cometadata/datacite-rtg-text-other-reclassification-records huggingface dataset:
Statistical mechanics of two-dimensional turbulence
Creators: name: Jung, Sunghwan
name: Morrison, P. J.
name: Swinney, Harry L.
Publisher: name: arXiv
Year: 2005
Subjects: subject: Soft Condensed Matter (cond-mat.soft)
subject: Statistical Mechanics (cond-mat.stat-mech)
subject: FOS: Physical sciences

description: The statistical mechanical description of two-dimensional inviscid fluid turbulence is reconsidered. Using this description, we make predictions about turbulent flow in a rapidly rotating laboratory annulus. Measurements on the continuously forced, weakly dissipative flow reveal coherent vortices in a mean zonal flow. Statistical mechanics has two crucial requirements for equilibrium: statistical independence of macro-cells (subsystems) and additivity of invariants of macro-cells. We use additivity to select the appropriate Casimir invariants from the infinite set available in vortex dynamics, and we do this in such a way that the exchange of micro-cells within a macro-cell does not alter an invariant of a macro-cell. A novel feature of the present study is our choice of macro-cells, which are continuous phase space curves based on mean values of the streamfunction. Quantities such as energy and enstrophy can be defined on each curve, and these lead to a local canonical distribution that is also defined on each curve. Our approach leads to the prediction that on a mean streamfunction curve there should be a linear relation between the ensemble-averaged potential vorticity and the time-averaged streamfunction, and our laboratory data are in good accord with this prediction. Further, the approach predicts that although the probability distribution function for potential vorticity in the entire system is non-Gaussian, the distribution function of micro-cells should be Gaussian on the macro-cells, i.e., for curves defined by mean values of the streamfunction. This prediction is also supported by the data. While the statistical mechanics approach used was motivated by and applied to experiments on turbulence in a rotating annulus, the approach is quite general and is applicable to a large class of Hamiltonian systems.
Validating the Effectiveness of Data-Driven Gamification Recommendations: An Exploratory Study
Creators: name: Toda, Armando
name: Palomino, Paula
name: Rodrigues, Luiz
name: Oliveira, Wilk
name: Shi, Lei
name: Isotani, Seiji
name: Cristea, Alexandra
Publisher: name: arXiv
Year: 2020
Subjects: subject: Human-Computer Interaction (cs.HC)
subject: FOS: Computer and information sciences

description: Gamification design has benefited from data-driven approaches to creating strategies based on students characteristics. However, these strategies need further validation to verify their effectiveness in e-learning environments. The exploratory study presented in this paper thus aims at verifying how data-driven gamified strategies are perceived by the students, i.e., the users of e-learning environments. In this study, we conducted a survey presenting 25 predefined strategies, based on a previous study, to students and analysed each strategys perceived relevance, instanced in an e-learning environment. Our results show that students perceive Acknowledgement, Objective and Progression as important elements in a gamified e-learning environment. We also provide new insights about existing elements and design recommendations for domain specialists.
Nonmetricity and torsion induced by dilaton gravity in two dimension
Creators: name: Adak, Muzaffer
Publisher: name: arXiv
Year: 2005
Subjects: subject: General Relativity and Quantum Cosmology (gr-qc)
subject: FOS: Physical sciences

description: We develop a theory in which there are couplings amongst Dirac spinor, dilaton and non-Riemannian gravity and explore the nature of connection-induced dilaton couplings to gravity and Dirac spinor when the theory is reformulated in terms of the Levi-Civita connection. After presenting some exact solutions without spinors, we investigate the minimal spinor couplings to the model and in conclusion we can not find any nontrivial dilaton couplings to spinor.
description: Added references, Accepted for publication in GRG
Quantum calibration of measuring apparatuses
Creators: name: D'Ariano, Giacomo Mauro
name: Maccone, Lorenzo
name: Presti, Paoloplacido Lo
Publisher: name: arXiv
Year: 2004
Subjects: subject: Quantum Physics (quant-ph)
subject: FOS: Physical sciences

description: By quantum calibration we name an experimental procedure apt to completely characterize an unknown measurement apparatus by comparing it with other calibrated apparatuses. Here we show how to achieve the calibration of an arbitrary measuring apparatus, by using it in conjunction with a ``tomographer'' in a correlation setup with an input bipartite system. The method is robust to imperfections of the tomographer, and works for practically any input state of the bipartite system.
description: Submitted to Phys. Rev. Lett
Livestock Systems and Their Performance in Poor Endowment Regions of India
Creators: name: Chandel, B.S.
name: Malhotra, Ravinder
name: Chandel, B.S.
name: Malhotra, Ravinder
Publisher: name: Unknown
Year: 2006
Subjects: Agricultural and Food Policy

description: The study pertaining to the semi-arid tropic region of the country, which has maximum concentration of livestock, has identified livestock systems, investigated their performance, and determined their carrying capacity. Seven major livestock systems have been identified using cluster analysis: cattle, buffalo, cattle-buffalo-goat, cattle-goat, cattle-sheep, sheep-goat-cattle and the mixed. The cattle-livestock system has been found to be the most dominating system while sheep-goat-cattle system has been the least important system. Milk productivity and adoption of crossbred technology have been found highest in the buffalo-based livestock systems (buffalo, cattle-buffalo-goat, mixed), which are the systems prevalent in the agriculturally developed and socio-economically rich areas. Vast differences have been observed in the existing averages and exploitable potential in the milk productivity and adoption of the crossbred technology in cattle-based livestock systems (cattle, cattle-goat, cattle-sheep, sheep-goat-cattle). The research and development efforts need to be concentrated on these livestock systems in increasing the dry matter (DM) availability for which agricultural development is inevitable, and to develop a suitable crossbred technology thriving best in the marginal areas. The resultant increase in productivity will reduce the existing status of livestock units (LUs) per thousand hectares, which has been observed to be more than the carrying capacity in the cattle-based livestock systems.
title: Nurses' knowledge, perceptions, and attitudes toward the use of electronic medical records: a case study of Riyadh and Jeddah city
Creators: name: Almutairi, Afrah
Publisher: name: University of Reading
Year: 2018

description: Electronic Medical Records (EMR) are an important emergmg aspect of health information technology in Saudi Arabia where benefits and opportunities of ongoing investment in this area to strengthen the health provision in Saudi Arabia, are balanced by the threats and exposure of weaknesses in the system if implementation ofEMR is not successfully achieved. Nurses are an important group of staff within any hospital and their involvement is key to successful introduction of EMR. However, to date, few studies have focussed exclusively on the perceptions of nurses to EMR and even fewer studies with regards to nurses in Saudi Arabia. The main aim of this PhD has been to investigate the perceptions, knowledge, and attitudes of nurses in Riyadh and leddah City toward the use of electronic medical records. The research was undertaken using a mixed methods approach, comprising two largely quantitative studies, the Pilot (n=230) conducted in a single institution, and the Main study (n= 1427) distributed to nurses at all levels of their careers in private and public hospitals in Riyadh and leddah City; and a smaller qualitative study consisting of interviews and focus groups undertaken with staff in Riyadh and leddah hospitals to explore further specific issues. The study found that factors such as age, gender, nationality, education, and especially prior experience with EMR and confidence with the use of technology playa significant role in defining nurses' attitudes towards EMR. From these findings the study makes recommendations for areas that should be considered further as part of the introduction strategy of EMR in hospitals in Riyadh and leddah City to improve positivity about EMR and hence facilitate successful implementation, uptake and use. The study also considered how well current Technology Acceptance Models (TAM) can be used to describe the uptake of EMR by nurses in Saudi hospitals resulting in an adaptation to the TAM to form the Nurses Acceptance Model (NAM).
Software-Defined Network for End-to-end Networked Science at the Exascale
Creators: name: Monga, Inder
name: Guok, Chin
name: MacAuley, John
name: Sim, Alex
name: Newman, Harvey
name: Balcas, Justas
name: DeMar, Phil
name: Winkler, Linda
name: Lehman, Tom
name: Yang, Xi
Publisher: name: arXiv
Year: 2020
Subjects: subject: Networking and Internet Architecture (cs.NI)
subject: FOS: Computer and information sciences

description: Domain science applications and workflow processes are currently forced to view the network as an opaque infrastructure into which they inject data and hope that it emerges at the destination with an acceptable Quality of Experience. There is little ability for applications to interact with the network to exchange information, negotiate performance parameters, discover expected performance metrics, or receive status/troubleshooting information in real time. The work presented here is motivated by a vision for a new smart network and smart application ecosystem that will provide a more deterministic and interactive environment for domain science workflows. The Software-Defined Network for End-to-end Networked Science at Exascale (SENSE) system includes a model-based architecture, implementation, and deployment which enables automated end-to-end network service instantiation across administrative domains. An intent based interface allows applications to express their high-level service requirements, an intelligent orchestrator and resource control systems allow for custom tailoring of scalability and real-time responsiveness based on individual application and infrastructure operator requirements. This allows the science applications to manage the network as a first-class schedulable resource as is the current practice for instruments, compute, and storage systems. Deployment and experiments on production networks and testbeds have validated SENSE functions and performance. Emulation based testing verified the scalability needed to support research and education infrastructures. Key contributions of this work include an architecture definition, reference implementation, and deployment. This provides the basis for further innovation of smart network services to accelerate scientific discovery in the era of big data, cloud computing, machine learning and artificial intelligence.
description: To appear in the journal of Future Generation Computer Systems
Feynman Diagrams and the Quantum Stochastic Calculus
Creators: name: Gough, John
Publisher: name: arXiv
Year: 2004
Subjects: subject: Quantum Physics (quant-ph)
subject: FOS: Physical sciences

description: We present quantum stochastic calculus in terms of diagrams taking weights in the algebra of observables of some quantum system. In particular, we note the absence of non-time-consecutive Goldstien diagrams. We review recent results in Markovian limits in these terms.
description: 14 pages, multiple embedded latex pictures
Livelihood Diversification and Rural-Urban Linkages in Vietnam’s Red River Delta
Creators: name: Thanh, Hoang Xuan
name: Anh, Dang Nguyen
name: Tacoli, Cecilia
name: Thanh, Hoang Xuan
name: Anh, Dang Nguyen
name: Tacoli, Cecilia
Publisher: name: Unknown
Year: 2005
Subjects: subject: Community/Rural/Urban Development
subject: migration
subject: diversification
subject: poverty
subject: rural-urban linkages
subject: Vietnam

description: With high population density and limited land availability, Vietnam’s Red River Delta is undergoing a major transformation as its economic base moves away from subsistence farming towards intensive, high-value food production for export and local urban markets, and nonfarm employment. This paper describes the changing livelihoods of the residents of two villages that represent two different pathways to local economic development. One village relies primarily on agricultural intensification and diversification, although in combination with nonfarm activities. These nonfarm activities are either supplementary (such as handicraft production and seasonal migration) or related to farming, such as provision of agricultural services, transport and trade of agricultural produce. To a large extent, it is this nonfarm income that allows investment in agriculture at the household level. Residents of the second village, although nominally still owning rice farms, have effectively moved out of agriculture and engage almost exclusively in handicraft production. Despite these major differences, there are also important similarities between the two villages. First, much of their recent economic development is linked to access to markets—including proximity to local urban centers and to Hanoi (where demand from urban consumers and from exporting enterprises has increased substantially), a vastly improved road and transport system, and an excellent communications infrastructure. Second, each village has developed forward and backward linkages with their main production sector. Last but not least, local authorities have played an important role in supporting local economic development, providing infrastructure, training for handicraft production, and inputs for farmers. The long-term sustainability of economic growth and poverty reduction in the Red River Delta will largely depend on strengthening rural-urban linkages. This includes adopting regulations on land use that allow farmers to better respond to growing urban demand for high-value produce; incorporate more explicitly the needs of the handicraft micro-enterprises in existing and future policies and plans for rural industrialization; recognize and support the role of seasonal migration in rural local economic development; and address the changing planning and natural resource management needs of these urbanizing villages.
КЛИНИЧЕСКИЕ ПОКАЗАТЕЛИ БРОНХОЛЕГОЧНОЙ ДИСПЛАЗИИ У НЕДОНОШЕННЫХ НОВОРОЖДЕННЫХ
Creators: name: Салихова К. Ш.,  Марифалиева М.З. Республиканский специализированный научно-практический медицинский центр педиатрии
Publisher: name: Zenodo
Year: 2024

description: В мире проводятся научные исследования механизмов патогенеза, течения, терапии и исходов БЛД. Определение факторов риска и механизмов патогенеза, методах ранней диагностики, патогенетически направленного лечения и профилактики вторичных повреждений легочной паренхимы у новорожденных актуальны и в наше время Одним из значимыми критериями патологического процесса при развитие БЛД у новорожденных являются клинические показатели
k-dependent spectrum and optical conductivity near metal-insulator transition in multi-orbital Hubbard bands
Creators: name: Miura, Oki
name: Fujiwara, Takeo
Publisher: name: arXiv
Year: 2004
Subjects: subject: Strongly Correlated Electrons (cond-mat.str-el)
subject: FOS: Physical sciences

description: We apply the dynamical mean field theory (DMFT) in the iterative perturbation theory(IPT) to doubly degenerate eg bands and triply degenerate tg bands on a simple cubic lattice and calculate the spectrum and optical conductivity in arbitrary electron occupation. The spectrum simultaneously shows the effects of multiplet structure and DMFT together with the electron ionization and affinity levels of different electron occupations, coherent peaks at the Fermi energy in the metallic phase and a gap at an integer filling of electrons for sufficiently large Coulomb U. We also calculate the critical value of the Coulomb U for degenerate orbitals.
description: 8 pages, 6 figures
Phase diagram and mechanism of superconductivity in a strongly correlated electron system
Creators: name: Yanagisawa, Takashi
name: Miyazaki, Mitake
name: Yamaji, Kunihiko
Publisher: name: arXiv
Year: 2020
Subjects: subject: Strongly Correlated Electrons (cond-mat.str-el)
subject: Superconductivity (cond-mat.supr-con)
subject: FOS: Physical sciences

description: We investigate the phase diagram of two-dimensional (2D) Hubbard model by employing the optimization variational Monte Carlo method. The 2D Hubbard model is the most simple electronic model for cuprate high-temperature superconductors. The phase diagram consists of three regions; they are antiferromagnetic insulator (AFI) region, superconducting (SC) region and the coexistent region of superconductivity and antiferromgantism. The phase diagram obtained by numerical calculations well agrees with the experimental phase diagram for high-temperature cuprates. We mainly focused on the effect of $t'$ on the antiferromagnetic (AF) correlation and the AFI region. The area of the AF phase increases when we include $t'$ and thus the pure $d$-wave SC phase decreases. The AFI phase near half filling decreases as $|t'|$ increases.
Evaluation and Renovation Strategy of Buildings in Mountainous Towns from the Perspectives of Nature and Culture: Taking Ciping Town, Jinggangshan as an Example
Creators: name: CHEN Xuanming
name: LUO Qi
name: CHEN Xuanming
name: LUO Qi
Publisher: name: Unknown
Year: 2020
Subjects: subject: Agribusiness
subject: Mountainous town, Nature, Culture, Architectural evaluation

description: In recent years, as a new growth point of China's economic development, small towns are under construction in full swing[1]. But with the rapid expansion, many problems that the city scholars and builders think about have emerged. The problems in the construction of small towns are mainly reflected in the over development of capital, insufficient understanding on culture, deviation of construction strategies, etc. In many small towns, there is an imbalance between the volume and color of buildings, the architectural form is single[2], and the expression of local culture is insufficient. From the perspectives of nature and culture, the architecture of Ciping Town, a mountainous town, is evaluated. In view of the problems found, this paper puts forward its thinking on the buildings in this type of small towns, so as to provide some reference for the development of architecture in this type of small towns.
Vehicle Redistribution in Ride-Sourcing Markets using Convex Minimum Cost Flows
Creators: name: Karamanis, Renos
name: Anastasiadis, Eleftherios
name: Stettler, Marc
name: Angeloudis, Panagiotis
Publisher: name: arXiv
Year: 2020
Subjects: subject: Data Structures and Algorithms (cs.DS)
subject: Systems and Control (eess.SY)
subject: FOS: Computer and information sciences
subject: FOS: Electrical engineering, electronic engineering, information engineering

description: Ride-sourcing platforms often face imbalances in the demand and supply of rides across areas in their operating road-networks. As such, dynamic pricing methods have been used to mediate these demand asymmetries through surge price multipliers, thus incentivising higher driver participation in the market. However, the anticipated commercialisation of autonomous vehicles could transform the current ride-sourcing platforms to fleet operators. The absence of human drivers fosters the need for empty vehicle management to address any vehicle supply deficiencies. Proactive redistribution using integer programming and demand predictive models have been proposed in research to address this problem. A shortcoming of existing models, however, is that they ignore the market structure and underlying customer choice behaviour. As such, current models do not capture the real value of redistribution. To resolve this, we formulate the vehicle redistribution problem as a non-linear minimum cost flow problem which accounts for the relationship of supply and demand of rides, by assuming a customer discrete choice model and a market structure. We demonstrate that this model can have a convex domain, and we introduce an edge splitting algorithm to solve a transformed convex minimum cost flow problem for vehicle redistribution. By testing our model using simulation, we show that our redistribution algorithm can decrease wait times by more than 50%, increase profit up to 10% with less than 20% increase in vehicle mileage. Our findings outline that the value of redistribution is contingent on localised market structure and customer behaviour.
description: 12 pages, 9 figures, in IEEE Transactions on Intelligent Transportation Systems
Neutrino Oscillations in a Supersymmetric SO(10) Model with Type-III See-Saw Mechanism
Creators: name: Fukuyama, Takeshi
name: Ilakovac, Amon
name: Kikuchi, Tatsuru
name: Matsuda, Koichi
Publisher: name: arXiv
Year: 2005
Subjects: subject: High Energy Physics - Phenomenology (hep-ph)
subject: FOS: Physical sciences

description: The neutrino oscillations are studied in the framework of the minimal supersymmetric SO(10) model with Type-III see-saw mechanism by additionally introducing a number of SO(10) singlet neutrinos. The light Majorana neutrino mass matrix is given by a combination of those of the singlet neutrinos and the $SU(2)_L$ active neutrinos. The minimal SO(10) model gives an unambiguous Dirac neutrino mass matrix, which enables us to predict the masses and the other parameters for the singlet neutrinos. These predicted masses take the values accessible and testable by near future collider experiments under the reasonable assumptions. More comprehensive calculations on these parameters are also given.
description: 14 pages, 5 figures; the version to appear in JHEP
Object volume reconstruction and pose estimation from monocular video
Creators: name: Nasiri Avanaki, Alireza
Publisher: name: University of British Columbia
Year: 2009

description: Acquiring a three-dimensional perception of an object or a scene, from regular (single-camera and 2-D) video, is a trivial task for humans. The automatic implementation of such a task has been, and still is, one of the major problems of computer vision. The new approach introduced in this thesis focuses on volume reconstruction of an object from image sequences taken by a single camera. One of the numerous applications of this approach is 3-D object tracking in video. This can be used in very low bit-rate customized video transmission schemes. A multi-objective pose estimation method is introduced that computes object relative pose between two input frames. One advantages of this method is that it does not use any feature point, thus it does not suffer from problems with feature point detection and tracking. Also, the method does not assume any model for the object at the outset, hence it can be applied to an arbitrary object. The method, however, requires a depth-map, which is not readily available from an image sequence. To overcome this requirement, an iterative scheme is employed. The first round of pose estimation between consequent frames is performed, assuming flat depth-maps. Pose estimates are then adjusted to reduce the error by maximizing a novel quality factor for shape-from-silhouette volume reconstruction. Shape-from-silhouette is applied to construct a 3-D model (volume), which provides depth-maps for the next round of pose estimation. The feedback loop is terminated when pose estimates do not change much, as compared to those produced by the previous iteration. Based on our theoretical study of the proposed system, a test of convergence to a given set of poses is devised. To handle input sequences with unknown frame order, the input sequence undergoes a preprocessing stage, in which the frames of the sequence are re-ordered to obtain the most accurate pose estimation. A theoretical validity criterion for volume reconstruction by shape-from-silhouette is established. This criterion is used to produce a volume reconstruction quality factor, which plays an important role in pose estimation adjustment. The reliable performance of our system is proved via several simulations carried on both synthetic and real image sequences. Effects of pose sampling rate, distribution of pose samples, and error in input pose on volume reconstruction quality by shape-from-silhouette are studied. It is shown that high levels of pose error cannot be compensated by increase in pose sampling rate, and that volume reconstruction at high pose sampling rates is more sensitive to pose error.
title: A systematic method of developing information sharing systems based on activity theory
Creators: name: Alhefeiti, Abdulla Ali
Publisher: name: University of Reading
Year: 2018

description: Information sharing in policing enables proactive and preventative work to enhance welfare, security and safety for the public; however, achieving these goals requires having an effective and efficient mechanism for sharing information within and between organisations. There is currently no systematic approach to specifically analyse the requirements of an information sharing system, which motivates the need to develop such an approach. In this research, the Activity Theory was taken as a basis to identify the requirements of the approach and design a suitable framework, which was then evaluated through the use of two case studies in the public sector in the United Arab Emirates (UAE). This research aims to design an information sharing framework that takes proper account of the actors and their activities to improve the information sharing system. To this end, it presents the development of the Activity Theory-based Information Sharing Analysis (AcTIShA) Framework, proposing a mechanism for analysing the information need and supporting the information sharing. This framework incorporates the concept of information analysis adopted from the Activity Theory, which is used for understanding the information. The Activity Theory plays a crucial role in analysing the elements concerned with the information, such as actors, actions, information artefacts and purposes within the organisation’s activities. To illustrate the application of the AcTIShAFramework, a system design based on its use is demonstrated. The design science research paradigm is adopted to evaluate the outcomes of the framework through two case studies. These were carried out in two different public sectors of the UAE, namely the Ministry of Interior and the Ministry of Health, to evaluate the AcTIShA-Framework. The focus group method was conducted with a variety of participants from both sectors to discuss and evaluate the information sharing mechanism. It is demonstrated that the framework provides a systematic and versatile approach to be utilised to improve the sharing of the information among organisations, and that it will benefit the development of information sharing systems. The conclusions, contributions and suggestions drawn from this study are used to extend the activities of information sharing. Finally, the research provides guidance for developing information sharing systems.
Market Institutions: Enhancing the Value of Rural-Urban Links
Creators: name: Chowdhury, Shyamal K.
name: Negassa, Asfaw
name: Torero, Maximo
name: Chowdhury, Shyamal K.
name: Negassa, Asfaw
name: Torero, Maximo
Publisher: name: Unknown
Year: 2005
Subjects: subject: Community/Rural/Urban Development
subject: International Development
subject: market
subject: institution
subject: value
subject: urban
subject: rural
subject: Bangladesh
subject: Ethiopia
subject: Indonesia
subject: Kenya
subject: Peru

description: This paper examines how market institutions can affect links between urban and rural areas with specific emphasis on goods market integration in the national context. Traditionally, development researchers and practitioners have focused either on rural market development or on urban market development without considering the interdependencies and synergies between the two. However, more than ever before, emerging local and global patterns such as the modern food value-chain led by supermarkets and food processors, rapid urbanization, changes in dietary composition, and enhanced information and communication technologies point to the need to pay close attention to the role of markets both in linking rural areas with intermediate cities and market towns and promotion of economic development and poverty reduction. This paper begins with a presentation of a conceptual framework of market integration and then identifies five major factors that increase the transfer costs that subsequently hinder market integration between rural and urban areas: information asymmetry, transaction costs, transport and communication costs, policy induced barriers, and social and noneconomic factors. Five specific cases in five developing countries are examined in this study to demonstrate the primary sources of transfer costs and the aspects of market institutions that are important to market integration and promotion of rural-urban linkages. While emerging institutions such as modern intermediaries linked to supermarkets and food processors can reduce information asymmetries between rural producers and urban consumers, existing institutions such as producers’ cooperatives can pool the risks, increase the bargaining power of small producers, reduce enforcement costs, and thereby reduce transaction costs. In addition, new types of partnerships between businesses and NGOs, and between public and private sectors, can improve infrastructure provision which, in turn, can reduce transport and communication costs. To the contrary, the presence of inappropriate policies or noneconomic factors such as those that involve social exclusion take on a negative role in linking urban and rural markets.
Subdiffusion in a 1D Anderson insulator with random dephasing: Finite-size scaling, Griffiths effects, and possible implications for many-body localization
Creators: name: Taylor, Scott Richard
name: Scardicchio, Antonello
Publisher: name: arXiv
Year: 2020
Subjects: subject: Disordered Systems and Neural Networks (cond-mat.dis-nn)
subject: Strongly Correlated Electrons (cond-mat.str-el)
subject: FOS: Physical sciences

description: We study transport in a one-dimensional boundary-driven Anderson insulator (the XX spin chain with onsite disorder) with randomly positioned onsite dephasing, observing a transition from diffusive to subdiffusive spin transport below a critical density of sites with dephasing. This model is intended to mimic the passage of an excitation through (many-body) insulating regions or ergodic bubbles, therefore providing a toy model for the diffusion-subdiffusion transition observed in the disordered Heisenberg model [1]. We also present the exact solution of a semiclassical model of conductors and insulators introduced in Ref. 2, which exhibits both diffusive and subdiffusive phases, and qualitatively reproduces the results of the quantum system. The critical properties of both models, when passing from diffusion to subdiffusion, are interpreted in terms of "Griffiths effects". We show that the finite-size scaling comes from the interplay of three characteristic lengths: one associated with disorder (the localization length), one with dephasing, and the third with the percolation problem defining large, rare, insulating regions. We conjecture that the latter, which grows logarithmically with system size, may potentially be responsible for the fact that heavy-tailed resistance distributions typical of Griffiths effects have not been observed in subdiffusive interacting systems.
description: 15 pages, 11 figures. Paper restructured and discussions extended
Tuning the Electronic Levels of NiO with Alkali Halides Surface Modifiers for Perovskite Solar Cells
Creators: name: Apergi, Sofia
name: Brocks, Geert
name: Tao, Shuxia
Publisher: name: arXiv
Year: 2020
Subjects: subject: Materials Science (cond-mat.mtrl-sci)
subject: FOS: Physical sciences

description: Favorable optoelectronic properties and ease of fabrication make NiO a promising hole transport layer for perovskite solar cells. To achieve maximum efficiency, the electronic levels of NiO need to be optimally aligned with those of the perovskite absorber. Applying surface modifiers by adsorbing species on the NiO surface, is one of the most widespread strategies to tune its energy levels. Alkali halides are simple inorganic surface modifiers that have been extensively used in organic optoelectronics, however, rarely studied in perovskite solar cells. Using density functional theory (DFT) calculations, we investigate the effect of single layer adsorption of twenty different alkali halides on the electronic levels of NiO. Our results show that alkali halides can shift the position of the valence band maximum (VBM) of NiO to a surprisingly large extend in both directions, from -3:10 eV to +1:59 eV. We interpret the direction and magnitude of the shift in terms of the surface dipoles, formed by the adsorbed cations and anions, where the magnitude of the VBM shift is a monotonic function of the surface coverage. Our results indicate that with alkali halide surface modifiers, the electronic levels of NiO can be tuned robustly and potentially match those of many perovskite compositions in perovskite solar cells.
description: 11 pages and 9 figures
title: Outstanding schools in Saudi Arabia: leadership practices, culture and professional development
Creators: name: Alhammadi, Muteb
Publisher: name: University of Reading
Year: 2018

description: As Saudi Arabia strives to position itself strategically in global markets in response to globalization, education has become one of the most important tools to achieve this aim. While demands for reform in Western countries have fostered new notions of school excellence, equivalent concepts have to date received little attention in Saudi Arabia. This study aims to fill this gap by exploring the nature of outstanding schools in Saudi Arabia, and thus claims to be an original and important contribution to the understanding of this phenomenon. A qualitative case-study approach was used drawing on data from three high schools in Saudi Arabia, each having been rated outstanding by the city’s local authority. Principals, Deputies and Social Instructors from the three schools were interviewed (n=9), while group interviews were conducted with the majority of teachers from each school (n=68; 25 out of 26 teachers from school 1; 20 out of 24 teachers from school 2 and 23 out of 28 from school 3. In addition, the daily work of Principals in each school was observed and relevant documents were collected. The resulting data were thematically analysed using a framework based on the inter-related concepts of leadership practices, culture and professional development The findings reveal that leadership practices in these outstanding schools included a number of common features, such as establishing school vision, restructuring the organisation, leadership distribution, effective communication, strategic planning and quality assurance. Cultural aspects revealed the effect of both macro-level cultures: global and national cultures on these schools, as well as micro-scale effects. Professional development was perceived to be important, and both leaders and teachers engaged in training opportunities. While these results cannot be generalised, it is hoped that they will be important to inform practitioners, policy makers and researchers about the nature of outstanding schools in Saudi Arabia.
Museum repository numbers for figured material from Cambrian carbonaceous protoconodonts and the early fossil record of the Chaetognatha
Creators: name: Slater, Ben James
Publisher: name: The Royal Society
Year: 2025
Subjects: classificationCode: 370506
subject: Palaeontology (incl. palynology)

description: Museum slide numbers, specimen numbers, and England Finder coordinates for figured specimens.
Predicting MOOCs Dropout Using Only Two Easily Obtainable Features from the First Week's Activities
Creators: name: Alamri, Ahmed
name: Alshehri, Mohammad
name: Cristea, Alexandra I.
name: Pereira, Filipe D.
name: Oliveira, Elaine
name: Shi, Lei
name: Stewart, Craig
Publisher: name: arXiv
Year: 2020
Subjects: subject: Human-Computer Interaction (cs.HC)
subject: Machine Learning (cs.LG)
subject: FOS: Computer and information sciences

description: While Massive Open Online Course (MOOCs) platforms provide knowledge in a new and unique way, the very high number of dropouts is a significant drawback. Several features are considered to contribute towards learner attrition or lack of interest, which may lead to disengagement or total dropout. The jury is still out on which factors are the most appropriate predictors. However, the literature agrees that early prediction is vital to allow for a timely intervention. Whilst feature-rich predictors may have the best chance for high accuracy, they may be unwieldy. This study aims to predict learner dropout early-on, from the first week, by comparing several machine-learning approaches, including Random Forest, Adaptive Boost, XGBoost and GradientBoost Classifiers. The results show promising accuracies (82%-94%) using as little as 2 features. We show that the accuracies obtained outperform state of the art approaches, even when the latter deploy several features.
description: Intelligent Tutoring Systems. ITS 2019. Lecture Notes in Computer Science, vol 11528. Springer, Cham
Decay properties of the X-ray afterglows of Gamma-ray bursts
Creators: name: Gendre, B.
name: Boer, M.
Publisher: name: arXiv
Year: 2004
Subjects: subject: Astrophysics (astro-ph)
subject: FOS: Physical sciences

description: We present a set of seventeen Gamma-Ray Bursts (GRBs) with known redshifts and X-ray afterglow emission. We apply cosmological corrections in order to compare their fluxes normalized at a redshift of 1. Two classes of GRB can be defined using their X-ray afterglow light curves. We show that the brightest afterglows seem to decay faster than the dimer ones. We also point out evidences for a possible flux limit of the X-ray afterglow depending on the time elapsed since the burst. We try to interpret these observations in the framework of the canonical fireball model of GRB afterglow emission.
description: 7 pages, 3 color figures and 1 B&W figure. Accepted for publication in Astronomy and Astrophysics
Molecular data and the evolutionary history of dinoflagellates
Creators: name: Saldarriaga Echavarría, Juan Fernando
Publisher: name: University of British Columbia
Year: 2009

description: New sequences of ribosomal and protein genes were combined with available morphological and paleontological data to produce a phylogenetic framework for dinoflagellates. The evolutionary history of some of the major morphological features of the group was then investigated in the light of that framework. Phylogenetic trees of dinoflagellates based on the small subunit ribosomal RNA gene (SSU) are generally poorly resolved but include many wellsupported clades, and while combined analyses of SSU and LSU (large subunit ribosomal RNA) improve the support for several nodes, they are still generally unsatisfactory. Protein-gene based trees lack the degree of species representation necessary for meaningful in-group phylogenetic analyses, but do provide important insights to the phylogenetic position of dinoflagellates as a whole and on the identity of their close relatives. Molecular data agree with paleontology in suggesting an early evolutionary radiation of the group, but whereas paleontological data include only taxa with fossilizable cysts, the new data examined here establish that this radiation event included all dinokaryotic lineages, including athecate forms. Plastids were lost and replaced many times in dinoflagellates, a situation entirely unique for this group. Histones could well have been lost earlier in the lineage than previously assumed. The closest relatives to the dinokaryotic dinoflagellates appear to be apicomplexans, Perkinsus and Parvilucifera, syndinians and Oxyrrhis. Gonyaulacales, Dinophysiales and an expanded Suessiales are all holophyletic orders, while Gymnodiniales, Blastodiniales and Phytodiniales as currently circumscribed are polyphyletic. Peridiniales is likely to be a paraphyletic taxon that probably gave rise to Dinophysiales and Prorocentrales, as well as to several groups of Gymnodiniales and Blastodiniales, and possibly also to Gonyaulacales.
The Hierarchy of Hyperlogics
Creators: name: Coenen, Norine
name: Finkbeiner, Bernd
name: Hahn, Christopher
name: Hofmann, Jana
Publisher: name: arXiv
Year: 2020
Subjects: subject: Logic in Computer Science (cs.LO)
subject: FOS: Computer and information sciences
subject: F.4

description: Hyperproperties, which generalize trace properties by relating multiple traces, are widely studied in information-flow security. Recently, a number of logics for hyperproperties have been proposed, and there is a need to understand their decidability and relative expressiveness. The new logics have been obtained from standard logics with two principal extensions: temporal logics, like LTL and CTL$^*$, have been generalized to hyperproperties by adding variables for traces or paths. First-order and second-order logics, like monadic first-order logic of order and MSO, have been extended with the equal-level predicate. We study the impact of the two extensions across the spectrum of linear-time and branching-time logics, in particular for logics with quantification over propositions. The resulting hierarchy of hyperlogics differs significantly from the classical hierarchy, suggesting that the equal-level predicate adds more expressiveness than trace and path variables. Within the hierarchy of hyperlogics, we identify new boundaries on the decidability of the satisfiability problem. Specifically, we show that while HyperQPTL and HyperCTL$^*$ are both undecidable in general, formulas within their $\exists^*\forall^*$ fragments are decidable.
description: Originally published at LICS 2019
The relation between circular velocity and central velocity dispersion in low surface brightness galaxies
Creators: name: Corsini, E. M.
name: Pizzella, A.
name: Bonta`, E. Dalla
name: Bertola, F.
name: Coccato, L.
name: Sarzi, M.
Publisher: name: arXiv
Year: 2005
Subjects: subject: Astrophysics (astro-ph)
subject: FOS: Physical sciences

description: We analyzed a sample of high and low surface brightness (HSB and LSB) disc galaxies and elliptical galaxies to investigate the correlation between the circular velocity (Vc) and the central velocity dispersion (sigma). We better defined the previous Vc-sigma correlation for HSB and elliptical galaxies, especially at the lower end of the sigma values. Elliptical galaxies with Vc based on dynamical models or directly derived from the HI rotation curves follow the same relation as the HSB galaxies in the V-sigma plane. On the contrary, the LSB galaxies follow a different relation, since most of them show either higher Vc (or lower sigma) with respect to the HSB galaxies. This argues against the relevance of baryon collapse in the radial density profile of the dark matter haloes of LSB galaxies. Moreover, if the Vc-sigma relation is equivalent to one between the mass of the dark matter halo and that of the supermassive black hole, these results suggest that the LSB galaxies host a supermassive black hole with a smaller mass compared to HSB galaxies of equal dark matter halo. On the other hand, if the fundamental correlation of SMBH mass is with the halo Vc, then LSBs should have larger black hole masses for given bulge sigma.
description: 6 pages and 1 figure. To appear in the proceedings of the "Island Universes: Structure and Evolution of Disk Galaxies" conference held in Terschelling, Netherlands, July 2005, ed. R. de Jong (Springer: Dordrecht)
2.5 - 2020 - 17 - Influence of Science Education on the Choice of Entrepreneurial Skills Among Undergraduates of Universities in Ekiti State, Nigeria.pdf
Creators: name: International Journal Of Academic Research In Business, Arts & Science (IJARBAS)
Publisher: name: figshare
Year: 2020
Subjects: subject: 130212 Science, Technology and Engineering Curriculum and Pedagogy
subject: FOS: Educational sciences
subject: 130309 Learning Sciences

description: The study examined the influence of science education on the choice of entrepreneurial skills among undergraduates of Universities in Ekiti State. The descriptive research of the survey type was adopted in this study. The population for the study comprised all undergraduates of Science Education department in public universities in Ekiti State. The sample consisted of 300 respondents drawn from Science Education Department in two universities in Ekiti State. The sample was selected using multi-stage sampling procedure. The research instrument for this study was a self-designed questionnaire titled “Science Education and Choice of Entrepreneurial Skill Questionnaire” (SECESQ). The instrument for the study was validated by experts in the area of Tests and Measurement and Science Education. The reliability of the instrument was determined through test re-test method. A co-efficient of 0.83 was obtained and this is considered high enough to make the instrument reliable and useful for the study. The data collected through the instruments were analyzed using descriptive and inferential statistics. The study revealed that the level of undergraduates’ choices of entrepreneurial skills among science education students in Universities in Ekiti State was moderate. Also, science education was beneficial to undergraduates’ choice of entrepreneurial skill in Universities. It was recommended among others that Science Education students should be encouraged to exhibit positive attitude towards entrepreneurial skills. Also, courses on entrepreneurship studies should be incorporated into Science Education curriculum content by National University Commission.   Keywords: Science Education, Choice, Entrepreneurial Skills, Undergraduates,
https://www.ijarbas.com/2020/05/31/influence-of-science-education-on-the-choice-of-entrepreneurial-skills-among-undergraduates-of-universities-in-ekiti-state-nigeria/
Entwicklung eines Phasenmodells zur Verlagerung von Entwicklungsprojekten nach China in Joint Ventures am Beispiel der Automobilindustrie
Creators: name: Wehlack, Marc
Publisher: name: Universität Kassel
Year: 2021
Subjects: subject: Automobilindustrie
subject: China
subject: Joint Venture
subject: Entwicklungsverlagerung
subject: Phasenmodell
subject: 600
subject: 650
subject: China
subject: Kraftfahrzeugindustrie
subject: Gemeinschaftsunternehmen
subject: Verlagerung
subject: Entwicklung
subject: Projektmanagement

description: Zugleich: Dissertation, Universität Kassel, 2020