cometadata/datacite-rtg-text-other-reclassification-records huggingface dataset:
Mid-IR-laser microscopy as a tool for defect investigation in bulk semiconductors
Creators: name: Astafiev, O. V.
name: Kalinushkin, V. P.
name: Yuryev, V. A.
Publisher: name: arXiv
Year: 2011
Subjects: subject: Materials Science (cond-mat.mtrl-sci)
subject: Mesoscale and Nanoscale Physics (cond-mat.mes-hall)
subject: Optics (physics.optics)
subject: FOS: Physical sciences

description: A non-destructive optical technique described in this paper is an effective new tool for the investigation of defects in semiconductors. The basic instrument for this technique---a mid-IR-laser microscope---being sensitive to accumulations of free carriers enables the study of both accumulations of electrically-active defects or impurities in bulk semiconductors and doped domains in semiconductor structures. The optical beam induced scattering mode of this microscope is designed for the investigation of recombination-active defects but unlike EBIC it requires neither Schottky barrier or p--n junction nor special preparation of samples
description: 9-th Int. Conf. on Microscopy of Semiconducting Materials, Oxford, UK, 20-23 March 1995
The role of DHHC5-mediated palmitoylation of delta-catenin in cadherin stability and synapse plasticity
Creators: name: Brigidi, Gian Stefano
Publisher: name: University of British Columbia
Year: 2015

description: Synapses of the Central Nervous System are specialized junctions of cell-cell contact that transmit signals from one neuron to another in a rapid and efficient manner. Synapses are highly plastic structures that can be continually modified in response to fluctuations in neuronal activity. Changes in the number, size, and protein composition of synapses have been observed following alterations in neuronal activity in vitro and following the learning of specific tasks in vivo. Thus, elucidating the molecular mechanisms underlying activity-mediated trafficking of proteins to and from synaptic compartments is essential for our understanding of brain function. Previous work has demonstrated a requirement for the cadherin-adhesion complex in activity-induced enhancements in synapse strength, however the molecular mechanisms that translate synaptic activation into enhanced cadherin-based adhesion and synapse strengthening remain unknown. This dissertation discusses work that unravels how synaptic activity coordinates the enhancement of cadherin surface stabilization, enlargement of dendritic spines, and increased surface insertion of AMPA receptors. This work demonstrates that increased synaptic activity enhances the palmitoylation of a brain-specific component of the cadherin-adhesion complex, δ-catenin, which in turn causes δ-catenin to traffic toward the synaptic membrane in spines where it associates with and stabilizes surface N-cadherin. This results in enhancements in synapse structure and efficacy, and is correlated with the acquisition of contextual fear memories. Furthermore, we show that palmitoylation of δ-catenin is mediated by the palmitoyl acyl-transferase DHHC5, and that DHHC5 drives activity-induced increases in surface AMPA receptor levels through the palmitoylation of δ-catenin. Finally, we demonstrate that the activity-induced palmitoylation of δ-catenin by DHHC5 is accomplished through the rapid trafficking of DHHC5 out of the synapse and into the dendritic shaft where it can associate with and palmitoylate δ-catenin, resulting in δ-catenin’s synaptic recruitment. This work provides new insights into the cellular and molecular mechanisms that underlie activity-induced synapse plasticity.
Geometry-induced localization of thermal fluctuations in ultrathin superconducting structures
Creators: name: Pogosov, W. V.
name: Misko, V. R.
name: Peeters, F. M.
Publisher: name: arXiv
Year: 2010
Subjects: subject: Superconductivity (cond-mat.supr-con)
subject: FOS: Physical sciences

description: Thermal fluctuations of the order parameter in an ultrathin triangular shaped superconducting structure are studied near $T_{c}$, in zero applied field. We find that the order parameter is prone to much larger fluctuations in the corners of the structure as compared to its interior. This geometry-induced localization of thermal fluctuations is attributed to the fact that condensate confinement in the corners is characterised by a lower effective dimensionality, which favors stronger fluctuations.
description: 9 pages, 5 figures
Human Rights Education: An Evaluation of the Promotional Mandate of the Commission on Human Rights and Administrative Justice (CHRAJ).
Creators: name: Sondem, Stephen Kofi
Publisher: name: KNUST Law Journal
Year: 2018

description: This paper examines the promotional role of the Commission on Human Rights and Administrative Justice (CHRAJ) in public education. Drawing primarily on interviews and the annual reports of the Commission, the paper provides an in-depth understanding of the working methods and strategies of the Commission in fulfilling its promotional mandate. The evidence provided here is distinctive, because it is the first empirical study that examines in a holistic manner and in detail the work of the Commission in public education. It has been possible to analyze the primary data in the context of a growing academic literature concerning the potential of national human rights institutions, broadly defined, to fulfill a promotional mandate. The overall conclusion of the paper is that, the CHRAJ has achieved some commendable successes.
description: KNUST Law Journal, Vol 7 (2017): KNUST Law Journal
Light quark mass dependence of the $D$ and $D_s$ decay constants
Creators: name: Geng, L. S.
name: Altenbuchinger, M.
name: Weise, W.
Publisher: name: arXiv
Year: 2010
Subjects: subject: High Energy Physics - Phenomenology (hep-ph)
subject: High Energy Physics - Lattice (hep-lat)
subject: FOS: Physical sciences

description: We study the light quark mass dependence of the $D$ and $D_s$ meson decay constants, $f_D$ and $f_{D_s}$, using a covariant formulation of chiral perturbation theory ($χ$PT) at next-to-next-to-leading order (NNLO). Using the HPQCD lattice results for the $D$($D_s$) decay constants as a benchmark we show that covariant $χ$PT can describe the HPQCD results better than heavy meson $χ$PT (HM$χ$PT) at both NLO and NNLO. Within the same framework, taking into account sub-leading ($1/m_Q$, with $m_Q$ the heavy quark mass) corrections to the values of the low-energy constants and employing the lattice QCD results for $g_{BB^*π}$, we estimate the ratio of $f_{B_s}/f_B$ to be $1.22^{+0.05}_{-0.04}$, which agrees well with the HPQCD result $1.226(26)$.
description: 16 pages, 4 figures
Reconciling results of 2019 and 2020 stellar occultations on Pluto's atmosphere. New constraints from both the 5 September 2019 event and consistency analysis
Creators: name: Yuan, Ye
name: Li, Fan
name: Fu, Yanning
name: Chen, Jian
name: Tan, Wei
name: Zhang, Shuai
name: Zhang, Wei
name: Zhang, Chen
name: Zhang, Qiang
name: Ye, Jiahui
name: Li, Delai
name: Zhu, Yijing
name: Fu, Zhensen
name: Zhu, Ansheng
name: Chen, Yue
name: Xu, Jun
name: Zhang, Yang
Publisher: name: arXiv
Year: 2023
Subjects: subject: Earth and Planetary Astrophysics (astro-ph.EP)
subject: FOS: Physical sciences

description: A stellar occultation by Pluto on 5 September 2019 yielded positive detections at two separate stations. Using an approach consistent with comparable studies, we derived a surface pressure of $11.478 \pm 0.55~\mathrm{μbar}$ for Pluto's atmosphere from the observations of this event. In addition, to avoid potential method inconsistancies highlighted by Sicardy et al. when comparing with historical pressure measurements, we reanalyzed the data by 15 August 2018 and 17 July 2019 events, respectively. All the new measurements provide a bridge between the two different perspectives on the pressure variation since 2015: a rapid pressure drop from previous studies of the 15 August 2018 and 17 July 2019 events and a plateau phase from that of the 6 June 2020 event. The pressure measurement from the 5 September 2019 event aligns with those from 2016, 2018, and 2020, supporting the latter perspective. While the measurements from the 4 June 2011 and 17 July 2019 events suggest probable V-shaped pressure variations unaccounted for by the volatile transport model (VTM) from Meza et al., the VTM remains applicable on average. And, the validity of the V-shaped variations is debatable due to the stellar faintness of the 4 June 2011 event and the grazing single-chord geometry of the 17 July 2019 event. To reveal and understand all significant pressure variations of Pluto's atmosphere, it is essential to provide constraints on both short-term and long-term evolutions of the interacting atmosphere and surface by continuous pressure monitoring through occultation observations, whenever possible, complemented by frequent spectroscopy and photometry of the surface.
description: Astronomy & Astrophysics, in press. 10 pages, 6 figures
Close-to-fission dumbbell Jupiter-Trojan (17365) Thymbraeus
Creators: name: Carry, B.
name: Descamps, P.
name: Ferrais, M.
name: Rivet, J. -P.
name: Berthier, J.
name: Jehin, E.
name: Vernet, D.
name: Abe, L.
name: Bendjoya, P.
name: Vachier, F.
name: Pajuelo, M.
name: Birlan, M.
name: Colas, F.
name: Benkhaldoun, Z.
Publisher: name: arXiv
Year: 2023
Subjects: subject: Earth and Planetary Astrophysics (astro-ph.EP)
subject: FOS: Physical sciences

description: Every population of small bodies in the Solar system contains a sizable fraction of multiple systems. Among these, the Jupiter Trojans have the lowest number of known binary systems and the least characterized. We aim at characterizing the reported binary system (17365) Thymbraeus, one of the only seven multiple systems known among Jupiter Trojans. We conducted light curves observing campaigns in 2013, 2015, and 2021 with ground-based telescopes. We model these lightcurves using dumbbell equilibrium figures. We show that Thymbraeus is unlikely a binary system. Its light curves are fully consistent with a bilobated shape: a dumbbell equilibrium figure. We determine a low density of 830 +/- 50 kg.m-3 , consistent with the reported density of other Jupiter Trojan asteroids and small Kuiper-belt objects. The angular velocity of Thymbraeus is close to fission. If separated, its components would become a similarly-sized double asteroid such as the other Jupiter Trojan (617) Patroclus.
description: accepted for publication in A&A
Leuctra paleo Poulton & Stewart 1991
Creators: name: Harrison, Audrey B.
name: Stark, Bill P.
Publisher: name: Zenodo
Year: 2010
Subjects: Biodiversity
Taxonomy
Animalia
Arthropoda
Insecta
Plecoptera
Leuctridae
Leuctra
Leuctra paleo

description: Leuctra paleo Poulton & Stewart (Figs. 45-50) Leuctra paleo Poulton & Stewart, 1991:22. Holotype ♂ (USNM), tributary Smackover Creek, Hwy 98, 8.8 km E McNeil, Columbia Co., Arkansas Material examined. Arkansas: Columbia Co., tributary Spring Branch, Hwy 98, 5.3 km NE McNeil, T16 S, R20 W, Sec 11, 12 October 1997, R. E. DeWalt, B. Stark, 24♂, 34♀ (INHS). Dallas Co., Campground Creek, Ben Few Campground, 2 km WSW Princeton, T8 S, R15 W, Sec 32, 12 October 1997, R.E. DeWalt, B. Stark, 5♂, 9♀ (INHS). Comments. The specimens examined in this study are from a site near the type locality and an additional site in Dallas County near the site where paratypes were collected (Poulton & Stewart 1991). The major difference in males of this species and L. szczytkoi is in the tergal lobes of segment 8 (Figs. 50, 56).
description: Published as part of Harrison, Audrey B. & Stark, Bill P., 2010, Two New Species Of Stoneflies In The Leuctra Ferruginea Group (Plecoptera: Leuctridae), With Notes On The Leuctra Species Known For Mississippi And Alabama, U. S. A., pp. 16-33 in Illiesia 6 (3) on page 28, DOI: 10.5281/zenodo.4759571
description: {"references": ["Poulton, B. C. & K. W. Stewart. 1991. The stoneflies of the Ozark and Ouachita Mountains (Plecoptera). Memoirs of the American Entomological Society, 38: 1 - 116."]}
Millimetre and submillimetre spectroscopy of isobutene and its detection in the molecular cloud G+0.693
Creators: name: Fatima, Mariyam
name: Müller, Holger S. P.
name: Zingsheim, Oliver
name: Lewen, Frank
name: Rivilla, Víctor M.
name: Jiménez-Serra, Izaskun
name: Martín-Pintado, Jesús
name: Schlemmer, Stephan
Publisher: name: arXiv
Year: 2023
Subjects: subject: Astrophysics of Galaxies (astro-ph.GA)
subject: Instrumentation and Methods for Astrophysics (astro-ph.IM)
subject: Atomic and Molecular Clusters (physics.atm-clus)
subject: Chemical Physics (physics.chem-ph)
subject: FOS: Physical sciences

description: Isobutene ((CH$_3$)$_2$C=CH$_2$) is one of the four isomers of butene (C$_4$H$_8$). Given the detection of propene (CH$_3$CH=CH$_2$) toward TMC-1, and also in the warmer environment of the solar-type protostellar system IRAS 16293$-$2422, one of the next alkenes, isobutene, is a promising candidate to be searched for in space. We aim to extend the limited line lists of the main isotopologue of isobutene from the microwave to the millimetre region in order to obtain a highly precise set of rest frequencies and to facilitate its detection in the interstellar medium. We investigated the rotational spectrum of isobutene in the 35$-$370 GHz range using absorption spectroscopy at room temperature. Quantum-chemical calculations were carried out to evaluate vibrational frequencies. We determined new or improved spectroscopic parameters for isobutene up to a sixth-order distortion constant. These new results enabled its detection in the G+0.693 molecular cloud for the first time, where propene was also recently found. The propene to isobutene column density ratio was determined to be about 3:1. The observed spectroscopic parameters for isobutene are sufficiently accurate that calculated transition frequencies should be reliable up to 700 GHz. This will further help in observing this alkene in other, warmer regions of the ISM.
description: 11 pages including figures, tables, references, and appendix; Accepted for publication in Astronomy and Astrophysics
The link between star-formation and supermassive black hole properties
Creators: name: Mountrichas, George
name: Buat, Veronique
Publisher: name: arXiv
Year: 2023
Subjects: subject: Astrophysics of Galaxies (astro-ph.GA)
subject: Cosmology and Nongalactic Astrophysics (astro-ph.CO)
subject: FOS: Physical sciences

description: It is well known that supermassive black holes (SMBHs) and their host galaxies co-evolve. AGN feedback plays an important role on this symbiosis. To study the effect of the AGN feedback on the host galaxy, a popular method is to study the star-formation rate (SFR) as a function of the X-ray luminosity (L$_X$). However, hydrodynamical simulations suggest that the cumulative impact of AGN feedback on a galaxy is encapsulated in the mass of the SMBH, M$_{BH}$, rather than the L$_X$. In this study, we compare the SFR of AGN and non-AGN galaxies as a function of L$_X$, M$_{BH}$, Eddington ratio (n$_{Edd}$) and specific black hole accretion rate ($λ_{sBHAR}$). For that purpose, we use 122 X-ray AGN in the XMM-XXL field and 3371 galaxies from the VIPERS survey and calculate the SFR$_{norm}$ parameter, defined as the ratio of the SFR of AGN to the SFR of non-AGN galaxies with similar stellar mass, M$_*$, and redshift. Our datasets span a redshift range of $\rm 0.5\leq z\leq 1.2$. The results show that the correlation between SFR$_{norm}$ and M$_{BH}$ is stronger compared to that between SFR$_{norm}$ and L$_X$. A weaker correlation is found between SFR$_{norm}$ and $λ_{sBHAR}$. No correlation is detected between SFR$_{norm}$ and n$_{Edd}$. These results corroborate the idea that the M$_{BH}$ is a more robust tracer of the cumulative impact of the AGN feedback compared to the instantaneous accretion rate (L$_X$) and, thus, a better predictive parameter of the changes of the SFR of the host galaxy.
description: A&A accepted, 10 pages, 4 figures, 6 tables
Molecular absorption lines toward star-forming regions : a comparative study of HCO+, HNC, HCN, and CN
Creators: name: Godard, Benjamin
name: Falgarone, Edith
name: Gerin, Maryvonne
name: Hily-Blant, Pierre
name: De Luca, Massimo
Publisher: name: arXiv
Year: 2010
Subjects: subject: Astrophysics of Galaxies (astro-ph.GA)
subject: FOS: Physical sciences

description: Aims. The comparative study of several molecular species at the origin of the gas phase chemistry in the diffuse interstellar medium (ISM) is a key input in unraveling the coupled chemical and dynamical evolution of the ISM. Methods. The lowest rotational lines of HCO+, HCN, HNC, and CN were observed at the IRAM-30m telescope in absorption against the λ3 mm and λ1.3 mm continuum emission of massive star-forming regions in the Galactic plane. The absorption lines probe the gas over kiloparsecs along these lines of sight. The excitation temperatures of HCO+ are inferred from the comparison of the absorptions in the two lowest transitions. The spectra of all molecular species on the same line of sight are decomposed into Gaussian velocity components. Most appear in all the spectra of a given line of sight. For each component, we derived the central opacity, the velocity dispersion, and computed the molecular column density. We compared our results to the predictions of UV-dominated chemical models of photodissociation regions (PDR models) and to those of non-equilibrium models in which the chemistry is driven by the dissipation of turbulent energy (TDR models). Results. The molecular column densities of all the velocity components span up to two orders of magnitude. Those of CN, HCN, and HNC are linearly correlated with each other with mean ratios N(HCN)/N(HNC) = 4.8 $\pm$ 1.3 and N(CN)/N(HNC) = 34 $\pm$ 12, and more loosely correlated with those of HCO+, N(HNC)/N(HCO+) = 0.5 $\pm$ 0.3, N(HCN)/N(HCO+) = 1.9 $\pm$ 0.9, and N(CN)/N(HCO+) = 18 $\pm$ 9. These ratios are similar to those inferred from observations of high Galactic latitude lines of sight, suggesting that the gas sampled by absorption lines in the Galactic plane has the same chemical properties as that in the Solar neighbourhood. The FWHM of the Gaussian velocity components span the range 0.3 to 3 km s-1 and those of the HCO+ lines are found to be 30% broader than those of CN-bearing molecules. The PDR models fail to reproduce simultaneously the observed abundances of the CN-bearing species and HCO+, even for high-density material (100 cm-3 < nH < 104 cm-3). The TDR models, in turn, are able to reproduce the observed abundances and abundance ratios of all the analysed molecules for the moderate gas densities (30 cm-3 < nH < 200 cm-3) and the turbulent energy observed in the diffuse interstellar medium. Conclusions. Intermittent turbulent dissipation appears to be a promising driver of the gas phase chemistry of the diffuse and translucent gas throughout the Galaxy. The details of the dissipation mechanisms still need to be investigated.
Impact of Information and Communication Technologies in Legal Education: A Focus on Legal Research and Teaching in Africa
Creators: name: Ajufo, Nnenna
Publisher: name: KNUST Law Journal
Year: 2018

description: In this age of educational globalisation, Information and Communication Technologies (ICTs) have become one of the basic building blocks of contemporary legal education. Nowadays, it is almost impossible to live and communicate without a computer and ICTs are becoming increasingly available in schools and universities around the globe. It has also become almost impossible for a law teacher to work effectively without using ICTs and for a law student to learn effectively without same. In many jurisdictions, the understanding and mastering of ICT skills and concepts is regarded as part of core legal education.
This paper discusses how law faculties of African Universities can efficiently prepare their students, introducing them to this new world without borders created by the emergence of ICTs. It also highlights the challenges faced by African law faculties in taking advantage of an ICT impacted legal educational system and will proffer recommendations that would create entry points for law faculties of African Universities to measure up with their counterparts in different parts of the globe.
description: KNUST Law Journal, Vol 7 (2017): KNUST Law Journal
Spiral shocks induced in galactic gaseous disk: hydrodynamic understanding of observational properties of spiral galaxies
Creators: name: Aktar, Ramiz
name: Xue, Li
name: Zhang, Li-Xin
name: Luo, Jing-Yi
Publisher: name: arXiv
Year: 2023
Subjects: subject: Astrophysics of Galaxies (astro-ph.GA)
subject: FOS: Physical sciences

description: We investigate the properties of spiral shocks in a steady, adiabatic, non-axisymmetric, self-gravitating, mass-outflowing accretion disk around a compact object. We obtain the accretion-ejection solutions in a gaseous galactic disk and apply them to the spiral galaxies to investigate the possible physical connections between some galaxy observational quantities. The self-gravitating disk potential is considered following Mestel's (1963) prescription. The spiral shock-induced accretion-ejection solutions are obtained following the point-wise self-similar approach. We observe that the self-gravitating disk profoundly affects the dynamics of the spiral structure of the disk and the properties of the spiral shocks. We find that the observational dispersion between the pitch angle and shear rate and between the pitch angle and star formation rate in spiral galaxies contains some important physical information. There are large differences in star formation rates among galaxies with similar pitch angles, which may be explained by the different star formation efficiencies caused by the distinct galactic ambient conditions.
description: 13 pages, 7 figures, accepted for publication in Astronomy & Astrophysics
The spatial distribution and origin of the FUV excess in early-type galaxies
Creators: name: Carter, David
name: Pass, Sally
name: Kennedy, Joseph
name: Karick, Arna M.
name: Smith, Russell J.
Publisher: name: arXiv
Year: 2011
Subjects: subject: Cosmology and Nongalactic Astrophysics (astro-ph.CO)
subject: FOS: Physical sciences

description: We present surface photometry of a sample of 52 galaxies from the GALEX and 2MASS data archives, these include 32 normal elliptical galaxies, 10 ellipticals with weak Liner or other nuclear activity, and 10 star forming ellipticals or early-type spirals. We examine the spatial distribution of the Far Ultra-Violet excess in these galaxies, and its correlation with dynamical and stellar population properties of the galaxies. From aperture photometry we find that all galaxies except for recent major remnants and galaxies with ongoing star formation show a positive gradient in the (FUV-NUV) colour determined from the GALEX images. The logarithmic gradient does not correlate with any stellar population parameter, but it does correlate with the central velocity dispersion. The strength of the excess on the other hand, correlates with both [alpha/Fe] and [Z/H], but more strongly with the former. We derive models of the underlying stellar population from the 2MASS H-band images, and the residual of the image from this model reveals a map of the centrally concentrated FUV excess. We examine a possible hypothesis for generating the FUV excess and the radial gradient in its strength, involving a helium abundance gradient set up early in the formation process of the galaxies. If this hypothesis is correct, the persistence of the gradients to the present day places a strong limit on the importance of dry mergers in the formation of ellipticals.
description: 36 pages, accepted for publication in MNRAS. Appendices will appear in online journal only. This version has reduced resolution for the figure in Appendix B to comply with arXiv size limits
Mean field theory for driven domain walls in disordered environments
Creators: name: Schütze, Friedmar
name: Nattermann, Thomas
Publisher: name: arXiv
Year: 2010
Subjects: subject: Statistical Mechanics (cond-mat.stat-mech)
subject: FOS: Physical sciences

description: We study the mean field equation of motion for driven domain walls in random media. We discuss the two cases of an external constant as well as an oscillating driving force. Our main focus lies on the critical dynamics close to the depinning transition, which we study by analytical and numerical methods. We find power-law scaling for the velocity as well as the hysteresis loop area.
description: 16 pages, 19 figures, submitted to Phys. Rev. B
Is there further evidence for spatial variation of fundamental constants?
Creators: name: Berengut, J. C.
name: Flambaum, V. V.
name: King, J. A.
name: Curran, S. J.
name: Webb, J. K.
Publisher: name: arXiv
Year: 2010
Subjects: subject: Cosmology and Nongalactic Astrophysics (astro-ph.CO)
subject: High Energy Physics - Phenomenology (hep-ph)
subject: Nuclear Theory (nucl-th)
subject: Atomic Physics (physics.atom-ph)
subject: FOS: Physical sciences

description: The detection of a spatial variation of the fine-structure constant, alpha, based on study of quasar absorption systems has recently been reported. The physics that causes this alpha-variation should have other observable manifestations, and this motivates us to look for complementary astrophysical effects. In this paper we propose a method to test whether spatial variation of fundamental constants existed during the epoch of big bang nucleosynthesis. Using existing measurements of primordial deuterium abundance we find very weak indications that such a signature might exist, but the paucity of measurements precludes any firm conclusion. We also examine existing quasar absorption spectra data that are sensitive to variation of the electron-to-proton mass ratio, mu, and x = (alpha^2 mu g_p) for spatial variation.
description: 6 pages, 1 figure
Leuctra rickeri James 1976
Creators: name: Harrison, Audrey B.
name: Stark, Bill P.
Publisher: name: Zenodo
Year: 2010
Subjects: Biodiversity
Taxonomy
Animalia
Arthropoda
Insecta
Plecoptera
Leuctridae
Leuctra
Leuctra rickeri

description: Leuctra rickeri James (Figs. 38-40) Leuctra rickeri James, 1976:882. Holotype ♂ (INHS), 1.5 mi E Frenchburg, Hwy 460, Menifee Co., Kentucky Material examined. Illinois: Pope Co., Burden Creek, FR 402, Burden Falls, 18 May 2006, B. Stark, I. Sivec, 34♂, 42♀ (BPS). Kentucky: Rowan Co., Logan Branch, Logan Hollow, 23 May 1999, B. Stark, R. F. Kirchner, 4♂, 10♀ (BPS). Mississippi: Webster Co., The Cove, 7 mi W Walthall, T 20 N, R 8 E, Sec. 12, Malaise trap, 22-28 April 1988, T. L. Schiefer, 1♂ (MEM). Comments. Although the holotype is from Kentucky, most of the paratype series of this species are from sites in the Shawnee National Forest near the Burden Creek location of our specimens. The Logan Branch, Kentucky site is in a county adjacent to Menifee Co., where the holotype was collected. As discussed above for L. alabama, the holotype and topotype specimens need to be carefully studied to evaluate the status of this species. Additional material is needed to allow examination of Mississippi specimens with SEM.
description: Published as part of Harrison, Audrey B. & Stark, Bill P., 2010, Two New Species Of Stoneflies In The Leuctra Ferruginea Group (Plecoptera: Leuctridae), With Notes On The Leuctra Species Known For Mississippi And Alabama, U. S. A., pp. 16-33 in Illiesia 6 (3) on page 31, DOI: 10.5281/zenodo.4759571
description: {"references": ["James, A. M. 1976. Two new species of Leuctra, with notes on the ferruginea group (Plecoptera: Leuctridae). Annals of the Entomological Society of America, 69: 882 - 884."]}
Leuctra szczytkoi Stark & Stewart 1981
Creators: name: Harrison, Audrey B.
name: Stark, Bill P.
Publisher: name: Zenodo
Year: 2010
Subjects: Biodiversity
Taxonomy
Animalia
Arthropoda
Insecta
Plecoptera
Leuctridae
Leuctra
Leuctra szczytkoi

description: Leuctra szczytkoi Stark & Stewart (Figs. 51-56) Leuctra szczytkoi Stark & Stewart, 1981:91. Holotype ♂ (USNM), Schoolhouse Springs, Jackson Parish, Louisiana Leuctra szczytkoi: DeWalt & Stark, 1996:61. Female and larval descriptions Material examined. Louisiana: Jackson Parish, Schoolhouse Springs, 7.6 km NNW Eros, T17 N, R1 W, Sec 12, 11 October 1997, R. E. DeWalt, B. Stark, 14♂, 21♀ (INHS). Comments. The specimens examined in this study are from the type locality. As indicated above the male paraprocts are very similar to those of L. paleo.
description: Published as part of Harrison, Audrey B. & Stark, Bill P., 2010, Two New Species Of Stoneflies In The Leuctra Ferruginea Group (Plecoptera: Leuctridae), With Notes On The Leuctra Species Known For Mississippi And Alabama, U. S. A., pp. 16-33 in Illiesia 6 (3) on page 31, DOI: 10.5281/zenodo.4759571
description: {"references": ["Stark, B. P. & K. W. Stewart. 1981. Leuctra szczytkoi, a new stonefly from Louisiana (Plecoptera: Leuctridae). Entomological News, 92: 91 - 92."]}
The Objectives of Oil and Gas Regulation: Lessons for Ghana’s Petroleum Sector
Creators: name: Osei-Hwere, Richmond
Publisher: name: KNUST Law Journal
Year: 2018

description: The regulatory approach employed by states in the control of oil and gas resources is dictated by a number of factors including: political motives of the state; risks associated with petroleum exploration and the state’s capacity to absorb these risks; coupled with the efficiency of the regulatory framework. Whether it is a joint venture between a national oil company and international oil companies or whether it is a concessionary regime or total state participation in commercial activity; the oil industry can only flourish in a climate characterized by strong regulatory framework. This paper identifies and discuses some of the key objectives of oil and gas regulation. It is observed that realisation of these objectives requires the setting up of a robust regulatory regime backed by independent regulatory bodies that are insulated against conflict of interest risks.
description: KNUST Law Journal, Vol 7 (2017): KNUST Law Journal
CeFePO: f-d hybridization and quenching of superconductivity
Creators: name: Holder, M. G.
name: Jesche, A.
name: Lombardo, P.
name: Hayn, R.
name: Vyalikh, D. V.
name: Danzenbächer, S.
name: Kummer, K.
name: Krellner, C.
name: Geibel, C.
name: Kucherenko, Yu.
name: Kim, T.
name: Follath, R.
name: Molodtsov, S. L.
name: Laubschat, C.
Publisher: name: arXiv
Year: 2010
Subjects: subject: Superconductivity (cond-mat.supr-con)
subject: Strongly Correlated Electrons (cond-mat.str-el)
subject: FOS: Physical sciences

description: Being homologue to the new, Fe-based type of high-temperature superconductors, CeFePO exhibits magnetism, Kondo and heavy-fermion phenomena. We experimentally studied the electronic structure of CeFePO by means of angle-resolved photoemission spectroscopy. In particular, contributions of the Ce 4f-derived states and their hybridization to the Fe 3d bands were explored using both symmetry selection rules for excitation and their photoionization cross-section variations as a function of photon energy. It was experimentally found - and later on confirmed by LDA as well as DMFT calculations - that the Ce 4f states hybridize to the Fe 3d states of d_{3z^2-r^2} symmetry near the Fermi level that discloses their participation in the occurring electron-correlation phenomena and provides insight into mechanism of superconductivity in oxopnictides.
description: 5 pages, 3 figures
Influence of photoexcitation depth on luminescence spectra of bulk GaAs single crystals: application to defect structure characterization
Creators: name: Yuryev, V. A.
name: Kalinushkin, V. P.
name: Zayats, A. V.
name: Repeyev, Yu. A.
name: Fedoseyev, V. G.
Publisher: name: arXiv
Year: 2011
Subjects: subject: Materials Science (cond-mat.mtrl-sci)
subject: Mesoscale and Nanoscale Physics (cond-mat.mes-hall)
subject: Optics (physics.optics)
subject: FOS: Physical sciences

description: The results of investigation of bulk GaAs photoluminescence are presented taken from near-surface layers of different thicknesses using for excitation the light with the wavelengths which are close but some greater than the excitonic absorption resonances (so-called "bulk" photoexcitation). Only the excitonic and band-edge luminescence is seen under the interband excitation, while under the "bulk" excitation, the spectra are much more informative. The interband excited spectra of all the samples investigated in the present work are practically identical, whereas the bulk excited PL spectra are different for different samples and excitation depths and provide the information on the deep-level point defect composition of the bulk materials.
description: DRIP-VI, 1995
Robin inequality for $7-$free integers
Creators: name: Solé, Patrick
name: Planat, Michel
Publisher: name: arXiv
Year: 2010
Subjects: subject: Number Theory (math.NT)
subject: FOS: Mathematics

description: Recall that an integer is $t-$free iff it is not divisible by $p^t$ for some prime $p.$ We give a method to check Robin inequality $σ(n) < e^γn\log\log n,$ for $t-$free integers $n$ and apply it for $t=6,7.$ We introduce $Ψ_t,$ a generalization of Dedekind $Ψ$ function defined for any integer $t\ge 2$ by $$Ψ_t(n):=n\prod_{p | n}(1+1/p+...+1/p^{t-1}).$$ If $n$ is $t-$free then the sum of divisor function $σ(n)$ is $ \le Ψ_t(n).$ We characterize the champions for $x \mapsto Ψ_t(x)/x,$ as primorial numbers. Define the ratio $R_t(n):=\frac{Ψ_t(n)}{n\log\log n}.$ We prove that, for all $t$, there exists an integer $n_1(t),$ such that we have $R_t(N_n)< e^γ$ for $n\ge n_1,$ where $N_n=\prod_{k=1}^np_k.$ Further, by combinatorial arguments, this can be extended to $R_t(N)\le e^γ$ for all $N\ge N_n,$ such that $n\ge n_1(t).$ This yields Robin inequality for $t=6,\,7.$ For $t$ varying slowly with $N$, we also derive $R_t(N)< e^γ.$
description: 5 pages
Supplementary document for Nonlinear absorption and integrated photonics applications of MoSSe - 6001067.pdf
Creators: name: LI, XIAOBO
name: Chen, Xin
name: Wei, Ning
name: Chen, Chenduan
name: YANG, ZHAN
name: Xie, Haijiao
name: He, Jiajing
name: Dong, Ningning
name: Dan, Yaping
name: Wang, Jun
Publisher: name: Optica Publishing Group
Year: 2022
Subjects: Uncategorized

description: figure S1-3
Empirical Contrast Model for High-Contrast Imaging -- A VLT/SPHERE Case Study
Creators: name: Courtney-Barre, Benjamin
name: De Rosa, Robert
name: Kokotanekova, Rosita
name: Romero, Cristian
name: Jones, Matias
name: Milli, Julien
name: Wahhaj, Zahed
Publisher: name: arXiv
Year: 2023
Subjects: subject: Instrumentation and Methods for Astrophysics (astro-ph.IM)
subject: FOS: Physical sciences

description: The ability to accurately predict the contrast achieved from high contrast imagers is important for efficient scheduling and quality control measures in modern observatories. We aim to consistently predict and measure the raw contrast achieved by SPHERE/IRDIS on a frame by frame basis to improve the efficiency and scientific yield with SPHERE at the Very Large Telescope (VLT).Contrast curves were calculated for over 5 years of archival data using the most common SPHERE/IRDIS coronagraphic mode in the H2/H3 dual band filter, consisting of approximately 80,000 individual frames. These were merged and interpolated with atmospheric data to create a large data-base of contrast curves with associated features. An empirical power law model for contrast, motivated by physical considerations, was then trained and finally tested on an out-of-sample test data set. At an angular separation of 300 mas, the contrast model achieved a mean (out-of-sample) test error of 0.13 magnitudes with the residual 5-95% percentiles between -0.23 and 0.64 magnitude respectively. The models test set root mean square error (RMSE) between 250-600 mas was between 0.31 - 0.40 magnitudes which is equivalent with other state-of-the-art contrast models presented in the literature. In general, the model performed best for targets between 5-9 G-band magnitude, with degraded performance for targets outside this range. This model is currently being incorporated into the Paranal SCUBA software for first level quality control and real time scheduling support.
Cluster Ages to Reconstruct the Milky Way Assembly (CARMA) I. The final word on the origin of NGC6388 and NGC6441
Creators: name: Massari, Davide
name: Aguado-Agelet, Fernando
name: Monelli, Matteo
name: Cassisi, Santi
name: Pancino, Elena
name: Saracino, Sara
name: Gallart, Carme
name: Ruiz-Lara, Tomás
name: Fernández-Alvar, Emma
name: Surot, Francisco
name: Stokholm, Amalie
name: Salaris, Maurizio
name: Miglio, Andrea
name: Ceccarelli, Edoardo
Publisher: name: arXiv
Year: 2023
Subjects: subject: Astrophysics of Galaxies (astro-ph.GA)
subject: FOS: Physical sciences

description: We present CARMA, the Cluster Ages to Reconstruct the Milky Way Assembly project, that aims at determining precise and accurate age measurements for the entire system of known Galactic globular clusters and at using them to trace the most significant merger events experienced by the Milky Way. The strength of CARMA relies on the use of homogeneous photometry, theoretical isochrones, and statistical methods, that will enable to define a systematic-free chronological scale for the complete sample of Milky Way globulars. In this paper we describe the CARMA framework in detail, and present a first application on a sample of six metal-rich globular clusters with the aim of putting the final word on the debated origin of NGC6388 and NGC6441. Our results demonstrate that this pair of clusters is coeval with other four systems having a clear in-situ origin. Moreover, their location in the age-metallicity plane matches the one occupied by in-situ field stars. Such an accurate age comparison enabled by the CARMA methodology rules out the possibility that NGC6388 and NGC6441 have been accreted as part of a past merger event.
description: 11 pages + Appendix, 13 figures, accepted for publication by A&A
A Simple Numerical Absorbing Layer Method in Elastodynamics
Creators: name: Semblat, Jean-François
name: Gandomzadeh, Ali
name: Lenti, Luca
Publisher: name: arXiv
Year: 2010
Subjects: subject: Classical Physics (physics.class-ph)
subject: FOS: Physical sciences

description: The numerical analysis of elastic wave propagation in unbounded media may be difficult to handle due to spurious waves reflected at the model artificial boundaries. Several sophisticated techniques such as nonreflecting boundary conditions, infinite elements or absorbing layers (e.g. Perfectly Matched Layers) lead to an important reduction of such spurious reflections. In this Note, a simple and efficient absorbing layer method is proposed in the framework of the Finite Element Method. This method considers Rayleigh/Caughey damping in the absorbing layer and its principle is presented first. The efficiency of the method is then shown through 1D Finite Element simulations considering homogeneous and heterogeneous damping in the absorbing layer. 2D models are considered afterwards to assess the efficiency of the absorbing layer method for various wave types (surface waves, body waves) and incidences (normal to grazing). The method is shown to be efficient for different types of elastic waves and may thus be used for various elastodynamic problems in unbounded domains.
Embeddability of locally finite metric spaces into Banach spaces is finitely determined
Creators: name: Ostrovskii, Mikhail I.
Publisher: name: arXiv
Year: 2011
Subjects: subject: Functional Analysis (math.FA)
subject: FOS: Mathematics

description: The main purpose of the paper is to prove the following results: Let $A$ be a locally finite metric space whose finite subsets admit uniformly bilipschitz embeddings into a Banach space $X$. Then $A$ admits a bilipschitz embedding into $X$. Let $A$ be a locally finite metric space whose finite subsets admit uniformly coarse embeddings into a Banach space $X$. Then $A$ admits a coarse embedding into $X$. These results generalize previously known results of the same type due to Brown-Guentner (2005), Baudier (2007), Baudier-Lancien (2008), and the author (2006, 2009). One of the main steps in the proof is: each locally finite subset of an ultraproduct $X^\mathcal{U}$ admits a bilipschitz embedding into $X$. We explain how this result can be used to prove analogues of the main results for other classes of embeddings.
The birth and early evolution of a low mass protostar
Creators: name: Ahmad, Adnan Ali
name: González, Matthias
name: Hennebelle, Patrick
name: Commerçon, Benoît
Publisher: name: arXiv
Year: 2023
Subjects: subject: Solar and Stellar Astrophysics (astro-ph.SR)
subject: Astrophysics of Galaxies (astro-ph.GA)
subject: FOS: Physical sciences

description: Understanding the collapse of dense molecular cloud cores to stellar densities and the subsequent evolution of the protostar is of importance to model the feedback effects such an object has on its surrounding environment, as well as describing the conditions with which it enters the stellar evolutionary track. This process is fundamentally multi-scale and necessitates the use of robust numerical simulations. We aim to model the birth and early evolution of a low-mass protostar. We also seek to describe the interior structure of the protostar and the radiative behavior of its accretion shock front. We carry out a high resolution numerical simulation of the collapse of a gravitationally unstable $1$ $\mathrm{M_{\odot}}$ dense molecular cloud core to stellar densities using three-dimensional radiation hydrodynamics under the gray flux-limited diffusion approximation. We follow the initial isothermal phase, the first adiabatic contraction, the second gravitational collapse triggered by the dissociation of $\mathrm{H}_{2}$ molecules, and $\approx 247$ days of the subsequent main accretion phase. We find that the sub-critical radiative behavior of the protostar's shock front causes it to swell as it accretes matter. We also find that the protostar is turbulent from the moment of its inception despite its radiative stability. This turbulence causes significant entropy mixing inside the protostar, which regulates the swelling. Furthermore, we find that the protostar is not fully ionized at birth, but the relative amount of ionized material within it increases as it accretes matter from its surroundings. Finally, we report in the appendix the results of the first 3D calculations involving a frequency-dependent treatment of radiative transfer, which has not produced any major differences with its gray counterpart.
description: Accepted for publication in A&A, 23 pages, 27 figures
Optical beam-induced scattering mode of mid-IR laser microscopy: a method for defect investigation in near-surface and near-interface regions of bulk semiconductors
Creators: name: Astafiev, O. V.
name: Kalinushkin, V. P.
name: Yuryev, V. A.
Publisher: name: arXiv
Year: 2011
Subjects: subject: Materials Science (cond-mat.mtrl-sci)
subject: Mesoscale and Nanoscale Physics (cond-mat.mes-hall)
subject: Optics (physics.optics)
subject: FOS: Physical sciences

description: This paper presents a new technique of optical beam-induced scattering of mid-IR-laser radiation, which is a special mode of the recently developed scanning mid-IR-laser microscopy. The technique in its present form is designed for investigation of large-scale recombination-active defects in near-surface and near-interface regions of semiconductor wafers. However, it can be easily modified for the defect investigations in the crystal bulk. Being in many respects analogous to EBIC, the present technique has some indisputable advantages, which enable its application for both non-destructive laboratory investigations and quality monitoring in the industry.
description: DRIP-VI, 1995
Exploring the Brown Dwarf Desert with Precision Radial Velocities and Gaia DR3 Astrometric Orbits
Creators: name: Unger, N.
name: Ségransan, D.
name: Barbato, D.
name: Delisle, J. -B.
name: Sahlmann, J.
name: Holl, B.
name: Udry, S.
Publisher: name: arXiv
Year: 2023
Subjects: subject: Earth and Planetary Astrophysics (astro-ph.EP)
subject: Astrophysics of Galaxies (astro-ph.GA)
subject: Solar and Stellar Astrophysics (astro-ph.SR)
subject: FOS: Physical sciences

description: Context. The observed scarcity of brown dwarfs in close orbits (within 10 au) around solar-type stars poses significant questions about the origins of these substellar companions. These questions impact our broader understanding of planetary formation processes. However, to resolve these formation mechanisms, accurate observational constraints are essential. Most of the brown dwarfs have been discovered by radial velocity surveys, but this method introduces uncertainties due to its inability to determine the orbital inclination, leaving the true mass-and thus their true nature-unresolved. This highlights the crucial role of astrometric data, helping us distinguish between genuine brown dwarfs and stars. Aims. We aim to refine the mass estimates of massive companions to solar-type stars, mostly discovered through radial velocity measurements and subsequently validated using Gaia DR3 astrometry, to gain a clearer understanding of their true mass and occurrence rates. Methods. We selected a sample of 31 sources with substellar companion candidates validated by Gaia DR3 and with available radial velocities. Using the Gaia DR3 solutions as prior information, we performed an MCMC fit with the available radial velocity measurements to integrate these two sources of data and thus obtain an estimate of their true mass. Results. Combining radial velocity measurements with Gaia DR3 data led to more precise mass estimations, leading us to reclassify several systems initially labeled as brown dwarfs as low-mass stars. Out of the 32 analyzed companions, 13 are determined to be stars, 17 are sub-stellar, and 2 have inconclusive results with the current data. Importantly, using these updated masses, we reevaluated the occurrence rate of brown dwarf companions (13-80 M$_{jup}$ ) on close orbits (<10 au) in the CORALIE sample, determining a tentative occurrence rate of $0.8^{+0.3}_{-0.2}\%$
description: Accepted by A&A
Local amplification of deep mining induced vibrations - Part.2: Simulation of the ground motion in a coal basin
Creators: name: Semblat, Jean-François
name: Lokmane, N.
name: Driad-Lebeau, L.
name: Bonnet, Guy
Publisher: name: arXiv
Year: 2010
Subjects: subject: Geophysics (physics.geo-ph)
subject: FOS: Physical sciences

description: This work investigates the impact of deep coal mining induced vibrations on surface constructions using numerical tools. An experimental study of the geological site amplification and of its influence on mining induced vibrations has already been published in a previous paper (Part 1: Experimental evidence for site effects in a coal basin). Measurements have shown the existence of an amplification area in the southern part of the basin where drilling data have shown the presence of particularly fractured and soft stratigraphic units. The present study, using the Boundary Element Method (BEM) in the frequency domain, first investigates canonical geological structures in order to get general results for various sites. The amplification level at the surface is given as a function of the shape of the basin and of the velocity contrast with the bedrock. Next, the particular coal basin previously studied experimentally (Driad-Lebeau et al., 2009) is modeled numerically by BEM. The amplification phenomena characterized numerically for the induced vibrations are found to be compatible with the experimental findings: amplification level, frequency range, location. Finally, the whole work was necessary to fully assess the propagation and amplification of mine induced vibrations. The numerical results quantifying amplification can also be used to study other coal basins or various types of alluvial sites.