cometadata/datacite-rtg-text-other-reclassification-records huggingface dataset:
Multiwavelength study of RX J2015.6+3711: a magnetic cataclysmic variable with a 2-hr spin period
Creators: name: Zelati, Francesco Coti
name: Rea, Nanda
name: Campana, Sergio
name: De Martino, Domitilla
name: Papitto, Alessandro
name: Safi-Harb, Samar
name: Torres, Diego F.
Publisher: name: arXiv
Year: 2015
Subjects: subject: High Energy Astrophysical Phenomena (astro-ph.HE)
subject: FOS: Physical sciences

description: The X-ray source RX J2015.6+3711 was discovered by ROSAT in 1996 and recently proposed to be a cataclysmic variable (CV). Here we report on an XMM-Newton observation of RX J2015.6+3711 performed in 2014, where we detected a coherent X-ray modulation at a period of 7196+/-11 s, and discovered other significant (>6sigma) small-amplitude periodicities which we interpret as the CV spin period and the sidebands of a possible ~12 hr periodicity, respectively. The 0.3-10 keV spectrum can be described by a power law (Gamma = 1.15+/-0.04) with a complex absorption pattern, a broad emission feature at 6.60+/-0.01 keV, and an unabsorbed flux of (3.16+/-0.05)x10^{-12} erg/s/cm^2. We observed a significant spectral variability along the spin phase, which can be ascribed mainly to changes in the density of a partial absorber and the power law normalization. Archival X-ray observations carried out by the Chandra satellite, and two simultaneous X-ray and UV/optical pointings with Swift, revealed a gradual fading of the source in the soft X-rays over the last 13 years, and a rather stable X-ray-to-optical flux ratio (F_X/F_V ~1.4-1.7). Based on all these properties, we identify this source with a magnetic CV, most probably of the intermediate polar type. The 2 hr spin period makes RX J2015.6+3711 the second slowest rotator of the class, after RX J0524+4244 ("Paloma", P_spin~2.3 hr). Although we cannot unambiguously establish the true orbital period with these observations, RX J2015.6+3711 appears to be a key system in the evolution of magnetic CVs.
description: 11 pages, 8 figures, accepted for publication on MNRAS
The Challenge to Rural Sociological Research in the United States
Creators: name: Youngblood, B.
name: Youngblood, B.
Publisher: name: Unknown
Year: 1932
Subjects: Community/Rural/Urban Development
Research Methods/ Statistical Methods

description: Excerpt: Present interest in rural sociological research and education is an outgrowth of the report of the Commission on Country Life, made early in 1909. In appointing the Commission, President Roosevelt made a significant statement that holds good today. He said: "It is at least as important that the farmer should get the largest possible return in money, comfort, and social advantages from the crops he grows, as that he should get the largest possible return in crops from the land he farms. Agriculture is not the whole of country life. The great rural interests are human interests, and good crops are of little value to the farmer unless, they open the door to a good kind of life on the farm." To discover and evaluate the essentials of human advancement, and to join forces with other constructive minds in the task of helping rural people to attain and enjoy them, is the challenge with which the rural sociologists of the United States are confronted; this challenge must be met in a spirit of fidelity to scientific processes of reasoning and of devotion to the cause of rural human achievement. That it will be met in this spirit, the evidence gathered in connection with the preparation of this paper is assuring.
description: Paper prepared for presentation before the subsection of experiment station work of the Association of Land-Grant Colleges and Universities at its meeting in Washington, in November 1932.
Lowering the lasing threshold of distributed feedback lasers with loss
Creators: name: Shishkov, V. Yu.
name: Zyablovsky, A. A.
name: Andrianov, E. S.
name: Pukhov, A. A.
name: Vinogradov, A. P.
name: Dorofeenko, A. V.
name: Lisyansky, A. A.
Publisher: name: arXiv
Year: 2015
Subjects: subject: Optics (physics.optics)
subject: FOS: Physical sciences

description: We study laser generation in 1D distributed feedback lasers with amplifying and lossy layers. We show that when the lasing frequency differs from the transition frequencies of the amplifying medium, loss induced lasing may occur due to the broadening of the resonator mode with increasing loss in the absorbing layers. This broadening leads to a shift in the lasing frequency towards the transition frequency. As a result, the cavity mode interaction with the amplifying medium is enhanced, and the lasing threshold is lowered.
Mental Wormholes and the Inner Workings of Creative Thought
Creators: name: Gabora, Liane
Publisher: name: arXiv
Year: 2015
Subjects: subject: Neurons and Cognition (q-bio.NC)
subject: FOS: Biological sciences

description: Most creative outputs are readily classified as belonging to a particular domain such as art, music, or technology. But does that mean the creative thinking that goes into creative projects respects these conventional domain boundaries? This question provides the departure point for this chapter. It is an important question because the answer has implications for how the creative process works, as well as for computational models of creativity, and thus it provides the departure point for this chapter. Next we look at how the creator sifts out from its vast contents those items to incorporate into a creative project, and converts these raw materials into a form that "gels" with the project. We then explore the hypothesis that the creative mind forges "mental wormholes" that connect concepts and percepts, often from seemingly disparate domains. Finally, we take a brief look at the strangely non-compositional interactions that take place in these mental wormholes, and techniques being advanced to model and understand these interactions.
description: 10 pages
Priori-Information Aided Iterative Hard Threshold: A Low-Complexity High-Accuracy Compressive Sensing Based Channel Estimation for TDS-OFDM
Creators: name: Gao, Zhen
name: Zhang, Chao
name: Wang, Zhaocheng
name: Chen, Sheng
Publisher: name: arXiv
Year: 2015
Subjects: subject: Information Theory (cs.IT)
subject: FOS: Computer and information sciences

description: This paper develops a low-complexity channel estimation (CE) scheme based on compressive sensing (CS) for time-domain synchronous (TDS) orthogonal frequency-division multiplexing (OFDM) to overcome the performance loss under doubly selective fading channels. Specifically, an overlap-add method of the time-domain training sequence is first proposed to obtain the coarse estimates of the channel length, path delays and path gains of the wireless channel, by exploiting the channel's temporal correlation to improve the robustness of the coarse CE under the severe fading channel with long delay spread. We then propose the priori-information aided (PA) iterative hard threshold (IHT) algorithm, which utilizes the priori information of the acquired coarse estimate for the wireless channel and therefore is capable of obtaining an accurate channel estimate of the doubly selective fading channel. Compared with the classical IHT algorithm whose convergence requires the $l_2$ norm of the measurement matrix being less than 1, the proposed PA-IHT algorithm exploits the priori information acquired to remove such a limitation as well as to reduce the number of required iterations. Compared with the existing CS based CE method for TDS-OFDM, the proposed PA-IHT algorithm significantly reduces the computational complexity of CE as well as enhances the CE accuracy. Simulation results demonstrate that, without sacrificing spectral efficiency and changing the current TDS-OFDM signal structure, the proposed scheme performs better than the existing CE schemes for TDS-OFDM in various scenarios, especially under severely doubly selective fading channels.
description: 9 pages 8 figures
Robust Preamble Design for Synchronization, Signaling Transmission and Channel Estimation
Creators: name: Gao, Zhen
name: Zhang, Chao
name: Wang, Zhaocheng
Publisher: name: arXiv
Year: 2015
Subjects: subject: Information Theory (cs.IT)
subject: FOS: Computer and information sciences

description: The European second generation digital video broadcasting standard (DVB-T2) introduces a P1 symbol. This P1 symbol facilitates the coarse synchronization and carries 7-bit transmission parameter signaling (TPS), including the fast Fourier transform size, single-input/single-output and multiple-input/single-output transmission modes, etc. However, this P1 symbol suffers from obvious performance loss over fading channels. In this paper, an improved preamble scheme is proposed, where a pair of optimal m sequences are inserted into the frequency domain. One sequence is used for carrier frequency offset (CFO) estimation, and the other carries TPS to inform the receiver about the transmission configuration parameters. Compared with the conventional preamble scheme, the proposed preamble improves CFO estimation performance and the signaling capacity. Meanwhile, without additional overhead, the proposed scheme exploits more active pilots than the conventional schemes. In this way, it can facilitate the channel estimation, improve the frame synchronization accuracy as well as enhance its robustness to frequency selective fading channels.
description: 8 pages 11 figures. http://ieeexplore.ieee.org/stamp/stamp.jsp?tp=&arnumber=7001610&tag=1
Three Measures of Prenatal Tobacco Use: Methodological Comparisons and Infant Outcomes
Creators: name: McLaughlin, Kirsten Nicole
Publisher: name: The University of North Carolina at Chapel Hill University Libraries
Year: 2019

description: This study examines the association between three measures of prenatal tobacco use (PTU) and compares the predictive validity of these measures for infant sleep and affect. Participants were part of the Prenatal Experiences and Pediatric Sleep Study (PEAPS), a prospective, longitudinal study exploring the association of PTU with infant developmental outcomes (N = 76). Two subjective measures of PTU (one retrospective and one prospective) were collected during pregnancy via an interview and survey. At birth, infant’s umbilical cord was collected and analyzed for level of cotinine. Infant outcomes were measured during a home visit when infants were 3 and 6 months of age that included a week-long sleep assessment (from which actigraphy data was collected). Results showed significant associations between subjective and objective measures of PTU. PTU was significantly correlated with infant sleep outcomes and negative affect such that PTU was associated with longer sleep durations, less night wakings, and increased negative affect. In addition, PTU predicted longer sleep duration, longer longest sleep periods, and fewer night wakings in infants. These results suggest that there is a link between PTU and decreased arousability in infants and sudden infant death syndrome (SIDS).
Quantum state tomography with non-instantaneous measurements, imperfections and decoherence
Creators: name: Six, Pierre
name: Campagne-Ibarcq, Philippe
name: Dotsenko, Igor
name: Sarlette, Alain
name: Huard, Benjamin
name: Rouchon, Pierre
Publisher: name: arXiv
Year: 2015
Subjects: subject: Quantum Physics (quant-ph)
subject: FOS: Physical sciences

description: Tomography of a quantum state is usually based on positive operator-valued measure (POVM) and on their experimental statistics. Among the available reconstructions, the maximum-likelihood (MaxLike) technique is an efficient one. We propose an extension of this technique when the measurement process cannot be simply described by an instantaneous POVM. Instead, the tomography relies on a set of quantum trajectories and their measurement records. This model includes the fact that, in practice, each measurement could be corrupted by imperfections and decoherence, and could also be associated with the record of continuous-time signals over a finite amount of time. The goal is then to retrieve the quantum state that was present at the start of this measurement process. The proposed extension relies on an explicit expression of the likelihood function via the effective matrices appearing in quantum smoothing and solutions of the adjoint quantum filter. It allows to retrieve the initial quantum state as in standard MaxLike tomography, but where the traditional POVM operators are replaced by more general ones that depend on the measurement record of each trajectory. It also provides, aside the MaxLike estimate of the quantum state, confidence intervals for any observable. Such confidence intervals are derived, as the MaxLike estimate, from an asymptotic expansion of multi-dimensional Laplace integrals appearing in Bayesian Mean estimation. A validation is performed on two sets of experimental data: photon(s) trapped in a microwave cavity subject to quantum non-demolition measurements relying on Rydberg atoms; heterodyne fluorescence measurements of a superconducting qubit.
description: 11 pages, 4 figures, submitted
Kompaktne vaakummonokromaator TMC-4
Creators: name: Tiit, Valdur
Publisher: name: Tartu Ülikooli ajaloo küsimusi
Year: 2014

description: Compact Vacuum Monochromator TMC-4 Valdur Tiit At the end of the Soviet times, one of the strongest centres for developing and producing spectroscopic devices in the Soviet Union was located in Tartu. A vacuum monochromator developed by the physicists and engineers of Tartu was given to the University museum in the summer of 2014 by the University of Tartu Institute of Physics Gas Discharge Laboratory. Constructing a short wavelength ultraviolet radiation vacuum monochromator was connected to producing radiation sensors that were, among other things, needed in space instruments. There were only a couple of such instruments in the Soviet Union and Estonian engineers constructed such a device themselves in 1964. The world’s first vacuum monochromator TVM-3 with double reflection diffraction gratings was constructed in Tartu in 1967. During the following years, many more similar instruments were constructed and one of the versions was also patented in the USA and France. Using modern diffraction gratings with variable spacing constructed in the Optical Institute of USSR in Leningrad, small very compact vacuum monochromators TMC-03 (for the Moscow State University) and TMC-04 (remained in Tartu and is in the museum now) were constructed in Tartu in 1989–1990. They mainly function in the spectral range of 100–250 nm, where the resolving power is about 0.05 nm, the source of radiation is a high voltage gas-discharge tube working either on helium or hydrogen. The vacuum monochromator TMC-04 was used in the University of Tartu Institute of Physics for the first time in the world for researching the influence of high and extra high pressure on the optical spectrum of crystals. After the Department of Equipment Development (APES) was closed down in the spring of 1993, the vacuum monochromator TMC-04 was used at the Estonian University of Life Sciences environmental equipment laboratory for studying the transparency of the windows of ionization chambers.
description: Tartu Ülikooli ajaloo küsimusi, No 42 (2014): Ülikool ja keelevahetus
Investigating Clinicians’ Attitudes, Perceptions and Experiences of Delivering Mental Health Interventions to Autistic Individuals During Covid-19
Creators: name: Adams, Lucy
Publisher: name: Open Science Framework
Year: 2022
Subjects: subject: Clinical Psychology
subject: Social and Behavioral Sciences
subject: Psychology
subject: FOS: Psychology

description: The proposed project will ask clinicians to complete a web-based quantitative questionnaire about their attitudes towards, and/or experience of, delivering mental health interventions remotely to autistic individuals.
Tartu Ülikooli ajaloo muuseumi 2013. aasta aruanne
Creators: name: Raisma, Mariann
Publisher: name: Tartu Ülikooli ajaloo küsimusi
Year: 2014

description: Tartu Ülikooli ajaloo küsimusi, No 42 (2014): Ülikool ja keelevahetus
Multi-band theory of superconductivity at the LaAlO$_3$/SrTiO$_3$ interface
Creators: name: Mohanta, N.
name: Taraphder, A.
Publisher: name: arXiv
Year: 2015
Subjects: subject: Superconductivity (cond-mat.supr-con)
subject: FOS: Physical sciences

description: We present a multi-band model for superconductivity at the metallic interface between insulating oxides LaAlO$_3$ and SrTiO$_3$ (001). Using a self-consistent Bogoliubov-de Gennes theory, formulated with the realistic bands at the interface, we investigate the spin-singlet and spin-triplet pairings in intra-band and inter-band channels. We find that the Rashba and atomic spin-orbit interactions at the interface induce singlet pairing in the inter-band channel and triplet pairing in both the intra-band and inter-band channels when the pairing amplitude in the singlet intra-band channel is finite. The gate-voltage variation of superconductivity is resolved in different pairing channels, compared with experimental results and found to match quite well. Interestingly, an enhancement of the superconducting transition temperature by external in-plane magnetic field is found revealing the existence of a hidden superconducting state above the observed one. As the interface is known to possess high level of inhomogeneity, we explore the role of non-magnetic disorder incorporating thermal phase fluctuations by using a Monte-Carlo method. We show that even after the transition to the non-superconducting phase, driven by temperature or magnetic field, the interface possesses localized Cooper pairs whose signature was observed in previous experiments.
description: 10 pages, 8 figures
Modeling Decarbonization Pathways in the Power Sector in Developing Countries: The case of Colombia (EMP-LAC 2023) - Presentation
Creators: name: Niño, Fernando Antonio Plazas
Publisher: name: Zenodo
Year: 2023
Subjects: OSeMOSYS
Power sector
Decarbonization
Policy planning
Energy modeling

description: Colombia requires to decarbonize the power sector in order to achieve the National Determined Contribution (NDC 2020). Variable renewable sources along with energy storage options are critical to accomplish the carbon neutrality options. Using OSeMOSYS framework, the study develops a power sector model for Colombia, and three scenarios are analyzed. The presentation summarizes the project developed as part of the EMP-LAC 2023.
New distributional records of the genus Tetragonoderus Dejean, 1829 from the United States of America, including an updated key to species (Coleoptera: Carabidae)
Creators: name: Pandolfi, Alessandra
name: Schnepp, Kyle
Publisher: name: Fragmenta entomologica
Year: 2024

description: New distributional records are presented for the genus Tetragonoderus Dejean, 1829 from the United States of America. Tetragonoderus fasciatus (Haldeman, 1843) is a new state record for South Dakota, Tetragonoderus intersectus (Germar, 1824) is a new state record for Oklahoma, Tetragonoderus latipennis LeConte, 1874 is a new state record for Florida, Georgia, and Okhlaoma, and Tetragonoderus pallidus Horn, 1869 is a new state record for New Mexico and Utah. New county records for the introduced species Tetragonoderus laevigatus Chaudoir, 1876 in Florida and new state records for Georgia, Louisiana, and Mississippi signify a range extension. A new record of this species from Miami-Dade County from 2004 temporally precedes the known date of introduction. New observational records from citizen science platforms for the reported species are also noted. An updated key and distributional maps to the known species in the USA are also provided.
description: Fragmenta entomologica, Vol. 56 No. 1 (2024)
Primitive points in rational polygons
Creators: name: Bárány, Imre
name: Martin, Greg
name: Naslund, Eric
name: Robins, Sinai
Publisher: name: arXiv
Year: 2015
Subjects: subject: Number Theory (math.NT)
subject: FOS: Mathematics
subject: 11H06, 11P21 (Primary), 52C05 (secondary)

description: Let $\mathcal A$ be a star-shaped polygon in the plane, with rational vertices, containing the origin. The number of primitive lattice points in the dilate $t\mathcal A$ is asymptotically $\frac6{π^2}$ Area$(t\mathcal A)$ as $t\to \infty$. We show that the error term is both $Ω_\pm\big( t\sqrt{\log\log t} \big)$ and $O(t(\log t)^{2/3}(\log\log t)^{4/3})$. Both bounds extend (to the above class of polygons) known results for the isosceles right triangle, which appear in the literature as bounds for the error term in the summatory function for Euler's $ϕ(n)$.
description: 17 pages
Correlation structure and variable selection in generalized estimating equations via composite likelihood information criteria
Creators: name: Nikoloulopoulos, Aristidis K.
Publisher: name: arXiv
Year: 2015
Subjects: subject: Methodology (stat.ME)
subject: Applications (stat.AP)
subject: FOS: Computer and information sciences

description: The method of generalized estimating equations (GEE) is popular in the biostatistics literature for analyzing longitudinal binary and count data. It assumes a generalized linear model (GLM) for the outcome variable, and a working correlation among repeated measurements. In this paper, we introduce a viable competitor: the weighted scores method for GLM margins. We weight the univariate score equations using a working discretized multivariate normal model that is a proper multivariate model. Since the weighted scores method is a parametric method based on likelihood, we propose composite likelihood information criteria as an intermediate step for model selection. The same criteria can be used for both correlation structure and variable selection. Simulations studies and the application example show that our method outperforms other existing model selection methods in GEE. From the example, it can be seen that our methods allow for correct analysis, and may change the inferential results.
The Impact of Competency to Stand Trial and Judicial Instructions on NGRI Verdicts
Creators: name: Kovera, Margaret
Publisher: name: Open Science Framework
Year: 2022
Subjects: subject: Social and Behavioral Sciences
subject: Law
subject: FOS: Law

description: The experiment has a 3 (Instructions: No Instructions vs. Instructions Only vs. Instructions with Explanation) x 2 (Competency: Competent vs. Incompetent) between-subjects factorial design with a total of six conditions. Participants will watch a video of a mock trial which will vary between conditions on the defendant’s reported competency status and the presence and type of judicial instructions administered.
Modeling Decarbonization Pathways in the Power Sector in Developing Countries: The case of Colombia (EMP-LAC 2023) - Poster
Creators: name: Niño, Fernando Antonio Plazas
Publisher: name: Zenodo
Year: 2023
Subjects: OSeMOSYS
Power sector
Decarbonization
Policy planning
Energy modeling

description: Colombia requires to decarbonize the power sector in order to achieve the National Determined Contribution (NDC 2020). Variable renewable sources along with energy storage options are critical to accomplish the carbon neutrality options. Using OSeMOSYS framework, the study develops a power sector model for Colombia, and three scenarios are analyzed. The poster summarizes the project developed as part of the EMP-LAC 2023.
Bilingualism in the Russian Expatriate Communities. Baron Sergei Korff at the Universities of Finland, Estonia and the USA
Creators: name: Petrov, Eugene
Publisher: name: Tartu Ülikooli ajaloo küsimusi
Year: 2014

description: Bilingualism in the Russian Expatriate Communities. Baron Sergei Korff at the Universities of Finland, Estonia and the USA Eugene Petrov St Petersburg State University Individuals who are characterised as bilingual usually speak two languages equally well and choose the language depending mainly of the communication situation. Diglossia refers to a situation where different languages are used in a different social context or social class, and this more likely characterises an entire community. This article discusses how bilingualism and a liberal world view guaranteed success to one of the best Russian administrative law specialists, Baron Sergei Korff (1876–1924), as an emigrant in the USA, on the example of his academic biography. Korff’s fate was in many ways typical to Russian expatriate researchers, but his success occurred quicker than that of many others. At the beginning of the 20th century many European universities preferred to educate their own students to be the next generation of the academia. It was easier for newcomers to find a place in the more open American universities; however, speaking the language was an unavoidable precondition. There are three clearly differentiable stages in the life story of Korff: the periods of St. Petersburg (1876–1905), Helsinki (1905– 1919) and New York (1919–1924), but the reality was more complicated. After studies at the St. Petersburg law school, Baron Korff worked at the University of Helsinki in 1905–1911. His federal views developed during that time and the works cited to this day were published (e.g., Federalism, 1908). In 1911, he completed his PhD in constitutional law (topic: Russian administrative law) at the University of Tartu / University of Jurjev, however, this did not secure him an academic position. Korff became the director of the Slavonic library of the University of Helsinki. He had to hold lectures in many private institutions of higher education in 1914–1916 (women’s courses, commerce courses and lectures at the commerce academy) and, from time to time, he would make an appearance with lecture courses in America. In 1917, he quickly became politically renowned as the assistant to the governor-general of Finland. Up until 1919, Korff participated actively in the Russian emigrant activities in Europe but seeing that the Bolshevik’s secured their power, he immigrated to the USA in 1919. After that, since 1919, he already worked as an emigrant at the universities of Georgetown and Columbia in the USA, where he laid much of the foundations for the Russian studies in the USA. Baron Korff’s wife was American, and the reasons for his thriving and quick success as an emigrant in the USA were mostly his fluent language skills and the vast knowledge about both the European and American academy.
description: Tartu Ülikooli ajaloo küsimusi, No 42 (2014): Ülikool ja keelevahetus
Rashba Torque Driven Domain Wall Motion in Magnetic Helices
Creators: name: Pylypovskyi, Oleksandr V.
name: Sheka, Denis D.
name: Kravchuk, Volodymyr P.
name: Yershov, Kostiantyn V.
name: Makarov, Denys
name: Gaididei, Yuri
Publisher: name: arXiv
Year: 2015
Subjects: subject: Mesoscale and Nanoscale Physics (cond-mat.mes-hall)
subject: Strongly Correlated Electrons (cond-mat.str-el)
subject: FOS: Physical sciences

description: Manipulation of the domain wall propagation in magnetic wires is a key practical task for a number of devices including racetrack memory and magnetic logic. Recently, curvilinear effects emerged as an efficient mean to impact substantially the statics and dynamics of magnetic textures. Here, we demonstrate that the curvilinear form of the exchange interaction of a magnetic helix results in an effective anisotropy term and Dzyaloshinskii--Moriya interaction with a complete set of Lifshitz invariants for a one-dimensional system. In contrast to their planar counterparts, the geometrically induced modifications of the static magnetic texture of the domain walls in magnetic helices offer unconventional means to control the wall dynamics relying on spin-orbit Rashba torque. The chiral symmetry breaking due to the Dzyaloshinskii-Moriya interaction leads to the opposite directions of the domain wall motion in left- or right-handed helices. Furthermore, for the magnetic helices, the emergent effective anisotropy term and Dzyaloshinskii-Moriya interaction can be attributed to the clear geometrical parameters like curvature and torsion offering intuitive understanding of the complex curvilinear effects in magnetism.
Agriculture of the American Indian: A Select Bibliography
Creators: name: Harvey, Cecil L.
name: Harvey, Cecil L.
Publisher: name: Unknown
Year: 1979
Subjects: Crop Production/Industries
Land Economics/Use
Livestock Production/Industries
Resource /Energy Economics and Policy
Teaching/Communication/Extension/Profession

description: Excerpts from the Preface: This work brings up to date the Bibliography on the Agriculture of the American Indians by Everett E. Edwards and Wayne B. Rasmussen, published in 1941 as USDA Miscellaneous Publication 447. The update was done because of a growing interest in the American Indians, a greater ethnic awareness among minority people, and a need for Americans in general to know of the contributions these people have made to the Nation and the world. While this is not a large collection, the subject matter is fairly broad in scope, embodying two continents and about 7,000 years. Various aspects of Indian technology, settlement patterns, economics, family organization, and religious ritual are discussed as they relate to agriculture. The first intention was to limit the material to the United States proper. However, due to cultural diffusion, trade routes, and the fact that native Americans did not have the same borders or political boundaries as did the European settlers, this list of references also contains studies about Mexico, Canada, and Peru. The studies about Mexico and Peru are especially significant because these two countries are the birthplaces of New World agriculture. They also became the most important agricultural centers in the Americas, and perhaps the world, prior to European settlement in the New World. Many of the crops that make up the world's diet were developed in these two countries. The writings, for the most part, discuss research on agriculture when native American cultures were strong and healthy. During this time, Indians developed as much as 60 percent of the crops used in today's diet. Important foods such as potatoes, chocolate, corn, squash, beans, and turkeys are just a small part of their contribution. Their farms ranged from garden size to the size of plantations. Indians also had well developed pharmaceuticals from roots and herbs. The Americas at that time were amazingly abundant in foods that grew wild and the development of agriculture was not really needed by all Indian societies. This bibliography includes references on Indian foods that once grew wild and that are now in the mainstream of contemporary agriculture. Tobacco, tomatoes, and cranberries are examples of these crops.
Rahvusvahelised küsitlusuuringud Tartu Ülikoolis 1990-2014. International Surveys at the University of Tartu in 1990-2014
Creators: name: Ainsaar, Mare
name: Roots, Ave
Publisher: name: Tartu Ülikooli ajaloo küsimusi
Year: 2015

description: This article contributes to the history of science by giving an overview of the international comparative surveys connected to the University of Tartu on the basis of the original questionnaire-based or interview data originating from the period 1990–2014. We got information about 102 projects that were in accordance with the conditions described above. The most common international partners were Finns, Brits, Germans, Swedes, Poles and the Spanish. In terms of topics, most of the surveys were carried out in the field of social sciences in general (71 surveys), followed by health sciences (12 surveys), political science (12 surveys), education (7 surveys) and linguistics (1 survey). In terms of institutional affiliation, the greatest number of surveys were conducted in sociology and social policy (19 surveys), psychology (17 surveys), health sciences (16 surveys), education (15 surveys), social work (10 surveys), law (6 surveys), political science (6 surveys), media (5 surveys), religion (4 surveys), sports (2 surveys), by the Centre for Applied Social Sciences (2 surveys) and in linguistics (1 survey). 56% of the surveys were quantitative, 16% qualitative and 22% used mixed methods. The number of the quantitative surveys has been quite stabile over time, with four new projects starting every year on average, but the amount of qualitative and mixed method projects has risen after 2006. 43% of the surveys were designed to be representative of a group or certain population, 11 surveys were representative of the whole Estonian population. Many projects had only one or two publications, one third of the projects had six or more publications. The European Social Survey project in Estonia had the highest number of publications, publishing 70 additional items every year. A new paradigm cultivated by the European Social Survey was open access data. 12% of data in the surveyed 102 projects had open access data, in 54% of the cases the Estonian and international project team both had the data, in 20% of cases only the Estonian team had the data and in 4% of cases data was given away to the international team.
description: Tartu Ülikooli ajaloo küsimusi, No 43 (2015): Ühiskonda muutvad teadused rahvusülikoolis
Capabilities of future intensity interferometers for observing fast-rotating stars: imaging with two- and three-telescope correlations
Creators: name: Nunez, Paul D.
name: de Souza, Armando Domiciano
Publisher: name: arXiv
Year: 2015
Subjects: subject: Instrumentation and Methods for Astrophysics (astro-ph.IM)
subject: FOS: Physical sciences

description: Future large arrays of telescopes, used as intensity interferometers, can be used to image the surfaces of stars with unprecedented angular resolution. Fast-rotating, hot stars are particularly attractive targets for intensity interferometry since shorter (blue) wavelength observations do not pose additional challenges. Starting from realistic surface brightness simulations of fast-rotating stars, we discuss the capabilities of future intensity interferometers for imaging effects such as gravity darkening and rotational deformation. We find that two-telescope intensity correlation data allow reasonably good imaging of these phenomena, but can be improved with additional higher order (e.g. three-telescope) correlation data, which contain some Fourier phase information.
description: Accepted for publication in MNRAS. 8 pages, 5 figures
"Kultuurrahvaste mentaliteet peab saama enam kollektivistlikumaks" (Dr Juhan Vilmsi sõnad ja teod). The Words and Deeds of Dr Juhan Vilms
Creators: name: Kalling, Ken
Publisher: name: Tartu Ülikooli ajaloo küsimusi
Year: 2015

description: Dr Juhan Vilms (1893–1952) was a remarkable person in pre-war Estonian public and political life, but his contribution has been modestly discussed until today. A practicing physician in Tallinn, he was also active in Estonian abstinence and eugenics movements, and held a high position in the Estonian sports administration. For a short period he was a member of the Estonian Parliament Riigikogu for the Labour Party. Vilms can be remembered by his rather idiosyncratic statements. Already in 1920 he published a book the main argument of which was to introduce polygamy in Estonia (to increase the population in a situation where women were outnumbering men in the post-war years). In the 1930s Vilms advocated fascism and corporatism in his writings. Vilms was motivated to support such viewpoints owing to his eugenic convictions. His main concern was pronatalism—Vilms dreamed of increasing the number of Estonians from one million to at least two. As numerous factors were influencing the demographic situation in the country, Vilms also became involved in many issues from agricultural politics to medical ethics. Despite of being ridiculed, Vilms definitely contributed to the Estonian public health policy. The so-called Congresses of National Breeding organised with his participation in 1927 and 1935 caused the Estonian state to concentrate on important topics connected to public health and demographic improvement. In 1943 Vilms escaped the Nazis and left Estonia for Finland. He died in Argentina.
description: Tartu Ülikooli ajaloo küsimusi, No 43 (2015): Ühiskonda muutvad teadused rahvusülikoolis
Comparison of suckling and artificial rearing on calf growth and milk requirements in pastoral dairy systems
Creators: name: Bryant, Racheal
name: Beckett, Paige
name: Tey, Lucas
name: Burgess, Riki
name: Curtis, Jeffery
name: Heiser, Axel
name: Turner, Sally-Anne
name: Hodgkinson, Alison
Publisher: name: AgResearch
Year: 2025
Subjects: classificationCode: 3003
subject: Animal production

description: Context: Dairy calf-rearing practises have the potential to influence profitability through milk requirements at rearing, and affect lifetime productivity and market access from an animal-welfare perspective.Aims: The aim of this research was to compare calf growth and milk requirements by using conventional artificial rearing (AR) and restricted milk allocation with AR and high milk allocation or suckled calves.Methods: Forty-five Friesian × Jersey calves were allocated to be either AR on 6 L/calf.day, (ARC) or 12 L/calf.day, (ARH), or suckled with dams in a cow–calf contact system using partial contact (15 h/day, CCC). AR calves were fed, and intake measured, using an automatic feeder, whereas CCC calves had access to their dams between 1500 hours and 0600 hours. Calves were transitioned off milk, once they reached at least 75 kg liveweight (LW), by gradually reducing their milk allocation (AR) or reducing access to their dam (CCC).Key results: Milk consumption for ARH was greater than for ARC calves (382 vs 450 L/calf, P < 0.05), whereas for CCC calves milk-yield difference between dams for the control and suckling groups during the suckling period and over the full season was 706 and 1048 L/cow respectively. There was no difference in weaning weight of calves (87 ± 1.7 kg LW), but, owing to differences in pre-weaning growth rate, age to weaning was youngest (P < 0.05) for CCC (55 days), followed by ARH (62 days) and ARC (73 days). Respective growth rates between birth and weaning (P < 0.001) for CCC, ARH and ARC calves were 0.955, 0.873 and 0.755 ± 0.028 kg/day. Although there was a growth check among CCC calves during the weaning period, there were no post-weaning differences in growth rate among the groups.Conclusions: Increasing milk allowance had the benefit of improving calf pre-weaning growth rate, giving the option of weaning calves either earlier or when heavier. However, milk yield losses under suckling systems may be too high to warrant the elevated pre-weaning growth of calves.ImplicationsThe costs–benefits of high milk allocation or suckling systems need to be ascertained over the lifetime of the animals to assess long-term survival and productivity outcomes.
Temporal evolution of long-timescale periodicities in ULX NGC 5408 X-1
Creators: name: An, Tao
name: Lu, Xiang-Long
name: Wang, Jun-Yi
Publisher: name: arXiv
Year: 2015
Subjects: subject: High Energy Astrophysical Phenomena (astro-ph.HE)
subject: FOS: Physical sciences

description: Context. NGC 5408 X-1 is one of the few ultraluminous X-ray sources with an extensive monitoring program in X-rays (a temporal baseline of 4.2 yr), making it one of the most suitable candidates to study the long-timescale quasi-periodic oscillations (QPOs). Aims. Previous timing analysis of the Swift data of NGC 5408 X-1 led to detection of multiple periodicities ranging from 2.6 d to 230 d. In this paper, we focus on the statistical significance and the temporal evolution of these periodicities. Methods. A time-series analysis technique in the time-frequency domain, the weighted wavelet Z-transform (WWZ), was employed to identify the periodicities and trace their variations with time. Results. Three periodic components were detected from the WWZ periodogram, corresponding to periods of 2.65$\pm$0.01 d, 115.4$\pm$14.4 d and 189.1$\pm$15.2 d. All three have statistical significance higher than 99.74%. The 2.65-d periodicity is quite stable in the majority of the light curve. The 115-d periodicity is the most prominent but appears variable. The 189-d periodicity is persistent across the whole time coverage. It shows a steadily decreasing trend from the beginning (193 d period) to the end (181 d period). Conclusions. The long-timescale periodicities in NGC 5408 X-1 are most likely of super-orbital origin, and are probably associated with the precession of a warped accretion disc. The disc may have been broken into two distinct planes with different precessing periods, i.e. the 189-d and 115-d periodicities corresponding to the outer and inner disc, respectively.
description: 7 pages, 6 figures, accepted for publication in Astronomy and Astrophysics on 21/09/2015
Métricas alternativas para medir el impacto social de la investigación científica y tecnológica.
Creators: name: Ortiz-Núñez, Roelvis
name: Jaillier-Castrillón, Erika
Publisher: name: Zenodo
Year: 2023
Subjects: Altmetrics; Métricas alternativas; Impacto social de la investigación; Producción científica; Redes sociales y científicas.

description: La complejidad de la evaluación de los posibles impactos sociales de la investigación, dificulta la aplicación de metodologías integradoras, claras y aceptadas de forma universal. Si bien el campo de la evaluación del impacto científico ha sido estandarizado en la comunidad científica, las áreas sociales y humanas siguen adoleciendo de una madurez reconocida en el contexto de la evaluación de la investigación científica. En este sentido, el desarrollo e implementación de métricas alternativas contribuye a plantear un impacto más amplio de la investigación científica, al considerar como elemento novedoso y esencial, el impacto social que se puede captar a partir de la repercusión e influencia en redes sociales y científicas. Además, estas métricas favorecen el conocimiento de la dinámica social y tecnocientífica. La presente investigación puede ser considerada de tipo exploratorio y descriptivo, porque contribuirá a la aproximación al proceso de evaluación del impacto social de la investigación, mediante la exploración de aspectos como el impacto no académico, poco estudiado en la literatura. Como principales resultados se exponen y caracterizan las herramientas útiles para medir el impacto social de la investigación científica y tecnológica; así como los procedimientos a seguir para su exploración y análisis.
Cross-cultural differences in the development of essentialism (amendment for Covid-19 related procedure changes)
Creators: name: Moty, Kelsey
name: Wang, Michelle
name: Xu, Yian
name: Rhodes, Marjorie
Publisher: name: Open Science Framework
Year: 2022
Subjects: subject: Multicultural Psychology
subject: Developmental Psychology
subject: Social Psychology
subject: Cognitive Psychology
subject: Social and Behavioral Sciences
subject: Psychology
subject: FOS: Psychology

description: Update to procedures outlined in https://osf.io/3gbvp
Tartu Ülikooli muuseumi 2014. aasta aruanne
Creators: name: Raisma, Mariann
Publisher: name: Tartu Ülikooli ajaloo küsimusi
Year: 2015

description: Tartu Ülikooli ajaloo küsimusi, No 43 (2015): Ühiskonda muutvad teadused rahvusülikoolis
Bridgeland Stability on Threefolds -- Some Wall Crossings
Creators: name: Schmidt, Benjamin
Publisher: name: arXiv
Year: 2015
Subjects: subject: Algebraic Geometry (math.AG)
subject: FOS: Mathematics
subject: 14F05 (Primary), 14J30, 18E30 (Secondary)

description: Following up on the construction of Bridgeland stability condition on $\mathbb{P}^3$ by Macrì, we develop techniques to study concrete wall crossing behavior for the first time on a threefold. In some cases, such as complete intersections of two hypersurfaces of the same degree or twisted cubics, we show that there are two chambers in the stability manifold where the moduli space is given by a smooth projective irreducible variety, respectively the Hilbert scheme. In the case of twisted cubics, we compute all walls and moduli spaces on a path between those two chambers. This allows us to give a new proof of the global structure of the main component, originally due to Ellingsrud, Piene, and Strømme. In between slope stability and Bridgeland stability there is the notion of tilt stability that is defined similarly to Bridgeland stability on surfaces. Beyond just $\mathbb{P}^3$, we develop tools to use computations in tilt stability to compute wall crossings in Bridgeland stability.
description: 29 pages, 2 figures, comments welcome!
Morris-Thorne wormholes in static pseudo-spherically symmetric spacetimes
Creators: name: Cataldo, Mauricio
name: Liempi, Luis
name: Rodriguez, Pablo
Publisher: name: arXiv
Year: 2015
Subjects: subject: General Relativity and Quantum Cosmology (gr-qc)
subject: FOS: Physical sciences

description: In this paper we study classical general relativistic static wormhole configurations with pseudo-spherical symmetry. We show that in addition to the hyperbolic wormhole solutions discussed by Lobo and Mimoso in the Ref. Phys.\ Rev.\ D {\bf 82}, 044034 (2010), there exists another wormhole class, which is truly pseudo-spherical counterpart of spherical Morris-Thorne wormhole (contrary to the Lobo-Mimoso wormhole class), since all constraints originally defined by Morris and Thorne for spherically symmetric wormholes are satisfied. We show that, for both classes of hyperbolic wormholes the energy density, at the throat, is always negative, while the radial pressure is positive, contrary to the spherically symmetric Morris-Thorne wormhole. Specific hyperbolic wormholes are constructed and discussed by imposing different conditions for the radial and lateral pressures, or by considering restricted choices for the redshift and the shape functions. In particular, we show that an hyperbolic wormhole can not be sustained at the throat by phantom energy, and that there are pseudo-spherically symmetric wormholes supported by matter with isotropic pressure and characterized by space sections with an angle deficit (or excess).
description: 12 pages, 5 figures
Social Class Socialization in White, Non-Hispanic Families: The Role of Parents
Creators: name: Highlander, April
Publisher: name: The University of North Carolina at Chapel Hill University Libraries
Year: 2019

description: Subjective social class, or one’s perception of their position in socioeconomic hierarchies, is theorized to be an identity present in children as young as twelve years old; however, little is known about younger children’s exposure to social class messages or parents’ role in the socialization of subjective social class during this critical developmental period.  As a formative step, this study includes the development and preliminary testing of a social class socialization scale which was administered to White, non-Hispanic parents (N = 227) of young (3 – 7 years old) children. Findings suggest that parents of children in this age range convey class socialization messages, and those messages may vary based on experiences of discrimination and income. Clinical implications and directions for future research are discussed.
Msc Thesis submitted to College of Business and Economics of Addis Ababa University in partial fulfillment of the requirement for award of the degree of Master Science in Accounting and Finance Program
Creators: name: Dawit Belete
Publisher: name: Zenodo
Year: 2017

description: Both internal and external determinants of Bank profitability affect the profitability of Private Commercial Banks in Ethiopia. This study identifies bank specific, industry specific and macroeconomic factors that determine the profitability of Ethiopian private commercial banks. Six private commercial banks have been the subject for the study ranging from 2004/2005 to 2014/2015. The bank's Audited financial statement, National Bank of Ethiopia and Ministry of finance and Economic Cooperation has been the main source for the study and the panel analysis has been carried out to obtain the result for this empirical study. The study used ROA as a Dependent variable and capital adequacy, operational efficiency, liquidity, income diversification, concentration, GDP, inflation and money supply as independent variables. The empirical results showed that capital, operational efficiency, income diversification, concentration and money supply have significant relationship with profitability of Ethiopian private commercial banks. However the result shows insignificant relationship between profitability of Ethiopian private commercial banks with liquidity, GDP and inflation.