cometadata/datacite-rtg-text-other-reclassification-records huggingface dataset:
title: An analysis of ICT policy development and practice in teacher education in Kenya between 1997-2007
Creators: name: Ogange, Beatrice Obura
Publisher: name: The Open University
Year: 2011

description: This study, entitled 'An analysis of ICT policy development and practice in teacher education in Kenya between 1997 and 2007', is a qualitative study that uses a historical interpretive approach involving documentary analysis, interviews and case 'studies, to document the evolution of ICT policies relevant to teacher education in post independence Kenya, and explore the practices among teachers and teacher educators with ICT between 1997 and 2007. It examines the policy- practice relationship in the context of teacher education. The thesis draws from the work of Elmore and also Fullan to understand the change process with educational ICT policies. Not much research has been done in this area in Kenya and this study is therefore a useful contribution to the body of knowledge on leT policy development and practice in teacher education in developing country contexts. The ICT policy process for teacher education in Kenya takes place in a 4-Tier framework that involves international organisations at Tier 1, the Ministry of Education, other ministries and associated bodies at Tier 2, private or public sector organisations at Tier 3, and pre-service and in-service teacher education programmes at Tier 4. There is lack of co-ordination within and between these Tiers, which results in varied practices that portray differential understandings and interpretations of policy in regard to the place of ICT in teacher education.Despite the exposure to ICT training programmes, availability of computers in various institutions and in some instances, a national ICT curriculum, teacher educators' and teachers' practices in subject teaching do not reflect the policy provisions on ICT pedagogic practice. The national ICT policy, therefore, is hyperationalised and not necessarily policy in action as seen in the Case programmes. The policy discourse disjunction and stratification in the 4-Tier ICT policy development and implementation framework is responsible for the slow pace of change in training and teaching practices in Kenya. This thesis proposes that teacher needs and competencies with ICT should be identified in a backward mapping approach. This will ensure transformative practices in teaching and teacher education, reduce the occurrence of hyperationalisation and allow for consensus building regarding the place of ICT in teacher education programmes and teaching in Kenya.
Continuous-discrete entanglement : An example with non-relativistic particles
Creators: name: Harshman, Nathan
Publisher: name: American University
Year: 2023

description: This article discusses entanglement between two subsystems, one with discrete degrees of freedom and the other with continuous degrees of free- dom. The overlap integral between continuous variable wave functions emerges as an important parameter to characterize this kind entangle- ment. “Beam-like” entanglement and “shape-like” entanglement are con- trasted. One example of this kind of entanglement is between between the spin degrees of freedom and the momentum degrees of freedom for a non-relativistic particle. This intraparticle entanglement is Galilean in- variant.
Thin Dielectric Films in Superconducting Cavities
Creators: name: Garwin, E. L.
name: Rabinowitz, Mario
Publisher: name: arXiv
Year: 2003
Subjects: subject: General Physics (physics.gen-ph)
subject: FOS: Physical sciences

description: At high field levels, field emission losses in superconducting cavities have an adverse effect in both reducing the otherwise extremely high Q > 10^9, and the magnetic breakdown field bringing it well below the critical magnetic field of the superconductor. The two effects may well be related as field enhancing whiskers responsible for the field emission losses can be driven normal thus reducing the magnetic breakdown field. Both the beneficial and deleterious effects of anodizing the inner surface of superconducting cavities are discussed and analyzed.
description: 6 pages
On Peres' statement "opposite momenta lead to opposite directions", decaying systems and optical imaging
Creators: name: Struyve, W.
name: De Baere, W.
name: De Neve, J.
name: De Weirdt, S.
Publisher: name: arXiv
Year: 2004
Subjects: subject: Quantum Physics (quant-ph)
subject: FOS: Physical sciences

description: We re-examine Peres' statement ``opposite momenta lead to opposite directions''. It will be shown that Peres' statement is only valid in the large distance or large time limit. In the short distance or short time limit an additional deviation from perfect alignment occurs due to the uncertainty of the location of the source. This error contribution plays a major role in Popper's orginal experimental proposal. Peres' statement applies rather to the phenomenon of optical imaging, which was regarded by him as a verification of his statement. This is because this experiment can in a certain sense be seen as occurring in the large distance limit. We will also reconsider both experiments from the viewpoint of Bohmian mechanics. In Bohmian mechanics particles with exactly opposite momenta will move in opposite directions. In addition it will prove particularly usefull to use Bohmian mechanics because the Bohmian trajectories coincide with the conceptual trajectories drawn by Pittman et al. In this way Bohmian mechanics provides a theoretical basis for these conceptual trajectories.
description: 20 pages, 3 figures, LaTex, to be published in Found. Phys
UBC Food System Project : food waste management : the hot beverage cup
Creators: name: Ching, Vinci
name: Gazzola, Paul
name: Juzkow, Karen
name: Kan, Kenrick
name: Lin, Tina
name: Wark, Caroline
name: Yeung, Eman
Publisher: name: The University of British Columbia
Year: 2014

description: This report aims to evaluate the current practices of waste management at UBC and to focus on the reduction of waste. The disposable hot beverage cup is one major component of the 12 tonnes of waste produced at UBC per day, and it is used to represent UBC’s waste problem. Waste management programs like “WasteFree UBC” have been implemented to encourage consumers to reduce the amount of waste produced. A survey was conducted by our group to determine trends associated with the purchase of hot beverages. To measure the sustainability of waste management, measurable ecological, social, and economic indicators have been developed. Based upon the results of our survey and research, we have included recommendations and research alternatives for the future regarding waste management at UBC. Disclaimer: “UBC SEEDS provides students with the opportunity to share the findings of their studies, as well as their opinions, conclusions and recommendations with the UBC community. The reader should bear in mind that this is a student project/report and is not an official document of UBC. Furthermore readers should bear in mind that these reports may not reflect the current status of activities at UBC. We urge you to contact the research persons mentioned in a report or the SEEDS Coordinator about the current status of the subject matter of a project/report.”
Quantum Critical Behavior and Possible Triplet Superconductivity in Electron Doped CoO2 Sheets
Creators: name: Singh, D. J.
Publisher: name: arXiv
Year: 2003
Subjects: subject: Superconductivity (cond-mat.supr-con)
subject: FOS: Physical sciences

description: Density functional calculations are used to investigate the doping dependence of the electronic structure and magnetic properties in hexagonal Na$_x$CoO$_2$. The electronic structure is found to be highly two dimensional, even without accounting for the structural changes associated with hydration. At the local spin density approximation level, a weak itinerant ferromagnetic state is predicted for all doping levels in the range $x=0.3$ to $x=0.7$, with competing but weaker itinerant antiferromagnetic solutions. The Fermi surface, as expected, consists of simple rounded hexagonal cylinders, with additional small pockets depending on the $c$ lattice parameter. Comparison with experiment implies substantial magnetic quantum fluctuations. Based on the Fermi surface size and the ferromagnetic tendency of this material,it is speculated that a triplet superconducting state analogous to that in Sr$_2$RuO$_4$ may exist here.
description: 4 pages, 1 figure
Continuous-discrete entanglement : An example with non-relativistic particles
Creators: name: Harshman, Nathan
Publisher: name: American University (Washington, D.C.)
Year: 2023
Subjects: classificationCode: 51
subject: Physical sciences
subject: FOS: Physical sciences

description: This article discusses entanglement between two subsystems, one with discrete degrees of freedom and the other with continuous degrees of free- dom. The overlap integral between continuous variable wave functions emerges as an important parameter to characterize this kind entangle- ment. “Beam-like” entanglement and “shape-like” entanglement are con- trasted. One example of this kind of entanglement is between between the spin degrees of freedom and the momentum degrees of freedom for a non-relativistic particle. This intraparticle entanglement is Galilean in- variant.
Skyrmionic chains and lattices in $s+id$ superconductors
Creators: name: Zhang, Ling-Feng
name: Zhang, Yan-Yan
name: Zha, Guo-Qiao
name: Milošević, M. V.
name: Zhou, Shi-Ping
Publisher: name: arXiv
Year: 2020
Subjects: subject: Superconductivity (cond-mat.supr-con)
subject: FOS: Physical sciences

description: We report characteristic vortex configurations in $s+id$ superconductors with time reversal symmetry breaking, exposed to magnetic field. A vortex in the $s+id$ state tends to have an opposite phase winding between $s-$ and $d-$wave condensates. We find that this peculiar feature together with the competition between $s-$ and $d-$wave symmetry results in three distinct classes of vortical configurations. When either $s-$ or $d-$ condensate absolutely dominates, vortices form a conventional lattice. However, when one condensate is relatively dominant, vortices organize in chains that exhibit skyrmionic character, separating the chiral components of the $s \pm id$ order parameter into domains within and outside the chain. Such skyrmionic chains are found stable even at high magnetic field. When $s-$ and $d-$ condensates have a comparable strength, vortices split cores in two chiral components to form full-fledged skyrmions, i.e. coreless topological structures with an integer topological charge, organized in a lattice. We provide characteristic magnetic field distributions of all states, enabling their identification in e.g. scanning Hall probe and scanning SQUID experiments. These unique vortex states are relevant for high-T$_c$ cuprate and iron-based superconductors, where the relative strength of competing pairing symmetries is expected to be tuned by temperature and/or doping level, and can help distinguish $s+is$ and $s+id$ superconducting phases.
description: 13 pages, 7 figures
Entanglement in Massive Coupled Oscillators
Creators: name: Harshman, Nathan
name: Flynn, W.F.
Publisher: name: American University
Year: 2023

description: This article investigates entanglement of the motional states of massive coupled oscillators. The specific realization of an idealized diatomic molecule in onedimension is considered, but the techniques developed apply to any massive particles with two degrees of freedom and a quadratic Hamiltonian. We present two methods, one analytic and one approximate, to calculate the interatomic entanglement for Gaussian and non-Gaussian pure states as measured by the purity of the reduced density matrix. The cases of free and trapped molecules and hetero- and homonuclear molecules are treated. In general, when the trap frequency and the molecular frequency are very different, and when the atomic masses are equal, the atoms are highlyentangled for molecular coherent states and number states. Surprisingly, while the interatomic entanglement can be quite large even for molecular coherent states, the covariance of atomic position and momentum observables can be entirely explained by a classical model with appropriately chosen statistical uncertainty.
Entanglement in Massive Coupled Oscillators
Creators: name: Harshman, Nathan
name: Flynn, W.F.
Publisher: name: American University (Washington, D.C.)
Year: 2023
Subjects: classificationCode: 51
subject: Physical sciences
subject: FOS: Physical sciences

description: This article investigates entanglement of the motional states of massive coupled oscillators. The specific realization of an idealized diatomic molecule in onedimension is considered, but the techniques developed apply to any massive particles with two degrees of freedom and a quadratic Hamiltonian. We present two methods, one analytic and one approximate, to calculate the interatomic entanglement for Gaussian and non-Gaussian pure states as measured by the purity of the reduced density matrix. The cases of free and trapped molecules and hetero- and homonuclear molecules are treated. In general, when the trap frequency and the molecular frequency are very different, and when the atomic masses are equal, the atoms are highlyentangled for molecular coherent states and number states. Surprisingly, while the interatomic entanglement can be quite large even for molecular coherent states, the covariance of atomic position and momentum observables can be entirely explained by a classical model with appropriately chosen statistical uncertainty.
Statistics of cluster multiplicity and the nature of UHE cosmic ray sources
Creators: name: Harari, Diego
name: Mollerach, Silvia
name: Roulet, Esteban
Publisher: name: arXiv
Year: 2004
Subjects: subject: Astrophysics (astro-ph)
subject: High Energy Physics - Phenomenology (hep-ph)
subject: FOS: Physical sciences

description: We study in detail the properties of clusters of ultra high energy cosmic ray events, looking in particular to their angular correlation function, to the relative frequency of clusters with different multiplicities (e.g. doublets vs. triplets or quadruplets), as well as the way in which these quantities should evolve for different ultra high energy cosmic rays source scenarios as a function of the experimental exposure achieved. We identify some useful tools which can help to characterise the nature of the cosmic ray sources in a more precise way after a modest increase in statistics will be achieved in the very near future, even before strong signals from individual sources become eventually observable.
description: 19 pp, 6 ps figures
Toward Efficient Quantum Key Distribution Reconciliation
Creators: name: Benletaief, Nedra
name: Rezig, Houria
name: Bouallegue, Ammar
Publisher: name: arXiv
Year: 2020
Subjects: subject: Cryptography and Security (cs.CR)
subject: FOS: Computer and information sciences

description: In this paper, we propose how to construct a reconciliation method for the BB84 Quantum Key Distribution (QKD) protocol. Theoretically, it is unconditionally secure because it is based on the quantum laws of physics, rather than the assumed computational complexity of mathematical problems. BB84 protocol performances can be reduced by various errors and information leakages such as limited intrinsic efficiency of the protocol, imperfect devices and eavesdropping. The proposed reconciliation method allowed to weed out these errors by using Turbo codes. Since their high error correction capability implies getting low errors, this method has high performance especially when compared to the last method presented in the literature based on Low- Density Parity Check codes (LDPC). In particular, we demonstrate that our method leads to a significant improvement of the protocol security and of the Bit Error Rate (BER) even with great eavesdropping capability.
description: 12 pages, 9 figures, journal
Determination of the Central Mass in Active Galactic Nuclei Using Cross-Correlation Lags and Velocity Dispersions
Creators: name: Fromerth, Michael J.
name: Melia, Fulvio
Publisher: name: arXiv
Year: 2003
Subjects: subject: Astrophysics (astro-ph)
subject: FOS: Physical sciences

description: We here estimate the mass M of the central object in five active galactic nuclei (AGNs), using the most recent reverberation data obtained by the AGN Watch Consortium. The cross-correlation function (CCF) centroids of the broad Ly-alpha 1216 and C IV 1549 lines are used to estimate the size of the broad-line region (BLR) in these sources. We calculate the velocity dispersions of these lines in the root mean square (rms) spectra and then use our results to estimate M. We argue that our technique of calculating the velocity dispersion should work in the general case of an arbitrary line profile, unlike methods that depend on the measurement of the full-width at half-maximum (FWHM) of the broad line. We also show that our results agree with the FWHM method in the limit of a normal (Gaussian) line profile. The masses calculated here are considerably smaller than those calculated with the previous generation of reverberation data.
description: 13 pages, 2 figures
Energy Efficiency Optimization for Downlink Massive MIMO With Statistical CSIT
Creators: name: You, Li
name: Xiong, Jiayuan
name: Yi, Xinping
name: Wang, Jue
name: Wang, Wenjin
name: Gao, Xiqi
Publisher: name: arXiv
Year: 2020
Subjects: subject: Information Theory (cs.IT)
subject: Signal Processing (eess.SP)
subject: FOS: Computer and information sciences
subject: FOS: Electrical engineering, electronic engineering, information engineering

description: We investigate energy efficiency (EE) optimization for single-cell massive multiple-input multiple-output (MIMO) downlink transmission with only statistical channel state information (CSI) available at the base station. We first show that beam domain transmission is favorable for energy efficiency in the massive MIMO downlink, by deriving a closed-form solution for the eigenvectors of the optimal transmit covariance matrix. With this conclusion, the EE optimization problem is reduced to a real-valued power allocation problem, which is much easier to tackle than the original large-dimensional complex matrix-valued precoding design problem. We further propose an iterative water-filling-structured beam domain power allocation algorithm with low complexity and guaranteed convergence, exploiting the techniques from sequential optimization, fractional optimization, and random matrix theory. Numerical results demonstrate the near-optimal performance of our proposed statistical CSI aided EE optimization approach.
description: 32 pages, 6 figures. Accepted for publication in the IEEE Transactions on Wireless Communications
Modulation instability in the nonlinear Schrödinger equation with a synthetic magnetic field: gauge matters
Creators: name: Lelas, Karlo
name: Čelan, Ozana
name: Prelogović, David
name: Buljan, Hrvoje
name: Jukić, Dario
Publisher: name: arXiv
Year: 2020
Subjects: subject: Quantum Gases (cond-mat.quant-gas)
subject: Optics (physics.optics)
subject: FOS: Physical sciences

description: We theoretically investigate the phenomenon of modulation instability for systems obeying nonlinear Schrödinger equation, which are under the influence of an external homogeneous synthetic magnetic field. For an initial condition, the instability is detected numerically by comparing dynamics with and without a small initial perturbation; the perturbations are characterized in a standard fashion by wavevectors in momentum space. We demonstrate that the region of (in)stability in momentum space, as well as time-evolution in real space, for identical initial conditions, depend on the choice of the gauge (i.e., vector potential) used to describe the homogeneous synthetic magnetic field. This superficially appears as if the gauge invariance is broken, but this is not true. When the system is evolved from an identical initial condition in two different gauges, it is equivalent to suddenly turning on the synthetic magnetic field at $t=0$. This gives rise, via Faraday's law, to an initial instantaneous kick of a synthetic electric field to the wavepacket, which can differ for gauges yielding an identical uniform magnetic field at $t>0$.
Observables can be tailored to make any pure state entangled (or not)
Creators: name: Harshman, Nathan
name: Ranade, Kedar S.
Publisher: name: American University
Year: 2023

description: We show that for a finite-dimensional Hilbert space, there exist observables that induce a tensor product structure such that the entanglement properties of any pure state can be tailored. In particular, we provide an explicit, finite method for constructing observables in an unstructured d-dimensional system so that an arbitrary known pure state has any Schmidt decomposition with respect to an induced bipartite tensor product structure. In effect, this article demonstrates that in a finite-dimensional Hilbert space, entanglement properties can always be shifted from the state to the observables and all pure states are equivalent as entanglement resources in the ideal case of complete control of observables.
title: An analysis of factors influencing the growth of photovoltaics in Germany, and the outlook to 2020
Creators: name: Plater, Stephen James
Publisher: name: The Open University
Year: 2011

description: The research investigated drivers of adoption of solar photovoltaic (PV) systems in Germany, questioning the recurrent simple linkage of PV growth with "generous subsidies". It tested the hypothesis that feed-in tariffs are an enabler, not merely a financial impetus, promoting installation of PV not by making it lucratively profitable, but financeable for people who want it for other reasons. The primary focus was on household PV systems. Potential drivers of PV adoption examined include environment consciousness, desire for independence from large utilities, and social influence. Literature review encompasses PV support-demand linkage, policy, attitudes to PV, and relevance of e. g. innovation diffusion theory and intertemporal decisionmaking. The hypothesis was tested by conducting a recent online survey in Germany (400 responses); and comparison of PV capacity installed against expected return on investment (Rol), modelled using an original dataset based on over 1200 "Solar League" towns. Several findings support the hypothesis. Survey respondents rated financeability significantly more important than profitability as reason for wanting PV; climate concern also rated highly. Having children correlates with desire for PV. Much PV capacity has been installed where expected Rol is comparable to risk-free savings account rates; recent household systems growth has not tracked higher Rol. The policy outlook regarding PV support is uncertain: the new government since 2009 has cut feed-in tariffs sharply, and plans extended nuclear plant operating lifetimes. Potential electoral cost may restrain further measures. Capacity growth in Germany continued, 7400MWp (forecast) in 2010, and much potential remains including for household systems. Industry efforts, technological developments, and increasing production scale as new marketsemerge (e. g. USA, China, Italy) continue to push down costs. Some thoughts are offered on what achievement of "grid parity" may mean. The outlook in Germany is for substantial steady annual PV growth of 3-5GWp. Globally, PV seems now unstoppable/
Observables can be tailored to make any pure state entangled (or not)
Creators: name: Harshman, Nathan
name: Ranade, Kedar S.
Publisher: name: American University (Washington, D.C.)
Year: 2023
Subjects: classificationCode: 51
subject: Physical sciences
subject: FOS: Physical sciences

description: We show that for a finite-dimensional Hilbert space, there exist observables that induce a tensor product structure such that the entanglement properties of any pure state can be tailored. In particular, we provide an explicit, finite method for constructing observables in an unstructured d-dimensional system so that an arbitrary known pure state has any Schmidt decomposition with respect to an induced bipartite tensor product structure. In effect, this article demonstrates that in a finite-dimensional Hilbert space, entanglement properties can always be shifted from the state to the observables and all pure states are equivalent as entanglement resources in the ideal case of complete control of observables.
Holography and the Shannon's First Theorem
Creators: name: Correa-Borbonet, L. Alejandro
Publisher: name: arXiv
Year: 2004
Subjects: subject: High Energy Physics - Theory (hep-th)
subject: Quantum Physics (quant-ph)
subject: FOS: Physical sciences

description: A possible link between Holography and Information Theory is presented. Using the relation between the Shannon and Boltzmann formulas Holography can be seen as the best encoding scheme.
description: 9 pages
Performance analysis of Volna-OP2 -- massively parallel code for tsunami modelling
Creators: name: Giles, Daniel
name: Kashdan, Eugene
name: Salmanidou, Dimitra M.
name: Guillas, Serge
name: Dias, Frédéric
Publisher: name: arXiv
Year: 2020
Subjects: subject: Computational Physics (physics.comp-ph)
subject: Numerical Analysis (math.NA)
subject: Atmospheric and Oceanic Physics (physics.ao-ph)
subject: FOS: Physical sciences
subject: FOS: Mathematics

description: The software package Volna-OP2 is a robust and efficient code capable of simulating the complete life cycle of a tsunami whilst harnessing the latest High Performance Computing (HPC) architectures. In this paper, a comprehensive error analysis and scalability study of the GPU version of the code is presented. A novel decomposition of the numerical errors into the dispersion and dissipation components is explored. Most tsunami codes exhibit amplitude smearing and/or phase lagging/leading, so the decomposition shown here is a new approach and novel tool for explaining these occurrences. It is the first time that the errors of a tsunami code have been assessed in this manner. To date, Volna-OP2 has been widely used by the tsunami modelling community. In particular its computational efficiency has allowed various sensitivity analyses and uncertainty quantification studies. Due to the number of simulations required, there is always a trade-off between accuracy and runtime when carrying out these statistical studies. The analysis presented in this paper will guide the user towards an acceptable level of accuracy within a given runtime.
Determinants of money demand for India in presence of structural break: An empirical analysis
Creators: name: Aggarwal, Sakshi
name: Aggarwal, Sakshi
Publisher: name: Unknown
Year: 2016
Subjects: subject: Demand and Price Analysis
subject: Financial Economics
subject: Demand for money
subject: monetary policy
subject: cointegration

description: This paper empirically analyses India’s money demand function during the period 1996 to 2013 using quarterly data. Cointegration test suggests that money demand represented by M1 and Interest Rate have a unit root, whereas in the presence of structural break both of the variables are found to be stationary which implies that shocks are temporary in nature. It was found that there is no long term equilibrium relationship in the money demand function. Moreover, when the money demand function was estimated using dynamic OLS, it is concluded that GDP and short term interest rate has a positive impact on money demand (M1).
Kemeny, G., 2010. Büntető eljárásjogunk tanúvédelemmel kapcsolatos módosításai, a bennük rejlő lehetőségek tükrében. Belügyi szemle 48(10), pp.85-99.
Creators: name: Kemeny, Gabor
Publisher: name: figshare
Year: 2020
Subjects: subject: 180110 Criminal Law and Procedure
subject: FOS: Law

description: The article introduces the current legislation of witness protection and elaborates the possible way forward.
Sustainability DeBETAbility : is the Beta House ecologically sustainable?
Creators: name: Cheung, Ada
name: Cheung, Candy
name: Dilgir, Sapna
name: Parsons, Dallas
name: Robertson, Jessica
name: Wong, Joyce
Publisher: name: The University of British Columbia
Year: 2014

description: Within the context of the UBC food system, we examined the ecological sustainability of the fraternity house, Beta Theta Pi House (Beta House). We began by defining the elements that an ecologically sustainable dining society must have, and based our research and recommendations on this definition. To gather data, an interview with the chef and the house manager was conducted at the Beta House on March 21, 2002. We found that the Beta House members do not compost, or recycle kitchen waste, and that the chef does not regularly buy organic or local food products. Our recommendations offer simple and economically efficient ways for the residents to improve the ecological sustainability of their residence. Disclaimer: “UBC SEEDS provides students with the opportunity to share the findings of their studies, as well as their opinions, conclusions and recommendations with the UBC community. The reader should bear in mind that this is a student project/report and is not an official document of UBC. Furthermore readers should bear in mind that these reports may not reflect the current status of activities at UBC. We urge you to contact the research persons mentioned in a report or the SEEDS Coordinator about the current status of the subject matter of a project/report.”
Three-flavour oscillations with accelerator neutrino beams
Creators: name: Mezzetto, M.
name: Terranova, F.
Publisher: name: arXiv
Year: 2020
Subjects: subject: High Energy Physics - Experiment (hep-ex)
subject: High Energy Physics - Phenomenology (hep-ph)
subject: Accelerator Physics (physics.acc-ph)
subject: Instrumentation and Detectors (physics.ins-det)
subject: FOS: Physical sciences

description: The three-flavor neutrino oscillation paradigm is well established in particle physics thanks to the crucial contribution of accelerator neutrino beam experiments. In this paper we review the most important contributions of these experiments to the physics of massive neutrinos after the discovery of $θ_{13}$ and future perspectives in such a lively field of research. Special emphasis is given to the technical challenges of high power beams and the oscillation results of T2K, OPERA, ICARUS and NO$ν$A. We discuss in details the role of accelerator neutrino experiments in the precision era of neutrino physics in view of DUNE and Hyper-Kamiokande, the programme of systematic uncertainty reduction and the development of new beam facilities.
description: 31 pages, 12 fugures. To appear in Universe
BREED Based De Novo Hybridization Approach: Generating Novel T790M/C797S-EGFR Tyrosine Kinase Inhibitors to Overcome the Problem of Mutation and Resistance in Non Small Cell Lung Cancer (NSCLC)
Creators: name: Patel, Harun M.
name: Matin Shaikh
name: Iqrar Ahmad
name: Lokwani, Deepak
name: Surana, Sanjay J.
Publisher: name: Taylor & Francis
Year: 2020
Subjects: subject: Biochemistry
subject: Medicine
subject: Microbiology
subject: FOS: Biological sciences
subject: Genetics
subject: Molecular Biology
subject: Pharmacology
subject: Biotechnology
subject: 39999 Chemical Sciences not elsewhere classified
subject: FOS: Chemical sciences
subject: Ecology
subject: 69999 Biological Sciences not elsewhere classified
subject: Developmental Biology
subject: Cancer
subject: 110309 Infectious Diseases
subject: FOS: Health sciences
subject: Plant Biology
subject: 60506 Virology

description: Third generation EGFR inhibitor osimertinib was approved as the first-line treatment for EGFR T790M mutation-positive Non-Small Cell Lung Cancer (NSCLC) patients in 2017. However, EGFR tertiary Cys797 to Ser797 (C797S) point mutation emanate rapidly after treatment of osimertinib, which is undruggable mutation to the all existing drugs. In this work, we have reported the novel T790M/C797S-EGFR Tyrosine Kinase inhibitors using BREED based de novo hybridization approach. BREED generates novel inhibitors from structures of known ligands bound to a common target. Among the generated hybridised breed compounds, the top best scorer breed molecules were breed 436, breed 530, breed 450, breed 562 and breed 313. Molecular Dynamics simulation of breed 436 for 10 ns further suggested that docked compound was stable into the pocket of the T790M/C797S-EGFR Tyrosine Kinase. In silico pharmacokinetic predictions of the breed hybridised compounds were within the defined range described for human use.
Radiation Efficiency Limits in Direct Antenna Modulation Transmitters
Creators: name: Schab, Kurt
Publisher: name: arXiv
Year: 2020
Subjects: subject: Applied Physics (physics.app-ph)
subject: FOS: Physical sciences

description: Relative bounds on radiation efficiency are established for time-modulated antenna systems where radiation is generated by broadband conduction currents impressed using idealized non-radiating time-varying subsystems, such as those found in direct antenna modulation (DAM) transmitters. Analytical and numerical examples demonstrate that the condition of quasi-resonance, common in nearly all practical direct antenna modulation transmitters, imposes severe restrictions on the otherwise unbounded gains in effective efficiency theoretically achievable by this class of time-modulated transmitters.
description: 5 pages, 6 figures
Measurements of the f-Values of the Resonance Transitions of Ni II at 1317.217A and 1370.132A
Creators: name: Jenkins, Edward B.
name: Tripp, Todd M.
Publisher: name: arXiv
Year: 2005
Subjects: subject: Astrophysics (astro-ph)
subject: FOS: Physical sciences

description: We have retrieved high-resolution UV spectra of 69 hot stars from the HST archive and determined the strengths of the interstellar Ni II absorption features at 1317.217A. We then compared them to absorptions from either the transitions at 1741.553A (covered in the spectra of 21 of the stars) or the one at 1370.132A (seen for the remaining 48 stars). All spectra were recorded by the either the E140M, E140H, or E230H gratings of STIS. By comparing the strengths of the two lines in each spectrum and evaluating a weighted average of all such comparisons, we have found that the f-value of the 1317A line is 1.34 +/-0.019 times the one at 1741A and 0.971 +/-0.014 times that of the one at 1370A. We adopt as a comparison standard an experimentally determined f-value for the 1741A line (known to 10% accuracy), so that f(1317A) = 0.0571 +/-0.006. It follows from this f-value and our measured line-strength ratios that f(1370A) = 0.0588 +/-0.006. As an exercise to validate our methodology, we compared the 1317A transition to another Ni II line at 1454.842A and arrived at an f-value for the latter that is consistent with a previously measured experimental value to within the expected error.
description: 14 pages, 4 figures, accepted for publication in the Astrophysical Journal
Factors Influencing Attrition Rate among Online Adult Learners: A Guide to Counselling Services for Adult Learners in Open and Distance Learning (ODL) Institution
Creators: name: Mohamed, Noor Hassline
Publisher: name: figshare
Year: 2020
Subjects: subject: Developmental and Educational Psychology
subject: 130101 Continuing and Community Education
subject: FOS: Educational sciences
subject: 130103 Higher Education

description: This study examined factors affecting the attrition rate among online adult learners in Open and Distance Learning (ODL) institution. The focus of the study is to explore what factors cause attrition, and what are the best ways or strategies to prevent attrition rate among online adult learners. There were 80 adult learners from different faculties at Open University Malaysia (OUM) were taken from population of dormant learners which were not registered for two concurrent semesters. The study found that the top three factors of attrition was learners had not prepared academically, online format is not what as they expected, and learners failed to become engaged in their learning. The top three ways to prevent attrition among learners were learners’ communication, learners’ mentoring, and learners’ awareness. It is recommended that the best practice for prevention learners’ attrition was learner itself. Thus, counsellors can alert adult learners to these issues as they enter the ODL institutions. This study offered two beneficial aspects, factors affecting the attrition rate among online adult learners and offered some ways in preventing attrition among online adult learners from learners’ own perspective. Therefore, this study can serve as guide to counselling services for adult learners in open and distance learning institutions.
Fonsechellus fragilis Seevers 1957
Creators: name: Zilberman, Bruno
name: Fontes, Luiz Roberto
Publisher: name: Zenodo
Year: 2020
Subjects: Biodiversity
Taxonomy
Animalia
Arthropoda
Insecta
Coleoptera
Staphylinidae
Fonsechellus
Fonsechellus fragilis

description: Fonsechellus fragilis Seevers (Figs. 1-24, 64, 67, 68, 73-77)
 Fonsechellus fragilis Seevers, 1957: 131.
 Material examined: BRAZIL. Santa Catarina: Itapema, 21.vii.1978, Renato L. de Araujo & Luiz R. Fontes col., 7 specimens (2 dissected on slides) (MZSP 21165) (with Subulitermes sp., MZSP 7683).
 Type locality: BRAZIL. Santa Catarina: Blumenau.
description: Published as part of Zilberman, Bruno & Fontes, Luiz Roberto, 2020, New species and morphological notes on the termitophilous genera Fonsechellus Silvestri and Oecidiophilus Silvestri from Brazil (Staphylinidae, Aleocharinae, Corotocini, Termitoceina), pp. 1-13 in Papéis Avulsos de Zoologia (Pap. Avulsos Zool., S. Paulo) (Pap. Avulsos Zool., S. Paulo) 60 (21) on page 4, DOI: 10.11606/1807-0205/2020.60.special-issue.21, http://zenodo.org/record/4615191
Quantum Corrals, Eigenmodes and Quantum Mirages in s-wave Superconductors
Creators: name: Morr, Dirk K.
name: Stavropoulos, Nikolaos A.
Publisher: name: arXiv
Year: 2003
Subjects: subject: Strongly Correlated Electrons (cond-mat.str-el)
subject: Superconductivity (cond-mat.supr-con)
subject: FOS: Physical sciences

description: We study the electronic structure of magnetic and non-magnetic quantum corrals embedded in s-wave superconductors. We demonstrate that a quantum mirage of an impurity bound state peak can be projected from the occupied into the empty focus of a non-magnetic quantum corral via the excitation of the corral's eigenmodes. We observe an enhanced coupling between magnetic impurities inside the corral, which can be varied through oscillations in the corral's impurity potential. Finally, we discuss the form of eigenmodes in magnetic quantum corrals.
description: 4 pages, 4 figures
Effective dynamics for a spin-1/2 particle constrained to a space curve in an electric and magnetic field
Creators: name: Liang, Guo-Hua
name: Wang, Yong-Long
name: Lai, Meng-Yun
name: Zhao, Hao
name: Zong, Hong-Shi
name: Liu, Hui
Publisher: name: arXiv
Year: 2020
Subjects: subject: Mesoscale and Nanoscale Physics (cond-mat.mes-hall)
subject: Quantum Physics (quant-ph)
subject: FOS: Physical sciences

description: We consider the dynamics of a spin-1/2 particle constrained to move in an arbitrary space curve with an external electric and magnetic field applied. With the aid of gauge theory, we successfully decouple the tangential and normal dynamics and derive the effective Hamiltonian. A new type of quantum potential called SU(2) Zeeman interaction appears, which is induced by the electric field and couples spin and intrinsic orbital angular momentum. Based on the Hamiltonian, we discuss the spin precession for zero intrinsic orbital angular momentum case and the energy splitting caused by the SU(2) Zeeman interaction for a helix as examples, showing the combined effect of geometry and external field. The new interaction may bring new approaches to manipulate quantum states in spintronics.
Commodity chain analysis of the UBC cinnamon bun
Creators: name: Cheung, Emily
name: Gamel, Jennifer
name: Idle, Suzanne
name: Leung, Janey
name: Richter, Alison
name: Tedyatmadjaya, Yuliana
name: Vivier, Holly
Publisher: name: The University of British Columbia
Year: 2014

description: This paper is an assessment of the sustainability of the UBC cinnamon bun. A commodity chain analysis was used to trace the production process of the major ingredients in the bun from the point of origin to the point of consumption. The commodity chain analysis was then used as an indicator of sustainability to assess whether the UBC cinnamon bun is ecologically, economically and socially sustainable. Recommendations are suggested for the UBC campus sustainability office to improve the sustainability of the UBC food system and questions are provided for future investigation. Disclaimer: “UBC SEEDS provides students with the opportunity to share the findings of their studies, as well as their opinions, conclusions and recommendations with the UBC community. The reader should bear in mind that this is a student project/report and is not an official document of UBC. Furthermore readers should bear in mind that these reports may not reflect the current status of activities at UBC. We urge you to contact the research persons mentioned in a report or the SEEDS Coordinator about the current status of the subject matter of a project/report.”
X-ray Variability of the Magnetic Cataclysmic Variable V1432 Aql and the Seyfert Galaxy NGC 6814
Creators: name: Mukai, K.
name: Hellier, C.
name: Madejski, G.
name: Patteson, J.
name: Skillman, D. R.
Publisher: name: arXiv
Year: 2003
Subjects: subject: Astrophysics (astro-ph)
subject: FOS: Physical sciences

description: V1432 Aquilae (=RX J1940.2-1025) is the X-ray bright, eclipsing magnetic cataclysmic variable ~37' away from the Seyfert galaxy, NGC 6814. Due to a 0.3% difference between the orbital (12116.3 s) and the spin (12150 s) periods, the accretion geometry changes over the ~50 day beat period. Here we report the results of an RXTE campaign to observe the eclipse 25 times, as well as of archival observations with ASCA and BeppoSAX. Having confirmed that the eclipse is indeed caused by the secondary, we use the eclipse timings and profiles to map the accretion geometry as a function of the beat phase. We find that the accretion region is compact, and that it moves relative to the center of white dwarf on the beat period. The amplitude of this movement suggest a low-mass white dwarf, in contrast to the high mass previously estimated from its X-ray spectrum. The size of the X-ray emission region appears to be larger than in other eclipsing magnetic CVs. We also report on the RXTE data as well as the long-term behavior of NGC 6814, indicating flux variability by a factor of at least 10 on time scales of years.
description: 44 pages including 16 figures; ApJ, in press
Doppler-Free Two-Photon Cavity Ring-Down Spectroscopy of a Nitrous Oxide (N$_2$O) Vibrational Overtone Transition
Creators: name: Zhao, Gang
name: Bailey, D. Michelle
name: Fleisher, Adam J.
name: Hodges, Joseph T.
name: Lehmann, Kevin K.
Publisher: name: arXiv
Year: 2020
Subjects: subject: Chemical Physics (physics.chem-ph)
subject: Instrumentation and Detectors (physics.ins-det)
subject: Optics (physics.optics)
subject: FOS: Physical sciences

description: We report Doppler-free two-photon absorption of N$_2$O at $λ$ = 4.53 $μ$m, measured by cavity ring-down spectroscopy. High power was achieved by optical self-locking of a quantum cascade laser to a linear resonator of finesse $F$ = 22730, and accurate laser detuning over a 400 MHz range was measured relative to an optical frequency comb. At a sample pressure of p = 0.13 kPa, we report a large two-photon cross-section of $σ_{13}^{(2)}$ = 8.0 $\times$ 10$^{-41}$ cm$^4$ s molecule$^{-1}$ for the $Q$(18) rovibrational transition at a resonant frequency of $ν_0$ = 66179400.8 MHz.
description: 12 pages, 3 figures, 1 table, 38 references
Cognitive abilities and air pollution
Creators: name: Salahodjaev, Raufhon
name: Yuldashev, Oybek
name: Omanbayev, Bekhzod
name: Salahodjaev, Raufhon
name: Yuldashev, Oybek
name: Omanbayev, Bekhzod
Publisher: name: Unknown
Year: 2016
Subjects: subject: Environmental Economics and Policy
subject: Research and Development/Tech Change/Emerging Technologies
subject: Intelligence
subject: air pollution

description: The link between intelligence and air pollution is subject to controversy. Some studies report that intelligence has insignificant effect in reducing the greenhouse gas emissions. By using carbon dioxide (CO2) emissions for a large set of countries we present further novel empirical evidence on the relation between level of intelligence and air pollution. Our findings suggest that the relation follows a U-shape pattern and resembles environmental Kuznets curve.
Men Scare Me More: Gender Differences in Social Fear Conditioning in Virtual Reality
Creators: name: Reichenberger, Jonas
name: Pfaller, Michael
name: Forster, Diana
name: Gerczuk, Jennifer
name: Shiban, Youssef
name: Mühlberger, Andreas
Publisher: name: Universität Regensburg
Year: 2019
Subjects: subject: social anxiety disorder, social fear conditioning, virtual reality, fear ratings, fear-potentiated startle, avoidance behavior, recognition
subject: 150 Psychologie

description: Women nearly twice as often develop social anxiety disorder (SAD) compared to men. The reason for this difference is still being debated. The present study investigates gender differences and the effect of male versus female agents in low (LSA) and high socially anxious (HSA) participants regarding the acquisition and extinction of social fear in virtual reality (VR). In a social fear conditioning (SFC) paradigm, 60 participants actively approached several agents, some of which were paired with an aversive unconditioned stimulus (US) consisting of a verbal rejection and spitting simulated by an aversive air blast (CS+), or without an US (CS−). Primary outcome variables were defined for each of the 4 levels of emotional reactions including experience (fear ratings), psychophysiology (fear-potentiated startle), behavior (avoidance), and cognition (recognition task). Secondary outcome variables were personality traits, contingency ratings, heart rate (HR), and skin conductance response (SCR). As hypothesized, fear ratings for CS+ increased significantly during acquisition and the differentiation between CS+ and CS− vanished during extinction. Additionally, women reported higher fear compared to men. Furthermore, a clear difference in the fear-potentiated startle response between male CS+ and CS− at the end of acquisition indicates successful SFC to male agents in both groups. Concerning behavior, results exhibited successful SFC in both groups and a general larger distance to agents in HSA than LSA participants. Furthermore, HSA women maintained a larger distance to male compared to female agents. No such differences were found for HSA men. Regarding recognition, participants responded with higher sensitivity to agent than object stimuli, suggesting a higher ability to distinguish the target from the distractor for social cues, which were on focus during SFC. Regarding the secondary physiological outcome variables, we detected an activation in HR response during acquisition, but there were no differences between stimuli or groups. Moreover, we observed a gender but no CS+/CS− differences in SCR. SFC was successfully induced and extinguished according to the primary outcome variables. VR is an interesting tool to measure emotional learning processes on different outcome levels with enhanced ecological validity. Future research should further investigate social fear learning mechanisms for developing more efficient treatments of SAD.