experiment discussed in the first part.
description: Latex2e; one black figure; second part of a two-parts study; improved presentation
DEA degradation in heat exchanger tubes
Creators: name: Chakma, Amitabha
Publisher: name: University of British Columbia
Year: 2010

description: Aqueous diethanolamine ("DEA") is widely used for the removal of acid gases such as CO₂ and H₂S from natural gas as well as refinery gases. In addition to the desired absorption and desorption reactions, some side reactions occur between CO₂ and DEA resulting in the formation of degradation compounds. Degradation not only represents a loss of valuable DEA, but may also lead to operational problems such as corrosion, foaming and fouling. DEA degradation is a complex process and depends on solution concentration, raw gas composition, solution flow rate and (most importantly) temperature. Carefully controlled DEA degradation experiments were carried out in a coiled heat exchanger tube (2.032 mm ID, 3.175 mm OD and 4.8 m long) heated by means of a constant temperature heat transfer fluid. The operating conditions covered are: 1379 to 4137 kPa CO₂ partial pressure, 60 to 200 °C, 20 to 40 wt% DEA solutions and 0.011 L/s to 0.0172 L/s (3.4 m/s to 5.3 m/s) solution flow rate measured at 60 °C. The DEA degradation rate was found to increase with temperature, CO₂ partial pressure and DEA concentration and decrease with solution flow rate. Degradation resulted in severe fouling of the heat exchanger tube. The viscosity as well as foaming tendency of the solutions were found to increase with the concentration of degradation products. The following simple mathematical model for the prediction of DEA degradation in heat exchangers was developed : [See thesis for diagrams] Potentiodynamic corrosion studies as well as conventional weight loss tests were carried out and degraded DEA solutions were found to be corrosive towards AISI-SAE 1020 carbon steel. 3-(hydroxyethyl)-2-oxazolidone ( "HEOD") was identified as one of the corrosive components. Severe pitting of AISI-SAE 1020 carbon steel by HEOD was detected by electron micrographic analysis. Minor pitting was also noticed in the case of BHEP and DEA. Use of activated carbon filters and soda ash treatment were both found to be incapable of removing major degradation products. A purification method consisting of NaOH injection was developed and found to be effective in converting HEOD and N,N,N-tris-(hydroxyethyl)ethylenediamine ("THEED") back to DEA. However, conversion of HEOD to DEA apparently depends on the presence of other degradation compounds.
Low-temperature phonon thermal conductivity of cuprate single crystals
Creators: name: Li, S. Y.
name: Bonnemaison, J. -B.
name: Payeur, A.
name: Fournier, P.
name: Wang, C. H.
name: Chen, X. H.
name: Taillefer, Louis
Publisher: name: arXiv
Year: 2007
Subjects: subject: Superconductivity (cond-mat.supr-con)
subject: Strongly Correlated Electrons (cond-mat.str-el)
subject: FOS: Physical sciences

description: The effect of sample size and surface roughness on the phonon thermal conductivity $κ_p$ of Nd$_2$CuO$_4$ single crystals was studied down to 50 mK. At 0.5 K, $κ_p$ is proportional to $\sqrt{A}$, where $A$ is the cross-sectional area of the sample. This demonstrates that $κ_p$ is dominated by boundary scattering below 0.5 K or so. However, the expected $T^3$ dependence of $κ_p$ is not observed down to 50 mK. Upon roughing the surfaces, the $T^3$ dependence is restored, showing that departures from $T^3$ are due to specular reflection of phonons off the mirror-like sample surfaces. We propose an empirical power law fit, to $κ_p \sim T^α$ (where $α< 3$) in cuprate single crystals. Using this method, we show that recent thermal conductivity studies of Zn doping in YBa$_2$Cu$_3$O$_y$ re-affirm the universal heat conductivity of d-wave quasiparticles at $T \to 0$.
description: 4 pages, 4 figures
Exact gyratons in higher and infinite derivative gravity
Creators: name: Kolář, Ivan
name: Málek, Tomáš
name: Dengiz, Suat
name: Kilicarslan, Ercan
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: We study solutions describing spinning null sources called gyratons in generic theories of gravity with terms that are quadratic in curvature and contain an arbitrary number of covariant derivatives. In particular, we show that the properties of pp-waves of the algebraic type III allow for extreme simplification of the field equations. It turns out that the resulting differential equations are exactly solvable due to partial decoupling and linearity of the equations. This is demonstrated explicitly by finding axially symmetric gyraton solutions in Stelle's fourth derivative gravity and the non-local gravity with an infinite number of derivatives.
description: 28 pages, 2 figures, comments welcome!
Carbon and Strontium Abundances of Metal-Poor Stars
Creators: name: Lai, David K.
name: Johnson, Jennifer A.
name: Bolte, Michael
name: Lucatello, Sara
Publisher: name: arXiv
Year: 2007
Subjects: subject: Astrophysics (astro-ph)
subject: FOS: Physical sciences

description: We present carbon and strontium abundances for 100 metal-poor stars measured from R$\sim $7000 spectra obtained with the Echellette Spectrograph and Imager at the Keck Observatory. Using spectral synthesis of the G-band region, we have derived carbon abundances for stars ranging from [Fe/H]$=-1.3$ to [Fe/H]$=-3.8$. The formal errors are $\sim 0.2$ dex in [C/Fe]. The strontium abundance in these stars was measured using spectral synthesis of the resonance line at 4215 Å. Using these two abundance measurments along with the barium abundances from our previous study of these stars, we show it is possible to identify neutron-capture-rich stars with our spectra. We find, as in other studies, a large scatter in [C/Fe] below [Fe/H]$ = -2$. Of the stars with [Fe/H]$
description: ApJ, Accepted
Tylencholaimus cosmos
Creators: name: Islam, Md Niraul
name: Ahmad, Wasim
Publisher: name: Zenodo
Year: 2021
Subjects: Biodiversity
Taxonomy
Animalia
Nematoda
Adenophorea
Dorylaimida
Dorylaimidae
Tylencholaimus
Tylencholaimus cosmos

description: Tylencholaimus cosmos (Dhanam & Jairajpuri, 1999)
Fig. 6, Table 5
Amphitylencholaimus cosmos Dhanam & Jairajpuri, 1999: 2, 4
Tylencholaimus cosmos – Peña-Santiago 2008: 120–121.
Material examined
INDIA – Goa State • 3 ♀♀; South Goa district, Verna; 15º35.3′59.3″ N, 73º92.2′26.4″ E; 5–15 cm depth; 22 Apr. 2016; soil sample collected from around the roots of grasses (unidentified); slide reference number AMU/ZD/NC/ Tylencholaimus cosmos /1. – Kerala State • 3 ♀♀; Thiruvananthapuram district, Ponmudi hill; 8º45′36.2″ N, 77º07′08.2″ E; 5–15 cm depth; 4 Nov. 2017; soil sample collected from around the roots of grasses (unidentified); slide reference number AMU/ZD/NC/ Tylencholaimus cosmos /2.
Remarks
Dhanam & Jairajpuri (1999) described Amphitylencholaimus cosmos from Malnad tracts of Karnataka, India. Peña-Santiago (2008) did not accept the generic status of Amphitylencholaimus and transferred A. cosmos to Tylencholaimus. Ahad & Ahmad (2016) reported this species from Kaziranga National Park, Assam, India. Dhanam & Jairajpuri (1999) characterized this species by having the anterior slender part of pharynx expanding gradually to form the cylindroid basal part but in their fig. 1C, the anterior part of pharynx appears slender, expanding abruptly to form the basal expanded part. In the present specimens, the anterior part of pharynx is also slender, expanding abruptly to form the basal expanded part. The morphometrics of the present populations conform well with the type population except in having a shorter body length (0.55–0.76 vs 0.7–0.9 mm), slightly lower b value (3.1–4.2 vs 3.9–5.0) and shorter odontophore length (8.5–10 vs 12–14 μm). The present populations also conform well with the Assam population except in having a slightly higher lip region (3.0–3.5 vs 2.0–3.0 μm) and a longer rectum (17–22 vs 13–14 μm).
description: Published as part of Islam, Md Niraul & Ahmad, Wasim, 2021, Five new and five known species of the genus Tylencholaimus de Man, 1876 (Nematoda: Dorylaimida: Tylencholaimoidea) from Western Ghats of India, pp. 58-105 in European Journal of Taxonomy 774 (1) on pages 73-76, DOI: 10.5852/ejt.2021.774.1531, http://zenodo.org/record/5557162
Spitzer/IRS Observations of Seyfert 1.8s and 1.9s: A Comparison with Seyfert 1s and Seyfert 2s
Creators: name: Deo, R. P.
name: Crenshaw, D. M.
name: Kraemer, S. B.
name: Dietrich, M.
name: Elitzur, M.
name: Teplitz, H.
name: Turner, T. J.
Publisher: name: arXiv
Year: 2007
Subjects: subject: Astrophysics (astro-ph)
subject: FOS: Physical sciences

description: We present Spitzer Space Telescope mid-infrared spectra of 12 Seyfert 1.8 and 1.9 galaxies over the 5-38 um region. We compare the spectral characteristics of this sample to those of 58 Seyfert 1 and Seyfert 2 galaxies from the Spitzer archives. An analysis of the spectral shapes, the silicate 10 um feature and the emission line fluxes have enabled us to characterize the mid-IR properties of Seyfert 1.8/1.9s. We find that the equivalent widths of the 10 um silicate feature are generally weak in all Seyfert galaxies, as previously reported by several studies. The few Seyfert galaxies in this sample that show deep 10 um silicate absorption features are highly inclined and/or merging galaxies. It is likely that these absorption features originate primarily in the dusty interstellar medium of the host galaxy rather than in a dusty torus on parsec scales close to the central engine. We find that the equivalent width of the polycyclic aromatic hydrocarbon (PAH) band at 6.2 um correlates strongly with the 20-30 um spectral index. Either of these quantities are good indicators of the amount of starburst contribution to the mid-IR spectra. The spectra of Seyfert 1.8 and 1.9s are dominated by these starburst features, similar to most Seyfert 2s. They show strong PAH bands and a strong red continuum toward 30 um. The strengths of the high-ionization forbidden narrow emission lines [O IV] 25.89 um, [Ne III] 15.56 um and [Ne V] 14.32 um relative to [Ne II] 12.81 um are weaker in Seyfert 1.8/1.9s and Seyfert 2s as compared to Seyfert 1s. The weakness of high-ionization lines in Seyfert 1.8-1.9s is suggestive of intrinsically weak active galactic nuclei (AGN) continua, and/or stronger star formation activity leading to enhanced [Ne II]. We discuss the implications of these observational results in the context of the Unified Model of AGN.
description: 36 pages, 4 tables, 6 figures, Accepted for publication in The Astrophysical Journal, December 2007
Characteristics of Anemone Active Regions Appearing in Coronal Holes Observed with {\it Yohkoh} Soft X-ray Telescope
Creators: name: Asai, Ayumi
name: Shibata, Kazunari
name: Hara, Hirohisa
name: Nitta, Nariaki V.
Publisher: name: arXiv
Year: 2008
Subjects: subject: Astrophysics (astro-ph)
subject: FOS: Physical sciences

description: Coronal structure of active regions appearing in coronal holes is studied by using the data obtained with the Soft X-Ray Telescope (SXT) aboard {\it Yohkoh} from 1991 November to 1993 March. The following characteristics are found; Many of active regions appearing in coronal holes show a structure that looks like a ``sea-anemone''. Such active regions are called {\it anemone ARs}. About one-forth of all active regions that were observed with SXT from their births showed the anemone structure. For almost all the anemone ARs, the order of magnetic polarities is consistent with the Hale-Nicholson's polarity law. These anemone ARs also showed more or less east-west asymmetry in X-ray intensity distribution, such that the following (eastern) part of the ARs is brighter than its preceding (western) part. This, as well as the anemone shape itself, is consistent with the magnetic polarity distribution around the anemone ARs. These observations also suggest that an active region appearing in coronal holes has simpler (less sheared) and more preceding-spot-dominant magnetic structure than those appearing in other regions.
description: 11 pages, 3 tables, 4 figures