cometadata/datacite-rtg-text-other-reclassification-records huggingface dataset:
The occurrence of suicidal ideation over the course of HIV infection in gay men: A cross-sectional study
Creators: name: Hendricks, Michael Lawrence
Publisher: name: American University
Year: 2023

description: Previous research has demonstrated an elevation in emotional distress and suicidality in persons infected with HIV. However, no study had previously reported having systematically analyzed the modulation of suicidal ideation or the qualitative changes associated with ideation which likely occur with the progression of HIV illness. This study utilized a controlled, cross-sectional model and self-report questionnaire instruments to assess the level of suicidal ideation and factors related to ideation, as well as depression, hopelessness, social support, and disease-related health factors in gay men at different points of HIV illness progression. As expected, the seropositive group evidenced significantly greater levels of suicidal ideation, depression, and hopelessness than the seronegative controls. Among the disease-related factors, only time since diagnosis of seropositivity predicted level of suicidal ideation: ideation increased linearly with the passage of time, suggesting that suicidality is mediated by psychological processes. A discriminant analysis revealed that time since diagnosis correctly distinguished ideators from nonideators only 61.2% of the time. This function lacks the accuracy necessary to be useful as a diagnostic tool, but suggests the importance of assessing this factor. Seropositive ideators who had survived HIV for more than five years, compared to those who had been diagnosed within two years, reported a higher incidence of persons in their environment who would lend at least emotional support for committing suicide, and among reasons for not committing suicide rated fear of social disapproval and moral objections as less important. These two groups were not significantly different on other measures, suggesting that the long-term survivors had sought out support for their suicidal intentions and disposed of reasons which might prevent them from enacting them. Finally, significant interactions were found between time since diagnosis and presence or absence of suicidal ideation on the factors of support network size, helpers for suicide, and fear of suicide and moral objections as suicide deterrents. These results suggest that long-term HIV survivors develop support networks that are more similar in size but different in composition than those newly diagnosed, and that they tend to dispose of reasons that would prevent them from acting on suicidal thoughts.
An analog model for a freshman orientation program for a public, urban university
Creators: name: McGuire, Noreen
Publisher: name: American University
Year: 2023

description: Standards established by the Council for the Advancement of Standards in Higher Education (CAS) served as the framework against which an analog model for a freshman orientation program of optimum design for a public, urban university was developed. The model program was based upon an analysis of published descriptions of current (1991-1993) orientation programs in a sample of 65 post-secondary institutions, responses of samples of 52 students and 46 faculty to the CAS Standards in Higher Education, and information about the ongoing orientation program at a public, urban university elicited through interviews with 299 students and 120 faculty therein. Each aspect of the analog model was patterned after the CAS Standards: mission; program; organization and administration; human rights; funding; facilities; legal responsibilities, equal opportunities, access and affirmative action; campus and community relations; multi-cultural programs and services; and evaluation. In regard to program, in particular, the model centered on active involvement by freshmen in all aspects of first-year life; peer, faculty and staff response to questions and perceived problems; and a series of workshops and special programs devoted to virtually every issue a freshman will likely encounter during his/her early experience at the institution.
Continuous symmetries of Lagrangians and exact solutions of discrete equations
Creators: name: Dorodnitsyn, Vladimir
name: Kozlov, Roman
name: Winternitz, Pavel
Publisher: name: arXiv
Year: 2003
Subjects: subject: Exactly Solvable and Integrable Systems (nlin.SI)
subject: Mathematical Physics (math-ph)
subject: FOS: Physical sciences

description: One of the difficulties encountered when studying physical theories in discrete space-time is that of describing the underlying continuous symmetries (like Lorentz, or Galilei invariance). One of the ways of addressing this difficulty is to consider point transformations acting simultaneously on difference equations and lattices. In a previous article we have classified ordinary difference schemes invariant under Lie groups of point transformations. The present article is devoted to an invariant Lagrangian formalism for scalar single-variable difference schemes. The formalism is used to obtain first integrals and explicit exact solutions of the schemes. Equations invariant under two- and three- dimensional groups of Lagrangian symmetries are considered.
description: 31 pages, submitted to Journal of Mathematical Physics
Critical slowing down of topological modes
Creators: name: Del Debbio, Luigi
name: Manca, Gian Mario
name: Vicari, Ettore
Publisher: name: arXiv
Year: 2004
Subjects: subject: High Energy Physics - Lattice (hep-lat)
subject: FOS: Physical sciences

description: We investigate the critical slowing down of the topological modes using local updating algorithms in lattice 2-d CP^(N-1) models. We show that the topological modes experience a critical slowing down that is much more severe than the one of the quasi-Gaussian modes relevant to the magnetic susceptibility, which is characterized by $τ_{\rm mag} \sim ξ^z$ with $z\approx 2$. We argue that this may be a general feature of Monte Carlo simulations of lattice theories with non-trivial topological properties, such as QCD, as also suggested by recent Monte Carlo simulations of 4-d SU(N) lattice gauge theories.
description: 16 pages, 4 figures
An analog model for a freshman orientation program for a public, urban university
Creators: name: McGuire, Noreen
Publisher: name: ProQuest
Year: 2023
Subjects: classificationCode: 39
subject: Education
classificationCode: 3903
subject: Education systems
classificationCode: 3904
subject: Specialist studies in education

description: Standards established by the Council for the Advancement of Standards in Higher Education (CAS) served as the framework against which an analog model for a freshman orientation program of optimum design for a public, urban university was developed. The model program was based upon an analysis of published descriptions of current (1991-1993) orientation programs in a sample of 65 post-secondary institutions, responses of samples of 52 students and 46 faculty to the CAS Standards in Higher Education, and information about the ongoing orientation program at a public, urban university elicited through interviews with 299 students and 120 faculty therein. Each aspect of the analog model was patterned after the CAS Standards: mission; program; organization and administration; human rights; funding; facilities; legal responsibilities, equal opportunities, access and affirmative action; campus and community relations; multi-cultural programs and services; and evaluation. In regard to program, in particular, the model centered on active involvement by freshmen in all aspects of first-year life; peer, faculty and staff response to questions and perceived problems; and a series of workshops and special programs devoted to virtually every issue a freshman will likely encounter during his/her early experience at the institution.
Locus-of-control, age, and education as correlates to satisfaction with foreign service life in a sample of foreign service spouses
Creators: name: Herbert, April Peck
Publisher: name: American University
Year: 2023

description: This study proposes to (a) ascertain the relationship of locus of control, age, and educational level to extent of satisfaction with Foreign Service life in a sample of female spouses of American Foreign Service employees assigned to the United States embassies in La Paz, Bolivia; Havana, Cuba; Santo Domingo, Dominican Republic; and Managua, Nicaragua, and (b) to interpret the findings for their meaning to prospective spouses and to U.S. Department of State personnel responsible for spouse and family support programs, such as Overseas Briefing Center, Family Liaison Office, and Community Liaison Officers. The Rotter Internal-External Locus of Control Scale, the Foreign Service Spouse Satisfaction Inventory, and a Personal Data Inventory were used respectively to assess internal or external locus-of-control orientation; satisfaction with the mobility, sociocultural, and personal aspects of Foreign Service life; and personal characteristics such as age and education. These instruments were completed by 89 Foreign Service spouses from the above embassy communities during October/November 1992. Statistical analysis using t tests indicated no significant differences (p $<$.05) in mean satisfaction with Foreign Service life scores between those subjects with internal versus external locus of control, between those subjects "under age 35" or "age 35 and over," or between those subjects with "less than a bachelor's degree" versus those subjects with a "bachelor's degree or higher." Analysis of variance results indicated that internal spouses "age 35 and over" and spouses with "less than a bachelor's degree" did not show the highest level of satisfaction with Foreign Service life, indicating that education and locus of control and age and locus of control did not interact to have an effect on satisfaction with Foreign Service life. Correlational analysis indicated that satisfaction with Foreign Service life was not found to be significantly correlated with locus of control. The writer concluded that the complexity of Foreign Service life is such as to preclude prediction of satisfaction of the female spouse with it on the basis of a variable or variables considered individually. Such prediction would be better made on the basis of a number of variables considered in combination with each other.
Andrena (Melandrena) layiae Timberlake 1951
Creators: name: Pedro, Diego De
name: Ceccarelli, Fadia Sara
name: Sagot, Philippe
name: López-Reyes, Eulogio
name: Mullins, Jessica L.
name: Mérida-Rivas, Jorge A.
name: Falcon-Brindis, Armando
name: Griswold, Terry
name: Ascher, John S.
name: Gardner, Joel
name: Ayala, Ricardo
name: Vides-Borrell, Eric
name: Vandame, Rémy
Publisher: name: Zenodo
Year: 2024
Subjects: Biodiversity
Taxonomy
Animalia
Arthropoda
Insecta
Hymenoptera
Andrenidae
Andrena
Andrena layiae

description: Andrena (Melandrena) layiae Timberlake, 1951
[Holotype: UCRC; ♀ Ensenada, Baja California, Mexico; April 24, 1941]
The holotype female of Andrena layiae is from Ensenada, BC. We examined one male reported by Bouseman & LaBerge (1970) from the Succulent Coastal Sage collected in March 1960 (EMEC). See fig. 13.
description: Published as part of Pedro, Diego De, Ceccarelli, Fadia Sara, Sagot, Philippe, López-Reyes, Eulogio, Mullins, Jessica L., Mérida-Rivas, Jorge A., Falcon-Brindis, Armando, Griswold, Terry, Ascher, John S., Gardner, Joel, Ayala, Ricardo, Vides-Borrell, Eric & Vandame, Rémy, 2024, Revealing the Baja California Peninsula's Hidden Treasures: An Annotated checklist of the native bees (Hymenoptera: Apoidea: Anthophila), pp. 1-391 in Zootaxa 5522 (1) on page 58, DOI: 10.11646/zootaxa.5522.1.1, http://zenodo.org/record/13920532
On the impact of selected modern deep-learning techniques to the performance and celerity of classification models in an experimental high-energy physics use case
Creators: name: Strong, Giles Chatham
Publisher: name: arXiv
Year: 2020
Subjects: subject: Data Analysis, Statistics and Probability (physics.data-an)
subject: Machine Learning (cs.LG)
subject: High Energy Physics - Experiment (hep-ex)
subject: Machine Learning (stat.ML)
subject: FOS: Physical sciences
subject: FOS: Computer and information sciences

description: Beginning from a basic neural-network architecture, we test the potential benefits offered by a range of advanced techniques for machine learning, in particular deep learning, in the context of a typical classification problem encountered in the domain of high-energy physics, using a well-studied dataset: the 2014 Higgs ML Kaggle dataset. The advantages are evaluated in terms of both performance metrics and the time required to train and apply the resulting models. Techniques examined include domain-specific data-augmentation, learning rate and momentum scheduling, (advanced) ensembling in both model-space and weight-space, and alternative architectures and connection methods. Following the investigation, we arrive at a model which achieves equal performance to the winning solution of the original Kaggle challenge, whilst being significantly quicker to train and apply, and being suitable for use with both GPU and CPU hardware setups. These reductions in timing and hardware requirements potentially allow the use of more powerful algorithms in HEP analyses, where models must be retrained frequently, sometimes at short notice, by small groups of researchers with limited hardware resources. Additionally, a new wrapper library for PyTorch called LUMIN is presented, which incorporates all of the techniques studied.
description: Preprint V4: Fixing typographical error and correcting two plots. Mach. Learn.: Sci. Technol (2020)
Hylaeus (Hylaeus) kurdus
Creators: name: Özbek, Hikmet
name: Dathe, Holger H.
Publisher: name: Zenodo
Year: 2020
Subjects: Biodiversity
Taxonomy
Animalia
Arthropoda
Insecta
Hymenoptera
Colletidae
Hylaeus
Hylaeus kurdus

description: Hylaeus (Hylaeus) kurdus (WARNCKE, 1981)
Fig. 5
 Prosopis kurda WARNCKE, 1981: 182–183, . Turkey:
Hakkâri.
 Prosopis (Prosopis) kurda WARNCKE, 1981 – WARNCKE 1992:
769, 792.
 Hylaeus (Hylaeus) kurdus (WARNCKE, 1981) – ITIS (2020).
 Material examined: Van: Gürpınar, Hoşap, Güzeldere Geçidi, 2500–2600 m, 09– 12.07.1984, 4 , 2 , leg. A.W. Ebmer.
 Remarks: In the males of this species, the mask is transversely impressed in a bow below the antennal bases. The scapes are black, basally curved and distinctly enlarged over half of their length; apically they are flattened. The lateral marks run along the orbits, are rounded at the top and narrowly edged; at this point there are also smooth surfaces. These characters clearly distinguish this species from the similar H. trochilus (see there). The characteristic “rounded versus edged posterior margin of the vertex” (WARNCKE 1992: 792) is incomprehensible as a difference between H. kurdus and H. crispulus.
 H. kurdus was described from Hakkâri. Later it was also recorded in Bitlis and various additional localities in Hakkâri. Here, Van is added. Current and previous records show that it is a high mountain species, occurring up to 3100 m, mainly restricted to the eastern Anatolian region. It is only sparsely collected in Turkey (3 provinces).
 Distribution: H. kurdus is according to present knowledge a purely Turkish species. Provinces: Hakkâri (type locality, 2600–3000 m), Bitlis (2500–3100 m) (WARNCKE 1992); Van (2500–2600 m).
description: Published as part of Özbek, Hikmet & Dathe, Holger H., 2020, The bees of the genus Hylaeus FABRICIUS, 1793 of Turkey, with keys to the subgenera and species (Hymenoptera: Anthophila, Colletidae), pp. 273-346 in Beiträge Zur Entomologie = Contributions to Entomology 70 (2) on page 306, DOI: 10.21248/contrib.entomol.70.2.273-346, http://zenodo.org/record/5742898
An extragalactic HII region in the Virgo cluster
Creators: name: Cortese, L.
name: Gavazzi, G.
name: Boselli, A.
name: Iglesias-Paramo, J.
Publisher: name: arXiv
Year: 2003
Subjects: subject: Astrophysics (astro-ph)
subject: FOS: Physical sciences

description: We present spectroscopic observations for six emission-line objects projected onto the Virgo cluster. These sources have been selected from narrow band (Hα+[NII]) images showing faint detectable continuum emission and EW>100 Angstrom. Five of these sources result [OIII]λ5007 emitters at z ~ 0.31, while one 122603+130724 is confirmed to be an HII region belonging to the Virgo cluster. This point-like source has a recessional velocity of ~ 200 km/s, and is associated with the giant galaxy VCC873 (NGC 4402). It has a higher luminosity, star formation rate and metallicity than the extragalactic HII region recently discovered near the Virgo galaxy VCC836 by Gerhard et al. (2002).
description: 7 pages, 2 figures, 4 tables. Accepted for publication on A&A. High resolution figures and FITS images available at http://goldmine.mib.infn.it/papers/vcc873.html
The Information Content of Treasury Bond Options Concerning Future Volatility and Price Jumps
Creators: name: Busch, Thomas
name: Jesper Christensen, Bent
name: Orregaard Nielsen, Morten
name: Busch, Thomas
name: Jesper Christensen, Bent
name: Orregaard Nielsen, Morten
Publisher: name: Unknown
Year: 2006
Subjects: subject: Financial Economics
subject: Bipower variation
subject: bond futures options
subject: HAR
subject: Heterogeneous Autoregressive Model
subject: implied volatility
subject: jumps
subject: realized volatility
subject: VecHAR
subject: volatility forecasting

description: We study the relation between realized and implied volatility in the bond market. Realized volatility is constructed from high-frequency (5-minute) returns on 30 year Treasury bond futures. Implied volatility is backed out from prices of associated bond options. Recent nonparametric sta- tistical techniques are used to separate realized volatility into its continuous sample path and jump components, thus enhancing forecasting performance. We generalize the heterogeneous autoregres- sive (HAR) model to include implied volatility as an additional regressor, and to the separate forecasting of the realized components. We also introduce a new vector HAR (VecHAR) model for the resulting simultaneous system, controlling for possible endogeneity of implied volatility in the forecasting equations. We show that implied volatility is a biased and inefficient forecast in the bond market. However, implied volatility does contain incremental information about future volatil- ity relative to both components of realized volatility, and even subsumes the information content of daily and weekly return based measures. Perhaps surprisingly, the jump component of realized bond return volatility is, to some extent, predictable, and bond options appear to be calibrated to incorporate information about future jumps in Treasury bond prices, and hence interest rates.
Andrena (Melandrena) perimelas Cockerell 1905
Creators: name: Pedro, Diego De
name: Ceccarelli, Fadia Sara
name: Sagot, Philippe
name: López-Reyes, Eulogio
name: Mullins, Jessica L.
name: Mérida-Rivas, Jorge A.
name: Falcon-Brindis, Armando
name: Griswold, Terry
name: Ascher, John S.
name: Gardner, Joel
name: Ayala, Ricardo
name: Vides-Borrell, Eric
name: Vandame, Rémy
Publisher: name: Zenodo
Year: 2024
Subjects: Biodiversity
Taxonomy
Animalia
Arthropoda
Insecta
Hymenoptera
Andrenidae
Andrena
Andrena perimelas

description: Andrena (Melandrena) perimelas Cockerell, 1905
[Holotype: CASC; ♀ Los Angeles, California, US]
This species inhabits the Coastal Sage Matorral in BC and has been reported near Ensenada city (Bouseman & LaBerge 1978). During this project, one female was collected in April 2021 in the Coastal Sage Matorral in Ejido A. Melendrez (MABC). See fig. 14.
description: Published as part of Pedro, Diego De, Ceccarelli, Fadia Sara, Sagot, Philippe, López-Reyes, Eulogio, Mullins, Jessica L., Mérida-Rivas, Jorge A., Falcon-Brindis, Armando, Griswold, Terry, Ascher, John S., Gardner, Joel, Ayala, Ricardo, Vides-Borrell, Eric & Vandame, Rémy, 2024, Revealing the Baja California Peninsula's Hidden Treasures: An Annotated checklist of the native bees (Hymenoptera: Apoidea: Anthophila), pp. 1-391 in Zootaxa 5522 (1) on page 58, DOI: 10.11646/zootaxa.5522.1.1, http://zenodo.org/record/13920532
Hylaeus (Hylaeus) monedulus
Creators: name: Özbek, Hikmet
name: Dathe, Holger H.
Publisher: name: Zenodo
Year: 2020
Subjects: Biodiversity
Taxonomy
Animalia
Arthropoda
Insecta
Hymenoptera
Colletidae
Hylaeus
Hylaeus monedulus

description: Hylaeus (Hylaeus) monedulus (WARNCKE, 1992)
Fig. 6
 Prosopis (Prosopis) monedula WARNCKE, 1992: 790, 801, .
Turkey: Nemrut Dag.
 Hylaeus (Hylaeus) monedulus (WARNCKE, 1992) – ITIS (2020).
 Remarks: It is a small, hardly known species. Its sculpture is generally smooth with strong punctation. H. fedtschenkoi resembles it most of all, but is less shiny. Furthermore, the male’s scape is shorter, the mask with distinct and deep punctation. In both sexes the antennae are short, the outline of the head is broadly trapezoidal. The species is not comparable with H. communis, at most with H. piotris DATHE & PROSHCHALYKIN, 2018, which appears slimmer in habitus, face and scapes.
 Distribution: H. monedulus was described from Bitlis (Nemrut Mt, 2000 m) as indigenous in Turkey, represented by only two specimens ( and , Fig. 17.4). No new material was available for the present study.
description: Published as part of Özbek, Hikmet & Dathe, Holger H., 2020, The bees of the genus Hylaeus FABRICIUS, 1793 of Turkey, with keys to the subgenera and species (Hymenoptera: Anthophila, Colletidae), pp. 273-346 in Beiträge Zur Entomologie = Contributions to Entomology 70 (2) on page 307, DOI: 10.21248/contrib.entomol.70.2.273-346, http://zenodo.org/record/5742898
Influence of the growth conditions on the magnetism of SrFe$_{12}$O$_{19}$ thin films and the behavior of Co / SrFe$_{12}$O$_{19}$ bilayers
Creators: name: Soria, G. D.
name: Marco, J. F.
name: Mandziak, A.
name: Sánchez-Cortés, S.
name: Sánchez-Arenillas, M.
name: Prieto, J. E.
name: Dávalos, J.
name: Foerster, M.
name: Aballe, L.
name: López-Sánchez, J.
name: Guzmán-Mínguez, J. C.
name: Granados-Miralles, C.
name: de la Figuera, J.
name: Quesada, A.
Publisher: name: arXiv
Year: 2020
Subjects: subject: Materials Science (cond-mat.mtrl-sci)
subject: Applied Physics (physics.app-ph)
subject: FOS: Physical sciences

description: SrFe$_{12}$O$_{19}$ (SFO) films grown on Si (100) substrates by radio-frequency magnetron sputtering have been characterized in terms of composition, structural and magnetic properties by a combination of microscopy, diffraction and spectroscopy techniques. Mössbauer spectroscopy was used to determine the orientation of the films magnetization, which was found to be controlled by both the sputtering power and the thickness of the films. Additionally, the coupling between the SFO films and a deposited cobalt overlayer was studied by means of synchrotron-based spectromicroscopy techniques. A structural coupling at the SFO/Co interface is suggested to account for the expetimental observations. Micromagnetic simulations were performed in order to reproduce the experimental behaviour of the system.
description: 17 pages, 11 figures. Submitted to Journal of Physics D: Applied Physics. Second version, improved after first round of reviews
Superfluid phases induced by the dipolar interactions
Creators: name: Kraus, Rebecca
name: Biedroń, Krzysztof
name: Zakrzewski, Jakub
name: Morigi, Giovanna
Publisher: name: arXiv
Year: 2020
Subjects: subject: Quantum Gases (cond-mat.quant-gas)
subject: FOS: Physical sciences

description: We determine the quantum ground state of dipolar bosons in a quasi-one-dimensional optical lattice and interacting via $s$-wave scattering. The Hamiltonian is an extended Bose-Hubbard model which includes hopping terms due to the interactions. We identify the parameter regime for which the coefficients of the interaction-induced hopping terms become negative. For these parameters we numerically determine the phase diagram for a canonical ensemble and by means of density matrix renormalization group. We show that at sufficiently large values of the dipolar strength there is a quantum interference between the tunneling due to single-particle effects and the one due to the interactions. Because of this phenomenon, incompressible phases appear at relatively large values of the single-particle tunneling rates. This quantum interference cuts the phase diagram into two different, disconnected superfluid phases. In particular, at vanishing kinetic energy, the phase is always superfluid with a staggered superfluid order parameter. These dynamics emerge from quantum interference phenomena between quantum fluctuations and interactions and shed light into their role in determining the thermodynamic properties of quantum matter.
Locus-of-control, age, and education as correlates to satisfaction with foreign service life in a sample of foreign service spouses
Creators: name: Herbert, April Peck
Publisher: name: ProQuest
Year: 2023
Subjects: classificationCode: 39
subject: Education
classificationCode: 3904
subject: Specialist studies in education

description: This study proposes to (a) ascertain the relationship of locus of control, age, and educational level to extent of satisfaction with Foreign Service life in a sample of female spouses of American Foreign Service employees assigned to the United States embassies in La Paz, Bolivia; Havana, Cuba; Santo Domingo, Dominican Republic; and Managua, Nicaragua, and (b) to interpret the findings for their meaning to prospective spouses and to U.S. Department of State personnel responsible for spouse and family support programs, such as Overseas Briefing Center, Family Liaison Office, and Community Liaison Officers. The Rotter Internal-External Locus of Control Scale, the Foreign Service Spouse Satisfaction Inventory, and a Personal Data Inventory were used respectively to assess internal or external locus-of-control orientation; satisfaction with the mobility, sociocultural, and personal aspects of Foreign Service life; and personal characteristics such as age and education. These instruments were completed by 89 Foreign Service spouses from the above embassy communities during October/November 1992. Statistical analysis using t tests indicated no significant differences (p $<$.05) in mean satisfaction with Foreign Service life scores between those subjects with internal versus external locus of control, between those subjects "under age 35" or "age 35 and over," or between those subjects with "less than a bachelor's degree" versus those subjects with a "bachelor's degree or higher." Analysis of variance results indicated that internal spouses "age 35 and over" and spouses with "less than a bachelor's degree" did not show the highest level of satisfaction with Foreign Service life, indicating that education and locus of control and age and locus of control did not interact to have an effect on satisfaction with Foreign Service life. Correlational analysis indicated that satisfaction with Foreign Service life was not found to be significantly correlated with locus of control. The writer concluded that the complexity of Foreign Service life is such as to preclude prediction of satisfaction of the female spouse with it on the basis of a variable or variables considered individually. Such prediction would be better made on the basis of a number of variables considered in combination with each other.
POLAR CODES WITH ENHANCED MACHINE LEARNING
Publisher: name: University of Virginia
Year: 2025
Subjects: 5G, 6G, Wireless Digital

description: Arikan (2009) introduced a revolutionary approach to achieving capacity on binary memoryless channels,
 known as polar coding. The list decoding, particularly accompanied by use of CRC outer code, gives dramatic improvement in block error and bit error probabilities. We look for managing performance across varying signal-to-noise ratios (SNR), for digital wireless communication system.
Machine learning presents a promising solution to develop more robust and intelligent decoding strategies.
We study and do the comparison of traditional and Machine Learning Performance with Polar codes.
Finite Sample Comparison of Parametric, Semiparametric, and Wavelet Estimators of Fractional Integration
Creators: name: Orregaard Nielsen, Morten
name: Frederiksen, Per
name: Orregaard Nielsen, Morten
name: Frederiksen, Per
Publisher: name: Unknown
Year: 2005
Subjects: subject: Financial Economics
subject: Bias
subject: finite sample distribution
subject: fractional integration
subject: maximum likelihood
subject: Monte Carlo simulation
subject: parametric estimation
subject: semiparmetric

description: In this paper we compare through Monte Carlo simulations the finite sample properties of estimators of the fractional differencing parameter, d. This involves frequency domain, time domain, and wavelet based approaches and we consider both parametric and semiparametric estimation methods. The estimators are briefly introduced and compared, and the criteria adopted for measuring finite sample performance are bias and root mean squared error. Most importantly, the simulations reveal that 1) the frequency domain maximum likelihood procedure is superior to the time domain parametric methods, 2) all the estimators are fairly robust to conditionally heteroscedastic errors, 3) the local polynomial Whittle and bias reduced log-periodogram regression estimators are shown to be more robust to short-run dynamics than other semiparametric (frequency domain and wavelet) estimators and in some cases even outperform the time domain parametric methods, and 4) without sufficient trimming of scales the wavelet based estimators are heavily biased.
Andrena (Melandrena) sola Viereck 1916
Creators: name: Pedro, Diego De
name: Ceccarelli, Fadia Sara
name: Sagot, Philippe
name: López-Reyes, Eulogio
name: Mullins, Jessica L.
name: Mérida-Rivas, Jorge A.
name: Falcon-Brindis, Armando
name: Griswold, Terry
name: Ascher, John S.
name: Gardner, Joel
name: Ayala, Ricardo
name: Vides-Borrell, Eric
name: Vandame, Rémy
Publisher: name: Zenodo
Year: 2024
Subjects: Biodiversity
Taxonomy
Animalia
Arthropoda
Insecta
Hymenoptera
Andrenidae
Andrena
Andrena sola

description: Andrena (Melandrena) sola Viereck, 1916
[Holotype: ANSP; ♀ Southern California, US; 1880]
This species was previously reported in the Coastal Sage Matorral and the Chaparral ecoregions of BC (Bouseman & LaBerge 1978). We confirmed three specimens reported by Bouseman & W. LaBerge (1978), collected in La Zapopita, Valle de La Trinidad (Chaparral) in March, 1961. Additionally, The BBPT collected two females in the Central Desert in March 2021, and one female in April 2021 in the Baja California Mountains. Voucher specimens are in the BBSL, MABC, and ECOAB collections. See fig. 14.
description: Published as part of Pedro, Diego De, Ceccarelli, Fadia Sara, Sagot, Philippe, López-Reyes, Eulogio, Mullins, Jessica L., Mérida-Rivas, Jorge A., Falcon-Brindis, Armando, Griswold, Terry, Ascher, John S., Gardner, Joel, Ayala, Ricardo, Vides-Borrell, Eric & Vandame, Rémy, 2024, Revealing the Baja California Peninsula's Hidden Treasures: An Annotated checklist of the native bees (Hymenoptera: Apoidea: Anthophila), pp. 1-391 in Zootaxa 5522 (1) on page 58, DOI: 10.11646/zootaxa.5522.1.1, http://zenodo.org/record/13920532
Wave propagation in a chiral fluid: an undergraduate study
Creators: name: Garel, T.
Publisher: name: arXiv
Year: 2003
Subjects: subject: Physics Education (physics.ed-ph)
subject: FOS: Physical sciences

description: We study the propagation of electromagnetic waves in a chiral fluid, where the molecules are described by a simplified version of the Kuhn coupled oscillator model. The eigenmodes of Maxwell's equations are circularly polarized waves. The application of a static magnetic field further leads to a magnetochiral term in the index of refraction of the fluid, which is independent of the wave polarization. A similar result holds when absorption is taken into account. Interference experiments and photochemical reactions have recently demonstrated the existence of the magnetochiral term. The comparison with Faraday rotation in an achiral fluid emphasizes the different symmetry properties of the two effects.
The Discount Rate and the Value of Remaining Years of Life
Creators: name: Hartwick, John
name: Hartwick, John
Publisher: name: Unknown
Year: 2008
Subjects: subject: Consumer/Household Economics
subject: Financial Economics
subject: discount rate
subject: value of life

description: We back out an estimate of a personal discount rate of between 3 and 4 percent for a person with a life expectancy of 74 years who dies at age 30 (or 40) and has a value of statistical life of $6.3 million. Central to these calculations is the series generated by Murphy and Topel of value of life years (the dollar value of consumption plus the dollar value of leisure, with some smoothing for income in retirement). We employ the Makeham "model" of life expectancy in our calculations.
Toward an Effective CFT$_2$ from $\mathcal{N}=4$ Super Yang-Mills and Aspects of Hawking Radiation
Creators: name: Nian, Jun
name: Zayas, Leopoldo A. Pando
Publisher: name: arXiv
Year: 2020
Subjects: subject: High Energy Physics - Theory (hep-th)
subject: General Relativity and Quantum Cosmology (gr-qc)
subject: FOS: Physical sciences

description: Using $\mathcal{N}=4$ supersymmetric Yang-Mills theory we recover important aspects of the near-extremal thermodynamics of AdS$_5$ black holes including both the outer and the inner horizons with their corresponding entropy and energy. This $\mathcal{N}=4$ supersymmetric Yang-Mills theory approach to black hole thermodynamics leads to an effective CFT$_2$ interpretation similar to the work by Callan and Maldacena. We corroborate this effective CFT$_2$ by implementing a particular near-horizon limit that geometrizes the Virasoro algebras as asymptotic symmetries. Using the effective CFT$_2$ picture, we discuss aspects of the Hawking radiation rate for a region of the near-extremal AdS$_5$ black hole quantum evolution.
description: 26 pages, 1 figure; V2: Sec 4.2 expanded with details, and more references added; V3: A figure clarifying the supersymmetric and the extremal conditions is inserted. An alternative streamlined computation of the right central charge is now included. Results unchanged
Sequential Estimation of Structural Models with a Fixed Point Constraint
Creators: name: Kasahara, Hiroyuki
name: Shimotsu, Katsumi
name: Kasahara, Hiroyuki
name: Shimotsu, Katsumi
Publisher: name: Unknown
Year: 2008
Subjects: subject: Financial Economics
subject: contraction
subject: dynamic games
subject: nested pseudo likelihood
subject: recursive projection method

description: This paper considers the estimation problem of structural models for which empirical restrictions are characterized by a fixed point constraint, such as structural dynamic discrete choice models or models of dynamic games. We analyze the conditions under which the nested pseudo-likelihood (NPL) algorithm achieves convergence and derive its convergence rate. We find that the NPL algorithm may not necessarily converge when the fixed point mapping does not have a local contraction property. To address the issue of non-convergence, we propose alternative sequential estimation procedures that can achieve convergence even when the NPL algorithm does not. Upon convergence, some of our proposed estimation algorithms produce more efficient estimators than the NPL estimator.
Promotion Tournaments in Market Equilibrium
Creators: name: Zabojnik, Jan
name: Zabojnik, Jan
Publisher: name: Unknown
Year: 2008
Subjects: Financial Economics
Labor and Human Capital

description: Standard models of promotion tournaments assume that firms can commit to arbitrary tournament prizes. In this paper, a firm's ability to adjust tournament prizes is constrained by the outside labor market, through the wages other firms are willing to offer to the promoted and unpromoted workers. The paper shows that sufficiently patient firms may be able to retain some control over the tournament prizes through a relational contract, but if the firms are competitive, full efficiency does not obtain in equilibrium even for discount factors arbitrarily close to one. Full efficiency, however, may be feasible in firms with supranormal profits (monopolistic firms). The paper also shows that a minimum wage regulation distorts the workers' investments in human capital by restricting the firms' abilities to design efficient promotion tournaments. A minimum wage thus leads to underinvestment in competitive firms, but could lead to excessive human capital accumulation in monopolistic firms.
The relationship between maternal employment history and young adults' perceptions of work and family
Creators: name: Miller, Carol J.
Publisher: name: ProQuest
Year: 2023
Subjects: classificationCode: 52
subject: Psychology
subject: FOS: Psychology
classificationCode: 5201
subject: Applied and developmental psychology
classificationCode: 5203
subject: Clinical and health psychology

description: This study focused on the impact of maternal employment and gender on egalitarianism, career and family plans, and perceptions of family relationships in young adults. One hundred twenty-one undergraduate students were divided into three groups based on their maternal employment status: full-time, part-time, and nonworking. They were administered a series of tasks designed to assess their attitudes toward maternal employment, views of sex roles, perceptions of the quality of their relationship with their own parents, and plans for working and raising a family. The measures differed in their level of directness in an attempt to reveal less accessible thoughts and feelings. Maternal employment was related to perceptions of greater benefits and fewer costs of maternal employment for children, paternal dissatisfaction with working, regrets about maternal employment, and more strained father-child relations. For the most part, subjects did not differ as a function of maternal employment status on measures of egalitarianism and career and family plans. Contrary to expectations, maternal employment status generally did not have a different impact depending on gender, and directness of measure did not appear to be a factor in most cases. Overall, gender seemed to influence responses more clearly than maternal employment status. Women were more positive about the consequences of maternal employment for children, more egalitarian, more positive about their relationship with their parents, especially their mothers, and less conflicted about separation issues. Men and women were both fairly traditional in their role expectations when describing career and family plans. Secondary analyses of the role of divorce and child care arrangements revealed qualifications of the effects of maternal employment and suggested interesting avenues for further research. The study pointed out important differences between general attitudes toward maternal employment and views of one's own family experiences, the complexity of maternal employment effects, the enduring influence of gender, and the need to design creative, multivariate approaches to examining maternal employment.
Momentum-resolved analysis of condensate dynamic and Higgs oscillations in quenched superconductors with tr-ARPES
Creators: name: Schwarz, Lukas
name: Fauseweh, Benedikt
name: Manske, Dirk
Publisher: name: arXiv
Year: 2020
Subjects: subject: Superconductivity (cond-mat.supr-con)
subject: FOS: Physical sciences

description: Higgs oscillations in nonequilibrium superconductors provide an unique tool to obtain information about the underlying order parameter. Several properties like the absolute value, existence of multiple gaps and the symmetry of the order parameter can be encoded in the Higgs oscillation spectrum. Studying Higgs oscillations with time-resolved angle-resolved photoemission spectroscopy (ARPES) has the advantage over optical measurements that a momentum-resolved analysis of the condensate dynamic is possible. In this paper, we investigate the time-resolved spectral function measured in ARPES for different quench protocols. We find that analyzing amplitude oscillations of the ARPES intensity in the whole Brillouin zone allows to understand how the condensate dynamic contributes to the emerging of collective Higgs oscillations. Furthermore, by evaluating the phase of these oscillations the symmetry deformation dynamic of the condensate can be revealed, which gives insight about the ground state symmetry of the system. With such an analysis, time-resolved ARPES experiments might be used in future as a powerful tool in the field of Higgs spectroscopy.
description: 15 pages, 9 figures, updated and extended
Consequences of preserving reversibility in quantum superchannels
Creators: name: Yokojima, Wataru
name: Quintino, Marco Túlio
name: Soeda, Akihito
name: Murao, Mio
Publisher: name: arXiv
Year: 2020
Subjects: subject: Quantum Physics (quant-ph)
subject: FOS: Physical sciences

description: Similarly to quantum states, quantum operations can also be transformed by means of quantum superchannels, also known as process matrices. Quantum superchannels with multiple slots are deterministic transformations whichtake independent quantum operations as inputs. While they are enforced to respect the laws of quantum mechanics, the use of input operations may lack a definite causal order, and characterizations of general superchannels in terms of quantum objects with a physical implementation have been missing. In this paper, we provide a mathematical characterization for pure superchannels with two slots (also known as bipartite pure processes), which are superchannels preserving the reversibility of quantum operations. We show that the reversibility preserving condition restricts all pure superchannels with two slots to be either a quantum circuit only consisting of unitary operations or a coherent superposition of two unitary quantum circuits where the two input operations are differently ordered. The latter may be seen as a generalization of the quantum switch, allowing a physical interpretation for pure two-slot superchannels. An immediate corollary is that purifiable bipartite processes cannot violate device-independent causal inequalities.
description: 59 pages, 22 figures. Many parts of the text and some figures were improved. The key ideas of the proofs for the main results are presented. Minor changes from v3 and v4
What Drives the Trade Purchaser’s Decision to Purchase a Specific Wine?
Creators: name: McGarry Wolf, Marianne
name: Higgins, Lindsey M.
name: McGarry Wolf, Marianne
name: Higgins, Lindsey M.
Publisher: name: Unknown
Year: 2017
Subjects: subject: Agricultural and Food Policy
subject: Food Consumption/Nutrition/Food Safety
subject: Food Security and Poverty
subject: AVA
subject: retail
subject: trade purchasers
subject: wine bars
subject: wine region

description: Trade purchasers, who decide which wines will be sold at retail outlets, have significant purchasing power and influence on the wine industry. Research has shown that consumers perceive the region where wine is produced to have an impact on wine quality (Johnson and Bruwer, 2007). Additional research indicates that wines from different regions generate different market prices (Schamel and Anderson, 2003). How does region influence trade purchasers? This research examines the attitudes of trade wine purchasers regarding drivers of purchase decisions, their familiarity with California growing regions, how often wine region influences their purchase decisions, and their wine quality perceptions based on region. Differences based on business type and location were examined. A November 2014 survey used a database of 1,785 email addresses and had a response rate of 8.5%. Respondents were from 29 states, with the most responses from Florida (24%) and California (22%). A quarter of responses were retail-only buyers, half were from on-premise businesses, and another quarter were from wine bars (8% of which were also wine shops). Respondents were asked to rate the desirability of eight wine features. Features indicated as very desirable were premium quality product and grapes are from a respected wine grape growing region. The characteristics from a well known AVA, sustainably produced, cool climate grapes, and produced in California were rated somewhat to very desirable. Somewhat desirable features were high Wine Spectator rating and high Robert Parker rating. When choosing a wine, 44% choose based on production location always or very often and 88% make the decision based on location at least somewhat often. This is similar to 83% of respondents indicating that well known region is extremely or very desirable. Respondents from the Midwest and the East rated both grapes are from a respected wine grape growing region and from a well known AVA higher than California respondents did. Wine bars rated sustainably produced and produced from cool climate grapes as more desirable than retail outlets did. Respondents were very familiar with California regions examined, with Napa and Sonoma rating most familiar and highest quality. This research shows that trade decision makers use growing region to decide which wines to purchase. Therefore, it is important for wine regions to allocate resources toward trade education concerning characteristics of their growing region and its quality.
The relationship between maternal employment history and young adults' perceptions of work and family
Creators: name: Miller, Carol J.
Publisher: name: American University
Year: 2023

description: This study focused on the impact of maternal employment and gender on egalitarianism, career and family plans, and perceptions of family relationships in young adults. One hundred twenty-one undergraduate students were divided into three groups based on their maternal employment status: full-time, part-time, and nonworking. They were administered a series of tasks designed to assess their attitudes toward maternal employment, views of sex roles, perceptions of the quality of their relationship with their own parents, and plans for working and raising a family. The measures differed in their level of directness in an attempt to reveal less accessible thoughts and feelings. Maternal employment was related to perceptions of greater benefits and fewer costs of maternal employment for children, paternal dissatisfaction with working, regrets about maternal employment, and more strained father-child relations. For the most part, subjects did not differ as a function of maternal employment status on measures of egalitarianism and career and family plans. Contrary to expectations, maternal employment status generally did not have a different impact depending on gender, and directness of measure did not appear to be a factor in most cases. Overall, gender seemed to influence responses more clearly than maternal employment status. Women were more positive about the consequences of maternal employment for children, more egalitarian, more positive about their relationship with their parents, especially their mothers, and less conflicted about separation issues. Men and women were both fairly traditional in their role expectations when describing career and family plans. Secondary analyses of the role of divorce and child care arrangements revealed qualifications of the effects of maternal employment and suggested interesting avenues for further research. The study pointed out important differences between general attitudes toward maternal employment and views of one's own family experiences, the complexity of maternal employment effects, the enduring influence of gender, and the need to design creative, multivariate approaches to examining maternal employment.