cometadata/datacite-rtg-text-other-reclassification-records huggingface dataset:
Real Time Models of the Asynchronous Circuits: The Delay Theory
Creators: name: Vlad, Serban E.
Publisher: name: arXiv
Year: 2004
Subjects: subject: General Literature (cs.GL)
subject: FOS: Computer and information sciences

description: The chapter from the book introduces the delay theory, whose purpose is the modeling of the asynchronous circuits from digital electrical engineering with ordinary and differential pseudo-boolean equations.
description: 82 pages, 30 figures
Organic supply chain collaboration: a case study in eight EU Countries
Creators: name: Naspetti, Simona
name: Lampkin, Nicolas
name: Nicolas, P.
name: Stolze, Matthias
name: Zanoli, Raffaele
name: Naspetti, Simona
name: Lampkin, Nicolas
name: Nicolas, P.
name: Stolze, Matthias
name: Zanoli, Raffaele
Publisher: name: Unknown
Year: 2009
Subjects: Agricultural and Food Policy
Food Consumption/Nutrition/Food Safety

description: This study aims at contributing to a better understanding of the linkage between supply chain performance and possible performance improvement with respect to food quality and safety. Therefore, the paper addresses the question whether the level of collaborative planning and close supply chain relationships could help improve quality and safety of organic supply chains. The study was conducted as a part of the multi-disciplinary EU-wide survey of organic supply chains, carried out in 8 European countries. In this paper we report the results of the study regarding the structures and performance of six different organic supply chains in these eight European countries: milk (CH, UK), apples (DE, CH), pork (UK, NL), eggs (DE, UK), wheat (HU, IT, FR) and tomatoes (IT, NL). In depth interviews with key-informants were carried out in 2006 to investigate the structures, performance and relationships within the supply chains. Results show a low level of collaboration among various actors especially on cost and benefits sharing. Highly integrated supply chains show higher collaboration especially in the domain of Decision Synchronization. Trust and collaboration appear to be related with increased performance, while, the higher the perceived risk for quality and safety is, the higher the probability of supply chain collaboration.
A Lightweight Sparse Focus Transformer for Remote Sensing Image Change Captioning
Creators: name: Sun, Dongwei
name: Bao, Yajie
name: Liu, Junmin
name: Cao, Xiangyong
Publisher: name: arXiv
Year: 2024
Subjects: subject: Computer Vision and Pattern Recognition (cs.CV)
subject: FOS: Computer and information sciences

description: Remote sensing image change captioning (RSICC) aims to automatically generate sentences that describe content differences in remote sensing bitemporal images. Recently, attention-based transformers have become a prevalent idea for capturing the features of global change. However, existing transformer-based RSICC methods face challenges, e.g., high parameters and high computational complexity caused by the self-attention operation in the transformer encoder component. To alleviate these issues, this paper proposes a Sparse Focus Transformer (SFT) for the RSICC task. Specifically, the SFT network consists of three main components, i.e. a high-level features extractor based on a convolutional neural network (CNN), a sparse focus attention mechanism-based transformer encoder network designed to locate and capture changing regions in dual-temporal images, and a description decoder that embeds images and words to generate sentences for captioning differences. The proposed SFT network can reduce the parameter number and computational complexity by incorporating a sparse attention mechanism within the transformer encoder network. Experimental results on various datasets demonstrate that even with a reduction of over 90\% in parameters and computational complexity for the transformer encoder, our proposed network can still obtain competitive performance compared to other state-of-the-art RSICC methods. The code is available at \href{https://github.com/sundongwei/SFT_chag2cap}{Lite\_Chag2cap}.
Measuring Volatility in Dairy Commodity Prices
Creators: name: O'Connor, Declan
name: Keane, Michael
name: Barnes, Edel
name: O'Connor, Declan
name: Keane, Michael
name: Barnes, Edel
Publisher: name: Unknown
Year: 2009
Subjects: subject: Agricultural and Food Policy
subject: Food Consumption/Nutrition/Food Safety
subject: Price Volatility
subject: ARMA
subject: GARCH
subject: Butter
subject: SMP
subject: Dairy Policy

description: The policy environment facing the EU dairy industry continues to undergo considerable change under WTO and CAP reform. Movement away from supply management by the EU and a more liberal global agricultural trading system will involve greater price volatility for dairy commodities. It is anticipated that EU dairy prices will more closely align with world prices. World prices are both lower and more volatile than EU prices and it is further assumed that this increased volatility will be transmitted to EU prices. Price volatility is a concern for a number of reasons as it adds challenges for business planning, debt repayment, and, in some cases, solvency. Representative EU and world butter and SMP (Skim Milk Powder) prices are considered and using the ARMA and GARCH framework their volatility is quantified.
Vortices in Atomic Bose-Einstein Condensates in the Large Gas Parameter Region
Creators: name: Nilsen, J. K.
name: Mur-Petit, J.
name: Guilleumas, M.
name: Hjorth-Jensen, M.
name: Polls, A.
Publisher: name: arXiv
Year: 2005
Subjects: subject: Other Condensed Matter (cond-mat.other)
subject: FOS: Physical sciences

description: In this work we compare the results of the Gross-Pitaevskii and modified Gross-Pitaevskii equations with ab initio variational Monte Carlo calculations for Bose-Einstein condensates of atoms in axially symmetric traps. We examine both the ground state and excited states having a vortex line along the z-axis at high values of the gas parameter and demonstrate an excellent agreement between the modified Gross-Pitaevskii and ab initio Monte Carlo methods, both for the ground and vortex states.
description: To appear in Phys Rev A 71
Search for D^0-D^0bar mixing in D^0 -> K+pi- decays and measurement of the doubly-Cabibbo-suppressed decay rate
Creators: name: Li, J.
name: Zhang, Z. P.
name: Schwartz, A. J.
Publisher: name: arXiv
Year: 2004
Subjects: subject: High Energy Physics - Experiment (hep-ex)
subject: FOS: Physical sciences

description: We have searched for mixing in the D0-D0bar system by measuring the decay-time distribution of D0->K+pi- decays. The analysis uses 90 fb^{-1} of data collected by the Belle detector at the KEKB e+e- collider. We fit the decay-time distribution for the mixing parameters x' and y' and also for the parameter R_D, which is the ratio of the rate for the doubly-Cabibbo-suppressed decay D0->K+pi- to that for the Cabibbo-favored decay D0->K-pi+. We do these fits both assuming CP conservation and allowing for CP violation. We use a frequentist method to obtain a 95% C.L. region in the x'^2 - y' plane. Assuming no mixing, we measure R_D = (0.381 \pm 0.017 +0.008 -0.016) %.
description: 9 pages, 3 figures, 1 table, originally submitted to ICHEP2004 (Beijing, China); final version submitted to Physical Review Letters
Raw data
Creators: name: Gou, Qifeng
Publisher: name: figshare
Year: 2021
Subjects: subject: 110601 Biomechanics
subject: FOS: Health sciences

description: The study is “Sports Biomechanics Analysis of Badminton Players' Backcourt Smash“.The mandatory metadata marked with wait for files to upload to be able to make the item public.
Image interpolation with high visual quality
Creators: name: Wang, Qing
Publisher: name: University of British Columbia
Year: 2009

description: Image interpolation or resizing has wide applications in areas such as digital photography, the printing industry, HDTV and computer graphics. The traditional methods for image interpolation are known to suffer from visual artifacts that degrade the subjective quality of images. The goal of this research is to study and develop new image interpolation techniques that provide images with improved visual quality. In our study, we focus on the two most harmful artifacts resulting from traditional image interpolation, zigzagging and blurring. In developing the new interpolation method, we concentrate on visually oriented interpolation techniques. We explore the feature-oriented and content-adaptive approach emerging from recent studies on image interpolation. To find out why and how zigzagging arises, we first study the isophotes, i.e., the equiintensity contours, of interpolated images. Based on this analysis, we design an interpolation scheme that employs interpolation grid that adapt to the orientation of image isophotes. This method yields much smoother isophotes in the interpolated images than the traditional interpolation methods. As a result, the zigzagging artifacts are largely suppressed. To remove the blurring effect, we propose a method of enhancing the contrast of expanded images. To do so, we first discuss the properties an edge-sharpening function should satisfy. From these we choose a family of edge-sharpening functions that have the desired properties. The proposed contrast enhancement method proves to be effective in removing the blur. We also show that evaluations based on the mean squared error (MSE) are not effective, thus we employ and improve the curvature-based measures to evaluate the performance of the proposed interpolation method. The experiments and analysis show that our proposed interpolation method is visually superior to traditional methods, and provide interpolated images with high visual quality.
Dark energy and supermassive black holes
Creators: name: Gonzalez-Diaz, Pedro F.
Publisher: name: arXiv
Year: 2004
Subjects: subject: Astrophysics (astro-ph)
subject: FOS: Physical sciences

description: This paper deals with a cosmological model in which the universe is filled with tachyon dark energy in order to describe current and future accelerating expansion. We obtain that the simplest condition for the regime of phantom energy to occur in this scenario is that the scalar field be Wick rotated to imaginary values which correspond to an axionic field classically. By introducing analytical expressions for the scale factor or the Hubble parameter that satisfy all constraint equations of the used models we show that such models describe universes which may develop a big rip singularity in the finite future. It is argued that, contrary to a recent claim, the entropy for a universe filled with dark energy is definite positive even on the phantom regime where the universe would instead acquire a negative temperature. It is also seen that, whichever the fate of the tachyonic accelerating universe, it will be stable to any fluctuations of the scalar field, and that since the considered models have all an imaginary sound speed, any overdense regions will undergo an accelerate collapse leading rapidly to formation of giant black holes. Finally the conjecture is advanced that these black holes may be the supermassive black holes that most galaxies harbor at their center.
description: 13 pages, RevTex, accepted for publication in Phys. Rev. D
Bistability of Bose-Fermi mixtures
Creators: name: Karpiuk, Tomasz
name: Gajda, Mariusz
name: Brewczyk, Mirosław
Publisher: name: arXiv
Year: 2020
Subjects: subject: Quantum Gases (cond-mat.quant-gas)
subject: Quantum Physics (quant-ph)
subject: FOS: Physical sciences

description: We study the properties of the Bose-Fermi mixture from the perspective of reaching a state of a self-bound quantum droplet. The variational analysis shows that the system exhibits bistability. For weak repulsion between bosons, one of the equilibrium states, smaller in size, spherically symmetric, and with negative energy, corresponds to quantum droplet, the other with always positive energy represents the elongated droplet-like state immersed in the sea of a fermionic cloud. For stronger repulsion between bosons the bifurcation is seized and only the former state is left. Now it represents an elongated object which, for strong enough boson-fermion attraction, gets negative energy. It becomes an excited Bose-Fermi droplet when the trap is released, what is demonstrated by solving the quantum hydrodynamics equations for the Bose-Fermi system. To depict our ideas we consider the $^{133}$Cs-$^6$Li mixture under ideal conditions, i.e. we assume no losses.
description: 6 pages, 5 figures
Internal rotation of subdwarf B stars: limiting cases and asteroseismological consequences
Creators: name: Kawaler, Steven D.
name: Hostler, Shelbi R.
Publisher: name: arXiv
Year: 2004
Subjects: subject: Astrophysics (astro-ph)
subject: FOS: Physical sciences

description: Observations of the rotation rates of horizontal branch (HB) stars show puzzling systematics. In particular, cooler HB stars often show rapid rotation (with velocities in excess of 10 km/s), while hotter HB stars typically show much smaller rotation velocities. Simple models of angular momentum evolution of stars from the main sequence through the red giant branch fail to explain these effects. In general, evolutionary models in all cases preserve a rapidly rotating core. The observed angular velocities of HB stars require that some of the angular momentum stored in the core reaches the surface. To test the idea that HB stars contain such a core, one can appeal to detailed computations of trace element abundences and rotational mixing. However, a more direct probe is available to test these limiting cases of angular momentum evolution. Some of the hottest horizontal branch stars are members of the pulsating sdB class. They frequently show rich pulsation spectra characteristic of nonradially pulsating stars. Thus their pulsations probe the internal rotation of these stars, and should show the effects of rapid rotation in their cores. Using models of sdB stars that include angular momentum evolution, we explore this possibility and show that some of the sdB pulsators may indeed have rapidly rotating cores.
description: accepted for publication in The Astrophysical Journal
Comparison between step strains and slow steady shear in a bubble raft
Creators: name: Twardos, Michael
name: Dennin, Michael
Publisher: name: arXiv
Year: 2004
Subjects: subject: Soft Condensed Matter (cond-mat.soft)
subject: Statistical Mechanics (cond-mat.stat-mech)
subject: FOS: Physical sciences

description: We report on a comparison between stress relaxations after an applied step strain and stress relaxations during slow, continuous strain in a bubble raft. A bubble raft serves as a model two-dimensional foam and consists of a single layer of bubbles on a water surface. For both step strains and continuous strain, one observes periods of stress increase and decrease. Our focus is on the distribution of stress decreases, or stress drops. The work is motivated by apparent disagreements between quasistatic simulations of flowing foam and simulations of continuous strain for foam. Quasistatic simulations have reported larger average stress drops than the continuous strain case. Also, there is evidence in quasistatic simulations for a general divergence of the average size of the stress drops that only appears to occur in steady strain near special values of the foam density. In this work, applied step strains are used as an approximation to quasistatic simulations. We find general agreement in the dependence of the average stress drop on rate of strain, but we do not observe evidence for a divergence of the average stress drop.
Disentangling new physics in $K\rightarrowπ\barνν$ and $B\rightarrow K(K^*)\barνν$ observables
Creators: name: Buras, Andrzej J.
name: Harz, Julia
name: Mojahed, Martin A.
Publisher: name: arXiv
Year: 2024
Subjects: subject: High Energy Physics - Phenomenology (hep-ph)
subject: High Energy Physics - Experiment (hep-ex)
subject: High Energy Physics - Lattice (hep-lat)
subject: FOS: Physical sciences

description: We investigate the possibility of disentangling different new physics contributions to the rare meson decays $K\rightarrowπ+\displaystyle{\not}E$ and $B\rightarrow K(K^*)+\displaystyle{\not}E$ through kinematic distributions in the missing energy $\displaystyle{\not}E$. We employ dimension-$6$ operators within the Low-Energy Effective Field Theory (LEFT), identifying the invisible part of the final state as either active or sterile neutrinos. Special emphasis is given to lepton-number violating (LNV) operators with scalar and tensor currents. We show analytically that contributions from scalar, vector, and tensor quark currents can be uniquely determined from experimental data of kinematic distributions. In addition, we present new correlations of branching ratios for $K$ and $B$-decays involving scalar and tensor currents. As there could a priori also be new invisible particles in the final states, we include dark-sector operators giving rise to two dark scalars, fermions, or vectors in the final state. In this context, we present new calculations of the inclusive decay rate $B\rightarrow X_s+\displaystyle{\not}E$ for dark operators. We show that careful measurements of kinematic distributions make it theoretically possible to disentangle the contribution from LEFT operators from most of the dark-sector operators, even when multiple operators are contributing. We revisit sum rules for vector currents in LEFT and show that the latter are also satisfied in some new dark-physics scenarios that could mimic LEFT. Finally, we point out that an excess in rare meson decays consistent with a LNV hypothesis would point towards highly flavor non-democratic physics in the UV, and could put high-scale leptogenesis under tension.
description: v2: Figures 1 and 2 have been updated to reflect the new NA62 results
Food aid distribution in Bangladesh: leakage and operational performance
Creators: name: Ahmed, Akhter U.
name: Rashid, Shahidur
name: Sharma, Manohar P.
name: Zohir, Sajjad
name: Ahmed, Akhter U.
name: Rashid, Shahidur
name: Sharma, Manohar P.
name: Zohir, Sajjad
Publisher: name: Unknown
Year: 2004
Subjects: subject: Food Security and Poverty
subject: food aid
subject: food distribution
subject: leakage
subject: Bangladesh

description: Donors support a number of targeted food-based programs in Bangladesh that are widely credited with providing poor people access to food and improving their food security. However, inefficiency in the food distribution system may be hindering the realization of the full benefits of these programs. The International Food Policy Research Institute (IFPRI) conducted a comprehensive study of the efficiency of food distribution in food aid-supported programs in Bangladesh. The study has three components: (1) food discharge at harbors, (2) the public food distribution system, and (3) food distribution to program beneficiaries. The capacity and efficiency of the food distribution system was assessed from entry ports to targeted beneficiaries. The study identified problems in the whole food distribution system, determined the level of losses, leakages, and other lapses at various stages, and recommended solutions.
Dr. J. Gordon Melton's 'Resource Guide for the Study of Pentecostalism in Texas': An essential tool for scholars, historians, and students of the Pentecostal movement in the Lone Star State
Creators: name: Barnes, Roscoe
Publisher: name: figshare
Year: 2020
Subjects: subject: 210304 Biography
subject: FOS: History and archaeology
subject: 220401 Christian Studies (incl. Biblical Studies and Church History)
subject: FOS: Philosophy, ethics and religion
subject: 220402 Comparative Religious Studies
subject: Ethnic Studies
subject: History
subject: 220499 Religion and Religious Studies not elsewhere classified
subject: 220405 Religion and Society
subject: Religious Studies

description: This blog post presents a review of Dr. J. Gordon Melton’s Resource Guide for the Study of Pentecostalism in Texas (Institute for Studies of Religion, 2020). The publication is a compilation of vital resources (annotated notes and bibliography) that Melton gathered in his research for "the formal narrative" he is writing about the Pentecostal movement in Texas. He published it with the hope that it might benefit "colleagues who are studying either Pentecostalism in general or Texas religious history." I view this resource as an essential tool for scholars, historians, and students of the Pentecostal movement in the Lone Star State. #FFBosworth
Spin transport in disordered single-wall carbon nanotubes contacted to ferromagnetic leads
Creators: name: Krompiewski, S.
name: Nemec, N.
name: Cuniberti, G.
Publisher: name: arXiv
Year: 2005
Subjects: subject: Mesoscale and Nanoscale Physics (cond-mat.mes-hall)
subject: Materials Science (cond-mat.mtrl-sci)
subject: FOS: Physical sciences

description: Recent conductance measurements on multi-wall carbon nanotubes (CNTs) reveal an effective behavior similar to disordered single-wall CNTs. This is due to the fact that electric current flows essentially through the outermost shell and is strongly influenced by inhomogeneous electrostatic potential coming from the inner tubes. Here, we present theoretical studies of spin-dependent transport through disorder-free double-wall CNTs as well as single-wall CNTs with Anderson-type disorder. The CNTs are end-contacted to ferromagnetic electrodes modelled as fcc (111) surfaces. Our results shed additional light on the giant magnetoresistance effect in CNTs. Some reported results concern realistically long CNTs, up to several hundred nanometers.
description: 9 pages, 5 figures, presented at the European Conference PHYSICS OF MAGNETISM 2005, Poznan, Poland
Husserl: Cientificismo, reducciones y "conciencia purificada". Abordar la polémica husserliana un siglo después
Creators: name: Sandoval, Rodrigo Y.
Publisher: name: figshare
Year: 2020
Subjects: subject: 220210 History of Philosophy
subject: FOS: Philosophy, ethics and religion

description: En atención a las críticas de la autointerpretación teórica heideggeriana, abordaremos tres temas fundamentales posteriores al “giro” trascendental husserliano. A la luz de la interpretación contemporánea, buscaremos evitar los lugares comunes de la crítica a Husserl, en aras de una discusión más sofisticada en torno al método fenomenológico. /// Considering the most extended arguments of Martin Heidegger against the transcendental " turn " of Phenomenology, we will approach to three main characters of this sui generis transcendentalism. In light of contemporary phenomenological studies, we will avoid commonplaces of misinterpretation in order to gain a more sophisticated debate about phenomenological method.
ATB Business Sentiments Index™: Where is the Economy Going? 2010 Quarter 2
Creators: name: Chambers, Edward J.
name: Emter, Nicholas A.
name: Chambers, Edward J.
name: Emter, Nicholas A.
Publisher: name: Unknown
Year: 2010
Subjects: subject: Public Economics
subject: Business Sentiments
subject: Economy Going

description: This quarter’s Business Sentiments Index™ of 141.8 reflects the continued optimism of Alberta entrepreneurs. The substantial increase (8.6%) in the Business Activity Index, standing at 121.0, shows that the Alberta economy is emerging from the economic downturn. This compares with a level of 111.4 last quarter, but is still below pre-recession levels. The Business Hiring Index of 119.2 is a slight improvement over the last quarter, when the index stood at 117.4.
raw data
Creators: name: Gou, Qifeng
Publisher: name: figshare
Year: 2021
Subjects: subject: 110601 Biomechanics
subject: FOS: Health sciences

description: The study is “Sports Biomechanics Analysis of Badminton Players' Backcourt Smash“.The mandatory metadata marked with wait for files to upload to be able to make the item public.
Mass terms in the Skyrme Model
Creators: name: Kopeliovich, V. B.
name: Piette, B.
name: Zakrzewski, W. J.
Publisher: name: arXiv
Year: 2005
Subjects: subject: High Energy Physics - Theory (hep-th)
subject: FOS: Physical sciences

description: We consider various forms of the mass term that can be used in the Skyrme model and their implications on the properties of baryonic states. We show that, with an appropriate choice for the mass term, without changing the asymptotic behaviour of the profile functions at large $r$, we can considerably reduce or increase the mass term's contribution to the classical mass of the solitons. We find that multibaryon configurations can be classically bound at large baryon numbers for some choices of this mass term.
description: 28 pages, 5 figures, 6 tables
Not all interventions are equal for the height of the second peak
Creators: name: Hulshof, Tim
name: Jorritsma, Joost
name: Komjáthy, Júlia
Publisher: name: arXiv
Year: 2020
Subjects: subject: Physics and Society (physics.soc-ph)
subject: Biological Physics (physics.bio-ph)
subject: Populations and Evolution (q-bio.PE)
subject: FOS: Physical sciences
subject: FOS: Biological sciences

description: In this paper we conduct a simulation study of the spread of an epidemic like COVID-19 with temporary immunity on finite spatial and non-spatial network models. In particular, we assume that an epidemic spreads stochastically on a scale-free network and that each infected individual in the network gains a temporary immunity after its infectious period is over. After the temporary immunity period is over, the individual becomes susceptible to the virus again. When the underlying contact network is embedded in Euclidean geometry, we model three different intervention strategies that aim to control the spread of the epidemic: social distancing, restrictions on travel, and restrictions on maximal number of social contacts per node. Our first finding is that on a finite network, a long enough average immunity period leads to extinction of the pandemic after the first peak, analogous to the concept of "herd immunity". For each model, there is a critical average immunity length $L_c$ above which this happens. Our second finding is that all three interventions manage to flatten the first peak (the travel restrictions most efficiently), as well as decrease the critical immunity length $L_c$, but elongate the epidemic. However, when the average immunity length $L$ is shorter than $L_c$, the price for the flattened first peak is often a high second peak: for limiting the maximal number of contacts, the second peak can be as high as 1/3 of the first peak, and twice as high as it would be without intervention. Thirdly, interventions introduce oscillations into the system and the time to reach equilibrium is, for almost all scenarios, much longer. We conclude that network-based epidemic models can show a variety of behaviors that are not captured by the continuous compartmental models.
description: 17 pages text, 27 figures of which 22 in the appendix
Community empowerment and scaling-up in urban areas: The evolution of push/prospect in Zambia
Creators: name: Garrett, James L.
name: Garrett, James L.
Publisher: name: Unknown
Year: 2004
Subjects: subject: Community/Rural/Urban Development
subject: CARE
subject: Poverty alleviation
subject: Community organizations
subject: Urban poor
subject: Peri-urban areas
subject: Urban programming
subject: Empowerment
subject: Community-driven development (CDD)
subject: Food aid
subject: Scaling up
subject: Civil society
subject: Government policy

description: CARE began PROSPECT (Program of Support for Poverty Elimination and Community Transformation) in 1998. PROSPECT aims to reduce poverty in peri-urban areas of Lusaka. It employs a community-based approach to carry out three types of activities: social empowerment (institution building at the local level), personal empowerment (microfinance), and infrastructure improvement (mostly water supply schemes). PROSPECT has attempted to carry out these activities largely through its support of area-based organizations (ABOs) that now form part of city government. The zone development committees (ZDCs) and residents' development committees (RDCs) are the basic components of the ABO structure. These are community-level representations of municipal government; they are the community's mechanisms for expressing its voice and driving development. PROSPECT is itself an extension of an earlier project, PUSH II (Peri-Urban Self- Help Project). PUSH II and PROSPECT are fundamentally about developing community-based and community-driven development (CDD) mechanisms and strengthening community capacities to identify and respond to community needs. The paper examines the scaling-up experience of PUSH II and PROSPECT, looking especially at the mechanisms of CDD, the ABOs.
description: Includes bibliographical references. Urban Challenges to Food and Nutrition Security.
Spin Hall magnetoresistance in Pt/(Ga,Mn)N devices
Creators: name: Mendoza-Rodarte, J. Aaron
name: Gas, Katarzyna
name: Herrera-Zaldívar, Manuel
name: Hommel, Detlef
name: Sawicki, Maciej
name: Guimarães, Marcos H. D.
Publisher: name: arXiv
Year: 2024
Subjects: subject: Mesoscale and Nanoscale Physics (cond-mat.mes-hall)
subject: FOS: Physical sciences

description: Diluted magnetic semiconductors (DMS) have attracted significant attention for their potential in spintronic applications. Particularly, magnetically-doped GaN is highly attractive due to its high relevance for the CMOS industry and the possibility of developing advanced spintronic devices which are fully compatible with the current industrial procedures. Despite this interest, there remains a need to investigate the spintronic parameters that characterize interfaces within these systems. Here, we perform spin Hall magnetoresistance (SMR) measurements to evaluate the spin transfer at a Pt/(Ga,Mn)N interface. We determine the transparency of the interface through the estimation of the real part of the spin mixing conductance finding $G_r = 2.6\times 10^{14} \, Ω^{-1} m^{-2}$, comparable to state-of-the-art yttrium iron garnet (YIG)/Pt interfaces. Moreover, the magnetic ordering probed by SMR above the (Ga,Mn)N Curie temperature TC provides a broader temperature range for the efficient generation and detection of spin currents, relaxing the conditions for this material to be applied in new spintronic devices.
description: 14 pages, 3 main figures
Basins of attraction for cascading maps
Creators: name: Boczko, Erik
name: Young, Todd
Publisher: name: arXiv
Year: 2004
Subjects: subject: Dynamical Systems (math.DS)
subject: Mathematical Physics (math-ph)
subject: FOS: Mathematics
subject: FOS: Physical sciences
subject: 37C35, 37G25

description: We study a finite uni-directional array of "cascading" or "threshold coupled" chaotic maps. Such systems have been proposed for use in nonlinear computing and have been applied to classification problems in bioinformatics. We describe some of the attractors for such systems and prove general results about their basins of attraction. In particular, we show that the basins of attraction have infinitely many path components. We show that these components always accumulate at the corners of the domain of the system. For all threshold parameters above a certain value, we show that they accumulate at a Cantor set in the interior of the domain. For certain ranges of the threshold, we prove that the system has many attractors.
description: 15 pages, 9 figures. To appear in International Journal of Bifurcations and Chaos
Accurately Weighing Neutrinos with Cosmological Surveys
Creators: name: Xu, Weishuang Linda
name: DePorzio, Nicholas
name: Muñoz, Julian B.
name: Dvorkin, Cora
Publisher: name: arXiv
Year: 2020
Subjects: subject: Cosmology and Nongalactic Astrophysics (astro-ph.CO)
subject: High Energy Physics - Phenomenology (hep-ph)
subject: FOS: Physical sciences

description: A promising avenue to measure the total, and potentially individual, mass of neutrinos consists of leveraging cosmological datasets, such as the cosmic microwave background and surveys of the large-scale structure of the universe. In order to obtain unbiased estimates of the neutrino mass, however, many effects ought to be included. Here we forecast, via a Markov Chain Monte Carlo likelihood analysis, whether measurements by two galaxy surveys: DESI and {\it Euclid}, when added to the CMB-S4 experiment, are sensitive to two effects that can alter neutrino-mass measurements. The first is the slight difference in the suppression of matter fluctuations that each neutrino-mass hierarchy generates, at fixed total mass. The second is the growth-induced scale-dependent bias (GISDB) of haloes produced by massive neutrinos. We find that near-future surveys can distinguish hierarchies with the same total mass only at the $1σ$ level; thus, while these are poised to deliver a measurement of the sum of neutrino masses, they cannot significantly discern the mass of each individual neutrino in the foreseeable future. We further find that neglecting the GISDB induces up to a $1σ$ overestimation of the total neutrino mass, and we show how to absorb this effect via a redshift-dependent parametrization of the scale-independent bias.
description: 12 pages, 5 figures. Matches PRD version
Infinite-dimensional stochastic differential equations and tail $ σ$-fields II: the IFC condition
Creators: name: Kawamoto, Yosuke
name: Osada, Hirofumi
name: Tanemura, Hideki
Publisher: name: arXiv
Year: 2020
Subjects: subject: Probability (math.PR)
subject: FOS: Mathematics
subject: Primary 60K35, Secondary 60H10, 82C22, 60B20

description: In a previous report, the second and third authors gave general theorems for unique strong solutions of infinite-dimensional stochastic differential equations (ISDEs) describing the dynamics of infinitely many interacting Brownian particles. One of the critical assumptions is the \lq\lq IFC" condition. The IFC condition requires that, for a given weak solution, the scheme consisting of the finite-dimensional stochastic differential equations (SDEs) related to the ISDEs exists. Furthermore, the IFC condition implies that each finite-dimensional SDE has unique strong solutions. Unlike other assumptions, the IFC condition is challenging to verify, and so the previous report only verified solution for solutions given by quasi-regular Dirichlet forms. In the present paper, we provide a sufficient condition for the IFC requirement in more general situations. In particular, we prove the IFC condition without assuming the quasi-regularity or symmetry of the associated Dirichlet forms. As an application of the theoretical formulation, the results derived in this paper are used to prove the uniqueness of Dirichlet forms and the dynamical universality of random matrices.
description: This paper is a continuation of "Infinite-dimensional stochastic differential equations and tail $\sigma $-fields", which published in Probability Theory and Related Fields, https://doi.org/10.1007/s00440-020-00981-y. This paper will be published in Journal of the Mathematical Society of Japan
V(us) Determination from Hyperon Semileptonic Decays
Creators: name: Mateu, V.
name: Pich, A.
Publisher: name: arXiv
Year: 2005
Subjects: subject: High Energy Physics - Phenomenology (hep-ph)
subject: High Energy Physics - Experiment (hep-ex)
subject: FOS: Physical sciences

description: We analyze the numerical determination of the quark mixing factor V(us) from hyperon semileptonic decays. The discrepancies between the results obtained in two previous studies are clarified. Our fits indicate sizeable SU(3) breaking corrections, which unfortunately can only be fully determined from the data at the first order. The lack of a reliable theoretical calculation of second-order symmetry breaking effects translates into a large systematic uncertainty, which has not been taken into account previously. Our final result, V(us) = 0.226 +/- 0.005, is not competitive with the existing determinations from K(l3), K(l2) and τdecays.
description: 16 pages, no figures. References added and other minor changes
Determination of Out-of-plane Spin Polarization of Topological Surface States by Spin Hall Effect Tunneling Spectroscopy
Creators: name: Götte, Matthias
name: Dahm, Thomas
Publisher: name: arXiv
Year: 2020
Subjects: subject: Mesoscale and Nanoscale Physics (cond-mat.mes-hall)
subject: FOS: Physical sciences

description: Determining the detailed spin texture of topological surface states is important when one wants to apply topological insulators in spintronic devices. In principle, the in-plane spin component of the surface states can be measured by a method analogous to the so-called Meservey-Tedrow technique. In the present work we suggest that the out-of-plane spin component can be determined by spin Hall effect tunneling spectroscopy. We derive an analytical formula that allows to extract the out-of-plane spin component from spin Hall effect tunneling spectra. We test our formula using realistic tight-binding models of Bi$_2$Se$_3$ and Sb$_2$Te$_3$. We demonstrate that the extracted out-of-plane spin polarization is in very good agreement with the actual out-of-plane spin polarization.
Supplementary Figures 1 and 2 from Identification of a PGXPP degron motif in dishevelled and structural basis for its binding to the E3 ligase KLHL12
Creators: name: Zhuoyao Chen
name: Wasney, Gregory A.
name: Picaud, Sarah
name: Filippakopoulos, Panagis
name: Vedadi, Masoud
name: D'Angiolella, Vincenzo
name: Bullock, Alex N.
Publisher: name: The Royal Society
Year: 2020
Subjects: Structural Biology

description: KLHL12 binding partners may adopt two distinct binding modes
Quantum tomography with $τ$ leptons at the FCC-ee
Creators: name: Fabbrichesi, M.
name: Marzola, L.
Publisher: name: arXiv
Year: 2024
Subjects: subject: High Energy Physics - Phenomenology (hep-ph)
subject: High Energy Physics - Experiment (hep-ex)
subject: Quantum Physics (quant-ph)
subject: FOS: Physical sciences

description: The Future Circular Collider (FCC) -- in its first incarnation as a lepton collider -- will produce, according to the proposed design, more than 100 billion pairs of $τ$ leptons after working for four years at the energy of the $Z$-boson resonance. The $τ$ lepton is special because its relatively long lifetime makes it possible to reconstruct the momenta of neutrinos emitted in the single pion decay mode. The resulting large number of events is an ideal source for a full quantum tomography of the process that will test quantum entanglement and the violation of Bell inequality with unprecedented precision. In addition, the study of polarizations and spin correlations can provide a competitive determination of the Weinberg angle $ θ_W$ and constrain possible anomalous couplings in the neutral electroweak current. We utilize analytic results and Monte Carlo simulations to explore to what extent these goals might be accomplished.
description: 21 pages; matches the published version
From orthocomplementations to locality
Creators: name: Clavier, Pierre
name: Guo, Li
name: Paycha, Sylvie
name: Zhang, Bin
Publisher: name: arXiv
Year: 2020
Subjects: subject: Rings and Algebras (math.RA)
subject: FOS: Mathematics
subject: 06C15, 08A55, 81T15, 15A63

description: After some background on lattices, the locality framework introduced in earlier work by the authors is extended to cover posets and lattices. We then extend the correspondence between Euclidean structures on vector spaces and orthogonal complementations to a one-one correspondence between a class of locality structures and orthocomplementations on bounded lattices. This recasts in the context of renormalisation classical results in lattice theory.
description: 22 pages, 2 figures. Matches the version published in the special issue of SIGMA in honour of Giovanni Landi
Ultrasound image and 3D finite element based tissue deformation simulator for prostate brachytherapy
Creators: name: Goksel, Orcun
Publisher: name: University of British Columbia
Year: 2009

description: Brachytherapy is a prostate cancer treatment where radioactive pellets (seeds) are implanted into prostate region through long flexible needles. Steering them to preplanned locations require the use of tip bevel deflection effect and a thorough comprehension of tissue deformation and needle flexibility. A simulator is proposed to help medical residents in acquiring these procedural skills. In prostate brachytherapy, two important feedback modalities during needle insertions are the transrectal ultrasound (TRUS) imaging and the kinesthetic feedback received through the needle base. Thus, these have been incorporated in the simulator, the subsystems of which are presented here. In this thesis, a needle-tissue interaction model from prior work which was based on finite element method is extended into 3D and adapted for custom meshes. The issues related to needle-tissue coupling are addressed. A meshing scheme which generates soft tissue models with small number of nodes for haptic implementation from contours on parallel slices is proposed. It is utilized to generate a prostate volume mesh which consists of well-conditioned elements for finite element analysis. A simulation interface is developed where a 3D rendering of the model deformation is displayed while the needle can be manipulated by entering target positions for its base. A method for B-mode TRUS image synthesis out of a deformed tissue volume for which the patient data was collected at the BC Cancer Agency is also presented. Some interpolation schemes for remotely spaced ultrasound data are compared on a sample case and a method for overlaying needle shaft reflection onto TRUS images is described.
Technology and Productivity: A Summary of the Relationship and a Review of Relevant Research
Creators: name: Emter, Nicholas A.
name: Emter, Nicholas A.
Publisher: name: Unknown
Year: 2010
Subjects: subject: Labor and Human Capital
subject: Production Economics
subject: Productivity Analysis
subject: Productivity
subject: Technology
subject: Standard of Living
subject: TFP
subject: labour productivity
subject: economic growth
subject: prosperity
subject: adoption

description: This information bulletin is presented in two sections, which follow a summary of the key findings. The first section addresses the important contribution of productivity to economic growth and explores the relationship between adopting advanced technology and improving productivity. Drawing from the findings of productivity research, the section begins by defining productivity and explains why labour factor productivity is the best measure of, and the key to, productivity enhancement. It then explains how increasing productivity leads to economic growth and a higher standard of living. The section concludes by examining the relationship between adopting advanced technologies and productivity enhancement as shown through a review of relevant research papers. The second section summarizes the individual findings from 16 research papers, which explore the relationship between adopting advanced technologies and enhancing productivity. The Western Centre for Economic Research gratefully acknowledges the support provided by Productivity Alberta for this research bulletin.
Graviton physics: Quantum field theory of gravitons, graviton noise and gravitational decoherence -- a concise tutorial
Creators: name: Hsiang, Jen-Tsung
name: Cho, Hing-Tong
name: Hu, Bei-Lok
Publisher: name: arXiv
Year: 2024
Subjects: subject: High Energy Physics - Theory (hep-th)
subject: General Relativity and Quantum Cosmology (gr-qc)
subject: Quantum Physics (quant-ph)
subject: FOS: Physical sciences

description: The detection of gravitational waves in 2015 ushered in a new era of gravitational wave astronomy capable of probing into the strong field dynamics of black holes and neutron stars. It has opened up an exciting new window for laboratory and space tests of Einstein's theory of classical general relativity. In recent years there are two interesting proposals aimed at revealing the quantum natures of perturbative gravity: 1) theoretical predictions in how graviton noise from the early universe after the vacuum of the gravitational field was strongly squeezed by inflationary expansion; 2) experimental proposals using the quantum entanglement between two masses each in a superposition state. The first proposal invokes the stochastic properties of quantum fields, the second invokes a key concept of quantum information. An equally basic and interesting idea is to ask whether and how gravity might be responsible for a quantum system becoming classical in appearance, known as gravitational decoherence. Decoherence due to gravity is of special interest because gravity is universal. This is an important issue in macroscopic quantum phenomena. To fully appreciate these exciting developments requires a working knowledge in classical GR, QF theory and QI plus some familiarity with stochastic processes, namely, noise in quantum fields. Traditionally a new researcher may be conversant in one or two of these four subjects: GR, QFT, QI, SP, depending on his/her background. This tutorial attempts to provide the necessary connections between them, helping an engaging reader from any one of these four subjects to leapfrog to the frontier of these interdisciplinary research topics. Here we shall treat the three topics listed in the title, save gravitational entanglement, because its nature and implications proclaimed in relation to quantum gravity still contain many controversial elements.
description: 54 pages, 2 figures
Scaling up HIV/AIDS intervention through expanded partnerships (STEPs) in Malawi
Creators: name: Kadiyala, Suneetha
name: Kadiyala, Suneetha
Publisher: name: Unknown
Year: 2004
Subjects: subject: Health Economics and Policy
subject: Capacity strengthening
subject: HIV/AIDS
subject: Collective action
subject: Community organizations
subject: Community mobilization
subject: Scaling up
subject: Community-driven development (CDD)
subject: Civil society
subject: Government Policy
subject: Africa

description: This paper discusses enabling and constraining factors related to the scaling-up of the Scaling Up HIV/AIDS Interventions Through Expanded Partnerships (STEPs) initiative, supported by Save the Children U.S.A. (SC), to combat HIV/AIDS in Malawi. It also discusses potential threats to and contextual factors limiting scaling up of STEPs. The report draws primarily upon the available literature and qualitative data collected during a five-day visit to SC Malawi in December 2002. STEPs started in 1995 as Community-Based Options for Protection and Empowerment (COPE). COPE was a service-delivery program in Mangochi District to assist children affected by HIV/AIDS. Through evaluations, SC realized that such an approach was unsustainable, not cost-effective, and not scalable. Based on the recommendations of the evaluations and on field experience, the program changed course to mobilize collective action to combat the epidemic. Working in the Namwera community in Mangochi under the National AIDS Commission (NAC), STEPs revitalized the dormant decentralized AIDS committees and their technical subcommittees at the district, community, and village levels. Based on the positive experience in Namwera, the program changed its initial strategy to that of an external change agent, assisting communities with community mobilization and capacity building so that communities became empowered to act collectively to address their problems. Village AIDS committees (VACs) first identify the vulnerable. Then VACs plan responses on the basis of the nature and magnitude of vulnerability within the villages, needs of the vulnerable, and capacity within villages to respond. The committees also monitor activities and mobilize resources. As the needs of the most affected communities are crosscutting, the program has become truly multisectoral, with activities along the continuum of prevention, care, support, and mitigation. STEPs has also been influencing national policies related to HIV/AIDS and children.
description: Includes bibliographical references.