cometadata/datacite-rtg-text-other-reclassification-records huggingface dataset:
Brief an Johann Jacob Frey
Creators: name: Bramhall, John
Publisher: name: [s.n.]
Year: 1634

description: von Joh[n] Derensis
description: Mit Siegel
description: Englisch
description: Verzeichnung=Description=Inventaire Vollständige Rekatalogisierung nach Standortverzeichnis Frey-Gryn Mscr I 4-I 24
Estudio del compuesto para almacenamiento de hidr´ogeno 2LiBH4 −MgH2 con aditivos
Creators: name: Puszkiel, Julián
Publisher: name: Zenodo
Year: 2009
Subjects: Hidrógeno
Almacenamiento
LiBH4-MgH2

description: Uno de los problemas que limitan la aplicaci´on tecnológica del hidrógeno como vector energético es que no se ha desarrollado una manera económica y segura de almacenarlo. Los hidruros se presentan como una posible solución. En estos materiales, el hidrógeno se incorpora como parte de
 su formulación quómica, y es liberado en condiciones adecuadas de presión y temperatura. Por razones tecnol´ogicas, el proceso debe ser reversible, con una cinética que permita completar las reacciones en pocos minutos, a temperaturas moderadas (100 ºC) y a presiones cercanas a la atmosférica.
 Es fundamental que el material presente una elevada capacidad gravimétrica de almacenamiento (superior a 6% p/p de H2) y que sea econ´omico. Un compuesto que cumpla simultáneamente con estos requisitos todavía no ha sido desarrollado. Entre los hidruros con alta capacidad de almacenamiento
 se encuentra el LiBH4 (con 18,4% p/p de H2). Este hidruro es muy estable, por lo que es necesaria una temperatura elevada (400 ºC) para descomponerlo. Sin embargo, al combinarlo con otro material (como MgH2)
 se logra reducir su estabilidad a expensas de una pérdida de capacidad. En este trabajo se realizó un estudio preliminar del compuesto 2LiBH4−MgH2 obtenido por molienda mecánica y del efecto de los aditivos V2O5 y F3Fe. Se midieron las propiedades de absorción y desorción de hidrógeno a diversas temperaturas, complement´andolas con estudios de XRD y SEM. Se obtuvieron muy buenas capacidades reversibles de almacenamiento (10% p/p), aunque los tiempos necesarios para la absorci´on fueron de 30 min. a temperaturas superiores a 350 ºC y a presiones de 6 - 6,5 MPa.
Paratachys Casey 1918
Creators: name: Martinez, Claudia
Publisher: name: Zenodo
Year: 2003
Subjects: Biodiversity
Taxonomy
Animalia
Arthropoda
Insecta
Coleoptera
Carabidae
Paratachys

description: Paratachys Casey, 1918
Comments. Genus of Americas and Old World, with 50 species in all Americas, most of North America and West Indies. First record for Colombia.
Paratachys sp.
Material examined. COLOMBIA. Amazonas: Leticia, [4°12’S] [69°56’W], [82 m], 24­28 ii.1974, S. Peck, leg., IAvH 3066, 3068 (2 ex.); PNN Amacayacu, [3°50’S] [70°30’W], 100 m, varzea, ii.1989, M. Kelsey, leg., IAvH 2277, 2278 (2 ex.); idem, Matamata, 3°41’S 70°15’W, 150 m, Malaise, 19­26.vi.2000, A. Parente, leg., M.684, IAvH 03790 (1 ex.); idem, San Martín, 3°46’S 70°18’W, 150 m, Malaise, 16­23.v.2000, B. Amado, leg., M.691, IAvH 03754 (1 ex.); Arauca: Arauca, [7°05’N] [70°45’W], [124 m], Manual en suelo, 17.vi.1998, H. Jiménez, leg., IAvH 03758, 03762 (2 ex.). Bolívar: SFF Los Colorados, Diana, 9°54’N 75°7’W, 150 m, Malaise, 16­30.xi.2000, E. Deulufeut, leg., M.923, IAvH 03756 (1 ex.). Boyacá: SFF Iguaque, La Planada, 5°25’N 73°27’W, 2850 m, Malaise, 25.vi­13.vii.2000, P. Reina, leg., M.248 IAvH 03537 (1 ex.). Cauca: PNN Gorgona, Mancora, 2°58’N 78°11’W, 60 m, Malaise, 26.vi­18.vii.2000, H. Torres, leg., M.493, IAvH 03753 (1 ex.); idem, 10­26.vi.2000, H. Torres, leg., M.492, IAvH 03755 (1 ex.). Magdalena: PNN Tayrona, Zaino, 11°20’N 74°02’W, 50 m, Malaise, 28.vi.­ 17.vii.2000, R. Henriquez, leg., M.301, IAvH 03766 (1 ex.). Valle del Cauca: PNN Farallones de Cali, 3°26’N 76°48’W, 730 m, Malaise, 18.vii­1.viii.2000, S. Sarria, leg., M.1101, IAvH 03787 (1 ex.); idem, 650 m, Malaise, 13­27 ii.2001, S. Sarria, leg., M.1527, IAvH 03788 (1 ex.); idem, 900 m, Malaise, 1.viii­10.x.2000, S. Sarria, leg., M.1105, IAvH 10956 (1 ex.).
description: Published as part of Martinez, Claudia, 2003, New Records of ground beetles for Colombia (Coleoptera: Carabidae), pp. 1-27 in Zootaxa 250 (1) on page 25, DOI: 10.11646/zootaxa.250.1.1, http://zenodo.org/record/5014257
Study of Fe and Fe–based additives upon the sorption properties of the 2LiBH4 + MgH2 = 2LiH + MgB2 + 4H2 reaction
Creators: name: Puszkiel, Julián
Publisher: name: Zenodo
Year: 2011
Subjects: Fe
hydrogen storage
Reactive hydride composites

description: The reaction 2LiBH4 + MgH2 ↔ MgB2 + 2LiH + 4 H2 presents a suitable thermodynamic stability (ΔH = 40.5 kJ.mol-1 H2) and high theoretical hydrogen gravimetric capacity (11.45 wt% H). The thermodynamics of the reaction predicts a desorption temperature of 225 ºC at 1 bar. Nonetheless, kinetic constraints preclude desorption temperatures below 400 ºC. In order to improve the operative conditions at which the 2LiBH4 + MgH2 reactive hydride composite (RHC) uptake/release hydrogen, we add Fe and Fe-based additives (Fe-isopropoxide, FeF3 and FeCl3) as catalysts. Techniques such as XRD, DSC, TG and Sieverts apparatus as well as synchrotron techniques (XAFS, ASAXS and IN-SITU XRD) have been used in order to evaluate the effect of such additives upon the sorption properties of the RHC. It was found that the Fe-based additives (Fe-isopropoxide, FeF3 and FeCl3) are reduced to Fe by either LiH or LiBH4 during the milling process and hydrogen cycling. This leads to lower hydrogen capacities and the loss of catalytic effect because of the formation of compounds such as LiF and LiCl. The addition of Fe noticeable reduces mainly the desorption times from 12 to 6 hours. However, such effect does not remain upon further cycling. According to the ASAXS results, this effect is related to changes in the microstructure of the material. Moreover, XAFS results suggest that iron boride species might be formed during hydrogen cycling. The evidence obtained from the several techniques contitutes a key factor for the interpretation of the interactions occurring during both milling and hydriding/dehydriding processes.
A mathematical perspective on edge-centric brain functional connectivity
Creators: name: Novelli, Leonardo
name: Razi, Adeel
Publisher: name: arXiv
Year: 2021
Subjects: subject: Neurons and Cognition (q-bio.NC)
subject: Data Analysis, Statistics and Probability (physics.data-an)
subject: FOS: Biological sciences
subject: FOS: Physical sciences

description: Edge time series are increasingly used in brain functional imaging to study the node functional connectivity (nFC) dynamics at the finest temporal resolution while avoiding sliding windows. Here, we lay the mathematical foundations for the edge-centric analysis of neuroimaging time series, explaining why a few high-amplitude cofluctuations drive the nFC across datasets. Our exposition also constitutes a critique of the existing edge-centric studies, showing that their main findings can be derived from the nFC under a static null hypothesis that disregards temporal correlations. Testing the analytic predictions on functional MRI data from the Human Connectome Project confirms that the nFC can explain most variation in the edge FC matrix, the edge communities, the large cofluctuations, and the corresponding spatial patterns. We encourage the use of dynamic measures in future research, which exploit the temporal structure of the edge time series and cannot be replicated by static null models.
Including acoustic modes in the vortex-sheet eigenbasis of a jet
Creators: name: Mancinelli, Matteo
name: Martini, Eduardo
name: Jaunet, Vincent
name: Jordan, Peter
Publisher: name: arXiv
Year: 2021
Subjects: subject: Fluid Dynamics (physics.flu-dyn)
subject: FOS: Physical sciences

description: Vortex-sheet models of jets are widely used to describe the dynamics of modes, such as the Kelvin-Helmholtz instability and guided acoustic waves. However, it is seldom pointed out in the literature the absence of the free-stream acoustic modes in the vortex-sheet spectrum. This indicates that free-stream sound waves are not eigensolutions of the parallel jet. This family of modes is important if, for example, one is interested in problems of sound emission or flow-acoustic interactions. In this work we show how a distantly-confined jet may be used as a surrogate problem for the free jet, in which free-stream acoustic waves appear as a set of discrete modes. Comparing the modes observed in the free jet with those of the distantly-confined jet, we show that, other than the free-stream acoustic modes, the eigenvectors and eigenvalues converge with wall distance. The proposed surrogate problem thus efficiently reproduces the dynamics of the original problem, while allowing to account for the dynamics of free-stream acoustic modes.
description: 9 pages, 13 figures
Brief an Johann Jacob Frey
Creators: name: Cork, Richard Boyle of
Publisher: name: [s.n.]
Year: 1635

description: von Dungarvan
description: Mit Siegel
description: Englisch
description: Verzeichnung=Description=Inventaire Vollständige Rekatalogisierung nach Standortverzeichnis Frey-Gryn Mscr I 4-I 24
Modelling the transfer function of two-dimensional SQUID and SQIF arrays with thermal noise
Creators: name: Labarias, Marc A. Gali
name: Muller, Karl-H.
name: Mitchell, Emma E.
Publisher: name: arXiv
Year: 2021
Subjects: subject: Superconductivity (cond-mat.supr-con)
subject: Mathematical Physics (math-ph)
subject: FOS: Physical sciences

description: We present a theoretical model for 2D SQUID and SQIF arrays with over-damped Josephson junctions for uniform bias current injection at 77 K. Our simulations demonstrate the importance of including Johnson thermal noise and reveal that the mutual inductive coupling between SQUID loops is of minor importance. Our numerical results establish the validity of a simple scaling behaviour between the voltages of 1D and 2D SQUID arrays and show that the same scaling behaviour applies to the maximum transfer functions. The maximum transfer function of a 2D SQUID array can be further optimised by applying the optimal bias current which depends on the SQUID loop self-inductance and the junction critical current. Our investigation further reveals that a scaling behaviour exits between the maximum transfer function of a 2D SQUID array and that of a single dc-SQUID. Finally, we investigate the voltage response of 1D and 2D SQIF arrays and illustrate the effects of adding spreads in the heights and widths of SQUID loops.
description: 9 Figures Submitted to PRB
Sorption behavior of the Mg–Fe–H hydrogen storage system
Creators: name: J, Puszkiel
Publisher: name: Zenodo
Year: 2012
Subjects: Mg–Fe–H
hydrogen storage
Metal hydrides

description: Due to the highest known volumetric hydrogen density (150 kg H2.m-3) and a
 gravimetric hydrogen density of 5.4 wt%, Mg2FeH6 is considered a promising material for hydrogen storage. However, because of the absence of intermetallic compounds between Mg and Fe [1], pure Mg2FeH6 is difficult to synthesize. Hydrogen sorption behavior of the Mg–Fe–H system is investigated via synchrotron XRD, DSC and volumetric techniques. Results show that a 2Mg-Fe stoichiometric mixture can not be totally hydrided, a Mg2FeH6–MgH2 hydride mixture is obtained instead. Upon hydriding MgH2 is a precursor for Mg2FeH6. Upon dehydriding MgH2 and Mg2FeH6 decompose independently. The composition and sorption kinetic
 behavior of the Mg–Fe–H system depends on the temperature and pressure conditions. References
 [1] T. Massalski, Eds., Binary Alloy Phase Diagrams, 2nd edition, American Society for Metals, Metals Park, OH, 1990.
 [2] Puszkiel, J.A., Arneodo Larochette, P., Gennari, F.C., J. Alloys Comp., 463
 (2008)134.
Polyderis Motschulsky 1862
Creators: name: Martinez, Claudia
Publisher: name: Zenodo
Year: 2003
Subjects: Biodiversity
Taxonomy
Animalia
Arthropoda
Insecta
Coleoptera
Carabidae
Polyderis

description: Polyderis Motschulsky, 1862
Comments. Neartic and Neotropical genus, with 13 species distributed in all Americas. First record for Colombia.
Polyderis sp.
Material examined. COLOMBIA. Arauca: Arauca, 6°51’N 70°24’W, [150 m], Manual en suelo, 17.vi.1998, H. Jiménez, leg., IAvH 3778, 3779, 3780 (3 ex.). Cauca: PNN Gorgona, Antigua Laguna, 2º58'N 78º11'W, 70 m, Malaise, 16.viii­5.ix.2000, H. Torres, leg., M.908, IAvH 10957 (1 ex.).
description: Published as part of Martinez, Claudia, 2003, New Records of ground beetles for Colombia (Coleoptera: Carabidae), pp. 1-27 in Zootaxa 250 (1) on page 25, DOI: 10.11646/zootaxa.250.1.1, http://zenodo.org/record/5014257
Brief an [Johann] Jacob Frey
Creators: name: Cork, Richard Boyle of
Publisher: name: [s.n.]
Year: 1635

description: von Dungarvan
description: Siegel
description: Englisch
description: Verzeichnung=Description=Inventaire Vollständige Rekatalogisierung nach Standortverzeichnis Frey-Gryn Mscr I 4-I 24
Brief an Johann Jacob Frey
Creators: name: [s.n.]
Publisher: name: [s.n.]
Year: 1635

description: von Christoph Lüthard
description: Mit Siegel
description: Lateinisch
description: Verzeichnung=Description=Inventaire Vollständige Rekatalogisierung nach Standortverzeichnis Frey-Gryn Mscr I 4-I 24
Naturally restricted subsets of nonsignaling correlations: typicality and convergence
Creators: name: Lin, Pei-Sheng
name: Vértesi, Tamás
name: Liang, Yeong-Cherng
Publisher: name: arXiv
Year: 2021
Subjects: subject: Quantum Physics (quant-ph)
subject: FOS: Physical sciences

description: It is well-known that in a Bell experiment, the observed correlation between measurement outcomes -- as predicted by quantum theory -- can be stronger than that allowed by local causality, yet not fully constrained by the principle of relativistic causality. In practice, the characterization of the set $Q$ of quantum correlations is carried out, often, through a converging hierarchy of outer approximations. On the other hand, some subsets of $Q$ arising from additional constraints [e.g., originating from quantum states having positive-partial-transposition (PPT) or being finite-dimensional maximally entangled (MES)] turn out to be also amenable to similar numerical characterizations. How, then, at a quantitative level, are all these naturally restricted subsets of nonsignaling correlations different? Here, we consider several bipartite Bell scenarios and numerically estimate their volume relative to that of the set of nonsignaling correlations. Within the number of cases investigated, we have observed that (1) for a given number of inputs $n_s$ (outputs $n_o$), the relative volume of both the Bell-local set and the quantum set increases (decreases) rapidly with increasing $n_o$ ($n_s$) (2) although the so-called macroscopically local set $Q_1$ may approximate $Q$ well in the two-input scenarios, it can be a very poor approximation of the quantum set when $n_s>n_o$ (3) the almost-quantum set $\tilde{Q}_1$ is an exceptionally-good approximation to the quantum set (4) the difference between $Q$ and the set of correlations originating from MES is most significant when $n_o=2$, whereas (5) the difference between the Bell-local set and the PPT set generally becomes more significant with increasing $n_o$. This last comparison, in particular, allows us to identify Bell scenarios where there is little hope of realizing the Bell violation by PPT states and those that deserve further exploration.
description: v4: published version (in Quantum); v3: Substantially rewritten, main results summarized in 10 observations, 8 figures, and 7 tables; v2: Results updated; v1: 13 + 4 pages, 10 tables, 5 figures, this is [66] of arXiv:1810.00443; Comments are welcome!
Changing the hydrogenation dehydrogenation pathway of 2LiBH4+MgH2/2LiH+MgB2 via in-situ formed core-shell LixTiO2 nanoparticles.
Creators: name: Puszkiel, Julián
Publisher: name: Zenodo
Year: 2017
Subjects: LixTiO2 nanoparticles
hydrogen storage
Hydrides

description: One of the main constraints for the practical application of hydrogen as an energy carrier is the lack of an efficient and safe hydrogen storage system. Hydrogen storage in solid-state hydrides provides a potential alternative to address these problems. Aiming to improve the hydrogen storage properties of the 2LiBH4+MgH2/2LiH+MgB2 (Li-RHC) system, the effect of the in-situ formation of core-shell nanoparticles LixTiO2 on the Li-RHC is investigated. These nanoparticles markedly enhance the hydrogen storage properties of Li-RHC. This system has a gravimetric hydrogen capacity of about 10 wt. %. The presence of a small amount of LixTiO2 enables the Li-RHC to reversibly store hydrogen through hydrogenation and dehydrogenation periods of just 25 and 50 minutes at 400 ºC, respectively. Upon hydrogenation/dehydrogenation cycling, the in-situ formed core-shell LixTiO2 nanoparticles help refining and preserving the Li-RHC microstructure from coarsening. The kinetic modeling of the hydrogenation reaction shows that the presence of the core-shell LixTiO2 nanoparticles accelerates the one-dimensional interface-controlled mechanism owing to the high Li+ mobility through the LixTiO2 lattice. Upon dehydrogenation, the in-situ formed core-shell LixTiO2 nanoparticles do not modify the dehydrogenation thermodynamic properties of the Li-RHC itself. A new approach based on the combination of two kinetic models evidence that the activation energy of both MgH2 decomposition and MgB2 formation are reduced. The presence of LixTiO2 reduces the time required for the first dehydrogenation of the 2LiBH4+MgH2 by suppressing the side reaction leading from LiBH4 to Li2B12H12, thus enabling the direct formation of MgB2. Moreover, after ten hydrogenation–dehydrogenation cycles starting with the 2LiH+MgB2 the presence of Li2B12H12 is still not observed by Raman spectroscopy. These improvements are due to the novel catalytic mechanism via Li+ source/sink reversible reactions.
Brief an [Johann Jacob Frey?]
Creators: name: Spanheim, Friedrich
Publisher: name: [s.n.]
Year: 1636

description: von [Friedrich I] Spanheim
description: Französisch
description: Verzeichnung=Description=Inventaire Vollständige Rekatalogisierung nach Standortverzeichnis Frey-Gryn Mscr I 4-I 24
Tachys Stephens 1828
Creators: name: Martinez, Claudia
Publisher: name: Zenodo
Year: 2003
Subjects: Biodiversity
Taxonomy
Animalia
Arthropoda
Insecta
Coleoptera
Carabidae
Tachys

description: Tachys Stephens, 1828
Comments. Genus of world distribution, with 15 species in America, widespread in North America, Guatemala, Costa Rica, Ecuador (Islas Galápagos), Argentina, Cuba and Antigua. First record for Colombia.
Tachys sp.
Material examined. COLOMBIA. Arauca: Arauca, [7°05’N] [70°45’W], [124 m], Manual en suelo, 17.vi.1998, H. Jiménez, leg., IAvH 03770, 03771, 03776, 03777 (4 ex.). Chocó: PNN Ensenada de Utria, 6°01’01”N 77°20’55”W, 1993, M. Baena, leg., EU­02, IAvH 2287 (1 ex.)
description: Published as part of Martinez, Claudia, 2003, New Records of ground beetles for Colombia (Coleoptera: Carabidae), pp. 1-27 in Zootaxa 250 (1) on pages 25-26, DOI: 10.11646/zootaxa.250.1.1, http://zenodo.org/record/5014257
Ab Initio Particle-based Object Manipulation
Creators: name: Chen, Siwei
name: Ma, Xiao
name: Lu, Yunfan
name: Hsu, David
Publisher: name: arXiv
Year: 2021
Subjects: subject: Robotics (cs.RO)
subject: Artificial Intelligence (cs.AI)
subject: Machine Learning (cs.LG)
subject: FOS: Computer and information sciences

description: This paper presents Particle-based Object Manipulation (Prompt), a new approach to robot manipulation of novel objects ab initio, without prior object models or pre-training on a large object data set. The key element of Prompt is a particle-based object representation, in which each particle represents a point in the object, the local geometric, physical, and other features of the point, and also its relation with other particles. Like the model-based analytic approaches to manipulation, the particle representation enables the robot to reason about the object's geometry and dynamics in order to choose suitable manipulation actions. Like the data-driven approaches, the particle representation is learned online in real-time from visual sensor input, specifically, multi-view RGB images. The particle representation thus connects visual perception with robot control. Prompt combines the benefits of both model-based reasoning and data-driven learning. We show empirically that Prompt successfully handles a variety of everyday objects, some of which are transparent. It handles various manipulation tasks, including grasping, pushing, etc,. Our experiments also show that Prompt outperforms a state-of-the-art data-driven grasping method on the daily objects, even though it does not use any offline training data.
description: Robotics: Science and Systems (RSS) 2021
Brief an [Johann Jacob] Frey
Creators: name: [s.n.]
Publisher: name: [s.n.]
Year: 1635

description: von Eliza Giffard
description: Siegel
description: Englisch
description: Verzeichnung=Description=Inventaire Vollständige Rekatalogisierung nach Standortverzeichnis Frey-Gryn Mscr I 4-I 24
Efecto del MgB2 dopado sobre las propiedades de almacenamiento del sistema hidruro reactivo 2LiH+MgB2/2LiBH4+MgH2
Creators: name: Puszkiel, J.
Publisher: name: Zenodo
Year: 2013
Subjects: Almacenamiento de hidrógeno
Al
Borohidruros

description: La utilización del H2 como vector de energía se considera como una de las alternativas más viables a la hora de reemplazar a los combustibles convencionales como por ejemplo el petróleo. Sin embargo, uno de los inconvenientes aún no resueltos es la falta de disponibilidad de un medio seguro, compacto y eficiente (en términos de autonomía) para el almacenamiento de hidrógeno principalmente para aplicaciones móviles [1, 2]. Una de las potenciales alternativas para poder superar dicho inconveniente es el almacenamiento de hidrógeno en estado sólido mediante la formación de compuestos denominados hidruros. El sistema hidruro 2LiH+MgB2/2LiBH4+MgH2 presenta interesantes características para el almacenamiento de hidrógeno. Este posee propicia estabilidad termodinámica, lo cual conlleva a una reducida temperatura de liberación de hidrógeno (ΔH = 40,5 kJ.mol-1 H2, Tliberación de hidrógeno = 225 ºC a 1 atm) [3, 4]. También presenta una elevada capacidad de almacenamiento de hidrógeno del 11,45 % p/p H2. A pesar de estas excelentes características, los resultados obtenidos han mostrado que el sistema hidruro absorbe-desorbe reversiblemente cantidades del 9 – 10 % p/p de hidrógeno a una temperatura relativamente elevada de 400 ºC [5]. El MgB2 es el compuesto que hace posible que el sistema hidruro absorba-desorba reversiblemente hidrógeno. Es por ello que se investiga si mediante el dopado del MgB2 con Al es posible disminuir la temperatura de reacción del sistema hidruro 2LiH+MgB2/2LiBH4+MgH2. Referencias
 [1] Schlapbach L., et al., Nature 414 (2001) 353.
 [2] Züttel A., Hydrogen as a Future Energy Carrier. 1ra ed. Weinheim: WILEY-VCH, 2008.
 [3] Barkhordarian G., et al., Patent German pub. no.: DE102004/061286; 2004.
 [4] Vajo JJ., et al.,.J Phys Chem B 109 (2005) 3719.
 [5] Puszkiel J. A. (2012). PhD Thesis, Universidad Nacional de Cuyo, Instituto Balseiro. http://ricabib.cab.cnea.gov.ar/328/
Brief an [Johann] Jacob Frey
Creators: name: Ussher, James
Publisher: name: [s.n.]
Year: 1634

description: von Ja[mes] Armachanus
description: Mit Siegel
description: Englisch
description: Verzeichnung=Description=Inventaire Vollständige Rekatalogisierung nach Standortverzeichnis Frey-Gryn Mscr I 4-I 24
The role of coupling radius in 1D and 2D SQUID and SQIF arrays
Creators: name: Labarias, Marc A. Gali
name: Muller, Karl-H.
name: Mitchell, Emma E.
Publisher: name: arXiv
Year: 2021
Subjects: subject: Superconductivity (cond-mat.supr-con)
subject: Applied Physics (physics.app-ph)
subject: FOS: Physical sciences

description: We investigate theoretically the effect of the coupling radius on the transfer function in 1D and 2D SQUID arrays with different number of Josephson junctions in parallel and series at 77 K. Our results show a plateauing of the array maximum transfer function with the number of junctions in parallel. The plateauing defines the array coupling radius which we show increases with decreasing the normalised impedance of the SQUID loop inductance. The coupling radius is found to be independent of the number of junctions in series. Finally, we investigate the voltage versus magnetic field response and maximum transfer function of one 1D and two 2D SQIF arrays with different SQUID loop area distributions.
Evaporation-driven density instabilities in saturated porous media
Creators: name: Bringedal, Carina
name: Schollenberger, Theresa
name: Pieters, G. J. M.
name: van Duijn, C. J.
name: Helmig, Rainer
Publisher: name: arXiv
Year: 2021
Subjects: subject: Fluid Dynamics (physics.flu-dyn)
subject: Geophysics (physics.geo-ph)
subject: FOS: Physical sciences
subject: 76S05, 76E20, 35P15, 65L60, 65M08

description: Soil salinization is a major cause of soil degradation and hampers plant growth. For soils saturated with saline water, the evaporation of water induces accumulation of salt near the top of the soil. The remaining liquid gets an increasingly larger density due to the accumulation of salt, giving a gravitationally unstable situation, where instabilities in the form of fingers can form. These fingers can hence lead to a net downwards transport of salt. We here investigate the appearance of these fingers through a linear stability analysis and through numerical simulations. The linear stability analysis gives criteria for onset of instabilities for a large range of parameters. Simulations using a set of parameters give information also about the development of the fingers after onset. With this knowledge we can predict whether and when the instabilities occur, and their effect on the salt concentration development near the top boundary.
Brief an [Johann Jacob] Frey
Creators: name: [s.n.]
Publisher: name: [s.n.]
Year: 1635

description: von Charles Cottrell
description: Siegel
description: Englisch
description: Verzeichnung=Description=Inventaire Vollständige Rekatalogisierung nach Standortverzeichnis Frey-Gryn Mscr I 4-I 24
On $SU(2)_{CS}$-like groups and invariance of the fermionic action in QCD
Creators: name: Catillo, Marco
Publisher: name: arXiv
Year: 2021
Subjects: subject: High Energy Physics - Lattice (hep-lat)
subject: FOS: Physical sciences

description: In this work, we introduce some new $U(1)$ symmetry groups of the free fermionic action in euclidean space-time, which are a consequence of parity and time-reversal symmetries. Afterwards, we discuss how the introduction of a gauge interaction affects the invariance of the action, with special reference to QCD. Moreover, inspired by recent QCD lattice results of \textit{Glozman et al.}, in which an interesting and unexpected symmetry group has been observed, namely $SU(2)_{CS}$ (that contains $U(1)_A$ as subgroup), we build other $SU(2)_{CS}$-like groups in euclidean space-time using the previous introduced $U(1)$ groups. Finally we argue about the possible invariance of the fermionic action with respect these new $SU(2)_{CS}$-like groups and its consequence on the hadron temporal correlators.
description: 21 pages + appendices
Clinidium (Clinidium) mathani Grouvelle 1903
Creators: name: Martinez, Claudia
Publisher: name: Zenodo
Year: 2003
Subjects: Biodiversity
Taxonomy
Animalia
Arthropoda
Insecta
Coleoptera
Carabidae
Clinidium
Clinidium mathani

description: Clinidium (Clinidium) mathani Grouvelle, 1903
Material examined. COLOMBIA. Caquetá: PNN Cordillera de los Picachos, 2°47’51”N 74°51’18”W, 1775 m, Manual, xi.1997, F. Escobar & E. González, leg., IAvH 2241 (1 ex.).
Comments. Species is known from Brazil. First record for Colombia.
description: Published as part of Martinez, Claudia, 2003, New Records of ground beetles for Colombia (Coleoptera: Carabidae), pp. 1-27 in Zootaxa 250 (1) on page 26, DOI: 10.11646/zootaxa.250.1.1, http://zenodo.org/record/5014257
Brief an [Johann Jacob Frey]
Creators: name: [s.n.]
Publisher: name: [s.n.]
Year: 1636

description: von Tho[mas] Littell
description: Englisch
description: Verzeichnung=Description=Inventaire Vollständige Rekatalogisierung nach Standortverzeichnis Frey-Gryn Mscr I 4-I 24
Achieving Zero Constraint Violation for Constrained Reinforcement Learning via Primal-Dual Approach
Creators: name: Bai, Qinbo
name: Bedi, Amrit Singh
name: Agarwal, Mridul
name: Koppel, Alec
name: Aggarwal, Vaneet
Publisher: name: arXiv
Year: 2021
Subjects: subject: Machine Learning (cs.LG)
subject: FOS: Computer and information sciences

description: Reinforcement learning is widely used in applications where one needs to perform sequential decisions while interacting with the environment. The problem becomes more challenging when the decision requirement includes satisfying some safety constraints. The problem is mathematically formulated as constrained Markov decision process (CMDP). In the literature, various algorithms are available to solve CMDP problems in a model-free manner to achieve $ε$-optimal cumulative reward with $ε$ feasible policies. An $ε$-feasible policy implies that it suffers from constraint violation. An important question here is whether we can achieve $ε$-optimal cumulative reward with zero constraint violations or not. To achieve that, we advocate the use of randomized primal-dual approach to solve the CMDP problems and propose a conservative stochastic primal-dual algorithm (CSPDA) which is shown to exhibit $\tilde{\mathcal{O}}\left(1/ε^2\right)$ sample complexity to achieve $ε$-optimal cumulative reward with zero constraint violations. In the prior works, the best available sample complexity for the $ε$-optimal policy with zero constraint violation is $\tilde{\mathcal{O}}\left(1/ε^5\right)$. Hence, the proposed algorithm provides a significant improvement as compared to the state of the art.
description: This paper is the arXiv version with Appendices of the published AAAI paper: "Achieving Zero Constraint Violation for Constrained Reinforcement Learning via Primal-Dual Approach," in Proc. AAAI, Feb 2022. The paper has been further extended with concave utilities and constraints in v2
Brief an [Johann Jacob] Frey
Creators: name: Cork, Richard Boyle of
Publisher: name: [s.n.]
Year: 1635

description: von Dungarvan
description: Mit Siegel
description: Englisch
description: Verzeichnung=Description=Inventaire Vollständige Rekatalogisierung nach Standortverzeichnis Frey-Gryn Mscr I 4-I 24
Brief an [Johann] Jacob Frey
Creators: name: Ussher, James
Publisher: name: [s.n.]
Year: 1635

description: von Ja[mes] Armachanus
description: Englisch
description: Verzeichnung=Description=Inventaire Vollständige Rekatalogisierung nach Standortverzeichnis Frey-Gryn Mscr I 4-I 24
Clinidium (Clinidium) spatulatum Bell & Bell 1985
Creators: name: Martinez, Claudia
Publisher: name: Zenodo
Year: 2003
Subjects: Biodiversity
Taxonomy
Animalia
Arthropoda
Insecta
Coleoptera
Carabidae
Clinidium
Clinidium spatulatum

description: Clinidium (Clinidium) spatulatum Bell & Bell, 1985
Material examined. COLOMBIA. Cauca: PNN Gorgona, [100 m], 1990, M.L. Baena, leg., IAvH 2968 (1 ex.).
Comments. Species is known from Panamá. First record for Colombia and South America.
description: Published as part of Martinez, Claudia, 2003, New Records of ground beetles for Colombia (Coleoptera: Carabidae), pp. 1-27 in Zootaxa 250 (1) on page 26, DOI: 10.11646/zootaxa.250.1.1, http://zenodo.org/record/5014257
Tuna-AI: tuna biomass estimation with Machine Learning models trained on oceanography and echosounder FAD data
Creators: name: Precioso, Daniel
name: Navarro-García, Manuel
name: Gavira-O'Neill, Kathryn
name: Torres-Barrán, Alberto
name: Gordo, David
name: Gallego-Alcalá, Victor
name: Gómez-Ullate, David
Publisher: name: arXiv
Year: 2021
Subjects: subject: Machine Learning (stat.ML)
subject: Machine Learning (cs.LG)
subject: FOS: Computer and information sciences

description: Echo-sounder data registered by buoys attached to drifting FADs provide a very valuable source of information on populations of tuna and their behaviour. This value increases whenthese data are supplemented with oceanographic data coming from CMEMS. We use these sources to develop Tuna-AI, a Machine Learning model aimed at predicting tuna biomass under a given buoy, which uses a 3-day window of echo-sounder data to capture the daily spatio-temporal patterns characteristic of tuna schools. As the supervised signal for training, we employ more than 5000 set events with their corresponding tuna catch reported by the AGAC tuna purse seine fleet.
Investigations on the hydrogen storage properties of novel lithium hydride composite systems
Creators: name: Puszkiel, J.
Publisher: name: Zenodo
Year: 2015
Subjects: lithium hydride composite systems
hydrogen storage

description: Hydrogen is regarded as a promising energy carrier for the current and future energetic and environmental problems. One of the main constraints for the practical application of hydrogen as energy carrier is the lack of an efficient and safe hydrogen storage system. Hydrogen storage in solid state through hydride compounds formation (MHx, M: Metal, H: Hydrogen) provides a potential alternative to address these problems. In this work, fundamental aspects of the physical chemistry of novel lithium hydride systems: Li-BMg-N, Li-B-Mg-Cu and Li-B-Mg-Zn are investigated. These systems are prepared via mechanical milling using as starting materials mixtures composed of MgB2+LizXy (X: Metal or Non-Metal). In order to understand reaction mechanism of these lithium hydride composite systems, experimental techniques such as thermogravimetry combined with differential temperature analysis and coupled with mass spectroscopy (TG-DTS-MS), exsitu and in-situ XRD and titration measurements are utilized. The Li-B-Mg-N and Li-BMg- Cu systems show the presence of crystalline LiBH4 after the first hydrogenation at 50 bar and 400 ºC. Hydrogen release for both systems is noticed at temperatures of about 300 ºC and 100 ºC upon the first and second non-isothermal dehydrogenation,
 respectively. Li-B-Mg-N system exhibits about 5 wt. % of reversible hydrogen storage capacity. LiBH4 and an amorphous Li-B-N-H containing phase are the reversible hydride compounds.
Design of an optimized hybrid hydrogen storage reservoir with high capacity
Creators: name: Puszkiel, J.
Publisher: name: Zenodo
Year: 2020
Subjects: hybrid hydrogen storage reservoir
hydrogen storage
RT hydride
High-pressure

description: The commercial use of hydrogen as a fuel, especially for the transportation sector, is still precluded by the lack of a cost effective, efficient and safe method to store and deliver hydrogen. It is still a challenge to find a suitable hydrogen reservoir for the environmentally friendly fuel cell powered vehicles, or at least to reach an optimum trade-off between the requirements and the optimization of a method. In this regard, an alternative is the combination of a hydrogen pressure tank and hydride compounds. This hybrid method benefits from less severe hydrogen pressure conditions, easiness of thermal management and the further densification of hydrogen, increasing the volumetric capacity, owing to the presence of a hydride compound. In this work, we present the conceptual design of an optimized hybrid tank for 0.5 kg H2 to operate at room temperature and pressures between 10 and 350 bar of H2. Laboratory experimental results for an AB2 type material with high equilibrium pressures and adequate capacity leads to an optimized trade-off between hydrogen capacity, thermal management and cost of the hybrid tank as a whole. The full thermodynamic, kinetic and microstructural characterization of the hydride forming material allows the prediction of the tank’s behavior based on finite elements simulations. Moreover, investigations on different alternatives to the traditional type III and IV reinforced vessels for high pressure are also shown.
Statistical limits for quantum networks with semiconductor entangled photon sources
Creators: name: Yang, Jingzhong
name: Zopf, Michael
name: Li, Pengji
name: Sharma, Nand Lal
name: Nie, Weijie
name: Benthin, Frederik
name: Fandrich, Tom
name: Rugeramigabo, Eddy Patrick
name: Hopfmann, Caspar
name: Keil, Robert
name: Schmidt, Oliver G.
name: Ding, Fei
Publisher: name: arXiv
Year: 2021
Subjects: subject: Quantum Physics (quant-ph)
subject: Mesoscale and Nanoscale Physics (cond-mat.mes-hall)
subject: Materials Science (cond-mat.mtrl-sci)
subject: Optics (physics.optics)
subject: FOS: Physical sciences

description: Semiconductor quantum dots are promising building blocks for quantum communication applications. Although deterministic, efficient, and coherent emission of entangled photons has been realized, implementing a practical quantum repeater remains outstanding. Here we explore the statistical limits for entanglement swapping with sources of polarization-entangled photons from the commonly used biexciton-exciton cascade. We stress the necessity of tuning the exciton fine structure, and explain why the often observed time evolution of photonic entanglement in quantum dots is not applicable for large quantum networks. We identify the critical, statistically distributed device parameters for entanglement swapping based on two sources. A numerical model for benchmarking the consequences of device fabrication, dynamic tuning techniques, and statistical effects is developed, in order to bring the realization of semiconductor-based quantum networks one step closer to reality.
description: 9 pages, 4 figures
Fracton Topological Order at Finite Temperature
Creators: name: Shen, Xiaoyang
name: Wu, Zhengzhi
name: Li, Linhao
name: Qin, Zhehan
name: Yao, Hong
Publisher: name: arXiv
Year: 2021
Subjects: subject: Strongly Correlated Electrons (cond-mat.str-el)
subject: Statistical Mechanics (cond-mat.stat-mech)
subject: High Energy Physics - Theory (hep-th)
subject: Quantum Physics (quant-ph)
subject: FOS: Physical sciences

description: As new kinds of stabilizer code models, fracton models have been promising in realizing quantum memory or quantum hard drives. However, it has been shown that the fracton topological order of 3D fracton models occurs only at zero temperature. In this Letter, we show that higher dimensional fracton models can support a fracton topological order below a nonzero critical temperature $T_c$. Focusing on a typical 4D X-cube model, we show that there is a finite critical temperature $T_c$ by analyzing its free energy from duality. We also obtained the expectation value of the 't Hooft loops in the 4D X-cube model, which directly shows a confinement-deconfinement phase transition at finite temperature. This finite-temperature phase transition can be understood as spontaneously breaking the $\mathbb{Z}_2$ one-form subsystem symmetry. Moreover, we propose a new no-go theorem for finite-temperature quantum fracton topological order.
description: 4.5 pages+ references + supplemental material, 4 figures; v2: added references; minor improvements
Brief an Johann Jacob Frey
Creators: name: Clifford, Frances
Publisher: name: [s.n.]
Year: 1635

description: von [Lady] F[rances] Clifford
description: Siegel
description: Englisch
description: Verzeichnung=Description=Inventaire Vollständige Rekatalogisierung nach Standortverzeichnis Frey-Gryn Mscr I 4-I 24
Stratiotes Putzeys 1846
Creators: name: Martinez, Claudia
Publisher: name: Zenodo
Year: 2003
Subjects: Biodiversity
Taxonomy
Animalia
Arthropoda
Insecta
Coleoptera
Carabidae
Stratiotes

description: Stratiotes Putzeys, 1846
Comments. Neotropical genus, with three species known from Brazil, French Guiana, Martinica and Dominica. First record for Colombia.
Stratiotes batesi Putzeys, 1866
Material examined. COLOMBIA. Nariño: Jardines de Sucumbios, Territorio Kofán, 0°30’07”N 77°13’43”W, 700 m, manual nocturno, 27.ix.1998, E. González, leg., IAvH 2227 (1 ex.); idem, Winkler, 28.ix.1998, E. González, leg., IAvH 2226 (1 ex.).
Comments. Species only known from Brazil. First record for Colombia.
Stratiotes spp.
Material examined. COLOMBIA. Bolívar: Zambrano, Hda. Monterrey Forestal, borde bosque Chile, Bosque Seco Tropical 2 rio, 9°37’48”N 74°54’44”W, 70 m, Pitfall #10, 20.viii.1993, F. Fernández & G. Ulloa, leg., IAvH 2168 (1 ex.). Vichada: Gaviotas, 4°33’48”N 70°55’18”W, 180 m, 1984, F. Fernández, leg., IAvH 2213 (1 ex.).
description: Published as part of Martinez, Claudia, 2003, New Records of ground beetles for Colombia (Coleoptera: Carabidae), pp. 1-27 in Zootaxa 250 (1) on page 26, DOI: 10.11646/zootaxa.250.1.1, http://zenodo.org/record/5014257
Stability of (eventually) positive semigroups on spaces of continuous functions
Creators: name: Arora, Sahiba
name: Glück, Jochen
Publisher: name: arXiv
Year: 2021
Subjects: subject: Functional Analysis (math.FA)
subject: FOS: Mathematics
subject: 47D06, 47B65, 47A10

description: We present a new and very short proof of the fact that, for positive $C_0$-semigroups on spaces of continuous functions, the spectral and the growth bound coincide. Our argument, inspired by an idea of Vogt, makes the role of the underlying space completely transparent and also works if the space does not contain the constant functions - a situation in which all earlier proofs become technically quite involved. We also show how the argument can be adapted to yield the same result for semigroups that are only eventually positive rather than positive.
description: 5 pages. This is version 2; minor changes compared to v1
Wind-Induced Changes to Shoaling Surface Gravity Wave Shape
Creators: name: Zdyrski, Thomas
name: Feddersen, Falk
Publisher: name: arXiv
Year: 2021
Subjects: subject: Fluid Dynamics (physics.flu-dyn)
subject: FOS: Physical sciences

description: Unforced shoaling waves experience growth and changes to wave shape. Similarly, wind-forced waves on a flat-bottom likewise experience growth/decay and changes to wave shape. However, the combined effect of shoaling and wind-forcing on wave shape, particularly relevant in the near-shore environment, has not yet been investigated theoretically. Here, we consider small-amplitude, shallow-water solitary waves propagating up a gentle, planar bathymetry forced by a weak, Jeffreys-type wind-induced surface pressure. We derive a variable-coefficient Korteweg-de Vries-Burgers (vKdV-B) equation governing the wave profile's evolution and solve it numerically using a Runge-Kutta third-order finite difference solver. The simulations run until convective prebreaking -- a Froude number limit appropriate to the order of the vKdV-B equation. Offshore winds weakly enhance the ratio of prebreaking height to depth as well as prebreaking wave slope. Onshore winds have a strong impact on narrowing the wave peak, and wind also modulates the rear shelf formed behind the wave. Furthermore, wind strongly affects the width of the prebreaking zone, with larger effects for smaller beach slopes. After converting our pressure magnitudes to physically realistic wind speeds, we observe qualitative agreement with prior laboratory and numerical experiments on breakpoint location. Additionally, our numerical results have qualitatively similar temporal wave shape to shoaling and wind-forced laboratory observations, suggesting that the vKdV-B equation captures the essential aspects of wind-induced effects on shoaling wave shape. Finally, we isolate the wind's effect by comparing the wave profiles to the unforced case. This reveals that the numerical results are approximately a superposition of a solitary wave, a shoaling-induced shelf, and a wind-induced, bound, dispersive, and decaying tail.
description: Added discussion of asymptotic regime (section 2F), discussion of perturbed KdV (section 4B), and minor corrections; 23 pages, 10 figures
Brief an [Johann Jacob] Frey
Creators: name: Strafford, Thomas Wentworth of
Publisher: name: [s.n.]
Year: 1635

description: von [Thomas] Wentworth
description: Englisch
description: Verzeichnung=Description=Inventaire Vollständige Rekatalogisierung nach Standortverzeichnis Frey-Gryn Mscr I 4-I 24
Understanding the thermodynamics and kinetics of the Mg–Fe–H system.
Creators: name: Puszkiel, J.
Publisher: name: Zenodo
Year: 2008
Subjects: Mg–Fe–H
hydrogen storage
complex hydrides

description: For many years researchers have been trying to tailor a solid material to store hydrogen in a safe and economic way. Among the hitherto potential solid storage media known, we can find the complex hydrides [1,2]. One of the deemed attractive alternatives
 is the transition metal complex hydride Mg2FeH6. It posessess the highest known volumetric hydrogen density of 150 kg H2.m-3 and has a high gravimetric hydrogen density of 5.47 wt%. On the other hand, it also presents many constraints as its high
 stability (ΔH = - 87 ± 3 kJ.mol-1 H2 [3]), low heat transfer and difficulties in its synthesis. However, the information gleaned from deeper investigations can make possible a better understanding of the material behavior and how to improve it. In the present work the thermodynamics and kinetics of the Mg–Fe based hydride materials obtained via two different synthesis procedures is assessed. Mg–Fe based hydride materials are synthesized by mechanical milling in argon atmosphere (MM) and reactive mechanical milling in hydrogen atmosphere (RMM) using Mg2Fe stoichiometric mixture of powders as starting material. Thermodynamics of the Mg–Fe–H hydride system is evaluated by pressure-composition isotherms (PCI) measurements in the temperature range of 573 K to 673 K. It is found that the synthesis process has no influence on the thermodynamic of the synthesized hydride material, since both materials practically present the same thermodynamic parameters. The dependence of the hydrogen uptake rates on the pressure and temperature is also analyzed. The hydrogen uptake rate shows noticeable differences in the measured pressure (500 – 6500 kPa) and temperature (573 K – 673 K) ranges. At 623 K the sample obtained by MM presents higher hydrogen capacity and absorbs hydrogen faster than the sample synthesized via RMM. Nevertheless, at 673 K the rate of hydrogen uptake of the former sample is slower than the rate of the latter. Therefore, the synthesis procedure applied has influence on the kinetic behavior of the Mg–Fe–H hydride system. Moreover, we also characterized samples with other compositions, viz. Mg15Fe and Mg3Fe obtained via RMM. It is proved that even changing the composition, the thermodynamics is not affected. However, both the kinetics and the hydrogen absorption capacity are significantly modified. References
 1. L. Schlapbach and A. Züttel, Nature 414 (2001) 353-358.
 2. A. Seayad, D. M. Antonelli, Adv. Mater. 16 [9-10] (2004) 765-777.
 3. J. A. Puszkiel, P. Arneodo Larochette, F. C. Gennari. Int J Hydrogen Energy (2008),
 doi:10.1016/j.ijhydene.2007.11.030.
Cavity Quantum Electrodynamics Effects with Nitrogen Vacancy Center Spins in Diamond and Microwave Resonators at Room Temperature
Creators: name: Zhang, Yuan
name: Wu, Qilong
name: Su, Shi-Lei
name: Lou, Qing
name: Shan, ChongXin
name: Mølmer, Klaus
Publisher: name: arXiv
Year: 2021
Subjects: subject: Quantum Physics (quant-ph)
subject: Atomic Physics (physics.atom-ph)
subject: FOS: Physical sciences

description: Cavity quantum electrodynamics (C-QED) effects, such as Rabi splitting, Rabi oscillations and superradiance, have been demonstrated with nitrogen vacancy center spins in diamond in microwave resonators at cryogenic temperature. In this article we explore the possibility to realize strong collective coupling and the resulting C-QED effects with ensembles of spins at room temperature. Thermal excitation of the individual spins by the hot environment leads to population of collective Dicke states with low symmetry and a reduced collective spin-microwave field coupling. However, we show with simulations that the thermal excitation can be compensated by spin-cooling via optical pumping. The resulting population of Dicke states with higher symmetry implies strong coupling with currently available high-quality resonators and enables C-QED effects at room temperature with potential applications in quantum sensing and quantum information processing.
description: 9 pages, 6 figures