cometadata/datacite-rtg-text-other-reclassification-records huggingface dataset:
Patterns of galaxy spin directions in SDSS and Pan-STARRS show parity violation and multipoles
Creators: name: Shamir, Lior
Publisher: name: arXiv
Year: 2020
Subjects: subject: Cosmology and Nongalactic Astrophysics (astro-ph.CO)
subject: Astrophysics of Galaxies (astro-ph.GA)
subject: FOS: Physical sciences

description: The distribution of spin directions of $\sim6.4\cdot10^4$ SDSS spiral galaxies with spectra was examined, and compared to the distribution of $\sim3.3\cdot10^4$ Pan-STARRS galaxies. The analysis shows a statistically significant asymmetry between the number of SDSS galaxies with opposite spin directions, and the magnitude and direction of the asymmetry changes with the direction of observation and with the redshift. The redshift dependence shows that the distribution of the spin direction of SDSS galaxies becomes more asymmetric as the redshift gets higher. Fitting the distribution of the galaxy spin directions to a quadrupole alignment provides fitness with statistical significance >5$σ$, which grows to >8$σ$ when just galaxies with z>0.15 are used. Similar analysis with Pan-STARRS galaxies provides dipole and quadrupole alignments nearly identical to the analysis of SDSS galaxies, showing that the source of the asymmetry is not necessarily a certain unknown flaw in a specific telescope system. While these observations are clearly provocative, there is no known error that could exhibit itself in such form. The data analysis process is fully automatic, and uses deterministic and symmetric algorithms with defined rules. It does not involve either manual analysis that can lead to human perceptual bias, or machine learning that can capture human biases or other subtle differences that are difficult to identify due to the complex nature of machine learning processes. Also, an error in the galaxy annotation process is expected to show consistent bias in all parts of the sky, rather than change with the direction of observation to form a clear and definable pattern.
description: ApSS, accepted. arXiv admin note: substantial text overlap with arXiv:1912.05429
Socioeconomic structures & their impact on development in Nigeria
Creators: name: Ogoko, Gerald
Publisher: name: figshare
Year: 2020
Subjects: subject: Economics
subject: 149999 Economics not elsewhere classified
subject: FOS: Economics and business
subject: 140203 Economic History
subject: 140199 Economic Theory not elsewhere classified

description: This paper examines typical socioeconomic structures in Nigeria and how they impact development outcomes in the country
An electro-mechanically coupled computational multiscale formulation for electrical conductors
Creators: name: Kaiser, Tobias
name: Menzel, Andreas
Publisher: name: Technische Universität Dortmund
Year: 2020
Subjects: subject: Flexible electronic devices
subject: Electro-mechanical coupling
subject: Conductors
subject: Anisotropic conductivity
subject: Heterogeneous microstructures
subject: Multiscale modelling
subject: Scale-bridging
subject: 620
subject: 670
subject: Transportables Gerät
subject: Elektrischer Leiter
subject: Mikrostruktur
subject: Mathematische Modellierung
subject: Mehrskalenanalyse
subject: Werkstoffprüfung
subject: Finite-Elemente-Methode

description: Motivated by experimental findings on deformation induced microcracks in thin metal films and by their influence on the effective macroscopic electrical conductivity, a computational multiscale formulation for electrical conductors is proposed in this contribution. In particular, averaging theorems for kinematic quantities and for their energetic duals are discussed, an extended version of the Hill–Mandel energy equivalence condition is proposed and suitable boundary conditions for the microscale problem are elaborated. The implementation of the proposed framework in a two-scale finite element environment is shown and representative boundary value problems are studied in two- and three-dimensional settings.
Online and Adaptive Methods for Multitask Learning
Creators: name: Murugesan, Keerthiram
Publisher: name: Carnegie Mellon University
Year: 2024
Subjects: Computational Logic and Formal Languages

description:  The power of joint learning in multiple tasks arises from the transfer of relevant knowledge across said tasks, especially from information-rich tasks to information?poor ones. Lifelong learning, on the other hand, provides an efficient way to learn new tasks faster by utilizing the knowledge learned from the previous tasks and prevent catastrophic forgetting or significantly degrading performance on the old tasks. Despite several advantages on learning from related tasks, it poses considerable challenges in terms of effectiveness by minimizing prediction errors for all tasks and overall computational tractability for real-time performance, especially when the number of tasks is large. In contrast, human beings seem natural in accumulating and retaining the knowledge from the past and leverage this knowledge to acquire new skills and solve new problems efficiently. We consider two key challenges in multitask and lifelong learning: 

  Sequential data: In many real-world applications such as optimizing financial trading, email prioritization, personalized news, and spam filtering, etc., data arrive sequentially. In such cases, we need to make predictions and update the per-task models in an efficient real-time manner when a new observation or task is available. 
 Scalability: Most existing algorithms for multitask learning cannot scale to very large dataset especially when the number of tasks is large. The computational complexity arises due to the difficulty in learning the shared knowledge from all the tasks. 

Together, these two challenges may hinder the practical application of multitask learning to several real-world problems. In this thesis, we propose simple and efficient algorithms for learning from related tasks to address the aforementioned challenges. We present algorithms that feature probabilistic interpretation, efficient updating rules and flexible modulation on whether learners focus on their specific task or on jointly address all tasks. We develop a novel approach to active learning for sequential problems that first determines if the learner can acquire a label from its peers. If so, it saves the query for later use in more difficult cases, and if not it queries the human. We define a new machine learning paradigm based on a curriculum defined dynamically by the learner ("self-paced") instead of a fixed curriculum set a-priori by a teacher. The primary focus of this thesis is to scale the multitask and lifelong learning to practical applications where both the tasks and/or the examples of the tasks arrive in an online fashion.
The Developmental Relevance of Tariff Rate Quotas as a Market Access Instrument: An Analysis of Swiss Agricultural Imports
Creators: name: Khorana, Sangeeta
name: Khorana, Sangeeta
Publisher: name: Unknown
Year: 2008
Subjects: subject: Agribusiness
subject: Agricultural Finance
subject: International Development
subject: International Relations/Trade
subject: developing countries
subject: Switzerland
subject: tariff rate quotas

description: At present there are 1425 tariff rate quotas (TRQs) notified by member countries to the World Trade Organization. TRQs were provided for in the Uruguay Round as a trade policy instrument to guarantee minimum market access for politically sensitive agricultural imports, and in some cases to continue managed trade regimes. This article evaluates the developmental relevance of TRQs and discusses how the various methods TRQ administration methods influence market access in Switzerland for agricultural products from developing countries. The findings show that existing TRQ management in Switzerland is complicated and lacks transparency. Further, the manner in which TRQs are administered results in high transaction costs, a situation that fails to liberate trade opportunities from rents and influences trade flows of the partner countries. Proposed reforms are establishment of a more efficient administrative mechanism, modalities to liberalize trade with TRQs through reduction of out-of-quota tariffs, and capacity building in developing countries; such reforms would maximize market access opportunities from a development perspective.
Ausgewählte Bibliograhpie über den christlichen Orient aus den libanesischen Druckereien (1962-1972)
Publisher: name: Oriens christianus : Hefte für die Kunde des christlichen Orients
Year: 2024

description: Oriens christianus : Hefte für die Kunde des christlichen Orients, Bd. 57 (1973): Oriens christianus, Band 57
Fertilizer use on Smallholder Farm in Eastern Province, Zambia
Creators: name: Dayanatha, Jha
name: Behjat, Hojjati
name: Dayanatha, Jha
name: Behjat, Hojjati
Publisher: name: Unknown
Year: 1993
Subjects: subject: Crop Production/Industries
subject: Fertilizers
subject: Zambia
subject: Eastern province
subject: Small Farms

description: IN Sub-Sahara Africa, Which so far has benefited little from the green revolution. the adoption of high-yielding maize had great potential for closing the gap between food demand and supply. To bring about this transformation, fertilizer is essential for realizing the yield potential of hybrid maize while sustaining the fertility of Africa's fragile land. This study of Eastern Province, Zambia, shows that use of fertilizer on traditional varieties can also be a catalyst for agricultural growth. This work is part of an extensive body of research on adoption of new agricultural technology carried out by IFPRi in Asia and Africa. The study was undertaken in collaboration with several Zambia institutions, including the Rural Development Studies Bureau(University of Zambia), the National Food and Nutrition Commission, and the Eastern Province Agricultural Development Project( both of the government of the Republic Of Zambia.) It was founded by the Swiss Development Cooperation. The relationship between technological change and government policy has always been an important part of IFPRI's research program. IFPRI's ongoing research on fertilizer use is part of an effort to devise workable policies for translating new technology into rapid agricultural growth and sustainable development that benefit all segments of society, but particularly the poor. it also relates to other IFPRI research on input market reforms, which examines ways to improve access of the poor to inputs such as fertilizer through efficient pricing and distribution policies.
Towards the Development of a National Cybersecurity Strategy in Nigeria
Creators: name: Ogoko, Gerald
Publisher: name: figshare
Year: 2020
Subjects: subject: 80609 Information Systems Management
subject: FOS: Computer and information sciences
subject: Information Systems
subject: 80303 Computer System Security

description: This documents assesses the digital landscape in Nigeria and highlights pointers for the development of a national cybersecurity strategy for Nigeria
Development in Nigeria (1).pdf
Creators: name: Ogoko, Gerald
Publisher: name: figshare
Year: 2020
Subjects: subject: 149901 Comparative Economic Systems
subject: FOS: Economics and business
subject: Economics

description: This book is provides a comprehensive examination of development in Nigeria including tracking performance from the MDGs to the SDGs. It also includes a peer assessment of development in Nigeria relative to other African countries.
Effect of bleaching agent on interfacial fracture toughness of resin composite-dentin interfaces
Creators: name: Far, Cyrus
Publisher: name: University of British Columbia
Year: 2009

description: The effect of bleaching on fracture toughness (KIC) of existing composite-dentin interfaces was assessed using the notchless triangular prism (NTP) specimen fracture toughness test. Human molars and premolars (<6 months old) were wet ground on 600 SiC to obtain 4x4x4x4mm triangular prisms with buccal or lingual exposed for bonding. Buccal or lingual dentin surfaces, ground on 600 grit sandpaper immediately before bonding, were bonded using a resin composite (Z- 250, 3M) and a dentin bonding agent (Single Bond, 3M) to obtain 4x4x4x8mm dentin-composite NTP specimens. Samples were randomly divided into 18 groups (n=9) and exposed to four concentrations of bleaching agent (11,13,16, and 21% carbamide peroxide). Controls were exposed to the same conditions as experimental groups, but were treated with tap water instead of carbamide peroxide. Exposure to the bleaching agent took place in 30-minute increments for 2 hours per day during the first week and 4 hours per day in the following two weeks. Samples were stored in tap water for 1 hour in between treatments, and 7 hours overnight. Testing was conducted after a cumulative exposure of 14, 42, and 70 hours. The maximum force required to fracture specimens, using an Instron 4311 universal testing machine at a cross head speed of 0.1 mm/min, was recorded and used to calculate KIC in order to investigate the effect of concentration and length of exposure to the bleaching agent on interfacial fracture toughness. Results were analyzed using two-factor ANOVA and Bonferroni multiple means comparisons. Increasing length of exposure to the bleaching agent resulted in a significant decrease in fracture toughness (p<.01). No statistical differences in bleaching agent concentration were detected (p=0.78). SEM observations of fractured surfaces revealed differences in fracture path of control and experimental groups.
The Paucity Factor: Race Equality Provision In Initial Teacher Education
Creators: name: McClue, Heather
Publisher: name: University of Leicester
Year: 2020
Subjects: Uncategorized

description: Using the critical race theory paradigm, this study adopts a deductive-inductive case-study approach which utilises semi-structured interviews and document analysis. The original contribution to knowledge it makes arises from the consideration of the presence of race equality provision across four initial teacher education (ITE) pathways. The study reports the perceptions of ITE tutors’ and student teachers’ experience in relation to programme content, ITE pedagogy and the student teachers’ own means of developing their preparedness for teaching in a diverse educational context. The findings suggest that the existence of a performative culture within ITE has resulted in a generation of new entrants to the profession who are better placed to cope with the rigours of assessing, planning, behaviour for learning and aspects of inclusion than they are able to effectively manage race equality in the classroom. The ITE tutors and student teachers alike are pre-occupied by the need for compliance with the Teacher Standards (2012), whilst issues of race equality within ITE are compromised by the current demands of the neoliberal agenda and colour blindness. Further to this, the study utilises a triadic typology to argue that a student teacher’s propensity to engage with issues of race equality provision in the classroom is largely dependent on their pre-service experience. The research recommends the need for ITE providers to investigate their own perpetration of 'normative' culture through the constructs of White privilege in the preparation of new entrant teachers for 21st century practice.
Desorption of zinc, copper and lead ions from loaded flax fibers
Creators: name: Kajeiou, Meriem
name: Alem, Abdellah
name: Mezghich, Soumaya
name: Ahfir, Nasre-Dine
name: Mignot, Mélanie
name: Pantet, Anne
Publisher: name: Taylor & Francis
Year: 2021
Subjects: subject: Biophysics
subject: Space Science
subject: 29999 Physical Sciences not elsewhere classified
subject: FOS: Physical sciences
subject: 59999 Environmental Sciences not elsewhere classified
subject: FOS: Earth and related environmental sciences
subject: 39999 Chemical Sciences not elsewhere classified
subject: FOS: Chemical sciences
subject: 20199 Astronomical and Space Sciences not elsewhere classified
subject: 69999 Biological Sciences not elsewhere classified
subject: FOS: Biological sciences
subject: 60506 Virology

description: Biosorption is an efficient and cost effective method for heavy metals remediation. However, saturated biosorbents may present a serious problem for the environment. Flax fibers have previously shown very good adsorption capacities to remove zinc, copper and lead ions from contaminated aqueous solutions. In this study, adsorption-desorption cycles were conducted with loaded flax fibers in batch mode in order to recover heavy metals using four types of solutions: hydrochloric acid solution, nitric acid solution, sodium hydroxide solution and ultra-pure water. Desorption kinetic studies, conducted with loaded flax fibers showed a very fast desorption of zinc, copper and lead when using nitric and hydrochloric acids with a selectivity sequence of Zn (totally desorbed) > Cu (94%) > Pb (80% - 73%). Desorption kinetic was slower with the use of sodium hydroxide and showed much lower desorption rates of Zn (62%) > Pb (12%) > Cu (7%). Desorption of zinc and copper from previously loaded fibers from binary metal ion system in lead solution was also investigated. Different concentrations ranging from 0.04 to 0.20 mmol/L were tested. The obtained results demonstrated a significant release in the order Zn (18-90%) > Cu (2-42%) while lead was still efficiently adsorbed. Retention efficiencies of zinc and copper and adsorption efficiency of lead resulted in the same adsorption efficiencies of the three metal ions onto flax fibers in the ternary metal ion system.
13_4_13.pdf
Creators: name: Zaid, Malik Muhammad
name: Malik, Muhammad Usama
name: Bhatti, Muhammad Sibtain
name: Razzaq, Hamid
name: Aslam, Muhammad Umair
Publisher: name: figshare
Year: 2020
Subjects: subject: 90699 Electrical and Electronic Engineering not elsewhere classified
subject: FOS: Electrical engineering, electronic engineering, information engineering

description: In this project, PQ analyzer is developed which depicts the detection and classification of short and long duration disturbances in power system. These disturbances comprising of sag, swell, interruption, undervoltage, and overvoltage. All these disturbances are analyzed by uninterruptedly monitoring of power system. This paper outlines the start time, end time, magnitude and waveform of disturbances. These detected disturbances are classified on the basis of their respective characteristics. The perceptions and classifications are accomplished by using Advanced Digital Signal Processor (ADSP-21369). The statistics of disturbance are stored precisely and accurately. The prototype is configured with the LabVIEW to receive and store all the data which is sent by the processor via UART interface (RS-232 protocol).
title: Вязко-невязкое взаимодействие в трехмерных течениях с подковообразными вихревыми структурами: численное моделирование
title: специальность 01.02.05 "Механика жидкости, газа и плазмы"
titleType: Subtitle
Creators: name: Колесник, Елизавета
Publisher: name: Санкт-Петербургский политехнический университет Петра Великого
Year: 2021
Subjects: Струи сверхзвуковые
Ламинарное течение
Турбулентное течение
Жидкости вязкие
Вычислительные машины электронные персональные

description: Изложены основные возможности развиваемого в СПбПУ неструктурированного конечно-объемного гидродинамического кода SINF/Flag S, существенно расширенного автором посредством разработки комплекса программных модулей, в которых реализованы современные численные методики расчета сжимаемых течений, включая различные способы повышения порядка точности при работе с неструктурированными сетками. Приводятся результаты систематического тестирования многочисленных вариантов схем повышенного порядка точности.Представляются результаты численного исследования вязко-невязкого взаимодействия в трехмерных ламинарных и турбулентных течениях с подковообразными вихревыми структурами, возникающих при обтекании потоком вязкого газа установленных на пластине одиночных препятствий в виде цилиндрического тела с затупленной передней кромкой.
The Food, Conservation, and Energy Act of 2008: Preliminary Analysis of Selected Provisions
Creators: name: Westhoff, Patrick C.
name: Brown, Scott
name: Westhoff, Patrick C.
name: Brown, Scott
Publisher: name: Unknown
Year: 2008
Subjects: Agricultural and Food Policy
Resource /Energy Economics and Policy

description: This report provides preliminary analysis of impacts of selected Food, Conservation and Energy Act of 2008 (FCEA) provisions.
Light Dark Matter
Creators: name: Casse, Michel
name: Fayet, Pierre
Publisher: name: arXiv
Year: 2005
Subjects: subject: Astrophysics (astro-ph)
subject: FOS: Physical sciences

description: The SPI spectrometer aboard of the INTEGRAL satellite has released a map of the e+e- annihilation emission line of unprecedented quality, showing that most of the photons arise from a region coinciding with the stellar bulge of the Milky Way. The impressive intensity (10^-3 photon/cm^2/s) and morphology (round and wide) of the emission is begging an explanation. Different classes of astrophysical objects could inject positrons in the interstellar medium of the bulge, but the only acceptable ones should inject them at energies low enough to avoid excessive bremsstrahlung emission in the soft gamma ray regime. Among the ~ MeV injectors, none seems generous enough to sustain the high level of annihilation observed. Even the most profuse candidate, namely the beta+ radioactivity of 56 Co nuclei created and expelled in the interstellar medium by explosive nucleosynthesis of type Ia supernovae, falls short explaining the phenomenon due to the small fraction of positrons leaking out from the ejecta (3 %), together with the low SNIa rate in the bulge (0.03 per century). It is therefore worth exploring alternative solutions, as for instance, the idea that the source of the positrons is the annihilation of light dark matter (LDM) particles of the kind recently proposed, totally independently, by Boehm and Fayet. Assuming that LDM is the culprit, crucial constraints on the characteristics (mass and annihilation cross-section) of the associated particle may be discussed, combining direct gamma ray observations and models of the early Universe. In particular, the mass of the LDM particles should be significantly less than 100 MeV, so that the e+ and e- resulting from their annihilations do not radiate exceedingly through bremsstrahlung in the interstellar gas of the galactic bulge.
description: 8 pages, to appear in Proc. 21st IAP Colloquium "Mass Profiles and Shapes of Cosmological Structures", Paris 4-9 July 2005 (EAS Publications Series, G. Mamon, F. Combes, C. Deffayet, B. Fort eds.)
title: Методология создания и практическая реализация микротурбинных установок
title: специальность 05.04.12 "Турбомашины и комбинированные турбоустановки"
titleType: Subtitle
Creators: name: Беседин, Сергей
Publisher: name: Санкт-Петербургский политехнический университет Петра Великого
Year: 2021
Subjects: Турбинные установки

description: Работа посвящена вопросам теории и конструирования микротурбинных установок. Приводится описание и анализ существующих типов установок, разработаны принципы их системной классификации, проведен анализ тепловых схем,построены математические модели структурных элементов, разработана методика создания микротурбинных установок. Приведены примеры созданных на основе разработанной методики практических микротурбинных установок.
Mateos, Juan: La célébration de la parole dans la liturgie byzantine
Creators: name: Winkler, Gabriele
Publisher: name: Oriens christianus : Hefte für die Kunde des christlichen Orients
Year: 2024

description: Oriens christianus : Hefte für die Kunde des christlichen Orients, Bd. 57 (1973): Oriens christianus, Band 57
A photochemical model of ultraviolet atomic line emissions in the inner coma of comet 67P/Churyumov-Gerasimenko
Creators: name: Raghuram, Susarla
name: Bhardwaj, Anil
Publisher: name: arXiv
Year: 2020
Subjects: subject: Earth and Planetary Astrophysics (astro-ph.EP)
subject: FOS: Physical sciences

description: Alice ultraviolet spectrometer onboard Rosetta space mission observed several spectroscopic emissions emanated from volatile species of comet 67P/Churyumov-Gerasimenko (hear after 67P/C-G) during its entire escorting phase. We have developed a photochemical model for comet 67P/C-G to study the atomic hydrogen (HI 1216, 1025, & 973 Ang), oxygen (OI 1152, 1304, & 1356 Ang), and carbon (CI 1561 & 1657 Ang) line emissions by accounting for major production pathways. The developed model has been used to calculate the emission intensities of these lines as a function of nucleocentric projected distance and also along with the nadir view by varying the input parameters, viz., neutral abundances and cross sections. We have quantified the percentage contributions of photon and electron impact dissociative excitation processes to the total intensity of the emission lines, which has important relevance for the analysis of Alice observed spectra. It is found that in comet 67P/C-G, which is having a neutral gas production rate of about 10$^{27}$ s$^{-1}$ when it was at 1.56 AU from the Sun, photodissociative excitation processes are more significant compared to electron impact reactions in determining the atomic emission intensities. Based on our model calculations, we suggest that the observed atomic hydrogen, oxygen, and carbon emission intensities can be used to derive H$_2$O, O$_2$, and CO, abundances, respectively, rather than electron density in the coma of 67P/C-G, when the comet has a gas production rate of $\ge$ 10$^{27}$ s$^{-1}$.
description: 15 pages, 10 figures
Model of the US Ethanol Market
Creators: name: Thompson, Wyatt
name: Meyer, Seth D.
name: Westhoff, Patrick C.
name: Thompson, Wyatt
name: Meyer, Seth D.
name: Westhoff, Patrick C.
Publisher: name: Unknown
Year: 2008
Subjects: Agricultural and Food Policy
Resource /Energy Economics and Policy

description: This report estimates the effects of public policy options and external conditions on ethanol and agricultural commodity markets, farm income and government costs.
Impacts of Selected Title I Provisions of the Senate Committee Farm Bill
Creators: name: Westhoff, Patrick C.
name: Westhoff, Patrick C.
Publisher: name: Unknown
Year: 2007
Subjects: Agricultural and Food Policy
Food Security and Poverty
Resource /Energy Economics and Policy

description: This report examines selected provisions of Title I of the “Food and Energy Security Act of 2007,” as approved by the Senate Committee on Agriculture, Nutrition and Forestry.
Famine in Ethiopia: Policy Implications of Coping Failure at National and Household Levels
Creators: name: Webb, Patrick
name: Von Braun, Joachim
name: Yohannes, Yisehac
name: Webb, Patrick
name: Von Braun, Joachim
name: Yohannes, Yisehac
Publisher: name: Unknown
Year: 1992
Subjects: subject: Agricultural and Food Policy
subject: Famines
subject: Ethiopia
subject: Droughts
subject: Government policy
subject: Food supply

description: This study argues that famines are preventable. What was once a universal threat to human life is now primarily in Sub-Saharan Africa. Africa is likely to be the only continent to experience a continued high level of famine mortality during the 1990s, as well as an increase in absolute poverty. Therefore, the current challenge facing policymakers and research organizations such as IFPRI is to reduce the negative effects of famine in Africa and to lay the foundations for its longer- term eradication. This research by Patrick Webb, Joachim von Braum, and Yisehac Yohannes was designed to contribute to a better understanding of the root causes of famine and thereby to identify appropriate policies and projects for famine mitigation. As part of a larger IFPRI research effort on famine, this study complements a parallel study conducted on famine in Sudan that was presented in Research Report 88. Untill recently, the design of improved famine interventions has been hampered by a lack of detailed knowledge about who suffers most and why, and what can be done about it. Answers to these questions were sought by the authors through detailed field surveys in seven famine-affected areas of Ethiopia. An analysis of the roles of drought and market failure in famine was also pursued based on secondary data. The research findings demonstrate that drought and war are important, but only partial contributors to famine. The underlying factor that makes famine possible is poverty- absolute poverty at both the national and household levels. Thus, a policy focus on removing poverty becomes a key element of any famine prevention strategy. The creation of a macroeconomic environment favorable to private enterprise contributes to such a strategy. But public action will also continue to have an important role to play in famine mitigation between IFPRI and Ethiopia's policymakers is focused on identifying and aiding the implementation of such policies and programs.
title: Точность зубчатых передач
title: специальность 05.02.18 "Теория механизмов и машин"
titleType: Subtitle
Creators: name: Данг Нян Тхонг
Publisher: name: Санкт-Петербургский политехнический университет Петра Великого
Year: 2021
Subjects: Зубчатые передачи

description: Диссертация посвящена анализу системы нормирования точности зубчатых механизмов и методов их применения, также разработке методов для повышения точности зубчатых передач.Предложена методика уменьшения кинематической погрешности передачи при сборке. Проанализированы приближенные зацепления с учетом влияния упругих деформаций. Сопоставлены различные подходы к расчету бокового зазора, оценено влияние дополнительного смещения исходного контура на качество передач. Результаты подобных исследований могут быть использованы в практике при дальнейшем изучении проблем усовершенствования системы нормативных документов, при подготовке специалистов по теории машин и механизмов. Материалы диссертации могут быть полезны инженерам и конструкторам, которые в своих работах затрагивают проблемы точности зубчатых механизмов.
The Simplest Piston Problem II: Inelastic Collisions
Creators: name: Hurtado, P. I.
name: Redner, S.
Publisher: name: arXiv
Year: 2005
Subjects: subject: Statistical Mechanics (cond-mat.stat-mech)
subject: FOS: Physical sciences

description: We study the dynamics of three particles in a finite interval, in which two light particles are separated by a heavy ``piston'', with elastic collisions between particles but inelastic collisions between the light particles and the interval ends. A symmetry breaking occurs in which the piston migrates near one end of the interval and performs small-amplitude periodic oscillations on a logarithmic time scale. The properties of this dissipative limit cycle can be understood simply in terms of an effective restitution coefficient picture. Many dynamical features of the three-particle system closely resemble those of the many-body inelastic piston problem.
description: 8 pages, 7 figures, 2-column revtex4 format
POLICIES FOR AGRICULTURE IN POLAND AND THE NETHERLANDS; CONTRIBUTIONS TO A POLICY DIALOGUE
Creators: name: Van Berkum, Siemen
name: De Bont, Kees
name: Van Berkum, Siemen
name: De Bont, Kees
Publisher: name: Unknown
Year: 2003
Subjects: Agricultural and Food Policy

description: This volume contains background papers that contributed to discussions between Polish and Dutch agricultural policy makers, held in Warsaw (16-17 July, 2002) and in The Hague (26-27 September, 2002). These meetings took place in the context of the Utrecht Conference in which bilateral meetings on various policy issues are organised. The papers give insights in the agricultural and rural development in both countries and point at the main problems at stake. Further, the contributions discuss the past and present agricultural and rural policies and show to what extent these policies help(ed) to tackle the major problems of the agricultural sector and rural areas. Discussions took place on various issues such as farm retirement and direct payment schemes, competitiveness of the sector and the future developments of the Common Agricultural Policy in an enlarged European Union.
Archaeological site record for CA-SBA-1909
Creators: name: Nocerino, Eric
Year: 2017
Subjects: subject: CA-SBA-1909
valueUri: https://core.tdar.org/browse/site-name/138627/ca-sba-1909
subject: Reconnaissance / Survey
valueUri: https://core.tdar.org/browse/investigation-type/7/reconnaissance-survey

description: This document is the archaeological site record for CA-SBA-1909 located on Vandenberg Space Force Base. The record consists of two recordation events in 1985 and 2017.
Supplementary document for Experiment and theory of the complex refractive index of dense colloidal media - 6777130.pdf
Creators: name: Speets, Peter
name: Kalkman, Jeroen
Publisher: name: Optica Publishing Group
Year: 2024
Subjects: Uncategorized

description: Contains the QCA-CP and Keller models. It also contains the raw fit parameters of the best model.
Nest-site availability, selection and reuse in a cavity-nesting community in forests of interior British Columbia
Creators: name: Aitken, Kathryn Elizabeth Helen
Publisher: name: University of British Columbia
Year: 2009

description: Cavity nesting communities are structured in a complex hierarchy of interdependencies based on the creation of and competition for nest-sites. This structure has been called a nest web. Although cavities are persistent and may be used multiple times, few studies have examined cavity use in relation to availability, or patterns of nest-site reuse. My objectives were to: 1) determine cavity availability and use in continuous and naturally-fragmented forests, and 2) examine nest-site reuse by cavity nesting guilds and species. To examine cavity availability and use, I measured nest-site characteristics in continuous forests and naturally-fragmented aspen (Populus tremuloides) stands in British Columbia. I examined cavity selection at the community, guild and species levels using resource selection indices. Continuous forests had fewer cavities and lower cavity occupancy rates (9-10%) than fragments (35-44%). However, cavity characteristics did not differ between those habitats. Overall, cavity nesters preferred live, unhealthy trees with few holes. Nest-site selection was influenced by tree and habitat attributes, rather than cavity characteristics such as orientation. Low overall occupancy rates suggested that there was a surplus of cavities. To examine nest-site reuse, 193 cavities were monitored between 1995-1999. Eight percent of cavities were destroyed during the study, mainly due to tree blowdown. Cavities were occupied two years in a row, rather than intermittently. Reuse rates were highest for cavities occupied by secondary cavity nesters (48%) and were lowest for those used by weak excavators (17%). Although woodpeckers were the main providers of cavities for secondary cavity nesters in the community, only 28% of cavities used by woodpeckers were occupied the following year. Reuse rates varied considerably among species within all guilds. Deep cavities with large entrances and those in aspen were reused most often, as were those in aspen groves and close to forest edges. I suggest that large-scale attributes such as proximity to foraging habitat are better indicators of nest-site suitability than microhabitat characteristics. Thus cavity-nesting communities should be managed at a larger scale than individual nest trees or cavities. Because cavity abundance does not reflect cavity suitability, counts of holes will not predict the ability of a habitat to sustain cavity-nester populations.
On the Equivalence of Spacetimes, the Cartan-Karlhede Algorithm
Creators: name: Mergulhão, Thiago M.
name: Batista, Carlos
Publisher: name: arXiv
Year: 2020
Subjects: subject: General Relativity and Quantum Cosmology (gr-qc)
subject: Mathematical Physics (math-ph)
subject: Differential Geometry (math.DG)
subject: FOS: Physical sciences
subject: FOS: Mathematics

description: It is well known that in general relativity theory two spacetimes whose metrics are related by a coordinate transformation are physically equivalent. However, given two line elements, it is virtually impossible to implement the most general coordinate transformation in order to check the equivalence of the spacetimes. In this paper we present the so-called Cartan-Karlhede algorithm, which provides a finite sequence of steps to decide whether or not two metrics are equivalent. The point of this note is to illustrate the method through several simple examples, so that the reader can learn the fundamentals and details of the algorithm in practice.
description: Didactic paper, intended to beginners on the field. 13 pages
Angular Dependence of Exchange Anisotropy on Cooling Field in FM/Fluoride Thin Films
Creators: name: Olamit, Justin
name: Li, Zhi-Pan
name: Schuller, Ivan K.
name: Liu, Kai
Publisher: name: arXiv
Year: 2005
Subjects: subject: Materials Science (cond-mat.mtrl-sci)
subject: FOS: Physical sciences

description: Exchange anisotropy in ferromagnet/antiferromagnet (FM/AF) films is usually introduced along the cooling field or FM magnetization direction. Here we investigate the dependence of the exchange anisotropy, loop bifurcation, and reversal mechanism on the cooling field direction using vector magnetometry. Three types of samples (FM=Fe, Ni /AF = FeF2, MnF2) have been studied where the AF layer is epitaxial (110), twinned (110), and polycrystalline. With an epitaxial AF which has one spin axis, the cooling field orients the exchange field along the spin axis. Applying the cooling field perpendicular to the spin axis results in bifurcated loops, whose shape evolves with the cooling field geometry and strength. With a twinned AF where there are two orthogonal spin axes, the exchange field direction is along the bisector of the spin axes that encompass the cooling field. With a polycrystalline AF, the exchange field direction is the same as the cooling field. Transverse hysteresis loops show that when the exchange field has a component perpendicular to the applied field, the magnetization reversal occurs by rotation in the direction of the perpendicular component. Our results demonstrate that in fluoride films, the exchange field is established primarily by the AF anisotropy direction, and only to a lesser extent the cooling field or the magnetization direction. The bifurcated loops are due to a distribution of AF anisotropies and large AF domain sizes. Furthermore, the magnetization reversal process is extremely sensitive to the exchange field direction.
description: 28 pages, 1 table, 7 figures, to appear in PRB
Activity Detection from Wearable Electromyogram Sensors using Hidden Markov Model
Creators: name: Gupta, Rinki
name: Suri, Karush
Publisher: name: arXiv
Year: 2020
Subjects: subject: Signal Processing (eess.SP)
subject: Machine Learning (cs.LG)
subject: Machine Learning (stat.ML)
subject: FOS: Electrical engineering, electronic engineering, information engineering
subject: FOS: Computer and information sciences

description: Surface electromyography (sEMG) has gained significant importance during recent advancements in consumer electronics for healthcare systems, gesture analysis and recognition and sign language communication. For such a system, it is imperative to determine the regions of activity in a continuously recorded sEMG signal. The proposed work provides a novel activity detection approach based on Hidden Markov Models (HMM) using sEMG signals recorded when various hand gestures are performed. Detection procedure is designed based on a probabilistic outlook by making use of mathematical models. The requirement of a threshold for activity detection is obviated making it subject and activity independent. Correctness of the predicted outputs is asserted by classifying the signal segments around the detected transition regions as activity or rest. Classified outputs are compared with the transition regions in a stimulus given to the subject to perform the activity. The activity onsets are detected with an average of 96.25% accuracy whereas the activity termination regions with an average of 87.5% accuracy with the considered set of six activities and four subjects.
The Rich Lack Close Neighbours: The Dependence of Blue-Straggler Fraction on Metallicity
Creators: name: Wyse, Rosemary F. G.
name: Moe, Maxwell
name: Kratter, Kaitlin M.
Publisher: name: arXiv
Year: 2020
Subjects: subject: Astrophysics of Galaxies (astro-ph.GA)
subject: Solar and Stellar Astrophysics (astro-ph.SR)
subject: FOS: Physical sciences

description: Blue straggler stars (BSS) have been identified in star clusters and in field populations in our own Milky Way galaxy and in its satellite galaxies. They manifest as stars bluer and more luminous than the dominant old population, and usually have a spatial distribution that follows the old population. Their progenitors are likely to have been close binaries. We investigate trends of the BSS population in dwarf spheroidal galaxies (dSph) and in the bulge of the Milky Way and find an anti-correlation between the relative frequency of BSS and the metallicity of the parent population. The rate of occurrence of BSS in the metal-poor dwarf galaxies is approximately twice that found in the solar-metallicity bulge population. This trend of decreasing relative population of BSS with increasing metallicity mirrors that found for the close-binary fraction in the field population of the Milky Way. We argue that the dominant mode of BSS formation in low-density environments is likely to be mass transfer in close-binary systems. It then follows that the similarity between the trends for BSS in the dSph and field stars in our Galaxy supports the proposal that the small-scale fragmentation during star formation is driven by the same dominant physical process, despite the diversity in environments, plausibly gravitational instability of proto-stellar discs.
description: 11 pages, 3 figures, MNRAS in press (March 2020
HORTUS; Modelling HORTicultural Use and Supply
Creators: name: Bunte, Frank H.J.
name: Van Galen, Michiel A.
name: Bunte, Frank H.J.
name: Van Galen, Michiel A.
Publisher: name: Unknown
Year: 2005
Subjects: Crop Production/Industries

description: This report describes the economics and data structure of the HORTUS partial equilibrium supply and demand model developed at LEI. HORTUS can be used to simulate the effects of policy changes and exogenous changes in costs, production and consumer trends on the production, trade and consumption patterns of vegetables and fruits in the Netherlands and other European countries. The report demonstrates the use and working of the model by means of two simulations: (1) a general reduction of import tariffs in the EU and (2) a rise in heating gas prices in the Netherlands.
Surface-enhanced Raman scattering and fluorescence near metal nanoparticles
Creators: name: Johansson, Peter
name: Xu, Hongxing
name: Käll, Mikael
name: ;
Publisher: name: arXiv
Year: 2005
Subjects: subject: Other Condensed Matter (cond-mat.other)
subject: FOS: Physical sciences

description: We present a general model study of surface-enhanced resonant Raman scattering and fluorescence, focusing on the interplay between electromagnetic (EM) effects and the molecular dynamics as treated by a density matrix calculation. The model molecule has two electronic levels, is affected by radiative and non-radiative damping mechanisms, and a Franck-Condon mechanism yields electron-vibration coupling. The coupling between the molecule and the electromagnetic field is enhanced by placing it between two Ag nanoparticles. The results show that the Raman scattering cross section can, for realistic parameter values, increase by some 10 orders of magnitude (to $\sim10^{-14}$ cm$^2$) compared with the free-space case. Also the fluorescence cross section grows with increasing EM enhancement, however, at a slower rate, and this increase eventually stalls when non-radiative decay processes become important. Finally, we find that anti-Stokes Raman scattering is possible with strong incident laser intensities, $\sim 1$ mW/$μ$m.
description: 18 pages, 14 figures
NLO QCD corrections to Higgs boson pair production
Creators: name: Baglio, J.
name: Campanario, Francisco
name: Glaus, Seraina
name: Mühlleitner, Milada Margarete
name: Ronca, J.
name: Spira, M.
Publisher: name: Karlsruher Institut für Technologie (KIT)
Year: 2020

description: In this contribution the next-to-leading (NLO) QCD corrections to Higgs boson pair production are discussed. A brief sketch of the calculation is given. The differential cross section as a function of the invariant Higgs pair mass and the total hadronic cross section are presented. Furthermore, the uncertainties not only from the renormalisation and factorisation scales but also the uncertainties due to the scheme-and-scale choice of the top mass are shown. In addition, the effects of varying the Higgs self-coupling strength on the cross section are investigated.
Stellar Populations in Nearby Lenticular Galaxies
Creators: name: Sil'chenko, Olga K.
Publisher: name: arXiv
Year: 2005
Subjects: subject: Astrophysics (astro-ph)
subject: FOS: Physical sciences

description: We have obtained 2D spectral data for a sample of 58 nearby S0 galaxies with the Multi-Pupil Spectrograph of the 6m telescope of the Special Astrophysical Observatory of the Russian Academy of Sciences. The Lick indices H-beta, Mgb, and are calculated separately for the nuclei and for the bulges taken as the rings between R=4" and 7"; and the luminosity-weighted ages, metallicities, and Mg/Fe ratios of the stellar populations are estimated by confronting the data to SSP models. Four types of galaxy environments are considered: clusters, centers of groups, other places in groups, and field. The nuclei are found to be on average slightly younger than the bulges in any types of environments, and the bulges of S0s in the sparse environments are younger than those in the dense environments. The effect can be partly attributed to the well-known age correlation with the stellar velocity dispersion in early-type galaxies (in our sample the galaxies in sparse environements are on average less massive than those in dense environments). However for the most massive S0s, with the stellar velocity dispersion of 170-220 km/s, the age dependence on the environment is still significant at the confidence level of 1.5 sigma.
description: 31 pages, 8 figures; accepted to the Astrophysical Journal
Quantum nano-electromechanics with electrons, quasiparticles and Cooper pairs: effective bath descriptions and strong feedback effects
Creators: name: Clerk, A. A.
name: Bennett, S.
Publisher: name: arXiv
Year: 2005
Subjects: subject: Mesoscale and Nanoscale Physics (cond-mat.mes-hall)
subject: FOS: Physical sciences

description: Using a quantum noise approach, we discuss the physics of both normal metal and superconducting single electron transistors (SET) coupled to mechanical resonators. Particular attention is paid to the regime where transport occurs via incoherent Cooper-pair tunneling (either via the Josephson quasiparticle (JQP) or double Josephson quasiparticle (DJQP) process). We show that, surprisingly, the back-action of tunneling Cooper pairs (or superconducting quasiparticles) can be used to significantly cool the oscillator. We also discuss the physical origin of negative damping effects in this system, and how they can lead to a regime of strong electro-mechanical feedback, where despite a weak SET - oscillator coupling, the motion of the oscillator strongly effects the tunneling of the Cooper pairs. We show that in this regime, the oscillator is characterized by an energy-dependent effective temperature. Finally, we discuss the strong analogy between back-action effects of incoherent Cooper-pair tunneling and ponderomotive effects in an optical cavity with a moveable mirror; in our case, tunneling Cooper pairs play the role of the cavity photons.
description: 27 pages, 7 figures; submitted to the New Journal of Physics focus issue on Nano-electromechanical Systems; error in references corrected